commit af2fa14087e33717a9eb6e10199e5963cde84e4f
parent 9250327598c99e9f849df3a29c95324340e5bb2d
Author: William Casarin <jb55@jb55.com>
Date: Fri, 3 Aug 2018 13:19:13 -0700
nanovg: init
Diffstat:
8 files changed, 17028 insertions(+), 0 deletions(-)
diff --git a/deps/nanovg/LICENSE.txt b/deps/nanovg/LICENSE.txt
@@ -0,0 +1,18 @@
+Copyright (c) 2013 Mikko Mononen memon@inside.org
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+claim that you wrote the original software. If you use this software
+in a product, an acknowledgment in the product documentation would be
+appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+
diff --git a/deps/nanovg/fontstash.h b/deps/nanovg/fontstash.h
@@ -0,0 +1,1753 @@
+//
+// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would be
+// appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+// misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#ifndef FONS_H
+#define FONS_H
+
+#define FONS_INVALID -1
+
+enum FONSflags {
+ FONS_ZERO_TOPLEFT = 1,
+ FONS_ZERO_BOTTOMLEFT = 2,
+};
+
+enum FONSalign {
+ // Horizontal align
+ FONS_ALIGN_LEFT = 1<<0, // Default
+ FONS_ALIGN_CENTER = 1<<1,
+ FONS_ALIGN_RIGHT = 1<<2,
+ // Vertical align
+ FONS_ALIGN_TOP = 1<<3,
+ FONS_ALIGN_MIDDLE = 1<<4,
+ FONS_ALIGN_BOTTOM = 1<<5,
+ FONS_ALIGN_BASELINE = 1<<6, // Default
+};
+
+enum FONSglyphBitmap {
+ FONS_GLYPH_BITMAP_OPTIONAL = 1,
+ FONS_GLYPH_BITMAP_REQUIRED = 2,
+};
+
+enum FONSerrorCode {
+ // Font atlas is full.
+ FONS_ATLAS_FULL = 1,
+ // Scratch memory used to render glyphs is full, requested size reported in 'val', you may need to bump up FONS_SCRATCH_BUF_SIZE.
+ FONS_SCRATCH_FULL = 2,
+ // Calls to fonsPushState has created too large stack, if you need deep state stack bump up FONS_MAX_STATES.
+ FONS_STATES_OVERFLOW = 3,
+ // Trying to pop too many states fonsPopState().
+ FONS_STATES_UNDERFLOW = 4,
+};
+
+struct FONSparams {
+ int width, height;
+ unsigned char flags;
+ void* userPtr;
+ int (*renderCreate)(void* uptr, int width, int height);
+ int (*renderResize)(void* uptr, int width, int height);
+ void (*renderUpdate)(void* uptr, int* rect, const unsigned char* data);
+ void (*renderDraw)(void* uptr, const float* verts, const float* tcoords, const unsigned int* colors, int nverts);
+ void (*renderDelete)(void* uptr);
+};
+typedef struct FONSparams FONSparams;
+
+struct FONSquad
+{
+ float x0,y0,s0,t0;
+ float x1,y1,s1,t1;
+};
+typedef struct FONSquad FONSquad;
+
+struct FONStextIter {
+ float x, y, nextx, nexty, scale, spacing;
+ unsigned int codepoint;
+ short isize, iblur;
+ struct FONSfont* font;
+ int prevGlyphIndex;
+ const char* str;
+ const char* next;
+ const char* end;
+ unsigned int utf8state;
+ int bitmapOption;
+};
+typedef struct FONStextIter FONStextIter;
+
+typedef struct FONScontext FONScontext;
+
+// Constructor and destructor.
+FONScontext* fonsCreateInternal(FONSparams* params);
+void fonsDeleteInternal(FONScontext* s);
+
+void fonsSetErrorCallback(FONScontext* s, void (*callback)(void* uptr, int error, int val), void* uptr);
+// Returns current atlas size.
+void fonsGetAtlasSize(FONScontext* s, int* width, int* height);
+// Expands the atlas size.
+int fonsExpandAtlas(FONScontext* s, int width, int height);
+// Resets the whole stash.
+int fonsResetAtlas(FONScontext* stash, int width, int height);
+
+// Add fonts
+int fonsAddFont(FONScontext* s, const char* name, const char* path);
+int fonsAddFontMem(FONScontext* s, const char* name, unsigned char* data, int ndata, int freeData);
+int fonsGetFontByName(FONScontext* s, const char* name);
+
+// State handling
+void fonsPushState(FONScontext* s);
+void fonsPopState(FONScontext* s);
+void fonsClearState(FONScontext* s);
+
+// State setting
+void fonsSetSize(FONScontext* s, float size);
+void fonsSetColor(FONScontext* s, unsigned int color);
+void fonsSetSpacing(FONScontext* s, float spacing);
+void fonsSetBlur(FONScontext* s, float blur);
+void fonsSetAlign(FONScontext* s, int align);
+void fonsSetFont(FONScontext* s, int font);
+
+// Draw text
+float fonsDrawText(FONScontext* s, float x, float y, const char* string, const char* end);
+
+// Measure text
+float fonsTextBounds(FONScontext* s, float x, float y, const char* string, const char* end, float* bounds);
+void fonsLineBounds(FONScontext* s, float y, float* miny, float* maxy);
+void fonsVertMetrics(FONScontext* s, float* ascender, float* descender, float* lineh);
+
+// Text iterator
+int fonsTextIterInit(FONScontext* stash, FONStextIter* iter, float x, float y, const char* str, const char* end, int bitmapOption);
+int fonsTextIterNext(FONScontext* stash, FONStextIter* iter, struct FONSquad* quad);
+
+// Pull texture changes
+const unsigned char* fonsGetTextureData(FONScontext* stash, int* width, int* height);
+int fonsValidateTexture(FONScontext* s, int* dirty);
+
+// Draws the stash texture for debugging
+void fonsDrawDebug(FONScontext* s, float x, float y);
+
+#endif // FONTSTASH_H
+
+
+#ifdef FONTSTASH_IMPLEMENTATION
+
+#define FONS_NOTUSED(v) (void)sizeof(v)
+
+#ifdef FONS_USE_FREETYPE
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_ADVANCES_H
+#include <math.h>
+
+struct FONSttFontImpl {
+ FT_Face font;
+};
+typedef struct FONSttFontImpl FONSttFontImpl;
+
+static FT_Library ftLibrary;
+
+int fons__tt_init(FONScontext *context)
+{
+ FT_Error ftError;
+ FONS_NOTUSED(context);
+ ftError = FT_Init_FreeType(&ftLibrary);
+ return ftError == 0;
+}
+
+int fons__tt_loadFont(FONScontext *context, FONSttFontImpl *font, unsigned char *data, int dataSize)
+{
+ FT_Error ftError;
+ FONS_NOTUSED(context);
+
+ //font->font.userdata = stash;
+ ftError = FT_New_Memory_Face(ftLibrary, (const FT_Byte*)data, dataSize, 0, &font->font);
+ return ftError == 0;
+}
+
+void fons__tt_getFontVMetrics(FONSttFontImpl *font, int *ascent, int *descent, int *lineGap)
+{
+ *ascent = font->font->ascender;
+ *descent = font->font->descender;
+ *lineGap = font->font->height - (*ascent - *descent);
+}
+
+float fons__tt_getPixelHeightScale(FONSttFontImpl *font, float size)
+{
+ return size / (font->font->ascender - font->font->descender);
+}
+
+int fons__tt_getGlyphIndex(FONSttFontImpl *font, int codepoint)
+{
+ return FT_Get_Char_Index(font->font, codepoint);
+}
+
+int fons__tt_buildGlyphBitmap(FONSttFontImpl *font, int glyph, float size, float scale,
+ int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1)
+{
+ FT_Error ftError;
+ FT_GlyphSlot ftGlyph;
+ FT_Fixed advFixed;
+ FONS_NOTUSED(scale);
+
+ ftError = FT_Set_Pixel_Sizes(font->font, 0, (FT_UInt)(size * (float)font->font->units_per_EM / (float)(font->font->ascender - font->font->descender)));
+ if (ftError) return 0;
+ ftError = FT_Load_Glyph(font->font, glyph, FT_LOAD_RENDER);
+ if (ftError) return 0;
+ ftError = FT_Get_Advance(font->font, glyph, FT_LOAD_NO_SCALE, &advFixed);
+ if (ftError) return 0;
+ ftGlyph = font->font->glyph;
+ *advance = (int)advFixed;
+ *lsb = (int)ftGlyph->metrics.horiBearingX;
+ *x0 = ftGlyph->bitmap_left;
+ *x1 = *x0 + ftGlyph->bitmap.width;
+ *y0 = -ftGlyph->bitmap_top;
+ *y1 = *y0 + ftGlyph->bitmap.rows;
+ return 1;
+}
+
+void fons__tt_renderGlyphBitmap(FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride,
+ float scaleX, float scaleY, int glyph)
+{
+ FT_GlyphSlot ftGlyph = font->font->glyph;
+ int ftGlyphOffset = 0;
+ int x, y;
+ FONS_NOTUSED(outWidth);
+ FONS_NOTUSED(outHeight);
+ FONS_NOTUSED(scaleX);
+ FONS_NOTUSED(scaleY);
+ FONS_NOTUSED(glyph); // glyph has already been loaded by fons__tt_buildGlyphBitmap
+
+ for ( y = 0; y < ftGlyph->bitmap.rows; y++ ) {
+ for ( x = 0; x < ftGlyph->bitmap.width; x++ ) {
+ output[(y * outStride) + x] = ftGlyph->bitmap.buffer[ftGlyphOffset++];
+ }
+ }
+}
+
+int fons__tt_getGlyphKernAdvance(FONSttFontImpl *font, int glyph1, int glyph2)
+{
+ FT_Vector ftKerning;
+ FT_Get_Kerning(font->font, glyph1, glyph2, FT_KERNING_DEFAULT, &ftKerning);
+ return (int)((ftKerning.x + 32) >> 6); // Round up and convert to integer
+}
+
+#else
+
+#define STB_TRUETYPE_IMPLEMENTATION
+static void* fons__tmpalloc(size_t size, void* up);
+static void fons__tmpfree(void* ptr, void* up);
+#define STBTT_malloc(x,u) fons__tmpalloc(x,u)
+#define STBTT_free(x,u) fons__tmpfree(x,u)
+#include "stb_truetype.h"
+
+struct FONSttFontImpl {
+ stbtt_fontinfo font;
+};
+typedef struct FONSttFontImpl FONSttFontImpl;
+
+int fons__tt_init(FONScontext *context)
+{
+ FONS_NOTUSED(context);
+ return 1;
+}
+
+int fons__tt_loadFont(FONScontext *context, FONSttFontImpl *font, unsigned char *data, int dataSize)
+{
+ int stbError;
+ FONS_NOTUSED(dataSize);
+
+ font->font.userdata = context;
+ stbError = stbtt_InitFont(&font->font, data, 0);
+ return stbError;
+}
+
+void fons__tt_getFontVMetrics(FONSttFontImpl *font, int *ascent, int *descent, int *lineGap)
+{
+ stbtt_GetFontVMetrics(&font->font, ascent, descent, lineGap);
+}
+
+float fons__tt_getPixelHeightScale(FONSttFontImpl *font, float size)
+{
+ return stbtt_ScaleForPixelHeight(&font->font, size);
+}
+
+int fons__tt_getGlyphIndex(FONSttFontImpl *font, int codepoint)
+{
+ return stbtt_FindGlyphIndex(&font->font, codepoint);
+}
+
+int fons__tt_buildGlyphBitmap(FONSttFontImpl *font, int glyph, float size, float scale,
+ int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1)
+{
+ FONS_NOTUSED(size);
+ stbtt_GetGlyphHMetrics(&font->font, glyph, advance, lsb);
+ stbtt_GetGlyphBitmapBox(&font->font, glyph, scale, scale, x0, y0, x1, y1);
+ return 1;
+}
+
+void fons__tt_renderGlyphBitmap(FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride,
+ float scaleX, float scaleY, int glyph)
+{
+ stbtt_MakeGlyphBitmap(&font->font, output, outWidth, outHeight, outStride, scaleX, scaleY, glyph);
+}
+
+int fons__tt_getGlyphKernAdvance(FONSttFontImpl *font, int glyph1, int glyph2)
+{
+ return stbtt_GetGlyphKernAdvance(&font->font, glyph1, glyph2);
+}
+
+#endif
+
+#ifndef FONS_SCRATCH_BUF_SIZE
+# define FONS_SCRATCH_BUF_SIZE 64000
+#endif
+#ifndef FONS_HASH_LUT_SIZE
+# define FONS_HASH_LUT_SIZE 256
+#endif
+#ifndef FONS_INIT_FONTS
+# define FONS_INIT_FONTS 4
+#endif
+#ifndef FONS_INIT_GLYPHS
+# define FONS_INIT_GLYPHS 256
+#endif
+#ifndef FONS_INIT_ATLAS_NODES
+# define FONS_INIT_ATLAS_NODES 256
+#endif
+#ifndef FONS_VERTEX_COUNT
+# define FONS_VERTEX_COUNT 1024
+#endif
+#ifndef FONS_MAX_STATES
+# define FONS_MAX_STATES 20
+#endif
+#ifndef FONS_MAX_FALLBACKS
+# define FONS_MAX_FALLBACKS 20
+#endif
+
+static unsigned int fons__hashint(unsigned int a)
+{
+ a += ~(a<<15);
+ a ^= (a>>10);
+ a += (a<<3);
+ a ^= (a>>6);
+ a += ~(a<<11);
+ a ^= (a>>16);
+ return a;
+}
+
+static int fons__mini(int a, int b)
+{
+ return a < b ? a : b;
+}
+
+static int fons__maxi(int a, int b)
+{
+ return a > b ? a : b;
+}
+
+struct FONSglyph
+{
+ unsigned int codepoint;
+ int index;
+ int next;
+ short size, blur;
+ short x0,y0,x1,y1;
+ short xadv,xoff,yoff;
+};
+typedef struct FONSglyph FONSglyph;
+
+struct FONSfont
+{
+ FONSttFontImpl font;
+ char name[64];
+ unsigned char* data;
+ int dataSize;
+ unsigned char freeData;
+ float ascender;
+ float descender;
+ float lineh;
+ FONSglyph* glyphs;
+ int cglyphs;
+ int nglyphs;
+ int lut[FONS_HASH_LUT_SIZE];
+ int fallbacks[FONS_MAX_FALLBACKS];
+ int nfallbacks;
+};
+typedef struct FONSfont FONSfont;
+
+struct FONSstate
+{
+ int font;
+ int align;
+ float size;
+ unsigned int color;
+ float blur;
+ float spacing;
+};
+typedef struct FONSstate FONSstate;
+
+struct FONSatlasNode {
+ short x, y, width;
+};
+typedef struct FONSatlasNode FONSatlasNode;
+
+struct FONSatlas
+{
+ int width, height;
+ FONSatlasNode* nodes;
+ int nnodes;
+ int cnodes;
+};
+typedef struct FONSatlas FONSatlas;
+
+struct FONScontext
+{
+ FONSparams params;
+ float itw,ith;
+ unsigned char* texData;
+ int dirtyRect[4];
+ FONSfont** fonts;
+ FONSatlas* atlas;
+ int cfonts;
+ int nfonts;
+ float verts[FONS_VERTEX_COUNT*2];
+ float tcoords[FONS_VERTEX_COUNT*2];
+ unsigned int colors[FONS_VERTEX_COUNT];
+ int nverts;
+ unsigned char* scratch;
+ int nscratch;
+ FONSstate states[FONS_MAX_STATES];
+ int nstates;
+ void (*handleError)(void* uptr, int error, int val);
+ void* errorUptr;
+};
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+
+static void* fons__tmpalloc(size_t size, void* up)
+{
+ unsigned char* ptr;
+ FONScontext* stash = (FONScontext*)up;
+
+ // 16-byte align the returned pointer
+ size = (size + 0xf) & ~0xf;
+
+ if (stash->nscratch+(int)size > FONS_SCRATCH_BUF_SIZE) {
+ if (stash->handleError)
+ stash->handleError(stash->errorUptr, FONS_SCRATCH_FULL, stash->nscratch+(int)size);
+ return NULL;
+ }
+ ptr = stash->scratch + stash->nscratch;
+ stash->nscratch += (int)size;
+ return ptr;
+}
+
+static void fons__tmpfree(void* ptr, void* up)
+{
+ (void)ptr;
+ (void)up;
+ // empty
+}
+
+#endif // STB_TRUETYPE_IMPLEMENTATION
+
+// Copyright (c) 2008-2010 Bjoern Hoehrmann <bjoern@hoehrmann.de>
+// See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
+
+#define FONS_UTF8_ACCEPT 0
+#define FONS_UTF8_REJECT 12
+
+static unsigned int fons__decutf8(unsigned int* state, unsigned int* codep, unsigned int byte)
+{
+ static const unsigned char utf8d[] = {
+ // The first part of the table maps bytes to character classes that
+ // to reduce the size of the transition table and create bitmasks.
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+ 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+ 8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+ 10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8,
+
+ // The second part is a transition table that maps a combination
+ // of a state of the automaton and a character class to a state.
+ 0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
+ 12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
+ 12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
+ 12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
+ 12,36,12,12,12,12,12,12,12,12,12,12,
+ };
+
+ unsigned int type = utf8d[byte];
+
+ *codep = (*state != FONS_UTF8_ACCEPT) ?
+ (byte & 0x3fu) | (*codep << 6) :
+ (0xff >> type) & (byte);
+
+ *state = utf8d[256 + *state + type];
+ return *state;
+}
+
+// Atlas based on Skyline Bin Packer by Jukka Jylänki
+
+static void fons__deleteAtlas(FONSatlas* atlas)
+{
+ if (atlas == NULL) return;
+ if (atlas->nodes != NULL) free(atlas->nodes);
+ free(atlas);
+}
+
+static FONSatlas* fons__allocAtlas(int w, int h, int nnodes)
+{
+ FONSatlas* atlas = NULL;
+
+ // Allocate memory for the font stash.
+ atlas = (FONSatlas*)malloc(sizeof(FONSatlas));
+ if (atlas == NULL) goto error;
+ memset(atlas, 0, sizeof(FONSatlas));
+
+ atlas->width = w;
+ atlas->height = h;
+
+ // Allocate space for skyline nodes
+ atlas->nodes = (FONSatlasNode*)malloc(sizeof(FONSatlasNode) * nnodes);
+ if (atlas->nodes == NULL) goto error;
+ memset(atlas->nodes, 0, sizeof(FONSatlasNode) * nnodes);
+ atlas->nnodes = 0;
+ atlas->cnodes = nnodes;
+
+ // Init root node.
+ atlas->nodes[0].x = 0;
+ atlas->nodes[0].y = 0;
+ atlas->nodes[0].width = (short)w;
+ atlas->nnodes++;
+
+ return atlas;
+
+error:
+ if (atlas) fons__deleteAtlas(atlas);
+ return NULL;
+}
+
+static int fons__atlasInsertNode(FONSatlas* atlas, int idx, int x, int y, int w)
+{
+ int i;
+ // Insert node
+ if (atlas->nnodes+1 > atlas->cnodes) {
+ atlas->cnodes = atlas->cnodes == 0 ? 8 : atlas->cnodes * 2;
+ atlas->nodes = (FONSatlasNode*)realloc(atlas->nodes, sizeof(FONSatlasNode) * atlas->cnodes);
+ if (atlas->nodes == NULL)
+ return 0;
+ }
+ for (i = atlas->nnodes; i > idx; i--)
+ atlas->nodes[i] = atlas->nodes[i-1];
+ atlas->nodes[idx].x = (short)x;
+ atlas->nodes[idx].y = (short)y;
+ atlas->nodes[idx].width = (short)w;
+ atlas->nnodes++;
+
+ return 1;
+}
+
+static void fons__atlasRemoveNode(FONSatlas* atlas, int idx)
+{
+ int i;
+ if (atlas->nnodes == 0) return;
+ for (i = idx; i < atlas->nnodes-1; i++)
+ atlas->nodes[i] = atlas->nodes[i+1];
+ atlas->nnodes--;
+}
+
+static void fons__atlasExpand(FONSatlas* atlas, int w, int h)
+{
+ // Insert node for empty space
+ if (w > atlas->width)
+ fons__atlasInsertNode(atlas, atlas->nnodes, atlas->width, 0, w - atlas->width);
+ atlas->width = w;
+ atlas->height = h;
+}
+
+static void fons__atlasReset(FONSatlas* atlas, int w, int h)
+{
+ atlas->width = w;
+ atlas->height = h;
+ atlas->nnodes = 0;
+
+ // Init root node.
+ atlas->nodes[0].x = 0;
+ atlas->nodes[0].y = 0;
+ atlas->nodes[0].width = (short)w;
+ atlas->nnodes++;
+}
+
+static int fons__atlasAddSkylineLevel(FONSatlas* atlas, int idx, int x, int y, int w, int h)
+{
+ int i;
+
+ // Insert new node
+ if (fons__atlasInsertNode(atlas, idx, x, y+h, w) == 0)
+ return 0;
+
+ // Delete skyline segments that fall under the shadow of the new segment.
+ for (i = idx+1; i < atlas->nnodes; i++) {
+ if (atlas->nodes[i].x < atlas->nodes[i-1].x + atlas->nodes[i-1].width) {
+ int shrink = atlas->nodes[i-1].x + atlas->nodes[i-1].width - atlas->nodes[i].x;
+ atlas->nodes[i].x += (short)shrink;
+ atlas->nodes[i].width -= (short)shrink;
+ if (atlas->nodes[i].width <= 0) {
+ fons__atlasRemoveNode(atlas, i);
+ i--;
+ } else {
+ break;
+ }
+ } else {
+ break;
+ }
+ }
+
+ // Merge same height skyline segments that are next to each other.
+ for (i = 0; i < atlas->nnodes-1; i++) {
+ if (atlas->nodes[i].y == atlas->nodes[i+1].y) {
+ atlas->nodes[i].width += atlas->nodes[i+1].width;
+ fons__atlasRemoveNode(atlas, i+1);
+ i--;
+ }
+ }
+
+ return 1;
+}
+
+static int fons__atlasRectFits(FONSatlas* atlas, int i, int w, int h)
+{
+ // Checks if there is enough space at the location of skyline span 'i',
+ // and return the max height of all skyline spans under that at that location,
+ // (think tetris block being dropped at that position). Or -1 if no space found.
+ int x = atlas->nodes[i].x;
+ int y = atlas->nodes[i].y;
+ int spaceLeft;
+ if (x + w > atlas->width)
+ return -1;
+ spaceLeft = w;
+ while (spaceLeft > 0) {
+ if (i == atlas->nnodes) return -1;
+ y = fons__maxi(y, atlas->nodes[i].y);
+ if (y + h > atlas->height) return -1;
+ spaceLeft -= atlas->nodes[i].width;
+ ++i;
+ }
+ return y;
+}
+
+static int fons__atlasAddRect(FONSatlas* atlas, int rw, int rh, int* rx, int* ry)
+{
+ int besth = atlas->height, bestw = atlas->width, besti = -1;
+ int bestx = -1, besty = -1, i;
+
+ // Bottom left fit heuristic.
+ for (i = 0; i < atlas->nnodes; i++) {
+ int y = fons__atlasRectFits(atlas, i, rw, rh);
+ if (y != -1) {
+ if (y + rh < besth || (y + rh == besth && atlas->nodes[i].width < bestw)) {
+ besti = i;
+ bestw = atlas->nodes[i].width;
+ besth = y + rh;
+ bestx = atlas->nodes[i].x;
+ besty = y;
+ }
+ }
+ }
+
+ if (besti == -1)
+ return 0;
+
+ // Perform the actual packing.
+ if (fons__atlasAddSkylineLevel(atlas, besti, bestx, besty, rw, rh) == 0)
+ return 0;
+
+ *rx = bestx;
+ *ry = besty;
+
+ return 1;
+}
+
+static void fons__addWhiteRect(FONScontext* stash, int w, int h)
+{
+ int x, y, gx, gy;
+ unsigned char* dst;
+ if (fons__atlasAddRect(stash->atlas, w, h, &gx, &gy) == 0)
+ return;
+
+ // Rasterize
+ dst = &stash->texData[gx + gy * stash->params.width];
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++)
+ dst[x] = 0xff;
+ dst += stash->params.width;
+ }
+
+ stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], gx);
+ stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], gy);
+ stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], gx+w);
+ stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], gy+h);
+}
+
+FONScontext* fonsCreateInternal(FONSparams* params)
+{
+ FONScontext* stash = NULL;
+
+ // Allocate memory for the font stash.
+ stash = (FONScontext*)malloc(sizeof(FONScontext));
+ if (stash == NULL) goto error;
+ memset(stash, 0, sizeof(FONScontext));
+
+ stash->params = *params;
+
+ // Allocate scratch buffer.
+ stash->scratch = (unsigned char*)malloc(FONS_SCRATCH_BUF_SIZE);
+ if (stash->scratch == NULL) goto error;
+
+ // Initialize implementation library
+ if (!fons__tt_init(stash)) goto error;
+
+ if (stash->params.renderCreate != NULL) {
+ if (stash->params.renderCreate(stash->params.userPtr, stash->params.width, stash->params.height) == 0)
+ goto error;
+ }
+
+ stash->atlas = fons__allocAtlas(stash->params.width, stash->params.height, FONS_INIT_ATLAS_NODES);
+ if (stash->atlas == NULL) goto error;
+
+ // Allocate space for fonts.
+ stash->fonts = (FONSfont**)malloc(sizeof(FONSfont*) * FONS_INIT_FONTS);
+ if (stash->fonts == NULL) goto error;
+ memset(stash->fonts, 0, sizeof(FONSfont*) * FONS_INIT_FONTS);
+ stash->cfonts = FONS_INIT_FONTS;
+ stash->nfonts = 0;
+
+ // Create texture for the cache.
+ stash->itw = 1.0f/stash->params.width;
+ stash->ith = 1.0f/stash->params.height;
+ stash->texData = (unsigned char*)malloc(stash->params.width * stash->params.height);
+ if (stash->texData == NULL) goto error;
+ memset(stash->texData, 0, stash->params.width * stash->params.height);
+
+ stash->dirtyRect[0] = stash->params.width;
+ stash->dirtyRect[1] = stash->params.height;
+ stash->dirtyRect[2] = 0;
+ stash->dirtyRect[3] = 0;
+
+ // Add white rect at 0,0 for debug drawing.
+ fons__addWhiteRect(stash, 2,2);
+
+ fonsPushState(stash);
+ fonsClearState(stash);
+
+ return stash;
+
+error:
+ fonsDeleteInternal(stash);
+ return NULL;
+}
+
+static FONSstate* fons__getState(FONScontext* stash)
+{
+ return &stash->states[stash->nstates-1];
+}
+
+int fonsAddFallbackFont(FONScontext* stash, int base, int fallback)
+{
+ FONSfont* baseFont = stash->fonts[base];
+ if (baseFont->nfallbacks < FONS_MAX_FALLBACKS) {
+ baseFont->fallbacks[baseFont->nfallbacks++] = fallback;
+ return 1;
+ }
+ return 0;
+}
+
+void fonsSetSize(FONScontext* stash, float size)
+{
+ fons__getState(stash)->size = size;
+}
+
+void fonsSetColor(FONScontext* stash, unsigned int color)
+{
+ fons__getState(stash)->color = color;
+}
+
+void fonsSetSpacing(FONScontext* stash, float spacing)
+{
+ fons__getState(stash)->spacing = spacing;
+}
+
+void fonsSetBlur(FONScontext* stash, float blur)
+{
+ fons__getState(stash)->blur = blur;
+}
+
+void fonsSetAlign(FONScontext* stash, int align)
+{
+ fons__getState(stash)->align = align;
+}
+
+void fonsSetFont(FONScontext* stash, int font)
+{
+ fons__getState(stash)->font = font;
+}
+
+void fonsPushState(FONScontext* stash)
+{
+ if (stash->nstates >= FONS_MAX_STATES) {
+ if (stash->handleError)
+ stash->handleError(stash->errorUptr, FONS_STATES_OVERFLOW, 0);
+ return;
+ }
+ if (stash->nstates > 0)
+ memcpy(&stash->states[stash->nstates], &stash->states[stash->nstates-1], sizeof(FONSstate));
+ stash->nstates++;
+}
+
+void fonsPopState(FONScontext* stash)
+{
+ if (stash->nstates <= 1) {
+ if (stash->handleError)
+ stash->handleError(stash->errorUptr, FONS_STATES_UNDERFLOW, 0);
+ return;
+ }
+ stash->nstates--;
+}
+
+void fonsClearState(FONScontext* stash)
+{
+ FONSstate* state = fons__getState(stash);
+ state->size = 12.0f;
+ state->color = 0xffffffff;
+ state->font = 0;
+ state->blur = 0;
+ state->spacing = 0;
+ state->align = FONS_ALIGN_LEFT | FONS_ALIGN_BASELINE;
+}
+
+static void fons__freeFont(FONSfont* font)
+{
+ if (font == NULL) return;
+ if (font->glyphs) free(font->glyphs);
+ if (font->freeData && font->data) free(font->data);
+ free(font);
+}
+
+static int fons__allocFont(FONScontext* stash)
+{
+ FONSfont* font = NULL;
+ if (stash->nfonts+1 > stash->cfonts) {
+ stash->cfonts = stash->cfonts == 0 ? 8 : stash->cfonts * 2;
+ stash->fonts = (FONSfont**)realloc(stash->fonts, sizeof(FONSfont*) * stash->cfonts);
+ if (stash->fonts == NULL)
+ return -1;
+ }
+ font = (FONSfont*)malloc(sizeof(FONSfont));
+ if (font == NULL) goto error;
+ memset(font, 0, sizeof(FONSfont));
+
+ font->glyphs = (FONSglyph*)malloc(sizeof(FONSglyph) * FONS_INIT_GLYPHS);
+ if (font->glyphs == NULL) goto error;
+ font->cglyphs = FONS_INIT_GLYPHS;
+ font->nglyphs = 0;
+
+ stash->fonts[stash->nfonts++] = font;
+ return stash->nfonts-1;
+
+error:
+ fons__freeFont(font);
+
+ return FONS_INVALID;
+}
+
+int fonsAddFont(FONScontext* stash, const char* name, const char* path)
+{
+ FILE* fp = 0;
+ int dataSize = 0;
+ size_t readed;
+ unsigned char* data = NULL;
+
+ // Read in the font data.
+ fp = fopen(path, "rb");
+ if (fp == NULL) goto error;
+ fseek(fp,0,SEEK_END);
+ dataSize = (int)ftell(fp);
+ fseek(fp,0,SEEK_SET);
+ data = (unsigned char*)malloc(dataSize);
+ if (data == NULL) goto error;
+ readed = fread(data, 1, dataSize, fp);
+ fclose(fp);
+ fp = 0;
+ if (readed != dataSize) goto error;
+
+ return fonsAddFontMem(stash, name, data, dataSize, 1);
+
+error:
+ if (data) free(data);
+ if (fp) fclose(fp);
+ return FONS_INVALID;
+}
+
+int fonsAddFontMem(FONScontext* stash, const char* name, unsigned char* data, int dataSize, int freeData)
+{
+ int i, ascent, descent, fh, lineGap;
+ FONSfont* font;
+
+ int idx = fons__allocFont(stash);
+ if (idx == FONS_INVALID)
+ return FONS_INVALID;
+
+ font = stash->fonts[idx];
+
+ strncpy(font->name, name, sizeof(font->name));
+ font->name[sizeof(font->name)-1] = '\0';
+
+ // Init hash lookup.
+ for (i = 0; i < FONS_HASH_LUT_SIZE; ++i)
+ font->lut[i] = -1;
+
+ // Read in the font data.
+ font->dataSize = dataSize;
+ font->data = data;
+ font->freeData = (unsigned char)freeData;
+
+ // Init font
+ stash->nscratch = 0;
+ if (!fons__tt_loadFont(stash, &font->font, data, dataSize)) goto error;
+
+ // Store normalized line height. The real line height is got
+ // by multiplying the lineh by font size.
+ fons__tt_getFontVMetrics( &font->font, &ascent, &descent, &lineGap);
+ fh = ascent - descent;
+ font->ascender = (float)ascent / (float)fh;
+ font->descender = (float)descent / (float)fh;
+ font->lineh = (float)(fh + lineGap) / (float)fh;
+
+ return idx;
+
+error:
+ fons__freeFont(font);
+ stash->nfonts--;
+ return FONS_INVALID;
+}
+
+int fonsGetFontByName(FONScontext* s, const char* name)
+{
+ int i;
+ for (i = 0; i < s->nfonts; i++) {
+ if (strcmp(s->fonts[i]->name, name) == 0)
+ return i;
+ }
+ return FONS_INVALID;
+}
+
+
+static FONSglyph* fons__allocGlyph(FONSfont* font)
+{
+ if (font->nglyphs+1 > font->cglyphs) {
+ font->cglyphs = font->cglyphs == 0 ? 8 : font->cglyphs * 2;
+ font->glyphs = (FONSglyph*)realloc(font->glyphs, sizeof(FONSglyph) * font->cglyphs);
+ if (font->glyphs == NULL) return NULL;
+ }
+ font->nglyphs++;
+ return &font->glyphs[font->nglyphs-1];
+}
+
+
+// Based on Exponential blur, Jani Huhtanen, 2006
+
+#define APREC 16
+#define ZPREC 7
+
+static void fons__blurCols(unsigned char* dst, int w, int h, int dstStride, int alpha)
+{
+ int x, y;
+ for (y = 0; y < h; y++) {
+ int z = 0; // force zero border
+ for (x = 1; x < w; x++) {
+ z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC;
+ dst[x] = (unsigned char)(z >> ZPREC);
+ }
+ dst[w-1] = 0; // force zero border
+ z = 0;
+ for (x = w-2; x >= 0; x--) {
+ z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC;
+ dst[x] = (unsigned char)(z >> ZPREC);
+ }
+ dst[0] = 0; // force zero border
+ dst += dstStride;
+ }
+}
+
+static void fons__blurRows(unsigned char* dst, int w, int h, int dstStride, int alpha)
+{
+ int x, y;
+ for (x = 0; x < w; x++) {
+ int z = 0; // force zero border
+ for (y = dstStride; y < h*dstStride; y += dstStride) {
+ z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC;
+ dst[y] = (unsigned char)(z >> ZPREC);
+ }
+ dst[(h-1)*dstStride] = 0; // force zero border
+ z = 0;
+ for (y = (h-2)*dstStride; y >= 0; y -= dstStride) {
+ z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC;
+ dst[y] = (unsigned char)(z >> ZPREC);
+ }
+ dst[0] = 0; // force zero border
+ dst++;
+ }
+}
+
+
+static void fons__blur(FONScontext* stash, unsigned char* dst, int w, int h, int dstStride, int blur)
+{
+ int alpha;
+ float sigma;
+ (void)stash;
+
+ if (blur < 1)
+ return;
+ // Calculate the alpha such that 90% of the kernel is within the radius. (Kernel extends to infinity)
+ sigma = (float)blur * 0.57735f; // 1 / sqrt(3)
+ alpha = (int)((1<<APREC) * (1.0f - expf(-2.3f / (sigma+1.0f))));
+ fons__blurRows(dst, w, h, dstStride, alpha);
+ fons__blurCols(dst, w, h, dstStride, alpha);
+ fons__blurRows(dst, w, h, dstStride, alpha);
+ fons__blurCols(dst, w, h, dstStride, alpha);
+// fons__blurrows(dst, w, h, dstStride, alpha);
+// fons__blurcols(dst, w, h, dstStride, alpha);
+}
+
+static FONSglyph* fons__getGlyph(FONScontext* stash, FONSfont* font, unsigned int codepoint,
+ short isize, short iblur, int bitmapOption)
+{
+ int i, g, advance, lsb, x0, y0, x1, y1, gw, gh, gx, gy, x, y;
+ float scale;
+ FONSglyph* glyph = NULL;
+ unsigned int h;
+ float size = isize/10.0f;
+ int pad, added;
+ unsigned char* bdst;
+ unsigned char* dst;
+ FONSfont* renderFont = font;
+
+ if (isize < 2) return NULL;
+ if (iblur > 20) iblur = 20;
+ pad = iblur+2;
+
+ // Reset allocator.
+ stash->nscratch = 0;
+
+ // Find code point and size.
+ h = fons__hashint(codepoint) & (FONS_HASH_LUT_SIZE-1);
+ i = font->lut[h];
+ while (i != -1) {
+ if (font->glyphs[i].codepoint == codepoint && font->glyphs[i].size == isize && font->glyphs[i].blur == iblur) {
+ glyph = &font->glyphs[i];
+ if (bitmapOption == FONS_GLYPH_BITMAP_OPTIONAL || (glyph->x0 >= 0 && glyph->y0 >= 0)) {
+ return glyph;
+ }
+ // At this point, glyph exists but the bitmap data is not yet created.
+ break;
+ }
+ i = font->glyphs[i].next;
+ }
+
+ // Create a new glyph or rasterize bitmap data for a cached glyph.
+ g = fons__tt_getGlyphIndex(&font->font, codepoint);
+ // Try to find the glyph in fallback fonts.
+ if (g == 0) {
+ for (i = 0; i < font->nfallbacks; ++i) {
+ FONSfont* fallbackFont = stash->fonts[font->fallbacks[i]];
+ int fallbackIndex = fons__tt_getGlyphIndex(&fallbackFont->font, codepoint);
+ if (fallbackIndex != 0) {
+ g = fallbackIndex;
+ renderFont = fallbackFont;
+ break;
+ }
+ }
+ // It is possible that we did not find a fallback glyph.
+ // In that case the glyph index 'g' is 0, and we'll proceed below and cache empty glyph.
+ }
+ scale = fons__tt_getPixelHeightScale(&renderFont->font, size);
+ fons__tt_buildGlyphBitmap(&renderFont->font, g, size, scale, &advance, &lsb, &x0, &y0, &x1, &y1);
+ gw = x1-x0 + pad*2;
+ gh = y1-y0 + pad*2;
+
+ // Determines the spot to draw glyph in the atlas.
+ if (bitmapOption == FONS_GLYPH_BITMAP_REQUIRED) {
+ // Find free spot for the rect in the atlas
+ added = fons__atlasAddRect(stash->atlas, gw, gh, &gx, &gy);
+ if (added == 0 && stash->handleError != NULL) {
+ // Atlas is full, let the user to resize the atlas (or not), and try again.
+ stash->handleError(stash->errorUptr, FONS_ATLAS_FULL, 0);
+ added = fons__atlasAddRect(stash->atlas, gw, gh, &gx, &gy);
+ }
+ if (added == 0) return NULL;
+ } else {
+ // Negative coordinate indicates there is no bitmap data created.
+ gx = -1;
+ gy = -1;
+ }
+
+ // Init glyph.
+ if (glyph == NULL) {
+ glyph = fons__allocGlyph(font);
+ glyph->codepoint = codepoint;
+ glyph->size = isize;
+ glyph->blur = iblur;
+ glyph->next = 0;
+
+ // Insert char to hash lookup.
+ glyph->next = font->lut[h];
+ font->lut[h] = font->nglyphs-1;
+ }
+ glyph->index = g;
+ glyph->x0 = (short)gx;
+ glyph->y0 = (short)gy;
+ glyph->x1 = (short)(glyph->x0+gw);
+ glyph->y1 = (short)(glyph->y0+gh);
+ glyph->xadv = (short)(scale * advance * 10.0f);
+ glyph->xoff = (short)(x0 - pad);
+ glyph->yoff = (short)(y0 - pad);
+
+ if (bitmapOption == FONS_GLYPH_BITMAP_OPTIONAL) {
+ return glyph;
+ }
+
+ // Rasterize
+ dst = &stash->texData[(glyph->x0+pad) + (glyph->y0+pad) * stash->params.width];
+ fons__tt_renderGlyphBitmap(&renderFont->font, dst, gw-pad*2,gh-pad*2, stash->params.width, scale, scale, g);
+
+ // Make sure there is one pixel empty border.
+ dst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width];
+ for (y = 0; y < gh; y++) {
+ dst[y*stash->params.width] = 0;
+ dst[gw-1 + y*stash->params.width] = 0;
+ }
+ for (x = 0; x < gw; x++) {
+ dst[x] = 0;
+ dst[x + (gh-1)*stash->params.width] = 0;
+ }
+
+ // Debug code to color the glyph background
+/* unsigned char* fdst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width];
+ for (y = 0; y < gh; y++) {
+ for (x = 0; x < gw; x++) {
+ int a = (int)fdst[x+y*stash->params.width] + 20;
+ if (a > 255) a = 255;
+ fdst[x+y*stash->params.width] = a;
+ }
+ }*/
+
+ // Blur
+ if (iblur > 0) {
+ stash->nscratch = 0;
+ bdst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width];
+ fons__blur(stash, bdst, gw, gh, stash->params.width, iblur);
+ }
+
+ stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], glyph->x0);
+ stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], glyph->y0);
+ stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], glyph->x1);
+ stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], glyph->y1);
+
+ return glyph;
+}
+
+static void fons__getQuad(FONScontext* stash, FONSfont* font,
+ int prevGlyphIndex, FONSglyph* glyph,
+ float scale, float spacing, float* x, float* y, FONSquad* q)
+{
+ float rx,ry,xoff,yoff,x0,y0,x1,y1;
+
+ if (prevGlyphIndex != -1) {
+ float adv = fons__tt_getGlyphKernAdvance(&font->font, prevGlyphIndex, glyph->index) * scale;
+ *x += (int)(adv + spacing + 0.5f);
+ }
+
+ // Each glyph has 2px border to allow good interpolation,
+ // one pixel to prevent leaking, and one to allow good interpolation for rendering.
+ // Inset the texture region by one pixel for correct interpolation.
+ xoff = (short)(glyph->xoff+1);
+ yoff = (short)(glyph->yoff+1);
+ x0 = (float)(glyph->x0+1);
+ y0 = (float)(glyph->y0+1);
+ x1 = (float)(glyph->x1-1);
+ y1 = (float)(glyph->y1-1);
+
+ if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+ rx = (float)(int)(*x + xoff);
+ ry = (float)(int)(*y + yoff);
+
+ q->x0 = rx;
+ q->y0 = ry;
+ q->x1 = rx + x1 - x0;
+ q->y1 = ry + y1 - y0;
+
+ q->s0 = x0 * stash->itw;
+ q->t0 = y0 * stash->ith;
+ q->s1 = x1 * stash->itw;
+ q->t1 = y1 * stash->ith;
+ } else {
+ rx = (float)(int)(*x + xoff);
+ ry = (float)(int)(*y - yoff);
+
+ q->x0 = rx;
+ q->y0 = ry;
+ q->x1 = rx + x1 - x0;
+ q->y1 = ry - y1 + y0;
+
+ q->s0 = x0 * stash->itw;
+ q->t0 = y0 * stash->ith;
+ q->s1 = x1 * stash->itw;
+ q->t1 = y1 * stash->ith;
+ }
+
+ *x += (int)(glyph->xadv / 10.0f + 0.5f);
+}
+
+static void fons__flush(FONScontext* stash)
+{
+ // Flush texture
+ if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) {
+ if (stash->params.renderUpdate != NULL)
+ stash->params.renderUpdate(stash->params.userPtr, stash->dirtyRect, stash->texData);
+ // Reset dirty rect
+ stash->dirtyRect[0] = stash->params.width;
+ stash->dirtyRect[1] = stash->params.height;
+ stash->dirtyRect[2] = 0;
+ stash->dirtyRect[3] = 0;
+ }
+
+ // Flush triangles
+ if (stash->nverts > 0) {
+ if (stash->params.renderDraw != NULL)
+ stash->params.renderDraw(stash->params.userPtr, stash->verts, stash->tcoords, stash->colors, stash->nverts);
+ stash->nverts = 0;
+ }
+}
+
+static __inline void fons__vertex(FONScontext* stash, float x, float y, float s, float t, unsigned int c)
+{
+ stash->verts[stash->nverts*2+0] = x;
+ stash->verts[stash->nverts*2+1] = y;
+ stash->tcoords[stash->nverts*2+0] = s;
+ stash->tcoords[stash->nverts*2+1] = t;
+ stash->colors[stash->nverts] = c;
+ stash->nverts++;
+}
+
+static float fons__getVertAlign(FONScontext* stash, FONSfont* font, int align, short isize)
+{
+ if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+ if (align & FONS_ALIGN_TOP) {
+ return font->ascender * (float)isize/10.0f;
+ } else if (align & FONS_ALIGN_MIDDLE) {
+ return (font->ascender + font->descender) / 2.0f * (float)isize/10.0f;
+ } else if (align & FONS_ALIGN_BASELINE) {
+ return 0.0f;
+ } else if (align & FONS_ALIGN_BOTTOM) {
+ return font->descender * (float)isize/10.0f;
+ }
+ } else {
+ if (align & FONS_ALIGN_TOP) {
+ return -font->ascender * (float)isize/10.0f;
+ } else if (align & FONS_ALIGN_MIDDLE) {
+ return -(font->ascender + font->descender) / 2.0f * (float)isize/10.0f;
+ } else if (align & FONS_ALIGN_BASELINE) {
+ return 0.0f;
+ } else if (align & FONS_ALIGN_BOTTOM) {
+ return -font->descender * (float)isize/10.0f;
+ }
+ }
+ return 0.0;
+}
+
+float fonsDrawText(FONScontext* stash,
+ float x, float y,
+ const char* str, const char* end)
+{
+ FONSstate* state = fons__getState(stash);
+ unsigned int codepoint;
+ unsigned int utf8state = 0;
+ FONSglyph* glyph = NULL;
+ FONSquad q;
+ int prevGlyphIndex = -1;
+ short isize = (short)(state->size*10.0f);
+ short iblur = (short)state->blur;
+ float scale;
+ FONSfont* font;
+ float width;
+
+ if (stash == NULL) return x;
+ if (state->font < 0 || state->font >= stash->nfonts) return x;
+ font = stash->fonts[state->font];
+ if (font->data == NULL) return x;
+
+ scale = fons__tt_getPixelHeightScale(&font->font, (float)isize/10.0f);
+
+ if (end == NULL)
+ end = str + strlen(str);
+
+ // Align horizontally
+ if (state->align & FONS_ALIGN_LEFT) {
+ // empty
+ } else if (state->align & FONS_ALIGN_RIGHT) {
+ width = fonsTextBounds(stash, x,y, str, end, NULL);
+ x -= width;
+ } else if (state->align & FONS_ALIGN_CENTER) {
+ width = fonsTextBounds(stash, x,y, str, end, NULL);
+ x -= width * 0.5f;
+ }
+ // Align vertically.
+ y += fons__getVertAlign(stash, font, state->align, isize);
+
+ for (; str != end; ++str) {
+ if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str))
+ continue;
+ glyph = fons__getGlyph(stash, font, codepoint, isize, iblur, FONS_GLYPH_BITMAP_REQUIRED);
+ if (glyph != NULL) {
+ fons__getQuad(stash, font, prevGlyphIndex, glyph, scale, state->spacing, &x, &y, &q);
+
+ if (stash->nverts+6 > FONS_VERTEX_COUNT)
+ fons__flush(stash);
+
+ fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color);
+ fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color);
+ fons__vertex(stash, q.x1, q.y0, q.s1, q.t0, state->color);
+
+ fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color);
+ fons__vertex(stash, q.x0, q.y1, q.s0, q.t1, state->color);
+ fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color);
+ }
+ prevGlyphIndex = glyph != NULL ? glyph->index : -1;
+ }
+ fons__flush(stash);
+
+ return x;
+}
+
+int fonsTextIterInit(FONScontext* stash, FONStextIter* iter,
+ float x, float y, const char* str, const char* end, int bitmapOption)
+{
+ FONSstate* state = fons__getState(stash);
+ float width;
+
+ memset(iter, 0, sizeof(*iter));
+
+ if (stash == NULL) return 0;
+ if (state->font < 0 || state->font >= stash->nfonts) return 0;
+ iter->font = stash->fonts[state->font];
+ if (iter->font->data == NULL) return 0;
+
+ iter->isize = (short)(state->size*10.0f);
+ iter->iblur = (short)state->blur;
+ iter->scale = fons__tt_getPixelHeightScale(&iter->font->font, (float)iter->isize/10.0f);
+
+ // Align horizontally
+ if (state->align & FONS_ALIGN_LEFT) {
+ // empty
+ } else if (state->align & FONS_ALIGN_RIGHT) {
+ width = fonsTextBounds(stash, x,y, str, end, NULL);
+ x -= width;
+ } else if (state->align & FONS_ALIGN_CENTER) {
+ width = fonsTextBounds(stash, x,y, str, end, NULL);
+ x -= width * 0.5f;
+ }
+ // Align vertically.
+ y += fons__getVertAlign(stash, iter->font, state->align, iter->isize);
+
+ if (end == NULL)
+ end = str + strlen(str);
+
+ iter->x = iter->nextx = x;
+ iter->y = iter->nexty = y;
+ iter->spacing = state->spacing;
+ iter->str = str;
+ iter->next = str;
+ iter->end = end;
+ iter->codepoint = 0;
+ iter->prevGlyphIndex = -1;
+ iter->bitmapOption = bitmapOption;
+
+ return 1;
+}
+
+int fonsTextIterNext(FONScontext* stash, FONStextIter* iter, FONSquad* quad)
+{
+ FONSglyph* glyph = NULL;
+ const char* str = iter->next;
+ iter->str = iter->next;
+
+ if (str == iter->end)
+ return 0;
+
+ for (; str != iter->end; str++) {
+ if (fons__decutf8(&iter->utf8state, &iter->codepoint, *(const unsigned char*)str))
+ continue;
+ str++;
+ // Get glyph and quad
+ iter->x = iter->nextx;
+ iter->y = iter->nexty;
+ glyph = fons__getGlyph(stash, iter->font, iter->codepoint, iter->isize, iter->iblur, iter->bitmapOption);
+ // If the iterator was initialized with FONS_GLYPH_BITMAP_OPTIONAL, then the UV coordinates of the quad will be invalid.
+ if (glyph != NULL)
+ fons__getQuad(stash, iter->font, iter->prevGlyphIndex, glyph, iter->scale, iter->spacing, &iter->nextx, &iter->nexty, quad);
+ iter->prevGlyphIndex = glyph != NULL ? glyph->index : -1;
+ break;
+ }
+ iter->next = str;
+
+ return 1;
+}
+
+void fonsDrawDebug(FONScontext* stash, float x, float y)
+{
+ int i;
+ int w = stash->params.width;
+ int h = stash->params.height;
+ float u = w == 0 ? 0 : (1.0f / w);
+ float v = h == 0 ? 0 : (1.0f / h);
+
+ if (stash->nverts+6+6 > FONS_VERTEX_COUNT)
+ fons__flush(stash);
+
+ // Draw background
+ fons__vertex(stash, x+0, y+0, u, v, 0x0fffffff);
+ fons__vertex(stash, x+w, y+h, u, v, 0x0fffffff);
+ fons__vertex(stash, x+w, y+0, u, v, 0x0fffffff);
+
+ fons__vertex(stash, x+0, y+0, u, v, 0x0fffffff);
+ fons__vertex(stash, x+0, y+h, u, v, 0x0fffffff);
+ fons__vertex(stash, x+w, y+h, u, v, 0x0fffffff);
+
+ // Draw texture
+ fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff);
+ fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff);
+ fons__vertex(stash, x+w, y+0, 1, 0, 0xffffffff);
+
+ fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff);
+ fons__vertex(stash, x+0, y+h, 0, 1, 0xffffffff);
+ fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff);
+
+ // Drawbug draw atlas
+ for (i = 0; i < stash->atlas->nnodes; i++) {
+ FONSatlasNode* n = &stash->atlas->nodes[i];
+
+ if (stash->nverts+6 > FONS_VERTEX_COUNT)
+ fons__flush(stash);
+
+ fons__vertex(stash, x+n->x+0, y+n->y+0, u, v, 0xc00000ff);
+ fons__vertex(stash, x+n->x+n->width, y+n->y+1, u, v, 0xc00000ff);
+ fons__vertex(stash, x+n->x+n->width, y+n->y+0, u, v, 0xc00000ff);
+
+ fons__vertex(stash, x+n->x+0, y+n->y+0, u, v, 0xc00000ff);
+ fons__vertex(stash, x+n->x+0, y+n->y+1, u, v, 0xc00000ff);
+ fons__vertex(stash, x+n->x+n->width, y+n->y+1, u, v, 0xc00000ff);
+ }
+
+ fons__flush(stash);
+}
+
+float fonsTextBounds(FONScontext* stash,
+ float x, float y,
+ const char* str, const char* end,
+ float* bounds)
+{
+ FONSstate* state = fons__getState(stash);
+ unsigned int codepoint;
+ unsigned int utf8state = 0;
+ FONSquad q;
+ FONSglyph* glyph = NULL;
+ int prevGlyphIndex = -1;
+ short isize = (short)(state->size*10.0f);
+ short iblur = (short)state->blur;
+ float scale;
+ FONSfont* font;
+ float startx, advance;
+ float minx, miny, maxx, maxy;
+
+ if (stash == NULL) return 0;
+ if (state->font < 0 || state->font >= stash->nfonts) return 0;
+ font = stash->fonts[state->font];
+ if (font->data == NULL) return 0;
+
+ scale = fons__tt_getPixelHeightScale(&font->font, (float)isize/10.0f);
+
+ // Align vertically.
+ y += fons__getVertAlign(stash, font, state->align, isize);
+
+ minx = maxx = x;
+ miny = maxy = y;
+ startx = x;
+
+ if (end == NULL)
+ end = str + strlen(str);
+
+ for (; str != end; ++str) {
+ if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str))
+ continue;
+ glyph = fons__getGlyph(stash, font, codepoint, isize, iblur, FONS_GLYPH_BITMAP_OPTIONAL);
+ if (glyph != NULL) {
+ fons__getQuad(stash, font, prevGlyphIndex, glyph, scale, state->spacing, &x, &y, &q);
+ if (q.x0 < minx) minx = q.x0;
+ if (q.x1 > maxx) maxx = q.x1;
+ if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+ if (q.y0 < miny) miny = q.y0;
+ if (q.y1 > maxy) maxy = q.y1;
+ } else {
+ if (q.y1 < miny) miny = q.y1;
+ if (q.y0 > maxy) maxy = q.y0;
+ }
+ }
+ prevGlyphIndex = glyph != NULL ? glyph->index : -1;
+ }
+
+ advance = x - startx;
+
+ // Align horizontally
+ if (state->align & FONS_ALIGN_LEFT) {
+ // empty
+ } else if (state->align & FONS_ALIGN_RIGHT) {
+ minx -= advance;
+ maxx -= advance;
+ } else if (state->align & FONS_ALIGN_CENTER) {
+ minx -= advance * 0.5f;
+ maxx -= advance * 0.5f;
+ }
+
+ if (bounds) {
+ bounds[0] = minx;
+ bounds[1] = miny;
+ bounds[2] = maxx;
+ bounds[3] = maxy;
+ }
+
+ return advance;
+}
+
+void fonsVertMetrics(FONScontext* stash,
+ float* ascender, float* descender, float* lineh)
+{
+ FONSfont* font;
+ FONSstate* state = fons__getState(stash);
+ short isize;
+
+ if (stash == NULL) return;
+ if (state->font < 0 || state->font >= stash->nfonts) return;
+ font = stash->fonts[state->font];
+ isize = (short)(state->size*10.0f);
+ if (font->data == NULL) return;
+
+ if (ascender)
+ *ascender = font->ascender*isize/10.0f;
+ if (descender)
+ *descender = font->descender*isize/10.0f;
+ if (lineh)
+ *lineh = font->lineh*isize/10.0f;
+}
+
+void fonsLineBounds(FONScontext* stash, float y, float* miny, float* maxy)
+{
+ FONSfont* font;
+ FONSstate* state = fons__getState(stash);
+ short isize;
+
+ if (stash == NULL) return;
+ if (state->font < 0 || state->font >= stash->nfonts) return;
+ font = stash->fonts[state->font];
+ isize = (short)(state->size*10.0f);
+ if (font->data == NULL) return;
+
+ y += fons__getVertAlign(stash, font, state->align, isize);
+
+ if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+ *miny = y - font->ascender * (float)isize/10.0f;
+ *maxy = *miny + font->lineh*isize/10.0f;
+ } else {
+ *maxy = y + font->descender * (float)isize/10.0f;
+ *miny = *maxy - font->lineh*isize/10.0f;
+ }
+}
+
+const unsigned char* fonsGetTextureData(FONScontext* stash, int* width, int* height)
+{
+ if (width != NULL)
+ *width = stash->params.width;
+ if (height != NULL)
+ *height = stash->params.height;
+ return stash->texData;
+}
+
+int fonsValidateTexture(FONScontext* stash, int* dirty)
+{
+ if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) {
+ dirty[0] = stash->dirtyRect[0];
+ dirty[1] = stash->dirtyRect[1];
+ dirty[2] = stash->dirtyRect[2];
+ dirty[3] = stash->dirtyRect[3];
+ // Reset dirty rect
+ stash->dirtyRect[0] = stash->params.width;
+ stash->dirtyRect[1] = stash->params.height;
+ stash->dirtyRect[2] = 0;
+ stash->dirtyRect[3] = 0;
+ return 1;
+ }
+ return 0;
+}
+
+void fonsDeleteInternal(FONScontext* stash)
+{
+ int i;
+ if (stash == NULL) return;
+
+ if (stash->params.renderDelete)
+ stash->params.renderDelete(stash->params.userPtr);
+
+ for (i = 0; i < stash->nfonts; ++i)
+ fons__freeFont(stash->fonts[i]);
+
+ if (stash->atlas) fons__deleteAtlas(stash->atlas);
+ if (stash->fonts) free(stash->fonts);
+ if (stash->texData) free(stash->texData);
+ if (stash->scratch) free(stash->scratch);
+ free(stash);
+}
+
+void fonsSetErrorCallback(FONScontext* stash, void (*callback)(void* uptr, int error, int val), void* uptr)
+{
+ if (stash == NULL) return;
+ stash->handleError = callback;
+ stash->errorUptr = uptr;
+}
+
+void fonsGetAtlasSize(FONScontext* stash, int* width, int* height)
+{
+ if (stash == NULL) return;
+ *width = stash->params.width;
+ *height = stash->params.height;
+}
+
+int fonsExpandAtlas(FONScontext* stash, int width, int height)
+{
+ int i, maxy = 0;
+ unsigned char* data = NULL;
+ if (stash == NULL) return 0;
+
+ width = fons__maxi(width, stash->params.width);
+ height = fons__maxi(height, stash->params.height);
+
+ if (width == stash->params.width && height == stash->params.height)
+ return 1;
+
+ // Flush pending glyphs.
+ fons__flush(stash);
+
+ // Create new texture
+ if (stash->params.renderResize != NULL) {
+ if (stash->params.renderResize(stash->params.userPtr, width, height) == 0)
+ return 0;
+ }
+ // Copy old texture data over.
+ data = (unsigned char*)malloc(width * height);
+ if (data == NULL)
+ return 0;
+ for (i = 0; i < stash->params.height; i++) {
+ unsigned char* dst = &data[i*width];
+ unsigned char* src = &stash->texData[i*stash->params.width];
+ memcpy(dst, src, stash->params.width);
+ if (width > stash->params.width)
+ memset(dst+stash->params.width, 0, width - stash->params.width);
+ }
+ if (height > stash->params.height)
+ memset(&data[stash->params.height * width], 0, (height - stash->params.height) * width);
+
+ free(stash->texData);
+ stash->texData = data;
+
+ // Increase atlas size
+ fons__atlasExpand(stash->atlas, width, height);
+
+ // Add existing data as dirty.
+ for (i = 0; i < stash->atlas->nnodes; i++)
+ maxy = fons__maxi(maxy, stash->atlas->nodes[i].y);
+ stash->dirtyRect[0] = 0;
+ stash->dirtyRect[1] = 0;
+ stash->dirtyRect[2] = stash->params.width;
+ stash->dirtyRect[3] = maxy;
+
+ stash->params.width = width;
+ stash->params.height = height;
+ stash->itw = 1.0f/stash->params.width;
+ stash->ith = 1.0f/stash->params.height;
+
+ return 1;
+}
+
+int fonsResetAtlas(FONScontext* stash, int width, int height)
+{
+ int i, j;
+ if (stash == NULL) return 0;
+
+ // Flush pending glyphs.
+ fons__flush(stash);
+
+ // Create new texture
+ if (stash->params.renderResize != NULL) {
+ if (stash->params.renderResize(stash->params.userPtr, width, height) == 0)
+ return 0;
+ }
+
+ // Reset atlas
+ fons__atlasReset(stash->atlas, width, height);
+
+ // Clear texture data.
+ stash->texData = (unsigned char*)realloc(stash->texData, width * height);
+ if (stash->texData == NULL) return 0;
+ memset(stash->texData, 0, width * height);
+
+ // Reset dirty rect
+ stash->dirtyRect[0] = width;
+ stash->dirtyRect[1] = height;
+ stash->dirtyRect[2] = 0;
+ stash->dirtyRect[3] = 0;
+
+ // Reset cached glyphs
+ for (i = 0; i < stash->nfonts; i++) {
+ FONSfont* font = stash->fonts[i];
+ font->nglyphs = 0;
+ for (j = 0; j < FONS_HASH_LUT_SIZE; j++)
+ font->lut[j] = -1;
+ }
+
+ stash->params.width = width;
+ stash->params.height = height;
+ stash->itw = 1.0f/stash->params.width;
+ stash->ith = 1.0f/stash->params.height;
+
+ // Add white rect at 0,0 for debug drawing.
+ fons__addWhiteRect(stash, 2,2);
+
+ return 1;
+}
+
+
+#endif
diff --git a/deps/nanovg/nanovg.c b/deps/nanovg/nanovg.c
@@ -0,0 +1,2906 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would be
+// appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+// misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <memory.h>
+
+#include "nanovg.h"
+#define FONTSTASH_IMPLEMENTATION
+#include "fontstash.h"
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+#ifdef _MSC_VER
+#pragma warning(disable: 4100) // unreferenced formal parameter
+#pragma warning(disable: 4127) // conditional expression is constant
+#pragma warning(disable: 4204) // nonstandard extension used : non-constant aggregate initializer
+#pragma warning(disable: 4706) // assignment within conditional expression
+#endif
+
+#define NVG_INIT_FONTIMAGE_SIZE 512
+#define NVG_MAX_FONTIMAGE_SIZE 2048
+#define NVG_MAX_FONTIMAGES 4
+
+#define NVG_INIT_COMMANDS_SIZE 256
+#define NVG_INIT_POINTS_SIZE 128
+#define NVG_INIT_PATHS_SIZE 16
+#define NVG_INIT_VERTS_SIZE 256
+#define NVG_MAX_STATES 32
+
+#define NVG_KAPPA90 0.5522847493f // Length proportional to radius of a cubic bezier handle for 90deg arcs.
+
+#define NVG_COUNTOF(arr) (sizeof(arr) / sizeof(0[arr]))
+
+
+enum NVGcommands {
+ NVG_MOVETO = 0,
+ NVG_LINETO = 1,
+ NVG_BEZIERTO = 2,
+ NVG_CLOSE = 3,
+ NVG_WINDING = 4,
+};
+
+enum NVGpointFlags
+{
+ NVG_PT_CORNER = 0x01,
+ NVG_PT_LEFT = 0x02,
+ NVG_PT_BEVEL = 0x04,
+ NVG_PR_INNERBEVEL = 0x08,
+};
+
+struct NVGstate {
+ NVGcompositeOperationState compositeOperation;
+ int shapeAntiAlias;
+ NVGpaint fill;
+ NVGpaint stroke;
+ float strokeWidth;
+ float miterLimit;
+ int lineJoin;
+ int lineCap;
+ float alpha;
+ float xform[6];
+ NVGscissor scissor;
+ float fontSize;
+ float letterSpacing;
+ float lineHeight;
+ float fontBlur;
+ int textAlign;
+ int fontId;
+};
+typedef struct NVGstate NVGstate;
+
+struct NVGpoint {
+ float x,y;
+ float dx, dy;
+ float len;
+ float dmx, dmy;
+ unsigned char flags;
+};
+typedef struct NVGpoint NVGpoint;
+
+struct NVGpathCache {
+ NVGpoint* points;
+ int npoints;
+ int cpoints;
+ NVGpath* paths;
+ int npaths;
+ int cpaths;
+ NVGvertex* verts;
+ int nverts;
+ int cverts;
+ float bounds[4];
+};
+typedef struct NVGpathCache NVGpathCache;
+
+struct NVGcontext {
+ NVGparams params;
+ float* commands;
+ int ccommands;
+ int ncommands;
+ float commandx, commandy;
+ NVGstate states[NVG_MAX_STATES];
+ int nstates;
+ NVGpathCache* cache;
+ float tessTol;
+ float distTol;
+ float fringeWidth;
+ float devicePxRatio;
+ struct FONScontext* fs;
+ int fontImages[NVG_MAX_FONTIMAGES];
+ int fontImageIdx;
+ int drawCallCount;
+ int fillTriCount;
+ int strokeTriCount;
+ int textTriCount;
+};
+
+static float nvg__sqrtf(float a) { return sqrtf(a); }
+static float nvg__modf(float a, float b) { return fmodf(a, b); }
+static float nvg__sinf(float a) { return sinf(a); }
+static float nvg__cosf(float a) { return cosf(a); }
+static float nvg__tanf(float a) { return tanf(a); }
+static float nvg__atan2f(float a,float b) { return atan2f(a, b); }
+static float nvg__acosf(float a) { return acosf(a); }
+
+static int nvg__mini(int a, int b) { return a < b ? a : b; }
+static int nvg__maxi(int a, int b) { return a > b ? a : b; }
+static int nvg__clampi(int a, int mn, int mx) { return a < mn ? mn : (a > mx ? mx : a); }
+static float nvg__minf(float a, float b) { return a < b ? a : b; }
+static float nvg__maxf(float a, float b) { return a > b ? a : b; }
+static float nvg__absf(float a) { return a >= 0.0f ? a : -a; }
+static float nvg__signf(float a) { return a >= 0.0f ? 1.0f : -1.0f; }
+static float nvg__clampf(float a, float mn, float mx) { return a < mn ? mn : (a > mx ? mx : a); }
+static float nvg__cross(float dx0, float dy0, float dx1, float dy1) { return dx1*dy0 - dx0*dy1; }
+
+static float nvg__normalize(float *x, float* y)
+{
+ float d = nvg__sqrtf((*x)*(*x) + (*y)*(*y));
+ if (d > 1e-6f) {
+ float id = 1.0f / d;
+ *x *= id;
+ *y *= id;
+ }
+ return d;
+}
+
+
+static void nvg__deletePathCache(NVGpathCache* c)
+{
+ if (c == NULL) return;
+ if (c->points != NULL) free(c->points);
+ if (c->paths != NULL) free(c->paths);
+ if (c->verts != NULL) free(c->verts);
+ free(c);
+}
+
+static NVGpathCache* nvg__allocPathCache(void)
+{
+ NVGpathCache* c = (NVGpathCache*)malloc(sizeof(NVGpathCache));
+ if (c == NULL) goto error;
+ memset(c, 0, sizeof(NVGpathCache));
+
+ c->points = (NVGpoint*)malloc(sizeof(NVGpoint)*NVG_INIT_POINTS_SIZE);
+ if (!c->points) goto error;
+ c->npoints = 0;
+ c->cpoints = NVG_INIT_POINTS_SIZE;
+
+ c->paths = (NVGpath*)malloc(sizeof(NVGpath)*NVG_INIT_PATHS_SIZE);
+ if (!c->paths) goto error;
+ c->npaths = 0;
+ c->cpaths = NVG_INIT_PATHS_SIZE;
+
+ c->verts = (NVGvertex*)malloc(sizeof(NVGvertex)*NVG_INIT_VERTS_SIZE);
+ if (!c->verts) goto error;
+ c->nverts = 0;
+ c->cverts = NVG_INIT_VERTS_SIZE;
+
+ return c;
+error:
+ nvg__deletePathCache(c);
+ return NULL;
+}
+
+static void nvg__setDevicePixelRatio(NVGcontext* ctx, float ratio)
+{
+ ctx->tessTol = 0.25f / ratio;
+ ctx->distTol = 0.01f / ratio;
+ ctx->fringeWidth = 1.0f / ratio;
+ ctx->devicePxRatio = ratio;
+}
+
+static NVGcompositeOperationState nvg__compositeOperationState(int op)
+{
+ int sfactor, dfactor;
+
+ if (op == NVG_SOURCE_OVER)
+ {
+ sfactor = NVG_ONE;
+ dfactor = NVG_ONE_MINUS_SRC_ALPHA;
+ }
+ else if (op == NVG_SOURCE_IN)
+ {
+ sfactor = NVG_DST_ALPHA;
+ dfactor = NVG_ZERO;
+ }
+ else if (op == NVG_SOURCE_OUT)
+ {
+ sfactor = NVG_ONE_MINUS_DST_ALPHA;
+ dfactor = NVG_ZERO;
+ }
+ else if (op == NVG_ATOP)
+ {
+ sfactor = NVG_DST_ALPHA;
+ dfactor = NVG_ONE_MINUS_SRC_ALPHA;
+ }
+ else if (op == NVG_DESTINATION_OVER)
+ {
+ sfactor = NVG_ONE_MINUS_DST_ALPHA;
+ dfactor = NVG_ONE;
+ }
+ else if (op == NVG_DESTINATION_IN)
+ {
+ sfactor = NVG_ZERO;
+ dfactor = NVG_SRC_ALPHA;
+ }
+ else if (op == NVG_DESTINATION_OUT)
+ {
+ sfactor = NVG_ZERO;
+ dfactor = NVG_ONE_MINUS_SRC_ALPHA;
+ }
+ else if (op == NVG_DESTINATION_ATOP)
+ {
+ sfactor = NVG_ONE_MINUS_DST_ALPHA;
+ dfactor = NVG_SRC_ALPHA;
+ }
+ else if (op == NVG_LIGHTER)
+ {
+ sfactor = NVG_ONE;
+ dfactor = NVG_ONE;
+ }
+ else if (op == NVG_COPY)
+ {
+ sfactor = NVG_ONE;
+ dfactor = NVG_ZERO;
+ }
+ else if (op == NVG_XOR)
+ {
+ sfactor = NVG_ONE_MINUS_DST_ALPHA;
+ dfactor = NVG_ONE_MINUS_SRC_ALPHA;
+ }
+ else
+ {
+ sfactor = NVG_ONE;
+ dfactor = NVG_ZERO;
+ }
+
+ NVGcompositeOperationState state;
+ state.srcRGB = sfactor;
+ state.dstRGB = dfactor;
+ state.srcAlpha = sfactor;
+ state.dstAlpha = dfactor;
+ return state;
+}
+
+static NVGstate* nvg__getState(NVGcontext* ctx)
+{
+ return &ctx->states[ctx->nstates-1];
+}
+
+NVGcontext* nvgCreateInternal(NVGparams* params)
+{
+ FONSparams fontParams;
+ NVGcontext* ctx = (NVGcontext*)malloc(sizeof(NVGcontext));
+ int i;
+ if (ctx == NULL) goto error;
+ memset(ctx, 0, sizeof(NVGcontext));
+
+ ctx->params = *params;
+ for (i = 0; i < NVG_MAX_FONTIMAGES; i++)
+ ctx->fontImages[i] = 0;
+
+ ctx->commands = (float*)malloc(sizeof(float)*NVG_INIT_COMMANDS_SIZE);
+ if (!ctx->commands) goto error;
+ ctx->ncommands = 0;
+ ctx->ccommands = NVG_INIT_COMMANDS_SIZE;
+
+ ctx->cache = nvg__allocPathCache();
+ if (ctx->cache == NULL) goto error;
+
+ nvgSave(ctx);
+ nvgReset(ctx);
+
+ nvg__setDevicePixelRatio(ctx, 1.0f);
+
+ if (ctx->params.renderCreate(ctx->params.userPtr) == 0) goto error;
+
+ // Init font rendering
+ memset(&fontParams, 0, sizeof(fontParams));
+ fontParams.width = NVG_INIT_FONTIMAGE_SIZE;
+ fontParams.height = NVG_INIT_FONTIMAGE_SIZE;
+ fontParams.flags = FONS_ZERO_TOPLEFT;
+ fontParams.renderCreate = NULL;
+ fontParams.renderUpdate = NULL;
+ fontParams.renderDraw = NULL;
+ fontParams.renderDelete = NULL;
+ fontParams.userPtr = NULL;
+ ctx->fs = fonsCreateInternal(&fontParams);
+ if (ctx->fs == NULL) goto error;
+
+ // Create font texture
+ ctx->fontImages[0] = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, fontParams.width, fontParams.height, 0, NULL);
+ if (ctx->fontImages[0] == 0) goto error;
+ ctx->fontImageIdx = 0;
+
+ return ctx;
+
+error:
+ nvgDeleteInternal(ctx);
+ return 0;
+}
+
+NVGparams* nvgInternalParams(NVGcontext* ctx)
+{
+ return &ctx->params;
+}
+
+void nvgDeleteInternal(NVGcontext* ctx)
+{
+ int i;
+ if (ctx == NULL) return;
+ if (ctx->commands != NULL) free(ctx->commands);
+ if (ctx->cache != NULL) nvg__deletePathCache(ctx->cache);
+
+ if (ctx->fs)
+ fonsDeleteInternal(ctx->fs);
+
+ for (i = 0; i < NVG_MAX_FONTIMAGES; i++) {
+ if (ctx->fontImages[i] != 0) {
+ nvgDeleteImage(ctx, ctx->fontImages[i]);
+ ctx->fontImages[i] = 0;
+ }
+ }
+
+ if (ctx->params.renderDelete != NULL)
+ ctx->params.renderDelete(ctx->params.userPtr);
+
+ free(ctx);
+}
+
+void nvgBeginFrame(NVGcontext* ctx, float windowWidth, float windowHeight, float devicePixelRatio)
+{
+/* printf("Tris: draws:%d fill:%d stroke:%d text:%d TOT:%d\n",
+ ctx->drawCallCount, ctx->fillTriCount, ctx->strokeTriCount, ctx->textTriCount,
+ ctx->fillTriCount+ctx->strokeTriCount+ctx->textTriCount);*/
+
+ ctx->nstates = 0;
+ nvgSave(ctx);
+ nvgReset(ctx);
+
+ nvg__setDevicePixelRatio(ctx, devicePixelRatio);
+
+ ctx->params.renderViewport(ctx->params.userPtr, windowWidth, windowHeight, devicePixelRatio);
+
+ ctx->drawCallCount = 0;
+ ctx->fillTriCount = 0;
+ ctx->strokeTriCount = 0;
+ ctx->textTriCount = 0;
+}
+
+void nvgCancelFrame(NVGcontext* ctx)
+{
+ ctx->params.renderCancel(ctx->params.userPtr);
+}
+
+void nvgEndFrame(NVGcontext* ctx)
+{
+ ctx->params.renderFlush(ctx->params.userPtr);
+ if (ctx->fontImageIdx != 0) {
+ int fontImage = ctx->fontImages[ctx->fontImageIdx];
+ int i, j, iw, ih;
+ // delete images that smaller than current one
+ if (fontImage == 0)
+ return;
+ nvgImageSize(ctx, fontImage, &iw, &ih);
+ for (i = j = 0; i < ctx->fontImageIdx; i++) {
+ if (ctx->fontImages[i] != 0) {
+ int nw, nh;
+ nvgImageSize(ctx, ctx->fontImages[i], &nw, &nh);
+ if (nw < iw || nh < ih)
+ nvgDeleteImage(ctx, ctx->fontImages[i]);
+ else
+ ctx->fontImages[j++] = ctx->fontImages[i];
+ }
+ }
+ // make current font image to first
+ ctx->fontImages[j++] = ctx->fontImages[0];
+ ctx->fontImages[0] = fontImage;
+ ctx->fontImageIdx = 0;
+ // clear all images after j
+ for (i = j; i < NVG_MAX_FONTIMAGES; i++)
+ ctx->fontImages[i] = 0;
+ }
+}
+
+NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b)
+{
+ return nvgRGBA(r,g,b,255);
+}
+
+NVGcolor nvgRGBf(float r, float g, float b)
+{
+ return nvgRGBAf(r,g,b,1.0f);
+}
+
+NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
+{
+ NVGcolor color;
+ // Use longer initialization to suppress warning.
+ color.r = r / 255.0f;
+ color.g = g / 255.0f;
+ color.b = b / 255.0f;
+ color.a = a / 255.0f;
+ return color;
+}
+
+NVGcolor nvgRGBAf(float r, float g, float b, float a)
+{
+ NVGcolor color;
+ // Use longer initialization to suppress warning.
+ color.r = r;
+ color.g = g;
+ color.b = b;
+ color.a = a;
+ return color;
+}
+
+NVGcolor nvgTransRGBA(NVGcolor c, unsigned char a)
+{
+ c.a = a / 255.0f;
+ return c;
+}
+
+NVGcolor nvgTransRGBAf(NVGcolor c, float a)
+{
+ c.a = a;
+ return c;
+}
+
+NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u)
+{
+ int i;
+ float oneminu;
+ NVGcolor cint = {{{0}}};
+
+ u = nvg__clampf(u, 0.0f, 1.0f);
+ oneminu = 1.0f - u;
+ for( i = 0; i <4; i++ )
+ {
+ cint.rgba[i] = c0.rgba[i] * oneminu + c1.rgba[i] * u;
+ }
+
+ return cint;
+}
+
+NVGcolor nvgHSL(float h, float s, float l)
+{
+ return nvgHSLA(h,s,l,255);
+}
+
+static float nvg__hue(float h, float m1, float m2)
+{
+ if (h < 0) h += 1;
+ if (h > 1) h -= 1;
+ if (h < 1.0f/6.0f)
+ return m1 + (m2 - m1) * h * 6.0f;
+ else if (h < 3.0f/6.0f)
+ return m2;
+ else if (h < 4.0f/6.0f)
+ return m1 + (m2 - m1) * (2.0f/3.0f - h) * 6.0f;
+ return m1;
+}
+
+NVGcolor nvgHSLA(float h, float s, float l, unsigned char a)
+{
+ float m1, m2;
+ NVGcolor col;
+ h = nvg__modf(h, 1.0f);
+ if (h < 0.0f) h += 1.0f;
+ s = nvg__clampf(s, 0.0f, 1.0f);
+ l = nvg__clampf(l, 0.0f, 1.0f);
+ m2 = l <= 0.5f ? (l * (1 + s)) : (l + s - l * s);
+ m1 = 2 * l - m2;
+ col.r = nvg__clampf(nvg__hue(h + 1.0f/3.0f, m1, m2), 0.0f, 1.0f);
+ col.g = nvg__clampf(nvg__hue(h, m1, m2), 0.0f, 1.0f);
+ col.b = nvg__clampf(nvg__hue(h - 1.0f/3.0f, m1, m2), 0.0f, 1.0f);
+ col.a = a/255.0f;
+ return col;
+}
+
+void nvgTransformIdentity(float* t)
+{
+ t[0] = 1.0f; t[1] = 0.0f;
+ t[2] = 0.0f; t[3] = 1.0f;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformTranslate(float* t, float tx, float ty)
+{
+ t[0] = 1.0f; t[1] = 0.0f;
+ t[2] = 0.0f; t[3] = 1.0f;
+ t[4] = tx; t[5] = ty;
+}
+
+void nvgTransformScale(float* t, float sx, float sy)
+{
+ t[0] = sx; t[1] = 0.0f;
+ t[2] = 0.0f; t[3] = sy;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformRotate(float* t, float a)
+{
+ float cs = nvg__cosf(a), sn = nvg__sinf(a);
+ t[0] = cs; t[1] = sn;
+ t[2] = -sn; t[3] = cs;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformSkewX(float* t, float a)
+{
+ t[0] = 1.0f; t[1] = 0.0f;
+ t[2] = nvg__tanf(a); t[3] = 1.0f;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformSkewY(float* t, float a)
+{
+ t[0] = 1.0f; t[1] = nvg__tanf(a);
+ t[2] = 0.0f; t[3] = 1.0f;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformMultiply(float* t, const float* s)
+{
+ float t0 = t[0] * s[0] + t[1] * s[2];
+ float t2 = t[2] * s[0] + t[3] * s[2];
+ float t4 = t[4] * s[0] + t[5] * s[2] + s[4];
+ t[1] = t[0] * s[1] + t[1] * s[3];
+ t[3] = t[2] * s[1] + t[3] * s[3];
+ t[5] = t[4] * s[1] + t[5] * s[3] + s[5];
+ t[0] = t0;
+ t[2] = t2;
+ t[4] = t4;
+}
+
+void nvgTransformPremultiply(float* t, const float* s)
+{
+ float s2[6];
+ memcpy(s2, s, sizeof(float)*6);
+ nvgTransformMultiply(s2, t);
+ memcpy(t, s2, sizeof(float)*6);
+}
+
+int nvgTransformInverse(float* inv, const float* t)
+{
+ double invdet, det = (double)t[0] * t[3] - (double)t[2] * t[1];
+ if (det > -1e-6 && det < 1e-6) {
+ nvgTransformIdentity(inv);
+ return 0;
+ }
+ invdet = 1.0 / det;
+ inv[0] = (float)(t[3] * invdet);
+ inv[2] = (float)(-t[2] * invdet);
+ inv[4] = (float)(((double)t[2] * t[5] - (double)t[3] * t[4]) * invdet);
+ inv[1] = (float)(-t[1] * invdet);
+ inv[3] = (float)(t[0] * invdet);
+ inv[5] = (float)(((double)t[1] * t[4] - (double)t[0] * t[5]) * invdet);
+ return 1;
+}
+
+void nvgTransformPoint(float* dx, float* dy, const float* t, float sx, float sy)
+{
+ *dx = sx*t[0] + sy*t[2] + t[4];
+ *dy = sx*t[1] + sy*t[3] + t[5];
+}
+
+float nvgDegToRad(float deg)
+{
+ return deg / 180.0f * NVG_PI;
+}
+
+float nvgRadToDeg(float rad)
+{
+ return rad / NVG_PI * 180.0f;
+}
+
+static void nvg__setPaintColor(NVGpaint* p, NVGcolor color)
+{
+ memset(p, 0, sizeof(*p));
+ nvgTransformIdentity(p->xform);
+ p->radius = 0.0f;
+ p->feather = 1.0f;
+ p->innerColor = color;
+ p->outerColor = color;
+}
+
+
+// State handling
+void nvgSave(NVGcontext* ctx)
+{
+ if (ctx->nstates >= NVG_MAX_STATES)
+ return;
+ if (ctx->nstates > 0)
+ memcpy(&ctx->states[ctx->nstates], &ctx->states[ctx->nstates-1], sizeof(NVGstate));
+ ctx->nstates++;
+}
+
+void nvgRestore(NVGcontext* ctx)
+{
+ if (ctx->nstates <= 1)
+ return;
+ ctx->nstates--;
+}
+
+void nvgReset(NVGcontext* ctx)
+{
+ NVGstate* state = nvg__getState(ctx);
+ memset(state, 0, sizeof(*state));
+
+ nvg__setPaintColor(&state->fill, nvgRGBA(255,255,255,255));
+ nvg__setPaintColor(&state->stroke, nvgRGBA(0,0,0,255));
+ state->compositeOperation = nvg__compositeOperationState(NVG_SOURCE_OVER);
+ state->shapeAntiAlias = 1;
+ state->strokeWidth = 1.0f;
+ state->miterLimit = 10.0f;
+ state->lineCap = NVG_BUTT;
+ state->lineJoin = NVG_MITER;
+ state->alpha = 1.0f;
+ nvgTransformIdentity(state->xform);
+
+ state->scissor.extent[0] = -1.0f;
+ state->scissor.extent[1] = -1.0f;
+
+ state->fontSize = 16.0f;
+ state->letterSpacing = 0.0f;
+ state->lineHeight = 1.0f;
+ state->fontBlur = 0.0f;
+ state->textAlign = NVG_ALIGN_LEFT | NVG_ALIGN_BASELINE;
+ state->fontId = 0;
+}
+
+// State setting
+void nvgShapeAntiAlias(NVGcontext* ctx, int enabled)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->shapeAntiAlias = enabled;
+}
+
+void nvgStrokeWidth(NVGcontext* ctx, float width)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->strokeWidth = width;
+}
+
+void nvgMiterLimit(NVGcontext* ctx, float limit)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->miterLimit = limit;
+}
+
+void nvgLineCap(NVGcontext* ctx, int cap)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->lineCap = cap;
+}
+
+void nvgLineJoin(NVGcontext* ctx, int join)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->lineJoin = join;
+}
+
+void nvgGlobalAlpha(NVGcontext* ctx, float alpha)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->alpha = alpha;
+}
+
+void nvgTransform(NVGcontext* ctx, float a, float b, float c, float d, float e, float f)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float t[6] = { a, b, c, d, e, f };
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgResetTransform(NVGcontext* ctx)
+{
+ NVGstate* state = nvg__getState(ctx);
+ nvgTransformIdentity(state->xform);
+}
+
+void nvgTranslate(NVGcontext* ctx, float x, float y)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformTranslate(t, x,y);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgRotate(NVGcontext* ctx, float angle)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformRotate(t, angle);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgSkewX(NVGcontext* ctx, float angle)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformSkewX(t, angle);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgSkewY(NVGcontext* ctx, float angle)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformSkewY(t, angle);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgScale(NVGcontext* ctx, float x, float y)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformScale(t, x,y);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgCurrentTransform(NVGcontext* ctx, float* xform)
+{
+ NVGstate* state = nvg__getState(ctx);
+ if (xform == NULL) return;
+ memcpy(xform, state->xform, sizeof(float)*6);
+}
+
+void nvgStrokeColor(NVGcontext* ctx, NVGcolor color)
+{
+ NVGstate* state = nvg__getState(ctx);
+ nvg__setPaintColor(&state->stroke, color);
+}
+
+void nvgStrokePaint(NVGcontext* ctx, NVGpaint paint)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->stroke = paint;
+ nvgTransformMultiply(state->stroke.xform, state->xform);
+}
+
+void nvgFillColor(NVGcontext* ctx, NVGcolor color)
+{
+ NVGstate* state = nvg__getState(ctx);
+ nvg__setPaintColor(&state->fill, color);
+}
+
+void nvgFillPaint(NVGcontext* ctx, NVGpaint paint)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->fill = paint;
+ nvgTransformMultiply(state->fill.xform, state->xform);
+}
+
+int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags)
+{
+ int w, h, n, image;
+ unsigned char* img;
+ stbi_set_unpremultiply_on_load(1);
+ stbi_convert_iphone_png_to_rgb(1);
+ img = stbi_load(filename, &w, &h, &n, 4);
+ if (img == NULL) {
+// printf("Failed to load %s - %s\n", filename, stbi_failure_reason());
+ return 0;
+ }
+ image = nvgCreateImageRGBA(ctx, w, h, imageFlags, img);
+ stbi_image_free(img);
+ return image;
+}
+
+int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, unsigned char* data, int ndata)
+{
+ int w, h, n, image;
+ unsigned char* img = stbi_load_from_memory(data, ndata, &w, &h, &n, 4);
+ if (img == NULL) {
+// printf("Failed to load %s - %s\n", filename, stbi_failure_reason());
+ return 0;
+ }
+ image = nvgCreateImageRGBA(ctx, w, h, imageFlags, img);
+ stbi_image_free(img);
+ return image;
+}
+
+int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data)
+{
+ return ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_RGBA, w, h, imageFlags, data);
+}
+
+void nvgUpdateImage(NVGcontext* ctx, int image, const unsigned char* data)
+{
+ int w, h;
+ ctx->params.renderGetTextureSize(ctx->params.userPtr, image, &w, &h);
+ ctx->params.renderUpdateTexture(ctx->params.userPtr, image, 0,0, w,h, data);
+}
+
+void nvgImageSize(NVGcontext* ctx, int image, int* w, int* h)
+{
+ ctx->params.renderGetTextureSize(ctx->params.userPtr, image, w, h);
+}
+
+void nvgDeleteImage(NVGcontext* ctx, int image)
+{
+ ctx->params.renderDeleteTexture(ctx->params.userPtr, image);
+}
+
+NVGpaint nvgLinearGradient(NVGcontext* ctx,
+ float sx, float sy, float ex, float ey,
+ NVGcolor icol, NVGcolor ocol)
+{
+ NVGpaint p;
+ float dx, dy, d;
+ const float large = 1e5;
+ NVG_NOTUSED(ctx);
+ memset(&p, 0, sizeof(p));
+
+ // Calculate transform aligned to the line
+ dx = ex - sx;
+ dy = ey - sy;
+ d = sqrtf(dx*dx + dy*dy);
+ if (d > 0.0001f) {
+ dx /= d;
+ dy /= d;
+ } else {
+ dx = 0;
+ dy = 1;
+ }
+
+ p.xform[0] = dy; p.xform[1] = -dx;
+ p.xform[2] = dx; p.xform[3] = dy;
+ p.xform[4] = sx - dx*large; p.xform[5] = sy - dy*large;
+
+ p.extent[0] = large;
+ p.extent[1] = large + d*0.5f;
+
+ p.radius = 0.0f;
+
+ p.feather = nvg__maxf(1.0f, d);
+
+ p.innerColor = icol;
+ p.outerColor = ocol;
+
+ return p;
+}
+
+NVGpaint nvgRadialGradient(NVGcontext* ctx,
+ float cx, float cy, float inr, float outr,
+ NVGcolor icol, NVGcolor ocol)
+{
+ NVGpaint p;
+ float r = (inr+outr)*0.5f;
+ float f = (outr-inr);
+ NVG_NOTUSED(ctx);
+ memset(&p, 0, sizeof(p));
+
+ nvgTransformIdentity(p.xform);
+ p.xform[4] = cx;
+ p.xform[5] = cy;
+
+ p.extent[0] = r;
+ p.extent[1] = r;
+
+ p.radius = r;
+
+ p.feather = nvg__maxf(1.0f, f);
+
+ p.innerColor = icol;
+ p.outerColor = ocol;
+
+ return p;
+}
+
+NVGpaint nvgBoxGradient(NVGcontext* ctx,
+ float x, float y, float w, float h, float r, float f,
+ NVGcolor icol, NVGcolor ocol)
+{
+ NVGpaint p;
+ NVG_NOTUSED(ctx);
+ memset(&p, 0, sizeof(p));
+
+ nvgTransformIdentity(p.xform);
+ p.xform[4] = x+w*0.5f;
+ p.xform[5] = y+h*0.5f;
+
+ p.extent[0] = w*0.5f;
+ p.extent[1] = h*0.5f;
+
+ p.radius = r;
+
+ p.feather = nvg__maxf(1.0f, f);
+
+ p.innerColor = icol;
+ p.outerColor = ocol;
+
+ return p;
+}
+
+
+NVGpaint nvgImagePattern(NVGcontext* ctx,
+ float cx, float cy, float w, float h, float angle,
+ int image, float alpha)
+{
+ NVGpaint p;
+ NVG_NOTUSED(ctx);
+ memset(&p, 0, sizeof(p));
+
+ nvgTransformRotate(p.xform, angle);
+ p.xform[4] = cx;
+ p.xform[5] = cy;
+
+ p.extent[0] = w;
+ p.extent[1] = h;
+
+ p.image = image;
+
+ p.innerColor = p.outerColor = nvgRGBAf(1,1,1,alpha);
+
+ return p;
+}
+
+// Scissoring
+void nvgScissor(NVGcontext* ctx, float x, float y, float w, float h)
+{
+ NVGstate* state = nvg__getState(ctx);
+
+ w = nvg__maxf(0.0f, w);
+ h = nvg__maxf(0.0f, h);
+
+ nvgTransformIdentity(state->scissor.xform);
+ state->scissor.xform[4] = x+w*0.5f;
+ state->scissor.xform[5] = y+h*0.5f;
+ nvgTransformMultiply(state->scissor.xform, state->xform);
+
+ state->scissor.extent[0] = w*0.5f;
+ state->scissor.extent[1] = h*0.5f;
+}
+
+static void nvg__isectRects(float* dst,
+ float ax, float ay, float aw, float ah,
+ float bx, float by, float bw, float bh)
+{
+ float minx = nvg__maxf(ax, bx);
+ float miny = nvg__maxf(ay, by);
+ float maxx = nvg__minf(ax+aw, bx+bw);
+ float maxy = nvg__minf(ay+ah, by+bh);
+ dst[0] = minx;
+ dst[1] = miny;
+ dst[2] = nvg__maxf(0.0f, maxx - minx);
+ dst[3] = nvg__maxf(0.0f, maxy - miny);
+}
+
+void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float pxform[6], invxorm[6];
+ float rect[4];
+ float ex, ey, tex, tey;
+
+ // If no previous scissor has been set, set the scissor as current scissor.
+ if (state->scissor.extent[0] < 0) {
+ nvgScissor(ctx, x, y, w, h);
+ return;
+ }
+
+ // Transform the current scissor rect into current transform space.
+ // If there is difference in rotation, this will be approximation.
+ memcpy(pxform, state->scissor.xform, sizeof(float)*6);
+ ex = state->scissor.extent[0];
+ ey = state->scissor.extent[1];
+ nvgTransformInverse(invxorm, state->xform);
+ nvgTransformMultiply(pxform, invxorm);
+ tex = ex*nvg__absf(pxform[0]) + ey*nvg__absf(pxform[2]);
+ tey = ex*nvg__absf(pxform[1]) + ey*nvg__absf(pxform[3]);
+
+ // Intersect rects.
+ nvg__isectRects(rect, pxform[4]-tex,pxform[5]-tey,tex*2,tey*2, x,y,w,h);
+
+ nvgScissor(ctx, rect[0], rect[1], rect[2], rect[3]);
+}
+
+void nvgResetScissor(NVGcontext* ctx)
+{
+ NVGstate* state = nvg__getState(ctx);
+ memset(state->scissor.xform, 0, sizeof(state->scissor.xform));
+ state->scissor.extent[0] = -1.0f;
+ state->scissor.extent[1] = -1.0f;
+}
+
+// Global composite operation.
+void nvgGlobalCompositeOperation(NVGcontext* ctx, int op)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->compositeOperation = nvg__compositeOperationState(op);
+}
+
+void nvgGlobalCompositeBlendFunc(NVGcontext* ctx, int sfactor, int dfactor)
+{
+ nvgGlobalCompositeBlendFuncSeparate(ctx, sfactor, dfactor, sfactor, dfactor);
+}
+
+void nvgGlobalCompositeBlendFuncSeparate(NVGcontext* ctx, int srcRGB, int dstRGB, int srcAlpha, int dstAlpha)
+{
+ NVGcompositeOperationState op;
+ op.srcRGB = srcRGB;
+ op.dstRGB = dstRGB;
+ op.srcAlpha = srcAlpha;
+ op.dstAlpha = dstAlpha;
+
+ NVGstate* state = nvg__getState(ctx);
+ state->compositeOperation = op;
+}
+
+static int nvg__ptEquals(float x1, float y1, float x2, float y2, float tol)
+{
+ float dx = x2 - x1;
+ float dy = y2 - y1;
+ return dx*dx + dy*dy < tol*tol;
+}
+
+static float nvg__distPtSeg(float x, float y, float px, float py, float qx, float qy)
+{
+ float pqx, pqy, dx, dy, d, t;
+ pqx = qx-px;
+ pqy = qy-py;
+ dx = x-px;
+ dy = y-py;
+ d = pqx*pqx + pqy*pqy;
+ t = pqx*dx + pqy*dy;
+ if (d > 0) t /= d;
+ if (t < 0) t = 0;
+ else if (t > 1) t = 1;
+ dx = px + t*pqx - x;
+ dy = py + t*pqy - y;
+ return dx*dx + dy*dy;
+}
+
+static void nvg__appendCommands(NVGcontext* ctx, float* vals, int nvals)
+{
+ NVGstate* state = nvg__getState(ctx);
+ int i;
+
+ if (ctx->ncommands+nvals > ctx->ccommands) {
+ float* commands;
+ int ccommands = ctx->ncommands+nvals + ctx->ccommands/2;
+ commands = (float*)realloc(ctx->commands, sizeof(float)*ccommands);
+ if (commands == NULL) return;
+ ctx->commands = commands;
+ ctx->ccommands = ccommands;
+ }
+
+ if ((int)vals[0] != NVG_CLOSE && (int)vals[0] != NVG_WINDING) {
+ ctx->commandx = vals[nvals-2];
+ ctx->commandy = vals[nvals-1];
+ }
+
+ // transform commands
+ i = 0;
+ while (i < nvals) {
+ int cmd = (int)vals[i];
+ switch (cmd) {
+ case NVG_MOVETO:
+ nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]);
+ i += 3;
+ break;
+ case NVG_LINETO:
+ nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]);
+ i += 3;
+ break;
+ case NVG_BEZIERTO:
+ nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]);
+ nvgTransformPoint(&vals[i+3],&vals[i+4], state->xform, vals[i+3],vals[i+4]);
+ nvgTransformPoint(&vals[i+5],&vals[i+6], state->xform, vals[i+5],vals[i+6]);
+ i += 7;
+ break;
+ case NVG_CLOSE:
+ i++;
+ break;
+ case NVG_WINDING:
+ i += 2;
+ break;
+ default:
+ i++;
+ }
+ }
+
+ memcpy(&ctx->commands[ctx->ncommands], vals, nvals*sizeof(float));
+
+ ctx->ncommands += nvals;
+}
+
+
+static void nvg__clearPathCache(NVGcontext* ctx)
+{
+ ctx->cache->npoints = 0;
+ ctx->cache->npaths = 0;
+}
+
+static NVGpath* nvg__lastPath(NVGcontext* ctx)
+{
+ if (ctx->cache->npaths > 0)
+ return &ctx->cache->paths[ctx->cache->npaths-1];
+ return NULL;
+}
+
+static void nvg__addPath(NVGcontext* ctx)
+{
+ NVGpath* path;
+ if (ctx->cache->npaths+1 > ctx->cache->cpaths) {
+ NVGpath* paths;
+ int cpaths = ctx->cache->npaths+1 + ctx->cache->cpaths/2;
+ paths = (NVGpath*)realloc(ctx->cache->paths, sizeof(NVGpath)*cpaths);
+ if (paths == NULL) return;
+ ctx->cache->paths = paths;
+ ctx->cache->cpaths = cpaths;
+ }
+ path = &ctx->cache->paths[ctx->cache->npaths];
+ memset(path, 0, sizeof(*path));
+ path->first = ctx->cache->npoints;
+ path->winding = NVG_CCW;
+
+ ctx->cache->npaths++;
+}
+
+static NVGpoint* nvg__lastPoint(NVGcontext* ctx)
+{
+ if (ctx->cache->npoints > 0)
+ return &ctx->cache->points[ctx->cache->npoints-1];
+ return NULL;
+}
+
+static void nvg__addPoint(NVGcontext* ctx, float x, float y, int flags)
+{
+ NVGpath* path = nvg__lastPath(ctx);
+ NVGpoint* pt;
+ if (path == NULL) return;
+
+ if (path->count > 0 && ctx->cache->npoints > 0) {
+ pt = nvg__lastPoint(ctx);
+ if (nvg__ptEquals(pt->x,pt->y, x,y, ctx->distTol)) {
+ pt->flags |= flags;
+ return;
+ }
+ }
+
+ if (ctx->cache->npoints+1 > ctx->cache->cpoints) {
+ NVGpoint* points;
+ int cpoints = ctx->cache->npoints+1 + ctx->cache->cpoints/2;
+ points = (NVGpoint*)realloc(ctx->cache->points, sizeof(NVGpoint)*cpoints);
+ if (points == NULL) return;
+ ctx->cache->points = points;
+ ctx->cache->cpoints = cpoints;
+ }
+
+ pt = &ctx->cache->points[ctx->cache->npoints];
+ memset(pt, 0, sizeof(*pt));
+ pt->x = x;
+ pt->y = y;
+ pt->flags = (unsigned char)flags;
+
+ ctx->cache->npoints++;
+ path->count++;
+}
+
+static void nvg__closePath(NVGcontext* ctx)
+{
+ NVGpath* path = nvg__lastPath(ctx);
+ if (path == NULL) return;
+ path->closed = 1;
+}
+
+static void nvg__pathWinding(NVGcontext* ctx, int winding)
+{
+ NVGpath* path = nvg__lastPath(ctx);
+ if (path == NULL) return;
+ path->winding = winding;
+}
+
+static float nvg__getAverageScale(float *t)
+{
+ float sx = sqrtf(t[0]*t[0] + t[2]*t[2]);
+ float sy = sqrtf(t[1]*t[1] + t[3]*t[3]);
+ return (sx + sy) * 0.5f;
+}
+
+static NVGvertex* nvg__allocTempVerts(NVGcontext* ctx, int nverts)
+{
+ if (nverts > ctx->cache->cverts) {
+ NVGvertex* verts;
+ int cverts = (nverts + 0xff) & ~0xff; // Round up to prevent allocations when things change just slightly.
+ verts = (NVGvertex*)realloc(ctx->cache->verts, sizeof(NVGvertex)*cverts);
+ if (verts == NULL) return NULL;
+ ctx->cache->verts = verts;
+ ctx->cache->cverts = cverts;
+ }
+
+ return ctx->cache->verts;
+}
+
+static float nvg__triarea2(float ax, float ay, float bx, float by, float cx, float cy)
+{
+ float abx = bx - ax;
+ float aby = by - ay;
+ float acx = cx - ax;
+ float acy = cy - ay;
+ return acx*aby - abx*acy;
+}
+
+static float nvg__polyArea(NVGpoint* pts, int npts)
+{
+ int i;
+ float area = 0;
+ for (i = 2; i < npts; i++) {
+ NVGpoint* a = &pts[0];
+ NVGpoint* b = &pts[i-1];
+ NVGpoint* c = &pts[i];
+ area += nvg__triarea2(a->x,a->y, b->x,b->y, c->x,c->y);
+ }
+ return area * 0.5f;
+}
+
+static void nvg__polyReverse(NVGpoint* pts, int npts)
+{
+ NVGpoint tmp;
+ int i = 0, j = npts-1;
+ while (i < j) {
+ tmp = pts[i];
+ pts[i] = pts[j];
+ pts[j] = tmp;
+ i++;
+ j--;
+ }
+}
+
+
+static void nvg__vset(NVGvertex* vtx, float x, float y, float u, float v)
+{
+ vtx->x = x;
+ vtx->y = y;
+ vtx->u = u;
+ vtx->v = v;
+}
+
+static void nvg__tesselateBezier(NVGcontext* ctx,
+ float x1, float y1, float x2, float y2,
+ float x3, float y3, float x4, float y4,
+ int level, int type)
+{
+ float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234;
+ float dx,dy,d2,d3;
+
+ if (level > 10) return;
+
+ x12 = (x1+x2)*0.5f;
+ y12 = (y1+y2)*0.5f;
+ x23 = (x2+x3)*0.5f;
+ y23 = (y2+y3)*0.5f;
+ x34 = (x3+x4)*0.5f;
+ y34 = (y3+y4)*0.5f;
+ x123 = (x12+x23)*0.5f;
+ y123 = (y12+y23)*0.5f;
+
+ dx = x4 - x1;
+ dy = y4 - y1;
+ d2 = nvg__absf(((x2 - x4) * dy - (y2 - y4) * dx));
+ d3 = nvg__absf(((x3 - x4) * dy - (y3 - y4) * dx));
+
+ if ((d2 + d3)*(d2 + d3) < ctx->tessTol * (dx*dx + dy*dy)) {
+ nvg__addPoint(ctx, x4, y4, type);
+ return;
+ }
+
+/* if (nvg__absf(x1+x3-x2-x2) + nvg__absf(y1+y3-y2-y2) + nvg__absf(x2+x4-x3-x3) + nvg__absf(y2+y4-y3-y3) < ctx->tessTol) {
+ nvg__addPoint(ctx, x4, y4, type);
+ return;
+ }*/
+
+ x234 = (x23+x34)*0.5f;
+ y234 = (y23+y34)*0.5f;
+ x1234 = (x123+x234)*0.5f;
+ y1234 = (y123+y234)*0.5f;
+
+ nvg__tesselateBezier(ctx, x1,y1, x12,y12, x123,y123, x1234,y1234, level+1, 0);
+ nvg__tesselateBezier(ctx, x1234,y1234, x234,y234, x34,y34, x4,y4, level+1, type);
+}
+
+static void nvg__flattenPaths(NVGcontext* ctx)
+{
+ NVGpathCache* cache = ctx->cache;
+// NVGstate* state = nvg__getState(ctx);
+ NVGpoint* last;
+ NVGpoint* p0;
+ NVGpoint* p1;
+ NVGpoint* pts;
+ NVGpath* path;
+ int i, j;
+ float* cp1;
+ float* cp2;
+ float* p;
+ float area;
+
+ if (cache->npaths > 0)
+ return;
+
+ // Flatten
+ i = 0;
+ while (i < ctx->ncommands) {
+ int cmd = (int)ctx->commands[i];
+ switch (cmd) {
+ case NVG_MOVETO:
+ nvg__addPath(ctx);
+ p = &ctx->commands[i+1];
+ nvg__addPoint(ctx, p[0], p[1], NVG_PT_CORNER);
+ i += 3;
+ break;
+ case NVG_LINETO:
+ p = &ctx->commands[i+1];
+ nvg__addPoint(ctx, p[0], p[1], NVG_PT_CORNER);
+ i += 3;
+ break;
+ case NVG_BEZIERTO:
+ last = nvg__lastPoint(ctx);
+ if (last != NULL) {
+ cp1 = &ctx->commands[i+1];
+ cp2 = &ctx->commands[i+3];
+ p = &ctx->commands[i+5];
+ nvg__tesselateBezier(ctx, last->x,last->y, cp1[0],cp1[1], cp2[0],cp2[1], p[0],p[1], 0, NVG_PT_CORNER);
+ }
+ i += 7;
+ break;
+ case NVG_CLOSE:
+ nvg__closePath(ctx);
+ i++;
+ break;
+ case NVG_WINDING:
+ nvg__pathWinding(ctx, (int)ctx->commands[i+1]);
+ i += 2;
+ break;
+ default:
+ i++;
+ }
+ }
+
+ cache->bounds[0] = cache->bounds[1] = 1e6f;
+ cache->bounds[2] = cache->bounds[3] = -1e6f;
+
+ // Calculate the direction and length of line segments.
+ for (j = 0; j < cache->npaths; j++) {
+ path = &cache->paths[j];
+ pts = &cache->points[path->first];
+
+ // If the first and last points are the same, remove the last, mark as closed path.
+ p0 = &pts[path->count-1];
+ p1 = &pts[0];
+ if (nvg__ptEquals(p0->x,p0->y, p1->x,p1->y, ctx->distTol)) {
+ path->count--;
+ p0 = &pts[path->count-1];
+ path->closed = 1;
+ }
+
+ // Enforce winding.
+ if (path->count > 2) {
+ area = nvg__polyArea(pts, path->count);
+ if (path->winding == NVG_CCW && area < 0.0f)
+ nvg__polyReverse(pts, path->count);
+ if (path->winding == NVG_CW && area > 0.0f)
+ nvg__polyReverse(pts, path->count);
+ }
+
+ for(i = 0; i < path->count; i++) {
+ // Calculate segment direction and length
+ p0->dx = p1->x - p0->x;
+ p0->dy = p1->y - p0->y;
+ p0->len = nvg__normalize(&p0->dx, &p0->dy);
+ // Update bounds
+ cache->bounds[0] = nvg__minf(cache->bounds[0], p0->x);
+ cache->bounds[1] = nvg__minf(cache->bounds[1], p0->y);
+ cache->bounds[2] = nvg__maxf(cache->bounds[2], p0->x);
+ cache->bounds[3] = nvg__maxf(cache->bounds[3], p0->y);
+ // Advance
+ p0 = p1++;
+ }
+ }
+}
+
+static int nvg__curveDivs(float r, float arc, float tol)
+{
+ float da = acosf(r / (r + tol)) * 2.0f;
+ return nvg__maxi(2, (int)ceilf(arc / da));
+}
+
+static void nvg__chooseBevel(int bevel, NVGpoint* p0, NVGpoint* p1, float w,
+ float* x0, float* y0, float* x1, float* y1)
+{
+ if (bevel) {
+ *x0 = p1->x + p0->dy * w;
+ *y0 = p1->y - p0->dx * w;
+ *x1 = p1->x + p1->dy * w;
+ *y1 = p1->y - p1->dx * w;
+ } else {
+ *x0 = p1->x + p1->dmx * w;
+ *y0 = p1->y + p1->dmy * w;
+ *x1 = p1->x + p1->dmx * w;
+ *y1 = p1->y + p1->dmy * w;
+ }
+}
+
+static NVGvertex* nvg__roundJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1,
+ float lw, float rw, float lu, float ru, int ncap,
+ float fringe)
+{
+ int i, n;
+ float dlx0 = p0->dy;
+ float dly0 = -p0->dx;
+ float dlx1 = p1->dy;
+ float dly1 = -p1->dx;
+ NVG_NOTUSED(fringe);
+
+ if (p1->flags & NVG_PT_LEFT) {
+ float lx0,ly0,lx1,ly1,a0,a1;
+ nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1);
+ a0 = atan2f(-dly0, -dlx0);
+ a1 = atan2f(-dly1, -dlx1);
+ if (a1 > a0) a1 -= NVG_PI*2;
+
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+ n = nvg__clampi((int)ceilf(((a0 - a1) / NVG_PI) * ncap), 2, ncap);
+ for (i = 0; i < n; i++) {
+ float u = i/(float)(n-1);
+ float a = a0 + u*(a1-a0);
+ float rx = p1->x + cosf(a) * rw;
+ float ry = p1->y + sinf(a) * rw;
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ nvg__vset(dst, rx, ry, ru,1); dst++;
+ }
+
+ nvg__vset(dst, lx1, ly1, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+
+ } else {
+ float rx0,ry0,rx1,ry1,a0,a1;
+ nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1);
+ a0 = atan2f(dly0, dlx0);
+ a1 = atan2f(dly1, dlx1);
+ if (a1 < a0) a1 += NVG_PI*2;
+
+ nvg__vset(dst, p1->x + dlx0*rw, p1->y + dly0*rw, lu,1); dst++;
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+ n = nvg__clampi((int)ceilf(((a1 - a0) / NVG_PI) * ncap), 2, ncap);
+ for (i = 0; i < n; i++) {
+ float u = i/(float)(n-1);
+ float a = a0 + u*(a1-a0);
+ float lx = p1->x + cosf(a) * lw;
+ float ly = p1->y + sinf(a) * lw;
+ nvg__vset(dst, lx, ly, lu,1); dst++;
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ }
+
+ nvg__vset(dst, p1->x + dlx1*rw, p1->y + dly1*rw, lu,1); dst++;
+ nvg__vset(dst, rx1, ry1, ru,1); dst++;
+
+ }
+ return dst;
+}
+
+static NVGvertex* nvg__bevelJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1,
+ float lw, float rw, float lu, float ru, float fringe)
+{
+ float rx0,ry0,rx1,ry1;
+ float lx0,ly0,lx1,ly1;
+ float dlx0 = p0->dy;
+ float dly0 = -p0->dx;
+ float dlx1 = p1->dy;
+ float dly1 = -p1->dx;
+ NVG_NOTUSED(fringe);
+
+ if (p1->flags & NVG_PT_LEFT) {
+ nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1);
+
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+ if (p1->flags & NVG_PT_BEVEL) {
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+ nvg__vset(dst, lx1, ly1, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+ } else {
+ rx0 = p1->x - p1->dmx * rw;
+ ry0 = p1->y - p1->dmy * rw;
+
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+ }
+
+ nvg__vset(dst, lx1, ly1, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+
+ } else {
+ nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1);
+
+ nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++;
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+ if (p1->flags & NVG_PT_BEVEL) {
+ nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++;
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+ nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++;
+ nvg__vset(dst, rx1, ry1, ru,1); dst++;
+ } else {
+ lx0 = p1->x + p1->dmx * lw;
+ ly0 = p1->y + p1->dmy * lw;
+
+ nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++;
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+
+ nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++;
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ }
+
+ nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++;
+ nvg__vset(dst, rx1, ry1, ru,1); dst++;
+ }
+
+ return dst;
+}
+
+static NVGvertex* nvg__buttCapStart(NVGvertex* dst, NVGpoint* p,
+ float dx, float dy, float w, float d,
+ float aa, float u0, float u1)
+{
+ float px = p->x - dx*d;
+ float py = p->y - dy*d;
+ float dlx = dy;
+ float dly = -dx;
+ nvg__vset(dst, px + dlx*w - dx*aa, py + dly*w - dy*aa, u0,0); dst++;
+ nvg__vset(dst, px - dlx*w - dx*aa, py - dly*w - dy*aa, u1,0); dst++;
+ nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
+ nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
+ return dst;
+}
+
+static NVGvertex* nvg__buttCapEnd(NVGvertex* dst, NVGpoint* p,
+ float dx, float dy, float w, float d,
+ float aa, float u0, float u1)
+{
+ float px = p->x + dx*d;
+ float py = p->y + dy*d;
+ float dlx = dy;
+ float dly = -dx;
+ nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
+ nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
+ nvg__vset(dst, px + dlx*w + dx*aa, py + dly*w + dy*aa, u0,0); dst++;
+ nvg__vset(dst, px - dlx*w + dx*aa, py - dly*w + dy*aa, u1,0); dst++;
+ return dst;
+}
+
+
+static NVGvertex* nvg__roundCapStart(NVGvertex* dst, NVGpoint* p,
+ float dx, float dy, float w, int ncap,
+ float aa, float u0, float u1)
+{
+ int i;
+ float px = p->x;
+ float py = p->y;
+ float dlx = dy;
+ float dly = -dx;
+ NVG_NOTUSED(aa);
+ for (i = 0; i < ncap; i++) {
+ float a = i/(float)(ncap-1)*NVG_PI;
+ float ax = cosf(a) * w, ay = sinf(a) * w;
+ nvg__vset(dst, px - dlx*ax - dx*ay, py - dly*ax - dy*ay, u0,1); dst++;
+ nvg__vset(dst, px, py, 0.5f,1); dst++;
+ }
+ nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
+ nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
+ return dst;
+}
+
+static NVGvertex* nvg__roundCapEnd(NVGvertex* dst, NVGpoint* p,
+ float dx, float dy, float w, int ncap,
+ float aa, float u0, float u1)
+{
+ int i;
+ float px = p->x;
+ float py = p->y;
+ float dlx = dy;
+ float dly = -dx;
+ NVG_NOTUSED(aa);
+ nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
+ nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
+ for (i = 0; i < ncap; i++) {
+ float a = i/(float)(ncap-1)*NVG_PI;
+ float ax = cosf(a) * w, ay = sinf(a) * w;
+ nvg__vset(dst, px, py, 0.5f,1); dst++;
+ nvg__vset(dst, px - dlx*ax + dx*ay, py - dly*ax + dy*ay, u0,1); dst++;
+ }
+ return dst;
+}
+
+
+static void nvg__calculateJoins(NVGcontext* ctx, float w, int lineJoin, float miterLimit)
+{
+ NVGpathCache* cache = ctx->cache;
+ int i, j;
+ float iw = 0.0f;
+
+ if (w > 0.0f) iw = 1.0f / w;
+
+ // Calculate which joins needs extra vertices to append, and gather vertex count.
+ for (i = 0; i < cache->npaths; i++) {
+ NVGpath* path = &cache->paths[i];
+ NVGpoint* pts = &cache->points[path->first];
+ NVGpoint* p0 = &pts[path->count-1];
+ NVGpoint* p1 = &pts[0];
+ int nleft = 0;
+
+ path->nbevel = 0;
+
+ for (j = 0; j < path->count; j++) {
+ float dlx0, dly0, dlx1, dly1, dmr2, cross, limit;
+ dlx0 = p0->dy;
+ dly0 = -p0->dx;
+ dlx1 = p1->dy;
+ dly1 = -p1->dx;
+ // Calculate extrusions
+ p1->dmx = (dlx0 + dlx1) * 0.5f;
+ p1->dmy = (dly0 + dly1) * 0.5f;
+ dmr2 = p1->dmx*p1->dmx + p1->dmy*p1->dmy;
+ if (dmr2 > 0.000001f) {
+ float scale = 1.0f / dmr2;
+ if (scale > 600.0f) {
+ scale = 600.0f;
+ }
+ p1->dmx *= scale;
+ p1->dmy *= scale;
+ }
+
+ // Clear flags, but keep the corner.
+ p1->flags = (p1->flags & NVG_PT_CORNER) ? NVG_PT_CORNER : 0;
+
+ // Keep track of left turns.
+ cross = p1->dx * p0->dy - p0->dx * p1->dy;
+ if (cross > 0.0f) {
+ nleft++;
+ p1->flags |= NVG_PT_LEFT;
+ }
+
+ // Calculate if we should use bevel or miter for inner join.
+ limit = nvg__maxf(1.01f, nvg__minf(p0->len, p1->len) * iw);
+ if ((dmr2 * limit*limit) < 1.0f)
+ p1->flags |= NVG_PR_INNERBEVEL;
+
+ // Check to see if the corner needs to be beveled.
+ if (p1->flags & NVG_PT_CORNER) {
+ if ((dmr2 * miterLimit*miterLimit) < 1.0f || lineJoin == NVG_BEVEL || lineJoin == NVG_ROUND) {
+ p1->flags |= NVG_PT_BEVEL;
+ }
+ }
+
+ if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0)
+ path->nbevel++;
+
+ p0 = p1++;
+ }
+
+ path->convex = (nleft == path->count) ? 1 : 0;
+ }
+}
+
+
+static int nvg__expandStroke(NVGcontext* ctx, float w, float fringe, int lineCap, int lineJoin, float miterLimit)
+{
+ NVGpathCache* cache = ctx->cache;
+ NVGvertex* verts;
+ NVGvertex* dst;
+ int cverts, i, j;
+ float aa = fringe;//ctx->fringeWidth;
+ float u0 = 0.0f, u1 = 1.0f;
+ int ncap = nvg__curveDivs(w, NVG_PI, ctx->tessTol); // Calculate divisions per half circle.
+
+ w += aa * 0.5f;
+
+ // Disable the gradient used for antialiasing when antialiasing is not used.
+ if (aa == 0.0f) {
+ u0 = 0.5f;
+ u1 = 0.5f;
+ }
+
+ nvg__calculateJoins(ctx, w, lineJoin, miterLimit);
+
+ // Calculate max vertex usage.
+ cverts = 0;
+ for (i = 0; i < cache->npaths; i++) {
+ NVGpath* path = &cache->paths[i];
+ int loop = (path->closed == 0) ? 0 : 1;
+ if (lineJoin == NVG_ROUND)
+ cverts += (path->count + path->nbevel*(ncap+2) + 1) * 2; // plus one for loop
+ else
+ cverts += (path->count + path->nbevel*5 + 1) * 2; // plus one for loop
+ if (loop == 0) {
+ // space for caps
+ if (lineCap == NVG_ROUND) {
+ cverts += (ncap*2 + 2)*2;
+ } else {
+ cverts += (3+3)*2;
+ }
+ }
+ }
+
+ verts = nvg__allocTempVerts(ctx, cverts);
+ if (verts == NULL) return 0;
+
+ for (i = 0; i < cache->npaths; i++) {
+ NVGpath* path = &cache->paths[i];
+ NVGpoint* pts = &cache->points[path->first];
+ NVGpoint* p0;
+ NVGpoint* p1;
+ int s, e, loop;
+ float dx, dy;
+
+ path->fill = 0;
+ path->nfill = 0;
+
+ // Calculate fringe or stroke
+ loop = (path->closed == 0) ? 0 : 1;
+ dst = verts;
+ path->stroke = dst;
+
+ if (loop) {
+ // Looping
+ p0 = &pts[path->count-1];
+ p1 = &pts[0];
+ s = 0;
+ e = path->count;
+ } else {
+ // Add cap
+ p0 = &pts[0];
+ p1 = &pts[1];
+ s = 1;
+ e = path->count-1;
+ }
+
+ if (loop == 0) {
+ // Add cap
+ dx = p1->x - p0->x;
+ dy = p1->y - p0->y;
+ nvg__normalize(&dx, &dy);
+ if (lineCap == NVG_BUTT)
+ dst = nvg__buttCapStart(dst, p0, dx, dy, w, -aa*0.5f, aa, u0, u1);
+ else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE)
+ dst = nvg__buttCapStart(dst, p0, dx, dy, w, w-aa, aa, u0, u1);
+ else if (lineCap == NVG_ROUND)
+ dst = nvg__roundCapStart(dst, p0, dx, dy, w, ncap, aa, u0, u1);
+ }
+
+ for (j = s; j < e; ++j) {
+ if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) {
+ if (lineJoin == NVG_ROUND) {
+ dst = nvg__roundJoin(dst, p0, p1, w, w, u0, u1, ncap, aa);
+ } else {
+ dst = nvg__bevelJoin(dst, p0, p1, w, w, u0, u1, aa);
+ }
+ } else {
+ nvg__vset(dst, p1->x + (p1->dmx * w), p1->y + (p1->dmy * w), u0,1); dst++;
+ nvg__vset(dst, p1->x - (p1->dmx * w), p1->y - (p1->dmy * w), u1,1); dst++;
+ }
+ p0 = p1++;
+ }
+
+ if (loop) {
+ // Loop it
+ nvg__vset(dst, verts[0].x, verts[0].y, u0,1); dst++;
+ nvg__vset(dst, verts[1].x, verts[1].y, u1,1); dst++;
+ } else {
+ // Add cap
+ dx = p1->x - p0->x;
+ dy = p1->y - p0->y;
+ nvg__normalize(&dx, &dy);
+ if (lineCap == NVG_BUTT)
+ dst = nvg__buttCapEnd(dst, p1, dx, dy, w, -aa*0.5f, aa, u0, u1);
+ else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE)
+ dst = nvg__buttCapEnd(dst, p1, dx, dy, w, w-aa, aa, u0, u1);
+ else if (lineCap == NVG_ROUND)
+ dst = nvg__roundCapEnd(dst, p1, dx, dy, w, ncap, aa, u0, u1);
+ }
+
+ path->nstroke = (int)(dst - verts);
+
+ verts = dst;
+ }
+
+ return 1;
+}
+
+static int nvg__expandFill(NVGcontext* ctx, float w, int lineJoin, float miterLimit)
+{
+ NVGpathCache* cache = ctx->cache;
+ NVGvertex* verts;
+ NVGvertex* dst;
+ int cverts, convex, i, j;
+ float aa = ctx->fringeWidth;
+ int fringe = w > 0.0f;
+
+ nvg__calculateJoins(ctx, w, lineJoin, miterLimit);
+
+ // Calculate max vertex usage.
+ cverts = 0;
+ for (i = 0; i < cache->npaths; i++) {
+ NVGpath* path = &cache->paths[i];
+ cverts += path->count + path->nbevel + 1;
+ if (fringe)
+ cverts += (path->count + path->nbevel*5 + 1) * 2; // plus one for loop
+ }
+
+ verts = nvg__allocTempVerts(ctx, cverts);
+ if (verts == NULL) return 0;
+
+ convex = cache->npaths == 1 && cache->paths[0].convex;
+
+ for (i = 0; i < cache->npaths; i++) {
+ NVGpath* path = &cache->paths[i];
+ NVGpoint* pts = &cache->points[path->first];
+ NVGpoint* p0;
+ NVGpoint* p1;
+ float rw, lw, woff;
+ float ru, lu;
+
+ // Calculate shape vertices.
+ woff = 0.5f*aa;
+ dst = verts;
+ path->fill = dst;
+
+ if (fringe) {
+ // Looping
+ p0 = &pts[path->count-1];
+ p1 = &pts[0];
+ for (j = 0; j < path->count; ++j) {
+ if (p1->flags & NVG_PT_BEVEL) {
+ float dlx0 = p0->dy;
+ float dly0 = -p0->dx;
+ float dlx1 = p1->dy;
+ float dly1 = -p1->dx;
+ if (p1->flags & NVG_PT_LEFT) {
+ float lx = p1->x + p1->dmx * woff;
+ float ly = p1->y + p1->dmy * woff;
+ nvg__vset(dst, lx, ly, 0.5f,1); dst++;
+ } else {
+ float lx0 = p1->x + dlx0 * woff;
+ float ly0 = p1->y + dly0 * woff;
+ float lx1 = p1->x + dlx1 * woff;
+ float ly1 = p1->y + dly1 * woff;
+ nvg__vset(dst, lx0, ly0, 0.5f,1); dst++;
+ nvg__vset(dst, lx1, ly1, 0.5f,1); dst++;
+ }
+ } else {
+ nvg__vset(dst, p1->x + (p1->dmx * woff), p1->y + (p1->dmy * woff), 0.5f,1); dst++;
+ }
+ p0 = p1++;
+ }
+ } else {
+ for (j = 0; j < path->count; ++j) {
+ nvg__vset(dst, pts[j].x, pts[j].y, 0.5f,1);
+ dst++;
+ }
+ }
+
+ path->nfill = (int)(dst - verts);
+ verts = dst;
+
+ // Calculate fringe
+ if (fringe) {
+ lw = w + woff;
+ rw = w - woff;
+ lu = 0;
+ ru = 1;
+ dst = verts;
+ path->stroke = dst;
+
+ // Create only half a fringe for convex shapes so that
+ // the shape can be rendered without stenciling.
+ if (convex) {
+ lw = woff; // This should generate the same vertex as fill inset above.
+ lu = 0.5f; // Set outline fade at middle.
+ }
+
+ // Looping
+ p0 = &pts[path->count-1];
+ p1 = &pts[0];
+
+ for (j = 0; j < path->count; ++j) {
+ if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) {
+ dst = nvg__bevelJoin(dst, p0, p1, lw, rw, lu, ru, ctx->fringeWidth);
+ } else {
+ nvg__vset(dst, p1->x + (p1->dmx * lw), p1->y + (p1->dmy * lw), lu,1); dst++;
+ nvg__vset(dst, p1->x - (p1->dmx * rw), p1->y - (p1->dmy * rw), ru,1); dst++;
+ }
+ p0 = p1++;
+ }
+
+ // Loop it
+ nvg__vset(dst, verts[0].x, verts[0].y, lu,1); dst++;
+ nvg__vset(dst, verts[1].x, verts[1].y, ru,1); dst++;
+
+ path->nstroke = (int)(dst - verts);
+ verts = dst;
+ } else {
+ path->stroke = NULL;
+ path->nstroke = 0;
+ }
+ }
+
+ return 1;
+}
+
+
+// Draw
+void nvgBeginPath(NVGcontext* ctx)
+{
+ ctx->ncommands = 0;
+ nvg__clearPathCache(ctx);
+}
+
+void nvgMoveTo(NVGcontext* ctx, float x, float y)
+{
+ float vals[] = { NVG_MOVETO, x, y };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgLineTo(NVGcontext* ctx, float x, float y)
+{
+ float vals[] = { NVG_LINETO, x, y };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgBezierTo(NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y)
+{
+ float vals[] = { NVG_BEZIERTO, c1x, c1y, c2x, c2y, x, y };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y)
+{
+ float x0 = ctx->commandx;
+ float y0 = ctx->commandy;
+ float vals[] = { NVG_BEZIERTO,
+ x0 + 2.0f/3.0f*(cx - x0), y0 + 2.0f/3.0f*(cy - y0),
+ x + 2.0f/3.0f*(cx - x), y + 2.0f/3.0f*(cy - y),
+ x, y };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius)
+{
+ float x0 = ctx->commandx;
+ float y0 = ctx->commandy;
+ float dx0,dy0, dx1,dy1, a, d, cx,cy, a0,a1;
+ int dir;
+
+ if (ctx->ncommands == 0) {
+ return;
+ }
+
+ // Handle degenerate cases.
+ if (nvg__ptEquals(x0,y0, x1,y1, ctx->distTol) ||
+ nvg__ptEquals(x1,y1, x2,y2, ctx->distTol) ||
+ nvg__distPtSeg(x1,y1, x0,y0, x2,y2) < ctx->distTol*ctx->distTol ||
+ radius < ctx->distTol) {
+ nvgLineTo(ctx, x1,y1);
+ return;
+ }
+
+ // Calculate tangential circle to lines (x0,y0)-(x1,y1) and (x1,y1)-(x2,y2).
+ dx0 = x0-x1;
+ dy0 = y0-y1;
+ dx1 = x2-x1;
+ dy1 = y2-y1;
+ nvg__normalize(&dx0,&dy0);
+ nvg__normalize(&dx1,&dy1);
+ a = nvg__acosf(dx0*dx1 + dy0*dy1);
+ d = radius / nvg__tanf(a/2.0f);
+
+// printf("a=%f° d=%f\n", a/NVG_PI*180.0f, d);
+
+ if (d > 10000.0f) {
+ nvgLineTo(ctx, x1,y1);
+ return;
+ }
+
+ if (nvg__cross(dx0,dy0, dx1,dy1) > 0.0f) {
+ cx = x1 + dx0*d + dy0*radius;
+ cy = y1 + dy0*d + -dx0*radius;
+ a0 = nvg__atan2f(dx0, -dy0);
+ a1 = nvg__atan2f(-dx1, dy1);
+ dir = NVG_CW;
+// printf("CW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f);
+ } else {
+ cx = x1 + dx0*d + -dy0*radius;
+ cy = y1 + dy0*d + dx0*radius;
+ a0 = nvg__atan2f(-dx0, dy0);
+ a1 = nvg__atan2f(dx1, -dy1);
+ dir = NVG_CCW;
+// printf("CCW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f);
+ }
+
+ nvgArc(ctx, cx, cy, radius, a0, a1, dir);
+}
+
+void nvgClosePath(NVGcontext* ctx)
+{
+ float vals[] = { NVG_CLOSE };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgPathWinding(NVGcontext* ctx, int dir)
+{
+ float vals[] = { NVG_WINDING, (float)dir };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir)
+{
+ float a = 0, da = 0, hda = 0, kappa = 0;
+ float dx = 0, dy = 0, x = 0, y = 0, tanx = 0, tany = 0;
+ float px = 0, py = 0, ptanx = 0, ptany = 0;
+ float vals[3 + 5*7 + 100];
+ int i, ndivs, nvals;
+ int move = ctx->ncommands > 0 ? NVG_LINETO : NVG_MOVETO;
+
+ // Clamp angles
+ da = a1 - a0;
+ if (dir == NVG_CW) {
+ if (nvg__absf(da) >= NVG_PI*2) {
+ da = NVG_PI*2;
+ } else {
+ while (da < 0.0f) da += NVG_PI*2;
+ }
+ } else {
+ if (nvg__absf(da) >= NVG_PI*2) {
+ da = -NVG_PI*2;
+ } else {
+ while (da > 0.0f) da -= NVG_PI*2;
+ }
+ }
+
+ // Split arc into max 90 degree segments.
+ ndivs = nvg__maxi(1, nvg__mini((int)(nvg__absf(da) / (NVG_PI*0.5f) + 0.5f), 5));
+ hda = (da / (float)ndivs) / 2.0f;
+ kappa = nvg__absf(4.0f / 3.0f * (1.0f - nvg__cosf(hda)) / nvg__sinf(hda));
+
+ if (dir == NVG_CCW)
+ kappa = -kappa;
+
+ nvals = 0;
+ for (i = 0; i <= ndivs; i++) {
+ a = a0 + da * (i/(float)ndivs);
+ dx = nvg__cosf(a);
+ dy = nvg__sinf(a);
+ x = cx + dx*r;
+ y = cy + dy*r;
+ tanx = -dy*r*kappa;
+ tany = dx*r*kappa;
+
+ if (i == 0) {
+ vals[nvals++] = (float)move;
+ vals[nvals++] = x;
+ vals[nvals++] = y;
+ } else {
+ vals[nvals++] = NVG_BEZIERTO;
+ vals[nvals++] = px+ptanx;
+ vals[nvals++] = py+ptany;
+ vals[nvals++] = x-tanx;
+ vals[nvals++] = y-tany;
+ vals[nvals++] = x;
+ vals[nvals++] = y;
+ }
+ px = x;
+ py = y;
+ ptanx = tanx;
+ ptany = tany;
+ }
+
+ nvg__appendCommands(ctx, vals, nvals);
+}
+
+void nvgRect(NVGcontext* ctx, float x, float y, float w, float h)
+{
+ float vals[] = {
+ NVG_MOVETO, x,y,
+ NVG_LINETO, x,y+h,
+ NVG_LINETO, x+w,y+h,
+ NVG_LINETO, x+w,y,
+ NVG_CLOSE
+ };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r)
+{
+ nvgRoundedRectVarying(ctx, x, y, w, h, r, r, r, r);
+}
+
+void nvgRoundedRectVarying(NVGcontext* ctx, float x, float y, float w, float h, float radTopLeft, float radTopRight, float radBottomRight, float radBottomLeft)
+{
+ if(radTopLeft < 0.1f && radTopRight < 0.1f && radBottomRight < 0.1f && radBottomLeft < 0.1f) {
+ nvgRect(ctx, x, y, w, h);
+ return;
+ } else {
+ float halfw = nvg__absf(w)*0.5f;
+ float halfh = nvg__absf(h)*0.5f;
+ float rxBL = nvg__minf(radBottomLeft, halfw) * nvg__signf(w), ryBL = nvg__minf(radBottomLeft, halfh) * nvg__signf(h);
+ float rxBR = nvg__minf(radBottomRight, halfw) * nvg__signf(w), ryBR = nvg__minf(radBottomRight, halfh) * nvg__signf(h);
+ float rxTR = nvg__minf(radTopRight, halfw) * nvg__signf(w), ryTR = nvg__minf(radTopRight, halfh) * nvg__signf(h);
+ float rxTL = nvg__minf(radTopLeft, halfw) * nvg__signf(w), ryTL = nvg__minf(radTopLeft, halfh) * nvg__signf(h);
+ float vals[] = {
+ NVG_MOVETO, x, y + ryTL,
+ NVG_LINETO, x, y + h - ryBL,
+ NVG_BEZIERTO, x, y + h - ryBL*(1 - NVG_KAPPA90), x + rxBL*(1 - NVG_KAPPA90), y + h, x + rxBL, y + h,
+ NVG_LINETO, x + w - rxBR, y + h,
+ NVG_BEZIERTO, x + w - rxBR*(1 - NVG_KAPPA90), y + h, x + w, y + h - ryBR*(1 - NVG_KAPPA90), x + w, y + h - ryBR,
+ NVG_LINETO, x + w, y + ryTR,
+ NVG_BEZIERTO, x + w, y + ryTR*(1 - NVG_KAPPA90), x + w - rxTR*(1 - NVG_KAPPA90), y, x + w - rxTR, y,
+ NVG_LINETO, x + rxTL, y,
+ NVG_BEZIERTO, x + rxTL*(1 - NVG_KAPPA90), y, x, y + ryTL*(1 - NVG_KAPPA90), x, y + ryTL,
+ NVG_CLOSE
+ };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+ }
+}
+
+void nvgEllipse(NVGcontext* ctx, float cx, float cy, float rx, float ry)
+{
+ float vals[] = {
+ NVG_MOVETO, cx-rx, cy,
+ NVG_BEZIERTO, cx-rx, cy+ry*NVG_KAPPA90, cx-rx*NVG_KAPPA90, cy+ry, cx, cy+ry,
+ NVG_BEZIERTO, cx+rx*NVG_KAPPA90, cy+ry, cx+rx, cy+ry*NVG_KAPPA90, cx+rx, cy,
+ NVG_BEZIERTO, cx+rx, cy-ry*NVG_KAPPA90, cx+rx*NVG_KAPPA90, cy-ry, cx, cy-ry,
+ NVG_BEZIERTO, cx-rx*NVG_KAPPA90, cy-ry, cx-rx, cy-ry*NVG_KAPPA90, cx-rx, cy,
+ NVG_CLOSE
+ };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgCircle(NVGcontext* ctx, float cx, float cy, float r)
+{
+ nvgEllipse(ctx, cx,cy, r,r);
+}
+
+void nvgDebugDumpPathCache(NVGcontext* ctx)
+{
+ const NVGpath* path;
+ int i, j;
+
+ printf("Dumping %d cached paths\n", ctx->cache->npaths);
+ for (i = 0; i < ctx->cache->npaths; i++) {
+ path = &ctx->cache->paths[i];
+ printf(" - Path %d\n", i);
+ if (path->nfill) {
+ printf(" - fill: %d\n", path->nfill);
+ for (j = 0; j < path->nfill; j++)
+ printf("%f\t%f\n", path->fill[j].x, path->fill[j].y);
+ }
+ if (path->nstroke) {
+ printf(" - stroke: %d\n", path->nstroke);
+ for (j = 0; j < path->nstroke; j++)
+ printf("%f\t%f\n", path->stroke[j].x, path->stroke[j].y);
+ }
+ }
+}
+
+void nvgFill(NVGcontext* ctx)
+{
+ NVGstate* state = nvg__getState(ctx);
+ const NVGpath* path;
+ NVGpaint fillPaint = state->fill;
+ int i;
+
+ nvg__flattenPaths(ctx);
+ if (ctx->params.edgeAntiAlias && state->shapeAntiAlias)
+ nvg__expandFill(ctx, ctx->fringeWidth, NVG_MITER, 2.4f);
+ else
+ nvg__expandFill(ctx, 0.0f, NVG_MITER, 2.4f);
+
+ // Apply global alpha
+ fillPaint.innerColor.a *= state->alpha;
+ fillPaint.outerColor.a *= state->alpha;
+
+ ctx->params.renderFill(ctx->params.userPtr, &fillPaint, state->compositeOperation, &state->scissor, ctx->fringeWidth,
+ ctx->cache->bounds, ctx->cache->paths, ctx->cache->npaths);
+
+ // Count triangles
+ for (i = 0; i < ctx->cache->npaths; i++) {
+ path = &ctx->cache->paths[i];
+ ctx->fillTriCount += path->nfill-2;
+ ctx->fillTriCount += path->nstroke-2;
+ ctx->drawCallCount += 2;
+ }
+}
+
+void nvgStroke(NVGcontext* ctx)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getAverageScale(state->xform);
+ float strokeWidth = nvg__clampf(state->strokeWidth * scale, 0.0f, 200.0f);
+ NVGpaint strokePaint = state->stroke;
+ const NVGpath* path;
+ int i;
+
+
+ if (strokeWidth < ctx->fringeWidth) {
+ // If the stroke width is less than pixel size, use alpha to emulate coverage.
+ // Since coverage is area, scale by alpha*alpha.
+ float alpha = nvg__clampf(strokeWidth / ctx->fringeWidth, 0.0f, 1.0f);
+ strokePaint.innerColor.a *= alpha*alpha;
+ strokePaint.outerColor.a *= alpha*alpha;
+ strokeWidth = ctx->fringeWidth;
+ }
+
+ // Apply global alpha
+ strokePaint.innerColor.a *= state->alpha;
+ strokePaint.outerColor.a *= state->alpha;
+
+ nvg__flattenPaths(ctx);
+
+ if (ctx->params.edgeAntiAlias && state->shapeAntiAlias)
+ nvg__expandStroke(ctx, strokeWidth*0.5f, ctx->fringeWidth, state->lineCap, state->lineJoin, state->miterLimit);
+ else
+ nvg__expandStroke(ctx, strokeWidth*0.5f, 0.0f, state->lineCap, state->lineJoin, state->miterLimit);
+
+ ctx->params.renderStroke(ctx->params.userPtr, &strokePaint, state->compositeOperation, &state->scissor, ctx->fringeWidth,
+ strokeWidth, ctx->cache->paths, ctx->cache->npaths);
+
+ // Count triangles
+ for (i = 0; i < ctx->cache->npaths; i++) {
+ path = &ctx->cache->paths[i];
+ ctx->strokeTriCount += path->nstroke-2;
+ ctx->drawCallCount++;
+ }
+}
+
+// Add fonts
+int nvgCreateFont(NVGcontext* ctx, const char* name, const char* path)
+{
+ return fonsAddFont(ctx->fs, name, path);
+}
+
+int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData)
+{
+ return fonsAddFontMem(ctx->fs, name, data, ndata, freeData);
+}
+
+int nvgFindFont(NVGcontext* ctx, const char* name)
+{
+ if (name == NULL) return -1;
+ return fonsGetFontByName(ctx->fs, name);
+}
+
+
+int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont)
+{
+ if(baseFont == -1 || fallbackFont == -1) return 0;
+ return fonsAddFallbackFont(ctx->fs, baseFont, fallbackFont);
+}
+
+int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont)
+{
+ return nvgAddFallbackFontId(ctx, nvgFindFont(ctx, baseFont), nvgFindFont(ctx, fallbackFont));
+}
+
+// State setting
+void nvgFontSize(NVGcontext* ctx, float size)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->fontSize = size;
+}
+
+void nvgFontBlur(NVGcontext* ctx, float blur)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->fontBlur = blur;
+}
+
+void nvgTextLetterSpacing(NVGcontext* ctx, float spacing)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->letterSpacing = spacing;
+}
+
+void nvgTextLineHeight(NVGcontext* ctx, float lineHeight)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->lineHeight = lineHeight;
+}
+
+void nvgTextAlign(NVGcontext* ctx, int align)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->textAlign = align;
+}
+
+void nvgFontFaceId(NVGcontext* ctx, int font)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->fontId = font;
+}
+
+void nvgFontFace(NVGcontext* ctx, const char* font)
+{
+ NVGstate* state = nvg__getState(ctx);
+ state->fontId = fonsGetFontByName(ctx->fs, font);
+}
+
+static float nvg__quantize(float a, float d)
+{
+ return ((int)(a / d + 0.5f)) * d;
+}
+
+static float nvg__getFontScale(NVGstate* state)
+{
+ return nvg__minf(nvg__quantize(nvg__getAverageScale(state->xform), 0.01f), 4.0f);
+}
+
+static void nvg__flushTextTexture(NVGcontext* ctx)
+{
+ int dirty[4];
+
+ if (fonsValidateTexture(ctx->fs, dirty)) {
+ int fontImage = ctx->fontImages[ctx->fontImageIdx];
+ // Update texture
+ if (fontImage != 0) {
+ int iw, ih;
+ const unsigned char* data = fonsGetTextureData(ctx->fs, &iw, &ih);
+ int x = dirty[0];
+ int y = dirty[1];
+ int w = dirty[2] - dirty[0];
+ int h = dirty[3] - dirty[1];
+ ctx->params.renderUpdateTexture(ctx->params.userPtr, fontImage, x,y, w,h, data);
+ }
+ }
+}
+
+static int nvg__allocTextAtlas(NVGcontext* ctx)
+{
+ int iw, ih;
+ nvg__flushTextTexture(ctx);
+ if (ctx->fontImageIdx >= NVG_MAX_FONTIMAGES-1)
+ return 0;
+ // if next fontImage already have a texture
+ if (ctx->fontImages[ctx->fontImageIdx+1] != 0)
+ nvgImageSize(ctx, ctx->fontImages[ctx->fontImageIdx+1], &iw, &ih);
+ else { // calculate the new font image size and create it.
+ nvgImageSize(ctx, ctx->fontImages[ctx->fontImageIdx], &iw, &ih);
+ if (iw > ih)
+ ih *= 2;
+ else
+ iw *= 2;
+ if (iw > NVG_MAX_FONTIMAGE_SIZE || ih > NVG_MAX_FONTIMAGE_SIZE)
+ iw = ih = NVG_MAX_FONTIMAGE_SIZE;
+ ctx->fontImages[ctx->fontImageIdx+1] = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, iw, ih, 0, NULL);
+ }
+ ++ctx->fontImageIdx;
+ fonsResetAtlas(ctx->fs, iw, ih);
+ return 1;
+}
+
+static void nvg__renderText(NVGcontext* ctx, NVGvertex* verts, int nverts)
+{
+ NVGstate* state = nvg__getState(ctx);
+ NVGpaint paint = state->fill;
+
+ // Render triangles.
+ paint.image = ctx->fontImages[ctx->fontImageIdx];
+
+ // Apply global alpha
+ paint.innerColor.a *= state->alpha;
+ paint.outerColor.a *= state->alpha;
+
+ ctx->params.renderTriangles(ctx->params.userPtr, &paint, state->compositeOperation, &state->scissor, verts, nverts);
+
+ ctx->drawCallCount++;
+ ctx->textTriCount += nverts/3;
+}
+
+float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char* end)
+{
+ NVGstate* state = nvg__getState(ctx);
+ FONStextIter iter, prevIter;
+ FONSquad q;
+ NVGvertex* verts;
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ int cverts = 0;
+ int nverts = 0;
+
+ if (end == NULL)
+ end = string + strlen(string);
+
+ if (state->fontId == FONS_INVALID) return x;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ cverts = nvg__maxi(2, (int)(end - string)) * 6; // conservative estimate.
+ verts = nvg__allocTempVerts(ctx, cverts);
+ if (verts == NULL) return x;
+
+ fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end, FONS_GLYPH_BITMAP_REQUIRED);
+ prevIter = iter;
+ while (fonsTextIterNext(ctx->fs, &iter, &q)) {
+ float c[4*2];
+ if (iter.prevGlyphIndex == -1) { // can not retrieve glyph?
+ if (nverts != 0) {
+ nvg__renderText(ctx, verts, nverts);
+ nverts = 0;
+ }
+ if (!nvg__allocTextAtlas(ctx))
+ break; // no memory :(
+ iter = prevIter;
+ fonsTextIterNext(ctx->fs, &iter, &q); // try again
+ if (iter.prevGlyphIndex == -1) // still can not find glyph?
+ break;
+ }
+ prevIter = iter;
+ // Transform corners.
+ nvgTransformPoint(&c[0],&c[1], state->xform, q.x0*invscale, q.y0*invscale);
+ nvgTransformPoint(&c[2],&c[3], state->xform, q.x1*invscale, q.y0*invscale);
+ nvgTransformPoint(&c[4],&c[5], state->xform, q.x1*invscale, q.y1*invscale);
+ nvgTransformPoint(&c[6],&c[7], state->xform, q.x0*invscale, q.y1*invscale);
+ // Create triangles
+ if (nverts+6 <= cverts) {
+ nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++;
+ nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++;
+ nvg__vset(&verts[nverts], c[2], c[3], q.s1, q.t0); nverts++;
+ nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++;
+ nvg__vset(&verts[nverts], c[6], c[7], q.s0, q.t1); nverts++;
+ nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++;
+ }
+ }
+
+ // TODO: add back-end bit to do this just once per frame.
+ nvg__flushTextTexture(ctx);
+
+ nvg__renderText(ctx, verts, nverts);
+
+ return iter.nextx / scale;
+}
+
+void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end)
+{
+ NVGstate* state = nvg__getState(ctx);
+ NVGtextRow rows[2];
+ int nrows = 0, i;
+ int oldAlign = state->textAlign;
+ int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT);
+ int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE);
+ float lineh = 0;
+
+ if (state->fontId == FONS_INVALID) return;
+
+ nvgTextMetrics(ctx, NULL, NULL, &lineh);
+
+ state->textAlign = NVG_ALIGN_LEFT | valign;
+
+ while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) {
+ for (i = 0; i < nrows; i++) {
+ NVGtextRow* row = &rows[i];
+ if (haling & NVG_ALIGN_LEFT)
+ nvgText(ctx, x, y, row->start, row->end);
+ else if (haling & NVG_ALIGN_CENTER)
+ nvgText(ctx, x + breakRowWidth*0.5f - row->width*0.5f, y, row->start, row->end);
+ else if (haling & NVG_ALIGN_RIGHT)
+ nvgText(ctx, x + breakRowWidth - row->width, y, row->start, row->end);
+ y += lineh * state->lineHeight;
+ }
+ string = rows[nrows-1].next;
+ }
+
+ state->textAlign = oldAlign;
+}
+
+int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string, const char* end, NVGglyphPosition* positions, int maxPositions)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ FONStextIter iter, prevIter;
+ FONSquad q;
+ int npos = 0;
+
+ if (state->fontId == FONS_INVALID) return 0;
+
+ if (end == NULL)
+ end = string + strlen(string);
+
+ if (string == end)
+ return 0;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end, FONS_GLYPH_BITMAP_OPTIONAL);
+ prevIter = iter;
+ while (fonsTextIterNext(ctx->fs, &iter, &q)) {
+ if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph?
+ iter = prevIter;
+ fonsTextIterNext(ctx->fs, &iter, &q); // try again
+ }
+ prevIter = iter;
+ positions[npos].str = iter.str;
+ positions[npos].x = iter.x * invscale;
+ positions[npos].minx = nvg__minf(iter.x, q.x0) * invscale;
+ positions[npos].maxx = nvg__maxf(iter.nextx, q.x1) * invscale;
+ npos++;
+ if (npos >= maxPositions)
+ break;
+ }
+
+ return npos;
+}
+
+enum NVGcodepointType {
+ NVG_SPACE,
+ NVG_NEWLINE,
+ NVG_CHAR,
+ NVG_CJK_CHAR,
+};
+
+int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, NVGtextRow* rows, int maxRows)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ FONStextIter iter, prevIter;
+ FONSquad q;
+ int nrows = 0;
+ float rowStartX = 0;
+ float rowWidth = 0;
+ float rowMinX = 0;
+ float rowMaxX = 0;
+ const char* rowStart = NULL;
+ const char* rowEnd = NULL;
+ const char* wordStart = NULL;
+ float wordStartX = 0;
+ float wordMinX = 0;
+ const char* breakEnd = NULL;
+ float breakWidth = 0;
+ float breakMaxX = 0;
+ int type = NVG_SPACE, ptype = NVG_SPACE;
+ unsigned int pcodepoint = 0;
+
+ if (maxRows == 0) return 0;
+ if (state->fontId == FONS_INVALID) return 0;
+
+ if (end == NULL)
+ end = string + strlen(string);
+
+ if (string == end) return 0;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ breakRowWidth *= scale;
+
+ fonsTextIterInit(ctx->fs, &iter, 0, 0, string, end, FONS_GLYPH_BITMAP_OPTIONAL);
+ prevIter = iter;
+ while (fonsTextIterNext(ctx->fs, &iter, &q)) {
+ if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph?
+ iter = prevIter;
+ fonsTextIterNext(ctx->fs, &iter, &q); // try again
+ }
+ prevIter = iter;
+ switch (iter.codepoint) {
+ case 9: // \t
+ case 11: // \v
+ case 12: // \f
+ case 32: // space
+ case 0x00a0: // NBSP
+ type = NVG_SPACE;
+ break;
+ case 10: // \n
+ type = pcodepoint == 13 ? NVG_SPACE : NVG_NEWLINE;
+ break;
+ case 13: // \r
+ type = pcodepoint == 10 ? NVG_SPACE : NVG_NEWLINE;
+ break;
+ case 0x0085: // NEL
+ type = NVG_NEWLINE;
+ break;
+ default:
+ if ((iter.codepoint >= 0x4E00 && iter.codepoint <= 0x9FFF) ||
+ (iter.codepoint >= 0x3000 && iter.codepoint <= 0x30FF) ||
+ (iter.codepoint >= 0xFF00 && iter.codepoint <= 0xFFEF) ||
+ (iter.codepoint >= 0x1100 && iter.codepoint <= 0x11FF) ||
+ (iter.codepoint >= 0x3130 && iter.codepoint <= 0x318F) ||
+ (iter.codepoint >= 0xAC00 && iter.codepoint <= 0xD7AF))
+ type = NVG_CJK_CHAR;
+ else
+ type = NVG_CHAR;
+ break;
+ }
+
+ if (type == NVG_NEWLINE) {
+ // Always handle new lines.
+ rows[nrows].start = rowStart != NULL ? rowStart : iter.str;
+ rows[nrows].end = rowEnd != NULL ? rowEnd : iter.str;
+ rows[nrows].width = rowWidth * invscale;
+ rows[nrows].minx = rowMinX * invscale;
+ rows[nrows].maxx = rowMaxX * invscale;
+ rows[nrows].next = iter.next;
+ nrows++;
+ if (nrows >= maxRows)
+ return nrows;
+ // Set null break point
+ breakEnd = rowStart;
+ breakWidth = 0.0;
+ breakMaxX = 0.0;
+ // Indicate to skip the white space at the beginning of the row.
+ rowStart = NULL;
+ rowEnd = NULL;
+ rowWidth = 0;
+ rowMinX = rowMaxX = 0;
+ } else {
+ if (rowStart == NULL) {
+ // Skip white space until the beginning of the line
+ if (type == NVG_CHAR || type == NVG_CJK_CHAR) {
+ // The current char is the row so far
+ rowStartX = iter.x;
+ rowStart = iter.str;
+ rowEnd = iter.next;
+ rowWidth = iter.nextx - rowStartX; // q.x1 - rowStartX;
+ rowMinX = q.x0 - rowStartX;
+ rowMaxX = q.x1 - rowStartX;
+ wordStart = iter.str;
+ wordStartX = iter.x;
+ wordMinX = q.x0 - rowStartX;
+ // Set null break point
+ breakEnd = rowStart;
+ breakWidth = 0.0;
+ breakMaxX = 0.0;
+ }
+ } else {
+ float nextWidth = iter.nextx - rowStartX;
+
+ // track last non-white space character
+ if (type == NVG_CHAR || type == NVG_CJK_CHAR) {
+ rowEnd = iter.next;
+ rowWidth = iter.nextx - rowStartX;
+ rowMaxX = q.x1 - rowStartX;
+ }
+ // track last end of a word
+ if (((ptype == NVG_CHAR || ptype == NVG_CJK_CHAR) && type == NVG_SPACE) || type == NVG_CJK_CHAR) {
+ breakEnd = iter.str;
+ breakWidth = rowWidth;
+ breakMaxX = rowMaxX;
+ }
+ // track last beginning of a word
+ if ((ptype == NVG_SPACE && (type == NVG_CHAR || type == NVG_CJK_CHAR)) || type == NVG_CJK_CHAR) {
+ wordStart = iter.str;
+ wordStartX = iter.x;
+ wordMinX = q.x0 - rowStartX;
+ }
+
+ // Break to new line when a character is beyond break width.
+ if ((type == NVG_CHAR || type == NVG_CJK_CHAR) && nextWidth > breakRowWidth) {
+ // The run length is too long, need to break to new line.
+ if (breakEnd == rowStart) {
+ // The current word is longer than the row length, just break it from here.
+ rows[nrows].start = rowStart;
+ rows[nrows].end = iter.str;
+ rows[nrows].width = rowWidth * invscale;
+ rows[nrows].minx = rowMinX * invscale;
+ rows[nrows].maxx = rowMaxX * invscale;
+ rows[nrows].next = iter.str;
+ nrows++;
+ if (nrows >= maxRows)
+ return nrows;
+ rowStartX = iter.x;
+ rowStart = iter.str;
+ rowEnd = iter.next;
+ rowWidth = iter.nextx - rowStartX;
+ rowMinX = q.x0 - rowStartX;
+ rowMaxX = q.x1 - rowStartX;
+ wordStart = iter.str;
+ wordStartX = iter.x;
+ wordMinX = q.x0 - rowStartX;
+ } else {
+ // Break the line from the end of the last word, and start new line from the beginning of the new.
+ rows[nrows].start = rowStart;
+ rows[nrows].end = breakEnd;
+ rows[nrows].width = breakWidth * invscale;
+ rows[nrows].minx = rowMinX * invscale;
+ rows[nrows].maxx = breakMaxX * invscale;
+ rows[nrows].next = wordStart;
+ nrows++;
+ if (nrows >= maxRows)
+ return nrows;
+ rowStartX = wordStartX;
+ rowStart = wordStart;
+ rowEnd = iter.next;
+ rowWidth = iter.nextx - rowStartX;
+ rowMinX = wordMinX;
+ rowMaxX = q.x1 - rowStartX;
+ // No change to the word start
+ }
+ // Set null break point
+ breakEnd = rowStart;
+ breakWidth = 0.0;
+ breakMaxX = 0.0;
+ }
+ }
+ }
+
+ pcodepoint = iter.codepoint;
+ ptype = type;
+ }
+
+ // Break the line from the end of the last word, and start new line from the beginning of the new.
+ if (rowStart != NULL) {
+ rows[nrows].start = rowStart;
+ rows[nrows].end = rowEnd;
+ rows[nrows].width = rowWidth * invscale;
+ rows[nrows].minx = rowMinX * invscale;
+ rows[nrows].maxx = rowMaxX * invscale;
+ rows[nrows].next = end;
+ nrows++;
+ }
+
+ return nrows;
+}
+
+float nvgTextBounds(NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ float width;
+
+ if (state->fontId == FONS_INVALID) return 0;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ width = fonsTextBounds(ctx->fs, x*scale, y*scale, string, end, bounds);
+ if (bounds != NULL) {
+ // Use line bounds for height.
+ fonsLineBounds(ctx->fs, y*scale, &bounds[1], &bounds[3]);
+ bounds[0] *= invscale;
+ bounds[1] *= invscale;
+ bounds[2] *= invscale;
+ bounds[3] *= invscale;
+ }
+ return width * invscale;
+}
+
+void nvgTextBoxBounds(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds)
+{
+ NVGstate* state = nvg__getState(ctx);
+ NVGtextRow rows[2];
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ int nrows = 0, i;
+ int oldAlign = state->textAlign;
+ int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT);
+ int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE);
+ float lineh = 0, rminy = 0, rmaxy = 0;
+ float minx, miny, maxx, maxy;
+
+ if (state->fontId == FONS_INVALID) {
+ if (bounds != NULL)
+ bounds[0] = bounds[1] = bounds[2] = bounds[3] = 0.0f;
+ return;
+ }
+
+ nvgTextMetrics(ctx, NULL, NULL, &lineh);
+
+ state->textAlign = NVG_ALIGN_LEFT | valign;
+
+ minx = maxx = x;
+ miny = maxy = y;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+ fonsLineBounds(ctx->fs, 0, &rminy, &rmaxy);
+ rminy *= invscale;
+ rmaxy *= invscale;
+
+ while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) {
+ for (i = 0; i < nrows; i++) {
+ NVGtextRow* row = &rows[i];
+ float rminx, rmaxx, dx = 0;
+ // Horizontal bounds
+ if (haling & NVG_ALIGN_LEFT)
+ dx = 0;
+ else if (haling & NVG_ALIGN_CENTER)
+ dx = breakRowWidth*0.5f - row->width*0.5f;
+ else if (haling & NVG_ALIGN_RIGHT)
+ dx = breakRowWidth - row->width;
+ rminx = x + row->minx + dx;
+ rmaxx = x + row->maxx + dx;
+ minx = nvg__minf(minx, rminx);
+ maxx = nvg__maxf(maxx, rmaxx);
+ // Vertical bounds.
+ miny = nvg__minf(miny, y + rminy);
+ maxy = nvg__maxf(maxy, y + rmaxy);
+
+ y += lineh * state->lineHeight;
+ }
+ string = rows[nrows-1].next;
+ }
+
+ state->textAlign = oldAlign;
+
+ if (bounds != NULL) {
+ bounds[0] = minx;
+ bounds[1] = miny;
+ bounds[2] = maxx;
+ bounds[3] = maxy;
+ }
+}
+
+void nvgTextMetrics(NVGcontext* ctx, float* ascender, float* descender, float* lineh)
+{
+ NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+
+ if (state->fontId == FONS_INVALID) return;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ fonsVertMetrics(ctx->fs, ascender, descender, lineh);
+ if (ascender != NULL)
+ *ascender *= invscale;
+ if (descender != NULL)
+ *descender *= invscale;
+ if (lineh != NULL)
+ *lineh *= invscale;
+}
+// vim: ft=c nu noet ts=4
diff --git a/deps/nanovg/nanovg.h b/deps/nanovg/nanovg.h
@@ -0,0 +1,685 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would be
+// appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+// misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#ifndef NANOVG_H
+#define NANOVG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NVG_PI 3.14159265358979323846264338327f
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4201) // nonstandard extension used : nameless struct/union
+#endif
+
+typedef struct NVGcontext NVGcontext;
+
+struct NVGcolor {
+ union {
+ float rgba[4];
+ struct {
+ float r,g,b,a;
+ };
+ };
+};
+typedef struct NVGcolor NVGcolor;
+
+struct NVGpaint {
+ float xform[6];
+ float extent[2];
+ float radius;
+ float feather;
+ NVGcolor innerColor;
+ NVGcolor outerColor;
+ int image;
+};
+typedef struct NVGpaint NVGpaint;
+
+enum NVGwinding {
+ NVG_CCW = 1, // Winding for solid shapes
+ NVG_CW = 2, // Winding for holes
+};
+
+enum NVGsolidity {
+ NVG_SOLID = 1, // CCW
+ NVG_HOLE = 2, // CW
+};
+
+enum NVGlineCap {
+ NVG_BUTT,
+ NVG_ROUND,
+ NVG_SQUARE,
+ NVG_BEVEL,
+ NVG_MITER,
+};
+
+enum NVGalign {
+ // Horizontal align
+ NVG_ALIGN_LEFT = 1<<0, // Default, align text horizontally to left.
+ NVG_ALIGN_CENTER = 1<<1, // Align text horizontally to center.
+ NVG_ALIGN_RIGHT = 1<<2, // Align text horizontally to right.
+ // Vertical align
+ NVG_ALIGN_TOP = 1<<3, // Align text vertically to top.
+ NVG_ALIGN_MIDDLE = 1<<4, // Align text vertically to middle.
+ NVG_ALIGN_BOTTOM = 1<<5, // Align text vertically to bottom.
+ NVG_ALIGN_BASELINE = 1<<6, // Default, align text vertically to baseline.
+};
+
+enum NVGblendFactor {
+ NVG_ZERO = 1<<0,
+ NVG_ONE = 1<<1,
+ NVG_SRC_COLOR = 1<<2,
+ NVG_ONE_MINUS_SRC_COLOR = 1<<3,
+ NVG_DST_COLOR = 1<<4,
+ NVG_ONE_MINUS_DST_COLOR = 1<<5,
+ NVG_SRC_ALPHA = 1<<6,
+ NVG_ONE_MINUS_SRC_ALPHA = 1<<7,
+ NVG_DST_ALPHA = 1<<8,
+ NVG_ONE_MINUS_DST_ALPHA = 1<<9,
+ NVG_SRC_ALPHA_SATURATE = 1<<10,
+};
+
+enum NVGcompositeOperation {
+ NVG_SOURCE_OVER,
+ NVG_SOURCE_IN,
+ NVG_SOURCE_OUT,
+ NVG_ATOP,
+ NVG_DESTINATION_OVER,
+ NVG_DESTINATION_IN,
+ NVG_DESTINATION_OUT,
+ NVG_DESTINATION_ATOP,
+ NVG_LIGHTER,
+ NVG_COPY,
+ NVG_XOR,
+};
+
+struct NVGcompositeOperationState {
+ int srcRGB;
+ int dstRGB;
+ int srcAlpha;
+ int dstAlpha;
+};
+typedef struct NVGcompositeOperationState NVGcompositeOperationState;
+
+struct NVGglyphPosition {
+ const char* str; // Position of the glyph in the input string.
+ float x; // The x-coordinate of the logical glyph position.
+ float minx, maxx; // The bounds of the glyph shape.
+};
+typedef struct NVGglyphPosition NVGglyphPosition;
+
+struct NVGtextRow {
+ const char* start; // Pointer to the input text where the row starts.
+ const char* end; // Pointer to the input text where the row ends (one past the last character).
+ const char* next; // Pointer to the beginning of the next row.
+ float width; // Logical width of the row.
+ float minx, maxx; // Actual bounds of the row. Logical with and bounds can differ because of kerning and some parts over extending.
+};
+typedef struct NVGtextRow NVGtextRow;
+
+enum NVGimageFlags {
+ NVG_IMAGE_GENERATE_MIPMAPS = 1<<0, // Generate mipmaps during creation of the image.
+ NVG_IMAGE_REPEATX = 1<<1, // Repeat image in X direction.
+ NVG_IMAGE_REPEATY = 1<<2, // Repeat image in Y direction.
+ NVG_IMAGE_FLIPY = 1<<3, // Flips (inverses) image in Y direction when rendered.
+ NVG_IMAGE_PREMULTIPLIED = 1<<4, // Image data has premultiplied alpha.
+ NVG_IMAGE_NEAREST = 1<<5, // Image interpolation is Nearest instead Linear
+};
+
+// Begin drawing a new frame
+// Calls to nanovg drawing API should be wrapped in nvgBeginFrame() & nvgEndFrame()
+// nvgBeginFrame() defines the size of the window to render to in relation currently
+// set viewport (i.e. glViewport on GL backends). Device pixel ration allows to
+// control the rendering on Hi-DPI devices.
+// For example, GLFW returns two dimension for an opened window: window size and
+// frame buffer size. In that case you would set windowWidth/Height to the window size
+// devicePixelRatio to: frameBufferWidth / windowWidth.
+void nvgBeginFrame(NVGcontext* ctx, float windowWidth, float windowHeight, float devicePixelRatio);
+
+// Cancels drawing the current frame.
+void nvgCancelFrame(NVGcontext* ctx);
+
+// Ends drawing flushing remaining render state.
+void nvgEndFrame(NVGcontext* ctx);
+
+//
+// Composite operation
+//
+// The composite operations in NanoVG are modeled after HTML Canvas API, and
+// the blend func is based on OpenGL (see corresponding manuals for more info).
+// The colors in the blending state have premultiplied alpha.
+
+// Sets the composite operation. The op parameter should be one of NVGcompositeOperation.
+void nvgGlobalCompositeOperation(NVGcontext* ctx, int op);
+
+// Sets the composite operation with custom pixel arithmetic. The parameters should be one of NVGblendFactor.
+void nvgGlobalCompositeBlendFunc(NVGcontext* ctx, int sfactor, int dfactor);
+
+// Sets the composite operation with custom pixel arithmetic for RGB and alpha components separately. The parameters should be one of NVGblendFactor.
+void nvgGlobalCompositeBlendFuncSeparate(NVGcontext* ctx, int srcRGB, int dstRGB, int srcAlpha, int dstAlpha);
+
+//
+// Color utils
+//
+// Colors in NanoVG are stored as unsigned ints in ABGR format.
+
+// Returns a color value from red, green, blue values. Alpha will be set to 255 (1.0f).
+NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b);
+
+// Returns a color value from red, green, blue values. Alpha will be set to 1.0f.
+NVGcolor nvgRGBf(float r, float g, float b);
+
+
+// Returns a color value from red, green, blue and alpha values.
+NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a);
+
+// Returns a color value from red, green, blue and alpha values.
+NVGcolor nvgRGBAf(float r, float g, float b, float a);
+
+
+// Linearly interpolates from color c0 to c1, and returns resulting color value.
+NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u);
+
+// Sets transparency of a color value.
+NVGcolor nvgTransRGBA(NVGcolor c0, unsigned char a);
+
+// Sets transparency of a color value.
+NVGcolor nvgTransRGBAf(NVGcolor c0, float a);
+
+// Returns color value specified by hue, saturation and lightness.
+// HSL values are all in range [0..1], alpha will be set to 255.
+NVGcolor nvgHSL(float h, float s, float l);
+
+// Returns color value specified by hue, saturation and lightness and alpha.
+// HSL values are all in range [0..1], alpha in range [0..255]
+NVGcolor nvgHSLA(float h, float s, float l, unsigned char a);
+
+//
+// State Handling
+//
+// NanoVG contains state which represents how paths will be rendered.
+// The state contains transform, fill and stroke styles, text and font styles,
+// and scissor clipping.
+
+// Pushes and saves the current render state into a state stack.
+// A matching nvgRestore() must be used to restore the state.
+void nvgSave(NVGcontext* ctx);
+
+// Pops and restores current render state.
+void nvgRestore(NVGcontext* ctx);
+
+// Resets current render state to default values. Does not affect the render state stack.
+void nvgReset(NVGcontext* ctx);
+
+//
+// Render styles
+//
+// Fill and stroke render style can be either a solid color or a paint which is a gradient or a pattern.
+// Solid color is simply defined as a color value, different kinds of paints can be created
+// using nvgLinearGradient(), nvgBoxGradient(), nvgRadialGradient() and nvgImagePattern().
+//
+// Current render style can be saved and restored using nvgSave() and nvgRestore().
+
+// Sets whether to draw antialias for nvgStroke() and nvgFill(). It's enabled by default.
+void nvgShapeAntiAlias(NVGcontext* ctx, int enabled);
+
+// Sets current stroke style to a solid color.
+void nvgStrokeColor(NVGcontext* ctx, NVGcolor color);
+
+// Sets current stroke style to a paint, which can be a one of the gradients or a pattern.
+void nvgStrokePaint(NVGcontext* ctx, NVGpaint paint);
+
+// Sets current fill style to a solid color.
+void nvgFillColor(NVGcontext* ctx, NVGcolor color);
+
+// Sets current fill style to a paint, which can be a one of the gradients or a pattern.
+void nvgFillPaint(NVGcontext* ctx, NVGpaint paint);
+
+// Sets the miter limit of the stroke style.
+// Miter limit controls when a sharp corner is beveled.
+void nvgMiterLimit(NVGcontext* ctx, float limit);
+
+// Sets the stroke width of the stroke style.
+void nvgStrokeWidth(NVGcontext* ctx, float size);
+
+// Sets how the end of the line (cap) is drawn,
+// Can be one of: NVG_BUTT (default), NVG_ROUND, NVG_SQUARE.
+void nvgLineCap(NVGcontext* ctx, int cap);
+
+// Sets how sharp path corners are drawn.
+// Can be one of NVG_MITER (default), NVG_ROUND, NVG_BEVEL.
+void nvgLineJoin(NVGcontext* ctx, int join);
+
+// Sets the transparency applied to all rendered shapes.
+// Already transparent paths will get proportionally more transparent as well.
+void nvgGlobalAlpha(NVGcontext* ctx, float alpha);
+
+//
+// Transforms
+//
+// The paths, gradients, patterns and scissor region are transformed by an transformation
+// matrix at the time when they are passed to the API.
+// The current transformation matrix is a affine matrix:
+// [sx kx tx]
+// [ky sy ty]
+// [ 0 0 1]
+// Where: sx,sy define scaling, kx,ky skewing, and tx,ty translation.
+// The last row is assumed to be 0,0,1 and is not stored.
+//
+// Apart from nvgResetTransform(), each transformation function first creates
+// specific transformation matrix and pre-multiplies the current transformation by it.
+//
+// Current coordinate system (transformation) can be saved and restored using nvgSave() and nvgRestore().
+
+// Resets current transform to a identity matrix.
+void nvgResetTransform(NVGcontext* ctx);
+
+// Premultiplies current coordinate system by specified matrix.
+// The parameters are interpreted as matrix as follows:
+// [a c e]
+// [b d f]
+// [0 0 1]
+void nvgTransform(NVGcontext* ctx, float a, float b, float c, float d, float e, float f);
+
+// Translates current coordinate system.
+void nvgTranslate(NVGcontext* ctx, float x, float y);
+
+// Rotates current coordinate system. Angle is specified in radians.
+void nvgRotate(NVGcontext* ctx, float angle);
+
+// Skews the current coordinate system along X axis. Angle is specified in radians.
+void nvgSkewX(NVGcontext* ctx, float angle);
+
+// Skews the current coordinate system along Y axis. Angle is specified in radians.
+void nvgSkewY(NVGcontext* ctx, float angle);
+
+// Scales the current coordinate system.
+void nvgScale(NVGcontext* ctx, float x, float y);
+
+// Stores the top part (a-f) of the current transformation matrix in to the specified buffer.
+// [a c e]
+// [b d f]
+// [0 0 1]
+// There should be space for 6 floats in the return buffer for the values a-f.
+void nvgCurrentTransform(NVGcontext* ctx, float* xform);
+
+
+// The following functions can be used to make calculations on 2x3 transformation matrices.
+// A 2x3 matrix is represented as float[6].
+
+// Sets the transform to identity matrix.
+void nvgTransformIdentity(float* dst);
+
+// Sets the transform to translation matrix matrix.
+void nvgTransformTranslate(float* dst, float tx, float ty);
+
+// Sets the transform to scale matrix.
+void nvgTransformScale(float* dst, float sx, float sy);
+
+// Sets the transform to rotate matrix. Angle is specified in radians.
+void nvgTransformRotate(float* dst, float a);
+
+// Sets the transform to skew-x matrix. Angle is specified in radians.
+void nvgTransformSkewX(float* dst, float a);
+
+// Sets the transform to skew-y matrix. Angle is specified in radians.
+void nvgTransformSkewY(float* dst, float a);
+
+// Sets the transform to the result of multiplication of two transforms, of A = A*B.
+void nvgTransformMultiply(float* dst, const float* src);
+
+// Sets the transform to the result of multiplication of two transforms, of A = B*A.
+void nvgTransformPremultiply(float* dst, const float* src);
+
+// Sets the destination to inverse of specified transform.
+// Returns 1 if the inverse could be calculated, else 0.
+int nvgTransformInverse(float* dst, const float* src);
+
+// Transform a point by given transform.
+void nvgTransformPoint(float* dstx, float* dsty, const float* xform, float srcx, float srcy);
+
+// Converts degrees to radians and vice versa.
+float nvgDegToRad(float deg);
+float nvgRadToDeg(float rad);
+
+//
+// Images
+//
+// NanoVG allows you to load jpg, png, psd, tga, pic and gif files to be used for rendering.
+// In addition you can upload your own image. The image loading is provided by stb_image.
+// The parameter imageFlags is combination of flags defined in NVGimageFlags.
+
+// Creates image by loading it from the disk from specified file name.
+// Returns handle to the image.
+int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags);
+
+// Creates image by loading it from the specified chunk of memory.
+// Returns handle to the image.
+int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, unsigned char* data, int ndata);
+
+// Creates image from specified image data.
+// Returns handle to the image.
+int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data);
+
+// Updates image data specified by image handle.
+void nvgUpdateImage(NVGcontext* ctx, int image, const unsigned char* data);
+
+// Returns the dimensions of a created image.
+void nvgImageSize(NVGcontext* ctx, int image, int* w, int* h);
+
+// Deletes created image.
+void nvgDeleteImage(NVGcontext* ctx, int image);
+
+//
+// Paints
+//
+// NanoVG supports four types of paints: linear gradient, box gradient, radial gradient and image pattern.
+// These can be used as paints for strokes and fills.
+
+// Creates and returns a linear gradient. Parameters (sx,sy)-(ex,ey) specify the start and end coordinates
+// of the linear gradient, icol specifies the start color and ocol the end color.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+NVGpaint nvgLinearGradient(NVGcontext* ctx, float sx, float sy, float ex, float ey,
+ NVGcolor icol, NVGcolor ocol);
+
+// Creates and returns a box gradient. Box gradient is a feathered rounded rectangle, it is useful for rendering
+// drop shadows or highlights for boxes. Parameters (x,y) define the top-left corner of the rectangle,
+// (w,h) define the size of the rectangle, r defines the corner radius, and f feather. Feather defines how blurry
+// the border of the rectangle is. Parameter icol specifies the inner color and ocol the outer color of the gradient.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+NVGpaint nvgBoxGradient(NVGcontext* ctx, float x, float y, float w, float h,
+ float r, float f, NVGcolor icol, NVGcolor ocol);
+
+// Creates and returns a radial gradient. Parameters (cx,cy) specify the center, inr and outr specify
+// the inner and outer radius of the gradient, icol specifies the start color and ocol the end color.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+NVGpaint nvgRadialGradient(NVGcontext* ctx, float cx, float cy, float inr, float outr,
+ NVGcolor icol, NVGcolor ocol);
+
+// Creates and returns an image patter. Parameters (ox,oy) specify the left-top location of the image pattern,
+// (ex,ey) the size of one image, angle rotation around the top-left corner, image is handle to the image to render.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+NVGpaint nvgImagePattern(NVGcontext* ctx, float ox, float oy, float ex, float ey,
+ float angle, int image, float alpha);
+
+//
+// Scissoring
+//
+// Scissoring allows you to clip the rendering into a rectangle. This is useful for various
+// user interface cases like rendering a text edit or a timeline.
+
+// Sets the current scissor rectangle.
+// The scissor rectangle is transformed by the current transform.
+void nvgScissor(NVGcontext* ctx, float x, float y, float w, float h);
+
+// Intersects current scissor rectangle with the specified rectangle.
+// The scissor rectangle is transformed by the current transform.
+// Note: in case the rotation of previous scissor rect differs from
+// the current one, the intersection will be done between the specified
+// rectangle and the previous scissor rectangle transformed in the current
+// transform space. The resulting shape is always rectangle.
+void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h);
+
+// Reset and disables scissoring.
+void nvgResetScissor(NVGcontext* ctx);
+
+//
+// Paths
+//
+// Drawing a new shape starts with nvgBeginPath(), it clears all the currently defined paths.
+// Then you define one or more paths and sub-paths which describe the shape. The are functions
+// to draw common shapes like rectangles and circles, and lower level step-by-step functions,
+// which allow to define a path curve by curve.
+//
+// NanoVG uses even-odd fill rule to draw the shapes. Solid shapes should have counter clockwise
+// winding and holes should have counter clockwise order. To specify winding of a path you can
+// call nvgPathWinding(). This is useful especially for the common shapes, which are drawn CCW.
+//
+// Finally you can fill the path using current fill style by calling nvgFill(), and stroke it
+// with current stroke style by calling nvgStroke().
+//
+// The curve segments and sub-paths are transformed by the current transform.
+
+// Clears the current path and sub-paths.
+void nvgBeginPath(NVGcontext* ctx);
+
+// Starts new sub-path with specified point as first point.
+void nvgMoveTo(NVGcontext* ctx, float x, float y);
+
+// Adds line segment from the last point in the path to the specified point.
+void nvgLineTo(NVGcontext* ctx, float x, float y);
+
+// Adds cubic bezier segment from last point in the path via two control points to the specified point.
+void nvgBezierTo(NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y);
+
+// Adds quadratic bezier segment from last point in the path via a control point to the specified point.
+void nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y);
+
+// Adds an arc segment at the corner defined by the last path point, and two specified points.
+void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius);
+
+// Closes current sub-path with a line segment.
+void nvgClosePath(NVGcontext* ctx);
+
+// Sets the current sub-path winding, see NVGwinding and NVGsolidity.
+void nvgPathWinding(NVGcontext* ctx, int dir);
+
+// Creates new circle arc shaped sub-path. The arc center is at cx,cy, the arc radius is r,
+// and the arc is drawn from angle a0 to a1, and swept in direction dir (NVG_CCW, or NVG_CW).
+// Angles are specified in radians.
+void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir);
+
+// Creates new rectangle shaped sub-path.
+void nvgRect(NVGcontext* ctx, float x, float y, float w, float h);
+
+// Creates new rounded rectangle shaped sub-path.
+void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r);
+
+// Creates new rounded rectangle shaped sub-path with varying radii for each corner.
+void nvgRoundedRectVarying(NVGcontext* ctx, float x, float y, float w, float h, float radTopLeft, float radTopRight, float radBottomRight, float radBottomLeft);
+
+// Creates new ellipse shaped sub-path.
+void nvgEllipse(NVGcontext* ctx, float cx, float cy, float rx, float ry);
+
+// Creates new circle shaped sub-path.
+void nvgCircle(NVGcontext* ctx, float cx, float cy, float r);
+
+// Fills the current path with current fill style.
+void nvgFill(NVGcontext* ctx);
+
+// Fills the current path with current stroke style.
+void nvgStroke(NVGcontext* ctx);
+
+
+//
+// Text
+//
+// NanoVG allows you to load .ttf files and use the font to render text.
+//
+// The appearance of the text can be defined by setting the current text style
+// and by specifying the fill color. Common text and font settings such as
+// font size, letter spacing and text align are supported. Font blur allows you
+// to create simple text effects such as drop shadows.
+//
+// At render time the font face can be set based on the font handles or name.
+//
+// Font measure functions return values in local space, the calculations are
+// carried in the same resolution as the final rendering. This is done because
+// the text glyph positions are snapped to the nearest pixels sharp rendering.
+//
+// The local space means that values are not rotated or scale as per the current
+// transformation. For example if you set font size to 12, which would mean that
+// line height is 16, then regardless of the current scaling and rotation, the
+// returned line height is always 16. Some measures may vary because of the scaling
+// since aforementioned pixel snapping.
+//
+// While this may sound a little odd, the setup allows you to always render the
+// same way regardless of scaling. I.e. following works regardless of scaling:
+//
+// const char* txt = "Text me up.";
+// nvgTextBounds(vg, x,y, txt, NULL, bounds);
+// nvgBeginPath(vg);
+// nvgRoundedRect(vg, bounds[0],bounds[1], bounds[2]-bounds[0], bounds[3]-bounds[1]);
+// nvgFill(vg);
+//
+// Note: currently only solid color fill is supported for text.
+
+// Creates font by loading it from the disk from specified file name.
+// Returns handle to the font.
+int nvgCreateFont(NVGcontext* ctx, const char* name, const char* filename);
+
+// Creates font by loading it from the specified memory chunk.
+// Returns handle to the font.
+int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData);
+
+// Finds a loaded font of specified name, and returns handle to it, or -1 if the font is not found.
+int nvgFindFont(NVGcontext* ctx, const char* name);
+
+// Adds a fallback font by handle.
+int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont);
+
+// Adds a fallback font by name.
+int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont);
+
+// Sets the font size of current text style.
+void nvgFontSize(NVGcontext* ctx, float size);
+
+// Sets the blur of current text style.
+void nvgFontBlur(NVGcontext* ctx, float blur);
+
+// Sets the letter spacing of current text style.
+void nvgTextLetterSpacing(NVGcontext* ctx, float spacing);
+
+// Sets the proportional line height of current text style. The line height is specified as multiple of font size.
+void nvgTextLineHeight(NVGcontext* ctx, float lineHeight);
+
+// Sets the text align of current text style, see NVGalign for options.
+void nvgTextAlign(NVGcontext* ctx, int align);
+
+// Sets the font face based on specified id of current text style.
+void nvgFontFaceId(NVGcontext* ctx, int font);
+
+// Sets the font face based on specified name of current text style.
+void nvgFontFace(NVGcontext* ctx, const char* font);
+
+// Draws text string at specified location. If end is specified only the sub-string up to the end is drawn.
+float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char* end);
+
+// Draws multi-line text string at specified location wrapped at the specified width. If end is specified only the sub-string up to the end is drawn.
+// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
+// Words longer than the max width are slit at nearest character (i.e. no hyphenation).
+void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end);
+
+// Measures the specified text string. Parameter bounds should be a pointer to float[4],
+// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
+// Returns the horizontal advance of the measured text (i.e. where the next character should drawn).
+// Measured values are returned in local coordinate space.
+float nvgTextBounds(NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds);
+
+// Measures the specified multi-text string. Parameter bounds should be a pointer to float[4],
+// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
+// Measured values are returned in local coordinate space.
+void nvgTextBoxBounds(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds);
+
+// Calculates the glyph x positions of the specified text. If end is specified only the sub-string will be used.
+// Measured values are returned in local coordinate space.
+int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string, const char* end, NVGglyphPosition* positions, int maxPositions);
+
+// Returns the vertical metrics based on the current text style.
+// Measured values are returned in local coordinate space.
+void nvgTextMetrics(NVGcontext* ctx, float* ascender, float* descender, float* lineh);
+
+// Breaks the specified text into lines. If end is specified only the sub-string will be used.
+// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
+// Words longer than the max width are slit at nearest character (i.e. no hyphenation).
+int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, NVGtextRow* rows, int maxRows);
+
+//
+// Internal Render API
+//
+enum NVGtexture {
+ NVG_TEXTURE_ALPHA = 0x01,
+ NVG_TEXTURE_RGBA = 0x02,
+};
+
+struct NVGscissor {
+ float xform[6];
+ float extent[2];
+};
+typedef struct NVGscissor NVGscissor;
+
+struct NVGvertex {
+ float x,y,u,v;
+};
+typedef struct NVGvertex NVGvertex;
+
+struct NVGpath {
+ int first;
+ int count;
+ unsigned char closed;
+ int nbevel;
+ NVGvertex* fill;
+ int nfill;
+ NVGvertex* stroke;
+ int nstroke;
+ int winding;
+ int convex;
+};
+typedef struct NVGpath NVGpath;
+
+struct NVGparams {
+ void* userPtr;
+ int edgeAntiAlias;
+ int (*renderCreate)(void* uptr);
+ int (*renderCreateTexture)(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data);
+ int (*renderDeleteTexture)(void* uptr, int image);
+ int (*renderUpdateTexture)(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data);
+ int (*renderGetTextureSize)(void* uptr, int image, int* w, int* h);
+ void (*renderViewport)(void* uptr, float width, float height, float devicePixelRatio);
+ void (*renderCancel)(void* uptr);
+ void (*renderFlush)(void* uptr);
+ void (*renderFill)(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe, const float* bounds, const NVGpath* paths, int npaths);
+ void (*renderStroke)(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe, float strokeWidth, const NVGpath* paths, int npaths);
+ void (*renderTriangles)(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, const NVGvertex* verts, int nverts);
+ void (*renderDelete)(void* uptr);
+};
+typedef struct NVGparams NVGparams;
+
+// Constructor and destructor, called by the render back-end.
+NVGcontext* nvgCreateInternal(NVGparams* params);
+void nvgDeleteInternal(NVGcontext* ctx);
+
+NVGparams* nvgInternalParams(NVGcontext* ctx);
+
+// Debug function to dump cached path data.
+void nvgDebugDumpPathCache(NVGcontext* ctx);
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
+#define NVG_NOTUSED(v) for (;;) { (void)(1 ? (void)0 : ( (void)(v) ) ); break; }
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NANOVG_H
diff --git a/deps/nanovg/nanovg_gl.h b/deps/nanovg/nanovg_gl.h
@@ -0,0 +1,1649 @@
+//
+// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would be
+// appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+// misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+#ifndef NANOVG_GL_H
+#define NANOVG_GL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Create flags
+
+enum NVGcreateFlags {
+ // Flag indicating if geometry based anti-aliasing is used (may not be needed when using MSAA).
+ NVG_ANTIALIAS = 1<<0,
+ // Flag indicating if strokes should be drawn using stencil buffer. The rendering will be a little
+ // slower, but path overlaps (i.e. self-intersecting or sharp turns) will be drawn just once.
+ NVG_STENCIL_STROKES = 1<<1,
+ // Flag indicating that additional debug checks are done.
+ NVG_DEBUG = 1<<2,
+};
+
+#if defined NANOVG_GL2_IMPLEMENTATION
+# define NANOVG_GL2 1
+# define NANOVG_GL_IMPLEMENTATION 1
+#elif defined NANOVG_GL3_IMPLEMENTATION
+# define NANOVG_GL3 1
+# define NANOVG_GL_IMPLEMENTATION 1
+# define NANOVG_GL_USE_UNIFORMBUFFER 1
+#elif defined NANOVG_GLES2_IMPLEMENTATION
+# define NANOVG_GLES2 1
+# define NANOVG_GL_IMPLEMENTATION 1
+#elif defined NANOVG_GLES3_IMPLEMENTATION
+# define NANOVG_GLES3 1
+# define NANOVG_GL_IMPLEMENTATION 1
+#endif
+
+#define NANOVG_GL_USE_STATE_FILTER (1)
+
+// Creates NanoVG contexts for different OpenGL (ES) versions.
+// Flags should be combination of the create flags above.
+
+#if defined NANOVG_GL2
+
+NVGcontext* nvgCreateGL2(int flags);
+void nvgDeleteGL2(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGL2(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGL2(NVGcontext* ctx, int image);
+
+#endif
+
+#if defined NANOVG_GL3
+
+NVGcontext* nvgCreateGL3(int flags);
+void nvgDeleteGL3(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGL3(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGL3(NVGcontext* ctx, int image);
+
+#endif
+
+#if defined NANOVG_GLES2
+
+NVGcontext* nvgCreateGLES2(int flags);
+void nvgDeleteGLES2(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGLES2(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGLES2(NVGcontext* ctx, int image);
+
+#endif
+
+#if defined NANOVG_GLES3
+
+NVGcontext* nvgCreateGLES3(int flags);
+void nvgDeleteGLES3(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGLES3(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGLES3(NVGcontext* ctx, int image);
+
+#endif
+
+// These are additional flags on top of NVGimageFlags.
+enum NVGimageFlagsGL {
+ NVG_IMAGE_NODELETE = 1<<16, // Do not delete GL texture handle.
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NANOVG_GL_H */
+
+#ifdef NANOVG_GL_IMPLEMENTATION
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include "nanovg.h"
+
+enum GLNVGuniformLoc {
+ GLNVG_LOC_VIEWSIZE,
+ GLNVG_LOC_TEX,
+ GLNVG_LOC_FRAG,
+ GLNVG_MAX_LOCS
+};
+
+enum GLNVGshaderType {
+ NSVG_SHADER_FILLGRAD,
+ NSVG_SHADER_FILLIMG,
+ NSVG_SHADER_SIMPLE,
+ NSVG_SHADER_IMG
+};
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+enum GLNVGuniformBindings {
+ GLNVG_FRAG_BINDING = 0,
+};
+#endif
+
+struct GLNVGshader {
+ GLuint prog;
+ GLuint frag;
+ GLuint vert;
+ GLint loc[GLNVG_MAX_LOCS];
+};
+typedef struct GLNVGshader GLNVGshader;
+
+struct GLNVGtexture {
+ int id;
+ GLuint tex;
+ int width, height;
+ int type;
+ int flags;
+};
+typedef struct GLNVGtexture GLNVGtexture;
+
+struct GLNVGblend
+{
+ GLenum srcRGB;
+ GLenum dstRGB;
+ GLenum srcAlpha;
+ GLenum dstAlpha;
+};
+typedef struct GLNVGblend GLNVGblend;
+
+enum GLNVGcallType {
+ GLNVG_NONE = 0,
+ GLNVG_FILL,
+ GLNVG_CONVEXFILL,
+ GLNVG_STROKE,
+ GLNVG_TRIANGLES,
+};
+
+struct GLNVGcall {
+ int type;
+ int image;
+ int pathOffset;
+ int pathCount;
+ int triangleOffset;
+ int triangleCount;
+ int uniformOffset;
+ GLNVGblend blendFunc;
+};
+typedef struct GLNVGcall GLNVGcall;
+
+struct GLNVGpath {
+ int fillOffset;
+ int fillCount;
+ int strokeOffset;
+ int strokeCount;
+};
+typedef struct GLNVGpath GLNVGpath;
+
+struct GLNVGfragUniforms {
+ #if NANOVG_GL_USE_UNIFORMBUFFER
+ float scissorMat[12]; // matrices are actually 3 vec4s
+ float paintMat[12];
+ struct NVGcolor innerCol;
+ struct NVGcolor outerCol;
+ float scissorExt[2];
+ float scissorScale[2];
+ float extent[2];
+ float radius;
+ float feather;
+ float strokeMult;
+ float strokeThr;
+ int texType;
+ int type;
+ #else
+ // note: after modifying layout or size of uniform array,
+ // don't forget to also update the fragment shader source!
+ #define NANOVG_GL_UNIFORMARRAY_SIZE 11
+ union {
+ struct {
+ float scissorMat[12]; // matrices are actually 3 vec4s
+ float paintMat[12];
+ struct NVGcolor innerCol;
+ struct NVGcolor outerCol;
+ float scissorExt[2];
+ float scissorScale[2];
+ float extent[2];
+ float radius;
+ float feather;
+ float strokeMult;
+ float strokeThr;
+ float texType;
+ float type;
+ };
+ float uniformArray[NANOVG_GL_UNIFORMARRAY_SIZE][4];
+ };
+ #endif
+};
+typedef struct GLNVGfragUniforms GLNVGfragUniforms;
+
+struct GLNVGcontext {
+ GLNVGshader shader;
+ GLNVGtexture* textures;
+ float view[2];
+ int ntextures;
+ int ctextures;
+ int textureId;
+ GLuint vertBuf;
+#if defined NANOVG_GL3
+ GLuint vertArr;
+#endif
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ GLuint fragBuf;
+#endif
+ int fragSize;
+ int flags;
+
+ // Per frame buffers
+ GLNVGcall* calls;
+ int ccalls;
+ int ncalls;
+ GLNVGpath* paths;
+ int cpaths;
+ int npaths;
+ struct NVGvertex* verts;
+ int cverts;
+ int nverts;
+ unsigned char* uniforms;
+ int cuniforms;
+ int nuniforms;
+
+ // cached state
+ #if NANOVG_GL_USE_STATE_FILTER
+ GLuint boundTexture;
+ GLuint stencilMask;
+ GLenum stencilFunc;
+ GLint stencilFuncRef;
+ GLuint stencilFuncMask;
+ GLNVGblend blendFunc;
+ #endif
+};
+typedef struct GLNVGcontext GLNVGcontext;
+
+static int glnvg__maxi(int a, int b) { return a > b ? a : b; }
+
+#ifdef NANOVG_GLES2
+static unsigned int glnvg__nearestPow2(unsigned int num)
+{
+ unsigned n = num > 0 ? num - 1 : 0;
+ n |= n >> 1;
+ n |= n >> 2;
+ n |= n >> 4;
+ n |= n >> 8;
+ n |= n >> 16;
+ n++;
+ return n;
+}
+#endif
+
+static void glnvg__bindTexture(GLNVGcontext* gl, GLuint tex)
+{
+#if NANOVG_GL_USE_STATE_FILTER
+ if (gl->boundTexture != tex) {
+ gl->boundTexture = tex;
+ glBindTexture(GL_TEXTURE_2D, tex);
+ }
+#else
+ glBindTexture(GL_TEXTURE_2D, tex);
+#endif
+}
+
+static void glnvg__stencilMask(GLNVGcontext* gl, GLuint mask)
+{
+#if NANOVG_GL_USE_STATE_FILTER
+ if (gl->stencilMask != mask) {
+ gl->stencilMask = mask;
+ glStencilMask(mask);
+ }
+#else
+ glStencilMask(mask);
+#endif
+}
+
+static void glnvg__stencilFunc(GLNVGcontext* gl, GLenum func, GLint ref, GLuint mask)
+{
+#if NANOVG_GL_USE_STATE_FILTER
+ if ((gl->stencilFunc != func) ||
+ (gl->stencilFuncRef != ref) ||
+ (gl->stencilFuncMask != mask)) {
+
+ gl->stencilFunc = func;
+ gl->stencilFuncRef = ref;
+ gl->stencilFuncMask = mask;
+ glStencilFunc(func, ref, mask);
+ }
+#else
+ glStencilFunc(func, ref, mask);
+#endif
+}
+static void glnvg__blendFuncSeparate(GLNVGcontext* gl, const GLNVGblend* blend)
+{
+#if NANOVG_GL_USE_STATE_FILTER
+ if ((gl->blendFunc.srcRGB != blend->srcRGB) ||
+ (gl->blendFunc.dstRGB != blend->dstRGB) ||
+ (gl->blendFunc.srcAlpha != blend->srcAlpha) ||
+ (gl->blendFunc.dstAlpha != blend->dstAlpha)) {
+
+ gl->blendFunc = *blend;
+ glBlendFuncSeparate(blend->srcRGB, blend->dstRGB, blend->srcAlpha,blend->dstAlpha);
+ }
+#else
+ glBlendFuncSeparate(blend->srcRGB, blend->dstRGB, blend->srcAlpha,blend->dstAlpha);
+#endif
+}
+
+static GLNVGtexture* glnvg__allocTexture(GLNVGcontext* gl)
+{
+ GLNVGtexture* tex = NULL;
+ int i;
+
+ for (i = 0; i < gl->ntextures; i++) {
+ if (gl->textures[i].id == 0) {
+ tex = &gl->textures[i];
+ break;
+ }
+ }
+ if (tex == NULL) {
+ if (gl->ntextures+1 > gl->ctextures) {
+ GLNVGtexture* textures;
+ int ctextures = glnvg__maxi(gl->ntextures+1, 4) + gl->ctextures/2; // 1.5x Overallocate
+ textures = (GLNVGtexture*)realloc(gl->textures, sizeof(GLNVGtexture)*ctextures);
+ if (textures == NULL) return NULL;
+ gl->textures = textures;
+ gl->ctextures = ctextures;
+ }
+ tex = &gl->textures[gl->ntextures++];
+ }
+
+ memset(tex, 0, sizeof(*tex));
+ tex->id = ++gl->textureId;
+
+ return tex;
+}
+
+static GLNVGtexture* glnvg__findTexture(GLNVGcontext* gl, int id)
+{
+ int i;
+ for (i = 0; i < gl->ntextures; i++)
+ if (gl->textures[i].id == id)
+ return &gl->textures[i];
+ return NULL;
+}
+
+static int glnvg__deleteTexture(GLNVGcontext* gl, int id)
+{
+ int i;
+ for (i = 0; i < gl->ntextures; i++) {
+ if (gl->textures[i].id == id) {
+ if (gl->textures[i].tex != 0 && (gl->textures[i].flags & NVG_IMAGE_NODELETE) == 0)
+ glDeleteTextures(1, &gl->textures[i].tex);
+ memset(&gl->textures[i], 0, sizeof(gl->textures[i]));
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void glnvg__dumpShaderError(GLuint shader, const char* name, const char* type)
+{
+ GLchar str[512+1];
+ GLsizei len = 0;
+ glGetShaderInfoLog(shader, 512, &len, str);
+ if (len > 512) len = 512;
+ str[len] = '\0';
+ printf("Shader %s/%s error:\n%s\n", name, type, str);
+}
+
+static void glnvg__dumpProgramError(GLuint prog, const char* name)
+{
+ GLchar str[512+1];
+ GLsizei len = 0;
+ glGetProgramInfoLog(prog, 512, &len, str);
+ if (len > 512) len = 512;
+ str[len] = '\0';
+ printf("Program %s error:\n%s\n", name, str);
+}
+
+static void glnvg__checkError(GLNVGcontext* gl, const char* str)
+{
+ GLenum err;
+ if ((gl->flags & NVG_DEBUG) == 0) return;
+ err = glGetError();
+ if (err != GL_NO_ERROR) {
+ printf("Error %08x after %s\n", err, str);
+ return;
+ }
+}
+
+static int glnvg__createShader(GLNVGshader* shader, const char* name, const char* header, const char* opts, const char* vshader, const char* fshader)
+{
+ GLint status;
+ GLuint prog, vert, frag;
+ const char* str[3];
+ str[0] = header;
+ str[1] = opts != NULL ? opts : "";
+
+ memset(shader, 0, sizeof(*shader));
+
+ prog = glCreateProgram();
+ vert = glCreateShader(GL_VERTEX_SHADER);
+ frag = glCreateShader(GL_FRAGMENT_SHADER);
+ str[2] = vshader;
+ glShaderSource(vert, 3, str, 0);
+ str[2] = fshader;
+ glShaderSource(frag, 3, str, 0);
+
+ glCompileShader(vert);
+ glGetShaderiv(vert, GL_COMPILE_STATUS, &status);
+ if (status != GL_TRUE) {
+ glnvg__dumpShaderError(vert, name, "vert");
+ return 0;
+ }
+
+ glCompileShader(frag);
+ glGetShaderiv(frag, GL_COMPILE_STATUS, &status);
+ if (status != GL_TRUE) {
+ glnvg__dumpShaderError(frag, name, "frag");
+ return 0;
+ }
+
+ glAttachShader(prog, vert);
+ glAttachShader(prog, frag);
+
+ glBindAttribLocation(prog, 0, "vertex");
+ glBindAttribLocation(prog, 1, "tcoord");
+
+ glLinkProgram(prog);
+ glGetProgramiv(prog, GL_LINK_STATUS, &status);
+ if (status != GL_TRUE) {
+ glnvg__dumpProgramError(prog, name);
+ return 0;
+ }
+
+ shader->prog = prog;
+ shader->vert = vert;
+ shader->frag = frag;
+
+ return 1;
+}
+
+static void glnvg__deleteShader(GLNVGshader* shader)
+{
+ if (shader->prog != 0)
+ glDeleteProgram(shader->prog);
+ if (shader->vert != 0)
+ glDeleteShader(shader->vert);
+ if (shader->frag != 0)
+ glDeleteShader(shader->frag);
+}
+
+static void glnvg__getUniforms(GLNVGshader* shader)
+{
+ shader->loc[GLNVG_LOC_VIEWSIZE] = glGetUniformLocation(shader->prog, "viewSize");
+ shader->loc[GLNVG_LOC_TEX] = glGetUniformLocation(shader->prog, "tex");
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ shader->loc[GLNVG_LOC_FRAG] = glGetUniformBlockIndex(shader->prog, "frag");
+#else
+ shader->loc[GLNVG_LOC_FRAG] = glGetUniformLocation(shader->prog, "frag");
+#endif
+}
+
+static int glnvg__renderCreate(void* uptr)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ int align = 4;
+
+ // TODO: mediump float may not be enough for GLES2 in iOS.
+ // see the following discussion: https://github.com/memononen/nanovg/issues/46
+ static const char* shaderHeader =
+#if defined NANOVG_GL2
+ "#define NANOVG_GL2 1\n"
+#elif defined NANOVG_GL3
+ "#version 150 core\n"
+ "#define NANOVG_GL3 1\n"
+#elif defined NANOVG_GLES2
+ "#version 100\n"
+ "#define NANOVG_GL2 1\n"
+#elif defined NANOVG_GLES3
+ "#version 300 es\n"
+ "#define NANOVG_GL3 1\n"
+#endif
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ "#define USE_UNIFORMBUFFER 1\n"
+#else
+ "#define UNIFORMARRAY_SIZE 11\n"
+#endif
+ "\n";
+
+ static const char* fillVertShader =
+ "#ifdef NANOVG_GL3\n"
+ " uniform vec2 viewSize;\n"
+ " in vec2 vertex;\n"
+ " in vec2 tcoord;\n"
+ " out vec2 ftcoord;\n"
+ " out vec2 fpos;\n"
+ "#else\n"
+ " uniform vec2 viewSize;\n"
+ " attribute vec2 vertex;\n"
+ " attribute vec2 tcoord;\n"
+ " varying vec2 ftcoord;\n"
+ " varying vec2 fpos;\n"
+ "#endif\n"
+ "void main(void) {\n"
+ " ftcoord = tcoord;\n"
+ " fpos = vertex;\n"
+ " gl_Position = vec4(2.0*vertex.x/viewSize.x - 1.0, 1.0 - 2.0*vertex.y/viewSize.y, 0, 1);\n"
+ "}\n";
+
+ static const char* fillFragShader =
+ "#ifdef GL_ES\n"
+ "#if defined(GL_FRAGMENT_PRECISION_HIGH) || defined(NANOVG_GL3)\n"
+ " precision highp float;\n"
+ "#else\n"
+ " precision mediump float;\n"
+ "#endif\n"
+ "#endif\n"
+ "#ifdef NANOVG_GL3\n"
+ "#ifdef USE_UNIFORMBUFFER\n"
+ " layout(std140) uniform frag {\n"
+ " mat3 scissorMat;\n"
+ " mat3 paintMat;\n"
+ " vec4 innerCol;\n"
+ " vec4 outerCol;\n"
+ " vec2 scissorExt;\n"
+ " vec2 scissorScale;\n"
+ " vec2 extent;\n"
+ " float radius;\n"
+ " float feather;\n"
+ " float strokeMult;\n"
+ " float strokeThr;\n"
+ " int texType;\n"
+ " int type;\n"
+ " };\n"
+ "#else\n" // NANOVG_GL3 && !USE_UNIFORMBUFFER
+ " uniform vec4 frag[UNIFORMARRAY_SIZE];\n"
+ "#endif\n"
+ " uniform sampler2D tex;\n"
+ " in vec2 ftcoord;\n"
+ " in vec2 fpos;\n"
+ " out vec4 outColor;\n"
+ "#else\n" // !NANOVG_GL3
+ " uniform vec4 frag[UNIFORMARRAY_SIZE];\n"
+ " uniform sampler2D tex;\n"
+ " varying vec2 ftcoord;\n"
+ " varying vec2 fpos;\n"
+ "#endif\n"
+ "#ifndef USE_UNIFORMBUFFER\n"
+ " #define scissorMat mat3(frag[0].xyz, frag[1].xyz, frag[2].xyz)\n"
+ " #define paintMat mat3(frag[3].xyz, frag[4].xyz, frag[5].xyz)\n"
+ " #define innerCol frag[6]\n"
+ " #define outerCol frag[7]\n"
+ " #define scissorExt frag[8].xy\n"
+ " #define scissorScale frag[8].zw\n"
+ " #define extent frag[9].xy\n"
+ " #define radius frag[9].z\n"
+ " #define feather frag[9].w\n"
+ " #define strokeMult frag[10].x\n"
+ " #define strokeThr frag[10].y\n"
+ " #define texType int(frag[10].z)\n"
+ " #define type int(frag[10].w)\n"
+ "#endif\n"
+ "\n"
+ "float sdroundrect(vec2 pt, vec2 ext, float rad) {\n"
+ " vec2 ext2 = ext - vec2(rad,rad);\n"
+ " vec2 d = abs(pt) - ext2;\n"
+ " return min(max(d.x,d.y),0.0) + length(max(d,0.0)) - rad;\n"
+ "}\n"
+ "\n"
+ "// Scissoring\n"
+ "float scissorMask(vec2 p) {\n"
+ " vec2 sc = (abs((scissorMat * vec3(p,1.0)).xy) - scissorExt);\n"
+ " sc = vec2(0.5,0.5) - sc * scissorScale;\n"
+ " return clamp(sc.x,0.0,1.0) * clamp(sc.y,0.0,1.0);\n"
+ "}\n"
+ "#ifdef EDGE_AA\n"
+ "// Stroke - from [0..1] to clipped pyramid, where the slope is 1px.\n"
+ "float strokeMask() {\n"
+ " return min(1.0, (1.0-abs(ftcoord.x*2.0-1.0))*strokeMult) * min(1.0, ftcoord.y);\n"
+ "}\n"
+ "#endif\n"
+ "\n"
+ "void main(void) {\n"
+ " vec4 result;\n"
+ " float scissor = scissorMask(fpos);\n"
+ "#ifdef EDGE_AA\n"
+ " float strokeAlpha = strokeMask();\n"
+ " if (strokeAlpha < strokeThr) discard;\n"
+ "#else\n"
+ " float strokeAlpha = 1.0;\n"
+ "#endif\n"
+ " if (type == 0) { // Gradient\n"
+ " // Calculate gradient color using box gradient\n"
+ " vec2 pt = (paintMat * vec3(fpos,1.0)).xy;\n"
+ " float d = clamp((sdroundrect(pt, extent, radius) + feather*0.5) / feather, 0.0, 1.0);\n"
+ " vec4 color = mix(innerCol,outerCol,d);\n"
+ " // Combine alpha\n"
+ " color *= strokeAlpha * scissor;\n"
+ " result = color;\n"
+ " } else if (type == 1) { // Image\n"
+ " // Calculate color fron texture\n"
+ " vec2 pt = (paintMat * vec3(fpos,1.0)).xy / extent;\n"
+ "#ifdef NANOVG_GL3\n"
+ " vec4 color = texture(tex, pt);\n"
+ "#else\n"
+ " vec4 color = texture2D(tex, pt);\n"
+ "#endif\n"
+ " if (texType == 1) color = vec4(color.xyz*color.w,color.w);"
+ " if (texType == 2) color = vec4(color.x);"
+ " // Apply color tint and alpha.\n"
+ " color *= innerCol;\n"
+ " // Combine alpha\n"
+ " color *= strokeAlpha * scissor;\n"
+ " result = color;\n"
+ " } else if (type == 2) { // Stencil fill\n"
+ " result = vec4(1,1,1,1);\n"
+ " } else if (type == 3) { // Textured tris\n"
+ "#ifdef NANOVG_GL3\n"
+ " vec4 color = texture(tex, ftcoord);\n"
+ "#else\n"
+ " vec4 color = texture2D(tex, ftcoord);\n"
+ "#endif\n"
+ " if (texType == 1) color = vec4(color.xyz*color.w,color.w);"
+ " if (texType == 2) color = vec4(color.x);"
+ " color *= scissor;\n"
+ " result = color * innerCol;\n"
+ " }\n"
+ "#ifdef NANOVG_GL3\n"
+ " outColor = result;\n"
+ "#else\n"
+ " gl_FragColor = result;\n"
+ "#endif\n"
+ "}\n";
+
+ glnvg__checkError(gl, "init");
+
+ if (gl->flags & NVG_ANTIALIAS) {
+ if (glnvg__createShader(&gl->shader, "shader", shaderHeader, "#define EDGE_AA 1\n", fillVertShader, fillFragShader) == 0)
+ return 0;
+ } else {
+ if (glnvg__createShader(&gl->shader, "shader", shaderHeader, NULL, fillVertShader, fillFragShader) == 0)
+ return 0;
+ }
+
+ glnvg__checkError(gl, "uniform locations");
+ glnvg__getUniforms(&gl->shader);
+
+ // Create dynamic vertex array
+#if defined NANOVG_GL3
+ glGenVertexArrays(1, &gl->vertArr);
+#endif
+ glGenBuffers(1, &gl->vertBuf);
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ // Create UBOs
+ glUniformBlockBinding(gl->shader.prog, gl->shader.loc[GLNVG_LOC_FRAG], GLNVG_FRAG_BINDING);
+ glGenBuffers(1, &gl->fragBuf);
+ glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &align);
+#endif
+ gl->fragSize = sizeof(GLNVGfragUniforms) + align - sizeof(GLNVGfragUniforms) % align;
+
+ glnvg__checkError(gl, "create done");
+
+ glFinish();
+
+ return 1;
+}
+
+static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ GLNVGtexture* tex = glnvg__allocTexture(gl);
+
+ if (tex == NULL) return 0;
+
+#ifdef NANOVG_GLES2
+ // Check for non-power of 2.
+ if (glnvg__nearestPow2(w) != (unsigned int)w || glnvg__nearestPow2(h) != (unsigned int)h) {
+ // No repeat
+ if ((imageFlags & NVG_IMAGE_REPEATX) != 0 || (imageFlags & NVG_IMAGE_REPEATY) != 0) {
+ printf("Repeat X/Y is not supported for non power-of-two textures (%d x %d)\n", w, h);
+ imageFlags &= ~(NVG_IMAGE_REPEATX | NVG_IMAGE_REPEATY);
+ }
+ // No mips.
+ if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) {
+ printf("Mip-maps is not support for non power-of-two textures (%d x %d)\n", w, h);
+ imageFlags &= ~NVG_IMAGE_GENERATE_MIPMAPS;
+ }
+ }
+#endif
+
+ glGenTextures(1, &tex->tex);
+ tex->width = w;
+ tex->height = h;
+ tex->type = type;
+ tex->flags = imageFlags;
+ glnvg__bindTexture(gl, tex->tex);
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT,1);
+#ifndef NANOVG_GLES2
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+#endif
+
+#if defined (NANOVG_GL2)
+ // GL 1.4 and later has support for generating mipmaps using a tex parameter.
+ if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) {
+ glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
+ }
+#endif
+
+ if (type == NVG_TEXTURE_RGBA)
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
+ else
+#if defined(NANOVG_GLES2) || defined (NANOVG_GL2)
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, w, h, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+#elif defined(NANOVG_GLES3)
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data);
+#else
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data);
+#endif
+
+ if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) {
+ if (imageFlags & NVG_IMAGE_NEAREST) {
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
+ } else {
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+ }
+ } else {
+ if (imageFlags & NVG_IMAGE_NEAREST) {
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ } else {
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ }
+ }
+
+ if (imageFlags & NVG_IMAGE_NEAREST) {
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ } else {
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ }
+
+ if (imageFlags & NVG_IMAGE_REPEATX)
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+ else
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+
+ if (imageFlags & NVG_IMAGE_REPEATY)
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+ else
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+#ifndef NANOVG_GLES2
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+#endif
+
+ // The new way to build mipmaps on GLES and GL3
+#if !defined(NANOVG_GL2)
+ if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) {
+ glGenerateMipmap(GL_TEXTURE_2D);
+ }
+#endif
+
+ glnvg__checkError(gl, "create tex");
+ glnvg__bindTexture(gl, 0);
+
+ return tex->id;
+}
+
+
+static int glnvg__renderDeleteTexture(void* uptr, int image)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ return glnvg__deleteTexture(gl, image);
+}
+
+static int glnvg__renderUpdateTexture(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ GLNVGtexture* tex = glnvg__findTexture(gl, image);
+
+ if (tex == NULL) return 0;
+ glnvg__bindTexture(gl, tex->tex);
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT,1);
+
+#ifndef NANOVG_GLES2
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, x);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, y);
+#else
+ // No support for all of skip, need to update a whole row at a time.
+ if (tex->type == NVG_TEXTURE_RGBA)
+ data += y*tex->width*4;
+ else
+ data += y*tex->width;
+ x = 0;
+ w = tex->width;
+#endif
+
+ if (tex->type == NVG_TEXTURE_RGBA)
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RGBA, GL_UNSIGNED_BYTE, data);
+ else
+#if defined(NANOVG_GLES2) || defined(NANOVG_GL2)
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+#else
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RED, GL_UNSIGNED_BYTE, data);
+#endif
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+#ifndef NANOVG_GLES2
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+#endif
+
+ glnvg__bindTexture(gl, 0);
+
+ return 1;
+}
+
+static int glnvg__renderGetTextureSize(void* uptr, int image, int* w, int* h)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ GLNVGtexture* tex = glnvg__findTexture(gl, image);
+ if (tex == NULL) return 0;
+ *w = tex->width;
+ *h = tex->height;
+ return 1;
+}
+
+static void glnvg__xformToMat3x4(float* m3, float* t)
+{
+ m3[0] = t[0];
+ m3[1] = t[1];
+ m3[2] = 0.0f;
+ m3[3] = 0.0f;
+ m3[4] = t[2];
+ m3[5] = t[3];
+ m3[6] = 0.0f;
+ m3[7] = 0.0f;
+ m3[8] = t[4];
+ m3[9] = t[5];
+ m3[10] = 1.0f;
+ m3[11] = 0.0f;
+}
+
+static NVGcolor glnvg__premulColor(NVGcolor c)
+{
+ c.r *= c.a;
+ c.g *= c.a;
+ c.b *= c.a;
+ return c;
+}
+
+static int glnvg__convertPaint(GLNVGcontext* gl, GLNVGfragUniforms* frag, NVGpaint* paint,
+ NVGscissor* scissor, float width, float fringe, float strokeThr)
+{
+ GLNVGtexture* tex = NULL;
+ float invxform[6];
+
+ memset(frag, 0, sizeof(*frag));
+
+ frag->innerCol = glnvg__premulColor(paint->innerColor);
+ frag->outerCol = glnvg__premulColor(paint->outerColor);
+
+ if (scissor->extent[0] < -0.5f || scissor->extent[1] < -0.5f) {
+ memset(frag->scissorMat, 0, sizeof(frag->scissorMat));
+ frag->scissorExt[0] = 1.0f;
+ frag->scissorExt[1] = 1.0f;
+ frag->scissorScale[0] = 1.0f;
+ frag->scissorScale[1] = 1.0f;
+ } else {
+ nvgTransformInverse(invxform, scissor->xform);
+ glnvg__xformToMat3x4(frag->scissorMat, invxform);
+ frag->scissorExt[0] = scissor->extent[0];
+ frag->scissorExt[1] = scissor->extent[1];
+ frag->scissorScale[0] = sqrtf(scissor->xform[0]*scissor->xform[0] + scissor->xform[2]*scissor->xform[2]) / fringe;
+ frag->scissorScale[1] = sqrtf(scissor->xform[1]*scissor->xform[1] + scissor->xform[3]*scissor->xform[3]) / fringe;
+ }
+
+ memcpy(frag->extent, paint->extent, sizeof(frag->extent));
+ frag->strokeMult = (width*0.5f + fringe*0.5f) / fringe;
+ frag->strokeThr = strokeThr;
+
+ if (paint->image != 0) {
+ tex = glnvg__findTexture(gl, paint->image);
+ if (tex == NULL) return 0;
+ if ((tex->flags & NVG_IMAGE_FLIPY) != 0) {
+ float m1[6], m2[6];
+ nvgTransformTranslate(m1, 0.0f, frag->extent[1] * 0.5f);
+ nvgTransformMultiply(m1, paint->xform);
+ nvgTransformScale(m2, 1.0f, -1.0f);
+ nvgTransformMultiply(m2, m1);
+ nvgTransformTranslate(m1, 0.0f, -frag->extent[1] * 0.5f);
+ nvgTransformMultiply(m1, m2);
+ nvgTransformInverse(invxform, m1);
+ } else {
+ nvgTransformInverse(invxform, paint->xform);
+ }
+ frag->type = NSVG_SHADER_FILLIMG;
+
+ #if NANOVG_GL_USE_UNIFORMBUFFER
+ if (tex->type == NVG_TEXTURE_RGBA)
+ frag->texType = (tex->flags & NVG_IMAGE_PREMULTIPLIED) ? 0 : 1;
+ else
+ frag->texType = 2;
+ #else
+ if (tex->type == NVG_TEXTURE_RGBA)
+ frag->texType = (tex->flags & NVG_IMAGE_PREMULTIPLIED) ? 0.0f : 1.0f;
+ else
+ frag->texType = 2.0f;
+ #endif
+// printf("frag->texType = %d\n", frag->texType);
+ } else {
+ frag->type = NSVG_SHADER_FILLGRAD;
+ frag->radius = paint->radius;
+ frag->feather = paint->feather;
+ nvgTransformInverse(invxform, paint->xform);
+ }
+
+ glnvg__xformToMat3x4(frag->paintMat, invxform);
+
+ return 1;
+}
+
+static GLNVGfragUniforms* nvg__fragUniformPtr(GLNVGcontext* gl, int i);
+
+static void glnvg__setUniforms(GLNVGcontext* gl, int uniformOffset, int image)
+{
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ glBindBufferRange(GL_UNIFORM_BUFFER, GLNVG_FRAG_BINDING, gl->fragBuf, uniformOffset, sizeof(GLNVGfragUniforms));
+#else
+ GLNVGfragUniforms* frag = nvg__fragUniformPtr(gl, uniformOffset);
+ glUniform4fv(gl->shader.loc[GLNVG_LOC_FRAG], NANOVG_GL_UNIFORMARRAY_SIZE, &(frag->uniformArray[0][0]));
+#endif
+
+ if (image != 0) {
+ GLNVGtexture* tex = glnvg__findTexture(gl, image);
+ glnvg__bindTexture(gl, tex != NULL ? tex->tex : 0);
+ glnvg__checkError(gl, "tex paint tex");
+ } else {
+ glnvg__bindTexture(gl, 0);
+ }
+}
+
+static void glnvg__renderViewport(void* uptr, float width, float height, float devicePixelRatio)
+{
+ NVG_NOTUSED(devicePixelRatio);
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ gl->view[0] = width;
+ gl->view[1] = height;
+}
+
+static void glnvg__fill(GLNVGcontext* gl, GLNVGcall* call)
+{
+ GLNVGpath* paths = &gl->paths[call->pathOffset];
+ int i, npaths = call->pathCount;
+
+ // Draw shapes
+ glEnable(GL_STENCIL_TEST);
+ glnvg__stencilMask(gl, 0xff);
+ glnvg__stencilFunc(gl, GL_ALWAYS, 0, 0xff);
+ glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+
+ // set bindpoint for solid loc
+ glnvg__setUniforms(gl, call->uniformOffset, 0);
+ glnvg__checkError(gl, "fill simple");
+
+ glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
+ glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP);
+ glDisable(GL_CULL_FACE);
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount);
+ glEnable(GL_CULL_FACE);
+
+ // Draw anti-aliased pixels
+ glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+
+ glnvg__setUniforms(gl, call->uniformOffset + gl->fragSize, call->image);
+ glnvg__checkError(gl, "fill fill");
+
+ if (gl->flags & NVG_ANTIALIAS) {
+ glnvg__stencilFunc(gl, GL_EQUAL, 0x00, 0xff);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+ // Draw fringes
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+ }
+
+ // Draw fill
+ glnvg__stencilFunc(gl, GL_NOTEQUAL, 0x0, 0xff);
+ glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
+ glDrawArrays(GL_TRIANGLE_STRIP, call->triangleOffset, call->triangleCount);
+
+ glDisable(GL_STENCIL_TEST);
+}
+
+static void glnvg__convexFill(GLNVGcontext* gl, GLNVGcall* call)
+{
+ GLNVGpath* paths = &gl->paths[call->pathOffset];
+ int i, npaths = call->pathCount;
+
+ glnvg__setUniforms(gl, call->uniformOffset, call->image);
+ glnvg__checkError(gl, "convex fill");
+
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount);
+ if (gl->flags & NVG_ANTIALIAS) {
+ // Draw fringes
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+ }
+}
+
+static void glnvg__stroke(GLNVGcontext* gl, GLNVGcall* call)
+{
+ GLNVGpath* paths = &gl->paths[call->pathOffset];
+ int npaths = call->pathCount, i;
+
+ if (gl->flags & NVG_STENCIL_STROKES) {
+
+ glEnable(GL_STENCIL_TEST);
+ glnvg__stencilMask(gl, 0xff);
+
+ // Fill the stroke base without overlap
+ glnvg__stencilFunc(gl, GL_EQUAL, 0x0, 0xff);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
+ glnvg__setUniforms(gl, call->uniformOffset + gl->fragSize, call->image);
+ glnvg__checkError(gl, "stroke fill 0");
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+
+ // Draw anti-aliased pixels.
+ glnvg__setUniforms(gl, call->uniformOffset, call->image);
+ glnvg__stencilFunc(gl, GL_EQUAL, 0x00, 0xff);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+
+ // Clear stencil buffer.
+ glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+ glnvg__stencilFunc(gl, GL_ALWAYS, 0x0, 0xff);
+ glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
+ glnvg__checkError(gl, "stroke fill 1");
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+ glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+
+ glDisable(GL_STENCIL_TEST);
+
+// glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, strokeWidth, fringe, 1.0f - 0.5f/255.0f);
+
+ } else {
+ glnvg__setUniforms(gl, call->uniformOffset, call->image);
+ glnvg__checkError(gl, "stroke fill");
+ // Draw Strokes
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+ }
+}
+
+static void glnvg__triangles(GLNVGcontext* gl, GLNVGcall* call)
+{
+ glnvg__setUniforms(gl, call->uniformOffset, call->image);
+ glnvg__checkError(gl, "triangles fill");
+
+ glDrawArrays(GL_TRIANGLES, call->triangleOffset, call->triangleCount);
+}
+
+static void glnvg__renderCancel(void* uptr) {
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ gl->nverts = 0;
+ gl->npaths = 0;
+ gl->ncalls = 0;
+ gl->nuniforms = 0;
+}
+
+static GLenum glnvg_convertBlendFuncFactor(int factor)
+{
+ if (factor == NVG_ZERO)
+ return GL_ZERO;
+ if (factor == NVG_ONE)
+ return GL_ONE;
+ if (factor == NVG_SRC_COLOR)
+ return GL_SRC_COLOR;
+ if (factor == NVG_ONE_MINUS_SRC_COLOR)
+ return GL_ONE_MINUS_SRC_COLOR;
+ if (factor == NVG_DST_COLOR)
+ return GL_DST_COLOR;
+ if (factor == NVG_ONE_MINUS_DST_COLOR)
+ return GL_ONE_MINUS_DST_COLOR;
+ if (factor == NVG_SRC_ALPHA)
+ return GL_SRC_ALPHA;
+ if (factor == NVG_ONE_MINUS_SRC_ALPHA)
+ return GL_ONE_MINUS_SRC_ALPHA;
+ if (factor == NVG_DST_ALPHA)
+ return GL_DST_ALPHA;
+ if (factor == NVG_ONE_MINUS_DST_ALPHA)
+ return GL_ONE_MINUS_DST_ALPHA;
+ if (factor == NVG_SRC_ALPHA_SATURATE)
+ return GL_SRC_ALPHA_SATURATE;
+ return GL_INVALID_ENUM;
+}
+
+static GLNVGblend glnvg__blendCompositeOperation(NVGcompositeOperationState op)
+{
+ GLNVGblend blend;
+ blend.srcRGB = glnvg_convertBlendFuncFactor(op.srcRGB);
+ blend.dstRGB = glnvg_convertBlendFuncFactor(op.dstRGB);
+ blend.srcAlpha = glnvg_convertBlendFuncFactor(op.srcAlpha);
+ blend.dstAlpha = glnvg_convertBlendFuncFactor(op.dstAlpha);
+ if (blend.srcRGB == GL_INVALID_ENUM || blend.dstRGB == GL_INVALID_ENUM || blend.srcAlpha == GL_INVALID_ENUM || blend.dstAlpha == GL_INVALID_ENUM)
+ {
+ blend.srcRGB = GL_ONE;
+ blend.dstRGB = GL_ONE_MINUS_SRC_ALPHA;
+ blend.srcAlpha = GL_ONE;
+ blend.dstAlpha = GL_ONE_MINUS_SRC_ALPHA;
+ }
+ return blend;
+}
+
+static void glnvg__renderFlush(void* uptr)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ int i;
+
+ if (gl->ncalls > 0) {
+
+ // Setup require GL state.
+ glUseProgram(gl->shader.prog);
+
+ glEnable(GL_CULL_FACE);
+ glCullFace(GL_BACK);
+ glFrontFace(GL_CCW);
+ glEnable(GL_BLEND);
+ glDisable(GL_DEPTH_TEST);
+ glDisable(GL_SCISSOR_TEST);
+ glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+ glStencilMask(0xffffffff);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+ glStencilFunc(GL_ALWAYS, 0, 0xffffffff);
+ glActiveTexture(GL_TEXTURE0);
+ glBindTexture(GL_TEXTURE_2D, 0);
+ #if NANOVG_GL_USE_STATE_FILTER
+ gl->boundTexture = 0;
+ gl->stencilMask = 0xffffffff;
+ gl->stencilFunc = GL_ALWAYS;
+ gl->stencilFuncRef = 0;
+ gl->stencilFuncMask = 0xffffffff;
+ gl->blendFunc.srcRGB = GL_INVALID_ENUM;
+ gl->blendFunc.srcAlpha = GL_INVALID_ENUM;
+ gl->blendFunc.dstRGB = GL_INVALID_ENUM;
+ gl->blendFunc.dstAlpha = GL_INVALID_ENUM;
+ #endif
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ // Upload ubo for frag shaders
+ glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf);
+ glBufferData(GL_UNIFORM_BUFFER, gl->nuniforms * gl->fragSize, gl->uniforms, GL_STREAM_DRAW);
+#endif
+
+ // Upload vertex data
+#if defined NANOVG_GL3
+ glBindVertexArray(gl->vertArr);
+#endif
+ glBindBuffer(GL_ARRAY_BUFFER, gl->vertBuf);
+ glBufferData(GL_ARRAY_BUFFER, gl->nverts * sizeof(NVGvertex), gl->verts, GL_STREAM_DRAW);
+ glEnableVertexAttribArray(0);
+ glEnableVertexAttribArray(1);
+ glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(NVGvertex), (const GLvoid*)(size_t)0);
+ glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(NVGvertex), (const GLvoid*)(0 + 2*sizeof(float)));
+
+ // Set view and texture just once per frame.
+ glUniform1i(gl->shader.loc[GLNVG_LOC_TEX], 0);
+ glUniform2fv(gl->shader.loc[GLNVG_LOC_VIEWSIZE], 1, gl->view);
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf);
+#endif
+
+ for (i = 0; i < gl->ncalls; i++) {
+ GLNVGcall* call = &gl->calls[i];
+ glnvg__blendFuncSeparate(gl,&call->blendFunc);
+ if (call->type == GLNVG_FILL)
+ glnvg__fill(gl, call);
+ else if (call->type == GLNVG_CONVEXFILL)
+ glnvg__convexFill(gl, call);
+ else if (call->type == GLNVG_STROKE)
+ glnvg__stroke(gl, call);
+ else if (call->type == GLNVG_TRIANGLES)
+ glnvg__triangles(gl, call);
+ }
+
+ glDisableVertexAttribArray(0);
+ glDisableVertexAttribArray(1);
+#if defined NANOVG_GL3
+ glBindVertexArray(0);
+#endif
+ glDisable(GL_CULL_FACE);
+ glBindBuffer(GL_ARRAY_BUFFER, 0);
+ glUseProgram(0);
+ glnvg__bindTexture(gl, 0);
+ }
+
+ // Reset calls
+ gl->nverts = 0;
+ gl->npaths = 0;
+ gl->ncalls = 0;
+ gl->nuniforms = 0;
+}
+
+static int glnvg__maxVertCount(const NVGpath* paths, int npaths)
+{
+ int i, count = 0;
+ for (i = 0; i < npaths; i++) {
+ count += paths[i].nfill;
+ count += paths[i].nstroke;
+ }
+ return count;
+}
+
+static GLNVGcall* glnvg__allocCall(GLNVGcontext* gl)
+{
+ GLNVGcall* ret = NULL;
+ if (gl->ncalls+1 > gl->ccalls) {
+ GLNVGcall* calls;
+ int ccalls = glnvg__maxi(gl->ncalls+1, 128) + gl->ccalls/2; // 1.5x Overallocate
+ calls = (GLNVGcall*)realloc(gl->calls, sizeof(GLNVGcall) * ccalls);
+ if (calls == NULL) return NULL;
+ gl->calls = calls;
+ gl->ccalls = ccalls;
+ }
+ ret = &gl->calls[gl->ncalls++];
+ memset(ret, 0, sizeof(GLNVGcall));
+ return ret;
+}
+
+static int glnvg__allocPaths(GLNVGcontext* gl, int n)
+{
+ int ret = 0;
+ if (gl->npaths+n > gl->cpaths) {
+ GLNVGpath* paths;
+ int cpaths = glnvg__maxi(gl->npaths + n, 128) + gl->cpaths/2; // 1.5x Overallocate
+ paths = (GLNVGpath*)realloc(gl->paths, sizeof(GLNVGpath) * cpaths);
+ if (paths == NULL) return -1;
+ gl->paths = paths;
+ gl->cpaths = cpaths;
+ }
+ ret = gl->npaths;
+ gl->npaths += n;
+ return ret;
+}
+
+static int glnvg__allocVerts(GLNVGcontext* gl, int n)
+{
+ int ret = 0;
+ if (gl->nverts+n > gl->cverts) {
+ NVGvertex* verts;
+ int cverts = glnvg__maxi(gl->nverts + n, 4096) + gl->cverts/2; // 1.5x Overallocate
+ verts = (NVGvertex*)realloc(gl->verts, sizeof(NVGvertex) * cverts);
+ if (verts == NULL) return -1;
+ gl->verts = verts;
+ gl->cverts = cverts;
+ }
+ ret = gl->nverts;
+ gl->nverts += n;
+ return ret;
+}
+
+static int glnvg__allocFragUniforms(GLNVGcontext* gl, int n)
+{
+ int ret = 0, structSize = gl->fragSize;
+ if (gl->nuniforms+n > gl->cuniforms) {
+ unsigned char* uniforms;
+ int cuniforms = glnvg__maxi(gl->nuniforms+n, 128) + gl->cuniforms/2; // 1.5x Overallocate
+ uniforms = (unsigned char*)realloc(gl->uniforms, structSize * cuniforms);
+ if (uniforms == NULL) return -1;
+ gl->uniforms = uniforms;
+ gl->cuniforms = cuniforms;
+ }
+ ret = gl->nuniforms * structSize;
+ gl->nuniforms += n;
+ return ret;
+}
+
+static GLNVGfragUniforms* nvg__fragUniformPtr(GLNVGcontext* gl, int i)
+{
+ return (GLNVGfragUniforms*)&gl->uniforms[i];
+}
+
+static void glnvg__vset(NVGvertex* vtx, float x, float y, float u, float v)
+{
+ vtx->x = x;
+ vtx->y = y;
+ vtx->u = u;
+ vtx->v = v;
+}
+
+static void glnvg__renderFill(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe,
+ const float* bounds, const NVGpath* paths, int npaths)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ GLNVGcall* call = glnvg__allocCall(gl);
+ NVGvertex* quad;
+ GLNVGfragUniforms* frag;
+ int i, maxverts, offset;
+
+ if (call == NULL) return;
+
+ call->type = GLNVG_FILL;
+ call->triangleCount = 4;
+ call->pathOffset = glnvg__allocPaths(gl, npaths);
+ if (call->pathOffset == -1) goto error;
+ call->pathCount = npaths;
+ call->image = paint->image;
+ call->blendFunc = glnvg__blendCompositeOperation(compositeOperation);
+
+ if (npaths == 1 && paths[0].convex)
+ {
+ call->type = GLNVG_CONVEXFILL;
+ call->triangleCount = 0; // Bounding box fill quad not needed for convex fill
+ }
+
+ // Allocate vertices for all the paths.
+ maxverts = glnvg__maxVertCount(paths, npaths) + call->triangleCount;
+ offset = glnvg__allocVerts(gl, maxverts);
+ if (offset == -1) goto error;
+
+ for (i = 0; i < npaths; i++) {
+ GLNVGpath* copy = &gl->paths[call->pathOffset + i];
+ const NVGpath* path = &paths[i];
+ memset(copy, 0, sizeof(GLNVGpath));
+ if (path->nfill > 0) {
+ copy->fillOffset = offset;
+ copy->fillCount = path->nfill;
+ memcpy(&gl->verts[offset], path->fill, sizeof(NVGvertex) * path->nfill);
+ offset += path->nfill;
+ }
+ if (path->nstroke > 0) {
+ copy->strokeOffset = offset;
+ copy->strokeCount = path->nstroke;
+ memcpy(&gl->verts[offset], path->stroke, sizeof(NVGvertex) * path->nstroke);
+ offset += path->nstroke;
+ }
+ }
+
+ // Setup uniforms for draw calls
+ if (call->type == GLNVG_FILL) {
+ // Quad
+ call->triangleOffset = offset;
+ quad = &gl->verts[call->triangleOffset];
+ glnvg__vset(&quad[0], bounds[2], bounds[3], 0.5f, 1.0f);
+ glnvg__vset(&quad[1], bounds[2], bounds[1], 0.5f, 1.0f);
+ glnvg__vset(&quad[2], bounds[0], bounds[3], 0.5f, 1.0f);
+ glnvg__vset(&quad[3], bounds[0], bounds[1], 0.5f, 1.0f);
+
+ call->uniformOffset = glnvg__allocFragUniforms(gl, 2);
+ if (call->uniformOffset == -1) goto error;
+ // Simple shader for stencil
+ frag = nvg__fragUniformPtr(gl, call->uniformOffset);
+ memset(frag, 0, sizeof(*frag));
+ frag->strokeThr = -1.0f;
+ frag->type = NSVG_SHADER_SIMPLE;
+ // Fill shader
+ glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, fringe, fringe, -1.0f);
+ } else {
+ call->uniformOffset = glnvg__allocFragUniforms(gl, 1);
+ if (call->uniformOffset == -1) goto error;
+ // Fill shader
+ glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, fringe, fringe, -1.0f);
+ }
+
+ return;
+
+error:
+ // We get here if call alloc was ok, but something else is not.
+ // Roll back the last call to prevent drawing it.
+ if (gl->ncalls > 0) gl->ncalls--;
+}
+
+static void glnvg__renderStroke(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe,
+ float strokeWidth, const NVGpath* paths, int npaths)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ GLNVGcall* call = glnvg__allocCall(gl);
+ int i, maxverts, offset;
+
+ if (call == NULL) return;
+
+ call->type = GLNVG_STROKE;
+ call->pathOffset = glnvg__allocPaths(gl, npaths);
+ if (call->pathOffset == -1) goto error;
+ call->pathCount = npaths;
+ call->image = paint->image;
+ call->blendFunc = glnvg__blendCompositeOperation(compositeOperation);
+
+ // Allocate vertices for all the paths.
+ maxverts = glnvg__maxVertCount(paths, npaths);
+ offset = glnvg__allocVerts(gl, maxverts);
+ if (offset == -1) goto error;
+
+ for (i = 0; i < npaths; i++) {
+ GLNVGpath* copy = &gl->paths[call->pathOffset + i];
+ const NVGpath* path = &paths[i];
+ memset(copy, 0, sizeof(GLNVGpath));
+ if (path->nstroke) {
+ copy->strokeOffset = offset;
+ copy->strokeCount = path->nstroke;
+ memcpy(&gl->verts[offset], path->stroke, sizeof(NVGvertex) * path->nstroke);
+ offset += path->nstroke;
+ }
+ }
+
+ if (gl->flags & NVG_STENCIL_STROKES) {
+ // Fill shader
+ call->uniformOffset = glnvg__allocFragUniforms(gl, 2);
+ if (call->uniformOffset == -1) goto error;
+
+ glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, strokeWidth, fringe, -1.0f);
+ glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, strokeWidth, fringe, 1.0f - 0.5f/255.0f);
+
+ } else {
+ // Fill shader
+ call->uniformOffset = glnvg__allocFragUniforms(gl, 1);
+ if (call->uniformOffset == -1) goto error;
+ glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, strokeWidth, fringe, -1.0f);
+ }
+
+ return;
+
+error:
+ // We get here if call alloc was ok, but something else is not.
+ // Roll back the last call to prevent drawing it.
+ if (gl->ncalls > 0) gl->ncalls--;
+}
+
+static void glnvg__renderTriangles(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor,
+ const NVGvertex* verts, int nverts)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ GLNVGcall* call = glnvg__allocCall(gl);
+ GLNVGfragUniforms* frag;
+
+ if (call == NULL) return;
+
+ call->type = GLNVG_TRIANGLES;
+ call->image = paint->image;
+ call->blendFunc = glnvg__blendCompositeOperation(compositeOperation);
+
+ // Allocate vertices for all the paths.
+ call->triangleOffset = glnvg__allocVerts(gl, nverts);
+ if (call->triangleOffset == -1) goto error;
+ call->triangleCount = nverts;
+
+ memcpy(&gl->verts[call->triangleOffset], verts, sizeof(NVGvertex) * nverts);
+
+ // Fill shader
+ call->uniformOffset = glnvg__allocFragUniforms(gl, 1);
+ if (call->uniformOffset == -1) goto error;
+ frag = nvg__fragUniformPtr(gl, call->uniformOffset);
+ glnvg__convertPaint(gl, frag, paint, scissor, 1.0f, 1.0f, -1.0f);
+ frag->type = NSVG_SHADER_IMG;
+
+ return;
+
+error:
+ // We get here if call alloc was ok, but something else is not.
+ // Roll back the last call to prevent drawing it.
+ if (gl->ncalls > 0) gl->ncalls--;
+}
+
+static void glnvg__renderDelete(void* uptr)
+{
+ GLNVGcontext* gl = (GLNVGcontext*)uptr;
+ int i;
+ if (gl == NULL) return;
+
+ glnvg__deleteShader(&gl->shader);
+
+#if NANOVG_GL3
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ if (gl->fragBuf != 0)
+ glDeleteBuffers(1, &gl->fragBuf);
+#endif
+ if (gl->vertArr != 0)
+ glDeleteVertexArrays(1, &gl->vertArr);
+#endif
+ if (gl->vertBuf != 0)
+ glDeleteBuffers(1, &gl->vertBuf);
+
+ for (i = 0; i < gl->ntextures; i++) {
+ if (gl->textures[i].tex != 0 && (gl->textures[i].flags & NVG_IMAGE_NODELETE) == 0)
+ glDeleteTextures(1, &gl->textures[i].tex);
+ }
+ free(gl->textures);
+
+ free(gl->paths);
+ free(gl->verts);
+ free(gl->uniforms);
+ free(gl->calls);
+
+ free(gl);
+}
+
+
+#if defined NANOVG_GL2
+NVGcontext* nvgCreateGL2(int flags)
+#elif defined NANOVG_GL3
+NVGcontext* nvgCreateGL3(int flags)
+#elif defined NANOVG_GLES2
+NVGcontext* nvgCreateGLES2(int flags)
+#elif defined NANOVG_GLES3
+NVGcontext* nvgCreateGLES3(int flags)
+#endif
+{
+ NVGparams params;
+ NVGcontext* ctx = NULL;
+ GLNVGcontext* gl = (GLNVGcontext*)malloc(sizeof(GLNVGcontext));
+ if (gl == NULL) goto error;
+ memset(gl, 0, sizeof(GLNVGcontext));
+
+ memset(¶ms, 0, sizeof(params));
+ params.renderCreate = glnvg__renderCreate;
+ params.renderCreateTexture = glnvg__renderCreateTexture;
+ params.renderDeleteTexture = glnvg__renderDeleteTexture;
+ params.renderUpdateTexture = glnvg__renderUpdateTexture;
+ params.renderGetTextureSize = glnvg__renderGetTextureSize;
+ params.renderViewport = glnvg__renderViewport;
+ params.renderCancel = glnvg__renderCancel;
+ params.renderFlush = glnvg__renderFlush;
+ params.renderFill = glnvg__renderFill;
+ params.renderStroke = glnvg__renderStroke;
+ params.renderTriangles = glnvg__renderTriangles;
+ params.renderDelete = glnvg__renderDelete;
+ params.userPtr = gl;
+ params.edgeAntiAlias = flags & NVG_ANTIALIAS ? 1 : 0;
+
+ gl->flags = flags;
+
+ ctx = nvgCreateInternal(¶ms);
+ if (ctx == NULL) goto error;
+
+ return ctx;
+
+error:
+ // 'gl' is freed by nvgDeleteInternal.
+ if (ctx != NULL) nvgDeleteInternal(ctx);
+ return NULL;
+}
+
+#if defined NANOVG_GL2
+void nvgDeleteGL2(NVGcontext* ctx)
+#elif defined NANOVG_GL3
+void nvgDeleteGL3(NVGcontext* ctx)
+#elif defined NANOVG_GLES2
+void nvgDeleteGLES2(NVGcontext* ctx)
+#elif defined NANOVG_GLES3
+void nvgDeleteGLES3(NVGcontext* ctx)
+#endif
+{
+ nvgDeleteInternal(ctx);
+}
+
+#if defined NANOVG_GL2
+int nvglCreateImageFromHandleGL2(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags)
+#elif defined NANOVG_GL3
+int nvglCreateImageFromHandleGL3(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags)
+#elif defined NANOVG_GLES2
+int nvglCreateImageFromHandleGLES2(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags)
+#elif defined NANOVG_GLES3
+int nvglCreateImageFromHandleGLES3(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags)
+#endif
+{
+ GLNVGcontext* gl = (GLNVGcontext*)nvgInternalParams(ctx)->userPtr;
+ GLNVGtexture* tex = glnvg__allocTexture(gl);
+
+ if (tex == NULL) return 0;
+
+ tex->type = NVG_TEXTURE_RGBA;
+ tex->tex = textureId;
+ tex->flags = imageFlags;
+ tex->width = w;
+ tex->height = h;
+
+ return tex->id;
+}
+
+#if defined NANOVG_GL2
+GLuint nvglImageHandleGL2(NVGcontext* ctx, int image)
+#elif defined NANOVG_GL3
+GLuint nvglImageHandleGL3(NVGcontext* ctx, int image)
+#elif defined NANOVG_GLES2
+GLuint nvglImageHandleGLES2(NVGcontext* ctx, int image)
+#elif defined NANOVG_GLES3
+GLuint nvglImageHandleGLES3(NVGcontext* ctx, int image)
+#endif
+{
+ GLNVGcontext* gl = (GLNVGcontext*)nvgInternalParams(ctx)->userPtr;
+ GLNVGtexture* tex = glnvg__findTexture(gl, image);
+ return tex->tex;
+}
+
+#endif /* NANOVG_GL_IMPLEMENTATION */
diff --git a/deps/nanovg/nanovg_gl_utils.h b/deps/nanovg/nanovg_gl_utils.h
@@ -0,0 +1,154 @@
+//
+// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would be
+// appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+// misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+#ifndef NANOVG_GL_UTILS_H
+#define NANOVG_GL_UTILS_H
+
+struct NVGLUframebuffer {
+ NVGcontext* ctx;
+ GLuint fbo;
+ GLuint rbo;
+ GLuint texture;
+ int image;
+};
+typedef struct NVGLUframebuffer NVGLUframebuffer;
+
+// Helper function to create GL frame buffer to render to.
+void nvgluBindFramebuffer(NVGLUframebuffer* fb);
+NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imageFlags);
+void nvgluDeleteFramebuffer(NVGLUframebuffer* fb);
+
+#endif // NANOVG_GL_UTILS_H
+
+#ifdef NANOVG_GL_IMPLEMENTATION
+
+#if defined(NANOVG_GL3) || defined(NANOVG_GLES2) || defined(NANOVG_GLES3)
+// FBO is core in OpenGL 3>.
+# define NANOVG_FBO_VALID 1
+#elif defined(NANOVG_GL2)
+// On OS X including glext defines FBO on GL2 too.
+# ifdef __APPLE__
+# include <OpenGL/glext.h>
+# define NANOVG_FBO_VALID 1
+# endif
+#endif
+
+static GLint defaultFBO = -1;
+
+NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imageFlags)
+{
+#ifdef NANOVG_FBO_VALID
+ GLint defaultFBO;
+ GLint defaultRBO;
+ NVGLUframebuffer* fb = NULL;
+
+ glGetIntegerv(GL_FRAMEBUFFER_BINDING, &defaultFBO);
+ glGetIntegerv(GL_RENDERBUFFER_BINDING, &defaultRBO);
+
+ fb = (NVGLUframebuffer*)malloc(sizeof(NVGLUframebuffer));
+ if (fb == NULL) goto error;
+ memset(fb, 0, sizeof(NVGLUframebuffer));
+
+ fb->image = nvgCreateImageRGBA(ctx, w, h, imageFlags | NVG_IMAGE_FLIPY | NVG_IMAGE_PREMULTIPLIED, NULL);
+
+#if defined NANOVG_GL2
+ fb->texture = nvglImageHandleGL2(ctx, fb->image);
+#elif defined NANOVG_GL3
+ fb->texture = nvglImageHandleGL3(ctx, fb->image);
+#elif defined NANOVG_GLES2
+ fb->texture = nvglImageHandleGLES2(ctx, fb->image);
+#elif defined NANOVG_GLES3
+ fb->texture = nvglImageHandleGLES3(ctx, fb->image);
+#endif
+
+ fb->ctx = ctx;
+
+ // frame buffer object
+ glGenFramebuffers(1, &fb->fbo);
+ glBindFramebuffer(GL_FRAMEBUFFER, fb->fbo);
+
+ // render buffer object
+ glGenRenderbuffers(1, &fb->rbo);
+ glBindRenderbuffer(GL_RENDERBUFFER, fb->rbo);
+ glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, w, h);
+
+ // combine all
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb->texture, 0);
+ glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fb->rbo);
+
+ if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+#ifdef GL_DEPTH24_STENCIL8
+ // If GL_STENCIL_INDEX8 is not supported, try GL_DEPTH24_STENCIL8 as a fallback.
+ // Some graphics cards require a depth buffer along with a stencil.
+ glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, w, h);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb->texture, 0);
+ glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fb->rbo);
+
+ if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+#endif // GL_DEPTH24_STENCIL8
+ goto error;
+ }
+
+ glBindFramebuffer(GL_FRAMEBUFFER, defaultFBO);
+ glBindRenderbuffer(GL_RENDERBUFFER, defaultRBO);
+ return fb;
+error:
+ glBindFramebuffer(GL_FRAMEBUFFER, defaultFBO);
+ glBindRenderbuffer(GL_RENDERBUFFER, defaultRBO);
+ nvgluDeleteFramebuffer(fb);
+ return NULL;
+#else
+ NVG_NOTUSED(ctx);
+ NVG_NOTUSED(w);
+ NVG_NOTUSED(h);
+ NVG_NOTUSED(imageFlags);
+ return NULL;
+#endif
+}
+
+void nvgluBindFramebuffer(NVGLUframebuffer* fb)
+{
+#ifdef NANOVG_FBO_VALID
+ if (defaultFBO == -1) glGetIntegerv(GL_FRAMEBUFFER_BINDING, &defaultFBO);
+ glBindFramebuffer(GL_FRAMEBUFFER, fb != NULL ? fb->fbo : defaultFBO);
+#else
+ NVG_NOTUSED(fb);
+#endif
+}
+
+void nvgluDeleteFramebuffer(NVGLUframebuffer* fb)
+{
+#ifdef NANOVG_FBO_VALID
+ if (fb == NULL) return;
+ if (fb->fbo != 0)
+ glDeleteFramebuffers(1, &fb->fbo);
+ if (fb->rbo != 0)
+ glDeleteRenderbuffers(1, &fb->rbo);
+ if (fb->image >= 0)
+ nvgDeleteImage(fb->ctx, fb->image);
+ fb->ctx = NULL;
+ fb->fbo = 0;
+ fb->rbo = 0;
+ fb->texture = 0;
+ fb->image = -1;
+ free(fb);
+#else
+ NVG_NOTUSED(fb);
+#endif
+}
+
+#endif // NANOVG_GL_IMPLEMENTATION
diff --git a/deps/nanovg/stb_image.h b/deps/nanovg/stb_image.h
@@ -0,0 +1,6614 @@
+/* stb_image - v2.10 - public domain image loader - http://nothings.org/stb_image.h
+ no warranty implied; use at your own risk
+
+ Do this:
+ #define STB_IMAGE_IMPLEMENTATION
+ before you include this file in *one* C or C++ file to create the implementation.
+
+ // i.e. it should look like this:
+ #include ...
+ #include ...
+ #include ...
+ #define STB_IMAGE_IMPLEMENTATION
+ #include "stb_image.h"
+
+ You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
+ And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
+
+
+ QUICK NOTES:
+ Primarily of interest to game developers and other people who can
+ avoid problematic images and only need the trivial interface
+
+ JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib)
+ PNG 1/2/4/8-bit-per-channel (16 bpc not supported)
+
+ TGA (not sure what subset, if a subset)
+ BMP non-1bpp, non-RLE
+ PSD (composited view only, no extra channels, 8/16 bit-per-channel)
+
+ GIF (*comp always reports as 4-channel)
+ HDR (radiance rgbE format)
+ PIC (Softimage PIC)
+ PNM (PPM and PGM binary only)
+
+ Animated GIF still needs a proper API, but here's one way to do it:
+ http://gist.github.com/urraka/685d9a6340b26b830d49
+
+ - decode from memory or through FILE (define STBI_NO_STDIO to remove code)
+ - decode from arbitrary I/O callbacks
+ - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON)
+
+ Full documentation under "DOCUMENTATION" below.
+
+
+ Revision 2.00 release notes:
+
+ - Progressive JPEG is now supported.
+
+ - PPM and PGM binary formats are now supported, thanks to Ken Miller.
+
+ - x86 platforms now make use of SSE2 SIMD instructions for
+ JPEG decoding, and ARM platforms can use NEON SIMD if requested.
+ This work was done by Fabian "ryg" Giesen. SSE2 is used by
+ default, but NEON must be enabled explicitly; see docs.
+
+ With other JPEG optimizations included in this version, we see
+ 2x speedup on a JPEG on an x86 machine, and a 1.5x speedup
+ on a JPEG on an ARM machine, relative to previous versions of this
+ library. The same results will not obtain for all JPGs and for all
+ x86/ARM machines. (Note that progressive JPEGs are significantly
+ slower to decode than regular JPEGs.) This doesn't mean that this
+ is the fastest JPEG decoder in the land; rather, it brings it
+ closer to parity with standard libraries. If you want the fastest
+ decode, look elsewhere. (See "Philosophy" section of docs below.)
+
+ See final bullet items below for more info on SIMD.
+
+ - Added STBI_MALLOC, STBI_REALLOC, and STBI_FREE macros for replacing
+ the memory allocator. Unlike other STBI libraries, these macros don't
+ support a context parameter, so if you need to pass a context in to
+ the allocator, you'll have to store it in a global or a thread-local
+ variable.
+
+ - Split existing STBI_NO_HDR flag into two flags, STBI_NO_HDR and
+ STBI_NO_LINEAR.
+ STBI_NO_HDR: suppress implementation of .hdr reader format
+ STBI_NO_LINEAR: suppress high-dynamic-range light-linear float API
+
+ - You can suppress implementation of any of the decoders to reduce
+ your code footprint by #defining one or more of the following
+ symbols before creating the implementation.
+
+ STBI_NO_JPEG
+ STBI_NO_PNG
+ STBI_NO_BMP
+ STBI_NO_PSD
+ STBI_NO_TGA
+ STBI_NO_GIF
+ STBI_NO_HDR
+ STBI_NO_PIC
+ STBI_NO_PNM (.ppm and .pgm)
+
+ - You can request *only* certain decoders and suppress all other ones
+ (this will be more forward-compatible, as addition of new decoders
+ doesn't require you to disable them explicitly):
+
+ STBI_ONLY_JPEG
+ STBI_ONLY_PNG
+ STBI_ONLY_BMP
+ STBI_ONLY_PSD
+ STBI_ONLY_TGA
+ STBI_ONLY_GIF
+ STBI_ONLY_HDR
+ STBI_ONLY_PIC
+ STBI_ONLY_PNM (.ppm and .pgm)
+
+ Note that you can define multiples of these, and you will get all
+ of them ("only x" and "only y" is interpreted to mean "only x&y").
+
+ - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still
+ want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
+
+ - Compilation of all SIMD code can be suppressed with
+ #define STBI_NO_SIMD
+ It should not be necessary to disable SIMD unless you have issues
+ compiling (e.g. using an x86 compiler which doesn't support SSE
+ intrinsics or that doesn't support the method used to detect
+ SSE2 support at run-time), and even those can be reported as
+ bugs so I can refine the built-in compile-time checking to be
+ smarter.
+
+ - The old STBI_SIMD system which allowed installing a user-defined
+ IDCT etc. has been removed. If you need this, don't upgrade. My
+ assumption is that almost nobody was doing this, and those who
+ were will find the built-in SIMD more satisfactory anyway.
+
+ - RGB values computed for JPEG images are slightly different from
+ previous versions of stb_image. (This is due to using less
+ integer precision in SIMD.) The C code has been adjusted so
+ that the same RGB values will be computed regardless of whether
+ SIMD support is available, so your app should always produce
+ consistent results. But these results are slightly different from
+ previous versions. (Specifically, about 3% of available YCbCr values
+ will compute different RGB results from pre-1.49 versions by +-1;
+ most of the deviating values are one smaller in the G channel.)
+
+ - If you must produce consistent results with previous versions of
+ stb_image, #define STBI_JPEG_OLD and you will get the same results
+ you used to; however, you will not get the SIMD speedups for
+ the YCbCr-to-RGB conversion step (although you should still see
+ significant JPEG speedup from the other changes).
+
+ Please note that STBI_JPEG_OLD is a temporary feature; it will be
+ removed in future versions of the library. It is only intended for
+ near-term back-compatibility use.
+
+
+ Latest revision history:
+ 2.10 (2016-01-22) avoid warning introduced in 2.09
+ 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
+ 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
+ 2.07 (2015-09-13) partial animated GIF support
+ limited 16-bit PSD support
+ minor bugs, code cleanup, and compiler warnings
+ 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value
+ 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning
+ 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit
+ 2.03 (2015-04-12) additional corruption checking
+ stbi_set_flip_vertically_on_load
+ fix NEON support; fix mingw support
+ 2.02 (2015-01-19) fix incorrect assert, fix warning
+ 2.01 (2015-01-17) fix various warnings
+ 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG
+ 2.00 (2014-12-25) optimize JPEG, including x86 SSE2 & ARM NEON SIMD
+ progressive JPEG
+ PGM/PPM support
+ STBI_MALLOC,STBI_REALLOC,STBI_FREE
+ STBI_NO_*, STBI_ONLY_*
+ GIF bugfix
+ 1.48 (2014-12-14) fix incorrectly-named assert()
+ 1.47 (2014-12-14) 1/2/4-bit PNG support (both grayscale and paletted)
+ optimize PNG
+ fix bug in interlaced PNG with user-specified channel count
+
+ See end of file for full revision history.
+
+
+ ============================ Contributors =========================
+
+ Image formats Extensions, features
+ Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info)
+ Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info)
+ Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG)
+ Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks)
+ Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG)
+ Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip)
+ Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD)
+ urraka@github (animated gif) Junggon Kim (PNM comments)
+ Daniel Gibson (16-bit TGA)
+
+ Optimizations & bugfixes
+ Fabian "ryg" Giesen
+ Arseny Kapoulkine
+
+ Bug & warning fixes
+ Marc LeBlanc David Woo Guillaume George Martins Mozeiko
+ Christpher Lloyd Martin Golini Jerry Jansson Joseph Thomson
+ Dave Moore Roy Eltham Hayaki Saito Phil Jordan
+ Won Chun Luke Graham Johan Duparc Nathan Reed
+ the Horde3D community Thomas Ruf Ronny Chevalier Nick Verigakis
+ Janez Zemva John Bartholomew Michal Cichon svdijk@github
+ Jonathan Blow Ken Hamada Tero Hanninen Baldur Karlsson
+ Laurent Gomila Cort Stratton Sergio Gonzalez romigrou@github
+ Aruelien Pocheville Thibault Reuille Cass Everitt
+ Ryamond Barbiero Paul Du Bois Engin Manap
+ Blazej Dariusz Roszkowski
+ Michaelangel007@github
+
+
+LICENSE
+
+This software is in the public domain. Where that dedication is not
+recognized, you are granted a perpetual, irrevocable license to copy,
+distribute, and modify this file as you see fit.
+
+*/
+
+#ifndef STBI_INCLUDE_STB_IMAGE_H
+#define STBI_INCLUDE_STB_IMAGE_H
+
+// DOCUMENTATION
+//
+// Limitations:
+// - no 16-bit-per-channel PNG
+// - no 12-bit-per-channel JPEG
+// - no JPEGs with arithmetic coding
+// - no 1-bit BMP
+// - GIF always returns *comp=4
+//
+// Basic usage (see HDR discussion below for HDR usage):
+// int x,y,n;
+// unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+// // ... process data if not NULL ...
+// // ... x = width, y = height, n = # 8-bit components per pixel ...
+// // ... replace '0' with '1'..'4' to force that many components per pixel
+// // ... but 'n' will always be the number that it would have been if you said 0
+// stbi_image_free(data)
+//
+// Standard parameters:
+// int *x -- outputs image width in pixels
+// int *y -- outputs image height in pixels
+// int *comp -- outputs # of image components in image file
+// int req_comp -- if non-zero, # of image components requested in result
+//
+// The return value from an image loader is an 'unsigned char *' which points
+// to the pixel data, or NULL on an allocation failure or if the image is
+// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels,
+// with each pixel consisting of N interleaved 8-bit components; the first
+// pixel pointed to is top-left-most in the image. There is no padding between
+// image scanlines or between pixels, regardless of format. The number of
+// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise.
+// If req_comp is non-zero, *comp has the number of components that _would_
+// have been output otherwise. E.g. if you set req_comp to 4, you will always
+// get RGBA output, but you can check *comp to see if it's trivially opaque
+// because e.g. there were only 3 channels in the source image.
+//
+// An output image with N components has the following components interleaved
+// in this order in each pixel:
+//
+// N=#comp components
+// 1 grey
+// 2 grey, alpha
+// 3 red, green, blue
+// 4 red, green, blue, alpha
+//
+// If image loading fails for any reason, the return value will be NULL,
+// and *x, *y, *comp will be unchanged. The function stbi_failure_reason()
+// can be queried for an extremely brief, end-user unfriendly explanation
+// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid
+// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
+// more user-friendly ones.
+//
+// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
+//
+// ===========================================================================
+//
+// Philosophy
+//
+// stb libraries are designed with the following priorities:
+//
+// 1. easy to use
+// 2. easy to maintain
+// 3. good performance
+//
+// Sometimes I let "good performance" creep up in priority over "easy to maintain",
+// and for best performance I may provide less-easy-to-use APIs that give higher
+// performance, in addition to the easy to use ones. Nevertheless, it's important
+// to keep in mind that from the standpoint of you, a client of this library,
+// all you care about is #1 and #3, and stb libraries do not emphasize #3 above all.
+//
+// Some secondary priorities arise directly from the first two, some of which
+// make more explicit reasons why performance can't be emphasized.
+//
+// - Portable ("ease of use")
+// - Small footprint ("easy to maintain")
+// - No dependencies ("ease of use")
+//
+// ===========================================================================
+//
+// I/O callbacks
+//
+// I/O callbacks allow you to read from arbitrary sources, like packaged
+// files or some other source. Data read from callbacks are processed
+// through a small internal buffer (currently 128 bytes) to try to reduce
+// overhead.
+//
+// The three functions you must define are "read" (reads some bytes of data),
+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
+//
+// ===========================================================================
+//
+// SIMD support
+//
+// The JPEG decoder will try to automatically use SIMD kernels on x86 when
+// supported by the compiler. For ARM Neon support, you must explicitly
+// request it.
+//
+// (The old do-it-yourself SIMD API is no longer supported in the current
+// code.)
+//
+// On x86, SSE2 will automatically be used when available based on a run-time
+// test; if not, the generic C versions are used as a fall-back. On ARM targets,
+// the typical path is to have separate builds for NEON and non-NEON devices
+// (at least this is true for iOS and Android). Therefore, the NEON support is
+// toggled by a build flag: define STBI_NEON to get NEON loops.
+//
+// The output of the JPEG decoder is slightly different from versions where
+// SIMD support was introduced (that is, for versions before 1.49). The
+// difference is only +-1 in the 8-bit RGB channels, and only on a small
+// fraction of pixels. You can force the pre-1.49 behavior by defining
+// STBI_JPEG_OLD, but this will disable some of the SIMD decoding path
+// and hence cost some performance.
+//
+// If for some reason you do not want to use any of SIMD code, or if
+// you have issues compiling it, you can disable it entirely by
+// defining STBI_NO_SIMD.
+//
+// ===========================================================================
+//
+// HDR image support (disable by defining STBI_NO_HDR)
+//
+// stb_image now supports loading HDR images in general, and currently
+// the Radiance .HDR file format, although the support is provided
+// generically. You can still load any file through the existing interface;
+// if you attempt to load an HDR file, it will be automatically remapped to
+// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
+// both of these constants can be reconfigured through this interface:
+//
+// stbi_hdr_to_ldr_gamma(2.2f);
+// stbi_hdr_to_ldr_scale(1.0f);
+//
+// (note, do not use _inverse_ constants; stbi_image will invert them
+// appropriately).
+//
+// Additionally, there is a new, parallel interface for loading files as
+// (linear) floats to preserve the full dynamic range:
+//
+// float *data = stbi_loadf(filename, &x, &y, &n, 0);
+//
+// If you load LDR images through this interface, those images will
+// be promoted to floating point values, run through the inverse of
+// constants corresponding to the above:
+//
+// stbi_ldr_to_hdr_scale(1.0f);
+// stbi_ldr_to_hdr_gamma(2.2f);
+//
+// Finally, given a filename (or an open file or memory block--see header
+// file for details) containing image data, you can query for the "most
+// appropriate" interface to use (that is, whether the image is HDR or
+// not), using:
+//
+// stbi_is_hdr(char *filename);
+//
+// ===========================================================================
+//
+// iPhone PNG support:
+//
+// By default we convert iphone-formatted PNGs back to RGB, even though
+// they are internally encoded differently. You can disable this conversion
+// by by calling stbi_convert_iphone_png_to_rgb(0), in which case
+// you will always just get the native iphone "format" through (which
+// is BGR stored in RGB).
+//
+// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
+// pixel to remove any premultiplied alpha *only* if the image file explicitly
+// says there's premultiplied data (currently only happens in iPhone images,
+// and only if iPhone convert-to-rgb processing is on).
+//
+
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif // STBI_NO_STDIO
+
+#define STBI_VERSION 1
+
+enum
+{
+ STBI_default = 0, // only used for req_comp
+
+ STBI_grey = 1,
+ STBI_grey_alpha = 2,
+ STBI_rgb = 3,
+ STBI_rgb_alpha = 4
+};
+
+typedef unsigned char stbi_uc;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef STB_IMAGE_STATIC
+#define STBIDEF static
+#else
+#define STBIDEF extern
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// PRIMARY API - works on images of any type
+//
+
+//
+// load image by filename, open file, or memory buffer
+//
+
+typedef struct
+{
+ int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read
+ void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative
+ int (*eof) (void *user); // returns nonzero if we are at end of file/data
+} stbi_io_callbacks;
+
+STBIDEF stbi_uc *stbi_load (char const *filename, int *x, int *y, int *comp, int req_comp);
+STBIDEF stbi_uc *stbi_load_from_memory (stbi_uc const *buffer, int len , int *x, int *y, int *comp, int req_comp);
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *comp, int req_comp);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
+// for stbi_load_from_file, file pointer is left pointing immediately after image
+#endif
+
+#ifndef STBI_NO_LINEAR
+ STBIDEF float *stbi_loadf (char const *filename, int *x, int *y, int *comp, int req_comp);
+ STBIDEF float *stbi_loadf_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
+ STBIDEF float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
+
+ #ifndef STBI_NO_STDIO
+ STBIDEF float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
+ #endif
+#endif
+
+#ifndef STBI_NO_HDR
+ STBIDEF void stbi_hdr_to_ldr_gamma(float gamma);
+ STBIDEF void stbi_hdr_to_ldr_scale(float scale);
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_LINEAR
+ STBIDEF void stbi_ldr_to_hdr_gamma(float gamma);
+ STBIDEF void stbi_ldr_to_hdr_scale(float scale);
+#endif // STBI_NO_LINEAR
+
+// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_is_hdr (char const *filename);
+STBIDEF int stbi_is_hdr_from_file(FILE *f);
+#endif // STBI_NO_STDIO
+
+
+// get a VERY brief reason for failure
+// NOT THREADSAFE
+STBIDEF const char *stbi_failure_reason (void);
+
+// free the loaded image -- this is just free()
+STBIDEF void stbi_image_free (void *retval_from_stbi_load);
+
+// get image dimensions & components without fully decoding
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp);
+STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp);
+
+#endif
+
+
+
+// for image formats that explicitly notate that they have premultiplied alpha,
+// we just return the colors as stored in the file. set this flag to force
+// unpremultiplication. results are undefined if the unpremultiply overflow.
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
+
+// indicate whether we should process iphone images back to canonical format,
+// or just pass them through "as-is"
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
+
+// flip the image vertically, so the first pixel in the output array is the bottom left
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
+
+// ZLIB client - used by PNG, available for other purposes
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header);
+STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+//// end header file /////////////////////////////////////////////////////
+#endif // STBI_INCLUDE_STB_IMAGE_H
+
+#ifdef STB_IMAGE_IMPLEMENTATION
+
+#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \
+ || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \
+ || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \
+ || defined(STBI_ONLY_ZLIB)
+ #ifndef STBI_ONLY_JPEG
+ #define STBI_NO_JPEG
+ #endif
+ #ifndef STBI_ONLY_PNG
+ #define STBI_NO_PNG
+ #endif
+ #ifndef STBI_ONLY_BMP
+ #define STBI_NO_BMP
+ #endif
+ #ifndef STBI_ONLY_PSD
+ #define STBI_NO_PSD
+ #endif
+ #ifndef STBI_ONLY_TGA
+ #define STBI_NO_TGA
+ #endif
+ #ifndef STBI_ONLY_GIF
+ #define STBI_NO_GIF
+ #endif
+ #ifndef STBI_ONLY_HDR
+ #define STBI_NO_HDR
+ #endif
+ #ifndef STBI_ONLY_PIC
+ #define STBI_NO_PIC
+ #endif
+ #ifndef STBI_ONLY_PNM
+ #define STBI_NO_PNM
+ #endif
+#endif
+
+#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
+#define STBI_NO_ZLIB
+#endif
+
+
+#include <stdarg.h>
+#include <stddef.h> // ptrdiff_t on osx
+#include <stdlib.h>
+#include <string.h>
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+#include <math.h> // ldexp
+#endif
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif
+
+#ifndef STBI_ASSERT
+#include <assert.h>
+#define STBI_ASSERT(x) assert(x)
+#endif
+
+
+#ifndef _MSC_VER
+ #ifdef __cplusplus
+ #define stbi_inline inline
+ #else
+ #define stbi_inline
+ #endif
+#else
+ #define stbi_inline __forceinline
+#endif
+
+
+#ifdef _MSC_VER
+typedef unsigned short stbi__uint16;
+typedef signed short stbi__int16;
+typedef unsigned int stbi__uint32;
+typedef signed int stbi__int32;
+#else
+#include <stdint.h>
+typedef uint16_t stbi__uint16;
+typedef int16_t stbi__int16;
+typedef uint32_t stbi__uint32;
+typedef int32_t stbi__int32;
+#endif
+
+// should produce compiler error if size is wrong
+typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
+
+#ifdef _MSC_VER
+#define STBI_NOTUSED(v) (void)(v)
+#else
+#define STBI_NOTUSED(v) (void)sizeof(v)
+#endif
+
+#ifdef _MSC_VER
+#define STBI_HAS_LROTL
+#endif
+
+#ifdef STBI_HAS_LROTL
+ #define stbi_lrot(x,y) _lrotl(x,y)
+#else
+ #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y))))
+#endif
+
+#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
+// ok
+#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
+// ok
+#else
+#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
+#endif
+
+#ifndef STBI_MALLOC
+#define STBI_MALLOC(sz) malloc(sz)
+#define STBI_REALLOC(p,newsz) realloc(p,newsz)
+#define STBI_FREE(p) free(p)
+#endif
+
+#ifndef STBI_REALLOC_SIZED
+#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz)
+#endif
+
+// x86/x64 detection
+#if defined(__x86_64__) || defined(_M_X64)
+#define STBI__X64_TARGET
+#elif defined(__i386) || defined(_M_IX86)
+#define STBI__X86_TARGET
+#endif
+
+#if defined(__GNUC__) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
+// NOTE: not clear do we actually need this for the 64-bit path?
+// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
+// (but compiling with -msse2 allows the compiler to use SSE2 everywhere;
+// this is just broken and gcc are jerks for not fixing it properly
+// http://www.virtualdub.org/blog/pivot/entry.php?id=363 )
+#define STBI_NO_SIMD
+#endif
+
+#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
+// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET
+//
+// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
+// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
+// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not
+// simultaneously enabling "-mstackrealign".
+//
+// See https://github.com/nothings/stb/issues/81 for more information.
+//
+// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
+// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2.
+#define STBI_NO_SIMD
+#endif
+
+#if !defined(STBI_NO_SIMD) && defined(STBI__X86_TARGET)
+#define STBI_SSE2
+#include <emmintrin.h>
+
+#ifdef _MSC_VER
+
+#if _MSC_VER >= 1400 // not VC6
+#include <intrin.h> // __cpuid
+static int stbi__cpuid3(void)
+{
+ int info[4];
+ __cpuid(info,1);
+ return info[3];
+}
+#else
+static int stbi__cpuid3(void)
+{
+ int res;
+ __asm {
+ mov eax,1
+ cpuid
+ mov res,edx
+ }
+ return res;
+}
+#endif
+
+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
+
+static int stbi__sse2_available()
+{
+ int info3 = stbi__cpuid3();
+ return ((info3 >> 26) & 1) != 0;
+}
+#else // assume GCC-style if not VC++
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+
+static int stbi__sse2_available()
+{
+#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later
+ // GCC 4.8+ has a nice way to do this
+ return __builtin_cpu_supports("sse2");
+#else
+ // portable way to do this, preferably without using GCC inline ASM?
+ // just bail for now.
+ return 0;
+#endif
+}
+#endif
+#endif
+
+// ARM NEON
+#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
+#undef STBI_NEON
+#endif
+
+#ifdef STBI_NEON
+#include <arm_neon.h>
+// assume GCC or Clang on ARM targets
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+#endif
+
+#ifndef STBI_SIMD_ALIGN
+#define STBI_SIMD_ALIGN(type, name) type name
+#endif
+
+///////////////////////////////////////////////
+//
+// stbi__context struct and start_xxx functions
+
+// stbi__context structure is our basic context used by all images, so it
+// contains all the IO context, plus some basic image information
+typedef struct
+{
+ stbi__uint32 img_x, img_y;
+ int img_n, img_out_n;
+
+ stbi_io_callbacks io;
+ void *io_user_data;
+
+ int read_from_callbacks;
+ int buflen;
+ stbi_uc buffer_start[128];
+
+ stbi_uc *img_buffer, *img_buffer_end;
+ stbi_uc *img_buffer_original, *img_buffer_original_end;
+} stbi__context;
+
+
+static void stbi__refill_buffer(stbi__context *s);
+
+// initialize a memory-decode context
+static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len)
+{
+ s->io.read = NULL;
+ s->read_from_callbacks = 0;
+ s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer;
+ s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len;
+}
+
+// initialize a callback-based context
+static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user)
+{
+ s->io = *c;
+ s->io_user_data = user;
+ s->buflen = sizeof(s->buffer_start);
+ s->read_from_callbacks = 1;
+ s->img_buffer_original = s->buffer_start;
+ stbi__refill_buffer(s);
+ s->img_buffer_original_end = s->img_buffer_end;
+}
+
+#ifndef STBI_NO_STDIO
+
+static int stbi__stdio_read(void *user, char *data, int size)
+{
+ return (int) fread(data,1,size,(FILE*) user);
+}
+
+static void stbi__stdio_skip(void *user, int n)
+{
+ fseek((FILE*) user, n, SEEK_CUR);
+}
+
+static int stbi__stdio_eof(void *user)
+{
+ return feof((FILE*) user);
+}
+
+static stbi_io_callbacks stbi__stdio_callbacks =
+{
+ stbi__stdio_read,
+ stbi__stdio_skip,
+ stbi__stdio_eof,
+};
+
+static void stbi__start_file(stbi__context *s, FILE *f)
+{
+ stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f);
+}
+
+//static void stop_file(stbi__context *s) { }
+
+#endif // !STBI_NO_STDIO
+
+static void stbi__rewind(stbi__context *s)
+{
+ // conceptually rewind SHOULD rewind to the beginning of the stream,
+ // but we just rewind to the beginning of the initial buffer, because
+ // we only use it after doing 'test', which only ever looks at at most 92 bytes
+ s->img_buffer = s->img_buffer_original;
+ s->img_buffer_end = s->img_buffer_original_end;
+}
+
+#ifndef STBI_NO_JPEG
+static int stbi__jpeg_test(stbi__context *s);
+static stbi_uc *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNG
+static int stbi__png_test(stbi__context *s);
+static stbi_uc *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test(stbi__context *s);
+static stbi_uc *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_TGA
+static int stbi__tga_test(stbi__context *s);
+static stbi_uc *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context *s);
+static stbi_uc *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_HDR
+static int stbi__hdr_test(stbi__context *s);
+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_test(stbi__context *s);
+static stbi_uc *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_GIF
+static int stbi__gif_test(stbi__context *s);
+static stbi_uc *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNM
+static int stbi__pnm_test(stbi__context *s);
+static stbi_uc *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+// this is not threadsafe
+static const char *stbi__g_failure_reason;
+
+STBIDEF const char *stbi_failure_reason(void)
+{
+ return stbi__g_failure_reason;
+}
+
+static int stbi__err(const char *str)
+{
+ stbi__g_failure_reason = str;
+ return 0;
+}
+
+static void *stbi__malloc(size_t size)
+{
+ return STBI_MALLOC(size);
+}
+
+// stbi__err - error
+// stbi__errpf - error returning pointer to float
+// stbi__errpuc - error returning pointer to unsigned char
+
+#ifdef STBI_NO_FAILURE_STRINGS
+ #define stbi__err(x,y) 0
+#elif defined(STBI_FAILURE_USERMSG)
+ #define stbi__err(x,y) stbi__err(y)
+#else
+ #define stbi__err(x,y) stbi__err(x)
+#endif
+
+#define stbi__errpf(x,y) ((float *)(size_t) (stbi__err(x,y)?NULL:NULL))
+#define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL))
+
+STBIDEF void stbi_image_free(void *retval_from_stbi_load)
+{
+ STBI_FREE(retval_from_stbi_load);
+}
+
+#ifndef STBI_NO_LINEAR
+static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
+#endif
+
+#ifndef STBI_NO_HDR
+static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp);
+#endif
+
+static int stbi__vertically_flip_on_load = 0;
+
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
+{
+ stbi__vertically_flip_on_load = flag_true_if_should_flip;
+}
+
+static unsigned char *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ #ifndef STBI_NO_JPEG
+ if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp);
+ #endif
+ #ifndef STBI_NO_PNG
+ if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp);
+ #endif
+ #ifndef STBI_NO_BMP
+ if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp);
+ #endif
+ #ifndef STBI_NO_GIF
+ if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp);
+ #endif
+ #ifndef STBI_NO_PSD
+ if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp);
+ #endif
+ #ifndef STBI_NO_PIC
+ if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp);
+ #endif
+ #ifndef STBI_NO_PNM
+ if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp);
+ #endif
+
+ #ifndef STBI_NO_HDR
+ if (stbi__hdr_test(s)) {
+ float *hdr = stbi__hdr_load(s, x,y,comp,req_comp);
+ return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
+ }
+ #endif
+
+ #ifndef STBI_NO_TGA
+ // test tga last because it's a crappy test!
+ if (stbi__tga_test(s))
+ return stbi__tga_load(s,x,y,comp,req_comp);
+ #endif
+
+ return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
+}
+
+static unsigned char *stbi__load_flip(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ unsigned char *result = stbi__load_main(s, x, y, comp, req_comp);
+
+ if (stbi__vertically_flip_on_load && result != NULL) {
+ int w = *x, h = *y;
+ int depth = req_comp ? req_comp : *comp;
+ int row,col,z;
+ stbi_uc temp;
+
+ // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
+ for (row = 0; row < (h>>1); row++) {
+ for (col = 0; col < w; col++) {
+ for (z = 0; z < depth; z++) {
+ temp = result[(row * w + col) * depth + z];
+ result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z];
+ result[((h - row - 1) * w + col) * depth + z] = temp;
+ }
+ }
+ }
+ }
+
+ return result;
+}
+
+#ifndef STBI_NO_HDR
+static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp)
+{
+ if (stbi__vertically_flip_on_load && result != NULL) {
+ int w = *x, h = *y;
+ int depth = req_comp ? req_comp : *comp;
+ int row,col,z;
+ float temp;
+
+ // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
+ for (row = 0; row < (h>>1); row++) {
+ for (col = 0; col < w; col++) {
+ for (z = 0; z < depth; z++) {
+ temp = result[(row * w + col) * depth + z];
+ result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z];
+ result[((h - row - 1) * w + col) * depth + z] = temp;
+ }
+ }
+ }
+ }
+}
+#endif
+
+#ifndef STBI_NO_STDIO
+
+static FILE *stbi__fopen(char const *filename, char const *mode)
+{
+ FILE *f;
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+ if (0 != fopen_s(&f, filename, mode))
+ f=0;
+#else
+ f = fopen(filename, mode);
+#endif
+ return f;
+}
+
+
+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+ FILE *f = stbi__fopen(filename, "rb");
+ unsigned char *result;
+ if (!f) return stbi__errpuc("can't fopen", "Unable to open file");
+ result = stbi_load_from_file(f,x,y,comp,req_comp);
+ fclose(f);
+ return result;
+}
+
+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+ unsigned char *result;
+ stbi__context s;
+ stbi__start_file(&s,f);
+ result = stbi__load_flip(&s,x,y,comp,req_comp);
+ if (result) {
+ // need to 'unget' all the characters in the IO buffer
+ fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
+ }
+ return result;
+}
+#endif //!STBI_NO_STDIO
+
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+ stbi__context s;
+ stbi__start_mem(&s,buffer,len);
+ return stbi__load_flip(&s,x,y,comp,req_comp);
+}
+
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+ return stbi__load_flip(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_LINEAR
+static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ unsigned char *data;
+ #ifndef STBI_NO_HDR
+ if (stbi__hdr_test(s)) {
+ float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp);
+ if (hdr_data)
+ stbi__float_postprocess(hdr_data,x,y,comp,req_comp);
+ return hdr_data;
+ }
+ #endif
+ data = stbi__load_flip(s, x, y, comp, req_comp);
+ if (data)
+ return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
+ return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");
+}
+
+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+ stbi__context s;
+ stbi__start_mem(&s,buffer,len);
+ return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+
+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+ return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+ float *result;
+ FILE *f = stbi__fopen(filename, "rb");
+ if (!f) return stbi__errpf("can't fopen", "Unable to open file");
+ result = stbi_loadf_from_file(f,x,y,comp,req_comp);
+ fclose(f);
+ return result;
+}
+
+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+ stbi__context s;
+ stbi__start_file(&s,f);
+ return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+#endif // !STBI_NO_STDIO
+
+#endif // !STBI_NO_LINEAR
+
+// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is
+// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always
+// reports false!
+
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
+{
+ #ifndef STBI_NO_HDR
+ stbi__context s;
+ stbi__start_mem(&s,buffer,len);
+ return stbi__hdr_test(&s);
+ #else
+ STBI_NOTUSED(buffer);
+ STBI_NOTUSED(len);
+ return 0;
+ #endif
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_is_hdr (char const *filename)
+{
+ FILE *f = stbi__fopen(filename, "rb");
+ int result=0;
+ if (f) {
+ result = stbi_is_hdr_from_file(f);
+ fclose(f);
+ }
+ return result;
+}
+
+STBIDEF int stbi_is_hdr_from_file(FILE *f)
+{
+ #ifndef STBI_NO_HDR
+ stbi__context s;
+ stbi__start_file(&s,f);
+ return stbi__hdr_test(&s);
+ #else
+ STBI_NOTUSED(f);
+ return 0;
+ #endif
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
+{
+ #ifndef STBI_NO_HDR
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+ return stbi__hdr_test(&s);
+ #else
+ STBI_NOTUSED(clbk);
+ STBI_NOTUSED(user);
+ return 0;
+ #endif
+}
+
+#ifndef STBI_NO_LINEAR
+static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f;
+
+STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
+STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
+#endif
+
+static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f;
+
+STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; }
+STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; }
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Common code used by all image loaders
+//
+
+enum
+{
+ STBI__SCAN_load=0,
+ STBI__SCAN_type,
+ STBI__SCAN_header
+};
+
+static void stbi__refill_buffer(stbi__context *s)
+{
+ int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
+ if (n == 0) {
+ // at end of file, treat same as if from memory, but need to handle case
+ // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
+ s->read_from_callbacks = 0;
+ s->img_buffer = s->buffer_start;
+ s->img_buffer_end = s->buffer_start+1;
+ *s->img_buffer = 0;
+ } else {
+ s->img_buffer = s->buffer_start;
+ s->img_buffer_end = s->buffer_start + n;
+ }
+}
+
+stbi_inline static stbi_uc stbi__get8(stbi__context *s)
+{
+ if (s->img_buffer < s->img_buffer_end)
+ return *s->img_buffer++;
+ if (s->read_from_callbacks) {
+ stbi__refill_buffer(s);
+ return *s->img_buffer++;
+ }
+ return 0;
+}
+
+stbi_inline static int stbi__at_eof(stbi__context *s)
+{
+ if (s->io.read) {
+ if (!(s->io.eof)(s->io_user_data)) return 0;
+ // if feof() is true, check if buffer = end
+ // special case: we've only got the special 0 character at the end
+ if (s->read_from_callbacks == 0) return 1;
+ }
+
+ return s->img_buffer >= s->img_buffer_end;
+}
+
+static void stbi__skip(stbi__context *s, int n)
+{
+ if (n < 0) {
+ s->img_buffer = s->img_buffer_end;
+ return;
+ }
+ if (s->io.read) {
+ int blen = (int) (s->img_buffer_end - s->img_buffer);
+ if (blen < n) {
+ s->img_buffer = s->img_buffer_end;
+ (s->io.skip)(s->io_user_data, n - blen);
+ return;
+ }
+ }
+ s->img_buffer += n;
+}
+
+static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n)
+{
+ if (s->io.read) {
+ int blen = (int) (s->img_buffer_end - s->img_buffer);
+ if (blen < n) {
+ int res, count;
+
+ memcpy(buffer, s->img_buffer, blen);
+
+ count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen);
+ res = (count == (n-blen));
+ s->img_buffer = s->img_buffer_end;
+ return res;
+ }
+ }
+
+ if (s->img_buffer+n <= s->img_buffer_end) {
+ memcpy(buffer, s->img_buffer, n);
+ s->img_buffer += n;
+ return 1;
+ } else
+ return 0;
+}
+
+static int stbi__get16be(stbi__context *s)
+{
+ int z = stbi__get8(s);
+ return (z << 8) + stbi__get8(s);
+}
+
+static stbi__uint32 stbi__get32be(stbi__context *s)
+{
+ stbi__uint32 z = stbi__get16be(s);
+ return (z << 16) + stbi__get16be(s);
+}
+
+#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
+// nothing
+#else
+static int stbi__get16le(stbi__context *s)
+{
+ int z = stbi__get8(s);
+ return z + (stbi__get8(s) << 8);
+}
+#endif
+
+#ifndef STBI_NO_BMP
+static stbi__uint32 stbi__get32le(stbi__context *s)
+{
+ stbi__uint32 z = stbi__get16le(s);
+ return z + (stbi__get16le(s) << 16);
+}
+#endif
+
+#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// generic converter from built-in img_n to req_comp
+// individual types do this automatically as much as possible (e.g. jpeg
+// does all cases internally since it needs to colorspace convert anyway,
+// and it never has alpha, so very few cases ). png can automatically
+// interleave an alpha=255 channel, but falls back to this for other cases
+//
+// assume data buffer is malloced, so malloc a new one and free that one
+// only failure mode is malloc failing
+
+static stbi_uc stbi__compute_y(int r, int g, int b)
+{
+ return (stbi_uc) (((r*77) + (g*150) + (29*b)) >> 8);
+}
+
+static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y)
+{
+ int i,j;
+ unsigned char *good;
+
+ if (req_comp == img_n) return data;
+ STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+ good = (unsigned char *) stbi__malloc(req_comp * x * y);
+ if (good == NULL) {
+ STBI_FREE(data);
+ return stbi__errpuc("outofmem", "Out of memory");
+ }
+
+ for (j=0; j < (int) y; ++j) {
+ unsigned char *src = data + j * x * img_n ;
+ unsigned char *dest = good + j * x * req_comp;
+
+ #define COMBO(a,b) ((a)*8+(b))
+ #define CASE(a,b) case COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
+ // convert source image with img_n components to one with req_comp components;
+ // avoid switch per pixel, so use switch per scanline and massive macros
+ switch (COMBO(img_n, req_comp)) {
+ CASE(1,2) dest[0]=src[0], dest[1]=255; break;
+ CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break;
+ CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break;
+ CASE(2,1) dest[0]=src[0]; break;
+ CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break;
+ CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break;
+ CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break;
+ CASE(3,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break;
+ CASE(3,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = 255; break;
+ CASE(4,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break;
+ CASE(4,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break;
+ CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break;
+ default: STBI_ASSERT(0);
+ }
+ #undef CASE
+ }
+
+ STBI_FREE(data);
+ return good;
+}
+
+#ifndef STBI_NO_LINEAR
+static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
+{
+ int i,k,n;
+ float *output = (float *) stbi__malloc(x * y * comp * sizeof(float));
+ if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); }
+ // compute number of non-alpha components
+ if (comp & 1) n = comp; else n = comp-1;
+ for (i=0; i < x*y; ++i) {
+ for (k=0; k < n; ++k) {
+ output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
+ }
+ if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f;
+ }
+ STBI_FREE(data);
+ return output;
+}
+#endif
+
+#ifndef STBI_NO_HDR
+#define stbi__float2int(x) ((int) (x))
+static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp)
+{
+ int i,k,n;
+ stbi_uc *output = (stbi_uc *) stbi__malloc(x * y * comp);
+ if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); }
+ // compute number of non-alpha components
+ if (comp & 1) n = comp; else n = comp-1;
+ for (i=0; i < x*y; ++i) {
+ for (k=0; k < n; ++k) {
+ float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
+ if (z < 0) z = 0;
+ if (z > 255) z = 255;
+ output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+ }
+ if (k < comp) {
+ float z = data[i*comp+k] * 255 + 0.5f;
+ if (z < 0) z = 0;
+ if (z > 255) z = 255;
+ output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+ }
+ }
+ STBI_FREE(data);
+ return output;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// "baseline" JPEG/JFIF decoder
+//
+// simple implementation
+// - doesn't support delayed output of y-dimension
+// - simple interface (only one output format: 8-bit interleaved RGB)
+// - doesn't try to recover corrupt jpegs
+// - doesn't allow partial loading, loading multiple at once
+// - still fast on x86 (copying globals into locals doesn't help x86)
+// - allocates lots of intermediate memory (full size of all components)
+// - non-interleaved case requires this anyway
+// - allows good upsampling (see next)
+// high-quality
+// - upsampled channels are bilinearly interpolated, even across blocks
+// - quality integer IDCT derived from IJG's 'slow'
+// performance
+// - fast huffman; reasonable integer IDCT
+// - some SIMD kernels for common paths on targets with SSE2/NEON
+// - uses a lot of intermediate memory, could cache poorly
+
+#ifndef STBI_NO_JPEG
+
+// huffman decoding acceleration
+#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache
+
+typedef struct
+{
+ stbi_uc fast[1 << FAST_BITS];
+ // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
+ stbi__uint16 code[256];
+ stbi_uc values[256];
+ stbi_uc size[257];
+ unsigned int maxcode[18];
+ int delta[17]; // old 'firstsymbol' - old 'firstcode'
+} stbi__huffman;
+
+typedef struct
+{
+ stbi__context *s;
+ stbi__huffman huff_dc[4];
+ stbi__huffman huff_ac[4];
+ stbi_uc dequant[4][64];
+ stbi__int16 fast_ac[4][1 << FAST_BITS];
+
+// sizes for components, interleaved MCUs
+ int img_h_max, img_v_max;
+ int img_mcu_x, img_mcu_y;
+ int img_mcu_w, img_mcu_h;
+
+// definition of jpeg image component
+ struct
+ {
+ int id;
+ int h,v;
+ int tq;
+ int hd,ha;
+ int dc_pred;
+
+ int x,y,w2,h2;
+ stbi_uc *data;
+ void *raw_data, *raw_coeff;
+ stbi_uc *linebuf;
+ short *coeff; // progressive only
+ int coeff_w, coeff_h; // number of 8x8 coefficient blocks
+ } img_comp[4];
+
+ stbi__uint32 code_buffer; // jpeg entropy-coded buffer
+ int code_bits; // number of valid bits
+ unsigned char marker; // marker seen while filling entropy buffer
+ int nomore; // flag if we saw a marker so must stop
+
+ int progressive;
+ int spec_start;
+ int spec_end;
+ int succ_high;
+ int succ_low;
+ int eob_run;
+
+ int scan_n, order[4];
+ int restart_interval, todo;
+
+// kernels
+ void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
+ void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step);
+ stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs);
+} stbi__jpeg;
+
+static int stbi__build_huffman(stbi__huffman *h, int *count)
+{
+ int i,j,k=0,code;
+ // build size list for each symbol (from JPEG spec)
+ for (i=0; i < 16; ++i)
+ for (j=0; j < count[i]; ++j)
+ h->size[k++] = (stbi_uc) (i+1);
+ h->size[k] = 0;
+
+ // compute actual symbols (from jpeg spec)
+ code = 0;
+ k = 0;
+ for(j=1; j <= 16; ++j) {
+ // compute delta to add to code to compute symbol id
+ h->delta[j] = k - code;
+ if (h->size[k] == j) {
+ while (h->size[k] == j)
+ h->code[k++] = (stbi__uint16) (code++);
+ if (code-1 >= (1 << j)) return stbi__err("bad code lengths","Corrupt JPEG");
+ }
+ // compute largest code + 1 for this size, preshifted as needed later
+ h->maxcode[j] = code << (16-j);
+ code <<= 1;
+ }
+ h->maxcode[j] = 0xffffffff;
+
+ // build non-spec acceleration table; 255 is flag for not-accelerated
+ memset(h->fast, 255, 1 << FAST_BITS);
+ for (i=0; i < k; ++i) {
+ int s = h->size[i];
+ if (s <= FAST_BITS) {
+ int c = h->code[i] << (FAST_BITS-s);
+ int m = 1 << (FAST_BITS-s);
+ for (j=0; j < m; ++j) {
+ h->fast[c+j] = (stbi_uc) i;
+ }
+ }
+ }
+ return 1;
+}
+
+// build a table that decodes both magnitude and value of small ACs in
+// one go.
+static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h)
+{
+ int i;
+ for (i=0; i < (1 << FAST_BITS); ++i) {
+ stbi_uc fast = h->fast[i];
+ fast_ac[i] = 0;
+ if (fast < 255) {
+ int rs = h->values[fast];
+ int run = (rs >> 4) & 15;
+ int magbits = rs & 15;
+ int len = h->size[fast];
+
+ if (magbits && len + magbits <= FAST_BITS) {
+ // magnitude code followed by receive_extend code
+ int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
+ int m = 1 << (magbits - 1);
+ if (k < m) k += (-1 << magbits) + 1;
+ // if the result is small enough, we can fit it in fast_ac table
+ if (k >= -128 && k <= 127)
+ fast_ac[i] = (stbi__int16) ((k << 8) + (run << 4) + (len + magbits));
+ }
+ }
+ }
+}
+
+static void stbi__grow_buffer_unsafe(stbi__jpeg *j)
+{
+ do {
+ int b = j->nomore ? 0 : stbi__get8(j->s);
+ if (b == 0xff) {
+ int c = stbi__get8(j->s);
+ if (c != 0) {
+ j->marker = (unsigned char) c;
+ j->nomore = 1;
+ return;
+ }
+ }
+ j->code_buffer |= b << (24 - j->code_bits);
+ j->code_bits += 8;
+ } while (j->code_bits <= 24);
+}
+
+// (1 << n) - 1
+static stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};
+
+// decode a jpeg huffman value from the bitstream
+stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
+{
+ unsigned int temp;
+ int c,k;
+
+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+ // look at the top FAST_BITS and determine what symbol ID it is,
+ // if the code is <= FAST_BITS
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+ k = h->fast[c];
+ if (k < 255) {
+ int s = h->size[k];
+ if (s > j->code_bits)
+ return -1;
+ j->code_buffer <<= s;
+ j->code_bits -= s;
+ return h->values[k];
+ }
+
+ // naive test is to shift the code_buffer down so k bits are
+ // valid, then test against maxcode. To speed this up, we've
+ // preshifted maxcode left so that it has (16-k) 0s at the
+ // end; in other words, regardless of the number of bits, it
+ // wants to be compared against something shifted to have 16;
+ // that way we don't need to shift inside the loop.
+ temp = j->code_buffer >> 16;
+ for (k=FAST_BITS+1 ; ; ++k)
+ if (temp < h->maxcode[k])
+ break;
+ if (k == 17) {
+ // error! code not found
+ j->code_bits -= 16;
+ return -1;
+ }
+
+ if (k > j->code_bits)
+ return -1;
+
+ // convert the huffman code to the symbol id
+ c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
+ STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
+
+ // convert the id to a symbol
+ j->code_bits -= k;
+ j->code_buffer <<= k;
+ return h->values[c];
+}
+
+// bias[n] = (-1<<n) + 1
+static int const stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767};
+
+// combined JPEG 'receive' and JPEG 'extend', since baseline
+// always extends everything it receives.
+stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
+{
+ unsigned int k;
+ int sgn;
+ if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+
+ sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB
+ k = stbi_lrot(j->code_buffer, n);
+ STBI_ASSERT(n >= 0 && n < (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask)));
+ j->code_buffer = k & ~stbi__bmask[n];
+ k &= stbi__bmask[n];
+ j->code_bits -= n;
+ return k + (stbi__jbias[n] & ~sgn);
+}
+
+// get some unsigned bits
+stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
+{
+ unsigned int k;
+ if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+ k = stbi_lrot(j->code_buffer, n);
+ j->code_buffer = k & ~stbi__bmask[n];
+ k &= stbi__bmask[n];
+ j->code_bits -= n;
+ return k;
+}
+
+stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
+{
+ unsigned int k;
+ if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
+ k = j->code_buffer;
+ j->code_buffer <<= 1;
+ --j->code_bits;
+ return k & 0x80000000;
+}
+
+// given a value that's at position X in the zigzag stream,
+// where does it appear in the 8x8 matrix coded as row-major?
+static stbi_uc stbi__jpeg_dezigzag[64+15] =
+{
+ 0, 1, 8, 16, 9, 2, 3, 10,
+ 17, 24, 32, 25, 18, 11, 4, 5,
+ 12, 19, 26, 33, 40, 48, 41, 34,
+ 27, 20, 13, 6, 7, 14, 21, 28,
+ 35, 42, 49, 56, 57, 50, 43, 36,
+ 29, 22, 15, 23, 30, 37, 44, 51,
+ 58, 59, 52, 45, 38, 31, 39, 46,
+ 53, 60, 61, 54, 47, 55, 62, 63,
+ // let corrupt input sample past end
+ 63, 63, 63, 63, 63, 63, 63, 63,
+ 63, 63, 63, 63, 63, 63, 63
+};
+
+// decode one 64-entry block--
+static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi_uc *dequant)
+{
+ int diff,dc,k;
+ int t;
+
+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+ t = stbi__jpeg_huff_decode(j, hdc);
+ if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+
+ // 0 all the ac values now so we can do it 32-bits at a time
+ memset(data,0,64*sizeof(data[0]));
+
+ diff = t ? stbi__extend_receive(j, t) : 0;
+ dc = j->img_comp[b].dc_pred + diff;
+ j->img_comp[b].dc_pred = dc;
+ data[0] = (short) (dc * dequant[0]);
+
+ // decode AC components, see JPEG spec
+ k = 1;
+ do {
+ unsigned int zig;
+ int c,r,s;
+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+ r = fac[c];
+ if (r) { // fast-AC path
+ k += (r >> 4) & 15; // run
+ s = r & 15; // combined length
+ j->code_buffer <<= s;
+ j->code_bits -= s;
+ // decode into unzigzag'd location
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short) ((r >> 8) * dequant[zig]);
+ } else {
+ int rs = stbi__jpeg_huff_decode(j, hac);
+ if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {
+ if (rs != 0xf0) break; // end block
+ k += 16;
+ } else {
+ k += r;
+ // decode into unzigzag'd location
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]);
+ }
+ }
+ } while (k < 64);
+ return 1;
+}
+
+static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b)
+{
+ int diff,dc;
+ int t;
+ if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+ if (j->succ_high == 0) {
+ // first scan for DC coefficient, must be first
+ memset(data,0,64*sizeof(data[0])); // 0 all the ac values now
+ t = stbi__jpeg_huff_decode(j, hdc);
+ diff = t ? stbi__extend_receive(j, t) : 0;
+
+ dc = j->img_comp[b].dc_pred + diff;
+ j->img_comp[b].dc_pred = dc;
+ data[0] = (short) (dc << j->succ_low);
+ } else {
+ // refinement scan for DC coefficient
+ if (stbi__jpeg_get_bit(j))
+ data[0] += (short) (1 << j->succ_low);
+ }
+ return 1;
+}
+
+// @OPTIMIZE: store non-zigzagged during the decode passes,
+// and only de-zigzag when dequantizing
+static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac)
+{
+ int k;
+ if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+ if (j->succ_high == 0) {
+ int shift = j->succ_low;
+
+ if (j->eob_run) {
+ --j->eob_run;
+ return 1;
+ }
+
+ k = j->spec_start;
+ do {
+ unsigned int zig;
+ int c,r,s;
+ if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+ r = fac[c];
+ if (r) { // fast-AC path
+ k += (r >> 4) & 15; // run
+ s = r & 15; // combined length
+ j->code_buffer <<= s;
+ j->code_bits -= s;
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short) ((r >> 8) << shift);
+ } else {
+ int rs = stbi__jpeg_huff_decode(j, hac);
+ if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {
+ if (r < 15) {
+ j->eob_run = (1 << r);
+ if (r)
+ j->eob_run += stbi__jpeg_get_bits(j, r);
+ --j->eob_run;
+ break;
+ }
+ k += 16;
+ } else {
+ k += r;
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short) (stbi__extend_receive(j,s) << shift);
+ }
+ }
+ } while (k <= j->spec_end);
+ } else {
+ // refinement scan for these AC coefficients
+
+ short bit = (short) (1 << j->succ_low);
+
+ if (j->eob_run) {
+ --j->eob_run;
+ for (k = j->spec_start; k <= j->spec_end; ++k) {
+ short *p = &data[stbi__jpeg_dezigzag[k]];
+ if (*p != 0)
+ if (stbi__jpeg_get_bit(j))
+ if ((*p & bit)==0) {
+ if (*p > 0)
+ *p += bit;
+ else
+ *p -= bit;
+ }
+ }
+ } else {
+ k = j->spec_start;
+ do {
+ int r,s;
+ int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh
+ if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {
+ if (r < 15) {
+ j->eob_run = (1 << r) - 1;
+ if (r)
+ j->eob_run += stbi__jpeg_get_bits(j, r);
+ r = 64; // force end of block
+ } else {
+ // r=15 s=0 should write 16 0s, so we just do
+ // a run of 15 0s and then write s (which is 0),
+ // so we don't have to do anything special here
+ }
+ } else {
+ if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG");
+ // sign bit
+ if (stbi__jpeg_get_bit(j))
+ s = bit;
+ else
+ s = -bit;
+ }
+
+ // advance by r
+ while (k <= j->spec_end) {
+ short *p = &data[stbi__jpeg_dezigzag[k++]];
+ if (*p != 0) {
+ if (stbi__jpeg_get_bit(j))
+ if ((*p & bit)==0) {
+ if (*p > 0)
+ *p += bit;
+ else
+ *p -= bit;
+ }
+ } else {
+ if (r == 0) {
+ *p = (short) s;
+ break;
+ }
+ --r;
+ }
+ }
+ } while (k <= j->spec_end);
+ }
+ }
+ return 1;
+}
+
+// take a -128..127 value and stbi__clamp it and convert to 0..255
+stbi_inline static stbi_uc stbi__clamp(int x)
+{
+ // trick to use a single test to catch both cases
+ if ((unsigned int) x > 255) {
+ if (x < 0) return 0;
+ if (x > 255) return 255;
+ }
+ return (stbi_uc) x;
+}
+
+#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5)))
+#define stbi__fsh(x) ((x) << 12)
+
+// derived from jidctint -- DCT_ISLOW
+#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \
+ int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
+ p2 = s2; \
+ p3 = s6; \
+ p1 = (p2+p3) * stbi__f2f(0.5411961f); \
+ t2 = p1 + p3*stbi__f2f(-1.847759065f); \
+ t3 = p1 + p2*stbi__f2f( 0.765366865f); \
+ p2 = s0; \
+ p3 = s4; \
+ t0 = stbi__fsh(p2+p3); \
+ t1 = stbi__fsh(p2-p3); \
+ x0 = t0+t3; \
+ x3 = t0-t3; \
+ x1 = t1+t2; \
+ x2 = t1-t2; \
+ t0 = s7; \
+ t1 = s5; \
+ t2 = s3; \
+ t3 = s1; \
+ p3 = t0+t2; \
+ p4 = t1+t3; \
+ p1 = t0+t3; \
+ p2 = t1+t2; \
+ p5 = (p3+p4)*stbi__f2f( 1.175875602f); \
+ t0 = t0*stbi__f2f( 0.298631336f); \
+ t1 = t1*stbi__f2f( 2.053119869f); \
+ t2 = t2*stbi__f2f( 3.072711026f); \
+ t3 = t3*stbi__f2f( 1.501321110f); \
+ p1 = p5 + p1*stbi__f2f(-0.899976223f); \
+ p2 = p5 + p2*stbi__f2f(-2.562915447f); \
+ p3 = p3*stbi__f2f(-1.961570560f); \
+ p4 = p4*stbi__f2f(-0.390180644f); \
+ t3 += p1+p4; \
+ t2 += p2+p3; \
+ t1 += p2+p4; \
+ t0 += p1+p3;
+
+static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
+{
+ int i,val[64],*v=val;
+ stbi_uc *o;
+ short *d = data;
+
+ // columns
+ for (i=0; i < 8; ++i,++d, ++v) {
+ // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
+ if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
+ && d[40]==0 && d[48]==0 && d[56]==0) {
+ // no shortcut 0 seconds
+ // (1|2|3|4|5|6|7)==0 0 seconds
+ // all separate -0.047 seconds
+ // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds
+ int dcterm = d[0] << 2;
+ v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
+ } else {
+ STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56])
+ // constants scaled things up by 1<<12; let's bring them back
+ // down, but keep 2 extra bits of precision
+ x0 += 512; x1 += 512; x2 += 512; x3 += 512;
+ v[ 0] = (x0+t3) >> 10;
+ v[56] = (x0-t3) >> 10;
+ v[ 8] = (x1+t2) >> 10;
+ v[48] = (x1-t2) >> 10;
+ v[16] = (x2+t1) >> 10;
+ v[40] = (x2-t1) >> 10;
+ v[24] = (x3+t0) >> 10;
+ v[32] = (x3-t0) >> 10;
+ }
+ }
+
+ for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
+ // no fast case since the first 1D IDCT spread components out
+ STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
+ // constants scaled things up by 1<<12, plus we had 1<<2 from first
+ // loop, plus horizontal and vertical each scale by sqrt(8) so together
+ // we've got an extra 1<<3, so 1<<17 total we need to remove.
+ // so we want to round that, which means adding 0.5 * 1<<17,
+ // aka 65536. Also, we'll end up with -128 to 127 that we want
+ // to encode as 0..255 by adding 128, so we'll add that before the shift
+ x0 += 65536 + (128<<17);
+ x1 += 65536 + (128<<17);
+ x2 += 65536 + (128<<17);
+ x3 += 65536 + (128<<17);
+ // tried computing the shifts into temps, or'ing the temps to see
+ // if any were out of range, but that was slower
+ o[0] = stbi__clamp((x0+t3) >> 17);
+ o[7] = stbi__clamp((x0-t3) >> 17);
+ o[1] = stbi__clamp((x1+t2) >> 17);
+ o[6] = stbi__clamp((x1-t2) >> 17);
+ o[2] = stbi__clamp((x2+t1) >> 17);
+ o[5] = stbi__clamp((x2-t1) >> 17);
+ o[3] = stbi__clamp((x3+t0) >> 17);
+ o[4] = stbi__clamp((x3-t0) >> 17);
+ }
+}
+
+#ifdef STBI_SSE2
+// sse2 integer IDCT. not the fastest possible implementation but it
+// produces bit-identical results to the generic C version so it's
+// fully "transparent".
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+ // This is constructed to match our regular (generic) integer IDCT exactly.
+ __m128i row0, row1, row2, row3, row4, row5, row6, row7;
+ __m128i tmp;
+
+ // dot product constant: even elems=x, odd elems=y
+ #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y))
+
+ // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit)
+ // out(1) = c1[even]*x + c1[odd]*y
+ #define dct_rot(out0,out1, x,y,c0,c1) \
+ __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \
+ __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \
+ __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
+ __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
+ __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
+ __m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
+
+ // out = in << 12 (in 16-bit, out 32-bit)
+ #define dct_widen(out, in) \
+ __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
+ __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
+
+ // wide add
+ #define dct_wadd(out, a, b) \
+ __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
+ __m128i out##_h = _mm_add_epi32(a##_h, b##_h)
+
+ // wide sub
+ #define dct_wsub(out, a, b) \
+ __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
+ __m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
+
+ // butterfly a/b, add bias, then shift by "s" and pack
+ #define dct_bfly32o(out0, out1, a,b,bias,s) \
+ { \
+ __m128i abiased_l = _mm_add_epi32(a##_l, bias); \
+ __m128i abiased_h = _mm_add_epi32(a##_h, bias); \
+ dct_wadd(sum, abiased, b); \
+ dct_wsub(dif, abiased, b); \
+ out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \
+ out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \
+ }
+
+ // 8-bit interleave step (for transposes)
+ #define dct_interleave8(a, b) \
+ tmp = a; \
+ a = _mm_unpacklo_epi8(a, b); \
+ b = _mm_unpackhi_epi8(tmp, b)
+
+ // 16-bit interleave step (for transposes)
+ #define dct_interleave16(a, b) \
+ tmp = a; \
+ a = _mm_unpacklo_epi16(a, b); \
+ b = _mm_unpackhi_epi16(tmp, b)
+
+ #define dct_pass(bias,shift) \
+ { \
+ /* even part */ \
+ dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \
+ __m128i sum04 = _mm_add_epi16(row0, row4); \
+ __m128i dif04 = _mm_sub_epi16(row0, row4); \
+ dct_widen(t0e, sum04); \
+ dct_widen(t1e, dif04); \
+ dct_wadd(x0, t0e, t3e); \
+ dct_wsub(x3, t0e, t3e); \
+ dct_wadd(x1, t1e, t2e); \
+ dct_wsub(x2, t1e, t2e); \
+ /* odd part */ \
+ dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \
+ dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \
+ __m128i sum17 = _mm_add_epi16(row1, row7); \
+ __m128i sum35 = _mm_add_epi16(row3, row5); \
+ dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \
+ dct_wadd(x4, y0o, y4o); \
+ dct_wadd(x5, y1o, y5o); \
+ dct_wadd(x6, y2o, y5o); \
+ dct_wadd(x7, y3o, y4o); \
+ dct_bfly32o(row0,row7, x0,x7,bias,shift); \
+ dct_bfly32o(row1,row6, x1,x6,bias,shift); \
+ dct_bfly32o(row2,row5, x2,x5,bias,shift); \
+ dct_bfly32o(row3,row4, x3,x4,bias,shift); \
+ }
+
+ __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
+ __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f));
+ __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
+ __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
+ __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f));
+ __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f));
+ __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f));
+ __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f));
+
+ // rounding biases in column/row passes, see stbi__idct_block for explanation.
+ __m128i bias_0 = _mm_set1_epi32(512);
+ __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17));
+
+ // load
+ row0 = _mm_load_si128((const __m128i *) (data + 0*8));
+ row1 = _mm_load_si128((const __m128i *) (data + 1*8));
+ row2 = _mm_load_si128((const __m128i *) (data + 2*8));
+ row3 = _mm_load_si128((const __m128i *) (data + 3*8));
+ row4 = _mm_load_si128((const __m128i *) (data + 4*8));
+ row5 = _mm_load_si128((const __m128i *) (data + 5*8));
+ row6 = _mm_load_si128((const __m128i *) (data + 6*8));
+ row7 = _mm_load_si128((const __m128i *) (data + 7*8));
+
+ // column pass
+ dct_pass(bias_0, 10);
+
+ {
+ // 16bit 8x8 transpose pass 1
+ dct_interleave16(row0, row4);
+ dct_interleave16(row1, row5);
+ dct_interleave16(row2, row6);
+ dct_interleave16(row3, row7);
+
+ // transpose pass 2
+ dct_interleave16(row0, row2);
+ dct_interleave16(row1, row3);
+ dct_interleave16(row4, row6);
+ dct_interleave16(row5, row7);
+
+ // transpose pass 3
+ dct_interleave16(row0, row1);
+ dct_interleave16(row2, row3);
+ dct_interleave16(row4, row5);
+ dct_interleave16(row6, row7);
+ }
+
+ // row pass
+ dct_pass(bias_1, 17);
+
+ {
+ // pack
+ __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
+ __m128i p1 = _mm_packus_epi16(row2, row3);
+ __m128i p2 = _mm_packus_epi16(row4, row5);
+ __m128i p3 = _mm_packus_epi16(row6, row7);
+
+ // 8bit 8x8 transpose pass 1
+ dct_interleave8(p0, p2); // a0e0a1e1...
+ dct_interleave8(p1, p3); // c0g0c1g1...
+
+ // transpose pass 2
+ dct_interleave8(p0, p1); // a0c0e0g0...
+ dct_interleave8(p2, p3); // b0d0f0h0...
+
+ // transpose pass 3
+ dct_interleave8(p0, p2); // a0b0c0d0...
+ dct_interleave8(p1, p3); // a4b4c4d4...
+
+ // store
+ _mm_storel_epi64((__m128i *) out, p0); out += out_stride;
+ _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride;
+ _mm_storel_epi64((__m128i *) out, p2); out += out_stride;
+ _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride;
+ _mm_storel_epi64((__m128i *) out, p1); out += out_stride;
+ _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride;
+ _mm_storel_epi64((__m128i *) out, p3); out += out_stride;
+ _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e));
+ }
+
+#undef dct_const
+#undef dct_rot
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_interleave8
+#undef dct_interleave16
+#undef dct_pass
+}
+
+#endif // STBI_SSE2
+
+#ifdef STBI_NEON
+
+// NEON integer IDCT. should produce bit-identical
+// results to the generic C version.
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+ int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
+
+ int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
+ int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
+ int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f));
+ int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f));
+ int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
+ int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
+ int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
+ int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
+ int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f));
+ int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f));
+ int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f));
+ int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f));
+
+#define dct_long_mul(out, inq, coeff) \
+ int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
+ int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
+
+#define dct_long_mac(out, acc, inq, coeff) \
+ int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
+ int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
+
+#define dct_widen(out, inq) \
+ int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
+ int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
+
+// wide add
+#define dct_wadd(out, a, b) \
+ int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
+ int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
+
+// wide sub
+#define dct_wsub(out, a, b) \
+ int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
+ int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
+
+// butterfly a/b, then shift using "shiftop" by "s" and pack
+#define dct_bfly32o(out0,out1, a,b,shiftop,s) \
+ { \
+ dct_wadd(sum, a, b); \
+ dct_wsub(dif, a, b); \
+ out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
+ out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
+ }
+
+#define dct_pass(shiftop, shift) \
+ { \
+ /* even part */ \
+ int16x8_t sum26 = vaddq_s16(row2, row6); \
+ dct_long_mul(p1e, sum26, rot0_0); \
+ dct_long_mac(t2e, p1e, row6, rot0_1); \
+ dct_long_mac(t3e, p1e, row2, rot0_2); \
+ int16x8_t sum04 = vaddq_s16(row0, row4); \
+ int16x8_t dif04 = vsubq_s16(row0, row4); \
+ dct_widen(t0e, sum04); \
+ dct_widen(t1e, dif04); \
+ dct_wadd(x0, t0e, t3e); \
+ dct_wsub(x3, t0e, t3e); \
+ dct_wadd(x1, t1e, t2e); \
+ dct_wsub(x2, t1e, t2e); \
+ /* odd part */ \
+ int16x8_t sum15 = vaddq_s16(row1, row5); \
+ int16x8_t sum17 = vaddq_s16(row1, row7); \
+ int16x8_t sum35 = vaddq_s16(row3, row5); \
+ int16x8_t sum37 = vaddq_s16(row3, row7); \
+ int16x8_t sumodd = vaddq_s16(sum17, sum35); \
+ dct_long_mul(p5o, sumodd, rot1_0); \
+ dct_long_mac(p1o, p5o, sum17, rot1_1); \
+ dct_long_mac(p2o, p5o, sum35, rot1_2); \
+ dct_long_mul(p3o, sum37, rot2_0); \
+ dct_long_mul(p4o, sum15, rot2_1); \
+ dct_wadd(sump13o, p1o, p3o); \
+ dct_wadd(sump24o, p2o, p4o); \
+ dct_wadd(sump23o, p2o, p3o); \
+ dct_wadd(sump14o, p1o, p4o); \
+ dct_long_mac(x4, sump13o, row7, rot3_0); \
+ dct_long_mac(x5, sump24o, row5, rot3_1); \
+ dct_long_mac(x6, sump23o, row3, rot3_2); \
+ dct_long_mac(x7, sump14o, row1, rot3_3); \
+ dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \
+ dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \
+ dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \
+ dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \
+ }
+
+ // load
+ row0 = vld1q_s16(data + 0*8);
+ row1 = vld1q_s16(data + 1*8);
+ row2 = vld1q_s16(data + 2*8);
+ row3 = vld1q_s16(data + 3*8);
+ row4 = vld1q_s16(data + 4*8);
+ row5 = vld1q_s16(data + 5*8);
+ row6 = vld1q_s16(data + 6*8);
+ row7 = vld1q_s16(data + 7*8);
+
+ // add DC bias
+ row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
+
+ // column pass
+ dct_pass(vrshrn_n_s32, 10);
+
+ // 16bit 8x8 transpose
+ {
+// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
+// whether compilers actually get this is another story, sadly.
+#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); }
+#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); }
+
+ // pass 1
+ dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
+ dct_trn16(row2, row3);
+ dct_trn16(row4, row5);
+ dct_trn16(row6, row7);
+
+ // pass 2
+ dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
+ dct_trn32(row1, row3);
+ dct_trn32(row4, row6);
+ dct_trn32(row5, row7);
+
+ // pass 3
+ dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
+ dct_trn64(row1, row5);
+ dct_trn64(row2, row6);
+ dct_trn64(row3, row7);
+
+#undef dct_trn16
+#undef dct_trn32
+#undef dct_trn64
+ }
+
+ // row pass
+ // vrshrn_n_s32 only supports shifts up to 16, we need
+ // 17. so do a non-rounding shift of 16 first then follow
+ // up with a rounding shift by 1.
+ dct_pass(vshrn_n_s32, 16);
+
+ {
+ // pack and round
+ uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
+ uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
+ uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
+ uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
+ uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
+ uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
+ uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
+ uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
+
+ // again, these can translate into one instruction, but often don't.
+#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); }
+#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); }
+
+ // sadly can't use interleaved stores here since we only write
+ // 8 bytes to each scan line!
+
+ // 8x8 8-bit transpose pass 1
+ dct_trn8_8(p0, p1);
+ dct_trn8_8(p2, p3);
+ dct_trn8_8(p4, p5);
+ dct_trn8_8(p6, p7);
+
+ // pass 2
+ dct_trn8_16(p0, p2);
+ dct_trn8_16(p1, p3);
+ dct_trn8_16(p4, p6);
+ dct_trn8_16(p5, p7);
+
+ // pass 3
+ dct_trn8_32(p0, p4);
+ dct_trn8_32(p1, p5);
+ dct_trn8_32(p2, p6);
+ dct_trn8_32(p3, p7);
+
+ // store
+ vst1_u8(out, p0); out += out_stride;
+ vst1_u8(out, p1); out += out_stride;
+ vst1_u8(out, p2); out += out_stride;
+ vst1_u8(out, p3); out += out_stride;
+ vst1_u8(out, p4); out += out_stride;
+ vst1_u8(out, p5); out += out_stride;
+ vst1_u8(out, p6); out += out_stride;
+ vst1_u8(out, p7);
+
+#undef dct_trn8_8
+#undef dct_trn8_16
+#undef dct_trn8_32
+ }
+
+#undef dct_long_mul
+#undef dct_long_mac
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_pass
+}
+
+#endif // STBI_NEON
+
+#define STBI__MARKER_none 0xff
+// if there's a pending marker from the entropy stream, return that
+// otherwise, fetch from the stream and get a marker. if there's no
+// marker, return 0xff, which is never a valid marker value
+static stbi_uc stbi__get_marker(stbi__jpeg *j)
+{
+ stbi_uc x;
+ if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; }
+ x = stbi__get8(j->s);
+ if (x != 0xff) return STBI__MARKER_none;
+ while (x == 0xff)
+ x = stbi__get8(j->s);
+ return x;
+}
+
+// in each scan, we'll have scan_n components, and the order
+// of the components is specified by order[]
+#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
+
+// after a restart interval, stbi__jpeg_reset the entropy decoder and
+// the dc prediction
+static void stbi__jpeg_reset(stbi__jpeg *j)
+{
+ j->code_bits = 0;
+ j->code_buffer = 0;
+ j->nomore = 0;
+ j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0;
+ j->marker = STBI__MARKER_none;
+ j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
+ j->eob_run = 0;
+ // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
+ // since we don't even allow 1<<30 pixels
+}
+
+static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
+{
+ stbi__jpeg_reset(z);
+ if (!z->progressive) {
+ if (z->scan_n == 1) {
+ int i,j;
+ STBI_SIMD_ALIGN(short, data[64]);
+ int n = z->order[0];
+ // non-interleaved data, we just need to process one block at a time,
+ // in trivial scanline order
+ // number of blocks to do just depends on how many actual "pixels" this
+ // component has, independent of interleaved MCU blocking and such
+ int w = (z->img_comp[n].x+7) >> 3;
+ int h = (z->img_comp[n].y+7) >> 3;
+ for (j=0; j < h; ++j) {
+ for (i=0; i < w; ++i) {
+ int ha = z->img_comp[n].ha;
+ if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+ z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+ // every data block is an MCU, so countdown the restart interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+ // if it's NOT a restart, then just bail, so we get corrupt data
+ // rather than no data
+ if (!STBI__RESTART(z->marker)) return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
+ }
+ return 1;
+ } else { // interleaved
+ int i,j,k,x,y;
+ STBI_SIMD_ALIGN(short, data[64]);
+ for (j=0; j < z->img_mcu_y; ++j) {
+ for (i=0; i < z->img_mcu_x; ++i) {
+ // scan an interleaved mcu... process scan_n components in order
+ for (k=0; k < z->scan_n; ++k) {
+ int n = z->order[k];
+ // scan out an mcu's worth of this component; that's just determined
+ // by the basic H and V specified for the component
+ for (y=0; y < z->img_comp[n].v; ++y) {
+ for (x=0; x < z->img_comp[n].h; ++x) {
+ int x2 = (i*z->img_comp[n].h + x)*8;
+ int y2 = (j*z->img_comp[n].v + y)*8;
+ int ha = z->img_comp[n].ha;
+ if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+ z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data);
+ }
+ }
+ }
+ // after all interleaved components, that's an interleaved MCU,
+ // so now count down the restart interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+ if (!STBI__RESTART(z->marker)) return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
+ }
+ return 1;
+ }
+ } else {
+ if (z->scan_n == 1) {
+ int i,j;
+ int n = z->order[0];
+ // non-interleaved data, we just need to process one block at a time,
+ // in trivial scanline order
+ // number of blocks to do just depends on how many actual "pixels" this
+ // component has, independent of interleaved MCU blocking and such
+ int w = (z->img_comp[n].x+7) >> 3;
+ int h = (z->img_comp[n].y+7) >> 3;
+ for (j=0; j < h; ++j) {
+ for (i=0; i < w; ++i) {
+ short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+ if (z->spec_start == 0) {
+ if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+ return 0;
+ } else {
+ int ha = z->img_comp[n].ha;
+ if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha]))
+ return 0;
+ }
+ // every data block is an MCU, so countdown the restart interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+ if (!STBI__RESTART(z->marker)) return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
+ }
+ return 1;
+ } else { // interleaved
+ int i,j,k,x,y;
+ for (j=0; j < z->img_mcu_y; ++j) {
+ for (i=0; i < z->img_mcu_x; ++i) {
+ // scan an interleaved mcu... process scan_n components in order
+ for (k=0; k < z->scan_n; ++k) {
+ int n = z->order[k];
+ // scan out an mcu's worth of this component; that's just determined
+ // by the basic H and V specified for the component
+ for (y=0; y < z->img_comp[n].v; ++y) {
+ for (x=0; x < z->img_comp[n].h; ++x) {
+ int x2 = (i*z->img_comp[n].h + x);
+ int y2 = (j*z->img_comp[n].v + y);
+ short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
+ if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+ return 0;
+ }
+ }
+ }
+ // after all interleaved components, that's an interleaved MCU,
+ // so now count down the restart interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+ if (!STBI__RESTART(z->marker)) return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
+ }
+ return 1;
+ }
+ }
+}
+
+static void stbi__jpeg_dequantize(short *data, stbi_uc *dequant)
+{
+ int i;
+ for (i=0; i < 64; ++i)
+ data[i] *= dequant[i];
+}
+
+static void stbi__jpeg_finish(stbi__jpeg *z)
+{
+ if (z->progressive) {
+ // dequantize and idct the data
+ int i,j,n;
+ for (n=0; n < z->s->img_n; ++n) {
+ int w = (z->img_comp[n].x+7) >> 3;
+ int h = (z->img_comp[n].y+7) >> 3;
+ for (j=0; j < h; ++j) {
+ for (i=0; i < w; ++i) {
+ short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+ stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
+ z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+ }
+ }
+ }
+ }
+}
+
+static int stbi__process_marker(stbi__jpeg *z, int m)
+{
+ int L;
+ switch (m) {
+ case STBI__MARKER_none: // no marker found
+ return stbi__err("expected marker","Corrupt JPEG");
+
+ case 0xDD: // DRI - specify restart interval
+ if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG");
+ z->restart_interval = stbi__get16be(z->s);
+ return 1;
+
+ case 0xDB: // DQT - define quantization table
+ L = stbi__get16be(z->s)-2;
+ while (L > 0) {
+ int q = stbi__get8(z->s);
+ int p = q >> 4;
+ int t = q & 15,i;
+ if (p != 0) return stbi__err("bad DQT type","Corrupt JPEG");
+ if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG");
+ for (i=0; i < 64; ++i)
+ z->dequant[t][stbi__jpeg_dezigzag[i]] = stbi__get8(z->s);
+ L -= 65;
+ }
+ return L==0;
+
+ case 0xC4: // DHT - define huffman table
+ L = stbi__get16be(z->s)-2;
+ while (L > 0) {
+ stbi_uc *v;
+ int sizes[16],i,n=0;
+ int q = stbi__get8(z->s);
+ int tc = q >> 4;
+ int th = q & 15;
+ if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG");
+ for (i=0; i < 16; ++i) {
+ sizes[i] = stbi__get8(z->s);
+ n += sizes[i];
+ }
+ L -= 17;
+ if (tc == 0) {
+ if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
+ v = z->huff_dc[th].values;
+ } else {
+ if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0;
+ v = z->huff_ac[th].values;
+ }
+ for (i=0; i < n; ++i)
+ v[i] = stbi__get8(z->s);
+ if (tc != 0)
+ stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
+ L -= n;
+ }
+ return L==0;
+ }
+ // check for comment block or APP blocks
+ if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
+ stbi__skip(z->s, stbi__get16be(z->s)-2);
+ return 1;
+ }
+ return 0;
+}
+
+// after we see SOS
+static int stbi__process_scan_header(stbi__jpeg *z)
+{
+ int i;
+ int Ls = stbi__get16be(z->s);
+ z->scan_n = stbi__get8(z->s);
+ if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG");
+ if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG");
+ for (i=0; i < z->scan_n; ++i) {
+ int id = stbi__get8(z->s), which;
+ int q = stbi__get8(z->s);
+ for (which = 0; which < z->s->img_n; ++which)
+ if (z->img_comp[which].id == id)
+ break;
+ if (which == z->s->img_n) return 0; // no match
+ z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG");
+ z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG");
+ z->order[i] = which;
+ }
+
+ {
+ int aa;
+ z->spec_start = stbi__get8(z->s);
+ z->spec_end = stbi__get8(z->s); // should be 63, but might be 0
+ aa = stbi__get8(z->s);
+ z->succ_high = (aa >> 4);
+ z->succ_low = (aa & 15);
+ if (z->progressive) {
+ if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13)
+ return stbi__err("bad SOS", "Corrupt JPEG");
+ } else {
+ if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG");
+ if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG");
+ z->spec_end = 63;
+ }
+ }
+
+ return 1;
+}
+
+static int stbi__process_frame_header(stbi__jpeg *z, int scan)
+{
+ stbi__context *s = z->s;
+ int Lf,p,i,q, h_max=1,v_max=1,c;
+ Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG
+ p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
+ s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
+ s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires
+ c = stbi__get8(s);
+ if (c != 3 && c != 1) return stbi__err("bad component count","Corrupt JPEG"); // JFIF requires
+ s->img_n = c;
+ for (i=0; i < c; ++i) {
+ z->img_comp[i].data = NULL;
+ z->img_comp[i].linebuf = NULL;
+ }
+
+ if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG");
+
+ for (i=0; i < s->img_n; ++i) {
+ z->img_comp[i].id = stbi__get8(s);
+ if (z->img_comp[i].id != i+1) // JFIF requires
+ if (z->img_comp[i].id != i) // some version of jpegtran outputs non-JFIF-compliant files!
+ return stbi__err("bad component ID","Corrupt JPEG");
+ q = stbi__get8(s);
+ z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG");
+ z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG");
+ z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG");
+ }
+
+ if (scan != STBI__SCAN_load) return 1;
+
+ if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
+
+ for (i=0; i < s->img_n; ++i) {
+ if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
+ if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
+ }
+
+ // compute interleaved mcu info
+ z->img_h_max = h_max;
+ z->img_v_max = v_max;
+ z->img_mcu_w = h_max * 8;
+ z->img_mcu_h = v_max * 8;
+ z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
+ z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;
+
+ for (i=0; i < s->img_n; ++i) {
+ // number of effective pixels (e.g. for non-interleaved MCU)
+ z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
+ z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
+ // to simplify generation, we'll allocate enough memory to decode
+ // the bogus oversized data from using interleaved MCUs and their
+ // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
+ // discard the extra data until colorspace conversion
+ z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
+ z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
+ z->img_comp[i].raw_data = stbi__malloc(z->img_comp[i].w2 * z->img_comp[i].h2+15);
+
+ if (z->img_comp[i].raw_data == NULL) {
+ for(--i; i >= 0; --i) {
+ STBI_FREE(z->img_comp[i].raw_data);
+ z->img_comp[i].raw_data = NULL;
+ }
+ return stbi__err("outofmem", "Out of memory");
+ }
+ // align blocks for idct using mmx/sse
+ z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
+ z->img_comp[i].linebuf = NULL;
+ if (z->progressive) {
+ z->img_comp[i].coeff_w = (z->img_comp[i].w2 + 7) >> 3;
+ z->img_comp[i].coeff_h = (z->img_comp[i].h2 + 7) >> 3;
+ z->img_comp[i].raw_coeff = STBI_MALLOC(z->img_comp[i].coeff_w * z->img_comp[i].coeff_h * 64 * sizeof(short) + 15);
+ z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15);
+ } else {
+ z->img_comp[i].coeff = 0;
+ z->img_comp[i].raw_coeff = 0;
+ }
+ }
+
+ return 1;
+}
+
+// use comparisons since in some cases we handle more than one case (e.g. SOF)
+#define stbi__DNL(x) ((x) == 0xdc)
+#define stbi__SOI(x) ((x) == 0xd8)
+#define stbi__EOI(x) ((x) == 0xd9)
+#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
+#define stbi__SOS(x) ((x) == 0xda)
+
+#define stbi__SOF_progressive(x) ((x) == 0xc2)
+
+static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
+{
+ int m;
+ z->marker = STBI__MARKER_none; // initialize cached marker to empty
+ m = stbi__get_marker(z);
+ if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG");
+ if (scan == STBI__SCAN_type) return 1;
+ m = stbi__get_marker(z);
+ while (!stbi__SOF(m)) {
+ if (!stbi__process_marker(z,m)) return 0;
+ m = stbi__get_marker(z);
+ while (m == STBI__MARKER_none) {
+ // some files have extra padding after their blocks, so ok, we'll scan
+ if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG");
+ m = stbi__get_marker(z);
+ }
+ }
+ z->progressive = stbi__SOF_progressive(m);
+ if (!stbi__process_frame_header(z, scan)) return 0;
+ return 1;
+}
+
+// decode image to YCbCr format
+static int stbi__decode_jpeg_image(stbi__jpeg *j)
+{
+ int m;
+ for (m = 0; m < 4; m++) {
+ j->img_comp[m].raw_data = NULL;
+ j->img_comp[m].raw_coeff = NULL;
+ }
+ j->restart_interval = 0;
+ if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
+ m = stbi__get_marker(j);
+ while (!stbi__EOI(m)) {
+ if (stbi__SOS(m)) {
+ if (!stbi__process_scan_header(j)) return 0;
+ if (!stbi__parse_entropy_coded_data(j)) return 0;
+ if (j->marker == STBI__MARKER_none ) {
+ // handle 0s at the end of image data from IP Kamera 9060
+ while (!stbi__at_eof(j->s)) {
+ int x = stbi__get8(j->s);
+ if (x == 255) {
+ j->marker = stbi__get8(j->s);
+ break;
+ } else if (x != 0) {
+ return stbi__err("junk before marker", "Corrupt JPEG");
+ }
+ }
+ // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
+ }
+ } else {
+ if (!stbi__process_marker(j, m)) return 0;
+ }
+ m = stbi__get_marker(j);
+ }
+ if (j->progressive)
+ stbi__jpeg_finish(j);
+ return 1;
+}
+
+// static jfif-centered resampling (across block boundaries)
+
+typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1,
+ int w, int hs);
+
+#define stbi__div4(x) ((stbi_uc) ((x) >> 2))
+
+static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+ STBI_NOTUSED(out);
+ STBI_NOTUSED(in_far);
+ STBI_NOTUSED(w);
+ STBI_NOTUSED(hs);
+ return in_near;
+}
+
+static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+ // need to generate two samples vertically for every one in input
+ int i;
+ STBI_NOTUSED(hs);
+ for (i=0; i < w; ++i)
+ out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2);
+ return out;
+}
+
+static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+ // need to generate two samples horizontally for every one in input
+ int i;
+ stbi_uc *input = in_near;
+
+ if (w == 1) {
+ // if only one sample, can't do any interpolation
+ out[0] = out[1] = input[0];
+ return out;
+ }
+
+ out[0] = input[0];
+ out[1] = stbi__div4(input[0]*3 + input[1] + 2);
+ for (i=1; i < w-1; ++i) {
+ int n = 3*input[i]+2;
+ out[i*2+0] = stbi__div4(n+input[i-1]);
+ out[i*2+1] = stbi__div4(n+input[i+1]);
+ }
+ out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2);
+ out[i*2+1] = input[w-1];
+
+ STBI_NOTUSED(in_far);
+ STBI_NOTUSED(hs);
+
+ return out;
+}
+
+#define stbi__div16(x) ((stbi_uc) ((x) >> 4))
+
+static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+ // need to generate 2x2 samples for every one in input
+ int i,t0,t1;
+ if (w == 1) {
+ out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+ return out;
+ }
+
+ t1 = 3*in_near[0] + in_far[0];
+ out[0] = stbi__div4(t1+2);
+ for (i=1; i < w; ++i) {
+ t0 = t1;
+ t1 = 3*in_near[i]+in_far[i];
+ out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+ out[i*2 ] = stbi__div16(3*t1 + t0 + 8);
+ }
+ out[w*2-1] = stbi__div4(t1+2);
+
+ STBI_NOTUSED(hs);
+
+ return out;
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+ // need to generate 2x2 samples for every one in input
+ int i=0,t0,t1;
+
+ if (w == 1) {
+ out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+ return out;
+ }
+
+ t1 = 3*in_near[0] + in_far[0];
+ // process groups of 8 pixels for as long as we can.
+ // note we can't handle the last pixel in a row in this loop
+ // because we need to handle the filter boundary conditions.
+ for (; i < ((w-1) & ~7); i += 8) {
+#if defined(STBI_SSE2)
+ // load and perform the vertical filtering pass
+ // this uses 3*x + y = 4*x + (y - x)
+ __m128i zero = _mm_setzero_si128();
+ __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i));
+ __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i));
+ __m128i farw = _mm_unpacklo_epi8(farb, zero);
+ __m128i nearw = _mm_unpacklo_epi8(nearb, zero);
+ __m128i diff = _mm_sub_epi16(farw, nearw);
+ __m128i nears = _mm_slli_epi16(nearw, 2);
+ __m128i curr = _mm_add_epi16(nears, diff); // current row
+
+ // horizontal filter works the same based on shifted vers of current
+ // row. "prev" is current row shifted right by 1 pixel; we need to
+ // insert the previous pixel value (from t1).
+ // "next" is current row shifted left by 1 pixel, with first pixel
+ // of next block of 8 pixels added in.
+ __m128i prv0 = _mm_slli_si128(curr, 2);
+ __m128i nxt0 = _mm_srli_si128(curr, 2);
+ __m128i prev = _mm_insert_epi16(prv0, t1, 0);
+ __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7);
+
+ // horizontal filter, polyphase implementation since it's convenient:
+ // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+ // odd pixels = 3*cur + next = cur*4 + (next - cur)
+ // note the shared term.
+ __m128i bias = _mm_set1_epi16(8);
+ __m128i curs = _mm_slli_epi16(curr, 2);
+ __m128i prvd = _mm_sub_epi16(prev, curr);
+ __m128i nxtd = _mm_sub_epi16(next, curr);
+ __m128i curb = _mm_add_epi16(curs, bias);
+ __m128i even = _mm_add_epi16(prvd, curb);
+ __m128i odd = _mm_add_epi16(nxtd, curb);
+
+ // interleave even and odd pixels, then undo scaling.
+ __m128i int0 = _mm_unpacklo_epi16(even, odd);
+ __m128i int1 = _mm_unpackhi_epi16(even, odd);
+ __m128i de0 = _mm_srli_epi16(int0, 4);
+ __m128i de1 = _mm_srli_epi16(int1, 4);
+
+ // pack and write output
+ __m128i outv = _mm_packus_epi16(de0, de1);
+ _mm_storeu_si128((__m128i *) (out + i*2), outv);
+#elif defined(STBI_NEON)
+ // load and perform the vertical filtering pass
+ // this uses 3*x + y = 4*x + (y - x)
+ uint8x8_t farb = vld1_u8(in_far + i);
+ uint8x8_t nearb = vld1_u8(in_near + i);
+ int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
+ int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
+ int16x8_t curr = vaddq_s16(nears, diff); // current row
+
+ // horizontal filter works the same based on shifted vers of current
+ // row. "prev" is current row shifted right by 1 pixel; we need to
+ // insert the previous pixel value (from t1).
+ // "next" is current row shifted left by 1 pixel, with first pixel
+ // of next block of 8 pixels added in.
+ int16x8_t prv0 = vextq_s16(curr, curr, 7);
+ int16x8_t nxt0 = vextq_s16(curr, curr, 1);
+ int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
+ int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7);
+
+ // horizontal filter, polyphase implementation since it's convenient:
+ // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+ // odd pixels = 3*cur + next = cur*4 + (next - cur)
+ // note the shared term.
+ int16x8_t curs = vshlq_n_s16(curr, 2);
+ int16x8_t prvd = vsubq_s16(prev, curr);
+ int16x8_t nxtd = vsubq_s16(next, curr);
+ int16x8_t even = vaddq_s16(curs, prvd);
+ int16x8_t odd = vaddq_s16(curs, nxtd);
+
+ // undo scaling and round, then store with even/odd phases interleaved
+ uint8x8x2_t o;
+ o.val[0] = vqrshrun_n_s16(even, 4);
+ o.val[1] = vqrshrun_n_s16(odd, 4);
+ vst2_u8(out + i*2, o);
+#endif
+
+ // "previous" value for next iter
+ t1 = 3*in_near[i+7] + in_far[i+7];
+ }
+
+ t0 = t1;
+ t1 = 3*in_near[i] + in_far[i];
+ out[i*2] = stbi__div16(3*t1 + t0 + 8);
+
+ for (++i; i < w; ++i) {
+ t0 = t1;
+ t1 = 3*in_near[i]+in_far[i];
+ out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+ out[i*2 ] = stbi__div16(3*t1 + t0 + 8);
+ }
+ out[w*2-1] = stbi__div4(t1+2);
+
+ STBI_NOTUSED(hs);
+
+ return out;
+}
+#endif
+
+static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+ // resample with nearest-neighbor
+ int i,j;
+ STBI_NOTUSED(in_far);
+ for (i=0; i < w; ++i)
+ for (j=0; j < hs; ++j)
+ out[i*hs+j] = in_near[i];
+ return out;
+}
+
+#ifdef STBI_JPEG_OLD
+// this is the same YCbCr-to-RGB calculation that stb_image has used
+// historically before the algorithm changes in 1.49
+#define float2fixed(x) ((int) ((x) * 65536 + 0.5))
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
+{
+ int i;
+ for (i=0; i < count; ++i) {
+ int y_fixed = (y[i] << 16) + 32768; // rounding
+ int r,g,b;
+ int cr = pcr[i] - 128;
+ int cb = pcb[i] - 128;
+ r = y_fixed + cr*float2fixed(1.40200f);
+ g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f);
+ b = y_fixed + cb*float2fixed(1.77200f);
+ r >>= 16;
+ g >>= 16;
+ b >>= 16;
+ if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+ if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+ if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+ out[0] = (stbi_uc)r;
+ out[1] = (stbi_uc)g;
+ out[2] = (stbi_uc)b;
+ out[3] = 255;
+ out += step;
+ }
+}
+#else
+// this is a reduced-precision calculation of YCbCr-to-RGB introduced
+// to make sure the code produces the same results in both SIMD and scalar
+#define float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8)
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
+{
+ int i;
+ for (i=0; i < count; ++i) {
+ int y_fixed = (y[i] << 20) + (1<<19); // rounding
+ int r,g,b;
+ int cr = pcr[i] - 128;
+ int cb = pcb[i] - 128;
+ r = y_fixed + cr* float2fixed(1.40200f);
+ g = y_fixed + (cr*-float2fixed(0.71414f)) + ((cb*-float2fixed(0.34414f)) & 0xffff0000);
+ b = y_fixed + cb* float2fixed(1.77200f);
+ r >>= 20;
+ g >>= 20;
+ b >>= 20;
+ if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+ if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+ if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+ out[0] = (stbi_uc)r;
+ out[1] = (stbi_uc)g;
+ out[2] = (stbi_uc)b;
+ out[3] = 255;
+ out += step;
+ }
+}
+#endif
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step)
+{
+ int i = 0;
+
+#ifdef STBI_SSE2
+ // step == 3 is pretty ugly on the final interleave, and i'm not convinced
+ // it's useful in practice (you wouldn't use it for textures, for example).
+ // so just accelerate step == 4 case.
+ if (step == 4) {
+ // this is a fairly straightforward implementation and not super-optimized.
+ __m128i signflip = _mm_set1_epi8(-0x80);
+ __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f));
+ __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f));
+ __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f));
+ __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f));
+ __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128);
+ __m128i xw = _mm_set1_epi16(255); // alpha channel
+
+ for (; i+7 < count; i += 8) {
+ // load
+ __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i));
+ __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i));
+ __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i));
+ __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
+ __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
+
+ // unpack to short (and left-shift cr, cb by 8)
+ __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes);
+ __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
+ __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
+
+ // color transform
+ __m128i yws = _mm_srli_epi16(yw, 4);
+ __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
+ __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
+ __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
+ __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
+ __m128i rws = _mm_add_epi16(cr0, yws);
+ __m128i gwt = _mm_add_epi16(cb0, yws);
+ __m128i bws = _mm_add_epi16(yws, cb1);
+ __m128i gws = _mm_add_epi16(gwt, cr1);
+
+ // descale
+ __m128i rw = _mm_srai_epi16(rws, 4);
+ __m128i bw = _mm_srai_epi16(bws, 4);
+ __m128i gw = _mm_srai_epi16(gws, 4);
+
+ // back to byte, set up for transpose
+ __m128i brb = _mm_packus_epi16(rw, bw);
+ __m128i gxb = _mm_packus_epi16(gw, xw);
+
+ // transpose to interleave channels
+ __m128i t0 = _mm_unpacklo_epi8(brb, gxb);
+ __m128i t1 = _mm_unpackhi_epi8(brb, gxb);
+ __m128i o0 = _mm_unpacklo_epi16(t0, t1);
+ __m128i o1 = _mm_unpackhi_epi16(t0, t1);
+
+ // store
+ _mm_storeu_si128((__m128i *) (out + 0), o0);
+ _mm_storeu_si128((__m128i *) (out + 16), o1);
+ out += 32;
+ }
+ }
+#endif
+
+#ifdef STBI_NEON
+ // in this version, step=3 support would be easy to add. but is there demand?
+ if (step == 4) {
+ // this is a fairly straightforward implementation and not super-optimized.
+ uint8x8_t signflip = vdup_n_u8(0x80);
+ int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f));
+ int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f));
+ int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f));
+ int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f));
+
+ for (; i+7 < count; i += 8) {
+ // load
+ uint8x8_t y_bytes = vld1_u8(y + i);
+ uint8x8_t cr_bytes = vld1_u8(pcr + i);
+ uint8x8_t cb_bytes = vld1_u8(pcb + i);
+ int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
+ int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
+
+ // expand to s16
+ int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
+ int16x8_t crw = vshll_n_s8(cr_biased, 7);
+ int16x8_t cbw = vshll_n_s8(cb_biased, 7);
+
+ // color transform
+ int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
+ int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
+ int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
+ int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
+ int16x8_t rws = vaddq_s16(yws, cr0);
+ int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
+ int16x8_t bws = vaddq_s16(yws, cb1);
+
+ // undo scaling, round, convert to byte
+ uint8x8x4_t o;
+ o.val[0] = vqrshrun_n_s16(rws, 4);
+ o.val[1] = vqrshrun_n_s16(gws, 4);
+ o.val[2] = vqrshrun_n_s16(bws, 4);
+ o.val[3] = vdup_n_u8(255);
+
+ // store, interleaving r/g/b/a
+ vst4_u8(out, o);
+ out += 8*4;
+ }
+ }
+#endif
+
+ for (; i < count; ++i) {
+ int y_fixed = (y[i] << 20) + (1<<19); // rounding
+ int r,g,b;
+ int cr = pcr[i] - 128;
+ int cb = pcb[i] - 128;
+ r = y_fixed + cr* float2fixed(1.40200f);
+ g = y_fixed + cr*-float2fixed(0.71414f) + ((cb*-float2fixed(0.34414f)) & 0xffff0000);
+ b = y_fixed + cb* float2fixed(1.77200f);
+ r >>= 20;
+ g >>= 20;
+ b >>= 20;
+ if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+ if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+ if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+ out[0] = (stbi_uc)r;
+ out[1] = (stbi_uc)g;
+ out[2] = (stbi_uc)b;
+ out[3] = 255;
+ out += step;
+ }
+}
+#endif
+
+// set up the kernels
+static void stbi__setup_jpeg(stbi__jpeg *j)
+{
+ j->idct_block_kernel = stbi__idct_block;
+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
+
+#ifdef STBI_SSE2
+ if (stbi__sse2_available()) {
+ j->idct_block_kernel = stbi__idct_simd;
+ #ifndef STBI_JPEG_OLD
+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+ #endif
+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+ }
+#endif
+
+#ifdef STBI_NEON
+ j->idct_block_kernel = stbi__idct_simd;
+ #ifndef STBI_JPEG_OLD
+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+ #endif
+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+#endif
+}
+
+// clean up the temporary component buffers
+static void stbi__cleanup_jpeg(stbi__jpeg *j)
+{
+ int i;
+ for (i=0; i < j->s->img_n; ++i) {
+ if (j->img_comp[i].raw_data) {
+ STBI_FREE(j->img_comp[i].raw_data);
+ j->img_comp[i].raw_data = NULL;
+ j->img_comp[i].data = NULL;
+ }
+ if (j->img_comp[i].raw_coeff) {
+ STBI_FREE(j->img_comp[i].raw_coeff);
+ j->img_comp[i].raw_coeff = 0;
+ j->img_comp[i].coeff = 0;
+ }
+ if (j->img_comp[i].linebuf) {
+ STBI_FREE(j->img_comp[i].linebuf);
+ j->img_comp[i].linebuf = NULL;
+ }
+ }
+}
+
+typedef struct
+{
+ resample_row_func resample;
+ stbi_uc *line0,*line1;
+ int hs,vs; // expansion factor in each axis
+ int w_lores; // horizontal pixels pre-expansion
+ int ystep; // how far through vertical expansion we are
+ int ypos; // which pre-expansion row we're on
+} stbi__resample;
+
+static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
+{
+ int n, decode_n;
+ z->s->img_n = 0; // make stbi__cleanup_jpeg safe
+
+ // validate req_comp
+ if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+
+ // load a jpeg image from whichever source, but leave in YCbCr format
+ if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; }
+
+ // determine actual number of components to generate
+ n = req_comp ? req_comp : z->s->img_n;
+
+ if (z->s->img_n == 3 && n < 3)
+ decode_n = 1;
+ else
+ decode_n = z->s->img_n;
+
+ // resample and color-convert
+ {
+ int k;
+ unsigned int i,j;
+ stbi_uc *output;
+ stbi_uc *coutput[4];
+
+ stbi__resample res_comp[4];
+
+ for (k=0; k < decode_n; ++k) {
+ stbi__resample *r = &res_comp[k];
+
+ // allocate line buffer big enough for upsampling off the edges
+ // with upsample factor of 4
+ z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3);
+ if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+
+ r->hs = z->img_h_max / z->img_comp[k].h;
+ r->vs = z->img_v_max / z->img_comp[k].v;
+ r->ystep = r->vs >> 1;
+ r->w_lores = (z->s->img_x + r->hs-1) / r->hs;
+ r->ypos = 0;
+ r->line0 = r->line1 = z->img_comp[k].data;
+
+ if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
+ else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2;
+ else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2;
+ else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel;
+ else r->resample = stbi__resample_row_generic;
+ }
+
+ // can't error after this so, this is safe
+ output = (stbi_uc *) stbi__malloc(n * z->s->img_x * z->s->img_y + 1);
+ if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+
+ // now go ahead and resample
+ for (j=0; j < z->s->img_y; ++j) {
+ stbi_uc *out = output + n * z->s->img_x * j;
+ for (k=0; k < decode_n; ++k) {
+ stbi__resample *r = &res_comp[k];
+ int y_bot = r->ystep >= (r->vs >> 1);
+ coutput[k] = r->resample(z->img_comp[k].linebuf,
+ y_bot ? r->line1 : r->line0,
+ y_bot ? r->line0 : r->line1,
+ r->w_lores, r->hs);
+ if (++r->ystep >= r->vs) {
+ r->ystep = 0;
+ r->line0 = r->line1;
+ if (++r->ypos < z->img_comp[k].y)
+ r->line1 += z->img_comp[k].w2;
+ }
+ }
+ if (n >= 3) {
+ stbi_uc *y = coutput[0];
+ if (z->s->img_n == 3) {
+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+ } else
+ for (i=0; i < z->s->img_x; ++i) {
+ out[0] = out[1] = out[2] = y[i];
+ out[3] = 255; // not used if n==3
+ out += n;
+ }
+ } else {
+ stbi_uc *y = coutput[0];
+ if (n == 1)
+ for (i=0; i < z->s->img_x; ++i) out[i] = y[i];
+ else
+ for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255;
+ }
+ }
+ stbi__cleanup_jpeg(z);
+ *out_x = z->s->img_x;
+ *out_y = z->s->img_y;
+ if (comp) *comp = z->s->img_n; // report original components, not output
+ return output;
+ }
+}
+
+static unsigned char *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ stbi__jpeg j;
+ j.s = s;
+ stbi__setup_jpeg(&j);
+ return load_jpeg_image(&j, x,y,comp,req_comp);
+}
+
+static int stbi__jpeg_test(stbi__context *s)
+{
+ int r;
+ stbi__jpeg j;
+ j.s = s;
+ stbi__setup_jpeg(&j);
+ r = stbi__decode_jpeg_header(&j, STBI__SCAN_type);
+ stbi__rewind(s);
+ return r;
+}
+
+static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
+{
+ if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
+ stbi__rewind( j->s );
+ return 0;
+ }
+ if (x) *x = j->s->img_x;
+ if (y) *y = j->s->img_y;
+ if (comp) *comp = j->s->img_n;
+ return 1;
+}
+
+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
+{
+ stbi__jpeg j;
+ j.s = s;
+ return stbi__jpeg_info_raw(&j, x, y, comp);
+}
+#endif
+
+// public domain zlib decode v0.2 Sean Barrett 2006-11-18
+// simple implementation
+// - all input must be provided in an upfront buffer
+// - all output is written to a single output buffer (can malloc/realloc)
+// performance
+// - fast huffman
+
+#ifndef STBI_NO_ZLIB
+
+// fast-way is faster to check than jpeg huffman, but slow way is slower
+#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables
+#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1)
+
+// zlib-style huffman encoding
+// (jpegs packs from left, zlib from right, so can't share code)
+typedef struct
+{
+ stbi__uint16 fast[1 << STBI__ZFAST_BITS];
+ stbi__uint16 firstcode[16];
+ int maxcode[17];
+ stbi__uint16 firstsymbol[16];
+ stbi_uc size[288];
+ stbi__uint16 value[288];
+} stbi__zhuffman;
+
+stbi_inline static int stbi__bitreverse16(int n)
+{
+ n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1);
+ n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2);
+ n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4);
+ n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8);
+ return n;
+}
+
+stbi_inline static int stbi__bit_reverse(int v, int bits)
+{
+ STBI_ASSERT(bits <= 16);
+ // to bit reverse n bits, reverse 16 and shift
+ // e.g. 11 bits, bit reverse and shift away 5
+ return stbi__bitreverse16(v) >> (16-bits);
+}
+
+static int stbi__zbuild_huffman(stbi__zhuffman *z, stbi_uc *sizelist, int num)
+{
+ int i,k=0;
+ int code, next_code[16], sizes[17];
+
+ // DEFLATE spec for generating codes
+ memset(sizes, 0, sizeof(sizes));
+ memset(z->fast, 0, sizeof(z->fast));
+ for (i=0; i < num; ++i)
+ ++sizes[sizelist[i]];
+ sizes[0] = 0;
+ for (i=1; i < 16; ++i)
+ if (sizes[i] > (1 << i))
+ return stbi__err("bad sizes", "Corrupt PNG");
+ code = 0;
+ for (i=1; i < 16; ++i) {
+ next_code[i] = code;
+ z->firstcode[i] = (stbi__uint16) code;
+ z->firstsymbol[i] = (stbi__uint16) k;
+ code = (code + sizes[i]);
+ if (sizes[i])
+ if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG");
+ z->maxcode[i] = code << (16-i); // preshift for inner loop
+ code <<= 1;
+ k += sizes[i];
+ }
+ z->maxcode[16] = 0x10000; // sentinel
+ for (i=0; i < num; ++i) {
+ int s = sizelist[i];
+ if (s) {
+ int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
+ stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i);
+ z->size [c] = (stbi_uc ) s;
+ z->value[c] = (stbi__uint16) i;
+ if (s <= STBI__ZFAST_BITS) {
+ int j = stbi__bit_reverse(next_code[s],s);
+ while (j < (1 << STBI__ZFAST_BITS)) {
+ z->fast[j] = fastv;
+ j += (1 << s);
+ }
+ }
+ ++next_code[s];
+ }
+ }
+ return 1;
+}
+
+// zlib-from-memory implementation for PNG reading
+// because PNG allows splitting the zlib stream arbitrarily,
+// and it's annoying structurally to have PNG call ZLIB call PNG,
+// we require PNG read all the IDATs and combine them into a single
+// memory buffer
+
+typedef struct
+{
+ stbi_uc *zbuffer, *zbuffer_end;
+ int num_bits;
+ stbi__uint32 code_buffer;
+
+ char *zout;
+ char *zout_start;
+ char *zout_end;
+ int z_expandable;
+
+ stbi__zhuffman z_length, z_distance;
+} stbi__zbuf;
+
+stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z)
+{
+ if (z->zbuffer >= z->zbuffer_end) return 0;
+ return *z->zbuffer++;
+}
+
+static void stbi__fill_bits(stbi__zbuf *z)
+{
+ do {
+ STBI_ASSERT(z->code_buffer < (1U << z->num_bits));
+ z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits;
+ z->num_bits += 8;
+ } while (z->num_bits <= 24);
+}
+
+stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n)
+{
+ unsigned int k;
+ if (z->num_bits < n) stbi__fill_bits(z);
+ k = z->code_buffer & ((1 << n) - 1);
+ z->code_buffer >>= n;
+ z->num_bits -= n;
+ return k;
+}
+
+static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z)
+{
+ int b,s,k;
+ // not resolved by fast table, so compute it the slow way
+ // use jpeg approach, which requires MSbits at top
+ k = stbi__bit_reverse(a->code_buffer, 16);
+ for (s=STBI__ZFAST_BITS+1; ; ++s)
+ if (k < z->maxcode[s])
+ break;
+ if (s == 16) return -1; // invalid code!
+ // code size is s, so:
+ b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
+ STBI_ASSERT(z->size[b] == s);
+ a->code_buffer >>= s;
+ a->num_bits -= s;
+ return z->value[b];
+}
+
+stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z)
+{
+ int b,s;
+ if (a->num_bits < 16) stbi__fill_bits(a);
+ b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
+ if (b) {
+ s = b >> 9;
+ a->code_buffer >>= s;
+ a->num_bits -= s;
+ return b & 511;
+ }
+ return stbi__zhuffman_decode_slowpath(a, z);
+}
+
+static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes
+{
+ char *q;
+ int cur, limit, old_limit;
+ z->zout = zout;
+ if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG");
+ cur = (int) (z->zout - z->zout_start);
+ limit = old_limit = (int) (z->zout_end - z->zout_start);
+ while (cur + n > limit)
+ limit *= 2;
+ q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
+ STBI_NOTUSED(old_limit);
+ if (q == NULL) return stbi__err("outofmem", "Out of memory");
+ z->zout_start = q;
+ z->zout = q + cur;
+ z->zout_end = q + limit;
+ return 1;
+}
+
+static int stbi__zlength_base[31] = {
+ 3,4,5,6,7,8,9,10,11,13,
+ 15,17,19,23,27,31,35,43,51,59,
+ 67,83,99,115,131,163,195,227,258,0,0 };
+
+static int stbi__zlength_extra[31]=
+{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
+
+static int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
+257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
+
+static int stbi__zdist_extra[32] =
+{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+
+static int stbi__parse_huffman_block(stbi__zbuf *a)
+{
+ char *zout = a->zout;
+ for(;;) {
+ int z = stbi__zhuffman_decode(a, &a->z_length);
+ if (z < 256) {
+ if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes
+ if (zout >= a->zout_end) {
+ if (!stbi__zexpand(a, zout, 1)) return 0;
+ zout = a->zout;
+ }
+ *zout++ = (char) z;
+ } else {
+ stbi_uc *p;
+ int len,dist;
+ if (z == 256) {
+ a->zout = zout;
+ return 1;
+ }
+ z -= 257;
+ len = stbi__zlength_base[z];
+ if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
+ z = stbi__zhuffman_decode(a, &a->z_distance);
+ if (z < 0) return stbi__err("bad huffman code","Corrupt PNG");
+ dist = stbi__zdist_base[z];
+ if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
+ if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
+ if (zout + len > a->zout_end) {
+ if (!stbi__zexpand(a, zout, len)) return 0;
+ zout = a->zout;
+ }
+ p = (stbi_uc *) (zout - dist);
+ if (dist == 1) { // run of one byte; common in images.
+ stbi_uc v = *p;
+ if (len) { do *zout++ = v; while (--len); }
+ } else {
+ if (len) { do *zout++ = *p++; while (--len); }
+ }
+ }
+ }
+}
+
+static int stbi__compute_huffman_codes(stbi__zbuf *a)
+{
+ static stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
+ stbi__zhuffman z_codelength;
+ stbi_uc lencodes[286+32+137];//padding for maximum single op
+ stbi_uc codelength_sizes[19];
+ int i,n;
+
+ int hlit = stbi__zreceive(a,5) + 257;
+ int hdist = stbi__zreceive(a,5) + 1;
+ int hclen = stbi__zreceive(a,4) + 4;
+
+ memset(codelength_sizes, 0, sizeof(codelength_sizes));
+ for (i=0; i < hclen; ++i) {
+ int s = stbi__zreceive(a,3);
+ codelength_sizes[length_dezigzag[i]] = (stbi_uc) s;
+ }
+ if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
+
+ n = 0;
+ while (n < hlit + hdist) {
+ int c = stbi__zhuffman_decode(a, &z_codelength);
+ if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG");
+ if (c < 16)
+ lencodes[n++] = (stbi_uc) c;
+ else if (c == 16) {
+ c = stbi__zreceive(a,2)+3;
+ memset(lencodes+n, lencodes[n-1], c);
+ n += c;
+ } else if (c == 17) {
+ c = stbi__zreceive(a,3)+3;
+ memset(lencodes+n, 0, c);
+ n += c;
+ } else {
+ STBI_ASSERT(c == 18);
+ c = stbi__zreceive(a,7)+11;
+ memset(lencodes+n, 0, c);
+ n += c;
+ }
+ }
+ if (n != hlit+hdist) return stbi__err("bad codelengths","Corrupt PNG");
+ if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
+ if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
+ return 1;
+}
+
+static int stbi__parse_uncomperssed_block(stbi__zbuf *a)
+{
+ stbi_uc header[4];
+ int len,nlen,k;
+ if (a->num_bits & 7)
+ stbi__zreceive(a, a->num_bits & 7); // discard
+ // drain the bit-packed data into header
+ k = 0;
+ while (a->num_bits > 0) {
+ header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check
+ a->code_buffer >>= 8;
+ a->num_bits -= 8;
+ }
+ STBI_ASSERT(a->num_bits == 0);
+ // now fill header the normal way
+ while (k < 4)
+ header[k++] = stbi__zget8(a);
+ len = header[1] * 256 + header[0];
+ nlen = header[3] * 256 + header[2];
+ if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG");
+ if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG");
+ if (a->zout + len > a->zout_end)
+ if (!stbi__zexpand(a, a->zout, len)) return 0;
+ memcpy(a->zout, a->zbuffer, len);
+ a->zbuffer += len;
+ a->zout += len;
+ return 1;
+}
+
+static int stbi__parse_zlib_header(stbi__zbuf *a)
+{
+ int cmf = stbi__zget8(a);
+ int cm = cmf & 15;
+ /* int cinfo = cmf >> 4; */
+ int flg = stbi__zget8(a);
+ if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
+ if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
+ if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png
+ // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
+ return 1;
+}
+
+// @TODO: should statically initialize these for optimal thread safety
+static stbi_uc stbi__zdefault_length[288], stbi__zdefault_distance[32];
+static void stbi__init_zdefaults(void)
+{
+ int i; // use <= to match clearly with spec
+ for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8;
+ for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9;
+ for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7;
+ for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8;
+
+ for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5;
+}
+
+static int stbi__parse_zlib(stbi__zbuf *a, int parse_header)
+{
+ int final, type;
+ if (parse_header)
+ if (!stbi__parse_zlib_header(a)) return 0;
+ a->num_bits = 0;
+ a->code_buffer = 0;
+ do {
+ final = stbi__zreceive(a,1);
+ type = stbi__zreceive(a,2);
+ if (type == 0) {
+ if (!stbi__parse_uncomperssed_block(a)) return 0;
+ } else if (type == 3) {
+ return 0;
+ } else {
+ if (type == 1) {
+ // use fixed code lengths
+ if (!stbi__zdefault_distance[31]) stbi__init_zdefaults();
+ if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , 288)) return 0;
+ if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0;
+ } else {
+ if (!stbi__compute_huffman_codes(a)) return 0;
+ }
+ if (!stbi__parse_huffman_block(a)) return 0;
+ }
+ } while (!final);
+ return 1;
+}
+
+static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header)
+{
+ a->zout_start = obuf;
+ a->zout = obuf;
+ a->zout_end = obuf + olen;
+ a->z_expandable = exp;
+
+ return stbi__parse_zlib(a, parse_header);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
+{
+ stbi__zbuf a;
+ char *p = (char *) stbi__malloc(initial_size);
+ if (p == NULL) return NULL;
+ a.zbuffer = (stbi_uc *) buffer;
+ a.zbuffer_end = (stbi_uc *) buffer + len;
+ if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
+ if (outlen) *outlen = (int) (a.zout - a.zout_start);
+ return a.zout_start;
+ } else {
+ STBI_FREE(a.zout_start);
+ return NULL;
+ }
+}
+
+STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
+{
+ return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
+{
+ stbi__zbuf a;
+ char *p = (char *) stbi__malloc(initial_size);
+ if (p == NULL) return NULL;
+ a.zbuffer = (stbi_uc *) buffer;
+ a.zbuffer_end = (stbi_uc *) buffer + len;
+ if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
+ if (outlen) *outlen = (int) (a.zout - a.zout_start);
+ return a.zout_start;
+ } else {
+ STBI_FREE(a.zout_start);
+ return NULL;
+ }
+}
+
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
+{
+ stbi__zbuf a;
+ a.zbuffer = (stbi_uc *) ibuffer;
+ a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+ if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
+ return (int) (a.zout - a.zout_start);
+ else
+ return -1;
+}
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
+{
+ stbi__zbuf a;
+ char *p = (char *) stbi__malloc(16384);
+ if (p == NULL) return NULL;
+ a.zbuffer = (stbi_uc *) buffer;
+ a.zbuffer_end = (stbi_uc *) buffer+len;
+ if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
+ if (outlen) *outlen = (int) (a.zout - a.zout_start);
+ return a.zout_start;
+ } else {
+ STBI_FREE(a.zout_start);
+ return NULL;
+ }
+}
+
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
+{
+ stbi__zbuf a;
+ a.zbuffer = (stbi_uc *) ibuffer;
+ a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+ if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
+ return (int) (a.zout - a.zout_start);
+ else
+ return -1;
+}
+#endif
+
+// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18
+// simple implementation
+// - only 8-bit samples
+// - no CRC checking
+// - allocates lots of intermediate memory
+// - avoids problem of streaming data between subsystems
+// - avoids explicit window management
+// performance
+// - uses stb_zlib, a PD zlib implementation with fast huffman decoding
+
+#ifndef STBI_NO_PNG
+typedef struct
+{
+ stbi__uint32 length;
+ stbi__uint32 type;
+} stbi__pngchunk;
+
+static stbi__pngchunk stbi__get_chunk_header(stbi__context *s)
+{
+ stbi__pngchunk c;
+ c.length = stbi__get32be(s);
+ c.type = stbi__get32be(s);
+ return c;
+}
+
+static int stbi__check_png_header(stbi__context *s)
+{
+ static stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 };
+ int i;
+ for (i=0; i < 8; ++i)
+ if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG");
+ return 1;
+}
+
+typedef struct
+{
+ stbi__context *s;
+ stbi_uc *idata, *expanded, *out;
+} stbi__png;
+
+
+enum {
+ STBI__F_none=0,
+ STBI__F_sub=1,
+ STBI__F_up=2,
+ STBI__F_avg=3,
+ STBI__F_paeth=4,
+ // synthetic filters used for first scanline to avoid needing a dummy row of 0s
+ STBI__F_avg_first,
+ STBI__F_paeth_first
+};
+
+static stbi_uc first_row_filter[5] =
+{
+ STBI__F_none,
+ STBI__F_sub,
+ STBI__F_none,
+ STBI__F_avg_first,
+ STBI__F_paeth_first
+};
+
+static int stbi__paeth(int a, int b, int c)
+{
+ int p = a + b - c;
+ int pa = abs(p-a);
+ int pb = abs(p-b);
+ int pc = abs(p-c);
+ if (pa <= pb && pa <= pc) return a;
+ if (pb <= pc) return b;
+ return c;
+}
+
+static stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 };
+
+// create the png data from post-deflated data
+static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color)
+{
+ stbi__context *s = a->s;
+ stbi__uint32 i,j,stride = x*out_n;
+ stbi__uint32 img_len, img_width_bytes;
+ int k;
+ int img_n = s->img_n; // copy it into a local for later
+
+ STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1);
+ a->out = (stbi_uc *) stbi__malloc(x * y * out_n); // extra bytes to write off the end into
+ if (!a->out) return stbi__err("outofmem", "Out of memory");
+
+ img_width_bytes = (((img_n * x * depth) + 7) >> 3);
+ img_len = (img_width_bytes + 1) * y;
+ if (s->img_x == x && s->img_y == y) {
+ if (raw_len != img_len) return stbi__err("not enough pixels","Corrupt PNG");
+ } else { // interlaced:
+ if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG");
+ }
+
+ for (j=0; j < y; ++j) {
+ stbi_uc *cur = a->out + stride*j;
+ stbi_uc *prior = cur - stride;
+ int filter = *raw++;
+ int filter_bytes = img_n;
+ int width = x;
+ if (filter > 4)
+ return stbi__err("invalid filter","Corrupt PNG");
+
+ if (depth < 8) {
+ STBI_ASSERT(img_width_bytes <= x);
+ cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place
+ filter_bytes = 1;
+ width = img_width_bytes;
+ }
+
+ // if first row, use special filter that doesn't sample previous row
+ if (j == 0) filter = first_row_filter[filter];
+
+ // handle first byte explicitly
+ for (k=0; k < filter_bytes; ++k) {
+ switch (filter) {
+ case STBI__F_none : cur[k] = raw[k]; break;
+ case STBI__F_sub : cur[k] = raw[k]; break;
+ case STBI__F_up : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
+ case STBI__F_avg : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break;
+ case STBI__F_paeth : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break;
+ case STBI__F_avg_first : cur[k] = raw[k]; break;
+ case STBI__F_paeth_first: cur[k] = raw[k]; break;
+ }
+ }
+
+ if (depth == 8) {
+ if (img_n != out_n)
+ cur[img_n] = 255; // first pixel
+ raw += img_n;
+ cur += out_n;
+ prior += out_n;
+ } else {
+ raw += 1;
+ cur += 1;
+ prior += 1;
+ }
+
+ // this is a little gross, so that we don't switch per-pixel or per-component
+ if (depth < 8 || img_n == out_n) {
+ int nk = (width - 1)*img_n;
+ #define CASE(f) \
+ case f: \
+ for (k=0; k < nk; ++k)
+ switch (filter) {
+ // "none" filter turns into a memcpy here; make that explicit.
+ case STBI__F_none: memcpy(cur, raw, nk); break;
+ CASE(STBI__F_sub) cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); break;
+ CASE(STBI__F_up) cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
+ CASE(STBI__F_avg) cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); break;
+ CASE(STBI__F_paeth) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); break;
+ CASE(STBI__F_avg_first) cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); break;
+ CASE(STBI__F_paeth_first) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); break;
+ }
+ #undef CASE
+ raw += nk;
+ } else {
+ STBI_ASSERT(img_n+1 == out_n);
+ #define CASE(f) \
+ case f: \
+ for (i=x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \
+ for (k=0; k < img_n; ++k)
+ switch (filter) {
+ CASE(STBI__F_none) cur[k] = raw[k]; break;
+ CASE(STBI__F_sub) cur[k] = STBI__BYTECAST(raw[k] + cur[k-out_n]); break;
+ CASE(STBI__F_up) cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
+ CASE(STBI__F_avg) cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-out_n])>>1)); break;
+ CASE(STBI__F_paeth) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],prior[k],prior[k-out_n])); break;
+ CASE(STBI__F_avg_first) cur[k] = STBI__BYTECAST(raw[k] + (cur[k-out_n] >> 1)); break;
+ CASE(STBI__F_paeth_first) cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],0,0)); break;
+ }
+ #undef CASE
+ }
+ }
+
+ // we make a separate pass to expand bits to pixels; for performance,
+ // this could run two scanlines behind the above code, so it won't
+ // intefere with filtering but will still be in the cache.
+ if (depth < 8) {
+ for (j=0; j < y; ++j) {
+ stbi_uc *cur = a->out + stride*j;
+ stbi_uc *in = a->out + stride*j + x*out_n - img_width_bytes;
+ // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit
+ // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop
+ stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range
+
+ // note that the final byte might overshoot and write more data than desired.
+ // we can allocate enough data that this never writes out of memory, but it
+ // could also overwrite the next scanline. can it overwrite non-empty data
+ // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel.
+ // so we need to explicitly clamp the final ones
+
+ if (depth == 4) {
+ for (k=x*img_n; k >= 2; k-=2, ++in) {
+ *cur++ = scale * ((*in >> 4) );
+ *cur++ = scale * ((*in ) & 0x0f);
+ }
+ if (k > 0) *cur++ = scale * ((*in >> 4) );
+ } else if (depth == 2) {
+ for (k=x*img_n; k >= 4; k-=4, ++in) {
+ *cur++ = scale * ((*in >> 6) );
+ *cur++ = scale * ((*in >> 4) & 0x03);
+ *cur++ = scale * ((*in >> 2) & 0x03);
+ *cur++ = scale * ((*in ) & 0x03);
+ }
+ if (k > 0) *cur++ = scale * ((*in >> 6) );
+ if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03);
+ if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03);
+ } else if (depth == 1) {
+ for (k=x*img_n; k >= 8; k-=8, ++in) {
+ *cur++ = scale * ((*in >> 7) );
+ *cur++ = scale * ((*in >> 6) & 0x01);
+ *cur++ = scale * ((*in >> 5) & 0x01);
+ *cur++ = scale * ((*in >> 4) & 0x01);
+ *cur++ = scale * ((*in >> 3) & 0x01);
+ *cur++ = scale * ((*in >> 2) & 0x01);
+ *cur++ = scale * ((*in >> 1) & 0x01);
+ *cur++ = scale * ((*in ) & 0x01);
+ }
+ if (k > 0) *cur++ = scale * ((*in >> 7) );
+ if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01);
+ if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01);
+ if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01);
+ if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01);
+ if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01);
+ if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01);
+ }
+ if (img_n != out_n) {
+ int q;
+ // insert alpha = 255
+ cur = a->out + stride*j;
+ if (img_n == 1) {
+ for (q=x-1; q >= 0; --q) {
+ cur[q*2+1] = 255;
+ cur[q*2+0] = cur[q];
+ }
+ } else {
+ STBI_ASSERT(img_n == 3);
+ for (q=x-1; q >= 0; --q) {
+ cur[q*4+3] = 255;
+ cur[q*4+2] = cur[q*3+2];
+ cur[q*4+1] = cur[q*3+1];
+ cur[q*4+0] = cur[q*3+0];
+ }
+ }
+ }
+ }
+ }
+
+ return 1;
+}
+
+static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced)
+{
+ stbi_uc *final;
+ int p;
+ if (!interlaced)
+ return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color);
+
+ // de-interlacing
+ final = (stbi_uc *) stbi__malloc(a->s->img_x * a->s->img_y * out_n);
+ for (p=0; p < 7; ++p) {
+ int xorig[] = { 0,4,0,2,0,1,0 };
+ int yorig[] = { 0,0,4,0,2,0,1 };
+ int xspc[] = { 8,8,4,4,2,2,1 };
+ int yspc[] = { 8,8,8,4,4,2,2 };
+ int i,j,x,y;
+ // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
+ x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p];
+ y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p];
+ if (x && y) {
+ stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
+ if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) {
+ STBI_FREE(final);
+ return 0;
+ }
+ for (j=0; j < y; ++j) {
+ for (i=0; i < x; ++i) {
+ int out_y = j*yspc[p]+yorig[p];
+ int out_x = i*xspc[p]+xorig[p];
+ memcpy(final + out_y*a->s->img_x*out_n + out_x*out_n,
+ a->out + (j*x+i)*out_n, out_n);
+ }
+ }
+ STBI_FREE(a->out);
+ image_data += img_len;
+ image_data_len -= img_len;
+ }
+ }
+ a->out = final;
+
+ return 1;
+}
+
+static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n)
+{
+ stbi__context *s = z->s;
+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+ stbi_uc *p = z->out;
+
+ // compute color-based transparency, assuming we've
+ // already got 255 as the alpha value in the output
+ STBI_ASSERT(out_n == 2 || out_n == 4);
+
+ if (out_n == 2) {
+ for (i=0; i < pixel_count; ++i) {
+ p[1] = (p[0] == tc[0] ? 0 : 255);
+ p += 2;
+ }
+ } else {
+ for (i=0; i < pixel_count; ++i) {
+ if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+ p[3] = 0;
+ p += 4;
+ }
+ }
+ return 1;
+}
+
+static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n)
+{
+ stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
+ stbi_uc *p, *temp_out, *orig = a->out;
+
+ p = (stbi_uc *) stbi__malloc(pixel_count * pal_img_n);
+ if (p == NULL) return stbi__err("outofmem", "Out of memory");
+
+ // between here and free(out) below, exitting would leak
+ temp_out = p;
+
+ if (pal_img_n == 3) {
+ for (i=0; i < pixel_count; ++i) {
+ int n = orig[i]*4;
+ p[0] = palette[n ];
+ p[1] = palette[n+1];
+ p[2] = palette[n+2];
+ p += 3;
+ }
+ } else {
+ for (i=0; i < pixel_count; ++i) {
+ int n = orig[i]*4;
+ p[0] = palette[n ];
+ p[1] = palette[n+1];
+ p[2] = palette[n+2];
+ p[3] = palette[n+3];
+ p += 4;
+ }
+ }
+ STBI_FREE(a->out);
+ a->out = temp_out;
+
+ STBI_NOTUSED(len);
+
+ return 1;
+}
+
+static int stbi__unpremultiply_on_load = 0;
+static int stbi__de_iphone_flag = 0;
+
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
+{
+ stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply;
+}
+
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
+{
+ stbi__de_iphone_flag = flag_true_if_should_convert;
+}
+
+static void stbi__de_iphone(stbi__png *z)
+{
+ stbi__context *s = z->s;
+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+ stbi_uc *p = z->out;
+
+ if (s->img_out_n == 3) { // convert bgr to rgb
+ for (i=0; i < pixel_count; ++i) {
+ stbi_uc t = p[0];
+ p[0] = p[2];
+ p[2] = t;
+ p += 3;
+ }
+ } else {
+ STBI_ASSERT(s->img_out_n == 4);
+ if (stbi__unpremultiply_on_load) {
+ // convert bgr to rgb and unpremultiply
+ for (i=0; i < pixel_count; ++i) {
+ stbi_uc a = p[3];
+ stbi_uc t = p[0];
+ if (a) {
+ p[0] = p[2] * 255 / a;
+ p[1] = p[1] * 255 / a;
+ p[2] = t * 255 / a;
+ } else {
+ p[0] = p[2];
+ p[2] = t;
+ }
+ p += 4;
+ }
+ } else {
+ // convert bgr to rgb
+ for (i=0; i < pixel_count; ++i) {
+ stbi_uc t = p[0];
+ p[0] = p[2];
+ p[2] = t;
+ p += 4;
+ }
+ }
+ }
+}
+
+#define STBI__PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
+
+static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
+{
+ stbi_uc palette[1024], pal_img_n=0;
+ stbi_uc has_trans=0, tc[3];
+ stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0;
+ int first=1,k,interlace=0, color=0, depth=0, is_iphone=0;
+ stbi__context *s = z->s;
+
+ z->expanded = NULL;
+ z->idata = NULL;
+ z->out = NULL;
+
+ if (!stbi__check_png_header(s)) return 0;
+
+ if (scan == STBI__SCAN_type) return 1;
+
+ for (;;) {
+ stbi__pngchunk c = stbi__get_chunk_header(s);
+ switch (c.type) {
+ case STBI__PNG_TYPE('C','g','B','I'):
+ is_iphone = 1;
+ stbi__skip(s, c.length);
+ break;
+ case STBI__PNG_TYPE('I','H','D','R'): {
+ int comp,filter;
+ if (!first) return stbi__err("multiple IHDR","Corrupt PNG");
+ first = 0;
+ if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG");
+ s->img_x = stbi__get32be(s); if (s->img_x > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
+ s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
+ depth = stbi__get8(s); if (depth != 1 && depth != 2 && depth != 4 && depth != 8) return stbi__err("1/2/4/8-bit only","PNG not supported: 1/2/4/8-bit only");
+ color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG");
+ if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG");
+ comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG");
+ filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG");
+ interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG");
+ if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG");
+ if (!pal_img_n) {
+ s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
+ if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
+ if (scan == STBI__SCAN_header) return 1;
+ } else {
+ // if paletted, then pal_n is our final components, and
+ // img_n is # components to decompress/filter.
+ s->img_n = 1;
+ if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG");
+ // if SCAN_header, have to scan to see if we have a tRNS
+ }
+ break;
+ }
+
+ case STBI__PNG_TYPE('P','L','T','E'): {
+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+ if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG");
+ pal_len = c.length / 3;
+ if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG");
+ for (i=0; i < pal_len; ++i) {
+ palette[i*4+0] = stbi__get8(s);
+ palette[i*4+1] = stbi__get8(s);
+ palette[i*4+2] = stbi__get8(s);
+ palette[i*4+3] = 255;
+ }
+ break;
+ }
+
+ case STBI__PNG_TYPE('t','R','N','S'): {
+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+ if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG");
+ if (pal_img_n) {
+ if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; }
+ if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG");
+ if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG");
+ pal_img_n = 4;
+ for (i=0; i < c.length; ++i)
+ palette[i*4+3] = stbi__get8(s);
+ } else {
+ if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG");
+ if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG");
+ has_trans = 1;
+ for (k=0; k < s->img_n; ++k)
+ tc[k] = (stbi_uc) (stbi__get16be(s) & 255) * stbi__depth_scale_table[depth]; // non 8-bit images will be larger
+ }
+ break;
+ }
+
+ case STBI__PNG_TYPE('I','D','A','T'): {
+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+ if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
+ if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; }
+ if ((int)(ioff + c.length) < (int)ioff) return 0;
+ if (ioff + c.length > idata_limit) {
+ stbi__uint32 idata_limit_old = idata_limit;
+ stbi_uc *p;
+ if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
+ while (ioff + c.length > idata_limit)
+ idata_limit *= 2;
+ STBI_NOTUSED(idata_limit_old);
+ p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory");
+ z->idata = p;
+ }
+ if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG");
+ ioff += c.length;
+ break;
+ }
+
+ case STBI__PNG_TYPE('I','E','N','D'): {
+ stbi__uint32 raw_len, bpl;
+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+ if (scan != STBI__SCAN_load) return 1;
+ if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG");
+ // initial guess for decoded data size to avoid unnecessary reallocs
+ bpl = (s->img_x * depth + 7) / 8; // bytes per line, per component
+ raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */;
+ z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone);
+ if (z->expanded == NULL) return 0; // zlib should set error
+ STBI_FREE(z->idata); z->idata = NULL;
+ if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
+ s->img_out_n = s->img_n+1;
+ else
+ s->img_out_n = s->img_n;
+ if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, depth, color, interlace)) return 0;
+ if (has_trans)
+ if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0;
+ if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2)
+ stbi__de_iphone(z);
+ if (pal_img_n) {
+ // pal_img_n == 3 or 4
+ s->img_n = pal_img_n; // record the actual colors we had
+ s->img_out_n = pal_img_n;
+ if (req_comp >= 3) s->img_out_n = req_comp;
+ if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n))
+ return 0;
+ }
+ STBI_FREE(z->expanded); z->expanded = NULL;
+ return 1;
+ }
+
+ default:
+ // if critical, fail
+ if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+ if ((c.type & (1 << 29)) == 0) {
+ #ifndef STBI_NO_FAILURE_STRINGS
+ // not threadsafe
+ static char invalid_chunk[] = "XXXX PNG chunk not known";
+ invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
+ invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
+ invalid_chunk[2] = STBI__BYTECAST(c.type >> 8);
+ invalid_chunk[3] = STBI__BYTECAST(c.type >> 0);
+ #endif
+ return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
+ }
+ stbi__skip(s, c.length);
+ break;
+ }
+ // end of PNG chunk, read and skip CRC
+ stbi__get32be(s);
+ }
+}
+
+static unsigned char *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp)
+{
+ unsigned char *result=NULL;
+ if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+ if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {
+ result = p->out;
+ p->out = NULL;
+ if (req_comp && req_comp != p->s->img_out_n) {
+ result = stbi__convert_format(result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
+ p->s->img_out_n = req_comp;
+ if (result == NULL) return result;
+ }
+ *x = p->s->img_x;
+ *y = p->s->img_y;
+ if (n) *n = p->s->img_out_n;
+ }
+ STBI_FREE(p->out); p->out = NULL;
+ STBI_FREE(p->expanded); p->expanded = NULL;
+ STBI_FREE(p->idata); p->idata = NULL;
+
+ return result;
+}
+
+static unsigned char *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ stbi__png p;
+ p.s = s;
+ return stbi__do_png(&p, x,y,comp,req_comp);
+}
+
+static int stbi__png_test(stbi__context *s)
+{
+ int r;
+ r = stbi__check_png_header(s);
+ stbi__rewind(s);
+ return r;
+}
+
+static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp)
+{
+ if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
+ stbi__rewind( p->s );
+ return 0;
+ }
+ if (x) *x = p->s->img_x;
+ if (y) *y = p->s->img_y;
+ if (comp) *comp = p->s->img_n;
+ return 1;
+}
+
+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp)
+{
+ stbi__png p;
+ p.s = s;
+ return stbi__png_info_raw(&p, x, y, comp);
+}
+#endif
+
+// Microsoft/Windows BMP image
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test_raw(stbi__context *s)
+{
+ int r;
+ int sz;
+ if (stbi__get8(s) != 'B') return 0;
+ if (stbi__get8(s) != 'M') return 0;
+ stbi__get32le(s); // discard filesize
+ stbi__get16le(s); // discard reserved
+ stbi__get16le(s); // discard reserved
+ stbi__get32le(s); // discard data offset
+ sz = stbi__get32le(s);
+ r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
+ return r;
+}
+
+static int stbi__bmp_test(stbi__context *s)
+{
+ int r = stbi__bmp_test_raw(s);
+ stbi__rewind(s);
+ return r;
+}
+
+
+// returns 0..31 for the highest set bit
+static int stbi__high_bit(unsigned int z)
+{
+ int n=0;
+ if (z == 0) return -1;
+ if (z >= 0x10000) n += 16, z >>= 16;
+ if (z >= 0x00100) n += 8, z >>= 8;
+ if (z >= 0x00010) n += 4, z >>= 4;
+ if (z >= 0x00004) n += 2, z >>= 2;
+ if (z >= 0x00002) n += 1, z >>= 1;
+ return n;
+}
+
+static int stbi__bitcount(unsigned int a)
+{
+ a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2
+ a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4
+ a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
+ a = (a + (a >> 8)); // max 16 per 8 bits
+ a = (a + (a >> 16)); // max 32 per 8 bits
+ return a & 0xff;
+}
+
+static int stbi__shiftsigned(int v, int shift, int bits)
+{
+ int result;
+ int z=0;
+
+ if (shift < 0) v <<= -shift;
+ else v >>= shift;
+ result = v;
+
+ z = bits;
+ while (z < 8) {
+ result += v >> z;
+ z += bits;
+ }
+ return result;
+}
+
+typedef struct
+{
+ int bpp, offset, hsz;
+ unsigned int mr,mg,mb,ma, all_a;
+} stbi__bmp_data;
+
+static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info)
+{
+ int hsz;
+ if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP");
+ stbi__get32le(s); // discard filesize
+ stbi__get16le(s); // discard reserved
+ stbi__get16le(s); // discard reserved
+ info->offset = stbi__get32le(s);
+ info->hsz = hsz = stbi__get32le(s);
+
+ if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
+ if (hsz == 12) {
+ s->img_x = stbi__get16le(s);
+ s->img_y = stbi__get16le(s);
+ } else {
+ s->img_x = stbi__get32le(s);
+ s->img_y = stbi__get32le(s);
+ }
+ if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP");
+ info->bpp = stbi__get16le(s);
+ if (info->bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit");
+ if (hsz != 12) {
+ int compress = stbi__get32le(s);
+ if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
+ stbi__get32le(s); // discard sizeof
+ stbi__get32le(s); // discard hres
+ stbi__get32le(s); // discard vres
+ stbi__get32le(s); // discard colorsused
+ stbi__get32le(s); // discard max important
+ if (hsz == 40 || hsz == 56) {
+ if (hsz == 56) {
+ stbi__get32le(s);
+ stbi__get32le(s);
+ stbi__get32le(s);
+ stbi__get32le(s);
+ }
+ if (info->bpp == 16 || info->bpp == 32) {
+ info->mr = info->mg = info->mb = 0;
+ if (compress == 0) {
+ if (info->bpp == 32) {
+ info->mr = 0xffu << 16;
+ info->mg = 0xffu << 8;
+ info->mb = 0xffu << 0;
+ info->ma = 0xffu << 24;
+ info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0
+ } else {
+ info->mr = 31u << 10;
+ info->mg = 31u << 5;
+ info->mb = 31u << 0;
+ }
+ } else if (compress == 3) {
+ info->mr = stbi__get32le(s);
+ info->mg = stbi__get32le(s);
+ info->mb = stbi__get32le(s);
+ // not documented, but generated by photoshop and handled by mspaint
+ if (info->mr == info->mg && info->mg == info->mb) {
+ // ?!?!?
+ return stbi__errpuc("bad BMP", "bad BMP");
+ }
+ } else
+ return stbi__errpuc("bad BMP", "bad BMP");
+ }
+ } else {
+ int i;
+ if (hsz != 108 && hsz != 124)
+ return stbi__errpuc("bad BMP", "bad BMP");
+ info->mr = stbi__get32le(s);
+ info->mg = stbi__get32le(s);
+ info->mb = stbi__get32le(s);
+ info->ma = stbi__get32le(s);
+ stbi__get32le(s); // discard color space
+ for (i=0; i < 12; ++i)
+ stbi__get32le(s); // discard color space parameters
+ if (hsz == 124) {
+ stbi__get32le(s); // discard rendering intent
+ stbi__get32le(s); // discard offset of profile data
+ stbi__get32le(s); // discard size of profile data
+ stbi__get32le(s); // discard reserved
+ }
+ }
+ }
+ return (void *) 1;
+}
+
+
+static stbi_uc *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ stbi_uc *out;
+ unsigned int mr=0,mg=0,mb=0,ma=0, all_a;
+ stbi_uc pal[256][4];
+ int psize=0,i,j,width;
+ int flip_vertically, pad, target;
+ stbi__bmp_data info;
+
+ info.all_a = 255;
+ if (stbi__bmp_parse_header(s, &info) == NULL)
+ return NULL; // error code already set
+
+ flip_vertically = ((int) s->img_y) > 0;
+ s->img_y = abs((int) s->img_y);
+
+ mr = info.mr;
+ mg = info.mg;
+ mb = info.mb;
+ ma = info.ma;
+ all_a = info.all_a;
+
+ if (info.hsz == 12) {
+ if (info.bpp < 24)
+ psize = (info.offset - 14 - 24) / 3;
+ } else {
+ if (info.bpp < 16)
+ psize = (info.offset - 14 - info.hsz) >> 2;
+ }
+
+ s->img_n = ma ? 4 : 3;
+ if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
+ target = req_comp;
+ else
+ target = s->img_n; // if they want monochrome, we'll post-convert
+
+ out = (stbi_uc *) stbi__malloc(target * s->img_x * s->img_y);
+ if (!out) return stbi__errpuc("outofmem", "Out of memory");
+ if (info.bpp < 16) {
+ int z=0;
+ if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); }
+ for (i=0; i < psize; ++i) {
+ pal[i][2] = stbi__get8(s);
+ pal[i][1] = stbi__get8(s);
+ pal[i][0] = stbi__get8(s);
+ if (info.hsz != 12) stbi__get8(s);
+ pal[i][3] = 255;
+ }
+ stbi__skip(s, info.offset - 14 - info.hsz - psize * (info.hsz == 12 ? 3 : 4));
+ if (info.bpp == 4) width = (s->img_x + 1) >> 1;
+ else if (info.bpp == 8) width = s->img_x;
+ else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); }
+ pad = (-width)&3;
+ for (j=0; j < (int) s->img_y; ++j) {
+ for (i=0; i < (int) s->img_x; i += 2) {
+ int v=stbi__get8(s),v2=0;
+ if (info.bpp == 4) {
+ v2 = v & 15;
+ v >>= 4;
+ }
+ out[z++] = pal[v][0];
+ out[z++] = pal[v][1];
+ out[z++] = pal[v][2];
+ if (target == 4) out[z++] = 255;
+ if (i+1 == (int) s->img_x) break;
+ v = (info.bpp == 8) ? stbi__get8(s) : v2;
+ out[z++] = pal[v][0];
+ out[z++] = pal[v][1];
+ out[z++] = pal[v][2];
+ if (target == 4) out[z++] = 255;
+ }
+ stbi__skip(s, pad);
+ }
+ } else {
+ int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
+ int z = 0;
+ int easy=0;
+ stbi__skip(s, info.offset - 14 - info.hsz);
+ if (info.bpp == 24) width = 3 * s->img_x;
+ else if (info.bpp == 16) width = 2*s->img_x;
+ else /* bpp = 32 and pad = 0 */ width=0;
+ pad = (-width) & 3;
+ if (info.bpp == 24) {
+ easy = 1;
+ } else if (info.bpp == 32) {
+ if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
+ easy = 2;
+ }
+ if (!easy) {
+ if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); }
+ // right shift amt to put high bit in position #7
+ rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr);
+ gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg);
+ bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb);
+ ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma);
+ }
+ for (j=0; j < (int) s->img_y; ++j) {
+ if (easy) {
+ for (i=0; i < (int) s->img_x; ++i) {
+ unsigned char a;
+ out[z+2] = stbi__get8(s);
+ out[z+1] = stbi__get8(s);
+ out[z+0] = stbi__get8(s);
+ z += 3;
+ a = (easy == 2 ? stbi__get8(s) : 255);
+ all_a |= a;
+ if (target == 4) out[z++] = a;
+ }
+ } else {
+ int bpp = info.bpp;
+ for (i=0; i < (int) s->img_x; ++i) {
+ stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s));
+ int a;
+ out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount));
+ out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount));
+ out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount));
+ a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
+ all_a |= a;
+ if (target == 4) out[z++] = STBI__BYTECAST(a);
+ }
+ }
+ stbi__skip(s, pad);
+ }
+ }
+
+ // if alpha channel is all 0s, replace with all 255s
+ if (target == 4 && all_a == 0)
+ for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4)
+ out[i] = 255;
+
+ if (flip_vertically) {
+ stbi_uc t;
+ for (j=0; j < (int) s->img_y>>1; ++j) {
+ stbi_uc *p1 = out + j *s->img_x*target;
+ stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
+ for (i=0; i < (int) s->img_x*target; ++i) {
+ t = p1[i], p1[i] = p2[i], p2[i] = t;
+ }
+ }
+ }
+
+ if (req_comp && req_comp != target) {
+ out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
+ if (out == NULL) return out; // stbi__convert_format frees input on failure
+ }
+
+ *x = s->img_x;
+ *y = s->img_y;
+ if (comp) *comp = s->img_n;
+ return out;
+}
+#endif
+
+// Targa Truevision - TGA
+// by Jonathan Dummer
+#ifndef STBI_NO_TGA
+// returns STBI_rgb or whatever, 0 on error
+static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16)
+{
+ // only RGB or RGBA (incl. 16bit) or grey allowed
+ if(is_rgb16) *is_rgb16 = 0;
+ switch(bits_per_pixel) {
+ case 8: return STBI_grey;
+ case 16: if(is_grey) return STBI_grey_alpha;
+ // else: fall-through
+ case 15: if(is_rgb16) *is_rgb16 = 1;
+ return STBI_rgb;
+ case 24: // fall-through
+ case 32: return bits_per_pixel/8;
+ default: return 0;
+ }
+}
+
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp)
+{
+ int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp;
+ int sz, tga_colormap_type;
+ stbi__get8(s); // discard Offset
+ tga_colormap_type = stbi__get8(s); // colormap type
+ if( tga_colormap_type > 1 ) {
+ stbi__rewind(s);
+ return 0; // only RGB or indexed allowed
+ }
+ tga_image_type = stbi__get8(s); // image type
+ if ( tga_colormap_type == 1 ) { // colormapped (paletted) image
+ if (tga_image_type != 1 && tga_image_type != 9) {
+ stbi__rewind(s);
+ return 0;
+ }
+ stbi__skip(s,4); // skip index of first colormap entry and number of entries
+ sz = stbi__get8(s); // check bits per palette color entry
+ if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) {
+ stbi__rewind(s);
+ return 0;
+ }
+ stbi__skip(s,4); // skip image x and y origin
+ tga_colormap_bpp = sz;
+ } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE
+ if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) {
+ stbi__rewind(s);
+ return 0; // only RGB or grey allowed, +/- RLE
+ }
+ stbi__skip(s,9); // skip colormap specification and image x/y origin
+ tga_colormap_bpp = 0;
+ }
+ tga_w = stbi__get16le(s);
+ if( tga_w < 1 ) {
+ stbi__rewind(s);
+ return 0; // test width
+ }
+ tga_h = stbi__get16le(s);
+ if( tga_h < 1 ) {
+ stbi__rewind(s);
+ return 0; // test height
+ }
+ tga_bits_per_pixel = stbi__get8(s); // bits per pixel
+ stbi__get8(s); // ignore alpha bits
+ if (tga_colormap_bpp != 0) {
+ if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {
+ // when using a colormap, tga_bits_per_pixel is the size of the indexes
+ // I don't think anything but 8 or 16bit indexes makes sense
+ stbi__rewind(s);
+ return 0;
+ }
+ tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL);
+ } else {
+ tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL);
+ }
+ if(!tga_comp) {
+ stbi__rewind(s);
+ return 0;
+ }
+ if (x) *x = tga_w;
+ if (y) *y = tga_h;
+ if (comp) *comp = tga_comp;
+ return 1; // seems to have passed everything
+}
+
+static int stbi__tga_test(stbi__context *s)
+{
+ int res = 0;
+ int sz, tga_color_type;
+ stbi__get8(s); // discard Offset
+ tga_color_type = stbi__get8(s); // color type
+ if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed
+ sz = stbi__get8(s); // image type
+ if ( tga_color_type == 1 ) { // colormapped (paletted) image
+ if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9
+ stbi__skip(s,4); // skip index of first colormap entry and number of entries
+ sz = stbi__get8(s); // check bits per palette color entry
+ if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+ stbi__skip(s,4); // skip image x and y origin
+ } else { // "normal" image w/o colormap
+ if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE
+ stbi__skip(s,9); // skip colormap specification and image x/y origin
+ }
+ if ( stbi__get16le(s) < 1 ) goto errorEnd; // test width
+ if ( stbi__get16le(s) < 1 ) goto errorEnd; // test height
+ sz = stbi__get8(s); // bits per pixel
+ if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index
+ if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+
+ res = 1; // if we got this far, everything's good and we can return 1 instead of 0
+
+errorEnd:
+ stbi__rewind(s);
+ return res;
+}
+
+// read 16bit value and convert to 24bit RGB
+void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out)
+{
+ stbi__uint16 px = stbi__get16le(s);
+ stbi__uint16 fiveBitMask = 31;
+ // we have 3 channels with 5bits each
+ int r = (px >> 10) & fiveBitMask;
+ int g = (px >> 5) & fiveBitMask;
+ int b = px & fiveBitMask;
+ // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later
+ out[0] = (r * 255)/31;
+ out[1] = (g * 255)/31;
+ out[2] = (b * 255)/31;
+
+ // some people claim that the most significant bit might be used for alpha
+ // (possibly if an alpha-bit is set in the "image descriptor byte")
+ // but that only made 16bit test images completely translucent..
+ // so let's treat all 15 and 16bit TGAs as RGB with no alpha.
+}
+
+static stbi_uc *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ // read in the TGA header stuff
+ int tga_offset = stbi__get8(s);
+ int tga_indexed = stbi__get8(s);
+ int tga_image_type = stbi__get8(s);
+ int tga_is_RLE = 0;
+ int tga_palette_start = stbi__get16le(s);
+ int tga_palette_len = stbi__get16le(s);
+ int tga_palette_bits = stbi__get8(s);
+ int tga_x_origin = stbi__get16le(s);
+ int tga_y_origin = stbi__get16le(s);
+ int tga_width = stbi__get16le(s);
+ int tga_height = stbi__get16le(s);
+ int tga_bits_per_pixel = stbi__get8(s);
+ int tga_comp, tga_rgb16=0;
+ int tga_inverted = stbi__get8(s);
+ // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?)
+ // image data
+ unsigned char *tga_data;
+ unsigned char *tga_palette = NULL;
+ int i, j;
+ unsigned char raw_data[4];
+ int RLE_count = 0;
+ int RLE_repeating = 0;
+ int read_next_pixel = 1;
+
+ // do a tiny bit of precessing
+ if ( tga_image_type >= 8 )
+ {
+ tga_image_type -= 8;
+ tga_is_RLE = 1;
+ }
+ tga_inverted = 1 - ((tga_inverted >> 5) & 1);
+
+ // If I'm paletted, then I'll use the number of bits from the palette
+ if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
+ else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16);
+
+ if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency
+ return stbi__errpuc("bad format", "Can't find out TGA pixelformat");
+
+ // tga info
+ *x = tga_width;
+ *y = tga_height;
+ if (comp) *comp = tga_comp;
+
+ tga_data = (unsigned char*)stbi__malloc( (size_t)tga_width * tga_height * tga_comp );
+ if (!tga_data) return stbi__errpuc("outofmem", "Out of memory");
+
+ // skip to the data's starting position (offset usually = 0)
+ stbi__skip(s, tga_offset );
+
+ if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) {
+ for (i=0; i < tga_height; ++i) {
+ int row = tga_inverted ? tga_height -i - 1 : i;
+ stbi_uc *tga_row = tga_data + row*tga_width*tga_comp;
+ stbi__getn(s, tga_row, tga_width * tga_comp);
+ }
+ } else {
+ // do I need to load a palette?
+ if ( tga_indexed)
+ {
+ // any data to skip? (offset usually = 0)
+ stbi__skip(s, tga_palette_start );
+ // load the palette
+ tga_palette = (unsigned char*)stbi__malloc( tga_palette_len * tga_comp );
+ if (!tga_palette) {
+ STBI_FREE(tga_data);
+ return stbi__errpuc("outofmem", "Out of memory");
+ }
+ if (tga_rgb16) {
+ stbi_uc *pal_entry = tga_palette;
+ STBI_ASSERT(tga_comp == STBI_rgb);
+ for (i=0; i < tga_palette_len; ++i) {
+ stbi__tga_read_rgb16(s, pal_entry);
+ pal_entry += tga_comp;
+ }
+ } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) {
+ STBI_FREE(tga_data);
+ STBI_FREE(tga_palette);
+ return stbi__errpuc("bad palette", "Corrupt TGA");
+ }
+ }
+ // load the data
+ for (i=0; i < tga_width * tga_height; ++i)
+ {
+ // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
+ if ( tga_is_RLE )
+ {
+ if ( RLE_count == 0 )
+ {
+ // yep, get the next byte as a RLE command
+ int RLE_cmd = stbi__get8(s);
+ RLE_count = 1 + (RLE_cmd & 127);
+ RLE_repeating = RLE_cmd >> 7;
+ read_next_pixel = 1;
+ } else if ( !RLE_repeating )
+ {
+ read_next_pixel = 1;
+ }
+ } else
+ {
+ read_next_pixel = 1;
+ }
+ // OK, if I need to read a pixel, do it now
+ if ( read_next_pixel )
+ {
+ // load however much data we did have
+ if ( tga_indexed )
+ {
+ // read in index, then perform the lookup
+ int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
+ if ( pal_idx >= tga_palette_len ) {
+ // invalid index
+ pal_idx = 0;
+ }
+ pal_idx *= tga_comp;
+ for (j = 0; j < tga_comp; ++j) {
+ raw_data[j] = tga_palette[pal_idx+j];
+ }
+ } else if(tga_rgb16) {
+ STBI_ASSERT(tga_comp == STBI_rgb);
+ stbi__tga_read_rgb16(s, raw_data);
+ } else {
+ // read in the data raw
+ for (j = 0; j < tga_comp; ++j) {
+ raw_data[j] = stbi__get8(s);
+ }
+ }
+ // clear the reading flag for the next pixel
+ read_next_pixel = 0;
+ } // end of reading a pixel
+
+ // copy data
+ for (j = 0; j < tga_comp; ++j)
+ tga_data[i*tga_comp+j] = raw_data[j];
+
+ // in case we're in RLE mode, keep counting down
+ --RLE_count;
+ }
+ // do I need to invert the image?
+ if ( tga_inverted )
+ {
+ for (j = 0; j*2 < tga_height; ++j)
+ {
+ int index1 = j * tga_width * tga_comp;
+ int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
+ for (i = tga_width * tga_comp; i > 0; --i)
+ {
+ unsigned char temp = tga_data[index1];
+ tga_data[index1] = tga_data[index2];
+ tga_data[index2] = temp;
+ ++index1;
+ ++index2;
+ }
+ }
+ }
+ // clear my palette, if I had one
+ if ( tga_palette != NULL )
+ {
+ STBI_FREE( tga_palette );
+ }
+ }
+
+ // swap RGB - if the source data was RGB16, it already is in the right order
+ if (tga_comp >= 3 && !tga_rgb16)
+ {
+ unsigned char* tga_pixel = tga_data;
+ for (i=0; i < tga_width * tga_height; ++i)
+ {
+ unsigned char temp = tga_pixel[0];
+ tga_pixel[0] = tga_pixel[2];
+ tga_pixel[2] = temp;
+ tga_pixel += tga_comp;
+ }
+ }
+
+ // convert to target component count
+ if (req_comp && req_comp != tga_comp)
+ tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
+
+ // the things I do to get rid of an error message, and yet keep
+ // Microsoft's C compilers happy... [8^(
+ tga_palette_start = tga_palette_len = tga_palette_bits =
+ tga_x_origin = tga_y_origin = 0;
+ // OK, done
+ return tga_data;
+}
+#endif
+
+// *************************************************************************************************
+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context *s)
+{
+ int r = (stbi__get32be(s) == 0x38425053);
+ stbi__rewind(s);
+ return r;
+}
+
+static stbi_uc *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ int pixelCount;
+ int channelCount, compression;
+ int channel, i, count, len;
+ int bitdepth;
+ int w,h;
+ stbi_uc *out;
+
+ // Check identifier
+ if (stbi__get32be(s) != 0x38425053) // "8BPS"
+ return stbi__errpuc("not PSD", "Corrupt PSD image");
+
+ // Check file type version.
+ if (stbi__get16be(s) != 1)
+ return stbi__errpuc("wrong version", "Unsupported version of PSD image");
+
+ // Skip 6 reserved bytes.
+ stbi__skip(s, 6 );
+
+ // Read the number of channels (R, G, B, A, etc).
+ channelCount = stbi__get16be(s);
+ if (channelCount < 0 || channelCount > 16)
+ return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image");
+
+ // Read the rows and columns of the image.
+ h = stbi__get32be(s);
+ w = stbi__get32be(s);
+
+ // Make sure the depth is 8 bits.
+ bitdepth = stbi__get16be(s);
+ if (bitdepth != 8 && bitdepth != 16)
+ return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit");
+
+ // Make sure the color mode is RGB.
+ // Valid options are:
+ // 0: Bitmap
+ // 1: Grayscale
+ // 2: Indexed color
+ // 3: RGB color
+ // 4: CMYK color
+ // 7: Multichannel
+ // 8: Duotone
+ // 9: Lab color
+ if (stbi__get16be(s) != 3)
+ return stbi__errpuc("wrong color format", "PSD is not in RGB color format");
+
+ // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.)
+ stbi__skip(s,stbi__get32be(s) );
+
+ // Skip the image resources. (resolution, pen tool paths, etc)
+ stbi__skip(s, stbi__get32be(s) );
+
+ // Skip the reserved data.
+ stbi__skip(s, stbi__get32be(s) );
+
+ // Find out if the data is compressed.
+ // Known values:
+ // 0: no compression
+ // 1: RLE compressed
+ compression = stbi__get16be(s);
+ if (compression > 1)
+ return stbi__errpuc("bad compression", "PSD has an unknown compression format");
+
+ // Create the destination image.
+ out = (stbi_uc *) stbi__malloc(4 * w*h);
+ if (!out) return stbi__errpuc("outofmem", "Out of memory");
+ pixelCount = w*h;
+
+ // Initialize the data to zero.
+ //memset( out, 0, pixelCount * 4 );
+
+ // Finally, the image data.
+ if (compression) {
+ // RLE as used by .PSD and .TIFF
+ // Loop until you get the number of unpacked bytes you are expecting:
+ // Read the next source byte into n.
+ // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
+ // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
+ // Else if n is 128, noop.
+ // Endloop
+
+ // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data,
+ // which we're going to just skip.
+ stbi__skip(s, h * channelCount * 2 );
+
+ // Read the RLE data by channel.
+ for (channel = 0; channel < 4; channel++) {
+ stbi_uc *p;
+
+ p = out+channel;
+ if (channel >= channelCount) {
+ // Fill this channel with default data.
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = (channel == 3 ? 255 : 0);
+ } else {
+ // Read the RLE data.
+ count = 0;
+ while (count < pixelCount) {
+ len = stbi__get8(s);
+ if (len == 128) {
+ // No-op.
+ } else if (len < 128) {
+ // Copy next len+1 bytes literally.
+ len++;
+ count += len;
+ while (len) {
+ *p = stbi__get8(s);
+ p += 4;
+ len--;
+ }
+ } else if (len > 128) {
+ stbi_uc val;
+ // Next -len+1 bytes in the dest are replicated from next source byte.
+ // (Interpret len as a negative 8-bit int.)
+ len ^= 0x0FF;
+ len += 2;
+ val = stbi__get8(s);
+ count += len;
+ while (len) {
+ *p = val;
+ p += 4;
+ len--;
+ }
+ }
+ }
+ }
+ }
+
+ } else {
+ // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...)
+ // where each channel consists of an 8-bit value for each pixel in the image.
+
+ // Read the data by channel.
+ for (channel = 0; channel < 4; channel++) {
+ stbi_uc *p;
+
+ p = out + channel;
+ if (channel >= channelCount) {
+ // Fill this channel with default data.
+ stbi_uc val = channel == 3 ? 255 : 0;
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = val;
+ } else {
+ // Read the data.
+ if (bitdepth == 16) {
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = (stbi_uc) (stbi__get16be(s) >> 8);
+ } else {
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = stbi__get8(s);
+ }
+ }
+ }
+ }
+
+ if (req_comp && req_comp != 4) {
+ out = stbi__convert_format(out, 4, req_comp, w, h);
+ if (out == NULL) return out; // stbi__convert_format frees input on failure
+ }
+
+ if (comp) *comp = 4;
+ *y = h;
+ *x = w;
+
+ return out;
+}
+#endif
+
+// *************************************************************************************************
+// Softimage PIC loader
+// by Tom Seddon
+//
+// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
+// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_is4(stbi__context *s,const char *str)
+{
+ int i;
+ for (i=0; i<4; ++i)
+ if (stbi__get8(s) != (stbi_uc)str[i])
+ return 0;
+
+ return 1;
+}
+
+static int stbi__pic_test_core(stbi__context *s)
+{
+ int i;
+
+ if (!stbi__pic_is4(s,"\x53\x80\xF6\x34"))
+ return 0;
+
+ for(i=0;i<84;++i)
+ stbi__get8(s);
+
+ if (!stbi__pic_is4(s,"PICT"))
+ return 0;
+
+ return 1;
+}
+
+typedef struct
+{
+ stbi_uc size,type,channel;
+} stbi__pic_packet;
+
+static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest)
+{
+ int mask=0x80, i;
+
+ for (i=0; i<4; ++i, mask>>=1) {
+ if (channel & mask) {
+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short");
+ dest[i]=stbi__get8(s);
+ }
+ }
+
+ return dest;
+}
+
+static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src)
+{
+ int mask=0x80,i;
+
+ for (i=0;i<4; ++i, mask>>=1)
+ if (channel&mask)
+ dest[i]=src[i];
+}
+
+static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result)
+{
+ int act_comp=0,num_packets=0,y,chained;
+ stbi__pic_packet packets[10];
+
+ // this will (should...) cater for even some bizarre stuff like having data
+ // for the same channel in multiple packets.
+ do {
+ stbi__pic_packet *packet;
+
+ if (num_packets==sizeof(packets)/sizeof(packets[0]))
+ return stbi__errpuc("bad format","too many packets");
+
+ packet = &packets[num_packets++];
+
+ chained = stbi__get8(s);
+ packet->size = stbi__get8(s);
+ packet->type = stbi__get8(s);
+ packet->channel = stbi__get8(s);
+
+ act_comp |= packet->channel;
+
+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (reading packets)");
+ if (packet->size != 8) return stbi__errpuc("bad format","packet isn't 8bpp");
+ } while (chained);
+
+ *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
+
+ for(y=0; y<height; ++y) {
+ int packet_idx;
+
+ for(packet_idx=0; packet_idx < num_packets; ++packet_idx) {
+ stbi__pic_packet *packet = &packets[packet_idx];
+ stbi_uc *dest = result+y*width*4;
+
+ switch (packet->type) {
+ default:
+ return stbi__errpuc("bad format","packet has bad compression type");
+
+ case 0: {//uncompressed
+ int x;
+
+ for(x=0;x<width;++x, dest+=4)
+ if (!stbi__readval(s,packet->channel,dest))
+ return 0;
+ break;
+ }
+
+ case 1://Pure RLE
+ {
+ int left=width, i;
+
+ while (left>0) {
+ stbi_uc count,value[4];
+
+ count=stbi__get8(s);
+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)");
+
+ if (count > left)
+ count = (stbi_uc) left;
+
+ if (!stbi__readval(s,packet->channel,value)) return 0;
+
+ for(i=0; i<count; ++i,dest+=4)
+ stbi__copyval(packet->channel,dest,value);
+ left -= count;
+ }
+ }
+ break;
+
+ case 2: {//Mixed RLE
+ int left=width;
+ while (left>0) {
+ int count = stbi__get8(s), i;
+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)");
+
+ if (count >= 128) { // Repeated
+ stbi_uc value[4];
+
+ if (count==128)
+ count = stbi__get16be(s);
+ else
+ count -= 127;
+ if (count > left)
+ return stbi__errpuc("bad file","scanline overrun");
+
+ if (!stbi__readval(s,packet->channel,value))
+ return 0;
+
+ for(i=0;i<count;++i, dest += 4)
+ stbi__copyval(packet->channel,dest,value);
+ } else { // Raw
+ ++count;
+ if (count>left) return stbi__errpuc("bad file","scanline overrun");
+
+ for(i=0;i<count;++i, dest+=4)
+ if (!stbi__readval(s,packet->channel,dest))
+ return 0;
+ }
+ left-=count;
+ }
+ break;
+ }
+ }
+ }
+ }
+
+ return result;
+}
+
+static stbi_uc *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp)
+{
+ stbi_uc *result;
+ int i, x,y;
+
+ for (i=0; i<92; ++i)
+ stbi__get8(s);
+
+ x = stbi__get16be(s);
+ y = stbi__get16be(s);
+ if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)");
+ if ((1 << 28) / x < y) return stbi__errpuc("too large", "Image too large to decode");
+
+ stbi__get32be(s); //skip `ratio'
+ stbi__get16be(s); //skip `fields'
+ stbi__get16be(s); //skip `pad'
+
+ // intermediate buffer is RGBA
+ result = (stbi_uc *) stbi__malloc(x*y*4);
+ memset(result, 0xff, x*y*4);
+
+ if (!stbi__pic_load_core(s,x,y,comp, result)) {
+ STBI_FREE(result);
+ result=0;
+ }
+ *px = x;
+ *py = y;
+ if (req_comp == 0) req_comp = *comp;
+ result=stbi__convert_format(result,4,req_comp,x,y);
+
+ return result;
+}
+
+static int stbi__pic_test(stbi__context *s)
+{
+ int r = stbi__pic_test_core(s);
+ stbi__rewind(s);
+ return r;
+}
+#endif
+
+// *************************************************************************************************
+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+
+#ifndef STBI_NO_GIF
+typedef struct
+{
+ stbi__int16 prefix;
+ stbi_uc first;
+ stbi_uc suffix;
+} stbi__gif_lzw;
+
+typedef struct
+{
+ int w,h;
+ stbi_uc *out, *old_out; // output buffer (always 4 components)
+ int flags, bgindex, ratio, transparent, eflags, delay;
+ stbi_uc pal[256][4];
+ stbi_uc lpal[256][4];
+ stbi__gif_lzw codes[4096];
+ stbi_uc *color_table;
+ int parse, step;
+ int lflags;
+ int start_x, start_y;
+ int max_x, max_y;
+ int cur_x, cur_y;
+ int line_size;
+} stbi__gif;
+
+static int stbi__gif_test_raw(stbi__context *s)
+{
+ int sz;
+ if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0;
+ sz = stbi__get8(s);
+ if (sz != '9' && sz != '7') return 0;
+ if (stbi__get8(s) != 'a') return 0;
+ return 1;
+}
+
+static int stbi__gif_test(stbi__context *s)
+{
+ int r = stbi__gif_test_raw(s);
+ stbi__rewind(s);
+ return r;
+}
+
+static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp)
+{
+ int i;
+ for (i=0; i < num_entries; ++i) {
+ pal[i][2] = stbi__get8(s);
+ pal[i][1] = stbi__get8(s);
+ pal[i][0] = stbi__get8(s);
+ pal[i][3] = transp == i ? 0 : 255;
+ }
+}
+
+static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info)
+{
+ stbi_uc version;
+ if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8')
+ return stbi__err("not GIF", "Corrupt GIF");
+
+ version = stbi__get8(s);
+ if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF");
+ if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF");
+
+ stbi__g_failure_reason = "";
+ g->w = stbi__get16le(s);
+ g->h = stbi__get16le(s);
+ g->flags = stbi__get8(s);
+ g->bgindex = stbi__get8(s);
+ g->ratio = stbi__get8(s);
+ g->transparent = -1;
+
+ if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments
+
+ if (is_info) return 1;
+
+ if (g->flags & 0x80)
+ stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1);
+
+ return 1;
+}
+
+static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp)
+{
+ stbi__gif g;
+ if (!stbi__gif_header(s, &g, comp, 1)) {
+ stbi__rewind( s );
+ return 0;
+ }
+ if (x) *x = g.w;
+ if (y) *y = g.h;
+ return 1;
+}
+
+static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code)
+{
+ stbi_uc *p, *c;
+
+ // recurse to decode the prefixes, since the linked-list is backwards,
+ // and working backwards through an interleaved image would be nasty
+ if (g->codes[code].prefix >= 0)
+ stbi__out_gif_code(g, g->codes[code].prefix);
+
+ if (g->cur_y >= g->max_y) return;
+
+ p = &g->out[g->cur_x + g->cur_y];
+ c = &g->color_table[g->codes[code].suffix * 4];
+
+ if (c[3] >= 128) {
+ p[0] = c[2];
+ p[1] = c[1];
+ p[2] = c[0];
+ p[3] = c[3];
+ }
+ g->cur_x += 4;
+
+ if (g->cur_x >= g->max_x) {
+ g->cur_x = g->start_x;
+ g->cur_y += g->step;
+
+ while (g->cur_y >= g->max_y && g->parse > 0) {
+ g->step = (1 << g->parse) * g->line_size;
+ g->cur_y = g->start_y + (g->step >> 1);
+ --g->parse;
+ }
+ }
+}
+
+static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
+{
+ stbi_uc lzw_cs;
+ stbi__int32 len, init_code;
+ stbi__uint32 first;
+ stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+ stbi__gif_lzw *p;
+
+ lzw_cs = stbi__get8(s);
+ if (lzw_cs > 12) return NULL;
+ clear = 1 << lzw_cs;
+ first = 1;
+ codesize = lzw_cs + 1;
+ codemask = (1 << codesize) - 1;
+ bits = 0;
+ valid_bits = 0;
+ for (init_code = 0; init_code < clear; init_code++) {
+ g->codes[init_code].prefix = -1;
+ g->codes[init_code].first = (stbi_uc) init_code;
+ g->codes[init_code].suffix = (stbi_uc) init_code;
+ }
+
+ // support no starting clear code
+ avail = clear+2;
+ oldcode = -1;
+
+ len = 0;
+ for(;;) {
+ if (valid_bits < codesize) {
+ if (len == 0) {
+ len = stbi__get8(s); // start new block
+ if (len == 0)
+ return g->out;
+ }
+ --len;
+ bits |= (stbi__int32) stbi__get8(s) << valid_bits;
+ valid_bits += 8;
+ } else {
+ stbi__int32 code = bits & codemask;
+ bits >>= codesize;
+ valid_bits -= codesize;
+ // @OPTIMIZE: is there some way we can accelerate the non-clear path?
+ if (code == clear) { // clear code
+ codesize = lzw_cs + 1;
+ codemask = (1 << codesize) - 1;
+ avail = clear + 2;
+ oldcode = -1;
+ first = 0;
+ } else if (code == clear + 1) { // end of stream code
+ stbi__skip(s, len);
+ while ((len = stbi__get8(s)) > 0)
+ stbi__skip(s,len);
+ return g->out;
+ } else if (code <= avail) {
+ if (first) return stbi__errpuc("no clear code", "Corrupt GIF");
+
+ if (oldcode >= 0) {
+ p = &g->codes[avail++];
+ if (avail > 4096) return stbi__errpuc("too many codes", "Corrupt GIF");
+ p->prefix = (stbi__int16) oldcode;
+ p->first = g->codes[oldcode].first;
+ p->suffix = (code == avail) ? p->first : g->codes[code].first;
+ } else if (code == avail)
+ return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+
+ stbi__out_gif_code(g, (stbi__uint16) code);
+
+ if ((avail & codemask) == 0 && avail <= 0x0FFF) {
+ codesize++;
+ codemask = (1 << codesize) - 1;
+ }
+
+ oldcode = code;
+ } else {
+ return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+ }
+ }
+ }
+}
+
+static void stbi__fill_gif_background(stbi__gif *g, int x0, int y0, int x1, int y1)
+{
+ int x, y;
+ stbi_uc *c = g->pal[g->bgindex];
+ for (y = y0; y < y1; y += 4 * g->w) {
+ for (x = x0; x < x1; x += 4) {
+ stbi_uc *p = &g->out[y + x];
+ p[0] = c[2];
+ p[1] = c[1];
+ p[2] = c[0];
+ p[3] = 0;
+ }
+ }
+}
+
+// this function is designed to support animated gifs, although stb_image doesn't support it
+static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp)
+{
+ int i;
+ stbi_uc *prev_out = 0;
+
+ if (g->out == 0 && !stbi__gif_header(s, g, comp,0))
+ return 0; // stbi__g_failure_reason set by stbi__gif_header
+
+ prev_out = g->out;
+ g->out = (stbi_uc *) stbi__malloc(4 * g->w * g->h);
+ if (g->out == 0) return stbi__errpuc("outofmem", "Out of memory");
+
+ switch ((g->eflags & 0x1C) >> 2) {
+ case 0: // unspecified (also always used on 1st frame)
+ stbi__fill_gif_background(g, 0, 0, 4 * g->w, 4 * g->w * g->h);
+ break;
+ case 1: // do not dispose
+ if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h);
+ g->old_out = prev_out;
+ break;
+ case 2: // dispose to background
+ if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h);
+ stbi__fill_gif_background(g, g->start_x, g->start_y, g->max_x, g->max_y);
+ break;
+ case 3: // dispose to previous
+ if (g->old_out) {
+ for (i = g->start_y; i < g->max_y; i += 4 * g->w)
+ memcpy(&g->out[i + g->start_x], &g->old_out[i + g->start_x], g->max_x - g->start_x);
+ }
+ break;
+ }
+
+ for (;;) {
+ switch (stbi__get8(s)) {
+ case 0x2C: /* Image Descriptor */
+ {
+ int prev_trans = -1;
+ stbi__int32 x, y, w, h;
+ stbi_uc *o;
+
+ x = stbi__get16le(s);
+ y = stbi__get16le(s);
+ w = stbi__get16le(s);
+ h = stbi__get16le(s);
+ if (((x + w) > (g->w)) || ((y + h) > (g->h)))
+ return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
+
+ g->line_size = g->w * 4;
+ g->start_x = x * 4;
+ g->start_y = y * g->line_size;
+ g->max_x = g->start_x + w * 4;
+ g->max_y = g->start_y + h * g->line_size;
+ g->cur_x = g->start_x;
+ g->cur_y = g->start_y;
+
+ g->lflags = stbi__get8(s);
+
+ if (g->lflags & 0x40) {
+ g->step = 8 * g->line_size; // first interlaced spacing
+ g->parse = 3;
+ } else {
+ g->step = g->line_size;
+ g->parse = 0;
+ }
+
+ if (g->lflags & 0x80) {
+ stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1);
+ g->color_table = (stbi_uc *) g->lpal;
+ } else if (g->flags & 0x80) {
+ if (g->transparent >= 0 && (g->eflags & 0x01)) {
+ prev_trans = g->pal[g->transparent][3];
+ g->pal[g->transparent][3] = 0;
+ }
+ g->color_table = (stbi_uc *) g->pal;
+ } else
+ return stbi__errpuc("missing color table", "Corrupt GIF");
+
+ o = stbi__process_gif_raster(s, g);
+ if (o == NULL) return NULL;
+
+ if (prev_trans != -1)
+ g->pal[g->transparent][3] = (stbi_uc) prev_trans;
+
+ return o;
+ }
+
+ case 0x21: // Comment Extension.
+ {
+ int len;
+ if (stbi__get8(s) == 0xF9) { // Graphic Control Extension.
+ len = stbi__get8(s);
+ if (len == 4) {
+ g->eflags = stbi__get8(s);
+ g->delay = stbi__get16le(s);
+ g->transparent = stbi__get8(s);
+ } else {
+ stbi__skip(s, len);
+ break;
+ }
+ }
+ while ((len = stbi__get8(s)) != 0)
+ stbi__skip(s, len);
+ break;
+ }
+
+ case 0x3B: // gif stream termination code
+ return (stbi_uc *) s; // using '1' causes warning on some compilers
+
+ default:
+ return stbi__errpuc("unknown code", "Corrupt GIF");
+ }
+ }
+
+ STBI_NOTUSED(req_comp);
+}
+
+static stbi_uc *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ stbi_uc *u = 0;
+ stbi__gif g;
+ memset(&g, 0, sizeof(g));
+
+ u = stbi__gif_load_next(s, &g, comp, req_comp);
+ if (u == (stbi_uc *) s) u = 0; // end of animated gif marker
+ if (u) {
+ *x = g.w;
+ *y = g.h;
+ if (req_comp && req_comp != 4)
+ u = stbi__convert_format(u, 4, req_comp, g.w, g.h);
+ }
+ else if (g.out)
+ STBI_FREE(g.out);
+
+ return u;
+}
+
+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp)
+{
+ return stbi__gif_info_raw(s,x,y,comp);
+}
+#endif
+
+// *************************************************************************************************
+// Radiance RGBE HDR loader
+// originally by Nicolas Schulz
+#ifndef STBI_NO_HDR
+static int stbi__hdr_test_core(stbi__context *s)
+{
+ const char *signature = "#?RADIANCE\n";
+ int i;
+ for (i=0; signature[i]; ++i)
+ if (stbi__get8(s) != signature[i])
+ return 0;
+ return 1;
+}
+
+static int stbi__hdr_test(stbi__context* s)
+{
+ int r = stbi__hdr_test_core(s);
+ stbi__rewind(s);
+ return r;
+}
+
+#define STBI__HDR_BUFLEN 1024
+static char *stbi__hdr_gettoken(stbi__context *z, char *buffer)
+{
+ int len=0;
+ char c = '\0';
+
+ c = (char) stbi__get8(z);
+
+ while (!stbi__at_eof(z) && c != '\n') {
+ buffer[len++] = c;
+ if (len == STBI__HDR_BUFLEN-1) {
+ // flush to end of line
+ while (!stbi__at_eof(z) && stbi__get8(z) != '\n')
+ ;
+ break;
+ }
+ c = (char) stbi__get8(z);
+ }
+
+ buffer[len] = 0;
+ return buffer;
+}
+
+static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp)
+{
+ if ( input[3] != 0 ) {
+ float f1;
+ // Exponent
+ f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8));
+ if (req_comp <= 2)
+ output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
+ else {
+ output[0] = input[0] * f1;
+ output[1] = input[1] * f1;
+ output[2] = input[2] * f1;
+ }
+ if (req_comp == 2) output[1] = 1;
+ if (req_comp == 4) output[3] = 1;
+ } else {
+ switch (req_comp) {
+ case 4: output[3] = 1; /* fallthrough */
+ case 3: output[0] = output[1] = output[2] = 0;
+ break;
+ case 2: output[1] = 1; /* fallthrough */
+ case 1: output[0] = 0;
+ break;
+ }
+ }
+}
+
+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ char buffer[STBI__HDR_BUFLEN];
+ char *token;
+ int valid = 0;
+ int width, height;
+ stbi_uc *scanline;
+ float *hdr_data;
+ int len;
+ unsigned char count, value;
+ int i, j, k, c1,c2, z;
+
+
+ // Check identifier
+ if (strcmp(stbi__hdr_gettoken(s,buffer), "#?RADIANCE") != 0)
+ return stbi__errpf("not HDR", "Corrupt HDR image");
+
+ // Parse header
+ for(;;) {
+ token = stbi__hdr_gettoken(s,buffer);
+ if (token[0] == 0) break;
+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+ }
+
+ if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format");
+
+ // Parse width and height
+ // can't use sscanf() if we're not using stdio!
+ token = stbi__hdr_gettoken(s,buffer);
+ if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+ token += 3;
+ height = (int) strtol(token, &token, 10);
+ while (*token == ' ') ++token;
+ if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+ token += 3;
+ width = (int) strtol(token, NULL, 10);
+
+ *x = width;
+ *y = height;
+
+ if (comp) *comp = 3;
+ if (req_comp == 0) req_comp = 3;
+
+ // Read data
+ hdr_data = (float *) stbi__malloc(height * width * req_comp * sizeof(float));
+
+ // Load image data
+ // image data is stored as some number of sca
+ if ( width < 8 || width >= 32768) {
+ // Read flat data
+ for (j=0; j < height; ++j) {
+ for (i=0; i < width; ++i) {
+ stbi_uc rgbe[4];
+ main_decode_loop:
+ stbi__getn(s, rgbe, 4);
+ stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
+ }
+ }
+ } else {
+ // Read RLE-encoded data
+ scanline = NULL;
+
+ for (j = 0; j < height; ++j) {
+ c1 = stbi__get8(s);
+ c2 = stbi__get8(s);
+ len = stbi__get8(s);
+ if (c1 != 2 || c2 != 2 || (len & 0x80)) {
+ // not run-length encoded, so we have to actually use THIS data as a decoded
+ // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
+ stbi_uc rgbe[4];
+ rgbe[0] = (stbi_uc) c1;
+ rgbe[1] = (stbi_uc) c2;
+ rgbe[2] = (stbi_uc) len;
+ rgbe[3] = (stbi_uc) stbi__get8(s);
+ stbi__hdr_convert(hdr_data, rgbe, req_comp);
+ i = 1;
+ j = 0;
+ STBI_FREE(scanline);
+ goto main_decode_loop; // yes, this makes no sense
+ }
+ len <<= 8;
+ len |= stbi__get8(s);
+ if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); }
+ if (scanline == NULL) scanline = (stbi_uc *) stbi__malloc(width * 4);
+
+ for (k = 0; k < 4; ++k) {
+ i = 0;
+ while (i < width) {
+ count = stbi__get8(s);
+ if (count > 128) {
+ // Run
+ value = stbi__get8(s);
+ count -= 128;
+ for (z = 0; z < count; ++z)
+ scanline[i++ * 4 + k] = value;
+ } else {
+ // Dump
+ for (z = 0; z < count; ++z)
+ scanline[i++ * 4 + k] = stbi__get8(s);
+ }
+ }
+ }
+ for (i=0; i < width; ++i)
+ stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
+ }
+ STBI_FREE(scanline);
+ }
+
+ return hdr_data;
+}
+
+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp)
+{
+ char buffer[STBI__HDR_BUFLEN];
+ char *token;
+ int valid = 0;
+
+ if (stbi__hdr_test(s) == 0) {
+ stbi__rewind( s );
+ return 0;
+ }
+
+ for(;;) {
+ token = stbi__hdr_gettoken(s,buffer);
+ if (token[0] == 0) break;
+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+ }
+
+ if (!valid) {
+ stbi__rewind( s );
+ return 0;
+ }
+ token = stbi__hdr_gettoken(s,buffer);
+ if (strncmp(token, "-Y ", 3)) {
+ stbi__rewind( s );
+ return 0;
+ }
+ token += 3;
+ *y = (int) strtol(token, &token, 10);
+ while (*token == ' ') ++token;
+ if (strncmp(token, "+X ", 3)) {
+ stbi__rewind( s );
+ return 0;
+ }
+ token += 3;
+ *x = (int) strtol(token, NULL, 10);
+ *comp = 3;
+ return 1;
+}
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp)
+{
+ void *p;
+ stbi__bmp_data info;
+
+ info.all_a = 255;
+ p = stbi__bmp_parse_header(s, &info);
+ stbi__rewind( s );
+ if (p == NULL)
+ return 0;
+ *x = s->img_x;
+ *y = s->img_y;
+ *comp = info.ma ? 4 : 3;
+ return 1;
+}
+#endif
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp)
+{
+ int channelCount;
+ if (stbi__get32be(s) != 0x38425053) {
+ stbi__rewind( s );
+ return 0;
+ }
+ if (stbi__get16be(s) != 1) {
+ stbi__rewind( s );
+ return 0;
+ }
+ stbi__skip(s, 6);
+ channelCount = stbi__get16be(s);
+ if (channelCount < 0 || channelCount > 16) {
+ stbi__rewind( s );
+ return 0;
+ }
+ *y = stbi__get32be(s);
+ *x = stbi__get32be(s);
+ if (stbi__get16be(s) != 8) {
+ stbi__rewind( s );
+ return 0;
+ }
+ if (stbi__get16be(s) != 3) {
+ stbi__rewind( s );
+ return 0;
+ }
+ *comp = 4;
+ return 1;
+}
+#endif
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp)
+{
+ int act_comp=0,num_packets=0,chained;
+ stbi__pic_packet packets[10];
+
+ if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) {
+ stbi__rewind(s);
+ return 0;
+ }
+
+ stbi__skip(s, 88);
+
+ *x = stbi__get16be(s);
+ *y = stbi__get16be(s);
+ if (stbi__at_eof(s)) {
+ stbi__rewind( s);
+ return 0;
+ }
+ if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) {
+ stbi__rewind( s );
+ return 0;
+ }
+
+ stbi__skip(s, 8);
+
+ do {
+ stbi__pic_packet *packet;
+
+ if (num_packets==sizeof(packets)/sizeof(packets[0]))
+ return 0;
+
+ packet = &packets[num_packets++];
+ chained = stbi__get8(s);
+ packet->size = stbi__get8(s);
+ packet->type = stbi__get8(s);
+ packet->channel = stbi__get8(s);
+ act_comp |= packet->channel;
+
+ if (stbi__at_eof(s)) {
+ stbi__rewind( s );
+ return 0;
+ }
+ if (packet->size != 8) {
+ stbi__rewind( s );
+ return 0;
+ }
+ } while (chained);
+
+ *comp = (act_comp & 0x10 ? 4 : 3);
+
+ return 1;
+}
+#endif
+
+// *************************************************************************************************
+// Portable Gray Map and Portable Pixel Map loader
+// by Ken Miller
+//
+// PGM: http://netpbm.sourceforge.net/doc/pgm.html
+// PPM: http://netpbm.sourceforge.net/doc/ppm.html
+//
+// Known limitations:
+// Does not support comments in the header section
+// Does not support ASCII image data (formats P2 and P3)
+// Does not support 16-bit-per-channel
+
+#ifndef STBI_NO_PNM
+
+static int stbi__pnm_test(stbi__context *s)
+{
+ char p, t;
+ p = (char) stbi__get8(s);
+ t = (char) stbi__get8(s);
+ if (p != 'P' || (t != '5' && t != '6')) {
+ stbi__rewind( s );
+ return 0;
+ }
+ return 1;
+}
+
+static stbi_uc *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+ stbi_uc *out;
+ if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n))
+ return 0;
+ *x = s->img_x;
+ *y = s->img_y;
+ *comp = s->img_n;
+
+ out = (stbi_uc *) stbi__malloc(s->img_n * s->img_x * s->img_y);
+ if (!out) return stbi__errpuc("outofmem", "Out of memory");
+ stbi__getn(s, out, s->img_n * s->img_x * s->img_y);
+
+ if (req_comp && req_comp != s->img_n) {
+ out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
+ if (out == NULL) return out; // stbi__convert_format frees input on failure
+ }
+ return out;
+}
+
+static int stbi__pnm_isspace(char c)
+{
+ return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
+}
+
+static void stbi__pnm_skip_whitespace(stbi__context *s, char *c)
+{
+ for (;;) {
+ while (!stbi__at_eof(s) && stbi__pnm_isspace(*c))
+ *c = (char) stbi__get8(s);
+
+ if (stbi__at_eof(s) || *c != '#')
+ break;
+
+ while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' )
+ *c = (char) stbi__get8(s);
+ }
+}
+
+static int stbi__pnm_isdigit(char c)
+{
+ return c >= '0' && c <= '9';
+}
+
+static int stbi__pnm_getinteger(stbi__context *s, char *c)
+{
+ int value = 0;
+
+ while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
+ value = value*10 + (*c - '0');
+ *c = (char) stbi__get8(s);
+ }
+
+ return value;
+}
+
+static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
+{
+ int maxv;
+ char c, p, t;
+
+ stbi__rewind( s );
+
+ // Get identifier
+ p = (char) stbi__get8(s);
+ t = (char) stbi__get8(s);
+ if (p != 'P' || (t != '5' && t != '6')) {
+ stbi__rewind( s );
+ return 0;
+ }
+
+ *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm
+
+ c = (char) stbi__get8(s);
+ stbi__pnm_skip_whitespace(s, &c);
+
+ *x = stbi__pnm_getinteger(s, &c); // read width
+ stbi__pnm_skip_whitespace(s, &c);
+
+ *y = stbi__pnm_getinteger(s, &c); // read height
+ stbi__pnm_skip_whitespace(s, &c);
+
+ maxv = stbi__pnm_getinteger(s, &c); // read max value
+
+ if (maxv > 255)
+ return stbi__err("max value > 255", "PPM image not 8-bit");
+ else
+ return 1;
+}
+#endif
+
+static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp)
+{
+ #ifndef STBI_NO_JPEG
+ if (stbi__jpeg_info(s, x, y, comp)) return 1;
+ #endif
+
+ #ifndef STBI_NO_PNG
+ if (stbi__png_info(s, x, y, comp)) return 1;
+ #endif
+
+ #ifndef STBI_NO_GIF
+ if (stbi__gif_info(s, x, y, comp)) return 1;
+ #endif
+
+ #ifndef STBI_NO_BMP
+ if (stbi__bmp_info(s, x, y, comp)) return 1;
+ #endif
+
+ #ifndef STBI_NO_PSD
+ if (stbi__psd_info(s, x, y, comp)) return 1;
+ #endif
+
+ #ifndef STBI_NO_PIC
+ if (stbi__pic_info(s, x, y, comp)) return 1;
+ #endif
+
+ #ifndef STBI_NO_PNM
+ if (stbi__pnm_info(s, x, y, comp)) return 1;
+ #endif
+
+ #ifndef STBI_NO_HDR
+ if (stbi__hdr_info(s, x, y, comp)) return 1;
+ #endif
+
+ // test tga last because it's a crappy test!
+ #ifndef STBI_NO_TGA
+ if (stbi__tga_info(s, x, y, comp))
+ return 1;
+ #endif
+ return stbi__err("unknown image type", "Image not of any known type, or corrupt");
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp)
+{
+ FILE *f = stbi__fopen(filename, "rb");
+ int result;
+ if (!f) return stbi__err("can't fopen", "Unable to open file");
+ result = stbi_info_from_file(f, x, y, comp);
+ fclose(f);
+ return result;
+}
+
+STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
+{
+ int r;
+ stbi__context s;
+ long pos = ftell(f);
+ stbi__start_file(&s, f);
+ r = stbi__info_main(&s,x,y,comp);
+ fseek(f,pos,SEEK_SET);
+ return r;
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp)
+{
+ stbi__context s;
+ stbi__start_mem(&s,buffer,len);
+ return stbi__info_main(&s,x,y,comp);
+}
+
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp)
+{
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
+ return stbi__info_main(&s,x,y,comp);
+}
+
+#endif // STB_IMAGE_IMPLEMENTATION
+
+/*
+ revision history:
+ 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED
+ 2.09 (2016-01-16) allow comments in PNM files
+ 16-bit-per-pixel TGA (not bit-per-component)
+ info() for TGA could break due to .hdr handling
+ info() for BMP to shares code instead of sloppy parse
+ can use STBI_REALLOC_SIZED if allocator doesn't support realloc
+ code cleanup
+ 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
+ 2.07 (2015-09-13) fix compiler warnings
+ partial animated GIF support
+ limited 16-bpc PSD support
+ #ifdef unused functions
+ bug with < 92 byte PIC,PNM,HDR,TGA
+ 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value
+ 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning
+ 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit
+ 2.03 (2015-04-12) extra corruption checking (mmozeiko)
+ stbi_set_flip_vertically_on_load (nguillemot)
+ fix NEON support; fix mingw support
+ 2.02 (2015-01-19) fix incorrect assert, fix warning
+ 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2
+ 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG
+ 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg)
+ progressive JPEG (stb)
+ PGM/PPM support (Ken Miller)
+ STBI_MALLOC,STBI_REALLOC,STBI_FREE
+ GIF bugfix -- seemingly never worked
+ STBI_NO_*, STBI_ONLY_*
+ 1.48 (2014-12-14) fix incorrectly-named assert()
+ 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb)
+ optimize PNG (ryg)
+ fix bug in interlaced PNG with user-specified channel count (stb)
+ 1.46 (2014-08-26)
+ fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG
+ 1.45 (2014-08-16)
+ fix MSVC-ARM internal compiler error by wrapping malloc
+ 1.44 (2014-08-07)
+ various warning fixes from Ronny Chevalier
+ 1.43 (2014-07-15)
+ fix MSVC-only compiler problem in code changed in 1.42
+ 1.42 (2014-07-09)
+ don't define _CRT_SECURE_NO_WARNINGS (affects user code)
+ fixes to stbi__cleanup_jpeg path
+ added STBI_ASSERT to avoid requiring assert.h
+ 1.41 (2014-06-25)
+ fix search&replace from 1.36 that messed up comments/error messages
+ 1.40 (2014-06-22)
+ fix gcc struct-initialization warning
+ 1.39 (2014-06-15)
+ fix to TGA optimization when req_comp != number of components in TGA;
+ fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite)
+ add support for BMP version 5 (more ignored fields)
+ 1.38 (2014-06-06)
+ suppress MSVC warnings on integer casts truncating values
+ fix accidental rename of 'skip' field of I/O
+ 1.37 (2014-06-04)
+ remove duplicate typedef
+ 1.36 (2014-06-03)
+ convert to header file single-file library
+ if de-iphone isn't set, load iphone images color-swapped instead of returning NULL
+ 1.35 (2014-05-27)
+ various warnings
+ fix broken STBI_SIMD path
+ fix bug where stbi_load_from_file no longer left file pointer in correct place
+ fix broken non-easy path for 32-bit BMP (possibly never used)
+ TGA optimization by Arseny Kapoulkine
+ 1.34 (unknown)
+ use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case
+ 1.33 (2011-07-14)
+ make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements
+ 1.32 (2011-07-13)
+ support for "info" function for all supported filetypes (SpartanJ)
+ 1.31 (2011-06-20)
+ a few more leak fixes, bug in PNG handling (SpartanJ)
+ 1.30 (2011-06-11)
+ added ability to load files via callbacks to accomidate custom input streams (Ben Wenger)
+ removed deprecated format-specific test/load functions
+ removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway
+ error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha)
+ fix inefficiency in decoding 32-bit BMP (David Woo)
+ 1.29 (2010-08-16)
+ various warning fixes from Aurelien Pocheville
+ 1.28 (2010-08-01)
+ fix bug in GIF palette transparency (SpartanJ)
+ 1.27 (2010-08-01)
+ cast-to-stbi_uc to fix warnings
+ 1.26 (2010-07-24)
+ fix bug in file buffering for PNG reported by SpartanJ
+ 1.25 (2010-07-17)
+ refix trans_data warning (Won Chun)
+ 1.24 (2010-07-12)
+ perf improvements reading from files on platforms with lock-heavy fgetc()
+ minor perf improvements for jpeg
+ deprecated type-specific functions so we'll get feedback if they're needed
+ attempt to fix trans_data warning (Won Chun)
+ 1.23 fixed bug in iPhone support
+ 1.22 (2010-07-10)
+ removed image *writing* support
+ stbi_info support from Jetro Lauha
+ GIF support from Jean-Marc Lienher
+ iPhone PNG-extensions from James Brown
+ warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva)
+ 1.21 fix use of 'stbi_uc' in header (reported by jon blow)
+ 1.20 added support for Softimage PIC, by Tom Seddon
+ 1.19 bug in interlaced PNG corruption check (found by ryg)
+ 1.18 (2008-08-02)
+ fix a threading bug (local mutable static)
+ 1.17 support interlaced PNG
+ 1.16 major bugfix - stbi__convert_format converted one too many pixels
+ 1.15 initialize some fields for thread safety
+ 1.14 fix threadsafe conversion bug
+ header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
+ 1.13 threadsafe
+ 1.12 const qualifiers in the API
+ 1.11 Support installable IDCT, colorspace conversion routines
+ 1.10 Fixes for 64-bit (don't use "unsigned long")
+ optimized upsampling by Fabian "ryg" Giesen
+ 1.09 Fix format-conversion for PSD code (bad global variables!)
+ 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz
+ 1.07 attempt to fix C++ warning/errors again
+ 1.06 attempt to fix C++ warning/errors again
+ 1.05 fix TGA loading to return correct *comp and use good luminance calc
+ 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free
+ 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR
+ 1.02 support for (subset of) HDR files, float interface for preferred access to them
+ 1.01 fix bug: possible bug in handling right-side up bmps... not sure
+ fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all
+ 1.00 interface to zlib that skips zlib header
+ 0.99 correct handling of alpha in palette
+ 0.98 TGA loader by lonesock; dynamically add loaders (untested)
+ 0.97 jpeg errors on too large a file; also catch another malloc failure
+ 0.96 fix detection of invalid v value - particleman@mollyrocket forum
+ 0.95 during header scan, seek to markers in case of padding
+ 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same
+ 0.93 handle jpegtran output; verbose errors
+ 0.92 read 4,8,16,24,32-bit BMP files of several formats
+ 0.91 output 24-bit Windows 3.0 BMP files
+ 0.90 fix a few more warnings; bump version number to approach 1.0
+ 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd
+ 0.60 fix compiling as c++
+ 0.59 fix warnings: merge Dave Moore's -Wall fixes
+ 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian
+ 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available
+ 0.56 fix bug: zlib uncompressed mode len vs. nlen
+ 0.55 fix bug: restart_interval not initialized to 0
+ 0.54 allow NULL for 'int *comp'
+ 0.53 fix bug in png 3->4; speedup png decoding
+ 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments
+ 0.51 obey req_comp requests, 1-component jpegs return as 1-component,
+ on 'test' only check type, not whether we support this variant
+ 0.50 (2006-11-19)
+ first released version
+*/
diff --git a/deps/nanovg/stb_truetype.h b/deps/nanovg/stb_truetype.h
@@ -0,0 +1,3249 @@
+// stb_truetype.h - v1.09 - public domain
+// authored from 2009-2015 by Sean Barrett / RAD Game Tools
+//
+// This library processes TrueType files:
+// parse files
+// extract glyph metrics
+// extract glyph shapes
+// render glyphs to one-channel bitmaps with antialiasing (box filter)
+//
+// Todo:
+// non-MS cmaps
+// crashproof on bad data
+// hinting? (no longer patented)
+// cleartype-style AA?
+// optimize: use simple memory allocator for intermediates
+// optimize: build edge-list directly from curves
+// optimize: rasterize directly from curves?
+//
+// ADDITIONAL CONTRIBUTORS
+//
+// Mikko Mononen: compound shape support, more cmap formats
+// Tor Andersson: kerning, subpixel rendering
+//
+// Bug/warning reports/fixes:
+// "Zer" on mollyrocket (with fix)
+// Cass Everitt
+// stoiko (Haemimont Games)
+// Brian Hook
+// Walter van Niftrik
+// David Gow
+// David Given
+// Ivan-Assen Ivanov
+// Anthony Pesch
+// Johan Duparc
+// Hou Qiming
+// Fabian "ryg" Giesen
+// Martins Mozeiko
+// Cap Petschulat
+// Omar Cornut
+// github:aloucks
+// Peter LaValle
+// Sergey Popov
+// Giumo X. Clanjor
+// Higor Euripedes
+// Thomas Fields
+// Derek Vinyard
+//
+// Misc other:
+// Ryan Gordon
+//
+// VERSION HISTORY
+//
+// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly
+// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
+// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
+// variant PackFontRanges to pack and render in separate phases;
+// fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
+// fixed an assert() bug in the new rasterizer
+// replace assert() with STBTT_assert() in new rasterizer
+// 1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine)
+// also more precise AA rasterizer, except if shapes overlap
+// remove need for STBTT_sort
+// 1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC
+// 1.04 (2015-04-15) typo in example
+// 1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes
+//
+// Full history can be found at the end of this file.
+//
+// LICENSE
+//
+// This software is in the public domain. Where that dedication is not
+// recognized, you are granted a perpetual, irrevocable license to copy,
+// distribute, and modify this file as you see fit.
+//
+// USAGE
+//
+// Include this file in whatever places neeed to refer to it. In ONE C/C++
+// file, write:
+// #define STB_TRUETYPE_IMPLEMENTATION
+// before the #include of this file. This expands out the actual
+// implementation into that C/C++ file.
+//
+// To make the implementation private to the file that generates the implementation,
+// #define STBTT_STATIC
+//
+// Simple 3D API (don't ship this, but it's fine for tools and quick start)
+// stbtt_BakeFontBitmap() -- bake a font to a bitmap for use as texture
+// stbtt_GetBakedQuad() -- compute quad to draw for a given char
+//
+// Improved 3D API (more shippable):
+// #include "stb_rect_pack.h" -- optional, but you really want it
+// stbtt_PackBegin()
+// stbtt_PackSetOversample() -- for improved quality on small fonts
+// stbtt_PackFontRanges() -- pack and renders
+// stbtt_PackEnd()
+// stbtt_GetPackedQuad()
+//
+// "Load" a font file from a memory buffer (you have to keep the buffer loaded)
+// stbtt_InitFont()
+// stbtt_GetFontOffsetForIndex() -- use for TTC font collections
+//
+// Render a unicode codepoint to a bitmap
+// stbtt_GetCodepointBitmap() -- allocates and returns a bitmap
+// stbtt_MakeCodepointBitmap() -- renders into bitmap you provide
+// stbtt_GetCodepointBitmapBox() -- how big the bitmap must be
+//
+// Character advance/positioning
+// stbtt_GetCodepointHMetrics()
+// stbtt_GetFontVMetrics()
+// stbtt_GetCodepointKernAdvance()
+//
+// Starting with version 1.06, the rasterizer was replaced with a new,
+// faster and generally-more-precise rasterizer. The new rasterizer more
+// accurately measures pixel coverage for anti-aliasing, except in the case
+// where multiple shapes overlap, in which case it overestimates the AA pixel
+// coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If
+// this turns out to be a problem, you can re-enable the old rasterizer with
+// #define STBTT_RASTERIZER_VERSION 1
+// which will incur about a 15% speed hit.
+//
+// ADDITIONAL DOCUMENTATION
+//
+// Immediately after this block comment are a series of sample programs.
+//
+// After the sample programs is the "header file" section. This section
+// includes documentation for each API function.
+//
+// Some important concepts to understand to use this library:
+//
+// Codepoint
+// Characters are defined by unicode codepoints, e.g. 65 is
+// uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is
+// the hiragana for "ma".
+//
+// Glyph
+// A visual character shape (every codepoint is rendered as
+// some glyph)
+//
+// Glyph index
+// A font-specific integer ID representing a glyph
+//
+// Baseline
+// Glyph shapes are defined relative to a baseline, which is the
+// bottom of uppercase characters. Characters extend both above
+// and below the baseline.
+//
+// Current Point
+// As you draw text to the screen, you keep track of a "current point"
+// which is the origin of each character. The current point's vertical
+// position is the baseline. Even "baked fonts" use this model.
+//
+// Vertical Font Metrics
+// The vertical qualities of the font, used to vertically position
+// and space the characters. See docs for stbtt_GetFontVMetrics.
+//
+// Font Size in Pixels or Points
+// The preferred interface for specifying font sizes in stb_truetype
+// is to specify how tall the font's vertical extent should be in pixels.
+// If that sounds good enough, skip the next paragraph.
+//
+// Most font APIs instead use "points", which are a common typographic
+// measurement for describing font size, defined as 72 points per inch.
+// stb_truetype provides a point API for compatibility. However, true
+// "per inch" conventions don't make much sense on computer displays
+// since they different monitors have different number of pixels per
+// inch. For example, Windows traditionally uses a convention that
+// there are 96 pixels per inch, thus making 'inch' measurements have
+// nothing to do with inches, and thus effectively defining a point to
+// be 1.333 pixels. Additionally, the TrueType font data provides
+// an explicit scale factor to scale a given font's glyphs to points,
+// but the author has observed that this scale factor is often wrong
+// for non-commercial fonts, thus making fonts scaled in points
+// according to the TrueType spec incoherently sized in practice.
+//
+// ADVANCED USAGE
+//
+// Quality:
+//
+// - Use the functions with Subpixel at the end to allow your characters
+// to have subpixel positioning. Since the font is anti-aliased, not
+// hinted, this is very import for quality. (This is not possible with
+// baked fonts.)
+//
+// - Kerning is now supported, and if you're supporting subpixel rendering
+// then kerning is worth using to give your text a polished look.
+//
+// Performance:
+//
+// - Convert Unicode codepoints to glyph indexes and operate on the glyphs;
+// if you don't do this, stb_truetype is forced to do the conversion on
+// every call.
+//
+// - There are a lot of memory allocations. We should modify it to take
+// a temp buffer and allocate from the temp buffer (without freeing),
+// should help performance a lot.
+//
+// NOTES
+//
+// The system uses the raw data found in the .ttf file without changing it
+// and without building auxiliary data structures. This is a bit inefficient
+// on little-endian systems (the data is big-endian), but assuming you're
+// caching the bitmaps or glyph shapes this shouldn't be a big deal.
+//
+// It appears to be very hard to programmatically determine what font a
+// given file is in a general way. I provide an API for this, but I don't
+// recommend it.
+//
+//
+// SOURCE STATISTICS (based on v0.6c, 2050 LOC)
+//
+// Documentation & header file 520 LOC \___ 660 LOC documentation
+// Sample code 140 LOC /
+// Truetype parsing 620 LOC ---- 620 LOC TrueType
+// Software rasterization 240 LOC \ .
+// Curve tesselation 120 LOC \__ 550 LOC Bitmap creation
+// Bitmap management 100 LOC /
+// Baked bitmap interface 70 LOC /
+// Font name matching & access 150 LOC ---- 150
+// C runtime library abstraction 60 LOC ---- 60
+//
+//
+// PERFORMANCE MEASUREMENTS FOR 1.06:
+//
+// 32-bit 64-bit
+// Previous release: 8.83 s 7.68 s
+// Pool allocations: 7.72 s 6.34 s
+// Inline sort : 6.54 s 5.65 s
+// New rasterizer : 5.63 s 5.00 s
+
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+////
+//// SAMPLE PROGRAMS
+////
+//
+// Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless
+//
+#if 0
+#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation
+#include "stb_truetype.h"
+
+unsigned char ttf_buffer[1<<20];
+unsigned char temp_bitmap[512*512];
+
+stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
+GLuint ftex;
+
+void my_stbtt_initfont(void)
+{
+ fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
+ stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits!
+ // can free ttf_buffer at this point
+ glGenTextures(1, &ftex);
+ glBindTexture(GL_TEXTURE_2D, ftex);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
+ // can free temp_bitmap at this point
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+}
+
+void my_stbtt_print(float x, float y, char *text)
+{
+ // assume orthographic projection with units = screen pixels, origin at top left
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, ftex);
+ glBegin(GL_QUADS);
+ while (*text) {
+ if (*text >= 32 && *text < 128) {
+ stbtt_aligned_quad q;
+ stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9
+ glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
+ glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
+ glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
+ glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1);
+ }
+ ++text;
+ }
+ glEnd();
+}
+#endif
+//
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Complete program (this compiles): get a single bitmap, print as ASCII art
+//
+#if 0
+#include <stdio.h>
+#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation
+#include "stb_truetype.h"
+
+char ttf_buffer[1<<25];
+
+int main(int argc, char **argv)
+{
+ stbtt_fontinfo font;
+ unsigned char *bitmap;
+ int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);
+
+ fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));
+
+ stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
+ bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);
+
+ for (j=0; j < h; ++j) {
+ for (i=0; i < w; ++i)
+ putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
+ putchar('\n');
+ }
+ return 0;
+}
+#endif
+//
+// Output:
+//
+// .ii.
+// @@@@@@.
+// V@Mio@@o
+// :i. V@V
+// :oM@@M
+// :@@@MM@M
+// @@o o@M
+// :@@. M@M
+// @@@o@@@@
+// :M@@V:@@.
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Complete program: print "Hello World!" banner, with bugs
+//
+#if 0
+char buffer[24<<20];
+unsigned char screen[20][79];
+
+int main(int arg, char **argv)
+{
+ stbtt_fontinfo font;
+ int i,j,ascent,baseline,ch=0;
+ float scale, xpos=2; // leave a little padding in case the character extends left
+ char *text = "Heljo World!"; // intentionally misspelled to show 'lj' brokenness
+
+ fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
+ stbtt_InitFont(&font, buffer, 0);
+
+ scale = stbtt_ScaleForPixelHeight(&font, 15);
+ stbtt_GetFontVMetrics(&font, &ascent,0,0);
+ baseline = (int) (ascent*scale);
+
+ while (text[ch]) {
+ int advance,lsb,x0,y0,x1,y1;
+ float x_shift = xpos - (float) floor(xpos);
+ stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
+ stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
+ stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
+ // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
+ // because this API is really for baking character bitmaps into textures. if you want to render
+ // a sequence of characters, you really need to render each bitmap to a temp buffer, then
+ // "alpha blend" that into the working buffer
+ xpos += (advance * scale);
+ if (text[ch+1])
+ xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
+ ++ch;
+ }
+
+ for (j=0; j < 20; ++j) {
+ for (i=0; i < 78; ++i)
+ putchar(" .:ioVM@"[screen[j][i]>>5]);
+ putchar('\n');
+ }
+
+ return 0;
+}
+#endif
+
+
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+////
+//// INTEGRATION WITH YOUR CODEBASE
+////
+//// The following sections allow you to supply alternate definitions
+//// of C library functions used by stb_truetype.
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+ // #define your own (u)stbtt_int8/16/32 before including to override this
+ #ifndef stbtt_uint8
+ typedef unsigned char stbtt_uint8;
+ typedef signed char stbtt_int8;
+ typedef unsigned short stbtt_uint16;
+ typedef signed short stbtt_int16;
+ typedef unsigned int stbtt_uint32;
+ typedef signed int stbtt_int32;
+ #endif
+
+ typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
+ typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
+
+ // #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
+ #ifndef STBTT_ifloor
+ #include <math.h>
+ #define STBTT_ifloor(x) ((int) floor(x))
+ #define STBTT_iceil(x) ((int) ceil(x))
+ #endif
+
+ #ifndef STBTT_sqrt
+ #include <math.h>
+ #define STBTT_sqrt(x) sqrt(x)
+ #endif
+
+ // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
+ #ifndef STBTT_malloc
+ #include <stdlib.h>
+ #define STBTT_malloc(x,u) ((void)(u),malloc(x))
+ #define STBTT_free(x,u) ((void)(u),free(x))
+ #endif
+
+ #ifndef STBTT_assert
+ #include <assert.h>
+ #define STBTT_assert(x) assert(x)
+ #endif
+
+ #ifndef STBTT_strlen
+ #include <string.h>
+ #define STBTT_strlen(x) strlen(x)
+ #endif
+
+ #ifndef STBTT_memcpy
+ #include <memory.h>
+ #define STBTT_memcpy memcpy
+ #define STBTT_memset memset
+ #endif
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+////
+//// INTERFACE
+////
+////
+
+#ifndef __STB_INCLUDE_STB_TRUETYPE_H__
+#define __STB_INCLUDE_STB_TRUETYPE_H__
+
+#ifdef STBTT_STATIC
+#define STBTT_DEF static
+#else
+#define STBTT_DEF extern
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// TEXTURE BAKING API
+//
+// If you use this API, you only have to call two functions ever.
+//
+
+typedef struct
+{
+ unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
+ float xoff,yoff,xadvance;
+} stbtt_bakedchar;
+
+STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf)
+ float pixel_height, // height of font in pixels
+ unsigned char *pixels, int pw, int ph, // bitmap to be filled in
+ int first_char, int num_chars, // characters to bake
+ stbtt_bakedchar *chardata); // you allocate this, it's num_chars long
+// if return is positive, the first unused row of the bitmap
+// if return is negative, returns the negative of the number of characters that fit
+// if return is 0, no characters fit and no rows were used
+// This uses a very crappy packing.
+
+typedef struct
+{
+ float x0,y0,s0,t0; // top-left
+ float x1,y1,s1,t1; // bottom-right
+} stbtt_aligned_quad;
+
+STBTT_DEF void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, // same data as above
+ int char_index, // character to display
+ float *xpos, float *ypos, // pointers to current position in screen pixel space
+ stbtt_aligned_quad *q, // output: quad to draw
+ int opengl_fillrule); // true if opengl fill rule; false if DX9 or earlier
+// Call GetBakedQuad with char_index = 'character - first_char', and it
+// creates the quad you need to draw and advances the current position.
+//
+// The coordinate system used assumes y increases downwards.
+//
+// Characters will extend both above and below the current position;
+// see discussion of "BASELINE" above.
+//
+// It's inefficient; you might want to c&p it and optimize it.
+
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// NEW TEXTURE BAKING API
+//
+// This provides options for packing multiple fonts into one atlas, not
+// perfectly but better than nothing.
+
+typedef struct
+{
+ unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
+ float xoff,yoff,xadvance;
+ float xoff2,yoff2;
+} stbtt_packedchar;
+
+typedef struct stbtt_pack_context stbtt_pack_context;
+typedef struct stbtt_fontinfo stbtt_fontinfo;
+#ifndef STB_RECT_PACK_VERSION
+typedef struct stbrp_rect stbrp_rect;
+#endif
+
+STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int width, int height, int stride_in_bytes, int padding, void *alloc_context);
+// Initializes a packing context stored in the passed-in stbtt_pack_context.
+// Future calls using this context will pack characters into the bitmap passed
+// in here: a 1-channel bitmap that is weight x height. stride_in_bytes is
+// the distance from one row to the next (or 0 to mean they are packed tightly
+// together). "padding" is the amount of padding to leave between each
+// character (normally you want '1' for bitmaps you'll use as textures with
+// bilinear filtering).
+//
+// Returns 0 on failure, 1 on success.
+
+STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc);
+// Cleans up the packing context and frees all memory.
+
+#define STBTT_POINT_SIZE(x) (-(x))
+
+STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, float font_size,
+ int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range);
+// Creates character bitmaps from the font_index'th font found in fontdata (use
+// font_index=0 if you don't know what that is). It creates num_chars_in_range
+// bitmaps for characters with unicode values starting at first_unicode_char_in_range
+// and increasing. Data for how to render them is stored in chardata_for_range;
+// pass these to stbtt_GetPackedQuad to get back renderable quads.
+//
+// font_size is the full height of the character from ascender to descender,
+// as computed by stbtt_ScaleForPixelHeight. To use a point size as computed
+// by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE()
+// and pass that result as 'font_size':
+// ..., 20 , ... // font max minus min y is 20 pixels tall
+// ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall
+
+typedef struct
+{
+ float font_size;
+ int first_unicode_codepoint_in_range; // if non-zero, then the chars are continuous, and this is the first codepoint
+ int *array_of_unicode_codepoints; // if non-zero, then this is an array of unicode codepoints
+ int num_chars;
+ stbtt_packedchar *chardata_for_range; // output
+ unsigned char h_oversample, v_oversample; // don't set these, they're used internally
+} stbtt_pack_range;
+
+STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges);
+// Creates character bitmaps from multiple ranges of characters stored in
+// ranges. This will usually create a better-packed bitmap than multiple
+// calls to stbtt_PackFontRange. Note that you can call this multiple
+// times within a single PackBegin/PackEnd.
+
+STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample);
+// Oversampling a font increases the quality by allowing higher-quality subpixel
+// positioning, and is especially valuable at smaller text sizes.
+//
+// This function sets the amount of oversampling for all following calls to
+// stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given
+// pack context. The default (no oversampling) is achieved by h_oversample=1
+// and v_oversample=1. The total number of pixels required is
+// h_oversample*v_oversample larger than the default; for example, 2x2
+// oversampling requires 4x the storage of 1x1. For best results, render
+// oversampled textures with bilinear filtering. Look at the readme in
+// stb/tests/oversample for information about oversampled fonts
+//
+// To use with PackFontRangesGather etc., you must set it before calls
+// call to PackFontRangesGatherRects.
+
+STBTT_DEF void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph, // same data as above
+ int char_index, // character to display
+ float *xpos, float *ypos, // pointers to current position in screen pixel space
+ stbtt_aligned_quad *q, // output: quad to draw
+ int align_to_integer);
+
+STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
+STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects);
+STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
+// Calling these functions in sequence is roughly equivalent to calling
+// stbtt_PackFontRanges(). If you more control over the packing of multiple
+// fonts, or if you want to pack custom data into a font texture, take a look
+// at the source to of stbtt_PackFontRanges() and create a custom version
+// using these functions, e.g. call GatherRects multiple times,
+// building up a single array of rects, then call PackRects once,
+// then call RenderIntoRects repeatedly. This may result in a
+// better packing than calling PackFontRanges multiple times
+// (or it may not).
+
+// this is an opaque structure that you shouldn't mess with which holds
+// all the context needed from PackBegin to PackEnd.
+struct stbtt_pack_context {
+ void *user_allocator_context;
+ void *pack_info;
+ int width;
+ int height;
+ int stride_in_bytes;
+ int padding;
+ unsigned int h_oversample, v_oversample;
+ unsigned char *pixels;
+ void *nodes;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// FONT LOADING
+//
+//
+
+STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
+// Each .ttf/.ttc file may have more than one font. Each font has a sequential
+// index number starting from 0. Call this function to get the font offset for
+// a given index; it returns -1 if the index is out of range. A regular .ttf
+// file will only define one font and it always be at offset 0, so it will
+// return '0' for index 0, and -1 for all other indices. You can just skip
+// this step if you know it's that kind of font.
+
+
+// The following structure is defined publically so you can declare one on
+// the stack or as a global or etc, but you should treat it as opaque.
+typedef struct stbtt_fontinfo
+{
+ void * userdata;
+ unsigned char * data; // pointer to .ttf file
+ int fontstart; // offset of start of font
+
+ int numGlyphs; // number of glyphs, needed for range checking
+
+ int loca,head,glyf,hhea,hmtx,kern; // table locations as offset from start of .ttf
+ int index_map; // a cmap mapping for our chosen character encoding
+ int indexToLocFormat; // format needed to map from glyph index to glyph
+} stbtt_fontinfo;
+
+STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
+// Given an offset into the file that defines a font, this function builds
+// the necessary cached info for the rest of the system. You must allocate
+// the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't
+// need to do anything special to free it, because the contents are pure
+// value data with no additional data structures. Returns 0 on failure.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// CHARACTER TO GLYPH-INDEX CONVERSIOn
+
+STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
+// If you're going to perform multiple operations on the same character
+// and you want a speed-up, call this function with the character you're
+// going to process, then use glyph-based functions instead of the
+// codepoint-based functions.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// CHARACTER PROPERTIES
+//
+
+STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels);
+// computes a scale factor to produce a font whose "height" is 'pixels' tall.
+// Height is measured as the distance from the highest ascender to the lowest
+// descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics
+// and computing:
+// scale = pixels / (ascent - descent)
+// so if you prefer to measure height by the ascent only, use a similar calculation.
+
+STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels);
+// computes a scale factor to produce a font whose EM size is mapped to
+// 'pixels' tall. This is probably what traditional APIs compute, but
+// I'm not positive.
+
+STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap);
+// ascent is the coordinate above the baseline the font extends; descent
+// is the coordinate below the baseline the font extends (i.e. it is typically negative)
+// lineGap is the spacing between one row's descent and the next row's ascent...
+// so you should advance the vertical position by "*ascent - *descent + *lineGap"
+// these are expressed in unscaled coordinates, so you must multiply by
+// the scale factor for a given size
+
+STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
+// the bounding box around all possible characters
+
+STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing);
+// leftSideBearing is the offset from the current horizontal position to the left edge of the character
+// advanceWidth is the offset from the current horizontal position to the next horizontal position
+// these are expressed in unscaled coordinates
+
+STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
+// an additional amount to add to the 'advance' value between ch1 and ch2
+
+STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
+// Gets the bounding box of the visible part of the glyph, in unscaled coordinates
+
+STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
+STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
+STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
+// as above, but takes one or more glyph indices for greater efficiency
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// GLYPH SHAPES (you probably don't need these, but they have to go before
+// the bitmaps for C declaration-order reasons)
+//
+
+#ifndef STBTT_vmove // you can predefine these to use different values (but why?)
+ enum {
+ STBTT_vmove=1,
+ STBTT_vline,
+ STBTT_vcurve
+ };
+#endif
+
+#ifndef stbtt_vertex // you can predefine this to use different values
+ // (we share this with other code at RAD)
+ #define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file
+ typedef struct
+ {
+ stbtt_vertex_type x,y,cx,cy;
+ unsigned char type,padding;
+ } stbtt_vertex;
+#endif
+
+STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
+// returns non-zero if nothing is drawn for this glyph
+
+STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
+STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
+// returns # of vertices and fills *vertices with the pointer to them
+// these are expressed in "unscaled" coordinates
+//
+// The shape is a series of countours. Each one starts with
+// a STBTT_moveto, then consists of a series of mixed
+// STBTT_lineto and STBTT_curveto segments. A lineto
+// draws a line from previous endpoint to its x,y; a curveto
+// draws a quadratic bezier from previous endpoint to
+// its x,y, using cx,cy as the bezier control point.
+
+STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
+// frees the data allocated above
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// BITMAP RENDERING
+//
+
+STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
+// frees the bitmap allocated below
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
+// allocates a large-enough single-channel 8bpp bitmap and renders the
+// specified character/glyph at the specified scale into it, with
+// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
+// *width & *height are filled out with the width & height of the bitmap,
+// which is stored left-to-right, top-to-bottom.
+//
+// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
+// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
+// shift for the character
+
+STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint);
+// the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap
+// in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap
+// is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the
+// width and height and positioning info for it first.
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint);
+// same as stbtt_MakeCodepointBitmap, but you can specify a subpixel
+// shift for the character
+
+STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
+// get the bbox of the bitmap centered around the glyph origin; so the
+// bitmap width is ix1-ix0, height is iy1-iy0, and location to place
+// the bitmap top left is (leftSideBearing*scale,iy0).
+// (Note that the bitmap uses y-increases-down, but the shape uses
+// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)
+
+STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
+// same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel
+// shift for the character
+
+// the following functions are equivalent to the above functions, but operate
+// on glyph indices instead of Unicode codepoints (for efficiency)
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff);
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff);
+STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph);
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph);
+STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
+STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
+
+
+// @TODO: don't expose this structure
+typedef struct
+{
+ int w,h,stride;
+ unsigned char *pixels;
+} stbtt__bitmap;
+
+// rasterize a shape with quadratic beziers into a bitmap
+STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, // 1-channel bitmap to draw into
+ float flatness_in_pixels, // allowable error of curve in pixels
+ stbtt_vertex *vertices, // array of vertices defining shape
+ int num_verts, // number of vertices in above array
+ float scale_x, float scale_y, // scale applied to input vertices
+ float shift_x, float shift_y, // translation applied to input vertices
+ int x_off, int y_off, // another translation applied to input
+ int invert, // if non-zero, vertically flip shape
+ void *userdata); // context for to STBTT_MALLOC
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Finding the right font...
+//
+// You should really just solve this offline, keep your own tables
+// of what font is what, and don't try to get it out of the .ttf file.
+// That's because getting it out of the .ttf file is really hard, because
+// the names in the file can appear in many possible encodings, in many
+// possible languages, and e.g. if you need a case-insensitive comparison,
+// the details of that depend on the encoding & language in a complex way
+// (actually underspecified in truetype, but also gigantic).
+//
+// But you can use the provided functions in two possible ways:
+// stbtt_FindMatchingFont() will use *case-sensitive* comparisons on
+// unicode-encoded names to try to find the font you want;
+// you can run this before calling stbtt_InitFont()
+//
+// stbtt_GetFontNameString() lets you get any of the various strings
+// from the file yourself and do your own comparisons on them.
+// You have to have called stbtt_InitFont() first.
+
+
+STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags);
+// returns the offset (not index) of the font that matches, or -1 if none
+// if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold".
+// if you use any other flag, use a font name like "Arial"; this checks
+// the 'macStyle' header field; i don't know if fonts set this consistently
+#define STBTT_MACSTYLE_DONTCARE 0
+#define STBTT_MACSTYLE_BOLD 1
+#define STBTT_MACSTYLE_ITALIC 2
+#define STBTT_MACSTYLE_UNDERSCORE 4
+#define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us check the bitfield is 0
+
+STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2);
+// returns 1/0 whether the first string interpreted as utf8 is identical to
+// the second string interpreted as big-endian utf16... useful for strings from next func
+
+STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID);
+// returns the string (which may be big-endian double byte, e.g. for unicode)
+// and puts the length in bytes in *length.
+//
+// some of the values for the IDs are below; for more see the truetype spec:
+// http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
+// http://www.microsoft.com/typography/otspec/name.htm
+
+enum { // platformID
+ STBTT_PLATFORM_ID_UNICODE =0,
+ STBTT_PLATFORM_ID_MAC =1,
+ STBTT_PLATFORM_ID_ISO =2,
+ STBTT_PLATFORM_ID_MICROSOFT =3
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_UNICODE
+ STBTT_UNICODE_EID_UNICODE_1_0 =0,
+ STBTT_UNICODE_EID_UNICODE_1_1 =1,
+ STBTT_UNICODE_EID_ISO_10646 =2,
+ STBTT_UNICODE_EID_UNICODE_2_0_BMP=3,
+ STBTT_UNICODE_EID_UNICODE_2_0_FULL=4
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT
+ STBTT_MS_EID_SYMBOL =0,
+ STBTT_MS_EID_UNICODE_BMP =1,
+ STBTT_MS_EID_SHIFTJIS =2,
+ STBTT_MS_EID_UNICODE_FULL =10
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes
+ STBTT_MAC_EID_ROMAN =0, STBTT_MAC_EID_ARABIC =4,
+ STBTT_MAC_EID_JAPANESE =1, STBTT_MAC_EID_HEBREW =5,
+ STBTT_MAC_EID_CHINESE_TRAD =2, STBTT_MAC_EID_GREEK =6,
+ STBTT_MAC_EID_KOREAN =3, STBTT_MAC_EID_RUSSIAN =7
+};
+
+enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID...
+ // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs
+ STBTT_MS_LANG_ENGLISH =0x0409, STBTT_MS_LANG_ITALIAN =0x0410,
+ STBTT_MS_LANG_CHINESE =0x0804, STBTT_MS_LANG_JAPANESE =0x0411,
+ STBTT_MS_LANG_DUTCH =0x0413, STBTT_MS_LANG_KOREAN =0x0412,
+ STBTT_MS_LANG_FRENCH =0x040c, STBTT_MS_LANG_RUSSIAN =0x0419,
+ STBTT_MS_LANG_GERMAN =0x0407, STBTT_MS_LANG_SPANISH =0x0409,
+ STBTT_MS_LANG_HEBREW =0x040d, STBTT_MS_LANG_SWEDISH =0x041D
+};
+
+enum { // languageID for STBTT_PLATFORM_ID_MAC
+ STBTT_MAC_LANG_ENGLISH =0 , STBTT_MAC_LANG_JAPANESE =11,
+ STBTT_MAC_LANG_ARABIC =12, STBTT_MAC_LANG_KOREAN =23,
+ STBTT_MAC_LANG_DUTCH =4 , STBTT_MAC_LANG_RUSSIAN =32,
+ STBTT_MAC_LANG_FRENCH =1 , STBTT_MAC_LANG_SPANISH =6 ,
+ STBTT_MAC_LANG_GERMAN =2 , STBTT_MAC_LANG_SWEDISH =5 ,
+ STBTT_MAC_LANG_HEBREW =10, STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33,
+ STBTT_MAC_LANG_ITALIAN =3 , STBTT_MAC_LANG_CHINESE_TRAD =19
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __STB_INCLUDE_STB_TRUETYPE_H__
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+////
+//// IMPLEMENTATION
+////
+////
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+
+#ifndef STBTT_MAX_OVERSAMPLE
+#define STBTT_MAX_OVERSAMPLE 8
+#endif
+
+#if STBTT_MAX_OVERSAMPLE > 255
+#error "STBTT_MAX_OVERSAMPLE cannot be > 255"
+#endif
+
+typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1];
+
+#ifndef STBTT_RASTERIZER_VERSION
+#define STBTT_RASTERIZER_VERSION 2
+#endif
+
+//////////////////////////////////////////////////////////////////////////
+//
+// accessors to parse data from file
+//
+
+// on platforms that don't allow misaligned reads, if we want to allow
+// truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE
+
+#define ttBYTE(p) (* (stbtt_uint8 *) (p))
+#define ttCHAR(p) (* (stbtt_int8 *) (p))
+#define ttFixed(p) ttLONG(p)
+
+#if defined(STB_TRUETYPE_BIGENDIAN) && !defined(ALLOW_UNALIGNED_TRUETYPE)
+
+ #define ttUSHORT(p) (* (stbtt_uint16 *) (p))
+ #define ttSHORT(p) (* (stbtt_int16 *) (p))
+ #define ttULONG(p) (* (stbtt_uint32 *) (p))
+ #define ttLONG(p) (* (stbtt_int32 *) (p))
+
+#else
+
+ static stbtt_uint16 ttUSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
+ static stbtt_int16 ttSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
+ static stbtt_uint32 ttULONG(const stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
+ static stbtt_int32 ttLONG(const stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
+
+#endif
+
+#define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
+#define stbtt_tag(p,str) stbtt_tag4(p,str[0],str[1],str[2],str[3])
+
+static int stbtt__isfont(const stbtt_uint8 *font)
+{
+ // check the version number
+ if (stbtt_tag4(font, '1',0,0,0)) return 1; // TrueType 1
+ if (stbtt_tag(font, "typ1")) return 1; // TrueType with type 1 font -- we don't support this!
+ if (stbtt_tag(font, "OTTO")) return 1; // OpenType with CFF
+ if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0
+ return 0;
+}
+
+// @OPTIMIZE: binary search
+static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag)
+{
+ stbtt_int32 num_tables = ttUSHORT(data+fontstart+4);
+ stbtt_uint32 tabledir = fontstart + 12;
+ stbtt_int32 i;
+ for (i=0; i < num_tables; ++i) {
+ stbtt_uint32 loc = tabledir + 16*i;
+ if (stbtt_tag(data+loc+0, tag))
+ return ttULONG(data+loc+8);
+ }
+ return 0;
+}
+
+STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *font_collection, int index)
+{
+ // if it's just a font, there's only one valid index
+ if (stbtt__isfont(font_collection))
+ return index == 0 ? 0 : -1;
+
+ // check if it's a TTC
+ if (stbtt_tag(font_collection, "ttcf")) {
+ // version 1?
+ if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
+ stbtt_int32 n = ttLONG(font_collection+8);
+ if (index >= n)
+ return -1;
+ return ttULONG(font_collection+12+index*4);
+ }
+ }
+ return -1;
+}
+
+STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data2, int fontstart)
+{
+ stbtt_uint8 *data = (stbtt_uint8 *) data2;
+ stbtt_uint32 cmap, t;
+ stbtt_int32 i,numTables;
+
+ info->data = data;
+ info->fontstart = fontstart;
+
+ cmap = stbtt__find_table(data, fontstart, "cmap"); // required
+ info->loca = stbtt__find_table(data, fontstart, "loca"); // required
+ info->head = stbtt__find_table(data, fontstart, "head"); // required
+ info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required
+ info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
+ info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
+ info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
+ if (!cmap || !info->loca || !info->head || !info->glyf || !info->hhea || !info->hmtx)
+ return 0;
+
+ t = stbtt__find_table(data, fontstart, "maxp");
+ if (t)
+ info->numGlyphs = ttUSHORT(data+t+4);
+ else
+ info->numGlyphs = 0xffff;
+
+ // find a cmap encoding table we understand *now* to avoid searching
+ // later. (todo: could make this installable)
+ // the same regardless of glyph.
+ numTables = ttUSHORT(data + cmap + 2);
+ info->index_map = 0;
+ for (i=0; i < numTables; ++i) {
+ stbtt_uint32 encoding_record = cmap + 4 + 8 * i;
+ // find an encoding we understand:
+ switch(ttUSHORT(data+encoding_record)) {
+ case STBTT_PLATFORM_ID_MICROSOFT:
+ switch (ttUSHORT(data+encoding_record+2)) {
+ case STBTT_MS_EID_UNICODE_BMP:
+ case STBTT_MS_EID_UNICODE_FULL:
+ // MS/Unicode
+ info->index_map = cmap + ttULONG(data+encoding_record+4);
+ break;
+ }
+ break;
+ case STBTT_PLATFORM_ID_UNICODE:
+ // Mac/iOS has these
+ // all the encodingIDs are unicode, so we don't bother to check it
+ info->index_map = cmap + ttULONG(data+encoding_record+4);
+ break;
+ }
+ }
+ if (info->index_map == 0)
+ return 0;
+
+ info->indexToLocFormat = ttUSHORT(data+info->head + 50);
+ return 1;
+}
+
+STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
+{
+ stbtt_uint8 *data = info->data;
+ stbtt_uint32 index_map = info->index_map;
+
+ stbtt_uint16 format = ttUSHORT(data + index_map + 0);
+ if (format == 0) { // apple byte encoding
+ stbtt_int32 bytes = ttUSHORT(data + index_map + 2);
+ if (unicode_codepoint < bytes-6)
+ return ttBYTE(data + index_map + 6 + unicode_codepoint);
+ return 0;
+ } else if (format == 6) {
+ stbtt_uint32 first = ttUSHORT(data + index_map + 6);
+ stbtt_uint32 count = ttUSHORT(data + index_map + 8);
+ if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count)
+ return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2);
+ return 0;
+ } else if (format == 2) {
+ STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean
+ return 0;
+ } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges
+ stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1;
+ stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1;
+ stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10);
+ stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1;
+
+ // do a binary search of the segments
+ stbtt_uint32 endCount = index_map + 14;
+ stbtt_uint32 search = endCount;
+
+ if (unicode_codepoint > 0xffff)
+ return 0;
+
+ // they lie from endCount .. endCount + segCount
+ // but searchRange is the nearest power of two, so...
+ if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2))
+ search += rangeShift*2;
+
+ // now decrement to bias correctly to find smallest
+ search -= 2;
+ while (entrySelector) {
+ stbtt_uint16 end;
+ searchRange >>= 1;
+ end = ttUSHORT(data + search + searchRange*2);
+ if (unicode_codepoint > end)
+ search += searchRange*2;
+ --entrySelector;
+ }
+ search += 2;
+
+ {
+ stbtt_uint16 offset, start;
+ stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1);
+
+ STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
+ start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
+ if (unicode_codepoint < start)
+ return 0;
+
+ offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
+ if (offset == 0)
+ return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));
+
+ return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
+ }
+ } else if (format == 12 || format == 13) {
+ stbtt_uint32 ngroups = ttULONG(data+index_map+12);
+ stbtt_int32 low,high;
+ low = 0; high = (stbtt_int32)ngroups;
+ // Binary search the right group.
+ while (low < high) {
+ stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high
+ stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12);
+ stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4);
+ if ((stbtt_uint32) unicode_codepoint < start_char)
+ high = mid;
+ else if ((stbtt_uint32) unicode_codepoint > end_char)
+ low = mid+1;
+ else {
+ stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8);
+ if (format == 12)
+ return start_glyph + unicode_codepoint-start_char;
+ else // format == 13
+ return start_glyph;
+ }
+ }
+ return 0; // not found
+ }
+ // @TODO
+ STBTT_assert(0);
+ return 0;
+}
+
+STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices)
+{
+ return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices);
+}
+
+static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy)
+{
+ v->type = type;
+ v->x = (stbtt_int16) x;
+ v->y = (stbtt_int16) y;
+ v->cx = (stbtt_int16) cx;
+ v->cy = (stbtt_int16) cy;
+}
+
+static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index)
+{
+ int g1,g2;
+
+ if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range
+ if (info->indexToLocFormat >= 2) return -1; // unknown index->glyph map format
+
+ if (info->indexToLocFormat == 0) {
+ g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
+ g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
+ } else {
+ g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4);
+ g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4);
+ }
+
+ return g1==g2 ? -1 : g1; // if length is 0, return -1
+}
+
+STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
+{
+ int g = stbtt__GetGlyfOffset(info, glyph_index);
+ if (g < 0) return 0;
+
+ if (x0) *x0 = ttSHORT(info->data + g + 2);
+ if (y0) *y0 = ttSHORT(info->data + g + 4);
+ if (x1) *x1 = ttSHORT(info->data + g + 6);
+ if (y1) *y1 = ttSHORT(info->data + g + 8);
+ return 1;
+}
+
+STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1)
+{
+ return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1);
+}
+
+STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
+{
+ stbtt_int16 numberOfContours;
+ int g = stbtt__GetGlyfOffset(info, glyph_index);
+ if (g < 0) return 1;
+ numberOfContours = ttSHORT(info->data + g);
+ return numberOfContours == 0;
+}
+
+static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off,
+ stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy)
+{
+ if (start_off) {
+ if (was_off)
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy);
+ } else {
+ if (was_off)
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy);
+ else
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0);
+ }
+ return num_vertices;
+}
+
+STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
+{
+ stbtt_int16 numberOfContours;
+ stbtt_uint8 *endPtsOfContours;
+ stbtt_uint8 *data = info->data;
+ stbtt_vertex *vertices=0;
+ int num_vertices=0;
+ int g = stbtt__GetGlyfOffset(info, glyph_index);
+
+ *pvertices = NULL;
+
+ if (g < 0) return 0;
+
+ numberOfContours = ttSHORT(data + g);
+
+ if (numberOfContours > 0) {
+ stbtt_uint8 flags=0,flagcount;
+ stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
+ stbtt_int32 x,y,cx,cy,sx,sy, scx,scy;
+ stbtt_uint8 *points;
+ endPtsOfContours = (data + g + 10);
+ ins = ttUSHORT(data + g + 10 + numberOfContours * 2);
+ points = data + g + 10 + numberOfContours * 2 + 2 + ins;
+
+ n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);
+
+ m = n + 2*numberOfContours; // a loose bound on how many vertices we might need
+ vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
+ if (vertices == 0)
+ return 0;
+
+ next_move = 0;
+ flagcount=0;
+
+ // in first pass, we load uninterpreted data into the allocated array
+ // above, shifted to the end of the array so we won't overwrite it when
+ // we create our final data starting from the front
+
+ off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated
+
+ // first load flags
+
+ for (i=0; i < n; ++i) {
+ if (flagcount == 0) {
+ flags = *points++;
+ if (flags & 8)
+ flagcount = *points++;
+ } else
+ --flagcount;
+ vertices[off+i].type = flags;
+ }
+
+ // now load x coordinates
+ x=0;
+ for (i=0; i < n; ++i) {
+ flags = vertices[off+i].type;
+ if (flags & 2) {
+ stbtt_int16 dx = *points++;
+ x += (flags & 16) ? dx : -dx; // ???
+ } else {
+ if (!(flags & 16)) {
+ x = x + (stbtt_int16) (points[0]*256 + points[1]);
+ points += 2;
+ }
+ }
+ vertices[off+i].x = (stbtt_int16) x;
+ }
+
+ // now load y coordinates
+ y=0;
+ for (i=0; i < n; ++i) {
+ flags = vertices[off+i].type;
+ if (flags & 4) {
+ stbtt_int16 dy = *points++;
+ y += (flags & 32) ? dy : -dy; // ???
+ } else {
+ if (!(flags & 32)) {
+ y = y + (stbtt_int16) (points[0]*256 + points[1]);
+ points += 2;
+ }
+ }
+ vertices[off+i].y = (stbtt_int16) y;
+ }
+
+ // now convert them to our format
+ num_vertices=0;
+ sx = sy = cx = cy = scx = scy = 0;
+ for (i=0; i < n; ++i) {
+ flags = vertices[off+i].type;
+ x = (stbtt_int16) vertices[off+i].x;
+ y = (stbtt_int16) vertices[off+i].y;
+
+ if (next_move == i) {
+ if (i != 0)
+ num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
+
+ // now start the new one
+ start_off = !(flags & 1);
+ if (start_off) {
+ // if we start off with an off-curve point, then when we need to find a point on the curve
+ // where we can start, and we need to save some state for when we wraparound.
+ scx = x;
+ scy = y;
+ if (!(vertices[off+i+1].type & 1)) {
+ // next point is also a curve point, so interpolate an on-point curve
+ sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1;
+ sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1;
+ } else {
+ // otherwise just use the next point as our start point
+ sx = (stbtt_int32) vertices[off+i+1].x;
+ sy = (stbtt_int32) vertices[off+i+1].y;
+ ++i; // we're using point i+1 as the starting point, so skip it
+ }
+ } else {
+ sx = x;
+ sy = y;
+ }
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0);
+ was_off = 0;
+ next_move = 1 + ttUSHORT(endPtsOfContours+j*2);
+ ++j;
+ } else {
+ if (!(flags & 1)) { // if it's a curve
+ if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
+ cx = x;
+ cy = y;
+ was_off = 1;
+ } else {
+ if (was_off)
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy);
+ else
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0);
+ was_off = 0;
+ }
+ }
+ }
+ num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
+ } else if (numberOfContours == -1) {
+ // Compound shapes.
+ int more = 1;
+ stbtt_uint8 *comp = data + g + 10;
+ num_vertices = 0;
+ vertices = 0;
+ while (more) {
+ stbtt_uint16 flags, gidx;
+ int comp_num_verts = 0, i;
+ stbtt_vertex *comp_verts = 0, *tmp = 0;
+ float mtx[6] = {1,0,0,1,0,0}, m, n;
+
+ flags = ttSHORT(comp); comp+=2;
+ gidx = ttSHORT(comp); comp+=2;
+
+ if (flags & 2) { // XY values
+ if (flags & 1) { // shorts
+ mtx[4] = ttSHORT(comp); comp+=2;
+ mtx[5] = ttSHORT(comp); comp+=2;
+ } else {
+ mtx[4] = ttCHAR(comp); comp+=1;
+ mtx[5] = ttCHAR(comp); comp+=1;
+ }
+ }
+ else {
+ // @TODO handle matching point
+ STBTT_assert(0);
+ }
+ if (flags & (1<<3)) { // WE_HAVE_A_SCALE
+ mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[1] = mtx[2] = 0;
+ } else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE
+ mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[1] = mtx[2] = 0;
+ mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+ } else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO
+ mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[1] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[2] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+ }
+
+ // Find transformation scales.
+ m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
+ n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);
+
+ // Get indexed glyph.
+ comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
+ if (comp_num_verts > 0) {
+ // Transform vertices.
+ for (i = 0; i < comp_num_verts; ++i) {
+ stbtt_vertex* v = &comp_verts[i];
+ stbtt_vertex_type x,y;
+ x=v->x; y=v->y;
+ v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
+ v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
+ x=v->cx; y=v->cy;
+ v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
+ v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
+ }
+ // Append vertices.
+ tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata);
+ if (!tmp) {
+ if (vertices) STBTT_free(vertices, info->userdata);
+ if (comp_verts) STBTT_free(comp_verts, info->userdata);
+ return 0;
+ }
+ if (num_vertices > 0) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
+ STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
+ if (vertices) STBTT_free(vertices, info->userdata);
+ vertices = tmp;
+ STBTT_free(comp_verts, info->userdata);
+ num_vertices += comp_num_verts;
+ }
+ // More components ?
+ more = flags & (1<<5);
+ }
+ } else if (numberOfContours < 0) {
+ // @TODO other compound variations?
+ STBTT_assert(0);
+ } else {
+ // numberOfCounters == 0, do nothing
+ }
+
+ *pvertices = vertices;
+ return num_vertices;
+}
+
+STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing)
+{
+ stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34);
+ if (glyph_index < numOfLongHorMetrics) {
+ if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*glyph_index);
+ if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
+ } else {
+ if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
+ if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
+ }
+}
+
+STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
+{
+ stbtt_uint8 *data = info->data + info->kern;
+ stbtt_uint32 needle, straw;
+ int l, r, m;
+
+ // we only look at the first table. it must be 'horizontal' and format 0.
+ if (!info->kern)
+ return 0;
+ if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
+ return 0;
+ if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
+ return 0;
+
+ l = 0;
+ r = ttUSHORT(data+10) - 1;
+ needle = glyph1 << 16 | glyph2;
+ while (l <= r) {
+ m = (l + r) >> 1;
+ straw = ttULONG(data+18+(m*6)); // note: unaligned read
+ if (needle < straw)
+ r = m - 1;
+ else if (needle > straw)
+ l = m + 1;
+ else
+ return ttSHORT(data+22+(m*6));
+ }
+ return 0;
+}
+
+STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
+{
+ if (!info->kern) // if no kerning table, don't waste time looking up both codepoint->glyphs
+ return 0;
+ return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2));
+}
+
+STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
+{
+ stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
+}
+
+STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap)
+{
+ if (ascent ) *ascent = ttSHORT(info->data+info->hhea + 4);
+ if (descent) *descent = ttSHORT(info->data+info->hhea + 6);
+ if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
+}
+
+STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1)
+{
+ *x0 = ttSHORT(info->data + info->head + 36);
+ *y0 = ttSHORT(info->data + info->head + 38);
+ *x1 = ttSHORT(info->data + info->head + 40);
+ *y1 = ttSHORT(info->data + info->head + 42);
+}
+
+STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height)
+{
+ int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6);
+ return (float) height / fheight;
+}
+
+STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
+{
+ int unitsPerEm = ttUSHORT(info->data + info->head + 18);
+ return pixels / unitsPerEm;
+}
+
+STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
+{
+ STBTT_free(v, info->userdata);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// antialiasing software rasterizer
+//
+
+STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+ int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning
+ if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
+ // e.g. space character
+ if (ix0) *ix0 = 0;
+ if (iy0) *iy0 = 0;
+ if (ix1) *ix1 = 0;
+ if (iy1) *iy1 = 0;
+ } else {
+ // move to integral bboxes (treating pixels as little squares, what pixels get touched)?
+ if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x);
+ if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y);
+ if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x);
+ if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y);
+ }
+}
+
+STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+ stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
+}
+
+STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+ stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1);
+}
+
+STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+ stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Rasterizer
+
+typedef struct stbtt__hheap_chunk
+{
+ struct stbtt__hheap_chunk *next;
+} stbtt__hheap_chunk;
+
+typedef struct stbtt__hheap
+{
+ struct stbtt__hheap_chunk *head;
+ void *first_free;
+ int num_remaining_in_head_chunk;
+} stbtt__hheap;
+
+static void *stbtt__hheap_alloc(stbtt__hheap *hh, size_t size, void *userdata)
+{
+ if (hh->first_free) {
+ void *p = hh->first_free;
+ hh->first_free = * (void **) p;
+ return p;
+ } else {
+ if (hh->num_remaining_in_head_chunk == 0) {
+ int count = (size < 32 ? 2000 : size < 128 ? 800 : 100);
+ stbtt__hheap_chunk *c = (stbtt__hheap_chunk *) STBTT_malloc(sizeof(stbtt__hheap_chunk) + size * count, userdata);
+ if (c == NULL)
+ return NULL;
+ c->next = hh->head;
+ hh->head = c;
+ hh->num_remaining_in_head_chunk = count;
+ }
+ --hh->num_remaining_in_head_chunk;
+ return (char *) (hh->head) + size * hh->num_remaining_in_head_chunk;
+ }
+}
+
+static void stbtt__hheap_free(stbtt__hheap *hh, void *p)
+{
+ *(void **) p = hh->first_free;
+ hh->first_free = p;
+}
+
+static void stbtt__hheap_cleanup(stbtt__hheap *hh, void *userdata)
+{
+ stbtt__hheap_chunk *c = hh->head;
+ while (c) {
+ stbtt__hheap_chunk *n = c->next;
+ STBTT_free(c, userdata);
+ c = n;
+ }
+}
+
+typedef struct stbtt__edge {
+ float x0,y0, x1,y1;
+ int invert;
+} stbtt__edge;
+
+
+typedef struct stbtt__active_edge
+{
+ struct stbtt__active_edge *next;
+ #if STBTT_RASTERIZER_VERSION==1
+ int x,dx;
+ float ey;
+ int direction;
+ #elif STBTT_RASTERIZER_VERSION==2
+ float fx,fdx,fdy;
+ float direction;
+ float sy;
+ float ey;
+ #else
+ #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+ #endif
+} stbtt__active_edge;
+
+#if STBTT_RASTERIZER_VERSION == 1
+#define STBTT_FIXSHIFT 10
+#define STBTT_FIX (1 << STBTT_FIXSHIFT)
+#define STBTT_FIXMASK (STBTT_FIX-1)
+
+static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
+{
+ stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
+ float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
+ STBTT_assert(z != NULL);
+ if (!z) return z;
+
+ // round dx down to avoid overshooting
+ if (dxdy < 0)
+ z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy);
+ else
+ z->dx = STBTT_ifloor(STBTT_FIX * dxdy);
+
+ z->x = STBTT_ifloor(STBTT_FIX * e->x0 + z->dx * (start_point - e->y0)); // use z->dx so when we offset later it's by the same amount
+ z->x -= off_x * STBTT_FIX;
+
+ z->ey = e->y1;
+ z->next = 0;
+ z->direction = e->invert ? 1 : -1;
+ return z;
+}
+#elif STBTT_RASTERIZER_VERSION == 2
+static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
+{
+ stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
+ float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
+ STBTT_assert(z != NULL);
+ //STBTT_assert(e->y0 <= start_point);
+ if (!z) return z;
+ z->fdx = dxdy;
+ z->fdy = dxdy != 0.0f ? (1.0f/dxdy) : 0.0f;
+ z->fx = e->x0 + dxdy * (start_point - e->y0);
+ z->fx -= off_x;
+ z->direction = e->invert ? 1.0f : -1.0f;
+ z->sy = e->y0;
+ z->ey = e->y1;
+ z->next = 0;
+ return z;
+}
+#else
+#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+#endif
+
+#if STBTT_RASTERIZER_VERSION == 1
+// note: this routine clips fills that extend off the edges... ideally this
+// wouldn't happen, but it could happen if the truetype glyph bounding boxes
+// are wrong, or if the user supplies a too-small bitmap
+static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight)
+{
+ // non-zero winding fill
+ int x0=0, w=0;
+
+ while (e) {
+ if (w == 0) {
+ // if we're currently at zero, we need to record the edge start point
+ x0 = e->x; w += e->direction;
+ } else {
+ int x1 = e->x; w += e->direction;
+ // if we went to zero, we need to draw
+ if (w == 0) {
+ int i = x0 >> STBTT_FIXSHIFT;
+ int j = x1 >> STBTT_FIXSHIFT;
+
+ if (i < len && j >= 0) {
+ if (i == j) {
+ // x0,x1 are the same pixel, so compute combined coverage
+ scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> STBTT_FIXSHIFT);
+ } else {
+ if (i >= 0) // add antialiasing for x0
+ scanline[i] = scanline[i] + (stbtt_uint8) (((STBTT_FIX - (x0 & STBTT_FIXMASK)) * max_weight) >> STBTT_FIXSHIFT);
+ else
+ i = -1; // clip
+
+ if (j < len) // add antialiasing for x1
+ scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & STBTT_FIXMASK) * max_weight) >> STBTT_FIXSHIFT);
+ else
+ j = len; // clip
+
+ for (++i; i < j; ++i) // fill pixels between x0 and x1
+ scanline[i] = scanline[i] + (stbtt_uint8) max_weight;
+ }
+ }
+ }
+ }
+
+ e = e->next;
+ }
+}
+
+static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
+{
+ stbtt__hheap hh = { 0, 0, 0 };
+ stbtt__active_edge *active = NULL;
+ int y,j=0;
+ int max_weight = (255 / vsubsample); // weight per vertical scanline
+ int s; // vertical subsample index
+ unsigned char scanline_data[512], *scanline;
+
+ if (result->w > 512)
+ scanline = (unsigned char *) STBTT_malloc(result->w, userdata);
+ else
+ scanline = scanline_data;
+
+ y = off_y * vsubsample;
+ e[n].y0 = (off_y + result->h) * (float) vsubsample + 1;
+
+ while (j < result->h) {
+ STBTT_memset(scanline, 0, result->w);
+ for (s=0; s < vsubsample; ++s) {
+ // find center of pixel for this scanline
+ float scan_y = y + 0.5f;
+ stbtt__active_edge **step = &active;
+
+ // update all active edges;
+ // remove all active edges that terminate before the center of this scanline
+ while (*step) {
+ stbtt__active_edge * z = *step;
+ if (z->ey <= scan_y) {
+ *step = z->next; // delete from list
+ STBTT_assert(z->direction);
+ z->direction = 0;
+ stbtt__hheap_free(&hh, z);
+ } else {
+ z->x += z->dx; // advance to position for current scanline
+ step = &((*step)->next); // advance through list
+ }
+ }
+
+ // resort the list if needed
+ for(;;) {
+ int changed=0;
+ step = &active;
+ while (*step && (*step)->next) {
+ if ((*step)->x > (*step)->next->x) {
+ stbtt__active_edge *t = *step;
+ stbtt__active_edge *q = t->next;
+
+ t->next = q->next;
+ q->next = t;
+ *step = q;
+ changed = 1;
+ }
+ step = &(*step)->next;
+ }
+ if (!changed) break;
+ }
+
+ // insert all edges that start before the center of this scanline -- omit ones that also end on this scanline
+ while (e->y0 <= scan_y) {
+ if (e->y1 > scan_y) {
+ stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata);
+ if (z != NULL) {
+ // find insertion point
+ if (active == NULL)
+ active = z;
+ else if (z->x < active->x) {
+ // insert at front
+ z->next = active;
+ active = z;
+ } else {
+ // find thing to insert AFTER
+ stbtt__active_edge *p = active;
+ while (p->next && p->next->x < z->x)
+ p = p->next;
+ // at this point, p->next->x is NOT < z->x
+ z->next = p->next;
+ p->next = z;
+ }
+ }
+ }
+ ++e;
+ }
+
+ // now process all active edges in XOR fashion
+ if (active)
+ stbtt__fill_active_edges(scanline, result->w, active, max_weight);
+
+ ++y;
+ }
+ STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w);
+ ++j;
+ }
+
+ stbtt__hheap_cleanup(&hh, userdata);
+
+ if (scanline != scanline_data)
+ STBTT_free(scanline, userdata);
+}
+
+#elif STBTT_RASTERIZER_VERSION == 2
+
+// the edge passed in here does not cross the vertical line at x or the vertical line at x+1
+// (i.e. it has already been clipped to those)
+static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edge *e, float x0, float y0, float x1, float y1)
+{
+ if (y0 == y1) return;
+ STBTT_assert(y0 < y1);
+ STBTT_assert(e->sy <= e->ey);
+ if (y0 > e->ey) return;
+ if (y1 < e->sy) return;
+ if (y0 < e->sy) {
+ x0 += (x1-x0) * (e->sy - y0) / (y1-y0);
+ y0 = e->sy;
+ }
+ if (y1 > e->ey) {
+ x1 += (x1-x0) * (e->ey - y1) / (y1-y0);
+ y1 = e->ey;
+ }
+
+ if (x0 == x)
+ STBTT_assert(x1 <= x+1);
+ else if (x0 == x+1)
+ STBTT_assert(x1 >= x);
+ else if (x0 <= x)
+ STBTT_assert(x1 <= x);
+ else if (x0 >= x+1)
+ STBTT_assert(x1 >= x+1);
+ else
+ STBTT_assert(x1 >= x && x1 <= x+1);
+
+ if (x0 <= x && x1 <= x)
+ scanline[x] += e->direction * (y1-y0);
+ else if (x0 >= x+1 && x1 >= x+1)
+ ;
+ else {
+ STBTT_assert(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1);
+ scanline[x] += e->direction * (y1-y0) * (1-((x0-x)+(x1-x))/2); // coverage = 1 - average x position
+ }
+}
+
+static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top)
+{
+ float y_bottom = y_top+1;
+
+ while (e) {
+ // brute force every pixel
+
+ // compute intersection points with top & bottom
+ STBTT_assert(e->ey >= y_top);
+
+ if (e->fdx == 0) {
+ float x0 = e->fx;
+ if (x0 < len) {
+ if (x0 >= 0) {
+ stbtt__handle_clipped_edge(scanline,(int) x0,e, x0,y_top, x0,y_bottom);
+ stbtt__handle_clipped_edge(scanline_fill-1,(int) x0+1,e, x0,y_top, x0,y_bottom);
+ } else {
+ stbtt__handle_clipped_edge(scanline_fill-1,0,e, x0,y_top, x0,y_bottom);
+ }
+ }
+ } else {
+ float x0 = e->fx;
+ float dx = e->fdx;
+ float xb = x0 + dx;
+ float x_top, x_bottom;
+ float sy0,sy1;
+ float dy = e->fdy;
+ STBTT_assert(e->sy <= y_bottom && e->ey >= y_top);
+
+ // compute endpoints of line segment clipped to this scanline (if the
+ // line segment starts on this scanline. x0 is the intersection of the
+ // line with y_top, but that may be off the line segment.
+ if (e->sy > y_top) {
+ x_top = x0 + dx * (e->sy - y_top);
+ sy0 = e->sy;
+ } else {
+ x_top = x0;
+ sy0 = y_top;
+ }
+ if (e->ey < y_bottom) {
+ x_bottom = x0 + dx * (e->ey - y_top);
+ sy1 = e->ey;
+ } else {
+ x_bottom = xb;
+ sy1 = y_bottom;
+ }
+
+ if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) {
+ // from here on, we don't have to range check x values
+
+ if ((int) x_top == (int) x_bottom) {
+ float height;
+ // simple case, only spans one pixel
+ int x = (int) x_top;
+ height = sy1 - sy0;
+ STBTT_assert(x >= 0 && x < len);
+ scanline[x] += e->direction * (1-((x_top - x) + (x_bottom-x))/2) * height;
+ scanline_fill[x] += e->direction * height; // everything right of this pixel is filled
+ } else {
+ int x,x1,x2;
+ float y_crossing, step, sign, area;
+ // covers 2+ pixels
+ if (x_top > x_bottom) {
+ // flip scanline vertically; signed area is the same
+ float t;
+ sy0 = y_bottom - (sy0 - y_top);
+ sy1 = y_bottom - (sy1 - y_top);
+ t = sy0, sy0 = sy1, sy1 = t;
+ t = x_bottom, x_bottom = x_top, x_top = t;
+ dx = -dx;
+ dy = -dy;
+ t = x0, x0 = xb, xb = t;
+ }
+
+ x1 = (int) x_top;
+ x2 = (int) x_bottom;
+ // compute intersection with y axis at x1+1
+ y_crossing = (x1+1 - x0) * dy + y_top;
+
+ sign = e->direction;
+ // area of the rectangle covered from y0..y_crossing
+ area = sign * (y_crossing-sy0);
+ // area of the triangle (x_top,y0), (x+1,y0), (x+1,y_crossing)
+ scanline[x1] += area * (1-((x_top - x1)+(x1+1-x1))/2);
+
+ step = sign * dy;
+ for (x = x1+1; x < x2; ++x) {
+ scanline[x] += area + step/2;
+ area += step;
+ }
+ y_crossing += dy * (x2 - (x1+1));
+
+ STBTT_assert(fabs(area) <= 1.01f);
+
+ scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (sy1-y_crossing);
+
+ scanline_fill[x2] += sign * (sy1-sy0);
+ }
+ } else {
+ // if edge goes outside of box we're drawing, we require
+ // clipping logic. since this does not match the intended use
+ // of this library, we use a different, very slow brute
+ // force implementation
+ int x;
+ for (x=0; x < len; ++x) {
+ // cases:
+ //
+ // there can be up to two intersections with the pixel. any intersection
+ // with left or right edges can be handled by splitting into two (or three)
+ // regions. intersections with top & bottom do not necessitate case-wise logic.
+ //
+ // the old way of doing this found the intersections with the left & right edges,
+ // then used some simple logic to produce up to three segments in sorted order
+ // from top-to-bottom. however, this had a problem: if an x edge was epsilon
+ // across the x border, then the corresponding y position might not be distinct
+ // from the other y segment, and it might ignored as an empty segment. to avoid
+ // that, we need to explicitly produce segments based on x positions.
+
+ // rename variables to clear pairs
+ float y0 = y_top;
+ float x1 = (float) (x);
+ float x2 = (float) (x+1);
+ float x3 = xb;
+ float y3 = y_bottom;
+ float y1,y2;
+
+ // x = e->x + e->dx * (y-y_top)
+ // (y-y_top) = (x - e->x) / e->dx
+ // y = (x - e->x) / e->dx + y_top
+ y1 = (x - x0) / dx + y_top;
+ y2 = (x+1 - x0) / dx + y_top;
+
+ if (x0 < x1 && x3 > x2) { // three segments descending down-right
+ stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
+ stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x2,y2);
+ stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
+ } else if (x3 < x1 && x0 > x2) { // three segments descending down-left
+ stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
+ stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x1,y1);
+ stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
+ } else if (x0 < x1 && x3 > x1) { // two segments across x, down-right
+ stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
+ stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
+ } else if (x3 < x1 && x0 > x1) { // two segments across x, down-left
+ stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
+ stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
+ } else if (x0 < x2 && x3 > x2) { // two segments across x+1, down-right
+ stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
+ stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
+ } else if (x3 < x2 && x0 > x2) { // two segments across x+1, down-left
+ stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
+ stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
+ } else { // one segment
+ stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x3,y3);
+ }
+ }
+ }
+ }
+ e = e->next;
+ }
+}
+
+// directly AA rasterize edges w/o supersampling
+static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
+{
+ stbtt__hheap hh = { 0, 0, 0 };
+ stbtt__active_edge *active = NULL;
+ int y,j=0, i;
+ float scanline_data[129], *scanline, *scanline2;
+
+ if (result->w > 64)
+ scanline = (float *) STBTT_malloc((result->w*2+1) * sizeof(float), userdata);
+ else
+ scanline = scanline_data;
+
+ scanline2 = scanline + result->w;
+
+ y = off_y;
+ e[n].y0 = (float) (off_y + result->h) + 1;
+
+ while (j < result->h) {
+ // find center of pixel for this scanline
+ float scan_y_top = y + 0.0f;
+ float scan_y_bottom = y + 1.0f;
+ stbtt__active_edge **step = &active;
+
+ STBTT_memset(scanline , 0, result->w*sizeof(scanline[0]));
+ STBTT_memset(scanline2, 0, (result->w+1)*sizeof(scanline[0]));
+
+ // update all active edges;
+ // remove all active edges that terminate before the top of this scanline
+ while (*step) {
+ stbtt__active_edge * z = *step;
+ if (z->ey <= scan_y_top) {
+ *step = z->next; // delete from list
+ STBTT_assert(z->direction);
+ z->direction = 0;
+ stbtt__hheap_free(&hh, z);
+ } else {
+ step = &((*step)->next); // advance through list
+ }
+ }
+
+ // insert all edges that start before the bottom of this scanline
+ while (e->y0 <= scan_y_bottom) {
+ if (e->y0 != e->y1) {
+ stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata);
+ if (z != NULL) {
+ STBTT_assert(z->ey >= scan_y_top);
+ // insert at front
+ z->next = active;
+ active = z;
+ }
+ }
+ ++e;
+ }
+
+ // now process all active edges
+ if (active)
+ stbtt__fill_active_edges_new(scanline, scanline2+1, result->w, active, scan_y_top);
+
+ {
+ float sum = 0;
+ for (i=0; i < result->w; ++i) {
+ float k;
+ int m;
+ sum += scanline2[i];
+ k = scanline[i] + sum;
+ k = (float) fabs(k)*255 + 0.5f;
+ m = (int) k;
+ if (m > 255) m = 255;
+ result->pixels[j*result->stride + i] = (unsigned char) m;
+ }
+ }
+ // advance all the edges
+ step = &active;
+ while (*step) {
+ stbtt__active_edge *z = *step;
+ z->fx += z->fdx; // advance to position for current scanline
+ step = &((*step)->next); // advance through list
+ }
+
+ ++y;
+ ++j;
+ }
+
+ stbtt__hheap_cleanup(&hh, userdata);
+
+ if (scanline != scanline_data)
+ STBTT_free(scanline, userdata);
+}
+#else
+#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+#endif
+
+#define STBTT__COMPARE(a,b) ((a)->y0 < (b)->y0)
+
+static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n)
+{
+ int i,j;
+ for (i=1; i < n; ++i) {
+ stbtt__edge t = p[i], *a = &t;
+ j = i;
+ while (j > 0) {
+ stbtt__edge *b = &p[j-1];
+ int c = STBTT__COMPARE(a,b);
+ if (!c) break;
+ p[j] = p[j-1];
+ --j;
+ }
+ if (i != j)
+ p[j] = t;
+ }
+}
+
+static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n)
+{
+ /* threshhold for transitioning to insertion sort */
+ while (n > 12) {
+ stbtt__edge t;
+ int c01,c12,c,m,i,j;
+
+ /* compute median of three */
+ m = n >> 1;
+ c01 = STBTT__COMPARE(&p[0],&p[m]);
+ c12 = STBTT__COMPARE(&p[m],&p[n-1]);
+ /* if 0 >= mid >= end, or 0 < mid < end, then use mid */
+ if (c01 != c12) {
+ /* otherwise, we'll need to swap something else to middle */
+ int z;
+ c = STBTT__COMPARE(&p[0],&p[n-1]);
+ /* 0>mid && mid<n: 0>n => n; 0<n => 0 */
+ /* 0<mid && mid>n: 0>n => 0; 0<n => n */
+ z = (c == c12) ? 0 : n-1;
+ t = p[z];
+ p[z] = p[m];
+ p[m] = t;
+ }
+ /* now p[m] is the median-of-three */
+ /* swap it to the beginning so it won't move around */
+ t = p[0];
+ p[0] = p[m];
+ p[m] = t;
+
+ /* partition loop */
+ i=1;
+ j=n-1;
+ for(;;) {
+ /* handling of equality is crucial here */
+ /* for sentinels & efficiency with duplicates */
+ for (;;++i) {
+ if (!STBTT__COMPARE(&p[i], &p[0])) break;
+ }
+ for (;;--j) {
+ if (!STBTT__COMPARE(&p[0], &p[j])) break;
+ }
+ /* make sure we haven't crossed */
+ if (i >= j) break;
+ t = p[i];
+ p[i] = p[j];
+ p[j] = t;
+
+ ++i;
+ --j;
+ }
+ /* recurse on smaller side, iterate on larger */
+ if (j < (n-i)) {
+ stbtt__sort_edges_quicksort(p,j);
+ p = p+i;
+ n = n-i;
+ } else {
+ stbtt__sort_edges_quicksort(p+i, n-i);
+ n = j;
+ }
+ }
+}
+
+static void stbtt__sort_edges(stbtt__edge *p, int n)
+{
+ stbtt__sort_edges_quicksort(p, n);
+ stbtt__sort_edges_ins_sort(p, n);
+}
+
+typedef struct
+{
+ float x,y;
+} stbtt__point;
+
+static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata)
+{
+ float y_scale_inv = invert ? -scale_y : scale_y;
+ stbtt__edge *e;
+ int n,i,j,k,m;
+#if STBTT_RASTERIZER_VERSION == 1
+ int vsubsample = result->h < 8 ? 15 : 5;
+#elif STBTT_RASTERIZER_VERSION == 2
+ int vsubsample = 1;
+#else
+ #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+#endif
+ // vsubsample should divide 255 evenly; otherwise we won't reach full opacity
+
+ // now we have to blow out the windings into explicit edge lists
+ n = 0;
+ for (i=0; i < windings; ++i)
+ n += wcount[i];
+
+ e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel
+ if (e == 0) return;
+ n = 0;
+
+ m=0;
+ for (i=0; i < windings; ++i) {
+ stbtt__point *p = pts + m;
+ m += wcount[i];
+ j = wcount[i]-1;
+ for (k=0; k < wcount[i]; j=k++) {
+ int a=k,b=j;
+ // skip the edge if horizontal
+ if (p[j].y == p[k].y)
+ continue;
+ // add edge from j to k to the list
+ e[n].invert = 0;
+ if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
+ e[n].invert = 1;
+ a=j,b=k;
+ }
+ e[n].x0 = p[a].x * scale_x + shift_x;
+ e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample;
+ e[n].x1 = p[b].x * scale_x + shift_x;
+ e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample;
+ ++n;
+ }
+ }
+
+ // now sort the edges by their highest point (should snap to integer, and then by x)
+ //STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare);
+ stbtt__sort_edges(e, n);
+
+ // now, traverse the scanlines and find the intersections on each scanline, use xor winding rule
+ stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata);
+
+ STBTT_free(e, userdata);
+}
+
+static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
+{
+ if (!points) return; // during first pass, it's unallocated
+ points[n].x = x;
+ points[n].y = y;
+}
+
+// tesselate until threshhold p is happy... @TODO warped to compensate for non-linear stretching
+static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
+{
+ // midpoint
+ float mx = (x0 + 2*x1 + x2)/4;
+ float my = (y0 + 2*y1 + y2)/4;
+ // versus directly drawn line
+ float dx = (x0+x2)/2 - mx;
+ float dy = (y0+y2)/2 - my;
+ if (n > 16) // 65536 segments on one curve better be enough!
+ return 1;
+ if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA
+ stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
+ stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
+ } else {
+ stbtt__add_point(points, *num_points,x2,y2);
+ *num_points = *num_points+1;
+ }
+ return 1;
+}
+
+// returns number of contours
+static stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata)
+{
+ stbtt__point *points=0;
+ int num_points=0;
+
+ float objspace_flatness_squared = objspace_flatness * objspace_flatness;
+ int i,n=0,start=0, pass;
+
+ // count how many "moves" there are to get the contour count
+ for (i=0; i < num_verts; ++i)
+ if (vertices[i].type == STBTT_vmove)
+ ++n;
+
+ *num_contours = n;
+ if (n == 0) return 0;
+
+ *contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata);
+
+ if (*contour_lengths == 0) {
+ *num_contours = 0;
+ return 0;
+ }
+
+ // make two passes through the points so we don't need to realloc
+ for (pass=0; pass < 2; ++pass) {
+ float x=0,y=0;
+ if (pass == 1) {
+ points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata);
+ if (points == NULL) goto error;
+ }
+ num_points = 0;
+ n= -1;
+ for (i=0; i < num_verts; ++i) {
+ switch (vertices[i].type) {
+ case STBTT_vmove:
+ // start the next contour
+ if (n >= 0)
+ (*contour_lengths)[n] = num_points - start;
+ ++n;
+ start = num_points;
+
+ x = vertices[i].x, y = vertices[i].y;
+ stbtt__add_point(points, num_points++, x,y);
+ break;
+ case STBTT_vline:
+ x = vertices[i].x, y = vertices[i].y;
+ stbtt__add_point(points, num_points++, x, y);
+ break;
+ case STBTT_vcurve:
+ stbtt__tesselate_curve(points, &num_points, x,y,
+ vertices[i].cx, vertices[i].cy,
+ vertices[i].x, vertices[i].y,
+ objspace_flatness_squared, 0);
+ x = vertices[i].x, y = vertices[i].y;
+ break;
+ }
+ }
+ (*contour_lengths)[n] = num_points - start;
+ }
+
+ return points;
+error:
+ STBTT_free(points, userdata);
+ STBTT_free(*contour_lengths, userdata);
+ *contour_lengths = 0;
+ *num_contours = 0;
+ return NULL;
+}
+
+STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata)
+{
+ float scale = scale_x > scale_y ? scale_y : scale_x;
+ int winding_count, *winding_lengths;
+ stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata);
+ if (windings) {
+ stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata);
+ STBTT_free(winding_lengths, userdata);
+ STBTT_free(windings, userdata);
+ }
+}
+
+STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
+{
+ STBTT_free(bitmap, userdata);
+}
+
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff)
+{
+ int ix0,iy0,ix1,iy1;
+ stbtt__bitmap gbm;
+ stbtt_vertex *vertices;
+ int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
+
+ if (scale_x == 0) scale_x = scale_y;
+ if (scale_y == 0) {
+ if (scale_x == 0) return NULL;
+ scale_y = scale_x;
+ }
+
+ stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1);
+
+ // now we get the size
+ gbm.w = (ix1 - ix0);
+ gbm.h = (iy1 - iy0);
+ gbm.pixels = NULL; // in case we error
+
+ if (width ) *width = gbm.w;
+ if (height) *height = gbm.h;
+ if (xoff ) *xoff = ix0;
+ if (yoff ) *yoff = iy0;
+
+ if (gbm.w && gbm.h) {
+ gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
+ if (gbm.pixels) {
+ gbm.stride = gbm.w;
+
+ stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata);
+ }
+ }
+ STBTT_free(vertices, info->userdata);
+ return gbm.pixels;
+}
+
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff)
+{
+ return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff);
+}
+
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph)
+{
+ int ix0,iy0;
+ stbtt_vertex *vertices;
+ int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
+ stbtt__bitmap gbm;
+
+ stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0);
+ gbm.pixels = output;
+ gbm.w = out_w;
+ gbm.h = out_h;
+ gbm.stride = out_stride;
+
+ if (gbm.w && gbm.h)
+ stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata);
+
+ STBTT_free(vertices, info->userdata);
+}
+
+STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph)
+{
+ stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph);
+}
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
+{
+ return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff);
+}
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint)
+{
+ stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint));
+}
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
+{
+ return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff);
+}
+
+STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint)
+{
+ stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// bitmap baking
+//
+// This is SUPER-CRAPPY packing to keep source code small
+
+STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf)
+ float pixel_height, // height of font in pixels
+ unsigned char *pixels, int pw, int ph, // bitmap to be filled in
+ int first_char, int num_chars, // characters to bake
+ stbtt_bakedchar *chardata)
+{
+ float scale;
+ int x,y,bottom_y, i;
+ stbtt_fontinfo f;
+ f.userdata = NULL;
+ if (!stbtt_InitFont(&f, data, offset))
+ return -1;
+ STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
+ x=y=1;
+ bottom_y = 1;
+
+ scale = stbtt_ScaleForPixelHeight(&f, pixel_height);
+
+ for (i=0; i < num_chars; ++i) {
+ int advance, lsb, x0,y0,x1,y1,gw,gh;
+ int g = stbtt_FindGlyphIndex(&f, first_char + i);
+ stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb);
+ stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1);
+ gw = x1-x0;
+ gh = y1-y0;
+ if (x + gw + 1 >= pw)
+ y = bottom_y, x = 1; // advance to next row
+ if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row
+ return -i;
+ STBTT_assert(x+gw < pw);
+ STBTT_assert(y+gh < ph);
+ stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g);
+ chardata[i].x0 = (stbtt_int16) x;
+ chardata[i].y0 = (stbtt_int16) y;
+ chardata[i].x1 = (stbtt_int16) (x + gw);
+ chardata[i].y1 = (stbtt_int16) (y + gh);
+ chardata[i].xadvance = scale * advance;
+ chardata[i].xoff = (float) x0;
+ chardata[i].yoff = (float) y0;
+ x = x + gw + 1;
+ if (y+gh+1 > bottom_y)
+ bottom_y = y+gh+1;
+ }
+ return bottom_y;
+}
+
+STBTT_DEF void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
+{
+ float d3d_bias = opengl_fillrule ? 0 : -0.5f;
+ float ipw = 1.0f / pw, iph = 1.0f / ph;
+ stbtt_bakedchar *b = chardata + char_index;
+ int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f);
+ int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f);
+
+ q->x0 = round_x + d3d_bias;
+ q->y0 = round_y + d3d_bias;
+ q->x1 = round_x + b->x1 - b->x0 + d3d_bias;
+ q->y1 = round_y + b->y1 - b->y0 + d3d_bias;
+
+ q->s0 = b->x0 * ipw;
+ q->t0 = b->y0 * iph;
+ q->s1 = b->x1 * ipw;
+ q->t1 = b->y1 * iph;
+
+ *xpos += b->xadvance;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// rectangle packing replacement routines if you don't have stb_rect_pack.h
+//
+
+#ifndef STB_RECT_PACK_VERSION
+#ifdef _MSC_VER
+#define STBTT__NOTUSED(v) (void)(v)
+#else
+#define STBTT__NOTUSED(v) (void)sizeof(v)
+#endif
+
+typedef int stbrp_coord;
+
+////////////////////////////////////////////////////////////////////////////////////
+// //
+// //
+// COMPILER WARNING ?!?!? //
+// //
+// //
+// if you get a compile warning due to these symbols being defined more than //
+// once, move #include "stb_rect_pack.h" before #include "stb_truetype.h" //
+// //
+////////////////////////////////////////////////////////////////////////////////////
+
+typedef struct
+{
+ int width,height;
+ int x,y,bottom_y;
+} stbrp_context;
+
+typedef struct
+{
+ unsigned char x;
+} stbrp_node;
+
+struct stbrp_rect
+{
+ stbrp_coord x,y;
+ int id,w,h,was_packed;
+};
+
+static void stbrp_init_target(stbrp_context *con, int pw, int ph, stbrp_node *nodes, int num_nodes)
+{
+ con->width = pw;
+ con->height = ph;
+ con->x = 0;
+ con->y = 0;
+ con->bottom_y = 0;
+ STBTT__NOTUSED(nodes);
+ STBTT__NOTUSED(num_nodes);
+}
+
+static void stbrp_pack_rects(stbrp_context *con, stbrp_rect *rects, int num_rects)
+{
+ int i;
+ for (i=0; i < num_rects; ++i) {
+ if (con->x + rects[i].w > con->width) {
+ con->x = 0;
+ con->y = con->bottom_y;
+ }
+ if (con->y + rects[i].h > con->height)
+ break;
+ rects[i].x = con->x;
+ rects[i].y = con->y;
+ rects[i].was_packed = 1;
+ con->x += rects[i].w;
+ if (con->y + rects[i].h > con->bottom_y)
+ con->bottom_y = con->y + rects[i].h;
+ }
+ for ( ; i < num_rects; ++i)
+ rects[i].was_packed = 0;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// bitmap baking
+//
+// This is SUPER-AWESOME (tm Ryan Gordon) packing using stb_rect_pack.h. If
+// stb_rect_pack.h isn't available, it uses the BakeFontBitmap strategy.
+
+STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int pw, int ph, int stride_in_bytes, int padding, void *alloc_context)
+{
+ stbrp_context *context = (stbrp_context *) STBTT_malloc(sizeof(*context) ,alloc_context);
+ int num_nodes = pw - padding;
+ stbrp_node *nodes = (stbrp_node *) STBTT_malloc(sizeof(*nodes ) * num_nodes,alloc_context);
+
+ if (context == NULL || nodes == NULL) {
+ if (context != NULL) STBTT_free(context, alloc_context);
+ if (nodes != NULL) STBTT_free(nodes , alloc_context);
+ return 0;
+ }
+
+ spc->user_allocator_context = alloc_context;
+ spc->width = pw;
+ spc->height = ph;
+ spc->pixels = pixels;
+ spc->pack_info = context;
+ spc->nodes = nodes;
+ spc->padding = padding;
+ spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw;
+ spc->h_oversample = 1;
+ spc->v_oversample = 1;
+
+ stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
+
+ if (pixels)
+ STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
+
+ return 1;
+}
+
+STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc)
+{
+ STBTT_free(spc->nodes , spc->user_allocator_context);
+ STBTT_free(spc->pack_info, spc->user_allocator_context);
+}
+
+STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample)
+{
+ STBTT_assert(h_oversample <= STBTT_MAX_OVERSAMPLE);
+ STBTT_assert(v_oversample <= STBTT_MAX_OVERSAMPLE);
+ if (h_oversample <= STBTT_MAX_OVERSAMPLE)
+ spc->h_oversample = h_oversample;
+ if (v_oversample <= STBTT_MAX_OVERSAMPLE)
+ spc->v_oversample = v_oversample;
+}
+
+#define STBTT__OVER_MASK (STBTT_MAX_OVERSAMPLE-1)
+
+static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
+{
+ unsigned char buffer[STBTT_MAX_OVERSAMPLE];
+ int safe_w = w - kernel_width;
+ int j;
+ STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
+ for (j=0; j < h; ++j) {
+ int i;
+ unsigned int total;
+ STBTT_memset(buffer, 0, kernel_width);
+
+ total = 0;
+
+ // make kernel_width a constant in common cases so compiler can optimize out the divide
+ switch (kernel_width) {
+ case 2:
+ for (i=0; i <= safe_w; ++i) {
+ total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+ pixels[i] = (unsigned char) (total / 2);
+ }
+ break;
+ case 3:
+ for (i=0; i <= safe_w; ++i) {
+ total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+ pixels[i] = (unsigned char) (total / 3);
+ }
+ break;
+ case 4:
+ for (i=0; i <= safe_w; ++i) {
+ total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+ pixels[i] = (unsigned char) (total / 4);
+ }
+ break;
+ case 5:
+ for (i=0; i <= safe_w; ++i) {
+ total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+ pixels[i] = (unsigned char) (total / 5);
+ }
+ break;
+ default:
+ for (i=0; i <= safe_w; ++i) {
+ total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+ pixels[i] = (unsigned char) (total / kernel_width);
+ }
+ break;
+ }
+
+ for (; i < w; ++i) {
+ STBTT_assert(pixels[i] == 0);
+ total -= buffer[i & STBTT__OVER_MASK];
+ pixels[i] = (unsigned char) (total / kernel_width);
+ }
+
+ pixels += stride_in_bytes;
+ }
+}
+
+static void stbtt__v_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
+{
+ unsigned char buffer[STBTT_MAX_OVERSAMPLE];
+ int safe_h = h - kernel_width;
+ int j;
+ STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
+ for (j=0; j < w; ++j) {
+ int i;
+ unsigned int total;
+ STBTT_memset(buffer, 0, kernel_width);
+
+ total = 0;
+
+ // make kernel_width a constant in common cases so compiler can optimize out the divide
+ switch (kernel_width) {
+ case 2:
+ for (i=0; i <= safe_h; ++i) {
+ total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+ pixels[i*stride_in_bytes] = (unsigned char) (total / 2);
+ }
+ break;
+ case 3:
+ for (i=0; i <= safe_h; ++i) {
+ total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+ pixels[i*stride_in_bytes] = (unsigned char) (total / 3);
+ }
+ break;
+ case 4:
+ for (i=0; i <= safe_h; ++i) {
+ total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+ pixels[i*stride_in_bytes] = (unsigned char) (total / 4);
+ }
+ break;
+ case 5:
+ for (i=0; i <= safe_h; ++i) {
+ total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+ pixels[i*stride_in_bytes] = (unsigned char) (total / 5);
+ }
+ break;
+ default:
+ for (i=0; i <= safe_h; ++i) {
+ total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+ buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+ pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
+ }
+ break;
+ }
+
+ for (; i < h; ++i) {
+ STBTT_assert(pixels[i*stride_in_bytes] == 0);
+ total -= buffer[i & STBTT__OVER_MASK];
+ pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
+ }
+
+ pixels += 1;
+ }
+}
+
+static float stbtt__oversample_shift(int oversample)
+{
+ if (!oversample)
+ return 0.0f;
+
+ // The prefilter is a box filter of width "oversample",
+ // which shifts phase by (oversample - 1)/2 pixels in
+ // oversampled space. We want to shift in the opposite
+ // direction to counter this.
+ return (float)-(oversample - 1) / (2.0f * (float)oversample);
+}
+
+// rects array must be big enough to accommodate all characters in the given ranges
+STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
+{
+ int i,j,k;
+
+ k=0;
+ for (i=0; i < num_ranges; ++i) {
+ float fh = ranges[i].font_size;
+ float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
+ ranges[i].h_oversample = (unsigned char) spc->h_oversample;
+ ranges[i].v_oversample = (unsigned char) spc->v_oversample;
+ for (j=0; j < ranges[i].num_chars; ++j) {
+ int x0,y0,x1,y1;
+ int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
+ int glyph = stbtt_FindGlyphIndex(info, codepoint);
+ stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
+ scale * spc->h_oversample,
+ scale * spc->v_oversample,
+ 0,0,
+ &x0,&y0,&x1,&y1);
+ rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
+ rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
+ ++k;
+ }
+ }
+
+ return k;
+}
+
+// rects array must be big enough to accommodate all characters in the given ranges
+STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
+{
+ int i,j,k, return_value = 1;
+
+ // save current values
+ int old_h_over = spc->h_oversample;
+ int old_v_over = spc->v_oversample;
+
+ k = 0;
+ for (i=0; i < num_ranges; ++i) {
+ float fh = ranges[i].font_size;
+ float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
+ float recip_h,recip_v,sub_x,sub_y;
+ spc->h_oversample = ranges[i].h_oversample;
+ spc->v_oversample = ranges[i].v_oversample;
+ recip_h = 1.0f / spc->h_oversample;
+ recip_v = 1.0f / spc->v_oversample;
+ sub_x = stbtt__oversample_shift(spc->h_oversample);
+ sub_y = stbtt__oversample_shift(spc->v_oversample);
+ for (j=0; j < ranges[i].num_chars; ++j) {
+ stbrp_rect *r = &rects[k];
+ if (r->was_packed) {
+ stbtt_packedchar *bc = &ranges[i].chardata_for_range[j];
+ int advance, lsb, x0,y0,x1,y1;
+ int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
+ int glyph = stbtt_FindGlyphIndex(info, codepoint);
+ stbrp_coord pad = (stbrp_coord) spc->padding;
+
+ // pad on left and top
+ r->x += pad;
+ r->y += pad;
+ r->w -= pad;
+ r->h -= pad;
+ stbtt_GetGlyphHMetrics(info, glyph, &advance, &lsb);
+ stbtt_GetGlyphBitmapBox(info, glyph,
+ scale * spc->h_oversample,
+ scale * spc->v_oversample,
+ &x0,&y0,&x1,&y1);
+ stbtt_MakeGlyphBitmapSubpixel(info,
+ spc->pixels + r->x + r->y*spc->stride_in_bytes,
+ r->w - spc->h_oversample+1,
+ r->h - spc->v_oversample+1,
+ spc->stride_in_bytes,
+ scale * spc->h_oversample,
+ scale * spc->v_oversample,
+ 0,0,
+ glyph);
+
+ if (spc->h_oversample > 1)
+ stbtt__h_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
+ r->w, r->h, spc->stride_in_bytes,
+ spc->h_oversample);
+
+ if (spc->v_oversample > 1)
+ stbtt__v_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
+ r->w, r->h, spc->stride_in_bytes,
+ spc->v_oversample);
+
+ bc->x0 = (stbtt_int16) r->x;
+ bc->y0 = (stbtt_int16) r->y;
+ bc->x1 = (stbtt_int16) (r->x + r->w);
+ bc->y1 = (stbtt_int16) (r->y + r->h);
+ bc->xadvance = scale * advance;
+ bc->xoff = (float) x0 * recip_h + sub_x;
+ bc->yoff = (float) y0 * recip_v + sub_y;
+ bc->xoff2 = (x0 + r->w) * recip_h + sub_x;
+ bc->yoff2 = (y0 + r->h) * recip_v + sub_y;
+ } else {
+ return_value = 0; // if any fail, report failure
+ }
+
+ ++k;
+ }
+ }
+
+ // restore original values
+ spc->h_oversample = old_h_over;
+ spc->v_oversample = old_v_over;
+
+ return return_value;
+}
+
+STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects)
+{
+ stbrp_pack_rects((stbrp_context *) spc->pack_info, rects, num_rects);
+}
+
+STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges)
+{
+ stbtt_fontinfo info;
+ int i,j,n, return_value = 1;
+ //stbrp_context *context = (stbrp_context *) spc->pack_info;
+ stbrp_rect *rects;
+
+ // flag all characters as NOT packed
+ for (i=0; i < num_ranges; ++i)
+ for (j=0; j < ranges[i].num_chars; ++j)
+ ranges[i].chardata_for_range[j].x0 =
+ ranges[i].chardata_for_range[j].y0 =
+ ranges[i].chardata_for_range[j].x1 =
+ ranges[i].chardata_for_range[j].y1 = 0;
+
+ n = 0;
+ for (i=0; i < num_ranges; ++i)
+ n += ranges[i].num_chars;
+
+ rects = (stbrp_rect *) STBTT_malloc(sizeof(*rects) * n, spc->user_allocator_context);
+ if (rects == NULL)
+ return 0;
+
+ info.userdata = spc->user_allocator_context;
+ stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index));
+
+ n = stbtt_PackFontRangesGatherRects(spc, &info, ranges, num_ranges, rects);
+
+ stbtt_PackFontRangesPackRects(spc, rects, n);
+
+ return_value = stbtt_PackFontRangesRenderIntoRects(spc, &info, ranges, num_ranges, rects);
+
+ STBTT_free(rects, spc->user_allocator_context);
+ return return_value;
+}
+
+STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, float font_size,
+ int first_unicode_codepoint_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range)
+{
+ stbtt_pack_range range;
+ range.first_unicode_codepoint_in_range = first_unicode_codepoint_in_range;
+ range.array_of_unicode_codepoints = NULL;
+ range.num_chars = num_chars_in_range;
+ range.chardata_for_range = chardata_for_range;
+ range.font_size = font_size;
+ return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1);
+}
+
+STBTT_DEF void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer)
+{
+ float ipw = 1.0f / pw, iph = 1.0f / ph;
+ stbtt_packedchar *b = chardata + char_index;
+
+ if (align_to_integer) {
+ float x = (float) STBTT_ifloor((*xpos + b->xoff) + 0.5f);
+ float y = (float) STBTT_ifloor((*ypos + b->yoff) + 0.5f);
+ q->x0 = x;
+ q->y0 = y;
+ q->x1 = x + b->xoff2 - b->xoff;
+ q->y1 = y + b->yoff2 - b->yoff;
+ } else {
+ q->x0 = *xpos + b->xoff;
+ q->y0 = *ypos + b->yoff;
+ q->x1 = *xpos + b->xoff2;
+ q->y1 = *ypos + b->yoff2;
+ }
+
+ q->s0 = b->x0 * ipw;
+ q->t0 = b->y0 * iph;
+ q->s1 = b->x1 * ipw;
+ q->t1 = b->y1 * iph;
+
+ *xpos += b->xadvance;
+}
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// font name matching -- recommended not to use this
+//
+
+// check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string
+static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(const stbtt_uint8 *s1, stbtt_int32 len1, const stbtt_uint8 *s2, stbtt_int32 len2)
+{
+ stbtt_int32 i=0;
+
+ // convert utf16 to utf8 and compare the results while converting
+ while (len2) {
+ stbtt_uint16 ch = s2[0]*256 + s2[1];
+ if (ch < 0x80) {
+ if (i >= len1) return -1;
+ if (s1[i++] != ch) return -1;
+ } else if (ch < 0x800) {
+ if (i+1 >= len1) return -1;
+ if (s1[i++] != 0xc0 + (ch >> 6)) return -1;
+ if (s1[i++] != 0x80 + (ch & 0x3f)) return -1;
+ } else if (ch >= 0xd800 && ch < 0xdc00) {
+ stbtt_uint32 c;
+ stbtt_uint16 ch2 = s2[2]*256 + s2[3];
+ if (i+3 >= len1) return -1;
+ c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000;
+ if (s1[i++] != 0xf0 + (c >> 18)) return -1;
+ if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1;
+ if (s1[i++] != 0x80 + ((c >> 6) & 0x3f)) return -1;
+ if (s1[i++] != 0x80 + ((c ) & 0x3f)) return -1;
+ s2 += 2; // plus another 2 below
+ len2 -= 2;
+ } else if (ch >= 0xdc00 && ch < 0xe000) {
+ return -1;
+ } else {
+ if (i+2 >= len1) return -1;
+ if (s1[i++] != 0xe0 + (ch >> 12)) return -1;
+ if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1;
+ if (s1[i++] != 0x80 + ((ch ) & 0x3f)) return -1;
+ }
+ s2 += 2;
+ len2 -= 2;
+ }
+ return i;
+}
+
+STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2)
+{
+ return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((const stbtt_uint8*) s1, len1, (const stbtt_uint8*) s2, len2);
+}
+
+// returns results in whatever encoding you request... but note that 2-byte encodings
+// will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare
+STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID)
+{
+ stbtt_int32 i,count,stringOffset;
+ stbtt_uint8 *fc = font->data;
+ stbtt_uint32 offset = font->fontstart;
+ stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
+ if (!nm) return NULL;
+
+ count = ttUSHORT(fc+nm+2);
+ stringOffset = nm + ttUSHORT(fc+nm+4);
+ for (i=0; i < count; ++i) {
+ stbtt_uint32 loc = nm + 6 + 12 * i;
+ if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2)
+ && languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) {
+ *length = ttUSHORT(fc+loc+8);
+ return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
+ }
+ }
+ return NULL;
+}
+
+static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
+{
+ stbtt_int32 i;
+ stbtt_int32 count = ttUSHORT(fc+nm+2);
+ stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4);
+
+ for (i=0; i < count; ++i) {
+ stbtt_uint32 loc = nm + 6 + 12 * i;
+ stbtt_int32 id = ttUSHORT(fc+loc+6);
+ if (id == target_id) {
+ // find the encoding
+ stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4);
+
+ // is this a Unicode encoding?
+ if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
+ stbtt_int32 slen = ttUSHORT(fc+loc+8);
+ stbtt_int32 off = ttUSHORT(fc+loc+10);
+
+ // check if there's a prefix match
+ stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
+ if (matchlen >= 0) {
+ // check for target_id+1 immediately following, with same encoding & language
+ if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
+ slen = ttUSHORT(fc+loc+12+8);
+ off = ttUSHORT(fc+loc+12+10);
+ if (slen == 0) {
+ if (matchlen == nlen)
+ return 1;
+ } else if (matchlen < nlen && name[matchlen] == ' ') {
+ ++matchlen;
+ if (stbtt_CompareUTF8toUTF16_bigendian((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen))
+ return 1;
+ }
+ } else {
+ // if nothing immediately following
+ if (matchlen == nlen)
+ return 1;
+ }
+ }
+ }
+
+ // @TODO handle other encodings
+ }
+ }
+ return 0;
+}
+
+static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags)
+{
+ stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name);
+ stbtt_uint32 nm,hd;
+ if (!stbtt__isfont(fc+offset)) return 0;
+
+ // check italics/bold/underline flags in macStyle...
+ if (flags) {
+ hd = stbtt__find_table(fc, offset, "head");
+ if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0;
+ }
+
+ nm = stbtt__find_table(fc, offset, "name");
+ if (!nm) return 0;
+
+ if (flags) {
+ // if we checked the macStyle flags, then just check the family and ignore the subfamily
+ if (stbtt__matchpair(fc, nm, name, nlen, 16, -1)) return 1;
+ if (stbtt__matchpair(fc, nm, name, nlen, 1, -1)) return 1;
+ if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
+ } else {
+ if (stbtt__matchpair(fc, nm, name, nlen, 16, 17)) return 1;
+ if (stbtt__matchpair(fc, nm, name, nlen, 1, 2)) return 1;
+ if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
+ }
+
+ return 0;
+}
+
+STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *font_collection, const char *name_utf8, stbtt_int32 flags)
+{
+ stbtt_int32 i;
+ for (i=0;;++i) {
+ stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i);
+ if (off < 0) return off;
+ if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags))
+ return off;
+ }
+}
+
+#endif // STB_TRUETYPE_IMPLEMENTATION
+
+
+// FULL VERSION HISTORY
+//
+// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use alloc userdata for PackFontRanges
+// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
+// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
+// allow PackFontRanges to pack and render in separate phases;
+// fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
+// fixed an assert() bug in the new rasterizer
+// replace assert() with STBTT_assert() in new rasterizer
+// 1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine)
+// also more precise AA rasterizer, except if shapes overlap
+// remove need for STBTT_sort
+// 1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC
+// 1.04 (2015-04-15) typo in example
+// 1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes
+// 1.02 (2014-12-10) fix various warnings & compile issues w/ stb_rect_pack, C++
+// 1.01 (2014-12-08) fix subpixel position when oversampling to exactly match
+// non-oversampled; STBTT_POINT_SIZE for packed case only
+// 1.00 (2014-12-06) add new PackBegin etc. API, w/ support for oversampling
+// 0.99 (2014-09-18) fix multiple bugs with subpixel rendering (ryg)
+// 0.9 (2014-08-07) support certain mac/iOS fonts without an MS platformID
+// 0.8b (2014-07-07) fix a warning
+// 0.8 (2014-05-25) fix a few more warnings
+// 0.7 (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back
+// 0.6c (2012-07-24) improve documentation
+// 0.6b (2012-07-20) fix a few more warnings
+// 0.6 (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
+// stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty
+// 0.5 (2011-12-09) bugfixes:
+// subpixel glyph renderer computed wrong bounding box
+// first vertex of shape can be off-curve (FreeSans)
+// 0.4b (2011-12-03) fixed an error in the font baking example
+// 0.4 (2011-12-01) kerning, subpixel rendering (tor)
+// bugfixes for:
+// codepoint-to-glyph conversion using table fmt=12
+// codepoint-to-glyph conversion using table fmt=4
+// stbtt_GetBakedQuad with non-square texture (Zer)
+// updated Hello World! sample to use kerning and subpixel
+// fixed some warnings
+// 0.3 (2009-06-24) cmap fmt=12, compound shapes (MM)
+// userdata, malloc-from-userdata, non-zero fill (stb)
+// 0.2 (2009-03-11) Fix unsigned/signed char warnings
+// 0.1 (2009-03-09) First public release
+//
