lnvis

fontstash.h (48263B)

---

 //
 // 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 != (size_t)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