lnvis

stb_truetype.h (127303B)

---

 // 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)
 {
 	(void)vsubsample;
    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
 //