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- // stb_truetype.h - v1.02 - public domain
- // authored from 2009-2014 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
- //
- // Misc other:
- // Ryan Gordon
- //
- // VERSION HISTORY
- //
- // 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
- //
- // LICENSE
- //
- // This software is in the public domain. Where that dedication is not
- // recognized, you are granted a perpetual, irrevokable license to copy
- // 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.
- //
- // 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()
- // 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()
- //
- // 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
-
-
- //////////////////////////////////////////////////////////////////////////////
- //////////////////////////////////////////////////////////////////////////////
- ////
- //// 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"
-
- char ttf_buffer[1<<20];
- unsigned char temp_bitmap[512*512];
-
- stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
- GLstbtt_uint ftex;
-
- void my_stbtt_initfont(void)
- {
- fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
- stbtt_BakeFontBitmap(data,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
- 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!";
-
- 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_sort() to override this to avoid qsort
- #ifndef STBTT_sort
- #include <stdlib.h>
- #define STBTT_sort(data,num_items,item_size,compare_func) qsort(data,num_items,item_size,compare_func)
- #endif
-
- // #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 __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;
-
- extern 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;
-
- extern 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;
-
- extern 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.
-
- extern void stbtt_PackEnd (stbtt_pack_context *spc);
- // Cleans up the packing context and frees all memory.
-
- #define STBTT_POINT_SIZE(x) (-(x))
-
- extern 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_char_in_range;
- int num_chars_in_range;
- stbtt_packedchar *chardata_for_range; // output
- } stbtt_pack_range;
-
- extern 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.
-
-
- extern 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). The default (no oversampling) is achieved by
- // h_oversample=1, 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
-
- extern 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);
-
- // 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
- //
- //
-
- extern 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;
-
- extern 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
-
- 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
- //
-
- extern 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.
-
- extern 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.
-
- extern 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
-
- extern void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
- // the bounding box around all possible characters
-
- extern 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
-
- extern int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
- // an additional amount to add to the 'advance' value between ch1 and ch2
-
- extern 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
-
- extern void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
- extern int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
- extern 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
-
- extern int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
- // returns non-zero if nothing is drawn for this glyph
-
- extern int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
- extern 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.
-
- extern void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
- // frees the data allocated above
-
- //////////////////////////////////////////////////////////////////////////////
- //
- // BITMAP RENDERING
- //
-
- extern void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
- // frees the bitmap allocated below
-
- extern 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
-
- extern 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
-
- extern 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.
-
- extern 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
-
- extern 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.)
-
- extern 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)
- extern unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff);
- extern 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);
- extern 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);
- extern 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);
- extern void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
- extern 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;
-
- extern 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);
-
- //////////////////////////////////////////////////////////////////////////////
- //
- // 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.
-
-
- extern 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
-
- extern 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
-
- extern 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
-
- typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1];
-
- //////////////////////////////////////////////////////////////////////////
- //
- // 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
-
- stbtt_uint16 ttUSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
- stbtt_int16 ttSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
- stbtt_uint32 ttULONG(const stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
- 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;
- }
-
- 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*14);
- }
- }
- return -1;
- }
-
- 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;
- }
-
- 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;
- stbtt_uint16 item, offset, start, end;
-
- // 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) {
- searchRange >>= 1;
- start = ttUSHORT(data + search + searchRange*2 + segcount*2 + 2);
- end = ttUSHORT(data + search + searchRange*2);
- if (unicode_codepoint > end)
- search += searchRange*2;
- --entrySelector;
- }
- search += 2;
-
- 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);
- end = ttUSHORT(data + index_map + 14 + 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;
- }
-
- 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
- }
-
- 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;
- }
-
- 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);
- }
-
- 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;
- }
-
- 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;
- }
-
- 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));
- }
- }
-
- 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;
- }
-
- 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));
- }
-
- void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
- {
- stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
- }
-
- 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);
- }
-
- 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);
- }
-
- 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;
- }
-
- float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
- {
- int unitsPerEm = ttUSHORT(info->data + info->head + 18);
- return pixels / unitsPerEm;
- }
-
- void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
- {
- STBTT_free(v, info->userdata);
- }
-
- //////////////////////////////////////////////////////////////////////////////
- //
- // antialiasing software rasterizer
- //
-
- 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,y0,x1,y1;
- 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);
- }
- }
-
- 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);
- }
-
- 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);
- }
-
- 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);
- }
-
- typedef struct stbtt__edge {
- float x0,y0, x1,y1;
- int invert;
- } stbtt__edge;
-
- typedef struct stbtt__active_edge
- {
- int x,dx;
- float ey;
- struct stbtt__active_edge *next;
- int valid;
- } stbtt__active_edge;
-
- #define FIXSHIFT 10
- #define FIX (1 << FIXSHIFT)
- #define FIXMASK (FIX-1)
-
- static stbtt__active_edge *new_active(stbtt__edge *e, int off_x, float start_point, void *userdata)
- {
- stbtt__active_edge *z = (stbtt__active_edge *) STBTT_malloc(sizeof(*z), userdata); // @TODO: make a pool of these!!!
- float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
- STBTT_assert(e->y0 <= start_point);
- if (!z) return z;
- // round dx down to avoid going too far
- if (dxdy < 0)
- z->dx = -STBTT_ifloor(FIX * -dxdy);
- else
- z->dx = STBTT_ifloor(FIX * dxdy);
- z->x = STBTT_ifloor(FIX * (e->x0 + dxdy * (start_point - e->y0)));
- z->x -= off_x * FIX;
- z->ey = e->y1;
- z->next = 0;
- z->valid = e->invert ? 1 : -1;
- return z;
- }
-
- // 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->valid;
- } else {
- int x1 = e->x; w += e->valid;
- // if we went to zero, we need to draw
- if (w == 0) {
- int i = x0 >> FIXSHIFT;
- int j = x1 >> 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 >> FIXSHIFT);
- } else {
- if (i >= 0) // add antialiasing for x0
- scanline[i] = scanline[i] + (stbtt_uint8) (((FIX - (x0 & FIXMASK)) * max_weight) >> FIXSHIFT);
- else
- i = -1; // clip
-
- if (j < len) // add antialiasing for x1
- scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & FIXMASK) * max_weight) >> 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__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->valid);
- z->valid = 0;
- STBTT_free(z, userdata);
- } 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 = new_active(e, off_x, scan_y, userdata);
- // 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;
- }
-
- while (active) {
- stbtt__active_edge *z = active;
- active = active->next;
- STBTT_free(z, userdata);
- }
-
- if (scanline != scanline_data)
- STBTT_free(scanline, userdata);
- }
-
- static int stbtt__edge_compare(const void *p, const void *q)
- {
- stbtt__edge *a = (stbtt__edge *) p;
- stbtt__edge *b = (stbtt__edge *) q;
-
- if (a->y0 < b->y0) return -1;
- if (a->y0 > b->y0) return 1;
- return 0;
- }
-
- 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;
- int vsubsample = result->h < 8 ? 15 : 5;
- // 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);
-
- // 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
- 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;
- }
-
- 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);
- }
- }
-
- void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
- {
- STBTT_free(bitmap, userdata);
- }
-
- 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;
- }
-
- 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);
- }
-
- 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);
- }
-
- 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);
- }
-
- 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);
- }
-
- 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));
- }
-
- 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);
- }
-
- 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
-
- extern 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;
- 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;
- }
-
- 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) + 0.5);
- int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5);
-
- 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;
-
- typedef struct
- {
- stbrp_coord x,y;
- int id,w,h,was_packed;
- } stbrp_rect;
-
- 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.
-
- 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);
-
- STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
-
- return 1;
- }
-
- void stbtt_PackEnd (stbtt_pack_context *spc)
- {
- STBTT_free(spc->nodes , spc->user_allocator_context);
- STBTT_free(spc->pack_info, spc->user_allocator_context);
- }
-
- 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;
- for (j=0; j < h; ++j) {
- int i;
- unsigned int total;
- 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;
- 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;
- for (j=0; j < w; ++j) {
- int i;
- unsigned int total;
- 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;
- 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);
- }
-
- int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges)
- {
- stbtt_fontinfo info;
- float recip_h = 1.0f / spc->h_oversample;
- float recip_v = 1.0f / spc->v_oversample;
- float sub_x = stbtt__oversample_shift(spc->h_oversample);
- float sub_y = stbtt__oversample_shift(spc->v_oversample);
- int i,j,k,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_in_range; ++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_in_range;
-
- rects = (stbrp_rect *) STBTT_malloc(sizeof(*rects) * n, spc->user_allocator_context);
- if (rects == NULL)
- return 0;
-
- stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index));
- 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);
- for (j=0; j < ranges[i].num_chars_in_range; ++j) {
- int x0,y0,x1,y1;
- stbtt_GetCodepointBitmapBoxSubpixel(&info, ranges[i].first_unicode_char_in_range + j,
- 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;
- }
- }
-
- stbrp_pack_rects(context, rects, 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);
- for (j=0; j < ranges[i].num_chars_in_range; ++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 glyph = stbtt_FindGlyphIndex(&info, ranges[i].first_unicode_char_in_range + j);
- 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;
- }
- }
-
- return return_value;
- }
-
- 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)
- {
- stbtt_pack_range range;
- range.first_unicode_char_in_range = first_unicode_char_in_range;
- range.num_chars_in_range = 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);
- }
-
- 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) + 0.5);
- float y = (float) STBTT_ifloor((*ypos + b->yoff) + 0.5);
- 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;
- }
-
- 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
- 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;
- }
-
- 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
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