| 0,0 → 1,2614 |
|---|
| // 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; |
| STBTT_memset(buffer, 0, kernel_width); |
| |
| total = 0; |
| |
| // make kernel_width a constant in common cases so compiler can optimize out the divide |
| switch (kernel_width) { |
| case 2: |
| for (i=0; i <= safe_w; ++i) { |
| total += pixels[i] - buffer[i & STBTT__OVER_MASK]; |
| buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; |
| pixels[i] = (unsigned char) (total / 2); |
| } |
| break; |
| case 3: |
| for (i=0; i <= safe_w; ++i) { |
| total += pixels[i] - buffer[i & STBTT__OVER_MASK]; |
| buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; |
| pixels[i] = (unsigned char) (total / 3); |
| } |
| break; |
| case 4: |
| for (i=0; i <= safe_w; ++i) { |
| total += pixels[i] - buffer[i & STBTT__OVER_MASK]; |
| buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; |
| pixels[i] = (unsigned char) (total / 4); |
| } |
| break; |
| 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; |
| STBTT_memset(buffer, 0, kernel_width); |
| |
| total = 0; |
| |
| // make kernel_width a constant in common cases so compiler can optimize out the divide |
| switch (kernel_width) { |
| case 2: |
| for (i=0; i <= safe_h; ++i) { |
| total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; |
| buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; |
| pixels[i*stride_in_bytes] = (unsigned char) (total / 2); |
| } |
| break; |
| case 3: |
| for (i=0; i <= safe_h; ++i) { |
| total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; |
| buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; |
| pixels[i*stride_in_bytes] = (unsigned char) (total / 3); |
| } |
| break; |
| case 4: |
| for (i=0; i <= safe_h; ++i) { |
| total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; |
| buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; |
| pixels[i*stride_in_bytes] = (unsigned char) (total / 4); |
| } |
| break; |
| 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; |
| } |
| } |
| |
| zfree(rects); /////////////////////////////// |
| |
| 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 |