| // [DEAR IMGUI] |
| // This is a slightly modified version of stb_truetype.h 1.26. |
| // Mostly fixing for compiler and static analyzer warnings. |
| // Grep for [DEAR IMGUI] to find the changes. |
| |
| // stb_truetype.h - v1.26 - public domain |
| // authored from 2009-2021 by Sean Barrett / RAD Game Tools |
| // |
| // ======================================================================= |
| // |
| // NO SECURITY GUARANTEE -- DO NOT USE THIS ON UNTRUSTED FONT FILES |
| // |
| // This library does no range checking of the offsets found in the file, |
| // meaning an attacker can use it to read arbitrary memory. |
| // |
| // ======================================================================= |
| // |
| // This library processes TrueType files: |
| // parse files |
| // extract glyph metrics |
| // extract glyph shapes |
| // render glyphs to one-channel bitmaps with antialiasing (box filter) |
| // render glyphs to one-channel SDF bitmaps (signed-distance field/function) |
| // |
| // 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 |
| // Dougall Johnson: OpenType / Type 2 font handling |
| // Daniel Ribeiro Maciel: basic GPOS-based kerning |
| // |
| // Misc other: |
| // Ryan Gordon |
| // Simon Glass |
| // github:IntellectualKitty |
| // Imanol Celaya |
| // Daniel Ribeiro Maciel |
| // |
| // Bug/warning reports/fixes: |
| // "Zer" on mollyrocket Fabian "ryg" Giesen github:NiLuJe |
| // Cass Everitt Martins Mozeiko github:aloucks |
| // stoiko (Haemimont Games) Cap Petschulat github:oyvindjam |
| // Brian Hook Omar Cornut github:vassvik |
| // Walter van Niftrik Ryan Griege |
| // David Gow Peter LaValle |
| // David Given Sergey Popov |
| // Ivan-Assen Ivanov Giumo X. Clanjor |
| // Anthony Pesch Higor Euripedes |
| // Johan Duparc Thomas Fields |
| // Hou Qiming Derek Vinyard |
| // Rob Loach Cort Stratton |
| // Kenney Phillis Jr. Brian Costabile |
| // Ken Voskuil (kaesve) |
| // |
| // VERSION HISTORY |
| // |
| // 1.26 (2021-08-28) fix broken rasterizer |
| // 1.25 (2021-07-11) many fixes |
| // 1.24 (2020-02-05) fix warning |
| // 1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS) |
| // 1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined |
| // 1.21 (2019-02-25) fix warning |
| // 1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics() |
| // 1.19 (2018-02-11) GPOS kerning, STBTT_fmod |
| // 1.18 (2018-01-29) add missing function |
| // 1.17 (2017-07-23) make more arguments const; doc fix |
| // 1.16 (2017-07-12) SDF support |
| // 1.15 (2017-03-03) make more arguments const |
| // 1.14 (2017-01-16) num-fonts-in-TTC function |
| // 1.13 (2017-01-02) support OpenType fonts, certain Apple fonts |
| // 1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual |
| // 1.11 (2016-04-02) fix unused-variable warning |
| // 1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef |
| // 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly |
| // 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges |
| // 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints; |
| // variant PackFontRanges to pack and render in separate phases; |
| // fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?); |
| // fixed an assert() bug in the new rasterizer |
| // replace assert() with STBTT_assert() in new rasterizer |
| // |
| // Full history can be found at the end of this file. |
| // |
| // LICENSE |
| // |
| // See end of file for license information. |
| // |
| // USAGE |
| // |
| // Include this file in whatever places need to refer to it. In ONE C/C++ |
| // file, write: |
| // #define STB_TRUETYPE_IMPLEMENTATION |
| // before the #include of this file. This expands out the actual |
| // implementation into that C/C++ file. |
| // |
| // To make the implementation private to the file that generates the implementation, |
| // #define STBTT_STATIC |
| // |
| // Simple 3D API (don't ship this, but it's fine for tools and quick start) |
| // stbtt_BakeFontBitmap() -- bake a font to a bitmap for use as texture |
| // stbtt_GetBakedQuad() -- compute quad to draw for a given char |
| // |
| // Improved 3D API (more shippable): |
| // #include "stb_rect_pack.h" -- optional, but you really want it |
| // stbtt_PackBegin() |
| // stbtt_PackSetOversampling() -- for improved quality on small fonts |
| // stbtt_PackFontRanges() -- pack and renders |
| // stbtt_PackEnd() |
| // stbtt_GetPackedQuad() |
| // |
| // "Load" a font file from a memory buffer (you have to keep the buffer loaded) |
| // stbtt_InitFont() |
| // stbtt_GetFontOffsetForIndex() -- indexing for TTC font collections |
| // stbtt_GetNumberOfFonts() -- number of fonts 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_GetFontVMetricsOS2() |
| // stbtt_GetCodepointKernAdvance() |
| // |
| // Starting with version 1.06, the rasterizer was replaced with a new, |
| // faster and generally-more-precise rasterizer. The new rasterizer more |
| // accurately measures pixel coverage for anti-aliasing, except in the case |
| // where multiple shapes overlap, in which case it overestimates the AA pixel |
| // coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If |
| // this turns out to be a problem, you can re-enable the old rasterizer with |
| // #define STBTT_RASTERIZER_VERSION 1 |
| // which will incur about a 15% speed hit. |
| // |
| // ADDITIONAL DOCUMENTATION |
| // |
| // Immediately after this block comment are a series of sample programs. |
| // |
| // After the sample programs is the "header file" section. This section |
| // includes documentation for each API function. |
| // |
| // Some important concepts to understand to use this library: |
| // |
| // Codepoint |
| // Characters are defined by unicode codepoints, e.g. 65 is |
| // uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is |
| // the hiragana for "ma". |
| // |
| // Glyph |
| // A visual character shape (every codepoint is rendered as |
| // some glyph) |
| // |
| // Glyph index |
| // A font-specific integer ID representing a glyph |
| // |
| // Baseline |
| // Glyph shapes are defined relative to a baseline, which is the |
| // bottom of uppercase characters. Characters extend both above |
| // and below the baseline. |
| // |
| // Current Point |
| // As you draw text to the screen, you keep track of a "current point" |
| // which is the origin of each character. The current point's vertical |
| // position is the baseline. Even "baked fonts" use this model. |
| // |
| // Vertical Font Metrics |
| // The vertical qualities of the font, used to vertically position |
| // and space the characters. See docs for stbtt_GetFontVMetrics. |
| // |
| // Font Size in Pixels or Points |
| // The preferred interface for specifying font sizes in stb_truetype |
| // is to specify how tall the font's vertical extent should be in pixels. |
| // If that sounds good enough, skip the next paragraph. |
| // |
| // Most font APIs instead use "points", which are a common typographic |
| // measurement for describing font size, defined as 72 points per inch. |
| // stb_truetype provides a point API for compatibility. However, true |
| // "per inch" conventions don't make much sense on computer displays |
| // since 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. |
| // |
| // DETAILED USAGE: |
| // |
| // Scale: |
| // Select how high you want the font to be, in points or pixels. |
| // Call ScaleForPixelHeight or ScaleForMappingEmToPixels to compute |
| // a scale factor SF that will be used by all other functions. |
| // |
| // Baseline: |
| // You need to select a y-coordinate that is the baseline of where |
| // your text will appear. Call GetFontBoundingBox to get the baseline-relative |
| // bounding box for all characters. SF*-y0 will be the distance in pixels |
| // that the worst-case character could extend above the baseline, so if |
| // you want the top edge of characters to appear at the top of the |
| // screen where y=0, then you would set the baseline to SF*-y0. |
| // |
| // Current point: |
| // Set the current point where the first character will appear. The |
| // first character could extend left of the current point; this is font |
| // dependent. You can either choose a current point that is the leftmost |
| // point and hope, or add some padding, or check the bounding box or |
| // left-side-bearing of the first character to be displayed and set |
| // the current point based on that. |
| // |
| // Displaying a character: |
| // Compute the bounding box of the character. It will contain signed values |
| // relative to <current_point, baseline>. I.e. if it returns x0,y0,x1,y1, |
| // then the character should be displayed in the rectangle from |
| // <current_point+SF*x0, baseline+SF*y0> to <current_point+SF*x1,baseline+SF*y1). |
| // |
| // Advancing for the next character: |
| // Call GlyphHMetrics, and compute 'current_point += SF * advance'. |
| // |
| // |
| // 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. |
| // |
| // |
| // PERFORMANCE MEASUREMENTS FOR 1.06: |
| // |
| // 32-bit 64-bit |
| // Previous release: 8.83 s 7.68 s |
| // Pool allocations: 7.72 s 6.34 s |
| // Inline sort : 6.54 s 5.65 s |
| // New rasterizer : 5.63 s 5.00 s |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| ////////////////////////////////////////////////////////////////////////////// |
| //// |
| //// SAMPLE PROGRAMS |
| //// |
| // |
| // Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless. |
| // See "tests/truetype_demo_win32.c" for a complete version. |
| #if 0 |
| #define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation |
| #include "stb_truetype.h" |
| |
| unsigned char ttf_buffer[1<<20]; |
| unsigned char temp_bitmap[512*512]; |
| |
| stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs |
| GLuint ftex; |
| |
| void my_stbtt_initfont(void) |
| { |
| fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb")); |
| stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits! |
| // can free ttf_buffer at this point |
| glGenTextures(1, &ftex); |
| glBindTexture(GL_TEXTURE_2D, ftex); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap); |
| // can free temp_bitmap at this point |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| } |
| |
| void my_stbtt_print(float x, float y, char *text) |
| { |
| // assume orthographic projection with units = screen pixels, origin at top left |
| glEnable(GL_BLEND); |
| glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
| glEnable(GL_TEXTURE_2D); |
| glBindTexture(GL_TEXTURE_2D, ftex); |
| glBegin(GL_QUADS); |
| while (*text) { |
| if (*text >= 32 && *text < 128) { |
| stbtt_aligned_quad q; |
| stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9 |
| glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y0); |
| glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y0); |
| glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y1); |
| glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y1); |
| } |
| ++text; |
| } |
| glEnd(); |
| } |
| #endif |
| // |
| // |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // Complete program (this compiles): get a single bitmap, print as ASCII art |
| // |
| #if 0 |
| #include <stdio.h> |
| #define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation |
| #include "stb_truetype.h" |
| |
| char ttf_buffer[1<<25]; |
| |
| int main(int argc, char **argv) |
| { |
| stbtt_fontinfo font; |
| unsigned char *bitmap; |
| int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20); |
| |
| fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb")); |
| |
| stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0)); |
| bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0); |
| |
| for (j=0; j < h; ++j) { |
| for (i=0; i < w; ++i) |
| putchar(" .:ioVM@"[bitmap[j*w+i]>>5]); |
| putchar('\n'); |
| } |
| return 0; |
| } |
| #endif |
| // |
| // Output: |
| // |
| // .ii. |
| // @@@@@@. |
| // V@Mio@@o |
| // :i. V@V |
| // :oM@@M |
| // :@@@MM@M |
| // @@o o@M |
| // :@@. M@M |
| // @@@o@@@@ |
| // :M@@V:@@. |
| // |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // Complete program: print "Hello World!" banner, with bugs |
| // |
| #if 0 |
| char buffer[24<<20]; |
| unsigned char screen[20][79]; |
| |
| int main(int arg, char **argv) |
| { |
| stbtt_fontinfo font; |
| int i,j,ascent,baseline,ch=0; |
| float scale, xpos=2; // leave a little padding in case the character extends left |
| char *text = "Heljo World!"; // intentionally misspelled to show 'lj' brokenness |
| |
| fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb")); |
| stbtt_InitFont(&font, buffer, 0); |
| |
| scale = stbtt_ScaleForPixelHeight(&font, 15); |
| stbtt_GetFontVMetrics(&font, &ascent,0,0); |
| baseline = (int) (ascent*scale); |
| |
| while (text[ch]) { |
| int advance,lsb,x0,y0,x1,y1; |
| float x_shift = xpos - (float) floor(xpos); |
| stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb); |
| stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1); |
| stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]); |
| // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong |
| // because this API is really for baking character bitmaps into textures. if you want to render |
| // a sequence of characters, you really need to render each bitmap to a temp buffer, then |
| // "alpha blend" that into the working buffer |
| xpos += (advance * scale); |
| if (text[ch+1]) |
| xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]); |
| ++ch; |
| } |
| |
| for (j=0; j < 20; ++j) { |
| for (i=0; i < 78; ++i) |
| putchar(" .:ioVM@"[screen[j][i]>>5]); |
| putchar('\n'); |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| ////////////////////////////////////////////////////////////////////////////// |
| //// |
| //// INTEGRATION WITH YOUR CODEBASE |
| //// |
| //// The following sections allow you to supply alternate definitions |
| //// of C library functions used by stb_truetype, e.g. if you don't |
| //// link with the C runtime library. |
| |
| #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]; |
| |
| // e.g. #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) |
| #define STBTT_pow(x,y) pow(x,y) |
| #endif |
| |
| #ifndef STBTT_fmod |
| #include <math.h> |
| #define STBTT_fmod(x,y) fmod(x,y) |
| #endif |
| |
| #ifndef STBTT_cos |
| #include <math.h> |
| #define STBTT_cos(x) cos(x) |
| #define STBTT_acos(x) acos(x) |
| #endif |
| |
| #ifndef STBTT_fabs |
| #include <math.h> |
| #define STBTT_fabs(x) fabs(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 <string.h> |
| #define STBTT_memcpy memcpy |
| #define STBTT_memset memset |
| #endif |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////// |
| //// |
| //// INTERFACE |
| //// |
| //// |
| |
| #ifndef __STB_INCLUDE_STB_TRUETYPE_H__ |
| #define __STB_INCLUDE_STB_TRUETYPE_H__ |
| |
| #ifdef STBTT_STATIC |
| #define STBTT_DEF static |
| #else |
| #define STBTT_DEF extern |
| #endif |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| // private structure |
| typedef struct |
| { |
| unsigned char *data; |
| int cursor; |
| int size; |
| } stbtt__buf; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // TEXTURE BAKING API |
| // |
| // If you use this API, you only have to call two functions ever. |
| // |
| |
| typedef struct |
| { |
| unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap |
| float xoff,yoff,xadvance; |
| } stbtt_bakedchar; |
| |
| STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf) |
| float pixel_height, // height of font in pixels |
| unsigned char *pixels, int pw, int ph, // bitmap to be filled in |
| int first_char, int num_chars, // characters to bake |
| stbtt_bakedchar *chardata); // you allocate this, it's num_chars long |
| // if return is positive, the first unused row of the bitmap |
| // if return is negative, returns the negative of the number of characters that fit |
| // if return is 0, no characters fit and no rows were used |
| // This uses a very crappy packing. |
| |
| typedef struct |
| { |
| float x0,y0,s0,t0; // top-left |
| float x1,y1,s1,t1; // bottom-right |
| } stbtt_aligned_quad; |
| |
| STBTT_DEF void stbtt_GetBakedQuad(const 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. |
| |
| STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap); |
| // Query the font vertical metrics without having to create a font first. |
| |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // NEW TEXTURE BAKING API |
| // |
| // This provides options for packing multiple fonts into one atlas, not |
| // perfectly but better than nothing. |
| |
| typedef struct |
| { |
| unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap |
| float xoff,yoff,xadvance; |
| float xoff2,yoff2; |
| } stbtt_packedchar; |
| |
| typedef struct stbtt_pack_context stbtt_pack_context; |
| typedef struct stbtt_fontinfo stbtt_fontinfo; |
| #ifndef STB_RECT_PACK_VERSION |
| typedef struct stbrp_rect stbrp_rect; |
| #endif |
| |
| STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int width, int height, int stride_in_bytes, int padding, void *alloc_context); |
| // Initializes a packing context stored in the passed-in stbtt_pack_context. |
| // Future calls using this context will pack characters into the bitmap passed |
| // in here: a 1-channel bitmap that is width * height. stride_in_bytes is |
| // the distance from one row to the next (or 0 to mean they are packed tightly |
| // together). "padding" is the amount of padding to leave between each |
| // character (normally you want '1' for bitmaps you'll use as textures with |
| // bilinear filtering). |
| // |
| // Returns 0 on failure, 1 on success. |
| |
| STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc); |
| // Cleans up the packing context and frees all memory. |
| |
| #define STBTT_POINT_SIZE(x) (-(x)) |
| |
| STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size, |
| int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range); |
| // Creates character bitmaps from the font_index'th font found in fontdata (use |
| // font_index=0 if you don't know what that is). It creates num_chars_in_range |
| // bitmaps for characters with unicode values starting at first_unicode_char_in_range |
| // and increasing. Data for how to render them is stored in chardata_for_range; |
| // pass these to stbtt_GetPackedQuad to get back renderable quads. |
| // |
| // font_size is the full height of the character from ascender to descender, |
| // as computed by stbtt_ScaleForPixelHeight. To use a point size as computed |
| // by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE() |
| // and pass that result as 'font_size': |
| // ..., 20 , ... // font max minus min y is 20 pixels tall |
| // ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall |
| |
| typedef struct |
| { |
| float font_size; |
| int first_unicode_codepoint_in_range; // if non-zero, then the chars are continuous, and this is the first codepoint |
| int *array_of_unicode_codepoints; // if non-zero, then this is an array of unicode codepoints |
| int num_chars; |
| stbtt_packedchar *chardata_for_range; // output |
| unsigned char h_oversample, v_oversample; // don't set these, they're used internally |
| } stbtt_pack_range; |
| |
| STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges); |
| // Creates character bitmaps from multiple ranges of characters stored in |
| // ranges. This will usually create a better-packed bitmap than multiple |
| // calls to stbtt_PackFontRange. Note that you can call this multiple |
| // times within a single PackBegin/PackEnd. |
| |
| STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample); |
| // Oversampling a font increases the quality by allowing higher-quality subpixel |
| // positioning, and is especially valuable at smaller text sizes. |
| // |
| // This function sets the amount of oversampling for all following calls to |
| // stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given |
| // pack context. The default (no oversampling) is achieved by h_oversample=1 |
| // and v_oversample=1. The total number of pixels required is |
| // h_oversample*v_oversample larger than the default; for example, 2x2 |
| // oversampling requires 4x the storage of 1x1. For best results, render |
| // oversampled textures with bilinear filtering. Look at the readme in |
| // stb/tests/oversample for information about oversampled fonts |
| // |
| // To use with PackFontRangesGather etc., you must set it before calls |
| // call to PackFontRangesGatherRects. |
| |
| STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip); |
| // If skip != 0, this tells stb_truetype to skip any codepoints for which |
| // there is no corresponding glyph. If skip=0, which is the default, then |
| // codepoints without a glyph recived the font's "missing character" glyph, |
| // typically an empty box by convention. |
| |
| STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, // same data as above |
| int char_index, // character to display |
| float *xpos, float *ypos, // pointers to current position in screen pixel space |
| stbtt_aligned_quad *q, // output: quad to draw |
| int align_to_integer); |
| |
| STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects); |
| STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects); |
| STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects); |
| // Calling these functions in sequence is roughly equivalent to calling |
| // stbtt_PackFontRanges(). If you more control over the packing of multiple |
| // fonts, or if you want to pack custom data into a font texture, take a look |
| // at the source to of stbtt_PackFontRanges() and create a custom version |
| // using these functions, e.g. call GatherRects multiple times, |
| // building up a single array of rects, then call PackRects once, |
| // then call RenderIntoRects repeatedly. This may result in a |
| // better packing than calling PackFontRanges multiple times |
| // (or it may not). |
| |
| // this is an opaque structure that you shouldn't mess with which holds |
| // all the context needed from PackBegin to PackEnd. |
| struct stbtt_pack_context { |
| void *user_allocator_context; |
| void *pack_info; |
| int width; |
| int height; |
| int stride_in_bytes; |
| int padding; |
| int skip_missing; |
| unsigned int h_oversample, v_oversample; |
| unsigned char *pixels; |
| void *nodes; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // FONT LOADING |
| // |
| // |
| |
| STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data); |
| // This function will determine the number of fonts in a font file. TrueType |
| // collection (.ttc) files may contain multiple fonts, while TrueType font |
| // (.ttf) files only contain one font. The number of fonts can be used for |
| // indexing with the previous function where the index is between zero and one |
| // less than the total fonts. If an error occurs, -1 is returned. |
| |
| STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index); |
| // Each .ttf/.ttc file may have more than one font. Each font has a sequential |
| // index number starting from 0. Call this function to get the font offset for |
| // a given index; it returns -1 if the index is out of range. A regular .ttf |
| // file will only define one font and it always be at offset 0, so it will |
| // return '0' for index 0, and -1 for all other indices. |
| |
| // The following structure is defined publicly so you can declare one on |
| // the stack or as a global or etc, but you should treat it as opaque. |
| 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,gpos,svg; // 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__buf cff; // cff font data |
| stbtt__buf charstrings; // the charstring index |
| stbtt__buf gsubrs; // global charstring subroutines index |
| stbtt__buf subrs; // private charstring subroutines index |
| stbtt__buf fontdicts; // array of font dicts |
| stbtt__buf fdselect; // map from glyph to fontdict |
| }; |
| |
| STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset); |
| // Given an offset into the file that defines a font, this function builds |
| // the necessary cached info for the rest of the system. You must allocate |
| // the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't |
| // need to do anything special to free it, because the contents are pure |
| // value data with no additional data structures. Returns 0 on failure. |
| |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // CHARACTER TO GLYPH-INDEX CONVERSIOn |
| |
| STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint); |
| // If you're going to perform multiple operations on the same character |
| // and you want a speed-up, call this function with the character you're |
| // going to process, then use glyph-based functions instead of the |
| // codepoint-based functions. |
| // Returns 0 if the character codepoint is not defined in the font. |
| |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // CHARACTER PROPERTIES |
| // |
| |
| STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels); |
| // computes a scale factor to produce a font whose "height" is 'pixels' tall. |
| // Height is measured as the distance from the highest ascender to the lowest |
| // descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics |
| // and computing: |
| // scale = pixels / (ascent - descent) |
| // so if you prefer to measure height by the ascent only, use a similar calculation. |
| |
| STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels); |
| // computes a scale factor to produce a font whose EM size is mapped to |
| // 'pixels' tall. This is probably what traditional APIs compute, but |
| // I'm not positive. |
| |
| STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap); |
| // ascent is the coordinate above the baseline the font extends; descent |
| // is the coordinate below the baseline the font extends (i.e. it is typically negative) |
| // lineGap is the spacing between one row's descent and the next row's ascent... |
| // so you should advance the vertical position by "*ascent - *descent + *lineGap" |
| // these are expressed in unscaled coordinates, so you must multiply by |
| // the scale factor for a given size |
| |
| STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap); |
| // analogous to GetFontVMetrics, but returns the "typographic" values from the OS/2 |
| // table (specific to MS/Windows TTF files). |
| // |
| // Returns 1 on success (table present), 0 on failure. |
| |
| STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1); |
| // the bounding box around all possible characters |
| |
| STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing); |
| // leftSideBearing is the offset from the current horizontal position to the left edge of the character |
| // advanceWidth is the offset from the current horizontal position to the next horizontal position |
| // these are expressed in unscaled coordinates |
| |
| STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2); |
| // an additional amount to add to the 'advance' value between ch1 and ch2 |
| |
| STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1); |
| // Gets the bounding box of the visible part of the glyph, in unscaled coordinates |
| |
| STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing); |
| STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2); |
| STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1); |
| // as above, but takes one or more glyph indices for greater efficiency |
| |
| typedef struct stbtt_kerningentry |
| { |
| int glyph1; // use stbtt_FindGlyphIndex |
| int glyph2; |
| int advance; |
| } stbtt_kerningentry; |
| |
| STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info); |
| STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length); |
| // Retrieves a complete list of all of the kerning pairs provided by the font |
| // stbtt_GetKerningTable never writes more than table_length entries and returns how many entries it did write. |
| // The table will be sorted by (a.glyph1 == b.glyph1)?(a.glyph2 < b.glyph2):(a.glyph1 < b.glyph1) |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // 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, |
| STBTT_vcubic |
| }; |
| #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,cx1,cy1; |
| unsigned char type,padding; |
| } stbtt_vertex; |
| #endif |
| |
| STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index); |
| // returns non-zero if nothing is drawn for this glyph |
| |
| STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices); |
| STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices); |
| // returns # of vertices and fills *vertices with the pointer to them |
| // these are expressed in "unscaled" coordinates |
| // |
| // The shape is a series of contours. Each one starts with |
| // a STBTT_moveto, then consists of a series of mixed |
| // STBTT_lineto and STBTT_curveto segments. A lineto |
| // draws a line from previous endpoint to its x,y; a curveto |
| // draws a quadratic bezier from previous endpoint to |
| // its x,y, using cx,cy as the bezier control point. |
| |
| STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices); |
| // frees the data allocated above |
| |
| STBTT_DEF unsigned char *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl); |
| STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg); |
| STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg); |
| // fills svg with the character's SVG data. |
| // returns data size or 0 if SVG not found. |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // BITMAP RENDERING |
| // |
| |
| STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata); |
| // frees the bitmap allocated below |
| |
| STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff); |
| // allocates a large-enough single-channel 8bpp bitmap and renders the |
| // specified character/glyph at the specified scale into it, with |
| // antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque). |
| // *width & *height are filled out with the width & height of the bitmap, |
| // which is stored left-to-right, top-to-bottom. |
| // |
| // xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap |
| |
| STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff); |
| // the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel |
| // shift for the character |
| |
| STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint); |
| // the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap |
| // in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap |
| // is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the |
| // width and height and positioning info for it first. |
| |
| STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint); |
| // same as stbtt_MakeCodepointBitmap, but you can specify a subpixel |
| // shift for the character |
| |
| STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(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 oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint); |
| // same as stbtt_MakeCodepointBitmapSubpixel, but prefiltering |
| // is performed (see stbtt_PackSetOversampling) |
| |
| STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1); |
| // get the bbox of the bitmap centered around the glyph origin; so the |
| // bitmap width is ix1-ix0, height is iy1-iy0, and location to place |
| // the bitmap top left is (leftSideBearing*scale,iy0). |
| // (Note that the bitmap uses y-increases-down, but the shape uses |
| // y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.) |
| |
| STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1); |
| // same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel |
| // shift for the character |
| |
| // the following functions are equivalent to the above functions, but operate |
| // on glyph indices instead of Unicode codepoints (for efficiency) |
| STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff); |
| STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff); |
| STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph); |
| STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph); |
| STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(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 oversample_x, int oversample_y, float *sub_x, float *sub_y, int glyph); |
| STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1); |
| STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1); |
| |
| |
| // @TODO: don't expose this structure |
| typedef struct |
| { |
| int w,h,stride; |
| unsigned char *pixels; |
| } stbtt__bitmap; |
| |
| // rasterize a shape with quadratic beziers into a bitmap |
| STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, // 1-channel bitmap to draw into |
| float flatness_in_pixels, // allowable error of curve in pixels |
| stbtt_vertex *vertices, // array of vertices defining shape |
| int num_verts, // number of vertices in above array |
| float scale_x, float scale_y, // scale applied to input vertices |
| float shift_x, float shift_y, // translation applied to input vertices |
| int x_off, int y_off, // another translation applied to input |
| int invert, // if non-zero, vertically flip shape |
| void *userdata); // context for to STBTT_MALLOC |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // Signed Distance Function (or Field) rendering |
| |
| STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata); |
| // frees the SDF bitmap allocated below |
| |
| STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff); |
| STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff); |
| // These functions compute a discretized SDF field for a single character, suitable for storing |
| // in a single-channel texture, sampling with bilinear filtering, and testing against |
| // larger than some threshold to produce scalable fonts. |
| // info -- the font |
| // scale -- controls the size of the resulting SDF bitmap, same as it would be creating a regular bitmap |
| // glyph/codepoint -- the character to generate the SDF for |
| // padding -- extra "pixels" around the character which are filled with the distance to the character (not 0), |
| // which allows effects like bit outlines |
| // onedge_value -- value 0-255 to test the SDF against to reconstruct the character (i.e. the isocontour of the character) |
| // pixel_dist_scale -- what value the SDF should increase by when moving one SDF "pixel" away from the edge (on the 0..255 scale) |
| // if positive, > onedge_value is inside; if negative, < onedge_value is inside |
| // width,height -- output height & width of the SDF bitmap (including padding) |
| // xoff,yoff -- output origin of the character |
| // return value -- a 2D array of bytes 0..255, width*height in size |
| // |
| // pixel_dist_scale & onedge_value are a scale & bias that allows you to make |
| // optimal use of the limited 0..255 for your application, trading off precision |
| // and special effects. SDF values outside the range 0..255 are clamped to 0..255. |
| // |
| // Example: |
| // scale = stbtt_ScaleForPixelHeight(22) |
| // padding = 5 |
| // onedge_value = 180 |
| // pixel_dist_scale = 180/5.0 = 36.0 |
| // |
| // This will create an SDF bitmap in which the character is about 22 pixels |
| // high but the whole bitmap is about 22+5+5=32 pixels high. To produce a filled |
| // shape, sample the SDF at each pixel and fill the pixel if the SDF value |
| // is greater than or equal to 180/255. (You'll actually want to antialias, |
| // which is beyond the scope of this example.) Additionally, you can compute |
| // offset outlines (e.g. to stroke the character border inside & outside, |
| // or only outside). For example, to fill outside the character up to 3 SDF |
| // pixels, you would compare against (180-36.0*3)/255 = 72/255. The above |
| // choice of variables maps a range from 5 pixels outside the shape to |
| // 2 pixels inside the shape to 0..255; this is intended primarily for apply |
| // outside effects only (the interior range is needed to allow proper |
| // antialiasing of the font at *smaller* sizes) |
| // |
| // The function computes the SDF analytically at each SDF pixel, not by e.g. |
| // building a higher-res bitmap and approximating it. In theory the quality |
| // should be as high as possible for an SDF of this size & representation, but |
| // unclear if this is true in practice (perhaps building a higher-res bitmap |
| // and computing from that can allow drop-out prevention). |
| // |
| // The algorithm has not been optimized at all, so expect it to be slow |
| // if computing lots of characters or very large sizes. |
| |
| |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // Finding the right font... |
| // |
| // You should really just solve this offline, keep your own tables |
| // of what font is what, and don't try to get it out of the .ttf file. |
| // That's because getting it out of the .ttf file is really hard, because |
| // the names in the file can appear in many possible encodings, in many |
| // possible languages, and e.g. if you need a case-insensitive comparison, |
| // the details of that depend on the encoding & language in a complex way |
| // (actually underspecified in truetype, but also gigantic). |
| // |
| // But you can use the provided functions in two possible ways: |
| // stbtt_FindMatchingFont() will use *case-sensitive* comparisons on |
| // unicode-encoded names to try to find the font you want; |
| // you can run this before calling stbtt_InitFont() |
| // |
| // stbtt_GetFontNameString() lets you get any of the various strings |
| // from the file yourself and do your own comparisons on them. |
| // You have to have called stbtt_InitFont() first. |
| |
| |
| STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags); |
| // returns the offset (not index) of the font that matches, or -1 if none |
| // if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold". |
| // if you use any other flag, use a font name like "Arial"; this checks |
| // the 'macStyle' header field; i don't know if fonts set this consistently |
| #define STBTT_MACSTYLE_DONTCARE 0 |
| #define STBTT_MACSTYLE_BOLD 1 |
| #define STBTT_MACSTYLE_ITALIC 2 |
| #define STBTT_MACSTYLE_UNDERSCORE 4 |
| #define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us check the bitfield is 0 |
| |
| STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2); |
| // returns 1/0 whether the first string interpreted as utf8 is identical to |
| // the second string interpreted as big-endian utf16... useful for strings from next func |
| |
| STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID); |
| // returns the string (which may be big-endian double byte, e.g. for unicode) |
| // and puts the length in bytes in *length. |
| // |
| // some of the values for the IDs are below; for more see the truetype spec: |
| // http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html |
| // http://www.microsoft.com/typography/otspec/name.htm |
| |
| enum { // platformID |
| STBTT_PLATFORM_ID_UNICODE =0, |
| STBTT_PLATFORM_ID_MAC =1, |
| STBTT_PLATFORM_ID_ISO =2, |
| STBTT_PLATFORM_ID_MICROSOFT =3 |
| }; |
| |
| enum { // encodingID for STBTT_PLATFORM_ID_UNICODE |
| STBTT_UNICODE_EID_UNICODE_1_0 =0, |
| STBTT_UNICODE_EID_UNICODE_1_1 =1, |
| STBTT_UNICODE_EID_ISO_10646 =2, |
| STBTT_UNICODE_EID_UNICODE_2_0_BMP=3, |
| STBTT_UNICODE_EID_UNICODE_2_0_FULL=4 |
| }; |
| |
| enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT |
| STBTT_MS_EID_SYMBOL =0, |
| STBTT_MS_EID_UNICODE_BMP =1, |
| STBTT_MS_EID_SHIFTJIS =2, |
| STBTT_MS_EID_UNICODE_FULL =10 |
| }; |
| |
| enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes |
| STBTT_MAC_EID_ROMAN =0, STBTT_MAC_EID_ARABIC =4, |
| STBTT_MAC_EID_JAPANESE =1, STBTT_MAC_EID_HEBREW =5, |
| STBTT_MAC_EID_CHINESE_TRAD =2, STBTT_MAC_EID_GREEK =6, |
| STBTT_MAC_EID_KOREAN =3, STBTT_MAC_EID_RUSSIAN =7 |
| }; |
| |
| enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID... |
| // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs |
| STBTT_MS_LANG_ENGLISH =0x0409, STBTT_MS_LANG_ITALIAN =0x0410, |
| STBTT_MS_LANG_CHINESE =0x0804, STBTT_MS_LANG_JAPANESE =0x0411, |
| STBTT_MS_LANG_DUTCH =0x0413, STBTT_MS_LANG_KOREAN =0x0412, |
| STBTT_MS_LANG_FRENCH =0x040c, STBTT_MS_LANG_RUSSIAN =0x0419, |
| STBTT_MS_LANG_GERMAN =0x0407, STBTT_MS_LANG_SPANISH =0x0409, |
| STBTT_MS_LANG_HEBREW =0x040d, STBTT_MS_LANG_SWEDISH =0x041D |
| }; |
| |
| enum { // languageID for STBTT_PLATFORM_ID_MAC |
| STBTT_MAC_LANG_ENGLISH =0 , STBTT_MAC_LANG_JAPANESE =11, |
| STBTT_MAC_LANG_ARABIC =12, STBTT_MAC_LANG_KOREAN =23, |
| STBTT_MAC_LANG_DUTCH =4 , STBTT_MAC_LANG_RUSSIAN =32, |
| STBTT_MAC_LANG_FRENCH =1 , STBTT_MAC_LANG_SPANISH =6 , |
| STBTT_MAC_LANG_GERMAN =2 , STBTT_MAC_LANG_SWEDISH =5 , |
| STBTT_MAC_LANG_HEBREW =10, STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33, |
| STBTT_MAC_LANG_ITALIAN =3 , STBTT_MAC_LANG_CHINESE_TRAD =19 |
| }; |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif // __STB_INCLUDE_STB_TRUETYPE_H__ |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////// |
| //// |
| //// IMPLEMENTATION |
| //// |
| //// |
| |
| #ifdef STB_TRUETYPE_IMPLEMENTATION |
| |
| #ifndef STBTT_MAX_OVERSAMPLE |
| #define STBTT_MAX_OVERSAMPLE 8 |
| #endif |
| |
| #if STBTT_MAX_OVERSAMPLE > 255 |
| #error "STBTT_MAX_OVERSAMPLE cannot be > 255" |
| #endif |
| |
| typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1]; |
| |
| #ifndef STBTT_RASTERIZER_VERSION |
| #define STBTT_RASTERIZER_VERSION 2 |
| #endif |
| |
| #ifdef _MSC_VER |
| #define STBTT__NOTUSED(v) (void)(v) |
| #else |
| #define STBTT__NOTUSED(v) (void)sizeof(v) |
| #endif |
| |
| ////////////////////////////////////////////////////////////////////////// |
| // |
| // stbtt__buf helpers to parse data from file |
| // |
| |
| static stbtt_uint8 stbtt__buf_get8(stbtt__buf *b) |
| { |
| if (b->cursor >= b->size) |
| return 0; |
| return b->data[b->cursor++]; |
| } |
| |
| static stbtt_uint8 stbtt__buf_peek8(stbtt__buf *b) |
| { |
| if (b->cursor >= b->size) |
| return 0; |
| return b->data[b->cursor]; |
| } |
| |
| static void stbtt__buf_seek(stbtt__buf *b, int o) |
| { |
| STBTT_assert(!(o > b->size || o < 0)); |
| b->cursor = (o > b->size || o < 0) ? b->size : o; |
| } |
| |
| static void stbtt__buf_skip(stbtt__buf *b, int o) |
| { |
| stbtt__buf_seek(b, b->cursor + o); |
| } |
| |
| static stbtt_uint32 stbtt__buf_get(stbtt__buf *b, int n) |
| { |
| stbtt_uint32 v = 0; |
| int i; |
| STBTT_assert(n >= 1 && n <= 4); |
| for (i = 0; i < n; i++) |
| v = (v << 8) | stbtt__buf_get8(b); |
| return v; |
| } |
| |
| static stbtt__buf stbtt__new_buf(const void *p, size_t size) |
| { |
| stbtt__buf r; |
| STBTT_assert(size < 0x40000000); |
| r.data = (stbtt_uint8*) p; |
| r.size = (int) size; |
| r.cursor = 0; |
| return r; |
| } |
| |
| #define stbtt__buf_get16(b) stbtt__buf_get((b), 2) |
| #define stbtt__buf_get32(b) stbtt__buf_get((b), 4) |
| |
| static stbtt__buf stbtt__buf_range(const stbtt__buf *b, int o, int s) |
| { |
| stbtt__buf r = stbtt__new_buf(NULL, 0); |
| if (o < 0 || s < 0 || o > b->size || s > b->size - o) return r; |
| r.data = b->data + o; |
| r.size = s; |
| return r; |
| } |
| |
| static stbtt__buf stbtt__cff_get_index(stbtt__buf *b) |
| { |
| int count, start, offsize; |
| start = b->cursor; |
| count = stbtt__buf_get16(b); |
| if (count) { |
| offsize = stbtt__buf_get8(b); |
| STBTT_assert(offsize >= 1 && offsize <= 4); |
| stbtt__buf_skip(b, offsize * count); |
| stbtt__buf_skip(b, stbtt__buf_get(b, offsize) - 1); |
| } |
| return stbtt__buf_range(b, start, b->cursor - start); |
| } |
| |
| static stbtt_uint32 stbtt__cff_int(stbtt__buf *b) |
| { |
| int b0 = stbtt__buf_get8(b); |
| if (b0 >= 32 && b0 <= 246) return b0 - 139; |
| else if (b0 >= 247 && b0 <= 250) return (b0 - 247)*256 + stbtt__buf_get8(b) + 108; |
| else if (b0 >= 251 && b0 <= 254) return -(b0 - 251)*256 - stbtt__buf_get8(b) - 108; |
| else if (b0 == 28) return stbtt__buf_get16(b); |
| else if (b0 == 29) return stbtt__buf_get32(b); |
| STBTT_assert(0); |
| return 0; |
| } |
| |
| static void stbtt__cff_skip_operand(stbtt__buf *b) { |
| int v, b0 = stbtt__buf_peek8(b); |
| STBTT_assert(b0 >= 28); |
| if (b0 == 30) { |
| stbtt__buf_skip(b, 1); |
| while (b->cursor < b->size) { |
| v = stbtt__buf_get8(b); |
| if ((v & 0xF) == 0xF || (v >> 4) == 0xF) |
| break; |
| } |
| } else { |
| stbtt__cff_int(b); |
| } |
| } |
| |
| static stbtt__buf stbtt__dict_get(stbtt__buf *b, int key) |
| { |
| stbtt__buf_seek(b, 0); |
| while (b->cursor < b->size) { |
| int start = b->cursor, end, op; |
| while (stbtt__buf_peek8(b) >= 28) |
| stbtt__cff_skip_operand(b); |
| end = b->cursor; |
| op = stbtt__buf_get8(b); |
| if (op == 12) op = stbtt__buf_get8(b) | 0x100; |
| if (op == key) return stbtt__buf_range(b, start, end-start); |
| } |
| return stbtt__buf_range(b, 0, 0); |
| } |
| |
| static void stbtt__dict_get_ints(stbtt__buf *b, int key, int outcount, stbtt_uint32 *out) |
| { |
| int i; |
| stbtt__buf operands = stbtt__dict_get(b, key); |
| for (i = 0; i < outcount && operands.cursor < operands.size; i++) |
| out[i] = stbtt__cff_int(&operands); |
| } |
| |
| static int stbtt__cff_index_count(stbtt__buf *b) |
| { |
| stbtt__buf_seek(b, 0); |
| return stbtt__buf_get16(b); |
| } |
| |
| static stbtt__buf stbtt__cff_index_get(stbtt__buf b, int i) |
| { |
| int count, offsize, start, end; |
| stbtt__buf_seek(&b, 0); |
| count = stbtt__buf_get16(&b); |
| offsize = stbtt__buf_get8(&b); |
| STBTT_assert(i >= 0 && i < count); |
| STBTT_assert(offsize >= 1 && offsize <= 4); |
| stbtt__buf_skip(&b, i*offsize); |
| start = stbtt__buf_get(&b, offsize); |
| end = stbtt__buf_get(&b, offsize); |
| return stbtt__buf_range(&b, 2+(count+1)*offsize+start, end - start); |
| } |
| |
| ////////////////////////////////////////////////////////////////////////// |
| // |
| // 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) |
| |
| static stbtt_uint16 ttUSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; } |
| static stbtt_int16 ttSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; } |
| static stbtt_uint32 ttULONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; } |
| static stbtt_int32 ttLONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; } |
| |
| #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(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 |
| if (stbtt_tag(font, "true")) return 1; // Apple specification for TrueType fonts |
| 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; |
| } |
| |
| static int stbtt_GetFontOffsetForIndex_internal(unsigned char *font_collection, int index) |
| { |
| // if it's just a font, there's only one valid index |
| if (stbtt__isfont(font_collection)) |
| return index == 0 ? 0 : -1; |
| |
| // check if it's a TTC |
| if (stbtt_tag(font_collection, "ttcf")) { |
| // version 1? |
| if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) { |
| stbtt_int32 n = ttLONG(font_collection+8); |
| if (index >= n) |
| return -1; |
| return ttULONG(font_collection+12+index*4); |
| } |
| } |
| return -1; |
| } |
| |
| static int stbtt_GetNumberOfFonts_internal(unsigned char *font_collection) |
| { |
| // if it's just a font, there's only one valid font |
| if (stbtt__isfont(font_collection)) |
| return 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) { |
| return ttLONG(font_collection+8); |
| } |
| } |
| return 0; |
| } |
| |
| static stbtt__buf stbtt__get_subrs(stbtt__buf cff, stbtt__buf fontdict) |
| { |
| stbtt_uint32 subrsoff = 0, private_loc[2] = { 0, 0 }; |
| stbtt__buf pdict; |
| stbtt__dict_get_ints(&fontdict, 18, 2, private_loc); |
| if (!private_loc[1] || !private_loc[0]) return stbtt__new_buf(NULL, 0); |
| pdict = stbtt__buf_range(&cff, private_loc[1], private_loc[0]); |
| stbtt__dict_get_ints(&pdict, 19, 1, &subrsoff); |
| if (!subrsoff) return stbtt__new_buf(NULL, 0); |
| stbtt__buf_seek(&cff, private_loc[1]+subrsoff); |
| return stbtt__cff_get_index(&cff); |
| } |
| |
| // since most people won't use this, find this table the first time it's needed |
| static int stbtt__get_svg(stbtt_fontinfo *info) |
| { |
| stbtt_uint32 t; |
| if (info->svg < 0) { |
| t = stbtt__find_table(info->data, info->fontstart, "SVG "); |
| if (t) { |
| stbtt_uint32 offset = ttULONG(info->data + t + 2); |
| info->svg = t + offset; |
| } else { |
| info->svg = 0; |
| } |
| } |
| return info->svg; |
| } |
| |
| static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart) |
| { |
| stbtt_uint32 cmap, t; |
| stbtt_int32 i,numTables; |
| |
| info->data = data; |
| info->fontstart = fontstart; |
| info->cff = stbtt__new_buf(NULL, 0); |
| |
| 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 |
| info->gpos = stbtt__find_table(data, fontstart, "GPOS"); // not required |
| |
| if (!cmap || !info->head || !info->hhea || !info->hmtx) |
| return 0; |
| if (info->glyf) { |
| // required for truetype |
| if (!info->loca) return 0; |
| } else { |
| // initialization for CFF / Type2 fonts (OTF) |
| stbtt__buf b, topdict, topdictidx; |
| stbtt_uint32 cstype = 2, charstrings = 0, fdarrayoff = 0, fdselectoff = 0; |
| stbtt_uint32 cff; |
| |
| cff = stbtt__find_table(data, fontstart, "CFF "); |
| if (!cff) return 0; |
| |
| info->fontdicts = stbtt__new_buf(NULL, 0); |
| info->fdselect = stbtt__new_buf(NULL, 0); |
| |
| // @TODO this should use size from table (not 512MB) |
| info->cff = stbtt__new_buf(data+cff, 512*1024*1024); |
| b = info->cff; |
| |
| // read the header |
| stbtt__buf_skip(&b, 2); |
| stbtt__buf_seek(&b, stbtt__buf_get8(&b)); // hdrsize |
| |
| // @TODO the name INDEX could list multiple fonts, |
| // but we just use the first one. |
| stbtt__cff_get_index(&b); // name INDEX |
| topdictidx = stbtt__cff_get_index(&b); |
| topdict = stbtt__cff_index_get(topdictidx, 0); |
| stbtt__cff_get_index(&b); // string INDEX |
| info->gsubrs = stbtt__cff_get_index(&b); |
| |
| stbtt__dict_get_ints(&topdict, 17, 1, &charstrings); |
| stbtt__dict_get_ints(&topdict, 0x100 | 6, 1, &cstype); |
| stbtt__dict_get_ints(&topdict, 0x100 | 36, 1, &fdarrayoff); |
| stbtt__dict_get_ints(&topdict, 0x100 | 37, 1, &fdselectoff); |
| info->subrs = stbtt__get_subrs(b, topdict); |
| |
| // we only support Type 2 charstrings |
| if (cstype != 2) return 0; |
| if (charstrings == 0) return 0; |
| |
| if (fdarrayoff) { |
| // looks like a CID font |
| if (!fdselectoff) return 0; |
| stbtt__buf_seek(&b, fdarrayoff); |
| info->fontdicts = stbtt__cff_get_index(&b); |
| info->fdselect = stbtt__buf_range(&b, fdselectoff, b.size-fdselectoff); |
| } |
| |
| stbtt__buf_seek(&b, charstrings); |
| info->charstrings = stbtt__cff_get_index(&b); |
| } |
| |
| t = stbtt__find_table(data, fontstart, "maxp"); |
| if (t) |
| info->numGlyphs = ttUSHORT(data+t+4); |
| else |
| info->numGlyphs = 0xffff; |
| |
| info->svg = -1; |
| |
| // find a cmap encoding table we understand *now* to avoid searching |
| // later. (todo: could make this installable) |
| // the same regardless of glyph. |
| numTables = ttUSHORT(data + cmap + 2); |
| info->index_map = 0; |
| for (i=0; i < numTables; ++i) { |
| stbtt_uint32 encoding_record = cmap + 4 + 8 * i; |
| // find an encoding we understand: |
| switch(ttUSHORT(data+encoding_record)) { |
| case STBTT_PLATFORM_ID_MICROSOFT: |
| switch (ttUSHORT(data+encoding_record+2)) { |
| case STBTT_MS_EID_UNICODE_BMP: |
| case STBTT_MS_EID_UNICODE_FULL: |
| // MS/Unicode |
| info->index_map = cmap + ttULONG(data+encoding_record+4); |
| break; |
| } |
| break; |
| case STBTT_PLATFORM_ID_UNICODE: |
| // Mac/iOS has these |
| // all the encodingIDs are unicode, so we don't bother to check it |
| info->index_map = cmap + ttULONG(data+encoding_record+4); |
| break; |
| } |
| } |
| if (info->index_map == 0) |
| return 0; |
| |
| info->indexToLocFormat = ttUSHORT(data+info->head + 50); |
| return 1; |
| } |
| |
| STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint) |
| { |
| stbtt_uint8 *data = info->data; |
| stbtt_uint32 index_map = info->index_map; |
| |
| stbtt_uint16 format = ttUSHORT(data + index_map + 0); |
| if (format == 0) { // apple byte encoding |
| stbtt_int32 bytes = ttUSHORT(data + index_map + 2); |
| if (unicode_codepoint < bytes-6) |
| return ttBYTE(data + index_map + 6 + unicode_codepoint); |
| return 0; |
| } else if (format == 6) { |
| stbtt_uint32 first = ttUSHORT(data + index_map + 6); |
| stbtt_uint32 count = ttUSHORT(data + index_map + 8); |
| if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count) |
| return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2); |
| return 0; |
| } else if (format == 2) { |
| STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean |
| return 0; |
| } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges |
| stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1; |
| stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1; |
| stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10); |
| stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1; |
| |
| // do a binary search of the segments |
| stbtt_uint32 endCount = index_map + 14; |
| stbtt_uint32 search = endCount; |
| |
| if (unicode_codepoint > 0xffff) |
| return 0; |
| |
| // they lie from endCount .. endCount + segCount |
| // but searchRange is the nearest power of two, so... |
| if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2)) |
| search += rangeShift*2; |
| |
| // now decrement to bias correctly to find smallest |
| search -= 2; |
| while (entrySelector) { |
| stbtt_uint16 end; |
| searchRange >>= 1; |
| end = ttUSHORT(data + search + searchRange*2); |
| if (unicode_codepoint > end) |
| search += searchRange*2; |
| --entrySelector; |
| } |
| search += 2; |
| |
| { |
| stbtt_uint16 offset, start, last; |
| stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1); |
| |
| start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item); |
| last = ttUSHORT(data + endCount + 2*item); |
| if (unicode_codepoint < start || unicode_codepoint > last) |
| return 0; |
| |
| offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item); |
| if (offset == 0) |
| return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item)); |
| |
| return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item); |
| } |
| } else if (format == 12 || format == 13) { |
| stbtt_uint32 ngroups = ttULONG(data+index_map+12); |
| stbtt_int32 low,high; |
| low = 0; high = (stbtt_int32)ngroups; |
| // Binary search the right group. |
| while (low < high) { |
| stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high |
| stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12); |
| stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4); |
| if ((stbtt_uint32) unicode_codepoint < start_char) |
| high = mid; |
| else if ((stbtt_uint32) unicode_codepoint > end_char) |
| low = mid+1; |
| else { |
| stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8); |
| if (format == 12) |
| return start_glyph + unicode_codepoint-start_char; |
| else // format == 13 |
| return start_glyph; |
| } |
| } |
| return 0; // not found |
| } |
| // @TODO |
| STBTT_assert(0); |
| return 0; |
| } |
| |
| STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices) |
| { |
| return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices); |
| } |
| |
| static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy) |
| { |
| v->type = type; |
| v->x = (stbtt_int16) x; |
| v->y = (stbtt_int16) y; |
| v->cx = (stbtt_int16) cx; |
| v->cy = (stbtt_int16) cy; |
| } |
| |
| static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index) |
| { |
| int g1,g2; |
| |
| STBTT_assert(!info->cff.size); |
| |
| 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 |
| } |
| |
| static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1); |
| |
| STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1) |
| { |
| if (info->cff.size) { |
| stbtt__GetGlyphInfoT2(info, glyph_index, x0, y0, x1, y1); |
| } else { |
| int g = stbtt__GetGlyfOffset(info, glyph_index); |
| if (g < 0) return 0; |
| |
| if (x0) *x0 = ttSHORT(info->data + g + 2); |
| if (y0) *y0 = ttSHORT(info->data + g + 4); |
| if (x1) *x1 = ttSHORT(info->data + g + 6); |
| if (y1) *y1 = ttSHORT(info->data + g + 8); |
| } |
| return 1; |
| } |
| |
| STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1) |
| { |
| return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1); |
| } |
| |
| STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index) |
| { |
| stbtt_int16 numberOfContours; |
| int g; |
| if (info->cff.size) |
| return stbtt__GetGlyphInfoT2(info, glyph_index, NULL, NULL, NULL, NULL) == 0; |
| 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; |
| } |
| |
| static int stbtt__GetGlyphShapeTT(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 < 0) { |
| // 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 && vertices) 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 { |
| // numberOfCounters == 0, do nothing |
| } |
| |
| *pvertices = vertices; |
| return num_vertices; |
| } |
| |
| typedef struct |
| { |
| int bounds; |
| int started; |
| float first_x, first_y; |
| float x, y; |
| stbtt_int32 min_x, max_x, min_y, max_y; |
| |
| stbtt_vertex *pvertices; |
| int num_vertices; |
| } stbtt__csctx; |
| |
| #define STBTT__CSCTX_INIT(bounds) {bounds,0, 0,0, 0,0, 0,0,0,0, NULL, 0} |
| |
| static void stbtt__track_vertex(stbtt__csctx *c, stbtt_int32 x, stbtt_int32 y) |
| { |
| if (x > c->max_x || !c->started) c->max_x = x; |
| if (y > c->max_y || !c->started) c->max_y = y; |
| if (x < c->min_x || !c->started) c->min_x = x; |
| if (y < c->min_y || !c->started) c->min_y = y; |
| c->started = 1; |
| } |
| |
| static void stbtt__csctx_v(stbtt__csctx *c, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy, stbtt_int32 cx1, stbtt_int32 cy1) |
| { |
| if (c->bounds) { |
| stbtt__track_vertex(c, x, y); |
| if (type == STBTT_vcubic) { |
| stbtt__track_vertex(c, cx, cy); |
| stbtt__track_vertex(c, cx1, cy1); |
| } |
| } else { |
| stbtt_setvertex(&c->pvertices[c->num_vertices], type, x, y, cx, cy); |
| c->pvertices[c->num_vertices].cx1 = (stbtt_int16) cx1; |
| c->pvertices[c->num_vertices].cy1 = (stbtt_int16) cy1; |
| } |
| c->num_vertices++; |
| } |
| |
| static void stbtt__csctx_close_shape(stbtt__csctx *ctx) |
| { |
| if (ctx->first_x != ctx->x || ctx->first_y != ctx->y) |
| stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->first_x, (int)ctx->first_y, 0, 0, 0, 0); |
| } |
| |
| static void stbtt__csctx_rmove_to(stbtt__csctx *ctx, float dx, float dy) |
| { |
| stbtt__csctx_close_shape(ctx); |
| ctx->first_x = ctx->x = ctx->x + dx; |
| ctx->first_y = ctx->y = ctx->y + dy; |
| stbtt__csctx_v(ctx, STBTT_vmove, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0); |
| } |
| |
| static void stbtt__csctx_rline_to(stbtt__csctx *ctx, float dx, float dy) |
| { |
| ctx->x += dx; |
| ctx->y += dy; |
| stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0); |
| } |
| |
| static void stbtt__csctx_rccurve_to(stbtt__csctx *ctx, float dx1, float dy1, float dx2, float dy2, float dx3, float dy3) |
| { |
| float cx1 = ctx->x + dx1; |
| float cy1 = ctx->y + dy1; |
| float cx2 = cx1 + dx2; |
| float cy2 = cy1 + dy2; |
| ctx->x = cx2 + dx3; |
| ctx->y = cy2 + dy3; |
| stbtt__csctx_v(ctx, STBTT_vcubic, (int)ctx->x, (int)ctx->y, (int)cx1, (int)cy1, (int)cx2, (int)cy2); |
| } |
| |
| static stbtt__buf stbtt__get_subr(stbtt__buf idx, int n) |
| { |
| int count = stbtt__cff_index_count(&idx); |
| int bias = 107; |
| if (count >= 33900) |
| bias = 32768; |
| else if (count >= 1240) |
| bias = 1131; |
| n += bias; |
| if (n < 0 || n >= count) |
| return stbtt__new_buf(NULL, 0); |
| return stbtt__cff_index_get(idx, n); |
| } |
| |
| static stbtt__buf stbtt__cid_get_glyph_subrs(const stbtt_fontinfo *info, int glyph_index) |
| { |
| stbtt__buf fdselect = info->fdselect; |
| int nranges, start, end, v, fmt, fdselector = -1, i; |
| |
| stbtt__buf_seek(&fdselect, 0); |
| fmt = stbtt__buf_get8(&fdselect); |
| if (fmt == 0) { |
| // untested |
| stbtt__buf_skip(&fdselect, glyph_index); |
| fdselector = stbtt__buf_get8(&fdselect); |
| } else if (fmt == 3) { |
| nranges = stbtt__buf_get16(&fdselect); |
| start = stbtt__buf_get16(&fdselect); |
| for (i = 0; i < nranges; i++) { |
| v = stbtt__buf_get8(&fdselect); |
| end = stbtt__buf_get16(&fdselect); |
| if (glyph_index >= start && glyph_index < end) { |
| fdselector = v; |
| break; |
| } |
| start = end; |
| } |
| } |
| if (fdselector == -1) return stbtt__new_buf(NULL, 0); // [DEAR IMGUI] fixed, see #6007 and nothings/stb#1422 |
| return stbtt__get_subrs(info->cff, stbtt__cff_index_get(info->fontdicts, fdselector)); |
| } |
| |
| static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, stbtt__csctx *c) |
| { |
| int in_header = 1, maskbits = 0, subr_stack_height = 0, sp = 0, v, i, b0; |
| int has_subrs = 0, clear_stack; |
| float s[48]; |
| stbtt__buf subr_stack[10], subrs = info->subrs, b; |
| float f; |
| |
| #define STBTT__CSERR(s) (0) |
| |
| // this currently ignores the initial width value, which isn't needed if we have hmtx |
| b = stbtt__cff_index_get(info->charstrings, glyph_index); |
| while (b.cursor < b.size) { |
| i = 0; |
| clear_stack = 1; |
| b0 = stbtt__buf_get8(&b); |
| switch (b0) { |
| // @TODO implement hinting |
| case 0x13: // hintmask |
| case 0x14: // cntrmask |
| if (in_header) |
| maskbits += (sp / 2); // implicit "vstem" |
| in_header = 0; |
| stbtt__buf_skip(&b, (maskbits + 7) / 8); |
| break; |
| |
| case 0x01: // hstem |
| case 0x03: // vstem |
| case 0x12: // hstemhm |
| case 0x17: // vstemhm |
| maskbits += (sp / 2); |
| break; |
| |
| case 0x15: // rmoveto |
| in_header = 0; |
| if (sp < 2) return STBTT__CSERR("rmoveto stack"); |
| stbtt__csctx_rmove_to(c, s[sp-2], s[sp-1]); |
| break; |
| case 0x04: // vmoveto |
| in_header = 0; |
| if (sp < 1) return STBTT__CSERR("vmoveto stack"); |
| stbtt__csctx_rmove_to(c, 0, s[sp-1]); |
| break; |
| case 0x16: // hmoveto |
| in_header = 0; |
| if (sp < 1) return STBTT__CSERR("hmoveto stack"); |
| stbtt__csctx_rmove_to(c, s[sp-1], 0); |
| break; |
| |
| case 0x05: // rlineto |
| if (sp < 2) return STBTT__CSERR("rlineto stack"); |
| for (; i + 1 < sp; i += 2) |
| stbtt__csctx_rline_to(c, s[i], s[i+1]); |
| break; |
| |
| // hlineto/vlineto and vhcurveto/hvcurveto alternate horizontal and vertical |
| // starting from a different place. |
| |
| case 0x07: // vlineto |
| if (sp < 1) return STBTT__CSERR("vlineto stack"); |
| goto vlineto; |
| case 0x06: // hlineto |
| if (sp < 1) return STBTT__CSERR("hlineto stack"); |
| for (;;) { |
| if (i >= sp) break; |
| stbtt__csctx_rline_to(c, s[i], 0); |
| i++; |
| vlineto: |
| if (i >= sp) break; |
| stbtt__csctx_rline_to(c, 0, s[i]); |
| i++; |
| } |
| break; |
| |
| case 0x1F: // hvcurveto |
| if (sp < 4) return STBTT__CSERR("hvcurveto stack"); |
| goto hvcurveto; |
| case 0x1E: // vhcurveto |
| if (sp < 4) return STBTT__CSERR("vhcurveto stack"); |
| for (;;) { |
| if (i + 3 >= sp) break; |
| stbtt__csctx_rccurve_to(c, 0, s[i], s[i+1], s[i+2], s[i+3], (sp - i == 5) ? s[i + 4] : 0.0f); |
| i += 4; |
| hvcurveto: |
| if (i + 3 >= sp) break; |
| stbtt__csctx_rccurve_to(c, s[i], 0, s[i+1], s[i+2], (sp - i == 5) ? s[i+4] : 0.0f, s[i+3]); |
| i += 4; |
| } |
| break; |
| |
| case 0x08: // rrcurveto |
| if (sp < 6) return STBTT__CSERR("rcurveline stack"); |
| for (; i + 5 < sp; i += 6) |
| stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]); |
| break; |
| |
| case 0x18: // rcurveline |
| if (sp < 8) return STBTT__CSERR("rcurveline stack"); |
| for (; i + 5 < sp - 2; i += 6) |
| stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]); |
| if (i + 1 >= sp) return STBTT__CSERR("rcurveline stack"); |
| stbtt__csctx_rline_to(c, s[i], s[i+1]); |
| break; |
| |
| case 0x19: // rlinecurve |
| if (sp < 8) return STBTT__CSERR("rlinecurve stack"); |
| for (; i + 1 < sp - 6; i += 2) |
| stbtt__csctx_rline_to(c, s[i], s[i+1]); |
| if (i + 5 >= sp) return STBTT__CSERR("rlinecurve stack"); |
| stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]); |
| break; |
| |
| case 0x1A: // vvcurveto |
| case 0x1B: // hhcurveto |
| if (sp < 4) return STBTT__CSERR("(vv|hh)curveto stack"); |
| f = 0.0; |
| if (sp & 1) { f = s[i]; i++; } |
| for (; i + 3 < sp; i += 4) { |
| if (b0 == 0x1B) |
| stbtt__csctx_rccurve_to(c, s[i], f, s[i+1], s[i+2], s[i+3], 0.0); |
| else |
| stbtt__csctx_rccurve_to(c, f, s[i], s[i+1], s[i+2], 0.0, s[i+3]); |
| f = 0.0; |
| } |
| break; |
| |
| case 0x0A: // callsubr |
| if (!has_subrs) { |
| if (info->fdselect.size) |
| subrs = stbtt__cid_get_glyph_subrs(info, glyph_index); |
| has_subrs = 1; |
| } |
| // FALLTHROUGH |
| case 0x1D: // callgsubr |
| if (sp < 1) return STBTT__CSERR("call(g|)subr stack"); |
| v = (int) s[--sp]; |
| if (subr_stack_height >= 10) return STBTT__CSERR("recursion limit"); |
| subr_stack[subr_stack_height++] = b; |
| b = stbtt__get_subr(b0 == 0x0A ? subrs : info->gsubrs, v); |
| if (b.size == 0) return STBTT__CSERR("subr not found"); |
| b.cursor = 0; |
| clear_stack = 0; |
| break; |
| |
| case 0x0B: // return |
| if (subr_stack_height <= 0) return STBTT__CSERR("return outside subr"); |
| b = subr_stack[--subr_stack_height]; |
| clear_stack = 0; |
| break; |
| |
| case 0x0E: // endchar |
| stbtt__csctx_close_shape(c); |
| return 1; |
| |
| case 0x0C: { // two-byte escape |
| float dx1, dx2, dx3, dx4, dx5, dx6, dy1, dy2, dy3, dy4, dy5, dy6; |
| float dx, dy; |
| int b1 = stbtt__buf_get8(&b); |
| switch (b1) { |
| // @TODO These "flex" implementations ignore the flex-depth and resolution, |
| // and always draw beziers. |
| case 0x22: // hflex |
| if (sp < 7) return STBTT__CSERR("hflex stack"); |
| dx1 = s[0]; |
| dx2 = s[1]; |
| dy2 = s[2]; |
| dx3 = s[3]; |
| dx4 = s[4]; |
| dx5 = s[5]; |
| dx6 = s[6]; |
| stbtt__csctx_rccurve_to(c, dx1, 0, dx2, dy2, dx3, 0); |
| stbtt__csctx_rccurve_to(c, dx4, 0, dx5, -dy2, dx6, 0); |
| break; |
| |
| case 0x23: // flex |
| if (sp < 13) return STBTT__CSERR("flex stack"); |
| dx1 = s[0]; |
| dy1 = s[1]; |
| dx2 = s[2]; |
| dy2 = s[3]; |
| dx3 = s[4]; |
| dy3 = s[5]; |
| dx4 = s[6]; |
| dy4 = s[7]; |
| dx5 = s[8]; |
| dy5 = s[9]; |
| dx6 = s[10]; |
| dy6 = s[11]; |
| //fd is s[12] |
| stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3); |
| stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6); |
| break; |
| |
| case 0x24: // hflex1 |
| if (sp < 9) return STBTT__CSERR("hflex1 stack"); |
| dx1 = s[0]; |
| dy1 = s[1]; |
| dx2 = s[2]; |
| dy2 = s[3]; |
| dx3 = s[4]; |
| dx4 = s[5]; |
| dx5 = s[6]; |
| dy5 = s[7]; |
| dx6 = s[8]; |
| stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, 0); |
| stbtt__csctx_rccurve_to(c, dx4, 0, dx5, dy5, dx6, -(dy1+dy2+dy5)); |
| break; |
| |
| case 0x25: // flex1 |
| if (sp < 11) return STBTT__CSERR("flex1 stack"); |
| dx1 = s[0]; |
| dy1 = s[1]; |
| dx2 = s[2]; |
| dy2 = s[3]; |
| dx3 = s[4]; |
| dy3 = s[5]; |
| dx4 = s[6]; |
| dy4 = s[7]; |
| dx5 = s[8]; |
| dy5 = s[9]; |
| dx6 = dy6 = s[10]; |
| dx = dx1+dx2+dx3+dx4+dx5; |
| dy = dy1+dy2+dy3+dy4+dy5; |
| if (STBTT_fabs(dx) > STBTT_fabs(dy)) |
| dy6 = -dy; |
| else |
| dx6 = -dx; |
| stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3); |
| stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6); |
| break; |
| |
| default: |
| return STBTT__CSERR("unimplemented"); |
| } |
| } break; |
| |
| default: |
| if (b0 != 255 && b0 != 28 && b0 < 32) |
| return STBTT__CSERR("reserved operator"); |
| |
| // push immediate |
| if (b0 == 255) { |
| f = (float)(stbtt_int32)stbtt__buf_get32(&b) / 0x10000; |
| } else { |
| stbtt__buf_skip(&b, -1); |
| f = (float)(stbtt_int16)stbtt__cff_int(&b); |
| } |
| if (sp >= 48) return STBTT__CSERR("push stack overflow"); |
| s[sp++] = f; |
| clear_stack = 0; |
| break; |
| } |
| if (clear_stack) sp = 0; |
| } |
| return STBTT__CSERR("no endchar"); |
| |
| #undef STBTT__CSERR |
| } |
| |
| static int stbtt__GetGlyphShapeT2(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) |
| { |
| // runs the charstring twice, once to count and once to output (to avoid realloc) |
| stbtt__csctx count_ctx = STBTT__CSCTX_INIT(1); |
| stbtt__csctx output_ctx = STBTT__CSCTX_INIT(0); |
| if (stbtt__run_charstring(info, glyph_index, &count_ctx)) { |
| *pvertices = (stbtt_vertex*)STBTT_malloc(count_ctx.num_vertices*sizeof(stbtt_vertex), info->userdata); |
| output_ctx.pvertices = *pvertices; |
| if (stbtt__run_charstring(info, glyph_index, &output_ctx)) { |
| STBTT_assert(output_ctx.num_vertices == count_ctx.num_vertices); |
| return output_ctx.num_vertices; |
| } |
| } |
| *pvertices = NULL; |
| return 0; |
| } |
| |
| static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1) |
| { |
| stbtt__csctx c = STBTT__CSCTX_INIT(1); |
| int r = stbtt__run_charstring(info, glyph_index, &c); |
| if (x0) *x0 = r ? c.min_x : 0; |
| if (y0) *y0 = r ? c.min_y : 0; |
| if (x1) *x1 = r ? c.max_x : 0; |
| if (y1) *y1 = r ? c.max_y : 0; |
| return r ? c.num_vertices : 0; |
| } |
| |
| STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) |
| { |
| if (!info->cff.size) |
| return stbtt__GetGlyphShapeTT(info, glyph_index, pvertices); |
| else |
| return stbtt__GetGlyphShapeT2(info, glyph_index, pvertices); |
| } |
| |
| STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing) |
| { |
| stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34); |
| if (glyph_index < numOfLongHorMetrics) { |
| if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*glyph_index); |
| if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2); |
| } else { |
| if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1)); |
| if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics)); |
| } |
| } |
| |
| STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info) |
| { |
| stbtt_uint8 *data = info->data + info->kern; |
| |
| // 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; |
| |
| return ttUSHORT(data+10); |
| } |
| |
| STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length) |
| { |
| stbtt_uint8 *data = info->data + info->kern; |
| int k, length; |
| |
| // 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; |
| |
| length = ttUSHORT(data+10); |
| if (table_length < length) |
| length = table_length; |
| |
| for (k = 0; k < length; k++) |
| { |
| table[k].glyph1 = ttUSHORT(data+18+(k*6)); |
| table[k].glyph2 = ttUSHORT(data+20+(k*6)); |
| table[k].advance = ttSHORT(data+22+(k*6)); |
| } |
| |
| return length; |
| } |
| |
| static int stbtt__GetGlyphKernInfoAdvance(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; |
| } |
| |
| static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyph) |
| { |
| stbtt_uint16 coverageFormat = ttUSHORT(coverageTable); |
| switch (coverageFormat) { |
| case 1: { |
| stbtt_uint16 glyphCount = ttUSHORT(coverageTable + 2); |
| |
| // Binary search. |
| stbtt_int32 l=0, r=glyphCount-1, m; |
| int straw, needle=glyph; |
| while (l <= r) { |
| stbtt_uint8 *glyphArray = coverageTable + 4; |
| stbtt_uint16 glyphID; |
| m = (l + r) >> 1; |
| glyphID = ttUSHORT(glyphArray + 2 * m); |
| straw = glyphID; |
| if (needle < straw) |
| r = m - 1; |
| else if (needle > straw) |
| l = m + 1; |
| else { |
| return m; |
| } |
| } |
| break; |
| } |
| |
| case 2: { |
| stbtt_uint16 rangeCount = ttUSHORT(coverageTable + 2); |
| stbtt_uint8 *rangeArray = coverageTable + 4; |
| |
| // Binary search. |
| stbtt_int32 l=0, r=rangeCount-1, m; |
| int strawStart, strawEnd, needle=glyph; |
| while (l <= r) { |
| stbtt_uint8 *rangeRecord; |
| m = (l + r) >> 1; |
| rangeRecord = rangeArray + 6 * m; |
| strawStart = ttUSHORT(rangeRecord); |
| strawEnd = ttUSHORT(rangeRecord + 2); |
| if (needle < strawStart) |
| r = m - 1; |
| else if (needle > strawEnd) |
| l = m + 1; |
| else { |
| stbtt_uint16 startCoverageIndex = ttUSHORT(rangeRecord + 4); |
| return startCoverageIndex + glyph - strawStart; |
| } |
| } |
| break; |
| } |
| |
| default: return -1; // unsupported |
| } |
| |
| return -1; |
| } |
| |
| static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph) |
| { |
| stbtt_uint16 classDefFormat = ttUSHORT(classDefTable); |
| switch (classDefFormat) |
| { |
| case 1: { |
| stbtt_uint16 startGlyphID = ttUSHORT(classDefTable + 2); |
| stbtt_uint16 glyphCount = ttUSHORT(classDefTable + 4); |
| stbtt_uint8 *classDef1ValueArray = classDefTable + 6; |
| |
| if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount) |
| return (stbtt_int32)ttUSHORT(classDef1ValueArray + 2 * (glyph - startGlyphID)); |
| break; |
| } |
| |
| case 2: { |
| stbtt_uint16 classRangeCount = ttUSHORT(classDefTable + 2); |
| stbtt_uint8 *classRangeRecords = classDefTable + 4; |
| |
| // Binary search. |
| stbtt_int32 l=0, r=classRangeCount-1, m; |
| int strawStart, strawEnd, needle=glyph; |
| while (l <= r) { |
| stbtt_uint8 *classRangeRecord; |
| m = (l + r) >> 1; |
| classRangeRecord = classRangeRecords + 6 * m; |
| strawStart = ttUSHORT(classRangeRecord); |
| strawEnd = ttUSHORT(classRangeRecord + 2); |
| if (needle < strawStart) |
| r = m - 1; |
| else if (needle > strawEnd) |
| l = m + 1; |
| else |
| return (stbtt_int32)ttUSHORT(classRangeRecord + 4); |
| } |
| break; |
| } |
| |
| default: |
| return -1; // Unsupported definition type, return an error. |
| } |
| |
| // "All glyphs not assigned to a class fall into class 0". (OpenType spec) |
| return 0; |
| } |
| |
| // Define to STBTT_assert(x) if you want to break on unimplemented formats. |
| #define STBTT_GPOS_TODO_assert(x) |
| |
| static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2) |
| { |
| stbtt_uint16 lookupListOffset; |
| stbtt_uint8 *lookupList; |
| stbtt_uint16 lookupCount; |
| stbtt_uint8 *data; |
| stbtt_int32 i, sti; |
| |
| if (!info->gpos) return 0; |
| |
| data = info->data + info->gpos; |
| |
| if (ttUSHORT(data+0) != 1) return 0; // Major version 1 |
| if (ttUSHORT(data+2) != 0) return 0; // Minor version 0 |
| |
| lookupListOffset = ttUSHORT(data+8); |
| lookupList = data + lookupListOffset; |
| lookupCount = ttUSHORT(lookupList); |
| |
| for (i=0; i<lookupCount; ++i) { |
| stbtt_uint16 lookupOffset = ttUSHORT(lookupList + 2 + 2 * i); |
| stbtt_uint8 *lookupTable = lookupList + lookupOffset; |
| |
| stbtt_uint16 lookupType = ttUSHORT(lookupTable); |
| stbtt_uint16 subTableCount = ttUSHORT(lookupTable + 4); |
| stbtt_uint8 *subTableOffsets = lookupTable + 6; |
| if (lookupType != 2) // Pair Adjustment Positioning Subtable |
| continue; |
| |
| for (sti=0; sti<subTableCount; sti++) { |
| stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2 * sti); |
| stbtt_uint8 *table = lookupTable + subtableOffset; |
| stbtt_uint16 posFormat = ttUSHORT(table); |
| stbtt_uint16 coverageOffset = ttUSHORT(table + 2); |
| stbtt_int32 coverageIndex = stbtt__GetCoverageIndex(table + coverageOffset, glyph1); |
| if (coverageIndex == -1) continue; |
| |
| switch (posFormat) { |
| case 1: { |
| stbtt_int32 l, r, m; |
| int straw, needle; |
| stbtt_uint16 valueFormat1 = ttUSHORT(table + 4); |
| stbtt_uint16 valueFormat2 = ttUSHORT(table + 6); |
| if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats? |
| stbtt_int32 valueRecordPairSizeInBytes = 2; |
| stbtt_uint16 pairSetCount = ttUSHORT(table + 8); |
| stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex); |
| stbtt_uint8 *pairValueTable = table + pairPosOffset; |
| stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable); |
| stbtt_uint8 *pairValueArray = pairValueTable + 2; |
| |
| if (coverageIndex >= pairSetCount) return 0; |
| |
| needle=glyph2; |
| r=pairValueCount-1; |
| l=0; |
| |
| // Binary search. |
| while (l <= r) { |
| stbtt_uint16 secondGlyph; |
| stbtt_uint8 *pairValue; |
| m = (l + r) >> 1; |
| pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m; |
| secondGlyph = ttUSHORT(pairValue); |
| straw = secondGlyph; |
| if (needle < straw) |
| r = m - 1; |
| else if (needle > straw) |
| l = m + 1; |
| else { |
| stbtt_int16 xAdvance = ttSHORT(pairValue + 2); |
| return xAdvance; |
| } |
| } |
| } else |
| return 0; |
| break; |
| } |
| |
| case 2: { |
| stbtt_uint16 valueFormat1 = ttUSHORT(table + 4); |
| stbtt_uint16 valueFormat2 = ttUSHORT(table + 6); |
| if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats? |
| stbtt_uint16 classDef1Offset = ttUSHORT(table + 8); |
| stbtt_uint16 classDef2Offset = ttUSHORT(table + 10); |
| int glyph1class = stbtt__GetGlyphClass(table + classDef1Offset, glyph1); |
| int glyph2class = stbtt__GetGlyphClass(table + classDef2Offset, glyph2); |
| |
| stbtt_uint16 class1Count = ttUSHORT(table + 12); |
| stbtt_uint16 class2Count = ttUSHORT(table + 14); |
| stbtt_uint8 *class1Records, *class2Records; |
| stbtt_int16 xAdvance; |
| |
| if (glyph1class < 0 || glyph1class >= class1Count) return 0; // malformed |
| if (glyph2class < 0 || glyph2class >= class2Count) return 0; // malformed |
| |
| class1Records = table + 16; |
| class2Records = class1Records + 2 * (glyph1class * class2Count); |
| xAdvance = ttSHORT(class2Records + 2 * glyph2class); |
| return xAdvance; |
| } else |
| return 0; |
| break; |
| } |
| |
| default: |
| return 0; // Unsupported position format |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1, int g2) |
| { |
| int xAdvance = 0; |
| |
| if (info->gpos) |
| xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, g1, g2); |
| else if (info->kern) |
| xAdvance += stbtt__GetGlyphKernInfoAdvance(info, g1, g2); |
| |
| return xAdvance; |
| } |
| |
| STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2) |
| { |
| if (!info->kern && !info->gpos) // if no kerning table, don't waste time looking up both codepoint->glyphs |
| return 0; |
| return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2)); |
| } |
| |
| STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing) |
| { |
| stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing); |
| } |
| |
| STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap) |
| { |
| if (ascent ) *ascent = ttSHORT(info->data+info->hhea + 4); |
| if (descent) *descent = ttSHORT(info->data+info->hhea + 6); |
| if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8); |
| } |
| |
| STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap) |
| { |
| int tab = stbtt__find_table(info->data, info->fontstart, "OS/2"); |
| if (!tab) |
| return 0; |
| if (typoAscent ) *typoAscent = ttSHORT(info->data+tab + 68); |
| if (typoDescent) *typoDescent = ttSHORT(info->data+tab + 70); |
| if (typoLineGap) *typoLineGap = ttSHORT(info->data+tab + 72); |
| return 1; |
| } |
| |
| STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1) |
| { |
| *x0 = ttSHORT(info->data + info->head + 36); |
| *y0 = ttSHORT(info->data + info->head + 38); |
| *x1 = ttSHORT(info->data + info->head + 40); |
| *y1 = ttSHORT(info->data + info->head + 42); |
| } |
| |
| STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height) |
| { |
| int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6); |
| return (float) height / fheight; |
| } |
| |
| STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels) |
| { |
| int unitsPerEm = ttUSHORT(info->data + info->head + 18); |
| return pixels / unitsPerEm; |
| } |
| |
| STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v) |
| { |
| STBTT_free(v, info->userdata); |
| } |
| |
| STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl) |
| { |
| int i; |
| stbtt_uint8 *data = info->data; |
| stbtt_uint8 *svg_doc_list = data + stbtt__get_svg((stbtt_fontinfo *) info); |
| |
| int numEntries = ttUSHORT(svg_doc_list); |
| stbtt_uint8 *svg_docs = svg_doc_list + 2; |
| |
| for(i=0; i<numEntries; i++) { |
| stbtt_uint8 *svg_doc = svg_docs + (12 * i); |
| if ((gl >= ttUSHORT(svg_doc)) && (gl <= ttUSHORT(svg_doc + 2))) |
| return svg_doc; |
| } |
| return 0; |
| } |
| |
| STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg) |
| { |
| stbtt_uint8 *data = info->data; |
| stbtt_uint8 *svg_doc; |
|