1 // stb_truetype.h - v1.10 - public domain
2 // authored from 2009-2015 by Sean Barrett / RAD Game Tools
3 //
4 // This library processes TrueType files:
5 // parse files
6 // extract glyph metrics
7 // extract glyph shapes
8 // render glyphs to one-channel bitmaps with antialiasing (box filter)
9 //
10 // Todo:
11 // non-MS cmaps
12 // crashproof on bad data
13 // hinting? (no longer patented)
14 // cleartype-style AA?
15 // optimize: use simple memory allocator for intermediates
16 // optimize: build edge-list directly from curves
17 // optimize: rasterize directly from curves?
18 //
19 // ADDITIONAL CONTRIBUTORS
20 //
21 // Mikko Mononen: compound shape support, more cmap formats
22 // Tor Andersson: kerning, subpixel rendering
23 //
24 // Misc other:
25 // Ryan Gordon
26 // Simon Glass
27 //
28 // Bug/warning reports/fixes:
29 // "Zer" on mollyrocket (with fix)
30 // Cass Everitt
31 // stoiko (Haemimont Games)
32 // Brian Hook
33 // Walter van Niftrik
34 // David Gow
35 // David Given
36 // Ivan-Assen Ivanov
37 // Anthony Pesch
38 // Johan Duparc
39 // Hou Qiming
40 // Fabian "ryg" Giesen
41 // Martins Mozeiko
42 // Cap Petschulat
43 // Omar Cornut
44 // github:aloucks
45 // Peter LaValle
46 // Sergey Popov
47 // Giumo X. Clanjor
48 // Higor Euripedes
49 // Thomas Fields
50 // Derek Vinyard
51 //
52 // VERSION HISTORY
53 //
54 // 1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef
55 // 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly
56 // 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
57 // 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
58 // variant PackFontRanges to pack and render in separate phases;
59 // fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
60 // fixed an assert() bug in the new rasterizer
61 // replace assert() with STBTT_assert() in new rasterizer
62 // 1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine)
63 // also more precise AA rasterizer, except if shapes overlap
64 // remove need for STBTT_sort
65 // 1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC
66 // 1.04 (2015-04-15) typo in example
67 // 1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes
68 //
69 // Full history can be found at the end of this file.
70 //
71 // LICENSE
72 //
73 // This software is dual-licensed to the public domain and under the following
74 // license: you are granted a perpetual, irrevocable license to copy, modify,
75 // publish, and distribute this file as you see fit.
76 //
77 // USAGE
78 //
79 // Include this file in whatever places neeed to refer to it. In ONE C/C++
80 // file, write:
81 // #define STB_TRUETYPE_IMPLEMENTATION
82 // before the #include of this file. This expands out the actual
83 // implementation into that C/C++ file.
84 //
85 // To make the implementation private to the file that generates the implementation,
86 // #define STBTT_STATIC
87 //
88 // Simple 3D API (don't ship this, but it's fine for tools and quick start)
89 // stbtt_BakeFontBitmap() -- bake a font to a bitmap for use as texture
90 // stbtt_GetBakedQuad() -- compute quad to draw for a given char
91 //
92 // Improved 3D API (more shippable):
93 // #include "stb_rect_pack.h" -- optional, but you really want it
94 // stbtt_PackBegin()
95 // stbtt_PackSetOversample() -- for improved quality on small fonts
96 // stbtt_PackFontRanges() -- pack and renders
97 // stbtt_PackEnd()
98 // stbtt_GetPackedQuad()
99 //
100 // "Load" a font file from a memory buffer (you have to keep the buffer loaded)
101 // stbtt_InitFont()
102 // stbtt_GetFontOffsetForIndex() -- use for TTC font collections
103 //
104 // Render a unicode codepoint to a bitmap
105 // stbtt_GetCodepointBitmap() -- allocates and returns a bitmap
106 // stbtt_MakeCodepointBitmap() -- renders into bitmap you provide
107 // stbtt_GetCodepointBitmapBox() -- how big the bitmap must be
108 //
109 // Character advance/positioning
110 // stbtt_GetCodepointHMetrics()
111 // stbtt_GetFontVMetrics()
112 // stbtt_GetCodepointKernAdvance()
113 //
114 // Starting with version 1.06, the rasterizer was replaced with a new,
115 // faster and generally-more-precise rasterizer. The new rasterizer more
116 // accurately measures pixel coverage for anti-aliasing, except in the case
117 // where multiple shapes overlap, in which case it overestimates the AA pixel
118 // coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If
119 // this turns out to be a problem, you can re-enable the old rasterizer with
120 // #define STBTT_RASTERIZER_VERSION 1
121 // which will incur about a 15% speed hit.
122 //
123 // ADDITIONAL DOCUMENTATION
124 //
125 // Immediately after this block comment are a series of sample programs.
126 //
127 // After the sample programs is the "header file" section. This section
128 // includes documentation for each API function.
129 //
130 // Some important concepts to understand to use this library:
131 //
132 // Codepoint
133 // Characters are defined by unicode codepoints, e.g. 65 is
134 // uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is
135 // the hiragana for "ma".
136 //
137 // Glyph
138 // A visual character shape (every codepoint is rendered as
139 // some glyph)
140 //
141 // Glyph index
142 // A font-specific integer ID representing a glyph
143 //
144 // Baseline
145 // Glyph shapes are defined relative to a baseline, which is the
146 // bottom of uppercase characters. Characters extend both above
147 // and below the baseline.
148 //
149 // Current Point
150 // As you draw text to the screen, you keep track of a "current point"
151 // which is the origin of each character. The current point's vertical
152 // position is the baseline. Even "baked fonts" use this model.
153 //
154 // Vertical Font Metrics
155 // The vertical qualities of the font, used to vertically position
156 // and space the characters. See docs for stbtt_GetFontVMetrics.
157 //
158 // Font Size in Pixels or Points
159 // The preferred interface for specifying font sizes in stb_truetype
160 // is to specify how tall the font's vertical extent should be in pixels.
161 // If that sounds good enough, skip the next paragraph.
162 //
163 // Most font APIs instead use "points", which are a common typographic
164 // measurement for describing font size, defined as 72 points per inch.
165 // stb_truetype provides a point API for compatibility. However, true
166 // "per inch" conventions don't make much sense on computer displays
167 // since they different monitors have different number of pixels per
168 // inch. For example, Windows traditionally uses a convention that
169 // there are 96 pixels per inch, thus making 'inch' measurements have
170 // nothing to do with inches, and thus effectively defining a point to
171 // be 1.333 pixels. Additionally, the TrueType font data provides
172 // an explicit scale factor to scale a given font's glyphs to points,
173 // but the author has observed that this scale factor is often wrong
174 // for non-commercial fonts, thus making fonts scaled in points
175 // according to the TrueType spec incoherently sized in practice.
176 //
177 // ADVANCED USAGE
178 //
179 // Quality:
180 //
181 // - Use the functions with Subpixel at the end to allow your characters
182 // to have subpixel positioning. Since the font is anti-aliased, not
183 // hinted, this is very import for quality. (This is not possible with
184 // baked fonts.)
185 //
186 // - Kerning is now supported, and if you're supporting subpixel rendering
187 // then kerning is worth using to give your text a polished look.
188 //
189 // Performance:
190 //
191 // - Convert Unicode codepoints to glyph indexes and operate on the glyphs;
192 // if you don't do this, stb_truetype is forced to do the conversion on
193 // every call.
194 //
195 // - There are a lot of memory allocations. We should modify it to take
196 // a temp buffer and allocate from the temp buffer (without freeing),
197 // should help performance a lot.
198 //
199 // NOTES
200 //
201 // The system uses the raw data found in the .ttf file without changing it
202 // and without building auxiliary data structures. This is a bit inefficient
203 // on little-endian systems (the data is big-endian), but assuming you're
204 // caching the bitmaps or glyph shapes this shouldn't be a big deal.
205 //
206 // It appears to be very hard to programmatically determine what font a
207 // given file is in a general way. I provide an API for this, but I don't
208 // recommend it.
209 //
210 //
211 // SOURCE STATISTICS (based on v0.6c, 2050 LOC)
212 //
213 // Documentation & header file 520 LOC \___ 660 LOC documentation
214 // Sample code 140 LOC /
215 // Truetype parsing 620 LOC ---- 620 LOC TrueType
216 // Software rasterization 240 LOC \ .
217 // Curve tesselation 120 LOC \__ 550 LOC Bitmap creation
218 // Bitmap management 100 LOC /
219 // Baked bitmap interface 70 LOC /
220 // Font name matching & access 150 LOC ---- 150
221 // C runtime library abstraction 60 LOC ---- 60
222 //
223 //
224 // PERFORMANCE MEASUREMENTS FOR 1.06:
225 //
226 // 32-bit 64-bit
227 // Previous release: 8.83 s 7.68 s
228 // Pool allocations: 7.72 s 6.34 s
229 // Inline sort : 6.54 s 5.65 s
230 // New rasterizer : 5.63 s 5.00 s
231
232 //////////////////////////////////////////////////////////////////////////////
233 //////////////////////////////////////////////////////////////////////////////
234 ////
235 //// SAMPLE PROGRAMS
236 ////
237 //
238 // Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless
239 //
240 #if 0
241 #define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation
242 #include "stb_truetype.h"
243
244 unsigned char ttf_buffer[1<<20];
245 unsigned char temp_bitmap[512*512];
246
247 stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
248 GLuint ftex;
249
250 void my_stbtt_initfont(void)
251 {
252 fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
253 stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits!
254 // can free ttf_buffer at this point
255 glGenTextures(1, &ftex);
256 glBindTexture(GL_TEXTURE_2D, ftex);
257 glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
258 // can free temp_bitmap at this point
259 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
260 }
261
262 void my_stbtt_print(float x, float y, char *text)
263 {
264 // assume orthographic projection with units = screen pixels, origin at top left
265 glEnable(GL_TEXTURE_2D);
266 glBindTexture(GL_TEXTURE_2D, ftex);
267 glBegin(GL_QUADS);
268 while (*text) {
269 if (*text >= 32 && *text < 128) {
270 stbtt_aligned_quad q;
271 stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9
272 glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
273 glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
274 glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
275 glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1);
276 }
277 ++text;
278 }
279 glEnd();
280 }
281 #endif
282 //
283 //
284 //////////////////////////////////////////////////////////////////////////////
285 //
286 // Complete program (this compiles): get a single bitmap, print as ASCII art
287 //
288 #if 0
289 #include <stdio.h>
290 #define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation
291 #include "stb_truetype.h"
292
293 char ttf_buffer[1<<25];
294
295 int main(int argc, char **argv)
296 {
297 stbtt_fontinfo font;
298 unsigned char *bitmap;
299 int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);
300
301 fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));
302
303 stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
304 bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);
305
306 for (j=0; j < h; ++j) {
307 for (i=0; i < w; ++i)
308 putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
309 putchar('\n');
310 }
311 return 0;
312 }
313 #endif
314 //
315 // Output:
316 //
317 // .ii.
318 // @@@@@@.
319 // V@Mio@@o
320 // :i. V@V
321 // :oM@@M
322 // :@@@MM@M
323 // @@o o@M
324 // :@@. M@M
325 // @@@o@@@@
326 // :M@@V:@@.
327 //
328 //////////////////////////////////////////////////////////////////////////////
329 //
330 // Complete program: print "Hello World!" banner, with bugs
331 //
332 #if 0
333 char buffer[24<<20];
334 unsigned char screen[20][79];
335
336 int main(int arg, char **argv)
337 {
338 stbtt_fontinfo font;
339 int i,j,ascent,baseline,ch=0;
340 float scale, xpos=2; // leave a little padding in case the character extends left
341 char *text = "Heljo World!"; // intentionally misspelled to show 'lj' brokenness
342
343 fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
344 stbtt_InitFont(&font, buffer, 0);
345
346 scale = stbtt_ScaleForPixelHeight(&font, 15);
347 stbtt_GetFontVMetrics(&font, &ascent,0,0);
348 baseline = (int) (ascent*scale);
349
350 while (text[ch]) {
351 int advance,lsb,x0,y0,x1,y1;
352 float x_shift = xpos - (float) floor(xpos);
353 stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
354 stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
355 stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
356 // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
357 // because this API is really for baking character bitmaps into textures. if you want to render
358 // a sequence of characters, you really need to render each bitmap to a temp buffer, then
359 // "alpha blend" that into the working buffer
360 xpos += (advance * scale);
361 if (text[ch+1])
362 xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
363 ++ch;
364 }
365
366 for (j=0; j < 20; ++j) {
367 for (i=0; i < 78; ++i)
368 putchar(" .:ioVM@"[screen[j][i]>>5]);
369 putchar('\n');
370 }
371
372 return 0;
373 }
374 #endif
375
376
377 //////////////////////////////////////////////////////////////////////////////
378 //////////////////////////////////////////////////////////////////////////////
379 ////
380 //// INTEGRATION WITH YOUR CODEBASE
381 ////
382 //// The following sections allow you to supply alternate definitions
383 //// of C library functions used by stb_truetype.
384
385 #ifdef STB_TRUETYPE_IMPLEMENTATION
386 // #define your own (u)stbtt_int8/16/32 before including to override this
387 #ifndef stbtt_uint8
388 typedef unsigned char stbtt_uint8;
389 typedef signed char stbtt_int8;
390 typedef unsigned short stbtt_uint16;
391 typedef signed short stbtt_int16;
392 typedef unsigned int stbtt_uint32;
393 typedef signed int stbtt_int32;
394 #endif
395
396 typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
397 typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
398
399 // #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
400 #ifndef STBTT_ifloor
401 #include <math.h>
402 #define STBTT_ifloor(x) ((int) floor(x))
403 #define STBTT_iceil(x) ((int) ceil(x))
404 #endif
405
406 #ifndef STBTT_sqrt
407 #include <math.h>
408 #define STBTT_sqrt(x) sqrt(x)
409 #endif
410
411 #ifndef STBTT_fabs
412 #include <math.h>
413 #define STBTT_fabs(x) fabs(x)
414 #endif
415
416 // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
417 #ifndef STBTT_malloc
418 #include <stdlib.h>
419 #define STBTT_malloc(x,u) ((void)(u),malloc(x))
420 #define STBTT_free(x,u) ((void)(u),free(x))
421 #endif
422
423 #ifndef STBTT_assert
424 #include <assert.h>
425 #define STBTT_assert(x) assert(x)
426 #endif
427
428 #ifndef STBTT_strlen
429 #include <string.h>
430 #define STBTT_strlen(x) strlen(x)
431 #endif
432
433 #ifndef STBTT_memcpy
434 #include <memory.h>
435 #define STBTT_memcpy memcpy
436 #define STBTT_memset memset
437 #endif
438 #endif
439
440 ///////////////////////////////////////////////////////////////////////////////
441 ///////////////////////////////////////////////////////////////////////////////
442 ////
443 //// INTERFACE
444 ////
445 ////
446
447 #ifndef __STB_INCLUDE_STB_TRUETYPE_H__
448 #define __STB_INCLUDE_STB_TRUETYPE_H__
449
450 #ifdef STBTT_STATIC
451 #define STBTT_DEF static
452 #else
453 #define STBTT_DEF extern
454 #endif
455
456 #ifdef __cplusplus
457 extern "C" {
458 #endif
459
460 //////////////////////////////////////////////////////////////////////////////
461 //
462 // TEXTURE BAKING API
463 //
464 // If you use this API, you only have to call two functions ever.
465 //
466
467 typedef struct
468 {
469 unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
470 float xoff,yoff,xadvance;
471 } stbtt_bakedchar;
472
473 STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf)
474 float pixel_height, // height of font in pixels
475 unsigned char *pixels, int pw, int ph, // bitmap to be filled in
476 int first_char, int num_chars, // characters to bake
477 stbtt_bakedchar *chardata); // you allocate this, it's num_chars long
478 // if return is positive, the first unused row of the bitmap
479 // if return is negative, returns the negative of the number of characters that fit
480 // if return is 0, no characters fit and no rows were used
481 // This uses a very crappy packing.
482
483 typedef struct
484 {
485 float x0,y0,s0,t0; // top-left
486 float x1,y1,s1,t1; // bottom-right
487 } stbtt_aligned_quad;
488
489 STBTT_DEF void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, // same data as above
490 int char_index, // character to display
491 float *xpos, float *ypos, // pointers to current position in screen pixel space
492 stbtt_aligned_quad *q, // output: quad to draw
493 int opengl_fillrule); // true if opengl fill rule; false if DX9 or earlier
494 // Call GetBakedQuad with char_index = 'character - first_char', and it
495 // creates the quad you need to draw and advances the current position.
496 //
497 // The coordinate system used assumes y increases downwards.
498 //
499 // Characters will extend both above and below the current position;
500 // see discussion of "BASELINE" above.
501 //
502 // It's inefficient; you might want to c&p it and optimize it.
503
504
505
506 //////////////////////////////////////////////////////////////////////////////
507 //
508 // NEW TEXTURE BAKING API
509 //
510 // This provides options for packing multiple fonts into one atlas, not
511 // perfectly but better than nothing.
512
513 typedef struct
514 {
515 unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
516 float xoff,yoff,xadvance;
517 float xoff2,yoff2;
518 } stbtt_packedchar;
519
520 typedef struct stbtt_pack_context stbtt_pack_context;
521 typedef struct stbtt_fontinfo stbtt_fontinfo;
522 #ifndef STB_RECT_PACK_VERSION
523 typedef struct stbrp_rect stbrp_rect;
524 #endif
525
526 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);
527 // Initializes a packing context stored in the passed-in stbtt_pack_context.
528 // Future calls using this context will pack characters into the bitmap passed
529 // in here: a 1-channel bitmap that is weight x height. stride_in_bytes is
530 // the distance from one row to the next (or 0 to mean they are packed tightly
531 // together). "padding" is the amount of padding to leave between each
532 // character (normally you want '1' for bitmaps you'll use as textures with
533 // bilinear filtering).
534 //
535 // Returns 0 on failure, 1 on success.
536
537 STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc);
538 // Cleans up the packing context and frees all memory.
539
540 #define STBTT_POINT_SIZE(x) (-(x))
541
542 STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, float font_size,
543 int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range);
544 // Creates character bitmaps from the font_index'th font found in fontdata (use
545 // font_index=0 if you don't know what that is). It creates num_chars_in_range
546 // bitmaps for characters with unicode values starting at first_unicode_char_in_range
547 // and increasing. Data for how to render them is stored in chardata_for_range;
548 // pass these to stbtt_GetPackedQuad to get back renderable quads.
549 //
550 // font_size is the full height of the character from ascender to descender,
551 // as computed by stbtt_ScaleForPixelHeight. To use a point size as computed
552 // by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE()
553 // and pass that result as 'font_size':
554 // ..., 20 , ... // font max minus min y is 20 pixels tall
555 // ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall
556
557 typedef struct
558 {
559 float font_size;
560 int first_unicode_codepoint_in_range; // if non-zero, then the chars are continuous, and this is the first codepoint
561 int *array_of_unicode_codepoints; // if non-zero, then this is an array of unicode codepoints
562 int num_chars;
563 stbtt_packedchar *chardata_for_range; // output
564 unsigned char h_oversample, v_oversample; // don't set these, they're used internally
565 } stbtt_pack_range;
566
567 STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges);
568 // Creates character bitmaps from multiple ranges of characters stored in
569 // ranges. This will usually create a better-packed bitmap than multiple
570 // calls to stbtt_PackFontRange. Note that you can call this multiple
571 // times within a single PackBegin/PackEnd.
572
573 STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample);
574 // Oversampling a font increases the quality by allowing higher-quality subpixel
575 // positioning, and is especially valuable at smaller text sizes.
576 //
577 // This function sets the amount of oversampling for all following calls to
578 // stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given
579 // pack context. The default (no oversampling) is achieved by h_oversample=1
580 // and v_oversample=1. The total number of pixels required is
581 // h_oversample*v_oversample larger than the default; for example, 2x2
582 // oversampling requires 4x the storage of 1x1. For best results, render
583 // oversampled textures with bilinear filtering. Look at the readme in
584 // stb/tests/oversample for information about oversampled fonts
585 //
586 // To use with PackFontRangesGather etc., you must set it before calls
587 // call to PackFontRangesGatherRects.
588
589 STBTT_DEF void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph, // same data as above
590 int char_index, // character to display
591 float *xpos, float *ypos, // pointers to current position in screen pixel space
592 stbtt_aligned_quad *q, // output: quad to draw
593 int align_to_integer);
594
595 STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
596 STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects);
597 STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
598 // Calling these functions in sequence is roughly equivalent to calling
599 // stbtt_PackFontRanges(). If you more control over the packing of multiple
600 // fonts, or if you want to pack custom data into a font texture, take a look
601 // at the source to of stbtt_PackFontRanges() and create a custom version
602 // using these functions, e.g. call GatherRects multiple times,
603 // building up a single array of rects, then call PackRects once,
604 // then call RenderIntoRects repeatedly. This may result in a
605 // better packing than calling PackFontRanges multiple times
606 // (or it may not).
607
608 // this is an opaque structure that you shouldn't mess with which holds
609 // all the context needed from PackBegin to PackEnd.
610 struct stbtt_pack_context {
611 void *user_allocator_context;
612 void *pack_info;
613 int width;
614 int height;
615 int stride_in_bytes;
616 int padding;
617 unsigned int h_oversample, v_oversample;
618 unsigned char *pixels;
619 void *nodes;
620 };
621
622 //////////////////////////////////////////////////////////////////////////////
623 //
624 // FONT LOADING
625 //
626 //
627
628 STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
629 // Each .ttf/.ttc file may have more than one font. Each font has a sequential
630 // index number starting from 0. Call this function to get the font offset for
631 // a given index; it returns -1 if the index is out of range. A regular .ttf
632 // file will only define one font and it always be at offset 0, so it will
633 // return '0' for index 0, and -1 for all other indices. You can just skip
634 // this step if you know it's that kind of font.
635
636
637 // The following structure is defined publically so you can declare one on
638 // the stack or as a global or etc, but you should treat it as opaque.
639 struct stbtt_fontinfo
640 {
641 void * userdata;
642 unsigned char * data; // pointer to .ttf file
643 int fontstart; // offset of start of font
644
645 int numGlyphs; // number of glyphs, needed for range checking
646
647 int loca,head,glyf,hhea,hmtx,kern; // table locations as offset from start of .ttf
648 int index_map; // a cmap mapping for our chosen character encoding
649 int indexToLocFormat; // format needed to map from glyph index to glyph
650 };
651
652 STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
653 // Given an offset into the file that defines a font, this function builds
654 // the necessary cached info for the rest of the system. You must allocate
655 // the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't
656 // need to do anything special to free it, because the contents are pure
657 // value data with no additional data structures. Returns 0 on failure.
658
659
660 //////////////////////////////////////////////////////////////////////////////
661 //
662 // CHARACTER TO GLYPH-INDEX CONVERSIOn
663
664 STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
665 // If you're going to perform multiple operations on the same character
666 // and you want a speed-up, call this function with the character you're
667 // going to process, then use glyph-based functions instead of the
668 // codepoint-based functions.
669
670
671 //////////////////////////////////////////////////////////////////////////////
672 //
673 // CHARACTER PROPERTIES
674 //
675
676 STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels);
677 // computes a scale factor to produce a font whose "height" is 'pixels' tall.
678 // Height is measured as the distance from the highest ascender to the lowest
679 // descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics
680 // and computing:
681 // scale = pixels / (ascent - descent)
682 // so if you prefer to measure height by the ascent only, use a similar calculation.
683
684 STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels);
685 // computes a scale factor to produce a font whose EM size is mapped to
686 // 'pixels' tall. This is probably what traditional APIs compute, but
687 // I'm not positive.
688
689 STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap);
690 // ascent is the coordinate above the baseline the font extends; descent
691 // is the coordinate below the baseline the font extends (i.e. it is typically negative)
692 // lineGap is the spacing between one row's descent and the next row's ascent...
693 // so you should advance the vertical position by "*ascent - *descent + *lineGap"
694 // these are expressed in unscaled coordinates, so you must multiply by
695 // the scale factor for a given size
696
697 STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
698 // the bounding box around all possible characters
699
700 STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing);
701 // leftSideBearing is the offset from the current horizontal position to the left edge of the character
702 // advanceWidth is the offset from the current horizontal position to the next horizontal position
703 // these are expressed in unscaled coordinates
704
705 STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
706 // an additional amount to add to the 'advance' value between ch1 and ch2
707
708 STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
709 // Gets the bounding box of the visible part of the glyph, in unscaled coordinates
710
711 STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
712 STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
713 STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
714 // as above, but takes one or more glyph indices for greater efficiency
715
716
717 //////////////////////////////////////////////////////////////////////////////
718 //
719 // GLYPH SHAPES (you probably don't need these, but they have to go before
720 // the bitmaps for C declaration-order reasons)
721 //
722
723 #ifndef STBTT_vmove // you can predefine these to use different values (but why?)
724 enum {
725 STBTT_vmove=1,
726 STBTT_vline,
727 STBTT_vcurve
728 };
729 #endif
730
731 #ifndef stbtt_vertex // you can predefine this to use different values
732 // (we share this with other code at RAD)
733 #define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file
734 typedef struct
735 {
736 stbtt_vertex_type x,y,cx,cy;
737 unsigned char type,padding;
738 } stbtt_vertex;
739 #endif
740
741 STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
742 // returns non-zero if nothing is drawn for this glyph
743
744 STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
745 STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
746 // returns # of vertices and fills *vertices with the pointer to them
747 // these are expressed in "unscaled" coordinates
748 //
749 // The shape is a series of countours. Each one starts with
750 // a STBTT_moveto, then consists of a series of mixed
751 // STBTT_lineto and STBTT_curveto segments. A lineto
752 // draws a line from previous endpoint to its x,y; a curveto
753 // draws a quadratic bezier from previous endpoint to
754 // its x,y, using cx,cy as the bezier control point.
755
756 STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
757 // frees the data allocated above
758
759 //////////////////////////////////////////////////////////////////////////////
760 //
761 // BITMAP RENDERING
762 //
763
764 STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
765 // frees the bitmap allocated below
766
767 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);
768 // allocates a large-enough single-channel 8bpp bitmap and renders the
769 // specified character/glyph at the specified scale into it, with
770 // antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
771 // *width & *height are filled out with the width & height of the bitmap,
772 // which is stored left-to-right, top-to-bottom.
773 //
774 // xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap
775
776 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);
777 // the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
778 // shift for the character
779
780 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);
781 // the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap
782 // in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap
783 // is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the
784 // width and height and positioning info for it first.
785
786 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);
787 // same as stbtt_MakeCodepointBitmap, but you can specify a subpixel
788 // shift for the character
789
790 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);
791 // get the bbox of the bitmap centered around the glyph origin; so the
792 // bitmap width is ix1-ix0, height is iy1-iy0, and location to place
793 // the bitmap top left is (leftSideBearing*scale,iy0).
794 // (Note that the bitmap uses y-increases-down, but the shape uses
795 // y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)
796
797 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);
798 // same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel
799 // shift for the character
800
801 // the following functions are equivalent to the above functions, but operate
802 // on glyph indices instead of Unicode codepoints (for efficiency)
803 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);
804 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);
805 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);
806 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);
807 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);
808 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);
809
810
811 // @TODO: don't expose this structure
812 typedef struct
813 {
814 int w,h,stride;
815 unsigned char *pixels;
816 } stbtt__bitmap;
817
818 // rasterize a shape with quadratic beziers into a bitmap
819 STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, // 1-channel bitmap to draw into
820 float flatness_in_pixels, // allowable error of curve in pixels
821 stbtt_vertex *vertices, // array of vertices defining shape
822 int num_verts, // number of vertices in above array
823 float scale_x, float scale_y, // scale applied to input vertices
824 float shift_x, float shift_y, // translation applied to input vertices
825 int x_off, int y_off, // another translation applied to input
826 int invert, // if non-zero, vertically flip shape
827 void *userdata); // context for to STBTT_MALLOC
828
829 //////////////////////////////////////////////////////////////////////////////
830 //
831 // Finding the right font...
832 //
833 // You should really just solve this offline, keep your own tables
834 // of what font is what, and don't try to get it out of the .ttf file.
835 // That's because getting it out of the .ttf file is really hard, because
836 // the names in the file can appear in many possible encodings, in many
837 // possible languages, and e.g. if you need a case-insensitive comparison,
838 // the details of that depend on the encoding & language in a complex way
839 // (actually underspecified in truetype, but also gigantic).
840 //
841 // But you can use the provided functions in two possible ways:
842 // stbtt_FindMatchingFont() will use *case-sensitive* comparisons on
843 // unicode-encoded names to try to find the font you want;
844 // you can run this before calling stbtt_InitFont()
845 //
846 // stbtt_GetFontNameString() lets you get any of the various strings
847 // from the file yourself and do your own comparisons on them.
848 // You have to have called stbtt_InitFont() first.
849
850
851 STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags);
852 // returns the offset (not index) of the font that matches, or -1 if none
853 // if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold".
854 // if you use any other flag, use a font name like "Arial"; this checks
855 // the 'macStyle' header field; i don't know if fonts set this consistently
856 #define STBTT_MACSTYLE_DONTCARE 0
857 #define STBTT_MACSTYLE_BOLD 1
858 #define STBTT_MACSTYLE_ITALIC 2
859 #define STBTT_MACSTYLE_UNDERSCORE 4
860 #define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us check the bitfield is 0
861
862 STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2);
863 // returns 1/0 whether the first string interpreted as utf8 is identical to
864 // the second string interpreted as big-endian utf16... useful for strings from next func
865
866 STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID);
867 // returns the string (which may be big-endian double byte, e.g. for unicode)
868 // and puts the length in bytes in *length.
869 //
870 // some of the values for the IDs are below; for more see the truetype spec:
871 // http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
872 // http://www.microsoft.com/typography/otspec/name.htm
873
874 enum { // platformID
875 STBTT_PLATFORM_ID_UNICODE =0,
876 STBTT_PLATFORM_ID_MAC =1,
877 STBTT_PLATFORM_ID_ISO =2,
878 STBTT_PLATFORM_ID_MICROSOFT =3
879 };
880
881 enum { // encodingID for STBTT_PLATFORM_ID_UNICODE
882 STBTT_UNICODE_EID_UNICODE_1_0 =0,
883 STBTT_UNICODE_EID_UNICODE_1_1 =1,
884 STBTT_UNICODE_EID_ISO_10646 =2,
885 STBTT_UNICODE_EID_UNICODE_2_0_BMP=3,
886 STBTT_UNICODE_EID_UNICODE_2_0_FULL=4
887 };
888
889 enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT
890 STBTT_MS_EID_SYMBOL =0,
891 STBTT_MS_EID_UNICODE_BMP =1,
892 STBTT_MS_EID_SHIFTJIS =2,
893 STBTT_MS_EID_UNICODE_FULL =10
894 };
895
896 enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes
897 STBTT_MAC_EID_ROMAN =0, STBTT_MAC_EID_ARABIC =4,
898 STBTT_MAC_EID_JAPANESE =1, STBTT_MAC_EID_HEBREW =5,
899 STBTT_MAC_EID_CHINESE_TRAD =2, STBTT_MAC_EID_GREEK =6,
900 STBTT_MAC_EID_KOREAN =3, STBTT_MAC_EID_RUSSIAN =7
901 };
902
903 enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID...
904 // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs
905 STBTT_MS_LANG_ENGLISH =0x0409, STBTT_MS_LANG_ITALIAN =0x0410,
906 STBTT_MS_LANG_CHINESE =0x0804, STBTT_MS_LANG_JAPANESE =0x0411,
907 STBTT_MS_LANG_DUTCH =0x0413, STBTT_MS_LANG_KOREAN =0x0412,
908 STBTT_MS_LANG_FRENCH =0x040c, STBTT_MS_LANG_RUSSIAN =0x0419,
909 STBTT_MS_LANG_GERMAN =0x0407, STBTT_MS_LANG_SPANISH =0x0409,
910 STBTT_MS_LANG_HEBREW =0x040d, STBTT_MS_LANG_SWEDISH =0x041D
911 };
912
913 enum { // languageID for STBTT_PLATFORM_ID_MAC
914 STBTT_MAC_LANG_ENGLISH =0 , STBTT_MAC_LANG_JAPANESE =11,
915 STBTT_MAC_LANG_ARABIC =12, STBTT_MAC_LANG_KOREAN =23,
916 STBTT_MAC_LANG_DUTCH =4 , STBTT_MAC_LANG_RUSSIAN =32,
917 STBTT_MAC_LANG_FRENCH =1 , STBTT_MAC_LANG_SPANISH =6 ,
918 STBTT_MAC_LANG_GERMAN =2 , STBTT_MAC_LANG_SWEDISH =5 ,
919 STBTT_MAC_LANG_HEBREW =10, STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33,
920 STBTT_MAC_LANG_ITALIAN =3 , STBTT_MAC_LANG_CHINESE_TRAD =19
921 };
922
923 #ifdef __cplusplus
924 }
925 #endif
926
927 #endif // __STB_INCLUDE_STB_TRUETYPE_H__
928
929 ///////////////////////////////////////////////////////////////////////////////
930 ///////////////////////////////////////////////////////////////////////////////
931 ////
932 //// IMPLEMENTATION
933 ////
934 ////
935
936 #ifdef STB_TRUETYPE_IMPLEMENTATION
937
938 #ifndef STBTT_MAX_OVERSAMPLE
939 #define STBTT_MAX_OVERSAMPLE 8
940 #endif
941
942 #if STBTT_MAX_OVERSAMPLE > 255
943 #error "STBTT_MAX_OVERSAMPLE cannot be > 255"
944 #endif
945
946 typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1];
947
948 #ifndef STBTT_RASTERIZER_VERSION
949 #define STBTT_RASTERIZER_VERSION 2
950 #endif
951
952 //////////////////////////////////////////////////////////////////////////
953 //
954 // accessors to parse data from file
955 //
956
957 // on platforms that don't allow misaligned reads, if we want to allow
958 // truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE
959
960 #define ttBYTE(p) (* (stbtt_uint8 *) (p))
961 #define ttCHAR(p) (* (stbtt_int8 *) (p))
962 #define ttFixed(p) ttLONG(p)
963
964 #if defined(STB_TRUETYPE_BIGENDIAN) && !defined(ALLOW_UNALIGNED_TRUETYPE)
965
966 #define ttUSHORT(p) (* (stbtt_uint16 *) (p))
967 #define ttSHORT(p) (* (stbtt_int16 *) (p))
968 #define ttULONG(p) (* (stbtt_uint32 *) (p))
969 #define ttLONG(p) (* (stbtt_int32 *) (p))
970
971 #else
972
ttUSHORT(const stbtt_uint8 * p)973 static stbtt_uint16 ttUSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
ttSHORT(const stbtt_uint8 * p)974 static stbtt_int16 ttSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
ttULONG(const stbtt_uint8 * p)975 static stbtt_uint32 ttULONG(const stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
ttLONG(const stbtt_uint8 * p)976 static stbtt_int32 ttLONG(const stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
977
978 #endif
979
980 #define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
981 #define stbtt_tag(p,str) stbtt_tag4(p,str[0],str[1],str[2],str[3])
982
stbtt__isfont(const stbtt_uint8 * font)983 static int stbtt__isfont(const stbtt_uint8 *font)
984 {
985 // check the version number
986 if (stbtt_tag4(font, '1',0,0,0)) return 1; // TrueType 1
987 if (stbtt_tag(font, "typ1")) return 1; // TrueType with type 1 font -- we don't support this!
988 if (stbtt_tag(font, "OTTO")) return 1; // OpenType with CFF
989 if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0
990 return 0;
991 }
992
993 // @OPTIMIZE: binary search
stbtt__find_table(stbtt_uint8 * data,stbtt_uint32 fontstart,const char * tag)994 static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag)
995 {
996 stbtt_int32 num_tables = ttUSHORT(data+fontstart+4);
997 stbtt_uint32 tabledir = fontstart + 12;
998 stbtt_int32 i;
999 for (i=0; i < num_tables; ++i) {
1000 stbtt_uint32 loc = tabledir + 16*i;
1001 if (stbtt_tag(data+loc+0, tag))
1002 return ttULONG(data+loc+8);
1003 }
1004 return 0;
1005 }
1006
stbtt_GetFontOffsetForIndex(const unsigned char * font_collection,int index)1007 STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *font_collection, int index)
1008 {
1009 // if it's just a font, there's only one valid index
1010 if (stbtt__isfont(font_collection))
1011 return index == 0 ? 0 : -1;
1012
1013 // check if it's a TTC
1014 if (stbtt_tag(font_collection, "ttcf")) {
1015 // version 1?
1016 if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
1017 stbtt_int32 n = ttLONG(font_collection+8);
1018 if (index >= n)
1019 return -1;
1020 return ttULONG(font_collection+12+index*4);
1021 }
1022 }
1023 return -1;
1024 }
1025
stbtt_InitFont(stbtt_fontinfo * info,const unsigned char * data2,int fontstart)1026 STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data2, int fontstart)
1027 {
1028 stbtt_uint8 *data = (stbtt_uint8 *) data2;
1029 stbtt_uint32 cmap, t;
1030 stbtt_int32 i,numTables;
1031
1032 info->data = data;
1033 info->fontstart = fontstart;
1034
1035 cmap = stbtt__find_table(data, fontstart, "cmap"); // required
1036 info->loca = stbtt__find_table(data, fontstart, "loca"); // required
1037 info->head = stbtt__find_table(data, fontstart, "head"); // required
1038 info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required
1039 info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
1040 info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
1041 info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
1042 if (!cmap || !info->loca || !info->head || !info->glyf || !info->hhea || !info->hmtx)
1043 return 0;
1044
1045 t = stbtt__find_table(data, fontstart, "maxp");
1046 if (t)
1047 info->numGlyphs = ttUSHORT(data+t+4);
1048 else
1049 info->numGlyphs = 0xffff;
1050
1051 // find a cmap encoding table we understand *now* to avoid searching
1052 // later. (todo: could make this installable)
1053 // the same regardless of glyph.
1054 numTables = ttUSHORT(data + cmap + 2);
1055 info->index_map = 0;
1056 for (i=0; i < numTables; ++i) {
1057 stbtt_uint32 encoding_record = cmap + 4 + 8 * i;
1058 // find an encoding we understand:
1059 switch(ttUSHORT(data+encoding_record)) {
1060 case STBTT_PLATFORM_ID_MICROSOFT:
1061 switch (ttUSHORT(data+encoding_record+2)) {
1062 case STBTT_MS_EID_UNICODE_BMP:
1063 case STBTT_MS_EID_UNICODE_FULL:
1064 // MS/Unicode
1065 info->index_map = cmap + ttULONG(data+encoding_record+4);
1066 break;
1067 }
1068 break;
1069 case STBTT_PLATFORM_ID_UNICODE:
1070 // Mac/iOS has these
1071 // all the encodingIDs are unicode, so we don't bother to check it
1072 info->index_map = cmap + ttULONG(data+encoding_record+4);
1073 break;
1074 }
1075 }
1076 if (info->index_map == 0)
1077 return 0;
1078
1079 info->indexToLocFormat = ttUSHORT(data+info->head + 50);
1080 return 1;
1081 }
1082
stbtt_FindGlyphIndex(const stbtt_fontinfo * info,int unicode_codepoint)1083 STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
1084 {
1085 stbtt_uint8 *data = info->data;
1086 stbtt_uint32 index_map = info->index_map;
1087
1088 stbtt_uint16 format = ttUSHORT(data + index_map + 0);
1089 if (format == 0) { // apple byte encoding
1090 stbtt_int32 bytes = ttUSHORT(data + index_map + 2);
1091 if (unicode_codepoint < bytes-6)
1092 return ttBYTE(data + index_map + 6 + unicode_codepoint);
1093 return 0;
1094 } else if (format == 6) {
1095 stbtt_uint32 first = ttUSHORT(data + index_map + 6);
1096 stbtt_uint32 count = ttUSHORT(data + index_map + 8);
1097 if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count)
1098 return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2);
1099 return 0;
1100 } else if (format == 2) {
1101 STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean
1102 return 0;
1103 } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges
1104 stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1;
1105 stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1;
1106 stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10);
1107 stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1;
1108
1109 // do a binary search of the segments
1110 stbtt_uint32 endCount = index_map + 14;
1111 stbtt_uint32 search = endCount;
1112
1113 if (unicode_codepoint > 0xffff)
1114 return 0;
1115
1116 // they lie from endCount .. endCount + segCount
1117 // but searchRange is the nearest power of two, so...
1118 if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2))
1119 search += rangeShift*2;
1120
1121 // now decrement to bias correctly to find smallest
1122 search -= 2;
1123 while (entrySelector) {
1124 stbtt_uint16 end;
1125 searchRange >>= 1;
1126 end = ttUSHORT(data + search + searchRange*2);
1127 if (unicode_codepoint > end)
1128 search += searchRange*2;
1129 --entrySelector;
1130 }
1131 search += 2;
1132
1133 {
1134 stbtt_uint16 offset, start;
1135 stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1);
1136
1137 STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
1138 start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
1139 if (unicode_codepoint < start)
1140 return 0;
1141
1142 offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
1143 if (offset == 0)
1144 return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));
1145
1146 return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
1147 }
1148 } else if (format == 12 || format == 13) {
1149 stbtt_uint32 ngroups = ttULONG(data+index_map+12);
1150 stbtt_int32 low,high;
1151 low = 0; high = (stbtt_int32)ngroups;
1152 // Binary search the right group.
1153 while (low < high) {
1154 stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high
1155 stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12);
1156 stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4);
1157 if ((stbtt_uint32) unicode_codepoint < start_char)
1158 high = mid;
1159 else if ((stbtt_uint32) unicode_codepoint > end_char)
1160 low = mid+1;
1161 else {
1162 stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8);
1163 if (format == 12)
1164 return start_glyph + unicode_codepoint-start_char;
1165 else // format == 13
1166 return start_glyph;
1167 }
1168 }
1169 return 0; // not found
1170 }
1171 // @TODO
1172 STBTT_assert(0);
1173 return 0;
1174 }
1175
stbtt_GetCodepointShape(const stbtt_fontinfo * info,int unicode_codepoint,stbtt_vertex ** vertices)1176 STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices)
1177 {
1178 return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices);
1179 }
1180
stbtt_setvertex(stbtt_vertex * v,stbtt_uint8 type,stbtt_int32 x,stbtt_int32 y,stbtt_int32 cx,stbtt_int32 cy)1181 static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy)
1182 {
1183 v->type = type;
1184 v->x = (stbtt_int16) x;
1185 v->y = (stbtt_int16) y;
1186 v->cx = (stbtt_int16) cx;
1187 v->cy = (stbtt_int16) cy;
1188 }
1189
stbtt__GetGlyfOffset(const stbtt_fontinfo * info,int glyph_index)1190 static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index)
1191 {
1192 int g1,g2;
1193
1194 if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range
1195 if (info->indexToLocFormat >= 2) return -1; // unknown index->glyph map format
1196
1197 if (info->indexToLocFormat == 0) {
1198 g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
1199 g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
1200 } else {
1201 g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4);
1202 g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4);
1203 }
1204
1205 return g1==g2 ? -1 : g1; // if length is 0, return -1
1206 }
1207
stbtt_GetGlyphBox(const stbtt_fontinfo * info,int glyph_index,int * x0,int * y0,int * x1,int * y1)1208 STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
1209 {
1210 int g = stbtt__GetGlyfOffset(info, glyph_index);
1211 if (g < 0) return 0;
1212
1213 if (x0) *x0 = ttSHORT(info->data + g + 2);
1214 if (y0) *y0 = ttSHORT(info->data + g + 4);
1215 if (x1) *x1 = ttSHORT(info->data + g + 6);
1216 if (y1) *y1 = ttSHORT(info->data + g + 8);
1217 return 1;
1218 }
1219
stbtt_GetCodepointBox(const stbtt_fontinfo * info,int codepoint,int * x0,int * y0,int * x1,int * y1)1220 STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1)
1221 {
1222 return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1);
1223 }
1224
stbtt_IsGlyphEmpty(const stbtt_fontinfo * info,int glyph_index)1225 STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
1226 {
1227 stbtt_int16 numberOfContours;
1228 int g = stbtt__GetGlyfOffset(info, glyph_index);
1229 if (g < 0) return 1;
1230 numberOfContours = ttSHORT(info->data + g);
1231 return numberOfContours == 0;
1232 }
1233
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)1234 static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off,
1235 stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy)
1236 {
1237 if (start_off) {
1238 if (was_off)
1239 stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
1240 stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy);
1241 } else {
1242 if (was_off)
1243 stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy);
1244 else
1245 stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0);
1246 }
1247 return num_vertices;
1248 }
1249
stbtt_GetGlyphShape(const stbtt_fontinfo * info,int glyph_index,stbtt_vertex ** pvertices)1250 STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
1251 {
1252 stbtt_int16 numberOfContours;
1253 stbtt_uint8 *endPtsOfContours;
1254 stbtt_uint8 *data = info->data;
1255 stbtt_vertex *vertices=0;
1256 int num_vertices=0;
1257 int g = stbtt__GetGlyfOffset(info, glyph_index);
1258
1259 *pvertices = NULL;
1260
1261 if (g < 0) return 0;
1262
1263 numberOfContours = ttSHORT(data + g);
1264
1265 if (numberOfContours > 0) {
1266 stbtt_uint8 flags=0,flagcount;
1267 stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
1268 stbtt_int32 x,y,cx,cy,sx,sy, scx,scy;
1269 stbtt_uint8 *points;
1270 endPtsOfContours = (data + g + 10);
1271 ins = ttUSHORT(data + g + 10 + numberOfContours * 2);
1272 points = data + g + 10 + numberOfContours * 2 + 2 + ins;
1273
1274 n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);
1275
1276 m = n + 2*numberOfContours; // a loose bound on how many vertices we might need
1277 vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
1278 if (vertices == 0)
1279 return 0;
1280
1281 next_move = 0;
1282 flagcount=0;
1283
1284 // in first pass, we load uninterpreted data into the allocated array
1285 // above, shifted to the end of the array so we won't overwrite it when
1286 // we create our final data starting from the front
1287
1288 off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated
1289
1290 // first load flags
1291
1292 for (i=0; i < n; ++i) {
1293 if (flagcount == 0) {
1294 flags = *points++;
1295 if (flags & 8)
1296 flagcount = *points++;
1297 } else
1298 --flagcount;
1299 vertices[off+i].type = flags;
1300 }
1301
1302 // now load x coordinates
1303 x=0;
1304 for (i=0; i < n; ++i) {
1305 flags = vertices[off+i].type;
1306 if (flags & 2) {
1307 stbtt_int16 dx = *points++;
1308 x += (flags & 16) ? dx : -dx; // ???
1309 } else {
1310 if (!(flags & 16)) {
1311 x = x + (stbtt_int16) (points[0]*256 + points[1]);
1312 points += 2;
1313 }
1314 }
1315 vertices[off+i].x = (stbtt_int16) x;
1316 }
1317
1318 // now load y coordinates
1319 y=0;
1320 for (i=0; i < n; ++i) {
1321 flags = vertices[off+i].type;
1322 if (flags & 4) {
1323 stbtt_int16 dy = *points++;
1324 y += (flags & 32) ? dy : -dy; // ???
1325 } else {
1326 if (!(flags & 32)) {
1327 y = y + (stbtt_int16) (points[0]*256 + points[1]);
1328 points += 2;
1329 }
1330 }
1331 vertices[off+i].y = (stbtt_int16) y;
1332 }
1333
1334 // now convert them to our format
1335 num_vertices=0;
1336 sx = sy = cx = cy = scx = scy = 0;
1337 for (i=0; i < n; ++i) {
1338 flags = vertices[off+i].type;
1339 x = (stbtt_int16) vertices[off+i].x;
1340 y = (stbtt_int16) vertices[off+i].y;
1341
1342 if (next_move == i) {
1343 if (i != 0)
1344 num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
1345
1346 // now start the new one
1347 start_off = !(flags & 1);
1348 if (start_off) {
1349 // if we start off with an off-curve point, then when we need to find a point on the curve
1350 // where we can start, and we need to save some state for when we wraparound.
1351 scx = x;
1352 scy = y;
1353 if (!(vertices[off+i+1].type & 1)) {
1354 // next point is also a curve point, so interpolate an on-point curve
1355 sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1;
1356 sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1;
1357 } else {
1358 // otherwise just use the next point as our start point
1359 sx = (stbtt_int32) vertices[off+i+1].x;
1360 sy = (stbtt_int32) vertices[off+i+1].y;
1361 ++i; // we're using point i+1 as the starting point, so skip it
1362 }
1363 } else {
1364 sx = x;
1365 sy = y;
1366 }
1367 stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0);
1368 was_off = 0;
1369 next_move = 1 + ttUSHORT(endPtsOfContours+j*2);
1370 ++j;
1371 } else {
1372 if (!(flags & 1)) { // if it's a curve
1373 if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint
1374 stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
1375 cx = x;
1376 cy = y;
1377 was_off = 1;
1378 } else {
1379 if (was_off)
1380 stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy);
1381 else
1382 stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0);
1383 was_off = 0;
1384 }
1385 }
1386 }
1387 num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
1388 } else if (numberOfContours == -1) {
1389 // Compound shapes.
1390 int more = 1;
1391 stbtt_uint8 *comp = data + g + 10;
1392 num_vertices = 0;
1393 vertices = 0;
1394 while (more) {
1395 stbtt_uint16 flags, gidx;
1396 int comp_num_verts = 0, i;
1397 stbtt_vertex *comp_verts = 0, *tmp = 0;
1398 float mtx[6] = {1,0,0,1,0,0}, m, n;
1399
1400 flags = ttSHORT(comp); comp+=2;
1401 gidx = ttSHORT(comp); comp+=2;
1402
1403 if (flags & 2) { // XY values
1404 if (flags & 1) { // shorts
1405 mtx[4] = ttSHORT(comp); comp+=2;
1406 mtx[5] = ttSHORT(comp); comp+=2;
1407 } else {
1408 mtx[4] = ttCHAR(comp); comp+=1;
1409 mtx[5] = ttCHAR(comp); comp+=1;
1410 }
1411 }
1412 else {
1413 // @TODO handle matching point
1414 STBTT_assert(0);
1415 }
1416 if (flags & (1<<3)) { // WE_HAVE_A_SCALE
1417 mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
1418 mtx[1] = mtx[2] = 0;
1419 } else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE
1420 mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
1421 mtx[1] = mtx[2] = 0;
1422 mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
1423 } else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO
1424 mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
1425 mtx[1] = ttSHORT(comp)/16384.0f; comp+=2;
1426 mtx[2] = ttSHORT(comp)/16384.0f; comp+=2;
1427 mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
1428 }
1429
1430 // Find transformation scales.
1431 m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
1432 n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);
1433
1434 // Get indexed glyph.
1435 comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
1436 if (comp_num_verts > 0) {
1437 // Transform vertices.
1438 for (i = 0; i < comp_num_verts; ++i) {
1439 stbtt_vertex* v = &comp_verts[i];
1440 stbtt_vertex_type x,y;
1441 x=v->x; y=v->y;
1442 v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
1443 v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
1444 x=v->cx; y=v->cy;
1445 v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
1446 v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
1447 }
1448 // Append vertices.
1449 tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata);
1450 if (!tmp) {
1451 if (vertices) STBTT_free(vertices, info->userdata);
1452 if (comp_verts) STBTT_free(comp_verts, info->userdata);
1453 return 0;
1454 }
1455 if (num_vertices > 0) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
1456 STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
1457 if (vertices) STBTT_free(vertices, info->userdata);
1458 vertices = tmp;
1459 STBTT_free(comp_verts, info->userdata);
1460 num_vertices += comp_num_verts;
1461 }
1462 // More components ?
1463 more = flags & (1<<5);
1464 }
1465 } else if (numberOfContours < 0) {
1466 // @TODO other compound variations?
1467 STBTT_assert(0);
1468 } else {
1469 // numberOfCounters == 0, do nothing
1470 }
1471
1472 *pvertices = vertices;
1473 return num_vertices;
1474 }
1475
stbtt_GetGlyphHMetrics(const stbtt_fontinfo * info,int glyph_index,int * advanceWidth,int * leftSideBearing)1476 STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing)
1477 {
1478 stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34);
1479 if (glyph_index < numOfLongHorMetrics) {
1480 if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*glyph_index);
1481 if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
1482 } else {
1483 if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
1484 if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
1485 }
1486 }
1487
stbtt_GetGlyphKernAdvance(const stbtt_fontinfo * info,int glyph1,int glyph2)1488 STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
1489 {
1490 stbtt_uint8 *data = info->data + info->kern;
1491 stbtt_uint32 needle, straw;
1492 int l, r, m;
1493
1494 // we only look at the first table. it must be 'horizontal' and format 0.
1495 if (!info->kern)
1496 return 0;
1497 if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
1498 return 0;
1499 if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
1500 return 0;
1501
1502 l = 0;
1503 r = ttUSHORT(data+10) - 1;
1504 needle = glyph1 << 16 | glyph2;
1505 while (l <= r) {
1506 m = (l + r) >> 1;
1507 straw = ttULONG(data+18+(m*6)); // note: unaligned read
1508 if (needle < straw)
1509 r = m - 1;
1510 else if (needle > straw)
1511 l = m + 1;
1512 else
1513 return ttSHORT(data+22+(m*6));
1514 }
1515 return 0;
1516 }
1517
stbtt_GetCodepointKernAdvance(const stbtt_fontinfo * info,int ch1,int ch2)1518 STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
1519 {
1520 if (!info->kern) // if no kerning table, don't waste time looking up both codepoint->glyphs
1521 return 0;
1522 return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2));
1523 }
1524
stbtt_GetCodepointHMetrics(const stbtt_fontinfo * info,int codepoint,int * advanceWidth,int * leftSideBearing)1525 STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
1526 {
1527 stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
1528 }
1529
stbtt_GetFontVMetrics(const stbtt_fontinfo * info,int * ascent,int * descent,int * lineGap)1530 STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap)
1531 {
1532 if (ascent ) *ascent = ttSHORT(info->data+info->hhea + 4);
1533 if (descent) *descent = ttSHORT(info->data+info->hhea + 6);
1534 if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
1535 }
1536
stbtt_GetFontBoundingBox(const stbtt_fontinfo * info,int * x0,int * y0,int * x1,int * y1)1537 STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1)
1538 {
1539 *x0 = ttSHORT(info->data + info->head + 36);
1540 *y0 = ttSHORT(info->data + info->head + 38);
1541 *x1 = ttSHORT(info->data + info->head + 40);
1542 *y1 = ttSHORT(info->data + info->head + 42);
1543 }
1544
stbtt_ScaleForPixelHeight(const stbtt_fontinfo * info,float height)1545 STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height)
1546 {
1547 int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6);
1548 return (float) height / fheight;
1549 }
1550
stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo * info,float pixels)1551 STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
1552 {
1553 int unitsPerEm = ttUSHORT(info->data + info->head + 18);
1554 return pixels / unitsPerEm;
1555 }
1556
stbtt_FreeShape(const stbtt_fontinfo * info,stbtt_vertex * v)1557 STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
1558 {
1559 STBTT_free(v, info->userdata);
1560 }
1561
1562 //////////////////////////////////////////////////////////////////////////////
1563 //
1564 // antialiasing software rasterizer
1565 //
1566
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)1567 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)
1568 {
1569 int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning
1570 if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
1571 // e.g. space character
1572 if (ix0) *ix0 = 0;
1573 if (iy0) *iy0 = 0;
1574 if (ix1) *ix1 = 0;
1575 if (iy1) *iy1 = 0;
1576 } else {
1577 // move to integral bboxes (treating pixels as little squares, what pixels get touched)?
1578 if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x);
1579 if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y);
1580 if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x);
1581 if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y);
1582 }
1583 }
1584
stbtt_GetGlyphBitmapBox(const stbtt_fontinfo * font,int glyph,float scale_x,float scale_y,int * ix0,int * iy0,int * ix1,int * iy1)1585 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)
1586 {
1587 stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
1588 }
1589
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)1590 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)
1591 {
1592 stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1);
1593 }
1594
stbtt_GetCodepointBitmapBox(const stbtt_fontinfo * font,int codepoint,float scale_x,float scale_y,int * ix0,int * iy0,int * ix1,int * iy1)1595 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)
1596 {
1597 stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1);
1598 }
1599
1600 //////////////////////////////////////////////////////////////////////////////
1601 //
1602 // Rasterizer
1603
1604 typedef struct stbtt__hheap_chunk
1605 {
1606 struct stbtt__hheap_chunk *next;
1607 } stbtt__hheap_chunk;
1608
1609 typedef struct stbtt__hheap
1610 {
1611 struct stbtt__hheap_chunk *head;
1612 void *first_free;
1613 int num_remaining_in_head_chunk;
1614 } stbtt__hheap;
1615
stbtt__hheap_alloc(stbtt__hheap * hh,size_t size,void * userdata)1616 static void *stbtt__hheap_alloc(stbtt__hheap *hh, size_t size, void *userdata)
1617 {
1618 if (hh->first_free) {
1619 void *p = hh->first_free;
1620 hh->first_free = * (void **) p;
1621 return p;
1622 } else {
1623 if (hh->num_remaining_in_head_chunk == 0) {
1624 int count = (size < 32 ? 2000 : size < 128 ? 800 : 100);
1625 stbtt__hheap_chunk *c = (stbtt__hheap_chunk *) STBTT_malloc(sizeof(stbtt__hheap_chunk) + size * count, userdata);
1626 if (c == NULL)
1627 return NULL;
1628 c->next = hh->head;
1629 hh->head = c;
1630 hh->num_remaining_in_head_chunk = count;
1631 }
1632 --hh->num_remaining_in_head_chunk;
1633 return (char *) (hh->head) + size * hh->num_remaining_in_head_chunk;
1634 }
1635 }
1636
stbtt__hheap_free(stbtt__hheap * hh,void * p)1637 static void stbtt__hheap_free(stbtt__hheap *hh, void *p)
1638 {
1639 *(void **) p = hh->first_free;
1640 hh->first_free = p;
1641 }
1642
stbtt__hheap_cleanup(stbtt__hheap * hh,void * userdata)1643 static void stbtt__hheap_cleanup(stbtt__hheap *hh, void *userdata)
1644 {
1645 stbtt__hheap_chunk *c = hh->head;
1646 while (c) {
1647 stbtt__hheap_chunk *n = c->next;
1648 STBTT_free(c, userdata);
1649 c = n;
1650 }
1651 }
1652
1653 typedef struct stbtt__edge {
1654 float x0,y0, x1,y1;
1655 int invert;
1656 } stbtt__edge;
1657
1658
1659 typedef struct stbtt__active_edge
1660 {
1661 struct stbtt__active_edge *next;
1662 #if STBTT_RASTERIZER_VERSION==1
1663 int x,dx;
1664 float ey;
1665 int direction;
1666 #elif STBTT_RASTERIZER_VERSION==2
1667 float fx,fdx,fdy;
1668 float direction;
1669 float sy;
1670 float ey;
1671 #else
1672 #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
1673 #endif
1674 } stbtt__active_edge;
1675
1676 #if STBTT_RASTERIZER_VERSION == 1
1677 #define STBTT_FIXSHIFT 10
1678 #define STBTT_FIX (1 << STBTT_FIXSHIFT)
1679 #define STBTT_FIXMASK (STBTT_FIX-1)
1680
stbtt__new_active(stbtt__hheap * hh,stbtt__edge * e,int off_x,float start_point,void * userdata)1681 static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
1682 {
1683 stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
1684 float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
1685 STBTT_assert(z != NULL);
1686 if (!z) return z;
1687
1688 // round dx down to avoid overshooting
1689 if (dxdy < 0)
1690 z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy);
1691 else
1692 z->dx = STBTT_ifloor(STBTT_FIX * dxdy);
1693
1694 z->x = STBTT_ifloor(STBTT_FIX * e->x0 + z->dx * (start_point - e->y0)); // use z->dx so when we offset later it's by the same amount
1695 z->x -= off_x * STBTT_FIX;
1696
1697 z->ey = e->y1;
1698 z->next = 0;
1699 z->direction = e->invert ? 1 : -1;
1700 return z;
1701 }
1702 #elif STBTT_RASTERIZER_VERSION == 2
stbtt__new_active(stbtt__hheap * hh,stbtt__edge * e,int off_x,float start_point,void * userdata)1703 static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
1704 {
1705 stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
1706 float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
1707 STBTT_assert(z != NULL);
1708 //STBTT_assert(e->y0 <= start_point);
1709 if (!z) return z;
1710 z->fdx = dxdy;
1711 z->fdy = dxdy != 0.0f ? (1.0f/dxdy) : 0.0f;
1712 z->fx = e->x0 + dxdy * (start_point - e->y0);
1713 z->fx -= off_x;
1714 z->direction = e->invert ? 1.0f : -1.0f;
1715 z->sy = e->y0;
1716 z->ey = e->y1;
1717 z->next = 0;
1718 return z;
1719 }
1720 #else
1721 #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
1722 #endif
1723
1724 #if STBTT_RASTERIZER_VERSION == 1
1725 // note: this routine clips fills that extend off the edges... ideally this
1726 // wouldn't happen, but it could happen if the truetype glyph bounding boxes
1727 // are wrong, or if the user supplies a too-small bitmap
stbtt__fill_active_edges(unsigned char * scanline,int len,stbtt__active_edge * e,int max_weight)1728 static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight)
1729 {
1730 // non-zero winding fill
1731 int x0=0, w=0;
1732
1733 while (e) {
1734 if (w == 0) {
1735 // if we're currently at zero, we need to record the edge start point
1736 x0 = e->x; w += e->direction;
1737 } else {
1738 int x1 = e->x; w += e->direction;
1739 // if we went to zero, we need to draw
1740 if (w == 0) {
1741 int i = x0 >> STBTT_FIXSHIFT;
1742 int j = x1 >> STBTT_FIXSHIFT;
1743
1744 if (i < len && j >= 0) {
1745 if (i == j) {
1746 // x0,x1 are the same pixel, so compute combined coverage
1747 scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> STBTT_FIXSHIFT);
1748 } else {
1749 if (i >= 0) // add antialiasing for x0
1750 scanline[i] = scanline[i] + (stbtt_uint8) (((STBTT_FIX - (x0 & STBTT_FIXMASK)) * max_weight) >> STBTT_FIXSHIFT);
1751 else
1752 i = -1; // clip
1753
1754 if (j < len) // add antialiasing for x1
1755 scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & STBTT_FIXMASK) * max_weight) >> STBTT_FIXSHIFT);
1756 else
1757 j = len; // clip
1758
1759 for (++i; i < j; ++i) // fill pixels between x0 and x1
1760 scanline[i] = scanline[i] + (stbtt_uint8) max_weight;
1761 }
1762 }
1763 }
1764 }
1765
1766 e = e->next;
1767 }
1768 }
1769
stbtt__rasterize_sorted_edges(stbtt__bitmap * result,stbtt__edge * e,int n,int vsubsample,int off_x,int off_y,void * userdata)1770 static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
1771 {
1772 stbtt__hheap hh = { 0, 0, 0 };
1773 stbtt__active_edge *active = NULL;
1774 int y,j=0;
1775 int max_weight = (255 / vsubsample); // weight per vertical scanline
1776 int s; // vertical subsample index
1777 unsigned char scanline_data[512], *scanline;
1778
1779 if (result->w > 512)
1780 scanline = (unsigned char *) STBTT_malloc(result->w, userdata);
1781 else
1782 scanline = scanline_data;
1783
1784 y = off_y * vsubsample;
1785 e[n].y0 = (off_y + result->h) * (float) vsubsample + 1;
1786
1787 while (j < result->h) {
1788 STBTT_memset(scanline, 0, result->w);
1789 for (s=0; s < vsubsample; ++s) {
1790 // find center of pixel for this scanline
1791 float scan_y = y + 0.5f;
1792 stbtt__active_edge **step = &active;
1793
1794 // update all active edges;
1795 // remove all active edges that terminate before the center of this scanline
1796 while (*step) {
1797 stbtt__active_edge * z = *step;
1798 if (z->ey <= scan_y) {
1799 *step = z->next; // delete from list
1800 STBTT_assert(z->direction);
1801 z->direction = 0;
1802 stbtt__hheap_free(&hh, z);
1803 } else {
1804 z->x += z->dx; // advance to position for current scanline
1805 step = &((*step)->next); // advance through list
1806 }
1807 }
1808
1809 // resort the list if needed
1810 for(;;) {
1811 int changed=0;
1812 step = &active;
1813 while (*step && (*step)->next) {
1814 if ((*step)->x > (*step)->next->x) {
1815 stbtt__active_edge *t = *step;
1816 stbtt__active_edge *q = t->next;
1817
1818 t->next = q->next;
1819 q->next = t;
1820 *step = q;
1821 changed = 1;
1822 }
1823 step = &(*step)->next;
1824 }
1825 if (!changed) break;
1826 }
1827
1828 // insert all edges that start before the center of this scanline -- omit ones that also end on this scanline
1829 while (e->y0 <= scan_y) {
1830 if (e->y1 > scan_y) {
1831 stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata);
1832 if (z != NULL) {
1833 // find insertion point
1834 if (active == NULL)
1835 active = z;
1836 else if (z->x < active->x) {
1837 // insert at front
1838 z->next = active;
1839 active = z;
1840 } else {
1841 // find thing to insert AFTER
1842 stbtt__active_edge *p = active;
1843 while (p->next && p->next->x < z->x)
1844 p = p->next;
1845 // at this point, p->next->x is NOT < z->x
1846 z->next = p->next;
1847 p->next = z;
1848 }
1849 }
1850 }
1851 ++e;
1852 }
1853
1854 // now process all active edges in XOR fashion
1855 if (active)
1856 stbtt__fill_active_edges(scanline, result->w, active, max_weight);
1857
1858 ++y;
1859 }
1860 STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w);
1861 ++j;
1862 }
1863
1864 stbtt__hheap_cleanup(&hh, userdata);
1865
1866 if (scanline != scanline_data)
1867 STBTT_free(scanline, userdata);
1868 }
1869
1870 #elif STBTT_RASTERIZER_VERSION == 2
1871
1872 // the edge passed in here does not cross the vertical line at x or the vertical line at x+1
1873 // (i.e. it has already been clipped to those)
stbtt__handle_clipped_edge(float * scanline,int x,stbtt__active_edge * e,float x0,float y0,float x1,float y1)1874 static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edge *e, float x0, float y0, float x1, float y1)
1875 {
1876 if (y0 == y1) return;
1877 STBTT_assert(y0 < y1);
1878 STBTT_assert(e->sy <= e->ey);
1879 if (y0 > e->ey) return;
1880 if (y1 < e->sy) return;
1881 if (y0 < e->sy) {
1882 x0 += (x1-x0) * (e->sy - y0) / (y1-y0);
1883 y0 = e->sy;
1884 }
1885 if (y1 > e->ey) {
1886 x1 += (x1-x0) * (e->ey - y1) / (y1-y0);
1887 y1 = e->ey;
1888 }
1889
1890 if (x0 == x)
1891 STBTT_assert(x1 <= x+1);
1892 else if (x0 == x+1)
1893 STBTT_assert(x1 >= x);
1894 else if (x0 <= x)
1895 STBTT_assert(x1 <= x);
1896 else if (x0 >= x+1)
1897 STBTT_assert(x1 >= x+1);
1898 else
1899 STBTT_assert(x1 >= x && x1 <= x+1);
1900
1901 if (x0 <= x && x1 <= x)
1902 scanline[x] += e->direction * (y1-y0);
1903 else if (x0 >= x+1 && x1 >= x+1)
1904 ;
1905 else {
1906 STBTT_assert(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1);
1907 scanline[x] += e->direction * (y1-y0) * (1-((x0-x)+(x1-x))/2); // coverage = 1 - average x position
1908 }
1909 }
1910
stbtt__fill_active_edges_new(float * scanline,float * scanline_fill,int len,stbtt__active_edge * e,float y_top)1911 static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top)
1912 {
1913 float y_bottom = y_top+1;
1914
1915 while (e) {
1916 // brute force every pixel
1917
1918 // compute intersection points with top & bottom
1919 STBTT_assert(e->ey >= y_top);
1920
1921 if (e->fdx == 0) {
1922 float x0 = e->fx;
1923 if (x0 < len) {
1924 if (x0 >= 0) {
1925 stbtt__handle_clipped_edge(scanline,(int) x0,e, x0,y_top, x0,y_bottom);
1926 stbtt__handle_clipped_edge(scanline_fill-1,(int) x0+1,e, x0,y_top, x0,y_bottom);
1927 } else {
1928 stbtt__handle_clipped_edge(scanline_fill-1,0,e, x0,y_top, x0,y_bottom);
1929 }
1930 }
1931 } else {
1932 float x0 = e->fx;
1933 float dx = e->fdx;
1934 float xb = x0 + dx;
1935 float x_top, x_bottom;
1936 float sy0,sy1;
1937 float dy = e->fdy;
1938 STBTT_assert(e->sy <= y_bottom && e->ey >= y_top);
1939
1940 // compute endpoints of line segment clipped to this scanline (if the
1941 // line segment starts on this scanline. x0 is the intersection of the
1942 // line with y_top, but that may be off the line segment.
1943 if (e->sy > y_top) {
1944 x_top = x0 + dx * (e->sy - y_top);
1945 sy0 = e->sy;
1946 } else {
1947 x_top = x0;
1948 sy0 = y_top;
1949 }
1950 if (e->ey < y_bottom) {
1951 x_bottom = x0 + dx * (e->ey - y_top);
1952 sy1 = e->ey;
1953 } else {
1954 x_bottom = xb;
1955 sy1 = y_bottom;
1956 }
1957
1958 if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) {
1959 // from here on, we don't have to range check x values
1960
1961 if ((int) x_top == (int) x_bottom) {
1962 float height;
1963 // simple case, only spans one pixel
1964 int x = (int) x_top;
1965 height = sy1 - sy0;
1966 STBTT_assert(x >= 0 && x < len);
1967 scanline[x] += e->direction * (1-((x_top - x) + (x_bottom-x))/2) * height;
1968 scanline_fill[x] += e->direction * height; // everything right of this pixel is filled
1969 } else {
1970 int x,x1,x2;
1971 float y_crossing, step, sign, area;
1972 // covers 2+ pixels
1973 if (x_top > x_bottom) {
1974 // flip scanline vertically; signed area is the same
1975 float t;
1976 sy0 = y_bottom - (sy0 - y_top);
1977 sy1 = y_bottom - (sy1 - y_top);
1978 t = sy0, sy0 = sy1, sy1 = t;
1979 t = x_bottom, x_bottom = x_top, x_top = t;
1980 dx = -dx;
1981 dy = -dy;
1982 t = x0, x0 = xb, xb = t;
1983 }
1984
1985 x1 = (int) x_top;
1986 x2 = (int) x_bottom;
1987 // compute intersection with y axis at x1+1
1988 y_crossing = (x1+1 - x0) * dy + y_top;
1989
1990 sign = e->direction;
1991 // area of the rectangle covered from y0..y_crossing
1992 area = sign * (y_crossing-sy0);
1993 // area of the triangle (x_top,y0), (x+1,y0), (x+1,y_crossing)
1994 scanline[x1] += area * (1-((x_top - x1)+(x1+1-x1))/2);
1995
1996 step = sign * dy;
1997 for (x = x1+1; x < x2; ++x) {
1998 scanline[x] += area + step/2;
1999 area += step;
2000 }
2001 y_crossing += dy * (x2 - (x1+1));
2002
2003 STBTT_assert(STBTT_fabs(area) <= 1.01f);
2004
2005 scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (sy1-y_crossing);
2006
2007 scanline_fill[x2] += sign * (sy1-sy0);
2008 }
2009 } else {
2010 // if edge goes outside of box we're drawing, we require
2011 // clipping logic. since this does not match the intended use
2012 // of this library, we use a different, very slow brute
2013 // force implementation
2014 int x;
2015 for (x=0; x < len; ++x) {
2016 // cases:
2017 //
2018 // there can be up to two intersections with the pixel. any intersection
2019 // with left or right edges can be handled by splitting into two (or three)
2020 // regions. intersections with top & bottom do not necessitate case-wise logic.
2021 //
2022 // the old way of doing this found the intersections with the left & right edges,
2023 // then used some simple logic to produce up to three segments in sorted order
2024 // from top-to-bottom. however, this had a problem: if an x edge was epsilon
2025 // across the x border, then the corresponding y position might not be distinct
2026 // from the other y segment, and it might ignored as an empty segment. to avoid
2027 // that, we need to explicitly produce segments based on x positions.
2028
2029 // rename variables to clear pairs
2030 float y0 = y_top;
2031 float x1 = (float) (x);
2032 float x2 = (float) (x+1);
2033 float x3 = xb;
2034 float y3 = y_bottom;
2035 float y1,y2;
2036
2037 // x = e->x + e->dx * (y-y_top)
2038 // (y-y_top) = (x - e->x) / e->dx
2039 // y = (x - e->x) / e->dx + y_top
2040 y1 = (x - x0) / dx + y_top;
2041 y2 = (x+1 - x0) / dx + y_top;
2042
2043 if (x0 < x1 && x3 > x2) { // three segments descending down-right
2044 stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
2045 stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x2,y2);
2046 stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
2047 } else if (x3 < x1 && x0 > x2) { // three segments descending down-left
2048 stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
2049 stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x1,y1);
2050 stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
2051 } else if (x0 < x1 && x3 > x1) { // two segments across x, down-right
2052 stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
2053 stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
2054 } else if (x3 < x1 && x0 > x1) { // two segments across x, down-left
2055 stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
2056 stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
2057 } else if (x0 < x2 && x3 > x2) { // two segments across x+1, down-right
2058 stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
2059 stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
2060 } else if (x3 < x2 && x0 > x2) { // two segments across x+1, down-left
2061 stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
2062 stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
2063 } else { // one segment
2064 stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x3,y3);
2065 }
2066 }
2067 }
2068 }
2069 e = e->next;
2070 }
2071 }
2072
2073 // directly AA rasterize edges w/o supersampling
stbtt__rasterize_sorted_edges(stbtt__bitmap * result,stbtt__edge * e,int n,int vsubsample,int off_x,int off_y,void * userdata)2074 static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
2075 {
2076 (void)vsubsample;
2077 stbtt__hheap hh = { 0, 0, 0 };
2078 stbtt__active_edge *active = NULL;
2079 int y,j=0, i;
2080 float scanline_data[129], *scanline, *scanline2;
2081
2082 if (result->w > 64)
2083 scanline = (float *) STBTT_malloc((result->w*2+1) * sizeof(float), userdata);
2084 else
2085 scanline = scanline_data;
2086
2087 scanline2 = scanline + result->w;
2088
2089 y = off_y;
2090 e[n].y0 = (float) (off_y + result->h) + 1;
2091
2092 while (j < result->h) {
2093 // find center of pixel for this scanline
2094 float scan_y_top = y + 0.0f;
2095 float scan_y_bottom = y + 1.0f;
2096 stbtt__active_edge **step = &active;
2097
2098 STBTT_memset(scanline , 0, result->w*sizeof(scanline[0]));
2099 STBTT_memset(scanline2, 0, (result->w+1)*sizeof(scanline[0]));
2100
2101 // update all active edges;
2102 // remove all active edges that terminate before the top of this scanline
2103 while (*step) {
2104 stbtt__active_edge * z = *step;
2105 if (z->ey <= scan_y_top) {
2106 *step = z->next; // delete from list
2107 STBTT_assert(z->direction);
2108 z->direction = 0;
2109 stbtt__hheap_free(&hh, z);
2110 } else {
2111 step = &((*step)->next); // advance through list
2112 }
2113 }
2114
2115 // insert all edges that start before the bottom of this scanline
2116 while (e->y0 <= scan_y_bottom) {
2117 if (e->y0 != e->y1) {
2118 stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata);
2119 if (z != NULL) {
2120 STBTT_assert(z->ey >= scan_y_top);
2121 // insert at front
2122 z->next = active;
2123 active = z;
2124 }
2125 }
2126 ++e;
2127 }
2128
2129 // now process all active edges
2130 if (active)
2131 stbtt__fill_active_edges_new(scanline, scanline2+1, result->w, active, scan_y_top);
2132
2133 {
2134 float sum = 0;
2135 for (i=0; i < result->w; ++i) {
2136 float k;
2137 int m;
2138 sum += scanline2[i];
2139 k = scanline[i] + sum;
2140 k = (float) STBTT_fabs(k)*255 + 0.5f;
2141 m = (int) k;
2142 if (m > 255) m = 255;
2143 result->pixels[j*result->stride + i] = (unsigned char) m;
2144 }
2145 }
2146 // advance all the edges
2147 step = &active;
2148 while (*step) {
2149 stbtt__active_edge *z = *step;
2150 z->fx += z->fdx; // advance to position for current scanline
2151 step = &((*step)->next); // advance through list
2152 }
2153
2154 ++y;
2155 ++j;
2156 }
2157
2158 stbtt__hheap_cleanup(&hh, userdata);
2159
2160 if (scanline != scanline_data)
2161 STBTT_free(scanline, userdata);
2162 }
2163 #else
2164 #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
2165 #endif
2166
2167 #define STBTT__COMPARE(a,b) ((a)->y0 < (b)->y0)
2168
stbtt__sort_edges_ins_sort(stbtt__edge * p,int n)2169 static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n)
2170 {
2171 int i,j;
2172 for (i=1; i < n; ++i) {
2173 stbtt__edge t = p[i], *a = &t;
2174 j = i;
2175 while (j > 0) {
2176 stbtt__edge *b = &p[j-1];
2177 int c = STBTT__COMPARE(a,b);
2178 if (!c) break;
2179 p[j] = p[j-1];
2180 --j;
2181 }
2182 if (i != j)
2183 p[j] = t;
2184 }
2185 }
2186
stbtt__sort_edges_quicksort(stbtt__edge * p,int n)2187 static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n)
2188 {
2189 /* threshhold for transitioning to insertion sort */
2190 while (n > 12) {
2191 stbtt__edge t;
2192 int c01,c12,c,m,i,j;
2193
2194 /* compute median of three */
2195 m = n >> 1;
2196 c01 = STBTT__COMPARE(&p[0],&p[m]);
2197 c12 = STBTT__COMPARE(&p[m],&p[n-1]);
2198 /* if 0 >= mid >= end, or 0 < mid < end, then use mid */
2199 if (c01 != c12) {
2200 /* otherwise, we'll need to swap something else to middle */
2201 int z;
2202 c = STBTT__COMPARE(&p[0],&p[n-1]);
2203 /* 0>mid && mid<n: 0>n => n; 0<n => 0 */
2204 /* 0<mid && mid>n: 0>n => 0; 0<n => n */
2205 z = (c == c12) ? 0 : n-1;
2206 t = p[z];
2207 p[z] = p[m];
2208 p[m] = t;
2209 }
2210 /* now p[m] is the median-of-three */
2211 /* swap it to the beginning so it won't move around */
2212 t = p[0];
2213 p[0] = p[m];
2214 p[m] = t;
2215
2216 /* partition loop */
2217 i=1;
2218 j=n-1;
2219 for(;;) {
2220 /* handling of equality is crucial here */
2221 /* for sentinels & efficiency with duplicates */
2222 for (;;++i) {
2223 if (!STBTT__COMPARE(&p[i], &p[0])) break;
2224 }
2225 for (;;--j) {
2226 if (!STBTT__COMPARE(&p[0], &p[j])) break;
2227 }
2228 /* make sure we haven't crossed */
2229 if (i >= j) break;
2230 t = p[i];
2231 p[i] = p[j];
2232 p[j] = t;
2233
2234 ++i;
2235 --j;
2236 }
2237 /* recurse on smaller side, iterate on larger */
2238 if (j < (n-i)) {
2239 stbtt__sort_edges_quicksort(p,j);
2240 p = p+i;
2241 n = n-i;
2242 } else {
2243 stbtt__sort_edges_quicksort(p+i, n-i);
2244 n = j;
2245 }
2246 }
2247 }
2248
stbtt__sort_edges(stbtt__edge * p,int n)2249 static void stbtt__sort_edges(stbtt__edge *p, int n)
2250 {
2251 stbtt__sort_edges_quicksort(p, n);
2252 stbtt__sort_edges_ins_sort(p, n);
2253 }
2254
2255 typedef struct
2256 {
2257 float x,y;
2258 } stbtt__point;
2259
stbtt__rasterize(stbtt__bitmap * result,stbtt__point * pts,int * wcount,int windings,float scale_x,float scale_y,float shift_x,float shift_y,int off_x,int off_y,int invert,void * userdata)2260 static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata)
2261 {
2262 float y_scale_inv = invert ? -scale_y : scale_y;
2263 stbtt__edge *e;
2264 int n,i,j,k,m;
2265 #if STBTT_RASTERIZER_VERSION == 1
2266 int vsubsample = result->h < 8 ? 15 : 5;
2267 #elif STBTT_RASTERIZER_VERSION == 2
2268 int vsubsample = 1;
2269 #else
2270 #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
2271 #endif
2272 // vsubsample should divide 255 evenly; otherwise we won't reach full opacity
2273
2274 // now we have to blow out the windings into explicit edge lists
2275 n = 0;
2276 for (i=0; i < windings; ++i)
2277 n += wcount[i];
2278
2279 e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel
2280 if (e == 0) return;
2281 n = 0;
2282
2283 m=0;
2284 for (i=0; i < windings; ++i) {
2285 stbtt__point *p = pts + m;
2286 m += wcount[i];
2287 j = wcount[i]-1;
2288 for (k=0; k < wcount[i]; j=k++) {
2289 int a=k,b=j;
2290 // skip the edge if horizontal
2291 if (p[j].y == p[k].y)
2292 continue;
2293 // add edge from j to k to the list
2294 e[n].invert = 0;
2295 if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
2296 e[n].invert = 1;
2297 a=j,b=k;
2298 }
2299 e[n].x0 = p[a].x * scale_x + shift_x;
2300 e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample;
2301 e[n].x1 = p[b].x * scale_x + shift_x;
2302 e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample;
2303 ++n;
2304 }
2305 }
2306
2307 // now sort the edges by their highest point (should snap to integer, and then by x)
2308 //STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare);
2309 stbtt__sort_edges(e, n);
2310
2311 // now, traverse the scanlines and find the intersections on each scanline, use xor winding rule
2312 stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata);
2313
2314 STBTT_free(e, userdata);
2315 }
2316
stbtt__add_point(stbtt__point * points,int n,float x,float y)2317 static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
2318 {
2319 if (!points) return; // during first pass, it's unallocated
2320 points[n].x = x;
2321 points[n].y = y;
2322 }
2323
2324 // tesselate until threshhold p is happy... @TODO warped to compensate for non-linear stretching
stbtt__tesselate_curve(stbtt__point * points,int * num_points,float x0,float y0,float x1,float y1,float x2,float y2,float objspace_flatness_squared,int n)2325 static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
2326 {
2327 // midpoint
2328 float mx = (x0 + 2*x1 + x2)/4;
2329 float my = (y0 + 2*y1 + y2)/4;
2330 // versus directly drawn line
2331 float dx = (x0+x2)/2 - mx;
2332 float dy = (y0+y2)/2 - my;
2333 if (n > 16) // 65536 segments on one curve better be enough!
2334 return 1;
2335 if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA
2336 stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
2337 stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
2338 } else {
2339 stbtt__add_point(points, *num_points,x2,y2);
2340 *num_points = *num_points+1;
2341 }
2342 return 1;
2343 }
2344
2345 // returns number of contours
stbtt_FlattenCurves(stbtt_vertex * vertices,int num_verts,float objspace_flatness,int ** contour_lengths,int * num_contours,void * userdata)2346 static stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata)
2347 {
2348 stbtt__point *points=0;
2349 int num_points=0;
2350
2351 float objspace_flatness_squared = objspace_flatness * objspace_flatness;
2352 int i,n=0,start=0, pass;
2353
2354 // count how many "moves" there are to get the contour count
2355 for (i=0; i < num_verts; ++i)
2356 if (vertices[i].type == STBTT_vmove)
2357 ++n;
2358
2359 *num_contours = n;
2360 if (n == 0) return 0;
2361
2362 *contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata);
2363
2364 if (*contour_lengths == 0) {
2365 *num_contours = 0;
2366 return 0;
2367 }
2368
2369 // make two passes through the points so we don't need to realloc
2370 for (pass=0; pass < 2; ++pass) {
2371 float x=0,y=0;
2372 if (pass == 1) {
2373 points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata);
2374 if (points == NULL) goto error;
2375 }
2376 num_points = 0;
2377 n= -1;
2378 for (i=0; i < num_verts; ++i) {
2379 switch (vertices[i].type) {
2380 case STBTT_vmove:
2381 // start the next contour
2382 if (n >= 0)
2383 (*contour_lengths)[n] = num_points - start;
2384 ++n;
2385 start = num_points;
2386
2387 x = vertices[i].x, y = vertices[i].y;
2388 stbtt__add_point(points, num_points++, x,y);
2389 break;
2390 case STBTT_vline:
2391 x = vertices[i].x, y = vertices[i].y;
2392 stbtt__add_point(points, num_points++, x, y);
2393 break;
2394 case STBTT_vcurve:
2395 stbtt__tesselate_curve(points, &num_points, x,y,
2396 vertices[i].cx, vertices[i].cy,
2397 vertices[i].x, vertices[i].y,
2398 objspace_flatness_squared, 0);
2399 x = vertices[i].x, y = vertices[i].y;
2400 break;
2401 }
2402 }
2403 (*contour_lengths)[n] = num_points - start;
2404 }
2405
2406 return points;
2407 error:
2408 STBTT_free(points, userdata);
2409 STBTT_free(*contour_lengths, userdata);
2410 *contour_lengths = 0;
2411 *num_contours = 0;
2412 return NULL;
2413 }
2414
stbtt_Rasterize(stbtt__bitmap * result,float flatness_in_pixels,stbtt_vertex * vertices,int num_verts,float scale_x,float scale_y,float shift_x,float shift_y,int x_off,int y_off,int invert,void * userdata)2415 STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata)
2416 {
2417 float scale = scale_x > scale_y ? scale_y : scale_x;
2418 int winding_count, *winding_lengths;
2419 stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata);
2420 if (windings) {
2421 stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata);
2422 STBTT_free(winding_lengths, userdata);
2423 STBTT_free(windings, userdata);
2424 }
2425 }
2426
stbtt_FreeBitmap(unsigned char * bitmap,void * userdata)2427 STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
2428 {
2429 STBTT_free(bitmap, userdata);
2430 }
2431
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)2432 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)
2433 {
2434 int ix0,iy0,ix1,iy1;
2435 stbtt__bitmap gbm;
2436 stbtt_vertex *vertices;
2437 int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
2438
2439 if (scale_x == 0) scale_x = scale_y;
2440 if (scale_y == 0) {
2441 if (scale_x == 0) {
2442 STBTT_free(vertices, info->userdata);
2443 return NULL;
2444 }
2445 scale_y = scale_x;
2446 }
2447
2448 stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1);
2449
2450 // now we get the size
2451 gbm.w = (ix1 - ix0);
2452 gbm.h = (iy1 - iy0);
2453 gbm.pixels = NULL; // in case we error
2454
2455 if (width ) *width = gbm.w;
2456 if (height) *height = gbm.h;
2457 if (xoff ) *xoff = ix0;
2458 if (yoff ) *yoff = iy0;
2459
2460 if (gbm.w && gbm.h) {
2461 gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
2462 if (gbm.pixels) {
2463 gbm.stride = gbm.w;
2464
2465 stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata);
2466 }
2467 }
2468 STBTT_free(vertices, info->userdata);
2469 return gbm.pixels;
2470 }
2471
stbtt_GetGlyphBitmap(const stbtt_fontinfo * info,float scale_x,float scale_y,int glyph,int * width,int * height,int * xoff,int * yoff)2472 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)
2473 {
2474 return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff);
2475 }
2476
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)2477 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)
2478 {
2479 int ix0,iy0;
2480 stbtt_vertex *vertices;
2481 int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
2482 stbtt__bitmap gbm;
2483
2484 stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0);
2485 gbm.pixels = output;
2486 gbm.w = out_w;
2487 gbm.h = out_h;
2488 gbm.stride = out_stride;
2489
2490 if (gbm.w && gbm.h)
2491 stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata);
2492
2493 STBTT_free(vertices, info->userdata);
2494 }
2495
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)2496 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)
2497 {
2498 stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph);
2499 }
2500
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)2501 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)
2502 {
2503 return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff);
2504 }
2505
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)2506 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)
2507 {
2508 stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint));
2509 }
2510
stbtt_GetCodepointBitmap(const stbtt_fontinfo * info,float scale_x,float scale_y,int codepoint,int * width,int * height,int * xoff,int * yoff)2511 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)
2512 {
2513 return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff);
2514 }
2515
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)2516 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)
2517 {
2518 stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint);
2519 }
2520
2521 //////////////////////////////////////////////////////////////////////////////
2522 //
2523 // bitmap baking
2524 //
2525 // This is SUPER-CRAPPY packing to keep source code small
2526
stbtt_BakeFontBitmap(const unsigned char * data,int offset,float pixel_height,unsigned char * pixels,int pw,int ph,int first_char,int num_chars,stbtt_bakedchar * chardata)2527 STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf)
2528 float pixel_height, // height of font in pixels
2529 unsigned char *pixels, int pw, int ph, // bitmap to be filled in
2530 int first_char, int num_chars, // characters to bake
2531 stbtt_bakedchar *chardata)
2532 {
2533 float scale;
2534 int x,y,bottom_y, i;
2535 stbtt_fontinfo f;
2536 f.userdata = NULL;
2537 if (!stbtt_InitFont(&f, data, offset))
2538 return -1;
2539 STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
2540 x=y=1;
2541 bottom_y = 1;
2542
2543 scale = stbtt_ScaleForPixelHeight(&f, pixel_height);
2544
2545 for (i=0; i < num_chars; ++i) {
2546 int advance, lsb, x0,y0,x1,y1,gw,gh;
2547 int g = stbtt_FindGlyphIndex(&f, first_char + i);
2548 stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb);
2549 stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1);
2550 gw = x1-x0;
2551 gh = y1-y0;
2552 if (x + gw + 1 >= pw)
2553 y = bottom_y, x = 1; // advance to next row
2554 if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row
2555 return -i;
2556 STBTT_assert(x+gw < pw);
2557 STBTT_assert(y+gh < ph);
2558 stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g);
2559 chardata[i].x0 = (stbtt_int16) x;
2560 chardata[i].y0 = (stbtt_int16) y;
2561 chardata[i].x1 = (stbtt_int16) (x + gw);
2562 chardata[i].y1 = (stbtt_int16) (y + gh);
2563 chardata[i].xadvance = scale * advance;
2564 chardata[i].xoff = (float) x0;
2565 chardata[i].yoff = (float) y0;
2566 x = x + gw + 1;
2567 if (y+gh+1 > bottom_y)
2568 bottom_y = y+gh+1;
2569 }
2570 return bottom_y;
2571 }
2572
stbtt_GetBakedQuad(stbtt_bakedchar * chardata,int pw,int ph,int char_index,float * xpos,float * ypos,stbtt_aligned_quad * q,int opengl_fillrule)2573 STBTT_DEF void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
2574 {
2575 float d3d_bias = opengl_fillrule ? 0 : -0.5f;
2576 float ipw = 1.0f / pw, iph = 1.0f / ph;
2577 stbtt_bakedchar *b = chardata + char_index;
2578 int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f);
2579 int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f);
2580
2581 q->x0 = round_x + d3d_bias;
2582 q->y0 = round_y + d3d_bias;
2583 q->x1 = round_x + b->x1 - b->x0 + d3d_bias;
2584 q->y1 = round_y + b->y1 - b->y0 + d3d_bias;
2585
2586 q->s0 = b->x0 * ipw;
2587 q->t0 = b->y0 * iph;
2588 q->s1 = b->x1 * ipw;
2589 q->t1 = b->y1 * iph;
2590
2591 *xpos += b->xadvance;
2592 }
2593
2594 //////////////////////////////////////////////////////////////////////////////
2595 //
2596 // rectangle packing replacement routines if you don't have stb_rect_pack.h
2597 //
2598
2599 #ifndef STB_RECT_PACK_VERSION
2600 #ifdef _MSC_VER
2601 #define STBTT__NOTUSED(v) (void)(v)
2602 #else
2603 #define STBTT__NOTUSED(v) (void)sizeof(v)
2604 #endif
2605
2606 typedef int stbrp_coord;
2607
2608 ////////////////////////////////////////////////////////////////////////////////////
2609 // //
2610 // //
2611 // COMPILER WARNING ?!?!? //
2612 // //
2613 // //
2614 // if you get a compile warning due to these symbols being defined more than //
2615 // once, move #include "stb_rect_pack.h" before #include "stb_truetype.h" //
2616 // //
2617 ////////////////////////////////////////////////////////////////////////////////////
2618
2619 typedef struct
2620 {
2621 int width,height;
2622 int x,y,bottom_y;
2623 } stbrp_context;
2624
2625 typedef struct
2626 {
2627 unsigned char x;
2628 } stbrp_node;
2629
2630 struct stbrp_rect
2631 {
2632 stbrp_coord x,y;
2633 int id,w,h,was_packed;
2634 };
2635
stbrp_init_target(stbrp_context * con,int pw,int ph,stbrp_node * nodes,int num_nodes)2636 static void stbrp_init_target(stbrp_context *con, int pw, int ph, stbrp_node *nodes, int num_nodes)
2637 {
2638 con->width = pw;
2639 con->height = ph;
2640 con->x = 0;
2641 con->y = 0;
2642 con->bottom_y = 0;
2643 STBTT__NOTUSED(nodes);
2644 STBTT__NOTUSED(num_nodes);
2645 }
2646
stbrp_pack_rects(stbrp_context * con,stbrp_rect * rects,int num_rects)2647 static void stbrp_pack_rects(stbrp_context *con, stbrp_rect *rects, int num_rects)
2648 {
2649 int i;
2650 for (i=0; i < num_rects; ++i) {
2651 if (con->x + rects[i].w > con->width) {
2652 con->x = 0;
2653 con->y = con->bottom_y;
2654 }
2655 if (con->y + rects[i].h > con->height)
2656 break;
2657 rects[i].x = con->x;
2658 rects[i].y = con->y;
2659 rects[i].was_packed = 1;
2660 con->x += rects[i].w;
2661 if (con->y + rects[i].h > con->bottom_y)
2662 con->bottom_y = con->y + rects[i].h;
2663 }
2664 for ( ; i < num_rects; ++i)
2665 rects[i].was_packed = 0;
2666 }
2667 #endif
2668
2669 //////////////////////////////////////////////////////////////////////////////
2670 //
2671 // bitmap baking
2672 //
2673 // This is SUPER-AWESOME (tm Ryan Gordon) packing using stb_rect_pack.h. If
2674 // stb_rect_pack.h isn't available, it uses the BakeFontBitmap strategy.
2675
stbtt_PackBegin(stbtt_pack_context * spc,unsigned char * pixels,int pw,int ph,int stride_in_bytes,int padding,void * alloc_context)2676 STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int pw, int ph, int stride_in_bytes, int padding, void *alloc_context)
2677 {
2678 stbrp_context *context = (stbrp_context *) STBTT_malloc(sizeof(*context) ,alloc_context);
2679 int num_nodes = pw - padding;
2680 stbrp_node *nodes = (stbrp_node *) STBTT_malloc(sizeof(*nodes ) * num_nodes,alloc_context);
2681
2682 if (context == NULL || nodes == NULL) {
2683 if (context != NULL) STBTT_free(context, alloc_context);
2684 if (nodes != NULL) STBTT_free(nodes , alloc_context);
2685 return 0;
2686 }
2687
2688 spc->user_allocator_context = alloc_context;
2689 spc->width = pw;
2690 spc->height = ph;
2691 spc->pixels = pixels;
2692 spc->pack_info = context;
2693 spc->nodes = nodes;
2694 spc->padding = padding;
2695 spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw;
2696 spc->h_oversample = 1;
2697 spc->v_oversample = 1;
2698
2699 stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
2700
2701 if (pixels)
2702 STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
2703
2704 return 1;
2705 }
2706
stbtt_PackEnd(stbtt_pack_context * spc)2707 STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc)
2708 {
2709 STBTT_free(spc->nodes , spc->user_allocator_context);
2710 STBTT_free(spc->pack_info, spc->user_allocator_context);
2711 }
2712
stbtt_PackSetOversampling(stbtt_pack_context * spc,unsigned int h_oversample,unsigned int v_oversample)2713 STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample)
2714 {
2715 STBTT_assert(h_oversample <= STBTT_MAX_OVERSAMPLE);
2716 STBTT_assert(v_oversample <= STBTT_MAX_OVERSAMPLE);
2717 if (h_oversample <= STBTT_MAX_OVERSAMPLE)
2718 spc->h_oversample = h_oversample;
2719 if (v_oversample <= STBTT_MAX_OVERSAMPLE)
2720 spc->v_oversample = v_oversample;
2721 }
2722
2723 #define STBTT__OVER_MASK (STBTT_MAX_OVERSAMPLE-1)
2724
stbtt__h_prefilter(unsigned char * pixels,int w,int h,int stride_in_bytes,unsigned int kernel_width)2725 static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
2726 {
2727 unsigned char buffer[STBTT_MAX_OVERSAMPLE];
2728 int safe_w = w - kernel_width;
2729 int j;
2730 STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
2731 for (j=0; j < h; ++j) {
2732 int i;
2733 unsigned int total;
2734 STBTT_memset(buffer, 0, kernel_width);
2735
2736 total = 0;
2737
2738 // make kernel_width a constant in common cases so compiler can optimize out the divide
2739 switch (kernel_width) {
2740 case 2:
2741 for (i=0; i <= safe_w; ++i) {
2742 total += pixels[i] - buffer[i & STBTT__OVER_MASK];
2743 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
2744 pixels[i] = (unsigned char) (total / 2);
2745 }
2746 break;
2747 case 3:
2748 for (i=0; i <= safe_w; ++i) {
2749 total += pixels[i] - buffer[i & STBTT__OVER_MASK];
2750 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
2751 pixels[i] = (unsigned char) (total / 3);
2752 }
2753 break;
2754 case 4:
2755 for (i=0; i <= safe_w; ++i) {
2756 total += pixels[i] - buffer[i & STBTT__OVER_MASK];
2757 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
2758 pixels[i] = (unsigned char) (total / 4);
2759 }
2760 break;
2761 case 5:
2762 for (i=0; i <= safe_w; ++i) {
2763 total += pixels[i] - buffer[i & STBTT__OVER_MASK];
2764 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
2765 pixels[i] = (unsigned char) (total / 5);
2766 }
2767 break;
2768 default:
2769 for (i=0; i <= safe_w; ++i) {
2770 total += pixels[i] - buffer[i & STBTT__OVER_MASK];
2771 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
2772 pixels[i] = (unsigned char) (total / kernel_width);
2773 }
2774 break;
2775 }
2776
2777 for (; i < w; ++i) {
2778 STBTT_assert(pixels[i] == 0);
2779 total -= buffer[i & STBTT__OVER_MASK];
2780 pixels[i] = (unsigned char) (total / kernel_width);
2781 }
2782
2783 pixels += stride_in_bytes;
2784 }
2785 }
2786
stbtt__v_prefilter(unsigned char * pixels,int w,int h,int stride_in_bytes,unsigned int kernel_width)2787 static void stbtt__v_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
2788 {
2789 unsigned char buffer[STBTT_MAX_OVERSAMPLE];
2790 int safe_h = h - kernel_width;
2791 int j;
2792 STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
2793 for (j=0; j < w; ++j) {
2794 int i;
2795 unsigned int total;
2796 STBTT_memset(buffer, 0, kernel_width);
2797
2798 total = 0;
2799
2800 // make kernel_width a constant in common cases so compiler can optimize out the divide
2801 switch (kernel_width) {
2802 case 2:
2803 for (i=0; i <= safe_h; ++i) {
2804 total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
2805 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
2806 pixels[i*stride_in_bytes] = (unsigned char) (total / 2);
2807 }
2808 break;
2809 case 3:
2810 for (i=0; i <= safe_h; ++i) {
2811 total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
2812 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
2813 pixels[i*stride_in_bytes] = (unsigned char) (total / 3);
2814 }
2815 break;
2816 case 4:
2817 for (i=0; i <= safe_h; ++i) {
2818 total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
2819 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
2820 pixels[i*stride_in_bytes] = (unsigned char) (total / 4);
2821 }
2822 break;
2823 case 5:
2824 for (i=0; i <= safe_h; ++i) {
2825 total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
2826 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
2827 pixels[i*stride_in_bytes] = (unsigned char) (total / 5);
2828 }
2829 break;
2830 default:
2831 for (i=0; i <= safe_h; ++i) {
2832 total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
2833 buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
2834 pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
2835 }
2836 break;
2837 }
2838
2839 for (; i < h; ++i) {
2840 STBTT_assert(pixels[i*stride_in_bytes] == 0);
2841 total -= buffer[i & STBTT__OVER_MASK];
2842 pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
2843 }
2844
2845 pixels += 1;
2846 }
2847 }
2848
stbtt__oversample_shift(int oversample)2849 static float stbtt__oversample_shift(int oversample)
2850 {
2851 if (!oversample)
2852 return 0.0f;
2853
2854 // The prefilter is a box filter of width "oversample",
2855 // which shifts phase by (oversample - 1)/2 pixels in
2856 // oversampled space. We want to shift in the opposite
2857 // direction to counter this.
2858 return (float)-(oversample - 1) / (2.0f * (float)oversample);
2859 }
2860
2861 // rects array must be big enough to accommodate all characters in the given ranges
stbtt_PackFontRangesGatherRects(stbtt_pack_context * spc,stbtt_fontinfo * info,stbtt_pack_range * ranges,int num_ranges,stbrp_rect * rects)2862 STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
2863 {
2864 int i,j,k;
2865
2866 k=0;
2867 for (i=0; i < num_ranges; ++i) {
2868 float fh = ranges[i].font_size;
2869 float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
2870 ranges[i].h_oversample = (unsigned char) spc->h_oversample;
2871 ranges[i].v_oversample = (unsigned char) spc->v_oversample;
2872 for (j=0; j < ranges[i].num_chars; ++j) {
2873 int x0,y0,x1,y1;
2874 int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
2875 int glyph = stbtt_FindGlyphIndex(info, codepoint);
2876 stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
2877 scale * spc->h_oversample,
2878 scale * spc->v_oversample,
2879 0,0,
2880 &x0,&y0,&x1,&y1);
2881 rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
2882 rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
2883 ++k;
2884 }
2885 }
2886
2887 return k;
2888 }
2889
2890 // rects array must be big enough to accommodate all characters in the given ranges
stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context * spc,stbtt_fontinfo * info,stbtt_pack_range * ranges,int num_ranges,stbrp_rect * rects)2891 STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
2892 {
2893 int i,j,k, return_value = 1;
2894
2895 // save current values
2896 int old_h_over = spc->h_oversample;
2897 int old_v_over = spc->v_oversample;
2898
2899 k = 0;
2900 for (i=0; i < num_ranges; ++i) {
2901 float fh = ranges[i].font_size;
2902 float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
2903 float recip_h,recip_v,sub_x,sub_y;
2904 spc->h_oversample = ranges[i].h_oversample;
2905 spc->v_oversample = ranges[i].v_oversample;
2906 recip_h = 1.0f / spc->h_oversample;
2907 recip_v = 1.0f / spc->v_oversample;
2908 sub_x = stbtt__oversample_shift(spc->h_oversample);
2909 sub_y = stbtt__oversample_shift(spc->v_oversample);
2910 for (j=0; j < ranges[i].num_chars; ++j) {
2911 stbrp_rect *r = &rects[k];
2912 if (r->was_packed) {
2913 stbtt_packedchar *bc = &ranges[i].chardata_for_range[j];
2914 int advance, lsb, x0,y0,x1,y1;
2915 int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
2916 int glyph = stbtt_FindGlyphIndex(info, codepoint);
2917 stbrp_coord pad = (stbrp_coord) spc->padding;
2918
2919 // pad on left and top
2920 r->x += pad;
2921 r->y += pad;
2922 r->w -= pad;
2923 r->h -= pad;
2924 stbtt_GetGlyphHMetrics(info, glyph, &advance, &lsb);
2925 stbtt_GetGlyphBitmapBox(info, glyph,
2926 scale * spc->h_oversample,
2927 scale * spc->v_oversample,
2928 &x0,&y0,&x1,&y1);
2929 stbtt_MakeGlyphBitmapSubpixel(info,
2930 spc->pixels + r->x + r->y*spc->stride_in_bytes,
2931 r->w - spc->h_oversample+1,
2932 r->h - spc->v_oversample+1,
2933 spc->stride_in_bytes,
2934 scale * spc->h_oversample,
2935 scale * spc->v_oversample,
2936 0,0,
2937 glyph);
2938
2939 if (spc->h_oversample > 1)
2940 stbtt__h_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
2941 r->w, r->h, spc->stride_in_bytes,
2942 spc->h_oversample);
2943
2944 if (spc->v_oversample > 1)
2945 stbtt__v_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
2946 r->w, r->h, spc->stride_in_bytes,
2947 spc->v_oversample);
2948
2949 bc->x0 = (stbtt_int16) r->x;
2950 bc->y0 = (stbtt_int16) r->y;
2951 bc->x1 = (stbtt_int16) (r->x + r->w);
2952 bc->y1 = (stbtt_int16) (r->y + r->h);
2953 bc->xadvance = scale * advance;
2954 bc->xoff = (float) x0 * recip_h + sub_x;
2955 bc->yoff = (float) y0 * recip_v + sub_y;
2956 bc->xoff2 = (x0 + r->w) * recip_h + sub_x;
2957 bc->yoff2 = (y0 + r->h) * recip_v + sub_y;
2958 } else {
2959 return_value = 0; // if any fail, report failure
2960 }
2961
2962 ++k;
2963 }
2964 }
2965
2966 // restore original values
2967 spc->h_oversample = old_h_over;
2968 spc->v_oversample = old_v_over;
2969
2970 return return_value;
2971 }
2972
stbtt_PackFontRangesPackRects(stbtt_pack_context * spc,stbrp_rect * rects,int num_rects)2973 STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects)
2974 {
2975 stbrp_pack_rects((stbrp_context *) spc->pack_info, rects, num_rects);
2976 }
2977
stbtt_PackFontRanges(stbtt_pack_context * spc,unsigned char * fontdata,int font_index,stbtt_pack_range * ranges,int num_ranges)2978 STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges)
2979 {
2980 stbtt_fontinfo info;
2981 int i,j,n, return_value = 1;
2982 //stbrp_context *context = (stbrp_context *) spc->pack_info;
2983 stbrp_rect *rects;
2984
2985 // flag all characters as NOT packed
2986 for (i=0; i < num_ranges; ++i)
2987 for (j=0; j < ranges[i].num_chars; ++j)
2988 ranges[i].chardata_for_range[j].x0 =
2989 ranges[i].chardata_for_range[j].y0 =
2990 ranges[i].chardata_for_range[j].x1 =
2991 ranges[i].chardata_for_range[j].y1 = 0;
2992
2993 n = 0;
2994 for (i=0; i < num_ranges; ++i)
2995 n += ranges[i].num_chars;
2996
2997 rects = (stbrp_rect *) STBTT_malloc(sizeof(*rects) * n, spc->user_allocator_context);
2998 if (rects == NULL)
2999 return 0;
3000
3001 info.userdata = spc->user_allocator_context;
3002 stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index));
3003
3004 n = stbtt_PackFontRangesGatherRects(spc, &info, ranges, num_ranges, rects);
3005
3006 stbtt_PackFontRangesPackRects(spc, rects, n);
3007
3008 return_value = stbtt_PackFontRangesRenderIntoRects(spc, &info, ranges, num_ranges, rects);
3009
3010 STBTT_free(rects, spc->user_allocator_context);
3011 return return_value;
3012 }
3013
stbtt_PackFontRange(stbtt_pack_context * spc,unsigned char * fontdata,int font_index,float font_size,int first_unicode_codepoint_in_range,int num_chars_in_range,stbtt_packedchar * chardata_for_range)3014 STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, float font_size,
3015 int first_unicode_codepoint_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range)
3016 {
3017 stbtt_pack_range range;
3018 range.first_unicode_codepoint_in_range = first_unicode_codepoint_in_range;
3019 range.array_of_unicode_codepoints = NULL;
3020 range.num_chars = num_chars_in_range;
3021 range.chardata_for_range = chardata_for_range;
3022 range.font_size = font_size;
3023 return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1);
3024 }
3025
stbtt_GetPackedQuad(stbtt_packedchar * chardata,int pw,int ph,int char_index,float * xpos,float * ypos,stbtt_aligned_quad * q,int align_to_integer)3026 STBTT_DEF void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer)
3027 {
3028 float ipw = 1.0f / pw, iph = 1.0f / ph;
3029 stbtt_packedchar *b = chardata + char_index;
3030
3031 if (align_to_integer) {
3032 float x = (float) STBTT_ifloor((*xpos + b->xoff) + 0.5f);
3033 float y = (float) STBTT_ifloor((*ypos + b->yoff) + 0.5f);
3034 q->x0 = x;
3035 q->y0 = y;
3036 q->x1 = x + b->xoff2 - b->xoff;
3037 q->y1 = y + b->yoff2 - b->yoff;
3038 } else {
3039 q->x0 = *xpos + b->xoff;
3040 q->y0 = *ypos + b->yoff;
3041 q->x1 = *xpos + b->xoff2;
3042 q->y1 = *ypos + b->yoff2;
3043 }
3044
3045 q->s0 = b->x0 * ipw;
3046 q->t0 = b->y0 * iph;
3047 q->s1 = b->x1 * ipw;
3048 q->t1 = b->y1 * iph;
3049
3050 *xpos += b->xadvance;
3051 }
3052
3053
3054 //////////////////////////////////////////////////////////////////////////////
3055 //
3056 // font name matching -- recommended not to use this
3057 //
3058
3059 // check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string
stbtt__CompareUTF8toUTF16_bigendian_prefix(const stbtt_uint8 * s1,stbtt_int32 len1,const stbtt_uint8 * s2,stbtt_int32 len2)3060 static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(const stbtt_uint8 *s1, stbtt_int32 len1, const stbtt_uint8 *s2, stbtt_int32 len2)
3061 {
3062 stbtt_int32 i=0;
3063
3064 // convert utf16 to utf8 and compare the results while converting
3065 while (len2) {
3066 stbtt_uint16 ch = s2[0]*256 + s2[1];
3067 if (ch < 0x80) {
3068 if (i >= len1) return -1;
3069 if (s1[i++] != ch) return -1;
3070 } else if (ch < 0x800) {
3071 if (i+1 >= len1) return -1;
3072 if (s1[i++] != 0xc0 + (ch >> 6)) return -1;
3073 if (s1[i++] != 0x80 + (ch & 0x3f)) return -1;
3074 } else if (ch >= 0xd800 && ch < 0xdc00) {
3075 stbtt_uint32 c;
3076 stbtt_uint16 ch2 = s2[2]*256 + s2[3];
3077 if (i+3 >= len1) return -1;
3078 c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000;
3079 if (s1[i++] != 0xf0 + (c >> 18)) return -1;
3080 if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1;
3081 if (s1[i++] != 0x80 + ((c >> 6) & 0x3f)) return -1;
3082 if (s1[i++] != 0x80 + ((c ) & 0x3f)) return -1;
3083 s2 += 2; // plus another 2 below
3084 len2 -= 2;
3085 } else if (ch >= 0xdc00 && ch < 0xe000) {
3086 return -1;
3087 } else {
3088 if (i+2 >= len1) return -1;
3089 if (s1[i++] != 0xe0 + (ch >> 12)) return -1;
3090 if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1;
3091 if (s1[i++] != 0x80 + ((ch ) & 0x3f)) return -1;
3092 }
3093 s2 += 2;
3094 len2 -= 2;
3095 }
3096 return i;
3097 }
3098
stbtt_CompareUTF8toUTF16_bigendian(const char * s1,int len1,const char * s2,int len2)3099 STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2)
3100 {
3101 return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((const stbtt_uint8*) s1, len1, (const stbtt_uint8*) s2, len2);
3102 }
3103
3104 // returns results in whatever encoding you request... but note that 2-byte encodings
3105 // will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare
stbtt_GetFontNameString(const stbtt_fontinfo * font,int * length,int platformID,int encodingID,int languageID,int nameID)3106 STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID)
3107 {
3108 stbtt_int32 i,count,stringOffset;
3109 stbtt_uint8 *fc = font->data;
3110 stbtt_uint32 offset = font->fontstart;
3111 stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
3112 if (!nm) return NULL;
3113
3114 count = ttUSHORT(fc+nm+2);
3115 stringOffset = nm + ttUSHORT(fc+nm+4);
3116 for (i=0; i < count; ++i) {
3117 stbtt_uint32 loc = nm + 6 + 12 * i;
3118 if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2)
3119 && languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) {
3120 *length = ttUSHORT(fc+loc+8);
3121 return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
3122 }
3123 }
3124 return NULL;
3125 }
3126
stbtt__matchpair(stbtt_uint8 * fc,stbtt_uint32 nm,stbtt_uint8 * name,stbtt_int32 nlen,stbtt_int32 target_id,stbtt_int32 next_id)3127 static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
3128 {
3129 stbtt_int32 i;
3130 stbtt_int32 count = ttUSHORT(fc+nm+2);
3131 stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4);
3132
3133 for (i=0; i < count; ++i) {
3134 stbtt_uint32 loc = nm + 6 + 12 * i;
3135 stbtt_int32 id = ttUSHORT(fc+loc+6);
3136 if (id == target_id) {
3137 // find the encoding
3138 stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4);
3139
3140 // is this a Unicode encoding?
3141 if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
3142 stbtt_int32 slen = ttUSHORT(fc+loc+8);
3143 stbtt_int32 off = ttUSHORT(fc+loc+10);
3144
3145 // check if there's a prefix match
3146 stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
3147 if (matchlen >= 0) {
3148 // check for target_id+1 immediately following, with same encoding & language
3149 if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
3150 slen = ttUSHORT(fc+loc+12+8);
3151 off = ttUSHORT(fc+loc+12+10);
3152 if (slen == 0) {
3153 if (matchlen == nlen)
3154 return 1;
3155 } else if (matchlen < nlen && name[matchlen] == ' ') {
3156 ++matchlen;
3157 if (stbtt_CompareUTF8toUTF16_bigendian((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen))
3158 return 1;
3159 }
3160 } else {
3161 // if nothing immediately following
3162 if (matchlen == nlen)
3163 return 1;
3164 }
3165 }
3166 }
3167
3168 // @TODO handle other encodings
3169 }
3170 }
3171 return 0;
3172 }
3173
stbtt__matches(stbtt_uint8 * fc,stbtt_uint32 offset,stbtt_uint8 * name,stbtt_int32 flags)3174 static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags)
3175 {
3176 stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name);
3177 stbtt_uint32 nm,hd;
3178 if (!stbtt__isfont(fc+offset)) return 0;
3179
3180 // check italics/bold/underline flags in macStyle...
3181 if (flags) {
3182 hd = stbtt__find_table(fc, offset, "head");
3183 if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0;
3184 }
3185
3186 nm = stbtt__find_table(fc, offset, "name");
3187 if (!nm) return 0;
3188
3189 if (flags) {
3190 // if we checked the macStyle flags, then just check the family and ignore the subfamily
3191 if (stbtt__matchpair(fc, nm, name, nlen, 16, -1)) return 1;
3192 if (stbtt__matchpair(fc, nm, name, nlen, 1, -1)) return 1;
3193 if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
3194 } else {
3195 if (stbtt__matchpair(fc, nm, name, nlen, 16, 17)) return 1;
3196 if (stbtt__matchpair(fc, nm, name, nlen, 1, 2)) return 1;
3197 if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
3198 }
3199
3200 return 0;
3201 }
3202
stbtt_FindMatchingFont(const unsigned char * font_collection,const char * name_utf8,stbtt_int32 flags)3203 STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *font_collection, const char *name_utf8, stbtt_int32 flags)
3204 {
3205 stbtt_int32 i;
3206 for (i=0;;++i) {
3207 stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i);
3208 if (off < 0) return off;
3209 if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags))
3210 return off;
3211 }
3212 }
3213
3214 #endif // STB_TRUETYPE_IMPLEMENTATION
3215
3216
3217 // FULL VERSION HISTORY
3218 //
3219 // 1.10 (2016-04-02) allow user-defined fabs() replacement
3220 // fix memory leak if fontsize=0.0
3221 // fix warning from duplicate typedef
3222 // 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use alloc userdata for PackFontRanges
3223 // 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
3224 // 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
3225 // allow PackFontRanges to pack and render in separate phases;
3226 // fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
3227 // fixed an assert() bug in the new rasterizer
3228 // replace assert() with STBTT_assert() in new rasterizer
3229 // 1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine)
3230 // also more precise AA rasterizer, except if shapes overlap
3231 // remove need for STBTT_sort
3232 // 1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC
3233 // 1.04 (2015-04-15) typo in example
3234 // 1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes
3235 // 1.02 (2014-12-10) fix various warnings & compile issues w/ stb_rect_pack, C++
3236 // 1.01 (2014-12-08) fix subpixel position when oversampling to exactly match
3237 // non-oversampled; STBTT_POINT_SIZE for packed case only
3238 // 1.00 (2014-12-06) add new PackBegin etc. API, w/ support for oversampling
3239 // 0.99 (2014-09-18) fix multiple bugs with subpixel rendering (ryg)
3240 // 0.9 (2014-08-07) support certain mac/iOS fonts without an MS platformID
3241 // 0.8b (2014-07-07) fix a warning
3242 // 0.8 (2014-05-25) fix a few more warnings
3243 // 0.7 (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back
3244 // 0.6c (2012-07-24) improve documentation
3245 // 0.6b (2012-07-20) fix a few more warnings
3246 // 0.6 (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
3247 // stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty
3248 // 0.5 (2011-12-09) bugfixes:
3249 // subpixel glyph renderer computed wrong bounding box
3250 // first vertex of shape can be off-curve (FreeSans)
3251 // 0.4b (2011-12-03) fixed an error in the font baking example
3252 // 0.4 (2011-12-01) kerning, subpixel rendering (tor)
3253 // bugfixes for:
3254 // codepoint-to-glyph conversion using table fmt=12
3255 // codepoint-to-glyph conversion using table fmt=4
3256 // stbtt_GetBakedQuad with non-square texture (Zer)
3257 // updated Hello World! sample to use kerning and subpixel
3258 // fixed some warnings
3259 // 0.3 (2009-06-24) cmap fmt=12, compound shapes (MM)
3260 // userdata, malloc-from-userdata, non-zero fill (stb)
3261 // 0.2 (2009-03-11) Fix unsigned/signed char warnings
3262 // 0.1 (2009-03-09) First public release
3263 //
3264