1 | // stb_truetype.h - v1.26 - public domain |
2 | // authored from 2009-2021 by Sean Barrett / RAD Game Tools |
3 | // |
4 | // ======================================================================= |
5 | // |
6 | // NO SECURITY GUARANTEE -- DO NOT USE THIS ON UNTRUSTED FONT FILES |
7 | // |
8 | // This library does no range checking of the offsets found in the file, |
9 | // meaning an attacker can use it to read arbitrary memory. |
10 | // |
11 | // ======================================================================= |
12 | // |
13 | // This library processes TrueType files: |
14 | // parse files |
15 | // extract glyph metrics |
16 | // extract glyph shapes |
17 | // render glyphs to one-channel bitmaps with antialiasing (box filter) |
18 | // render glyphs to one-channel SDF bitmaps (signed-distance field/function) |
19 | // |
20 | // Todo: |
21 | // non-MS cmaps |
22 | // crashproof on bad data |
23 | // hinting? (no longer patented) |
24 | // cleartype-style AA? |
25 | // optimize: use simple memory allocator for intermediates |
26 | // optimize: build edge-list directly from curves |
27 | // optimize: rasterize directly from curves? |
28 | // |
29 | // ADDITIONAL CONTRIBUTORS |
30 | // |
31 | // Mikko Mononen: compound shape support, more cmap formats |
32 | // Tor Andersson: kerning, subpixel rendering |
33 | // Dougall Johnson: OpenType / Type 2 font handling |
34 | // Daniel Ribeiro Maciel: basic GPOS-based kerning |
35 | // |
36 | // Misc other: |
37 | // Ryan Gordon |
38 | // Simon Glass |
39 | // github:IntellectualKitty |
40 | // Imanol Celaya |
41 | // Daniel Ribeiro Maciel |
42 | // |
43 | // Bug/warning reports/fixes: |
44 | // "Zer" on mollyrocket Fabian "ryg" Giesen github:NiLuJe |
45 | // Cass Everitt Martins Mozeiko github:aloucks |
46 | // stoiko (Haemimont Games) Cap Petschulat github:oyvindjam |
47 | // Brian Hook Omar Cornut github:vassvik |
48 | // Walter van Niftrik Ryan Griege |
49 | // David Gow Peter LaValle |
50 | // David Given Sergey Popov |
51 | // Ivan-Assen Ivanov Giumo X. Clanjor |
52 | // Anthony Pesch Higor Euripedes |
53 | // Johan Duparc Thomas Fields |
54 | // Hou Qiming Derek Vinyard |
55 | // Rob Loach Cort Stratton |
56 | // Kenney Phillis Jr. Brian Costabile |
57 | // Ken Voskuil (kaesve) |
58 | // |
59 | // VERSION HISTORY |
60 | // |
61 | // 1.26 (2021-08-28) fix broken rasterizer |
62 | // 1.25 (2021-07-11) many fixes |
63 | // 1.24 (2020-02-05) fix warning |
64 | // 1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS) |
65 | // 1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined |
66 | // 1.21 (2019-02-25) fix warning |
67 | // 1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics() |
68 | // 1.19 (2018-02-11) GPOS kerning, STBTT_fmod |
69 | // 1.18 (2018-01-29) add missing function |
70 | // 1.17 (2017-07-23) make more arguments const; doc fix |
71 | // 1.16 (2017-07-12) SDF support |
72 | // 1.15 (2017-03-03) make more arguments const |
73 | // 1.14 (2017-01-16) num-fonts-in-TTC function |
74 | // 1.13 (2017-01-02) support OpenType fonts, certain Apple fonts |
75 | // 1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual |
76 | // 1.11 (2016-04-02) fix unused-variable warning |
77 | // 1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef |
78 | // 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly |
79 | // 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges |
80 | // 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints; |
81 | // variant PackFontRanges to pack and render in separate phases; |
82 | // fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?); |
83 | // fixed an assert() bug in the new rasterizer |
84 | // replace assert() with STBTT_assert() in new rasterizer |
85 | // |
86 | // Full history can be found at the end of this file. |
87 | // |
88 | // LICENSE |
89 | // |
90 | // See end of file for license information. |
91 | // |
92 | // USAGE |
93 | // |
94 | // Include this file in whatever places need to refer to it. In ONE C/C++ |
95 | // file, write: |
96 | // #define STB_TRUETYPE_IMPLEMENTATION |
97 | // before the #include of this file. This expands out the actual |
98 | // implementation into that C/C++ file. |
99 | // |
100 | // To make the implementation private to the file that generates the implementation, |
101 | // #define STBTT_STATIC |
102 | // |
103 | // Simple 3D API (don't ship this, but it's fine for tools and quick start) |
104 | // stbtt_BakeFontBitmap() -- bake a font to a bitmap for use as texture |
105 | // stbtt_GetBakedQuad() -- compute quad to draw for a given char |
106 | // |
107 | // Improved 3D API (more shippable): |
108 | // #include "stb_rect_pack.h" -- optional, but you really want it |
109 | // stbtt_PackBegin() |
110 | // stbtt_PackSetOversampling() -- for improved quality on small fonts |
111 | // stbtt_PackFontRanges() -- pack and renders |
112 | // stbtt_PackEnd() |
113 | // stbtt_GetPackedQuad() |
114 | // |
115 | // "Load" a font file from a memory buffer (you have to keep the buffer loaded) |
116 | // stbtt_InitFont() |
117 | // stbtt_GetFontOffsetForIndex() -- indexing for TTC font collections |
118 | // stbtt_GetNumberOfFonts() -- number of fonts for TTC font collections |
119 | // |
120 | // Render a unicode codepoint to a bitmap |
121 | // stbtt_GetCodepointBitmap() -- allocates and returns a bitmap |
122 | // stbtt_MakeCodepointBitmap() -- renders into bitmap you provide |
123 | // stbtt_GetCodepointBitmapBox() -- how big the bitmap must be |
124 | // |
125 | // Character advance/positioning |
126 | // stbtt_GetCodepointHMetrics() |
127 | // stbtt_GetFontVMetrics() |
128 | // stbtt_GetFontVMetricsOS2() |
129 | // stbtt_GetCodepointKernAdvance() |
130 | // |
131 | // Starting with version 1.06, the rasterizer was replaced with a new, |
132 | // faster and generally-more-precise rasterizer. The new rasterizer more |
133 | // accurately measures pixel coverage for anti-aliasing, except in the case |
134 | // where multiple shapes overlap, in which case it overestimates the AA pixel |
135 | // coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If |
136 | // this turns out to be a problem, you can re-enable the old rasterizer with |
137 | // #define STBTT_RASTERIZER_VERSION 1 |
138 | // which will incur about a 15% speed hit. |
139 | // |
140 | // ADDITIONAL DOCUMENTATION |
141 | // |
142 | // Immediately after this block comment are a series of sample programs. |
143 | // |
144 | // After the sample programs is the "header file" section. This section |
145 | // includes documentation for each API function. |
146 | // |
147 | // Some important concepts to understand to use this library: |
148 | // |
149 | // Codepoint |
150 | // Characters are defined by unicode codepoints, e.g. 65 is |
151 | // uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is |
152 | // the hiragana for "ma". |
153 | // |
154 | // Glyph |
155 | // A visual character shape (every codepoint is rendered as |
156 | // some glyph) |
157 | // |
158 | // Glyph index |
159 | // A font-specific integer ID representing a glyph |
160 | // |
161 | // Baseline |
162 | // Glyph shapes are defined relative to a baseline, which is the |
163 | // bottom of uppercase characters. Characters extend both above |
164 | // and below the baseline. |
165 | // |
166 | // Current Point |
167 | // As you draw text to the screen, you keep track of a "current point" |
168 | // which is the origin of each character. The current point's vertical |
169 | // position is the baseline. Even "baked fonts" use this model. |
170 | // |
171 | // Vertical Font Metrics |
172 | // The vertical qualities of the font, used to vertically position |
173 | // and space the characters. See docs for stbtt_GetFontVMetrics. |
174 | // |
175 | // Font Size in Pixels or Points |
176 | // The preferred interface for specifying font sizes in stb_truetype |
177 | // is to specify how tall the font's vertical extent should be in pixels. |
178 | // If that sounds good enough, skip the next paragraph. |
179 | // |
180 | // Most font APIs instead use "points", which are a common typographic |
181 | // measurement for describing font size, defined as 72 points per inch. |
182 | // stb_truetype provides a point API for compatibility. However, true |
183 | // "per inch" conventions don't make much sense on computer displays |
184 | // since different monitors have different number of pixels per |
185 | // inch. For example, Windows traditionally uses a convention that |
186 | // there are 96 pixels per inch, thus making 'inch' measurements have |
187 | // nothing to do with inches, and thus effectively defining a point to |
188 | // be 1.333 pixels. Additionally, the TrueType font data provides |
189 | // an explicit scale factor to scale a given font's glyphs to points, |
190 | // but the author has observed that this scale factor is often wrong |
191 | // for non-commercial fonts, thus making fonts scaled in points |
192 | // according to the TrueType spec incoherently sized in practice. |
193 | // |
194 | // DETAILED USAGE: |
195 | // |
196 | // Scale: |
197 | // Select how high you want the font to be, in points or pixels. |
198 | // Call ScaleForPixelHeight or ScaleForMappingEmToPixels to compute |
199 | // a scale factor SF that will be used by all other functions. |
200 | // |
201 | // Baseline: |
202 | // You need to select a y-coordinate that is the baseline of where |
203 | // your text will appear. Call GetFontBoundingBox to get the baseline-relative |
204 | // bounding box for all characters. SF*-y0 will be the distance in pixels |
205 | // that the worst-case character could extend above the baseline, so if |
206 | // you want the top edge of characters to appear at the top of the |
207 | // screen where y=0, then you would set the baseline to SF*-y0. |
208 | // |
209 | // Current point: |
210 | // Set the current point where the first character will appear. The |
211 | // first character could extend left of the current point; this is font |
212 | // dependent. You can either choose a current point that is the leftmost |
213 | // point and hope, or add some padding, or check the bounding box or |
214 | // left-side-bearing of the first character to be displayed and set |
215 | // the current point based on that. |
216 | // |
217 | // Displaying a character: |
218 | // Compute the bounding box of the character. It will contain signed values |
219 | // relative to <current_point, baseline>. I.e. if it returns x0,y0,x1,y1, |
220 | // then the character should be displayed in the rectangle from |
221 | // <current_point+SF*x0, baseline+SF*y0> to <current_point+SF*x1,baseline+SF*y1). |
222 | // |
223 | // Advancing for the next character: |
224 | // Call GlyphHMetrics, and compute 'current_point += SF * advance'. |
225 | // |
226 | // |
227 | // ADVANCED USAGE |
228 | // |
229 | // Quality: |
230 | // |
231 | // - Use the functions with Subpixel at the end to allow your characters |
232 | // to have subpixel positioning. Since the font is anti-aliased, not |
233 | // hinted, this is very import for quality. (This is not possible with |
234 | // baked fonts.) |
235 | // |
236 | // - Kerning is now supported, and if you're supporting subpixel rendering |
237 | // then kerning is worth using to give your text a polished look. |
238 | // |
239 | // Performance: |
240 | // |
241 | // - Convert Unicode codepoints to glyph indexes and operate on the glyphs; |
242 | // if you don't do this, stb_truetype is forced to do the conversion on |
243 | // every call. |
244 | // |
245 | // - There are a lot of memory allocations. We should modify it to take |
246 | // a temp buffer and allocate from the temp buffer (without freeing), |
247 | // should help performance a lot. |
248 | // |
249 | // NOTES |
250 | // |
251 | // The system uses the raw data found in the .ttf file without changing it |
252 | // and without building auxiliary data structures. This is a bit inefficient |
253 | // on little-endian systems (the data is big-endian), but assuming you're |
254 | // caching the bitmaps or glyph shapes this shouldn't be a big deal. |
255 | // |
256 | // It appears to be very hard to programmatically determine what font a |
257 | // given file is in a general way. I provide an API for this, but I don't |
258 | // recommend it. |
259 | // |
260 | // |
261 | // PERFORMANCE MEASUREMENTS FOR 1.06: |
262 | // |
263 | // 32-bit 64-bit |
264 | // Previous release: 8.83 s 7.68 s |
265 | // Pool allocations: 7.72 s 6.34 s |
266 | // Inline sort : 6.54 s 5.65 s |
267 | // New rasterizer : 5.63 s 5.00 s |
268 | |
269 | ////////////////////////////////////////////////////////////////////////////// |
270 | ////////////////////////////////////////////////////////////////////////////// |
271 | //// |
272 | //// SAMPLE PROGRAMS |
273 | //// |
274 | // |
275 | // Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless. |
276 | // See "tests/truetype_demo_win32.c" for a complete version. |
277 | #if 0 |
278 | #define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation |
279 | #include "stb_truetype.h" |
280 | |
281 | unsigned char ttf_buffer[1<<20]; |
282 | unsigned char temp_bitmap[512*512]; |
283 | |
284 | stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs |
285 | GLuint ftex; |
286 | |
287 | void my_stbtt_initfont(void) |
288 | { |
289 | fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb")); |
290 | stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits! |
291 | // can free ttf_buffer at this point |
292 | glGenTextures(1, &ftex); |
293 | glBindTexture(GL_TEXTURE_2D, ftex); |
294 | glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap); |
295 | // can free temp_bitmap at this point |
296 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
297 | } |
298 | |
299 | void my_stbtt_print(float x, float y, char *text) |
300 | { |
301 | // assume orthographic projection with units = screen pixels, origin at top left |
302 | glEnable(GL_BLEND); |
303 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
304 | glEnable(GL_TEXTURE_2D); |
305 | glBindTexture(GL_TEXTURE_2D, ftex); |
306 | glBegin(GL_QUADS); |
307 | while (*text) { |
308 | if (*text >= 32 && *text < 128) { |
309 | stbtt_aligned_quad q; |
310 | stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9 |
311 | glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y0); |
312 | glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y0); |
313 | glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y1); |
314 | glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y1); |
315 | } |
316 | ++text; |
317 | } |
318 | glEnd(); |
319 | } |
320 | #endif |
321 | // |
322 | // |
323 | ////////////////////////////////////////////////////////////////////////////// |
324 | // |
325 | // Complete program (this compiles): get a single bitmap, print as ASCII art |
326 | // |
327 | #if 0 |
328 | #include <stdio.h> |
329 | #define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation |
330 | #include "stb_truetype.h" |
331 | |
332 | char ttf_buffer[1<<25]; |
333 | |
334 | int main(int argc, char **argv) |
335 | { |
336 | stbtt_fontinfo font; |
337 | unsigned char *bitmap; |
338 | int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20); |
339 | |
340 | fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb")); |
341 | |
342 | stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0)); |
343 | bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0); |
344 | |
345 | for (j=0; j < h; ++j) { |
346 | for (i=0; i < w; ++i) |
347 | putchar(" .:ioVM@"[bitmap[j*w+i]>>5]); |
348 | putchar('\n'); |
349 | } |
350 | return 0; |
351 | } |
352 | #endif |
353 | // |
354 | // Output: |
355 | // |
356 | // .ii. |
357 | // @@@@@@. |
358 | // V@Mio@@o |
359 | // :i. V@V |
360 | // :oM@@M |
361 | // :@@@MM@M |
362 | // @@o o@M |
363 | // :@@. M@M |
364 | // @@@o@@@@ |
365 | // :M@@V:@@. |
366 | // |
367 | ////////////////////////////////////////////////////////////////////////////// |
368 | // |
369 | // Complete program: print "Hello World!" banner, with bugs |
370 | // |
371 | #if 0 |
372 | char buffer[24<<20]; |
373 | unsigned char screen[20][79]; |
374 | |
375 | int main(int arg, char **argv) |
376 | { |
377 | stbtt_fontinfo font; |
378 | int i,j,ascent,baseline,ch=0; |
379 | float scale, xpos=2; // leave a little padding in case the character extends left |
380 | char *text = "Heljo World!"; // intentionally misspelled to show 'lj' brokenness |
381 | |
382 | fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb")); |
383 | stbtt_InitFont(&font, buffer, 0); |
384 | |
385 | scale = stbtt_ScaleForPixelHeight(&font, 15); |
386 | stbtt_GetFontVMetrics(&font, &ascent,0,0); |
387 | baseline = (int) (ascent*scale); |
388 | |
389 | while (text[ch]) { |
390 | int advance,lsb,x0,y0,x1,y1; |
391 | float x_shift = xpos - (float) floor(xpos); |
392 | stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb); |
393 | stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1); |
394 | stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]); |
395 | // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong |
396 | // because this API is really for baking character bitmaps into textures. if you want to render |
397 | // a sequence of characters, you really need to render each bitmap to a temp buffer, then |
398 | // "alpha blend" that into the working buffer |
399 | xpos += (advance * scale); |
400 | if (text[ch+1]) |
401 | xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]); |
402 | ++ch; |
403 | } |
404 | |
405 | for (j=0; j < 20; ++j) { |
406 | for (i=0; i < 78; ++i) |
407 | putchar(" .:ioVM@"[screen[j][i]>>5]); |
408 | putchar('\n'); |
409 | } |
410 | |
411 | return 0; |
412 | } |
413 | #endif |
414 | |
415 | |
416 | ////////////////////////////////////////////////////////////////////////////// |
417 | ////////////////////////////////////////////////////////////////////////////// |
418 | //// |
419 | //// INTEGRATION WITH YOUR CODEBASE |
420 | //// |
421 | //// The following sections allow you to supply alternate definitions |
422 | //// of C library functions used by stb_truetype, e.g. if you don't |
423 | //// link with the C runtime library. |
424 | |
425 | #ifdef STB_TRUETYPE_IMPLEMENTATION |
426 | // #define your own (u)stbtt_int8/16/32 before including to override this |
427 | #ifndef stbtt_uint8 |
428 | typedef unsigned char stbtt_uint8; |
429 | typedef signed char stbtt_int8; |
430 | typedef unsigned short stbtt_uint16; |
431 | typedef signed short stbtt_int16; |
432 | typedef unsigned int stbtt_uint32; |
433 | typedef signed int stbtt_int32; |
434 | #endif |
435 | |
436 | typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1]; |
437 | typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1]; |
438 | |
439 | // e.g. #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h |
440 | #ifndef STBTT_ifloor |
441 | #include <math.h> |
442 | #define STBTT_ifloor(x) ((int) floor(x)) |
443 | #define STBTT_iceil(x) ((int) ceil(x)) |
444 | #endif |
445 | |
446 | #ifndef STBTT_sqrt |
447 | #include <math.h> |
448 | #define STBTT_sqrt(x) sqrt(x) |
449 | #define STBTT_pow(x,y) pow(x,y) |
450 | #endif |
451 | |
452 | #ifndef STBTT_fmod |
453 | #include <math.h> |
454 | #define STBTT_fmod(x,y) fmod(x,y) |
455 | #endif |
456 | |
457 | #ifndef STBTT_cos |
458 | #include <math.h> |
459 | #define STBTT_cos(x) cos(x) |
460 | #define STBTT_acos(x) acos(x) |
461 | #endif |
462 | |
463 | #ifndef STBTT_fabs |
464 | #include <math.h> |
465 | #define STBTT_fabs(x) fabs(x) |
466 | #endif |
467 | |
468 | // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h |
469 | #ifndef STBTT_malloc |
470 | #include <stdlib.h> |
471 | #define STBTT_malloc(x,u) ((void)(u),FONTSTASH_MALLOC(x)) |
472 | #define STBTT_free(x,u) ((void)(u),FONTSTASH_FREE(x)) |
473 | #endif |
474 | |
475 | #ifndef STBTT_assert |
476 | #include <assert.h> |
477 | #define STBTT_assert(x) assert(x) |
478 | #endif |
479 | |
480 | #ifndef STBTT_strlen |
481 | #include <string.h> |
482 | #define STBTT_strlen(x) strlen(x) |
483 | #endif |
484 | |
485 | #ifndef STBTT_memcpy |
486 | #include <string.h> |
487 | #define STBTT_memcpy memcpy |
488 | #define STBTT_memset memset |
489 | #endif |
490 | #endif |
491 | |
492 | /////////////////////////////////////////////////////////////////////////////// |
493 | /////////////////////////////////////////////////////////////////////////////// |
494 | //// |
495 | //// INTERFACE |
496 | //// |
497 | //// |
498 | |
499 | #ifndef __STB_INCLUDE_STB_TRUETYPE_H__ |
500 | #define __STB_INCLUDE_STB_TRUETYPE_H__ |
501 | |
502 | #ifdef STBTT_STATIC |
503 | #define STBTT_DEF static |
504 | #else |
505 | #define STBTT_DEF extern |
506 | #endif |
507 | |
508 | #ifdef __cplusplus |
509 | extern "C" { |
510 | #endif |
511 | |
512 | // private structure |
513 | typedef struct |
514 | { |
515 | unsigned char *data; |
516 | int cursor; |
517 | int size; |
518 | } stbtt__buf; |
519 | |
520 | ////////////////////////////////////////////////////////////////////////////// |
521 | // |
522 | // TEXTURE BAKING API |
523 | // |
524 | // If you use this API, you only have to call two functions ever. |
525 | // |
526 | |
527 | typedef struct |
528 | { |
529 | unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap |
530 | float xoff,yoff,xadvance; |
531 | } stbtt_bakedchar; |
532 | |
533 | STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf) |
534 | float pixel_height, // height of font in pixels |
535 | unsigned char *pixels, int pw, int ph, // bitmap to be filled in |
536 | int first_char, int num_chars, // characters to bake |
537 | stbtt_bakedchar *chardata); // you allocate this, it's num_chars long |
538 | // if return is positive, the first unused row of the bitmap |
539 | // if return is negative, returns the negative of the number of characters that fit |
540 | // if return is 0, no characters fit and no rows were used |
541 | // This uses a very crappy packing. |
542 | |
543 | typedef struct |
544 | { |
545 | float x0,y0,s0,t0; // top-left |
546 | float x1,y1,s1,t1; // bottom-right |
547 | } stbtt_aligned_quad; |
548 | |
549 | STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, // same data as above |
550 | int char_index, // character to display |
551 | float *xpos, float *ypos, // pointers to current position in screen pixel space |
552 | stbtt_aligned_quad *q, // output: quad to draw |
553 | int opengl_fillrule); // true if opengl fill rule; false if DX9 or earlier |
554 | // Call GetBakedQuad with char_index = 'character - first_char', and it |
555 | // creates the quad you need to draw and advances the current position. |
556 | // |
557 | // The coordinate system used assumes y increases downwards. |
558 | // |
559 | // Characters will extend both above and below the current position; |
560 | // see discussion of "BASELINE" above. |
561 | // |
562 | // It's inefficient; you might want to c&p it and optimize it. |
563 | |
564 | STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap); |
565 | // Query the font vertical metrics without having to create a font first. |
566 | |
567 | |
568 | ////////////////////////////////////////////////////////////////////////////// |
569 | // |
570 | // NEW TEXTURE BAKING API |
571 | // |
572 | // This provides options for packing multiple fonts into one atlas, not |
573 | // perfectly but better than nothing. |
574 | |
575 | typedef struct |
576 | { |
577 | unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap |
578 | float xoff,yoff,xadvance; |
579 | float xoff2,yoff2; |
580 | } stbtt_packedchar; |
581 | |
582 | typedef struct stbtt_pack_context stbtt_pack_context; |
583 | typedef struct stbtt_fontinfo stbtt_fontinfo; |
584 | #ifndef STB_RECT_PACK_VERSION |
585 | typedef struct stbrp_rect stbrp_rect; |
586 | #endif |
587 | |
588 | 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); |
589 | // Initializes a packing context stored in the passed-in stbtt_pack_context. |
590 | // Future calls using this context will pack characters into the bitmap passed |
591 | // in here: a 1-channel bitmap that is width * height. stride_in_bytes is |
592 | // the distance from one row to the next (or 0 to mean they are packed tightly |
593 | // together). "padding" is the amount of padding to leave between each |
594 | // character (normally you want '1' for bitmaps you'll use as textures with |
595 | // bilinear filtering). |
596 | // |
597 | // Returns 0 on failure, 1 on success. |
598 | |
599 | STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc); |
600 | // Cleans up the packing context and frees all memory. |
601 | |
602 | #define STBTT_POINT_SIZE(x) (-(x)) |
603 | |
604 | STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size, |
605 | int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range); |
606 | // Creates character bitmaps from the font_index'th font found in fontdata (use |
607 | // font_index=0 if you don't know what that is). It creates num_chars_in_range |
608 | // bitmaps for characters with unicode values starting at first_unicode_char_in_range |
609 | // and increasing. Data for how to render them is stored in chardata_for_range; |
610 | // pass these to stbtt_GetPackedQuad to get back renderable quads. |
611 | // |
612 | // font_size is the full height of the character from ascender to descender, |
613 | // as computed by stbtt_ScaleForPixelHeight. To use a point size as computed |
614 | // by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE() |
615 | // and pass that result as 'font_size': |
616 | // ..., 20 , ... // font max minus min y is 20 pixels tall |
617 | // ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall |
618 | |
619 | typedef struct |
620 | { |
621 | float font_size; |
622 | int first_unicode_codepoint_in_range; // if non-zero, then the chars are continuous, and this is the first codepoint |
623 | int *array_of_unicode_codepoints; // if non-zero, then this is an array of unicode codepoints |
624 | int num_chars; |
625 | stbtt_packedchar *chardata_for_range; // output |
626 | unsigned char h_oversample, v_oversample; // don't set these, they're used internally |
627 | } stbtt_pack_range; |
628 | |
629 | STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges); |
630 | // Creates character bitmaps from multiple ranges of characters stored in |
631 | // ranges. This will usually create a better-packed bitmap than multiple |
632 | // calls to stbtt_PackFontRange. Note that you can call this multiple |
633 | // times within a single PackBegin/PackEnd. |
634 | |
635 | STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample); |
636 | // Oversampling a font increases the quality by allowing higher-quality subpixel |
637 | // positioning, and is especially valuable at smaller text sizes. |
638 | // |
639 | // This function sets the amount of oversampling for all following calls to |
640 | // stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given |
641 | // pack context. The default (no oversampling) is achieved by h_oversample=1 |
642 | // and v_oversample=1. The total number of pixels required is |
643 | // h_oversample*v_oversample larger than the default; for example, 2x2 |
644 | // oversampling requires 4x the storage of 1x1. For best results, render |
645 | // oversampled textures with bilinear filtering. Look at the readme in |
646 | // stb/tests/oversample for information about oversampled fonts |
647 | // |
648 | // To use with PackFontRangesGather etc., you must set it before calls |
649 | // call to PackFontRangesGatherRects. |
650 | |
651 | STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip); |
652 | // If skip != 0, this tells stb_truetype to skip any codepoints for which |
653 | // there is no corresponding glyph. If skip=0, which is the default, then |
654 | // codepoints without a glyph recived the font's "missing character" glyph, |
655 | // typically an empty box by convention. |
656 | |
657 | STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, // same data as above |
658 | int char_index, // character to display |
659 | float *xpos, float *ypos, // pointers to current position in screen pixel space |
660 | stbtt_aligned_quad *q, // output: quad to draw |
661 | int align_to_integer); |
662 | |
663 | STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects); |
664 | STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects); |
665 | STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects); |
666 | // Calling these functions in sequence is roughly equivalent to calling |
667 | // stbtt_PackFontRanges(). If you more control over the packing of multiple |
668 | // fonts, or if you want to pack custom data into a font texture, take a look |
669 | // at the source to of stbtt_PackFontRanges() and create a custom version |
670 | // using these functions, e.g. call GatherRects multiple times, |
671 | // building up a single array of rects, then call PackRects once, |
672 | // then call RenderIntoRects repeatedly. This may result in a |
673 | // better packing than calling PackFontRanges multiple times |
674 | // (or it may not). |
675 | |
676 | // this is an opaque structure that you shouldn't mess with which holds |
677 | // all the context needed from PackBegin to PackEnd. |
678 | struct stbtt_pack_context { |
679 | void *user_allocator_context; |
680 | void *pack_info; |
681 | int width; |
682 | int height; |
683 | int stride_in_bytes; |
684 | int padding; |
685 | int skip_missing; |
686 | unsigned int h_oversample, v_oversample; |
687 | unsigned char *pixels; |
688 | void *nodes; |
689 | }; |
690 | |
691 | ////////////////////////////////////////////////////////////////////////////// |
692 | // |
693 | // FONT LOADING |
694 | // |
695 | // |
696 | |
697 | STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data); |
698 | // This function will determine the number of fonts in a font file. TrueType |
699 | // collection (.ttc) files may contain multiple fonts, while TrueType font |
700 | // (.ttf) files only contain one font. The number of fonts can be used for |
701 | // indexing with the previous function where the index is between zero and one |
702 | // less than the total fonts. If an error occurs, -1 is returned. |
703 | |
704 | STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index); |
705 | // Each .ttf/.ttc file may have more than one font. Each font has a sequential |
706 | // index number starting from 0. Call this function to get the font offset for |
707 | // a given index; it returns -1 if the index is out of range. A regular .ttf |
708 | // file will only define one font and it always be at offset 0, so it will |
709 | // return '0' for index 0, and -1 for all other indices. |
710 | |
711 | // The following structure is defined publicly so you can declare one on |
712 | // the stack or as a global or etc, but you should treat it as opaque. |
713 | struct stbtt_fontinfo |
714 | { |
715 | void * userdata; |
716 | unsigned char * data; // pointer to .ttf file |
717 | int fontstart; // offset of start of font |
718 | |
719 | int numGlyphs; // number of glyphs, needed for range checking |
720 | |
721 | int loca,head,glyf,hhea,hmtx,kern,gpos,svg; // table locations as offset from start of .ttf |
722 | int index_map; // a cmap mapping for our chosen character encoding |
723 | int indexToLocFormat; // format needed to map from glyph index to glyph |
724 | |
725 | stbtt__buf cff; // cff font data |
726 | stbtt__buf charstrings; // the charstring index |
727 | stbtt__buf gsubrs; // global charstring subroutines index |
728 | stbtt__buf subrs; // private charstring subroutines index |
729 | stbtt__buf fontdicts; // array of font dicts |
730 | stbtt__buf fdselect; // map from glyph to fontdict |
731 | }; |
732 | |
733 | STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset); |
734 | // Given an offset into the file that defines a font, this function builds |
735 | // the necessary cached info for the rest of the system. You must allocate |
736 | // the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't |
737 | // need to do anything special to free it, because the contents are pure |
738 | // value data with no additional data structures. Returns 0 on failure. |
739 | |
740 | |
741 | ////////////////////////////////////////////////////////////////////////////// |
742 | // |
743 | // CHARACTER TO GLYPH-INDEX CONVERSIOn |
744 | |
745 | STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint); |
746 | // If you're going to perform multiple operations on the same character |
747 | // and you want a speed-up, call this function with the character you're |
748 | // going to process, then use glyph-based functions instead of the |
749 | // codepoint-based functions. |
750 | // Returns 0 if the character codepoint is not defined in the font. |
751 | |
752 | |
753 | ////////////////////////////////////////////////////////////////////////////// |
754 | // |
755 | // CHARACTER PROPERTIES |
756 | // |
757 | |
758 | STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels); |
759 | // computes a scale factor to produce a font whose "height" is 'pixels' tall. |
760 | // Height is measured as the distance from the highest ascender to the lowest |
761 | // descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics |
762 | // and computing: |
763 | // scale = pixels / (ascent - descent) |
764 | // so if you prefer to measure height by the ascent only, use a similar calculation. |
765 | |
766 | STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels); |
767 | // computes a scale factor to produce a font whose EM size is mapped to |
768 | // 'pixels' tall. This is probably what traditional APIs compute, but |
769 | // I'm not positive. |
770 | |
771 | STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap); |
772 | // ascent is the coordinate above the baseline the font extends; descent |
773 | // is the coordinate below the baseline the font extends (i.e. it is typically negative) |
774 | // lineGap is the spacing between one row's descent and the next row's ascent... |
775 | // so you should advance the vertical position by "*ascent - *descent + *lineGap" |
776 | // these are expressed in unscaled coordinates, so you must multiply by |
777 | // the scale factor for a given size |
778 | |
779 | STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap); |
780 | // analogous to GetFontVMetrics, but returns the "typographic" values from the OS/2 |
781 | // table (specific to MS/Windows TTF files). |
782 | // |
783 | // Returns 1 on success (table present), 0 on failure. |
784 | |
785 | STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1); |
786 | // the bounding box around all possible characters |
787 | |
788 | STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing); |
789 | // leftSideBearing is the offset from the current horizontal position to the left edge of the character |
790 | // advanceWidth is the offset from the current horizontal position to the next horizontal position |
791 | // these are expressed in unscaled coordinates |
792 | |
793 | STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2); |
794 | // an additional amount to add to the 'advance' value between ch1 and ch2 |
795 | |
796 | STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1); |
797 | // Gets the bounding box of the visible part of the glyph, in unscaled coordinates |
798 | |
799 | STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing); |
800 | STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2); |
801 | STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1); |
802 | // as above, but takes one or more glyph indices for greater efficiency |
803 | |
804 | typedef struct stbtt_kerningentry |
805 | { |
806 | int glyph1; // use stbtt_FindGlyphIndex |
807 | int glyph2; |
808 | int advance; |
809 | } stbtt_kerningentry; |
810 | |
811 | STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info); |
812 | STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length); |
813 | // Retrieves a complete list of all of the kerning pairs provided by the font |
814 | // stbtt_GetKerningTable never writes more than table_length entries and returns how many entries it did write. |
815 | // The table will be sorted by (a.glyph1 == b.glyph1)?(a.glyph2 < b.glyph2):(a.glyph1 < b.glyph1) |
816 | |
817 | ////////////////////////////////////////////////////////////////////////////// |
818 | // |
819 | // GLYPH SHAPES (you probably don't need these, but they have to go before |
820 | // the bitmaps for C declaration-order reasons) |
821 | // |
822 | |
823 | #ifndef STBTT_vmove // you can predefine these to use different values (but why?) |
824 | enum { |
825 | STBTT_vmove=1, |
826 | STBTT_vline, |
827 | STBTT_vcurve, |
828 | STBTT_vcubic |
829 | }; |
830 | #endif |
831 | |
832 | #ifndef stbtt_vertex // you can predefine this to use different values |
833 | // (we share this with other code at RAD) |
834 | #define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file |
835 | typedef struct |
836 | { |
837 | stbtt_vertex_type x,y,cx,cy,cx1,cy1; |
838 | unsigned char type,padding; |
839 | } stbtt_vertex; |
840 | #endif |
841 | |
842 | STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index); |
843 | // returns non-zero if nothing is drawn for this glyph |
844 | |
845 | STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices); |
846 | STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices); |
847 | // returns # of vertices and fills *vertices with the pointer to them |
848 | // these are expressed in "unscaled" coordinates |
849 | // |
850 | // The shape is a series of contours. Each one starts with |
851 | // a STBTT_moveto, then consists of a series of mixed |
852 | // STBTT_lineto and STBTT_curveto segments. A lineto |
853 | // draws a line from previous endpoint to its x,y; a curveto |
854 | // draws a quadratic bezier from previous endpoint to |
855 | // its x,y, using cx,cy as the bezier control point. |
856 | |
857 | STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices); |
858 | // frees the data allocated above |
859 | |
860 | STBTT_DEF unsigned char *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl); |
861 | STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg); |
862 | STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg); |
863 | // fills svg with the character's SVG data. |
864 | // returns data size or 0 if SVG not found. |
865 | |
866 | ////////////////////////////////////////////////////////////////////////////// |
867 | // |
868 | // BITMAP RENDERING |
869 | // |
870 | |
871 | STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata); |
872 | // frees the bitmap allocated below |
873 | |
874 | 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); |
875 | // allocates a large-enough single-channel 8bpp bitmap and renders the |
876 | // specified character/glyph at the specified scale into it, with |
877 | // antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque). |
878 | // *width & *height are filled out with the width & height of the bitmap, |
879 | // which is stored left-to-right, top-to-bottom. |
880 | // |
881 | // xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap |
882 | |
883 | 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); |
884 | // the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel |
885 | // shift for the character |
886 | |
887 | 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); |
888 | // the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap |
889 | // in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap |
890 | // is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the |
891 | // width and height and positioning info for it first. |
892 | |
893 | 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); |
894 | // same as stbtt_MakeCodepointBitmap, but you can specify a subpixel |
895 | // shift for the character |
896 | |
897 | STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint); |
898 | // same as stbtt_MakeCodepointBitmapSubpixel, but prefiltering |
899 | // is performed (see stbtt_PackSetOversampling) |
900 | |
901 | 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); |
902 | // get the bbox of the bitmap centered around the glyph origin; so the |
903 | // bitmap width is ix1-ix0, height is iy1-iy0, and location to place |
904 | // the bitmap top left is (leftSideBearing*scale,iy0). |
905 | // (Note that the bitmap uses y-increases-down, but the shape uses |
906 | // y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.) |
907 | |
908 | 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); |
909 | // same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel |
910 | // shift for the character |
911 | |
912 | // the following functions are equivalent to the above functions, but operate |
913 | // on glyph indices instead of Unicode codepoints (for efficiency) |
914 | 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); |
915 | 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); |
916 | 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); |
917 | 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); |
918 | STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int glyph); |
919 | 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); |
920 | 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); |
921 | |
922 | |
923 | // @TODO: don't expose this structure |
924 | typedef struct |
925 | { |
926 | int w,h,stride; |
927 | unsigned char *pixels; |
928 | } stbtt__bitmap; |
929 | |
930 | // rasterize a shape with quadratic beziers into a bitmap |
931 | STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, // 1-channel bitmap to draw into |
932 | float flatness_in_pixels, // allowable error of curve in pixels |
933 | stbtt_vertex *vertices, // array of vertices defining shape |
934 | int num_verts, // number of vertices in above array |
935 | float scale_x, float scale_y, // scale applied to input vertices |
936 | float shift_x, float shift_y, // translation applied to input vertices |
937 | int x_off, int y_off, // another translation applied to input |
938 | int invert, // if non-zero, vertically flip shape |
939 | void *userdata); // context for to STBTT_MALLOC |
940 | |
941 | ////////////////////////////////////////////////////////////////////////////// |
942 | // |
943 | // Signed Distance Function (or Field) rendering |
944 | |
945 | STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata); |
946 | // frees the SDF bitmap allocated below |
947 | |
948 | STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff); |
949 | STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff); |
950 | // These functions compute a discretized SDF field for a single character, suitable for storing |
951 | // in a single-channel texture, sampling with bilinear filtering, and testing against |
952 | // larger than some threshold to produce scalable fonts. |
953 | // info -- the font |
954 | // scale -- controls the size of the resulting SDF bitmap, same as it would be creating a regular bitmap |
955 | // glyph/codepoint -- the character to generate the SDF for |
956 | // padding -- extra "pixels" around the character which are filled with the distance to the character (not 0), |
957 | // which allows effects like bit outlines |
958 | // onedge_value -- value 0-255 to test the SDF against to reconstruct the character (i.e. the isocontour of the character) |
959 | // pixel_dist_scale -- what value the SDF should increase by when moving one SDF "pixel" away from the edge (on the 0..255 scale) |
960 | // if positive, > onedge_value is inside; if negative, < onedge_value is inside |
961 | // width,height -- output height & width of the SDF bitmap (including padding) |
962 | // xoff,yoff -- output origin of the character |
963 | // return value -- a 2D array of bytes 0..255, width*height in size |
964 | // |
965 | // pixel_dist_scale & onedge_value are a scale & bias that allows you to make |
966 | // optimal use of the limited 0..255 for your application, trading off precision |
967 | // and special effects. SDF values outside the range 0..255 are clamped to 0..255. |
968 | // |
969 | // Example: |
970 | // scale = stbtt_ScaleForPixelHeight(22) |
971 | // padding = 5 |
972 | // onedge_value = 180 |
973 | // pixel_dist_scale = 180/5.0 = 36.0 |
974 | // |
975 | // This will create an SDF bitmap in which the character is about 22 pixels |
976 | // high but the whole bitmap is about 22+5+5=32 pixels high. To produce a filled |
977 | // shape, sample the SDF at each pixel and fill the pixel if the SDF value |
978 | // is greater than or equal to 180/255. (You'll actually want to antialias, |
979 | // which is beyond the scope of this example.) Additionally, you can compute |
980 | // offset outlines (e.g. to stroke the character border inside & outside, |
981 | // or only outside). For example, to fill outside the character up to 3 SDF |
982 | // pixels, you would compare against (180-36.0*3)/255 = 72/255. The above |
983 | // choice of variables maps a range from 5 pixels outside the shape to |
984 | // 2 pixels inside the shape to 0..255; this is intended primarily for apply |
985 | // outside effects only (the interior range is needed to allow proper |
986 | // antialiasing of the font at *smaller* sizes) |
987 | // |
988 | // The function computes the SDF analytically at each SDF pixel, not by e.g. |
989 | // building a higher-res bitmap and approximating it. In theory the quality |
990 | // should be as high as possible for an SDF of this size & representation, but |
991 | // unclear if this is true in practice (perhaps building a higher-res bitmap |
992 | // and computing from that can allow drop-out prevention). |
993 | // |
994 | // The algorithm has not been optimized at all, so expect it to be slow |
995 | // if computing lots of characters or very large sizes. |
996 | |
997 | |
998 | |
999 | ////////////////////////////////////////////////////////////////////////////// |
1000 | // |
1001 | // Finding the right font... |
1002 | // |
1003 | // You should really just solve this offline, keep your own tables |
1004 | // of what font is what, and don't try to get it out of the .ttf file. |
1005 | // That's because getting it out of the .ttf file is really hard, because |
1006 | // the names in the file can appear in many possible encodings, in many |
1007 | // possible languages, and e.g. if you need a case-insensitive comparison, |
1008 | // the details of that depend on the encoding & language in a complex way |
1009 | // (actually underspecified in truetype, but also gigantic). |
1010 | // |
1011 | // But you can use the provided functions in two possible ways: |
1012 | // stbtt_FindMatchingFont() will use *case-sensitive* comparisons on |
1013 | // unicode-encoded names to try to find the font you want; |
1014 | // you can run this before calling stbtt_InitFont() |
1015 | // |
1016 | // stbtt_GetFontNameString() lets you get any of the various strings |
1017 | // from the file yourself and do your own comparisons on them. |
1018 | // You have to have called stbtt_InitFont() first. |
1019 | |
1020 | |
1021 | STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags); |
1022 | // returns the offset (not index) of the font that matches, or -1 if none |
1023 | // if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold". |
1024 | // if you use any other flag, use a font name like "Arial"; this checks |
1025 | // the 'macStyle' header field; i don't know if fonts set this consistently |
1026 | #define STBTT_MACSTYLE_DONTCARE 0 |
1027 | #define STBTT_MACSTYLE_BOLD 1 |
1028 | #define STBTT_MACSTYLE_ITALIC 2 |
1029 | #define STBTT_MACSTYLE_UNDERSCORE 4 |
1030 | #define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us check the bitfield is 0 |
1031 | |
1032 | STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2); |
1033 | // returns 1/0 whether the first string interpreted as utf8 is identical to |
1034 | // the second string interpreted as big-endian utf16... useful for strings from next func |
1035 | |
1036 | STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID); |
1037 | // returns the string (which may be big-endian double byte, e.g. for unicode) |
1038 | // and puts the length in bytes in *length. |
1039 | // |
1040 | // some of the values for the IDs are below; for more see the truetype spec: |
1041 | // http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html |
1042 | // http://www.microsoft.com/typography/otspec/name.htm |
1043 | |
1044 | enum { // platformID |
1045 | STBTT_PLATFORM_ID_UNICODE =0, |
1046 | STBTT_PLATFORM_ID_MAC =1, |
1047 | STBTT_PLATFORM_ID_ISO =2, |
1048 | STBTT_PLATFORM_ID_MICROSOFT =3 |
1049 | }; |
1050 | |
1051 | enum { // encodingID for STBTT_PLATFORM_ID_UNICODE |
1052 | STBTT_UNICODE_EID_UNICODE_1_0 =0, |
1053 | STBTT_UNICODE_EID_UNICODE_1_1 =1, |
1054 | STBTT_UNICODE_EID_ISO_10646 =2, |
1055 | STBTT_UNICODE_EID_UNICODE_2_0_BMP=3, |
1056 | STBTT_UNICODE_EID_UNICODE_2_0_FULL=4 |
1057 | }; |
1058 | |
1059 | enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT |
1060 | STBTT_MS_EID_SYMBOL =0, |
1061 | STBTT_MS_EID_UNICODE_BMP =1, |
1062 | STBTT_MS_EID_SHIFTJIS =2, |
1063 | STBTT_MS_EID_UNICODE_FULL =10 |
1064 | }; |
1065 | |
1066 | enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes |
1067 | STBTT_MAC_EID_ROMAN =0, STBTT_MAC_EID_ARABIC =4, |
1068 | STBTT_MAC_EID_JAPANESE =1, STBTT_MAC_EID_HEBREW =5, |
1069 | STBTT_MAC_EID_CHINESE_TRAD =2, STBTT_MAC_EID_GREEK =6, |
1070 | STBTT_MAC_EID_KOREAN =3, STBTT_MAC_EID_RUSSIAN =7 |
1071 | }; |
1072 | |
1073 | enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID... |
1074 | // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs |
1075 | STBTT_MS_LANG_ENGLISH =0x0409, STBTT_MS_LANG_ITALIAN =0x0410, |
1076 | STBTT_MS_LANG_CHINESE =0x0804, STBTT_MS_LANG_JAPANESE =0x0411, |
1077 | STBTT_MS_LANG_DUTCH =0x0413, STBTT_MS_LANG_KOREAN =0x0412, |
1078 | STBTT_MS_LANG_FRENCH =0x040c, STBTT_MS_LANG_RUSSIAN =0x0419, |
1079 | STBTT_MS_LANG_GERMAN =0x0407, STBTT_MS_LANG_SPANISH =0x0409, |
1080 | STBTT_MS_LANG_HEBREW =0x040d, STBTT_MS_LANG_SWEDISH =0x041D |
1081 | }; |
1082 | |
1083 | enum { // languageID for STBTT_PLATFORM_ID_MAC |
1084 | STBTT_MAC_LANG_ENGLISH =0 , STBTT_MAC_LANG_JAPANESE =11, |
1085 | STBTT_MAC_LANG_ARABIC =12, STBTT_MAC_LANG_KOREAN =23, |
1086 | STBTT_MAC_LANG_DUTCH =4 , STBTT_MAC_LANG_RUSSIAN =32, |
1087 | STBTT_MAC_LANG_FRENCH =1 , STBTT_MAC_LANG_SPANISH =6 , |
1088 | STBTT_MAC_LANG_GERMAN =2 , STBTT_MAC_LANG_SWEDISH =5 , |
1089 | STBTT_MAC_LANG_HEBREW =10, STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33, |
1090 | STBTT_MAC_LANG_ITALIAN =3 , STBTT_MAC_LANG_CHINESE_TRAD =19 |
1091 | }; |
1092 | |
1093 | #ifdef __cplusplus |
1094 | } |
1095 | #endif |
1096 | |
1097 | #endif // __STB_INCLUDE_STB_TRUETYPE_H__ |
1098 | |
1099 | /////////////////////////////////////////////////////////////////////////////// |
1100 | /////////////////////////////////////////////////////////////////////////////// |
1101 | //// |
1102 | //// IMPLEMENTATION |
1103 | //// |
1104 | //// |
1105 | |
1106 | #ifdef STB_TRUETYPE_IMPLEMENTATION |
1107 | |
1108 | #ifndef STBTT_MAX_OVERSAMPLE |
1109 | #define STBTT_MAX_OVERSAMPLE 8 |
1110 | #endif |
1111 | |
1112 | #if STBTT_MAX_OVERSAMPLE > 255 |
1113 | #error "STBTT_MAX_OVERSAMPLE cannot be > 255" |
1114 | #endif |
1115 | |
1116 | typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1]; |
1117 | |
1118 | #ifndef STBTT_RASTERIZER_VERSION |
1119 | #define STBTT_RASTERIZER_VERSION 2 |
1120 | #endif |
1121 | |
1122 | #ifdef _MSC_VER |
1123 | #define STBTT__NOTUSED(v) (void)(v) |
1124 | #else |
1125 | #define STBTT__NOTUSED(v) (void)sizeof(v) |
1126 | #endif |
1127 | |
1128 | ////////////////////////////////////////////////////////////////////////// |
1129 | // |
1130 | // stbtt__buf helpers to parse data from file |
1131 | // |
1132 | |
1133 | static stbtt_uint8 stbtt__buf_get8(stbtt__buf *b) |
1134 | { |
1135 | if (b->cursor >= b->size) |
1136 | return 0; |
1137 | return b->data[b->cursor++]; |
1138 | } |
1139 | |
1140 | static stbtt_uint8 stbtt__buf_peek8(stbtt__buf *b) |
1141 | { |
1142 | if (b->cursor >= b->size) |
1143 | return 0; |
1144 | return b->data[b->cursor]; |
1145 | } |
1146 | |
1147 | static void stbtt__buf_seek(stbtt__buf *b, int o) |
1148 | { |
1149 | STBTT_assert(!(o > b->size || o < 0)); |
1150 | b->cursor = (o > b->size || o < 0) ? b->size : o; |
1151 | } |
1152 | |
1153 | static void stbtt__buf_skip(stbtt__buf *b, int o) |
1154 | { |
1155 | stbtt__buf_seek(b, b->cursor + o); |
1156 | } |
1157 | |
1158 | static stbtt_uint32 stbtt__buf_get(stbtt__buf *b, int n) |
1159 | { |
1160 | stbtt_uint32 v = 0; |
1161 | int i; |
1162 | STBTT_assert(n >= 1 && n <= 4); |
1163 | for (i = 0; i < n; i++) |
1164 | v = (v << 8) | stbtt__buf_get8(b); |
1165 | return v; |
1166 | } |
1167 | |
1168 | static stbtt__buf stbtt__new_buf(const void *p, size_t size) |
1169 | { |
1170 | stbtt__buf r; |
1171 | STBTT_assert(size < 0x40000000); |
1172 | r.data = (stbtt_uint8*) p; |
1173 | r.size = (int) size; |
1174 | r.cursor = 0; |
1175 | return r; |
1176 | } |
1177 | |
1178 | #define stbtt__buf_get16(b) stbtt__buf_get((b), 2) |
1179 | #define stbtt__buf_get32(b) stbtt__buf_get((b), 4) |
1180 | |
1181 | static stbtt__buf stbtt__buf_range(const stbtt__buf *b, int o, int s) |
1182 | { |
1183 | stbtt__buf r = stbtt__new_buf(NULL, 0); |
1184 | if (o < 0 || s < 0 || o > b->size || s > b->size - o) return r; |
1185 | r.data = b->data + o; |
1186 | r.size = s; |
1187 | return r; |
1188 | } |
1189 | |
1190 | static stbtt__buf stbtt__cff_get_index(stbtt__buf *b) |
1191 | { |
1192 | int count, start, offsize; |
1193 | start = b->cursor; |
1194 | count = stbtt__buf_get16(b); |
1195 | if (count) { |
1196 | offsize = stbtt__buf_get8(b); |
1197 | STBTT_assert(offsize >= 1 && offsize <= 4); |
1198 | stbtt__buf_skip(b, offsize * count); |
1199 | stbtt__buf_skip(b, stbtt__buf_get(b, offsize) - 1); |
1200 | } |
1201 | return stbtt__buf_range(b, start, b->cursor - start); |
1202 | } |
1203 | |
1204 | static stbtt_uint32 stbtt__cff_int(stbtt__buf *b) |
1205 | { |
1206 | int b0 = stbtt__buf_get8(b); |
1207 | if (b0 >= 32 && b0 <= 246) return b0 - 139; |
1208 | else if (b0 >= 247 && b0 <= 250) return (b0 - 247)*256 + stbtt__buf_get8(b) + 108; |
1209 | else if (b0 >= 251 && b0 <= 254) return -(b0 - 251)*256 - stbtt__buf_get8(b) - 108; |
1210 | else if (b0 == 28) return stbtt__buf_get16(b); |
1211 | else if (b0 == 29) return stbtt__buf_get32(b); |
1212 | STBTT_assert(0); |
1213 | return 0; |
1214 | } |
1215 | |
1216 | static void stbtt__cff_skip_operand(stbtt__buf *b) { |
1217 | int v, b0 = stbtt__buf_peek8(b); |
1218 | STBTT_assert(b0 >= 28); |
1219 | if (b0 == 30) { |
1220 | stbtt__buf_skip(b, 1); |
1221 | while (b->cursor < b->size) { |
1222 | v = stbtt__buf_get8(b); |
1223 | if ((v & 0xF) == 0xF || (v >> 4) == 0xF) |
1224 | break; |
1225 | } |
1226 | } else { |
1227 | stbtt__cff_int(b); |
1228 | } |
1229 | } |
1230 | |
1231 | static stbtt__buf stbtt__dict_get(stbtt__buf *b, int key) |
1232 | { |
1233 | stbtt__buf_seek(b, 0); |
1234 | while (b->cursor < b->size) { |
1235 | int start = b->cursor, end, op; |
1236 | while (stbtt__buf_peek8(b) >= 28) |
1237 | stbtt__cff_skip_operand(b); |
1238 | end = b->cursor; |
1239 | op = stbtt__buf_get8(b); |
1240 | if (op == 12) op = stbtt__buf_get8(b) | 0x100; |
1241 | if (op == key) return stbtt__buf_range(b, start, end-start); |
1242 | } |
1243 | return stbtt__buf_range(b, 0, 0); |
1244 | } |
1245 | |
1246 | static void stbtt__dict_get_ints(stbtt__buf *b, int key, int outcount, stbtt_uint32 *out) |
1247 | { |
1248 | int i; |
1249 | stbtt__buf operands = stbtt__dict_get(b, key); |
1250 | for (i = 0; i < outcount && operands.cursor < operands.size; i++) |
1251 | out[i] = stbtt__cff_int(&operands); |
1252 | } |
1253 | |
1254 | static int stbtt__cff_index_count(stbtt__buf *b) |
1255 | { |
1256 | stbtt__buf_seek(b, 0); |
1257 | return stbtt__buf_get16(b); |
1258 | } |
1259 | |
1260 | static stbtt__buf stbtt__cff_index_get(stbtt__buf b, int i) |
1261 | { |
1262 | int count, offsize, start, end; |
1263 | stbtt__buf_seek(&b, 0); |
1264 | count = stbtt__buf_get16(&b); |
1265 | offsize = stbtt__buf_get8(&b); |
1266 | STBTT_assert(i >= 0 && i < count); |
1267 | STBTT_assert(offsize >= 1 && offsize <= 4); |
1268 | stbtt__buf_skip(&b, i*offsize); |
1269 | start = stbtt__buf_get(&b, offsize); |
1270 | end = stbtt__buf_get(&b, offsize); |
1271 | return stbtt__buf_range(&b, 2+(count+1)*offsize+start, end - start); |
1272 | } |
1273 | |
1274 | ////////////////////////////////////////////////////////////////////////// |
1275 | // |
1276 | // accessors to parse data from file |
1277 | // |
1278 | |
1279 | // on platforms that don't allow misaligned reads, if we want to allow |
1280 | // truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE |
1281 | |
1282 | #define ttBYTE(p) (* (stbtt_uint8 *) (p)) |
1283 | #define ttCHAR(p) (* (stbtt_int8 *) (p)) |
1284 | #define ttFixed(p) ttLONG(p) |
1285 | |
1286 | static stbtt_uint16 ttUSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; } |
1287 | static stbtt_int16 ttSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; } |
1288 | static stbtt_uint32 ttULONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; } |
1289 | static stbtt_int32 ttLONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; } |
1290 | |
1291 | #define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3)) |
1292 | #define stbtt_tag(p,str) stbtt_tag4(p,str[0],str[1],str[2],str[3]) |
1293 | |
1294 | static int stbtt__isfont(stbtt_uint8 *font) |
1295 | { |
1296 | // check the version number |
1297 | if (stbtt_tag4(font, '1',0,0,0)) return 1; // TrueType 1 |
1298 | if (stbtt_tag(font, "typ1")) return 1; // TrueType with type 1 font -- we don't support this! |
1299 | if (stbtt_tag(font, "OTTO")) return 1; // OpenType with CFF |
1300 | if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0 |
1301 | if (stbtt_tag(font, "true")) return 1; // Apple specification for TrueType fonts |
1302 | return 0; |
1303 | } |
1304 | |
1305 | // @OPTIMIZE: binary search |
1306 | static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag) |
1307 | { |
1308 | stbtt_int32 num_tables = ttUSHORT(data+fontstart+4); |
1309 | stbtt_uint32 tabledir = fontstart + 12; |
1310 | stbtt_int32 i; |
1311 | for (i=0; i < num_tables; ++i) { |
1312 | stbtt_uint32 loc = tabledir + 16*i; |
1313 | if (stbtt_tag(data+loc+0, tag)) |
1314 | return ttULONG(data+loc+8); |
1315 | } |
1316 | return 0; |
1317 | } |
1318 | |
1319 | static int stbtt_GetFontOffsetForIndex_internal(unsigned char *font_collection, int index) |
1320 | { |
1321 | // if it's just a font, there's only one valid index |
1322 | if (stbtt__isfont(font_collection)) |
1323 | return index == 0 ? 0 : -1; |
1324 | |
1325 | // check if it's a TTC |
1326 | if (stbtt_tag(font_collection, "ttcf")) { |
1327 | // version 1? |
1328 | if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) { |
1329 | stbtt_int32 n = ttLONG(font_collection+8); |
1330 | if (index >= n) |
1331 | return -1; |
1332 | return ttULONG(font_collection+12+index*4); |
1333 | } |
1334 | } |
1335 | return -1; |
1336 | } |
1337 | |
1338 | static int stbtt_GetNumberOfFonts_internal(unsigned char *font_collection) |
1339 | { |
1340 | // if it's just a font, there's only one valid font |
1341 | if (stbtt__isfont(font_collection)) |
1342 | return 1; |
1343 | |
1344 | // check if it's a TTC |
1345 | if (stbtt_tag(font_collection, "ttcf")) { |
1346 | // version 1? |
1347 | if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) { |
1348 | return ttLONG(font_collection+8); |
1349 | } |
1350 | } |
1351 | return 0; |
1352 | } |
1353 | |
1354 | static stbtt__buf stbtt__get_subrs(stbtt__buf cff, stbtt__buf fontdict) |
1355 | { |
1356 | stbtt_uint32 subrsoff = 0, private_loc[2] = { 0, 0 }; |
1357 | stbtt__buf pdict; |
1358 | stbtt__dict_get_ints(&fontdict, 18, 2, private_loc); |
1359 | if (!private_loc[1] || !private_loc[0]) return stbtt__new_buf(NULL, 0); |
1360 | pdict = stbtt__buf_range(&cff, private_loc[1], private_loc[0]); |
1361 | stbtt__dict_get_ints(&pdict, 19, 1, &subrsoff); |
1362 | if (!subrsoff) return stbtt__new_buf(NULL, 0); |
1363 | stbtt__buf_seek(&cff, private_loc[1]+subrsoff); |
1364 | return stbtt__cff_get_index(&cff); |
1365 | } |
1366 | |
1367 | // since most people won't use this, find this table the first time it's needed |
1368 | static int stbtt__get_svg(stbtt_fontinfo *info) |
1369 | { |
1370 | stbtt_uint32 t; |
1371 | if (info->svg < 0) { |
1372 | t = stbtt__find_table(info->data, info->fontstart, "SVG "); |
1373 | if (t) { |
1374 | stbtt_uint32 offset = ttULONG(info->data + t + 2); |
1375 | info->svg = t + offset; |
1376 | } else { |
1377 | info->svg = 0; |
1378 | } |
1379 | } |
1380 | return info->svg; |
1381 | } |
1382 | |
1383 | static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart) |
1384 | { |
1385 | stbtt_uint32 cmap, t; |
1386 | stbtt_int32 i,numTables; |
1387 | |
1388 | info->data = data; |
1389 | info->fontstart = fontstart; |
1390 | info->cff = stbtt__new_buf(NULL, 0); |
1391 | |
1392 | cmap = stbtt__find_table(data, fontstart, "cmap"); // required |
1393 | info->loca = stbtt__find_table(data, fontstart, "loca"); // required |
1394 | info->head = stbtt__find_table(data, fontstart, "head"); // required |
1395 | info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required |
1396 | info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required |
1397 | info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required |
1398 | info->kern = stbtt__find_table(data, fontstart, "kern"); // not required |
1399 | info->gpos = stbtt__find_table(data, fontstart, "GPOS"); // not required |
1400 | |
1401 | if (!cmap || !info->head || !info->hhea || !info->hmtx) |
1402 | return 0; |
1403 | if (info->glyf) { |
1404 | // required for truetype |
1405 | if (!info->loca) return 0; |
1406 | } else { |
1407 | // initialization for CFF / Type2 fonts (OTF) |
1408 | stbtt__buf b, topdict, topdictidx; |
1409 | stbtt_uint32 cstype = 2, charstrings = 0, fdarrayoff = 0, fdselectoff = 0; |
1410 | stbtt_uint32 cff; |
1411 | |
1412 | cff = stbtt__find_table(data, fontstart, "CFF "); |
1413 | if (!cff) return 0; |
1414 | |
1415 | info->fontdicts = stbtt__new_buf(NULL, 0); |
1416 | info->fdselect = stbtt__new_buf(NULL, 0); |
1417 | |
1418 | // @TODO this should use size from table (not 512MB) |
1419 | info->cff = stbtt__new_buf(data+cff, 512*1024*1024); |
1420 | b = info->cff; |
1421 | |
1422 | // read the header |
1423 | stbtt__buf_skip(&b, 2); |
1424 | stbtt__buf_seek(&b, stbtt__buf_get8(&b)); // hdrsize |
1425 | |
1426 | // @TODO the name INDEX could list multiple fonts, |
1427 | // but we just use the first one. |
1428 | stbtt__cff_get_index(&b); // name INDEX |
1429 | topdictidx = stbtt__cff_get_index(&b); |
1430 | topdict = stbtt__cff_index_get(topdictidx, 0); |
1431 | stbtt__cff_get_index(&b); // string INDEX |
1432 | info->gsubrs = stbtt__cff_get_index(&b); |
1433 | |
1434 | stbtt__dict_get_ints(&topdict, 17, 1, &charstrings); |
1435 | stbtt__dict_get_ints(&topdict, 0x100 | 6, 1, &cstype); |
1436 | stbtt__dict_get_ints(&topdict, 0x100 | 36, 1, &fdarrayoff); |
1437 | stbtt__dict_get_ints(&topdict, 0x100 | 37, 1, &fdselectoff); |
1438 | info->subrs = stbtt__get_subrs(b, topdict); |
1439 | |
1440 | // we only support Type 2 charstrings |
1441 | if (cstype != 2) return 0; |
1442 | if (charstrings == 0) return 0; |
1443 | |
1444 | if (fdarrayoff) { |
1445 | // looks like a CID font |
1446 | if (!fdselectoff) return 0; |
1447 | stbtt__buf_seek(&b, fdarrayoff); |
1448 | info->fontdicts = stbtt__cff_get_index(&b); |
1449 | info->fdselect = stbtt__buf_range(&b, fdselectoff, b.size-fdselectoff); |
1450 | } |
1451 | |
1452 | stbtt__buf_seek(&b, charstrings); |
1453 | info->charstrings = stbtt__cff_get_index(&b); |
1454 | } |
1455 | |
1456 | t = stbtt__find_table(data, fontstart, "maxp"); |
1457 | if (t) |
1458 | info->numGlyphs = ttUSHORT(data+t+4); |
1459 | else |
1460 | info->numGlyphs = 0xffff; |
1461 | |
1462 | info->svg = -1; |
1463 | |
1464 | // find a cmap encoding table we understand *now* to avoid searching |
1465 | // later. (todo: could make this installable) |
1466 | // the same regardless of glyph. |
1467 | numTables = ttUSHORT(data + cmap + 2); |
1468 | info->index_map = 0; |
1469 | for (i=0; i < numTables; ++i) { |
1470 | stbtt_uint32 encoding_record = cmap + 4 + 8 * i; |
1471 | // find an encoding we understand: |
1472 | switch(ttUSHORT(data+encoding_record)) { |
1473 | case STBTT_PLATFORM_ID_MICROSOFT: |
1474 | switch (ttUSHORT(data+encoding_record+2)) { |
1475 | case STBTT_MS_EID_UNICODE_BMP: |
1476 | case STBTT_MS_EID_UNICODE_FULL: |
1477 | // MS/Unicode |
1478 | info->index_map = cmap + ttULONG(data+encoding_record+4); |
1479 | break; |
1480 | } |
1481 | break; |
1482 | case STBTT_PLATFORM_ID_UNICODE: |
1483 | // Mac/iOS has these |
1484 | // all the encodingIDs are unicode, so we don't bother to check it |
1485 | info->index_map = cmap + ttULONG(data+encoding_record+4); |
1486 | break; |
1487 | } |
1488 | } |
1489 | if (info->index_map == 0) |
1490 | return 0; |
1491 | |
1492 | info->indexToLocFormat = ttUSHORT(data+info->head + 50); |
1493 | return 1; |
1494 | } |
1495 | |
1496 | STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint) |
1497 | { |
1498 | stbtt_uint8 *data = info->data; |
1499 | stbtt_uint32 index_map = info->index_map; |
1500 | |
1501 | stbtt_uint16 format = ttUSHORT(data + index_map + 0); |
1502 | if (format == 0) { // apple byte encoding |
1503 | stbtt_int32 bytes = ttUSHORT(data + index_map + 2); |
1504 | if (unicode_codepoint < bytes-6) |
1505 | return ttBYTE(data + index_map + 6 + unicode_codepoint); |
1506 | return 0; |
1507 | } else if (format == 6) { |
1508 | stbtt_uint32 first = ttUSHORT(data + index_map + 6); |
1509 | stbtt_uint32 count = ttUSHORT(data + index_map + 8); |
1510 | if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count) |
1511 | return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2); |
1512 | return 0; |
1513 | } else if (format == 2) { |
1514 | STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean |
1515 | return 0; |
1516 | } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges |
1517 | stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1; |
1518 | stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1; |
1519 | stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10); |
1520 | stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1; |
1521 | |
1522 | // do a binary search of the segments |
1523 | stbtt_uint32 endCount = index_map + 14; |
1524 | stbtt_uint32 search = endCount; |
1525 | |
1526 | if (unicode_codepoint > 0xffff) |
1527 | return 0; |
1528 | |
1529 | // they lie from endCount .. endCount + segCount |
1530 | // but searchRange is the nearest power of two, so... |
1531 | if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2)) |
1532 | search += rangeShift*2; |
1533 | |
1534 | // now decrement to bias correctly to find smallest |
1535 | search -= 2; |
1536 | while (entrySelector) { |
1537 | stbtt_uint16 end; |
1538 | searchRange >>= 1; |
1539 | end = ttUSHORT(data + search + searchRange*2); |
1540 | if (unicode_codepoint > end) |
1541 | search += searchRange*2; |
1542 | --entrySelector; |
1543 | } |
1544 | search += 2; |
1545 | |
1546 | { |
1547 | stbtt_uint16 offset, start, last; |
1548 | stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1); |
1549 | |
1550 | start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item); |
1551 | last = ttUSHORT(data + endCount + 2*item); |
1552 | if (unicode_codepoint < start || unicode_codepoint > last) |
1553 | return 0; |
1554 | |
1555 | offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item); |
1556 | if (offset == 0) |
1557 | return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item)); |
1558 | |
1559 | return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item); |
1560 | } |
1561 | } else if (format == 12 || format == 13) { |
1562 | stbtt_uint32 ngroups = ttULONG(data+index_map+12); |
1563 | stbtt_int32 low,high; |
1564 | low = 0; high = (stbtt_int32)ngroups; |
1565 | // Binary search the right group. |
1566 | while (low < high) { |
1567 | stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high |
1568 | stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12); |
1569 | stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4); |
1570 | if ((stbtt_uint32) unicode_codepoint < start_char) |
1571 | high = mid; |
1572 | else if ((stbtt_uint32) unicode_codepoint > end_char) |
1573 | low = mid+1; |
1574 | else { |
1575 | stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8); |
1576 | if (format == 12) |
1577 | return start_glyph + unicode_codepoint-start_char; |
1578 | else // format == 13 |
1579 | return start_glyph; |
1580 | } |
1581 | } |
1582 | return 0; // not found |
1583 | } |
1584 | // @TODO |
1585 | STBTT_assert(0); |
1586 | return 0; |
1587 | } |
1588 | |
1589 | STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices) |
1590 | { |
1591 | return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices); |
1592 | } |
1593 | |
1594 | static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy) |
1595 | { |
1596 | v->type = type; |
1597 | v->x = (stbtt_int16) x; |
1598 | v->y = (stbtt_int16) y; |
1599 | v->cx = (stbtt_int16) cx; |
1600 | v->cy = (stbtt_int16) cy; |
1601 | } |
1602 | |
1603 | static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index) |
1604 | { |
1605 | int g1,g2; |
1606 | |
1607 | STBTT_assert(!info->cff.size); |
1608 | |
1609 | if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range |
1610 | if (info->indexToLocFormat >= 2) return -1; // unknown index->glyph map format |
1611 | |
1612 | if (info->indexToLocFormat == 0) { |
1613 | g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2; |
1614 | g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2; |
1615 | } else { |
1616 | g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4); |
1617 | g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4); |
1618 | } |
1619 | |
1620 | return g1==g2 ? -1 : g1; // if length is 0, return -1 |
1621 | } |
1622 | |
1623 | static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1); |
1624 | |
1625 | STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1) |
1626 | { |
1627 | if (info->cff.size) { |
1628 | stbtt__GetGlyphInfoT2(info, glyph_index, x0, y0, x1, y1); |
1629 | } else { |
1630 | int g = stbtt__GetGlyfOffset(info, glyph_index); |
1631 | if (g < 0) return 0; |
1632 | |
1633 | if (x0) *x0 = ttSHORT(info->data + g + 2); |
1634 | if (y0) *y0 = ttSHORT(info->data + g + 4); |
1635 | if (x1) *x1 = ttSHORT(info->data + g + 6); |
1636 | if (y1) *y1 = ttSHORT(info->data + g + 8); |
1637 | } |
1638 | return 1; |
1639 | } |
1640 | |
1641 | STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1) |
1642 | { |
1643 | return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1); |
1644 | } |
1645 | |
1646 | STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index) |
1647 | { |
1648 | stbtt_int16 numberOfContours; |
1649 | int g; |
1650 | if (info->cff.size) |
1651 | return stbtt__GetGlyphInfoT2(info, glyph_index, NULL, NULL, NULL, NULL) == 0; |
1652 | g = stbtt__GetGlyfOffset(info, glyph_index); |
1653 | if (g < 0) return 1; |
1654 | numberOfContours = ttSHORT(info->data + g); |
1655 | return numberOfContours == 0; |
1656 | } |
1657 | |
1658 | static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off, |
1659 | stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy) |
1660 | { |
1661 | if (start_off) { |
1662 | if (was_off) |
1663 | stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy); |
1664 | stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy); |
1665 | } else { |
1666 | if (was_off) |
1667 | stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy); |
1668 | else |
1669 | stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0); |
1670 | } |
1671 | return num_vertices; |
1672 | } |
1673 | |
1674 | static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) |
1675 | { |
1676 | stbtt_int16 numberOfContours; |
1677 | stbtt_uint8 *endPtsOfContours; |
1678 | stbtt_uint8 *data = info->data; |
1679 | stbtt_vertex *vertices=0; |
1680 | int num_vertices=0; |
1681 | int g = stbtt__GetGlyfOffset(info, glyph_index); |
1682 | |
1683 | *pvertices = NULL; |
1684 | |
1685 | if (g < 0) return 0; |
1686 | |
1687 | numberOfContours = ttSHORT(data + g); |
1688 | |
1689 | if (numberOfContours > 0) { |
1690 | stbtt_uint8 flags=0,flagcount; |
1691 | stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0; |
1692 | stbtt_int32 x,y,cx,cy,sx,sy, scx,scy; |
1693 | stbtt_uint8 *points; |
1694 | endPtsOfContours = (data + g + 10); |
1695 | ins = ttUSHORT(data + g + 10 + numberOfContours * 2); |
1696 | points = data + g + 10 + numberOfContours * 2 + 2 + ins; |
1697 | |
1698 | n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2); |
1699 | |
1700 | m = n + 2*numberOfContours; // a loose bound on how many vertices we might need |
1701 | vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata); |
1702 | if (vertices == 0) |
1703 | return 0; |
1704 | |
1705 | next_move = 0; |
1706 | flagcount=0; |
1707 | |
1708 | // in first pass, we load uninterpreted data into the allocated array |
1709 | // above, shifted to the end of the array so we won't overwrite it when |
1710 | // we create our final data starting from the front |
1711 | |
1712 | off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated |
1713 | |
1714 | // first load flags |
1715 | |
1716 | for (i=0; i < n; ++i) { |
1717 | if (flagcount == 0) { |
1718 | flags = *points++; |
1719 | if (flags & 8) |
1720 | flagcount = *points++; |
1721 | } else |
1722 | --flagcount; |
1723 | vertices[off+i].type = flags; |
1724 | } |
1725 | |
1726 | // now load x coordinates |
1727 | x=0; |
1728 | for (i=0; i < n; ++i) { |
1729 | flags = vertices[off+i].type; |
1730 | if (flags & 2) { |
1731 | stbtt_int16 dx = *points++; |
1732 | x += (flags & 16) ? dx : -dx; // ??? |
1733 | } else { |
1734 | if (!(flags & 16)) { |
1735 | x = x + (stbtt_int16) (points[0]*256 + points[1]); |
1736 | points += 2; |
1737 | } |
1738 | } |
1739 | vertices[off+i].x = (stbtt_int16) x; |
1740 | } |
1741 | |
1742 | // now load y coordinates |
1743 | y=0; |
1744 | for (i=0; i < n; ++i) { |
1745 | flags = vertices[off+i].type; |
1746 | if (flags & 4) { |
1747 | stbtt_int16 dy = *points++; |
1748 | y += (flags & 32) ? dy : -dy; // ??? |
1749 | } else { |
1750 | if (!(flags & 32)) { |
1751 | y = y + (stbtt_int16) (points[0]*256 + points[1]); |
1752 | points += 2; |
1753 | } |
1754 | } |
1755 | vertices[off+i].y = (stbtt_int16) y; |
1756 | } |
1757 | |
1758 | // now convert them to our format |
1759 | num_vertices=0; |
1760 | sx = sy = cx = cy = scx = scy = 0; |
1761 | for (i=0; i < n; ++i) { |
1762 | flags = vertices[off+i].type; |
1763 | x = (stbtt_int16) vertices[off+i].x; |
1764 | y = (stbtt_int16) vertices[off+i].y; |
1765 | |
1766 | if (next_move == i) { |
1767 | if (i != 0) |
1768 | num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy); |
1769 | |
1770 | // now start the new one |
1771 | start_off = !(flags & 1); |
1772 | if (start_off) { |
1773 | // if we start off with an off-curve point, then when we need to find a point on the curve |
1774 | // where we can start, and we need to save some state for when we wraparound. |
1775 | scx = x; |
1776 | scy = y; |
1777 | if (!(vertices[off+i+1].type & 1)) { |
1778 | // next point is also a curve point, so interpolate an on-point curve |
1779 | sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1; |
1780 | sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1; |
1781 | } else { |
1782 | // otherwise just use the next point as our start point |
1783 | sx = (stbtt_int32) vertices[off+i+1].x; |
1784 | sy = (stbtt_int32) vertices[off+i+1].y; |
1785 | ++i; // we're using point i+1 as the starting point, so skip it |
1786 | } |
1787 | } else { |
1788 | sx = x; |
1789 | sy = y; |
1790 | } |
1791 | stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0); |
1792 | was_off = 0; |
1793 | next_move = 1 + ttUSHORT(endPtsOfContours+j*2); |
1794 | ++j; |
1795 | } else { |
1796 | if (!(flags & 1)) { // if it's a curve |
1797 | if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint |
1798 | stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy); |
1799 | cx = x; |
1800 | cy = y; |
1801 | was_off = 1; |
1802 | } else { |
1803 | if (was_off) |
1804 | stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy); |
1805 | else |
1806 | stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0); |
1807 | was_off = 0; |
1808 | } |
1809 | } |
1810 | } |
1811 | num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy); |
1812 | } else if (numberOfContours < 0) { |
1813 | // Compound shapes. |
1814 | int more = 1; |
1815 | stbtt_uint8 *comp = data + g + 10; |
1816 | num_vertices = 0; |
1817 | vertices = 0; |
1818 | while (more) { |
1819 | stbtt_uint16 flags, gidx; |
1820 | int comp_num_verts = 0, i; |
1821 | stbtt_vertex *comp_verts = 0, *tmp = 0; |
1822 | float mtx[6] = {1,0,0,1,0,0}, m, n; |
1823 | |
1824 | flags = ttSHORT(comp); comp+=2; |
1825 | gidx = ttSHORT(comp); comp+=2; |
1826 | |
1827 | if (flags & 2) { // XY values |
1828 | if (flags & 1) { // shorts |
1829 | mtx[4] = ttSHORT(comp); comp+=2; |
1830 | mtx[5] = ttSHORT(comp); comp+=2; |
1831 | } else { |
1832 | mtx[4] = ttCHAR(comp); comp+=1; |
1833 | mtx[5] = ttCHAR(comp); comp+=1; |
1834 | } |
1835 | } |
1836 | else { |
1837 | // @TODO handle matching point |
1838 | STBTT_assert(0); |
1839 | } |
1840 | if (flags & (1<<3)) { // WE_HAVE_A_SCALE |
1841 | mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2; |
1842 | mtx[1] = mtx[2] = 0; |
1843 | } else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE |
1844 | mtx[0] = ttSHORT(comp)/16384.0f; comp+=2; |
1845 | mtx[1] = mtx[2] = 0; |
1846 | mtx[3] = ttSHORT(comp)/16384.0f; comp+=2; |
1847 | } else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO |
1848 | mtx[0] = ttSHORT(comp)/16384.0f; comp+=2; |
1849 | mtx[1] = ttSHORT(comp)/16384.0f; comp+=2; |
1850 | mtx[2] = ttSHORT(comp)/16384.0f; comp+=2; |
1851 | mtx[3] = ttSHORT(comp)/16384.0f; comp+=2; |
1852 | } |
1853 | |
1854 | // Find transformation scales. |
1855 | m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]); |
1856 | n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]); |
1857 | |
1858 | // Get indexed glyph. |
1859 | comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts); |
1860 | if (comp_num_verts > 0) { |
1861 | // Transform vertices. |
1862 | for (i = 0; i < comp_num_verts; ++i) { |
1863 | stbtt_vertex* v = &comp_verts[i]; |
1864 | stbtt_vertex_type x,y; |
1865 | x=v->x; y=v->y; |
1866 | v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4])); |
1867 | v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5])); |
1868 | x=v->cx; y=v->cy; |
1869 | v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4])); |
1870 | v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5])); |
1871 | } |
1872 | // Append vertices. |
1873 | tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata); |
1874 | if (!tmp) { |
1875 | if (vertices) STBTT_free(vertices, info->userdata); |
1876 | if (comp_verts) STBTT_free(comp_verts, info->userdata); |
1877 | return 0; |
1878 | } |
1879 | if (num_vertices > 0 && vertices) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex)); |
1880 | STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex)); |
1881 | if (vertices) STBTT_free(vertices, info->userdata); |
1882 | vertices = tmp; |
1883 | STBTT_free(comp_verts, info->userdata); |
1884 | num_vertices += comp_num_verts; |
1885 | } |
1886 | // More components ? |
1887 | more = flags & (1<<5); |
1888 | } |
1889 | } else { |
1890 | // numberOfCounters == 0, do nothing |
1891 | } |
1892 | |
1893 | *pvertices = vertices; |
1894 | return num_vertices; |
1895 | } |
1896 | |
1897 | typedef struct |
1898 | { |
1899 | int bounds; |
1900 | int started; |
1901 | float first_x, first_y; |
1902 | float x, y; |
1903 | stbtt_int32 min_x, max_x, min_y, max_y; |
1904 | |
1905 | stbtt_vertex *pvertices; |
1906 | int num_vertices; |
1907 | } stbtt__csctx; |
1908 | |
1909 | #define STBTT__CSCTX_INIT(bounds) {bounds,0, 0,0, 0,0, 0,0,0,0, NULL, 0} |
1910 | |
1911 | static void stbtt__track_vertex(stbtt__csctx *c, stbtt_int32 x, stbtt_int32 y) |
1912 | { |
1913 | if (x > c->max_x || !c->started) c->max_x = x; |
1914 | if (y > c->max_y || !c->started) c->max_y = y; |
1915 | if (x < c->min_x || !c->started) c->min_x = x; |
1916 | if (y < c->min_y || !c->started) c->min_y = y; |
1917 | c->started = 1; |
1918 | } |
1919 | |
1920 | static void stbtt__csctx_v(stbtt__csctx *c, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy, stbtt_int32 cx1, stbtt_int32 cy1) |
1921 | { |
1922 | if (c->bounds) { |
1923 | stbtt__track_vertex(c, x, y); |
1924 | if (type == STBTT_vcubic) { |
1925 | stbtt__track_vertex(c, cx, cy); |
1926 | stbtt__track_vertex(c, cx1, cy1); |
1927 | } |
1928 | } else { |
1929 | stbtt_setvertex(&c->pvertices[c->num_vertices], type, x, y, cx, cy); |
1930 | c->pvertices[c->num_vertices].cx1 = (stbtt_int16) cx1; |
1931 | c->pvertices[c->num_vertices].cy1 = (stbtt_int16) cy1; |
1932 | } |
1933 | c->num_vertices++; |
1934 | } |
1935 | |
1936 | static void stbtt__csctx_close_shape(stbtt__csctx *ctx) |
1937 | { |
1938 | if (ctx->first_x != ctx->x || ctx->first_y != ctx->y) |
1939 | stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->first_x, (int)ctx->first_y, 0, 0, 0, 0); |
1940 | } |
1941 | |
1942 | static void stbtt__csctx_rmove_to(stbtt__csctx *ctx, float dx, float dy) |
1943 | { |
1944 | stbtt__csctx_close_shape(ctx); |
1945 | ctx->first_x = ctx->x = ctx->x + dx; |
1946 | ctx->first_y = ctx->y = ctx->y + dy; |
1947 | stbtt__csctx_v(ctx, STBTT_vmove, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0); |
1948 | } |
1949 | |
1950 | static void stbtt__csctx_rline_to(stbtt__csctx *ctx, float dx, float dy) |
1951 | { |
1952 | ctx->x += dx; |
1953 | ctx->y += dy; |
1954 | stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0); |
1955 | } |
1956 | |
1957 | static void stbtt__csctx_rccurve_to(stbtt__csctx *ctx, float dx1, float dy1, float dx2, float dy2, float dx3, float dy3) |
1958 | { |
1959 | float cx1 = ctx->x + dx1; |
1960 | float cy1 = ctx->y + dy1; |
1961 | float cx2 = cx1 + dx2; |
1962 | float cy2 = cy1 + dy2; |
1963 | ctx->x = cx2 + dx3; |
1964 | ctx->y = cy2 + dy3; |
1965 | stbtt__csctx_v(ctx, STBTT_vcubic, (int)ctx->x, (int)ctx->y, (int)cx1, (int)cy1, (int)cx2, (int)cy2); |
1966 | } |
1967 | |
1968 | static stbtt__buf stbtt__get_subr(stbtt__buf idx, int n) |
1969 | { |
1970 | int count = stbtt__cff_index_count(&idx); |
1971 | int bias = 107; |
1972 | if (count >= 33900) |
1973 | bias = 32768; |
1974 | else if (count >= 1240) |
1975 | bias = 1131; |
1976 | n += bias; |
1977 | if (n < 0 || n >= count) |
1978 | return stbtt__new_buf(NULL, 0); |
1979 | return stbtt__cff_index_get(idx, n); |
1980 | } |
1981 | |
1982 | static stbtt__buf stbtt__cid_get_glyph_subrs(const stbtt_fontinfo *info, int glyph_index) |
1983 | { |
1984 | stbtt__buf fdselect = info->fdselect; |
1985 | int nranges, start, end, v, fmt, fdselector = -1, i; |
1986 | |
1987 | stbtt__buf_seek(&fdselect, 0); |
1988 | fmt = stbtt__buf_get8(&fdselect); |
1989 | if (fmt == 0) { |
1990 | // untested |
1991 | stbtt__buf_skip(&fdselect, glyph_index); |
1992 | fdselector = stbtt__buf_get8(&fdselect); |
1993 | } else if (fmt == 3) { |
1994 | nranges = stbtt__buf_get16(&fdselect); |
1995 | start = stbtt__buf_get16(&fdselect); |
1996 | for (i = 0; i < nranges; i++) { |
1997 | v = stbtt__buf_get8(&fdselect); |
1998 | end = stbtt__buf_get16(&fdselect); |
1999 | if (glyph_index >= start && glyph_index < end) { |
2000 | fdselector = v; |
2001 | break; |
2002 | } |
2003 | start = end; |
2004 | } |
2005 | } |
2006 | if (fdselector == -1) stbtt__new_buf(NULL, 0); |
2007 | return stbtt__get_subrs(info->cff, stbtt__cff_index_get(info->fontdicts, fdselector)); |
2008 | } |
2009 | |
2010 | static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, stbtt__csctx *c) |
2011 | { |
2012 | int in_header = 1, maskbits = 0, subr_stack_height = 0, sp = 0, v, i, b0; |
2013 | int has_subrs = 0, clear_stack; |
2014 | float s[48]; |
2015 | stbtt__buf subr_stack[10], subrs = info->subrs, b; |
2016 | float f; |
2017 | |
2018 | #define STBTT__CSERR(s) (0) |
2019 | |
2020 | // this currently ignores the initial width value, which isn't needed if we have hmtx |
2021 | b = stbtt__cff_index_get(info->charstrings, glyph_index); |
2022 | while (b.cursor < b.size) { |
2023 | i = 0; |
2024 | clear_stack = 1; |
2025 | b0 = stbtt__buf_get8(&b); |
2026 | switch (b0) { |
2027 | // @TODO implement hinting |
2028 | case 0x13: // hintmask |
2029 | case 0x14: // cntrmask |
2030 | if (in_header) |
2031 | maskbits += (sp / 2); // implicit "vstem" |
2032 | in_header = 0; |
2033 | stbtt__buf_skip(&b, (maskbits + 7) / 8); |
2034 | break; |
2035 | |
2036 | case 0x01: // hstem |
2037 | case 0x03: // vstem |
2038 | case 0x12: // hstemhm |
2039 | case 0x17: // vstemhm |
2040 | maskbits += (sp / 2); |
2041 | break; |
2042 | |
2043 | case 0x15: // rmoveto |
2044 | in_header = 0; |
2045 | if (sp < 2) return STBTT__CSERR("rmoveto stack"); |
2046 | stbtt__csctx_rmove_to(c, s[sp-2], s[sp-1]); |
2047 | break; |
2048 | case 0x04: // vmoveto |
2049 | in_header = 0; |
2050 | if (sp < 1) return STBTT__CSERR("vmoveto stack"); |
2051 | stbtt__csctx_rmove_to(c, 0, s[sp-1]); |
2052 | break; |
2053 | case 0x16: // hmoveto |
2054 | in_header = 0; |
2055 | if (sp < 1) return STBTT__CSERR("hmoveto stack"); |
2056 | stbtt__csctx_rmove_to(c, s[sp-1], 0); |
2057 | break; |
2058 | |
2059 | case 0x05: // rlineto |
2060 | if (sp < 2) return STBTT__CSERR("rlineto stack"); |
2061 | for (; i + 1 < sp; i += 2) |
2062 | stbtt__csctx_rline_to(c, s[i], s[i+1]); |
2063 | break; |
2064 | |
2065 | // hlineto/vlineto and vhcurveto/hvcurveto alternate horizontal and vertical |
2066 | // starting from a different place. |
2067 | |
2068 | case 0x07: // vlineto |
2069 | if (sp < 1) return STBTT__CSERR("vlineto stack"); |
2070 | goto vlineto; |
2071 | case 0x06: // hlineto |
2072 | if (sp < 1) return STBTT__CSERR("hlineto stack"); |
2073 | for (;;) { |
2074 | if (i >= sp) break; |
2075 | stbtt__csctx_rline_to(c, s[i], 0); |
2076 | i++; |
2077 | vlineto: |
2078 | if (i >= sp) break; |
2079 | stbtt__csctx_rline_to(c, 0, s[i]); |
2080 | i++; |
2081 | } |
2082 | break; |
2083 | |
2084 | case 0x1F: // hvcurveto |
2085 | if (sp < 4) return STBTT__CSERR("hvcurveto stack"); |
2086 | goto hvcurveto; |
2087 | case 0x1E: // vhcurveto |
2088 | if (sp < 4) return STBTT__CSERR("vhcurveto stack"); |
2089 | for (;;) { |
2090 | if (i + 3 >= sp) break; |
2091 | stbtt__csctx_rccurve_to(c, 0, s[i], s[i+1], s[i+2], s[i+3], (sp - i == 5) ? s[i + 4] : 0.0f); |
2092 | i += 4; |
2093 | hvcurveto: |
2094 | if (i + 3 >= sp) break; |
2095 | stbtt__csctx_rccurve_to(c, s[i], 0, s[i+1], s[i+2], (sp - i == 5) ? s[i+4] : 0.0f, s[i+3]); |
2096 | i += 4; |
2097 | } |
2098 | break; |
2099 | |
2100 | case 0x08: // rrcurveto |
2101 | if (sp < 6) return STBTT__CSERR("rcurveline stack"); |
2102 | for (; i + 5 < sp; i += 6) |
2103 | stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]); |
2104 | break; |
2105 | |
2106 | case 0x18: // rcurveline |
2107 | if (sp < 8) return STBTT__CSERR("rcurveline stack"); |
2108 | for (; i + 5 < sp - 2; i += 6) |
2109 | stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]); |
2110 | if (i + 1 >= sp) return STBTT__CSERR("rcurveline stack"); |
2111 | stbtt__csctx_rline_to(c, s[i], s[i+1]); |
2112 | break; |
2113 | |
2114 | case 0x19: // rlinecurve |
2115 | if (sp < 8) return STBTT__CSERR("rlinecurve stack"); |
2116 | for (; i + 1 < sp - 6; i += 2) |
2117 | stbtt__csctx_rline_to(c, s[i], s[i+1]); |
2118 | if (i + 5 >= sp) return STBTT__CSERR("rlinecurve stack"); |
2119 | stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]); |
2120 | break; |
2121 | |
2122 | case 0x1A: // vvcurveto |
2123 | case 0x1B: // hhcurveto |
2124 | if (sp < 4) return STBTT__CSERR("(vv|hh)curveto stack"); |
2125 | f = 0.0; |
2126 | if (sp & 1) { f = s[i]; i++; } |
2127 | for (; i + 3 < sp; i += 4) { |
2128 | if (b0 == 0x1B) |
2129 | stbtt__csctx_rccurve_to(c, s[i], f, s[i+1], s[i+2], s[i+3], 0.0); |
2130 | else |
2131 | stbtt__csctx_rccurve_to(c, f, s[i], s[i+1], s[i+2], 0.0, s[i+3]); |
2132 | f = 0.0; |
2133 | } |
2134 | break; |
2135 | |
2136 | case 0x0A: // callsubr |
2137 | if (!has_subrs) { |
2138 | if (info->fdselect.size) |
2139 | subrs = stbtt__cid_get_glyph_subrs(info, glyph_index); |
2140 | has_subrs = 1; |
2141 | } |
2142 | // FALLTHROUGH |
2143 | case 0x1D: // callgsubr |
2144 | if (sp < 1) return STBTT__CSERR("call(g|)subr stack"); |
2145 | v = (int) s[--sp]; |
2146 | if (subr_stack_height >= 10) return STBTT__CSERR("recursion limit"); |
2147 | subr_stack[subr_stack_height++] = b; |
2148 | b = stbtt__get_subr(b0 == 0x0A ? subrs : info->gsubrs, v); |
2149 | if (b.size == 0) return STBTT__CSERR("subr not found"); |
2150 | b.cursor = 0; |
2151 | clear_stack = 0; |
2152 | break; |
2153 | |
2154 | case 0x0B: // return |
2155 | if (subr_stack_height <= 0) return STBTT__CSERR("return outside subr"); |
2156 | b = subr_stack[--subr_stack_height]; |
2157 | clear_stack = 0; |
2158 | break; |
2159 | |
2160 | case 0x0E: // endchar |
2161 | stbtt__csctx_close_shape(c); |
2162 | return 1; |
2163 | |
2164 | case 0x0C: { // two-byte escape |
2165 | float dx1, dx2, dx3, dx4, dx5, dx6, dy1, dy2, dy3, dy4, dy5, dy6; |
2166 | float dx, dy; |
2167 | int b1 = stbtt__buf_get8(&b); |
2168 | switch (b1) { |
2169 | // @TODO These "flex" implementations ignore the flex-depth and resolution, |
2170 | // and always draw beziers. |
2171 | case 0x22: // hflex |
2172 | if (sp < 7) return STBTT__CSERR("hflex stack"); |
2173 | dx1 = s[0]; |
2174 | dx2 = s[1]; |
2175 | dy2 = s[2]; |
2176 | dx3 = s[3]; |
2177 | dx4 = s[4]; |
2178 | dx5 = s[5]; |
2179 | dx6 = s[6]; |
2180 | stbtt__csctx_rccurve_to(c, dx1, 0, dx2, dy2, dx3, 0); |
2181 | stbtt__csctx_rccurve_to(c, dx4, 0, dx5, -dy2, dx6, 0); |
2182 | break; |
2183 | |
2184 | case 0x23: // flex |
2185 | if (sp < 13) return STBTT__CSERR("flex stack"); |
2186 | dx1 = s[0]; |
2187 | dy1 = s[1]; |
2188 | dx2 = s[2]; |
2189 | dy2 = s[3]; |
2190 | dx3 = s[4]; |
2191 | dy3 = s[5]; |
2192 | dx4 = s[6]; |
2193 | dy4 = s[7]; |
2194 | dx5 = s[8]; |
2195 | dy5 = s[9]; |
2196 | dx6 = s[10]; |
2197 | dy6 = s[11]; |
2198 | //fd is s[12] |
2199 | stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3); |
2200 | stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6); |
2201 | break; |
2202 | |
2203 | case 0x24: // hflex1 |
2204 | if (sp < 9) return STBTT__CSERR("hflex1 stack"); |
2205 | dx1 = s[0]; |
2206 | dy1 = s[1]; |
2207 | dx2 = s[2]; |
2208 | dy2 = s[3]; |
2209 | dx3 = s[4]; |
2210 | dx4 = s[5]; |
2211 | dx5 = s[6]; |
2212 | dy5 = s[7]; |
2213 | dx6 = s[8]; |
2214 | stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, 0); |
2215 | stbtt__csctx_rccurve_to(c, dx4, 0, dx5, dy5, dx6, -(dy1+dy2+dy5)); |
2216 | break; |
2217 | |
2218 | case 0x25: // flex1 |
2219 | if (sp < 11) return STBTT__CSERR("flex1 stack"); |
2220 | dx1 = s[0]; |
2221 | dy1 = s[1]; |
2222 | dx2 = s[2]; |
2223 | dy2 = s[3]; |
2224 | dx3 = s[4]; |
2225 | dy3 = s[5]; |
2226 | dx4 = s[6]; |
2227 | dy4 = s[7]; |
2228 | dx5 = s[8]; |
2229 | dy5 = s[9]; |
2230 | dx6 = dy6 = s[10]; |
2231 | dx = dx1+dx2+dx3+dx4+dx5; |
2232 | dy = dy1+dy2+dy3+dy4+dy5; |
2233 | if (STBTT_fabs(dx) > STBTT_fabs(dy)) |
2234 | dy6 = -dy; |
2235 | else |
2236 | dx6 = -dx; |
2237 | stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3); |
2238 | stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6); |
2239 | break; |
2240 | |
2241 | default: |
2242 | return STBTT__CSERR("unimplemented"); |
2243 | } |
2244 | } break; |
2245 | |
2246 | default: |
2247 | if (b0 != 255 && b0 != 28 && b0 < 32) |
2248 | return STBTT__CSERR("reserved operator"); |
2249 | |
2250 | // push immediate |
2251 | if (b0 == 255) { |
2252 | f = (float)(stbtt_int32)stbtt__buf_get32(&b) / 0x10000; |
2253 | } else { |
2254 | stbtt__buf_skip(&b, -1); |
2255 | f = (float)(stbtt_int16)stbtt__cff_int(&b); |
2256 | } |
2257 | if (sp >= 48) return STBTT__CSERR("push stack overflow"); |
2258 | s[sp++] = f; |
2259 | clear_stack = 0; |
2260 | break; |
2261 | } |
2262 | if (clear_stack) sp = 0; |
2263 | } |
2264 | return STBTT__CSERR("no endchar"); |
2265 | |
2266 | #undef STBTT__CSERR |
2267 | } |
2268 | |
2269 | static int stbtt__GetGlyphShapeT2(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) |
2270 | { |
2271 | // runs the charstring twice, once to count and once to output (to avoid realloc) |
2272 | stbtt__csctx count_ctx = STBTT__CSCTX_INIT(1); |
2273 | stbtt__csctx output_ctx = STBTT__CSCTX_INIT(0); |
2274 | if (stbtt__run_charstring(info, glyph_index, &count_ctx)) { |
2275 | *pvertices = (stbtt_vertex*)STBTT_malloc(count_ctx.num_vertices*sizeof(stbtt_vertex), info->userdata); |
2276 | output_ctx.pvertices = *pvertices; |
2277 | if (stbtt__run_charstring(info, glyph_index, &output_ctx)) { |
2278 | STBTT_assert(output_ctx.num_vertices == count_ctx.num_vertices); |
2279 | return output_ctx.num_vertices; |
2280 | } |
2281 | } |
2282 | *pvertices = NULL; |
2283 | return 0; |
2284 | } |
2285 | |
2286 | static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1) |
2287 | { |
2288 | stbtt__csctx c = STBTT__CSCTX_INIT(1); |
2289 | int r = stbtt__run_charstring(info, glyph_index, &c); |
2290 | if (x0) *x0 = r ? c.min_x : 0; |
2291 | if (y0) *y0 = r ? c.min_y : 0; |
2292 | if (x1) *x1 = r ? c.max_x : 0; |
2293 | if (y1) *y1 = r ? c.max_y : 0; |
2294 | return r ? c.num_vertices : 0; |
2295 | } |
2296 | |
2297 | STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) |
2298 | { |
2299 | if (!info->cff.size) |
2300 | return stbtt__GetGlyphShapeTT(info, glyph_index, pvertices); |
2301 | else |
2302 | return stbtt__GetGlyphShapeT2(info, glyph_index, pvertices); |
2303 | } |
2304 | |
2305 | STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing) |
2306 | { |
2307 | stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34); |
2308 | if (glyph_index < numOfLongHorMetrics) { |
2309 | if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*glyph_index); |
2310 | if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2); |
2311 | } else { |
2312 | if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1)); |
2313 | if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics)); |
2314 | } |
2315 | } |
2316 | |
2317 | STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info) |
2318 | { |
2319 | stbtt_uint8 *data = info->data + info->kern; |
2320 | |
2321 | // we only look at the first table. it must be 'horizontal' and format 0. |
2322 | if (!info->kern) |
2323 | return 0; |
2324 | if (ttUSHORT(data+2) < 1) // number of tables, need at least 1 |
2325 | return 0; |
2326 | if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format |
2327 | return 0; |
2328 | |
2329 | return ttUSHORT(data+10); |
2330 | } |
2331 | |
2332 | STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length) |
2333 | { |
2334 | stbtt_uint8 *data = info->data + info->kern; |
2335 | int k, length; |
2336 | |
2337 | // we only look at the first table. it must be 'horizontal' and format 0. |
2338 | if (!info->kern) |
2339 | return 0; |
2340 | if (ttUSHORT(data+2) < 1) // number of tables, need at least 1 |
2341 | return 0; |
2342 | if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format |
2343 | return 0; |
2344 | |
2345 | length = ttUSHORT(data+10); |
2346 | if (table_length < length) |
2347 | length = table_length; |
2348 | |
2349 | for (k = 0; k < length; k++) |
2350 | { |
2351 | table[k].glyph1 = ttUSHORT(data+18+(k*6)); |
2352 | table[k].glyph2 = ttUSHORT(data+20+(k*6)); |
2353 | table[k].advance = ttSHORT(data+22+(k*6)); |
2354 | } |
2355 | |
2356 | return length; |
2357 | } |
2358 | |
2359 | static int stbtt__GetGlyphKernInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2) |
2360 | { |
2361 | stbtt_uint8 *data = info->data + info->kern; |
2362 | stbtt_uint32 needle, straw; |
2363 | int l, r, m; |
2364 | |
2365 | // we only look at the first table. it must be 'horizontal' and format 0. |
2366 | if (!info->kern) |
2367 | return 0; |
2368 | if (ttUSHORT(data+2) < 1) // number of tables, need at least 1 |
2369 | return 0; |
2370 | if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format |
2371 | return 0; |
2372 | |
2373 | l = 0; |
2374 | r = ttUSHORT(data+10) - 1; |
2375 | needle = glyph1 << 16 | glyph2; |
2376 | while (l <= r) { |
2377 | m = (l + r) >> 1; |
2378 | straw = ttULONG(data+18+(m*6)); // note: unaligned read |
2379 | if (needle < straw) |
2380 | r = m - 1; |
2381 | else if (needle > straw) |
2382 | l = m + 1; |
2383 | else |
2384 | return ttSHORT(data+22+(m*6)); |
2385 | } |
2386 | return 0; |
2387 | } |
2388 | |
2389 | static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyph) |
2390 | { |
2391 | stbtt_uint16 coverageFormat = ttUSHORT(coverageTable); |
2392 | switch (coverageFormat) { |
2393 | case 1: { |
2394 | stbtt_uint16 glyphCount = ttUSHORT(coverageTable + 2); |
2395 | |
2396 | // Binary search. |
2397 | stbtt_int32 l=0, r=glyphCount-1, m; |
2398 | int straw, needle=glyph; |
2399 | while (l <= r) { |
2400 | stbtt_uint8 *glyphArray = coverageTable + 4; |
2401 | stbtt_uint16 glyphID; |
2402 | m = (l + r) >> 1; |
2403 | glyphID = ttUSHORT(glyphArray + 2 * m); |
2404 | straw = glyphID; |
2405 | if (needle < straw) |
2406 | r = m - 1; |
2407 | else if (needle > straw) |
2408 | l = m + 1; |
2409 | else { |
2410 | return m; |
2411 | } |
2412 | } |
2413 | break; |
2414 | } |
2415 | |
2416 | case 2: { |
2417 | stbtt_uint16 rangeCount = ttUSHORT(coverageTable + 2); |
2418 | stbtt_uint8 *rangeArray = coverageTable + 4; |
2419 | |
2420 | // Binary search. |
2421 | stbtt_int32 l=0, r=rangeCount-1, m; |
2422 | int strawStart, strawEnd, needle=glyph; |
2423 | while (l <= r) { |
2424 | stbtt_uint8 *rangeRecord; |
2425 | m = (l + r) >> 1; |
2426 | rangeRecord = rangeArray + 6 * m; |
2427 | strawStart = ttUSHORT(rangeRecord); |
2428 | strawEnd = ttUSHORT(rangeRecord + 2); |
2429 | if (needle < strawStart) |
2430 | r = m - 1; |
2431 | else if (needle > strawEnd) |
2432 | l = m + 1; |
2433 | else { |
2434 | stbtt_uint16 startCoverageIndex = ttUSHORT(rangeRecord + 4); |
2435 | return startCoverageIndex + glyph - strawStart; |
2436 | } |
2437 | } |
2438 | break; |
2439 | } |
2440 | |
2441 | default: return -1; // unsupported |
2442 | } |
2443 | |
2444 | return -1; |
2445 | } |
2446 | |
2447 | static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph) |
2448 | { |
2449 | stbtt_uint16 classDefFormat = ttUSHORT(classDefTable); |
2450 | switch (classDefFormat) |
2451 | { |
2452 | case 1: { |
2453 | stbtt_uint16 startGlyphID = ttUSHORT(classDefTable + 2); |
2454 | stbtt_uint16 glyphCount = ttUSHORT(classDefTable + 4); |
2455 | stbtt_uint8 *classDef1ValueArray = classDefTable + 6; |
2456 | |
2457 | if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount) |
2458 | return (stbtt_int32)ttUSHORT(classDef1ValueArray + 2 * (glyph - startGlyphID)); |
2459 | break; |
2460 | } |
2461 | |
2462 | case 2: { |
2463 | stbtt_uint16 classRangeCount = ttUSHORT(classDefTable + 2); |
2464 | stbtt_uint8 *classRangeRecords = classDefTable + 4; |
2465 | |
2466 | // Binary search. |
2467 | stbtt_int32 l=0, r=classRangeCount-1, m; |
2468 | int strawStart, strawEnd, needle=glyph; |
2469 | while (l <= r) { |
2470 | stbtt_uint8 *classRangeRecord; |
2471 | m = (l + r) >> 1; |
2472 | classRangeRecord = classRangeRecords + 6 * m; |
2473 | strawStart = ttUSHORT(classRangeRecord); |
2474 | strawEnd = ttUSHORT(classRangeRecord + 2); |
2475 | if (needle < strawStart) |
2476 | r = m - 1; |
2477 | else if (needle > strawEnd) |
2478 | l = m + 1; |
2479 | else |
2480 | return (stbtt_int32)ttUSHORT(classRangeRecord + 4); |
2481 | } |
2482 | break; |
2483 | } |
2484 | |
2485 | default: |
2486 | return -1; // Unsupported definition type, return an error. |
2487 | } |
2488 | |
2489 | // "All glyphs not assigned to a class fall into class 0". (OpenType spec) |
2490 | return 0; |
2491 | } |
2492 | |
2493 | // Define to STBTT_assert(x) if you want to break on unimplemented formats. |
2494 | #define STBTT_GPOS_TODO_assert(x) |
2495 | |
2496 | static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2) |
2497 | { |
2498 | stbtt_uint16 lookupListOffset; |
2499 | stbtt_uint8 *lookupList; |
2500 | stbtt_uint16 lookupCount; |
2501 | stbtt_uint8 *data; |
2502 | stbtt_int32 i, sti; |
2503 | |
2504 | if (!info->gpos) return 0; |
2505 | |
2506 | data = info->data + info->gpos; |
2507 | |
2508 | if (ttUSHORT(data+0) != 1) return 0; // Major version 1 |
2509 | if (ttUSHORT(data+2) != 0) return 0; // Minor version 0 |
2510 | |
2511 | lookupListOffset = ttUSHORT(data+8); |
2512 | lookupList = data + lookupListOffset; |
2513 | lookupCount = ttUSHORT(lookupList); |
2514 | |
2515 | for (i=0; i<lookupCount; ++i) { |
2516 | stbtt_uint16 lookupOffset = ttUSHORT(lookupList + 2 + 2 * i); |
2517 | stbtt_uint8 *lookupTable = lookupList + lookupOffset; |
2518 | |
2519 | stbtt_uint16 lookupType = ttUSHORT(lookupTable); |
2520 | stbtt_uint16 subTableCount = ttUSHORT(lookupTable + 4); |
2521 | stbtt_uint8 *subTableOffsets = lookupTable + 6; |
2522 | if (lookupType != 2) // Pair Adjustment Positioning Subtable |
2523 | continue; |
2524 | |
2525 | for (sti=0; sti<subTableCount; sti++) { |
2526 | stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2 * sti); |
2527 | stbtt_uint8 *table = lookupTable + subtableOffset; |
2528 | stbtt_uint16 posFormat = ttUSHORT(table); |
2529 | stbtt_uint16 coverageOffset = ttUSHORT(table + 2); |
2530 | stbtt_int32 coverageIndex = stbtt__GetCoverageIndex(table + coverageOffset, glyph1); |
2531 | if (coverageIndex == -1) continue; |
2532 | |
2533 | switch (posFormat) { |
2534 | case 1: { |
2535 | stbtt_int32 l, r, m; |
2536 | int straw, needle; |
2537 | stbtt_uint16 valueFormat1 = ttUSHORT(table + 4); |
2538 | stbtt_uint16 valueFormat2 = ttUSHORT(table + 6); |
2539 | if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats? |
2540 | stbtt_int32 valueRecordPairSizeInBytes = 2; |
2541 | stbtt_uint16 pairSetCount = ttUSHORT(table + 8); |
2542 | stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex); |
2543 | stbtt_uint8 *pairValueTable = table + pairPosOffset; |
2544 | stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable); |
2545 | stbtt_uint8 *pairValueArray = pairValueTable + 2; |
2546 | |
2547 | if (coverageIndex >= pairSetCount) return 0; |
2548 | |
2549 | needle=glyph2; |
2550 | r=pairValueCount-1; |
2551 | l=0; |
2552 | |
2553 | // Binary search. |
2554 | while (l <= r) { |
2555 | stbtt_uint16 secondGlyph; |
2556 | stbtt_uint8 *pairValue; |
2557 | m = (l + r) >> 1; |
2558 | pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m; |
2559 | secondGlyph = ttUSHORT(pairValue); |
2560 | straw = secondGlyph; |
2561 | if (needle < straw) |
2562 | r = m - 1; |
2563 | else if (needle > straw) |
2564 | l = m + 1; |
2565 | else { |
2566 | stbtt_int16 xAdvance = ttSHORT(pairValue + 2); |
2567 | return xAdvance; |
2568 | } |
2569 | } |
2570 | } else |
2571 | return 0; |
2572 | break; |
2573 | } |
2574 | |
2575 | case 2: { |
2576 | stbtt_uint16 valueFormat1 = ttUSHORT(table + 4); |
2577 | stbtt_uint16 valueFormat2 = ttUSHORT(table + 6); |
2578 | if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats? |
2579 | stbtt_uint16 classDef1Offset = ttUSHORT(table + 8); |
2580 | stbtt_uint16 classDef2Offset = ttUSHORT(table + 10); |
2581 | int glyph1class = stbtt__GetGlyphClass(table + classDef1Offset, glyph1); |
2582 | int glyph2class = stbtt__GetGlyphClass(table + classDef2Offset, glyph2); |
2583 | |
2584 | stbtt_uint16 class1Count = ttUSHORT(table + 12); |
2585 | stbtt_uint16 class2Count = ttUSHORT(table + 14); |
2586 | stbtt_uint8 *class1Records, *class2Records; |
2587 | stbtt_int16 xAdvance; |
2588 | |
2589 | if (glyph1class < 0 || glyph1class >= class1Count) return 0; // malformed |
2590 | if (glyph2class < 0 || glyph2class >= class2Count) return 0; // malformed |
2591 | |
2592 | class1Records = table + 16; |
2593 | class2Records = class1Records + 2 * (glyph1class * class2Count); |
2594 | xAdvance = ttSHORT(class2Records + 2 * glyph2class); |
2595 | return xAdvance; |
2596 | } else |
2597 | return 0; |
2598 | break; |
2599 | } |
2600 | |
2601 | default: |
2602 | return 0; // Unsupported position format |
2603 | } |
2604 | } |
2605 | } |
2606 | |
2607 | return 0; |
2608 | } |
2609 | |
2610 | STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1, int g2) |
2611 | { |
2612 | int xAdvance = 0; |
2613 | |
2614 | if (info->gpos) |
2615 | xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, g1, g2); |
2616 | else if (info->kern) |
2617 | xAdvance += stbtt__GetGlyphKernInfoAdvance(info, g1, g2); |
2618 | |
2619 | return xAdvance; |
2620 | } |
2621 | |
2622 | STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2) |
2623 | { |
2624 | if (!info->kern && !info->gpos) // if no kerning table, don't waste time looking up both codepoint->glyphs |
2625 | return 0; |
2626 | return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2)); |
2627 | } |
2628 | |
2629 | STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing) |
2630 | { |
2631 | stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing); |
2632 | } |
2633 | |
2634 | STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap) |
2635 | { |
2636 | if (ascent ) *ascent = ttSHORT(info->data+info->hhea + 4); |
2637 | if (descent) *descent = ttSHORT(info->data+info->hhea + 6); |
2638 | if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8); |
2639 | } |
2640 | |
2641 | STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap) |
2642 | { |
2643 | int tab = stbtt__find_table(info->data, info->fontstart, "OS/2"); |
2644 | if (!tab) |
2645 | return 0; |
2646 | if (typoAscent ) *typoAscent = ttSHORT(info->data+tab + 68); |
2647 | if (typoDescent) *typoDescent = ttSHORT(info->data+tab + 70); |
2648 | if (typoLineGap) *typoLineGap = ttSHORT(info->data+tab + 72); |
2649 | return 1; |
2650 | } |
2651 | |
2652 | STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1) |
2653 | { |
2654 | *x0 = ttSHORT(info->data + info->head + 36); |
2655 | *y0 = ttSHORT(info->data + info->head + 38); |
2656 | *x1 = ttSHORT(info->data + info->head + 40); |
2657 | *y1 = ttSHORT(info->data + info->head + 42); |
2658 | } |
2659 | |
2660 | STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height) |
2661 | { |
2662 | int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6); |
2663 | return (float) height / fheight; |
2664 | } |
2665 | |
2666 | STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels) |
2667 | { |
2668 | int unitsPerEm = ttUSHORT(info->data + info->head + 18); |
2669 | return pixels / unitsPerEm; |
2670 | } |
2671 | |
2672 | STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v) |
2673 | { |
2674 | STBTT_free(v, info->userdata); |
2675 | } |
2676 | |
2677 | STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl) |
2678 | { |
2679 | int i; |
2680 | stbtt_uint8 *data = info->data; |
2681 | stbtt_uint8 *svg_doc_list = data + stbtt__get_svg((stbtt_fontinfo *) info); |
2682 | |
2683 | int numEntries = ttUSHORT(svg_doc_list); |
2684 | stbtt_uint8 *svg_docs = svg_doc_list + 2; |
2685 | |
2686 | for(i=0; i<numEntries; i++) { |
2687 | stbtt_uint8 *svg_doc = svg_docs + (12 * i); |
2688 | if ((gl >= ttUSHORT(svg_doc)) && (gl <= ttUSHORT(svg_doc + 2))) |
2689 | return svg_doc; |
2690 | } |
2691 | return 0; |
2692 | } |
2693 | |
2694 | STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg) |
2695 | { |
2696 | stbtt_uint8 *data = info->data; |
2697 | stbtt_uint8 *svg_doc; |
2698 | |
2699 | if (info->svg == 0) |
2700 | return 0; |
2701 | |
2702 | svg_doc = stbtt_FindSVGDoc(info, gl); |
2703 | if (svg_doc != NULL) { |
2704 | *svg = (char *) data + info->svg + ttULONG(svg_doc + 4); |
2705 | return ttULONG(svg_doc + 8); |
2706 | } else { |
2707 | return 0; |
2708 | } |
2709 | } |
2710 | |
2711 | STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg) |
2712 | { |
2713 | return stbtt_GetGlyphSVG(info, stbtt_FindGlyphIndex(info, unicode_codepoint), svg); |
2714 | } |
2715 | |
2716 | ////////////////////////////////////////////////////////////////////////////// |
2717 | // |
2718 | // antialiasing software rasterizer |
2719 | // |
2720 | |
2721 | 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) |
2722 | { |
2723 | int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning |
2724 | if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) { |
2725 | // e.g. space character |
2726 | if (ix0) *ix0 = 0; |
2727 | if (iy0) *iy0 = 0; |
2728 | if (ix1) *ix1 = 0; |
2729 | if (iy1) *iy1 = 0; |
2730 | } else { |
2731 | // move to integral bboxes (treating pixels as little squares, what pixels get touched)? |
2732 | if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x); |
2733 | if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y); |
2734 | if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x); |
2735 | if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y); |
2736 | } |
2737 | } |
2738 | |
2739 | 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) |
2740 | { |
2741 | stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1); |
2742 | } |
2743 | |
2744 | 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) |
2745 | { |
2746 | stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1); |
2747 | } |
2748 | |
2749 | 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) |
2750 | { |
2751 | stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1); |
2752 | } |
2753 | |
2754 | ////////////////////////////////////////////////////////////////////////////// |
2755 | // |
2756 | // Rasterizer |
2757 | |
2758 | typedef struct stbtt__hheap_chunk |
2759 | { |
2760 | struct stbtt__hheap_chunk *next; |
2761 | } stbtt__hheap_chunk; |
2762 | |
2763 | typedef struct stbtt__hheap |
2764 | { |
2765 | struct stbtt__hheap_chunk *head; |
2766 | void *first_free; |
2767 | int num_remaining_in_head_chunk; |
2768 | } stbtt__hheap; |
2769 | |
2770 | static void *stbtt__hheap_alloc(stbtt__hheap *hh, size_t size, void *userdata) |
2771 | { |
2772 | if (hh->first_free) { |
2773 | void *p = hh->first_free; |
2774 | hh->first_free = * (void **) p; |
2775 | return p; |
2776 | } else { |
2777 | if (hh->num_remaining_in_head_chunk == 0) { |
2778 | int count = (size < 32 ? 2000 : size < 128 ? 800 : 100); |
2779 | stbtt__hheap_chunk *c = (stbtt__hheap_chunk *) STBTT_malloc(sizeof(stbtt__hheap_chunk) + size * count, userdata); |
2780 | if (c == NULL) |
2781 | return NULL; |
2782 | c->next = hh->head; |
2783 | hh->head = c; |
2784 | hh->num_remaining_in_head_chunk = count; |
2785 | } |
2786 | --hh->num_remaining_in_head_chunk; |
2787 | return (char *) (hh->head) + sizeof(stbtt__hheap_chunk) + size * hh->num_remaining_in_head_chunk; |
2788 | } |
2789 | } |
2790 | |
2791 | static void stbtt__hheap_free(stbtt__hheap *hh, void *p) |
2792 | { |
2793 | *(void **) p = hh->first_free; |
2794 | hh->first_free = p; |
2795 | } |
2796 | |
2797 | static void stbtt__hheap_cleanup(stbtt__hheap *hh, void *userdata) |
2798 | { |
2799 | stbtt__hheap_chunk *c = hh->head; |
2800 | while (c) { |
2801 | stbtt__hheap_chunk *n = c->next; |
2802 | STBTT_free(c, userdata); |
2803 | c = n; |
2804 | } |
2805 | } |
2806 | |
2807 | typedef struct stbtt__edge { |
2808 | float x0,y0, x1,y1; |
2809 | int invert; |
2810 | } stbtt__edge; |
2811 | |
2812 | |
2813 | typedef struct stbtt__active_edge |
2814 | { |
2815 | struct stbtt__active_edge *next; |
2816 | #if STBTT_RASTERIZER_VERSION==1 |
2817 | int x,dx; |
2818 | float ey; |
2819 | int direction; |
2820 | #elif STBTT_RASTERIZER_VERSION==2 |
2821 | float fx,fdx,fdy; |
2822 | float direction; |
2823 | float sy; |
2824 | float ey; |
2825 | #else |
2826 | #error "Unrecognized value of STBTT_RASTERIZER_VERSION" |
2827 | #endif |
2828 | } stbtt__active_edge; |
2829 | |
2830 | #if STBTT_RASTERIZER_VERSION == 1 |
2831 | #define STBTT_FIXSHIFT 10 |
2832 | #define STBTT_FIX (1 << STBTT_FIXSHIFT) |
2833 | #define STBTT_FIXMASK (STBTT_FIX-1) |
2834 | |
2835 | static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata) |
2836 | { |
2837 | stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata); |
2838 | float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0); |
2839 | STBTT_assert(z != NULL); |
2840 | if (!z) return z; |
2841 | |
2842 | // round dx down to avoid overshooting |
2843 | if (dxdy < 0) |
2844 | z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy); |
2845 | else |
2846 | z->dx = STBTT_ifloor(STBTT_FIX * dxdy); |
2847 | |
2848 | 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 |
2849 | z->x -= off_x * STBTT_FIX; |
2850 | |
2851 | z->ey = e->y1; |
2852 | z->next = 0; |
2853 | z->direction = e->invert ? 1 : -1; |
2854 | return z; |
2855 | } |
2856 | #elif STBTT_RASTERIZER_VERSION == 2 |
2857 | static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata) |
2858 | { |
2859 | stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata); |
2860 | float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0); |
2861 | STBTT_assert(z != NULL); |
2862 | //STBTT_assert(e->y0 <= start_point); |
2863 | if (!z) return z; |
2864 | z->fdx = dxdy; |
2865 | z->fdy = dxdy != 0.0f ? (1.0f/dxdy) : 0.0f; |
2866 | z->fx = e->x0 + dxdy * (start_point - e->y0); |
2867 | z->fx -= off_x; |
2868 | z->direction = e->invert ? 1.0f : -1.0f; |
2869 | z->sy = e->y0; |
2870 | z->ey = e->y1; |
2871 | z->next = 0; |
2872 | return z; |
2873 | } |
2874 | #else |
2875 | #error "Unrecognized value of STBTT_RASTERIZER_VERSION" |
2876 | #endif |
2877 | |
2878 | #if STBTT_RASTERIZER_VERSION == 1 |
2879 | // note: this routine clips fills that extend off the edges... ideally this |
2880 | // wouldn't happen, but it could happen if the truetype glyph bounding boxes |
2881 | // are wrong, or if the user supplies a too-small bitmap |
2882 | static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight) |
2883 | { |
2884 | // non-zero winding fill |
2885 | int x0=0, w=0; |
2886 | |
2887 | while (e) { |
2888 | if (w == 0) { |
2889 | // if we're currently at zero, we need to record the edge start point |
2890 | x0 = e->x; w += e->direction; |
2891 | } else { |
2892 | int x1 = e->x; w += e->direction; |
2893 | // if we went to zero, we need to draw |
2894 | if (w == 0) { |
2895 | int i = x0 >> STBTT_FIXSHIFT; |
2896 | int j = x1 >> STBTT_FIXSHIFT; |
2897 | |
2898 | if (i < len && j >= 0) { |
2899 | if (i == j) { |
2900 | // x0,x1 are the same pixel, so compute combined coverage |
2901 | scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> STBTT_FIXSHIFT); |
2902 | } else { |
2903 | if (i >= 0) // add antialiasing for x0 |
2904 | scanline[i] = scanline[i] + (stbtt_uint8) (((STBTT_FIX - (x0 & STBTT_FIXMASK)) * max_weight) >> STBTT_FIXSHIFT); |
2905 | else |
2906 | i = -1; // clip |
2907 | |
2908 | if (j < len) // add antialiasing for x1 |
2909 | scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & STBTT_FIXMASK) * max_weight) >> STBTT_FIXSHIFT); |
2910 | else |
2911 | j = len; // clip |
2912 | |
2913 | for (++i; i < j; ++i) // fill pixels between x0 and x1 |
2914 | scanline[i] = scanline[i] + (stbtt_uint8) max_weight; |
2915 | } |
2916 | } |
2917 | } |
2918 | } |
2919 | |
2920 | e = e->next; |
2921 | } |
2922 | } |
2923 | |
2924 | static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata) |
2925 | { |
2926 | stbtt__hheap hh = { 0, 0, 0 }; |
2927 | stbtt__active_edge *active = NULL; |
2928 | int y,j=0; |
2929 | int max_weight = (255 / vsubsample); // weight per vertical scanline |
2930 | int s; // vertical subsample index |
2931 | unsigned char scanline_data[512], *scanline; |
2932 | |
2933 | if (result->w > 512) |
2934 | scanline = (unsigned char *) STBTT_malloc(result->w, userdata); |
2935 | else |
2936 | scanline = scanline_data; |
2937 | |
2938 | y = off_y * vsubsample; |
2939 | e[n].y0 = (off_y + result->h) * (float) vsubsample + 1; |
2940 | |
2941 | while (j < result->h) { |
2942 | STBTT_memset(scanline, 0, result->w); |
2943 | for (s=0; s < vsubsample; ++s) { |
2944 | // find center of pixel for this scanline |
2945 | float scan_y = y + 0.5f; |
2946 | stbtt__active_edge **step = &active; |
2947 | |
2948 | // update all active edges; |
2949 | // remove all active edges that terminate before the center of this scanline |
2950 | while (*step) { |
2951 | stbtt__active_edge * z = *step; |
2952 | if (z->ey <= scan_y) { |
2953 | *step = z->next; // delete from list |
2954 | STBTT_assert(z->direction); |
2955 | z->direction = 0; |
2956 | stbtt__hheap_free(&hh, z); |
2957 | } else { |
2958 | z->x += z->dx; // advance to position for current scanline |
2959 | step = &((*step)->next); // advance through list |
2960 | } |
2961 | } |
2962 | |
2963 | // resort the list if needed |
2964 | for(;;) { |
2965 | int changed=0; |
2966 | step = &active; |
2967 | while (*step && (*step)->next) { |
2968 | if ((*step)->x > (*step)->next->x) { |
2969 | stbtt__active_edge *t = *step; |
2970 | stbtt__active_edge *q = t->next; |
2971 | |
2972 | t->next = q->next; |
2973 | q->next = t; |
2974 | *step = q; |
2975 | changed = 1; |
2976 | } |
2977 | step = &(*step)->next; |
2978 | } |
2979 | if (!changed) break; |
2980 | } |
2981 | |
2982 | // insert all edges that start before the center of this scanline -- omit ones that also end on this scanline |
2983 | while (e->y0 <= scan_y) { |
2984 | if (e->y1 > scan_y) { |
2985 | stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata); |
2986 | if (z != NULL) { |
2987 | // find insertion point |
2988 | if (active == NULL) |
2989 | active = z; |
2990 | else if (z->x < active->x) { |
2991 | // insert at front |
2992 | z->next = active; |
2993 | active = z; |
2994 | } else { |
2995 | // find thing to insert AFTER |
2996 | stbtt__active_edge *p = active; |
2997 | while (p->next && p->next->x < z->x) |
2998 | p = p->next; |
2999 | // at this point, p->next->x is NOT < z->x |
3000 | z->next = p->next; |
3001 | p->next = z; |
3002 | } |
3003 | } |
3004 | } |
3005 | ++e; |
3006 | } |
3007 | |
3008 | // now process all active edges in XOR fashion |
3009 | if (active) |
3010 | stbtt__fill_active_edges(scanline, result->w, active, max_weight); |
3011 | |
3012 | ++y; |
3013 | } |
3014 | STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w); |
3015 | ++j; |
3016 | } |
3017 | |
3018 | stbtt__hheap_cleanup(&hh, userdata); |
3019 | |
3020 | if (scanline != scanline_data) |
3021 | STBTT_free(scanline, userdata); |
3022 | } |
3023 | |
3024 | #elif STBTT_RASTERIZER_VERSION == 2 |
3025 | |
3026 | // the edge passed in here does not cross the vertical line at x or the vertical line at x+1 |
3027 | // (i.e. it has already been clipped to those) |
3028 | static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edge *e, float x0, float y0, float x1, float y1) |
3029 | { |
3030 | if (y0 == y1) return; |
3031 | STBTT_assert(y0 < y1); |
3032 | STBTT_assert(e->sy <= e->ey); |
3033 | if (y0 > e->ey) return; |
3034 | if (y1 < e->sy) return; |
3035 | if (y0 < e->sy) { |
3036 | x0 += (x1-x0) * (e->sy - y0) / (y1-y0); |
3037 | y0 = e->sy; |
3038 | } |
3039 | if (y1 > e->ey) { |
3040 | x1 += (x1-x0) * (e->ey - y1) / (y1-y0); |
3041 | y1 = e->ey; |
3042 | } |
3043 | |
3044 | if (x0 == x) |
3045 | STBTT_assert(x1 <= x+1); |
3046 | else if (x0 == x+1) |
3047 | STBTT_assert(x1 >= x); |
3048 | else if (x0 <= x) |
3049 | STBTT_assert(x1 <= x); |
3050 | else if (x0 >= x+1) |
3051 | STBTT_assert(x1 >= x+1); |
3052 | else |
3053 | STBTT_assert(x1 >= x && x1 <= x+1); |
3054 | |
3055 | if (x0 <= x && x1 <= x) |
3056 | scanline[x] += e->direction * (y1-y0); |
3057 | else if (x0 >= x+1 && x1 >= x+1) |
3058 | ; |
3059 | else { |
3060 | STBTT_assert(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1); |
3061 | scanline[x] += e->direction * (y1-y0) * (1-((x0-x)+(x1-x))/2); // coverage = 1 - average x position |
3062 | } |
3063 | } |
3064 | |
3065 | static float stbtt__sized_trapezoid_area(float height, float top_width, float bottom_width) |
3066 | { |
3067 | STBTT_assert(top_width >= 0); |
3068 | STBTT_assert(bottom_width >= 0); |
3069 | return (top_width + bottom_width) / 2.0f * height; |
3070 | } |
3071 | |
3072 | static float stbtt__position_trapezoid_area(float height, float tx0, float tx1, float bx0, float bx1) |
3073 | { |
3074 | return stbtt__sized_trapezoid_area(height, tx1 - tx0, bx1 - bx0); |
3075 | } |
3076 | |
3077 | static float stbtt__sized_triangle_area(float height, float width) |
3078 | { |
3079 | return height * width / 2; |
3080 | } |
3081 | |
3082 | static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top) |
3083 | { |
3084 | float y_bottom = y_top+1; |
3085 | |
3086 | while (e) { |
3087 | // brute force every pixel |
3088 | |
3089 | // compute intersection points with top & bottom |
3090 | STBTT_assert(e->ey >= y_top); |
3091 | |
3092 | if (e->fdx == 0) { |
3093 | float x0 = e->fx; |
3094 | if (x0 < len) { |
3095 | if (x0 >= 0) { |
3096 | stbtt__handle_clipped_edge(scanline,(int) x0,e, x0,y_top, x0,y_bottom); |
3097 | stbtt__handle_clipped_edge(scanline_fill-1,(int) x0+1,e, x0,y_top, x0,y_bottom); |
3098 | } else { |
3099 | stbtt__handle_clipped_edge(scanline_fill-1,0,e, x0,y_top, x0,y_bottom); |
3100 | } |
3101 | } |
3102 | } else { |
3103 | float x0 = e->fx; |
3104 | float dx = e->fdx; |
3105 | float xb = x0 + dx; |
3106 | float x_top, x_bottom; |
3107 | float sy0,sy1; |
3108 | float dy = e->fdy; |
3109 | STBTT_assert(e->sy <= y_bottom && e->ey >= y_top); |
3110 | |
3111 | // compute endpoints of line segment clipped to this scanline (if the |
3112 | // line segment starts on this scanline. x0 is the intersection of the |
3113 | // line with y_top, but that may be off the line segment. |
3114 | if (e->sy > y_top) { |
3115 | x_top = x0 + dx * (e->sy - y_top); |
3116 | sy0 = e->sy; |
3117 | } else { |
3118 | x_top = x0; |
3119 | sy0 = y_top; |
3120 | } |
3121 | if (e->ey < y_bottom) { |
3122 | x_bottom = x0 + dx * (e->ey - y_top); |
3123 | sy1 = e->ey; |
3124 | } else { |
3125 | x_bottom = xb; |
3126 | sy1 = y_bottom; |
3127 | } |
3128 | |
3129 | if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) { |
3130 | // from here on, we don't have to range check x values |
3131 | |
3132 | if ((int) x_top == (int) x_bottom) { |
3133 | float height; |
3134 | // simple case, only spans one pixel |
3135 | int x = (int) x_top; |
3136 | height = (sy1 - sy0) * e->direction; |
3137 | STBTT_assert(x >= 0 && x < len); |
3138 | scanline[x] += stbtt__position_trapezoid_area(height, x_top, x+1.0f, x_bottom, x+1.0f); |
3139 | scanline_fill[x] += height; // everything right of this pixel is filled |
3140 | } else { |
3141 | int x,x1,x2; |
3142 | float y_crossing, y_final, step, sign, area; |
3143 | // covers 2+ pixels |
3144 | if (x_top > x_bottom) { |
3145 | // flip scanline vertically; signed area is the same |
3146 | float t; |
3147 | sy0 = y_bottom - (sy0 - y_top); |
3148 | sy1 = y_bottom - (sy1 - y_top); |
3149 | t = sy0, sy0 = sy1, sy1 = t; |
3150 | t = x_bottom, x_bottom = x_top, x_top = t; |
3151 | dx = -dx; |
3152 | dy = -dy; |
3153 | t = x0, x0 = xb, xb = t; |
3154 | } |
3155 | STBTT_assert(dy >= 0); |
3156 | STBTT_assert(dx >= 0); |
3157 | |
3158 | x1 = (int) x_top; |
3159 | x2 = (int) x_bottom; |
3160 | // compute intersection with y axis at x1+1 |
3161 | y_crossing = y_top + dy * (x1+1 - x0); |
3162 | |
3163 | // compute intersection with y axis at x2 |
3164 | y_final = y_top + dy * (x2 - x0); |
3165 | |
3166 | // x1 x_top x2 x_bottom |
3167 | // y_top +------|-----+------------+------------+--------|---+------------+ |
3168 | // | | | | | | |
3169 | // | | | | | | |
3170 | // sy0 | Txxxxx|............|............|............|............| |
3171 | // y_crossing | *xxxxx.......|............|............|............| |
3172 | // | | xxxxx..|............|............|............| |
3173 | // | | /- xx*xxxx........|............|............| |
3174 | // | | dy < | xxxxxx..|............|............| |
3175 | // y_final | | \- | xx*xxx.........|............| |
3176 | // sy1 | | | | xxxxxB...|............| |
3177 | // | | | | | | |
3178 | // | | | | | | |
3179 | // y_bottom +------------+------------+------------+------------+------------+ |
3180 | // |
3181 | // goal is to measure the area covered by '.' in each pixel |
3182 | |
3183 | // if x2 is right at the right edge of x1, y_crossing can blow up, github #1057 |
3184 | // @TODO: maybe test against sy1 rather than y_bottom? |
3185 | if (y_crossing > y_bottom) |
3186 | y_crossing = y_bottom; |
3187 | |
3188 | sign = e->direction; |
3189 | |
3190 | // area of the rectangle covered from sy0..y_crossing |
3191 | area = sign * (y_crossing-sy0); |
3192 | |
3193 | // area of the triangle (x_top,sy0), (x1+1,sy0), (x1+1,y_crossing) |
3194 | scanline[x1] += stbtt__sized_triangle_area(area, x1+1 - x_top); |
3195 | |
3196 | // check if final y_crossing is blown up; no test case for this |
3197 | if (y_final > y_bottom) { |
3198 | y_final = y_bottom; |
3199 | dy = (y_final - y_crossing ) / (x2 - (x1+1)); // if denom=0, y_final = y_crossing, so y_final <= y_bottom |
3200 | } |
3201 | |
3202 | // in second pixel, area covered by line segment found in first pixel |
3203 | // is always a rectangle 1 wide * the height of that line segment; this |
3204 | // is exactly what the variable 'area' stores. it also gets a contribution |
3205 | // from the line segment within it. the THIRD pixel will get the first |
3206 | // pixel's rectangle contribution, the second pixel's rectangle contribution, |
3207 | // and its own contribution. the 'own contribution' is the same in every pixel except |
3208 | // the leftmost and rightmost, a trapezoid that slides down in each pixel. |
3209 | // the second pixel's contribution to the third pixel will be the |
3210 | // rectangle 1 wide times the height change in the second pixel, which is dy. |
3211 | |
3212 | step = sign * dy * 1; // dy is dy/dx, change in y for every 1 change in x, |
3213 | // which multiplied by 1-pixel-width is how much pixel area changes for each step in x |
3214 | // so the area advances by 'step' every time |
3215 | |
3216 | for (x = x1+1; x < x2; ++x) { |
3217 | scanline[x] += area + step/2; // area of trapezoid is 1*step/2 |
3218 | area += step; |
3219 | } |
3220 | STBTT_assert(STBTT_fabs(area) <= 1.01f); // accumulated error from area += step unless we round step down |
3221 | STBTT_assert(sy1 > y_final-0.01f); |
3222 | |
3223 | // area covered in the last pixel is the rectangle from all the pixels to the left, |
3224 | // plus the trapezoid filled by the line segment in this pixel all the way to the right edge |
3225 | scanline[x2] += area + sign * stbtt__position_trapezoid_area(sy1-y_final, (float) x2, x2+1.0f, x_bottom, x2+1.0f); |
3226 | |
3227 | // the rest of the line is filled based on the total height of the line segment in this pixel |
3228 | scanline_fill[x2] += sign * (sy1-sy0); |
3229 | } |
3230 | } else { |
3231 | // if edge goes outside of box we're drawing, we require |
3232 | // clipping logic. since this does not match the intended use |
3233 | // of this library, we use a different, very slow brute |
3234 | // force implementation |
3235 | // note though that this does happen some of the time because |
3236 | // x_top and x_bottom can be extrapolated at the top & bottom of |
3237 | // the shape and actually lie outside the bounding box |
3238 | int x; |
3239 | for (x=0; x < len; ++x) { |
3240 | // cases: |
3241 | // |
3242 | // there can be up to two intersections with the pixel. any intersection |
3243 | // with left or right edges can be handled by splitting into two (or three) |
3244 | // regions. intersections with top & bottom do not necessitate case-wise logic. |
3245 | // |
3246 | // the old way of doing this found the intersections with the left & right edges, |
3247 | // then used some simple logic to produce up to three segments in sorted order |
3248 | // from top-to-bottom. however, this had a problem: if an x edge was epsilon |
3249 | // across the x border, then the corresponding y position might not be distinct |
3250 | // from the other y segment, and it might ignored as an empty segment. to avoid |
3251 | // that, we need to explicitly produce segments based on x positions. |
3252 | |
3253 | // rename variables to clearly-defined pairs |
3254 | float y0 = y_top; |
3255 | float x1 = (float) (x); |
3256 | float x2 = (float) (x+1); |
3257 | float x3 = xb; |
3258 | float y3 = y_bottom; |
3259 | |
3260 | // x = e->x + e->dx * (y-y_top) |
3261 | // (y-y_top) = (x - e->x) / e->dx |
3262 | // y = (x - e->x) / e->dx + y_top |
3263 | float y1 = (x - x0) / dx + y_top; |
3264 | float y2 = (x+1 - x0) / dx + y_top; |
3265 | |
3266 | if (x0 < x1 && x3 > x2) { // three segments descending down-right |
3267 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1); |
3268 | stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x2,y2); |
3269 | stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3); |
3270 | } else if (x3 < x1 && x0 > x2) { // three segments descending down-left |
3271 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2); |
3272 | stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x1,y1); |
3273 | stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3); |
3274 | } else if (x0 < x1 && x3 > x1) { // two segments across x, down-right |
3275 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1); |
3276 | stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3); |
3277 | } else if (x3 < x1 && x0 > x1) { // two segments across x, down-left |
3278 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1); |
3279 | stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3); |
3280 | } else if (x0 < x2 && x3 > x2) { // two segments across x+1, down-right |
3281 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2); |
3282 | stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3); |
3283 | } else if (x3 < x2 && x0 > x2) { // two segments across x+1, down-left |
3284 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2); |
3285 | stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3); |
3286 | } else { // one segment |
3287 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x3,y3); |
3288 | } |
3289 | } |
3290 | } |
3291 | } |
3292 | e = e->next; |
3293 | } |
3294 | } |
3295 | |
3296 | // directly AA rasterize edges w/o supersampling |
3297 | static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata) |
3298 | { |
3299 | stbtt__hheap hh = { 0, 0, 0 }; |
3300 | stbtt__active_edge *active = NULL; |
3301 | int y,j=0, i; |
3302 | float scanline_data[129], *scanline, *scanline2; |
3303 | |
3304 | STBTT__NOTUSED(vsubsample); |
3305 | |
3306 | if (result->w > 64) |
3307 | scanline = (float *) STBTT_malloc((result->w*2+1) * sizeof(float), userdata); |
3308 | else |
3309 | scanline = scanline_data; |
3310 | |
3311 | scanline2 = scanline + result->w; |
3312 | |
3313 | y = off_y; |
3314 | e[n].y0 = (float) (off_y + result->h) + 1; |
3315 | |
3316 | while (j < result->h) { |
3317 | // find center of pixel for this scanline |
3318 | float scan_y_top = y + 0.0f; |
3319 | float scan_y_bottom = y + 1.0f; |
3320 | stbtt__active_edge **step = &active; |
3321 | |
3322 | STBTT_memset(scanline , 0, result->w*sizeof(scanline[0])); |
3323 | STBTT_memset(scanline2, 0, (result->w+1)*sizeof(scanline[0])); |
3324 | |
3325 | // update all active edges; |
3326 | // remove all active edges that terminate before the top of this scanline |
3327 | while (*step) { |
3328 | stbtt__active_edge * z = *step; |
3329 | if (z->ey <= scan_y_top) { |
3330 | *step = z->next; // delete from list |
3331 | STBTT_assert(z->direction); |
3332 | z->direction = 0; |
3333 | stbtt__hheap_free(&hh, z); |
3334 | } else { |
3335 | step = &((*step)->next); // advance through list |
3336 | } |
3337 | } |
3338 | |
3339 | // insert all edges that start before the bottom of this scanline |
3340 | while (e->y0 <= scan_y_bottom) { |
3341 | if (e->y0 != e->y1) { |
3342 | stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata); |
3343 | if (z != NULL) { |
3344 | if (j == 0 && off_y != 0) { |
3345 | if (z->ey < scan_y_top) { |
3346 | // this can happen due to subpixel positioning and some kind of fp rounding error i think |
3347 | z->ey = scan_y_top; |
3348 | } |
3349 | } |
3350 | STBTT_assert(z->ey >= scan_y_top); // if we get really unlucky a tiny bit of an edge can be out of bounds |
3351 | // insert at front |
3352 | z->next = active; |
3353 | active = z; |
3354 | } |
3355 | } |
3356 | ++e; |
3357 | } |
3358 | |
3359 | // now process all active edges |
3360 | if (active) |
3361 | stbtt__fill_active_edges_new(scanline, scanline2+1, result->w, active, scan_y_top); |
3362 | |
3363 | { |
3364 | float sum = 0; |
3365 | for (i=0; i < result->w; ++i) { |
3366 | float k; |
3367 | int m; |
3368 | sum += scanline2[i]; |
3369 | k = scanline[i] + sum; |
3370 | k = (float) STBTT_fabs(k)*255 + 0.5f; |
3371 | m = (int) k; |
3372 | if (m > 255) m = 255; |
3373 | result->pixels[j*result->stride + i] = (unsigned char) m; |
3374 | } |
3375 | } |
3376 | // advance all the edges |
3377 | step = &active; |
3378 | while (*step) { |
3379 | stbtt__active_edge *z = *step; |
3380 | z->fx += z->fdx; // advance to position for current scanline |
3381 | step = &((*step)->next); // advance through list |
3382 | } |
3383 | |
3384 | ++y; |
3385 | ++j; |
3386 | } |
3387 | |
3388 | stbtt__hheap_cleanup(&hh, userdata); |
3389 | |
3390 | if (scanline != scanline_data) |
3391 | STBTT_free(scanline, userdata); |
3392 | } |
3393 | #else |
3394 | #error "Unrecognized value of STBTT_RASTERIZER_VERSION" |
3395 | #endif |
3396 | |
3397 | #define STBTT__COMPARE(a,b) ((a)->y0 < (b)->y0) |
3398 | |
3399 | static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n) |
3400 | { |
3401 | int i,j; |
3402 | for (i=1; i < n; ++i) { |
3403 | stbtt__edge t = p[i], *a = &t; |
3404 | j = i; |
3405 | while (j > 0) { |
3406 | stbtt__edge *b = &p[j-1]; |
3407 | int c = STBTT__COMPARE(a,b); |
3408 | if (!c) break; |
3409 | p[j] = p[j-1]; |
3410 | --j; |
3411 | } |
3412 | if (i != j) |
3413 | p[j] = t; |
3414 | } |
3415 | } |
3416 | |
3417 | static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n) |
3418 | { |
3419 | /* threshold for transitioning to insertion sort */ |
3420 | while (n > 12) { |
3421 | stbtt__edge t; |
3422 | int c01,c12,c,m,i,j; |
3423 | |
3424 | /* compute median of three */ |
3425 | m = n >> 1; |
3426 | c01 = STBTT__COMPARE(&p[0],&p[m]); |
3427 | c12 = STBTT__COMPARE(&p[m],&p[n-1]); |
3428 | /* if 0 >= mid >= end, or 0 < mid < end, then use mid */ |
3429 | if (c01 != c12) { |
3430 | /* otherwise, we'll need to swap something else to middle */ |
3431 | int z; |
3432 | c = STBTT__COMPARE(&p[0],&p[n-1]); |
3433 | /* 0>mid && mid<n: 0>n => n; 0<n => 0 */ |
3434 | /* 0<mid && mid>n: 0>n => 0; 0<n => n */ |
3435 | z = (c == c12) ? 0 : n-1; |
3436 | t = p[z]; |
3437 | p[z] = p[m]; |
3438 | p[m] = t; |
3439 | } |
3440 | /* now p[m] is the median-of-three */ |
3441 | /* swap it to the beginning so it won't move around */ |
3442 | t = p[0]; |
3443 | p[0] = p[m]; |
3444 | p[m] = t; |
3445 | |
3446 | /* partition loop */ |
3447 | i=1; |
3448 | j=n-1; |
3449 | for(;;) { |
3450 | /* handling of equality is crucial here */ |
3451 | /* for sentinels & efficiency with duplicates */ |
3452 | for (;;++i) { |
3453 | if (!STBTT__COMPARE(&p[i], &p[0])) break; |
3454 | } |
3455 | for (;;--j) { |
3456 | if (!STBTT__COMPARE(&p[0], &p[j])) break; |
3457 | } |
3458 | /* make sure we haven't crossed */ |
3459 | if (i >= j) break; |
3460 | t = p[i]; |
3461 | p[i] = p[j]; |
3462 | p[j] = t; |
3463 | |
3464 | ++i; |
3465 | --j; |
3466 | } |
3467 | /* recurse on smaller side, iterate on larger */ |
3468 | if (j < (n-i)) { |
3469 | stbtt__sort_edges_quicksort(p,j); |
3470 | p = p+i; |
3471 | n = n-i; |
3472 | } else { |
3473 | stbtt__sort_edges_quicksort(p+i, n-i); |
3474 | n = j; |
3475 | } |
3476 | } |
3477 | } |
3478 | |
3479 | static void stbtt__sort_edges(stbtt__edge *p, int n) |
3480 | { |
3481 | stbtt__sort_edges_quicksort(p, n); |
3482 | stbtt__sort_edges_ins_sort(p, n); |
3483 | } |
3484 | |
3485 | typedef struct |
3486 | { |
3487 | float x,y; |
3488 | } stbtt__point; |
3489 | |
3490 | 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) |
3491 | { |
3492 | float y_scale_inv = invert ? -scale_y : scale_y; |
3493 | stbtt__edge *e; |
3494 | int n,i,j,k,m; |
3495 | #if STBTT_RASTERIZER_VERSION == 1 |
3496 | int vsubsample = result->h < 8 ? 15 : 5; |
3497 | #elif STBTT_RASTERIZER_VERSION == 2 |
3498 | int vsubsample = 1; |
3499 | #else |
3500 | #error "Unrecognized value of STBTT_RASTERIZER_VERSION" |
3501 | #endif |
3502 | // vsubsample should divide 255 evenly; otherwise we won't reach full opacity |
3503 | |
3504 | // now we have to blow out the windings into explicit edge lists |
3505 | n = 0; |
3506 | for (i=0; i < windings; ++i) |
3507 | n += wcount[i]; |
3508 | |
3509 | e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel |
3510 | if (e == 0) return; |
3511 | n = 0; |
3512 | |
3513 | m=0; |
3514 | for (i=0; i < windings; ++i) { |
3515 | stbtt__point *p = pts + m; |
3516 | m += wcount[i]; |
3517 | j = wcount[i]-1; |
3518 | for (k=0; k < wcount[i]; j=k++) { |
3519 | int a=k,b=j; |
3520 | // skip the edge if horizontal |
3521 | if (p[j].y == p[k].y) |
3522 | continue; |
3523 | // add edge from j to k to the list |
3524 | e[n].invert = 0; |
3525 | if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) { |
3526 | e[n].invert = 1; |
3527 | a=j,b=k; |
3528 | } |
3529 | e[n].x0 = p[a].x * scale_x + shift_x; |
3530 | e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample; |
3531 | e[n].x1 = p[b].x * scale_x + shift_x; |
3532 | e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample; |
3533 | ++n; |
3534 | } |
3535 | } |
3536 | |
3537 | // now sort the edges by their highest point (should snap to integer, and then by x) |
3538 | //STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare); |
3539 | stbtt__sort_edges(e, n); |
3540 | |
3541 | // now, traverse the scanlines and find the intersections on each scanline, use xor winding rule |
3542 | stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata); |
3543 | |
3544 | STBTT_free(e, userdata); |
3545 | } |
3546 | |
3547 | static void stbtt__add_point(stbtt__point *points, int n, float x, float y) |
3548 | { |
3549 | if (!points) return; // during first pass, it's unallocated |
3550 | points[n].x = x; |
3551 | points[n].y = y; |
3552 | } |
3553 | |
3554 | // tessellate until threshold p is happy... @TODO warped to compensate for non-linear stretching |
3555 | 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) |
3556 | { |
3557 | // midpoint |
3558 | float mx = (x0 + 2*x1 + x2)/4; |
3559 | float my = (y0 + 2*y1 + y2)/4; |
3560 | // versus directly drawn line |
3561 | float dx = (x0+x2)/2 - mx; |
3562 | float dy = (y0+y2)/2 - my; |
3563 | if (n > 16) // 65536 segments on one curve better be enough! |
3564 | return 1; |
3565 | if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA |
3566 | stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1); |
3567 | stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1); |
3568 | } else { |
3569 | stbtt__add_point(points, *num_points,x2,y2); |
3570 | *num_points = *num_points+1; |
3571 | } |
3572 | return 1; |
3573 | } |
3574 | |
3575 | static void stbtt__tesselate_cubic(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3, float objspace_flatness_squared, int n) |
3576 | { |
3577 | // @TODO this "flatness" calculation is just made-up nonsense that seems to work well enough |
3578 | float dx0 = x1-x0; |
3579 | float dy0 = y1-y0; |
3580 | float dx1 = x2-x1; |
3581 | float dy1 = y2-y1; |
3582 | float dx2 = x3-x2; |
3583 | float dy2 = y3-y2; |
3584 | float dx = x3-x0; |
3585 | float dy = y3-y0; |
3586 | float longlen = (float) (STBTT_sqrt(dx0*dx0+dy0*dy0)+STBTT_sqrt(dx1*dx1+dy1*dy1)+STBTT_sqrt(dx2*dx2+dy2*dy2)); |
3587 | float shortlen = (float) STBTT_sqrt(dx*dx+dy*dy); |
3588 | float flatness_squared = longlen*longlen-shortlen*shortlen; |
3589 | |
3590 | if (n > 16) // 65536 segments on one curve better be enough! |
3591 | return; |
3592 | |
3593 | if (flatness_squared > objspace_flatness_squared) { |
3594 | float x01 = (x0+x1)/2; |
3595 | float y01 = (y0+y1)/2; |
3596 | float x12 = (x1+x2)/2; |
3597 | float y12 = (y1+y2)/2; |
3598 | float x23 = (x2+x3)/2; |
3599 | float y23 = (y2+y3)/2; |
3600 | |
3601 | float xa = (x01+x12)/2; |
3602 | float ya = (y01+y12)/2; |
3603 | float xb = (x12+x23)/2; |
3604 | float yb = (y12+y23)/2; |
3605 | |
3606 | float mx = (xa+xb)/2; |
3607 | float my = (ya+yb)/2; |
3608 | |
3609 | stbtt__tesselate_cubic(points, num_points, x0,y0, x01,y01, xa,ya, mx,my, objspace_flatness_squared,n+1); |
3610 | stbtt__tesselate_cubic(points, num_points, mx,my, xb,yb, x23,y23, x3,y3, objspace_flatness_squared,n+1); |
3611 | } else { |
3612 | stbtt__add_point(points, *num_points,x3,y3); |
3613 | *num_points = *num_points+1; |
3614 | } |
3615 | } |
3616 | |
3617 | // returns number of contours |
3618 | static stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata) |
3619 | { |
3620 | stbtt__point *points=0; |
3621 | int num_points=0; |
3622 | |
3623 | float objspace_flatness_squared = objspace_flatness * objspace_flatness; |
3624 | int i,n=0,start=0, pass; |
3625 | |
3626 | // count how many "moves" there are to get the contour count |
3627 | for (i=0; i < num_verts; ++i) |
3628 | if (vertices[i].type == STBTT_vmove) |
3629 | ++n; |
3630 | |
3631 | *num_contours = n; |
3632 | if (n == 0) return 0; |
3633 | |
3634 | *contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata); |
3635 | |
3636 | if (*contour_lengths == 0) { |
3637 | *num_contours = 0; |
3638 | return 0; |
3639 | } |
3640 | |
3641 | // make two passes through the points so we don't need to realloc |
3642 | for (pass=0; pass < 2; ++pass) { |
3643 | float x=0,y=0; |
3644 | if (pass == 1) { |
3645 | points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata); |
3646 | if (points == NULL) goto error; |
3647 | } |
3648 | num_points = 0; |
3649 | n= -1; |
3650 | for (i=0; i < num_verts; ++i) { |
3651 | switch (vertices[i].type) { |
3652 | case STBTT_vmove: |
3653 | // start the next contour |
3654 | if (n >= 0) |
3655 | (*contour_lengths)[n] = num_points - start; |
3656 | ++n; |
3657 | start = num_points; |
3658 | |
3659 | x = vertices[i].x, y = vertices[i].y; |
3660 | stbtt__add_point(points, num_points++, x,y); |
3661 | break; |
3662 | case STBTT_vline: |
3663 | x = vertices[i].x, y = vertices[i].y; |
3664 | stbtt__add_point(points, num_points++, x, y); |
3665 | break; |
3666 | case STBTT_vcurve: |
3667 | stbtt__tesselate_curve(points, &num_points, x,y, |
3668 | vertices[i].cx, vertices[i].cy, |
3669 | vertices[i].x, vertices[i].y, |
3670 | objspace_flatness_squared, 0); |
3671 | x = vertices[i].x, y = vertices[i].y; |
3672 | break; |
3673 | case STBTT_vcubic: |
3674 | stbtt__tesselate_cubic(points, &num_points, x,y, |
3675 | vertices[i].cx, vertices[i].cy, |
3676 | vertices[i].cx1, vertices[i].cy1, |
3677 | vertices[i].x, vertices[i].y, |
3678 | objspace_flatness_squared, 0); |
3679 | x = vertices[i].x, y = vertices[i].y; |
3680 | break; |
3681 | } |
3682 | } |
3683 | (*contour_lengths)[n] = num_points - start; |
3684 | } |
3685 | |
3686 | return points; |
3687 | error: |
3688 | STBTT_free(points, userdata); |
3689 | STBTT_free(*contour_lengths, userdata); |
3690 | *contour_lengths = 0; |
3691 | *num_contours = 0; |
3692 | return NULL; |
3693 | } |
3694 | |
3695 | 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) |
3696 | { |
3697 | float scale = scale_x > scale_y ? scale_y : scale_x; |
3698 | int winding_count = 0; |
3699 | int *winding_lengths = NULL; |
3700 | stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata); |
3701 | if (windings) { |
3702 | stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata); |
3703 | STBTT_free(winding_lengths, userdata); |
3704 | STBTT_free(windings, userdata); |
3705 | } |
3706 | } |
3707 | |
3708 | STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata) |
3709 | { |
3710 | STBTT_free(bitmap, userdata); |
3711 | } |
3712 | |
3713 | 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) |
3714 | { |
3715 | int ix0,iy0,ix1,iy1; |
3716 | stbtt__bitmap gbm; |
3717 | stbtt_vertex *vertices; |
3718 | int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices); |
3719 | |
3720 | if (scale_x == 0) scale_x = scale_y; |
3721 | if (scale_y == 0) { |
3722 | if (scale_x == 0) { |
3723 | STBTT_free(vertices, info->userdata); |
3724 | return NULL; |
3725 | } |
3726 | scale_y = scale_x; |
3727 | } |
3728 | |
3729 | stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1); |
3730 | |
3731 | // now we get the size |
3732 | gbm.w = (ix1 - ix0); |
3733 | gbm.h = (iy1 - iy0); |
3734 | gbm.pixels = NULL; // in case we error |
3735 | |
3736 | if (width ) *width = gbm.w; |
3737 | if (height) *height = gbm.h; |
3738 | if (xoff ) *xoff = ix0; |
3739 | if (yoff ) *yoff = iy0; |
3740 | |
3741 | if (gbm.w && gbm.h) { |
3742 | gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata); |
3743 | if (gbm.pixels) { |
3744 | gbm.stride = gbm.w; |
3745 | |
3746 | stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata); |
3747 | } |
3748 | } |
3749 | STBTT_free(vertices, info->userdata); |
3750 | return gbm.pixels; |
3751 | } |
3752 | |
3753 | 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) |
3754 | { |
3755 | return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff); |
3756 | } |
3757 | |
3758 | 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) |
3759 | { |
3760 | int ix0,iy0; |
3761 | stbtt_vertex *vertices; |
3762 | int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices); |
3763 | stbtt__bitmap gbm; |
3764 | |
3765 | stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0); |
3766 | gbm.pixels = output; |
3767 | gbm.w = out_w; |
3768 | gbm.h = out_h; |
3769 | gbm.stride = out_stride; |
3770 | |
3771 | if (gbm.w && gbm.h) |
3772 | stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata); |
3773 | |
3774 | STBTT_free(vertices, info->userdata); |
3775 | } |
3776 | |
3777 | 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) |
3778 | { |
3779 | stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph); |
3780 | } |
3781 | |
3782 | 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) |
3783 | { |
3784 | return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff); |
3785 | } |
3786 | |
3787 | STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint) |
3788 | { |
3789 | stbtt_MakeGlyphBitmapSubpixelPrefilter(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, oversample_x, oversample_y, sub_x, sub_y, stbtt_FindGlyphIndex(info,codepoint)); |
3790 | } |
3791 | |
3792 | 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) |
3793 | { |
3794 | stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint)); |
3795 | } |
3796 | |
3797 | 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) |
3798 | { |
3799 | return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff); |
3800 | } |
3801 | |
3802 | 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) |
3803 | { |
3804 | stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint); |
3805 | } |
3806 | |
3807 | ////////////////////////////////////////////////////////////////////////////// |
3808 | // |
3809 | // bitmap baking |
3810 | // |
3811 | // This is SUPER-CRAPPY packing to keep source code small |
3812 | |
3813 | static int stbtt_BakeFontBitmap_internal(unsigned char *data, int offset, // font location (use offset=0 for plain .ttf) |
3814 | float pixel_height, // height of font in pixels |
3815 | unsigned char *pixels, int pw, int ph, // bitmap to be filled in |
3816 | int first_char, int num_chars, // characters to bake |
3817 | stbtt_bakedchar *chardata) |
3818 | { |
3819 | float scale; |
3820 | int x,y,bottom_y, i; |
3821 | stbtt_fontinfo f; |
3822 | f.userdata = NULL; |
3823 | if (!stbtt_InitFont(&f, data, offset)) |
3824 | return -1; |
3825 | STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels |
3826 | x=y=1; |
3827 | bottom_y = 1; |
3828 | |
3829 | scale = stbtt_ScaleForPixelHeight(&f, pixel_height); |
3830 | |
3831 | for (i=0; i < num_chars; ++i) { |
3832 | int advance, lsb, x0,y0,x1,y1,gw,gh; |
3833 | int g = stbtt_FindGlyphIndex(&f, first_char + i); |
3834 | stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb); |
3835 | stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1); |
3836 | gw = x1-x0; |
3837 | gh = y1-y0; |
3838 | if (x + gw + 1 >= pw) |
3839 | y = bottom_y, x = 1; // advance to next row |
3840 | if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row |
3841 | return -i; |
3842 | STBTT_assert(x+gw < pw); |
3843 | STBTT_assert(y+gh < ph); |
3844 | stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g); |
3845 | chardata[i].x0 = (stbtt_int16) x; |
3846 | chardata[i].y0 = (stbtt_int16) y; |
3847 | chardata[i].x1 = (stbtt_int16) (x + gw); |
3848 | chardata[i].y1 = (stbtt_int16) (y + gh); |
3849 | chardata[i].xadvance = scale * advance; |
3850 | chardata[i].xoff = (float) x0; |
3851 | chardata[i].yoff = (float) y0; |
3852 | x = x + gw + 1; |
3853 | if (y+gh+1 > bottom_y) |
3854 | bottom_y = y+gh+1; |
3855 | } |
3856 | return bottom_y; |
3857 | } |
3858 | |
3859 | STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule) |
3860 | { |
3861 | float d3d_bias = opengl_fillrule ? 0 : -0.5f; |
3862 | float ipw = 1.0f / pw, iph = 1.0f / ph; |
3863 | const stbtt_bakedchar *b = chardata + char_index; |
3864 | int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f); |
3865 | int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f); |
3866 | |
3867 | q->x0 = round_x + d3d_bias; |
3868 | q->y0 = round_y + d3d_bias; |
3869 | q->x1 = round_x + b->x1 - b->x0 + d3d_bias; |
3870 | q->y1 = round_y + b->y1 - b->y0 + d3d_bias; |
3871 | |
3872 | q->s0 = b->x0 * ipw; |
3873 | q->t0 = b->y0 * iph; |
3874 | q->s1 = b->x1 * ipw; |
3875 | q->t1 = b->y1 * iph; |
3876 | |
3877 | *xpos += b->xadvance; |
3878 | } |
3879 | |
3880 | ////////////////////////////////////////////////////////////////////////////// |
3881 | // |
3882 | // rectangle packing replacement routines if you don't have stb_rect_pack.h |
3883 | // |
3884 | |
3885 | #ifndef STB_RECT_PACK_VERSION |
3886 | |
3887 | typedef int stbrp_coord; |
3888 | |
3889 | //////////////////////////////////////////////////////////////////////////////////// |
3890 | // // |
3891 | // // |
3892 | // COMPILER WARNING ?!?!? // |
3893 | // // |
3894 | // // |
3895 | // if you get a compile warning due to these symbols being defined more than // |
3896 | // once, move #include "stb_rect_pack.h" before #include "stb_truetype.h" // |
3897 | // // |
3898 | //////////////////////////////////////////////////////////////////////////////////// |
3899 | |
3900 | typedef struct |
3901 | { |
3902 | int width,height; |
3903 | int x,y,bottom_y; |
3904 | } stbrp_context; |
3905 | |
3906 | typedef struct |
3907 | { |
3908 | unsigned char x; |
3909 | } stbrp_node; |
3910 | |
3911 | struct stbrp_rect |
3912 | { |
3913 | stbrp_coord x,y; |
3914 | int id,w,h,was_packed; |
3915 | }; |
3916 | |
3917 | static void stbrp_init_target(stbrp_context *con, int pw, int ph, stbrp_node *nodes, int num_nodes) |
3918 | { |
3919 | con->width = pw; |
3920 | con->height = ph; |
3921 | con->x = 0; |
3922 | con->y = 0; |
3923 | con->bottom_y = 0; |
3924 | STBTT__NOTUSED(nodes); |
3925 | STBTT__NOTUSED(num_nodes); |
3926 | } |
3927 | |
3928 | static void stbrp_pack_rects(stbrp_context *con, stbrp_rect *rects, int num_rects) |
3929 | { |
3930 | int i; |
3931 | for (i=0; i < num_rects; ++i) { |
3932 | if (con->x + rects[i].w > con->width) { |
3933 | con->x = 0; |
3934 | con->y = con->bottom_y; |
3935 | } |
3936 | if (con->y + rects[i].h > con->height) |
3937 | break; |
3938 | rects[i].x = con->x; |
3939 | rects[i].y = con->y; |
3940 | rects[i].was_packed = 1; |
3941 | con->x += rects[i].w; |
3942 | if (con->y + rects[i].h > con->bottom_y) |
3943 | con->bottom_y = con->y + rects[i].h; |
3944 | } |
3945 | for ( ; i < num_rects; ++i) |
3946 | rects[i].was_packed = 0; |
3947 | } |
3948 | #endif |
3949 | |
3950 | ////////////////////////////////////////////////////////////////////////////// |
3951 | // |
3952 | // bitmap baking |
3953 | // |
3954 | // This is SUPER-AWESOME (tm Ryan Gordon) packing using stb_rect_pack.h. If |
3955 | // stb_rect_pack.h isn't available, it uses the BakeFontBitmap strategy. |
3956 | |
3957 | 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) |
3958 | { |
3959 | stbrp_context *context = (stbrp_context *) STBTT_malloc(sizeof(*context) ,alloc_context); |
3960 | int num_nodes = pw - padding; |
3961 | stbrp_node *nodes = (stbrp_node *) STBTT_malloc(sizeof(*nodes ) * num_nodes,alloc_context); |
3962 | |
3963 | if (context == NULL || nodes == NULL) { |
3964 | if (context != NULL) STBTT_free(context, alloc_context); |
3965 | if (nodes != NULL) STBTT_free(nodes , alloc_context); |
3966 | return 0; |
3967 | } |
3968 | |
3969 | spc->user_allocator_context = alloc_context; |
3970 | spc->width = pw; |
3971 | spc->height = ph; |
3972 | spc->pixels = pixels; |
3973 | spc->pack_info = context; |
3974 | spc->nodes = nodes; |
3975 | spc->padding = padding; |
3976 | spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw; |
3977 | spc->h_oversample = 1; |
3978 | spc->v_oversample = 1; |
3979 | spc->skip_missing = 0; |
3980 | |
3981 | stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes); |
3982 | |
3983 | if (pixels) |
3984 | STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels |
3985 | |
3986 | return 1; |
3987 | } |
3988 | |
3989 | STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc) |
3990 | { |
3991 | STBTT_free(spc->nodes , spc->user_allocator_context); |
3992 | STBTT_free(spc->pack_info, spc->user_allocator_context); |
3993 | } |
3994 | |
3995 | STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample) |
3996 | { |
3997 | STBTT_assert(h_oversample <= STBTT_MAX_OVERSAMPLE); |
3998 | STBTT_assert(v_oversample <= STBTT_MAX_OVERSAMPLE); |
3999 | if (h_oversample <= STBTT_MAX_OVERSAMPLE) |
4000 | spc->h_oversample = h_oversample; |
4001 | if (v_oversample <= STBTT_MAX_OVERSAMPLE) |
4002 | spc->v_oversample = v_oversample; |
4003 | } |
4004 | |
4005 | STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip) |
4006 | { |
4007 | spc->skip_missing = skip; |
4008 | } |
4009 | |
4010 | #define STBTT__OVER_MASK (STBTT_MAX_OVERSAMPLE-1) |
4011 | |
4012 | static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width) |
4013 | { |
4014 | unsigned char buffer[STBTT_MAX_OVERSAMPLE]; |
4015 | int safe_w = w - kernel_width; |
4016 | int j; |
4017 | STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze |
4018 | for (j=0; j < h; ++j) { |
4019 | int i; |
4020 | unsigned int total; |
4021 | STBTT_memset(buffer, 0, kernel_width); |
4022 | |
4023 | total = 0; |
4024 | |
4025 | // make kernel_width a constant in common cases so compiler can optimize out the divide |
4026 | switch (kernel_width) { |
4027 | case 2: |
4028 | for (i=0; i <= safe_w; ++i) { |
4029 | total += pixels[i] - buffer[i & STBTT__OVER_MASK]; |
4030 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; |
4031 | pixels[i] = (unsigned char) (total / 2); |
4032 | } |
4033 | break; |
4034 | case 3: |
4035 | for (i=0; i <= safe_w; ++i) { |
4036 | total += pixels[i] - buffer[i & STBTT__OVER_MASK]; |
4037 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; |
4038 | pixels[i] = (unsigned char) (total / 3); |
4039 | } |
4040 | break; |
4041 | case 4: |
4042 | for (i=0; i <= safe_w; ++i) { |
4043 | total += pixels[i] - buffer[i & STBTT__OVER_MASK]; |
4044 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; |
4045 | pixels[i] = (unsigned char) (total / 4); |
4046 | } |
4047 | break; |
4048 | case 5: |
4049 | for (i=0; i <= safe_w; ++i) { |
4050 | total += pixels[i] - buffer[i & STBTT__OVER_MASK]; |
4051 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; |
4052 | pixels[i] = (unsigned char) (total / 5); |
4053 | } |
4054 | break; |
4055 | default: |
4056 | for (i=0; i <= safe_w; ++i) { |
4057 | total += pixels[i] - buffer[i & STBTT__OVER_MASK]; |
4058 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i]; |
4059 | pixels[i] = (unsigned char) (total / kernel_width); |
4060 | } |
4061 | break; |
4062 | } |
4063 | |
4064 | for (; i < w; ++i) { |
4065 | STBTT_assert(pixels[i] == 0); |
4066 | total -= buffer[i & STBTT__OVER_MASK]; |
4067 | pixels[i] = (unsigned char) (total / kernel_width); |
4068 | } |
4069 | |
4070 | pixels += stride_in_bytes; |
4071 | } |
4072 | } |
4073 | |
4074 | static void stbtt__v_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width) |
4075 | { |
4076 | unsigned char buffer[STBTT_MAX_OVERSAMPLE]; |
4077 | int safe_h = h - kernel_width; |
4078 | int j; |
4079 | STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze |
4080 | for (j=0; j < w; ++j) { |
4081 | int i; |
4082 | unsigned int total; |
4083 | STBTT_memset(buffer, 0, kernel_width); |
4084 | |
4085 | total = 0; |
4086 | |
4087 | // make kernel_width a constant in common cases so compiler can optimize out the divide |
4088 | switch (kernel_width) { |
4089 | case 2: |
4090 | for (i=0; i <= safe_h; ++i) { |
4091 | total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; |
4092 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; |
4093 | pixels[i*stride_in_bytes] = (unsigned char) (total / 2); |
4094 | } |
4095 | break; |
4096 | case 3: |
4097 | for (i=0; i <= safe_h; ++i) { |
4098 | total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; |
4099 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; |
4100 | pixels[i*stride_in_bytes] = (unsigned char) (total / 3); |
4101 | } |
4102 | break; |
4103 | case 4: |
4104 | for (i=0; i <= safe_h; ++i) { |
4105 | total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; |
4106 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; |
4107 | pixels[i*stride_in_bytes] = (unsigned char) (total / 4); |
4108 | } |
4109 | break; |
4110 | case 5: |
4111 | for (i=0; i <= safe_h; ++i) { |
4112 | total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; |
4113 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; |
4114 | pixels[i*stride_in_bytes] = (unsigned char) (total / 5); |
4115 | } |
4116 | break; |
4117 | default: |
4118 | for (i=0; i <= safe_h; ++i) { |
4119 | total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK]; |
4120 | buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes]; |
4121 | pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width); |
4122 | } |
4123 | break; |
4124 | } |
4125 | |
4126 | for (; i < h; ++i) { |
4127 | STBTT_assert(pixels[i*stride_in_bytes] == 0); |
4128 | total -= buffer[i & STBTT__OVER_MASK]; |
4129 | pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width); |
4130 | } |
4131 | |
4132 | pixels += 1; |
4133 | } |
4134 | } |
4135 | |
4136 | static float stbtt__oversample_shift(int oversample) |
4137 | { |
4138 | if (!oversample) |
4139 | return 0.0f; |
4140 | |
4141 | // The prefilter is a box filter of width "oversample", |
4142 | // which shifts phase by (oversample - 1)/2 pixels in |
4143 | // oversampled space. We want to shift in the opposite |
4144 | // direction to counter this. |
4145 | return (float)-(oversample - 1) / (2.0f * (float)oversample); |
4146 | } |
4147 | |
4148 | // rects array must be big enough to accommodate all characters in the given ranges |
4149 | STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects) |
4150 | { |
4151 | int i,j,k; |
4152 | int missing_glyph_added = 0; |
4153 | |
4154 | k=0; |
4155 | for (i=0; i < num_ranges; ++i) { |
4156 | float fh = ranges[i].font_size; |
4157 | float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh); |
4158 | ranges[i].h_oversample = (unsigned char) spc->h_oversample; |
4159 | ranges[i].v_oversample = (unsigned char) spc->v_oversample; |
4160 | for (j=0; j < ranges[i].num_chars; ++j) { |
4161 | int x0,y0,x1,y1; |
4162 | int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j]; |
4163 | int glyph = stbtt_FindGlyphIndex(info, codepoint); |
4164 | if (glyph == 0 && (spc->skip_missing || missing_glyph_added)) { |
4165 | rects[k].w = rects[k].h = 0; |
4166 | } else { |
4167 | stbtt_GetGlyphBitmapBoxSubpixel(info,glyph, |
4168 | scale * spc->h_oversample, |
4169 | scale * spc->v_oversample, |
4170 | 0,0, |
4171 | &x0,&y0,&x1,&y1); |
4172 | rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1); |
4173 | rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1); |
4174 | if (glyph == 0) |
4175 | missing_glyph_added = 1; |
4176 | } |
4177 | ++k; |
4178 | } |
4179 | } |
4180 | |
4181 | return k; |
4182 | } |
4183 | |
4184 | STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int prefilter_x, int prefilter_y, float *sub_x, float *sub_y, int glyph) |
4185 | { |
4186 | stbtt_MakeGlyphBitmapSubpixel(info, |
4187 | output, |
4188 | out_w - (prefilter_x - 1), |
4189 | out_h - (prefilter_y - 1), |
4190 | out_stride, |
4191 | scale_x, |
4192 | scale_y, |
4193 | shift_x, |
4194 | shift_y, |
4195 | glyph); |
4196 | |
4197 | if (prefilter_x > 1) |
4198 | stbtt__h_prefilter(output, out_w, out_h, out_stride, prefilter_x); |
4199 | |
4200 | if (prefilter_y > 1) |
4201 | stbtt__v_prefilter(output, out_w, out_h, out_stride, prefilter_y); |
4202 | |
4203 | *sub_x = stbtt__oversample_shift(prefilter_x); |
4204 | *sub_y = stbtt__oversample_shift(prefilter_y); |
4205 | } |
4206 | |
4207 | // rects array must be big enough to accommodate all characters in the given ranges |
4208 | STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects) |
4209 | { |
4210 | int i,j,k, missing_glyph = -1, return_value = 1; |
4211 | |
4212 | // save current values |
4213 | int old_h_over = spc->h_oversample; |
4214 | int old_v_over = spc->v_oversample; |
4215 | |
4216 | k = 0; |
4217 | for (i=0; i < num_ranges; ++i) { |
4218 | float fh = ranges[i].font_size; |
4219 | float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh); |
4220 | float recip_h,recip_v,sub_x,sub_y; |
4221 | spc->h_oversample = ranges[i].h_oversample; |
4222 | spc->v_oversample = ranges[i].v_oversample; |
4223 | recip_h = 1.0f / spc->h_oversample; |
4224 | recip_v = 1.0f / spc->v_oversample; |
4225 | sub_x = stbtt__oversample_shift(spc->h_oversample); |
4226 | sub_y = stbtt__oversample_shift(spc->v_oversample); |
4227 | for (j=0; j < ranges[i].num_chars; ++j) { |
4228 | stbrp_rect *r = &rects[k]; |
4229 | if (r->was_packed && r->w != 0 && r->h != 0) { |
4230 | stbtt_packedchar *bc = &ranges[i].chardata_for_range[j]; |
4231 | int advance, lsb, x0,y0,x1,y1; |
4232 | int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j]; |
4233 | int glyph = stbtt_FindGlyphIndex(info, codepoint); |
4234 | stbrp_coord pad = (stbrp_coord) spc->padding; |
4235 | |
4236 | // pad on left and top |
4237 | r->x += pad; |
4238 | r->y += pad; |
4239 | r->w -= pad; |
4240 | r->h -= pad; |
4241 | stbtt_GetGlyphHMetrics(info, glyph, &advance, &lsb); |
4242 | stbtt_GetGlyphBitmapBox(info, glyph, |
4243 | scale * spc->h_oversample, |
4244 | scale * spc->v_oversample, |
4245 | &x0,&y0,&x1,&y1); |
4246 | stbtt_MakeGlyphBitmapSubpixel(info, |
4247 | spc->pixels + r->x + r->y*spc->stride_in_bytes, |
4248 | r->w - spc->h_oversample+1, |
4249 | r->h - spc->v_oversample+1, |
4250 | spc->stride_in_bytes, |
4251 | scale * spc->h_oversample, |
4252 | scale * spc->v_oversample, |
4253 | 0,0, |
4254 | glyph); |
4255 | |
4256 | if (spc->h_oversample > 1) |
4257 | stbtt__h_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes, |
4258 | r->w, r->h, spc->stride_in_bytes, |
4259 | spc->h_oversample); |
4260 | |
4261 | if (spc->v_oversample > 1) |
4262 | stbtt__v_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes, |
4263 | r->w, r->h, spc->stride_in_bytes, |
4264 | spc->v_oversample); |
4265 | |
4266 | bc->x0 = (stbtt_int16) r->x; |
4267 | bc->y0 = (stbtt_int16) r->y; |
4268 | bc->x1 = (stbtt_int16) (r->x + r->w); |
4269 | bc->y1 = (stbtt_int16) (r->y + r->h); |
4270 | bc->xadvance = scale * advance; |
4271 | bc->xoff = (float) x0 * recip_h + sub_x; |
4272 | bc->yoff = (float) y0 * recip_v + sub_y; |
4273 | bc->xoff2 = (x0 + r->w) * recip_h + sub_x; |
4274 | bc->yoff2 = (y0 + r->h) * recip_v + sub_y; |
4275 | |
4276 | if (glyph == 0) |
4277 | missing_glyph = j; |
4278 | } else if (spc->skip_missing) { |
4279 | return_value = 0; |
4280 | } else if (r->was_packed && r->w == 0 && r->h == 0 && missing_glyph >= 0) { |
4281 | ranges[i].chardata_for_range[j] = ranges[i].chardata_for_range[missing_glyph]; |
4282 | } else { |
4283 | return_value = 0; // if any fail, report failure |
4284 | } |
4285 | |
4286 | ++k; |
4287 | } |
4288 | } |
4289 | |
4290 | // restore original values |
4291 | spc->h_oversample = old_h_over; |
4292 | spc->v_oversample = old_v_over; |
4293 | |
4294 | return return_value; |
4295 | } |
4296 | |
4297 | STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects) |
4298 | { |
4299 | stbrp_pack_rects((stbrp_context *) spc->pack_info, rects, num_rects); |
4300 | } |
4301 | |
4302 | STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges) |
4303 | { |
4304 | stbtt_fontinfo info; |
4305 | int i,j,n, return_value = 1; |
4306 | //stbrp_context *context = (stbrp_context *) spc->pack_info; |
4307 | stbrp_rect *rects; |
4308 | |
4309 | // flag all characters as NOT packed |
4310 | for (i=0; i < num_ranges; ++i) |
4311 | for (j=0; j < ranges[i].num_chars; ++j) |
4312 | ranges[i].chardata_for_range[j].x0 = |
4313 | ranges[i].chardata_for_range[j].y0 = |
4314 | ranges[i].chardata_for_range[j].x1 = |
4315 | ranges[i].chardata_for_range[j].y1 = 0; |
4316 | |
4317 | n = 0; |
4318 | for (i=0; i < num_ranges; ++i) |
4319 | n += ranges[i].num_chars; |
4320 | |
4321 | rects = (stbrp_rect *) STBTT_malloc(sizeof(*rects) * n, spc->user_allocator_context); |
4322 | if (rects == NULL) |
4323 | return 0; |
4324 | |
4325 | info.userdata = spc->user_allocator_context; |
4326 | stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index)); |
4327 | |
4328 | n = stbtt_PackFontRangesGatherRects(spc, &info, ranges, num_ranges, rects); |
4329 | |
4330 | stbtt_PackFontRangesPackRects(spc, rects, n); |
4331 | |
4332 | return_value = stbtt_PackFontRangesRenderIntoRects(spc, &info, ranges, num_ranges, rects); |
4333 | |
4334 | STBTT_free(rects, spc->user_allocator_context); |
4335 | return return_value; |
4336 | } |
4337 | |
4338 | STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size, |
4339 | int first_unicode_codepoint_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range) |
4340 | { |
4341 | stbtt_pack_range range; |
4342 | range.first_unicode_codepoint_in_range = first_unicode_codepoint_in_range; |
4343 | range.array_of_unicode_codepoints = NULL; |
4344 | range.num_chars = num_chars_in_range; |
4345 | range.chardata_for_range = chardata_for_range; |
4346 | range.font_size = font_size; |
4347 | return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1); |
4348 | } |
4349 | |
4350 | STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap) |
4351 | { |
4352 | int i_ascent, i_descent, i_lineGap; |
4353 | float scale; |
4354 | stbtt_fontinfo info; |
4355 | stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata, index)); |
4356 | scale = size > 0 ? stbtt_ScaleForPixelHeight(&info, size) : stbtt_ScaleForMappingEmToPixels(&info, -size); |
4357 | stbtt_GetFontVMetrics(&info, &i_ascent, &i_descent, &i_lineGap); |
4358 | *ascent = (float) i_ascent * scale; |
4359 | *descent = (float) i_descent * scale; |
4360 | *lineGap = (float) i_lineGap * scale; |
4361 | } |
4362 | |
4363 | STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer) |
4364 | { |
4365 | float ipw = 1.0f / pw, iph = 1.0f / ph; |
4366 | const stbtt_packedchar *b = chardata + char_index; |
4367 | |
4368 | if (align_to_integer) { |
4369 | float x = (float) STBTT_ifloor((*xpos + b->xoff) + 0.5f); |
4370 | float y = (float) STBTT_ifloor((*ypos + b->yoff) + 0.5f); |
4371 | q->x0 = x; |
4372 | q->y0 = y; |
4373 | q->x1 = x + b->xoff2 - b->xoff; |
4374 | q->y1 = y + b->yoff2 - b->yoff; |
4375 | } else { |
4376 | q->x0 = *xpos + b->xoff; |
4377 | q->y0 = *ypos + b->yoff; |
4378 | q->x1 = *xpos + b->xoff2; |
4379 | q->y1 = *ypos + b->yoff2; |
4380 | } |
4381 | |
4382 | q->s0 = b->x0 * ipw; |
4383 | q->t0 = b->y0 * iph; |
4384 | q->s1 = b->x1 * ipw; |
4385 | q->t1 = b->y1 * iph; |
4386 | |
4387 | *xpos += b->xadvance; |
4388 | } |
4389 | |
4390 | ////////////////////////////////////////////////////////////////////////////// |
4391 | // |
4392 | // sdf computation |
4393 | // |
4394 | |
4395 | #define STBTT_min(a,b) ((a) < (b) ? (a) : (b)) |
4396 | #define STBTT_max(a,b) ((a) < (b) ? (b) : (a)) |
4397 | |
4398 | static int stbtt__ray_intersect_bezier(float orig[2], float ray[2], float q0[2], float q1[2], float q2[2], float hits[2][2]) |
4399 | { |
4400 | float q0perp = q0[1]*ray[0] - q0[0]*ray[1]; |
4401 | float q1perp = q1[1]*ray[0] - q1[0]*ray[1]; |
4402 | float q2perp = q2[1]*ray[0] - q2[0]*ray[1]; |
4403 | float roperp = orig[1]*ray[0] - orig[0]*ray[1]; |
4404 | |
4405 | float a = q0perp - 2*q1perp + q2perp; |
4406 | float b = q1perp - q0perp; |
4407 | float c = q0perp - roperp; |
4408 | |
4409 | float s0 = 0., s1 = 0.; |
4410 | int num_s = 0; |
4411 | |
4412 | if (a != 0.0) { |
4413 | float discr = b*b - a*c; |
4414 | if (discr > 0.0) { |
4415 | float rcpna = -1 / a; |
4416 | float d = (float) STBTT_sqrt(discr); |
4417 | s0 = (b+d) * rcpna; |
4418 | s1 = (b-d) * rcpna; |
4419 | if (s0 >= 0.0 && s0 <= 1.0) |
4420 | num_s = 1; |
4421 | if (d > 0.0 && s1 >= 0.0 && s1 <= 1.0) { |
4422 | if (num_s == 0) s0 = s1; |
4423 | ++num_s; |
4424 | } |
4425 | } |
4426 | } else { |
4427 | // 2*b*s + c = 0 |
4428 | // s = -c / (2*b) |
4429 | s0 = c / (-2 * b); |
4430 | if (s0 >= 0.0 && s0 <= 1.0) |
4431 | num_s = 1; |
4432 | } |
4433 | |
4434 | if (num_s == 0) |
4435 | return 0; |
4436 | else { |
4437 | float rcp_len2 = 1 / (ray[0]*ray[0] + ray[1]*ray[1]); |
4438 | float rayn_x = ray[0] * rcp_len2, rayn_y = ray[1] * rcp_len2; |
4439 | |
4440 | float q0d = q0[0]*rayn_x + q0[1]*rayn_y; |
4441 | float q1d = q1[0]*rayn_x + q1[1]*rayn_y; |
4442 | float q2d = q2[0]*rayn_x + q2[1]*rayn_y; |
4443 | float rod = orig[0]*rayn_x + orig[1]*rayn_y; |
4444 | |
4445 | float q10d = q1d - q0d; |
4446 | float q20d = q2d - q0d; |
4447 | float q0rd = q0d - rod; |
4448 | |
4449 | hits[0][0] = q0rd + s0*(2.0f - 2.0f*s0)*q10d + s0*s0*q20d; |
4450 | hits[0][1] = a*s0+b; |
4451 | |
4452 | if (num_s > 1) { |
4453 | hits[1][0] = q0rd + s1*(2.0f - 2.0f*s1)*q10d + s1*s1*q20d; |
4454 | hits[1][1] = a*s1+b; |
4455 | return 2; |
4456 | } else { |
4457 | return 1; |
4458 | } |
4459 | } |
4460 | } |
4461 | |
4462 | static int equal(float *a, float *b) |
4463 | { |
4464 | return (a[0] == b[0] && a[1] == b[1]); |
4465 | } |
4466 | |
4467 | static int stbtt__compute_crossings_x(float x, float y, int nverts, stbtt_vertex *verts) |
4468 | { |
4469 | int i; |
4470 | float orig[2], ray[2] = { 1, 0 }; |
4471 | float y_frac; |
4472 | int winding = 0; |
4473 | |
4474 | // make sure y never passes through a vertex of the shape |
4475 | y_frac = (float) STBTT_fmod(y, 1.0f); |
4476 | if (y_frac < 0.01f) |
4477 | y += 0.01f; |
4478 | else if (y_frac > 0.99f) |
4479 | y -= 0.01f; |
4480 | |
4481 | orig[0] = x; |
4482 | orig[1] = y; |
4483 | |
4484 | // test a ray from (-infinity,y) to (x,y) |
4485 | for (i=0; i < nverts; ++i) { |
4486 | if (verts[i].type == STBTT_vline) { |
4487 | int x0 = (int) verts[i-1].x, y0 = (int) verts[i-1].y; |
4488 | int x1 = (int) verts[i ].x, y1 = (int) verts[i ].y; |
4489 | if (y > STBTT_min(y0,y1) && y < STBTT_max(y0,y1) && x > STBTT_min(x0,x1)) { |
4490 | float x_inter = (y - y0) / (y1 - y0) * (x1-x0) + x0; |
4491 | if (x_inter < x) |
4492 | winding += (y0 < y1) ? 1 : -1; |
4493 | } |
4494 | } |
4495 | if (verts[i].type == STBTT_vcurve) { |
4496 | int x0 = (int) verts[i-1].x , y0 = (int) verts[i-1].y ; |
4497 | int x1 = (int) verts[i ].cx, y1 = (int) verts[i ].cy; |
4498 | int x2 = (int) verts[i ].x , y2 = (int) verts[i ].y ; |
4499 | int ax = STBTT_min(x0,STBTT_min(x1,x2)), ay = STBTT_min(y0,STBTT_min(y1,y2)); |
4500 | int by = STBTT_max(y0,STBTT_max(y1,y2)); |
4501 | if (y > ay && y < by && x > ax) { |
4502 | float q0[2],q1[2],q2[2]; |
4503 | float hits[2][2]; |
4504 | q0[0] = (float)x0; |
4505 | q0[1] = (float)y0; |
4506 | q1[0] = (float)x1; |
4507 | q1[1] = (float)y1; |
4508 | q2[0] = (float)x2; |
4509 | q2[1] = (float)y2; |
4510 | if (equal(q0,q1) || equal(q1,q2)) { |
4511 | x0 = (int)verts[i-1].x; |
4512 | y0 = (int)verts[i-1].y; |
4513 | x1 = (int)verts[i ].x; |
4514 | y1 = (int)verts[i ].y; |
4515 | if (y > STBTT_min(y0,y1) && y < STBTT_max(y0,y1) && x > STBTT_min(x0,x1)) { |
4516 | float x_inter = (y - y0) / (y1 - y0) * (x1-x0) + x0; |
4517 | if (x_inter < x) |
4518 | winding += (y0 < y1) ? 1 : -1; |
4519 | } |
4520 | } else { |
4521 | int num_hits = stbtt__ray_intersect_bezier(orig, ray, q0, q1, q2, hits); |
4522 | if (num_hits >= 1) |
4523 | if (hits[0][0] < 0) |
4524 | winding += (hits[0][1] < 0 ? -1 : 1); |
4525 | if (num_hits >= 2) |
4526 | if (hits[1][0] < 0) |
4527 | winding += (hits[1][1] < 0 ? -1 : 1); |
4528 | } |
4529 | } |
4530 | } |
4531 | } |
4532 | return winding; |
4533 | } |
4534 | |
4535 | static float stbtt__cuberoot( float x ) |
4536 | { |
4537 | if (x<0) |
4538 | return -(float) STBTT_pow(-x,1.0f/3.0f); |
4539 | else |
4540 | return (float) STBTT_pow( x,1.0f/3.0f); |
4541 | } |
4542 | |
4543 | // x^3 + a*x^2 + b*x + c = 0 |
4544 | static int stbtt__solve_cubic(float a, float b, float c, float* r) |
4545 | { |
4546 | float s = -a / 3; |
4547 | float p = b - a*a / 3; |
4548 | float q = a * (2*a*a - 9*b) / 27 + c; |
4549 | float p3 = p*p*p; |
4550 | float d = q*q + 4*p3 / 27; |
4551 | if (d >= 0) { |
4552 | float z = (float) STBTT_sqrt(d); |
4553 | float u = (-q + z) / 2; |
4554 | float v = (-q - z) / 2; |
4555 | u = stbtt__cuberoot(u); |
4556 | v = stbtt__cuberoot(v); |
4557 | r[0] = s + u + v; |
4558 | return 1; |
4559 | } else { |
4560 | float u = (float) STBTT_sqrt(-p/3); |
4561 | float v = (float) STBTT_acos(-STBTT_sqrt(-27/p3) * q / 2) / 3; // p3 must be negative, since d is negative |
4562 | float m = (float) STBTT_cos(v); |
4563 | float n = (float) STBTT_cos(v-3.141592/2)*1.732050808f; |
4564 | r[0] = s + u * 2 * m; |
4565 | r[1] = s - u * (m + n); |
4566 | r[2] = s - u * (m - n); |
4567 | |
4568 | //STBTT_assert( STBTT_fabs(((r[0]+a)*r[0]+b)*r[0]+c) < 0.05f); // these asserts may not be safe at all scales, though they're in bezier t parameter units so maybe? |
4569 | //STBTT_assert( STBTT_fabs(((r[1]+a)*r[1]+b)*r[1]+c) < 0.05f); |
4570 | //STBTT_assert( STBTT_fabs(((r[2]+a)*r[2]+b)*r[2]+c) < 0.05f); |
4571 | return 3; |
4572 | } |
4573 | } |
4574 | |
4575 | STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff) |
4576 | { |
4577 | float scale_x = scale, scale_y = scale; |
4578 | int ix0,iy0,ix1,iy1; |
4579 | int w,h; |
4580 | unsigned char *data; |
4581 | |
4582 | if (scale == 0) return NULL; |
4583 | |
4584 | stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale, scale, 0.0f,0.0f, &ix0,&iy0,&ix1,&iy1); |
4585 | |
4586 | // if empty, return NULL |
4587 | if (ix0 == ix1 || iy0 == iy1) |
4588 | return NULL; |
4589 | |
4590 | ix0 -= padding; |
4591 | iy0 -= padding; |
4592 | ix1 += padding; |
4593 | iy1 += padding; |
4594 | |
4595 | w = (ix1 - ix0); |
4596 | h = (iy1 - iy0); |
4597 | |
4598 | if (width ) *width = w; |
4599 | if (height) *height = h; |
4600 | if (xoff ) *xoff = ix0; |
4601 | if (yoff ) *yoff = iy0; |
4602 | |
4603 | // invert for y-downwards bitmaps |
4604 | scale_y = -scale_y; |
4605 | |
4606 | { |
4607 | int x,y,i,j; |
4608 | float *precompute; |
4609 | stbtt_vertex *verts; |
4610 | int num_verts = stbtt_GetGlyphShape(info, glyph, &verts); |
4611 | data = (unsigned char *) STBTT_malloc(w * h, info->userdata); |
4612 | precompute = (float *) STBTT_malloc(num_verts * sizeof(float), info->userdata); |
4613 | |
4614 | for (i=0,j=num_verts-1; i < num_verts; j=i++) { |
4615 | if (verts[i].type == STBTT_vline) { |
4616 | float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y; |
4617 | float x1 = verts[j].x*scale_x, y1 = verts[j].y*scale_y; |
4618 | float dist = (float) STBTT_sqrt((x1-x0)*(x1-x0) + (y1-y0)*(y1-y0)); |
4619 | precompute[i] = (dist == 0) ? 0.0f : 1.0f / dist; |
4620 | } else if (verts[i].type == STBTT_vcurve) { |
4621 | float x2 = verts[j].x *scale_x, y2 = verts[j].y *scale_y; |
4622 | float x1 = verts[i].cx*scale_x, y1 = verts[i].cy*scale_y; |
4623 | float x0 = verts[i].x *scale_x, y0 = verts[i].y *scale_y; |
4624 | float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2; |
4625 | float len2 = bx*bx + by*by; |
4626 | if (len2 != 0.0f) |
4627 | precompute[i] = 1.0f / (bx*bx + by*by); |
4628 | else |
4629 | precompute[i] = 0.0f; |
4630 | } else |
4631 | precompute[i] = 0.0f; |
4632 | } |
4633 | |
4634 | for (y=iy0; y < iy1; ++y) { |
4635 | for (x=ix0; x < ix1; ++x) { |
4636 | float val; |
4637 | float min_dist = 999999.0f; |
4638 | float sx = (float) x + 0.5f; |
4639 | float sy = (float) y + 0.5f; |
4640 | float x_gspace = (sx / scale_x); |
4641 | float y_gspace = (sy / scale_y); |
4642 | |
4643 | int winding = stbtt__compute_crossings_x(x_gspace, y_gspace, num_verts, verts); // @OPTIMIZE: this could just be a rasterization, but needs to be line vs. non-tesselated curves so a new path |
4644 | |
4645 | for (i=0; i < num_verts; ++i) { |
4646 | float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y; |
4647 | |
4648 | if (verts[i].type == STBTT_vline && precompute[i] != 0.0f) { |
4649 | float x1 = verts[i-1].x*scale_x, y1 = verts[i-1].y*scale_y; |
4650 | |
4651 | float dist,dist2 = (x0-sx)*(x0-sx) + (y0-sy)*(y0-sy); |
4652 | if (dist2 < min_dist*min_dist) |
4653 | min_dist = (float) STBTT_sqrt(dist2); |
4654 | |
4655 | // coarse culling against bbox |
4656 | //if (sx > STBTT_min(x0,x1)-min_dist && sx < STBTT_max(x0,x1)+min_dist && |
4657 | // sy > STBTT_min(y0,y1)-min_dist && sy < STBTT_max(y0,y1)+min_dist) |
4658 | dist = (float) STBTT_fabs((x1-x0)*(y0-sy) - (y1-y0)*(x0-sx)) * precompute[i]; |
4659 | STBTT_assert(i != 0); |
4660 | if (dist < min_dist) { |
4661 | // check position along line |
4662 | // x' = x0 + t*(x1-x0), y' = y0 + t*(y1-y0) |
4663 | // minimize (x'-sx)*(x'-sx)+(y'-sy)*(y'-sy) |
4664 | float dx = x1-x0, dy = y1-y0; |
4665 | float px = x0-sx, py = y0-sy; |
4666 | // minimize (px+t*dx)^2 + (py+t*dy)^2 = px*px + 2*px*dx*t + t^2*dx*dx + py*py + 2*py*dy*t + t^2*dy*dy |
4667 | // derivative: 2*px*dx + 2*py*dy + (2*dx*dx+2*dy*dy)*t, set to 0 and solve |
4668 | float t = -(px*dx + py*dy) / (dx*dx + dy*dy); |
4669 | if (t >= 0.0f && t <= 1.0f) |
4670 | min_dist = dist; |
4671 | } |
4672 | } else if (verts[i].type == STBTT_vcurve) { |
4673 | float x2 = verts[i-1].x *scale_x, y2 = verts[i-1].y *scale_y; |
4674 | float x1 = verts[i ].cx*scale_x, y1 = verts[i ].cy*scale_y; |
4675 | float box_x0 = STBTT_min(STBTT_min(x0,x1),x2); |
4676 | float box_y0 = STBTT_min(STBTT_min(y0,y1),y2); |
4677 | float box_x1 = STBTT_max(STBTT_max(x0,x1),x2); |
4678 | float box_y1 = STBTT_max(STBTT_max(y0,y1),y2); |
4679 | // coarse culling against bbox to avoid computing cubic unnecessarily |
4680 | if (sx > box_x0-min_dist && sx < box_x1+min_dist && sy > box_y0-min_dist && sy < box_y1+min_dist) { |
4681 | int num=0; |
4682 | float ax = x1-x0, ay = y1-y0; |
4683 | float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2; |
4684 | float mx = x0 - sx, my = y0 - sy; |
4685 | float res[3] = {0.f,0.f,0.f}; |
4686 | float px,py,t,it,dist2; |
4687 | float a_inv = precompute[i]; |
4688 | if (a_inv == 0.0) { // if a_inv is 0, it's 2nd degree so use quadratic formula |
4689 | float a = 3*(ax*bx + ay*by); |
4690 | float b = 2*(ax*ax + ay*ay) + (mx*bx+my*by); |
4691 | float c = mx*ax+my*ay; |
4692 | if (a == 0.0) { // if a is 0, it's linear |
4693 | if (b != 0.0) { |
4694 | res[num++] = -c/b; |
4695 | } |
4696 | } else { |
4697 | float discriminant = b*b - 4*a*c; |
4698 | if (discriminant < 0) |
4699 | num = 0; |
4700 | else { |
4701 | float root = (float) STBTT_sqrt(discriminant); |
4702 | res[0] = (-b - root)/(2*a); |
4703 | res[1] = (-b + root)/(2*a); |
4704 | num = 2; // don't bother distinguishing 1-solution case, as code below will still work |
4705 | } |
4706 | } |
4707 | } else { |
4708 | float b = 3*(ax*bx + ay*by) * a_inv; // could precompute this as it doesn't depend on sample point |
4709 | float c = (2*(ax*ax + ay*ay) + (mx*bx+my*by)) * a_inv; |
4710 | float d = (mx*ax+my*ay) * a_inv; |
4711 | num = stbtt__solve_cubic(b, c, d, res); |
4712 | } |
4713 | dist2 = (x0-sx)*(x0-sx) + (y0-sy)*(y0-sy); |
4714 | if (dist2 < min_dist*min_dist) |
4715 | min_dist = (float) STBTT_sqrt(dist2); |
4716 | |
4717 | if (num >= 1 && res[0] >= 0.0f && res[0] <= 1.0f) { |
4718 | t = res[0], it = 1.0f - t; |
4719 | px = it*it*x0 + 2*t*it*x1 + t*t*x2; |
4720 | py = it*it*y0 + 2*t*it*y1 + t*t*y2; |
4721 | dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy); |
4722 | if (dist2 < min_dist * min_dist) |
4723 | min_dist = (float) STBTT_sqrt(dist2); |
4724 | } |
4725 | if (num >= 2 && res[1] >= 0.0f && res[1] <= 1.0f) { |
4726 | t = res[1], it = 1.0f - t; |
4727 | px = it*it*x0 + 2*t*it*x1 + t*t*x2; |
4728 | py = it*it*y0 + 2*t*it*y1 + t*t*y2; |
4729 | dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy); |
4730 | if (dist2 < min_dist * min_dist) |
4731 | min_dist = (float) STBTT_sqrt(dist2); |
4732 | } |
4733 | if (num >= 3 && res[2] >= 0.0f && res[2] <= 1.0f) { |
4734 | t = res[2], it = 1.0f - t; |
4735 | px = it*it*x0 + 2*t*it*x1 + t*t*x2; |
4736 | py = it*it*y0 + 2*t*it*y1 + t*t*y2; |
4737 | dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy); |
4738 | if (dist2 < min_dist * min_dist) |
4739 | min_dist = (float) STBTT_sqrt(dist2); |
4740 | } |
4741 | } |
4742 | } |
4743 | } |
4744 | if (winding == 0) |
4745 | min_dist = -min_dist; // if outside the shape, value is negative |
4746 | val = onedge_value + pixel_dist_scale * min_dist; |
4747 | if (val < 0) |
4748 | val = 0; |
4749 | else if (val > 255) |
4750 | val = 255; |
4751 | data[(y-iy0)*w+(x-ix0)] = (unsigned char) val; |
4752 | } |
4753 | } |
4754 | STBTT_free(precompute, info->userdata); |
4755 | STBTT_free(verts, info->userdata); |
4756 | } |
4757 | return data; |
4758 | } |
4759 | |
4760 | STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff) |
4761 | { |
4762 | return stbtt_GetGlyphSDF(info, scale, stbtt_FindGlyphIndex(info, codepoint), padding, onedge_value, pixel_dist_scale, width, height, xoff, yoff); |
4763 | } |
4764 | |
4765 | STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata) |
4766 | { |
4767 | STBTT_free(bitmap, userdata); |
4768 | } |
4769 | |
4770 | ////////////////////////////////////////////////////////////////////////////// |
4771 | // |
4772 | // font name matching -- recommended not to use this |
4773 | // |
4774 | |
4775 | // check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string |
4776 | static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(stbtt_uint8 *s1, stbtt_int32 len1, stbtt_uint8 *s2, stbtt_int32 len2) |
4777 | { |
4778 | stbtt_int32 i=0; |
4779 | |
4780 | // convert utf16 to utf8 and compare the results while converting |
4781 | while (len2) { |
4782 | stbtt_uint16 ch = s2[0]*256 + s2[1]; |
4783 | if (ch < 0x80) { |
4784 | if (i >= len1) return -1; |
4785 | if (s1[i++] != ch) return -1; |
4786 | } else if (ch < 0x800) { |
4787 | if (i+1 >= len1) return -1; |
4788 | if (s1[i++] != 0xc0 + (ch >> 6)) return -1; |
4789 | if (s1[i++] != 0x80 + (ch & 0x3f)) return -1; |
4790 | } else if (ch >= 0xd800 && ch < 0xdc00) { |
4791 | stbtt_uint32 c; |
4792 | stbtt_uint16 ch2 = s2[2]*256 + s2[3]; |
4793 | if (i+3 >= len1) return -1; |
4794 | c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000; |
4795 | if (s1[i++] != 0xf0 + (c >> 18)) return -1; |
4796 | if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1; |
4797 | if (s1[i++] != 0x80 + ((c >> 6) & 0x3f)) return -1; |
4798 | if (s1[i++] != 0x80 + ((c ) & 0x3f)) return -1; |
4799 | s2 += 2; // plus another 2 below |
4800 | len2 -= 2; |
4801 | } else if (ch >= 0xdc00 && ch < 0xe000) { |
4802 | return -1; |
4803 | } else { |
4804 | if (i+2 >= len1) return -1; |
4805 | if (s1[i++] != 0xe0 + (ch >> 12)) return -1; |
4806 | if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1; |
4807 | if (s1[i++] != 0x80 + ((ch ) & 0x3f)) return -1; |
4808 | } |
4809 | s2 += 2; |
4810 | len2 -= 2; |
4811 | } |
4812 | return i; |
4813 | } |
4814 | |
4815 | static int stbtt_CompareUTF8toUTF16_bigendian_internal(char *s1, int len1, char *s2, int len2) |
4816 | { |
4817 | return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((stbtt_uint8*) s1, len1, (stbtt_uint8*) s2, len2); |
4818 | } |
4819 | |
4820 | // returns results in whatever encoding you request... but note that 2-byte encodings |
4821 | // will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare |
4822 | STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID) |
4823 | { |
4824 | stbtt_int32 i,count,stringOffset; |
4825 | stbtt_uint8 *fc = font->data; |
4826 | stbtt_uint32 offset = font->fontstart; |
4827 | stbtt_uint32 nm = stbtt__find_table(fc, offset, "name"); |
4828 | if (!nm) return NULL; |
4829 | |
4830 | count = ttUSHORT(fc+nm+2); |
4831 | stringOffset = nm + ttUSHORT(fc+nm+4); |
4832 | for (i=0; i < count; ++i) { |
4833 | stbtt_uint32 loc = nm + 6 + 12 * i; |
4834 | if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2) |
4835 | && languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) { |
4836 | *length = ttUSHORT(fc+loc+8); |
4837 | return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10)); |
4838 | } |
4839 | } |
4840 | return NULL; |
4841 | } |
4842 | |
4843 | static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id) |
4844 | { |
4845 | stbtt_int32 i; |
4846 | stbtt_int32 count = ttUSHORT(fc+nm+2); |
4847 | stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4); |
4848 | |
4849 | for (i=0; i < count; ++i) { |
4850 | stbtt_uint32 loc = nm + 6 + 12 * i; |
4851 | stbtt_int32 id = ttUSHORT(fc+loc+6); |
4852 | if (id == target_id) { |
4853 | // find the encoding |
4854 | stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4); |
4855 | |
4856 | // is this a Unicode encoding? |
4857 | if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) { |
4858 | stbtt_int32 slen = ttUSHORT(fc+loc+8); |
4859 | stbtt_int32 off = ttUSHORT(fc+loc+10); |
4860 | |
4861 | // check if there's a prefix match |
4862 | stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen); |
4863 | if (matchlen >= 0) { |
4864 | // check for target_id+1 immediately following, with same encoding & language |
4865 | 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) { |
4866 | slen = ttUSHORT(fc+loc+12+8); |
4867 | off = ttUSHORT(fc+loc+12+10); |
4868 | if (slen == 0) { |
4869 | if (matchlen == nlen) |
4870 | return 1; |
4871 | } else if (matchlen < nlen && name[matchlen] == ' ') { |
4872 | ++matchlen; |
4873 | if (stbtt_CompareUTF8toUTF16_bigendian_internal((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen)) |
4874 | return 1; |
4875 | } |
4876 | } else { |
4877 | // if nothing immediately following |
4878 | if (matchlen == nlen) |
4879 | return 1; |
4880 | } |
4881 | } |
4882 | } |
4883 | |
4884 | // @TODO handle other encodings |
4885 | } |
4886 | } |
4887 | return 0; |
4888 | } |
4889 | |
4890 | static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags) |
4891 | { |
4892 | stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name); |
4893 | stbtt_uint32 nm,hd; |
4894 | if (!stbtt__isfont(fc+offset)) return 0; |
4895 | |
4896 | // check italics/bold/underline flags in macStyle... |
4897 | if (flags) { |
4898 | hd = stbtt__find_table(fc, offset, "head"); |
4899 | if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0; |
4900 | } |
4901 | |
4902 | nm = stbtt__find_table(fc, offset, "name"); |
4903 | if (!nm) return 0; |
4904 | |
4905 | if (flags) { |
4906 | // if we checked the macStyle flags, then just check the family and ignore the subfamily |
4907 | if (stbtt__matchpair(fc, nm, name, nlen, 16, -1)) return 1; |
4908 | if (stbtt__matchpair(fc, nm, name, nlen, 1, -1)) return 1; |
4909 | if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1; |
4910 | } else { |
4911 | if (stbtt__matchpair(fc, nm, name, nlen, 16, 17)) return 1; |
4912 | if (stbtt__matchpair(fc, nm, name, nlen, 1, 2)) return 1; |
4913 | if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1; |
4914 | } |
4915 | |
4916 | return 0; |
4917 | } |
4918 | |
4919 | static int stbtt_FindMatchingFont_internal(unsigned char *font_collection, char *name_utf8, stbtt_int32 flags) |
4920 | { |
4921 | stbtt_int32 i; |
4922 | for (i=0;;++i) { |
4923 | stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i); |
4924 | if (off < 0) return off; |
4925 | if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags)) |
4926 | return off; |
4927 | } |
4928 | } |
4929 | |
4930 | #if defined(__GNUC__) || defined(__clang__) |
4931 | #pragma GCC diagnostic push |
4932 | #pragma GCC diagnostic ignored "-Wcast-qual" |
4933 | #endif |
4934 | |
4935 | STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, |
4936 | float pixel_height, unsigned char *pixels, int pw, int ph, |
4937 | int first_char, int num_chars, stbtt_bakedchar *chardata) |
4938 | { |
4939 | return stbtt_BakeFontBitmap_internal((unsigned char *) data, offset, pixel_height, pixels, pw, ph, first_char, num_chars, chardata); |
4940 | } |
4941 | |
4942 | STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index) |
4943 | { |
4944 | return stbtt_GetFontOffsetForIndex_internal((unsigned char *) data, index); |
4945 | } |
4946 | |
4947 | STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data) |
4948 | { |
4949 | return stbtt_GetNumberOfFonts_internal((unsigned char *) data); |
4950 | } |
4951 | |
4952 | STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset) |
4953 | { |
4954 | return stbtt_InitFont_internal(info, (unsigned char *) data, offset); |
4955 | } |
4956 | |
4957 | STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags) |
4958 | { |
4959 | return stbtt_FindMatchingFont_internal((unsigned char *) fontdata, (char *) name, flags); |
4960 | } |
4961 | |
4962 | STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2) |
4963 | { |
4964 | return stbtt_CompareUTF8toUTF16_bigendian_internal((char *) s1, len1, (char *) s2, len2); |
4965 | } |
4966 | |
4967 | #if defined(__GNUC__) || defined(__clang__) |
4968 | #pragma GCC diagnostic pop |
4969 | #endif |
4970 | |
4971 | #endif // STB_TRUETYPE_IMPLEMENTATION |
4972 | |
4973 | |
4974 | // FULL VERSION HISTORY |
4975 | // |
4976 | // 1.25 (2021-07-11) many fixes |
4977 | // 1.24 (2020-02-05) fix warning |
4978 | // 1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS) |
4979 | // 1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined |
4980 | // 1.21 (2019-02-25) fix warning |
4981 | // 1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics() |
4982 | // 1.19 (2018-02-11) OpenType GPOS kerning (horizontal only), STBTT_fmod |
4983 | // 1.18 (2018-01-29) add missing function |
4984 | // 1.17 (2017-07-23) make more arguments const; doc fix |
4985 | // 1.16 (2017-07-12) SDF support |
4986 | // 1.15 (2017-03-03) make more arguments const |
4987 | // 1.14 (2017-01-16) num-fonts-in-TTC function |
4988 | // 1.13 (2017-01-02) support OpenType fonts, certain Apple fonts |
4989 | // 1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual |
4990 | // 1.11 (2016-04-02) fix unused-variable warning |
4991 | // 1.10 (2016-04-02) allow user-defined fabs() replacement |
4992 | // fix memory leak if fontsize=0.0 |
4993 | // fix warning from duplicate typedef |
4994 | // 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use alloc userdata for PackFontRanges |
4995 | // 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges |
4996 | // 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints; |
4997 | // allow PackFontRanges to pack and render in separate phases; |
4998 | // fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?); |
4999 | // fixed an assert() bug in the new rasterizer |
5000 | // replace assert() with STBTT_assert() in new rasterizer |
5001 | // 1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine) |
5002 | // also more precise AA rasterizer, except if shapes overlap |
5003 | // remove need for STBTT_sort |
5004 | // 1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC |
5005 | // 1.04 (2015-04-15) typo in example |
5006 | // 1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes |
5007 | // 1.02 (2014-12-10) fix various warnings & compile issues w/ stb_rect_pack, C++ |
5008 | // 1.01 (2014-12-08) fix subpixel position when oversampling to exactly match |
5009 | // non-oversampled; STBTT_POINT_SIZE for packed case only |
5010 | // 1.00 (2014-12-06) add new PackBegin etc. API, w/ support for oversampling |
5011 | // 0.99 (2014-09-18) fix multiple bugs with subpixel rendering (ryg) |
5012 | // 0.9 (2014-08-07) support certain mac/iOS fonts without an MS platformID |
5013 | // 0.8b (2014-07-07) fix a warning |
5014 | // 0.8 (2014-05-25) fix a few more warnings |
5015 | // 0.7 (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back |
5016 | // 0.6c (2012-07-24) improve documentation |
5017 | // 0.6b (2012-07-20) fix a few more warnings |
5018 | // 0.6 (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels, |
5019 | // stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty |
5020 | // 0.5 (2011-12-09) bugfixes: |
5021 | // subpixel glyph renderer computed wrong bounding box |
5022 | // first vertex of shape can be off-curve (FreeSans) |
5023 | // 0.4b (2011-12-03) fixed an error in the font baking example |
5024 | // 0.4 (2011-12-01) kerning, subpixel rendering (tor) |
5025 | // bugfixes for: |
5026 | // codepoint-to-glyph conversion using table fmt=12 |
5027 | // codepoint-to-glyph conversion using table fmt=4 |
5028 | // stbtt_GetBakedQuad with non-square texture (Zer) |
5029 | // updated Hello World! sample to use kerning and subpixel |
5030 | // fixed some warnings |
5031 | // 0.3 (2009-06-24) cmap fmt=12, compound shapes (MM) |
5032 | // userdata, malloc-from-userdata, non-zero fill (stb) |
5033 | // 0.2 (2009-03-11) Fix unsigned/signed char warnings |
5034 | // 0.1 (2009-03-09) First public release |
5035 | // |
5036 | |
5037 | /* |
5038 | ------------------------------------------------------------------------------ |
5039 | This software is available under 2 licenses -- choose whichever you prefer. |
5040 | ------------------------------------------------------------------------------ |
5041 | ALTERNATIVE A - MIT License |
5042 | Copyright (c) 2017 Sean Barrett |
5043 | Permission is hereby granted, free of charge, to any person obtaining a copy of |
5044 | this software and associated documentation files (the "Software"), to deal in |
5045 | the Software without restriction, including without limitation the rights to |
5046 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
5047 | of the Software, and to permit persons to whom the Software is furnished to do |
5048 | so, subject to the following conditions: |
5049 | The above copyright notice and this permission notice shall be included in all |
5050 | copies or substantial portions of the Software. |
5051 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
5052 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
5053 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
5054 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
5055 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
5056 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
5057 | SOFTWARE. |
5058 | ------------------------------------------------------------------------------ |
5059 | ALTERNATIVE B - Public Domain (www.unlicense.org) |
5060 | This is free and unencumbered software released into the public domain. |
5061 | Anyone is free to copy, modify, publish, use, compile, sell, or distribute this |
5062 | software, either in source code form or as a compiled binary, for any purpose, |
5063 | commercial or non-commercial, and by any means. |
5064 | In jurisdictions that recognize copyright laws, the author or authors of this |
5065 | software dedicate any and all copyright interest in the software to the public |
5066 | domain. We make this dedication for the benefit of the public at large and to |
5067 | the detriment of our heirs and successors. We intend this dedication to be an |
5068 | overt act of relinquishment in perpetuity of all present and future rights to |
5069 | this software under copyright law. |
5070 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
5071 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
5072 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
5073 | AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
5074 | ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
5075 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
5076 | ------------------------------------------------------------------------------ |
5077 | */ |