1 /*
2 * Copyright © 2011,2014 Google, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod, Roozbeh Pournader
25 */
26
27 #include "hb-private.hh"
28
29 #include "hb-ot.h"
30
31 #include "hb-font-private.hh"
32
33 #include "hb-ot-cmap-table.hh"
34 #include "hb-ot-cbdt-table.hh"
35 #include "hb-ot-glyf-table.hh"
36 #include "hb-ot-head-table.hh"
37 #include "hb-ot-hhea-table.hh"
38 #include "hb-ot-hmtx-table.hh"
39 #include "hb-ot-os2-table.hh"
40 //#include "hb-ot-post-table.hh"
41
42
43 struct hb_ot_face_metrics_accelerator_t
44 {
45 unsigned int num_metrics;
46 unsigned int num_advances;
47 unsigned int default_advance;
48 unsigned short ascender;
49 unsigned short descender;
50 unsigned short line_gap;
51 bool has_font_extents;
52
53 const OT::_mtx *table;
54 hb_blob_t *blob;
55
56 inline void init (hb_face_t *face,
57 hb_tag_t _hea_tag,
58 hb_tag_t _mtx_tag,
59 hb_tag_t os2_tag,
60 unsigned int default_advance = 0)
61 {
62 this->default_advance = default_advance ? default_advance : face->get_upem ();
63
64 bool got_font_extents = false;
65 if (os2_tag)
66 {
67 hb_blob_t *os2_blob = OT::Sanitizer<OT::os2>::sanitize (face->reference_table (os2_tag));
68 const OT::os2 *os2 = OT::Sanitizer<OT::os2>::lock_instance (os2_blob);
69 #define USE_TYPO_METRICS (1u<<7)
70 if (0 != (os2->fsSelection & USE_TYPO_METRICS))
71 {
72 this->ascender = os2->sTypoAscender;
73 this->descender = os2->sTypoDescender;
74 this->line_gap = os2->sTypoLineGap;
75 got_font_extents = (this->ascender | this->descender) != 0;
76 }
77 hb_blob_destroy (os2_blob);
78 }
79
80 hb_blob_t *_hea_blob = OT::Sanitizer<OT::_hea>::sanitize (face->reference_table (_hea_tag));
81 const OT::_hea *_hea = OT::Sanitizer<OT::_hea>::lock_instance (_hea_blob);
82 this->num_advances = _hea->numberOfLongMetrics;
83 if (!got_font_extents)
84 {
85 this->ascender = _hea->ascender;
86 this->descender = _hea->descender;
87 this->line_gap = _hea->lineGap;
88 got_font_extents = (this->ascender | this->descender) != 0;
89 }
90 hb_blob_destroy (_hea_blob);
91
92 this->has_font_extents = got_font_extents;
93
94 this->blob = OT::Sanitizer<OT::_mtx>::sanitize (face->reference_table (_mtx_tag));
95
96 /* Cap num_metrics() and num_advances() based on table length. */
97 unsigned int len = hb_blob_get_length (this->blob);
98 if (unlikely (this->num_advances * 4 > len))
99 this->num_advances = len / 4;
100 this->num_metrics = this->num_advances + (len - 4 * this->num_advances) / 2;
101
102 /* We MUST set num_metrics to zero if num_advances is zero.
103 * Our get_advance() depends on that. */
104 if (unlikely (!this->num_advances))
105 {
106 this->num_metrics = this->num_advances = 0;
107 hb_blob_destroy (this->blob);
108 this->blob = hb_blob_get_empty ();
109 }
110 this->table = OT::Sanitizer<OT::_mtx>::lock_instance (this->blob);
111 }
112
113 inline void fini (void)
114 {
115 hb_blob_destroy (this->blob);
116 }
117
118 inline unsigned int get_advance (hb_codepoint_t glyph) const
119 {
120 if (unlikely (glyph >= this->num_metrics))
121 {
122 /* If this->num_metrics is zero, it means we don't have the metrics table
123 * for this direction: return default advance. Otherwise, it means that the
124 * glyph index is out of bound: return zero. */
125 if (this->num_metrics)
126 return 0;
127 else
128 return this->default_advance;
129 }
130
131 if (glyph >= this->num_advances)
132 glyph = this->num_advances - 1;
133
134 return this->table->longMetric[glyph].advance;
135 }
136 };
137
138 struct hb_ot_face_glyf_accelerator_t
139 {
140 bool short_offset;
141 unsigned int num_glyphs;
142 const OT::loca *loca;
143 const OT::glyf *glyf;
144 hb_blob_t *loca_blob;
145 hb_blob_t *glyf_blob;
146 unsigned int glyf_len;
147
148 inline void init (hb_face_t *face)
149 {
150 hb_blob_t *head_blob = OT::Sanitizer<OT::head>::sanitize (face->reference_table (HB_OT_TAG_head));
151 const OT::head *head = OT::Sanitizer<OT::head>::lock_instance (head_blob);
152 if ((unsigned int) head->indexToLocFormat > 1 || head->glyphDataFormat != 0)
153 {
154 /* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */
155 hb_blob_destroy (head_blob);
156 return;
157 }
158 this->short_offset = 0 == head->indexToLocFormat;
159 hb_blob_destroy (head_blob);
160
161 this->loca_blob = OT::Sanitizer<OT::loca>::sanitize (face->reference_table (HB_OT_TAG_loca));
162 this->loca = OT::Sanitizer<OT::loca>::lock_instance (this->loca_blob);
163 this->glyf_blob = OT::Sanitizer<OT::glyf>::sanitize (face->reference_table (HB_OT_TAG_glyf));
164 this->glyf = OT::Sanitizer<OT::glyf>::lock_instance (this->glyf_blob);
165
166 this->num_glyphs = MAX (1u, hb_blob_get_length (this->loca_blob) / (this->short_offset ? 2 : 4)) - 1;
167 this->glyf_len = hb_blob_get_length (this->glyf_blob);
168 }
169
170 inline void fini (void)
171 {
172 hb_blob_destroy (this->loca_blob);
173 hb_blob_destroy (this->glyf_blob);
174 }
175
176 inline bool get_extents (hb_codepoint_t glyph,
177 hb_glyph_extents_t *extents) const
178 {
179 if (unlikely (glyph >= this->num_glyphs))
180 return false;
181
182 unsigned int start_offset, end_offset;
183 if (this->short_offset)
184 {
185 start_offset = 2 * this->loca->u.shortsZ[glyph];
186 end_offset = 2 * this->loca->u.shortsZ[glyph + 1];
187 }
188 else
189 {
190 start_offset = this->loca->u.longsZ[glyph];
191 end_offset = this->loca->u.longsZ[glyph + 1];
192 }
193
194 if (start_offset > end_offset || end_offset > this->glyf_len)
195 return false;
196
197 if (end_offset - start_offset < OT::glyfGlyphHeader::static_size)
198 return true; /* Empty glyph; zero extents. */
199
200 const OT::glyfGlyphHeader &glyph_header = OT::StructAtOffset<OT::glyfGlyphHeader> (this->glyf, start_offset);
201
202 extents->x_bearing = MIN (glyph_header.xMin, glyph_header.xMax);
203 extents->y_bearing = MAX (glyph_header.yMin, glyph_header.yMax);
204 extents->width = MAX (glyph_header.xMin, glyph_header.xMax) - extents->x_bearing;
205 extents->height = MIN (glyph_header.yMin, glyph_header.yMax) - extents->y_bearing;
206
207 return true;
208 }
209 };
210
211 struct hb_ot_face_cbdt_accelerator_t
212 {
213 hb_blob_t *cblc_blob;
214 hb_blob_t *cbdt_blob;
215 const OT::CBLC *cblc;
216 const OT::CBDT *cbdt;
217
218 unsigned int cbdt_len;
219 float upem;
220
221 inline void init (hb_face_t *face)
222 {
223 upem = face->get_upem();
224
225 cblc_blob = OT::Sanitizer<OT::CBLC>::sanitize (face->reference_table (HB_OT_TAG_CBLC));
226 cbdt_blob = OT::Sanitizer<OT::CBDT>::sanitize (face->reference_table (HB_OT_TAG_CBDT));
227 cbdt_len = hb_blob_get_length (cbdt_blob);
228
229 if (hb_blob_get_length (cblc_blob) == 0) {
230 cblc = NULL;
231 cbdt = NULL;
232 return; /* Not a bitmap font. */
233 }
234 cblc = OT::Sanitizer<OT::CBLC>::lock_instance (cblc_blob);
235 cbdt = OT::Sanitizer<OT::CBDT>::lock_instance (cbdt_blob);
236
237 }
238
239 inline void fini (void)
240 {
241 hb_blob_destroy (this->cblc_blob);
242 hb_blob_destroy (this->cbdt_blob);
243 }
244
245 inline bool get_extents (hb_codepoint_t glyph, hb_glyph_extents_t *extents) const
246 {
247 unsigned int x_ppem = upem, y_ppem = upem; /* TODO Use font ppem if available. */
248
249 if (cblc == NULL)
250 return false; // Not a color bitmap font.
251
252 const OT::IndexSubtableRecord *subtable_record = this->cblc->find_table(glyph, &x_ppem, &y_ppem);
253 if (subtable_record == NULL)
254 return false;
255
256 if (subtable_record->get_extents (extents))
257 return true;
258
259 unsigned int image_offset = 0, image_length = 0, image_format = 0;
260 if (!subtable_record->get_image_data (glyph, &image_offset, &image_length, &image_format))
261 return false;
262
263 {
264 /* TODO Move the following into CBDT struct when adding more formats. */
265
266 if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length))
267 return false;
268
269 switch (image_format)
270 {
271 case 17: {
272 if (unlikely (image_length < OT::GlyphBitmapDataFormat17::min_size))
273 return false;
274
275 const OT::GlyphBitmapDataFormat17& glyphFormat17 =
276 OT::StructAtOffset<OT::GlyphBitmapDataFormat17> (this->cbdt, image_offset);
277 glyphFormat17.glyphMetrics.get_extents (extents);
278 }
279 break;
280 default:
281 // TODO: Support other image formats.
282 return false;
283 }
284 }
285
286 /* Convert to the font units. */
287 extents->x_bearing *= upem / (float) x_ppem;
288 extents->y_bearing *= upem / (float) y_ppem;
289 extents->width *= upem / (float) x_ppem;
290 extents->height *= upem / (float) y_ppem;
291
292 return true;
293 }
294 };
295
296 typedef bool (*hb_cmap_get_glyph_func_t) (const void *obj,
297 hb_codepoint_t codepoint,
298 hb_codepoint_t *glyph);
299
300 template <typename Type>
301 static inline bool get_glyph_from (const void *obj,
302 hb_codepoint_t codepoint,
303 hb_codepoint_t *glyph)
304 {
305 const Type *typed_obj = (const Type *) obj;
306 return typed_obj->get_glyph (codepoint, glyph);
307 }
308
309 template <typename Type>
310 static inline bool get_glyph_from_symbol (const void *obj,
311 hb_codepoint_t codepoint,
312 hb_codepoint_t *glyph)
313 {
314 const Type *typed_obj = (const Type *) obj;
315 if (likely (typed_obj->get_glyph (codepoint, glyph)))
316 return true;
317
318 if (codepoint <= 0x00FFu)
319 {
320 /* For symbol-encoded OpenType fonts, we duplicate the
321 * U+F000..F0FF range at U+0000..U+00FF. That's what
322 * Windows seems to do, and that's hinted about at:
323 * http://www.microsoft.com/typography/otspec/recom.htm
324 * under "Non-Standard (Symbol) Fonts". */
325 return typed_obj->get_glyph (0xF000u + codepoint, glyph);
326 }
327
328 return false;
329 }
330
331 struct hb_ot_face_cmap_accelerator_t
332 {
333 hb_cmap_get_glyph_func_t get_glyph_func;
334 const void *get_glyph_data;
335 OT::CmapSubtableFormat4::accelerator_t format4_accel;
336
337 const OT::CmapSubtableFormat14 *uvs_table;
338 hb_blob_t *blob;
339
340 inline void init (hb_face_t *face)
341 {
342 this->blob = OT::Sanitizer<OT::cmap>::sanitize (face->reference_table (HB_OT_TAG_cmap));
343 const OT::cmap *cmap = OT::Sanitizer<OT::cmap>::lock_instance (this->blob);
344 const OT::CmapSubtable *subtable = NULL;
345 const OT::CmapSubtableFormat14 *subtable_uvs = NULL;
346
347 bool symbol = false;
348 /* 32-bit subtables. */
349 if (!subtable) subtable = cmap->find_subtable (3, 10);
350 if (!subtable) subtable = cmap->find_subtable (0, 6);
351 if (!subtable) subtable = cmap->find_subtable (0, 4);
352 /* 16-bit subtables. */
353 if (!subtable) subtable = cmap->find_subtable (3, 1);
354 if (!subtable) subtable = cmap->find_subtable (0, 3);
355 if (!subtable) subtable = cmap->find_subtable (0, 2);
356 if (!subtable) subtable = cmap->find_subtable (0, 1);
357 if (!subtable) subtable = cmap->find_subtable (0, 0);
358 if (!subtable)
359 {
360 subtable = cmap->find_subtable (3, 0);
361 if (subtable) symbol = true;
362 }
363 /* Meh. */
364 if (!subtable) subtable = &OT::Null(OT::CmapSubtable);
365
366 /* UVS subtable. */
367 if (!subtable_uvs)
368 {
369 const OT::CmapSubtable *st = cmap->find_subtable (0, 5);
370 if (st && st->u.format == 14)
371 subtable_uvs = &st->u.format14;
372 }
373 /* Meh. */
374 if (!subtable_uvs) subtable_uvs = &OT::Null(OT::CmapSubtableFormat14);
375
376 this->uvs_table = subtable_uvs;
377
378 this->get_glyph_data = subtable;
379 if (unlikely (symbol))
380 this->get_glyph_func = get_glyph_from_symbol<OT::CmapSubtable>;
381 else
382 switch (subtable->u.format) {
383 /* Accelerate format 4 and format 12. */
384 default: this->get_glyph_func = get_glyph_from<OT::CmapSubtable>; break;
385 case 12: this->get_glyph_func = get_glyph_from<OT::CmapSubtableFormat12>; break;
386 case 4:
387 {
388 this->format4_accel.init (&subtable->u.format4);
389 this->get_glyph_data = &this->format4_accel;
390 this->get_glyph_func = this->format4_accel.get_glyph_func;
391 }
392 break;
393 }
394 }
395
396 inline void fini (void)
397 {
398 hb_blob_destroy (this->blob);
399 }
400
401 inline bool get_nominal_glyph (hb_codepoint_t unicode,
402 hb_codepoint_t *glyph) const
403 {
404 return this->get_glyph_func (this->get_glyph_data, unicode, glyph);
405 }
406
407 inline bool get_variation_glyph (hb_codepoint_t unicode,
408 hb_codepoint_t variation_selector,
409 hb_codepoint_t *glyph) const
410 {
411 switch (this->uvs_table->get_glyph_variant (unicode,
412 variation_selector,
413 glyph))
414 {
415 case OT::GLYPH_VARIANT_NOT_FOUND: return false;
416 case OT::GLYPH_VARIANT_FOUND: return true;
417 case OT::GLYPH_VARIANT_USE_DEFAULT: break;
418 }
419
420 return get_nominal_glyph (unicode, glyph);
421 }
422 };
423
424 template <typename T>
425 struct hb_lazy_loader_t
426 {
427 inline void init (hb_face_t *face_)
428 {
429 face = face_;
430 instance = NULL;
431 }
432
433 inline void fini (void)
434 {
435 if (instance && instance != &OT::Null(T))
436 {
437 instance->fini();
438 free (instance);
439 }
440 }
441
442 inline const T* operator-> (void) const
443 {
444 retry:
445 T *p = (T *) hb_atomic_ptr_get (&instance);
446 if (unlikely (!p))
447 {
448 p = (T *) calloc (1, sizeof (T));
449 if (unlikely (!p))
450 return &OT::Null(T);
451 p->init (face);
452 if (unlikely (!hb_atomic_ptr_cmpexch (const_cast<T **>(&instance), NULL, p)))
453 {
454 p->fini ();
455 goto retry;
456 }
457 }
458 return p;
459 }
460
461 private:
462 hb_face_t *face;
463 T *instance;
464 };
465
466 struct hb_ot_font_t
467 {
468 hb_ot_face_cmap_accelerator_t cmap;
469 hb_ot_face_metrics_accelerator_t h_metrics;
470 hb_ot_face_metrics_accelerator_t v_metrics;
471 hb_lazy_loader_t<hb_ot_face_glyf_accelerator_t> glyf;
472 hb_lazy_loader_t<hb_ot_face_cbdt_accelerator_t> cbdt;
473 };
474
475
476 static hb_ot_font_t *
477 _hb_ot_font_create (hb_face_t *face)
478 {
479 hb_ot_font_t *ot_font = (hb_ot_font_t *) calloc (1, sizeof (hb_ot_font_t));
480
481 if (unlikely (!ot_font))
482 return NULL;
483
484 ot_font->cmap.init (face);
485 ot_font->h_metrics.init (face, HB_OT_TAG_hhea, HB_OT_TAG_hmtx, HB_OT_TAG_os2);
486 ot_font->v_metrics.init (face, HB_OT_TAG_vhea, HB_OT_TAG_vmtx, HB_TAG_NONE,
487 ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */
488 ot_font->glyf.init (face);
489 ot_font->cbdt.init (face);
490
491 return ot_font;
492 }
493
494 static void
495 _hb_ot_font_destroy (hb_ot_font_t *ot_font)
496 {
497 ot_font->cmap.fini ();
498 ot_font->h_metrics.fini ();
499 ot_font->v_metrics.fini ();
500 ot_font->glyf.fini ();
501 ot_font->cbdt.fini ();
502
503 free (ot_font);
504 }
505
506
507 static hb_bool_t
508 hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
509 void *font_data,
510 hb_codepoint_t unicode,
511 hb_codepoint_t *glyph,
512 void *user_data HB_UNUSED)
513
514 {
515 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
516 return ot_font->cmap.get_nominal_glyph (unicode, glyph);
517 }
518
519 static hb_bool_t
520 hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
521 void *font_data,
522 hb_codepoint_t unicode,
523 hb_codepoint_t variation_selector,
524 hb_codepoint_t *glyph,
525 void *user_data HB_UNUSED)
526 {
527 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
528 return ot_font->cmap.get_variation_glyph (unicode, variation_selector, glyph);
529 }
530
531 static hb_position_t
532 hb_ot_get_glyph_h_advance (hb_font_t *font HB_UNUSED,
533 void *font_data,
534 hb_codepoint_t glyph,
535 void *user_data HB_UNUSED)
536 {
537 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
538 return font->em_scale_x (ot_font->h_metrics.get_advance (glyph));
539 }
540
541 static hb_position_t
542 hb_ot_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
543 void *font_data,
544 hb_codepoint_t glyph,
545 void *user_data HB_UNUSED)
546 {
547 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
548 return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph));
549 }
550
551 static hb_bool_t
552 hb_ot_get_glyph_extents (hb_font_t *font HB_UNUSED,
553 void *font_data,
554 hb_codepoint_t glyph,
555 hb_glyph_extents_t *extents,
556 void *user_data HB_UNUSED)
557 {
558 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
559 bool ret = ot_font->glyf->get_extents (glyph, extents);
560 if (!ret)
561 ret = ot_font->cbdt->get_extents (glyph, extents);
562 extents->x_bearing = font->em_scale_x (extents->x_bearing);
563 extents->y_bearing = font->em_scale_y (extents->y_bearing);
564 extents->width = font->em_scale_x (extents->width);
565 extents->height = font->em_scale_y (extents->height);
566 return ret;
567 }
568
569 static hb_bool_t
570 hb_ot_get_font_h_extents (hb_font_t *font HB_UNUSED,
571 void *font_data,
572 hb_font_extents_t *metrics,
573 void *user_data HB_UNUSED)
574 {
575 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
576 metrics->ascender = font->em_scale_y (ot_font->h_metrics.ascender);
577 metrics->descender = font->em_scale_y (ot_font->h_metrics.descender);
578 metrics->line_gap = font->em_scale_y (ot_font->h_metrics.line_gap);
579 return ot_font->h_metrics.has_font_extents;
580 }
581
582 static hb_bool_t
583 hb_ot_get_font_v_extents (hb_font_t *font HB_UNUSED,
584 void *font_data,
585 hb_font_extents_t *metrics,
586 void *user_data HB_UNUSED)
587 {
588 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
589 metrics->ascender = font->em_scale_x (ot_font->v_metrics.ascender);
590 metrics->descender = font->em_scale_x (ot_font->v_metrics.descender);
591 metrics->line_gap = font->em_scale_x (ot_font->v_metrics.line_gap);
592 return ot_font->v_metrics.has_font_extents;
593 }
594
595 static hb_font_funcs_t *static_ot_funcs = NULL;
596
597 #ifdef HB_USE_ATEXIT
598 static
599 void free_static_ot_funcs (void)
600 {
601 hb_font_funcs_destroy (static_ot_funcs);
602 }
603 #endif
604
605 static hb_font_funcs_t *
606 _hb_ot_get_font_funcs (void)
607 {
608 retry:
609 hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ot_funcs);
610
611 if (unlikely (!funcs))
612 {
613 funcs = hb_font_funcs_create ();
614
615 hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, NULL, NULL);
616 hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, NULL, NULL);
617 hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, NULL, NULL);
618 hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, NULL, NULL);
619 hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, NULL, NULL);
620 hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, NULL, NULL);
621 //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, NULL, NULL);
622 //hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, NULL, NULL);
623 //hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, NULL, NULL); TODO
624 //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, NULL, NULL);
625 hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, NULL, NULL);
626 //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, NULL, NULL); TODO
627 //hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, NULL, NULL); TODO
628 //hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, NULL, NULL); TODO
629
630 hb_font_funcs_make_immutable (funcs);
631
632 if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, NULL, funcs)) {
633 hb_font_funcs_destroy (funcs);
634 goto retry;
635 }
636
637 #ifdef HB_USE_ATEXIT
638 atexit (free_static_ot_funcs); /* First person registers atexit() callback. */
639 #endif
640 };
641
642 return funcs;
643 }
644
645
646 /**
647 * hb_ot_font_set_funcs:
648 *
649 * Since: 0.9.28
650 **/
651 void
652 hb_ot_font_set_funcs (hb_font_t *font)
653 {
654 hb_ot_font_t *ot_font = _hb_ot_font_create (font->face);
655 if (unlikely (!ot_font))
656 return;
657
658 hb_font_set_funcs (font,
659 _hb_ot_get_font_funcs (),
660 ot_font,
661 (hb_destroy_func_t) _hb_ot_font_destroy);
662 }