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. */
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;
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)))
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
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 }
|
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-kern-table.hh"
40 #include "hb-ot-os2-table.hh"
41 #include "hb-ot-post-table.hh"
42 #include "hb-ot-var-hvar-table.hh"
43
44
45 struct hb_ot_face_metrics_accelerator_t
46 {
47 unsigned int num_metrics;
48 unsigned int num_advances;
49 unsigned int default_advance;
50 unsigned short ascender;
51 unsigned short descender;
52 unsigned short line_gap;
53 bool has_font_extents;
54
55 const OT::hmtxvmtx *table;
56 hb_blob_t *blob;
57
58 const OT::HVARVVAR *var;
59 hb_blob_t *var_blob;
60
61 inline void init (hb_face_t *face,
62 hb_tag_t _hea_tag,
63 hb_tag_t _mtx_tag,
64 hb_tag_t _var_tag,
65 hb_tag_t os2_tag,
66 unsigned int default_advance = 0)
67 {
68 this->default_advance = default_advance ? default_advance : face->get_upem ();
69
70 bool got_font_extents = false;
71 if (os2_tag)
72 {
73 hb_blob_t *os2_blob = OT::Sanitizer<OT::os2>::sanitize (face->reference_table (os2_tag));
74 const OT::os2 *os2 = OT::Sanitizer<OT::os2>::lock_instance (os2_blob);
75 #define USE_TYPO_METRICS (1u<<7)
76 if (0 != (os2->fsSelection & USE_TYPO_METRICS))
77 {
78 this->ascender = os2->sTypoAscender;
79 this->descender = os2->sTypoDescender;
80 this->line_gap = os2->sTypoLineGap;
81 got_font_extents = (this->ascender | this->descender) != 0;
82 }
83 hb_blob_destroy (os2_blob);
84 }
85
86 hb_blob_t *_hea_blob = OT::Sanitizer<OT::_hea>::sanitize (face->reference_table (_hea_tag));
87 const OT::_hea *_hea = OT::Sanitizer<OT::_hea>::lock_instance (_hea_blob);
88 this->num_advances = _hea->numberOfLongMetrics;
89 if (!got_font_extents)
90 {
91 this->ascender = _hea->ascender;
92 this->descender = _hea->descender;
93 this->line_gap = _hea->lineGap;
94 got_font_extents = (this->ascender | this->descender) != 0;
95 }
96 hb_blob_destroy (_hea_blob);
97
98 this->has_font_extents = got_font_extents;
99
100 this->blob = OT::Sanitizer<OT::hmtxvmtx>::sanitize (face->reference_table (_mtx_tag));
101
102 /* Cap num_metrics() and num_advances() based on table length. */
103 unsigned int len = hb_blob_get_length (this->blob);
104 if (unlikely (this->num_advances * 4 > len))
105 this->num_advances = len / 4;
106 this->num_metrics = this->num_advances + (len - 4 * this->num_advances) / 2;
107
108 /* We MUST set num_metrics to zero if num_advances is zero.
109 * Our get_advance() depends on that. */
110 if (unlikely (!this->num_advances))
111 {
112 this->num_metrics = this->num_advances = 0;
113 hb_blob_destroy (this->blob);
114 this->blob = hb_blob_get_empty ();
115 }
116 this->table = OT::Sanitizer<OT::hmtxvmtx>::lock_instance (this->blob);
117
118 this->var_blob = OT::Sanitizer<OT::HVARVVAR>::sanitize (face->reference_table (_var_tag));
119 this->var = OT::Sanitizer<OT::HVARVVAR>::lock_instance (this->var_blob);
120 }
121
122 inline void fini (void)
123 {
124 hb_blob_destroy (this->blob);
125 hb_blob_destroy (this->var_blob);
126 }
127
128 inline unsigned int get_advance (hb_codepoint_t glyph,
129 hb_font_t *font) const
130 {
131 if (unlikely (glyph >= this->num_metrics))
132 {
133 /* If this->num_metrics is zero, it means we don't have the metrics table
134 * for this direction: return default advance. Otherwise, it means that the
135 * glyph index is out of bound: return zero. */
136 if (this->num_metrics)
137 return 0;
138 else
139 return this->default_advance;
140 }
141
142 return this->table->longMetric[MIN (glyph, (uint32_t) this->num_advances - 1)].advance
143 + this->var->get_advance_var (glyph, font->coords, font->num_coords); // TODO Optimize?!
144 }
145 };
146
147 struct hb_ot_face_glyf_accelerator_t
148 {
149 bool short_offset;
150 unsigned int num_glyphs;
151 const OT::loca *loca;
152 const OT::glyf *glyf;
153 hb_blob_t *loca_blob;
154 hb_blob_t *glyf_blob;
155 unsigned int glyf_len;
156
157 inline void init (hb_face_t *face)
158 {
159 hb_blob_t *head_blob = OT::Sanitizer<OT::head>::sanitize (face->reference_table (HB_OT_TAG_head));
160 const OT::head *head = OT::Sanitizer<OT::head>::lock_instance (head_blob);
161 if ((unsigned int) head->indexToLocFormat > 1 || head->glyphDataFormat != 0)
162 {
163 /* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */
208
209 const OT::glyfGlyphHeader &glyph_header = OT::StructAtOffset<OT::glyfGlyphHeader> (this->glyf, start_offset);
210
211 extents->x_bearing = MIN (glyph_header.xMin, glyph_header.xMax);
212 extents->y_bearing = MAX (glyph_header.yMin, glyph_header.yMax);
213 extents->width = MAX (glyph_header.xMin, glyph_header.xMax) - extents->x_bearing;
214 extents->height = MIN (glyph_header.yMin, glyph_header.yMax) - extents->y_bearing;
215
216 return true;
217 }
218 };
219
220 struct hb_ot_face_cbdt_accelerator_t
221 {
222 hb_blob_t *cblc_blob;
223 hb_blob_t *cbdt_blob;
224 const OT::CBLC *cblc;
225 const OT::CBDT *cbdt;
226
227 unsigned int cbdt_len;
228 unsigned int upem;
229
230 inline void init (hb_face_t *face)
231 {
232 upem = face->get_upem();
233
234 cblc_blob = OT::Sanitizer<OT::CBLC>::sanitize (face->reference_table (HB_OT_TAG_CBLC));
235 cbdt_blob = OT::Sanitizer<OT::CBDT>::sanitize (face->reference_table (HB_OT_TAG_CBDT));
236 cbdt_len = hb_blob_get_length (cbdt_blob);
237
238 if (hb_blob_get_length (cblc_blob) == 0) {
239 cblc = nullptr;
240 cbdt = nullptr;
241 return; /* Not a bitmap font. */
242 }
243 cblc = OT::Sanitizer<OT::CBLC>::lock_instance (cblc_blob);
244 cbdt = OT::Sanitizer<OT::CBDT>::lock_instance (cbdt_blob);
245
246 }
247
248 inline void fini (void)
249 {
250 hb_blob_destroy (this->cblc_blob);
251 hb_blob_destroy (this->cbdt_blob);
252 }
253
254 inline bool get_extents (hb_codepoint_t glyph, hb_glyph_extents_t *extents) const
255 {
256 unsigned int x_ppem = upem, y_ppem = upem; /* TODO Use font ppem if available. */
257
258 if (!cblc)
259 return false; // Not a color bitmap font.
260
261 const OT::IndexSubtableRecord *subtable_record = this->cblc->find_table(glyph, &x_ppem, &y_ppem);
262 if (!subtable_record || !x_ppem || !y_ppem)
263 return false;
264
265 if (subtable_record->get_extents (extents))
266 return true;
267
268 unsigned int image_offset = 0, image_length = 0, image_format = 0;
269 if (!subtable_record->get_image_data (glyph, &image_offset, &image_length, &image_format))
270 return false;
271
272 {
273 /* TODO Move the following into CBDT struct when adding more formats. */
274
275 if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length))
276 return false;
277
278 switch (image_format)
279 {
280 case 17: {
281 if (unlikely (image_length < OT::GlyphBitmapDataFormat17::min_size))
282 return false;
285 OT::StructAtOffset<OT::GlyphBitmapDataFormat17> (this->cbdt, image_offset);
286 glyphFormat17.glyphMetrics.get_extents (extents);
287 }
288 break;
289 default:
290 // TODO: Support other image formats.
291 return false;
292 }
293 }
294
295 /* Convert to the font units. */
296 extents->x_bearing *= upem / (float) x_ppem;
297 extents->y_bearing *= upem / (float) y_ppem;
298 extents->width *= upem / (float) x_ppem;
299 extents->height *= upem / (float) y_ppem;
300
301 return true;
302 }
303 };
304
305 struct hb_ot_face_post_accelerator_t
306 {
307 hb_blob_t *post_blob;
308 OT::post::accelerator_t accel;
309
310 inline void init (hb_face_t *face)
311 {
312 hb_blob_t *blob = this->post_blob = OT::Sanitizer<OT::post>::sanitize (face->reference_table (HB_OT_TAG_post));
313 accel.init (OT::Sanitizer<OT::post>::lock_instance (blob), hb_blob_get_length (blob));
314 }
315
316 inline void fini (void)
317 {
318 accel.fini ();
319 hb_blob_destroy (this->post_blob);
320 }
321
322 inline bool get_glyph_name (hb_codepoint_t glyph,
323 char *name, unsigned int size) const
324 {
325 return this->accel.get_glyph_name (glyph, name, size);
326 }
327
328 inline bool get_glyph_from_name (const char *name, int len,
329 hb_codepoint_t *glyph) const
330 {
331 if (unlikely (!len))
332 return false;
333
334 return this->accel.get_glyph_from_name (name, len, glyph);
335 }
336 };
337
338 struct hb_ot_face_kern_accelerator_t
339 {
340 hb_blob_t *kern_blob;
341 OT::kern::accelerator_t accel;
342
343 inline void init (hb_face_t *face)
344 {
345 hb_blob_t *blob = this->kern_blob = OT::Sanitizer<OT::kern>::sanitize (face->reference_table (HB_OT_TAG_kern));
346 accel.init (OT::Sanitizer<OT::kern>::lock_instance (blob), hb_blob_get_length (blob));
347 }
348
349 inline void fini (void)
350 {
351 accel.fini ();
352 hb_blob_destroy (this->kern_blob);
353 }
354
355 inline int get_h_kerning (hb_codepoint_t left, hb_codepoint_t right) const
356 { return accel.get_h_kerning (left, right); }
357 };
358
359 typedef bool (*hb_cmap_get_glyph_func_t) (const void *obj,
360 hb_codepoint_t codepoint,
361 hb_codepoint_t *glyph);
362
363 template <typename Type>
364 static inline bool get_glyph_from (const void *obj,
365 hb_codepoint_t codepoint,
366 hb_codepoint_t *glyph)
367 {
368 const Type *typed_obj = (const Type *) obj;
369 return typed_obj->get_glyph (codepoint, glyph);
370 }
371
372 template <typename Type>
373 static inline bool get_glyph_from_symbol (const void *obj,
374 hb_codepoint_t codepoint,
375 hb_codepoint_t *glyph)
376 {
377 const Type *typed_obj = (const Type *) obj;
378 if (likely (typed_obj->get_glyph (codepoint, glyph)))
387 * under "Non-Standard (Symbol) Fonts". */
388 return typed_obj->get_glyph (0xF000u + codepoint, glyph);
389 }
390
391 return false;
392 }
393
394 struct hb_ot_face_cmap_accelerator_t
395 {
396 hb_cmap_get_glyph_func_t get_glyph_func;
397 const void *get_glyph_data;
398 OT::CmapSubtableFormat4::accelerator_t format4_accel;
399
400 const OT::CmapSubtableFormat14 *uvs_table;
401 hb_blob_t *blob;
402
403 inline void init (hb_face_t *face)
404 {
405 this->blob = OT::Sanitizer<OT::cmap>::sanitize (face->reference_table (HB_OT_TAG_cmap));
406 const OT::cmap *cmap = OT::Sanitizer<OT::cmap>::lock_instance (this->blob);
407 const OT::CmapSubtable *subtable = nullptr;
408 const OT::CmapSubtableFormat14 *subtable_uvs = nullptr;
409
410 bool symbol = false;
411 /* 32-bit subtables. */
412 if (!subtable) subtable = cmap->find_subtable (3, 10);
413 if (!subtable) subtable = cmap->find_subtable (0, 6);
414 if (!subtable) subtable = cmap->find_subtable (0, 4);
415 /* 16-bit subtables. */
416 if (!subtable) subtable = cmap->find_subtable (3, 1);
417 if (!subtable) subtable = cmap->find_subtable (0, 3);
418 if (!subtable) subtable = cmap->find_subtable (0, 2);
419 if (!subtable) subtable = cmap->find_subtable (0, 1);
420 if (!subtable) subtable = cmap->find_subtable (0, 0);
421 if (!subtable)
422 {
423 subtable = cmap->find_subtable (3, 0);
424 if (subtable) symbol = true;
425 }
426 /* Meh. */
427 if (!subtable) subtable = &OT::Null(OT::CmapSubtable);
428
467 return this->get_glyph_func (this->get_glyph_data, unicode, glyph);
468 }
469
470 inline bool get_variation_glyph (hb_codepoint_t unicode,
471 hb_codepoint_t variation_selector,
472 hb_codepoint_t *glyph) const
473 {
474 switch (this->uvs_table->get_glyph_variant (unicode,
475 variation_selector,
476 glyph))
477 {
478 case OT::GLYPH_VARIANT_NOT_FOUND: return false;
479 case OT::GLYPH_VARIANT_FOUND: return true;
480 case OT::GLYPH_VARIANT_USE_DEFAULT: break;
481 }
482
483 return get_nominal_glyph (unicode, glyph);
484 }
485 };
486
487 struct hb_ot_font_t
488 {
489 hb_ot_face_cmap_accelerator_t cmap;
490 hb_ot_face_metrics_accelerator_t h_metrics;
491 hb_ot_face_metrics_accelerator_t v_metrics;
492 OT::hb_lazy_loader_t<hb_ot_face_glyf_accelerator_t> glyf;
493 OT::hb_lazy_loader_t<hb_ot_face_cbdt_accelerator_t> cbdt;
494 OT::hb_lazy_loader_t<hb_ot_face_post_accelerator_t> post;
495 OT::hb_lazy_loader_t<hb_ot_face_kern_accelerator_t> kern;
496 };
497
498
499 static hb_ot_font_t *
500 _hb_ot_font_create (hb_face_t *face)
501 {
502 hb_ot_font_t *ot_font = (hb_ot_font_t *) calloc (1, sizeof (hb_ot_font_t));
503
504 if (unlikely (!ot_font))
505 return nullptr;
506
507 ot_font->cmap.init (face);
508 ot_font->h_metrics.init (face, HB_OT_TAG_hhea, HB_OT_TAG_hmtx, HB_OT_TAG_HVAR, HB_OT_TAG_os2);
509 ot_font->v_metrics.init (face, HB_OT_TAG_vhea, HB_OT_TAG_vmtx, HB_OT_TAG_VVAR, HB_TAG_NONE,
510 ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */
511 ot_font->glyf.init (face);
512 ot_font->cbdt.init (face);
513 ot_font->post.init (face);
514 ot_font->kern.init (face);
515
516 return ot_font;
517 }
518
519 static void
520 _hb_ot_font_destroy (void *data)
521 {
522 hb_ot_font_t *ot_font = (hb_ot_font_t *) data;
523
524 ot_font->cmap.fini ();
525 ot_font->h_metrics.fini ();
526 ot_font->v_metrics.fini ();
527 ot_font->glyf.fini ();
528 ot_font->cbdt.fini ();
529 ot_font->post.fini ();
530 ot_font->kern.fini ();
531
532 free (ot_font);
533 }
534
535
536 static hb_bool_t
537 hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
538 void *font_data,
539 hb_codepoint_t unicode,
540 hb_codepoint_t *glyph,
541 void *user_data HB_UNUSED)
542
543 {
544 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
545 return ot_font->cmap.get_nominal_glyph (unicode, glyph);
546 }
547
548 static hb_bool_t
549 hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
550 void *font_data,
551 hb_codepoint_t unicode,
552 hb_codepoint_t variation_selector,
553 hb_codepoint_t *glyph,
554 void *user_data HB_UNUSED)
555 {
556 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
557 return ot_font->cmap.get_variation_glyph (unicode, variation_selector, glyph);
558 }
559
560 static hb_position_t
561 hb_ot_get_glyph_h_advance (hb_font_t *font,
562 void *font_data,
563 hb_codepoint_t glyph,
564 void *user_data HB_UNUSED)
565 {
566 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
567 return font->em_scale_x (ot_font->h_metrics.get_advance (glyph, font));
568 }
569
570 static hb_position_t
571 hb_ot_get_glyph_v_advance (hb_font_t *font,
572 void *font_data,
573 hb_codepoint_t glyph,
574 void *user_data HB_UNUSED)
575 {
576 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
577 return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph, font));
578 }
579
580 static hb_position_t
581 hb_ot_get_glyph_h_kerning (hb_font_t *font,
582 void *font_data,
583 hb_codepoint_t left_glyph,
584 hb_codepoint_t right_glyph,
585 void *user_data HB_UNUSED)
586 {
587 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
588 return font->em_scale_x (ot_font->kern->get_h_kerning (left_glyph, right_glyph));
589 }
590
591 static hb_bool_t
592 hb_ot_get_glyph_extents (hb_font_t *font HB_UNUSED,
593 void *font_data,
594 hb_codepoint_t glyph,
595 hb_glyph_extents_t *extents,
596 void *user_data HB_UNUSED)
597 {
598 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
599 bool ret = ot_font->glyf->get_extents (glyph, extents);
600 if (!ret)
601 ret = ot_font->cbdt->get_extents (glyph, extents);
602 // TODO Hook up side-bearings variations.
603 extents->x_bearing = font->em_scale_x (extents->x_bearing);
604 extents->y_bearing = font->em_scale_y (extents->y_bearing);
605 extents->width = font->em_scale_x (extents->width);
606 extents->height = font->em_scale_y (extents->height);
607 return ret;
608 }
609
610 static hb_bool_t
611 hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
612 void *font_data,
613 hb_codepoint_t glyph,
614 char *name, unsigned int size,
615 void *user_data HB_UNUSED)
616 {
617 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
618 return ot_font->post->get_glyph_name (glyph, name, size);
619 }
620
621 static hb_bool_t
622 hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
623 void *font_data,
624 const char *name, int len,
625 hb_codepoint_t *glyph,
626 void *user_data HB_UNUSED)
627 {
628 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
629 return ot_font->post->get_glyph_from_name (name, len, glyph);
630 }
631
632 static hb_bool_t
633 hb_ot_get_font_h_extents (hb_font_t *font HB_UNUSED,
634 void *font_data,
635 hb_font_extents_t *metrics,
636 void *user_data HB_UNUSED)
637 {
638 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
639 metrics->ascender = font->em_scale_y (ot_font->h_metrics.ascender);
640 metrics->descender = font->em_scale_y (ot_font->h_metrics.descender);
641 metrics->line_gap = font->em_scale_y (ot_font->h_metrics.line_gap);
642 // TODO Hook up variations.
643 return ot_font->h_metrics.has_font_extents;
644 }
645
646 static hb_bool_t
647 hb_ot_get_font_v_extents (hb_font_t *font HB_UNUSED,
648 void *font_data,
649 hb_font_extents_t *metrics,
650 void *user_data HB_UNUSED)
651 {
652 const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
653 metrics->ascender = font->em_scale_x (ot_font->v_metrics.ascender);
654 metrics->descender = font->em_scale_x (ot_font->v_metrics.descender);
655 metrics->line_gap = font->em_scale_x (ot_font->v_metrics.line_gap);
656 // TODO Hook up variations.
657 return ot_font->v_metrics.has_font_extents;
658 }
659
660 static hb_font_funcs_t *static_ot_funcs = nullptr;
661
662 #ifdef HB_USE_ATEXIT
663 static
664 void free_static_ot_funcs (void)
665 {
666 hb_font_funcs_destroy (static_ot_funcs);
667 }
668 #endif
669
670 static hb_font_funcs_t *
671 _hb_ot_get_font_funcs (void)
672 {
673 retry:
674 hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ot_funcs);
675
676 if (unlikely (!funcs))
677 {
678 funcs = hb_font_funcs_create ();
679
680 hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
681 hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
682 hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr);
683 hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr);
684 hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, nullptr, nullptr);
685 hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, nullptr, nullptr);
686 //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
687 //hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
688 hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, nullptr, nullptr);
689 //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, nullptr, nullptr);
690 hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
691 //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr); TODO
692 hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
693 hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);
694
695 hb_font_funcs_make_immutable (funcs);
696
697 if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, nullptr, funcs)) {
698 hb_font_funcs_destroy (funcs);
699 goto retry;
700 }
701
702 #ifdef HB_USE_ATEXIT
703 atexit (free_static_ot_funcs); /* First person registers atexit() callback. */
704 #endif
705 };
706
707 return funcs;
708 }
709
710
711 /**
712 * hb_ot_font_set_funcs:
713 *
714 * Since: 0.9.28
715 **/
716 void
717 hb_ot_font_set_funcs (hb_font_t *font)
718 {
719 hb_ot_font_t *ot_font = _hb_ot_font_create (font->face);
720 if (unlikely (!ot_font))
721 return;
722
723 hb_font_set_funcs (font,
724 _hb_ot_get_font_funcs (),
725 ot_font,
726 _hb_ot_font_destroy);
727 }
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