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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2012 Google, Inc.
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 *
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
27 */
28
29 #include "hb.hh"
30
31 #include "hb-face.hh"
32 #include "hb-blob.hh"
33 #include "hb-open-file.hh"
34 #include "hb-ot-face.hh"
35 #include "hb-ot-cmap-table.hh"
36 #include "hb-map.hh"
37
38
39 /**
40 * SECTION:hb-face
41 * @title: hb-face
42 * @short_description: Font face objects
43 * @include: hb.h
44 *
45 * A font face is an object that represents a single face from within a
46 * font family.
47 *
48 * More precisely, a font face represents a single face in a binary font file.
49 * Font faces are typically built from a binary blob and a face index.
50 * Font faces are used to create fonts.
51 **/
52
53
54 /**
55 * hb_face_count:
56 * @blob: a blob.
57 *
58 * Fetches the number of faces in a blob.
59 *
60 * Return value: Number of faces in @blob
61 *
62 * Since: 1.7.7
63 **/
64 unsigned int
65 hb_face_count (hb_blob_t *blob)
66 {
67 if (unlikely (!blob))
68 return 0;
69
70 /* TODO We shouldn't be sanitizing blob. Port to run sanitizer and return if not sane. */
71 /* Make API signature const after. */
72 hb_blob_t *sanitized = hb_sanitize_context_t ().sanitize_blob<OT::OpenTypeFontFile> (hb_blob_reference (blob));
73 const OT::OpenTypeFontFile& ot = *sanitized->as<OT::OpenTypeFontFile> ();
74 unsigned int ret = ot.get_face_count ();
75 hb_blob_destroy (sanitized);
76
77 return ret;
78 }
79
80 /*
81 * hb_face_t
82 */
83
84 DEFINE_NULL_INSTANCE (hb_face_t) =
85 {
86 HB_OBJECT_HEADER_STATIC,
87
88 nullptr, /* reference_table_func */
89 nullptr, /* user_data */
90 nullptr, /* destroy */
91
92 0, /* index */
93 1000, /* upem */
94 0, /* num_glyphs */
95
96 /* Zero for the rest is fine. */
97 };
98
99
100 /**
101 * hb_face_create_for_tables:
102 * @reference_table_func: (closure user_data) (destroy destroy) (scope notified): Table-referencing function
103 * @user_data: A pointer to the user data
104 * @destroy: (nullable): A callback to call when @data is not needed anymore
105 *
106 * Variant of hb_face_create(), built for those cases where it is more
107 * convenient to provide data for individual tables instead of the whole font
108 * data. With the caveat that hb_face_get_table_tags() does not currently work
109 * with faces created this way.
110 *
111 * Creates a new face object from the specified @user_data and @reference_table_func,
112 * with the @destroy callback.
113 *
114 * Return value: (transfer full): The new face object
115 *
116 * Since: 0.9.2
117 **/
118 hb_face_t *
119 hb_face_create_for_tables (hb_reference_table_func_t reference_table_func,
120 void *user_data,
121 hb_destroy_func_t destroy)
122 {
123 hb_face_t *face;
124
125 if (!reference_table_func || !(face = hb_object_create<hb_face_t> ())) {
126 if (destroy)
127 destroy (user_data);
128 return hb_face_get_empty ();
129 }
130
131 face->reference_table_func = reference_table_func;
132 face->user_data = user_data;
133 face->destroy = destroy;
134
135 face->num_glyphs = -1;
136
137 face->data.init0 (face);
138 face->table.init0 (face);
139
140 return face;
141 }
142
143
144 typedef struct hb_face_for_data_closure_t {
145 hb_blob_t *blob;
146 uint16_t index;
147 } hb_face_for_data_closure_t;
148
149 static hb_face_for_data_closure_t *
150 _hb_face_for_data_closure_create (hb_blob_t *blob, unsigned int index)
151 {
152 hb_face_for_data_closure_t *closure;
153
154 closure = (hb_face_for_data_closure_t *) hb_calloc (1, sizeof (hb_face_for_data_closure_t));
155 if (unlikely (!closure))
156 return nullptr;
157
158 closure->blob = blob;
159 closure->index = (uint16_t) (index & 0xFFFFu);
160
161 return closure;
162 }
163
164 static void
165 _hb_face_for_data_closure_destroy (void *data)
166 {
167 hb_face_for_data_closure_t *closure = (hb_face_for_data_closure_t *) data;
168
169 hb_blob_destroy (closure->blob);
170 hb_free (closure);
171 }
172
173 static hb_blob_t *
174 _hb_face_for_data_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
175 {
176 hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) user_data;
177
178 if (tag == HB_TAG_NONE)
179 return hb_blob_reference (data->blob);
180
181 const OT::OpenTypeFontFile &ot_file = *data->blob->as<OT::OpenTypeFontFile> ();
182 unsigned int base_offset;
183 const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index, &base_offset);
184
185 const OT::OpenTypeTable &table = ot_face.get_table_by_tag (tag);
186
187 hb_blob_t *blob = hb_blob_create_sub_blob (data->blob, base_offset + table.offset, table.length);
188
189 return blob;
190 }
191
192 /**
193 * hb_face_create:
194 * @blob: #hb_blob_t to work upon
195 * @index: The index of the face within @blob
196 *
197 * Constructs a new face object from the specified blob and
198 * a face index into that blob.
199 *
200 * The face index is used for blobs of file formats such as TTC and
201 * and DFont that can contain more than one face. Face indices within
202 * such collections are zero-based.
203 *
204 * <note>Note: If the blob font format is not a collection, @index
205 * is ignored. Otherwise, only the lower 16-bits of @index are used.
206 * The unmodified @index can be accessed via hb_face_get_index().</note>
207 *
208 * <note>Note: The high 16-bits of @index, if non-zero, are used by
209 * hb_font_create() to load named-instances in variable fonts. See
210 * hb_font_create() for details.</note>
211 *
212 * Return value: (transfer full): The new face object
213 *
214 * Since: 0.9.2
215 **/
216 hb_face_t *
217 hb_face_create (hb_blob_t *blob,
218 unsigned int index)
219 {
220 hb_face_t *face;
221
222 if (unlikely (!blob))
223 blob = hb_blob_get_empty ();
224
225 blob = hb_sanitize_context_t ().sanitize_blob<OT::OpenTypeFontFile> (hb_blob_reference (blob));
226
227 hb_face_for_data_closure_t *closure = _hb_face_for_data_closure_create (blob, index);
228
229 if (unlikely (!closure))
230 {
231 hb_blob_destroy (blob);
232 return hb_face_get_empty ();
233 }
234
235 face = hb_face_create_for_tables (_hb_face_for_data_reference_table,
236 closure,
237 _hb_face_for_data_closure_destroy);
238
239 face->index = index;
240
241 return face;
242 }
243
244 /**
245 * hb_face_get_empty:
246 *
247 * Fetches the singleton empty face object.
248 *
249 * Return value: (transfer full): The empty face object
250 *
251 * Since: 0.9.2
252 **/
253 hb_face_t *
254 hb_face_get_empty ()
255 {
256 return const_cast<hb_face_t *> (&Null (hb_face_t));
257 }
258
259
260 /**
261 * hb_face_reference: (skip)
262 * @face: A face object
263 *
264 * Increases the reference count on a face object.
265 *
266 * Return value: The @face object
267 *
268 * Since: 0.9.2
269 **/
270 hb_face_t *
271 hb_face_reference (hb_face_t *face)
272 {
273 return hb_object_reference (face);
274 }
275
276 /**
277 * hb_face_destroy: (skip)
278 * @face: A face object
279 *
280 * Decreases the reference count on a face object. When the
281 * reference count reaches zero, the face is destroyed,
282 * freeing all memory.
283 *
284 * Since: 0.9.2
285 **/
286 void
287 hb_face_destroy (hb_face_t *face)
288 {
289 if (!hb_object_destroy (face)) return;
290
291 #ifndef HB_NO_SHAPER
292 for (hb_face_t::plan_node_t *node = face->shape_plans; node; )
293 {
294 hb_face_t::plan_node_t *next = node->next;
295 hb_shape_plan_destroy (node->shape_plan);
296 hb_free (node);
297 node = next;
298 }
299 #endif
300
301 face->data.fini ();
302 face->table.fini ();
303
304 if (face->destroy)
305 face->destroy (face->user_data);
306
307 hb_free (face);
308 }
309
310 /**
311 * hb_face_set_user_data: (skip)
312 * @face: A face object
313 * @key: The user-data key to set
314 * @data: A pointer to the user data
315 * @destroy: (nullable): A callback to call when @data is not needed anymore
316 * @replace: Whether to replace an existing data with the same key
317 *
318 * Attaches a user-data key/data pair to the given face object.
319 *
320 * Return value: `true` if success, `false` otherwise
321 *
322 * Since: 0.9.2
323 **/
324 hb_bool_t
325 hb_face_set_user_data (hb_face_t *face,
326 hb_user_data_key_t *key,
327 void * data,
328 hb_destroy_func_t destroy,
329 hb_bool_t replace)
330 {
331 return hb_object_set_user_data (face, key, data, destroy, replace);
332 }
333
334 /**
335 * hb_face_get_user_data: (skip)
336 * @face: A face object
337 * @key: The user-data key to query
338 *
339 * Fetches the user data associated with the specified key,
340 * attached to the specified face object.
341 *
342 * Return value: (transfer none): A pointer to the user data
343 *
344 * Since: 0.9.2
345 **/
346 void *
347 hb_face_get_user_data (const hb_face_t *face,
348 hb_user_data_key_t *key)
349 {
350 return hb_object_get_user_data (face, key);
351 }
352
353 /**
354 * hb_face_make_immutable:
355 * @face: A face object
356 *
357 * Makes the given face object immutable.
358 *
359 * Since: 0.9.2
360 **/
361 void
362 hb_face_make_immutable (hb_face_t *face)
363 {
364 if (hb_object_is_immutable (face))
365 return;
366
367 hb_object_make_immutable (face);
368 }
369
370 /**
371 * hb_face_is_immutable:
372 * @face: A face object
373 *
374 * Tests whether the given face object is immutable.
375 *
376 * Return value: `true` is @face is immutable, `false` otherwise
377 *
378 * Since: 0.9.2
379 **/
380 hb_bool_t
381 hb_face_is_immutable (const hb_face_t *face)
382 {
383 return hb_object_is_immutable (face);
384 }
385
386
387 /**
388 * hb_face_reference_table:
389 * @face: A face object
390 * @tag: The #hb_tag_t of the table to query
391 *
392 * Fetches a reference to the specified table within
393 * the specified face.
394 *
395 * Return value: (transfer full): A pointer to the @tag table within @face
396 *
397 * Since: 0.9.2
398 **/
399 hb_blob_t *
400 hb_face_reference_table (const hb_face_t *face,
401 hb_tag_t tag)
402 {
403 if (unlikely (tag == HB_TAG_NONE))
404 return hb_blob_get_empty ();
405
406 return face->reference_table (tag);
407 }
408
409 /**
410 * hb_face_reference_blob:
411 * @face: A face object
412 *
413 * Fetches a pointer to the binary blob that contains the
414 * specified face. Returns an empty blob if referencing face data is not
415 * possible.
416 *
417 * Return value: (transfer full): A pointer to the blob for @face
418 *
419 * Since: 0.9.2
420 **/
421 hb_blob_t *
422 hb_face_reference_blob (hb_face_t *face)
423 {
424 return face->reference_table (HB_TAG_NONE);
425 }
426
427 /**
428 * hb_face_set_index:
429 * @face: A face object
430 * @index: The index to assign
431 *
432 * Assigns the specified face-index to @face. Fails if the
433 * face is immutable.
434 *
435 * <note>Note: changing the index has no effect on the face itself
436 * This only changes the value returned by hb_face_get_index().</note>
437 *
438 * Since: 0.9.2
439 **/
440 void
441 hb_face_set_index (hb_face_t *face,
442 unsigned int index)
443 {
444 if (hb_object_is_immutable (face))
445 return;
446
447 face->index = index;
448 }
449
450 /**
451 * hb_face_get_index:
452 * @face: A face object
453 *
454 * Fetches the face-index corresponding to the given face.
455 *
456 * <note>Note: face indices within a collection are zero-based.</note>
457 *
458 * Return value: The index of @face.
459 *
460 * Since: 0.9.2
461 **/
462 unsigned int
463 hb_face_get_index (const hb_face_t *face)
464 {
465 return face->index;
466 }
467
468 /**
469 * hb_face_set_upem:
470 * @face: A face object
471 * @upem: The units-per-em value to assign
472 *
473 * Sets the units-per-em (upem) for a face object to the specified value.
474 *
475 * Since: 0.9.2
476 **/
477 void
478 hb_face_set_upem (hb_face_t *face,
479 unsigned int upem)
480 {
481 if (hb_object_is_immutable (face))
482 return;
483
484 face->upem = upem;
485 }
486
487 /**
488 * hb_face_get_upem:
489 * @face: A face object
490 *
491 * Fetches the units-per-em (upem) value of the specified face object.
492 *
493 * Return value: The upem value of @face
494 *
495 * Since: 0.9.2
496 **/
497 unsigned int
498 hb_face_get_upem (const hb_face_t *face)
499 {
500 return face->get_upem ();
501 }
502
503 /**
504 * hb_face_set_glyph_count:
505 * @face: A face object
506 * @glyph_count: The glyph-count value to assign
507 *
508 * Sets the glyph count for a face object to the specified value.
509 *
510 * Since: 0.9.7
511 **/
512 void
513 hb_face_set_glyph_count (hb_face_t *face,
514 unsigned int glyph_count)
515 {
516 if (hb_object_is_immutable (face))
517 return;
518
519 face->num_glyphs = glyph_count;
520 }
521
522 /**
523 * hb_face_get_glyph_count:
524 * @face: A face object
525 *
526 * Fetches the glyph-count value of the specified face object.
527 *
528 * Return value: The glyph-count value of @face
529 *
530 * Since: 0.9.7
531 **/
532 unsigned int
533 hb_face_get_glyph_count (const hb_face_t *face)
534 {
535 return face->get_num_glyphs ();
536 }
537
538 /**
539 * hb_face_get_table_tags:
540 * @face: A face object
541 * @start_offset: The index of first table tag to retrieve
542 * @table_count: (inout): Input = the maximum number of table tags to return;
543 * Output = the actual number of table tags returned (may be zero)
544 * @table_tags: (out) (array length=table_count): The array of table tags found
545 *
546 * Fetches a list of all table tags for a face, if possible. The list returned will
547 * begin at the offset provided
548 *
549 * Return value: Total number of tables, or zero if it is not possible to list
550 *
551 * Since: 1.6.0
552 **/
553 unsigned int
554 hb_face_get_table_tags (const hb_face_t *face,
555 unsigned int start_offset,
556 unsigned int *table_count, /* IN/OUT */
557 hb_tag_t *table_tags /* OUT */)
558 {
559 if (face->destroy != (hb_destroy_func_t) _hb_face_for_data_closure_destroy)
560 {
561 if (table_count)
562 *table_count = 0;
563 return 0;
564 }
565
566 hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) face->user_data;
567
568 const OT::OpenTypeFontFile &ot_file = *data->blob->as<OT::OpenTypeFontFile> ();
569 const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index);
570
571 return ot_face.get_table_tags (start_offset, table_count, table_tags);
572 }
573
574
575 /*
576 * Character set.
577 */
578
579
580 #ifndef HB_NO_FACE_COLLECT_UNICODES
581 /**
582 * hb_face_collect_unicodes:
583 * @face: A face object
584 * @out: The set to add Unicode characters to
585 *
586 * Collects all of the Unicode characters covered by @face and adds
587 * them to the #hb_set_t set @out.
588 *
589 * Since: 1.9.0
590 */
591 void
592 hb_face_collect_unicodes (hb_face_t *face,
593 hb_set_t *out)
594 {
595 face->table.cmap->collect_unicodes (out, face->get_num_glyphs ());
596 }
597 /**
598 * hb_face_collect_variation_selectors:
599 * @face: A face object
600 * @out: The set to add Variation Selector characters to
601 *
602 * Collects all Unicode "Variation Selector" characters covered by @face and adds
603 * them to the #hb_set_t set @out.
604 *
605 * Since: 1.9.0
606 */
607 void
608 hb_face_collect_variation_selectors (hb_face_t *face,
609 hb_set_t *out)
610 {
611 face->table.cmap->collect_variation_selectors (out);
612 }
613 /**
614 * hb_face_collect_variation_unicodes:
615 * @face: A face object
616 * @variation_selector: The Variation Selector to query
617 * @out: The set to add Unicode characters to
618 *
619 * Collects all Unicode characters for @variation_selector covered by @face and adds
620 * them to the #hb_set_t set @out.
621 *
622 * Since: 1.9.0
623 */
624 void
625 hb_face_collect_variation_unicodes (hb_face_t *face,
626 hb_codepoint_t variation_selector,
627 hb_set_t *out)
628 {
629 face->table.cmap->collect_variation_unicodes (variation_selector, out);
630 }
631 #endif
632
633
634 /*
635 * face-builder: A face that has add_table().
636 */
637
638 struct face_table_info_t
639 {
640 hb_blob_t* data;
641 signed order;
642 };
643
644 struct hb_face_builder_data_t
645 {
646 hb_hashmap_t<hb_tag_t, face_table_info_t> tables;
647 };
648
649 static int compare_entries (const void* pa, const void* pb)
650 {
651 const auto& a = * (const hb_pair_t<hb_tag_t, face_table_info_t> *) pa;
652 const auto& b = * (const hb_pair_t<hb_tag_t, face_table_info_t> *) pb;
653
654 /* Order by blob size first (smallest to largest) and then table tag */
655
656 if (a.second.order != b.second.order)
657 return a.second.order < b.second.order ? -1 : +1;
658
659 if (a.second.data->length != b.second.data->length)
660 return a.second.data->length < b.second.data->length ? -1 : +1;
661
662 return a.first < b.first ? -1 : a.first == b.first ? 0 : +1;
663 }
664
665 static hb_face_builder_data_t *
666 _hb_face_builder_data_create ()
667 {
668 hb_face_builder_data_t *data = (hb_face_builder_data_t *) hb_calloc (1, sizeof (hb_face_builder_data_t));
669 if (unlikely (!data))
670 return nullptr;
671
672 data->tables.init ();
673
674 return data;
675 }
676
677 static void
678 _hb_face_builder_data_destroy (void *user_data)
679 {
680 hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
681
682 for (auto info : data->tables.values())
683 hb_blob_destroy (info.data);
684
685 data->tables.fini ();
686
687 hb_free (data);
688 }
689
690 static hb_blob_t *
691 _hb_face_builder_data_reference_blob (hb_face_builder_data_t *data)
692 {
693
694 unsigned int table_count = data->tables.get_population ();
695 unsigned int face_length = table_count * 16 + 12;
696
697 for (auto info : data->tables.values())
698 face_length += hb_ceil_to_4 (hb_blob_get_length (info.data));
699
700 char *buf = (char *) hb_malloc (face_length);
701 if (unlikely (!buf))
702 return nullptr;
703
704 hb_serialize_context_t c (buf, face_length);
705 c.propagate_error (data->tables);
706 OT::OpenTypeFontFile *f = c.start_serialize<OT::OpenTypeFontFile> ();
707
708 bool is_cff = (data->tables.has (HB_TAG ('C','F','F',' '))
709 || data->tables.has (HB_TAG ('C','F','F','2')));
710 hb_tag_t sfnt_tag = is_cff ? OT::OpenTypeFontFile::CFFTag : OT::OpenTypeFontFile::TrueTypeTag;
711
712 // Sort the tags so that produced face is deterministic.
713 hb_vector_t<hb_pair_t <hb_tag_t, face_table_info_t>> sorted_entries;
714 data->tables.iter () | hb_sink (sorted_entries);
715 if (unlikely (sorted_entries.in_error ()))
716 {
717 hb_free (buf);
718 return nullptr;
719 }
720
721 sorted_entries.qsort (compare_entries);
722
723 bool ret = f->serialize_single (&c,
724 sfnt_tag,
725 + sorted_entries.iter()
726 | hb_map ([&] (hb_pair_t<hb_tag_t, face_table_info_t> _) {
727 return hb_pair_t<hb_tag_t, hb_blob_t*> (_.first, _.second.data);
728 }));
729
730 c.end_serialize ();
731
732 if (unlikely (!ret))
733 {
734 hb_free (buf);
735 return nullptr;
736 }
737
738 return hb_blob_create (buf, face_length, HB_MEMORY_MODE_WRITABLE, buf, hb_free);
739 }
740
741 static hb_blob_t *
742 _hb_face_builder_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
743 {
744 hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
745
746 if (!tag)
747 return _hb_face_builder_data_reference_blob (data);
748
749 return hb_blob_reference (data->tables[tag].data);
750 }
751
752
753 /**
754 * hb_face_builder_create:
755 *
756 * Creates a #hb_face_t that can be used with hb_face_builder_add_table().
757 * After tables are added to the face, it can be compiled to a binary
758 * font file by calling hb_face_reference_blob().
759 *
760 * Return value: (transfer full): New face.
761 *
762 * Since: 1.9.0
763 **/
764 hb_face_t *
765 hb_face_builder_create ()
766 {
767 hb_face_builder_data_t *data = _hb_face_builder_data_create ();
768 if (unlikely (!data)) return hb_face_get_empty ();
769
770 return hb_face_create_for_tables (_hb_face_builder_reference_table,
771 data,
772 _hb_face_builder_data_destroy);
773 }
774
775 /**
776 * hb_face_builder_add_table:
777 * @face: A face object created with hb_face_builder_create()
778 * @tag: The #hb_tag_t of the table to add
779 * @blob: The blob containing the table data to add
780 *
781 * Add table for @tag with data provided by @blob to the face. @face must
782 * be created using hb_face_builder_create().
783 *
784 * Since: 1.9.0
785 **/
786 hb_bool_t
787 hb_face_builder_add_table (hb_face_t *face, hb_tag_t tag, hb_blob_t *blob)
788 {
789 if (unlikely (face->destroy != (hb_destroy_func_t) _hb_face_builder_data_destroy))
790 return false;
791
792 if (tag == HB_MAP_VALUE_INVALID)
793 return false;
794
795 hb_face_builder_data_t *data = (hb_face_builder_data_t *) face->user_data;
796
797 hb_blob_t* previous = data->tables.get (tag).data;
798 if (!data->tables.set (tag, face_table_info_t {hb_blob_reference (blob), -1}))
799 {
800 hb_blob_destroy (blob);
801 return false;
802 }
803
804 hb_blob_destroy (previous);
805 return true;
806 }
807
808 /**
809 * hb_face_builder_sort_tables:
810 * @face: A face object created with hb_face_builder_create()
811 * @tags: (array zero-terminated=1): ordered list of table tags terminated by
812 * %HB_TAG_NONE
813 *
814 * Set the ordering of tables for serialization. Any tables not
815 * specified in the tags list will be ordered after the tables in
816 * tags, ordered by the default sort ordering.
817 *
818 * Since: 5.3.0
819 **/
820 void
821 hb_face_builder_sort_tables (hb_face_t *face,
822 const hb_tag_t *tags)
823 {
824 if (unlikely (face->destroy != (hb_destroy_func_t) _hb_face_builder_data_destroy))
825 return;
826
827 hb_face_builder_data_t *data = (hb_face_builder_data_t *) face->user_data;
828
829 // Sort all unspecified tables after any specified tables.
830 for (auto& info : data->tables.values_ref())
831 info.order = (unsigned) -1;
832
833 signed order = 0;
834 for (const hb_tag_t* tag = tags;
835 *tag;
836 tag++)
837 {
838 face_table_info_t* info;
839 if (!data->tables.has (*tag, &info)) continue;
840 info->order = order++;
841 }
842 }