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
hb_face_count(hb_blob_t * blob)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 *
hb_face_create_for_tables(hb_reference_table_func_t reference_table_func,void * user_data,hb_destroy_func_t destroy)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.set_relaxed (-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 *
_hb_face_for_data_closure_create(hb_blob_t * blob,unsigned int index)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
_hb_face_for_data_closure_destroy(void * data)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 *
_hb_face_for_data_reference_table(hb_face_t * face HB_UNUSED,hb_tag_t tag,void * user_data)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: (Xconstructor)
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 *
hb_face_create(hb_blob_t * blob,unsigned int index)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 *
hb_face_get_empty()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 *
hb_face_reference(hb_face_t * face)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
hb_face_destroy(hb_face_t * face)287 hb_face_destroy (hb_face_t *face)
288 {
289 if (!hb_object_destroy (face)) return;
290
291 for (hb_face_t::plan_node_t *node = face->shape_plans; node; )
292 {
293 hb_face_t::plan_node_t *next = node->next;
294 hb_shape_plan_destroy (node->shape_plan);
295 hb_free (node);
296 node = next;
297 }
298
299 face->data.fini ();
300 face->table.fini ();
301
302 if (face->destroy)
303 face->destroy (face->user_data);
304
305 hb_free (face);
306 }
307
308 /**
309 * hb_face_set_user_data: (skip)
310 * @face: A face object
311 * @key: The user-data key to set
312 * @data: A pointer to the user data
313 * @destroy: (nullable): A callback to call when @data is not needed anymore
314 * @replace: Whether to replace an existing data with the same key
315 *
316 * Attaches a user-data key/data pair to the given face object.
317 *
318 * Return value: %true if success, %false otherwise
319 *
320 * Since: 0.9.2
321 **/
322 hb_bool_t
hb_face_set_user_data(hb_face_t * face,hb_user_data_key_t * key,void * data,hb_destroy_func_t destroy,hb_bool_t replace)323 hb_face_set_user_data (hb_face_t *face,
324 hb_user_data_key_t *key,
325 void * data,
326 hb_destroy_func_t destroy,
327 hb_bool_t replace)
328 {
329 return hb_object_set_user_data (face, key, data, destroy, replace);
330 }
331
332 /**
333 * hb_face_get_user_data: (skip)
334 * @face: A face object
335 * @key: The user-data key to query
336 *
337 * Fetches the user data associated with the specified key,
338 * attached to the specified face object.
339 *
340 * Return value: (transfer none): A pointer to the user data
341 *
342 * Since: 0.9.2
343 **/
344 void *
hb_face_get_user_data(const hb_face_t * face,hb_user_data_key_t * key)345 hb_face_get_user_data (const hb_face_t *face,
346 hb_user_data_key_t *key)
347 {
348 return hb_object_get_user_data (face, key);
349 }
350
351 /**
352 * hb_face_make_immutable:
353 * @face: A face object
354 *
355 * Makes the given face object immutable.
356 *
357 * Since: 0.9.2
358 **/
359 void
hb_face_make_immutable(hb_face_t * face)360 hb_face_make_immutable (hb_face_t *face)
361 {
362 if (hb_object_is_immutable (face))
363 return;
364
365 hb_object_make_immutable (face);
366 }
367
368 /**
369 * hb_face_is_immutable:
370 * @face: A face object
371 *
372 * Tests whether the given face object is immutable.
373 *
374 * Return value: %true is @face is immutable, %false otherwise
375 *
376 * Since: 0.9.2
377 **/
378 hb_bool_t
hb_face_is_immutable(const hb_face_t * face)379 hb_face_is_immutable (const hb_face_t *face)
380 {
381 return hb_object_is_immutable (face);
382 }
383
384
385 /**
386 * hb_face_reference_table:
387 * @face: A face object
388 * @tag: The #hb_tag_t of the table to query
389 *
390 * Fetches a reference to the specified table within
391 * the specified face.
392 *
393 * Return value: (transfer full): A pointer to the @tag table within @face
394 *
395 * Since: 0.9.2
396 **/
397 hb_blob_t *
hb_face_reference_table(const hb_face_t * face,hb_tag_t tag)398 hb_face_reference_table (const hb_face_t *face,
399 hb_tag_t tag)
400 {
401 if (unlikely (tag == HB_TAG_NONE))
402 return hb_blob_get_empty ();
403
404 return face->reference_table (tag);
405 }
406
407 /**
408 * hb_face_reference_blob:
409 * @face: A face object
410 *
411 * Fetches a pointer to the binary blob that contains the
412 * specified face. Returns an empty blob if referencing face data is not
413 * possible.
414 *
415 * Return value: (transfer full): A pointer to the blob for @face
416 *
417 * Since: 0.9.2
418 **/
419 hb_blob_t *
hb_face_reference_blob(hb_face_t * face)420 hb_face_reference_blob (hb_face_t *face)
421 {
422 return face->reference_table (HB_TAG_NONE);
423 }
424
425 /**
426 * hb_face_set_index:
427 * @face: A face object
428 * @index: The index to assign
429 *
430 * Assigns the specified face-index to @face. Fails if the
431 * face is immutable.
432 *
433 * <note>Note: changing the index has no effect on the face itself
434 * This only changes the value returned by hb_face_get_index().</note>
435 *
436 * Since: 0.9.2
437 **/
438 void
hb_face_set_index(hb_face_t * face,unsigned int index)439 hb_face_set_index (hb_face_t *face,
440 unsigned int index)
441 {
442 if (hb_object_is_immutable (face))
443 return;
444
445 face->index = index;
446 }
447
448 /**
449 * hb_face_get_index:
450 * @face: A face object
451 *
452 * Fetches the face-index corresponding to the given face.
453 *
454 * <note>Note: face indices within a collection are zero-based.</note>
455 *
456 * Return value: The index of @face.
457 *
458 * Since: 0.9.2
459 **/
460 unsigned int
hb_face_get_index(const hb_face_t * face)461 hb_face_get_index (const hb_face_t *face)
462 {
463 return face->index;
464 }
465
466 /**
467 * hb_face_set_upem:
468 * @face: A face object
469 * @upem: The units-per-em value to assign
470 *
471 * Sets the units-per-em (upem) for a face object to the specified value.
472 *
473 * Since: 0.9.2
474 **/
475 void
hb_face_set_upem(hb_face_t * face,unsigned int upem)476 hb_face_set_upem (hb_face_t *face,
477 unsigned int upem)
478 {
479 if (hb_object_is_immutable (face))
480 return;
481
482 face->upem.set_relaxed (upem);
483 }
484
485 /**
486 * hb_face_get_upem:
487 * @face: A face object
488 *
489 * Fetches the units-per-em (upem) value of the specified face object.
490 *
491 * Return value: The upem value of @face
492 *
493 * Since: 0.9.2
494 **/
495 unsigned int
hb_face_get_upem(const hb_face_t * face)496 hb_face_get_upem (const hb_face_t *face)
497 {
498 return face->get_upem ();
499 }
500
501 /**
502 * hb_face_set_glyph_count:
503 * @face: A face object
504 * @glyph_count: The glyph-count value to assign
505 *
506 * Sets the glyph count for a face object to the specified value.
507 *
508 * Since: 0.9.7
509 **/
510 void
hb_face_set_glyph_count(hb_face_t * face,unsigned int glyph_count)511 hb_face_set_glyph_count (hb_face_t *face,
512 unsigned int glyph_count)
513 {
514 if (hb_object_is_immutable (face))
515 return;
516
517 face->num_glyphs.set_relaxed (glyph_count);
518 }
519
520 /**
521 * hb_face_get_glyph_count:
522 * @face: A face object
523 *
524 * Fetches the glyph-count value of the specified face object.
525 *
526 * Return value: The glyph-count value of @face
527 *
528 * Since: 0.9.7
529 **/
530 unsigned int
hb_face_get_glyph_count(const hb_face_t * face)531 hb_face_get_glyph_count (const hb_face_t *face)
532 {
533 return face->get_num_glyphs ();
534 }
535
536 /**
537 * hb_face_get_table_tags:
538 * @face: A face object
539 * @start_offset: The index of first table tag to retrieve
540 * @table_count: (inout): Input = the maximum number of table tags to return;
541 * Output = the actual number of table tags returned (may be zero)
542 * @table_tags: (out) (array length=table_count): The array of table tags found
543 *
544 * Fetches a list of all table tags for a face, if possible. The list returned will
545 * begin at the offset provided
546 *
547 * Return value: Total number of tables, or zero if it is not possible to list
548 *
549 * Since: 1.6.0
550 **/
551 unsigned int
hb_face_get_table_tags(const hb_face_t * face,unsigned int start_offset,unsigned int * table_count,hb_tag_t * table_tags)552 hb_face_get_table_tags (const hb_face_t *face,
553 unsigned int start_offset,
554 unsigned int *table_count, /* IN/OUT */
555 hb_tag_t *table_tags /* OUT */)
556 {
557 if (face->destroy != (hb_destroy_func_t) _hb_face_for_data_closure_destroy)
558 {
559 if (table_count)
560 *table_count = 0;
561 return 0;
562 }
563
564 hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) face->user_data;
565
566 const OT::OpenTypeFontFile &ot_file = *data->blob->as<OT::OpenTypeFontFile> ();
567 const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index);
568
569 return ot_face.get_table_tags (start_offset, table_count, table_tags);
570 }
571
572
573 /*
574 * Character set.
575 */
576
577
578 #ifndef HB_NO_FACE_COLLECT_UNICODES
579 /**
580 * hb_face_collect_unicodes:
581 * @face: A face object
582 * @out: The set to add Unicode characters to
583 *
584 * Collects all of the Unicode characters covered by @face and adds
585 * them to the #hb_set_t set @out.
586 *
587 * Since: 1.9.0
588 */
589 void
hb_face_collect_unicodes(hb_face_t * face,hb_set_t * out)590 hb_face_collect_unicodes (hb_face_t *face,
591 hb_set_t *out)
592 {
593 face->table.cmap->collect_unicodes (out, face->get_num_glyphs ());
594 }
595 /**
596 * hb_face_collect_variation_selectors:
597 * @face: A face object
598 * @out: The set to add Variation Selector characters to
599 *
600 * Collects all Unicode "Variation Selector" characters covered by @face and adds
601 * them to the #hb_set_t set @out.
602 *
603 * Since: 1.9.0
604 */
605 void
hb_face_collect_variation_selectors(hb_face_t * face,hb_set_t * out)606 hb_face_collect_variation_selectors (hb_face_t *face,
607 hb_set_t *out)
608 {
609 face->table.cmap->collect_variation_selectors (out);
610 }
611 /**
612 * hb_face_collect_variation_unicodes:
613 * @face: A face object
614 * @variation_selector: The Variation Selector to query
615 * @out: The set to add Unicode characters to
616 *
617 * Collects all Unicode characters for @variation_selector covered by @face and adds
618 * them to the #hb_set_t set @out.
619 *
620 * Since: 1.9.0
621 */
622 void
hb_face_collect_variation_unicodes(hb_face_t * face,hb_codepoint_t variation_selector,hb_set_t * out)623 hb_face_collect_variation_unicodes (hb_face_t *face,
624 hb_codepoint_t variation_selector,
625 hb_set_t *out)
626 {
627 face->table.cmap->collect_variation_unicodes (variation_selector, out);
628 }
629 #endif
630
631
632 /*
633 * face-builder: A face that has add_table().
634 */
635
636 struct hb_face_builder_data_t
637 {
638 hb_hashmap_t<hb_tag_t, hb_blob_t *> tables;
639 };
640
compare_entries(const void * pa,const void * pb)641 static int compare_entries (const void* pa, const void* pb)
642 {
643 const auto& a = * (const hb_pair_t<hb_tag_t, hb_blob_t*> *) pa;
644 const auto& b = * (const hb_pair_t<hb_tag_t, hb_blob_t*> *) pb;
645
646 /* Order by blob size first (smallest to largest) and then table tag */
647
648 if (a.second->length != b.second->length)
649 return a.second->length < b.second->length ? -1 : +1;
650
651 return a.first < b.first ? -1 : a.first == b.first ? 0 : +1;
652 }
653
654 static hb_face_builder_data_t *
_hb_face_builder_data_create()655 _hb_face_builder_data_create ()
656 {
657 hb_face_builder_data_t *data = (hb_face_builder_data_t *) hb_calloc (1, sizeof (hb_face_builder_data_t));
658 if (unlikely (!data))
659 return nullptr;
660
661 data->tables.init ();
662
663 return data;
664 }
665
666 static void
_hb_face_builder_data_destroy(void * user_data)667 _hb_face_builder_data_destroy (void *user_data)
668 {
669 hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
670
671 for (hb_blob_t* b : data->tables.values())
672 hb_blob_destroy (b);
673
674 data->tables.fini ();
675
676 hb_free (data);
677 }
678
679 static hb_blob_t *
_hb_face_builder_data_reference_blob(hb_face_builder_data_t * data)680 _hb_face_builder_data_reference_blob (hb_face_builder_data_t *data)
681 {
682
683 unsigned int table_count = data->tables.get_population ();
684 unsigned int face_length = table_count * 16 + 12;
685
686 for (hb_blob_t* b : data->tables.values())
687 face_length += hb_ceil_to_4 (hb_blob_get_length (b));
688
689 char *buf = (char *) hb_malloc (face_length);
690 if (unlikely (!buf))
691 return nullptr;
692
693 hb_serialize_context_t c (buf, face_length);
694 c.propagate_error (data->tables);
695 OT::OpenTypeFontFile *f = c.start_serialize<OT::OpenTypeFontFile> ();
696
697 bool is_cff = (data->tables.has (HB_TAG ('C','F','F',' '))
698 || data->tables.has (HB_TAG ('C','F','F','2')));
699 hb_tag_t sfnt_tag = is_cff ? OT::OpenTypeFontFile::CFFTag : OT::OpenTypeFontFile::TrueTypeTag;
700
701 // Sort the tags so that produced face is deterministic.
702 hb_vector_t<hb_pair_t <hb_tag_t, hb_blob_t*>> sorted_entries;
703 data->tables.iter () | hb_sink (sorted_entries);
704 if (unlikely (sorted_entries.in_error ()))
705 {
706 hb_free (buf);
707 return nullptr;
708 }
709
710 sorted_entries.qsort (compare_entries);
711 bool ret = f->serialize_single (&c, sfnt_tag, + sorted_entries.iter());
712
713 c.end_serialize ();
714
715 if (unlikely (!ret))
716 {
717 hb_free (buf);
718 return nullptr;
719 }
720
721 return hb_blob_create (buf, face_length, HB_MEMORY_MODE_WRITABLE, buf, hb_free);
722 }
723
724 static hb_blob_t *
_hb_face_builder_reference_table(hb_face_t * face HB_UNUSED,hb_tag_t tag,void * user_data)725 _hb_face_builder_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
726 {
727 hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
728
729 if (!tag)
730 return _hb_face_builder_data_reference_blob (data);
731
732 return hb_blob_reference (data->tables[tag]);
733 }
734
735
736 /**
737 * hb_face_builder_create:
738 *
739 * Creates a #hb_face_t that can be used with hb_face_builder_add_table().
740 * After tables are added to the face, it can be compiled to a binary
741 * font file by calling hb_face_reference_blob().
742 *
743 * Return value: (transfer full): New face.
744 *
745 * Since: 1.9.0
746 **/
747 hb_face_t *
hb_face_builder_create()748 hb_face_builder_create ()
749 {
750 hb_face_builder_data_t *data = _hb_face_builder_data_create ();
751 if (unlikely (!data)) return hb_face_get_empty ();
752
753 return hb_face_create_for_tables (_hb_face_builder_reference_table,
754 data,
755 _hb_face_builder_data_destroy);
756 }
757
758 /**
759 * hb_face_builder_add_table:
760 * @face: A face object created with hb_face_builder_create()
761 * @tag: The #hb_tag_t of the table to add
762 * @blob: The blob containing the table data to add
763 *
764 * Add table for @tag with data provided by @blob to the face. @face must
765 * be created using hb_face_builder_create().
766 *
767 * Since: 1.9.0
768 **/
769 hb_bool_t
hb_face_builder_add_table(hb_face_t * face,hb_tag_t tag,hb_blob_t * blob)770 hb_face_builder_add_table (hb_face_t *face, hb_tag_t tag, hb_blob_t *blob)
771 {
772 if (tag == HB_MAP_VALUE_INVALID)
773 return false;
774
775 if (unlikely (face->destroy != (hb_destroy_func_t) _hb_face_builder_data_destroy))
776 return false;
777
778 hb_face_builder_data_t *data = (hb_face_builder_data_t *) face->user_data;
779
780 hb_blob_t* previous = data->tables.get (tag);
781 if (!data->tables.set (tag, hb_blob_reference (blob)))
782 {
783 hb_blob_destroy (blob);
784 return false;
785 }
786
787 hb_blob_destroy (previous);
788 return true;
789 }
790