summaryrefslogtreecommitdiff
path: root/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-face.cc
blob: e340710586c15b7610af29da7a7fa272d86f9c27 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
/*
 * Copyright © 2009  Red Hat, Inc.
 * Copyright © 2012  Google, Inc.
 *
 *  This is part of HarfBuzz, a text shaping library.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and its documentation for any purpose, provided that the
 * above copyright notice and the following two paragraphs appear in
 * all copies of this software.
 *
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * Red Hat Author(s): Behdad Esfahbod
 * Google Author(s): Behdad Esfahbod
 */

#include "hb.hh"

#include "hb-face.hh"
#include "hb-blob.hh"
#include "hb-open-file.hh"
#include "hb-ot-face.hh"
#include "hb-ot-cmap-table.hh"


/**
 * SECTION:hb-face
 * @title: hb-face
 * @short_description: Font face objects
 * @include: hb.h
 *
 * A font face is an object that represents a single face from within a
 * font family.
 *
 * More precisely, a font face represents a single face in a binary font file.
 * Font faces are typically built from a binary blob and a face index.
 * Font faces are used to create fonts.
 *
 * A font face can be created from a binary blob using hb_face_create().
 * The face index is used to select a face from a binary blob that contains
 * multiple faces.  For example, a binary blob that contains both a regular
 * and a bold face can be used to create two font faces, one for each face
 * index.
 **/


/**
 * hb_face_count:
 * @blob: a blob.
 *
 * Fetches the number of faces in a blob.
 *
 * Return value: Number of faces in @blob
 *
 * Since: 1.7.7
 **/
unsigned int
hb_face_count (hb_blob_t *blob)
{
  if (unlikely (!blob))
    return 0;

  /* TODO We shouldn't be sanitizing blob.  Port to run sanitizer and return if not sane. */
  /* Make API signature const after. */
  hb_blob_t *sanitized = hb_sanitize_context_t ().sanitize_blob<OT::OpenTypeFontFile> (hb_blob_reference (blob));
  const OT::OpenTypeFontFile& ot = *sanitized->as<OT::OpenTypeFontFile> ();
  unsigned int ret = ot.get_face_count ();
  hb_blob_destroy (sanitized);

  return ret;
}

/*
 * hb_face_t
 */

DEFINE_NULL_INSTANCE (hb_face_t) =
{
  HB_OBJECT_HEADER_STATIC,

  nullptr, /* reference_table_func */
  nullptr, /* user_data */
  nullptr, /* destroy */

  0,    /* index */
  1000, /* upem */
  0,    /* num_glyphs */

  /* Zero for the rest is fine. */
};


/**
 * hb_face_create_for_tables:
 * @reference_table_func: (closure user_data) (destroy destroy) (scope notified): Table-referencing function
 * @user_data: A pointer to the user data
 * @destroy: (nullable): A callback to call when @data is not needed anymore
 *
 * Variant of hb_face_create(), built for those cases where it is more
 * convenient to provide data for individual tables instead of the whole font
 * data. With the caveat that hb_face_get_table_tags() does not currently work
 * with faces created this way.
 *
 * Creates a new face object from the specified @user_data and @reference_table_func,
 * with the @destroy callback.
 *
 * Return value: (transfer full): The new face object
 *
 * Since: 0.9.2
 **/
hb_face_t *
hb_face_create_for_tables (hb_reference_table_func_t  reference_table_func,
			   void                      *user_data,
			   hb_destroy_func_t          destroy)
{
  hb_face_t *face;

  if (!reference_table_func || !(face = hb_object_create<hb_face_t> ())) {
    if (destroy)
      destroy (user_data);
    return hb_face_get_empty ();
  }

  face->reference_table_func = reference_table_func;
  face->user_data = user_data;
  face->destroy = destroy;

  face->num_glyphs = -1;

  face->data.init0 (face);
  face->table.init0 (face);

  return face;
}


typedef struct hb_face_for_data_closure_t {
  hb_blob_t *blob;
  uint16_t  index;
} hb_face_for_data_closure_t;

static hb_face_for_data_closure_t *
_hb_face_for_data_closure_create (hb_blob_t *blob, unsigned int index)
{
  hb_face_for_data_closure_t *closure;

  closure = (hb_face_for_data_closure_t *) hb_calloc (1, sizeof (hb_face_for_data_closure_t));
  if (unlikely (!closure))
    return nullptr;

  closure->blob = blob;
  closure->index = (uint16_t) (index & 0xFFFFu);

  return closure;
}

static void
_hb_face_for_data_closure_destroy (void *data)
{
  hb_face_for_data_closure_t *closure = (hb_face_for_data_closure_t *) data;

  hb_blob_destroy (closure->blob);
  hb_free (closure);
}

static hb_blob_t *
_hb_face_for_data_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
{
  hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) user_data;

  if (tag == HB_TAG_NONE)
    return hb_blob_reference (data->blob);

  const OT::OpenTypeFontFile &ot_file = *data->blob->as<OT::OpenTypeFontFile> ();
  unsigned int base_offset;
  const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index, &base_offset);

  const OT::OpenTypeTable &table = ot_face.get_table_by_tag (tag);

  hb_blob_t *blob = hb_blob_create_sub_blob (data->blob, base_offset + table.offset, table.length);

  return blob;
}

/**
 * hb_face_create:
 * @blob: #hb_blob_t to work upon
 * @index: The index of the face within @blob
 *
 * Constructs a new face object from the specified blob and
 * a face index into that blob.
 *
 * The face index is used for blobs of file formats such as TTC and
 * DFont that can contain more than one face.  Face indices within
 * such collections are zero-based.
 *
 * <note>Note: If the blob font format is not a collection, @index
 * is ignored.  Otherwise, only the lower 16-bits of @index are used.
 * The unmodified @index can be accessed via hb_face_get_index().</note>
 *
 * <note>Note: The high 16-bits of @index, if non-zero, are used by
 * hb_font_create() to load named-instances in variable fonts.  See
 * hb_font_create() for details.</note>
 *
 * Return value: (transfer full): The new face object
 *
 * Since: 0.9.2
 **/
hb_face_t *
hb_face_create (hb_blob_t    *blob,
		unsigned int  index)
{
  hb_face_t *face;

  if (unlikely (!blob))
    blob = hb_blob_get_empty ();

  blob = hb_sanitize_context_t ().sanitize_blob<OT::OpenTypeFontFile> (hb_blob_reference (blob));

  hb_face_for_data_closure_t *closure = _hb_face_for_data_closure_create (blob, index);

  if (unlikely (!closure))
  {
    hb_blob_destroy (blob);
    return hb_face_get_empty ();
  }

  face = hb_face_create_for_tables (_hb_face_for_data_reference_table,
				    closure,
				    _hb_face_for_data_closure_destroy);

  face->index = index;

  return face;
}

/**
 * hb_face_get_empty:
 *
 * Fetches the singleton empty face object.
 *
 * Return value: (transfer full): The empty face object
 *
 * Since: 0.9.2
 **/
hb_face_t *
hb_face_get_empty ()
{
  return const_cast<hb_face_t *> (&Null (hb_face_t));
}


/**
 * hb_face_reference: (skip)
 * @face: A face object
 *
 * Increases the reference count on a face object.
 *
 * Return value: The @face object
 *
 * Since: 0.9.2
 **/
hb_face_t *
hb_face_reference (hb_face_t *face)
{
  return hb_object_reference (face);
}

/**
 * hb_face_destroy: (skip)
 * @face: A face object
 *
 * Decreases the reference count on a face object. When the
 * reference count reaches zero, the face is destroyed,
 * freeing all memory.
 *
 * Since: 0.9.2
 **/
void
hb_face_destroy (hb_face_t *face)
{
  if (!hb_object_destroy (face)) return;

#ifndef HB_NO_SHAPER
  for (hb_face_t::plan_node_t *node = face->shape_plans; node; )
  {
    hb_face_t::plan_node_t *next = node->next;
    hb_shape_plan_destroy (node->shape_plan);
    hb_free (node);
    node = next;
  }
#endif

  face->data.fini ();
  face->table.fini ();

  if (face->destroy)
    face->destroy (face->user_data);

  hb_free (face);
}

/**
 * hb_face_set_user_data: (skip)
 * @face: A face object
 * @key: The user-data key to set
 * @data: A pointer to the user data
 * @destroy: (nullable): A callback to call when @data is not needed anymore
 * @replace: Whether to replace an existing data with the same key
 *
 * Attaches a user-data key/data pair to the given face object.
 *
 * Return value: `true` if success, `false` otherwise
 *
 * Since: 0.9.2
 **/
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)
{
  return hb_object_set_user_data (face, key, data, destroy, replace);
}

/**
 * hb_face_get_user_data: (skip)
 * @face: A face object
 * @key: The user-data key to query
 *
 * Fetches the user data associated with the specified key,
 * attached to the specified face object.
 *
 * Return value: (transfer none): A pointer to the user data
 *
 * Since: 0.9.2
 **/
void *
hb_face_get_user_data (const hb_face_t    *face,
		       hb_user_data_key_t *key)
{
  return hb_object_get_user_data (face, key);
}

/**
 * hb_face_make_immutable:
 * @face: A face object
 *
 * Makes the given face object immutable.
 *
 * Since: 0.9.2
 **/
void
hb_face_make_immutable (hb_face_t *face)
{
  if (hb_object_is_immutable (face))
    return;

  hb_object_make_immutable (face);
}

/**
 * hb_face_is_immutable:
 * @face: A face object
 *
 * Tests whether the given face object is immutable.
 *
 * Return value: `true` is @face is immutable, `false` otherwise
 *
 * Since: 0.9.2
 **/
hb_bool_t
hb_face_is_immutable (const hb_face_t *face)
{
  return hb_object_is_immutable (face);
}


/**
 * hb_face_reference_table:
 * @face: A face object
 * @tag: The #hb_tag_t of the table to query
 *
 * Fetches a reference to the specified table within
 * the specified face.
 *
 * Return value: (transfer full): A pointer to the @tag table within @face
 *
 * Since: 0.9.2
 **/
hb_blob_t *
hb_face_reference_table (const hb_face_t *face,
			 hb_tag_t tag)
{
  if (unlikely (tag == HB_TAG_NONE))
    return hb_blob_get_empty ();

  return face->reference_table (tag);
}

/**
 * hb_face_reference_blob:
 * @face: A face object
 *
 * Fetches a pointer to the binary blob that contains the
 * specified face. Returns an empty blob if referencing face data is not
 * possible.
 *
 * Return value: (transfer full): A pointer to the blob for @face
 *
 * Since: 0.9.2
 **/
hb_blob_t *
hb_face_reference_blob (hb_face_t *face)
{
  return face->reference_table (HB_TAG_NONE);
}

/**
 * hb_face_set_index:
 * @face: A face object
 * @index: The index to assign
 *
 * Assigns the specified face-index to @face. Fails if the
 * face is immutable.
 *
 * <note>Note: changing the index has no effect on the face itself
 * This only changes the value returned by hb_face_get_index().</note>
 *
 * Since: 0.9.2
 **/
void
hb_face_set_index (hb_face_t    *face,
		   unsigned int  index)
{
  if (hb_object_is_immutable (face))
    return;

  face->index = index;
}

/**
 * hb_face_get_index:
 * @face: A face object
 *
 * Fetches the face-index corresponding to the given face.
 *
 * <note>Note: face indices within a collection are zero-based.</note>
 *
 * Return value: The index of @face.
 *
 * Since: 0.9.2
 **/
unsigned int
hb_face_get_index (const hb_face_t *face)
{
  return face->index;
}

/**
 * hb_face_set_upem:
 * @face: A face object
 * @upem: The units-per-em value to assign
 *
 * Sets the units-per-em (upem) for a face object to the specified value.
 *
 * This API is used in rare circumstances.
 *
 * Since: 0.9.2
 **/
void
hb_face_set_upem (hb_face_t    *face,
		  unsigned int  upem)
{
  if (hb_object_is_immutable (face))
    return;

  face->upem = upem;
}

/**
 * hb_face_get_upem:
 * @face: A face object
 *
 * Fetches the units-per-em (UPEM) value of the specified face object.
 *
 * Typical UPEM values for fonts are 1000, or 2048, but any value
 * in between 16 and 16,384 is allowed for OpenType fonts.
 *
 * Return value: The upem value of @face
 *
 * Since: 0.9.2
 **/
unsigned int
hb_face_get_upem (const hb_face_t *face)
{
  return face->get_upem ();
}

/**
 * hb_face_set_glyph_count:
 * @face: A face object
 * @glyph_count: The glyph-count value to assign
 *
 * Sets the glyph count for a face object to the specified value.
 *
 * This API is used in rare circumstances.
 *
 * Since: 0.9.7
 **/
void
hb_face_set_glyph_count (hb_face_t    *face,
			 unsigned int  glyph_count)
{
  if (hb_object_is_immutable (face))
    return;

  face->num_glyphs = glyph_count;
}

/**
 * hb_face_get_glyph_count:
 * @face: A face object
 *
 * Fetches the glyph-count value of the specified face object.
 *
 * Return value: The glyph-count value of @face
 *
 * Since: 0.9.7
 **/
unsigned int
hb_face_get_glyph_count (const hb_face_t *face)
{
  return face->get_num_glyphs ();
}

/**
 * hb_face_get_table_tags:
 * @face: A face object
 * @start_offset: The index of first table tag to retrieve
 * @table_count: (inout): Input = the maximum number of table tags to return;
 *                Output = the actual number of table tags returned (may be zero)
 * @table_tags: (out) (array length=table_count): The array of table tags found
 *
 * Fetches a list of all table tags for a face, if possible. The list returned will
 * begin at the offset provided
 *
 * Return value: Total number of tables, or zero if it is not possible to list
 *
 * Since: 1.6.0
 **/
unsigned int
hb_face_get_table_tags (const hb_face_t *face,
			unsigned int  start_offset,
			unsigned int *table_count, /* IN/OUT */
			hb_tag_t     *table_tags /* OUT */)
{
  if (face->destroy != (hb_destroy_func_t) _hb_face_for_data_closure_destroy)
  {
    if (table_count)
      *table_count = 0;
    return 0;
  }

  hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) face->user_data;

  const OT::OpenTypeFontFile &ot_file = *data->blob->as<OT::OpenTypeFontFile> ();
  const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index);

  return ot_face.get_table_tags (start_offset, table_count, table_tags);
}


/*
 * Character set.
 */


#ifndef HB_NO_FACE_COLLECT_UNICODES
/**
 * hb_face_collect_unicodes:
 * @face: A face object
 * @out: (out): The set to add Unicode characters to
 *
 * Collects all of the Unicode characters covered by @face and adds
 * them to the #hb_set_t set @out.
 *
 * Since: 1.9.0
 */
void
hb_face_collect_unicodes (hb_face_t *face,
			  hb_set_t  *out)
{
  face->table.cmap->collect_unicodes (out, face->get_num_glyphs ());
}
/**
 * hb_face_collect_nominal_glyph_mapping:
 * @face: A face object
 * @mapping: (out): The map to add Unicode-to-glyph mapping to
 * @unicodes: (nullable) (out): The set to add Unicode characters to, or `NULL`
 *
 * Collects the mapping from Unicode characters to nominal glyphs of the @face,
 * and optionally all of the Unicode characters covered by @face.
 *
 * Since: 7.0.0
 */
void
hb_face_collect_nominal_glyph_mapping (hb_face_t *face,
				       hb_map_t  *mapping,
				       hb_set_t  *unicodes)
{
  hb_set_t stack_unicodes;
  if (!unicodes)
    unicodes = &stack_unicodes;
  face->table.cmap->collect_mapping (unicodes, mapping, face->get_num_glyphs ());
}
/**
 * hb_face_collect_variation_selectors:
 * @face: A face object
 * @out: (out): The set to add Variation Selector characters to
 *
 * Collects all Unicode "Variation Selector" characters covered by @face and adds
 * them to the #hb_set_t set @out.
 *
 * Since: 1.9.0
 */
void
hb_face_collect_variation_selectors (hb_face_t *face,
				     hb_set_t  *out)
{
  face->table.cmap->collect_variation_selectors (out);
}
/**
 * hb_face_collect_variation_unicodes:
 * @face: A face object
 * @variation_selector: The Variation Selector to query
 * @out: (out): The set to add Unicode characters to
 *
 * Collects all Unicode characters for @variation_selector covered by @face and adds
 * them to the #hb_set_t set @out.
 *
 * Since: 1.9.0
 */
void
hb_face_collect_variation_unicodes (hb_face_t *face,
				    hb_codepoint_t variation_selector,
				    hb_set_t  *out)
{
  face->table.cmap->collect_variation_unicodes (variation_selector, out);
}
#endif