1 /*
2 * Copyright © 2012,2013 Mozilla Foundation.
3 * Copyright © 2012,2013 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 * Mozilla Author(s): Jonathan Kew
26 * Google Author(s): Behdad Esfahbod
27 */
28
29 #include "hb.hh"
30
31 #ifdef HAVE_CORETEXT
32
33 #include "hb-shaper-impl.hh"
34
35 #include "hb-coretext.h"
36 #include "hb-aat-layout.hh"
37
38
39 /**
40 * SECTION:hb-coretext
41 * @title: hb-coretext
42 * @short_description: CoreText integration
43 * @include: hb-coretext.h
44 *
45 * Functions for using HarfBuzz with the CoreText fonts.
46 **/
47
48 /* https://developer.apple.com/documentation/coretext/1508745-ctfontcreatewithgraphicsfont */
49 #define HB_CORETEXT_DEFAULT_FONT_SIZE 12.f
50
51 static void
release_table_data(void * user_data)52 release_table_data (void *user_data)
53 {
54 CFDataRef cf_data = reinterpret_cast<CFDataRef> (user_data);
55 CFRelease(cf_data);
56 }
57
58 static hb_blob_t *
_hb_cg_reference_table(hb_face_t * face HB_UNUSED,hb_tag_t tag,void * user_data)59 _hb_cg_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
60 {
61 CGFontRef cg_font = reinterpret_cast<CGFontRef> (user_data);
62 CFDataRef cf_data = CGFontCopyTableForTag (cg_font, tag);
63 if (unlikely (!cf_data))
64 return nullptr;
65
66 const char *data = reinterpret_cast<const char*> (CFDataGetBytePtr (cf_data));
67 const size_t length = CFDataGetLength (cf_data);
68 if (!data || !length)
69 {
70 CFRelease (cf_data);
71 return nullptr;
72 }
73
74 return hb_blob_create (data, length, HB_MEMORY_MODE_READONLY,
75 reinterpret_cast<void *> (const_cast<__CFData *> (cf_data)),
76 release_table_data);
77 }
78
79 static void
_hb_cg_font_release(void * data)80 _hb_cg_font_release (void *data)
81 {
82 CGFontRelease ((CGFontRef) data);
83 }
84
85
86 static CTFontDescriptorRef
get_last_resort_font_desc()87 get_last_resort_font_desc ()
88 {
89 // TODO Handle allocation failures?
90 CTFontDescriptorRef last_resort = CTFontDescriptorCreateWithNameAndSize (CFSTR("LastResort"), 0);
91 CFArrayRef cascade_list = CFArrayCreate (kCFAllocatorDefault,
92 (const void **) &last_resort,
93 1,
94 &kCFTypeArrayCallBacks);
95 CFRelease (last_resort);
96 CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,
97 (const void **) &kCTFontCascadeListAttribute,
98 (const void **) &cascade_list,
99 1,
100 &kCFTypeDictionaryKeyCallBacks,
101 &kCFTypeDictionaryValueCallBacks);
102 CFRelease (cascade_list);
103
104 CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);
105 CFRelease (attributes);
106 return font_desc;
107 }
108
109 static void
release_data(void * info,const void * data,size_t size)110 release_data (void *info, const void *data, size_t size)
111 {
112 assert (hb_blob_get_length ((hb_blob_t *) info) == size &&
113 hb_blob_get_data ((hb_blob_t *) info, nullptr) == data);
114
115 hb_blob_destroy ((hb_blob_t *) info);
116 }
117
118 static CGFontRef
create_cg_font(hb_face_t * face)119 create_cg_font (hb_face_t *face)
120 {
121 CGFontRef cg_font = nullptr;
122 if (face->destroy == _hb_cg_font_release)
123 {
124 cg_font = CGFontRetain ((CGFontRef) face->user_data);
125 }
126 else
127 {
128 hb_blob_t *blob = hb_face_reference_blob (face);
129 unsigned int blob_length;
130 const char *blob_data = hb_blob_get_data (blob, &blob_length);
131 if (unlikely (!blob_length))
132 DEBUG_MSG (CORETEXT, face, "Face has empty blob");
133
134 CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data);
135 if (likely (provider))
136 {
137 cg_font = CGFontCreateWithDataProvider (provider);
138 if (unlikely (!cg_font))
139 DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
140 CGDataProviderRelease (provider);
141 }
142 }
143 return cg_font;
144 }
145
146 static CTFontRef
create_ct_font(CGFontRef cg_font,CGFloat font_size)147 create_ct_font (CGFontRef cg_font, CGFloat font_size)
148 {
149 CTFontRef ct_font = nullptr;
150
151 /* CoreText does not enable trak table usage / tracking when creating a CTFont
152 * using CTFontCreateWithGraphicsFont. The only way of enabling tracking seems
153 * to be through the CTFontCreateUIFontForLanguage call. */
154 CFStringRef cg_postscript_name = CGFontCopyPostScriptName (cg_font);
155 if (CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSText")) ||
156 CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSDisplay")))
157 {
158 #if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1080
159 # define kCTFontUIFontSystem kCTFontSystemFontType
160 # define kCTFontUIFontEmphasizedSystem kCTFontEmphasizedSystemFontType
161 #endif
162 CTFontUIFontType font_type = kCTFontUIFontSystem;
163 if (CFStringHasSuffix (cg_postscript_name, CFSTR ("-Bold")))
164 font_type = kCTFontUIFontEmphasizedSystem;
165
166 ct_font = CTFontCreateUIFontForLanguage (font_type, font_size, nullptr);
167 CFStringRef ct_result_name = CTFontCopyPostScriptName(ct_font);
168 if (CFStringCompare (ct_result_name, cg_postscript_name, 0) != kCFCompareEqualTo)
169 {
170 CFRelease(ct_font);
171 ct_font = nullptr;
172 }
173 CFRelease (ct_result_name);
174 }
175 CFRelease (cg_postscript_name);
176
177 if (!ct_font)
178 ct_font = CTFontCreateWithGraphicsFont (cg_font, font_size, nullptr, nullptr);
179
180 if (unlikely (!ct_font)) {
181 DEBUG_MSG (CORETEXT, cg_font, "Font CTFontCreateWithGraphicsFont() failed");
182 return nullptr;
183 }
184
185 /* crbug.com/576941 and crbug.com/625902 and the investigation in the latter
186 * bug indicate that the cascade list reconfiguration occasionally causes
187 * crashes in CoreText on OS X 10.9, thus let's skip this step on older
188 * operating system versions. Except for the emoji font, where _not_
189 * reconfiguring the cascade list causes CoreText crashes. For details, see
190 * crbug.com/549610 */
191 // 0x00070000 stands for "kCTVersionNumber10_10", see CoreText.h
192 #pragma GCC diagnostic push
193 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
194 if (&CTGetCoreTextVersion != nullptr && CTGetCoreTextVersion() < 0x00070000) {
195 #pragma GCC diagnostic pop
196 CFStringRef fontName = CTFontCopyPostScriptName (ct_font);
197 bool isEmojiFont = CFStringCompare (fontName, CFSTR("AppleColorEmoji"), 0) == kCFCompareEqualTo;
198 CFRelease (fontName);
199 if (!isEmojiFont)
200 return ct_font;
201 }
202
203 CFURLRef original_url = nullptr;
204 #if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1060
205 ATSFontRef atsFont;
206 FSRef fsref;
207 OSStatus status;
208 atsFont = CTFontGetPlatformFont (ct_font, NULL);
209 status = ATSFontGetFileReference (atsFont, &fsref);
210 if (status == noErr)
211 original_url = CFURLCreateFromFSRef (NULL, &fsref);
212 #else
213 original_url = (CFURLRef) CTFontCopyAttribute (ct_font, kCTFontURLAttribute);
214 #endif
215
216 /* Create font copy with cascade list that has LastResort first; this speeds up CoreText
217 * font fallback which we don't need anyway. */
218 {
219 CTFontDescriptorRef last_resort_font_desc = get_last_resort_font_desc ();
220 CTFontRef new_ct_font = CTFontCreateCopyWithAttributes (ct_font, 0.0, nullptr, last_resort_font_desc);
221 CFRelease (last_resort_font_desc);
222 if (new_ct_font)
223 {
224 /* The CTFontCreateCopyWithAttributes call fails to stay on the same font
225 * when reconfiguring the cascade list and may switch to a different font
226 * when there are fonts that go by the same name, since the descriptor is
227 * just name and size.
228 *
229 * Avoid reconfiguring the cascade lists if the new font is outside the
230 * system locations that we cannot access from the sandboxed renderer
231 * process in Blink. This can be detected by the new file URL location
232 * that the newly found font points to. */
233 CFURLRef new_url = nullptr;
234 #if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1060
235 atsFont = CTFontGetPlatformFont (new_ct_font, NULL);
236 status = ATSFontGetFileReference (atsFont, &fsref);
237 if (status == noErr)
238 new_url = CFURLCreateFromFSRef (NULL, &fsref);
239 #else
240 new_url = (CFURLRef) CTFontCopyAttribute (new_ct_font, kCTFontURLAttribute);
241 #endif
242 // Keep reconfigured font if URL cannot be retrieved (seems to be the case
243 // on Mac OS 10.12 Sierra), speculative fix for crbug.com/625606
244 if (!original_url || !new_url || CFEqual (original_url, new_url)) {
245 CFRelease (ct_font);
246 ct_font = new_ct_font;
247 } else {
248 CFRelease (new_ct_font);
249 DEBUG_MSG (CORETEXT, ct_font, "Discarding reconfigured CTFont, location changed.");
250 }
251 if (new_url)
252 CFRelease (new_url);
253 }
254 else
255 DEBUG_MSG (CORETEXT, ct_font, "Font copy with empty cascade list failed");
256 }
257
258 if (original_url)
259 CFRelease (original_url);
260 return ct_font;
261 }
262
263 hb_coretext_face_data_t *
_hb_coretext_shaper_face_data_create(hb_face_t * face)264 _hb_coretext_shaper_face_data_create (hb_face_t *face)
265 {
266 CGFontRef cg_font = create_cg_font (face);
267
268 if (unlikely (!cg_font))
269 {
270 DEBUG_MSG (CORETEXT, face, "CGFont creation failed..");
271 return nullptr;
272 }
273
274 return (hb_coretext_face_data_t *) cg_font;
275 }
276
277 void
_hb_coretext_shaper_face_data_destroy(hb_coretext_face_data_t * data)278 _hb_coretext_shaper_face_data_destroy (hb_coretext_face_data_t *data)
279 {
280 CFRelease ((CGFontRef) data);
281 }
282
283 /**
284 * hb_coretext_face_create:
285 * @cg_font: The CGFontRef to work upon
286 *
287 * Creates an #hb_face_t face object from the specified
288 * CGFontRef.
289 *
290 * Return value: the new #hb_face_t face object
291 *
292 * Since: 0.9.10
293 */
294 hb_face_t *
hb_coretext_face_create(CGFontRef cg_font)295 hb_coretext_face_create (CGFontRef cg_font)
296 {
297 return hb_face_create_for_tables (_hb_cg_reference_table, CGFontRetain (cg_font), _hb_cg_font_release);
298 }
299
300 /**
301 * hb_coretext_face_get_cg_font:
302 * @face: The #hb_face_t to work upon
303 *
304 * Fetches the CGFontRef associated with an #hb_face_t
305 * face object
306 *
307 * Return value: the CGFontRef found
308 *
309 * Since: 0.9.10
310 */
311 CGFontRef
hb_coretext_face_get_cg_font(hb_face_t * face)312 hb_coretext_face_get_cg_font (hb_face_t *face)
313 {
314 return (CGFontRef) (const void *) face->data.coretext;
315 }
316
317
318 hb_coretext_font_data_t *
_hb_coretext_shaper_font_data_create(hb_font_t * font)319 _hb_coretext_shaper_font_data_create (hb_font_t *font)
320 {
321 hb_face_t *face = font->face;
322 const hb_coretext_face_data_t *face_data = face->data.coretext;
323 if (unlikely (!face_data)) return nullptr;
324 CGFontRef cg_font = (CGFontRef) (const void *) face->data.coretext;
325
326 CGFloat font_size = (CGFloat) (font->ptem <= 0.f ? HB_CORETEXT_DEFAULT_FONT_SIZE : font->ptem);
327 CTFontRef ct_font = create_ct_font (cg_font, font_size);
328
329 if (unlikely (!ct_font))
330 {
331 DEBUG_MSG (CORETEXT, font, "CGFont creation failed..");
332 return nullptr;
333 }
334
335 return (hb_coretext_font_data_t *) ct_font;
336 }
337
338 void
_hb_coretext_shaper_font_data_destroy(hb_coretext_font_data_t * data)339 _hb_coretext_shaper_font_data_destroy (hb_coretext_font_data_t *data)
340 {
341 CFRelease ((CTFontRef) data);
342 }
343
344 static const hb_coretext_font_data_t *
hb_coretext_font_data_sync(hb_font_t * font)345 hb_coretext_font_data_sync (hb_font_t *font)
346 {
347 retry:
348 const hb_coretext_font_data_t *data = font->data.coretext;
349 if (unlikely (!data)) return nullptr;
350
351 if (fabs (CTFontGetSize ((CTFontRef) data) - (CGFloat) font->ptem) > (CGFloat) .5)
352 {
353 /* XXX-MT-bug
354 * Note that evaluating condition above can be dangerous if another thread
355 * got here first and destructed data. That's, as always, bad use pattern.
356 * If you modify the font (change font size), other threads must not be
357 * using it at the same time. However, since this check is delayed to
358 * when one actually tries to shape something, this is a XXX race condition
359 * (and the only one we have that I know of) right now. Ie. you modify the
360 * font size in one thread, then (supposedly safely) try to use it from two
361 * or more threads and BOOM! I'm not sure how to fix this. We want RCU.
362 */
363
364 /* Drop and recreate. */
365 /* If someone dropped it in the mean time, throw it away and don't touch it.
366 * Otherwise, destruct it. */
367 if (likely (font->data.coretext.cmpexch (const_cast<hb_coretext_font_data_t *> (data), nullptr)))
368 _hb_coretext_shaper_font_data_destroy (const_cast<hb_coretext_font_data_t *> (data));
369 else
370 goto retry;
371 }
372 return font->data.coretext;
373 }
374
375 /**
376 * hb_coretext_font_create:
377 * @ct_font: The CTFontRef to work upon
378 *
379 * Creates an #hb_font_t font object from the specified
380 * CTFontRef.
381 *
382 * Return value: the new #hb_font_t font object
383 *
384 * Since: 1.7.2
385 **/
386 hb_font_t *
hb_coretext_font_create(CTFontRef ct_font)387 hb_coretext_font_create (CTFontRef ct_font)
388 {
389 CGFontRef cg_font = CTFontCopyGraphicsFont (ct_font, nullptr);
390 hb_face_t *face = hb_coretext_face_create (cg_font);
391 CFRelease (cg_font);
392 hb_font_t *font = hb_font_create (face);
393 hb_face_destroy (face);
394
395 if (unlikely (hb_object_is_immutable (font)))
396 return font;
397
398 hb_font_set_ptem (font, CTFontGetSize (ct_font));
399
400 /* Let there be dragons here... */
401 font->data.coretext.cmpexch (nullptr, (hb_coretext_font_data_t *) CFRetain (ct_font));
402
403 return font;
404 }
405
406 /**
407 * hb_coretext_font_get_ct_font:
408 * @font: #hb_font_t to work upon
409 *
410 * Fetches the CTFontRef associated with the specified
411 * #hb_font_t font object.
412 *
413 * Return value: the CTFontRef found
414 *
415 * Since: 0.9.10
416 */
417 CTFontRef
hb_coretext_font_get_ct_font(hb_font_t * font)418 hb_coretext_font_get_ct_font (hb_font_t *font)
419 {
420 const hb_coretext_font_data_t *data = hb_coretext_font_data_sync (font);
421 return data ? (CTFontRef) data : nullptr;
422 }
423
424
425 /*
426 * shaper
427 */
428
429 struct feature_record_t {
430 unsigned int feature;
431 unsigned int setting;
432 };
433
434 struct active_feature_t {
435 feature_record_t rec;
436 unsigned int order;
437
cmpactive_feature_t438 HB_INTERNAL static int cmp (const void *pa, const void *pb) {
439 const active_feature_t *a = (const active_feature_t *) pa;
440 const active_feature_t *b = (const active_feature_t *) pb;
441 return a->rec.feature < b->rec.feature ? -1 : a->rec.feature > b->rec.feature ? 1 :
442 a->order < b->order ? -1 : a->order > b->order ? 1 :
443 a->rec.setting < b->rec.setting ? -1 : a->rec.setting > b->rec.setting ? 1 :
444 0;
445 }
operator ==active_feature_t446 bool operator== (const active_feature_t *f) {
447 return cmp (this, f) == 0;
448 }
449 };
450
451 struct feature_event_t {
452 unsigned int index;
453 bool start;
454 active_feature_t feature;
455
cmpfeature_event_t456 HB_INTERNAL static int cmp (const void *pa, const void *pb) {
457 const feature_event_t *a = (const feature_event_t *) pa;
458 const feature_event_t *b = (const feature_event_t *) pb;
459 return a->index < b->index ? -1 : a->index > b->index ? 1 :
460 a->start < b->start ? -1 : a->start > b->start ? 1 :
461 active_feature_t::cmp (&a->feature, &b->feature);
462 }
463 };
464
465 struct range_record_t {
466 CTFontRef font;
467 unsigned int index_first; /* == start */
468 unsigned int index_last; /* == end - 1 */
469 };
470
471
472 hb_bool_t
_hb_coretext_shape(hb_shape_plan_t * shape_plan,hb_font_t * font,hb_buffer_t * buffer,const hb_feature_t * features,unsigned int num_features)473 _hb_coretext_shape (hb_shape_plan_t *shape_plan,
474 hb_font_t *font,
475 hb_buffer_t *buffer,
476 const hb_feature_t *features,
477 unsigned int num_features)
478 {
479 hb_face_t *face = font->face;
480 CGFontRef cg_font = (CGFontRef) (const void *) face->data.coretext;
481 CTFontRef ct_font = (CTFontRef) hb_coretext_font_data_sync (font);
482
483 CGFloat ct_font_size = CTFontGetSize (ct_font);
484 CGFloat x_mult = (CGFloat) font->x_scale / ct_font_size;
485 CGFloat y_mult = (CGFloat) font->y_scale / ct_font_size;
486
487 /* Attach marks to their bases, to match the 'ot' shaper.
488 * Adapted from a very old version of hb-ot-shape:hb_form_clusters().
489 * Note that this only makes us be closer to the 'ot' shaper,
490 * but by no means the same. For example, if there's
491 * B1 M1 B2 M2, and B1-B2 form a ligature, M2's cluster will
492 * continue pointing to B2 even though B2 was merged into B1's
493 * cluster... */
494 if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES)
495 {
496 hb_unicode_funcs_t *unicode = buffer->unicode;
497 unsigned int count = buffer->len;
498 hb_glyph_info_t *info = buffer->info;
499 for (unsigned int i = 1; i < count; i++)
500 if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (unicode->general_category (info[i].codepoint)))
501 buffer->merge_clusters (i - 1, i + 1);
502 }
503
504 hb_vector_t<feature_record_t> feature_records;
505 hb_vector_t<range_record_t> range_records;
506
507 /*
508 * Set up features.
509 * (copied + modified from code from hb-uniscribe.cc)
510 */
511 if (num_features)
512 {
513 /* Sort features by start/end events. */
514 hb_vector_t<feature_event_t> feature_events;
515 for (unsigned int i = 0; i < num_features; i++)
516 {
517 active_feature_t feature;
518
519 #if MAC_OS_X_VERSION_MIN_REQUIRED < 101000
520 const hb_aat_feature_mapping_t * mapping = hb_aat_layout_find_feature_mapping (features[i].tag);
521 if (!mapping)
522 continue;
523
524 feature.rec.feature = mapping->aatFeatureType;
525 feature.rec.setting = features[i].value ? mapping->selectorToEnable : mapping->selectorToDisable;
526 #else
527 feature.rec.feature = features[i].tag;
528 feature.rec.setting = features[i].value;
529 #endif
530 feature.order = i;
531
532 feature_event_t *event;
533
534 event = feature_events.push ();
535 event->index = features[i].start;
536 event->start = true;
537 event->feature = feature;
538
539 event = feature_events.push ();
540 event->index = features[i].end;
541 event->start = false;
542 event->feature = feature;
543 }
544 feature_events.qsort ();
545 /* Add a strategic final event. */
546 {
547 active_feature_t feature;
548 feature.rec.feature = HB_TAG_NONE;
549 feature.rec.setting = 0;
550 feature.order = num_features + 1;
551
552 feature_event_t *event = feature_events.push ();
553 event->index = 0; /* This value does magic. */
554 event->start = false;
555 event->feature = feature;
556 }
557
558 /* Scan events and save features for each range. */
559 hb_vector_t<active_feature_t> active_features;
560 unsigned int last_index = 0;
561 for (unsigned int i = 0; i < feature_events.length; i++)
562 {
563 feature_event_t *event = &feature_events[i];
564
565 if (event->index != last_index)
566 {
567 /* Save a snapshot of active features and the range. */
568 range_record_t *range = range_records.push ();
569
570 if (active_features.length)
571 {
572 CFMutableArrayRef features_array = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
573
574 /* TODO sort and resolve conflicting features? */
575 /* active_features.qsort (); */
576 for (unsigned int j = 0; j < active_features.length; j++)
577 {
578 #if MAC_OS_X_VERSION_MIN_REQUIRED < 101000
579 CFStringRef keys[] = {
580 kCTFontFeatureTypeIdentifierKey,
581 kCTFontFeatureSelectorIdentifierKey
582 };
583 CFNumberRef values[] = {
584 CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.feature),
585 CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting)
586 };
587 #else
588 char tag[5] = {HB_UNTAG (active_features[j].rec.feature)};
589 CFTypeRef keys[] = {
590 kCTFontOpenTypeFeatureTag,
591 kCTFontOpenTypeFeatureValue
592 };
593 CFTypeRef values[] = {
594 CFStringCreateWithCString (kCFAllocatorDefault, tag, kCFStringEncodingASCII),
595 CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting)
596 };
597 #endif
598 static_assert ((ARRAY_LENGTH_CONST (keys) == ARRAY_LENGTH_CONST (values)), "");
599 CFDictionaryRef dict = CFDictionaryCreate (kCFAllocatorDefault,
600 (const void **) keys,
601 (const void **) values,
602 ARRAY_LENGTH (keys),
603 &kCFTypeDictionaryKeyCallBacks,
604 &kCFTypeDictionaryValueCallBacks);
605 for (unsigned int i = 0; i < ARRAY_LENGTH (values); i++)
606 CFRelease (values[i]);
607
608 CFArrayAppendValue (features_array, dict);
609 CFRelease (dict);
610
611 }
612
613 CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,
614 (const void **) &kCTFontFeatureSettingsAttribute,
615 (const void **) &features_array,
616 1,
617 &kCFTypeDictionaryKeyCallBacks,
618 &kCFTypeDictionaryValueCallBacks);
619 CFRelease (features_array);
620
621 CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);
622 CFRelease (attributes);
623
624 range->font = CTFontCreateCopyWithAttributes (ct_font, 0.0, nullptr, font_desc);
625 CFRelease (font_desc);
626 }
627 else
628 {
629 range->font = nullptr;
630 }
631
632 range->index_first = last_index;
633 range->index_last = event->index - 1;
634
635 last_index = event->index;
636 }
637
638 if (event->start)
639 {
640 active_features.push (event->feature);
641 } else {
642 active_feature_t *feature = active_features.find (&event->feature);
643 if (feature)
644 active_features.remove (feature - active_features.arrayZ);
645 }
646 }
647 }
648
649 unsigned int scratch_size;
650 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
651
652 #define ALLOCATE_ARRAY(Type, name, len, on_no_room) \
653 Type *name = (Type *) scratch; \
654 do { \
655 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
656 if (unlikely (_consumed > scratch_size)) \
657 { \
658 on_no_room; \
659 assert (0); \
660 } \
661 scratch += _consumed; \
662 scratch_size -= _consumed; \
663 } while (0)
664
665 ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2, ((void)nullptr) /*nothing*/);
666 unsigned int chars_len = 0;
667 for (unsigned int i = 0; i < buffer->len; i++) {
668 hb_codepoint_t c = buffer->info[i].codepoint;
669 if (likely (c <= 0xFFFFu))
670 pchars[chars_len++] = c;
671 else if (unlikely (c > 0x10FFFFu))
672 pchars[chars_len++] = 0xFFFDu;
673 else {
674 pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10);
675 pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1u << 10) - 1));
676 }
677 }
678
679 ALLOCATE_ARRAY (unsigned int, log_clusters, chars_len, ((void)nullptr) /*nothing*/);
680 chars_len = 0;
681 for (unsigned int i = 0; i < buffer->len; i++)
682 {
683 hb_codepoint_t c = buffer->info[i].codepoint;
684 unsigned int cluster = buffer->info[i].cluster;
685 log_clusters[chars_len++] = cluster;
686 if (hb_in_range (c, 0x10000u, 0x10FFFFu))
687 log_clusters[chars_len++] = cluster; /* Surrogates. */
688 }
689
690 #define FAIL(...) \
691 HB_STMT_START { \
692 DEBUG_MSG (CORETEXT, nullptr, __VA_ARGS__); \
693 ret = false; \
694 goto fail; \
695 } HB_STMT_END
696
697 bool ret = true;
698 CFStringRef string_ref = nullptr;
699 CTLineRef line = nullptr;
700
701 if (false)
702 {
703 resize_and_retry:
704 DEBUG_MSG (CORETEXT, buffer, "Buffer resize");
705 /* string_ref uses the scratch-buffer for backing store, and line references
706 * string_ref (via attr_string). We must release those before resizing buffer. */
707 assert (string_ref);
708 assert (line);
709 CFRelease (string_ref);
710 CFRelease (line);
711 string_ref = nullptr;
712 line = nullptr;
713
714 /* Get previous start-of-scratch-area, that we use later for readjusting
715 * our existing scratch arrays. */
716 unsigned int old_scratch_used;
717 hb_buffer_t::scratch_buffer_t *old_scratch;
718 old_scratch = buffer->get_scratch_buffer (&old_scratch_used);
719 old_scratch_used = scratch - old_scratch;
720
721 if (unlikely (!buffer->ensure (buffer->allocated * 2)))
722 FAIL ("Buffer resize failed");
723
724 /* Adjust scratch, pchars, and log_cluster arrays. This is ugly, but really the
725 * cleanest way to do without completely restructuring the rest of this shaper. */
726 scratch = buffer->get_scratch_buffer (&scratch_size);
727 pchars = reinterpret_cast<UniChar *> (((char *) scratch + ((char *) pchars - (char *) old_scratch)));
728 log_clusters = reinterpret_cast<unsigned int *> (((char *) scratch + ((char *) log_clusters - (char *) old_scratch)));
729 scratch += old_scratch_used;
730 scratch_size -= old_scratch_used;
731 }
732 {
733 string_ref = CFStringCreateWithCharactersNoCopy (nullptr,
734 pchars, chars_len,
735 kCFAllocatorNull);
736 if (unlikely (!string_ref))
737 FAIL ("CFStringCreateWithCharactersNoCopy failed");
738
739 /* Create an attributed string, populate it, and create a line from it, then release attributed string. */
740 {
741 CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (kCFAllocatorDefault,
742 chars_len);
743 if (unlikely (!attr_string))
744 FAIL ("CFAttributedStringCreateMutable failed");
745 CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref);
746 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
747 {
748 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
749 kCTVerticalFormsAttributeName, kCFBooleanTrue);
750 }
751
752 if (buffer->props.language)
753 {
754 /* What's the iOS equivalent of this check?
755 * The symbols was introduced in iOS 7.0.
756 * At any rate, our fallback is safe and works fine. */
757 #if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1090
758 # define kCTLanguageAttributeName CFSTR ("NSLanguage")
759 #endif
760 CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault,
761 hb_language_to_string (buffer->props.language),
762 kCFStringEncodingUTF8,
763 kCFAllocatorNull);
764 if (unlikely (!lang))
765 {
766 CFRelease (attr_string);
767 FAIL ("CFStringCreateWithCStringNoCopy failed");
768 }
769 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
770 kCTLanguageAttributeName, lang);
771 CFRelease (lang);
772 }
773 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
774 kCTFontAttributeName, ct_font);
775
776 if (num_features && range_records.length)
777 {
778 unsigned int start = 0;
779 range_record_t *last_range = &range_records[0];
780 for (unsigned int k = 0; k < chars_len; k++)
781 {
782 range_record_t *range = last_range;
783 while (log_clusters[k] < range->index_first)
784 range--;
785 while (log_clusters[k] > range->index_last)
786 range++;
787 if (range != last_range)
788 {
789 if (last_range->font)
790 CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, k - start),
791 kCTFontAttributeName, last_range->font);
792
793 start = k;
794 }
795
796 last_range = range;
797 }
798 if (start != chars_len && last_range->font)
799 CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, chars_len - start),
800 kCTFontAttributeName, last_range->font);
801 }
802 /* Enable/disable kern if requested.
803 *
804 * Note: once kern is disabled, reenabling it doesn't currently seem to work in CoreText.
805 */
806 if (num_features)
807 {
808 unsigned int zeroint = 0;
809 CFNumberRef zero = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &zeroint);
810 for (unsigned int i = 0; i < num_features; i++)
811 {
812 const hb_feature_t &feature = features[i];
813 if (feature.tag == HB_TAG('k','e','r','n') &&
814 feature.start < chars_len && feature.start < feature.end)
815 {
816 CFRange feature_range = CFRangeMake (feature.start,
817 hb_min (feature.end, chars_len) - feature.start);
818 if (feature.value)
819 CFAttributedStringRemoveAttribute (attr_string, feature_range, kCTKernAttributeName);
820 else
821 CFAttributedStringSetAttribute (attr_string, feature_range, kCTKernAttributeName, zero);
822 }
823 }
824 CFRelease (zero);
825 }
826
827 int level = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;
828 CFNumberRef level_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &level);
829 #if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1060
830 extern const CFStringRef kCTTypesetterOptionForcedEmbeddingLevel;
831 #endif
832 CFDictionaryRef options = CFDictionaryCreate (kCFAllocatorDefault,
833 (const void **) &kCTTypesetterOptionForcedEmbeddingLevel,
834 (const void **) &level_number,
835 1,
836 &kCFTypeDictionaryKeyCallBacks,
837 &kCFTypeDictionaryValueCallBacks);
838 CFRelease (level_number);
839 if (unlikely (!options))
840 {
841 CFRelease (attr_string);
842 FAIL ("CFDictionaryCreate failed");
843 }
844
845 CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions (attr_string, options);
846 CFRelease (options);
847 CFRelease (attr_string);
848 if (unlikely (!typesetter))
849 FAIL ("CTTypesetterCreateWithAttributedStringAndOptions failed");
850
851 line = CTTypesetterCreateLine (typesetter, CFRangeMake(0, 0));
852 CFRelease (typesetter);
853 if (unlikely (!line))
854 FAIL ("CTTypesetterCreateLine failed");
855 }
856
857 CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
858 unsigned int num_runs = CFArrayGetCount (glyph_runs);
859 DEBUG_MSG (CORETEXT, nullptr, "Num runs: %d", num_runs);
860
861 buffer->len = 0;
862 uint32_t status_and = ~0, status_or = 0;
863 CGFloat advances_so_far = 0;
864 /* For right-to-left runs, CoreText returns the glyphs positioned such that
865 * any trailing whitespace is to the left of (0,0). Adjust coordinate system
866 * to fix for that. Test with any RTL string with trailing spaces.
867 * https://crbug.com/469028
868 */
869 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
870 {
871 advances_so_far -= CTLineGetTrailingWhitespaceWidth (line);
872 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
873 advances_so_far = -advances_so_far;
874 }
875
876 const CFRange range_all = CFRangeMake (0, 0);
877
878 for (unsigned int i = 0; i < num_runs; i++)
879 {
880 CTRunRef run = static_cast<CTRunRef>(CFArrayGetValueAtIndex (glyph_runs, i));
881 CTRunStatus run_status = CTRunGetStatus (run);
882 status_or |= run_status;
883 status_and &= run_status;
884 DEBUG_MSG (CORETEXT, run, "CTRunStatus: %x", run_status);
885 CGFloat run_advance = CTRunGetTypographicBounds (run, range_all, nullptr, nullptr, nullptr);
886 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
887 run_advance = -run_advance;
888 DEBUG_MSG (CORETEXT, run, "Run advance: %g", (double) run_advance);
889
890 /* CoreText does automatic font fallback (AKA "cascading") for characters
891 * not supported by the requested font, and provides no way to turn it off,
892 * so we must detect if the returned run uses a font other than the requested
893 * one and fill in the buffer with .notdef glyphs instead of random glyph
894 * indices from a different font.
895 */
896 CFDictionaryRef attributes = CTRunGetAttributes (run);
897 CTFontRef run_ct_font = static_cast<CTFontRef>(CFDictionaryGetValue (attributes, kCTFontAttributeName));
898 if (!CFEqual (run_ct_font, ct_font))
899 {
900 /* The run doesn't use our main font instance. We have to figure out
901 * whether font fallback happened, or this is just CoreText giving us
902 * another CTFont using the same underlying CGFont. CoreText seems
903 * to do that in a variety of situations, one of which being vertical
904 * text, but also perhaps for caching reasons.
905 *
906 * First, see if it uses any of our subfonts created to set font features...
907 *
908 * Next, compare the CGFont to the one we used to create our fonts.
909 * Even this doesn't work all the time.
910 *
911 * Finally, we compare PS names, which I don't think are unique...
912 *
913 * Looks like if we really want to be sure here we have to modify the
914 * font to change the name table, similar to what we do in the uniscribe
915 * backend.
916 *
917 * However, even that wouldn't work if we were passed in the CGFont to
918 * construct a hb_face to begin with.
919 *
920 * See: https://github.com/harfbuzz/harfbuzz/pull/36
921 *
922 * Also see: https://bugs.chromium.org/p/chromium/issues/detail?id=597098
923 */
924 bool matched = false;
925 for (unsigned int i = 0; i < range_records.length; i++)
926 if (range_records[i].font && CFEqual (run_ct_font, range_records[i].font))
927 {
928 matched = true;
929 break;
930 }
931 if (!matched)
932 {
933 CGFontRef run_cg_font = CTFontCopyGraphicsFont (run_ct_font, nullptr);
934 if (run_cg_font)
935 {
936 matched = CFEqual (run_cg_font, cg_font);
937 CFRelease (run_cg_font);
938 }
939 }
940 if (!matched)
941 {
942 CFStringRef font_ps_name = CTFontCopyName (ct_font, kCTFontPostScriptNameKey);
943 CFStringRef run_ps_name = CTFontCopyName (run_ct_font, kCTFontPostScriptNameKey);
944 CFComparisonResult result = CFStringCompare (run_ps_name, font_ps_name, 0);
945 CFRelease (run_ps_name);
946 CFRelease (font_ps_name);
947 if (result == kCFCompareEqualTo)
948 matched = true;
949 }
950 if (!matched)
951 {
952 CFRange range = CTRunGetStringRange (run);
953 DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld",
954 range.location, range.location + range.length);
955 if (!buffer->ensure_inplace (buffer->len + range.length))
956 goto resize_and_retry;
957 hb_glyph_info_t *info = buffer->info + buffer->len;
958
959 hb_codepoint_t notdef = 0;
960 hb_direction_t dir = buffer->props.direction;
961 hb_position_t x_advance, y_advance, x_offset, y_offset;
962 hb_font_get_glyph_advance_for_direction (font, notdef, dir, &x_advance, &y_advance);
963 hb_font_get_glyph_origin_for_direction (font, notdef, dir, &x_offset, &y_offset);
964 hb_position_t advance = x_advance + y_advance;
965 x_offset = -x_offset;
966 y_offset = -y_offset;
967
968 unsigned int old_len = buffer->len;
969 for (CFIndex j = range.location; j < range.location + range.length; j++)
970 {
971 UniChar ch = CFStringGetCharacterAtIndex (string_ref, j);
972 if (hb_in_range<UniChar> (ch, 0xDC00u, 0xDFFFu) && range.location < j)
973 {
974 ch = CFStringGetCharacterAtIndex (string_ref, j - 1);
975 if (hb_in_range<UniChar> (ch, 0xD800u, 0xDBFFu))
976 /* This is the second of a surrogate pair. Don't need .notdef
977 * for this one. */
978 continue;
979 }
980 if (buffer->unicode->is_default_ignorable (ch))
981 continue;
982
983 info->codepoint = notdef;
984 info->cluster = log_clusters[j];
985
986 info->mask = advance;
987 info->var1.i32 = x_offset;
988 info->var2.i32 = y_offset;
989
990 info++;
991 buffer->len++;
992 }
993 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
994 buffer->reverse_range (old_len, buffer->len);
995 advances_so_far += run_advance;
996 continue;
997 }
998 }
999
1000 unsigned int num_glyphs = CTRunGetGlyphCount (run);
1001 if (num_glyphs == 0)
1002 continue;
1003
1004 if (!buffer->ensure_inplace (buffer->len + num_glyphs))
1005 goto resize_and_retry;
1006
1007 hb_glyph_info_t *run_info = buffer->info + buffer->len;
1008
1009 /* Testing used to indicate that CTRunGetGlyphsPtr, etc (almost?) always
1010 * succeed, and so copying data to our own buffer will be rare. Reports
1011 * have it that this changed in OS X 10.10 Yosemite, and nullptr is returned
1012 * frequently. At any rate, we can test that codepath by setting USE_PTR
1013 * to false. */
1014
1015 #define USE_PTR true
1016
1017 #define SCRATCH_SAVE() \
1018 unsigned int scratch_size_saved = scratch_size; \
1019 hb_buffer_t::scratch_buffer_t *scratch_saved = scratch
1020
1021 #define SCRATCH_RESTORE() \
1022 scratch_size = scratch_size_saved; \
1023 scratch = scratch_saved
1024
1025 { /* Setup glyphs */
1026 SCRATCH_SAVE();
1027 const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : nullptr;
1028 if (!glyphs) {
1029 ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry);
1030 CTRunGetGlyphs (run, range_all, glyph_buf);
1031 glyphs = glyph_buf;
1032 }
1033 const CFIndex* string_indices = USE_PTR ? CTRunGetStringIndicesPtr (run) : nullptr;
1034 if (!string_indices) {
1035 ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs, goto resize_and_retry);
1036 CTRunGetStringIndices (run, range_all, index_buf);
1037 string_indices = index_buf;
1038 }
1039 hb_glyph_info_t *info = run_info;
1040 for (unsigned int j = 0; j < num_glyphs; j++)
1041 {
1042 info->codepoint = glyphs[j];
1043 info->cluster = log_clusters[string_indices[j]];
1044 info++;
1045 }
1046 SCRATCH_RESTORE();
1047 }
1048 {
1049 /* Setup positions.
1050 * Note that CoreText does not return advances for glyphs. As such,
1051 * for all but last glyph, we use the delta position to next glyph as
1052 * advance (in the advance direction only), and for last glyph we set
1053 * whatever is needed to make the whole run's advance add up. */
1054 SCRATCH_SAVE();
1055 const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : nullptr;
1056 if (!positions) {
1057 ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry);
1058 CTRunGetPositions (run, range_all, position_buf);
1059 positions = position_buf;
1060 }
1061 hb_glyph_info_t *info = run_info;
1062 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
1063 {
1064 hb_position_t x_offset = (positions[0].x - advances_so_far) * x_mult;
1065 for (unsigned int j = 0; j < num_glyphs; j++)
1066 {
1067 CGFloat advance;
1068 if (likely (j + 1 < num_glyphs))
1069 advance = positions[j + 1].x - positions[j].x;
1070 else /* last glyph */
1071 advance = run_advance - (positions[j].x - positions[0].x);
1072 info->mask = advance * x_mult;
1073 info->var1.i32 = x_offset;
1074 info->var2.i32 = positions[j].y * y_mult;
1075 info++;
1076 }
1077 }
1078 else
1079 {
1080 hb_position_t y_offset = (positions[0].y - advances_so_far) * y_mult;
1081 for (unsigned int j = 0; j < num_glyphs; j++)
1082 {
1083 CGFloat advance;
1084 if (likely (j + 1 < num_glyphs))
1085 advance = positions[j + 1].y - positions[j].y;
1086 else /* last glyph */
1087 advance = run_advance - (positions[j].y - positions[0].y);
1088 info->mask = advance * y_mult;
1089 info->var1.i32 = positions[j].x * x_mult;
1090 info->var2.i32 = y_offset;
1091 info++;
1092 }
1093 }
1094 SCRATCH_RESTORE();
1095 advances_so_far += run_advance;
1096 }
1097 #undef SCRATCH_RESTORE
1098 #undef SCRATCH_SAVE
1099 #undef USE_PTR
1100 #undef ALLOCATE_ARRAY
1101
1102 buffer->len += num_glyphs;
1103 }
1104
1105 /* Mac OS 10.6 doesn't have kCTTypesetterOptionForcedEmbeddingLevel,
1106 * or if it does, it doesn't respect it. So we get runs with wrong
1107 * directions. As such, disable the assert... It wouldn't crash, but
1108 * cursoring will be off...
1109 *
1110 * https://crbug.com/419769
1111 */
1112 if (false)
1113 {
1114 /* Make sure all runs had the expected direction. */
1115 HB_UNUSED bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
1116 assert (bool (status_and & kCTRunStatusRightToLeft) == backward);
1117 assert (bool (status_or & kCTRunStatusRightToLeft) == backward);
1118 }
1119
1120 buffer->clear_positions ();
1121
1122 unsigned int count = buffer->len;
1123 hb_glyph_info_t *info = buffer->info;
1124 hb_glyph_position_t *pos = buffer->pos;
1125 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
1126 for (unsigned int i = 0; i < count; i++)
1127 {
1128 pos->x_advance = info->mask;
1129 pos->x_offset = info->var1.i32;
1130 pos->y_offset = info->var2.i32;
1131
1132 info++, pos++;
1133 }
1134 else
1135 for (unsigned int i = 0; i < count; i++)
1136 {
1137 pos->y_advance = info->mask;
1138 pos->x_offset = info->var1.i32;
1139 pos->y_offset = info->var2.i32;
1140
1141 info++, pos++;
1142 }
1143
1144 /* Fix up clusters so that we never return out-of-order indices;
1145 * if core text has reordered glyphs, we'll merge them to the
1146 * beginning of the reordered cluster. CoreText is nice enough
1147 * to tell us whenever it has produced nonmonotonic results...
1148 * Note that we assume the input clusters were nonmonotonic to
1149 * begin with.
1150 *
1151 * This does *not* mean we'll form the same clusters as Uniscribe
1152 * or the native OT backend, only that the cluster indices will be
1153 * monotonic in the output buffer. */
1154 if (count > 1 && (status_or & kCTRunStatusNonMonotonic))
1155 {
1156 hb_glyph_info_t *info = buffer->info;
1157 if (HB_DIRECTION_IS_FORWARD (buffer->props.direction))
1158 {
1159 unsigned int cluster = info[count - 1].cluster;
1160 for (unsigned int i = count - 1; i > 0; i--)
1161 {
1162 cluster = hb_min (cluster, info[i - 1].cluster);
1163 info[i - 1].cluster = cluster;
1164 }
1165 }
1166 else
1167 {
1168 unsigned int cluster = info[0].cluster;
1169 for (unsigned int i = 1; i < count; i++)
1170 {
1171 cluster = hb_min (cluster, info[i].cluster);
1172 info[i].cluster = cluster;
1173 }
1174 }
1175 }
1176 }
1177
1178 buffer->unsafe_to_break_all ();
1179
1180 #undef FAIL
1181
1182 fail:
1183 if (string_ref)
1184 CFRelease (string_ref);
1185 if (line)
1186 CFRelease (line);
1187
1188 for (unsigned int i = 0; i < range_records.length; i++)
1189 if (range_records[i].font)
1190 CFRelease (range_records[i].font);
1191
1192 return ret;
1193 }
1194
1195
1196 #endif
1197