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 #define HB_SHAPER coretext
30 #include "hb-shaper-impl-private.hh"
31
32 #include "hb-coretext.h"
33
34
35 #ifndef HB_DEBUG_CORETEXT
36 #define HB_DEBUG_CORETEXT (HB_DEBUG+0)
37 #endif
38
39
40 static void
41 release_table_data (void *user_data)
42 {
43 CFDataRef cf_data = reinterpret_cast<CFDataRef> (user_data);
44 CFRelease(cf_data);
45 }
46
47 static hb_blob_t *
48 reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
49 {
50 CGFontRef cg_font = reinterpret_cast<CGFontRef> (user_data);
51 CFDataRef cf_data = CGFontCopyTableForTag (cg_font, tag);
52 if (unlikely (!cf_data))
53 return NULL;
54
55 const char *data = reinterpret_cast<const char*> (CFDataGetBytePtr (cf_data));
56 const size_t length = CFDataGetLength (cf_data);
57 if (!data || !length)
58 return NULL;
59
60 return hb_blob_create (data, length, HB_MEMORY_MODE_READONLY,
61 reinterpret_cast<void *> (const_cast<__CFData *> (cf_data)),
62 release_table_data);
63 }
64
65 hb_face_t *
66 hb_coretext_face_create (CGFontRef cg_font)
67 {
68 return hb_face_create_for_tables (reference_table, CGFontRetain (cg_font), (hb_destroy_func_t) CGFontRelease);
69 }
70
71
72 HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face)
73 HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font)
74
75
76 /*
77 * shaper face data
78 */
79
80 static CTFontDescriptorRef
81 get_last_resort_font_desc (void)
82 {
83 // TODO Handle allocation failures?
84 CTFontDescriptorRef last_resort = CTFontDescriptorCreateWithNameAndSize (CFSTR("LastResort"), 0);
85 CFArrayRef cascade_list = CFArrayCreate (kCFAllocatorDefault,
86 (const void **) &last_resort,
87 1,
88 &kCFTypeArrayCallBacks);
89 CFRelease (last_resort);
90 CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,
91 (const void **) &kCTFontCascadeListAttribute,
92 (const void **) &cascade_list,
93 1,
94 &kCFTypeDictionaryKeyCallBacks,
95 &kCFTypeDictionaryValueCallBacks);
96 CFRelease (cascade_list);
97
98 CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);
99 CFRelease (attributes);
100 return font_desc;
101 }
102
103 static void
104 release_data (void *info, const void *data, size_t size)
105 {
106 assert (hb_blob_get_length ((hb_blob_t *) info) == size &&
107 hb_blob_get_data ((hb_blob_t *) info, NULL) == data);
108
109 hb_blob_destroy ((hb_blob_t *) info);
110 }
111
112 static CGFontRef
113 create_cg_font (hb_face_t *face)
114 {
115 CGFontRef cg_font = NULL;
116 if (face->destroy == (hb_destroy_func_t) CGFontRelease)
117 {
118 cg_font = CGFontRetain ((CGFontRef) face->user_data);
119 }
120 else
121 {
122 hb_blob_t *blob = hb_face_reference_blob (face);
123 unsigned int blob_length;
124 const char *blob_data = hb_blob_get_data (blob, &blob_length);
125 if (unlikely (!blob_length))
126 DEBUG_MSG (CORETEXT, face, "Face has empty blob");
127
128 CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data);
129 if (likely (provider))
130 {
131 cg_font = CGFontCreateWithDataProvider (provider);
132 if (unlikely (!cg_font))
133 DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
134 CGDataProviderRelease (provider);
135 }
136 }
137 return cg_font;
138 }
139
140 static CTFontRef
141 create_ct_font (CGFontRef cg_font, CGFloat font_size)
142 {
143 CTFontRef ct_font = CTFontCreateWithGraphicsFont (cg_font, font_size, NULL, NULL);
144 if (unlikely (!ct_font)) {
145 DEBUG_MSG (CORETEXT, cg_font, "Font CTFontCreateWithGraphicsFont() failed");
146 return NULL;
147 }
148 CFURLRef original_url = (CFURLRef)CTFontCopyAttribute(ct_font, kCTFontURLAttribute);
149
150 /* Create font copy with cascade list that has LastResort first; this speeds up CoreText
151 * font fallback which we don't need anyway. */
152 {
153 CTFontDescriptorRef last_resort_font_desc = get_last_resort_font_desc ();
154 CTFontRef new_ct_font = CTFontCreateCopyWithAttributes (ct_font, 0.0, NULL, last_resort_font_desc);
155 CFRelease (last_resort_font_desc);
156 if (new_ct_font)
157 {
158 /* The CTFontCreateCopyWithAttributes call fails to stay on the same font
159 * when reconfiguring the cascade list and may switch to a different font
160 * when there are fonts that go by the same name, since the descriptor is
161 * just name and size.
162 *
163 * Avoid reconfiguring the cascade lists if the new font is outside the
164 * system locations that we cannot access from the sandboxed renderer
165 * process in Blink. This can be detected by the new file URL location
166 * that the newly found font points to. */
167 CFURLRef new_url = (CFURLRef) CTFontCopyAttribute (new_ct_font, kCTFontURLAttribute);
168 // Keep reconfigured font if URL cannot be retrieved (seems to be the case
169 // on Mac OS 10.12 Sierra), speculative fix for crbug.com/625606
170 if (!original_url || !new_url || CFEqual (original_url, new_url)) {
171 CFRelease (ct_font);
172 ct_font = new_ct_font;
173 } else {
174 CFRelease (new_ct_font);
175 DEBUG_MSG (CORETEXT, ct_font, "Discarding reconfigured CTFont, location changed.");
176 }
177 if (new_url)
178 CFRelease (new_url);
179 }
180 else
181 DEBUG_MSG (CORETEXT, ct_font, "Font copy with empty cascade list failed");
182 }
183
184 if (original_url)
185 CFRelease (original_url);
186 return ct_font;
187 }
188
189 struct hb_coretext_shaper_face_data_t {
190 CGFontRef cg_font;
191 CTFontRef ct_font;
192 };
193
194 hb_coretext_shaper_face_data_t *
195 _hb_coretext_shaper_face_data_create (hb_face_t *face)
196 {
197 hb_coretext_shaper_face_data_t *data = (hb_coretext_shaper_face_data_t *) calloc (1, sizeof (hb_coretext_shaper_face_data_t));
198 if (unlikely (!data))
199 return NULL;
200
201 data->cg_font = create_cg_font (face);
202 if (unlikely (!data->cg_font))
203 {
204 DEBUG_MSG (CORETEXT, face, "CGFont creation failed..");
205 free (data);
206 return NULL;
207 }
208
209 /* We use 36pt size instead of UPEM, because CoreText implements the 'trak' table,
210 * which can make the font too tight at large sizes. 36pt should be a good semi-neutral
211 * size.
212 *
213 * Since we always create CTFont at a fixed size, our CTFont lives in face_data
214 * instead of font_data. Which is good, because when people change scale on
215 * hb_font_t, we won't need to update our CTFont. */
216 data->ct_font = create_ct_font (data->cg_font, 36.);
217 if (unlikely (!data->ct_font))
218 {
219 DEBUG_MSG (CORETEXT, face, "CTFont creation failed.");
220 CFRelease (data->cg_font);
221 free (data);
222 return NULL;
223 }
224
225 return data;
226 }
227
228 void
229 _hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data)
230 {
231 CFRelease (data->ct_font);
232 CFRelease (data->cg_font);
233 free (data);
234 }
235
236 /*
237 * Since: 0.9.10
238 */
239 CGFontRef
240 hb_coretext_face_get_cg_font (hb_face_t *face)
241 {
242 if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return NULL;
243 hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
244 return face_data->cg_font;
245 }
246
247
248 /*
249 * shaper font data
250 */
251
252 struct hb_coretext_shaper_font_data_t {};
253
254 hb_coretext_shaper_font_data_t *
255 _hb_coretext_shaper_font_data_create (hb_font_t *font HB_UNUSED)
256 {
257 return (hb_coretext_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
258 }
259
260 void
261 _hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data)
262 {
263 }
264
265
266 /*
267 * shaper shape_plan data
268 */
269
270 struct hb_coretext_shaper_shape_plan_data_t {};
271
272 hb_coretext_shaper_shape_plan_data_t *
273 _hb_coretext_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
274 const hb_feature_t *user_features HB_UNUSED,
275 unsigned int num_user_features HB_UNUSED)
276 {
277 return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
278 }
279
280 void
281 _hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED)
282 {
283 }
284
285 CTFontRef
286 hb_coretext_font_get_ct_font (hb_font_t *font)
287 {
288 hb_face_t *face = font->face;
289 if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return NULL;
290 hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
291 return face_data->ct_font;
292 }
293
294
295 /*
296 * shaper
297 */
298
299 struct feature_record_t {
300 unsigned int feature;
301 unsigned int setting;
302 };
303
304 struct active_feature_t {
305 feature_record_t rec;
306 unsigned int order;
307
308 static int cmp (const active_feature_t *a, const active_feature_t *b) {
309 return a->rec.feature < b->rec.feature ? -1 : a->rec.feature > b->rec.feature ? 1 :
310 a->order < b->order ? -1 : a->order > b->order ? 1 :
311 a->rec.setting < b->rec.setting ? -1 : a->rec.setting > b->rec.setting ? 1 :
312 0;
313 }
314 bool operator== (const active_feature_t *f) {
315 return cmp (this, f) == 0;
316 }
317 };
318
319 struct feature_event_t {
320 unsigned int index;
321 bool start;
322 active_feature_t feature;
323
324 static int cmp (const feature_event_t *a, const feature_event_t *b) {
325 return a->index < b->index ? -1 : a->index > b->index ? 1 :
326 a->start < b->start ? -1 : a->start > b->start ? 1 :
327 active_feature_t::cmp (&a->feature, &b->feature);
328 }
329 };
330
331 struct range_record_t {
332 CTFontRef font;
333 unsigned int index_first; /* == start */
334 unsigned int index_last; /* == end - 1 */
335 };
336
337
338 /* The following enum members are added in OS X 10.8. */
339 #define kAltHalfWidthTextSelector 6
340 #define kAltProportionalTextSelector 5
341 #define kAlternateHorizKanaOffSelector 1
342 #define kAlternateHorizKanaOnSelector 0
343 #define kAlternateKanaType 34
344 #define kAlternateVertKanaOffSelector 3
345 #define kAlternateVertKanaOnSelector 2
346 #define kCaseSensitiveLayoutOffSelector 1
347 #define kCaseSensitiveLayoutOnSelector 0
348 #define kCaseSensitiveLayoutType 33
349 #define kCaseSensitiveSpacingOffSelector 3
350 #define kCaseSensitiveSpacingOnSelector 2
351 #define kContextualAlternatesOffSelector 1
352 #define kContextualAlternatesOnSelector 0
353 #define kContextualAlternatesType 36
354 #define kContextualLigaturesOffSelector 19
355 #define kContextualLigaturesOnSelector 18
356 #define kContextualSwashAlternatesOffSelector 5
357 #define kContextualSwashAlternatesOnSelector 4
358 #define kDefaultLowerCaseSelector 0
359 #define kDefaultUpperCaseSelector 0
360 #define kHistoricalLigaturesOffSelector 21
361 #define kHistoricalLigaturesOnSelector 20
362 #define kHojoCharactersSelector 12
363 #define kJIS2004CharactersSelector 11
364 #define kLowerCasePetiteCapsSelector 2
365 #define kLowerCaseSmallCapsSelector 1
366 #define kLowerCaseType 37
367 #define kMathematicalGreekOffSelector 11
368 #define kMathematicalGreekOnSelector 10
369 #define kNLCCharactersSelector 13
370 #define kQuarterWidthTextSelector 4
371 #define kScientificInferiorsSelector 4
372 #define kStylisticAltEightOffSelector 17
373 #define kStylisticAltEightOnSelector 16
374 #define kStylisticAltEighteenOffSelector 37
375 #define kStylisticAltEighteenOnSelector 36
376 #define kStylisticAltElevenOffSelector 23
377 #define kStylisticAltElevenOnSelector 22
378 #define kStylisticAltFifteenOffSelector 31
379 #define kStylisticAltFifteenOnSelector 30
380 #define kStylisticAltFiveOffSelector 11
381 #define kStylisticAltFiveOnSelector 10
382 #define kStylisticAltFourOffSelector 9
383 #define kStylisticAltFourOnSelector 8
384 #define kStylisticAltFourteenOffSelector 29
385 #define kStylisticAltFourteenOnSelector 28
386 #define kStylisticAltNineOffSelector 19
387 #define kStylisticAltNineOnSelector 18
388 #define kStylisticAltNineteenOffSelector 39
389 #define kStylisticAltNineteenOnSelector 38
390 #define kStylisticAltOneOffSelector 3
391 #define kStylisticAltOneOnSelector 2
392 #define kStylisticAltSevenOffSelector 15
393 #define kStylisticAltSevenOnSelector 14
394 #define kStylisticAltSeventeenOffSelector 35
395 #define kStylisticAltSeventeenOnSelector 34
396 #define kStylisticAltSixOffSelector 13
397 #define kStylisticAltSixOnSelector 12
398 #define kStylisticAltSixteenOffSelector 33
399 #define kStylisticAltSixteenOnSelector 32
400 #define kStylisticAltTenOffSelector 21
401 #define kStylisticAltTenOnSelector 20
402 #define kStylisticAltThirteenOffSelector 27
403 #define kStylisticAltThirteenOnSelector 26
404 #define kStylisticAltThreeOffSelector 7
405 #define kStylisticAltThreeOnSelector 6
406 #define kStylisticAltTwelveOffSelector 25
407 #define kStylisticAltTwelveOnSelector 24
408 #define kStylisticAltTwentyOffSelector 41
409 #define kStylisticAltTwentyOnSelector 40
410 #define kStylisticAltTwoOffSelector 5
411 #define kStylisticAltTwoOnSelector 4
412 #define kStylisticAlternativesType 35
413 #define kSwashAlternatesOffSelector 3
414 #define kSwashAlternatesOnSelector 2
415 #define kThirdWidthTextSelector 3
416 #define kTraditionalNamesCharactersSelector 14
417 #define kUpperCasePetiteCapsSelector 2
418 #define kUpperCaseSmallCapsSelector 1
419 #define kUpperCaseType 38
420
421 /* Table data courtesy of Apple. */
422 static const struct feature_mapping_t {
423 FourCharCode otFeatureTag;
424 uint16_t aatFeatureType;
425 uint16_t selectorToEnable;
426 uint16_t selectorToDisable;
427 } feature_mappings[] = {
428 { 'c2pc', kUpperCaseType, kUpperCasePetiteCapsSelector, kDefaultUpperCaseSelector },
429 { 'c2sc', kUpperCaseType, kUpperCaseSmallCapsSelector, kDefaultUpperCaseSelector },
430 { 'calt', kContextualAlternatesType, kContextualAlternatesOnSelector, kContextualAlternatesOffSelector },
431 { 'case', kCaseSensitiveLayoutType, kCaseSensitiveLayoutOnSelector, kCaseSensitiveLayoutOffSelector },
432 { 'clig', kLigaturesType, kContextualLigaturesOnSelector, kContextualLigaturesOffSelector },
433 { 'cpsp', kCaseSensitiveLayoutType, kCaseSensitiveSpacingOnSelector, kCaseSensitiveSpacingOffSelector },
434 { 'cswh', kContextualAlternatesType, kContextualSwashAlternatesOnSelector, kContextualSwashAlternatesOffSelector },
435 { 'dlig', kLigaturesType, kRareLigaturesOnSelector, kRareLigaturesOffSelector },
436 { 'expt', kCharacterShapeType, kExpertCharactersSelector, 16 },
437 { 'frac', kFractionsType, kDiagonalFractionsSelector, kNoFractionsSelector },
438 { 'fwid', kTextSpacingType, kMonospacedTextSelector, 7 },
439 { 'halt', kTextSpacingType, kAltHalfWidthTextSelector, 7 },
440 { 'hist', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector },
441 { 'hkna', kAlternateKanaType, kAlternateHorizKanaOnSelector, kAlternateHorizKanaOffSelector, },
442 { 'hlig', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector },
443 { 'hngl', kTransliterationType, kHanjaToHangulSelector, kNoTransliterationSelector },
444 { 'hojo', kCharacterShapeType, kHojoCharactersSelector, 16 },
445 { 'hwid', kTextSpacingType, kHalfWidthTextSelector, 7 },
446 { 'ital', kItalicCJKRomanType, kCJKItalicRomanOnSelector, kCJKItalicRomanOffSelector },
447 { 'jp04', kCharacterShapeType, kJIS2004CharactersSelector, 16 },
448 { 'jp78', kCharacterShapeType, kJIS1978CharactersSelector, 16 },
449 { 'jp83', kCharacterShapeType, kJIS1983CharactersSelector, 16 },
450 { 'jp90', kCharacterShapeType, kJIS1990CharactersSelector, 16 },
451 { 'liga', kLigaturesType, kCommonLigaturesOnSelector, kCommonLigaturesOffSelector },
452 { 'lnum', kNumberCaseType, kUpperCaseNumbersSelector, 2 },
453 { 'mgrk', kMathematicalExtrasType, kMathematicalGreekOnSelector, kMathematicalGreekOffSelector },
454 { 'nlck', kCharacterShapeType, kNLCCharactersSelector, 16 },
455 { 'onum', kNumberCaseType, kLowerCaseNumbersSelector, 2 },
456 { 'ordn', kVerticalPositionType, kOrdinalsSelector, kNormalPositionSelector },
457 { 'palt', kTextSpacingType, kAltProportionalTextSelector, 7 },
458 { 'pcap', kLowerCaseType, kLowerCasePetiteCapsSelector, kDefaultLowerCaseSelector },
459 { 'pkna', kTextSpacingType, kProportionalTextSelector, 7 },
460 { 'pnum', kNumberSpacingType, kProportionalNumbersSelector, 4 },
461 { 'pwid', kTextSpacingType, kProportionalTextSelector, 7 },
462 { 'qwid', kTextSpacingType, kQuarterWidthTextSelector, 7 },
463 { 'ruby', kRubyKanaType, kRubyKanaOnSelector, kRubyKanaOffSelector },
464 { 'sinf', kVerticalPositionType, kScientificInferiorsSelector, kNormalPositionSelector },
465 { 'smcp', kLowerCaseType, kLowerCaseSmallCapsSelector, kDefaultLowerCaseSelector },
466 { 'smpl', kCharacterShapeType, kSimplifiedCharactersSelector, 16 },
467 { 'ss01', kStylisticAlternativesType, kStylisticAltOneOnSelector, kStylisticAltOneOffSelector },
468 { 'ss02', kStylisticAlternativesType, kStylisticAltTwoOnSelector, kStylisticAltTwoOffSelector },
469 { 'ss03', kStylisticAlternativesType, kStylisticAltThreeOnSelector, kStylisticAltThreeOffSelector },
470 { 'ss04', kStylisticAlternativesType, kStylisticAltFourOnSelector, kStylisticAltFourOffSelector },
471 { 'ss05', kStylisticAlternativesType, kStylisticAltFiveOnSelector, kStylisticAltFiveOffSelector },
472 { 'ss06', kStylisticAlternativesType, kStylisticAltSixOnSelector, kStylisticAltSixOffSelector },
473 { 'ss07', kStylisticAlternativesType, kStylisticAltSevenOnSelector, kStylisticAltSevenOffSelector },
474 { 'ss08', kStylisticAlternativesType, kStylisticAltEightOnSelector, kStylisticAltEightOffSelector },
475 { 'ss09', kStylisticAlternativesType, kStylisticAltNineOnSelector, kStylisticAltNineOffSelector },
476 { 'ss10', kStylisticAlternativesType, kStylisticAltTenOnSelector, kStylisticAltTenOffSelector },
477 { 'ss11', kStylisticAlternativesType, kStylisticAltElevenOnSelector, kStylisticAltElevenOffSelector },
478 { 'ss12', kStylisticAlternativesType, kStylisticAltTwelveOnSelector, kStylisticAltTwelveOffSelector },
479 { 'ss13', kStylisticAlternativesType, kStylisticAltThirteenOnSelector, kStylisticAltThirteenOffSelector },
480 { 'ss14', kStylisticAlternativesType, kStylisticAltFourteenOnSelector, kStylisticAltFourteenOffSelector },
481 { 'ss15', kStylisticAlternativesType, kStylisticAltFifteenOnSelector, kStylisticAltFifteenOffSelector },
482 { 'ss16', kStylisticAlternativesType, kStylisticAltSixteenOnSelector, kStylisticAltSixteenOffSelector },
483 { 'ss17', kStylisticAlternativesType, kStylisticAltSeventeenOnSelector, kStylisticAltSeventeenOffSelector },
484 { 'ss18', kStylisticAlternativesType, kStylisticAltEighteenOnSelector, kStylisticAltEighteenOffSelector },
485 { 'ss19', kStylisticAlternativesType, kStylisticAltNineteenOnSelector, kStylisticAltNineteenOffSelector },
486 { 'ss20', kStylisticAlternativesType, kStylisticAltTwentyOnSelector, kStylisticAltTwentyOffSelector },
487 { 'subs', kVerticalPositionType, kInferiorsSelector, kNormalPositionSelector },
488 { 'sups', kVerticalPositionType, kSuperiorsSelector, kNormalPositionSelector },
489 { 'swsh', kContextualAlternatesType, kSwashAlternatesOnSelector, kSwashAlternatesOffSelector },
490 { 'titl', kStyleOptionsType, kTitlingCapsSelector, kNoStyleOptionsSelector },
491 { 'tnam', kCharacterShapeType, kTraditionalNamesCharactersSelector, 16 },
492 { 'tnum', kNumberSpacingType, kMonospacedNumbersSelector, 4 },
493 { 'trad', kCharacterShapeType, kTraditionalCharactersSelector, 16 },
494 { 'twid', kTextSpacingType, kThirdWidthTextSelector, 7 },
495 { 'unic', kLetterCaseType, 14, 15 },
496 { 'valt', kTextSpacingType, kAltProportionalTextSelector, 7 },
497 { 'vert', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector },
498 { 'vhal', kTextSpacingType, kAltHalfWidthTextSelector, 7 },
499 { 'vkna', kAlternateKanaType, kAlternateVertKanaOnSelector, kAlternateVertKanaOffSelector },
500 { 'vpal', kTextSpacingType, kAltProportionalTextSelector, 7 },
501 { 'vrt2', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector },
502 { 'zero', kTypographicExtrasType, kSlashedZeroOnSelector, kSlashedZeroOffSelector },
503 };
504
505 static int
506 _hb_feature_mapping_cmp (const void *key_, const void *entry_)
507 {
508 unsigned int key = * (unsigned int *) key_;
509 const feature_mapping_t * entry = (const feature_mapping_t *) entry_;
510 return key < entry->otFeatureTag ? -1 :
511 key > entry->otFeatureTag ? 1 :
512 0;
513 }
514
515 hb_bool_t
516 _hb_coretext_shape (hb_shape_plan_t *shape_plan,
517 hb_font_t *font,
518 hb_buffer_t *buffer,
519 const hb_feature_t *features,
520 unsigned int num_features)
521 {
522 hb_face_t *face = font->face;
523 hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
524
525 CGFloat ct_font_size = CTFontGetSize (face_data->ct_font);
526 CGFloat x_mult = (CGFloat) font->x_scale / ct_font_size;
527 CGFloat y_mult = (CGFloat) font->y_scale / ct_font_size;
528
529 /* Attach marks to their bases, to match the 'ot' shaper.
530 * Adapted from hb-ot-shape:hb_form_clusters().
531 * Note that this only makes us be closer to the 'ot' shaper,
532 * but by no means the same. For example, if there's
533 * B1 M1 B2 M2, and B1-B2 form a ligature, M2's cluster will
534 * continue pointing to B2 even though B2 was merged into B1's
535 * cluster... */
536 if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES)
537 {
538 hb_unicode_funcs_t *unicode = buffer->unicode;
539 unsigned int count = buffer->len;
540 hb_glyph_info_t *info = buffer->info;
541 for (unsigned int i = 1; i < count; i++)
542 if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (unicode->general_category (info[i].codepoint)))
543 buffer->merge_clusters (i - 1, i + 1);
544 }
545
546 hb_auto_array_t<feature_record_t> feature_records;
547 hb_auto_array_t<range_record_t> range_records;
548
549 /*
550 * Set up features.
551 * (copied + modified from code from hb-uniscribe.cc)
552 */
553 if (num_features)
554 {
555 /* Sort features by start/end events. */
556 hb_auto_array_t<feature_event_t> feature_events;
557 for (unsigned int i = 0; i < num_features; i++)
558 {
559 const feature_mapping_t * mapping = (const feature_mapping_t *) bsearch (&features[i].tag,
560 feature_mappings,
561 ARRAY_LENGTH (feature_mappings),
562 sizeof (feature_mappings[0]),
563 _hb_feature_mapping_cmp);
564 if (!mapping)
565 continue;
566
567 active_feature_t feature;
568 feature.rec.feature = mapping->aatFeatureType;
569 feature.rec.setting = features[i].value ? mapping->selectorToEnable : mapping->selectorToDisable;
570 feature.order = i;
571
572 feature_event_t *event;
573
574 event = feature_events.push ();
575 if (unlikely (!event))
576 goto fail_features;
577 event->index = features[i].start;
578 event->start = true;
579 event->feature = feature;
580
581 event = feature_events.push ();
582 if (unlikely (!event))
583 goto fail_features;
584 event->index = features[i].end;
585 event->start = false;
586 event->feature = feature;
587 }
588 feature_events.qsort ();
589 /* Add a strategic final event. */
590 {
591 active_feature_t feature;
592 feature.rec.feature = HB_TAG_NONE;
593 feature.rec.setting = 0;
594 feature.order = num_features + 1;
595
596 feature_event_t *event = feature_events.push ();
597 if (unlikely (!event))
598 goto fail_features;
599 event->index = 0; /* This value does magic. */
600 event->start = false;
601 event->feature = feature;
602 }
603
604 /* Scan events and save features for each range. */
605 hb_auto_array_t<active_feature_t> active_features;
606 unsigned int last_index = 0;
607 for (unsigned int i = 0; i < feature_events.len; i++)
608 {
609 feature_event_t *event = &feature_events[i];
610
611 if (event->index != last_index)
612 {
613 /* Save a snapshot of active features and the range. */
614 range_record_t *range = range_records.push ();
615 if (unlikely (!range))
616 goto fail_features;
617
618 if (active_features.len)
619 {
620 CFMutableArrayRef features_array = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
621
622 /* TODO sort and resolve conflicting features? */
623 /* active_features.qsort (); */
624 for (unsigned int j = 0; j < active_features.len; j++)
625 {
626 CFStringRef keys[2] = {
627 kCTFontFeatureTypeIdentifierKey,
628 kCTFontFeatureSelectorIdentifierKey
629 };
630 CFNumberRef values[2] = {
631 CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.feature),
632 CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting)
633 };
634 CFDictionaryRef dict = CFDictionaryCreate (kCFAllocatorDefault,
635 (const void **) keys,
636 (const void **) values,
637 2,
638 &kCFTypeDictionaryKeyCallBacks,
639 &kCFTypeDictionaryValueCallBacks);
640 CFRelease (values[0]);
641 CFRelease (values[1]);
642
643 CFArrayAppendValue (features_array, dict);
644 CFRelease (dict);
645
646 }
647
648 CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,
649 (const void **) &kCTFontFeatureSettingsAttribute,
650 (const void **) &features_array,
651 1,
652 &kCFTypeDictionaryKeyCallBacks,
653 &kCFTypeDictionaryValueCallBacks);
654 CFRelease (features_array);
655
656 CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);
657 CFRelease (attributes);
658
659 range->font = CTFontCreateCopyWithAttributes (face_data->ct_font, 0.0, NULL, font_desc);
660 CFRelease (font_desc);
661 }
662 else
663 {
664 range->font = NULL;
665 }
666
667 range->index_first = last_index;
668 range->index_last = event->index - 1;
669
670 last_index = event->index;
671 }
672
673 if (event->start) {
674 active_feature_t *feature = active_features.push ();
675 if (unlikely (!feature))
676 goto fail_features;
677 *feature = event->feature;
678 } else {
679 active_feature_t *feature = active_features.find (&event->feature);
680 if (feature)
681 active_features.remove (feature - active_features.array);
682 }
683 }
684
685 if (!range_records.len) /* No active feature found. */
686 goto fail_features;
687 }
688 else
689 {
690 fail_features:
691 num_features = 0;
692 }
693
694 unsigned int scratch_size;
695 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
696
697 #define ALLOCATE_ARRAY(Type, name, len, on_no_room) \
698 Type *name = (Type *) scratch; \
699 { \
700 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
701 if (unlikely (_consumed > scratch_size)) \
702 { \
703 on_no_room; \
704 assert (0); \
705 } \
706 scratch += _consumed; \
707 scratch_size -= _consumed; \
708 }
709
710 ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2, /*nothing*/);
711 unsigned int chars_len = 0;
712 for (unsigned int i = 0; i < buffer->len; i++) {
713 hb_codepoint_t c = buffer->info[i].codepoint;
714 if (likely (c <= 0xFFFFu))
715 pchars[chars_len++] = c;
716 else if (unlikely (c > 0x10FFFFu))
717 pchars[chars_len++] = 0xFFFDu;
718 else {
719 pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10);
720 pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1 << 10) - 1));
721 }
722 }
723
724 ALLOCATE_ARRAY (unsigned int, log_clusters, chars_len, /*nothing*/);
725 chars_len = 0;
726 for (unsigned int i = 0; i < buffer->len; i++)
727 {
728 hb_codepoint_t c = buffer->info[i].codepoint;
729 unsigned int cluster = buffer->info[i].cluster;
730 log_clusters[chars_len++] = cluster;
731 if (hb_in_range (c, 0x10000u, 0x10FFFFu))
732 log_clusters[chars_len++] = cluster; /* Surrogates. */
733 }
734
735 #define FAIL(...) \
736 HB_STMT_START { \
737 DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \
738 ret = false; \
739 goto fail; \
740 } HB_STMT_END;
741
742 bool ret = true;
743 CFStringRef string_ref = NULL;
744 CTLineRef line = NULL;
745
746 if (0)
747 {
748 resize_and_retry:
749 DEBUG_MSG (CORETEXT, buffer, "Buffer resize");
750 /* string_ref uses the scratch-buffer for backing store, and line references
751 * string_ref (via attr_string). We must release those before resizing buffer. */
752 assert (string_ref);
753 assert (line);
754 CFRelease (string_ref);
755 CFRelease (line);
756 string_ref = NULL;
757 line = NULL;
758
759 /* Get previous start-of-scratch-area, that we use later for readjusting
760 * our existing scratch arrays. */
761 unsigned int old_scratch_used;
762 hb_buffer_t::scratch_buffer_t *old_scratch;
763 old_scratch = buffer->get_scratch_buffer (&old_scratch_used);
764 old_scratch_used = scratch - old_scratch;
765
766 if (unlikely (!buffer->ensure (buffer->allocated * 2)))
767 FAIL ("Buffer resize failed");
768
769 /* Adjust scratch, pchars, and log_cluster arrays. This is ugly, but really the
770 * cleanest way to do without completely restructuring the rest of this shaper. */
771 scratch = buffer->get_scratch_buffer (&scratch_size);
772 pchars = reinterpret_cast<UniChar *> (((char *) scratch + ((char *) pchars - (char *) old_scratch)));
773 log_clusters = reinterpret_cast<unsigned int *> (((char *) scratch + ((char *) log_clusters - (char *) old_scratch)));
774 scratch += old_scratch_used;
775 scratch_size -= old_scratch_used;
776 }
777 {
778 string_ref = CFStringCreateWithCharactersNoCopy (NULL,
779 pchars, chars_len,
780 kCFAllocatorNull);
781 if (unlikely (!string_ref))
782 FAIL ("CFStringCreateWithCharactersNoCopy failed");
783
784 /* Create an attributed string, populate it, and create a line from it, then release attributed string. */
785 {
786 CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (kCFAllocatorDefault,
787 chars_len);
788 if (unlikely (!attr_string))
789 FAIL ("CFAttributedStringCreateMutable failed");
790 CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref);
791 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
792 {
793 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
794 kCTVerticalFormsAttributeName, kCFBooleanTrue);
795 }
796
797 if (buffer->props.language)
798 {
799 /* What's the iOS equivalent of this check?
800 * The symbols was introduced in iOS 7.0.
801 * At any rate, our fallback is safe and works fine. */
802 #if MAC_OS_X_VERSION_MIN_REQUIRED < 1090
803 # define kCTLanguageAttributeName CFSTR ("NSLanguage")
804 #endif
805 CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault,
806 hb_language_to_string (buffer->props.language),
807 kCFStringEncodingUTF8,
808 kCFAllocatorNull);
809 if (unlikely (!lang))
810 FAIL ("CFStringCreateWithCStringNoCopy failed");
811 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
812 kCTLanguageAttributeName, lang);
813 CFRelease (lang);
814 }
815 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
816 kCTFontAttributeName, face_data->ct_font);
817
818 if (num_features)
819 {
820 unsigned int start = 0;
821 range_record_t *last_range = &range_records[0];
822 for (unsigned int k = 0; k < chars_len; k++)
823 {
824 range_record_t *range = last_range;
825 while (log_clusters[k] < range->index_first)
826 range--;
827 while (log_clusters[k] > range->index_last)
828 range++;
829 if (range != last_range)
830 {
831 if (last_range->font)
832 CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, k - start),
833 kCTFontAttributeName, last_range->font);
834
835 start = k;
836 }
837
838 last_range = range;
839 }
840 if (start != chars_len && last_range->font)
841 CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, chars_len - start),
842 kCTFontAttributeName, last_range->font);
843 }
844
845 int level = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;
846 CFNumberRef level_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &level);
847 CFDictionaryRef options = CFDictionaryCreate (kCFAllocatorDefault,
848 (const void **) &kCTTypesetterOptionForcedEmbeddingLevel,
849 (const void **) &level_number,
850 1,
851 &kCFTypeDictionaryKeyCallBacks,
852 &kCFTypeDictionaryValueCallBacks);
853 if (unlikely (!options))
854 FAIL ("CFDictionaryCreate failed");
855
856 CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions (attr_string, options);
857 CFRelease (options);
858 CFRelease (attr_string);
859 if (unlikely (!typesetter))
860 FAIL ("CTTypesetterCreateWithAttributedStringAndOptions failed");
861
862 line = CTTypesetterCreateLine (typesetter, CFRangeMake(0, 0));
863 CFRelease (typesetter);
864 if (unlikely (!line))
865 FAIL ("CTTypesetterCreateLine failed");
866 }
867
868 CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
869 unsigned int num_runs = CFArrayGetCount (glyph_runs);
870 DEBUG_MSG (CORETEXT, NULL, "Num runs: %d", num_runs);
871
872 buffer->len = 0;
873 uint32_t status_and = ~0, status_or = 0;
874 double advances_so_far = 0;
875 /* For right-to-left runs, CoreText returns the glyphs positioned such that
876 * any trailing whitespace is to the left of (0,0). Adjust coordinate system
877 * to fix for that. Test with any RTL string with trailing spaces.
878 * https://code.google.com/p/chromium/issues/detail?id=469028
879 */
880 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
881 {
882 advances_so_far -= CTLineGetTrailingWhitespaceWidth (line);
883 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
884 advances_so_far = -advances_so_far;
885 }
886
887 const CFRange range_all = CFRangeMake (0, 0);
888
889 for (unsigned int i = 0; i < num_runs; i++)
890 {
891 CTRunRef run = static_cast<CTRunRef>(CFArrayGetValueAtIndex (glyph_runs, i));
892 CTRunStatus run_status = CTRunGetStatus (run);
893 status_or |= run_status;
894 status_and &= run_status;
895 DEBUG_MSG (CORETEXT, run, "CTRunStatus: %x", run_status);
896 double run_advance = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL);
897 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
898 run_advance = -run_advance;
899 DEBUG_MSG (CORETEXT, run, "Run advance: %g", run_advance);
900
901 /* CoreText does automatic font fallback (AKA "cascading") for characters
902 * not supported by the requested font, and provides no way to turn it off,
903 * so we must detect if the returned run uses a font other than the requested
904 * one and fill in the buffer with .notdef glyphs instead of random glyph
905 * indices from a different font.
906 */
907 CFDictionaryRef attributes = CTRunGetAttributes (run);
908 CTFontRef run_ct_font = static_cast<CTFontRef>(CFDictionaryGetValue (attributes, kCTFontAttributeName));
909 if (!CFEqual (run_ct_font, face_data->ct_font))
910 {
911 /* The run doesn't use our main font instance. We have to figure out
912 * whether font fallback happened, or this is just CoreText giving us
913 * another CTFont using the same underlying CGFont. CoreText seems
914 * to do that in a variety of situations, one of which being vertical
915 * text, but also perhaps for caching reasons.
916 *
917 * First, see if it uses any of our subfonts created to set font features...
918 *
919 * Next, compare the CGFont to the one we used to create our fonts.
920 * Even this doesn't work all the time.
921 *
922 * Finally, we compare PS names, which I don't think are unique...
923 *
924 * Looks like if we really want to be sure here we have to modify the
925 * font to change the name table, similar to what we do in the uniscribe
926 * backend.
927 *
928 * However, even that wouldn't work if we were passed in the CGFont to
929 * construct a hb_face to begin with.
930 *
931 * See: http://github.com/behdad/harfbuzz/pull/36
932 *
933 * Also see: https://bugs.chromium.org/p/chromium/issues/detail?id=597098
934 */
935 bool matched = false;
936 for (unsigned int i = 0; i < range_records.len; i++)
937 if (range_records[i].font && CFEqual (run_ct_font, range_records[i].font))
938 {
939 matched = true;
940 break;
941 }
942 if (!matched)
943 {
944 CGFontRef run_cg_font = CTFontCopyGraphicsFont (run_ct_font, 0);
945 if (run_cg_font)
946 {
947 matched = CFEqual (run_cg_font, face_data->cg_font);
948 CFRelease (run_cg_font);
949 }
950 }
951 if (!matched)
952 {
953 CFStringRef font_ps_name = CTFontCopyName (face_data->ct_font, kCTFontPostScriptNameKey);
954 CFStringRef run_ps_name = CTFontCopyName (run_ct_font, kCTFontPostScriptNameKey);
955 CFComparisonResult result = CFStringCompare (run_ps_name, font_ps_name, 0);
956 CFRelease (run_ps_name);
957 CFRelease (font_ps_name);
958 if (result == kCFCompareEqualTo)
959 matched = true;
960 }
961 if (!matched)
962 {
963 CFRange range = CTRunGetStringRange (run);
964 DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld",
965 range.location, range.location + range.length);
966 if (!buffer->ensure_inplace (buffer->len + range.length))
967 goto resize_and_retry;
968 hb_glyph_info_t *info = buffer->info + buffer->len;
969
970 hb_codepoint_t notdef = 0;
971 hb_direction_t dir = buffer->props.direction;
972 hb_position_t x_advance, y_advance, x_offset, y_offset;
973 hb_font_get_glyph_advance_for_direction (font, notdef, dir, &x_advance, &y_advance);
974 hb_font_get_glyph_origin_for_direction (font, notdef, dir, &x_offset, &y_offset);
975 hb_position_t advance = x_advance + y_advance;
976 x_offset = -x_offset;
977 y_offset = -y_offset;
978
979 unsigned int old_len = buffer->len;
980 for (CFIndex j = range.location; j < range.location + range.length; j++)
981 {
982 UniChar ch = CFStringGetCharacterAtIndex (string_ref, j);
983 if (hb_in_range<UniChar> (ch, 0xDC00u, 0xDFFFu) && range.location < j)
984 {
985 ch = CFStringGetCharacterAtIndex (string_ref, j - 1);
986 if (hb_in_range<UniChar> (ch, 0xD800u, 0xDBFFu))
987 /* This is the second of a surrogate pair. Don't need .notdef
988 * for this one. */
989 continue;
990 }
991 if (buffer->unicode->is_default_ignorable (ch))
992 continue;
993
994 info->codepoint = notdef;
995 info->cluster = log_clusters[j];
996
997 info->mask = advance;
998 info->var1.i32 = x_offset;
999 info->var2.i32 = y_offset;
1000
1001 info++;
1002 buffer->len++;
1003 }
1004 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
1005 buffer->reverse_range (old_len, buffer->len);
1006 advances_so_far += run_advance;
1007 continue;
1008 }
1009 }
1010
1011 unsigned int num_glyphs = CTRunGetGlyphCount (run);
1012 if (num_glyphs == 0)
1013 continue;
1014
1015 if (!buffer->ensure_inplace (buffer->len + num_glyphs))
1016 goto resize_and_retry;
1017
1018 hb_glyph_info_t *run_info = buffer->info + buffer->len;
1019
1020 /* Testing used to indicate that CTRunGetGlyphsPtr, etc (almost?) always
1021 * succeed, and so copying data to our own buffer will be rare. Reports
1022 * have it that this changed in OS X 10.10 Yosemite, and NULL is returned
1023 * frequently. At any rate, we can test that codepath by setting USE_PTR
1024 * to false. */
1025
1026 #define USE_PTR true
1027
1028 #define SCRATCH_SAVE() \
1029 unsigned int scratch_size_saved = scratch_size; \
1030 hb_buffer_t::scratch_buffer_t *scratch_saved = scratch
1031
1032 #define SCRATCH_RESTORE() \
1033 scratch_size = scratch_size_saved; \
1034 scratch = scratch_saved;
1035
1036 { /* Setup glyphs */
1037 SCRATCH_SAVE();
1038 const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : NULL;
1039 if (!glyphs) {
1040 ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry);
1041 CTRunGetGlyphs (run, range_all, glyph_buf);
1042 glyphs = glyph_buf;
1043 }
1044 const CFIndex* string_indices = USE_PTR ? CTRunGetStringIndicesPtr (run) : NULL;
1045 if (!string_indices) {
1046 ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs, goto resize_and_retry);
1047 CTRunGetStringIndices (run, range_all, index_buf);
1048 string_indices = index_buf;
1049 }
1050 hb_glyph_info_t *info = run_info;
1051 for (unsigned int j = 0; j < num_glyphs; j++)
1052 {
1053 info->codepoint = glyphs[j];
1054 info->cluster = log_clusters[string_indices[j]];
1055 info++;
1056 }
1057 SCRATCH_RESTORE();
1058 }
1059 {
1060 /* Setup positions.
1061 * Note that CoreText does not return advances for glyphs. As such,
1062 * for all but last glyph, we use the delta position to next glyph as
1063 * advance (in the advance direction only), and for last glyph we set
1064 * whatever is needed to make the whole run's advance add up. */
1065 SCRATCH_SAVE();
1066 const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : NULL;
1067 if (!positions) {
1068 ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry);
1069 CTRunGetPositions (run, range_all, position_buf);
1070 positions = position_buf;
1071 }
1072 hb_glyph_info_t *info = run_info;
1073 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
1074 {
1075 hb_position_t x_offset = (positions[0].x - advances_so_far) * x_mult;
1076 for (unsigned int j = 0; j < num_glyphs; j++)
1077 {
1078 double advance;
1079 if (likely (j + 1 < num_glyphs))
1080 advance = positions[j + 1].x - positions[j].x;
1081 else /* last glyph */
1082 advance = run_advance - (positions[j].x - positions[0].x);
1083 info->mask = advance * x_mult;
1084 info->var1.i32 = x_offset;
1085 info->var2.i32 = positions[j].y * y_mult;
1086 info++;
1087 }
1088 }
1089 else
1090 {
1091 hb_position_t y_offset = (positions[0].y - advances_so_far) * y_mult;
1092 for (unsigned int j = 0; j < num_glyphs; j++)
1093 {
1094 double advance;
1095 if (likely (j + 1 < num_glyphs))
1096 advance = positions[j + 1].y - positions[j].y;
1097 else /* last glyph */
1098 advance = run_advance - (positions[j].y - positions[0].y);
1099 info->mask = advance * y_mult;
1100 info->var1.i32 = positions[j].x * x_mult;
1101 info->var2.i32 = y_offset;
1102 info++;
1103 }
1104 }
1105 SCRATCH_RESTORE();
1106 advances_so_far += run_advance;
1107 }
1108 #undef SCRATCH_RESTORE
1109 #undef SCRATCH_SAVE
1110 #undef USE_PTR
1111 #undef ALLOCATE_ARRAY
1112
1113 buffer->len += num_glyphs;
1114 }
1115
1116 /* Mac OS 10.6 doesn't have kCTTypesetterOptionForcedEmbeddingLevel,
1117 * or if it does, it doesn't resepct it. So we get runs with wrong
1118 * directions. As such, disable the assert... It wouldn't crash, but
1119 * cursoring will be off...
1120 *
1121 * http://crbug.com/419769
1122 */
1123 if (0)
1124 {
1125 /* Make sure all runs had the expected direction. */
1126 bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
1127 assert (bool (status_and & kCTRunStatusRightToLeft) == backward);
1128 assert (bool (status_or & kCTRunStatusRightToLeft) == backward);
1129 }
1130
1131 buffer->clear_positions ();
1132
1133 unsigned int count = buffer->len;
1134 hb_glyph_info_t *info = buffer->info;
1135 hb_glyph_position_t *pos = buffer->pos;
1136 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
1137 for (unsigned int i = 0; i < count; i++)
1138 {
1139 pos->x_advance = info->mask;
1140 pos->x_offset = info->var1.i32;
1141 pos->y_offset = info->var2.i32;
1142 info++, pos++;
1143 }
1144 else
1145 for (unsigned int i = 0; i < count; i++)
1146 {
1147 pos->y_advance = info->mask;
1148 pos->x_offset = info->var1.i32;
1149 pos->y_offset = info->var2.i32;
1150 info++, pos++;
1151 }
1152
1153 /* Fix up clusters so that we never return out-of-order indices;
1154 * if core text has reordered glyphs, we'll merge them to the
1155 * beginning of the reordered cluster. CoreText is nice enough
1156 * to tell us whenever it has produced nonmonotonic results...
1157 * Note that we assume the input clusters were nonmonotonic to
1158 * begin with.
1159 *
1160 * This does *not* mean we'll form the same clusters as Uniscribe
1161 * or the native OT backend, only that the cluster indices will be
1162 * monotonic in the output buffer. */
1163 if (count > 1 && (status_or & kCTRunStatusNonMonotonic))
1164 {
1165 hb_glyph_info_t *info = buffer->info;
1166 if (HB_DIRECTION_IS_FORWARD (buffer->props.direction))
1167 {
1168 unsigned int cluster = info[count - 1].cluster;
1169 for (unsigned int i = count - 1; i > 0; i--)
1170 {
1171 cluster = MIN (cluster, info[i - 1].cluster);
1172 info[i - 1].cluster = cluster;
1173 }
1174 }
1175 else
1176 {
1177 unsigned int cluster = info[0].cluster;
1178 for (unsigned int i = 1; i < count; i++)
1179 {
1180 cluster = MIN (cluster, info[i].cluster);
1181 info[i].cluster = cluster;
1182 }
1183 }
1184 }
1185 }
1186
1187 #undef FAIL
1188
1189 fail:
1190 if (string_ref)
1191 CFRelease (string_ref);
1192 if (line)
1193 CFRelease (line);
1194
1195 for (unsigned int i = 0; i < range_records.len; i++)
1196 if (range_records[i].font)
1197 CFRelease (range_records[i].font);
1198
1199 return ret;
1200 }
1201
1202
1203 /*
1204 * AAT shaper
1205 */
1206
1207 /*
1208 * shaper face data
1209 */
1210
1211 struct hb_coretext_aat_shaper_face_data_t {};
1212
1213 hb_coretext_aat_shaper_face_data_t *
1214 _hb_coretext_aat_shaper_face_data_create (hb_face_t *face)
1215 {
1216 hb_blob_t *mort_blob = face->reference_table (HB_CORETEXT_TAG_MORT);
1217 /* Umm, we just reference the table to check whether it exists.
1218 * Maybe add better API for this? */
1219 if (!hb_blob_get_length (mort_blob))
1220 {
1221 hb_blob_destroy (mort_blob);
1222 mort_blob = face->reference_table (HB_CORETEXT_TAG_MORX);
1223 if (!hb_blob_get_length (mort_blob))
1224 {
1225 hb_blob_destroy (mort_blob);
1226 return NULL;
1227 }
1228 }
1229 hb_blob_destroy (mort_blob);
1230
1231 return hb_coretext_shaper_face_data_ensure (face) ? (hb_coretext_aat_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED : NULL;
1232 }
1233
1234 void
1235 _hb_coretext_aat_shaper_face_data_destroy (hb_coretext_aat_shaper_face_data_t *data HB_UNUSED)
1236 {
1237 }
1238
1239
1240 /*
1241 * shaper font data
1242 */
1243
1244 struct hb_coretext_aat_shaper_font_data_t {};
1245
1246 hb_coretext_aat_shaper_font_data_t *
1247 _hb_coretext_aat_shaper_font_data_create (hb_font_t *font)
1248 {
1249 return hb_coretext_shaper_font_data_ensure (font) ? (hb_coretext_aat_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED : NULL;
1250 }
1251
1252 void
1253 _hb_coretext_aat_shaper_font_data_destroy (hb_coretext_aat_shaper_font_data_t *data HB_UNUSED)
1254 {
1255 }
1256
1257
1258 /*
1259 * shaper shape_plan data
1260 */
1261
1262 struct hb_coretext_aat_shaper_shape_plan_data_t {};
1263
1264 hb_coretext_aat_shaper_shape_plan_data_t *
1265 _hb_coretext_aat_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
1266 const hb_feature_t *user_features HB_UNUSED,
1267 unsigned int num_user_features HB_UNUSED)
1268 {
1269 return (hb_coretext_aat_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
1270 }
1271
1272 void
1273 _hb_coretext_aat_shaper_shape_plan_data_destroy (hb_coretext_aat_shaper_shape_plan_data_t *data HB_UNUSED)
1274 {
1275 }
1276
1277
1278 /*
1279 * shaper
1280 */
1281
1282 hb_bool_t
1283 _hb_coretext_aat_shape (hb_shape_plan_t *shape_plan,
1284 hb_font_t *font,
1285 hb_buffer_t *buffer,
1286 const hb_feature_t *features,
1287 unsigned int num_features)
1288 {
1289 return _hb_coretext_shape (shape_plan, font, buffer, features, num_features);
1290 }