1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 // This file is available under and governed by the GNU General Public
26 // License version 2 only, as published by the Free Software Foundation.
27 // However, the following notice accompanied the original version of this
28 // file:
29 //
30 /*
31 * Copyright © 2012,2013 Mozilla Foundation.
32 * Copyright © 2012,2013 Google, Inc.
33 *
34 * This is part of HarfBuzz, a text shaping library.
35 *
36 * Permission is hereby granted, without written agreement and without
37 * license or royalty fees, to use, copy, modify, and distribute this
38 * software and its documentation for any purpose, provided that the
39 * above copyright notice and the following two paragraphs appear in
40 * all copies of this software.
41 *
42 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
43 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
44 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
45 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
46 * DAMAGE.
47 *
48 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
49 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
50 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
51 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
52 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
53 *
54 * Mozilla Author(s): Jonathan Kew
55 * Google Author(s): Behdad Esfahbod
56 */
57
58 #define HB_SHAPER coretext
59 #define hb_coretext_shaper_face_data_t CGFont
60 #include "hb-shaper-impl-private.hh"
61
62 #include "hb-coretext.h"
63
64
65 #ifndef HB_DEBUG_CORETEXT
66 #define HB_DEBUG_CORETEXT (HB_DEBUG+0)
67 #endif
68
69
70 static void
71 release_table_data (void *user_data)
72 {
73 CFDataRef cf_data = reinterpret_cast<CFDataRef> (user_data);
74 CFRelease(cf_data);
75 }
76
77 static hb_blob_t *
78 reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
79 {
80 CGFontRef cg_font = reinterpret_cast<CGFontRef> (user_data);
81 CFDataRef cf_data = CGFontCopyTableForTag (cg_font, tag);
82 if (unlikely (!cf_data))
83 return NULL;
84
85 const char *data = reinterpret_cast<const char*> (CFDataGetBytePtr (cf_data));
86 const size_t length = CFDataGetLength (cf_data);
87 if (!data || !length)
88 return NULL;
89
90 return hb_blob_create (data, length, HB_MEMORY_MODE_READONLY,
91 reinterpret_cast<void *> (const_cast<__CFData *> (cf_data)),
92 release_table_data);
93 }
94
95 hb_face_t *
96 hb_coretext_face_create (CGFontRef cg_font)
97 {
98 return hb_face_create_for_tables (reference_table, CGFontRetain (cg_font), (hb_destroy_func_t) CGFontRelease);
99 }
100
101
102 HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face)
103 HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font)
104
105
106 /*
107 * shaper face data
108 */
109
110 static void
111 release_data (void *info, const void *data, size_t size)
112 {
113 assert (hb_blob_get_length ((hb_blob_t *) info) == size &&
114 hb_blob_get_data ((hb_blob_t *) info, NULL) == data);
115
116 hb_blob_destroy ((hb_blob_t *) info);
117 }
118
119 hb_coretext_shaper_face_data_t *
120 _hb_coretext_shaper_face_data_create (hb_face_t *face)
121 {
122 hb_coretext_shaper_face_data_t *data = NULL;
123
124 if (face->destroy == (hb_destroy_func_t) CGFontRelease)
125 {
126 data = CGFontRetain ((CGFontRef) face->user_data);
127 }
128 else
129 {
130 hb_blob_t *blob = hb_face_reference_blob (face);
131 unsigned int blob_length;
132 const char *blob_data = hb_blob_get_data (blob, &blob_length);
133 if (unlikely (!blob_length))
134 DEBUG_MSG (CORETEXT, face, "Face has empty blob");
135
136 CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data);
137 if (likely (provider))
138 {
139 data = CGFontCreateWithDataProvider (provider);
140 CGDataProviderRelease (provider);
141 }
142 }
143
144 if (unlikely (!data)) {
145 DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
146 }
147
148 return data;
149 }
150
151 void
152 _hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data)
153 {
154 CFRelease (data);
155 }
156
157 /*
158 * Since: 0.9.10
159 */
160 CGFontRef
161 hb_coretext_face_get_cg_font (hb_face_t *face)
162 {
163 if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return NULL;
164 hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
165 return face_data;
166 }
167
168
169 /*
170 * shaper font data
171 */
172
173 struct hb_coretext_shaper_font_data_t {
174 CTFontRef ct_font;
175 CGFloat x_mult, y_mult; /* From CT space to HB space. */
176 };
177
178 hb_coretext_shaper_font_data_t *
179 _hb_coretext_shaper_font_data_create (hb_font_t *font)
180 {
181 if (unlikely (!hb_coretext_shaper_face_data_ensure (font->face))) return NULL;
182
183 hb_coretext_shaper_font_data_t *data = (hb_coretext_shaper_font_data_t *) calloc (1, sizeof (hb_coretext_shaper_font_data_t));
184 if (unlikely (!data))
185 return NULL;
186
187 hb_face_t *face = font->face;
188 hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
189
190 /* Choose a CoreText font size and calculate multipliers to convert to HarfBuzz space. */
191 /* TODO: use upem instead of 36? */
192 CGFloat font_size = 36.; /* Default... */
193 /* No idea if the following is even a good idea. */
194 if (font->y_ppem)
195 font_size = font->y_ppem;
196
197 if (font_size < 0)
198 font_size = -font_size;
199 data->x_mult = (CGFloat) font->x_scale / font_size;
200 data->y_mult = (CGFloat) font->y_scale / font_size;
201 data->ct_font = CTFontCreateWithGraphicsFont (face_data, font_size, NULL, NULL);
202 if (unlikely (!data->ct_font)) {
203 DEBUG_MSG (CORETEXT, font, "Font CTFontCreateWithGraphicsFont() failed");
204 free (data);
205 return NULL;
206 }
207
208 return data;
209 }
210
211 void
212 _hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data)
213 {
214 CFRelease (data->ct_font);
215 free (data);
216 }
217
218
219 /*
220 * shaper shape_plan data
221 */
222
223 struct hb_coretext_shaper_shape_plan_data_t {};
224
225 hb_coretext_shaper_shape_plan_data_t *
226 _hb_coretext_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
227 const hb_feature_t *user_features HB_UNUSED,
228 unsigned int num_user_features HB_UNUSED)
229 {
230 return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
231 }
232
233 void
234 _hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED)
235 {
236 }
237
238 CTFontRef
239 hb_coretext_font_get_ct_font (hb_font_t *font)
240 {
241 if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return NULL;
242 hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
243 return font_data->ct_font;
244 }
245
246
247 /*
248 * shaper
249 */
250
251 struct feature_record_t {
252 unsigned int feature;
253 unsigned int setting;
254 };
255
256 struct active_feature_t {
257 feature_record_t rec;
258 unsigned int order;
259
260 static int cmp (const active_feature_t *a, const active_feature_t *b) {
261 return a->rec.feature < b->rec.feature ? -1 : a->rec.feature > b->rec.feature ? 1 :
262 a->order < b->order ? -1 : a->order > b->order ? 1 :
263 a->rec.setting < b->rec.setting ? -1 : a->rec.setting > b->rec.setting ? 1 :
264 0;
265 }
266 bool operator== (const active_feature_t *f) {
267 return cmp (this, f) == 0;
268 }
269 };
270
271 struct feature_event_t {
272 unsigned int index;
273 bool start;
274 active_feature_t feature;
275
276 static int cmp (const feature_event_t *a, const feature_event_t *b) {
277 return a->index < b->index ? -1 : a->index > b->index ? 1 :
278 a->start < b->start ? -1 : a->start > b->start ? 1 :
279 active_feature_t::cmp (&a->feature, &b->feature);
280 }
281 };
282
283 struct range_record_t {
284 CTFontRef font;
285 unsigned int index_first; /* == start */
286 unsigned int index_last; /* == end - 1 */
287 };
288
289
290 /* The following enum members are added in OS X 10.8. */
291 #define kAltHalfWidthTextSelector 6
292 #define kAltProportionalTextSelector 5
293 #define kAlternateHorizKanaOffSelector 1
294 #define kAlternateHorizKanaOnSelector 0
295 #define kAlternateKanaType 34
296 #define kAlternateVertKanaOffSelector 3
297 #define kAlternateVertKanaOnSelector 2
298 #define kCaseSensitiveLayoutOffSelector 1
299 #define kCaseSensitiveLayoutOnSelector 0
300 #define kCaseSensitiveLayoutType 33
301 #define kCaseSensitiveSpacingOffSelector 3
302 #define kCaseSensitiveSpacingOnSelector 2
303 #define kContextualAlternatesOffSelector 1
304 #define kContextualAlternatesOnSelector 0
305 #define kContextualAlternatesType 36
306 #define kContextualLigaturesOffSelector 19
307 #define kContextualLigaturesOnSelector 18
308 #define kContextualSwashAlternatesOffSelector 5
309 #define kContextualSwashAlternatesOnSelector 4
310 #define kDefaultLowerCaseSelector 0
311 #define kDefaultUpperCaseSelector 0
312 #define kHistoricalLigaturesOffSelector 21
313 #define kHistoricalLigaturesOnSelector 20
314 #define kHojoCharactersSelector 12
315 #define kJIS2004CharactersSelector 11
316 #define kLowerCasePetiteCapsSelector 2
317 #define kLowerCaseSmallCapsSelector 1
318 #define kLowerCaseType 37
319 #define kMathematicalGreekOffSelector 11
320 #define kMathematicalGreekOnSelector 10
321 #define kNLCCharactersSelector 13
322 #define kQuarterWidthTextSelector 4
323 #define kScientificInferiorsSelector 4
324 #define kStylisticAltEightOffSelector 17
325 #define kStylisticAltEightOnSelector 16
326 #define kStylisticAltEighteenOffSelector 37
327 #define kStylisticAltEighteenOnSelector 36
328 #define kStylisticAltElevenOffSelector 23
329 #define kStylisticAltElevenOnSelector 22
330 #define kStylisticAltFifteenOffSelector 31
331 #define kStylisticAltFifteenOnSelector 30
332 #define kStylisticAltFiveOffSelector 11
333 #define kStylisticAltFiveOnSelector 10
334 #define kStylisticAltFourOffSelector 9
335 #define kStylisticAltFourOnSelector 8
336 #define kStylisticAltFourteenOffSelector 29
337 #define kStylisticAltFourteenOnSelector 28
338 #define kStylisticAltNineOffSelector 19
339 #define kStylisticAltNineOnSelector 18
340 #define kStylisticAltNineteenOffSelector 39
341 #define kStylisticAltNineteenOnSelector 38
342 #define kStylisticAltOneOffSelector 3
343 #define kStylisticAltOneOnSelector 2
344 #define kStylisticAltSevenOffSelector 15
345 #define kStylisticAltSevenOnSelector 14
346 #define kStylisticAltSeventeenOffSelector 35
347 #define kStylisticAltSeventeenOnSelector 34
348 #define kStylisticAltSixOffSelector 13
349 #define kStylisticAltSixOnSelector 12
350 #define kStylisticAltSixteenOffSelector 33
351 #define kStylisticAltSixteenOnSelector 32
352 #define kStylisticAltTenOffSelector 21
353 #define kStylisticAltTenOnSelector 20
354 #define kStylisticAltThirteenOffSelector 27
355 #define kStylisticAltThirteenOnSelector 26
356 #define kStylisticAltThreeOffSelector 7
357 #define kStylisticAltThreeOnSelector 6
358 #define kStylisticAltTwelveOffSelector 25
359 #define kStylisticAltTwelveOnSelector 24
360 #define kStylisticAltTwentyOffSelector 41
361 #define kStylisticAltTwentyOnSelector 40
362 #define kStylisticAltTwoOffSelector 5
363 #define kStylisticAltTwoOnSelector 4
364 #define kStylisticAlternativesType 35
365 #define kSwashAlternatesOffSelector 3
366 #define kSwashAlternatesOnSelector 2
367 #define kThirdWidthTextSelector 3
368 #define kTraditionalNamesCharactersSelector 14
369 #define kUpperCasePetiteCapsSelector 2
370 #define kUpperCaseSmallCapsSelector 1
371 #define kUpperCaseType 38
372
373 /* Table data courtesy of Apple. */
374 static const struct feature_mapping_t {
375 FourCharCode otFeatureTag;
376 uint16_t aatFeatureType;
377 uint16_t selectorToEnable;
378 uint16_t selectorToDisable;
379 } feature_mappings[] = {
380 { 'c2pc', kUpperCaseType, kUpperCasePetiteCapsSelector, kDefaultUpperCaseSelector },
381 { 'c2sc', kUpperCaseType, kUpperCaseSmallCapsSelector, kDefaultUpperCaseSelector },
382 { 'calt', kContextualAlternatesType, kContextualAlternatesOnSelector, kContextualAlternatesOffSelector },
383 { 'case', kCaseSensitiveLayoutType, kCaseSensitiveLayoutOnSelector, kCaseSensitiveLayoutOffSelector },
384 { 'clig', kLigaturesType, kContextualLigaturesOnSelector, kContextualLigaturesOffSelector },
385 { 'cpsp', kCaseSensitiveLayoutType, kCaseSensitiveSpacingOnSelector, kCaseSensitiveSpacingOffSelector },
386 { 'cswh', kContextualAlternatesType, kContextualSwashAlternatesOnSelector, kContextualSwashAlternatesOffSelector },
387 { 'dlig', kLigaturesType, kRareLigaturesOnSelector, kRareLigaturesOffSelector },
388 { 'expt', kCharacterShapeType, kExpertCharactersSelector, 16 },
389 { 'frac', kFractionsType, kDiagonalFractionsSelector, kNoFractionsSelector },
390 { 'fwid', kTextSpacingType, kMonospacedTextSelector, 7 },
391 { 'halt', kTextSpacingType, kAltHalfWidthTextSelector, 7 },
392 { 'hist', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector },
393 { 'hkna', kAlternateKanaType, kAlternateHorizKanaOnSelector, kAlternateHorizKanaOffSelector, },
394 { 'hlig', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector },
395 { 'hngl', kTransliterationType, kHanjaToHangulSelector, kNoTransliterationSelector },
396 { 'hojo', kCharacterShapeType, kHojoCharactersSelector, 16 },
397 { 'hwid', kTextSpacingType, kHalfWidthTextSelector, 7 },
398 { 'ital', kItalicCJKRomanType, kCJKItalicRomanOnSelector, kCJKItalicRomanOffSelector },
399 { 'jp04', kCharacterShapeType, kJIS2004CharactersSelector, 16 },
400 { 'jp78', kCharacterShapeType, kJIS1978CharactersSelector, 16 },
401 { 'jp83', kCharacterShapeType, kJIS1983CharactersSelector, 16 },
402 { 'jp90', kCharacterShapeType, kJIS1990CharactersSelector, 16 },
403 { 'liga', kLigaturesType, kCommonLigaturesOnSelector, kCommonLigaturesOffSelector },
404 { 'lnum', kNumberCaseType, kUpperCaseNumbersSelector, 2 },
405 { 'mgrk', kMathematicalExtrasType, kMathematicalGreekOnSelector, kMathematicalGreekOffSelector },
406 { 'nlck', kCharacterShapeType, kNLCCharactersSelector, 16 },
407 { 'onum', kNumberCaseType, kLowerCaseNumbersSelector, 2 },
408 { 'ordn', kVerticalPositionType, kOrdinalsSelector, kNormalPositionSelector },
409 { 'palt', kTextSpacingType, kAltProportionalTextSelector, 7 },
410 { 'pcap', kLowerCaseType, kLowerCasePetiteCapsSelector, kDefaultLowerCaseSelector },
411 { 'pkna', kTextSpacingType, kProportionalTextSelector, 7 },
412 { 'pnum', kNumberSpacingType, kProportionalNumbersSelector, 4 },
413 { 'pwid', kTextSpacingType, kProportionalTextSelector, 7 },
414 { 'qwid', kTextSpacingType, kQuarterWidthTextSelector, 7 },
415 { 'ruby', kRubyKanaType, kRubyKanaOnSelector, kRubyKanaOffSelector },
416 { 'sinf', kVerticalPositionType, kScientificInferiorsSelector, kNormalPositionSelector },
417 { 'smcp', kLowerCaseType, kLowerCaseSmallCapsSelector, kDefaultLowerCaseSelector },
418 { 'smpl', kCharacterShapeType, kSimplifiedCharactersSelector, 16 },
419 { 'ss01', kStylisticAlternativesType, kStylisticAltOneOnSelector, kStylisticAltOneOffSelector },
420 { 'ss02', kStylisticAlternativesType, kStylisticAltTwoOnSelector, kStylisticAltTwoOffSelector },
421 { 'ss03', kStylisticAlternativesType, kStylisticAltThreeOnSelector, kStylisticAltThreeOffSelector },
422 { 'ss04', kStylisticAlternativesType, kStylisticAltFourOnSelector, kStylisticAltFourOffSelector },
423 { 'ss05', kStylisticAlternativesType, kStylisticAltFiveOnSelector, kStylisticAltFiveOffSelector },
424 { 'ss06', kStylisticAlternativesType, kStylisticAltSixOnSelector, kStylisticAltSixOffSelector },
425 { 'ss07', kStylisticAlternativesType, kStylisticAltSevenOnSelector, kStylisticAltSevenOffSelector },
426 { 'ss08', kStylisticAlternativesType, kStylisticAltEightOnSelector, kStylisticAltEightOffSelector },
427 { 'ss09', kStylisticAlternativesType, kStylisticAltNineOnSelector, kStylisticAltNineOffSelector },
428 { 'ss10', kStylisticAlternativesType, kStylisticAltTenOnSelector, kStylisticAltTenOffSelector },
429 { 'ss11', kStylisticAlternativesType, kStylisticAltElevenOnSelector, kStylisticAltElevenOffSelector },
430 { 'ss12', kStylisticAlternativesType, kStylisticAltTwelveOnSelector, kStylisticAltTwelveOffSelector },
431 { 'ss13', kStylisticAlternativesType, kStylisticAltThirteenOnSelector, kStylisticAltThirteenOffSelector },
432 { 'ss14', kStylisticAlternativesType, kStylisticAltFourteenOnSelector, kStylisticAltFourteenOffSelector },
433 { 'ss15', kStylisticAlternativesType, kStylisticAltFifteenOnSelector, kStylisticAltFifteenOffSelector },
434 { 'ss16', kStylisticAlternativesType, kStylisticAltSixteenOnSelector, kStylisticAltSixteenOffSelector },
435 { 'ss17', kStylisticAlternativesType, kStylisticAltSeventeenOnSelector, kStylisticAltSeventeenOffSelector },
436 { 'ss18', kStylisticAlternativesType, kStylisticAltEighteenOnSelector, kStylisticAltEighteenOffSelector },
437 { 'ss19', kStylisticAlternativesType, kStylisticAltNineteenOnSelector, kStylisticAltNineteenOffSelector },
438 { 'ss20', kStylisticAlternativesType, kStylisticAltTwentyOnSelector, kStylisticAltTwentyOffSelector },
439 { 'subs', kVerticalPositionType, kInferiorsSelector, kNormalPositionSelector },
440 { 'sups', kVerticalPositionType, kSuperiorsSelector, kNormalPositionSelector },
441 { 'swsh', kContextualAlternatesType, kSwashAlternatesOnSelector, kSwashAlternatesOffSelector },
442 { 'titl', kStyleOptionsType, kTitlingCapsSelector, kNoStyleOptionsSelector },
443 { 'tnam', kCharacterShapeType, kTraditionalNamesCharactersSelector, 16 },
444 { 'tnum', kNumberSpacingType, kMonospacedNumbersSelector, 4 },
445 { 'trad', kCharacterShapeType, kTraditionalCharactersSelector, 16 },
446 { 'twid', kTextSpacingType, kThirdWidthTextSelector, 7 },
447 { 'unic', kLetterCaseType, 14, 15 },
448 { 'valt', kTextSpacingType, kAltProportionalTextSelector, 7 },
449 { 'vert', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector },
450 { 'vhal', kTextSpacingType, kAltHalfWidthTextSelector, 7 },
451 { 'vkna', kAlternateKanaType, kAlternateVertKanaOnSelector, kAlternateVertKanaOffSelector },
452 { 'vpal', kTextSpacingType, kAltProportionalTextSelector, 7 },
453 { 'vrt2', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector },
454 { 'zero', kTypographicExtrasType, kSlashedZeroOnSelector, kSlashedZeroOffSelector },
455 };
456
457 static int
458 _hb_feature_mapping_cmp (const void *key_, const void *entry_)
459 {
460 unsigned int key = * (unsigned int *) key_;
461 const feature_mapping_t * entry = (const feature_mapping_t *) entry_;
462 return key < entry->otFeatureTag ? -1 :
463 key > entry->otFeatureTag ? 1 :
464 0;
465 }
466
467 hb_bool_t
468 _hb_coretext_shape (hb_shape_plan_t *shape_plan,
469 hb_font_t *font,
470 hb_buffer_t *buffer,
471 const hb_feature_t *features,
472 unsigned int num_features)
473 {
474 hb_face_t *face = font->face;
475 hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
476 hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
477
478 /* Attach marks to their bases, to match the 'ot' shaper.
479 * Adapted from hb-ot-shape:hb_form_clusters().
480 * Note that this only makes us be closer to the 'ot' shaper,
481 * but by no means the same. For example, if there's
482 * B1 M1 B2 M2, and B1-B2 form a ligature, M2's cluster will
483 * continue pointing to B2 even though B2 was merged into B1's
484 * cluster... */
485 {
486 hb_unicode_funcs_t *unicode = buffer->unicode;
487 unsigned int count = buffer->len;
488 hb_glyph_info_t *info = buffer->info;
489 for (unsigned int i = 1; i < count; i++)
490 if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (unicode->general_category (info[i].codepoint)))
491 buffer->merge_clusters (i - 1, i + 1);
492 }
493
494 hb_auto_array_t<feature_record_t> feature_records;
495 hb_auto_array_t<range_record_t> range_records;
496
497 /*
498 * Set up features.
499 * (copied + modified from code from hb-uniscribe.cc)
500 */
501 if (num_features)
502 {
503 /* Sort features by start/end events. */
504 hb_auto_array_t<feature_event_t> feature_events;
505 for (unsigned int i = 0; i < num_features; i++)
506 {
507 const feature_mapping_t * mapping = (const feature_mapping_t *) bsearch (&features[i].tag,
508 feature_mappings,
509 ARRAY_LENGTH (feature_mappings),
510 sizeof (feature_mappings[0]),
511 _hb_feature_mapping_cmp);
512 if (!mapping)
513 continue;
514
515 active_feature_t feature;
516 feature.rec.feature = mapping->aatFeatureType;
517 feature.rec.setting = features[i].value ? mapping->selectorToEnable : mapping->selectorToDisable;
518 feature.order = i;
519
520 feature_event_t *event;
521
522 event = feature_events.push ();
523 if (unlikely (!event))
524 goto fail_features;
525 event->index = features[i].start;
526 event->start = true;
527 event->feature = feature;
528
529 event = feature_events.push ();
530 if (unlikely (!event))
531 goto fail_features;
532 event->index = features[i].end;
533 event->start = false;
534 event->feature = feature;
535 }
536 feature_events.qsort ();
537 /* Add a strategic final event. */
538 {
539 active_feature_t feature;
540 feature.rec.feature = HB_TAG_NONE;
541 feature.rec.setting = 0;
542 feature.order = num_features + 1;
543
544 feature_event_t *event = feature_events.push ();
545 if (unlikely (!event))
546 goto fail_features;
547 event->index = 0; /* This value does magic. */
548 event->start = false;
549 event->feature = feature;
550 }
551
552 /* Scan events and save features for each range. */
553 hb_auto_array_t<active_feature_t> active_features;
554 unsigned int last_index = 0;
555 for (unsigned int i = 0; i < feature_events.len; i++)
556 {
557 feature_event_t *event = &feature_events[i];
558
559 if (event->index != last_index)
560 {
561 /* Save a snapshot of active features and the range. */
562 range_record_t *range = range_records.push ();
563 if (unlikely (!range))
564 goto fail_features;
565
566 if (active_features.len)
567 {
568 CFMutableArrayRef features_array = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
569
570 /* TODO sort and resolve conflicting features? */
571 /* active_features.qsort (); */
572 for (unsigned int j = 0; j < active_features.len; j++)
573 {
574 CFStringRef keys[2] = {
575 kCTFontFeatureTypeIdentifierKey,
576 kCTFontFeatureSelectorIdentifierKey
577 };
578 CFNumberRef values[2] = {
579 CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.feature),
580 CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting)
581 };
582 CFDictionaryRef dict = CFDictionaryCreate (kCFAllocatorDefault,
583 (const void **) keys,
584 (const void **) values,
585 2,
586 &kCFTypeDictionaryKeyCallBacks,
587 &kCFTypeDictionaryValueCallBacks);
588 CFRelease (values[0]);
589 CFRelease (values[1]);
590
591 CFArrayAppendValue (features_array, dict);
592 CFRelease (dict);
593
594 }
595
596 CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,
597 (const void **) &kCTFontFeatureSettingsAttribute,
598 (const void **) &features_array,
599 1,
600 &kCFTypeDictionaryKeyCallBacks,
601 &kCFTypeDictionaryValueCallBacks);
602 CFRelease (features_array);
603
604 CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);
605 CFRelease (attributes);
606
607 range->font = CTFontCreateCopyWithAttributes (font_data->ct_font, 0.0, NULL, font_desc);
608 CFRelease (font_desc);
609 }
610 else
611 {
612 range->font = NULL;
613 }
614
615 range->index_first = last_index;
616 range->index_last = event->index - 1;
617
618 last_index = event->index;
619 }
620
621 if (event->start) {
622 active_feature_t *feature = active_features.push ();
623 if (unlikely (!feature))
624 goto fail_features;
625 *feature = event->feature;
626 } else {
627 active_feature_t *feature = active_features.find (&event->feature);
628 if (feature)
629 active_features.remove (feature - active_features.array);
630 }
631 }
632
633 if (!range_records.len) /* No active feature found. */
634 goto fail_features;
635 }
636 else
637 {
638 fail_features:
639 num_features = 0;
640 }
641
642 unsigned int scratch_size;
643 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
644
645 #define ALLOCATE_ARRAY(Type, name, len, on_no_room) \
646 Type *name = (Type *) scratch; \
647 { \
648 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
649 if (unlikely (_consumed > scratch_size)) \
650 { \
651 on_no_room; \
652 assert (0); \
653 } \
654 scratch += _consumed; \
655 scratch_size -= _consumed; \
656 }
657
658 ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2, /*nothing*/);
659 unsigned int chars_len = 0;
660 for (unsigned int i = 0; i < buffer->len; i++) {
661 hb_codepoint_t c = buffer->info[i].codepoint;
662 if (likely (c <= 0xFFFFu))
663 pchars[chars_len++] = c;
664 else if (unlikely (c > 0x10FFFFu))
665 pchars[chars_len++] = 0xFFFDu;
666 else {
667 pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10);
668 pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1 << 10) - 1));
669 }
670 }
671
672 ALLOCATE_ARRAY (unsigned int, log_clusters, chars_len, /*nothing*/);
673 chars_len = 0;
674 for (unsigned int i = 0; i < buffer->len; i++)
675 {
676 hb_codepoint_t c = buffer->info[i].codepoint;
677 unsigned int cluster = buffer->info[i].cluster;
678 log_clusters[chars_len++] = cluster;
679 if (hb_in_range (c, 0x10000u, 0x10FFFFu))
680 log_clusters[chars_len++] = cluster; /* Surrogates. */
681 }
682
683 #define FAIL(...) \
684 HB_STMT_START { \
685 DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \
686 ret = false; \
687 goto fail; \
688 } HB_STMT_END;
689
690 bool ret = true;
691 CFStringRef string_ref = NULL;
692 CTLineRef line = NULL;
693
694 if (0)
695 {
696 resize_and_retry:
697 DEBUG_MSG (CORETEXT, buffer, "Buffer resize");
698 /* string_ref uses the scratch-buffer for backing store, and line references
699 * string_ref (via attr_string). We must release those before resizing buffer. */
700 assert (string_ref);
701 assert (line);
702 CFRelease (string_ref);
703 CFRelease (line);
704 string_ref = NULL;
705 line = NULL;
706
707 /* Get previous start-of-scratch-area, that we use later for readjusting
708 * our existing scratch arrays. */
709 unsigned int old_scratch_used;
710 hb_buffer_t::scratch_buffer_t *old_scratch;
711 old_scratch = buffer->get_scratch_buffer (&old_scratch_used);
712 old_scratch_used = scratch - old_scratch;
713
714 if (unlikely (!buffer->ensure (buffer->allocated * 2)))
715 FAIL ("Buffer resize failed");
716
717 /* Adjust scratch, pchars, and log_cluster arrays. This is ugly, but really the
718 * cleanest way to do without completely restructuring the rest of this shaper. */
719 scratch = buffer->get_scratch_buffer (&scratch_size);
720 pchars = reinterpret_cast<UniChar *> (((char *) scratch + ((char *) pchars - (char *) old_scratch)));
721 log_clusters = reinterpret_cast<unsigned int *> (((char *) scratch + ((char *) log_clusters - (char *) old_scratch)));
722 scratch += old_scratch_used;
723 scratch_size -= old_scratch_used;
724 }
725 retry:
726 {
727 string_ref = CFStringCreateWithCharactersNoCopy (NULL,
728 pchars, chars_len,
729 kCFAllocatorNull);
730 if (unlikely (!string_ref))
731 FAIL ("CFStringCreateWithCharactersNoCopy failed");
732
733 /* Create an attributed string, populate it, and create a line from it, then release attributed string. */
734 {
735 CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (kCFAllocatorDefault,
736 chars_len);
737 if (unlikely (!attr_string))
738 FAIL ("CFAttributedStringCreateMutable failed");
739 CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref);
740 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
741 {
742 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
743 kCTVerticalFormsAttributeName, kCFBooleanTrue);
744 }
745
746 if (buffer->props.language)
747 {
748 /* What's the iOS equivalent of this check?
749 * The symbols was introduced in iOS 7.0.
750 * At any rate, our fallback is safe and works fine. */
751 #if MAC_OS_X_VERSION_MIN_REQUIRED < 1090
752 # define kCTLanguageAttributeName CFSTR ("NSLanguage")
753 #endif
754 CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault,
755 hb_language_to_string (buffer->props.language),
756 kCFStringEncodingUTF8,
757 kCFAllocatorNull);
758 if (unlikely (!lang))
759 FAIL ("CFStringCreateWithCStringNoCopy failed");
760 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
761 kCTLanguageAttributeName, lang);
762 CFRelease (lang);
763 }
764 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
765 kCTFontAttributeName, font_data->ct_font);
766
767 if (num_features)
768 {
769 unsigned int start = 0;
770 range_record_t *last_range = &range_records[0];
771 for (unsigned int k = 0; k < chars_len; k++)
772 {
773 range_record_t *range = last_range;
774 while (log_clusters[k] < range->index_first)
775 range--;
776 while (log_clusters[k] > range->index_last)
777 range++;
778 if (range != last_range)
779 {
780 if (last_range->font)
781 CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, k - start),
782 kCTFontAttributeName, last_range->font);
783
784 start = k;
785 }
786
787 last_range = range;
788 }
789 if (start != chars_len && last_range->font)
790 CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, chars_len - start),
791 kCTFontAttributeName, last_range->font);
792 }
793
794 int level = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;
795 CFNumberRef level_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &level);
796 CFDictionaryRef options = CFDictionaryCreate (kCFAllocatorDefault,
797 (const void **) &kCTTypesetterOptionForcedEmbeddingLevel,
798 (const void **) &level_number,
799 1,
800 &kCFTypeDictionaryKeyCallBacks,
801 &kCFTypeDictionaryValueCallBacks);
802 if (unlikely (!options))
803 FAIL ("CFDictionaryCreate failed");
804
805 CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions (attr_string, options);
806 CFRelease (options);
807 CFRelease (attr_string);
808 if (unlikely (!typesetter))
809 FAIL ("CTTypesetterCreateWithAttributedStringAndOptions failed");
810
811 line = CTTypesetterCreateLine (typesetter, CFRangeMake(0, 0));
812 CFRelease (typesetter);
813 if (unlikely (!line))
814 FAIL ("CTTypesetterCreateLine failed");
815 }
816
817 CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
818 unsigned int num_runs = CFArrayGetCount (glyph_runs);
819 DEBUG_MSG (CORETEXT, NULL, "Num runs: %d", num_runs);
820
821 buffer->len = 0;
822 uint32_t status_and = ~0, status_or = 0;
823 double advances_so_far = 0;
824 /* For right-to-left runs, CoreText returns the glyphs positioned such that
825 * any trailing whitespace is to the left of (0,0). Adjust coordinate system
826 * to fix for that. Test with any RTL string with trailing spaces.
827 * https://code.google.com/p/chromium/issues/detail?id=469028
828 */
829 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
830 {
831 advances_so_far -= CTLineGetTrailingWhitespaceWidth (line);
832 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
833 advances_so_far = -advances_so_far;
834 }
835
836 const CFRange range_all = CFRangeMake (0, 0);
837
838 for (unsigned int i = 0; i < num_runs; i++)
839 {
840 CTRunRef run = static_cast<CTRunRef>(CFArrayGetValueAtIndex (glyph_runs, i));
841 CTRunStatus run_status = CTRunGetStatus (run);
842 status_or |= run_status;
843 status_and &= run_status;
844 DEBUG_MSG (CORETEXT, run, "CTRunStatus: %x", run_status);
845 double run_advance = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL);
846 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
847 run_advance = -run_advance;
848 DEBUG_MSG (CORETEXT, run, "Run advance: %g", run_advance);
849
850 /* CoreText does automatic font fallback (AKA "cascading") for characters
851 * not supported by the requested font, and provides no way to turn it off,
852 * so we must detect if the returned run uses a font other than the requested
853 * one and fill in the buffer with .notdef glyphs instead of random glyph
854 * indices from a different font.
855 */
856 CFDictionaryRef attributes = CTRunGetAttributes (run);
857 CTFontRef run_ct_font = static_cast<CTFontRef>(CFDictionaryGetValue (attributes, kCTFontAttributeName));
858 if (!CFEqual (run_ct_font, font_data->ct_font))
859 {
860 /* The run doesn't use our main font instance. We have to figure out
861 * whether font fallback happened, or this is just CoreText giving us
862 * another CTFont using the same underlying CGFont. CoreText seems
863 * to do that in a variety of situations, one of which being vertical
864 * text, but also perhaps for caching reasons.
865 *
866 * First, see if it uses any of our subfonts created to set font features...
867 *
868 * Next, compare the CGFont to the one we used to create our fonts.
869 * Even this doesn't work all the time.
870 *
871 * Finally, we compare PS names, which I don't think are unique...
872 *
873 * Looks like if we really want to be sure here we have to modify the
874 * font to change the name table, similar to what we do in the uniscribe
875 * backend.
876 *
877 * However, even that wouldn't work if we were passed in the CGFont to
878 * begin with.
879 *
880 * Webkit uses a slightly different approach: it installs LastResort
881 * as fallback chain, and then checks PS name of used font against
882 * LastResort. That one is safe for any font except for LastResort,
883 * as opposed to ours, which can fail if we are using any uninstalled
884 * font that has the same name as an installed font.
885 *
886 * See: http://github.com/behdad/harfbuzz/pull/36
887 */
888 bool matched = false;
889 for (unsigned int i = 0; i < range_records.len; i++)
890 if (range_records[i].font && CFEqual (run_ct_font, range_records[i].font))
891 {
892 matched = true;
893 break;
894 }
895 if (!matched)
896 {
897 CGFontRef run_cg_font = CTFontCopyGraphicsFont (run_ct_font, 0);
898 if (run_cg_font)
899 {
900 matched = CFEqual (run_cg_font, face_data);
901 CFRelease (run_cg_font);
902 }
903 }
904 if (!matched)
905 {
906 CFStringRef font_ps_name = CTFontCopyName (font_data->ct_font, kCTFontPostScriptNameKey);
907 CFStringRef run_ps_name = CTFontCopyName (run_ct_font, kCTFontPostScriptNameKey);
908 CFComparisonResult result = CFStringCompare (run_ps_name, font_ps_name, 0);
909 CFRelease (run_ps_name);
910 CFRelease (font_ps_name);
911 if (result == kCFCompareEqualTo)
912 matched = true;
913 }
914 if (!matched)
915 {
916 CFRange range = CTRunGetStringRange (run);
917 DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld",
918 range.location, range.location + range.length);
919 if (!buffer->ensure_inplace (buffer->len + range.length))
920 goto resize_and_retry;
921 hb_glyph_info_t *info = buffer->info + buffer->len;
922
923 hb_codepoint_t notdef = 0;
924 hb_direction_t dir = buffer->props.direction;
925 hb_position_t x_advance, y_advance, x_offset, y_offset;
926 hb_font_get_glyph_advance_for_direction (font, notdef, dir, &x_advance, &y_advance);
927 hb_font_get_glyph_origin_for_direction (font, notdef, dir, &x_offset, &y_offset);
928 hb_position_t advance = x_advance + y_advance;
929 x_offset = -x_offset;
930 y_offset = -y_offset;
931
932 unsigned int old_len = buffer->len;
933 for (CFIndex j = range.location; j < range.location + range.length; j++)
934 {
935 UniChar ch = CFStringGetCharacterAtIndex (string_ref, j);
936 if (hb_in_range<UniChar> (ch, 0xDC00u, 0xDFFFu) && range.location < j)
937 {
938 ch = CFStringGetCharacterAtIndex (string_ref, j - 1);
939 if (hb_in_range<UniChar> (ch, 0xD800u, 0xDBFFu))
940 /* This is the second of a surrogate pair. Don't need .notdef
941 * for this one. */
942 continue;
943 }
944 if (buffer->unicode->is_default_ignorable (ch))
945 continue;
946
947 info->codepoint = notdef;
948 info->cluster = log_clusters[j];
949
950 info->mask = advance;
951 info->var1.i32 = x_offset;
952 info->var2.i32 = y_offset;
953
954 info++;
955 buffer->len++;
956 }
957 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
958 buffer->reverse_range (old_len, buffer->len);
959 advances_so_far += run_advance;
960 continue;
961 }
962 }
963
964 unsigned int num_glyphs = CTRunGetGlyphCount (run);
965 if (num_glyphs == 0)
966 continue;
967
968 if (!buffer->ensure_inplace (buffer->len + num_glyphs))
969 goto resize_and_retry;
970
971 hb_glyph_info_t *run_info = buffer->info + buffer->len;
972
973 /* Testing used to indicate that CTRunGetGlyphsPtr, etc (almost?) always
974 * succeed, and so copying data to our own buffer will be rare. Reports
975 * have it that this changed in OS X 10.10 Yosemite, and NULL is returned
976 * frequently. At any rate, we can test that codepath by setting USE_PTR
977 * to false. */
978
979 #define USE_PTR true
980
981 #define SCRATCH_SAVE() \
982 unsigned int scratch_size_saved = scratch_size; \
983 hb_buffer_t::scratch_buffer_t *scratch_saved = scratch
984
985 #define SCRATCH_RESTORE() \
986 scratch_size = scratch_size_saved; \
987 scratch = scratch_saved;
988
989 { /* Setup glyphs */
990 SCRATCH_SAVE();
991 const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : NULL;
992 if (!glyphs) {
993 ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry);
994 CTRunGetGlyphs (run, range_all, glyph_buf);
995 glyphs = glyph_buf;
996 }
997 const CFIndex* string_indices = USE_PTR ? CTRunGetStringIndicesPtr (run) : NULL;
998 if (!string_indices) {
999 ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs, goto resize_and_retry);
1000 CTRunGetStringIndices (run, range_all, index_buf);
1001 string_indices = index_buf;
1002 }
1003 hb_glyph_info_t *info = run_info;
1004 for (unsigned int j = 0; j < num_glyphs; j++)
1005 {
1006 info->codepoint = glyphs[j];
1007 info->cluster = log_clusters[string_indices[j]];
1008 info++;
1009 }
1010 SCRATCH_RESTORE();
1011 }
1012 {
1013 /* Setup positions.
1014 * Note that CoreText does not return advances for glyphs. As such,
1015 * for all but last glyph, we use the delta position to next glyph as
1016 * advance (in the advance direction only), and for last glyph we set
1017 * whatever is needed to make the whole run's advance add up. */
1018 SCRATCH_SAVE();
1019 const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : NULL;
1020 if (!positions) {
1021 ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry);
1022 CTRunGetPositions (run, range_all, position_buf);
1023 positions = position_buf;
1024 }
1025 hb_glyph_info_t *info = run_info;
1026 CGFloat x_mult = font_data->x_mult, y_mult = font_data->y_mult;
1027 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
1028 {
1029 hb_position_t x_offset = (positions[0].x - advances_so_far) * x_mult;
1030 for (unsigned int j = 0; j < num_glyphs; j++)
1031 {
1032 double advance;
1033 if (likely (j + 1 < num_glyphs))
1034 advance = positions[j + 1].x - positions[j].x;
1035 else /* last glyph */
1036 advance = run_advance - (positions[j].x - positions[0].x);
1037 info->mask = advance * x_mult;
1038 info->var1.i32 = x_offset;
1039 info->var2.i32 = positions[j].y * y_mult;
1040 info++;
1041 }
1042 }
1043 else
1044 {
1045 hb_position_t y_offset = (positions[0].y - advances_so_far) * y_mult;
1046 for (unsigned int j = 0; j < num_glyphs; j++)
1047 {
1048 double advance;
1049 if (likely (j + 1 < num_glyphs))
1050 advance = positions[j + 1].y - positions[j].y;
1051 else /* last glyph */
1052 advance = run_advance - (positions[j].y - positions[0].y);
1053 info->mask = advance * y_mult;
1054 info->var1.i32 = positions[j].x * x_mult;
1055 info->var2.i32 = y_offset;
1056 info++;
1057 }
1058 }
1059 SCRATCH_RESTORE();
1060 advances_so_far += run_advance;
1061 }
1062 #undef SCRATCH_RESTORE
1063 #undef SCRATCH_SAVE
1064 #undef USE_PTR
1065 #undef ALLOCATE_ARRAY
1066
1067 buffer->len += num_glyphs;
1068 }
1069
1070 /* Mac OS 10.6 doesn't have kCTTypesetterOptionForcedEmbeddingLevel,
1071 * or if it does, it doesn't resepct it. So we get runs with wrong
1072 * directions. As such, disable the assert... It wouldn't crash, but
1073 * cursoring will be off...
1074 *
1075 * http://crbug.com/419769
1076 */
1077 if (0)
1078 {
1079 /* Make sure all runs had the expected direction. */
1080 bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
1081 assert (bool (status_and & kCTRunStatusRightToLeft) == backward);
1082 assert (bool (status_or & kCTRunStatusRightToLeft) == backward);
1083 }
1084
1085 buffer->clear_positions ();
1086
1087 unsigned int count = buffer->len;
1088 hb_glyph_info_t *info = buffer->info;
1089 hb_glyph_position_t *pos = buffer->pos;
1090 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
1091 for (unsigned int i = 0; i < count; i++)
1092 {
1093 pos->x_advance = info->mask;
1094 pos->x_offset = info->var1.i32;
1095 pos->y_offset = info->var2.i32;
1096 info++, pos++;
1097 }
1098 else
1099 for (unsigned int i = 0; i < count; i++)
1100 {
1101 pos->y_advance = info->mask;
1102 pos->x_offset = info->var1.i32;
1103 pos->y_offset = info->var2.i32;
1104 info++, pos++;
1105 }
1106
1107 /* Fix up clusters so that we never return out-of-order indices;
1108 * if core text has reordered glyphs, we'll merge them to the
1109 * beginning of the reordered cluster. CoreText is nice enough
1110 * to tell us whenever it has produced nonmonotonic results...
1111 * Note that we assume the input clusters were nonmonotonic to
1112 * begin with.
1113 *
1114 * This does *not* mean we'll form the same clusters as Uniscribe
1115 * or the native OT backend, only that the cluster indices will be
1116 * monotonic in the output buffer. */
1117 if (count > 1 && (status_or & kCTRunStatusNonMonotonic))
1118 {
1119 hb_glyph_info_t *info = buffer->info;
1120 if (HB_DIRECTION_IS_FORWARD (buffer->props.direction))
1121 {
1122 unsigned int cluster = info[count - 1].cluster;
1123 for (unsigned int i = count - 1; i > 0; i--)
1124 {
1125 cluster = MIN (cluster, info[i - 1].cluster);
1126 info[i - 1].cluster = cluster;
1127 }
1128 }
1129 else
1130 {
1131 unsigned int cluster = info[0].cluster;
1132 for (unsigned int i = 1; i < count; i++)
1133 {
1134 cluster = MIN (cluster, info[i].cluster);
1135 info[i].cluster = cluster;
1136 }
1137 }
1138 }
1139 }
1140
1141 #undef FAIL
1142
1143 fail:
1144 if (string_ref)
1145 CFRelease (string_ref);
1146 if (line)
1147 CFRelease (line);
1148
1149 for (unsigned int i = 0; i < range_records.len; i++)
1150 if (range_records[i].font)
1151 CFRelease (range_records[i].font);
1152
1153 return ret;
1154 }
1155
1156
1157 /*
1158 * AAT shaper
1159 */
1160
1161 HB_SHAPER_DATA_ENSURE_DECLARE(coretext_aat, face)
1162 HB_SHAPER_DATA_ENSURE_DECLARE(coretext_aat, font)
1163
1164
1165 /*
1166 * shaper face data
1167 */
1168
1169 struct hb_coretext_aat_shaper_face_data_t {};
1170
1171 hb_coretext_aat_shaper_face_data_t *
1172 _hb_coretext_aat_shaper_face_data_create (hb_face_t *face)
1173 {
1174 hb_blob_t *mort_blob = face->reference_table (HB_CORETEXT_TAG_MORT);
1175 /* Umm, we just reference the table to check whether it exists.
1176 * Maybe add better API for this? */
1177 if (!hb_blob_get_length (mort_blob))
1178 {
1179 hb_blob_destroy (mort_blob);
1180 mort_blob = face->reference_table (HB_CORETEXT_TAG_MORX);
1181 if (!hb_blob_get_length (mort_blob))
1182 {
1183 hb_blob_destroy (mort_blob);
1184 return NULL;
1185 }
1186 }
1187 hb_blob_destroy (mort_blob);
1188
1189 return hb_coretext_shaper_face_data_ensure (face) ? (hb_coretext_aat_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED : NULL;
1190 }
1191
1192 void
1193 _hb_coretext_aat_shaper_face_data_destroy (hb_coretext_aat_shaper_face_data_t *data HB_UNUSED)
1194 {
1195 }
1196
1197
1198 /*
1199 * shaper font data
1200 */
1201
1202 struct hb_coretext_aat_shaper_font_data_t {};
1203
1204 hb_coretext_aat_shaper_font_data_t *
1205 _hb_coretext_aat_shaper_font_data_create (hb_font_t *font)
1206 {
1207 return hb_coretext_shaper_font_data_ensure (font) ? (hb_coretext_aat_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED : NULL;
1208 }
1209
1210 void
1211 _hb_coretext_aat_shaper_font_data_destroy (hb_coretext_aat_shaper_font_data_t *data HB_UNUSED)
1212 {
1213 }
1214
1215
1216 /*
1217 * shaper shape_plan data
1218 */
1219
1220 struct hb_coretext_aat_shaper_shape_plan_data_t {};
1221
1222 hb_coretext_aat_shaper_shape_plan_data_t *
1223 _hb_coretext_aat_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
1224 const hb_feature_t *user_features HB_UNUSED,
1225 unsigned int num_user_features HB_UNUSED)
1226 {
1227 return (hb_coretext_aat_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
1228 }
1229
1230 void
1231 _hb_coretext_aat_shaper_shape_plan_data_destroy (hb_coretext_aat_shaper_shape_plan_data_t *data HB_UNUSED)
1232 {
1233 }
1234
1235
1236 /*
1237 * shaper
1238 */
1239
1240 hb_bool_t
1241 _hb_coretext_aat_shape (hb_shape_plan_t *shape_plan,
1242 hb_font_t *font,
1243 hb_buffer_t *buffer,
1244 const hb_feature_t *features,
1245 unsigned int num_features)
1246 {
1247 return _hb_coretext_shape (shape_plan, font, buffer, features, num_features);
1248 }