Edit
kc3-lang/harfbuzz/src/hb-coretext.cc
Behdad Esfahbod
- src/hb-coretext.cc
-
/* * Copyright © 2012,2013 Mozilla Foundation. * Copyright © 2012,2013 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Mozilla Author(s): Jonathan Kew * Google Author(s): Behdad Esfahbod */ #define HB_SHAPER coretext #define hb_coretext_shaper_face_data_t CGFont #include "hb-shaper-impl-private.hh" #include "hb-coretext.h" #ifndef HB_DEBUG_CORETEXT #define HB_DEBUG_CORETEXT (HB_DEBUG+0) #endif static void release_table_data (void *user_data) { CFDataRef cf_data = reinterpret_cast<CFDataRef> (user_data); CFRelease(cf_data); } static hb_blob_t * reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data) { CGFontRef cg_font = reinterpret_cast<CGFontRef> (user_data); CFDataRef cf_data = CGFontCopyTableForTag (cg_font, tag); if (unlikely (!cf_data)) return NULL; const char *data = reinterpret_cast<const char*> (CFDataGetBytePtr (cf_data)); const size_t length = CFDataGetLength (cf_data); if (!data || !length) return NULL; return hb_blob_create (data, length, HB_MEMORY_MODE_READONLY, reinterpret_cast<void *> (const_cast<__CFData *> (cf_data)), release_table_data); } hb_face_t * hb_coretext_face_create (CGFontRef cg_font) { return hb_face_create_for_tables (reference_table, CGFontRetain (cg_font), (hb_destroy_func_t) CGFontRelease); } HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face) HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font) /* * shaper face data */ static void release_data (void *info, const void *data, size_t size) { assert (hb_blob_get_length ((hb_blob_t *) info) == size && hb_blob_get_data ((hb_blob_t *) info, NULL) == data); hb_blob_destroy ((hb_blob_t *) info); } hb_coretext_shaper_face_data_t * _hb_coretext_shaper_face_data_create (hb_face_t *face) { hb_coretext_shaper_face_data_t *data = NULL; if (face->destroy == (hb_destroy_func_t) CGFontRelease) { data = CGFontRetain ((CGFontRef) face->user_data); } else { hb_blob_t *blob = hb_face_reference_blob (face); unsigned int blob_length; const char *blob_data = hb_blob_get_data (blob, &blob_length); if (unlikely (!blob_length)) DEBUG_MSG (CORETEXT, face, "Face has empty blob"); CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data); if (likely (provider)) { data = CGFontCreateWithDataProvider (provider); CGDataProviderRelease (provider); } } if (unlikely (!data)) { DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed"); } return data; } void _hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data) { CFRelease (data); } /* * Since: 0.9.10 */ CGFontRef hb_coretext_face_get_cg_font (hb_face_t *face) { if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return NULL; hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); return face_data; } /* * shaper font data */ struct hb_coretext_shaper_font_data_t { CTFontRef ct_font; CGFloat x_mult, y_mult; /* From CT space to HB space. */ }; hb_coretext_shaper_font_data_t * _hb_coretext_shaper_font_data_create (hb_font_t *font) { if (unlikely (!hb_coretext_shaper_face_data_ensure (font->face))) return NULL; hb_coretext_shaper_font_data_t *data = (hb_coretext_shaper_font_data_t *) calloc (1, sizeof (hb_coretext_shaper_font_data_t)); if (unlikely (!data)) return NULL; hb_face_t *face = font->face; hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); /* Choose a CoreText font size and calculate multipliers to convert to HarfBuzz space. */ /* TODO: use upem instead of 36? */ CGFloat font_size = 36.; /* Default... */ /* No idea if the following is even a good idea. */ if (font->y_ppem) font_size = font->y_ppem; if (font_size < 0) font_size = -font_size; data->x_mult = (CGFloat) font->x_scale / font_size; data->y_mult = (CGFloat) font->y_scale / font_size; data->ct_font = CTFontCreateWithGraphicsFont (face_data, font_size, NULL, NULL); if (unlikely (!data->ct_font)) { DEBUG_MSG (CORETEXT, font, "Font CTFontCreateWithGraphicsFont() failed"); free (data); return NULL; } return data; } void _hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data) { CFRelease (data->ct_font); free (data); } /* * shaper shape_plan data */ struct hb_coretext_shaper_shape_plan_data_t {}; hb_coretext_shaper_shape_plan_data_t * _hb_coretext_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, const hb_feature_t *user_features HB_UNUSED, unsigned int num_user_features HB_UNUSED) { return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; } void _hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED) { } CTFontRef hb_coretext_font_get_ct_font (hb_font_t *font) { if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return NULL; hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); return font_data->ct_font; } /* * shaper */ struct feature_record_t { unsigned int feature; unsigned int setting; }; struct active_feature_t { feature_record_t rec; unsigned int order; static int cmp (const active_feature_t *a, const active_feature_t *b) { return a->rec.feature < b->rec.feature ? -1 : a->rec.feature > b->rec.feature ? 1 : a->order < b->order ? -1 : a->order > b->order ? 1 : a->rec.setting < b->rec.setting ? -1 : a->rec.setting > b->rec.setting ? 1 : 0; } bool operator== (const active_feature_t *f) { return cmp (this, f) == 0; } }; struct feature_event_t { unsigned int index; bool start; active_feature_t feature; static int cmp (const feature_event_t *a, const feature_event_t *b) { return a->index < b->index ? -1 : a->index > b->index ? 1 : a->start < b->start ? -1 : a->start > b->start ? 1 : active_feature_t::cmp (&a->feature, &b->feature); } }; struct range_record_t { CTFontRef font; unsigned int index_first; /* == start */ unsigned int index_last; /* == end - 1 */ }; /* The following enum members are added in OS X 10.8. */ #define kAltHalfWidthTextSelector 6 #define kAltProportionalTextSelector 5 #define kAlternateHorizKanaOffSelector 1 #define kAlternateHorizKanaOnSelector 0 #define kAlternateKanaType 34 #define kAlternateVertKanaOffSelector 3 #define kAlternateVertKanaOnSelector 2 #define kCaseSensitiveLayoutOffSelector 1 #define kCaseSensitiveLayoutOnSelector 0 #define kCaseSensitiveLayoutType 33 #define kCaseSensitiveSpacingOffSelector 3 #define kCaseSensitiveSpacingOnSelector 2 #define kContextualAlternatesOffSelector 1 #define kContextualAlternatesOnSelector 0 #define kContextualAlternatesType 36 #define kContextualLigaturesOffSelector 19 #define kContextualLigaturesOnSelector 18 #define kContextualSwashAlternatesOffSelector 5 #define kContextualSwashAlternatesOnSelector 4 #define kDefaultLowerCaseSelector 0 #define kDefaultUpperCaseSelector 0 #define kHistoricalLigaturesOffSelector 21 #define kHistoricalLigaturesOnSelector 20 #define kHojoCharactersSelector 12 #define kJIS2004CharactersSelector 11 #define kLowerCasePetiteCapsSelector 2 #define kLowerCaseSmallCapsSelector 1 #define kLowerCaseType 37 #define kMathematicalGreekOffSelector 11 #define kMathematicalGreekOnSelector 10 #define kNLCCharactersSelector 13 #define kQuarterWidthTextSelector 4 #define kScientificInferiorsSelector 4 #define kStylisticAltEightOffSelector 17 #define kStylisticAltEightOnSelector 16 #define kStylisticAltEighteenOffSelector 37 #define kStylisticAltEighteenOnSelector 36 #define kStylisticAltElevenOffSelector 23 #define kStylisticAltElevenOnSelector 22 #define kStylisticAltFifteenOffSelector 31 #define kStylisticAltFifteenOnSelector 30 #define kStylisticAltFiveOffSelector 11 #define kStylisticAltFiveOnSelector 10 #define kStylisticAltFourOffSelector 9 #define kStylisticAltFourOnSelector 8 #define kStylisticAltFourteenOffSelector 29 #define kStylisticAltFourteenOnSelector 28 #define kStylisticAltNineOffSelector 19 #define kStylisticAltNineOnSelector 18 #define kStylisticAltNineteenOffSelector 39 #define kStylisticAltNineteenOnSelector 38 #define kStylisticAltOneOffSelector 3 #define kStylisticAltOneOnSelector 2 #define kStylisticAltSevenOffSelector 15 #define kStylisticAltSevenOnSelector 14 #define kStylisticAltSeventeenOffSelector 35 #define kStylisticAltSeventeenOnSelector 34 #define kStylisticAltSixOffSelector 13 #define kStylisticAltSixOnSelector 12 #define kStylisticAltSixteenOffSelector 33 #define kStylisticAltSixteenOnSelector 32 #define kStylisticAltTenOffSelector 21 #define kStylisticAltTenOnSelector 20 #define kStylisticAltThirteenOffSelector 27 #define kStylisticAltThirteenOnSelector 26 #define kStylisticAltThreeOffSelector 7 #define kStylisticAltThreeOnSelector 6 #define kStylisticAltTwelveOffSelector 25 #define kStylisticAltTwelveOnSelector 24 #define kStylisticAltTwentyOffSelector 41 #define kStylisticAltTwentyOnSelector 40 #define kStylisticAltTwoOffSelector 5 #define kStylisticAltTwoOnSelector 4 #define kStylisticAlternativesType 35 #define kSwashAlternatesOffSelector 3 #define kSwashAlternatesOnSelector 2 #define kThirdWidthTextSelector 3 #define kTraditionalNamesCharactersSelector 14 #define kUpperCasePetiteCapsSelector 2 #define kUpperCaseSmallCapsSelector 1 #define kUpperCaseType 38 /* Table data courtesy of Apple. */ static const struct feature_mapping_t { FourCharCode otFeatureTag; uint16_t aatFeatureType; uint16_t selectorToEnable; uint16_t selectorToDisable; } feature_mappings[] = { { 'c2pc', kUpperCaseType, kUpperCasePetiteCapsSelector, kDefaultUpperCaseSelector }, { 'c2sc', kUpperCaseType, kUpperCaseSmallCapsSelector, kDefaultUpperCaseSelector }, { 'calt', kContextualAlternatesType, kContextualAlternatesOnSelector, kContextualAlternatesOffSelector }, { 'case', kCaseSensitiveLayoutType, kCaseSensitiveLayoutOnSelector, kCaseSensitiveLayoutOffSelector }, { 'clig', kLigaturesType, kContextualLigaturesOnSelector, kContextualLigaturesOffSelector }, { 'cpsp', kCaseSensitiveLayoutType, kCaseSensitiveSpacingOnSelector, kCaseSensitiveSpacingOffSelector }, { 'cswh', kContextualAlternatesType, kContextualSwashAlternatesOnSelector, kContextualSwashAlternatesOffSelector }, { 'dlig', kLigaturesType, kRareLigaturesOnSelector, kRareLigaturesOffSelector }, { 'expt', kCharacterShapeType, kExpertCharactersSelector, 16 }, { 'frac', kFractionsType, kDiagonalFractionsSelector, kNoFractionsSelector }, { 'fwid', kTextSpacingType, kMonospacedTextSelector, 7 }, { 'halt', kTextSpacingType, kAltHalfWidthTextSelector, 7 }, { 'hist', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector }, { 'hkna', kAlternateKanaType, kAlternateHorizKanaOnSelector, kAlternateHorizKanaOffSelector, }, { 'hlig', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector }, { 'hngl', kTransliterationType, kHanjaToHangulSelector, kNoTransliterationSelector }, { 'hojo', kCharacterShapeType, kHojoCharactersSelector, 16 }, { 'hwid', kTextSpacingType, kHalfWidthTextSelector, 7 }, { 'ital', kItalicCJKRomanType, kCJKItalicRomanOnSelector, kCJKItalicRomanOffSelector }, { 'jp04', kCharacterShapeType, kJIS2004CharactersSelector, 16 }, { 'jp78', kCharacterShapeType, kJIS1978CharactersSelector, 16 }, { 'jp83', kCharacterShapeType, kJIS1983CharactersSelector, 16 }, { 'jp90', kCharacterShapeType, kJIS1990CharactersSelector, 16 }, { 'liga', kLigaturesType, kCommonLigaturesOnSelector, kCommonLigaturesOffSelector }, { 'lnum', kNumberCaseType, kUpperCaseNumbersSelector, 2 }, { 'mgrk', kMathematicalExtrasType, kMathematicalGreekOnSelector, kMathematicalGreekOffSelector }, { 'nlck', kCharacterShapeType, kNLCCharactersSelector, 16 }, { 'onum', kNumberCaseType, kLowerCaseNumbersSelector, 2 }, { 'ordn', kVerticalPositionType, kOrdinalsSelector, kNormalPositionSelector }, { 'palt', kTextSpacingType, kAltProportionalTextSelector, 7 }, { 'pcap', kLowerCaseType, kLowerCasePetiteCapsSelector, kDefaultLowerCaseSelector }, { 'pkna', kTextSpacingType, kProportionalTextSelector, 7 }, { 'pnum', kNumberSpacingType, kProportionalNumbersSelector, 4 }, { 'pwid', kTextSpacingType, kProportionalTextSelector, 7 }, { 'qwid', kTextSpacingType, kQuarterWidthTextSelector, 7 }, { 'ruby', kRubyKanaType, kRubyKanaOnSelector, kRubyKanaOffSelector }, { 'sinf', kVerticalPositionType, kScientificInferiorsSelector, kNormalPositionSelector }, { 'smcp', kLowerCaseType, kLowerCaseSmallCapsSelector, kDefaultLowerCaseSelector }, { 'smpl', kCharacterShapeType, kSimplifiedCharactersSelector, 16 }, { 'ss01', kStylisticAlternativesType, kStylisticAltOneOnSelector, kStylisticAltOneOffSelector }, { 'ss02', kStylisticAlternativesType, kStylisticAltTwoOnSelector, kStylisticAltTwoOffSelector }, { 'ss03', kStylisticAlternativesType, kStylisticAltThreeOnSelector, kStylisticAltThreeOffSelector }, { 'ss04', kStylisticAlternativesType, kStylisticAltFourOnSelector, kStylisticAltFourOffSelector }, { 'ss05', kStylisticAlternativesType, kStylisticAltFiveOnSelector, kStylisticAltFiveOffSelector }, { 'ss06', kStylisticAlternativesType, kStylisticAltSixOnSelector, kStylisticAltSixOffSelector }, { 'ss07', kStylisticAlternativesType, kStylisticAltSevenOnSelector, kStylisticAltSevenOffSelector }, { 'ss08', kStylisticAlternativesType, kStylisticAltEightOnSelector, kStylisticAltEightOffSelector }, { 'ss09', kStylisticAlternativesType, kStylisticAltNineOnSelector, kStylisticAltNineOffSelector }, { 'ss10', kStylisticAlternativesType, kStylisticAltTenOnSelector, kStylisticAltTenOffSelector }, { 'ss11', kStylisticAlternativesType, kStylisticAltElevenOnSelector, kStylisticAltElevenOffSelector }, { 'ss12', kStylisticAlternativesType, kStylisticAltTwelveOnSelector, kStylisticAltTwelveOffSelector }, { 'ss13', kStylisticAlternativesType, kStylisticAltThirteenOnSelector, kStylisticAltThirteenOffSelector }, { 'ss14', kStylisticAlternativesType, kStylisticAltFourteenOnSelector, kStylisticAltFourteenOffSelector }, { 'ss15', kStylisticAlternativesType, kStylisticAltFifteenOnSelector, kStylisticAltFifteenOffSelector }, { 'ss16', kStylisticAlternativesType, kStylisticAltSixteenOnSelector, kStylisticAltSixteenOffSelector }, { 'ss17', kStylisticAlternativesType, kStylisticAltSeventeenOnSelector, kStylisticAltSeventeenOffSelector }, { 'ss18', kStylisticAlternativesType, kStylisticAltEighteenOnSelector, kStylisticAltEighteenOffSelector }, { 'ss19', kStylisticAlternativesType, kStylisticAltNineteenOnSelector, kStylisticAltNineteenOffSelector }, { 'ss20', kStylisticAlternativesType, kStylisticAltTwentyOnSelector, kStylisticAltTwentyOffSelector }, { 'subs', kVerticalPositionType, kInferiorsSelector, kNormalPositionSelector }, { 'sups', kVerticalPositionType, kSuperiorsSelector, kNormalPositionSelector }, { 'swsh', kContextualAlternatesType, kSwashAlternatesOnSelector, kSwashAlternatesOffSelector }, { 'titl', kStyleOptionsType, kTitlingCapsSelector, kNoStyleOptionsSelector }, { 'tnam', kCharacterShapeType, kTraditionalNamesCharactersSelector, 16 }, { 'tnum', kNumberSpacingType, kMonospacedNumbersSelector, 4 }, { 'trad', kCharacterShapeType, kTraditionalCharactersSelector, 16 }, { 'twid', kTextSpacingType, kThirdWidthTextSelector, 7 }, { 'unic', kLetterCaseType, 14, 15 }, { 'valt', kTextSpacingType, kAltProportionalTextSelector, 7 }, { 'vert', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector }, { 'vhal', kTextSpacingType, kAltHalfWidthTextSelector, 7 }, { 'vkna', kAlternateKanaType, kAlternateVertKanaOnSelector, kAlternateVertKanaOffSelector }, { 'vpal', kTextSpacingType, kAltProportionalTextSelector, 7 }, { 'vrt2', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector }, { 'zero', kTypographicExtrasType, kSlashedZeroOnSelector, kSlashedZeroOffSelector }, }; static int _hb_feature_mapping_cmp (const void *key_, const void *entry_) { unsigned int key = * (unsigned int *) key_; const feature_mapping_t * entry = (const feature_mapping_t *) entry_; return key < entry->otFeatureTag ? -1 : key > entry->otFeatureTag ? 1 : 0; } hb_bool_t _hb_coretext_shape (hb_shape_plan_t *shape_plan, hb_font_t *font, hb_buffer_t *buffer, const hb_feature_t *features, unsigned int num_features) { hb_face_t *face = font->face; hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); /* Attach marks to their bases, to match the 'ot' shaper. * Adapted from hb-ot-shape:hb_form_clusters(). * Note that this only makes us be closer to the 'ot' shaper, * but by no means the same. For example, if there's * B1 M1 B2 M2, and B1-B2 form a ligature, M2's cluster will * continue pointing to B2 even though B2 was merged into B1's * cluster... */ { hb_unicode_funcs_t *unicode = buffer->unicode; unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 1; i < count; i++) if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (unicode->general_category (info[i].codepoint))) buffer->merge_clusters (i - 1, i + 1); } hb_auto_array_t<feature_record_t> feature_records; hb_auto_array_t<range_record_t> range_records; /* * Set up features. * (copied + modified from code from hb-uniscribe.cc) */ if (num_features) { /* Sort features by start/end events. */ hb_auto_array_t<feature_event_t> feature_events; for (unsigned int i = 0; i < num_features; i++) { const feature_mapping_t * mapping = (const feature_mapping_t *) bsearch (&features[i].tag, feature_mappings, ARRAY_LENGTH (feature_mappings), sizeof (feature_mappings[0]), _hb_feature_mapping_cmp); if (!mapping) continue; active_feature_t feature; feature.rec.feature = mapping->aatFeatureType; feature.rec.setting = features[i].value ? mapping->selectorToEnable : mapping->selectorToDisable; feature.order = i; feature_event_t *event; event = feature_events.push (); if (unlikely (!event)) goto fail_features; event->index = features[i].start; event->start = true; event->feature = feature; event = feature_events.push (); if (unlikely (!event)) goto fail_features; event->index = features[i].end; event->start = false; event->feature = feature; } feature_events.qsort (); /* Add a strategic final event. */ { active_feature_t feature; feature.rec.feature = HB_TAG_NONE; feature.rec.setting = 0; feature.order = num_features + 1; feature_event_t *event = feature_events.push (); if (unlikely (!event)) goto fail_features; event->index = 0; /* This value does magic. */ event->start = false; event->feature = feature; } /* Scan events and save features for each range. */ hb_auto_array_t<active_feature_t> active_features; unsigned int last_index = 0; for (unsigned int i = 0; i < feature_events.len; i++) { feature_event_t *event = &feature_events[i]; if (event->index != last_index) { /* Save a snapshot of active features and the range. */ range_record_t *range = range_records.push (); if (unlikely (!range)) goto fail_features; if (active_features.len) { CFMutableArrayRef features_array = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks); /* TODO sort and resolve conflicting features? */ /* active_features.qsort (); */ for (unsigned int j = 0; j < active_features.len; j++) { CFStringRef keys[2] = { kCTFontFeatureTypeIdentifierKey, kCTFontFeatureSelectorIdentifierKey }; CFNumberRef values[2] = { CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.feature), CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting) }; CFDictionaryRef dict = CFDictionaryCreate (kCFAllocatorDefault, (const void **) keys, (const void **) values, 2, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); CFRelease (values[0]); CFRelease (values[1]); CFArrayAppendValue (features_array, dict); CFRelease (dict); } CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault, (const void **) &kCTFontFeatureSettingsAttribute, (const void **) &features_array, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); CFRelease (features_array); CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes); CFRelease (attributes); range->font = CTFontCreateCopyWithAttributes (font_data->ct_font, 0.0, NULL, font_desc); CFRelease (font_desc); } else { range->font = NULL; } range->index_first = last_index; range->index_last = event->index - 1; last_index = event->index; } if (event->start) { active_feature_t *feature = active_features.push (); if (unlikely (!feature)) goto fail_features; *feature = event->feature; } else { active_feature_t *feature = active_features.find (&event->feature); if (feature) active_features.remove (feature - active_features.array); } } if (!range_records.len) /* No active feature found. */ goto fail_features; } else { fail_features: num_features = 0; } unsigned int scratch_size; hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size); #define ALLOCATE_ARRAY(Type, name, len, on_no_room) \ Type *name = (Type *) scratch; \ { \ unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \ if (unlikely (_consumed > scratch_size)) \ { \ on_no_room; \ assert (0); \ } \ scratch += _consumed; \ scratch_size -= _consumed; \ } ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2, /*nothing*/); unsigned int chars_len = 0; for (unsigned int i = 0; i < buffer->len; i++) { hb_codepoint_t c = buffer->info[i].codepoint; if (likely (c <= 0xFFFFu)) pchars[chars_len++] = c; else if (unlikely (c > 0x10FFFFu)) pchars[chars_len++] = 0xFFFDu; else { pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10); pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1 << 10) - 1)); } } ALLOCATE_ARRAY (unsigned int, log_clusters, chars_len, /*nothing*/); chars_len = 0; for (unsigned int i = 0; i < buffer->len; i++) { hb_codepoint_t c = buffer->info[i].codepoint; unsigned int cluster = buffer->info[i].cluster; log_clusters[chars_len++] = cluster; if (hb_in_range (c, 0x10000u, 0x10FFFFu)) log_clusters[chars_len++] = cluster; /* Surrogates. */ } #define FAIL(...) \ HB_STMT_START { \ DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \ ret = false; \ goto fail; \ } HB_STMT_END; bool ret = true; CFStringRef string_ref = NULL; CTLineRef line = NULL; if (0) { resize_and_retry: DEBUG_MSG (CORETEXT, buffer, "Buffer resize"); /* string_ref uses the scratch-buffer for backing store, and line references * string_ref (via attr_string). We must release those before resizing buffer. */ assert (string_ref); assert (line); CFRelease (string_ref); CFRelease (line); string_ref = NULL; line = NULL; /* Get previous start-of-scratch-area, that we use later for readjusting * our existing scratch arrays. */ unsigned int old_scratch_used; hb_buffer_t::scratch_buffer_t *old_scratch; old_scratch = buffer->get_scratch_buffer (&old_scratch_used); old_scratch_used = scratch - old_scratch; if (unlikely (!buffer->ensure (buffer->allocated * 2))) FAIL ("Buffer resize failed"); /* Adjust scratch, pchars, and log_cluster arrays. This is ugly, but really the * cleanest way to do without completely restructuring the rest of this shaper. */ scratch = buffer->get_scratch_buffer (&scratch_size); pchars = reinterpret_cast<UniChar *> (((char *) scratch + ((char *) pchars - (char *) old_scratch))); log_clusters = reinterpret_cast<unsigned int *> (((char *) scratch + ((char *) log_clusters - (char *) old_scratch))); scratch += old_scratch_used; scratch_size -= old_scratch_used; } retry: { string_ref = CFStringCreateWithCharactersNoCopy (NULL, pchars, chars_len, kCFAllocatorNull); if (unlikely (!string_ref)) FAIL ("CFStringCreateWithCharactersNoCopy failed"); /* Create an attributed string, populate it, and create a line from it, then release attributed string. */ { CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (kCFAllocatorDefault, chars_len); if (unlikely (!attr_string)) FAIL ("CFAttributedStringCreateMutable failed"); CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref); if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction)) { CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len), kCTVerticalFormsAttributeName, kCFBooleanTrue); } if (buffer->props.language) { /* What's the iOS equivalent of this check? * The symbols was introduced in iOS 7.0. * At any rate, our fallback is safe and works fine. */ #if MAC_OS_X_VERSION_MIN_REQUIRED < 1090 # define kCTLanguageAttributeName CFSTR ("NSLanguage") #endif CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault, hb_language_to_string (buffer->props.language), kCFStringEncodingUTF8, kCFAllocatorNull); if (unlikely (!lang)) FAIL ("CFStringCreateWithCStringNoCopy failed"); CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len), kCTLanguageAttributeName, lang); CFRelease (lang); } CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len), kCTFontAttributeName, font_data->ct_font); if (num_features) { unsigned int start = 0; range_record_t *last_range = &range_records[0]; for (unsigned int k = 0; k < chars_len; k++) { range_record_t *range = last_range; while (log_clusters[k] < range->index_first) range--; while (log_clusters[k] > range->index_last) range++; if (range != last_range) { if (last_range->font) CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, k - start), kCTFontAttributeName, last_range->font); start = k; } last_range = range; } if (start != chars_len && last_range->font) CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, chars_len - start), kCTFontAttributeName, last_range->font); } int level = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1; CFNumberRef level_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &level); CFDictionaryRef options = CFDictionaryCreate (kCFAllocatorDefault, (const void **) &kCTTypesetterOptionForcedEmbeddingLevel, (const void **) &level_number, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); if (unlikely (!options)) FAIL ("CFDictionaryCreate failed"); CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions (attr_string, options); CFRelease (options); CFRelease (attr_string); if (unlikely (!typesetter)) FAIL ("CTTypesetterCreateWithAttributedStringAndOptions failed"); line = CTTypesetterCreateLine (typesetter, CFRangeMake(0, 0)); CFRelease (typesetter); if (unlikely (!line)) FAIL ("CTTypesetterCreateLine failed"); } CFArrayRef glyph_runs = CTLineGetGlyphRuns (line); unsigned int num_runs = CFArrayGetCount (glyph_runs); DEBUG_MSG (CORETEXT, NULL, "Num runs: %d", num_runs); buffer->len = 0; uint32_t status_and = ~0, status_or = 0; double advances_so_far = 0; /* For right-to-left runs, CoreText returns the glyphs positioned such that * any trailing whitespace is to the left of (0,0). Adjust coordinate system * to fix for that. Test with any RTL string with trailing spaces. * https://code.google.com/p/chromium/issues/detail?id=469028 */ if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) { advances_so_far -= CTLineGetTrailingWhitespaceWidth (line); if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction)) advances_so_far = -advances_so_far; } const CFRange range_all = CFRangeMake (0, 0); for (unsigned int i = 0; i < num_runs; i++) { CTRunRef run = static_cast<CTRunRef>(CFArrayGetValueAtIndex (glyph_runs, i)); CTRunStatus run_status = CTRunGetStatus (run); status_or |= run_status; status_and &= run_status; DEBUG_MSG (CORETEXT, run, "CTRunStatus: %x", run_status); double run_advance = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL); if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction)) run_advance = -run_advance; DEBUG_MSG (CORETEXT, run, "Run advance: %g", run_advance); /* CoreText does automatic font fallback (AKA "cascading") for characters * not supported by the requested font, and provides no way to turn it off, * so we must detect if the returned run uses a font other than the requested * one and fill in the buffer with .notdef glyphs instead of random glyph * indices from a different font. */ CFDictionaryRef attributes = CTRunGetAttributes (run); CTFontRef run_ct_font = static_cast<CTFontRef>(CFDictionaryGetValue (attributes, kCTFontAttributeName)); if (!CFEqual (run_ct_font, font_data->ct_font)) { /* The run doesn't use our main font instance. We have to figure out * whether font fallback happened, or this is just CoreText giving us * another CTFont using the same underlying CGFont. CoreText seems * to do that in a variety of situations, one of which being vertical * text, but also perhaps for caching reasons. * * First, see if it uses any of our subfonts created to set font features... * * Next, compare the CGFont to the one we used to create our fonts. * Even this doesn't work all the time. * * Finally, we compare PS names, which I don't think are unique... * * Looks like if we really want to be sure here we have to modify the * font to change the name table, similar to what we do in the uniscribe * backend. * * However, even that wouldn't work if we were passed in the CGFont to * begin with. * * Webkit uses a slightly different approach: it installs LastResort * as fallback chain, and then checks PS name of used font against * LastResort. That one is safe for any font except for LastResort, * as opposed to ours, which can fail if we are using any uninstalled * font that has the same name as an installed font. * * See: http://github.com/behdad/harfbuzz/pull/36 */ bool matched = false; for (unsigned int i = 0; i < range_records.len; i++) if (range_records[i].font && CFEqual (run_ct_font, range_records[i].font)) { matched = true; break; } if (!matched) { CGFontRef run_cg_font = CTFontCopyGraphicsFont (run_ct_font, 0); if (run_cg_font) { matched = CFEqual (run_cg_font, face_data); CFRelease (run_cg_font); } } if (!matched) { CFStringRef font_ps_name = CTFontCopyName (font_data->ct_font, kCTFontPostScriptNameKey); CFStringRef run_ps_name = CTFontCopyName (run_ct_font, kCTFontPostScriptNameKey); CFComparisonResult result = CFStringCompare (run_ps_name, font_ps_name, 0); CFRelease (run_ps_name); CFRelease (font_ps_name); if (result == kCFCompareEqualTo) matched = true; } if (!matched) { CFRange range = CTRunGetStringRange (run); DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld", range.location, range.location + range.length); if (!buffer->ensure_inplace (buffer->len + range.length)) goto resize_and_retry; hb_glyph_info_t *info = buffer->info + buffer->len; hb_codepoint_t notdef = 0; hb_direction_t dir = buffer->props.direction; hb_position_t x_advance, y_advance, x_offset, y_offset; hb_font_get_glyph_advance_for_direction (font, notdef, dir, &x_advance, &y_advance); hb_font_get_glyph_origin_for_direction (font, notdef, dir, &x_offset, &y_offset); hb_position_t advance = x_advance + y_advance; x_offset = -x_offset; y_offset = -y_offset; unsigned int old_len = buffer->len; for (CFIndex j = range.location; j < range.location + range.length; j++) { UniChar ch = CFStringGetCharacterAtIndex (string_ref, j); if (hb_in_range<UniChar> (ch, 0xDC00u, 0xDFFFu) && range.location < j) { ch = CFStringGetCharacterAtIndex (string_ref, j - 1); if (hb_in_range<UniChar> (ch, 0xD800u, 0xDBFFu)) /* This is the second of a surrogate pair. Don't need .notdef * for this one. */ continue; } if (buffer->unicode->is_default_ignorable (ch)) continue; info->codepoint = notdef; info->cluster = log_clusters[j]; info->mask = advance; info->var1.i32 = x_offset; info->var2.i32 = y_offset; info++; buffer->len++; } if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) buffer->reverse_range (old_len, buffer->len); advances_so_far += run_advance; continue; } } unsigned int num_glyphs = CTRunGetGlyphCount (run); if (num_glyphs == 0) continue; if (!buffer->ensure_inplace (buffer->len + num_glyphs)) goto resize_and_retry; hb_glyph_info_t *run_info = buffer->info + buffer->len; /* Testing used to indicate that CTRunGetGlyphsPtr, etc (almost?) always * succeed, and so copying data to our own buffer will be rare. Reports * have it that this changed in OS X 10.10 Yosemite, and NULL is returned * frequently. At any rate, we can test that codepath by setting USE_PTR * to false. */ #define USE_PTR true #define SCRATCH_SAVE() \ unsigned int scratch_size_saved = scratch_size; \ hb_buffer_t::scratch_buffer_t *scratch_saved = scratch #define SCRATCH_RESTORE() \ scratch_size = scratch_size_saved; \ scratch = scratch_saved; { /* Setup glyphs */ SCRATCH_SAVE(); const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : NULL; if (!glyphs) { ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry); CTRunGetGlyphs (run, range_all, glyph_buf); glyphs = glyph_buf; } const CFIndex* string_indices = USE_PTR ? CTRunGetStringIndicesPtr (run) : NULL; if (!string_indices) { ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs, goto resize_and_retry); CTRunGetStringIndices (run, range_all, index_buf); string_indices = index_buf; } hb_glyph_info_t *info = run_info; for (unsigned int j = 0; j < num_glyphs; j++) { info->codepoint = glyphs[j]; info->cluster = log_clusters[string_indices[j]]; info++; } SCRATCH_RESTORE(); } { /* Setup positions. * Note that CoreText does not return advances for glyphs. As such, * for all but last glyph, we use the delta position to next glyph as * advance (in the advance direction only), and for last glyph we set * whatever is needed to make the whole run's advance add up. */ SCRATCH_SAVE(); const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : NULL; if (!positions) { ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry); CTRunGetPositions (run, range_all, position_buf); positions = position_buf; } hb_glyph_info_t *info = run_info; CGFloat x_mult = font_data->x_mult, y_mult = font_data->y_mult; if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction)) { hb_position_t x_offset = (positions[0].x - advances_so_far) * x_mult; for (unsigned int j = 0; j < num_glyphs; j++) { double advance; if (likely (j + 1 < num_glyphs)) advance = positions[j + 1].x - positions[j].x; else /* last glyph */ advance = run_advance - (positions[j].x - positions[0].x); info->mask = advance * x_mult; info->var1.i32 = x_offset; info->var2.i32 = positions[j].y * y_mult; info++; } } else { hb_position_t y_offset = (positions[0].y - advances_so_far) * y_mult; for (unsigned int j = 0; j < num_glyphs; j++) { double advance; if (likely (j + 1 < num_glyphs)) advance = positions[j + 1].y - positions[j].y; else /* last glyph */ advance = run_advance - (positions[j].y - positions[0].y); info->mask = advance * y_mult; info->var1.i32 = positions[j].x * x_mult; info->var2.i32 = y_offset; info++; } } SCRATCH_RESTORE(); advances_so_far += run_advance; } #undef SCRATCH_RESTORE #undef SCRATCH_SAVE #undef USE_PTR #undef ALLOCATE_ARRAY buffer->len += num_glyphs; } /* Mac OS 10.6 doesn't have kCTTypesetterOptionForcedEmbeddingLevel, * or if it does, it doesn't resepct it. So we get runs with wrong * directions. As such, disable the assert... It wouldn't crash, but * cursoring will be off... * * http://crbug.com/419769 */ if (0) { /* Make sure all runs had the expected direction. */ bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction); assert (bool (status_and & kCTRunStatusRightToLeft) == backward); assert (bool (status_or & kCTRunStatusRightToLeft) == backward); } buffer->clear_positions (); unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; hb_glyph_position_t *pos = buffer->pos; if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction)) for (unsigned int i = 0; i < count; i++) { pos->x_advance = info->mask; pos->x_offset = info->var1.i32; pos->y_offset = info->var2.i32; info++, pos++; } else for (unsigned int i = 0; i < count; i++) { pos->y_advance = info->mask; pos->x_offset = info->var1.i32; pos->y_offset = info->var2.i32; info++, pos++; } /* Fix up clusters so that we never return out-of-order indices; * if core text has reordered glyphs, we'll merge them to the * beginning of the reordered cluster. CoreText is nice enough * to tell us whenever it has produced nonmonotonic results... * Note that we assume the input clusters were nonmonotonic to * begin with. * * This does *not* mean we'll form the same clusters as Uniscribe * or the native OT backend, only that the cluster indices will be * monotonic in the output buffer. */ if (count > 1 && (status_or & kCTRunStatusNonMonotonic)) { hb_glyph_info_t *info = buffer->info; if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) { unsigned int cluster = info[count - 1].cluster; for (unsigned int i = count - 1; i > 0; i--) { cluster = MIN (cluster, info[i - 1].cluster); info[i - 1].cluster = cluster; } } else { unsigned int cluster = info[0].cluster; for (unsigned int i = 1; i < count; i++) { cluster = MIN (cluster, info[i].cluster); info[i].cluster = cluster; } } } } #undef FAIL fail: if (string_ref) CFRelease (string_ref); if (line) CFRelease (line); for (unsigned int i = 0; i < range_records.len; i++) if (range_records[i].font) CFRelease (range_records[i].font); return ret; } /* * AAT shaper */ HB_SHAPER_DATA_ENSURE_DECLARE(coretext_aat, face) HB_SHAPER_DATA_ENSURE_DECLARE(coretext_aat, font) /* * shaper face data */ struct hb_coretext_aat_shaper_face_data_t {}; hb_coretext_aat_shaper_face_data_t * _hb_coretext_aat_shaper_face_data_create (hb_face_t *face) { hb_blob_t *mort_blob = face->reference_table (HB_CORETEXT_TAG_MORT); /* Umm, we just reference the table to check whether it exists. * Maybe add better API for this? */ if (!hb_blob_get_length (mort_blob)) { hb_blob_destroy (mort_blob); mort_blob = face->reference_table (HB_CORETEXT_TAG_MORX); if (!hb_blob_get_length (mort_blob)) { hb_blob_destroy (mort_blob); return NULL; } } hb_blob_destroy (mort_blob); return hb_coretext_shaper_face_data_ensure (face) ? (hb_coretext_aat_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED : NULL; } void _hb_coretext_aat_shaper_face_data_destroy (hb_coretext_aat_shaper_face_data_t *data HB_UNUSED) { } /* * shaper font data */ struct hb_coretext_aat_shaper_font_data_t {}; hb_coretext_aat_shaper_font_data_t * _hb_coretext_aat_shaper_font_data_create (hb_font_t *font) { return hb_coretext_shaper_font_data_ensure (font) ? (hb_coretext_aat_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED : NULL; } void _hb_coretext_aat_shaper_font_data_destroy (hb_coretext_aat_shaper_font_data_t *data HB_UNUSED) { } /* * shaper shape_plan data */ struct hb_coretext_aat_shaper_shape_plan_data_t {}; hb_coretext_aat_shaper_shape_plan_data_t * _hb_coretext_aat_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, const hb_feature_t *user_features HB_UNUSED, unsigned int num_user_features HB_UNUSED) { return (hb_coretext_aat_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; } void _hb_coretext_aat_shaper_shape_plan_data_destroy (hb_coretext_aat_shaper_shape_plan_data_t *data HB_UNUSED) { } /* * shaper */ hb_bool_t _hb_coretext_aat_shape (hb_shape_plan_t *shape_plan, hb_font_t *font, hb_buffer_t *buffer, const hb_feature_t *features, unsigned int num_features) { return _hb_coretext_shape (shape_plan, font, buffer, features, num_features); }