diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-coretext.cc')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-coretext.cc | 757 |
1 files changed, 757 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-coretext.cc b/Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-coretext.cc new file mode 100644 index 00000000000..f780973565b --- /dev/null +++ b/Build/source/libs/harfbuzz/harfbuzz-0.9.20/src/hb-coretext.cc @@ -0,0 +1,757 @@ +/* + * 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 +#include "hb-shaper-impl-private.hh" + +#include "hb-coretext.h" + + +#ifndef HB_DEBUG_CORETEXT +#define HB_DEBUG_CORETEXT (HB_DEBUG+0) +#endif + + +HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face) +HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font) + + +/* + * shaper face data + */ + +struct hb_coretext_shaper_face_data_t { + CGFontRef cg_font; +}; + +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 = (hb_coretext_shaper_face_data_t *) calloc (1, sizeof (hb_coretext_shaper_face_data_t)); + if (unlikely (!data)) + return NULL; + + 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); + data->cg_font = CGFontCreateWithDataProvider (provider); + CGDataProviderRelease (provider); + + if (unlikely (!data->cg_font)) { + DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed"); + free (data); + return NULL; + } + + return data; +} + +void +_hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data) +{ + CFRelease (data->cg_font); + free (data); +} + +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->cg_font; +} + + +/* + * shaper font data + */ + +struct hb_coretext_shaper_font_data_t { + CTFontRef ct_font; +}; + +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); + + data->ct_font = CTFontCreateWithGraphicsFont (face_data->cg_font, font->y_scale, 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. */ +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_font_data_t *font_data = HB_SHAPER_DATA_GET (font); + + /* + * Set up features. + * (copied + modified from code from hb-uniscribe.cc) + */ + hb_auto_array_t<feature_record_t> feature_records; + hb_auto_array_t<range_record_t> range_records; + 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.sort (); + /* 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; + + unsigned int offset = feature_records.len; + + if (active_features.len) + { + CFMutableArrayRef features_array = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks); + + /* TODO sort and resolve conflicting features? */ + /* active_features.sort (); */ + 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; + } + +#define FAIL(...) \ + HB_STMT_START { \ + DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \ + return false; \ + } HB_STMT_END; + + unsigned int scratch_size; + char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size); + +#define utf16_index() var1.u32 + + UniChar *pchars = (UniChar *) scratch; + unsigned int chars_len = 0; + for (unsigned int i = 0; i < buffer->len; i++) { + hb_codepoint_t c = buffer->info[i].codepoint; + buffer->info[i].utf16_index() = chars_len; + if (likely (c < 0x10000)) + pchars[chars_len++] = c; + else if (unlikely (c >= 0x110000)) + pchars[chars_len++] = 0xFFFD; + else { + pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10); + pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1)); + } + } + +#undef utf16_index + + CFStringRef string_ref = CFStringCreateWithCharactersNoCopy (NULL, + pchars, chars_len, + kCFAllocatorNull); + + CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (NULL, chars_len); + CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref); + CFRelease (string_ref); + CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len), + kCTFontAttributeName, font_data->ct_font); + + if (num_features) + { + unsigned int *log_clusters = (unsigned int *) (pchars + chars_len); + + /* Need log_clusters to assign features. */ + 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 (c >= 0x10000 && c < 0x110000) + log_clusters[chars_len++] = cluster; /* Surrogates. */ + } + + 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 - 1), + kCTFontAttributeName, last_range->font); + + for (unsigned int i = 0; i < range_records.len; i++) + if (range_records[i].font) + CFRelease (range_records[i].font); + } + + CTLineRef line = CTLineCreateWithAttributedString (attr_string); + CFRelease (attr_string); + + CFArrayRef glyph_runs = CTLineGetGlyphRuns (line); + unsigned int num_runs = CFArrayGetCount (glyph_runs); + + buffer->len = 0; + + const CFRange range_all = CFRangeMake (0, 0); + + for (unsigned int i = 0; i < num_runs; i++) { + CTRunRef run = (CTRunRef) CFArrayGetValueAtIndex (glyph_runs, i); + + unsigned int num_glyphs = CTRunGetGlyphCount (run); + if (num_glyphs == 0) + continue; + + buffer->ensure (buffer->len + num_glyphs); + + /* Testing indicates that CTRunGetGlyphsPtr (almost?) always succeeds, + * and so copying data to our own buffer with CTRunGetGlyphs will be + * extremely rare. */ + + unsigned int scratch_size; + char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size); + +#define ALLOCATE_ARRAY(Type, name, len) \ + Type *name = (Type *) scratch; \ + scratch += (len) * sizeof ((name)[0]); \ + scratch_size -= (len) * sizeof ((name)[0]); + + const CGGlyph* glyphs = CTRunGetGlyphsPtr (run); + if (!glyphs) { + ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs); + CTRunGetGlyphs (run, range_all, glyph_buf); + glyphs = glyph_buf; + } + + const CGPoint* positions = CTRunGetPositionsPtr (run); + if (!positions) { + ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs); + CTRunGetPositions (run, range_all, position_buf); + positions = position_buf; + } + + const CFIndex* string_indices = CTRunGetStringIndicesPtr (run); + if (!string_indices) { + ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs); + CTRunGetStringIndices (run, range_all, index_buf); + string_indices = index_buf; + } + +#undef ALLOCATE_ARRAY + + double run_width = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL); + + for (unsigned int j = 0; j < num_glyphs; j++) { + double advance = (j + 1 < num_glyphs ? positions[j + 1].x : positions[0].x + run_width) - positions[j].x; + + hb_glyph_info_t *info = &buffer->info[buffer->len]; + + info->codepoint = glyphs[j]; + info->cluster = string_indices[j]; + + /* Currently, we do all x-positioning by setting the advance, we never use x-offset. */ + info->mask = advance; + info->var1.u32 = 0; + info->var2.u32 = positions[j].y; + + buffer->len++; + } + } + + buffer->clear_positions (); + + unsigned int count = buffer->len; + for (unsigned int i = 0; i < count; ++i) { + hb_glyph_info_t *info = &buffer->info[i]; + hb_glyph_position_t *pos = &buffer->pos[i]; + + /* TODO vertical */ + pos->x_advance = info->mask; + pos->x_offset = info->var1.u32; + pos->y_offset = info->var2.u32; + } + + /* 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. + * + * 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 (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) { + unsigned int prev_cluster = 0; + for (unsigned int i = 0; i < count; i++) { + unsigned int curr_cluster = buffer->info[i].cluster; + if (curr_cluster < prev_cluster) { + for (unsigned int j = i; j > 0; j--) { + if (buffer->info[j - 1].cluster > curr_cluster) + buffer->info[j - 1].cluster = curr_cluster; + else + break; + } + } + prev_cluster = curr_cluster; + } + } else { + unsigned int prev_cluster = (unsigned int)-1; + for (unsigned int i = 0; i < count; i++) { + unsigned int curr_cluster = buffer->info[i].cluster; + if (curr_cluster > prev_cluster) { + for (unsigned int j = i; j > 0; j--) { + if (buffer->info[j - 1].cluster < curr_cluster) + buffer->info[j - 1].cluster = curr_cluster; + else + break; + } + } + prev_cluster = curr_cluster; + } + } + + CFRelease (line); + + return true; +} |