diff options
Diffstat (limited to 'gfx/harfbuzz/src/hb-coretext.cc')
| -rw-r--r-- | gfx/harfbuzz/src/hb-coretext.cc | 1310 |
1 files changed, 1310 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-coretext.cc b/gfx/harfbuzz/src/hb-coretext.cc new file mode 100644 index 000000000..e857dfae0 --- /dev/null +++ b/gfx/harfbuzz/src/hb-coretext.cc @@ -0,0 +1,1310 @@ +/* + * 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 + + +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 CTFontDescriptorRef +get_last_resort_font_desc (void) +{ + // TODO Handle allocation failures? + CTFontDescriptorRef last_resort = CTFontDescriptorCreateWithNameAndSize (CFSTR("LastResort"), 0); + CFArrayRef cascade_list = CFArrayCreate (kCFAllocatorDefault, + (const void **) &last_resort, + 1, + &kCFTypeArrayCallBacks); + CFRelease (last_resort); + CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault, + (const void **) &kCTFontCascadeListAttribute, + (const void **) &cascade_list, + 1, + &kCFTypeDictionaryKeyCallBacks, + &kCFTypeDictionaryValueCallBacks); + CFRelease (cascade_list); + + CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes); + CFRelease (attributes); + return font_desc; +} + +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); +} + +static CGFontRef +create_cg_font (hb_face_t *face) +{ + CGFontRef cg_font = NULL; + if (face->destroy == (hb_destroy_func_t) CGFontRelease) + { + cg_font = 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)) + { + cg_font = CGFontCreateWithDataProvider (provider); + if (unlikely (!cg_font)) + DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed"); + CGDataProviderRelease (provider); + } + } + return cg_font; +} + +static CTFontRef +create_ct_font (CGFontRef cg_font, CGFloat font_size) +{ + CTFontRef ct_font = CTFontCreateWithGraphicsFont (cg_font, font_size, NULL, NULL); + if (unlikely (!ct_font)) { + DEBUG_MSG (CORETEXT, cg_font, "Font CTFontCreateWithGraphicsFont() failed"); + return NULL; + } + + /* crbug.com/576941 and crbug.com/625902 and the investigation in the latter + * bug indicate that the cascade list reconfiguration occasionally causes + * crashes in CoreText on OS X 10.9, thus let's skip this step on older + * operating system versions. Except for the emoji font, where _not_ + * reconfiguring the cascade list causes CoreText crashes. For details, see + * crbug.com/549610 */ + // 0x00070000 stands for "kCTVersionNumber10_10", see CoreText.h + if (&CTGetCoreTextVersion != NULL && CTGetCoreTextVersion() < 0x00070000) { + CFStringRef fontName = CTFontCopyPostScriptName (ct_font); + bool isEmojiFont = CFStringCompare (fontName, CFSTR("AppleColorEmoji"), 0) == kCFCompareEqualTo; + CFRelease (fontName); + if (!isEmojiFont) + return ct_font; + } + + CFURLRef original_url = (CFURLRef)CTFontCopyAttribute(ct_font, kCTFontURLAttribute); + + /* Create font copy with cascade list that has LastResort first; this speeds up CoreText + * font fallback which we don't need anyway. */ + { + CTFontDescriptorRef last_resort_font_desc = get_last_resort_font_desc (); + CTFontRef new_ct_font = CTFontCreateCopyWithAttributes (ct_font, 0.0, NULL, last_resort_font_desc); + CFRelease (last_resort_font_desc); + if (new_ct_font) + { + /* The CTFontCreateCopyWithAttributes call fails to stay on the same font + * when reconfiguring the cascade list and may switch to a different font + * when there are fonts that go by the same name, since the descriptor is + * just name and size. + * + * Avoid reconfiguring the cascade lists if the new font is outside the + * system locations that we cannot access from the sandboxed renderer + * process in Blink. This can be detected by the new file URL location + * that the newly found font points to. */ + CFURLRef new_url = (CFURLRef) CTFontCopyAttribute (new_ct_font, kCTFontURLAttribute); + // Keep reconfigured font if URL cannot be retrieved (seems to be the case + // on Mac OS 10.12 Sierra), speculative fix for crbug.com/625606 + if (!original_url || !new_url || CFEqual (original_url, new_url)) { + CFRelease (ct_font); + ct_font = new_ct_font; + } else { + CFRelease (new_ct_font); + DEBUG_MSG (CORETEXT, ct_font, "Discarding reconfigured CTFont, location changed."); + } + if (new_url) + CFRelease (new_url); + } + else + DEBUG_MSG (CORETEXT, ct_font, "Font copy with empty cascade list failed"); + } + + if (original_url) + CFRelease (original_url); + return ct_font; +} + +struct hb_coretext_shaper_face_data_t { + CGFontRef cg_font; + CTFontRef ct_font; +}; + +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; + + data->cg_font = create_cg_font (face); + if (unlikely (!data->cg_font)) + { + DEBUG_MSG (CORETEXT, face, "CGFont creation failed.."); + free (data); + return NULL; + } + + /* We use 36pt size instead of UPEM, because CoreText implements the 'trak' table, + * which can make the font too tight at large sizes. 36pt should be a good semi-neutral + * size. + * + * Since we always create CTFont at a fixed size, our CTFont lives in face_data + * instead of font_data. Which is good, because when people change scale on + * hb_font_t, we won't need to update our CTFont. */ + data->ct_font = create_ct_font (data->cg_font, 36.); + if (unlikely (!data->ct_font)) + { + DEBUG_MSG (CORETEXT, face, "CTFont creation failed."); + CFRelease (data->cg_font); + free (data); + return NULL; + } + + return data; +} + +void +_hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data) +{ + CFRelease (data->ct_font); + CFRelease (data->cg_font); + free (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->cg_font; +} + + +/* + * shaper font data + */ + +struct hb_coretext_shaper_font_data_t {}; + +hb_coretext_shaper_font_data_t * +_hb_coretext_shaper_font_data_create (hb_font_t *font HB_UNUSED) +{ + return (hb_coretext_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED; +} + +void +_hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *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, + const int *coords HB_UNUSED, + unsigned int num_coords 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) +{ + hb_face_t *face = font->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->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); + + CGFloat ct_font_size = CTFontGetSize (face_data->ct_font); + CGFloat x_mult = (CGFloat) font->x_scale / ct_font_size; + CGFloat y_mult = (CGFloat) font->y_scale / ct_font_size; + + /* 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... */ + if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES) + { + 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 (face_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) & ((1u << 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; + } + { + 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, face_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, face_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 + * construct a hb_face to begin with. + * + * See: http://github.com/behdad/harfbuzz/pull/36 + * + * Also see: https://bugs.chromium.org/p/chromium/issues/detail?id=597098 + */ + 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->cg_font); + CFRelease (run_cg_font); + } + } + if (!matched) + { + CFStringRef font_ps_name = CTFontCopyName (face_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; + 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 + */ + +/* + * 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, + const int *coords HB_UNUSED, + unsigned int num_coords 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); +} |