The Tor Browser: gfx/harfbuzz/src/hb-coretext.cc@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-coretext.cc@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-coretext.cc

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /*
  * 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 :
 ;
   }
   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 :
 ;
 }
 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);
   /*
    * 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,
 ,
 						       &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,
 ,
 							   &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;
   hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
 #define ALLOCATE_ARRAY(Type, name, len) \
   Type *name = (Type *) scratch; \
   { \
     unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
     assert (_consumed <= scratch_size); \
     scratch += _consumed; \
     scratch_size -= _consumed; \
   }
 #define utf16_index() var1.u32
   ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2);
   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);
   CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
 				  kCTFontAttributeName, font_data->ct_font);
   if (num_features)
   {
     ALLOCATE_ARRAY (unsigned int, log_clusters, 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);
     /* 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 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));
     CGFontRef run_cg_font = CTFontCopyGraphicsFont (run_ct_font, 0);
     if (!CFEqual (run_cg_font, face_data->cg_font))
     {
         CFRelease (run_cg_font);
 	CFRange range = CTRunGetStringRange (run);
 	buffer->ensure (buffer->len + range.length);
 	if (buffer->in_error)
 	  FAIL ("Buffer resize failed");
 	hb_glyph_info_t *info = buffer->info + buffer->len;
 	CGGlyph notdef = 0;
 	double advance = CTFontGetAdvancesForGlyphs (font_data->ct_font, kCTFontHorizontalOrientation, &notdef, NULL, 1);
         for (CFIndex j = range.location; j < range.location + range.length; j++)
 	{
 	    UniChar ch = CFStringGetCharacterAtIndex (string_ref, j);
 	    if (hb_in_range<UniChar> (ch, 0xDC00, 0xDFFF) && range.location < j)
 	    {
 	      ch = CFStringGetCharacterAtIndex (string_ref, j - 1);
 	      if (hb_in_range<UniChar> (ch, 0xD800, 0xDBFF))
 	        /* This is the second of a surrogate pair.  Don't need .notdef
 		 * for this one. */
 	        continue;
 	    }
             info->codepoint = notdef;
 	    /* TODO We have to fixup clusters later.  See vis_clusters in
 	     * hb-uniscribe.cc for example. */
             info->cluster = j;
             info->mask = advance;
             info->var1.u32 = 0;
             info->var2.u32 = 0;
 	    info++;
 	    buffer->len++;
         }
         continue;
     }
     CFRelease (run_cg_font);
     unsigned int num_glyphs = CTRunGetGlyphCount (run);
     if (num_glyphs == 0)
       continue;
     buffer->ensure (buffer->len + num_glyphs);
     scratch = buffer->get_scratch_buffer (&scratch_size);
     /* Testing indicates that CTRunGetGlyphsPtr, etc (almost?) always
      * succeed, and so copying data to our own buffer will be rare. */
     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 (string_ref);
   CFRelease (line);
   return true;
 }

The Tor Browser / annotate

gfx/harfbuzz/src/hb-coretext.cc@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-coretext.cc