kc3-lang/harfbuzz/src/hb-coretext.cc

• Show log

  Commit

• Hash : a9e25e90
  Author :
  Date : 2014-03-14T19:55:46
  

  [coretext] Add hb_coretext_face_create()
  
  Not tested.
  

Download

• src/hb-coretext.cc

• /*
   * Copyright © 2012,2013  Mozilla Foundation.
   * Copyright © 2012,2013  Google, Inc.
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Mozilla Author(s): Jonathan Kew
   * Google Author(s): Behdad Esfahbod
   */
  
  #define HB_SHAPER coretext
  #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
   */
  
  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;
  
    if (face->destroy == (hb_destroy_func_t) CGFontRelease)
    {
      data->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);
      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_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,
  						       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;
    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;
  }
  
  
  /*
   * AAT shaper
   */
  
  HB_SHAPER_DATA_ENSURE_DECLARE(coretext_aat, face)
  HB_SHAPER_DATA_ENSURE_DECLARE(coretext_aat, font)
  
  
  /*
   * shaper face data
   */
  
  struct hb_coretext_aat_shaper_face_data_t {};
  
  hb_coretext_aat_shaper_face_data_t *
  _hb_coretext_aat_shaper_face_data_create (hb_face_t *face)
  {
    hb_blob_t *mort_blob = face->reference_table (HB_CORETEXT_TAG_MORT);
    /* Umm, we just reference the table to check whether it exists.
     * Maybe add better API for this? */
    if (!hb_blob_get_length (mort_blob))
    {
      hb_blob_destroy (mort_blob);
      mort_blob = face->reference_table (HB_CORETEXT_TAG_MORX);
      if (!hb_blob_get_length (mort_blob))
      {
        hb_blob_destroy (mort_blob);
        return NULL;
      }
    }
    hb_blob_destroy (mort_blob);
  
    return hb_coretext_shaper_face_data_ensure (face) ? (hb_coretext_aat_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED : NULL;
  }
  
  void
  _hb_coretext_aat_shaper_face_data_destroy (hb_coretext_aat_shaper_face_data_t *data HB_UNUSED)
  {
  }
  
  
  /*
   * shaper font data
   */
  
  struct hb_coretext_aat_shaper_font_data_t {};
  
  hb_coretext_aat_shaper_font_data_t *
  _hb_coretext_aat_shaper_font_data_create (hb_font_t *font)
  {
    return hb_coretext_shaper_font_data_ensure (font) ? (hb_coretext_aat_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED : NULL;
  }
  
  void
  _hb_coretext_aat_shaper_font_data_destroy (hb_coretext_aat_shaper_font_data_t *data HB_UNUSED)
  {
  }
  
  
  /*
   * shaper shape_plan data
   */
  
  struct hb_coretext_aat_shaper_shape_plan_data_t {};
  
  hb_coretext_aat_shaper_shape_plan_data_t *
  _hb_coretext_aat_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan HB_UNUSED,
  					     const hb_feature_t *user_features HB_UNUSED,
  					     unsigned int        num_user_features HB_UNUSED)
  {
    return (hb_coretext_aat_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
  }
  
  void
  _hb_coretext_aat_shaper_shape_plan_data_destroy (hb_coretext_aat_shaper_shape_plan_data_t *data HB_UNUSED)
  {
  }
  
  
  /*
   * shaper
   */
  
  hb_bool_t
  _hb_coretext_aat_shape (hb_shape_plan_t    *shape_plan,
  			hb_font_t          *font,
  			hb_buffer_t        *buffer,
  			const hb_feature_t *features,
  			unsigned int        num_features)
  {
    return _hb_coretext_shape (shape_plan, font, buffer, features, num_features);
  }
  

Download