hb-coretext.cc 33.6 KB
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/*
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 * Copyright © 2012,2013  Mozilla Foundation.
 * Copyright © 2012,2013  Google, Inc.
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 *
 *  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
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 * Google Author(s): Behdad Esfahbod
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 */

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#define HB_SHAPER coretext
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#include "hb-shaper-impl-private.hh"
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#include "hb-coretext.h"


#ifndef HB_DEBUG_CORETEXT
#define HB_DEBUG_CORETEXT (HB_DEBUG+0)
#endif


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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);
}


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HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face)
HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font)
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/*
 * shaper face data
 */

struct hb_coretext_shaper_face_data_t {
  CGFontRef cg_font;
};
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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);
}

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hb_coretext_shaper_face_data_t *
_hb_coretext_shaper_face_data_create (hb_face_t *face)
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{
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  hb_coretext_shaper_face_data_t *data = (hb_coretext_shaper_face_data_t *) calloc (1, sizeof (hb_coretext_shaper_face_data_t));
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  if (unlikely (!data))
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    return NULL;
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  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);
  }
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  if (unlikely (!data->cg_font)) {
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    DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
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    free (data);
    return NULL;
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  }

  return data;
}

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void
_hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data)
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{
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  CFRelease (data->cg_font);
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  free (data);
}

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CGFontRef
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hb_coretext_face_get_cg_font (hb_face_t *face)
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{
  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;
}

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/*
 * 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)
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{
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  if (unlikely (!hb_coretext_shaper_face_data_ensure (font->face))) return NULL;
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  hb_coretext_shaper_font_data_t *data = (hb_coretext_shaper_font_data_t *) calloc (1, sizeof (hb_coretext_shaper_font_data_t));
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  if (unlikely (!data))
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    return NULL;
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  hb_face_t *face = font->face;
  hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
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  data->ct_font = CTFontCreateWithGraphicsFont (face_data->cg_font, font->y_scale, NULL, NULL);
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  if (unlikely (!data->ct_font)) {
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    DEBUG_MSG (CORETEXT, font, "Font CTFontCreateWithGraphicsFont() failed");
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    free (data);
    return NULL;
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  }

  return data;
}

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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 *
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_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)
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{
  return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}

void
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_hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED)
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{
}

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CTFontRef
hb_coretext_font_get_ct_font (hb_font_t *font)
{
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  if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return NULL;
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  hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
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  return font_data->ct_font;
}

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/*
 * shaper
 */

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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;
}

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hb_bool_t
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_hb_coretext_shape (hb_shape_plan_t    *shape_plan,
		    hb_font_t          *font,
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                    hb_buffer_t        *buffer,
                    const hb_feature_t *features,
                    unsigned int        num_features)
{
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  hb_face_t *face = font->face;
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  hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
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  hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
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  /*
   * 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;

	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;
  }

587 588 589 590 591 592 593
#define FAIL(...) \
  HB_STMT_START { \
    DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \
    return false; \
  } HB_STMT_END;

  unsigned int scratch_size;
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  hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
595 596 597 598 599 600 601 602 603

#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; \
  }
604 605 606

#define utf16_index() var1.u32

607 608
  ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2);

609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624
  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

625
  CFStringRef string_ref = CFStringCreateWithCharactersNoCopy (NULL,
626 627 628
                                                               pchars, chars_len,
                                                               kCFAllocatorNull);

629 630 631 632 633
  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);

634
  if (num_features)
635
  {
636
    ALLOCATE_ARRAY (unsigned int, log_clusters, chars_len);
637

638 639 640
    /* Need log_clusters to assign features. */
    chars_len = 0;
    for (unsigned int i = 0; i < buffer->len; i++)
641
    {
642 643 644 645 646
      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. */
647
    }
648

649 650 651
    unsigned int start = 0;
    range_record_t *last_range = &range_records[0];
    for (unsigned int k = 0; k < chars_len; k++)
652
    {
653 654 655 656 657 658 659 660 661 662 663 664 665 666 667
      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;
668
    }
669 670 671 672 673 674 675
    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);
676
  }
677 678 679 680 681 682 683 684 685 686 687

  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);

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  for (unsigned int i = 0; i < num_runs; i++)
  {
690 691
    CTRunRef run = (CTRunRef) CFArrayGetValueAtIndex (glyph_runs, i);

692 693 694 695 696 697 698 699 700
    /* 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);
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    if (!CFEqual (run_cg_font, face_data->cg_font))
    {
703
        CFRelease (run_cg_font);
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	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;

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	CGGlyph notdef = 0;
	double advance = CTFontGetAdvancesForGlyphs (font_data->ct_font, kCTFontHorizontalOrientation, &notdef, NULL, 1);

714
        for (CFIndex j = range.location; j < range.location + range.length; j++)
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	{
716 717 718 719 720 721 722 723 724 725
	    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;
	    }

726
            info->codepoint = notdef;
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	    /* TODO We have to fixup clusters later.  See vis_clusters in
	     * hb-uniscribe.cc for example. */
729
            info->cluster = j;
730 731 732 733 734

            info->mask = advance;
            info->var1.u32 = 0;
            info->var2.u32 = 0;

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	    info++;
736
	    buffer->len++;
737 738 739 740 741
        }
        continue;
    }
    CFRelease (run_cg_font);

742 743 744 745 746 747
    unsigned int num_glyphs = CTRunGetGlyphCount (run);
    if (num_glyphs == 0)
      continue;

    buffer->ensure (buffer->len + num_glyphs);

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    scratch = buffer->get_scratch_buffer (&scratch_size);
749

750 751
    /* Testing indicates that CTRunGetGlyphsPtr, etc (almost?) always
     * succeed, and so copying data to our own buffer will be rare. */
752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785

    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];

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      /* Currently, we do all x-positioning by setting the advance, we never use x-offset. */
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
      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;
  }

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  /* 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. */
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844
  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;
    }
  }

845
  CFRelease (string_ref);
846 847
  CFRelease (line);

848 849
  return true;
}
850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943


/*
 * 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);
}