1 /*

     2  * Copyright © 2012,2013  Mozilla Foundation.

     3  * Copyright © 2012,2013  Google, Inc.

     4  *

     5  *  This is part of HarfBuzz, a text shaping library.

     6  *

     7  * Permission is hereby granted, without written agreement and without

     8  * license or royalty fees, to use, copy, modify, and distribute this

     9  * software and its documentation for any purpose, provided that the

    10  * above copyright notice and the following two paragraphs appear in

    11  * all copies of this software.

    12  *

    13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR

    14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES

    15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN

    16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

    17  * DAMAGE.

    18  *

    19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,

    20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

    21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS

    22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO

    23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

    24  *

    25  * Mozilla Author(s): Jonathan Kew

    26  * Google Author(s): Behdad Esfahbod

    27  */

    28 

    29 #define HB_SHAPER coretext

    30 #define hb_coretext_shaper_face_data_t CGFont

    31 #include "hb-shaper-impl-private.hh"

    32 

    33 #include "hb-coretext.h"

    34 

    35 

    36 #ifndef HB_DEBUG_CORETEXT

    37 #define HB_DEBUG_CORETEXT (HB_DEBUG+0)

    38 #endif

    39 

    40 

    41 static void

    42 release_table_data (void *user_data)

    43 {

    44   CFDataRef cf_data = reinterpret_cast<CFDataRef> (user_data);

    45   CFRelease(cf_data);

    46 }

    47 

    48 static hb_blob_t *

    49 reference_table  (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)

    50 {

    51   CGFontRef cg_font = reinterpret_cast<CGFontRef> (user_data);

    52   CFDataRef cf_data = CGFontCopyTableForTag (cg_font, tag);

    53   if (unlikely (!cf_data))

    54     return NULL;

    55 

    56   const char *data = reinterpret_cast<const char*> (CFDataGetBytePtr (cf_data));

    57   const size_t length = CFDataGetLength (cf_data);

    58   if (!data || !length)

    59     return NULL;

    60 

    61   return hb_blob_create (data, length, HB_MEMORY_MODE_READONLY,

    62                          reinterpret_cast<void *> (const_cast<__CFData *> (cf_data)),

    63                          release_table_data);

    64 }

    65 

    66 hb_face_t *

    67 hb_coretext_face_create (CGFontRef cg_font)

    68 {

    69   return hb_face_create_for_tables (reference_table, CGFontRetain (cg_font), (hb_destroy_func_t) CGFontRelease);

    70 }

    71 

    72 

    73 HB_SHAPER_DATA_ENSURE_DECLARE(coretext, face)

    74 HB_SHAPER_DATA_ENSURE_DECLARE(coretext, font)

    75 

    76 

    77 /*

    78  * shaper face data

    79  */

    80 

    81 static void

    82 release_data (void *info, const void *data, size_t size)

    83 {

    84   assert (hb_blob_get_length ((hb_blob_t *) info) == size &&

    85           hb_blob_get_data ((hb_blob_t *) info, NULL) == data);

    86 

    87   hb_blob_destroy ((hb_blob_t *) info);

    88 }

    89 

    90 hb_coretext_shaper_face_data_t *

    91 _hb_coretext_shaper_face_data_create (hb_face_t *face)

    92 {

    93   hb_coretext_shaper_face_data_t *data = NULL;

    94 

    95   if (face->destroy == (hb_destroy_func_t) CGFontRelease)

    96   {

    97     data = CGFontRetain ((CGFontRef) face->user_data);

    98   }

    99   else

   100   {

   101     hb_blob_t *blob = hb_face_reference_blob (face);

   102     unsigned int blob_length;

   103     const char *blob_data = hb_blob_get_data (blob, &blob_length);

   104     if (unlikely (!blob_length))

   105       DEBUG_MSG (CORETEXT, face, "Face has empty blob");

   106 

   107     CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data);

   108     if (likely (provider))

   109     {

   110       data = CGFontCreateWithDataProvider (provider);

   111       CGDataProviderRelease (provider);

   112     }

   113   }

   114 

   115   if (unlikely (!data)) {

   116     DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");

   117   }

   118 

   119   return data;

   120 }

   121 

   122 void

   123 _hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data)

   124 {

   125   CFRelease (data);

   126 }

   127 

   128 /*

   129  * Since: 0.9.10

   130  */

   131 CGFontRef

   132 hb_coretext_face_get_cg_font (hb_face_t *face)

   133 {

   134   if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return NULL;

   135   hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);

   136   return face_data;

   137 }

   138 

   139 

   140 /*

   141  * shaper font data

   142  */

   143 

   144 struct hb_coretext_shaper_font_data_t {

   145   CTFontRef ct_font;

   146   CGFloat x_mult, y_mult; /* From CT space to HB space. */

   147 };

   148 

   149 hb_coretext_shaper_font_data_t *

   150 _hb_coretext_shaper_font_data_create (hb_font_t *font)

   151 {

   152   if (unlikely (!hb_coretext_shaper_face_data_ensure (font->face))) return NULL;

   153 

   154   hb_coretext_shaper_font_data_t *data = (hb_coretext_shaper_font_data_t *) calloc (1, sizeof (hb_coretext_shaper_font_data_t));

   155   if (unlikely (!data))

   156     return NULL;

   157 

   158   hb_face_t *face = font->face;

   159   hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);

   160 

   161   /* Choose a CoreText font size and calculate multipliers to convert to HarfBuzz space. */

   162   /* TODO: use upem instead of 36? */

   163   CGFloat font_size = 36.; /* Default... */

   164   /* No idea if the following is even a good idea. */

   165   if (font->y_ppem)

   166     font_size = font->y_ppem;

   167 

   168   if (font_size < 0)

   169     font_size = -font_size;

   170   data->x_mult = (CGFloat) font->x_scale / font_size;

   171   data->y_mult = (CGFloat) font->y_scale / font_size;

   172   data->ct_font = CTFontCreateWithGraphicsFont (face_data, font_size, NULL, NULL);

   173   if (unlikely (!data->ct_font)) {

   174     DEBUG_MSG (CORETEXT, font, "Font CTFontCreateWithGraphicsFont() failed");

   175     free (data);

   176     return NULL;

   177   }

   178 

   179   return data;

   180 }

   181 

   182 void

   183 _hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data)

   184 {

   185   CFRelease (data->ct_font);

   186   free (data);

   187 }

   188 

   189 

   190 /*

   191  * shaper shape_plan data

   192  */

   193 

   194 struct hb_coretext_shaper_shape_plan_data_t {};

   195 

   196 hb_coretext_shaper_shape_plan_data_t *

   197 _hb_coretext_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan HB_UNUSED,

   198                                              const hb_feature_t *user_features HB_UNUSED,

   199                                              unsigned int        num_user_features HB_UNUSED)

   200 {

   201   return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;

   202 }

   203 

   204 void

   205 _hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED)

   206 {

   207 }

   208 

   209 CTFontRef

   210 hb_coretext_font_get_ct_font (hb_font_t *font)

   211 {

   212   if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return NULL;

   213   hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);

   214   return font_data->ct_font;

   215 }

   216 

   217 

   218 /*

   219  * shaper

   220  */

   221 

   222 struct feature_record_t {

   223   unsigned int feature;

   224   unsigned int setting;

   225 };

   226 

   227 struct active_feature_t {

   228   feature_record_t rec;

   229   unsigned int order;

   230 

   231   static int cmp (const active_feature_t *a, const active_feature_t *b) {

   232     return a->rec.feature < b->rec.feature ? -1 : a->rec.feature > b->rec.feature ? 1 :

   233            a->order < b->order ? -1 : a->order > b->order ? 1 :

   234            a->rec.setting < b->rec.setting ? -1 : a->rec.setting > b->rec.setting ? 1 :

   235            0;

   236   }

   237   bool operator== (const active_feature_t *f) {

   238     return cmp (this, f) == 0;

   239   }

   240 };

   241 

   242 struct feature_event_t {

   243   unsigned int index;

   244   bool start;

   245   active_feature_t feature;

   246 

   247   static int cmp (const feature_event_t *a, const feature_event_t *b) {

   248     return a->index < b->index ? -1 : a->index > b->index ? 1 :

   249            a->start < b->start ? -1 : a->start > b->start ? 1 :

   250            active_feature_t::cmp (&a->feature, &b->feature);

   251   }

   252 };

   253 

   254 struct range_record_t {

   255   CTFontRef font;

   256   unsigned int index_first; /* == start */

   257   unsigned int index_last;  /* == end - 1 */

   258 };

   259 

   260 

   261 /* The following enum members are added in OS X 10.8. */

   262 #define kAltHalfWidthTextSelector               6

   263 #define kAltProportionalTextSelector            5

   264 #define kAlternateHorizKanaOffSelector          1

   265 #define kAlternateHorizKanaOnSelector           0

   266 #define kAlternateKanaType                      34

   267 #define kAlternateVertKanaOffSelector           3

   268 #define kAlternateVertKanaOnSelector            2

   269 #define kCaseSensitiveLayoutOffSelector         1

   270 #define kCaseSensitiveLayoutOnSelector          0

   271 #define kCaseSensitiveLayoutType                33

   272 #define kCaseSensitiveSpacingOffSelector        3

   273 #define kCaseSensitiveSpacingOnSelector         2

   274 #define kContextualAlternatesOffSelector        1

   275 #define kContextualAlternatesOnSelector         0

   276 #define kContextualAlternatesType               36

   277 #define kContextualLigaturesOffSelector         19

   278 #define kContextualLigaturesOnSelector          18

   279 #define kContextualSwashAlternatesOffSelector   5

   280 #define kContextualSwashAlternatesOnSelector    4

   281 #define kDefaultLowerCaseSelector               0

   282 #define kDefaultUpperCaseSelector               0

   283 #define kHistoricalLigaturesOffSelector         21

   284 #define kHistoricalLigaturesOnSelector          20

   285 #define kHojoCharactersSelector                 12

   286 #define kJIS2004CharactersSelector              11

   287 #define kLowerCasePetiteCapsSelector            2

   288 #define kLowerCaseSmallCapsSelector             1

   289 #define kLowerCaseType                          37

   290 #define kMathematicalGreekOffSelector           11

   291 #define kMathematicalGreekOnSelector            10

   292 #define kNLCCharactersSelector                  13

   293 #define kQuarterWidthTextSelector               4

   294 #define kScientificInferiorsSelector            4

   295 #define kStylisticAltEightOffSelector           17

   296 #define kStylisticAltEightOnSelector            16

   297 #define kStylisticAltEighteenOffSelector        37

   298 #define kStylisticAltEighteenOnSelector         36

   299 #define kStylisticAltElevenOffSelector          23

   300 #define kStylisticAltElevenOnSelector           22

   301 #define kStylisticAltFifteenOffSelector         31

   302 #define kStylisticAltFifteenOnSelector          30

   303 #define kStylisticAltFiveOffSelector            11

   304 #define kStylisticAltFiveOnSelector             10

   305 #define kStylisticAltFourOffSelector            9

   306 #define kStylisticAltFourOnSelector             8

   307 #define kStylisticAltFourteenOffSelector        29

   308 #define kStylisticAltFourteenOnSelector         28

   309 #define kStylisticAltNineOffSelector            19

   310 #define kStylisticAltNineOnSelector             18

   311 #define kStylisticAltNineteenOffSelector        39

   312 #define kStylisticAltNineteenOnSelector         38

   313 #define kStylisticAltOneOffSelector             3

   314 #define kStylisticAltOneOnSelector              2

   315 #define kStylisticAltSevenOffSelector           15

   316 #define kStylisticAltSevenOnSelector            14

   317 #define kStylisticAltSeventeenOffSelector       35

   318 #define kStylisticAltSeventeenOnSelector        34

   319 #define kStylisticAltSixOffSelector             13

   320 #define kStylisticAltSixOnSelector              12

   321 #define kStylisticAltSixteenOffSelector         33

   322 #define kStylisticAltSixteenOnSelector          32

   323 #define kStylisticAltTenOffSelector             21

   324 #define kStylisticAltTenOnSelector              20

   325 #define kStylisticAltThirteenOffSelector        27

   326 #define kStylisticAltThirteenOnSelector         26

   327 #define kStylisticAltThreeOffSelector           7

   328 #define kStylisticAltThreeOnSelector            6

   329 #define kStylisticAltTwelveOffSelector          25

   330 #define kStylisticAltTwelveOnSelector           24

   331 #define kStylisticAltTwentyOffSelector          41

   332 #define kStylisticAltTwentyOnSelector           40

   333 #define kStylisticAltTwoOffSelector             5

   334 #define kStylisticAltTwoOnSelector              4

   335 #define kStylisticAlternativesType              35

   336 #define kSwashAlternatesOffSelector             3

   337 #define kSwashAlternatesOnSelector              2

   338 #define kThirdWidthTextSelector                 3

   339 #define kTraditionalNamesCharactersSelector     14

   340 #define kUpperCasePetiteCapsSelector            2

   341 #define kUpperCaseSmallCapsSelector             1

   342 #define kUpperCaseType                          38

   343 

   344 /* Table data courtesy of Apple. */

   345 static const struct feature_mapping_t {

   346     FourCharCode otFeatureTag;

   347     uint16_t aatFeatureType;

   348     uint16_t selectorToEnable;

   349     uint16_t selectorToDisable;

   350 } feature_mappings[] = {

   351     { 'c2pc',   kUpperCaseType,             kUpperCasePetiteCapsSelector,           kDefaultUpperCaseSelector },

   352     { 'c2sc',   kUpperCaseType,             kUpperCaseSmallCapsSelector,            kDefaultUpperCaseSelector },

   353     { 'calt',   kContextualAlternatesType,  kContextualAlternatesOnSelector,        kContextualAlternatesOffSelector },

   354     { 'case',   kCaseSensitiveLayoutType,   kCaseSensitiveLayoutOnSelector,         kCaseSensitiveLayoutOffSelector },

   355     { 'clig',   kLigaturesType,             kContextualLigaturesOnSelector,         kContextualLigaturesOffSelector },

   356     { 'cpsp',   kCaseSensitiveLayoutType,   kCaseSensitiveSpacingOnSelector,        kCaseSensitiveSpacingOffSelector },

   357     { 'cswh',   kContextualAlternatesType,  kContextualSwashAlternatesOnSelector,   kContextualSwashAlternatesOffSelector },

   358     { 'dlig',   kLigaturesType,             kRareLigaturesOnSelector,               kRareLigaturesOffSelector },

   359     { 'expt',   kCharacterShapeType,        kExpertCharactersSelector,              16 },

   360     { 'frac',   kFractionsType,             kDiagonalFractionsSelector,             kNoFractionsSelector },

   361     { 'fwid',   kTextSpacingType,           kMonospacedTextSelector,                7 },

   362     { 'halt',   kTextSpacingType,           kAltHalfWidthTextSelector,              7 },

   363     { 'hist',   kLigaturesType,             kHistoricalLigaturesOnSelector,         kHistoricalLigaturesOffSelector },

   364     { 'hkna',   kAlternateKanaType,         kAlternateHorizKanaOnSelector,          kAlternateHorizKanaOffSelector, },

   365     { 'hlig',   kLigaturesType,             kHistoricalLigaturesOnSelector,         kHistoricalLigaturesOffSelector },

   366     { 'hngl',   kTransliterationType,       kHanjaToHangulSelector,                 kNoTransliterationSelector },

   367     { 'hojo',   kCharacterShapeType,        kHojoCharactersSelector,                16 },

   368     { 'hwid',   kTextSpacingType,           kHalfWidthTextSelector,                 7 },

   369     { 'ital',   kItalicCJKRomanType,        kCJKItalicRomanOnSelector,              kCJKItalicRomanOffSelector },

   370     { 'jp04',   kCharacterShapeType,        kJIS2004CharactersSelector,             16 },

   371     { 'jp78',   kCharacterShapeType,        kJIS1978CharactersSelector,             16 },

   372     { 'jp83',   kCharacterShapeType,        kJIS1983CharactersSelector,             16 },

   373     { 'jp90',   kCharacterShapeType,        kJIS1990CharactersSelector,             16 },

   374     { 'liga',   kLigaturesType,             kCommonLigaturesOnSelector,             kCommonLigaturesOffSelector },

   375     { 'lnum',   kNumberCaseType,            kUpperCaseNumbersSelector,              2 },

   376     { 'mgrk',   kMathematicalExtrasType,    kMathematicalGreekOnSelector,           kMathematicalGreekOffSelector },

   377     { 'nlck',   kCharacterShapeType,        kNLCCharactersSelector,                 16 },

   378     { 'onum',   kNumberCaseType,            kLowerCaseNumbersSelector,              2 },

   379     { 'ordn',   kVerticalPositionType,      kOrdinalsSelector,                      kNormalPositionSelector },

   380     { 'palt',   kTextSpacingType,           kAltProportionalTextSelector,           7 },

   381     { 'pcap',   kLowerCaseType,             kLowerCasePetiteCapsSelector,           kDefaultLowerCaseSelector },

   382     { 'pkna',   kTextSpacingType,           kProportionalTextSelector,              7 },

   383     { 'pnum',   kNumberSpacingType,         kProportionalNumbersSelector,           4 },

   384     { 'pwid',   kTextSpacingType,           kProportionalTextSelector,              7 },

   385     { 'qwid',   kTextSpacingType,           kQuarterWidthTextSelector,              7 },

   386     { 'ruby',   kRubyKanaType,              kRubyKanaOnSelector,                    kRubyKanaOffSelector },

   387     { 'sinf',   kVerticalPositionType,      kScientificInferiorsSelector,           kNormalPositionSelector },

   388     { 'smcp',   kLowerCaseType,             kLowerCaseSmallCapsSelector,            kDefaultLowerCaseSelector },

   389     { 'smpl',   kCharacterShapeType,        kSimplifiedCharactersSelector,          16 },

   390     { 'ss01',   kStylisticAlternativesType, kStylisticAltOneOnSelector,             kStylisticAltOneOffSelector },

   391     { 'ss02',   kStylisticAlternativesType, kStylisticAltTwoOnSelector,             kStylisticAltTwoOffSelector },

   392     { 'ss03',   kStylisticAlternativesType, kStylisticAltThreeOnSelector,           kStylisticAltThreeOffSelector },

   393     { 'ss04',   kStylisticAlternativesType, kStylisticAltFourOnSelector,            kStylisticAltFourOffSelector },

   394     { 'ss05',   kStylisticAlternativesType, kStylisticAltFiveOnSelector,            kStylisticAltFiveOffSelector },

   395     { 'ss06',   kStylisticAlternativesType, kStylisticAltSixOnSelector,             kStylisticAltSixOffSelector },

   396     { 'ss07',   kStylisticAlternativesType, kStylisticAltSevenOnSelector,           kStylisticAltSevenOffSelector },

   397     { 'ss08',   kStylisticAlternativesType, kStylisticAltEightOnSelector,           kStylisticAltEightOffSelector },

   398     { 'ss09',   kStylisticAlternativesType, kStylisticAltNineOnSelector,            kStylisticAltNineOffSelector },

   399     { 'ss10',   kStylisticAlternativesType, kStylisticAltTenOnSelector,             kStylisticAltTenOffSelector },

   400     { 'ss11',   kStylisticAlternativesType, kStylisticAltElevenOnSelector,          kStylisticAltElevenOffSelector },

   401     { 'ss12',   kStylisticAlternativesType, kStylisticAltTwelveOnSelector,          kStylisticAltTwelveOffSelector },

   402     { 'ss13',   kStylisticAlternativesType, kStylisticAltThirteenOnSelector,        kStylisticAltThirteenOffSelector },

   403     { 'ss14',   kStylisticAlternativesType, kStylisticAltFourteenOnSelector,        kStylisticAltFourteenOffSelector },

   404     { 'ss15',   kStylisticAlternativesType, kStylisticAltFifteenOnSelector,         kStylisticAltFifteenOffSelector },

   405     { 'ss16',   kStylisticAlternativesType, kStylisticAltSixteenOnSelector,         kStylisticAltSixteenOffSelector },

   406     { 'ss17',   kStylisticAlternativesType, kStylisticAltSeventeenOnSelector,       kStylisticAltSeventeenOffSelector },

   407     { 'ss18',   kStylisticAlternativesType, kStylisticAltEighteenOnSelector,        kStylisticAltEighteenOffSelector },

   408     { 'ss19',   kStylisticAlternativesType, kStylisticAltNineteenOnSelector,        kStylisticAltNineteenOffSelector },

   409     { 'ss20',   kStylisticAlternativesType, kStylisticAltTwentyOnSelector,          kStylisticAltTwentyOffSelector },

   410     { 'subs',   kVerticalPositionType,      kInferiorsSelector,                     kNormalPositionSelector },

   411     { 'sups',   kVerticalPositionType,      kSuperiorsSelector,                     kNormalPositionSelector },

   412     { 'swsh',   kContextualAlternatesType,  kSwashAlternatesOnSelector,             kSwashAlternatesOffSelector },

   413     { 'titl',   kStyleOptionsType,          kTitlingCapsSelector,                   kNoStyleOptionsSelector },

   414     { 'tnam',   kCharacterShapeType,        kTraditionalNamesCharactersSelector,    16 },

   415     { 'tnum',   kNumberSpacingType,         kMonospacedNumbersSelector,             4 },

   416     { 'trad',   kCharacterShapeType,        kTraditionalCharactersSelector,         16 },

   417     { 'twid',   kTextSpacingType,           kThirdWidthTextSelector,                7 },

   418     { 'unic',   kLetterCaseType,            14,                                     15 },

   419     { 'valt',   kTextSpacingType,           kAltProportionalTextSelector,           7 },

   420     { 'vert',   kVerticalSubstitutionType,  kSubstituteVerticalFormsOnSelector,     kSubstituteVerticalFormsOffSelector },

   421     { 'vhal',   kTextSpacingType,           kAltHalfWidthTextSelector,              7 },

   422     { 'vkna',   kAlternateKanaType,         kAlternateVertKanaOnSelector,           kAlternateVertKanaOffSelector },

   423     { 'vpal',   kTextSpacingType,           kAltProportionalTextSelector,           7 },

   424     { 'vrt2',   kVerticalSubstitutionType,  kSubstituteVerticalFormsOnSelector,     kSubstituteVerticalFormsOffSelector },

   425     { 'zero',   kTypographicExtrasType,     kSlashedZeroOnSelector,                 kSlashedZeroOffSelector },

   426 };

   427 

   428 static int

   429 _hb_feature_mapping_cmp (const void *key_, const void *entry_)

   430 {

   431   unsigned int key = * (unsigned int *) key_;

   432   const feature_mapping_t * entry = (const feature_mapping_t *) entry_;

   433   return key < entry->otFeatureTag ? -1 :

   434          key > entry->otFeatureTag ? 1 :

   435          0;

   436 }

   437 

   438 hb_bool_t

   439 _hb_coretext_shape (hb_shape_plan_t    *shape_plan,

   440                     hb_font_t          *font,

   441                     hb_buffer_t        *buffer,

   442                     const hb_feature_t *features,

   443                     unsigned int        num_features)

   444 {

   445   hb_face_t *face = font->face;

   446   hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);

   447   hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);

   448 

   449   /* Attach marks to their bases, to match the 'ot' shaper.

   450    * Adapted from hb-ot-shape:hb_form_clusters().

   451    * Note that this only makes us be closer to the 'ot' shaper,

   452    * but by no means the same.  For example, if there's

   453    * B1 M1 B2 M2, and B1-B2 form a ligature, M2's cluster will

   454    * continue pointing to B2 even though B2 was merged into B1's

   455    * cluster... */

   456   {

   457     hb_unicode_funcs_t *unicode = buffer->unicode;

   458     unsigned int count = buffer->len;

   459     hb_glyph_info_t *info = buffer->info;

   460     for (unsigned int i = 1; i < count; i++)

   461       if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (unicode->general_category (info[i].codepoint)))

   462         buffer->merge_clusters (i - 1, i + 1);

   463   }

   464 

   465   hb_auto_array_t<feature_record_t> feature_records;

   466   hb_auto_array_t<range_record_t> range_records;

   467 

   468   /*

   469    * Set up features.

   470    * (copied + modified from code from hb-uniscribe.cc)

   471    */

   472   if (num_features)

   473   {

   474     /* Sort features by start/end events. */

   475     hb_auto_array_t<feature_event_t> feature_events;

   476     for (unsigned int i = 0; i < num_features; i++)

   477     {

   478       const feature_mapping_t * mapping = (const feature_mapping_t *) bsearch (&features[i].tag,

   479                                                                                feature_mappings,

   480                                                                                ARRAY_LENGTH (feature_mappings),

   481                                                                                sizeof (feature_mappings[0]),

   482                                                                                _hb_feature_mapping_cmp);

   483       if (!mapping)

   484         continue;

   485 

   486       active_feature_t feature;

   487       feature.rec.feature = mapping->aatFeatureType;

   488       feature.rec.setting = features[i].value ? mapping->selectorToEnable : mapping->selectorToDisable;

   489       feature.order = i;

   490 

   491       feature_event_t *event;

   492 

   493       event = feature_events.push ();

   494       if (unlikely (!event))

   495         goto fail_features;

   496       event->index = features[i].start;

   497       event->start = true;

   498       event->feature = feature;

   499 

   500       event = feature_events.push ();

   501       if (unlikely (!event))

   502         goto fail_features;

   503       event->index = features[i].end;

   504       event->start = false;

   505       event->feature = feature;

   506     }

   507     feature_events.qsort ();

   508     /* Add a strategic final event. */

   509     {

   510       active_feature_t feature;

   511       feature.rec.feature = HB_TAG_NONE;

   512       feature.rec.setting = 0;

   513       feature.order = num_features + 1;

   514 

   515       feature_event_t *event = feature_events.push ();

   516       if (unlikely (!event))

   517         goto fail_features;

   518       event->index = 0; /* This value does magic. */

   519       event->start = false;

   520       event->feature = feature;

   521     }

   522 

   523     /* Scan events and save features for each range. */

   524     hb_auto_array_t<active_feature_t> active_features;

   525     unsigned int last_index = 0;

   526     for (unsigned int i = 0; i < feature_events.len; i++)

   527     {

   528       feature_event_t *event = &feature_events[i];

   529 

   530       if (event->index != last_index)

   531       {

   532         /* Save a snapshot of active features and the range. */

   533         range_record_t *range = range_records.push ();

   534         if (unlikely (!range))

   535           goto fail_features;

   536 

   537         if (active_features.len)

   538         {

   539           CFMutableArrayRef features_array = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);

   540 

   541           /* TODO sort and resolve conflicting features? */

   542           /* active_features.qsort (); */

   543           for (unsigned int j = 0; j < active_features.len; j++)

   544           {

   545             CFStringRef keys[2] = {

   546               kCTFontFeatureTypeIdentifierKey,

   547               kCTFontFeatureSelectorIdentifierKey

   548             };

   549             CFNumberRef values[2] = {

   550               CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.feature),

   551               CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting)

   552             };

   553             CFDictionaryRef dict = CFDictionaryCreate (kCFAllocatorDefault,

   554                                                        (const void **) keys,

   555                                                        (const void **) values,

   556                                                        2,

   557                                                        &kCFTypeDictionaryKeyCallBacks,

   558                                                        &kCFTypeDictionaryValueCallBacks);

   559             CFRelease (values[0]);

   560             CFRelease (values[1]);

   561 

   562             CFArrayAppendValue (features_array, dict);

   563             CFRelease (dict);

   564 

   565           }

   566 

   567           CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,

   568                                                            (const void **) &kCTFontFeatureSettingsAttribute,

   569                                                            (const void **) &features_array,

   570                                                            1,

   571                                                            &kCFTypeDictionaryKeyCallBacks,

   572                                                            &kCFTypeDictionaryValueCallBacks);

   573           CFRelease (features_array);

   574 

   575           CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);

   576           CFRelease (attributes);

   577 

   578           range->font = CTFontCreateCopyWithAttributes (font_data->ct_font, 0.0, NULL, font_desc);

   579           CFRelease (font_desc);

   580         }

   581         else

   582         {

   583           range->font = NULL;

   584         }

   585 

   586         range->index_first = last_index;

   587         range->index_last  = event->index - 1;

   588 

   589         last_index = event->index;

   590       }

   591 

   592       if (event->start) {

   593         active_feature_t *feature = active_features.push ();

   594         if (unlikely (!feature))

   595           goto fail_features;

   596         *feature = event->feature;

   597       } else {

   598         active_feature_t *feature = active_features.find (&event->feature);

   599         if (feature)

   600           active_features.remove (feature - active_features.array);

   601       }

   602     }

   603 

   604     if (!range_records.len) /* No active feature found. */

   605       goto fail_features;

   606   }

   607   else

   608   {

   609   fail_features:

   610     num_features = 0;

   611   }

   612 

   613   unsigned int scratch_size;

   614   hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);

   615 

   616 #define ALLOCATE_ARRAY(Type, name, len, on_no_room) \

   617   Type *name = (Type *) scratch; \

   618   { \

   619     unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \

   620     if (unlikely (_consumed > scratch_size)) \

   621     { \

   622       on_no_room; \

   623       assert (0); \

   624     } \

   625     scratch += _consumed; \

   626     scratch_size -= _consumed; \

   627   }

   628 

   629   ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2, /*nothing*/);

   630   unsigned int chars_len = 0;

   631   for (unsigned int i = 0; i < buffer->len; i++) {

   632     hb_codepoint_t c = buffer->info[i].codepoint;

   633     if (likely (c <= 0xFFFFu))

   634       pchars[chars_len++] = c;

   635     else if (unlikely (c > 0x10FFFFu))

   636       pchars[chars_len++] = 0xFFFDu;

   637     else {

   638       pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10);

   639       pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1 << 10) - 1));

   640     }

   641   }

   642 

   643   ALLOCATE_ARRAY (unsigned int, log_clusters, chars_len, /*nothing*/);

   644   chars_len = 0;

   645   for (unsigned int i = 0; i < buffer->len; i++)

   646   {

   647     hb_codepoint_t c = buffer->info[i].codepoint;

   648     unsigned int cluster = buffer->info[i].cluster;

   649     log_clusters[chars_len++] = cluster;

   650     if (hb_in_range (c, 0x10000u, 0x10FFFFu))

   651       log_clusters[chars_len++] = cluster; /* Surrogates. */

   652   }

   653 

   654 #define FAIL(...) \

   655   HB_STMT_START { \

   656     DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \

   657     ret = false; \

   658     goto fail; \

   659   } HB_STMT_END;

   660 

   661   bool ret = true;

   662   CFStringRef string_ref = NULL;

   663   CTLineRef line = NULL;

   664 

   665   if (0)

   666   {

   667 resize_and_retry:

   668     DEBUG_MSG (CORETEXT, buffer, "Buffer resize");

   669     /* string_ref uses the scratch-buffer for backing store, and line references

   670      * string_ref (via attr_string).  We must release those before resizing buffer. */

   671     assert (string_ref);

   672     assert (line);

   673     CFRelease (string_ref);

   674     CFRelease (line);

   675     string_ref = NULL;

   676     line = NULL;

   677 

   678     /* Get previous start-of-scratch-area, that we use later for readjusting

   679      * our existing scratch arrays. */

   680     unsigned int old_scratch_used;

   681     hb_buffer_t::scratch_buffer_t *old_scratch;

   682     old_scratch = buffer->get_scratch_buffer (&old_scratch_used);

   683     old_scratch_used = scratch - old_scratch;

   684 

   685     if (unlikely (!buffer->ensure (buffer->allocated * 2)))

   686       FAIL ("Buffer resize failed");

   687 

   688     /* Adjust scratch, pchars, and log_cluster arrays.  This is ugly, but really the

   689      * cleanest way to do without completely restructuring the rest of this shaper. */

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

   691     pchars = reinterpret_cast<UniChar *> (((char *) scratch + ((char *) pchars - (char *) old_scratch)));

   692     log_clusters = reinterpret_cast<unsigned int *> (((char *) scratch + ((char *) log_clusters - (char *) old_scratch)));

   693     scratch += old_scratch_used;

   694     scratch_size -= old_scratch_used;

   695   }

   696 retry:

   697   {

   698     string_ref = CFStringCreateWithCharactersNoCopy (NULL,

   699                                                      pchars, chars_len,

   700                                                      kCFAllocatorNull);

   701     if (unlikely (!string_ref))

   702       FAIL ("CFStringCreateWithCharactersNoCopy failed");

   703 

   704     /* Create an attributed string, populate it, and create a line from it, then release attributed string. */

   705     {

   706       CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (kCFAllocatorDefault,

   707                                                                                   chars_len);

   708       if (unlikely (!attr_string))

   709         FAIL ("CFAttributedStringCreateMutable failed");

   710       CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref);

   711       if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))

   712       {

   713         CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),

   714                                         kCTVerticalFormsAttributeName, kCFBooleanTrue);

   715       }

   716 

   717       if (buffer->props.language)

   718       {

   719 /* What's the iOS equivalent of this check?

   720  * The symbols was introduced in iOS 7.0.

   721  * At any rate, our fallback is safe and works fine. */

   722 #if MAC_OS_X_VERSION_MIN_REQUIRED < 1090

   723 #  define kCTLanguageAttributeName CFSTR ("NSLanguage")

   724 #endif

   725         CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault,

   726                                                             hb_language_to_string (buffer->props.language),

   727                                                             kCFStringEncodingUTF8,

   728                                                             kCFAllocatorNull);

   729         if (unlikely (!lang))

   730           FAIL ("CFStringCreateWithCStringNoCopy failed");

   731         CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),

   732                                         kCTLanguageAttributeName, lang);

   733         CFRelease (lang);

   734       }

   735       CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),

   736                                       kCTFontAttributeName, font_data->ct_font);

   737 

   738       if (num_features)

   739       {

   740         unsigned int start = 0;

   741         range_record_t *last_range = &range_records[0];

   742         for (unsigned int k = 0; k < chars_len; k++)

   743         {

   744           range_record_t *range = last_range;

   745           while (log_clusters[k] < range->index_first)

   746             range--;

   747           while (log_clusters[k] > range->index_last)

   748             range++;

   749           if (range != last_range)

   750           {

   751             if (last_range->font)

   752               CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, k - start),

   753                                               kCTFontAttributeName, last_range->font);

   754 

   755             start = k;

   756           }

   757 

   758           last_range = range;

   759         }

   760         if (start != chars_len && last_range->font)

   761           CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, chars_len - start),

   762                                           kCTFontAttributeName, last_range->font);

   763       }

   764 

   765       int level = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;

   766       CFNumberRef level_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &level);

   767       CFDictionaryRef options = CFDictionaryCreate (kCFAllocatorDefault,

   768                                                     (const void **) &kCTTypesetterOptionForcedEmbeddingLevel,

   769                                                     (const void **) &level_number,

   770                                                     1,

   771                                                     &kCFTypeDictionaryKeyCallBacks,

   772                                                     &kCFTypeDictionaryValueCallBacks);

   773       if (unlikely (!options))

   774         FAIL ("CFDictionaryCreate failed");

   775 

   776       CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions (attr_string, options);

   777       CFRelease (options);

   778       CFRelease (attr_string);

   779       if (unlikely (!typesetter))

   780         FAIL ("CTTypesetterCreateWithAttributedStringAndOptions failed");

   781 

   782       line = CTTypesetterCreateLine (typesetter, CFRangeMake(0, 0));

   783       CFRelease (typesetter);

   784       if (unlikely (!line))

   785         FAIL ("CTTypesetterCreateLine failed");

   786     }

   787 

   788     CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);

   789     unsigned int num_runs = CFArrayGetCount (glyph_runs);

   790     DEBUG_MSG (CORETEXT, NULL, "Num runs: %d", num_runs);

   791 

   792     buffer->len = 0;

   793     uint32_t status_and = ~0, status_or = 0;

   794     double advances_so_far = 0;

   795     /* For right-to-left runs, CoreText returns the glyphs positioned such that

   796      * any trailing whitespace is to the left of (0,0).  Adjust coordinate system

   797      * to fix for that.  Test with any RTL string with trailing spaces.

   798      * https://code.google.com/p/chromium/issues/detail?id=469028

   799      */

   800     if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))

   801     {

   802       advances_so_far -= CTLineGetTrailingWhitespaceWidth (line);

   803       if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))

   804           advances_so_far = -advances_so_far;

   805     }

   806 

   807     const CFRange range_all = CFRangeMake (0, 0);

   808 

   809     for (unsigned int i = 0; i < num_runs; i++)

   810     {

   811       CTRunRef run = static_cast<CTRunRef>(CFArrayGetValueAtIndex (glyph_runs, i));

   812       CTRunStatus run_status = CTRunGetStatus (run);

   813       status_or  |= run_status;

   814       status_and &= run_status;

   815       DEBUG_MSG (CORETEXT, run, "CTRunStatus: %x", run_status);

   816       double run_advance = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL);

   817       if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))

   818           run_advance = -run_advance;

   819       DEBUG_MSG (CORETEXT, run, "Run advance: %g", run_advance);

   820 

   821       /* CoreText does automatic font fallback (AKA "cascading") for  characters

   822        * not supported by the requested font, and provides no way to turn it off,

   823        * so we must detect if the returned run uses a font other than the requested

   824        * one and fill in the buffer with .notdef glyphs instead of random glyph

   825        * indices from a different font.

   826        */

   827       CFDictionaryRef attributes = CTRunGetAttributes (run);

   828       CTFontRef run_ct_font = static_cast<CTFontRef>(CFDictionaryGetValue (attributes, kCTFontAttributeName));

   829       if (!CFEqual (run_ct_font, font_data->ct_font))

   830       {

   831         /* The run doesn't use our main font instance.  We have to figure out

   832          * whether font fallback happened, or this is just CoreText giving us

   833          * another CTFont using the same underlying CGFont.  CoreText seems

   834          * to do that in a variety of situations, one of which being vertical

   835          * text, but also perhaps for caching reasons.

   836          *

   837          * First, see if it uses any of our subfonts created to set font features...

   838          *

   839          * Next, compare the CGFont to the one we used to create our fonts.

   840          * Even this doesn't work all the time.

   841          *

   842          * Finally, we compare PS names, which I don't think are unique...

   843          *

   844          * Looks like if we really want to be sure here we have to modify the

   845          * font to change the name table, similar to what we do in the uniscribe

   846          * backend.

   847          *

   848          * However, even that wouldn't work if we were passed in the CGFont to

   849          * begin with.

   850          *

   851          * Webkit uses a slightly different approach: it installs LastResort

   852          * as fallback chain, and then checks PS name of used font against

   853          * LastResort.  That one is safe for any font except for LastResort,

   854          * as opposed to ours, which can fail if we are using any uninstalled

   855          * font that has the same name as an installed font.

   856          *

   857          * See: http://github.com/behdad/harfbuzz/pull/36

   858          */

   859         bool matched = false;

   860         for (unsigned int i = 0; i < range_records.len; i++)

   861           if (range_records[i].font && CFEqual (run_ct_font, range_records[i].font))

   862           {

   863             matched = true;

   864             break;

   865           }

   866         if (!matched)

   867         {

   868           CGFontRef run_cg_font = CTFontCopyGraphicsFont (run_ct_font, 0);

   869           if (run_cg_font)

   870           {

   871             matched = CFEqual (run_cg_font, face_data);

   872             CFRelease (run_cg_font);

   873           }

   874         }

   875         if (!matched)

   876         {

   877           CFStringRef font_ps_name = CTFontCopyName (font_data->ct_font, kCTFontPostScriptNameKey);

   878           CFStringRef run_ps_name = CTFontCopyName (run_ct_font, kCTFontPostScriptNameKey);

   879           CFComparisonResult result = CFStringCompare (run_ps_name, font_ps_name, 0);

   880           CFRelease (run_ps_name);

   881           CFRelease (font_ps_name);

   882           if (result == kCFCompareEqualTo)

   883             matched = true;

   884         }

   885         if (!matched)

   886         {

   887           CFRange range = CTRunGetStringRange (run);

   888           DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld",

   889                      range.location, range.location + range.length);

   890           if (!buffer->ensure_inplace (buffer->len + range.length))

   891             goto resize_and_retry;

   892           hb_glyph_info_t *info = buffer->info + buffer->len;

   893 

   894           hb_codepoint_t notdef = 0;

   895           hb_direction_t dir = buffer->props.direction;

   896           hb_position_t x_advance, y_advance, x_offset, y_offset;

   897           hb_font_get_glyph_advance_for_direction (font, notdef, dir, &x_advance, &y_advance);

   898           hb_font_get_glyph_origin_for_direction (font, notdef, dir, &x_offset, &y_offset);

   899           hb_position_t advance = x_advance + y_advance;

   900           x_offset = -x_offset;

   901           y_offset = -y_offset;

   902 

   903           unsigned int old_len = buffer->len;

   904           for (CFIndex j = range.location; j < range.location + range.length; j++)

   905           {

   906               UniChar ch = CFStringGetCharacterAtIndex (string_ref, j);

   907               if (hb_in_range<UniChar> (ch, 0xDC00u, 0xDFFFu) && range.location < j)

   908               {

   909                 ch = CFStringGetCharacterAtIndex (string_ref, j - 1);

   910                 if (hb_in_range<UniChar> (ch, 0xD800u, 0xDBFFu))

   911                   /* This is the second of a surrogate pair.  Don't need .notdef

   912                    * for this one. */

   913                   continue;

   914               }

   915               if (buffer->unicode->is_default_ignorable (ch))

   916                 continue;

   917 

   918               info->codepoint = notdef;

   919               info->cluster = log_clusters[j];

   920 

   921               info->mask = advance;

   922               info->var1.i32 = x_offset;

   923               info->var2.i32 = y_offset;

   924 

   925               info++;

   926               buffer->len++;

   927           }

   928           if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))

   929             buffer->reverse_range (old_len, buffer->len);

   930           advances_so_far += run_advance;

   931           continue;

   932         }

   933       }

   934 

   935       unsigned int num_glyphs = CTRunGetGlyphCount (run);

   936       if (num_glyphs == 0)

   937         continue;

   938 

   939       if (!buffer->ensure_inplace (buffer->len + num_glyphs))

   940         goto resize_and_retry;

   941 

   942       hb_glyph_info_t *run_info = buffer->info + buffer->len;

   943 

   944       /* Testing used to indicate that CTRunGetGlyphsPtr, etc (almost?) always

   945        * succeed, and so copying data to our own buffer will be rare.  Reports

   946        * have it that this changed in OS X 10.10 Yosemite, and NULL is returned

   947        * frequently.  At any rate, we can test that codepath by setting USE_PTR

   948        * to false. */

   949 

   950 #define USE_PTR true

   951 

   952 #define SCRATCH_SAVE() \

   953   unsigned int scratch_size_saved = scratch_size; \

   954   hb_buffer_t::scratch_buffer_t *scratch_saved = scratch

   955 

   956 #define SCRATCH_RESTORE() \

   957   scratch_size = scratch_size_saved; \

   958   scratch = scratch_saved;

   959 

   960       { /* Setup glyphs */

   961         SCRATCH_SAVE();

   962         const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : NULL;

   963         if (!glyphs) {

   964           ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry);

   965           CTRunGetGlyphs (run, range_all, glyph_buf);

   966           glyphs = glyph_buf;

   967         }

   968         const CFIndex* string_indices = USE_PTR ? CTRunGetStringIndicesPtr (run) : NULL;

   969         if (!string_indices) {

   970           ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs, goto resize_and_retry);

   971           CTRunGetStringIndices (run, range_all, index_buf);

   972           string_indices = index_buf;

   973         }

   974         hb_glyph_info_t *info = run_info;

   975         for (unsigned int j = 0; j < num_glyphs; j++)

   976         {

   977           info->codepoint = glyphs[j];

   978           info->cluster = log_clusters[string_indices[j]];

   979           info++;

   980         }

   981         SCRATCH_RESTORE();

   982       }

   983       {

   984         /* Setup positions.

   985          * Note that CoreText does not return advances for glyphs.  As such,

   986          * for all but last glyph, we use the delta position to next glyph as

   987          * advance (in the advance direction only), and for last glyph we set

   988          * whatever is needed to make the whole run's advance add up. */

   989         SCRATCH_SAVE();

   990         const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : NULL;

   991         if (!positions) {

   992           ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry);

   993           CTRunGetPositions (run, range_all, position_buf);

   994           positions = position_buf;

   995         }

   996         hb_glyph_info_t *info = run_info;

   997         CGFloat x_mult = font_data->x_mult, y_mult = font_data->y_mult;

   998         if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))

   999         {

  1000           hb_position_t x_offset = (positions[0].x - advances_so_far) * x_mult;

  1001           for (unsigned int j = 0; j < num_glyphs; j++)

  1002           {

  1003             double advance;

  1004             if (likely (j + 1 < num_glyphs))

  1005               advance = positions[j + 1].x - positions[j].x;

  1006             else /* last glyph */

  1007               advance = run_advance - (positions[j].x - positions[0].x);

  1008             info->mask = advance * x_mult;

  1009             info->var1.i32 = x_offset;

  1010             info->var2.i32 = positions[j].y * y_mult;

  1011             info++;

  1012           }

  1013         }

  1014         else

  1015         {

  1016           hb_position_t y_offset = (positions[0].y - advances_so_far) * y_mult;

  1017           for (unsigned int j = 0; j < num_glyphs; j++)

  1018           {

  1019             double advance;

  1020             if (likely (j + 1 < num_glyphs))

  1021               advance = positions[j + 1].y - positions[j].y;

  1022             else /* last glyph */

  1023               advance = run_advance - (positions[j].y - positions[0].y);

  1024             info->mask = advance * y_mult;

  1025             info->var1.i32 = positions[j].x * x_mult;

  1026             info->var2.i32 = y_offset;

  1027             info++;

  1028           }

  1029         }

  1030         SCRATCH_RESTORE();

  1031         advances_so_far += run_advance;

  1032       }

  1033 #undef SCRATCH_RESTORE

  1034 #undef SCRATCH_SAVE

  1035 #undef USE_PTR

  1036 #undef ALLOCATE_ARRAY

  1037 

  1038       buffer->len += num_glyphs;

  1039     }

  1040 

  1041     /* Mac OS 10.6 doesn't have kCTTypesetterOptionForcedEmbeddingLevel,

  1042      * or if it does, it doesn't resepct it.  So we get runs with wrong

  1043      * directions.  As such, disable the assert...  It wouldn't crash, but

  1044      * cursoring will be off...

  1045      *

  1046      * http://crbug.com/419769

  1047      */

  1048     if (0)

  1049     {

  1050       /* Make sure all runs had the expected direction. */

  1051       bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);

  1052       assert (bool (status_and & kCTRunStatusRightToLeft) == backward);

  1053       assert (bool (status_or  & kCTRunStatusRightToLeft) == backward);

  1054     }

  1055 

  1056     buffer->clear_positions ();

  1057 

  1058     unsigned int count = buffer->len;

  1059     hb_glyph_info_t *info = buffer->info;

  1060     hb_glyph_position_t *pos = buffer->pos;

  1061     if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))

  1062       for (unsigned int i = 0; i < count; i++)

  1063       {

  1064         pos->x_advance = info->mask;

  1065         pos->x_offset = info->var1.i32;

  1066         pos->y_offset = info->var2.i32;

  1067         info++, pos++;

  1068       }

  1069     else

  1070       for (unsigned int i = 0; i < count; i++)

  1071       {

  1072         pos->y_advance = info->mask;

  1073         pos->x_offset = info->var1.i32;

  1074         pos->y_offset = info->var2.i32;

  1075         info++, pos++;

  1076       }

  1077 

  1078     /* Fix up clusters so that we never return out-of-order indices;

  1079      * if core text has reordered glyphs, we'll merge them to the

  1080      * beginning of the reordered cluster.  CoreText is nice enough

  1081      * to tell us whenever it has produced nonmonotonic results...

  1082      * Note that we assume the input clusters were nonmonotonic to

  1083      * begin with.

  1084      *

  1085      * This does *not* mean we'll form the same clusters as Uniscribe

  1086      * or the native OT backend, only that the cluster indices will be

  1087      * monotonic in the output buffer. */

  1088     if (count > 1 && (status_or & kCTRunStatusNonMonotonic))

  1089     {

  1090       hb_glyph_info_t *info = buffer->info;

  1091       if (HB_DIRECTION_IS_FORWARD (buffer->props.direction))

  1092       {

  1093         unsigned int cluster = info[count - 1].cluster;

  1094         for (unsigned int i = count - 1; i > 0; i--)

  1095         {

  1096           cluster = MIN (cluster, info[i - 1].cluster);

  1097           info[i - 1].cluster = cluster;

  1098         }

  1099       }

  1100       else

  1101       {

  1102         unsigned int cluster = info[0].cluster;

  1103         for (unsigned int i = 1; i < count; i++)

  1104         {

  1105           cluster = MIN (cluster, info[i].cluster);

  1106           info[i].cluster = cluster;

  1107         }

  1108       }

  1109     }

  1110   }

  1111 

  1112 #undef FAIL

  1113 

  1114 fail:

  1115   if (string_ref)

  1116     CFRelease (string_ref);

  1117   if (line)

  1118     CFRelease (line);

  1119 

  1120   for (unsigned int i = 0; i < range_records.len; i++)

  1121     if (range_records[i].font)

  1122       CFRelease (range_records[i].font);

  1123 

  1124   return ret;

  1125 }

  1126 

  1127 

  1128 /*

  1129  * AAT shaper

  1130  */

  1131 

  1132 HB_SHAPER_DATA_ENSURE_DECLARE(coretext_aat, face)

  1133 HB_SHAPER_DATA_ENSURE_DECLARE(coretext_aat, font)

  1134 

  1135