gfx/harfbuzz/src/hb-ot-shape-complex.hh

   1 /*
   2  * Copyright © 2010,2011,2012  Google, Inc.
   3  *
   4  *  This is part of HarfBuzz, a text shaping library.
   5  *
   6  * Permission is hereby granted, without written agreement and without
   7  * license or royalty fees, to use, copy, modify, and distribute this
   8  * software and its documentation for any purpose, provided that the
   9  * above copyright notice and the following two paragraphs appear in
  10  * all copies of this software.
  11  *
  12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  16  * DAMAGE.
  17  *
  18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  23  *
  24  * Google Author(s): Behdad Esfahbod
  25  */
  26
  27 #ifndef HB_OT_SHAPE_COMPLEX_HH
  28 #define HB_OT_SHAPE_COMPLEX_HH
  29
  30 #include "hb.hh"
  31
  32 #include "hb-ot-layout.hh"
  33 #include "hb-ot-shape.hh"
  34 #include "hb-ot-shape-normalize.hh"
  35
  36
  37 /* buffer var allocations, used by complex shapers */
  38 #define complex_var_u8_category()       var2.u8[2]
  39 #define complex_var_u8_auxiliary()      var2.u8[3]
  40
  41
  42 #define HB_OT_SHAPE_COMPLEX_MAX_COMBINING_MARKS 32
  43
  44 enum hb_ot_shape_zero_width_marks_type_t {
  45   HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
  46   HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
  47   HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE
  48 };
  49
  50
  51 /* Master OT shaper list */
  52 #define HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS \
  53   HB_COMPLEX_SHAPER_IMPLEMENT (arabic) \
  54   HB_COMPLEX_SHAPER_IMPLEMENT (default) \
  55   HB_COMPLEX_SHAPER_IMPLEMENT (dumber) \
  56   HB_COMPLEX_SHAPER_IMPLEMENT (hangul) \
  57   HB_COMPLEX_SHAPER_IMPLEMENT (hebrew) \
  58   HB_COMPLEX_SHAPER_IMPLEMENT (indic) \
  59   HB_COMPLEX_SHAPER_IMPLEMENT (khmer) \
  60   HB_COMPLEX_SHAPER_IMPLEMENT (myanmar) \
  61   HB_COMPLEX_SHAPER_IMPLEMENT (myanmar_zawgyi) \
  62   HB_COMPLEX_SHAPER_IMPLEMENT (thai) \
  63   HB_COMPLEX_SHAPER_IMPLEMENT (use) \
  64   /* ^--- Add new shapers here; keep sorted. */
  65
  66
  67 struct hb_ot_complex_shaper_t
  68 {
  69   /* collect_features()
  70    * Called during shape_plan().
  71    * Shapers should use plan->map to add their features and callbacks.
  72    * May be NULL.
  73    */
  74   void (*collect_features) (hb_ot_shape_planner_t *plan);
  75
  76   /* override_features()
  77    * Called during shape_plan().
  78    * Shapers should use plan->map to override features and add callbacks after
  79    * common features are added.
  80    * May be NULL.
  81    */
  82   void (*override_features) (hb_ot_shape_planner_t *plan);
  83
  84
  85   /* data_create()
  86    * Called at the end of shape_plan().
  87    * Whatever shapers return will be accessible through plan->data later.
  88    * If nullptr is returned, means a plan failure.
  89    */
  90   void *(*data_create) (const hb_ot_shape_plan_t *plan);
  91
  92   /* data_destroy()
  93    * Called when the shape_plan is being destroyed.
  94    * plan->data is passed here for destruction.
  95    * If nullptr is returned, means a plan failure.
  96    * May be NULL.
  97    */
  98   void (*data_destroy) (void *data);
  99
 100
 101   /* preprocess_text()
 102    * Called during shape().
 103    * Shapers can use to modify text before shaping starts.
 104    * May be NULL.
 105    */
 106   void (*preprocess_text) (const hb_ot_shape_plan_t *plan,
 107                            hb_buffer_t              *buffer,
 108                            hb_font_t                *font);
 109
 110   /* postprocess_glyphs()
 111    * Called during shape().
 112    * Shapers can use to modify glyphs after shaping ends.
 113    * May be NULL.
 114    */
 115   void (*postprocess_glyphs) (const hb_ot_shape_plan_t *plan,
 116                               hb_buffer_t              *buffer,
 117                               hb_font_t                *font);
 118
 119
 120   hb_ot_shape_normalization_mode_t normalization_preference;
 121
 122   /* decompose()
 123    * Called during shape()'s normalization.
 124    * May be NULL.
 125    */
 126   bool (*decompose) (const hb_ot_shape_normalize_context_t *c,
 127                      hb_codepoint_t  ab,
 128                      hb_codepoint_t *a,
 129                      hb_codepoint_t *b);
 130
 131   /* compose()
 132    * Called during shape()'s normalization.
 133    * May be NULL.
 134    */
 135   bool (*compose) (const hb_ot_shape_normalize_context_t *c,
 136                    hb_codepoint_t  a,
 137                    hb_codepoint_t  b,
 138                    hb_codepoint_t *ab);
 139
 140   /* setup_masks()
 141    * Called during shape().
 142    * Shapers should use map to get feature masks and set on buffer.
 143    * Shapers may NOT modify characters.
 144    * May be NULL.
 145    */
 146   void (*setup_masks) (const hb_ot_shape_plan_t *plan,
 147                        hb_buffer_t              *buffer,
 148                        hb_font_t                *font);
 149
 150   /* gpos_tag()
 151    * If not HB_TAG_NONE, then must match found GPOS script tag for
 152    * GPOS to be applied.  Otherwise, fallback positioning will be used.
 153    */
 154   hb_tag_t gpos_tag;
 155
 156   /* reorder_marks()
 157    * Called during shape().
 158    * Shapers can use to modify ordering of combining marks.
 159    * May be NULL.
 160    */
 161   void (*reorder_marks) (const hb_ot_shape_plan_t *plan,
 162                          hb_buffer_t              *buffer,
 163                          unsigned int              start,
 164                          unsigned int              end);
 165
 166   hb_ot_shape_zero_width_marks_type_t zero_width_marks;
 167
 168   bool fallback_position;
 169 };
 170
 171 #define HB_COMPLEX_SHAPER_IMPLEMENT(name) extern HB_INTERNAL const hb_ot_complex_shaper_t _hb_ot_complex_shaper_##name;
 172 HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS
 173 #undef HB_COMPLEX_SHAPER_IMPLEMENT
 174
 175
 176 static inline const hb_ot_complex_shaper_t *
 177 hb_ot_shape_complex_categorize (const hb_ot_shape_planner_t *planner)
 178 {
 179   switch ((hb_tag_t) planner->props.script)
 180   {
 181     default:
 182       return &_hb_ot_complex_shaper_default;
 183
 184
 185     /* Unicode-1.1 additions */
 186     case HB_SCRIPT_ARABIC:
 187
 188     /* Unicode-3.0 additions */
 189     case HB_SCRIPT_SYRIAC:
 190
 191       /* For Arabic script, use the Arabic shaper even if no OT script tag was found.
 192        * This is because we do fallback shaping for Arabic script (and not others).
 193        * But note that Arabic shaping is applicable only to horizontal layout; for
 194        * vertical text, just use the generic shaper instead. */
 195       if ((planner->map.chosen_script[0] != HB_OT_TAG_DEFAULT_SCRIPT ||
 196            planner->props.script == HB_SCRIPT_ARABIC) &&
 197           HB_DIRECTION_IS_HORIZONTAL(planner->props.direction))
 198         return &_hb_ot_complex_shaper_arabic;
 199       else
 200         return &_hb_ot_complex_shaper_default;
 201
 202
 203     /* Unicode-1.1 additions */
 204     case HB_SCRIPT_THAI:
 205     case HB_SCRIPT_LAO:
 206
 207       return &_hb_ot_complex_shaper_thai;
 208
 209
 210     /* Unicode-1.1 additions */
 211     case HB_SCRIPT_HANGUL:
 212
 213       return &_hb_ot_complex_shaper_hangul;
 214
 215
 216     /* Unicode-1.1 additions */
 217     case HB_SCRIPT_HEBREW:
 218
 219       return &_hb_ot_complex_shaper_hebrew;
 220
 221
 222     /* Unicode-1.1 additions */
 223     case HB_SCRIPT_BENGALI:
 224     case HB_SCRIPT_DEVANAGARI:
 225     case HB_SCRIPT_GUJARATI:
 226     case HB_SCRIPT_GURMUKHI:
 227     case HB_SCRIPT_KANNADA:
 228     case HB_SCRIPT_MALAYALAM:
 229     case HB_SCRIPT_ORIYA:
 230     case HB_SCRIPT_TAMIL:
 231     case HB_SCRIPT_TELUGU:
 232
 233     /* Unicode-3.0 additions */
 234     case HB_SCRIPT_SINHALA:
 235
 236       /* If the designer designed the font for the 'DFLT' script,
 237        * (or we ended up arbitrarily pick 'latn'), use the default shaper.
 238        * Otherwise, use the specific shaper.
 239        *
 240        * If it's indy3 tag, send to USE. */
 241       if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T') ||
 242           planner->map.chosen_script[0] == HB_TAG ('l','a','t','n'))
 243         return &_hb_ot_complex_shaper_default;
 244       else if ((planner->map.chosen_script[0] & 0x000000FF) == '3')
 245         return &_hb_ot_complex_shaper_use;
 246       else
 247         return &_hb_ot_complex_shaper_indic;
 248
 249     case HB_SCRIPT_KHMER:
 250         return &_hb_ot_complex_shaper_khmer;
 251
 252     case HB_SCRIPT_MYANMAR:
 253       /* If the designer designed the font for the 'DFLT' script,
 254        * (or we ended up arbitrarily pick 'latn'), use the default shaper.
 255        * Otherwise, use the specific shaper.
 256        *
 257        * If designer designed for 'mymr' tag, also send to default
 258        * shaper.  That's tag used from before Myanmar shaping spec
 259        * was developed.  The shaping spec uses 'mym2' tag. */
 260       if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T') ||
 261           planner->map.chosen_script[0] == HB_TAG ('l','a','t','n') ||
 262           planner->map.chosen_script[0] == HB_TAG ('m','y','m','r'))
 263         return &_hb_ot_complex_shaper_default;
 264       else
 265         return &_hb_ot_complex_shaper_myanmar;
 266
 267
 268 #define HB_SCRIPT_MYANMAR_ZAWGYI        ((hb_script_t) HB_TAG ('Q','a','a','g'))
 269     case HB_SCRIPT_MYANMAR_ZAWGYI:
 270     /* https://github.com/harfbuzz/harfbuzz/issues/1162 */
 271
 272       return &_hb_ot_complex_shaper_myanmar_zawgyi;
 273
 274
 275     /* Unicode-2.0 additions */
 276     case HB_SCRIPT_TIBETAN:
 277
 278     /* Unicode-3.0 additions */
 279     case HB_SCRIPT_MONGOLIAN:
 280     //case HB_SCRIPT_SINHALA:
 281
 282     /* Unicode-3.2 additions */
 283     case HB_SCRIPT_BUHID:
 284     case HB_SCRIPT_HANUNOO:
 285     case HB_SCRIPT_TAGALOG:
 286     case HB_SCRIPT_TAGBANWA:
 287
 288     /* Unicode-4.0 additions */
 289     case HB_SCRIPT_LIMBU:
 290     case HB_SCRIPT_TAI_LE:
 291
 292     /* Unicode-4.1 additions */
 293     case HB_SCRIPT_BUGINESE:
 294     case HB_SCRIPT_KHAROSHTHI:
 295     case HB_SCRIPT_SYLOTI_NAGRI:
 296     case HB_SCRIPT_TIFINAGH:
 297
 298     /* Unicode-5.0 additions */
 299     case HB_SCRIPT_BALINESE:
 300     case HB_SCRIPT_NKO:
 301     case HB_SCRIPT_PHAGS_PA:
 302
 303     /* Unicode-5.1 additions */
 304     case HB_SCRIPT_CHAM:
 305     case HB_SCRIPT_KAYAH_LI:
 306     case HB_SCRIPT_LEPCHA:
 307     case HB_SCRIPT_REJANG:
 308     case HB_SCRIPT_SAURASHTRA:
 309     case HB_SCRIPT_SUNDANESE:
 310
 311     /* Unicode-5.2 additions */
 312     case HB_SCRIPT_EGYPTIAN_HIEROGLYPHS:
 313     case HB_SCRIPT_JAVANESE:
 314     case HB_SCRIPT_KAITHI:
 315     case HB_SCRIPT_MEETEI_MAYEK:
 316     case HB_SCRIPT_TAI_THAM:
 317     case HB_SCRIPT_TAI_VIET:
 318
 319     /* Unicode-6.0 additions */
 320     case HB_SCRIPT_BATAK:
 321     case HB_SCRIPT_BRAHMI:
 322     case HB_SCRIPT_MANDAIC:
 323
 324     /* Unicode-6.1 additions */
 325     case HB_SCRIPT_CHAKMA:
 326     case HB_SCRIPT_MIAO:
 327     case HB_SCRIPT_SHARADA:
 328     case HB_SCRIPT_TAKRI:
 329
 330     /* Unicode-7.0 additions */
 331     case HB_SCRIPT_DUPLOYAN:
 332     case HB_SCRIPT_GRANTHA:
 333     case HB_SCRIPT_KHOJKI:
 334     case HB_SCRIPT_KHUDAWADI:
 335     case HB_SCRIPT_MAHAJANI:
 336     case HB_SCRIPT_MANICHAEAN:
 337     case HB_SCRIPT_MODI:
 338     case HB_SCRIPT_PAHAWH_HMONG:
 339     case HB_SCRIPT_PSALTER_PAHLAVI:
 340     case HB_SCRIPT_SIDDHAM:
 341     case HB_SCRIPT_TIRHUTA:
 342
 343     /* Unicode-8.0 additions */
 344     case HB_SCRIPT_AHOM:
 345     case HB_SCRIPT_MULTANI:
 346
 347     /* Unicode-9.0 additions */
 348     case HB_SCRIPT_ADLAM:
 349     case HB_SCRIPT_BHAIKSUKI:
 350     case HB_SCRIPT_MARCHEN:
 351     case HB_SCRIPT_NEWA:
 352
 353     /* Unicode-10.0 additions */
 354     case HB_SCRIPT_MASARAM_GONDI:
 355     case HB_SCRIPT_SOYOMBO:
 356     case HB_SCRIPT_ZANABAZAR_SQUARE:
 357
 358     /* Unicode-11.0 additions */
 359     case HB_SCRIPT_DOGRA:
 360     case HB_SCRIPT_GUNJALA_GONDI:
 361     case HB_SCRIPT_HANIFI_ROHINGYA:
 362     case HB_SCRIPT_MAKASAR:
 363     case HB_SCRIPT_MEDEFAIDRIN:
 364     case HB_SCRIPT_OLD_SOGDIAN:
 365     case HB_SCRIPT_SOGDIAN:
 366
 367     /* Unicode-12.0 additions */
 368     case HB_SCRIPT_ELYMAIC:
 369     case HB_SCRIPT_NANDINAGARI:
 370     case HB_SCRIPT_NYIAKENG_PUACHUE_HMONG:
 371     case HB_SCRIPT_WANCHO:
 372
 373     /* Unicode-13.0 additions */
 374     case HB_SCRIPT_CHORASMIAN:
 375     case HB_SCRIPT_DIVES_AKURU:
 376     case HB_SCRIPT_KHITAN_SMALL_SCRIPT:
 377     case HB_SCRIPT_YEZIDI:
 378
 379     /* Unicode-14.0 additions */
 380     case HB_SCRIPT_CYPRO_MINOAN:
 381     case HB_SCRIPT_OLD_UYGHUR:
 382     case HB_SCRIPT_TANGSA:
 383     case HB_SCRIPT_TOTO:
 384     case HB_SCRIPT_VITHKUQI:
 385
 386       /* If the designer designed the font for the 'DFLT' script,
 387        * (or we ended up arbitrarily pick 'latn'), use the default shaper.
 388        * Otherwise, use the specific shaper.
 389        * Note that for some simple scripts, there may not be *any*
 390        * GSUB/GPOS needed, so there may be no scripts found! */
 391       if (planner->map.chosen_script[0] == HB_TAG ('D','F','L','T') ||
 392           planner->map.chosen_script[0] == HB_TAG ('l','a','t','n'))
 393         return &_hb_ot_complex_shaper_default;
 394       else
 395         return &_hb_ot_complex_shaper_use;
 396   }
 397 }
 398
 399
 400 #endif /* HB_OT_SHAPE_COMPLEX_HH */