third_party/harfbuzz-ng/src/hb-unicode.cc

   1 /*
   2  * Copyright © 2009  Red Hat, Inc.
   3  * Copyright © 2011  Codethink Limited
   4  * Copyright © 2010,2011,2012  Google, Inc.
   5  *
   6  *  This is part of HarfBuzz, a text shaping library.
   7  *
   8  * Permission is hereby granted, without written agreement and without
   9  * license or royalty fees, to use, copy, modify, and distribute this
  10  * software and its documentation for any purpose, provided that the
  11  * above copyright notice and the following two paragraphs appear in
  12  * all copies of this software.
  13  *
  14  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  15  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  16  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  17  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  18  * DAMAGE.
  19  *
  20  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  21  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  22  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  23  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  24  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  25  *
  26  * Red Hat Author(s): Behdad Esfahbod
  27  * Codethink Author(s): Ryan Lortie
  28  * Google Author(s): Behdad Esfahbod
  29  */
  30
  31 #include "hb-private.hh"
  32
  33 #include "hb-unicode-private.hh"
  34
  35
  36
  37 /*
  38  * hb_unicode_funcs_t
  39  */
  40
  41 static hb_unicode_combining_class_t
  42 hb_unicode_combining_class_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
  43                                 hb_codepoint_t      unicode   HB_UNUSED,
  44                                 void               *user_data HB_UNUSED)
  45 {
  46   return HB_UNICODE_COMBINING_CLASS_NOT_REORDERED;
  47 }
  48
  49 static unsigned int
  50 hb_unicode_eastasian_width_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
  51                                 hb_codepoint_t      unicode   HB_UNUSED,
  52                                 void               *user_data HB_UNUSED)
  53 {
  54   return 1;
  55 }
  56
  57 static hb_unicode_general_category_t
  58 hb_unicode_general_category_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
  59                                  hb_codepoint_t      unicode   HB_UNUSED,
  60                                  void               *user_data HB_UNUSED)
  61 {
  62   return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
  63 }
  64
  65 static hb_codepoint_t
  66 hb_unicode_mirroring_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
  67                           hb_codepoint_t      unicode   HB_UNUSED,
  68                           void               *user_data HB_UNUSED)
  69 {
  70   return unicode;
  71 }
  72
  73 static hb_script_t
  74 hb_unicode_script_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
  75                        hb_codepoint_t      unicode   HB_UNUSED,
  76                        void               *user_data HB_UNUSED)
  77 {
  78   return HB_SCRIPT_UNKNOWN;
  79 }
  80
  81 static hb_bool_t
  82 hb_unicode_compose_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
  83                         hb_codepoint_t      a         HB_UNUSED,
  84                         hb_codepoint_t      b         HB_UNUSED,
  85                         hb_codepoint_t     *ab        HB_UNUSED,
  86                         void               *user_data HB_UNUSED)
  87 {
  88   return false;
  89 }
  90
  91 static hb_bool_t
  92 hb_unicode_decompose_nil (hb_unicode_funcs_t *ufuncs    HB_UNUSED,
  93                           hb_codepoint_t      ab        HB_UNUSED,
  94                           hb_codepoint_t     *a         HB_UNUSED,
  95                           hb_codepoint_t     *b         HB_UNUSED,
  96                           void               *user_data HB_UNUSED)
  97 {
  98   return false;
  99 }
 100
 101
 102 static unsigned int
 103 hb_unicode_decompose_compatibility_nil (hb_unicode_funcs_t *ufuncs     HB_UNUSED,
 104                                         hb_codepoint_t      u          HB_UNUSED,
 105                                         hb_codepoint_t     *decomposed HB_UNUSED,
 106                                         void               *user_data  HB_UNUSED)
 107 {
 108   return 0;
 109 }
 110
 111
 112 #define HB_UNICODE_FUNCS_IMPLEMENT_SET \
 113   HB_UNICODE_FUNCS_IMPLEMENT (glib) \
 114   HB_UNICODE_FUNCS_IMPLEMENT (icu) \
 115   HB_UNICODE_FUNCS_IMPLEMENT (ucdn) \
 116   HB_UNICODE_FUNCS_IMPLEMENT (nil) \
 117   /* ^--- Add new callbacks before nil */
 118
 119 #define hb_nil_get_unicode_funcs hb_unicode_funcs_get_empty
 120
 121 /* Prototype them all */
 122 #define HB_UNICODE_FUNCS_IMPLEMENT(set) \
 123 extern "C" hb_unicode_funcs_t *hb_##set##_get_unicode_funcs (void);
 124 HB_UNICODE_FUNCS_IMPLEMENT_SET
 125 #undef HB_UNICODE_FUNCS_IMPLEMENT
 126
 127
 128 hb_unicode_funcs_t *
 129 hb_unicode_funcs_get_default (void)
 130 {
 131 #define HB_UNICODE_FUNCS_IMPLEMENT(set) \
 132   return hb_##set##_get_unicode_funcs ();
 133
 134 #ifdef HAVE_GLIB
 135   HB_UNICODE_FUNCS_IMPLEMENT(glib)
 136 #elif defined(HAVE_ICU) && defined(HAVE_ICU_BUILTIN)
 137   HB_UNICODE_FUNCS_IMPLEMENT(icu)
 138 #elif defined(HAVE_UCDN)
 139   HB_UNICODE_FUNCS_IMPLEMENT(ucdn)
 140 #else
 141 #define HB_UNICODE_FUNCS_NIL 1
 142   HB_UNICODE_FUNCS_IMPLEMENT(nil)
 143 #endif
 144
 145 #undef HB_UNICODE_FUNCS_IMPLEMENT
 146 }
 147
 148 #if !defined(HB_NO_UNICODE_FUNCS) && defined(HB_UNICODE_FUNCS_NIL)
 149 #error "Could not find any Unicode functions implementation, you have to provide your own"
 150 #error "Consider building hb-ucdn.c.  If you absolutely want to build without any, check the code."
 151 #endif
 152
 153 /**
 154  * hb_unicode_funcs_create: (Xconstructor)
 155  * @parent: (nullable):
 156  *
 157  *
 158  *
 159  * Return value: (transfer full):
 160  *
 161  * Since: 1.0
 162  **/
 163 hb_unicode_funcs_t *
 164 hb_unicode_funcs_create (hb_unicode_funcs_t *parent)
 165 {
 166   hb_unicode_funcs_t *ufuncs;
 167
 168   if (!(ufuncs = hb_object_create<hb_unicode_funcs_t> ()))
 169     return hb_unicode_funcs_get_empty ();
 170
 171   if (!parent)
 172     parent = hb_unicode_funcs_get_empty ();
 173
 174   hb_unicode_funcs_make_immutable (parent);
 175   ufuncs->parent = hb_unicode_funcs_reference (parent);
 176
 177   ufuncs->func = parent->func;
 178
 179   /* We can safely copy user_data from parent since we hold a reference
 180    * onto it and it's immutable.  We should not copy the destroy notifiers
 181    * though. */
 182   ufuncs->user_data = parent->user_data;
 183
 184   return ufuncs;
 185 }
 186
 187
 188 const hb_unicode_funcs_t _hb_unicode_funcs_nil = {
 189   HB_OBJECT_HEADER_STATIC,
 190
 191   NULL, /* parent */
 192   true, /* immutable */
 193   {
 194 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_nil,
 195     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 196 #undef HB_UNICODE_FUNC_IMPLEMENT
 197   }
 198 };
 199
 200 /**
 201  * hb_unicode_funcs_get_empty:
 202  *
 203  *
 204  *
 205  * Return value: (transfer full):
 206  *
 207  * Since: 1.0
 208  **/
 209 hb_unicode_funcs_t *
 210 hb_unicode_funcs_get_empty (void)
 211 {
 212   return const_cast<hb_unicode_funcs_t *> (&_hb_unicode_funcs_nil);
 213 }
 214
 215 /**
 216  * hb_unicode_funcs_reference: (skip)
 217  * @ufuncs: Unicode functions.
 218  *
 219  *
 220  *
 221  * Return value: (transfer full):
 222  *
 223  * Since: 1.0
 224  **/
 225 hb_unicode_funcs_t *
 226 hb_unicode_funcs_reference (hb_unicode_funcs_t *ufuncs)
 227 {
 228   return hb_object_reference (ufuncs);
 229 }
 230
 231 /**
 232  * hb_unicode_funcs_destroy: (skip)
 233  * @ufuncs: Unicode functions.
 234  *
 235  *
 236  *
 237  * Since: 1.0
 238  **/
 239 void
 240 hb_unicode_funcs_destroy (hb_unicode_funcs_t *ufuncs)
 241 {
 242   if (!hb_object_destroy (ufuncs)) return;
 243
 244 #define HB_UNICODE_FUNC_IMPLEMENT(name) \
 245   if (ufuncs->destroy.name) ufuncs->destroy.name (ufuncs->user_data.name);
 246     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 247 #undef HB_UNICODE_FUNC_IMPLEMENT
 248
 249   hb_unicode_funcs_destroy (ufuncs->parent);
 250
 251   free (ufuncs);
 252 }
 253
 254 /**
 255  * hb_unicode_funcs_set_user_data: (skip)
 256  * @ufuncs: Unicode functions.
 257  * @key:
 258  * @data:
 259  * @destroy:
 260  * @replace:
 261  *
 262  *
 263  *
 264  * Return value:
 265  *
 266  * Since: 1.0
 267  **/
 268 hb_bool_t
 269 hb_unicode_funcs_set_user_data (hb_unicode_funcs_t *ufuncs,
 270                                 hb_user_data_key_t *key,
 271                                 void *              data,
 272                                 hb_destroy_func_t   destroy,
 273                                 hb_bool_t           replace)
 274 {
 275   return hb_object_set_user_data (ufuncs, key, data, destroy, replace);
 276 }
 277
 278 /**
 279  * hb_unicode_funcs_get_user_data: (skip)
 280  * @ufuncs: Unicode functions.
 281  * @key:
 282  *
 283  *
 284  *
 285  * Return value: (transfer none):
 286  *
 287  * Since: 1.0
 288  **/
 289 void *
 290 hb_unicode_funcs_get_user_data (hb_unicode_funcs_t *ufuncs,
 291                                 hb_user_data_key_t *key)
 292 {
 293   return hb_object_get_user_data (ufuncs, key);
 294 }
 295
 296
 297 /**
 298  * hb_unicode_funcs_make_immutable:
 299  * @ufuncs: Unicode functions.
 300  *
 301  *
 302  *
 303  * Since: 1.0
 304  **/
 305 void
 306 hb_unicode_funcs_make_immutable (hb_unicode_funcs_t *ufuncs)
 307 {
 308   if (unlikely (hb_object_is_inert (ufuncs)))
 309     return;
 310
 311   ufuncs->immutable = true;
 312 }
 313
 314 /**
 315  * hb_unicode_funcs_is_immutable:
 316  * @ufuncs: Unicode functions.
 317  *
 318  *
 319  *
 320  * Return value:
 321  *
 322  * Since: 1.0
 323  **/
 324 hb_bool_t
 325 hb_unicode_funcs_is_immutable (hb_unicode_funcs_t *ufuncs)
 326 {
 327   return ufuncs->immutable;
 328 }
 329
 330 /**
 331  * hb_unicode_funcs_get_parent:
 332  * @ufuncs: Unicode functions.
 333  *
 334  *
 335  *
 336  * Return value:
 337  *
 338  * Since: 1.0
 339  **/
 340 hb_unicode_funcs_t *
 341 hb_unicode_funcs_get_parent (hb_unicode_funcs_t *ufuncs)
 342 {
 343   return ufuncs->parent ? ufuncs->parent : hb_unicode_funcs_get_empty ();
 344 }
 345
 346
 347 #define HB_UNICODE_FUNC_IMPLEMENT(name)                                         \
 348                                                                                 \
 349 void                                                                            \
 350 hb_unicode_funcs_set_##name##_func (hb_unicode_funcs_t             *ufuncs,     \
 351                                     hb_unicode_##name##_func_t      func,       \
 352                                     void                           *user_data,  \
 353                                     hb_destroy_func_t               destroy)    \
 354 {                                                                               \
 355   if (ufuncs->immutable)                                                        \
 356     return;                                                                     \
 357                                                                                 \
 358   if (ufuncs->destroy.name)                                                     \
 359     ufuncs->destroy.name (ufuncs->user_data.name);                              \
 360                                                                                 \
 361   if (func) {                                                                   \
 362     ufuncs->func.name = func;                                                   \
 363     ufuncs->user_data.name = user_data;                                         \
 364     ufuncs->destroy.name = destroy;                                             \
 365   } else {                                                                      \
 366     ufuncs->func.name = ufuncs->parent->func.name;                              \
 367     ufuncs->user_data.name = ufuncs->parent->user_data.name;                    \
 368     ufuncs->destroy.name = NULL;                                                \
 369   }                                                                             \
 370 }
 371
 372 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 373 #undef HB_UNICODE_FUNC_IMPLEMENT
 374
 375
 376 #define HB_UNICODE_FUNC_IMPLEMENT(return_type, name)                            \
 377                                                                                 \
 378 return_type                                                                     \
 379 hb_unicode_##name (hb_unicode_funcs_t *ufuncs,                                  \
 380                    hb_codepoint_t      unicode)                                 \
 381 {                                                                               \
 382   return ufuncs->name (unicode);                                                \
 383 }
 384 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE
 385 #undef HB_UNICODE_FUNC_IMPLEMENT
 386
 387 /**
 388  * hb_unicode_compose:
 389  * @ufuncs: Unicode functions.
 390  * @a:
 391  * @b:
 392  * @ab: (out):
 393  *
 394  *
 395  *
 396  * Return value:
 397  *
 398  * Since: 0.9.2
 399  **/
 400 hb_bool_t
 401 hb_unicode_compose (hb_unicode_funcs_t *ufuncs,
 402                     hb_codepoint_t      a,
 403                     hb_codepoint_t      b,
 404                     hb_codepoint_t     *ab)
 405 {
 406   return ufuncs->compose (a, b, ab);
 407 }
 408
 409 /**
 410  * hb_unicode_decompose:
 411  * @ufuncs: Unicode functions.
 412  * @ab:
 413  * @a: (out):
 414  * @b: (out):
 415  *
 416  *
 417  *
 418  * Return value:
 419  *
 420  * Since: 0.9.2
 421  **/
 422 hb_bool_t
 423 hb_unicode_decompose (hb_unicode_funcs_t *ufuncs,
 424                       hb_codepoint_t      ab,
 425                       hb_codepoint_t     *a,
 426                       hb_codepoint_t     *b)
 427 {
 428   return ufuncs->decompose (ab, a, b);
 429 }
 430
 431 /**
 432  * hb_unicode_decompose_compatibility:
 433  * @ufuncs: Unicode functions.
 434  * @u:
 435  * @decomposed: (out):
 436  *
 437  *
 438  *
 439  * Return value:
 440  *
 441  * Since: 0.9.2
 442  **/
 443 unsigned int
 444 hb_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs,
 445                                     hb_codepoint_t      u,
 446                                     hb_codepoint_t     *decomposed)
 447 {
 448   return ufuncs->decompose_compatibility (u, decomposed);
 449 }
 450
 451
 452 /* See hb-unicode-private.hh for details. */
 453 const uint8_t
 454 _hb_modified_combining_class[256] =
 455 {
 456   0, /* HB_UNICODE_COMBINING_CLASS_NOT_REORDERED */
 457   1, /* HB_UNICODE_COMBINING_CLASS_OVERLAY */
 458   2, 3, 4, 5, 6,
 459   7, /* HB_UNICODE_COMBINING_CLASS_NUKTA */
 460   8, /* HB_UNICODE_COMBINING_CLASS_KANA_VOICING */
 461   9, /* HB_UNICODE_COMBINING_CLASS_VIRAMA */
 462
 463   /* Hebrew */
 464   HB_MODIFIED_COMBINING_CLASS_CCC10,
 465   HB_MODIFIED_COMBINING_CLASS_CCC11,
 466   HB_MODIFIED_COMBINING_CLASS_CCC12,
 467   HB_MODIFIED_COMBINING_CLASS_CCC13,
 468   HB_MODIFIED_COMBINING_CLASS_CCC14,
 469   HB_MODIFIED_COMBINING_CLASS_CCC15,
 470   HB_MODIFIED_COMBINING_CLASS_CCC16,
 471   HB_MODIFIED_COMBINING_CLASS_CCC17,
 472   HB_MODIFIED_COMBINING_CLASS_CCC18,
 473   HB_MODIFIED_COMBINING_CLASS_CCC19,
 474   HB_MODIFIED_COMBINING_CLASS_CCC20,
 475   HB_MODIFIED_COMBINING_CLASS_CCC21,
 476   HB_MODIFIED_COMBINING_CLASS_CCC22,
 477   HB_MODIFIED_COMBINING_CLASS_CCC23,
 478   HB_MODIFIED_COMBINING_CLASS_CCC24,
 479   HB_MODIFIED_COMBINING_CLASS_CCC25,
 480   HB_MODIFIED_COMBINING_CLASS_CCC26,
 481
 482   /* Arabic */
 483   HB_MODIFIED_COMBINING_CLASS_CCC27,
 484   HB_MODIFIED_COMBINING_CLASS_CCC28,
 485   HB_MODIFIED_COMBINING_CLASS_CCC29,
 486   HB_MODIFIED_COMBINING_CLASS_CCC30,
 487   HB_MODIFIED_COMBINING_CLASS_CCC31,
 488   HB_MODIFIED_COMBINING_CLASS_CCC32,
 489   HB_MODIFIED_COMBINING_CLASS_CCC33,
 490   HB_MODIFIED_COMBINING_CLASS_CCC34,
 491   HB_MODIFIED_COMBINING_CLASS_CCC35,
 492
 493   /* Syriac */
 494   HB_MODIFIED_COMBINING_CLASS_CCC36,
 495
 496   37, 38, 39,
 497   40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
 498   60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
 499   80, 81, 82, 83,
 500
 501   /* Telugu */
 502   HB_MODIFIED_COMBINING_CLASS_CCC84,
 503   85, 86, 87, 88, 89, 90,
 504   HB_MODIFIED_COMBINING_CLASS_CCC91,
 505   92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102,
 506
 507   /* Thai */
 508   HB_MODIFIED_COMBINING_CLASS_CCC103,
 509   104, 105, 106,
 510   HB_MODIFIED_COMBINING_CLASS_CCC107,
 511   108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
 512
 513   /* Lao */
 514   HB_MODIFIED_COMBINING_CLASS_CCC118,
 515   119, 120, 121,
 516   HB_MODIFIED_COMBINING_CLASS_CCC122,
 517   123, 124, 125, 126, 127, 128,
 518
 519   /* Tibetan */
 520   HB_MODIFIED_COMBINING_CLASS_CCC129,
 521   HB_MODIFIED_COMBINING_CLASS_CCC130,
 522   131,
 523   HB_MODIFIED_COMBINING_CLASS_CCC132,
 524   133, 134, 135, 136, 137, 138, 139,
 525
 526
 527   140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
 528   150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
 529   160, 161, 162, 163, 164, 165, 166, 167, 168, 169,
 530   170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
 531   180, 181, 182, 183, 184, 185, 186, 187, 188, 189,
 532   190, 191, 192, 193, 194, 195, 196, 197, 198, 199,
 533
 534   200, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW_LEFT */
 535   201,
 536   202, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW */
 537   203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213,
 538   214, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE */
 539   215,
 540   216, /* HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE_RIGHT */
 541   217,
 542   218, /* HB_UNICODE_COMBINING_CLASS_BELOW_LEFT */
 543   219,
 544   220, /* HB_UNICODE_COMBINING_CLASS_BELOW */
 545   221,
 546   222, /* HB_UNICODE_COMBINING_CLASS_BELOW_RIGHT */
 547   223,
 548   224, /* HB_UNICODE_COMBINING_CLASS_LEFT */
 549   225,
 550   226, /* HB_UNICODE_COMBINING_CLASS_RIGHT */
 551   227,
 552   228, /* HB_UNICODE_COMBINING_CLASS_ABOVE_LEFT */
 553   229,
 554   230, /* HB_UNICODE_COMBINING_CLASS_ABOVE */
 555   231,
 556   232, /* HB_UNICODE_COMBINING_CLASS_ABOVE_RIGHT */
 557   233, /* HB_UNICODE_COMBINING_CLASS_DOUBLE_BELOW */
 558   234, /* HB_UNICODE_COMBINING_CLASS_DOUBLE_ABOVE */
 559   235, 236, 237, 238, 239,
 560   240, /* HB_UNICODE_COMBINING_CLASS_IOTA_SUBSCRIPT */
 561   241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254,
 562   255, /* HB_UNICODE_COMBINING_CLASS_INVALID */
 563 };