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

   1 /*
   2  * Copyright © 2009  Red Hat, Inc.
   3  * Copyright © 2012  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  * Red Hat Author(s): Behdad Esfahbod
  26  * Google Author(s): Behdad Esfahbod
  27  */
  28
  29 #include "hb-private.hh"
  30
  31 #include "hb-ot-layout-private.hh"
  32
  33 #include "hb-font-private.hh"
  34 #include "hb-blob.h"
  35 #include "hb-open-file-private.hh"
  36 #include "hb-ot-head-table.hh"
  37 #include "hb-ot-maxp-table.hh"
  38
  39 #include "hb-cache-private.hh"
  40
  41 #include <string.h>
  42
  43
  44
  45 /*
  46  * hb_font_funcs_t
  47  */
  48
  49 static hb_bool_t
  50 hb_font_get_glyph_nil (hb_font_t *font,
  51                        void *font_data HB_UNUSED,
  52                        hb_codepoint_t unicode,
  53                        hb_codepoint_t variation_selector,
  54                        hb_codepoint_t *glyph,
  55                        void *user_data HB_UNUSED)
  56 {
  57   if (font->parent)
  58     return font->parent->get_glyph (unicode, variation_selector, glyph);
  59
  60   *glyph = 0;
  61   return false;
  62 }
  63
  64 static hb_position_t
  65 hb_font_get_glyph_h_advance_nil (hb_font_t *font,
  66                                  void *font_data HB_UNUSED,
  67                                  hb_codepoint_t glyph,
  68                                  void *user_data HB_UNUSED)
  69 {
  70   if (font->parent)
  71     return font->parent_scale_x_distance (font->parent->get_glyph_h_advance (glyph));
  72
  73   return font->x_scale;
  74 }
  75
  76 static hb_position_t
  77 hb_font_get_glyph_v_advance_nil (hb_font_t *font,
  78                                  void *font_data HB_UNUSED,
  79                                  hb_codepoint_t glyph,
  80                                  void *user_data HB_UNUSED)
  81 {
  82   if (font->parent)
  83     return font->parent_scale_y_distance (font->parent->get_glyph_v_advance (glyph));
  84
  85   return font->y_scale;
  86 }
  87
  88 static hb_bool_t
  89 hb_font_get_glyph_h_origin_nil (hb_font_t *font,
  90                                 void *font_data HB_UNUSED,
  91                                 hb_codepoint_t glyph,
  92                                 hb_position_t *x,
  93                                 hb_position_t *y,
  94                                 void *user_data HB_UNUSED)
  95 {
  96   if (font->parent) {
  97     hb_bool_t ret = font->parent->get_glyph_h_origin (glyph, x, y);
  98     if (ret)
  99       font->parent_scale_position (x, y);
 100     return ret;
 101   }
 102
 103   *x = *y = 0;
 104   return false;
 105 }
 106
 107 static hb_bool_t
 108 hb_font_get_glyph_v_origin_nil (hb_font_t *font,
 109                                 void *font_data HB_UNUSED,
 110                                 hb_codepoint_t glyph,
 111                                 hb_position_t *x,
 112                                 hb_position_t *y,
 113                                 void *user_data HB_UNUSED)
 114 {
 115   if (font->parent) {
 116     hb_bool_t ret = font->parent->get_glyph_v_origin (glyph, x, y);
 117     if (ret)
 118       font->parent_scale_position (x, y);
 119     return ret;
 120   }
 121
 122   *x = *y = 0;
 123   return false;
 124 }
 125
 126 static hb_position_t
 127 hb_font_get_glyph_h_kerning_nil (hb_font_t *font,
 128                                  void *font_data HB_UNUSED,
 129                                  hb_codepoint_t left_glyph,
 130                                  hb_codepoint_t right_glyph,
 131                                  void *user_data HB_UNUSED)
 132 {
 133   if (font->parent)
 134     return font->parent_scale_x_distance (font->parent->get_glyph_h_kerning (left_glyph, right_glyph));
 135
 136   return 0;
 137 }
 138
 139 static hb_position_t
 140 hb_font_get_glyph_v_kerning_nil (hb_font_t *font,
 141                                  void *font_data HB_UNUSED,
 142                                  hb_codepoint_t top_glyph,
 143                                  hb_codepoint_t bottom_glyph,
 144                                  void *user_data HB_UNUSED)
 145 {
 146   if (font->parent)
 147     return font->parent_scale_y_distance (font->parent->get_glyph_v_kerning (top_glyph, bottom_glyph));
 148
 149   return 0;
 150 }
 151
 152 static hb_bool_t
 153 hb_font_get_glyph_extents_nil (hb_font_t *font,
 154                                void *font_data HB_UNUSED,
 155                                hb_codepoint_t glyph,
 156                                hb_glyph_extents_t *extents,
 157                                void *user_data HB_UNUSED)
 158 {
 159   if (font->parent) {
 160     hb_bool_t ret = font->parent->get_glyph_extents (glyph, extents);
 161     if (ret) {
 162       font->parent_scale_position (&extents->x_bearing, &extents->y_bearing);
 163       font->parent_scale_distance (&extents->width, &extents->height);
 164     }
 165     return ret;
 166   }
 167
 168   memset (extents, 0, sizeof (*extents));
 169   return false;
 170 }
 171
 172 static hb_bool_t
 173 hb_font_get_glyph_contour_point_nil (hb_font_t *font,
 174                                      void *font_data HB_UNUSED,
 175                                      hb_codepoint_t glyph,
 176                                      unsigned int point_index,
 177                                      hb_position_t *x,
 178                                      hb_position_t *y,
 179                                      void *user_data HB_UNUSED)
 180 {
 181   if (font->parent) {
 182     hb_bool_t ret = font->parent->get_glyph_contour_point (glyph, point_index, x, y);
 183     if (ret)
 184       font->parent_scale_position (x, y);
 185     return ret;
 186   }
 187
 188   *x = *y = 0;
 189   return false;
 190 }
 191
 192 static hb_bool_t
 193 hb_font_get_glyph_name_nil (hb_font_t *font,
 194                             void *font_data HB_UNUSED,
 195                             hb_codepoint_t glyph,
 196                             char *name, unsigned int size,
 197                             void *user_data HB_UNUSED)
 198 {
 199   if (font->parent)
 200     return font->parent->get_glyph_name (glyph, name, size);
 201
 202   if (size) *name = '\0';
 203   return false;
 204 }
 205
 206 static hb_bool_t
 207 hb_font_get_glyph_from_name_nil (hb_font_t *font,
 208                                  void *font_data HB_UNUSED,
 209                                  const char *name, int len, /* -1 means nul-terminated */
 210                                  hb_codepoint_t *glyph,
 211                                  void *user_data HB_UNUSED)
 212 {
 213   if (font->parent)
 214     return font->parent->get_glyph_from_name (name, len, glyph);
 215
 216   *glyph = 0;
 217   return false;
 218 }
 219
 220
 221 static const hb_font_funcs_t _hb_font_funcs_nil = {
 222   HB_OBJECT_HEADER_STATIC,
 223
 224   true, /* immutable */
 225
 226   {
 227 #define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_nil,
 228     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 229 #undef HB_FONT_FUNC_IMPLEMENT
 230   }
 231 };
 232
 233
 234 hb_font_funcs_t *
 235 hb_font_funcs_create (void)
 236 {
 237   hb_font_funcs_t *ffuncs;
 238
 239   if (!(ffuncs = hb_object_create<hb_font_funcs_t> ()))
 240     return hb_font_funcs_get_empty ();
 241
 242   ffuncs->get = _hb_font_funcs_nil.get;
 243
 244   return ffuncs;
 245 }
 246
 247 hb_font_funcs_t *
 248 hb_font_funcs_get_empty (void)
 249 {
 250   return const_cast<hb_font_funcs_t *> (&_hb_font_funcs_nil);
 251 }
 252
 253 hb_font_funcs_t *
 254 hb_font_funcs_reference (hb_font_funcs_t *ffuncs)
 255 {
 256   return hb_object_reference (ffuncs);
 257 }
 258
 259 void
 260 hb_font_funcs_destroy (hb_font_funcs_t *ffuncs)
 261 {
 262   if (!hb_object_destroy (ffuncs)) return;
 263
 264 #define HB_FONT_FUNC_IMPLEMENT(name) if (ffuncs->destroy.name) \
 265   ffuncs->destroy.name (ffuncs->user_data.name);
 266   HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 267 #undef HB_FONT_FUNC_IMPLEMENT
 268
 269   free (ffuncs);
 270 }
 271
 272 hb_bool_t
 273 hb_font_funcs_set_user_data (hb_font_funcs_t    *ffuncs,
 274                              hb_user_data_key_t *key,
 275                              void *              data,
 276                              hb_destroy_func_t   destroy,
 277                              hb_bool_t           replace)
 278 {
 279   return hb_object_set_user_data (ffuncs, key, data, destroy, replace);
 280 }
 281
 282 void *
 283 hb_font_funcs_get_user_data (hb_font_funcs_t    *ffuncs,
 284                              hb_user_data_key_t *key)
 285 {
 286   return hb_object_get_user_data (ffuncs, key);
 287 }
 288
 289
 290 void
 291 hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs)
 292 {
 293   if (hb_object_is_inert (ffuncs))
 294     return;
 295
 296   ffuncs->immutable = true;
 297 }
 298
 299 hb_bool_t
 300 hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs)
 301 {
 302   return ffuncs->immutable;
 303 }
 304
 305
 306 #define HB_FONT_FUNC_IMPLEMENT(name) \
 307                                                                          \
 308 void                                                                     \
 309 hb_font_funcs_set_##name##_func (hb_font_funcs_t             *ffuncs,    \
 310                                  hb_font_get_##name##_func_t  func,      \
 311                                  void                        *user_data, \
 312                                  hb_destroy_func_t            destroy)   \
 313 {                                                                        \
 314   if (ffuncs->immutable) {                                               \
 315     if (destroy)                                                         \
 316       destroy (user_data);                                               \
 317     return;                                                              \
 318   }                                                                      \
 319                                                                          \
 320   if (ffuncs->destroy.name)                                              \
 321     ffuncs->destroy.name (ffuncs->user_data.name);                       \
 322                                                                          \
 323   if (func) {                                                            \
 324     ffuncs->get.name = func;                                             \
 325     ffuncs->user_data.name = user_data;                                  \
 326     ffuncs->destroy.name = destroy;                                      \
 327   } else {                                                               \
 328     ffuncs->get.name = hb_font_get_##name##_nil;                         \
 329     ffuncs->user_data.name = NULL;                                       \
 330     ffuncs->destroy.name = NULL;                                         \
 331   }                                                                      \
 332 }
 333
 334 HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 335 #undef HB_FONT_FUNC_IMPLEMENT
 336
 337
 338 /* Public getters */
 339
 340 hb_bool_t
 341 hb_font_get_glyph (hb_font_t *font,
 342                    hb_codepoint_t unicode, hb_codepoint_t variation_selector,
 343                    hb_codepoint_t *glyph)
 344 {
 345   return font->get_glyph (unicode, variation_selector, glyph);
 346 }
 347
 348 hb_position_t
 349 hb_font_get_glyph_h_advance (hb_font_t *font,
 350                              hb_codepoint_t glyph)
 351 {
 352   return font->get_glyph_h_advance (glyph);
 353 }
 354
 355 hb_position_t
 356 hb_font_get_glyph_v_advance (hb_font_t *font,
 357                              hb_codepoint_t glyph)
 358 {
 359   return font->get_glyph_v_advance (glyph);
 360 }
 361
 362 hb_bool_t
 363 hb_font_get_glyph_h_origin (hb_font_t *font,
 364                             hb_codepoint_t glyph,
 365                             hb_position_t *x, hb_position_t *y)
 366 {
 367   return font->get_glyph_h_origin (glyph, x, y);
 368 }
 369
 370 hb_bool_t
 371 hb_font_get_glyph_v_origin (hb_font_t *font,
 372                             hb_codepoint_t glyph,
 373                             hb_position_t *x, hb_position_t *y)
 374 {
 375   return font->get_glyph_v_origin (glyph, x, y);
 376 }
 377
 378 hb_position_t
 379 hb_font_get_glyph_h_kerning (hb_font_t *font,
 380                              hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
 381 {
 382   return font->get_glyph_h_kerning (left_glyph, right_glyph);
 383 }
 384
 385 hb_position_t
 386 hb_font_get_glyph_v_kerning (hb_font_t *font,
 387                              hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
 388 {
 389   return font->get_glyph_v_kerning (left_glyph, right_glyph);
 390 }
 391
 392 hb_bool_t
 393 hb_font_get_glyph_extents (hb_font_t *font,
 394                            hb_codepoint_t glyph,
 395                            hb_glyph_extents_t *extents)
 396 {
 397   return font->get_glyph_extents (glyph, extents);
 398 }
 399
 400 hb_bool_t
 401 hb_font_get_glyph_contour_point (hb_font_t *font,
 402                                  hb_codepoint_t glyph, unsigned int point_index,
 403                                  hb_position_t *x, hb_position_t *y)
 404 {
 405   return font->get_glyph_contour_point (glyph, point_index, x, y);
 406 }
 407
 408 hb_bool_t
 409 hb_font_get_glyph_name (hb_font_t *font,
 410                         hb_codepoint_t glyph,
 411                         char *name, unsigned int size)
 412 {
 413   return font->get_glyph_name (glyph, name, size);
 414 }
 415
 416 hb_bool_t
 417 hb_font_get_glyph_from_name (hb_font_t *font,
 418                              const char *name, int len, /* -1 means nul-terminated */
 419                              hb_codepoint_t *glyph)
 420 {
 421   return font->get_glyph_from_name (name, len, glyph);
 422 }
 423
 424
 425 /* A bit higher-level, and with fallback */
 426
 427 void
 428 hb_font_get_glyph_advance_for_direction (hb_font_t *font,
 429                                          hb_codepoint_t glyph,
 430                                          hb_direction_t direction,
 431                                          hb_position_t *x, hb_position_t *y)
 432 {
 433   return font->get_glyph_advance_for_direction (glyph, direction, x, y);
 434 }
 435
 436 void
 437 hb_font_get_glyph_origin_for_direction (hb_font_t *font,
 438                                         hb_codepoint_t glyph,
 439                                         hb_direction_t direction,
 440                                         hb_position_t *x, hb_position_t *y)
 441 {
 442   return font->get_glyph_origin_for_direction (glyph, direction, x, y);
 443 }
 444
 445 void
 446 hb_font_add_glyph_origin_for_direction (hb_font_t *font,
 447                                         hb_codepoint_t glyph,
 448                                         hb_direction_t direction,
 449                                         hb_position_t *x, hb_position_t *y)
 450 {
 451   return font->add_glyph_origin_for_direction (glyph, direction, x, y);
 452 }
 453
 454 void
 455 hb_font_subtract_glyph_origin_for_direction (hb_font_t *font,
 456                                              hb_codepoint_t glyph,
 457                                              hb_direction_t direction,
 458                                              hb_position_t *x, hb_position_t *y)
 459 {
 460   return font->subtract_glyph_origin_for_direction (glyph, direction, x, y);
 461 }
 462
 463 void
 464 hb_font_get_glyph_kerning_for_direction (hb_font_t *font,
 465                                          hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
 466                                          hb_direction_t direction,
 467                                          hb_position_t *x, hb_position_t *y)
 468 {
 469   return font->get_glyph_kerning_for_direction (first_glyph, second_glyph, direction, x, y);
 470 }
 471
 472 hb_bool_t
 473 hb_font_get_glyph_extents_for_origin (hb_font_t *font,
 474                                       hb_codepoint_t glyph,
 475                                       hb_direction_t direction,
 476                                       hb_glyph_extents_t *extents)
 477 {
 478   return font->get_glyph_extents_for_origin (glyph, direction, extents);
 479 }
 480
 481 hb_bool_t
 482 hb_font_get_glyph_contour_point_for_origin (hb_font_t *font,
 483                                             hb_codepoint_t glyph, unsigned int point_index,
 484                                             hb_direction_t direction,
 485                                             hb_position_t *x, hb_position_t *y)
 486 {
 487   return font->get_glyph_contour_point_for_origin (glyph, point_index, direction, x, y);
 488 }
 489
 490 /* Generates gidDDD if glyph has no name. */
 491 void
 492 hb_font_glyph_to_string (hb_font_t *font,
 493                          hb_codepoint_t glyph,
 494                          char *s, unsigned int size)
 495 {
 496   font->glyph_to_string (glyph, s, size);
 497 }
 498
 499 /* Parses gidDDD and uniUUUU strings automatically. */
 500 hb_bool_t
 501 hb_font_glyph_from_string (hb_font_t *font,
 502                            const char *s, int len, /* -1 means nul-terminated */
 503                            hb_codepoint_t *glyph)
 504 {
 505   return font->glyph_from_string (s, len, glyph);
 506 }
 507
 508
 509 /*
 510  * hb_face_t
 511  */
 512
 513 static const hb_face_t _hb_face_nil = {
 514   HB_OBJECT_HEADER_STATIC,
 515
 516   true, /* immutable */
 517
 518   NULL, /* reference_table_func */
 519   NULL, /* user_data */
 520   NULL, /* destroy */
 521
 522   0,    /* index */
 523   1000, /* upem */
 524   0,    /* num_glyphs */
 525
 526   {
 527 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INVALID,
 528 #include "hb-shaper-list.hh"
 529 #undef HB_SHAPER_IMPLEMENT
 530   },
 531
 532   NULL, /* shape_plans */
 533 };
 534
 535
 536 hb_face_t *
 537 hb_face_create_for_tables (hb_reference_table_func_t  reference_table_func,
 538                            void                      *user_data,
 539                            hb_destroy_func_t          destroy)
 540 {
 541   hb_face_t *face;
 542
 543   if (!reference_table_func || !(face = hb_object_create<hb_face_t> ())) {
 544     if (destroy)
 545       destroy (user_data);
 546     return hb_face_get_empty ();
 547   }
 548
 549   face->reference_table_func = reference_table_func;
 550   face->user_data = user_data;
 551   face->destroy = destroy;
 552
 553   face->upem = 0;
 554   face->num_glyphs = (unsigned int) -1;
 555
 556   return face;
 557 }
 558
 559
 560 typedef struct hb_face_for_data_closure_t {
 561   hb_blob_t *blob;
 562   unsigned int  index;
 563 } hb_face_for_data_closure_t;
 564
 565 static hb_face_for_data_closure_t *
 566 _hb_face_for_data_closure_create (hb_blob_t *blob, unsigned int index)
 567 {
 568   hb_face_for_data_closure_t *closure;
 569
 570   closure = (hb_face_for_data_closure_t *) malloc (sizeof (hb_face_for_data_closure_t));
 571   if (unlikely (!closure))
 572     return NULL;
 573
 574   closure->blob = blob;
 575   closure->index = index;
 576
 577   return closure;
 578 }
 579
 580 static void
 581 _hb_face_for_data_closure_destroy (hb_face_for_data_closure_t *closure)
 582 {
 583   hb_blob_destroy (closure->blob);
 584   free (closure);
 585 }
 586
 587 static hb_blob_t *
 588 _hb_face_for_data_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
 589 {
 590   hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) user_data;
 591
 592   if (tag == HB_TAG_NONE)
 593     return hb_blob_reference (data->blob);
 594
 595   const OT::OpenTypeFontFile &ot_file = *OT::Sanitizer<OT::OpenTypeFontFile>::lock_instance (data->blob);
 596   const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index);
 597
 598   const OT::OpenTypeTable &table = ot_face.get_table_by_tag (tag);
 599
 600   hb_blob_t *blob = hb_blob_create_sub_blob (data->blob, table.offset, table.length);
 601
 602   return blob;
 603 }
 604
 605 hb_face_t *
 606 hb_face_create (hb_blob_t    *blob,
 607                 unsigned int  index)
 608 {
 609   hb_face_t *face;
 610
 611   if (unlikely (!blob || !hb_blob_get_length (blob)))
 612     return hb_face_get_empty ();
 613
 614   hb_face_for_data_closure_t *closure = _hb_face_for_data_closure_create (OT::Sanitizer<OT::OpenTypeFontFile>::sanitize (hb_blob_reference (blob)), index);
 615
 616   if (unlikely (!closure))
 617     return hb_face_get_empty ();
 618
 619   face = hb_face_create_for_tables (_hb_face_for_data_reference_table,
 620                                     closure,
 621                                     (hb_destroy_func_t) _hb_face_for_data_closure_destroy);
 622
 623   hb_face_set_index (face, index);
 624
 625   return face;
 626 }
 627
 628 hb_face_t *
 629 hb_face_get_empty (void)
 630 {
 631   return const_cast<hb_face_t *> (&_hb_face_nil);
 632 }
 633
 634
 635 hb_face_t *
 636 hb_face_reference (hb_face_t *face)
 637 {
 638   return hb_object_reference (face);
 639 }
 640
 641 void
 642 hb_face_destroy (hb_face_t *face)
 643 {
 644   if (!hb_object_destroy (face)) return;
 645
 646   for (hb_face_t::plan_node_t *node = face->shape_plans; node; )
 647   {
 648     hb_face_t::plan_node_t *next = node->next;
 649     hb_shape_plan_destroy (node->shape_plan);
 650     free (node);
 651     node = next;
 652   }
 653
 654 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_DESTROY(shaper, face);
 655 #include "hb-shaper-list.hh"
 656 #undef HB_SHAPER_IMPLEMENT
 657
 658   if (face->destroy)
 659     face->destroy (face->user_data);
 660
 661   free (face);
 662 }
 663
 664 hb_bool_t
 665 hb_face_set_user_data (hb_face_t          *face,
 666                        hb_user_data_key_t *key,
 667                        void *              data,
 668                        hb_destroy_func_t   destroy,
 669                        hb_bool_t           replace)
 670 {
 671   return hb_object_set_user_data (face, key, data, destroy, replace);
 672 }
 673
 674 void *
 675 hb_face_get_user_data (hb_face_t          *face,
 676                        hb_user_data_key_t *key)
 677 {
 678   return hb_object_get_user_data (face, key);
 679 }
 680
 681 void
 682 hb_face_make_immutable (hb_face_t *face)
 683 {
 684   if (hb_object_is_inert (face))
 685     return;
 686
 687   face->immutable = true;
 688 }
 689
 690 hb_bool_t
 691 hb_face_is_immutable (hb_face_t *face)
 692 {
 693   return face->immutable;
 694 }
 695
 696
 697 hb_blob_t *
 698 hb_face_reference_table (hb_face_t *face,
 699                          hb_tag_t   tag)
 700 {
 701   return face->reference_table (tag);
 702 }
 703
 704 hb_blob_t *
 705 hb_face_reference_blob (hb_face_t *face)
 706 {
 707   return face->reference_table (HB_TAG_NONE);
 708 }
 709
 710 void
 711 hb_face_set_index (hb_face_t    *face,
 712                    unsigned int  index)
 713 {
 714   if (hb_object_is_inert (face))
 715     return;
 716
 717   face->index = index;
 718 }
 719
 720 unsigned int
 721 hb_face_get_index (hb_face_t    *face)
 722 {
 723   return face->index;
 724 }
 725
 726 void
 727 hb_face_set_upem (hb_face_t    *face,
 728                   unsigned int  upem)
 729 {
 730   if (hb_object_is_inert (face))
 731     return;
 732
 733   face->upem = upem;
 734 }
 735
 736 unsigned int
 737 hb_face_get_upem (hb_face_t *face)
 738 {
 739   return face->get_upem ();
 740 }
 741
 742 void
 743 hb_face_t::load_upem (void) const
 744 {
 745   hb_blob_t *head_blob = OT::Sanitizer<OT::head>::sanitize (reference_table (HB_OT_TAG_head));
 746   const OT::head *head_table = OT::Sanitizer<OT::head>::lock_instance (head_blob);
 747   upem = head_table->get_upem ();
 748   hb_blob_destroy (head_blob);
 749 }
 750
 751 void
 752 hb_face_set_glyph_count (hb_face_t    *face,
 753                          unsigned int  glyph_count)
 754 {
 755   if (hb_object_is_inert (face))
 756     return;
 757
 758   face->num_glyphs = glyph_count;
 759 }
 760
 761 unsigned int
 762 hb_face_get_glyph_count (hb_face_t *face)
 763 {
 764   return face->get_num_glyphs ();
 765 }
 766
 767 void
 768 hb_face_t::load_num_glyphs (void) const
 769 {
 770   hb_blob_t *maxp_blob = OT::Sanitizer<OT::maxp>::sanitize (reference_table (HB_OT_TAG_maxp));
 771   const OT::maxp *maxp_table = OT::Sanitizer<OT::maxp>::lock_instance (maxp_blob);
 772   num_glyphs = maxp_table->get_num_glyphs ();
 773   hb_blob_destroy (maxp_blob);
 774 }
 775
 776
 777 /*
 778  * hb_font_t
 779  */
 780
 781 hb_font_t *
 782 hb_font_create (hb_face_t *face)
 783 {
 784   hb_font_t *font;
 785
 786   if (unlikely (!face))
 787     face = hb_face_get_empty ();
 788   if (unlikely (hb_object_is_inert (face)))
 789     return hb_font_get_empty ();
 790   if (!(font = hb_object_create<hb_font_t> ()))
 791     return hb_font_get_empty ();
 792
 793   hb_face_make_immutable (face);
 794   font->face = hb_face_reference (face);
 795   font->klass = hb_font_funcs_get_empty ();
 796
 797   return font;
 798 }
 799
 800 hb_font_t *
 801 hb_font_create_sub_font (hb_font_t *parent)
 802 {
 803   if (unlikely (!parent))
 804     return hb_font_get_empty ();
 805
 806   hb_font_t *font = hb_font_create (parent->face);
 807
 808   if (unlikely (hb_object_is_inert (font)))
 809     return font;
 810
 811   hb_font_make_immutable (parent);
 812   font->parent = hb_font_reference (parent);
 813
 814   font->x_scale = parent->x_scale;
 815   font->y_scale = parent->y_scale;
 816   font->x_ppem = parent->x_ppem;
 817   font->y_ppem = parent->y_ppem;
 818
 819   return font;
 820 }
 821
 822 hb_font_t *
 823 hb_font_get_empty (void)
 824 {
 825   static const hb_font_t _hb_font_nil = {
 826     HB_OBJECT_HEADER_STATIC,
 827
 828     true, /* immutable */
 829
 830     NULL, /* parent */
 831     const_cast<hb_face_t *> (&_hb_face_nil),
 832
 833     0, /* x_scale */
 834     0, /* y_scale */
 835
 836     0, /* x_ppem */
 837     0, /* y_ppem */
 838
 839     const_cast<hb_font_funcs_t *> (&_hb_font_funcs_nil), /* klass */
 840     NULL, /* user_data */
 841     NULL, /* destroy */
 842
 843     {
 844 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INVALID,
 845 #include "hb-shaper-list.hh"
 846 #undef HB_SHAPER_IMPLEMENT
 847     }
 848   };
 849
 850   return const_cast<hb_font_t *> (&_hb_font_nil);
 851 }
 852
 853 hb_font_t *
 854 hb_font_reference (hb_font_t *font)
 855 {
 856   return hb_object_reference (font);
 857 }
 858
 859 void
 860 hb_font_destroy (hb_font_t *font)
 861 {
 862   if (!hb_object_destroy (font)) return;
 863
 864 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_DESTROY(shaper, font);
 865 #include "hb-shaper-list.hh"
 866 #undef HB_SHAPER_IMPLEMENT
 867
 868   if (font->destroy)
 869     font->destroy (font->user_data);
 870
 871   hb_font_destroy (font->parent);
 872   hb_face_destroy (font->face);
 873   hb_font_funcs_destroy (font->klass);
 874
 875   free (font);
 876 }
 877
 878 hb_bool_t
 879 hb_font_set_user_data (hb_font_t          *font,
 880                        hb_user_data_key_t *key,
 881                        void *              data,
 882                        hb_destroy_func_t   destroy,
 883                        hb_bool_t           replace)
 884 {
 885   return hb_object_set_user_data (font, key, data, destroy, replace);
 886 }
 887
 888 void *
 889 hb_font_get_user_data (hb_font_t          *font,
 890                        hb_user_data_key_t *key)
 891 {
 892   return hb_object_get_user_data (font, key);
 893 }
 894
 895 void
 896 hb_font_make_immutable (hb_font_t *font)
 897 {
 898   if (hb_object_is_inert (font))
 899     return;
 900
 901   font->immutable = true;
 902 }
 903
 904 hb_bool_t
 905 hb_font_is_immutable (hb_font_t *font)
 906 {
 907   return font->immutable;
 908 }
 909
 910 hb_font_t *
 911 hb_font_get_parent (hb_font_t *font)
 912 {
 913   return font->parent;
 914 }
 915
 916 hb_face_t *
 917 hb_font_get_face (hb_font_t *font)
 918 {
 919   return font->face;
 920 }
 921
 922
 923 void
 924 hb_font_set_funcs (hb_font_t         *font,
 925                    hb_font_funcs_t   *klass,
 926                    void              *user_data,
 927                    hb_destroy_func_t  destroy)
 928 {
 929   if (font->immutable) {
 930     if (destroy)
 931       destroy (user_data);
 932     return;
 933   }
 934
 935   if (font->destroy)
 936     font->destroy (font->user_data);
 937
 938   if (!klass)
 939     klass = hb_font_funcs_get_empty ();
 940
 941   hb_font_funcs_reference (klass);
 942   hb_font_funcs_destroy (font->klass);
 943   font->klass = klass;
 944   font->user_data = user_data;
 945   font->destroy = destroy;
 946 }
 947
 948 void
 949 hb_font_set_funcs_data (hb_font_t         *font,
 950                         void              *user_data,
 951                         hb_destroy_func_t  destroy)
 952 {
 953   /* Destroy user_data? */
 954   if (font->immutable) {
 955     if (destroy)
 956       destroy (user_data);
 957     return;
 958   }
 959
 960   if (font->destroy)
 961     font->destroy (font->user_data);
 962
 963   font->user_data = user_data;
 964   font->destroy = destroy;
 965 }
 966
 967
 968 void
 969 hb_font_set_scale (hb_font_t *font,
 970                    int x_scale,
 971                    int y_scale)
 972 {
 973   if (font->immutable)
 974     return;
 975
 976   font->x_scale = x_scale;
 977   font->y_scale = y_scale;
 978 }
 979
 980 void
 981 hb_font_get_scale (hb_font_t *font,
 982                    int *x_scale,
 983                    int *y_scale)
 984 {
 985   if (x_scale) *x_scale = font->x_scale;
 986   if (y_scale) *y_scale = font->y_scale;
 987 }
 988
 989 void
 990 hb_font_set_ppem (hb_font_t *font,
 991                   unsigned int x_ppem,
 992                   unsigned int y_ppem)
 993 {
 994   if (font->immutable)
 995     return;
 996
 997   font->x_ppem = x_ppem;
 998   font->y_ppem = y_ppem;
 999 }
1000
1001 void
1002 hb_font_get_ppem (hb_font_t *font,
1003                   unsigned int *x_ppem,
1004                   unsigned int *y_ppem)
1005 {
1006   if (x_ppem) *x_ppem = font->x_ppem;
1007   if (y_ppem) *y_ppem = font->y_ppem;
1008 }