1 /* 2 * Copyright 2007,2008,2009,2010 Red Hat, Inc. 3 * Copyright 2010,2012,2013 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 * Red Hat Author(s): Behdad Esfahbod 26 * Google Author(s): Behdad Esfahbod 27 */ 28 29 #ifndef HB_OT_LAYOUT_GSUB_TABLE_HH 30 #define HB_OT_LAYOUT_GSUB_TABLE_HH 31 32 #include "hb-ot-layout-gsubgpos-private.hh" 33 34 35 namespace OT { 36 37 38 struct SingleSubstFormat1 39 { 40 inline void closure (hb_closure_context_t *c) const 41 { 42 TRACE_CLOSURE (this); 43 Coverage::Iter iter; 44 for (iter.init (this+coverage); iter.more (); iter.next ()) { 45 hb_codepoint_t glyph_id = iter.get_glyph (); 46 if (c->glyphs->has (glyph_id)) 47 c->glyphs->add ((glyph_id + deltaGlyphID) & 0xFFFF); 48 } 49 } 50 51 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const 52 { 53 TRACE_COLLECT_GLYPHS (this); 54 Coverage::Iter iter; 55 for (iter.init (this+coverage); iter.more (); iter.next ()) { 56 hb_codepoint_t glyph_id = iter.get_glyph (); 57 c->input->add (glyph_id); 58 c->output->add ((glyph_id + deltaGlyphID) & 0xFFFF); 59 } 60 } 61 62 inline const Coverage &get_coverage (void) const 63 { 64 return this+coverage; 65 } 66 67 inline bool would_apply (hb_would_apply_context_t *c) const 68 { 69 TRACE_WOULD_APPLY (this); 70 return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED); 71 } 72 73 inline bool apply (hb_apply_context_t *c) const 74 { 75 TRACE_APPLY (this); 76 hb_codepoint_t glyph_id = c->buffer->cur().codepoint; 77 unsigned int index = (this+coverage).get_coverage (glyph_id); 78 if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); 79 80 /* According to the Adobe Annotated OpenType Suite, result is always 81 * limited to 16bit. */ 82 glyph_id = (glyph_id + deltaGlyphID) & 0xFFFF; 83 c->replace_glyph (glyph_id); 84 85 return TRACE_RETURN (true); 86 } 87 88 inline bool serialize (hb_serialize_context_t *c, 89 Supplier<GlyphID> &glyphs, 90 unsigned int num_glyphs, 91 int delta) 92 { 93 TRACE_SERIALIZE (this); 94 if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false); 95 if (unlikely (!coverage.serialize (c, this).serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false); 96 deltaGlyphID.set (delta); /* TODO(serilaize) overflow? */ 97 return TRACE_RETURN (true); 98 } 99 100 inline bool sanitize (hb_sanitize_context_t *c) { 101 TRACE_SANITIZE (this); 102 return TRACE_RETURN (coverage.sanitize (c, this) && deltaGlyphID.sanitize (c)); 103 } 104 105 protected: 106 USHORT format; /* Format identifier--format = 1 */ 107 OffsetTo<Coverage> 108 coverage; /* Offset to Coverage table--from 109 * beginning of Substitution table */ 110 SHORT deltaGlyphID; /* Add to original GlyphID to get 111 * substitute GlyphID */ 112 public: 113 DEFINE_SIZE_STATIC (6); 114 }; 115 116 struct SingleSubstFormat2 117 { 118 inline void closure (hb_closure_context_t *c) const 119 { 120 TRACE_CLOSURE (this); 121 Coverage::Iter iter; 122 for (iter.init (this+coverage); iter.more (); iter.next ()) { 123 if (c->glyphs->has (iter.get_glyph ())) 124 c->glyphs->add (substitute[iter.get_coverage ()]); 125 } 126 } 127 128 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const 129 { 130 TRACE_COLLECT_GLYPHS (this); 131 Coverage::Iter iter; 132 for (iter.init (this+coverage); iter.more (); iter.next ()) { 133 c->input->add (iter.get_glyph ()); 134 c->output->add (substitute[iter.get_coverage ()]); 135 } 136 } 137 138 inline const Coverage &get_coverage (void) const 139 { 140 return this+coverage; 141 } 142 143 inline bool would_apply (hb_would_apply_context_t *c) const 144 { 145 TRACE_WOULD_APPLY (this); 146 return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED); 147 } 148 149 inline bool apply (hb_apply_context_t *c) const 150 { 151 TRACE_APPLY (this); 152 hb_codepoint_t glyph_id = c->buffer->cur().codepoint; 153 unsigned int index = (this+coverage).get_coverage (glyph_id); 154 if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); 155 156 if (unlikely (index >= substitute.len)) return TRACE_RETURN (false); 157 158 glyph_id = substitute[index]; 159 c->replace_glyph (glyph_id); 160 161 return TRACE_RETURN (true); 162 } 163 164 inline bool serialize (hb_serialize_context_t *c, 165 Supplier<GlyphID> &glyphs, 166 Supplier<GlyphID> &substitutes, 167 unsigned int num_glyphs) 168 { 169 TRACE_SERIALIZE (this); 170 if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false); 171 if (unlikely (!substitute.serialize (c, substitutes, num_glyphs))) return TRACE_RETURN (false); 172 if (unlikely (!coverage.serialize (c, this).serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false); 173 return TRACE_RETURN (true); 174 } 175 176 inline bool sanitize (hb_sanitize_context_t *c) { 177 TRACE_SANITIZE (this); 178 return TRACE_RETURN (coverage.sanitize (c, this) && substitute.sanitize (c)); 179 } 180 181 protected: 182 USHORT format; /* Format identifier--format = 2 */ 183 OffsetTo<Coverage> 184 coverage; /* Offset to Coverage table--from 185 * beginning of Substitution table */ 186 ArrayOf<GlyphID> 187 substitute; /* Array of substitute 188 * GlyphIDs--ordered by Coverage Index */ 189 public: 190 DEFINE_SIZE_ARRAY (6, substitute); 191 }; 192 193 struct SingleSubst 194 { 195 inline bool serialize (hb_serialize_context_t *c, 196 Supplier<GlyphID> &glyphs, 197 Supplier<GlyphID> &substitutes, 198 unsigned int num_glyphs) 199 { 200 TRACE_SERIALIZE (this); 201 if (unlikely (!c->extend_min (u.format))) return TRACE_RETURN (false); 202 unsigned int format = 2; 203 int delta; 204 if (num_glyphs) { 205 format = 1; 206 /* TODO(serialize) check for wrap-around */ 207 delta = substitutes[0] - glyphs[0]; 208 for (unsigned int i = 1; i < num_glyphs; i++) 209 if (delta != substitutes[i] - glyphs[i]) { 210 format = 2; 211 break; 212 } 213 } 214 u.format.set (format); 215 switch (u.format) { 216 case 1: return TRACE_RETURN (u.format1.serialize (c, glyphs, num_glyphs, delta)); 217 case 2: return TRACE_RETURN (u.format2.serialize (c, glyphs, substitutes, num_glyphs)); 218 default:return TRACE_RETURN (false); 219 } 220 } 221 222 template <typename context_t> 223 inline typename context_t::return_t dispatch (context_t *c) const 224 { 225 TRACE_DISPATCH (this); 226 switch (u.format) { 227 case 1: return TRACE_RETURN (c->dispatch (u.format1)); 228 case 2: return TRACE_RETURN (c->dispatch (u.format2)); 229 default:return TRACE_RETURN (c->default_return_value ()); 230 } 231 } 232 233 inline bool sanitize (hb_sanitize_context_t *c) { 234 TRACE_SANITIZE (this); 235 if (!u.format.sanitize (c)) return TRACE_RETURN (false); 236 switch (u.format) { 237 case 1: return TRACE_RETURN (u.format1.sanitize (c)); 238 case 2: return TRACE_RETURN (u.format2.sanitize (c)); 239 default:return TRACE_RETURN (true); 240 } 241 } 242 243 protected: 244 union { 245 USHORT format; /* Format identifier */ 246 SingleSubstFormat1 format1; 247 SingleSubstFormat2 format2; 248 } u; 249 }; 250 251 252 struct Sequence 253 { 254 inline void closure (hb_closure_context_t *c) const 255 { 256 TRACE_CLOSURE (this); 257 unsigned int count = substitute.len; 258 for (unsigned int i = 0; i < count; i++) 259 c->glyphs->add (substitute[i]); 260 } 261 262 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const 263 { 264 TRACE_COLLECT_GLYPHS (this); 265 unsigned int count = substitute.len; 266 for (unsigned int i = 0; i < count; i++) 267 c->output->add (substitute[i]); 268 } 269 270 inline bool apply (hb_apply_context_t *c) const 271 { 272 TRACE_APPLY (this); 273 if (unlikely (!substitute.len)) return TRACE_RETURN (false); 274 275 unsigned int klass = _hb_glyph_info_is_ligature (&c->buffer->cur()) ? 276 HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH : 0; 277 unsigned int count = substitute.len; 278 if (count == 1) /* Special-case to make it in-place. */ 279 { 280 c->replace_glyph (substitute.array[0]); 281 } 282 else 283 { 284 for (unsigned int i = 0; i < count; i++) { 285 _hb_glyph_info_set_lig_props_for_component (&c->buffer->cur(), i); 286 c->output_glyph (substitute.array[i], klass); 287 } 288 c->buffer->skip_glyph (); 289 } 290 291 return TRACE_RETURN (true); 292 } 293 294 inline bool serialize (hb_serialize_context_t *c, 295 Supplier<GlyphID> &glyphs, 296 unsigned int num_glyphs) 297 { 298 TRACE_SERIALIZE (this); 299 if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false); 300 if (unlikely (!substitute.serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false); 301 return TRACE_RETURN (true); 302 } 303 304 inline bool sanitize (hb_sanitize_context_t *c) { 305 TRACE_SANITIZE (this); 306 return TRACE_RETURN (substitute.sanitize (c)); 307 } 308 309 protected: 310 ArrayOf<GlyphID> 311 substitute; /* String of GlyphIDs to substitute */ 312 public: 313 DEFINE_SIZE_ARRAY (2, substitute); 314 }; 315 316 struct MultipleSubstFormat1 317 { 318 inline void closure (hb_closure_context_t *c) const 319 { 320 TRACE_CLOSURE (this); 321 Coverage::Iter iter; 322 for (iter.init (this+coverage); iter.more (); iter.next ()) { 323 if (c->glyphs->has (iter.get_glyph ())) 324 (this+sequence[iter.get_coverage ()]).closure (c); 325 } 326 } 327 328 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const 329 { 330 TRACE_COLLECT_GLYPHS (this); 331 (this+coverage).add_coverage (c->input); 332 unsigned int count = sequence.len; 333 for (unsigned int i = 0; i < count; i++) 334 (this+sequence[i]).collect_glyphs (c); 335 } 336 337 inline const Coverage &get_coverage (void) const 338 { 339 return this+coverage; 340 } 341 342 inline bool would_apply (hb_would_apply_context_t *c) const 343 { 344 TRACE_WOULD_APPLY (this); 345 return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED); 346 } 347 348 inline bool apply (hb_apply_context_t *c) const 349 { 350 TRACE_APPLY (this); 351 352 unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint); 353 if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); 354 355 return TRACE_RETURN ((this+sequence[index]).apply (c)); 356 } 357 358 inline bool serialize (hb_serialize_context_t *c, 359 Supplier<GlyphID> &glyphs, 360 Supplier<unsigned int> &substitute_len_list, 361 unsigned int num_glyphs, 362 Supplier<GlyphID> &substitute_glyphs_list) 363 { 364 TRACE_SERIALIZE (this); 365 if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false); 366 if (unlikely (!sequence.serialize (c, num_glyphs))) return TRACE_RETURN (false); 367 for (unsigned int i = 0; i < num_glyphs; i++) 368 if (unlikely (!sequence[i].serialize (c, this).serialize (c, 369 substitute_glyphs_list, 370 substitute_len_list[i]))) return TRACE_RETURN (false); 371 substitute_len_list.advance (num_glyphs); 372 if (unlikely (!coverage.serialize (c, this).serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false); 373 return TRACE_RETURN (true); 374 } 375 376 inline bool sanitize (hb_sanitize_context_t *c) { 377 TRACE_SANITIZE (this); 378 return TRACE_RETURN (coverage.sanitize (c, this) && sequence.sanitize (c, this)); 379 } 380 381 protected: 382 USHORT format; /* Format identifier--format = 1 */ 383 OffsetTo<Coverage> 384 coverage; /* Offset to Coverage table--from 385 * beginning of Substitution table */ 386 OffsetArrayOf<Sequence> 387 sequence; /* Array of Sequence tables 388 * ordered by Coverage Index */ 389 public: 390 DEFINE_SIZE_ARRAY (6, sequence); 391 }; 392 393 struct MultipleSubst 394 { 395 inline bool serialize (hb_serialize_context_t *c, 396 Supplier<GlyphID> &glyphs, 397 Supplier<unsigned int> &substitute_len_list, 398 unsigned int num_glyphs, 399 Supplier<GlyphID> &substitute_glyphs_list) 400 { 401 TRACE_SERIALIZE (this); 402 if (unlikely (!c->extend_min (u.format))) return TRACE_RETURN (false); 403 unsigned int format = 1; 404 u.format.set (format); 405 switch (u.format) { 406 case 1: return TRACE_RETURN (u.format1.serialize (c, glyphs, substitute_len_list, num_glyphs, substitute_glyphs_list)); 407 default:return TRACE_RETURN (false); 408 } 409 } 410 411 template <typename context_t> 412 inline typename context_t::return_t dispatch (context_t *c) const 413 { 414 TRACE_DISPATCH (this); 415 switch (u.format) { 416 case 1: return TRACE_RETURN (c->dispatch (u.format1)); 417 default:return TRACE_RETURN (c->default_return_value ()); 418 } 419 } 420 421 inline bool sanitize (hb_sanitize_context_t *c) { 422 TRACE_SANITIZE (this); 423 if (!u.format.sanitize (c)) return TRACE_RETURN (false); 424 switch (u.format) { 425 case 1: return TRACE_RETURN (u.format1.sanitize (c)); 426 default:return TRACE_RETURN (true); 427 } 428 } 429 430 protected: 431 union { 432 USHORT format; /* Format identifier */ 433 MultipleSubstFormat1 format1; 434 } u; 435 }; 436 437 438 typedef ArrayOf<GlyphID> AlternateSet; /* Array of alternate GlyphIDs--in 439 * arbitrary order */ 440 441 struct AlternateSubstFormat1 442 { 443 inline void closure (hb_closure_context_t *c) const 444 { 445 TRACE_CLOSURE (this); 446 Coverage::Iter iter; 447 for (iter.init (this+coverage); iter.more (); iter.next ()) { 448 if (c->glyphs->has (iter.get_glyph ())) { 449 const AlternateSet &alt_set = this+alternateSet[iter.get_coverage ()]; 450 unsigned int count = alt_set.len; 451 for (unsigned int i = 0; i < count; i++) 452 c->glyphs->add (alt_set[i]); 453 } 454 } 455 } 456 457 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const 458 { 459 TRACE_COLLECT_GLYPHS (this); 460 Coverage::Iter iter; 461 for (iter.init (this+coverage); iter.more (); iter.next ()) { 462 c->input->add (iter.get_glyph ()); 463 const AlternateSet &alt_set = this+alternateSet[iter.get_coverage ()]; 464 unsigned int count = alt_set.len; 465 for (unsigned int i = 0; i < count; i++) 466 c->output->add (alt_set[i]); 467 } 468 } 469 470 inline const Coverage &get_coverage (void) const 471 { 472 return this+coverage; 473 } 474 475 inline bool would_apply (hb_would_apply_context_t *c) const 476 { 477 TRACE_WOULD_APPLY (this); 478 return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED); 479 } 480 481 inline bool apply (hb_apply_context_t *c) const 482 { 483 TRACE_APPLY (this); 484 hb_codepoint_t glyph_id = c->buffer->cur().codepoint; 485 486 unsigned int index = (this+coverage).get_coverage (glyph_id); 487 if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); 488 489 const AlternateSet &alt_set = this+alternateSet[index]; 490 491 if (unlikely (!alt_set.len)) return TRACE_RETURN (false); 492 493 hb_mask_t glyph_mask = c->buffer->cur().mask; 494 hb_mask_t lookup_mask = c->lookup_mask; 495 496 /* Note: This breaks badly if two features enabled this lookup together. */ 497 unsigned int shift = _hb_ctz (lookup_mask); 498 unsigned int alt_index = ((lookup_mask & glyph_mask) >> shift); 499 500 if (unlikely (alt_index > alt_set.len || alt_index == 0)) return TRACE_RETURN (false); 501 502 glyph_id = alt_set[alt_index - 1]; 503 504 c->replace_glyph (glyph_id); 505 506 return TRACE_RETURN (true); 507 } 508 509 inline bool serialize (hb_serialize_context_t *c, 510 Supplier<GlyphID> &glyphs, 511 Supplier<unsigned int> &alternate_len_list, 512 unsigned int num_glyphs, 513 Supplier<GlyphID> &alternate_glyphs_list) 514 { 515 TRACE_SERIALIZE (this); 516 if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false); 517 if (unlikely (!alternateSet.serialize (c, num_glyphs))) return TRACE_RETURN (false); 518 for (unsigned int i = 0; i < num_glyphs; i++) 519 if (unlikely (!alternateSet[i].serialize (c, this).serialize (c, 520 alternate_glyphs_list, 521 alternate_len_list[i]))) return TRACE_RETURN (false); 522 alternate_len_list.advance (num_glyphs); 523 if (unlikely (!coverage.serialize (c, this).serialize (c, glyphs, num_glyphs))) return TRACE_RETURN (false); 524 return TRACE_RETURN (true); 525 } 526 527 inline bool sanitize (hb_sanitize_context_t *c) { 528 TRACE_SANITIZE (this); 529 return TRACE_RETURN (coverage.sanitize (c, this) && alternateSet.sanitize (c, this)); 530 } 531 532 protected: 533 USHORT format; /* Format identifier--format = 1 */ 534 OffsetTo<Coverage> 535 coverage; /* Offset to Coverage table--from 536 * beginning of Substitution table */ 537 OffsetArrayOf<AlternateSet> 538 alternateSet; /* Array of AlternateSet tables 539 * ordered by Coverage Index */ 540 public: 541 DEFINE_SIZE_ARRAY (6, alternateSet); 542 }; 543 544 struct AlternateSubst 545 { 546 inline bool serialize (hb_serialize_context_t *c, 547 Supplier<GlyphID> &glyphs, 548 Supplier<unsigned int> &alternate_len_list, 549 unsigned int num_glyphs, 550 Supplier<GlyphID> &alternate_glyphs_list) 551 { 552 TRACE_SERIALIZE (this); 553 if (unlikely (!c->extend_min (u.format))) return TRACE_RETURN (false); 554 unsigned int format = 1; 555 u.format.set (format); 556 switch (u.format) { 557 case 1: return TRACE_RETURN (u.format1.serialize (c, glyphs, alternate_len_list, num_glyphs, alternate_glyphs_list)); 558 default:return TRACE_RETURN (false); 559 } 560 } 561 562 template <typename context_t> 563 inline typename context_t::return_t dispatch (context_t *c) const 564 { 565 TRACE_DISPATCH (this); 566 switch (u.format) { 567 case 1: return TRACE_RETURN (c->dispatch (u.format1)); 568 default:return TRACE_RETURN (c->default_return_value ()); 569 } 570 } 571 572 inline bool sanitize (hb_sanitize_context_t *c) { 573 TRACE_SANITIZE (this); 574 if (!u.format.sanitize (c)) return TRACE_RETURN (false); 575 switch (u.format) { 576 case 1: return TRACE_RETURN (u.format1.sanitize (c)); 577 default:return TRACE_RETURN (true); 578 } 579 } 580 581 protected: 582 union { 583 USHORT format; /* Format identifier */ 584 AlternateSubstFormat1 format1; 585 } u; 586 }; 587 588 589 struct Ligature 590 { 591 inline void closure (hb_closure_context_t *c) const 592 { 593 TRACE_CLOSURE (this); 594 unsigned int count = component.len; 595 for (unsigned int i = 1; i < count; i++) 596 if (!c->glyphs->has (component[i])) 597 return; 598 c->glyphs->add (ligGlyph); 599 } 600 601 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const 602 { 603 TRACE_COLLECT_GLYPHS (this); 604 unsigned int count = component.len; 605 for (unsigned int i = 1; i < count; i++) 606 c->input->add (component[i]); 607 c->output->add (ligGlyph); 608 } 609 610 inline bool would_apply (hb_would_apply_context_t *c) const 611 { 612 TRACE_WOULD_APPLY (this); 613 if (c->len != component.len) 614 return TRACE_RETURN (false); 615 616 for (unsigned int i = 1; i < c->len; i++) 617 if (likely (c->glyphs[i] != component[i])) 618 return TRACE_RETURN (false); 619 620 return TRACE_RETURN (true); 621 } 622 623 inline bool apply (hb_apply_context_t *c) const 624 { 625 TRACE_APPLY (this); 626 unsigned int count = component.len; 627 if (unlikely (count < 1)) return TRACE_RETURN (false); 628 629 bool is_mark_ligature = false; 630 unsigned int total_component_count = 0; 631 632 unsigned int match_length = 0; 633 unsigned int match_positions[MAX_CONTEXT_LENGTH]; 634 635 if (likely (!match_input (c, count, 636 &component[1], 637 match_glyph, 638 NULL, 639 &match_length, 640 match_positions, 641 &is_mark_ligature, 642 &total_component_count))) 643 return TRACE_RETURN (false); 644 645 ligate_input (c, 646 count, 647 match_positions, 648 match_length, 649 ligGlyph, 650 is_mark_ligature, 651 total_component_count); 652 653 return TRACE_RETURN (true); 654 } 655 656 inline bool serialize (hb_serialize_context_t *c, 657 GlyphID ligature, 658 Supplier<GlyphID> &components, /* Starting from second */ 659 unsigned int num_components /* Including first component */) 660 { 661 TRACE_SERIALIZE (this); 662 if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false); 663 ligGlyph = ligature; 664 if (unlikely (!component.serialize (c, components, num_components))) return TRACE_RETURN (false); 665 return TRACE_RETURN (true); 666 } 667 668 public: 669 inline bool sanitize (hb_sanitize_context_t *c) { 670 TRACE_SANITIZE (this); 671 return TRACE_RETURN (ligGlyph.sanitize (c) && component.sanitize (c)); 672 } 673 674 protected: 675 GlyphID ligGlyph; /* GlyphID of ligature to substitute */ 676 HeadlessArrayOf<GlyphID> 677 component; /* Array of component GlyphIDs--start 678 * with the second component--ordered 679 * in writing direction */ 680 public: 681 DEFINE_SIZE_ARRAY (4, component); 682 }; 683 684 struct LigatureSet 685 { 686 inline void closure (hb_closure_context_t *c) const 687 { 688 TRACE_CLOSURE (this); 689 unsigned int num_ligs = ligature.len; 690 for (unsigned int i = 0; i < num_ligs; i++) 691 (this+ligature[i]).closure (c); 692 } 693 694 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const 695 { 696 TRACE_COLLECT_GLYPHS (this); 697 unsigned int num_ligs = ligature.len; 698 for (unsigned int i = 0; i < num_ligs; i++) 699 (this+ligature[i]).collect_glyphs (c); 700 } 701 702 inline bool would_apply (hb_would_apply_context_t *c) const 703 { 704 TRACE_WOULD_APPLY (this); 705 unsigned int num_ligs = ligature.len; 706 for (unsigned int i = 0; i < num_ligs; i++) 707 { 708 const Ligature &lig = this+ligature[i]; 709 if (lig.would_apply (c)) 710 return TRACE_RETURN (true); 711 } 712 return TRACE_RETURN (false); 713 } 714 715 inline bool apply (hb_apply_context_t *c) const 716 { 717 TRACE_APPLY (this); 718 unsigned int num_ligs = ligature.len; 719 for (unsigned int i = 0; i < num_ligs; i++) 720 { 721 const Ligature &lig = this+ligature[i]; 722 if (lig.apply (c)) return TRACE_RETURN (true); 723 } 724 725 return TRACE_RETURN (false); 726 } 727 728 inline bool serialize (hb_serialize_context_t *c, 729 Supplier<GlyphID> &ligatures, 730 Supplier<unsigned int> &component_count_list, 731 unsigned int num_ligatures, 732 Supplier<GlyphID> &component_list /* Starting from second for each ligature */) 733 { 734 TRACE_SERIALIZE (this); 735 if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false); 736 if (unlikely (!ligature.serialize (c, num_ligatures))) return TRACE_RETURN (false); 737 for (unsigned int i = 0; i < num_ligatures; i++) 738 if (unlikely (!ligature[i].serialize (c, this).serialize (c, 739 ligatures[i], 740 component_list, 741 component_count_list[i]))) return TRACE_RETURN (false); 742 ligatures.advance (num_ligatures); 743 component_count_list.advance (num_ligatures); 744 return TRACE_RETURN (true); 745 } 746 747 inline bool sanitize (hb_sanitize_context_t *c) { 748 TRACE_SANITIZE (this); 749 return TRACE_RETURN (ligature.sanitize (c, this)); 750 } 751 752 protected: 753 OffsetArrayOf<Ligature> 754 ligature; /* Array LigatureSet tables 755 * ordered by preference */ 756 public: 757 DEFINE_SIZE_ARRAY (2, ligature); 758 }; 759 760 struct LigatureSubstFormat1 761 { 762 inline void closure (hb_closure_context_t *c) const 763 { 764 TRACE_CLOSURE (this); 765 Coverage::Iter iter; 766 for (iter.init (this+coverage); iter.more (); iter.next ()) { 767 if (c->glyphs->has (iter.get_glyph ())) 768 (this+ligatureSet[iter.get_coverage ()]).closure (c); 769 } 770 } 771 772 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const 773 { 774 TRACE_COLLECT_GLYPHS (this); 775 Coverage::Iter iter; 776 for (iter.init (this+coverage); iter.more (); iter.next ()) { 777 c->input->add (iter.get_glyph ()); 778 (this+ligatureSet[iter.get_coverage ()]).collect_glyphs (c); 779 } 780 } 781 782 inline const Coverage &get_coverage (void) const 783 { 784 return this+coverage; 785 } 786 787 inline bool would_apply (hb_would_apply_context_t *c) const 788 { 789 TRACE_WOULD_APPLY (this); 790 unsigned int index = (this+coverage).get_coverage (c->glyphs[0]); 791 if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); 792 793 const LigatureSet &lig_set = this+ligatureSet[index]; 794 return TRACE_RETURN (lig_set.would_apply (c)); 795 } 796 797 inline bool apply (hb_apply_context_t *c) const 798 { 799 TRACE_APPLY (this); 800 hb_codepoint_t glyph_id = c->buffer->cur().codepoint; 801 802 unsigned int index = (this+coverage).get_coverage (glyph_id); 803 if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); 804 805 const LigatureSet &lig_set = this+ligatureSet[index]; 806 return TRACE_RETURN (lig_set.apply (c)); 807 } 808 809 inline bool serialize (hb_serialize_context_t *c, 810 Supplier<GlyphID> &first_glyphs, 811 Supplier<unsigned int> &ligature_per_first_glyph_count_list, 812 unsigned int num_first_glyphs, 813 Supplier<GlyphID> &ligatures_list, 814 Supplier<unsigned int> &component_count_list, 815 Supplier<GlyphID> &component_list /* Starting from second for each ligature */) 816 { 817 TRACE_SERIALIZE (this); 818 if (unlikely (!c->extend_min (*this))) return TRACE_RETURN (false); 819 if (unlikely (!ligatureSet.serialize (c, num_first_glyphs))) return TRACE_RETURN (false); 820 for (unsigned int i = 0; i < num_first_glyphs; i++) 821 if (unlikely (!ligatureSet[i].serialize (c, this).serialize (c, 822 ligatures_list, 823 component_count_list, 824 ligature_per_first_glyph_count_list[i], 825 component_list))) return TRACE_RETURN (false); 826 ligature_per_first_glyph_count_list.advance (num_first_glyphs); 827 if (unlikely (!coverage.serialize (c, this).serialize (c, first_glyphs, num_first_glyphs))) return TRACE_RETURN (false); 828 return TRACE_RETURN (true); 829 } 830 831 inline bool sanitize (hb_sanitize_context_t *c) { 832 TRACE_SANITIZE (this); 833 return TRACE_RETURN (coverage.sanitize (c, this) && ligatureSet.sanitize (c, this)); 834 } 835 836 protected: 837 USHORT format; /* Format identifier--format = 1 */ 838 OffsetTo<Coverage> 839 coverage; /* Offset to Coverage table--from 840 * beginning of Substitution table */ 841 OffsetArrayOf<LigatureSet> 842 ligatureSet; /* Array LigatureSet tables 843 * ordered by Coverage Index */ 844 public: 845 DEFINE_SIZE_ARRAY (6, ligatureSet); 846 }; 847 848 struct LigatureSubst 849 { 850 inline bool serialize (hb_serialize_context_t *c, 851 Supplier<GlyphID> &first_glyphs, 852 Supplier<unsigned int> &ligature_per_first_glyph_count_list, 853 unsigned int num_first_glyphs, 854 Supplier<GlyphID> &ligatures_list, 855 Supplier<unsigned int> &component_count_list, 856 Supplier<GlyphID> &component_list /* Starting from second for each ligature */) 857 { 858 TRACE_SERIALIZE (this); 859 if (unlikely (!c->extend_min (u.format))) return TRACE_RETURN (false); 860 unsigned int format = 1; 861 u.format.set (format); 862 switch (u.format) { 863 case 1: return TRACE_RETURN (u.format1.serialize (c, first_glyphs, ligature_per_first_glyph_count_list, num_first_glyphs, 864 ligatures_list, component_count_list, component_list)); 865 default:return TRACE_RETURN (false); 866 } 867 } 868 869 template <typename context_t> 870 inline typename context_t::return_t dispatch (context_t *c) const 871 { 872 TRACE_DISPATCH (this); 873 switch (u.format) { 874 case 1: return TRACE_RETURN (c->dispatch (u.format1)); 875 default:return TRACE_RETURN (c->default_return_value ()); 876 } 877 } 878 879 inline bool sanitize (hb_sanitize_context_t *c) { 880 TRACE_SANITIZE (this); 881 if (!u.format.sanitize (c)) return TRACE_RETURN (false); 882 switch (u.format) { 883 case 1: return TRACE_RETURN (u.format1.sanitize (c)); 884 default:return TRACE_RETURN (true); 885 } 886 } 887 888 protected: 889 union { 890 USHORT format; /* Format identifier */ 891 LigatureSubstFormat1 format1; 892 } u; 893 }; 894 895 896 struct ContextSubst : Context {}; 897 898 struct ChainContextSubst : ChainContext {}; 899 900 struct ExtensionSubst : Extension<ExtensionSubst> 901 { 902 typedef struct SubstLookupSubTable LookupSubTable; 903 904 inline bool is_reverse (void) const; 905 }; 906 907 908 struct ReverseChainSingleSubstFormat1 909 { 910 inline void closure (hb_closure_context_t *c) const 911 { 912 TRACE_CLOSURE (this); 913 const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (backtrack); 914 915 unsigned int count; 916 917 count = backtrack.len; 918 for (unsigned int i = 0; i < count; i++) 919 if (!(this+backtrack[i]).intersects (c->glyphs)) 920 return; 921 922 count = lookahead.len; 923 for (unsigned int i = 0; i < count; i++) 924 if (!(this+lookahead[i]).intersects (c->glyphs)) 925 return; 926 927 const ArrayOf<GlyphID> &substitute = StructAfter<ArrayOf<GlyphID> > (lookahead); 928 Coverage::Iter iter; 929 for (iter.init (this+coverage); iter.more (); iter.next ()) { 930 if (c->glyphs->has (iter.get_glyph ())) 931 c->glyphs->add (substitute[iter.get_coverage ()]); 932 } 933 } 934 935 inline void collect_glyphs (hb_collect_glyphs_context_t *c) const 936 { 937 TRACE_COLLECT_GLYPHS (this); 938 939 const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (backtrack); 940 941 unsigned int count; 942 943 (this+coverage).add_coverage (c->input); 944 945 count = backtrack.len; 946 for (unsigned int i = 0; i < count; i++) 947 (this+backtrack[i]).add_coverage (c->before); 948 949 count = lookahead.len; 950 for (unsigned int i = 0; i < count; i++) 951 (this+lookahead[i]).add_coverage (c->after); 952 953 const ArrayOf<GlyphID> &substitute = StructAfter<ArrayOf<GlyphID> > (lookahead); 954 count = substitute.len; 955 for (unsigned int i = 0; i < count; i++) 956 c->output->add (substitute[i]); 957 } 958 959 inline const Coverage &get_coverage (void) const 960 { 961 return this+coverage; 962 } 963 964 inline bool would_apply (hb_would_apply_context_t *c) const 965 { 966 TRACE_WOULD_APPLY (this); 967 return TRACE_RETURN (c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED); 968 } 969 970 inline bool apply (hb_apply_context_t *c) const 971 { 972 TRACE_APPLY (this); 973 if (unlikely (c->nesting_level_left != MAX_NESTING_LEVEL)) 974 return TRACE_RETURN (false); /* No chaining to this type */ 975 976 unsigned int index = (this+coverage).get_coverage (c->buffer->cur().codepoint); 977 if (likely (index == NOT_COVERED)) return TRACE_RETURN (false); 978 979 const OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (backtrack); 980 const ArrayOf<GlyphID> &substitute = StructAfter<ArrayOf<GlyphID> > (lookahead); 981 982 if (match_backtrack (c, 983 backtrack.len, (USHORT *) backtrack.array, 984 match_coverage, this) && 985 match_lookahead (c, 986 lookahead.len, (USHORT *) lookahead.array, 987 match_coverage, this, 988 1)) 989 { 990 c->replace_glyph_inplace (substitute[index]); 991 /* Note: We DON'T decrease buffer->idx. The main loop does it 992 * for us. This is useful for preventing surprises if someone 993 * calls us through a Context lookup. */ 994 return TRACE_RETURN (true); 995 } 996 997 return TRACE_RETURN (false); 998 } 999 1000 inline bool sanitize (hb_sanitize_context_t *c) { 1001 TRACE_SANITIZE (this); 1002 if (!(coverage.sanitize (c, this) && backtrack.sanitize (c, this))) 1003 return TRACE_RETURN (false); 1004 OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (backtrack); 1005 if (!lookahead.sanitize (c, this)) 1006 return TRACE_RETURN (false); 1007 ArrayOf<GlyphID> &substitute = StructAfter<ArrayOf<GlyphID> > (lookahead); 1008 return TRACE_RETURN (substitute.sanitize (c)); 1009 } 1010 1011 protected: 1012 USHORT format; /* Format identifier--format = 1 */ 1013 OffsetTo<Coverage> 1014 coverage; /* Offset to Coverage table--from 1015 * beginning of table */ 1016 OffsetArrayOf<Coverage> 1017 backtrack; /* Array of coverage tables 1018 * in backtracking sequence, in glyph 1019 * sequence order */ 1020 OffsetArrayOf<Coverage> 1021 lookaheadX; /* Array of coverage tables 1022 * in lookahead sequence, in glyph 1023 * sequence order */ 1024 ArrayOf<GlyphID> 1025 substituteX; /* Array of substitute 1026 * GlyphIDs--ordered by Coverage Index */ 1027 public: 1028 DEFINE_SIZE_MIN (10); 1029 }; 1030 1031 struct ReverseChainSingleSubst 1032 { 1033 template <typename context_t> 1034 inline typename context_t::return_t dispatch (context_t *c) const 1035 { 1036 TRACE_DISPATCH (this); 1037 switch (u.format) { 1038 case 1: return TRACE_RETURN (c->dispatch (u.format1)); 1039 default:return TRACE_RETURN (c->default_return_value ()); 1040 } 1041 } 1042 1043 inline bool sanitize (hb_sanitize_context_t *c) { 1044 TRACE_SANITIZE (this); 1045 if (!u.format.sanitize (c)) return TRACE_RETURN (false); 1046 switch (u.format) { 1047 case 1: return TRACE_RETURN (u.format1.sanitize (c)); 1048 default:return TRACE_RETURN (true); 1049 } 1050 } 1051 1052 protected: 1053 union { 1054 USHORT format; /* Format identifier */ 1055 ReverseChainSingleSubstFormat1 format1; 1056 } u; 1057 }; 1058 1059 1060 1061 /* 1062 * SubstLookup 1063 */ 1064 1065 struct SubstLookupSubTable 1066 { 1067 friend struct SubstLookup; 1068 1069 enum Type { 1070 Single = 1, 1071 Multiple = 2, 1072 Alternate = 3, 1073 Ligature = 4, 1074 Context = 5, 1075 ChainContext = 6, 1076 Extension = 7, 1077 ReverseChainSingle = 8 1078 }; 1079 1080 template <typename context_t> 1081 inline typename context_t::return_t dispatch (context_t *c, unsigned int lookup_type) const 1082 { 1083 TRACE_DISPATCH (this); 1084 switch (lookup_type) { 1085 case Single: return TRACE_RETURN (u.single.dispatch (c)); 1086 case Multiple: return TRACE_RETURN (u.multiple.dispatch (c)); 1087 case Alternate: return TRACE_RETURN (u.alternate.dispatch (c)); 1088 case Ligature: return TRACE_RETURN (u.ligature.dispatch (c)); 1089 case Context: return TRACE_RETURN (u.context.dispatch (c)); 1090 case ChainContext: return TRACE_RETURN (u.chainContext.dispatch (c)); 1091 case Extension: return TRACE_RETURN (u.extension.dispatch (c)); 1092 case ReverseChainSingle: return TRACE_RETURN (u.reverseChainContextSingle.dispatch (c)); 1093 default: return TRACE_RETURN (c->default_return_value ()); 1094 } 1095 } 1096 1097 inline bool sanitize (hb_sanitize_context_t *c, unsigned int lookup_type) { 1098 TRACE_SANITIZE (this); 1099 if (!u.header.sub_format.sanitize (c)) 1100 return TRACE_RETURN (false); 1101 switch (lookup_type) { 1102 case Single: return TRACE_RETURN (u.single.sanitize (c)); 1103 case Multiple: return TRACE_RETURN (u.multiple.sanitize (c)); 1104 case Alternate: return TRACE_RETURN (u.alternate.sanitize (c)); 1105 case Ligature: return TRACE_RETURN (u.ligature.sanitize (c)); 1106 case Context: return TRACE_RETURN (u.context.sanitize (c)); 1107 case ChainContext: return TRACE_RETURN (u.chainContext.sanitize (c)); 1108 case Extension: return TRACE_RETURN (u.extension.sanitize (c)); 1109 case ReverseChainSingle: return TRACE_RETURN (u.reverseChainContextSingle.sanitize (c)); 1110 default: return TRACE_RETURN (true); 1111 } 1112 } 1113 1114 protected: 1115 union { 1116 struct { 1117 USHORT sub_format; 1118 } header; 1119 SingleSubst single; 1120 MultipleSubst multiple; 1121 AlternateSubst alternate; 1122 LigatureSubst ligature; 1123 ContextSubst context; 1124 ChainContextSubst chainContext; 1125 ExtensionSubst extension; 1126 ReverseChainSingleSubst reverseChainContextSingle; 1127 } u; 1128 public: 1129 DEFINE_SIZE_UNION (2, header.sub_format); 1130 }; 1131 1132 1133 struct SubstLookup : Lookup 1134 { 1135 inline const SubstLookupSubTable& get_subtable (unsigned int i) const 1136 { return this+CastR<OffsetArrayOf<SubstLookupSubTable> > (subTable)[i]; } 1137 1138 inline static bool lookup_type_is_reverse (unsigned int lookup_type) 1139 { return lookup_type == SubstLookupSubTable::ReverseChainSingle; } 1140 1141 inline bool is_reverse (void) const 1142 { 1143 unsigned int type = get_type (); 1144 if (unlikely (type == SubstLookupSubTable::Extension)) 1145 return CastR<ExtensionSubst> (get_subtable(0)).is_reverse (); 1146 return lookup_type_is_reverse (type); 1147 } 1148 1149 inline hb_closure_context_t::return_t closure (hb_closure_context_t *c) const 1150 { 1151 TRACE_CLOSURE (this); 1152 c->set_recurse_func (dispatch_recurse_func<hb_closure_context_t>); 1153 return TRACE_RETURN (dispatch (c)); 1154 } 1155 1156 inline hb_collect_glyphs_context_t::return_t collect_glyphs (hb_collect_glyphs_context_t *c) const 1157 { 1158 TRACE_COLLECT_GLYPHS (this); 1159 c->set_recurse_func (dispatch_recurse_func<hb_collect_glyphs_context_t>); 1160 return TRACE_RETURN (dispatch (c)); 1161 } 1162 1163 template <typename set_t> 1164 inline void add_coverage (set_t *glyphs) const 1165 { 1166 hb_get_coverage_context_t c; 1167 const Coverage *last = NULL; 1168 unsigned int count = get_subtable_count (); 1169 for (unsigned int i = 0; i < count; i++) { 1170 const Coverage *coverage = &get_subtable (i).dispatch (&c, get_type ()); 1171 if (coverage != last) { 1172 coverage->add_coverage (glyphs); 1173 last = coverage; 1174 } 1175 } 1176 } 1177 1178 inline bool would_apply (hb_would_apply_context_t *c, const hb_set_digest_t *digest) const 1179 { 1180 TRACE_WOULD_APPLY (this); 1181 if (unlikely (!c->len)) return TRACE_RETURN (false); 1182 if (!digest->may_have (c->glyphs[0])) return TRACE_RETURN (false); 1183 return TRACE_RETURN (dispatch (c)); 1184 } 1185 1186 inline bool apply_once (hb_apply_context_t *c) const 1187 { 1188 TRACE_APPLY (this); 1189 if (!c->check_glyph_property (&c->buffer->cur(), c->lookup_props)) 1190 return TRACE_RETURN (false); 1191 return TRACE_RETURN (dispatch (c)); 1192 } 1193 1194 static bool apply_recurse_func (hb_apply_context_t *c, unsigned int lookup_index); 1195 1196 inline SubstLookupSubTable& serialize_subtable (hb_serialize_context_t *c, 1197 unsigned int i) 1198 { return CastR<OffsetArrayOf<SubstLookupSubTable> > (subTable)[i].serialize (c, this); } 1199 1200 inline bool serialize_single (hb_serialize_context_t *c, 1201 uint32_t lookup_props, 1202 Supplier<GlyphID> &glyphs, 1203 Supplier<GlyphID> &substitutes, 1204 unsigned int num_glyphs) 1205 { 1206 TRACE_SERIALIZE (this); 1207 if (unlikely (!Lookup::serialize (c, SubstLookupSubTable::Single, lookup_props, 1))) return TRACE_RETURN (false); 1208 return TRACE_RETURN (serialize_subtable (c, 0).u.single.serialize (c, glyphs, substitutes, num_glyphs)); 1209 } 1210 1211 inline bool serialize_multiple (hb_serialize_context_t *c, 1212 uint32_t lookup_props, 1213 Supplier<GlyphID> &glyphs, 1214 Supplier<unsigned int> &substitute_len_list, 1215 unsigned int num_glyphs, 1216 Supplier<GlyphID> &substitute_glyphs_list) 1217 { 1218 TRACE_SERIALIZE (this); 1219 if (unlikely (!Lookup::serialize (c, SubstLookupSubTable::Multiple, lookup_props, 1))) return TRACE_RETURN (false); 1220 return TRACE_RETURN (serialize_subtable (c, 0).u.multiple.serialize (c, glyphs, substitute_len_list, num_glyphs, 1221 substitute_glyphs_list)); 1222 } 1223 1224 inline bool serialize_alternate (hb_serialize_context_t *c, 1225 uint32_t lookup_props, 1226 Supplier<GlyphID> &glyphs, 1227 Supplier<unsigned int> &alternate_len_list, 1228 unsigned int num_glyphs, 1229 Supplier<GlyphID> &alternate_glyphs_list) 1230 { 1231 TRACE_SERIALIZE (this); 1232 if (unlikely (!Lookup::serialize (c, SubstLookupSubTable::Alternate, lookup_props, 1))) return TRACE_RETURN (false); 1233 return TRACE_RETURN (serialize_subtable (c, 0).u.alternate.serialize (c, glyphs, alternate_len_list, num_glyphs, 1234 alternate_glyphs_list)); 1235 } 1236 1237 inline bool serialize_ligature (hb_serialize_context_t *c, 1238 uint32_t lookup_props, 1239 Supplier<GlyphID> &first_glyphs, 1240 Supplier<unsigned int> &ligature_per_first_glyph_count_list, 1241 unsigned int num_first_glyphs, 1242 Supplier<GlyphID> &ligatures_list, 1243 Supplier<unsigned int> &component_count_list, 1244 Supplier<GlyphID> &component_list /* Starting from second for each ligature */) 1245 { 1246 TRACE_SERIALIZE (this); 1247 if (unlikely (!Lookup::serialize (c, SubstLookupSubTable::Ligature, lookup_props, 1))) return TRACE_RETURN (false); 1248 return TRACE_RETURN (serialize_subtable (c, 0).u.ligature.serialize (c, first_glyphs, ligature_per_first_glyph_count_list, num_first_glyphs, 1249 ligatures_list, component_count_list, component_list)); 1250 } 1251 1252 template <typename context_t> 1253 static inline typename context_t::return_t dispatch_recurse_func (context_t *c, unsigned int lookup_index); 1254 1255 template <typename context_t> 1256 inline typename context_t::return_t dispatch (context_t *c) const 1257 { 1258 TRACE_DISPATCH (this); 1259 unsigned int lookup_type = get_type (); 1260 unsigned int count = get_subtable_count (); 1261 for (unsigned int i = 0; i < count; i++) { 1262 typename context_t::return_t r = get_subtable (i).dispatch (c, lookup_type); 1263 if (c->stop_sublookup_iteration (r)) 1264 return TRACE_RETURN (r); 1265 } 1266 return TRACE_RETURN (c->default_return_value ()); 1267 } 1268 1269 inline bool sanitize (hb_sanitize_context_t *c) 1270 { 1271 TRACE_SANITIZE (this); 1272 if (unlikely (!Lookup::sanitize (c))) return TRACE_RETURN (false); 1273 OffsetArrayOf<SubstLookupSubTable> &list = CastR<OffsetArrayOf<SubstLookupSubTable> > (subTable); 1274 if (unlikely (!list.sanitize (c, this, get_type ()))) return TRACE_RETURN (false); 1275 1276 if (unlikely (get_type () == SubstLookupSubTable::Extension)) 1277 { 1278 /* The spec says all subtables of an Extension lookup should 1279 * have the same type. This is specially important if one has 1280 * a reverse type! */ 1281 unsigned int type = get_subtable (0).u.extension.get_type (); 1282 unsigned int count = get_subtable_count (); 1283 for (unsigned int i = 1; i < count; i++) 1284 if (get_subtable (i).u.extension.get_type () != type) 1285 return TRACE_RETURN (false); 1286 } 1287 return TRACE_RETURN (true); 1288 } 1289 }; 1290 1291 typedef OffsetListOf<SubstLookup> SubstLookupList; 1292 1293 /* 1294 * GSUB -- The Glyph Substitution Table 1295 */ 1296 1297 struct GSUB : GSUBGPOS 1298 { 1299 static const hb_tag_t tableTag = HB_OT_TAG_GSUB; 1300 1301 inline const SubstLookup& get_lookup (unsigned int i) const 1302 { return CastR<SubstLookup> (GSUBGPOS::get_lookup (i)); } 1303 1304 static inline void substitute_start (hb_font_t *font, hb_buffer_t *buffer); 1305 static inline void substitute_finish (hb_font_t *font, hb_buffer_t *buffer); 1306 1307 inline bool sanitize (hb_sanitize_context_t *c) { 1308 TRACE_SANITIZE (this); 1309 if (unlikely (!GSUBGPOS::sanitize (c))) return TRACE_RETURN (false); 1310 OffsetTo<SubstLookupList> &list = CastR<OffsetTo<SubstLookupList> > (lookupList); 1311 return TRACE_RETURN (list.sanitize (c, this)); 1312 } 1313 public: 1314 DEFINE_SIZE_STATIC (10); 1315 }; 1316 1317 1318 void 1319 GSUB::substitute_start (hb_font_t *font, hb_buffer_t *buffer) 1320 { 1321 _hb_buffer_allocate_gsubgpos_vars (buffer); 1322 1323 const GDEF &gdef = *hb_ot_layout_from_face (font->face)->gdef; 1324 unsigned int count = buffer->len; 1325 for (unsigned int i = 0; i < count; i++) 1326 { 1327 _hb_glyph_info_set_glyph_props (&buffer->info[i], gdef.get_glyph_props (buffer->info[i].codepoint)); 1328 _hb_glyph_info_clear_lig_props (&buffer->info[i]); 1329 buffer->info[i].syllable() = 0; 1330 } 1331 } 1332 1333 void 1334 GSUB::substitute_finish (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer HB_UNUSED) 1335 { 1336 } 1337 1338 1339 /* Out-of-class implementation for methods recursing */ 1340 1341 inline bool ExtensionSubst::is_reverse (void) const 1342 { 1343 unsigned int type = get_type (); 1344 if (unlikely (type == SubstLookupSubTable::Extension)) 1345 return CastR<ExtensionSubst> (get_subtable<SubstLookupSubTable>()).is_reverse (); 1346 return SubstLookup::lookup_type_is_reverse (type); 1347 } 1348 1349 template <typename context_t> 1350 inline typename context_t::return_t SubstLookup::dispatch_recurse_func (context_t *c, unsigned int lookup_index) 1351 { 1352 const GSUB &gsub = *(hb_ot_layout_from_face (c->face)->gsub); 1353 const SubstLookup &l = gsub.get_lookup (lookup_index); 1354 return l.dispatch (c); 1355 } 1356 1357 inline bool SubstLookup::apply_recurse_func (hb_apply_context_t *c, unsigned int lookup_index) 1358 { 1359 const GSUB &gsub = *(hb_ot_layout_from_face (c->face)->gsub); 1360 const SubstLookup &l = gsub.get_lookup (lookup_index); 1361 unsigned int saved_lookup_props = c->lookup_props; 1362 c->set_lookup (l); 1363 bool ret = l.apply_once (c); 1364 c->lookup_props = saved_lookup_props; 1365 return ret; 1366 } 1367 1368 1369 } /* namespace OT */ 1370 1371 1372 #endif /* HB_OT_LAYOUT_GSUB_TABLE_HH */ 1373
