1 /* 2 * Copyright © 2015 Google, Inc. 3 * Copyright © 2019 Adobe Inc. 4 * Copyright © 2019 Ebrahim Byagowi 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 * Google Author(s): Behdad Esfahbod, Garret Rieger, Roderick Sheeter 27 * Adobe Author(s): Michiharu Ariza 28 */ 29 30 #ifndef HB_OT_GLYF_TABLE_HH 31 #define HB_OT_GLYF_TABLE_HH 32 33 #include "hb-open-type.hh" 34 #include "hb-ot-head-table.hh" 35 #include "hb-ot-hmtx-table.hh" 36 #include "hb-ot-var-gvar-table.hh" 37 #include "hb-draw.hh" 38 39 namespace OT { 40 41 42 /* 43 * loca -- Index to Location 44 * https://docs.microsoft.com/en-us/typography/opentype/spec/loca 45 */ 46 #define HB_OT_TAG_loca HB_TAG('l','o','c','a') 47 48 #ifndef HB_MAX_COMPOSITE_OPERATIONS 49 #define HB_MAX_COMPOSITE_OPERATIONS 100000 50 #endif 51 52 53 struct loca 54 { 55 friend struct glyf; 56 57 static constexpr hb_tag_t tableTag = HB_OT_TAG_loca; 58 sanitizeOT::loca59 bool sanitize (hb_sanitize_context_t *c HB_UNUSED) const 60 { 61 TRACE_SANITIZE (this); 62 return_trace (true); 63 } 64 65 protected: 66 UnsizedArrayOf<HBUINT8> 67 dataZ; /* Location data. */ 68 public: 69 DEFINE_SIZE_MIN (0); /* In reality, this is UNBOUNDED() type; but since we always 70 * check the size externally, allow Null() object of it by 71 * defining it _MIN instead. */ 72 }; 73 74 75 /* 76 * glyf -- TrueType Glyph Data 77 * https://docs.microsoft.com/en-us/typography/opentype/spec/glyf 78 */ 79 #define HB_OT_TAG_glyf HB_TAG('g','l','y','f') 80 81 82 struct glyf 83 { 84 static constexpr hb_tag_t tableTag = HB_OT_TAG_glyf; 85 sanitizeOT::glyf86 bool sanitize (hb_sanitize_context_t *c HB_UNUSED) const 87 { 88 TRACE_SANITIZE (this); 89 /* Runtime checks as eager sanitizing each glyph is costy */ 90 return_trace (true); 91 } 92 93 template<typename Iterator, 94 hb_requires (hb_is_source_of (Iterator, unsigned int))> 95 static bool _add_loca_and_headOT::glyf96 _add_loca_and_head (hb_subset_plan_t * plan, Iterator padded_offsets, bool use_short_loca) 97 { 98 unsigned num_offsets = padded_offsets.len () + 1; 99 unsigned entry_size = use_short_loca ? 2 : 4; 100 char *loca_prime_data = (char *) hb_calloc (entry_size, num_offsets); 101 102 if (unlikely (!loca_prime_data)) return false; 103 104 DEBUG_MSG (SUBSET, nullptr, "loca entry_size %d num_offsets %d size %d", 105 entry_size, num_offsets, entry_size * num_offsets); 106 107 if (use_short_loca) 108 _write_loca (padded_offsets, 1, hb_array ((HBUINT16 *) loca_prime_data, num_offsets)); 109 else 110 _write_loca (padded_offsets, 0, hb_array ((HBUINT32 *) loca_prime_data, num_offsets)); 111 112 hb_blob_t *loca_blob = hb_blob_create (loca_prime_data, 113 entry_size * num_offsets, 114 HB_MEMORY_MODE_WRITABLE, 115 loca_prime_data, 116 hb_free); 117 118 bool result = plan->add_table (HB_OT_TAG_loca, loca_blob) 119 && _add_head_and_set_loca_version (plan, use_short_loca); 120 121 hb_blob_destroy (loca_blob); 122 return result; 123 } 124 125 template<typename IteratorIn, typename IteratorOut, 126 hb_requires (hb_is_source_of (IteratorIn, unsigned int)), 127 hb_requires (hb_is_sink_of (IteratorOut, unsigned))> 128 static void _write_locaOT::glyf129 _write_loca (IteratorIn it, unsigned right_shift, IteratorOut dest) 130 { 131 unsigned int offset = 0; 132 dest << 0; 133 + it 134 | hb_map ([=, &offset] (unsigned int padded_size) 135 { 136 offset += padded_size; 137 DEBUG_MSG (SUBSET, nullptr, "loca entry offset %d", offset); 138 return offset >> right_shift; 139 }) 140 | hb_sink (dest) 141 ; 142 } 143 144 /* requires source of SubsetGlyph complains the identifier isn't declared */ 145 template <typename Iterator> serializeOT::glyf146 bool serialize (hb_serialize_context_t *c, 147 Iterator it, 148 bool use_short_loca, 149 const hb_subset_plan_t *plan) 150 { 151 TRACE_SERIALIZE (this); 152 unsigned init_len = c->length (); 153 for (const auto &_ : it) _.serialize (c, use_short_loca, plan); 154 155 /* As a special case when all glyph in the font are empty, add a zero byte 156 * to the table, so that OTS doesn’t reject it, and to make the table work 157 * on Windows as well. 158 * See https://github.com/khaledhosny/ots/issues/52 */ 159 if (init_len == c->length ()) 160 { 161 HBUINT8 empty_byte; 162 empty_byte = 0; 163 c->copy (empty_byte); 164 } 165 return_trace (true); 166 } 167 168 /* Byte region(s) per glyph to output 169 unpadded, hints removed if so requested 170 If we fail to process a glyph we produce an empty (0-length) glyph */ subsetOT::glyf171 bool subset (hb_subset_context_t *c) const 172 { 173 TRACE_SUBSET (this); 174 175 glyf *glyf_prime = c->serializer->start_embed <glyf> (); 176 if (unlikely (!c->serializer->check_success (glyf_prime))) return_trace (false); 177 178 hb_vector_t<SubsetGlyph> glyphs; 179 _populate_subset_glyphs (c->plan, &glyphs); 180 181 auto padded_offsets = 182 + hb_iter (glyphs) 183 | hb_map (&SubsetGlyph::padded_size) 184 ; 185 186 unsigned max_offset = + padded_offsets | hb_reduce (hb_add, 0); 187 bool use_short_loca = max_offset < 0x1FFFF; 188 189 190 glyf_prime->serialize (c->serializer, hb_iter (glyphs), use_short_loca, c->plan); 191 if (!use_short_loca) { 192 padded_offsets = 193 + hb_iter (glyphs) 194 | hb_map (&SubsetGlyph::length) 195 ; 196 } 197 198 199 if (unlikely (c->serializer->in_error ())) return_trace (false); 200 return_trace (c->serializer->check_success (_add_loca_and_head (c->plan, 201 padded_offsets, 202 use_short_loca))); 203 } 204 205 template <typename SubsetGlyph> 206 void _populate_subset_glyphsOT::glyf207 _populate_subset_glyphs (const hb_subset_plan_t *plan, 208 hb_vector_t<SubsetGlyph> *glyphs /* OUT */) const 209 { 210 OT::glyf::accelerator_t glyf (plan->source); 211 212 + hb_range (plan->num_output_glyphs ()) 213 | hb_map ([&] (hb_codepoint_t new_gid) 214 { 215 SubsetGlyph subset_glyph = {0}; 216 subset_glyph.new_gid = new_gid; 217 218 /* should never fail: all old gids should be mapped */ 219 if (!plan->old_gid_for_new_gid (new_gid, &subset_glyph.old_gid)) 220 return subset_glyph; 221 222 if (new_gid == 0 && 223 !(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)) 224 subset_glyph.source_glyph = Glyph (); 225 else 226 subset_glyph.source_glyph = glyf.glyph_for_gid (subset_glyph.old_gid, true); 227 if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING) 228 subset_glyph.drop_hints_bytes (); 229 else 230 subset_glyph.dest_start = subset_glyph.source_glyph.get_bytes (); 231 return subset_glyph; 232 }) 233 | hb_sink (glyphs) 234 ; 235 } 236 237 static bool _add_head_and_set_loca_versionOT::glyf238 _add_head_and_set_loca_version (hb_subset_plan_t *plan, bool use_short_loca) 239 { 240 hb_blob_t *head_blob = hb_sanitize_context_t ().reference_table<head> (plan->source); 241 hb_blob_t *head_prime_blob = hb_blob_copy_writable_or_fail (head_blob); 242 hb_blob_destroy (head_blob); 243 244 if (unlikely (!head_prime_blob)) 245 return false; 246 247 head *head_prime = (head *) hb_blob_get_data_writable (head_prime_blob, nullptr); 248 head_prime->indexToLocFormat = use_short_loca ? 0 : 1; 249 bool success = plan->add_table (HB_OT_TAG_head, head_prime_blob); 250 251 hb_blob_destroy (head_prime_blob); 252 return success; 253 } 254 255 struct CompositeGlyphChain 256 { 257 protected: 258 enum composite_glyph_flag_t 259 { 260 ARG_1_AND_2_ARE_WORDS = 0x0001, 261 ARGS_ARE_XY_VALUES = 0x0002, 262 ROUND_XY_TO_GRID = 0x0004, 263 WE_HAVE_A_SCALE = 0x0008, 264 MORE_COMPONENTS = 0x0020, 265 WE_HAVE_AN_X_AND_Y_SCALE = 0x0040, 266 WE_HAVE_A_TWO_BY_TWO = 0x0080, 267 WE_HAVE_INSTRUCTIONS = 0x0100, 268 USE_MY_METRICS = 0x0200, 269 OVERLAP_COMPOUND = 0x0400, 270 SCALED_COMPONENT_OFFSET = 0x0800, 271 UNSCALED_COMPONENT_OFFSET = 0x1000 272 }; 273 274 public: get_sizeOT::glyf::CompositeGlyphChain275 unsigned int get_size () const 276 { 277 unsigned int size = min_size; 278 /* arg1 and 2 are int16 */ 279 if (flags & ARG_1_AND_2_ARE_WORDS) size += 4; 280 /* arg1 and 2 are int8 */ 281 else size += 2; 282 283 /* One x 16 bit (scale) */ 284 if (flags & WE_HAVE_A_SCALE) size += 2; 285 /* Two x 16 bit (xscale, yscale) */ 286 else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) size += 4; 287 /* Four x 16 bit (xscale, scale01, scale10, yscale) */ 288 else if (flags & WE_HAVE_A_TWO_BY_TWO) size += 8; 289 290 return size; 291 } 292 set_glyph_indexOT::glyf::CompositeGlyphChain293 void set_glyph_index (hb_codepoint_t new_gid) { glyphIndex = new_gid; } get_glyph_indexOT::glyf::CompositeGlyphChain294 hb_codepoint_t get_glyph_index () const { return glyphIndex; } 295 drop_instructions_flagOT::glyf::CompositeGlyphChain296 void drop_instructions_flag () { flags = (uint16_t) flags & ~WE_HAVE_INSTRUCTIONS; } set_overlaps_flagOT::glyf::CompositeGlyphChain297 void set_overlaps_flag () 298 { 299 flags = (uint16_t) flags | OVERLAP_COMPOUND; 300 } 301 has_instructionsOT::glyf::CompositeGlyphChain302 bool has_instructions () const { return flags & WE_HAVE_INSTRUCTIONS; } 303 has_moreOT::glyf::CompositeGlyphChain304 bool has_more () const { return flags & MORE_COMPONENTS; } is_use_my_metricsOT::glyf::CompositeGlyphChain305 bool is_use_my_metrics () const { return flags & USE_MY_METRICS; } is_anchoredOT::glyf::CompositeGlyphChain306 bool is_anchored () const { return !(flags & ARGS_ARE_XY_VALUES); } get_anchor_pointsOT::glyf::CompositeGlyphChain307 void get_anchor_points (unsigned int &point1, unsigned int &point2) const 308 { 309 const HBUINT8 *p = &StructAfter<const HBUINT8> (glyphIndex); 310 if (flags & ARG_1_AND_2_ARE_WORDS) 311 { 312 point1 = ((const HBUINT16 *) p)[0]; 313 point2 = ((const HBUINT16 *) p)[1]; 314 } 315 else 316 { 317 point1 = p[0]; 318 point2 = p[1]; 319 } 320 } 321 transform_pointsOT::glyf::CompositeGlyphChain322 void transform_points (contour_point_vector_t &points) const 323 { 324 float matrix[4]; 325 contour_point_t trans; 326 if (get_transformation (matrix, trans)) 327 { 328 if (scaled_offsets ()) 329 { 330 points.translate (trans); 331 points.transform (matrix); 332 } 333 else 334 { 335 points.transform (matrix); 336 points.translate (trans); 337 } 338 } 339 } 340 341 protected: scaled_offsetsOT::glyf::CompositeGlyphChain342 bool scaled_offsets () const 343 { return (flags & (SCALED_COMPONENT_OFFSET | UNSCALED_COMPONENT_OFFSET)) == SCALED_COMPONENT_OFFSET; } 344 get_transformationOT::glyf::CompositeGlyphChain345 bool get_transformation (float (&matrix)[4], contour_point_t &trans) const 346 { 347 matrix[0] = matrix[3] = 1.f; 348 matrix[1] = matrix[2] = 0.f; 349 350 int tx, ty; 351 const HBINT8 *p = &StructAfter<const HBINT8> (glyphIndex); 352 if (flags & ARG_1_AND_2_ARE_WORDS) 353 { 354 tx = *(const HBINT16 *) p; 355 p += HBINT16::static_size; 356 ty = *(const HBINT16 *) p; 357 p += HBINT16::static_size; 358 } 359 else 360 { 361 tx = *p++; 362 ty = *p++; 363 } 364 if (is_anchored ()) tx = ty = 0; 365 366 trans.init ((float) tx, (float) ty); 367 368 { 369 const F2DOT14 *points = (const F2DOT14 *) p; 370 if (flags & WE_HAVE_A_SCALE) 371 { 372 matrix[0] = matrix[3] = points[0].to_float (); 373 return true; 374 } 375 else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) 376 { 377 matrix[0] = points[0].to_float (); 378 matrix[3] = points[1].to_float (); 379 return true; 380 } 381 else if (flags & WE_HAVE_A_TWO_BY_TWO) 382 { 383 matrix[0] = points[0].to_float (); 384 matrix[1] = points[1].to_float (); 385 matrix[2] = points[2].to_float (); 386 matrix[3] = points[3].to_float (); 387 return true; 388 } 389 } 390 return tx || ty; 391 } 392 393 protected: 394 HBUINT16 flags; 395 HBGlyphID16 glyphIndex; 396 public: 397 DEFINE_SIZE_MIN (4); 398 }; 399 400 struct composite_iter_t : hb_iter_with_fallback_t<composite_iter_t, const CompositeGlyphChain &> 401 { 402 typedef const CompositeGlyphChain *__item_t__; composite_iter_tOT::glyf::composite_iter_t403 composite_iter_t (hb_bytes_t glyph_, __item_t__ current_) : 404 glyph (glyph_), current (nullptr), current_size (0) 405 { 406 set_next (current_); 407 } 408 composite_iter_tOT::glyf::composite_iter_t409 composite_iter_t () : glyph (hb_bytes_t ()), current (nullptr), current_size (0) {} 410 __item__OT::glyf::composite_iter_t411 const CompositeGlyphChain &__item__ () const { return *current; } __more__OT::glyf::composite_iter_t412 bool __more__ () const { return current; } __next__OT::glyf::composite_iter_t413 void __next__ () 414 { 415 if (!current->has_more ()) { current = nullptr; return; } 416 417 set_next (&StructAtOffset<CompositeGlyphChain> (current, current_size)); 418 } operator !=OT::glyf::composite_iter_t419 bool operator != (const composite_iter_t& o) const 420 { return glyph != o.glyph || current != o.current; } 421 422 set_nextOT::glyf::composite_iter_t423 void set_next (const CompositeGlyphChain *composite) 424 { 425 if (!glyph.check_range (composite, CompositeGlyphChain::min_size)) 426 { 427 current = nullptr; 428 current_size = 0; 429 return; 430 } 431 unsigned size = composite->get_size (); 432 if (!glyph.check_range (composite, size)) 433 { 434 current = nullptr; 435 current_size = 0; 436 return; 437 } 438 439 current = composite; 440 current_size = size; 441 } 442 443 private: 444 hb_bytes_t glyph; 445 __item_t__ current; 446 unsigned current_size; 447 }; 448 449 enum phantom_point_index_t 450 { 451 PHANTOM_LEFT = 0, 452 PHANTOM_RIGHT = 1, 453 PHANTOM_TOP = 2, 454 PHANTOM_BOTTOM = 3, 455 PHANTOM_COUNT = 4 456 }; 457 458 struct accelerator_t; 459 460 struct Glyph 461 { 462 enum simple_glyph_flag_t 463 { 464 FLAG_ON_CURVE = 0x01, 465 FLAG_X_SHORT = 0x02, 466 FLAG_Y_SHORT = 0x04, 467 FLAG_REPEAT = 0x08, 468 FLAG_X_SAME = 0x10, 469 FLAG_Y_SAME = 0x20, 470 FLAG_OVERLAP_SIMPLE = 0x40, 471 FLAG_RESERVED2 = 0x80 472 }; 473 474 private: 475 struct GlyphHeader 476 { has_dataOT::glyf::Glyph::GlyphHeader477 bool has_data () const { return numberOfContours; } 478 get_extentsOT::glyf::Glyph::GlyphHeader479 bool get_extents (hb_font_t *font, const accelerator_t &glyf_accelerator, 480 hb_codepoint_t gid, hb_glyph_extents_t *extents) const 481 { 482 /* Undocumented rasterizer behavior: shift glyph to the left by (lsb - xMin), i.e., xMin = lsb */ 483 /* extents->x_bearing = hb_min (glyph_header.xMin, glyph_header.xMax); */ 484 extents->x_bearing = font->em_scale_x (glyf_accelerator.hmtx->get_side_bearing (gid)); 485 extents->y_bearing = font->em_scale_y (hb_max (yMin, yMax)); 486 extents->width = font->em_scale_x (hb_max (xMin, xMax) - hb_min (xMin, xMax)); 487 extents->height = font->em_scale_y (hb_min (yMin, yMax) - hb_max (yMin, yMax)); 488 489 return true; 490 } 491 492 HBINT16 numberOfContours; 493 /* If the number of contours is 494 * greater than or equal to zero, 495 * this is a simple glyph; if negative, 496 * this is a composite glyph. */ 497 FWORD xMin; /* Minimum x for coordinate data. */ 498 FWORD yMin; /* Minimum y for coordinate data. */ 499 FWORD xMax; /* Maximum x for coordinate data. */ 500 FWORD yMax; /* Maximum y for coordinate data. */ 501 public: 502 DEFINE_SIZE_STATIC (10); 503 }; 504 505 struct SimpleGlyph 506 { 507 const GlyphHeader &header; 508 hb_bytes_t bytes; SimpleGlyphOT::glyf::Glyph::SimpleGlyph509 SimpleGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) : 510 header (header_), bytes (bytes_) {} 511 instruction_len_offsetOT::glyf::Glyph::SimpleGlyph512 unsigned int instruction_len_offset () const 513 { return GlyphHeader::static_size + 2 * header.numberOfContours; } 514 lengthOT::glyf::Glyph::SimpleGlyph515 unsigned int length (unsigned int instruction_len) const 516 { return instruction_len_offset () + 2 + instruction_len; } 517 instructions_lengthOT::glyf::Glyph::SimpleGlyph518 unsigned int instructions_length () const 519 { 520 unsigned int instruction_length_offset = instruction_len_offset (); 521 if (unlikely (instruction_length_offset + 2 > bytes.length)) return 0; 522 523 const HBUINT16 &instructionLength = StructAtOffset<HBUINT16> (&bytes, instruction_length_offset); 524 /* Out of bounds of the current glyph */ 525 if (unlikely (length (instructionLength) > bytes.length)) return 0; 526 return instructionLength; 527 } 528 trim_paddingOT::glyf::Glyph::SimpleGlyph529 const Glyph trim_padding () const 530 { 531 /* based on FontTools _g_l_y_f.py::trim */ 532 const uint8_t *glyph = (uint8_t*) bytes.arrayZ; 533 const uint8_t *glyph_end = glyph + bytes.length; 534 /* simple glyph w/contours, possibly trimmable */ 535 glyph += instruction_len_offset (); 536 537 if (unlikely (glyph + 2 >= glyph_end)) return Glyph (); 538 unsigned int num_coordinates = StructAtOffset<HBUINT16> (glyph - 2, 0) + 1; 539 unsigned int num_instructions = StructAtOffset<HBUINT16> (glyph, 0); 540 541 glyph += 2 + num_instructions; 542 543 unsigned int coord_bytes = 0; 544 unsigned int coords_with_flags = 0; 545 while (glyph < glyph_end) 546 { 547 uint8_t flag = *glyph; 548 glyph++; 549 550 unsigned int repeat = 1; 551 if (flag & FLAG_REPEAT) 552 { 553 if (unlikely (glyph >= glyph_end)) return Glyph (); 554 repeat = *glyph + 1; 555 glyph++; 556 } 557 558 unsigned int xBytes, yBytes; 559 xBytes = yBytes = 0; 560 if (flag & FLAG_X_SHORT) xBytes = 1; 561 else if ((flag & FLAG_X_SAME) == 0) xBytes = 2; 562 563 if (flag & FLAG_Y_SHORT) yBytes = 1; 564 else if ((flag & FLAG_Y_SAME) == 0) yBytes = 2; 565 566 coord_bytes += (xBytes + yBytes) * repeat; 567 coords_with_flags += repeat; 568 if (coords_with_flags >= num_coordinates) break; 569 } 570 571 if (unlikely (coords_with_flags != num_coordinates)) return Glyph (); 572 return Glyph (bytes.sub_array (0, bytes.length + coord_bytes - (glyph_end - glyph))); 573 } 574 575 /* zero instruction length */ drop_hintsOT::glyf::Glyph::SimpleGlyph576 void drop_hints () 577 { 578 GlyphHeader &glyph_header = const_cast<GlyphHeader &> (header); 579 (HBUINT16 &) StructAtOffset<HBUINT16> (&glyph_header, instruction_len_offset ()) = 0; 580 } 581 drop_hints_bytesOT::glyf::Glyph::SimpleGlyph582 void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const 583 { 584 unsigned int instructions_len = instructions_length (); 585 unsigned int glyph_length = length (instructions_len); 586 dest_start = bytes.sub_array (0, glyph_length - instructions_len); 587 dest_end = bytes.sub_array (glyph_length, bytes.length - glyph_length); 588 } 589 set_overlaps_flagOT::glyf::Glyph::SimpleGlyph590 void set_overlaps_flag () 591 { 592 if (unlikely (!header.numberOfContours)) return; 593 594 unsigned flags_offset = length (instructions_length ()); 595 if (unlikely (flags_offset + 1 > bytes.length)) return; 596 597 HBUINT8 &first_flag = (HBUINT8 &) StructAtOffset<HBUINT16> (&bytes, flags_offset); 598 first_flag = (uint8_t) first_flag | FLAG_OVERLAP_SIMPLE; 599 } 600 read_pointsOT::glyf::Glyph::SimpleGlyph601 static bool read_points (const HBUINT8 *&p /* IN/OUT */, 602 contour_point_vector_t &points_ /* IN/OUT */, 603 const hb_bytes_t &bytes, 604 void (* setter) (contour_point_t &_, float v), 605 const simple_glyph_flag_t short_flag, 606 const simple_glyph_flag_t same_flag) 607 { 608 float v = 0; 609 for (unsigned i = 0; i < points_.length; i++) 610 { 611 uint8_t flag = points_[i].flag; 612 if (flag & short_flag) 613 { 614 if (unlikely (!bytes.check_range (p))) return false; 615 if (flag & same_flag) 616 v += *p++; 617 else 618 v -= *p++; 619 } 620 else 621 { 622 if (!(flag & same_flag)) 623 { 624 if (unlikely (!bytes.check_range ((const HBUINT16 *) p))) return false; 625 v += *(const HBINT16 *) p; 626 p += HBINT16::static_size; 627 } 628 } 629 setter (points_[i], v); 630 } 631 return true; 632 } 633 get_contour_pointsOT::glyf::Glyph::SimpleGlyph634 bool get_contour_points (contour_point_vector_t &points_ /* OUT */, 635 bool phantom_only = false) const 636 { 637 const HBUINT16 *endPtsOfContours = &StructAfter<HBUINT16> (header); 638 int num_contours = header.numberOfContours; 639 if (unlikely (!bytes.check_range (&endPtsOfContours[num_contours + 1]))) return false; 640 unsigned int num_points = endPtsOfContours[num_contours - 1] + 1; 641 642 points_.resize (num_points); 643 for (unsigned int i = 0; i < points_.length; i++) points_[i].init (); 644 if (phantom_only) return true; 645 646 for (int i = 0; i < num_contours; i++) 647 points_[endPtsOfContours[i]].is_end_point = true; 648 649 /* Skip instructions */ 650 const HBUINT8 *p = &StructAtOffset<HBUINT8> (&endPtsOfContours[num_contours + 1], 651 endPtsOfContours[num_contours]); 652 653 /* Read flags */ 654 for (unsigned int i = 0; i < num_points; i++) 655 { 656 if (unlikely (!bytes.check_range (p))) return false; 657 uint8_t flag = *p++; 658 points_[i].flag = flag; 659 if (flag & FLAG_REPEAT) 660 { 661 if (unlikely (!bytes.check_range (p))) return false; 662 unsigned int repeat_count = *p++; 663 while ((repeat_count-- > 0) && (++i < num_points)) 664 points_[i].flag = flag; 665 } 666 } 667 668 /* Read x & y coordinates */ 669 return read_points (p, points_, bytes, [] (contour_point_t &p, float v) { p.x = v; }, 670 FLAG_X_SHORT, FLAG_X_SAME) 671 && read_points (p, points_, bytes, [] (contour_point_t &p, float v) { p.y = v; }, 672 FLAG_Y_SHORT, FLAG_Y_SAME); 673 } 674 }; 675 676 struct CompositeGlyph 677 { 678 const GlyphHeader &header; 679 hb_bytes_t bytes; CompositeGlyphOT::glyf::Glyph::CompositeGlyph680 CompositeGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) : 681 header (header_), bytes (bytes_) {} 682 get_iteratorOT::glyf::Glyph::CompositeGlyph683 composite_iter_t get_iterator () const 684 { return composite_iter_t (bytes, &StructAfter<CompositeGlyphChain, GlyphHeader> (header)); } 685 instructions_lengthOT::glyf::Glyph::CompositeGlyph686 unsigned int instructions_length (hb_bytes_t bytes) const 687 { 688 unsigned int start = bytes.length; 689 unsigned int end = bytes.length; 690 const CompositeGlyphChain *last = nullptr; 691 for (auto &item : get_iterator ()) 692 last = &item; 693 if (unlikely (!last)) return 0; 694 695 if (last->has_instructions ()) 696 start = (char *) last - &bytes + last->get_size (); 697 if (unlikely (start > end)) return 0; 698 return end - start; 699 } 700 701 /* Trimming for composites not implemented. 702 * If removing hints it falls out of that. */ trim_paddingOT::glyf::Glyph::CompositeGlyph703 const Glyph trim_padding () const { return Glyph (bytes); } 704 drop_hintsOT::glyf::Glyph::CompositeGlyph705 void drop_hints () 706 { 707 for (const auto &_ : get_iterator ()) 708 const_cast<CompositeGlyphChain &> (_).drop_instructions_flag (); 709 } 710 711 /* Chop instructions off the end */ drop_hints_bytesOT::glyf::Glyph::CompositeGlyph712 void drop_hints_bytes (hb_bytes_t &dest_start) const 713 { dest_start = bytes.sub_array (0, bytes.length - instructions_length (bytes)); } 714 set_overlaps_flagOT::glyf::Glyph::CompositeGlyph715 void set_overlaps_flag () 716 { 717 const_cast<CompositeGlyphChain &> (StructAfter<CompositeGlyphChain, GlyphHeader> (header)) 718 .set_overlaps_flag (); 719 } 720 }; 721 722 enum glyph_type_t { EMPTY, SIMPLE, COMPOSITE }; 723 724 public: get_composite_iteratorOT::glyf::Glyph725 composite_iter_t get_composite_iterator () const 726 { 727 if (type != COMPOSITE) return composite_iter_t (); 728 return CompositeGlyph (*header, bytes).get_iterator (); 729 } 730 trim_paddingOT::glyf::Glyph731 const Glyph trim_padding () const 732 { 733 switch (type) { 734 case COMPOSITE: return CompositeGlyph (*header, bytes).trim_padding (); 735 case SIMPLE: return SimpleGlyph (*header, bytes).trim_padding (); 736 default: return bytes; 737 } 738 } 739 drop_hintsOT::glyf::Glyph740 void drop_hints () 741 { 742 switch (type) { 743 case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints (); return; 744 case SIMPLE: SimpleGlyph (*header, bytes).drop_hints (); return; 745 default: return; 746 } 747 } 748 set_overlaps_flagOT::glyf::Glyph749 void set_overlaps_flag () 750 { 751 switch (type) { 752 case COMPOSITE: CompositeGlyph (*header, bytes).set_overlaps_flag (); return; 753 case SIMPLE: SimpleGlyph (*header, bytes).set_overlaps_flag (); return; 754 default: return; 755 } 756 } 757 drop_hints_bytesOT::glyf::Glyph758 void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const 759 { 760 switch (type) { 761 case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints_bytes (dest_start); return; 762 case SIMPLE: SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end); return; 763 default: return; 764 } 765 } 766 767 /* Note: Recursively calls itself. 768 * all_points includes phantom points 769 */ get_pointsOT::glyf::Glyph770 bool get_points (hb_font_t *font, const accelerator_t &glyf_accelerator, 771 contour_point_vector_t &all_points /* OUT */, 772 bool phantom_only = false, 773 unsigned int depth = 0) const 774 { 775 if (unlikely (depth > HB_MAX_NESTING_LEVEL)) return false; 776 contour_point_vector_t points; 777 778 switch (type) { 779 case COMPOSITE: 780 { 781 /* pseudo component points for each component in composite glyph */ 782 unsigned num_points = hb_len (CompositeGlyph (*header, bytes).get_iterator ()); 783 if (unlikely (!points.resize (num_points))) return false; 784 for (unsigned i = 0; i < points.length; i++) 785 points[i].init (); 786 break; 787 } 788 case SIMPLE: 789 if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (points, phantom_only))) 790 return false; 791 break; 792 } 793 794 /* Init phantom points */ 795 if (unlikely (!points.resize (points.length + PHANTOM_COUNT))) return false; 796 hb_array_t<contour_point_t> phantoms = points.sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT); 797 { 798 for (unsigned i = 0; i < PHANTOM_COUNT; ++i) phantoms[i].init (); 799 int h_delta = (int) header->xMin - 800 glyf_accelerator.hmtx->get_side_bearing (gid); 801 int v_orig = (int) header->yMax + 802 #ifndef HB_NO_VERTICAL 803 glyf_accelerator.vmtx->get_side_bearing (gid) 804 #else 805 0 806 #endif 807 ; 808 unsigned h_adv = glyf_accelerator.hmtx->get_advance (gid); 809 unsigned v_adv = 810 #ifndef HB_NO_VERTICAL 811 glyf_accelerator.vmtx->get_advance (gid) 812 #else 813 - font->face->get_upem () 814 #endif 815 ; 816 phantoms[PHANTOM_LEFT].x = h_delta; 817 phantoms[PHANTOM_RIGHT].x = h_adv + h_delta; 818 phantoms[PHANTOM_TOP].y = v_orig; 819 phantoms[PHANTOM_BOTTOM].y = v_orig - (int) v_adv; 820 } 821 822 #ifndef HB_NO_VAR 823 if (unlikely (!glyf_accelerator.gvar->apply_deltas_to_points (gid, font, points.as_array ()))) 824 return false; 825 #endif 826 827 switch (type) { 828 case SIMPLE: 829 all_points.extend (points.as_array ()); 830 break; 831 case COMPOSITE: 832 { 833 unsigned int comp_index = 0; 834 for (auto &item : get_composite_iterator ()) 835 { 836 contour_point_vector_t comp_points; 837 if (unlikely (!glyf_accelerator.glyph_for_gid (item.get_glyph_index ()) 838 .get_points (font, glyf_accelerator, comp_points, 839 phantom_only, depth + 1) 840 || comp_points.length < PHANTOM_COUNT)) 841 return false; 842 843 /* Copy phantom points from component if USE_MY_METRICS flag set */ 844 if (item.is_use_my_metrics ()) 845 for (unsigned int i = 0; i < PHANTOM_COUNT; i++) 846 phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i]; 847 848 /* Apply component transformation & translation */ 849 item.transform_points (comp_points); 850 851 /* Apply translation from gvar */ 852 comp_points.translate (points[comp_index]); 853 854 if (item.is_anchored ()) 855 { 856 unsigned int p1, p2; 857 item.get_anchor_points (p1, p2); 858 if (likely (p1 < all_points.length && p2 < comp_points.length)) 859 { 860 contour_point_t delta; 861 delta.init (all_points[p1].x - comp_points[p2].x, 862 all_points[p1].y - comp_points[p2].y); 863 864 comp_points.translate (delta); 865 } 866 } 867 868 all_points.extend (comp_points.sub_array (0, comp_points.length - PHANTOM_COUNT)); 869 870 comp_index++; 871 } 872 873 all_points.extend (phantoms); 874 } break; 875 default: 876 all_points.extend (phantoms); 877 } 878 879 if (depth == 0) /* Apply at top level */ 880 { 881 /* Undocumented rasterizer behavior: 882 * Shift points horizontally by the updated left side bearing 883 */ 884 contour_point_t delta; 885 delta.init (-phantoms[PHANTOM_LEFT].x, 0.f); 886 if (delta.x) all_points.translate (delta); 887 } 888 889 return true; 890 } 891 get_extentsOT::glyf::Glyph892 bool get_extents (hb_font_t *font, const accelerator_t &glyf_accelerator, 893 hb_glyph_extents_t *extents) const 894 { 895 if (type == EMPTY) return true; /* Empty glyph; zero extents. */ 896 return header->get_extents (font, glyf_accelerator, gid, extents); 897 } 898 get_bytesOT::glyf::Glyph899 hb_bytes_t get_bytes () const { return bytes; } 900 GlyphOT::glyf::Glyph901 Glyph (hb_bytes_t bytes_ = hb_bytes_t (), 902 hb_codepoint_t gid_ = (hb_codepoint_t) -1) : bytes (bytes_), gid (gid_), 903 header (bytes.as<GlyphHeader> ()) 904 { 905 int num_contours = header->numberOfContours; 906 if (unlikely (num_contours == 0)) type = EMPTY; 907 else if (num_contours > 0) type = SIMPLE; 908 else type = COMPOSITE; /* negative numbers */ 909 } 910 911 protected: 912 hb_bytes_t bytes; 913 hb_codepoint_t gid; 914 const GlyphHeader *header; 915 unsigned type; 916 }; 917 918 struct accelerator_t 919 { accelerator_tOT::glyf::accelerator_t920 accelerator_t (hb_face_t *face) 921 { 922 short_offset = false; 923 num_glyphs = 0; 924 loca_table = nullptr; 925 glyf_table = nullptr; 926 #ifndef HB_NO_VAR 927 gvar = nullptr; 928 #endif 929 hmtx = nullptr; 930 #ifndef HB_NO_VERTICAL 931 vmtx = nullptr; 932 #endif 933 const OT::head &head = *face->table.head; 934 if (head.indexToLocFormat > 1 || head.glyphDataFormat > 0) 935 /* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */ 936 return; 937 short_offset = 0 == head.indexToLocFormat; 938 939 loca_table = hb_sanitize_context_t ().reference_table<loca> (face); 940 glyf_table = hb_sanitize_context_t ().reference_table<glyf> (face); 941 #ifndef HB_NO_VAR 942 gvar = face->table.gvar; 943 #endif 944 hmtx = face->table.hmtx; 945 #ifndef HB_NO_VERTICAL 946 vmtx = face->table.vmtx; 947 #endif 948 949 num_glyphs = hb_max (1u, loca_table.get_length () / (short_offset ? 2 : 4)) - 1; 950 num_glyphs = hb_min (num_glyphs, face->get_num_glyphs ()); 951 } ~accelerator_tOT::glyf::accelerator_t952 ~accelerator_t () 953 { 954 loca_table.destroy (); 955 glyf_table.destroy (); 956 } 957 958 protected: 959 template<typename T> get_pointsOT::glyf::accelerator_t960 bool get_points (hb_font_t *font, hb_codepoint_t gid, T consumer) const 961 { 962 if (gid >= num_glyphs) return false; 963 964 /* Making this allocfree is not that easy 965 https://github.com/harfbuzz/harfbuzz/issues/2095 966 mostly because of gvar handling in VF fonts, 967 perhaps a separate path for non-VF fonts can be considered */ 968 contour_point_vector_t all_points; 969 970 bool phantom_only = !consumer.is_consuming_contour_points (); 971 if (unlikely (!glyph_for_gid (gid).get_points (font, *this, all_points, phantom_only))) 972 return false; 973 974 if (consumer.is_consuming_contour_points ()) 975 { 976 for (unsigned point_index = 0; point_index + 4 < all_points.length; ++point_index) 977 consumer.consume_point (all_points[point_index]); 978 consumer.points_end (); 979 } 980 981 /* Where to write phantoms, nullptr if not requested */ 982 contour_point_t *phantoms = consumer.get_phantoms_sink (); 983 if (phantoms) 984 for (unsigned i = 0; i < PHANTOM_COUNT; ++i) 985 phantoms[i] = all_points[all_points.length - PHANTOM_COUNT + i]; 986 987 return true; 988 } 989 990 #ifndef HB_NO_VAR 991 struct points_aggregator_t 992 { 993 hb_font_t *font; 994 hb_glyph_extents_t *extents; 995 contour_point_t *phantoms; 996 997 struct contour_bounds_t 998 { contour_bounds_tOT::glyf::accelerator_t::points_aggregator_t::contour_bounds_t999 contour_bounds_t () { min_x = min_y = FLT_MAX; max_x = max_y = -FLT_MAX; } 1000 addOT::glyf::accelerator_t::points_aggregator_t::contour_bounds_t1001 void add (const contour_point_t &p) 1002 { 1003 min_x = hb_min (min_x, p.x); 1004 min_y = hb_min (min_y, p.y); 1005 max_x = hb_max (max_x, p.x); 1006 max_y = hb_max (max_y, p.y); 1007 } 1008 emptyOT::glyf::accelerator_t::points_aggregator_t::contour_bounds_t1009 bool empty () const { return (min_x >= max_x) || (min_y >= max_y); } 1010 get_extentsOT::glyf::accelerator_t::points_aggregator_t::contour_bounds_t1011 void get_extents (hb_font_t *font, hb_glyph_extents_t *extents) 1012 { 1013 if (unlikely (empty ())) 1014 { 1015 extents->width = 0; 1016 extents->x_bearing = 0; 1017 extents->height = 0; 1018 extents->y_bearing = 0; 1019 return; 1020 } 1021 extents->x_bearing = font->em_scalef_x (min_x); 1022 extents->width = font->em_scalef_x (max_x) - extents->x_bearing; 1023 extents->y_bearing = font->em_scalef_y (max_y); 1024 extents->height = font->em_scalef_y (min_y) - extents->y_bearing; 1025 } 1026 1027 protected: 1028 float min_x, min_y, max_x, max_y; 1029 } bounds; 1030 points_aggregator_tOT::glyf::accelerator_t::points_aggregator_t1031 points_aggregator_t (hb_font_t *font_, hb_glyph_extents_t *extents_, contour_point_t *phantoms_) 1032 { 1033 font = font_; 1034 extents = extents_; 1035 phantoms = phantoms_; 1036 if (extents) bounds = contour_bounds_t (); 1037 } 1038 consume_pointOT::glyf::accelerator_t::points_aggregator_t1039 void consume_point (const contour_point_t &point) { bounds.add (point); } points_endOT::glyf::accelerator_t::points_aggregator_t1040 void points_end () { bounds.get_extents (font, extents); } 1041 is_consuming_contour_pointsOT::glyf::accelerator_t::points_aggregator_t1042 bool is_consuming_contour_points () { return extents; } get_phantoms_sinkOT::glyf::accelerator_t::points_aggregator_t1043 contour_point_t *get_phantoms_sink () { return phantoms; } 1044 }; 1045 1046 public: 1047 unsigned get_advance_varOT::glyf::accelerator_t1048 get_advance_var (hb_font_t *font, hb_codepoint_t gid, bool is_vertical) const 1049 { 1050 if (unlikely (gid >= num_glyphs)) return 0; 1051 1052 bool success = false; 1053 1054 contour_point_t phantoms[PHANTOM_COUNT]; 1055 if (likely (font->num_coords == gvar->get_axis_count ())) 1056 success = get_points (font, gid, points_aggregator_t (font, nullptr, phantoms)); 1057 1058 if (unlikely (!success)) 1059 return 1060 #ifndef HB_NO_VERTICAL 1061 is_vertical ? vmtx->get_advance (gid) : 1062 #endif 1063 hmtx->get_advance (gid); 1064 1065 float result = is_vertical 1066 ? phantoms[PHANTOM_TOP].y - phantoms[PHANTOM_BOTTOM].y 1067 : phantoms[PHANTOM_RIGHT].x - phantoms[PHANTOM_LEFT].x; 1068 return hb_clamp (roundf (result), 0.f, (float) UINT_MAX / 2); 1069 } 1070 get_side_bearing_varOT::glyf::accelerator_t1071 int get_side_bearing_var (hb_font_t *font, hb_codepoint_t gid, bool is_vertical) const 1072 { 1073 if (unlikely (gid >= num_glyphs)) return 0; 1074 1075 hb_glyph_extents_t extents; 1076 1077 contour_point_t phantoms[PHANTOM_COUNT]; 1078 if (unlikely (!get_points (font, gid, points_aggregator_t (font, &extents, phantoms)))) 1079 return 1080 #ifndef HB_NO_VERTICAL 1081 is_vertical ? vmtx->get_side_bearing (gid) : 1082 #endif 1083 hmtx->get_side_bearing (gid); 1084 1085 return is_vertical 1086 ? ceilf (phantoms[PHANTOM_TOP].y) - extents.y_bearing 1087 : floorf (phantoms[PHANTOM_LEFT].x); 1088 } 1089 #endif 1090 1091 public: get_extentsOT::glyf::accelerator_t1092 bool get_extents (hb_font_t *font, hb_codepoint_t gid, hb_glyph_extents_t *extents) const 1093 { 1094 if (unlikely (gid >= num_glyphs)) return false; 1095 1096 #ifndef HB_NO_VAR 1097 if (font->num_coords && font->num_coords == gvar->get_axis_count ()) 1098 return get_points (font, gid, points_aggregator_t (font, extents, nullptr)); 1099 #endif 1100 return glyph_for_gid (gid).get_extents (font, *this, extents); 1101 } 1102 1103 const Glyph glyph_for_gidOT::glyf::accelerator_t1104 glyph_for_gid (hb_codepoint_t gid, bool needs_padding_removal = false) const 1105 { 1106 if (unlikely (gid >= num_glyphs)) return Glyph (); 1107 1108 unsigned int start_offset, end_offset; 1109 1110 if (short_offset) 1111 { 1112 const HBUINT16 *offsets = (const HBUINT16 *) loca_table->dataZ.arrayZ; 1113 start_offset = 2 * offsets[gid]; 1114 end_offset = 2 * offsets[gid + 1]; 1115 } 1116 else 1117 { 1118 const HBUINT32 *offsets = (const HBUINT32 *) loca_table->dataZ.arrayZ; 1119 start_offset = offsets[gid]; 1120 end_offset = offsets[gid + 1]; 1121 } 1122 1123 if (unlikely (start_offset > end_offset || end_offset > glyf_table.get_length ())) 1124 return Glyph (); 1125 1126 Glyph glyph (hb_bytes_t ((const char *) this->glyf_table + start_offset, 1127 end_offset - start_offset), gid); 1128 return needs_padding_removal ? glyph.trim_padding () : glyph; 1129 } 1130 1131 unsigned add_gid_and_childrenOT::glyf::accelerator_t1132 add_gid_and_children (hb_codepoint_t gid, 1133 hb_set_t *gids_to_retain, 1134 unsigned depth = 0, 1135 unsigned operation_count = 0) const 1136 { 1137 if (unlikely (depth++ > HB_MAX_NESTING_LEVEL)) return operation_count; 1138 if (unlikely (operation_count++ > HB_MAX_COMPOSITE_OPERATIONS)) return operation_count; 1139 /* Check if is already visited */ 1140 if (gids_to_retain->has (gid)) return operation_count; 1141 1142 gids_to_retain->add (gid); 1143 1144 auto it = glyph_for_gid (gid).get_composite_iterator (); 1145 while (it) 1146 { 1147 auto item = *(it++); 1148 operation_count = 1149 add_gid_and_children (item.get_glyph_index (), gids_to_retain, depth, operation_count); 1150 } 1151 1152 return operation_count; 1153 } 1154 1155 #ifdef HB_EXPERIMENTAL_API 1156 struct path_builder_t 1157 { 1158 hb_font_t *font; 1159 draw_helper_t *draw_helper; 1160 1161 struct optional_point_t 1162 { optional_point_tOT::glyf::accelerator_t::path_builder_t::optional_point_t1163 optional_point_t () { has_data = false; } optional_point_tOT::glyf::accelerator_t::path_builder_t::optional_point_t1164 optional_point_t (float x_, float y_) { x = x_; y = y_; has_data = true; } 1165 1166 bool has_data; 1167 float x; 1168 float y; 1169 lerpOT::glyf::accelerator_t::path_builder_t::optional_point_t1170 optional_point_t lerp (optional_point_t p, float t) 1171 { return optional_point_t (x + t * (p.x - x), y + t * (p.y - y)); } 1172 } first_oncurve, first_offcurve, last_offcurve; 1173 path_builder_tOT::glyf::accelerator_t::path_builder_t1174 path_builder_t (hb_font_t *font_, draw_helper_t &draw_helper_) 1175 { 1176 font = font_; 1177 draw_helper = &draw_helper_; 1178 first_oncurve = first_offcurve = last_offcurve = optional_point_t (); 1179 } 1180 1181 /* based on https://github.com/RazrFalcon/ttf-parser/blob/4f32821/src/glyf.rs#L287 1182 See also: 1183 * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM01/Chap1.html 1184 * https://stackoverflow.com/a/20772557 */ consume_pointOT::glyf::accelerator_t::path_builder_t1185 void consume_point (const contour_point_t &point) 1186 { 1187 /* Skip empty contours */ 1188 if (unlikely (point.is_end_point && !first_oncurve.has_data && !first_offcurve.has_data)) 1189 return; 1190 1191 bool is_on_curve = point.flag & Glyph::FLAG_ON_CURVE; 1192 optional_point_t p (point.x, point.y); 1193 if (!first_oncurve.has_data) 1194 { 1195 if (is_on_curve) 1196 { 1197 first_oncurve = p; 1198 draw_helper->move_to (font->em_scalef_x (p.x), font->em_scalef_y (p.y)); 1199 } 1200 else 1201 { 1202 if (first_offcurve.has_data) 1203 { 1204 optional_point_t mid = first_offcurve.lerp (p, .5f); 1205 first_oncurve = mid; 1206 last_offcurve = p; 1207 draw_helper->move_to (font->em_scalef_x (mid.x), font->em_scalef_y (mid.y)); 1208 } 1209 else 1210 first_offcurve = p; 1211 } 1212 } 1213 else 1214 { 1215 if (last_offcurve.has_data) 1216 { 1217 if (is_on_curve) 1218 { 1219 draw_helper->quadratic_to (font->em_scalef_x (last_offcurve.x), font->em_scalef_y (last_offcurve.y), 1220 font->em_scalef_x (p.x), font->em_scalef_y (p.y)); 1221 last_offcurve = optional_point_t (); 1222 } 1223 else 1224 { 1225 optional_point_t mid = last_offcurve.lerp (p, .5f); 1226 draw_helper->quadratic_to (font->em_scalef_x (last_offcurve.x), font->em_scalef_y (last_offcurve.y), 1227 font->em_scalef_x (mid.x), font->em_scalef_y (mid.y)); 1228 last_offcurve = p; 1229 } 1230 } 1231 else 1232 { 1233 if (is_on_curve) 1234 draw_helper->line_to (font->em_scalef_x (p.x), font->em_scalef_y (p.y)); 1235 else 1236 last_offcurve = p; 1237 } 1238 } 1239 1240 if (point.is_end_point) 1241 { 1242 if (first_offcurve.has_data && last_offcurve.has_data) 1243 { 1244 optional_point_t mid = last_offcurve.lerp (first_offcurve, .5f); 1245 draw_helper->quadratic_to (font->em_scalef_x (last_offcurve.x), font->em_scalef_y (last_offcurve.y), 1246 font->em_scalef_x (mid.x), font->em_scalef_y (mid.y)); 1247 last_offcurve = optional_point_t (); 1248 /* now check the rest */ 1249 } 1250 1251 if (first_offcurve.has_data && first_oncurve.has_data) 1252 draw_helper->quadratic_to (font->em_scalef_x (first_offcurve.x), font->em_scalef_y (first_offcurve.y), 1253 font->em_scalef_x (first_oncurve.x), font->em_scalef_y (first_oncurve.y)); 1254 else if (last_offcurve.has_data && first_oncurve.has_data) 1255 draw_helper->quadratic_to (font->em_scalef_x (last_offcurve.x), font->em_scalef_y (last_offcurve.y), 1256 font->em_scalef_x (first_oncurve.x), font->em_scalef_y (first_oncurve.y)); 1257 else if (first_oncurve.has_data) 1258 draw_helper->line_to (font->em_scalef_x (first_oncurve.x), font->em_scalef_y (first_oncurve.y)); 1259 1260 /* Getting ready for the next contour */ 1261 first_oncurve = first_offcurve = last_offcurve = optional_point_t (); 1262 draw_helper->end_path (); 1263 } 1264 } points_endOT::glyf::accelerator_t::path_builder_t1265 void points_end () {} 1266 is_consuming_contour_pointsOT::glyf::accelerator_t::path_builder_t1267 bool is_consuming_contour_points () { return true; } get_phantoms_sinkOT::glyf::accelerator_t::path_builder_t1268 contour_point_t *get_phantoms_sink () { return nullptr; } 1269 }; 1270 1271 bool get_pathOT::glyf::accelerator_t1272 get_path (hb_font_t *font, hb_codepoint_t gid, draw_helper_t &draw_helper) const 1273 { return get_points (font, gid, path_builder_t (font, draw_helper)); } 1274 #endif 1275 1276 #ifndef HB_NO_VAR 1277 const gvar_accelerator_t *gvar; 1278 #endif 1279 const hmtx_accelerator_t *hmtx; 1280 #ifndef HB_NO_VERTICAL 1281 const vmtx_accelerator_t *vmtx; 1282 #endif 1283 1284 private: 1285 bool short_offset; 1286 unsigned int num_glyphs; 1287 hb_blob_ptr_t<loca> loca_table; 1288 hb_blob_ptr_t<glyf> glyf_table; 1289 }; 1290 1291 struct SubsetGlyph 1292 { 1293 hb_codepoint_t new_gid; 1294 hb_codepoint_t old_gid; 1295 Glyph source_glyph; 1296 hb_bytes_t dest_start; /* region of source_glyph to copy first */ 1297 hb_bytes_t dest_end; /* region of source_glyph to copy second */ 1298 serializeOT::glyf::SubsetGlyph1299 bool serialize (hb_serialize_context_t *c, 1300 bool use_short_loca, 1301 const hb_subset_plan_t *plan) const 1302 { 1303 TRACE_SERIALIZE (this); 1304 1305 hb_bytes_t dest_glyph = dest_start.copy (c); 1306 dest_glyph = hb_bytes_t (&dest_glyph, dest_glyph.length + dest_end.copy (c).length); 1307 unsigned int pad_length = use_short_loca ? padding () : 0; 1308 DEBUG_MSG (SUBSET, nullptr, "serialize %d byte glyph, width %d pad %d", dest_glyph.length, dest_glyph.length + pad_length, pad_length); 1309 1310 HBUINT8 pad; 1311 pad = 0; 1312 while (pad_length > 0) 1313 { 1314 c->embed (pad); 1315 pad_length--; 1316 } 1317 1318 if (unlikely (!dest_glyph.length)) return_trace (true); 1319 1320 /* update components gids */ 1321 for (auto &_ : Glyph (dest_glyph).get_composite_iterator ()) 1322 { 1323 hb_codepoint_t new_gid; 1324 if (plan->new_gid_for_old_gid (_.get_glyph_index (), &new_gid)) 1325 const_cast<CompositeGlyphChain &> (_).set_glyph_index (new_gid); 1326 } 1327 1328 if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING) 1329 Glyph (dest_glyph).drop_hints (); 1330 1331 if (plan->flags & HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG) 1332 Glyph (dest_glyph).set_overlaps_flag (); 1333 1334 return_trace (true); 1335 } 1336 drop_hints_bytesOT::glyf::SubsetGlyph1337 void drop_hints_bytes () 1338 { source_glyph.drop_hints_bytes (dest_start, dest_end); } 1339 lengthOT::glyf::SubsetGlyph1340 unsigned int length () const { return dest_start.length + dest_end.length; } 1341 /* pad to 2 to ensure 2-byte loca will be ok */ paddingOT::glyf::SubsetGlyph1342 unsigned int padding () const { return length () % 2; } padded_sizeOT::glyf::SubsetGlyph1343 unsigned int padded_size () const { return length () + padding (); } 1344 }; 1345 1346 protected: 1347 UnsizedArrayOf<HBUINT8> 1348 dataZ; /* Glyphs data. */ 1349 public: 1350 DEFINE_SIZE_MIN (0); /* In reality, this is UNBOUNDED() type; but since we always 1351 * check the size externally, allow Null() object of it by 1352 * defining it _MIN instead. */ 1353 }; 1354 1355 struct glyf_accelerator_t : glyf::accelerator_t { glyf_accelerator_tOT::glyf_accelerator_t1356 glyf_accelerator_t (hb_face_t *face) : glyf::accelerator_t (face) {} 1357 }; 1358 1359 1360 } /* namespace OT */ 1361 1362 1363 #endif /* HB_OT_GLYF_TABLE_HH */ 1364