ttgload.c revision ac812959bbe118d512d955d6d9b6a2f54c4b5522
1/***************************************************************************/ 2/* */ 3/* ttgload.c */ 4/* */ 5/* TrueType Glyph Loader (body). */ 6/* */ 7/* Copyright 1996-2001 by */ 8/* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9/* */ 10/* This file is part of the FreeType project, and may only be used, */ 11/* modified, and distributed under the terms of the FreeType project */ 12/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13/* this file you indicate that you have read the license and */ 14/* understand and accept it fully. */ 15/* */ 16/***************************************************************************/ 17 18 19#include <ft2build.h> 20#include FT_INTERNAL_DEBUG_H 21#include FT_INTERNAL_CALC_H 22#include FT_INTERNAL_STREAM_H 23#include FT_INTERNAL_SFNT_H 24#include FT_TRUETYPE_TAGS_H 25#include FT_OUTLINE_H 26 27#include "ttgload.h" 28 29#include "tterrors.h" 30 31 32 /*************************************************************************/ 33 /* */ 34 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 35 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 36 /* messages during execution. */ 37 /* */ 38#undef FT_COMPONENT 39#define FT_COMPONENT trace_ttgload 40 41 42 /*************************************************************************/ 43 /* */ 44 /* Composite font flags. */ 45 /* */ 46#define ARGS_ARE_WORDS 0x001 47#define ARGS_ARE_XY_VALUES 0x002 48#define ROUND_XY_TO_GRID 0x004 49#define WE_HAVE_A_SCALE 0x008 50/* reserved 0x010 */ 51#define MORE_COMPONENTS 0x020 52#define WE_HAVE_AN_XY_SCALE 0x040 53#define WE_HAVE_A_2X2 0x080 54#define WE_HAVE_INSTR 0x100 55#define USE_MY_METRICS 0x200 56 57 58 59 /*************************************************************************/ 60 /* */ 61 /* <Function> */ 62 /* TT_Get_Metrics */ 63 /* */ 64 /* <Description> */ 65 /* Returns the horizontal or vertical metrics in font units for a */ 66 /* given glyph. The metrics are the left side bearing (resp. top */ 67 /* side bearing) and advance width (resp. advance height). */ 68 /* */ 69 /* <Input> */ 70 /* header :: A pointer to either the horizontal or vertical metrics */ 71 /* structure. */ 72 /* */ 73 /* index :: The glyph index. */ 74 /* */ 75 /* <Output> */ 76 /* bearing :: The bearing, either left side or top side. */ 77 /* */ 78 /* advance :: The advance width resp. advance height. */ 79 /* */ 80 /* <Note> */ 81 /* This function will much probably move to another component in the */ 82 /* near future, but I haven't decided which yet. */ 83 /* */ 84 FT_LOCAL_DEF void 85 TT_Get_Metrics( TT_HoriHeader* header, 86 FT_UInt index, 87 FT_Short* bearing, 88 FT_UShort* advance ) 89 { 90 TT_LongMetrics* longs_m; 91 FT_UShort k = header->number_Of_HMetrics; 92 93 94 if ( index < (FT_UInt)k ) 95 { 96 longs_m = (TT_LongMetrics*)header->long_metrics + index; 97 *bearing = longs_m->bearing; 98 *advance = longs_m->advance; 99 } 100 else 101 { 102 *bearing = ((TT_ShortMetrics*)header->short_metrics)[index - k]; 103 *advance = ((TT_LongMetrics*)header->long_metrics)[k - 1].advance; 104 } 105 } 106 107 108 /*************************************************************************/ 109 /* */ 110 /* Returns the horizontal metrics in font units for a given glyph. If */ 111 /* `check' is true, take care of monospaced fonts by returning the */ 112 /* advance width maximum. */ 113 /* */ 114 static void 115 Get_HMetrics( TT_Face face, 116 FT_UInt index, 117 FT_Bool check, 118 FT_Short* lsb, 119 FT_UShort* aw ) 120 { 121 TT_Get_Metrics( &face->horizontal, index, lsb, aw ); 122 123 if ( check && face->postscript.isFixedPitch ) 124 *aw = face->horizontal.advance_Width_Max; 125 } 126 127 128 /*************************************************************************/ 129 /* */ 130 /* Returns the advance width table for a given pixel size if it is */ 131 /* found in the font's `hdmx' table (if any). */ 132 /* */ 133 static FT_Byte* 134 Get_Advance_Widths( TT_Face face, 135 FT_UShort ppem ) 136 { 137 FT_UShort n; 138 139 for ( n = 0; n < face->hdmx.num_records; n++ ) 140 if ( face->hdmx.records[n].ppem == ppem ) 141 return face->hdmx.records[n].widths; 142 143 return NULL; 144 } 145 146 147#define cur_to_org( n, zone ) \ 148 MEM_Copy( (zone)->org, (zone)->cur, (n) * sizeof ( FT_Vector ) ) 149 150#define org_to_cur( n, zone ) \ 151 MEM_Copy( (zone)->cur, (zone)->org, (n) * sizeof ( FT_Vector ) ) 152 153 154 /*************************************************************************/ 155 /* */ 156 /* Translates an array of coordinates. */ 157 /* */ 158 static void 159 translate_array( FT_UInt n, 160 FT_Vector* coords, 161 FT_Pos delta_x, 162 FT_Pos delta_y ) 163 { 164 FT_UInt k; 165 166 167 if ( delta_x ) 168 for ( k = 0; k < n; k++ ) 169 coords[k].x += delta_x; 170 171 if ( delta_y ) 172 for ( k = 0; k < n; k++ ) 173 coords[k].y += delta_y; 174 } 175 176 177 static void 178 tt_prepare_zone( TT_GlyphZone* zone, 179 FT_GlyphLoad* load, 180 FT_UInt start_point, 181 FT_UInt start_contour ) 182 { 183 zone->n_points = (FT_UShort)( load->outline.n_points - start_point ); 184 zone->n_contours = (FT_Short) ( load->outline.n_contours - start_contour ); 185 zone->org = load->extra_points + start_point; 186 zone->cur = load->outline.points + start_point; 187 zone->tags = (FT_Byte*)load->outline.tags + start_point; 188 zone->contours = (FT_UShort*)load->outline.contours + start_contour; 189 } 190 191 192#undef IS_HINTED 193#define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 ) 194 195 196 /*************************************************************************/ 197 /* */ 198 /* The following functions are used by default with TrueType fonts. */ 199 /* However, they can be replaced by alternatives if we need to support */ 200 /* TrueType-compressed formats (like MicroType) in the future. */ 201 /* */ 202 /*************************************************************************/ 203 204 FT_CALLBACK_DEF( FT_Error ) 205 TT_Access_Glyph_Frame( TT_Loader* loader, 206 FT_UInt glyph_index, 207 FT_ULong offset, 208 FT_UInt byte_count ) 209 { 210 FT_Error error; 211 FT_Stream stream = loader->stream; 212 213 /* for non-debug mode */ 214 FT_UNUSED( glyph_index ); 215 216 217 FT_TRACE5(( "Glyph %ld\n", glyph_index )); 218 219 /* the following line sets the `error' variable through macros! */ 220 if ( FILE_Seek( offset ) || ACCESS_Frame( byte_count ) ) 221 return error; 222 223 return TT_Err_Ok; 224 } 225 226 227 FT_CALLBACK_DEF( void ) 228 TT_Forget_Glyph_Frame( TT_Loader* loader ) 229 { 230 FT_Stream stream = loader->stream; 231 232 233 FORGET_Frame(); 234 } 235 236 237 FT_CALLBACK_DEF( FT_Error ) 238 TT_Load_Glyph_Header( TT_Loader* loader ) 239 { 240 FT_Stream stream = loader->stream; 241 FT_Int byte_len = loader->byte_len - 10; 242 243 244 if ( byte_len < 0 ) 245 return TT_Err_Invalid_Outline; 246 247 loader->n_contours = GET_Short(); 248 249 loader->bbox.xMin = GET_Short(); 250 loader->bbox.yMin = GET_Short(); 251 loader->bbox.xMax = GET_Short(); 252 loader->bbox.yMax = GET_Short(); 253 254 FT_TRACE5(( " # of contours: %d\n", loader->n_contours )); 255 FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin, 256 loader->bbox.xMax )); 257 FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin, 258 loader->bbox.yMax )); 259 loader->byte_len = byte_len; 260 261 return TT_Err_Ok; 262 } 263 264 265 FT_CALLBACK_DEF( FT_Error ) 266 TT_Load_Simple_Glyph( TT_Loader* load ) 267 { 268 FT_Error error; 269 FT_Stream stream = load->stream; 270 FT_GlyphLoader* gloader = load->gloader; 271 FT_Int n_contours = load->n_contours; 272 FT_Outline* outline; 273 TT_Face face = (TT_Face)load->face; 274 TT_GlyphSlot slot = (TT_GlyphSlot)load->glyph; 275 FT_UShort n_ins; 276 FT_Int n, n_points; 277 FT_Int byte_len = load->byte_len; 278 279 280 /* reading the contours endpoints & number of points */ 281 { 282 short* cur = gloader->current.outline.contours; 283 short* limit = cur + n_contours; 284 285 286 /* check space for contours array + instructions count */ 287 byte_len -= 2 * ( n_contours + 1 ); 288 if ( byte_len < 0 ) 289 goto Invalid_Outline; 290 291 for ( ; cur < limit; cur++ ) 292 cur[0] = GET_UShort(); 293 294 n_points = 0; 295 if ( n_contours > 0 ) 296 n_points = cur[-1] + 1; 297 298 error = FT_GlyphLoader_Check_Points( gloader, n_points + 2, 0 ); 299 if ( error ) 300 goto Fail; 301 302 /* we'd better check the contours table right now */ 303 outline = &gloader->current.outline; 304 305 for ( cur = outline->contours + 1; cur < limit; cur++ ) 306 if ( cur[-1] >= cur[0] ) 307 goto Invalid_Outline; 308 } 309 310 /* reading the bytecode instructions */ 311 slot->control_len = 0; 312 slot->control_data = 0; 313 314 n_ins = GET_UShort(); 315 316 FT_TRACE5(( " Instructions size: %d\n", n_ins )); 317 318 if ( n_ins > face->max_profile.maxSizeOfInstructions ) 319 { 320 FT_TRACE0(( "ERROR: Too many instructions!\n" )); 321 error = TT_Err_Too_Many_Hints; 322 goto Fail; 323 } 324 325 byte_len -= n_ins; 326 if ( byte_len < 0 ) 327 { 328 FT_TRACE0(( "ERROR: Instruction count mismatch!\n" )); 329 error = TT_Err_Too_Many_Hints; 330 goto Fail; 331 } 332 333#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 334 335 if ( ( load->load_flags & 336 ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) ) == 0 && 337 load->instructions ) 338 { 339 slot->control_len = n_ins; 340 slot->control_data = load->instructions; 341 342 MEM_Copy( load->instructions, stream->cursor, n_ins ); 343 } 344 345#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 346 347 stream->cursor += n_ins; 348 349 /* reading the point tags */ 350 { 351 FT_Byte* flag = (FT_Byte*)outline->tags; 352 FT_Byte* limit = flag + n_points; 353 FT_Byte c, count; 354 355 356 while ( flag < limit ) 357 { 358 if ( --byte_len < 0 ) 359 goto Invalid_Outline; 360 361 *flag++ = c = GET_Byte(); 362 if ( c & 8 ) 363 { 364 if ( --byte_len < 0 ) 365 goto Invalid_Outline; 366 367 count = GET_Byte(); 368 if ( flag + count > limit ) 369 goto Invalid_Outline; 370 371 for ( ; count > 0; count-- ) 372 *flag++ = c; 373 } 374 } 375 376 /* check that there is enough room to load the coordinates */ 377 for ( flag = (FT_Byte*)outline->tags; flag < limit; flag++ ) 378 { 379 if ( *flag & 2 ) 380 byte_len -= 1; 381 else if ( ( *flag & 16 ) == 0 ) 382 byte_len -= 2; 383 384 if ( *flag & 4 ) 385 byte_len -= 1; 386 else if ( ( *flag & 32 ) == 0 ) 387 byte_len -= 2; 388 } 389 390 if ( byte_len < 0 ) 391 goto Invalid_Outline; 392 } 393 394 /* reading the X coordinates */ 395 396 { 397 FT_Vector* vec = outline->points; 398 FT_Vector* limit = vec + n_points; 399 FT_Byte* flag = (FT_Byte*)outline->tags; 400 FT_Pos x = 0; 401 402 403 for ( ; vec < limit; vec++, flag++ ) 404 { 405 FT_Pos y = 0; 406 407 408 if ( *flag & 2 ) 409 { 410 y = GET_Byte(); 411 if ( ( *flag & 16 ) == 0 ) 412 y = -y; 413 } 414 else if ( ( *flag & 16 ) == 0 ) 415 y = GET_Short(); 416 417 x += y; 418 vec->x = x; 419 } 420 } 421 422 /* reading the Y coordinates */ 423 424 { 425 FT_Vector* vec = gloader->current.outline.points; 426 FT_Vector* limit = vec + n_points; 427 FT_Byte* flag = (FT_Byte*)outline->tags; 428 FT_Pos x = 0; 429 430 431 for ( ; vec < limit; vec++, flag++ ) 432 { 433 FT_Pos y = 0; 434 435 436 if ( *flag & 4 ) 437 { 438 y = GET_Byte(); 439 if ( ( *flag & 32 ) == 0 ) 440 y = -y; 441 } 442 else if ( ( *flag & 32 ) == 0 ) 443 y = GET_Short(); 444 445 x += y; 446 vec->y = x; 447 } 448 } 449 450 /* clear the touch tags */ 451 for ( n = 0; n < n_points; n++ ) 452 outline->tags[n] &= FT_Curve_Tag_On; 453 454 outline->n_points = (FT_UShort)n_points; 455 outline->n_contours = (FT_Short) n_contours; 456 457 load->byte_len = byte_len; 458 459 Fail: 460 return error; 461 462 Invalid_Outline: 463 error = TT_Err_Invalid_Outline; 464 goto Fail; 465 } 466 467 468 FT_CALLBACK_DEF( FT_Error ) 469 TT_Load_Composite_Glyph( TT_Loader* loader ) 470 { 471 FT_Error error; 472 FT_Stream stream = loader->stream; 473 FT_GlyphLoader* gloader = loader->gloader; 474 FT_SubGlyph* subglyph; 475 FT_UInt num_subglyphs; 476 FT_Int byte_len = loader->byte_len; 477 478 479 num_subglyphs = 0; 480 481 do 482 { 483 FT_Fixed xx, xy, yy, yx; 484 485 486 /* check that we can load a new subglyph */ 487 error = FT_GlyphLoader_Check_Subglyphs( gloader, num_subglyphs + 1 ); 488 if ( error ) 489 goto Fail; 490 491 /* check space */ 492 byte_len -= 4; 493 if ( byte_len < 0 ) 494 goto Invalid_Composite; 495 496 subglyph = gloader->current.subglyphs + num_subglyphs; 497 498 subglyph->arg1 = subglyph->arg2 = 0; 499 500 subglyph->flags = GET_UShort(); 501 subglyph->index = GET_UShort(); 502 503 /* check space */ 504 byte_len -= 2; 505 if ( subglyph->flags & ARGS_ARE_WORDS ) 506 byte_len -= 2; 507 if ( subglyph->flags & WE_HAVE_A_SCALE ) 508 byte_len -= 2; 509 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 510 byte_len -= 4; 511 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 512 byte_len -= 8; 513 514 if ( byte_len < 0 ) 515 goto Invalid_Composite; 516 517 /* read arguments */ 518 if ( subglyph->flags & ARGS_ARE_WORDS ) 519 { 520 subglyph->arg1 = GET_Short(); 521 subglyph->arg2 = GET_Short(); 522 } 523 else 524 { 525 subglyph->arg1 = GET_Char(); 526 subglyph->arg2 = GET_Char(); 527 } 528 529 /* read transform */ 530 xx = yy = 0x10000L; 531 xy = yx = 0; 532 533 if ( subglyph->flags & WE_HAVE_A_SCALE ) 534 { 535 xx = (FT_Fixed)GET_Short() << 2; 536 yy = xx; 537 } 538 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 539 { 540 xx = (FT_Fixed)GET_Short() << 2; 541 yy = (FT_Fixed)GET_Short() << 2; 542 } 543 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 544 { 545 xx = (FT_Fixed)GET_Short() << 2; 546 xy = (FT_Fixed)GET_Short() << 2; 547 yx = (FT_Fixed)GET_Short() << 2; 548 yy = (FT_Fixed)GET_Short() << 2; 549 } 550 551 subglyph->transform.xx = xx; 552 subglyph->transform.xy = xy; 553 subglyph->transform.yx = yx; 554 subglyph->transform.yy = yy; 555 556 num_subglyphs++; 557 558 } while ( subglyph->flags & MORE_COMPONENTS ); 559 560 gloader->current.num_subglyphs = num_subglyphs; 561 562#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 563 { 564 /* we must undo the ACCESS_Frame in order to point to the */ 565 /* composite instructions, if we find some. */ 566 /* we will process them later... */ 567 /* */ 568 loader->ins_pos = (FT_ULong)( FILE_Pos() + 569 stream->cursor - stream->limit ); 570 } 571#endif 572 573 loader->byte_len = byte_len; 574 575 Fail: 576 return error; 577 578 Invalid_Composite: 579 error = TT_Err_Invalid_Composite; 580 goto Fail; 581 } 582 583 584 FT_LOCAL_DEF void 585 TT_Init_Glyph_Loading( TT_Face face ) 586 { 587 face->access_glyph_frame = TT_Access_Glyph_Frame; 588 face->read_glyph_header = TT_Load_Glyph_Header; 589 face->read_simple_glyph = TT_Load_Simple_Glyph; 590 face->read_composite_glyph = TT_Load_Composite_Glyph; 591 face->forget_glyph_frame = TT_Forget_Glyph_Frame; 592 } 593 594 595 /*************************************************************************/ 596 /* */ 597 /* <Function> */ 598 /* TT_Process_Simple_Glyph */ 599 /* */ 600 /* <Description> */ 601 /* Once a simple glyph has been loaded, it needs to be processed. */ 602 /* Usually, this means scaling and hinting through bytecode */ 603 /* interpretation. */ 604 /* */ 605 static FT_Error 606 TT_Process_Simple_Glyph( TT_Loader* load, 607 FT_Bool debug ) 608 { 609 FT_GlyphLoader* gloader = load->gloader; 610 FT_Outline* outline = &gloader->current.outline; 611 FT_UInt n_points = outline->n_points; 612 FT_UInt n_ins; 613 TT_GlyphZone* zone = &load->zone; 614 FT_Error error = TT_Err_Ok; 615 616 FT_UNUSED( debug ); /* used by truetype interpreter only */ 617 618 619 n_ins = load->glyph->control_len; 620 621 /* add shadow points */ 622 623 /* Now add the two shadow points at n and n + 1. */ 624 /* We need the left side bearing and advance width. */ 625 626 { 627 FT_Vector* pp1; 628 FT_Vector* pp2; 629 630 631 /* pp1 = xMin - lsb */ 632 pp1 = outline->points + n_points; 633 pp1->x = load->bbox.xMin - load->left_bearing; 634 pp1->y = 0; 635 636 /* pp2 = pp1 + aw */ 637 pp2 = pp1 + 1; 638 pp2->x = pp1->x + load->advance; 639 pp2->y = 0; 640 641 outline->tags[n_points ] = 0; 642 outline->tags[n_points + 1] = 0; 643 } 644 645 /* Note that we return two more points that are not */ 646 /* part of the glyph outline. */ 647 648 n_points += 2; 649 650 /* set up zone for hinting */ 651 tt_prepare_zone( zone, &gloader->current, 0, 0 ); 652 653 /* eventually scale the glyph */ 654 if ( !( load->load_flags & FT_LOAD_NO_SCALE ) ) 655 { 656 FT_Vector* vec = zone->cur; 657 FT_Vector* limit = vec + n_points; 658 FT_Fixed x_scale = load->size->metrics.x_scale; 659 FT_Fixed y_scale = load->size->metrics.y_scale; 660 661 662 /* first scale the glyph points */ 663 for ( ; vec < limit; vec++ ) 664 { 665 vec->x = FT_MulFix( vec->x, x_scale ); 666 vec->y = FT_MulFix( vec->y, y_scale ); 667 } 668 } 669 670 cur_to_org( n_points, zone ); 671 672 /* eventually hint the glyph */ 673 if ( IS_HINTED( load->load_flags ) ) 674 { 675 FT_Pos x = zone->org[n_points-2].x; 676 677 678 x = ( ( x + 32 ) & -64 ) - x; 679 translate_array( n_points, zone->org, x, 0 ); 680 681 org_to_cur( n_points, zone ); 682 683 zone->cur[n_points - 1].x = ( zone->cur[n_points - 1].x + 32 ) & -64; 684 685#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 686 687 /* now consider hinting */ 688 if ( n_ins > 0 ) 689 { 690 error = TT_Set_CodeRange( load->exec, tt_coderange_glyph, 691 load->exec->glyphIns, n_ins ); 692 if ( error ) 693 goto Exit; 694 695 load->exec->is_composite = FALSE; 696 load->exec->pedantic_hinting = (FT_Bool)( load->load_flags & 697 FT_LOAD_PEDANTIC ); 698 load->exec->pts = *zone; 699 load->exec->pts.n_points += 2; 700 701 error = TT_Run_Context( load->exec, debug ); 702 if ( error && load->exec->pedantic_hinting ) 703 goto Exit; 704 705 error = TT_Err_Ok; /* ignore bytecode errors in non-pedantic mode */ 706 } 707 708#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 709 710 } 711 712 /* save glyph phantom points */ 713 if ( !load->preserve_pps ) 714 { 715 load->pp1 = zone->cur[n_points - 2]; 716 load->pp2 = zone->cur[n_points - 1]; 717 } 718 719#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 720 Exit: 721#endif 722 return error; 723 } 724 725 726 /*************************************************************************/ 727 /* */ 728 /* <Function> */ 729 /* load_truetype_glyph */ 730 /* */ 731 /* <Description> */ 732 /* Loads a given truetype glyph. Handles composites and uses a */ 733 /* TT_Loader object. */ 734 /* */ 735 static FT_Error 736 load_truetype_glyph( TT_Loader* loader, 737 FT_UInt glyph_index ) 738 { 739 740#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 741 FT_Stream stream = loader->stream; 742#endif 743 744 FT_Error error; 745 TT_Face face = (TT_Face)loader->face; 746 FT_ULong offset; 747 FT_Int contours_count; 748 FT_UInt index, num_points, count; 749 FT_Fixed x_scale, y_scale; 750 FT_GlyphLoader* gloader = loader->gloader; 751 FT_Bool opened_frame = 0; 752 753 754 /* check glyph index */ 755 index = glyph_index; 756 if ( index >= (FT_UInt)face->root.num_glyphs ) 757 { 758 error = TT_Err_Invalid_Glyph_Index; 759 goto Exit; 760 } 761 762 loader->glyph_index = glyph_index; 763 num_points = 0; 764 765 x_scale = 0x10000L; 766 y_scale = 0x10000L; 767 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 768 { 769 x_scale = loader->size->metrics.x_scale; 770 y_scale = loader->size->metrics.y_scale; 771 } 772 773 /* get horizontal metrics */ 774 { 775 FT_Short left_bearing; 776 FT_UShort advance_width; 777 778 779 Get_HMetrics( face, index, 780 (FT_Bool)!(loader->load_flags & 781 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH), 782 &left_bearing, 783 &advance_width ); 784 785 loader->left_bearing = left_bearing; 786 loader->advance = advance_width; 787 788 if ( !loader->linear_def ) 789 { 790 loader->linear_def = 1; 791 loader->linear = advance_width; 792 } 793 } 794 795 offset = face->glyph_locations[index]; 796 count = 0; 797 798 if ( index < (FT_UInt)face->num_locations - 1 ) 799 count = face->glyph_locations[index + 1] - offset; 800 801 if ( count == 0 ) 802 { 803 /* as described by Frederic Loyer, these are spaces, and */ 804 /* not the unknown glyph. */ 805 loader->bbox.xMin = 0; 806 loader->bbox.xMax = 0; 807 loader->bbox.yMin = 0; 808 loader->bbox.yMax = 0; 809 810 loader->pp1.x = 0; 811 loader->pp2.x = loader->advance; 812 813 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 814 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 815 816#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 817 818 if ( loader->exec ) 819 loader->exec->glyphSize = 0; 820 821#endif 822 823 error = TT_Err_Ok; 824 goto Exit; 825 } 826 827 loader->byte_len = (FT_Int)count; 828 829#if 0 830 /* temporary hack */ 831 if ( count < 10 ) 832 { 833 /* This glyph is corrupted -- it does not have a complete header */ 834 error = TT_Err_Invalid_Outline; 835 goto Fail; 836 } 837#endif 838 839 offset = loader->glyf_offset + offset; 840 841 /* access glyph frame */ 842 error = face->access_glyph_frame( loader, glyph_index, offset, count ); 843 if ( error ) 844 goto Exit; 845 846 opened_frame = 1; 847 848 /* read first glyph header */ 849 error = face->read_glyph_header( loader ); 850 if ( error ) 851 goto Fail; 852 853 contours_count = loader->n_contours; 854 855 count -= 10; 856 857 loader->pp1.x = loader->bbox.xMin - loader->left_bearing; 858 loader->pp1.y = 0; 859 loader->pp2.x = loader->pp1.x + loader->advance; 860 loader->pp2.y = 0; 861 862 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 863 { 864 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 865 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 866 } 867 868 /***********************************************************************/ 869 /***********************************************************************/ 870 /***********************************************************************/ 871 872 /* if it is a simple glyph, load it */ 873 874 if ( contours_count >= 0 ) 875 { 876 /* check that we can add the contours to the glyph */ 877 error = FT_GlyphLoader_Check_Points( gloader, 0, contours_count ); 878 if ( error ) 879 goto Fail; 880 881 error = face->read_simple_glyph( loader ); 882 if ( error ) 883 goto Fail; 884 885#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 886 887 { 888 TT_Size size = (TT_Size)loader->size; 889 890 891 error = TT_Process_Simple_Glyph( loader, 892 (FT_Bool)( size && size->debug ) ); 893 } 894 895#else 896 897 error = TT_Process_Simple_Glyph( loader, 0 ); 898 899#endif 900 901 if ( error ) 902 goto Fail; 903 904 FT_GlyphLoader_Add( gloader ); 905 906 /* Note: We could have put the simple loader source there */ 907 /* but the code is fat enough already :-) */ 908 } 909 910 /***********************************************************************/ 911 /***********************************************************************/ 912 /***********************************************************************/ 913 914 /* otherwise, load a composite! */ 915 else 916 { 917 TT_GlyphSlot glyph = (TT_GlyphSlot)loader->glyph; 918 FT_UInt start_point, start_contour; 919 FT_ULong ins_pos; /* position of composite instructions, if any */ 920 921 922 /* for each subglyph, read composite header */ 923 start_point = gloader->base.outline.n_points; 924 start_contour = gloader->base.outline.n_contours; 925 926 error = face->read_composite_glyph( loader ); 927 if ( error ) 928 goto Fail; 929 930 ins_pos = loader->ins_pos; 931 face->forget_glyph_frame( loader ); 932 opened_frame = 0; 933 934 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ 935 /* `as is' in the glyph slot (the client application will be */ 936 /* responsible for interpreting this data)... */ 937 /* */ 938 if ( loader->load_flags & FT_LOAD_NO_RECURSE ) 939 { 940 /* set up remaining glyph fields */ 941 FT_GlyphLoader_Add( gloader ); 942 943 glyph->num_subglyphs = gloader->base.num_subglyphs; 944 glyph->format = ft_glyph_format_composite; 945 glyph->subglyphs = gloader->base.subglyphs; 946 947 goto Exit; 948 } 949 950 /*********************************************************************/ 951 /*********************************************************************/ 952 /*********************************************************************/ 953 954 /* Now, read each subglyph independently. */ 955 { 956 FT_Int n, num_base_points, num_new_points; 957 FT_SubGlyph* subglyph = 0; 958 959 FT_UInt num_subglyphs = gloader->current.num_subglyphs; 960 FT_UInt num_base_subgs = gloader->base.num_subglyphs; 961 962 963 FT_GlyphLoader_Add( gloader ); 964 965 for ( n = 0; n < (FT_Int)num_subglyphs; n++ ) 966 { 967 FT_Vector pp1, pp2; 968 FT_Pos x, y; 969 970 971 /* Each time we call load_truetype_glyph in this loop, the */ 972 /* value of `gloader.base.subglyphs' can change due to table */ 973 /* reallocations. We thus need to recompute the subglyph */ 974 /* pointer on each iteration. */ 975 subglyph = gloader->base.subglyphs + num_base_subgs + n; 976 977 pp1 = loader->pp1; 978 pp2 = loader->pp2; 979 980 num_base_points = gloader->base.outline.n_points; 981 982 error = load_truetype_glyph( loader, subglyph->index ); 983 if ( error ) 984 goto Fail; 985 986 /* restore subglyph pointer */ 987 subglyph = gloader->base.subglyphs + num_base_subgs + n; 988 989 if ( subglyph->flags & USE_MY_METRICS ) 990 { 991 pp1 = loader->pp1; 992 pp2 = loader->pp2; 993 } 994 else 995 { 996 loader->pp1 = pp1; 997 loader->pp2 = pp2; 998 } 999 1000 num_points = gloader->base.outline.n_points; 1001 1002 num_new_points = num_points - num_base_points; 1003 1004 /* now perform the transform required for this subglyph */ 1005 1006 if ( subglyph->flags & ( WE_HAVE_A_SCALE | 1007 WE_HAVE_AN_XY_SCALE | 1008 WE_HAVE_A_2X2 ) ) 1009 { 1010 FT_Vector* cur = gloader->base.outline.points + 1011 num_base_points; 1012 FT_Vector* org = gloader->base.extra_points + 1013 num_base_points; 1014 FT_Vector* limit = cur + num_new_points; 1015 1016 1017 for ( ; cur < limit; cur++, org++ ) 1018 { 1019 FT_Vector_Transform( cur, &subglyph->transform ); 1020 FT_Vector_Transform( org, &subglyph->transform ); 1021 } 1022 } 1023 1024 /* apply offset */ 1025 1026 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) 1027 { 1028 FT_UInt k = subglyph->arg1; 1029 FT_UInt l = subglyph->arg2; 1030 FT_Vector* p1; 1031 FT_Vector* p2; 1032 1033 1034 if ( start_point + k >= (FT_UInt)num_base_points || 1035 l >= (FT_UInt)num_new_points ) 1036 { 1037 error = TT_Err_Invalid_Composite; 1038 goto Fail; 1039 } 1040 1041 l += num_base_points; 1042 1043 p1 = gloader->base.outline.points + start_point + k; 1044 p2 = gloader->base.outline.points + start_point + l; 1045 1046 x = p1->x - p2->x; 1047 y = p1->y - p2->y; 1048 } 1049 else 1050 { 1051 x = subglyph->arg1; 1052 y = subglyph->arg2; 1053 1054 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1055 { 1056 x = FT_MulFix( x, x_scale ); 1057 y = FT_MulFix( y, y_scale ); 1058 1059 if ( subglyph->flags & ROUND_XY_TO_GRID ) 1060 { 1061 x = ( x + 32 ) & -64; 1062 y = ( y + 32 ) & -64; 1063 } 1064 } 1065 } 1066 1067 if ( x | y ) 1068 { 1069 translate_array( num_new_points, 1070 gloader->base.outline.points + num_base_points, 1071 x, y ); 1072 1073 translate_array( num_new_points, 1074 gloader->base.extra_points + num_base_points, 1075 x, y ); 1076 } 1077 } 1078 1079 /*******************************************************************/ 1080 /*******************************************************************/ 1081 /*******************************************************************/ 1082 1083 /* we have finished loading all sub-glyphs; now, look for */ 1084 /* instructions for this composite! */ 1085 1086#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1087 1088 if ( num_subglyphs > 0 && 1089 loader->exec && 1090 ins_pos > 0 && 1091 subglyph->flags & WE_HAVE_INSTR ) 1092 { 1093 FT_UShort n_ins; 1094 TT_ExecContext exec = loader->exec; 1095 TT_GlyphZone* pts; 1096 FT_Vector* pp1; 1097 1098 1099 /* read size of instructions */ 1100 if ( FILE_Seek( ins_pos ) || 1101 READ_UShort( n_ins ) ) 1102 goto Fail; 1103 FT_TRACE5(( " Instructions size = %d\n", n_ins )); 1104 1105 /* in some fonts? */ 1106 if ( n_ins == 0xFFFF ) 1107 n_ins = 0; 1108 1109 /* check it */ 1110 if ( n_ins > face->max_profile.maxSizeOfInstructions ) 1111 { 1112 FT_TRACE0(( "Too many instructions (%d) in composite glyph %ld\n", 1113 n_ins, subglyph->index )); 1114 error = TT_Err_Too_Many_Hints; 1115 goto Fail; 1116 } 1117 1118 /* read the instructions */ 1119 if ( FILE_Read( exec->glyphIns, n_ins ) ) 1120 goto Fail; 1121 1122 glyph->control_data = exec->glyphIns; 1123 glyph->control_len = n_ins; 1124 1125 error = TT_Set_CodeRange( exec, 1126 tt_coderange_glyph, 1127 exec->glyphIns, 1128 n_ins ); 1129 if ( error ) 1130 goto Fail; 1131 1132 /* prepare the execution context */ 1133 tt_prepare_zone( &exec->pts, &gloader->base, 1134 start_point, start_contour ); 1135 pts = &exec->pts; 1136 1137 pts->n_points = (short)(num_points + 2); 1138 pts->n_contours = gloader->base.outline.n_contours; 1139 1140 /* add phantom points */ 1141 pp1 = pts->cur + num_points; 1142 pp1[0] = loader->pp1; 1143 pp1[1] = loader->pp2; 1144 1145 pts->tags[num_points ] = 0; 1146 pts->tags[num_points + 1] = 0; 1147 1148 /* if hinting, round the phantom points */ 1149 if ( IS_HINTED( loader->load_flags ) ) 1150 { 1151 pp1[0].x = ( ( loader->pp1.x + 32 ) & -64 ); 1152 pp1[1].x = ( ( loader->pp2.x + 32 ) & -64 ); 1153 } 1154 1155 { 1156 FT_UInt k; 1157 1158 1159 for ( k = 0; k < num_points; k++ ) 1160 pts->tags[k] &= FT_Curve_Tag_On; 1161 } 1162 1163 cur_to_org( num_points + 2, pts ); 1164 1165 /* now consider hinting */ 1166 if ( IS_HINTED( loader->load_flags ) && n_ins > 0 ) 1167 { 1168 exec->is_composite = TRUE; 1169 exec->pedantic_hinting = 1170 (FT_Bool)( loader->load_flags & FT_LOAD_PEDANTIC ); 1171 1172 error = TT_Run_Context( exec, ((TT_Size)loader->size)->debug ); 1173 if ( error && exec->pedantic_hinting ) 1174 goto Fail; 1175 } 1176 1177 /* save glyph origin and advance points */ 1178 loader->pp1 = pp1[0]; 1179 loader->pp2 = pp1[1]; 1180 } 1181 1182#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1183 1184 } 1185 /* end of composite loading */ 1186 } 1187 1188 /***********************************************************************/ 1189 /***********************************************************************/ 1190 /***********************************************************************/ 1191 1192 Fail: 1193 if ( opened_frame ) 1194 face->forget_glyph_frame( loader ); 1195 1196 Exit: 1197 return error; 1198 } 1199 1200 1201 static void 1202 compute_glyph_metrics( TT_Loader* loader, 1203 FT_UInt glyph_index ) 1204 { 1205 FT_BBox bbox; 1206 TT_Face face = (TT_Face)loader->face; 1207 FT_Fixed y_scale; 1208 TT_GlyphSlot glyph = loader->glyph; 1209 TT_Size size = (TT_Size)loader->size; 1210 1211 1212 y_scale = 0x10000L; 1213 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1214 y_scale = size->root.metrics.y_scale; 1215 1216 if ( glyph->format != ft_glyph_format_composite ) 1217 { 1218 glyph->outline.flags &= ~ft_outline_single_pass; 1219 1220 /* copy outline to our glyph slot */ 1221 FT_GlyphLoader_Copy_Points( glyph->internal->loader, loader->gloader ); 1222 glyph->outline = glyph->internal->loader->base.outline; 1223 1224 /* translate array so that (0,0) is the glyph's origin */ 1225 FT_Outline_Translate( &glyph->outline, -loader->pp1.x, 0 ); 1226 1227 FT_Outline_Get_CBox( &glyph->outline, &bbox ); 1228 1229 if ( IS_HINTED( loader->load_flags ) ) 1230 { 1231 /* grid-fit the bounding box */ 1232 bbox.xMin &= -64; 1233 bbox.yMin &= -64; 1234 bbox.xMax = ( bbox.xMax + 63 ) & -64; 1235 bbox.yMax = ( bbox.yMax + 63 ) & -64; 1236 } 1237 } 1238 else 1239 bbox = loader->bbox; 1240 1241 /* get the device-independent horizontal advance. It is scaled later */ 1242 /* by the base layer. */ 1243 { 1244 FT_Pos advance = loader->linear; 1245 1246 1247 /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */ 1248 /* correctly support DynaLab fonts, which have an incorrect */ 1249 /* `advance_Width_Max' field! It is used, to my knowledge, */ 1250 /* exclusively in the X-TrueType font server. */ 1251 /* */ 1252 if ( face->postscript.isFixedPitch && 1253 ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 ) 1254 advance = face->horizontal.advance_Width_Max; 1255 1256 /* we need to return the advance in font units in linearHoriAdvance, */ 1257 /* it will be scaled later by the base layer. */ 1258 glyph->linearHoriAdvance = advance; 1259 } 1260 1261 glyph->metrics.horiBearingX = bbox.xMin; 1262 glyph->metrics.horiBearingY = bbox.yMax; 1263 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; 1264 1265 /* don't forget to hint the advance when we need to */ 1266 if ( IS_HINTED( loader->load_flags ) ) 1267 glyph->metrics.horiAdvance = ( glyph->metrics.horiAdvance + 32 ) & -64; 1268 1269 /* Now take care of vertical metrics. In the case where there is */ 1270 /* no vertical information within the font (relatively common), make */ 1271 /* up some metrics by `hand'... */ 1272 1273 { 1274 FT_Short top_bearing; /* vertical top side bearing (EM units) */ 1275 FT_UShort advance_height; /* vertical advance height (EM units) */ 1276 1277 FT_Pos left; /* scaled vertical left side bearing */ 1278 FT_Pos top; /* scaled vertical top side bearing */ 1279 FT_Pos advance; /* scaled vertical advance height */ 1280 1281 1282 /* Get the unscaled `tsb' and `ah' */ 1283 if ( face->vertical_info && 1284 face->vertical.number_Of_VMetrics > 0 ) 1285 { 1286 /* Don't assume that both the vertical header and vertical */ 1287 /* metrics are present in the same font :-) */ 1288 1289 TT_Get_Metrics( (TT_HoriHeader*)&face->vertical, 1290 glyph_index, 1291 &top_bearing, 1292 &advance_height ); 1293 } 1294 else 1295 { 1296 /* Make up the distances from the horizontal header. */ 1297 1298 /* NOTE: The OS/2 values are the only `portable' ones, */ 1299 /* which is why we use them, if there is an OS/2 */ 1300 /* table in the font. Otherwise, we use the */ 1301 /* values defined in the horizontal header. */ 1302 /* */ 1303 /* NOTE2: The sTypoDescender is negative, which is why */ 1304 /* we compute the baseline-to-baseline distance */ 1305 /* here with: */ 1306 /* ascender - descender + linegap */ 1307 /* */ 1308 if ( face->os2.version != 0xFFFF ) 1309 { 1310 top_bearing = (FT_Short)( face->os2.sTypoLineGap / 2 ); 1311 advance_height = (FT_UShort)( face->os2.sTypoAscender - 1312 face->os2.sTypoDescender + 1313 face->os2.sTypoLineGap ); 1314 } 1315 else 1316 { 1317 top_bearing = (FT_Short)( face->horizontal.Line_Gap / 2 ); 1318 advance_height = (FT_UShort)( face->horizontal.Ascender + 1319 face->horizontal.Descender + 1320 face->horizontal.Line_Gap ); 1321 } 1322 } 1323 1324 /* We must adjust the top_bearing value from the bounding box given */ 1325 /* in the glyph header to te bounding box calculated with */ 1326 /* FT_Get_Outline_CBox(). */ 1327 1328 /* scale the metrics */ 1329 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1330 { 1331 top = FT_MulFix( top_bearing + loader->bbox.yMax, y_scale ) 1332 - bbox.yMax; 1333 advance = FT_MulFix( advance_height, y_scale ); 1334 } 1335 else 1336 { 1337 top = top_bearing + loader->bbox.yMax - bbox.yMax; 1338 advance = advance_height; 1339 } 1340 1341 /* set the advance height in design units. It is scaled later by */ 1342 /* the base layer. */ 1343 glyph->linearVertAdvance = advance_height; 1344 1345 /* XXX: for now, we have no better algorithm for the lsb, but it */ 1346 /* should work fine. */ 1347 /* */ 1348 left = ( bbox.xMin - bbox.xMax ) / 2; 1349 1350 /* grid-fit them if necessary */ 1351 if ( IS_HINTED( loader->load_flags ) ) 1352 { 1353 left &= -64; 1354 top = ( top + 63 ) & -64; 1355 advance = ( advance + 32 ) & -64; 1356 } 1357 1358 glyph->metrics.vertBearingX = left; 1359 glyph->metrics.vertBearingY = top; 1360 glyph->metrics.vertAdvance = advance; 1361 } 1362 1363 /* adjust advance width to the value contained in the hdmx table */ 1364 if ( !face->postscript.isFixedPitch && size && 1365 IS_HINTED( loader->load_flags ) ) 1366 { 1367 FT_Byte* widths = Get_Advance_Widths( face, 1368 size->root.metrics.x_ppem ); 1369 1370 1371 if ( widths ) 1372 glyph->metrics.horiAdvance = widths[glyph_index] << 6; 1373 } 1374 1375 /* set glyph dimensions */ 1376 glyph->metrics.width = bbox.xMax - bbox.xMin; 1377 glyph->metrics.height = bbox.yMax - bbox.yMin; 1378 } 1379 1380 1381 /*************************************************************************/ 1382 /* */ 1383 /* <Function> */ 1384 /* TT_Load_Glyph */ 1385 /* */ 1386 /* <Description> */ 1387 /* A function used to load a single glyph within a given glyph slot, */ 1388 /* for a given size. */ 1389 /* */ 1390 /* <Input> */ 1391 /* glyph :: A handle to a target slot object where the glyph */ 1392 /* will be loaded. */ 1393 /* */ 1394 /* size :: A handle to the source face size at which the glyph */ 1395 /* must be scaled/loaded. */ 1396 /* */ 1397 /* glyph_index :: The index of the glyph in the font file. */ 1398 /* */ 1399 /* load_flags :: A flag indicating what to load for this glyph. The */ 1400 /* FT_LOAD_XXX constants can be used to control the */ 1401 /* glyph loading process (e.g., whether the outline */ 1402 /* should be scaled, whether to load bitmaps or not, */ 1403 /* whether to hint the outline, etc). */ 1404 /* */ 1405 /* <Return> */ 1406 /* FreeType error code. 0 means success. */ 1407 /* */ 1408 FT_LOCAL_DEF FT_Error 1409 TT_Load_Glyph( TT_Size size, 1410 TT_GlyphSlot glyph, 1411 FT_UShort glyph_index, 1412 FT_UInt load_flags ) 1413 { 1414 SFNT_Interface* sfnt; 1415 TT_Face face; 1416 FT_Stream stream; 1417 FT_Error error; 1418 TT_Loader loader; 1419 1420 1421 face = (TT_Face)glyph->face; 1422 sfnt = (SFNT_Interface*)face->sfnt; 1423 stream = face->root.stream; 1424 error = 0; 1425 1426 if ( !size || ( load_flags & FT_LOAD_NO_SCALE ) || 1427 ( load_flags & FT_LOAD_NO_RECURSE ) ) 1428 { 1429 size = NULL; 1430 load_flags |= FT_LOAD_NO_SCALE | 1431 FT_LOAD_NO_HINTING | 1432 FT_LOAD_NO_BITMAP; 1433 } 1434 1435 glyph->num_subglyphs = 0; 1436 1437#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1438 1439 /* try to load embedded bitmap if any */ 1440 /* */ 1441 /* XXX: The convention should be emphasized in */ 1442 /* the documents because it can be confusing. */ 1443 if ( size && 1444 size->strike_index != 0xFFFF && 1445 sfnt->load_sbits && 1446 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 1447 1448 { 1449 TT_SBit_Metrics metrics; 1450 1451 1452 error = sfnt->load_sbit_image( face, 1453 size->strike_index, 1454 glyph_index, 1455 load_flags, 1456 stream, 1457 &glyph->bitmap, 1458 &metrics ); 1459 if ( !error ) 1460 { 1461 glyph->outline.n_points = 0; 1462 glyph->outline.n_contours = 0; 1463 1464 glyph->metrics.width = (FT_Pos)metrics.width << 6; 1465 glyph->metrics.height = (FT_Pos)metrics.height << 6; 1466 1467 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 1468 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 1469 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 1470 1471 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 1472 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 1473 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 1474 1475 glyph->format = ft_glyph_format_bitmap; 1476 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 1477 { 1478 glyph->bitmap_left = metrics.vertBearingX; 1479 glyph->bitmap_top = metrics.vertBearingY; 1480 } 1481 else 1482 { 1483 glyph->bitmap_left = metrics.horiBearingX; 1484 glyph->bitmap_top = metrics.horiBearingY; 1485 } 1486 return error; 1487 } 1488 } 1489 1490#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 1491 1492 /* return immediately if we only want the embedded bitmaps */ 1493 if ( load_flags & FT_LOAD_SBITS_ONLY ) 1494 return FT_Err_Invalid_Argument; 1495 1496 /* seek to the beginning of the glyph table. For Type 42 fonts */ 1497 /* the table might be accessed from a Postscript stream or something */ 1498 /* else... */ 1499 1500 error = face->goto_table( face, TTAG_glyf, stream, 0 ); 1501 if ( error ) 1502 { 1503 FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" )); 1504 goto Exit; 1505 } 1506 1507 MEM_Set( &loader, 0, sizeof ( loader ) ); 1508 1509 /* update the glyph zone bounds */ 1510 { 1511 FT_GlyphLoader* gloader = FT_FACE_DRIVER(face)->glyph_loader; 1512 1513 1514 loader.gloader = gloader; 1515 1516 FT_GlyphLoader_Rewind( gloader ); 1517 1518 tt_prepare_zone( &loader.zone, &gloader->base, 0, 0 ); 1519 tt_prepare_zone( &loader.base, &gloader->base, 0, 0 ); 1520 } 1521 1522#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1523 1524 if ( size ) 1525 { 1526 /* query new execution context */ 1527 loader.exec = size->debug ? size->context : TT_New_Context( face ); 1528 if ( !loader.exec ) 1529 return TT_Err_Could_Not_Find_Context; 1530 1531 TT_Load_Context( loader.exec, face, size ); 1532 loader.instructions = loader.exec->glyphIns; 1533 1534 /* load default graphics state - if needed */ 1535 if ( size->GS.instruct_control & 2 ) 1536 loader.exec->GS = tt_default_graphics_state; 1537 } 1538 1539#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1540 1541 /* clear all outline flags, except the `owner' one */ 1542 glyph->outline.flags = 0; 1543 1544 if ( size && size->root.metrics.y_ppem < 24 ) 1545 glyph->outline.flags |= ft_outline_high_precision; 1546 1547 /* let's initialize the rest of our loader now */ 1548 1549 loader.load_flags = load_flags; 1550 1551 loader.face = (FT_Face)face; 1552 loader.size = (FT_Size)size; 1553 loader.glyph = (FT_GlyphSlot)glyph; 1554 loader.stream = stream; 1555 1556 loader.glyf_offset = FILE_Pos(); 1557 1558#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1559 1560 /* if the cvt program has disabled hinting, the argument */ 1561 /* is ignored. */ 1562 if ( size && ( size->GS.instruct_control & 1 ) ) 1563 loader.load_flags |= FT_LOAD_NO_HINTING; 1564 1565#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1566 1567 /* Main loading loop */ 1568 glyph->format = ft_glyph_format_outline; 1569 glyph->num_subglyphs = 0; 1570 error = load_truetype_glyph( &loader, glyph_index ); 1571 if ( !error ) 1572 compute_glyph_metrics( &loader, glyph_index ); 1573 1574#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1575 1576 if ( !size || !size->debug ) 1577 TT_Done_Context( loader.exec ); 1578 1579#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1580 1581 Exit: 1582 return error; 1583 } 1584 1585 1586/* END */ 1587