ttgload.c revision f7f82d773b7eac9e5b570a3b64bd0325b0beb62c
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 if ( byte_len < 0 ) 244 return TT_Err_Invalid_Outline; 245 246 loader->n_contours = GET_Short(); 247 248 loader->bbox.xMin = GET_Short(); 249 loader->bbox.yMin = GET_Short(); 250 loader->bbox.xMax = GET_Short(); 251 loader->bbox.yMax = GET_Short(); 252 253 FT_TRACE5(( " # of contours: %d\n", loader->n_contours )); 254 FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin, 255 loader->bbox.xMax )); 256 FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin, 257 loader->bbox.yMax )); 258 loader->byte_len = byte_len; 259 260 return TT_Err_Ok; 261 } 262 263 264 FT_CALLBACK_DEF( FT_Error ) 265 TT_Load_Simple_Glyph( TT_Loader* load ) 266 { 267 FT_Error error; 268 FT_Stream stream = load->stream; 269 FT_GlyphLoader* gloader = load->gloader; 270 FT_Int n_contours = load->n_contours; 271 FT_Outline* outline; 272 TT_Face face = (TT_Face)load->face; 273 TT_GlyphSlot slot = (TT_GlyphSlot)load->glyph; 274 FT_UShort n_ins; 275 FT_Int n, n_points; 276 FT_Int byte_len = load->byte_len; 277 278 279 /* reading the contours endpoints & number of points */ 280 { 281 short* cur = gloader->current.outline.contours; 282 short* limit = cur + n_contours; 283 284 /* check room for contours array + instructions count */ 285 byte_len -= 2*(n_contours+1); 286 if ( byte_len < 0 ) 287 goto Invalid_Outline; 288 289 for ( ; cur < limit; cur++ ) 290 cur[0] = GET_UShort(); 291 292 n_points = 0; 293 if ( n_contours > 0 ) 294 n_points = cur[-1] + 1; 295 296 error = FT_GlyphLoader_Check_Points( gloader, n_points + 2, 0 ); 297 if ( error ) 298 goto Fail; 299 300 /* we'd better check the contours table right now */ 301 outline = &gloader->current.outline; 302 303 for ( cur = outline->contours + 1; cur < limit; cur++ ) 304 if ( cur[-1] >= cur[0] ) 305 goto Invalid_Outline; 306 } 307 308 /* reading the bytecode instructions */ 309 slot->control_len = 0; 310 slot->control_data = 0; 311 312 n_ins = GET_UShort(); 313 314 FT_TRACE5(( " Instructions size: %d\n", n_ins )); 315 316 if ( n_ins > face->max_profile.maxSizeOfInstructions ) 317 { 318 FT_TRACE0(( "ERROR: Too many instructions!\n" )); 319 error = TT_Err_Too_Many_Hints; 320 goto Fail; 321 } 322 323 byte_len -= n_ins; 324 if ( byte_len < 0 ) 325 { 326 FT_TRACE0(( "ERROR: Instruction count mismatch!\n" )); 327 error = TT_Err_Too_Many_Hints; 328 goto Fail; 329 } 330 331#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 332 333 if ( ( load->load_flags & 334 ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) ) == 0 && 335 load->instructions ) 336 { 337 slot->control_len = n_ins; 338 slot->control_data = load->instructions; 339 340 MEM_Copy( load->instructions, stream->cursor, n_ins ); 341 } 342 343#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 344 345 stream->cursor += n_ins; 346 347 /* reading the point tags */ 348 { 349 FT_Byte* flag = (FT_Byte*)outline->tags; 350 FT_Byte* limit = flag + n_points; 351 FT_Byte c, count; 352 353 354 while ( flag < limit ) 355 { 356 if ( --byte_len < 0 ) 357 goto Invalid_Outline; 358 359 *flag++ = c = GET_Byte(); 360 if ( c & 8 ) 361 { 362 if ( --byte_len < 0 ) 363 goto Invalid_Outline; 364 365 count = GET_Byte(); 366 if ( flag + count > limit ) 367 goto Invalid_Outline; 368 369 for ( ; count > 0; count-- ) 370 *flag++ = c; 371 } 372 } 373 374 /* check that there is enough room to load the coordinates */ 375 for ( flag = (FT_Byte*)outline->tags; flag < limit; flag++ ) 376 { 377 if ( *flag & 2 ) 378 byte_len -= 1; 379 else if ( (*flag & 16) == 0 ) 380 byte_len -= 2; 381 382 if ( *flag & 4 ) 383 byte_len -= 1; 384 else if ( (*flag & 32) == 0 ) 385 byte_len -= 2; 386 } 387 388 if ( byte_len < 0 ) 389 goto Invalid_Outline; 390 } 391 392 393 /* reading the X coordinates */ 394 395 { 396 FT_Vector* vec = outline->points; 397 FT_Vector* limit = vec + n_points; 398 FT_Byte* flag = (FT_Byte*)outline->tags; 399 FT_Pos x = 0; 400 401 402 for ( ; vec < limit; vec++, flag++ ) 403 { 404 FT_Pos y = 0; 405 406 407 if ( *flag & 2 ) 408 { 409 y = GET_Byte(); 410 if ( ( *flag & 16 ) == 0 ) 411 y = -y; 412 } 413 else if ( ( *flag & 16 ) == 0 ) 414 y = GET_Short(); 415 416 x += y; 417 vec->x = x; 418 } 419 } 420 421 /* reading the Y coordinates */ 422 423 { 424 FT_Vector* vec = gloader->current.outline.points; 425 FT_Vector* limit = vec + n_points; 426 FT_Byte* flag = (FT_Byte*)outline->tags; 427 FT_Pos x = 0; 428 429 430 for ( ; vec < limit; vec++, flag++ ) 431 { 432 FT_Pos y = 0; 433 434 435 if ( *flag & 4 ) 436 { 437 y = GET_Byte(); 438 if ( ( *flag & 32 ) == 0 ) 439 y = -y; 440 } 441 else if ( ( *flag & 32 ) == 0 ) 442 y = GET_Short(); 443 444 x += y; 445 vec->y = x; 446 } 447 } 448 449 /* clear the touch tags */ 450 for ( n = 0; n < n_points; n++ ) 451 outline->tags[n] &= FT_Curve_Tag_On; 452 453 outline->n_points = (FT_UShort)n_points; 454 outline->n_contours = (FT_Short) n_contours; 455 456 load->byte_len = byte_len; 457 458 Fail: 459 return error; 460 461 Invalid_Outline: 462 error = TT_Err_Invalid_Outline; 463 goto Fail; 464 } 465 466 467 FT_CALLBACK_DEF( FT_Error ) 468 TT_Load_Composite_Glyph( TT_Loader* loader ) 469 { 470 FT_Error error; 471 FT_Stream stream = loader->stream; 472 FT_GlyphLoader* gloader = loader->gloader; 473 FT_SubGlyph* subglyph; 474 FT_UInt num_subglyphs; 475 FT_Int byte_len = loader->byte_len; 476 477 478 num_subglyphs = 0; 479 480 do 481 { 482 FT_Fixed xx, xy, yy, yx; 483 484 485 /* check that we can load a new subglyph */ 486 error = FT_GlyphLoader_Check_Subglyphs( gloader, num_subglyphs + 1 ); 487 if ( error ) 488 goto Fail; 489 490 /* check room */ 491 byte_len -= 4; 492 if ( byte_len < 0 ) 493 goto Invalid_Composite; 494 495 subglyph = gloader->current.subglyphs + num_subglyphs; 496 497 subglyph->arg1 = subglyph->arg2 = 0; 498 499 subglyph->flags = GET_UShort(); 500 subglyph->index = GET_UShort(); 501 502 /* check room */ 503 byte_len -= 2; 504 if ( subglyph->flags & ARGS_ARE_WORDS ) 505 byte_len -= 2; 506 if ( subglyph->flags & WE_HAVE_A_SCALE ) 507 byte_len -= 2; 508 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 509 byte_len -= 4; 510 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 511 byte_len -= 8; 512 513 if ( byte_len < 0 ) 514 goto Invalid_Composite; 515 516 /* read arguments */ 517 if ( subglyph->flags & ARGS_ARE_WORDS ) 518 { 519 subglyph->arg1 = GET_Short(); 520 subglyph->arg2 = GET_Short(); 521 } 522 else 523 { 524 subglyph->arg1 = GET_Char(); 525 subglyph->arg2 = GET_Char(); 526 } 527 528 /* read transform */ 529 xx = yy = 0x10000L; 530 xy = yx = 0; 531 532 if ( subglyph->flags & WE_HAVE_A_SCALE ) 533 { 534 xx = (FT_Fixed)GET_Short() << 2; 535 yy = xx; 536 } 537 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 538 { 539 xx = (FT_Fixed)GET_Short() << 2; 540 yy = (FT_Fixed)GET_Short() << 2; 541 } 542 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 543 { 544 xx = (FT_Fixed)GET_Short() << 2; 545 xy = (FT_Fixed)GET_Short() << 2; 546 yx = (FT_Fixed)GET_Short() << 2; 547 yy = (FT_Fixed)GET_Short() << 2; 548 } 549 550 subglyph->transform.xx = xx; 551 subglyph->transform.xy = xy; 552 subglyph->transform.yx = yx; 553 subglyph->transform.yy = yy; 554 555 num_subglyphs++; 556 557 } while ( subglyph->flags & MORE_COMPONENTS ); 558 559 gloader->current.num_subglyphs = num_subglyphs; 560 561#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 562 { 563 /* we must undo the ACCESS_Frame in order to point to the */ 564 /* composite instructions, if we find some. */ 565 /* we will process them later... */ 566 /* */ 567 loader->ins_pos = (FT_ULong)( FILE_Pos() + 568 stream->cursor - stream->limit ); 569 } 570#endif 571 572 loader->byte_len = byte_len; 573 574 Fail: 575 return error; 576 577 Invalid_Composite: 578 error = TT_Err_Invalid_Composite; 579 goto Fail; 580 } 581 582 583 FT_LOCAL_DEF void 584 TT_Init_Glyph_Loading( TT_Face face ) 585 { 586 face->access_glyph_frame = TT_Access_Glyph_Frame; 587 face->read_glyph_header = TT_Load_Glyph_Header; 588 face->read_simple_glyph = TT_Load_Simple_Glyph; 589 face->read_composite_glyph = TT_Load_Composite_Glyph; 590 face->forget_glyph_frame = TT_Forget_Glyph_Frame; 591 } 592 593 594 /*************************************************************************/ 595 /* */ 596 /* <Function> */ 597 /* TT_Process_Simple_Glyph */ 598 /* */ 599 /* <Description> */ 600 /* Once a simple glyph has been loaded, it needs to be processed. */ 601 /* Usually, this means scaling and hinting through bytecode */ 602 /* interpretation. */ 603 /* */ 604 static FT_Error 605 TT_Process_Simple_Glyph( TT_Loader* load, 606 FT_Bool debug ) 607 { 608 FT_GlyphLoader* gloader = load->gloader; 609 FT_Outline* outline = &gloader->current.outline; 610 FT_UInt n_points = outline->n_points; 611 FT_UInt n_ins; 612 TT_GlyphZone* zone = &load->zone; 613 FT_Error error = TT_Err_Ok; 614 615 FT_UNUSED( debug ); /* used by truetype interpreter only */ 616 617 618 n_ins = load->glyph->control_len; 619 620 /* add shadow points */ 621 622 /* Now add the two shadow points at n and n + 1. */ 623 /* We need the left side bearing and advance width. */ 624 625 { 626 FT_Vector* pp1; 627 FT_Vector* pp2; 628 629 630 /* pp1 = xMin - lsb */ 631 pp1 = outline->points + n_points; 632 pp1->x = load->bbox.xMin - load->left_bearing; 633 pp1->y = 0; 634 635 /* pp2 = pp1 + aw */ 636 pp2 = pp1 + 1; 637 pp2->x = pp1->x + load->advance; 638 pp2->y = 0; 639 640 outline->tags[n_points ] = 0; 641 outline->tags[n_points + 1] = 0; 642 } 643 644 /* Note that we return two more points that are not */ 645 /* part of the glyph outline. */ 646 647 n_points += 2; 648 649 /* set up zone for hinting */ 650 tt_prepare_zone( zone, &gloader->current, 0, 0 ); 651 652 /* eventually scale the glyph */ 653 if ( !( load->load_flags & FT_LOAD_NO_SCALE ) ) 654 { 655 FT_Vector* vec = zone->cur; 656 FT_Vector* limit = vec + n_points; 657 FT_Fixed x_scale = load->size->metrics.x_scale; 658 FT_Fixed y_scale = load->size->metrics.y_scale; 659 660 661 /* first scale the glyph points */ 662 for ( ; vec < limit; vec++ ) 663 { 664 vec->x = FT_MulFix( vec->x, x_scale ); 665 vec->y = FT_MulFix( vec->y, y_scale ); 666 } 667 } 668 669 cur_to_org( n_points, zone ); 670 671 /* eventually hint the glyph */ 672 if ( IS_HINTED( load->load_flags ) ) 673 { 674 FT_Pos x = zone->org[n_points-2].x; 675 676 677 x = ( ( x + 32 ) & -64 ) - x; 678 translate_array( n_points, zone->org, x, 0 ); 679 680 org_to_cur( n_points, zone ); 681 682 zone->cur[n_points - 1].x = ( zone->cur[n_points - 1].x + 32 ) & -64; 683 684#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 685 686 /* now consider hinting */ 687 if ( n_ins > 0 ) 688 { 689 error = TT_Set_CodeRange( load->exec, tt_coderange_glyph, 690 load->exec->glyphIns, n_ins ); 691 if ( error ) 692 goto Exit; 693 694 load->exec->is_composite = FALSE; 695 load->exec->pedantic_hinting = (FT_Bool)( load->load_flags & 696 FT_LOAD_PEDANTIC ); 697 load->exec->pts = *zone; 698 load->exec->pts.n_points += 2; 699 700 error = TT_Run_Context( load->exec, debug ); 701 if ( error && load->exec->pedantic_hinting ) 702 goto Exit; 703 704 error = TT_Err_Ok; /* ignore bytecode errors in non-pedantic mode */ 705 } 706 707#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 708 709 } 710 711 /* save glyph phantom points */ 712 if ( !load->preserve_pps ) 713 { 714 load->pp1 = zone->cur[n_points - 2]; 715 load->pp2 = zone->cur[n_points - 1]; 716 } 717 718#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 719 Exit: 720#endif 721 return error; 722 } 723 724 725 /*************************************************************************/ 726 /* */ 727 /* <Function> */ 728 /* load_truetype_glyph */ 729 /* */ 730 /* <Description> */ 731 /* Loads a given truetype glyph. Handles composites and uses a */ 732 /* TT_Loader object. */ 733 /* */ 734 static FT_Error 735 load_truetype_glyph( TT_Loader* loader, 736 FT_UInt glyph_index ) 737 { 738 739#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 740 FT_Stream stream = loader->stream; 741#endif 742 743 FT_Error error; 744 TT_Face face = (TT_Face)loader->face; 745 FT_ULong offset; 746 FT_Int contours_count; 747 FT_UInt index, num_points, count; 748 FT_Fixed x_scale, y_scale; 749 FT_GlyphLoader* gloader = loader->gloader; 750 FT_Bool opened_frame = 0; 751 752 753 /* check glyph index */ 754 index = glyph_index; 755 if ( index >= (FT_UInt)face->root.num_glyphs ) 756 { 757 error = TT_Err_Invalid_Glyph_Index; 758 goto Exit; 759 } 760 761 loader->glyph_index = glyph_index; 762 num_points = 0; 763 764 x_scale = 0x10000L; 765 y_scale = 0x10000L; 766 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 767 { 768 x_scale = loader->size->metrics.x_scale; 769 y_scale = loader->size->metrics.y_scale; 770 } 771 772 /* get horizontal metrics */ 773 { 774 FT_Short left_bearing; 775 FT_UShort advance_width; 776 777 778 Get_HMetrics( face, index, 779 (FT_Bool)!(loader->load_flags & 780 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH), 781 &left_bearing, 782 &advance_width ); 783 784 loader->left_bearing = left_bearing; 785 loader->advance = advance_width; 786 787 if ( !loader->linear_def ) 788 { 789 loader->linear_def = 1; 790 loader->linear = advance_width; 791 } 792 } 793 794 offset = face->glyph_locations[index]; 795 count = 0; 796 797 if ( index < (FT_UInt)face->num_locations - 1 ) 798 count = face->glyph_locations[index + 1] - offset; 799 800 if ( count == 0 ) 801 { 802 /* as described by Frederic Loyer, these are spaces, and */ 803 /* not the unknown glyph. */ 804 loader->bbox.xMin = 0; 805 loader->bbox.xMax = 0; 806 loader->bbox.yMin = 0; 807 loader->bbox.yMax = 0; 808 809 loader->pp1.x = 0; 810 loader->pp2.x = loader->advance; 811 812 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 813 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 814 815#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 816 817 if ( loader->exec ) 818 loader->exec->glyphSize = 0; 819 820#endif 821 822 error = TT_Err_Ok; 823 goto Exit; 824 } 825 826 loader->byte_len = (FT_Int) count; 827 828#if 0 829 /* temporary hack */ 830 if ( count < 10 ) 831 { 832 /* This glyph is corrupted -- it does not have a complete header */ 833 error = TT_Err_Invalid_Outline; 834 goto Fail; 835 } 836#endif 837 838 offset = loader->glyf_offset + offset; 839 840 /* access glyph frame */ 841 error = face->access_glyph_frame( loader, glyph_index, offset, count ); 842 if ( error ) 843 goto Exit; 844 845 opened_frame = 1; 846 847 /* read first glyph header */ 848 error = face->read_glyph_header( loader ); 849 if ( error ) 850 goto Fail; 851 852 contours_count = loader->n_contours; 853 854 count -= 10; 855 856 loader->pp1.x = loader->bbox.xMin - loader->left_bearing; 857 loader->pp1.y = 0; 858 loader->pp2.x = loader->pp1.x + loader->advance; 859 loader->pp2.y = 0; 860 861 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 862 { 863 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 864 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 865 } 866 867 /***********************************************************************/ 868 /***********************************************************************/ 869 /***********************************************************************/ 870 871 /* if it is a simple glyph, load it */ 872 873 if ( contours_count >= 0 ) 874 { 875 /* check that we can add the contours to the glyph */ 876 error = FT_GlyphLoader_Check_Points( gloader, 0, contours_count ); 877 if ( error ) 878 goto Fail; 879 880 error = face->read_simple_glyph( loader ); 881 if ( error ) 882 goto Fail; 883 884#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 885 886 { 887 TT_Size size = (TT_Size)loader->size; 888 889 890 error = TT_Process_Simple_Glyph( loader, 891 (FT_Bool)( size && size->debug ) ); 892 } 893 894#else 895 896 error = TT_Process_Simple_Glyph( loader, 0 ); 897 898#endif 899 900 if ( error ) 901 goto Fail; 902 903 FT_GlyphLoader_Add( gloader ); 904 905 /* Note: We could have put the simple loader source there */ 906 /* but the code is fat enough already :-) */ 907 } 908 909 /***********************************************************************/ 910 /***********************************************************************/ 911 /***********************************************************************/ 912 913 /* otherwise, load a composite! */ 914 else 915 { 916 TT_GlyphSlot glyph = (TT_GlyphSlot)loader->glyph; 917 FT_UInt start_point, start_contour; 918 FT_ULong ins_pos; /* position of composite instructions, if any */ 919 920 921 /* for each subglyph, read composite header */ 922 start_point = gloader->base.outline.n_points; 923 start_contour = gloader->base.outline.n_contours; 924 925 error = face->read_composite_glyph( loader ); 926 if ( error ) 927 goto Fail; 928 929 ins_pos = loader->ins_pos; 930 face->forget_glyph_frame( loader ); 931 opened_frame = 0; 932 933 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ 934 /* `as is' in the glyph slot (the client application will be */ 935 /* responsible for interpreting this data)... */ 936 /* */ 937 if ( loader->load_flags & FT_LOAD_NO_RECURSE ) 938 { 939 /* set up remaining glyph fields */ 940 FT_GlyphLoader_Add( gloader ); 941 942 glyph->num_subglyphs = gloader->base.num_subglyphs; 943 glyph->format = ft_glyph_format_composite; 944 glyph->subglyphs = gloader->base.subglyphs; 945 946 goto Exit; 947 } 948 949 /*********************************************************************/ 950 /*********************************************************************/ 951 /*********************************************************************/ 952 953 /* Now, read each subglyph independently. */ 954 { 955 FT_Int n, num_base_points, num_new_points; 956 FT_SubGlyph* subglyph = 0; 957 958 FT_UInt num_subglyphs = gloader->current.num_subglyphs; 959 FT_UInt num_base_subgs = gloader->base.num_subglyphs; 960 961 962 FT_GlyphLoader_Add( gloader ); 963 964 for ( n = 0; n < (FT_Int)num_subglyphs; n++ ) 965 { 966 FT_Vector pp1, pp2; 967 FT_Pos x, y; 968 969 970 /* Each time we call load_truetype_glyph in this loop, the */ 971 /* value of `gloader.base.subglyphs' can change due to table */ 972 /* reallocations. We thus need to recompute the subglyph */ 973 /* pointer on each iteration. */ 974 subglyph = gloader->base.subglyphs + num_base_subgs + n; 975 976 pp1 = loader->pp1; 977 pp2 = loader->pp2; 978 979 num_base_points = gloader->base.outline.n_points; 980 981 error = load_truetype_glyph( loader, subglyph->index ); 982 if ( error ) 983 goto Fail; 984 985 /* restore subglyph pointer */ 986 subglyph = gloader->base.subglyphs + num_base_subgs + n; 987 988 if ( subglyph->flags & USE_MY_METRICS ) 989 { 990 pp1 = loader->pp1; 991 pp2 = loader->pp2; 992 } 993 else 994 { 995 loader->pp1 = pp1; 996 loader->pp2 = pp2; 997 } 998 999 num_points = gloader->base.outline.n_points; 1000 1001 num_new_points = num_points - num_base_points; 1002 1003 /* now perform the transform required for this subglyph */ 1004 1005 if ( subglyph->flags & ( WE_HAVE_A_SCALE | 1006 WE_HAVE_AN_XY_SCALE | 1007 WE_HAVE_A_2X2 ) ) 1008 { 1009 FT_Vector* cur = gloader->base.outline.points + 1010 num_base_points; 1011 FT_Vector* org = gloader->base.extra_points + 1012 num_base_points; 1013 FT_Vector* limit = cur + num_new_points; 1014 1015 1016 for ( ; cur < limit; cur++, org++ ) 1017 { 1018 FT_Vector_Transform( cur, &subglyph->transform ); 1019 FT_Vector_Transform( org, &subglyph->transform ); 1020 } 1021 } 1022 1023 /* apply offset */ 1024 1025 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) 1026 { 1027 FT_UInt k = subglyph->arg1; 1028 FT_UInt l = subglyph->arg2; 1029 FT_Vector* p1; 1030 FT_Vector* p2; 1031 1032 1033 if ( start_point + k >= (FT_UInt)num_base_points || 1034 l >= (FT_UInt)num_new_points ) 1035 { 1036 error = TT_Err_Invalid_Composite; 1037 goto Fail; 1038 } 1039 1040 l += num_base_points; 1041 1042 p1 = gloader->base.outline.points + start_point + k; 1043 p2 = gloader->base.outline.points + start_point + l; 1044 1045 x = p1->x - p2->x; 1046 y = p1->y - p2->y; 1047 } 1048 else 1049 { 1050 x = subglyph->arg1; 1051 y = subglyph->arg2; 1052 1053 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1054 { 1055 x = FT_MulFix( x, x_scale ); 1056 y = FT_MulFix( y, y_scale ); 1057 1058 if ( subglyph->flags & ROUND_XY_TO_GRID ) 1059 { 1060 x = ( x + 32 ) & -64; 1061 y = ( y + 32 ) & -64; 1062 } 1063 } 1064 } 1065 1066 if ( x | y ) 1067 { 1068 translate_array( num_new_points, 1069 gloader->base.outline.points + num_base_points, 1070 x, y ); 1071 1072 translate_array( num_new_points, 1073 gloader->base.extra_points + num_base_points, 1074 x, y ); 1075 } 1076 } 1077 1078 /*******************************************************************/ 1079 /*******************************************************************/ 1080 /*******************************************************************/ 1081 1082 /* we have finished loading all sub-glyphs; now, look for */ 1083 /* instructions for this composite! */ 1084 1085#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1086 1087 if ( num_subglyphs > 0 && 1088 loader->exec && 1089 ins_pos > 0 && 1090 subglyph->flags & WE_HAVE_INSTR ) 1091 { 1092 FT_UShort n_ins; 1093 TT_ExecContext exec = loader->exec; 1094 TT_GlyphZone* pts; 1095 FT_Vector* pp1; 1096 1097 1098 /* read size of instructions */ 1099 if ( FILE_Seek( ins_pos ) || 1100 READ_UShort( n_ins ) ) 1101 goto Fail; 1102 FT_TRACE5(( " Instructions size = %d\n", n_ins )); 1103 1104 /* in some fonts? */ 1105 if ( n_ins == 0xFFFF ) 1106 n_ins = 0; 1107 1108 /* check it */ 1109 if ( n_ins > face->max_profile.maxSizeOfInstructions ) 1110 { 1111 FT_TRACE0(( "Too many instructions (%d) in composite glyph %ld\n", 1112 n_ins, subglyph->index )); 1113 error = TT_Err_Too_Many_Hints; 1114 goto Fail; 1115 } 1116 1117 /* read the instructions */ 1118 if ( FILE_Read( exec->glyphIns, n_ins ) ) 1119 goto Fail; 1120 1121 glyph->control_data = exec->glyphIns; 1122 glyph->control_len = n_ins; 1123 1124 error = TT_Set_CodeRange( exec, 1125 tt_coderange_glyph, 1126 exec->glyphIns, 1127 n_ins ); 1128 if ( error ) 1129 goto Fail; 1130 1131 /* prepare the execution context */ 1132 tt_prepare_zone( &exec->pts, &gloader->base, 1133 start_point, start_contour ); 1134 pts = &exec->pts; 1135 1136 pts->n_points = (short)(num_points + 2); 1137 pts->n_contours = gloader->base.outline.n_contours; 1138 1139 /* add phantom points */ 1140 pp1 = pts->cur + num_points; 1141 pp1[0] = loader->pp1; 1142 pp1[1] = loader->pp2; 1143 1144 pts->tags[num_points ] = 0; 1145 pts->tags[num_points + 1] = 0; 1146 1147 /* if hinting, round the phantom points */ 1148 if ( IS_HINTED( loader->load_flags ) ) 1149 { 1150 pp1[0].x = ( ( loader->pp1.x + 32 ) & -64 ); 1151 pp1[1].x = ( ( loader->pp2.x + 32 ) & -64 ); 1152 } 1153 1154 { 1155 FT_UInt k; 1156 1157 1158 for ( k = 0; k < num_points; k++ ) 1159 pts->tags[k] &= FT_Curve_Tag_On; 1160 } 1161 1162 cur_to_org( num_points + 2, pts ); 1163 1164 /* now consider hinting */ 1165 if ( IS_HINTED( loader->load_flags ) && n_ins > 0 ) 1166 { 1167 exec->is_composite = TRUE; 1168 exec->pedantic_hinting = 1169 (FT_Bool)( loader->load_flags & FT_LOAD_PEDANTIC ); 1170 1171 error = TT_Run_Context( exec, ((TT_Size)loader->size)->debug ); 1172 if ( error && exec->pedantic_hinting ) 1173 goto Fail; 1174 } 1175 1176 /* save glyph origin and advance points */ 1177 loader->pp1 = pp1[0]; 1178 loader->pp2 = pp1[1]; 1179 } 1180 1181#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1182 1183 } 1184 /* end of composite loading */ 1185 } 1186 1187 /***********************************************************************/ 1188 /***********************************************************************/ 1189 /***********************************************************************/ 1190 1191 Fail: 1192 if ( opened_frame ) 1193 face->forget_glyph_frame( loader ); 1194 1195 Exit: 1196 return error; 1197 } 1198 1199 1200 static void 1201 compute_glyph_metrics( TT_Loader* loader, 1202 FT_UInt glyph_index ) 1203 { 1204 FT_BBox bbox; 1205 TT_Face face = (TT_Face)loader->face; 1206 FT_Fixed y_scale; 1207 TT_GlyphSlot glyph = loader->glyph; 1208 TT_Size size = (TT_Size)loader->size; 1209 1210 1211 y_scale = 0x10000L; 1212 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1213 y_scale = size->root.metrics.y_scale; 1214 1215 if ( glyph->format != ft_glyph_format_composite ) 1216 { 1217 glyph->outline.flags &= ~ft_outline_single_pass; 1218 1219 /* copy outline to our glyph slot */ 1220 FT_GlyphLoader_Copy_Points( glyph->internal->loader, loader->gloader ); 1221 glyph->outline = glyph->internal->loader->base.outline; 1222 1223 /* translate array so that (0,0) is the glyph's origin */ 1224 FT_Outline_Translate( &glyph->outline, -loader->pp1.x, 0 ); 1225 1226 FT_Outline_Get_CBox( &glyph->outline, &bbox ); 1227 1228 if ( IS_HINTED( loader->load_flags ) ) 1229 { 1230 /* grid-fit the bounding box */ 1231 bbox.xMin &= -64; 1232 bbox.yMin &= -64; 1233 bbox.xMax = ( bbox.xMax + 63 ) & -64; 1234 bbox.yMax = ( bbox.yMax + 63 ) & -64; 1235 } 1236 } 1237 else 1238 bbox = loader->bbox; 1239 1240 /* get the device-independent horizontal advance. It is scaled later */ 1241 /* by the base layer. */ 1242 { 1243 FT_Pos advance = loader->linear; 1244 1245 1246 /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */ 1247 /* correctly support DynaLab fonts, which have an incorrect */ 1248 /* `advance_Width_Max' field! It is used, to my knowledge, */ 1249 /* exclusively in the X-TrueType font server. */ 1250 /* */ 1251 if ( face->postscript.isFixedPitch && 1252 ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 ) 1253 advance = face->horizontal.advance_Width_Max; 1254 1255 /* we need to return the advance in font units in linearHoriAdvance, */ 1256 /* it will be scaled later by the base layer. */ 1257 glyph->linearHoriAdvance = advance; 1258 } 1259 1260 glyph->metrics.horiBearingX = bbox.xMin; 1261 glyph->metrics.horiBearingY = bbox.yMax; 1262 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; 1263 1264 /* don't forget to hint the advance when we need to */ 1265 if ( IS_HINTED( loader->load_flags ) ) 1266 glyph->metrics.horiAdvance = ( glyph->metrics.horiAdvance + 32 ) & -64; 1267 1268 /* Now take care of vertical metrics. In the case where there is */ 1269 /* no vertical information within the font (relatively common), make */ 1270 /* up some metrics by `hand'... */ 1271 1272 { 1273 FT_Short top_bearing; /* vertical top side bearing (EM units) */ 1274 FT_UShort advance_height; /* vertical advance height (EM units) */ 1275 1276 FT_Pos left; /* scaled vertical left side bearing */ 1277 FT_Pos top; /* scaled vertical top side bearing */ 1278 FT_Pos advance; /* scaled vertical advance height */ 1279 1280 1281 /* Get the unscaled `tsb' and `ah' */ 1282 if ( face->vertical_info && 1283 face->vertical.number_Of_VMetrics > 0 ) 1284 { 1285 /* Don't assume that both the vertical header and vertical */ 1286 /* metrics are present in the same font :-) */ 1287 1288 TT_Get_Metrics( (TT_HoriHeader*)&face->vertical, 1289 glyph_index, 1290 &top_bearing, 1291 &advance_height ); 1292 } 1293 else 1294 { 1295 /* Make up the distances from the horizontal header. */ 1296 1297 /* NOTE: The OS/2 values are the only `portable' ones, */ 1298 /* which is why we use them, if there is an OS/2 */ 1299 /* table in the font. Otherwise, we use the */ 1300 /* values defined in the horizontal header. */ 1301 /* */ 1302 /* NOTE2: The sTypoDescender is negative, which is why */ 1303 /* we compute the baseline-to-baseline distance */ 1304 /* here with: */ 1305 /* ascender - descender + linegap */ 1306 /* */ 1307 if ( face->os2.version != 0xFFFF ) 1308 { 1309 top_bearing = (FT_Short)( face->os2.sTypoLineGap / 2 ); 1310 advance_height = (FT_UShort)( face->os2.sTypoAscender - 1311 face->os2.sTypoDescender + 1312 face->os2.sTypoLineGap ); 1313 } 1314 else 1315 { 1316 top_bearing = (FT_Short)( face->horizontal.Line_Gap / 2 ); 1317 advance_height = (FT_UShort)( face->horizontal.Ascender + 1318 face->horizontal.Descender + 1319 face->horizontal.Line_Gap ); 1320 } 1321 } 1322 1323 /* We must adjust the top_bearing value from the bounding box given */ 1324 /* in the glyph header to te bounding box calculated with */ 1325 /* FT_Get_Outline_CBox(). */ 1326 1327 /* scale the metrics */ 1328 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1329 { 1330 top = FT_MulFix( top_bearing + loader->bbox.yMax, y_scale ) 1331 - bbox.yMax; 1332 advance = FT_MulFix( advance_height, y_scale ); 1333 } 1334 else 1335 { 1336 top = top_bearing + loader->bbox.yMax - bbox.yMax; 1337 advance = advance_height; 1338 } 1339 1340 /* set the advance height in design units. It is scaled later by */ 1341 /* the base layer. */ 1342 glyph->linearVertAdvance = advance_height; 1343 1344 /* XXX: for now, we have no better algorithm for the lsb, but it */ 1345 /* should work fine. */ 1346 /* */ 1347 left = ( bbox.xMin - bbox.xMax ) / 2; 1348 1349 /* grid-fit them if necessary */ 1350 if ( IS_HINTED( loader->load_flags ) ) 1351 { 1352 left &= -64; 1353 top = ( top + 63 ) & -64; 1354 advance = ( advance + 32 ) & -64; 1355 } 1356 1357 glyph->metrics.vertBearingX = left; 1358 glyph->metrics.vertBearingY = top; 1359 glyph->metrics.vertAdvance = advance; 1360 } 1361 1362 /* adjust advance width to the value contained in the hdmx table */ 1363 if ( !face->postscript.isFixedPitch && size && 1364 IS_HINTED( loader->load_flags ) ) 1365 { 1366 FT_Byte* widths = Get_Advance_Widths( face, 1367 size->root.metrics.x_ppem ); 1368 1369 1370 if ( widths ) 1371 glyph->metrics.horiAdvance = widths[glyph_index] << 6; 1372 } 1373 1374 /* set glyph dimensions */ 1375 glyph->metrics.width = bbox.xMax - bbox.xMin; 1376 glyph->metrics.height = bbox.yMax - bbox.yMin; 1377 } 1378 1379 1380 /*************************************************************************/ 1381 /* */ 1382 /* <Function> */ 1383 /* TT_Load_Glyph */ 1384 /* */ 1385 /* <Description> */ 1386 /* A function used to load a single glyph within a given glyph slot, */ 1387 /* for a given size. */ 1388 /* */ 1389 /* <Input> */ 1390 /* glyph :: A handle to a target slot object where the glyph */ 1391 /* will be loaded. */ 1392 /* */ 1393 /* size :: A handle to the source face size at which the glyph */ 1394 /* must be scaled/loaded. */ 1395 /* */ 1396 /* glyph_index :: The index of the glyph in the font file. */ 1397 /* */ 1398 /* load_flags :: A flag indicating what to load for this glyph. The */ 1399 /* FT_LOAD_XXX constants can be used to control the */ 1400 /* glyph loading process (e.g., whether the outline */ 1401 /* should be scaled, whether to load bitmaps or not, */ 1402 /* whether to hint the outline, etc). */ 1403 /* */ 1404 /* <Return> */ 1405 /* FreeType error code. 0 means success. */ 1406 /* */ 1407 FT_LOCAL_DEF FT_Error 1408 TT_Load_Glyph( TT_Size size, 1409 TT_GlyphSlot glyph, 1410 FT_UShort glyph_index, 1411 FT_UInt load_flags ) 1412 { 1413 SFNT_Interface* sfnt; 1414 TT_Face face; 1415 FT_Stream stream; 1416 FT_Error error; 1417 TT_Loader loader; 1418 1419 1420 face = (TT_Face)glyph->face; 1421 sfnt = (SFNT_Interface*)face->sfnt; 1422 stream = face->root.stream; 1423 error = 0; 1424 1425 if ( !size || ( load_flags & FT_LOAD_NO_SCALE ) || 1426 ( load_flags & FT_LOAD_NO_RECURSE ) ) 1427 { 1428 size = NULL; 1429 load_flags |= FT_LOAD_NO_SCALE | 1430 FT_LOAD_NO_HINTING | 1431 FT_LOAD_NO_BITMAP; 1432 } 1433 1434 glyph->num_subglyphs = 0; 1435 1436#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1437 1438 /* try to load embedded bitmap if any */ 1439 /* */ 1440 /* XXX: The convention should be emphasized in */ 1441 /* the documents because it can be confusing. */ 1442 if ( size && 1443 size->strike_index != 0xFFFF && 1444 sfnt->load_sbits && 1445 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 1446 1447 { 1448 TT_SBit_Metrics metrics; 1449 1450 1451 error = sfnt->load_sbit_image( face, 1452 size->strike_index, 1453 glyph_index, 1454 load_flags, 1455 stream, 1456 &glyph->bitmap, 1457 &metrics ); 1458 if ( !error ) 1459 { 1460 glyph->outline.n_points = 0; 1461 glyph->outline.n_contours = 0; 1462 1463 glyph->metrics.width = (FT_Pos)metrics.width << 6; 1464 glyph->metrics.height = (FT_Pos)metrics.height << 6; 1465 1466 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 1467 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 1468 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 1469 1470 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 1471 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 1472 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 1473 1474 glyph->format = ft_glyph_format_bitmap; 1475 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 1476 { 1477 glyph->bitmap_left = metrics.vertBearingX; 1478 glyph->bitmap_top = metrics.vertBearingY; 1479 } 1480 else 1481 { 1482 glyph->bitmap_left = metrics.horiBearingX; 1483 glyph->bitmap_top = metrics.horiBearingY; 1484 } 1485 return error; 1486 } 1487 } 1488 1489#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 1490 1491 /* return immediately if we only want the embedded bitmaps */ 1492 if ( load_flags & FT_LOAD_SBITS_ONLY ) 1493 return FT_Err_Invalid_Argument; 1494 1495 /* seek to the beginning of the glyph table. For Type 42 fonts */ 1496 /* the table might be accessed from a Postscript stream or something */ 1497 /* else... */ 1498 1499 error = face->goto_table( face, TTAG_glyf, stream, 0 ); 1500 if ( error ) 1501 { 1502 FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" )); 1503 goto Exit; 1504 } 1505 1506 MEM_Set( &loader, 0, sizeof ( loader ) ); 1507 1508 /* update the glyph zone bounds */ 1509 { 1510 FT_GlyphLoader* gloader = FT_FACE_DRIVER(face)->glyph_loader; 1511 1512 1513 loader.gloader = gloader; 1514 1515 FT_GlyphLoader_Rewind( gloader ); 1516 1517 tt_prepare_zone( &loader.zone, &gloader->base, 0, 0 ); 1518 tt_prepare_zone( &loader.base, &gloader->base, 0, 0 ); 1519 } 1520 1521#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1522 1523 if ( size ) 1524 { 1525 /* query new execution context */ 1526 loader.exec = size->debug ? size->context : TT_New_Context( face ); 1527 if ( !loader.exec ) 1528 return TT_Err_Could_Not_Find_Context; 1529 1530 TT_Load_Context( loader.exec, face, size ); 1531 loader.instructions = loader.exec->glyphIns; 1532 1533 /* load default graphics state - if needed */ 1534 if ( size->GS.instruct_control & 2 ) 1535 loader.exec->GS = tt_default_graphics_state; 1536 } 1537 1538#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1539 1540 /* clear all outline flags, except the `owner' one */ 1541 glyph->outline.flags = 0; 1542 1543 if ( size && size->root.metrics.y_ppem < 24 ) 1544 glyph->outline.flags |= ft_outline_high_precision; 1545 1546 /* let's initialize the rest of our loader now */ 1547 1548 loader.load_flags = load_flags; 1549 1550 loader.face = (FT_Face)face; 1551 loader.size = (FT_Size)size; 1552 loader.glyph = (FT_GlyphSlot)glyph; 1553 loader.stream = stream; 1554 1555 loader.glyf_offset = FILE_Pos(); 1556 1557#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1558 1559 /* if the cvt program has disabled hinting, the argument */ 1560 /* is ignored. */ 1561 if ( size && ( size->GS.instruct_control & 1 ) ) 1562 loader.load_flags |= FT_LOAD_NO_HINTING; 1563 1564#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1565 1566 /* Main loading loop */ 1567 glyph->format = ft_glyph_format_outline; 1568 glyph->num_subglyphs = 0; 1569 error = load_truetype_glyph( &loader, glyph_index ); 1570 if ( !error ) 1571 compute_glyph_metrics( &loader, glyph_index ); 1572 1573#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1574 1575 if ( !size || !size->debug ) 1576 TT_Done_Context( loader.exec ); 1577 1578#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1579 1580 Exit: 1581 return error; 1582 } 1583 1584 1585/* END */ 1586