ttgload.c revision 7d3a26425b35c1b037646667c2889260cae84b21
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 /* idx :: 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 idx, 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 ( idx < (FT_UInt)k ) 95 { 96 longs_m = (TT_LongMetrics )header->long_metrics + idx; 97 *bearing = longs_m->bearing; 98 *advance = longs_m->advance; 99 } 100 else 101 { 102 *bearing = ((TT_ShortMetrics*)header->short_metrics)[idx - 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 idx, 117 FT_Bool check, 118 FT_Short* lsb, 119 FT_UShort* aw ) 120 { 121 TT_Get_Metrics( &face->horizontal, idx, 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 ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( 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 FT_FRAME_EXIT(); 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_CheckPoints( 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_CheckSubGlyphs( 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 FT_FRAME_ENTER 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)( FT_STREAM_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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 613 FT_UInt n_ins; 614#endif 615 TT_GlyphZone zone = &load->zone; 616 FT_Error error = TT_Err_Ok; 617 618 FT_UNUSED( debug ); /* used by truetype interpreter only */ 619 620 621#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 622 n_ins = load->glyph->control_len; 623#endif 624 625 /* add shadow points */ 626 627 /* Now add the two shadow points at n and n + 1. */ 628 /* We need the left side bearing and advance width. */ 629 630 { 631 FT_Vector* pp1; 632 FT_Vector* pp2; 633 634 635 /* pp1 = xMin - lsb */ 636 pp1 = outline->points + n_points; 637 pp1->x = load->bbox.xMin - load->left_bearing; 638 pp1->y = 0; 639 640 /* pp2 = pp1 + aw */ 641 pp2 = pp1 + 1; 642 pp2->x = pp1->x + load->advance; 643 pp2->y = 0; 644 645 outline->tags[n_points ] = 0; 646 outline->tags[n_points + 1] = 0; 647 } 648 649 /* Note that we return two more points that are not */ 650 /* part of the glyph outline. */ 651 652 n_points += 2; 653 654 /* set up zone for hinting */ 655 tt_prepare_zone( zone, &gloader->current, 0, 0 ); 656 657 /* eventually scale the glyph */ 658 if ( !( load->load_flags & FT_LOAD_NO_SCALE ) ) 659 { 660 FT_Vector* vec = zone->cur; 661 FT_Vector* limit = vec + n_points; 662 FT_Fixed x_scale = load->size->metrics.x_scale; 663 FT_Fixed y_scale = load->size->metrics.y_scale; 664 665 666 /* first scale the glyph points */ 667 for ( ; vec < limit; vec++ ) 668 { 669 vec->x = FT_MulFix( vec->x, x_scale ); 670 vec->y = FT_MulFix( vec->y, y_scale ); 671 } 672 } 673 674 cur_to_org( n_points, zone ); 675 676 /* eventually hint the glyph */ 677 if ( IS_HINTED( load->load_flags ) ) 678 { 679 FT_Pos x = zone->org[n_points-2].x; 680 681 682 x = ( ( x + 32 ) & -64 ) - x; 683 translate_array( n_points, zone->org, x, 0 ); 684 685 org_to_cur( n_points, zone ); 686 687 zone->cur[n_points - 1].x = ( zone->cur[n_points - 1].x + 32 ) & -64; 688 689#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 690 691 /* now consider hinting */ 692 if ( n_ins > 0 ) 693 { 694 error = TT_Set_CodeRange( load->exec, tt_coderange_glyph, 695 load->exec->glyphIns, n_ins ); 696 if ( error ) 697 goto Exit; 698 699 load->exec->is_composite = FALSE; 700 load->exec->pedantic_hinting = (FT_Bool)( load->load_flags & 701 FT_LOAD_PEDANTIC ); 702 load->exec->pts = *zone; 703 load->exec->pts.n_points += 2; 704 705 error = TT_Run_Context( load->exec, debug ); 706 if ( error && load->exec->pedantic_hinting ) 707 goto Exit; 708 709 error = TT_Err_Ok; /* ignore bytecode errors in non-pedantic mode */ 710 } 711 712#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 713 714 } 715 716 /* save glyph phantom points */ 717 if ( !load->preserve_pps ) 718 { 719 load->pp1 = zone->cur[n_points - 2]; 720 load->pp2 = zone->cur[n_points - 1]; 721 } 722 723#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 724 Exit: 725#endif 726 return error; 727 } 728 729 730 /*************************************************************************/ 731 /* */ 732 /* <Function> */ 733 /* load_truetype_glyph */ 734 /* */ 735 /* <Description> */ 736 /* Loads a given truetype glyph. Handles composites and uses a */ 737 /* TT_Loader object. */ 738 /* */ 739 static FT_Error 740 load_truetype_glyph( TT_Loader loader, 741 FT_UInt glyph_index ) 742 { 743 744#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 745 FT_Stream stream = loader->stream; 746#endif 747 748 FT_Error error; 749 TT_Face face = (TT_Face)loader->face; 750 FT_ULong offset; 751 FT_Int contours_count; 752 FT_UInt idx, num_points, count; 753 FT_Fixed x_scale, y_scale; 754 FT_GlyphLoader gloader = loader->gloader; 755 FT_Bool opened_frame = 0; 756 757 758 /* check glyph index */ 759 idx = glyph_index; 760 if ( idx >= (FT_UInt)face->root.num_glyphs ) 761 { 762 error = TT_Err_Invalid_Glyph_Index; 763 goto Exit; 764 } 765 766 loader->glyph_index = glyph_index; 767 num_points = 0; 768 769 x_scale = 0x10000L; 770 y_scale = 0x10000L; 771 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 772 { 773 x_scale = loader->size->metrics.x_scale; 774 y_scale = loader->size->metrics.y_scale; 775 } 776 777 /* get horizontal metrics */ 778 { 779 FT_Short left_bearing; 780 FT_UShort advance_width; 781 782 783 Get_HMetrics( face, idx, 784 (FT_Bool)!(loader->load_flags & 785 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH), 786 &left_bearing, 787 &advance_width ); 788 789 loader->left_bearing = left_bearing; 790 loader->advance = advance_width; 791 792 if ( !loader->linear_def ) 793 { 794 loader->linear_def = 1; 795 loader->linear = advance_width; 796 } 797 } 798 799 offset = face->glyph_locations[idx]; 800 count = 0; 801 802 if ( idx < (FT_UInt)face->num_locations - 1 ) 803 count = face->glyph_locations[idx + 1] - offset; 804 805 if ( count == 0 ) 806 { 807 /* as described by Frederic Loyer, these are spaces, and */ 808 /* not the unknown glyph. */ 809 loader->bbox.xMin = 0; 810 loader->bbox.xMax = 0; 811 loader->bbox.yMin = 0; 812 loader->bbox.yMax = 0; 813 814 loader->pp1.x = 0; 815 loader->pp2.x = loader->advance; 816 817 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 818 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 819 820#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 821 822 if ( loader->exec ) 823 loader->exec->glyphSize = 0; 824 825#endif 826 827 error = TT_Err_Ok; 828 goto Exit; 829 } 830 831 loader->byte_len = (FT_Int)count; 832 833#if 0 834 /* temporary hack */ 835 if ( count < 10 ) 836 { 837 /* This glyph is corrupted -- it does not have a complete header */ 838 error = TT_Err_Invalid_Outline; 839 goto Fail; 840 } 841#endif 842 843 offset = loader->glyf_offset + offset; 844 845 /* access glyph frame */ 846 error = face->access_glyph_frame( loader, glyph_index, offset, count ); 847 if ( error ) 848 goto Exit; 849 850 opened_frame = 1; 851 852 /* read first glyph header */ 853 error = face->read_glyph_header( loader ); 854 if ( error ) 855 goto Fail; 856 857 contours_count = loader->n_contours; 858 859 count -= 10; 860 861 loader->pp1.x = loader->bbox.xMin - loader->left_bearing; 862 loader->pp1.y = 0; 863 loader->pp2.x = loader->pp1.x + loader->advance; 864 loader->pp2.y = 0; 865 866 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 867 { 868 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 869 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 870 } 871 872 /***********************************************************************/ 873 /***********************************************************************/ 874 /***********************************************************************/ 875 876 /* if it is a simple glyph, load it */ 877 878 if ( contours_count >= 0 ) 879 { 880 /* check that we can add the contours to the glyph */ 881 error = FT_GlyphLoader_CheckPoints( gloader, 0, contours_count ); 882 if ( error ) 883 goto Fail; 884 885 error = face->read_simple_glyph( loader ); 886 if ( error ) 887 goto Fail; 888 889#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 890 891 { 892 TT_Size size = (TT_Size)loader->size; 893 894 895 error = TT_Process_Simple_Glyph( loader, 896 (FT_Bool)( size && size->debug ) ); 897 } 898 899#else 900 901 error = TT_Process_Simple_Glyph( loader, 0 ); 902 903#endif 904 905 if ( error ) 906 goto Fail; 907 908 FT_GlyphLoader_Add( gloader ); 909 910 /* Note: We could have put the simple loader source there */ 911 /* but the code is fat enough already :-) */ 912 } 913 914 /***********************************************************************/ 915 /***********************************************************************/ 916 /***********************************************************************/ 917 918 /* otherwise, load a composite! */ 919 else 920 { 921 TT_GlyphSlot glyph = (TT_GlyphSlot)loader->glyph; 922 FT_UInt start_point; 923#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 924 FT_UInt start_contour; 925 FT_ULong ins_pos; /* position of composite instructions, if any */ 926#endif 927 928 929 /* for each subglyph, read composite header */ 930 start_point = gloader->base.outline.n_points; 931#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 932 start_contour = gloader->base.outline.n_contours; 933#endif 934 935 error = face->read_composite_glyph( loader ); 936 if ( error ) 937 goto Fail; 938 939#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 940 ins_pos = loader->ins_pos; 941#endif 942 face->forget_glyph_frame( loader ); 943 opened_frame = 0; 944 945 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ 946 /* `as is' in the glyph slot (the client application will be */ 947 /* responsible for interpreting this data)... */ 948 /* */ 949 if ( loader->load_flags & FT_LOAD_NO_RECURSE ) 950 { 951 /* set up remaining glyph fields */ 952 FT_GlyphLoader_Add( gloader ); 953 954 glyph->num_subglyphs = gloader->base.num_subglyphs; 955 glyph->format = ft_glyph_format_composite; 956 glyph->subglyphs = gloader->base.subglyphs; 957 958 goto Exit; 959 } 960 961 /*********************************************************************/ 962 /*********************************************************************/ 963 /*********************************************************************/ 964 965 /* Now, read each subglyph independently. */ 966 { 967 FT_Int n, num_base_points, num_new_points; 968 FT_SubGlyph subglyph = 0; 969 970 FT_UInt num_subglyphs = gloader->current.num_subglyphs; 971 FT_UInt num_base_subgs = gloader->base.num_subglyphs; 972 973 974 FT_GlyphLoader_Add( gloader ); 975 976 for ( n = 0; n < (FT_Int)num_subglyphs; n++ ) 977 { 978 FT_Vector pp1, pp2; 979 FT_Pos x, y; 980 981 982 /* Each time we call load_truetype_glyph in this loop, the */ 983 /* value of `gloader.base.subglyphs' can change due to table */ 984 /* reallocations. We thus need to recompute the subglyph */ 985 /* pointer on each iteration. */ 986 subglyph = gloader->base.subglyphs + num_base_subgs + n; 987 988 pp1 = loader->pp1; 989 pp2 = loader->pp2; 990 991 num_base_points = gloader->base.outline.n_points; 992 993 error = load_truetype_glyph( loader, subglyph->index ); 994 if ( error ) 995 goto Fail; 996 997 /* restore subglyph pointer */ 998 subglyph = gloader->base.subglyphs + num_base_subgs + n; 999 1000 if ( subglyph->flags & USE_MY_METRICS ) 1001 { 1002 pp1 = loader->pp1; 1003 pp2 = loader->pp2; 1004 } 1005 else 1006 { 1007 loader->pp1 = pp1; 1008 loader->pp2 = pp2; 1009 } 1010 1011 num_points = gloader->base.outline.n_points; 1012 1013 num_new_points = num_points - num_base_points; 1014 1015 /* now perform the transform required for this subglyph */ 1016 1017 if ( subglyph->flags & ( WE_HAVE_A_SCALE | 1018 WE_HAVE_AN_XY_SCALE | 1019 WE_HAVE_A_2X2 ) ) 1020 { 1021 FT_Vector* cur = gloader->base.outline.points + 1022 num_base_points; 1023 FT_Vector* org = gloader->base.extra_points + 1024 num_base_points; 1025 FT_Vector* limit = cur + num_new_points; 1026 1027 1028 for ( ; cur < limit; cur++, org++ ) 1029 { 1030 FT_Vector_Transform( cur, &subglyph->transform ); 1031 FT_Vector_Transform( org, &subglyph->transform ); 1032 } 1033 } 1034 1035 /* apply offset */ 1036 1037 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) 1038 { 1039 FT_UInt k = subglyph->arg1; 1040 FT_UInt l = subglyph->arg2; 1041 FT_Vector* p1; 1042 FT_Vector* p2; 1043 1044 1045 if ( start_point + k >= (FT_UInt)num_base_points || 1046 l >= (FT_UInt)num_new_points ) 1047 { 1048 error = TT_Err_Invalid_Composite; 1049 goto Fail; 1050 } 1051 1052 l += num_base_points; 1053 1054 p1 = gloader->base.outline.points + start_point + k; 1055 p2 = gloader->base.outline.points + start_point + l; 1056 1057 x = p1->x - p2->x; 1058 y = p1->y - p2->y; 1059 } 1060 else 1061 { 1062 x = subglyph->arg1; 1063 y = subglyph->arg2; 1064 1065 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1066 { 1067 x = FT_MulFix( x, x_scale ); 1068 y = FT_MulFix( y, y_scale ); 1069 1070 if ( subglyph->flags & ROUND_XY_TO_GRID ) 1071 { 1072 x = ( x + 32 ) & -64; 1073 y = ( y + 32 ) & -64; 1074 } 1075 } 1076 } 1077 1078 if ( x | y ) 1079 { 1080 translate_array( num_new_points, 1081 gloader->base.outline.points + num_base_points, 1082 x, y ); 1083 1084 translate_array( num_new_points, 1085 gloader->base.extra_points + num_base_points, 1086 x, y ); 1087 } 1088 } 1089 1090 /*******************************************************************/ 1091 /*******************************************************************/ 1092 /*******************************************************************/ 1093 1094 /* we have finished loading all sub-glyphs; now, look for */ 1095 /* instructions for this composite! */ 1096 1097#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1098 1099 if ( num_subglyphs > 0 && 1100 loader->exec && 1101 ins_pos > 0 && 1102 subglyph->flags & WE_HAVE_INSTR ) 1103 { 1104 FT_UShort n_ins; 1105 TT_ExecContext exec = loader->exec; 1106 TT_GlyphZone pts; 1107 FT_Vector* pp1; 1108 1109 1110 /* read size of instructions */ 1111 if ( FT_STREAM_SEEK( ins_pos ) || 1112 READ_UShort( n_ins ) ) 1113 goto Fail; 1114 FT_TRACE5(( " Instructions size = %d\n", n_ins )); 1115 1116 /* in some fonts? */ 1117 if ( n_ins == 0xFFFF ) 1118 n_ins = 0; 1119 1120 /* check it */ 1121 if ( n_ins > face->max_profile.maxSizeOfInstructions ) 1122 { 1123 FT_TRACE0(( "Too many instructions (%d) in composite glyph %ld\n", 1124 n_ins, subglyph->index )); 1125 error = TT_Err_Too_Many_Hints; 1126 goto Fail; 1127 } 1128 1129 /* read the instructions */ 1130 if ( FT_STREAM_READ( exec->glyphIns, n_ins ) ) 1131 goto Fail; 1132 1133 glyph->control_data = exec->glyphIns; 1134 glyph->control_len = n_ins; 1135 1136 error = TT_Set_CodeRange( exec, 1137 tt_coderange_glyph, 1138 exec->glyphIns, 1139 n_ins ); 1140 if ( error ) 1141 goto Fail; 1142 1143 /* prepare the execution context */ 1144 tt_prepare_zone( &exec->pts, &gloader->base, 1145 start_point, start_contour ); 1146 pts = &exec->pts; 1147 1148 pts->n_points = (short)(num_points + 2); 1149 pts->n_contours = gloader->base.outline.n_contours; 1150 1151 /* add phantom points */ 1152 pp1 = pts->cur + num_points; 1153 pp1[0] = loader->pp1; 1154 pp1[1] = loader->pp2; 1155 1156 pts->tags[num_points ] = 0; 1157 pts->tags[num_points + 1] = 0; 1158 1159 /* if hinting, round the phantom points */ 1160 if ( IS_HINTED( loader->load_flags ) ) 1161 { 1162 pp1[0].x = ( ( loader->pp1.x + 32 ) & -64 ); 1163 pp1[1].x = ( ( loader->pp2.x + 32 ) & -64 ); 1164 } 1165 1166 { 1167 FT_UInt k; 1168 1169 1170 for ( k = 0; k < num_points; k++ ) 1171 pts->tags[k] &= FT_Curve_Tag_On; 1172 } 1173 1174 cur_to_org( num_points + 2, pts ); 1175 1176 /* now consider hinting */ 1177 if ( IS_HINTED( loader->load_flags ) && n_ins > 0 ) 1178 { 1179 exec->is_composite = TRUE; 1180 exec->pedantic_hinting = 1181 (FT_Bool)( loader->load_flags & FT_LOAD_PEDANTIC ); 1182 1183 error = TT_Run_Context( exec, ((TT_Size)loader->size)->debug ); 1184 if ( error && exec->pedantic_hinting ) 1185 goto Fail; 1186 } 1187 1188 /* save glyph origin and advance points */ 1189 loader->pp1 = pp1[0]; 1190 loader->pp2 = pp1[1]; 1191 } 1192 1193#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1194 1195 } 1196 /* end of composite loading */ 1197 } 1198 1199 /***********************************************************************/ 1200 /***********************************************************************/ 1201 /***********************************************************************/ 1202 1203 Fail: 1204 if ( opened_frame ) 1205 face->forget_glyph_frame( loader ); 1206 1207 Exit: 1208 return error; 1209 } 1210 1211 1212 static void 1213 compute_glyph_metrics( TT_Loader loader, 1214 FT_UInt glyph_index ) 1215 { 1216 FT_BBox bbox; 1217 TT_Face face = (TT_Face)loader->face; 1218 FT_Fixed y_scale; 1219 TT_GlyphSlot glyph = loader->glyph; 1220 TT_Size size = (TT_Size)loader->size; 1221 1222 1223 y_scale = 0x10000L; 1224 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1225 y_scale = size->root.metrics.y_scale; 1226 1227 if ( glyph->format != ft_glyph_format_composite ) 1228 { 1229 glyph->outline.flags &= ~ft_outline_single_pass; 1230 1231 /* copy outline to our glyph slot */ 1232 FT_GlyphLoader_CopyPoints( glyph->internal->loader, loader->gloader ); 1233 glyph->outline = glyph->internal->loader->base.outline; 1234 1235 /* translate array so that (0,0) is the glyph's origin */ 1236 FT_Outline_Translate( &glyph->outline, -loader->pp1.x, 0 ); 1237 1238 FT_Outline_Get_CBox( &glyph->outline, &bbox ); 1239 1240 if ( IS_HINTED( loader->load_flags ) ) 1241 { 1242 /* grid-fit the bounding box */ 1243 bbox.xMin &= -64; 1244 bbox.yMin &= -64; 1245 bbox.xMax = ( bbox.xMax + 63 ) & -64; 1246 bbox.yMax = ( bbox.yMax + 63 ) & -64; 1247 } 1248 } 1249 else 1250 bbox = loader->bbox; 1251 1252 /* get the device-independent horizontal advance. It is scaled later */ 1253 /* by the base layer. */ 1254 { 1255 FT_Pos advance = loader->linear; 1256 1257 1258 /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */ 1259 /* correctly support DynaLab fonts, which have an incorrect */ 1260 /* `advance_Width_Max' field! It is used, to my knowledge, */ 1261 /* exclusively in the X-TrueType font server. */ 1262 /* */ 1263 if ( face->postscript.isFixedPitch && 1264 ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 ) 1265 advance = face->horizontal.advance_Width_Max; 1266 1267 /* we need to return the advance in font units in linearHoriAdvance, */ 1268 /* it will be scaled later by the base layer. */ 1269 glyph->linearHoriAdvance = advance; 1270 } 1271 1272 glyph->metrics.horiBearingX = bbox.xMin; 1273 glyph->metrics.horiBearingY = bbox.yMax; 1274 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; 1275 1276 /* don't forget to hint the advance when we need to */ 1277 if ( IS_HINTED( loader->load_flags ) ) 1278 glyph->metrics.horiAdvance = ( glyph->metrics.horiAdvance + 32 ) & -64; 1279 1280 /* Now take care of vertical metrics. In the case where there is */ 1281 /* no vertical information within the font (relatively common), make */ 1282 /* up some metrics by `hand'... */ 1283 1284 { 1285 FT_Short top_bearing; /* vertical top side bearing (EM units) */ 1286 FT_UShort advance_height; /* vertical advance height (EM units) */ 1287 1288 FT_Pos left; /* scaled vertical left side bearing */ 1289 FT_Pos top; /* scaled vertical top side bearing */ 1290 FT_Pos advance; /* scaled vertical advance height */ 1291 1292 1293 /* Get the unscaled `tsb' and `ah' */ 1294 if ( face->vertical_info && 1295 face->vertical.number_Of_VMetrics > 0 ) 1296 { 1297 /* Don't assume that both the vertical header and vertical */ 1298 /* metrics are present in the same font :-) */ 1299 1300 TT_Get_Metrics( (TT_HoriHeader*)&face->vertical, 1301 glyph_index, 1302 &top_bearing, 1303 &advance_height ); 1304 } 1305 else 1306 { 1307 /* Make up the distances from the horizontal header. */ 1308 1309 /* NOTE: The OS/2 values are the only `portable' ones, */ 1310 /* which is why we use them, if there is an OS/2 */ 1311 /* table in the font. Otherwise, we use the */ 1312 /* values defined in the horizontal header. */ 1313 /* */ 1314 /* NOTE2: The sTypoDescender is negative, which is why */ 1315 /* we compute the baseline-to-baseline distance */ 1316 /* here with: */ 1317 /* ascender - descender + linegap */ 1318 /* */ 1319 if ( face->os2.version != 0xFFFF ) 1320 { 1321 top_bearing = (FT_Short)( face->os2.sTypoLineGap / 2 ); 1322 advance_height = (FT_UShort)( face->os2.sTypoAscender - 1323 face->os2.sTypoDescender + 1324 face->os2.sTypoLineGap ); 1325 } 1326 else 1327 { 1328 top_bearing = (FT_Short)( face->horizontal.Line_Gap / 2 ); 1329 advance_height = (FT_UShort)( face->horizontal.Ascender + 1330 face->horizontal.Descender + 1331 face->horizontal.Line_Gap ); 1332 } 1333 } 1334 1335 /* We must adjust the top_bearing value from the bounding box given */ 1336 /* in the glyph header to te bounding box calculated with */ 1337 /* FT_Get_Outline_CBox(). */ 1338 1339 /* scale the metrics */ 1340 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1341 { 1342 top = FT_MulFix( top_bearing + loader->bbox.yMax, y_scale ) 1343 - bbox.yMax; 1344 advance = FT_MulFix( advance_height, y_scale ); 1345 } 1346 else 1347 { 1348 top = top_bearing + loader->bbox.yMax - bbox.yMax; 1349 advance = advance_height; 1350 } 1351 1352 /* set the advance height in design units. It is scaled later by */ 1353 /* the base layer. */ 1354 glyph->linearVertAdvance = advance_height; 1355 1356 /* XXX: for now, we have no better algorithm for the lsb, but it */ 1357 /* should work fine. */ 1358 /* */ 1359 left = ( bbox.xMin - bbox.xMax ) / 2; 1360 1361 /* grid-fit them if necessary */ 1362 if ( IS_HINTED( loader->load_flags ) ) 1363 { 1364 left &= -64; 1365 top = ( top + 63 ) & -64; 1366 advance = ( advance + 32 ) & -64; 1367 } 1368 1369 glyph->metrics.vertBearingX = left; 1370 glyph->metrics.vertBearingY = top; 1371 glyph->metrics.vertAdvance = advance; 1372 } 1373 1374 /* adjust advance width to the value contained in the hdmx table */ 1375 if ( !face->postscript.isFixedPitch && size && 1376 IS_HINTED( loader->load_flags ) ) 1377 { 1378 FT_Byte* widths = Get_Advance_Widths( face, 1379 size->root.metrics.x_ppem ); 1380 1381 1382 if ( widths ) 1383 glyph->metrics.horiAdvance = widths[glyph_index] << 6; 1384 } 1385 1386 /* set glyph dimensions */ 1387 glyph->metrics.width = bbox.xMax - bbox.xMin; 1388 glyph->metrics.height = bbox.yMax - bbox.yMin; 1389 } 1390 1391 1392 /*************************************************************************/ 1393 /* */ 1394 /* <Function> */ 1395 /* TT_Load_Glyph */ 1396 /* */ 1397 /* <Description> */ 1398 /* A function used to load a single glyph within a given glyph slot, */ 1399 /* for a given size. */ 1400 /* */ 1401 /* <Input> */ 1402 /* glyph :: A handle to a target slot object where the glyph */ 1403 /* will be loaded. */ 1404 /* */ 1405 /* size :: A handle to the source face size at which the glyph */ 1406 /* must be scaled/loaded. */ 1407 /* */ 1408 /* glyph_index :: The index of the glyph in the font file. */ 1409 /* */ 1410 /* load_flags :: A flag indicating what to load for this glyph. The */ 1411 /* FT_LOAD_XXX constants can be used to control the */ 1412 /* glyph loading process (e.g., whether the outline */ 1413 /* should be scaled, whether to load bitmaps or not, */ 1414 /* whether to hint the outline, etc). */ 1415 /* */ 1416 /* <Return> */ 1417 /* FreeType error code. 0 means success. */ 1418 /* */ 1419 FT_LOCAL_DEF( FT_Error ) 1420 TT_Load_Glyph( TT_Size size, 1421 TT_GlyphSlot glyph, 1422 FT_UShort glyph_index, 1423 FT_UInt load_flags ) 1424 { 1425 SFNT_Service sfnt; 1426 TT_Face face; 1427 FT_Stream stream; 1428 FT_Error error; 1429 TT_LoaderRec loader; 1430 1431 1432 face = (TT_Face)glyph->face; 1433 sfnt = (SFNT_Service)face->sfnt; 1434 stream = face->root.stream; 1435 error = 0; 1436 1437 if ( !size || ( load_flags & FT_LOAD_NO_SCALE ) || 1438 ( load_flags & FT_LOAD_NO_RECURSE ) ) 1439 { 1440 size = NULL; 1441 load_flags |= FT_LOAD_NO_SCALE | 1442 FT_LOAD_NO_HINTING | 1443 FT_LOAD_NO_BITMAP; 1444 } 1445 1446 glyph->num_subglyphs = 0; 1447 1448#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1449 1450 /* try to load embedded bitmap if any */ 1451 /* */ 1452 /* XXX: The convention should be emphasized in */ 1453 /* the documents because it can be confusing. */ 1454 if ( size && 1455 size->strike_index != 0xFFFF && 1456 sfnt->load_sbits && 1457 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 1458 1459 { 1460 TT_SBit_MetricsRec metrics; 1461 1462 1463 error = sfnt->load_sbit_image( face, 1464 size->strike_index, 1465 glyph_index, 1466 load_flags, 1467 stream, 1468 &glyph->bitmap, 1469 &metrics ); 1470 if ( !error ) 1471 { 1472 glyph->outline.n_points = 0; 1473 glyph->outline.n_contours = 0; 1474 1475 glyph->metrics.width = (FT_Pos)metrics.width << 6; 1476 glyph->metrics.height = (FT_Pos)metrics.height << 6; 1477 1478 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 1479 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 1480 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 1481 1482 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 1483 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 1484 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 1485 1486 glyph->format = ft_glyph_format_bitmap; 1487 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 1488 { 1489 glyph->bitmap_left = metrics.vertBearingX; 1490 glyph->bitmap_top = metrics.vertBearingY; 1491 } 1492 else 1493 { 1494 glyph->bitmap_left = metrics.horiBearingX; 1495 glyph->bitmap_top = metrics.horiBearingY; 1496 } 1497 return error; 1498 } 1499 } 1500 1501#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 1502 1503 /* return immediately if we only want the embedded bitmaps */ 1504 if ( load_flags & FT_LOAD_SBITS_ONLY ) 1505 return FT_Err_Invalid_Argument; 1506 1507 /* seek to the beginning of the glyph table. For Type 42 fonts */ 1508 /* the table might be accessed from a Postscript stream or something */ 1509 /* else... */ 1510 1511 error = face->goto_table( face, TTAG_glyf, stream, 0 ); 1512 if ( error ) 1513 { 1514 FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" )); 1515 goto Exit; 1516 } 1517 1518 MEM_Set( &loader, 0, sizeof ( loader ) ); 1519 1520 /* update the glyph zone bounds */ 1521 { 1522 FT_GlyphLoader gloader = FT_FACE_DRIVER(face)->glyph_loader; 1523 1524 1525 loader.gloader = gloader; 1526 1527 FT_GlyphLoader_Rewind( gloader ); 1528 1529 tt_prepare_zone( &loader.zone, &gloader->base, 0, 0 ); 1530 tt_prepare_zone( &loader.base, &gloader->base, 0, 0 ); 1531 } 1532 1533#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1534 1535 if ( size ) 1536 { 1537 /* query new execution context */ 1538 loader.exec = size->debug ? size->context : TT_New_Context( face ); 1539 if ( !loader.exec ) 1540 return TT_Err_Could_Not_Find_Context; 1541 1542 TT_Load_Context( loader.exec, face, size ); 1543 loader.instructions = loader.exec->glyphIns; 1544 1545 /* load default graphics state - if needed */ 1546 if ( size->GS.instruct_control & 2 ) 1547 loader.exec->GS = tt_default_graphics_state; 1548 } 1549 1550#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1551 1552 /* clear all outline flags, except the `owner' one */ 1553 glyph->outline.flags = 0; 1554 1555 if ( size && size->root.metrics.y_ppem < 24 ) 1556 glyph->outline.flags |= ft_outline_high_precision; 1557 1558 /* let's initialize the rest of our loader now */ 1559 1560 loader.load_flags = load_flags; 1561 1562 loader.face = (FT_Face)face; 1563 loader.size = (FT_Size)size; 1564 loader.glyph = (FT_GlyphSlot)glyph; 1565 loader.stream = stream; 1566 1567 loader.glyf_offset = FT_STREAM_POS(); 1568 1569#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1570 1571 /* if the cvt program has disabled hinting, the argument */ 1572 /* is ignored. */ 1573 if ( size && ( size->GS.instruct_control & 1 ) ) 1574 loader.load_flags |= FT_LOAD_NO_HINTING; 1575 1576#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1577 1578 /* Main loading loop */ 1579 glyph->format = ft_glyph_format_outline; 1580 glyph->num_subglyphs = 0; 1581 error = load_truetype_glyph( &loader, glyph_index ); 1582 if ( !error ) 1583 compute_glyph_metrics( &loader, glyph_index ); 1584 1585#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1586 1587 if ( !size || !size->debug ) 1588 TT_Done_Context( loader.exec ); 1589 1590#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1591 1592 Exit: 1593 return error; 1594 } 1595 1596 1597/* END */ 1598