1 /***************************************************************************/ 2 /* */ 3 /* ttgload.c */ 4 /* */ 5 /* TrueType Glyph Loader (body). */ 6 /* */ 7 /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, */ 8 /* 2010 by */ 9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 10 /* */ 11 /* This file is part of the FreeType project, and may only be used, */ 12 /* modified, and distributed under the terms of the FreeType project */ 13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 14 /* this file you indicate that you have read the license and */ 15 /* understand and accept it fully. */ 16 /* */ 17 /***************************************************************************/ 18 19 20 #include <ft2build.h> 21 #include FT_INTERNAL_DEBUG_H 22 #include FT_INTERNAL_CALC_H 23 #include FT_INTERNAL_STREAM_H 24 #include FT_INTERNAL_SFNT_H 25 #include FT_TRUETYPE_TAGS_H 26 #include FT_OUTLINE_H 27 28 #include "ttgload.h" 29 #include "ttpload.h" 30 31 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 32 #include "ttgxvar.h" 33 #endif 34 35 #include "tterrors.h" 36 37 38 /*************************************************************************/ 39 /* */ 40 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 41 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 42 /* messages during execution. */ 43 /* */ 44 #undef FT_COMPONENT 45 #define FT_COMPONENT trace_ttgload 46 47 48 /*************************************************************************/ 49 /* */ 50 /* Composite font flags. */ 51 /* */ 52 #define ARGS_ARE_WORDS 0x0001 53 #define ARGS_ARE_XY_VALUES 0x0002 54 #define ROUND_XY_TO_GRID 0x0004 55 #define WE_HAVE_A_SCALE 0x0008 56 /* reserved 0x0010 */ 57 #define MORE_COMPONENTS 0x0020 58 #define WE_HAVE_AN_XY_SCALE 0x0040 59 #define WE_HAVE_A_2X2 0x0080 60 #define WE_HAVE_INSTR 0x0100 61 #define USE_MY_METRICS 0x0200 62 #define OVERLAP_COMPOUND 0x0400 63 #define SCALED_COMPONENT_OFFSET 0x0800 64 #define UNSCALED_COMPONENT_OFFSET 0x1000 65 66 67 /*************************************************************************/ 68 /* */ 69 /* Returns the horizontal metrics in font units for a given glyph. If */ 70 /* `check' is true, take care of monospaced fonts by returning the */ 71 /* advance width maximum. */ 72 /* */ 73 FT_LOCAL_DEF( void ) 74 TT_Get_HMetrics( TT_Face face, 75 FT_UInt idx, 76 FT_Bool check, 77 FT_Short* lsb, 78 FT_UShort* aw ) 79 { 80 ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw ); 81 82 if ( check && face->postscript.isFixedPitch ) 83 *aw = face->horizontal.advance_Width_Max; 84 85 FT_TRACE5(( " advance width (font units): %d\n", *aw )); 86 FT_TRACE5(( " left side bearing (font units): %d\n", *lsb )); 87 } 88 89 90 /*************************************************************************/ 91 /* */ 92 /* Returns the vertical metrics in font units for a given glyph. */ 93 /* Greg Hitchcock from Microsoft told us that if there were no `vmtx' */ 94 /* table, typoAscender/Descender from the `OS/2' table would be used */ 95 /* instead, and if there were no `OS/2' table, use ascender/descender */ 96 /* from the `hhea' table. But that is not what Microsoft's rasterizer */ 97 /* apparently does: It uses the ppem value as the advance height, and */ 98 /* sets the top side bearing to be zero. */ 99 /* */ 100 /* The monospace `check' is probably not meaningful here, but we leave */ 101 /* it in for a consistent interface. */ 102 /* */ 103 FT_LOCAL_DEF( void ) 104 TT_Get_VMetrics( TT_Face face, 105 FT_UInt idx, 106 FT_Bool check, 107 FT_Short* tsb, 108 FT_UShort* ah ) 109 { 110 FT_UNUSED( check ); 111 112 if ( face->vertical_info ) 113 ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah ); 114 115 #if 1 /* Empirically determined, at variance with what MS said */ 116 117 else 118 { 119 *tsb = 0; 120 *ah = face->root.units_per_EM; 121 } 122 123 #else /* This is what MS said to do. It isn't what they do, however. */ 124 125 else if ( face->os2.version != 0xFFFFU ) 126 { 127 *tsb = face->os2.sTypoAscender; 128 *ah = face->os2.sTypoAscender - face->os2.sTypoDescender; 129 } 130 else 131 { 132 *tsb = face->horizontal.Ascender; 133 *ah = face->horizontal.Ascender - face->horizontal.Descender; 134 } 135 136 #endif 137 138 FT_TRACE5(( " advance height (font units): %d\n", *ah )); 139 FT_TRACE5(( " top side bearing (font units): %d\n", *tsb )); 140 } 141 142 143 static void 144 tt_get_metrics( TT_Loader loader, 145 FT_UInt glyph_index ) 146 { 147 TT_Face face = (TT_Face)loader->face; 148 149 FT_Short left_bearing = 0, top_bearing = 0; 150 FT_UShort advance_width = 0, advance_height = 0; 151 152 153 TT_Get_HMetrics( face, glyph_index, 154 (FT_Bool)!( loader->load_flags & 155 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), 156 &left_bearing, 157 &advance_width ); 158 TT_Get_VMetrics( face, glyph_index, 159 (FT_Bool)!( loader->load_flags & 160 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), 161 &top_bearing, 162 &advance_height ); 163 164 loader->left_bearing = left_bearing; 165 loader->advance = advance_width; 166 loader->top_bearing = top_bearing; 167 loader->vadvance = advance_height; 168 169 if ( !loader->linear_def ) 170 { 171 loader->linear_def = 1; 172 loader->linear = advance_width; 173 } 174 } 175 176 177 #ifdef FT_CONFIG_OPTION_INCREMENTAL 178 179 static void 180 tt_get_metrics_incr_overrides( TT_Loader loader, 181 FT_UInt glyph_index ) 182 { 183 TT_Face face = (TT_Face)loader->face; 184 185 FT_Short left_bearing = 0, top_bearing = 0; 186 FT_UShort advance_width = 0, advance_height = 0; 187 188 189 /* If this is an incrementally loaded font check whether there are */ 190 /* overriding metrics for this glyph. */ 191 if ( face->root.internal->incremental_interface && 192 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 193 { 194 FT_Incremental_MetricsRec metrics; 195 FT_Error error; 196 197 198 metrics.bearing_x = loader->left_bearing; 199 metrics.bearing_y = 0; 200 metrics.advance = loader->advance; 201 metrics.advance_v = 0; 202 203 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 204 face->root.internal->incremental_interface->object, 205 glyph_index, FALSE, &metrics ); 206 if ( error ) 207 goto Exit; 208 209 left_bearing = (FT_Short)metrics.bearing_x; 210 advance_width = (FT_UShort)metrics.advance; 211 212 #if 0 213 214 /* GWW: Do I do the same for vertical metrics? */ 215 metrics.bearing_x = 0; 216 metrics.bearing_y = loader->top_bearing; 217 metrics.advance = loader->vadvance; 218 219 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 220 face->root.internal->incremental_interface->object, 221 glyph_index, TRUE, &metrics ); 222 if ( error ) 223 goto Exit; 224 225 top_bearing = (FT_Short)metrics.bearing_y; 226 advance_height = (FT_UShort)metrics.advance; 227 228 #endif /* 0 */ 229 230 loader->left_bearing = left_bearing; 231 loader->advance = advance_width; 232 loader->top_bearing = top_bearing; 233 loader->vadvance = advance_height; 234 235 if ( !loader->linear_def ) 236 { 237 loader->linear_def = 1; 238 loader->linear = advance_width; 239 } 240 } 241 242 Exit: 243 return; 244 } 245 246 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 247 248 249 /*************************************************************************/ 250 /* */ 251 /* Translates an array of coordinates. */ 252 /* */ 253 static void 254 translate_array( FT_UInt n, 255 FT_Vector* coords, 256 FT_Pos delta_x, 257 FT_Pos delta_y ) 258 { 259 FT_UInt k; 260 261 262 if ( delta_x ) 263 for ( k = 0; k < n; k++ ) 264 coords[k].x += delta_x; 265 266 if ( delta_y ) 267 for ( k = 0; k < n; k++ ) 268 coords[k].y += delta_y; 269 } 270 271 272 #undef IS_HINTED 273 #define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 ) 274 275 276 /*************************************************************************/ 277 /* */ 278 /* The following functions are used by default with TrueType fonts. */ 279 /* However, they can be replaced by alternatives if we need to support */ 280 /* TrueType-compressed formats (like MicroType) in the future. */ 281 /* */ 282 /*************************************************************************/ 283 284 FT_CALLBACK_DEF( FT_Error ) 285 TT_Access_Glyph_Frame( TT_Loader loader, 286 FT_UInt glyph_index, 287 FT_ULong offset, 288 FT_UInt byte_count ) 289 { 290 FT_Error error; 291 FT_Stream stream = loader->stream; 292 293 /* for non-debug mode */ 294 FT_UNUSED( glyph_index ); 295 296 297 FT_TRACE4(( "Glyph %ld\n", glyph_index )); 298 299 /* the following line sets the `error' variable through macros! */ 300 if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) ) 301 return error; 302 303 loader->cursor = stream->cursor; 304 loader->limit = stream->limit; 305 306 return TT_Err_Ok; 307 } 308 309 310 FT_CALLBACK_DEF( void ) 311 TT_Forget_Glyph_Frame( TT_Loader loader ) 312 { 313 FT_Stream stream = loader->stream; 314 315 316 FT_FRAME_EXIT(); 317 } 318 319 320 FT_CALLBACK_DEF( FT_Error ) 321 TT_Load_Glyph_Header( TT_Loader loader ) 322 { 323 FT_Byte* p = loader->cursor; 324 FT_Byte* limit = loader->limit; 325 326 327 if ( p + 10 > limit ) 328 return TT_Err_Invalid_Outline; 329 330 loader->n_contours = FT_NEXT_SHORT( p ); 331 332 loader->bbox.xMin = FT_NEXT_SHORT( p ); 333 loader->bbox.yMin = FT_NEXT_SHORT( p ); 334 loader->bbox.xMax = FT_NEXT_SHORT( p ); 335 loader->bbox.yMax = FT_NEXT_SHORT( p ); 336 337 FT_TRACE5(( " # of contours: %d\n", loader->n_contours )); 338 FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin, 339 loader->bbox.xMax )); 340 FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin, 341 loader->bbox.yMax )); 342 loader->cursor = p; 343 344 return TT_Err_Ok; 345 } 346 347 348 FT_CALLBACK_DEF( FT_Error ) 349 TT_Load_Simple_Glyph( TT_Loader load ) 350 { 351 FT_Error error; 352 FT_Byte* p = load->cursor; 353 FT_Byte* limit = load->limit; 354 FT_GlyphLoader gloader = load->gloader; 355 FT_Int n_contours = load->n_contours; 356 FT_Outline* outline; 357 TT_Face face = (TT_Face)load->face; 358 FT_UShort n_ins; 359 FT_Int n_points; 360 361 FT_Byte *flag, *flag_limit; 362 FT_Byte c, count; 363 FT_Vector *vec, *vec_limit; 364 FT_Pos x; 365 FT_Short *cont, *cont_limit, prev_cont; 366 FT_Int xy_size = 0; 367 368 369 /* check that we can add the contours to the glyph */ 370 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours ); 371 if ( error ) 372 goto Fail; 373 374 /* reading the contours' endpoints & number of points */ 375 cont = gloader->current.outline.contours; 376 cont_limit = cont + n_contours; 377 378 /* check space for contours array + instructions count */ 379 if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit ) 380 goto Invalid_Outline; 381 382 prev_cont = FT_NEXT_USHORT( p ); 383 384 if ( n_contours > 0 ) 385 cont[0] = prev_cont; 386 387 for ( cont++; cont < cont_limit; cont++ ) 388 { 389 cont[0] = FT_NEXT_USHORT( p ); 390 if ( cont[0] <= prev_cont ) 391 { 392 /* unordered contours: this is invalid */ 393 error = TT_Err_Invalid_Table; 394 goto Fail; 395 } 396 prev_cont = cont[0]; 397 } 398 399 n_points = 0; 400 if ( n_contours > 0 ) 401 { 402 n_points = cont[-1] + 1; 403 if ( n_points < 0 ) 404 goto Invalid_Outline; 405 } 406 407 /* note that we will add four phantom points later */ 408 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 ); 409 if ( error ) 410 goto Fail; 411 412 /* we'd better check the contours table right now */ 413 outline = &gloader->current.outline; 414 415 for ( cont = outline->contours + 1; cont < cont_limit; cont++ ) 416 if ( cont[-1] >= cont[0] ) 417 goto Invalid_Outline; 418 419 /* reading the bytecode instructions */ 420 load->glyph->control_len = 0; 421 load->glyph->control_data = 0; 422 423 if ( p + 2 > limit ) 424 goto Invalid_Outline; 425 426 n_ins = FT_NEXT_USHORT( p ); 427 428 FT_TRACE5(( " Instructions size: %u\n", n_ins )); 429 430 if ( n_ins > face->max_profile.maxSizeOfInstructions ) 431 { 432 FT_TRACE0(( "TT_Load_Simple_Glyph: too many instructions (%d)\n", 433 n_ins )); 434 error = TT_Err_Too_Many_Hints; 435 goto Fail; 436 } 437 438 if ( ( limit - p ) < n_ins ) 439 { 440 FT_TRACE0(( "TT_Load_Simple_Glyph: instruction count mismatch\n" )); 441 error = TT_Err_Too_Many_Hints; 442 goto Fail; 443 } 444 445 #ifdef TT_USE_BYTECODE_INTERPRETER 446 447 if ( IS_HINTED( load->load_flags ) ) 448 { 449 load->glyph->control_len = n_ins; 450 load->glyph->control_data = load->exec->glyphIns; 451 452 FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins ); 453 } 454 455 #endif /* TT_USE_BYTECODE_INTERPRETER */ 456 457 p += n_ins; 458 459 /* reading the point tags */ 460 flag = (FT_Byte*)outline->tags; 461 flag_limit = flag + n_points; 462 463 FT_ASSERT( flag != NULL ); 464 465 while ( flag < flag_limit ) 466 { 467 if ( p + 1 > limit ) 468 goto Invalid_Outline; 469 470 *flag++ = c = FT_NEXT_BYTE( p ); 471 if ( c & 8 ) 472 { 473 if ( p + 1 > limit ) 474 goto Invalid_Outline; 475 476 count = FT_NEXT_BYTE( p ); 477 if ( flag + (FT_Int)count > flag_limit ) 478 goto Invalid_Outline; 479 480 for ( ; count > 0; count-- ) 481 *flag++ = c; 482 } 483 } 484 485 /* reading the X coordinates */ 486 487 vec = outline->points; 488 vec_limit = vec + n_points; 489 flag = (FT_Byte*)outline->tags; 490 x = 0; 491 492 if ( p + xy_size > limit ) 493 goto Invalid_Outline; 494 495 for ( ; vec < vec_limit; vec++, flag++ ) 496 { 497 FT_Pos y = 0; 498 FT_Byte f = *flag; 499 500 501 if ( f & 2 ) 502 { 503 if ( p + 1 > limit ) 504 goto Invalid_Outline; 505 506 y = (FT_Pos)FT_NEXT_BYTE( p ); 507 if ( ( f & 16 ) == 0 ) 508 y = -y; 509 } 510 else if ( ( f & 16 ) == 0 ) 511 { 512 if ( p + 2 > limit ) 513 goto Invalid_Outline; 514 515 y = (FT_Pos)FT_NEXT_SHORT( p ); 516 } 517 518 x += y; 519 vec->x = x; 520 /* the cast is for stupid compilers */ 521 *flag = (FT_Byte)( f & ~( 2 | 16 ) ); 522 } 523 524 /* reading the Y coordinates */ 525 526 vec = gloader->current.outline.points; 527 vec_limit = vec + n_points; 528 flag = (FT_Byte*)outline->tags; 529 x = 0; 530 531 for ( ; vec < vec_limit; vec++, flag++ ) 532 { 533 FT_Pos y = 0; 534 FT_Byte f = *flag; 535 536 537 if ( f & 4 ) 538 { 539 if ( p + 1 > limit ) 540 goto Invalid_Outline; 541 542 y = (FT_Pos)FT_NEXT_BYTE( p ); 543 if ( ( f & 32 ) == 0 ) 544 y = -y; 545 } 546 else if ( ( f & 32 ) == 0 ) 547 { 548 if ( p + 2 > limit ) 549 goto Invalid_Outline; 550 551 y = (FT_Pos)FT_NEXT_SHORT( p ); 552 } 553 554 x += y; 555 vec->y = x; 556 /* the cast is for stupid compilers */ 557 *flag = (FT_Byte)( f & FT_CURVE_TAG_ON ); 558 } 559 560 outline->n_points = (FT_UShort)n_points; 561 outline->n_contours = (FT_Short) n_contours; 562 563 load->cursor = p; 564 565 Fail: 566 return error; 567 568 Invalid_Outline: 569 error = TT_Err_Invalid_Outline; 570 goto Fail; 571 } 572 573 574 FT_CALLBACK_DEF( FT_Error ) 575 TT_Load_Composite_Glyph( TT_Loader loader ) 576 { 577 FT_Error error; 578 FT_Byte* p = loader->cursor; 579 FT_Byte* limit = loader->limit; 580 FT_GlyphLoader gloader = loader->gloader; 581 FT_SubGlyph subglyph; 582 FT_UInt num_subglyphs; 583 584 585 num_subglyphs = 0; 586 587 do 588 { 589 FT_Fixed xx, xy, yy, yx; 590 FT_UInt count; 591 592 593 /* check that we can load a new subglyph */ 594 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 ); 595 if ( error ) 596 goto Fail; 597 598 /* check space */ 599 if ( p + 4 > limit ) 600 goto Invalid_Composite; 601 602 subglyph = gloader->current.subglyphs + num_subglyphs; 603 604 subglyph->arg1 = subglyph->arg2 = 0; 605 606 subglyph->flags = FT_NEXT_USHORT( p ); 607 subglyph->index = FT_NEXT_USHORT( p ); 608 609 /* check space */ 610 count = 2; 611 if ( subglyph->flags & ARGS_ARE_WORDS ) 612 count += 2; 613 if ( subglyph->flags & WE_HAVE_A_SCALE ) 614 count += 2; 615 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 616 count += 4; 617 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 618 count += 8; 619 620 if ( p + count > limit ) 621 goto Invalid_Composite; 622 623 /* read arguments */ 624 if ( subglyph->flags & ARGS_ARE_WORDS ) 625 { 626 subglyph->arg1 = FT_NEXT_SHORT( p ); 627 subglyph->arg2 = FT_NEXT_SHORT( p ); 628 } 629 else 630 { 631 subglyph->arg1 = FT_NEXT_CHAR( p ); 632 subglyph->arg2 = FT_NEXT_CHAR( p ); 633 } 634 635 /* read transform */ 636 xx = yy = 0x10000L; 637 xy = yx = 0; 638 639 if ( subglyph->flags & WE_HAVE_A_SCALE ) 640 { 641 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 642 yy = xx; 643 } 644 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 645 { 646 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 647 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 648 } 649 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 650 { 651 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 652 yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 653 xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 654 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 655 } 656 657 subglyph->transform.xx = xx; 658 subglyph->transform.xy = xy; 659 subglyph->transform.yx = yx; 660 subglyph->transform.yy = yy; 661 662 num_subglyphs++; 663 664 } while ( subglyph->flags & MORE_COMPONENTS ); 665 666 gloader->current.num_subglyphs = num_subglyphs; 667 668 #ifdef TT_USE_BYTECODE_INTERPRETER 669 670 { 671 FT_Stream stream = loader->stream; 672 673 674 /* we must undo the FT_FRAME_ENTER in order to point */ 675 /* to the composite instructions, if we find some. */ 676 /* We will process them later. */ 677 /* */ 678 loader->ins_pos = (FT_ULong)( FT_STREAM_POS() + 679 p - limit ); 680 } 681 682 #endif 683 684 loader->cursor = p; 685 686 Fail: 687 return error; 688 689 Invalid_Composite: 690 error = TT_Err_Invalid_Composite; 691 goto Fail; 692 } 693 694 695 FT_LOCAL_DEF( void ) 696 TT_Init_Glyph_Loading( TT_Face face ) 697 { 698 face->access_glyph_frame = TT_Access_Glyph_Frame; 699 face->read_glyph_header = TT_Load_Glyph_Header; 700 face->read_simple_glyph = TT_Load_Simple_Glyph; 701 face->read_composite_glyph = TT_Load_Composite_Glyph; 702 face->forget_glyph_frame = TT_Forget_Glyph_Frame; 703 } 704 705 706 static void 707 tt_prepare_zone( TT_GlyphZone zone, 708 FT_GlyphLoad load, 709 FT_UInt start_point, 710 FT_UInt start_contour ) 711 { 712 zone->n_points = (FT_UShort)( load->outline.n_points - start_point ); 713 zone->n_contours = (FT_Short) ( load->outline.n_contours - 714 start_contour ); 715 zone->org = load->extra_points + start_point; 716 zone->cur = load->outline.points + start_point; 717 zone->orus = load->extra_points2 + start_point; 718 zone->tags = (FT_Byte*)load->outline.tags + start_point; 719 zone->contours = (FT_UShort*)load->outline.contours + start_contour; 720 zone->first_point = (FT_UShort)start_point; 721 } 722 723 724 /*************************************************************************/ 725 /* */ 726 /* <Function> */ 727 /* TT_Hint_Glyph */ 728 /* */ 729 /* <Description> */ 730 /* Hint the glyph using the zone prepared by the caller. Note that */ 731 /* the zone is supposed to include four phantom points. */ 732 /* */ 733 static FT_Error 734 TT_Hint_Glyph( TT_Loader loader, 735 FT_Bool is_composite ) 736 { 737 TT_GlyphZone zone = &loader->zone; 738 FT_Pos origin; 739 740 #ifdef TT_USE_BYTECODE_INTERPRETER 741 FT_UInt n_ins; 742 #else 743 FT_UNUSED( is_composite ); 744 #endif 745 746 747 #ifdef TT_USE_BYTECODE_INTERPRETER 748 if ( loader->glyph->control_len > 0xFFFFL ) 749 { 750 FT_TRACE1(( "TT_Hint_Glyph: too long instructions " )); 751 FT_TRACE1(( "(0x%lx byte) is truncated\n", 752 loader->glyph->control_len )); 753 } 754 n_ins = (FT_UInt)( loader->glyph->control_len ); 755 #endif 756 757 origin = zone->cur[zone->n_points - 4].x; 758 origin = FT_PIX_ROUND( origin ) - origin; 759 if ( origin ) 760 translate_array( zone->n_points, zone->cur, origin, 0 ); 761 762 #ifdef TT_USE_BYTECODE_INTERPRETER 763 /* save original point position in org */ 764 if ( n_ins > 0 ) 765 FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points ); 766 767 /* Reset graphics state. */ 768 loader->exec->GS = ((TT_Size)loader->size)->GS; 769 770 /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */ 771 /* completely refer to the (already) hinted subglyphs. */ 772 if ( is_composite ) 773 { 774 loader->exec->metrics.x_scale = 1 << 16; 775 loader->exec->metrics.y_scale = 1 << 16; 776 777 FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points ); 778 } 779 else 780 { 781 loader->exec->metrics.x_scale = 782 ((TT_Size)loader->size)->metrics.x_scale; 783 loader->exec->metrics.y_scale = 784 ((TT_Size)loader->size)->metrics.y_scale; 785 } 786 #endif 787 788 /* round pp2 and pp4 */ 789 zone->cur[zone->n_points - 3].x = 790 FT_PIX_ROUND( zone->cur[zone->n_points - 3].x ); 791 zone->cur[zone->n_points - 1].y = 792 FT_PIX_ROUND( zone->cur[zone->n_points - 1].y ); 793 794 #ifdef TT_USE_BYTECODE_INTERPRETER 795 796 if ( n_ins > 0 ) 797 { 798 FT_Bool debug; 799 FT_Error error; 800 801 FT_GlyphLoader gloader = loader->gloader; 802 FT_Outline current_outline = gloader->current.outline; 803 804 805 error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph, 806 loader->exec->glyphIns, n_ins ); 807 if ( error ) 808 return error; 809 810 loader->exec->is_composite = is_composite; 811 loader->exec->pts = *zone; 812 813 debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) && 814 ((TT_Size)loader->size)->debug ); 815 816 error = TT_Run_Context( loader->exec, debug ); 817 if ( error && loader->exec->pedantic_hinting ) 818 return error; 819 820 /* store drop-out mode in bits 5-7; set bit 2 also as a marker */ 821 current_outline.tags[0] |= 822 ( loader->exec->GS.scan_type << 5 ) | FT_CURVE_TAG_HAS_SCANMODE; 823 } 824 825 #endif 826 827 /* save glyph phantom points */ 828 if ( !loader->preserve_pps ) 829 { 830 loader->pp1 = zone->cur[zone->n_points - 4]; 831 loader->pp2 = zone->cur[zone->n_points - 3]; 832 loader->pp3 = zone->cur[zone->n_points - 2]; 833 loader->pp4 = zone->cur[zone->n_points - 1]; 834 } 835 836 return TT_Err_Ok; 837 } 838 839 840 /*************************************************************************/ 841 /* */ 842 /* <Function> */ 843 /* TT_Process_Simple_Glyph */ 844 /* */ 845 /* <Description> */ 846 /* Once a simple glyph has been loaded, it needs to be processed. */ 847 /* Usually, this means scaling and hinting through bytecode */ 848 /* interpretation. */ 849 /* */ 850 static FT_Error 851 TT_Process_Simple_Glyph( TT_Loader loader ) 852 { 853 FT_GlyphLoader gloader = loader->gloader; 854 FT_Error error = TT_Err_Ok; 855 FT_Outline* outline; 856 FT_Int n_points; 857 858 859 outline = &gloader->current.outline; 860 n_points = outline->n_points; 861 862 /* set phantom points */ 863 864 outline->points[n_points ] = loader->pp1; 865 outline->points[n_points + 1] = loader->pp2; 866 outline->points[n_points + 2] = loader->pp3; 867 outline->points[n_points + 3] = loader->pp4; 868 869 outline->tags[n_points ] = 0; 870 outline->tags[n_points + 1] = 0; 871 outline->tags[n_points + 2] = 0; 872 outline->tags[n_points + 3] = 0; 873 874 n_points += 4; 875 876 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 877 878 if ( ((TT_Face)loader->face)->doblend ) 879 { 880 /* Deltas apply to the unscaled data. */ 881 FT_Vector* deltas; 882 FT_Memory memory = loader->face->memory; 883 FT_Int i; 884 885 886 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), 887 loader->glyph_index, 888 &deltas, 889 n_points ); 890 if ( error ) 891 return error; 892 893 for ( i = 0; i < n_points; ++i ) 894 { 895 outline->points[i].x += deltas[i].x; 896 outline->points[i].y += deltas[i].y; 897 } 898 899 FT_FREE( deltas ); 900 } 901 902 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 903 904 if ( IS_HINTED( loader->load_flags ) ) 905 { 906 tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 ); 907 908 FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur, 909 loader->zone.n_points + 4 ); 910 } 911 912 /* scale the glyph */ 913 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 914 { 915 FT_Vector* vec = outline->points; 916 FT_Vector* limit = outline->points + n_points; 917 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; 918 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; 919 920 921 for ( ; vec < limit; vec++ ) 922 { 923 vec->x = FT_MulFix( vec->x, x_scale ); 924 vec->y = FT_MulFix( vec->y, y_scale ); 925 } 926 927 loader->pp1 = outline->points[n_points - 4]; 928 loader->pp2 = outline->points[n_points - 3]; 929 loader->pp3 = outline->points[n_points - 2]; 930 loader->pp4 = outline->points[n_points - 1]; 931 } 932 933 if ( IS_HINTED( loader->load_flags ) ) 934 { 935 loader->zone.n_points += 4; 936 937 error = TT_Hint_Glyph( loader, 0 ); 938 } 939 940 return error; 941 } 942 943 944 /*************************************************************************/ 945 /* */ 946 /* <Function> */ 947 /* TT_Process_Composite_Component */ 948 /* */ 949 /* <Description> */ 950 /* Once a composite component has been loaded, it needs to be */ 951 /* processed. Usually, this means transforming and translating. */ 952 /* */ 953 static FT_Error 954 TT_Process_Composite_Component( TT_Loader loader, 955 FT_SubGlyph subglyph, 956 FT_UInt start_point, 957 FT_UInt num_base_points ) 958 { 959 FT_GlyphLoader gloader = loader->gloader; 960 FT_Vector* base_vec = gloader->base.outline.points; 961 FT_UInt num_points = gloader->base.outline.n_points; 962 FT_Bool have_scale; 963 FT_Pos x, y; 964 965 966 have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE | 967 WE_HAVE_AN_XY_SCALE | 968 WE_HAVE_A_2X2 ) ); 969 970 /* perform the transform required for this subglyph */ 971 if ( have_scale ) 972 { 973 FT_UInt i; 974 975 976 for ( i = num_base_points; i < num_points; i++ ) 977 FT_Vector_Transform( base_vec + i, &subglyph->transform ); 978 } 979 980 /* get offset */ 981 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) 982 { 983 FT_UInt k = subglyph->arg1; 984 FT_UInt l = subglyph->arg2; 985 FT_Vector* p1; 986 FT_Vector* p2; 987 988 989 /* match l-th point of the newly loaded component to the k-th point */ 990 /* of the previously loaded components. */ 991 992 /* change to the point numbers used by our outline */ 993 k += start_point; 994 l += num_base_points; 995 if ( k >= num_base_points || 996 l >= num_points ) 997 return TT_Err_Invalid_Composite; 998 999 p1 = gloader->base.outline.points + k; 1000 p2 = gloader->base.outline.points + l; 1001 1002 x = p1->x - p2->x; 1003 y = p1->y - p2->y; 1004 } 1005 else 1006 { 1007 x = subglyph->arg1; 1008 y = subglyph->arg2; 1009 1010 if ( !x && !y ) 1011 return TT_Err_Ok; 1012 1013 /* Use a default value dependent on */ 1014 /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */ 1015 /* fonts which don't set the xxx_COMPONENT_OFFSET bit. */ 1016 1017 if ( have_scale && 1018 #ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED 1019 !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) ) 1020 #else 1021 ( subglyph->flags & SCALED_COMPONENT_OFFSET ) ) 1022 #endif 1023 { 1024 1025 #if 0 1026 1027 /*************************************************************************/ 1028 /* */ 1029 /* This algorithm is what Apple documents. But it doesn't work. */ 1030 /* */ 1031 int a = subglyph->transform.xx > 0 ? subglyph->transform.xx 1032 : -subglyph->transform.xx; 1033 int b = subglyph->transform.yx > 0 ? subglyph->transform.yx 1034 : -subglyph->transform.yx; 1035 int c = subglyph->transform.xy > 0 ? subglyph->transform.xy 1036 : -subglyph->transform.xy; 1037 int d = subglyph->transform.yy > 0 ? subglyph->transform.yy 1038 : -subglyph->transform.yy; 1039 int m = a > b ? a : b; 1040 int n = c > d ? c : d; 1041 1042 1043 if ( a - b <= 33 && a - b >= -33 ) 1044 m *= 2; 1045 if ( c - d <= 33 && c - d >= -33 ) 1046 n *= 2; 1047 x = FT_MulFix( x, m ); 1048 y = FT_MulFix( y, n ); 1049 1050 #else /* 0 */ 1051 1052 /*************************************************************************/ 1053 /* */ 1054 /* This algorithm is a guess and works much better than the above. */ 1055 /* */ 1056 FT_Fixed mac_xscale = FT_SqrtFixed( 1057 (FT_Int32)FT_MulFix( subglyph->transform.xx, 1058 subglyph->transform.xx ) + 1059 (FT_Int32)FT_MulFix( subglyph->transform.xy, 1060 subglyph->transform.xy ) ); 1061 FT_Fixed mac_yscale = FT_SqrtFixed( 1062 (FT_Int32)FT_MulFix( subglyph->transform.yy, 1063 subglyph->transform.yy ) + 1064 (FT_Int32)FT_MulFix( subglyph->transform.yx, 1065 subglyph->transform.yx ) ); 1066 1067 1068 x = FT_MulFix( x, mac_xscale ); 1069 y = FT_MulFix( y, mac_yscale ); 1070 1071 #endif /* 0 */ 1072 1073 } 1074 1075 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1076 { 1077 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; 1078 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; 1079 1080 1081 x = FT_MulFix( x, x_scale ); 1082 y = FT_MulFix( y, y_scale ); 1083 1084 if ( subglyph->flags & ROUND_XY_TO_GRID ) 1085 { 1086 x = FT_PIX_ROUND( x ); 1087 y = FT_PIX_ROUND( y ); 1088 } 1089 } 1090 } 1091 1092 if ( x || y ) 1093 translate_array( num_points - num_base_points, 1094 base_vec + num_base_points, 1095 x, y ); 1096 1097 return TT_Err_Ok; 1098 } 1099 1100 1101 /*************************************************************************/ 1102 /* */ 1103 /* <Function> */ 1104 /* TT_Process_Composite_Glyph */ 1105 /* */ 1106 /* <Description> */ 1107 /* This is slightly different from TT_Process_Simple_Glyph, in that */ 1108 /* its sole purpose is to hint the glyph. Thus this function is */ 1109 /* only available when bytecode interpreter is enabled. */ 1110 /* */ 1111 static FT_Error 1112 TT_Process_Composite_Glyph( TT_Loader loader, 1113 FT_UInt start_point, 1114 FT_UInt start_contour ) 1115 { 1116 FT_Error error; 1117 FT_Outline* outline; 1118 FT_UInt i; 1119 1120 1121 outline = &loader->gloader->base.outline; 1122 1123 /* make room for phantom points */ 1124 error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader, 1125 outline->n_points + 4, 1126 0 ); 1127 if ( error ) 1128 return error; 1129 1130 outline->points[outline->n_points ] = loader->pp1; 1131 outline->points[outline->n_points + 1] = loader->pp2; 1132 outline->points[outline->n_points + 2] = loader->pp3; 1133 outline->points[outline->n_points + 3] = loader->pp4; 1134 1135 outline->tags[outline->n_points ] = 0; 1136 outline->tags[outline->n_points + 1] = 0; 1137 outline->tags[outline->n_points + 2] = 0; 1138 outline->tags[outline->n_points + 3] = 0; 1139 1140 #ifdef TT_USE_BYTECODE_INTERPRETER 1141 1142 { 1143 FT_Stream stream = loader->stream; 1144 FT_UShort n_ins, max_ins; 1145 FT_ULong tmp; 1146 1147 1148 /* TT_Load_Composite_Glyph only gives us the offset of instructions */ 1149 /* so we read them here */ 1150 if ( FT_STREAM_SEEK( loader->ins_pos ) || 1151 FT_READ_USHORT( n_ins ) ) 1152 return error; 1153 1154 FT_TRACE5(( " Instructions size = %d\n", n_ins )); 1155 1156 /* check it */ 1157 max_ins = ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions; 1158 if ( n_ins > max_ins ) 1159 { 1160 /* acroread ignores this field, so we only do a rough safety check */ 1161 if ( (FT_Int)n_ins > loader->byte_len ) 1162 { 1163 FT_TRACE1(( "TT_Process_Composite_Glyph: " 1164 "too many instructions (%d) for glyph with length %d\n", 1165 n_ins, loader->byte_len )); 1166 return TT_Err_Too_Many_Hints; 1167 } 1168 1169 tmp = loader->exec->glyphSize; 1170 error = Update_Max( loader->exec->memory, 1171 &tmp, 1172 sizeof ( FT_Byte ), 1173 (void*)&loader->exec->glyphIns, 1174 n_ins ); 1175 loader->exec->glyphSize = (FT_UShort)tmp; 1176 if ( error ) 1177 return error; 1178 } 1179 else if ( n_ins == 0 ) 1180 return TT_Err_Ok; 1181 1182 if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) ) 1183 return error; 1184 1185 loader->glyph->control_data = loader->exec->glyphIns; 1186 loader->glyph->control_len = n_ins; 1187 } 1188 1189 #endif 1190 1191 tt_prepare_zone( &loader->zone, &loader->gloader->base, 1192 start_point, start_contour ); 1193 1194 /* Some points are likely touched during execution of */ 1195 /* instructions on components. So let's untouch them. */ 1196 for ( i = start_point; i < loader->zone.n_points; i++ ) 1197 loader->zone.tags[i] &= ~FT_CURVE_TAG_TOUCH_BOTH; 1198 1199 loader->zone.n_points += 4; 1200 1201 return TT_Hint_Glyph( loader, 1 ); 1202 } 1203 1204 1205 /* Calculate the four phantom points. */ 1206 /* The first two stand for horizontal origin and advance. */ 1207 /* The last two stand for vertical origin and advance. */ 1208 #define TT_LOADER_SET_PP( loader ) \ 1209 do { \ 1210 (loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \ 1211 (loader)->pp1.y = 0; \ 1212 (loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \ 1213 (loader)->pp2.y = 0; \ 1214 (loader)->pp3.x = 0; \ 1215 (loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax; \ 1216 (loader)->pp4.x = 0; \ 1217 (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \ 1218 } while ( 0 ) 1219 1220 1221 /*************************************************************************/ 1222 /* */ 1223 /* <Function> */ 1224 /* load_truetype_glyph */ 1225 /* */ 1226 /* <Description> */ 1227 /* Loads a given truetype glyph. Handles composites and uses a */ 1228 /* TT_Loader object. */ 1229 /* */ 1230 static FT_Error 1231 load_truetype_glyph( TT_Loader loader, 1232 FT_UInt glyph_index, 1233 FT_UInt recurse_count, 1234 FT_Bool header_only ) 1235 { 1236 FT_Error error = TT_Err_Ok; 1237 FT_Fixed x_scale, y_scale; 1238 FT_ULong offset; 1239 TT_Face face = (TT_Face)loader->face; 1240 FT_GlyphLoader gloader = loader->gloader; 1241 FT_Bool opened_frame = 0; 1242 1243 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1244 FT_Vector* deltas = NULL; 1245 #endif 1246 1247 #ifdef FT_CONFIG_OPTION_INCREMENTAL 1248 FT_StreamRec inc_stream; 1249 FT_Data glyph_data; 1250 FT_Bool glyph_data_loaded = 0; 1251 #endif 1252 1253 1254 /* some fonts have an incorrect value of `maxComponentDepth', */ 1255 /* thus we allow depth 1 to catch the majority of them */ 1256 if ( recurse_count > 1 && 1257 recurse_count > face->max_profile.maxComponentDepth ) 1258 { 1259 error = TT_Err_Invalid_Composite; 1260 goto Exit; 1261 } 1262 1263 /* check glyph index */ 1264 if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) 1265 { 1266 error = TT_Err_Invalid_Glyph_Index; 1267 goto Exit; 1268 } 1269 1270 loader->glyph_index = glyph_index; 1271 1272 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1273 { 1274 x_scale = ((TT_Size)loader->size)->metrics.x_scale; 1275 y_scale = ((TT_Size)loader->size)->metrics.y_scale; 1276 } 1277 else 1278 { 1279 x_scale = 0x10000L; 1280 y_scale = 0x10000L; 1281 } 1282 1283 tt_get_metrics( loader, glyph_index ); 1284 1285 /* Set `offset' to the start of the glyph relative to the start of */ 1286 /* the `glyf' table, and `byte_len' to the length of the glyph in */ 1287 /* bytes. */ 1288 1289 #ifdef FT_CONFIG_OPTION_INCREMENTAL 1290 1291 /* If we are loading glyph data via the incremental interface, set */ 1292 /* the loader stream to a memory stream reading the data returned */ 1293 /* by the interface. */ 1294 if ( face->root.internal->incremental_interface ) 1295 { 1296 error = face->root.internal->incremental_interface->funcs->get_glyph_data( 1297 face->root.internal->incremental_interface->object, 1298 glyph_index, &glyph_data ); 1299 if ( error ) 1300 goto Exit; 1301 1302 glyph_data_loaded = 1; 1303 offset = 0; 1304 loader->byte_len = glyph_data.length; 1305 1306 FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) ); 1307 FT_Stream_OpenMemory( &inc_stream, 1308 glyph_data.pointer, glyph_data.length ); 1309 1310 loader->stream = &inc_stream; 1311 } 1312 else 1313 1314 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1315 1316 offset = tt_face_get_location( face, glyph_index, 1317 (FT_UInt*)&loader->byte_len ); 1318 1319 if ( loader->byte_len > 0 ) 1320 { 1321 #ifdef FT_CONFIG_OPTION_INCREMENTAL 1322 /* for the incremental interface, `glyf_offset' is always zero */ 1323 if ( !loader->glyf_offset && 1324 !face->root.internal->incremental_interface ) 1325 #else 1326 if ( !loader->glyf_offset ) 1327 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1328 { 1329 FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" )); 1330 error = TT_Err_Invalid_Table; 1331 goto Exit; 1332 } 1333 1334 error = face->access_glyph_frame( loader, glyph_index, 1335 loader->glyf_offset + offset, 1336 loader->byte_len ); 1337 if ( error ) 1338 goto Exit; 1339 1340 opened_frame = 1; 1341 1342 /* read glyph header first */ 1343 error = face->read_glyph_header( loader ); 1344 if ( error || header_only ) 1345 goto Exit; 1346 } 1347 1348 if ( loader->byte_len == 0 || loader->n_contours == 0 ) 1349 { 1350 loader->bbox.xMin = 0; 1351 loader->bbox.xMax = 0; 1352 loader->bbox.yMin = 0; 1353 loader->bbox.yMax = 0; 1354 1355 if ( header_only ) 1356 goto Exit; 1357 1358 /* must initialize points before (possibly) overriding */ 1359 /* glyph metrics from the incremental interface */ 1360 TT_LOADER_SET_PP( loader ); 1361 1362 #ifdef FT_CONFIG_OPTION_INCREMENTAL 1363 tt_get_metrics_incr_overrides( loader, glyph_index ); 1364 #endif 1365 1366 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1367 1368 if ( ((TT_Face)(loader->face))->doblend ) 1369 { 1370 /* this must be done before scaling */ 1371 FT_Memory memory = loader->face->memory; 1372 1373 1374 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), 1375 glyph_index, &deltas, 4 ); 1376 if ( error ) 1377 goto Exit; 1378 1379 loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y; 1380 loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y; 1381 loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y; 1382 loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y; 1383 1384 FT_FREE( deltas ); 1385 } 1386 1387 #endif 1388 1389 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1390 { 1391 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1392 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1393 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1394 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1395 } 1396 1397 error = TT_Err_Ok; 1398 goto Exit; 1399 } 1400 1401 /* must initialize points before (possibly) overriding */ 1402 /* glyph metrics from the incremental interface */ 1403 TT_LOADER_SET_PP( loader ); 1404 1405 #ifdef FT_CONFIG_OPTION_INCREMENTAL 1406 tt_get_metrics_incr_overrides( loader, glyph_index ); 1407 #endif 1408 1409 /***********************************************************************/ 1410 /***********************************************************************/ 1411 /***********************************************************************/ 1412 1413 /* if it is a simple glyph, load it */ 1414 1415 if ( loader->n_contours > 0 ) 1416 { 1417 error = face->read_simple_glyph( loader ); 1418 if ( error ) 1419 goto Exit; 1420 1421 /* all data have been read */ 1422 face->forget_glyph_frame( loader ); 1423 opened_frame = 0; 1424 1425 error = TT_Process_Simple_Glyph( loader ); 1426 if ( error ) 1427 goto Exit; 1428 1429 FT_GlyphLoader_Add( gloader ); 1430 } 1431 1432 /***********************************************************************/ 1433 /***********************************************************************/ 1434 /***********************************************************************/ 1435 1436 /* otherwise, load a composite! */ 1437 else if ( loader->n_contours == -1 ) 1438 { 1439 FT_UInt start_point; 1440 FT_UInt start_contour; 1441 FT_ULong ins_pos; /* position of composite instructions, if any */ 1442 1443 1444 start_point = gloader->base.outline.n_points; 1445 start_contour = gloader->base.outline.n_contours; 1446 1447 /* for each subglyph, read composite header */ 1448 error = face->read_composite_glyph( loader ); 1449 if ( error ) 1450 goto Exit; 1451 1452 /* store the offset of instructions */ 1453 ins_pos = loader->ins_pos; 1454 1455 /* all data we need are read */ 1456 face->forget_glyph_frame( loader ); 1457 opened_frame = 0; 1458 1459 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1460 1461 if ( face->doblend ) 1462 { 1463 FT_Int i, limit; 1464 FT_SubGlyph subglyph; 1465 FT_Memory memory = face->root.memory; 1466 1467 1468 /* this provides additional offsets */ 1469 /* for each component's translation */ 1470 1471 if ( ( error = TT_Vary_Get_Glyph_Deltas( 1472 face, 1473 glyph_index, 1474 &deltas, 1475 gloader->current.num_subglyphs + 4 )) != 0 ) 1476 goto Exit; 1477 1478 subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs; 1479 limit = gloader->current.num_subglyphs; 1480 1481 for ( i = 0; i < limit; ++i, ++subglyph ) 1482 { 1483 if ( subglyph->flags & ARGS_ARE_XY_VALUES ) 1484 { 1485 /* XXX: overflow check for subglyph->{arg1,arg2}. */ 1486 /* deltas[i].{x,y} must be within signed 16-bit, */ 1487 /* but the restriction of summed delta is not clear */ 1488 subglyph->arg1 += (FT_Int16)deltas[i].x; 1489 subglyph->arg2 += (FT_Int16)deltas[i].y; 1490 } 1491 } 1492 1493 loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y; 1494 loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y; 1495 loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y; 1496 loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y; 1497 1498 FT_FREE( deltas ); 1499 } 1500 1501 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 1502 1503 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1504 { 1505 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1506 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1507 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1508 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1509 } 1510 1511 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ 1512 /* `as is' in the glyph slot (the client application will be */ 1513 /* responsible for interpreting these data)... */ 1514 if ( loader->load_flags & FT_LOAD_NO_RECURSE ) 1515 { 1516 FT_GlyphLoader_Add( gloader ); 1517 loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE; 1518 1519 goto Exit; 1520 } 1521 1522 /*********************************************************************/ 1523 /*********************************************************************/ 1524 /*********************************************************************/ 1525 1526 { 1527 FT_UInt n, num_base_points; 1528 FT_SubGlyph subglyph = 0; 1529 1530 FT_UInt num_points = start_point; 1531 FT_UInt num_subglyphs = gloader->current.num_subglyphs; 1532 FT_UInt num_base_subgs = gloader->base.num_subglyphs; 1533 1534 FT_Stream old_stream = loader->stream; 1535 FT_Int old_byte_len = loader->byte_len; 1536 1537 1538 FT_GlyphLoader_Add( gloader ); 1539 1540 /* read each subglyph independently */ 1541 for ( n = 0; n < num_subglyphs; n++ ) 1542 { 1543 FT_Vector pp[4]; 1544 1545 1546 /* Each time we call load_truetype_glyph in this loop, the */ 1547 /* value of `gloader.base.subglyphs' can change due to table */ 1548 /* reallocations. We thus need to recompute the subglyph */ 1549 /* pointer on each iteration. */ 1550 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1551 1552 pp[0] = loader->pp1; 1553 pp[1] = loader->pp2; 1554 pp[2] = loader->pp3; 1555 pp[3] = loader->pp4; 1556 1557 num_base_points = gloader->base.outline.n_points; 1558 1559 error = load_truetype_glyph( loader, subglyph->index, 1560 recurse_count + 1, FALSE ); 1561 if ( error ) 1562 goto Exit; 1563 1564 /* restore subglyph pointer */ 1565 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1566 1567 if ( !( subglyph->flags & USE_MY_METRICS ) ) 1568 { 1569 loader->pp1 = pp[0]; 1570 loader->pp2 = pp[1]; 1571 loader->pp3 = pp[2]; 1572 loader->pp4 = pp[3]; 1573 } 1574 1575 num_points = gloader->base.outline.n_points; 1576 1577 if ( num_points == num_base_points ) 1578 continue; 1579 1580 /* gloader->base.outline consists of three parts: */ 1581 /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */ 1582 /* */ 1583 /* (1): exists from the beginning */ 1584 /* (2): components that have been loaded so far */ 1585 /* (3): the newly loaded component */ 1586 TT_Process_Composite_Component( loader, subglyph, start_point, 1587 num_base_points ); 1588 } 1589 1590 loader->stream = old_stream; 1591 loader->byte_len = old_byte_len; 1592 1593 /* process the glyph */ 1594 loader->ins_pos = ins_pos; 1595 if ( IS_HINTED( loader->load_flags ) && 1596 1597 #ifdef TT_USE_BYTECODE_INTERPRETER 1598 1599 subglyph->flags & WE_HAVE_INSTR && 1600 1601 #endif 1602 1603 num_points > start_point ) 1604 TT_Process_Composite_Glyph( loader, start_point, start_contour ); 1605 1606 } 1607 } 1608 else 1609 { 1610 /* invalid composite count (negative but not -1) */ 1611 error = TT_Err_Invalid_Outline; 1612 goto Exit; 1613 } 1614 1615 /***********************************************************************/ 1616 /***********************************************************************/ 1617 /***********************************************************************/ 1618 1619 Exit: 1620 1621 if ( opened_frame ) 1622 face->forget_glyph_frame( loader ); 1623 1624 #ifdef FT_CONFIG_OPTION_INCREMENTAL 1625 1626 if ( glyph_data_loaded ) 1627 face->root.internal->incremental_interface->funcs->free_glyph_data( 1628 face->root.internal->incremental_interface->object, 1629 &glyph_data ); 1630 1631 #endif 1632 1633 return error; 1634 } 1635 1636 1637 static FT_Error 1638 compute_glyph_metrics( TT_Loader loader, 1639 FT_UInt glyph_index ) 1640 { 1641 FT_BBox bbox; 1642 TT_Face face = (TT_Face)loader->face; 1643 FT_Fixed y_scale; 1644 TT_GlyphSlot glyph = loader->glyph; 1645 TT_Size size = (TT_Size)loader->size; 1646 1647 1648 y_scale = 0x10000L; 1649 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1650 y_scale = size->root.metrics.y_scale; 1651 1652 if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE ) 1653 FT_Outline_Get_CBox( &glyph->outline, &bbox ); 1654 else 1655 bbox = loader->bbox; 1656 1657 /* get the device-independent horizontal advance; it is scaled later */ 1658 /* by the base layer. */ 1659 { 1660 FT_Pos advance = loader->linear; 1661 1662 1663 /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */ 1664 /* correctly support DynaLab fonts, which have an incorrect */ 1665 /* `advance_Width_Max' field! It is used, to my knowledge, */ 1666 /* exclusively in the X-TrueType font server. */ 1667 /* */ 1668 if ( face->postscript.isFixedPitch && 1669 ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 ) 1670 advance = face->horizontal.advance_Width_Max; 1671 1672 /* we need to return the advance in font units in linearHoriAdvance, */ 1673 /* it will be scaled later by the base layer. */ 1674 glyph->linearHoriAdvance = advance; 1675 } 1676 1677 glyph->metrics.horiBearingX = bbox.xMin; 1678 glyph->metrics.horiBearingY = bbox.yMax; 1679 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; 1680 1681 /* adjust advance width to the value contained in the hdmx table */ 1682 if ( !face->postscript.isFixedPitch && 1683 IS_HINTED( loader->load_flags ) ) 1684 { 1685 FT_Byte* widthp; 1686 1687 1688 widthp = tt_face_get_device_metrics( face, 1689 size->root.metrics.x_ppem, 1690 glyph_index ); 1691 1692 if ( widthp ) 1693 glyph->metrics.horiAdvance = *widthp << 6; 1694 } 1695 1696 /* set glyph dimensions */ 1697 glyph->metrics.width = bbox.xMax - bbox.xMin; 1698 glyph->metrics.height = bbox.yMax - bbox.yMin; 1699 1700 /* Now take care of vertical metrics. In the case where there is */ 1701 /* no vertical information within the font (relatively common), */ 1702 /* create some metrics manually */ 1703 { 1704 FT_Pos top; /* scaled vertical top side bearing */ 1705 FT_Pos advance; /* scaled vertical advance height */ 1706 1707 1708 /* Get the unscaled top bearing and advance height. */ 1709 if ( face->vertical_info && 1710 face->vertical.number_Of_VMetrics > 0 ) 1711 { 1712 top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax, 1713 y_scale ); 1714 1715 if ( loader->pp3.y <= loader->pp4.y ) 1716 advance = 0; 1717 else 1718 advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y, 1719 y_scale ); 1720 } 1721 else 1722 { 1723 FT_Pos height; 1724 1725 1726 /* XXX Compute top side bearing and advance height in */ 1727 /* Get_VMetrics instead of here. */ 1728 1729 /* NOTE: The OS/2 values are the only `portable' ones, */ 1730 /* which is why we use them, if there is an OS/2 */ 1731 /* table in the font. Otherwise, we use the */ 1732 /* values defined in the horizontal header. */ 1733 1734 height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin, 1735 y_scale ); 1736 if ( face->os2.version != 0xFFFFU ) 1737 advance = (FT_Pos)( face->os2.sTypoAscender - 1738 face->os2.sTypoDescender ); 1739 else 1740 advance = (FT_Pos)( face->horizontal.Ascender - 1741 face->horizontal.Descender ); 1742 1743 top = ( advance - height ) / 2; 1744 } 1745 1746 #ifdef FT_CONFIG_OPTION_INCREMENTAL 1747 { 1748 FT_Incremental_InterfaceRec* incr; 1749 FT_Incremental_MetricsRec metrics; 1750 FT_Error error; 1751 1752 1753 incr = face->root.internal->incremental_interface; 1754 1755 /* If this is an incrementally loaded font see if there are */ 1756 /* overriding metrics for this glyph. */ 1757 if ( incr && incr->funcs->get_glyph_metrics ) 1758 { 1759 metrics.bearing_x = 0; 1760 metrics.bearing_y = top; 1761 metrics.advance = advance; 1762 1763 error = incr->funcs->get_glyph_metrics( incr->object, 1764 glyph_index, 1765 TRUE, 1766 &metrics ); 1767 if ( error ) 1768 return error; 1769 1770 top = metrics.bearing_y; 1771 advance = metrics.advance; 1772 } 1773 } 1774 1775 /* GWW: Do vertical metrics get loaded incrementally too? */ 1776 1777 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1778 1779 glyph->linearVertAdvance = advance; 1780 1781 /* scale the metrics */ 1782 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1783 { 1784 top = FT_MulFix( top, y_scale ); 1785 advance = FT_MulFix( advance, y_scale ); 1786 } 1787 1788 /* XXX: for now, we have no better algorithm for the lsb, but it */ 1789 /* should work fine. */ 1790 /* */ 1791 glyph->metrics.vertBearingX = glyph->metrics.horiBearingX - 1792 glyph->metrics.horiAdvance / 2; 1793 glyph->metrics.vertBearingY = top; 1794 glyph->metrics.vertAdvance = advance; 1795 } 1796 1797 return 0; 1798 } 1799 1800 1801 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1802 1803 static FT_Error 1804 load_sbit_image( TT_Size size, 1805 TT_GlyphSlot glyph, 1806 FT_UInt glyph_index, 1807 FT_Int32 load_flags ) 1808 { 1809 TT_Face face; 1810 SFNT_Service sfnt; 1811 FT_Stream stream; 1812 FT_Error error; 1813 TT_SBit_MetricsRec metrics; 1814 1815 1816 face = (TT_Face)glyph->face; 1817 sfnt = (SFNT_Service)face->sfnt; 1818 stream = face->root.stream; 1819 1820 error = sfnt->load_sbit_image( face, 1821 size->strike_index, 1822 glyph_index, 1823 (FT_Int)load_flags, 1824 stream, 1825 &glyph->bitmap, 1826 &metrics ); 1827 if ( !error ) 1828 { 1829 glyph->outline.n_points = 0; 1830 glyph->outline.n_contours = 0; 1831 1832 glyph->metrics.width = (FT_Pos)metrics.width << 6; 1833 glyph->metrics.height = (FT_Pos)metrics.height << 6; 1834 1835 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 1836 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 1837 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 1838 1839 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 1840 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 1841 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 1842 1843 glyph->format = FT_GLYPH_FORMAT_BITMAP; 1844 1845 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 1846 { 1847 glyph->bitmap_left = metrics.vertBearingX; 1848 glyph->bitmap_top = metrics.vertBearingY; 1849 } 1850 else 1851 { 1852 glyph->bitmap_left = metrics.horiBearingX; 1853 glyph->bitmap_top = metrics.horiBearingY; 1854 } 1855 } 1856 1857 return error; 1858 } 1859 1860 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 1861 1862 1863 static FT_Error 1864 tt_loader_init( TT_Loader loader, 1865 TT_Size size, 1866 TT_GlyphSlot glyph, 1867 FT_Int32 load_flags, 1868 FT_Bool glyf_table_only ) 1869 { 1870 TT_Face face; 1871 FT_Stream stream; 1872 1873 1874 face = (TT_Face)glyph->face; 1875 stream = face->root.stream; 1876 1877 FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) ); 1878 1879 #ifdef TT_USE_BYTECODE_INTERPRETER 1880 1881 /* load execution context */ 1882 if ( IS_HINTED( load_flags ) && !glyf_table_only ) 1883 { 1884 TT_ExecContext exec; 1885 FT_Bool grayscale; 1886 1887 1888 if ( !size->cvt_ready ) 1889 { 1890 FT_Error error = tt_size_ready_bytecode( size ); 1891 if ( error ) 1892 return error; 1893 } 1894 1895 /* query new execution context */ 1896 exec = size->debug ? size->context 1897 : ( (TT_Driver)FT_FACE_DRIVER( face ) )->context; 1898 if ( !exec ) 1899 return TT_Err_Could_Not_Find_Context; 1900 1901 grayscale = 1902 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO ); 1903 1904 TT_Load_Context( exec, face, size ); 1905 1906 /* a change from mono to grayscale rendering (and vice versa) */ 1907 /* requires a re-execution of the CVT program */ 1908 if ( grayscale != exec->grayscale ) 1909 { 1910 FT_UInt i; 1911 1912 1913 exec->grayscale = grayscale; 1914 1915 for ( i = 0; i < size->cvt_size; i++ ) 1916 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); 1917 tt_size_run_prep( size ); 1918 } 1919 1920 /* see whether the cvt program has disabled hinting */ 1921 if ( exec->GS.instruct_control & 1 ) 1922 load_flags |= FT_LOAD_NO_HINTING; 1923 1924 /* load default graphics state -- if needed */ 1925 if ( exec->GS.instruct_control & 2 ) 1926 exec->GS = tt_default_graphics_state; 1927 1928 exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); 1929 loader->exec = exec; 1930 loader->instructions = exec->glyphIns; 1931 } 1932 1933 #endif /* TT_USE_BYTECODE_INTERPRETER */ 1934 1935 /* seek to the beginning of the glyph table -- for Type 42 fonts */ 1936 /* the table might be accessed from a Postscript stream or something */ 1937 /* else... */ 1938 1939 #ifdef FT_CONFIG_OPTION_INCREMENTAL 1940 1941 if ( face->root.internal->incremental_interface ) 1942 loader->glyf_offset = 0; 1943 else 1944 1945 #endif 1946 1947 { 1948 FT_Error error = face->goto_table( face, TTAG_glyf, stream, 0 ); 1949 1950 1951 if ( error == TT_Err_Table_Missing ) 1952 loader->glyf_offset = 0; 1953 else if ( error ) 1954 { 1955 FT_ERROR(( "tt_loader_init: could not access glyph table\n" )); 1956 return error; 1957 } 1958 else 1959 loader->glyf_offset = FT_STREAM_POS(); 1960 } 1961 1962 /* get face's glyph loader */ 1963 if ( !glyf_table_only ) 1964 { 1965 FT_GlyphLoader gloader = glyph->internal->loader; 1966 1967 1968 FT_GlyphLoader_Rewind( gloader ); 1969 loader->gloader = gloader; 1970 } 1971 1972 loader->load_flags = load_flags; 1973 1974 loader->face = (FT_Face)face; 1975 loader->size = (FT_Size)size; 1976 loader->glyph = (FT_GlyphSlot)glyph; 1977 loader->stream = stream; 1978 1979 return TT_Err_Ok; 1980 } 1981 1982 1983 /*************************************************************************/ 1984 /* */ 1985 /* <Function> */ 1986 /* TT_Load_Glyph */ 1987 /* */ 1988 /* <Description> */ 1989 /* A function used to load a single glyph within a given glyph slot, */ 1990 /* for a given size. */ 1991 /* */ 1992 /* <Input> */ 1993 /* glyph :: A handle to a target slot object where the glyph */ 1994 /* will be loaded. */ 1995 /* */ 1996 /* size :: A handle to the source face size at which the glyph */ 1997 /* must be scaled/loaded. */ 1998 /* */ 1999 /* glyph_index :: The index of the glyph in the font file. */ 2000 /* */ 2001 /* load_flags :: A flag indicating what to load for this glyph. The */ 2002 /* FT_LOAD_XXX constants can be used to control the */ 2003 /* glyph loading process (e.g., whether the outline */ 2004 /* should be scaled, whether to load bitmaps or not, */ 2005 /* whether to hint the outline, etc). */ 2006 /* */ 2007 /* <Return> */ 2008 /* FreeType error code. 0 means success. */ 2009 /* */ 2010 FT_LOCAL_DEF( FT_Error ) 2011 TT_Load_Glyph( TT_Size size, 2012 TT_GlyphSlot glyph, 2013 FT_UInt glyph_index, 2014 FT_Int32 load_flags ) 2015 { 2016 TT_Face face; 2017 FT_Error error; 2018 TT_LoaderRec loader; 2019 2020 2021 face = (TT_Face)glyph->face; 2022 error = TT_Err_Ok; 2023 2024 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 2025 2026 /* try to load embedded bitmap if any */ 2027 /* */ 2028 /* XXX: The convention should be emphasized in */ 2029 /* the documents because it can be confusing. */ 2030 if ( size->strike_index != 0xFFFFFFFFUL && 2031 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 2032 { 2033 error = load_sbit_image( size, glyph, glyph_index, load_flags ); 2034 if ( !error ) 2035 { 2036 FT_Face root = &face->root; 2037 2038 2039 if ( FT_IS_SCALABLE( root ) ) 2040 { 2041 /* for the bbox we need the header only */ 2042 (void)tt_loader_init( &loader, size, glyph, load_flags, TRUE ); 2043 (void)load_truetype_glyph( &loader, glyph_index, 0, TRUE ); 2044 glyph->linearHoriAdvance = loader.linear; 2045 glyph->linearVertAdvance = loader.top_bearing + loader.bbox.yMax - 2046 loader.vadvance; 2047 if ( face->postscript.isFixedPitch && 2048 ( load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 ) 2049 glyph->linearHoriAdvance = face->horizontal.advance_Width_Max; 2050 } 2051 2052 return TT_Err_Ok; 2053 } 2054 } 2055 2056 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 2057 2058 /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */ 2059 if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid ) 2060 return TT_Err_Invalid_Size_Handle; 2061 2062 if ( load_flags & FT_LOAD_SBITS_ONLY ) 2063 return TT_Err_Invalid_Argument; 2064 2065 error = tt_loader_init( &loader, size, glyph, load_flags, FALSE ); 2066 if ( error ) 2067 return error; 2068 2069 glyph->format = FT_GLYPH_FORMAT_OUTLINE; 2070 glyph->num_subglyphs = 0; 2071 glyph->outline.flags = 0; 2072 2073 /* main loading loop */ 2074 error = load_truetype_glyph( &loader, glyph_index, 0, FALSE ); 2075 if ( !error ) 2076 { 2077 if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE ) 2078 { 2079 glyph->num_subglyphs = loader.gloader->base.num_subglyphs; 2080 glyph->subglyphs = loader.gloader->base.subglyphs; 2081 } 2082 else 2083 { 2084 glyph->outline = loader.gloader->base.outline; 2085 glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS; 2086 2087 /* Translate array so that (0,0) is the glyph's origin. Note */ 2088 /* that this behaviour is independent on the value of bit 1 of */ 2089 /* the `flags' field in the `head' table -- at least major */ 2090 /* applications like Acroread indicate that. */ 2091 if ( loader.pp1.x ) 2092 FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 ); 2093 } 2094 2095 #ifdef TT_USE_BYTECODE_INTERPRETER 2096 2097 if ( IS_HINTED( load_flags ) ) 2098 { 2099 if ( loader.exec->GS.scan_control ) 2100 { 2101 /* convert scan conversion mode to FT_OUTLINE_XXX flags */ 2102 switch ( loader.exec->GS.scan_type ) 2103 { 2104 case 0: /* simple drop-outs including stubs */ 2105 glyph->outline.flags |= FT_OUTLINE_INCLUDE_STUBS; 2106 break; 2107 case 1: /* simple drop-outs excluding stubs */ 2108 /* nothing; it's the default rendering mode */ 2109 break; 2110 case 4: /* smart drop-outs including stubs */ 2111 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS | 2112 FT_OUTLINE_INCLUDE_STUBS; 2113 break; 2114 case 5: /* smart drop-outs excluding stubs */ 2115 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS; 2116 break; 2117 2118 default: /* no drop-out control */ 2119 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; 2120 break; 2121 } 2122 } 2123 else 2124 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; 2125 } 2126 2127 #endif /* TT_USE_BYTECODE_INTERPRETER */ 2128 2129 compute_glyph_metrics( &loader, glyph_index ); 2130 } 2131 2132 /* Set the `high precision' bit flag. */ 2133 /* This is _critical_ to get correct output for monochrome */ 2134 /* TrueType glyphs at all sizes using the bytecode interpreter. */ 2135 /* */ 2136 if ( !( load_flags & FT_LOAD_NO_SCALE ) && 2137 size->root.metrics.y_ppem < 24 ) 2138 glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; 2139 2140 return error; 2141 } 2142 2143 2144 /* END */ 2145
