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