ttgload.c revision cf4224adb9f1ddd7feccc585e162304829f6bd40
1/***************************************************************************/ 2/* */ 3/* ttgload.c */ 4/* */ 5/* TrueType Glyph Loader (body). */ 6/* */ 7/* Copyright 1996-2016 by */ 8/* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9/* */ 10/* This file is part of the FreeType project, and may only be used, */ 11/* modified, and distributed under the terms of the FreeType project */ 12/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13/* this file you indicate that you have read the license and */ 14/* understand and accept it fully. */ 15/* */ 16/***************************************************************************/ 17 18 19#include <ft2build.h> 20#include FT_INTERNAL_DEBUG_H 21#include FT_INTERNAL_CALC_H 22#include FT_INTERNAL_STREAM_H 23#include FT_INTERNAL_SFNT_H 24#include FT_TRUETYPE_TAGS_H 25#include FT_OUTLINE_H 26#include FT_TRUETYPE_DRIVER_H 27#include FT_LIST_H 28 29#include "ttgload.h" 30#include "ttpload.h" 31 32#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 33#include "ttgxvar.h" 34#endif 35 36#include "tterrors.h" 37#include "ttsubpix.h" 38 39 40 /*************************************************************************/ 41 /* */ 42 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 43 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 44 /* messages during execution. */ 45 /* */ 46#undef FT_COMPONENT 47#define FT_COMPONENT trace_ttgload 48 49 50 /*************************************************************************/ 51 /* */ 52 /* Composite glyph flags. */ 53 /* */ 54#define ARGS_ARE_WORDS 0x0001 55#define ARGS_ARE_XY_VALUES 0x0002 56#define ROUND_XY_TO_GRID 0x0004 57#define WE_HAVE_A_SCALE 0x0008 58/* reserved 0x0010 */ 59#define MORE_COMPONENTS 0x0020 60#define WE_HAVE_AN_XY_SCALE 0x0040 61#define WE_HAVE_A_2X2 0x0080 62#define WE_HAVE_INSTR 0x0100 63#define USE_MY_METRICS 0x0200 64#define OVERLAP_COMPOUND 0x0400 65#define SCALED_COMPONENT_OFFSET 0x0800 66#define UNSCALED_COMPONENT_OFFSET 0x1000 67 68 69 /*************************************************************************/ 70 /* */ 71 /* Return the horizontal metrics in font units for a given glyph. */ 72 /* */ 73 FT_LOCAL_DEF( void ) 74 TT_Get_HMetrics( TT_Face face, 75 FT_UInt idx, 76 FT_Short* lsb, 77 FT_UShort* aw ) 78 { 79 ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw ); 80 81 FT_TRACE5(( " advance width (font units): %d\n", *aw )); 82 FT_TRACE5(( " left side bearing (font units): %d\n", *lsb )); 83 } 84 85 86 /*************************************************************************/ 87 /* */ 88 /* Return the vertical metrics in font units for a given glyph. */ 89 /* See macro `TT_LOADER_SET_PP' below for explanations. */ 90 /* */ 91 FT_LOCAL_DEF( void ) 92 TT_Get_VMetrics( TT_Face face, 93 FT_UInt idx, 94 FT_Pos yMax, 95 FT_Short* tsb, 96 FT_UShort* ah ) 97 { 98 if ( face->vertical_info ) 99 ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah ); 100 101 else if ( face->os2.version != 0xFFFFU ) 102 { 103 *tsb = (FT_Short)( face->os2.sTypoAscender - yMax ); 104 *ah = (FT_UShort)FT_ABS( face->os2.sTypoAscender - 105 face->os2.sTypoDescender ); 106 } 107 108 else 109 { 110 *tsb = (FT_Short)( face->horizontal.Ascender - yMax ); 111 *ah = (FT_UShort)FT_ABS( face->horizontal.Ascender - 112 face->horizontal.Descender ); 113 } 114 115 FT_TRACE5(( " advance height (font units): %d\n", *ah )); 116 FT_TRACE5(( " top side bearing (font units): %d\n", *tsb )); 117 } 118 119 120 static FT_Error 121 tt_get_metrics( TT_Loader loader, 122 FT_UInt glyph_index ) 123 { 124 TT_Face face = loader->face; 125#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 126 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); 127#endif 128 129 FT_Error error; 130 FT_Stream stream = loader->stream; 131 132 FT_Short left_bearing = 0, top_bearing = 0; 133 FT_UShort advance_width = 0, advance_height = 0; 134 135 /* we must preserve the stream position */ 136 /* (which gets altered by the metrics functions) */ 137 FT_ULong pos = FT_STREAM_POS(); 138 139 140 TT_Get_HMetrics( face, glyph_index, 141 &left_bearing, 142 &advance_width ); 143 TT_Get_VMetrics( face, glyph_index, 144 loader->bbox.yMax, 145 &top_bearing, 146 &advance_height ); 147 148 if ( FT_STREAM_SEEK( pos ) ) 149 return error; 150 151 loader->left_bearing = left_bearing; 152 loader->advance = advance_width; 153 loader->top_bearing = top_bearing; 154 loader->vadvance = advance_height; 155 156#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 157 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 && 158 loader->exec ) 159 { 160 loader->exec->sph_tweak_flags = 0; 161 162 /* This may not be the right place for this, but it works... */ 163 /* Note that we have to unconditionally load the tweaks since */ 164 /* it is possible that glyphs individually switch ClearType's */ 165 /* backwards compatibility mode on and off. */ 166 sph_set_tweaks( loader, glyph_index ); 167 } 168#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */ 169 170 if ( !loader->linear_def ) 171 { 172 loader->linear_def = 1; 173 loader->linear = advance_width; 174 } 175 176 return FT_Err_Ok; 177 } 178 179 180#ifdef FT_CONFIG_OPTION_INCREMENTAL 181 182 static void 183 tt_get_metrics_incr_overrides( TT_Loader loader, 184 FT_UInt glyph_index ) 185 { 186 TT_Face face = loader->face; 187 188 FT_Short left_bearing = 0, top_bearing = 0; 189 FT_UShort advance_width = 0, advance_height = 0; 190 191 192 /* If this is an incrementally loaded font check whether there are */ 193 /* overriding metrics for this glyph. */ 194 if ( face->root.internal->incremental_interface && 195 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 196 { 197 FT_Incremental_MetricsRec metrics; 198 FT_Error error; 199 200 201 metrics.bearing_x = loader->left_bearing; 202 metrics.bearing_y = 0; 203 metrics.advance = loader->advance; 204 metrics.advance_v = 0; 205 206 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 207 face->root.internal->incremental_interface->object, 208 glyph_index, FALSE, &metrics ); 209 if ( error ) 210 goto Exit; 211 212 left_bearing = (FT_Short)metrics.bearing_x; 213 advance_width = (FT_UShort)metrics.advance; 214 215#if 0 216 217 /* GWW: Do I do the same for vertical metrics? */ 218 metrics.bearing_x = 0; 219 metrics.bearing_y = loader->top_bearing; 220 metrics.advance = loader->vadvance; 221 222 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 223 face->root.internal->incremental_interface->object, 224 glyph_index, TRUE, &metrics ); 225 if ( error ) 226 goto Exit; 227 228 top_bearing = (FT_Short)metrics.bearing_y; 229 advance_height = (FT_UShort)metrics.advance; 230 231#endif /* 0 */ 232 233 loader->left_bearing = left_bearing; 234 loader->advance = advance_width; 235 loader->top_bearing = top_bearing; 236 loader->vadvance = advance_height; 237 238 if ( !loader->linear_def ) 239 { 240 loader->linear_def = 1; 241 loader->linear = advance_width; 242 } 243 } 244 245 Exit: 246 return; 247 } 248 249#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 250 251 252 /*************************************************************************/ 253 /* */ 254 /* The following functions are used by default with TrueType fonts. */ 255 /* However, they can be replaced by alternatives if we need to support */ 256 /* TrueType-compressed formats (like MicroType) in the future. */ 257 /* */ 258 /*************************************************************************/ 259 260 FT_CALLBACK_DEF( FT_Error ) 261 TT_Access_Glyph_Frame( TT_Loader loader, 262 FT_UInt glyph_index, 263 FT_ULong offset, 264 FT_UInt byte_count ) 265 { 266 FT_Error error; 267 FT_Stream stream = loader->stream; 268 269 /* for non-debug mode */ 270 FT_UNUSED( glyph_index ); 271 272 273 FT_TRACE4(( "Glyph %ld\n", glyph_index )); 274 275 /* the following line sets the `error' variable through macros! */ 276 if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) ) 277 return error; 278 279 loader->cursor = stream->cursor; 280 loader->limit = stream->limit; 281 282 return FT_Err_Ok; 283 } 284 285 286 FT_CALLBACK_DEF( void ) 287 TT_Forget_Glyph_Frame( TT_Loader loader ) 288 { 289 FT_Stream stream = loader->stream; 290 291 292 FT_FRAME_EXIT(); 293 } 294 295 296 FT_CALLBACK_DEF( FT_Error ) 297 TT_Load_Glyph_Header( TT_Loader loader ) 298 { 299 FT_Byte* p = loader->cursor; 300 FT_Byte* limit = loader->limit; 301 302 303 if ( p + 10 > limit ) 304 return FT_THROW( Invalid_Outline ); 305 306 loader->n_contours = FT_NEXT_SHORT( p ); 307 308 loader->bbox.xMin = FT_NEXT_SHORT( p ); 309 loader->bbox.yMin = FT_NEXT_SHORT( p ); 310 loader->bbox.xMax = FT_NEXT_SHORT( p ); 311 loader->bbox.yMax = FT_NEXT_SHORT( p ); 312 313 FT_TRACE5(( " # of contours: %d\n", loader->n_contours )); 314 FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin, 315 loader->bbox.xMax )); 316 FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin, 317 loader->bbox.yMax )); 318 loader->cursor = p; 319 320 return FT_Err_Ok; 321 } 322 323 324 FT_CALLBACK_DEF( FT_Error ) 325 TT_Load_Simple_Glyph( TT_Loader load ) 326 { 327 FT_Error error; 328 FT_Byte* p = load->cursor; 329 FT_Byte* limit = load->limit; 330 FT_GlyphLoader gloader = load->gloader; 331 FT_Int n_contours = load->n_contours; 332 FT_Outline* outline; 333 FT_UShort n_ins; 334 FT_Int n_points; 335 FT_ULong tmp; 336 337 FT_Byte *flag, *flag_limit; 338 FT_Byte c, count; 339 FT_Vector *vec, *vec_limit; 340 FT_Pos x; 341 FT_Short *cont, *cont_limit, prev_cont; 342 FT_Int xy_size = 0; 343 344 345 /* check that we can add the contours to the glyph */ 346 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours ); 347 if ( error ) 348 goto Fail; 349 350 /* reading the contours' endpoints & number of points */ 351 cont = gloader->current.outline.contours; 352 cont_limit = cont + n_contours; 353 354 /* check space for contours array + instructions count */ 355 if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit ) 356 goto Invalid_Outline; 357 358 prev_cont = FT_NEXT_SHORT( p ); 359 360 if ( n_contours > 0 ) 361 cont[0] = prev_cont; 362 363 if ( prev_cont < 0 ) 364 goto Invalid_Outline; 365 366 for ( cont++; cont < cont_limit; cont++ ) 367 { 368 cont[0] = FT_NEXT_SHORT( p ); 369 if ( cont[0] <= prev_cont ) 370 { 371 /* unordered contours: this is invalid */ 372 goto Invalid_Outline; 373 } 374 prev_cont = cont[0]; 375 } 376 377 n_points = 0; 378 if ( n_contours > 0 ) 379 { 380 n_points = cont[-1] + 1; 381 if ( n_points < 0 ) 382 goto Invalid_Outline; 383 } 384 385 /* note that we will add four phantom points later */ 386 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 ); 387 if ( error ) 388 goto Fail; 389 390 /* reading the bytecode instructions */ 391 load->glyph->control_len = 0; 392 load->glyph->control_data = NULL; 393 394 if ( p + 2 > limit ) 395 goto Invalid_Outline; 396 397 n_ins = FT_NEXT_USHORT( p ); 398 399 FT_TRACE5(( " Instructions size: %u\n", n_ins )); 400 401 /* check it */ 402 if ( ( limit - p ) < n_ins ) 403 { 404 FT_TRACE0(( "TT_Load_Simple_Glyph: instruction count mismatch\n" )); 405 error = FT_THROW( Too_Many_Hints ); 406 goto Fail; 407 } 408 409#ifdef TT_USE_BYTECODE_INTERPRETER 410 411 if ( IS_HINTED( load->load_flags ) ) 412 { 413 /* we don't trust `maxSizeOfInstructions' in the `maxp' table */ 414 /* and thus update the bytecode array size by ourselves */ 415 416 tmp = load->exec->glyphSize; 417 error = Update_Max( load->exec->memory, 418 &tmp, 419 sizeof ( FT_Byte ), 420 (void*)&load->exec->glyphIns, 421 n_ins ); 422 423 load->exec->glyphSize = (FT_UShort)tmp; 424 if ( error ) 425 return error; 426 427 load->glyph->control_len = n_ins; 428 load->glyph->control_data = load->exec->glyphIns; 429 430 if ( n_ins ) 431 FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins ); 432 } 433 434#endif /* TT_USE_BYTECODE_INTERPRETER */ 435 436 p += n_ins; 437 438 outline = &gloader->current.outline; 439 440 /* reading the point tags */ 441 flag = (FT_Byte*)outline->tags; 442 flag_limit = flag + n_points; 443 444 FT_ASSERT( flag != NULL ); 445 446 while ( flag < flag_limit ) 447 { 448 if ( p + 1 > limit ) 449 goto Invalid_Outline; 450 451 *flag++ = c = FT_NEXT_BYTE( p ); 452 if ( c & 8 ) 453 { 454 if ( p + 1 > limit ) 455 goto Invalid_Outline; 456 457 count = FT_NEXT_BYTE( p ); 458 if ( flag + (FT_Int)count > flag_limit ) 459 goto Invalid_Outline; 460 461 for ( ; count > 0; count-- ) 462 *flag++ = c; 463 } 464 } 465 466 /* reading the X coordinates */ 467 468 vec = outline->points; 469 vec_limit = vec + n_points; 470 flag = (FT_Byte*)outline->tags; 471 x = 0; 472 473 if ( p + xy_size > limit ) 474 goto Invalid_Outline; 475 476 for ( ; vec < vec_limit; vec++, flag++ ) 477 { 478 FT_Pos y = 0; 479 FT_Byte f = *flag; 480 481 482 if ( f & 2 ) 483 { 484 if ( p + 1 > limit ) 485 goto Invalid_Outline; 486 487 y = (FT_Pos)FT_NEXT_BYTE( p ); 488 if ( ( f & 16 ) == 0 ) 489 y = -y; 490 } 491 else if ( ( f & 16 ) == 0 ) 492 { 493 if ( p + 2 > limit ) 494 goto Invalid_Outline; 495 496 y = (FT_Pos)FT_NEXT_SHORT( p ); 497 } 498 499 x += y; 500 vec->x = x; 501 /* the cast is for stupid compilers */ 502 *flag = (FT_Byte)( f & ~( 2 | 16 ) ); 503 } 504 505 /* reading the Y coordinates */ 506 507 vec = gloader->current.outline.points; 508 vec_limit = vec + n_points; 509 flag = (FT_Byte*)outline->tags; 510 x = 0; 511 512 for ( ; vec < vec_limit; vec++, flag++ ) 513 { 514 FT_Pos y = 0; 515 FT_Byte f = *flag; 516 517 518 if ( f & 4 ) 519 { 520 if ( p + 1 > limit ) 521 goto Invalid_Outline; 522 523 y = (FT_Pos)FT_NEXT_BYTE( p ); 524 if ( ( f & 32 ) == 0 ) 525 y = -y; 526 } 527 else if ( ( f & 32 ) == 0 ) 528 { 529 if ( p + 2 > limit ) 530 goto Invalid_Outline; 531 532 y = (FT_Pos)FT_NEXT_SHORT( p ); 533 } 534 535 x += y; 536 vec->y = x; 537 /* the cast is for stupid compilers */ 538 *flag = (FT_Byte)( f & FT_CURVE_TAG_ON ); 539 } 540 541 outline->n_points = (FT_Short)n_points; 542 outline->n_contours = (FT_Short)n_contours; 543 544 load->cursor = p; 545 546 Fail: 547 return error; 548 549 Invalid_Outline: 550 error = FT_THROW( Invalid_Outline ); 551 goto Fail; 552 } 553 554 555 FT_CALLBACK_DEF( FT_Error ) 556 TT_Load_Composite_Glyph( TT_Loader loader ) 557 { 558 FT_Error error; 559 FT_Byte* p = loader->cursor; 560 FT_Byte* limit = loader->limit; 561 FT_GlyphLoader gloader = loader->gloader; 562 FT_SubGlyph subglyph; 563 FT_UInt num_subglyphs; 564 565 566 num_subglyphs = 0; 567 568 do 569 { 570 FT_Fixed xx, xy, yy, yx; 571 FT_UInt count; 572 573 574 /* check that we can load a new subglyph */ 575 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 ); 576 if ( error ) 577 goto Fail; 578 579 /* check space */ 580 if ( p + 4 > limit ) 581 goto Invalid_Composite; 582 583 subglyph = gloader->current.subglyphs + num_subglyphs; 584 585 subglyph->arg1 = subglyph->arg2 = 0; 586 587 subglyph->flags = FT_NEXT_USHORT( p ); 588 subglyph->index = FT_NEXT_USHORT( p ); 589 590 /* check space */ 591 count = 2; 592 if ( subglyph->flags & ARGS_ARE_WORDS ) 593 count += 2; 594 if ( subglyph->flags & WE_HAVE_A_SCALE ) 595 count += 2; 596 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 597 count += 4; 598 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 599 count += 8; 600 601 if ( p + count > limit ) 602 goto Invalid_Composite; 603 604 /* read arguments */ 605 if ( subglyph->flags & ARGS_ARE_XY_VALUES ) 606 { 607 if ( subglyph->flags & ARGS_ARE_WORDS ) 608 { 609 subglyph->arg1 = FT_NEXT_SHORT( p ); 610 subglyph->arg2 = FT_NEXT_SHORT( p ); 611 } 612 else 613 { 614 subglyph->arg1 = FT_NEXT_CHAR( p ); 615 subglyph->arg2 = FT_NEXT_CHAR( p ); 616 } 617 } 618 else 619 { 620 if ( subglyph->flags & ARGS_ARE_WORDS ) 621 { 622 subglyph->arg1 = (FT_Int)FT_NEXT_USHORT( p ); 623 subglyph->arg2 = (FT_Int)FT_NEXT_USHORT( p ); 624 } 625 else 626 { 627 subglyph->arg1 = (FT_Int)FT_NEXT_BYTE( p ); 628 subglyph->arg2 = (FT_Int)FT_NEXT_BYTE( p ); 629 } 630 } 631 632 /* read transform */ 633 xx = yy = 0x10000L; 634 xy = yx = 0; 635 636 if ( subglyph->flags & WE_HAVE_A_SCALE ) 637 { 638 xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; 639 yy = xx; 640 } 641 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 642 { 643 xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; 644 yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; 645 } 646 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 647 { 648 xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; 649 yx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; 650 xy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; 651 yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; 652 } 653 654 subglyph->transform.xx = xx; 655 subglyph->transform.xy = xy; 656 subglyph->transform.yx = yx; 657 subglyph->transform.yy = yy; 658 659 num_subglyphs++; 660 661 } while ( subglyph->flags & MORE_COMPONENTS ); 662 663 gloader->current.num_subglyphs = num_subglyphs; 664 FT_TRACE5(( " %d components\n", num_subglyphs )); 665 666#ifdef TT_USE_BYTECODE_INTERPRETER 667 668 { 669 FT_Stream stream = loader->stream; 670 671 672 /* we must undo the FT_FRAME_ENTER in order to point */ 673 /* to the composite instructions, if we find some. */ 674 /* We will process them later. */ 675 /* */ 676 loader->ins_pos = (FT_ULong)( FT_STREAM_POS() + 677 p - limit ); 678 } 679 680#endif 681 682 loader->cursor = p; 683 684 Fail: 685 return error; 686 687 Invalid_Composite: 688 error = FT_THROW( Invalid_Composite ); 689 goto Fail; 690 } 691 692 693 FT_LOCAL_DEF( void ) 694 TT_Init_Glyph_Loading( TT_Face face ) 695 { 696 face->access_glyph_frame = TT_Access_Glyph_Frame; 697 face->read_glyph_header = TT_Load_Glyph_Header; 698 face->read_simple_glyph = TT_Load_Simple_Glyph; 699 face->read_composite_glyph = TT_Load_Composite_Glyph; 700 face->forget_glyph_frame = TT_Forget_Glyph_Frame; 701 } 702 703 704 static void 705 tt_prepare_zone( TT_GlyphZone zone, 706 FT_GlyphLoad load, 707 FT_UInt start_point, 708 FT_UInt start_contour ) 709 { 710 zone->n_points = (FT_UShort)load->outline.n_points - 711 (FT_UShort)start_point; 712 zone->n_contours = load->outline.n_contours - 713 (FT_Short)start_contour; 714 zone->org = load->extra_points + start_point; 715 zone->cur = load->outline.points + start_point; 716 zone->orus = load->extra_points2 + start_point; 717 zone->tags = (FT_Byte*)load->outline.tags + start_point; 718 zone->contours = (FT_UShort*)load->outline.contours + start_contour; 719 zone->first_point = (FT_UShort)start_point; 720 } 721 722 723 /*************************************************************************/ 724 /* */ 725 /* <Function> */ 726 /* TT_Hint_Glyph */ 727 /* */ 728 /* <Description> */ 729 /* Hint the glyph using the zone prepared by the caller. Note that */ 730 /* the zone is supposed to include four phantom points. */ 731 /* */ 732 static FT_Error 733 TT_Hint_Glyph( TT_Loader loader, 734 FT_Bool is_composite ) 735 { 736#if defined TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY || \ 737 defined TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 738 TT_Face face = loader->face; 739 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); 740#endif 741 742 TT_GlyphZone zone = &loader->zone; 743 744#ifdef TT_USE_BYTECODE_INTERPRETER 745 FT_Long n_ins; 746#else 747 FT_UNUSED( is_composite ); 748#endif 749 750 751#ifdef TT_USE_BYTECODE_INTERPRETER 752 if ( loader->glyph->control_len > 0xFFFFL ) 753 { 754 FT_TRACE1(( "TT_Hint_Glyph: too long instructions" )); 755 FT_TRACE1(( " (0x%lx byte) is truncated\n", 756 loader->glyph->control_len )); 757 } 758 n_ins = loader->glyph->control_len; 759 760 /* save original point position in org */ 761 if ( n_ins > 0 ) 762 FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points ); 763 764 /* Reset graphics state. */ 765 loader->exec->GS = loader->size->GS; 766 767 /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */ 768 /* completely refer to the (already) hinted subglyphs. */ 769 if ( is_composite ) 770 { 771 loader->exec->metrics.x_scale = 1 << 16; 772 loader->exec->metrics.y_scale = 1 << 16; 773 774 FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points ); 775 } 776 else 777 { 778 loader->exec->metrics.x_scale = loader->size->metrics.x_scale; 779 loader->exec->metrics.y_scale = loader->size->metrics.y_scale; 780 } 781#endif 782 783 /* round phantom points */ 784 zone->cur[zone->n_points - 4].x = 785 FT_PIX_ROUND( zone->cur[zone->n_points - 4].x ); 786 zone->cur[zone->n_points - 3].x = 787 FT_PIX_ROUND( zone->cur[zone->n_points - 3].x ); 788 zone->cur[zone->n_points - 2].y = 789 FT_PIX_ROUND( zone->cur[zone->n_points - 2].y ); 790 zone->cur[zone->n_points - 1].y = 791 FT_PIX_ROUND( zone->cur[zone->n_points - 1].y ); 792 793#ifdef TT_USE_BYTECODE_INTERPRETER 794 795 if ( n_ins > 0 ) 796 { 797 FT_Error error; 798 799 FT_GlyphLoader gloader = loader->gloader; 800 FT_Outline current_outline = gloader->current.outline; 801 802 803 TT_Set_CodeRange( loader->exec, tt_coderange_glyph, 804 loader->exec->glyphIns, n_ins ); 805 806 loader->exec->is_composite = is_composite; 807 loader->exec->pts = *zone; 808 809 error = TT_Run_Context( loader->exec ); 810 if ( error && loader->exec->pedantic_hinting ) 811 return error; 812 813 /* store drop-out mode in bits 5-7; set bit 2 also as a marker */ 814 current_outline.tags[0] |= 815 ( loader->exec->GS.scan_type << 5 ) | FT_CURVE_TAG_HAS_SCANMODE; 816 } 817 818#endif 819 820#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 821 /* Save possibly modified glyph phantom points unless in v40 backwards */ 822 /* compatibility mode, where no movement on the x axis means no reason */ 823 /* to change bearings or advance widths. */ 824 if ( !( driver->interpreter_version == TT_INTERPRETER_VERSION_40 && 825 !loader->exec->backwards_compatibility ) ) 826 { 827#endif 828 loader->pp1 = zone->cur[zone->n_points - 4]; 829 loader->pp2 = zone->cur[zone->n_points - 3]; 830 loader->pp3 = zone->cur[zone->n_points - 2]; 831 loader->pp4 = zone->cur[zone->n_points - 1]; 832#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 833 } 834#endif 835 836#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 837 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 838 { 839 if ( loader->exec->sph_tweak_flags & SPH_TWEAK_DEEMBOLDEN ) 840 FT_Outline_EmboldenXY( &loader->gloader->current.outline, -24, 0 ); 841 842 else if ( loader->exec->sph_tweak_flags & SPH_TWEAK_EMBOLDEN ) 843 FT_Outline_EmboldenXY( &loader->gloader->current.outline, 24, 0 ); 844 } 845#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */ 846 847 return FT_Err_Ok; 848 } 849 850 851 /*************************************************************************/ 852 /* */ 853 /* <Function> */ 854 /* TT_Process_Simple_Glyph */ 855 /* */ 856 /* <Description> */ 857 /* Once a simple glyph has been loaded, it needs to be processed. */ 858 /* Usually, this means scaling and hinting through bytecode */ 859 /* interpretation. */ 860 /* */ 861 static FT_Error 862 TT_Process_Simple_Glyph( TT_Loader loader ) 863 { 864 FT_GlyphLoader gloader = loader->gloader; 865 FT_Error error = FT_Err_Ok; 866 FT_Outline* outline; 867 FT_Int n_points; 868 869 870 outline = &gloader->current.outline; 871 n_points = outline->n_points; 872 873 /* set phantom points */ 874 875 outline->points[n_points ] = loader->pp1; 876 outline->points[n_points + 1] = loader->pp2; 877 outline->points[n_points + 2] = loader->pp3; 878 outline->points[n_points + 3] = loader->pp4; 879 880 outline->tags[n_points ] = 0; 881 outline->tags[n_points + 1] = 0; 882 outline->tags[n_points + 2] = 0; 883 outline->tags[n_points + 3] = 0; 884 885 n_points += 4; 886 887#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 888 889 if ( loader->face->doblend ) 890 { 891 /* Deltas apply to the unscaled data. */ 892 error = TT_Vary_Apply_Glyph_Deltas( loader->face, 893 loader->glyph_index, 894 outline, 895 (FT_UInt)n_points ); 896 if ( error ) 897 return error; 898 } 899 900#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 901 902 if ( IS_HINTED( loader->load_flags ) ) 903 { 904 tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 ); 905 906 FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur, 907 loader->zone.n_points + 4 ); 908 } 909 910 { 911#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 912 TT_Face face = loader->face; 913 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); 914 915 FT_String* family = face->root.family_name; 916 FT_UInt ppem = loader->size->metrics.x_ppem; 917 FT_String* style = face->root.style_name; 918 FT_UInt x_scale_factor = 1000; 919#endif 920 921 FT_Vector* vec = outline->points; 922 FT_Vector* limit = outline->points + n_points; 923 924 FT_Fixed x_scale = 0; /* pacify compiler */ 925 FT_Fixed y_scale = 0; 926 927 FT_Bool do_scale = FALSE; 928 929 930#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 931 932 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 933 { 934 /* scale, but only if enabled and only if TT hinting is being used */ 935 if ( IS_HINTED( loader->load_flags ) ) 936 x_scale_factor = sph_test_tweak_x_scaling( face, 937 family, 938 ppem, 939 style, 940 loader->glyph_index ); 941 /* scale the glyph */ 942 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 || 943 x_scale_factor != 1000 ) 944 { 945 x_scale = FT_MulDiv( loader->size->metrics.x_scale, 946 (FT_Long)x_scale_factor, 1000 ); 947 y_scale = loader->size->metrics.y_scale; 948 949 /* compensate for any scaling by de/emboldening; */ 950 /* the amount was determined via experimentation */ 951 if ( x_scale_factor != 1000 && ppem > 11 ) 952 FT_Outline_EmboldenXY( outline, 953 FT_MulFix( 1280 * ppem, 954 1000 - x_scale_factor ), 955 0 ); 956 do_scale = TRUE; 957 } 958 } 959 else 960 961#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */ 962 963 { 964 /* scale the glyph */ 965 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 966 { 967 x_scale = loader->size->metrics.x_scale; 968 y_scale = loader->size->metrics.y_scale; 969 970 do_scale = TRUE; 971 } 972 } 973 974 if ( do_scale ) 975 { 976 for ( ; vec < limit; vec++ ) 977 { 978 vec->x = FT_MulFix( vec->x, x_scale ); 979 vec->y = FT_MulFix( vec->y, y_scale ); 980 } 981 982 loader->pp1 = outline->points[n_points - 4]; 983 loader->pp2 = outline->points[n_points - 3]; 984 loader->pp3 = outline->points[n_points - 2]; 985 loader->pp4 = outline->points[n_points - 1]; 986 } 987 } 988 989 if ( IS_HINTED( loader->load_flags ) ) 990 { 991 loader->zone.n_points += 4; 992 993 error = TT_Hint_Glyph( loader, 0 ); 994 } 995 996 return error; 997 } 998 999 1000 /*************************************************************************/ 1001 /* */ 1002 /* <Function> */ 1003 /* TT_Process_Composite_Component */ 1004 /* */ 1005 /* <Description> */ 1006 /* Once a composite component has been loaded, it needs to be */ 1007 /* processed. Usually, this means transforming and translating. */ 1008 /* */ 1009 static FT_Error 1010 TT_Process_Composite_Component( TT_Loader loader, 1011 FT_SubGlyph subglyph, 1012 FT_UInt start_point, 1013 FT_UInt num_base_points ) 1014 { 1015 FT_GlyphLoader gloader = loader->gloader; 1016 FT_Outline current; 1017 FT_Bool have_scale; 1018 FT_Pos x, y; 1019 1020 1021 current.points = gloader->base.outline.points + 1022 num_base_points; 1023 current.n_points = gloader->base.outline.n_points - 1024 (short)num_base_points; 1025 1026 have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE | 1027 WE_HAVE_AN_XY_SCALE | 1028 WE_HAVE_A_2X2 ) ); 1029 1030 /* perform the transform required for this subglyph */ 1031 if ( have_scale ) 1032 FT_Outline_Transform( ¤t, &subglyph->transform ); 1033 1034 /* get offset */ 1035 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) 1036 { 1037 FT_UInt num_points = (FT_UInt)gloader->base.outline.n_points; 1038 FT_UInt k = (FT_UInt)subglyph->arg1; 1039 FT_UInt l = (FT_UInt)subglyph->arg2; 1040 FT_Vector* p1; 1041 FT_Vector* p2; 1042 1043 1044 /* match l-th point of the newly loaded component to the k-th point */ 1045 /* of the previously loaded components. */ 1046 1047 /* change to the point numbers used by our outline */ 1048 k += start_point; 1049 l += num_base_points; 1050 if ( k >= num_base_points || 1051 l >= num_points ) 1052 return FT_THROW( Invalid_Composite ); 1053 1054 p1 = gloader->base.outline.points + k; 1055 p2 = gloader->base.outline.points + l; 1056 1057 x = p1->x - p2->x; 1058 y = p1->y - p2->y; 1059 } 1060 else 1061 { 1062 x = subglyph->arg1; 1063 y = subglyph->arg2; 1064 1065 if ( !x && !y ) 1066 return FT_Err_Ok; 1067 1068 /* Use a default value dependent on */ 1069 /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old */ 1070 /* TT fonts which don't set the xxx_COMPONENT_OFFSET bit. */ 1071 1072 if ( have_scale && 1073#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED 1074 !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) ) 1075#else 1076 ( subglyph->flags & SCALED_COMPONENT_OFFSET ) ) 1077#endif 1078 { 1079 1080#if 0 1081 1082 /*******************************************************************/ 1083 /* */ 1084 /* This algorithm is what Apple documents. But it doesn't work. */ 1085 /* */ 1086 int a = subglyph->transform.xx > 0 ? subglyph->transform.xx 1087 : -subglyph->transform.xx; 1088 int b = subglyph->transform.yx > 0 ? subglyph->transform.yx 1089 : -subglyph->transform.yx; 1090 int c = subglyph->transform.xy > 0 ? subglyph->transform.xy 1091 : -subglyph->transform.xy; 1092 int d = subglyph->transform.yy > 0 ? subglyph->transform.yy 1093 : -subglyph->transform.yy; 1094 int m = a > b ? a : b; 1095 int n = c > d ? c : d; 1096 1097 1098 if ( a - b <= 33 && a - b >= -33 ) 1099 m *= 2; 1100 if ( c - d <= 33 && c - d >= -33 ) 1101 n *= 2; 1102 x = FT_MulFix( x, m ); 1103 y = FT_MulFix( y, n ); 1104 1105#else /* 1 */ 1106 1107 /*******************************************************************/ 1108 /* */ 1109 /* This algorithm is a guess and works much better than the above. */ 1110 /* */ 1111 FT_Fixed mac_xscale = FT_Hypot( subglyph->transform.xx, 1112 subglyph->transform.xy ); 1113 FT_Fixed mac_yscale = FT_Hypot( subglyph->transform.yy, 1114 subglyph->transform.yx ); 1115 1116 1117 x = FT_MulFix( x, mac_xscale ); 1118 y = FT_MulFix( y, mac_yscale ); 1119 1120#endif /* 1 */ 1121 1122 } 1123 1124 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1125 { 1126 FT_Fixed x_scale = loader->size->metrics.x_scale; 1127 FT_Fixed y_scale = loader->size->metrics.y_scale; 1128 1129 1130 x = FT_MulFix( x, x_scale ); 1131 y = FT_MulFix( y, y_scale ); 1132 1133 if ( subglyph->flags & ROUND_XY_TO_GRID ) 1134 { 1135 x = FT_PIX_ROUND( x ); 1136 y = FT_PIX_ROUND( y ); 1137 } 1138 } 1139 } 1140 1141 if ( x || y ) 1142 FT_Outline_Translate( ¤t, x, y ); 1143 1144 return FT_Err_Ok; 1145 } 1146 1147 1148 /*************************************************************************/ 1149 /* */ 1150 /* <Function> */ 1151 /* TT_Process_Composite_Glyph */ 1152 /* */ 1153 /* <Description> */ 1154 /* This is slightly different from TT_Process_Simple_Glyph, in that */ 1155 /* its sole purpose is to hint the glyph. Thus this function is */ 1156 /* only available when bytecode interpreter is enabled. */ 1157 /* */ 1158 static FT_Error 1159 TT_Process_Composite_Glyph( TT_Loader loader, 1160 FT_UInt start_point, 1161 FT_UInt start_contour ) 1162 { 1163 FT_Error error; 1164 FT_Outline* outline; 1165 FT_UInt i; 1166 1167 1168 outline = &loader->gloader->base.outline; 1169 1170 /* make room for phantom points */ 1171 error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader, 1172 outline->n_points + 4, 1173 0 ); 1174 if ( error ) 1175 return error; 1176 1177 outline->points[outline->n_points ] = loader->pp1; 1178 outline->points[outline->n_points + 1] = loader->pp2; 1179 outline->points[outline->n_points + 2] = loader->pp3; 1180 outline->points[outline->n_points + 3] = loader->pp4; 1181 1182 outline->tags[outline->n_points ] = 0; 1183 outline->tags[outline->n_points + 1] = 0; 1184 outline->tags[outline->n_points + 2] = 0; 1185 outline->tags[outline->n_points + 3] = 0; 1186 1187#ifdef TT_USE_BYTECODE_INTERPRETER 1188 1189 { 1190 FT_Stream stream = loader->stream; 1191 FT_UShort n_ins, max_ins; 1192 FT_ULong tmp; 1193 1194 1195 /* TT_Load_Composite_Glyph only gives us the offset of instructions */ 1196 /* so we read them here */ 1197 if ( FT_STREAM_SEEK( loader->ins_pos ) || 1198 FT_READ_USHORT( n_ins ) ) 1199 return error; 1200 1201 FT_TRACE5(( " Instructions size = %d\n", n_ins )); 1202 1203 /* check it */ 1204 max_ins = loader->face->max_profile.maxSizeOfInstructions; 1205 if ( n_ins > max_ins ) 1206 { 1207 /* don't trust `maxSizeOfInstructions'; */ 1208 /* only do a rough safety check */ 1209 if ( (FT_Int)n_ins > loader->byte_len ) 1210 { 1211 FT_TRACE1(( "TT_Process_Composite_Glyph:" 1212 " too many instructions (%d) for glyph with length %d\n", 1213 n_ins, loader->byte_len )); 1214 return FT_THROW( Too_Many_Hints ); 1215 } 1216 1217 tmp = loader->exec->glyphSize; 1218 error = Update_Max( loader->exec->memory, 1219 &tmp, 1220 sizeof ( FT_Byte ), 1221 (void*)&loader->exec->glyphIns, 1222 n_ins ); 1223 1224 loader->exec->glyphSize = (FT_UShort)tmp; 1225 if ( error ) 1226 return error; 1227 } 1228 else if ( n_ins == 0 ) 1229 return FT_Err_Ok; 1230 1231 if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) ) 1232 return error; 1233 1234 loader->glyph->control_data = loader->exec->glyphIns; 1235 loader->glyph->control_len = n_ins; 1236 } 1237 1238#endif 1239 1240 tt_prepare_zone( &loader->zone, &loader->gloader->base, 1241 start_point, start_contour ); 1242 1243 /* Some points are likely touched during execution of */ 1244 /* instructions on components. So let's untouch them. */ 1245 for ( i = 0; i < loader->zone.n_points; i++ ) 1246 loader->zone.tags[i] &= ~FT_CURVE_TAG_TOUCH_BOTH; 1247 1248 loader->zone.n_points += 4; 1249 1250 return TT_Hint_Glyph( loader, 1 ); 1251 } 1252 1253 1254 /* 1255 * Calculate the phantom points 1256 * 1257 * Defining the right side bearing (rsb) as 1258 * 1259 * rsb = aw - (lsb + xmax - xmin) 1260 * 1261 * (with `aw' the advance width, `lsb' the left side bearing, and `xmin' 1262 * and `xmax' the glyph's minimum and maximum x value), the OpenType 1263 * specification defines the initial position of horizontal phantom points 1264 * as 1265 * 1266 * pp1 = (round(xmin - lsb), 0) , 1267 * pp2 = (round(pp1 + aw), 0) . 1268 * 1269 * Note that the rounding to the grid (in the device space) is not 1270 * documented currently in the specification. 1271 * 1272 * However, the specification lacks the precise definition of vertical 1273 * phantom points. Greg Hitchcock provided the following explanation. 1274 * 1275 * - a `vmtx' table is present 1276 * 1277 * For any glyph, the minimum and maximum y values (`ymin' and `ymax') 1278 * are given in the `glyf' table, the top side bearing (tsb) and advance 1279 * height (ah) are given in the `vmtx' table. The bottom side bearing 1280 * (bsb) is then calculated as 1281 * 1282 * bsb = ah - (tsb + ymax - ymin) , 1283 * 1284 * and the initial position of vertical phantom points is 1285 * 1286 * pp3 = (x, round(ymax + tsb)) , 1287 * pp4 = (x, round(pp3 - ah)) . 1288 * 1289 * See below for value `x'. 1290 * 1291 * - no `vmtx' table in the font 1292 * 1293 * If there is an `OS/2' table, we set 1294 * 1295 * DefaultAscender = sTypoAscender , 1296 * DefaultDescender = sTypoDescender , 1297 * 1298 * otherwise we use data from the `hhea' table: 1299 * 1300 * DefaultAscender = Ascender , 1301 * DefaultDescender = Descender . 1302 * 1303 * With these two variables we can now set 1304 * 1305 * ah = DefaultAscender - sDefaultDescender , 1306 * tsb = DefaultAscender - yMax , 1307 * 1308 * and proceed as if a `vmtx' table was present. 1309 * 1310 * Usually we have 1311 * 1312 * x = aw / 2 , (1) 1313 * 1314 * but there is one compatibility case where it can be set to 1315 * 1316 * x = -DefaultDescender - 1317 * ((DefaultAscender - DefaultDescender - aw) / 2) . (2) 1318 * 1319 * and another one with 1320 * 1321 * x = 0 . (3) 1322 * 1323 * In Windows, the history of those values is quite complicated, 1324 * depending on the hinting engine (that is, the graphics framework). 1325 * 1326 * framework from to formula 1327 * ---------------------------------------------------------- 1328 * GDI Windows 98 current (1) 1329 * (Windows 2000 for NT) 1330 * GDI+ Windows XP Windows 7 (2) 1331 * GDI+ Windows 8 current (3) 1332 * DWrite Windows 7 current (3) 1333 * 1334 * For simplicity, FreeType uses (1) for grayscale subpixel hinting and 1335 * (3) for everything else. 1336 * 1337 */ 1338 static void 1339 tt_loader_set_pp( TT_Loader loader ) 1340 { 1341 FT_Bool subpixel_hinting = 0; 1342 FT_Bool grayscale = 0; 1343 FT_Bool use_aw_2 = 0; 1344 1345#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 1346 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( loader->face ); 1347#endif 1348 1349#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 1350 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 1351 { 1352 subpixel_hinting = loader->exec ? loader->exec->subpixel_hinting 1353 : 0; 1354 grayscale = loader->exec ? loader->exec->grayscale 1355 : 0; 1356 } 1357#endif 1358#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 1359 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_40 ) 1360 { 1361 subpixel_hinting = loader->exec ? loader->exec->subpixel_hinting_lean 1362 : 0; 1363 grayscale = loader->exec ? loader->exec->grayscale_cleartype 1364 : 0; 1365 } 1366#endif 1367 1368 use_aw_2 = (FT_Bool)( subpixel_hinting && grayscale ); 1369 1370 loader->pp1.x = loader->bbox.xMin - loader->left_bearing; 1371 loader->pp1.y = 0; 1372 loader->pp2.x = loader->pp1.x + loader->advance; 1373 loader->pp2.y = 0; 1374 1375 loader->pp3.x = use_aw_2 ? loader->advance / 2 : 0; 1376 loader->pp3.y = loader->bbox.yMax + loader->top_bearing; 1377 loader->pp4.x = use_aw_2 ? loader->advance / 2 : 0; 1378 loader->pp4.y = loader->pp3.y - loader->vadvance; 1379 } 1380 1381 1382 /* a utility function to retrieve i-th node from given FT_List */ 1383 static FT_ListNode 1384 ft_list_get_node_at( FT_List list, 1385 FT_UInt index ) 1386 { 1387 FT_ListNode cur; 1388 1389 1390 if ( !list ) 1391 return NULL; 1392 1393 for ( cur = list->head; cur; cur = cur->next ) 1394 { 1395 if ( !index ) 1396 return cur; 1397 1398 index--; 1399 } 1400 1401 return NULL; 1402 } 1403 1404 1405 /*************************************************************************/ 1406 /* */ 1407 /* <Function> */ 1408 /* load_truetype_glyph */ 1409 /* */ 1410 /* <Description> */ 1411 /* Loads a given truetype glyph. Handles composites and uses a */ 1412 /* TT_Loader object. */ 1413 /* */ 1414 static FT_Error 1415 load_truetype_glyph( TT_Loader loader, 1416 FT_UInt glyph_index, 1417 FT_UInt recurse_count, 1418 FT_Bool header_only ) 1419 { 1420 FT_Error error = FT_Err_Ok; 1421 FT_Fixed x_scale, y_scale; 1422 FT_ULong offset; 1423 TT_Face face = loader->face; 1424 FT_GlyphLoader gloader = loader->gloader; 1425 FT_Bool opened_frame = 0; 1426 1427#ifdef FT_CONFIG_OPTION_INCREMENTAL 1428 FT_StreamRec inc_stream; 1429 FT_Data glyph_data; 1430 FT_Bool glyph_data_loaded = 0; 1431#endif 1432 1433 1434#ifdef FT_DEBUG_LEVEL_TRACE 1435 if ( recurse_count ) 1436 FT_TRACE5(( " nesting level: %d\n", recurse_count )); 1437#endif 1438 1439 /* some fonts have an incorrect value of `maxComponentDepth' */ 1440 if ( recurse_count > face->max_profile.maxComponentDepth ) 1441 { 1442 FT_TRACE1(( "load_truetype_glyph: maxComponentDepth set to %d\n", 1443 recurse_count )); 1444 face->max_profile.maxComponentDepth = (FT_UShort)recurse_count; 1445 } 1446 1447#ifndef FT_CONFIG_OPTION_INCREMENTAL 1448 /* check glyph index */ 1449 if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) 1450 { 1451 error = FT_THROW( Invalid_Glyph_Index ); 1452 goto Exit; 1453 } 1454#endif 1455 1456 loader->glyph_index = glyph_index; 1457 1458 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1459 { 1460 x_scale = loader->size->metrics.x_scale; 1461 y_scale = loader->size->metrics.y_scale; 1462 } 1463 else 1464 { 1465 x_scale = 0x10000L; 1466 y_scale = 0x10000L; 1467 } 1468 1469 /* Set `offset' to the start of the glyph relative to the start of */ 1470 /* the `glyf' table, and `byte_len' to the length of the glyph in */ 1471 /* bytes. */ 1472 1473#ifdef FT_CONFIG_OPTION_INCREMENTAL 1474 1475 /* If we are loading glyph data via the incremental interface, set */ 1476 /* the loader stream to a memory stream reading the data returned */ 1477 /* by the interface. */ 1478 if ( face->root.internal->incremental_interface ) 1479 { 1480 error = face->root.internal->incremental_interface->funcs->get_glyph_data( 1481 face->root.internal->incremental_interface->object, 1482 glyph_index, &glyph_data ); 1483 if ( error ) 1484 goto Exit; 1485 1486 glyph_data_loaded = 1; 1487 offset = 0; 1488 loader->byte_len = glyph_data.length; 1489 1490 FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) ); 1491 FT_Stream_OpenMemory( &inc_stream, 1492 glyph_data.pointer, 1493 (FT_ULong)glyph_data.length ); 1494 1495 loader->stream = &inc_stream; 1496 } 1497 else 1498 1499#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1500 1501 offset = tt_face_get_location( face, glyph_index, 1502 (FT_UInt*)&loader->byte_len ); 1503 1504 if ( loader->byte_len > 0 ) 1505 { 1506#ifdef FT_CONFIG_OPTION_INCREMENTAL 1507 /* for the incremental interface, `glyf_offset' is always zero */ 1508 if ( !loader->glyf_offset && 1509 !face->root.internal->incremental_interface ) 1510#else 1511 if ( !loader->glyf_offset ) 1512#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1513 { 1514 FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" )); 1515 error = FT_THROW( Invalid_Table ); 1516 goto Exit; 1517 } 1518 1519 error = face->access_glyph_frame( loader, glyph_index, 1520 loader->glyf_offset + offset, 1521 (FT_UInt)loader->byte_len ); 1522 if ( error ) 1523 goto Exit; 1524 1525 opened_frame = 1; 1526 1527 /* read glyph header first */ 1528 error = face->read_glyph_header( loader ); 1529 if ( error ) 1530 goto Exit; 1531 1532 /* the metrics must be computed after loading the glyph header */ 1533 /* since we need the glyph's `yMax' value in case the vertical */ 1534 /* metrics must be emulated */ 1535 error = tt_get_metrics( loader, glyph_index ); 1536 if ( error ) 1537 goto Exit; 1538 1539 if ( header_only ) 1540 goto Exit; 1541 } 1542 1543 if ( loader->byte_len == 0 || loader->n_contours == 0 ) 1544 { 1545 loader->bbox.xMin = 0; 1546 loader->bbox.xMax = 0; 1547 loader->bbox.yMin = 0; 1548 loader->bbox.yMax = 0; 1549 1550 error = tt_get_metrics( loader, glyph_index ); 1551 if ( error ) 1552 goto Exit; 1553 1554 if ( header_only ) 1555 goto Exit; 1556 1557 /* must initialize points before (possibly) overriding */ 1558 /* glyph metrics from the incremental interface */ 1559 tt_loader_set_pp( loader ); 1560 1561#ifdef FT_CONFIG_OPTION_INCREMENTAL 1562 tt_get_metrics_incr_overrides( loader, glyph_index ); 1563#endif 1564 1565#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1566 1567 if ( loader->face->doblend ) 1568 { 1569 /* a small outline structure with four elements for */ 1570 /* communication with `TT_Vary_Apply_Glyph_Deltas' */ 1571 FT_Vector points[4]; 1572 char tags[4] = { 1, 1, 1, 1 }; 1573 short contours[4] = { 0, 1, 2, 3 }; 1574 FT_Outline outline; 1575 1576 1577 points[0].x = loader->pp1.x; 1578 points[0].y = loader->pp1.y; 1579 points[1].x = loader->pp2.x; 1580 points[1].y = loader->pp2.y; 1581 1582 points[2].x = loader->pp3.x; 1583 points[2].y = loader->pp3.y; 1584 points[3].x = loader->pp4.x; 1585 points[3].y = loader->pp4.y; 1586 1587 outline.n_points = 4; 1588 outline.n_contours = 4; 1589 outline.points = points; 1590 outline.tags = tags; 1591 outline.contours = contours; 1592 1593 /* this must be done before scaling */ 1594 error = TT_Vary_Apply_Glyph_Deltas( loader->face, 1595 glyph_index, 1596 &outline, 1597 (FT_UInt)outline.n_points ); 1598 if ( error ) 1599 goto Exit; 1600 1601 loader->pp1.x = points[0].x; 1602 loader->pp1.y = points[0].y; 1603 loader->pp2.x = points[1].x; 1604 loader->pp2.y = points[1].y; 1605 1606 loader->pp3.x = points[2].x; 1607 loader->pp3.y = points[2].y; 1608 loader->pp4.x = points[3].x; 1609 loader->pp4.y = points[3].y; 1610 } 1611 1612#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 1613 1614 /* scale phantom points, if necessary; */ 1615 /* they get rounded in `TT_Hint_Glyph' */ 1616 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1617 { 1618 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1619 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1620 /* pp1.y and pp2.y are always zero */ 1621 1622 loader->pp3.x = FT_MulFix( loader->pp3.x, x_scale ); 1623 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1624 loader->pp4.x = FT_MulFix( loader->pp4.x, x_scale ); 1625 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1626 } 1627 1628 error = FT_Err_Ok; 1629 goto Exit; 1630 } 1631 1632 /* must initialize phantom points before (possibly) overriding */ 1633 /* glyph metrics from the incremental interface */ 1634 tt_loader_set_pp( loader ); 1635 1636#ifdef FT_CONFIG_OPTION_INCREMENTAL 1637 tt_get_metrics_incr_overrides( loader, glyph_index ); 1638#endif 1639 1640 /***********************************************************************/ 1641 /***********************************************************************/ 1642 /***********************************************************************/ 1643 1644 /* if it is a simple glyph, load it */ 1645 1646 if ( loader->n_contours > 0 ) 1647 { 1648 error = face->read_simple_glyph( loader ); 1649 if ( error ) 1650 goto Exit; 1651 1652 /* all data have been read */ 1653 face->forget_glyph_frame( loader ); 1654 opened_frame = 0; 1655 1656 error = TT_Process_Simple_Glyph( loader ); 1657 if ( error ) 1658 goto Exit; 1659 1660 FT_GlyphLoader_Add( gloader ); 1661 } 1662 1663 /***********************************************************************/ 1664 /***********************************************************************/ 1665 /***********************************************************************/ 1666 1667 /* otherwise, load a composite! */ 1668 else if ( loader->n_contours == -1 ) 1669 { 1670 FT_Memory memory = face->root.memory; 1671 1672 FT_UInt start_point; 1673 FT_UInt start_contour; 1674 FT_ULong ins_pos; /* position of composite instructions, if any */ 1675 1676 FT_ListNode node, node2; 1677 1678 1679 /* 1680 * We store the glyph index directly in the `node->data' pointer, 1681 * following the glib solution (cf. macro `GUINT_TO_POINTER') with a 1682 * double cast to make this portable. Note, however, that this needs 1683 * pointers with a width of at least 32 bits. 1684 */ 1685 1686 1687 /* clear the nodes filled by sibling chains */ 1688 node = ft_list_get_node_at( &loader->composites, recurse_count ); 1689 for ( node2 = node; node2; node2 = node2->next ) 1690 node2->data = (void*)ULONG_MAX; 1691 1692 /* check whether we already have a composite glyph with this index */ 1693 if ( FT_List_Find( &loader->composites, 1694 (void*)(unsigned long)glyph_index ) ) 1695 { 1696 FT_TRACE1(( "TT_Load_Composite_Glyph:" 1697 " infinite recursion detected\n" )); 1698 error = FT_THROW( Invalid_Composite ); 1699 goto Exit; 1700 } 1701 1702 else if ( node ) 1703 node->data = (void*)(unsigned long)glyph_index; 1704 1705 else 1706 { 1707 if ( FT_NEW( node ) ) 1708 goto Exit; 1709 node->data = (void*)(unsigned long)glyph_index; 1710 FT_List_Add( &loader->composites, node ); 1711 } 1712 1713 start_point = (FT_UInt)gloader->base.outline.n_points; 1714 start_contour = (FT_UInt)gloader->base.outline.n_contours; 1715 1716 /* for each subglyph, read composite header */ 1717 error = face->read_composite_glyph( loader ); 1718 if ( error ) 1719 goto Exit; 1720 1721 /* store the offset of instructions */ 1722 ins_pos = loader->ins_pos; 1723 1724 /* all data we need are read */ 1725 face->forget_glyph_frame( loader ); 1726 opened_frame = 0; 1727 1728#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1729 1730 if ( face->doblend ) 1731 { 1732 short i, limit; 1733 FT_SubGlyph subglyph; 1734 1735 FT_Outline outline; 1736 FT_Vector* points = NULL; 1737 char* tags = NULL; 1738 short* contours = NULL; 1739 1740 1741 limit = (short)gloader->current.num_subglyphs; 1742 1743 /* construct an outline structure for */ 1744 /* communication with `TT_Vary_Apply_Glyph_Deltas' */ 1745 outline.n_points = (short)( gloader->current.num_subglyphs + 4 ); 1746 outline.n_contours = outline.n_points; 1747 1748 outline.points = NULL; 1749 outline.tags = NULL; 1750 outline.contours = NULL; 1751 1752 if ( FT_NEW_ARRAY( points, outline.n_points ) || 1753 FT_NEW_ARRAY( tags, outline.n_points ) || 1754 FT_NEW_ARRAY( contours, outline.n_points ) ) 1755 goto Exit1; 1756 1757 subglyph = gloader->current.subglyphs; 1758 1759 for ( i = 0; i < limit; i++, subglyph++ ) 1760 { 1761 /* applying deltas for anchor points doesn't make sense, */ 1762 /* but we don't have to specially check this since */ 1763 /* unused delta values are zero anyways */ 1764 points[i].x = subglyph->arg1; 1765 points[i].y = subglyph->arg2; 1766 tags[i] = 1; 1767 contours[i] = i; 1768 } 1769 1770 points[i].x = loader->pp1.x; 1771 points[i].y = loader->pp1.y; 1772 tags[i] = 1; 1773 contours[i] = i; 1774 1775 i++; 1776 points[i].x = loader->pp2.x; 1777 points[i].y = loader->pp2.y; 1778 tags[i] = 1; 1779 contours[i] = i; 1780 1781 i++; 1782 points[i].x = loader->pp3.x; 1783 points[i].y = loader->pp3.y; 1784 tags[i] = 1; 1785 contours[i] = i; 1786 1787 i++; 1788 points[i].x = loader->pp4.x; 1789 points[i].y = loader->pp4.y; 1790 tags[i] = 1; 1791 contours[i] = i; 1792 1793 outline.points = points; 1794 outline.tags = tags; 1795 outline.contours = contours; 1796 1797 /* this call provides additional offsets */ 1798 /* for each component's translation */ 1799 if ( ( error = TT_Vary_Apply_Glyph_Deltas( 1800 face, 1801 glyph_index, 1802 &outline, 1803 (FT_UInt)outline.n_points ) ) != 0 ) 1804 goto Exit1; 1805 1806 subglyph = gloader->current.subglyphs; 1807 1808 for ( i = 0; i < limit; i++, subglyph++ ) 1809 { 1810 if ( subglyph->flags & ARGS_ARE_XY_VALUES ) 1811 { 1812 subglyph->arg1 = (FT_Int16)points[i].x; 1813 subglyph->arg2 = (FT_Int16)points[i].y; 1814 } 1815 } 1816 1817 loader->pp1.x = points[i + 0].x; 1818 loader->pp1.y = points[i + 0].y; 1819 loader->pp2.x = points[i + 1].x; 1820 loader->pp2.y = points[i + 1].y; 1821 1822 loader->pp3.x = points[i + 2].x; 1823 loader->pp3.y = points[i + 2].y; 1824 loader->pp4.x = points[i + 3].x; 1825 loader->pp4.y = points[i + 3].y; 1826 1827 Exit1: 1828 FT_FREE( outline.points ); 1829 FT_FREE( outline.tags ); 1830 FT_FREE( outline.contours ); 1831 1832 if ( error ) 1833 goto Exit; 1834 } 1835 1836#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 1837 1838 /* scale phantom points, if necessary; */ 1839 /* they get rounded in `TT_Hint_Glyph' */ 1840 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1841 { 1842 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1843 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1844 /* pp1.y and pp2.y are always zero */ 1845 1846 loader->pp3.x = FT_MulFix( loader->pp3.x, x_scale ); 1847 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1848 loader->pp4.x = FT_MulFix( loader->pp4.x, x_scale ); 1849 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1850 } 1851 1852 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ 1853 /* `as is' in the glyph slot (the client application will be */ 1854 /* responsible for interpreting these data)... */ 1855 if ( loader->load_flags & FT_LOAD_NO_RECURSE ) 1856 { 1857 FT_GlyphLoader_Add( gloader ); 1858 loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE; 1859 1860 goto Exit; 1861 } 1862 1863 /*********************************************************************/ 1864 /*********************************************************************/ 1865 /*********************************************************************/ 1866 1867 { 1868 FT_UInt n, num_base_points; 1869 FT_SubGlyph subglyph = NULL; 1870 1871 FT_UInt num_points = start_point; 1872 FT_UInt num_subglyphs = gloader->current.num_subglyphs; 1873 FT_UInt num_base_subgs = gloader->base.num_subglyphs; 1874 1875 FT_Stream old_stream = loader->stream; 1876 FT_Int old_byte_len = loader->byte_len; 1877 1878 1879 FT_GlyphLoader_Add( gloader ); 1880 1881 /* read each subglyph independently */ 1882 for ( n = 0; n < num_subglyphs; n++ ) 1883 { 1884 FT_Vector pp[4]; 1885 1886 1887 /* Each time we call load_truetype_glyph in this loop, the */ 1888 /* value of `gloader.base.subglyphs' can change due to table */ 1889 /* reallocations. We thus need to recompute the subglyph */ 1890 /* pointer on each iteration. */ 1891 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1892 1893 pp[0] = loader->pp1; 1894 pp[1] = loader->pp2; 1895 pp[2] = loader->pp3; 1896 pp[3] = loader->pp4; 1897 1898 num_base_points = (FT_UInt)gloader->base.outline.n_points; 1899 1900 error = load_truetype_glyph( loader, 1901 (FT_UInt)subglyph->index, 1902 recurse_count + 1, 1903 FALSE ); 1904 if ( error ) 1905 goto Exit; 1906 1907 /* restore subglyph pointer */ 1908 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1909 1910 /* restore phantom points if necessary */ 1911 if ( !( subglyph->flags & USE_MY_METRICS ) ) 1912 { 1913 loader->pp1 = pp[0]; 1914 loader->pp2 = pp[1]; 1915 loader->pp3 = pp[2]; 1916 loader->pp4 = pp[3]; 1917 } 1918 1919 num_points = (FT_UInt)gloader->base.outline.n_points; 1920 1921 if ( num_points == num_base_points ) 1922 continue; 1923 1924 /* gloader->base.outline consists of three parts: */ 1925 /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */ 1926 /* */ 1927 /* (1): exists from the beginning */ 1928 /* (2): components that have been loaded so far */ 1929 /* (3): the newly loaded component */ 1930 error = TT_Process_Composite_Component( loader, 1931 subglyph, 1932 start_point, 1933 num_base_points ); 1934 if ( error ) 1935 goto Exit; 1936 } 1937 1938 loader->stream = old_stream; 1939 loader->byte_len = old_byte_len; 1940 1941 /* process the glyph */ 1942 loader->ins_pos = ins_pos; 1943 if ( IS_HINTED( loader->load_flags ) && 1944#ifdef TT_USE_BYTECODE_INTERPRETER 1945 subglyph->flags & WE_HAVE_INSTR && 1946#endif 1947 num_points > start_point ) 1948 { 1949 error = TT_Process_Composite_Glyph( loader, 1950 start_point, 1951 start_contour ); 1952 if ( error ) 1953 goto Exit; 1954 } 1955 } 1956 } 1957 else 1958 { 1959 /* invalid composite count (negative but not -1) */ 1960 error = FT_THROW( Invalid_Outline ); 1961 goto Exit; 1962 } 1963 1964 /***********************************************************************/ 1965 /***********************************************************************/ 1966 /***********************************************************************/ 1967 1968 Exit: 1969 1970 if ( opened_frame ) 1971 face->forget_glyph_frame( loader ); 1972 1973#ifdef FT_CONFIG_OPTION_INCREMENTAL 1974 1975 if ( glyph_data_loaded ) 1976 face->root.internal->incremental_interface->funcs->free_glyph_data( 1977 face->root.internal->incremental_interface->object, 1978 &glyph_data ); 1979 1980#endif 1981 1982 return error; 1983 } 1984 1985 1986 static FT_Error 1987 compute_glyph_metrics( TT_Loader loader, 1988 FT_UInt glyph_index ) 1989 { 1990 TT_Face face = loader->face; 1991#if defined TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY || \ 1992 defined TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 1993 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); 1994#endif 1995 1996 FT_BBox bbox; 1997 FT_Fixed y_scale; 1998 TT_GlyphSlot glyph = loader->glyph; 1999 TT_Size size = loader->size; 2000 2001 2002 y_scale = 0x10000L; 2003 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 2004 y_scale = size->root.metrics.y_scale; 2005 2006 if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE ) 2007 FT_Outline_Get_CBox( &glyph->outline, &bbox ); 2008 else 2009 bbox = loader->bbox; 2010 2011 /* get the device-independent horizontal advance; it is scaled later */ 2012 /* by the base layer. */ 2013 glyph->linearHoriAdvance = loader->linear; 2014 2015 glyph->metrics.horiBearingX = bbox.xMin; 2016 glyph->metrics.horiBearingY = bbox.yMax; 2017 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; 2018 2019 /* Adjust advance width to the value contained in the hdmx table */ 2020 /* unless FT_LOAD_COMPUTE_METRICS is set or backwards compatibility */ 2021 /* mode of the v40 interpreter is active. See `ttinterp.h' for */ 2022 /* details on backwards compatibility mode. */ 2023 if ( 2024#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 2025 !( driver->interpreter_version == TT_INTERPRETER_VERSION_40 && 2026 ( loader->exec && loader->exec->backwards_compatibility ) ) && 2027#endif 2028 !face->postscript.isFixedPitch && 2029 IS_HINTED( loader->load_flags ) && 2030 !( loader->load_flags & FT_LOAD_COMPUTE_METRICS ) ) 2031 { 2032 FT_Byte* widthp; 2033 2034 2035 widthp = tt_face_get_device_metrics( face, 2036 size->root.metrics.x_ppem, 2037 glyph_index ); 2038 2039#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 2040 2041 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 2042 { 2043 FT_Bool ignore_x_mode; 2044 2045 2046 ignore_x_mode = FT_BOOL( FT_LOAD_TARGET_MODE( loader->load_flags ) != 2047 FT_RENDER_MODE_MONO ); 2048 2049 if ( widthp && 2050 ( ( ignore_x_mode && loader->exec->compatible_widths ) || 2051 !ignore_x_mode || 2052 SPH_OPTION_BITMAP_WIDTHS ) ) 2053 glyph->metrics.horiAdvance = *widthp * 64; 2054 } 2055 else 2056 2057#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */ 2058 2059 { 2060 if ( widthp ) 2061 glyph->metrics.horiAdvance = *widthp * 64; 2062 } 2063 } 2064 2065 /* set glyph dimensions */ 2066 glyph->metrics.width = bbox.xMax - bbox.xMin; 2067 glyph->metrics.height = bbox.yMax - bbox.yMin; 2068 2069 /* Now take care of vertical metrics. In the case where there is */ 2070 /* no vertical information within the font (relatively common), */ 2071 /* create some metrics manually */ 2072 { 2073 FT_Pos top; /* scaled vertical top side bearing */ 2074 FT_Pos advance; /* scaled vertical advance height */ 2075 2076 2077 /* Get the unscaled top bearing and advance height. */ 2078 if ( face->vertical_info && 2079 face->vertical.number_Of_VMetrics > 0 ) 2080 { 2081 top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax, 2082 y_scale ); 2083 2084 if ( loader->pp3.y <= loader->pp4.y ) 2085 advance = 0; 2086 else 2087 advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y, 2088 y_scale ); 2089 } 2090 else 2091 { 2092 FT_Pos height; 2093 2094 2095 /* XXX Compute top side bearing and advance height in */ 2096 /* Get_VMetrics instead of here. */ 2097 2098 /* NOTE: The OS/2 values are the only `portable' ones, */ 2099 /* which is why we use them, if there is an OS/2 */ 2100 /* table in the font. Otherwise, we use the */ 2101 /* values defined in the horizontal header. */ 2102 2103 height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin, 2104 y_scale ); 2105 if ( face->os2.version != 0xFFFFU ) 2106 advance = (FT_Pos)( face->os2.sTypoAscender - 2107 face->os2.sTypoDescender ); 2108 else 2109 advance = (FT_Pos)( face->horizontal.Ascender - 2110 face->horizontal.Descender ); 2111 2112 top = ( advance - height ) / 2; 2113 } 2114 2115#ifdef FT_CONFIG_OPTION_INCREMENTAL 2116 { 2117 FT_Incremental_InterfaceRec* incr; 2118 FT_Incremental_MetricsRec metrics; 2119 FT_Error error; 2120 2121 2122 incr = face->root.internal->incremental_interface; 2123 2124 /* If this is an incrementally loaded font see if there are */ 2125 /* overriding metrics for this glyph. */ 2126 if ( incr && incr->funcs->get_glyph_metrics ) 2127 { 2128 metrics.bearing_x = 0; 2129 metrics.bearing_y = top; 2130 metrics.advance = advance; 2131 2132 error = incr->funcs->get_glyph_metrics( incr->object, 2133 glyph_index, 2134 TRUE, 2135 &metrics ); 2136 if ( error ) 2137 return error; 2138 2139 top = metrics.bearing_y; 2140 advance = metrics.advance; 2141 } 2142 } 2143 2144 /* GWW: Do vertical metrics get loaded incrementally too? */ 2145 2146#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 2147 2148 glyph->linearVertAdvance = advance; 2149 2150 /* scale the metrics */ 2151 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 2152 { 2153 top = FT_MulFix( top, y_scale ); 2154 advance = FT_MulFix( advance, y_scale ); 2155 } 2156 2157 /* XXX: for now, we have no better algorithm for the lsb, but it */ 2158 /* should work fine. */ 2159 /* */ 2160 glyph->metrics.vertBearingX = glyph->metrics.horiBearingX - 2161 glyph->metrics.horiAdvance / 2; 2162 glyph->metrics.vertBearingY = top; 2163 glyph->metrics.vertAdvance = advance; 2164 } 2165 2166 return 0; 2167 } 2168 2169 2170#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 2171 2172 static FT_Error 2173 load_sbit_image( TT_Size size, 2174 TT_GlyphSlot glyph, 2175 FT_UInt glyph_index, 2176 FT_Int32 load_flags ) 2177 { 2178 TT_Face face; 2179 SFNT_Service sfnt; 2180 FT_Stream stream; 2181 FT_Error error; 2182 TT_SBit_MetricsRec metrics; 2183 2184 2185 face = (TT_Face)glyph->face; 2186 sfnt = (SFNT_Service)face->sfnt; 2187 stream = face->root.stream; 2188 2189 error = sfnt->load_sbit_image( face, 2190 size->strike_index, 2191 glyph_index, 2192 (FT_UInt)load_flags, 2193 stream, 2194 &glyph->bitmap, 2195 &metrics ); 2196 if ( !error ) 2197 { 2198 glyph->outline.n_points = 0; 2199 glyph->outline.n_contours = 0; 2200 2201 glyph->metrics.width = (FT_Pos)metrics.width * 64; 2202 glyph->metrics.height = (FT_Pos)metrics.height * 64; 2203 2204 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX * 64; 2205 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY * 64; 2206 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance * 64; 2207 2208 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX * 64; 2209 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY * 64; 2210 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance * 64; 2211 2212 glyph->format = FT_GLYPH_FORMAT_BITMAP; 2213 2214 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 2215 { 2216 glyph->bitmap_left = metrics.vertBearingX; 2217 glyph->bitmap_top = metrics.vertBearingY; 2218 } 2219 else 2220 { 2221 glyph->bitmap_left = metrics.horiBearingX; 2222 glyph->bitmap_top = metrics.horiBearingY; 2223 } 2224 } 2225 2226 return error; 2227 } 2228 2229#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 2230 2231 2232 static FT_Error 2233 tt_loader_init( TT_Loader loader, 2234 TT_Size size, 2235 TT_GlyphSlot glyph, 2236 FT_Int32 load_flags, 2237 FT_Bool glyf_table_only ) 2238 { 2239 FT_Error error; 2240 2241 TT_Face face; 2242 FT_Stream stream; 2243#ifdef TT_USE_BYTECODE_INTERPRETER 2244 FT_Bool pedantic = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); 2245#endif 2246#if defined TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY || \ 2247 defined TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 2248 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( (TT_Face)glyph->face ); 2249#endif 2250 2251 2252 face = (TT_Face)glyph->face; 2253 stream = face->root.stream; 2254 2255 FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) ); 2256 2257#ifdef TT_USE_BYTECODE_INTERPRETER 2258 2259 /* load execution context */ 2260 if ( IS_HINTED( load_flags ) && !glyf_table_only ) 2261 { 2262 TT_ExecContext exec; 2263 FT_Bool grayscale = TRUE; 2264#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 2265 FT_Bool subpixel_hinting_lean; 2266 FT_Bool grayscale_cleartype; 2267#endif 2268 2269#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 2270 FT_Bool subpixel_hinting = FALSE; 2271 2272#if 0 2273 /* not used yet */ 2274 FT_Bool compatible_widths; 2275 FT_Bool symmetrical_smoothing; 2276 FT_Bool bgr; 2277 FT_Bool vertical_lcd; 2278 FT_Bool subpixel_positioned; 2279 FT_Bool gray_cleartype; 2280#endif 2281#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */ 2282 2283 FT_Bool reexecute = FALSE; 2284 2285 2286 if ( size->bytecode_ready < 0 || size->cvt_ready < 0 ) 2287 { 2288 error = tt_size_ready_bytecode( size, pedantic ); 2289 if ( error ) 2290 return error; 2291 } 2292 else if ( size->bytecode_ready ) 2293 return size->bytecode_ready; 2294 else if ( size->cvt_ready ) 2295 return size->cvt_ready; 2296 2297 /* query new execution context */ 2298 exec = size->context; 2299 if ( !exec ) 2300 return FT_THROW( Could_Not_Find_Context ); 2301 2302#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 2303 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_40 ) 2304 { 2305 subpixel_hinting_lean = TRUE; 2306 grayscale_cleartype = !FT_BOOL( load_flags & 2307 FT_LOAD_TARGET_LCD || 2308 load_flags & 2309 FT_LOAD_TARGET_LCD_V ); 2310 exec->vertical_lcd_lean = FT_BOOL( load_flags & 2311 FT_LOAD_TARGET_LCD_V ); 2312 } 2313 else 2314 { 2315 subpixel_hinting_lean = FALSE; 2316 grayscale_cleartype = FALSE; 2317 exec->vertical_lcd_lean = FALSE; 2318 } 2319#endif 2320 2321#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 2322 2323 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 2324 { 2325 subpixel_hinting = FT_BOOL( ( FT_LOAD_TARGET_MODE( load_flags ) != 2326 FT_RENDER_MODE_MONO ) && 2327 SPH_OPTION_SET_SUBPIXEL ); 2328 2329 if ( subpixel_hinting ) 2330 grayscale = FALSE; 2331 else if ( SPH_OPTION_SET_GRAYSCALE ) 2332 { 2333 grayscale = TRUE; 2334 subpixel_hinting = FALSE; 2335 } 2336 else 2337 grayscale = FALSE; 2338 2339 if ( FT_IS_TRICKY( glyph->face ) ) 2340 subpixel_hinting = FALSE; 2341 2342 exec->ignore_x_mode = subpixel_hinting || grayscale; 2343 exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; 2344 if ( exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 ) 2345 exec->rasterizer_version = TT_INTERPRETER_VERSION_35; 2346 2347#if 1 2348 exec->compatible_widths = SPH_OPTION_SET_COMPATIBLE_WIDTHS; 2349 exec->symmetrical_smoothing = TRUE; 2350 exec->bgr = FALSE; 2351 exec->vertical_lcd = FALSE; 2352 exec->subpixel_positioned = TRUE; 2353 exec->gray_cleartype = FALSE; 2354#else /* 0 */ 2355 exec->compatible_widths = 2356 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2357 TT_LOAD_COMPATIBLE_WIDTHS ); 2358 exec->symmetrical_smoothing = 2359 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2360 TT_LOAD_SYMMETRICAL_SMOOTHING ); 2361 exec->bgr = 2362 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2363 TT_LOAD_BGR ); 2364 exec->vertical_lcd = 2365 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2366 TT_LOAD_VERTICAL_LCD ); 2367 exec->subpixel_positioned = 2368 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2369 TT_LOAD_SUBPIXEL_POSITIONED ); 2370 exec->gray_cleartype = 2371 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2372 TT_LOAD_GRAY_CLEARTYPE ); 2373#endif /* 0 */ 2374 2375 } 2376 else 2377 2378#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */ 2379 2380#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 2381 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_40 ) 2382 grayscale = FT_BOOL( !subpixel_hinting_lean && 2383 FT_LOAD_TARGET_MODE( load_flags ) != 2384 FT_RENDER_MODE_MONO ); 2385 else 2386#endif 2387 grayscale = FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2388 FT_RENDER_MODE_MONO ); 2389 2390 error = TT_Load_Context( exec, face, size ); 2391 if ( error ) 2392 return error; 2393 2394#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 2395 2396 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 2397 { 2398 /* a change from mono to subpixel rendering (and vice versa) */ 2399 /* requires a re-execution of the CVT program */ 2400 if ( subpixel_hinting != exec->subpixel_hinting ) 2401 { 2402 FT_TRACE4(( "tt_loader_init: subpixel hinting change," 2403 " re-executing `prep' table\n" )); 2404 2405 exec->subpixel_hinting = subpixel_hinting; 2406 reexecute = TRUE; 2407 } 2408 2409 /* a change from mono to grayscale rendering (and vice versa) */ 2410 /* requires a re-execution of the CVT program */ 2411 if ( grayscale != exec->grayscale ) 2412 { 2413 FT_TRACE4(( "tt_loader_init: grayscale hinting change," 2414 " re-executing `prep' table\n" )); 2415 2416 exec->grayscale = grayscale; 2417 reexecute = TRUE; 2418 } 2419 } 2420 else 2421 2422#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */ 2423 2424 { 2425 2426#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL 2427 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_40 ) 2428 { 2429 /* a change from mono to subpixel rendering (and vice versa) */ 2430 /* requires a re-execution of the CVT program */ 2431 if ( subpixel_hinting_lean != exec->subpixel_hinting_lean ) 2432 { 2433 FT_TRACE4(( "tt_loader_init: subpixel hinting change," 2434 " re-executing `prep' table\n" )); 2435 2436 exec->subpixel_hinting_lean = subpixel_hinting_lean; 2437 reexecute = TRUE; 2438 } 2439 2440 /* a change from colored to grayscale subpixel rendering (and */ 2441 /* vice versa) requires a re-execution of the CVT program */ 2442 if ( grayscale_cleartype != exec->grayscale_cleartype ) 2443 { 2444 FT_TRACE4(( "tt_loader_init: grayscale subpixel hinting change," 2445 " re-executing `prep' table\n" )); 2446 2447 exec->grayscale_cleartype = grayscale_cleartype; 2448 reexecute = TRUE; 2449 } 2450 } 2451#endif 2452 2453 /* a change from mono to grayscale rendering (and vice versa) */ 2454 /* requires a re-execution of the CVT program */ 2455 if ( grayscale != exec->grayscale ) 2456 { 2457 FT_TRACE4(( "tt_loader_init: grayscale hinting change," 2458 " re-executing `prep' table\n" )); 2459 2460 exec->grayscale = grayscale; 2461 reexecute = TRUE; 2462 } 2463 } 2464 2465 if ( reexecute ) 2466 { 2467 FT_UInt i; 2468 2469 2470 for ( i = 0; i < size->cvt_size; i++ ) 2471 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); 2472 error = tt_size_run_prep( size, pedantic ); 2473 if ( error ) 2474 return error; 2475 } 2476 2477 /* check whether the cvt program has disabled hinting */ 2478 if ( exec->GS.instruct_control & 1 ) 2479 load_flags |= FT_LOAD_NO_HINTING; 2480 2481 /* load default graphics state -- if needed */ 2482 if ( exec->GS.instruct_control & 2 ) 2483 exec->GS = tt_default_graphics_state; 2484 2485#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY 2486 /* check whether we have a font hinted for ClearType -- */ 2487 /* note that this flag can also be modified in a glyph's bytecode */ 2488 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 && 2489 exec->GS.instruct_control & 4 ) 2490 exec->ignore_x_mode = 0; 2491#endif 2492 2493 exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); 2494 loader->exec = exec; 2495 loader->instructions = exec->glyphIns; 2496 } 2497 2498#endif /* TT_USE_BYTECODE_INTERPRETER */ 2499 2500 /* seek to the beginning of the glyph table -- for Type 42 fonts */ 2501 /* the table might be accessed from a Postscript stream or something */ 2502 /* else... */ 2503 2504#ifdef FT_CONFIG_OPTION_INCREMENTAL 2505 2506 if ( face->root.internal->incremental_interface ) 2507 loader->glyf_offset = 0; 2508 else 2509 2510#endif 2511 2512 { 2513 error = face->goto_table( face, TTAG_glyf, stream, 0 ); 2514 2515 if ( FT_ERR_EQ( error, Table_Missing ) ) 2516 loader->glyf_offset = 0; 2517 else if ( error ) 2518 { 2519 FT_ERROR(( "tt_loader_init: could not access glyph table\n" )); 2520 return error; 2521 } 2522 else 2523 loader->glyf_offset = FT_STREAM_POS(); 2524 } 2525 2526 /* get face's glyph loader */ 2527 if ( !glyf_table_only ) 2528 { 2529 FT_GlyphLoader gloader = glyph->internal->loader; 2530 2531 2532 FT_GlyphLoader_Rewind( gloader ); 2533 loader->gloader = gloader; 2534 } 2535 2536 loader->load_flags = (FT_ULong)load_flags; 2537 2538 loader->face = face; 2539 loader->size = size; 2540 loader->glyph = (FT_GlyphSlot)glyph; 2541 loader->stream = stream; 2542 2543 loader->composites.head = NULL; 2544 loader->composites.tail = NULL; 2545 2546 return FT_Err_Ok; 2547 } 2548 2549 2550 static void 2551 tt_loader_done( TT_Loader loader ) 2552 { 2553 FT_List_Finalize( &loader->composites, 2554 NULL, 2555 loader->face->root.memory, 2556 NULL ); 2557 } 2558 2559 2560 /*************************************************************************/ 2561 /* */ 2562 /* <Function> */ 2563 /* TT_Load_Glyph */ 2564 /* */ 2565 /* <Description> */ 2566 /* A function used to load a single glyph within a given glyph slot, */ 2567 /* for a given size. */ 2568 /* */ 2569 /* <Input> */ 2570 /* glyph :: A handle to a target slot object where the glyph */ 2571 /* will be loaded. */ 2572 /* */ 2573 /* size :: A handle to the source face size at which the glyph */ 2574 /* must be scaled/loaded. */ 2575 /* */ 2576 /* glyph_index :: The index of the glyph in the font file. */ 2577 /* */ 2578 /* load_flags :: A flag indicating what to load for this glyph. The */ 2579 /* FT_LOAD_XXX constants can be used to control the */ 2580 /* glyph loading process (e.g., whether the outline */ 2581 /* should be scaled, whether to load bitmaps or not, */ 2582 /* whether to hint the outline, etc). */ 2583 /* */ 2584 /* <Return> */ 2585 /* FreeType error code. 0 means success. */ 2586 /* */ 2587 FT_LOCAL_DEF( FT_Error ) 2588 TT_Load_Glyph( TT_Size size, 2589 TT_GlyphSlot glyph, 2590 FT_UInt glyph_index, 2591 FT_Int32 load_flags ) 2592 { 2593 FT_Error error; 2594 TT_LoaderRec loader; 2595 2596 2597 FT_TRACE1(( "TT_Load_Glyph: glyph index %d\n", glyph_index )); 2598 2599#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 2600 2601 /* try to load embedded bitmap if any */ 2602 /* */ 2603 /* XXX: The convention should be emphasized in */ 2604 /* the documents because it can be confusing. */ 2605 if ( size->strike_index != 0xFFFFFFFFUL && 2606 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 2607 { 2608 error = load_sbit_image( size, glyph, glyph_index, load_flags ); 2609 if ( !error ) 2610 { 2611 if ( FT_IS_SCALABLE( glyph->face ) ) 2612 { 2613 /* for the bbox we need the header only */ 2614 (void)tt_loader_init( &loader, size, glyph, load_flags, TRUE ); 2615 (void)load_truetype_glyph( &loader, glyph_index, 0, TRUE ); 2616 tt_loader_done( &loader ); 2617 glyph->linearHoriAdvance = loader.linear; 2618 glyph->linearVertAdvance = loader.vadvance; 2619 2620 /* sanity checks: if `xxxAdvance' in the sbit metric */ 2621 /* structure isn't set, use `linearXXXAdvance' */ 2622 if ( !glyph->metrics.horiAdvance && glyph->linearHoriAdvance ) 2623 glyph->metrics.horiAdvance = 2624 FT_MulFix( glyph->linearHoriAdvance, 2625 size->root.metrics.x_scale ); 2626 if ( !glyph->metrics.vertAdvance && glyph->linearVertAdvance ) 2627 glyph->metrics.vertAdvance = 2628 FT_MulFix( glyph->linearVertAdvance, 2629 size->root.metrics.y_scale ); 2630 } 2631 2632 return FT_Err_Ok; 2633 } 2634 } 2635 2636#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 2637 2638 /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */ 2639 if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid ) 2640 return FT_THROW( Invalid_Size_Handle ); 2641 2642 if ( load_flags & FT_LOAD_SBITS_ONLY ) 2643 return FT_THROW( Invalid_Argument ); 2644 2645 error = tt_loader_init( &loader, size, glyph, load_flags, FALSE ); 2646 if ( error ) 2647 return error; 2648 2649 glyph->format = FT_GLYPH_FORMAT_OUTLINE; 2650 glyph->num_subglyphs = 0; 2651 glyph->outline.flags = 0; 2652 2653 /* main loading loop */ 2654 error = load_truetype_glyph( &loader, glyph_index, 0, FALSE ); 2655 if ( !error ) 2656 { 2657 if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE ) 2658 { 2659 glyph->num_subglyphs = loader.gloader->base.num_subglyphs; 2660 glyph->subglyphs = loader.gloader->base.subglyphs; 2661 } 2662 else 2663 { 2664 glyph->outline = loader.gloader->base.outline; 2665 glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS; 2666 2667 /* Translate array so that (0,0) is the glyph's origin. Note */ 2668 /* that this behaviour is independent on the value of bit 1 of */ 2669 /* the `flags' field in the `head' table -- at least major */ 2670 /* applications like Acroread indicate that. */ 2671 if ( loader.pp1.x ) 2672 FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 ); 2673 } 2674 2675#ifdef TT_USE_BYTECODE_INTERPRETER 2676 2677 if ( IS_HINTED( load_flags ) ) 2678 { 2679 if ( loader.exec->GS.scan_control ) 2680 { 2681 /* convert scan conversion mode to FT_OUTLINE_XXX flags */ 2682 switch ( loader.exec->GS.scan_type ) 2683 { 2684 case 0: /* simple drop-outs including stubs */ 2685 glyph->outline.flags |= FT_OUTLINE_INCLUDE_STUBS; 2686 break; 2687 case 1: /* simple drop-outs excluding stubs */ 2688 /* nothing; it's the default rendering mode */ 2689 break; 2690 case 4: /* smart drop-outs including stubs */ 2691 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS | 2692 FT_OUTLINE_INCLUDE_STUBS; 2693 break; 2694 case 5: /* smart drop-outs excluding stubs */ 2695 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS; 2696 break; 2697 2698 default: /* no drop-out control */ 2699 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; 2700 break; 2701 } 2702 } 2703 else 2704 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; 2705 } 2706 2707#endif /* TT_USE_BYTECODE_INTERPRETER */ 2708 2709 error = compute_glyph_metrics( &loader, glyph_index ); 2710 } 2711 2712 tt_loader_done( &loader ); 2713 2714 /* Set the `high precision' bit flag. */ 2715 /* This is _critical_ to get correct output for monochrome */ 2716 /* TrueType glyphs at all sizes using the bytecode interpreter. */ 2717 /* */ 2718 if ( !( load_flags & FT_LOAD_NO_SCALE ) && 2719 size->root.metrics.y_ppem < 24 ) 2720 glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; 2721 2722 return error; 2723 } 2724 2725 2726/* END */ 2727