ttgload.c revision 64872a50165d842d72c520f5f7e19124dbf7822d
1/***************************************************************************/ 2/* */ 3/* ttgload.c */ 4/* */ 5/* TrueType Glyph Loader (body). */ 6/* */ 7/* Copyright 1996-2013 */ 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 28#include "ttgload.h" 29#include "ttpload.h" 30 31#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 32#include "ttgxvar.h" 33#endif 34 35#include "tterrors.h" 36#include "ttsubpix.h" 37 38 39 /*************************************************************************/ 40 /* */ 41 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 42 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 43 /* messages during execution. */ 44 /* */ 45#undef FT_COMPONENT 46#define FT_COMPONENT trace_ttgload 47 48 49 /*************************************************************************/ 50 /* */ 51 /* Composite glyph flags. */ 52 /* */ 53#define ARGS_ARE_WORDS 0x0001 54#define ARGS_ARE_XY_VALUES 0x0002 55#define ROUND_XY_TO_GRID 0x0004 56#define WE_HAVE_A_SCALE 0x0008 57/* reserved 0x0010 */ 58#define MORE_COMPONENTS 0x0020 59#define WE_HAVE_AN_XY_SCALE 0x0040 60#define WE_HAVE_A_2X2 0x0080 61#define WE_HAVE_INSTR 0x0100 62#define USE_MY_METRICS 0x0200 63#define OVERLAP_COMPOUND 0x0400 64#define SCALED_COMPONENT_OFFSET 0x0800 65#define UNSCALED_COMPONENT_OFFSET 0x1000 66 67 68 /*************************************************************************/ 69 /* */ 70 /* Return the horizontal metrics in font units for a given glyph. */ 71 /* */ 72 FT_LOCAL_DEF( void ) 73 TT_Get_HMetrics( TT_Face face, 74 FT_UInt idx, 75 FT_Short* lsb, 76 FT_UShort* aw ) 77 { 78 ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw ); 79 80 FT_TRACE5(( " advance width (font units): %d\n", *aw )); 81 FT_TRACE5(( " left side bearing (font units): %d\n", *lsb )); 82 } 83 84 85 /*************************************************************************/ 86 /* */ 87 /* Return the vertical metrics in font units for a given glyph. */ 88 /* See macro `TT_LOADER_SET_PP' below for explanations. */ 89 /* */ 90 FT_LOCAL_DEF( void ) 91 TT_Get_VMetrics( TT_Face face, 92 FT_UInt idx, 93 FT_Pos yMax, 94 FT_Short* tsb, 95 FT_UShort* ah ) 96 { 97 if ( face->vertical_info ) 98 ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah ); 99 100 else if ( face->os2.version != 0xFFFFU ) 101 { 102 *tsb = face->os2.sTypoAscender - yMax; 103 *ah = face->os2.sTypoAscender - face->os2.sTypoDescender; 104 } 105 106 else 107 { 108 *tsb = face->horizontal.Ascender - yMax; 109 *ah = face->horizontal.Ascender - face->horizontal.Descender; 110 } 111 112 FT_TRACE5(( " advance height (font units): %d\n", *ah )); 113 FT_TRACE5(( " top side bearing (font units): %d\n", *tsb )); 114 } 115 116 117 static FT_Error 118 tt_get_metrics( TT_Loader loader, 119 FT_UInt glyph_index ) 120 { 121 TT_Face face = (TT_Face)loader->face; 122#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 123 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); 124#endif 125 126 FT_Error error; 127 FT_Stream stream = loader->stream; 128 129 FT_Short left_bearing = 0, top_bearing = 0; 130 FT_UShort advance_width = 0, advance_height = 0; 131 132 /* we must preserve the stream position */ 133 /* (which gets altered by the metrics functions) */ 134 FT_ULong pos = FT_STREAM_POS(); 135 136 137 TT_Get_HMetrics( face, glyph_index, 138 &left_bearing, 139 &advance_width ); 140 TT_Get_VMetrics( face, glyph_index, 141 loader->bbox.yMax, 142 &top_bearing, 143 &advance_height ); 144 145 if ( FT_STREAM_SEEK( pos ) ) 146 return error; 147 148 loader->left_bearing = left_bearing; 149 loader->advance = advance_width; 150 loader->top_bearing = top_bearing; 151 loader->vadvance = advance_height; 152 153#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 154 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 155 { 156 if ( loader->exec ) 157 loader->exec->sph_tweak_flags = 0; 158 159 /* this may not be the right place for this, but it works */ 160 if ( loader->exec && loader->exec->ignore_x_mode ) 161 sph_set_tweaks( loader, glyph_index ); 162 } 163#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ 164 165 if ( !loader->linear_def ) 166 { 167 loader->linear_def = 1; 168 loader->linear = advance_width; 169 } 170 171 return FT_Err_Ok; 172 } 173 174 175#ifdef FT_CONFIG_OPTION_INCREMENTAL 176 177 static void 178 tt_get_metrics_incr_overrides( TT_Loader loader, 179 FT_UInt glyph_index ) 180 { 181 TT_Face face = (TT_Face)loader->face; 182 183 FT_Short left_bearing = 0, top_bearing = 0; 184 FT_UShort advance_width = 0, advance_height = 0; 185 186 187 /* If this is an incrementally loaded font check whether there are */ 188 /* overriding metrics for this glyph. */ 189 if ( face->root.internal->incremental_interface && 190 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 191 { 192 FT_Incremental_MetricsRec metrics; 193 FT_Error error; 194 195 196 metrics.bearing_x = loader->left_bearing; 197 metrics.bearing_y = 0; 198 metrics.advance = loader->advance; 199 metrics.advance_v = 0; 200 201 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 202 face->root.internal->incremental_interface->object, 203 glyph_index, FALSE, &metrics ); 204 if ( error ) 205 goto Exit; 206 207 left_bearing = (FT_Short)metrics.bearing_x; 208 advance_width = (FT_UShort)metrics.advance; 209 210#if 0 211 212 /* GWW: Do I do the same for vertical metrics? */ 213 metrics.bearing_x = 0; 214 metrics.bearing_y = loader->top_bearing; 215 metrics.advance = loader->vadvance; 216 217 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 218 face->root.internal->incremental_interface->object, 219 glyph_index, TRUE, &metrics ); 220 if ( error ) 221 goto Exit; 222 223 top_bearing = (FT_Short)metrics.bearing_y; 224 advance_height = (FT_UShort)metrics.advance; 225 226#endif /* 0 */ 227 228 loader->left_bearing = left_bearing; 229 loader->advance = advance_width; 230 loader->top_bearing = top_bearing; 231 loader->vadvance = advance_height; 232 233 if ( !loader->linear_def ) 234 { 235 loader->linear_def = 1; 236 loader->linear = advance_width; 237 } 238 } 239 240 Exit: 241 return; 242 } 243 244#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 245 246 247 /*************************************************************************/ 248 /* */ 249 /* Translates an array of coordinates. */ 250 /* */ 251 static void 252 translate_array( FT_UInt n, 253 FT_Vector* coords, 254 FT_Pos delta_x, 255 FT_Pos delta_y ) 256 { 257 FT_UInt k; 258 259 260 if ( delta_x ) 261 for ( k = 0; k < n; k++ ) 262 coords[k].x += delta_x; 263 264 if ( delta_y ) 265 for ( k = 0; k < n; k++ ) 266 coords[k].y += delta_y; 267 } 268 269 270 /*************************************************************************/ 271 /* */ 272 /* The following functions are used by default with TrueType fonts. */ 273 /* However, they can be replaced by alternatives if we need to support */ 274 /* TrueType-compressed formats (like MicroType) in the future. */ 275 /* */ 276 /*************************************************************************/ 277 278 FT_CALLBACK_DEF( FT_Error ) 279 TT_Access_Glyph_Frame( TT_Loader loader, 280 FT_UInt glyph_index, 281 FT_ULong offset, 282 FT_UInt byte_count ) 283 { 284 FT_Error error; 285 FT_Stream stream = loader->stream; 286 287 /* for non-debug mode */ 288 FT_UNUSED( glyph_index ); 289 290 291 FT_TRACE4(( "Glyph %ld\n", glyph_index )); 292 293 /* the following line sets the `error' variable through macros! */ 294 if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) ) 295 return error; 296 297 loader->cursor = stream->cursor; 298 loader->limit = stream->limit; 299 300 return FT_Err_Ok; 301 } 302 303 304 FT_CALLBACK_DEF( void ) 305 TT_Forget_Glyph_Frame( TT_Loader loader ) 306 { 307 FT_Stream stream = loader->stream; 308 309 310 FT_FRAME_EXIT(); 311 } 312 313 314 FT_CALLBACK_DEF( FT_Error ) 315 TT_Load_Glyph_Header( TT_Loader loader ) 316 { 317 FT_Byte* p = loader->cursor; 318 FT_Byte* limit = loader->limit; 319 320 321 if ( p + 10 > limit ) 322 return FT_THROW( Invalid_Outline ); 323 324 loader->n_contours = FT_NEXT_SHORT( p ); 325 326 loader->bbox.xMin = FT_NEXT_SHORT( p ); 327 loader->bbox.yMin = FT_NEXT_SHORT( p ); 328 loader->bbox.xMax = FT_NEXT_SHORT( p ); 329 loader->bbox.yMax = FT_NEXT_SHORT( p ); 330 331 FT_TRACE5(( " # of contours: %d\n", loader->n_contours )); 332 FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin, 333 loader->bbox.xMax )); 334 FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin, 335 loader->bbox.yMax )); 336 loader->cursor = p; 337 338 return FT_Err_Ok; 339 } 340 341 342 FT_CALLBACK_DEF( FT_Error ) 343 TT_Load_Simple_Glyph( TT_Loader load ) 344 { 345 FT_Error error; 346 FT_Byte* p = load->cursor; 347 FT_Byte* limit = load->limit; 348 FT_GlyphLoader gloader = load->gloader; 349 FT_Int n_contours = load->n_contours; 350 FT_Outline* outline; 351 FT_UShort n_ins; 352 FT_Int n_points; 353 FT_ULong tmp; 354 355 FT_Byte *flag, *flag_limit; 356 FT_Byte c, count; 357 FT_Vector *vec, *vec_limit; 358 FT_Pos x; 359 FT_Short *cont, *cont_limit, prev_cont; 360 FT_Int xy_size = 0; 361 362 363 /* check that we can add the contours to the glyph */ 364 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours ); 365 if ( error ) 366 goto Fail; 367 368 /* reading the contours' endpoints & number of points */ 369 cont = gloader->current.outline.contours; 370 cont_limit = cont + n_contours; 371 372 /* check space for contours array + instructions count */ 373 if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit ) 374 goto Invalid_Outline; 375 376 prev_cont = FT_NEXT_SHORT( p ); 377 378 if ( n_contours > 0 ) 379 cont[0] = prev_cont; 380 381 if ( prev_cont < 0 ) 382 goto Invalid_Outline; 383 384 for ( cont++; cont < cont_limit; cont++ ) 385 { 386 cont[0] = FT_NEXT_SHORT( p ); 387 if ( cont[0] <= prev_cont ) 388 { 389 /* unordered contours: this is invalid */ 390 goto Invalid_Outline; 391 } 392 prev_cont = cont[0]; 393 } 394 395 n_points = 0; 396 if ( n_contours > 0 ) 397 { 398 n_points = cont[-1] + 1; 399 if ( n_points < 0 ) 400 goto Invalid_Outline; 401 } 402 403 /* note that we will add four phantom points later */ 404 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 ); 405 if ( error ) 406 goto Fail; 407 408 /* reading the bytecode instructions */ 409 load->glyph->control_len = 0; 410 load->glyph->control_data = 0; 411 412 if ( p + 2 > limit ) 413 goto Invalid_Outline; 414 415 n_ins = FT_NEXT_USHORT( p ); 416 417 FT_TRACE5(( " Instructions size: %u\n", n_ins )); 418 419 /* check it */ 420 if ( ( limit - p ) < n_ins ) 421 { 422 FT_TRACE0(( "TT_Load_Simple_Glyph: instruction count mismatch\n" )); 423 error = FT_THROW( Too_Many_Hints ); 424 goto Fail; 425 } 426 427#ifdef TT_USE_BYTECODE_INTERPRETER 428 429 if ( IS_HINTED( load->load_flags ) ) 430 { 431 /* we don't trust `maxSizeOfInstructions' in the `maxp' table */ 432 /* and thus update the bytecode array size by ourselves */ 433 434 tmp = load->exec->glyphSize; 435 error = Update_Max( load->exec->memory, 436 &tmp, 437 sizeof ( FT_Byte ), 438 (void*)&load->exec->glyphIns, 439 n_ins ); 440 441 load->exec->glyphSize = (FT_UShort)tmp; 442 if ( error ) 443 return error; 444 445 load->glyph->control_len = n_ins; 446 load->glyph->control_data = load->exec->glyphIns; 447 448 FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins ); 449 } 450 451#endif /* TT_USE_BYTECODE_INTERPRETER */ 452 453 p += n_ins; 454 455 outline = &gloader->current.outline; 456 457 /* reading the point tags */ 458 flag = (FT_Byte*)outline->tags; 459 flag_limit = flag + n_points; 460 461 FT_ASSERT( flag != NULL ); 462 463 while ( flag < flag_limit ) 464 { 465 if ( p + 1 > limit ) 466 goto Invalid_Outline; 467 468 *flag++ = c = FT_NEXT_BYTE( p ); 469 if ( c & 8 ) 470 { 471 if ( p + 1 > limit ) 472 goto Invalid_Outline; 473 474 count = FT_NEXT_BYTE( p ); 475 if ( flag + (FT_Int)count > flag_limit ) 476 goto Invalid_Outline; 477 478 for ( ; count > 0; count-- ) 479 *flag++ = c; 480 } 481 } 482 483 /* reading the X coordinates */ 484 485 vec = outline->points; 486 vec_limit = vec + n_points; 487 flag = (FT_Byte*)outline->tags; 488 x = 0; 489 490 if ( p + xy_size > limit ) 491 goto Invalid_Outline; 492 493 for ( ; vec < vec_limit; vec++, flag++ ) 494 { 495 FT_Pos y = 0; 496 FT_Byte f = *flag; 497 498 499 if ( f & 2 ) 500 { 501 if ( p + 1 > limit ) 502 goto Invalid_Outline; 503 504 y = (FT_Pos)FT_NEXT_BYTE( p ); 505 if ( ( f & 16 ) == 0 ) 506 y = -y; 507 } 508 else if ( ( f & 16 ) == 0 ) 509 { 510 if ( p + 2 > limit ) 511 goto Invalid_Outline; 512 513 y = (FT_Pos)FT_NEXT_SHORT( p ); 514 } 515 516 x += y; 517 vec->x = x; 518 /* the cast is for stupid compilers */ 519 *flag = (FT_Byte)( f & ~( 2 | 16 ) ); 520 } 521 522 /* reading the Y coordinates */ 523 524 vec = gloader->current.outline.points; 525 vec_limit = vec + n_points; 526 flag = (FT_Byte*)outline->tags; 527 x = 0; 528 529 for ( ; vec < vec_limit; vec++, flag++ ) 530 { 531 FT_Pos y = 0; 532 FT_Byte f = *flag; 533 534 535 if ( f & 4 ) 536 { 537 if ( p + 1 > limit ) 538 goto Invalid_Outline; 539 540 y = (FT_Pos)FT_NEXT_BYTE( p ); 541 if ( ( f & 32 ) == 0 ) 542 y = -y; 543 } 544 else if ( ( f & 32 ) == 0 ) 545 { 546 if ( p + 2 > limit ) 547 goto Invalid_Outline; 548 549 y = (FT_Pos)FT_NEXT_SHORT( p ); 550 } 551 552 x += y; 553 vec->y = x; 554 /* the cast is for stupid compilers */ 555 *flag = (FT_Byte)( f & FT_CURVE_TAG_ON ); 556 } 557 558 outline->n_points = (FT_UShort)n_points; 559 outline->n_contours = (FT_Short) n_contours; 560 561 load->cursor = p; 562 563 Fail: 564 return error; 565 566 Invalid_Outline: 567 error = FT_THROW( Invalid_Outline ); 568 goto Fail; 569 } 570 571 572 FT_CALLBACK_DEF( FT_Error ) 573 TT_Load_Composite_Glyph( TT_Loader loader ) 574 { 575 FT_Error error; 576 FT_Byte* p = loader->cursor; 577 FT_Byte* limit = loader->limit; 578 FT_GlyphLoader gloader = loader->gloader; 579 FT_SubGlyph subglyph; 580 FT_UInt num_subglyphs; 581 582 583 num_subglyphs = 0; 584 585 do 586 { 587 FT_Fixed xx, xy, yy, yx; 588 FT_UInt count; 589 590 591 /* check that we can load a new subglyph */ 592 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 ); 593 if ( error ) 594 goto Fail; 595 596 /* check space */ 597 if ( p + 4 > limit ) 598 goto Invalid_Composite; 599 600 subglyph = gloader->current.subglyphs + num_subglyphs; 601 602 subglyph->arg1 = subglyph->arg2 = 0; 603 604 subglyph->flags = FT_NEXT_USHORT( p ); 605 subglyph->index = FT_NEXT_USHORT( p ); 606 607 /* check space */ 608 count = 2; 609 if ( subglyph->flags & ARGS_ARE_WORDS ) 610 count += 2; 611 if ( subglyph->flags & WE_HAVE_A_SCALE ) 612 count += 2; 613 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 614 count += 4; 615 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 616 count += 8; 617 618 if ( p + count > limit ) 619 goto Invalid_Composite; 620 621 /* read arguments */ 622 if ( subglyph->flags & ARGS_ARE_WORDS ) 623 { 624 subglyph->arg1 = FT_NEXT_SHORT( p ); 625 subglyph->arg2 = FT_NEXT_SHORT( p ); 626 } 627 else 628 { 629 subglyph->arg1 = FT_NEXT_CHAR( p ); 630 subglyph->arg2 = FT_NEXT_CHAR( p ); 631 } 632 633 /* read transform */ 634 xx = yy = 0x10000L; 635 xy = yx = 0; 636 637 if ( subglyph->flags & WE_HAVE_A_SCALE ) 638 { 639 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 640 yy = xx; 641 } 642 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 643 { 644 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 645 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 646 } 647 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 648 { 649 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 650 yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 651 xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 652 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 653 } 654 655 subglyph->transform.xx = xx; 656 subglyph->transform.xy = xy; 657 subglyph->transform.yx = yx; 658 subglyph->transform.yy = yy; 659 660 num_subglyphs++; 661 662 } while ( subglyph->flags & MORE_COMPONENTS ); 663 664 gloader->current.num_subglyphs = 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 - start_point ); 711 zone->n_contours = (FT_Short) ( load->outline.n_contours - 712 start_contour ); 713 zone->org = load->extra_points + start_point; 714 zone->cur = load->outline.points + start_point; 715 zone->orus = load->extra_points2 + start_point; 716 zone->tags = (FT_Byte*)load->outline.tags + start_point; 717 zone->contours = (FT_UShort*)load->outline.contours + start_contour; 718 zone->first_point = (FT_UShort)start_point; 719 } 720 721 722 /*************************************************************************/ 723 /* */ 724 /* <Function> */ 725 /* TT_Hint_Glyph */ 726 /* */ 727 /* <Description> */ 728 /* Hint the glyph using the zone prepared by the caller. Note that */ 729 /* the zone is supposed to include four phantom points. */ 730 /* */ 731 static FT_Error 732 TT_Hint_Glyph( TT_Loader loader, 733 FT_Bool is_composite ) 734 { 735#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 736 TT_Face face = (TT_Face)loader->face; 737 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); 738#endif 739 740 TT_GlyphZone zone = &loader->zone; 741 FT_Pos origin; 742 743#ifdef TT_USE_BYTECODE_INTERPRETER 744 FT_UInt n_ins; 745#else 746 FT_UNUSED( is_composite ); 747#endif 748 749 750#ifdef TT_USE_BYTECODE_INTERPRETER 751 if ( loader->glyph->control_len > 0xFFFFL ) 752 { 753 FT_TRACE1(( "TT_Hint_Glyph: too long instructions" )); 754 FT_TRACE1(( " (0x%lx byte) is truncated\n", 755 loader->glyph->control_len )); 756 } 757 n_ins = (FT_UInt)( loader->glyph->control_len ); 758#endif 759 760 origin = zone->cur[zone->n_points - 4].x; 761 origin = FT_PIX_ROUND( origin ) - origin; 762 if ( origin ) 763 translate_array( zone->n_points, zone->cur, origin, 0 ); 764 765#ifdef TT_USE_BYTECODE_INTERPRETER 766 /* save original point position in org */ 767 if ( n_ins > 0 ) 768 FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points ); 769 770 /* Reset graphics state. */ 771 loader->exec->GS = ((TT_Size)loader->size)->GS; 772 773 /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */ 774 /* completely refer to the (already) hinted subglyphs. */ 775 if ( is_composite ) 776 { 777 loader->exec->metrics.x_scale = 1 << 16; 778 loader->exec->metrics.y_scale = 1 << 16; 779 780 FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points ); 781 } 782 else 783 { 784 loader->exec->metrics.x_scale = 785 ((TT_Size)loader->size)->metrics.x_scale; 786 loader->exec->metrics.y_scale = 787 ((TT_Size)loader->size)->metrics.y_scale; 788 } 789#endif 790 791 /* round pp2 and pp4 */ 792 zone->cur[zone->n_points - 3].x = 793 FT_PIX_ROUND( zone->cur[zone->n_points - 3].x ); 794 zone->cur[zone->n_points - 1].y = 795 FT_PIX_ROUND( zone->cur[zone->n_points - 1].y ); 796 797#ifdef TT_USE_BYTECODE_INTERPRETER 798 799 if ( n_ins > 0 ) 800 { 801 FT_Bool debug; 802 FT_Error error; 803 804 FT_GlyphLoader gloader = loader->gloader; 805 FT_Outline current_outline = gloader->current.outline; 806 807 808 error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph, 809 loader->exec->glyphIns, n_ins ); 810 if ( error ) 811 return error; 812 813 loader->exec->is_composite = is_composite; 814 loader->exec->pts = *zone; 815 816 debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) && 817 ((TT_Size)loader->size)->debug ); 818 819 error = TT_Run_Context( loader->exec, debug ); 820 if ( error && loader->exec->pedantic_hinting ) 821 return error; 822 823 /* store drop-out mode in bits 5-7; set bit 2 also as a marker */ 824 current_outline.tags[0] |= 825 ( loader->exec->GS.scan_type << 5 ) | FT_CURVE_TAG_HAS_SCANMODE; 826 } 827 828#endif 829 830 /* save glyph phantom points */ 831 if ( !loader->preserve_pps ) 832 { 833 loader->pp1 = zone->cur[zone->n_points - 4]; 834 loader->pp2 = zone->cur[zone->n_points - 3]; 835 loader->pp3 = zone->cur[zone->n_points - 2]; 836 loader->pp4 = zone->cur[zone->n_points - 1]; 837 } 838 839#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 840 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 841 { 842 if ( loader->exec->sph_tweak_flags & SPH_TWEAK_DEEMBOLDEN ) 843 FT_Outline_EmboldenXY( &loader->gloader->current.outline, -24, 0 ); 844 845 else if ( loader->exec->sph_tweak_flags & SPH_TWEAK_EMBOLDEN ) 846 FT_Outline_EmboldenXY( &loader->gloader->current.outline, 24, 0 ); 847 } 848#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ 849 850 return FT_Err_Ok; 851 } 852 853 854 /*************************************************************************/ 855 /* */ 856 /* <Function> */ 857 /* TT_Process_Simple_Glyph */ 858 /* */ 859 /* <Description> */ 860 /* Once a simple glyph has been loaded, it needs to be processed. */ 861 /* Usually, this means scaling and hinting through bytecode */ 862 /* interpretation. */ 863 /* */ 864 static FT_Error 865 TT_Process_Simple_Glyph( TT_Loader loader ) 866 { 867 FT_GlyphLoader gloader = loader->gloader; 868 FT_Error error = FT_Err_Ok; 869 FT_Outline* outline; 870 FT_Int n_points; 871 872 873 outline = &gloader->current.outline; 874 n_points = outline->n_points; 875 876 /* set phantom points */ 877 878 outline->points[n_points ] = loader->pp1; 879 outline->points[n_points + 1] = loader->pp2; 880 outline->points[n_points + 2] = loader->pp3; 881 outline->points[n_points + 3] = loader->pp4; 882 883 outline->tags[n_points ] = 0; 884 outline->tags[n_points + 1] = 0; 885 outline->tags[n_points + 2] = 0; 886 outline->tags[n_points + 3] = 0; 887 888 n_points += 4; 889 890#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 891 892 if ( ((TT_Face)loader->face)->doblend ) 893 { 894 /* Deltas apply to the unscaled data. */ 895 FT_Vector* deltas; 896 FT_Memory memory = loader->face->memory; 897 FT_Int i; 898 899 900 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), 901 loader->glyph_index, 902 &deltas, 903 n_points ); 904 if ( error ) 905 return error; 906 907 for ( i = 0; i < n_points; ++i ) 908 { 909 outline->points[i].x += deltas[i].x; 910 outline->points[i].y += deltas[i].y; 911 } 912 913 FT_FREE( deltas ); 914 } 915 916#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 917 918 if ( IS_HINTED( loader->load_flags ) ) 919 { 920 tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 ); 921 922 FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur, 923 loader->zone.n_points + 4 ); 924 } 925 926 { 927#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 928 TT_Face face = (TT_Face)loader->face; 929 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); 930 931 FT_String* family = face->root.family_name; 932 FT_Int ppem = loader->size->metrics.x_ppem; 933 FT_String* style = face->root.style_name; 934 FT_Int x_scale_factor = 1000; 935#endif 936 937 FT_Vector* vec = outline->points; 938 FT_Vector* limit = outline->points + n_points; 939 940 FT_Fixed x_scale = 0; /* pacify compiler */ 941 FT_Fixed y_scale = 0; 942 943 FT_Bool do_scale = FALSE; 944 945 946#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 947 948 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 949 { 950 /* scale, but only if enabled and only if TT hinting is being used */ 951 if ( IS_HINTED( loader->load_flags ) ) 952 x_scale_factor = sph_test_tweak_x_scaling( face, 953 family, 954 ppem, 955 style, 956 loader->glyph_index ); 957 /* scale the glyph */ 958 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 || 959 x_scale_factor != 1000 ) 960 { 961 x_scale = FT_MulDiv( ((TT_Size)loader->size)->metrics.x_scale, 962 x_scale_factor, 1000 ); 963 y_scale = ((TT_Size)loader->size)->metrics.y_scale; 964 965 /* compensate for any scaling by de/emboldening; */ 966 /* the amount was determined via experimentation */ 967 if ( x_scale_factor != 1000 && ppem > 11 ) 968 FT_Outline_EmboldenXY( outline, 969 FT_MulFix( 1280 * ppem, 970 1000 - x_scale_factor ), 971 0 ); 972 do_scale = TRUE; 973 } 974 } 975 else 976 977#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ 978 979 { 980 /* scale the glyph */ 981 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 982 { 983 x_scale = ((TT_Size)loader->size)->metrics.x_scale; 984 y_scale = ((TT_Size)loader->size)->metrics.y_scale; 985 986 do_scale = TRUE; 987 } 988 } 989 990 if ( do_scale ) 991 { 992 for ( ; vec < limit; vec++ ) 993 { 994 vec->x = FT_MulFix( vec->x, x_scale ); 995 vec->y = FT_MulFix( vec->y, y_scale ); 996 } 997 998 loader->pp1 = outline->points[n_points - 4]; 999 loader->pp2 = outline->points[n_points - 3]; 1000 loader->pp3 = outline->points[n_points - 2]; 1001 loader->pp4 = outline->points[n_points - 1]; 1002 } 1003 } 1004 1005 if ( IS_HINTED( loader->load_flags ) ) 1006 { 1007 loader->zone.n_points += 4; 1008 1009 error = TT_Hint_Glyph( loader, 0 ); 1010 } 1011 1012 return error; 1013 } 1014 1015 1016 /*************************************************************************/ 1017 /* */ 1018 /* <Function> */ 1019 /* TT_Process_Composite_Component */ 1020 /* */ 1021 /* <Description> */ 1022 /* Once a composite component has been loaded, it needs to be */ 1023 /* processed. Usually, this means transforming and translating. */ 1024 /* */ 1025 static FT_Error 1026 TT_Process_Composite_Component( TT_Loader loader, 1027 FT_SubGlyph subglyph, 1028 FT_UInt start_point, 1029 FT_UInt num_base_points ) 1030 { 1031 FT_GlyphLoader gloader = loader->gloader; 1032 FT_Vector* base_vec = gloader->base.outline.points; 1033 FT_UInt num_points = gloader->base.outline.n_points; 1034 FT_Bool have_scale; 1035 FT_Pos x, y; 1036 1037 1038 have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE | 1039 WE_HAVE_AN_XY_SCALE | 1040 WE_HAVE_A_2X2 ) ); 1041 1042 /* perform the transform required for this subglyph */ 1043 if ( have_scale ) 1044 { 1045 FT_UInt i; 1046 1047 1048 for ( i = num_base_points; i < num_points; i++ ) 1049 FT_Vector_Transform( base_vec + i, &subglyph->transform ); 1050 } 1051 1052 /* get offset */ 1053 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) 1054 { 1055 FT_UInt k = subglyph->arg1; 1056 FT_UInt l = subglyph->arg2; 1057 FT_Vector* p1; 1058 FT_Vector* p2; 1059 1060 1061 /* match l-th point of the newly loaded component to the k-th point */ 1062 /* of the previously loaded components. */ 1063 1064 /* change to the point numbers used by our outline */ 1065 k += start_point; 1066 l += num_base_points; 1067 if ( k >= num_base_points || 1068 l >= num_points ) 1069 return FT_THROW( Invalid_Composite ); 1070 1071 p1 = gloader->base.outline.points + k; 1072 p2 = gloader->base.outline.points + l; 1073 1074 x = p1->x - p2->x; 1075 y = p1->y - p2->y; 1076 } 1077 else 1078 { 1079 x = subglyph->arg1; 1080 y = subglyph->arg2; 1081 1082 if ( !x && !y ) 1083 return FT_Err_Ok; 1084 1085 /* Use a default value dependent on */ 1086 /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */ 1087 /* fonts which don't set the xxx_COMPONENT_OFFSET bit. */ 1088 1089 if ( have_scale && 1090#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED 1091 !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) ) 1092#else 1093 ( subglyph->flags & SCALED_COMPONENT_OFFSET ) ) 1094#endif 1095 { 1096 1097#if 0 1098 1099 /*************************************************************************/ 1100 /* */ 1101 /* This algorithm is what Apple documents. But it doesn't work. */ 1102 /* */ 1103 int a = subglyph->transform.xx > 0 ? subglyph->transform.xx 1104 : -subglyph->transform.xx; 1105 int b = subglyph->transform.yx > 0 ? subglyph->transform.yx 1106 : -subglyph->transform.yx; 1107 int c = subglyph->transform.xy > 0 ? subglyph->transform.xy 1108 : -subglyph->transform.xy; 1109 int d = subglyph->transform.yy > 0 ? subglyph->transform.yy 1110 : -subglyph->transform.yy; 1111 int m = a > b ? a : b; 1112 int n = c > d ? c : d; 1113 1114 1115 if ( a - b <= 33 && a - b >= -33 ) 1116 m *= 2; 1117 if ( c - d <= 33 && c - d >= -33 ) 1118 n *= 2; 1119 x = FT_MulFix( x, m ); 1120 y = FT_MulFix( y, n ); 1121 1122#else /* 0 */ 1123 1124 /*************************************************************************/ 1125 /* */ 1126 /* This algorithm is a guess and works much better than the above. */ 1127 /* */ 1128 FT_Fixed mac_xscale = FT_Hypot( subglyph->transform.xx, 1129 subglyph->transform.xy ); 1130 FT_Fixed mac_yscale = FT_Hypot( subglyph->transform.yy, 1131 subglyph->transform.yx ); 1132 1133 1134 x = FT_MulFix( x, mac_xscale ); 1135 y = FT_MulFix( y, mac_yscale ); 1136 1137#endif /* 0 */ 1138 1139 } 1140 1141 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1142 { 1143 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; 1144 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; 1145 1146 1147 x = FT_MulFix( x, x_scale ); 1148 y = FT_MulFix( y, y_scale ); 1149 1150 if ( subglyph->flags & ROUND_XY_TO_GRID ) 1151 { 1152 x = FT_PIX_ROUND( x ); 1153 y = FT_PIX_ROUND( y ); 1154 } 1155 } 1156 } 1157 1158 if ( x || y ) 1159 translate_array( num_points - num_base_points, 1160 base_vec + num_base_points, 1161 x, y ); 1162 1163 return FT_Err_Ok; 1164 } 1165 1166 1167 /*************************************************************************/ 1168 /* */ 1169 /* <Function> */ 1170 /* TT_Process_Composite_Glyph */ 1171 /* */ 1172 /* <Description> */ 1173 /* This is slightly different from TT_Process_Simple_Glyph, in that */ 1174 /* its sole purpose is to hint the glyph. Thus this function is */ 1175 /* only available when bytecode interpreter is enabled. */ 1176 /* */ 1177 static FT_Error 1178 TT_Process_Composite_Glyph( TT_Loader loader, 1179 FT_UInt start_point, 1180 FT_UInt start_contour ) 1181 { 1182 FT_Error error; 1183 FT_Outline* outline; 1184 FT_UInt i; 1185 1186 1187 outline = &loader->gloader->base.outline; 1188 1189 /* make room for phantom points */ 1190 error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader, 1191 outline->n_points + 4, 1192 0 ); 1193 if ( error ) 1194 return error; 1195 1196 outline->points[outline->n_points ] = loader->pp1; 1197 outline->points[outline->n_points + 1] = loader->pp2; 1198 outline->points[outline->n_points + 2] = loader->pp3; 1199 outline->points[outline->n_points + 3] = loader->pp4; 1200 1201 outline->tags[outline->n_points ] = 0; 1202 outline->tags[outline->n_points + 1] = 0; 1203 outline->tags[outline->n_points + 2] = 0; 1204 outline->tags[outline->n_points + 3] = 0; 1205 1206#ifdef TT_USE_BYTECODE_INTERPRETER 1207 1208 { 1209 FT_Stream stream = loader->stream; 1210 FT_UShort n_ins, max_ins; 1211 FT_ULong tmp; 1212 1213 1214 /* TT_Load_Composite_Glyph only gives us the offset of instructions */ 1215 /* so we read them here */ 1216 if ( FT_STREAM_SEEK( loader->ins_pos ) || 1217 FT_READ_USHORT( n_ins ) ) 1218 return error; 1219 1220 FT_TRACE5(( " Instructions size = %d\n", n_ins )); 1221 1222 /* check it */ 1223 max_ins = ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions; 1224 if ( n_ins > max_ins ) 1225 { 1226 /* don't trust `maxSizeOfInstructions'; */ 1227 /* only do a rough safety check */ 1228 if ( (FT_Int)n_ins > loader->byte_len ) 1229 { 1230 FT_TRACE1(( "TT_Process_Composite_Glyph:" 1231 " too many instructions (%d) for glyph with length %d\n", 1232 n_ins, loader->byte_len )); 1233 return FT_THROW( Too_Many_Hints ); 1234 } 1235 1236 tmp = loader->exec->glyphSize; 1237 error = Update_Max( loader->exec->memory, 1238 &tmp, 1239 sizeof ( FT_Byte ), 1240 (void*)&loader->exec->glyphIns, 1241 n_ins ); 1242 1243 loader->exec->glyphSize = (FT_UShort)tmp; 1244 if ( error ) 1245 return error; 1246 } 1247 else if ( n_ins == 0 ) 1248 return FT_Err_Ok; 1249 1250 if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) ) 1251 return error; 1252 1253 loader->glyph->control_data = loader->exec->glyphIns; 1254 loader->glyph->control_len = n_ins; 1255 } 1256 1257#endif 1258 1259 tt_prepare_zone( &loader->zone, &loader->gloader->base, 1260 start_point, start_contour ); 1261 1262 /* Some points are likely touched during execution of */ 1263 /* instructions on components. So let's untouch them. */ 1264 for ( i = 0; i < loader->zone.n_points; i++ ) 1265 loader->zone.tags[i] &= ~FT_CURVE_TAG_TOUCH_BOTH; 1266 1267 loader->zone.n_points += 4; 1268 1269 return TT_Hint_Glyph( loader, 1 ); 1270 } 1271 1272 1273 /* 1274 * Calculate the phantom points 1275 * 1276 * Defining the right side bearing (rsb) as 1277 * 1278 * rsb = aw - (lsb + xmax - xmin) 1279 * 1280 * (with `aw' the advance width, `lsb' the left side bearing, and `xmin' 1281 * and `xmax' the glyph's minimum and maximum x value), the OpenType 1282 * specification defines the initial position of horizontal phantom points 1283 * as 1284 * 1285 * pp1 = (xmin - lsb, 0) , 1286 * pp2 = (pp1 + aw, 0) . 1287 * 1288 * However, the specification lacks the precise definition of vertical 1289 * phantom points. Greg Hitchcock provided the following explanation. 1290 * 1291 * - a `vmtx' table is present 1292 * 1293 * For any glyph, the minimum and maximum y values (`ymin' and `ymax') 1294 * are given in the `glyf' table, the top side bearing (tsb) and advance 1295 * height (ah) are given in the `vmtx' table. The bottom side bearing 1296 * (bsb) is then calculated as 1297 * 1298 * bsb = ah - (tsb + ymax - ymin) , 1299 * 1300 * and the initial position of vertical phantom points is 1301 * 1302 * pp3 = (x, ymax + tsb) , 1303 * pp4 = (x, pp3 - ah) . 1304 * 1305 * See below for value `x'. 1306 * 1307 * - no `vmtx' table in the font 1308 * 1309 * If there is an `OS/2' table, we set 1310 * 1311 * DefaultAscender = sTypoAscender , 1312 * DefaultDescender = sTypoDescender , 1313 * 1314 * otherwise we use data from the `hhea' table: 1315 * 1316 * DefaultAscender = Ascender , 1317 * DefaultDescender = Descender . 1318 * 1319 * With these two variables we can now set 1320 * 1321 * ah = DefaultAscender - sDefaultDescender , 1322 * tsb = DefaultAscender - yMax , 1323 * 1324 * and proceed as if a `vmtx' table was present. 1325 * 1326 * Usually we have 1327 * 1328 * x = aw / 2 , 1329 * 1330 * but there is a compatibility case where it can be set to 1331 * 1332 * x = -DefaultDescender - 1333 * ((DefaultAscender - DefaultDescender - aw) / 2) . 1334 * 1335 */ 1336#define TT_LOADER_SET_PP( loader ) \ 1337 do { \ 1338 (loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \ 1339 (loader)->pp1.y = 0; \ 1340 (loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \ 1341 (loader)->pp2.y = 0; \ 1342 (loader)->pp3.x = (loader)->advance / 2; \ 1343 (loader)->pp3.y = (loader)->bbox.yMax + (loader)->top_bearing; \ 1344 (loader)->pp4.x = (loader)->advance / 2; \ 1345 (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \ 1346 } while ( 0 ) 1347 1348 1349 /*************************************************************************/ 1350 /* */ 1351 /* <Function> */ 1352 /* load_truetype_glyph */ 1353 /* */ 1354 /* <Description> */ 1355 /* Loads a given truetype glyph. Handles composites and uses a */ 1356 /* TT_Loader object. */ 1357 /* */ 1358 static FT_Error 1359 load_truetype_glyph( TT_Loader loader, 1360 FT_UInt glyph_index, 1361 FT_UInt recurse_count, 1362 FT_Bool header_only ) 1363 { 1364 FT_Error error = FT_Err_Ok; 1365 FT_Fixed x_scale, y_scale; 1366 FT_ULong offset; 1367 TT_Face face = (TT_Face)loader->face; 1368 FT_GlyphLoader gloader = loader->gloader; 1369 FT_Bool opened_frame = 0; 1370 1371#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1372 FT_Vector* deltas = NULL; 1373#endif 1374 1375#ifdef FT_CONFIG_OPTION_INCREMENTAL 1376 FT_StreamRec inc_stream; 1377 FT_Data glyph_data; 1378 FT_Bool glyph_data_loaded = 0; 1379#endif 1380 1381 1382 /* some fonts have an incorrect value of `maxComponentDepth', */ 1383 /* thus we allow depth 1 to catch the majority of them */ 1384 if ( recurse_count > 1 && 1385 recurse_count > face->max_profile.maxComponentDepth ) 1386 { 1387 error = FT_THROW( Invalid_Composite ); 1388 goto Exit; 1389 } 1390 1391 /* check glyph index */ 1392 if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) 1393 { 1394 error = FT_THROW( Invalid_Glyph_Index ); 1395 goto Exit; 1396 } 1397 1398 loader->glyph_index = glyph_index; 1399 1400 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1401 { 1402 x_scale = ((TT_Size)loader->size)->metrics.x_scale; 1403 y_scale = ((TT_Size)loader->size)->metrics.y_scale; 1404 } 1405 else 1406 { 1407 x_scale = 0x10000L; 1408 y_scale = 0x10000L; 1409 } 1410 1411 /* Set `offset' to the start of the glyph relative to the start of */ 1412 /* the `glyf' table, and `byte_len' to the length of the glyph in */ 1413 /* bytes. */ 1414 1415#ifdef FT_CONFIG_OPTION_INCREMENTAL 1416 1417 /* If we are loading glyph data via the incremental interface, set */ 1418 /* the loader stream to a memory stream reading the data returned */ 1419 /* by the interface. */ 1420 if ( face->root.internal->incremental_interface ) 1421 { 1422 error = face->root.internal->incremental_interface->funcs->get_glyph_data( 1423 face->root.internal->incremental_interface->object, 1424 glyph_index, &glyph_data ); 1425 if ( error ) 1426 goto Exit; 1427 1428 glyph_data_loaded = 1; 1429 offset = 0; 1430 loader->byte_len = glyph_data.length; 1431 1432 FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) ); 1433 FT_Stream_OpenMemory( &inc_stream, 1434 glyph_data.pointer, glyph_data.length ); 1435 1436 loader->stream = &inc_stream; 1437 } 1438 else 1439 1440#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1441 1442 offset = tt_face_get_location( face, glyph_index, 1443 (FT_UInt*)&loader->byte_len ); 1444 1445 if ( loader->byte_len > 0 ) 1446 { 1447#ifdef FT_CONFIG_OPTION_INCREMENTAL 1448 /* for the incremental interface, `glyf_offset' is always zero */ 1449 if ( !loader->glyf_offset && 1450 !face->root.internal->incremental_interface ) 1451#else 1452 if ( !loader->glyf_offset ) 1453#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1454 { 1455 FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" )); 1456 error = FT_THROW( Invalid_Table ); 1457 goto Exit; 1458 } 1459 1460 error = face->access_glyph_frame( loader, glyph_index, 1461 loader->glyf_offset + offset, 1462 loader->byte_len ); 1463 if ( error ) 1464 goto Exit; 1465 1466 opened_frame = 1; 1467 1468 /* read glyph header first */ 1469 error = face->read_glyph_header( loader ); 1470 if ( error ) 1471 goto Exit; 1472 1473 /* the metrics must be computed after loading the glyph header */ 1474 /* since we need the glyph's `yMax' value in case the vertical */ 1475 /* metrics must be emulated */ 1476 error = tt_get_metrics( loader, glyph_index ); 1477 if ( error ) 1478 goto Exit; 1479 1480 if ( header_only ) 1481 goto Exit; 1482 } 1483 1484 if ( loader->byte_len == 0 || loader->n_contours == 0 ) 1485 { 1486 loader->bbox.xMin = 0; 1487 loader->bbox.xMax = 0; 1488 loader->bbox.yMin = 0; 1489 loader->bbox.yMax = 0; 1490 1491 error = tt_get_metrics( loader, glyph_index ); 1492 if ( error ) 1493 goto Exit; 1494 1495 if ( header_only ) 1496 goto Exit; 1497 1498 /* must initialize points before (possibly) overriding */ 1499 /* glyph metrics from the incremental interface */ 1500 TT_LOADER_SET_PP( loader ); 1501 1502#ifdef FT_CONFIG_OPTION_INCREMENTAL 1503 tt_get_metrics_incr_overrides( loader, glyph_index ); 1504#endif 1505 1506#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1507 1508 if ( ((TT_Face)(loader->face))->doblend ) 1509 { 1510 /* this must be done before scaling */ 1511 FT_Memory memory = loader->face->memory; 1512 1513 1514 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), 1515 glyph_index, &deltas, 4 ); 1516 if ( error ) 1517 goto Exit; 1518 1519 loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y; 1520 loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y; 1521 loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y; 1522 loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y; 1523 1524 FT_FREE( deltas ); 1525 } 1526 1527#endif 1528 1529 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1530 { 1531 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1532 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1533 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1534 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1535 } 1536 1537 error = FT_Err_Ok; 1538 goto Exit; 1539 } 1540 1541 /* must initialize points before (possibly) overriding */ 1542 /* glyph metrics from the incremental interface */ 1543 TT_LOADER_SET_PP( loader ); 1544 1545#ifdef FT_CONFIG_OPTION_INCREMENTAL 1546 tt_get_metrics_incr_overrides( loader, glyph_index ); 1547#endif 1548 1549 /***********************************************************************/ 1550 /***********************************************************************/ 1551 /***********************************************************************/ 1552 1553 /* if it is a simple glyph, load it */ 1554 1555 if ( loader->n_contours > 0 ) 1556 { 1557 error = face->read_simple_glyph( loader ); 1558 if ( error ) 1559 goto Exit; 1560 1561 /* all data have been read */ 1562 face->forget_glyph_frame( loader ); 1563 opened_frame = 0; 1564 1565 error = TT_Process_Simple_Glyph( loader ); 1566 if ( error ) 1567 goto Exit; 1568 1569 FT_GlyphLoader_Add( gloader ); 1570 } 1571 1572 /***********************************************************************/ 1573 /***********************************************************************/ 1574 /***********************************************************************/ 1575 1576 /* otherwise, load a composite! */ 1577 else if ( loader->n_contours == -1 ) 1578 { 1579 FT_UInt start_point; 1580 FT_UInt start_contour; 1581 FT_ULong ins_pos; /* position of composite instructions, if any */ 1582 1583 1584 start_point = gloader->base.outline.n_points; 1585 start_contour = gloader->base.outline.n_contours; 1586 1587 /* for each subglyph, read composite header */ 1588 error = face->read_composite_glyph( loader ); 1589 if ( error ) 1590 goto Exit; 1591 1592 /* store the offset of instructions */ 1593 ins_pos = loader->ins_pos; 1594 1595 /* all data we need are read */ 1596 face->forget_glyph_frame( loader ); 1597 opened_frame = 0; 1598 1599#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1600 1601 if ( face->doblend ) 1602 { 1603 FT_Int i, limit; 1604 FT_SubGlyph subglyph; 1605 FT_Memory memory = face->root.memory; 1606 1607 1608 /* this provides additional offsets */ 1609 /* for each component's translation */ 1610 1611 if ( ( error = TT_Vary_Get_Glyph_Deltas( 1612 face, 1613 glyph_index, 1614 &deltas, 1615 gloader->current.num_subglyphs + 4 )) != 0 ) 1616 goto Exit; 1617 1618 subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs; 1619 limit = gloader->current.num_subglyphs; 1620 1621 for ( i = 0; i < limit; ++i, ++subglyph ) 1622 { 1623 if ( subglyph->flags & ARGS_ARE_XY_VALUES ) 1624 { 1625 /* XXX: overflow check for subglyph->{arg1,arg2}. */ 1626 /* deltas[i].{x,y} must be within signed 16-bit, */ 1627 /* but the restriction of summed delta is not clear */ 1628 subglyph->arg1 += (FT_Int16)deltas[i].x; 1629 subglyph->arg2 += (FT_Int16)deltas[i].y; 1630 } 1631 } 1632 1633 loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y; 1634 loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y; 1635 loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y; 1636 loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y; 1637 1638 FT_FREE( deltas ); 1639 } 1640 1641#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 1642 1643 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1644 { 1645 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1646 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1647 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1648 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1649 } 1650 1651 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ 1652 /* `as is' in the glyph slot (the client application will be */ 1653 /* responsible for interpreting these data)... */ 1654 if ( loader->load_flags & FT_LOAD_NO_RECURSE ) 1655 { 1656 FT_GlyphLoader_Add( gloader ); 1657 loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE; 1658 1659 goto Exit; 1660 } 1661 1662 /*********************************************************************/ 1663 /*********************************************************************/ 1664 /*********************************************************************/ 1665 1666 { 1667 FT_UInt n, num_base_points; 1668 FT_SubGlyph subglyph = 0; 1669 1670 FT_UInt num_points = start_point; 1671 FT_UInt num_subglyphs = gloader->current.num_subglyphs; 1672 FT_UInt num_base_subgs = gloader->base.num_subglyphs; 1673 1674 FT_Stream old_stream = loader->stream; 1675 FT_Int old_byte_len = loader->byte_len; 1676 1677 1678 FT_GlyphLoader_Add( gloader ); 1679 1680 /* read each subglyph independently */ 1681 for ( n = 0; n < num_subglyphs; n++ ) 1682 { 1683 FT_Vector pp[4]; 1684 1685 1686 /* Each time we call load_truetype_glyph in this loop, the */ 1687 /* value of `gloader.base.subglyphs' can change due to table */ 1688 /* reallocations. We thus need to recompute the subglyph */ 1689 /* pointer on each iteration. */ 1690 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1691 1692 pp[0] = loader->pp1; 1693 pp[1] = loader->pp2; 1694 pp[2] = loader->pp3; 1695 pp[3] = loader->pp4; 1696 1697 num_base_points = gloader->base.outline.n_points; 1698 1699 error = load_truetype_glyph( loader, subglyph->index, 1700 recurse_count + 1, FALSE ); 1701 if ( error ) 1702 goto Exit; 1703 1704 /* restore subglyph pointer */ 1705 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1706 1707 if ( !( subglyph->flags & USE_MY_METRICS ) ) 1708 { 1709 loader->pp1 = pp[0]; 1710 loader->pp2 = pp[1]; 1711 loader->pp3 = pp[2]; 1712 loader->pp4 = pp[3]; 1713 } 1714 1715 num_points = gloader->base.outline.n_points; 1716 1717 if ( num_points == num_base_points ) 1718 continue; 1719 1720 /* gloader->base.outline consists of three parts: */ 1721 /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */ 1722 /* */ 1723 /* (1): exists from the beginning */ 1724 /* (2): components that have been loaded so far */ 1725 /* (3): the newly loaded component */ 1726 TT_Process_Composite_Component( loader, subglyph, start_point, 1727 num_base_points ); 1728 } 1729 1730 loader->stream = old_stream; 1731 loader->byte_len = old_byte_len; 1732 1733 /* process the glyph */ 1734 loader->ins_pos = ins_pos; 1735 if ( IS_HINTED( loader->load_flags ) && 1736 1737#ifdef TT_USE_BYTECODE_INTERPRETER 1738 1739 subglyph->flags & WE_HAVE_INSTR && 1740 1741#endif 1742 1743 num_points > start_point ) 1744 TT_Process_Composite_Glyph( loader, start_point, start_contour ); 1745 1746 } 1747 } 1748 else 1749 { 1750 /* invalid composite count (negative but not -1) */ 1751 error = FT_THROW( Invalid_Outline ); 1752 goto Exit; 1753 } 1754 1755 /***********************************************************************/ 1756 /***********************************************************************/ 1757 /***********************************************************************/ 1758 1759 Exit: 1760 1761 if ( opened_frame ) 1762 face->forget_glyph_frame( loader ); 1763 1764#ifdef FT_CONFIG_OPTION_INCREMENTAL 1765 1766 if ( glyph_data_loaded ) 1767 face->root.internal->incremental_interface->funcs->free_glyph_data( 1768 face->root.internal->incremental_interface->object, 1769 &glyph_data ); 1770 1771#endif 1772 1773 return error; 1774 } 1775 1776 1777 static FT_Error 1778 compute_glyph_metrics( TT_Loader loader, 1779 FT_UInt glyph_index ) 1780 { 1781 TT_Face face = (TT_Face)loader->face; 1782#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 1783 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); 1784#endif 1785 1786 FT_BBox bbox; 1787 FT_Fixed y_scale; 1788 TT_GlyphSlot glyph = loader->glyph; 1789 TT_Size size = (TT_Size)loader->size; 1790 1791 1792 y_scale = 0x10000L; 1793 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1794 y_scale = size->root.metrics.y_scale; 1795 1796 if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE ) 1797 FT_Outline_Get_CBox( &glyph->outline, &bbox ); 1798 else 1799 bbox = loader->bbox; 1800 1801 /* get the device-independent horizontal advance; it is scaled later */ 1802 /* by the base layer. */ 1803 glyph->linearHoriAdvance = loader->linear; 1804 1805 glyph->metrics.horiBearingX = bbox.xMin; 1806 glyph->metrics.horiBearingY = bbox.yMax; 1807 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; 1808 1809 /* adjust advance width to the value contained in the hdmx table */ 1810 if ( !face->postscript.isFixedPitch && 1811 IS_HINTED( loader->load_flags ) ) 1812 { 1813 FT_Byte* widthp; 1814 1815 1816 widthp = tt_face_get_device_metrics( face, 1817 size->root.metrics.x_ppem, 1818 glyph_index ); 1819 1820#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 1821 1822 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 1823 { 1824 FT_Bool ignore_x_mode; 1825 1826 1827 ignore_x_mode = FT_BOOL( FT_LOAD_TARGET_MODE( loader->load_flags ) != 1828 FT_RENDER_MODE_MONO ); 1829 1830 if ( widthp && 1831 ( ( ignore_x_mode && loader->exec->compatible_widths ) || 1832 !ignore_x_mode || 1833 SPH_OPTION_BITMAP_WIDTHS ) ) 1834 glyph->metrics.horiAdvance = *widthp << 6; 1835 } 1836 else 1837 1838#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ 1839 1840 { 1841 if ( widthp ) 1842 glyph->metrics.horiAdvance = *widthp << 6; 1843 } 1844 } 1845 1846 /* set glyph dimensions */ 1847 glyph->metrics.width = bbox.xMax - bbox.xMin; 1848 glyph->metrics.height = bbox.yMax - bbox.yMin; 1849 1850 /* Now take care of vertical metrics. In the case where there is */ 1851 /* no vertical information within the font (relatively common), */ 1852 /* create some metrics manually */ 1853 { 1854 FT_Pos top; /* scaled vertical top side bearing */ 1855 FT_Pos advance; /* scaled vertical advance height */ 1856 1857 1858 /* Get the unscaled top bearing and advance height. */ 1859 if ( face->vertical_info && 1860 face->vertical.number_Of_VMetrics > 0 ) 1861 { 1862 top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax, 1863 y_scale ); 1864 1865 if ( loader->pp3.y <= loader->pp4.y ) 1866 advance = 0; 1867 else 1868 advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y, 1869 y_scale ); 1870 } 1871 else 1872 { 1873 FT_Pos height; 1874 1875 1876 /* XXX Compute top side bearing and advance height in */ 1877 /* Get_VMetrics instead of here. */ 1878 1879 /* NOTE: The OS/2 values are the only `portable' ones, */ 1880 /* which is why we use them, if there is an OS/2 */ 1881 /* table in the font. Otherwise, we use the */ 1882 /* values defined in the horizontal header. */ 1883 1884 height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin, 1885 y_scale ); 1886 if ( face->os2.version != 0xFFFFU ) 1887 advance = (FT_Pos)( face->os2.sTypoAscender - 1888 face->os2.sTypoDescender ); 1889 else 1890 advance = (FT_Pos)( face->horizontal.Ascender - 1891 face->horizontal.Descender ); 1892 1893 top = ( advance - height ) / 2; 1894 } 1895 1896#ifdef FT_CONFIG_OPTION_INCREMENTAL 1897 { 1898 FT_Incremental_InterfaceRec* incr; 1899 FT_Incremental_MetricsRec metrics; 1900 FT_Error error; 1901 1902 1903 incr = face->root.internal->incremental_interface; 1904 1905 /* If this is an incrementally loaded font see if there are */ 1906 /* overriding metrics for this glyph. */ 1907 if ( incr && incr->funcs->get_glyph_metrics ) 1908 { 1909 metrics.bearing_x = 0; 1910 metrics.bearing_y = top; 1911 metrics.advance = advance; 1912 1913 error = incr->funcs->get_glyph_metrics( incr->object, 1914 glyph_index, 1915 TRUE, 1916 &metrics ); 1917 if ( error ) 1918 return error; 1919 1920 top = metrics.bearing_y; 1921 advance = metrics.advance; 1922 } 1923 } 1924 1925 /* GWW: Do vertical metrics get loaded incrementally too? */ 1926 1927#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1928 1929 glyph->linearVertAdvance = advance; 1930 1931 /* scale the metrics */ 1932 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1933 { 1934 top = FT_MulFix( top, y_scale ); 1935 advance = FT_MulFix( advance, y_scale ); 1936 } 1937 1938 /* XXX: for now, we have no better algorithm for the lsb, but it */ 1939 /* should work fine. */ 1940 /* */ 1941 glyph->metrics.vertBearingX = glyph->metrics.horiBearingX - 1942 glyph->metrics.horiAdvance / 2; 1943 glyph->metrics.vertBearingY = top; 1944 glyph->metrics.vertAdvance = advance; 1945 } 1946 1947 return 0; 1948 } 1949 1950 1951#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1952 1953 static FT_Error 1954 load_sbit_image( TT_Size size, 1955 TT_GlyphSlot glyph, 1956 FT_UInt glyph_index, 1957 FT_Int32 load_flags ) 1958 { 1959 TT_Face face; 1960 SFNT_Service sfnt; 1961 FT_Stream stream; 1962 FT_Error error; 1963 TT_SBit_MetricsRec metrics; 1964 1965 1966 face = (TT_Face)glyph->face; 1967 sfnt = (SFNT_Service)face->sfnt; 1968 stream = face->root.stream; 1969 1970 error = sfnt->load_sbit_image( face, 1971 size->strike_index, 1972 glyph_index, 1973 (FT_Int)load_flags, 1974 stream, 1975 &glyph->bitmap, 1976 &metrics ); 1977 if ( !error ) 1978 { 1979 glyph->outline.n_points = 0; 1980 glyph->outline.n_contours = 0; 1981 1982 glyph->metrics.width = (FT_Pos)metrics.width << 6; 1983 glyph->metrics.height = (FT_Pos)metrics.height << 6; 1984 1985 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 1986 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 1987 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 1988 1989 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 1990 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 1991 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 1992 1993 glyph->format = FT_GLYPH_FORMAT_BITMAP; 1994 1995 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 1996 { 1997 glyph->bitmap_left = metrics.vertBearingX; 1998 glyph->bitmap_top = metrics.vertBearingY; 1999 } 2000 else 2001 { 2002 glyph->bitmap_left = metrics.horiBearingX; 2003 glyph->bitmap_top = metrics.horiBearingY; 2004 } 2005 } 2006 2007 return error; 2008 } 2009 2010#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 2011 2012 2013 static FT_Error 2014 tt_loader_init( TT_Loader loader, 2015 TT_Size size, 2016 TT_GlyphSlot glyph, 2017 FT_Int32 load_flags, 2018 FT_Bool glyf_table_only ) 2019 { 2020 TT_Face face; 2021 FT_Stream stream; 2022#ifdef TT_USE_BYTECODE_INTERPRETER 2023 FT_Bool pedantic = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); 2024#endif 2025 2026 2027 face = (TT_Face)glyph->face; 2028 stream = face->root.stream; 2029 2030 FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) ); 2031 2032#ifdef TT_USE_BYTECODE_INTERPRETER 2033 2034 /* load execution context */ 2035 if ( IS_HINTED( load_flags ) && !glyf_table_only ) 2036 { 2037 TT_ExecContext exec; 2038 FT_Bool grayscale; 2039 2040#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 2041 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); 2042 2043 FT_Bool subpixel_hinting = FALSE; 2044 FT_Bool grayscale_hinting = TRUE; 2045 2046#if 0 2047 /* not used yet */ 2048 FT_Bool compatible_widths; 2049 FT_Bool symmetrical_smoothing; 2050 FT_Bool bgr; 2051 FT_Bool subpixel_positioned; 2052#endif 2053#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ 2054 2055 FT_Bool reexecute = FALSE; 2056 2057 2058 if ( !size->cvt_ready ) 2059 { 2060 FT_Error error = tt_size_ready_bytecode( size, pedantic ); 2061 2062 2063 if ( error ) 2064 return error; 2065 } 2066 2067 /* query new execution context */ 2068 exec = size->debug ? size->context 2069 : ( (TT_Driver)FT_FACE_DRIVER( face ) )->context; 2070 if ( !exec ) 2071 return FT_THROW( Could_Not_Find_Context ); 2072 2073#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 2074 2075 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 2076 { 2077 subpixel_hinting = FT_BOOL( ( FT_LOAD_TARGET_MODE( load_flags ) 2078 != FT_RENDER_MODE_MONO ) && 2079 SPH_OPTION_SET_SUBPIXEL ); 2080 2081 if ( subpixel_hinting ) 2082 grayscale = grayscale_hinting = FALSE; 2083 else if ( SPH_OPTION_SET_GRAYSCALE ) 2084 { 2085 grayscale = grayscale_hinting = TRUE; 2086 subpixel_hinting = FALSE; 2087 } 2088 else 2089 grayscale = grayscale_hinting = FALSE; 2090 2091 if ( FT_IS_TRICKY( glyph->face ) ) 2092 subpixel_hinting = grayscale_hinting = FALSE; 2093 2094 exec->ignore_x_mode = subpixel_hinting || grayscale_hinting; 2095 exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; 2096 if ( exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 ) 2097 exec->rasterizer_version = TT_INTERPRETER_VERSION_35; 2098 2099#if 1 2100 exec->compatible_widths = SPH_OPTION_SET_COMPATIBLE_WIDTHS; 2101 exec->symmetrical_smoothing = FALSE; 2102 exec->bgr = FALSE; 2103 exec->subpixel_positioned = TRUE; 2104#else /* 0 */ 2105 exec->compatible_widths = 2106 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2107 TT_LOAD_COMPATIBLE_WIDTHS ); 2108 exec->symmetrical_smoothing = 2109 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2110 TT_LOAD_SYMMETRICAL_SMOOTHING ); 2111 exec->bgr = 2112 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2113 TT_LOAD_BGR ); 2114 exec->subpixel_positioned = 2115 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2116 TT_LOAD_SUBPIXEL_POSITIONED ); 2117#endif /* 0 */ 2118 2119 } 2120 else 2121 2122#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ 2123 2124 { 2125 grayscale = FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != 2126 FT_RENDER_MODE_MONO ); 2127 } 2128 2129 TT_Load_Context( exec, face, size ); 2130 2131#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 2132 2133 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) 2134 { 2135 /* a change from mono to subpixel rendering (and vice versa) */ 2136 /* requires a re-execution of the CVT program */ 2137 if ( subpixel_hinting != exec->subpixel_hinting ) 2138 { 2139 FT_TRACE4(( "tt_loader_init: subpixel hinting change," 2140 " re-executing `prep' table\n" )); 2141 2142 exec->subpixel_hinting = subpixel_hinting; 2143 reexecute = TRUE; 2144 } 2145 2146 /* a change from mono to grayscale rendering (and vice versa) */ 2147 /* requires a re-execution of the CVT program */ 2148 if ( grayscale != exec->grayscale_hinting ) 2149 { 2150 FT_TRACE4(( "tt_loader_init: grayscale hinting change," 2151 " re-executing `prep' table\n" )); 2152 2153 exec->grayscale_hinting = grayscale_hinting; 2154 reexecute = TRUE; 2155 } 2156 } 2157 else 2158 2159#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ 2160 2161 { 2162 /* a change from mono to grayscale rendering (and vice versa) */ 2163 /* requires a re-execution of the CVT program */ 2164 if ( grayscale != exec->grayscale ) 2165 { 2166 FT_TRACE4(( "tt_loader_init: grayscale change," 2167 " re-executing `prep' table\n" )); 2168 2169 exec->grayscale = grayscale; 2170 reexecute = TRUE; 2171 } 2172 } 2173 2174 if ( reexecute ) 2175 { 2176 FT_UInt i; 2177 2178 2179 for ( i = 0; i < size->cvt_size; i++ ) 2180 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); 2181 tt_size_run_prep( size, pedantic ); 2182 } 2183 2184 /* see whether the cvt program has disabled hinting */ 2185 if ( exec->GS.instruct_control & 1 ) 2186 load_flags |= FT_LOAD_NO_HINTING; 2187 2188 /* load default graphics state -- if needed */ 2189 if ( exec->GS.instruct_control & 2 ) 2190 exec->GS = tt_default_graphics_state; 2191 2192 exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); 2193 loader->exec = exec; 2194 loader->instructions = exec->glyphIns; 2195 } 2196 2197#endif /* TT_USE_BYTECODE_INTERPRETER */ 2198 2199 /* seek to the beginning of the glyph table -- for Type 42 fonts */ 2200 /* the table might be accessed from a Postscript stream or something */ 2201 /* else... */ 2202 2203#ifdef FT_CONFIG_OPTION_INCREMENTAL 2204 2205 if ( face->root.internal->incremental_interface ) 2206 loader->glyf_offset = 0; 2207 else 2208 2209#endif 2210 2211 { 2212 FT_Error error = face->goto_table( face, TTAG_glyf, stream, 0 ); 2213 2214 2215 if ( FT_ERR_EQ( error, Table_Missing ) ) 2216 loader->glyf_offset = 0; 2217 else if ( error ) 2218 { 2219 FT_ERROR(( "tt_loader_init: could not access glyph table\n" )); 2220 return error; 2221 } 2222 else 2223 loader->glyf_offset = FT_STREAM_POS(); 2224 } 2225 2226 /* get face's glyph loader */ 2227 if ( !glyf_table_only ) 2228 { 2229 FT_GlyphLoader gloader = glyph->internal->loader; 2230 2231 2232 FT_GlyphLoader_Rewind( gloader ); 2233 loader->gloader = gloader; 2234 } 2235 2236 loader->load_flags = load_flags; 2237 2238 loader->face = (FT_Face)face; 2239 loader->size = (FT_Size)size; 2240 loader->glyph = (FT_GlyphSlot)glyph; 2241 loader->stream = stream; 2242 2243 return FT_Err_Ok; 2244 } 2245 2246 2247 /*************************************************************************/ 2248 /* */ 2249 /* <Function> */ 2250 /* TT_Load_Glyph */ 2251 /* */ 2252 /* <Description> */ 2253 /* A function used to load a single glyph within a given glyph slot, */ 2254 /* for a given size. */ 2255 /* */ 2256 /* <Input> */ 2257 /* glyph :: A handle to a target slot object where the glyph */ 2258 /* will be loaded. */ 2259 /* */ 2260 /* size :: A handle to the source face size at which the glyph */ 2261 /* must be scaled/loaded. */ 2262 /* */ 2263 /* glyph_index :: The index of the glyph in the font file. */ 2264 /* */ 2265 /* load_flags :: A flag indicating what to load for this glyph. The */ 2266 /* FT_LOAD_XXX constants can be used to control the */ 2267 /* glyph loading process (e.g., whether the outline */ 2268 /* should be scaled, whether to load bitmaps or not, */ 2269 /* whether to hint the outline, etc). */ 2270 /* */ 2271 /* <Return> */ 2272 /* FreeType error code. 0 means success. */ 2273 /* */ 2274 FT_LOCAL_DEF( FT_Error ) 2275 TT_Load_Glyph( TT_Size size, 2276 TT_GlyphSlot glyph, 2277 FT_UInt glyph_index, 2278 FT_Int32 load_flags ) 2279 { 2280 FT_Error error; 2281 TT_LoaderRec loader; 2282 2283 2284 error = FT_Err_Ok; 2285 2286 FT_TRACE1(( "TT_Load_Glyph: glyph index %d\n", glyph_index )); 2287 2288#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 2289 2290 /* try to load embedded bitmap if any */ 2291 /* */ 2292 /* XXX: The convention should be emphasized in */ 2293 /* the documents because it can be confusing. */ 2294 if ( size->strike_index != 0xFFFFFFFFUL && 2295 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 2296 { 2297 error = load_sbit_image( size, glyph, glyph_index, load_flags ); 2298 if ( !error ) 2299 { 2300 if ( FT_IS_SCALABLE( glyph->face ) ) 2301 { 2302 /* for the bbox we need the header only */ 2303 (void)tt_loader_init( &loader, size, glyph, load_flags, TRUE ); 2304 (void)load_truetype_glyph( &loader, glyph_index, 0, TRUE ); 2305 glyph->linearHoriAdvance = loader.linear; 2306 glyph->linearVertAdvance = loader.top_bearing + loader.bbox.yMax - 2307 loader.vadvance; 2308 2309 /* sanity check: if `horiAdvance' in the sbit metric */ 2310 /* structure isn't set, use `linearHoriAdvance' */ 2311 if ( !glyph->metrics.horiAdvance && glyph->linearHoriAdvance ) 2312 glyph->metrics.horiAdvance = 2313 FT_MulFix( glyph->linearHoriAdvance, 2314 size->root.metrics.x_scale ); 2315 } 2316 2317 return FT_Err_Ok; 2318 } 2319 } 2320 2321#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 2322 2323 /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */ 2324 if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid ) 2325 return FT_THROW( Invalid_Size_Handle ); 2326 2327 if ( load_flags & FT_LOAD_SBITS_ONLY ) 2328 return FT_THROW( Invalid_Argument ); 2329 2330 error = tt_loader_init( &loader, size, glyph, load_flags, FALSE ); 2331 if ( error ) 2332 return error; 2333 2334 glyph->format = FT_GLYPH_FORMAT_OUTLINE; 2335 glyph->num_subglyphs = 0; 2336 glyph->outline.flags = 0; 2337 2338 /* main loading loop */ 2339 error = load_truetype_glyph( &loader, glyph_index, 0, FALSE ); 2340 if ( !error ) 2341 { 2342 if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE ) 2343 { 2344 glyph->num_subglyphs = loader.gloader->base.num_subglyphs; 2345 glyph->subglyphs = loader.gloader->base.subglyphs; 2346 } 2347 else 2348 { 2349 glyph->outline = loader.gloader->base.outline; 2350 glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS; 2351 2352 /* Translate array so that (0,0) is the glyph's origin. Note */ 2353 /* that this behaviour is independent on the value of bit 1 of */ 2354 /* the `flags' field in the `head' table -- at least major */ 2355 /* applications like Acroread indicate that. */ 2356 if ( loader.pp1.x ) 2357 FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 ); 2358 } 2359 2360#ifdef TT_USE_BYTECODE_INTERPRETER 2361 2362 if ( IS_HINTED( load_flags ) ) 2363 { 2364 if ( loader.exec->GS.scan_control ) 2365 { 2366 /* convert scan conversion mode to FT_OUTLINE_XXX flags */ 2367 switch ( loader.exec->GS.scan_type ) 2368 { 2369 case 0: /* simple drop-outs including stubs */ 2370 glyph->outline.flags |= FT_OUTLINE_INCLUDE_STUBS; 2371 break; 2372 case 1: /* simple drop-outs excluding stubs */ 2373 /* nothing; it's the default rendering mode */ 2374 break; 2375 case 4: /* smart drop-outs including stubs */ 2376 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS | 2377 FT_OUTLINE_INCLUDE_STUBS; 2378 break; 2379 case 5: /* smart drop-outs excluding stubs */ 2380 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS; 2381 break; 2382 2383 default: /* no drop-out control */ 2384 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; 2385 break; 2386 } 2387 } 2388 else 2389 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; 2390 } 2391 2392#endif /* TT_USE_BYTECODE_INTERPRETER */ 2393 2394 compute_glyph_metrics( &loader, glyph_index ); 2395 } 2396 2397 /* Set the `high precision' bit flag. */ 2398 /* This is _critical_ to get correct output for monochrome */ 2399 /* TrueType glyphs at all sizes using the bytecode interpreter. */ 2400 /* */ 2401 if ( !( load_flags & FT_LOAD_NO_SCALE ) && 2402 size->root.metrics.y_ppem < 24 ) 2403 glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; 2404 2405 return error; 2406 } 2407 2408 2409/* END */ 2410