ttgload.c revision ffa496574ae715630a466a810986e212d2de59e0
1/***************************************************************************/ 2/* */ 3/* ttgload.c */ 4/* */ 5/* TrueType Glyph Loader (body). */ 6/* */ 7/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by */ 8/* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9/* */ 10/* This file is part of the FreeType project, and may only be used, */ 11/* modified, and distributed under the terms of the FreeType project */ 12/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13/* this file you indicate that you have read the license and */ 14/* understand and accept it fully. */ 15/* */ 16/***************************************************************************/ 17 18 19#include <ft2build.h> 20#include FT_INTERNAL_DEBUG_H 21#include FT_INTERNAL_CALC_H 22#include FT_INTERNAL_STREAM_H 23#include FT_INTERNAL_SFNT_H 24#include FT_TRUETYPE_TAGS_H 25#include FT_OUTLINE_H 26 27#include "ttgload.h" 28#include "ttpload.h" 29 30#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 31#include "ttgxvar.h" 32#endif 33 34#include "tterrors.h" 35 36 37 /*************************************************************************/ 38 /* */ 39 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 40 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 41 /* messages during execution. */ 42 /* */ 43#undef FT_COMPONENT 44#define FT_COMPONENT trace_ttgload 45 46 47 /*************************************************************************/ 48 /* */ 49 /* Composite font flags. */ 50 /* */ 51#define ARGS_ARE_WORDS 0x0001 52#define ARGS_ARE_XY_VALUES 0x0002 53#define ROUND_XY_TO_GRID 0x0004 54#define WE_HAVE_A_SCALE 0x0008 55/* reserved 0x0010 */ 56#define MORE_COMPONENTS 0x0020 57#define WE_HAVE_AN_XY_SCALE 0x0040 58#define WE_HAVE_A_2X2 0x0080 59#define WE_HAVE_INSTR 0x0100 60#define USE_MY_METRICS 0x0200 61#define OVERLAP_COMPOUND 0x0400 62#define SCALED_COMPONENT_OFFSET 0x0800 63#define UNSCALED_COMPONENT_OFFSET 0x1000 64 65 66 /*************************************************************************/ 67 /* */ 68 /* Returns the horizontal metrics in font units for a given glyph. If */ 69 /* `check' is true, take care of monospaced fonts by returning the */ 70 /* advance width maximum. */ 71 /* */ 72 static void 73 Get_HMetrics( TT_Face face, 74 FT_UInt idx, 75 FT_Bool check, 76 FT_Short* lsb, 77 FT_UShort* aw ) 78 { 79 ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw ); 80 81 if ( check && face->postscript.isFixedPitch ) 82 *aw = face->horizontal.advance_Width_Max; 83 } 84 85 86 /*************************************************************************/ 87 /* */ 88 /* Returns the vertical metrics in font units for a given glyph. */ 89 /* Greg Hitchcock from Microsoft told us that if there were no `vmtx' */ 90 /* table, typoAscender/Descender from the `OS/2' table would be used */ 91 /* instead, and if there were no `OS/2' table, use ascender/descender */ 92 /* from the `hhea' table. But that is not what Microsoft's rasterizer */ 93 /* apparently does: It uses the ppem value as the advance height, and */ 94 /* sets the top side bearing to be zero. */ 95 /* */ 96 /* The monospace `check' is probably not meaningful here, but we leave */ 97 /* it in for a consistent interface. */ 98 /* */ 99 static void 100 Get_VMetrics( TT_Face face, 101 FT_UInt idx, 102 FT_Bool check, 103 FT_Short* tsb, 104 FT_UShort* ah ) 105 { 106 FT_UNUSED( check ); 107 108 if ( face->vertical_info ) 109 ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah ); 110 111#if 1 /* Empirically determined, at variance with what MS said */ 112 113 else 114 { 115 *tsb = 0; 116 *ah = face->root.units_per_EM; 117 } 118 119#else /* This is what MS said to do. It isn't what they do, however. */ 120 121 else if ( face->os2.version != 0xFFFFU ) 122 { 123 *tsb = face->os2.sTypoAscender; 124 *ah = face->os2.sTypoAscender - face->os2.sTypoDescender; 125 } 126 else 127 { 128 *tsb = face->horizontal.Ascender; 129 *ah = face->horizontal.Ascender - face->horizontal.Descender; 130 } 131 132#endif 133 134 } 135 136 137 /*************************************************************************/ 138 /* */ 139 /* Translates an array of coordinates. */ 140 /* */ 141 static void 142 translate_array( FT_UInt n, 143 FT_Vector* coords, 144 FT_Pos delta_x, 145 FT_Pos delta_y ) 146 { 147 FT_UInt k; 148 149 150 if ( delta_x ) 151 for ( k = 0; k < n; k++ ) 152 coords[k].x += delta_x; 153 154 if ( delta_y ) 155 for ( k = 0; k < n; k++ ) 156 coords[k].y += delta_y; 157 } 158 159 160#undef IS_HINTED 161#define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 ) 162 163 164 /*************************************************************************/ 165 /* */ 166 /* The following functions are used by default with TrueType fonts. */ 167 /* However, they can be replaced by alternatives if we need to support */ 168 /* TrueType-compressed formats (like MicroType) in the future. */ 169 /* */ 170 /*************************************************************************/ 171 172 FT_CALLBACK_DEF( FT_Error ) 173 TT_Access_Glyph_Frame( TT_Loader loader, 174 FT_UInt glyph_index, 175 FT_ULong offset, 176 FT_UInt byte_count ) 177 { 178 FT_Error error; 179 FT_Stream stream = loader->stream; 180 181 /* for non-debug mode */ 182 FT_UNUSED( glyph_index ); 183 184 185 FT_TRACE5(( "Glyph %ld\n", glyph_index )); 186 187 /* the following line sets the `error' variable through macros! */ 188 if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) ) 189 return error; 190 191 loader->cursor = stream->cursor; 192 loader->limit = stream->limit; 193 194 return TT_Err_Ok; 195 } 196 197 198 FT_CALLBACK_DEF( void ) 199 TT_Forget_Glyph_Frame( TT_Loader loader ) 200 { 201 FT_Stream stream = loader->stream; 202 203 204 FT_FRAME_EXIT(); 205 } 206 207 208 FT_CALLBACK_DEF( FT_Error ) 209 TT_Load_Glyph_Header( TT_Loader loader ) 210 { 211 FT_Byte* p = loader->cursor; 212 FT_Byte* limit = loader->limit; 213 214 215 if ( p + 10 > limit ) 216 return TT_Err_Invalid_Outline; 217 218 loader->n_contours = FT_NEXT_SHORT( p ); 219 220 loader->bbox.xMin = FT_NEXT_SHORT( p ); 221 loader->bbox.yMin = FT_NEXT_SHORT( p ); 222 loader->bbox.xMax = FT_NEXT_SHORT( p ); 223 loader->bbox.yMax = FT_NEXT_SHORT( p ); 224 225 FT_TRACE5(( " # of contours: %d\n", loader->n_contours )); 226 FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin, 227 loader->bbox.xMax )); 228 FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin, 229 loader->bbox.yMax )); 230 loader->cursor = p; 231 232 return TT_Err_Ok; 233 } 234 235 236 FT_CALLBACK_DEF( FT_Error ) 237 TT_Load_Simple_Glyph( TT_Loader load ) 238 { 239 FT_Error error; 240 FT_Byte* p = load->cursor; 241 FT_Byte* limit = load->limit; 242 FT_GlyphLoader gloader = load->gloader; 243 FT_Int n_contours = load->n_contours; 244 FT_Outline* outline; 245 TT_Face face = (TT_Face)load->face; 246 FT_UShort n_ins; 247 FT_Int n_points; 248 249 FT_Byte *flag, *flag_limit; 250 FT_Byte c, count; 251 FT_Vector *vec, *vec_limit; 252 FT_Pos x; 253 FT_Short *cont, *cont_limit, prev_cont; 254 FT_Int xy_size = 0; 255 256 257 /* check that we can add the contours to the glyph */ 258 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours ); 259 if ( error ) 260 goto Fail; 261 262 /* reading the contours' endpoints & number of points */ 263 cont = gloader->current.outline.contours; 264 cont_limit = cont + n_contours; 265 266 /* check space for contours array + instructions count */ 267 if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit ) 268 goto Invalid_Outline; 269 270 prev_cont = FT_NEXT_USHORT( p ); 271 272 if ( n_contours > 0 ) 273 cont[0] = prev_cont; 274 275 for ( cont++; cont < cont_limit; cont++ ) 276 { 277 cont[0] = FT_NEXT_USHORT( p ); 278 if ( cont[0] <= prev_cont ) 279 { 280 /* unordered contours: this is invalid */ 281 error = FT_Err_Invalid_Table; 282 goto Fail; 283 } 284 prev_cont = cont[0]; 285 } 286 287 n_points = 0; 288 if ( n_contours > 0 ) 289 { 290 n_points = cont[-1] + 1; 291 if ( n_points < 0 ) 292 goto Invalid_Outline; 293 } 294 295 /* note that we will add four phantom points later */ 296 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 ); 297 if ( error ) 298 goto Fail; 299 300 /* we'd better check the contours table right now */ 301 outline = &gloader->current.outline; 302 303 for ( cont = outline->contours + 1; cont < cont_limit; cont++ ) 304 if ( cont[-1] >= cont[0] ) 305 goto Invalid_Outline; 306 307 /* reading the bytecode instructions */ 308 load->glyph->control_len = 0; 309 load->glyph->control_data = 0; 310 311 if ( p + 2 > limit ) 312 goto Invalid_Outline; 313 314 n_ins = FT_NEXT_USHORT( p ); 315 316 FT_TRACE5(( " Instructions size: %u\n", n_ins )); 317 318 if ( n_ins > face->max_profile.maxSizeOfInstructions ) 319 { 320 FT_TRACE0(( "TT_Load_Simple_Glyph: Too many instructions (%d)\n", 321 n_ins )); 322 error = TT_Err_Too_Many_Hints; 323 goto Fail; 324 } 325 326 if ( ( limit - p ) < n_ins ) 327 { 328 FT_TRACE0(( "TT_Load_Simple_Glyph: Instruction count mismatch!\n" )); 329 error = TT_Err_Too_Many_Hints; 330 goto Fail; 331 } 332 333#ifdef TT_USE_BYTECODE_INTERPRETER 334 335 if ( IS_HINTED( load->load_flags ) ) 336 { 337 load->glyph->control_len = n_ins; 338 load->glyph->control_data = load->exec->glyphIns; 339 340 FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins ); 341 } 342 343#endif /* TT_USE_BYTECODE_INTERPRETER */ 344 345 p += n_ins; 346 347 /* reading the point tags */ 348 flag = (FT_Byte*)outline->tags; 349 flag_limit = flag + n_points; 350 351 FT_ASSERT( flag != NULL ); 352 353 while ( flag < flag_limit ) 354 { 355 if ( p + 1 > limit ) 356 goto Invalid_Outline; 357 358 *flag++ = c = FT_NEXT_BYTE( p ); 359 if ( c & 8 ) 360 { 361 if ( p + 1 > limit ) 362 goto Invalid_Outline; 363 364 count = FT_NEXT_BYTE( p ); 365 if ( flag + (FT_Int)count > flag_limit ) 366 goto Invalid_Outline; 367 368 for ( ; count > 0; count-- ) 369 *flag++ = c; 370 } 371 } 372 373 /* reading the X coordinates */ 374 375 vec = outline->points; 376 vec_limit = vec + n_points; 377 flag = (FT_Byte*)outline->tags; 378 x = 0; 379 380 if ( p + xy_size > limit ) 381 goto Invalid_Outline; 382 383 for ( ; vec < vec_limit; vec++, flag++ ) 384 { 385 FT_Pos y = 0; 386 FT_Byte f = *flag; 387 388 389 if ( f & 2 ) 390 { 391 if ( p + 1 > limit ) 392 goto Invalid_Outline; 393 394 y = (FT_Pos)FT_NEXT_BYTE( p ); 395 if ( ( f & 16 ) == 0 ) 396 y = -y; 397 } 398 else if ( ( f & 16 ) == 0 ) 399 { 400 if ( p + 2 > limit ) 401 goto Invalid_Outline; 402 403 y = (FT_Pos)FT_NEXT_SHORT( p ); 404 } 405 406 x += y; 407 vec->x = x; 408 *flag = f & ~( 2 | 16 ); 409 } 410 411 /* reading the Y coordinates */ 412 413 vec = gloader->current.outline.points; 414 vec_limit = vec + n_points; 415 flag = (FT_Byte*)outline->tags; 416 x = 0; 417 418 for ( ; vec < vec_limit; vec++, flag++ ) 419 { 420 FT_Pos y = 0; 421 FT_Byte f = *flag; 422 423 424 if ( f & 4 ) 425 { 426 if ( p + 1 > limit ) 427 goto Invalid_Outline; 428 429 y = (FT_Pos)FT_NEXT_BYTE( p ); 430 if ( ( f & 32 ) == 0 ) 431 y = -y; 432 } 433 else if ( ( f & 32 ) == 0 ) 434 { 435 if ( p + 2 > limit ) 436 goto Invalid_Outline; 437 438 y = (FT_Pos)FT_NEXT_SHORT( p ); 439 } 440 441 x += y; 442 vec->y = x; 443 *flag = f & FT_CURVE_TAG_ON; 444 } 445 446 outline->n_points = (FT_UShort)n_points; 447 outline->n_contours = (FT_Short) n_contours; 448 449 load->cursor = p; 450 451 Fail: 452 return error; 453 454 Invalid_Outline: 455 error = TT_Err_Invalid_Outline; 456 goto Fail; 457 } 458 459 460 FT_CALLBACK_DEF( FT_Error ) 461 TT_Load_Composite_Glyph( TT_Loader loader ) 462 { 463 FT_Error error; 464 FT_Byte* p = loader->cursor; 465 FT_Byte* limit = loader->limit; 466 FT_GlyphLoader gloader = loader->gloader; 467 FT_SubGlyph subglyph; 468 FT_UInt num_subglyphs; 469 470 471 num_subglyphs = 0; 472 473 do 474 { 475 FT_Fixed xx, xy, yy, yx; 476 FT_UInt count; 477 478 479 /* check that we can load a new subglyph */ 480 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 ); 481 if ( error ) 482 goto Fail; 483 484 /* check space */ 485 if ( p + 4 > limit ) 486 goto Invalid_Composite; 487 488 subglyph = gloader->current.subglyphs + num_subglyphs; 489 490 subglyph->arg1 = subglyph->arg2 = 0; 491 492 subglyph->flags = FT_NEXT_USHORT( p ); 493 subglyph->index = FT_NEXT_USHORT( p ); 494 495 /* check space */ 496 count = 2; 497 if ( subglyph->flags & ARGS_ARE_WORDS ) 498 count += 2; 499 if ( subglyph->flags & WE_HAVE_A_SCALE ) 500 count += 2; 501 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 502 count += 4; 503 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 504 count += 8; 505 506 if ( p + count > limit ) 507 goto Invalid_Composite; 508 509 /* read arguments */ 510 if ( subglyph->flags & ARGS_ARE_WORDS ) 511 { 512 subglyph->arg1 = FT_NEXT_SHORT( p ); 513 subglyph->arg2 = FT_NEXT_SHORT( p ); 514 } 515 else 516 { 517 subglyph->arg1 = FT_NEXT_CHAR( p ); 518 subglyph->arg2 = FT_NEXT_CHAR( p ); 519 } 520 521 /* read transform */ 522 xx = yy = 0x10000L; 523 xy = yx = 0; 524 525 if ( subglyph->flags & WE_HAVE_A_SCALE ) 526 { 527 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 528 yy = xx; 529 } 530 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 531 { 532 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 533 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 534 } 535 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 536 { 537 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 538 yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 539 xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 540 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 541 } 542 543 subglyph->transform.xx = xx; 544 subglyph->transform.xy = xy; 545 subglyph->transform.yx = yx; 546 subglyph->transform.yy = yy; 547 548 num_subglyphs++; 549 550 } while ( subglyph->flags & MORE_COMPONENTS ); 551 552 gloader->current.num_subglyphs = num_subglyphs; 553 554#ifdef TT_USE_BYTECODE_INTERPRETER 555 556 { 557 FT_Stream stream = loader->stream; 558 559 560 /* we must undo the FT_FRAME_ENTER in order to point to the */ 561 /* composite instructions, if we find some. */ 562 /* we will process them later... */ 563 /* */ 564 loader->ins_pos = (FT_ULong)( FT_STREAM_POS() + 565 p - limit ); 566 } 567 568#endif 569 570 loader->cursor = p; 571 572 Fail: 573 return error; 574 575 Invalid_Composite: 576 error = TT_Err_Invalid_Composite; 577 goto Fail; 578 } 579 580 581 FT_LOCAL_DEF( void ) 582 TT_Init_Glyph_Loading( TT_Face face ) 583 { 584 face->access_glyph_frame = TT_Access_Glyph_Frame; 585 face->read_glyph_header = TT_Load_Glyph_Header; 586 face->read_simple_glyph = TT_Load_Simple_Glyph; 587 face->read_composite_glyph = TT_Load_Composite_Glyph; 588 face->forget_glyph_frame = TT_Forget_Glyph_Frame; 589 } 590 591 592 static void 593 tt_prepare_zone( TT_GlyphZone zone, 594 FT_GlyphLoad load, 595 FT_UInt start_point, 596 FT_UInt start_contour ) 597 { 598 zone->n_points = (FT_UShort)( load->outline.n_points - start_point ); 599 zone->n_contours = (FT_Short) ( load->outline.n_contours - 600 start_contour ); 601 zone->org = load->extra_points + start_point; 602 zone->cur = load->outline.points + start_point; 603 zone->orus = load->extra_points2 + start_point; 604 zone->tags = (FT_Byte*)load->outline.tags + start_point; 605 zone->contours = (FT_UShort*)load->outline.contours + start_contour; 606 zone->first_point = (FT_UShort)start_point; 607 } 608 609 610 /*************************************************************************/ 611 /* */ 612 /* <Function> */ 613 /* TT_Hint_Glyph */ 614 /* */ 615 /* <Description> */ 616 /* Hint the glyph using the zone prepared by the caller. Note that */ 617 /* the zone is supposed to include four phantom points. */ 618 /* */ 619 static FT_Error 620 TT_Hint_Glyph( TT_Loader loader, 621 FT_Bool is_composite ) 622 { 623 TT_GlyphZone zone = &loader->zone; 624 FT_Pos origin; 625 626#ifdef TT_USE_BYTECODE_INTERPRETER 627 FT_UInt n_ins; 628#else 629 FT_UNUSED( is_composite ); 630#endif 631 632 633#ifdef TT_USE_BYTECODE_INTERPRETER 634 n_ins = loader->glyph->control_len; 635#endif 636 637 origin = zone->cur[zone->n_points - 4].x; 638 origin = FT_PIX_ROUND( origin ) - origin; 639 if ( origin ) 640 translate_array( zone->n_points, zone->cur, origin, 0 ); 641 642#ifdef TT_USE_BYTECODE_INTERPRETER 643 /* save original point position in org */ 644 if ( n_ins > 0 ) 645 FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points ); 646 647 /* Reset graphics state. */ 648 loader->exec->GS = ((TT_Size)loader->size)->GS; 649 650 /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */ 651 /* completely refer to the (already) hinted subglyphs. */ 652 if ( is_composite ) 653 { 654 loader->exec->metrics.x_scale = 1 << 16; 655 loader->exec->metrics.y_scale = 1 << 16; 656 657 FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points ); 658 } 659 else 660 { 661 loader->exec->metrics.x_scale = loader->size->metrics.x_scale; 662 loader->exec->metrics.y_scale = loader->size->metrics.y_scale; 663 } 664#endif 665 666 /* round pp2 and pp4 */ 667 zone->cur[zone->n_points - 3].x = 668 FT_PIX_ROUND( zone->cur[zone->n_points - 3].x ); 669 zone->cur[zone->n_points - 1].y = 670 FT_PIX_ROUND( zone->cur[zone->n_points - 1].y ); 671 672#ifdef TT_USE_BYTECODE_INTERPRETER 673 674 if ( n_ins > 0 ) 675 { 676 FT_Bool debug; 677 FT_Error error; 678 679 680 error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph, 681 loader->exec->glyphIns, n_ins ); 682 if ( error ) 683 return error; 684 685 loader->exec->is_composite = is_composite; 686 loader->exec->pts = *zone; 687 688 debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) && 689 ((TT_Size)loader->size)->debug ); 690 691 error = TT_Run_Context( loader->exec, debug ); 692 if ( error && loader->exec->pedantic_hinting ) 693 return error; 694 } 695 696#endif 697 698 /* save glyph phantom points */ 699 if ( !loader->preserve_pps ) 700 { 701 loader->pp1 = zone->cur[zone->n_points - 4]; 702 loader->pp2 = zone->cur[zone->n_points - 3]; 703 loader->pp3 = zone->cur[zone->n_points - 2]; 704 loader->pp4 = zone->cur[zone->n_points - 1]; 705 } 706 707 return TT_Err_Ok; 708 } 709 710 711 /*************************************************************************/ 712 /* */ 713 /* <Function> */ 714 /* TT_Process_Simple_Glyph */ 715 /* */ 716 /* <Description> */ 717 /* Once a simple glyph has been loaded, it needs to be processed. */ 718 /* Usually, this means scaling and hinting through bytecode */ 719 /* interpretation. */ 720 /* */ 721 static FT_Error 722 TT_Process_Simple_Glyph( TT_Loader loader ) 723 { 724 FT_GlyphLoader gloader = loader->gloader; 725 FT_Error error = TT_Err_Ok; 726 FT_Outline* outline; 727 FT_Int n_points; 728 729 730 outline = &gloader->current.outline; 731 n_points = outline->n_points; 732 733 /* set phantom points */ 734 735 outline->points[n_points ] = loader->pp1; 736 outline->points[n_points + 1] = loader->pp2; 737 outline->points[n_points + 2] = loader->pp3; 738 outline->points[n_points + 3] = loader->pp4; 739 740 outline->tags[n_points ] = 0; 741 outline->tags[n_points + 1] = 0; 742 outline->tags[n_points + 2] = 0; 743 outline->tags[n_points + 3] = 0; 744 745 n_points += 4; 746 747#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 748 749 if ( ((TT_Face)loader->face)->doblend ) 750 { 751 /* Deltas apply to the unscaled data. */ 752 FT_Vector* deltas; 753 FT_Memory memory = loader->face->memory; 754 FT_Int i; 755 756 757 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), 758 loader->glyph_index, 759 &deltas, 760 n_points ); 761 if ( error ) 762 return error; 763 764 for ( i = 0; i < n_points; ++i ) 765 { 766 outline->points[i].x += deltas[i].x; 767 outline->points[i].y += deltas[i].y; 768 } 769 770 FT_FREE( deltas ); 771 } 772 773#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 774 775 if ( IS_HINTED( loader->load_flags ) ) 776 { 777 tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 ); 778 779 FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur, 780 loader->zone.n_points + 4 ); 781 } 782 783 /* scale the glyph */ 784 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 785 { 786 FT_Vector* vec = outline->points; 787 FT_Vector* limit = outline->points + n_points; 788 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; 789 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; 790 791 792 for ( ; vec < limit; vec++ ) 793 { 794 vec->x = FT_MulFix( vec->x, x_scale ); 795 vec->y = FT_MulFix( vec->y, y_scale ); 796 } 797 798 loader->pp1 = outline->points[n_points - 4]; 799 loader->pp2 = outline->points[n_points - 3]; 800 loader->pp3 = outline->points[n_points - 2]; 801 loader->pp4 = outline->points[n_points - 1]; 802 } 803 804 if ( IS_HINTED( loader->load_flags ) ) 805 { 806 loader->zone.n_points += 4; 807 808 error = TT_Hint_Glyph( loader, 0 ); 809 } 810 811 return error; 812 } 813 814 815 /*************************************************************************/ 816 /* */ 817 /* <Function> */ 818 /* TT_Process_Composite_Component */ 819 /* */ 820 /* <Description> */ 821 /* Once a composite component has been loaded, it needs to be */ 822 /* processed. Usually, this means transforming and translating. */ 823 /* */ 824 static FT_Error 825 TT_Process_Composite_Component( TT_Loader loader, 826 FT_SubGlyph subglyph, 827 FT_UInt start_point, 828 FT_UInt num_base_points ) 829 { 830 FT_GlyphLoader gloader = loader->gloader; 831 FT_Vector* base_vec = gloader->base.outline.points; 832 FT_UInt num_points = gloader->base.outline.n_points; 833 FT_Bool have_scale; 834 FT_Pos x, y; 835 836 837 have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE | 838 WE_HAVE_AN_XY_SCALE | 839 WE_HAVE_A_2X2 ) ); 840 841 /* perform the transform required for this subglyph */ 842 if ( have_scale ) 843 { 844 FT_UInt i; 845 846 847 for ( i = num_base_points; i < num_points; i++ ) 848 FT_Vector_Transform( base_vec + i, &subglyph->transform ); 849 } 850 851 /* get offset */ 852 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) 853 { 854 FT_UInt k = subglyph->arg1; 855 FT_UInt l = subglyph->arg2; 856 FT_Vector* p1; 857 FT_Vector* p2; 858 859 860 /* match l-th point of the newly loaded component to the k-th point */ 861 /* of the previously loaded components. */ 862 863 /* change to the point numbers used by our outline */ 864 k += start_point; 865 l += num_base_points; 866 if ( k >= num_base_points || 867 l >= num_points ) 868 return TT_Err_Invalid_Composite; 869 870 p1 = gloader->base.outline.points + k; 871 p2 = gloader->base.outline.points + l; 872 873 x = p1->x - p2->x; 874 y = p1->y - p2->y; 875 } 876 else 877 { 878 x = subglyph->arg1; 879 y = subglyph->arg2; 880 881 if ( !x && !y ) 882 return TT_Err_Ok; 883 884 /* Use a default value dependent on */ 885 /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */ 886 /* fonts which don't set the xxx_COMPONENT_OFFSET bit. */ 887 888 if ( have_scale && 889#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED 890 !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) ) 891#else 892 ( subglyph->flags & SCALED_COMPONENT_OFFSET ) ) 893#endif 894 { 895 896#if 0 897 898 /*************************************************************************/ 899 /* */ 900 /* This algorithm is what Apple documents. But it doesn't work. */ 901 /* */ 902 int a = subglyph->transform.xx > 0 ? subglyph->transform.xx 903 : -subglyph->transform.xx; 904 int b = subglyph->transform.yx > 0 ? subglyph->transform.yx 905 : -subglyph->transform.yx; 906 int c = subglyph->transform.xy > 0 ? subglyph->transform.xy 907 : -subglyph->transform.xy; 908 int d = subglyph->transform.yy > 0 ? subglyph->transform.yy 909 : -subglyph->transform.yy; 910 int m = a > b ? a : b; 911 int n = c > d ? c : d; 912 913 914 if ( a - b <= 33 && a - b >= -33 ) 915 m *= 2; 916 if ( c - d <= 33 && c - d >= -33 ) 917 n *= 2; 918 x = FT_MulFix( x, m ); 919 y = FT_MulFix( y, n ); 920 921#else /* 0 */ 922 923 /*************************************************************************/ 924 /* */ 925 /* This algorithm is a guess and works much better than the above. */ 926 /* */ 927 FT_Fixed mac_xscale = FT_SqrtFixed( 928 FT_MulFix( subglyph->transform.xx, 929 subglyph->transform.xx ) + 930 FT_MulFix( subglyph->transform.xy, 931 subglyph->transform.xy ) ); 932 FT_Fixed mac_yscale = FT_SqrtFixed( 933 FT_MulFix( subglyph->transform.yy, 934 subglyph->transform.yy ) + 935 FT_MulFix( subglyph->transform.yx, 936 subglyph->transform.yx ) ); 937 938 939 x = FT_MulFix( x, mac_xscale ); 940 y = FT_MulFix( y, mac_yscale ); 941 942#endif /* 0 */ 943 944 } 945 946 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 947 { 948 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; 949 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; 950 951 952 x = FT_MulFix( x, x_scale ); 953 y = FT_MulFix( y, y_scale ); 954 955 if ( subglyph->flags & ROUND_XY_TO_GRID ) 956 { 957 x = FT_PIX_ROUND( x ); 958 y = FT_PIX_ROUND( y ); 959 } 960 } 961 } 962 963 if ( x || y ) 964 translate_array( num_points - num_base_points, 965 base_vec + num_base_points, 966 x, y ); 967 968 return TT_Err_Ok; 969 } 970 971 972 /*************************************************************************/ 973 /* */ 974 /* <Function> */ 975 /* TT_Process_Composite_Glyph */ 976 /* */ 977 /* <Description> */ 978 /* This is slightly different from TT_Process_Simple_Glyph, in that */ 979 /* its sole purpose is to hint the glyph. Thus this function is */ 980 /* only available when bytecode interpreter is enabled. */ 981 /* */ 982 static FT_Error 983 TT_Process_Composite_Glyph( TT_Loader loader, 984 FT_UInt start_point, 985 FT_UInt start_contour ) 986 { 987 FT_Error error; 988 FT_Outline* outline; 989 FT_UInt i; 990 991 992 outline = &loader->gloader->base.outline; 993 994 /* make room for phantom points */ 995 error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader, 996 outline->n_points + 4, 997 0 ); 998 if ( error ) 999 return error; 1000 1001 outline->points[outline->n_points ] = loader->pp1; 1002 outline->points[outline->n_points + 1] = loader->pp2; 1003 outline->points[outline->n_points + 2] = loader->pp3; 1004 outline->points[outline->n_points + 3] = loader->pp4; 1005 1006 outline->tags[outline->n_points ] = 0; 1007 outline->tags[outline->n_points + 1] = 0; 1008 outline->tags[outline->n_points + 2] = 0; 1009 outline->tags[outline->n_points + 3] = 0; 1010 1011#ifdef TT_USE_BYTECODE_INTERPRETER 1012 1013 { 1014 FT_Stream stream = loader->stream; 1015 FT_UShort n_ins; 1016 1017 1018 /* TT_Load_Composite_Glyph only gives us the offset of instructions */ 1019 /* so we read them here */ 1020 if ( FT_STREAM_SEEK( loader->ins_pos ) || 1021 FT_READ_USHORT( n_ins ) ) 1022 return error; 1023 1024 FT_TRACE5(( " Instructions size = %d\n", n_ins )); 1025 1026 /* check it */ 1027 if ( n_ins > ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions ) 1028 { 1029 FT_TRACE0(( "TT_Process_Composite_Glyph: Too many instructions (%d)\n", 1030 n_ins )); 1031 1032 return TT_Err_Too_Many_Hints; 1033 } 1034 else if ( n_ins == 0 ) 1035 return TT_Err_Ok; 1036 1037 if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) ) 1038 return error; 1039 1040 loader->glyph->control_data = loader->exec->glyphIns; 1041 loader->glyph->control_len = n_ins; 1042 } 1043 1044#endif 1045 1046 tt_prepare_zone( &loader->zone, &loader->gloader->base, 1047 start_point, start_contour ); 1048 1049 /* Some points are likely touched during execution of */ 1050 /* instructions on components. So let's untouch them. */ 1051 for ( i = start_point; i < loader->zone.n_points; i++ ) 1052 loader->zone.tags[i] &= ~( FT_CURVE_TAG_TOUCH_X | 1053 FT_CURVE_TAG_TOUCH_Y ); 1054 1055 loader->zone.n_points += 4; 1056 1057 return TT_Hint_Glyph( loader, 1 ); 1058 } 1059 1060 1061 /* Calculate the four phantom points. */ 1062 /* The first two stand for horizontal origin and advance. */ 1063 /* The last two stand for vertical origin and advance. */ 1064#define TT_LOADER_SET_PP( loader ) \ 1065 do { \ 1066 (loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \ 1067 (loader)->pp1.y = 0; \ 1068 (loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \ 1069 (loader)->pp2.y = 0; \ 1070 (loader)->pp3.x = 0; \ 1071 (loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax; \ 1072 (loader)->pp4.x = 0; \ 1073 (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \ 1074 } while ( 0 ) 1075 1076 1077 /*************************************************************************/ 1078 /* */ 1079 /* <Function> */ 1080 /* load_truetype_glyph */ 1081 /* */ 1082 /* <Description> */ 1083 /* Loads a given truetype glyph. Handles composites and uses a */ 1084 /* TT_Loader object. */ 1085 /* */ 1086 static FT_Error 1087 load_truetype_glyph( TT_Loader loader, 1088 FT_UInt glyph_index, 1089 FT_UInt recurse_count ) 1090 { 1091 FT_Error error; 1092 FT_Fixed x_scale, y_scale; 1093 FT_ULong offset; 1094 TT_Face face = (TT_Face)loader->face; 1095 FT_GlyphLoader gloader = loader->gloader; 1096 FT_Bool opened_frame = 0; 1097 1098#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1099 FT_Vector* deltas = NULL; 1100#endif 1101 1102#ifdef FT_CONFIG_OPTION_INCREMENTAL 1103 FT_StreamRec inc_stream; 1104 FT_Data glyph_data; 1105 FT_Bool glyph_data_loaded = 0; 1106#endif 1107 1108 1109 /* some fonts have an incorrect value of `maxComponentDepth', */ 1110 /* thus we allow depth 1 to catch the majority of them */ 1111 if ( recurse_count > 1 && 1112 recurse_count > face->max_profile.maxComponentDepth ) 1113 { 1114 error = TT_Err_Invalid_Composite; 1115 goto Exit; 1116 } 1117 1118 /* check glyph index */ 1119 if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) 1120 { 1121 error = TT_Err_Invalid_Glyph_Index; 1122 goto Exit; 1123 } 1124 1125 loader->glyph_index = glyph_index; 1126 1127 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1128 { 1129 x_scale = ((TT_Size)loader->size)->metrics.x_scale; 1130 y_scale = ((TT_Size)loader->size)->metrics.y_scale; 1131 } 1132 else 1133 { 1134 x_scale = 0x10000L; 1135 y_scale = 0x10000L; 1136 } 1137 1138 /* get metrics, horizontal and vertical */ 1139 { 1140 FT_Short left_bearing = 0, top_bearing = 0; 1141 FT_UShort advance_width = 0, advance_height = 0; 1142 1143 1144 Get_HMetrics( face, glyph_index, 1145 (FT_Bool)!( loader->load_flags & 1146 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), 1147 &left_bearing, 1148 &advance_width ); 1149 Get_VMetrics( face, glyph_index, 1150 (FT_Bool)!( loader->load_flags & 1151 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), 1152 &top_bearing, 1153 &advance_height ); 1154 1155#ifdef FT_CONFIG_OPTION_INCREMENTAL 1156 1157 /* If this is an incrementally loaded font see if there are */ 1158 /* overriding metrics for this glyph. */ 1159 if ( face->root.internal->incremental_interface && 1160 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 1161 { 1162 FT_Incremental_MetricsRec metrics; 1163 1164 1165 metrics.bearing_x = left_bearing; 1166 metrics.bearing_y = 0; 1167 metrics.advance = advance_width; 1168 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 1169 face->root.internal->incremental_interface->object, 1170 glyph_index, FALSE, &metrics ); 1171 if ( error ) 1172 goto Exit; 1173 left_bearing = (FT_Short)metrics.bearing_x; 1174 advance_width = (FT_UShort)metrics.advance; 1175 1176#if 0 1177 1178 /* GWW: Do I do the same for vertical metrics? */ 1179 metrics.bearing_x = 0; 1180 metrics.bearing_y = top_bearing; 1181 metrics.advance = advance_height; 1182 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 1183 face->root.internal->incremental_interface->object, 1184 glyph_index, TRUE, &metrics ); 1185 if ( error ) 1186 goto Exit; 1187 top_bearing = (FT_Short)metrics.bearing_y; 1188 advance_height = (FT_UShort)metrics.advance; 1189 1190#endif /* 0 */ 1191 1192 } 1193 1194#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1195 1196 loader->left_bearing = left_bearing; 1197 loader->advance = advance_width; 1198 loader->top_bearing = top_bearing; 1199 loader->vadvance = advance_height; 1200 1201 if ( !loader->linear_def ) 1202 { 1203 loader->linear_def = 1; 1204 loader->linear = advance_width; 1205 } 1206 } 1207 1208 /* Set `offset' to the start of the glyph relative to the start of */ 1209 /* the `glyf' table, and `byte_len' to the length of the glyph in */ 1210 /* bytes. */ 1211 1212#ifdef FT_CONFIG_OPTION_INCREMENTAL 1213 1214 /* If we are loading glyph data via the incremental interface, set */ 1215 /* the loader stream to a memory stream reading the data returned */ 1216 /* by the interface. */ 1217 if ( face->root.internal->incremental_interface ) 1218 { 1219 error = face->root.internal->incremental_interface->funcs->get_glyph_data( 1220 face->root.internal->incremental_interface->object, 1221 glyph_index, &glyph_data ); 1222 if ( error ) 1223 goto Exit; 1224 1225 glyph_data_loaded = 1; 1226 offset = 0; 1227 loader->byte_len = glyph_data.length; 1228 1229 FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) ); 1230 FT_Stream_OpenMemory( &inc_stream, 1231 glyph_data.pointer, glyph_data.length ); 1232 1233 loader->stream = &inc_stream; 1234 } 1235 else 1236 1237#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1238 1239 offset = tt_face_get_location( face, glyph_index, 1240 (FT_UInt*)&loader->byte_len ); 1241 1242 if ( loader->byte_len > 0 ) 1243 { 1244 error = face->access_glyph_frame( loader, glyph_index, 1245 loader->glyf_offset + offset, 1246 loader->byte_len ); 1247 if ( error ) 1248 goto Exit; 1249 1250 opened_frame = 1; 1251 1252 /* read first glyph header */ 1253 error = face->read_glyph_header( loader ); 1254 if ( error ) 1255 goto Exit; 1256 } 1257 1258 if ( loader->byte_len == 0 || loader->n_contours == 0 ) 1259 { 1260 loader->bbox.xMin = 0; 1261 loader->bbox.xMax = 0; 1262 loader->bbox.yMin = 0; 1263 loader->bbox.yMax = 0; 1264 1265 TT_LOADER_SET_PP( loader ); 1266 1267#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1268 1269 if ( ((TT_Face)(loader->face))->doblend ) 1270 { 1271 /* this must be done before scaling */ 1272 FT_Memory memory = loader->face->memory; 1273 1274 1275 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), 1276 glyph_index, &deltas, 4 ); 1277 if ( error ) 1278 goto Exit; 1279 1280 loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y; 1281 loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y; 1282 loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y; 1283 loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y; 1284 1285 FT_FREE( deltas ); 1286 } 1287 1288#endif 1289 1290 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1291 { 1292 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1293 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1294 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1295 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1296 } 1297 1298 error = TT_Err_Ok; 1299 goto Exit; 1300 } 1301 1302 TT_LOADER_SET_PP( loader ); 1303 1304 /***********************************************************************/ 1305 /***********************************************************************/ 1306 /***********************************************************************/ 1307 1308 /* if it is a simple glyph, load it */ 1309 1310 if ( loader->n_contours > 0 ) 1311 { 1312 error = face->read_simple_glyph( loader ); 1313 if ( error ) 1314 goto Exit; 1315 1316 /* all data have been read */ 1317 face->forget_glyph_frame( loader ); 1318 opened_frame = 0; 1319 1320 error = TT_Process_Simple_Glyph( loader ); 1321 if ( error ) 1322 goto Exit; 1323 1324 FT_GlyphLoader_Add( gloader ); 1325 } 1326 1327 /***********************************************************************/ 1328 /***********************************************************************/ 1329 /***********************************************************************/ 1330 1331 /* otherwise, load a composite! */ 1332 else if ( loader->n_contours == -1 ) 1333 { 1334 FT_UInt start_point; 1335 FT_UInt start_contour; 1336 FT_ULong ins_pos; /* position of composite instructions, if any */ 1337 1338 1339 start_point = gloader->base.outline.n_points; 1340 start_contour = gloader->base.outline.n_contours; 1341 1342 /* for each subglyph, read composite header */ 1343 error = face->read_composite_glyph( loader ); 1344 if ( error ) 1345 goto Exit; 1346 1347 /* store the offset of instructions */ 1348 ins_pos = loader->ins_pos; 1349 1350 /* all data we need are read */ 1351 face->forget_glyph_frame( loader ); 1352 opened_frame = 0; 1353 1354#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1355 1356 if ( face->doblend ) 1357 { 1358 FT_Int i, limit; 1359 FT_SubGlyph subglyph; 1360 FT_Memory memory = face->root.memory; 1361 1362 1363 /* this provides additional offsets */ 1364 /* for each component's translation */ 1365 1366 if ( ( error = TT_Vary_Get_Glyph_Deltas( 1367 face, 1368 glyph_index, 1369 &deltas, 1370 gloader->current.num_subglyphs + 4 )) != 0 ) 1371 goto Exit; 1372 1373 subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs; 1374 limit = gloader->current.num_subglyphs; 1375 1376 for ( i = 0; i < limit; ++i, ++subglyph ) 1377 { 1378 if ( subglyph->flags & ARGS_ARE_XY_VALUES ) 1379 { 1380 subglyph->arg1 += deltas[i].x; 1381 subglyph->arg2 += deltas[i].y; 1382 } 1383 } 1384 1385 loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y; 1386 loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y; 1387 loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y; 1388 loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y; 1389 1390 FT_FREE( deltas ); 1391 } 1392 1393#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 1394 1395 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1396 { 1397 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1398 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1399 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1400 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1401 } 1402 1403 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ 1404 /* `as is' in the glyph slot (the client application will be */ 1405 /* responsible for interpreting these data)... */ 1406 if ( loader->load_flags & FT_LOAD_NO_RECURSE ) 1407 { 1408 FT_GlyphLoader_Add( gloader ); 1409 loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE; 1410 1411 goto Exit; 1412 } 1413 1414 /*********************************************************************/ 1415 /*********************************************************************/ 1416 /*********************************************************************/ 1417 1418 { 1419 FT_UInt n, num_base_points; 1420 FT_SubGlyph subglyph = 0; 1421 1422 FT_UInt num_points = start_point; 1423 FT_UInt num_subglyphs = gloader->current.num_subglyphs; 1424 FT_UInt num_base_subgs = gloader->base.num_subglyphs; 1425 1426 FT_Stream old_stream = loader->stream; 1427 1428 1429 FT_GlyphLoader_Add( gloader ); 1430 1431 /* read each subglyph independently */ 1432 for ( n = 0; n < num_subglyphs; n++ ) 1433 { 1434 FT_Vector pp[4]; 1435 1436 1437 /* Each time we call load_truetype_glyph in this loop, the */ 1438 /* value of `gloader.base.subglyphs' can change due to table */ 1439 /* reallocations. We thus need to recompute the subglyph */ 1440 /* pointer on each iteration. */ 1441 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1442 1443 pp[0] = loader->pp1; 1444 pp[1] = loader->pp2; 1445 pp[2] = loader->pp3; 1446 pp[3] = loader->pp4; 1447 1448 num_base_points = gloader->base.outline.n_points; 1449 1450 error = load_truetype_glyph( loader, subglyph->index, 1451 recurse_count + 1 ); 1452 if ( error ) 1453 goto Exit; 1454 1455 /* restore subglyph pointer */ 1456 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1457 1458 if ( !( subglyph->flags & USE_MY_METRICS ) ) 1459 { 1460 loader->pp1 = pp[0]; 1461 loader->pp2 = pp[1]; 1462 loader->pp3 = pp[2]; 1463 loader->pp4 = pp[3]; 1464 } 1465 1466 num_points = gloader->base.outline.n_points; 1467 1468 if ( num_points == num_base_points ) 1469 continue; 1470 1471 /* gloader->base.outline consists of three parts: */ 1472 /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */ 1473 /* */ 1474 /* (1): exists from the beginning */ 1475 /* (2): components that have been loaded so far */ 1476 /* (3): the newly loaded component */ 1477 TT_Process_Composite_Component( loader, subglyph, start_point, 1478 num_base_points ); 1479 } 1480 1481 loader->stream = old_stream; 1482 1483 /* process the glyph */ 1484 loader->ins_pos = ins_pos; 1485 if ( IS_HINTED( loader->load_flags ) && 1486 1487#ifdef TT_USE_BYTECODE_INTERPRETER 1488 1489 subglyph->flags & WE_HAVE_INSTR && 1490 1491#endif 1492 1493 num_points > start_point ) 1494 TT_Process_Composite_Glyph( loader, start_point, start_contour ); 1495 1496 } 1497 } 1498 else 1499 { 1500 /* invalid composite count (negative but not -1) */ 1501 error = TT_Err_Invalid_Outline; 1502 goto Exit; 1503 } 1504 1505 /***********************************************************************/ 1506 /***********************************************************************/ 1507 /***********************************************************************/ 1508 1509 Exit: 1510 1511 if ( opened_frame ) 1512 face->forget_glyph_frame( loader ); 1513 1514#ifdef FT_CONFIG_OPTION_INCREMENTAL 1515 1516 if ( glyph_data_loaded ) 1517 face->root.internal->incremental_interface->funcs->free_glyph_data( 1518 face->root.internal->incremental_interface->object, 1519 &glyph_data ); 1520 1521#endif 1522 1523 return error; 1524 } 1525 1526 1527 static FT_Error 1528 compute_glyph_metrics( TT_Loader loader, 1529 FT_UInt glyph_index ) 1530 { 1531 FT_BBox bbox; 1532 TT_Face face = (TT_Face)loader->face; 1533 FT_Fixed y_scale; 1534 TT_GlyphSlot glyph = loader->glyph; 1535 TT_Size size = (TT_Size)loader->size; 1536 1537 1538 y_scale = 0x10000L; 1539 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1540 y_scale = size->root.metrics.y_scale; 1541 1542 if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE ) 1543 FT_Outline_Get_CBox( &glyph->outline, &bbox ); 1544 else 1545 bbox = loader->bbox; 1546 1547 /* get the device-independent horizontal advance; it is scaled later */ 1548 /* by the base layer. */ 1549 { 1550 FT_Pos advance = loader->linear; 1551 1552 1553 /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */ 1554 /* correctly support DynaLab fonts, which have an incorrect */ 1555 /* `advance_Width_Max' field! It is used, to my knowledge, */ 1556 /* exclusively in the X-TrueType font server. */ 1557 /* */ 1558 if ( face->postscript.isFixedPitch && 1559 ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 ) 1560 advance = face->horizontal.advance_Width_Max; 1561 1562 /* we need to return the advance in font units in linearHoriAdvance, */ 1563 /* it will be scaled later by the base layer. */ 1564 glyph->linearHoriAdvance = advance; 1565 } 1566 1567 glyph->metrics.horiBearingX = bbox.xMin; 1568 glyph->metrics.horiBearingY = bbox.yMax; 1569 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; 1570 1571 /* Now take care of vertical metrics. In the case where there is */ 1572 /* no vertical information within the font (relatively common), make */ 1573 /* up some metrics by `hand'... */ 1574 1575 { 1576 FT_Pos top; /* scaled vertical top side bearing */ 1577 FT_Pos advance; /* scaled vertical advance height */ 1578 1579 1580 /* Get the unscaled top bearing and advance height. */ 1581 if ( face->vertical_info && 1582 face->vertical.number_Of_VMetrics > 0 ) 1583 { 1584 top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax, 1585 y_scale ); 1586 1587 if ( loader->pp3.y <= loader->pp4.y ) 1588 advance = 0; 1589 else 1590 advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y, 1591 y_scale ); 1592 } 1593 else 1594 { 1595 FT_Pos height; 1596 1597 1598 /* XXX Compute top side bearing and advance height in */ 1599 /* Get_VMetrics instead of here. */ 1600 1601 /* NOTE: The OS/2 values are the only `portable' ones, */ 1602 /* which is why we use them, if there is an OS/2 */ 1603 /* table in the font. Otherwise, we use the */ 1604 /* values defined in the horizontal header. */ 1605 1606 height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin, 1607 y_scale ); 1608 if ( face->os2.version != 0xFFFFU ) 1609 advance = (FT_Pos)( face->os2.sTypoAscender - 1610 face->os2.sTypoDescender ); 1611 else 1612 advance = (FT_Pos)( face->horizontal.Ascender - 1613 face->horizontal.Descender ); 1614 1615 top = ( advance - height ) / 2; 1616 } 1617 1618#ifdef FT_CONFIG_OPTION_INCREMENTAL 1619 { 1620 FT_Incremental_InterfaceRec* incr; 1621 FT_Incremental_MetricsRec metrics; 1622 FT_Error error; 1623 1624 1625 incr = face->root.internal->incremental_interface; 1626 1627 /* If this is an incrementally loaded font see if there are */ 1628 /* overriding metrics for this glyph. */ 1629 if ( incr && incr->funcs->get_glyph_metrics ) 1630 { 1631 metrics.bearing_x = 0; 1632 metrics.bearing_y = top; 1633 metrics.advance = advance; 1634 1635 error = incr->funcs->get_glyph_metrics( incr->object, 1636 glyph_index, 1637 TRUE, 1638 &metrics ); 1639 if ( error ) 1640 return error; 1641 1642 top = metrics.bearing_y; 1643 advance = metrics.advance; 1644 } 1645 } 1646 1647 /* GWW: Do vertical metrics get loaded incrementally too? */ 1648 1649#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1650 1651 glyph->linearVertAdvance = advance; 1652 1653 /* scale the metrics */ 1654 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1655 { 1656 top = FT_MulFix( top, y_scale ); 1657 advance = FT_MulFix( advance, y_scale ); 1658 } 1659 1660 /* XXX: for now, we have no better algorithm for the lsb, but it */ 1661 /* should work fine. */ 1662 /* */ 1663 glyph->metrics.vertBearingX = ( bbox.xMin - bbox.xMax ) / 2; 1664 glyph->metrics.vertBearingY = top; 1665 glyph->metrics.vertAdvance = advance; 1666 } 1667 1668 /* adjust advance width to the value contained in the hdmx table */ 1669 if ( !face->postscript.isFixedPitch && 1670 IS_HINTED( loader->load_flags ) ) 1671 { 1672 FT_Byte* widthp; 1673 1674 1675 widthp = tt_face_get_device_metrics( face, 1676 size->root.metrics.x_ppem, 1677 glyph_index ); 1678 1679 if ( widthp ) 1680 glyph->metrics.horiAdvance = *widthp << 6; 1681 } 1682 1683 /* set glyph dimensions */ 1684 glyph->metrics.width = bbox.xMax - bbox.xMin; 1685 glyph->metrics.height = bbox.yMax - bbox.yMin; 1686 1687 return 0; 1688 } 1689 1690 1691#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1692 1693 static FT_Error 1694 load_sbit_image( TT_Size size, 1695 TT_GlyphSlot glyph, 1696 FT_UInt glyph_index, 1697 FT_Int32 load_flags ) 1698 { 1699 TT_Face face; 1700 SFNT_Service sfnt; 1701 FT_Stream stream; 1702 FT_Error error; 1703 TT_SBit_MetricsRec metrics; 1704 1705 1706 face = (TT_Face)glyph->face; 1707 sfnt = (SFNT_Service)face->sfnt; 1708 stream = face->root.stream; 1709 1710 error = sfnt->load_sbit_image( face, 1711 size->strike_index, 1712 glyph_index, 1713 (FT_Int)load_flags, 1714 stream, 1715 &glyph->bitmap, 1716 &metrics ); 1717 if ( !error ) 1718 { 1719 glyph->outline.n_points = 0; 1720 glyph->outline.n_contours = 0; 1721 1722 glyph->metrics.width = (FT_Pos)metrics.width << 6; 1723 glyph->metrics.height = (FT_Pos)metrics.height << 6; 1724 1725 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 1726 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 1727 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 1728 1729 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 1730 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 1731 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 1732 1733 glyph->format = FT_GLYPH_FORMAT_BITMAP; 1734 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 1735 { 1736 glyph->bitmap_left = metrics.vertBearingX; 1737 glyph->bitmap_top = metrics.vertBearingY; 1738 } 1739 else 1740 { 1741 glyph->bitmap_left = metrics.horiBearingX; 1742 glyph->bitmap_top = metrics.horiBearingY; 1743 } 1744 } 1745 1746 return error; 1747 } 1748 1749#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 1750 1751 1752 static FT_Error 1753 tt_loader_init( TT_Loader loader, 1754 TT_Size size, 1755 TT_GlyphSlot glyph, 1756 FT_Int32 load_flags ) 1757 { 1758 TT_Face face; 1759 FT_Stream stream; 1760 1761 1762 face = (TT_Face)glyph->face; 1763 stream = face->root.stream; 1764 1765 FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) ); 1766 1767#ifdef TT_USE_BYTECODE_INTERPRETER 1768 1769 /* load execution context */ 1770 if ( IS_HINTED( load_flags ) ) 1771 { 1772 TT_ExecContext exec; 1773 FT_Bool grayscale; 1774 1775 1776 if ( !size->cvt_ready ) 1777 { 1778 FT_Error error = tt_size_ready_bytecode( size ); 1779 if ( error ) 1780 return error; 1781 } 1782 1783 /* query new execution context */ 1784 exec = size->debug ? size->context 1785 : ( (TT_Driver)FT_FACE_DRIVER( face ) )->context; 1786 if ( !exec ) 1787 return TT_Err_Could_Not_Find_Context; 1788 1789 grayscale = 1790 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO ); 1791 1792 TT_Load_Context( exec, face, size ); 1793 1794 /* a change from mono to grayscale rendering (and vice versa) */ 1795 /* requires a re-execution of the CVT program */ 1796 if ( grayscale != exec->grayscale ) 1797 { 1798 FT_UInt i; 1799 1800 1801 exec->grayscale = grayscale; 1802 1803 for ( i = 0; i < size->cvt_size; i++ ) 1804 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); 1805 tt_size_run_prep( size ); 1806 } 1807 1808 /* see whether the cvt program has disabled hinting */ 1809 if ( exec->GS.instruct_control & 1 ) 1810 load_flags |= FT_LOAD_NO_HINTING; 1811 1812 /* load default graphics state -- if needed */ 1813 if ( exec->GS.instruct_control & 2 ) 1814 exec->GS = tt_default_graphics_state; 1815 1816 exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); 1817 loader->exec = exec; 1818 loader->instructions = exec->glyphIns; 1819 } 1820 1821#endif /* TT_USE_BYTECODE_INTERPRETER */ 1822 1823 /* seek to the beginning of the glyph table -- for Type 42 fonts */ 1824 /* the table might be accessed from a Postscript stream or something */ 1825 /* else... */ 1826 1827#ifdef FT_CONFIG_OPTION_INCREMENTAL 1828 1829 if ( face->root.internal->incremental_interface ) 1830 loader->glyf_offset = 0; 1831 else 1832 1833#endif 1834 1835 { 1836 FT_Error error = face->goto_table( face, TTAG_glyf, stream, 0 ); 1837 1838 1839 if ( error ) 1840 { 1841 FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" )); 1842 return error; 1843 } 1844 loader->glyf_offset = FT_STREAM_POS(); 1845 } 1846 1847 /* get face's glyph loader */ 1848 { 1849 FT_GlyphLoader gloader = glyph->internal->loader; 1850 1851 1852 FT_GlyphLoader_Rewind( gloader ); 1853 loader->gloader = gloader; 1854 } 1855 1856 loader->load_flags = load_flags; 1857 1858 loader->face = (FT_Face)face; 1859 loader->size = (FT_Size)size; 1860 loader->glyph = (FT_GlyphSlot)glyph; 1861 loader->stream = stream; 1862 1863 return TT_Err_Ok; 1864 } 1865 1866 1867 /*************************************************************************/ 1868 /* */ 1869 /* <Function> */ 1870 /* TT_Load_Glyph */ 1871 /* */ 1872 /* <Description> */ 1873 /* A function used to load a single glyph within a given glyph slot, */ 1874 /* for a given size. */ 1875 /* */ 1876 /* <Input> */ 1877 /* glyph :: A handle to a target slot object where the glyph */ 1878 /* will be loaded. */ 1879 /* */ 1880 /* size :: A handle to the source face size at which the glyph */ 1881 /* must be scaled/loaded. */ 1882 /* */ 1883 /* glyph_index :: The index of the glyph in the font file. */ 1884 /* */ 1885 /* load_flags :: A flag indicating what to load for this glyph. The */ 1886 /* FT_LOAD_XXX constants can be used to control the */ 1887 /* glyph loading process (e.g., whether the outline */ 1888 /* should be scaled, whether to load bitmaps or not, */ 1889 /* whether to hint the outline, etc). */ 1890 /* */ 1891 /* <Return> */ 1892 /* FreeType error code. 0 means success. */ 1893 /* */ 1894 FT_LOCAL_DEF( FT_Error ) 1895 TT_Load_Glyph( TT_Size size, 1896 TT_GlyphSlot glyph, 1897 FT_UInt glyph_index, 1898 FT_Int32 load_flags ) 1899 { 1900 TT_Face face; 1901 FT_Error error; 1902 TT_LoaderRec loader; 1903 1904 1905 face = (TT_Face)glyph->face; 1906 error = TT_Err_Ok; 1907 1908#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1909 1910 /* try to load embedded bitmap if any */ 1911 /* */ 1912 /* XXX: The convention should be emphasized in */ 1913 /* the documents because it can be confusing. */ 1914 if ( size->strike_index != 0xFFFFFFFFUL && 1915 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 1916 { 1917 error = load_sbit_image( size, glyph, glyph_index, load_flags ); 1918 if ( !error ) 1919 return TT_Err_Ok; 1920 } 1921 1922#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 1923 1924 /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */ 1925 if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid ) 1926 return TT_Err_Invalid_Size_Handle; 1927 1928 if ( load_flags & FT_LOAD_SBITS_ONLY ) 1929 return TT_Err_Invalid_Argument; 1930 1931 error = tt_loader_init( &loader, size, glyph, load_flags ); 1932 if ( error ) 1933 return error; 1934 1935 glyph->format = FT_GLYPH_FORMAT_OUTLINE; 1936 glyph->num_subglyphs = 0; 1937 glyph->outline.flags = 0; 1938 1939 /* main loading loop */ 1940 error = load_truetype_glyph( &loader, glyph_index, 0 ); 1941 if ( !error ) 1942 { 1943 if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE ) 1944 { 1945 glyph->num_subglyphs = loader.gloader->base.num_subglyphs; 1946 glyph->subglyphs = loader.gloader->base.subglyphs; 1947 } 1948 else 1949 { 1950 glyph->outline = loader.gloader->base.outline; 1951 glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS; 1952 1953 /* In case bit 1 of the `flags' field in the `head' table isn't */ 1954 /* set, translate array so that (0,0) is the glyph's origin. */ 1955 if ( ( face->header.Flags & 2 ) == 0 && loader.pp1.x ) 1956 FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 ); 1957 } 1958 1959 compute_glyph_metrics( &loader, glyph_index ); 1960 } 1961 1962 /* Set the `high precision' bit flag. */ 1963 /* This is _critical_ to get correct output for monochrome */ 1964 /* TrueType glyphs at all sizes using the bytecode interpreter. */ 1965 /* */ 1966 if ( !( load_flags & FT_LOAD_NO_SCALE ) && 1967 size->root.metrics.y_ppem < 24 ) 1968 glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; 1969 1970 return error; 1971 } 1972 1973 1974/* END */ 1975