ttgload.c revision 1474f439b54ef1553d0aac57ebde6261f1b2ed81
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 FT_LOCAL_DEF(void) 73 TT_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 FT_LOCAL_DEF(void) 100 TT_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 /* the cast is for stupid compilers */ 409 *flag = (FT_Byte)( f & ~( 2 | 16 ) ); 410 } 411 412 /* reading the Y coordinates */ 413 414 vec = gloader->current.outline.points; 415 vec_limit = vec + n_points; 416 flag = (FT_Byte*)outline->tags; 417 x = 0; 418 419 for ( ; vec < vec_limit; vec++, flag++ ) 420 { 421 FT_Pos y = 0; 422 FT_Byte f = *flag; 423 424 425 if ( f & 4 ) 426 { 427 if ( p + 1 > limit ) 428 goto Invalid_Outline; 429 430 y = (FT_Pos)FT_NEXT_BYTE( p ); 431 if ( ( f & 32 ) == 0 ) 432 y = -y; 433 } 434 else if ( ( f & 32 ) == 0 ) 435 { 436 if ( p + 2 > limit ) 437 goto Invalid_Outline; 438 439 y = (FT_Pos)FT_NEXT_SHORT( p ); 440 } 441 442 x += y; 443 vec->y = x; 444 /* the cast is for stupid compilers */ 445 *flag = (FT_Byte)( f & FT_CURVE_TAG_ON ); 446 } 447 448 outline->n_points = (FT_UShort)n_points; 449 outline->n_contours = (FT_Short) n_contours; 450 451 load->cursor = p; 452 453 Fail: 454 return error; 455 456 Invalid_Outline: 457 error = TT_Err_Invalid_Outline; 458 goto Fail; 459 } 460 461 462 FT_CALLBACK_DEF( FT_Error ) 463 TT_Load_Composite_Glyph( TT_Loader loader ) 464 { 465 FT_Error error; 466 FT_Byte* p = loader->cursor; 467 FT_Byte* limit = loader->limit; 468 FT_GlyphLoader gloader = loader->gloader; 469 FT_SubGlyph subglyph; 470 FT_UInt num_subglyphs; 471 472 473 num_subglyphs = 0; 474 475 do 476 { 477 FT_Fixed xx, xy, yy, yx; 478 FT_UInt count; 479 480 481 /* check that we can load a new subglyph */ 482 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 ); 483 if ( error ) 484 goto Fail; 485 486 /* check space */ 487 if ( p + 4 > limit ) 488 goto Invalid_Composite; 489 490 subglyph = gloader->current.subglyphs + num_subglyphs; 491 492 subglyph->arg1 = subglyph->arg2 = 0; 493 494 subglyph->flags = FT_NEXT_USHORT( p ); 495 subglyph->index = FT_NEXT_USHORT( p ); 496 497 /* check space */ 498 count = 2; 499 if ( subglyph->flags & ARGS_ARE_WORDS ) 500 count += 2; 501 if ( subglyph->flags & WE_HAVE_A_SCALE ) 502 count += 2; 503 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 504 count += 4; 505 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 506 count += 8; 507 508 if ( p + count > limit ) 509 goto Invalid_Composite; 510 511 /* read arguments */ 512 if ( subglyph->flags & ARGS_ARE_WORDS ) 513 { 514 subglyph->arg1 = FT_NEXT_SHORT( p ); 515 subglyph->arg2 = FT_NEXT_SHORT( p ); 516 } 517 else 518 { 519 subglyph->arg1 = FT_NEXT_CHAR( p ); 520 subglyph->arg2 = FT_NEXT_CHAR( p ); 521 } 522 523 /* read transform */ 524 xx = yy = 0x10000L; 525 xy = yx = 0; 526 527 if ( subglyph->flags & WE_HAVE_A_SCALE ) 528 { 529 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 530 yy = xx; 531 } 532 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 533 { 534 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 535 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 536 } 537 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 538 { 539 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 540 yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 541 xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 542 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2; 543 } 544 545 subglyph->transform.xx = xx; 546 subglyph->transform.xy = xy; 547 subglyph->transform.yx = yx; 548 subglyph->transform.yy = yy; 549 550 num_subglyphs++; 551 552 } while ( subglyph->flags & MORE_COMPONENTS ); 553 554 gloader->current.num_subglyphs = num_subglyphs; 555 556#ifdef TT_USE_BYTECODE_INTERPRETER 557 558 { 559 FT_Stream stream = loader->stream; 560 561 562 /* we must undo the FT_FRAME_ENTER in order to point */ 563 /* to the composite instructions, if we find some. */ 564 /* We will process them later. */ 565 /* */ 566 loader->ins_pos = (FT_ULong)( FT_STREAM_POS() + 567 p - limit ); 568 } 569 570#endif 571 572 loader->cursor = p; 573 574 Fail: 575 return error; 576 577 Invalid_Composite: 578 error = TT_Err_Invalid_Composite; 579 goto Fail; 580 } 581 582 583 FT_LOCAL_DEF( void ) 584 TT_Init_Glyph_Loading( TT_Face face ) 585 { 586 face->access_glyph_frame = TT_Access_Glyph_Frame; 587 face->read_glyph_header = TT_Load_Glyph_Header; 588 face->read_simple_glyph = TT_Load_Simple_Glyph; 589 face->read_composite_glyph = TT_Load_Composite_Glyph; 590 face->forget_glyph_frame = TT_Forget_Glyph_Frame; 591 } 592 593 594 static void 595 tt_prepare_zone( TT_GlyphZone zone, 596 FT_GlyphLoad load, 597 FT_UInt start_point, 598 FT_UInt start_contour ) 599 { 600 zone->n_points = (FT_UShort)( load->outline.n_points - start_point ); 601 zone->n_contours = (FT_Short) ( load->outline.n_contours - 602 start_contour ); 603 zone->org = load->extra_points + start_point; 604 zone->cur = load->outline.points + start_point; 605 zone->orus = load->extra_points2 + start_point; 606 zone->tags = (FT_Byte*)load->outline.tags + start_point; 607 zone->contours = (FT_UShort*)load->outline.contours + start_contour; 608 zone->first_point = (FT_UShort)start_point; 609 } 610 611 612 /*************************************************************************/ 613 /* */ 614 /* <Function> */ 615 /* TT_Hint_Glyph */ 616 /* */ 617 /* <Description> */ 618 /* Hint the glyph using the zone prepared by the caller. Note that */ 619 /* the zone is supposed to include four phantom points. */ 620 /* */ 621 static FT_Error 622 TT_Hint_Glyph( TT_Loader loader, 623 FT_Bool is_composite ) 624 { 625 TT_GlyphZone zone = &loader->zone; 626 FT_Pos origin; 627 628#ifdef TT_USE_BYTECODE_INTERPRETER 629 FT_UInt n_ins; 630#else 631 FT_UNUSED( is_composite ); 632#endif 633 634 635#ifdef TT_USE_BYTECODE_INTERPRETER 636 n_ins = loader->glyph->control_len; 637#endif 638 639 origin = zone->cur[zone->n_points - 4].x; 640 origin = FT_PIX_ROUND( origin ) - origin; 641 if ( origin ) 642 translate_array( zone->n_points, zone->cur, origin, 0 ); 643 644#ifdef TT_USE_BYTECODE_INTERPRETER 645 /* save original point position in org */ 646 if ( n_ins > 0 ) 647 FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points ); 648 649 /* Reset graphics state. */ 650 loader->exec->GS = ((TT_Size)loader->size)->GS; 651 652 /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */ 653 /* completely refer to the (already) hinted subglyphs. */ 654 if ( is_composite ) 655 { 656 loader->exec->metrics.x_scale = 1 << 16; 657 loader->exec->metrics.y_scale = 1 << 16; 658 659 FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points ); 660 } 661 else 662 { 663 loader->exec->metrics.x_scale = 664 ((TT_Size)loader->size)->metrics.x_scale; 665 loader->exec->metrics.y_scale = 666 ((TT_Size)loader->size)->metrics.y_scale; 667 } 668#endif 669 670 /* round pp2 and pp4 */ 671 zone->cur[zone->n_points - 3].x = 672 FT_PIX_ROUND( zone->cur[zone->n_points - 3].x ); 673 zone->cur[zone->n_points - 1].y = 674 FT_PIX_ROUND( zone->cur[zone->n_points - 1].y ); 675 676#ifdef TT_USE_BYTECODE_INTERPRETER 677 678 if ( n_ins > 0 ) 679 { 680 FT_Bool debug; 681 FT_Error error; 682 683 684 error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph, 685 loader->exec->glyphIns, n_ins ); 686 if ( error ) 687 return error; 688 689 loader->exec->is_composite = is_composite; 690 loader->exec->pts = *zone; 691 692 debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) && 693 ((TT_Size)loader->size)->debug ); 694 695 error = TT_Run_Context( loader->exec, debug ); 696 if ( error && loader->exec->pedantic_hinting ) 697 return error; 698 } 699 700#endif 701 702 /* save glyph phantom points */ 703 if ( !loader->preserve_pps ) 704 { 705 loader->pp1 = zone->cur[zone->n_points - 4]; 706 loader->pp2 = zone->cur[zone->n_points - 3]; 707 loader->pp3 = zone->cur[zone->n_points - 2]; 708 loader->pp4 = zone->cur[zone->n_points - 1]; 709 } 710 711 return TT_Err_Ok; 712 } 713 714 715 /*************************************************************************/ 716 /* */ 717 /* <Function> */ 718 /* TT_Process_Simple_Glyph */ 719 /* */ 720 /* <Description> */ 721 /* Once a simple glyph has been loaded, it needs to be processed. */ 722 /* Usually, this means scaling and hinting through bytecode */ 723 /* interpretation. */ 724 /* */ 725 static FT_Error 726 TT_Process_Simple_Glyph( TT_Loader loader ) 727 { 728 FT_GlyphLoader gloader = loader->gloader; 729 FT_Error error = TT_Err_Ok; 730 FT_Outline* outline; 731 FT_Int n_points; 732 733 734 outline = &gloader->current.outline; 735 n_points = outline->n_points; 736 737 /* set phantom points */ 738 739 outline->points[n_points ] = loader->pp1; 740 outline->points[n_points + 1] = loader->pp2; 741 outline->points[n_points + 2] = loader->pp3; 742 outline->points[n_points + 3] = loader->pp4; 743 744 outline->tags[n_points ] = 0; 745 outline->tags[n_points + 1] = 0; 746 outline->tags[n_points + 2] = 0; 747 outline->tags[n_points + 3] = 0; 748 749 n_points += 4; 750 751#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 752 753 if ( ((TT_Face)loader->face)->doblend ) 754 { 755 /* Deltas apply to the unscaled data. */ 756 FT_Vector* deltas; 757 FT_Memory memory = loader->face->memory; 758 FT_Int i; 759 760 761 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), 762 loader->glyph_index, 763 &deltas, 764 n_points ); 765 if ( error ) 766 return error; 767 768 for ( i = 0; i < n_points; ++i ) 769 { 770 outline->points[i].x += deltas[i].x; 771 outline->points[i].y += deltas[i].y; 772 } 773 774 FT_FREE( deltas ); 775 } 776 777#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 778 779 if ( IS_HINTED( loader->load_flags ) ) 780 { 781 tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 ); 782 783 FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur, 784 loader->zone.n_points + 4 ); 785 } 786 787 /* scale the glyph */ 788 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 789 { 790 FT_Vector* vec = outline->points; 791 FT_Vector* limit = outline->points + n_points; 792 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; 793 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; 794 795 796 for ( ; vec < limit; vec++ ) 797 { 798 vec->x = FT_MulFix( vec->x, x_scale ); 799 vec->y = FT_MulFix( vec->y, y_scale ); 800 } 801 802 loader->pp1 = outline->points[n_points - 4]; 803 loader->pp2 = outline->points[n_points - 3]; 804 loader->pp3 = outline->points[n_points - 2]; 805 loader->pp4 = outline->points[n_points - 1]; 806 } 807 808 if ( IS_HINTED( loader->load_flags ) ) 809 { 810 loader->zone.n_points += 4; 811 812 error = TT_Hint_Glyph( loader, 0 ); 813 } 814 815 return error; 816 } 817 818 819 /*************************************************************************/ 820 /* */ 821 /* <Function> */ 822 /* TT_Process_Composite_Component */ 823 /* */ 824 /* <Description> */ 825 /* Once a composite component has been loaded, it needs to be */ 826 /* processed. Usually, this means transforming and translating. */ 827 /* */ 828 static FT_Error 829 TT_Process_Composite_Component( TT_Loader loader, 830 FT_SubGlyph subglyph, 831 FT_UInt start_point, 832 FT_UInt num_base_points ) 833 { 834 FT_GlyphLoader gloader = loader->gloader; 835 FT_Vector* base_vec = gloader->base.outline.points; 836 FT_UInt num_points = gloader->base.outline.n_points; 837 FT_Bool have_scale; 838 FT_Pos x, y; 839 840 841 have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE | 842 WE_HAVE_AN_XY_SCALE | 843 WE_HAVE_A_2X2 ) ); 844 845 /* perform the transform required for this subglyph */ 846 if ( have_scale ) 847 { 848 FT_UInt i; 849 850 851 for ( i = num_base_points; i < num_points; i++ ) 852 FT_Vector_Transform( base_vec + i, &subglyph->transform ); 853 } 854 855 /* get offset */ 856 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) 857 { 858 FT_UInt k = subglyph->arg1; 859 FT_UInt l = subglyph->arg2; 860 FT_Vector* p1; 861 FT_Vector* p2; 862 863 864 /* match l-th point of the newly loaded component to the k-th point */ 865 /* of the previously loaded components. */ 866 867 /* change to the point numbers used by our outline */ 868 k += start_point; 869 l += num_base_points; 870 if ( k >= num_base_points || 871 l >= num_points ) 872 return TT_Err_Invalid_Composite; 873 874 p1 = gloader->base.outline.points + k; 875 p2 = gloader->base.outline.points + l; 876 877 x = p1->x - p2->x; 878 y = p1->y - p2->y; 879 } 880 else 881 { 882 x = subglyph->arg1; 883 y = subglyph->arg2; 884 885 if ( !x && !y ) 886 return TT_Err_Ok; 887 888 /* Use a default value dependent on */ 889 /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */ 890 /* fonts which don't set the xxx_COMPONENT_OFFSET bit. */ 891 892 if ( have_scale && 893#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED 894 !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) ) 895#else 896 ( subglyph->flags & SCALED_COMPONENT_OFFSET ) ) 897#endif 898 { 899 900#if 0 901 902 /*************************************************************************/ 903 /* */ 904 /* This algorithm is what Apple documents. But it doesn't work. */ 905 /* */ 906 int a = subglyph->transform.xx > 0 ? subglyph->transform.xx 907 : -subglyph->transform.xx; 908 int b = subglyph->transform.yx > 0 ? subglyph->transform.yx 909 : -subglyph->transform.yx; 910 int c = subglyph->transform.xy > 0 ? subglyph->transform.xy 911 : -subglyph->transform.xy; 912 int d = subglyph->transform.yy > 0 ? subglyph->transform.yy 913 : -subglyph->transform.yy; 914 int m = a > b ? a : b; 915 int n = c > d ? c : d; 916 917 918 if ( a - b <= 33 && a - b >= -33 ) 919 m *= 2; 920 if ( c - d <= 33 && c - d >= -33 ) 921 n *= 2; 922 x = FT_MulFix( x, m ); 923 y = FT_MulFix( y, n ); 924 925#else /* 0 */ 926 927 /*************************************************************************/ 928 /* */ 929 /* This algorithm is a guess and works much better than the above. */ 930 /* */ 931 FT_Fixed mac_xscale = FT_SqrtFixed( 932 FT_MulFix( subglyph->transform.xx, 933 subglyph->transform.xx ) + 934 FT_MulFix( subglyph->transform.xy, 935 subglyph->transform.xy ) ); 936 FT_Fixed mac_yscale = FT_SqrtFixed( 937 FT_MulFix( subglyph->transform.yy, 938 subglyph->transform.yy ) + 939 FT_MulFix( subglyph->transform.yx, 940 subglyph->transform.yx ) ); 941 942 943 x = FT_MulFix( x, mac_xscale ); 944 y = FT_MulFix( y, mac_yscale ); 945 946#endif /* 0 */ 947 948 } 949 950 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 951 { 952 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale; 953 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale; 954 955 956 x = FT_MulFix( x, x_scale ); 957 y = FT_MulFix( y, y_scale ); 958 959 if ( subglyph->flags & ROUND_XY_TO_GRID ) 960 { 961 x = FT_PIX_ROUND( x ); 962 y = FT_PIX_ROUND( y ); 963 } 964 } 965 } 966 967 if ( x || y ) 968 translate_array( num_points - num_base_points, 969 base_vec + num_base_points, 970 x, y ); 971 972 return TT_Err_Ok; 973 } 974 975 976 /*************************************************************************/ 977 /* */ 978 /* <Function> */ 979 /* TT_Process_Composite_Glyph */ 980 /* */ 981 /* <Description> */ 982 /* This is slightly different from TT_Process_Simple_Glyph, in that */ 983 /* its sole purpose is to hint the glyph. Thus this function is */ 984 /* only available when bytecode interpreter is enabled. */ 985 /* */ 986 static FT_Error 987 TT_Process_Composite_Glyph( TT_Loader loader, 988 FT_UInt start_point, 989 FT_UInt start_contour ) 990 { 991 FT_Error error; 992 FT_Outline* outline; 993 FT_UInt i; 994 995 996 outline = &loader->gloader->base.outline; 997 998 /* make room for phantom points */ 999 error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader, 1000 outline->n_points + 4, 1001 0 ); 1002 if ( error ) 1003 return error; 1004 1005 outline->points[outline->n_points ] = loader->pp1; 1006 outline->points[outline->n_points + 1] = loader->pp2; 1007 outline->points[outline->n_points + 2] = loader->pp3; 1008 outline->points[outline->n_points + 3] = loader->pp4; 1009 1010 outline->tags[outline->n_points ] = 0; 1011 outline->tags[outline->n_points + 1] = 0; 1012 outline->tags[outline->n_points + 2] = 0; 1013 outline->tags[outline->n_points + 3] = 0; 1014 1015#ifdef TT_USE_BYTECODE_INTERPRETER 1016 1017 { 1018 FT_Stream stream = loader->stream; 1019 FT_UShort n_ins; 1020 1021 1022 /* TT_Load_Composite_Glyph only gives us the offset of instructions */ 1023 /* so we read them here */ 1024 if ( FT_STREAM_SEEK( loader->ins_pos ) || 1025 FT_READ_USHORT( n_ins ) ) 1026 return error; 1027 1028 FT_TRACE5(( " Instructions size = %d\n", n_ins )); 1029 1030 /* check it */ 1031 if ( n_ins > ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions ) 1032 { 1033 FT_TRACE0(( "TT_Process_Composite_Glyph: Too many instructions (%d)\n", 1034 n_ins )); 1035 1036 return TT_Err_Too_Many_Hints; 1037 } 1038 else if ( n_ins == 0 ) 1039 return TT_Err_Ok; 1040 1041 if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) ) 1042 return error; 1043 1044 loader->glyph->control_data = loader->exec->glyphIns; 1045 loader->glyph->control_len = n_ins; 1046 } 1047 1048#endif 1049 1050 tt_prepare_zone( &loader->zone, &loader->gloader->base, 1051 start_point, start_contour ); 1052 1053 /* Some points are likely touched during execution of */ 1054 /* instructions on components. So let's untouch them. */ 1055 for ( i = start_point; i < loader->zone.n_points; i++ ) 1056 loader->zone.tags[i] &= ~( FT_CURVE_TAG_TOUCH_X | 1057 FT_CURVE_TAG_TOUCH_Y ); 1058 1059 loader->zone.n_points += 4; 1060 1061 return TT_Hint_Glyph( loader, 1 ); 1062 } 1063 1064 1065 /* Calculate the four phantom points. */ 1066 /* The first two stand for horizontal origin and advance. */ 1067 /* The last two stand for vertical origin and advance. */ 1068#define TT_LOADER_SET_PP( loader ) \ 1069 do { \ 1070 (loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \ 1071 (loader)->pp1.y = 0; \ 1072 (loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \ 1073 (loader)->pp2.y = 0; \ 1074 (loader)->pp3.x = 0; \ 1075 (loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax; \ 1076 (loader)->pp4.x = 0; \ 1077 (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \ 1078 } while ( 0 ) 1079 1080 1081 /*************************************************************************/ 1082 /* */ 1083 /* <Function> */ 1084 /* load_truetype_glyph */ 1085 /* */ 1086 /* <Description> */ 1087 /* Loads a given truetype glyph. Handles composites and uses a */ 1088 /* TT_Loader object. */ 1089 /* */ 1090 static FT_Error 1091 load_truetype_glyph( TT_Loader loader, 1092 FT_UInt glyph_index, 1093 FT_UInt recurse_count ) 1094 { 1095 FT_Error error; 1096 FT_Fixed x_scale, y_scale; 1097 FT_ULong offset; 1098 TT_Face face = (TT_Face)loader->face; 1099 FT_GlyphLoader gloader = loader->gloader; 1100 FT_Bool opened_frame = 0; 1101 1102#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1103 FT_Vector* deltas = NULL; 1104#endif 1105 1106#ifdef FT_CONFIG_OPTION_INCREMENTAL 1107 FT_StreamRec inc_stream; 1108 FT_Data glyph_data; 1109 FT_Bool glyph_data_loaded = 0; 1110#endif 1111 1112 1113 /* some fonts have an incorrect value of `maxComponentDepth', */ 1114 /* thus we allow depth 1 to catch the majority of them */ 1115 if ( recurse_count > 1 && 1116 recurse_count > face->max_profile.maxComponentDepth ) 1117 { 1118 error = TT_Err_Invalid_Composite; 1119 goto Exit; 1120 } 1121 1122 /* check glyph index */ 1123 if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) 1124 { 1125 error = TT_Err_Invalid_Glyph_Index; 1126 goto Exit; 1127 } 1128 1129 loader->glyph_index = glyph_index; 1130 1131 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1132 { 1133 x_scale = ((TT_Size)loader->size)->metrics.x_scale; 1134 y_scale = ((TT_Size)loader->size)->metrics.y_scale; 1135 } 1136 else 1137 { 1138 x_scale = 0x10000L; 1139 y_scale = 0x10000L; 1140 } 1141 1142 /* get metrics, horizontal and vertical */ 1143 { 1144 FT_Short left_bearing = 0, top_bearing = 0; 1145 FT_UShort advance_width = 0, advance_height = 0; 1146 1147 1148 TT_Get_HMetrics( face, glyph_index, 1149 (FT_Bool)!( loader->load_flags & 1150 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), 1151 &left_bearing, 1152 &advance_width ); 1153 TT_Get_VMetrics( face, glyph_index, 1154 (FT_Bool)!( loader->load_flags & 1155 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), 1156 &top_bearing, 1157 &advance_height ); 1158 1159#ifdef FT_CONFIG_OPTION_INCREMENTAL 1160 1161 /* If this is an incrementally loaded font see if there are */ 1162 /* overriding metrics for this glyph. */ 1163 if ( face->root.internal->incremental_interface && 1164 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 1165 { 1166 FT_Incremental_MetricsRec metrics; 1167 1168 1169 metrics.bearing_x = left_bearing; 1170 metrics.bearing_y = 0; 1171 metrics.advance = advance_width; 1172 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 1173 face->root.internal->incremental_interface->object, 1174 glyph_index, FALSE, &metrics ); 1175 if ( error ) 1176 goto Exit; 1177 left_bearing = (FT_Short)metrics.bearing_x; 1178 advance_width = (FT_UShort)metrics.advance; 1179 1180#if 0 1181 1182 /* GWW: Do I do the same for vertical metrics? */ 1183 metrics.bearing_x = 0; 1184 metrics.bearing_y = top_bearing; 1185 metrics.advance = advance_height; 1186 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 1187 face->root.internal->incremental_interface->object, 1188 glyph_index, TRUE, &metrics ); 1189 if ( error ) 1190 goto Exit; 1191 top_bearing = (FT_Short)metrics.bearing_y; 1192 advance_height = (FT_UShort)metrics.advance; 1193 1194#endif /* 0 */ 1195 1196 } 1197 1198#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1199 1200 loader->left_bearing = left_bearing; 1201 loader->advance = advance_width; 1202 loader->top_bearing = top_bearing; 1203 loader->vadvance = advance_height; 1204 1205 if ( !loader->linear_def ) 1206 { 1207 loader->linear_def = 1; 1208 loader->linear = advance_width; 1209 } 1210 } 1211 1212 /* Set `offset' to the start of the glyph relative to the start of */ 1213 /* the `glyf' table, and `byte_len' to the length of the glyph in */ 1214 /* bytes. */ 1215 1216#ifdef FT_CONFIG_OPTION_INCREMENTAL 1217 1218 /* If we are loading glyph data via the incremental interface, set */ 1219 /* the loader stream to a memory stream reading the data returned */ 1220 /* by the interface. */ 1221 if ( face->root.internal->incremental_interface ) 1222 { 1223 error = face->root.internal->incremental_interface->funcs->get_glyph_data( 1224 face->root.internal->incremental_interface->object, 1225 glyph_index, &glyph_data ); 1226 if ( error ) 1227 goto Exit; 1228 1229 glyph_data_loaded = 1; 1230 offset = 0; 1231 loader->byte_len = glyph_data.length; 1232 1233 FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) ); 1234 FT_Stream_OpenMemory( &inc_stream, 1235 glyph_data.pointer, glyph_data.length ); 1236 1237 loader->stream = &inc_stream; 1238 } 1239 else 1240 1241#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1242 1243 offset = tt_face_get_location( face, glyph_index, 1244 (FT_UInt*)&loader->byte_len ); 1245 1246 if ( loader->byte_len > 0 ) 1247 { 1248 if ( !loader->glyf_offset ) 1249 { 1250 FT_TRACE2(( "no `glyf' table but non-zero `loca' entry!\n" )); 1251 error = TT_Err_Invalid_Table; 1252 goto Exit; 1253 } 1254 1255 error = face->access_glyph_frame( loader, glyph_index, 1256 loader->glyf_offset + offset, 1257 loader->byte_len ); 1258 if ( error ) 1259 goto Exit; 1260 1261 opened_frame = 1; 1262 1263 /* read first glyph header */ 1264 error = face->read_glyph_header( loader ); 1265 if ( error ) 1266 goto Exit; 1267 } 1268 1269 if ( loader->byte_len == 0 || loader->n_contours == 0 ) 1270 { 1271 loader->bbox.xMin = 0; 1272 loader->bbox.xMax = 0; 1273 loader->bbox.yMin = 0; 1274 loader->bbox.yMax = 0; 1275 1276 TT_LOADER_SET_PP( loader ); 1277 1278#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1279 1280 if ( ((TT_Face)(loader->face))->doblend ) 1281 { 1282 /* this must be done before scaling */ 1283 FT_Memory memory = loader->face->memory; 1284 1285 1286 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face), 1287 glyph_index, &deltas, 4 ); 1288 if ( error ) 1289 goto Exit; 1290 1291 loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y; 1292 loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y; 1293 loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y; 1294 loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y; 1295 1296 FT_FREE( deltas ); 1297 } 1298 1299#endif 1300 1301 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1302 { 1303 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1304 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1305 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1306 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1307 } 1308 1309 error = TT_Err_Ok; 1310 goto Exit; 1311 } 1312 1313 TT_LOADER_SET_PP( loader ); 1314 1315 /***********************************************************************/ 1316 /***********************************************************************/ 1317 /***********************************************************************/ 1318 1319 /* if it is a simple glyph, load it */ 1320 1321 if ( loader->n_contours > 0 ) 1322 { 1323 error = face->read_simple_glyph( loader ); 1324 if ( error ) 1325 goto Exit; 1326 1327 /* all data have been read */ 1328 face->forget_glyph_frame( loader ); 1329 opened_frame = 0; 1330 1331 error = TT_Process_Simple_Glyph( loader ); 1332 if ( error ) 1333 goto Exit; 1334 1335 FT_GlyphLoader_Add( gloader ); 1336 } 1337 1338 /***********************************************************************/ 1339 /***********************************************************************/ 1340 /***********************************************************************/ 1341 1342 /* otherwise, load a composite! */ 1343 else if ( loader->n_contours == -1 ) 1344 { 1345 FT_UInt start_point; 1346 FT_UInt start_contour; 1347 FT_ULong ins_pos; /* position of composite instructions, if any */ 1348 1349 1350 start_point = gloader->base.outline.n_points; 1351 start_contour = gloader->base.outline.n_contours; 1352 1353 /* for each subglyph, read composite header */ 1354 error = face->read_composite_glyph( loader ); 1355 if ( error ) 1356 goto Exit; 1357 1358 /* store the offset of instructions */ 1359 ins_pos = loader->ins_pos; 1360 1361 /* all data we need are read */ 1362 face->forget_glyph_frame( loader ); 1363 opened_frame = 0; 1364 1365#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1366 1367 if ( face->doblend ) 1368 { 1369 FT_Int i, limit; 1370 FT_SubGlyph subglyph; 1371 FT_Memory memory = face->root.memory; 1372 1373 1374 /* this provides additional offsets */ 1375 /* for each component's translation */ 1376 1377 if ( ( error = TT_Vary_Get_Glyph_Deltas( 1378 face, 1379 glyph_index, 1380 &deltas, 1381 gloader->current.num_subglyphs + 4 )) != 0 ) 1382 goto Exit; 1383 1384 subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs; 1385 limit = gloader->current.num_subglyphs; 1386 1387 for ( i = 0; i < limit; ++i, ++subglyph ) 1388 { 1389 if ( subglyph->flags & ARGS_ARE_XY_VALUES ) 1390 { 1391 subglyph->arg1 += deltas[i].x; 1392 subglyph->arg2 += deltas[i].y; 1393 } 1394 } 1395 1396 loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y; 1397 loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y; 1398 loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y; 1399 loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y; 1400 1401 FT_FREE( deltas ); 1402 } 1403 1404#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 1405 1406 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1407 { 1408 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1409 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1410 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1411 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1412 } 1413 1414 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ 1415 /* `as is' in the glyph slot (the client application will be */ 1416 /* responsible for interpreting these data)... */ 1417 if ( loader->load_flags & FT_LOAD_NO_RECURSE ) 1418 { 1419 FT_GlyphLoader_Add( gloader ); 1420 loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE; 1421 1422 goto Exit; 1423 } 1424 1425 /*********************************************************************/ 1426 /*********************************************************************/ 1427 /*********************************************************************/ 1428 1429 { 1430 FT_UInt n, num_base_points; 1431 FT_SubGlyph subglyph = 0; 1432 1433 FT_UInt num_points = start_point; 1434 FT_UInt num_subglyphs = gloader->current.num_subglyphs; 1435 FT_UInt num_base_subgs = gloader->base.num_subglyphs; 1436 1437 FT_Stream old_stream = loader->stream; 1438 1439 1440 FT_GlyphLoader_Add( gloader ); 1441 1442 /* read each subglyph independently */ 1443 for ( n = 0; n < num_subglyphs; n++ ) 1444 { 1445 FT_Vector pp[4]; 1446 1447 1448 /* Each time we call load_truetype_glyph in this loop, the */ 1449 /* value of `gloader.base.subglyphs' can change due to table */ 1450 /* reallocations. We thus need to recompute the subglyph */ 1451 /* pointer on each iteration. */ 1452 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1453 1454 pp[0] = loader->pp1; 1455 pp[1] = loader->pp2; 1456 pp[2] = loader->pp3; 1457 pp[3] = loader->pp4; 1458 1459 num_base_points = gloader->base.outline.n_points; 1460 1461 error = load_truetype_glyph( loader, subglyph->index, 1462 recurse_count + 1 ); 1463 if ( error ) 1464 goto Exit; 1465 1466 /* restore subglyph pointer */ 1467 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1468 1469 if ( !( subglyph->flags & USE_MY_METRICS ) ) 1470 { 1471 loader->pp1 = pp[0]; 1472 loader->pp2 = pp[1]; 1473 loader->pp3 = pp[2]; 1474 loader->pp4 = pp[3]; 1475 } 1476 1477 num_points = gloader->base.outline.n_points; 1478 1479 if ( num_points == num_base_points ) 1480 continue; 1481 1482 /* gloader->base.outline consists of three parts: */ 1483 /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */ 1484 /* */ 1485 /* (1): exists from the beginning */ 1486 /* (2): components that have been loaded so far */ 1487 /* (3): the newly loaded component */ 1488 TT_Process_Composite_Component( loader, subglyph, start_point, 1489 num_base_points ); 1490 } 1491 1492 loader->stream = old_stream; 1493 1494 /* process the glyph */ 1495 loader->ins_pos = ins_pos; 1496 if ( IS_HINTED( loader->load_flags ) && 1497 1498#ifdef TT_USE_BYTECODE_INTERPRETER 1499 1500 subglyph->flags & WE_HAVE_INSTR && 1501 1502#endif 1503 1504 num_points > start_point ) 1505 TT_Process_Composite_Glyph( loader, start_point, start_contour ); 1506 1507 } 1508 } 1509 else 1510 { 1511 /* invalid composite count (negative but not -1) */ 1512 error = TT_Err_Invalid_Outline; 1513 goto Exit; 1514 } 1515 1516 /***********************************************************************/ 1517 /***********************************************************************/ 1518 /***********************************************************************/ 1519 1520 Exit: 1521 1522 if ( opened_frame ) 1523 face->forget_glyph_frame( loader ); 1524 1525#ifdef FT_CONFIG_OPTION_INCREMENTAL 1526 1527 if ( glyph_data_loaded ) 1528 face->root.internal->incremental_interface->funcs->free_glyph_data( 1529 face->root.internal->incremental_interface->object, 1530 &glyph_data ); 1531 1532#endif 1533 1534 return error; 1535 } 1536 1537 1538 static FT_Error 1539 compute_glyph_metrics( TT_Loader loader, 1540 FT_UInt glyph_index ) 1541 { 1542 FT_BBox bbox; 1543 TT_Face face = (TT_Face)loader->face; 1544 FT_Fixed y_scale; 1545 TT_GlyphSlot glyph = loader->glyph; 1546 TT_Size size = (TT_Size)loader->size; 1547 1548 1549 y_scale = 0x10000L; 1550 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1551 y_scale = size->root.metrics.y_scale; 1552 1553 if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE ) 1554 FT_Outline_Get_CBox( &glyph->outline, &bbox ); 1555 else 1556 bbox = loader->bbox; 1557 1558 /* get the device-independent horizontal advance; it is scaled later */ 1559 /* by the base layer. */ 1560 { 1561 FT_Pos advance = loader->linear; 1562 1563 1564 /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */ 1565 /* correctly support DynaLab fonts, which have an incorrect */ 1566 /* `advance_Width_Max' field! It is used, to my knowledge, */ 1567 /* exclusively in the X-TrueType font server. */ 1568 /* */ 1569 if ( face->postscript.isFixedPitch && 1570 ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 ) 1571 advance = face->horizontal.advance_Width_Max; 1572 1573 /* we need to return the advance in font units in linearHoriAdvance, */ 1574 /* it will be scaled later by the base layer. */ 1575 glyph->linearHoriAdvance = advance; 1576 } 1577 1578 glyph->metrics.horiBearingX = bbox.xMin; 1579 glyph->metrics.horiBearingY = bbox.yMax; 1580 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; 1581 1582 /* Now take care of vertical metrics. In the case where there is */ 1583 /* no vertical information within the font (relatively common), make */ 1584 /* up some metrics by `hand'... */ 1585 1586 { 1587 FT_Pos top; /* scaled vertical top side bearing */ 1588 FT_Pos advance; /* scaled vertical advance height */ 1589 1590 1591 /* Get the unscaled top bearing and advance height. */ 1592 if ( face->vertical_info && 1593 face->vertical.number_Of_VMetrics > 0 ) 1594 { 1595 top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax, 1596 y_scale ); 1597 1598 if ( loader->pp3.y <= loader->pp4.y ) 1599 advance = 0; 1600 else 1601 advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y, 1602 y_scale ); 1603 } 1604 else 1605 { 1606 FT_Pos height; 1607 1608 1609 /* XXX Compute top side bearing and advance height in */ 1610 /* Get_VMetrics instead of here. */ 1611 1612 /* NOTE: The OS/2 values are the only `portable' ones, */ 1613 /* which is why we use them, if there is an OS/2 */ 1614 /* table in the font. Otherwise, we use the */ 1615 /* values defined in the horizontal header. */ 1616 1617 height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin, 1618 y_scale ); 1619 if ( face->os2.version != 0xFFFFU ) 1620 advance = (FT_Pos)( face->os2.sTypoAscender - 1621 face->os2.sTypoDescender ); 1622 else 1623 advance = (FT_Pos)( face->horizontal.Ascender - 1624 face->horizontal.Descender ); 1625 1626 top = ( advance - height ) / 2; 1627 } 1628 1629#ifdef FT_CONFIG_OPTION_INCREMENTAL 1630 { 1631 FT_Incremental_InterfaceRec* incr; 1632 FT_Incremental_MetricsRec metrics; 1633 FT_Error error; 1634 1635 1636 incr = face->root.internal->incremental_interface; 1637 1638 /* If this is an incrementally loaded font see if there are */ 1639 /* overriding metrics for this glyph. */ 1640 if ( incr && incr->funcs->get_glyph_metrics ) 1641 { 1642 metrics.bearing_x = 0; 1643 metrics.bearing_y = top; 1644 metrics.advance = advance; 1645 1646 error = incr->funcs->get_glyph_metrics( incr->object, 1647 glyph_index, 1648 TRUE, 1649 &metrics ); 1650 if ( error ) 1651 return error; 1652 1653 top = metrics.bearing_y; 1654 advance = metrics.advance; 1655 } 1656 } 1657 1658 /* GWW: Do vertical metrics get loaded incrementally too? */ 1659 1660#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1661 1662 glyph->linearVertAdvance = advance; 1663 1664 /* scale the metrics */ 1665 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1666 { 1667 top = FT_MulFix( top, y_scale ); 1668 advance = FT_MulFix( advance, y_scale ); 1669 } 1670 1671 /* XXX: for now, we have no better algorithm for the lsb, but it */ 1672 /* should work fine. */ 1673 /* */ 1674 glyph->metrics.vertBearingX = ( bbox.xMin - bbox.xMax ) / 2; 1675 glyph->metrics.vertBearingY = top; 1676 glyph->metrics.vertAdvance = advance; 1677 } 1678 1679 /* adjust advance width to the value contained in the hdmx table */ 1680 if ( !face->postscript.isFixedPitch && 1681 IS_HINTED( loader->load_flags ) ) 1682 { 1683 FT_Byte* widthp; 1684 1685 1686 widthp = tt_face_get_device_metrics( face, 1687 size->root.metrics.x_ppem, 1688 glyph_index ); 1689 1690 if ( widthp ) 1691 glyph->metrics.horiAdvance = *widthp << 6; 1692 } 1693 1694 /* set glyph dimensions */ 1695 glyph->metrics.width = bbox.xMax - bbox.xMin; 1696 glyph->metrics.height = bbox.yMax - bbox.yMin; 1697 1698 return 0; 1699 } 1700 1701 1702#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1703 1704 static FT_Error 1705 load_sbit_image( TT_Size size, 1706 TT_GlyphSlot glyph, 1707 FT_UInt glyph_index, 1708 FT_Int32 load_flags ) 1709 { 1710 TT_Face face; 1711 SFNT_Service sfnt; 1712 FT_Stream stream; 1713 FT_Error error; 1714 TT_SBit_MetricsRec metrics; 1715 1716 1717 face = (TT_Face)glyph->face; 1718 sfnt = (SFNT_Service)face->sfnt; 1719 stream = face->root.stream; 1720 1721 error = sfnt->load_sbit_image( face, 1722 size->strike_index, 1723 glyph_index, 1724 (FT_Int)load_flags, 1725 stream, 1726 &glyph->bitmap, 1727 &metrics ); 1728 if ( !error ) 1729 { 1730 glyph->outline.n_points = 0; 1731 glyph->outline.n_contours = 0; 1732 1733 glyph->metrics.width = (FT_Pos)metrics.width << 6; 1734 glyph->metrics.height = (FT_Pos)metrics.height << 6; 1735 1736 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 1737 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 1738 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 1739 1740 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 1741 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 1742 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 1743 1744 glyph->format = FT_GLYPH_FORMAT_BITMAP; 1745 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 1746 { 1747 glyph->bitmap_left = metrics.vertBearingX; 1748 glyph->bitmap_top = metrics.vertBearingY; 1749 } 1750 else 1751 { 1752 glyph->bitmap_left = metrics.horiBearingX; 1753 glyph->bitmap_top = metrics.horiBearingY; 1754 } 1755 } 1756 1757 return error; 1758 } 1759 1760#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 1761 1762 1763 static FT_Error 1764 tt_loader_init( TT_Loader loader, 1765 TT_Size size, 1766 TT_GlyphSlot glyph, 1767 FT_Int32 load_flags ) 1768 { 1769 TT_Face face; 1770 FT_Stream stream; 1771 1772 1773 face = (TT_Face)glyph->face; 1774 stream = face->root.stream; 1775 1776 FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) ); 1777 1778#ifdef TT_USE_BYTECODE_INTERPRETER 1779 1780 /* load execution context */ 1781 if ( IS_HINTED( load_flags ) ) 1782 { 1783 TT_ExecContext exec; 1784 FT_Bool grayscale; 1785 1786 1787 if ( !size->cvt_ready ) 1788 { 1789 FT_Error error = tt_size_ready_bytecode( size ); 1790 if ( error ) 1791 return error; 1792 } 1793 1794 /* query new execution context */ 1795 exec = size->debug ? size->context 1796 : ( (TT_Driver)FT_FACE_DRIVER( face ) )->context; 1797 if ( !exec ) 1798 return TT_Err_Could_Not_Find_Context; 1799 1800 grayscale = 1801 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO ); 1802 1803 TT_Load_Context( exec, face, size ); 1804 1805 /* a change from mono to grayscale rendering (and vice versa) */ 1806 /* requires a re-execution of the CVT program */ 1807 if ( grayscale != exec->grayscale ) 1808 { 1809 FT_UInt i; 1810 1811 1812 exec->grayscale = grayscale; 1813 1814 for ( i = 0; i < size->cvt_size; i++ ) 1815 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); 1816 tt_size_run_prep( size ); 1817 } 1818 1819 /* see whether the cvt program has disabled hinting */ 1820 if ( exec->GS.instruct_control & 1 ) 1821 load_flags |= FT_LOAD_NO_HINTING; 1822 1823 /* load default graphics state -- if needed */ 1824 if ( exec->GS.instruct_control & 2 ) 1825 exec->GS = tt_default_graphics_state; 1826 1827 exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); 1828 loader->exec = exec; 1829 loader->instructions = exec->glyphIns; 1830 } 1831 1832#endif /* TT_USE_BYTECODE_INTERPRETER */ 1833 1834 /* seek to the beginning of the glyph table -- for Type 42 fonts */ 1835 /* the table might be accessed from a Postscript stream or something */ 1836 /* else... */ 1837 1838#ifdef FT_CONFIG_OPTION_INCREMENTAL 1839 1840 if ( face->root.internal->incremental_interface ) 1841 loader->glyf_offset = 0; 1842 else 1843 1844#endif 1845 1846 { 1847 FT_Error error = face->goto_table( face, TTAG_glyf, stream, 0 ); 1848 1849 1850 if ( error == TT_Err_Table_Missing ) 1851 loader->glyf_offset = 0; 1852 else if ( error ) 1853 { 1854 FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" )); 1855 return error; 1856 } 1857 else 1858 loader->glyf_offset = FT_STREAM_POS(); 1859 } 1860 1861 /* get face's glyph loader */ 1862 { 1863 FT_GlyphLoader gloader = glyph->internal->loader; 1864 1865 1866 FT_GlyphLoader_Rewind( gloader ); 1867 loader->gloader = gloader; 1868 } 1869 1870 loader->load_flags = load_flags; 1871 1872 loader->face = (FT_Face)face; 1873 loader->size = (FT_Size)size; 1874 loader->glyph = (FT_GlyphSlot)glyph; 1875 loader->stream = stream; 1876 1877 return TT_Err_Ok; 1878 } 1879 1880 1881 /*************************************************************************/ 1882 /* */ 1883 /* <Function> */ 1884 /* TT_Load_Glyph */ 1885 /* */ 1886 /* <Description> */ 1887 /* A function used to load a single glyph within a given glyph slot, */ 1888 /* for a given size. */ 1889 /* */ 1890 /* <Input> */ 1891 /* glyph :: A handle to a target slot object where the glyph */ 1892 /* will be loaded. */ 1893 /* */ 1894 /* size :: A handle to the source face size at which the glyph */ 1895 /* must be scaled/loaded. */ 1896 /* */ 1897 /* glyph_index :: The index of the glyph in the font file. */ 1898 /* */ 1899 /* load_flags :: A flag indicating what to load for this glyph. The */ 1900 /* FT_LOAD_XXX constants can be used to control the */ 1901 /* glyph loading process (e.g., whether the outline */ 1902 /* should be scaled, whether to load bitmaps or not, */ 1903 /* whether to hint the outline, etc). */ 1904 /* */ 1905 /* <Return> */ 1906 /* FreeType error code. 0 means success. */ 1907 /* */ 1908 FT_LOCAL_DEF( FT_Error ) 1909 TT_Load_Glyph( TT_Size size, 1910 TT_GlyphSlot glyph, 1911 FT_UInt glyph_index, 1912 FT_Int32 load_flags ) 1913 { 1914 TT_Face face; 1915 FT_Error error; 1916 TT_LoaderRec loader; 1917 1918 1919 face = (TT_Face)glyph->face; 1920 error = TT_Err_Ok; 1921 1922#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1923 1924 /* try to load embedded bitmap if any */ 1925 /* */ 1926 /* XXX: The convention should be emphasized in */ 1927 /* the documents because it can be confusing. */ 1928 if ( size->strike_index != 0xFFFFFFFFUL && 1929 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 1930 { 1931 error = load_sbit_image( size, glyph, glyph_index, load_flags ); 1932 if ( !error ) 1933 return TT_Err_Ok; 1934 } 1935 1936#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 1937 1938 /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */ 1939 if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid ) 1940 return TT_Err_Invalid_Size_Handle; 1941 1942 if ( load_flags & FT_LOAD_SBITS_ONLY ) 1943 return TT_Err_Invalid_Argument; 1944 1945 error = tt_loader_init( &loader, size, glyph, load_flags ); 1946 if ( error ) 1947 return error; 1948 1949 glyph->format = FT_GLYPH_FORMAT_OUTLINE; 1950 glyph->num_subglyphs = 0; 1951 glyph->outline.flags = 0; 1952 1953 /* main loading loop */ 1954 error = load_truetype_glyph( &loader, glyph_index, 0 ); 1955 if ( !error ) 1956 { 1957 if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE ) 1958 { 1959 glyph->num_subglyphs = loader.gloader->base.num_subglyphs; 1960 glyph->subglyphs = loader.gloader->base.subglyphs; 1961 } 1962 else 1963 { 1964 glyph->outline = loader.gloader->base.outline; 1965 glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS; 1966 1967 /* In case bit 1 of the `flags' field in the `head' table isn't */ 1968 /* set, translate array so that (0,0) is the glyph's origin. */ 1969 if ( ( face->header.Flags & 2 ) == 0 && loader.pp1.x ) 1970 FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 ); 1971 } 1972 1973#ifdef TT_USE_BYTECODE_INTERPRETER 1974 1975 if ( IS_HINTED( load_flags ) ) 1976 { 1977 if ( loader.exec->GS.scan_control ) 1978 { 1979 /* convert scan conversion mode to FT_OUTLINE_XXX flags */ 1980 switch ( loader.exec->GS.scan_type ) 1981 { 1982 case 0: /* simple drop-outs including stubs */ 1983 glyph->outline.flags |= FT_OUTLINE_INCLUDE_STUBS; 1984 break; 1985 case 1: /* simple drop-outs excluding stubs */ 1986 /* nothing; it's the default rendering mode */ 1987 break; 1988 case 4: /* smart drop-outs including stubs */ 1989 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS | 1990 FT_OUTLINE_INCLUDE_STUBS; 1991 break; 1992 case 5: /* smart drop-outs excluding stubs */ 1993 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS; 1994 break; 1995 1996 default: /* no drop-out control */ 1997 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; 1998 break; 1999 } 2000 } 2001 else 2002 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; 2003 } 2004 2005#endif /* TT_USE_BYTECODE_INTERPRETER */ 2006 2007 compute_glyph_metrics( &loader, glyph_index ); 2008 } 2009 2010 /* Set the `high precision' bit flag. */ 2011 /* This is _critical_ to get correct output for monochrome */ 2012 /* TrueType glyphs at all sizes using the bytecode interpreter. */ 2013 /* */ 2014 if ( !( load_flags & FT_LOAD_NO_SCALE ) && 2015 size->root.metrics.y_ppem < 24 ) 2016 glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; 2017 2018 return error; 2019 } 2020 2021 2022/* END */ 2023