ttgload.c revision c28b8c1bfbddb176b8fd6d2c1a55814476c34501
1/***************************************************************************/ 2/* */ 3/* ttgload.c */ 4/* */ 5/* TrueType Glyph Loader (body). */ 6/* */ 7/* Copyright 1996-2001, 2002, 2003, 2004 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 29#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 30#include "ttgxvar.h" 31#endif 32 33#include "tterrors.h" 34 35 36 /*************************************************************************/ 37 /* */ 38 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 39 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 40 /* messages during execution. */ 41 /* */ 42#undef FT_COMPONENT 43#define FT_COMPONENT trace_ttgload 44 45 46 /*************************************************************************/ 47 /* */ 48 /* Composite font flags. */ 49 /* */ 50#define ARGS_ARE_WORDS 0x0001 51#define ARGS_ARE_XY_VALUES 0x0002 52#define ROUND_XY_TO_GRID 0x0004 53#define WE_HAVE_A_SCALE 0x0008 54/* reserved 0x0010 */ 55#define MORE_COMPONENTS 0x0020 56#define WE_HAVE_AN_XY_SCALE 0x0040 57#define WE_HAVE_A_2X2 0x0080 58#define WE_HAVE_INSTR 0x0100 59#define USE_MY_METRICS 0x0200 60#define OVERLAP_COMPOUND 0x0400 61#define SCALED_COMPONENT_OFFSET 0x0800 62#define UNSCALED_COMPONENT_OFFSET 0x1000 63 64 65/* Maximum recursion depth we allow for composite glyphs. 66 * The TrueType spec doesn't say anything about recursion, 67 * so it isn't clear that recursion is allowed at all. But 68 * we'll be generous. 69 */ 70#define TT_MAX_COMPOSITE_RECURSE 5 71 72 73 74 /*************************************************************************/ 75 /* */ 76 /* <Function> */ 77 /* TT_Get_Metrics */ 78 /* */ 79 /* <Description> */ 80 /* Returns the horizontal or vertical metrics in font units for a */ 81 /* given glyph. The metrics are the left side bearing (resp. top */ 82 /* side bearing) and advance width (resp. advance height). */ 83 /* */ 84 /* <Input> */ 85 /* header :: A pointer to either the horizontal or vertical metrics */ 86 /* structure. */ 87 /* */ 88 /* idx :: The glyph index. */ 89 /* */ 90 /* <Output> */ 91 /* bearing :: The bearing, either left side or top side. */ 92 /* */ 93 /* advance :: The advance width resp. advance height. */ 94 /* */ 95 /* <Note> */ 96 /* This function will much probably move to another component in the */ 97 /* near future, but I haven't decided which yet. */ 98 /* */ 99 FT_LOCAL_DEF( void ) 100 TT_Get_Metrics( TT_HoriHeader* header, 101 FT_UInt idx, 102 FT_Short* bearing, 103 FT_UShort* advance ) 104 { 105 TT_LongMetrics longs_m; 106 FT_UShort k = header->number_Of_HMetrics; 107 108 109 if ( k == 0 ) 110 { 111 *bearing = *advance = 0; 112 return; 113 } 114 115 if ( idx < (FT_UInt)k ) 116 { 117 longs_m = (TT_LongMetrics )header->long_metrics + idx; 118 *bearing = longs_m->bearing; 119 *advance = longs_m->advance; 120 } 121 else 122 { 123 *bearing = ((TT_ShortMetrics*)header->short_metrics)[idx - k]; 124 *advance = ((TT_LongMetrics )header->long_metrics)[k - 1].advance; 125 } 126 } 127 128 129 /*************************************************************************/ 130 /* */ 131 /* Returns the horizontal metrics in font units for a given glyph. If */ 132 /* `check' is true, take care of monospaced fonts by returning the */ 133 /* advance width maximum. */ 134 /* */ 135 static void 136 Get_HMetrics( TT_Face face, 137 FT_UInt idx, 138 FT_Bool check, 139 FT_Short* lsb, 140 FT_UShort* aw ) 141 { 142 TT_Get_Metrics( &face->horizontal, idx, lsb, aw ); 143 144 if ( check && face->postscript.isFixedPitch ) 145 *aw = face->horizontal.advance_Width_Max; 146 } 147 148 149 /*************************************************************************/ 150 /* */ 151 /* Returns the advance width table for a given pixel size if it is found */ 152 /* in the font's `hdmx' table (if any). */ 153 /* */ 154 static FT_Byte* 155 Get_Advance_Widths( TT_Face face, 156 FT_UShort ppem ) 157 { 158 FT_UShort n; 159 160 161 for ( n = 0; n < face->hdmx.num_records; n++ ) 162 if ( face->hdmx.records[n].ppem == ppem ) 163 return face->hdmx.records[n].widths; 164 165 return NULL; 166 } 167 168 169 /*************************************************************************/ 170 /* */ 171 /* Returns the vertical metrics in font units for a given glyph. */ 172 /* Greg Hitchcock from Microsoft told us that if there were no `vmtx' */ 173 /* table, typoAscender/Descender from the `OS/2' table would be used */ 174 /* instead, and if there were no `OS/2' table, use ascender/descender */ 175 /* from the `hhea' table. But that is not what Microsoft's rasterizer */ 176 /* apparently does: It uses the ppem value as the advance height, and */ 177 /* sets the top side bearing to be zero. */ 178 /* */ 179 /* The monospace `check' is probably not meaningful here, but we leave */ 180 /* it in for a consistent interface. */ 181 /* */ 182 static void 183 Get_VMetrics( TT_Face face, 184 FT_UInt idx, 185 FT_Bool check, 186 FT_Short* tsb, 187 FT_UShort* ah ) 188 { 189 FT_UNUSED( check ); 190 191 if ( face->vertical_info ) 192 TT_Get_Metrics( (TT_HoriHeader *)&face->vertical, idx, tsb, ah ); 193 194#if 1 /* Emperically determined, at variance with what MS said */ 195 196 else 197 { 198 *tsb = 0; 199 *ah = face->root.units_per_EM; 200 } 201 202#else /* This is what MS said to do. It isn't what they do, however. */ 203 204 else if ( face->os2.version != 0xFFFFU ) 205 { 206 *tsb = face->os2.sTypoAscender; 207 *ah = face->os2.sTypoAscender - face->os2.sTypoDescender; 208 } 209 else 210 { 211 *tsb = face->horizontal.Ascender; 212 *ah = face->horizontal.Ascender - face->horizontal.Descender; 213 } 214 215#endif 216 217 } 218 219 220#define cur_to_org( n, zone ) \ 221 FT_ARRAY_COPY( (zone)->org, (zone)->cur, (n) ) 222 223#define org_to_cur( n, zone ) \ 224 FT_ARRAY_COPY( (zone)->cur, (zone)->org, (n) ) 225 226 227 /*************************************************************************/ 228 /* */ 229 /* Translates an array of coordinates. */ 230 /* */ 231 static void 232 translate_array( FT_UInt n, 233 FT_Vector* coords, 234 FT_Pos delta_x, 235 FT_Pos delta_y ) 236 { 237 FT_UInt k; 238 239 240 if ( delta_x ) 241 for ( k = 0; k < n; k++ ) 242 coords[k].x += delta_x; 243 244 if ( delta_y ) 245 for ( k = 0; k < n; k++ ) 246 coords[k].y += delta_y; 247 } 248 249 250 static void 251 tt_prepare_zone( TT_GlyphZone zone, 252 FT_GlyphLoad load, 253 FT_UInt start_point, 254 FT_UInt start_contour ) 255 { 256 zone->n_points = (FT_UShort)( load->outline.n_points - start_point ); 257 zone->n_contours = (FT_Short) ( load->outline.n_contours - start_contour ); 258 zone->org = load->extra_points + start_point; 259 zone->cur = load->outline.points + start_point; 260 zone->tags = (FT_Byte*)load->outline.tags + start_point; 261 zone->contours = (FT_UShort*)load->outline.contours + start_contour; 262 } 263 264 265#undef IS_HINTED 266#define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 ) 267 268 269 /*************************************************************************/ 270 /* */ 271 /* The following functions are used by default with TrueType fonts. */ 272 /* However, they can be replaced by alternatives if we need to support */ 273 /* TrueType-compressed formats (like MicroType) in the future. */ 274 /* */ 275 /*************************************************************************/ 276 277 FT_CALLBACK_DEF( FT_Error ) 278 TT_Access_Glyph_Frame( TT_Loader loader, 279 FT_UInt glyph_index, 280 FT_ULong offset, 281 FT_UInt byte_count ) 282 { 283 FT_Error error; 284 FT_Stream stream = loader->stream; 285 286 /* for non-debug mode */ 287 FT_UNUSED( glyph_index ); 288 289 290 FT_TRACE5(( "Glyph %ld\n", glyph_index )); 291 292 /* the following line sets the `error' variable through macros! */ 293 if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) ) 294 return error; 295 296 return TT_Err_Ok; 297 } 298 299 300 FT_CALLBACK_DEF( void ) 301 TT_Forget_Glyph_Frame( TT_Loader loader ) 302 { 303 FT_Stream stream = loader->stream; 304 305 306 FT_FRAME_EXIT(); 307 } 308 309 310 FT_CALLBACK_DEF( FT_Error ) 311 TT_Load_Glyph_Header( TT_Loader loader ) 312 { 313 FT_Stream stream = loader->stream; 314 FT_Int byte_len = loader->byte_len - 10; 315 316 317 if ( byte_len < 0 ) 318 return TT_Err_Invalid_Outline; 319 320 loader->n_contours = FT_GET_SHORT(); 321 322 loader->bbox.xMin = FT_GET_SHORT(); 323 loader->bbox.yMin = FT_GET_SHORT(); 324 loader->bbox.xMax = FT_GET_SHORT(); 325 loader->bbox.yMax = FT_GET_SHORT(); 326 327 FT_TRACE5(( " # of contours: %d\n", loader->n_contours )); 328 FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin, 329 loader->bbox.xMax )); 330 FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin, 331 loader->bbox.yMax )); 332 loader->byte_len = byte_len; 333 334 return TT_Err_Ok; 335 } 336 337 338 FT_CALLBACK_DEF( FT_Error ) 339 TT_Load_Simple_Glyph( TT_Loader load ) 340 { 341 FT_Error error; 342 FT_Stream stream = load->stream; 343 FT_GlyphLoader gloader = load->gloader; 344 FT_Int n_contours = load->n_contours; 345 FT_Outline* outline; 346 TT_Face face = (TT_Face)load->face; 347 TT_GlyphSlot slot = (TT_GlyphSlot)load->glyph; 348 FT_UShort n_ins; 349 FT_Int n, n_points; 350 FT_Int byte_len = load->byte_len; 351 352 FT_Byte *flag, *flag_limit; 353 FT_Byte c, count; 354 FT_Vector *vec, *vec_limit; 355 FT_Pos x; 356 FT_Short *cont, *cont_limit; 357 358 359 /* reading the contours' endpoints & number of points */ 360 cont = gloader->current.outline.contours; 361 cont_limit = cont + n_contours; 362 363 /* check space for contours array + instructions count */ 364 byte_len -= 2 * ( n_contours + 1 ); 365 if ( byte_len < 0 ) 366 goto Invalid_Outline; 367 368 for ( ; cont < cont_limit; cont++ ) 369 cont[0] = FT_GET_USHORT(); 370 371 n_points = 0; 372 if ( n_contours > 0 ) 373 n_points = cont[-1] + 1; 374 375 error = FT_GlyphLoader_CheckPoints( gloader, n_points + 4, 0 ); 376 if ( error ) 377 goto Fail; 378 379 /* we'd better check the contours table right now */ 380 outline = &gloader->current.outline; 381 382 for ( cont = outline->contours + 1; cont < cont_limit; cont++ ) 383 if ( cont[-1] >= cont[0] ) 384 goto Invalid_Outline; 385 386 /* reading the bytecode instructions */ 387 slot->control_len = 0; 388 slot->control_data = 0; 389 390 n_ins = FT_GET_USHORT(); 391 392 FT_TRACE5(( " Instructions size: %u\n", n_ins )); 393 394 if ( n_ins > face->max_profile.maxSizeOfInstructions ) 395 { 396 FT_TRACE0(( "TT_Load_Simple_Glyph: Too many instructions!\n" )); 397 error = TT_Err_Too_Many_Hints; 398 goto Fail; 399 } 400 401 byte_len -= (FT_Int)n_ins; 402 if ( byte_len < 0 ) 403 { 404 FT_TRACE0(( "TT_Load_Simple_Glyph: Instruction count mismatch!\n" )); 405 error = TT_Err_Too_Many_Hints; 406 goto Fail; 407 } 408 409#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 410 411 if ( ( load->load_flags & 412 ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) ) == 0 && 413 load->instructions ) 414 { 415 slot->control_len = n_ins; 416 slot->control_data = load->instructions; 417 418 FT_MEM_COPY( load->instructions, stream->cursor, (FT_Long)n_ins ); 419 } 420 421#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 422 423 stream->cursor += (FT_Int)n_ins; 424 425 /* reading the point tags */ 426 flag = (FT_Byte*)outline->tags; 427 flag_limit = flag + n_points; 428 429 while ( flag < flag_limit ) 430 { 431 if ( --byte_len < 0 ) 432 goto Invalid_Outline; 433 434 *flag++ = c = FT_GET_BYTE(); 435 if ( c & 8 ) 436 { 437 if ( --byte_len < 0 ) 438 goto Invalid_Outline; 439 440 count = FT_GET_BYTE(); 441 if ( flag + (FT_Int)count > flag_limit ) 442 goto Invalid_Outline; 443 444 for ( ; count > 0; count-- ) 445 *flag++ = c; 446 } 447 } 448 449 /* check that there is enough room to load the coordinates */ 450 for ( flag = (FT_Byte*)outline->tags; flag < flag_limit; flag++ ) 451 { 452 if ( *flag & 2 ) 453 byte_len -= 1; 454 else if ( ( *flag & 16 ) == 0 ) 455 byte_len -= 2; 456 457 if ( *flag & 4 ) 458 byte_len -= 1; 459 else if ( ( *flag & 32 ) == 0 ) 460 byte_len -= 2; 461 } 462 463 if ( byte_len < 0 ) 464 goto Invalid_Outline; 465 466 /* reading the X coordinates */ 467 468 vec = outline->points; 469 vec_limit = vec + n_points; 470 flag = (FT_Byte*)outline->tags; 471 x = 0; 472 473 for ( ; vec < vec_limit; vec++, flag++ ) 474 { 475 FT_Pos y = 0; 476 477 478 if ( *flag & 2 ) 479 { 480 y = (FT_Pos)FT_GET_BYTE(); 481 if ( ( *flag & 16 ) == 0 ) 482 y = -y; 483 } 484 else if ( ( *flag & 16 ) == 0 ) 485 y = (FT_Pos)FT_GET_SHORT(); 486 487 x += y; 488 vec->x = x; 489 } 490 491 /* reading the Y coordinates */ 492 493 vec = gloader->current.outline.points; 494 vec_limit = vec + n_points; 495 flag = (FT_Byte*)outline->tags; 496 x = 0; 497 498 for ( ; vec < vec_limit; vec++, flag++ ) 499 { 500 FT_Pos y = 0; 501 502 503 if ( *flag & 4 ) 504 { 505 y = (FT_Pos)FT_GET_BYTE(); 506 if ( ( *flag & 32 ) == 0 ) 507 y = -y; 508 } 509 else if ( ( *flag & 32 ) == 0 ) 510 y = (FT_Pos)FT_GET_SHORT(); 511 512 x += y; 513 vec->y = x; 514 } 515 516 /* clear the touch tags */ 517 for ( n = 0; n < n_points; n++ ) 518 outline->tags[n] &= FT_CURVE_TAG_ON; 519 520 outline->n_points = (FT_UShort)n_points; 521 outline->n_contours = (FT_Short) n_contours; 522 523 load->byte_len = byte_len; 524 525 Fail: 526 return error; 527 528 Invalid_Outline: 529 error = TT_Err_Invalid_Outline; 530 goto Fail; 531 } 532 533 534 FT_CALLBACK_DEF( FT_Error ) 535 TT_Load_Composite_Glyph( TT_Loader loader ) 536 { 537 FT_Error error; 538 FT_Stream stream = loader->stream; 539 FT_GlyphLoader gloader = loader->gloader; 540 FT_SubGlyph subglyph; 541 FT_UInt num_subglyphs; 542 FT_Int byte_len = loader->byte_len; 543 544 545 num_subglyphs = 0; 546 547 do 548 { 549 FT_Fixed xx, xy, yy, yx; 550 551 552 /* check that we can load a new subglyph */ 553 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 ); 554 if ( error ) 555 goto Fail; 556 557 /* check space */ 558 byte_len -= 4; 559 if ( byte_len < 0 ) 560 goto Invalid_Composite; 561 562 subglyph = gloader->current.subglyphs + num_subglyphs; 563 564 subglyph->arg1 = subglyph->arg2 = 0; 565 566 subglyph->flags = FT_GET_USHORT(); 567 subglyph->index = FT_GET_USHORT(); 568 569 /* check space */ 570 byte_len -= 2; 571 if ( subglyph->flags & ARGS_ARE_WORDS ) 572 byte_len -= 2; 573 if ( subglyph->flags & WE_HAVE_A_SCALE ) 574 byte_len -= 2; 575 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 576 byte_len -= 4; 577 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 578 byte_len -= 8; 579 580 if ( byte_len < 0 ) 581 goto Invalid_Composite; 582 583 /* read arguments */ 584 if ( subglyph->flags & ARGS_ARE_WORDS ) 585 { 586 subglyph->arg1 = FT_GET_SHORT(); 587 subglyph->arg2 = FT_GET_SHORT(); 588 } 589 else 590 { 591 subglyph->arg1 = FT_GET_CHAR(); 592 subglyph->arg2 = FT_GET_CHAR(); 593 } 594 595 /* read transform */ 596 xx = yy = 0x10000L; 597 xy = yx = 0; 598 599 if ( subglyph->flags & WE_HAVE_A_SCALE ) 600 { 601 xx = (FT_Fixed)FT_GET_SHORT() << 2; 602 yy = xx; 603 } 604 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) 605 { 606 xx = (FT_Fixed)FT_GET_SHORT() << 2; 607 yy = (FT_Fixed)FT_GET_SHORT() << 2; 608 } 609 else if ( subglyph->flags & WE_HAVE_A_2X2 ) 610 { 611 xx = (FT_Fixed)FT_GET_SHORT() << 2; 612 yx = (FT_Fixed)FT_GET_SHORT() << 2; 613 xy = (FT_Fixed)FT_GET_SHORT() << 2; 614 yy = (FT_Fixed)FT_GET_SHORT() << 2; 615 } 616 617 subglyph->transform.xx = xx; 618 subglyph->transform.xy = xy; 619 subglyph->transform.yx = yx; 620 subglyph->transform.yy = yy; 621 622 num_subglyphs++; 623 624 } while ( subglyph->flags & MORE_COMPONENTS ); 625 626 gloader->current.num_subglyphs = num_subglyphs; 627 628#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 629 { 630 /* we must undo the FT_FRAME_ENTER in order to point to the */ 631 /* composite instructions, if we find some. */ 632 /* we will process them later... */ 633 /* */ 634 loader->ins_pos = (FT_ULong)( FT_STREAM_POS() + 635 stream->cursor - stream->limit ); 636 } 637#endif 638 639 loader->byte_len = byte_len; 640 641 Fail: 642 return error; 643 644 Invalid_Composite: 645 error = TT_Err_Invalid_Composite; 646 goto Fail; 647 } 648 649 650 FT_LOCAL_DEF( void ) 651 TT_Init_Glyph_Loading( TT_Face face ) 652 { 653 face->access_glyph_frame = TT_Access_Glyph_Frame; 654 face->read_glyph_header = TT_Load_Glyph_Header; 655 face->read_simple_glyph = TT_Load_Simple_Glyph; 656 face->read_composite_glyph = TT_Load_Composite_Glyph; 657 face->forget_glyph_frame = TT_Forget_Glyph_Frame; 658 } 659 660 661 /*************************************************************************/ 662 /* */ 663 /* <Function> */ 664 /* TT_Process_Simple_Glyph */ 665 /* */ 666 /* <Description> */ 667 /* Once a simple glyph has been loaded, it needs to be processed. */ 668 /* Usually, this means scaling and hinting through bytecode */ 669 /* interpretation. */ 670 /* */ 671 static FT_Error 672 TT_Process_Simple_Glyph( TT_Loader load, 673 FT_Bool debug ) 674 { 675 FT_GlyphLoader gloader = load->gloader; 676 FT_Outline* outline = &gloader->current.outline; 677 FT_UInt n_points = outline->n_points; 678#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 679 FT_UInt n_ins; 680#endif 681 TT_GlyphZone zone = &load->zone; 682 FT_Error error = TT_Err_Ok; 683 684 FT_UNUSED( debug ); /* used by truetype interpreter only */ 685 686 687#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 688 n_ins = load->glyph->control_len; 689#endif 690 691 /* add shadow points */ 692 693 /* Add two horizontal shadow points at n and n+1. */ 694 /* We need the left side bearing and advance width. */ 695 /* Add two vertical shadow points at n+2 and n+3. */ 696 /* We need the top side bearing and advance height. */ 697 698 { 699 FT_Vector* pp1; 700 FT_Vector* pp2; 701 FT_Vector* pp3; 702 FT_Vector* pp4; 703 704 705 /* pp1 = xMin - lsb */ 706 pp1 = outline->points + n_points; 707 pp1->x = load->bbox.xMin - load->left_bearing; 708 pp1->y = 0; 709 710 /* pp2 = pp1 + aw */ 711 pp2 = pp1 + 1; 712 pp2->x = pp1->x + load->advance; 713 pp2->y = 0; 714 715 /* pp3 = top side bearing */ 716 pp3 = pp1 + 2; 717 pp3->x = 0; 718 pp3->y = load->top_bearing + load->bbox.yMax; 719 720 /* pp4 = pp3 - ah */ 721 pp4 = pp1 + 3; 722 pp4->x = 0; 723 pp4->y = pp3->y - load->vadvance; 724 725 outline->tags[n_points ] = 0; 726 outline->tags[n_points + 1] = 0; 727 outline->tags[n_points + 2] = 0; 728 outline->tags[n_points + 3] = 0; 729 } 730 731 /* Note that we return four more points that are not */ 732 /* part of the glyph outline. */ 733 734 n_points += 4; 735 736#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 737 738 if ( ((TT_Face)load->face)->doblend ) 739 { 740 /* Deltas apply to the unscaled data. */ 741 FT_Vector* deltas; 742 FT_Memory memory = load->face->memory; 743 FT_StreamRec saved_stream = *(load->stream); 744 FT_UInt i; 745 746 747 /* TT_Vary_Get_Glyph_Deltas uses a frame, thus we have to save */ 748 /* (and restore) the current one */ 749 load->stream->cursor = 0; 750 load->stream->limit = 0; 751 752 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(load->face), 753 load->glyph_index, 754 &deltas, 755 n_points ); 756 757 *(load->stream) = saved_stream; 758 759 if ( error ) 760 goto Exit; 761 762 for ( i = 0; i < n_points; ++i ) 763 { 764 outline->points[i].x += deltas[i].x; 765 outline->points[i].y += deltas[i].y; 766 } 767 768 FT_FREE( deltas ); 769 } 770 771#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 772 773 /* set up zone for hinting */ 774 tt_prepare_zone( zone, &gloader->current, 0, 0 ); 775 776 /* eventually scale the glyph */ 777 if ( !( load->load_flags & FT_LOAD_NO_SCALE ) ) 778 { 779 FT_Vector* vec = zone->cur; 780 FT_Vector* limit = vec + n_points; 781 FT_Fixed x_scale = ((TT_Size)load->size)->metrics.x_scale; 782 FT_Fixed y_scale = ((TT_Size)load->size)->metrics.y_scale; 783 784 /* first scale the glyph points */ 785 for ( ; vec < limit; vec++ ) 786 { 787 vec->x = FT_MulFix( vec->x, x_scale ); 788 vec->y = FT_MulFix( vec->y, y_scale ); 789 } 790 } 791 792 cur_to_org( n_points, zone ); 793 794 /* eventually hint the glyph */ 795 if ( IS_HINTED( load->load_flags ) ) 796 { 797 FT_Pos x = zone->org[n_points-4].x; 798 FT_Pos y = zone->org[n_points-2].y; 799 800 801 x = FT_PIX_ROUND( x ) - x; 802 y = FT_PIX_ROUND( y ) - y; 803 translate_array( n_points, zone->org, x, y ); 804 805 org_to_cur( n_points, zone ); 806 807 zone->cur[n_points - 3].x = FT_PIX_ROUND( zone->cur[n_points - 3].x ); 808 zone->cur[n_points - 1].y = FT_PIX_ROUND( zone->cur[n_points - 1].y ); 809 810#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 811 812 /* now consider hinting */ 813 if ( n_ins > 0 ) 814 { 815 error = TT_Set_CodeRange( load->exec, tt_coderange_glyph, 816 load->exec->glyphIns, n_ins ); 817 if ( error ) 818 goto Exit; 819 820 load->exec->is_composite = FALSE; 821 load->exec->pedantic_hinting = (FT_Bool)( load->load_flags & 822 FT_LOAD_PEDANTIC ); 823 load->exec->pts = *zone; 824 load->exec->pts.n_points += 4; 825 826 error = TT_Run_Context( load->exec, debug ); 827 if ( error && load->exec->pedantic_hinting ) 828 goto Exit; 829 830 error = TT_Err_Ok; /* ignore bytecode errors in non-pedantic mode */ 831 } 832 833#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 834 835 } 836 837 /* save glyph phantom points */ 838 if ( !load->preserve_pps ) 839 { 840 load->pp1 = zone->cur[n_points - 4]; 841 load->pp2 = zone->cur[n_points - 3]; 842 load->pp3 = zone->cur[n_points - 2]; 843 load->pp4 = zone->cur[n_points - 1]; 844 } 845 846#if defined( TT_CONFIG_OPTION_BYTECODE_INTERPRETER ) || \ 847 defined( TT_CONFIG_OPTION_GX_VAR_SUPPORT ) 848 Exit: 849#endif 850 851 return error; 852 } 853 854 855 /*************************************************************************/ 856 /* */ 857 /* <Function> */ 858 /* load_truetype_glyph */ 859 /* */ 860 /* <Description> */ 861 /* Loads a given truetype glyph. Handles composites and uses a */ 862 /* TT_Loader object. */ 863 /* */ 864 static FT_Error 865 load_truetype_glyph( TT_Loader loader, 866 FT_UInt glyph_index, 867 FT_UInt recurse_count ) 868 { 869 870#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 871 FT_Stream stream = loader->stream; 872#endif 873 874 FT_Error error; 875 TT_Face face = (TT_Face)loader->face; 876 FT_ULong offset; 877 FT_Int contours_count; 878 FT_UInt num_points, count; 879 FT_Fixed x_scale, y_scale; 880 FT_GlyphLoader gloader = loader->gloader; 881 FT_Bool opened_frame = 0; 882 883#ifdef FT_CONFIG_OPTION_INCREMENTAL 884 FT_StreamRec inc_stream; 885 FT_Data glyph_data; 886 FT_Bool glyph_data_loaded = 0; 887#endif 888 889#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 890 FT_Vector *deltas; 891#endif 892 893 894 if ( recurse_count >= TT_MAX_COMPOSITE_RECURSE ) 895 { 896 error = TT_Err_Invalid_Composite; 897 goto Exit; 898 } 899 900 /* check glyph index */ 901 if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) 902 { 903 error = TT_Err_Invalid_Glyph_Index; 904 goto Exit; 905 } 906 907 loader->glyph_index = glyph_index; 908 num_points = 0; 909 910 x_scale = 0x10000L; 911 y_scale = 0x10000L; 912 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 913 { 914 x_scale = ((TT_Size)loader->size)->metrics.x_scale; 915 y_scale = ((TT_Size)loader->size)->metrics.y_scale; 916 } 917 918 /* get metrics, horizontal and vertical */ 919 { 920 FT_Short left_bearing = 0, top_bearing = 0; 921 FT_UShort advance_width = 0, advance_height = 0; 922 923 924 Get_HMetrics( face, glyph_index, 925 (FT_Bool)!( loader->load_flags & 926 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), 927 &left_bearing, 928 &advance_width ); 929 Get_VMetrics( face, glyph_index, 930 (FT_Bool)!( loader->load_flags & 931 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ), 932 &top_bearing, 933 &advance_height ); 934 935#ifdef FT_CONFIG_OPTION_INCREMENTAL 936 937 /* If this is an incrementally loaded font see if there are */ 938 /* overriding metrics for this glyph. */ 939 if ( face->root.internal->incremental_interface && 940 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 941 { 942 FT_Incremental_MetricsRec metrics; 943 944 945 metrics.bearing_x = left_bearing; 946 metrics.bearing_y = 0; 947 metrics.advance = advance_width; 948 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 949 face->root.internal->incremental_interface->object, 950 glyph_index, FALSE, &metrics ); 951 if ( error ) 952 goto Exit; 953 left_bearing = (FT_Short)metrics.bearing_x; 954 advance_width = (FT_UShort)metrics.advance; 955 } 956 957# if 0 958 /* GWW: Do I do the same for vertical metrics ??? */ 959 if ( face->root.internal->incremental_interface && 960 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 961 { 962 FT_Incremental_MetricsRec metrics; 963 964 965 metrics.bearing_x = 0; 966 metrics.bearing_y = top_bearing; 967 metrics.advance = advance_height; 968 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 969 face->root.internal->incremental_interface->object, 970 glyph_index, TRUE, &metrics ); 971 if ( error ) 972 goto Exit; 973 top_bearing = (FT_Short)metrics.bearing_y; 974 advance_height = (FT_UShort)metrics.advance; 975 } 976# endif 977 978#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 979 980 loader->left_bearing = left_bearing; 981 loader->advance = advance_width; 982 loader->top_bearing = top_bearing; 983 loader->vadvance = advance_height; 984 985 if ( !loader->linear_def ) 986 { 987 loader->linear_def = 1; 988 loader->linear = advance_width; 989 } 990 } 991 992#ifdef FT_CONFIG_OPTION_INCREMENTAL 993 994 /* Set `offset' to the start of the glyph program relative to the */ 995 /* start of the 'glyf' table, and `count' to the length of the */ 996 /* glyph program in bytes. */ 997 /* */ 998 /* If we are loading glyph data via the incremental interface, set */ 999 /* the loader stream to a memory stream reading the data returned */ 1000 /* by the interface. */ 1001 1002 if ( face->root.internal->incremental_interface ) 1003 { 1004 error = face->root.internal->incremental_interface->funcs->get_glyph_data( 1005 face->root.internal->incremental_interface->object, 1006 glyph_index, &glyph_data ); 1007 if ( error ) 1008 goto Exit; 1009 1010 glyph_data_loaded = 1; 1011 offset = 0; 1012 count = glyph_data.length; 1013 1014 FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) ); 1015 FT_Stream_OpenMemory( &inc_stream, 1016 glyph_data.pointer, glyph_data.length ); 1017 1018 loader->stream = &inc_stream; 1019 } 1020 else 1021 1022#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1023 1024 { 1025 offset = face->glyph_locations[glyph_index]; 1026 count = 0; 1027 1028 if ( glyph_index < (FT_UInt)face->num_locations - 1 ) 1029 count = (FT_UInt)( face->glyph_locations[glyph_index + 1] - offset ); 1030 } 1031 1032 if ( count == 0 ) 1033 { 1034 /* as described by Frederic Loyer, these are spaces, and */ 1035 /* not the unknown glyph. */ 1036 loader->bbox.xMin = 0; 1037 loader->bbox.xMax = 0; 1038 loader->bbox.yMin = 0; 1039 loader->bbox.yMax = 0; 1040 1041 loader->pp1.x = 0; 1042 loader->pp2.x = loader->advance; 1043 loader->pp3.y = 0; 1044 loader->pp4.y = loader->pp3.y-loader->vadvance; 1045 1046#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1047 if ( ((TT_Face)(loader->face))->doblend ) 1048 { 1049 /* this must be done before scaling */ 1050 FT_Memory memory = loader->face->memory; 1051 1052 1053 error = TT_Vary_Get_Glyph_Delts( (TT_Face)(loader->face), 1054 glyph_index, &deltas, 4 ); 1055 if ( error ) 1056 goto Exit; 1057 1058 loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y; 1059 loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y; 1060 loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y; 1061 loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y; 1062 1063 FT_FREE( deltas ); 1064 } 1065#endif 1066 1067 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1068 { 1069 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1070 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1071 } 1072 1073#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1074 1075 if ( loader->exec ) 1076 loader->exec->glyphSize = 0; 1077 1078#endif 1079 1080 error = TT_Err_Ok; 1081 goto Exit; 1082 } 1083 1084 loader->byte_len = (FT_Int)count; 1085 1086 offset = loader->glyf_offset + offset; 1087 1088 /* access glyph frame */ 1089 error = face->access_glyph_frame( loader, glyph_index, offset, count ); 1090 if ( error ) 1091 goto Exit; 1092 1093 opened_frame = 1; 1094 1095 /* read first glyph header */ 1096 error = face->read_glyph_header( loader ); 1097 if ( error ) 1098 goto Fail; 1099 1100 contours_count = loader->n_contours; 1101 1102 count -= 10; 1103 1104 loader->pp1.x = loader->bbox.xMin - loader->left_bearing; 1105 loader->pp1.y = 0; 1106 loader->pp2.x = loader->pp1.x + loader->advance; 1107 loader->pp2.y = 0; 1108 1109 loader->pp3.x = 0; 1110 loader->pp3.y = loader->top_bearing + loader->bbox.yMax; 1111 loader->pp4.x = 0; 1112 loader->pp4.y = loader->pp3.y - loader->vadvance; 1113 1114 /***********************************************************************/ 1115 /***********************************************************************/ 1116 /***********************************************************************/ 1117 1118 /* if it is a simple glyph, load it */ 1119 1120 if ( contours_count >= 0 ) 1121 { 1122 /* check that we can add the contours to the glyph */ 1123 error = FT_GlyphLoader_CheckPoints( gloader, 0, contours_count ); 1124 if ( error ) 1125 goto Fail; 1126 1127 error = face->read_simple_glyph( loader ); 1128 if ( error ) 1129 goto Fail; 1130 1131#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1132 1133 { 1134 TT_Size size = (TT_Size)loader->size; 1135 1136 1137 error = TT_Process_Simple_Glyph( loader, 1138 (FT_Bool)( size && size->debug ) ); 1139 } 1140 1141#else 1142 1143 error = TT_Process_Simple_Glyph( loader, 0 ); 1144 1145#endif 1146 1147 if ( error ) 1148 goto Fail; 1149 1150 FT_GlyphLoader_Add( gloader ); 1151 1152 /* Note: We could have put the simple loader source there */ 1153 /* but the code is fat enough already :-) */ 1154 } 1155 1156 /***********************************************************************/ 1157 /***********************************************************************/ 1158 /***********************************************************************/ 1159 1160 /* otherwise, load a composite! */ 1161 else if ( contours_count == -1 ) 1162 { 1163 TT_GlyphSlot glyph = (TT_GlyphSlot)loader->glyph; 1164 FT_UInt start_point; 1165#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1166 FT_UInt start_contour; 1167 FT_ULong ins_pos; /* position of composite instructions, if any */ 1168#endif 1169 1170 1171 /* for each subglyph, read composite header */ 1172 start_point = gloader->base.outline.n_points; 1173#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1174 start_contour = gloader->base.outline.n_contours; 1175#endif 1176 1177 error = face->read_composite_glyph( loader ); 1178 if ( error ) 1179 goto Fail; 1180 1181#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1182 ins_pos = loader->ins_pos; 1183#endif 1184 face->forget_glyph_frame( loader ); 1185 opened_frame = 0; 1186 1187#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 1188 1189 if ( face->doblend ) 1190 { 1191 FT_Int i, limit; 1192 FT_SubGlyph subglyph; 1193 FT_Memory memory = face->root.memory; 1194 1195 1196 /* this provides additional offsets */ 1197 /* for each component's translation */ 1198 1199 if ( (error = TT_Vary_Get_Glyph_Deltas( 1200 face, 1201 glyph_index, 1202 &deltas, 1203 gloader->current.num_subglyphs + 4 )) != 0 ) 1204 goto Exit; 1205 1206 /* Note: No subglyph reallocation here, our pointers are stable. */ 1207 subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs; 1208 limit = gloader->current.num_subglyphs; 1209 1210 for ( i = 0; i < limit; ++i, ++subglyph ) 1211 { 1212 if ( subglyph->flags & ARGS_ARE_XY_VALUES ) 1213 { 1214 subglyph->arg1 += deltas[i].x; 1215 subglyph->arg2 += deltas[i].y; 1216 } 1217 } 1218 1219 loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y; 1220 loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y; 1221 loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y; 1222 loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y; 1223 1224 FT_FREE( deltas ); 1225 } 1226 1227#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ 1228 1229 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1230 { 1231 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); 1232 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); 1233 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); 1234 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); 1235 } 1236 1237 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ 1238 /* `as is' in the glyph slot (the client application will be */ 1239 /* responsible for interpreting these data)... */ 1240 /* */ 1241 if ( loader->load_flags & FT_LOAD_NO_RECURSE ) 1242 { 1243 /* set up remaining glyph fields */ 1244 FT_GlyphLoader_Add( gloader ); 1245 1246 glyph->num_subglyphs = gloader->base.num_subglyphs; 1247 glyph->format = FT_GLYPH_FORMAT_COMPOSITE; 1248 glyph->subglyphs = gloader->base.subglyphs; 1249 1250 goto Exit; 1251 } 1252 1253 /*********************************************************************/ 1254 /*********************************************************************/ 1255 /*********************************************************************/ 1256 1257 /* Now, read each subglyph independently. */ 1258 { 1259 FT_Int n, num_base_points, num_new_points; 1260 FT_SubGlyph subglyph = 0; 1261 1262 FT_UInt num_subglyphs = gloader->current.num_subglyphs; 1263 FT_UInt num_base_subgs = gloader->base.num_subglyphs; 1264 1265 1266 FT_GlyphLoader_Add( gloader ); 1267 1268 for ( n = 0; n < (FT_Int)num_subglyphs; n++ ) 1269 { 1270 FT_Vector pp1, pp2, pp3, pp4; 1271 FT_Pos x, y; 1272 1273 1274 /* Each time we call load_truetype_glyph in this loop, the */ 1275 /* value of `gloader.base.subglyphs' can change due to table */ 1276 /* reallocations. We thus need to recompute the subglyph */ 1277 /* pointer on each iteration. */ 1278 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1279 1280 pp1 = loader->pp1; 1281 pp2 = loader->pp2; 1282 pp3 = loader->pp3; 1283 pp4 = loader->pp4; 1284 1285 num_base_points = gloader->base.outline.n_points; 1286 1287 error = load_truetype_glyph( loader, subglyph->index, 1288 recurse_count + 1 ); 1289 if ( error ) 1290 goto Fail; 1291 1292 /* restore subglyph pointer */ 1293 subglyph = gloader->base.subglyphs + num_base_subgs + n; 1294 1295 if ( subglyph->flags & USE_MY_METRICS ) 1296 { 1297 pp1 = loader->pp1; 1298 pp2 = loader->pp2; 1299 pp3 = loader->pp3; 1300 pp4 = loader->pp4; 1301 } 1302 else 1303 { 1304 loader->pp1 = pp1; 1305 loader->pp2 = pp2; 1306 loader->pp3 = pp3; 1307 loader->pp4 = pp4; 1308 } 1309 1310 num_points = gloader->base.outline.n_points; 1311 1312 num_new_points = num_points - num_base_points; 1313 1314 /* now perform the transform required for this subglyph */ 1315 1316 if ( subglyph->flags & ( WE_HAVE_A_SCALE | 1317 WE_HAVE_AN_XY_SCALE | 1318 WE_HAVE_A_2X2 ) ) 1319 { 1320 FT_Vector* cur = gloader->base.outline.points + 1321 num_base_points; 1322 FT_Vector* org = gloader->base.extra_points + 1323 num_base_points; 1324 FT_Vector* limit = cur + num_new_points; 1325 1326 1327 for ( ; cur < limit; cur++, org++ ) 1328 { 1329 FT_Vector_Transform( cur, &subglyph->transform ); 1330 FT_Vector_Transform( org, &subglyph->transform ); 1331 } 1332 } 1333 1334 /* apply offset */ 1335 1336 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) 1337 { 1338 FT_UInt k = subglyph->arg1; 1339 FT_UInt l = subglyph->arg2; 1340 FT_Vector* p1; 1341 FT_Vector* p2; 1342 1343 1344 if ( start_point + k >= (FT_UInt)num_base_points || 1345 l >= (FT_UInt)num_new_points ) 1346 { 1347 error = TT_Err_Invalid_Composite; 1348 goto Fail; 1349 } 1350 1351 l += num_base_points; 1352 1353 p1 = gloader->base.outline.points + start_point + k; 1354 p2 = gloader->base.outline.points + start_point + l; 1355 1356 x = p1->x - p2->x; 1357 y = p1->y - p2->y; 1358 } 1359 else 1360 { 1361 x = subglyph->arg1; 1362 y = subglyph->arg2; 1363 1364 /* Use a default value dependent on */ 1365 /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */ 1366 /* fonts which don't set the xxx_COMPONENT_OFFSET bit. */ 1367 1368#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED 1369 if ( !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) && 1370#else 1371 if ( ( subglyph->flags & SCALED_COMPONENT_OFFSET ) && 1372#endif 1373 ( subglyph->flags & ( WE_HAVE_A_SCALE | 1374 WE_HAVE_AN_XY_SCALE | 1375 WE_HAVE_A_2X2 )) ) 1376 { 1377#if 0 1378 1379 /*************************************************************************/ 1380 /* */ 1381 /* This algorithm is what Apple documents. But it doesn't work. */ 1382 /* */ 1383 int a = subglyph->transform.xx > 0 ? subglyph->transform.xx 1384 : -subglyph->transform.xx; 1385 int b = subglyph->transform.yx > 0 ? subglyph->transform.yx 1386 : -subglyph->transform.yx; 1387 int c = subglyph->transform.xy > 0 ? subglyph->transform.xy 1388 : -subglyph->transform.xy; 1389 int d = subglyph->transform.yy > 0 ? subglyph->transform.yy 1390 : -subglyph->transform.yy; 1391 int m = a > b ? a : b; 1392 int n = c > d ? c : d; 1393 1394 1395 if ( a - b <= 33 && a - b >= -33 ) 1396 m *= 2; 1397 if ( c - d <= 33 && c - d >= -33 ) 1398 n *= 2; 1399 x = FT_MulFix( x, m ); 1400 y = FT_MulFix( y, n ); 1401 1402#else /* 0 */ 1403 1404 /*************************************************************************/ 1405 /* */ 1406 /* This algorithm is a guess and works much better than the above. */ 1407 /* */ 1408 FT_Fixed mac_xscale = FT_SqrtFixed( 1409 FT_MulFix( subglyph->transform.xx, 1410 subglyph->transform.xx ) + 1411 FT_MulFix( subglyph->transform.xy, 1412 subglyph->transform.xy) ); 1413 FT_Fixed mac_yscale = FT_SqrtFixed( 1414 FT_MulFix( subglyph->transform.yy, 1415 subglyph->transform.yy ) + 1416 FT_MulFix( subglyph->transform.yx, 1417 subglyph->transform.yx ) ); 1418 1419 1420 x = FT_MulFix( x, mac_xscale ); 1421 y = FT_MulFix( y, mac_yscale ); 1422#endif /* 0 */ 1423 1424 } 1425 1426 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1427 { 1428 x = FT_MulFix( x, x_scale ); 1429 y = FT_MulFix( y, y_scale ); 1430 1431 if ( subglyph->flags & ROUND_XY_TO_GRID ) 1432 { 1433 x = FT_PIX_ROUND( x ); 1434 y = FT_PIX_ROUND( y ); 1435 } 1436 } 1437 } 1438 1439 if ( x || y ) 1440 { 1441 translate_array( num_new_points, 1442 gloader->base.outline.points + num_base_points, 1443 x, y ); 1444 1445 translate_array( num_new_points, 1446 gloader->base.extra_points + num_base_points, 1447 x, y ); 1448 } 1449 } 1450 1451 /*******************************************************************/ 1452 /*******************************************************************/ 1453 /*******************************************************************/ 1454 1455 /* we have finished loading all sub-glyphs; now, look for */ 1456 /* instructions for this composite! */ 1457 1458#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1459 1460 if ( num_subglyphs > 0 && 1461 loader->exec && 1462 ins_pos > 0 && 1463 subglyph->flags & WE_HAVE_INSTR ) 1464 { 1465 FT_UShort n_ins; 1466 TT_ExecContext exec = loader->exec; 1467 TT_GlyphZone pts; 1468 FT_Vector* pp1; 1469 1470 1471 /* read size of instructions */ 1472 if ( FT_STREAM_SEEK( ins_pos ) || 1473 FT_READ_USHORT( n_ins ) ) 1474 goto Fail; 1475 FT_TRACE5(( " Instructions size = %d\n", n_ins )); 1476 1477 /* in some fonts? */ 1478 if ( n_ins == 0xFFFFU ) 1479 n_ins = 0; 1480 1481 /* check it */ 1482 if ( n_ins > face->max_profile.maxSizeOfInstructions ) 1483 { 1484 FT_TRACE0(( "Too many instructions (%d) in composite glyph %ld\n", 1485 n_ins, subglyph->index )); 1486 error = TT_Err_Too_Many_Hints; 1487 goto Fail; 1488 } 1489 1490 /* read the instructions */ 1491 if ( FT_STREAM_READ( exec->glyphIns, n_ins ) ) 1492 goto Fail; 1493 1494 glyph->control_data = exec->glyphIns; 1495 glyph->control_len = n_ins; 1496 1497 error = TT_Set_CodeRange( exec, 1498 tt_coderange_glyph, 1499 exec->glyphIns, 1500 n_ins ); 1501 if ( error ) 1502 goto Fail; 1503 1504 error = FT_GlyphLoader_CheckPoints( gloader, num_points + 4, 0 ); 1505 if ( error ) 1506 goto Fail; 1507 1508 /* prepare the execution context */ 1509 tt_prepare_zone( &exec->pts, &gloader->base, 1510 start_point, start_contour ); 1511 pts = &exec->pts; 1512 1513 pts->n_points = (short)( num_points + 4 ); 1514 pts->n_contours = gloader->base.outline.n_contours; 1515 1516 /* add phantom points */ 1517 pp1 = pts->cur + num_points; 1518 pp1[0] = loader->pp1; 1519 pp1[1] = loader->pp2; 1520 pp1[2] = loader->pp3; 1521 pp1[3] = loader->pp4; 1522 1523 pts->tags[num_points ] = 0; 1524 pts->tags[num_points + 1] = 0; 1525 pts->tags[num_points + 2] = 0; 1526 pts->tags[num_points + 3] = 0; 1527 1528 /* if hinting, round the phantom points */ 1529 if ( IS_HINTED( loader->load_flags ) ) 1530 { 1531 pp1[0].x = FT_PIX_ROUND( loader->pp1.x ); 1532 pp1[1].x = FT_PIX_ROUND( loader->pp2.x ); 1533 pp1[2].y = FT_PIX_ROUND( loader->pp3.y ); 1534 pp1[3].y = FT_PIX_ROUND( loader->pp4.y ); 1535 } 1536 1537 { 1538 FT_UInt k; 1539 1540 1541 for ( k = 0; k < num_points; k++ ) 1542 pts->tags[k] &= FT_CURVE_TAG_ON; 1543 } 1544 1545 cur_to_org( num_points + 4, pts ); 1546 1547 /* now consider hinting */ 1548 if ( IS_HINTED( loader->load_flags ) && n_ins > 0 ) 1549 { 1550 exec->is_composite = TRUE; 1551 exec->pedantic_hinting = 1552 (FT_Bool)( loader->load_flags & FT_LOAD_PEDANTIC ); 1553 error = TT_Run_Context( exec, ((TT_Size)loader->size)->debug ); 1554 if ( error && exec->pedantic_hinting ) 1555 goto Fail; 1556 } 1557 1558 /* save glyph origin and advance points */ 1559 loader->pp1 = pp1[0]; 1560 loader->pp2 = pp1[1]; 1561 loader->pp3 = pp1[2]; 1562 loader->pp4 = pp1[3]; 1563 } 1564 1565#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1566 1567 } 1568 /* end of composite loading */ 1569 } 1570 else 1571 { 1572 /* invalid composite count ( negative but not -1 ) */ 1573 error = TT_Err_Invalid_Outline; 1574 goto Fail; 1575 } 1576 1577 /***********************************************************************/ 1578 /***********************************************************************/ 1579 /***********************************************************************/ 1580 1581 Fail: 1582 if ( opened_frame ) 1583 face->forget_glyph_frame( loader ); 1584 1585 Exit: 1586 1587#ifdef FT_CONFIG_OPTION_INCREMENTAL 1588 if ( glyph_data_loaded ) 1589 face->root.internal->incremental_interface->funcs->free_glyph_data( 1590 face->root.internal->incremental_interface->object, 1591 &glyph_data ); 1592#endif 1593 1594 return error; 1595 } 1596 1597 1598 static FT_Error 1599 compute_glyph_metrics( TT_Loader loader, 1600 FT_UInt glyph_index ) 1601 { 1602 FT_BBox bbox; 1603 TT_Face face = (TT_Face)loader->face; 1604 FT_Fixed y_scale; 1605 TT_GlyphSlot glyph = loader->glyph; 1606 TT_Size size = (TT_Size)loader->size; 1607 1608 1609 y_scale = 0x10000L; 1610 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) 1611 y_scale = size->root.metrics.y_scale; 1612 1613 if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE ) 1614 { 1615 glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS; 1616 1617 /* copy outline to our glyph slot */ 1618 FT_GlyphLoader_CopyPoints( glyph->internal->loader, loader->gloader ); 1619 glyph->outline = glyph->internal->loader->base.outline; 1620 1621 /* translate array so that (0,0) is the glyph's origin */ 1622 FT_Outline_Translate( &glyph->outline, -loader->pp1.x, 0 ); 1623 1624 FT_Outline_Get_CBox( &glyph->outline, &bbox ); 1625 1626 if ( IS_HINTED( loader->load_flags ) ) 1627 { 1628 /* grid-fit the bounding box */ 1629 bbox.xMin = FT_PIX_FLOOR( bbox.xMin ); 1630 bbox.yMin = FT_PIX_FLOOR( bbox.yMin ); 1631 bbox.xMax = FT_PIX_CEIL( bbox.xMax ); 1632 bbox.yMax = FT_PIX_CEIL( bbox.yMax ); 1633 } 1634 } 1635 else 1636 bbox = loader->bbox; 1637 1638 /* get the device-independent horizontal advance. It is scaled later */ 1639 /* by the base layer. */ 1640 { 1641 FT_Pos advance = loader->linear; 1642 1643 1644 /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */ 1645 /* correctly support DynaLab fonts, which have an incorrect */ 1646 /* `advance_Width_Max' field! It is used, to my knowledge, */ 1647 /* exclusively in the X-TrueType font server. */ 1648 /* */ 1649 if ( face->postscript.isFixedPitch && 1650 ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 ) 1651 advance = face->horizontal.advance_Width_Max; 1652 1653 /* we need to return the advance in font units in linearHoriAdvance, */ 1654 /* it will be scaled later by the base layer. */ 1655 glyph->linearHoriAdvance = advance; 1656 } 1657 1658 glyph->metrics.horiBearingX = bbox.xMin; 1659 glyph->metrics.horiBearingY = bbox.yMax; 1660 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; 1661 1662 /* don't forget to hint the advance when we need to */ 1663 if ( IS_HINTED( loader->load_flags ) ) 1664 glyph->metrics.horiAdvance = FT_PIX_ROUND( glyph->metrics.horiAdvance ); 1665 1666 /* Now take care of vertical metrics. In the case where there is */ 1667 /* no vertical information within the font (relatively common), make */ 1668 /* up some metrics by `hand'... */ 1669 1670 { 1671 FT_Short top_bearing; /* vertical top side bearing (EM units) */ 1672 FT_UShort advance_height; /* vertical advance height (EM units) */ 1673 1674 FT_Pos left; /* scaled vertical left side bearing */ 1675 FT_Pos top; /* scaled vertical top side bearing */ 1676 FT_Pos advance; /* scaled vertical advance height */ 1677 1678 1679 /* Get the unscaled top bearing and advance height. */ 1680 if ( face->vertical_info && 1681 face->vertical.number_Of_VMetrics > 0 ) 1682 { 1683 advance_height = (FT_UShort)( loader->pp4.y - loader->pp3.y ); 1684 top_bearing = (FT_Short)( loader->pp3.y - bbox.yMax ); 1685 } 1686 else 1687 { 1688 /* Make up the distances from the horizontal header. */ 1689 1690 /* NOTE: The OS/2 values are the only `portable' ones, */ 1691 /* which is why we use them, if there is an OS/2 */ 1692 /* table in the font. Otherwise, we use the */ 1693 /* values defined in the horizontal header. */ 1694 /* */ 1695 /* NOTE2: The sTypoDescender is negative, which is why */ 1696 /* we compute the baseline-to-baseline distance */ 1697 /* here with: */ 1698 /* ascender - descender + linegap */ 1699 /* */ 1700 /* NOTE3: This is different from what MS's rasterizer */ 1701 /* appears to do when getting default values */ 1702 /* for the vertical phantom points. We leave */ 1703 /* the old code untouched, but relying on */ 1704 /* phantom points alone might be reasonable */ 1705 /* (i.e., removing the `if' above). */ 1706 if ( face->os2.version != 0xFFFFU ) 1707 { 1708 top_bearing = (FT_Short)( face->os2.sTypoLineGap / 2 ); 1709 advance_height = (FT_UShort)( face->os2.sTypoAscender - 1710 face->os2.sTypoDescender + 1711 face->os2.sTypoLineGap ); 1712 } 1713 else 1714 { 1715 top_bearing = (FT_Short)( face->horizontal.Line_Gap / 2 ); 1716 advance_height = (FT_UShort)( face->horizontal.Ascender + 1717 face->horizontal.Descender + 1718 face->horizontal.Line_Gap ); 1719 } 1720 } 1721 1722#ifdef FT_CONFIG_OPTION_INCREMENTAL 1723 1724 /* If this is an incrementally loaded font see if there are */ 1725 /* overriding metrics for this glyph. */ 1726 if ( face->root.internal->incremental_interface && 1727 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 1728 { 1729 FT_Incremental_MetricsRec metrics; 1730 FT_Error error = 0; 1731 1732 1733 metrics.bearing_x = 0; 1734 metrics.bearing_y = top_bearing; 1735 metrics.advance = advance_height; 1736 error = 1737 face->root.internal->incremental_interface->funcs->get_glyph_metrics( 1738 face->root.internal->incremental_interface->object, 1739 glyph_index, TRUE, &metrics ); 1740 1741 if ( error ) 1742 return error; 1743 1744 top_bearing = (FT_Short)metrics.bearing_y; 1745 advance_height = (FT_UShort)metrics.advance; 1746 } 1747 1748 /* GWW: Do vertical metrics get loaded incrementally too? */ 1749 1750#endif /* FT_CONFIG_OPTION_INCREMENTAL */ 1751 1752 /* We must adjust the top_bearing value from the bounding box given */ 1753 /* in the glyph header to the bounding box calculated with */ 1754 /* FT_Get_Outline_CBox(). */ 1755 1756 /* scale the metrics */ 1757 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) 1758 { 1759 top = FT_MulFix( top_bearing + loader->bbox.yMax, y_scale ) 1760 - bbox.yMax; 1761 advance = FT_MulFix( advance_height, y_scale ); 1762 } 1763 else 1764 { 1765 top = top_bearing + loader->bbox.yMax - bbox.yMax; 1766 advance = advance_height; 1767 } 1768 1769 /* set the advance height in design units. It is scaled later by */ 1770 /* the base layer. */ 1771 glyph->linearVertAdvance = advance_height; 1772 1773 /* XXX: for now, we have no better algorithm for the lsb, but it */ 1774 /* should work fine. */ 1775 /* */ 1776 left = ( bbox.xMin - bbox.xMax ) / 2; 1777 1778 /* grid-fit them if necessary */ 1779 if ( IS_HINTED( loader->load_flags ) ) 1780 { 1781 left = FT_PIX_FLOOR( left ); 1782 top = FT_PIX_CEIL( top ); 1783 advance = FT_PIX_ROUND( advance ); 1784 } 1785 1786 glyph->metrics.vertBearingX = left; 1787 glyph->metrics.vertBearingY = top; 1788 glyph->metrics.vertAdvance = advance; 1789 } 1790 1791 /* adjust advance width to the value contained in the hdmx table */ 1792 if ( !face->postscript.isFixedPitch && size && 1793 IS_HINTED( loader->load_flags ) ) 1794 { 1795 FT_Byte* widths = Get_Advance_Widths( face, 1796 size->root.metrics.x_ppem ); 1797 1798 1799 if ( widths ) 1800 glyph->metrics.horiAdvance = widths[glyph_index] << 6; 1801 } 1802 1803 /* set glyph dimensions */ 1804 glyph->metrics.width = bbox.xMax - bbox.xMin; 1805 glyph->metrics.height = bbox.yMax - bbox.yMin; 1806 1807 return 0; 1808 } 1809 1810 1811 /*************************************************************************/ 1812 /* */ 1813 /* <Function> */ 1814 /* TT_Load_Glyph */ 1815 /* */ 1816 /* <Description> */ 1817 /* A function used to load a single glyph within a given glyph slot, */ 1818 /* for a given size. */ 1819 /* */ 1820 /* <Input> */ 1821 /* glyph :: A handle to a target slot object where the glyph */ 1822 /* will be loaded. */ 1823 /* */ 1824 /* size :: A handle to the source face size at which the glyph */ 1825 /* must be scaled/loaded. */ 1826 /* */ 1827 /* glyph_index :: The index of the glyph in the font file. */ 1828 /* */ 1829 /* load_flags :: A flag indicating what to load for this glyph. The */ 1830 /* FT_LOAD_XXX constants can be used to control the */ 1831 /* glyph loading process (e.g., whether the outline */ 1832 /* should be scaled, whether to load bitmaps or not, */ 1833 /* whether to hint the outline, etc). */ 1834 /* */ 1835 /* <Return> */ 1836 /* FreeType error code. 0 means success. */ 1837 /* */ 1838 FT_LOCAL_DEF( FT_Error ) 1839 TT_Load_Glyph( TT_Size size, 1840 TT_GlyphSlot glyph, 1841 FT_UInt glyph_index, 1842 FT_Int32 load_flags ) 1843 { 1844 SFNT_Service sfnt; 1845 TT_Face face; 1846 FT_Stream stream; 1847 FT_Error error; 1848 TT_LoaderRec loader; 1849 1850 1851 face = (TT_Face)glyph->face; 1852 sfnt = (SFNT_Service)face->sfnt; 1853 stream = face->root.stream; 1854 error = 0; 1855 1856 if ( !size || ( load_flags & FT_LOAD_NO_SCALE ) || 1857 ( load_flags & FT_LOAD_NO_RECURSE ) ) 1858 { 1859 size = NULL; 1860 load_flags |= FT_LOAD_NO_SCALE | 1861 FT_LOAD_NO_HINTING | 1862 FT_LOAD_NO_BITMAP; 1863 } 1864 1865 glyph->num_subglyphs = 0; 1866 1867#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 1868 1869 /* try to load embedded bitmap if any */ 1870 /* */ 1871 /* XXX: The convention should be emphasized in */ 1872 /* the documents because it can be confusing. */ 1873 if ( size && 1874 size->strike_index != 0xFFFFU && 1875 sfnt->load_sbits && 1876 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 1877 1878 { 1879 TT_SBit_MetricsRec metrics; 1880 1881 1882 error = sfnt->load_sbit_image( face, 1883 (FT_ULong)size->strike_index, 1884 glyph_index, 1885 (FT_Int)load_flags, 1886 stream, 1887 &glyph->bitmap, 1888 &metrics ); 1889 if ( !error ) 1890 { 1891 glyph->outline.n_points = 0; 1892 glyph->outline.n_contours = 0; 1893 1894 glyph->metrics.width = (FT_Pos)metrics.width << 6; 1895 glyph->metrics.height = (FT_Pos)metrics.height << 6; 1896 1897 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 1898 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 1899 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 1900 1901 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 1902 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 1903 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 1904 1905 glyph->format = FT_GLYPH_FORMAT_BITMAP; 1906 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 1907 { 1908 glyph->bitmap_left = metrics.vertBearingX; 1909 glyph->bitmap_top = metrics.vertBearingY; 1910 } 1911 else 1912 { 1913 glyph->bitmap_left = metrics.horiBearingX; 1914 glyph->bitmap_top = metrics.horiBearingY; 1915 } 1916 return error; 1917 } 1918 } 1919 1920#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 1921 1922 /* return immediately if we only want the embedded bitmaps */ 1923 if ( load_flags & FT_LOAD_SBITS_ONLY ) 1924 return TT_Err_Invalid_Argument; 1925 1926 /* seek to the beginning of the glyph table. For Type 42 fonts */ 1927 /* the table might be accessed from a Postscript stream or something */ 1928 /* else... */ 1929 1930#ifdef FT_CONFIG_OPTION_INCREMENTAL 1931 1932 /* Don't look for the glyph table if this is an incremental font. */ 1933 if ( !face->root.internal->incremental_interface ) 1934 1935#endif 1936 1937 { 1938 error = face->goto_table( face, TTAG_glyf, stream, 0 ); 1939 if ( error ) 1940 { 1941 FT_ERROR(( "TT_Load_Glyph: could not access glyph table\n" )); 1942 goto Exit; 1943 } 1944 } 1945 1946 FT_MEM_ZERO( &loader, sizeof ( loader ) ); 1947 1948 /* update the glyph zone bounds */ 1949 { 1950 FT_GlyphLoader gloader = FT_FACE_DRIVER(face)->glyph_loader; 1951 1952 1953 loader.gloader = gloader; 1954 1955 FT_GlyphLoader_Rewind( gloader ); 1956 1957 tt_prepare_zone( &loader.zone, &gloader->base, 0, 0 ); 1958 tt_prepare_zone( &loader.base, &gloader->base, 0, 0 ); 1959 } 1960 1961#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 1962 1963 if ( size ) 1964 { 1965 /* query new execution context */ 1966 loader.exec = size->debug ? size->context : TT_New_Context( face ); 1967 if ( !loader.exec ) 1968 return TT_Err_Could_Not_Find_Context; 1969 1970 TT_Load_Context( loader.exec, face, size ); 1971 loader.instructions = loader.exec->glyphIns; 1972 1973 /* load default graphics state - if needed */ 1974 if ( size->GS.instruct_control & 2 ) 1975 loader.exec->GS = tt_default_graphics_state; 1976 } 1977 1978#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 1979 1980 /* clear all outline flags, except the `owner' one */ 1981 glyph->outline.flags = 0; 1982 1983 /* let's initialize the rest of our loader now */ 1984 1985 loader.load_flags = load_flags; 1986 1987 loader.face = (FT_Face)face; 1988 loader.size = (FT_Size)size; 1989 loader.glyph = (FT_GlyphSlot)glyph; 1990 loader.stream = stream; 1991 1992#ifdef FT_CONFIG_OPTION_INCREMENTAL 1993 1994 if ( face->root.internal->incremental_interface ) 1995 loader.glyf_offset = 0; 1996 else 1997 1998#endif 1999 2000 loader.glyf_offset = FT_STREAM_POS(); 2001 2002#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 2003 2004 /* if the cvt program has disabled hinting, the argument */ 2005 /* is ignored. */ 2006 if ( size && ( size->GS.instruct_control & 1 ) ) 2007 loader.load_flags |= FT_LOAD_NO_HINTING; 2008 2009#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 2010 2011 /* Main loading loop */ 2012 glyph->format = FT_GLYPH_FORMAT_OUTLINE; 2013 glyph->num_subglyphs = 0; 2014 2015 error = load_truetype_glyph( &loader, glyph_index, 0 ); 2016 if ( !error ) 2017 compute_glyph_metrics( &loader, glyph_index ); 2018 2019#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER 2020 2021 if ( !size || !size->debug ) 2022 TT_Done_Context( loader.exec ); 2023 2024#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 2025 2026 /* Set the `high precision' bit flag. */ 2027 /* This is _critical_ to get correct output for monochrome */ 2028 /* TrueType glyphs at all sizes using the bytecode interpreter. */ 2029 /* */ 2030 if ( size && size->root.metrics.y_ppem < 24 ) 2031 glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; 2032 2033 Exit: 2034 return error; 2035 } 2036 2037 2038/* END */ 2039