1 /***************************************************************************/ 2 /* */ 3 /* cffgload.c */ 4 /* */ 5 /* OpenType Glyph Loader (body). */ 6 /* */ 7 /* Copyright 1996-2012 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_STREAM_H 22 #include FT_INTERNAL_SFNT_H 23 #include FT_OUTLINE_H 24 25 #include "cffobjs.h" 26 #include "cffload.h" 27 #include "cffgload.h" 28 29 #include "cfferrs.h" 30 31 32 /*************************************************************************/ 33 /* */ 34 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 35 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 36 /* messages during execution. */ 37 /* */ 38 #undef FT_COMPONENT 39 #define FT_COMPONENT trace_cffgload 40 41 42 typedef enum CFF_Operator_ 43 { 44 cff_op_unknown = 0, 45 46 cff_op_rmoveto, 47 cff_op_hmoveto, 48 cff_op_vmoveto, 49 50 cff_op_rlineto, 51 cff_op_hlineto, 52 cff_op_vlineto, 53 54 cff_op_rrcurveto, 55 cff_op_hhcurveto, 56 cff_op_hvcurveto, 57 cff_op_rcurveline, 58 cff_op_rlinecurve, 59 cff_op_vhcurveto, 60 cff_op_vvcurveto, 61 62 cff_op_flex, 63 cff_op_hflex, 64 cff_op_hflex1, 65 cff_op_flex1, 66 67 cff_op_endchar, 68 69 cff_op_hstem, 70 cff_op_vstem, 71 cff_op_hstemhm, 72 cff_op_vstemhm, 73 74 cff_op_hintmask, 75 cff_op_cntrmask, 76 cff_op_dotsection, /* deprecated, acts as no-op */ 77 78 cff_op_abs, 79 cff_op_add, 80 cff_op_sub, 81 cff_op_div, 82 cff_op_neg, 83 cff_op_random, 84 cff_op_mul, 85 cff_op_sqrt, 86 87 cff_op_blend, 88 89 cff_op_drop, 90 cff_op_exch, 91 cff_op_index, 92 cff_op_roll, 93 cff_op_dup, 94 95 cff_op_put, 96 cff_op_get, 97 cff_op_store, 98 cff_op_load, 99 100 cff_op_and, 101 cff_op_or, 102 cff_op_not, 103 cff_op_eq, 104 cff_op_ifelse, 105 106 cff_op_callsubr, 107 cff_op_callgsubr, 108 cff_op_return, 109 110 /* Type 1 opcodes: invalid but seen in real life */ 111 cff_op_hsbw, 112 cff_op_closepath, 113 cff_op_callothersubr, 114 cff_op_pop, 115 cff_op_seac, 116 cff_op_sbw, 117 cff_op_setcurrentpoint, 118 119 /* do not remove */ 120 cff_op_max 121 122 } CFF_Operator; 123 124 125 #define CFF_COUNT_CHECK_WIDTH 0x80 126 #define CFF_COUNT_EXACT 0x40 127 #define CFF_COUNT_CLEAR_STACK 0x20 128 129 /* count values which have the `CFF_COUNT_CHECK_WIDTH' flag set are */ 130 /* used for checking the width and requested numbers of arguments */ 131 /* only; they are set to zero afterwards */ 132 133 /* the other two flags are informative only and unused currently */ 134 135 static const FT_Byte cff_argument_counts[] = 136 { 137 0, /* unknown */ 138 139 2 | CFF_COUNT_CHECK_WIDTH | CFF_COUNT_EXACT, /* rmoveto */ 140 1 | CFF_COUNT_CHECK_WIDTH | CFF_COUNT_EXACT, 141 1 | CFF_COUNT_CHECK_WIDTH | CFF_COUNT_EXACT, 142 143 0 | CFF_COUNT_CLEAR_STACK, /* rlineto */ 144 0 | CFF_COUNT_CLEAR_STACK, 145 0 | CFF_COUNT_CLEAR_STACK, 146 147 0 | CFF_COUNT_CLEAR_STACK, /* rrcurveto */ 148 0 | CFF_COUNT_CLEAR_STACK, 149 0 | CFF_COUNT_CLEAR_STACK, 150 0 | CFF_COUNT_CLEAR_STACK, 151 0 | CFF_COUNT_CLEAR_STACK, 152 0 | CFF_COUNT_CLEAR_STACK, 153 0 | CFF_COUNT_CLEAR_STACK, 154 155 13, /* flex */ 156 7, 157 9, 158 11, 159 160 0 | CFF_COUNT_CHECK_WIDTH, /* endchar */ 161 162 2 | CFF_COUNT_CHECK_WIDTH, /* hstem */ 163 2 | CFF_COUNT_CHECK_WIDTH, 164 2 | CFF_COUNT_CHECK_WIDTH, 165 2 | CFF_COUNT_CHECK_WIDTH, 166 167 0 | CFF_COUNT_CHECK_WIDTH, /* hintmask */ 168 0 | CFF_COUNT_CHECK_WIDTH, /* cntrmask */ 169 0, /* dotsection */ 170 171 1, /* abs */ 172 2, 173 2, 174 2, 175 1, 176 0, 177 2, 178 1, 179 180 1, /* blend */ 181 182 1, /* drop */ 183 2, 184 1, 185 2, 186 1, 187 188 2, /* put */ 189 1, 190 4, 191 3, 192 193 2, /* and */ 194 2, 195 1, 196 2, 197 4, 198 199 1, /* callsubr */ 200 1, 201 0, 202 203 2, /* hsbw */ 204 0, 205 0, 206 0, 207 5, /* seac */ 208 4, /* sbw */ 209 2 /* setcurrentpoint */ 210 }; 211 212 213 /*************************************************************************/ 214 /*************************************************************************/ 215 /*************************************************************************/ 216 /********** *********/ 217 /********** *********/ 218 /********** GENERIC CHARSTRING PARSING *********/ 219 /********** *********/ 220 /********** *********/ 221 /*************************************************************************/ 222 /*************************************************************************/ 223 /*************************************************************************/ 224 225 226 /*************************************************************************/ 227 /* */ 228 /* <Function> */ 229 /* cff_builder_init */ 230 /* */ 231 /* <Description> */ 232 /* Initializes a given glyph builder. */ 233 /* */ 234 /* <InOut> */ 235 /* builder :: A pointer to the glyph builder to initialize. */ 236 /* */ 237 /* <Input> */ 238 /* face :: The current face object. */ 239 /* */ 240 /* size :: The current size object. */ 241 /* */ 242 /* glyph :: The current glyph object. */ 243 /* */ 244 /* hinting :: Whether hinting is active. */ 245 /* */ 246 static void 247 cff_builder_init( CFF_Builder* builder, 248 TT_Face face, 249 CFF_Size size, 250 CFF_GlyphSlot glyph, 251 FT_Bool hinting ) 252 { 253 builder->path_begun = 0; 254 builder->load_points = 1; 255 256 builder->face = face; 257 builder->glyph = glyph; 258 builder->memory = face->root.memory; 259 260 if ( glyph ) 261 { 262 FT_GlyphLoader loader = glyph->root.internal->loader; 263 264 265 builder->loader = loader; 266 builder->base = &loader->base.outline; 267 builder->current = &loader->current.outline; 268 FT_GlyphLoader_Rewind( loader ); 269 270 builder->hints_globals = 0; 271 builder->hints_funcs = 0; 272 273 if ( hinting && size ) 274 { 275 CFF_Internal internal = (CFF_Internal)size->root.internal; 276 277 278 builder->hints_globals = (void *)internal->topfont; 279 builder->hints_funcs = glyph->root.internal->glyph_hints; 280 } 281 } 282 283 builder->pos_x = 0; 284 builder->pos_y = 0; 285 286 builder->left_bearing.x = 0; 287 builder->left_bearing.y = 0; 288 builder->advance.x = 0; 289 builder->advance.y = 0; 290 } 291 292 293 /*************************************************************************/ 294 /* */ 295 /* <Function> */ 296 /* cff_builder_done */ 297 /* */ 298 /* <Description> */ 299 /* Finalizes a given glyph builder. Its contents can still be used */ 300 /* after the call, but the function saves important information */ 301 /* within the corresponding glyph slot. */ 302 /* */ 303 /* <Input> */ 304 /* builder :: A pointer to the glyph builder to finalize. */ 305 /* */ 306 static void 307 cff_builder_done( CFF_Builder* builder ) 308 { 309 CFF_GlyphSlot glyph = builder->glyph; 310 311 312 if ( glyph ) 313 glyph->root.outline = *builder->base; 314 } 315 316 317 /*************************************************************************/ 318 /* */ 319 /* <Function> */ 320 /* cff_compute_bias */ 321 /* */ 322 /* <Description> */ 323 /* Computes the bias value in dependence of the number of glyph */ 324 /* subroutines. */ 325 /* */ 326 /* <Input> */ 327 /* in_charstring_type :: The `CharstringType' value of the top DICT */ 328 /* dictionary. */ 329 /* */ 330 /* num_subrs :: The number of glyph subroutines. */ 331 /* */ 332 /* <Return> */ 333 /* The bias value. */ 334 static FT_Int 335 cff_compute_bias( FT_Int in_charstring_type, 336 FT_UInt num_subrs ) 337 { 338 FT_Int result; 339 340 341 if ( in_charstring_type == 1 ) 342 result = 0; 343 else if ( num_subrs < 1240 ) 344 result = 107; 345 else if ( num_subrs < 33900U ) 346 result = 1131; 347 else 348 result = 32768U; 349 350 return result; 351 } 352 353 354 /*************************************************************************/ 355 /* */ 356 /* <Function> */ 357 /* cff_decoder_init */ 358 /* */ 359 /* <Description> */ 360 /* Initializes a given glyph decoder. */ 361 /* */ 362 /* <InOut> */ 363 /* decoder :: A pointer to the glyph builder to initialize. */ 364 /* */ 365 /* <Input> */ 366 /* face :: The current face object. */ 367 /* */ 368 /* size :: The current size object. */ 369 /* */ 370 /* slot :: The current glyph object. */ 371 /* */ 372 /* hinting :: Whether hinting is active. */ 373 /* */ 374 /* hint_mode :: The hinting mode. */ 375 /* */ 376 FT_LOCAL_DEF( void ) 377 cff_decoder_init( CFF_Decoder* decoder, 378 TT_Face face, 379 CFF_Size size, 380 CFF_GlyphSlot slot, 381 FT_Bool hinting, 382 FT_Render_Mode hint_mode ) 383 { 384 CFF_Font cff = (CFF_Font)face->extra.data; 385 386 387 /* clear everything */ 388 FT_MEM_ZERO( decoder, sizeof ( *decoder ) ); 389 390 /* initialize builder */ 391 cff_builder_init( &decoder->builder, face, size, slot, hinting ); 392 393 /* initialize Type2 decoder */ 394 decoder->cff = cff; 395 decoder->num_globals = cff->global_subrs_index.count; 396 decoder->globals = cff->global_subrs; 397 decoder->globals_bias = cff_compute_bias( 398 cff->top_font.font_dict.charstring_type, 399 decoder->num_globals ); 400 401 decoder->hint_mode = hint_mode; 402 } 403 404 405 /* this function is used to select the subfont */ 406 /* and the locals subrs array */ 407 FT_LOCAL_DEF( FT_Error ) 408 cff_decoder_prepare( CFF_Decoder* decoder, 409 CFF_Size size, 410 FT_UInt glyph_index ) 411 { 412 CFF_Builder *builder = &decoder->builder; 413 CFF_Font cff = (CFF_Font)builder->face->extra.data; 414 CFF_SubFont sub = &cff->top_font; 415 FT_Error error = CFF_Err_Ok; 416 417 418 /* manage CID fonts */ 419 if ( cff->num_subfonts ) 420 { 421 FT_Byte fd_index = cff_fd_select_get( &cff->fd_select, glyph_index ); 422 423 424 if ( fd_index >= cff->num_subfonts ) 425 { 426 FT_TRACE4(( "cff_decoder_prepare: invalid CID subfont index\n" )); 427 error = CFF_Err_Invalid_File_Format; 428 goto Exit; 429 } 430 431 FT_TRACE3(( "glyph index %d (subfont %d):\n", glyph_index, fd_index )); 432 433 sub = cff->subfonts[fd_index]; 434 435 if ( builder->hints_funcs && size ) 436 { 437 CFF_Internal internal = (CFF_Internal)size->root.internal; 438 439 440 /* for CFFs without subfonts, this value has already been set */ 441 builder->hints_globals = (void *)internal->subfonts[fd_index]; 442 } 443 } 444 #ifdef FT_DEBUG_LEVEL_TRACE 445 else 446 FT_TRACE3(( "glyph index %d:\n", glyph_index )); 447 #endif 448 449 decoder->num_locals = sub->local_subrs_index.count; 450 decoder->locals = sub->local_subrs; 451 decoder->locals_bias = cff_compute_bias( 452 decoder->cff->top_font.font_dict.charstring_type, 453 decoder->num_locals ); 454 455 decoder->glyph_width = sub->private_dict.default_width; 456 decoder->nominal_width = sub->private_dict.nominal_width; 457 458 Exit: 459 return error; 460 } 461 462 463 /* check that there is enough space for `count' more points */ 464 static FT_Error 465 check_points( CFF_Builder* builder, 466 FT_Int count ) 467 { 468 return FT_GLYPHLOADER_CHECK_POINTS( builder->loader, count, 0 ); 469 } 470 471 472 /* add a new point, do not check space */ 473 static void 474 cff_builder_add_point( CFF_Builder* builder, 475 FT_Pos x, 476 FT_Pos y, 477 FT_Byte flag ) 478 { 479 FT_Outline* outline = builder->current; 480 481 482 if ( builder->load_points ) 483 { 484 FT_Vector* point = outline->points + outline->n_points; 485 FT_Byte* control = (FT_Byte*)outline->tags + outline->n_points; 486 487 488 point->x = x >> 16; 489 point->y = y >> 16; 490 *control = (FT_Byte)( flag ? FT_CURVE_TAG_ON : FT_CURVE_TAG_CUBIC ); 491 } 492 493 outline->n_points++; 494 } 495 496 497 /* check space for a new on-curve point, then add it */ 498 static FT_Error 499 cff_builder_add_point1( CFF_Builder* builder, 500 FT_Pos x, 501 FT_Pos y ) 502 { 503 FT_Error error; 504 505 506 error = check_points( builder, 1 ); 507 if ( !error ) 508 cff_builder_add_point( builder, x, y, 1 ); 509 510 return error; 511 } 512 513 514 /* check space for a new contour, then add it */ 515 static FT_Error 516 cff_builder_add_contour( CFF_Builder* builder ) 517 { 518 FT_Outline* outline = builder->current; 519 FT_Error error; 520 521 522 if ( !builder->load_points ) 523 { 524 outline->n_contours++; 525 return CFF_Err_Ok; 526 } 527 528 error = FT_GLYPHLOADER_CHECK_POINTS( builder->loader, 0, 1 ); 529 if ( !error ) 530 { 531 if ( outline->n_contours > 0 ) 532 outline->contours[outline->n_contours - 1] = 533 (short)( outline->n_points - 1 ); 534 535 outline->n_contours++; 536 } 537 538 return error; 539 } 540 541 542 /* if a path was begun, add its first on-curve point */ 543 static FT_Error 544 cff_builder_start_point( CFF_Builder* builder, 545 FT_Pos x, 546 FT_Pos y ) 547 { 548 FT_Error error = CFF_Err_Ok; 549 550 551 /* test whether we are building a new contour */ 552 if ( !builder->path_begun ) 553 { 554 builder->path_begun = 1; 555 error = cff_builder_add_contour( builder ); 556 if ( !error ) 557 error = cff_builder_add_point1( builder, x, y ); 558 } 559 560 return error; 561 } 562 563 564 /* close the current contour */ 565 static void 566 cff_builder_close_contour( CFF_Builder* builder ) 567 { 568 FT_Outline* outline = builder->current; 569 FT_Int first; 570 571 572 if ( !outline ) 573 return; 574 575 first = outline->n_contours <= 1 576 ? 0 : outline->contours[outline->n_contours - 2] + 1; 577 578 /* We must not include the last point in the path if it */ 579 /* is located on the first point. */ 580 if ( outline->n_points > 1 ) 581 { 582 FT_Vector* p1 = outline->points + first; 583 FT_Vector* p2 = outline->points + outline->n_points - 1; 584 FT_Byte* control = (FT_Byte*)outline->tags + outline->n_points - 1; 585 586 587 /* `delete' last point only if it coincides with the first */ 588 /* point and if it is not a control point (which can happen). */ 589 if ( p1->x == p2->x && p1->y == p2->y ) 590 if ( *control == FT_CURVE_TAG_ON ) 591 outline->n_points--; 592 } 593 594 if ( outline->n_contours > 0 ) 595 { 596 /* Don't add contours only consisting of one point, i.e., */ 597 /* check whether begin point and last point are the same. */ 598 if ( first == outline->n_points - 1 ) 599 { 600 outline->n_contours--; 601 outline->n_points--; 602 } 603 else 604 outline->contours[outline->n_contours - 1] = 605 (short)( outline->n_points - 1 ); 606 } 607 } 608 609 610 static FT_Int 611 cff_lookup_glyph_by_stdcharcode( CFF_Font cff, 612 FT_Int charcode ) 613 { 614 FT_UInt n; 615 FT_UShort glyph_sid; 616 617 618 /* CID-keyed fonts don't have glyph names */ 619 if ( !cff->charset.sids ) 620 return -1; 621 622 /* check range of standard char code */ 623 if ( charcode < 0 || charcode > 255 ) 624 return -1; 625 626 /* Get code to SID mapping from `cff_standard_encoding'. */ 627 glyph_sid = cff_get_standard_encoding( (FT_UInt)charcode ); 628 629 for ( n = 0; n < cff->num_glyphs; n++ ) 630 { 631 if ( cff->charset.sids[n] == glyph_sid ) 632 return n; 633 } 634 635 return -1; 636 } 637 638 639 static FT_Error 640 cff_get_glyph_data( TT_Face face, 641 FT_UInt glyph_index, 642 FT_Byte** pointer, 643 FT_ULong* length ) 644 { 645 #ifdef FT_CONFIG_OPTION_INCREMENTAL 646 /* For incremental fonts get the character data using the */ 647 /* callback function. */ 648 if ( face->root.internal->incremental_interface ) 649 { 650 FT_Data data; 651 FT_Error error = 652 face->root.internal->incremental_interface->funcs->get_glyph_data( 653 face->root.internal->incremental_interface->object, 654 glyph_index, &data ); 655 656 657 *pointer = (FT_Byte*)data.pointer; 658 *length = data.length; 659 660 return error; 661 } 662 else 663 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 664 665 { 666 CFF_Font cff = (CFF_Font)(face->extra.data); 667 668 669 return cff_index_access_element( &cff->charstrings_index, glyph_index, 670 pointer, length ); 671 } 672 } 673 674 675 static void 676 cff_free_glyph_data( TT_Face face, 677 FT_Byte** pointer, 678 FT_ULong length ) 679 { 680 #ifndef FT_CONFIG_OPTION_INCREMENTAL 681 FT_UNUSED( length ); 682 #endif 683 684 #ifdef FT_CONFIG_OPTION_INCREMENTAL 685 /* For incremental fonts get the character data using the */ 686 /* callback function. */ 687 if ( face->root.internal->incremental_interface ) 688 { 689 FT_Data data; 690 691 692 data.pointer = *pointer; 693 data.length = length; 694 695 face->root.internal->incremental_interface->funcs->free_glyph_data( 696 face->root.internal->incremental_interface->object, &data ); 697 } 698 else 699 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 700 701 { 702 CFF_Font cff = (CFF_Font)(face->extra.data); 703 704 705 cff_index_forget_element( &cff->charstrings_index, pointer ); 706 } 707 } 708 709 710 static FT_Error 711 cff_operator_seac( CFF_Decoder* decoder, 712 FT_Pos asb, 713 FT_Pos adx, 714 FT_Pos ady, 715 FT_Int bchar, 716 FT_Int achar ) 717 { 718 FT_Error error; 719 CFF_Builder* builder = &decoder->builder; 720 FT_Int bchar_index, achar_index; 721 TT_Face face = decoder->builder.face; 722 FT_Vector left_bearing, advance; 723 FT_Byte* charstring; 724 FT_ULong charstring_len; 725 FT_Pos glyph_width; 726 727 728 if ( decoder->seac ) 729 { 730 FT_ERROR(( "cff_operator_seac: invalid nested seac\n" )); 731 return CFF_Err_Syntax_Error; 732 } 733 734 adx += decoder->builder.left_bearing.x; 735 ady += decoder->builder.left_bearing.y; 736 737 #ifdef FT_CONFIG_OPTION_INCREMENTAL 738 /* Incremental fonts don't necessarily have valid charsets. */ 739 /* They use the character code, not the glyph index, in this case. */ 740 if ( face->root.internal->incremental_interface ) 741 { 742 bchar_index = bchar; 743 achar_index = achar; 744 } 745 else 746 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 747 { 748 CFF_Font cff = (CFF_Font)(face->extra.data); 749 750 751 bchar_index = cff_lookup_glyph_by_stdcharcode( cff, bchar ); 752 achar_index = cff_lookup_glyph_by_stdcharcode( cff, achar ); 753 } 754 755 if ( bchar_index < 0 || achar_index < 0 ) 756 { 757 FT_ERROR(( "cff_operator_seac:" 758 " invalid seac character code arguments\n" )); 759 return CFF_Err_Syntax_Error; 760 } 761 762 /* If we are trying to load a composite glyph, do not load the */ 763 /* accent character and return the array of subglyphs. */ 764 if ( builder->no_recurse ) 765 { 766 FT_GlyphSlot glyph = (FT_GlyphSlot)builder->glyph; 767 FT_GlyphLoader loader = glyph->internal->loader; 768 FT_SubGlyph subg; 769 770 771 /* reallocate subglyph array if necessary */ 772 error = FT_GlyphLoader_CheckSubGlyphs( loader, 2 ); 773 if ( error ) 774 goto Exit; 775 776 subg = loader->current.subglyphs; 777 778 /* subglyph 0 = base character */ 779 subg->index = bchar_index; 780 subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES | 781 FT_SUBGLYPH_FLAG_USE_MY_METRICS; 782 subg->arg1 = 0; 783 subg->arg2 = 0; 784 subg++; 785 786 /* subglyph 1 = accent character */ 787 subg->index = achar_index; 788 subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES; 789 subg->arg1 = (FT_Int)( adx >> 16 ); 790 subg->arg2 = (FT_Int)( ady >> 16 ); 791 792 /* set up remaining glyph fields */ 793 glyph->num_subglyphs = 2; 794 glyph->subglyphs = loader->base.subglyphs; 795 glyph->format = FT_GLYPH_FORMAT_COMPOSITE; 796 797 loader->current.num_subglyphs = 2; 798 } 799 800 FT_GlyphLoader_Prepare( builder->loader ); 801 802 /* First load `bchar' in builder */ 803 error = cff_get_glyph_data( face, bchar_index, 804 &charstring, &charstring_len ); 805 if ( !error ) 806 { 807 /* the seac operator must not be nested */ 808 decoder->seac = TRUE; 809 error = cff_decoder_parse_charstrings( decoder, charstring, 810 charstring_len ); 811 decoder->seac = FALSE; 812 813 cff_free_glyph_data( face, &charstring, charstring_len ); 814 815 if ( error ) 816 goto Exit; 817 } 818 819 /* Save the left bearing, advance and glyph width of the base */ 820 /* character as they will be erased by the next load. */ 821 822 left_bearing = builder->left_bearing; 823 advance = builder->advance; 824 glyph_width = decoder->glyph_width; 825 826 builder->left_bearing.x = 0; 827 builder->left_bearing.y = 0; 828 829 builder->pos_x = adx - asb; 830 builder->pos_y = ady; 831 832 /* Now load `achar' on top of the base outline. */ 833 error = cff_get_glyph_data( face, achar_index, 834 &charstring, &charstring_len ); 835 if ( !error ) 836 { 837 /* the seac operator must not be nested */ 838 decoder->seac = TRUE; 839 error = cff_decoder_parse_charstrings( decoder, charstring, 840 charstring_len ); 841 decoder->seac = FALSE; 842 843 cff_free_glyph_data( face, &charstring, charstring_len ); 844 845 if ( error ) 846 goto Exit; 847 } 848 849 /* Restore the left side bearing, advance and glyph width */ 850 /* of the base character. */ 851 builder->left_bearing = left_bearing; 852 builder->advance = advance; 853 decoder->glyph_width = glyph_width; 854 855 builder->pos_x = 0; 856 builder->pos_y = 0; 857 858 Exit: 859 return error; 860 } 861 862 863 /*************************************************************************/ 864 /* */ 865 /* <Function> */ 866 /* cff_decoder_parse_charstrings */ 867 /* */ 868 /* <Description> */ 869 /* Parses a given Type 2 charstrings program. */ 870 /* */ 871 /* <InOut> */ 872 /* decoder :: The current Type 1 decoder. */ 873 /* */ 874 /* <Input> */ 875 /* charstring_base :: The base of the charstring stream. */ 876 /* */ 877 /* charstring_len :: The length in bytes of the charstring stream. */ 878 /* */ 879 /* <Return> */ 880 /* FreeType error code. 0 means success. */ 881 /* */ 882 FT_LOCAL_DEF( FT_Error ) 883 cff_decoder_parse_charstrings( CFF_Decoder* decoder, 884 FT_Byte* charstring_base, 885 FT_ULong charstring_len ) 886 { 887 FT_Error error; 888 CFF_Decoder_Zone* zone; 889 FT_Byte* ip; 890 FT_Byte* limit; 891 CFF_Builder* builder = &decoder->builder; 892 FT_Pos x, y; 893 FT_Fixed seed; 894 FT_Fixed* stack; 895 FT_Int charstring_type = 896 decoder->cff->top_font.font_dict.charstring_type; 897 898 T2_Hints_Funcs hinter; 899 900 901 /* set default width */ 902 decoder->num_hints = 0; 903 decoder->read_width = 1; 904 905 /* compute random seed from stack address of parameter */ 906 seed = (FT_Fixed)( ( (FT_PtrDist)(char*)&seed ^ 907 (FT_PtrDist)(char*)&decoder ^ 908 (FT_PtrDist)(char*)&charstring_base ) & 909 FT_ULONG_MAX ) ; 910 seed = ( seed ^ ( seed >> 10 ) ^ ( seed >> 20 ) ) & 0xFFFFL; 911 if ( seed == 0 ) 912 seed = 0x7384; 913 914 /* initialize the decoder */ 915 decoder->top = decoder->stack; 916 decoder->zone = decoder->zones; 917 zone = decoder->zones; 918 stack = decoder->top; 919 920 hinter = (T2_Hints_Funcs)builder->hints_funcs; 921 922 builder->path_begun = 0; 923 924 zone->base = charstring_base; 925 limit = zone->limit = charstring_base + charstring_len; 926 ip = zone->cursor = zone->base; 927 928 error = CFF_Err_Ok; 929 930 x = builder->pos_x; 931 y = builder->pos_y; 932 933 /* begin hints recording session, if any */ 934 if ( hinter ) 935 hinter->open( hinter->hints ); 936 937 /* now execute loop */ 938 while ( ip < limit ) 939 { 940 CFF_Operator op; 941 FT_Byte v; 942 943 944 /********************************************************************/ 945 /* */ 946 /* Decode operator or operand */ 947 /* */ 948 v = *ip++; 949 if ( v >= 32 || v == 28 ) 950 { 951 FT_Int shift = 16; 952 FT_Int32 val; 953 954 955 /* this is an operand, push it on the stack */ 956 if ( v == 28 ) 957 { 958 if ( ip + 1 >= limit ) 959 goto Syntax_Error; 960 val = (FT_Short)( ( (FT_Short)ip[0] << 8 ) | ip[1] ); 961 ip += 2; 962 } 963 else if ( v < 247 ) 964 val = (FT_Int32)v - 139; 965 else if ( v < 251 ) 966 { 967 if ( ip >= limit ) 968 goto Syntax_Error; 969 val = ( (FT_Int32)v - 247 ) * 256 + *ip++ + 108; 970 } 971 else if ( v < 255 ) 972 { 973 if ( ip >= limit ) 974 goto Syntax_Error; 975 val = -( (FT_Int32)v - 251 ) * 256 - *ip++ - 108; 976 } 977 else 978 { 979 if ( ip + 3 >= limit ) 980 goto Syntax_Error; 981 val = ( (FT_Int32)ip[0] << 24 ) | 982 ( (FT_Int32)ip[1] << 16 ) | 983 ( (FT_Int32)ip[2] << 8 ) | 984 ip[3]; 985 ip += 4; 986 if ( charstring_type == 2 ) 987 shift = 0; 988 } 989 if ( decoder->top - stack >= CFF_MAX_OPERANDS ) 990 goto Stack_Overflow; 991 992 val <<= shift; 993 *decoder->top++ = val; 994 995 #ifdef FT_DEBUG_LEVEL_TRACE 996 if ( !( val & 0xFFFFL ) ) 997 FT_TRACE4(( " %ld", (FT_Int32)( val >> 16 ) )); 998 else 999 FT_TRACE4(( " %.2f", val / 65536.0 )); 1000 #endif 1001 1002 } 1003 else 1004 { 1005 /* The specification says that normally arguments are to be taken */ 1006 /* from the bottom of the stack. However, this seems not to be */ 1007 /* correct, at least for Acroread 7.0.8 on GNU/Linux: It pops the */ 1008 /* arguments similar to a PS interpreter. */ 1009 1010 FT_Fixed* args = decoder->top; 1011 FT_Int num_args = (FT_Int)( args - decoder->stack ); 1012 FT_Int req_args; 1013 1014 1015 /* find operator */ 1016 op = cff_op_unknown; 1017 1018 switch ( v ) 1019 { 1020 case 1: 1021 op = cff_op_hstem; 1022 break; 1023 case 3: 1024 op = cff_op_vstem; 1025 break; 1026 case 4: 1027 op = cff_op_vmoveto; 1028 break; 1029 case 5: 1030 op = cff_op_rlineto; 1031 break; 1032 case 6: 1033 op = cff_op_hlineto; 1034 break; 1035 case 7: 1036 op = cff_op_vlineto; 1037 break; 1038 case 8: 1039 op = cff_op_rrcurveto; 1040 break; 1041 case 9: 1042 op = cff_op_closepath; 1043 break; 1044 case 10: 1045 op = cff_op_callsubr; 1046 break; 1047 case 11: 1048 op = cff_op_return; 1049 break; 1050 case 12: 1051 { 1052 if ( ip >= limit ) 1053 goto Syntax_Error; 1054 v = *ip++; 1055 1056 switch ( v ) 1057 { 1058 case 0: 1059 op = cff_op_dotsection; 1060 break; 1061 case 1: /* this is actually the Type1 vstem3 operator */ 1062 op = cff_op_vstem; 1063 break; 1064 case 2: /* this is actually the Type1 hstem3 operator */ 1065 op = cff_op_hstem; 1066 break; 1067 case 3: 1068 op = cff_op_and; 1069 break; 1070 case 4: 1071 op = cff_op_or; 1072 break; 1073 case 5: 1074 op = cff_op_not; 1075 break; 1076 case 6: 1077 op = cff_op_seac; 1078 break; 1079 case 7: 1080 op = cff_op_sbw; 1081 break; 1082 case 8: 1083 op = cff_op_store; 1084 break; 1085 case 9: 1086 op = cff_op_abs; 1087 break; 1088 case 10: 1089 op = cff_op_add; 1090 break; 1091 case 11: 1092 op = cff_op_sub; 1093 break; 1094 case 12: 1095 op = cff_op_div; 1096 break; 1097 case 13: 1098 op = cff_op_load; 1099 break; 1100 case 14: 1101 op = cff_op_neg; 1102 break; 1103 case 15: 1104 op = cff_op_eq; 1105 break; 1106 case 16: 1107 op = cff_op_callothersubr; 1108 break; 1109 case 17: 1110 op = cff_op_pop; 1111 break; 1112 case 18: 1113 op = cff_op_drop; 1114 break; 1115 case 20: 1116 op = cff_op_put; 1117 break; 1118 case 21: 1119 op = cff_op_get; 1120 break; 1121 case 22: 1122 op = cff_op_ifelse; 1123 break; 1124 case 23: 1125 op = cff_op_random; 1126 break; 1127 case 24: 1128 op = cff_op_mul; 1129 break; 1130 case 26: 1131 op = cff_op_sqrt; 1132 break; 1133 case 27: 1134 op = cff_op_dup; 1135 break; 1136 case 28: 1137 op = cff_op_exch; 1138 break; 1139 case 29: 1140 op = cff_op_index; 1141 break; 1142 case 30: 1143 op = cff_op_roll; 1144 break; 1145 case 33: 1146 op = cff_op_setcurrentpoint; 1147 break; 1148 case 34: 1149 op = cff_op_hflex; 1150 break; 1151 case 35: 1152 op = cff_op_flex; 1153 break; 1154 case 36: 1155 op = cff_op_hflex1; 1156 break; 1157 case 37: 1158 op = cff_op_flex1; 1159 break; 1160 default: 1161 FT_TRACE4(( " unknown op (12, %d)\n", v )); 1162 break; 1163 } 1164 } 1165 break; 1166 case 13: 1167 op = cff_op_hsbw; 1168 break; 1169 case 14: 1170 op = cff_op_endchar; 1171 break; 1172 case 16: 1173 op = cff_op_blend; 1174 break; 1175 case 18: 1176 op = cff_op_hstemhm; 1177 break; 1178 case 19: 1179 op = cff_op_hintmask; 1180 break; 1181 case 20: 1182 op = cff_op_cntrmask; 1183 break; 1184 case 21: 1185 op = cff_op_rmoveto; 1186 break; 1187 case 22: 1188 op = cff_op_hmoveto; 1189 break; 1190 case 23: 1191 op = cff_op_vstemhm; 1192 break; 1193 case 24: 1194 op = cff_op_rcurveline; 1195 break; 1196 case 25: 1197 op = cff_op_rlinecurve; 1198 break; 1199 case 26: 1200 op = cff_op_vvcurveto; 1201 break; 1202 case 27: 1203 op = cff_op_hhcurveto; 1204 break; 1205 case 29: 1206 op = cff_op_callgsubr; 1207 break; 1208 case 30: 1209 op = cff_op_vhcurveto; 1210 break; 1211 case 31: 1212 op = cff_op_hvcurveto; 1213 break; 1214 default: 1215 FT_TRACE4(( " unknown op (%d)\n", v )); 1216 break; 1217 } 1218 1219 if ( op == cff_op_unknown ) 1220 continue; 1221 1222 /* check arguments */ 1223 req_args = cff_argument_counts[op]; 1224 if ( req_args & CFF_COUNT_CHECK_WIDTH ) 1225 { 1226 if ( num_args > 0 && decoder->read_width ) 1227 { 1228 /* If `nominal_width' is non-zero, the number is really a */ 1229 /* difference against `nominal_width'. Else, the number here */ 1230 /* is truly a width, not a difference against `nominal_width'. */ 1231 /* If the font does not set `nominal_width', then */ 1232 /* `nominal_width' defaults to zero, and so we can set */ 1233 /* `glyph_width' to `nominal_width' plus number on the stack */ 1234 /* -- for either case. */ 1235 1236 FT_Int set_width_ok; 1237 1238 1239 switch ( op ) 1240 { 1241 case cff_op_hmoveto: 1242 case cff_op_vmoveto: 1243 set_width_ok = num_args & 2; 1244 break; 1245 1246 case cff_op_hstem: 1247 case cff_op_vstem: 1248 case cff_op_hstemhm: 1249 case cff_op_vstemhm: 1250 case cff_op_rmoveto: 1251 case cff_op_hintmask: 1252 case cff_op_cntrmask: 1253 set_width_ok = num_args & 1; 1254 break; 1255 1256 case cff_op_endchar: 1257 /* If there is a width specified for endchar, we either have */ 1258 /* 1 argument or 5 arguments. We like to argue. */ 1259 set_width_ok = ( num_args == 5 ) || ( num_args == 1 ); 1260 break; 1261 1262 default: 1263 set_width_ok = 0; 1264 break; 1265 } 1266 1267 if ( set_width_ok ) 1268 { 1269 decoder->glyph_width = decoder->nominal_width + 1270 ( stack[0] >> 16 ); 1271 1272 if ( decoder->width_only ) 1273 { 1274 /* we only want the advance width; stop here */ 1275 break; 1276 } 1277 1278 /* Consumed an argument. */ 1279 num_args--; 1280 } 1281 } 1282 1283 decoder->read_width = 0; 1284 req_args = 0; 1285 } 1286 1287 req_args &= 0x000F; 1288 if ( num_args < req_args ) 1289 goto Stack_Underflow; 1290 args -= req_args; 1291 num_args -= req_args; 1292 1293 /* At this point, `args' points to the first argument of the */ 1294 /* operand in case `req_args' isn't zero. Otherwise, we have */ 1295 /* to adjust `args' manually. */ 1296 1297 /* Note that we only pop arguments from the stack which we */ 1298 /* really need and can digest so that we can continue in case */ 1299 /* of superfluous stack elements. */ 1300 1301 switch ( op ) 1302 { 1303 case cff_op_hstem: 1304 case cff_op_vstem: 1305 case cff_op_hstemhm: 1306 case cff_op_vstemhm: 1307 /* the number of arguments is always even here */ 1308 FT_TRACE4(( 1309 op == cff_op_hstem ? " hstem\n" : 1310 ( op == cff_op_vstem ? " vstem\n" : 1311 ( op == cff_op_hstemhm ? " hstemhm\n" : " vstemhm\n" ) ) )); 1312 1313 if ( hinter ) 1314 hinter->stems( hinter->hints, 1315 ( op == cff_op_hstem || op == cff_op_hstemhm ), 1316 num_args / 2, 1317 args - ( num_args & ~1 ) ); 1318 1319 decoder->num_hints += num_args / 2; 1320 args = stack; 1321 break; 1322 1323 case cff_op_hintmask: 1324 case cff_op_cntrmask: 1325 FT_TRACE4(( op == cff_op_hintmask ? " hintmask" : " cntrmask" )); 1326 1327 /* implement vstem when needed -- */ 1328 /* the specification doesn't say it, but this also works */ 1329 /* with the 'cntrmask' operator */ 1330 /* */ 1331 if ( num_args > 0 ) 1332 { 1333 if ( hinter ) 1334 hinter->stems( hinter->hints, 1335 0, 1336 num_args / 2, 1337 args - ( num_args & ~1 ) ); 1338 1339 decoder->num_hints += num_args / 2; 1340 } 1341 1342 /* In a valid charstring there must be at least one byte */ 1343 /* after `hintmask' or `cntrmask' (e.g., for a `return' */ 1344 /* instruction). Additionally, there must be space for */ 1345 /* `num_hints' bits. */ 1346 1347 if ( ( ip + ( ( decoder->num_hints + 7 ) >> 3 ) ) >= limit ) 1348 goto Syntax_Error; 1349 1350 if ( hinter ) 1351 { 1352 if ( op == cff_op_hintmask ) 1353 hinter->hintmask( hinter->hints, 1354 builder->current->n_points, 1355 decoder->num_hints, 1356 ip ); 1357 else 1358 hinter->counter( hinter->hints, 1359 decoder->num_hints, 1360 ip ); 1361 } 1362 1363 #ifdef FT_DEBUG_LEVEL_TRACE 1364 { 1365 FT_UInt maskbyte; 1366 1367 1368 FT_TRACE4(( " (maskbytes:" )); 1369 1370 for ( maskbyte = 0; 1371 maskbyte < (FT_UInt)( ( decoder->num_hints + 7 ) >> 3 ); 1372 maskbyte++, ip++ ) 1373 FT_TRACE4(( " 0x%02X", *ip )); 1374 1375 FT_TRACE4(( ")\n" )); 1376 } 1377 #else 1378 ip += ( decoder->num_hints + 7 ) >> 3; 1379 #endif 1380 args = stack; 1381 break; 1382 1383 case cff_op_rmoveto: 1384 FT_TRACE4(( " rmoveto\n" )); 1385 1386 cff_builder_close_contour( builder ); 1387 builder->path_begun = 0; 1388 x += args[-2]; 1389 y += args[-1]; 1390 args = stack; 1391 break; 1392 1393 case cff_op_vmoveto: 1394 FT_TRACE4(( " vmoveto\n" )); 1395 1396 cff_builder_close_contour( builder ); 1397 builder->path_begun = 0; 1398 y += args[-1]; 1399 args = stack; 1400 break; 1401 1402 case cff_op_hmoveto: 1403 FT_TRACE4(( " hmoveto\n" )); 1404 1405 cff_builder_close_contour( builder ); 1406 builder->path_begun = 0; 1407 x += args[-1]; 1408 args = stack; 1409 break; 1410 1411 case cff_op_rlineto: 1412 FT_TRACE4(( " rlineto\n" )); 1413 1414 if ( cff_builder_start_point ( builder, x, y ) || 1415 check_points( builder, num_args / 2 ) ) 1416 goto Fail; 1417 1418 if ( num_args < 2 ) 1419 goto Stack_Underflow; 1420 1421 args -= num_args & ~1; 1422 while ( args < decoder->top ) 1423 { 1424 x += args[0]; 1425 y += args[1]; 1426 cff_builder_add_point( builder, x, y, 1 ); 1427 args += 2; 1428 } 1429 args = stack; 1430 break; 1431 1432 case cff_op_hlineto: 1433 case cff_op_vlineto: 1434 { 1435 FT_Int phase = ( op == cff_op_hlineto ); 1436 1437 1438 FT_TRACE4(( op == cff_op_hlineto ? " hlineto\n" 1439 : " vlineto\n" )); 1440 1441 if ( num_args < 0 ) 1442 goto Stack_Underflow; 1443 1444 /* there exist subsetted fonts (found in PDFs) */ 1445 /* which call `hlineto' without arguments */ 1446 if ( num_args == 0 ) 1447 break; 1448 1449 if ( cff_builder_start_point ( builder, x, y ) || 1450 check_points( builder, num_args ) ) 1451 goto Fail; 1452 1453 args = stack; 1454 while ( args < decoder->top ) 1455 { 1456 if ( phase ) 1457 x += args[0]; 1458 else 1459 y += args[0]; 1460 1461 if ( cff_builder_add_point1( builder, x, y ) ) 1462 goto Fail; 1463 1464 args++; 1465 phase ^= 1; 1466 } 1467 args = stack; 1468 } 1469 break; 1470 1471 case cff_op_rrcurveto: 1472 { 1473 FT_Int nargs; 1474 1475 1476 FT_TRACE4(( " rrcurveto\n" )); 1477 1478 if ( num_args < 6 ) 1479 goto Stack_Underflow; 1480 1481 nargs = num_args - num_args % 6; 1482 1483 if ( cff_builder_start_point ( builder, x, y ) || 1484 check_points( builder, nargs / 2 ) ) 1485 goto Fail; 1486 1487 args -= nargs; 1488 while ( args < decoder->top ) 1489 { 1490 x += args[0]; 1491 y += args[1]; 1492 cff_builder_add_point( builder, x, y, 0 ); 1493 x += args[2]; 1494 y += args[3]; 1495 cff_builder_add_point( builder, x, y, 0 ); 1496 x += args[4]; 1497 y += args[5]; 1498 cff_builder_add_point( builder, x, y, 1 ); 1499 args += 6; 1500 } 1501 args = stack; 1502 } 1503 break; 1504 1505 case cff_op_vvcurveto: 1506 { 1507 FT_Int nargs; 1508 1509 1510 FT_TRACE4(( " vvcurveto\n" )); 1511 1512 if ( num_args < 4 ) 1513 goto Stack_Underflow; 1514 1515 /* if num_args isn't of the form 4n or 4n+1, */ 1516 /* we enforce it by clearing the second bit */ 1517 1518 nargs = num_args & ~2; 1519 1520 if ( cff_builder_start_point( builder, x, y ) ) 1521 goto Fail; 1522 1523 args -= nargs; 1524 1525 if ( nargs & 1 ) 1526 { 1527 x += args[0]; 1528 args++; 1529 nargs--; 1530 } 1531 1532 if ( check_points( builder, 3 * ( nargs / 4 ) ) ) 1533 goto Fail; 1534 1535 while ( args < decoder->top ) 1536 { 1537 y += args[0]; 1538 cff_builder_add_point( builder, x, y, 0 ); 1539 x += args[1]; 1540 y += args[2]; 1541 cff_builder_add_point( builder, x, y, 0 ); 1542 y += args[3]; 1543 cff_builder_add_point( builder, x, y, 1 ); 1544 args += 4; 1545 } 1546 args = stack; 1547 } 1548 break; 1549 1550 case cff_op_hhcurveto: 1551 { 1552 FT_Int nargs; 1553 1554 1555 FT_TRACE4(( " hhcurveto\n" )); 1556 1557 if ( num_args < 4 ) 1558 goto Stack_Underflow; 1559 1560 /* if num_args isn't of the form 4n or 4n+1, */ 1561 /* we enforce it by clearing the second bit */ 1562 1563 nargs = num_args & ~2; 1564 1565 if ( cff_builder_start_point( builder, x, y ) ) 1566 goto Fail; 1567 1568 args -= nargs; 1569 if ( nargs & 1 ) 1570 { 1571 y += args[0]; 1572 args++; 1573 nargs--; 1574 } 1575 1576 if ( check_points( builder, 3 * ( nargs / 4 ) ) ) 1577 goto Fail; 1578 1579 while ( args < decoder->top ) 1580 { 1581 x += args[0]; 1582 cff_builder_add_point( builder, x, y, 0 ); 1583 x += args[1]; 1584 y += args[2]; 1585 cff_builder_add_point( builder, x, y, 0 ); 1586 x += args[3]; 1587 cff_builder_add_point( builder, x, y, 1 ); 1588 args += 4; 1589 } 1590 args = stack; 1591 } 1592 break; 1593 1594 case cff_op_vhcurveto: 1595 case cff_op_hvcurveto: 1596 { 1597 FT_Int phase; 1598 FT_Int nargs; 1599 1600 1601 FT_TRACE4(( op == cff_op_vhcurveto ? " vhcurveto\n" 1602 : " hvcurveto\n" )); 1603 1604 if ( cff_builder_start_point( builder, x, y ) ) 1605 goto Fail; 1606 1607 if ( num_args < 4 ) 1608 goto Stack_Underflow; 1609 1610 /* if num_args isn't of the form 8n, 8n+1, 8n+4, or 8n+5, */ 1611 /* we enforce it by clearing the second bit */ 1612 1613 nargs = num_args & ~2; 1614 1615 args -= nargs; 1616 if ( check_points( builder, ( nargs / 4 ) * 3 ) ) 1617 goto Stack_Underflow; 1618 1619 phase = ( op == cff_op_hvcurveto ); 1620 1621 while ( nargs >= 4 ) 1622 { 1623 nargs -= 4; 1624 if ( phase ) 1625 { 1626 x += args[0]; 1627 cff_builder_add_point( builder, x, y, 0 ); 1628 x += args[1]; 1629 y += args[2]; 1630 cff_builder_add_point( builder, x, y, 0 ); 1631 y += args[3]; 1632 if ( nargs == 1 ) 1633 x += args[4]; 1634 cff_builder_add_point( builder, x, y, 1 ); 1635 } 1636 else 1637 { 1638 y += args[0]; 1639 cff_builder_add_point( builder, x, y, 0 ); 1640 x += args[1]; 1641 y += args[2]; 1642 cff_builder_add_point( builder, x, y, 0 ); 1643 x += args[3]; 1644 if ( nargs == 1 ) 1645 y += args[4]; 1646 cff_builder_add_point( builder, x, y, 1 ); 1647 } 1648 args += 4; 1649 phase ^= 1; 1650 } 1651 args = stack; 1652 } 1653 break; 1654 1655 case cff_op_rlinecurve: 1656 { 1657 FT_Int num_lines; 1658 FT_Int nargs; 1659 1660 1661 FT_TRACE4(( " rlinecurve\n" )); 1662 1663 if ( num_args < 8 ) 1664 goto Stack_Underflow; 1665 1666 nargs = num_args & ~1; 1667 num_lines = ( nargs - 6 ) / 2; 1668 1669 if ( cff_builder_start_point( builder, x, y ) || 1670 check_points( builder, num_lines + 3 ) ) 1671 goto Fail; 1672 1673 args -= nargs; 1674 1675 /* first, add the line segments */ 1676 while ( num_lines > 0 ) 1677 { 1678 x += args[0]; 1679 y += args[1]; 1680 cff_builder_add_point( builder, x, y, 1 ); 1681 args += 2; 1682 num_lines--; 1683 } 1684 1685 /* then the curve */ 1686 x += args[0]; 1687 y += args[1]; 1688 cff_builder_add_point( builder, x, y, 0 ); 1689 x += args[2]; 1690 y += args[3]; 1691 cff_builder_add_point( builder, x, y, 0 ); 1692 x += args[4]; 1693 y += args[5]; 1694 cff_builder_add_point( builder, x, y, 1 ); 1695 args = stack; 1696 } 1697 break; 1698 1699 case cff_op_rcurveline: 1700 { 1701 FT_Int num_curves; 1702 FT_Int nargs; 1703 1704 1705 FT_TRACE4(( " rcurveline\n" )); 1706 1707 if ( num_args < 8 ) 1708 goto Stack_Underflow; 1709 1710 nargs = num_args - 2; 1711 nargs = nargs - nargs % 6 + 2; 1712 num_curves = ( nargs - 2 ) / 6; 1713 1714 if ( cff_builder_start_point ( builder, x, y ) || 1715 check_points( builder, num_curves * 3 + 2 ) ) 1716 goto Fail; 1717 1718 args -= nargs; 1719 1720 /* first, add the curves */ 1721 while ( num_curves > 0 ) 1722 { 1723 x += args[0]; 1724 y += args[1]; 1725 cff_builder_add_point( builder, x, y, 0 ); 1726 x += args[2]; 1727 y += args[3]; 1728 cff_builder_add_point( builder, x, y, 0 ); 1729 x += args[4]; 1730 y += args[5]; 1731 cff_builder_add_point( builder, x, y, 1 ); 1732 args += 6; 1733 num_curves--; 1734 } 1735 1736 /* then the final line */ 1737 x += args[0]; 1738 y += args[1]; 1739 cff_builder_add_point( builder, x, y, 1 ); 1740 args = stack; 1741 } 1742 break; 1743 1744 case cff_op_hflex1: 1745 { 1746 FT_Pos start_y; 1747 1748 1749 FT_TRACE4(( " hflex1\n" )); 1750 1751 /* adding five more points: 4 control points, 1 on-curve point */ 1752 /* -- make sure we have enough space for the start point if it */ 1753 /* needs to be added */ 1754 if ( cff_builder_start_point( builder, x, y ) || 1755 check_points( builder, 6 ) ) 1756 goto Fail; 1757 1758 /* record the starting point's y position for later use */ 1759 start_y = y; 1760 1761 /* first control point */ 1762 x += args[0]; 1763 y += args[1]; 1764 cff_builder_add_point( builder, x, y, 0 ); 1765 1766 /* second control point */ 1767 x += args[2]; 1768 y += args[3]; 1769 cff_builder_add_point( builder, x, y, 0 ); 1770 1771 /* join point; on curve, with y-value the same as the last */ 1772 /* control point's y-value */ 1773 x += args[4]; 1774 cff_builder_add_point( builder, x, y, 1 ); 1775 1776 /* third control point, with y-value the same as the join */ 1777 /* point's y-value */ 1778 x += args[5]; 1779 cff_builder_add_point( builder, x, y, 0 ); 1780 1781 /* fourth control point */ 1782 x += args[6]; 1783 y += args[7]; 1784 cff_builder_add_point( builder, x, y, 0 ); 1785 1786 /* ending point, with y-value the same as the start */ 1787 x += args[8]; 1788 y = start_y; 1789 cff_builder_add_point( builder, x, y, 1 ); 1790 1791 args = stack; 1792 break; 1793 } 1794 1795 case cff_op_hflex: 1796 { 1797 FT_Pos start_y; 1798 1799 1800 FT_TRACE4(( " hflex\n" )); 1801 1802 /* adding six more points; 4 control points, 2 on-curve points */ 1803 if ( cff_builder_start_point( builder, x, y ) || 1804 check_points( builder, 6 ) ) 1805 goto Fail; 1806 1807 /* record the starting point's y-position for later use */ 1808 start_y = y; 1809 1810 /* first control point */ 1811 x += args[0]; 1812 cff_builder_add_point( builder, x, y, 0 ); 1813 1814 /* second control point */ 1815 x += args[1]; 1816 y += args[2]; 1817 cff_builder_add_point( builder, x, y, 0 ); 1818 1819 /* join point; on curve, with y-value the same as the last */ 1820 /* control point's y-value */ 1821 x += args[3]; 1822 cff_builder_add_point( builder, x, y, 1 ); 1823 1824 /* third control point, with y-value the same as the join */ 1825 /* point's y-value */ 1826 x += args[4]; 1827 cff_builder_add_point( builder, x, y, 0 ); 1828 1829 /* fourth control point */ 1830 x += args[5]; 1831 y = start_y; 1832 cff_builder_add_point( builder, x, y, 0 ); 1833 1834 /* ending point, with y-value the same as the start point's */ 1835 /* y-value -- we don't add this point, though */ 1836 x += args[6]; 1837 cff_builder_add_point( builder, x, y, 1 ); 1838 1839 args = stack; 1840 break; 1841 } 1842 1843 case cff_op_flex1: 1844 { 1845 FT_Pos start_x, start_y; /* record start x, y values for */ 1846 /* alter use */ 1847 FT_Fixed dx = 0, dy = 0; /* used in horizontal/vertical */ 1848 /* algorithm below */ 1849 FT_Int horizontal, count; 1850 FT_Fixed* temp; 1851 1852 1853 FT_TRACE4(( " flex1\n" )); 1854 1855 /* adding six more points; 4 control points, 2 on-curve points */ 1856 if ( cff_builder_start_point( builder, x, y ) || 1857 check_points( builder, 6 ) ) 1858 goto Fail; 1859 1860 /* record the starting point's x, y position for later use */ 1861 start_x = x; 1862 start_y = y; 1863 1864 /* XXX: figure out whether this is supposed to be a horizontal */ 1865 /* or vertical flex; the Type 2 specification is vague... */ 1866 1867 temp = args; 1868 1869 /* grab up to the last argument */ 1870 for ( count = 5; count > 0; count-- ) 1871 { 1872 dx += temp[0]; 1873 dy += temp[1]; 1874 temp += 2; 1875 } 1876 1877 if ( dx < 0 ) 1878 dx = -dx; 1879 if ( dy < 0 ) 1880 dy = -dy; 1881 1882 /* strange test, but here it is... */ 1883 horizontal = ( dx > dy ); 1884 1885 for ( count = 5; count > 0; count-- ) 1886 { 1887 x += args[0]; 1888 y += args[1]; 1889 cff_builder_add_point( builder, x, y, 1890 (FT_Bool)( count == 3 ) ); 1891 args += 2; 1892 } 1893 1894 /* is last operand an x- or y-delta? */ 1895 if ( horizontal ) 1896 { 1897 x += args[0]; 1898 y = start_y; 1899 } 1900 else 1901 { 1902 x = start_x; 1903 y += args[0]; 1904 } 1905 1906 cff_builder_add_point( builder, x, y, 1 ); 1907 1908 args = stack; 1909 break; 1910 } 1911 1912 case cff_op_flex: 1913 { 1914 FT_UInt count; 1915 1916 1917 FT_TRACE4(( " flex\n" )); 1918 1919 if ( cff_builder_start_point( builder, x, y ) || 1920 check_points( builder, 6 ) ) 1921 goto Fail; 1922 1923 for ( count = 6; count > 0; count-- ) 1924 { 1925 x += args[0]; 1926 y += args[1]; 1927 cff_builder_add_point( builder, x, y, 1928 (FT_Bool)( count == 4 || count == 1 ) ); 1929 args += 2; 1930 } 1931 1932 args = stack; 1933 } 1934 break; 1935 1936 case cff_op_seac: 1937 FT_TRACE4(( " seac\n" )); 1938 1939 error = cff_operator_seac( decoder, 1940 args[0], args[1], args[2], 1941 (FT_Int)( args[3] >> 16 ), 1942 (FT_Int)( args[4] >> 16 ) ); 1943 1944 /* add current outline to the glyph slot */ 1945 FT_GlyphLoader_Add( builder->loader ); 1946 1947 /* return now! */ 1948 FT_TRACE4(( "\n" )); 1949 return error; 1950 1951 case cff_op_endchar: 1952 FT_TRACE4(( " endchar\n" )); 1953 1954 /* We are going to emulate the seac operator. */ 1955 if ( num_args >= 4 ) 1956 { 1957 /* Save glyph width so that the subglyphs don't overwrite it. */ 1958 FT_Pos glyph_width = decoder->glyph_width; 1959 1960 1961 error = cff_operator_seac( decoder, 1962 0L, args[-4], args[-3], 1963 (FT_Int)( args[-2] >> 16 ), 1964 (FT_Int)( args[-1] >> 16 ) ); 1965 1966 decoder->glyph_width = glyph_width; 1967 } 1968 else 1969 { 1970 if ( !error ) 1971 error = CFF_Err_Ok; 1972 1973 cff_builder_close_contour( builder ); 1974 1975 /* close hints recording session */ 1976 if ( hinter ) 1977 { 1978 if ( hinter->close( hinter->hints, 1979 builder->current->n_points ) ) 1980 goto Syntax_Error; 1981 1982 /* apply hints to the loaded glyph outline now */ 1983 hinter->apply( hinter->hints, 1984 builder->current, 1985 (PSH_Globals)builder->hints_globals, 1986 decoder->hint_mode ); 1987 } 1988 1989 /* add current outline to the glyph slot */ 1990 FT_GlyphLoader_Add( builder->loader ); 1991 } 1992 1993 /* return now! */ 1994 FT_TRACE4(( "\n" )); 1995 return error; 1996 1997 case cff_op_abs: 1998 FT_TRACE4(( " abs\n" )); 1999 2000 if ( args[0] < 0 ) 2001 args[0] = -args[0]; 2002 args++; 2003 break; 2004 2005 case cff_op_add: 2006 FT_TRACE4(( " add\n" )); 2007 2008 args[0] += args[1]; 2009 args++; 2010 break; 2011 2012 case cff_op_sub: 2013 FT_TRACE4(( " sub\n" )); 2014 2015 args[0] -= args[1]; 2016 args++; 2017 break; 2018 2019 case cff_op_div: 2020 FT_TRACE4(( " div\n" )); 2021 2022 args[0] = FT_DivFix( args[0], args[1] ); 2023 args++; 2024 break; 2025 2026 case cff_op_neg: 2027 FT_TRACE4(( " neg\n" )); 2028 2029 args[0] = -args[0]; 2030 args++; 2031 break; 2032 2033 case cff_op_random: 2034 { 2035 FT_Fixed Rand; 2036 2037 2038 FT_TRACE4(( " rand\n" )); 2039 2040 Rand = seed; 2041 if ( Rand >= 0x8000L ) 2042 Rand++; 2043 2044 args[0] = Rand; 2045 seed = FT_MulFix( seed, 0x10000L - seed ); 2046 if ( seed == 0 ) 2047 seed += 0x2873; 2048 args++; 2049 } 2050 break; 2051 2052 case cff_op_mul: 2053 FT_TRACE4(( " mul\n" )); 2054 2055 args[0] = FT_MulFix( args[0], args[1] ); 2056 args++; 2057 break; 2058 2059 case cff_op_sqrt: 2060 FT_TRACE4(( " sqrt\n" )); 2061 2062 if ( args[0] > 0 ) 2063 { 2064 FT_Int count = 9; 2065 FT_Fixed root = args[0]; 2066 FT_Fixed new_root; 2067 2068 2069 for (;;) 2070 { 2071 new_root = ( root + FT_DivFix( args[0], root ) + 1 ) >> 1; 2072 if ( new_root == root || count <= 0 ) 2073 break; 2074 root = new_root; 2075 } 2076 args[0] = new_root; 2077 } 2078 else 2079 args[0] = 0; 2080 args++; 2081 break; 2082 2083 case cff_op_drop: 2084 /* nothing */ 2085 FT_TRACE4(( " drop\n" )); 2086 2087 break; 2088 2089 case cff_op_exch: 2090 { 2091 FT_Fixed tmp; 2092 2093 2094 FT_TRACE4(( " exch\n" )); 2095 2096 tmp = args[0]; 2097 args[0] = args[1]; 2098 args[1] = tmp; 2099 args += 2; 2100 } 2101 break; 2102 2103 case cff_op_index: 2104 { 2105 FT_Int idx = (FT_Int)( args[0] >> 16 ); 2106 2107 2108 FT_TRACE4(( " index\n" )); 2109 2110 if ( idx < 0 ) 2111 idx = 0; 2112 else if ( idx > num_args - 2 ) 2113 idx = num_args - 2; 2114 args[0] = args[-( idx + 1 )]; 2115 args++; 2116 } 2117 break; 2118 2119 case cff_op_roll: 2120 { 2121 FT_Int count = (FT_Int)( args[0] >> 16 ); 2122 FT_Int idx = (FT_Int)( args[1] >> 16 ); 2123 2124 2125 FT_TRACE4(( " roll\n" )); 2126 2127 if ( count <= 0 ) 2128 count = 1; 2129 2130 args -= count; 2131 if ( args < stack ) 2132 goto Stack_Underflow; 2133 2134 if ( idx >= 0 ) 2135 { 2136 while ( idx > 0 ) 2137 { 2138 FT_Fixed tmp = args[count - 1]; 2139 FT_Int i; 2140 2141 2142 for ( i = count - 2; i >= 0; i-- ) 2143 args[i + 1] = args[i]; 2144 args[0] = tmp; 2145 idx--; 2146 } 2147 } 2148 else 2149 { 2150 while ( idx < 0 ) 2151 { 2152 FT_Fixed tmp = args[0]; 2153 FT_Int i; 2154 2155 2156 for ( i = 0; i < count - 1; i++ ) 2157 args[i] = args[i + 1]; 2158 args[count - 1] = tmp; 2159 idx++; 2160 } 2161 } 2162 args += count; 2163 } 2164 break; 2165 2166 case cff_op_dup: 2167 FT_TRACE4(( " dup\n" )); 2168 2169 args[1] = args[0]; 2170 args += 2; 2171 break; 2172 2173 case cff_op_put: 2174 { 2175 FT_Fixed val = args[0]; 2176 FT_Int idx = (FT_Int)( args[1] >> 16 ); 2177 2178 2179 FT_TRACE4(( " put\n" )); 2180 2181 if ( idx >= 0 && idx < CFF_MAX_TRANS_ELEMENTS ) 2182 decoder->buildchar[idx] = val; 2183 } 2184 break; 2185 2186 case cff_op_get: 2187 { 2188 FT_Int idx = (FT_Int)( args[0] >> 16 ); 2189 FT_Fixed val = 0; 2190 2191 2192 FT_TRACE4(( " get\n" )); 2193 2194 if ( idx >= 0 && idx < CFF_MAX_TRANS_ELEMENTS ) 2195 val = decoder->buildchar[idx]; 2196 2197 args[0] = val; 2198 args++; 2199 } 2200 break; 2201 2202 case cff_op_store: 2203 FT_TRACE4(( " store\n")); 2204 2205 goto Unimplemented; 2206 2207 case cff_op_load: 2208 FT_TRACE4(( " load\n" )); 2209 2210 goto Unimplemented; 2211 2212 case cff_op_dotsection: 2213 /* this operator is deprecated and ignored by the parser */ 2214 FT_TRACE4(( " dotsection\n" )); 2215 break; 2216 2217 case cff_op_closepath: 2218 /* this is an invalid Type 2 operator; however, there */ 2219 /* exist fonts which are incorrectly converted from probably */ 2220 /* Type 1 to CFF, and some parsers seem to accept it */ 2221 2222 FT_TRACE4(( " closepath (invalid op)\n" )); 2223 2224 args = stack; 2225 break; 2226 2227 case cff_op_hsbw: 2228 /* this is an invalid Type 2 operator; however, there */ 2229 /* exist fonts which are incorrectly converted from probably */ 2230 /* Type 1 to CFF, and some parsers seem to accept it */ 2231 2232 FT_TRACE4(( " hsbw (invalid op)\n" )); 2233 2234 decoder->glyph_width = decoder->nominal_width + ( args[1] >> 16 ); 2235 2236 decoder->builder.left_bearing.x = args[0]; 2237 decoder->builder.left_bearing.y = 0; 2238 2239 x = decoder->builder.pos_x + args[0]; 2240 y = decoder->builder.pos_y; 2241 args = stack; 2242 break; 2243 2244 case cff_op_sbw: 2245 /* this is an invalid Type 2 operator; however, there */ 2246 /* exist fonts which are incorrectly converted from probably */ 2247 /* Type 1 to CFF, and some parsers seem to accept it */ 2248 2249 FT_TRACE4(( " sbw (invalid op)\n" )); 2250 2251 decoder->glyph_width = decoder->nominal_width + ( args[2] >> 16 ); 2252 2253 decoder->builder.left_bearing.x = args[0]; 2254 decoder->builder.left_bearing.y = args[1]; 2255 2256 x = decoder->builder.pos_x + args[0]; 2257 y = decoder->builder.pos_y + args[1]; 2258 args = stack; 2259 break; 2260 2261 case cff_op_setcurrentpoint: 2262 /* this is an invalid Type 2 operator; however, there */ 2263 /* exist fonts which are incorrectly converted from probably */ 2264 /* Type 1 to CFF, and some parsers seem to accept it */ 2265 2266 FT_TRACE4(( " setcurrentpoint (invalid op)\n" )); 2267 2268 x = decoder->builder.pos_x + args[0]; 2269 y = decoder->builder.pos_y + args[1]; 2270 args = stack; 2271 break; 2272 2273 case cff_op_callothersubr: 2274 /* this is an invalid Type 2 operator; however, there */ 2275 /* exist fonts which are incorrectly converted from probably */ 2276 /* Type 1 to CFF, and some parsers seem to accept it */ 2277 2278 FT_TRACE4(( " callothersubr (invalid op)\n" )); 2279 2280 /* subsequent `pop' operands should add the arguments, */ 2281 /* this is the implementation described for `unknown' other */ 2282 /* subroutines in the Type1 spec. */ 2283 /* */ 2284 /* XXX Fix return arguments (see discussion below). */ 2285 args -= 2 + ( args[-2] >> 16 ); 2286 if ( args < stack ) 2287 goto Stack_Underflow; 2288 break; 2289 2290 case cff_op_pop: 2291 /* this is an invalid Type 2 operator; however, there */ 2292 /* exist fonts which are incorrectly converted from probably */ 2293 /* Type 1 to CFF, and some parsers seem to accept it */ 2294 2295 FT_TRACE4(( " pop (invalid op)\n" )); 2296 2297 /* XXX Increasing `args' is wrong: After a certain number of */ 2298 /* `pop's we get a stack overflow. Reason for doing it is */ 2299 /* code like this (actually found in a CFF font): */ 2300 /* */ 2301 /* 17 1 3 callothersubr */ 2302 /* pop */ 2303 /* callsubr */ 2304 /* */ 2305 /* Since we handle `callothersubr' as a no-op, and */ 2306 /* `callsubr' needs at least one argument, `pop' can't be a */ 2307 /* no-op too as it basically should be. */ 2308 /* */ 2309 /* The right solution would be to provide real support for */ 2310 /* `callothersubr' as done in `t1decode.c', however, given */ 2311 /* the fact that CFF fonts with `pop' are invalid, it is */ 2312 /* questionable whether it is worth the time. */ 2313 args++; 2314 break; 2315 2316 case cff_op_and: 2317 { 2318 FT_Fixed cond = args[0] && args[1]; 2319 2320 2321 FT_TRACE4(( " and\n" )); 2322 2323 args[0] = cond ? 0x10000L : 0; 2324 args++; 2325 } 2326 break; 2327 2328 case cff_op_or: 2329 { 2330 FT_Fixed cond = args[0] || args[1]; 2331 2332 2333 FT_TRACE4(( " or\n" )); 2334 2335 args[0] = cond ? 0x10000L : 0; 2336 args++; 2337 } 2338 break; 2339 2340 case cff_op_eq: 2341 { 2342 FT_Fixed cond = !args[0]; 2343 2344 2345 FT_TRACE4(( " eq\n" )); 2346 2347 args[0] = cond ? 0x10000L : 0; 2348 args++; 2349 } 2350 break; 2351 2352 case cff_op_ifelse: 2353 { 2354 FT_Fixed cond = ( args[2] <= args[3] ); 2355 2356 2357 FT_TRACE4(( " ifelse\n" )); 2358 2359 if ( !cond ) 2360 args[0] = args[1]; 2361 args++; 2362 } 2363 break; 2364 2365 case cff_op_callsubr: 2366 { 2367 FT_UInt idx = (FT_UInt)( ( args[0] >> 16 ) + 2368 decoder->locals_bias ); 2369 2370 2371 FT_TRACE4(( " callsubr(%d)\n", idx )); 2372 2373 if ( idx >= decoder->num_locals ) 2374 { 2375 FT_ERROR(( "cff_decoder_parse_charstrings:" 2376 " invalid local subr index\n" )); 2377 goto Syntax_Error; 2378 } 2379 2380 if ( zone - decoder->zones >= CFF_MAX_SUBRS_CALLS ) 2381 { 2382 FT_ERROR(( "cff_decoder_parse_charstrings:" 2383 " too many nested subrs\n" )); 2384 goto Syntax_Error; 2385 } 2386 2387 zone->cursor = ip; /* save current instruction pointer */ 2388 2389 zone++; 2390 zone->base = decoder->locals[idx]; 2391 zone->limit = decoder->locals[idx + 1]; 2392 zone->cursor = zone->base; 2393 2394 if ( !zone->base || zone->limit == zone->base ) 2395 { 2396 FT_ERROR(( "cff_decoder_parse_charstrings:" 2397 " invoking empty subrs\n" )); 2398 goto Syntax_Error; 2399 } 2400 2401 decoder->zone = zone; 2402 ip = zone->base; 2403 limit = zone->limit; 2404 } 2405 break; 2406 2407 case cff_op_callgsubr: 2408 { 2409 FT_UInt idx = (FT_UInt)( ( args[0] >> 16 ) + 2410 decoder->globals_bias ); 2411 2412 2413 FT_TRACE4(( " callgsubr(%d)\n", idx )); 2414 2415 if ( idx >= decoder->num_globals ) 2416 { 2417 FT_ERROR(( "cff_decoder_parse_charstrings:" 2418 " invalid global subr index\n" )); 2419 goto Syntax_Error; 2420 } 2421 2422 if ( zone - decoder->zones >= CFF_MAX_SUBRS_CALLS ) 2423 { 2424 FT_ERROR(( "cff_decoder_parse_charstrings:" 2425 " too many nested subrs\n" )); 2426 goto Syntax_Error; 2427 } 2428 2429 zone->cursor = ip; /* save current instruction pointer */ 2430 2431 zone++; 2432 zone->base = decoder->globals[idx]; 2433 zone->limit = decoder->globals[idx + 1]; 2434 zone->cursor = zone->base; 2435 2436 if ( !zone->base || zone->limit == zone->base ) 2437 { 2438 FT_ERROR(( "cff_decoder_parse_charstrings:" 2439 " invoking empty subrs\n" )); 2440 goto Syntax_Error; 2441 } 2442 2443 decoder->zone = zone; 2444 ip = zone->base; 2445 limit = zone->limit; 2446 } 2447 break; 2448 2449 case cff_op_return: 2450 FT_TRACE4(( " return\n" )); 2451 2452 if ( decoder->zone <= decoder->zones ) 2453 { 2454 FT_ERROR(( "cff_decoder_parse_charstrings:" 2455 " unexpected return\n" )); 2456 goto Syntax_Error; 2457 } 2458 2459 decoder->zone--; 2460 zone = decoder->zone; 2461 ip = zone->cursor; 2462 limit = zone->limit; 2463 break; 2464 2465 default: 2466 Unimplemented: 2467 FT_ERROR(( "Unimplemented opcode: %d", ip[-1] )); 2468 2469 if ( ip[-1] == 12 ) 2470 FT_ERROR(( " %d", ip[0] )); 2471 FT_ERROR(( "\n" )); 2472 2473 return CFF_Err_Unimplemented_Feature; 2474 } 2475 2476 decoder->top = args; 2477 2478 if ( decoder->top - stack >= CFF_MAX_OPERANDS ) 2479 goto Stack_Overflow; 2480 2481 } /* general operator processing */ 2482 2483 } /* while ip < limit */ 2484 2485 FT_TRACE4(( "..end..\n\n" )); 2486 2487 Fail: 2488 return error; 2489 2490 Syntax_Error: 2491 FT_TRACE4(( "cff_decoder_parse_charstrings: syntax error\n" )); 2492 return CFF_Err_Invalid_File_Format; 2493 2494 Stack_Underflow: 2495 FT_TRACE4(( "cff_decoder_parse_charstrings: stack underflow\n" )); 2496 return CFF_Err_Too_Few_Arguments; 2497 2498 Stack_Overflow: 2499 FT_TRACE4(( "cff_decoder_parse_charstrings: stack overflow\n" )); 2500 return CFF_Err_Stack_Overflow; 2501 } 2502 2503 2504 /*************************************************************************/ 2505 /*************************************************************************/ 2506 /*************************************************************************/ 2507 /********** *********/ 2508 /********** *********/ 2509 /********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/ 2510 /********** *********/ 2511 /********** The following code is in charge of computing *********/ 2512 /********** the maximum advance width of the font. It *********/ 2513 /********** quickly processes each glyph charstring to *********/ 2514 /********** extract the value from either a `sbw' or `seac' *********/ 2515 /********** operator. *********/ 2516 /********** *********/ 2517 /*************************************************************************/ 2518 /*************************************************************************/ 2519 /*************************************************************************/ 2520 2521 2522 #if 0 /* unused until we support pure CFF fonts */ 2523 2524 2525 FT_LOCAL_DEF( FT_Error ) 2526 cff_compute_max_advance( TT_Face face, 2527 FT_Int* max_advance ) 2528 { 2529 FT_Error error = CFF_Err_Ok; 2530 CFF_Decoder decoder; 2531 FT_Int glyph_index; 2532 CFF_Font cff = (CFF_Font)face->other; 2533 2534 2535 *max_advance = 0; 2536 2537 /* Initialize load decoder */ 2538 cff_decoder_init( &decoder, face, 0, 0, 0, 0 ); 2539 2540 decoder.builder.metrics_only = 1; 2541 decoder.builder.load_points = 0; 2542 2543 /* For each glyph, parse the glyph charstring and extract */ 2544 /* the advance width. */ 2545 for ( glyph_index = 0; glyph_index < face->root.num_glyphs; 2546 glyph_index++ ) 2547 { 2548 FT_Byte* charstring; 2549 FT_ULong charstring_len; 2550 2551 2552 /* now get load the unscaled outline */ 2553 error = cff_get_glyph_data( face, glyph_index, 2554 &charstring, &charstring_len ); 2555 if ( !error ) 2556 { 2557 error = cff_decoder_prepare( &decoder, size, glyph_index ); 2558 if ( !error ) 2559 error = cff_decoder_parse_charstrings( &decoder, 2560 charstring, 2561 charstring_len ); 2562 2563 cff_free_glyph_data( face, &charstring, &charstring_len ); 2564 } 2565 2566 /* ignore the error if one has occurred -- skip to next glyph */ 2567 error = CFF_Err_Ok; 2568 } 2569 2570 *max_advance = decoder.builder.advance.x; 2571 2572 return CFF_Err_Ok; 2573 } 2574 2575 2576 #endif /* 0 */ 2577 2578 2579 FT_LOCAL_DEF( FT_Error ) 2580 cff_slot_load( CFF_GlyphSlot glyph, 2581 CFF_Size size, 2582 FT_UInt glyph_index, 2583 FT_Int32 load_flags ) 2584 { 2585 FT_Error error; 2586 CFF_Decoder decoder; 2587 TT_Face face = (TT_Face)glyph->root.face; 2588 FT_Bool hinting, force_scaling; 2589 CFF_Font cff = (CFF_Font)face->extra.data; 2590 2591 FT_Matrix font_matrix; 2592 FT_Vector font_offset; 2593 2594 2595 force_scaling = FALSE; 2596 2597 /* in a CID-keyed font, consider `glyph_index' as a CID and map */ 2598 /* it immediately to the real glyph_index -- if it isn't a */ 2599 /* subsetted font, glyph_indices and CIDs are identical, though */ 2600 if ( cff->top_font.font_dict.cid_registry != 0xFFFFU && 2601 cff->charset.cids ) 2602 { 2603 /* don't handle CID 0 (.notdef) which is directly mapped to GID 0 */ 2604 if ( glyph_index != 0 ) 2605 { 2606 glyph_index = cff_charset_cid_to_gindex( &cff->charset, 2607 glyph_index ); 2608 if ( glyph_index == 0 ) 2609 return CFF_Err_Invalid_Argument; 2610 } 2611 } 2612 else if ( glyph_index >= cff->num_glyphs ) 2613 return CFF_Err_Invalid_Argument; 2614 2615 if ( load_flags & FT_LOAD_NO_RECURSE ) 2616 load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; 2617 2618 glyph->x_scale = 0x10000L; 2619 glyph->y_scale = 0x10000L; 2620 if ( size ) 2621 { 2622 glyph->x_scale = size->root.metrics.x_scale; 2623 glyph->y_scale = size->root.metrics.y_scale; 2624 } 2625 2626 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 2627 2628 /* try to load embedded bitmap if any */ 2629 /* */ 2630 /* XXX: The convention should be emphasized in */ 2631 /* the documents because it can be confusing. */ 2632 if ( size ) 2633 { 2634 CFF_Face cff_face = (CFF_Face)size->root.face; 2635 SFNT_Service sfnt = (SFNT_Service)cff_face->sfnt; 2636 FT_Stream stream = cff_face->root.stream; 2637 2638 2639 if ( size->strike_index != 0xFFFFFFFFUL && 2640 sfnt->load_eblc && 2641 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 2642 { 2643 TT_SBit_MetricsRec metrics; 2644 2645 2646 error = sfnt->load_sbit_image( face, 2647 size->strike_index, 2648 glyph_index, 2649 (FT_Int)load_flags, 2650 stream, 2651 &glyph->root.bitmap, 2652 &metrics ); 2653 2654 if ( !error ) 2655 { 2656 glyph->root.outline.n_points = 0; 2657 glyph->root.outline.n_contours = 0; 2658 2659 glyph->root.metrics.width = (FT_Pos)metrics.width << 6; 2660 glyph->root.metrics.height = (FT_Pos)metrics.height << 6; 2661 2662 glyph->root.metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 2663 glyph->root.metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 2664 glyph->root.metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 2665 2666 glyph->root.metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 2667 glyph->root.metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 2668 glyph->root.metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 2669 2670 glyph->root.format = FT_GLYPH_FORMAT_BITMAP; 2671 2672 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 2673 { 2674 glyph->root.bitmap_left = metrics.vertBearingX; 2675 glyph->root.bitmap_top = metrics.vertBearingY; 2676 } 2677 else 2678 { 2679 glyph->root.bitmap_left = metrics.horiBearingX; 2680 glyph->root.bitmap_top = metrics.horiBearingY; 2681 } 2682 return error; 2683 } 2684 } 2685 } 2686 2687 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 2688 2689 /* return immediately if we only want the embedded bitmaps */ 2690 if ( load_flags & FT_LOAD_SBITS_ONLY ) 2691 return CFF_Err_Invalid_Argument; 2692 2693 /* if we have a CID subfont, use its matrix (which has already */ 2694 /* been multiplied with the root matrix) */ 2695 2696 /* this scaling is only relevant if the PS hinter isn't active */ 2697 if ( cff->num_subfonts ) 2698 { 2699 FT_ULong top_upm, sub_upm; 2700 FT_Byte fd_index = cff_fd_select_get( &cff->fd_select, 2701 glyph_index ); 2702 2703 if ( fd_index >= cff->num_subfonts ) 2704 fd_index = (FT_Byte)( cff->num_subfonts - 1 ); 2705 2706 top_upm = cff->top_font.font_dict.units_per_em; 2707 sub_upm = cff->subfonts[fd_index]->font_dict.units_per_em; 2708 2709 2710 font_matrix = cff->subfonts[fd_index]->font_dict.font_matrix; 2711 font_offset = cff->subfonts[fd_index]->font_dict.font_offset; 2712 2713 if ( top_upm != sub_upm ) 2714 { 2715 glyph->x_scale = FT_MulDiv( glyph->x_scale, top_upm, sub_upm ); 2716 glyph->y_scale = FT_MulDiv( glyph->y_scale, top_upm, sub_upm ); 2717 2718 force_scaling = TRUE; 2719 } 2720 } 2721 else 2722 { 2723 font_matrix = cff->top_font.font_dict.font_matrix; 2724 font_offset = cff->top_font.font_dict.font_offset; 2725 } 2726 2727 glyph->root.outline.n_points = 0; 2728 glyph->root.outline.n_contours = 0; 2729 2730 hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 && 2731 ( load_flags & FT_LOAD_NO_HINTING ) == 0 ); 2732 2733 glyph->root.format = FT_GLYPH_FORMAT_OUTLINE; /* by default */ 2734 2735 { 2736 FT_Byte* charstring; 2737 FT_ULong charstring_len; 2738 2739 2740 cff_decoder_init( &decoder, face, size, glyph, hinting, 2741 FT_LOAD_TARGET_MODE( load_flags ) ); 2742 2743 if ( load_flags & FT_LOAD_ADVANCE_ONLY ) 2744 decoder.width_only = TRUE; 2745 2746 decoder.builder.no_recurse = 2747 (FT_Bool)( load_flags & FT_LOAD_NO_RECURSE ); 2748 2749 /* now load the unscaled outline */ 2750 error = cff_get_glyph_data( face, glyph_index, 2751 &charstring, &charstring_len ); 2752 if ( error ) 2753 goto Glyph_Build_Finished; 2754 2755 error = cff_decoder_prepare( &decoder, size, glyph_index ); 2756 if ( error ) 2757 goto Glyph_Build_Finished; 2758 2759 error = cff_decoder_parse_charstrings( &decoder, 2760 charstring, 2761 charstring_len ); 2762 2763 cff_free_glyph_data( face, &charstring, charstring_len ); 2764 2765 if ( error ) 2766 goto Glyph_Build_Finished; 2767 2768 #ifdef FT_CONFIG_OPTION_INCREMENTAL 2769 /* Control data and length may not be available for incremental */ 2770 /* fonts. */ 2771 if ( face->root.internal->incremental_interface ) 2772 { 2773 glyph->root.control_data = 0; 2774 glyph->root.control_len = 0; 2775 } 2776 else 2777 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 2778 2779 /* We set control_data and control_len if charstrings is loaded. */ 2780 /* See how charstring loads at cff_index_access_element() in */ 2781 /* cffload.c. */ 2782 { 2783 CFF_Index csindex = &cff->charstrings_index; 2784 2785 2786 if ( csindex->offsets ) 2787 { 2788 glyph->root.control_data = csindex->bytes + 2789 csindex->offsets[glyph_index] - 1; 2790 glyph->root.control_len = charstring_len; 2791 } 2792 } 2793 2794 Glyph_Build_Finished: 2795 /* save new glyph tables, if no error */ 2796 if ( !error ) 2797 cff_builder_done( &decoder.builder ); 2798 /* XXX: anything to do for broken glyph entry? */ 2799 } 2800 2801 #ifdef FT_CONFIG_OPTION_INCREMENTAL 2802 2803 /* Incremental fonts can optionally override the metrics. */ 2804 if ( !error && 2805 face->root.internal->incremental_interface && 2806 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 2807 { 2808 FT_Incremental_MetricsRec metrics; 2809 2810 2811 metrics.bearing_x = decoder.builder.left_bearing.x; 2812 metrics.bearing_y = 0; 2813 metrics.advance = decoder.builder.advance.x; 2814 metrics.advance_v = decoder.builder.advance.y; 2815 2816 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 2817 face->root.internal->incremental_interface->object, 2818 glyph_index, FALSE, &metrics ); 2819 2820 decoder.builder.left_bearing.x = metrics.bearing_x; 2821 decoder.builder.advance.x = metrics.advance; 2822 decoder.builder.advance.y = metrics.advance_v; 2823 } 2824 2825 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 2826 2827 if ( !error ) 2828 { 2829 /* Now, set the metrics -- this is rather simple, as */ 2830 /* the left side bearing is the xMin, and the top side */ 2831 /* bearing the yMax. */ 2832 2833 /* For composite glyphs, return only left side bearing and */ 2834 /* advance width. */ 2835 if ( load_flags & FT_LOAD_NO_RECURSE ) 2836 { 2837 FT_Slot_Internal internal = glyph->root.internal; 2838 2839 2840 glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x; 2841 glyph->root.metrics.horiAdvance = decoder.glyph_width; 2842 internal->glyph_matrix = font_matrix; 2843 internal->glyph_delta = font_offset; 2844 internal->glyph_transformed = 1; 2845 } 2846 else 2847 { 2848 FT_BBox cbox; 2849 FT_Glyph_Metrics* metrics = &glyph->root.metrics; 2850 FT_Vector advance; 2851 FT_Bool has_vertical_info; 2852 2853 2854 /* copy the _unscaled_ advance width */ 2855 metrics->horiAdvance = decoder.glyph_width; 2856 glyph->root.linearHoriAdvance = decoder.glyph_width; 2857 glyph->root.internal->glyph_transformed = 0; 2858 2859 #ifdef FT_CONFIG_OPTION_OLD_INTERNALS 2860 has_vertical_info = FT_BOOL( face->vertical_info && 2861 face->vertical.number_Of_VMetrics > 0 && 2862 face->vertical.long_metrics ); 2863 #else 2864 has_vertical_info = FT_BOOL( face->vertical_info && 2865 face->vertical.number_Of_VMetrics > 0 ); 2866 #endif 2867 2868 /* get the vertical metrics from the vtmx table if we have one */ 2869 if ( has_vertical_info ) 2870 { 2871 FT_Short vertBearingY = 0; 2872 FT_UShort vertAdvance = 0; 2873 2874 2875 ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, 2876 glyph_index, 2877 &vertBearingY, 2878 &vertAdvance ); 2879 metrics->vertBearingY = vertBearingY; 2880 metrics->vertAdvance = vertAdvance; 2881 } 2882 else 2883 { 2884 /* make up vertical ones */ 2885 if ( face->os2.version != 0xFFFFU ) 2886 metrics->vertAdvance = (FT_Pos)( face->os2.sTypoAscender - 2887 face->os2.sTypoDescender ); 2888 else 2889 metrics->vertAdvance = (FT_Pos)( face->horizontal.Ascender - 2890 face->horizontal.Descender ); 2891 } 2892 2893 glyph->root.linearVertAdvance = metrics->vertAdvance; 2894 2895 glyph->root.format = FT_GLYPH_FORMAT_OUTLINE; 2896 2897 glyph->root.outline.flags = 0; 2898 if ( size && size->root.metrics.y_ppem < 24 ) 2899 glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION; 2900 2901 glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL; 2902 2903 if ( !( font_matrix.xx == 0x10000L && 2904 font_matrix.yy == 0x10000L && 2905 font_matrix.xy == 0 && 2906 font_matrix.yx == 0 ) ) 2907 FT_Outline_Transform( &glyph->root.outline, &font_matrix ); 2908 2909 if ( !( font_offset.x == 0 && 2910 font_offset.y == 0 ) ) 2911 FT_Outline_Translate( &glyph->root.outline, 2912 font_offset.x, font_offset.y ); 2913 2914 advance.x = metrics->horiAdvance; 2915 advance.y = 0; 2916 FT_Vector_Transform( &advance, &font_matrix ); 2917 metrics->horiAdvance = advance.x + font_offset.x; 2918 2919 advance.x = 0; 2920 advance.y = metrics->vertAdvance; 2921 FT_Vector_Transform( &advance, &font_matrix ); 2922 metrics->vertAdvance = advance.y + font_offset.y; 2923 2924 if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 || force_scaling ) 2925 { 2926 /* scale the outline and the metrics */ 2927 FT_Int n; 2928 FT_Outline* cur = &glyph->root.outline; 2929 FT_Vector* vec = cur->points; 2930 FT_Fixed x_scale = glyph->x_scale; 2931 FT_Fixed y_scale = glyph->y_scale; 2932 2933 2934 /* First of all, scale the points */ 2935 if ( !hinting || !decoder.builder.hints_funcs ) 2936 for ( n = cur->n_points; n > 0; n--, vec++ ) 2937 { 2938 vec->x = FT_MulFix( vec->x, x_scale ); 2939 vec->y = FT_MulFix( vec->y, y_scale ); 2940 } 2941 2942 /* Then scale the metrics */ 2943 metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale ); 2944 metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale ); 2945 } 2946 2947 /* compute the other metrics */ 2948 FT_Outline_Get_CBox( &glyph->root.outline, &cbox ); 2949 2950 metrics->width = cbox.xMax - cbox.xMin; 2951 metrics->height = cbox.yMax - cbox.yMin; 2952 2953 metrics->horiBearingX = cbox.xMin; 2954 metrics->horiBearingY = cbox.yMax; 2955 2956 if ( has_vertical_info ) 2957 metrics->vertBearingX = metrics->horiBearingX - 2958 metrics->horiAdvance / 2; 2959 else 2960 { 2961 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 2962 ft_synthesize_vertical_metrics( metrics, 2963 metrics->vertAdvance ); 2964 } 2965 } 2966 } 2967 2968 return error; 2969 } 2970 2971 2972 /* END */ 2973
