1 /***************************************************************************/ 2 /* */ 3 /* cffgload.c */ 4 /* */ 5 /* OpenType Glyph Loader (body). */ 6 /* */ 7 /* Copyright 1996-2013 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 #include FT_CFF_DRIVER_H 25 26 #include "cffobjs.h" 27 #include "cffload.h" 28 #include "cffgload.h" 29 #include "cf2ft.h" /* for cf2_decoder_parse_charstrings */ 30 31 #include "cfferrs.h" 32 33 34 /*************************************************************************/ 35 /* */ 36 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 37 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 38 /* messages during execution. */ 39 /* */ 40 #undef FT_COMPONENT 41 #define FT_COMPONENT trace_cffgload 42 43 44 #ifdef CFF_CONFIG_OPTION_OLD_ENGINE 45 46 typedef enum CFF_Operator_ 47 { 48 cff_op_unknown = 0, 49 50 cff_op_rmoveto, 51 cff_op_hmoveto, 52 cff_op_vmoveto, 53 54 cff_op_rlineto, 55 cff_op_hlineto, 56 cff_op_vlineto, 57 58 cff_op_rrcurveto, 59 cff_op_hhcurveto, 60 cff_op_hvcurveto, 61 cff_op_rcurveline, 62 cff_op_rlinecurve, 63 cff_op_vhcurveto, 64 cff_op_vvcurveto, 65 66 cff_op_flex, 67 cff_op_hflex, 68 cff_op_hflex1, 69 cff_op_flex1, 70 71 cff_op_endchar, 72 73 cff_op_hstem, 74 cff_op_vstem, 75 cff_op_hstemhm, 76 cff_op_vstemhm, 77 78 cff_op_hintmask, 79 cff_op_cntrmask, 80 cff_op_dotsection, /* deprecated, acts as no-op */ 81 82 cff_op_abs, 83 cff_op_add, 84 cff_op_sub, 85 cff_op_div, 86 cff_op_neg, 87 cff_op_random, 88 cff_op_mul, 89 cff_op_sqrt, 90 91 cff_op_blend, 92 93 cff_op_drop, 94 cff_op_exch, 95 cff_op_index, 96 cff_op_roll, 97 cff_op_dup, 98 99 cff_op_put, 100 cff_op_get, 101 cff_op_store, 102 cff_op_load, 103 104 cff_op_and, 105 cff_op_or, 106 cff_op_not, 107 cff_op_eq, 108 cff_op_ifelse, 109 110 cff_op_callsubr, 111 cff_op_callgsubr, 112 cff_op_return, 113 114 /* Type 1 opcodes: invalid but seen in real life */ 115 cff_op_hsbw, 116 cff_op_closepath, 117 cff_op_callothersubr, 118 cff_op_pop, 119 cff_op_seac, 120 cff_op_sbw, 121 cff_op_setcurrentpoint, 122 123 /* do not remove */ 124 cff_op_max 125 126 } CFF_Operator; 127 128 129 #define CFF_COUNT_CHECK_WIDTH 0x80 130 #define CFF_COUNT_EXACT 0x40 131 #define CFF_COUNT_CLEAR_STACK 0x20 132 133 /* count values which have the `CFF_COUNT_CHECK_WIDTH' flag set are */ 134 /* used for checking the width and requested numbers of arguments */ 135 /* only; they are set to zero afterwards */ 136 137 /* the other two flags are informative only and unused currently */ 138 139 static const FT_Byte cff_argument_counts[] = 140 { 141 0, /* unknown */ 142 143 2 | CFF_COUNT_CHECK_WIDTH | CFF_COUNT_EXACT, /* rmoveto */ 144 1 | CFF_COUNT_CHECK_WIDTH | CFF_COUNT_EXACT, 145 1 | CFF_COUNT_CHECK_WIDTH | CFF_COUNT_EXACT, 146 147 0 | CFF_COUNT_CLEAR_STACK, /* rlineto */ 148 0 | CFF_COUNT_CLEAR_STACK, 149 0 | CFF_COUNT_CLEAR_STACK, 150 151 0 | CFF_COUNT_CLEAR_STACK, /* rrcurveto */ 152 0 | CFF_COUNT_CLEAR_STACK, 153 0 | CFF_COUNT_CLEAR_STACK, 154 0 | CFF_COUNT_CLEAR_STACK, 155 0 | CFF_COUNT_CLEAR_STACK, 156 0 | CFF_COUNT_CLEAR_STACK, 157 0 | CFF_COUNT_CLEAR_STACK, 158 159 13, /* flex */ 160 7, 161 9, 162 11, 163 164 0 | CFF_COUNT_CHECK_WIDTH, /* endchar */ 165 166 2 | CFF_COUNT_CHECK_WIDTH, /* hstem */ 167 2 | CFF_COUNT_CHECK_WIDTH, 168 2 | CFF_COUNT_CHECK_WIDTH, 169 2 | CFF_COUNT_CHECK_WIDTH, 170 171 0 | CFF_COUNT_CHECK_WIDTH, /* hintmask */ 172 0 | CFF_COUNT_CHECK_WIDTH, /* cntrmask */ 173 0, /* dotsection */ 174 175 1, /* abs */ 176 2, 177 2, 178 2, 179 1, 180 0, 181 2, 182 1, 183 184 1, /* blend */ 185 186 1, /* drop */ 187 2, 188 1, 189 2, 190 1, 191 192 2, /* put */ 193 1, 194 4, 195 3, 196 197 2, /* and */ 198 2, 199 1, 200 2, 201 4, 202 203 1, /* callsubr */ 204 1, 205 0, 206 207 2, /* hsbw */ 208 0, 209 0, 210 0, 211 5, /* seac */ 212 4, /* sbw */ 213 2 /* setcurrentpoint */ 214 }; 215 216 #endif /* CFF_CONFIG_OPTION_OLD_ENGINE */ 217 218 219 /*************************************************************************/ 220 /*************************************************************************/ 221 /*************************************************************************/ 222 /********** *********/ 223 /********** *********/ 224 /********** GENERIC CHARSTRING PARSING *********/ 225 /********** *********/ 226 /********** *********/ 227 /*************************************************************************/ 228 /*************************************************************************/ 229 /*************************************************************************/ 230 231 232 /*************************************************************************/ 233 /* */ 234 /* <Function> */ 235 /* cff_builder_init */ 236 /* */ 237 /* <Description> */ 238 /* Initializes a given glyph builder. */ 239 /* */ 240 /* <InOut> */ 241 /* builder :: A pointer to the glyph builder to initialize. */ 242 /* */ 243 /* <Input> */ 244 /* face :: The current face object. */ 245 /* */ 246 /* size :: The current size object. */ 247 /* */ 248 /* glyph :: The current glyph object. */ 249 /* */ 250 /* hinting :: Whether hinting is active. */ 251 /* */ 252 static void 253 cff_builder_init( CFF_Builder* builder, 254 TT_Face face, 255 CFF_Size size, 256 CFF_GlyphSlot glyph, 257 FT_Bool hinting ) 258 { 259 builder->path_begun = 0; 260 builder->load_points = 1; 261 262 builder->face = face; 263 builder->glyph = glyph; 264 builder->memory = face->root.memory; 265 266 if ( glyph ) 267 { 268 FT_GlyphLoader loader = glyph->root.internal->loader; 269 270 271 builder->loader = loader; 272 builder->base = &loader->base.outline; 273 builder->current = &loader->current.outline; 274 FT_GlyphLoader_Rewind( loader ); 275 276 builder->hints_globals = 0; 277 builder->hints_funcs = 0; 278 279 if ( hinting && size ) 280 { 281 CFF_Internal internal = (CFF_Internal)size->root.internal; 282 283 284 builder->hints_globals = (void *)internal->topfont; 285 builder->hints_funcs = glyph->root.internal->glyph_hints; 286 } 287 } 288 289 builder->pos_x = 0; 290 builder->pos_y = 0; 291 292 builder->left_bearing.x = 0; 293 builder->left_bearing.y = 0; 294 builder->advance.x = 0; 295 builder->advance.y = 0; 296 } 297 298 299 /*************************************************************************/ 300 /* */ 301 /* <Function> */ 302 /* cff_builder_done */ 303 /* */ 304 /* <Description> */ 305 /* Finalizes a given glyph builder. Its contents can still be used */ 306 /* after the call, but the function saves important information */ 307 /* within the corresponding glyph slot. */ 308 /* */ 309 /* <Input> */ 310 /* builder :: A pointer to the glyph builder to finalize. */ 311 /* */ 312 static void 313 cff_builder_done( CFF_Builder* builder ) 314 { 315 CFF_GlyphSlot glyph = builder->glyph; 316 317 318 if ( glyph ) 319 glyph->root.outline = *builder->base; 320 } 321 322 323 /*************************************************************************/ 324 /* */ 325 /* <Function> */ 326 /* cff_compute_bias */ 327 /* */ 328 /* <Description> */ 329 /* Computes the bias value in dependence of the number of glyph */ 330 /* subroutines. */ 331 /* */ 332 /* <Input> */ 333 /* in_charstring_type :: The `CharstringType' value of the top DICT */ 334 /* dictionary. */ 335 /* */ 336 /* num_subrs :: The number of glyph subroutines. */ 337 /* */ 338 /* <Return> */ 339 /* The bias value. */ 340 static FT_Int 341 cff_compute_bias( FT_Int in_charstring_type, 342 FT_UInt num_subrs ) 343 { 344 FT_Int result; 345 346 347 if ( in_charstring_type == 1 ) 348 result = 0; 349 else if ( num_subrs < 1240 ) 350 result = 107; 351 else if ( num_subrs < 33900U ) 352 result = 1131; 353 else 354 result = 32768U; 355 356 return result; 357 } 358 359 360 /*************************************************************************/ 361 /* */ 362 /* <Function> */ 363 /* cff_decoder_init */ 364 /* */ 365 /* <Description> */ 366 /* Initializes a given glyph decoder. */ 367 /* */ 368 /* <InOut> */ 369 /* decoder :: A pointer to the glyph builder to initialize. */ 370 /* */ 371 /* <Input> */ 372 /* face :: The current face object. */ 373 /* */ 374 /* size :: The current size object. */ 375 /* */ 376 /* slot :: The current glyph object. */ 377 /* */ 378 /* hinting :: Whether hinting is active. */ 379 /* */ 380 /* hint_mode :: The hinting mode. */ 381 /* */ 382 FT_LOCAL_DEF( void ) 383 cff_decoder_init( CFF_Decoder* decoder, 384 TT_Face face, 385 CFF_Size size, 386 CFF_GlyphSlot slot, 387 FT_Bool hinting, 388 FT_Render_Mode hint_mode ) 389 { 390 CFF_Font cff = (CFF_Font)face->extra.data; 391 392 393 /* clear everything */ 394 FT_MEM_ZERO( decoder, sizeof ( *decoder ) ); 395 396 /* initialize builder */ 397 cff_builder_init( &decoder->builder, face, size, slot, hinting ); 398 399 /* initialize Type2 decoder */ 400 decoder->cff = cff; 401 decoder->num_globals = cff->global_subrs_index.count; 402 decoder->globals = cff->global_subrs; 403 decoder->globals_bias = cff_compute_bias( 404 cff->top_font.font_dict.charstring_type, 405 decoder->num_globals ); 406 407 decoder->hint_mode = hint_mode; 408 } 409 410 411 /* this function is used to select the subfont */ 412 /* and the locals subrs array */ 413 FT_LOCAL_DEF( FT_Error ) 414 cff_decoder_prepare( CFF_Decoder* decoder, 415 CFF_Size size, 416 FT_UInt glyph_index ) 417 { 418 CFF_Builder *builder = &decoder->builder; 419 CFF_Font cff = (CFF_Font)builder->face->extra.data; 420 CFF_SubFont sub = &cff->top_font; 421 FT_Error error = FT_Err_Ok; 422 423 424 /* manage CID fonts */ 425 if ( cff->num_subfonts ) 426 { 427 FT_Byte fd_index = cff_fd_select_get( &cff->fd_select, glyph_index ); 428 429 430 if ( fd_index >= cff->num_subfonts ) 431 { 432 FT_TRACE4(( "cff_decoder_prepare: invalid CID subfont index\n" )); 433 error = FT_THROW( Invalid_File_Format ); 434 goto Exit; 435 } 436 437 FT_TRACE3(( "glyph index %d (subfont %d):\n", glyph_index, fd_index )); 438 439 sub = cff->subfonts[fd_index]; 440 441 if ( builder->hints_funcs && size ) 442 { 443 CFF_Internal internal = (CFF_Internal)size->root.internal; 444 445 446 /* for CFFs without subfonts, this value has already been set */ 447 builder->hints_globals = (void *)internal->subfonts[fd_index]; 448 } 449 } 450 #ifdef FT_DEBUG_LEVEL_TRACE 451 else 452 FT_TRACE3(( "glyph index %d:\n", glyph_index )); 453 #endif 454 455 decoder->num_locals = sub->local_subrs_index.count; 456 decoder->locals = sub->local_subrs; 457 decoder->locals_bias = cff_compute_bias( 458 decoder->cff->top_font.font_dict.charstring_type, 459 decoder->num_locals ); 460 461 decoder->glyph_width = sub->private_dict.default_width; 462 decoder->nominal_width = sub->private_dict.nominal_width; 463 464 decoder->current_subfont = sub; /* for Adobe's CFF handler */ 465 466 Exit: 467 return error; 468 } 469 470 471 /* check that there is enough space for `count' more points */ 472 FT_LOCAL_DEF( FT_Error ) 473 cff_check_points( CFF_Builder* builder, 474 FT_Int count ) 475 { 476 return FT_GLYPHLOADER_CHECK_POINTS( builder->loader, count, 0 ); 477 } 478 479 480 /* add a new point, do not check space */ 481 FT_LOCAL_DEF( void ) 482 cff_builder_add_point( CFF_Builder* builder, 483 FT_Pos x, 484 FT_Pos y, 485 FT_Byte flag ) 486 { 487 FT_Outline* outline = builder->current; 488 489 490 if ( builder->load_points ) 491 { 492 FT_Vector* point = outline->points + outline->n_points; 493 FT_Byte* control = (FT_Byte*)outline->tags + outline->n_points; 494 495 #ifdef CFF_CONFIG_OPTION_OLD_ENGINE 496 CFF_Driver driver = (CFF_Driver)FT_FACE_DRIVER( builder->face ); 497 498 499 if ( driver->hinting_engine == FT_CFF_HINTING_FREETYPE ) 500 { 501 point->x = x >> 16; 502 point->y = y >> 16; 503 } 504 else 505 #endif 506 { 507 /* cf2_decoder_parse_charstrings uses 16.16 coordinates */ 508 point->x = x >> 10; 509 point->y = y >> 10; 510 } 511 *control = (FT_Byte)( flag ? FT_CURVE_TAG_ON : FT_CURVE_TAG_CUBIC ); 512 } 513 514 outline->n_points++; 515 } 516 517 518 /* check space for a new on-curve point, then add it */ 519 FT_LOCAL_DEF( FT_Error ) 520 cff_builder_add_point1( CFF_Builder* builder, 521 FT_Pos x, 522 FT_Pos y ) 523 { 524 FT_Error error; 525 526 527 error = cff_check_points( builder, 1 ); 528 if ( !error ) 529 cff_builder_add_point( builder, x, y, 1 ); 530 531 return error; 532 } 533 534 535 /* check space for a new contour, then add it */ 536 static FT_Error 537 cff_builder_add_contour( CFF_Builder* builder ) 538 { 539 FT_Outline* outline = builder->current; 540 FT_Error error; 541 542 543 if ( !builder->load_points ) 544 { 545 outline->n_contours++; 546 return FT_Err_Ok; 547 } 548 549 error = FT_GLYPHLOADER_CHECK_POINTS( builder->loader, 0, 1 ); 550 if ( !error ) 551 { 552 if ( outline->n_contours > 0 ) 553 outline->contours[outline->n_contours - 1] = 554 (short)( outline->n_points - 1 ); 555 556 outline->n_contours++; 557 } 558 559 return error; 560 } 561 562 563 /* if a path was begun, add its first on-curve point */ 564 FT_LOCAL_DEF( FT_Error ) 565 cff_builder_start_point( CFF_Builder* builder, 566 FT_Pos x, 567 FT_Pos y ) 568 { 569 FT_Error error = FT_Err_Ok; 570 571 572 /* test whether we are building a new contour */ 573 if ( !builder->path_begun ) 574 { 575 builder->path_begun = 1; 576 error = cff_builder_add_contour( builder ); 577 if ( !error ) 578 error = cff_builder_add_point1( builder, x, y ); 579 } 580 581 return error; 582 } 583 584 585 /* close the current contour */ 586 FT_LOCAL_DEF( void ) 587 cff_builder_close_contour( CFF_Builder* builder ) 588 { 589 FT_Outline* outline = builder->current; 590 FT_Int first; 591 592 593 if ( !outline ) 594 return; 595 596 first = outline->n_contours <= 1 597 ? 0 : outline->contours[outline->n_contours - 2] + 1; 598 599 /* We must not include the last point in the path if it */ 600 /* is located on the first point. */ 601 if ( outline->n_points > 1 ) 602 { 603 FT_Vector* p1 = outline->points + first; 604 FT_Vector* p2 = outline->points + outline->n_points - 1; 605 FT_Byte* control = (FT_Byte*)outline->tags + outline->n_points - 1; 606 607 608 /* `delete' last point only if it coincides with the first */ 609 /* point and if it is not a control point (which can happen). */ 610 if ( p1->x == p2->x && p1->y == p2->y ) 611 if ( *control == FT_CURVE_TAG_ON ) 612 outline->n_points--; 613 } 614 615 if ( outline->n_contours > 0 ) 616 { 617 /* Don't add contours only consisting of one point, i.e., */ 618 /* check whether begin point and last point are the same. */ 619 if ( first == outline->n_points - 1 ) 620 { 621 outline->n_contours--; 622 outline->n_points--; 623 } 624 else 625 outline->contours[outline->n_contours - 1] = 626 (short)( outline->n_points - 1 ); 627 } 628 } 629 630 631 FT_LOCAL_DEF( FT_Int ) 632 cff_lookup_glyph_by_stdcharcode( CFF_Font cff, 633 FT_Int charcode ) 634 { 635 FT_UInt n; 636 FT_UShort glyph_sid; 637 638 639 /* CID-keyed fonts don't have glyph names */ 640 if ( !cff->charset.sids ) 641 return -1; 642 643 /* check range of standard char code */ 644 if ( charcode < 0 || charcode > 255 ) 645 return -1; 646 647 /* Get code to SID mapping from `cff_standard_encoding'. */ 648 glyph_sid = cff_get_standard_encoding( (FT_UInt)charcode ); 649 650 for ( n = 0; n < cff->num_glyphs; n++ ) 651 { 652 if ( cff->charset.sids[n] == glyph_sid ) 653 return n; 654 } 655 656 return -1; 657 } 658 659 660 FT_LOCAL_DEF( FT_Error ) 661 cff_get_glyph_data( TT_Face face, 662 FT_UInt glyph_index, 663 FT_Byte** pointer, 664 FT_ULong* length ) 665 { 666 #ifdef FT_CONFIG_OPTION_INCREMENTAL 667 /* For incremental fonts get the character data using the */ 668 /* callback function. */ 669 if ( face->root.internal->incremental_interface ) 670 { 671 FT_Data data; 672 FT_Error error = 673 face->root.internal->incremental_interface->funcs->get_glyph_data( 674 face->root.internal->incremental_interface->object, 675 glyph_index, &data ); 676 677 678 *pointer = (FT_Byte*)data.pointer; 679 *length = data.length; 680 681 return error; 682 } 683 else 684 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 685 686 { 687 CFF_Font cff = (CFF_Font)(face->extra.data); 688 689 690 return cff_index_access_element( &cff->charstrings_index, glyph_index, 691 pointer, length ); 692 } 693 } 694 695 696 FT_LOCAL_DEF( void ) 697 cff_free_glyph_data( TT_Face face, 698 FT_Byte** pointer, 699 FT_ULong length ) 700 { 701 #ifndef FT_CONFIG_OPTION_INCREMENTAL 702 FT_UNUSED( length ); 703 #endif 704 705 #ifdef FT_CONFIG_OPTION_INCREMENTAL 706 /* For incremental fonts get the character data using the */ 707 /* callback function. */ 708 if ( face->root.internal->incremental_interface ) 709 { 710 FT_Data data; 711 712 713 data.pointer = *pointer; 714 data.length = length; 715 716 face->root.internal->incremental_interface->funcs->free_glyph_data( 717 face->root.internal->incremental_interface->object, &data ); 718 } 719 else 720 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 721 722 { 723 CFF_Font cff = (CFF_Font)(face->extra.data); 724 725 726 cff_index_forget_element( &cff->charstrings_index, pointer ); 727 } 728 } 729 730 731 #ifdef CFF_CONFIG_OPTION_OLD_ENGINE 732 733 static FT_Error 734 cff_operator_seac( CFF_Decoder* decoder, 735 FT_Pos asb, 736 FT_Pos adx, 737 FT_Pos ady, 738 FT_Int bchar, 739 FT_Int achar ) 740 { 741 FT_Error error; 742 CFF_Builder* builder = &decoder->builder; 743 FT_Int bchar_index, achar_index; 744 TT_Face face = decoder->builder.face; 745 FT_Vector left_bearing, advance; 746 FT_Byte* charstring; 747 FT_ULong charstring_len; 748 FT_Pos glyph_width; 749 750 751 if ( decoder->seac ) 752 { 753 FT_ERROR(( "cff_operator_seac: invalid nested seac\n" )); 754 return FT_THROW( Syntax_Error ); 755 } 756 757 adx += decoder->builder.left_bearing.x; 758 ady += decoder->builder.left_bearing.y; 759 760 #ifdef FT_CONFIG_OPTION_INCREMENTAL 761 /* Incremental fonts don't necessarily have valid charsets. */ 762 /* They use the character code, not the glyph index, in this case. */ 763 if ( face->root.internal->incremental_interface ) 764 { 765 bchar_index = bchar; 766 achar_index = achar; 767 } 768 else 769 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 770 { 771 CFF_Font cff = (CFF_Font)(face->extra.data); 772 773 774 bchar_index = cff_lookup_glyph_by_stdcharcode( cff, bchar ); 775 achar_index = cff_lookup_glyph_by_stdcharcode( cff, achar ); 776 } 777 778 if ( bchar_index < 0 || achar_index < 0 ) 779 { 780 FT_ERROR(( "cff_operator_seac:" 781 " invalid seac character code arguments\n" )); 782 return FT_THROW( Syntax_Error ); 783 } 784 785 /* If we are trying to load a composite glyph, do not load the */ 786 /* accent character and return the array of subglyphs. */ 787 if ( builder->no_recurse ) 788 { 789 FT_GlyphSlot glyph = (FT_GlyphSlot)builder->glyph; 790 FT_GlyphLoader loader = glyph->internal->loader; 791 FT_SubGlyph subg; 792 793 794 /* reallocate subglyph array if necessary */ 795 error = FT_GlyphLoader_CheckSubGlyphs( loader, 2 ); 796 if ( error ) 797 goto Exit; 798 799 subg = loader->current.subglyphs; 800 801 /* subglyph 0 = base character */ 802 subg->index = bchar_index; 803 subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES | 804 FT_SUBGLYPH_FLAG_USE_MY_METRICS; 805 subg->arg1 = 0; 806 subg->arg2 = 0; 807 subg++; 808 809 /* subglyph 1 = accent character */ 810 subg->index = achar_index; 811 subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES; 812 subg->arg1 = (FT_Int)( adx >> 16 ); 813 subg->arg2 = (FT_Int)( ady >> 16 ); 814 815 /* set up remaining glyph fields */ 816 glyph->num_subglyphs = 2; 817 glyph->subglyphs = loader->base.subglyphs; 818 glyph->format = FT_GLYPH_FORMAT_COMPOSITE; 819 820 loader->current.num_subglyphs = 2; 821 } 822 823 FT_GlyphLoader_Prepare( builder->loader ); 824 825 /* First load `bchar' in builder */ 826 error = cff_get_glyph_data( face, bchar_index, 827 &charstring, &charstring_len ); 828 if ( !error ) 829 { 830 /* the seac operator must not be nested */ 831 decoder->seac = TRUE; 832 error = cff_decoder_parse_charstrings( decoder, charstring, 833 charstring_len ); 834 decoder->seac = FALSE; 835 836 cff_free_glyph_data( face, &charstring, charstring_len ); 837 838 if ( error ) 839 goto Exit; 840 } 841 842 /* Save the left bearing, advance and glyph width of the base */ 843 /* character as they will be erased by the next load. */ 844 845 left_bearing = builder->left_bearing; 846 advance = builder->advance; 847 glyph_width = decoder->glyph_width; 848 849 builder->left_bearing.x = 0; 850 builder->left_bearing.y = 0; 851 852 builder->pos_x = adx - asb; 853 builder->pos_y = ady; 854 855 /* Now load `achar' on top of the base outline. */ 856 error = cff_get_glyph_data( face, achar_index, 857 &charstring, &charstring_len ); 858 if ( !error ) 859 { 860 /* the seac operator must not be nested */ 861 decoder->seac = TRUE; 862 error = cff_decoder_parse_charstrings( decoder, charstring, 863 charstring_len ); 864 decoder->seac = FALSE; 865 866 cff_free_glyph_data( face, &charstring, charstring_len ); 867 868 if ( error ) 869 goto Exit; 870 } 871 872 /* Restore the left side bearing, advance and glyph width */ 873 /* of the base character. */ 874 builder->left_bearing = left_bearing; 875 builder->advance = advance; 876 decoder->glyph_width = glyph_width; 877 878 builder->pos_x = 0; 879 builder->pos_y = 0; 880 881 Exit: 882 return error; 883 } 884 885 886 /*************************************************************************/ 887 /* */ 888 /* <Function> */ 889 /* cff_decoder_parse_charstrings */ 890 /* */ 891 /* <Description> */ 892 /* Parses a given Type 2 charstrings program. */ 893 /* */ 894 /* <InOut> */ 895 /* decoder :: The current Type 1 decoder. */ 896 /* */ 897 /* <Input> */ 898 /* charstring_base :: The base of the charstring stream. */ 899 /* */ 900 /* charstring_len :: The length in bytes of the charstring stream. */ 901 /* */ 902 /* <Return> */ 903 /* FreeType error code. 0 means success. */ 904 /* */ 905 FT_LOCAL_DEF( FT_Error ) 906 cff_decoder_parse_charstrings( CFF_Decoder* decoder, 907 FT_Byte* charstring_base, 908 FT_ULong charstring_len ) 909 { 910 FT_Error error; 911 CFF_Decoder_Zone* zone; 912 FT_Byte* ip; 913 FT_Byte* limit; 914 CFF_Builder* builder = &decoder->builder; 915 FT_Pos x, y; 916 FT_Fixed seed; 917 FT_Fixed* stack; 918 FT_Int charstring_type = 919 decoder->cff->top_font.font_dict.charstring_type; 920 921 T2_Hints_Funcs hinter; 922 923 924 /* set default width */ 925 decoder->num_hints = 0; 926 decoder->read_width = 1; 927 928 /* compute random seed from stack address of parameter */ 929 seed = (FT_Fixed)( ( (FT_PtrDist)(char*)&seed ^ 930 (FT_PtrDist)(char*)&decoder ^ 931 (FT_PtrDist)(char*)&charstring_base ) & 932 FT_ULONG_MAX ) ; 933 seed = ( seed ^ ( seed >> 10 ) ^ ( seed >> 20 ) ) & 0xFFFFL; 934 if ( seed == 0 ) 935 seed = 0x7384; 936 937 /* initialize the decoder */ 938 decoder->top = decoder->stack; 939 decoder->zone = decoder->zones; 940 zone = decoder->zones; 941 stack = decoder->top; 942 943 hinter = (T2_Hints_Funcs)builder->hints_funcs; 944 945 builder->path_begun = 0; 946 947 zone->base = charstring_base; 948 limit = zone->limit = charstring_base + charstring_len; 949 ip = zone->cursor = zone->base; 950 951 error = FT_Err_Ok; 952 953 x = builder->pos_x; 954 y = builder->pos_y; 955 956 /* begin hints recording session, if any */ 957 if ( hinter ) 958 hinter->open( hinter->hints ); 959 960 /* now execute loop */ 961 while ( ip < limit ) 962 { 963 CFF_Operator op; 964 FT_Byte v; 965 966 967 /********************************************************************/ 968 /* */ 969 /* Decode operator or operand */ 970 /* */ 971 v = *ip++; 972 if ( v >= 32 || v == 28 ) 973 { 974 FT_Int shift = 16; 975 FT_Int32 val; 976 977 978 /* this is an operand, push it on the stack */ 979 980 /* if we use shifts, all computations are done with unsigned */ 981 /* values; the conversion to a signed value is the last step */ 982 if ( v == 28 ) 983 { 984 if ( ip + 1 >= limit ) 985 goto Syntax_Error; 986 val = (FT_Short)( ( (FT_UShort)ip[0] << 8 ) | ip[1] ); 987 ip += 2; 988 } 989 else if ( v < 247 ) 990 val = (FT_Int32)v - 139; 991 else if ( v < 251 ) 992 { 993 if ( ip >= limit ) 994 goto Syntax_Error; 995 val = ( (FT_Int32)v - 247 ) * 256 + *ip++ + 108; 996 } 997 else if ( v < 255 ) 998 { 999 if ( ip >= limit ) 1000 goto Syntax_Error; 1001 val = -( (FT_Int32)v - 251 ) * 256 - *ip++ - 108; 1002 } 1003 else 1004 { 1005 if ( ip + 3 >= limit ) 1006 goto Syntax_Error; 1007 val = (FT_Int32)( ( (FT_UInt32)ip[0] << 24 ) | 1008 ( (FT_UInt32)ip[1] << 16 ) | 1009 ( (FT_UInt32)ip[2] << 8 ) | 1010 (FT_UInt32)ip[3] ); 1011 ip += 4; 1012 if ( charstring_type == 2 ) 1013 shift = 0; 1014 } 1015 if ( decoder->top - stack >= CFF_MAX_OPERANDS ) 1016 goto Stack_Overflow; 1017 1018 val = (FT_Int32)( (FT_UInt32)val << shift ); 1019 *decoder->top++ = val; 1020 1021 #ifdef FT_DEBUG_LEVEL_TRACE 1022 if ( !( val & 0xFFFFL ) ) 1023 FT_TRACE4(( " %hd", (FT_Short)( (FT_UInt32)val >> 16 ) )); 1024 else 1025 FT_TRACE4(( " %.2f", val / 65536.0 )); 1026 #endif 1027 1028 } 1029 else 1030 { 1031 /* The specification says that normally arguments are to be taken */ 1032 /* from the bottom of the stack. However, this seems not to be */ 1033 /* correct, at least for Acroread 7.0.8 on GNU/Linux: It pops the */ 1034 /* arguments similar to a PS interpreter. */ 1035 1036 FT_Fixed* args = decoder->top; 1037 FT_Int num_args = (FT_Int)( args - decoder->stack ); 1038 FT_Int req_args; 1039 1040 1041 /* find operator */ 1042 op = cff_op_unknown; 1043 1044 switch ( v ) 1045 { 1046 case 1: 1047 op = cff_op_hstem; 1048 break; 1049 case 3: 1050 op = cff_op_vstem; 1051 break; 1052 case 4: 1053 op = cff_op_vmoveto; 1054 break; 1055 case 5: 1056 op = cff_op_rlineto; 1057 break; 1058 case 6: 1059 op = cff_op_hlineto; 1060 break; 1061 case 7: 1062 op = cff_op_vlineto; 1063 break; 1064 case 8: 1065 op = cff_op_rrcurveto; 1066 break; 1067 case 9: 1068 op = cff_op_closepath; 1069 break; 1070 case 10: 1071 op = cff_op_callsubr; 1072 break; 1073 case 11: 1074 op = cff_op_return; 1075 break; 1076 case 12: 1077 { 1078 if ( ip >= limit ) 1079 goto Syntax_Error; 1080 v = *ip++; 1081 1082 switch ( v ) 1083 { 1084 case 0: 1085 op = cff_op_dotsection; 1086 break; 1087 case 1: /* this is actually the Type1 vstem3 operator */ 1088 op = cff_op_vstem; 1089 break; 1090 case 2: /* this is actually the Type1 hstem3 operator */ 1091 op = cff_op_hstem; 1092 break; 1093 case 3: 1094 op = cff_op_and; 1095 break; 1096 case 4: 1097 op = cff_op_or; 1098 break; 1099 case 5: 1100 op = cff_op_not; 1101 break; 1102 case 6: 1103 op = cff_op_seac; 1104 break; 1105 case 7: 1106 op = cff_op_sbw; 1107 break; 1108 case 8: 1109 op = cff_op_store; 1110 break; 1111 case 9: 1112 op = cff_op_abs; 1113 break; 1114 case 10: 1115 op = cff_op_add; 1116 break; 1117 case 11: 1118 op = cff_op_sub; 1119 break; 1120 case 12: 1121 op = cff_op_div; 1122 break; 1123 case 13: 1124 op = cff_op_load; 1125 break; 1126 case 14: 1127 op = cff_op_neg; 1128 break; 1129 case 15: 1130 op = cff_op_eq; 1131 break; 1132 case 16: 1133 op = cff_op_callothersubr; 1134 break; 1135 case 17: 1136 op = cff_op_pop; 1137 break; 1138 case 18: 1139 op = cff_op_drop; 1140 break; 1141 case 20: 1142 op = cff_op_put; 1143 break; 1144 case 21: 1145 op = cff_op_get; 1146 break; 1147 case 22: 1148 op = cff_op_ifelse; 1149 break; 1150 case 23: 1151 op = cff_op_random; 1152 break; 1153 case 24: 1154 op = cff_op_mul; 1155 break; 1156 case 26: 1157 op = cff_op_sqrt; 1158 break; 1159 case 27: 1160 op = cff_op_dup; 1161 break; 1162 case 28: 1163 op = cff_op_exch; 1164 break; 1165 case 29: 1166 op = cff_op_index; 1167 break; 1168 case 30: 1169 op = cff_op_roll; 1170 break; 1171 case 33: 1172 op = cff_op_setcurrentpoint; 1173 break; 1174 case 34: 1175 op = cff_op_hflex; 1176 break; 1177 case 35: 1178 op = cff_op_flex; 1179 break; 1180 case 36: 1181 op = cff_op_hflex1; 1182 break; 1183 case 37: 1184 op = cff_op_flex1; 1185 break; 1186 default: 1187 FT_TRACE4(( " unknown op (12, %d)\n", v )); 1188 break; 1189 } 1190 } 1191 break; 1192 case 13: 1193 op = cff_op_hsbw; 1194 break; 1195 case 14: 1196 op = cff_op_endchar; 1197 break; 1198 case 16: 1199 op = cff_op_blend; 1200 break; 1201 case 18: 1202 op = cff_op_hstemhm; 1203 break; 1204 case 19: 1205 op = cff_op_hintmask; 1206 break; 1207 case 20: 1208 op = cff_op_cntrmask; 1209 break; 1210 case 21: 1211 op = cff_op_rmoveto; 1212 break; 1213 case 22: 1214 op = cff_op_hmoveto; 1215 break; 1216 case 23: 1217 op = cff_op_vstemhm; 1218 break; 1219 case 24: 1220 op = cff_op_rcurveline; 1221 break; 1222 case 25: 1223 op = cff_op_rlinecurve; 1224 break; 1225 case 26: 1226 op = cff_op_vvcurveto; 1227 break; 1228 case 27: 1229 op = cff_op_hhcurveto; 1230 break; 1231 case 29: 1232 op = cff_op_callgsubr; 1233 break; 1234 case 30: 1235 op = cff_op_vhcurveto; 1236 break; 1237 case 31: 1238 op = cff_op_hvcurveto; 1239 break; 1240 default: 1241 FT_TRACE4(( " unknown op (%d)\n", v )); 1242 break; 1243 } 1244 1245 if ( op == cff_op_unknown ) 1246 continue; 1247 1248 /* check arguments */ 1249 req_args = cff_argument_counts[op]; 1250 if ( req_args & CFF_COUNT_CHECK_WIDTH ) 1251 { 1252 if ( num_args > 0 && decoder->read_width ) 1253 { 1254 /* If `nominal_width' is non-zero, the number is really a */ 1255 /* difference against `nominal_width'. Else, the number here */ 1256 /* is truly a width, not a difference against `nominal_width'. */ 1257 /* If the font does not set `nominal_width', then */ 1258 /* `nominal_width' defaults to zero, and so we can set */ 1259 /* `glyph_width' to `nominal_width' plus number on the stack */ 1260 /* -- for either case. */ 1261 1262 FT_Int set_width_ok; 1263 1264 1265 switch ( op ) 1266 { 1267 case cff_op_hmoveto: 1268 case cff_op_vmoveto: 1269 set_width_ok = num_args & 2; 1270 break; 1271 1272 case cff_op_hstem: 1273 case cff_op_vstem: 1274 case cff_op_hstemhm: 1275 case cff_op_vstemhm: 1276 case cff_op_rmoveto: 1277 case cff_op_hintmask: 1278 case cff_op_cntrmask: 1279 set_width_ok = num_args & 1; 1280 break; 1281 1282 case cff_op_endchar: 1283 /* If there is a width specified for endchar, we either have */ 1284 /* 1 argument or 5 arguments. We like to argue. */ 1285 set_width_ok = ( num_args == 5 ) || ( num_args == 1 ); 1286 break; 1287 1288 default: 1289 set_width_ok = 0; 1290 break; 1291 } 1292 1293 if ( set_width_ok ) 1294 { 1295 decoder->glyph_width = decoder->nominal_width + 1296 ( stack[0] >> 16 ); 1297 1298 if ( decoder->width_only ) 1299 { 1300 /* we only want the advance width; stop here */ 1301 break; 1302 } 1303 1304 /* Consumed an argument. */ 1305 num_args--; 1306 } 1307 } 1308 1309 decoder->read_width = 0; 1310 req_args = 0; 1311 } 1312 1313 req_args &= 0x000F; 1314 if ( num_args < req_args ) 1315 goto Stack_Underflow; 1316 args -= req_args; 1317 num_args -= req_args; 1318 1319 /* At this point, `args' points to the first argument of the */ 1320 /* operand in case `req_args' isn't zero. Otherwise, we have */ 1321 /* to adjust `args' manually. */ 1322 1323 /* Note that we only pop arguments from the stack which we */ 1324 /* really need and can digest so that we can continue in case */ 1325 /* of superfluous stack elements. */ 1326 1327 switch ( op ) 1328 { 1329 case cff_op_hstem: 1330 case cff_op_vstem: 1331 case cff_op_hstemhm: 1332 case cff_op_vstemhm: 1333 /* the number of arguments is always even here */ 1334 FT_TRACE4(( 1335 op == cff_op_hstem ? " hstem\n" : 1336 ( op == cff_op_vstem ? " vstem\n" : 1337 ( op == cff_op_hstemhm ? " hstemhm\n" : " vstemhm\n" ) ) )); 1338 1339 if ( hinter ) 1340 hinter->stems( hinter->hints, 1341 ( op == cff_op_hstem || op == cff_op_hstemhm ), 1342 num_args / 2, 1343 args - ( num_args & ~1 ) ); 1344 1345 decoder->num_hints += num_args / 2; 1346 args = stack; 1347 break; 1348 1349 case cff_op_hintmask: 1350 case cff_op_cntrmask: 1351 FT_TRACE4(( op == cff_op_hintmask ? " hintmask" : " cntrmask" )); 1352 1353 /* implement vstem when needed -- */ 1354 /* the specification doesn't say it, but this also works */ 1355 /* with the 'cntrmask' operator */ 1356 /* */ 1357 if ( num_args > 0 ) 1358 { 1359 if ( hinter ) 1360 hinter->stems( hinter->hints, 1361 0, 1362 num_args / 2, 1363 args - ( num_args & ~1 ) ); 1364 1365 decoder->num_hints += num_args / 2; 1366 } 1367 1368 /* In a valid charstring there must be at least one byte */ 1369 /* after `hintmask' or `cntrmask' (e.g., for a `return' */ 1370 /* instruction). Additionally, there must be space for */ 1371 /* `num_hints' bits. */ 1372 1373 if ( ( ip + ( ( decoder->num_hints + 7 ) >> 3 ) ) >= limit ) 1374 goto Syntax_Error; 1375 1376 if ( hinter ) 1377 { 1378 if ( op == cff_op_hintmask ) 1379 hinter->hintmask( hinter->hints, 1380 builder->current->n_points, 1381 decoder->num_hints, 1382 ip ); 1383 else 1384 hinter->counter( hinter->hints, 1385 decoder->num_hints, 1386 ip ); 1387 } 1388 1389 #ifdef FT_DEBUG_LEVEL_TRACE 1390 { 1391 FT_UInt maskbyte; 1392 1393 1394 FT_TRACE4(( " (maskbytes:" )); 1395 1396 for ( maskbyte = 0; 1397 maskbyte < (FT_UInt)( ( decoder->num_hints + 7 ) >> 3 ); 1398 maskbyte++, ip++ ) 1399 FT_TRACE4(( " 0x%02X", *ip )); 1400 1401 FT_TRACE4(( ")\n" )); 1402 } 1403 #else 1404 ip += ( decoder->num_hints + 7 ) >> 3; 1405 #endif 1406 args = stack; 1407 break; 1408 1409 case cff_op_rmoveto: 1410 FT_TRACE4(( " rmoveto\n" )); 1411 1412 cff_builder_close_contour( builder ); 1413 builder->path_begun = 0; 1414 x += args[-2]; 1415 y += args[-1]; 1416 args = stack; 1417 break; 1418 1419 case cff_op_vmoveto: 1420 FT_TRACE4(( " vmoveto\n" )); 1421 1422 cff_builder_close_contour( builder ); 1423 builder->path_begun = 0; 1424 y += args[-1]; 1425 args = stack; 1426 break; 1427 1428 case cff_op_hmoveto: 1429 FT_TRACE4(( " hmoveto\n" )); 1430 1431 cff_builder_close_contour( builder ); 1432 builder->path_begun = 0; 1433 x += args[-1]; 1434 args = stack; 1435 break; 1436 1437 case cff_op_rlineto: 1438 FT_TRACE4(( " rlineto\n" )); 1439 1440 if ( cff_builder_start_point( builder, x, y ) || 1441 cff_check_points( builder, num_args / 2 ) ) 1442 goto Fail; 1443 1444 if ( num_args < 2 ) 1445 goto Stack_Underflow; 1446 1447 args -= num_args & ~1; 1448 while ( args < decoder->top ) 1449 { 1450 x += args[0]; 1451 y += args[1]; 1452 cff_builder_add_point( builder, x, y, 1 ); 1453 args += 2; 1454 } 1455 args = stack; 1456 break; 1457 1458 case cff_op_hlineto: 1459 case cff_op_vlineto: 1460 { 1461 FT_Int phase = ( op == cff_op_hlineto ); 1462 1463 1464 FT_TRACE4(( op == cff_op_hlineto ? " hlineto\n" 1465 : " vlineto\n" )); 1466 1467 if ( num_args < 0 ) 1468 goto Stack_Underflow; 1469 1470 /* there exist subsetted fonts (found in PDFs) */ 1471 /* which call `hlineto' without arguments */ 1472 if ( num_args == 0 ) 1473 break; 1474 1475 if ( cff_builder_start_point( builder, x, y ) || 1476 cff_check_points( builder, num_args ) ) 1477 goto Fail; 1478 1479 args = stack; 1480 while ( args < decoder->top ) 1481 { 1482 if ( phase ) 1483 x += args[0]; 1484 else 1485 y += args[0]; 1486 1487 if ( cff_builder_add_point1( builder, x, y ) ) 1488 goto Fail; 1489 1490 args++; 1491 phase ^= 1; 1492 } 1493 args = stack; 1494 } 1495 break; 1496 1497 case cff_op_rrcurveto: 1498 { 1499 FT_Int nargs; 1500 1501 1502 FT_TRACE4(( " rrcurveto\n" )); 1503 1504 if ( num_args < 6 ) 1505 goto Stack_Underflow; 1506 1507 nargs = num_args - num_args % 6; 1508 1509 if ( cff_builder_start_point( builder, x, y ) || 1510 cff_check_points( builder, nargs / 2 ) ) 1511 goto Fail; 1512 1513 args -= nargs; 1514 while ( args < decoder->top ) 1515 { 1516 x += args[0]; 1517 y += args[1]; 1518 cff_builder_add_point( builder, x, y, 0 ); 1519 x += args[2]; 1520 y += args[3]; 1521 cff_builder_add_point( builder, x, y, 0 ); 1522 x += args[4]; 1523 y += args[5]; 1524 cff_builder_add_point( builder, x, y, 1 ); 1525 args += 6; 1526 } 1527 args = stack; 1528 } 1529 break; 1530 1531 case cff_op_vvcurveto: 1532 { 1533 FT_Int nargs; 1534 1535 1536 FT_TRACE4(( " vvcurveto\n" )); 1537 1538 if ( num_args < 4 ) 1539 goto Stack_Underflow; 1540 1541 /* if num_args isn't of the form 4n or 4n+1, */ 1542 /* we enforce it by clearing the second bit */ 1543 1544 nargs = num_args & ~2; 1545 1546 if ( cff_builder_start_point( builder, x, y ) ) 1547 goto Fail; 1548 1549 args -= nargs; 1550 1551 if ( nargs & 1 ) 1552 { 1553 x += args[0]; 1554 args++; 1555 nargs--; 1556 } 1557 1558 if ( cff_check_points( builder, 3 * ( nargs / 4 ) ) ) 1559 goto Fail; 1560 1561 while ( args < decoder->top ) 1562 { 1563 y += args[0]; 1564 cff_builder_add_point( builder, x, y, 0 ); 1565 x += args[1]; 1566 y += args[2]; 1567 cff_builder_add_point( builder, x, y, 0 ); 1568 y += args[3]; 1569 cff_builder_add_point( builder, x, y, 1 ); 1570 args += 4; 1571 } 1572 args = stack; 1573 } 1574 break; 1575 1576 case cff_op_hhcurveto: 1577 { 1578 FT_Int nargs; 1579 1580 1581 FT_TRACE4(( " hhcurveto\n" )); 1582 1583 if ( num_args < 4 ) 1584 goto Stack_Underflow; 1585 1586 /* if num_args isn't of the form 4n or 4n+1, */ 1587 /* we enforce it by clearing the second bit */ 1588 1589 nargs = num_args & ~2; 1590 1591 if ( cff_builder_start_point( builder, x, y ) ) 1592 goto Fail; 1593 1594 args -= nargs; 1595 if ( nargs & 1 ) 1596 { 1597 y += args[0]; 1598 args++; 1599 nargs--; 1600 } 1601 1602 if ( cff_check_points( builder, 3 * ( nargs / 4 ) ) ) 1603 goto Fail; 1604 1605 while ( args < decoder->top ) 1606 { 1607 x += args[0]; 1608 cff_builder_add_point( builder, x, y, 0 ); 1609 x += args[1]; 1610 y += args[2]; 1611 cff_builder_add_point( builder, x, y, 0 ); 1612 x += args[3]; 1613 cff_builder_add_point( builder, x, y, 1 ); 1614 args += 4; 1615 } 1616 args = stack; 1617 } 1618 break; 1619 1620 case cff_op_vhcurveto: 1621 case cff_op_hvcurveto: 1622 { 1623 FT_Int phase; 1624 FT_Int nargs; 1625 1626 1627 FT_TRACE4(( op == cff_op_vhcurveto ? " vhcurveto\n" 1628 : " hvcurveto\n" )); 1629 1630 if ( cff_builder_start_point( builder, x, y ) ) 1631 goto Fail; 1632 1633 if ( num_args < 4 ) 1634 goto Stack_Underflow; 1635 1636 /* if num_args isn't of the form 8n, 8n+1, 8n+4, or 8n+5, */ 1637 /* we enforce it by clearing the second bit */ 1638 1639 nargs = num_args & ~2; 1640 1641 args -= nargs; 1642 if ( cff_check_points( builder, ( nargs / 4 ) * 3 ) ) 1643 goto Stack_Underflow; 1644 1645 phase = ( op == cff_op_hvcurveto ); 1646 1647 while ( nargs >= 4 ) 1648 { 1649 nargs -= 4; 1650 if ( phase ) 1651 { 1652 x += args[0]; 1653 cff_builder_add_point( builder, x, y, 0 ); 1654 x += args[1]; 1655 y += args[2]; 1656 cff_builder_add_point( builder, x, y, 0 ); 1657 y += args[3]; 1658 if ( nargs == 1 ) 1659 x += args[4]; 1660 cff_builder_add_point( builder, x, y, 1 ); 1661 } 1662 else 1663 { 1664 y += args[0]; 1665 cff_builder_add_point( builder, x, y, 0 ); 1666 x += args[1]; 1667 y += args[2]; 1668 cff_builder_add_point( builder, x, y, 0 ); 1669 x += args[3]; 1670 if ( nargs == 1 ) 1671 y += args[4]; 1672 cff_builder_add_point( builder, x, y, 1 ); 1673 } 1674 args += 4; 1675 phase ^= 1; 1676 } 1677 args = stack; 1678 } 1679 break; 1680 1681 case cff_op_rlinecurve: 1682 { 1683 FT_Int num_lines; 1684 FT_Int nargs; 1685 1686 1687 FT_TRACE4(( " rlinecurve\n" )); 1688 1689 if ( num_args < 8 ) 1690 goto Stack_Underflow; 1691 1692 nargs = num_args & ~1; 1693 num_lines = ( nargs - 6 ) / 2; 1694 1695 if ( cff_builder_start_point( builder, x, y ) || 1696 cff_check_points( builder, num_lines + 3 ) ) 1697 goto Fail; 1698 1699 args -= nargs; 1700 1701 /* first, add the line segments */ 1702 while ( num_lines > 0 ) 1703 { 1704 x += args[0]; 1705 y += args[1]; 1706 cff_builder_add_point( builder, x, y, 1 ); 1707 args += 2; 1708 num_lines--; 1709 } 1710 1711 /* then the curve */ 1712 x += args[0]; 1713 y += args[1]; 1714 cff_builder_add_point( builder, x, y, 0 ); 1715 x += args[2]; 1716 y += args[3]; 1717 cff_builder_add_point( builder, x, y, 0 ); 1718 x += args[4]; 1719 y += args[5]; 1720 cff_builder_add_point( builder, x, y, 1 ); 1721 args = stack; 1722 } 1723 break; 1724 1725 case cff_op_rcurveline: 1726 { 1727 FT_Int num_curves; 1728 FT_Int nargs; 1729 1730 1731 FT_TRACE4(( " rcurveline\n" )); 1732 1733 if ( num_args < 8 ) 1734 goto Stack_Underflow; 1735 1736 nargs = num_args - 2; 1737 nargs = nargs - nargs % 6 + 2; 1738 num_curves = ( nargs - 2 ) / 6; 1739 1740 if ( cff_builder_start_point( builder, x, y ) || 1741 cff_check_points( builder, num_curves * 3 + 2 ) ) 1742 goto Fail; 1743 1744 args -= nargs; 1745 1746 /* first, add the curves */ 1747 while ( num_curves > 0 ) 1748 { 1749 x += args[0]; 1750 y += args[1]; 1751 cff_builder_add_point( builder, x, y, 0 ); 1752 x += args[2]; 1753 y += args[3]; 1754 cff_builder_add_point( builder, x, y, 0 ); 1755 x += args[4]; 1756 y += args[5]; 1757 cff_builder_add_point( builder, x, y, 1 ); 1758 args += 6; 1759 num_curves--; 1760 } 1761 1762 /* then the final line */ 1763 x += args[0]; 1764 y += args[1]; 1765 cff_builder_add_point( builder, x, y, 1 ); 1766 args = stack; 1767 } 1768 break; 1769 1770 case cff_op_hflex1: 1771 { 1772 FT_Pos start_y; 1773 1774 1775 FT_TRACE4(( " hflex1\n" )); 1776 1777 /* adding five more points: 4 control points, 1 on-curve point */ 1778 /* -- make sure we have enough space for the start point if it */ 1779 /* needs to be added */ 1780 if ( cff_builder_start_point( builder, x, y ) || 1781 cff_check_points( builder, 6 ) ) 1782 goto Fail; 1783 1784 /* record the starting point's y position for later use */ 1785 start_y = y; 1786 1787 /* first control point */ 1788 x += args[0]; 1789 y += args[1]; 1790 cff_builder_add_point( builder, x, y, 0 ); 1791 1792 /* second control point */ 1793 x += args[2]; 1794 y += args[3]; 1795 cff_builder_add_point( builder, x, y, 0 ); 1796 1797 /* join point; on curve, with y-value the same as the last */ 1798 /* control point's y-value */ 1799 x += args[4]; 1800 cff_builder_add_point( builder, x, y, 1 ); 1801 1802 /* third control point, with y-value the same as the join */ 1803 /* point's y-value */ 1804 x += args[5]; 1805 cff_builder_add_point( builder, x, y, 0 ); 1806 1807 /* fourth control point */ 1808 x += args[6]; 1809 y += args[7]; 1810 cff_builder_add_point( builder, x, y, 0 ); 1811 1812 /* ending point, with y-value the same as the start */ 1813 x += args[8]; 1814 y = start_y; 1815 cff_builder_add_point( builder, x, y, 1 ); 1816 1817 args = stack; 1818 break; 1819 } 1820 1821 case cff_op_hflex: 1822 { 1823 FT_Pos start_y; 1824 1825 1826 FT_TRACE4(( " hflex\n" )); 1827 1828 /* adding six more points; 4 control points, 2 on-curve points */ 1829 if ( cff_builder_start_point( builder, x, y ) || 1830 cff_check_points( builder, 6 ) ) 1831 goto Fail; 1832 1833 /* record the starting point's y-position for later use */ 1834 start_y = y; 1835 1836 /* first control point */ 1837 x += args[0]; 1838 cff_builder_add_point( builder, x, y, 0 ); 1839 1840 /* second control point */ 1841 x += args[1]; 1842 y += args[2]; 1843 cff_builder_add_point( builder, x, y, 0 ); 1844 1845 /* join point; on curve, with y-value the same as the last */ 1846 /* control point's y-value */ 1847 x += args[3]; 1848 cff_builder_add_point( builder, x, y, 1 ); 1849 1850 /* third control point, with y-value the same as the join */ 1851 /* point's y-value */ 1852 x += args[4]; 1853 cff_builder_add_point( builder, x, y, 0 ); 1854 1855 /* fourth control point */ 1856 x += args[5]; 1857 y = start_y; 1858 cff_builder_add_point( builder, x, y, 0 ); 1859 1860 /* ending point, with y-value the same as the start point's */ 1861 /* y-value -- we don't add this point, though */ 1862 x += args[6]; 1863 cff_builder_add_point( builder, x, y, 1 ); 1864 1865 args = stack; 1866 break; 1867 } 1868 1869 case cff_op_flex1: 1870 { 1871 FT_Pos start_x, start_y; /* record start x, y values for */ 1872 /* alter use */ 1873 FT_Fixed dx = 0, dy = 0; /* used in horizontal/vertical */ 1874 /* algorithm below */ 1875 FT_Int horizontal, count; 1876 FT_Fixed* temp; 1877 1878 1879 FT_TRACE4(( " flex1\n" )); 1880 1881 /* adding six more points; 4 control points, 2 on-curve points */ 1882 if ( cff_builder_start_point( builder, x, y ) || 1883 cff_check_points( builder, 6 ) ) 1884 goto Fail; 1885 1886 /* record the starting point's x, y position for later use */ 1887 start_x = x; 1888 start_y = y; 1889 1890 /* XXX: figure out whether this is supposed to be a horizontal */ 1891 /* or vertical flex; the Type 2 specification is vague... */ 1892 1893 temp = args; 1894 1895 /* grab up to the last argument */ 1896 for ( count = 5; count > 0; count-- ) 1897 { 1898 dx += temp[0]; 1899 dy += temp[1]; 1900 temp += 2; 1901 } 1902 1903 if ( dx < 0 ) 1904 dx = -dx; 1905 if ( dy < 0 ) 1906 dy = -dy; 1907 1908 /* strange test, but here it is... */ 1909 horizontal = ( dx > dy ); 1910 1911 for ( count = 5; count > 0; count-- ) 1912 { 1913 x += args[0]; 1914 y += args[1]; 1915 cff_builder_add_point( builder, x, y, 1916 (FT_Bool)( count == 3 ) ); 1917 args += 2; 1918 } 1919 1920 /* is last operand an x- or y-delta? */ 1921 if ( horizontal ) 1922 { 1923 x += args[0]; 1924 y = start_y; 1925 } 1926 else 1927 { 1928 x = start_x; 1929 y += args[0]; 1930 } 1931 1932 cff_builder_add_point( builder, x, y, 1 ); 1933 1934 args = stack; 1935 break; 1936 } 1937 1938 case cff_op_flex: 1939 { 1940 FT_UInt count; 1941 1942 1943 FT_TRACE4(( " flex\n" )); 1944 1945 if ( cff_builder_start_point( builder, x, y ) || 1946 cff_check_points( builder, 6 ) ) 1947 goto Fail; 1948 1949 for ( count = 6; count > 0; count-- ) 1950 { 1951 x += args[0]; 1952 y += args[1]; 1953 cff_builder_add_point( builder, x, y, 1954 (FT_Bool)( count == 4 || count == 1 ) ); 1955 args += 2; 1956 } 1957 1958 args = stack; 1959 } 1960 break; 1961 1962 case cff_op_seac: 1963 FT_TRACE4(( " seac\n" )); 1964 1965 error = cff_operator_seac( decoder, 1966 args[0], args[1], args[2], 1967 (FT_Int)( args[3] >> 16 ), 1968 (FT_Int)( args[4] >> 16 ) ); 1969 1970 /* add current outline to the glyph slot */ 1971 FT_GlyphLoader_Add( builder->loader ); 1972 1973 /* return now! */ 1974 FT_TRACE4(( "\n" )); 1975 return error; 1976 1977 case cff_op_endchar: 1978 FT_TRACE4(( " endchar\n" )); 1979 1980 /* We are going to emulate the seac operator. */ 1981 if ( num_args >= 4 ) 1982 { 1983 /* Save glyph width so that the subglyphs don't overwrite it. */ 1984 FT_Pos glyph_width = decoder->glyph_width; 1985 1986 1987 error = cff_operator_seac( decoder, 1988 0L, args[-4], args[-3], 1989 (FT_Int)( args[-2] >> 16 ), 1990 (FT_Int)( args[-1] >> 16 ) ); 1991 1992 decoder->glyph_width = glyph_width; 1993 } 1994 else 1995 { 1996 if ( !error ) 1997 error = FT_Err_Ok; 1998 1999 cff_builder_close_contour( builder ); 2000 2001 /* close hints recording session */ 2002 if ( hinter ) 2003 { 2004 if ( hinter->close( hinter->hints, 2005 builder->current->n_points ) ) 2006 goto Syntax_Error; 2007 2008 /* apply hints to the loaded glyph outline now */ 2009 hinter->apply( hinter->hints, 2010 builder->current, 2011 (PSH_Globals)builder->hints_globals, 2012 decoder->hint_mode ); 2013 } 2014 2015 /* add current outline to the glyph slot */ 2016 FT_GlyphLoader_Add( builder->loader ); 2017 } 2018 2019 /* return now! */ 2020 FT_TRACE4(( "\n" )); 2021 return error; 2022 2023 case cff_op_abs: 2024 FT_TRACE4(( " abs\n" )); 2025 2026 if ( args[0] < 0 ) 2027 args[0] = -args[0]; 2028 args++; 2029 break; 2030 2031 case cff_op_add: 2032 FT_TRACE4(( " add\n" )); 2033 2034 args[0] += args[1]; 2035 args++; 2036 break; 2037 2038 case cff_op_sub: 2039 FT_TRACE4(( " sub\n" )); 2040 2041 args[0] -= args[1]; 2042 args++; 2043 break; 2044 2045 case cff_op_div: 2046 FT_TRACE4(( " div\n" )); 2047 2048 args[0] = FT_DivFix( args[0], args[1] ); 2049 args++; 2050 break; 2051 2052 case cff_op_neg: 2053 FT_TRACE4(( " neg\n" )); 2054 2055 args[0] = -args[0]; 2056 args++; 2057 break; 2058 2059 case cff_op_random: 2060 { 2061 FT_Fixed Rand; 2062 2063 2064 FT_TRACE4(( " rand\n" )); 2065 2066 Rand = seed; 2067 if ( Rand >= 0x8000L ) 2068 Rand++; 2069 2070 args[0] = Rand; 2071 seed = FT_MulFix( seed, 0x10000L - seed ); 2072 if ( seed == 0 ) 2073 seed += 0x2873; 2074 args++; 2075 } 2076 break; 2077 2078 case cff_op_mul: 2079 FT_TRACE4(( " mul\n" )); 2080 2081 args[0] = FT_MulFix( args[0], args[1] ); 2082 args++; 2083 break; 2084 2085 case cff_op_sqrt: 2086 FT_TRACE4(( " sqrt\n" )); 2087 2088 if ( args[0] > 0 ) 2089 { 2090 FT_Int count = 9; 2091 FT_Fixed root = args[0]; 2092 FT_Fixed new_root; 2093 2094 2095 for (;;) 2096 { 2097 new_root = ( root + FT_DivFix( args[0], root ) + 1 ) >> 1; 2098 if ( new_root == root || count <= 0 ) 2099 break; 2100 root = new_root; 2101 } 2102 args[0] = new_root; 2103 } 2104 else 2105 args[0] = 0; 2106 args++; 2107 break; 2108 2109 case cff_op_drop: 2110 /* nothing */ 2111 FT_TRACE4(( " drop\n" )); 2112 2113 break; 2114 2115 case cff_op_exch: 2116 { 2117 FT_Fixed tmp; 2118 2119 2120 FT_TRACE4(( " exch\n" )); 2121 2122 tmp = args[0]; 2123 args[0] = args[1]; 2124 args[1] = tmp; 2125 args += 2; 2126 } 2127 break; 2128 2129 case cff_op_index: 2130 { 2131 FT_Int idx = (FT_Int)( args[0] >> 16 ); 2132 2133 2134 FT_TRACE4(( " index\n" )); 2135 2136 if ( idx < 0 ) 2137 idx = 0; 2138 else if ( idx > num_args - 2 ) 2139 idx = num_args - 2; 2140 args[0] = args[-( idx + 1 )]; 2141 args++; 2142 } 2143 break; 2144 2145 case cff_op_roll: 2146 { 2147 FT_Int count = (FT_Int)( args[0] >> 16 ); 2148 FT_Int idx = (FT_Int)( args[1] >> 16 ); 2149 2150 2151 FT_TRACE4(( " roll\n" )); 2152 2153 if ( count <= 0 ) 2154 count = 1; 2155 2156 args -= count; 2157 if ( args < stack ) 2158 goto Stack_Underflow; 2159 2160 if ( idx >= 0 ) 2161 { 2162 while ( idx > 0 ) 2163 { 2164 FT_Fixed tmp = args[count - 1]; 2165 FT_Int i; 2166 2167 2168 for ( i = count - 2; i >= 0; i-- ) 2169 args[i + 1] = args[i]; 2170 args[0] = tmp; 2171 idx--; 2172 } 2173 } 2174 else 2175 { 2176 while ( idx < 0 ) 2177 { 2178 FT_Fixed tmp = args[0]; 2179 FT_Int i; 2180 2181 2182 for ( i = 0; i < count - 1; i++ ) 2183 args[i] = args[i + 1]; 2184 args[count - 1] = tmp; 2185 idx++; 2186 } 2187 } 2188 args += count; 2189 } 2190 break; 2191 2192 case cff_op_dup: 2193 FT_TRACE4(( " dup\n" )); 2194 2195 args[1] = args[0]; 2196 args += 2; 2197 break; 2198 2199 case cff_op_put: 2200 { 2201 FT_Fixed val = args[0]; 2202 FT_Int idx = (FT_Int)( args[1] >> 16 ); 2203 2204 2205 FT_TRACE4(( " put\n" )); 2206 2207 if ( idx >= 0 && idx < CFF_MAX_TRANS_ELEMENTS ) 2208 decoder->buildchar[idx] = val; 2209 } 2210 break; 2211 2212 case cff_op_get: 2213 { 2214 FT_Int idx = (FT_Int)( args[0] >> 16 ); 2215 FT_Fixed val = 0; 2216 2217 2218 FT_TRACE4(( " get\n" )); 2219 2220 if ( idx >= 0 && idx < CFF_MAX_TRANS_ELEMENTS ) 2221 val = decoder->buildchar[idx]; 2222 2223 args[0] = val; 2224 args++; 2225 } 2226 break; 2227 2228 case cff_op_store: 2229 FT_TRACE4(( " store\n")); 2230 2231 goto Unimplemented; 2232 2233 case cff_op_load: 2234 FT_TRACE4(( " load\n" )); 2235 2236 goto Unimplemented; 2237 2238 case cff_op_dotsection: 2239 /* this operator is deprecated and ignored by the parser */ 2240 FT_TRACE4(( " dotsection\n" )); 2241 break; 2242 2243 case cff_op_closepath: 2244 /* this is an invalid Type 2 operator; however, there */ 2245 /* exist fonts which are incorrectly converted from probably */ 2246 /* Type 1 to CFF, and some parsers seem to accept it */ 2247 2248 FT_TRACE4(( " closepath (invalid op)\n" )); 2249 2250 args = stack; 2251 break; 2252 2253 case cff_op_hsbw: 2254 /* this is an invalid Type 2 operator; however, there */ 2255 /* exist fonts which are incorrectly converted from probably */ 2256 /* Type 1 to CFF, and some parsers seem to accept it */ 2257 2258 FT_TRACE4(( " hsbw (invalid op)\n" )); 2259 2260 decoder->glyph_width = decoder->nominal_width + ( args[1] >> 16 ); 2261 2262 decoder->builder.left_bearing.x = args[0]; 2263 decoder->builder.left_bearing.y = 0; 2264 2265 x = decoder->builder.pos_x + args[0]; 2266 y = decoder->builder.pos_y; 2267 args = stack; 2268 break; 2269 2270 case cff_op_sbw: 2271 /* this is an invalid Type 2 operator; however, there */ 2272 /* exist fonts which are incorrectly converted from probably */ 2273 /* Type 1 to CFF, and some parsers seem to accept it */ 2274 2275 FT_TRACE4(( " sbw (invalid op)\n" )); 2276 2277 decoder->glyph_width = decoder->nominal_width + ( args[2] >> 16 ); 2278 2279 decoder->builder.left_bearing.x = args[0]; 2280 decoder->builder.left_bearing.y = args[1]; 2281 2282 x = decoder->builder.pos_x + args[0]; 2283 y = decoder->builder.pos_y + args[1]; 2284 args = stack; 2285 break; 2286 2287 case cff_op_setcurrentpoint: 2288 /* this is an invalid Type 2 operator; however, there */ 2289 /* exist fonts which are incorrectly converted from probably */ 2290 /* Type 1 to CFF, and some parsers seem to accept it */ 2291 2292 FT_TRACE4(( " setcurrentpoint (invalid op)\n" )); 2293 2294 x = decoder->builder.pos_x + args[0]; 2295 y = decoder->builder.pos_y + args[1]; 2296 args = stack; 2297 break; 2298 2299 case cff_op_callothersubr: 2300 /* this is an invalid Type 2 operator; however, there */ 2301 /* exist fonts which are incorrectly converted from probably */ 2302 /* Type 1 to CFF, and some parsers seem to accept it */ 2303 2304 FT_TRACE4(( " callothersubr (invalid op)\n" )); 2305 2306 /* subsequent `pop' operands should add the arguments, */ 2307 /* this is the implementation described for `unknown' other */ 2308 /* subroutines in the Type1 spec. */ 2309 /* */ 2310 /* XXX Fix return arguments (see discussion below). */ 2311 args -= 2 + ( args[-2] >> 16 ); 2312 if ( args < stack ) 2313 goto Stack_Underflow; 2314 break; 2315 2316 case cff_op_pop: 2317 /* this is an invalid Type 2 operator; however, there */ 2318 /* exist fonts which are incorrectly converted from probably */ 2319 /* Type 1 to CFF, and some parsers seem to accept it */ 2320 2321 FT_TRACE4(( " pop (invalid op)\n" )); 2322 2323 /* XXX Increasing `args' is wrong: After a certain number of */ 2324 /* `pop's we get a stack overflow. Reason for doing it is */ 2325 /* code like this (actually found in a CFF font): */ 2326 /* */ 2327 /* 17 1 3 callothersubr */ 2328 /* pop */ 2329 /* callsubr */ 2330 /* */ 2331 /* Since we handle `callothersubr' as a no-op, and */ 2332 /* `callsubr' needs at least one argument, `pop' can't be a */ 2333 /* no-op too as it basically should be. */ 2334 /* */ 2335 /* The right solution would be to provide real support for */ 2336 /* `callothersubr' as done in `t1decode.c', however, given */ 2337 /* the fact that CFF fonts with `pop' are invalid, it is */ 2338 /* questionable whether it is worth the time. */ 2339 args++; 2340 break; 2341 2342 case cff_op_and: 2343 { 2344 FT_Fixed cond = args[0] && args[1]; 2345 2346 2347 FT_TRACE4(( " and\n" )); 2348 2349 args[0] = cond ? 0x10000L : 0; 2350 args++; 2351 } 2352 break; 2353 2354 case cff_op_or: 2355 { 2356 FT_Fixed cond = args[0] || args[1]; 2357 2358 2359 FT_TRACE4(( " or\n" )); 2360 2361 args[0] = cond ? 0x10000L : 0; 2362 args++; 2363 } 2364 break; 2365 2366 case cff_op_eq: 2367 { 2368 FT_Fixed cond = !args[0]; 2369 2370 2371 FT_TRACE4(( " eq\n" )); 2372 2373 args[0] = cond ? 0x10000L : 0; 2374 args++; 2375 } 2376 break; 2377 2378 case cff_op_ifelse: 2379 { 2380 FT_Fixed cond = ( args[2] <= args[3] ); 2381 2382 2383 FT_TRACE4(( " ifelse\n" )); 2384 2385 if ( !cond ) 2386 args[0] = args[1]; 2387 args++; 2388 } 2389 break; 2390 2391 case cff_op_callsubr: 2392 { 2393 FT_UInt idx = (FT_UInt)( ( args[0] >> 16 ) + 2394 decoder->locals_bias ); 2395 2396 2397 FT_TRACE4(( " callsubr(%d)\n", idx )); 2398 2399 if ( idx >= decoder->num_locals ) 2400 { 2401 FT_ERROR(( "cff_decoder_parse_charstrings:" 2402 " invalid local subr index\n" )); 2403 goto Syntax_Error; 2404 } 2405 2406 if ( zone - decoder->zones >= CFF_MAX_SUBRS_CALLS ) 2407 { 2408 FT_ERROR(( "cff_decoder_parse_charstrings:" 2409 " too many nested subrs\n" )); 2410 goto Syntax_Error; 2411 } 2412 2413 zone->cursor = ip; /* save current instruction pointer */ 2414 2415 zone++; 2416 zone->base = decoder->locals[idx]; 2417 zone->limit = decoder->locals[idx + 1]; 2418 zone->cursor = zone->base; 2419 2420 if ( !zone->base || zone->limit == zone->base ) 2421 { 2422 FT_ERROR(( "cff_decoder_parse_charstrings:" 2423 " invoking empty subrs\n" )); 2424 goto Syntax_Error; 2425 } 2426 2427 decoder->zone = zone; 2428 ip = zone->base; 2429 limit = zone->limit; 2430 } 2431 break; 2432 2433 case cff_op_callgsubr: 2434 { 2435 FT_UInt idx = (FT_UInt)( ( args[0] >> 16 ) + 2436 decoder->globals_bias ); 2437 2438 2439 FT_TRACE4(( " callgsubr(%d)\n", idx )); 2440 2441 if ( idx >= decoder->num_globals ) 2442 { 2443 FT_ERROR(( "cff_decoder_parse_charstrings:" 2444 " invalid global subr index\n" )); 2445 goto Syntax_Error; 2446 } 2447 2448 if ( zone - decoder->zones >= CFF_MAX_SUBRS_CALLS ) 2449 { 2450 FT_ERROR(( "cff_decoder_parse_charstrings:" 2451 " too many nested subrs\n" )); 2452 goto Syntax_Error; 2453 } 2454 2455 zone->cursor = ip; /* save current instruction pointer */ 2456 2457 zone++; 2458 zone->base = decoder->globals[idx]; 2459 zone->limit = decoder->globals[idx + 1]; 2460 zone->cursor = zone->base; 2461 2462 if ( !zone->base || zone->limit == zone->base ) 2463 { 2464 FT_ERROR(( "cff_decoder_parse_charstrings:" 2465 " invoking empty subrs\n" )); 2466 goto Syntax_Error; 2467 } 2468 2469 decoder->zone = zone; 2470 ip = zone->base; 2471 limit = zone->limit; 2472 } 2473 break; 2474 2475 case cff_op_return: 2476 FT_TRACE4(( " return\n" )); 2477 2478 if ( decoder->zone <= decoder->zones ) 2479 { 2480 FT_ERROR(( "cff_decoder_parse_charstrings:" 2481 " unexpected return\n" )); 2482 goto Syntax_Error; 2483 } 2484 2485 decoder->zone--; 2486 zone = decoder->zone; 2487 ip = zone->cursor; 2488 limit = zone->limit; 2489 break; 2490 2491 default: 2492 Unimplemented: 2493 FT_ERROR(( "Unimplemented opcode: %d", ip[-1] )); 2494 2495 if ( ip[-1] == 12 ) 2496 FT_ERROR(( " %d", ip[0] )); 2497 FT_ERROR(( "\n" )); 2498 2499 return FT_THROW( Unimplemented_Feature ); 2500 } 2501 2502 decoder->top = args; 2503 2504 if ( decoder->top - stack >= CFF_MAX_OPERANDS ) 2505 goto Stack_Overflow; 2506 2507 } /* general operator processing */ 2508 2509 } /* while ip < limit */ 2510 2511 FT_TRACE4(( "..end..\n\n" )); 2512 2513 Fail: 2514 return error; 2515 2516 Syntax_Error: 2517 FT_TRACE4(( "cff_decoder_parse_charstrings: syntax error\n" )); 2518 return FT_THROW( Invalid_File_Format ); 2519 2520 Stack_Underflow: 2521 FT_TRACE4(( "cff_decoder_parse_charstrings: stack underflow\n" )); 2522 return FT_THROW( Too_Few_Arguments ); 2523 2524 Stack_Overflow: 2525 FT_TRACE4(( "cff_decoder_parse_charstrings: stack overflow\n" )); 2526 return FT_THROW( Stack_Overflow ); 2527 } 2528 2529 #endif /* CFF_CONFIG_OPTION_OLD_ENGINE */ 2530 2531 2532 /*************************************************************************/ 2533 /*************************************************************************/ 2534 /*************************************************************************/ 2535 /********** *********/ 2536 /********** *********/ 2537 /********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/ 2538 /********** *********/ 2539 /********** The following code is in charge of computing *********/ 2540 /********** the maximum advance width of the font. It *********/ 2541 /********** quickly processes each glyph charstring to *********/ 2542 /********** extract the value from either a `sbw' or `seac' *********/ 2543 /********** operator. *********/ 2544 /********** *********/ 2545 /*************************************************************************/ 2546 /*************************************************************************/ 2547 /*************************************************************************/ 2548 2549 2550 #if 0 /* unused until we support pure CFF fonts */ 2551 2552 2553 FT_LOCAL_DEF( FT_Error ) 2554 cff_compute_max_advance( TT_Face face, 2555 FT_Int* max_advance ) 2556 { 2557 FT_Error error = FT_Err_Ok; 2558 CFF_Decoder decoder; 2559 FT_Int glyph_index; 2560 CFF_Font cff = (CFF_Font)face->other; 2561 2562 2563 *max_advance = 0; 2564 2565 /* Initialize load decoder */ 2566 cff_decoder_init( &decoder, face, 0, 0, 0, 0 ); 2567 2568 decoder.builder.metrics_only = 1; 2569 decoder.builder.load_points = 0; 2570 2571 /* For each glyph, parse the glyph charstring and extract */ 2572 /* the advance width. */ 2573 for ( glyph_index = 0; glyph_index < face->root.num_glyphs; 2574 glyph_index++ ) 2575 { 2576 FT_Byte* charstring; 2577 FT_ULong charstring_len; 2578 2579 2580 /* now get load the unscaled outline */ 2581 error = cff_get_glyph_data( face, glyph_index, 2582 &charstring, &charstring_len ); 2583 if ( !error ) 2584 { 2585 error = cff_decoder_prepare( &decoder, size, glyph_index ); 2586 if ( !error ) 2587 error = cff_decoder_parse_charstrings( &decoder, 2588 charstring, 2589 charstring_len ); 2590 2591 cff_free_glyph_data( face, &charstring, &charstring_len ); 2592 } 2593 2594 /* ignore the error if one has occurred -- skip to next glyph */ 2595 error = FT_Err_Ok; 2596 } 2597 2598 *max_advance = decoder.builder.advance.x; 2599 2600 return FT_Err_Ok; 2601 } 2602 2603 2604 #endif /* 0 */ 2605 2606 2607 FT_LOCAL_DEF( FT_Error ) 2608 cff_slot_load( CFF_GlyphSlot glyph, 2609 CFF_Size size, 2610 FT_UInt glyph_index, 2611 FT_Int32 load_flags ) 2612 { 2613 FT_Error error; 2614 CFF_Decoder decoder; 2615 TT_Face face = (TT_Face)glyph->root.face; 2616 FT_Bool hinting, scaled, force_scaling; 2617 CFF_Font cff = (CFF_Font)face->extra.data; 2618 2619 FT_Matrix font_matrix; 2620 FT_Vector font_offset; 2621 2622 2623 force_scaling = FALSE; 2624 2625 /* in a CID-keyed font, consider `glyph_index' as a CID and map */ 2626 /* it immediately to the real glyph_index -- if it isn't a */ 2627 /* subsetted font, glyph_indices and CIDs are identical, though */ 2628 if ( cff->top_font.font_dict.cid_registry != 0xFFFFU && 2629 cff->charset.cids ) 2630 { 2631 /* don't handle CID 0 (.notdef) which is directly mapped to GID 0 */ 2632 if ( glyph_index != 0 ) 2633 { 2634 glyph_index = cff_charset_cid_to_gindex( &cff->charset, 2635 glyph_index ); 2636 if ( glyph_index == 0 ) 2637 return FT_THROW( Invalid_Argument ); 2638 } 2639 } 2640 else if ( glyph_index >= cff->num_glyphs ) 2641 return FT_THROW( Invalid_Argument ); 2642 2643 if ( load_flags & FT_LOAD_NO_RECURSE ) 2644 load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING; 2645 2646 glyph->x_scale = 0x10000L; 2647 glyph->y_scale = 0x10000L; 2648 if ( size ) 2649 { 2650 glyph->x_scale = size->root.metrics.x_scale; 2651 glyph->y_scale = size->root.metrics.y_scale; 2652 } 2653 2654 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS 2655 2656 /* try to load embedded bitmap if any */ 2657 /* */ 2658 /* XXX: The convention should be emphasized in */ 2659 /* the documents because it can be confusing. */ 2660 if ( size ) 2661 { 2662 CFF_Face cff_face = (CFF_Face)size->root.face; 2663 SFNT_Service sfnt = (SFNT_Service)cff_face->sfnt; 2664 FT_Stream stream = cff_face->root.stream; 2665 2666 2667 if ( size->strike_index != 0xFFFFFFFFUL && 2668 sfnt->load_eblc && 2669 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) 2670 { 2671 TT_SBit_MetricsRec metrics; 2672 2673 2674 error = sfnt->load_sbit_image( face, 2675 size->strike_index, 2676 glyph_index, 2677 (FT_Int)load_flags, 2678 stream, 2679 &glyph->root.bitmap, 2680 &metrics ); 2681 2682 if ( !error ) 2683 { 2684 FT_Bool has_vertical_info; 2685 FT_UShort advance; 2686 FT_Short dummy; 2687 2688 2689 glyph->root.outline.n_points = 0; 2690 glyph->root.outline.n_contours = 0; 2691 2692 glyph->root.metrics.width = (FT_Pos)metrics.width << 6; 2693 glyph->root.metrics.height = (FT_Pos)metrics.height << 6; 2694 2695 glyph->root.metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6; 2696 glyph->root.metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6; 2697 glyph->root.metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6; 2698 2699 glyph->root.metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6; 2700 glyph->root.metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6; 2701 glyph->root.metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6; 2702 2703 glyph->root.format = FT_GLYPH_FORMAT_BITMAP; 2704 2705 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 2706 { 2707 glyph->root.bitmap_left = metrics.vertBearingX; 2708 glyph->root.bitmap_top = metrics.vertBearingY; 2709 } 2710 else 2711 { 2712 glyph->root.bitmap_left = metrics.horiBearingX; 2713 glyph->root.bitmap_top = metrics.horiBearingY; 2714 } 2715 2716 /* compute linear advance widths */ 2717 2718 ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, 2719 glyph_index, 2720 &dummy, 2721 &advance ); 2722 glyph->root.linearHoriAdvance = advance; 2723 2724 has_vertical_info = FT_BOOL( 2725 face->vertical_info && 2726 face->vertical.number_Of_VMetrics > 0 ); 2727 2728 /* get the vertical metrics from the vtmx table if we have one */ 2729 if ( has_vertical_info ) 2730 { 2731 ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, 2732 glyph_index, 2733 &dummy, 2734 &advance ); 2735 glyph->root.linearVertAdvance = advance; 2736 } 2737 else 2738 { 2739 /* make up vertical ones */ 2740 if ( face->os2.version != 0xFFFFU ) 2741 glyph->root.linearVertAdvance = (FT_Pos) 2742 ( face->os2.sTypoAscender - face->os2.sTypoDescender ); 2743 else 2744 glyph->root.linearVertAdvance = (FT_Pos) 2745 ( face->horizontal.Ascender - face->horizontal.Descender ); 2746 } 2747 2748 return error; 2749 } 2750 } 2751 } 2752 2753 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ 2754 2755 /* return immediately if we only want the embedded bitmaps */ 2756 if ( load_flags & FT_LOAD_SBITS_ONLY ) 2757 return FT_THROW( Invalid_Argument ); 2758 2759 /* if we have a CID subfont, use its matrix (which has already */ 2760 /* been multiplied with the root matrix) */ 2761 2762 /* this scaling is only relevant if the PS hinter isn't active */ 2763 if ( cff->num_subfonts ) 2764 { 2765 FT_ULong top_upm, sub_upm; 2766 FT_Byte fd_index = cff_fd_select_get( &cff->fd_select, 2767 glyph_index ); 2768 2769 2770 if ( fd_index >= cff->num_subfonts ) 2771 fd_index = (FT_Byte)( cff->num_subfonts - 1 ); 2772 2773 top_upm = cff->top_font.font_dict.units_per_em; 2774 sub_upm = cff->subfonts[fd_index]->font_dict.units_per_em; 2775 2776 2777 font_matrix = cff->subfonts[fd_index]->font_dict.font_matrix; 2778 font_offset = cff->subfonts[fd_index]->font_dict.font_offset; 2779 2780 if ( top_upm != sub_upm ) 2781 { 2782 glyph->x_scale = FT_MulDiv( glyph->x_scale, top_upm, sub_upm ); 2783 glyph->y_scale = FT_MulDiv( glyph->y_scale, top_upm, sub_upm ); 2784 2785 force_scaling = TRUE; 2786 } 2787 } 2788 else 2789 { 2790 font_matrix = cff->top_font.font_dict.font_matrix; 2791 font_offset = cff->top_font.font_dict.font_offset; 2792 } 2793 2794 glyph->root.outline.n_points = 0; 2795 glyph->root.outline.n_contours = 0; 2796 2797 /* top-level code ensures that FT_LOAD_NO_HINTING is set */ 2798 /* if FT_LOAD_NO_SCALE is active */ 2799 hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_HINTING ) == 0 ); 2800 scaled = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 ); 2801 2802 glyph->hint = hinting; 2803 glyph->scaled = scaled; 2804 glyph->root.format = FT_GLYPH_FORMAT_OUTLINE; /* by default */ 2805 2806 { 2807 #ifdef CFF_CONFIG_OPTION_OLD_ENGINE 2808 CFF_Driver driver = (CFF_Driver)FT_FACE_DRIVER( face ); 2809 #endif 2810 2811 2812 FT_Byte* charstring; 2813 FT_ULong charstring_len; 2814 2815 2816 cff_decoder_init( &decoder, face, size, glyph, hinting, 2817 FT_LOAD_TARGET_MODE( load_flags ) ); 2818 2819 if ( load_flags & FT_LOAD_ADVANCE_ONLY ) 2820 decoder.width_only = TRUE; 2821 2822 decoder.builder.no_recurse = 2823 (FT_Bool)( load_flags & FT_LOAD_NO_RECURSE ); 2824 2825 /* now load the unscaled outline */ 2826 error = cff_get_glyph_data( face, glyph_index, 2827 &charstring, &charstring_len ); 2828 if ( error ) 2829 goto Glyph_Build_Finished; 2830 2831 error = cff_decoder_prepare( &decoder, size, glyph_index ); 2832 if ( error ) 2833 goto Glyph_Build_Finished; 2834 2835 #ifdef CFF_CONFIG_OPTION_OLD_ENGINE 2836 /* choose which CFF renderer to use */ 2837 if ( driver->hinting_engine == FT_CFF_HINTING_FREETYPE ) 2838 error = cff_decoder_parse_charstrings( &decoder, 2839 charstring, 2840 charstring_len ); 2841 else 2842 #endif 2843 { 2844 error = cf2_decoder_parse_charstrings( &decoder, 2845 charstring, 2846 charstring_len ); 2847 2848 /* Adobe's engine uses 16.16 numbers everywhere; */ 2849 /* as a consequence, glyphs larger than 2000ppem get rejected */ 2850 if ( FT_ERR_EQ( error, Glyph_Too_Big ) ) 2851 { 2852 /* XXX to be implemented */ 2853 } 2854 } 2855 2856 cff_free_glyph_data( face, &charstring, charstring_len ); 2857 2858 if ( error ) 2859 goto Glyph_Build_Finished; 2860 2861 #ifdef FT_CONFIG_OPTION_INCREMENTAL 2862 /* Control data and length may not be available for incremental */ 2863 /* fonts. */ 2864 if ( face->root.internal->incremental_interface ) 2865 { 2866 glyph->root.control_data = 0; 2867 glyph->root.control_len = 0; 2868 } 2869 else 2870 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 2871 2872 /* We set control_data and control_len if charstrings is loaded. */ 2873 /* See how charstring loads at cff_index_access_element() in */ 2874 /* cffload.c. */ 2875 { 2876 CFF_Index csindex = &cff->charstrings_index; 2877 2878 2879 if ( csindex->offsets ) 2880 { 2881 glyph->root.control_data = csindex->bytes + 2882 csindex->offsets[glyph_index] - 1; 2883 glyph->root.control_len = charstring_len; 2884 } 2885 } 2886 2887 Glyph_Build_Finished: 2888 /* save new glyph tables, if no error */ 2889 if ( !error ) 2890 cff_builder_done( &decoder.builder ); 2891 /* XXX: anything to do for broken glyph entry? */ 2892 } 2893 2894 #ifdef FT_CONFIG_OPTION_INCREMENTAL 2895 2896 /* Incremental fonts can optionally override the metrics. */ 2897 if ( !error && 2898 face->root.internal->incremental_interface && 2899 face->root.internal->incremental_interface->funcs->get_glyph_metrics ) 2900 { 2901 FT_Incremental_MetricsRec metrics; 2902 2903 2904 metrics.bearing_x = decoder.builder.left_bearing.x; 2905 metrics.bearing_y = 0; 2906 metrics.advance = decoder.builder.advance.x; 2907 metrics.advance_v = decoder.builder.advance.y; 2908 2909 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( 2910 face->root.internal->incremental_interface->object, 2911 glyph_index, FALSE, &metrics ); 2912 2913 decoder.builder.left_bearing.x = metrics.bearing_x; 2914 decoder.builder.advance.x = metrics.advance; 2915 decoder.builder.advance.y = metrics.advance_v; 2916 } 2917 2918 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ 2919 2920 if ( !error ) 2921 { 2922 /* Now, set the metrics -- this is rather simple, as */ 2923 /* the left side bearing is the xMin, and the top side */ 2924 /* bearing the yMax. */ 2925 2926 /* For composite glyphs, return only left side bearing and */ 2927 /* advance width. */ 2928 if ( load_flags & FT_LOAD_NO_RECURSE ) 2929 { 2930 FT_Slot_Internal internal = glyph->root.internal; 2931 2932 2933 glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x; 2934 glyph->root.metrics.horiAdvance = decoder.glyph_width; 2935 internal->glyph_matrix = font_matrix; 2936 internal->glyph_delta = font_offset; 2937 internal->glyph_transformed = 1; 2938 } 2939 else 2940 { 2941 FT_BBox cbox; 2942 FT_Glyph_Metrics* metrics = &glyph->root.metrics; 2943 FT_Vector advance; 2944 FT_Bool has_vertical_info; 2945 2946 2947 /* copy the _unscaled_ advance width */ 2948 metrics->horiAdvance = decoder.glyph_width; 2949 glyph->root.linearHoriAdvance = decoder.glyph_width; 2950 glyph->root.internal->glyph_transformed = 0; 2951 2952 has_vertical_info = FT_BOOL( face->vertical_info && 2953 face->vertical.number_Of_VMetrics > 0 ); 2954 2955 /* get the vertical metrics from the vtmx table if we have one */ 2956 if ( has_vertical_info ) 2957 { 2958 FT_Short vertBearingY = 0; 2959 FT_UShort vertAdvance = 0; 2960 2961 2962 ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, 2963 glyph_index, 2964 &vertBearingY, 2965 &vertAdvance ); 2966 metrics->vertBearingY = vertBearingY; 2967 metrics->vertAdvance = vertAdvance; 2968 } 2969 else 2970 { 2971 /* make up vertical ones */ 2972 if ( face->os2.version != 0xFFFFU ) 2973 metrics->vertAdvance = (FT_Pos)( face->os2.sTypoAscender - 2974 face->os2.sTypoDescender ); 2975 else 2976 metrics->vertAdvance = (FT_Pos)( face->horizontal.Ascender - 2977 face->horizontal.Descender ); 2978 } 2979 2980 glyph->root.linearVertAdvance = metrics->vertAdvance; 2981 2982 glyph->root.format = FT_GLYPH_FORMAT_OUTLINE; 2983 2984 glyph->root.outline.flags = 0; 2985 if ( size && size->root.metrics.y_ppem < 24 ) 2986 glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION; 2987 2988 glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL; 2989 2990 if ( !( font_matrix.xx == 0x10000L && 2991 font_matrix.yy == 0x10000L && 2992 font_matrix.xy == 0 && 2993 font_matrix.yx == 0 ) ) 2994 FT_Outline_Transform( &glyph->root.outline, &font_matrix ); 2995 2996 if ( !( font_offset.x == 0 && 2997 font_offset.y == 0 ) ) 2998 FT_Outline_Translate( &glyph->root.outline, 2999 font_offset.x, font_offset.y ); 3000 3001 advance.x = metrics->horiAdvance; 3002 advance.y = 0; 3003 FT_Vector_Transform( &advance, &font_matrix ); 3004 metrics->horiAdvance = advance.x + font_offset.x; 3005 3006 advance.x = 0; 3007 advance.y = metrics->vertAdvance; 3008 FT_Vector_Transform( &advance, &font_matrix ); 3009 metrics->vertAdvance = advance.y + font_offset.y; 3010 3011 if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 || force_scaling ) 3012 { 3013 /* scale the outline and the metrics */ 3014 FT_Int n; 3015 FT_Outline* cur = &glyph->root.outline; 3016 FT_Vector* vec = cur->points; 3017 FT_Fixed x_scale = glyph->x_scale; 3018 FT_Fixed y_scale = glyph->y_scale; 3019 3020 3021 /* First of all, scale the points */ 3022 if ( !hinting || !decoder.builder.hints_funcs ) 3023 for ( n = cur->n_points; n > 0; n--, vec++ ) 3024 { 3025 vec->x = FT_MulFix( vec->x, x_scale ); 3026 vec->y = FT_MulFix( vec->y, y_scale ); 3027 } 3028 3029 /* Then scale the metrics */ 3030 metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale ); 3031 metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale ); 3032 } 3033 3034 /* compute the other metrics */ 3035 FT_Outline_Get_CBox( &glyph->root.outline, &cbox ); 3036 3037 metrics->width = cbox.xMax - cbox.xMin; 3038 metrics->height = cbox.yMax - cbox.yMin; 3039 3040 metrics->horiBearingX = cbox.xMin; 3041 metrics->horiBearingY = cbox.yMax; 3042 3043 if ( has_vertical_info ) 3044 metrics->vertBearingX = metrics->horiBearingX - 3045 metrics->horiAdvance / 2; 3046 else 3047 { 3048 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) 3049 ft_synthesize_vertical_metrics( metrics, 3050 metrics->vertAdvance ); 3051 } 3052 } 3053 } 3054 3055 return error; 3056 } 3057 3058 3059 /* END */ 3060
