1 /***************************************************************************/ 2 /* */ 3 /* pshrec.c */ 4 /* */ 5 /* FreeType PostScript hints recorder (body). */ 6 /* */ 7 /* Copyright 2001-2004, 2007, 2009, 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_FREETYPE_H 21 #include FT_INTERNAL_OBJECTS_H 22 #include FT_INTERNAL_DEBUG_H 23 #include FT_INTERNAL_CALC_H 24 25 #include "pshrec.h" 26 #include "pshalgo.h" 27 28 #include "pshnterr.h" 29 30 #undef FT_COMPONENT 31 #define FT_COMPONENT trace_pshrec 32 33 #ifdef DEBUG_HINTER 34 PS_Hints ps_debug_hints = 0; 35 int ps_debug_no_horz_hints = 0; 36 int ps_debug_no_vert_hints = 0; 37 #endif 38 39 40 /*************************************************************************/ 41 /*************************************************************************/ 42 /***** *****/ 43 /***** PS_HINT MANAGEMENT *****/ 44 /***** *****/ 45 /*************************************************************************/ 46 /*************************************************************************/ 47 48 /* destroy hints table */ 49 static void 50 ps_hint_table_done( PS_Hint_Table table, 51 FT_Memory memory ) 52 { 53 FT_FREE( table->hints ); 54 table->num_hints = 0; 55 table->max_hints = 0; 56 } 57 58 59 /* ensure that a table can contain "count" elements */ 60 static FT_Error 61 ps_hint_table_ensure( PS_Hint_Table table, 62 FT_UInt count, 63 FT_Memory memory ) 64 { 65 FT_UInt old_max = table->max_hints; 66 FT_UInt new_max = count; 67 FT_Error error = FT_Err_Ok; 68 69 70 if ( new_max > old_max ) 71 { 72 /* try to grow the table */ 73 new_max = FT_PAD_CEIL( new_max, 8 ); 74 if ( !FT_RENEW_ARRAY( table->hints, old_max, new_max ) ) 75 table->max_hints = new_max; 76 } 77 return error; 78 } 79 80 81 static FT_Error 82 ps_hint_table_alloc( PS_Hint_Table table, 83 FT_Memory memory, 84 PS_Hint *ahint ) 85 { 86 FT_Error error = FT_Err_Ok; 87 FT_UInt count; 88 PS_Hint hint = 0; 89 90 91 count = table->num_hints; 92 count++; 93 94 if ( count >= table->max_hints ) 95 { 96 error = ps_hint_table_ensure( table, count, memory ); 97 if ( error ) 98 goto Exit; 99 } 100 101 hint = table->hints + count - 1; 102 hint->pos = 0; 103 hint->len = 0; 104 hint->flags = 0; 105 106 table->num_hints = count; 107 108 Exit: 109 *ahint = hint; 110 return error; 111 } 112 113 114 /*************************************************************************/ 115 /*************************************************************************/ 116 /***** *****/ 117 /***** PS_MASK MANAGEMENT *****/ 118 /***** *****/ 119 /*************************************************************************/ 120 /*************************************************************************/ 121 122 /* destroy mask */ 123 static void 124 ps_mask_done( PS_Mask mask, 125 FT_Memory memory ) 126 { 127 FT_FREE( mask->bytes ); 128 mask->num_bits = 0; 129 mask->max_bits = 0; 130 mask->end_point = 0; 131 } 132 133 134 /* ensure that a mask can contain "count" bits */ 135 static FT_Error 136 ps_mask_ensure( PS_Mask mask, 137 FT_UInt count, 138 FT_Memory memory ) 139 { 140 FT_UInt old_max = ( mask->max_bits + 7 ) >> 3; 141 FT_UInt new_max = ( count + 7 ) >> 3; 142 FT_Error error = FT_Err_Ok; 143 144 145 if ( new_max > old_max ) 146 { 147 new_max = FT_PAD_CEIL( new_max, 8 ); 148 if ( !FT_RENEW_ARRAY( mask->bytes, old_max, new_max ) ) 149 mask->max_bits = new_max * 8; 150 } 151 return error; 152 } 153 154 155 /* test a bit value in a given mask */ 156 static FT_Int 157 ps_mask_test_bit( PS_Mask mask, 158 FT_Int idx ) 159 { 160 if ( (FT_UInt)idx >= mask->num_bits ) 161 return 0; 162 163 return mask->bytes[idx >> 3] & ( 0x80 >> ( idx & 7 ) ); 164 } 165 166 167 /* clear a given bit */ 168 static void 169 ps_mask_clear_bit( PS_Mask mask, 170 FT_Int idx ) 171 { 172 FT_Byte* p; 173 174 175 if ( (FT_UInt)idx >= mask->num_bits ) 176 return; 177 178 p = mask->bytes + ( idx >> 3 ); 179 p[0] = (FT_Byte)( p[0] & ~( 0x80 >> ( idx & 7 ) ) ); 180 } 181 182 183 /* set a given bit, possibly grow the mask */ 184 static FT_Error 185 ps_mask_set_bit( PS_Mask mask, 186 FT_Int idx, 187 FT_Memory memory ) 188 { 189 FT_Error error = FT_Err_Ok; 190 FT_Byte* p; 191 192 193 if ( idx < 0 ) 194 goto Exit; 195 196 if ( (FT_UInt)idx >= mask->num_bits ) 197 { 198 error = ps_mask_ensure( mask, idx + 1, memory ); 199 if ( error ) 200 goto Exit; 201 202 mask->num_bits = idx + 1; 203 } 204 205 p = mask->bytes + ( idx >> 3 ); 206 p[0] = (FT_Byte)( p[0] | ( 0x80 >> ( idx & 7 ) ) ); 207 208 Exit: 209 return error; 210 } 211 212 213 /* destroy mask table */ 214 static void 215 ps_mask_table_done( PS_Mask_Table table, 216 FT_Memory memory ) 217 { 218 FT_UInt count = table->max_masks; 219 PS_Mask mask = table->masks; 220 221 222 for ( ; count > 0; count--, mask++ ) 223 ps_mask_done( mask, memory ); 224 225 FT_FREE( table->masks ); 226 table->num_masks = 0; 227 table->max_masks = 0; 228 } 229 230 231 /* ensure that a mask table can contain "count" masks */ 232 static FT_Error 233 ps_mask_table_ensure( PS_Mask_Table table, 234 FT_UInt count, 235 FT_Memory memory ) 236 { 237 FT_UInt old_max = table->max_masks; 238 FT_UInt new_max = count; 239 FT_Error error = FT_Err_Ok; 240 241 242 if ( new_max > old_max ) 243 { 244 new_max = FT_PAD_CEIL( new_max, 8 ); 245 if ( !FT_RENEW_ARRAY( table->masks, old_max, new_max ) ) 246 table->max_masks = new_max; 247 } 248 return error; 249 } 250 251 252 /* allocate a new mask in a table */ 253 static FT_Error 254 ps_mask_table_alloc( PS_Mask_Table table, 255 FT_Memory memory, 256 PS_Mask *amask ) 257 { 258 FT_UInt count; 259 FT_Error error = FT_Err_Ok; 260 PS_Mask mask = 0; 261 262 263 count = table->num_masks; 264 count++; 265 266 if ( count > table->max_masks ) 267 { 268 error = ps_mask_table_ensure( table, count, memory ); 269 if ( error ) 270 goto Exit; 271 } 272 273 mask = table->masks + count - 1; 274 mask->num_bits = 0; 275 mask->end_point = 0; 276 table->num_masks = count; 277 278 Exit: 279 *amask = mask; 280 return error; 281 } 282 283 284 /* return last hint mask in a table, create one if the table is empty */ 285 static FT_Error 286 ps_mask_table_last( PS_Mask_Table table, 287 FT_Memory memory, 288 PS_Mask *amask ) 289 { 290 FT_Error error = FT_Err_Ok; 291 FT_UInt count; 292 PS_Mask mask; 293 294 295 count = table->num_masks; 296 if ( count == 0 ) 297 { 298 error = ps_mask_table_alloc( table, memory, &mask ); 299 if ( error ) 300 goto Exit; 301 } 302 else 303 mask = table->masks + count - 1; 304 305 Exit: 306 *amask = mask; 307 return error; 308 } 309 310 311 /* set a new mask to a given bit range */ 312 static FT_Error 313 ps_mask_table_set_bits( PS_Mask_Table table, 314 const FT_Byte* source, 315 FT_UInt bit_pos, 316 FT_UInt bit_count, 317 FT_Memory memory ) 318 { 319 FT_Error error; 320 PS_Mask mask; 321 322 323 error = ps_mask_table_last( table, memory, &mask ); 324 if ( error ) 325 goto Exit; 326 327 error = ps_mask_ensure( mask, bit_count, memory ); 328 if ( error ) 329 goto Exit; 330 331 mask->num_bits = bit_count; 332 333 /* now, copy bits */ 334 { 335 FT_Byte* read = (FT_Byte*)source + ( bit_pos >> 3 ); 336 FT_Int rmask = 0x80 >> ( bit_pos & 7 ); 337 FT_Byte* write = mask->bytes; 338 FT_Int wmask = 0x80; 339 FT_Int val; 340 341 342 for ( ; bit_count > 0; bit_count-- ) 343 { 344 val = write[0] & ~wmask; 345 346 if ( read[0] & rmask ) 347 val |= wmask; 348 349 write[0] = (FT_Byte)val; 350 351 rmask >>= 1; 352 if ( rmask == 0 ) 353 { 354 read++; 355 rmask = 0x80; 356 } 357 358 wmask >>= 1; 359 if ( wmask == 0 ) 360 { 361 write++; 362 wmask = 0x80; 363 } 364 } 365 } 366 367 Exit: 368 return error; 369 } 370 371 372 /* test whether two masks in a table intersect */ 373 static FT_Int 374 ps_mask_table_test_intersect( PS_Mask_Table table, 375 FT_Int index1, 376 FT_Int index2 ) 377 { 378 PS_Mask mask1 = table->masks + index1; 379 PS_Mask mask2 = table->masks + index2; 380 FT_Byte* p1 = mask1->bytes; 381 FT_Byte* p2 = mask2->bytes; 382 FT_UInt count1 = mask1->num_bits; 383 FT_UInt count2 = mask2->num_bits; 384 FT_UInt count; 385 386 387 count = FT_MIN( count1, count2 ); 388 for ( ; count >= 8; count -= 8 ) 389 { 390 if ( p1[0] & p2[0] ) 391 return 1; 392 393 p1++; 394 p2++; 395 } 396 397 if ( count == 0 ) 398 return 0; 399 400 return ( p1[0] & p2[0] ) & ~( 0xFF >> count ); 401 } 402 403 404 /* merge two masks, used by ps_mask_table_merge_all */ 405 static FT_Error 406 ps_mask_table_merge( PS_Mask_Table table, 407 FT_Int index1, 408 FT_Int index2, 409 FT_Memory memory ) 410 { 411 FT_UInt temp; 412 FT_Error error = FT_Err_Ok; 413 414 415 /* swap index1 and index2 so that index1 < index2 */ 416 if ( index1 > index2 ) 417 { 418 temp = index1; 419 index1 = index2; 420 index2 = temp; 421 } 422 423 if ( index1 < index2 && index1 >= 0 && index2 < (FT_Int)table->num_masks ) 424 { 425 /* we need to merge the bitsets of index1 and index2 with a */ 426 /* simple union */ 427 PS_Mask mask1 = table->masks + index1; 428 PS_Mask mask2 = table->masks + index2; 429 FT_UInt count1 = mask1->num_bits; 430 FT_UInt count2 = mask2->num_bits; 431 FT_Int delta; 432 433 434 if ( count2 > 0 ) 435 { 436 FT_UInt pos; 437 FT_Byte* read; 438 FT_Byte* write; 439 440 441 /* if "count2" is greater than "count1", we need to grow the */ 442 /* first bitset, and clear the highest bits */ 443 if ( count2 > count1 ) 444 { 445 error = ps_mask_ensure( mask1, count2, memory ); 446 if ( error ) 447 goto Exit; 448 449 for ( pos = count1; pos < count2; pos++ ) 450 ps_mask_clear_bit( mask1, pos ); 451 } 452 453 /* merge (unite) the bitsets */ 454 read = mask2->bytes; 455 write = mask1->bytes; 456 pos = (FT_UInt)( ( count2 + 7 ) >> 3 ); 457 458 for ( ; pos > 0; pos-- ) 459 { 460 write[0] = (FT_Byte)( write[0] | read[0] ); 461 write++; 462 read++; 463 } 464 } 465 466 /* Now, remove "mask2" from the list. We need to keep the masks */ 467 /* sorted in order of importance, so move table elements. */ 468 mask2->num_bits = 0; 469 mask2->end_point = 0; 470 471 delta = table->num_masks - 1 - index2; /* number of masks to move */ 472 if ( delta > 0 ) 473 { 474 /* move to end of table for reuse */ 475 PS_MaskRec dummy = *mask2; 476 477 478 ft_memmove( mask2, mask2 + 1, delta * sizeof ( PS_MaskRec ) ); 479 480 mask2[delta] = dummy; 481 } 482 483 table->num_masks--; 484 } 485 else 486 FT_TRACE0(( "ps_mask_table_merge: ignoring invalid indices (%d,%d)\n", 487 index1, index2 )); 488 489 Exit: 490 return error; 491 } 492 493 494 /* Try to merge all masks in a given table. This is used to merge */ 495 /* all counter masks into independent counter "paths". */ 496 /* */ 497 static FT_Error 498 ps_mask_table_merge_all( PS_Mask_Table table, 499 FT_Memory memory ) 500 { 501 FT_Int index1, index2; 502 FT_Error error = FT_Err_Ok; 503 504 505 for ( index1 = table->num_masks - 1; index1 > 0; index1-- ) 506 { 507 for ( index2 = index1 - 1; index2 >= 0; index2-- ) 508 { 509 if ( ps_mask_table_test_intersect( table, index1, index2 ) ) 510 { 511 error = ps_mask_table_merge( table, index2, index1, memory ); 512 if ( error ) 513 goto Exit; 514 515 break; 516 } 517 } 518 } 519 520 Exit: 521 return error; 522 } 523 524 525 /*************************************************************************/ 526 /*************************************************************************/ 527 /***** *****/ 528 /***** PS_DIMENSION MANAGEMENT *****/ 529 /***** *****/ 530 /*************************************************************************/ 531 /*************************************************************************/ 532 533 534 /* finalize a given dimension */ 535 static void 536 ps_dimension_done( PS_Dimension dimension, 537 FT_Memory memory ) 538 { 539 ps_mask_table_done( &dimension->counters, memory ); 540 ps_mask_table_done( &dimension->masks, memory ); 541 ps_hint_table_done( &dimension->hints, memory ); 542 } 543 544 545 /* initialize a given dimension */ 546 static void 547 ps_dimension_init( PS_Dimension dimension ) 548 { 549 dimension->hints.num_hints = 0; 550 dimension->masks.num_masks = 0; 551 dimension->counters.num_masks = 0; 552 } 553 554 555 #if 0 556 557 /* set a bit at a given index in the current hint mask */ 558 static FT_Error 559 ps_dimension_set_mask_bit( PS_Dimension dim, 560 FT_UInt idx, 561 FT_Memory memory ) 562 { 563 PS_Mask mask; 564 FT_Error error = FT_Err_Ok; 565 566 567 /* get last hint mask */ 568 error = ps_mask_table_last( &dim->masks, memory, &mask ); 569 if ( error ) 570 goto Exit; 571 572 error = ps_mask_set_bit( mask, idx, memory ); 573 574 Exit: 575 return error; 576 } 577 578 #endif 579 580 /* set the end point in a mask, called from "End" & "Reset" methods */ 581 static void 582 ps_dimension_end_mask( PS_Dimension dim, 583 FT_UInt end_point ) 584 { 585 FT_UInt count = dim->masks.num_masks; 586 587 588 if ( count > 0 ) 589 { 590 PS_Mask mask = dim->masks.masks + count - 1; 591 592 593 mask->end_point = end_point; 594 } 595 } 596 597 598 /* set the end point in the current mask, then create a new empty one */ 599 /* (called by "Reset" method) */ 600 static FT_Error 601 ps_dimension_reset_mask( PS_Dimension dim, 602 FT_UInt end_point, 603 FT_Memory memory ) 604 { 605 PS_Mask mask; 606 607 608 /* end current mask */ 609 ps_dimension_end_mask( dim, end_point ); 610 611 /* allocate new one */ 612 return ps_mask_table_alloc( &dim->masks, memory, &mask ); 613 } 614 615 616 /* set a new mask, called from the "T2Stem" method */ 617 static FT_Error 618 ps_dimension_set_mask_bits( PS_Dimension dim, 619 const FT_Byte* source, 620 FT_UInt source_pos, 621 FT_UInt source_bits, 622 FT_UInt end_point, 623 FT_Memory memory ) 624 { 625 FT_Error error; 626 627 628 /* reset current mask, if any */ 629 error = ps_dimension_reset_mask( dim, end_point, memory ); 630 if ( error ) 631 goto Exit; 632 633 /* set bits in new mask */ 634 error = ps_mask_table_set_bits( &dim->masks, source, 635 source_pos, source_bits, memory ); 636 637 Exit: 638 return error; 639 } 640 641 642 /* add a new single stem (called from "T1Stem" method) */ 643 static FT_Error 644 ps_dimension_add_t1stem( PS_Dimension dim, 645 FT_Int pos, 646 FT_Int len, 647 FT_Memory memory, 648 FT_Int *aindex ) 649 { 650 FT_Error error = FT_Err_Ok; 651 FT_UInt flags = 0; 652 653 654 /* detect ghost stem */ 655 if ( len < 0 ) 656 { 657 flags |= PS_HINT_FLAG_GHOST; 658 if ( len == -21 ) 659 { 660 flags |= PS_HINT_FLAG_BOTTOM; 661 pos += len; 662 } 663 len = 0; 664 } 665 666 if ( aindex ) 667 *aindex = -1; 668 669 /* now, lookup stem in the current hints table */ 670 { 671 PS_Mask mask; 672 FT_UInt idx; 673 FT_UInt max = dim->hints.num_hints; 674 PS_Hint hint = dim->hints.hints; 675 676 677 for ( idx = 0; idx < max; idx++, hint++ ) 678 { 679 if ( hint->pos == pos && hint->len == len ) 680 break; 681 } 682 683 /* we need to create a new hint in the table */ 684 if ( idx >= max ) 685 { 686 error = ps_hint_table_alloc( &dim->hints, memory, &hint ); 687 if ( error ) 688 goto Exit; 689 690 hint->pos = pos; 691 hint->len = len; 692 hint->flags = flags; 693 } 694 695 /* now, store the hint in the current mask */ 696 error = ps_mask_table_last( &dim->masks, memory, &mask ); 697 if ( error ) 698 goto Exit; 699 700 error = ps_mask_set_bit( mask, idx, memory ); 701 if ( error ) 702 goto Exit; 703 704 if ( aindex ) 705 *aindex = (FT_Int)idx; 706 } 707 708 Exit: 709 return error; 710 } 711 712 713 /* add a "hstem3/vstem3" counter to our dimension table */ 714 static FT_Error 715 ps_dimension_add_counter( PS_Dimension dim, 716 FT_Int hint1, 717 FT_Int hint2, 718 FT_Int hint3, 719 FT_Memory memory ) 720 { 721 FT_Error error = FT_Err_Ok; 722 FT_UInt count = dim->counters.num_masks; 723 PS_Mask counter = dim->counters.masks; 724 725 726 /* try to find an existing counter mask that already uses */ 727 /* one of these stems here */ 728 for ( ; count > 0; count--, counter++ ) 729 { 730 if ( ps_mask_test_bit( counter, hint1 ) || 731 ps_mask_test_bit( counter, hint2 ) || 732 ps_mask_test_bit( counter, hint3 ) ) 733 break; 734 } 735 736 /* create a new counter when needed */ 737 if ( count == 0 ) 738 { 739 error = ps_mask_table_alloc( &dim->counters, memory, &counter ); 740 if ( error ) 741 goto Exit; 742 } 743 744 /* now, set the bits for our hints in the counter mask */ 745 error = ps_mask_set_bit( counter, hint1, memory ); 746 if ( error ) 747 goto Exit; 748 749 error = ps_mask_set_bit( counter, hint2, memory ); 750 if ( error ) 751 goto Exit; 752 753 error = ps_mask_set_bit( counter, hint3, memory ); 754 if ( error ) 755 goto Exit; 756 757 Exit: 758 return error; 759 } 760 761 762 /* end of recording session for a given dimension */ 763 static FT_Error 764 ps_dimension_end( PS_Dimension dim, 765 FT_UInt end_point, 766 FT_Memory memory ) 767 { 768 /* end hint mask table */ 769 ps_dimension_end_mask( dim, end_point ); 770 771 /* merge all counter masks into independent "paths" */ 772 return ps_mask_table_merge_all( &dim->counters, memory ); 773 } 774 775 776 /*************************************************************************/ 777 /*************************************************************************/ 778 /***** *****/ 779 /***** PS_RECORDER MANAGEMENT *****/ 780 /***** *****/ 781 /*************************************************************************/ 782 /*************************************************************************/ 783 784 785 /* destroy hints */ 786 FT_LOCAL( void ) 787 ps_hints_done( PS_Hints hints ) 788 { 789 FT_Memory memory = hints->memory; 790 791 792 ps_dimension_done( &hints->dimension[0], memory ); 793 ps_dimension_done( &hints->dimension[1], memory ); 794 795 hints->error = FT_Err_Ok; 796 hints->memory = 0; 797 } 798 799 800 FT_LOCAL( FT_Error ) 801 ps_hints_init( PS_Hints hints, 802 FT_Memory memory ) 803 { 804 FT_MEM_ZERO( hints, sizeof ( *hints ) ); 805 hints->memory = memory; 806 return FT_Err_Ok; 807 } 808 809 810 /* initialize a hints for a new session */ 811 static void 812 ps_hints_open( PS_Hints hints, 813 PS_Hint_Type hint_type ) 814 { 815 switch ( hint_type ) 816 { 817 case PS_HINT_TYPE_1: 818 case PS_HINT_TYPE_2: 819 hints->error = FT_Err_Ok; 820 hints->hint_type = hint_type; 821 822 ps_dimension_init( &hints->dimension[0] ); 823 ps_dimension_init( &hints->dimension[1] ); 824 break; 825 826 default: 827 hints->error = FT_THROW( Invalid_Argument ); 828 hints->hint_type = hint_type; 829 830 FT_TRACE0(( "ps_hints_open: invalid charstring type\n" )); 831 break; 832 } 833 } 834 835 836 /* add one or more stems to the current hints table */ 837 static void 838 ps_hints_stem( PS_Hints hints, 839 FT_Int dimension, 840 FT_UInt count, 841 FT_Long* stems ) 842 { 843 if ( !hints->error ) 844 { 845 /* limit "dimension" to 0..1 */ 846 if ( dimension < 0 || dimension > 1 ) 847 { 848 FT_TRACE0(( "ps_hints_stem: invalid dimension (%d) used\n", 849 dimension )); 850 dimension = ( dimension != 0 ); 851 } 852 853 /* record the stems in the current hints/masks table */ 854 switch ( hints->hint_type ) 855 { 856 case PS_HINT_TYPE_1: /* Type 1 "hstem" or "vstem" operator */ 857 case PS_HINT_TYPE_2: /* Type 2 "hstem" or "vstem" operator */ 858 { 859 PS_Dimension dim = &hints->dimension[dimension]; 860 861 862 for ( ; count > 0; count--, stems += 2 ) 863 { 864 FT_Error error; 865 FT_Memory memory = hints->memory; 866 867 868 error = ps_dimension_add_t1stem( 869 dim, (FT_Int)stems[0], (FT_Int)stems[1], 870 memory, NULL ); 871 if ( error ) 872 { 873 FT_ERROR(( "ps_hints_stem: could not add stem" 874 " (%d,%d) to hints table\n", stems[0], stems[1] )); 875 876 hints->error = error; 877 return; 878 } 879 } 880 break; 881 } 882 883 default: 884 FT_TRACE0(( "ps_hints_stem: called with invalid hint type (%d)\n", 885 hints->hint_type )); 886 break; 887 } 888 } 889 } 890 891 892 /* add one Type1 counter stem to the current hints table */ 893 static void 894 ps_hints_t1stem3( PS_Hints hints, 895 FT_Int dimension, 896 FT_Fixed* stems ) 897 { 898 FT_Error error = FT_Err_Ok; 899 900 901 if ( !hints->error ) 902 { 903 PS_Dimension dim; 904 FT_Memory memory = hints->memory; 905 FT_Int count; 906 FT_Int idx[3]; 907 908 909 /* limit "dimension" to 0..1 */ 910 if ( dimension < 0 || dimension > 1 ) 911 { 912 FT_TRACE0(( "ps_hints_t1stem3: invalid dimension (%d) used\n", 913 dimension )); 914 dimension = ( dimension != 0 ); 915 } 916 917 dim = &hints->dimension[dimension]; 918 919 /* there must be 6 elements in the 'stem' array */ 920 if ( hints->hint_type == PS_HINT_TYPE_1 ) 921 { 922 /* add the three stems to our hints/masks table */ 923 for ( count = 0; count < 3; count++, stems += 2 ) 924 { 925 error = ps_dimension_add_t1stem( dim, 926 (FT_Int)FIXED_TO_INT( stems[0] ), 927 (FT_Int)FIXED_TO_INT( stems[1] ), 928 memory, &idx[count] ); 929 if ( error ) 930 goto Fail; 931 } 932 933 /* now, add the hints to the counters table */ 934 error = ps_dimension_add_counter( dim, idx[0], idx[1], idx[2], 935 memory ); 936 if ( error ) 937 goto Fail; 938 } 939 else 940 { 941 FT_ERROR(( "ps_hints_t1stem3: called with invalid hint type\n" )); 942 error = FT_THROW( Invalid_Argument ); 943 goto Fail; 944 } 945 } 946 947 return; 948 949 Fail: 950 FT_ERROR(( "ps_hints_t1stem3: could not add counter stems to table\n" )); 951 hints->error = error; 952 } 953 954 955 /* reset hints (only with Type 1 hints) */ 956 static void 957 ps_hints_t1reset( PS_Hints hints, 958 FT_UInt end_point ) 959 { 960 FT_Error error = FT_Err_Ok; 961 962 963 if ( !hints->error ) 964 { 965 FT_Memory memory = hints->memory; 966 967 968 if ( hints->hint_type == PS_HINT_TYPE_1 ) 969 { 970 error = ps_dimension_reset_mask( &hints->dimension[0], 971 end_point, memory ); 972 if ( error ) 973 goto Fail; 974 975 error = ps_dimension_reset_mask( &hints->dimension[1], 976 end_point, memory ); 977 if ( error ) 978 goto Fail; 979 } 980 else 981 { 982 /* invalid hint type */ 983 error = FT_THROW( Invalid_Argument ); 984 goto Fail; 985 } 986 } 987 return; 988 989 Fail: 990 hints->error = error; 991 } 992 993 994 /* Type2 "hintmask" operator, add a new hintmask to each direction */ 995 static void 996 ps_hints_t2mask( PS_Hints hints, 997 FT_UInt end_point, 998 FT_UInt bit_count, 999 const FT_Byte* bytes ) 1000 { 1001 FT_Error error; 1002 1003 1004 if ( !hints->error ) 1005 { 1006 PS_Dimension dim = hints->dimension; 1007 FT_Memory memory = hints->memory; 1008 FT_UInt count1 = dim[0].hints.num_hints; 1009 FT_UInt count2 = dim[1].hints.num_hints; 1010 1011 1012 /* check bit count; must be equal to current total hint count */ 1013 if ( bit_count != count1 + count2 ) 1014 { 1015 FT_TRACE0(( "ps_hints_t2mask:" 1016 " called with invalid bitcount %d (instead of %d)\n", 1017 bit_count, count1 + count2 )); 1018 1019 /* simply ignore the operator */ 1020 return; 1021 } 1022 1023 /* set-up new horizontal and vertical hint mask now */ 1024 error = ps_dimension_set_mask_bits( &dim[0], bytes, count2, count1, 1025 end_point, memory ); 1026 if ( error ) 1027 goto Fail; 1028 1029 error = ps_dimension_set_mask_bits( &dim[1], bytes, 0, count2, 1030 end_point, memory ); 1031 if ( error ) 1032 goto Fail; 1033 } 1034 return; 1035 1036 Fail: 1037 hints->error = error; 1038 } 1039 1040 1041 static void 1042 ps_hints_t2counter( PS_Hints hints, 1043 FT_UInt bit_count, 1044 const FT_Byte* bytes ) 1045 { 1046 FT_Error error; 1047 1048 1049 if ( !hints->error ) 1050 { 1051 PS_Dimension dim = hints->dimension; 1052 FT_Memory memory = hints->memory; 1053 FT_UInt count1 = dim[0].hints.num_hints; 1054 FT_UInt count2 = dim[1].hints.num_hints; 1055 1056 1057 /* check bit count, must be equal to current total hint count */ 1058 if ( bit_count != count1 + count2 ) 1059 { 1060 FT_TRACE0(( "ps_hints_t2counter:" 1061 " called with invalid bitcount %d (instead of %d)\n", 1062 bit_count, count1 + count2 )); 1063 1064 /* simply ignore the operator */ 1065 return; 1066 } 1067 1068 /* set-up new horizontal and vertical hint mask now */ 1069 error = ps_dimension_set_mask_bits( &dim[0], bytes, 0, count1, 1070 0, memory ); 1071 if ( error ) 1072 goto Fail; 1073 1074 error = ps_dimension_set_mask_bits( &dim[1], bytes, count1, count2, 1075 0, memory ); 1076 if ( error ) 1077 goto Fail; 1078 } 1079 return; 1080 1081 Fail: 1082 hints->error = error; 1083 } 1084 1085 1086 /* end recording session */ 1087 static FT_Error 1088 ps_hints_close( PS_Hints hints, 1089 FT_UInt end_point ) 1090 { 1091 FT_Error error; 1092 1093 1094 error = hints->error; 1095 if ( !error ) 1096 { 1097 FT_Memory memory = hints->memory; 1098 PS_Dimension dim = hints->dimension; 1099 1100 1101 error = ps_dimension_end( &dim[0], end_point, memory ); 1102 if ( !error ) 1103 { 1104 error = ps_dimension_end( &dim[1], end_point, memory ); 1105 } 1106 } 1107 1108 #ifdef DEBUG_HINTER 1109 if ( !error ) 1110 ps_debug_hints = hints; 1111 #endif 1112 return error; 1113 } 1114 1115 1116 /*************************************************************************/ 1117 /*************************************************************************/ 1118 /***** *****/ 1119 /***** TYPE 1 HINTS RECORDING INTERFACE *****/ 1120 /***** *****/ 1121 /*************************************************************************/ 1122 /*************************************************************************/ 1123 1124 static void 1125 t1_hints_open( T1_Hints hints ) 1126 { 1127 ps_hints_open( (PS_Hints)hints, PS_HINT_TYPE_1 ); 1128 } 1129 1130 static void 1131 t1_hints_stem( T1_Hints hints, 1132 FT_Int dimension, 1133 FT_Fixed* coords ) 1134 { 1135 FT_Pos stems[2]; 1136 1137 1138 stems[0] = FIXED_TO_INT( coords[0] ); 1139 stems[1] = FIXED_TO_INT( coords[1] ); 1140 1141 ps_hints_stem( (PS_Hints)hints, dimension, 1, stems ); 1142 } 1143 1144 1145 FT_LOCAL_DEF( void ) 1146 t1_hints_funcs_init( T1_Hints_FuncsRec* funcs ) 1147 { 1148 FT_MEM_ZERO( (char*)funcs, sizeof ( *funcs ) ); 1149 1150 funcs->open = (T1_Hints_OpenFunc) t1_hints_open; 1151 funcs->close = (T1_Hints_CloseFunc) ps_hints_close; 1152 funcs->stem = (T1_Hints_SetStemFunc) t1_hints_stem; 1153 funcs->stem3 = (T1_Hints_SetStem3Func)ps_hints_t1stem3; 1154 funcs->reset = (T1_Hints_ResetFunc) ps_hints_t1reset; 1155 funcs->apply = (T1_Hints_ApplyFunc) ps_hints_apply; 1156 } 1157 1158 1159 /*************************************************************************/ 1160 /*************************************************************************/ 1161 /***** *****/ 1162 /***** TYPE 2 HINTS RECORDING INTERFACE *****/ 1163 /***** *****/ 1164 /*************************************************************************/ 1165 /*************************************************************************/ 1166 1167 static void 1168 t2_hints_open( T2_Hints hints ) 1169 { 1170 ps_hints_open( (PS_Hints)hints, PS_HINT_TYPE_2 ); 1171 } 1172 1173 1174 static void 1175 t2_hints_stems( T2_Hints hints, 1176 FT_Int dimension, 1177 FT_Int count, 1178 FT_Fixed* coords ) 1179 { 1180 FT_Pos stems[32], y, n; 1181 FT_Int total = count; 1182 1183 1184 y = 0; 1185 while ( total > 0 ) 1186 { 1187 /* determine number of stems to write */ 1188 count = total; 1189 if ( count > 16 ) 1190 count = 16; 1191 1192 /* compute integer stem positions in font units */ 1193 for ( n = 0; n < count * 2; n++ ) 1194 { 1195 y += coords[n]; 1196 stems[n] = FIXED_TO_INT( y ); 1197 } 1198 1199 /* compute lengths */ 1200 for ( n = 0; n < count * 2; n += 2 ) 1201 stems[n + 1] = stems[n + 1] - stems[n]; 1202 1203 /* add them to the current dimension */ 1204 ps_hints_stem( (PS_Hints)hints, dimension, count, stems ); 1205 1206 total -= count; 1207 } 1208 } 1209 1210 1211 FT_LOCAL_DEF( void ) 1212 t2_hints_funcs_init( T2_Hints_FuncsRec* funcs ) 1213 { 1214 FT_MEM_ZERO( funcs, sizeof ( *funcs ) ); 1215 1216 funcs->open = (T2_Hints_OpenFunc) t2_hints_open; 1217 funcs->close = (T2_Hints_CloseFunc) ps_hints_close; 1218 funcs->stems = (T2_Hints_StemsFunc) t2_hints_stems; 1219 funcs->hintmask= (T2_Hints_MaskFunc) ps_hints_t2mask; 1220 funcs->counter = (T2_Hints_CounterFunc)ps_hints_t2counter; 1221 funcs->apply = (T2_Hints_ApplyFunc) ps_hints_apply; 1222 } 1223 1224 1225 /* END */ 1226
