1 /**************************************************************************** 2 * 3 * pshints.c 4 * 5 * Adobe's code for handling CFF hints (body). 6 * 7 * Copyright 2007-2014 Adobe Systems Incorporated. 8 * 9 * This software, and all works of authorship, whether in source or 10 * object code form as indicated by the copyright notice(s) included 11 * herein (collectively, the "Work") is made available, and may only be 12 * used, modified, and distributed under the FreeType Project License, 13 * LICENSE.TXT. Additionally, subject to the terms and conditions of the 14 * FreeType Project License, each contributor to the Work hereby grants 15 * to any individual or legal entity exercising permissions granted by 16 * the FreeType Project License and this section (hereafter, "You" or 17 * "Your") a perpetual, worldwide, non-exclusive, no-charge, 18 * royalty-free, irrevocable (except as stated in this section) patent 19 * license to make, have made, use, offer to sell, sell, import, and 20 * otherwise transfer the Work, where such license applies only to those 21 * patent claims licensable by such contributor that are necessarily 22 * infringed by their contribution(s) alone or by combination of their 23 * contribution(s) with the Work to which such contribution(s) was 24 * submitted. If You institute patent litigation against any entity 25 * (including a cross-claim or counterclaim in a lawsuit) alleging that 26 * the Work or a contribution incorporated within the Work constitutes 27 * direct or contributory patent infringement, then any patent licenses 28 * granted to You under this License for that Work shall terminate as of 29 * the date such litigation is filed. 30 * 31 * By using, modifying, or distributing the Work you indicate that you 32 * have read and understood the terms and conditions of the 33 * FreeType Project License as well as those provided in this section, 34 * and you accept them fully. 35 * 36 */ 37 38 39 #include "psft.h" 40 #include <freetype/internal/ftdebug.h> 41 42 #include "psglue.h" 43 #include "psfont.h" 44 #include "pshints.h" 45 #include "psintrp.h" 46 47 48 /************************************************************************** 49 * 50 * The macro FT_COMPONENT is used in trace mode. It is an implicit 51 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log 52 * messages during execution. 53 */ 54 #undef FT_COMPONENT 55 #define FT_COMPONENT cf2hints 56 57 58 typedef struct CF2_HintMoveRec_ 59 { 60 size_t j; /* index of upper hint map edge */ 61 CF2_Fixed moveUp; /* adjustment to optimum position */ 62 63 } CF2_HintMoveRec, *CF2_HintMove; 64 65 66 /* Compute angular momentum for winding order detection. It is called */ 67 /* for all lines and curves, but not necessarily in element order. */ 68 static CF2_Int cf2_getWindingMomentum(CF2_Fixed x1,CF2_Fixed y1,CF2_Fixed x2,CF2_Fixed y2)69 cf2_getWindingMomentum( CF2_Fixed x1, 70 CF2_Fixed y1, 71 CF2_Fixed x2, 72 CF2_Fixed y2 ) 73 { 74 /* cross product of pt1 position from origin with pt2 position from */ 75 /* pt1; we reduce the precision so that the result fits into 32 bits */ 76 77 return ( x1 >> 16 ) * ( SUB_INT32( y2, y1 ) >> 16 ) - 78 ( y1 >> 16 ) * ( SUB_INT32( x2, x1 ) >> 16 ); 79 } 80 81 82 /* 83 * Construct from a StemHint; this is used as a parameter to 84 * `cf2_blues_capture'. 85 * `hintOrigin' is the character space displacement of a seac accent. 86 * Adjust stem hint for darkening here. 87 * 88 */ 89 static void cf2_hint_init(CF2_Hint hint,const CF2_ArrStack stemHintArray,size_t indexStemHint,const CF2_Font font,CF2_Fixed hintOrigin,CF2_Fixed scale,FT_Bool bottom)90 cf2_hint_init( CF2_Hint hint, 91 const CF2_ArrStack stemHintArray, 92 size_t indexStemHint, 93 const CF2_Font font, 94 CF2_Fixed hintOrigin, 95 CF2_Fixed scale, 96 FT_Bool bottom ) 97 { 98 CF2_Fixed width; 99 const CF2_StemHintRec* stemHint; 100 101 102 FT_ZERO( hint ); 103 104 stemHint = (const CF2_StemHintRec*)cf2_arrstack_getPointer( 105 stemHintArray, 106 indexStemHint ); 107 108 width = SUB_INT32( stemHint->max, stemHint->min ); 109 110 if ( width == cf2_intToFixed( -21 ) ) 111 { 112 /* ghost bottom */ 113 114 if ( bottom ) 115 { 116 hint->csCoord = stemHint->max; 117 hint->flags = CF2_GhostBottom; 118 } 119 else 120 hint->flags = 0; 121 } 122 123 else if ( width == cf2_intToFixed( -20 ) ) 124 { 125 /* ghost top */ 126 127 if ( bottom ) 128 hint->flags = 0; 129 else 130 { 131 hint->csCoord = stemHint->min; 132 hint->flags = CF2_GhostTop; 133 } 134 } 135 136 else if ( width < 0 ) 137 { 138 /* inverted pair */ 139 140 /* 141 * Hints with negative widths were produced by an early version of a 142 * non-Adobe font tool. The Type 2 spec allows edge (ghost) hints 143 * with negative widths, but says 144 * 145 * All other negative widths have undefined meaning. 146 * 147 * CoolType has a silent workaround that negates the hint width; for 148 * permissive mode, we do the same here. 149 * 150 * Note: Such fonts cannot use ghost hints, but should otherwise work. 151 * Note: Some poor hints in our faux fonts can produce negative 152 * widths at some blends. For example, see a light weight of 153 * `u' in ASerifMM. 154 * 155 */ 156 if ( bottom ) 157 { 158 hint->csCoord = stemHint->max; 159 hint->flags = CF2_PairBottom; 160 } 161 else 162 { 163 hint->csCoord = stemHint->min; 164 hint->flags = CF2_PairTop; 165 } 166 } 167 168 else 169 { 170 /* normal pair */ 171 172 if ( bottom ) 173 { 174 hint->csCoord = stemHint->min; 175 hint->flags = CF2_PairBottom; 176 } 177 else 178 { 179 hint->csCoord = stemHint->max; 180 hint->flags = CF2_PairTop; 181 } 182 } 183 184 /* Now that ghost hints have been detected, adjust this edge for */ 185 /* darkening. Bottoms are not changed; tops are incremented by twice */ 186 /* `darkenY'. */ 187 if ( cf2_hint_isTop( hint ) ) 188 hint->csCoord = ADD_INT32( hint->csCoord, 2 * font->darkenY ); 189 190 hint->csCoord = ADD_INT32( hint->csCoord, hintOrigin ); 191 hint->scale = scale; 192 hint->index = indexStemHint; /* index in original stem hint array */ 193 194 /* if original stem hint has been used, use the same position */ 195 if ( hint->flags != 0 && stemHint->used ) 196 { 197 if ( cf2_hint_isTop( hint ) ) 198 hint->dsCoord = stemHint->maxDS; 199 else 200 hint->dsCoord = stemHint->minDS; 201 202 cf2_hint_lock( hint ); 203 } 204 else 205 hint->dsCoord = FT_MulFix( hint->csCoord, scale ); 206 } 207 208 209 /* initialize an invalid hint map element */ 210 static void cf2_hint_initZero(CF2_Hint hint)211 cf2_hint_initZero( CF2_Hint hint ) 212 { 213 FT_ZERO( hint ); 214 } 215 216 217 FT_LOCAL_DEF( FT_Bool ) cf2_hint_isValid(const CF2_Hint hint)218 cf2_hint_isValid( const CF2_Hint hint ) 219 { 220 return FT_BOOL( hint->flags ); 221 } 222 223 224 static FT_Bool cf2_hint_isPair(const CF2_Hint hint)225 cf2_hint_isPair( const CF2_Hint hint ) 226 { 227 return FT_BOOL( hint->flags & ( CF2_PairBottom | CF2_PairTop ) ); 228 } 229 230 231 static FT_Bool cf2_hint_isPairTop(const CF2_Hint hint)232 cf2_hint_isPairTop( const CF2_Hint hint ) 233 { 234 return FT_BOOL( hint->flags & CF2_PairTop ); 235 } 236 237 238 FT_LOCAL_DEF( FT_Bool ) cf2_hint_isTop(const CF2_Hint hint)239 cf2_hint_isTop( const CF2_Hint hint ) 240 { 241 return FT_BOOL( hint->flags & ( CF2_PairTop | CF2_GhostTop ) ); 242 } 243 244 245 FT_LOCAL_DEF( FT_Bool ) cf2_hint_isBottom(const CF2_Hint hint)246 cf2_hint_isBottom( const CF2_Hint hint ) 247 { 248 return FT_BOOL( hint->flags & ( CF2_PairBottom | CF2_GhostBottom ) ); 249 } 250 251 252 static FT_Bool cf2_hint_isLocked(const CF2_Hint hint)253 cf2_hint_isLocked( const CF2_Hint hint ) 254 { 255 return FT_BOOL( hint->flags & CF2_Locked ); 256 } 257 258 259 static FT_Bool cf2_hint_isSynthetic(const CF2_Hint hint)260 cf2_hint_isSynthetic( const CF2_Hint hint ) 261 { 262 return FT_BOOL( hint->flags & CF2_Synthetic ); 263 } 264 265 266 FT_LOCAL_DEF( void ) cf2_hint_lock(CF2_Hint hint)267 cf2_hint_lock( CF2_Hint hint ) 268 { 269 hint->flags |= CF2_Locked; 270 } 271 272 273 FT_LOCAL_DEF( void ) cf2_hintmap_init(CF2_HintMap hintmap,CF2_Font font,CF2_HintMap initialMap,CF2_ArrStack hintMoves,CF2_Fixed scale)274 cf2_hintmap_init( CF2_HintMap hintmap, 275 CF2_Font font, 276 CF2_HintMap initialMap, 277 CF2_ArrStack hintMoves, 278 CF2_Fixed scale ) 279 { 280 FT_ZERO( hintmap ); 281 282 /* copy parameters from font instance */ 283 hintmap->hinted = font->hinted; 284 hintmap->scale = scale; 285 hintmap->font = font; 286 hintmap->initialHintMap = initialMap; 287 /* will clear in `cf2_hintmap_adjustHints' */ 288 hintmap->hintMoves = hintMoves; 289 } 290 291 292 static FT_Bool cf2_hintmap_isValid(const CF2_HintMap hintmap)293 cf2_hintmap_isValid( const CF2_HintMap hintmap ) 294 { 295 return hintmap->isValid; 296 } 297 298 299 static void cf2_hintmap_dump(CF2_HintMap hintmap)300 cf2_hintmap_dump( CF2_HintMap hintmap ) 301 { 302 #ifdef FT_DEBUG_LEVEL_TRACE 303 CF2_UInt i; 304 305 306 FT_TRACE6(( " index csCoord dsCoord scale flags\n" )); 307 308 for ( i = 0; i < hintmap->count; i++ ) 309 { 310 CF2_Hint hint = &hintmap->edge[i]; 311 312 313 FT_TRACE6(( " %3ld %7.2f %7.2f %5d %s%s%s%s\n", 314 hint->index, 315 hint->csCoord / 65536.0, 316 hint->dsCoord / ( hint->scale * 1.0 ), 317 hint->scale, 318 ( cf2_hint_isPair( hint ) ? "p" : "g" ), 319 ( cf2_hint_isTop( hint ) ? "t" : "b" ), 320 ( cf2_hint_isLocked( hint ) ? "L" : ""), 321 ( cf2_hint_isSynthetic( hint ) ? "S" : "" ) )); 322 } 323 #else 324 FT_UNUSED( hintmap ); 325 #endif 326 } 327 328 329 /* transform character space coordinate to device space using hint map */ 330 static CF2_Fixed cf2_hintmap_map(CF2_HintMap hintmap,CF2_Fixed csCoord)331 cf2_hintmap_map( CF2_HintMap hintmap, 332 CF2_Fixed csCoord ) 333 { 334 if ( hintmap->count == 0 || !hintmap->hinted ) 335 { 336 /* there are no hints; use uniform scale and zero offset */ 337 return FT_MulFix( csCoord, hintmap->scale ); 338 } 339 else 340 { 341 /* start linear search from last hit */ 342 CF2_UInt i = hintmap->lastIndex; 343 344 345 FT_ASSERT( hintmap->lastIndex < CF2_MAX_HINT_EDGES ); 346 347 /* search up */ 348 while ( i < hintmap->count - 1 && 349 csCoord >= hintmap->edge[i + 1].csCoord ) 350 i += 1; 351 352 /* search down */ 353 while ( i > 0 && csCoord < hintmap->edge[i].csCoord ) 354 i -= 1; 355 356 hintmap->lastIndex = i; 357 358 if ( i == 0 && csCoord < hintmap->edge[0].csCoord ) 359 { 360 /* special case for points below first edge: use uniform scale */ 361 return ADD_INT32( FT_MulFix( SUB_INT32( csCoord, 362 hintmap->edge[0].csCoord ), 363 hintmap->scale ), 364 hintmap->edge[0].dsCoord ); 365 } 366 else 367 { 368 /* 369 * Note: entries with duplicate csCoord are allowed. 370 * Use edge[i], the highest entry where csCoord >= entry[i].csCoord 371 */ 372 return ADD_INT32( FT_MulFix( SUB_INT32( csCoord, 373 hintmap->edge[i].csCoord ), 374 hintmap->edge[i].scale ), 375 hintmap->edge[i].dsCoord ); 376 } 377 } 378 } 379 380 381 /* 382 * This hinting policy moves a hint pair in device space so that one of 383 * its two edges is on a device pixel boundary (its fractional part is 384 * zero). `cf2_hintmap_insertHint' guarantees no overlap in CS 385 * space. Ensure here that there is no overlap in DS. 386 * 387 * In the first pass, edges are adjusted relative to adjacent hints. 388 * Those that are below have already been adjusted. Those that are 389 * above have not yet been adjusted. If a hint above blocks an 390 * adjustment to an optimal position, we will try again in a second 391 * pass. The second pass is top-down. 392 * 393 */ 394 395 static void cf2_hintmap_adjustHints(CF2_HintMap hintmap)396 cf2_hintmap_adjustHints( CF2_HintMap hintmap ) 397 { 398 size_t i, j; 399 400 401 cf2_arrstack_clear( hintmap->hintMoves ); /* working storage */ 402 403 /* 404 * First pass is bottom-up (font hint order) without look-ahead. 405 * Locked edges are already adjusted. 406 * Unlocked edges begin with dsCoord from `initialHintMap'. 407 * Save edges that are not optimally adjusted in `hintMoves' array, 408 * and process them in second pass. 409 */ 410 411 for ( i = 0; i < hintmap->count; i++ ) 412 { 413 FT_Bool isPair = cf2_hint_isPair( &hintmap->edge[i] ); 414 415 /* final amount to move edge or edge pair */ 416 CF2_Fixed move = 0; 417 418 CF2_Fixed dsCoord_i; 419 CF2_Fixed dsCoord_j; 420 421 422 /* index of upper edge (same value for ghost hint) */ 423 j = isPair ? i + 1 : i; 424 425 FT_ASSERT( j < hintmap->count ); 426 FT_ASSERT( cf2_hint_isValid( &hintmap->edge[i] ) ); 427 FT_ASSERT( cf2_hint_isValid( &hintmap->edge[j] ) ); 428 FT_ASSERT( cf2_hint_isLocked( &hintmap->edge[i] ) == 429 cf2_hint_isLocked( &hintmap->edge[j] ) ); 430 431 dsCoord_i = hintmap->edge[i].dsCoord; 432 dsCoord_j = hintmap->edge[j].dsCoord; 433 434 if ( !cf2_hint_isLocked( &hintmap->edge[i] ) ) 435 { 436 /* hint edge is not locked, we can adjust it */ 437 CF2_Fixed fracDown = cf2_fixedFraction( dsCoord_i ); 438 CF2_Fixed fracUp = cf2_fixedFraction( dsCoord_j ); 439 440 /* calculate all four possibilities; moves down are negative */ 441 CF2_Fixed downMoveDown = 0 - fracDown; 442 CF2_Fixed upMoveDown = 0 - fracUp; 443 CF2_Fixed downMoveUp = ( fracDown == 0 ) 444 ? 0 445 : cf2_intToFixed( 1 ) - fracDown; 446 CF2_Fixed upMoveUp = ( fracUp == 0 ) 447 ? 0 448 : cf2_intToFixed( 1 ) - fracUp; 449 450 /* smallest move up */ 451 CF2_Fixed moveUp = FT_MIN( downMoveUp, upMoveUp ); 452 /* smallest move down */ 453 CF2_Fixed moveDown = FT_MAX( downMoveDown, upMoveDown ); 454 455 CF2_Fixed downMinCounter = CF2_MIN_COUNTER; 456 CF2_Fixed upMinCounter = CF2_MIN_COUNTER; 457 FT_Bool saveEdge = FALSE; 458 459 460 /* minimum counter constraint doesn't apply when adjacent edges */ 461 /* are synthetic */ 462 /* TODO: doesn't seem a big effect; for now, reduce the code */ 463 #if 0 464 if ( i == 0 || 465 cf2_hint_isSynthetic( &hintmap->edge[i - 1] ) ) 466 downMinCounter = 0; 467 468 if ( j >= hintmap->count - 1 || 469 cf2_hint_isSynthetic( &hintmap->edge[j + 1] ) ) 470 upMinCounter = 0; 471 #endif 472 473 /* is there room to move up? */ 474 /* there is if we are at top of array or the next edge is at or */ 475 /* beyond proposed move up? */ 476 if ( j >= hintmap->count - 1 || 477 hintmap->edge[j + 1].dsCoord >= 478 ADD_INT32( dsCoord_j, moveUp + upMinCounter ) ) 479 { 480 /* there is room to move up; is there also room to move down? */ 481 if ( i == 0 || 482 hintmap->edge[i - 1].dsCoord <= 483 ADD_INT32( dsCoord_i, moveDown - downMinCounter ) ) 484 { 485 /* move smaller absolute amount */ 486 move = ( -moveDown < moveUp ) ? moveDown : moveUp; /* optimum */ 487 } 488 else 489 move = moveUp; 490 } 491 else 492 { 493 /* is there room to move down? */ 494 if ( i == 0 || 495 hintmap->edge[i - 1].dsCoord <= 496 ADD_INT32( dsCoord_i, moveDown - downMinCounter ) ) 497 { 498 move = moveDown; 499 /* true if non-optimum move */ 500 saveEdge = FT_BOOL( moveUp < -moveDown ); 501 } 502 else 503 { 504 /* no room to move either way without overlapping or reducing */ 505 /* the counter too much */ 506 move = 0; 507 saveEdge = TRUE; 508 } 509 } 510 511 /* Identify non-moves and moves down that aren't optimal, and save */ 512 /* them for second pass. */ 513 /* Do this only if there is an unlocked edge above (which could */ 514 /* possibly move). */ 515 if ( saveEdge && 516 j < hintmap->count - 1 && 517 !cf2_hint_isLocked( &hintmap->edge[j + 1] ) ) 518 { 519 CF2_HintMoveRec savedMove; 520 521 522 savedMove.j = j; 523 /* desired adjustment in second pass */ 524 savedMove.moveUp = moveUp - move; 525 526 cf2_arrstack_push( hintmap->hintMoves, &savedMove ); 527 } 528 529 /* move the edge(s) */ 530 hintmap->edge[i].dsCoord = ADD_INT32( dsCoord_i, move ); 531 if ( isPair ) 532 hintmap->edge[j].dsCoord = ADD_INT32( dsCoord_j, move ); 533 } 534 535 /* assert there are no overlaps in device space; */ 536 /* ignore tests if there was overflow (that is, if */ 537 /* operands have the same sign but the sum does not) */ 538 FT_ASSERT( i == 0 || 539 ( ( dsCoord_i ^ move ) >= 0 && 540 ( dsCoord_i ^ hintmap->edge[i].dsCoord ) < 0 ) || 541 hintmap->edge[i - 1].dsCoord <= hintmap->edge[i].dsCoord ); 542 FT_ASSERT( i < j || 543 ( ( dsCoord_j ^ move ) >= 0 && 544 ( dsCoord_j ^ hintmap->edge[j].dsCoord ) < 0 ) || 545 hintmap->edge[i].dsCoord <= hintmap->edge[j].dsCoord ); 546 547 /* adjust the scales, avoiding divide by zero */ 548 if ( i > 0 ) 549 { 550 if ( hintmap->edge[i].csCoord != hintmap->edge[i - 1].csCoord ) 551 hintmap->edge[i - 1].scale = 552 FT_DivFix( SUB_INT32( hintmap->edge[i].dsCoord, 553 hintmap->edge[i - 1].dsCoord ), 554 SUB_INT32( hintmap->edge[i].csCoord, 555 hintmap->edge[i - 1].csCoord ) ); 556 } 557 558 if ( isPair ) 559 { 560 if ( hintmap->edge[j].csCoord != hintmap->edge[j - 1].csCoord ) 561 hintmap->edge[j - 1].scale = 562 FT_DivFix( SUB_INT32( hintmap->edge[j].dsCoord, 563 hintmap->edge[j - 1].dsCoord ), 564 SUB_INT32( hintmap->edge[j].csCoord, 565 hintmap->edge[j - 1].csCoord ) ); 566 567 i += 1; /* skip upper edge on next loop */ 568 } 569 } 570 571 /* second pass tries to move non-optimal hints up, in case there is */ 572 /* room now */ 573 for ( i = cf2_arrstack_size( hintmap->hintMoves ); i > 0; i-- ) 574 { 575 CF2_HintMove hintMove = (CF2_HintMove) 576 cf2_arrstack_getPointer( hintmap->hintMoves, i - 1 ); 577 578 579 j = hintMove->j; 580 581 /* this was tested before the push, above */ 582 FT_ASSERT( j < hintmap->count - 1 ); 583 584 /* is there room to move up? */ 585 if ( hintmap->edge[j + 1].dsCoord >= 586 ADD_INT32( hintmap->edge[j].dsCoord, 587 hintMove->moveUp + CF2_MIN_COUNTER ) ) 588 { 589 /* there is more room now, move edge up */ 590 hintmap->edge[j].dsCoord = ADD_INT32( hintmap->edge[j].dsCoord, 591 hintMove->moveUp ); 592 593 if ( cf2_hint_isPair( &hintmap->edge[j] ) ) 594 { 595 FT_ASSERT( j > 0 ); 596 hintmap->edge[j - 1].dsCoord = 597 ADD_INT32( hintmap->edge[j - 1].dsCoord, hintMove->moveUp ); 598 } 599 } 600 } 601 } 602 603 604 /* insert hint edges into map, sorted by csCoord */ 605 static void cf2_hintmap_insertHint(CF2_HintMap hintmap,CF2_Hint bottomHintEdge,CF2_Hint topHintEdge)606 cf2_hintmap_insertHint( CF2_HintMap hintmap, 607 CF2_Hint bottomHintEdge, 608 CF2_Hint topHintEdge ) 609 { 610 CF2_UInt indexInsert; 611 612 /* set default values, then check for edge hints */ 613 FT_Bool isPair = TRUE; 614 CF2_Hint firstHintEdge = bottomHintEdge; 615 CF2_Hint secondHintEdge = topHintEdge; 616 617 618 /* one or none of the input params may be invalid when dealing with */ 619 /* edge hints; at least one edge must be valid */ 620 FT_ASSERT( cf2_hint_isValid( bottomHintEdge ) || 621 cf2_hint_isValid( topHintEdge ) ); 622 623 /* determine how many and which edges to insert */ 624 if ( !cf2_hint_isValid( bottomHintEdge ) ) 625 { 626 /* insert only the top edge */ 627 firstHintEdge = topHintEdge; 628 isPair = FALSE; 629 } 630 else if ( !cf2_hint_isValid( topHintEdge ) ) 631 { 632 /* insert only the bottom edge */ 633 isPair = FALSE; 634 } 635 636 /* paired edges must be in proper order */ 637 if ( isPair && 638 topHintEdge->csCoord < bottomHintEdge->csCoord ) 639 return; 640 641 /* linear search to find index value of insertion point */ 642 indexInsert = 0; 643 for ( ; indexInsert < hintmap->count; indexInsert++ ) 644 { 645 if ( hintmap->edge[indexInsert].csCoord >= firstHintEdge->csCoord ) 646 break; 647 } 648 649 FT_TRACE7(( " Got hint at %.2f (%.2f)\n", 650 firstHintEdge->csCoord / 65536.0, 651 firstHintEdge->dsCoord / 65536.0 )); 652 if ( isPair ) 653 FT_TRACE7(( " Got hint at %.2f (%.2f)\n", 654 secondHintEdge->csCoord / 65536.0, 655 secondHintEdge->dsCoord / 65536.0 )); 656 657 /* 658 * Discard any hints that overlap in character space. Most often, this 659 * is while building the initial map, where captured hints from all 660 * zones are combined. Define overlap to include hints that `touch' 661 * (overlap zero). Hiragino Sans/Gothic fonts have numerous hints that 662 * touch. Some fonts have non-ideographic glyphs that overlap our 663 * synthetic hints. 664 * 665 * Overlap also occurs when darkening stem hints that are close. 666 * 667 */ 668 if ( indexInsert < hintmap->count ) 669 { 670 /* we are inserting before an existing edge: */ 671 /* verify that an existing edge is not the same */ 672 if ( hintmap->edge[indexInsert].csCoord == firstHintEdge->csCoord ) 673 return; /* ignore overlapping stem hint */ 674 675 /* verify that a new pair does not straddle the next edge */ 676 if ( isPair && 677 hintmap->edge[indexInsert].csCoord <= secondHintEdge->csCoord ) 678 return; /* ignore overlapping stem hint */ 679 680 /* verify that we are not inserting between paired edges */ 681 if ( cf2_hint_isPairTop( &hintmap->edge[indexInsert] ) ) 682 return; /* ignore overlapping stem hint */ 683 } 684 685 /* recompute device space locations using initial hint map */ 686 if ( cf2_hintmap_isValid( hintmap->initialHintMap ) && 687 !cf2_hint_isLocked( firstHintEdge ) ) 688 { 689 if ( isPair ) 690 { 691 /* Use hint map to position the center of stem, and nominal scale */ 692 /* to position the two edges. This preserves the stem width. */ 693 CF2_Fixed midpoint = 694 cf2_hintmap_map( 695 hintmap->initialHintMap, 696 ADD_INT32( secondHintEdge->csCoord, 697 firstHintEdge->csCoord ) / 2 ); 698 CF2_Fixed halfWidth = 699 FT_MulFix( SUB_INT32( secondHintEdge->csCoord, 700 firstHintEdge->csCoord ) / 2, 701 hintmap->scale ); 702 703 704 firstHintEdge->dsCoord = SUB_INT32( midpoint, halfWidth ); 705 secondHintEdge->dsCoord = ADD_INT32( midpoint, halfWidth ); 706 } 707 else 708 firstHintEdge->dsCoord = cf2_hintmap_map( hintmap->initialHintMap, 709 firstHintEdge->csCoord ); 710 } 711 712 /* 713 * Discard any hints that overlap in device space; this can occur 714 * because locked hints have been moved to align with blue zones. 715 * 716 * TODO: Although we might correct this later during adjustment, we 717 * don't currently have a way to delete a conflicting hint once it has 718 * been inserted. See v2.030 MinionPro-Regular, 12 ppem darkened, 719 * initial hint map for second path, glyph 945 (the perispomeni (tilde) 720 * in U+1F6E, Greek omega with psili and perispomeni). Darkening is 721 * 25. Pair 667,747 initially conflicts in design space with top edge 722 * 660. This is because 667 maps to 7.87, and the top edge was 723 * captured by a zone at 8.0. The pair is later successfully inserted 724 * in a zone without the top edge. In this zone it is adjusted to 8.0, 725 * and no longer conflicts with the top edge in design space. This 726 * means it can be included in yet a later zone which does have the top 727 * edge hint. This produces a small mismatch between the first and 728 * last points of this path, even though the hint masks are the same. 729 * The density map difference is tiny (1/256). 730 * 731 */ 732 733 if ( indexInsert > 0 ) 734 { 735 /* we are inserting after an existing edge */ 736 if ( firstHintEdge->dsCoord < hintmap->edge[indexInsert - 1].dsCoord ) 737 return; 738 } 739 740 if ( indexInsert < hintmap->count ) 741 { 742 /* we are inserting before an existing edge */ 743 if ( isPair ) 744 { 745 if ( secondHintEdge->dsCoord > hintmap->edge[indexInsert].dsCoord ) 746 return; 747 } 748 else 749 { 750 if ( firstHintEdge->dsCoord > hintmap->edge[indexInsert].dsCoord ) 751 return; 752 } 753 } 754 755 /* make room to insert */ 756 { 757 CF2_UInt iSrc = hintmap->count - 1; 758 CF2_UInt iDst = isPair ? hintmap->count + 1 : hintmap->count; 759 760 CF2_UInt count = hintmap->count - indexInsert; 761 762 763 if ( iDst >= CF2_MAX_HINT_EDGES ) 764 { 765 FT_TRACE4(( "cf2_hintmap_insertHint: too many hintmaps\n" )); 766 return; 767 } 768 769 while ( count-- ) 770 hintmap->edge[iDst--] = hintmap->edge[iSrc--]; 771 772 /* insert first edge */ 773 hintmap->edge[indexInsert] = *firstHintEdge; /* copy struct */ 774 hintmap->count += 1; 775 776 FT_TRACE7(( " Inserting hint %.2f (%.2f)\n", 777 firstHintEdge->csCoord / 65536.0, 778 firstHintEdge->dsCoord / 65536.0 )); 779 780 if ( isPair ) 781 { 782 /* insert second edge */ 783 hintmap->edge[indexInsert + 1] = *secondHintEdge; /* copy struct */ 784 hintmap->count += 1; 785 786 FT_TRACE7(( " Inserting hint %.2f (%.2f)\n", 787 secondHintEdge->csCoord / 65536.0, 788 secondHintEdge->dsCoord / 65536.0 )); 789 790 } 791 } 792 793 return; 794 } 795 796 797 /* 798 * Build a map from hints and mask. 799 * 800 * This function may recur one level if `hintmap->initialHintMap' is not yet 801 * valid. 802 * If `initialMap' is true, simply build initial map. 803 * 804 * Synthetic hints are used in two ways. A hint at zero is inserted, if 805 * needed, in the initial hint map, to prevent translations from 806 * propagating across the origin. If synthetic em box hints are enabled 807 * for ideographic dictionaries, then they are inserted in all hint 808 * maps, including the initial one. 809 * 810 */ 811 FT_LOCAL_DEF( void ) cf2_hintmap_build(CF2_HintMap hintmap,CF2_ArrStack hStemHintArray,CF2_ArrStack vStemHintArray,CF2_HintMask hintMask,CF2_Fixed hintOrigin,FT_Bool initialMap)812 cf2_hintmap_build( CF2_HintMap hintmap, 813 CF2_ArrStack hStemHintArray, 814 CF2_ArrStack vStemHintArray, 815 CF2_HintMask hintMask, 816 CF2_Fixed hintOrigin, 817 FT_Bool initialMap ) 818 { 819 FT_Byte* maskPtr; 820 821 CF2_Font font = hintmap->font; 822 CF2_HintMaskRec tempHintMask; 823 824 size_t bitCount, i; 825 FT_Byte maskByte; 826 827 828 /* check whether initial map is constructed */ 829 if ( !initialMap && !cf2_hintmap_isValid( hintmap->initialHintMap ) ) 830 { 831 /* make recursive call with initialHintMap and temporary mask; */ 832 /* temporary mask will get all bits set, below */ 833 cf2_hintmask_init( &tempHintMask, hintMask->error ); 834 cf2_hintmap_build( hintmap->initialHintMap, 835 hStemHintArray, 836 vStemHintArray, 837 &tempHintMask, 838 hintOrigin, 839 TRUE ); 840 } 841 842 if ( !cf2_hintmask_isValid( hintMask ) ) 843 { 844 /* without a hint mask, assume all hints are active */ 845 cf2_hintmask_setAll( hintMask, 846 cf2_arrstack_size( hStemHintArray ) + 847 cf2_arrstack_size( vStemHintArray ) ); 848 if ( !cf2_hintmask_isValid( hintMask ) ) 849 { 850 if ( font->isT1 ) 851 { 852 /* no error, just continue unhinted */ 853 *hintMask->error = FT_Err_Ok; 854 hintmap->hinted = FALSE; 855 } 856 return; /* too many stem hints */ 857 } 858 } 859 860 /* begin by clearing the map */ 861 hintmap->count = 0; 862 hintmap->lastIndex = 0; 863 864 /* make a copy of the hint mask so we can modify it */ 865 tempHintMask = *hintMask; 866 maskPtr = cf2_hintmask_getMaskPtr( &tempHintMask ); 867 868 /* use the hStem hints only, which are first in the mask */ 869 bitCount = cf2_arrstack_size( hStemHintArray ); 870 871 /* Defense-in-depth. Should never return here. */ 872 if ( bitCount > hintMask->bitCount ) 873 return; 874 875 /* synthetic embox hints get highest priority */ 876 if ( font->blues.doEmBoxHints ) 877 { 878 CF2_HintRec dummy; 879 880 881 cf2_hint_initZero( &dummy ); /* invalid hint map element */ 882 883 /* ghost bottom */ 884 cf2_hintmap_insertHint( hintmap, 885 &font->blues.emBoxBottomEdge, 886 &dummy ); 887 /* ghost top */ 888 cf2_hintmap_insertHint( hintmap, 889 &dummy, 890 &font->blues.emBoxTopEdge ); 891 } 892 893 /* insert hints captured by a blue zone or already locked (higher */ 894 /* priority) */ 895 for ( i = 0, maskByte = 0x80; i < bitCount; i++ ) 896 { 897 if ( maskByte & *maskPtr ) 898 { 899 /* expand StemHint into two `CF2_Hint' elements */ 900 CF2_HintRec bottomHintEdge, topHintEdge; 901 902 903 cf2_hint_init( &bottomHintEdge, 904 hStemHintArray, 905 i, 906 font, 907 hintOrigin, 908 hintmap->scale, 909 TRUE /* bottom */ ); 910 cf2_hint_init( &topHintEdge, 911 hStemHintArray, 912 i, 913 font, 914 hintOrigin, 915 hintmap->scale, 916 FALSE /* top */ ); 917 918 if ( cf2_hint_isLocked( &bottomHintEdge ) || 919 cf2_hint_isLocked( &topHintEdge ) || 920 cf2_blues_capture( &font->blues, 921 &bottomHintEdge, 922 &topHintEdge ) ) 923 { 924 /* insert captured hint into map */ 925 cf2_hintmap_insertHint( hintmap, &bottomHintEdge, &topHintEdge ); 926 927 *maskPtr &= ~maskByte; /* turn off the bit for this hint */ 928 } 929 } 930 931 if ( ( i & 7 ) == 7 ) 932 { 933 /* move to next mask byte */ 934 maskPtr++; 935 maskByte = 0x80; 936 } 937 else 938 maskByte >>= 1; 939 } 940 941 /* initial hint map includes only captured hints plus maybe one at 0 */ 942 943 /* 944 * TODO: There is a problem here because we are trying to build a 945 * single hint map containing all captured hints. It is 946 * possible for there to be conflicts between captured hints, 947 * either because of darkening or because the hints are in 948 * separate hint zones (we are ignoring hint zones for the 949 * initial map). An example of the latter is MinionPro-Regular 950 * v2.030 glyph 883 (Greek Capital Alpha with Psili) at 15ppem. 951 * A stem hint for the psili conflicts with the top edge hint 952 * for the base character. The stem hint gets priority because 953 * of its sort order. In glyph 884 (Greek Capital Alpha with 954 * Psili and Oxia), the top of the base character gets a stem 955 * hint, and the psili does not. This creates different initial 956 * maps for the two glyphs resulting in different renderings of 957 * the base character. Will probably defer this either as not 958 * worth the cost or as a font bug. I don't think there is any 959 * good reason for an accent to be captured by an alignment 960 * zone. -darnold 2/12/10 961 */ 962 963 if ( initialMap ) 964 { 965 /* Apply a heuristic that inserts a point for (0,0), unless it's */ 966 /* already covered by a mapping. This locks the baseline for glyphs */ 967 /* that have no baseline hints. */ 968 969 if ( hintmap->count == 0 || 970 hintmap->edge[0].csCoord > 0 || 971 hintmap->edge[hintmap->count - 1].csCoord < 0 ) 972 { 973 /* all edges are above 0 or all edges are below 0; */ 974 /* construct a locked edge hint at 0 */ 975 976 CF2_HintRec edge, invalid; 977 978 979 cf2_hint_initZero( &edge ); 980 981 edge.flags = CF2_GhostBottom | 982 CF2_Locked | 983 CF2_Synthetic; 984 edge.scale = hintmap->scale; 985 986 cf2_hint_initZero( &invalid ); 987 cf2_hintmap_insertHint( hintmap, &edge, &invalid ); 988 } 989 } 990 else 991 { 992 /* insert remaining hints */ 993 994 maskPtr = cf2_hintmask_getMaskPtr( &tempHintMask ); 995 996 for ( i = 0, maskByte = 0x80; i < bitCount; i++ ) 997 { 998 if ( maskByte & *maskPtr ) 999 { 1000 CF2_HintRec bottomHintEdge, topHintEdge; 1001 1002 1003 cf2_hint_init( &bottomHintEdge, 1004 hStemHintArray, 1005 i, 1006 font, 1007 hintOrigin, 1008 hintmap->scale, 1009 TRUE /* bottom */ ); 1010 cf2_hint_init( &topHintEdge, 1011 hStemHintArray, 1012 i, 1013 font, 1014 hintOrigin, 1015 hintmap->scale, 1016 FALSE /* top */ ); 1017 1018 cf2_hintmap_insertHint( hintmap, &bottomHintEdge, &topHintEdge ); 1019 } 1020 1021 if ( ( i & 7 ) == 7 ) 1022 { 1023 /* move to next mask byte */ 1024 maskPtr++; 1025 maskByte = 0x80; 1026 } 1027 else 1028 maskByte >>= 1; 1029 } 1030 } 1031 1032 #ifdef FT_DEBUG_LEVEL_TRACE 1033 if ( initialMap ) 1034 { 1035 FT_TRACE6(( "flags: [p]air [g]host [t]op" 1036 " [b]ottom [L]ocked [S]ynthetic\n" )); 1037 FT_TRACE6(( "Initial hintmap" )); 1038 } 1039 else 1040 FT_TRACE6(( "Hints:" )); 1041 #endif 1042 1043 cf2_hintmap_dump( hintmap ); 1044 1045 /* 1046 * Note: The following line is a convenient place to break when 1047 * debugging hinting. Examine `hintmap->edge' for the list of 1048 * enabled hints, then step over the call to see the effect of 1049 * adjustment. We stop here first on the recursive call that 1050 * creates the initial map, and then on each counter group and 1051 * hint zone. 1052 */ 1053 1054 /* adjust positions of hint edges that are not locked to blue zones */ 1055 cf2_hintmap_adjustHints( hintmap ); 1056 1057 FT_TRACE6(( "(adjusted)\n" )); 1058 cf2_hintmap_dump( hintmap ); 1059 1060 /* save the position of all hints that were used in this hint map; */ 1061 /* if we use them again, we'll locate them in the same position */ 1062 if ( !initialMap ) 1063 { 1064 for ( i = 0; i < hintmap->count; i++ ) 1065 { 1066 if ( !cf2_hint_isSynthetic( &hintmap->edge[i] ) ) 1067 { 1068 /* Note: include both valid and invalid edges */ 1069 /* Note: top and bottom edges are copied back separately */ 1070 CF2_StemHint stemhint = (CF2_StemHint) 1071 cf2_arrstack_getPointer( hStemHintArray, 1072 hintmap->edge[i].index ); 1073 1074 1075 if ( cf2_hint_isTop( &hintmap->edge[i] ) ) 1076 stemhint->maxDS = hintmap->edge[i].dsCoord; 1077 else 1078 stemhint->minDS = hintmap->edge[i].dsCoord; 1079 1080 stemhint->used = TRUE; 1081 } 1082 } 1083 } 1084 1085 /* hint map is ready to use */ 1086 hintmap->isValid = TRUE; 1087 1088 /* remember this mask has been used */ 1089 cf2_hintmask_setNew( hintMask, FALSE ); 1090 } 1091 1092 1093 FT_LOCAL_DEF( void ) cf2_glyphpath_init(CF2_GlyphPath glyphpath,CF2_Font font,CF2_OutlineCallbacks callbacks,CF2_Fixed scaleY,CF2_ArrStack hStemHintArray,CF2_ArrStack vStemHintArray,CF2_HintMask hintMask,CF2_Fixed hintOriginY,const CF2_Blues blues,const FT_Vector * fractionalTranslation)1094 cf2_glyphpath_init( CF2_GlyphPath glyphpath, 1095 CF2_Font font, 1096 CF2_OutlineCallbacks callbacks, 1097 CF2_Fixed scaleY, 1098 /* CF2_Fixed hShift, */ 1099 CF2_ArrStack hStemHintArray, 1100 CF2_ArrStack vStemHintArray, 1101 CF2_HintMask hintMask, 1102 CF2_Fixed hintOriginY, 1103 const CF2_Blues blues, 1104 const FT_Vector* fractionalTranslation ) 1105 { 1106 FT_ZERO( glyphpath ); 1107 1108 glyphpath->font = font; 1109 glyphpath->callbacks = callbacks; 1110 1111 cf2_arrstack_init( &glyphpath->hintMoves, 1112 font->memory, 1113 &font->error, 1114 sizeof ( CF2_HintMoveRec ) ); 1115 1116 cf2_hintmap_init( &glyphpath->initialHintMap, 1117 font, 1118 &glyphpath->initialHintMap, 1119 &glyphpath->hintMoves, 1120 scaleY ); 1121 cf2_hintmap_init( &glyphpath->firstHintMap, 1122 font, 1123 &glyphpath->initialHintMap, 1124 &glyphpath->hintMoves, 1125 scaleY ); 1126 cf2_hintmap_init( &glyphpath->hintMap, 1127 font, 1128 &glyphpath->initialHintMap, 1129 &glyphpath->hintMoves, 1130 scaleY ); 1131 1132 glyphpath->scaleX = font->innerTransform.a; 1133 glyphpath->scaleC = font->innerTransform.c; 1134 glyphpath->scaleY = font->innerTransform.d; 1135 1136 glyphpath->fractionalTranslation = *fractionalTranslation; 1137 1138 #if 0 1139 glyphpath->hShift = hShift; /* for fauxing */ 1140 #endif 1141 1142 glyphpath->hStemHintArray = hStemHintArray; 1143 glyphpath->vStemHintArray = vStemHintArray; 1144 glyphpath->hintMask = hintMask; /* ptr to current mask */ 1145 glyphpath->hintOriginY = hintOriginY; 1146 glyphpath->blues = blues; 1147 glyphpath->darken = font->darkened; /* TODO: should we make copies? */ 1148 glyphpath->xOffset = font->darkenX; 1149 glyphpath->yOffset = font->darkenY; 1150 glyphpath->miterLimit = 2 * FT_MAX( 1151 cf2_fixedAbs( glyphpath->xOffset ), 1152 cf2_fixedAbs( glyphpath->yOffset ) ); 1153 1154 /* .1 character space unit */ 1155 glyphpath->snapThreshold = cf2_doubleToFixed( 0.1 ); 1156 1157 glyphpath->moveIsPending = TRUE; 1158 glyphpath->pathIsOpen = FALSE; 1159 glyphpath->pathIsClosing = FALSE; 1160 glyphpath->elemIsQueued = FALSE; 1161 } 1162 1163 1164 FT_LOCAL_DEF( void ) cf2_glyphpath_finalize(CF2_GlyphPath glyphpath)1165 cf2_glyphpath_finalize( CF2_GlyphPath glyphpath ) 1166 { 1167 cf2_arrstack_finalize( &glyphpath->hintMoves ); 1168 } 1169 1170 1171 /* 1172 * Hint point in y-direction and apply outerTransform. 1173 * Input `current' hint map (which is actually delayed by one element). 1174 * Input x,y point in Character Space. 1175 * Output x,y point in Device Space, including translation. 1176 */ 1177 static void cf2_glyphpath_hintPoint(CF2_GlyphPath glyphpath,CF2_HintMap hintmap,FT_Vector * ppt,CF2_Fixed x,CF2_Fixed y)1178 cf2_glyphpath_hintPoint( CF2_GlyphPath glyphpath, 1179 CF2_HintMap hintmap, 1180 FT_Vector* ppt, 1181 CF2_Fixed x, 1182 CF2_Fixed y ) 1183 { 1184 FT_Vector pt; /* hinted point in upright DS */ 1185 1186 1187 pt.x = ADD_INT32( FT_MulFix( glyphpath->scaleX, x ), 1188 FT_MulFix( glyphpath->scaleC, y ) ); 1189 pt.y = cf2_hintmap_map( hintmap, y ); 1190 1191 ppt->x = ADD_INT32( 1192 FT_MulFix( glyphpath->font->outerTransform.a, pt.x ), 1193 ADD_INT32( 1194 FT_MulFix( glyphpath->font->outerTransform.c, pt.y ), 1195 glyphpath->fractionalTranslation.x ) ); 1196 ppt->y = ADD_INT32( 1197 FT_MulFix( glyphpath->font->outerTransform.b, pt.x ), 1198 ADD_INT32( 1199 FT_MulFix( glyphpath->font->outerTransform.d, pt.y ), 1200 glyphpath->fractionalTranslation.y ) ); 1201 } 1202 1203 1204 /* 1205 * From two line segments, (u1,u2) and (v1,v2), compute a point of 1206 * intersection on the corresponding lines. 1207 * Return false if no intersection is found, or if the intersection is 1208 * too far away from the ends of the line segments, u2 and v1. 1209 * 1210 */ 1211 static FT_Bool cf2_glyphpath_computeIntersection(CF2_GlyphPath glyphpath,const FT_Vector * u1,const FT_Vector * u2,const FT_Vector * v1,const FT_Vector * v2,FT_Vector * intersection)1212 cf2_glyphpath_computeIntersection( CF2_GlyphPath glyphpath, 1213 const FT_Vector* u1, 1214 const FT_Vector* u2, 1215 const FT_Vector* v1, 1216 const FT_Vector* v2, 1217 FT_Vector* intersection ) 1218 { 1219 /* 1220 * Let `u' be a zero-based vector from the first segment, `v' from the 1221 * second segment. 1222 * Let `w 'be the zero-based vector from `u1' to `v1'. 1223 * `perp' is the `perpendicular dot product'; see 1224 * https://mathworld.wolfram.com/PerpDotProduct.html. 1225 * `s' is the parameter for the parametric line for the first segment 1226 * (`u'). 1227 * 1228 * See notation in 1229 * http://geomalgorithms.com/a05-_intersect-1.html. 1230 * Calculations are done in 16.16, but must handle the squaring of 1231 * line lengths in character space. We scale all vectors by 1/32 to 1232 * avoid overflow. This allows values up to 4095 to be squared. The 1233 * scale factor cancels in the divide. 1234 * 1235 * TODO: the scale factor could be computed from UnitsPerEm. 1236 * 1237 */ 1238 1239 #define cf2_perp( a, b ) \ 1240 ( FT_MulFix( a.x, b.y ) - FT_MulFix( a.y, b.x ) ) 1241 1242 /* round and divide by 32 */ 1243 #define CF2_CS_SCALE( x ) \ 1244 ( ( (x) + 0x10 ) >> 5 ) 1245 1246 FT_Vector u, v, w; /* scaled vectors */ 1247 CF2_Fixed denominator, s; 1248 1249 1250 u.x = CF2_CS_SCALE( SUB_INT32( u2->x, u1->x ) ); 1251 u.y = CF2_CS_SCALE( SUB_INT32( u2->y, u1->y ) ); 1252 v.x = CF2_CS_SCALE( SUB_INT32( v2->x, v1->x ) ); 1253 v.y = CF2_CS_SCALE( SUB_INT32( v2->y, v1->y ) ); 1254 w.x = CF2_CS_SCALE( SUB_INT32( v1->x, u1->x ) ); 1255 w.y = CF2_CS_SCALE( SUB_INT32( v1->y, u1->y ) ); 1256 1257 denominator = cf2_perp( u, v ); 1258 1259 if ( denominator == 0 ) 1260 return FALSE; /* parallel or coincident lines */ 1261 1262 s = FT_DivFix( cf2_perp( w, v ), denominator ); 1263 1264 intersection->x = ADD_INT32( u1->x, 1265 FT_MulFix( s, SUB_INT32( u2->x, u1->x ) ) ); 1266 intersection->y = ADD_INT32( u1->y, 1267 FT_MulFix( s, SUB_INT32( u2->y, u1->y ) ) ); 1268 1269 1270 /* 1271 * Special case snapping for horizontal and vertical lines. 1272 * This cleans up intersections and reduces problems with winding 1273 * order detection. 1274 * Sample case is sbc cd KozGoPr6N-Medium.otf 20 16685. 1275 * Note: these calculations are in character space. 1276 * 1277 */ 1278 1279 if ( u1->x == u2->x && 1280 cf2_fixedAbs( SUB_INT32( intersection->x, 1281 u1->x ) ) < glyphpath->snapThreshold ) 1282 intersection->x = u1->x; 1283 if ( u1->y == u2->y && 1284 cf2_fixedAbs( SUB_INT32( intersection->y, 1285 u1->y ) ) < glyphpath->snapThreshold ) 1286 intersection->y = u1->y; 1287 1288 if ( v1->x == v2->x && 1289 cf2_fixedAbs( SUB_INT32( intersection->x, 1290 v1->x ) ) < glyphpath->snapThreshold ) 1291 intersection->x = v1->x; 1292 if ( v1->y == v2->y && 1293 cf2_fixedAbs( SUB_INT32( intersection->y, 1294 v1->y ) ) < glyphpath->snapThreshold ) 1295 intersection->y = v1->y; 1296 1297 /* limit the intersection distance from midpoint of u2 and v1 */ 1298 if ( cf2_fixedAbs( intersection->x - ADD_INT32( u2->x, v1->x ) / 2 ) > 1299 glyphpath->miterLimit || 1300 cf2_fixedAbs( intersection->y - ADD_INT32( u2->y, v1->y ) / 2 ) > 1301 glyphpath->miterLimit ) 1302 return FALSE; 1303 1304 return TRUE; 1305 } 1306 1307 1308 /* 1309 * Push the cached element (glyphpath->prevElem*) to the outline 1310 * consumer. When a darkening offset is used, the end point of the 1311 * cached element may be adjusted to an intersection point or we may 1312 * synthesize a connecting line to the current element. If we are 1313 * closing a subpath, we may also generate a connecting line to the start 1314 * point. 1315 * 1316 * This is where Character Space (CS) is converted to Device Space (DS) 1317 * using a hint map. This calculation must use a HintMap that was valid 1318 * at the time the element was saved. For the first point in a subpath, 1319 * that is a saved HintMap. For most elements, it just means the caller 1320 * has delayed building a HintMap from the current HintMask. 1321 * 1322 * Transform each point with outerTransform and call the outline 1323 * callbacks. This is a general 3x3 transform: 1324 * 1325 * x' = a*x + c*y + tx, y' = b*x + d*y + ty 1326 * 1327 * but it uses 4 elements from CF2_Font and the translation part 1328 * from CF2_GlyphPath. 1329 * 1330 */ 1331 static void cf2_glyphpath_pushPrevElem(CF2_GlyphPath glyphpath,CF2_HintMap hintmap,FT_Vector * nextP0,FT_Vector nextP1,FT_Bool close)1332 cf2_glyphpath_pushPrevElem( CF2_GlyphPath glyphpath, 1333 CF2_HintMap hintmap, 1334 FT_Vector* nextP0, 1335 FT_Vector nextP1, 1336 FT_Bool close ) 1337 { 1338 CF2_CallbackParamsRec params; 1339 1340 FT_Vector* prevP0; 1341 FT_Vector* prevP1; 1342 1343 FT_Vector intersection = { 0, 0 }; 1344 FT_Bool useIntersection = FALSE; 1345 1346 1347 FT_ASSERT( glyphpath->prevElemOp == CF2_PathOpLineTo || 1348 glyphpath->prevElemOp == CF2_PathOpCubeTo ); 1349 1350 if ( glyphpath->prevElemOp == CF2_PathOpLineTo ) 1351 { 1352 prevP0 = &glyphpath->prevElemP0; 1353 prevP1 = &glyphpath->prevElemP1; 1354 } 1355 else 1356 { 1357 prevP0 = &glyphpath->prevElemP2; 1358 prevP1 = &glyphpath->prevElemP3; 1359 } 1360 1361 /* optimization: if previous and next elements are offset by the same */ 1362 /* amount, then there will be no gap, and no need to compute an */ 1363 /* intersection. */ 1364 if ( prevP1->x != nextP0->x || prevP1->y != nextP0->y ) 1365 { 1366 /* previous element does not join next element: */ 1367 /* adjust end point of previous element to the intersection */ 1368 useIntersection = cf2_glyphpath_computeIntersection( glyphpath, 1369 prevP0, 1370 prevP1, 1371 nextP0, 1372 &nextP1, 1373 &intersection ); 1374 if ( useIntersection ) 1375 { 1376 /* modify the last point of the cached element (either line or */ 1377 /* curve) */ 1378 *prevP1 = intersection; 1379 } 1380 } 1381 1382 params.pt0 = glyphpath->currentDS; 1383 1384 switch( glyphpath->prevElemOp ) 1385 { 1386 case CF2_PathOpLineTo: 1387 params.op = CF2_PathOpLineTo; 1388 1389 /* note: pt2 and pt3 are unused */ 1390 1391 if ( close ) 1392 { 1393 /* use first hint map if closing */ 1394 cf2_glyphpath_hintPoint( glyphpath, 1395 &glyphpath->firstHintMap, 1396 ¶ms.pt1, 1397 glyphpath->prevElemP1.x, 1398 glyphpath->prevElemP1.y ); 1399 } 1400 else 1401 { 1402 cf2_glyphpath_hintPoint( glyphpath, 1403 hintmap, 1404 ¶ms.pt1, 1405 glyphpath->prevElemP1.x, 1406 glyphpath->prevElemP1.y ); 1407 } 1408 1409 /* output only non-zero length lines */ 1410 if ( params.pt0.x != params.pt1.x || params.pt0.y != params.pt1.y ) 1411 { 1412 glyphpath->callbacks->lineTo( glyphpath->callbacks, ¶ms ); 1413 1414 glyphpath->currentDS = params.pt1; 1415 } 1416 break; 1417 1418 case CF2_PathOpCubeTo: 1419 params.op = CF2_PathOpCubeTo; 1420 1421 /* TODO: should we intersect the interior joins (p1-p2 and p2-p3)? */ 1422 cf2_glyphpath_hintPoint( glyphpath, 1423 hintmap, 1424 ¶ms.pt1, 1425 glyphpath->prevElemP1.x, 1426 glyphpath->prevElemP1.y ); 1427 cf2_glyphpath_hintPoint( glyphpath, 1428 hintmap, 1429 ¶ms.pt2, 1430 glyphpath->prevElemP2.x, 1431 glyphpath->prevElemP2.y ); 1432 cf2_glyphpath_hintPoint( glyphpath, 1433 hintmap, 1434 ¶ms.pt3, 1435 glyphpath->prevElemP3.x, 1436 glyphpath->prevElemP3.y ); 1437 1438 glyphpath->callbacks->cubeTo( glyphpath->callbacks, ¶ms ); 1439 1440 glyphpath->currentDS = params.pt3; 1441 1442 break; 1443 } 1444 1445 if ( !useIntersection || close ) 1446 { 1447 /* insert connecting line between end of previous element and start */ 1448 /* of current one */ 1449 /* note: at the end of a subpath, we might do both, so use `nextP0' */ 1450 /* before we change it, below */ 1451 1452 if ( close ) 1453 { 1454 /* if we are closing the subpath, then nextP0 is in the first */ 1455 /* hint zone */ 1456 cf2_glyphpath_hintPoint( glyphpath, 1457 &glyphpath->firstHintMap, 1458 ¶ms.pt1, 1459 nextP0->x, 1460 nextP0->y ); 1461 } 1462 else 1463 { 1464 cf2_glyphpath_hintPoint( glyphpath, 1465 hintmap, 1466 ¶ms.pt1, 1467 nextP0->x, 1468 nextP0->y ); 1469 } 1470 1471 if ( params.pt1.x != glyphpath->currentDS.x || 1472 params.pt1.y != glyphpath->currentDS.y ) 1473 { 1474 /* length is nonzero */ 1475 params.op = CF2_PathOpLineTo; 1476 params.pt0 = glyphpath->currentDS; 1477 1478 /* note: pt2 and pt3 are unused */ 1479 glyphpath->callbacks->lineTo( glyphpath->callbacks, ¶ms ); 1480 1481 glyphpath->currentDS = params.pt1; 1482 } 1483 } 1484 1485 if ( useIntersection ) 1486 { 1487 /* return intersection point to caller */ 1488 *nextP0 = intersection; 1489 } 1490 } 1491 1492 1493 /* push a MoveTo element based on current point and offset of current */ 1494 /* element */ 1495 static void cf2_glyphpath_pushMove(CF2_GlyphPath glyphpath,FT_Vector start)1496 cf2_glyphpath_pushMove( CF2_GlyphPath glyphpath, 1497 FT_Vector start ) 1498 { 1499 CF2_CallbackParamsRec params; 1500 1501 1502 params.op = CF2_PathOpMoveTo; 1503 params.pt0 = glyphpath->currentDS; 1504 1505 /* Test if move has really happened yet; it would have called */ 1506 /* `cf2_hintmap_build' to set `isValid'. */ 1507 if ( !cf2_hintmap_isValid( &glyphpath->hintMap ) ) 1508 { 1509 /* we are here iff first subpath is missing a moveto operator: */ 1510 /* synthesize first moveTo to finish initialization of hintMap */ 1511 cf2_glyphpath_moveTo( glyphpath, 1512 glyphpath->start.x, 1513 glyphpath->start.y ); 1514 } 1515 1516 cf2_glyphpath_hintPoint( glyphpath, 1517 &glyphpath->hintMap, 1518 ¶ms.pt1, 1519 start.x, 1520 start.y ); 1521 1522 /* note: pt2 and pt3 are unused */ 1523 glyphpath->callbacks->moveTo( glyphpath->callbacks, ¶ms ); 1524 1525 glyphpath->currentDS = params.pt1; 1526 glyphpath->offsetStart0 = start; 1527 } 1528 1529 1530 /* 1531 * All coordinates are in character space. 1532 * On input, (x1, y1) and (x2, y2) give line segment. 1533 * On output, (x, y) give offset vector. 1534 * We use a piecewise approximation to trig functions. 1535 * 1536 * TODO: Offset true perpendicular and proper length 1537 * supply the y-translation for hinting here, too, 1538 * that adds yOffset unconditionally to *y. 1539 */ 1540 static void cf2_glyphpath_computeOffset(CF2_GlyphPath glyphpath,CF2_Fixed x1,CF2_Fixed y1,CF2_Fixed x2,CF2_Fixed y2,CF2_Fixed * x,CF2_Fixed * y)1541 cf2_glyphpath_computeOffset( CF2_GlyphPath glyphpath, 1542 CF2_Fixed x1, 1543 CF2_Fixed y1, 1544 CF2_Fixed x2, 1545 CF2_Fixed y2, 1546 CF2_Fixed* x, 1547 CF2_Fixed* y ) 1548 { 1549 CF2_Fixed dx = SUB_INT32( x2, x1 ); 1550 CF2_Fixed dy = SUB_INT32( y2, y1 ); 1551 1552 1553 /* note: negative offsets don't work here; negate deltas to change */ 1554 /* quadrants, below */ 1555 if ( glyphpath->font->reverseWinding ) 1556 { 1557 dx = NEG_INT32( dx ); 1558 dy = NEG_INT32( dy ); 1559 } 1560 1561 *x = *y = 0; 1562 1563 if ( !glyphpath->darken ) 1564 return; 1565 1566 /* add momentum for this path element */ 1567 glyphpath->callbacks->windingMomentum = 1568 ADD_INT32( glyphpath->callbacks->windingMomentum, 1569 cf2_getWindingMomentum( x1, y1, x2, y2 ) ); 1570 1571 /* note: allow mixed integer and fixed multiplication here */ 1572 if ( dx >= 0 ) 1573 { 1574 if ( dy >= 0 ) 1575 { 1576 /* first quadrant, +x +y */ 1577 1578 if ( dx > MUL_INT32( 2, dy ) ) 1579 { 1580 /* +x */ 1581 *x = 0; 1582 *y = 0; 1583 } 1584 else if ( dy > MUL_INT32( 2, dx ) ) 1585 { 1586 /* +y */ 1587 *x = glyphpath->xOffset; 1588 *y = glyphpath->yOffset; 1589 } 1590 else 1591 { 1592 /* +x +y */ 1593 *x = FT_MulFix( cf2_doubleToFixed( 0.7 ), 1594 glyphpath->xOffset ); 1595 *y = FT_MulFix( cf2_doubleToFixed( 1.0 - 0.7 ), 1596 glyphpath->yOffset ); 1597 } 1598 } 1599 else 1600 { 1601 /* fourth quadrant, +x -y */ 1602 1603 if ( dx > MUL_INT32( -2, dy ) ) 1604 { 1605 /* +x */ 1606 *x = 0; 1607 *y = 0; 1608 } 1609 else if ( NEG_INT32( dy ) > MUL_INT32( 2, dx ) ) 1610 { 1611 /* -y */ 1612 *x = NEG_INT32( glyphpath->xOffset ); 1613 *y = glyphpath->yOffset; 1614 } 1615 else 1616 { 1617 /* +x -y */ 1618 *x = FT_MulFix( cf2_doubleToFixed( -0.7 ), 1619 glyphpath->xOffset ); 1620 *y = FT_MulFix( cf2_doubleToFixed( 1.0 - 0.7 ), 1621 glyphpath->yOffset ); 1622 } 1623 } 1624 } 1625 else 1626 { 1627 if ( dy >= 0 ) 1628 { 1629 /* second quadrant, -x +y */ 1630 1631 if ( NEG_INT32( dx ) > MUL_INT32( 2, dy ) ) 1632 { 1633 /* -x */ 1634 *x = 0; 1635 *y = MUL_INT32( 2, glyphpath->yOffset ); 1636 } 1637 else if ( dy > MUL_INT32( -2, dx ) ) 1638 { 1639 /* +y */ 1640 *x = glyphpath->xOffset; 1641 *y = glyphpath->yOffset; 1642 } 1643 else 1644 { 1645 /* -x +y */ 1646 *x = FT_MulFix( cf2_doubleToFixed( 0.7 ), 1647 glyphpath->xOffset ); 1648 *y = FT_MulFix( cf2_doubleToFixed( 1.0 + 0.7 ), 1649 glyphpath->yOffset ); 1650 } 1651 } 1652 else 1653 { 1654 /* third quadrant, -x -y */ 1655 1656 if ( NEG_INT32( dx ) > MUL_INT32( -2, dy ) ) 1657 { 1658 /* -x */ 1659 *x = 0; 1660 *y = MUL_INT32( 2, glyphpath->yOffset ); 1661 } 1662 else if ( NEG_INT32( dy ) > MUL_INT32( -2, dx ) ) 1663 { 1664 /* -y */ 1665 *x = NEG_INT32( glyphpath->xOffset ); 1666 *y = glyphpath->yOffset; 1667 } 1668 else 1669 { 1670 /* -x -y */ 1671 *x = FT_MulFix( cf2_doubleToFixed( -0.7 ), 1672 glyphpath->xOffset ); 1673 *y = FT_MulFix( cf2_doubleToFixed( 1.0 + 0.7 ), 1674 glyphpath->yOffset ); 1675 } 1676 } 1677 } 1678 } 1679 1680 1681 /* 1682 * The functions cf2_glyphpath_{moveTo,lineTo,curveTo,closeOpenPath} are 1683 * called by the interpreter with Character Space (CS) coordinates. Each 1684 * path element is placed into a queue of length one to await the 1685 * calculation of the following element. At that time, the darkening 1686 * offset of the following element is known and joins can be computed, 1687 * including possible modification of this element, before mapping to 1688 * Device Space (DS) and passing it on to the outline consumer. 1689 * 1690 */ 1691 FT_LOCAL_DEF( void ) cf2_glyphpath_moveTo(CF2_GlyphPath glyphpath,CF2_Fixed x,CF2_Fixed y)1692 cf2_glyphpath_moveTo( CF2_GlyphPath glyphpath, 1693 CF2_Fixed x, 1694 CF2_Fixed y ) 1695 { 1696 cf2_glyphpath_closeOpenPath( glyphpath ); 1697 1698 /* save the parameters of the move for later, when we'll know how to */ 1699 /* offset it; */ 1700 /* also save last move point */ 1701 glyphpath->currentCS.x = glyphpath->start.x = x; 1702 glyphpath->currentCS.y = glyphpath->start.y = y; 1703 1704 glyphpath->moveIsPending = TRUE; 1705 1706 /* ensure we have a valid map with current mask */ 1707 if ( !cf2_hintmap_isValid( &glyphpath->hintMap ) || 1708 cf2_hintmask_isNew( glyphpath->hintMask ) ) 1709 cf2_hintmap_build( &glyphpath->hintMap, 1710 glyphpath->hStemHintArray, 1711 glyphpath->vStemHintArray, 1712 glyphpath->hintMask, 1713 glyphpath->hintOriginY, 1714 FALSE ); 1715 1716 /* save a copy of current HintMap to use when drawing initial point */ 1717 glyphpath->firstHintMap = glyphpath->hintMap; /* structure copy */ 1718 } 1719 1720 1721 FT_LOCAL_DEF( void ) cf2_glyphpath_lineTo(CF2_GlyphPath glyphpath,CF2_Fixed x,CF2_Fixed y)1722 cf2_glyphpath_lineTo( CF2_GlyphPath glyphpath, 1723 CF2_Fixed x, 1724 CF2_Fixed y ) 1725 { 1726 CF2_Fixed xOffset, yOffset; 1727 FT_Vector P0, P1; 1728 FT_Bool newHintMap; 1729 1730 /* 1731 * New hints will be applied after cf2_glyphpath_pushPrevElem has run. 1732 * In case this is a synthesized closing line, any new hints should be 1733 * delayed until this path is closed (`cf2_hintmask_isNew' will be 1734 * called again before the next line or curve). 1735 */ 1736 1737 /* true if new hint map not on close */ 1738 newHintMap = cf2_hintmask_isNew( glyphpath->hintMask ) && 1739 !glyphpath->pathIsClosing; 1740 1741 /* 1742 * Zero-length lines may occur in the charstring. Because we cannot 1743 * compute darkening offsets or intersections from zero-length lines, 1744 * it is best to remove them and avoid artifacts. However, zero-length 1745 * lines in CS at the start of a new hint map can generate non-zero 1746 * lines in DS due to hint substitution. We detect a change in hint 1747 * map here and pass those zero-length lines along. 1748 */ 1749 1750 /* 1751 * Note: Find explicitly closed paths here with a conditional 1752 * breakpoint using 1753 * 1754 * !gp->pathIsClosing && gp->start.x == x && gp->start.y == y 1755 * 1756 */ 1757 1758 if ( glyphpath->currentCS.x == x && 1759 glyphpath->currentCS.y == y && 1760 !newHintMap ) 1761 /* 1762 * Ignore zero-length lines in CS where the hint map is the same 1763 * because the line in DS will also be zero length. 1764 * 1765 * Ignore zero-length lines when we synthesize a closing line because 1766 * the close will be handled in cf2_glyphPath_pushPrevElem. 1767 */ 1768 return; 1769 1770 cf2_glyphpath_computeOffset( glyphpath, 1771 glyphpath->currentCS.x, 1772 glyphpath->currentCS.y, 1773 x, 1774 y, 1775 &xOffset, 1776 &yOffset ); 1777 1778 /* construct offset points */ 1779 P0.x = ADD_INT32( glyphpath->currentCS.x, xOffset ); 1780 P0.y = ADD_INT32( glyphpath->currentCS.y, yOffset ); 1781 P1.x = ADD_INT32( x, xOffset ); 1782 P1.y = ADD_INT32( y, yOffset ); 1783 1784 if ( glyphpath->moveIsPending ) 1785 { 1786 /* emit offset 1st point as MoveTo */ 1787 cf2_glyphpath_pushMove( glyphpath, P0 ); 1788 1789 glyphpath->moveIsPending = FALSE; /* adjust state machine */ 1790 glyphpath->pathIsOpen = TRUE; 1791 1792 glyphpath->offsetStart1 = P1; /* record second point */ 1793 } 1794 1795 if ( glyphpath->elemIsQueued ) 1796 { 1797 FT_ASSERT( cf2_hintmap_isValid( &glyphpath->hintMap ) || 1798 glyphpath->hintMap.count == 0 ); 1799 1800 cf2_glyphpath_pushPrevElem( glyphpath, 1801 &glyphpath->hintMap, 1802 &P0, 1803 P1, 1804 FALSE ); 1805 } 1806 1807 /* queue the current element with offset points */ 1808 glyphpath->elemIsQueued = TRUE; 1809 glyphpath->prevElemOp = CF2_PathOpLineTo; 1810 glyphpath->prevElemP0 = P0; 1811 glyphpath->prevElemP1 = P1; 1812 1813 /* update current map */ 1814 if ( newHintMap ) 1815 cf2_hintmap_build( &glyphpath->hintMap, 1816 glyphpath->hStemHintArray, 1817 glyphpath->vStemHintArray, 1818 glyphpath->hintMask, 1819 glyphpath->hintOriginY, 1820 FALSE ); 1821 1822 glyphpath->currentCS.x = x; /* pre-offset current point */ 1823 glyphpath->currentCS.y = y; 1824 } 1825 1826 1827 FT_LOCAL_DEF( void ) cf2_glyphpath_curveTo(CF2_GlyphPath glyphpath,CF2_Fixed x1,CF2_Fixed y1,CF2_Fixed x2,CF2_Fixed y2,CF2_Fixed x3,CF2_Fixed y3)1828 cf2_glyphpath_curveTo( CF2_GlyphPath glyphpath, 1829 CF2_Fixed x1, 1830 CF2_Fixed y1, 1831 CF2_Fixed x2, 1832 CF2_Fixed y2, 1833 CF2_Fixed x3, 1834 CF2_Fixed y3 ) 1835 { 1836 CF2_Fixed xOffset1, yOffset1, xOffset3, yOffset3; 1837 FT_Vector P0, P1, P2, P3; 1838 1839 1840 /* TODO: ignore zero length portions of curve?? */ 1841 cf2_glyphpath_computeOffset( glyphpath, 1842 glyphpath->currentCS.x, 1843 glyphpath->currentCS.y, 1844 x1, 1845 y1, 1846 &xOffset1, 1847 &yOffset1 ); 1848 cf2_glyphpath_computeOffset( glyphpath, 1849 x2, 1850 y2, 1851 x3, 1852 y3, 1853 &xOffset3, 1854 &yOffset3 ); 1855 1856 /* add momentum from the middle segment */ 1857 glyphpath->callbacks->windingMomentum = 1858 ADD_INT32( glyphpath->callbacks->windingMomentum, 1859 cf2_getWindingMomentum( x1, y1, x2, y2 ) ); 1860 1861 /* construct offset points */ 1862 P0.x = ADD_INT32( glyphpath->currentCS.x, xOffset1 ); 1863 P0.y = ADD_INT32( glyphpath->currentCS.y, yOffset1 ); 1864 P1.x = ADD_INT32( x1, xOffset1 ); 1865 P1.y = ADD_INT32( y1, yOffset1 ); 1866 /* note: preserve angle of final segment by using offset3 at both ends */ 1867 P2.x = ADD_INT32( x2, xOffset3 ); 1868 P2.y = ADD_INT32( y2, yOffset3 ); 1869 P3.x = ADD_INT32( x3, xOffset3 ); 1870 P3.y = ADD_INT32( y3, yOffset3 ); 1871 1872 if ( glyphpath->moveIsPending ) 1873 { 1874 /* emit offset 1st point as MoveTo */ 1875 cf2_glyphpath_pushMove( glyphpath, P0 ); 1876 1877 glyphpath->moveIsPending = FALSE; 1878 glyphpath->pathIsOpen = TRUE; 1879 1880 glyphpath->offsetStart1 = P1; /* record second point */ 1881 } 1882 1883 if ( glyphpath->elemIsQueued ) 1884 { 1885 FT_ASSERT( cf2_hintmap_isValid( &glyphpath->hintMap ) || 1886 glyphpath->hintMap.count == 0 ); 1887 1888 cf2_glyphpath_pushPrevElem( glyphpath, 1889 &glyphpath->hintMap, 1890 &P0, 1891 P1, 1892 FALSE ); 1893 } 1894 1895 /* queue the current element with offset points */ 1896 glyphpath->elemIsQueued = TRUE; 1897 glyphpath->prevElemOp = CF2_PathOpCubeTo; 1898 glyphpath->prevElemP0 = P0; 1899 glyphpath->prevElemP1 = P1; 1900 glyphpath->prevElemP2 = P2; 1901 glyphpath->prevElemP3 = P3; 1902 1903 /* update current map */ 1904 if ( cf2_hintmask_isNew( glyphpath->hintMask ) ) 1905 cf2_hintmap_build( &glyphpath->hintMap, 1906 glyphpath->hStemHintArray, 1907 glyphpath->vStemHintArray, 1908 glyphpath->hintMask, 1909 glyphpath->hintOriginY, 1910 FALSE ); 1911 1912 glyphpath->currentCS.x = x3; /* pre-offset current point */ 1913 glyphpath->currentCS.y = y3; 1914 } 1915 1916 1917 FT_LOCAL_DEF( void ) cf2_glyphpath_closeOpenPath(CF2_GlyphPath glyphpath)1918 cf2_glyphpath_closeOpenPath( CF2_GlyphPath glyphpath ) 1919 { 1920 if ( glyphpath->pathIsOpen ) 1921 { 1922 /* 1923 * A closing line in Character Space line is always generated below 1924 * with `cf2_glyphPath_lineTo'. It may be ignored later if it turns 1925 * out to be zero length in Device Space. 1926 */ 1927 glyphpath->pathIsClosing = TRUE; 1928 1929 cf2_glyphpath_lineTo( glyphpath, 1930 glyphpath->start.x, 1931 glyphpath->start.y ); 1932 1933 /* empty the final element from the queue and close the path */ 1934 if ( glyphpath->elemIsQueued ) 1935 cf2_glyphpath_pushPrevElem( glyphpath, 1936 &glyphpath->hintMap, 1937 &glyphpath->offsetStart0, 1938 glyphpath->offsetStart1, 1939 TRUE ); 1940 1941 /* reset state machine */ 1942 glyphpath->moveIsPending = TRUE; 1943 glyphpath->pathIsOpen = FALSE; 1944 glyphpath->pathIsClosing = FALSE; 1945 glyphpath->elemIsQueued = FALSE; 1946 } 1947 } 1948 1949 1950 /* END */ 1951