1 /***************************************************************************/ 2 /* */ 3 /* afcjk.c */ 4 /* */ 5 /* Auto-fitter hinting routines for CJK writing system (body). */ 6 /* */ 7 /* Copyright 2006-2015 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 * The algorithm is based on akito's autohint patch, available here: 20 * 21 * http://www.kde.gr.jp/~akito/patch/freetype2/ 22 * 23 */ 24 25 #include <ft2build.h> 26 #include FT_ADVANCES_H 27 #include FT_INTERNAL_DEBUG_H 28 29 #include "afglobal.h" 30 #include "afpic.h" 31 #include "aflatin.h" 32 33 34 #ifdef AF_CONFIG_OPTION_CJK 35 36 #undef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT 37 38 #include "afcjk.h" 39 #include "aferrors.h" 40 41 42 #ifdef AF_CONFIG_OPTION_USE_WARPER 43 #include "afwarp.h" 44 #endif 45 46 47 /*************************************************************************/ 48 /* */ 49 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 50 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 51 /* messages during execution. */ 52 /* */ 53 #undef FT_COMPONENT 54 #define FT_COMPONENT trace_afcjk 55 56 57 /*************************************************************************/ 58 /*************************************************************************/ 59 /***** *****/ 60 /***** C J K G L O B A L M E T R I C S *****/ 61 /***** *****/ 62 /*************************************************************************/ 63 /*************************************************************************/ 64 65 66 /* Basically the Latin version with AF_CJKMetrics */ 67 /* to replace AF_LatinMetrics. */ 68 69 FT_LOCAL_DEF( void ) af_cjk_metrics_init_widths(AF_CJKMetrics metrics,FT_Face face)70 af_cjk_metrics_init_widths( AF_CJKMetrics metrics, 71 FT_Face face ) 72 { 73 /* scan the array of segments in each direction */ 74 AF_GlyphHintsRec hints[1]; 75 76 77 FT_TRACE5(( "\n" 78 "cjk standard widths computation (style `%s')\n" 79 "===================================================\n" 80 "\n", 81 af_style_names[metrics->root.style_class->style] )); 82 83 af_glyph_hints_init( hints, face->memory ); 84 85 metrics->axis[AF_DIMENSION_HORZ].width_count = 0; 86 metrics->axis[AF_DIMENSION_VERT].width_count = 0; 87 88 { 89 FT_Error error; 90 FT_ULong glyph_index; 91 FT_Long y_offset; 92 int dim; 93 AF_CJKMetricsRec dummy[1]; 94 AF_Scaler scaler = &dummy->root.scaler; 95 96 #ifdef FT_CONFIG_OPTION_PIC 97 AF_FaceGlobals globals = metrics->root.globals; 98 #endif 99 100 AF_StyleClass style_class = metrics->root.style_class; 101 AF_ScriptClass script_class = AF_SCRIPT_CLASSES_GET 102 [style_class->script]; 103 104 FT_UInt32 standard_char; 105 106 107 standard_char = script_class->standard_char1; 108 af_get_char_index( &metrics->root, 109 standard_char, 110 &glyph_index, 111 &y_offset ); 112 if ( !glyph_index ) 113 { 114 if ( script_class->standard_char2 ) 115 { 116 standard_char = script_class->standard_char2; 117 af_get_char_index( &metrics->root, 118 standard_char, 119 &glyph_index, 120 &y_offset ); 121 if ( !glyph_index ) 122 { 123 if ( script_class->standard_char3 ) 124 { 125 standard_char = script_class->standard_char3; 126 af_get_char_index( &metrics->root, 127 standard_char, 128 &glyph_index, 129 &y_offset ); 130 if ( !glyph_index ) 131 goto Exit; 132 } 133 else 134 goto Exit; 135 } 136 } 137 else 138 goto Exit; 139 } 140 141 FT_TRACE5(( "standard character: U+%04lX (glyph index %d)\n", 142 standard_char, glyph_index )); 143 144 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 145 if ( error || face->glyph->outline.n_points <= 0 ) 146 goto Exit; 147 148 FT_ZERO( dummy ); 149 150 dummy->units_per_em = metrics->units_per_em; 151 152 scaler->x_scale = 0x10000L; 153 scaler->y_scale = 0x10000L; 154 scaler->x_delta = 0; 155 scaler->y_delta = 0; 156 157 scaler->face = face; 158 scaler->render_mode = FT_RENDER_MODE_NORMAL; 159 scaler->flags = 0; 160 161 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy ); 162 163 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 164 if ( error ) 165 goto Exit; 166 167 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 168 { 169 AF_CJKAxis axis = &metrics->axis[dim]; 170 AF_AxisHints axhints = &hints->axis[dim]; 171 AF_Segment seg, limit, link; 172 FT_UInt num_widths = 0; 173 174 175 error = af_latin_hints_compute_segments( hints, 176 (AF_Dimension)dim ); 177 if ( error ) 178 goto Exit; 179 180 af_latin_hints_link_segments( hints, 181 0, 182 NULL, 183 (AF_Dimension)dim ); 184 185 seg = axhints->segments; 186 limit = seg + axhints->num_segments; 187 188 for ( ; seg < limit; seg++ ) 189 { 190 link = seg->link; 191 192 /* we only consider stem segments there! */ 193 if ( link && link->link == seg && link > seg ) 194 { 195 FT_Pos dist; 196 197 198 dist = seg->pos - link->pos; 199 if ( dist < 0 ) 200 dist = -dist; 201 202 if ( num_widths < AF_CJK_MAX_WIDTHS ) 203 axis->widths[num_widths++].org = dist; 204 } 205 } 206 207 /* this also replaces multiple almost identical stem widths */ 208 /* with a single one (the value 100 is heuristic) */ 209 af_sort_and_quantize_widths( &num_widths, axis->widths, 210 dummy->units_per_em / 100 ); 211 axis->width_count = num_widths; 212 } 213 214 Exit: 215 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 216 { 217 AF_CJKAxis axis = &metrics->axis[dim]; 218 FT_Pos stdw; 219 220 221 stdw = ( axis->width_count > 0 ) ? axis->widths[0].org 222 : AF_LATIN_CONSTANT( metrics, 50 ); 223 224 /* let's try 20% of the smallest width */ 225 axis->edge_distance_threshold = stdw / 5; 226 axis->standard_width = stdw; 227 axis->extra_light = 0; 228 229 #ifdef FT_DEBUG_LEVEL_TRACE 230 { 231 FT_UInt i; 232 233 234 FT_TRACE5(( "%s widths:\n", 235 dim == AF_DIMENSION_VERT ? "horizontal" 236 : "vertical" )); 237 238 FT_TRACE5(( " %d (standard)", axis->standard_width )); 239 for ( i = 1; i < axis->width_count; i++ ) 240 FT_TRACE5(( " %d", axis->widths[i].org )); 241 242 FT_TRACE5(( "\n" )); 243 } 244 #endif 245 } 246 } 247 248 FT_TRACE5(( "\n" )); 249 250 af_glyph_hints_done( hints ); 251 } 252 253 254 /* Find all blue zones. */ 255 256 static void af_cjk_metrics_init_blues(AF_CJKMetrics metrics,FT_Face face)257 af_cjk_metrics_init_blues( AF_CJKMetrics metrics, 258 FT_Face face ) 259 { 260 FT_Pos fills[AF_BLUE_STRING_MAX_LEN]; 261 FT_Pos flats[AF_BLUE_STRING_MAX_LEN]; 262 263 FT_UInt num_fills; 264 FT_UInt num_flats; 265 266 FT_Bool fill; 267 268 AF_CJKBlue blue; 269 FT_Error error; 270 AF_CJKAxis axis; 271 FT_Outline outline; 272 273 AF_StyleClass sc = metrics->root.style_class; 274 275 AF_Blue_Stringset bss = sc->blue_stringset; 276 const AF_Blue_StringRec* bs = &af_blue_stringsets[bss]; 277 278 279 /* we walk over the blue character strings as specified in the */ 280 /* style's entry in the `af_blue_stringset' array, computing its */ 281 /* extremum points (depending on the string properties) */ 282 283 FT_TRACE5(( "cjk blue zones computation\n" 284 "==========================\n" 285 "\n" )); 286 287 for ( ; bs->string != AF_BLUE_STRING_MAX; bs++ ) 288 { 289 const char* p = &af_blue_strings[bs->string]; 290 FT_Pos* blue_ref; 291 FT_Pos* blue_shoot; 292 293 294 if ( AF_CJK_IS_HORIZ_BLUE( bs ) ) 295 axis = &metrics->axis[AF_DIMENSION_HORZ]; 296 else 297 axis = &metrics->axis[AF_DIMENSION_VERT]; 298 299 #ifdef FT_DEBUG_LEVEL_TRACE 300 { 301 FT_String* cjk_blue_name[4] = 302 { 303 (FT_String*)"bottom", /* -- , -- */ 304 (FT_String*)"top", /* -- , TOP */ 305 (FT_String*)"left", /* HORIZ, -- */ 306 (FT_String*)"right" /* HORIZ, TOP */ 307 }; 308 309 310 FT_TRACE5(( "blue zone %d (%s):\n", 311 axis->blue_count, 312 cjk_blue_name[AF_CJK_IS_HORIZ_BLUE( bs ) | 313 AF_CJK_IS_TOP_BLUE( bs ) ] )); 314 } 315 #endif /* FT_DEBUG_LEVEL_TRACE */ 316 317 num_fills = 0; 318 num_flats = 0; 319 320 fill = 1; /* start with characters that define fill values */ 321 FT_TRACE5(( " [overshoot values]\n" )); 322 323 while ( *p ) 324 { 325 FT_ULong ch; 326 FT_ULong glyph_index; 327 FT_Long y_offset; 328 FT_Pos best_pos; /* same as points.y or points.x, resp. */ 329 FT_Int best_point; 330 FT_Vector* points; 331 332 333 GET_UTF8_CHAR( ch, p ); 334 335 /* switch to characters that define flat values */ 336 if ( ch == '|' ) 337 { 338 fill = 0; 339 FT_TRACE5(( " [reference values]\n" )); 340 continue; 341 } 342 343 /* load the character in the face -- skip unknown or empty ones */ 344 af_get_char_index( &metrics->root, ch, &glyph_index, &y_offset ); 345 if ( glyph_index == 0 ) 346 { 347 FT_TRACE5(( " U+%04lX unavailable\n", ch )); 348 continue; 349 } 350 351 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 352 outline = face->glyph->outline; 353 if ( error || outline.n_points <= 0 ) 354 { 355 FT_TRACE5(( " U+%04lX contains no outlines\n", ch )); 356 continue; 357 } 358 359 /* now compute min or max point indices and coordinates */ 360 points = outline.points; 361 best_point = -1; 362 best_pos = 0; /* make compiler happy */ 363 364 { 365 FT_Int nn; 366 FT_Int first = 0; 367 FT_Int last = -1; 368 369 370 for ( nn = 0; nn < outline.n_contours; first = last + 1, nn++ ) 371 { 372 FT_Int pp; 373 374 375 last = outline.contours[nn]; 376 377 /* Avoid single-point contours since they are never rasterized. */ 378 /* In some fonts, they correspond to mark attachment points */ 379 /* which are way outside of the glyph's real outline. */ 380 if ( last <= first ) 381 continue; 382 383 if ( AF_CJK_IS_HORIZ_BLUE( bs ) ) 384 { 385 if ( AF_CJK_IS_RIGHT_BLUE( bs ) ) 386 { 387 for ( pp = first; pp <= last; pp++ ) 388 if ( best_point < 0 || points[pp].x > best_pos ) 389 { 390 best_point = pp; 391 best_pos = points[pp].x; 392 } 393 } 394 else 395 { 396 for ( pp = first; pp <= last; pp++ ) 397 if ( best_point < 0 || points[pp].x < best_pos ) 398 { 399 best_point = pp; 400 best_pos = points[pp].x; 401 } 402 } 403 } 404 else 405 { 406 if ( AF_CJK_IS_TOP_BLUE( bs ) ) 407 { 408 for ( pp = first; pp <= last; pp++ ) 409 if ( best_point < 0 || points[pp].y > best_pos ) 410 { 411 best_point = pp; 412 best_pos = points[pp].y; 413 } 414 } 415 else 416 { 417 for ( pp = first; pp <= last; pp++ ) 418 if ( best_point < 0 || points[pp].y < best_pos ) 419 { 420 best_point = pp; 421 best_pos = points[pp].y; 422 } 423 } 424 } 425 } 426 427 FT_TRACE5(( " U+%04lX: best_pos = %5ld\n", ch, best_pos )); 428 } 429 430 if ( fill ) 431 fills[num_fills++] = best_pos; 432 else 433 flats[num_flats++] = best_pos; 434 } 435 436 if ( num_flats == 0 && num_fills == 0 ) 437 { 438 /* 439 * we couldn't find a single glyph to compute this blue zone, 440 * we will simply ignore it then 441 */ 442 FT_TRACE5(( " empty\n" )); 443 continue; 444 } 445 446 /* we have computed the contents of the `fill' and `flats' tables, */ 447 /* now determine the reference and overshoot position of the blue -- */ 448 /* we simply take the median value after a simple sort */ 449 af_sort_pos( num_fills, fills ); 450 af_sort_pos( num_flats, flats ); 451 452 blue = &axis->blues[axis->blue_count]; 453 blue_ref = &blue->ref.org; 454 blue_shoot = &blue->shoot.org; 455 456 axis->blue_count++; 457 458 if ( num_flats == 0 ) 459 { 460 *blue_ref = 461 *blue_shoot = fills[num_fills / 2]; 462 } 463 else if ( num_fills == 0 ) 464 { 465 *blue_ref = 466 *blue_shoot = flats[num_flats / 2]; 467 } 468 else 469 { 470 *blue_ref = fills[num_fills / 2]; 471 *blue_shoot = flats[num_flats / 2]; 472 } 473 474 /* make sure blue_ref >= blue_shoot for top/right or */ 475 /* vice versa for bottom/left */ 476 if ( *blue_shoot != *blue_ref ) 477 { 478 FT_Pos ref = *blue_ref; 479 FT_Pos shoot = *blue_shoot; 480 FT_Bool under_ref = FT_BOOL( shoot < ref ); 481 482 483 /* AF_CJK_IS_TOP_BLUE covers `right' and `top' */ 484 if ( AF_CJK_IS_TOP_BLUE( bs ) ^ under_ref ) 485 { 486 *blue_ref = 487 *blue_shoot = ( shoot + ref ) / 2; 488 489 FT_TRACE5(( " [reference smaller than overshoot," 490 " taking mean value]\n" )); 491 } 492 } 493 494 blue->flags = 0; 495 if ( AF_CJK_IS_TOP_BLUE( bs ) ) 496 blue->flags |= AF_CJK_BLUE_TOP; 497 498 FT_TRACE5(( " -> reference = %ld\n" 499 " overshoot = %ld\n", 500 *blue_ref, *blue_shoot )); 501 } 502 503 FT_TRACE5(( "\n" )); 504 505 return; 506 } 507 508 509 /* Basically the Latin version with type AF_CJKMetrics for metrics. */ 510 511 FT_LOCAL_DEF( void ) af_cjk_metrics_check_digits(AF_CJKMetrics metrics,FT_Face face)512 af_cjk_metrics_check_digits( AF_CJKMetrics metrics, 513 FT_Face face ) 514 { 515 FT_UInt i; 516 FT_Bool started = 0, same_width = 1; 517 FT_Fixed advance, old_advance = 0; 518 519 520 /* digit `0' is 0x30 in all supported charmaps */ 521 for ( i = 0x30; i <= 0x39; i++ ) 522 { 523 FT_ULong glyph_index; 524 FT_Long y_offset; 525 526 527 af_get_char_index( &metrics->root, i, &glyph_index, &y_offset ); 528 if ( glyph_index == 0 ) 529 continue; 530 531 if ( FT_Get_Advance( face, glyph_index, 532 FT_LOAD_NO_SCALE | 533 FT_LOAD_NO_HINTING | 534 FT_LOAD_IGNORE_TRANSFORM, 535 &advance ) ) 536 continue; 537 538 if ( started ) 539 { 540 if ( advance != old_advance ) 541 { 542 same_width = 0; 543 break; 544 } 545 } 546 else 547 { 548 old_advance = advance; 549 started = 1; 550 } 551 } 552 553 metrics->root.digits_have_same_width = same_width; 554 } 555 556 557 /* Initialize global metrics. */ 558 559 FT_LOCAL_DEF( FT_Error ) af_cjk_metrics_init(AF_CJKMetrics metrics,FT_Face face)560 af_cjk_metrics_init( AF_CJKMetrics metrics, 561 FT_Face face ) 562 { 563 FT_CharMap oldmap = face->charmap; 564 565 566 metrics->units_per_em = face->units_per_EM; 567 568 if ( !FT_Select_Charmap( face, FT_ENCODING_UNICODE ) ) 569 { 570 af_cjk_metrics_init_widths( metrics, face ); 571 af_cjk_metrics_init_blues( metrics, face ); 572 af_cjk_metrics_check_digits( metrics, face ); 573 } 574 575 FT_Set_Charmap( face, oldmap ); 576 return FT_Err_Ok; 577 } 578 579 580 /* Adjust scaling value, then scale and shift widths */ 581 /* and blue zones (if applicable) for given dimension. */ 582 583 static void af_cjk_metrics_scale_dim(AF_CJKMetrics metrics,AF_Scaler scaler,AF_Dimension dim)584 af_cjk_metrics_scale_dim( AF_CJKMetrics metrics, 585 AF_Scaler scaler, 586 AF_Dimension dim ) 587 { 588 FT_Fixed scale; 589 FT_Pos delta; 590 AF_CJKAxis axis; 591 FT_UInt nn; 592 593 594 if ( dim == AF_DIMENSION_HORZ ) 595 { 596 scale = scaler->x_scale; 597 delta = scaler->x_delta; 598 } 599 else 600 { 601 scale = scaler->y_scale; 602 delta = scaler->y_delta; 603 } 604 605 axis = &metrics->axis[dim]; 606 607 if ( axis->org_scale == scale && axis->org_delta == delta ) 608 return; 609 610 axis->org_scale = scale; 611 axis->org_delta = delta; 612 613 axis->scale = scale; 614 axis->delta = delta; 615 616 /* scale the blue zones */ 617 for ( nn = 0; nn < axis->blue_count; nn++ ) 618 { 619 AF_CJKBlue blue = &axis->blues[nn]; 620 FT_Pos dist; 621 622 623 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 624 blue->ref.fit = blue->ref.cur; 625 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 626 blue->shoot.fit = blue->shoot.cur; 627 blue->flags &= ~AF_CJK_BLUE_ACTIVE; 628 629 /* a blue zone is only active if it is less than 3/4 pixels tall */ 630 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 631 if ( dist <= 48 && dist >= -48 ) 632 { 633 FT_Pos delta1, delta2; 634 635 636 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 637 638 /* shoot is under shoot for cjk */ 639 delta1 = FT_DivFix( blue->ref.fit, scale ) - blue->shoot.org; 640 delta2 = delta1; 641 if ( delta1 < 0 ) 642 delta2 = -delta2; 643 644 delta2 = FT_MulFix( delta2, scale ); 645 646 FT_TRACE5(( "delta: %d", delta1 )); 647 if ( delta2 < 32 ) 648 delta2 = 0; 649 #if 0 650 else if ( delta2 < 64 ) 651 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 652 #endif 653 else 654 delta2 = FT_PIX_ROUND( delta2 ); 655 FT_TRACE5(( "/%d\n", delta2 )); 656 657 if ( delta1 < 0 ) 658 delta2 = -delta2; 659 660 blue->shoot.fit = blue->ref.fit - delta2; 661 662 FT_TRACE5(( ">> active cjk blue zone %c%d[%ld/%ld]:\n" 663 " ref: cur=%.2f fit=%.2f\n" 664 " shoot: cur=%.2f fit=%.2f\n", 665 ( dim == AF_DIMENSION_HORZ ) ? 'H' : 'V', 666 nn, blue->ref.org, blue->shoot.org, 667 blue->ref.cur / 64.0, blue->ref.fit / 64.0, 668 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 )); 669 670 blue->flags |= AF_CJK_BLUE_ACTIVE; 671 } 672 } 673 } 674 675 676 /* Scale global values in both directions. */ 677 678 FT_LOCAL_DEF( void ) af_cjk_metrics_scale(AF_CJKMetrics metrics,AF_Scaler scaler)679 af_cjk_metrics_scale( AF_CJKMetrics metrics, 680 AF_Scaler scaler ) 681 { 682 /* we copy the whole structure since the x and y scaling values */ 683 /* are not modified, contrary to e.g. the `latin' auto-hinter */ 684 metrics->root.scaler = *scaler; 685 686 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 687 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 688 } 689 690 691 /*************************************************************************/ 692 /*************************************************************************/ 693 /***** *****/ 694 /***** C J K G L Y P H A N A L Y S I S *****/ 695 /***** *****/ 696 /*************************************************************************/ 697 /*************************************************************************/ 698 699 700 /* Walk over all contours and compute its segments. */ 701 702 static FT_Error af_cjk_hints_compute_segments(AF_GlyphHints hints,AF_Dimension dim)703 af_cjk_hints_compute_segments( AF_GlyphHints hints, 704 AF_Dimension dim ) 705 { 706 AF_AxisHints axis = &hints->axis[dim]; 707 AF_Segment segments = axis->segments; 708 AF_Segment segment_limit = segments + axis->num_segments; 709 FT_Error error; 710 AF_Segment seg; 711 712 713 error = af_latin_hints_compute_segments( hints, dim ); 714 if ( error ) 715 return error; 716 717 /* a segment is round if it doesn't have successive */ 718 /* on-curve points. */ 719 for ( seg = segments; seg < segment_limit; seg++ ) 720 { 721 AF_Point pt = seg->first; 722 AF_Point last = seg->last; 723 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL; 724 FT_UInt f1; 725 726 727 seg->flags &= ~AF_EDGE_ROUND; 728 729 for ( ; pt != last; f0 = f1 ) 730 { 731 pt = pt->next; 732 f1 = pt->flags & AF_FLAG_CONTROL; 733 734 if ( !f0 && !f1 ) 735 break; 736 737 if ( pt == last ) 738 seg->flags |= AF_EDGE_ROUND; 739 } 740 } 741 742 return FT_Err_Ok; 743 } 744 745 746 static void af_cjk_hints_link_segments(AF_GlyphHints hints,AF_Dimension dim)747 af_cjk_hints_link_segments( AF_GlyphHints hints, 748 AF_Dimension dim ) 749 { 750 AF_AxisHints axis = &hints->axis[dim]; 751 AF_Segment segments = axis->segments; 752 AF_Segment segment_limit = segments + axis->num_segments; 753 AF_Direction major_dir = axis->major_dir; 754 AF_Segment seg1, seg2; 755 FT_Pos len_threshold; 756 FT_Pos dist_threshold; 757 758 759 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 760 761 dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 762 : hints->y_scale; 763 dist_threshold = FT_DivFix( 64 * 3, dist_threshold ); 764 765 /* now compare each segment to the others */ 766 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 767 { 768 if ( seg1->dir != major_dir ) 769 continue; 770 771 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 772 if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 ) 773 { 774 FT_Pos dist = seg2->pos - seg1->pos; 775 776 777 if ( dist < 0 ) 778 continue; 779 780 { 781 FT_Pos min = seg1->min_coord; 782 FT_Pos max = seg1->max_coord; 783 FT_Pos len; 784 785 786 if ( min < seg2->min_coord ) 787 min = seg2->min_coord; 788 789 if ( max > seg2->max_coord ) 790 max = seg2->max_coord; 791 792 len = max - min; 793 if ( len >= len_threshold ) 794 { 795 if ( dist * 8 < seg1->score * 9 && 796 ( dist * 8 < seg1->score * 7 || seg1->len < len ) ) 797 { 798 seg1->score = dist; 799 seg1->len = len; 800 seg1->link = seg2; 801 } 802 803 if ( dist * 8 < seg2->score * 9 && 804 ( dist * 8 < seg2->score * 7 || seg2->len < len ) ) 805 { 806 seg2->score = dist; 807 seg2->len = len; 808 seg2->link = seg1; 809 } 810 } 811 } 812 } 813 } 814 815 /* 816 * now compute the `serif' segments 817 * 818 * In Hanzi, some strokes are wider on one or both of the ends. 819 * We either identify the stems on the ends as serifs or remove 820 * the linkage, depending on the length of the stems. 821 * 822 */ 823 824 { 825 AF_Segment link1, link2; 826 827 828 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 829 { 830 link1 = seg1->link; 831 if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos ) 832 continue; 833 834 if ( seg1->score >= dist_threshold ) 835 continue; 836 837 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 838 { 839 if ( seg2->pos > seg1->pos || seg1 == seg2 ) 840 continue; 841 842 link2 = seg2->link; 843 if ( !link2 || link2->link != seg2 || link2->pos < link1->pos ) 844 continue; 845 846 if ( seg1->pos == seg2->pos && link1->pos == link2->pos ) 847 continue; 848 849 if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score ) 850 continue; 851 852 /* seg2 < seg1 < link1 < link2 */ 853 854 if ( seg1->len >= seg2->len * 3 ) 855 { 856 AF_Segment seg; 857 858 859 for ( seg = segments; seg < segment_limit; seg++ ) 860 { 861 AF_Segment link = seg->link; 862 863 864 if ( link == seg2 ) 865 { 866 seg->link = NULL; 867 seg->serif = link1; 868 } 869 else if ( link == link2 ) 870 { 871 seg->link = NULL; 872 seg->serif = seg1; 873 } 874 } 875 } 876 else 877 { 878 seg1->link = link1->link = NULL; 879 880 break; 881 } 882 } 883 } 884 } 885 886 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 887 { 888 seg2 = seg1->link; 889 890 if ( seg2 ) 891 { 892 seg2->num_linked++; 893 if ( seg2->link != seg1 ) 894 { 895 seg1->link = NULL; 896 897 if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 ) 898 seg1->serif = seg2->link; 899 else 900 seg2->num_linked--; 901 } 902 } 903 } 904 } 905 906 907 static FT_Error af_cjk_hints_compute_edges(AF_GlyphHints hints,AF_Dimension dim)908 af_cjk_hints_compute_edges( AF_GlyphHints hints, 909 AF_Dimension dim ) 910 { 911 AF_AxisHints axis = &hints->axis[dim]; 912 FT_Error error = FT_Err_Ok; 913 FT_Memory memory = hints->memory; 914 AF_CJKAxis laxis = &((AF_CJKMetrics)hints->metrics)->axis[dim]; 915 916 AF_Segment segments = axis->segments; 917 AF_Segment segment_limit = segments + axis->num_segments; 918 AF_Segment seg; 919 920 FT_Fixed scale; 921 FT_Pos edge_distance_threshold; 922 923 924 axis->num_edges = 0; 925 926 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 927 : hints->y_scale; 928 929 /*********************************************************************/ 930 /* */ 931 /* We begin by generating a sorted table of edges for the current */ 932 /* direction. To do so, we simply scan each segment and try to find */ 933 /* an edge in our table that corresponds to its position. */ 934 /* */ 935 /* If no edge is found, we create and insert a new edge in the */ 936 /* sorted table. Otherwise, we simply add the segment to the edge's */ 937 /* list which is then processed in the second step to compute the */ 938 /* edge's properties. */ 939 /* */ 940 /* Note that the edges table is sorted along the segment/edge */ 941 /* position. */ 942 /* */ 943 /*********************************************************************/ 944 945 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 946 scale ); 947 if ( edge_distance_threshold > 64 / 4 ) 948 edge_distance_threshold = FT_DivFix( 64 / 4, scale ); 949 else 950 edge_distance_threshold = laxis->edge_distance_threshold; 951 952 for ( seg = segments; seg < segment_limit; seg++ ) 953 { 954 AF_Edge found = NULL; 955 FT_Pos best = 0xFFFFU; 956 FT_Int ee; 957 958 959 /* look for an edge corresponding to the segment */ 960 for ( ee = 0; ee < axis->num_edges; ee++ ) 961 { 962 AF_Edge edge = axis->edges + ee; 963 FT_Pos dist; 964 965 966 if ( edge->dir != seg->dir ) 967 continue; 968 969 dist = seg->pos - edge->fpos; 970 if ( dist < 0 ) 971 dist = -dist; 972 973 if ( dist < edge_distance_threshold && dist < best ) 974 { 975 AF_Segment link = seg->link; 976 977 978 /* check whether all linked segments of the candidate edge */ 979 /* can make a single edge. */ 980 if ( link ) 981 { 982 AF_Segment seg1 = edge->first; 983 FT_Pos dist2 = 0; 984 985 986 do 987 { 988 AF_Segment link1 = seg1->link; 989 990 991 if ( link1 ) 992 { 993 dist2 = AF_SEGMENT_DIST( link, link1 ); 994 if ( dist2 >= edge_distance_threshold ) 995 break; 996 } 997 998 } while ( ( seg1 = seg1->edge_next ) != edge->first ); 999 1000 if ( dist2 >= edge_distance_threshold ) 1001 continue; 1002 } 1003 1004 best = dist; 1005 found = edge; 1006 } 1007 } 1008 1009 if ( !found ) 1010 { 1011 AF_Edge edge; 1012 1013 1014 /* insert a new edge in the list and */ 1015 /* sort according to the position */ 1016 error = af_axis_hints_new_edge( axis, seg->pos, 1017 (AF_Direction)seg->dir, 1018 memory, &edge ); 1019 if ( error ) 1020 goto Exit; 1021 1022 /* add the segment to the new edge's list */ 1023 FT_ZERO( edge ); 1024 1025 edge->first = seg; 1026 edge->last = seg; 1027 edge->dir = seg->dir; 1028 edge->fpos = seg->pos; 1029 edge->opos = FT_MulFix( seg->pos, scale ); 1030 edge->pos = edge->opos; 1031 seg->edge_next = seg; 1032 } 1033 else 1034 { 1035 /* if an edge was found, simply add the segment to the edge's */ 1036 /* list */ 1037 seg->edge_next = found->first; 1038 found->last->edge_next = seg; 1039 found->last = seg; 1040 } 1041 } 1042 1043 /******************************************************************/ 1044 /* */ 1045 /* Good, we now compute each edge's properties according to the */ 1046 /* segments found on its position. Basically, these are */ 1047 /* */ 1048 /* - the edge's main direction */ 1049 /* - stem edge, serif edge or both (which defaults to stem then) */ 1050 /* - rounded edge, straight or both (which defaults to straight) */ 1051 /* - link for edge */ 1052 /* */ 1053 /******************************************************************/ 1054 1055 /* first of all, set the `edge' field in each segment -- this is */ 1056 /* required in order to compute edge links */ 1057 1058 /* 1059 * Note that removing this loop and setting the `edge' field of each 1060 * segment directly in the code above slows down execution speed for 1061 * some reasons on platforms like the Sun. 1062 */ 1063 { 1064 AF_Edge edges = axis->edges; 1065 AF_Edge edge_limit = edges + axis->num_edges; 1066 AF_Edge edge; 1067 1068 1069 for ( edge = edges; edge < edge_limit; edge++ ) 1070 { 1071 seg = edge->first; 1072 if ( seg ) 1073 do 1074 { 1075 seg->edge = edge; 1076 seg = seg->edge_next; 1077 1078 } while ( seg != edge->first ); 1079 } 1080 1081 /* now compute each edge properties */ 1082 for ( edge = edges; edge < edge_limit; edge++ ) 1083 { 1084 FT_Int is_round = 0; /* does it contain round segments? */ 1085 FT_Int is_straight = 0; /* does it contain straight segments? */ 1086 1087 1088 seg = edge->first; 1089 1090 do 1091 { 1092 FT_Bool is_serif; 1093 1094 1095 /* check for roundness of segment */ 1096 if ( seg->flags & AF_EDGE_ROUND ) 1097 is_round++; 1098 else 1099 is_straight++; 1100 1101 /* check for links -- if seg->serif is set, then seg->link must */ 1102 /* be ignored */ 1103 is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge ); 1104 1105 if ( seg->link || is_serif ) 1106 { 1107 AF_Edge edge2; 1108 AF_Segment seg2; 1109 1110 1111 edge2 = edge->link; 1112 seg2 = seg->link; 1113 1114 if ( is_serif ) 1115 { 1116 seg2 = seg->serif; 1117 edge2 = edge->serif; 1118 } 1119 1120 if ( edge2 ) 1121 { 1122 FT_Pos edge_delta; 1123 FT_Pos seg_delta; 1124 1125 1126 edge_delta = edge->fpos - edge2->fpos; 1127 if ( edge_delta < 0 ) 1128 edge_delta = -edge_delta; 1129 1130 seg_delta = AF_SEGMENT_DIST( seg, seg2 ); 1131 1132 if ( seg_delta < edge_delta ) 1133 edge2 = seg2->edge; 1134 } 1135 else 1136 edge2 = seg2->edge; 1137 1138 if ( is_serif ) 1139 { 1140 edge->serif = edge2; 1141 edge2->flags |= AF_EDGE_SERIF; 1142 } 1143 else 1144 edge->link = edge2; 1145 } 1146 1147 seg = seg->edge_next; 1148 1149 } while ( seg != edge->first ); 1150 1151 /* set the round/straight flags */ 1152 edge->flags = AF_EDGE_NORMAL; 1153 1154 if ( is_round > 0 && is_round >= is_straight ) 1155 edge->flags |= AF_EDGE_ROUND; 1156 1157 /* get rid of serifs if link is set */ 1158 /* XXX: This gets rid of many unpleasant artefacts! */ 1159 /* Example: the `c' in cour.pfa at size 13 */ 1160 1161 if ( edge->serif && edge->link ) 1162 edge->serif = NULL; 1163 } 1164 } 1165 1166 Exit: 1167 return error; 1168 } 1169 1170 1171 /* Detect segments and edges for given dimension. */ 1172 1173 static FT_Error af_cjk_hints_detect_features(AF_GlyphHints hints,AF_Dimension dim)1174 af_cjk_hints_detect_features( AF_GlyphHints hints, 1175 AF_Dimension dim ) 1176 { 1177 FT_Error error; 1178 1179 1180 error = af_cjk_hints_compute_segments( hints, dim ); 1181 if ( !error ) 1182 { 1183 af_cjk_hints_link_segments( hints, dim ); 1184 1185 error = af_cjk_hints_compute_edges( hints, dim ); 1186 } 1187 return error; 1188 } 1189 1190 1191 /* Compute all edges which lie within blue zones. */ 1192 1193 static void af_cjk_hints_compute_blue_edges(AF_GlyphHints hints,AF_CJKMetrics metrics,AF_Dimension dim)1194 af_cjk_hints_compute_blue_edges( AF_GlyphHints hints, 1195 AF_CJKMetrics metrics, 1196 AF_Dimension dim ) 1197 { 1198 AF_AxisHints axis = &hints->axis[dim]; 1199 AF_Edge edge = axis->edges; 1200 AF_Edge edge_limit = edge + axis->num_edges; 1201 AF_CJKAxis cjk = &metrics->axis[dim]; 1202 FT_Fixed scale = cjk->scale; 1203 FT_Pos best_dist0; /* initial threshold */ 1204 1205 1206 /* compute the initial threshold as a fraction of the EM size */ 1207 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1208 1209 if ( best_dist0 > 64 / 2 ) /* maximum 1/2 pixel */ 1210 best_dist0 = 64 / 2; 1211 1212 /* compute which blue zones are active, i.e. have their scaled */ 1213 /* size < 3/4 pixels */ 1214 1215 /* If the distant between an edge and a blue zone is shorter than */ 1216 /* best_dist0, set the blue zone for the edge. Then search for */ 1217 /* the blue zone with the smallest best_dist to the edge. */ 1218 1219 for ( ; edge < edge_limit; edge++ ) 1220 { 1221 FT_UInt bb; 1222 AF_Width best_blue = NULL; 1223 FT_Pos best_dist = best_dist0; 1224 1225 1226 for ( bb = 0; bb < cjk->blue_count; bb++ ) 1227 { 1228 AF_CJKBlue blue = cjk->blues + bb; 1229 FT_Bool is_top_right_blue, is_major_dir; 1230 1231 1232 /* skip inactive blue zones (i.e., those that are too small) */ 1233 if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) ) 1234 continue; 1235 1236 /* if it is a top zone, check for right edges -- if it is a bottom */ 1237 /* zone, check for left edges */ 1238 /* */ 1239 /* of course, that's for TrueType */ 1240 is_top_right_blue = 1241 (FT_Byte)( ( blue->flags & AF_CJK_BLUE_TOP ) != 0 ); 1242 is_major_dir = 1243 FT_BOOL( edge->dir == axis->major_dir ); 1244 1245 /* if it is a top zone, the edge must be against the major */ 1246 /* direction; if it is a bottom zone, it must be in the major */ 1247 /* direction */ 1248 if ( is_top_right_blue ^ is_major_dir ) 1249 { 1250 FT_Pos dist; 1251 AF_Width compare; 1252 1253 1254 /* Compare the edge to the closest blue zone type */ 1255 if ( FT_ABS( edge->fpos - blue->ref.org ) > 1256 FT_ABS( edge->fpos - blue->shoot.org ) ) 1257 compare = &blue->shoot; 1258 else 1259 compare = &blue->ref; 1260 1261 dist = edge->fpos - compare->org; 1262 if ( dist < 0 ) 1263 dist = -dist; 1264 1265 dist = FT_MulFix( dist, scale ); 1266 if ( dist < best_dist ) 1267 { 1268 best_dist = dist; 1269 best_blue = compare; 1270 } 1271 } 1272 } 1273 1274 if ( best_blue ) 1275 edge->blue_edge = best_blue; 1276 } 1277 } 1278 1279 1280 /* Initalize hinting engine. */ 1281 1282 FT_LOCAL_DEF( FT_Error ) af_cjk_hints_init(AF_GlyphHints hints,AF_CJKMetrics metrics)1283 af_cjk_hints_init( AF_GlyphHints hints, 1284 AF_CJKMetrics metrics ) 1285 { 1286 FT_Render_Mode mode; 1287 FT_UInt32 scaler_flags, other_flags; 1288 1289 1290 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics ); 1291 1292 /* 1293 * correct x_scale and y_scale when needed, since they may have 1294 * been modified af_cjk_scale_dim above 1295 */ 1296 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1297 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1298 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1299 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1300 1301 /* compute flags depending on render mode, etc. */ 1302 mode = metrics->root.scaler.render_mode; 1303 1304 #if 0 /* AF_CONFIG_OPTION_USE_WARPER */ 1305 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1306 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1307 #endif 1308 1309 scaler_flags = hints->scaler_flags; 1310 other_flags = 0; 1311 1312 /* 1313 * We snap the width of vertical stems for the monochrome and 1314 * horizontal LCD rendering targets only. 1315 */ 1316 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1317 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1318 1319 /* 1320 * We snap the width of horizontal stems for the monochrome and 1321 * vertical LCD rendering targets only. 1322 */ 1323 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1324 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1325 1326 /* 1327 * We adjust stems to full pixels only if we don't use the `light' mode. 1328 */ 1329 if ( mode != FT_RENDER_MODE_LIGHT ) 1330 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1331 1332 if ( mode == FT_RENDER_MODE_MONO ) 1333 other_flags |= AF_LATIN_HINTS_MONO; 1334 1335 scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE; 1336 1337 #ifdef AF_CONFIG_OPTION_USE_WARPER 1338 /* get (global) warper flag */ 1339 if ( !metrics->root.globals->module->warping ) 1340 scaler_flags |= AF_SCALER_FLAG_NO_WARPER; 1341 #endif 1342 1343 hints->scaler_flags = scaler_flags; 1344 hints->other_flags = other_flags; 1345 1346 return FT_Err_Ok; 1347 } 1348 1349 1350 /*************************************************************************/ 1351 /*************************************************************************/ 1352 /***** *****/ 1353 /***** C J K G L Y P H G R I D - F I T T I N G *****/ 1354 /***** *****/ 1355 /*************************************************************************/ 1356 /*************************************************************************/ 1357 1358 /* Snap a given width in scaled coordinates to one of the */ 1359 /* current standard widths. */ 1360 1361 static FT_Pos af_cjk_snap_width(AF_Width widths,FT_UInt count,FT_Pos width)1362 af_cjk_snap_width( AF_Width widths, 1363 FT_UInt count, 1364 FT_Pos width ) 1365 { 1366 FT_UInt n; 1367 FT_Pos best = 64 + 32 + 2; 1368 FT_Pos reference = width; 1369 FT_Pos scaled; 1370 1371 1372 for ( n = 0; n < count; n++ ) 1373 { 1374 FT_Pos w; 1375 FT_Pos dist; 1376 1377 1378 w = widths[n].cur; 1379 dist = width - w; 1380 if ( dist < 0 ) 1381 dist = -dist; 1382 if ( dist < best ) 1383 { 1384 best = dist; 1385 reference = w; 1386 } 1387 } 1388 1389 scaled = FT_PIX_ROUND( reference ); 1390 1391 if ( width >= reference ) 1392 { 1393 if ( width < scaled + 48 ) 1394 width = reference; 1395 } 1396 else 1397 { 1398 if ( width > scaled - 48 ) 1399 width = reference; 1400 } 1401 1402 return width; 1403 } 1404 1405 1406 /* Compute the snapped width of a given stem. */ 1407 /* There is a lot of voodoo in this function; changing the hard-coded */ 1408 /* parameters influence the whole hinting process. */ 1409 1410 static FT_Pos af_cjk_compute_stem_width(AF_GlyphHints hints,AF_Dimension dim,FT_Pos width,FT_UInt base_flags,FT_UInt stem_flags)1411 af_cjk_compute_stem_width( AF_GlyphHints hints, 1412 AF_Dimension dim, 1413 FT_Pos width, 1414 FT_UInt base_flags, 1415 FT_UInt stem_flags ) 1416 { 1417 AF_CJKMetrics metrics = (AF_CJKMetrics)hints->metrics; 1418 AF_CJKAxis axis = &metrics->axis[dim]; 1419 FT_Pos dist = width; 1420 FT_Int sign = 0; 1421 FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT ); 1422 1423 FT_UNUSED( base_flags ); 1424 FT_UNUSED( stem_flags ); 1425 1426 1427 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1428 return width; 1429 1430 if ( dist < 0 ) 1431 { 1432 dist = -width; 1433 sign = 1; 1434 } 1435 1436 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1437 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1438 { 1439 /* smooth hinting process: very lightly quantize the stem width */ 1440 1441 if ( axis->width_count > 0 ) 1442 { 1443 if ( FT_ABS( dist - axis->widths[0].cur ) < 40 ) 1444 { 1445 dist = axis->widths[0].cur; 1446 if ( dist < 48 ) 1447 dist = 48; 1448 1449 goto Done_Width; 1450 } 1451 } 1452 1453 if ( dist < 54 ) 1454 dist += ( 54 - dist ) / 2 ; 1455 else if ( dist < 3 * 64 ) 1456 { 1457 FT_Pos delta; 1458 1459 1460 delta = dist & 63; 1461 dist &= -64; 1462 1463 if ( delta < 10 ) 1464 dist += delta; 1465 else if ( delta < 22 ) 1466 dist += 10; 1467 else if ( delta < 42 ) 1468 dist += delta; 1469 else if ( delta < 54 ) 1470 dist += 54; 1471 else 1472 dist += delta; 1473 } 1474 } 1475 else 1476 { 1477 /* strong hinting process: snap the stem width to integer pixels */ 1478 1479 dist = af_cjk_snap_width( axis->widths, axis->width_count, dist ); 1480 1481 if ( vertical ) 1482 { 1483 /* in the case of vertical hinting, always round */ 1484 /* the stem heights to integer pixels */ 1485 1486 if ( dist >= 64 ) 1487 dist = ( dist + 16 ) & ~63; 1488 else 1489 dist = 64; 1490 } 1491 else 1492 { 1493 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1494 { 1495 /* monochrome horizontal hinting: snap widths to integer pixels */ 1496 /* with a different threshold */ 1497 1498 if ( dist < 64 ) 1499 dist = 64; 1500 else 1501 dist = ( dist + 32 ) & ~63; 1502 } 1503 else 1504 { 1505 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1506 /* approach: we strengthen small stems, round stems whose size */ 1507 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1508 1509 if ( dist < 48 ) 1510 dist = ( dist + 64 ) >> 1; 1511 1512 else if ( dist < 128 ) 1513 dist = ( dist + 22 ) & ~63; 1514 else 1515 /* round otherwise to prevent color fringes in LCD mode */ 1516 dist = ( dist + 32 ) & ~63; 1517 } 1518 } 1519 } 1520 1521 Done_Width: 1522 if ( sign ) 1523 dist = -dist; 1524 1525 return dist; 1526 } 1527 1528 1529 /* Align one stem edge relative to the previous stem edge. */ 1530 1531 static void af_cjk_align_linked_edge(AF_GlyphHints hints,AF_Dimension dim,AF_Edge base_edge,AF_Edge stem_edge)1532 af_cjk_align_linked_edge( AF_GlyphHints hints, 1533 AF_Dimension dim, 1534 AF_Edge base_edge, 1535 AF_Edge stem_edge ) 1536 { 1537 FT_Pos dist = stem_edge->opos - base_edge->opos; 1538 1539 FT_Pos fitted_width = af_cjk_compute_stem_width( hints, dim, dist, 1540 base_edge->flags, 1541 stem_edge->flags ); 1542 1543 1544 stem_edge->pos = base_edge->pos + fitted_width; 1545 1546 FT_TRACE5(( " CJKLINK: edge %d @%d (opos=%.2f) linked to %.2f," 1547 " dist was %.2f, now %.2f\n", 1548 stem_edge - hints->axis[dim].edges, stem_edge->fpos, 1549 stem_edge->opos / 64.0, stem_edge->pos / 64.0, 1550 dist / 64.0, fitted_width / 64.0 )); 1551 } 1552 1553 1554 /* Shift the coordinates of the `serif' edge by the same amount */ 1555 /* as the corresponding `base' edge has been moved already. */ 1556 1557 static void af_cjk_align_serif_edge(AF_GlyphHints hints,AF_Edge base,AF_Edge serif)1558 af_cjk_align_serif_edge( AF_GlyphHints hints, 1559 AF_Edge base, 1560 AF_Edge serif ) 1561 { 1562 FT_UNUSED( hints ); 1563 1564 serif->pos = base->pos + ( serif->opos - base->opos ); 1565 } 1566 1567 1568 /*************************************************************************/ 1569 /*************************************************************************/ 1570 /*************************************************************************/ 1571 /**** ****/ 1572 /**** E D G E H I N T I N G ****/ 1573 /**** ****/ 1574 /*************************************************************************/ 1575 /*************************************************************************/ 1576 /*************************************************************************/ 1577 1578 1579 #define AF_LIGHT_MODE_MAX_HORZ_GAP 9 1580 #define AF_LIGHT_MODE_MAX_VERT_GAP 15 1581 #define AF_LIGHT_MODE_MAX_DELTA_ABS 14 1582 1583 1584 static FT_Pos af_hint_normal_stem(AF_GlyphHints hints,AF_Edge edge,AF_Edge edge2,FT_Pos anchor,AF_Dimension dim)1585 af_hint_normal_stem( AF_GlyphHints hints, 1586 AF_Edge edge, 1587 AF_Edge edge2, 1588 FT_Pos anchor, 1589 AF_Dimension dim ) 1590 { 1591 FT_Pos org_len, cur_len, org_center; 1592 FT_Pos cur_pos1, cur_pos2; 1593 FT_Pos d_off1, u_off1, d_off2, u_off2, delta; 1594 FT_Pos offset; 1595 FT_Pos threshold = 64; 1596 1597 1598 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1599 { 1600 if ( ( edge->flags & AF_EDGE_ROUND ) && 1601 ( edge2->flags & AF_EDGE_ROUND ) ) 1602 { 1603 if ( dim == AF_DIMENSION_VERT ) 1604 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP; 1605 else 1606 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP; 1607 } 1608 else 1609 { 1610 if ( dim == AF_DIMENSION_VERT ) 1611 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3; 1612 else 1613 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3; 1614 } 1615 } 1616 1617 org_len = edge2->opos - edge->opos; 1618 cur_len = af_cjk_compute_stem_width( hints, dim, org_len, 1619 edge->flags, 1620 edge2->flags ); 1621 1622 org_center = ( edge->opos + edge2->opos ) / 2 + anchor; 1623 cur_pos1 = org_center - cur_len / 2; 1624 cur_pos2 = cur_pos1 + cur_len; 1625 d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 ); 1626 d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 ); 1627 u_off1 = 64 - d_off1; 1628 u_off2 = 64 - d_off2; 1629 delta = 0; 1630 1631 1632 if ( d_off1 == 0 || d_off2 == 0 ) 1633 goto Exit; 1634 1635 if ( cur_len <= threshold ) 1636 { 1637 if ( d_off2 < cur_len ) 1638 { 1639 if ( u_off1 <= d_off2 ) 1640 delta = u_off1; 1641 else 1642 delta = -d_off2; 1643 } 1644 1645 goto Exit; 1646 } 1647 1648 if ( threshold < 64 ) 1649 { 1650 if ( d_off1 >= threshold || u_off1 >= threshold || 1651 d_off2 >= threshold || u_off2 >= threshold ) 1652 goto Exit; 1653 } 1654 1655 offset = cur_len & 63; 1656 1657 if ( offset < 32 ) 1658 { 1659 if ( u_off1 <= offset || d_off2 <= offset ) 1660 goto Exit; 1661 } 1662 else 1663 offset = 64 - threshold; 1664 1665 d_off1 = threshold - u_off1; 1666 u_off1 = u_off1 - offset; 1667 u_off2 = threshold - d_off2; 1668 d_off2 = d_off2 - offset; 1669 1670 if ( d_off1 <= u_off1 ) 1671 u_off1 = -d_off1; 1672 1673 if ( d_off2 <= u_off2 ) 1674 u_off2 = -d_off2; 1675 1676 if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) ) 1677 delta = u_off1; 1678 else 1679 delta = u_off2; 1680 1681 Exit: 1682 1683 #if 1 1684 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1685 { 1686 if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS ) 1687 delta = AF_LIGHT_MODE_MAX_DELTA_ABS; 1688 else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS ) 1689 delta = -AF_LIGHT_MODE_MAX_DELTA_ABS; 1690 } 1691 #endif 1692 1693 cur_pos1 += delta; 1694 1695 if ( edge->opos < edge2->opos ) 1696 { 1697 edge->pos = cur_pos1; 1698 edge2->pos = cur_pos1 + cur_len; 1699 } 1700 else 1701 { 1702 edge->pos = cur_pos1 + cur_len; 1703 edge2->pos = cur_pos1; 1704 } 1705 1706 return delta; 1707 } 1708 1709 1710 /* The main grid-fitting routine. */ 1711 1712 static void af_cjk_hint_edges(AF_GlyphHints hints,AF_Dimension dim)1713 af_cjk_hint_edges( AF_GlyphHints hints, 1714 AF_Dimension dim ) 1715 { 1716 AF_AxisHints axis = &hints->axis[dim]; 1717 AF_Edge edges = axis->edges; 1718 AF_Edge edge_limit = edges + axis->num_edges; 1719 FT_PtrDist n_edges; 1720 AF_Edge edge; 1721 AF_Edge anchor = NULL; 1722 FT_Pos delta = 0; 1723 FT_Int skipped = 0; 1724 FT_Bool has_last_stem = FALSE; 1725 FT_Pos last_stem_pos = 0; 1726 1727 #ifdef FT_DEBUG_LEVEL_TRACE 1728 FT_UInt num_actions = 0; 1729 #endif 1730 1731 1732 FT_TRACE5(( "cjk %s edge hinting (style `%s')\n", 1733 dim == AF_DIMENSION_VERT ? "horizontal" : "vertical", 1734 af_style_names[hints->metrics->style_class->style] )); 1735 1736 /* we begin by aligning all stems relative to the blue zone */ 1737 1738 if ( AF_HINTS_DO_BLUES( hints ) ) 1739 { 1740 for ( edge = edges; edge < edge_limit; edge++ ) 1741 { 1742 AF_Width blue; 1743 AF_Edge edge1, edge2; 1744 1745 1746 if ( edge->flags & AF_EDGE_DONE ) 1747 continue; 1748 1749 blue = edge->blue_edge; 1750 edge1 = NULL; 1751 edge2 = edge->link; 1752 1753 if ( blue ) 1754 { 1755 edge1 = edge; 1756 } 1757 else if ( edge2 && edge2->blue_edge ) 1758 { 1759 blue = edge2->blue_edge; 1760 edge1 = edge2; 1761 edge2 = edge; 1762 } 1763 1764 if ( !edge1 ) 1765 continue; 1766 1767 #ifdef FT_DEBUG_LEVEL_TRACE 1768 FT_TRACE5(( " CJKBLUE: edge %d @%d (opos=%.2f) snapped to %.2f," 1769 " was %.2f\n", 1770 edge1 - edges, edge1->fpos, edge1->opos / 64.0, 1771 blue->fit / 64.0, edge1->pos / 64.0 )); 1772 1773 num_actions++; 1774 #endif 1775 1776 edge1->pos = blue->fit; 1777 edge1->flags |= AF_EDGE_DONE; 1778 1779 if ( edge2 && !edge2->blue_edge ) 1780 { 1781 af_cjk_align_linked_edge( hints, dim, edge1, edge2 ); 1782 edge2->flags |= AF_EDGE_DONE; 1783 1784 #ifdef FT_DEBUG_LEVEL_TRACE 1785 num_actions++; 1786 #endif 1787 } 1788 1789 if ( !anchor ) 1790 anchor = edge; 1791 } 1792 } 1793 1794 /* now we align all stem edges. */ 1795 for ( edge = edges; edge < edge_limit; edge++ ) 1796 { 1797 AF_Edge edge2; 1798 1799 1800 if ( edge->flags & AF_EDGE_DONE ) 1801 continue; 1802 1803 /* skip all non-stem edges */ 1804 edge2 = edge->link; 1805 if ( !edge2 ) 1806 { 1807 skipped++; 1808 continue; 1809 } 1810 1811 /* Some CJK characters have so many stems that 1812 * the hinter is likely to merge two adjacent ones. 1813 * To solve this problem, if either edge of a stem 1814 * is too close to the previous one, we avoid 1815 * aligning the two edges, but rather interpolate 1816 * their locations at the end of this function in 1817 * order to preserve the space between the stems. 1818 */ 1819 if ( has_last_stem && 1820 ( edge->pos < last_stem_pos + 64 || 1821 edge2->pos < last_stem_pos + 64 ) ) 1822 { 1823 skipped++; 1824 continue; 1825 } 1826 1827 /* now align the stem */ 1828 1829 /* this should not happen, but it's better to be safe */ 1830 if ( edge2->blue_edge ) 1831 { 1832 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1833 1834 af_cjk_align_linked_edge( hints, dim, edge2, edge ); 1835 edge->flags |= AF_EDGE_DONE; 1836 1837 #ifdef FT_DEBUG_LEVEL_TRACE 1838 num_actions++; 1839 #endif 1840 1841 continue; 1842 } 1843 1844 if ( edge2 < edge ) 1845 { 1846 af_cjk_align_linked_edge( hints, dim, edge2, edge ); 1847 edge->flags |= AF_EDGE_DONE; 1848 1849 #ifdef FT_DEBUG_LEVEL_TRACE 1850 num_actions++; 1851 #endif 1852 1853 /* We rarely reaches here it seems; 1854 * usually the two edges belonging 1855 * to one stem are marked as DONE together 1856 */ 1857 has_last_stem = TRUE; 1858 last_stem_pos = edge->pos; 1859 continue; 1860 } 1861 1862 if ( dim != AF_DIMENSION_VERT && !anchor ) 1863 { 1864 1865 #if 0 1866 if ( fixedpitch ) 1867 { 1868 AF_Edge left = edge; 1869 AF_Edge right = edge_limit - 1; 1870 AF_EdgeRec left1, left2, right1, right2; 1871 FT_Pos target, center1, center2; 1872 FT_Pos delta1, delta2, d1, d2; 1873 1874 1875 while ( right > left && !right->link ) 1876 right--; 1877 1878 left1 = *left; 1879 left2 = *left->link; 1880 right1 = *right->link; 1881 right2 = *right; 1882 1883 delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2; 1884 target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16; 1885 1886 delta1 = delta; 1887 delta1 += af_hint_normal_stem( hints, left, left->link, 1888 delta1, 0 ); 1889 1890 if ( left->link != right ) 1891 af_hint_normal_stem( hints, right->link, right, delta1, 0 ); 1892 1893 center1 = left->pos + ( right->pos - left->pos ) / 2; 1894 1895 if ( center1 >= target ) 1896 delta2 = delta - 32; 1897 else 1898 delta2 = delta + 32; 1899 1900 delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 ); 1901 1902 if ( delta1 != delta2 ) 1903 { 1904 if ( left->link != right ) 1905 af_hint_normal_stem( hints, &right1, &right2, delta2, 0 ); 1906 1907 center2 = left1.pos + ( right2.pos - left1.pos ) / 2; 1908 1909 d1 = center1 - target; 1910 d2 = center2 - target; 1911 1912 if ( FT_ABS( d2 ) < FT_ABS( d1 ) ) 1913 { 1914 left->pos = left1.pos; 1915 left->link->pos = left2.pos; 1916 1917 if ( left->link != right ) 1918 { 1919 right->link->pos = right1.pos; 1920 right->pos = right2.pos; 1921 } 1922 1923 delta1 = delta2; 1924 } 1925 } 1926 1927 delta = delta1; 1928 right->link->flags |= AF_EDGE_DONE; 1929 right->flags |= AF_EDGE_DONE; 1930 } 1931 else 1932 1933 #endif /* 0 */ 1934 1935 delta = af_hint_normal_stem( hints, edge, edge2, 0, 1936 AF_DIMENSION_HORZ ); 1937 } 1938 else 1939 af_hint_normal_stem( hints, edge, edge2, delta, dim ); 1940 1941 #if 0 1942 printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n", 1943 edge - edges, edge2 - edges, 1944 ( edge->pos - edge->opos ) / 64.0, 1945 ( edge2->pos - edge2->opos ) / 64.0 ); 1946 #endif 1947 1948 anchor = edge; 1949 edge->flags |= AF_EDGE_DONE; 1950 edge2->flags |= AF_EDGE_DONE; 1951 has_last_stem = TRUE; 1952 last_stem_pos = edge2->pos; 1953 } 1954 1955 /* make sure that lowercase m's maintain their symmetry */ 1956 1957 /* In general, lowercase m's have six vertical edges if they are sans */ 1958 /* serif, or twelve if they are with serifs. This implementation is */ 1959 /* based on that assumption, and seems to work very well with most */ 1960 /* faces. However, if for a certain face this assumption is not */ 1961 /* true, the m is just rendered like before. In addition, any stem */ 1962 /* correction will only be applied to symmetrical glyphs (even if the */ 1963 /* glyph is not an m), so the potential for unwanted distortion is */ 1964 /* relatively low. */ 1965 1966 /* We don't handle horizontal edges since we can't easily assure that */ 1967 /* the third (lowest) stem aligns with the base line; it might end up */ 1968 /* one pixel higher or lower. */ 1969 1970 n_edges = edge_limit - edges; 1971 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 1972 { 1973 AF_Edge edge1, edge2, edge3; 1974 FT_Pos dist1, dist2, span; 1975 1976 1977 if ( n_edges == 6 ) 1978 { 1979 edge1 = edges; 1980 edge2 = edges + 2; 1981 edge3 = edges + 4; 1982 } 1983 else 1984 { 1985 edge1 = edges + 1; 1986 edge2 = edges + 5; 1987 edge3 = edges + 9; 1988 } 1989 1990 dist1 = edge2->opos - edge1->opos; 1991 dist2 = edge3->opos - edge2->opos; 1992 1993 span = dist1 - dist2; 1994 if ( span < 0 ) 1995 span = -span; 1996 1997 if ( edge1->link == edge1 + 1 && 1998 edge2->link == edge2 + 1 && 1999 edge3->link == edge3 + 1 && span < 8 ) 2000 { 2001 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2002 edge3->pos -= delta; 2003 if ( edge3->link ) 2004 edge3->link->pos -= delta; 2005 2006 /* move the serifs along with the stem */ 2007 if ( n_edges == 12 ) 2008 { 2009 ( edges + 8 )->pos -= delta; 2010 ( edges + 11 )->pos -= delta; 2011 } 2012 2013 edge3->flags |= AF_EDGE_DONE; 2014 if ( edge3->link ) 2015 edge3->link->flags |= AF_EDGE_DONE; 2016 } 2017 } 2018 2019 if ( !skipped ) 2020 goto Exit; 2021 2022 /* 2023 * now hint the remaining edges (serifs and single) in order 2024 * to complete our processing 2025 */ 2026 for ( edge = edges; edge < edge_limit; edge++ ) 2027 { 2028 if ( edge->flags & AF_EDGE_DONE ) 2029 continue; 2030 2031 if ( edge->serif ) 2032 { 2033 af_cjk_align_serif_edge( hints, edge->serif, edge ); 2034 edge->flags |= AF_EDGE_DONE; 2035 skipped--; 2036 } 2037 } 2038 2039 if ( !skipped ) 2040 goto Exit; 2041 2042 for ( edge = edges; edge < edge_limit; edge++ ) 2043 { 2044 AF_Edge before, after; 2045 2046 2047 if ( edge->flags & AF_EDGE_DONE ) 2048 continue; 2049 2050 before = after = edge; 2051 2052 while ( --before >= edges ) 2053 if ( before->flags & AF_EDGE_DONE ) 2054 break; 2055 2056 while ( ++after < edge_limit ) 2057 if ( after->flags & AF_EDGE_DONE ) 2058 break; 2059 2060 if ( before >= edges || after < edge_limit ) 2061 { 2062 if ( before < edges ) 2063 af_cjk_align_serif_edge( hints, after, edge ); 2064 else if ( after >= edge_limit ) 2065 af_cjk_align_serif_edge( hints, before, edge ); 2066 else 2067 { 2068 if ( after->fpos == before->fpos ) 2069 edge->pos = before->pos; 2070 else 2071 edge->pos = before->pos + 2072 FT_MulDiv( edge->fpos - before->fpos, 2073 after->pos - before->pos, 2074 after->fpos - before->fpos ); 2075 } 2076 } 2077 } 2078 2079 Exit: 2080 2081 #ifdef FT_DEBUG_LEVEL_TRACE 2082 if ( !num_actions ) 2083 FT_TRACE5(( " (none)\n" )); 2084 FT_TRACE5(( "\n" )); 2085 #endif 2086 2087 return; 2088 } 2089 2090 2091 static void af_cjk_align_edge_points(AF_GlyphHints hints,AF_Dimension dim)2092 af_cjk_align_edge_points( AF_GlyphHints hints, 2093 AF_Dimension dim ) 2094 { 2095 AF_AxisHints axis = & hints->axis[dim]; 2096 AF_Edge edges = axis->edges; 2097 AF_Edge edge_limit = edges + axis->num_edges; 2098 AF_Edge edge; 2099 FT_Bool snapping; 2100 2101 2102 snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ && 2103 AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) || 2104 ( dim == AF_DIMENSION_VERT && 2105 AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ); 2106 2107 for ( edge = edges; edge < edge_limit; edge++ ) 2108 { 2109 /* move the points of each segment */ 2110 /* in each edge to the edge's position */ 2111 AF_Segment seg = edge->first; 2112 2113 2114 if ( snapping ) 2115 { 2116 do 2117 { 2118 AF_Point point = seg->first; 2119 2120 2121 for (;;) 2122 { 2123 if ( dim == AF_DIMENSION_HORZ ) 2124 { 2125 point->x = edge->pos; 2126 point->flags |= AF_FLAG_TOUCH_X; 2127 } 2128 else 2129 { 2130 point->y = edge->pos; 2131 point->flags |= AF_FLAG_TOUCH_Y; 2132 } 2133 2134 if ( point == seg->last ) 2135 break; 2136 2137 point = point->next; 2138 } 2139 2140 seg = seg->edge_next; 2141 2142 } while ( seg != edge->first ); 2143 } 2144 else 2145 { 2146 FT_Pos delta = edge->pos - edge->opos; 2147 2148 2149 do 2150 { 2151 AF_Point point = seg->first; 2152 2153 2154 for (;;) 2155 { 2156 if ( dim == AF_DIMENSION_HORZ ) 2157 { 2158 point->x += delta; 2159 point->flags |= AF_FLAG_TOUCH_X; 2160 } 2161 else 2162 { 2163 point->y += delta; 2164 point->flags |= AF_FLAG_TOUCH_Y; 2165 } 2166 2167 if ( point == seg->last ) 2168 break; 2169 2170 point = point->next; 2171 } 2172 2173 seg = seg->edge_next; 2174 2175 } while ( seg != edge->first ); 2176 } 2177 } 2178 } 2179 2180 2181 /* Apply the complete hinting algorithm to a CJK glyph. */ 2182 2183 FT_LOCAL_DEF( FT_Error ) af_cjk_hints_apply(FT_UInt glyph_index,AF_GlyphHints hints,FT_Outline * outline,AF_CJKMetrics metrics)2184 af_cjk_hints_apply( FT_UInt glyph_index, 2185 AF_GlyphHints hints, 2186 FT_Outline* outline, 2187 AF_CJKMetrics metrics ) 2188 { 2189 FT_Error error; 2190 int dim; 2191 2192 FT_UNUSED( metrics ); 2193 FT_UNUSED( glyph_index ); 2194 2195 2196 error = af_glyph_hints_reload( hints, outline ); 2197 if ( error ) 2198 goto Exit; 2199 2200 /* analyze glyph outline */ 2201 #ifdef AF_CONFIG_OPTION_USE_WARPER 2202 if ( ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT && 2203 AF_HINTS_DO_WARP( hints ) ) || 2204 AF_HINTS_DO_HORIZONTAL( hints ) ) 2205 #else 2206 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2207 #endif 2208 { 2209 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2210 if ( error ) 2211 goto Exit; 2212 2213 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_HORZ ); 2214 } 2215 2216 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2217 { 2218 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT ); 2219 if ( error ) 2220 goto Exit; 2221 2222 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_VERT ); 2223 } 2224 2225 /* grid-fit the outline */ 2226 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2227 { 2228 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2229 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2230 { 2231 2232 #ifdef AF_CONFIG_OPTION_USE_WARPER 2233 if ( dim == AF_DIMENSION_HORZ && 2234 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT && 2235 AF_HINTS_DO_WARP( hints ) ) 2236 { 2237 AF_WarperRec warper; 2238 FT_Fixed scale; 2239 FT_Pos delta; 2240 2241 2242 af_warper_compute( &warper, hints, (AF_Dimension)dim, 2243 &scale, &delta ); 2244 af_glyph_hints_scale_dim( hints, (AF_Dimension)dim, 2245 scale, delta ); 2246 continue; 2247 } 2248 #endif /* AF_CONFIG_OPTION_USE_WARPER */ 2249 2250 af_cjk_hint_edges( hints, (AF_Dimension)dim ); 2251 af_cjk_align_edge_points( hints, (AF_Dimension)dim ); 2252 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2253 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2254 } 2255 } 2256 2257 af_glyph_hints_save( hints, outline ); 2258 2259 Exit: 2260 return error; 2261 } 2262 2263 2264 /*************************************************************************/ 2265 /*************************************************************************/ 2266 /***** *****/ 2267 /***** C J K S C R I P T C L A S S *****/ 2268 /***** *****/ 2269 /*************************************************************************/ 2270 /*************************************************************************/ 2271 2272 2273 AF_DEFINE_WRITING_SYSTEM_CLASS( 2274 af_cjk_writing_system_class, 2275 2276 AF_WRITING_SYSTEM_CJK, 2277 2278 sizeof ( AF_CJKMetricsRec ), 2279 2280 (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init, 2281 (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale, 2282 (AF_WritingSystem_DoneMetricsFunc) NULL, 2283 2284 (AF_WritingSystem_InitHintsFunc) af_cjk_hints_init, 2285 (AF_WritingSystem_ApplyHintsFunc) af_cjk_hints_apply 2286 ) 2287 2288 2289 #else /* !AF_CONFIG_OPTION_CJK */ 2290 2291 2292 AF_DEFINE_WRITING_SYSTEM_CLASS( 2293 af_cjk_writing_system_class, 2294 2295 AF_WRITING_SYSTEM_CJK, 2296 2297 sizeof ( AF_CJKMetricsRec ), 2298 2299 (AF_WritingSystem_InitMetricsFunc) NULL, 2300 (AF_WritingSystem_ScaleMetricsFunc)NULL, 2301 (AF_WritingSystem_DoneMetricsFunc) NULL, 2302 2303 (AF_WritingSystem_InitHintsFunc) NULL, 2304 (AF_WritingSystem_ApplyHintsFunc) NULL 2305 ) 2306 2307 2308 #endif /* !AF_CONFIG_OPTION_CJK */ 2309 2310 2311 /* END */ 2312