1 /***************************************************************************/ 2 /* */ 3 /* afcjk.c */ 4 /* */ 5 /* Auto-fitter hinting routines for CJK writing system (body). */ 6 /* */ 7 /* Copyright 2006-2013 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 /* 19 * 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 (AF_Dimension)dim ); 182 183 seg = axhints->segments; 184 limit = seg + axhints->num_segments; 185 186 for ( ; seg < limit; seg++ ) 187 { 188 link = seg->link; 189 190 /* we only consider stem segments there! */ 191 if ( link && link->link == seg && link > seg ) 192 { 193 FT_Pos dist; 194 195 196 dist = seg->pos - link->pos; 197 if ( dist < 0 ) 198 dist = -dist; 199 200 if ( num_widths < AF_CJK_MAX_WIDTHS ) 201 axis->widths[num_widths++].org = dist; 202 } 203 } 204 205 /* this also replaces multiple almost identical stem widths */ 206 /* with a single one (the value 100 is heuristic) */ 207 af_sort_and_quantize_widths( &num_widths, axis->widths, 208 dummy->units_per_em / 100 ); 209 axis->width_count = num_widths; 210 } 211 212 Exit: 213 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 214 { 215 AF_CJKAxis axis = &metrics->axis[dim]; 216 FT_Pos stdw; 217 218 219 stdw = ( axis->width_count > 0 ) ? axis->widths[0].org 220 : AF_LATIN_CONSTANT( metrics, 50 ); 221 222 /* let's try 20% of the smallest width */ 223 axis->edge_distance_threshold = stdw / 5; 224 axis->standard_width = stdw; 225 axis->extra_light = 0; 226 227 #ifdef FT_DEBUG_LEVEL_TRACE 228 { 229 FT_UInt i; 230 231 232 FT_TRACE5(( "%s widths:\n", 233 dim == AF_DIMENSION_VERT ? "horizontal" 234 : "vertical" )); 235 236 FT_TRACE5(( " %d (standard)", axis->standard_width )); 237 for ( i = 1; i < axis->width_count; i++ ) 238 FT_TRACE5(( " %d", axis->widths[i].org )); 239 240 FT_TRACE5(( "\n" )); 241 } 242 #endif 243 } 244 } 245 246 FT_TRACE5(( "\n" )); 247 248 af_glyph_hints_done( hints ); 249 } 250 251 252 /* Find all blue zones. */ 253 254 static void af_cjk_metrics_init_blues(AF_CJKMetrics metrics,FT_Face face)255 af_cjk_metrics_init_blues( AF_CJKMetrics metrics, 256 FT_Face face ) 257 { 258 FT_Pos fills[AF_BLUE_STRING_MAX_LEN]; 259 FT_Pos flats[AF_BLUE_STRING_MAX_LEN]; 260 261 FT_Int num_fills; 262 FT_Int num_flats; 263 264 AF_CJKBlue blue; 265 FT_Error error; 266 AF_CJKAxis axis; 267 FT_Outline outline; 268 269 AF_StyleClass sc = metrics->root.style_class; 270 271 AF_Blue_Stringset bss = sc->blue_stringset; 272 const AF_Blue_StringRec* bs = &af_blue_stringsets[bss]; 273 274 #ifdef FT_DEBUG_LEVEL_TRACE 275 FT_String* cjk_blue_name[4] = 276 { 277 (FT_String*)"bottom", /* -- , -- */ 278 (FT_String*)"top", /* -- , TOP */ 279 (FT_String*)"left", /* HORIZ, -- */ 280 (FT_String*)"right" /* HORIZ, TOP */ 281 }; 282 283 FT_String* cjk_blue_type_name[2] = 284 { 285 (FT_String*)"unfilled", /* -- */ 286 (FT_String*)"filled" /* FILL */ 287 }; 288 #endif 289 290 291 /* we walk over the blue character strings as specified in the */ 292 /* style's entry in the `af_blue_stringset' array, computing its */ 293 /* extremum points (depending on the string properties) */ 294 295 FT_TRACE5(( "cjk blue zones computation\n" 296 "==========================\n" 297 "\n" )); 298 299 for ( ; bs->string != AF_BLUE_STRING_MAX; bs++ ) 300 { 301 const char* p = &af_blue_strings[bs->string]; 302 FT_Pos* blue_ref; 303 FT_Pos* blue_shoot; 304 305 306 if ( AF_CJK_IS_HORIZ_BLUE( bs ) ) 307 axis = &metrics->axis[AF_DIMENSION_HORZ]; 308 else 309 axis = &metrics->axis[AF_DIMENSION_VERT]; 310 311 FT_TRACE5(( "blue zone %d:\n", axis->blue_count )); 312 313 num_fills = 0; 314 num_flats = 0; 315 316 FT_TRACE5(( " cjk blue %s/%s\n", 317 cjk_blue_name[AF_CJK_IS_HORIZ_BLUE( bs ) | 318 AF_CJK_IS_TOP_BLUE( bs ) ], 319 cjk_blue_type_name[!!AF_CJK_IS_FILLED_BLUE( bs )] )); 320 321 while ( *p ) 322 { 323 FT_ULong ch; 324 FT_ULong glyph_index; 325 FT_Long y_offset; 326 FT_Pos best_pos; /* same as points.y or points.x, resp. */ 327 FT_Int best_point; 328 FT_Vector* points; 329 330 331 GET_UTF8_CHAR( ch, p ); 332 333 /* load the character in the face -- skip unknown or empty ones */ 334 af_get_char_index( &metrics->root, ch, &glyph_index, &y_offset ); 335 if ( glyph_index == 0 ) 336 { 337 FT_TRACE5(( " U+%04lX unavailable\n", ch )); 338 continue; 339 } 340 341 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 342 outline = face->glyph->outline; 343 if ( error || outline.n_points <= 0 ) 344 { 345 FT_TRACE5(( " U+%04lX contains no outlines\n", ch )); 346 continue; 347 } 348 349 /* now compute min or max point indices and coordinates */ 350 points = outline.points; 351 best_point = -1; 352 best_pos = 0; /* make compiler happy */ 353 354 { 355 FT_Int nn; 356 FT_Int first = 0; 357 FT_Int last = -1; 358 359 360 for ( nn = 0; nn < outline.n_contours; first = last + 1, nn++ ) 361 { 362 FT_Int pp; 363 364 365 last = outline.contours[nn]; 366 367 /* Avoid single-point contours since they are never rasterized. */ 368 /* In some fonts, they correspond to mark attachment points */ 369 /* which are way outside of the glyph's real outline. */ 370 if ( last <= first ) 371 continue; 372 373 if ( AF_CJK_IS_HORIZ_BLUE( bs ) ) 374 { 375 if ( AF_CJK_IS_RIGHT_BLUE( bs ) ) 376 { 377 for ( pp = first; pp <= last; pp++ ) 378 if ( best_point < 0 || points[pp].x > best_pos ) 379 { 380 best_point = pp; 381 best_pos = points[pp].x; 382 } 383 } 384 else 385 { 386 for ( pp = first; pp <= last; pp++ ) 387 if ( best_point < 0 || points[pp].x < best_pos ) 388 { 389 best_point = pp; 390 best_pos = points[pp].x; 391 } 392 } 393 } 394 else 395 { 396 if ( AF_CJK_IS_TOP_BLUE( bs ) ) 397 { 398 for ( pp = first; pp <= last; pp++ ) 399 if ( best_point < 0 || points[pp].y > best_pos ) 400 { 401 best_point = pp; 402 best_pos = points[pp].y; 403 } 404 } 405 else 406 { 407 for ( pp = first; pp <= last; pp++ ) 408 if ( best_point < 0 || points[pp].y < best_pos ) 409 { 410 best_point = pp; 411 best_pos = points[pp].y; 412 } 413 } 414 } 415 } 416 417 FT_TRACE5(( " U+%04lX: best_pos = %5ld\n", ch, best_pos )); 418 } 419 420 if ( AF_CJK_IS_FILLED_BLUE( bs ) ) 421 fills[num_fills++] = best_pos; 422 else 423 flats[num_flats++] = best_pos; 424 } 425 426 if ( num_flats == 0 && num_fills == 0 ) 427 { 428 /* 429 * we couldn't find a single glyph to compute this blue zone, 430 * we will simply ignore it then 431 */ 432 FT_TRACE5(( " empty\n" )); 433 continue; 434 } 435 436 /* we have computed the contents of the `fill' and `flats' tables, */ 437 /* now determine the reference position of the blue zone -- */ 438 /* we simply take the median value after a simple sort */ 439 af_sort_pos( num_flats, flats ); 440 af_sort_pos( num_fills, fills ); 441 442 blue = &axis->blues[axis->blue_count]; 443 blue_ref = &blue->ref.org; 444 blue_shoot = &blue->shoot.org; 445 446 axis->blue_count++; 447 448 if ( num_flats == 0 ) 449 { 450 *blue_ref = 451 *blue_shoot = fills[num_fills / 2]; 452 } 453 else if ( num_fills == 0 ) 454 { 455 *blue_ref = 456 *blue_shoot = flats[num_flats / 2]; 457 } 458 else 459 { 460 *blue_ref = fills[num_fills / 2]; 461 *blue_shoot = flats[num_flats / 2]; 462 } 463 464 /* make sure blue_ref >= blue_shoot for top/right or */ 465 /* vice versa for bottom/left */ 466 if ( *blue_shoot != *blue_ref ) 467 { 468 FT_Pos ref = *blue_ref; 469 FT_Pos shoot = *blue_shoot; 470 FT_Bool under_ref = FT_BOOL( shoot < ref ); 471 472 473 /* AF_CJK_IS_TOP_BLUE covers `right' and `top' */ 474 if ( AF_CJK_IS_TOP_BLUE( bs ) ^ under_ref ) 475 { 476 *blue_ref = 477 *blue_shoot = ( shoot + ref ) / 2; 478 479 FT_TRACE5(( " [overshoot smaller than reference," 480 " taking mean value]\n" )); 481 } 482 } 483 484 blue->flags = 0; 485 if ( AF_CJK_IS_TOP_BLUE( bs ) ) 486 blue->flags |= AF_CJK_BLUE_TOP; 487 488 FT_TRACE5(( " -> reference = %ld\n" 489 " overshoot = %ld\n", 490 *blue_ref, *blue_shoot )); 491 } 492 493 FT_TRACE5(( "\n" )); 494 495 return; 496 } 497 498 499 /* Basically the Latin version with type AF_CJKMetrics for metrics. */ 500 501 FT_LOCAL_DEF( void ) af_cjk_metrics_check_digits(AF_CJKMetrics metrics,FT_Face face)502 af_cjk_metrics_check_digits( AF_CJKMetrics metrics, 503 FT_Face face ) 504 { 505 FT_UInt i; 506 FT_Bool started = 0, same_width = 1; 507 FT_Fixed advance, old_advance = 0; 508 509 510 /* digit `0' is 0x30 in all supported charmaps */ 511 for ( i = 0x30; i <= 0x39; i++ ) 512 { 513 FT_ULong glyph_index; 514 FT_Long y_offset; 515 516 517 af_get_char_index( &metrics->root, i, &glyph_index, &y_offset ); 518 if ( glyph_index == 0 ) 519 continue; 520 521 if ( FT_Get_Advance( face, glyph_index, 522 FT_LOAD_NO_SCALE | 523 FT_LOAD_NO_HINTING | 524 FT_LOAD_IGNORE_TRANSFORM, 525 &advance ) ) 526 continue; 527 528 if ( started ) 529 { 530 if ( advance != old_advance ) 531 { 532 same_width = 0; 533 break; 534 } 535 } 536 else 537 { 538 old_advance = advance; 539 started = 1; 540 } 541 } 542 543 metrics->root.digits_have_same_width = same_width; 544 } 545 546 547 /* Initialize global metrics. */ 548 549 FT_LOCAL_DEF( FT_Error ) af_cjk_metrics_init(AF_CJKMetrics metrics,FT_Face face)550 af_cjk_metrics_init( AF_CJKMetrics metrics, 551 FT_Face face ) 552 { 553 FT_CharMap oldmap = face->charmap; 554 555 556 metrics->units_per_em = face->units_per_EM; 557 558 if ( !FT_Select_Charmap( face, FT_ENCODING_UNICODE ) ) 559 { 560 af_cjk_metrics_init_widths( metrics, face ); 561 af_cjk_metrics_init_blues( metrics, face ); 562 af_cjk_metrics_check_digits( metrics, face ); 563 } 564 565 FT_Set_Charmap( face, oldmap ); 566 return FT_Err_Ok; 567 } 568 569 570 /* Adjust scaling value, then scale and shift widths */ 571 /* and blue zones (if applicable) for given dimension. */ 572 573 static void af_cjk_metrics_scale_dim(AF_CJKMetrics metrics,AF_Scaler scaler,AF_Dimension dim)574 af_cjk_metrics_scale_dim( AF_CJKMetrics metrics, 575 AF_Scaler scaler, 576 AF_Dimension dim ) 577 { 578 FT_Fixed scale; 579 FT_Pos delta; 580 AF_CJKAxis axis; 581 FT_UInt nn; 582 583 584 if ( dim == AF_DIMENSION_HORZ ) 585 { 586 scale = scaler->x_scale; 587 delta = scaler->x_delta; 588 } 589 else 590 { 591 scale = scaler->y_scale; 592 delta = scaler->y_delta; 593 } 594 595 axis = &metrics->axis[dim]; 596 597 if ( axis->org_scale == scale && axis->org_delta == delta ) 598 return; 599 600 axis->org_scale = scale; 601 axis->org_delta = delta; 602 603 axis->scale = scale; 604 axis->delta = delta; 605 606 /* scale the blue zones */ 607 for ( nn = 0; nn < axis->blue_count; nn++ ) 608 { 609 AF_CJKBlue blue = &axis->blues[nn]; 610 FT_Pos dist; 611 612 613 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 614 blue->ref.fit = blue->ref.cur; 615 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 616 blue->shoot.fit = blue->shoot.cur; 617 blue->flags &= ~AF_CJK_BLUE_ACTIVE; 618 619 /* a blue zone is only active if it is less than 3/4 pixels tall */ 620 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 621 if ( dist <= 48 && dist >= -48 ) 622 { 623 FT_Pos delta1, delta2; 624 625 626 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 627 628 /* shoot is under shoot for cjk */ 629 delta1 = FT_DivFix( blue->ref.fit, scale ) - blue->shoot.org; 630 delta2 = delta1; 631 if ( delta1 < 0 ) 632 delta2 = -delta2; 633 634 delta2 = FT_MulFix( delta2, scale ); 635 636 FT_TRACE5(( "delta: %d", delta1 )); 637 if ( delta2 < 32 ) 638 delta2 = 0; 639 #if 0 640 else if ( delta2 < 64 ) 641 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 642 #endif 643 else 644 delta2 = FT_PIX_ROUND( delta2 ); 645 FT_TRACE5(( "/%d\n", delta2 )); 646 647 if ( delta1 < 0 ) 648 delta2 = -delta2; 649 650 blue->shoot.fit = blue->ref.fit - delta2; 651 652 FT_TRACE5(( ">> active cjk blue zone %c%d[%ld/%ld]:\n" 653 " ref: cur=%.2f fit=%.2f\n" 654 " shoot: cur=%.2f fit=%.2f\n", 655 ( dim == AF_DIMENSION_HORZ ) ? 'H' : 'V', 656 nn, blue->ref.org, blue->shoot.org, 657 blue->ref.cur / 64.0, blue->ref.fit / 64.0, 658 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 )); 659 660 blue->flags |= AF_CJK_BLUE_ACTIVE; 661 } 662 } 663 } 664 665 666 /* Scale global values in both directions. */ 667 668 FT_LOCAL_DEF( void ) af_cjk_metrics_scale(AF_CJKMetrics metrics,AF_Scaler scaler)669 af_cjk_metrics_scale( AF_CJKMetrics metrics, 670 AF_Scaler scaler ) 671 { 672 /* we copy the whole structure since the x and y scaling values */ 673 /* are not modified, contrary to e.g. the `latin' auto-hinter */ 674 metrics->root.scaler = *scaler; 675 676 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 677 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 678 } 679 680 681 /*************************************************************************/ 682 /*************************************************************************/ 683 /***** *****/ 684 /***** C J K G L Y P H A N A L Y S I S *****/ 685 /***** *****/ 686 /*************************************************************************/ 687 /*************************************************************************/ 688 689 690 /* Walk over all contours and compute its segments. */ 691 692 static FT_Error af_cjk_hints_compute_segments(AF_GlyphHints hints,AF_Dimension dim)693 af_cjk_hints_compute_segments( AF_GlyphHints hints, 694 AF_Dimension dim ) 695 { 696 AF_AxisHints axis = &hints->axis[dim]; 697 AF_Segment segments = axis->segments; 698 AF_Segment segment_limit = segments + axis->num_segments; 699 FT_Error error; 700 AF_Segment seg; 701 702 703 error = af_latin_hints_compute_segments( hints, dim ); 704 if ( error ) 705 return error; 706 707 /* a segment is round if it doesn't have successive */ 708 /* on-curve points. */ 709 for ( seg = segments; seg < segment_limit; seg++ ) 710 { 711 AF_Point pt = seg->first; 712 AF_Point last = seg->last; 713 AF_Flags f0 = (AF_Flags)( pt->flags & AF_FLAG_CONTROL ); 714 AF_Flags f1; 715 716 717 seg->flags &= ~AF_EDGE_ROUND; 718 719 for ( ; pt != last; f0 = f1 ) 720 { 721 pt = pt->next; 722 f1 = (AF_Flags)( pt->flags & AF_FLAG_CONTROL ); 723 724 if ( !f0 && !f1 ) 725 break; 726 727 if ( pt == last ) 728 seg->flags |= AF_EDGE_ROUND; 729 } 730 } 731 732 return FT_Err_Ok; 733 } 734 735 736 static void af_cjk_hints_link_segments(AF_GlyphHints hints,AF_Dimension dim)737 af_cjk_hints_link_segments( AF_GlyphHints hints, 738 AF_Dimension dim ) 739 { 740 AF_AxisHints axis = &hints->axis[dim]; 741 AF_Segment segments = axis->segments; 742 AF_Segment segment_limit = segments + axis->num_segments; 743 AF_Direction major_dir = axis->major_dir; 744 AF_Segment seg1, seg2; 745 FT_Pos len_threshold; 746 FT_Pos dist_threshold; 747 748 749 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 750 751 dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 752 : hints->y_scale; 753 dist_threshold = FT_DivFix( 64 * 3, dist_threshold ); 754 755 /* now compare each segment to the others */ 756 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 757 { 758 /* the fake segments are for metrics hinting only */ 759 if ( seg1->first == seg1->last ) 760 continue; 761 762 if ( seg1->dir != major_dir ) 763 continue; 764 765 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 766 if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 ) 767 { 768 FT_Pos dist = seg2->pos - seg1->pos; 769 770 771 if ( dist < 0 ) 772 continue; 773 774 { 775 FT_Pos min = seg1->min_coord; 776 FT_Pos max = seg1->max_coord; 777 FT_Pos len; 778 779 780 if ( min < seg2->min_coord ) 781 min = seg2->min_coord; 782 783 if ( max > seg2->max_coord ) 784 max = seg2->max_coord; 785 786 len = max - min; 787 if ( len >= len_threshold ) 788 { 789 if ( dist * 8 < seg1->score * 9 && 790 ( dist * 8 < seg1->score * 7 || seg1->len < len ) ) 791 { 792 seg1->score = dist; 793 seg1->len = len; 794 seg1->link = seg2; 795 } 796 797 if ( dist * 8 < seg2->score * 9 && 798 ( dist * 8 < seg2->score * 7 || seg2->len < len ) ) 799 { 800 seg2->score = dist; 801 seg2->len = len; 802 seg2->link = seg1; 803 } 804 } 805 } 806 } 807 } 808 809 /* 810 * now compute the `serif' segments 811 * 812 * In Hanzi, some strokes are wider on one or both of the ends. 813 * We either identify the stems on the ends as serifs or remove 814 * the linkage, depending on the length of the stems. 815 * 816 */ 817 818 { 819 AF_Segment link1, link2; 820 821 822 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 823 { 824 link1 = seg1->link; 825 if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos ) 826 continue; 827 828 if ( seg1->score >= dist_threshold ) 829 continue; 830 831 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 832 { 833 if ( seg2->pos > seg1->pos || seg1 == seg2 ) 834 continue; 835 836 link2 = seg2->link; 837 if ( !link2 || link2->link != seg2 || link2->pos < link1->pos ) 838 continue; 839 840 if ( seg1->pos == seg2->pos && link1->pos == link2->pos ) 841 continue; 842 843 if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score ) 844 continue; 845 846 /* seg2 < seg1 < link1 < link2 */ 847 848 if ( seg1->len >= seg2->len * 3 ) 849 { 850 AF_Segment seg; 851 852 853 for ( seg = segments; seg < segment_limit; seg++ ) 854 { 855 AF_Segment link = seg->link; 856 857 858 if ( link == seg2 ) 859 { 860 seg->link = 0; 861 seg->serif = link1; 862 } 863 else if ( link == link2 ) 864 { 865 seg->link = 0; 866 seg->serif = seg1; 867 } 868 } 869 } 870 else 871 { 872 seg1->link = link1->link = 0; 873 874 break; 875 } 876 } 877 } 878 } 879 880 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 881 { 882 seg2 = seg1->link; 883 884 if ( seg2 ) 885 { 886 seg2->num_linked++; 887 if ( seg2->link != seg1 ) 888 { 889 seg1->link = 0; 890 891 if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 ) 892 seg1->serif = seg2->link; 893 else 894 seg2->num_linked--; 895 } 896 } 897 } 898 } 899 900 901 static FT_Error af_cjk_hints_compute_edges(AF_GlyphHints hints,AF_Dimension dim)902 af_cjk_hints_compute_edges( AF_GlyphHints hints, 903 AF_Dimension dim ) 904 { 905 AF_AxisHints axis = &hints->axis[dim]; 906 FT_Error error = FT_Err_Ok; 907 FT_Memory memory = hints->memory; 908 AF_CJKAxis laxis = &((AF_CJKMetrics)hints->metrics)->axis[dim]; 909 910 AF_Segment segments = axis->segments; 911 AF_Segment segment_limit = segments + axis->num_segments; 912 AF_Segment seg; 913 914 FT_Fixed scale; 915 FT_Pos edge_distance_threshold; 916 917 918 axis->num_edges = 0; 919 920 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 921 : hints->y_scale; 922 923 /*********************************************************************/ 924 /* */ 925 /* We begin by generating a sorted table of edges for the current */ 926 /* direction. To do so, we simply scan each segment and try to find */ 927 /* an edge in our table that corresponds to its position. */ 928 /* */ 929 /* If no edge is found, we create and insert a new edge in the */ 930 /* sorted table. Otherwise, we simply add the segment to the edge's */ 931 /* list which is then processed in the second step to compute the */ 932 /* edge's properties. */ 933 /* */ 934 /* Note that the edges table is sorted along the segment/edge */ 935 /* position. */ 936 /* */ 937 /*********************************************************************/ 938 939 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 940 scale ); 941 if ( edge_distance_threshold > 64 / 4 ) 942 edge_distance_threshold = FT_DivFix( 64 / 4, scale ); 943 else 944 edge_distance_threshold = laxis->edge_distance_threshold; 945 946 for ( seg = segments; seg < segment_limit; seg++ ) 947 { 948 AF_Edge found = NULL; 949 FT_Pos best = 0xFFFFU; 950 FT_Int ee; 951 952 953 /* look for an edge corresponding to the segment */ 954 for ( ee = 0; ee < axis->num_edges; ee++ ) 955 { 956 AF_Edge edge = axis->edges + ee; 957 FT_Pos dist; 958 959 960 if ( edge->dir != seg->dir ) 961 continue; 962 963 dist = seg->pos - edge->fpos; 964 if ( dist < 0 ) 965 dist = -dist; 966 967 if ( dist < edge_distance_threshold && dist < best ) 968 { 969 AF_Segment link = seg->link; 970 971 972 /* check whether all linked segments of the candidate edge */ 973 /* can make a single edge. */ 974 if ( link ) 975 { 976 AF_Segment seg1 = edge->first; 977 FT_Pos dist2 = 0; 978 979 980 do 981 { 982 AF_Segment link1 = seg1->link; 983 984 985 if ( link1 ) 986 { 987 dist2 = AF_SEGMENT_DIST( link, link1 ); 988 if ( dist2 >= edge_distance_threshold ) 989 break; 990 } 991 992 } while ( ( seg1 = seg1->edge_next ) != edge->first ); 993 994 if ( dist2 >= edge_distance_threshold ) 995 continue; 996 } 997 998 best = dist; 999 found = edge; 1000 } 1001 } 1002 1003 if ( !found ) 1004 { 1005 AF_Edge edge; 1006 1007 1008 /* insert a new edge in the list and */ 1009 /* sort according to the position */ 1010 error = af_axis_hints_new_edge( axis, seg->pos, 1011 (AF_Direction)seg->dir, 1012 memory, &edge ); 1013 if ( error ) 1014 goto Exit; 1015 1016 /* add the segment to the new edge's list */ 1017 FT_ZERO( edge ); 1018 1019 edge->first = seg; 1020 edge->last = seg; 1021 edge->fpos = seg->pos; 1022 edge->opos = edge->pos = FT_MulFix( seg->pos, scale ); 1023 seg->edge_next = seg; 1024 edge->dir = seg->dir; 1025 } 1026 else 1027 { 1028 /* if an edge was found, simply add the segment to the edge's */ 1029 /* list */ 1030 seg->edge_next = found->first; 1031 found->last->edge_next = seg; 1032 found->last = seg; 1033 } 1034 } 1035 1036 /******************************************************************/ 1037 /* */ 1038 /* Good, we now compute each edge's properties according to the */ 1039 /* segments found on its position. Basically, these are */ 1040 /* */ 1041 /* - the edge's main direction */ 1042 /* - stem edge, serif edge or both (which defaults to stem then) */ 1043 /* - rounded edge, straight or both (which defaults to straight) */ 1044 /* - link for edge */ 1045 /* */ 1046 /******************************************************************/ 1047 1048 /* first of all, set the `edge' field in each segment -- this is */ 1049 /* required in order to compute edge links */ 1050 1051 /* 1052 * Note that removing this loop and setting the `edge' field of each 1053 * segment directly in the code above slows down execution speed for 1054 * some reasons on platforms like the Sun. 1055 */ 1056 { 1057 AF_Edge edges = axis->edges; 1058 AF_Edge edge_limit = edges + axis->num_edges; 1059 AF_Edge edge; 1060 1061 1062 for ( edge = edges; edge < edge_limit; edge++ ) 1063 { 1064 seg = edge->first; 1065 if ( seg ) 1066 do 1067 { 1068 seg->edge = edge; 1069 seg = seg->edge_next; 1070 1071 } while ( seg != edge->first ); 1072 } 1073 1074 /* now compute each edge properties */ 1075 for ( edge = edges; edge < edge_limit; edge++ ) 1076 { 1077 FT_Int is_round = 0; /* does it contain round segments? */ 1078 FT_Int is_straight = 0; /* does it contain straight segments? */ 1079 1080 1081 seg = edge->first; 1082 1083 do 1084 { 1085 FT_Bool is_serif; 1086 1087 1088 /* check for roundness of segment */ 1089 if ( seg->flags & AF_EDGE_ROUND ) 1090 is_round++; 1091 else 1092 is_straight++; 1093 1094 /* check for links -- if seg->serif is set, then seg->link must */ 1095 /* be ignored */ 1096 is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge ); 1097 1098 if ( seg->link || is_serif ) 1099 { 1100 AF_Edge edge2; 1101 AF_Segment seg2; 1102 1103 1104 edge2 = edge->link; 1105 seg2 = seg->link; 1106 1107 if ( is_serif ) 1108 { 1109 seg2 = seg->serif; 1110 edge2 = edge->serif; 1111 } 1112 1113 if ( edge2 ) 1114 { 1115 FT_Pos edge_delta; 1116 FT_Pos seg_delta; 1117 1118 1119 edge_delta = edge->fpos - edge2->fpos; 1120 if ( edge_delta < 0 ) 1121 edge_delta = -edge_delta; 1122 1123 seg_delta = AF_SEGMENT_DIST( seg, seg2 ); 1124 1125 if ( seg_delta < edge_delta ) 1126 edge2 = seg2->edge; 1127 } 1128 else 1129 edge2 = seg2->edge; 1130 1131 if ( is_serif ) 1132 { 1133 edge->serif = edge2; 1134 edge2->flags |= AF_EDGE_SERIF; 1135 } 1136 else 1137 edge->link = edge2; 1138 } 1139 1140 seg = seg->edge_next; 1141 1142 } while ( seg != edge->first ); 1143 1144 /* set the round/straight flags */ 1145 edge->flags = AF_EDGE_NORMAL; 1146 1147 if ( is_round > 0 && is_round >= is_straight ) 1148 edge->flags |= AF_EDGE_ROUND; 1149 1150 /* get rid of serifs if link is set */ 1151 /* XXX: This gets rid of many unpleasant artefacts! */ 1152 /* Example: the `c' in cour.pfa at size 13 */ 1153 1154 if ( edge->serif && edge->link ) 1155 edge->serif = 0; 1156 } 1157 } 1158 1159 Exit: 1160 return error; 1161 } 1162 1163 1164 /* Detect segments and edges for given dimension. */ 1165 1166 static FT_Error af_cjk_hints_detect_features(AF_GlyphHints hints,AF_Dimension dim)1167 af_cjk_hints_detect_features( AF_GlyphHints hints, 1168 AF_Dimension dim ) 1169 { 1170 FT_Error error; 1171 1172 1173 error = af_cjk_hints_compute_segments( hints, dim ); 1174 if ( !error ) 1175 { 1176 af_cjk_hints_link_segments( hints, dim ); 1177 1178 error = af_cjk_hints_compute_edges( hints, dim ); 1179 } 1180 return error; 1181 } 1182 1183 1184 /* Compute all edges which lie within blue zones. */ 1185 1186 FT_LOCAL_DEF( void ) af_cjk_hints_compute_blue_edges(AF_GlyphHints hints,AF_CJKMetrics metrics,AF_Dimension dim)1187 af_cjk_hints_compute_blue_edges( AF_GlyphHints hints, 1188 AF_CJKMetrics metrics, 1189 AF_Dimension dim ) 1190 { 1191 AF_AxisHints axis = &hints->axis[dim]; 1192 AF_Edge edge = axis->edges; 1193 AF_Edge edge_limit = edge + axis->num_edges; 1194 AF_CJKAxis cjk = &metrics->axis[dim]; 1195 FT_Fixed scale = cjk->scale; 1196 FT_Pos best_dist0; /* initial threshold */ 1197 1198 1199 /* compute the initial threshold as a fraction of the EM size */ 1200 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1201 1202 if ( best_dist0 > 64 / 2 ) /* maximum 1/2 pixel */ 1203 best_dist0 = 64 / 2; 1204 1205 /* compute which blue zones are active, i.e. have their scaled */ 1206 /* size < 3/4 pixels */ 1207 1208 /* If the distant between an edge and a blue zone is shorter than */ 1209 /* best_dist0, set the blue zone for the edge. Then search for */ 1210 /* the blue zone with the smallest best_dist to the edge. */ 1211 1212 for ( ; edge < edge_limit; edge++ ) 1213 { 1214 FT_UInt bb; 1215 AF_Width best_blue = NULL; 1216 FT_Pos best_dist = best_dist0; 1217 1218 1219 for ( bb = 0; bb < cjk->blue_count; bb++ ) 1220 { 1221 AF_CJKBlue blue = cjk->blues + bb; 1222 FT_Bool is_top_right_blue, is_major_dir; 1223 1224 1225 /* skip inactive blue zones (i.e., those that are too small) */ 1226 if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) ) 1227 continue; 1228 1229 /* if it is a top zone, check for right edges -- if it is a bottom */ 1230 /* zone, check for left edges */ 1231 /* */ 1232 /* of course, that's for TrueType */ 1233 is_top_right_blue = FT_BOOL( blue->flags & AF_CJK_BLUE_TOP ); 1234 is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); 1235 1236 /* if it is a top zone, the edge must be against the major */ 1237 /* direction; if it is a bottom zone, it must be in the major */ 1238 /* direction */ 1239 if ( is_top_right_blue ^ is_major_dir ) 1240 { 1241 FT_Pos dist; 1242 AF_Width compare; 1243 1244 1245 /* Compare the edge to the closest blue zone type */ 1246 if ( FT_ABS( edge->fpos - blue->ref.org ) > 1247 FT_ABS( edge->fpos - blue->shoot.org ) ) 1248 compare = &blue->shoot; 1249 else 1250 compare = &blue->ref; 1251 1252 dist = edge->fpos - compare->org; 1253 if ( dist < 0 ) 1254 dist = -dist; 1255 1256 dist = FT_MulFix( dist, scale ); 1257 if ( dist < best_dist ) 1258 { 1259 best_dist = dist; 1260 best_blue = compare; 1261 } 1262 } 1263 } 1264 1265 if ( best_blue ) 1266 edge->blue_edge = best_blue; 1267 } 1268 } 1269 1270 1271 /* Initalize hinting engine. */ 1272 1273 FT_LOCAL_DEF( FT_Error ) af_cjk_hints_init(AF_GlyphHints hints,AF_CJKMetrics metrics)1274 af_cjk_hints_init( AF_GlyphHints hints, 1275 AF_CJKMetrics metrics ) 1276 { 1277 FT_Render_Mode mode; 1278 FT_UInt32 scaler_flags, other_flags; 1279 1280 1281 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics ); 1282 1283 /* 1284 * correct x_scale and y_scale when needed, since they may have 1285 * been modified af_cjk_scale_dim above 1286 */ 1287 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1288 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1289 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1290 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1291 1292 /* compute flags depending on render mode, etc. */ 1293 mode = metrics->root.scaler.render_mode; 1294 1295 #ifdef AF_CONFIG_OPTION_USE_WARPER 1296 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1297 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1298 #endif 1299 1300 scaler_flags = hints->scaler_flags; 1301 other_flags = 0; 1302 1303 /* 1304 * We snap the width of vertical stems for the monochrome and 1305 * horizontal LCD rendering targets only. 1306 */ 1307 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1308 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1309 1310 /* 1311 * We snap the width of horizontal stems for the monochrome and 1312 * vertical LCD rendering targets only. 1313 */ 1314 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1315 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1316 1317 /* 1318 * We adjust stems to full pixels only if we don't use the `light' mode. 1319 */ 1320 if ( mode != FT_RENDER_MODE_LIGHT ) 1321 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1322 1323 if ( mode == FT_RENDER_MODE_MONO ) 1324 other_flags |= AF_LATIN_HINTS_MONO; 1325 1326 scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE; 1327 1328 hints->scaler_flags = scaler_flags; 1329 hints->other_flags = other_flags; 1330 1331 return FT_Err_Ok; 1332 } 1333 1334 1335 /*************************************************************************/ 1336 /*************************************************************************/ 1337 /***** *****/ 1338 /***** C J K G L Y P H G R I D - F I T T I N G *****/ 1339 /***** *****/ 1340 /*************************************************************************/ 1341 /*************************************************************************/ 1342 1343 /* Snap a given width in scaled coordinates to one of the */ 1344 /* current standard widths. */ 1345 1346 static FT_Pos af_cjk_snap_width(AF_Width widths,FT_Int count,FT_Pos width)1347 af_cjk_snap_width( AF_Width widths, 1348 FT_Int count, 1349 FT_Pos width ) 1350 { 1351 int n; 1352 FT_Pos best = 64 + 32 + 2; 1353 FT_Pos reference = width; 1354 FT_Pos scaled; 1355 1356 1357 for ( n = 0; n < count; n++ ) 1358 { 1359 FT_Pos w; 1360 FT_Pos dist; 1361 1362 1363 w = widths[n].cur; 1364 dist = width - w; 1365 if ( dist < 0 ) 1366 dist = -dist; 1367 if ( dist < best ) 1368 { 1369 best = dist; 1370 reference = w; 1371 } 1372 } 1373 1374 scaled = FT_PIX_ROUND( reference ); 1375 1376 if ( width >= reference ) 1377 { 1378 if ( width < scaled + 48 ) 1379 width = reference; 1380 } 1381 else 1382 { 1383 if ( width > scaled - 48 ) 1384 width = reference; 1385 } 1386 1387 return width; 1388 } 1389 1390 1391 /* Compute the snapped width of a given stem. */ 1392 /* There is a lot of voodoo in this function; changing the hard-coded */ 1393 /* parameters influence the whole hinting process. */ 1394 1395 static FT_Pos af_cjk_compute_stem_width(AF_GlyphHints hints,AF_Dimension dim,FT_Pos width,AF_Edge_Flags base_flags,AF_Edge_Flags stem_flags)1396 af_cjk_compute_stem_width( AF_GlyphHints hints, 1397 AF_Dimension dim, 1398 FT_Pos width, 1399 AF_Edge_Flags base_flags, 1400 AF_Edge_Flags stem_flags ) 1401 { 1402 AF_CJKMetrics metrics = (AF_CJKMetrics)hints->metrics; 1403 AF_CJKAxis axis = &metrics->axis[dim]; 1404 FT_Pos dist = width; 1405 FT_Int sign = 0; 1406 FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT ); 1407 1408 FT_UNUSED( base_flags ); 1409 FT_UNUSED( stem_flags ); 1410 1411 1412 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1413 return width; 1414 1415 if ( dist < 0 ) 1416 { 1417 dist = -width; 1418 sign = 1; 1419 } 1420 1421 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1422 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1423 { 1424 /* smooth hinting process: very lightly quantize the stem width */ 1425 1426 if ( axis->width_count > 0 ) 1427 { 1428 if ( FT_ABS( dist - axis->widths[0].cur ) < 40 ) 1429 { 1430 dist = axis->widths[0].cur; 1431 if ( dist < 48 ) 1432 dist = 48; 1433 1434 goto Done_Width; 1435 } 1436 } 1437 1438 if ( dist < 54 ) 1439 dist += ( 54 - dist ) / 2 ; 1440 else if ( dist < 3 * 64 ) 1441 { 1442 FT_Pos delta; 1443 1444 1445 delta = dist & 63; 1446 dist &= -64; 1447 1448 if ( delta < 10 ) 1449 dist += delta; 1450 else if ( delta < 22 ) 1451 dist += 10; 1452 else if ( delta < 42 ) 1453 dist += delta; 1454 else if ( delta < 54 ) 1455 dist += 54; 1456 else 1457 dist += delta; 1458 } 1459 } 1460 else 1461 { 1462 /* strong hinting process: snap the stem width to integer pixels */ 1463 1464 dist = af_cjk_snap_width( axis->widths, axis->width_count, dist ); 1465 1466 if ( vertical ) 1467 { 1468 /* in the case of vertical hinting, always round */ 1469 /* the stem heights to integer pixels */ 1470 1471 if ( dist >= 64 ) 1472 dist = ( dist + 16 ) & ~63; 1473 else 1474 dist = 64; 1475 } 1476 else 1477 { 1478 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1479 { 1480 /* monochrome horizontal hinting: snap widths to integer pixels */ 1481 /* with a different threshold */ 1482 1483 if ( dist < 64 ) 1484 dist = 64; 1485 else 1486 dist = ( dist + 32 ) & ~63; 1487 } 1488 else 1489 { 1490 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1491 /* approach: we strengthen small stems, round stems whose size */ 1492 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1493 1494 if ( dist < 48 ) 1495 dist = ( dist + 64 ) >> 1; 1496 1497 else if ( dist < 128 ) 1498 dist = ( dist + 22 ) & ~63; 1499 else 1500 /* round otherwise to prevent color fringes in LCD mode */ 1501 dist = ( dist + 32 ) & ~63; 1502 } 1503 } 1504 } 1505 1506 Done_Width: 1507 if ( sign ) 1508 dist = -dist; 1509 1510 return dist; 1511 } 1512 1513 1514 /* Align one stem edge relative to the previous stem edge. */ 1515 1516 static void af_cjk_align_linked_edge(AF_GlyphHints hints,AF_Dimension dim,AF_Edge base_edge,AF_Edge stem_edge)1517 af_cjk_align_linked_edge( AF_GlyphHints hints, 1518 AF_Dimension dim, 1519 AF_Edge base_edge, 1520 AF_Edge stem_edge ) 1521 { 1522 FT_Pos dist = stem_edge->opos - base_edge->opos; 1523 1524 FT_Pos fitted_width = af_cjk_compute_stem_width( 1525 hints, dim, dist, 1526 (AF_Edge_Flags)base_edge->flags, 1527 (AF_Edge_Flags)stem_edge->flags ); 1528 1529 1530 stem_edge->pos = base_edge->pos + fitted_width; 1531 } 1532 1533 1534 /* Shift the coordinates of the `serif' edge by the same amount */ 1535 /* as the corresponding `base' edge has been moved already. */ 1536 1537 static void af_cjk_align_serif_edge(AF_GlyphHints hints,AF_Edge base,AF_Edge serif)1538 af_cjk_align_serif_edge( AF_GlyphHints hints, 1539 AF_Edge base, 1540 AF_Edge serif ) 1541 { 1542 FT_UNUSED( hints ); 1543 1544 serif->pos = base->pos + ( serif->opos - base->opos ); 1545 } 1546 1547 1548 /*************************************************************************/ 1549 /*************************************************************************/ 1550 /*************************************************************************/ 1551 /**** ****/ 1552 /**** E D G E H I N T I N G ****/ 1553 /**** ****/ 1554 /*************************************************************************/ 1555 /*************************************************************************/ 1556 /*************************************************************************/ 1557 1558 1559 #define AF_LIGHT_MODE_MAX_HORZ_GAP 9 1560 #define AF_LIGHT_MODE_MAX_VERT_GAP 15 1561 #define AF_LIGHT_MODE_MAX_DELTA_ABS 14 1562 1563 1564 static FT_Pos af_hint_normal_stem(AF_GlyphHints hints,AF_Edge edge,AF_Edge edge2,FT_Pos anchor,AF_Dimension dim)1565 af_hint_normal_stem( AF_GlyphHints hints, 1566 AF_Edge edge, 1567 AF_Edge edge2, 1568 FT_Pos anchor, 1569 AF_Dimension dim ) 1570 { 1571 FT_Pos org_len, cur_len, org_center; 1572 FT_Pos cur_pos1, cur_pos2; 1573 FT_Pos d_off1, u_off1, d_off2, u_off2, delta; 1574 FT_Pos offset; 1575 FT_Pos threshold = 64; 1576 1577 1578 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1579 { 1580 if ( ( edge->flags & AF_EDGE_ROUND ) && 1581 ( edge2->flags & AF_EDGE_ROUND ) ) 1582 { 1583 if ( dim == AF_DIMENSION_VERT ) 1584 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP; 1585 else 1586 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP; 1587 } 1588 else 1589 { 1590 if ( dim == AF_DIMENSION_VERT ) 1591 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3; 1592 else 1593 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3; 1594 } 1595 } 1596 1597 org_len = edge2->opos - edge->opos; 1598 cur_len = af_cjk_compute_stem_width( hints, dim, org_len, 1599 (AF_Edge_Flags)edge->flags, 1600 (AF_Edge_Flags)edge2->flags ); 1601 1602 org_center = ( edge->opos + edge2->opos ) / 2 + anchor; 1603 cur_pos1 = org_center - cur_len / 2; 1604 cur_pos2 = cur_pos1 + cur_len; 1605 d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 ); 1606 d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 ); 1607 u_off1 = 64 - d_off1; 1608 u_off2 = 64 - d_off2; 1609 delta = 0; 1610 1611 1612 if ( d_off1 == 0 || d_off2 == 0 ) 1613 goto Exit; 1614 1615 if ( cur_len <= threshold ) 1616 { 1617 if ( d_off2 < cur_len ) 1618 { 1619 if ( u_off1 <= d_off2 ) 1620 delta = u_off1; 1621 else 1622 delta = -d_off2; 1623 } 1624 1625 goto Exit; 1626 } 1627 1628 if ( threshold < 64 ) 1629 { 1630 if ( d_off1 >= threshold || u_off1 >= threshold || 1631 d_off2 >= threshold || u_off2 >= threshold ) 1632 goto Exit; 1633 } 1634 1635 offset = cur_len & 63; 1636 1637 if ( offset < 32 ) 1638 { 1639 if ( u_off1 <= offset || d_off2 <= offset ) 1640 goto Exit; 1641 } 1642 else 1643 offset = 64 - threshold; 1644 1645 d_off1 = threshold - u_off1; 1646 u_off1 = u_off1 - offset; 1647 u_off2 = threshold - d_off2; 1648 d_off2 = d_off2 - offset; 1649 1650 if ( d_off1 <= u_off1 ) 1651 u_off1 = -d_off1; 1652 1653 if ( d_off2 <= u_off2 ) 1654 u_off2 = -d_off2; 1655 1656 if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) ) 1657 delta = u_off1; 1658 else 1659 delta = u_off2; 1660 1661 Exit: 1662 1663 #if 1 1664 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1665 { 1666 if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS ) 1667 delta = AF_LIGHT_MODE_MAX_DELTA_ABS; 1668 else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS ) 1669 delta = -AF_LIGHT_MODE_MAX_DELTA_ABS; 1670 } 1671 #endif 1672 1673 cur_pos1 += delta; 1674 1675 if ( edge->opos < edge2->opos ) 1676 { 1677 edge->pos = cur_pos1; 1678 edge2->pos = cur_pos1 + cur_len; 1679 } 1680 else 1681 { 1682 edge->pos = cur_pos1 + cur_len; 1683 edge2->pos = cur_pos1; 1684 } 1685 1686 return delta; 1687 } 1688 1689 1690 /* The main grid-fitting routine. */ 1691 1692 static void af_cjk_hint_edges(AF_GlyphHints hints,AF_Dimension dim)1693 af_cjk_hint_edges( AF_GlyphHints hints, 1694 AF_Dimension dim ) 1695 { 1696 AF_AxisHints axis = &hints->axis[dim]; 1697 AF_Edge edges = axis->edges; 1698 AF_Edge edge_limit = edges + axis->num_edges; 1699 FT_PtrDist n_edges; 1700 AF_Edge edge; 1701 AF_Edge anchor = 0; 1702 FT_Pos delta = 0; 1703 FT_Int skipped = 0; 1704 FT_Bool has_last_stem = FALSE; 1705 FT_Pos last_stem_pos = 0; 1706 1707 #ifdef FT_DEBUG_LEVEL_TRACE 1708 FT_UInt num_actions = 0; 1709 #endif 1710 1711 1712 FT_TRACE5(( "cjk %s edge hinting (style `%s')\n", 1713 dim == AF_DIMENSION_VERT ? "horizontal" : "vertical", 1714 af_style_names[hints->metrics->style_class->style] )); 1715 1716 /* we begin by aligning all stems relative to the blue zone */ 1717 1718 if ( AF_HINTS_DO_BLUES( hints ) ) 1719 { 1720 for ( edge = edges; edge < edge_limit; edge++ ) 1721 { 1722 AF_Width blue; 1723 AF_Edge edge1, edge2; 1724 1725 1726 if ( edge->flags & AF_EDGE_DONE ) 1727 continue; 1728 1729 blue = edge->blue_edge; 1730 edge1 = NULL; 1731 edge2 = edge->link; 1732 1733 if ( blue ) 1734 { 1735 edge1 = edge; 1736 } 1737 else if ( edge2 && edge2->blue_edge ) 1738 { 1739 blue = edge2->blue_edge; 1740 edge1 = edge2; 1741 edge2 = edge; 1742 } 1743 1744 if ( !edge1 ) 1745 continue; 1746 1747 #ifdef FT_DEBUG_LEVEL_TRACE 1748 FT_TRACE5(( " CJKBLUE: edge %d @%d (opos=%.2f) snapped to %.2f," 1749 " was %.2f\n", 1750 edge1 - edges, edge1->fpos, edge1->opos / 64.0, 1751 blue->fit / 64.0, edge1->pos / 64.0 )); 1752 1753 num_actions++; 1754 #endif 1755 1756 edge1->pos = blue->fit; 1757 edge1->flags |= AF_EDGE_DONE; 1758 1759 if ( edge2 && !edge2->blue_edge ) 1760 { 1761 af_cjk_align_linked_edge( hints, dim, edge1, edge2 ); 1762 edge2->flags |= AF_EDGE_DONE; 1763 1764 #ifdef FT_DEBUG_LEVEL_TRACE 1765 num_actions++; 1766 #endif 1767 } 1768 1769 if ( !anchor ) 1770 anchor = edge; 1771 } 1772 } 1773 1774 /* now we align all stem edges. */ 1775 for ( edge = edges; edge < edge_limit; edge++ ) 1776 { 1777 AF_Edge edge2; 1778 1779 1780 if ( edge->flags & AF_EDGE_DONE ) 1781 continue; 1782 1783 /* skip all non-stem edges */ 1784 edge2 = edge->link; 1785 if ( !edge2 ) 1786 { 1787 skipped++; 1788 continue; 1789 } 1790 1791 /* Some CJK characters have so many stems that 1792 * the hinter is likely to merge two adjacent ones. 1793 * To solve this problem, if either edge of a stem 1794 * is too close to the previous one, we avoid 1795 * aligning the two edges, but rather interpolate 1796 * their locations at the end of this function in 1797 * order to preserve the space between the stems. 1798 */ 1799 if ( has_last_stem && 1800 ( edge->pos < last_stem_pos + 64 || 1801 edge2->pos < last_stem_pos + 64 ) ) 1802 { 1803 skipped++; 1804 continue; 1805 } 1806 1807 /* now align the stem */ 1808 1809 /* this should not happen, but it's better to be safe */ 1810 if ( edge2->blue_edge ) 1811 { 1812 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1813 1814 af_cjk_align_linked_edge( hints, dim, edge2, edge ); 1815 edge->flags |= AF_EDGE_DONE; 1816 1817 #ifdef FT_DEBUG_LEVEL_TRACE 1818 num_actions++; 1819 #endif 1820 1821 continue; 1822 } 1823 1824 if ( edge2 < edge ) 1825 { 1826 af_cjk_align_linked_edge( hints, dim, edge2, edge ); 1827 edge->flags |= AF_EDGE_DONE; 1828 1829 #ifdef FT_DEBUG_LEVEL_TRACE 1830 num_actions++; 1831 #endif 1832 1833 /* We rarely reaches here it seems; 1834 * usually the two edges belonging 1835 * to one stem are marked as DONE together 1836 */ 1837 has_last_stem = TRUE; 1838 last_stem_pos = edge->pos; 1839 continue; 1840 } 1841 1842 if ( dim != AF_DIMENSION_VERT && !anchor ) 1843 { 1844 1845 #if 0 1846 if ( fixedpitch ) 1847 { 1848 AF_Edge left = edge; 1849 AF_Edge right = edge_limit - 1; 1850 AF_EdgeRec left1, left2, right1, right2; 1851 FT_Pos target, center1, center2; 1852 FT_Pos delta1, delta2, d1, d2; 1853 1854 1855 while ( right > left && !right->link ) 1856 right--; 1857 1858 left1 = *left; 1859 left2 = *left->link; 1860 right1 = *right->link; 1861 right2 = *right; 1862 1863 delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2; 1864 target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16; 1865 1866 delta1 = delta; 1867 delta1 += af_hint_normal_stem( hints, left, left->link, 1868 delta1, 0 ); 1869 1870 if ( left->link != right ) 1871 af_hint_normal_stem( hints, right->link, right, delta1, 0 ); 1872 1873 center1 = left->pos + ( right->pos - left->pos ) / 2; 1874 1875 if ( center1 >= target ) 1876 delta2 = delta - 32; 1877 else 1878 delta2 = delta + 32; 1879 1880 delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 ); 1881 1882 if ( delta1 != delta2 ) 1883 { 1884 if ( left->link != right ) 1885 af_hint_normal_stem( hints, &right1, &right2, delta2, 0 ); 1886 1887 center2 = left1.pos + ( right2.pos - left1.pos ) / 2; 1888 1889 d1 = center1 - target; 1890 d2 = center2 - target; 1891 1892 if ( FT_ABS( d2 ) < FT_ABS( d1 ) ) 1893 { 1894 left->pos = left1.pos; 1895 left->link->pos = left2.pos; 1896 1897 if ( left->link != right ) 1898 { 1899 right->link->pos = right1.pos; 1900 right->pos = right2.pos; 1901 } 1902 1903 delta1 = delta2; 1904 } 1905 } 1906 1907 delta = delta1; 1908 right->link->flags |= AF_EDGE_DONE; 1909 right->flags |= AF_EDGE_DONE; 1910 } 1911 else 1912 1913 #endif /* 0 */ 1914 1915 delta = af_hint_normal_stem( hints, edge, edge2, 0, 1916 AF_DIMENSION_HORZ ); 1917 } 1918 else 1919 af_hint_normal_stem( hints, edge, edge2, delta, dim ); 1920 1921 #if 0 1922 printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n", 1923 edge - edges, edge2 - edges, 1924 ( edge->pos - edge->opos ) / 64.0, 1925 ( edge2->pos - edge2->opos ) / 64.0 ); 1926 #endif 1927 1928 anchor = edge; 1929 edge->flags |= AF_EDGE_DONE; 1930 edge2->flags |= AF_EDGE_DONE; 1931 has_last_stem = TRUE; 1932 last_stem_pos = edge2->pos; 1933 } 1934 1935 /* make sure that lowercase m's maintain their symmetry */ 1936 1937 /* In general, lowercase m's have six vertical edges if they are sans */ 1938 /* serif, or twelve if they are with serifs. This implementation is */ 1939 /* based on that assumption, and seems to work very well with most */ 1940 /* faces. However, if for a certain face this assumption is not */ 1941 /* true, the m is just rendered like before. In addition, any stem */ 1942 /* correction will only be applied to symmetrical glyphs (even if the */ 1943 /* glyph is not an m), so the potential for unwanted distortion is */ 1944 /* relatively low. */ 1945 1946 /* We don't handle horizontal edges since we can't easily assure that */ 1947 /* the third (lowest) stem aligns with the base line; it might end up */ 1948 /* one pixel higher or lower. */ 1949 1950 n_edges = edge_limit - edges; 1951 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 1952 { 1953 AF_Edge edge1, edge2, edge3; 1954 FT_Pos dist1, dist2, span; 1955 1956 1957 if ( n_edges == 6 ) 1958 { 1959 edge1 = edges; 1960 edge2 = edges + 2; 1961 edge3 = edges + 4; 1962 } 1963 else 1964 { 1965 edge1 = edges + 1; 1966 edge2 = edges + 5; 1967 edge3 = edges + 9; 1968 } 1969 1970 dist1 = edge2->opos - edge1->opos; 1971 dist2 = edge3->opos - edge2->opos; 1972 1973 span = dist1 - dist2; 1974 if ( span < 0 ) 1975 span = -span; 1976 1977 if ( edge1->link == edge1 + 1 && 1978 edge2->link == edge2 + 1 && 1979 edge3->link == edge3 + 1 && span < 8 ) 1980 { 1981 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 1982 edge3->pos -= delta; 1983 if ( edge3->link ) 1984 edge3->link->pos -= delta; 1985 1986 /* move the serifs along with the stem */ 1987 if ( n_edges == 12 ) 1988 { 1989 ( edges + 8 )->pos -= delta; 1990 ( edges + 11 )->pos -= delta; 1991 } 1992 1993 edge3->flags |= AF_EDGE_DONE; 1994 if ( edge3->link ) 1995 edge3->link->flags |= AF_EDGE_DONE; 1996 } 1997 } 1998 1999 if ( !skipped ) 2000 goto Exit; 2001 2002 /* 2003 * now hint the remaining edges (serifs and single) in order 2004 * to complete our processing 2005 */ 2006 for ( edge = edges; edge < edge_limit; edge++ ) 2007 { 2008 if ( edge->flags & AF_EDGE_DONE ) 2009 continue; 2010 2011 if ( edge->serif ) 2012 { 2013 af_cjk_align_serif_edge( hints, edge->serif, edge ); 2014 edge->flags |= AF_EDGE_DONE; 2015 skipped--; 2016 } 2017 } 2018 2019 if ( !skipped ) 2020 goto Exit; 2021 2022 for ( edge = edges; edge < edge_limit; edge++ ) 2023 { 2024 AF_Edge before, after; 2025 2026 2027 if ( edge->flags & AF_EDGE_DONE ) 2028 continue; 2029 2030 before = after = edge; 2031 2032 while ( --before >= edges ) 2033 if ( before->flags & AF_EDGE_DONE ) 2034 break; 2035 2036 while ( ++after < edge_limit ) 2037 if ( after->flags & AF_EDGE_DONE ) 2038 break; 2039 2040 if ( before >= edges || after < edge_limit ) 2041 { 2042 if ( before < edges ) 2043 af_cjk_align_serif_edge( hints, after, edge ); 2044 else if ( after >= edge_limit ) 2045 af_cjk_align_serif_edge( hints, before, edge ); 2046 else 2047 { 2048 if ( after->fpos == before->fpos ) 2049 edge->pos = before->pos; 2050 else 2051 edge->pos = before->pos + 2052 FT_MulDiv( edge->fpos - before->fpos, 2053 after->pos - before->pos, 2054 after->fpos - before->fpos ); 2055 } 2056 } 2057 } 2058 2059 Exit: 2060 2061 #ifdef FT_DEBUG_LEVEL_TRACE 2062 if ( !num_actions ) 2063 FT_TRACE5(( " (none)\n" )); 2064 FT_TRACE5(( "\n" )); 2065 #endif 2066 2067 return; 2068 } 2069 2070 2071 static void af_cjk_align_edge_points(AF_GlyphHints hints,AF_Dimension dim)2072 af_cjk_align_edge_points( AF_GlyphHints hints, 2073 AF_Dimension dim ) 2074 { 2075 AF_AxisHints axis = & hints->axis[dim]; 2076 AF_Edge edges = axis->edges; 2077 AF_Edge edge_limit = edges + axis->num_edges; 2078 AF_Edge edge; 2079 FT_Bool snapping; 2080 2081 2082 snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ && 2083 AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) || 2084 ( dim == AF_DIMENSION_VERT && 2085 AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ); 2086 2087 for ( edge = edges; edge < edge_limit; edge++ ) 2088 { 2089 /* move the points of each segment */ 2090 /* in each edge to the edge's position */ 2091 AF_Segment seg = edge->first; 2092 2093 2094 if ( snapping ) 2095 { 2096 do 2097 { 2098 AF_Point point = seg->first; 2099 2100 2101 for (;;) 2102 { 2103 if ( dim == AF_DIMENSION_HORZ ) 2104 { 2105 point->x = edge->pos; 2106 point->flags |= AF_FLAG_TOUCH_X; 2107 } 2108 else 2109 { 2110 point->y = edge->pos; 2111 point->flags |= AF_FLAG_TOUCH_Y; 2112 } 2113 2114 if ( point == seg->last ) 2115 break; 2116 2117 point = point->next; 2118 } 2119 2120 seg = seg->edge_next; 2121 2122 } while ( seg != edge->first ); 2123 } 2124 else 2125 { 2126 FT_Pos delta = edge->pos - edge->opos; 2127 2128 2129 do 2130 { 2131 AF_Point point = seg->first; 2132 2133 2134 for (;;) 2135 { 2136 if ( dim == AF_DIMENSION_HORZ ) 2137 { 2138 point->x += delta; 2139 point->flags |= AF_FLAG_TOUCH_X; 2140 } 2141 else 2142 { 2143 point->y += delta; 2144 point->flags |= AF_FLAG_TOUCH_Y; 2145 } 2146 2147 if ( point == seg->last ) 2148 break; 2149 2150 point = point->next; 2151 } 2152 2153 seg = seg->edge_next; 2154 2155 } while ( seg != edge->first ); 2156 } 2157 } 2158 } 2159 2160 2161 /* Apply the complete hinting algorithm to a CJK glyph. */ 2162 2163 FT_LOCAL_DEF( FT_Error ) af_cjk_hints_apply(AF_GlyphHints hints,FT_Outline * outline,AF_CJKMetrics metrics)2164 af_cjk_hints_apply( AF_GlyphHints hints, 2165 FT_Outline* outline, 2166 AF_CJKMetrics metrics ) 2167 { 2168 FT_Error error; 2169 int dim; 2170 2171 FT_UNUSED( metrics ); 2172 2173 2174 error = af_glyph_hints_reload( hints, outline ); 2175 if ( error ) 2176 goto Exit; 2177 2178 /* analyze glyph outline */ 2179 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2180 { 2181 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2182 if ( error ) 2183 goto Exit; 2184 2185 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_HORZ ); 2186 } 2187 2188 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2189 { 2190 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT ); 2191 if ( error ) 2192 goto Exit; 2193 2194 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_VERT ); 2195 } 2196 2197 /* grid-fit the outline */ 2198 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2199 { 2200 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2201 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2202 { 2203 2204 #ifdef AF_CONFIG_OPTION_USE_WARPER 2205 if ( dim == AF_DIMENSION_HORZ && 2206 metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL ) 2207 { 2208 AF_WarperRec warper; 2209 FT_Fixed scale; 2210 FT_Pos delta; 2211 2212 2213 af_warper_compute( &warper, hints, (AF_Dimension)dim, 2214 &scale, &delta ); 2215 af_glyph_hints_scale_dim( hints, (AF_Dimension)dim, 2216 scale, delta ); 2217 continue; 2218 } 2219 #endif /* AF_CONFIG_OPTION_USE_WARPER */ 2220 2221 af_cjk_hint_edges( hints, (AF_Dimension)dim ); 2222 af_cjk_align_edge_points( hints, (AF_Dimension)dim ); 2223 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2224 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2225 } 2226 } 2227 2228 #if 0 2229 af_glyph_hints_dump_points( hints ); 2230 af_glyph_hints_dump_segments( hints ); 2231 af_glyph_hints_dump_edges( hints ); 2232 #endif 2233 2234 af_glyph_hints_save( hints, outline ); 2235 2236 Exit: 2237 return error; 2238 } 2239 2240 2241 /*************************************************************************/ 2242 /*************************************************************************/ 2243 /***** *****/ 2244 /***** C J K S C R I P T C L A S S *****/ 2245 /***** *****/ 2246 /*************************************************************************/ 2247 /*************************************************************************/ 2248 2249 2250 AF_DEFINE_WRITING_SYSTEM_CLASS( 2251 af_cjk_writing_system_class, 2252 2253 AF_WRITING_SYSTEM_CJK, 2254 2255 sizeof ( AF_CJKMetricsRec ), 2256 2257 (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init, 2258 (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale, 2259 (AF_WritingSystem_DoneMetricsFunc) NULL, 2260 2261 (AF_WritingSystem_InitHintsFunc) af_cjk_hints_init, 2262 (AF_WritingSystem_ApplyHintsFunc) af_cjk_hints_apply 2263 ) 2264 2265 2266 #else /* !AF_CONFIG_OPTION_CJK */ 2267 2268 2269 AF_DEFINE_WRITING_SYSTEM_CLASS( 2270 af_cjk_writing_system_class, 2271 2272 AF_WRITING_SYSTEM_CJK, 2273 2274 sizeof ( AF_CJKMetricsRec ), 2275 2276 (AF_WritingSystem_InitMetricsFunc) NULL, 2277 (AF_WritingSystem_ScaleMetricsFunc)NULL, 2278 (AF_WritingSystem_DoneMetricsFunc) NULL, 2279 2280 (AF_WritingSystem_InitHintsFunc) NULL, 2281 (AF_WritingSystem_ApplyHintsFunc) NULL 2282 ) 2283 2284 2285 #endif /* !AF_CONFIG_OPTION_CJK */ 2286 2287 2288 /* END */ 2289