afcjk.c (66588B)
1 /**************************************************************************** 2 * 3 * afcjk.c 4 * 5 * Auto-fitter hinting routines for CJK writing system (body). 6 * 7 * Copyright (C) 2006-2025 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, archived at 20 * 21 * https://web.archive.org/web/20051219160454/http://www.kde.gr.jp:80/~akito/patch/freetype2/2.1.7/ 22 * 23 */ 24 25 #include <freetype/ftadvanc.h> 26 #include <freetype/internal/ftdebug.h> 27 28 #include "afglobal.h" 29 #include "aflatin.h" 30 #include "afcjk.h" 31 32 33 #ifdef AF_CONFIG_OPTION_CJK 34 35 #undef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT 36 37 #include "aferrors.h" 38 39 40 /************************************************************************** 41 * 42 * The macro FT_COMPONENT is used in trace mode. It is an implicit 43 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log 44 * messages during execution. 45 */ 46 #undef FT_COMPONENT 47 #define FT_COMPONENT afcjk 48 49 50 /*************************************************************************/ 51 /*************************************************************************/ 52 /***** *****/ 53 /***** C J K G L O B A L M E T R I C S *****/ 54 /***** *****/ 55 /*************************************************************************/ 56 /*************************************************************************/ 57 58 59 /* Basically the Latin version with AF_CJKMetrics */ 60 /* to replace AF_LatinMetrics. */ 61 62 FT_LOCAL_DEF( void ) 63 af_cjk_metrics_init_widths( AF_CJKMetrics metrics, 64 FT_Face face ) 65 { 66 /* scan the array of segments in each direction */ 67 AF_GlyphHintsRec hints[1]; 68 69 70 FT_TRACE5(( "\n" )); 71 FT_TRACE5(( "cjk standard widths computation (style `%s')\n", 72 af_style_names[metrics->root.style_class->style] )); 73 FT_TRACE5(( "===================================================\n" )); 74 FT_TRACE5(( "\n" )); 75 76 af_glyph_hints_init( hints, face->memory ); 77 78 metrics->axis[AF_DIMENSION_HORZ].width_count = 0; 79 metrics->axis[AF_DIMENSION_VERT].width_count = 0; 80 81 { 82 FT_Error error; 83 FT_ULong glyph_index; 84 int dim; 85 AF_CJKMetricsRec dummy[1]; 86 AF_Scaler scaler = &dummy->root.scaler; 87 88 AF_StyleClass style_class = metrics->root.style_class; 89 AF_ScriptClass script_class = af_script_classes[style_class->script]; 90 91 /* If HarfBuzz is not available, we need a pointer to a single */ 92 /* unsigned long value. */ 93 FT_ULong shaper_buf_; 94 void* shaper_buf = &shaper_buf_; 95 96 const char* p; 97 98 #ifdef FT_DEBUG_LEVEL_TRACE 99 FT_ULong ch = 0; 100 #endif 101 102 p = script_class->standard_charstring; 103 104 if ( ft_hb_enabled( metrics->root.globals ) ) 105 shaper_buf = af_shaper_buf_create( metrics->root.globals ); 106 107 /* We check a list of standard characters. The first match wins. */ 108 109 glyph_index = 0; 110 while ( *p ) 111 { 112 unsigned int num_idx; 113 114 #ifdef FT_DEBUG_LEVEL_TRACE 115 const char* p_old; 116 #endif 117 118 119 while ( *p == ' ' ) 120 p++; 121 122 #ifdef FT_DEBUG_LEVEL_TRACE 123 p_old = p; 124 GET_UTF8_CHAR( ch, p_old ); 125 #endif 126 127 /* reject input that maps to more than a single glyph */ 128 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx ); 129 if ( num_idx > 1 ) 130 continue; 131 132 /* otherwise exit loop if we have a result */ 133 glyph_index = af_shaper_get_elem( &metrics->root, 134 shaper_buf, 135 0, 136 NULL, 137 NULL ); 138 if ( glyph_index ) 139 break; 140 } 141 142 af_shaper_buf_destroy( metrics->root.globals, shaper_buf ); 143 144 if ( !glyph_index ) 145 goto Exit; 146 147 if ( !glyph_index ) 148 goto Exit; 149 150 FT_TRACE5(( "standard character: U+%04lX (glyph index %lu)\n", 151 ch, glyph_index )); 152 153 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 154 if ( error || face->glyph->outline.n_points <= 0 ) 155 goto Exit; 156 157 FT_ZERO( dummy ); 158 159 dummy->units_per_em = metrics->units_per_em; 160 161 scaler->x_scale = 0x10000L; 162 scaler->y_scale = 0x10000L; 163 scaler->x_delta = 0; 164 scaler->y_delta = 0; 165 166 scaler->face = face; 167 scaler->render_mode = FT_RENDER_MODE_NORMAL; 168 scaler->flags = 0; 169 170 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy ); 171 172 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 173 if ( error ) 174 goto Exit; 175 176 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 177 { 178 AF_CJKAxis axis = &metrics->axis[dim]; 179 AF_AxisHints axhints = &hints->axis[dim]; 180 AF_Segment seg, limit, link; 181 FT_UInt num_widths = 0; 182 183 184 error = af_latin_hints_compute_segments( hints, 185 (AF_Dimension)dim ); 186 if ( error ) 187 goto Exit; 188 189 /* 190 * We assume that the glyphs selected for the stem width 191 * computation are `featureless' enough so that the linking 192 * algorithm works fine without adjustments of its scoring 193 * function. 194 */ 195 af_latin_hints_link_segments( hints, 196 0, 197 NULL, 198 (AF_Dimension)dim ); 199 200 seg = axhints->segments; 201 limit = seg + axhints->num_segments; 202 203 for ( ; seg < limit; seg++ ) 204 { 205 link = seg->link; 206 207 /* we only consider stem segments there! */ 208 if ( link && link->link == seg && link > seg ) 209 { 210 FT_Pos dist; 211 212 213 dist = seg->pos - link->pos; 214 if ( dist < 0 ) 215 dist = -dist; 216 217 if ( num_widths < AF_CJK_MAX_WIDTHS ) 218 axis->widths[num_widths++].org = dist; 219 } 220 } 221 222 /* this also replaces multiple almost identical stem widths */ 223 /* with a single one (the value 100 is heuristic) */ 224 af_sort_and_quantize_widths( &num_widths, axis->widths, 225 dummy->units_per_em / 100 ); 226 axis->width_count = num_widths; 227 } 228 229 Exit: 230 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 231 { 232 AF_CJKAxis axis = &metrics->axis[dim]; 233 FT_Pos stdw; 234 235 236 stdw = ( axis->width_count > 0 ) ? axis->widths[0].org 237 : AF_LATIN_CONSTANT( metrics, 50 ); 238 239 /* let's try 20% of the smallest width */ 240 axis->edge_distance_threshold = stdw / 5; 241 axis->standard_width = stdw; 242 axis->extra_light = 0; 243 244 #ifdef FT_DEBUG_LEVEL_TRACE 245 { 246 FT_UInt i; 247 248 249 FT_TRACE5(( "%s widths:\n", 250 dim == AF_DIMENSION_VERT ? "horizontal" 251 : "vertical" )); 252 253 FT_TRACE5(( " %ld (standard)", axis->standard_width )); 254 for ( i = 1; i < axis->width_count; i++ ) 255 FT_TRACE5(( " %ld", axis->widths[i].org )); 256 257 FT_TRACE5(( "\n" )); 258 } 259 #endif 260 } 261 } 262 263 FT_TRACE5(( "\n" )); 264 265 af_glyph_hints_done( hints ); 266 } 267 268 269 /* Find all blue zones. */ 270 271 static void 272 af_cjk_metrics_init_blues( AF_CJKMetrics metrics, 273 FT_Face face ) 274 { 275 FT_Pos fills[AF_BLUE_STRING_MAX_LEN]; 276 FT_Pos flats[AF_BLUE_STRING_MAX_LEN]; 277 278 FT_UInt num_fills; 279 FT_UInt num_flats; 280 281 FT_Bool fill; 282 283 AF_CJKBlue blue; 284 FT_Error error; 285 AF_CJKAxis axis; 286 FT_Outline outline; 287 288 AF_StyleClass sc = metrics->root.style_class; 289 290 AF_Blue_Stringset bss = sc->blue_stringset; 291 const AF_Blue_StringRec* bs = &af_blue_stringsets[bss]; 292 293 /* If HarfBuzz is not available, we need a pointer to a single */ 294 /* unsigned long value. */ 295 FT_ULong shaper_buf_; 296 void* shaper_buf = &shaper_buf_; 297 298 299 /* we walk over the blue character strings as specified in the */ 300 /* style's entry in the `af_blue_stringset' array, computing its */ 301 /* extremum points (depending on the string properties) */ 302 303 FT_TRACE5(( "cjk blue zones computation\n" )); 304 FT_TRACE5(( "==========================\n" )); 305 FT_TRACE5(( "\n" )); 306 307 if ( ft_hb_enabled( metrics->root.globals ) ) 308 shaper_buf = af_shaper_buf_create( metrics->root.globals ); 309 310 for ( ; bs->string != AF_BLUE_STRING_MAX; bs++ ) 311 { 312 const char* p = &af_blue_strings[bs->string]; 313 FT_Pos* blue_ref; 314 FT_Pos* blue_shoot; 315 316 317 if ( AF_CJK_IS_HORIZ_BLUE( bs ) ) 318 axis = &metrics->axis[AF_DIMENSION_HORZ]; 319 else 320 axis = &metrics->axis[AF_DIMENSION_VERT]; 321 322 #ifdef FT_DEBUG_LEVEL_TRACE 323 { 324 FT_String* cjk_blue_name[4] = 325 { 326 (FT_String*)"bottom", /* -- , -- */ 327 (FT_String*)"top", /* -- , TOP */ 328 (FT_String*)"left", /* HORIZ, -- */ 329 (FT_String*)"right" /* HORIZ, TOP */ 330 }; 331 332 333 FT_TRACE5(( "blue zone %u (%s):\n", 334 axis->blue_count, 335 cjk_blue_name[AF_CJK_IS_HORIZ_BLUE( bs ) | 336 AF_CJK_IS_TOP_BLUE( bs ) ] )); 337 } 338 #endif /* FT_DEBUG_LEVEL_TRACE */ 339 340 num_fills = 0; 341 num_flats = 0; 342 343 fill = 1; /* start with characters that define fill values */ 344 FT_TRACE5(( " [overshoot values]\n" )); 345 346 while ( *p ) 347 { 348 FT_ULong glyph_index; 349 FT_Pos best_pos; /* same as points.y or points.x, resp. */ 350 FT_Int best_point; 351 FT_Vector* points; 352 353 unsigned int num_idx; 354 355 #ifdef FT_DEBUG_LEVEL_TRACE 356 const char* p_old; 357 FT_ULong ch; 358 #endif 359 360 361 while ( *p == ' ' ) 362 p++; 363 364 #ifdef FT_DEBUG_LEVEL_TRACE 365 p_old = p; 366 GET_UTF8_CHAR( ch, p_old ); 367 #endif 368 369 /* switch to characters that define flat values */ 370 if ( *p == '|' ) 371 { 372 fill = 0; 373 FT_TRACE5(( " [reference values]\n" )); 374 p++; 375 continue; 376 } 377 378 /* reject input that maps to more than a single glyph */ 379 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx ); 380 if ( num_idx > 1 ) 381 continue; 382 383 /* load the character in the face -- skip unknown or empty ones */ 384 glyph_index = af_shaper_get_elem( &metrics->root, 385 shaper_buf, 386 0, 387 NULL, 388 NULL ); 389 if ( glyph_index == 0 ) 390 { 391 FT_TRACE5(( " U+%04lX unavailable\n", ch )); 392 continue; 393 } 394 395 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 396 outline = face->glyph->outline; 397 if ( error || outline.n_points <= 2 ) 398 { 399 FT_TRACE5(( " U+%04lX contains no (usable) outlines\n", ch )); 400 continue; 401 } 402 403 /* now compute min or max point indices and coordinates */ 404 points = outline.points; 405 best_point = -1; 406 best_pos = 0; /* make compiler happy */ 407 408 { 409 FT_Int nn; 410 FT_Int pp, first, last; 411 412 413 last = -1; 414 for ( nn = 0; nn < outline.n_contours; nn++ ) 415 { 416 first = last + 1; 417 last = outline.contours[nn]; 418 419 /* Avoid single-point contours since they are never rasterized. */ 420 /* In some fonts, they correspond to mark attachment points */ 421 /* which are way outside of the glyph's real outline. */ 422 if ( last <= first ) 423 continue; 424 425 if ( AF_CJK_IS_HORIZ_BLUE( bs ) ) 426 { 427 if ( AF_CJK_IS_RIGHT_BLUE( bs ) ) 428 { 429 for ( pp = first; pp <= last; pp++ ) 430 if ( best_point < 0 || points[pp].x > best_pos ) 431 { 432 best_point = pp; 433 best_pos = points[pp].x; 434 } 435 } 436 else 437 { 438 for ( pp = first; pp <= last; pp++ ) 439 if ( best_point < 0 || points[pp].x < best_pos ) 440 { 441 best_point = pp; 442 best_pos = points[pp].x; 443 } 444 } 445 } 446 else 447 { 448 if ( AF_CJK_IS_TOP_BLUE( bs ) ) 449 { 450 for ( pp = first; pp <= last; pp++ ) 451 if ( best_point < 0 || points[pp].y > best_pos ) 452 { 453 best_point = pp; 454 best_pos = points[pp].y; 455 } 456 } 457 else 458 { 459 for ( pp = first; pp <= last; pp++ ) 460 if ( best_point < 0 || points[pp].y < best_pos ) 461 { 462 best_point = pp; 463 best_pos = points[pp].y; 464 } 465 } 466 } 467 } 468 469 FT_TRACE5(( " U+%04lX: best_pos = %5ld\n", ch, best_pos )); 470 } 471 472 if ( fill ) 473 fills[num_fills++] = best_pos; 474 else 475 flats[num_flats++] = best_pos; 476 477 } /* end while loop */ 478 479 if ( num_flats == 0 && num_fills == 0 ) 480 { 481 /* 482 * we couldn't find a single glyph to compute this blue zone, 483 * we will simply ignore it then 484 */ 485 FT_TRACE5(( " empty\n" )); 486 continue; 487 } 488 489 /* we have computed the contents of the `fill' and `flats' tables, */ 490 /* now determine the reference and overshoot position of the blue -- */ 491 /* we simply take the median value after a simple sort */ 492 af_sort_pos( num_fills, fills ); 493 af_sort_pos( num_flats, flats ); 494 495 blue = &axis->blues[axis->blue_count]; 496 blue_ref = &blue->ref.org; 497 blue_shoot = &blue->shoot.org; 498 499 axis->blue_count++; 500 501 if ( num_flats == 0 ) 502 { 503 *blue_ref = 504 *blue_shoot = fills[num_fills / 2]; 505 } 506 else if ( num_fills == 0 ) 507 { 508 *blue_ref = 509 *blue_shoot = flats[num_flats / 2]; 510 } 511 else 512 { 513 *blue_ref = fills[num_fills / 2]; 514 *blue_shoot = flats[num_flats / 2]; 515 } 516 517 /* make sure blue_ref >= blue_shoot for top/right or */ 518 /* vice versa for bottom/left */ 519 if ( *blue_shoot != *blue_ref ) 520 { 521 FT_Pos ref = *blue_ref; 522 FT_Pos shoot = *blue_shoot; 523 FT_Bool under_ref = FT_BOOL( shoot < ref ); 524 525 526 /* AF_CJK_IS_TOP_BLUE covers `right' and `top' */ 527 if ( AF_CJK_IS_TOP_BLUE( bs ) ^ under_ref ) 528 { 529 *blue_ref = 530 *blue_shoot = ( shoot + ref ) / 2; 531 532 FT_TRACE5(( " [reference smaller than overshoot," 533 " taking mean value]\n" )); 534 } 535 } 536 537 blue->flags = 0; 538 if ( AF_CJK_IS_TOP_BLUE( bs ) ) 539 blue->flags |= AF_CJK_BLUE_TOP; 540 541 FT_TRACE5(( " -> reference = %ld\n", *blue_ref )); 542 FT_TRACE5(( " overshoot = %ld\n", *blue_shoot )); 543 544 } /* end for loop */ 545 546 af_shaper_buf_destroy( metrics->root.globals, shaper_buf ); 547 548 FT_TRACE5(( "\n" )); 549 550 return; 551 } 552 553 554 /* Basically the Latin version with type AF_CJKMetrics for metrics. */ 555 556 FT_LOCAL_DEF( void ) 557 af_cjk_metrics_check_digits( AF_CJKMetrics metrics, 558 FT_Face face ) 559 { 560 FT_Bool started = 0, same_width = 1; 561 FT_Long advance = 0, old_advance = 0; 562 563 /* If HarfBuzz is not available, we need a pointer to a single */ 564 /* unsigned long value. */ 565 FT_ULong shaper_buf_; 566 void* shaper_buf = &shaper_buf_; 567 568 /* in all supported charmaps, digits have character codes 0x30-0x39 */ 569 const char digits[] = "0 1 2 3 4 5 6 7 8 9"; 570 const char* p; 571 572 FT_UNUSED( face ); 573 574 575 p = digits; 576 577 if ( ft_hb_enabled( metrics->root.globals ) ) 578 shaper_buf = af_shaper_buf_create( metrics->root.globals ); 579 580 while ( *p ) 581 { 582 FT_ULong glyph_index; 583 unsigned int num_idx; 584 585 586 /* reject input that maps to more than a single glyph */ 587 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx ); 588 if ( num_idx > 1 ) 589 continue; 590 591 glyph_index = af_shaper_get_elem( &metrics->root, 592 shaper_buf, 593 0, 594 &advance, 595 NULL ); 596 if ( !glyph_index ) 597 continue; 598 599 if ( started ) 600 { 601 if ( advance != old_advance ) 602 { 603 same_width = 0; 604 break; 605 } 606 } 607 else 608 { 609 old_advance = advance; 610 started = 1; 611 } 612 } 613 614 af_shaper_buf_destroy( metrics->root.globals, shaper_buf ); 615 616 metrics->root.digits_have_same_width = same_width; 617 } 618 619 620 /* Initialize global metrics. */ 621 622 FT_LOCAL_DEF( FT_Error ) 623 af_cjk_metrics_init( AF_StyleMetrics metrics_, /* AF_CJKMetrics */ 624 FT_Face face ) 625 { 626 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_; 627 FT_CharMap oldmap = face->charmap; 628 629 630 metrics->units_per_em = face->units_per_EM; 631 632 if ( !FT_Select_Charmap( face, FT_ENCODING_UNICODE ) ) 633 { 634 af_cjk_metrics_init_widths( metrics, face ); 635 af_cjk_metrics_init_blues( metrics, face ); 636 af_cjk_metrics_check_digits( metrics, face ); 637 } 638 639 face->charmap = oldmap; 640 return FT_Err_Ok; 641 } 642 643 644 /* Adjust scaling value, then scale and shift widths */ 645 /* and blue zones (if applicable) for given dimension. */ 646 647 static void 648 af_cjk_metrics_scale_dim( AF_CJKMetrics metrics, 649 AF_Scaler scaler, 650 AF_Dimension dim ) 651 { 652 FT_Fixed scale; 653 FT_Pos delta; 654 AF_CJKAxis axis; 655 FT_UInt nn; 656 657 658 if ( dim == AF_DIMENSION_HORZ ) 659 { 660 scale = scaler->x_scale; 661 delta = scaler->x_delta; 662 } 663 else 664 { 665 scale = scaler->y_scale; 666 delta = scaler->y_delta; 667 } 668 669 axis = &metrics->axis[dim]; 670 671 if ( axis->org_scale == scale && axis->org_delta == delta ) 672 return; 673 674 axis->org_scale = scale; 675 axis->org_delta = delta; 676 677 axis->scale = scale; 678 axis->delta = delta; 679 680 /* scale the blue zones */ 681 for ( nn = 0; nn < axis->blue_count; nn++ ) 682 { 683 AF_CJKBlue blue = &axis->blues[nn]; 684 FT_Pos dist; 685 686 687 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 688 blue->ref.fit = blue->ref.cur; 689 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 690 blue->shoot.fit = blue->shoot.cur; 691 blue->flags &= ~AF_CJK_BLUE_ACTIVE; 692 693 /* a blue zone is only active if it is less than 3/4 pixels tall */ 694 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 695 if ( dist <= 48 && dist >= -48 ) 696 { 697 FT_Pos delta1, delta2; 698 699 700 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 701 702 /* shoot is under shoot for cjk */ 703 delta1 = FT_DivFix( blue->ref.fit, scale ) - blue->shoot.org; 704 delta2 = delta1; 705 if ( delta1 < 0 ) 706 delta2 = -delta2; 707 708 delta2 = FT_MulFix( delta2, scale ); 709 710 FT_TRACE5(( "delta: %ld", delta1 )); 711 if ( delta2 < 32 ) 712 delta2 = 0; 713 #if 0 714 else if ( delta2 < 64 ) 715 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 716 #endif 717 else 718 delta2 = FT_PIX_ROUND( delta2 ); 719 FT_TRACE5(( "/%ld\n", delta2 )); 720 721 if ( delta1 < 0 ) 722 delta2 = -delta2; 723 724 blue->shoot.fit = blue->ref.fit - delta2; 725 726 FT_TRACE5(( ">> active cjk blue zone %c%u[%ld/%ld]:\n", 727 ( dim == AF_DIMENSION_HORZ ) ? 'H' : 'V', 728 nn, blue->ref.org, blue->shoot.org )); 729 FT_TRACE5(( " ref: cur=%.2f fit=%.2f\n", 730 (double)blue->ref.cur / 64, 731 (double)blue->ref.fit / 64 )); 732 FT_TRACE5(( " shoot: cur=%.2f fit=%.2f\n", 733 (double)blue->shoot.cur / 64, 734 (double)blue->shoot.fit / 64 )); 735 736 blue->flags |= AF_CJK_BLUE_ACTIVE; 737 } 738 } 739 } 740 741 742 /* Scale global values in both directions. */ 743 744 FT_LOCAL_DEF( void ) 745 af_cjk_metrics_scale( AF_StyleMetrics metrics_, /* AF_CJKMetrics */ 746 AF_Scaler scaler ) 747 { 748 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_; 749 750 751 /* we copy the whole structure since the x and y scaling values */ 752 /* are not modified, contrary to e.g. the `latin' auto-hinter */ 753 metrics->root.scaler = *scaler; 754 755 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 756 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 757 } 758 759 760 /* Extract standard_width from writing system/script specific */ 761 /* metrics class. */ 762 763 FT_CALLBACK_DEF( void ) 764 af_cjk_get_standard_widths( AF_StyleMetrics metrics_, /* AF_CJKMetrics */ 765 FT_Pos* stdHW, 766 FT_Pos* stdVW ) 767 { 768 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_; 769 770 771 if ( stdHW ) 772 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width; 773 774 if ( stdVW ) 775 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width; 776 } 777 778 779 /*************************************************************************/ 780 /*************************************************************************/ 781 /***** *****/ 782 /***** C J K G L Y P H A N A L Y S I S *****/ 783 /***** *****/ 784 /*************************************************************************/ 785 /*************************************************************************/ 786 787 788 /* Walk over all contours and compute its segments. */ 789 790 static FT_Error 791 af_cjk_hints_compute_segments( AF_GlyphHints hints, 792 AF_Dimension dim ) 793 { 794 AF_AxisHints axis = &hints->axis[dim]; 795 AF_Segment segments = axis->segments; 796 AF_Segment segment_limit = FT_OFFSET( segments, axis->num_segments ); 797 FT_Error error; 798 AF_Segment seg; 799 800 801 error = af_latin_hints_compute_segments( hints, dim ); 802 if ( error ) 803 return error; 804 805 /* a segment is round if it doesn't have successive */ 806 /* on-curve points. */ 807 for ( seg = segments; seg < segment_limit; seg++ ) 808 { 809 AF_Point pt = seg->first; 810 AF_Point last = seg->last; 811 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL; 812 FT_UInt f1; 813 814 815 seg->flags &= ~AF_EDGE_ROUND; 816 817 for ( ; pt != last; f0 = f1 ) 818 { 819 pt = pt->next; 820 f1 = pt->flags & AF_FLAG_CONTROL; 821 822 if ( !f0 && !f1 ) 823 break; 824 825 if ( pt == last ) 826 seg->flags |= AF_EDGE_ROUND; 827 } 828 } 829 830 return FT_Err_Ok; 831 } 832 833 834 static void 835 af_cjk_hints_link_segments( AF_GlyphHints hints, 836 AF_Dimension dim ) 837 { 838 AF_AxisHints axis = &hints->axis[dim]; 839 AF_Segment segments = axis->segments; 840 AF_Segment segment_limit = FT_OFFSET( segments, axis->num_segments ); 841 AF_Direction major_dir = axis->major_dir; 842 AF_Segment seg1, seg2; 843 FT_Pos len_threshold; 844 FT_Pos dist_threshold; 845 846 847 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 848 849 dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 850 : hints->y_scale; 851 dist_threshold = FT_DivFix( 64 * 3, dist_threshold ); 852 853 /* now compare each segment to the others */ 854 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 855 { 856 if ( seg1->dir != major_dir ) 857 continue; 858 859 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 860 if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 ) 861 { 862 FT_Pos dist = seg2->pos - seg1->pos; 863 864 865 if ( dist < 0 ) 866 continue; 867 868 { 869 FT_Pos min = seg1->min_coord; 870 FT_Pos max = seg1->max_coord; 871 FT_Pos len; 872 873 874 if ( min < seg2->min_coord ) 875 min = seg2->min_coord; 876 877 if ( max > seg2->max_coord ) 878 max = seg2->max_coord; 879 880 len = max - min; 881 if ( len >= len_threshold ) 882 { 883 if ( dist * 8 < seg1->score * 9 && 884 ( dist * 8 < seg1->score * 7 || seg1->len < len ) ) 885 { 886 seg1->score = dist; 887 seg1->len = len; 888 seg1->link = seg2; 889 } 890 891 if ( dist * 8 < seg2->score * 9 && 892 ( dist * 8 < seg2->score * 7 || seg2->len < len ) ) 893 { 894 seg2->score = dist; 895 seg2->len = len; 896 seg2->link = seg1; 897 } 898 } 899 } 900 } 901 } 902 903 /* 904 * now compute the `serif' segments 905 * 906 * In Hanzi, some strokes are wider on one or both of the ends. 907 * We either identify the stems on the ends as serifs or remove 908 * the linkage, depending on the length of the stems. 909 * 910 */ 911 912 { 913 AF_Segment link1, link2; 914 915 916 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 917 { 918 link1 = seg1->link; 919 if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos ) 920 continue; 921 922 if ( seg1->score >= dist_threshold ) 923 continue; 924 925 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 926 { 927 if ( seg2->pos > seg1->pos || seg1 == seg2 ) 928 continue; 929 930 link2 = seg2->link; 931 if ( !link2 || link2->link != seg2 || link2->pos < link1->pos ) 932 continue; 933 934 if ( seg1->pos == seg2->pos && link1->pos == link2->pos ) 935 continue; 936 937 if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score ) 938 continue; 939 940 /* seg2 < seg1 < link1 < link2 */ 941 942 if ( seg1->len >= seg2->len * 3 ) 943 { 944 AF_Segment seg; 945 946 947 for ( seg = segments; seg < segment_limit; seg++ ) 948 { 949 AF_Segment link = seg->link; 950 951 952 if ( link == seg2 ) 953 { 954 seg->link = NULL; 955 seg->serif = link1; 956 } 957 else if ( link == link2 ) 958 { 959 seg->link = NULL; 960 seg->serif = seg1; 961 } 962 } 963 } 964 else 965 { 966 seg1->link = link1->link = NULL; 967 968 break; 969 } 970 } 971 } 972 } 973 974 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 975 { 976 seg2 = seg1->link; 977 978 if ( seg2 ) 979 { 980 if ( seg2->link != seg1 ) 981 { 982 seg1->link = NULL; 983 984 if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 ) 985 seg1->serif = seg2->link; 986 } 987 } 988 } 989 } 990 991 992 static FT_Error 993 af_cjk_hints_compute_edges( AF_GlyphHints hints, 994 AF_Dimension dim ) 995 { 996 AF_AxisHints axis = &hints->axis[dim]; 997 FT_Error error = FT_Err_Ok; 998 FT_Memory memory = hints->memory; 999 AF_CJKAxis laxis = &((AF_CJKMetrics)hints->metrics)->axis[dim]; 1000 1001 AF_Segment segments = axis->segments; 1002 AF_Segment segment_limit = FT_OFFSET( segments, axis->num_segments ); 1003 AF_Segment seg; 1004 1005 FT_Fixed scale; 1006 FT_Pos edge_distance_threshold; 1007 1008 1009 axis->num_edges = 0; 1010 1011 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 1012 : hints->y_scale; 1013 1014 /********************************************************************** 1015 * 1016 * We begin by generating a sorted table of edges for the current 1017 * direction. To do so, we simply scan each segment and try to find 1018 * an edge in our table that corresponds to its position. 1019 * 1020 * If no edge is found, we create and insert a new edge in the 1021 * sorted table. Otherwise, we simply add the segment to the edge's 1022 * list which is then processed in the second step to compute the 1023 * edge's properties. 1024 * 1025 * Note that the edges table is sorted along the segment/edge 1026 * position. 1027 * 1028 */ 1029 1030 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1031 scale ); 1032 if ( edge_distance_threshold > 64 / 4 ) 1033 edge_distance_threshold = FT_DivFix( 64 / 4, scale ); 1034 else 1035 edge_distance_threshold = laxis->edge_distance_threshold; 1036 1037 for ( seg = segments; seg < segment_limit; seg++ ) 1038 { 1039 AF_Edge found = NULL; 1040 FT_Pos best = 0xFFFFU; 1041 FT_UInt ee; 1042 1043 1044 /* look for an edge corresponding to the segment */ 1045 for ( ee = 0; ee < axis->num_edges; ee++ ) 1046 { 1047 AF_Edge edge = axis->edges + ee; 1048 FT_Pos dist; 1049 1050 1051 if ( edge->dir != seg->dir ) 1052 continue; 1053 1054 dist = seg->pos - edge->fpos; 1055 if ( dist < 0 ) 1056 dist = -dist; 1057 1058 if ( dist < edge_distance_threshold && dist < best ) 1059 { 1060 AF_Segment link = seg->link; 1061 1062 1063 /* check whether all linked segments of the candidate edge */ 1064 /* can make a single edge. */ 1065 if ( link ) 1066 { 1067 AF_Segment seg1 = edge->first; 1068 FT_Pos dist2 = 0; 1069 1070 1071 do 1072 { 1073 AF_Segment link1 = seg1->link; 1074 1075 1076 if ( link1 ) 1077 { 1078 dist2 = AF_SEGMENT_DIST( link, link1 ); 1079 if ( dist2 >= edge_distance_threshold ) 1080 break; 1081 } 1082 1083 } while ( ( seg1 = seg1->edge_next ) != edge->first ); 1084 1085 if ( dist2 >= edge_distance_threshold ) 1086 continue; 1087 } 1088 1089 best = dist; 1090 found = edge; 1091 } 1092 } 1093 1094 if ( !found ) 1095 { 1096 AF_Edge edge; 1097 1098 1099 /* insert a new edge in the list and */ 1100 /* sort according to the position */ 1101 error = af_axis_hints_new_edge( axis, seg->pos, 1102 (AF_Direction)seg->dir, 0, 1103 memory, &edge ); 1104 if ( error ) 1105 goto Exit; 1106 1107 /* add the segment to the new edge's list */ 1108 FT_ZERO( edge ); 1109 1110 edge->first = seg; 1111 edge->last = seg; 1112 edge->dir = seg->dir; 1113 edge->fpos = seg->pos; 1114 edge->opos = FT_MulFix( seg->pos, scale ); 1115 edge->pos = edge->opos; 1116 seg->edge_next = seg; 1117 } 1118 else 1119 { 1120 /* if an edge was found, simply add the segment to the edge's */ 1121 /* list */ 1122 seg->edge_next = found->first; 1123 found->last->edge_next = seg; 1124 found->last = seg; 1125 } 1126 } 1127 1128 /******************************************************************* 1129 * 1130 * Good, we now compute each edge's properties according to the 1131 * segments found on its position. Basically, these are 1132 * 1133 * - the edge's main direction 1134 * - stem edge, serif edge or both (which defaults to stem then) 1135 * - rounded edge, straight or both (which defaults to straight) 1136 * - link for edge 1137 * 1138 */ 1139 1140 /* first of all, set the `edge' field in each segment -- this is */ 1141 /* required in order to compute edge links */ 1142 1143 /* 1144 * Note that removing this loop and setting the `edge' field of each 1145 * segment directly in the code above slows down execution speed for 1146 * some reasons on platforms like the Sun. 1147 */ 1148 { 1149 AF_Edge edges = axis->edges; 1150 AF_Edge edge_limit = FT_OFFSET( edges, axis->num_edges ); 1151 AF_Edge edge; 1152 1153 1154 for ( edge = edges; edge < edge_limit; edge++ ) 1155 { 1156 seg = edge->first; 1157 if ( seg ) 1158 do 1159 { 1160 seg->edge = edge; 1161 seg = seg->edge_next; 1162 1163 } while ( seg != edge->first ); 1164 } 1165 1166 /* now compute each edge properties */ 1167 for ( edge = edges; edge < edge_limit; edge++ ) 1168 { 1169 FT_Int is_round = 0; /* does it contain round segments? */ 1170 FT_Int is_straight = 0; /* does it contain straight segments? */ 1171 1172 1173 seg = edge->first; 1174 if ( !seg ) 1175 goto Skip_Loop; 1176 1177 do 1178 { 1179 FT_Bool is_serif; 1180 1181 1182 /* check for roundness of segment */ 1183 if ( seg->flags & AF_EDGE_ROUND ) 1184 is_round++; 1185 else 1186 is_straight++; 1187 1188 /* check for links -- if seg->serif is set, then seg->link must */ 1189 /* be ignored */ 1190 is_serif = FT_BOOL( seg->serif && seg->serif->edge != edge ); 1191 1192 if ( seg->link || is_serif ) 1193 { 1194 AF_Edge edge2; 1195 AF_Segment seg2; 1196 1197 1198 edge2 = edge->link; 1199 seg2 = seg->link; 1200 1201 if ( is_serif ) 1202 { 1203 seg2 = seg->serif; 1204 edge2 = edge->serif; 1205 } 1206 1207 if ( edge2 ) 1208 { 1209 FT_Pos edge_delta; 1210 FT_Pos seg_delta; 1211 1212 1213 edge_delta = edge->fpos - edge2->fpos; 1214 if ( edge_delta < 0 ) 1215 edge_delta = -edge_delta; 1216 1217 seg_delta = AF_SEGMENT_DIST( seg, seg2 ); 1218 1219 if ( seg_delta < edge_delta ) 1220 edge2 = seg2->edge; 1221 } 1222 else 1223 edge2 = seg2->edge; 1224 1225 if ( is_serif ) 1226 { 1227 edge->serif = edge2; 1228 edge2->flags |= AF_EDGE_SERIF; 1229 } 1230 else 1231 edge->link = edge2; 1232 } 1233 1234 seg = seg->edge_next; 1235 1236 } while ( seg != edge->first ); 1237 1238 Skip_Loop: 1239 /* set the round/straight flags */ 1240 edge->flags = AF_EDGE_NORMAL; 1241 1242 if ( is_round > 0 && is_round >= is_straight ) 1243 edge->flags |= AF_EDGE_ROUND; 1244 1245 /* get rid of serifs if link is set */ 1246 /* XXX: This gets rid of many unpleasant artefacts! */ 1247 /* Example: the `c' in cour.pfa at size 13 */ 1248 1249 if ( edge->serif && edge->link ) 1250 edge->serif = NULL; 1251 } 1252 } 1253 1254 Exit: 1255 return error; 1256 } 1257 1258 1259 /* Detect segments and edges for given dimension. */ 1260 1261 static FT_Error 1262 af_cjk_hints_detect_features( AF_GlyphHints hints, 1263 AF_Dimension dim ) 1264 { 1265 FT_Error error; 1266 1267 1268 error = af_cjk_hints_compute_segments( hints, dim ); 1269 if ( !error ) 1270 { 1271 af_cjk_hints_link_segments( hints, dim ); 1272 1273 error = af_cjk_hints_compute_edges( hints, dim ); 1274 } 1275 return error; 1276 } 1277 1278 1279 /* Compute all edges which lie within blue zones. */ 1280 1281 static void 1282 af_cjk_hints_compute_blue_edges( AF_GlyphHints hints, 1283 AF_CJKMetrics metrics, 1284 AF_Dimension dim ) 1285 { 1286 AF_AxisHints axis = &hints->axis[dim]; 1287 AF_Edge edge = axis->edges; 1288 AF_Edge edge_limit = FT_OFFSET( edge, axis->num_edges ); 1289 AF_CJKAxis cjk = &metrics->axis[dim]; 1290 FT_Fixed scale = cjk->scale; 1291 FT_Pos best_dist0; /* initial threshold */ 1292 1293 1294 /* compute the initial threshold as a fraction of the EM size */ 1295 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1296 1297 if ( best_dist0 > 64 / 2 ) /* maximum 1/2 pixel */ 1298 best_dist0 = 64 / 2; 1299 1300 /* compute which blue zones are active, i.e. have their scaled */ 1301 /* size < 3/4 pixels */ 1302 1303 /* If the distant between an edge and a blue zone is shorter than */ 1304 /* best_dist0, set the blue zone for the edge. Then search for */ 1305 /* the blue zone with the smallest best_dist to the edge. */ 1306 1307 for ( ; edge < edge_limit; edge++ ) 1308 { 1309 FT_UInt bb; 1310 AF_Width best_blue = NULL; 1311 FT_Pos best_dist = best_dist0; 1312 1313 1314 for ( bb = 0; bb < cjk->blue_count; bb++ ) 1315 { 1316 AF_CJKBlue blue = cjk->blues + bb; 1317 FT_Bool is_top_right_blue, is_major_dir; 1318 1319 1320 /* skip inactive blue zones (i.e., those that are too small) */ 1321 if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) ) 1322 continue; 1323 1324 /* if it is a top zone, check for right edges -- if it is a bottom */ 1325 /* zone, check for left edges */ 1326 /* */ 1327 /* of course, that's for TrueType */ 1328 is_top_right_blue = 1329 (FT_Byte)( ( blue->flags & AF_CJK_BLUE_TOP ) != 0 ); 1330 is_major_dir = 1331 FT_BOOL( edge->dir == axis->major_dir ); 1332 1333 /* if it is a top zone, the edge must be against the major */ 1334 /* direction; if it is a bottom zone, it must be in the major */ 1335 /* direction */ 1336 if ( is_top_right_blue ^ is_major_dir ) 1337 { 1338 FT_Pos dist; 1339 AF_Width compare; 1340 1341 1342 /* Compare the edge to the closest blue zone type */ 1343 if ( FT_ABS( edge->fpos - blue->ref.org ) > 1344 FT_ABS( edge->fpos - blue->shoot.org ) ) 1345 compare = &blue->shoot; 1346 else 1347 compare = &blue->ref; 1348 1349 dist = edge->fpos - compare->org; 1350 if ( dist < 0 ) 1351 dist = -dist; 1352 1353 dist = FT_MulFix( dist, scale ); 1354 if ( dist < best_dist ) 1355 { 1356 best_dist = dist; 1357 best_blue = compare; 1358 } 1359 } 1360 } 1361 1362 if ( best_blue ) 1363 edge->blue_edge = best_blue; 1364 } 1365 } 1366 1367 1368 /* Initialize hinting engine. */ 1369 1370 FT_LOCAL_DEF( FT_Error ) 1371 af_cjk_hints_init( AF_GlyphHints hints, 1372 AF_StyleMetrics metrics_ ) /* AF_CJKMetrics */ 1373 { 1374 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_; 1375 FT_Render_Mode mode; 1376 FT_UInt32 scaler_flags, other_flags; 1377 1378 1379 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics ); 1380 1381 /* 1382 * correct x_scale and y_scale when needed, since they may have 1383 * been modified af_cjk_scale_dim above 1384 */ 1385 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1386 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1387 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1388 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1389 1390 /* compute flags depending on render mode, etc. */ 1391 mode = metrics->root.scaler.render_mode; 1392 1393 scaler_flags = hints->scaler_flags; 1394 other_flags = 0; 1395 1396 /* 1397 * We snap the width of vertical stems for the monochrome and 1398 * horizontal LCD rendering targets only. 1399 */ 1400 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1401 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1402 1403 /* 1404 * We snap the width of horizontal stems for the monochrome and 1405 * vertical LCD rendering targets only. 1406 */ 1407 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1408 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1409 1410 /* 1411 * We adjust stems to full pixels unless in `light' or `lcd' mode. 1412 */ 1413 if ( mode != FT_RENDER_MODE_LIGHT && mode != FT_RENDER_MODE_LCD ) 1414 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1415 1416 if ( mode == FT_RENDER_MODE_MONO ) 1417 other_flags |= AF_LATIN_HINTS_MONO; 1418 1419 scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE; 1420 1421 hints->scaler_flags = scaler_flags; 1422 hints->other_flags = other_flags; 1423 1424 return FT_Err_Ok; 1425 } 1426 1427 1428 /*************************************************************************/ 1429 /*************************************************************************/ 1430 /***** *****/ 1431 /***** C J K G L Y P H G R I D - F I T T I N G *****/ 1432 /***** *****/ 1433 /*************************************************************************/ 1434 /*************************************************************************/ 1435 1436 /* Snap a given width in scaled coordinates to one of the */ 1437 /* current standard widths. */ 1438 1439 static FT_Pos 1440 af_cjk_snap_width( AF_Width widths, 1441 FT_UInt count, 1442 FT_Pos width ) 1443 { 1444 FT_UInt n; 1445 FT_Pos best = 64 + 32 + 2; 1446 FT_Pos reference = width; 1447 FT_Pos scaled; 1448 1449 1450 for ( n = 0; n < count; n++ ) 1451 { 1452 FT_Pos w; 1453 FT_Pos dist; 1454 1455 1456 w = widths[n].cur; 1457 dist = width - w; 1458 if ( dist < 0 ) 1459 dist = -dist; 1460 if ( dist < best ) 1461 { 1462 best = dist; 1463 reference = w; 1464 } 1465 } 1466 1467 scaled = FT_PIX_ROUND( reference ); 1468 1469 if ( width >= reference ) 1470 { 1471 if ( width < scaled + 48 ) 1472 width = reference; 1473 } 1474 else 1475 { 1476 if ( width > scaled - 48 ) 1477 width = reference; 1478 } 1479 1480 return width; 1481 } 1482 1483 1484 /* Compute the snapped width of a given stem. */ 1485 /* There is a lot of voodoo in this function; changing the hard-coded */ 1486 /* parameters influence the whole hinting process. */ 1487 1488 static FT_Pos 1489 af_cjk_compute_stem_width( AF_GlyphHints hints, 1490 AF_Dimension dim, 1491 FT_Pos width, 1492 FT_UInt base_flags, 1493 FT_UInt stem_flags ) 1494 { 1495 AF_CJKMetrics metrics = (AF_CJKMetrics)hints->metrics; 1496 AF_CJKAxis axis = &metrics->axis[dim]; 1497 FT_Pos dist = width; 1498 FT_Int sign = 0; 1499 FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT ); 1500 1501 FT_UNUSED( base_flags ); 1502 FT_UNUSED( stem_flags ); 1503 1504 1505 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1506 return width; 1507 1508 if ( dist < 0 ) 1509 { 1510 dist = -width; 1511 sign = 1; 1512 } 1513 1514 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1515 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1516 { 1517 /* smooth hinting process: very lightly quantize the stem width */ 1518 1519 if ( axis->width_count > 0 ) 1520 { 1521 if ( FT_ABS( dist - axis->widths[0].cur ) < 40 ) 1522 { 1523 dist = axis->widths[0].cur; 1524 if ( dist < 48 ) 1525 dist = 48; 1526 1527 goto Done_Width; 1528 } 1529 } 1530 1531 if ( dist < 54 ) 1532 dist += ( 54 - dist ) / 2; 1533 else if ( dist < 3 * 64 ) 1534 { 1535 FT_Pos delta; 1536 1537 1538 delta = dist & 63; 1539 dist &= -64; 1540 1541 if ( delta < 10 ) 1542 dist += delta; 1543 else if ( delta < 22 ) 1544 dist += 10; 1545 else if ( delta < 42 ) 1546 dist += delta; 1547 else if ( delta < 54 ) 1548 dist += 54; 1549 else 1550 dist += delta; 1551 } 1552 } 1553 else 1554 { 1555 /* strong hinting process: snap the stem width to integer pixels */ 1556 1557 dist = af_cjk_snap_width( axis->widths, axis->width_count, dist ); 1558 1559 if ( vertical ) 1560 { 1561 /* in the case of vertical hinting, always round */ 1562 /* the stem heights to integer pixels */ 1563 1564 if ( dist >= 64 ) 1565 dist = ( dist + 16 ) & ~63; 1566 else 1567 dist = 64; 1568 } 1569 else 1570 { 1571 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1572 { 1573 /* monochrome horizontal hinting: snap widths to integer pixels */ 1574 /* with a different threshold */ 1575 1576 if ( dist < 64 ) 1577 dist = 64; 1578 else 1579 dist = ( dist + 32 ) & ~63; 1580 } 1581 else 1582 { 1583 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1584 /* approach: we strengthen small stems, round stems whose size */ 1585 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1586 1587 if ( dist < 48 ) 1588 dist = ( dist + 64 ) >> 1; 1589 1590 else if ( dist < 128 ) 1591 dist = ( dist + 22 ) & ~63; 1592 else 1593 /* round otherwise to prevent color fringes in LCD mode */ 1594 dist = ( dist + 32 ) & ~63; 1595 } 1596 } 1597 } 1598 1599 Done_Width: 1600 if ( sign ) 1601 dist = -dist; 1602 1603 return dist; 1604 } 1605 1606 1607 /* Align one stem edge relative to the previous stem edge. */ 1608 1609 static void 1610 af_cjk_align_linked_edge( AF_GlyphHints hints, 1611 AF_Dimension dim, 1612 AF_Edge base_edge, 1613 AF_Edge stem_edge ) 1614 { 1615 FT_Pos dist = stem_edge->opos - base_edge->opos; 1616 1617 FT_Pos fitted_width = af_cjk_compute_stem_width( hints, dim, dist, 1618 base_edge->flags, 1619 stem_edge->flags ); 1620 1621 1622 stem_edge->pos = base_edge->pos + fitted_width; 1623 1624 FT_TRACE5(( " CJKLINK: edge %td @%d (opos=%.2f) linked to %.2f," 1625 " dist was %.2f, now %.2f\n", 1626 stem_edge - hints->axis[dim].edges, stem_edge->fpos, 1627 (double)stem_edge->opos / 64, 1628 (double)stem_edge->pos / 64, 1629 (double)dist / 64, 1630 (double)fitted_width / 64 )); 1631 } 1632 1633 1634 /* Shift the coordinates of the `serif' edge by the same amount */ 1635 /* as the corresponding `base' edge has been moved already. */ 1636 1637 static void 1638 af_cjk_align_serif_edge( AF_GlyphHints hints, 1639 AF_Edge base, 1640 AF_Edge serif ) 1641 { 1642 FT_UNUSED( hints ); 1643 1644 serif->pos = base->pos + ( serif->opos - base->opos ); 1645 } 1646 1647 1648 /*************************************************************************/ 1649 /*************************************************************************/ 1650 /*************************************************************************/ 1651 /**** ****/ 1652 /**** E D G E H I N T I N G ****/ 1653 /**** ****/ 1654 /*************************************************************************/ 1655 /*************************************************************************/ 1656 /*************************************************************************/ 1657 1658 1659 #define AF_LIGHT_MODE_MAX_HORZ_GAP 9 1660 #define AF_LIGHT_MODE_MAX_VERT_GAP 15 1661 #define AF_LIGHT_MODE_MAX_DELTA_ABS 14 1662 1663 1664 static FT_Pos 1665 af_hint_normal_stem( AF_GlyphHints hints, 1666 AF_Edge edge, 1667 AF_Edge edge2, 1668 FT_Pos anchor, 1669 AF_Dimension dim ) 1670 { 1671 FT_Pos org_len, cur_len, org_center; 1672 FT_Pos cur_pos1, cur_pos2; 1673 FT_Pos d_off1, u_off1, d_off2, u_off2, delta; 1674 FT_Pos offset; 1675 FT_Pos threshold = 64; 1676 1677 1678 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1679 { 1680 if ( ( edge->flags & AF_EDGE_ROUND ) && 1681 ( edge2->flags & AF_EDGE_ROUND ) ) 1682 { 1683 if ( dim == AF_DIMENSION_VERT ) 1684 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP; 1685 else 1686 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP; 1687 } 1688 else 1689 { 1690 if ( dim == AF_DIMENSION_VERT ) 1691 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3; 1692 else 1693 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3; 1694 } 1695 } 1696 1697 org_len = edge2->opos - edge->opos; 1698 cur_len = af_cjk_compute_stem_width( hints, dim, org_len, 1699 edge->flags, 1700 edge2->flags ); 1701 1702 org_center = ( edge->opos + edge2->opos ) / 2 + anchor; 1703 cur_pos1 = org_center - cur_len / 2; 1704 cur_pos2 = cur_pos1 + cur_len; 1705 d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 ); 1706 d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 ); 1707 u_off1 = 64 - d_off1; 1708 u_off2 = 64 - d_off2; 1709 delta = 0; 1710 1711 1712 if ( d_off1 == 0 || d_off2 == 0 ) 1713 goto Exit; 1714 1715 if ( cur_len <= threshold ) 1716 { 1717 if ( d_off2 < cur_len ) 1718 { 1719 if ( u_off1 <= d_off2 ) 1720 delta = u_off1; 1721 else 1722 delta = -d_off2; 1723 } 1724 1725 goto Exit; 1726 } 1727 1728 if ( threshold < 64 ) 1729 { 1730 if ( d_off1 >= threshold || u_off1 >= threshold || 1731 d_off2 >= threshold || u_off2 >= threshold ) 1732 goto Exit; 1733 } 1734 1735 offset = cur_len & 63; 1736 1737 if ( offset < 32 ) 1738 { 1739 if ( u_off1 <= offset || d_off2 <= offset ) 1740 goto Exit; 1741 } 1742 else 1743 offset = 64 - threshold; 1744 1745 d_off1 = threshold - u_off1; 1746 u_off1 = u_off1 - offset; 1747 u_off2 = threshold - d_off2; 1748 d_off2 = d_off2 - offset; 1749 1750 if ( d_off1 <= u_off1 ) 1751 u_off1 = -d_off1; 1752 1753 if ( d_off2 <= u_off2 ) 1754 u_off2 = -d_off2; 1755 1756 if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) ) 1757 delta = u_off1; 1758 else 1759 delta = u_off2; 1760 1761 Exit: 1762 1763 #if 1 1764 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1765 { 1766 if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS ) 1767 delta = AF_LIGHT_MODE_MAX_DELTA_ABS; 1768 else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS ) 1769 delta = -AF_LIGHT_MODE_MAX_DELTA_ABS; 1770 } 1771 #endif 1772 1773 cur_pos1 += delta; 1774 1775 if ( edge->opos < edge2->opos ) 1776 { 1777 edge->pos = cur_pos1; 1778 edge2->pos = cur_pos1 + cur_len; 1779 } 1780 else 1781 { 1782 edge->pos = cur_pos1 + cur_len; 1783 edge2->pos = cur_pos1; 1784 } 1785 1786 return delta; 1787 } 1788 1789 1790 /* The main grid-fitting routine. */ 1791 1792 static void 1793 af_cjk_hint_edges( AF_GlyphHints hints, 1794 AF_Dimension dim ) 1795 { 1796 AF_AxisHints axis = &hints->axis[dim]; 1797 AF_Edge edges = axis->edges; 1798 AF_Edge edge_limit = FT_OFFSET( edges, axis->num_edges ); 1799 FT_PtrDist n_edges; 1800 AF_Edge edge; 1801 AF_Edge anchor = NULL; 1802 FT_Pos delta = 0; 1803 FT_Int skipped = 0; 1804 FT_Bool has_last_stem = FALSE; 1805 FT_Pos last_stem_pos = 0; 1806 1807 #ifdef FT_DEBUG_LEVEL_TRACE 1808 FT_UInt num_actions = 0; 1809 #endif 1810 1811 1812 FT_TRACE5(( "cjk %s edge hinting (style `%s')\n", 1813 dim == AF_DIMENSION_VERT ? "horizontal" : "vertical", 1814 af_style_names[hints->metrics->style_class->style] )); 1815 1816 /* we begin by aligning all stems relative to the blue zone */ 1817 1818 if ( AF_HINTS_DO_BLUES( hints ) ) 1819 { 1820 for ( edge = edges; edge < edge_limit; edge++ ) 1821 { 1822 AF_Width blue; 1823 AF_Edge edge1, edge2; 1824 1825 1826 if ( edge->flags & AF_EDGE_DONE ) 1827 continue; 1828 1829 blue = edge->blue_edge; 1830 edge1 = NULL; 1831 edge2 = edge->link; 1832 1833 if ( blue ) 1834 { 1835 edge1 = edge; 1836 } 1837 else if ( edge2 && edge2->blue_edge ) 1838 { 1839 blue = edge2->blue_edge; 1840 edge1 = edge2; 1841 edge2 = edge; 1842 } 1843 1844 if ( !edge1 ) 1845 continue; 1846 1847 #ifdef FT_DEBUG_LEVEL_TRACE 1848 FT_TRACE5(( " CJKBLUE: edge %td @%d (opos=%.2f) snapped to %.2f," 1849 " was %.2f\n", 1850 edge1 - edges, edge1->fpos, (double)edge1->opos / 64, 1851 (double)blue->fit / 64, (double)edge1->pos / 64 )); 1852 1853 num_actions++; 1854 #endif 1855 1856 edge1->pos = blue->fit; 1857 edge1->flags |= AF_EDGE_DONE; 1858 1859 if ( edge2 && !edge2->blue_edge ) 1860 { 1861 af_cjk_align_linked_edge( hints, dim, edge1, edge2 ); 1862 edge2->flags |= AF_EDGE_DONE; 1863 1864 #ifdef FT_DEBUG_LEVEL_TRACE 1865 num_actions++; 1866 #endif 1867 } 1868 1869 if ( !anchor ) 1870 anchor = edge; 1871 } 1872 } 1873 1874 /* now we align all stem edges. */ 1875 for ( edge = edges; edge < edge_limit; edge++ ) 1876 { 1877 AF_Edge edge2; 1878 1879 1880 if ( edge->flags & AF_EDGE_DONE ) 1881 continue; 1882 1883 /* skip all non-stem edges */ 1884 edge2 = edge->link; 1885 if ( !edge2 ) 1886 { 1887 skipped++; 1888 continue; 1889 } 1890 1891 /* Some CJK characters have so many stems that 1892 * the hinter is likely to merge two adjacent ones. 1893 * To solve this problem, if either edge of a stem 1894 * is too close to the previous one, we avoid 1895 * aligning the two edges, but rather interpolate 1896 * their locations at the end of this function in 1897 * order to preserve the space between the stems. 1898 */ 1899 if ( has_last_stem && 1900 ( edge->pos < last_stem_pos + 64 || 1901 edge2->pos < last_stem_pos + 64 ) ) 1902 { 1903 skipped++; 1904 continue; 1905 } 1906 1907 /* now align the stem */ 1908 1909 /* this should not happen, but it's better to be safe */ 1910 if ( edge2->blue_edge ) 1911 { 1912 FT_TRACE5(( "ASSERTION FAILED for edge %td\n", edge2 - edges )); 1913 1914 af_cjk_align_linked_edge( hints, dim, edge2, edge ); 1915 edge->flags |= AF_EDGE_DONE; 1916 1917 #ifdef FT_DEBUG_LEVEL_TRACE 1918 num_actions++; 1919 #endif 1920 1921 continue; 1922 } 1923 1924 if ( edge2 < edge ) 1925 { 1926 af_cjk_align_linked_edge( hints, dim, edge2, edge ); 1927 edge->flags |= AF_EDGE_DONE; 1928 1929 #ifdef FT_DEBUG_LEVEL_TRACE 1930 num_actions++; 1931 #endif 1932 1933 /* We rarely reaches here it seems; 1934 * usually the two edges belonging 1935 * to one stem are marked as DONE together 1936 */ 1937 has_last_stem = TRUE; 1938 last_stem_pos = edge->pos; 1939 continue; 1940 } 1941 1942 if ( dim != AF_DIMENSION_VERT && !anchor ) 1943 { 1944 1945 #if 0 1946 if ( fixedpitch ) 1947 { 1948 AF_Edge left = edge; 1949 AF_Edge right = edge_limit - 1; 1950 AF_EdgeRec left1, left2, right1, right2; 1951 FT_Pos target, center1, center2; 1952 FT_Pos delta1, delta2, d1, d2; 1953 1954 1955 while ( right > left && !right->link ) 1956 right--; 1957 1958 left1 = *left; 1959 left2 = *left->link; 1960 right1 = *right->link; 1961 right2 = *right; 1962 1963 delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2; 1964 target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16; 1965 1966 delta1 = delta; 1967 delta1 += af_hint_normal_stem( hints, left, left->link, 1968 delta1, 0 ); 1969 1970 if ( left->link != right ) 1971 af_hint_normal_stem( hints, right->link, right, delta1, 0 ); 1972 1973 center1 = left->pos + ( right->pos - left->pos ) / 2; 1974 1975 if ( center1 >= target ) 1976 delta2 = delta - 32; 1977 else 1978 delta2 = delta + 32; 1979 1980 delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 ); 1981 1982 if ( delta1 != delta2 ) 1983 { 1984 if ( left->link != right ) 1985 af_hint_normal_stem( hints, &right1, &right2, delta2, 0 ); 1986 1987 center2 = left1.pos + ( right2.pos - left1.pos ) / 2; 1988 1989 d1 = center1 - target; 1990 d2 = center2 - target; 1991 1992 if ( FT_ABS( d2 ) < FT_ABS( d1 ) ) 1993 { 1994 left->pos = left1.pos; 1995 left->link->pos = left2.pos; 1996 1997 if ( left->link != right ) 1998 { 1999 right->link->pos = right1.pos; 2000 right->pos = right2.pos; 2001 } 2002 2003 delta1 = delta2; 2004 } 2005 } 2006 2007 delta = delta1; 2008 right->link->flags |= AF_EDGE_DONE; 2009 right->flags |= AF_EDGE_DONE; 2010 } 2011 else 2012 2013 #endif /* 0 */ 2014 2015 delta = af_hint_normal_stem( hints, edge, edge2, 0, 2016 AF_DIMENSION_HORZ ); 2017 } 2018 else 2019 af_hint_normal_stem( hints, edge, edge2, delta, dim ); 2020 2021 #if 0 2022 printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n", 2023 edge - edges, edge2 - edges, 2024 (double)( edge->pos - edge->opos ) / 64, 2025 (double)( edge2->pos - edge2->opos ) / 64 ); 2026 #endif 2027 2028 anchor = edge; 2029 edge->flags |= AF_EDGE_DONE; 2030 edge2->flags |= AF_EDGE_DONE; 2031 has_last_stem = TRUE; 2032 last_stem_pos = edge2->pos; 2033 } 2034 2035 /* make sure that lowercase m's maintain their symmetry */ 2036 2037 /* In general, lowercase m's have six vertical edges if they are sans */ 2038 /* serif, or twelve if they are with serifs. This implementation is */ 2039 /* based on that assumption, and seems to work very well with most */ 2040 /* faces. However, if for a certain face this assumption is not */ 2041 /* true, the m is just rendered like before. In addition, any stem */ 2042 /* correction will only be applied to symmetrical glyphs (even if the */ 2043 /* glyph is not an m), so the potential for unwanted distortion is */ 2044 /* relatively low. */ 2045 2046 /* We don't handle horizontal edges since we can't easily assure that */ 2047 /* the third (lowest) stem aligns with the base line; it might end up */ 2048 /* one pixel higher or lower. */ 2049 2050 n_edges = edge_limit - edges; 2051 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 2052 { 2053 AF_Edge edge1, edge2, edge3; 2054 FT_Pos dist1, dist2, span; 2055 2056 2057 if ( n_edges == 6 ) 2058 { 2059 edge1 = edges; 2060 edge2 = edges + 2; 2061 edge3 = edges + 4; 2062 } 2063 else 2064 { 2065 edge1 = edges + 1; 2066 edge2 = edges + 5; 2067 edge3 = edges + 9; 2068 } 2069 2070 dist1 = edge2->opos - edge1->opos; 2071 dist2 = edge3->opos - edge2->opos; 2072 2073 span = dist1 - dist2; 2074 if ( span < 0 ) 2075 span = -span; 2076 2077 if ( edge1->link == edge1 + 1 && 2078 edge2->link == edge2 + 1 && 2079 edge3->link == edge3 + 1 && span < 8 ) 2080 { 2081 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2082 edge3->pos -= delta; 2083 if ( edge3->link ) 2084 edge3->link->pos -= delta; 2085 2086 /* move the serifs along with the stem */ 2087 if ( n_edges == 12 ) 2088 { 2089 ( edges + 8 )->pos -= delta; 2090 ( edges + 11 )->pos -= delta; 2091 } 2092 2093 edge3->flags |= AF_EDGE_DONE; 2094 if ( edge3->link ) 2095 edge3->link->flags |= AF_EDGE_DONE; 2096 } 2097 } 2098 2099 if ( !skipped ) 2100 goto Exit; 2101 2102 /* 2103 * now hint the remaining edges (serifs and single) in order 2104 * to complete our processing 2105 */ 2106 for ( edge = edges; edge < edge_limit; edge++ ) 2107 { 2108 if ( edge->flags & AF_EDGE_DONE ) 2109 continue; 2110 2111 if ( edge->serif ) 2112 { 2113 af_cjk_align_serif_edge( hints, edge->serif, edge ); 2114 edge->flags |= AF_EDGE_DONE; 2115 skipped--; 2116 } 2117 } 2118 2119 if ( !skipped ) 2120 goto Exit; 2121 2122 for ( edge = edges; edge < edge_limit; edge++ ) 2123 { 2124 AF_Edge before, after; 2125 2126 2127 if ( edge->flags & AF_EDGE_DONE ) 2128 continue; 2129 2130 before = after = edge; 2131 2132 while ( --before >= edges ) 2133 if ( before->flags & AF_EDGE_DONE ) 2134 break; 2135 2136 while ( ++after < edge_limit ) 2137 if ( after->flags & AF_EDGE_DONE ) 2138 break; 2139 2140 if ( before >= edges || after < edge_limit ) 2141 { 2142 if ( before < edges ) 2143 af_cjk_align_serif_edge( hints, after, edge ); 2144 else if ( after >= edge_limit ) 2145 af_cjk_align_serif_edge( hints, before, edge ); 2146 else 2147 { 2148 if ( after->fpos == before->fpos ) 2149 edge->pos = before->pos; 2150 else 2151 edge->pos = before->pos + 2152 FT_MulDiv( edge->fpos - before->fpos, 2153 after->pos - before->pos, 2154 after->fpos - before->fpos ); 2155 } 2156 } 2157 } 2158 2159 Exit: 2160 2161 #ifdef FT_DEBUG_LEVEL_TRACE 2162 if ( !num_actions ) 2163 FT_TRACE5(( " (none)\n" )); 2164 FT_TRACE5(( "\n" )); 2165 #endif 2166 2167 return; 2168 } 2169 2170 2171 static void 2172 af_cjk_align_edge_points( AF_GlyphHints hints, 2173 AF_Dimension dim ) 2174 { 2175 AF_AxisHints axis = &hints->axis[dim]; 2176 AF_Edge edges = axis->edges; 2177 AF_Edge edge_limit = FT_OFFSET( edges, axis->num_edges ); 2178 AF_Edge edge; 2179 FT_Bool snapping; 2180 2181 2182 snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ && 2183 AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) || 2184 ( dim == AF_DIMENSION_VERT && 2185 AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ); 2186 2187 for ( edge = edges; edge < edge_limit; edge++ ) 2188 { 2189 /* move the points of each segment */ 2190 /* in each edge to the edge's position */ 2191 AF_Segment seg = edge->first; 2192 2193 2194 if ( snapping ) 2195 { 2196 do 2197 { 2198 AF_Point point = seg->first; 2199 2200 2201 for (;;) 2202 { 2203 if ( dim == AF_DIMENSION_HORZ ) 2204 { 2205 point->x = edge->pos; 2206 point->flags |= AF_FLAG_TOUCH_X; 2207 } 2208 else 2209 { 2210 point->y = edge->pos; 2211 point->flags |= AF_FLAG_TOUCH_Y; 2212 } 2213 2214 if ( point == seg->last ) 2215 break; 2216 2217 point = point->next; 2218 } 2219 2220 seg = seg->edge_next; 2221 2222 } while ( seg != edge->first ); 2223 } 2224 else 2225 { 2226 FT_Pos delta = edge->pos - edge->opos; 2227 2228 2229 do 2230 { 2231 AF_Point point = seg->first; 2232 2233 2234 for (;;) 2235 { 2236 if ( dim == AF_DIMENSION_HORZ ) 2237 { 2238 point->x += delta; 2239 point->flags |= AF_FLAG_TOUCH_X; 2240 } 2241 else 2242 { 2243 point->y += delta; 2244 point->flags |= AF_FLAG_TOUCH_Y; 2245 } 2246 2247 if ( point == seg->last ) 2248 break; 2249 2250 point = point->next; 2251 } 2252 2253 seg = seg->edge_next; 2254 2255 } while ( seg != edge->first ); 2256 } 2257 } 2258 } 2259 2260 2261 /* Apply the complete hinting algorithm to a CJK glyph. */ 2262 2263 FT_LOCAL_DEF( FT_Error ) 2264 af_cjk_hints_apply( FT_UInt glyph_index, 2265 AF_GlyphHints hints, 2266 FT_Outline* outline, 2267 AF_StyleMetrics metrics_ ) /* AF_CJKMetrics */ 2268 { 2269 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_; 2270 2271 FT_Error error; 2272 int dim; 2273 2274 FT_UNUSED( metrics ); 2275 FT_UNUSED( glyph_index ); 2276 2277 2278 error = af_glyph_hints_reload( hints, outline ); 2279 if ( error ) 2280 goto Exit; 2281 2282 /* analyze glyph outline */ 2283 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2284 { 2285 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2286 if ( error ) 2287 goto Exit; 2288 2289 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_HORZ ); 2290 } 2291 2292 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2293 { 2294 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT ); 2295 if ( error ) 2296 goto Exit; 2297 2298 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_VERT ); 2299 } 2300 2301 /* grid-fit the outline */ 2302 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2303 { 2304 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2305 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2306 { 2307 af_cjk_hint_edges( hints, (AF_Dimension)dim ); 2308 af_cjk_align_edge_points( hints, (AF_Dimension)dim ); 2309 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2310 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2311 } 2312 } 2313 2314 af_glyph_hints_save( hints, outline ); 2315 2316 Exit: 2317 return error; 2318 } 2319 2320 2321 /*************************************************************************/ 2322 /*************************************************************************/ 2323 /***** *****/ 2324 /***** C J K S C R I P T C L A S S *****/ 2325 /***** *****/ 2326 /*************************************************************************/ 2327 /*************************************************************************/ 2328 2329 2330 AF_DEFINE_WRITING_SYSTEM_CLASS( 2331 af_cjk_writing_system_class, 2332 2333 AF_WRITING_SYSTEM_CJK, 2334 2335 sizeof ( AF_CJKMetricsRec ), 2336 2337 (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init, /* style_metrics_init */ 2338 (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale, /* style_metrics_scale */ 2339 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */ 2340 (AF_WritingSystem_GetStdWidthsFunc)af_cjk_get_standard_widths, /* style_metrics_getstdw */ 2341 2342 (AF_WritingSystem_InitHintsFunc) af_cjk_hints_init, /* style_hints_init */ 2343 (AF_WritingSystem_ApplyHintsFunc) af_cjk_hints_apply /* style_hints_apply */ 2344 ) 2345 2346 2347 #else /* !AF_CONFIG_OPTION_CJK */ 2348 2349 2350 AF_DEFINE_WRITING_SYSTEM_CLASS( 2351 af_cjk_writing_system_class, 2352 2353 AF_WRITING_SYSTEM_CJK, 2354 2355 sizeof ( AF_CJKMetricsRec ), 2356 2357 (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init */ 2358 (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale */ 2359 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */ 2360 (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */ 2361 2362 (AF_WritingSystem_InitHintsFunc) NULL, /* style_hints_init */ 2363 (AF_WritingSystem_ApplyHintsFunc) NULL /* style_hints_apply */ 2364 ) 2365 2366 2367 #endif /* !AF_CONFIG_OPTION_CJK */ 2368 2369 2370 /* END */