1 /**************************************************************************** 2 * 3 * afcjk.c 4 * 5 * Auto-fitter hinting routines for CJK writing system (body). 6 * 7 * Copyright (C) 2006-2019 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 <ft2build.h> 26 #include FT_ADVANCES_H 27 #include FT_INTERNAL_DEBUG_H 28 29 #include "afglobal.h" 30 #include "aflatin.h" 31 #include "afcjk.h" 32 33 34 #ifdef AF_CONFIG_OPTION_CJK 35 36 #undef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT 37 38 #include "aferrors.h" 39 40 41 #ifdef AF_CONFIG_OPTION_USE_WARPER 42 #include "afwarp.h" 43 #endif 44 45 46 /************************************************************************** 47 * 48 * The macro FT_COMPONENT is used in trace mode. It is an implicit 49 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log 50 * messages during execution. 51 */ 52 #undef FT_COMPONENT 53 #define FT_COMPONENT afcjk 54 55 56 /*************************************************************************/ 57 /*************************************************************************/ 58 /***** *****/ 59 /***** C J K G L O B A L M E T R I C S *****/ 60 /***** *****/ 61 /*************************************************************************/ 62 /*************************************************************************/ 63 64 65 /* Basically the Latin version with AF_CJKMetrics */ 66 /* to replace AF_LatinMetrics. */ 67 68 FT_LOCAL_DEF( void ) 69 af_cjk_metrics_init_widths( AF_CJKMetrics metrics, 70 FT_Face face ) 71 { 72 /* scan the array of segments in each direction */ 73 AF_GlyphHintsRec hints[1]; 74 75 76 FT_TRACE5(( "\n" 77 "cjk standard widths computation (style `%s')\n" 78 "===================================================\n" 79 "\n", 80 af_style_names[metrics->root.style_class->style] )); 81 82 af_glyph_hints_init( hints, face->memory ); 83 84 metrics->axis[AF_DIMENSION_HORZ].width_count = 0; 85 metrics->axis[AF_DIMENSION_VERT].width_count = 0; 86 87 { 88 FT_Error error; 89 FT_ULong glyph_index; 90 int dim; 91 AF_CJKMetricsRec dummy[1]; 92 AF_Scaler scaler = &dummy->root.scaler; 93 94 AF_StyleClass style_class = metrics->root.style_class; 95 AF_ScriptClass script_class = af_script_classes[style_class->script]; 96 97 /* If HarfBuzz is not available, we need a pointer to a single */ 98 /* unsigned long value. */ 99 #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ 100 void* shaper_buf; 101 #else 102 FT_ULong shaper_buf_; 103 void* shaper_buf = &shaper_buf_; 104 #endif 105 106 const char* p; 107 108 #ifdef FT_DEBUG_LEVEL_TRACE 109 FT_ULong ch = 0; 110 #endif 111 112 p = script_class->standard_charstring; 113 114 #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ 115 shaper_buf = af_shaper_buf_create( face ); 116 #endif 117 118 /* We check a list of standard characters. The first match wins. */ 119 120 glyph_index = 0; 121 while ( *p ) 122 { 123 unsigned int num_idx; 124 125 #ifdef FT_DEBUG_LEVEL_TRACE 126 const char* p_old; 127 #endif 128 129 130 while ( *p == ' ' ) 131 p++; 132 133 #ifdef FT_DEBUG_LEVEL_TRACE 134 p_old = p; 135 GET_UTF8_CHAR( ch, p_old ); 136 #endif 137 138 /* reject input that maps to more than a single glyph */ 139 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx ); 140 if ( num_idx > 1 ) 141 continue; 142 143 /* otherwise exit loop if we have a result */ 144 glyph_index = af_shaper_get_elem( &metrics->root, 145 shaper_buf, 146 0, 147 NULL, 148 NULL ); 149 if ( glyph_index ) 150 break; 151 } 152 153 af_shaper_buf_destroy( face, shaper_buf ); 154 155 if ( !glyph_index ) 156 goto Exit; 157 158 if ( !glyph_index ) 159 goto Exit; 160 161 FT_TRACE5(( "standard character: U+%04lX (glyph index %d)\n", 162 ch, glyph_index )); 163 164 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 165 if ( error || face->glyph->outline.n_points <= 0 ) 166 goto Exit; 167 168 FT_ZERO( dummy ); 169 170 dummy->units_per_em = metrics->units_per_em; 171 172 scaler->x_scale = 0x10000L; 173 scaler->y_scale = 0x10000L; 174 scaler->x_delta = 0; 175 scaler->y_delta = 0; 176 177 scaler->face = face; 178 scaler->render_mode = FT_RENDER_MODE_NORMAL; 179 scaler->flags = 0; 180 181 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy ); 182 183 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 184 if ( error ) 185 goto Exit; 186 187 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 188 { 189 AF_CJKAxis axis = &metrics->axis[dim]; 190 AF_AxisHints axhints = &hints->axis[dim]; 191 AF_Segment seg, limit, link; 192 FT_UInt num_widths = 0; 193 194 195 error = af_latin_hints_compute_segments( hints, 196 (AF_Dimension)dim ); 197 if ( error ) 198 goto Exit; 199 200 /* 201 * We assume that the glyphs selected for the stem width 202 * computation are `featureless' enough so that the linking 203 * algorithm works fine without adjustments of its scoring 204 * function. 205 */ 206 af_latin_hints_link_segments( hints, 207 0, 208 NULL, 209 (AF_Dimension)dim ); 210 211 seg = axhints->segments; 212 limit = seg + axhints->num_segments; 213 214 for ( ; seg < limit; seg++ ) 215 { 216 link = seg->link; 217 218 /* we only consider stem segments there! */ 219 if ( link && link->link == seg && link > seg ) 220 { 221 FT_Pos dist; 222 223 224 dist = seg->pos - link->pos; 225 if ( dist < 0 ) 226 dist = -dist; 227 228 if ( num_widths < AF_CJK_MAX_WIDTHS ) 229 axis->widths[num_widths++].org = dist; 230 } 231 } 232 233 /* this also replaces multiple almost identical stem widths */ 234 /* with a single one (the value 100 is heuristic) */ 235 af_sort_and_quantize_widths( &num_widths, axis->widths, 236 dummy->units_per_em / 100 ); 237 axis->width_count = num_widths; 238 } 239 240 Exit: 241 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 242 { 243 AF_CJKAxis axis = &metrics->axis[dim]; 244 FT_Pos stdw; 245 246 247 stdw = ( axis->width_count > 0 ) ? axis->widths[0].org 248 : AF_LATIN_CONSTANT( metrics, 50 ); 249 250 /* let's try 20% of the smallest width */ 251 axis->edge_distance_threshold = stdw / 5; 252 axis->standard_width = stdw; 253 axis->extra_light = 0; 254 255 #ifdef FT_DEBUG_LEVEL_TRACE 256 { 257 FT_UInt i; 258 259 260 FT_TRACE5(( "%s widths:\n", 261 dim == AF_DIMENSION_VERT ? "horizontal" 262 : "vertical" )); 263 264 FT_TRACE5(( " %d (standard)", axis->standard_width )); 265 for ( i = 1; i < axis->width_count; i++ ) 266 FT_TRACE5(( " %d", axis->widths[i].org )); 267 268 FT_TRACE5(( "\n" )); 269 } 270 #endif 271 } 272 } 273 274 FT_TRACE5(( "\n" )); 275 276 af_glyph_hints_done( hints ); 277 } 278 279 280 /* Find all blue zones. */ 281 282 static void 283 af_cjk_metrics_init_blues( AF_CJKMetrics metrics, 284 FT_Face face ) 285 { 286 FT_Pos fills[AF_BLUE_STRING_MAX_LEN]; 287 FT_Pos flats[AF_BLUE_STRING_MAX_LEN]; 288 289 FT_UInt num_fills; 290 FT_UInt num_flats; 291 292 FT_Bool fill; 293 294 AF_CJKBlue blue; 295 FT_Error error; 296 AF_CJKAxis axis; 297 FT_Outline outline; 298 299 AF_StyleClass sc = metrics->root.style_class; 300 301 AF_Blue_Stringset bss = sc->blue_stringset; 302 const AF_Blue_StringRec* bs = &af_blue_stringsets[bss]; 303 304 /* If HarfBuzz is not available, we need a pointer to a single */ 305 /* unsigned long value. */ 306 #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ 307 void* shaper_buf; 308 #else 309 FT_ULong shaper_buf_; 310 void* shaper_buf = &shaper_buf_; 311 #endif 312 313 314 /* we walk over the blue character strings as specified in the */ 315 /* style's entry in the `af_blue_stringset' array, computing its */ 316 /* extremum points (depending on the string properties) */ 317 318 FT_TRACE5(( "cjk blue zones computation\n" 319 "==========================\n" 320 "\n" )); 321 322 #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ 323 shaper_buf = af_shaper_buf_create( face ); 324 #endif 325 326 for ( ; bs->string != AF_BLUE_STRING_MAX; bs++ ) 327 { 328 const char* p = &af_blue_strings[bs->string]; 329 FT_Pos* blue_ref; 330 FT_Pos* blue_shoot; 331 332 333 if ( AF_CJK_IS_HORIZ_BLUE( bs ) ) 334 axis = &metrics->axis[AF_DIMENSION_HORZ]; 335 else 336 axis = &metrics->axis[AF_DIMENSION_VERT]; 337 338 #ifdef FT_DEBUG_LEVEL_TRACE 339 { 340 FT_String* cjk_blue_name[4] = 341 { 342 (FT_String*)"bottom", /* -- , -- */ 343 (FT_String*)"top", /* -- , TOP */ 344 (FT_String*)"left", /* HORIZ, -- */ 345 (FT_String*)"right" /* HORIZ, TOP */ 346 }; 347 348 349 FT_TRACE5(( "blue zone %d (%s):\n", 350 axis->blue_count, 351 cjk_blue_name[AF_CJK_IS_HORIZ_BLUE( bs ) | 352 AF_CJK_IS_TOP_BLUE( bs ) ] )); 353 } 354 #endif /* FT_DEBUG_LEVEL_TRACE */ 355 356 num_fills = 0; 357 num_flats = 0; 358 359 fill = 1; /* start with characters that define fill values */ 360 FT_TRACE5(( " [overshoot values]\n" )); 361 362 while ( *p ) 363 { 364 FT_ULong glyph_index; 365 FT_Pos best_pos; /* same as points.y or points.x, resp. */ 366 FT_Int best_point; 367 FT_Vector* points; 368 369 unsigned int num_idx; 370 371 #ifdef FT_DEBUG_LEVEL_TRACE 372 const char* p_old; 373 FT_ULong ch; 374 #endif 375 376 377 while ( *p == ' ' ) 378 p++; 379 380 #ifdef FT_DEBUG_LEVEL_TRACE 381 p_old = p; 382 GET_UTF8_CHAR( ch, p_old ); 383 #endif 384 385 /* switch to characters that define flat values */ 386 if ( *p == '|' ) 387 { 388 fill = 0; 389 FT_TRACE5(( " [reference values]\n" )); 390 p++; 391 continue; 392 } 393 394 /* reject input that maps to more than a single glyph */ 395 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx ); 396 if ( num_idx > 1 ) 397 continue; 398 399 /* load the character in the face -- skip unknown or empty ones */ 400 glyph_index = af_shaper_get_elem( &metrics->root, 401 shaper_buf, 402 0, 403 NULL, 404 NULL ); 405 if ( glyph_index == 0 ) 406 { 407 FT_TRACE5(( " U+%04lX unavailable\n", ch )); 408 continue; 409 } 410 411 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 412 outline = face->glyph->outline; 413 if ( error || outline.n_points <= 2 ) 414 { 415 FT_TRACE5(( " U+%04lX contains no (usable) outlines\n", ch )); 416 continue; 417 } 418 419 /* now compute min or max point indices and coordinates */ 420 points = outline.points; 421 best_point = -1; 422 best_pos = 0; /* make compiler happy */ 423 424 { 425 FT_Int nn; 426 FT_Int first = 0; 427 FT_Int last = -1; 428 429 430 for ( nn = 0; nn < outline.n_contours; first = last + 1, nn++ ) 431 { 432 FT_Int pp; 433 434 435 last = outline.contours[nn]; 436 437 /* Avoid single-point contours since they are never rasterized. */ 438 /* In some fonts, they correspond to mark attachment points */ 439 /* which are way outside of the glyph's real outline. */ 440 if ( last <= first ) 441 continue; 442 443 if ( AF_CJK_IS_HORIZ_BLUE( bs ) ) 444 { 445 if ( AF_CJK_IS_RIGHT_BLUE( bs ) ) 446 { 447 for ( pp = first; pp <= last; pp++ ) 448 if ( best_point < 0 || points[pp].x > best_pos ) 449 { 450 best_point = pp; 451 best_pos = points[pp].x; 452 } 453 } 454 else 455 { 456 for ( pp = first; pp <= last; pp++ ) 457 if ( best_point < 0 || points[pp].x < best_pos ) 458 { 459 best_point = pp; 460 best_pos = points[pp].x; 461 } 462 } 463 } 464 else 465 { 466 if ( AF_CJK_IS_TOP_BLUE( bs ) ) 467 { 468 for ( pp = first; pp <= last; pp++ ) 469 if ( best_point < 0 || points[pp].y > best_pos ) 470 { 471 best_point = pp; 472 best_pos = points[pp].y; 473 } 474 } 475 else 476 { 477 for ( pp = first; pp <= last; pp++ ) 478 if ( best_point < 0 || points[pp].y < best_pos ) 479 { 480 best_point = pp; 481 best_pos = points[pp].y; 482 } 483 } 484 } 485 } 486 487 FT_TRACE5(( " U+%04lX: best_pos = %5ld\n", ch, best_pos )); 488 } 489 490 if ( fill ) 491 fills[num_fills++] = best_pos; 492 else 493 flats[num_flats++] = best_pos; 494 495 } /* end while loop */ 496 497 if ( num_flats == 0 && num_fills == 0 ) 498 { 499 /* 500 * we couldn't find a single glyph to compute this blue zone, 501 * we will simply ignore it then 502 */ 503 FT_TRACE5(( " empty\n" )); 504 continue; 505 } 506 507 /* we have computed the contents of the `fill' and `flats' tables, */ 508 /* now determine the reference and overshoot position of the blue -- */ 509 /* we simply take the median value after a simple sort */ 510 af_sort_pos( num_fills, fills ); 511 af_sort_pos( num_flats, flats ); 512 513 blue = &axis->blues[axis->blue_count]; 514 blue_ref = &blue->ref.org; 515 blue_shoot = &blue->shoot.org; 516 517 axis->blue_count++; 518 519 if ( num_flats == 0 ) 520 { 521 *blue_ref = 522 *blue_shoot = fills[num_fills / 2]; 523 } 524 else if ( num_fills == 0 ) 525 { 526 *blue_ref = 527 *blue_shoot = flats[num_flats / 2]; 528 } 529 else 530 { 531 *blue_ref = fills[num_fills / 2]; 532 *blue_shoot = flats[num_flats / 2]; 533 } 534 535 /* make sure blue_ref >= blue_shoot for top/right or */ 536 /* vice versa for bottom/left */ 537 if ( *blue_shoot != *blue_ref ) 538 { 539 FT_Pos ref = *blue_ref; 540 FT_Pos shoot = *blue_shoot; 541 FT_Bool under_ref = FT_BOOL( shoot < ref ); 542 543 544 /* AF_CJK_IS_TOP_BLUE covers `right' and `top' */ 545 if ( AF_CJK_IS_TOP_BLUE( bs ) ^ under_ref ) 546 { 547 *blue_ref = 548 *blue_shoot = ( shoot + ref ) / 2; 549 550 FT_TRACE5(( " [reference smaller than overshoot," 551 " taking mean value]\n" )); 552 } 553 } 554 555 blue->flags = 0; 556 if ( AF_CJK_IS_TOP_BLUE( bs ) ) 557 blue->flags |= AF_CJK_BLUE_TOP; 558 559 FT_TRACE5(( " -> reference = %ld\n" 560 " overshoot = %ld\n", 561 *blue_ref, *blue_shoot )); 562 563 } /* end for loop */ 564 565 af_shaper_buf_destroy( face, shaper_buf ); 566 567 FT_TRACE5(( "\n" )); 568 569 return; 570 } 571 572 573 /* Basically the Latin version with type AF_CJKMetrics for metrics. */ 574 575 FT_LOCAL_DEF( void ) 576 af_cjk_metrics_check_digits( AF_CJKMetrics metrics, 577 FT_Face face ) 578 { 579 FT_Bool started = 0, same_width = 1; 580 FT_Fixed advance = 0, old_advance = 0; 581 582 /* If HarfBuzz is not available, we need a pointer to a single */ 583 /* unsigned long value. */ 584 #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ 585 void* shaper_buf; 586 #else 587 FT_ULong shaper_buf_; 588 void* shaper_buf = &shaper_buf_; 589 #endif 590 591 /* in all supported charmaps, digits have character codes 0x30-0x39 */ 592 const char digits[] = "0 1 2 3 4 5 6 7 8 9"; 593 const char* p; 594 595 596 p = digits; 597 598 #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ 599 shaper_buf = af_shaper_buf_create( face ); 600 #endif 601 602 while ( *p ) 603 { 604 FT_ULong glyph_index; 605 unsigned int num_idx; 606 607 608 /* reject input that maps to more than a single glyph */ 609 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx ); 610 if ( num_idx > 1 ) 611 continue; 612 613 glyph_index = af_shaper_get_elem( &metrics->root, 614 shaper_buf, 615 0, 616 &advance, 617 NULL ); 618 if ( !glyph_index ) 619 continue; 620 621 if ( started ) 622 { 623 if ( advance != old_advance ) 624 { 625 same_width = 0; 626 break; 627 } 628 } 629 else 630 { 631 old_advance = advance; 632 started = 1; 633 } 634 } 635 636 af_shaper_buf_destroy( face, shaper_buf ); 637 638 metrics->root.digits_have_same_width = same_width; 639 } 640 641 642 /* Initialize global metrics. */ 643 644 FT_LOCAL_DEF( FT_Error ) 645 af_cjk_metrics_init( AF_CJKMetrics metrics, 646 FT_Face face ) 647 { 648 FT_CharMap oldmap = face->charmap; 649 650 651 metrics->units_per_em = face->units_per_EM; 652 653 if ( !FT_Select_Charmap( face, FT_ENCODING_UNICODE ) ) 654 { 655 af_cjk_metrics_init_widths( metrics, face ); 656 af_cjk_metrics_init_blues( metrics, face ); 657 af_cjk_metrics_check_digits( metrics, face ); 658 } 659 660 FT_Set_Charmap( face, oldmap ); 661 return FT_Err_Ok; 662 } 663 664 665 /* Adjust scaling value, then scale and shift widths */ 666 /* and blue zones (if applicable) for given dimension. */ 667 668 static void 669 af_cjk_metrics_scale_dim( AF_CJKMetrics metrics, 670 AF_Scaler scaler, 671 AF_Dimension dim ) 672 { 673 FT_Fixed scale; 674 FT_Pos delta; 675 AF_CJKAxis axis; 676 FT_UInt nn; 677 678 679 if ( dim == AF_DIMENSION_HORZ ) 680 { 681 scale = scaler->x_scale; 682 delta = scaler->x_delta; 683 } 684 else 685 { 686 scale = scaler->y_scale; 687 delta = scaler->y_delta; 688 } 689 690 axis = &metrics->axis[dim]; 691 692 if ( axis->org_scale == scale && axis->org_delta == delta ) 693 return; 694 695 axis->org_scale = scale; 696 axis->org_delta = delta; 697 698 axis->scale = scale; 699 axis->delta = delta; 700 701 /* scale the blue zones */ 702 for ( nn = 0; nn < axis->blue_count; nn++ ) 703 { 704 AF_CJKBlue blue = &axis->blues[nn]; 705 FT_Pos dist; 706 707 708 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 709 blue->ref.fit = blue->ref.cur; 710 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 711 blue->shoot.fit = blue->shoot.cur; 712 blue->flags &= ~AF_CJK_BLUE_ACTIVE; 713 714 /* a blue zone is only active if it is less than 3/4 pixels tall */ 715 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 716 if ( dist <= 48 && dist >= -48 ) 717 { 718 FT_Pos delta1, delta2; 719 720 721 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 722 723 /* shoot is under shoot for cjk */ 724 delta1 = FT_DivFix( blue->ref.fit, scale ) - blue->shoot.org; 725 delta2 = delta1; 726 if ( delta1 < 0 ) 727 delta2 = -delta2; 728 729 delta2 = FT_MulFix( delta2, scale ); 730 731 FT_TRACE5(( "delta: %d", delta1 )); 732 if ( delta2 < 32 ) 733 delta2 = 0; 734 #if 0 735 else if ( delta2 < 64 ) 736 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 737 #endif 738 else 739 delta2 = FT_PIX_ROUND( delta2 ); 740 FT_TRACE5(( "/%d\n", delta2 )); 741 742 if ( delta1 < 0 ) 743 delta2 = -delta2; 744 745 blue->shoot.fit = blue->ref.fit - delta2; 746 747 FT_TRACE5(( ">> active cjk blue zone %c%d[%ld/%ld]:\n" 748 " ref: cur=%.2f fit=%.2f\n" 749 " shoot: cur=%.2f fit=%.2f\n", 750 ( dim == AF_DIMENSION_HORZ ) ? 'H' : 'V', 751 nn, blue->ref.org, blue->shoot.org, 752 blue->ref.cur / 64.0, blue->ref.fit / 64.0, 753 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 )); 754 755 blue->flags |= AF_CJK_BLUE_ACTIVE; 756 } 757 } 758 } 759 760 761 /* Scale global values in both directions. */ 762 763 FT_LOCAL_DEF( void ) 764 af_cjk_metrics_scale( AF_CJKMetrics metrics, 765 AF_Scaler scaler ) 766 { 767 /* we copy the whole structure since the x and y scaling values */ 768 /* are not modified, contrary to e.g. the `latin' auto-hinter */ 769 metrics->root.scaler = *scaler; 770 771 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 772 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 773 } 774 775 776 /* Extract standard_width from writing system/script specific */ 777 /* metrics class. */ 778 779 FT_LOCAL_DEF( void ) 780 af_cjk_get_standard_widths( AF_CJKMetrics metrics, 781 FT_Pos* stdHW, 782 FT_Pos* stdVW ) 783 { 784 if ( stdHW ) 785 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width; 786 787 if ( stdVW ) 788 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width; 789 } 790 791 792 /*************************************************************************/ 793 /*************************************************************************/ 794 /***** *****/ 795 /***** C J K G L Y P H A N A L Y S I S *****/ 796 /***** *****/ 797 /*************************************************************************/ 798 /*************************************************************************/ 799 800 801 /* Walk over all contours and compute its segments. */ 802 803 static FT_Error 804 af_cjk_hints_compute_segments( AF_GlyphHints hints, 805 AF_Dimension dim ) 806 { 807 AF_AxisHints axis = &hints->axis[dim]; 808 AF_Segment segments = axis->segments; 809 AF_Segment segment_limit = segments + axis->num_segments; 810 FT_Error error; 811 AF_Segment seg; 812 813 814 error = af_latin_hints_compute_segments( hints, dim ); 815 if ( error ) 816 return error; 817 818 /* a segment is round if it doesn't have successive */ 819 /* on-curve points. */ 820 for ( seg = segments; seg < segment_limit; seg++ ) 821 { 822 AF_Point pt = seg->first; 823 AF_Point last = seg->last; 824 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL; 825 FT_UInt f1; 826 827 828 seg->flags &= ~AF_EDGE_ROUND; 829 830 for ( ; pt != last; f0 = f1 ) 831 { 832 pt = pt->next; 833 f1 = pt->flags & AF_FLAG_CONTROL; 834 835 if ( !f0 && !f1 ) 836 break; 837 838 if ( pt == last ) 839 seg->flags |= AF_EDGE_ROUND; 840 } 841 } 842 843 return FT_Err_Ok; 844 } 845 846 847 static void 848 af_cjk_hints_link_segments( AF_GlyphHints hints, 849 AF_Dimension dim ) 850 { 851 AF_AxisHints axis = &hints->axis[dim]; 852 AF_Segment segments = axis->segments; 853 AF_Segment segment_limit = segments + axis->num_segments; 854 AF_Direction major_dir = axis->major_dir; 855 AF_Segment seg1, seg2; 856 FT_Pos len_threshold; 857 FT_Pos dist_threshold; 858 859 860 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 861 862 dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 863 : hints->y_scale; 864 dist_threshold = FT_DivFix( 64 * 3, dist_threshold ); 865 866 /* now compare each segment to the others */ 867 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 868 { 869 if ( seg1->dir != major_dir ) 870 continue; 871 872 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 873 if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 ) 874 { 875 FT_Pos dist = seg2->pos - seg1->pos; 876 877 878 if ( dist < 0 ) 879 continue; 880 881 { 882 FT_Pos min = seg1->min_coord; 883 FT_Pos max = seg1->max_coord; 884 FT_Pos len; 885 886 887 if ( min < seg2->min_coord ) 888 min = seg2->min_coord; 889 890 if ( max > seg2->max_coord ) 891 max = seg2->max_coord; 892 893 len = max - min; 894 if ( len >= len_threshold ) 895 { 896 if ( dist * 8 < seg1->score * 9 && 897 ( dist * 8 < seg1->score * 7 || seg1->len < len ) ) 898 { 899 seg1->score = dist; 900 seg1->len = len; 901 seg1->link = seg2; 902 } 903 904 if ( dist * 8 < seg2->score * 9 && 905 ( dist * 8 < seg2->score * 7 || seg2->len < len ) ) 906 { 907 seg2->score = dist; 908 seg2->len = len; 909 seg2->link = seg1; 910 } 911 } 912 } 913 } 914 } 915 916 /* 917 * now compute the `serif' segments 918 * 919 * In Hanzi, some strokes are wider on one or both of the ends. 920 * We either identify the stems on the ends as serifs or remove 921 * the linkage, depending on the length of the stems. 922 * 923 */ 924 925 { 926 AF_Segment link1, link2; 927 928 929 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 930 { 931 link1 = seg1->link; 932 if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos ) 933 continue; 934 935 if ( seg1->score >= dist_threshold ) 936 continue; 937 938 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 939 { 940 if ( seg2->pos > seg1->pos || seg1 == seg2 ) 941 continue; 942 943 link2 = seg2->link; 944 if ( !link2 || link2->link != seg2 || link2->pos < link1->pos ) 945 continue; 946 947 if ( seg1->pos == seg2->pos && link1->pos == link2->pos ) 948 continue; 949 950 if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score ) 951 continue; 952 953 /* seg2 < seg1 < link1 < link2 */ 954 955 if ( seg1->len >= seg2->len * 3 ) 956 { 957 AF_Segment seg; 958 959 960 for ( seg = segments; seg < segment_limit; seg++ ) 961 { 962 AF_Segment link = seg->link; 963 964 965 if ( link == seg2 ) 966 { 967 seg->link = NULL; 968 seg->serif = link1; 969 } 970 else if ( link == link2 ) 971 { 972 seg->link = NULL; 973 seg->serif = seg1; 974 } 975 } 976 } 977 else 978 { 979 seg1->link = link1->link = NULL; 980 981 break; 982 } 983 } 984 } 985 } 986 987 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 988 { 989 seg2 = seg1->link; 990 991 if ( seg2 ) 992 { 993 if ( seg2->link != seg1 ) 994 { 995 seg1->link = NULL; 996 997 if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 ) 998 seg1->serif = seg2->link; 999 } 1000 } 1001 } 1002 } 1003 1004 1005 static FT_Error 1006 af_cjk_hints_compute_edges( AF_GlyphHints hints, 1007 AF_Dimension dim ) 1008 { 1009 AF_AxisHints axis = &hints->axis[dim]; 1010 FT_Error error = FT_Err_Ok; 1011 FT_Memory memory = hints->memory; 1012 AF_CJKAxis laxis = &((AF_CJKMetrics)hints->metrics)->axis[dim]; 1013 1014 AF_Segment segments = axis->segments; 1015 AF_Segment segment_limit = segments + axis->num_segments; 1016 AF_Segment seg; 1017 1018 FT_Fixed scale; 1019 FT_Pos edge_distance_threshold; 1020 1021 1022 axis->num_edges = 0; 1023 1024 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 1025 : hints->y_scale; 1026 1027 /********************************************************************** 1028 * 1029 * We begin by generating a sorted table of edges for the current 1030 * direction. To do so, we simply scan each segment and try to find 1031 * an edge in our table that corresponds to its position. 1032 * 1033 * If no edge is found, we create and insert a new edge in the 1034 * sorted table. Otherwise, we simply add the segment to the edge's 1035 * list which is then processed in the second step to compute the 1036 * edge's properties. 1037 * 1038 * Note that the edges table is sorted along the segment/edge 1039 * position. 1040 * 1041 */ 1042 1043 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1044 scale ); 1045 if ( edge_distance_threshold > 64 / 4 ) 1046 edge_distance_threshold = FT_DivFix( 64 / 4, scale ); 1047 else 1048 edge_distance_threshold = laxis->edge_distance_threshold; 1049 1050 for ( seg = segments; seg < segment_limit; seg++ ) 1051 { 1052 AF_Edge found = NULL; 1053 FT_Pos best = 0xFFFFU; 1054 FT_Int ee; 1055 1056 1057 /* look for an edge corresponding to the segment */ 1058 for ( ee = 0; ee < axis->num_edges; ee++ ) 1059 { 1060 AF_Edge edge = axis->edges + ee; 1061 FT_Pos dist; 1062 1063 1064 if ( edge->dir != seg->dir ) 1065 continue; 1066 1067 dist = seg->pos - edge->fpos; 1068 if ( dist < 0 ) 1069 dist = -dist; 1070 1071 if ( dist < edge_distance_threshold && dist < best ) 1072 { 1073 AF_Segment link = seg->link; 1074 1075 1076 /* check whether all linked segments of the candidate edge */ 1077 /* can make a single edge. */ 1078 if ( link ) 1079 { 1080 AF_Segment seg1 = edge->first; 1081 FT_Pos dist2 = 0; 1082 1083 1084 do 1085 { 1086 AF_Segment link1 = seg1->link; 1087 1088 1089 if ( link1 ) 1090 { 1091 dist2 = AF_SEGMENT_DIST( link, link1 ); 1092 if ( dist2 >= edge_distance_threshold ) 1093 break; 1094 } 1095 1096 } while ( ( seg1 = seg1->edge_next ) != edge->first ); 1097 1098 if ( dist2 >= edge_distance_threshold ) 1099 continue; 1100 } 1101 1102 best = dist; 1103 found = edge; 1104 } 1105 } 1106 1107 if ( !found ) 1108 { 1109 AF_Edge edge; 1110 1111 1112 /* insert a new edge in the list and */ 1113 /* sort according to the position */ 1114 error = af_axis_hints_new_edge( axis, seg->pos, 1115 (AF_Direction)seg->dir, 0, 1116 memory, &edge ); 1117 if ( error ) 1118 goto Exit; 1119 1120 /* add the segment to the new edge's list */ 1121 FT_ZERO( edge ); 1122 1123 edge->first = seg; 1124 edge->last = seg; 1125 edge->dir = seg->dir; 1126 edge->fpos = seg->pos; 1127 edge->opos = FT_MulFix( seg->pos, scale ); 1128 edge->pos = edge->opos; 1129 seg->edge_next = seg; 1130 } 1131 else 1132 { 1133 /* if an edge was found, simply add the segment to the edge's */ 1134 /* list */ 1135 seg->edge_next = found->first; 1136 found->last->edge_next = seg; 1137 found->last = seg; 1138 } 1139 } 1140 1141 /******************************************************************* 1142 * 1143 * Good, we now compute each edge's properties according to the 1144 * segments found on its position. Basically, these are 1145 * 1146 * - the edge's main direction 1147 * - stem edge, serif edge or both (which defaults to stem then) 1148 * - rounded edge, straight or both (which defaults to straight) 1149 * - link for edge 1150 * 1151 */ 1152 1153 /* first of all, set the `edge' field in each segment -- this is */ 1154 /* required in order to compute edge links */ 1155 1156 /* 1157 * Note that removing this loop and setting the `edge' field of each 1158 * segment directly in the code above slows down execution speed for 1159 * some reasons on platforms like the Sun. 1160 */ 1161 { 1162 AF_Edge edges = axis->edges; 1163 AF_Edge edge_limit = edges + axis->num_edges; 1164 AF_Edge edge; 1165 1166 1167 for ( edge = edges; edge < edge_limit; edge++ ) 1168 { 1169 seg = edge->first; 1170 if ( seg ) 1171 do 1172 { 1173 seg->edge = edge; 1174 seg = seg->edge_next; 1175 1176 } while ( seg != edge->first ); 1177 } 1178 1179 /* now compute each edge properties */ 1180 for ( edge = edges; edge < edge_limit; edge++ ) 1181 { 1182 FT_Int is_round = 0; /* does it contain round segments? */ 1183 FT_Int is_straight = 0; /* does it contain straight segments? */ 1184 1185 1186 seg = edge->first; 1187 if ( !seg ) 1188 goto Skip_Loop; 1189 1190 do 1191 { 1192 FT_Bool is_serif; 1193 1194 1195 /* check for roundness of segment */ 1196 if ( seg->flags & AF_EDGE_ROUND ) 1197 is_round++; 1198 else 1199 is_straight++; 1200 1201 /* check for links -- if seg->serif is set, then seg->link must */ 1202 /* be ignored */ 1203 is_serif = FT_BOOL( seg->serif && seg->serif->edge != edge ); 1204 1205 if ( seg->link || is_serif ) 1206 { 1207 AF_Edge edge2; 1208 AF_Segment seg2; 1209 1210 1211 edge2 = edge->link; 1212 seg2 = seg->link; 1213 1214 if ( is_serif ) 1215 { 1216 seg2 = seg->serif; 1217 edge2 = edge->serif; 1218 } 1219 1220 if ( edge2 ) 1221 { 1222 FT_Pos edge_delta; 1223 FT_Pos seg_delta; 1224 1225 1226 edge_delta = edge->fpos - edge2->fpos; 1227 if ( edge_delta < 0 ) 1228 edge_delta = -edge_delta; 1229 1230 seg_delta = AF_SEGMENT_DIST( seg, seg2 ); 1231 1232 if ( seg_delta < edge_delta ) 1233 edge2 = seg2->edge; 1234 } 1235 else 1236 edge2 = seg2->edge; 1237 1238 if ( is_serif ) 1239 { 1240 edge->serif = edge2; 1241 edge2->flags |= AF_EDGE_SERIF; 1242 } 1243 else 1244 edge->link = edge2; 1245 } 1246 1247 seg = seg->edge_next; 1248 1249 } while ( seg != edge->first ); 1250 1251 Skip_Loop: 1252 /* set the round/straight flags */ 1253 edge->flags = AF_EDGE_NORMAL; 1254 1255 if ( is_round > 0 && is_round >= is_straight ) 1256 edge->flags |= AF_EDGE_ROUND; 1257 1258 /* get rid of serifs if link is set */ 1259 /* XXX: This gets rid of many unpleasant artefacts! */ 1260 /* Example: the `c' in cour.pfa at size 13 */ 1261 1262 if ( edge->serif && edge->link ) 1263 edge->serif = NULL; 1264 } 1265 } 1266 1267 Exit: 1268 return error; 1269 } 1270 1271 1272 /* Detect segments and edges for given dimension. */ 1273 1274 static FT_Error 1275 af_cjk_hints_detect_features( AF_GlyphHints hints, 1276 AF_Dimension dim ) 1277 { 1278 FT_Error error; 1279 1280 1281 error = af_cjk_hints_compute_segments( hints, dim ); 1282 if ( !error ) 1283 { 1284 af_cjk_hints_link_segments( hints, dim ); 1285 1286 error = af_cjk_hints_compute_edges( hints, dim ); 1287 } 1288 return error; 1289 } 1290 1291 1292 /* Compute all edges which lie within blue zones. */ 1293 1294 static void 1295 af_cjk_hints_compute_blue_edges( AF_GlyphHints hints, 1296 AF_CJKMetrics metrics, 1297 AF_Dimension dim ) 1298 { 1299 AF_AxisHints axis = &hints->axis[dim]; 1300 AF_Edge edge = axis->edges; 1301 AF_Edge edge_limit = edge + axis->num_edges; 1302 AF_CJKAxis cjk = &metrics->axis[dim]; 1303 FT_Fixed scale = cjk->scale; 1304 FT_Pos best_dist0; /* initial threshold */ 1305 1306 1307 /* compute the initial threshold as a fraction of the EM size */ 1308 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1309 1310 if ( best_dist0 > 64 / 2 ) /* maximum 1/2 pixel */ 1311 best_dist0 = 64 / 2; 1312 1313 /* compute which blue zones are active, i.e. have their scaled */ 1314 /* size < 3/4 pixels */ 1315 1316 /* If the distant between an edge and a blue zone is shorter than */ 1317 /* best_dist0, set the blue zone for the edge. Then search for */ 1318 /* the blue zone with the smallest best_dist to the edge. */ 1319 1320 for ( ; edge < edge_limit; edge++ ) 1321 { 1322 FT_UInt bb; 1323 AF_Width best_blue = NULL; 1324 FT_Pos best_dist = best_dist0; 1325 1326 1327 for ( bb = 0; bb < cjk->blue_count; bb++ ) 1328 { 1329 AF_CJKBlue blue = cjk->blues + bb; 1330 FT_Bool is_top_right_blue, is_major_dir; 1331 1332 1333 /* skip inactive blue zones (i.e., those that are too small) */ 1334 if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) ) 1335 continue; 1336 1337 /* if it is a top zone, check for right edges -- if it is a bottom */ 1338 /* zone, check for left edges */ 1339 /* */ 1340 /* of course, that's for TrueType */ 1341 is_top_right_blue = 1342 (FT_Byte)( ( blue->flags & AF_CJK_BLUE_TOP ) != 0 ); 1343 is_major_dir = 1344 FT_BOOL( edge->dir == axis->major_dir ); 1345 1346 /* if it is a top zone, the edge must be against the major */ 1347 /* direction; if it is a bottom zone, it must be in the major */ 1348 /* direction */ 1349 if ( is_top_right_blue ^ is_major_dir ) 1350 { 1351 FT_Pos dist; 1352 AF_Width compare; 1353 1354 1355 /* Compare the edge to the closest blue zone type */ 1356 if ( FT_ABS( edge->fpos - blue->ref.org ) > 1357 FT_ABS( edge->fpos - blue->shoot.org ) ) 1358 compare = &blue->shoot; 1359 else 1360 compare = &blue->ref; 1361 1362 dist = edge->fpos - compare->org; 1363 if ( dist < 0 ) 1364 dist = -dist; 1365 1366 dist = FT_MulFix( dist, scale ); 1367 if ( dist < best_dist ) 1368 { 1369 best_dist = dist; 1370 best_blue = compare; 1371 } 1372 } 1373 } 1374 1375 if ( best_blue ) 1376 edge->blue_edge = best_blue; 1377 } 1378 } 1379 1380 1381 /* Initalize hinting engine. */ 1382 1383 FT_LOCAL_DEF( FT_Error ) 1384 af_cjk_hints_init( AF_GlyphHints hints, 1385 AF_CJKMetrics metrics ) 1386 { 1387 FT_Render_Mode mode; 1388 FT_UInt32 scaler_flags, other_flags; 1389 1390 1391 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics ); 1392 1393 /* 1394 * correct x_scale and y_scale when needed, since they may have 1395 * been modified af_cjk_scale_dim above 1396 */ 1397 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1398 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1399 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1400 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1401 1402 /* compute flags depending on render mode, etc. */ 1403 mode = metrics->root.scaler.render_mode; 1404 1405 #if 0 /* AF_CONFIG_OPTION_USE_WARPER */ 1406 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1407 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1408 #endif 1409 1410 scaler_flags = hints->scaler_flags; 1411 other_flags = 0; 1412 1413 /* 1414 * We snap the width of vertical stems for the monochrome and 1415 * horizontal LCD rendering targets only. 1416 */ 1417 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1418 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1419 1420 /* 1421 * We snap the width of horizontal stems for the monochrome and 1422 * vertical LCD rendering targets only. 1423 */ 1424 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1425 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1426 1427 /* 1428 * We adjust stems to full pixels unless in `light' or `lcd' mode. 1429 */ 1430 if ( mode != FT_RENDER_MODE_LIGHT && mode != FT_RENDER_MODE_LCD ) 1431 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1432 1433 if ( mode == FT_RENDER_MODE_MONO ) 1434 other_flags |= AF_LATIN_HINTS_MONO; 1435 1436 scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE; 1437 1438 #ifdef AF_CONFIG_OPTION_USE_WARPER 1439 /* get (global) warper flag */ 1440 if ( !metrics->root.globals->module->warping ) 1441 scaler_flags |= AF_SCALER_FLAG_NO_WARPER; 1442 #endif 1443 1444 hints->scaler_flags = scaler_flags; 1445 hints->other_flags = other_flags; 1446 1447 return FT_Err_Ok; 1448 } 1449 1450 1451 /*************************************************************************/ 1452 /*************************************************************************/ 1453 /***** *****/ 1454 /***** C J K G L Y P H G R I D - F I T T I N G *****/ 1455 /***** *****/ 1456 /*************************************************************************/ 1457 /*************************************************************************/ 1458 1459 /* Snap a given width in scaled coordinates to one of the */ 1460 /* current standard widths. */ 1461 1462 static FT_Pos 1463 af_cjk_snap_width( AF_Width widths, 1464 FT_UInt count, 1465 FT_Pos width ) 1466 { 1467 FT_UInt n; 1468 FT_Pos best = 64 + 32 + 2; 1469 FT_Pos reference = width; 1470 FT_Pos scaled; 1471 1472 1473 for ( n = 0; n < count; n++ ) 1474 { 1475 FT_Pos w; 1476 FT_Pos dist; 1477 1478 1479 w = widths[n].cur; 1480 dist = width - w; 1481 if ( dist < 0 ) 1482 dist = -dist; 1483 if ( dist < best ) 1484 { 1485 best = dist; 1486 reference = w; 1487 } 1488 } 1489 1490 scaled = FT_PIX_ROUND( reference ); 1491 1492 if ( width >= reference ) 1493 { 1494 if ( width < scaled + 48 ) 1495 width = reference; 1496 } 1497 else 1498 { 1499 if ( width > scaled - 48 ) 1500 width = reference; 1501 } 1502 1503 return width; 1504 } 1505 1506 1507 /* Compute the snapped width of a given stem. */ 1508 /* There is a lot of voodoo in this function; changing the hard-coded */ 1509 /* parameters influence the whole hinting process. */ 1510 1511 static FT_Pos 1512 af_cjk_compute_stem_width( AF_GlyphHints hints, 1513 AF_Dimension dim, 1514 FT_Pos width, 1515 FT_UInt base_flags, 1516 FT_UInt stem_flags ) 1517 { 1518 AF_CJKMetrics metrics = (AF_CJKMetrics)hints->metrics; 1519 AF_CJKAxis axis = &metrics->axis[dim]; 1520 FT_Pos dist = width; 1521 FT_Int sign = 0; 1522 FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT ); 1523 1524 FT_UNUSED( base_flags ); 1525 FT_UNUSED( stem_flags ); 1526 1527 1528 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1529 return width; 1530 1531 if ( dist < 0 ) 1532 { 1533 dist = -width; 1534 sign = 1; 1535 } 1536 1537 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1538 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1539 { 1540 /* smooth hinting process: very lightly quantize the stem width */ 1541 1542 if ( axis->width_count > 0 ) 1543 { 1544 if ( FT_ABS( dist - axis->widths[0].cur ) < 40 ) 1545 { 1546 dist = axis->widths[0].cur; 1547 if ( dist < 48 ) 1548 dist = 48; 1549 1550 goto Done_Width; 1551 } 1552 } 1553 1554 if ( dist < 54 ) 1555 dist += ( 54 - dist ) / 2; 1556 else if ( dist < 3 * 64 ) 1557 { 1558 FT_Pos delta; 1559 1560 1561 delta = dist & 63; 1562 dist &= -64; 1563 1564 if ( delta < 10 ) 1565 dist += delta; 1566 else if ( delta < 22 ) 1567 dist += 10; 1568 else if ( delta < 42 ) 1569 dist += delta; 1570 else if ( delta < 54 ) 1571 dist += 54; 1572 else 1573 dist += delta; 1574 } 1575 } 1576 else 1577 { 1578 /* strong hinting process: snap the stem width to integer pixels */ 1579 1580 dist = af_cjk_snap_width( axis->widths, axis->width_count, dist ); 1581 1582 if ( vertical ) 1583 { 1584 /* in the case of vertical hinting, always round */ 1585 /* the stem heights to integer pixels */ 1586 1587 if ( dist >= 64 ) 1588 dist = ( dist + 16 ) & ~63; 1589 else 1590 dist = 64; 1591 } 1592 else 1593 { 1594 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1595 { 1596 /* monochrome horizontal hinting: snap widths to integer pixels */ 1597 /* with a different threshold */ 1598 1599 if ( dist < 64 ) 1600 dist = 64; 1601 else 1602 dist = ( dist + 32 ) & ~63; 1603 } 1604 else 1605 { 1606 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1607 /* approach: we strengthen small stems, round stems whose size */ 1608 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1609 1610 if ( dist < 48 ) 1611 dist = ( dist + 64 ) >> 1; 1612 1613 else if ( dist < 128 ) 1614 dist = ( dist + 22 ) & ~63; 1615 else 1616 /* round otherwise to prevent color fringes in LCD mode */ 1617 dist = ( dist + 32 ) & ~63; 1618 } 1619 } 1620 } 1621 1622 Done_Width: 1623 if ( sign ) 1624 dist = -dist; 1625 1626 return dist; 1627 } 1628 1629 1630 /* Align one stem edge relative to the previous stem edge. */ 1631 1632 static void 1633 af_cjk_align_linked_edge( AF_GlyphHints hints, 1634 AF_Dimension dim, 1635 AF_Edge base_edge, 1636 AF_Edge stem_edge ) 1637 { 1638 FT_Pos dist = stem_edge->opos - base_edge->opos; 1639 1640 FT_Pos fitted_width = af_cjk_compute_stem_width( hints, dim, dist, 1641 base_edge->flags, 1642 stem_edge->flags ); 1643 1644 1645 stem_edge->pos = base_edge->pos + fitted_width; 1646 1647 FT_TRACE5(( " CJKLINK: edge %d @%d (opos=%.2f) linked to %.2f," 1648 " dist was %.2f, now %.2f\n", 1649 stem_edge - hints->axis[dim].edges, stem_edge->fpos, 1650 stem_edge->opos / 64.0, stem_edge->pos / 64.0, 1651 dist / 64.0, fitted_width / 64.0 )); 1652 } 1653 1654 1655 /* Shift the coordinates of the `serif' edge by the same amount */ 1656 /* as the corresponding `base' edge has been moved already. */ 1657 1658 static void 1659 af_cjk_align_serif_edge( AF_GlyphHints hints, 1660 AF_Edge base, 1661 AF_Edge serif ) 1662 { 1663 FT_UNUSED( hints ); 1664 1665 serif->pos = base->pos + ( serif->opos - base->opos ); 1666 } 1667 1668 1669 /*************************************************************************/ 1670 /*************************************************************************/ 1671 /*************************************************************************/ 1672 /**** ****/ 1673 /**** E D G E H I N T I N G ****/ 1674 /**** ****/ 1675 /*************************************************************************/ 1676 /*************************************************************************/ 1677 /*************************************************************************/ 1678 1679 1680 #define AF_LIGHT_MODE_MAX_HORZ_GAP 9 1681 #define AF_LIGHT_MODE_MAX_VERT_GAP 15 1682 #define AF_LIGHT_MODE_MAX_DELTA_ABS 14 1683 1684 1685 static FT_Pos 1686 af_hint_normal_stem( AF_GlyphHints hints, 1687 AF_Edge edge, 1688 AF_Edge edge2, 1689 FT_Pos anchor, 1690 AF_Dimension dim ) 1691 { 1692 FT_Pos org_len, cur_len, org_center; 1693 FT_Pos cur_pos1, cur_pos2; 1694 FT_Pos d_off1, u_off1, d_off2, u_off2, delta; 1695 FT_Pos offset; 1696 FT_Pos threshold = 64; 1697 1698 1699 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1700 { 1701 if ( ( edge->flags & AF_EDGE_ROUND ) && 1702 ( edge2->flags & AF_EDGE_ROUND ) ) 1703 { 1704 if ( dim == AF_DIMENSION_VERT ) 1705 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP; 1706 else 1707 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP; 1708 } 1709 else 1710 { 1711 if ( dim == AF_DIMENSION_VERT ) 1712 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3; 1713 else 1714 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3; 1715 } 1716 } 1717 1718 org_len = edge2->opos - edge->opos; 1719 cur_len = af_cjk_compute_stem_width( hints, dim, org_len, 1720 edge->flags, 1721 edge2->flags ); 1722 1723 org_center = ( edge->opos + edge2->opos ) / 2 + anchor; 1724 cur_pos1 = org_center - cur_len / 2; 1725 cur_pos2 = cur_pos1 + cur_len; 1726 d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 ); 1727 d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 ); 1728 u_off1 = 64 - d_off1; 1729 u_off2 = 64 - d_off2; 1730 delta = 0; 1731 1732 1733 if ( d_off1 == 0 || d_off2 == 0 ) 1734 goto Exit; 1735 1736 if ( cur_len <= threshold ) 1737 { 1738 if ( d_off2 < cur_len ) 1739 { 1740 if ( u_off1 <= d_off2 ) 1741 delta = u_off1; 1742 else 1743 delta = -d_off2; 1744 } 1745 1746 goto Exit; 1747 } 1748 1749 if ( threshold < 64 ) 1750 { 1751 if ( d_off1 >= threshold || u_off1 >= threshold || 1752 d_off2 >= threshold || u_off2 >= threshold ) 1753 goto Exit; 1754 } 1755 1756 offset = cur_len & 63; 1757 1758 if ( offset < 32 ) 1759 { 1760 if ( u_off1 <= offset || d_off2 <= offset ) 1761 goto Exit; 1762 } 1763 else 1764 offset = 64 - threshold; 1765 1766 d_off1 = threshold - u_off1; 1767 u_off1 = u_off1 - offset; 1768 u_off2 = threshold - d_off2; 1769 d_off2 = d_off2 - offset; 1770 1771 if ( d_off1 <= u_off1 ) 1772 u_off1 = -d_off1; 1773 1774 if ( d_off2 <= u_off2 ) 1775 u_off2 = -d_off2; 1776 1777 if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) ) 1778 delta = u_off1; 1779 else 1780 delta = u_off2; 1781 1782 Exit: 1783 1784 #if 1 1785 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) 1786 { 1787 if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS ) 1788 delta = AF_LIGHT_MODE_MAX_DELTA_ABS; 1789 else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS ) 1790 delta = -AF_LIGHT_MODE_MAX_DELTA_ABS; 1791 } 1792 #endif 1793 1794 cur_pos1 += delta; 1795 1796 if ( edge->opos < edge2->opos ) 1797 { 1798 edge->pos = cur_pos1; 1799 edge2->pos = cur_pos1 + cur_len; 1800 } 1801 else 1802 { 1803 edge->pos = cur_pos1 + cur_len; 1804 edge2->pos = cur_pos1; 1805 } 1806 1807 return delta; 1808 } 1809 1810 1811 /* The main grid-fitting routine. */ 1812 1813 static void 1814 af_cjk_hint_edges( AF_GlyphHints hints, 1815 AF_Dimension dim ) 1816 { 1817 AF_AxisHints axis = &hints->axis[dim]; 1818 AF_Edge edges = axis->edges; 1819 AF_Edge edge_limit = edges + axis->num_edges; 1820 FT_PtrDist n_edges; 1821 AF_Edge edge; 1822 AF_Edge anchor = NULL; 1823 FT_Pos delta = 0; 1824 FT_Int skipped = 0; 1825 FT_Bool has_last_stem = FALSE; 1826 FT_Pos last_stem_pos = 0; 1827 1828 #ifdef FT_DEBUG_LEVEL_TRACE 1829 FT_UInt num_actions = 0; 1830 #endif 1831 1832 1833 FT_TRACE5(( "cjk %s edge hinting (style `%s')\n", 1834 dim == AF_DIMENSION_VERT ? "horizontal" : "vertical", 1835 af_style_names[hints->metrics->style_class->style] )); 1836 1837 /* we begin by aligning all stems relative to the blue zone */ 1838 1839 if ( AF_HINTS_DO_BLUES( hints ) ) 1840 { 1841 for ( edge = edges; edge < edge_limit; edge++ ) 1842 { 1843 AF_Width blue; 1844 AF_Edge edge1, edge2; 1845 1846 1847 if ( edge->flags & AF_EDGE_DONE ) 1848 continue; 1849 1850 blue = edge->blue_edge; 1851 edge1 = NULL; 1852 edge2 = edge->link; 1853 1854 if ( blue ) 1855 { 1856 edge1 = edge; 1857 } 1858 else if ( edge2 && edge2->blue_edge ) 1859 { 1860 blue = edge2->blue_edge; 1861 edge1 = edge2; 1862 edge2 = edge; 1863 } 1864 1865 if ( !edge1 ) 1866 continue; 1867 1868 #ifdef FT_DEBUG_LEVEL_TRACE 1869 FT_TRACE5(( " CJKBLUE: edge %d @%d (opos=%.2f) snapped to %.2f," 1870 " was %.2f\n", 1871 edge1 - edges, edge1->fpos, edge1->opos / 64.0, 1872 blue->fit / 64.0, edge1->pos / 64.0 )); 1873 1874 num_actions++; 1875 #endif 1876 1877 edge1->pos = blue->fit; 1878 edge1->flags |= AF_EDGE_DONE; 1879 1880 if ( edge2 && !edge2->blue_edge ) 1881 { 1882 af_cjk_align_linked_edge( hints, dim, edge1, edge2 ); 1883 edge2->flags |= AF_EDGE_DONE; 1884 1885 #ifdef FT_DEBUG_LEVEL_TRACE 1886 num_actions++; 1887 #endif 1888 } 1889 1890 if ( !anchor ) 1891 anchor = edge; 1892 } 1893 } 1894 1895 /* now we align all stem edges. */ 1896 for ( edge = edges; edge < edge_limit; edge++ ) 1897 { 1898 AF_Edge edge2; 1899 1900 1901 if ( edge->flags & AF_EDGE_DONE ) 1902 continue; 1903 1904 /* skip all non-stem edges */ 1905 edge2 = edge->link; 1906 if ( !edge2 ) 1907 { 1908 skipped++; 1909 continue; 1910 } 1911 1912 /* Some CJK characters have so many stems that 1913 * the hinter is likely to merge two adjacent ones. 1914 * To solve this problem, if either edge of a stem 1915 * is too close to the previous one, we avoid 1916 * aligning the two edges, but rather interpolate 1917 * their locations at the end of this function in 1918 * order to preserve the space between the stems. 1919 */ 1920 if ( has_last_stem && 1921 ( edge->pos < last_stem_pos + 64 || 1922 edge2->pos < last_stem_pos + 64 ) ) 1923 { 1924 skipped++; 1925 continue; 1926 } 1927 1928 /* now align the stem */ 1929 1930 /* this should not happen, but it's better to be safe */ 1931 if ( edge2->blue_edge ) 1932 { 1933 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1934 1935 af_cjk_align_linked_edge( hints, dim, edge2, edge ); 1936 edge->flags |= AF_EDGE_DONE; 1937 1938 #ifdef FT_DEBUG_LEVEL_TRACE 1939 num_actions++; 1940 #endif 1941 1942 continue; 1943 } 1944 1945 if ( edge2 < edge ) 1946 { 1947 af_cjk_align_linked_edge( hints, dim, edge2, edge ); 1948 edge->flags |= AF_EDGE_DONE; 1949 1950 #ifdef FT_DEBUG_LEVEL_TRACE 1951 num_actions++; 1952 #endif 1953 1954 /* We rarely reaches here it seems; 1955 * usually the two edges belonging 1956 * to one stem are marked as DONE together 1957 */ 1958 has_last_stem = TRUE; 1959 last_stem_pos = edge->pos; 1960 continue; 1961 } 1962 1963 if ( dim != AF_DIMENSION_VERT && !anchor ) 1964 { 1965 1966 #if 0 1967 if ( fixedpitch ) 1968 { 1969 AF_Edge left = edge; 1970 AF_Edge right = edge_limit - 1; 1971 AF_EdgeRec left1, left2, right1, right2; 1972 FT_Pos target, center1, center2; 1973 FT_Pos delta1, delta2, d1, d2; 1974 1975 1976 while ( right > left && !right->link ) 1977 right--; 1978 1979 left1 = *left; 1980 left2 = *left->link; 1981 right1 = *right->link; 1982 right2 = *right; 1983 1984 delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2; 1985 target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16; 1986 1987 delta1 = delta; 1988 delta1 += af_hint_normal_stem( hints, left, left->link, 1989 delta1, 0 ); 1990 1991 if ( left->link != right ) 1992 af_hint_normal_stem( hints, right->link, right, delta1, 0 ); 1993 1994 center1 = left->pos + ( right->pos - left->pos ) / 2; 1995 1996 if ( center1 >= target ) 1997 delta2 = delta - 32; 1998 else 1999 delta2 = delta + 32; 2000 2001 delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 ); 2002 2003 if ( delta1 != delta2 ) 2004 { 2005 if ( left->link != right ) 2006 af_hint_normal_stem( hints, &right1, &right2, delta2, 0 ); 2007 2008 center2 = left1.pos + ( right2.pos - left1.pos ) / 2; 2009 2010 d1 = center1 - target; 2011 d2 = center2 - target; 2012 2013 if ( FT_ABS( d2 ) < FT_ABS( d1 ) ) 2014 { 2015 left->pos = left1.pos; 2016 left->link->pos = left2.pos; 2017 2018 if ( left->link != right ) 2019 { 2020 right->link->pos = right1.pos; 2021 right->pos = right2.pos; 2022 } 2023 2024 delta1 = delta2; 2025 } 2026 } 2027 2028 delta = delta1; 2029 right->link->flags |= AF_EDGE_DONE; 2030 right->flags |= AF_EDGE_DONE; 2031 } 2032 else 2033 2034 #endif /* 0 */ 2035 2036 delta = af_hint_normal_stem( hints, edge, edge2, 0, 2037 AF_DIMENSION_HORZ ); 2038 } 2039 else 2040 af_hint_normal_stem( hints, edge, edge2, delta, dim ); 2041 2042 #if 0 2043 printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n", 2044 edge - edges, edge2 - edges, 2045 ( edge->pos - edge->opos ) / 64.0, 2046 ( edge2->pos - edge2->opos ) / 64.0 ); 2047 #endif 2048 2049 anchor = edge; 2050 edge->flags |= AF_EDGE_DONE; 2051 edge2->flags |= AF_EDGE_DONE; 2052 has_last_stem = TRUE; 2053 last_stem_pos = edge2->pos; 2054 } 2055 2056 /* make sure that lowercase m's maintain their symmetry */ 2057 2058 /* In general, lowercase m's have six vertical edges if they are sans */ 2059 /* serif, or twelve if they are with serifs. This implementation is */ 2060 /* based on that assumption, and seems to work very well with most */ 2061 /* faces. However, if for a certain face this assumption is not */ 2062 /* true, the m is just rendered like before. In addition, any stem */ 2063 /* correction will only be applied to symmetrical glyphs (even if the */ 2064 /* glyph is not an m), so the potential for unwanted distortion is */ 2065 /* relatively low. */ 2066 2067 /* We don't handle horizontal edges since we can't easily assure that */ 2068 /* the third (lowest) stem aligns with the base line; it might end up */ 2069 /* one pixel higher or lower. */ 2070 2071 n_edges = edge_limit - edges; 2072 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 2073 { 2074 AF_Edge edge1, edge2, edge3; 2075 FT_Pos dist1, dist2, span; 2076 2077 2078 if ( n_edges == 6 ) 2079 { 2080 edge1 = edges; 2081 edge2 = edges + 2; 2082 edge3 = edges + 4; 2083 } 2084 else 2085 { 2086 edge1 = edges + 1; 2087 edge2 = edges + 5; 2088 edge3 = edges + 9; 2089 } 2090 2091 dist1 = edge2->opos - edge1->opos; 2092 dist2 = edge3->opos - edge2->opos; 2093 2094 span = dist1 - dist2; 2095 if ( span < 0 ) 2096 span = -span; 2097 2098 if ( edge1->link == edge1 + 1 && 2099 edge2->link == edge2 + 1 && 2100 edge3->link == edge3 + 1 && span < 8 ) 2101 { 2102 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2103 edge3->pos -= delta; 2104 if ( edge3->link ) 2105 edge3->link->pos -= delta; 2106 2107 /* move the serifs along with the stem */ 2108 if ( n_edges == 12 ) 2109 { 2110 ( edges + 8 )->pos -= delta; 2111 ( edges + 11 )->pos -= delta; 2112 } 2113 2114 edge3->flags |= AF_EDGE_DONE; 2115 if ( edge3->link ) 2116 edge3->link->flags |= AF_EDGE_DONE; 2117 } 2118 } 2119 2120 if ( !skipped ) 2121 goto Exit; 2122 2123 /* 2124 * now hint the remaining edges (serifs and single) in order 2125 * to complete our processing 2126 */ 2127 for ( edge = edges; edge < edge_limit; edge++ ) 2128 { 2129 if ( edge->flags & AF_EDGE_DONE ) 2130 continue; 2131 2132 if ( edge->serif ) 2133 { 2134 af_cjk_align_serif_edge( hints, edge->serif, edge ); 2135 edge->flags |= AF_EDGE_DONE; 2136 skipped--; 2137 } 2138 } 2139 2140 if ( !skipped ) 2141 goto Exit; 2142 2143 for ( edge = edges; edge < edge_limit; edge++ ) 2144 { 2145 AF_Edge before, after; 2146 2147 2148 if ( edge->flags & AF_EDGE_DONE ) 2149 continue; 2150 2151 before = after = edge; 2152 2153 while ( --before >= edges ) 2154 if ( before->flags & AF_EDGE_DONE ) 2155 break; 2156 2157 while ( ++after < edge_limit ) 2158 if ( after->flags & AF_EDGE_DONE ) 2159 break; 2160 2161 if ( before >= edges || after < edge_limit ) 2162 { 2163 if ( before < edges ) 2164 af_cjk_align_serif_edge( hints, after, edge ); 2165 else if ( after >= edge_limit ) 2166 af_cjk_align_serif_edge( hints, before, edge ); 2167 else 2168 { 2169 if ( after->fpos == before->fpos ) 2170 edge->pos = before->pos; 2171 else 2172 edge->pos = before->pos + 2173 FT_MulDiv( edge->fpos - before->fpos, 2174 after->pos - before->pos, 2175 after->fpos - before->fpos ); 2176 } 2177 } 2178 } 2179 2180 Exit: 2181 2182 #ifdef FT_DEBUG_LEVEL_TRACE 2183 if ( !num_actions ) 2184 FT_TRACE5(( " (none)\n" )); 2185 FT_TRACE5(( "\n" )); 2186 #endif 2187 2188 return; 2189 } 2190 2191 2192 static void 2193 af_cjk_align_edge_points( AF_GlyphHints hints, 2194 AF_Dimension dim ) 2195 { 2196 AF_AxisHints axis = & hints->axis[dim]; 2197 AF_Edge edges = axis->edges; 2198 AF_Edge edge_limit = edges + axis->num_edges; 2199 AF_Edge edge; 2200 FT_Bool snapping; 2201 2202 2203 snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ && 2204 AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) || 2205 ( dim == AF_DIMENSION_VERT && 2206 AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ); 2207 2208 for ( edge = edges; edge < edge_limit; edge++ ) 2209 { 2210 /* move the points of each segment */ 2211 /* in each edge to the edge's position */ 2212 AF_Segment seg = edge->first; 2213 2214 2215 if ( snapping ) 2216 { 2217 do 2218 { 2219 AF_Point point = seg->first; 2220 2221 2222 for (;;) 2223 { 2224 if ( dim == AF_DIMENSION_HORZ ) 2225 { 2226 point->x = edge->pos; 2227 point->flags |= AF_FLAG_TOUCH_X; 2228 } 2229 else 2230 { 2231 point->y = edge->pos; 2232 point->flags |= AF_FLAG_TOUCH_Y; 2233 } 2234 2235 if ( point == seg->last ) 2236 break; 2237 2238 point = point->next; 2239 } 2240 2241 seg = seg->edge_next; 2242 2243 } while ( seg != edge->first ); 2244 } 2245 else 2246 { 2247 FT_Pos delta = edge->pos - edge->opos; 2248 2249 2250 do 2251 { 2252 AF_Point point = seg->first; 2253 2254 2255 for (;;) 2256 { 2257 if ( dim == AF_DIMENSION_HORZ ) 2258 { 2259 point->x += delta; 2260 point->flags |= AF_FLAG_TOUCH_X; 2261 } 2262 else 2263 { 2264 point->y += delta; 2265 point->flags |= AF_FLAG_TOUCH_Y; 2266 } 2267 2268 if ( point == seg->last ) 2269 break; 2270 2271 point = point->next; 2272 } 2273 2274 seg = seg->edge_next; 2275 2276 } while ( seg != edge->first ); 2277 } 2278 } 2279 } 2280 2281 2282 /* Apply the complete hinting algorithm to a CJK glyph. */ 2283 2284 FT_LOCAL_DEF( FT_Error ) 2285 af_cjk_hints_apply( FT_UInt glyph_index, 2286 AF_GlyphHints hints, 2287 FT_Outline* outline, 2288 AF_CJKMetrics metrics ) 2289 { 2290 FT_Error error; 2291 int dim; 2292 2293 FT_UNUSED( metrics ); 2294 FT_UNUSED( glyph_index ); 2295 2296 2297 error = af_glyph_hints_reload( hints, outline ); 2298 if ( error ) 2299 goto Exit; 2300 2301 /* analyze glyph outline */ 2302 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2303 { 2304 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2305 if ( error ) 2306 goto Exit; 2307 2308 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_HORZ ); 2309 } 2310 2311 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2312 { 2313 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT ); 2314 if ( error ) 2315 goto Exit; 2316 2317 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_VERT ); 2318 } 2319 2320 /* grid-fit the outline */ 2321 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2322 { 2323 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2324 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2325 { 2326 2327 #ifdef AF_CONFIG_OPTION_USE_WARPER 2328 if ( dim == AF_DIMENSION_HORZ && 2329 metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL && 2330 AF_HINTS_DO_WARP( hints ) ) 2331 { 2332 AF_WarperRec warper; 2333 FT_Fixed scale; 2334 FT_Pos delta; 2335 2336 2337 af_warper_compute( &warper, hints, (AF_Dimension)dim, 2338 &scale, &delta ); 2339 af_glyph_hints_scale_dim( hints, (AF_Dimension)dim, 2340 scale, delta ); 2341 continue; 2342 } 2343 #endif /* AF_CONFIG_OPTION_USE_WARPER */ 2344 2345 af_cjk_hint_edges( hints, (AF_Dimension)dim ); 2346 af_cjk_align_edge_points( hints, (AF_Dimension)dim ); 2347 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2348 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2349 } 2350 } 2351 2352 af_glyph_hints_save( hints, outline ); 2353 2354 Exit: 2355 return error; 2356 } 2357 2358 2359 /*************************************************************************/ 2360 /*************************************************************************/ 2361 /***** *****/ 2362 /***** C J K S C R I P T C L A S S *****/ 2363 /***** *****/ 2364 /*************************************************************************/ 2365 /*************************************************************************/ 2366 2367 2368 AF_DEFINE_WRITING_SYSTEM_CLASS( 2369 af_cjk_writing_system_class, 2370 2371 AF_WRITING_SYSTEM_CJK, 2372 2373 sizeof ( AF_CJKMetricsRec ), 2374 2375 (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init, /* style_metrics_init */ 2376 (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale, /* style_metrics_scale */ 2377 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */ 2378 (AF_WritingSystem_GetStdWidthsFunc)af_cjk_get_standard_widths, /* style_metrics_getstdw */ 2379 2380 (AF_WritingSystem_InitHintsFunc) af_cjk_hints_init, /* style_hints_init */ 2381 (AF_WritingSystem_ApplyHintsFunc) af_cjk_hints_apply /* style_hints_apply */ 2382 ) 2383 2384 2385 #else /* !AF_CONFIG_OPTION_CJK */ 2386 2387 2388 AF_DEFINE_WRITING_SYSTEM_CLASS( 2389 af_cjk_writing_system_class, 2390 2391 AF_WRITING_SYSTEM_CJK, 2392 2393 sizeof ( AF_CJKMetricsRec ), 2394 2395 (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init */ 2396 (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale */ 2397 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */ 2398 (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */ 2399 2400 (AF_WritingSystem_InitHintsFunc) NULL, /* style_hints_init */ 2401 (AF_WritingSystem_ApplyHintsFunc) NULL /* style_hints_apply */ 2402 ) 2403 2404 2405 #endif /* !AF_CONFIG_OPTION_CJK */ 2406 2407 2408 /* END */