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