1/***************************************************************************/ 2/* */ 3/* aflatin2.c */ 4/* */ 5/* Auto-fitter hinting routines for latin writing system (body). */ 6/* */ 7/* Copyright 2003-2013 by */ 8/* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9/* */ 10/* This file is part of the FreeType project, and may only be used, */ 11/* modified, and distributed under the terms of the FreeType project */ 12/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13/* this file you indicate that you have read the license and */ 14/* understand and accept it fully. */ 15/* */ 16/***************************************************************************/ 17 18 19#include FT_ADVANCES_H 20 21#include "afglobal.h" 22#include "aflatin.h" 23#include "aflatin2.h" 24#include "aferrors.h" 25 26 27#ifdef AF_CONFIG_OPTION_USE_WARPER 28#include "afwarp.h" 29#endif 30 31 32 /*************************************************************************/ 33 /* */ 34 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 35 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 36 /* messages during execution. */ 37 /* */ 38#undef FT_COMPONENT 39#define FT_COMPONENT trace_aflatin2 40 41 42 FT_LOCAL_DEF( FT_Error ) 43 af_latin2_hints_compute_segments( AF_GlyphHints hints, 44 AF_Dimension dim ); 45 46 FT_LOCAL_DEF( void ) 47 af_latin2_hints_link_segments( AF_GlyphHints hints, 48 AF_Dimension dim ); 49 50 /*************************************************************************/ 51 /*************************************************************************/ 52 /***** *****/ 53 /***** L A T I N G L O B A L M E T R I C S *****/ 54 /***** *****/ 55 /*************************************************************************/ 56 /*************************************************************************/ 57 58 FT_LOCAL_DEF( void ) 59 af_latin2_metrics_init_widths( AF_LatinMetrics metrics, 60 FT_Face face ) 61 { 62 /* scan the array of segments in each direction */ 63 AF_GlyphHintsRec hints[1]; 64 65 66 af_glyph_hints_init( hints, face->memory ); 67 68 metrics->axis[AF_DIMENSION_HORZ].width_count = 0; 69 metrics->axis[AF_DIMENSION_VERT].width_count = 0; 70 71 { 72 FT_Error error; 73 FT_UInt glyph_index; 74 int dim; 75 AF_LatinMetricsRec dummy[1]; 76 AF_Scaler scaler = &dummy->root.scaler; 77 78 79 glyph_index = FT_Get_Char_Index( 80 face, 81 metrics->root.style_class->standard_char ); 82 if ( glyph_index == 0 ) 83 goto Exit; 84 85 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 86 if ( error || face->glyph->outline.n_points <= 0 ) 87 goto Exit; 88 89 FT_ZERO( dummy ); 90 91 dummy->units_per_em = metrics->units_per_em; 92 scaler->x_scale = scaler->y_scale = 0x10000L; 93 scaler->x_delta = scaler->y_delta = 0; 94 scaler->face = face; 95 scaler->render_mode = FT_RENDER_MODE_NORMAL; 96 scaler->flags = 0; 97 98 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy ); 99 100 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 101 if ( error ) 102 goto Exit; 103 104 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 105 { 106 AF_LatinAxis axis = &metrics->axis[dim]; 107 AF_AxisHints axhints = &hints->axis[dim]; 108 AF_Segment seg, limit, link; 109 FT_UInt num_widths = 0; 110 111 112 error = af_latin2_hints_compute_segments( hints, 113 (AF_Dimension)dim ); 114 if ( error ) 115 goto Exit; 116 117 af_latin2_hints_link_segments( hints, 118 (AF_Dimension)dim ); 119 120 seg = axhints->segments; 121 limit = seg + axhints->num_segments; 122 123 for ( ; seg < limit; seg++ ) 124 { 125 link = seg->link; 126 127 /* we only consider stem segments there! */ 128 if ( link && link->link == seg && link > seg ) 129 { 130 FT_Pos dist; 131 132 133 dist = seg->pos - link->pos; 134 if ( dist < 0 ) 135 dist = -dist; 136 137 if ( num_widths < AF_LATIN_MAX_WIDTHS ) 138 axis->widths[num_widths++].org = dist; 139 } 140 } 141 142 af_sort_widths( num_widths, axis->widths ); 143 axis->width_count = num_widths; 144 } 145 146 Exit: 147 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 148 { 149 AF_LatinAxis axis = &metrics->axis[dim]; 150 FT_Pos stdw; 151 152 153 stdw = ( axis->width_count > 0 ) 154 ? axis->widths[0].org 155 : AF_LATIN_CONSTANT( metrics, 50 ); 156 157 /* let's try 20% of the smallest width */ 158 axis->edge_distance_threshold = stdw / 5; 159 axis->standard_width = stdw; 160 axis->extra_light = 0; 161 } 162 } 163 164 af_glyph_hints_done( hints ); 165 } 166 167 168 169#define AF_LATIN_MAX_TEST_CHARACTERS 12 170 171 172 static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES] 173 [AF_LATIN_MAX_TEST_CHARACTERS+1] = 174 { 175 "THEZOCQS", 176 "HEZLOCUS", 177 "fijkdbh", 178 "xzroesc", 179 "xzroesc", 180 "pqgjy" 181 }; 182 183 184 static void 185 af_latin2_metrics_init_blues( AF_LatinMetrics metrics, 186 FT_Face face ) 187 { 188 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS]; 189 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS]; 190 FT_Int num_flats; 191 FT_Int num_rounds; 192 FT_Int bb; 193 AF_LatinBlue blue; 194 FT_Error error; 195 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT]; 196 FT_GlyphSlot glyph = face->glyph; 197 198 199 /* we compute the blues simply by loading each character from the */ 200 /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */ 201 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */ 202 203 FT_TRACE5(( "blue zones computation\n" 204 "======================\n\n" )); 205 206 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 207 { 208 const char* p = af_latin2_blue_chars[bb]; 209 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS; 210 FT_Pos* blue_ref; 211 FT_Pos* blue_shoot; 212 213 214 FT_TRACE5(( "blue zone %d:\n", bb )); 215 216 num_flats = 0; 217 num_rounds = 0; 218 219 for ( ; p < limit && *p; p++ ) 220 { 221 FT_UInt glyph_index; 222 FT_Int best_point, best_y, best_first, best_last; 223 FT_Vector* points; 224 FT_Bool round; 225 226 227 /* load the character in the face -- skip unknown or empty ones */ 228 glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p ); 229 if ( glyph_index == 0 ) 230 continue; 231 232 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 233 if ( error || glyph->outline.n_points <= 0 ) 234 continue; 235 236 /* now compute min or max point indices and coordinates */ 237 points = glyph->outline.points; 238 best_point = -1; 239 best_y = 0; /* make compiler happy */ 240 best_first = 0; /* ditto */ 241 best_last = 0; /* ditto */ 242 243 { 244 FT_Int nn; 245 FT_Int first = 0; 246 FT_Int last = -1; 247 248 249 for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ ) 250 { 251 FT_Int old_best_point = best_point; 252 FT_Int pp; 253 254 255 last = glyph->outline.contours[nn]; 256 257 /* Avoid single-point contours since they are never rasterized. */ 258 /* In some fonts, they correspond to mark attachment points */ 259 /* which are way outside of the glyph's real outline. */ 260 if ( last == first ) 261 continue; 262 263 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 264 { 265 for ( pp = first; pp <= last; pp++ ) 266 if ( best_point < 0 || points[pp].y > best_y ) 267 { 268 best_point = pp; 269 best_y = points[pp].y; 270 } 271 } 272 else 273 { 274 for ( pp = first; pp <= last; pp++ ) 275 if ( best_point < 0 || points[pp].y < best_y ) 276 { 277 best_point = pp; 278 best_y = points[pp].y; 279 } 280 } 281 282 if ( best_point != old_best_point ) 283 { 284 best_first = first; 285 best_last = last; 286 } 287 } 288 FT_TRACE5(( " %c %d", *p, best_y )); 289 } 290 291 /* now check whether the point belongs to a straight or round */ 292 /* segment; we first need to find in which contour the extremum */ 293 /* lies, then inspect its previous and next points */ 294 { 295 FT_Pos best_x = points[best_point].x; 296 FT_Int start, end, prev, next; 297 FT_Pos dist; 298 299 300 /* now look for the previous and next points that are not on the */ 301 /* same Y coordinate. Threshold the `closeness'... */ 302 start = end = best_point; 303 304 do 305 { 306 prev = start - 1; 307 if ( prev < best_first ) 308 prev = best_last; 309 310 dist = FT_ABS( points[prev].y - best_y ); 311 /* accept a small distance or a small angle (both values are */ 312 /* heuristic; value 20 corresponds to approx. 2.9 degrees) */ 313 if ( dist > 5 ) 314 if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist ) 315 break; 316 317 start = prev; 318 319 } while ( start != best_point ); 320 321 do 322 { 323 next = end + 1; 324 if ( next > best_last ) 325 next = best_first; 326 327 dist = FT_ABS( points[next].y - best_y ); 328 if ( dist > 5 ) 329 if ( FT_ABS( points[next].x - best_x ) <= 20 * dist ) 330 break; 331 332 end = next; 333 334 } while ( end != best_point ); 335 336 /* now, set the `round' flag depending on the segment's kind */ 337 round = FT_BOOL( 338 FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON || 339 FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON ); 340 341 FT_TRACE5(( " (%s)\n", round ? "round" : "flat" )); 342 } 343 344 if ( round ) 345 rounds[num_rounds++] = best_y; 346 else 347 flats[num_flats++] = best_y; 348 } 349 350 if ( num_flats == 0 && num_rounds == 0 ) 351 { 352 /* 353 * we couldn't find a single glyph to compute this blue zone, 354 * we will simply ignore it then 355 */ 356 FT_TRACE5(( " empty\n" )); 357 continue; 358 } 359 360 /* we have computed the contents of the `rounds' and `flats' tables, */ 361 /* now determine the reference and overshoot position of the blue -- */ 362 /* we simply take the median value after a simple sort */ 363 af_sort_pos( num_rounds, rounds ); 364 af_sort_pos( num_flats, flats ); 365 366 blue = & axis->blues[axis->blue_count]; 367 blue_ref = & blue->ref.org; 368 blue_shoot = & blue->shoot.org; 369 370 axis->blue_count++; 371 372 if ( num_flats == 0 ) 373 { 374 *blue_ref = 375 *blue_shoot = rounds[num_rounds / 2]; 376 } 377 else if ( num_rounds == 0 ) 378 { 379 *blue_ref = 380 *blue_shoot = flats[num_flats / 2]; 381 } 382 else 383 { 384 *blue_ref = flats[num_flats / 2]; 385 *blue_shoot = rounds[num_rounds / 2]; 386 } 387 388 /* there are sometimes problems: if the overshoot position of top */ 389 /* zones is under its reference position, or the opposite for bottom */ 390 /* zones. We must thus check everything there and correct the errors */ 391 if ( *blue_shoot != *blue_ref ) 392 { 393 FT_Pos ref = *blue_ref; 394 FT_Pos shoot = *blue_shoot; 395 FT_Bool over_ref = FT_BOOL( shoot > ref ); 396 397 398 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref ) 399 { 400 *blue_ref = 401 *blue_shoot = ( shoot + ref ) / 2; 402 403 FT_TRACE5(( " [overshoot smaller than reference," 404 " taking mean value]\n" )); 405 } 406 } 407 408 blue->flags = 0; 409 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 410 blue->flags |= AF_LATIN_BLUE_TOP; 411 412 /* 413 * The following flag is used later to adjust the y and x scales 414 * in order to optimize the pixel grid alignment of the top of small 415 * letters. 416 */ 417 if ( AF_LATIN_IS_X_HEIGHT_BLUE( bb ) ) 418 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT; 419 420 FT_TRACE5(( " -> reference = %ld\n" 421 " overshoot = %ld\n", 422 *blue_ref, *blue_shoot )); 423 } 424 425 return; 426 } 427 428 429 FT_LOCAL_DEF( void ) 430 af_latin2_metrics_check_digits( AF_LatinMetrics metrics, 431 FT_Face face ) 432 { 433 FT_UInt i; 434 FT_Bool started = 0, same_width = 1; 435 FT_Fixed advance, old_advance = 0; 436 437 438 /* check whether all ASCII digits have the same advance width; */ 439 /* digit `0' is 0x30 in all supported charmaps */ 440 for ( i = 0x30; i <= 0x39; i++ ) 441 { 442 FT_UInt glyph_index; 443 444 445 glyph_index = FT_Get_Char_Index( face, i ); 446 if ( glyph_index == 0 ) 447 continue; 448 449 if ( FT_Get_Advance( face, glyph_index, 450 FT_LOAD_NO_SCALE | 451 FT_LOAD_NO_HINTING | 452 FT_LOAD_IGNORE_TRANSFORM, 453 &advance ) ) 454 continue; 455 456 if ( started ) 457 { 458 if ( advance != old_advance ) 459 { 460 same_width = 0; 461 break; 462 } 463 } 464 else 465 { 466 old_advance = advance; 467 started = 1; 468 } 469 } 470 471 metrics->root.digits_have_same_width = same_width; 472 } 473 474 475 FT_LOCAL_DEF( FT_Error ) 476 af_latin2_metrics_init( AF_LatinMetrics metrics, 477 FT_Face face ) 478 { 479 FT_Error error = FT_Err_Ok; 480 FT_CharMap oldmap = face->charmap; 481 FT_UInt ee; 482 483 static const FT_Encoding latin_encodings[] = 484 { 485 FT_ENCODING_UNICODE, 486 FT_ENCODING_APPLE_ROMAN, 487 FT_ENCODING_ADOBE_STANDARD, 488 FT_ENCODING_ADOBE_LATIN_1, 489 FT_ENCODING_NONE /* end of list */ 490 }; 491 492 493 metrics->units_per_em = face->units_per_EM; 494 495 /* do we have a latin charmap in there? */ 496 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ ) 497 { 498 error = FT_Select_Charmap( face, latin_encodings[ee] ); 499 if ( !error ) 500 break; 501 } 502 503 if ( !error ) 504 { 505 af_latin2_metrics_init_widths( metrics, face ); 506 af_latin2_metrics_init_blues( metrics, face ); 507 af_latin2_metrics_check_digits( metrics, face ); 508 } 509 510 FT_Set_Charmap( face, oldmap ); 511 return FT_Err_Ok; 512 } 513 514 515 static void 516 af_latin2_metrics_scale_dim( AF_LatinMetrics metrics, 517 AF_Scaler scaler, 518 AF_Dimension dim ) 519 { 520 FT_Fixed scale; 521 FT_Pos delta; 522 AF_LatinAxis axis; 523 FT_UInt nn; 524 525 526 if ( dim == AF_DIMENSION_HORZ ) 527 { 528 scale = scaler->x_scale; 529 delta = scaler->x_delta; 530 } 531 else 532 { 533 scale = scaler->y_scale; 534 delta = scaler->y_delta; 535 } 536 537 axis = &metrics->axis[dim]; 538 539 if ( axis->org_scale == scale && axis->org_delta == delta ) 540 return; 541 542 axis->org_scale = scale; 543 axis->org_delta = delta; 544 545 /* 546 * correct Y scale to optimize the alignment of the top of small 547 * letters to the pixel grid 548 */ 549 if ( dim == AF_DIMENSION_VERT ) 550 { 551 AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT]; 552 AF_LatinBlue blue = NULL; 553 554 555 for ( nn = 0; nn < vaxis->blue_count; nn++ ) 556 { 557 if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT ) 558 { 559 blue = &vaxis->blues[nn]; 560 break; 561 } 562 } 563 564 if ( blue ) 565 { 566 FT_Pos scaled; 567 FT_Pos threshold; 568 FT_Pos fitted; 569 FT_UInt limit; 570 FT_UInt ppem; 571 572 573 scaled = FT_MulFix( blue->shoot.org, scaler->y_scale ); 574 ppem = metrics->root.scaler.face->size->metrics.x_ppem; 575 limit = metrics->root.globals->increase_x_height; 576 threshold = 40; 577 578 /* if the `increase-x-height' property is active, */ 579 /* we round up much more often */ 580 if ( limit && 581 ppem <= limit && 582 ppem >= AF_PROP_INCREASE_X_HEIGHT_MIN ) 583 threshold = 52; 584 585 fitted = ( scaled + threshold ) & ~63; 586 587#if 1 588 if ( scaled != fitted ) 589 { 590 scale = FT_MulDiv( scale, fitted, scaled ); 591 FT_TRACE5(( "== scaled x-top = %.2g" 592 " fitted = %.2g, scaling = %.4g\n", 593 scaled / 64.0, fitted / 64.0, 594 ( fitted * 1.0 ) / scaled )); 595 } 596#endif 597 } 598 } 599 600 axis->scale = scale; 601 axis->delta = delta; 602 603 if ( dim == AF_DIMENSION_HORZ ) 604 { 605 metrics->root.scaler.x_scale = scale; 606 metrics->root.scaler.x_delta = delta; 607 } 608 else 609 { 610 metrics->root.scaler.y_scale = scale; 611 metrics->root.scaler.y_delta = delta; 612 } 613 614 /* scale the standard widths */ 615 for ( nn = 0; nn < axis->width_count; nn++ ) 616 { 617 AF_Width width = axis->widths + nn; 618 619 620 width->cur = FT_MulFix( width->org, scale ); 621 width->fit = width->cur; 622 } 623 624 /* an extra-light axis corresponds to a standard width that is */ 625 /* smaller than 5/8 pixels */ 626 axis->extra_light = 627 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 ); 628 629 if ( dim == AF_DIMENSION_VERT ) 630 { 631 /* scale the blue zones */ 632 for ( nn = 0; nn < axis->blue_count; nn++ ) 633 { 634 AF_LatinBlue blue = &axis->blues[nn]; 635 FT_Pos dist; 636 637 638 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 639 blue->ref.fit = blue->ref.cur; 640 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 641 blue->shoot.fit = blue->shoot.cur; 642 blue->flags &= ~AF_LATIN_BLUE_ACTIVE; 643 644 /* a blue zone is only active if it is less than 3/4 pixels tall */ 645 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 646 if ( dist <= 48 && dist >= -48 ) 647 { 648 FT_Pos delta1, delta2; 649 650 delta1 = blue->shoot.org - blue->ref.org; 651 delta2 = delta1; 652 if ( delta1 < 0 ) 653 delta2 = -delta2; 654 655 delta2 = FT_MulFix( delta2, scale ); 656 657 if ( delta2 < 32 ) 658 delta2 = 0; 659 else if ( delta2 < 64 ) 660 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 661 else 662 delta2 = FT_PIX_ROUND( delta2 ); 663 664 if ( delta1 < 0 ) 665 delta2 = -delta2; 666 667 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 668 blue->shoot.fit = blue->ref.fit + delta2; 669 670 FT_TRACE5(( ">> activating blue zone %d:" 671 " ref.cur=%.2g ref.fit=%.2g" 672 " shoot.cur=%.2g shoot.fit=%.2g\n", 673 nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0, 674 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 )); 675 676 blue->flags |= AF_LATIN_BLUE_ACTIVE; 677 } 678 } 679 } 680 } 681 682 683 FT_LOCAL_DEF( void ) 684 af_latin2_metrics_scale( AF_LatinMetrics metrics, 685 AF_Scaler scaler ) 686 { 687 metrics->root.scaler.render_mode = scaler->render_mode; 688 metrics->root.scaler.face = scaler->face; 689 metrics->root.scaler.flags = scaler->flags; 690 691 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 692 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 693 } 694 695 696 /*************************************************************************/ 697 /*************************************************************************/ 698 /***** *****/ 699 /***** L A T I N G L Y P H A N A L Y S I S *****/ 700 /***** *****/ 701 /*************************************************************************/ 702 /*************************************************************************/ 703 704#define SORT_SEGMENTS 705 706 FT_LOCAL_DEF( FT_Error ) 707 af_latin2_hints_compute_segments( AF_GlyphHints hints, 708 AF_Dimension dim ) 709 { 710 AF_AxisHints axis = &hints->axis[dim]; 711 FT_Memory memory = hints->memory; 712 FT_Error error = FT_Err_Ok; 713 AF_Segment segment = NULL; 714 AF_SegmentRec seg0; 715 AF_Point* contour = hints->contours; 716 AF_Point* contour_limit = contour + hints->num_contours; 717 AF_Direction major_dir, segment_dir; 718 719 720 FT_ZERO( &seg0 ); 721 seg0.score = 32000; 722 seg0.flags = AF_EDGE_NORMAL; 723 724 major_dir = (AF_Direction)FT_ABS( axis->major_dir ); 725 segment_dir = major_dir; 726 727 axis->num_segments = 0; 728 729 /* set up (u,v) in each point */ 730 if ( dim == AF_DIMENSION_HORZ ) 731 { 732 AF_Point point = hints->points; 733 AF_Point limit = point + hints->num_points; 734 735 736 for ( ; point < limit; point++ ) 737 { 738 point->u = point->fx; 739 point->v = point->fy; 740 } 741 } 742 else 743 { 744 AF_Point point = hints->points; 745 AF_Point limit = point + hints->num_points; 746 747 748 for ( ; point < limit; point++ ) 749 { 750 point->u = point->fy; 751 point->v = point->fx; 752 } 753 } 754 755 /* do each contour separately */ 756 for ( ; contour < contour_limit; contour++ ) 757 { 758 AF_Point point = contour[0]; 759 AF_Point start = point; 760 AF_Point last = point->prev; 761 762 763 if ( point == last ) /* skip singletons -- just in case */ 764 continue; 765 766 /* already on an edge ?, backtrack to find its start */ 767 if ( FT_ABS( point->in_dir ) == major_dir ) 768 { 769 point = point->prev; 770 771 while ( point->in_dir == start->in_dir ) 772 point = point->prev; 773 } 774 else /* otherwise, find first segment start, if any */ 775 { 776 while ( FT_ABS( point->out_dir ) != major_dir ) 777 { 778 point = point->next; 779 780 if ( point == start ) 781 goto NextContour; 782 } 783 } 784 785 start = point; 786 787 for (;;) 788 { 789 AF_Point first; 790 FT_Pos min_u, min_v, max_u, max_v; 791 792 /* we're at the start of a new segment */ 793 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir && 794 point->in_dir != point->out_dir ); 795 first = point; 796 797 min_u = max_u = point->u; 798 min_v = max_v = point->v; 799 800 point = point->next; 801 802 while ( point->out_dir == first->out_dir ) 803 { 804 point = point->next; 805 806 if ( point->u < min_u ) 807 min_u = point->u; 808 809 if ( point->u > max_u ) 810 max_u = point->u; 811 } 812 813 if ( point->v < min_v ) 814 min_v = point->v; 815 816 if ( point->v > max_v ) 817 max_v = point->v; 818 819 /* record new segment */ 820 error = af_axis_hints_new_segment( axis, memory, &segment ); 821 if ( error ) 822 goto Exit; 823 824 segment[0] = seg0; 825 segment->dir = first->out_dir; 826 segment->first = first; 827 segment->last = point; 828 segment->pos = (FT_Short)( ( min_u + max_u ) >> 1 ); 829 segment->min_coord = (FT_Short) min_v; 830 segment->max_coord = (FT_Short) max_v; 831 segment->height = (FT_Short)( max_v - min_v ); 832 833 /* a segment is round if it doesn't have successive */ 834 /* on-curve points. */ 835 { 836 AF_Point pt = first; 837 AF_Point last = point; 838 AF_Flags f0 = (AF_Flags)( pt->flags & AF_FLAG_CONTROL ); 839 AF_Flags f1; 840 841 842 segment->flags &= ~AF_EDGE_ROUND; 843 844 for ( ; pt != last; f0 = f1 ) 845 { 846 pt = pt->next; 847 f1 = (AF_Flags)( pt->flags & AF_FLAG_CONTROL ); 848 849 if ( !f0 && !f1 ) 850 break; 851 852 if ( pt == last ) 853 segment->flags |= AF_EDGE_ROUND; 854 } 855 } 856 857 /* this can happen in the case of a degenerate contour 858 * e.g. a 2-point vertical contour 859 */ 860 if ( point == start ) 861 break; 862 863 /* jump to the start of the next segment, if any */ 864 while ( FT_ABS( point->out_dir ) != major_dir ) 865 { 866 point = point->next; 867 868 if ( point == start ) 869 goto NextContour; 870 } 871 } 872 873 NextContour: 874 ; 875 } /* contours */ 876 877 /* now slightly increase the height of segments when this makes */ 878 /* sense -- this is used to better detect and ignore serifs */ 879 { 880 AF_Segment segments = axis->segments; 881 AF_Segment segments_end = segments + axis->num_segments; 882 883 884 for ( segment = segments; segment < segments_end; segment++ ) 885 { 886 AF_Point first = segment->first; 887 AF_Point last = segment->last; 888 AF_Point p; 889 FT_Pos first_v = first->v; 890 FT_Pos last_v = last->v; 891 892 893 if ( first == last ) 894 continue; 895 896 if ( first_v < last_v ) 897 { 898 p = first->prev; 899 if ( p->v < first_v ) 900 segment->height = (FT_Short)( segment->height + 901 ( ( first_v - p->v ) >> 1 ) ); 902 903 p = last->next; 904 if ( p->v > last_v ) 905 segment->height = (FT_Short)( segment->height + 906 ( ( p->v - last_v ) >> 1 ) ); 907 } 908 else 909 { 910 p = first->prev; 911 if ( p->v > first_v ) 912 segment->height = (FT_Short)( segment->height + 913 ( ( p->v - first_v ) >> 1 ) ); 914 915 p = last->next; 916 if ( p->v < last_v ) 917 segment->height = (FT_Short)( segment->height + 918 ( ( last_v - p->v ) >> 1 ) ); 919 } 920 } 921 } 922 923#ifdef AF_SORT_SEGMENTS 924 /* place all segments with a negative direction to the start 925 * of the array, used to speed up segment linking later... 926 */ 927 { 928 AF_Segment segments = axis->segments; 929 FT_UInt count = axis->num_segments; 930 FT_UInt ii, jj; 931 932 for ( ii = 0; ii < count; ii++ ) 933 { 934 if ( segments[ii].dir > 0 ) 935 { 936 for ( jj = ii + 1; jj < count; jj++ ) 937 { 938 if ( segments[jj].dir < 0 ) 939 { 940 AF_SegmentRec tmp; 941 942 943 tmp = segments[ii]; 944 segments[ii] = segments[jj]; 945 segments[jj] = tmp; 946 947 break; 948 } 949 } 950 951 if ( jj == count ) 952 break; 953 } 954 } 955 axis->mid_segments = ii; 956 } 957#endif 958 959 Exit: 960 return error; 961 } 962 963 964 FT_LOCAL_DEF( void ) 965 af_latin2_hints_link_segments( AF_GlyphHints hints, 966 AF_Dimension dim ) 967 { 968 AF_AxisHints axis = &hints->axis[dim]; 969 AF_Segment segments = axis->segments; 970 AF_Segment segment_limit = segments + axis->num_segments; 971#ifdef AF_SORT_SEGMENTS 972 AF_Segment segment_mid = segments + axis->mid_segments; 973#endif 974 FT_Pos len_threshold, len_score; 975 AF_Segment seg1, seg2; 976 977 978 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 979 if ( len_threshold == 0 ) 980 len_threshold = 1; 981 982 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 ); 983 984#ifdef AF_SORT_SEGMENTS 985 for ( seg1 = segments; seg1 < segment_mid; seg1++ ) 986 { 987 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last ) 988 continue; 989 990 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ ) 991#else 992 /* now compare each segment to the others */ 993 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 994 { 995 /* the fake segments are introduced to hint the metrics -- */ 996 /* we must never link them to anything */ 997 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last ) 998 continue; 999 1000 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 1001 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos ) 1002#endif 1003 { 1004 FT_Pos pos1 = seg1->pos; 1005 FT_Pos pos2 = seg2->pos; 1006 FT_Pos dist = pos2 - pos1; 1007 1008 1009 if ( dist < 0 ) 1010 continue; 1011 1012 { 1013 FT_Pos min = seg1->min_coord; 1014 FT_Pos max = seg1->max_coord; 1015 FT_Pos len, score; 1016 1017 1018 if ( min < seg2->min_coord ) 1019 min = seg2->min_coord; 1020 1021 if ( max > seg2->max_coord ) 1022 max = seg2->max_coord; 1023 1024 len = max - min; 1025 if ( len >= len_threshold ) 1026 { 1027 score = dist + len_score / len; 1028 if ( score < seg1->score ) 1029 { 1030 seg1->score = score; 1031 seg1->link = seg2; 1032 } 1033 1034 if ( score < seg2->score ) 1035 { 1036 seg2->score = score; 1037 seg2->link = seg1; 1038 } 1039 } 1040 } 1041 } 1042 } 1043#if 0 1044 } 1045#endif 1046 1047 /* now, compute the `serif' segments */ 1048 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1049 { 1050 seg2 = seg1->link; 1051 1052 if ( seg2 ) 1053 { 1054 if ( seg2->link != seg1 ) 1055 { 1056 seg1->link = 0; 1057 seg1->serif = seg2->link; 1058 } 1059 } 1060 } 1061 } 1062 1063 1064 FT_LOCAL_DEF( FT_Error ) 1065 af_latin2_hints_compute_edges( AF_GlyphHints hints, 1066 AF_Dimension dim ) 1067 { 1068 AF_AxisHints axis = &hints->axis[dim]; 1069 FT_Error error = FT_Err_Ok; 1070 FT_Memory memory = hints->memory; 1071 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim]; 1072 1073 AF_Segment segments = axis->segments; 1074 AF_Segment segment_limit = segments + axis->num_segments; 1075 AF_Segment seg; 1076 1077 AF_Direction up_dir; 1078 FT_Fixed scale; 1079 FT_Pos edge_distance_threshold; 1080 FT_Pos segment_length_threshold; 1081 1082 1083 axis->num_edges = 0; 1084 1085 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 1086 : hints->y_scale; 1087 1088 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP 1089 : AF_DIR_RIGHT; 1090 1091 /* 1092 * We want to ignore very small (mostly serif) segments, we do that 1093 * by ignoring those that whose length is less than a given fraction 1094 * of the standard width. If there is no standard width, we ignore 1095 * those that are less than a given size in pixels 1096 * 1097 * also, unlink serif segments that are linked to segments farther 1098 * than 50% of the standard width 1099 */ 1100 if ( dim == AF_DIMENSION_HORZ ) 1101 { 1102 if ( laxis->width_count > 0 ) 1103 segment_length_threshold = ( laxis->standard_width * 10 ) >> 4; 1104 else 1105 segment_length_threshold = FT_DivFix( 64, hints->y_scale ); 1106 } 1107 else 1108 segment_length_threshold = 0; 1109 1110 /*********************************************************************/ 1111 /* */ 1112 /* We will begin by generating a sorted table of edges for the */ 1113 /* current direction. To do so, we simply scan each segment and try */ 1114 /* to find an edge in our table that corresponds to its position. */ 1115 /* */ 1116 /* If no edge is found, we create and insert a new edge in the */ 1117 /* sorted table. Otherwise, we simply add the segment to the edge's */ 1118 /* list which will be processed in the second step to compute the */ 1119 /* edge's properties. */ 1120 /* */ 1121 /* Note that the edges table is sorted along the segment/edge */ 1122 /* position. */ 1123 /* */ 1124 /*********************************************************************/ 1125 1126 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1127 scale ); 1128 if ( edge_distance_threshold > 64 / 4 ) 1129 edge_distance_threshold = 64 / 4; 1130 1131 edge_distance_threshold = FT_DivFix( edge_distance_threshold, 1132 scale ); 1133 1134 for ( seg = segments; seg < segment_limit; seg++ ) 1135 { 1136 AF_Edge found = 0; 1137 FT_Int ee; 1138 1139 1140 if ( seg->height < segment_length_threshold ) 1141 continue; 1142 1143 /* A special case for serif edges: If they are smaller than */ 1144 /* 1.5 pixels we ignore them. */ 1145 if ( seg->serif ) 1146 { 1147 FT_Pos dist = seg->serif->pos - seg->pos; 1148 1149 1150 if ( dist < 0 ) 1151 dist = -dist; 1152 1153 if ( dist >= laxis->standard_width >> 1 ) 1154 { 1155 /* unlink this serif, it is too distant from its reference stem */ 1156 seg->serif = NULL; 1157 } 1158 else if ( 2*seg->height < 3 * segment_length_threshold ) 1159 continue; 1160 } 1161 1162 /* look for an edge corresponding to the segment */ 1163 for ( ee = 0; ee < axis->num_edges; ee++ ) 1164 { 1165 AF_Edge edge = axis->edges + ee; 1166 FT_Pos dist; 1167 1168 1169 dist = seg->pos - edge->fpos; 1170 if ( dist < 0 ) 1171 dist = -dist; 1172 1173 if ( dist < edge_distance_threshold && edge->dir == seg->dir ) 1174 { 1175 found = edge; 1176 break; 1177 } 1178 } 1179 1180 if ( !found ) 1181 { 1182 AF_Edge edge; 1183 1184 1185 /* insert a new edge in the list and */ 1186 /* sort according to the position */ 1187 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, 1188 memory, &edge ); 1189 if ( error ) 1190 goto Exit; 1191 1192 /* add the segment to the new edge's list */ 1193 FT_ZERO( edge ); 1194 1195 edge->first = seg; 1196 edge->last = seg; 1197 edge->fpos = seg->pos; 1198 edge->dir = seg->dir; 1199 edge->opos = edge->pos = FT_MulFix( seg->pos, scale ); 1200 seg->edge_next = seg; 1201 } 1202 else 1203 { 1204 /* if an edge was found, simply add the segment to the edge's */ 1205 /* list */ 1206 seg->edge_next = found->first; 1207 found->last->edge_next = seg; 1208 found->last = seg; 1209 } 1210 } 1211 1212 1213 /*********************************************************************/ 1214 /* */ 1215 /* Good, we will now compute each edge's properties according to */ 1216 /* segments found on its position. Basically, these are: */ 1217 /* */ 1218 /* - edge's main direction */ 1219 /* - stem edge, serif edge or both (which defaults to stem then) */ 1220 /* - rounded edge, straight or both (which defaults to straight) */ 1221 /* - link for edge */ 1222 /* */ 1223 /*********************************************************************/ 1224 1225 /* first of all, set the `edge' field in each segment -- this is */ 1226 /* required in order to compute edge links */ 1227 1228 /* 1229 * Note that removing this loop and setting the `edge' field of each 1230 * segment directly in the code above slows down execution speed for 1231 * some reasons on platforms like the Sun. 1232 */ 1233 { 1234 AF_Edge edges = axis->edges; 1235 AF_Edge edge_limit = edges + axis->num_edges; 1236 AF_Edge edge; 1237 1238 1239 for ( edge = edges; edge < edge_limit; edge++ ) 1240 { 1241 seg = edge->first; 1242 if ( seg ) 1243 do 1244 { 1245 seg->edge = edge; 1246 seg = seg->edge_next; 1247 1248 } while ( seg != edge->first ); 1249 } 1250 1251 /* now, compute each edge properties */ 1252 for ( edge = edges; edge < edge_limit; edge++ ) 1253 { 1254 FT_Int is_round = 0; /* does it contain round segments? */ 1255 FT_Int is_straight = 0; /* does it contain straight segments? */ 1256#if 0 1257 FT_Pos ups = 0; /* number of upwards segments */ 1258 FT_Pos downs = 0; /* number of downwards segments */ 1259#endif 1260 1261 1262 seg = edge->first; 1263 1264 do 1265 { 1266 FT_Bool is_serif; 1267 1268 1269 /* check for roundness of segment */ 1270 if ( seg->flags & AF_EDGE_ROUND ) 1271 is_round++; 1272 else 1273 is_straight++; 1274 1275#if 0 1276 /* check for segment direction */ 1277 if ( seg->dir == up_dir ) 1278 ups += seg->max_coord-seg->min_coord; 1279 else 1280 downs += seg->max_coord-seg->min_coord; 1281#endif 1282 1283 /* check for links -- if seg->serif is set, then seg->link must */ 1284 /* be ignored */ 1285 is_serif = (FT_Bool)( seg->serif && 1286 seg->serif->edge && 1287 seg->serif->edge != edge ); 1288 1289 if ( ( seg->link && seg->link->edge != NULL ) || is_serif ) 1290 { 1291 AF_Edge edge2; 1292 AF_Segment seg2; 1293 1294 1295 edge2 = edge->link; 1296 seg2 = seg->link; 1297 1298 if ( is_serif ) 1299 { 1300 seg2 = seg->serif; 1301 edge2 = edge->serif; 1302 } 1303 1304 if ( edge2 ) 1305 { 1306 FT_Pos edge_delta; 1307 FT_Pos seg_delta; 1308 1309 1310 edge_delta = edge->fpos - edge2->fpos; 1311 if ( edge_delta < 0 ) 1312 edge_delta = -edge_delta; 1313 1314 seg_delta = seg->pos - seg2->pos; 1315 if ( seg_delta < 0 ) 1316 seg_delta = -seg_delta; 1317 1318 if ( seg_delta < edge_delta ) 1319 edge2 = seg2->edge; 1320 } 1321 else 1322 edge2 = seg2->edge; 1323 1324 if ( is_serif ) 1325 { 1326 edge->serif = edge2; 1327 edge2->flags |= AF_EDGE_SERIF; 1328 } 1329 else 1330 edge->link = edge2; 1331 } 1332 1333 seg = seg->edge_next; 1334 1335 } while ( seg != edge->first ); 1336 1337 /* set the round/straight flags */ 1338 edge->flags = AF_EDGE_NORMAL; 1339 1340 if ( is_round > 0 && is_round >= is_straight ) 1341 edge->flags |= AF_EDGE_ROUND; 1342 1343#if 0 1344 /* set the edge's main direction */ 1345 edge->dir = AF_DIR_NONE; 1346 1347 if ( ups > downs ) 1348 edge->dir = (FT_Char)up_dir; 1349 1350 else if ( ups < downs ) 1351 edge->dir = (FT_Char)-up_dir; 1352 1353 else if ( ups == downs ) 1354 edge->dir = 0; /* both up and down! */ 1355#endif 1356 1357 /* gets rid of serifs if link is set */ 1358 /* XXX: This gets rid of many unpleasant artefacts! */ 1359 /* Example: the `c' in cour.pfa at size 13 */ 1360 1361 if ( edge->serif && edge->link ) 1362 edge->serif = 0; 1363 } 1364 } 1365 1366 Exit: 1367 return error; 1368 } 1369 1370 1371 FT_LOCAL_DEF( FT_Error ) 1372 af_latin2_hints_detect_features( AF_GlyphHints hints, 1373 AF_Dimension dim ) 1374 { 1375 FT_Error error; 1376 1377 1378 error = af_latin2_hints_compute_segments( hints, dim ); 1379 if ( !error ) 1380 { 1381 af_latin2_hints_link_segments( hints, dim ); 1382 1383 error = af_latin2_hints_compute_edges( hints, dim ); 1384 } 1385 return error; 1386 } 1387 1388 1389 FT_LOCAL_DEF( void ) 1390 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints, 1391 AF_LatinMetrics metrics ) 1392 { 1393 AF_AxisHints axis = &hints->axis[AF_DIMENSION_VERT]; 1394 AF_Edge edge = axis->edges; 1395 AF_Edge edge_limit = edge + axis->num_edges; 1396 AF_LatinAxis latin = &metrics->axis[AF_DIMENSION_VERT]; 1397 FT_Fixed scale = latin->scale; 1398 FT_Pos best_dist0; /* initial threshold */ 1399 1400 1401 /* compute the initial threshold as a fraction of the EM size */ 1402 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1403 1404 if ( best_dist0 > 64 / 2 ) 1405 best_dist0 = 64 / 2; 1406 1407 /* compute which blue zones are active, i.e. have their scaled */ 1408 /* size < 3/4 pixels */ 1409 1410 /* for each horizontal edge search the blue zone which is closest */ 1411 for ( ; edge < edge_limit; edge++ ) 1412 { 1413 FT_Int bb; 1414 AF_Width best_blue = NULL; 1415 FT_Pos best_dist = best_dist0; 1416 1417 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 1418 { 1419 AF_LatinBlue blue = latin->blues + bb; 1420 FT_Bool is_top_blue, is_major_dir; 1421 1422 1423 /* skip inactive blue zones (i.e., those that are too small) */ 1424 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) ) 1425 continue; 1426 1427 /* if it is a top zone, check for right edges -- if it is a bottom */ 1428 /* zone, check for left edges */ 1429 /* */ 1430 /* of course, that's for TrueType */ 1431 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 ); 1432 is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); 1433 1434 /* if it is a top zone, the edge must be against the major */ 1435 /* direction; if it is a bottom zone, it must be in the major */ 1436 /* direction */ 1437 if ( is_top_blue ^ is_major_dir ) 1438 { 1439 FT_Pos dist; 1440 AF_Width compare; 1441 1442 1443 /* if it's a rounded edge, compare it to the overshoot position */ 1444 /* if it's a flat edge, compare it to the reference position */ 1445 if ( edge->flags & AF_EDGE_ROUND ) 1446 compare = &blue->shoot; 1447 else 1448 compare = &blue->ref; 1449 1450 dist = edge->fpos - compare->org; 1451 if ( dist < 0 ) 1452 dist = -dist; 1453 1454 dist = FT_MulFix( dist, scale ); 1455 if ( dist < best_dist ) 1456 { 1457 best_dist = dist; 1458 best_blue = compare; 1459 } 1460 1461#if 0 1462 /* now, compare it to the overshoot position if the edge is */ 1463 /* rounded, and if the edge is over the reference position of a */ 1464 /* top zone, or under the reference position of a bottom zone */ 1465 if ( edge->flags & AF_EDGE_ROUND && dist != 0 ) 1466 { 1467 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org ); 1468 1469 1470 if ( is_top_blue ^ is_under_ref ) 1471 { 1472 blue = latin->blues + bb; 1473 dist = edge->fpos - blue->shoot.org; 1474 if ( dist < 0 ) 1475 dist = -dist; 1476 1477 dist = FT_MulFix( dist, scale ); 1478 if ( dist < best_dist ) 1479 { 1480 best_dist = dist; 1481 best_blue = & blue->shoot; 1482 } 1483 } 1484 } 1485#endif 1486 } 1487 } 1488 1489 if ( best_blue ) 1490 edge->blue_edge = best_blue; 1491 } 1492 } 1493 1494 1495 static FT_Error 1496 af_latin2_hints_init( AF_GlyphHints hints, 1497 AF_LatinMetrics metrics ) 1498 { 1499 FT_Render_Mode mode; 1500 FT_UInt32 scaler_flags, other_flags; 1501 FT_Face face = metrics->root.scaler.face; 1502 1503 1504 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics ); 1505 1506 /* 1507 * correct x_scale and y_scale if needed, since they may have 1508 * been modified `af_latin2_metrics_scale_dim' above 1509 */ 1510 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1511 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1512 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1513 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1514 1515 /* compute flags depending on render mode, etc. */ 1516 mode = metrics->root.scaler.render_mode; 1517 1518#if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */ 1519 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1520 { 1521 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1522 } 1523#endif 1524 1525 scaler_flags = hints->scaler_flags; 1526 other_flags = 0; 1527 1528 /* 1529 * We snap the width of vertical stems for the monochrome and 1530 * horizontal LCD rendering targets only. 1531 */ 1532 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1533 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1534 1535 /* 1536 * We snap the width of horizontal stems for the monochrome and 1537 * vertical LCD rendering targets only. 1538 */ 1539 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1540 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1541 1542 /* 1543 * We adjust stems to full pixels only if we don't use the `light' mode. 1544 */ 1545 if ( mode != FT_RENDER_MODE_LIGHT ) 1546 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1547 1548 if ( mode == FT_RENDER_MODE_MONO ) 1549 other_flags |= AF_LATIN_HINTS_MONO; 1550 1551 /* 1552 * In `light' hinting mode we disable horizontal hinting completely. 1553 * We also do it if the face is italic. 1554 */ 1555 if ( mode == FT_RENDER_MODE_LIGHT || 1556 ( face->style_flags & FT_STYLE_FLAG_ITALIC ) != 0 ) 1557 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL; 1558 1559 hints->scaler_flags = scaler_flags; 1560 hints->other_flags = other_flags; 1561 1562 return 0; 1563 } 1564 1565 1566 /*************************************************************************/ 1567 /*************************************************************************/ 1568 /***** *****/ 1569 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/ 1570 /***** *****/ 1571 /*************************************************************************/ 1572 /*************************************************************************/ 1573 1574 /* snap a given width in scaled coordinates to one of the */ 1575 /* current standard widths */ 1576 1577 static FT_Pos 1578 af_latin2_snap_width( AF_Width widths, 1579 FT_Int count, 1580 FT_Pos width ) 1581 { 1582 int n; 1583 FT_Pos best = 64 + 32 + 2; 1584 FT_Pos reference = width; 1585 FT_Pos scaled; 1586 1587 1588 for ( n = 0; n < count; n++ ) 1589 { 1590 FT_Pos w; 1591 FT_Pos dist; 1592 1593 1594 w = widths[n].cur; 1595 dist = width - w; 1596 if ( dist < 0 ) 1597 dist = -dist; 1598 if ( dist < best ) 1599 { 1600 best = dist; 1601 reference = w; 1602 } 1603 } 1604 1605 scaled = FT_PIX_ROUND( reference ); 1606 1607 if ( width >= reference ) 1608 { 1609 if ( width < scaled + 48 ) 1610 width = reference; 1611 } 1612 else 1613 { 1614 if ( width > scaled - 48 ) 1615 width = reference; 1616 } 1617 1618 return width; 1619 } 1620 1621 1622 /* compute the snapped width of a given stem */ 1623 1624 static FT_Pos 1625 af_latin2_compute_stem_width( AF_GlyphHints hints, 1626 AF_Dimension dim, 1627 FT_Pos width, 1628 AF_Edge_Flags base_flags, 1629 AF_Edge_Flags stem_flags ) 1630 { 1631 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics; 1632 AF_LatinAxis axis = & metrics->axis[dim]; 1633 FT_Pos dist = width; 1634 FT_Int sign = 0; 1635 FT_Int vertical = ( dim == AF_DIMENSION_VERT ); 1636 1637 FT_UNUSED( base_flags ); 1638 1639 1640 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) || 1641 axis->extra_light ) 1642 return width; 1643 1644 if ( dist < 0 ) 1645 { 1646 dist = -width; 1647 sign = 1; 1648 } 1649 1650 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1651 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1652 { 1653 /* smooth hinting process: very lightly quantize the stem width */ 1654 1655 /* leave the widths of serifs alone */ 1656 1657 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) ) 1658 goto Done_Width; 1659 1660#if 0 1661 else if ( ( base_flags & AF_EDGE_ROUND ) ) 1662 { 1663 if ( dist < 80 ) 1664 dist = 64; 1665 } 1666 else if ( dist < 56 ) 1667 dist = 56; 1668#endif 1669 if ( axis->width_count > 0 ) 1670 { 1671 FT_Pos delta; 1672 1673 1674 /* compare to standard width */ 1675 if ( axis->width_count > 0 ) 1676 { 1677 delta = dist - axis->widths[0].cur; 1678 1679 if ( delta < 0 ) 1680 delta = -delta; 1681 1682 if ( delta < 40 ) 1683 { 1684 dist = axis->widths[0].cur; 1685 if ( dist < 48 ) 1686 dist = 48; 1687 1688 goto Done_Width; 1689 } 1690 } 1691 1692 if ( dist < 3 * 64 ) 1693 { 1694 delta = dist & 63; 1695 dist &= -64; 1696 1697 if ( delta < 10 ) 1698 dist += delta; 1699 1700 else if ( delta < 32 ) 1701 dist += 10; 1702 1703 else if ( delta < 54 ) 1704 dist += 54; 1705 1706 else 1707 dist += delta; 1708 } 1709 else 1710 dist = ( dist + 32 ) & ~63; 1711 } 1712 } 1713 else 1714 { 1715 /* strong hinting process: snap the stem width to integer pixels */ 1716 FT_Pos org_dist = dist; 1717 1718 1719 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist ); 1720 1721 if ( vertical ) 1722 { 1723 /* in the case of vertical hinting, always round */ 1724 /* the stem heights to integer pixels */ 1725 1726 if ( dist >= 64 ) 1727 dist = ( dist + 16 ) & ~63; 1728 else 1729 dist = 64; 1730 } 1731 else 1732 { 1733 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1734 { 1735 /* monochrome horizontal hinting: snap widths to integer pixels */ 1736 /* with a different threshold */ 1737 1738 if ( dist < 64 ) 1739 dist = 64; 1740 else 1741 dist = ( dist + 32 ) & ~63; 1742 } 1743 else 1744 { 1745 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1746 /* approach: we strengthen small stems, round stems whose size */ 1747 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1748 1749 if ( dist < 48 ) 1750 dist = ( dist + 64 ) >> 1; 1751 1752 else if ( dist < 128 ) 1753 { 1754 /* We only round to an integer width if the corresponding */ 1755 /* distortion is less than 1/4 pixel. Otherwise this */ 1756 /* makes everything worse since the diagonals, which are */ 1757 /* not hinted, appear a lot bolder or thinner than the */ 1758 /* vertical stems. */ 1759 1760 FT_Int delta; 1761 1762 1763 dist = ( dist + 22 ) & ~63; 1764 delta = dist - org_dist; 1765 if ( delta < 0 ) 1766 delta = -delta; 1767 1768 if ( delta >= 16 ) 1769 { 1770 dist = org_dist; 1771 if ( dist < 48 ) 1772 dist = ( dist + 64 ) >> 1; 1773 } 1774 } 1775 else 1776 /* round otherwise to prevent color fringes in LCD mode */ 1777 dist = ( dist + 32 ) & ~63; 1778 } 1779 } 1780 } 1781 1782 Done_Width: 1783 if ( sign ) 1784 dist = -dist; 1785 1786 return dist; 1787 } 1788 1789 1790 /* align one stem edge relative to the previous stem edge */ 1791 1792 static void 1793 af_latin2_align_linked_edge( AF_GlyphHints hints, 1794 AF_Dimension dim, 1795 AF_Edge base_edge, 1796 AF_Edge stem_edge ) 1797 { 1798 FT_Pos dist = stem_edge->opos - base_edge->opos; 1799 1800 FT_Pos fitted_width = af_latin2_compute_stem_width( 1801 hints, dim, dist, 1802 (AF_Edge_Flags)base_edge->flags, 1803 (AF_Edge_Flags)stem_edge->flags ); 1804 1805 1806 stem_edge->pos = base_edge->pos + fitted_width; 1807 1808 FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), " 1809 "dist was %.2f, now %.2f\n", 1810 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0, 1811 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 )); 1812 } 1813 1814 1815 static void 1816 af_latin2_align_serif_edge( AF_GlyphHints hints, 1817 AF_Edge base, 1818 AF_Edge serif ) 1819 { 1820 FT_UNUSED( hints ); 1821 1822 serif->pos = base->pos + ( serif->opos - base->opos ); 1823 } 1824 1825 1826 /*************************************************************************/ 1827 /*************************************************************************/ 1828 /*************************************************************************/ 1829 /**** ****/ 1830 /**** E D G E H I N T I N G ****/ 1831 /**** ****/ 1832 /*************************************************************************/ 1833 /*************************************************************************/ 1834 /*************************************************************************/ 1835 1836 1837 FT_LOCAL_DEF( void ) 1838 af_latin2_hint_edges( AF_GlyphHints hints, 1839 AF_Dimension dim ) 1840 { 1841 AF_AxisHints axis = &hints->axis[dim]; 1842 AF_Edge edges = axis->edges; 1843 AF_Edge edge_limit = edges + axis->num_edges; 1844 AF_Edge edge; 1845 AF_Edge anchor = 0; 1846 FT_Int has_serifs = 0; 1847 FT_Pos anchor_drift = 0; 1848 1849 1850 1851 FT_TRACE5(( "==== hinting %s edges =====\n", 1852 dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" )); 1853 1854 /* we begin by aligning all stems relative to the blue zone */ 1855 /* if needed -- that's only for horizontal edges */ 1856 1857 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) ) 1858 { 1859 for ( edge = edges; edge < edge_limit; edge++ ) 1860 { 1861 AF_Width blue; 1862 AF_Edge edge1, edge2; 1863 1864 1865 if ( edge->flags & AF_EDGE_DONE ) 1866 continue; 1867 1868 blue = edge->blue_edge; 1869 edge1 = NULL; 1870 edge2 = edge->link; 1871 1872 if ( blue ) 1873 { 1874 edge1 = edge; 1875 } 1876 else if ( edge2 && edge2->blue_edge ) 1877 { 1878 blue = edge2->blue_edge; 1879 edge1 = edge2; 1880 edge2 = edge; 1881 } 1882 1883 if ( !edge1 ) 1884 continue; 1885 1886 FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), " 1887 "was (%.2f)\n", 1888 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0, 1889 edge1->pos / 64.0 )); 1890 1891 edge1->pos = blue->fit; 1892 edge1->flags |= AF_EDGE_DONE; 1893 1894 if ( edge2 && !edge2->blue_edge ) 1895 { 1896 af_latin2_align_linked_edge( hints, dim, edge1, edge2 ); 1897 edge2->flags |= AF_EDGE_DONE; 1898 } 1899 1900 if ( !anchor ) 1901 { 1902 anchor = edge; 1903 1904 anchor_drift = ( anchor->pos - anchor->opos ); 1905 if ( edge2 ) 1906 anchor_drift = ( anchor_drift + 1907 ( edge2->pos - edge2->opos ) ) >> 1; 1908 } 1909 } 1910 } 1911 1912 /* now we will align all stem edges, trying to maintain the */ 1913 /* relative order of stems in the glyph */ 1914 for ( edge = edges; edge < edge_limit; edge++ ) 1915 { 1916 AF_Edge edge2; 1917 1918 1919 if ( edge->flags & AF_EDGE_DONE ) 1920 continue; 1921 1922 /* skip all non-stem edges */ 1923 edge2 = edge->link; 1924 if ( !edge2 ) 1925 { 1926 has_serifs++; 1927 continue; 1928 } 1929 1930 /* now align the stem */ 1931 1932 /* this should not happen, but it's better to be safe */ 1933 if ( edge2->blue_edge ) 1934 { 1935 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1936 1937 af_latin2_align_linked_edge( hints, dim, edge2, edge ); 1938 edge->flags |= AF_EDGE_DONE; 1939 continue; 1940 } 1941 1942 if ( !anchor ) 1943 { 1944 FT_Pos org_len, org_center, cur_len; 1945 FT_Pos cur_pos1, error1, error2, u_off, d_off; 1946 1947 1948 org_len = edge2->opos - edge->opos; 1949 cur_len = af_latin2_compute_stem_width( 1950 hints, dim, org_len, 1951 (AF_Edge_Flags)edge->flags, 1952 (AF_Edge_Flags)edge2->flags ); 1953 if ( cur_len <= 64 ) 1954 u_off = d_off = 32; 1955 else 1956 { 1957 u_off = 38; 1958 d_off = 26; 1959 } 1960 1961 if ( cur_len < 96 ) 1962 { 1963 org_center = edge->opos + ( org_len >> 1 ); 1964 1965 cur_pos1 = FT_PIX_ROUND( org_center ); 1966 1967 error1 = org_center - ( cur_pos1 - u_off ); 1968 if ( error1 < 0 ) 1969 error1 = -error1; 1970 1971 error2 = org_center - ( cur_pos1 + d_off ); 1972 if ( error2 < 0 ) 1973 error2 = -error2; 1974 1975 if ( error1 < error2 ) 1976 cur_pos1 -= u_off; 1977 else 1978 cur_pos1 += d_off; 1979 1980 edge->pos = cur_pos1 - cur_len / 2; 1981 edge2->pos = edge->pos + cur_len; 1982 } 1983 else 1984 edge->pos = FT_PIX_ROUND( edge->opos ); 1985 1986 FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)" 1987 " snapped to (%.2f) (%.2f)\n", 1988 edge-edges, edge->opos / 64.0, 1989 edge2-edges, edge2->opos / 64.0, 1990 edge->pos / 64.0, edge2->pos / 64.0 )); 1991 anchor = edge; 1992 1993 edge->flags |= AF_EDGE_DONE; 1994 1995 af_latin2_align_linked_edge( hints, dim, edge, edge2 ); 1996 1997 edge2->flags |= AF_EDGE_DONE; 1998 1999 anchor_drift = ( ( anchor->pos - anchor->opos ) + 2000 ( edge2->pos - edge2->opos ) ) >> 1; 2001 2002 FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 )); 2003 } 2004 else 2005 { 2006 FT_Pos org_pos, org_len, org_center, cur_center, cur_len; 2007 FT_Pos org_left, org_right; 2008 2009 2010 org_pos = edge->opos + anchor_drift; 2011 org_len = edge2->opos - edge->opos; 2012 org_center = org_pos + ( org_len >> 1 ); 2013 2014 cur_len = af_latin2_compute_stem_width( 2015 hints, dim, org_len, 2016 (AF_Edge_Flags)edge->flags, 2017 (AF_Edge_Flags)edge2->flags ); 2018 2019 org_left = org_pos + ( ( org_len - cur_len ) >> 1 ); 2020 org_right = org_pos + ( ( org_len + cur_len ) >> 1 ); 2021 2022 FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ", 2023 org_left / 64.0, org_right / 64.0 )); 2024 cur_center = org_center; 2025 2026 if ( edge2->flags & AF_EDGE_DONE ) 2027 { 2028 FT_TRACE5(( "\n" )); 2029 edge->pos = edge2->pos - cur_len; 2030 } 2031 else 2032 { 2033 /* we want to compare several displacement, and choose 2034 * the one that increases fitness while minimizing 2035 * distortion as well 2036 */ 2037 FT_Pos displacements[6], scores[6], org, fit, delta; 2038 FT_UInt count = 0; 2039 2040 /* note: don't even try to fit tiny stems */ 2041 if ( cur_len < 32 ) 2042 { 2043 FT_TRACE5(( "tiny stem\n" )); 2044 goto AlignStem; 2045 } 2046 2047 /* if the span is within a single pixel, don't touch it */ 2048 if ( FT_PIX_FLOOR( org_left ) == FT_PIX_CEIL( org_right ) ) 2049 { 2050 FT_TRACE5(( "single pixel stem\n" )); 2051 goto AlignStem; 2052 } 2053 2054 if ( cur_len <= 96 ) 2055 { 2056 /* we want to avoid the absolute worst case which is 2057 * when the left and right edges of the span each represent 2058 * about 50% of the gray. we'd better want to change this 2059 * to 25/75%, since this is much more pleasant to the eye with 2060 * very acceptable distortion 2061 */ 2062 FT_Pos frac_left = org_left & 63; 2063 FT_Pos frac_right = org_right & 63; 2064 2065 if ( frac_left >= 22 && frac_left <= 42 && 2066 frac_right >= 22 && frac_right <= 42 ) 2067 { 2068 org = frac_left; 2069 fit = ( org <= 32 ) ? 16 : 48; 2070 delta = FT_ABS( fit - org ); 2071 displacements[count] = fit - org; 2072 scores[count++] = delta; 2073 FT_TRACE5(( "dispA=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2074 2075 org = frac_right; 2076 fit = ( org <= 32 ) ? 16 : 48; 2077 delta = FT_ABS( fit - org ); 2078 displacements[count] = fit - org; 2079 scores[count++] = delta; 2080 FT_TRACE5(( "dispB=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2081 } 2082 } 2083 2084 /* snapping the left edge to the grid */ 2085 org = org_left; 2086 fit = FT_PIX_ROUND( org ); 2087 delta = FT_ABS( fit - org ); 2088 displacements[count] = fit - org; 2089 scores[count++] = delta; 2090 FT_TRACE5(( "dispC=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2091 2092 /* snapping the right edge to the grid */ 2093 org = org_right; 2094 fit = FT_PIX_ROUND( org ); 2095 delta = FT_ABS( fit - org ); 2096 displacements[count] = fit - org; 2097 scores[count++] = delta; 2098 FT_TRACE5(( "dispD=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2099 2100 /* now find the best displacement */ 2101 { 2102 FT_Pos best_score = scores[0]; 2103 FT_Pos best_disp = displacements[0]; 2104 FT_UInt nn; 2105 2106 for ( nn = 1; nn < count; nn++ ) 2107 { 2108 if ( scores[nn] < best_score ) 2109 { 2110 best_score = scores[nn]; 2111 best_disp = displacements[nn]; 2112 } 2113 } 2114 2115 cur_center = org_center + best_disp; 2116 } 2117 FT_TRACE5(( "\n" )); 2118 } 2119 2120 AlignStem: 2121 edge->pos = cur_center - ( cur_len >> 1 ); 2122 edge2->pos = edge->pos + cur_len; 2123 2124 FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)" 2125 " snapped to (%.2f) and (%.2f)," 2126 " org_len=%.2f cur_len=%.2f\n", 2127 edge-edges, edge->opos / 64.0, 2128 edge2-edges, edge2->opos / 64.0, 2129 edge->pos / 64.0, edge2->pos / 64.0, 2130 org_len / 64.0, cur_len / 64.0 )); 2131 2132 edge->flags |= AF_EDGE_DONE; 2133 edge2->flags |= AF_EDGE_DONE; 2134 2135 if ( edge > edges && edge->pos < edge[-1].pos ) 2136 { 2137 FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n", 2138 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 )); 2139 edge->pos = edge[-1].pos; 2140 } 2141 } 2142 } 2143 2144 /* make sure that lowercase m's maintain their symmetry */ 2145 2146 /* In general, lowercase m's have six vertical edges if they are sans */ 2147 /* serif, or twelve if they are with serifs. This implementation is */ 2148 /* based on that assumption, and seems to work very well with most */ 2149 /* faces. However, if for a certain face this assumption is not */ 2150 /* true, the m is just rendered like before. In addition, any stem */ 2151 /* correction will only be applied to symmetrical glyphs (even if the */ 2152 /* glyph is not an m), so the potential for unwanted distortion is */ 2153 /* relatively low. */ 2154 2155 /* We don't handle horizontal edges since we can't easily assure that */ 2156 /* the third (lowest) stem aligns with the base line; it might end up */ 2157 /* one pixel higher or lower. */ 2158 2159#if 0 2160 { 2161 FT_Int n_edges = edge_limit - edges; 2162 2163 2164 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 2165 { 2166 AF_Edge edge1, edge2, edge3; 2167 FT_Pos dist1, dist2, span, delta; 2168 2169 2170 if ( n_edges == 6 ) 2171 { 2172 edge1 = edges; 2173 edge2 = edges + 2; 2174 edge3 = edges + 4; 2175 } 2176 else 2177 { 2178 edge1 = edges + 1; 2179 edge2 = edges + 5; 2180 edge3 = edges + 9; 2181 } 2182 2183 dist1 = edge2->opos - edge1->opos; 2184 dist2 = edge3->opos - edge2->opos; 2185 2186 span = dist1 - dist2; 2187 if ( span < 0 ) 2188 span = -span; 2189 2190 if ( span < 8 ) 2191 { 2192 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2193 edge3->pos -= delta; 2194 if ( edge3->link ) 2195 edge3->link->pos -= delta; 2196 2197 /* move the serifs along with the stem */ 2198 if ( n_edges == 12 ) 2199 { 2200 ( edges + 8 )->pos -= delta; 2201 ( edges + 11 )->pos -= delta; 2202 } 2203 2204 edge3->flags |= AF_EDGE_DONE; 2205 if ( edge3->link ) 2206 edge3->link->flags |= AF_EDGE_DONE; 2207 } 2208 } 2209 } 2210#endif 2211 2212 if ( has_serifs || !anchor ) 2213 { 2214 /* 2215 * now hint the remaining edges (serifs and single) in order 2216 * to complete our processing 2217 */ 2218 for ( edge = edges; edge < edge_limit; edge++ ) 2219 { 2220 FT_Pos delta; 2221 2222 2223 if ( edge->flags & AF_EDGE_DONE ) 2224 continue; 2225 2226 delta = 1000; 2227 2228 if ( edge->serif ) 2229 { 2230 delta = edge->serif->opos - edge->opos; 2231 if ( delta < 0 ) 2232 delta = -delta; 2233 } 2234 2235 if ( delta < 64 + 16 ) 2236 { 2237 af_latin2_align_serif_edge( hints, edge->serif, edge ); 2238 FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)" 2239 " aligned to (%.2f)\n", 2240 edge-edges, edge->opos / 64.0, 2241 edge->serif - edges, edge->serif->opos / 64.0, 2242 edge->pos / 64.0 )); 2243 } 2244 else if ( !anchor ) 2245 { 2246 FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)" 2247 " snapped to (%.2f)\n", 2248 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2249 edge->pos = FT_PIX_ROUND( edge->opos ); 2250 anchor = edge; 2251 } 2252 else 2253 { 2254 AF_Edge before, after; 2255 2256 2257 for ( before = edge - 1; before >= edges; before-- ) 2258 if ( before->flags & AF_EDGE_DONE ) 2259 break; 2260 2261 for ( after = edge + 1; after < edge_limit; after++ ) 2262 if ( after->flags & AF_EDGE_DONE ) 2263 break; 2264 2265 if ( before >= edges && before < edge && 2266 after < edge_limit && after > edge ) 2267 { 2268 if ( after->opos == before->opos ) 2269 edge->pos = before->pos; 2270 else 2271 edge->pos = before->pos + 2272 FT_MulDiv( edge->opos - before->opos, 2273 after->pos - before->pos, 2274 after->opos - before->opos ); 2275 FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)" 2276 " from %d (opos=%.2f)\n", 2277 edge-edges, edge->opos / 64.0, edge->pos / 64.0, 2278 before - edges, before->opos / 64.0 )); 2279 } 2280 else 2281 { 2282 edge->pos = anchor->pos + 2283 ( ( edge->opos - anchor->opos + 16 ) & ~31 ); 2284 2285 FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)" 2286 " snapped to (%.2f)\n", 2287 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2288 } 2289 } 2290 2291 edge->flags |= AF_EDGE_DONE; 2292 2293 if ( edge > edges && edge->pos < edge[-1].pos ) 2294 edge->pos = edge[-1].pos; 2295 2296 if ( edge + 1 < edge_limit && 2297 edge[1].flags & AF_EDGE_DONE && 2298 edge->pos > edge[1].pos ) 2299 edge->pos = edge[1].pos; 2300 } 2301 } 2302 } 2303 2304 2305 static FT_Error 2306 af_latin2_hints_apply( AF_GlyphHints hints, 2307 FT_Outline* outline, 2308 AF_LatinMetrics metrics ) 2309 { 2310 FT_Error error; 2311 int dim; 2312 2313 2314 error = af_glyph_hints_reload( hints, outline ); 2315 if ( error ) 2316 goto Exit; 2317 2318 /* analyze glyph outline */ 2319#ifdef AF_CONFIG_OPTION_USE_WARPER 2320 if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT || 2321 AF_HINTS_DO_HORIZONTAL( hints ) ) 2322#else 2323 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2324#endif 2325 { 2326 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2327 if ( error ) 2328 goto Exit; 2329 } 2330 2331 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2332 { 2333 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT ); 2334 if ( error ) 2335 goto Exit; 2336 2337 af_latin2_hints_compute_blue_edges( hints, metrics ); 2338 } 2339 2340 /* grid-fit the outline */ 2341 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2342 { 2343#ifdef AF_CONFIG_OPTION_USE_WARPER 2344 if ( ( dim == AF_DIMENSION_HORZ && 2345 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) ) 2346 { 2347 AF_WarperRec warper; 2348 FT_Fixed scale; 2349 FT_Pos delta; 2350 2351 2352 af_warper_compute( &warper, hints, dim, &scale, &delta ); 2353 af_glyph_hints_scale_dim( hints, dim, scale, delta ); 2354 continue; 2355 } 2356#endif 2357 2358 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2359 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2360 { 2361 af_latin2_hint_edges( hints, (AF_Dimension)dim ); 2362 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim ); 2363 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2364 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2365 } 2366 } 2367 af_glyph_hints_save( hints, outline ); 2368 2369 Exit: 2370 return error; 2371 } 2372 2373 2374 /*************************************************************************/ 2375 /*************************************************************************/ 2376 /***** *****/ 2377 /***** L A T I N S C R I P T C L A S S *****/ 2378 /***** *****/ 2379 /*************************************************************************/ 2380 /*************************************************************************/ 2381 2382 2383 AF_DEFINE_WRITING_SYSTEM_CLASS( 2384 af_latin2_writing_system_class, 2385 2386 AF_WRITING_SYSTEM_LATIN2, 2387 2388 sizeof ( AF_LatinMetricsRec ), 2389 2390 (AF_WritingSystem_InitMetricsFunc) af_latin2_metrics_init, 2391 (AF_WritingSystem_ScaleMetricsFunc)af_latin2_metrics_scale, 2392 (AF_WritingSystem_DoneMetricsFunc) NULL, 2393 2394 (AF_WritingSystem_InitHintsFunc) af_latin2_hints_init, 2395 (AF_WritingSystem_ApplyHintsFunc) af_latin2_hints_apply 2396 ) 2397 2398 2399/* END */ 2400