1 /***************************************************************************/ 2 /* */ 3 /* aflatin2.c */ 4 /* */ 5 /* Auto-fitter hinting routines for latin script (body). */ 6 /* */ 7 /* Copyright 2003-2011 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 "aflatin.h" 22 #include "aflatin2.h" 23 #include "aferrors.h" 24 25 26 #ifdef AF_CONFIG_OPTION_USE_WARPER 27 #include "afwarp.h" 28 #endif 29 30 31 /*************************************************************************/ 32 /* */ 33 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 34 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 35 /* messages during execution. */ 36 /* */ 37 #undef FT_COMPONENT 38 #define FT_COMPONENT trace_aflatin2 39 40 41 FT_LOCAL_DEF( FT_Error ) 42 af_latin2_hints_compute_segments( AF_GlyphHints hints, 43 AF_Dimension dim ); 44 45 FT_LOCAL_DEF( void ) 46 af_latin2_hints_link_segments( AF_GlyphHints hints, 47 AF_Dimension dim ); 48 49 /*************************************************************************/ 50 /*************************************************************************/ 51 /***** *****/ 52 /***** L A T I N G L O B A L M E T R I C S *****/ 53 /***** *****/ 54 /*************************************************************************/ 55 /*************************************************************************/ 56 57 FT_LOCAL_DEF( void ) 58 af_latin2_metrics_init_widths( AF_LatinMetrics metrics, 59 FT_Face face, 60 FT_ULong charcode ) 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( face, charcode ); 80 if ( glyph_index == 0 ) 81 goto Exit; 82 83 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 84 if ( error || face->glyph->outline.n_points <= 0 ) 85 goto Exit; 86 87 FT_ZERO( dummy ); 88 89 dummy->units_per_em = metrics->units_per_em; 90 scaler->x_scale = scaler->y_scale = 0x10000L; 91 scaler->x_delta = scaler->y_delta = 0; 92 scaler->face = face; 93 scaler->render_mode = FT_RENDER_MODE_NORMAL; 94 scaler->flags = 0; 95 96 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)dummy ); 97 98 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 99 if ( error ) 100 goto Exit; 101 102 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 103 { 104 AF_LatinAxis axis = &metrics->axis[dim]; 105 AF_AxisHints axhints = &hints->axis[dim]; 106 AF_Segment seg, limit, link; 107 FT_UInt num_widths = 0; 108 109 110 error = af_latin2_hints_compute_segments( hints, 111 (AF_Dimension)dim ); 112 if ( error ) 113 goto Exit; 114 115 af_latin2_hints_link_segments( hints, 116 (AF_Dimension)dim ); 117 118 seg = axhints->segments; 119 limit = seg + axhints->num_segments; 120 121 for ( ; seg < limit; seg++ ) 122 { 123 link = seg->link; 124 125 /* we only consider stem segments there! */ 126 if ( link && link->link == seg && link > seg ) 127 { 128 FT_Pos dist; 129 130 131 dist = seg->pos - link->pos; 132 if ( dist < 0 ) 133 dist = -dist; 134 135 if ( num_widths < AF_LATIN_MAX_WIDTHS ) 136 axis->widths[num_widths++].org = dist; 137 } 138 } 139 140 af_sort_widths( num_widths, axis->widths ); 141 axis->width_count = num_widths; 142 } 143 144 Exit: 145 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 146 { 147 AF_LatinAxis axis = &metrics->axis[dim]; 148 FT_Pos stdw; 149 150 151 stdw = ( axis->width_count > 0 ) 152 ? axis->widths[0].org 153 : AF_LATIN_CONSTANT( metrics, 50 ); 154 155 /* let's try 20% of the smallest width */ 156 axis->edge_distance_threshold = stdw / 5; 157 axis->standard_width = stdw; 158 axis->extra_light = 0; 159 } 160 } 161 162 af_glyph_hints_done( hints ); 163 } 164 165 166 167 #define AF_LATIN_MAX_TEST_CHARACTERS 12 168 169 170 static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES] 171 [AF_LATIN_MAX_TEST_CHARACTERS+1] = 172 { 173 "THEZOCQS", 174 "HEZLOCUS", 175 "fijkdbh", 176 "xzroesc", 177 "xzroesc", 178 "pqgjy" 179 }; 180 181 182 static void 183 af_latin2_metrics_init_blues( AF_LatinMetrics metrics, 184 FT_Face face ) 185 { 186 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS]; 187 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS]; 188 FT_Int num_flats; 189 FT_Int num_rounds; 190 FT_Int bb; 191 AF_LatinBlue blue; 192 FT_Error error; 193 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT]; 194 FT_GlyphSlot glyph = face->glyph; 195 196 197 /* we compute the blues simply by loading each character from the */ 198 /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */ 199 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */ 200 201 FT_TRACE5(( "blue zones computation\n" )); 202 FT_TRACE5(( "------------------------------------------------\n" )); 203 204 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 205 { 206 const char* p = af_latin2_blue_chars[bb]; 207 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS; 208 FT_Pos* blue_ref; 209 FT_Pos* blue_shoot; 210 211 212 FT_TRACE5(( "blue %3d: ", bb )); 213 214 num_flats = 0; 215 num_rounds = 0; 216 217 for ( ; p < limit && *p; p++ ) 218 { 219 FT_UInt glyph_index; 220 FT_Int best_point, best_y, best_first, best_last; 221 FT_Vector* points; 222 FT_Bool round; 223 224 225 FT_TRACE5(( "'%c'", *p )); 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(( "%5d", 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_Int start, end, prev, next; 296 FT_Pos dist; 297 298 299 /* now look for the previous and next points that are not on the */ 300 /* same Y coordinate. Threshold the `closeness'... */ 301 start = end = best_point; 302 303 do 304 { 305 prev = start-1; 306 if ( prev < best_first ) 307 prev = best_last; 308 309 dist = points[prev].y - best_y; 310 if ( dist < -5 || dist > 5 ) 311 break; 312 313 start = prev; 314 315 } while ( start != best_point ); 316 317 do 318 { 319 next = end+1; 320 if ( next > best_last ) 321 next = best_first; 322 323 dist = points[next].y - best_y; 324 if ( dist < -5 || dist > 5 ) 325 break; 326 327 end = next; 328 329 } while ( end != best_point ); 330 331 /* now, set the `round' flag depending on the segment's kind */ 332 round = FT_BOOL( 333 FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON || 334 FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON ); 335 336 FT_TRACE5(( "%c ", round ? 'r' : 'f' )); 337 } 338 339 if ( round ) 340 rounds[num_rounds++] = best_y; 341 else 342 flats[num_flats++] = best_y; 343 } 344 345 FT_TRACE5(( "\n" )); 346 347 if ( num_flats == 0 && num_rounds == 0 ) 348 { 349 /* 350 * we couldn't find a single glyph to compute this blue zone, 351 * we will simply ignore it then 352 */ 353 FT_TRACE5(( "empty\n" )); 354 continue; 355 } 356 357 /* we have computed the contents of the `rounds' and `flats' tables, */ 358 /* now determine the reference and overshoot position of the blue -- */ 359 /* we simply take the median value after a simple sort */ 360 af_sort_pos( num_rounds, rounds ); 361 af_sort_pos( num_flats, flats ); 362 363 blue = & axis->blues[axis->blue_count]; 364 blue_ref = & blue->ref.org; 365 blue_shoot = & blue->shoot.org; 366 367 axis->blue_count++; 368 369 if ( num_flats == 0 ) 370 { 371 *blue_ref = 372 *blue_shoot = rounds[num_rounds / 2]; 373 } 374 else if ( num_rounds == 0 ) 375 { 376 *blue_ref = 377 *blue_shoot = flats[num_flats / 2]; 378 } 379 else 380 { 381 *blue_ref = flats[num_flats / 2]; 382 *blue_shoot = rounds[num_rounds / 2]; 383 } 384 385 /* there are sometimes problems: if the overshoot position of top */ 386 /* zones is under its reference position, or the opposite for bottom */ 387 /* zones. We must thus check everything there and correct the errors */ 388 if ( *blue_shoot != *blue_ref ) 389 { 390 FT_Pos ref = *blue_ref; 391 FT_Pos shoot = *blue_shoot; 392 FT_Bool over_ref = FT_BOOL( shoot > ref ); 393 394 395 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref ) 396 *blue_shoot = *blue_ref = ( shoot + ref ) / 2; 397 } 398 399 blue->flags = 0; 400 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 401 blue->flags |= AF_LATIN_BLUE_TOP; 402 403 /* 404 * The following flags is used later to adjust the y and x scales 405 * in order to optimize the pixel grid alignment of the top of small 406 * letters. 407 */ 408 if ( bb == AF_LATIN_BLUE_SMALL_TOP ) 409 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT; 410 411 FT_TRACE5(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot )); 412 } 413 414 return; 415 } 416 417 418 FT_LOCAL_DEF( void ) 419 af_latin2_metrics_check_digits( AF_LatinMetrics metrics, 420 FT_Face face ) 421 { 422 FT_UInt i; 423 FT_Bool started = 0, same_width = 1; 424 FT_Fixed advance, old_advance = 0; 425 426 427 /* check whether all ASCII digits have the same advance width; */ 428 /* digit `0' is 0x30 in all supported charmaps */ 429 for ( i = 0x30; i <= 0x39; i++ ) 430 { 431 FT_UInt glyph_index; 432 433 434 glyph_index = FT_Get_Char_Index( face, i ); 435 if ( glyph_index == 0 ) 436 continue; 437 438 if ( FT_Get_Advance( face, glyph_index, 439 FT_LOAD_NO_SCALE | 440 FT_LOAD_NO_HINTING | 441 FT_LOAD_IGNORE_TRANSFORM, 442 &advance ) ) 443 continue; 444 445 if ( started ) 446 { 447 if ( advance != old_advance ) 448 { 449 same_width = 0; 450 break; 451 } 452 } 453 else 454 { 455 old_advance = advance; 456 started = 1; 457 } 458 } 459 460 metrics->root.digits_have_same_width = same_width; 461 } 462 463 464 FT_LOCAL_DEF( FT_Error ) 465 af_latin2_metrics_init( AF_LatinMetrics metrics, 466 FT_Face face ) 467 { 468 FT_Error error = AF_Err_Ok; 469 FT_CharMap oldmap = face->charmap; 470 FT_UInt ee; 471 472 static const FT_Encoding latin_encodings[] = 473 { 474 FT_ENCODING_UNICODE, 475 FT_ENCODING_APPLE_ROMAN, 476 FT_ENCODING_ADOBE_STANDARD, 477 FT_ENCODING_ADOBE_LATIN_1, 478 FT_ENCODING_NONE /* end of list */ 479 }; 480 481 482 metrics->units_per_em = face->units_per_EM; 483 484 /* do we have a latin charmap in there? */ 485 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ ) 486 { 487 error = FT_Select_Charmap( face, latin_encodings[ee] ); 488 if ( !error ) 489 break; 490 } 491 492 if ( !error ) 493 { 494 /* For now, compute the standard width and height from the `o'. */ 495 af_latin2_metrics_init_widths( metrics, face, 'o' ); 496 af_latin2_metrics_init_blues( metrics, face ); 497 af_latin2_metrics_check_digits( metrics, face ); 498 } 499 500 FT_Set_Charmap( face, oldmap ); 501 return AF_Err_Ok; 502 } 503 504 505 static void 506 af_latin2_metrics_scale_dim( AF_LatinMetrics metrics, 507 AF_Scaler scaler, 508 AF_Dimension dim ) 509 { 510 FT_Fixed scale; 511 FT_Pos delta; 512 AF_LatinAxis axis; 513 FT_UInt nn; 514 515 516 if ( dim == AF_DIMENSION_HORZ ) 517 { 518 scale = scaler->x_scale; 519 delta = scaler->x_delta; 520 } 521 else 522 { 523 scale = scaler->y_scale; 524 delta = scaler->y_delta; 525 } 526 527 axis = &metrics->axis[dim]; 528 529 if ( axis->org_scale == scale && axis->org_delta == delta ) 530 return; 531 532 axis->org_scale = scale; 533 axis->org_delta = delta; 534 535 /* 536 * correct Y scale to optimize the alignment of the top of small 537 * letters to the pixel grid 538 */ 539 if ( dim == AF_DIMENSION_VERT ) 540 { 541 AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT]; 542 AF_LatinBlue blue = NULL; 543 544 545 for ( nn = 0; nn < vaxis->blue_count; nn++ ) 546 { 547 if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT ) 548 { 549 blue = &vaxis->blues[nn]; 550 break; 551 } 552 } 553 554 if ( blue ) 555 { 556 FT_Pos scaled = FT_MulFix( blue->shoot.org, scaler->y_scale ); 557 FT_Pos fitted = ( scaled + 40 ) & ~63; 558 559 #if 1 560 if ( scaled != fitted ) 561 { 562 scale = FT_MulDiv( scale, fitted, scaled ); 563 FT_TRACE5(( "== scaled x-top = %.2g" 564 " fitted = %.2g, scaling = %.4g\n", 565 scaled / 64.0, fitted / 64.0, 566 ( fitted * 1.0 ) / scaled )); 567 } 568 #endif 569 } 570 } 571 572 axis->scale = scale; 573 axis->delta = delta; 574 575 if ( dim == AF_DIMENSION_HORZ ) 576 { 577 metrics->root.scaler.x_scale = scale; 578 metrics->root.scaler.x_delta = delta; 579 } 580 else 581 { 582 metrics->root.scaler.y_scale = scale; 583 metrics->root.scaler.y_delta = delta; 584 } 585 586 /* scale the standard widths */ 587 for ( nn = 0; nn < axis->width_count; nn++ ) 588 { 589 AF_Width width = axis->widths + nn; 590 591 592 width->cur = FT_MulFix( width->org, scale ); 593 width->fit = width->cur; 594 } 595 596 /* an extra-light axis corresponds to a standard width that is */ 597 /* smaller than 5/8 pixels */ 598 axis->extra_light = 599 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 ); 600 601 if ( dim == AF_DIMENSION_VERT ) 602 { 603 /* scale the blue zones */ 604 for ( nn = 0; nn < axis->blue_count; nn++ ) 605 { 606 AF_LatinBlue blue = &axis->blues[nn]; 607 FT_Pos dist; 608 609 610 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 611 blue->ref.fit = blue->ref.cur; 612 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 613 blue->shoot.fit = blue->shoot.cur; 614 blue->flags &= ~AF_LATIN_BLUE_ACTIVE; 615 616 /* a blue zone is only active if it is less than 3/4 pixels tall */ 617 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 618 if ( dist <= 48 && dist >= -48 ) 619 { 620 FT_Pos delta1, delta2; 621 622 delta1 = blue->shoot.org - blue->ref.org; 623 delta2 = delta1; 624 if ( delta1 < 0 ) 625 delta2 = -delta2; 626 627 delta2 = FT_MulFix( delta2, scale ); 628 629 if ( delta2 < 32 ) 630 delta2 = 0; 631 else if ( delta2 < 64 ) 632 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 633 else 634 delta2 = FT_PIX_ROUND( delta2 ); 635 636 if ( delta1 < 0 ) 637 delta2 = -delta2; 638 639 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 640 blue->shoot.fit = blue->ref.fit + delta2; 641 642 FT_TRACE5(( ">> activating blue zone %d:" 643 " ref.cur=%.2g ref.fit=%.2g" 644 " shoot.cur=%.2g shoot.fit=%.2g\n", 645 nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0, 646 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 )); 647 648 blue->flags |= AF_LATIN_BLUE_ACTIVE; 649 } 650 } 651 } 652 } 653 654 655 FT_LOCAL_DEF( void ) 656 af_latin2_metrics_scale( AF_LatinMetrics metrics, 657 AF_Scaler scaler ) 658 { 659 metrics->root.scaler.render_mode = scaler->render_mode; 660 metrics->root.scaler.face = scaler->face; 661 662 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 663 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 664 } 665 666 667 /*************************************************************************/ 668 /*************************************************************************/ 669 /***** *****/ 670 /***** L A T I N G L Y P H A N A L Y S I S *****/ 671 /***** *****/ 672 /*************************************************************************/ 673 /*************************************************************************/ 674 675 #define SORT_SEGMENTS 676 677 FT_LOCAL_DEF( FT_Error ) 678 af_latin2_hints_compute_segments( AF_GlyphHints hints, 679 AF_Dimension dim ) 680 { 681 AF_AxisHints axis = &hints->axis[dim]; 682 FT_Memory memory = hints->memory; 683 FT_Error error = AF_Err_Ok; 684 AF_Segment segment = NULL; 685 AF_SegmentRec seg0; 686 AF_Point* contour = hints->contours; 687 AF_Point* contour_limit = contour + hints->num_contours; 688 AF_Direction major_dir, segment_dir; 689 690 691 FT_ZERO( &seg0 ); 692 seg0.score = 32000; 693 seg0.flags = AF_EDGE_NORMAL; 694 695 major_dir = (AF_Direction)FT_ABS( axis->major_dir ); 696 segment_dir = major_dir; 697 698 axis->num_segments = 0; 699 700 /* set up (u,v) in each point */ 701 if ( dim == AF_DIMENSION_HORZ ) 702 { 703 AF_Point point = hints->points; 704 AF_Point limit = point + hints->num_points; 705 706 707 for ( ; point < limit; point++ ) 708 { 709 point->u = point->fx; 710 point->v = point->fy; 711 } 712 } 713 else 714 { 715 AF_Point point = hints->points; 716 AF_Point limit = point + hints->num_points; 717 718 719 for ( ; point < limit; point++ ) 720 { 721 point->u = point->fy; 722 point->v = point->fx; 723 } 724 } 725 726 /* do each contour separately */ 727 for ( ; contour < contour_limit; contour++ ) 728 { 729 AF_Point point = contour[0]; 730 AF_Point start = point; 731 AF_Point last = point->prev; 732 733 734 if ( point == last ) /* skip singletons -- just in case */ 735 continue; 736 737 /* already on an edge ?, backtrack to find its start */ 738 if ( FT_ABS( point->in_dir ) == major_dir ) 739 { 740 point = point->prev; 741 742 while ( point->in_dir == start->in_dir ) 743 point = point->prev; 744 } 745 else /* otherwise, find first segment start, if any */ 746 { 747 while ( FT_ABS( point->out_dir ) != major_dir ) 748 { 749 point = point->next; 750 751 if ( point == start ) 752 goto NextContour; 753 } 754 } 755 756 start = point; 757 758 for (;;) 759 { 760 AF_Point first; 761 FT_Pos min_u, min_v, max_u, max_v; 762 763 /* we're at the start of a new segment */ 764 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir && 765 point->in_dir != point->out_dir ); 766 first = point; 767 768 min_u = max_u = point->u; 769 min_v = max_v = point->v; 770 771 point = point->next; 772 773 while ( point->out_dir == first->out_dir ) 774 { 775 point = point->next; 776 777 if ( point->u < min_u ) 778 min_u = point->u; 779 780 if ( point->u > max_u ) 781 max_u = point->u; 782 } 783 784 if ( point->v < min_v ) 785 min_v = point->v; 786 787 if ( point->v > max_v ) 788 max_v = point->v; 789 790 /* record new segment */ 791 error = af_axis_hints_new_segment( axis, memory, &segment ); 792 if ( error ) 793 goto Exit; 794 795 segment[0] = seg0; 796 segment->dir = first->out_dir; 797 segment->first = first; 798 segment->last = point; 799 segment->pos = (FT_Short)(( min_u + max_u ) >> 1); 800 segment->min_coord = (FT_Short) min_v; 801 segment->max_coord = (FT_Short) max_v; 802 segment->height = (FT_Short)(max_v - min_v); 803 804 /* a segment is round if it doesn't have successive */ 805 /* on-curve points. */ 806 { 807 AF_Point pt = first; 808 AF_Point last = point; 809 AF_Flags f0 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL); 810 AF_Flags f1; 811 812 813 segment->flags &= ~AF_EDGE_ROUND; 814 815 for ( ; pt != last; f0 = f1 ) 816 { 817 pt = pt->next; 818 f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL); 819 820 if ( !f0 && !f1 ) 821 break; 822 823 if ( pt == last ) 824 segment->flags |= AF_EDGE_ROUND; 825 } 826 } 827 828 /* this can happen in the case of a degenerate contour 829 * e.g. a 2-point vertical contour 830 */ 831 if ( point == start ) 832 break; 833 834 /* jump to the start of the next segment, if any */ 835 while ( FT_ABS(point->out_dir) != major_dir ) 836 { 837 point = point->next; 838 839 if ( point == start ) 840 goto NextContour; 841 } 842 } 843 844 NextContour: 845 ; 846 } /* contours */ 847 848 /* now slightly increase the height of segments when this makes */ 849 /* sense -- this is used to better detect and ignore serifs */ 850 { 851 AF_Segment segments = axis->segments; 852 AF_Segment segments_end = segments + axis->num_segments; 853 854 855 for ( segment = segments; segment < segments_end; segment++ ) 856 { 857 AF_Point first = segment->first; 858 AF_Point last = segment->last; 859 AF_Point p; 860 FT_Pos first_v = first->v; 861 FT_Pos last_v = last->v; 862 863 864 if ( first == last ) 865 continue; 866 867 if ( first_v < last_v ) 868 { 869 p = first->prev; 870 if ( p->v < first_v ) 871 segment->height = (FT_Short)( segment->height + 872 ( ( first_v - p->v ) >> 1 ) ); 873 874 p = last->next; 875 if ( p->v > last_v ) 876 segment->height = (FT_Short)( segment->height + 877 ( ( p->v - last_v ) >> 1 ) ); 878 } 879 else 880 { 881 p = first->prev; 882 if ( p->v > first_v ) 883 segment->height = (FT_Short)( segment->height + 884 ( ( p->v - first_v ) >> 1 ) ); 885 886 p = last->next; 887 if ( p->v < last_v ) 888 segment->height = (FT_Short)( segment->height + 889 ( ( last_v - p->v ) >> 1 ) ); 890 } 891 } 892 } 893 894 #ifdef AF_SORT_SEGMENTS 895 /* place all segments with a negative direction to the start 896 * of the array, used to speed up segment linking later... 897 */ 898 { 899 AF_Segment segments = axis->segments; 900 FT_UInt count = axis->num_segments; 901 FT_UInt ii, jj; 902 903 for (ii = 0; ii < count; ii++) 904 { 905 if ( segments[ii].dir > 0 ) 906 { 907 for (jj = ii+1; jj < count; jj++) 908 { 909 if ( segments[jj].dir < 0 ) 910 { 911 AF_SegmentRec tmp; 912 913 tmp = segments[ii]; 914 segments[ii] = segments[jj]; 915 segments[jj] = tmp; 916 917 break; 918 } 919 } 920 921 if ( jj == count ) 922 break; 923 } 924 } 925 axis->mid_segments = ii; 926 } 927 #endif 928 929 Exit: 930 return error; 931 } 932 933 934 FT_LOCAL_DEF( void ) 935 af_latin2_hints_link_segments( AF_GlyphHints hints, 936 AF_Dimension dim ) 937 { 938 AF_AxisHints axis = &hints->axis[dim]; 939 AF_Segment segments = axis->segments; 940 AF_Segment segment_limit = segments + axis->num_segments; 941 #ifdef AF_SORT_SEGMENTS 942 AF_Segment segment_mid = segments + axis->mid_segments; 943 #endif 944 FT_Pos len_threshold, len_score; 945 AF_Segment seg1, seg2; 946 947 948 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 949 if ( len_threshold == 0 ) 950 len_threshold = 1; 951 952 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 ); 953 954 #ifdef AF_SORT_SEGMENTS 955 for ( seg1 = segments; seg1 < segment_mid; seg1++ ) 956 { 957 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last ) 958 continue; 959 960 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ ) 961 #else 962 /* now compare each segment to the others */ 963 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 964 { 965 /* the fake segments are introduced to hint the metrics -- */ 966 /* we must never link them to anything */ 967 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last ) 968 continue; 969 970 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 971 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos ) 972 #endif 973 { 974 FT_Pos pos1 = seg1->pos; 975 FT_Pos pos2 = seg2->pos; 976 FT_Pos dist = pos2 - pos1; 977 978 979 if ( dist < 0 ) 980 continue; 981 982 { 983 FT_Pos min = seg1->min_coord; 984 FT_Pos max = seg1->max_coord; 985 FT_Pos len, score; 986 987 988 if ( min < seg2->min_coord ) 989 min = seg2->min_coord; 990 991 if ( max > seg2->max_coord ) 992 max = seg2->max_coord; 993 994 len = max - min; 995 if ( len >= len_threshold ) 996 { 997 score = dist + len_score / len; 998 if ( score < seg1->score ) 999 { 1000 seg1->score = score; 1001 seg1->link = seg2; 1002 } 1003 1004 if ( score < seg2->score ) 1005 { 1006 seg2->score = score; 1007 seg2->link = seg1; 1008 } 1009 } 1010 } 1011 } 1012 } 1013 #if 0 1014 } 1015 #endif 1016 1017 /* now, compute the `serif' segments */ 1018 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1019 { 1020 seg2 = seg1->link; 1021 1022 if ( seg2 ) 1023 { 1024 if ( seg2->link != seg1 ) 1025 { 1026 seg1->link = 0; 1027 seg1->serif = seg2->link; 1028 } 1029 } 1030 } 1031 } 1032 1033 1034 FT_LOCAL_DEF( FT_Error ) 1035 af_latin2_hints_compute_edges( AF_GlyphHints hints, 1036 AF_Dimension dim ) 1037 { 1038 AF_AxisHints axis = &hints->axis[dim]; 1039 FT_Error error = AF_Err_Ok; 1040 FT_Memory memory = hints->memory; 1041 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim]; 1042 1043 AF_Segment segments = axis->segments; 1044 AF_Segment segment_limit = segments + axis->num_segments; 1045 AF_Segment seg; 1046 1047 AF_Direction up_dir; 1048 FT_Fixed scale; 1049 FT_Pos edge_distance_threshold; 1050 FT_Pos segment_length_threshold; 1051 1052 1053 axis->num_edges = 0; 1054 1055 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 1056 : hints->y_scale; 1057 1058 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP 1059 : AF_DIR_RIGHT; 1060 1061 /* 1062 * We want to ignore very small (mostly serif) segments, we do that 1063 * by ignoring those that whose length is less than a given fraction 1064 * of the standard width. If there is no standard width, we ignore 1065 * those that are less than a given size in pixels 1066 * 1067 * also, unlink serif segments that are linked to segments farther 1068 * than 50% of the standard width 1069 */ 1070 if ( dim == AF_DIMENSION_HORZ ) 1071 { 1072 if ( laxis->width_count > 0 ) 1073 segment_length_threshold = (laxis->standard_width * 10 ) >> 4; 1074 else 1075 segment_length_threshold = FT_DivFix( 64, hints->y_scale ); 1076 } 1077 else 1078 segment_length_threshold = 0; 1079 1080 /*********************************************************************/ 1081 /* */ 1082 /* We will begin by generating a sorted table of edges for the */ 1083 /* current direction. To do so, we simply scan each segment and try */ 1084 /* to find an edge in our table that corresponds to its position. */ 1085 /* */ 1086 /* If no edge is found, we create and insert a new edge in the */ 1087 /* sorted table. Otherwise, we simply add the segment to the edge's */ 1088 /* list which will be processed in the second step to compute the */ 1089 /* edge's properties. */ 1090 /* */ 1091 /* Note that the edges table is sorted along the segment/edge */ 1092 /* position. */ 1093 /* */ 1094 /*********************************************************************/ 1095 1096 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1097 scale ); 1098 if ( edge_distance_threshold > 64 / 4 ) 1099 edge_distance_threshold = 64 / 4; 1100 1101 edge_distance_threshold = FT_DivFix( edge_distance_threshold, 1102 scale ); 1103 1104 for ( seg = segments; seg < segment_limit; seg++ ) 1105 { 1106 AF_Edge found = 0; 1107 FT_Int ee; 1108 1109 1110 if ( seg->height < segment_length_threshold ) 1111 continue; 1112 1113 /* A special case for serif edges: If they are smaller than */ 1114 /* 1.5 pixels we ignore them. */ 1115 if ( seg->serif ) 1116 { 1117 FT_Pos dist = seg->serif->pos - seg->pos; 1118 1119 if (dist < 0) 1120 dist = -dist; 1121 1122 if (dist >= laxis->standard_width >> 1) 1123 { 1124 /* unlink this serif, it is too distant from its reference stem */ 1125 seg->serif = NULL; 1126 } 1127 else if ( 2*seg->height < 3 * segment_length_threshold ) 1128 continue; 1129 } 1130 1131 /* look for an edge corresponding to the segment */ 1132 for ( ee = 0; ee < axis->num_edges; ee++ ) 1133 { 1134 AF_Edge edge = axis->edges + ee; 1135 FT_Pos dist; 1136 1137 1138 dist = seg->pos - edge->fpos; 1139 if ( dist < 0 ) 1140 dist = -dist; 1141 1142 if ( dist < edge_distance_threshold && edge->dir == seg->dir ) 1143 { 1144 found = edge; 1145 break; 1146 } 1147 } 1148 1149 if ( !found ) 1150 { 1151 AF_Edge edge; 1152 1153 1154 /* insert a new edge in the list and */ 1155 /* sort according to the position */ 1156 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, 1157 memory, &edge ); 1158 if ( error ) 1159 goto Exit; 1160 1161 /* add the segment to the new edge's list */ 1162 FT_ZERO( edge ); 1163 1164 edge->first = seg; 1165 edge->last = seg; 1166 edge->fpos = seg->pos; 1167 edge->dir = seg->dir; 1168 edge->opos = edge->pos = FT_MulFix( seg->pos, scale ); 1169 seg->edge_next = seg; 1170 } 1171 else 1172 { 1173 /* if an edge was found, simply add the segment to the edge's */ 1174 /* list */ 1175 seg->edge_next = found->first; 1176 found->last->edge_next = seg; 1177 found->last = seg; 1178 } 1179 } 1180 1181 1182 /*********************************************************************/ 1183 /* */ 1184 /* Good, we will now compute each edge's properties according to */ 1185 /* segments found on its position. Basically, these are: */ 1186 /* */ 1187 /* - edge's main direction */ 1188 /* - stem edge, serif edge or both (which defaults to stem then) */ 1189 /* - rounded edge, straight or both (which defaults to straight) */ 1190 /* - link for edge */ 1191 /* */ 1192 /*********************************************************************/ 1193 1194 /* first of all, set the `edge' field in each segment -- this is */ 1195 /* required in order to compute edge links */ 1196 1197 /* 1198 * Note that removing this loop and setting the `edge' field of each 1199 * segment directly in the code above slows down execution speed for 1200 * some reasons on platforms like the Sun. 1201 */ 1202 { 1203 AF_Edge edges = axis->edges; 1204 AF_Edge edge_limit = edges + axis->num_edges; 1205 AF_Edge edge; 1206 1207 1208 for ( edge = edges; edge < edge_limit; edge++ ) 1209 { 1210 seg = edge->first; 1211 if ( seg ) 1212 do 1213 { 1214 seg->edge = edge; 1215 seg = seg->edge_next; 1216 1217 } while ( seg != edge->first ); 1218 } 1219 1220 /* now, compute each edge properties */ 1221 for ( edge = edges; edge < edge_limit; edge++ ) 1222 { 1223 FT_Int is_round = 0; /* does it contain round segments? */ 1224 FT_Int is_straight = 0; /* does it contain straight segments? */ 1225 #if 0 1226 FT_Pos ups = 0; /* number of upwards segments */ 1227 FT_Pos downs = 0; /* number of downwards segments */ 1228 #endif 1229 1230 1231 seg = edge->first; 1232 1233 do 1234 { 1235 FT_Bool is_serif; 1236 1237 1238 /* check for roundness of segment */ 1239 if ( seg->flags & AF_EDGE_ROUND ) 1240 is_round++; 1241 else 1242 is_straight++; 1243 1244 #if 0 1245 /* check for segment direction */ 1246 if ( seg->dir == up_dir ) 1247 ups += seg->max_coord-seg->min_coord; 1248 else 1249 downs += seg->max_coord-seg->min_coord; 1250 #endif 1251 1252 /* check for links -- if seg->serif is set, then seg->link must */ 1253 /* be ignored */ 1254 is_serif = (FT_Bool)( seg->serif && 1255 seg->serif->edge && 1256 seg->serif->edge != edge ); 1257 1258 if ( ( seg->link && seg->link->edge != NULL ) || is_serif ) 1259 { 1260 AF_Edge edge2; 1261 AF_Segment seg2; 1262 1263 1264 edge2 = edge->link; 1265 seg2 = seg->link; 1266 1267 if ( is_serif ) 1268 { 1269 seg2 = seg->serif; 1270 edge2 = edge->serif; 1271 } 1272 1273 if ( edge2 ) 1274 { 1275 FT_Pos edge_delta; 1276 FT_Pos seg_delta; 1277 1278 1279 edge_delta = edge->fpos - edge2->fpos; 1280 if ( edge_delta < 0 ) 1281 edge_delta = -edge_delta; 1282 1283 seg_delta = seg->pos - seg2->pos; 1284 if ( seg_delta < 0 ) 1285 seg_delta = -seg_delta; 1286 1287 if ( seg_delta < edge_delta ) 1288 edge2 = seg2->edge; 1289 } 1290 else 1291 edge2 = seg2->edge; 1292 1293 if ( is_serif ) 1294 { 1295 edge->serif = edge2; 1296 edge2->flags |= AF_EDGE_SERIF; 1297 } 1298 else 1299 edge->link = edge2; 1300 } 1301 1302 seg = seg->edge_next; 1303 1304 } while ( seg != edge->first ); 1305 1306 /* set the round/straight flags */ 1307 edge->flags = AF_EDGE_NORMAL; 1308 1309 if ( is_round > 0 && is_round >= is_straight ) 1310 edge->flags |= AF_EDGE_ROUND; 1311 1312 #if 0 1313 /* set the edge's main direction */ 1314 edge->dir = AF_DIR_NONE; 1315 1316 if ( ups > downs ) 1317 edge->dir = (FT_Char)up_dir; 1318 1319 else if ( ups < downs ) 1320 edge->dir = (FT_Char)-up_dir; 1321 1322 else if ( ups == downs ) 1323 edge->dir = 0; /* both up and down! */ 1324 #endif 1325 1326 /* gets rid of serifs if link is set */ 1327 /* XXX: This gets rid of many unpleasant artefacts! */ 1328 /* Example: the `c' in cour.pfa at size 13 */ 1329 1330 if ( edge->serif && edge->link ) 1331 edge->serif = 0; 1332 } 1333 } 1334 1335 Exit: 1336 return error; 1337 } 1338 1339 1340 FT_LOCAL_DEF( FT_Error ) 1341 af_latin2_hints_detect_features( AF_GlyphHints hints, 1342 AF_Dimension dim ) 1343 { 1344 FT_Error error; 1345 1346 1347 error = af_latin2_hints_compute_segments( hints, dim ); 1348 if ( !error ) 1349 { 1350 af_latin2_hints_link_segments( hints, dim ); 1351 1352 error = af_latin2_hints_compute_edges( hints, dim ); 1353 } 1354 return error; 1355 } 1356 1357 1358 FT_LOCAL_DEF( void ) 1359 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints, 1360 AF_LatinMetrics metrics ) 1361 { 1362 AF_AxisHints axis = &hints->axis[AF_DIMENSION_VERT]; 1363 AF_Edge edge = axis->edges; 1364 AF_Edge edge_limit = edge + axis->num_edges; 1365 AF_LatinAxis latin = &metrics->axis[AF_DIMENSION_VERT]; 1366 FT_Fixed scale = latin->scale; 1367 FT_Pos best_dist0; /* initial threshold */ 1368 1369 1370 /* compute the initial threshold as a fraction of the EM size */ 1371 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1372 1373 if ( best_dist0 > 64 / 2 ) 1374 best_dist0 = 64 / 2; 1375 1376 /* compute which blue zones are active, i.e. have their scaled */ 1377 /* size < 3/4 pixels */ 1378 1379 /* for each horizontal edge search the blue zone which is closest */ 1380 for ( ; edge < edge_limit; edge++ ) 1381 { 1382 FT_Int bb; 1383 AF_Width best_blue = NULL; 1384 FT_Pos best_dist = best_dist0; 1385 1386 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 1387 { 1388 AF_LatinBlue blue = latin->blues + bb; 1389 FT_Bool is_top_blue, is_major_dir; 1390 1391 1392 /* skip inactive blue zones (i.e., those that are too small) */ 1393 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) ) 1394 continue; 1395 1396 /* if it is a top zone, check for right edges -- if it is a bottom */ 1397 /* zone, check for left edges */ 1398 /* */ 1399 /* of course, that's for TrueType */ 1400 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 ); 1401 is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); 1402 1403 /* if it is a top zone, the edge must be against the major */ 1404 /* direction; if it is a bottom zone, it must be in the major */ 1405 /* direction */ 1406 if ( is_top_blue ^ is_major_dir ) 1407 { 1408 FT_Pos dist; 1409 AF_Width compare; 1410 1411 1412 /* if it's a rounded edge, compare it to the overshoot position */ 1413 /* if it's a flat edge, compare it to the reference position */ 1414 if ( edge->flags & AF_EDGE_ROUND ) 1415 compare = &blue->shoot; 1416 else 1417 compare = &blue->ref; 1418 1419 dist = edge->fpos - compare->org; 1420 if (dist < 0) 1421 dist = -dist; 1422 1423 dist = FT_MulFix( dist, scale ); 1424 if ( dist < best_dist ) 1425 { 1426 best_dist = dist; 1427 best_blue = compare; 1428 } 1429 1430 #if 0 1431 /* now, compare it to the overshoot position if the edge is */ 1432 /* rounded, and if the edge is over the reference position of a */ 1433 /* top zone, or under the reference position of a bottom zone */ 1434 if ( edge->flags & AF_EDGE_ROUND && dist != 0 ) 1435 { 1436 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org ); 1437 1438 1439 if ( is_top_blue ^ is_under_ref ) 1440 { 1441 blue = latin->blues + bb; 1442 dist = edge->fpos - blue->shoot.org; 1443 if ( dist < 0 ) 1444 dist = -dist; 1445 1446 dist = FT_MulFix( dist, scale ); 1447 if ( dist < best_dist ) 1448 { 1449 best_dist = dist; 1450 best_blue = & blue->shoot; 1451 } 1452 } 1453 } 1454 #endif 1455 } 1456 } 1457 1458 if ( best_blue ) 1459 edge->blue_edge = best_blue; 1460 } 1461 } 1462 1463 1464 static FT_Error 1465 af_latin2_hints_init( AF_GlyphHints hints, 1466 AF_LatinMetrics metrics ) 1467 { 1468 FT_Render_Mode mode; 1469 FT_UInt32 scaler_flags, other_flags; 1470 FT_Face face = metrics->root.scaler.face; 1471 1472 1473 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics ); 1474 1475 /* 1476 * correct x_scale and y_scale if needed, since they may have 1477 * been modified `af_latin2_metrics_scale_dim' above 1478 */ 1479 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1480 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1481 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1482 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1483 1484 /* compute flags depending on render mode, etc. */ 1485 mode = metrics->root.scaler.render_mode; 1486 1487 #if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */ 1488 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1489 { 1490 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1491 } 1492 #endif 1493 1494 scaler_flags = hints->scaler_flags; 1495 other_flags = 0; 1496 1497 /* 1498 * We snap the width of vertical stems for the monochrome and 1499 * horizontal LCD rendering targets only. 1500 */ 1501 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1502 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1503 1504 /* 1505 * We snap the width of horizontal stems for the monochrome and 1506 * vertical LCD rendering targets only. 1507 */ 1508 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1509 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1510 1511 /* 1512 * We adjust stems to full pixels only if we don't use the `light' mode. 1513 */ 1514 if ( mode != FT_RENDER_MODE_LIGHT ) 1515 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1516 1517 if ( mode == FT_RENDER_MODE_MONO ) 1518 other_flags |= AF_LATIN_HINTS_MONO; 1519 1520 /* 1521 * In `light' hinting mode we disable horizontal hinting completely. 1522 * We also do it if the face is italic. 1523 */ 1524 if ( mode == FT_RENDER_MODE_LIGHT || 1525 (face->style_flags & FT_STYLE_FLAG_ITALIC) != 0 ) 1526 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL; 1527 1528 hints->scaler_flags = scaler_flags; 1529 hints->other_flags = other_flags; 1530 1531 return 0; 1532 } 1533 1534 1535 /*************************************************************************/ 1536 /*************************************************************************/ 1537 /***** *****/ 1538 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/ 1539 /***** *****/ 1540 /*************************************************************************/ 1541 /*************************************************************************/ 1542 1543 /* snap a given width in scaled coordinates to one of the */ 1544 /* current standard widths */ 1545 1546 static FT_Pos 1547 af_latin2_snap_width( AF_Width widths, 1548 FT_Int count, 1549 FT_Pos width ) 1550 { 1551 int n; 1552 FT_Pos best = 64 + 32 + 2; 1553 FT_Pos reference = width; 1554 FT_Pos scaled; 1555 1556 1557 for ( n = 0; n < count; n++ ) 1558 { 1559 FT_Pos w; 1560 FT_Pos dist; 1561 1562 1563 w = widths[n].cur; 1564 dist = width - w; 1565 if ( dist < 0 ) 1566 dist = -dist; 1567 if ( dist < best ) 1568 { 1569 best = dist; 1570 reference = w; 1571 } 1572 } 1573 1574 scaled = FT_PIX_ROUND( reference ); 1575 1576 if ( width >= reference ) 1577 { 1578 if ( width < scaled + 48 ) 1579 width = reference; 1580 } 1581 else 1582 { 1583 if ( width > scaled - 48 ) 1584 width = reference; 1585 } 1586 1587 return width; 1588 } 1589 1590 1591 /* compute the snapped width of a given stem */ 1592 1593 static FT_Pos 1594 af_latin2_compute_stem_width( AF_GlyphHints hints, 1595 AF_Dimension dim, 1596 FT_Pos width, 1597 AF_Edge_Flags base_flags, 1598 AF_Edge_Flags stem_flags ) 1599 { 1600 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics; 1601 AF_LatinAxis axis = & metrics->axis[dim]; 1602 FT_Pos dist = width; 1603 FT_Int sign = 0; 1604 FT_Int vertical = ( dim == AF_DIMENSION_VERT ); 1605 1606 1607 FT_UNUSED(base_flags); 1608 1609 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) || 1610 axis->extra_light ) 1611 return width; 1612 1613 if ( dist < 0 ) 1614 { 1615 dist = -width; 1616 sign = 1; 1617 } 1618 1619 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1620 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1621 { 1622 /* smooth hinting process: very lightly quantize the stem width */ 1623 1624 /* leave the widths of serifs alone */ 1625 1626 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) ) 1627 goto Done_Width; 1628 1629 #if 0 1630 else if ( ( base_flags & AF_EDGE_ROUND ) ) 1631 { 1632 if ( dist < 80 ) 1633 dist = 64; 1634 } 1635 else if ( dist < 56 ) 1636 dist = 56; 1637 #endif 1638 if ( axis->width_count > 0 ) 1639 { 1640 FT_Pos delta; 1641 1642 1643 /* compare to standard width */ 1644 if ( axis->width_count > 0 ) 1645 { 1646 delta = dist - axis->widths[0].cur; 1647 1648 if ( delta < 0 ) 1649 delta = -delta; 1650 1651 if ( delta < 40 ) 1652 { 1653 dist = axis->widths[0].cur; 1654 if ( dist < 48 ) 1655 dist = 48; 1656 1657 goto Done_Width; 1658 } 1659 } 1660 1661 if ( dist < 3 * 64 ) 1662 { 1663 delta = dist & 63; 1664 dist &= -64; 1665 1666 if ( delta < 10 ) 1667 dist += delta; 1668 1669 else if ( delta < 32 ) 1670 dist += 10; 1671 1672 else if ( delta < 54 ) 1673 dist += 54; 1674 1675 else 1676 dist += delta; 1677 } 1678 else 1679 dist = ( dist + 32 ) & ~63; 1680 } 1681 } 1682 else 1683 { 1684 /* strong hinting process: snap the stem width to integer pixels */ 1685 FT_Pos org_dist = dist; 1686 1687 1688 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist ); 1689 1690 if ( vertical ) 1691 { 1692 /* in the case of vertical hinting, always round */ 1693 /* the stem heights to integer pixels */ 1694 1695 if ( dist >= 64 ) 1696 dist = ( dist + 16 ) & ~63; 1697 else 1698 dist = 64; 1699 } 1700 else 1701 { 1702 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1703 { 1704 /* monochrome horizontal hinting: snap widths to integer pixels */ 1705 /* with a different threshold */ 1706 1707 if ( dist < 64 ) 1708 dist = 64; 1709 else 1710 dist = ( dist + 32 ) & ~63; 1711 } 1712 else 1713 { 1714 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1715 /* approach: we strengthen small stems, round stems whose size */ 1716 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1717 1718 if ( dist < 48 ) 1719 dist = ( dist + 64 ) >> 1; 1720 1721 else if ( dist < 128 ) 1722 { 1723 /* We only round to an integer width if the corresponding */ 1724 /* distortion is less than 1/4 pixel. Otherwise this */ 1725 /* makes everything worse since the diagonals, which are */ 1726 /* not hinted, appear a lot bolder or thinner than the */ 1727 /* vertical stems. */ 1728 1729 FT_Int delta; 1730 1731 1732 dist = ( dist + 22 ) & ~63; 1733 delta = dist - org_dist; 1734 if ( delta < 0 ) 1735 delta = -delta; 1736 1737 if (delta >= 16) 1738 { 1739 dist = org_dist; 1740 if ( dist < 48 ) 1741 dist = ( dist + 64 ) >> 1; 1742 } 1743 } 1744 else 1745 /* round otherwise to prevent color fringes in LCD mode */ 1746 dist = ( dist + 32 ) & ~63; 1747 } 1748 } 1749 } 1750 1751 Done_Width: 1752 if ( sign ) 1753 dist = -dist; 1754 1755 return dist; 1756 } 1757 1758 1759 /* align one stem edge relative to the previous stem edge */ 1760 1761 static void 1762 af_latin2_align_linked_edge( AF_GlyphHints hints, 1763 AF_Dimension dim, 1764 AF_Edge base_edge, 1765 AF_Edge stem_edge ) 1766 { 1767 FT_Pos dist = stem_edge->opos - base_edge->opos; 1768 1769 FT_Pos fitted_width = af_latin2_compute_stem_width( 1770 hints, dim, dist, 1771 (AF_Edge_Flags)base_edge->flags, 1772 (AF_Edge_Flags)stem_edge->flags ); 1773 1774 1775 stem_edge->pos = base_edge->pos + fitted_width; 1776 1777 FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), " 1778 "dist was %.2f, now %.2f\n", 1779 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0, 1780 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 )); 1781 } 1782 1783 1784 static void 1785 af_latin2_align_serif_edge( AF_GlyphHints hints, 1786 AF_Edge base, 1787 AF_Edge serif ) 1788 { 1789 FT_UNUSED( hints ); 1790 1791 serif->pos = base->pos + (serif->opos - base->opos); 1792 } 1793 1794 1795 /*************************************************************************/ 1796 /*************************************************************************/ 1797 /*************************************************************************/ 1798 /**** ****/ 1799 /**** E D G E H I N T I N G ****/ 1800 /**** ****/ 1801 /*************************************************************************/ 1802 /*************************************************************************/ 1803 /*************************************************************************/ 1804 1805 1806 FT_LOCAL_DEF( void ) 1807 af_latin2_hint_edges( AF_GlyphHints hints, 1808 AF_Dimension dim ) 1809 { 1810 AF_AxisHints axis = &hints->axis[dim]; 1811 AF_Edge edges = axis->edges; 1812 AF_Edge edge_limit = edges + axis->num_edges; 1813 AF_Edge edge; 1814 AF_Edge anchor = 0; 1815 FT_Int has_serifs = 0; 1816 FT_Pos anchor_drift = 0; 1817 1818 1819 1820 FT_TRACE5(( "==== hinting %s edges =====\n", 1821 dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" )); 1822 1823 /* we begin by aligning all stems relative to the blue zone */ 1824 /* if needed -- that's only for horizontal edges */ 1825 1826 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) ) 1827 { 1828 for ( edge = edges; edge < edge_limit; edge++ ) 1829 { 1830 AF_Width blue; 1831 AF_Edge edge1, edge2; 1832 1833 1834 if ( edge->flags & AF_EDGE_DONE ) 1835 continue; 1836 1837 blue = edge->blue_edge; 1838 edge1 = NULL; 1839 edge2 = edge->link; 1840 1841 if ( blue ) 1842 { 1843 edge1 = edge; 1844 } 1845 else if ( edge2 && edge2->blue_edge ) 1846 { 1847 blue = edge2->blue_edge; 1848 edge1 = edge2; 1849 edge2 = edge; 1850 } 1851 1852 if ( !edge1 ) 1853 continue; 1854 1855 FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), " 1856 "was (%.2f)\n", 1857 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0, 1858 edge1->pos / 64.0 )); 1859 1860 edge1->pos = blue->fit; 1861 edge1->flags |= AF_EDGE_DONE; 1862 1863 if ( edge2 && !edge2->blue_edge ) 1864 { 1865 af_latin2_align_linked_edge( hints, dim, edge1, edge2 ); 1866 edge2->flags |= AF_EDGE_DONE; 1867 } 1868 1869 if ( !anchor ) 1870 { 1871 anchor = edge; 1872 1873 anchor_drift = (anchor->pos - anchor->opos); 1874 if (edge2) 1875 anchor_drift = (anchor_drift + (edge2->pos - edge2->opos)) >> 1; 1876 } 1877 } 1878 } 1879 1880 /* now we will align all stem edges, trying to maintain the */ 1881 /* relative order of stems in the glyph */ 1882 for ( edge = edges; edge < edge_limit; edge++ ) 1883 { 1884 AF_Edge edge2; 1885 1886 1887 if ( edge->flags & AF_EDGE_DONE ) 1888 continue; 1889 1890 /* skip all non-stem edges */ 1891 edge2 = edge->link; 1892 if ( !edge2 ) 1893 { 1894 has_serifs++; 1895 continue; 1896 } 1897 1898 /* now align the stem */ 1899 1900 /* this should not happen, but it's better to be safe */ 1901 if ( edge2->blue_edge ) 1902 { 1903 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1904 1905 af_latin2_align_linked_edge( hints, dim, edge2, edge ); 1906 edge->flags |= AF_EDGE_DONE; 1907 continue; 1908 } 1909 1910 if ( !anchor ) 1911 { 1912 FT_Pos org_len, org_center, cur_len; 1913 FT_Pos cur_pos1, error1, error2, u_off, d_off; 1914 1915 1916 org_len = edge2->opos - edge->opos; 1917 cur_len = af_latin2_compute_stem_width( 1918 hints, dim, org_len, 1919 (AF_Edge_Flags)edge->flags, 1920 (AF_Edge_Flags)edge2->flags ); 1921 if ( cur_len <= 64 ) 1922 u_off = d_off = 32; 1923 else 1924 { 1925 u_off = 38; 1926 d_off = 26; 1927 } 1928 1929 if ( cur_len < 96 ) 1930 { 1931 org_center = edge->opos + ( org_len >> 1 ); 1932 1933 cur_pos1 = FT_PIX_ROUND( org_center ); 1934 1935 error1 = org_center - ( cur_pos1 - u_off ); 1936 if ( error1 < 0 ) 1937 error1 = -error1; 1938 1939 error2 = org_center - ( cur_pos1 + d_off ); 1940 if ( error2 < 0 ) 1941 error2 = -error2; 1942 1943 if ( error1 < error2 ) 1944 cur_pos1 -= u_off; 1945 else 1946 cur_pos1 += d_off; 1947 1948 edge->pos = cur_pos1 - cur_len / 2; 1949 edge2->pos = edge->pos + cur_len; 1950 } 1951 else 1952 edge->pos = FT_PIX_ROUND( edge->opos ); 1953 1954 FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)" 1955 " snapped to (%.2f) (%.2f)\n", 1956 edge-edges, edge->opos / 64.0, 1957 edge2-edges, edge2->opos / 64.0, 1958 edge->pos / 64.0, edge2->pos / 64.0 )); 1959 anchor = edge; 1960 1961 edge->flags |= AF_EDGE_DONE; 1962 1963 af_latin2_align_linked_edge( hints, dim, edge, edge2 ); 1964 1965 edge2->flags |= AF_EDGE_DONE; 1966 1967 anchor_drift = ( (anchor->pos - anchor->opos) + 1968 (edge2->pos - edge2->opos)) >> 1; 1969 1970 FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 )); 1971 } 1972 else 1973 { 1974 FT_Pos org_pos, org_len, org_center, cur_center, cur_len; 1975 FT_Pos org_left, org_right; 1976 1977 1978 org_pos = edge->opos + anchor_drift; 1979 org_len = edge2->opos - edge->opos; 1980 org_center = org_pos + ( org_len >> 1 ); 1981 1982 cur_len = af_latin2_compute_stem_width( 1983 hints, dim, org_len, 1984 (AF_Edge_Flags)edge->flags, 1985 (AF_Edge_Flags)edge2->flags ); 1986 1987 org_left = org_pos + ((org_len - cur_len) >> 1); 1988 org_right = org_pos + ((org_len + cur_len) >> 1); 1989 1990 FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ", 1991 org_left / 64.0, org_right / 64.0 )); 1992 cur_center = org_center; 1993 1994 if ( edge2->flags & AF_EDGE_DONE ) 1995 { 1996 FT_TRACE5(( "\n" )); 1997 edge->pos = edge2->pos - cur_len; 1998 } 1999 else 2000 { 2001 /* we want to compare several displacement, and choose 2002 * the one that increases fitness while minimizing 2003 * distortion as well 2004 */ 2005 FT_Pos displacements[6], scores[6], org, fit, delta; 2006 FT_UInt count = 0; 2007 2008 /* note: don't even try to fit tiny stems */ 2009 if ( cur_len < 32 ) 2010 { 2011 FT_TRACE5(( "tiny stem\n" )); 2012 goto AlignStem; 2013 } 2014 2015 /* if the span is within a single pixel, don't touch it */ 2016 if ( FT_PIX_FLOOR(org_left) == FT_PIX_CEIL(org_right) ) 2017 { 2018 FT_TRACE5(( "single pixel stem\n" )); 2019 goto AlignStem; 2020 } 2021 2022 if (cur_len <= 96) 2023 { 2024 /* we want to avoid the absolute worst case which is 2025 * when the left and right edges of the span each represent 2026 * about 50% of the gray. we'd better want to change this 2027 * to 25/75%, since this is much more pleasant to the eye with 2028 * very acceptable distortion 2029 */ 2030 FT_Pos frac_left = (org_left) & 63; 2031 FT_Pos frac_right = (org_right) & 63; 2032 2033 if ( frac_left >= 22 && frac_left <= 42 && 2034 frac_right >= 22 && frac_right <= 42 ) 2035 { 2036 org = frac_left; 2037 fit = (org <= 32) ? 16 : 48; 2038 delta = FT_ABS(fit - org); 2039 displacements[count] = fit - org; 2040 scores[count++] = delta; 2041 FT_TRACE5(( "dispA=%.2f (%d) ", (fit - org) / 64.0, delta )); 2042 2043 org = frac_right; 2044 fit = (org <= 32) ? 16 : 48; 2045 delta = FT_ABS(fit - org); 2046 displacements[count] = fit - org; 2047 scores[count++] = delta; 2048 FT_TRACE5(( "dispB=%.2f (%d) ", (fit - org) / 64.0, delta )); 2049 } 2050 } 2051 2052 /* snapping the left edge to the grid */ 2053 org = org_left; 2054 fit = FT_PIX_ROUND(org); 2055 delta = FT_ABS(fit - org); 2056 displacements[count] = fit - org; 2057 scores[count++] = delta; 2058 FT_TRACE5(( "dispC=%.2f (%d) ", (fit - org) / 64.0, delta )); 2059 2060 /* snapping the right edge to the grid */ 2061 org = org_right; 2062 fit = FT_PIX_ROUND(org); 2063 delta = FT_ABS(fit - org); 2064 displacements[count] = fit - org; 2065 scores[count++] = delta; 2066 FT_TRACE5(( "dispD=%.2f (%d) ", (fit - org) / 64.0, delta )); 2067 2068 /* now find the best displacement */ 2069 { 2070 FT_Pos best_score = scores[0]; 2071 FT_Pos best_disp = displacements[0]; 2072 FT_UInt nn; 2073 2074 for (nn = 1; nn < count; nn++) 2075 { 2076 if (scores[nn] < best_score) 2077 { 2078 best_score = scores[nn]; 2079 best_disp = displacements[nn]; 2080 } 2081 } 2082 2083 cur_center = org_center + best_disp; 2084 } 2085 FT_TRACE5(( "\n" )); 2086 } 2087 2088 AlignStem: 2089 edge->pos = cur_center - (cur_len >> 1); 2090 edge2->pos = edge->pos + cur_len; 2091 2092 FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)" 2093 " snapped to (%.2f) and (%.2f)," 2094 " org_len=%.2f cur_len=%.2f\n", 2095 edge-edges, edge->opos / 64.0, 2096 edge2-edges, edge2->opos / 64.0, 2097 edge->pos / 64.0, edge2->pos / 64.0, 2098 org_len / 64.0, cur_len / 64.0 )); 2099 2100 edge->flags |= AF_EDGE_DONE; 2101 edge2->flags |= AF_EDGE_DONE; 2102 2103 if ( edge > edges && edge->pos < edge[-1].pos ) 2104 { 2105 FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n", 2106 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 )); 2107 edge->pos = edge[-1].pos; 2108 } 2109 } 2110 } 2111 2112 /* make sure that lowercase m's maintain their symmetry */ 2113 2114 /* In general, lowercase m's have six vertical edges if they are sans */ 2115 /* serif, or twelve if they are with serifs. This implementation is */ 2116 /* based on that assumption, and seems to work very well with most */ 2117 /* faces. However, if for a certain face this assumption is not */ 2118 /* true, the m is just rendered like before. In addition, any stem */ 2119 /* correction will only be applied to symmetrical glyphs (even if the */ 2120 /* glyph is not an m), so the potential for unwanted distortion is */ 2121 /* relatively low. */ 2122 2123 /* We don't handle horizontal edges since we can't easily assure that */ 2124 /* the third (lowest) stem aligns with the base line; it might end up */ 2125 /* one pixel higher or lower. */ 2126 2127 #if 0 2128 { 2129 FT_Int n_edges = edge_limit - edges; 2130 2131 2132 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 2133 { 2134 AF_Edge edge1, edge2, edge3; 2135 FT_Pos dist1, dist2, span, delta; 2136 2137 2138 if ( n_edges == 6 ) 2139 { 2140 edge1 = edges; 2141 edge2 = edges + 2; 2142 edge3 = edges + 4; 2143 } 2144 else 2145 { 2146 edge1 = edges + 1; 2147 edge2 = edges + 5; 2148 edge3 = edges + 9; 2149 } 2150 2151 dist1 = edge2->opos - edge1->opos; 2152 dist2 = edge3->opos - edge2->opos; 2153 2154 span = dist1 - dist2; 2155 if ( span < 0 ) 2156 span = -span; 2157 2158 if ( span < 8 ) 2159 { 2160 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2161 edge3->pos -= delta; 2162 if ( edge3->link ) 2163 edge3->link->pos -= delta; 2164 2165 /* move the serifs along with the stem */ 2166 if ( n_edges == 12 ) 2167 { 2168 ( edges + 8 )->pos -= delta; 2169 ( edges + 11 )->pos -= delta; 2170 } 2171 2172 edge3->flags |= AF_EDGE_DONE; 2173 if ( edge3->link ) 2174 edge3->link->flags |= AF_EDGE_DONE; 2175 } 2176 } 2177 } 2178 #endif 2179 2180 if ( has_serifs || !anchor ) 2181 { 2182 /* 2183 * now hint the remaining edges (serifs and single) in order 2184 * to complete our processing 2185 */ 2186 for ( edge = edges; edge < edge_limit; edge++ ) 2187 { 2188 FT_Pos delta; 2189 2190 2191 if ( edge->flags & AF_EDGE_DONE ) 2192 continue; 2193 2194 delta = 1000; 2195 2196 if ( edge->serif ) 2197 { 2198 delta = edge->serif->opos - edge->opos; 2199 if ( delta < 0 ) 2200 delta = -delta; 2201 } 2202 2203 if ( delta < 64 + 16 ) 2204 { 2205 af_latin2_align_serif_edge( hints, edge->serif, edge ); 2206 FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)" 2207 " aligned to (%.2f)\n", 2208 edge-edges, edge->opos / 64.0, 2209 edge->serif - edges, edge->serif->opos / 64.0, 2210 edge->pos / 64.0 )); 2211 } 2212 else if ( !anchor ) 2213 { 2214 FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)" 2215 " snapped to (%.2f)\n", 2216 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2217 edge->pos = FT_PIX_ROUND( edge->opos ); 2218 anchor = edge; 2219 } 2220 else 2221 { 2222 AF_Edge before, after; 2223 2224 2225 for ( before = edge - 1; before >= edges; before-- ) 2226 if ( before->flags & AF_EDGE_DONE ) 2227 break; 2228 2229 for ( after = edge + 1; after < edge_limit; after++ ) 2230 if ( after->flags & AF_EDGE_DONE ) 2231 break; 2232 2233 if ( before >= edges && before < edge && 2234 after < edge_limit && after > edge ) 2235 { 2236 if ( after->opos == before->opos ) 2237 edge->pos = before->pos; 2238 else 2239 edge->pos = before->pos + 2240 FT_MulDiv( edge->opos - before->opos, 2241 after->pos - before->pos, 2242 after->opos - before->opos ); 2243 FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)" 2244 " from %d (opos=%.2f)\n", 2245 edge-edges, edge->opos / 64.0, edge->pos / 64.0, 2246 before - edges, before->opos / 64.0 )); 2247 } 2248 else 2249 { 2250 edge->pos = anchor->pos + 2251 ( ( edge->opos - anchor->opos + 16 ) & ~31 ); 2252 2253 FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)" 2254 " snapped to (%.2f)\n", 2255 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2256 } 2257 } 2258 2259 edge->flags |= AF_EDGE_DONE; 2260 2261 if ( edge > edges && edge->pos < edge[-1].pos ) 2262 edge->pos = edge[-1].pos; 2263 2264 if ( edge + 1 < edge_limit && 2265 edge[1].flags & AF_EDGE_DONE && 2266 edge->pos > edge[1].pos ) 2267 edge->pos = edge[1].pos; 2268 } 2269 } 2270 } 2271 2272 2273 static FT_Error 2274 af_latin2_hints_apply( AF_GlyphHints hints, 2275 FT_Outline* outline, 2276 AF_LatinMetrics metrics ) 2277 { 2278 FT_Error error; 2279 int dim; 2280 2281 2282 error = af_glyph_hints_reload( hints, outline ); 2283 if ( error ) 2284 goto Exit; 2285 2286 /* analyze glyph outline */ 2287 #ifdef AF_CONFIG_OPTION_USE_WARPER 2288 if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT || 2289 AF_HINTS_DO_HORIZONTAL( hints ) ) 2290 #else 2291 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2292 #endif 2293 { 2294 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2295 if ( error ) 2296 goto Exit; 2297 } 2298 2299 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2300 { 2301 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT ); 2302 if ( error ) 2303 goto Exit; 2304 2305 af_latin2_hints_compute_blue_edges( hints, metrics ); 2306 } 2307 2308 /* grid-fit the outline */ 2309 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2310 { 2311 #ifdef AF_CONFIG_OPTION_USE_WARPER 2312 if ( ( dim == AF_DIMENSION_HORZ && 2313 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) ) 2314 { 2315 AF_WarperRec warper; 2316 FT_Fixed scale; 2317 FT_Pos delta; 2318 2319 2320 af_warper_compute( &warper, hints, dim, &scale, &delta ); 2321 af_glyph_hints_scale_dim( hints, dim, scale, delta ); 2322 continue; 2323 } 2324 #endif 2325 2326 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2327 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2328 { 2329 af_latin2_hint_edges( hints, (AF_Dimension)dim ); 2330 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim ); 2331 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2332 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2333 } 2334 } 2335 af_glyph_hints_save( hints, outline ); 2336 2337 Exit: 2338 return error; 2339 } 2340 2341 2342 /*************************************************************************/ 2343 /*************************************************************************/ 2344 /***** *****/ 2345 /***** L A T I N S C R I P T C L A S S *****/ 2346 /***** *****/ 2347 /*************************************************************************/ 2348 /*************************************************************************/ 2349 2350 2351 static const AF_Script_UniRangeRec af_latin2_uniranges[] = 2352 { 2353 AF_UNIRANGE_REC( 32UL, 127UL ), /* TODO: Add new Unicode ranges here! */ 2354 AF_UNIRANGE_REC( 160UL, 255UL ), 2355 AF_UNIRANGE_REC( 0UL, 0UL ) 2356 }; 2357 2358 2359 AF_DEFINE_SCRIPT_CLASS( af_latin2_script_class, 2360 AF_SCRIPT_LATIN2, 2361 af_latin2_uniranges, 2362 2363 sizeof ( AF_LatinMetricsRec ), 2364 2365 (AF_Script_InitMetricsFunc) af_latin2_metrics_init, 2366 (AF_Script_ScaleMetricsFunc)af_latin2_metrics_scale, 2367 (AF_Script_DoneMetricsFunc) NULL, 2368 2369 (AF_Script_InitHintsFunc) af_latin2_hints_init, 2370 (AF_Script_ApplyHintsFunc) af_latin2_hints_apply 2371 ) 2372 2373 2374 /* END */ 2375
