1 /***************************************************************************/ 2 /* */ 3 /* aflatin.c */ 4 /* */ 5 /* Auto-fitter hinting routines for latin script (body). */ 6 /* */ 7 /* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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_USE_WARPER 27 #include "afwarp.h" 28 #endif 29 30 FT_LOCAL_DEF( FT_Error ) 31 af_latin2_hints_compute_segments( AF_GlyphHints hints, 32 AF_Dimension dim ); 33 34 FT_LOCAL_DEF( void ) 35 af_latin2_hints_link_segments( AF_GlyphHints hints, 36 AF_Dimension dim ); 37 38 /*************************************************************************/ 39 /*************************************************************************/ 40 /***** *****/ 41 /***** L A T I N G L O B A L M E T R I C S *****/ 42 /***** *****/ 43 /*************************************************************************/ 44 /*************************************************************************/ 45 46 FT_LOCAL_DEF( void ) 47 af_latin2_metrics_init_widths( AF_LatinMetrics metrics, 48 FT_Face face, 49 FT_ULong charcode ) 50 { 51 /* scan the array of segments in each direction */ 52 AF_GlyphHintsRec hints[1]; 53 54 55 af_glyph_hints_init( hints, face->memory ); 56 57 metrics->axis[AF_DIMENSION_HORZ].width_count = 0; 58 metrics->axis[AF_DIMENSION_VERT].width_count = 0; 59 60 { 61 FT_Error error; 62 FT_UInt glyph_index; 63 int dim; 64 AF_LatinMetricsRec dummy[1]; 65 AF_Scaler scaler = &dummy->root.scaler; 66 67 68 glyph_index = FT_Get_Char_Index( face, charcode ); 69 if ( glyph_index == 0 ) 70 goto Exit; 71 72 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 73 if ( error || face->glyph->outline.n_points <= 0 ) 74 goto Exit; 75 76 FT_ZERO( dummy ); 77 78 dummy->units_per_em = metrics->units_per_em; 79 scaler->x_scale = scaler->y_scale = 0x10000L; 80 scaler->x_delta = scaler->y_delta = 0; 81 scaler->face = face; 82 scaler->render_mode = FT_RENDER_MODE_NORMAL; 83 scaler->flags = 0; 84 85 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)dummy ); 86 87 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 88 if ( error ) 89 goto Exit; 90 91 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 92 { 93 AF_LatinAxis axis = &metrics->axis[dim]; 94 AF_AxisHints axhints = &hints->axis[dim]; 95 AF_Segment seg, limit, link; 96 FT_UInt num_widths = 0; 97 98 99 error = af_latin2_hints_compute_segments( hints, 100 (AF_Dimension)dim ); 101 if ( error ) 102 goto Exit; 103 104 af_latin2_hints_link_segments( hints, 105 (AF_Dimension)dim ); 106 107 seg = axhints->segments; 108 limit = seg + axhints->num_segments; 109 110 for ( ; seg < limit; seg++ ) 111 { 112 link = seg->link; 113 114 /* we only consider stem segments there! */ 115 if ( link && link->link == seg && link > seg ) 116 { 117 FT_Pos dist; 118 119 120 dist = seg->pos - link->pos; 121 if ( dist < 0 ) 122 dist = -dist; 123 124 if ( num_widths < AF_LATIN_MAX_WIDTHS ) 125 axis->widths[ num_widths++ ].org = dist; 126 } 127 } 128 129 af_sort_widths( num_widths, axis->widths ); 130 axis->width_count = num_widths; 131 } 132 133 Exit: 134 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 135 { 136 AF_LatinAxis axis = &metrics->axis[dim]; 137 FT_Pos stdw; 138 139 140 stdw = ( axis->width_count > 0 ) 141 ? axis->widths[0].org 142 : AF_LATIN_CONSTANT( metrics, 50 ); 143 144 /* let's try 20% of the smallest width */ 145 axis->edge_distance_threshold = stdw / 5; 146 axis->standard_width = stdw; 147 axis->extra_light = 0; 148 } 149 } 150 151 af_glyph_hints_done( hints ); 152 } 153 154 155 156 #define AF_LATIN_MAX_TEST_CHARACTERS 12 157 158 159 static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES][AF_LATIN_MAX_TEST_CHARACTERS+1] = 160 { 161 "THEZOCQS", 162 "HEZLOCUS", 163 "fijkdbh", 164 "xzroesc", 165 "xzroesc", 166 "pqgjy" 167 }; 168 169 170 static void 171 af_latin2_metrics_init_blues( AF_LatinMetrics metrics, 172 FT_Face face ) 173 { 174 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS]; 175 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS]; 176 FT_Int num_flats; 177 FT_Int num_rounds; 178 FT_Int bb; 179 AF_LatinBlue blue; 180 FT_Error error; 181 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT]; 182 FT_GlyphSlot glyph = face->glyph; 183 184 185 /* we compute the blues simply by loading each character from the */ 186 /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */ 187 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */ 188 189 AF_LOG(( "blue zones computation\n" )); 190 AF_LOG(( "------------------------------------------------\n" )); 191 192 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 193 { 194 const char* p = af_latin2_blue_chars[bb]; 195 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS; 196 FT_Pos* blue_ref; 197 FT_Pos* blue_shoot; 198 199 200 AF_LOG(( "blue %3d: ", bb )); 201 202 num_flats = 0; 203 num_rounds = 0; 204 205 for ( ; p < limit && *p; p++ ) 206 { 207 FT_UInt glyph_index; 208 FT_Int best_point, best_y, best_first, best_last; 209 FT_Vector* points; 210 FT_Bool round; 211 212 213 AF_LOG(( "'%c'", *p )); 214 215 /* load the character in the face -- skip unknown or empty ones */ 216 glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p ); 217 if ( glyph_index == 0 ) 218 continue; 219 220 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 221 if ( error || glyph->outline.n_points <= 0 ) 222 continue; 223 224 /* now compute min or max point indices and coordinates */ 225 points = glyph->outline.points; 226 best_point = -1; 227 best_y = 0; /* make compiler happy */ 228 best_first = 0; /* ditto */ 229 best_last = 0; /* ditto */ 230 231 { 232 FT_Int nn; 233 FT_Int first = 0; 234 FT_Int last = -1; 235 236 237 for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ ) 238 { 239 FT_Int old_best_point = best_point; 240 FT_Int pp; 241 242 243 last = glyph->outline.contours[nn]; 244 245 /* Avoid single-point contours since they are never rasterized. */ 246 /* In some fonts, they correspond to mark attachment points */ 247 /* which are way outside of the glyph's real outline. */ 248 if ( last == first ) 249 continue; 250 251 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 252 { 253 for ( pp = first; pp <= last; pp++ ) 254 if ( best_point < 0 || points[pp].y > best_y ) 255 { 256 best_point = pp; 257 best_y = points[pp].y; 258 } 259 } 260 else 261 { 262 for ( pp = first; pp <= last; pp++ ) 263 if ( best_point < 0 || points[pp].y < best_y ) 264 { 265 best_point = pp; 266 best_y = points[pp].y; 267 } 268 } 269 270 if ( best_point != old_best_point ) 271 { 272 best_first = first; 273 best_last = last; 274 } 275 } 276 AF_LOG(( "%5d", best_y )); 277 } 278 279 /* now check whether the point belongs to a straight or round */ 280 /* segment; we first need to find in which contour the extremum */ 281 /* lies, then inspect its previous and next points */ 282 { 283 FT_Int start, end, prev, next; 284 FT_Pos dist; 285 286 287 /* now look for the previous and next points that are not on the */ 288 /* same Y coordinate. Threshold the `closeness'... */ 289 start = end = best_point; 290 291 do 292 { 293 prev = start-1; 294 if ( prev < best_first ) 295 prev = best_last; 296 297 dist = points[prev].y - best_y; 298 if ( dist < -5 || dist > 5 ) 299 break; 300 301 start = prev; 302 303 } while ( start != best_point ); 304 305 do 306 { 307 next = end+1; 308 if ( next > best_last ) 309 next = best_first; 310 311 dist = points[next].y - best_y; 312 if ( dist < -5 || dist > 5 ) 313 break; 314 315 end = next; 316 317 } while ( end != best_point ); 318 319 /* now, set the `round' flag depending on the segment's kind */ 320 round = FT_BOOL( 321 FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON || 322 FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON ); 323 324 AF_LOG(( "%c ", round ? 'r' : 'f' )); 325 } 326 327 if ( round ) 328 rounds[num_rounds++] = best_y; 329 else 330 flats[num_flats++] = best_y; 331 } 332 333 AF_LOG(( "\n" )); 334 335 if ( num_flats == 0 && num_rounds == 0 ) 336 { 337 /* 338 * we couldn't find a single glyph to compute this blue zone, 339 * we will simply ignore it then 340 */ 341 AF_LOG(( "empty\n" )); 342 continue; 343 } 344 345 /* we have computed the contents of the `rounds' and `flats' tables, */ 346 /* now determine the reference and overshoot position of the blue -- */ 347 /* we simply take the median value after a simple sort */ 348 af_sort_pos( num_rounds, rounds ); 349 af_sort_pos( num_flats, flats ); 350 351 blue = & axis->blues[axis->blue_count]; 352 blue_ref = & blue->ref.org; 353 blue_shoot = & blue->shoot.org; 354 355 axis->blue_count++; 356 357 if ( num_flats == 0 ) 358 { 359 *blue_ref = 360 *blue_shoot = rounds[num_rounds / 2]; 361 } 362 else if ( num_rounds == 0 ) 363 { 364 *blue_ref = 365 *blue_shoot = flats[num_flats / 2]; 366 } 367 else 368 { 369 *blue_ref = flats[num_flats / 2]; 370 *blue_shoot = rounds[num_rounds / 2]; 371 } 372 373 /* there are sometimes problems: if the overshoot position of top */ 374 /* zones is under its reference position, or the opposite for bottom */ 375 /* zones. We must thus check everything there and correct the errors */ 376 if ( *blue_shoot != *blue_ref ) 377 { 378 FT_Pos ref = *blue_ref; 379 FT_Pos shoot = *blue_shoot; 380 FT_Bool over_ref = FT_BOOL( shoot > ref ); 381 382 383 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref ) 384 *blue_shoot = *blue_ref = ( shoot + ref ) / 2; 385 } 386 387 blue->flags = 0; 388 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 389 blue->flags |= AF_LATIN_BLUE_TOP; 390 391 /* 392 * The following flags is used later to adjust the y and x scales 393 * in order to optimize the pixel grid alignment of the top of small 394 * letters. 395 */ 396 if ( bb == AF_LATIN_BLUE_SMALL_TOP ) 397 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT; 398 399 AF_LOG(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot )); 400 } 401 402 return; 403 } 404 405 406 FT_LOCAL_DEF( void ) 407 af_latin2_metrics_check_digits( AF_LatinMetrics metrics, 408 FT_Face face ) 409 { 410 FT_UInt i; 411 FT_Bool started = 0, same_width = 1; 412 FT_Fixed advance, old_advance = 0; 413 414 415 /* check whether all ASCII digits have the same advance width; */ 416 /* digit `0' is 0x30 in all supported charmaps */ 417 for ( i = 0x30; i <= 0x39; i++ ) 418 { 419 FT_UInt glyph_index; 420 421 422 glyph_index = FT_Get_Char_Index( face, i ); 423 if ( glyph_index == 0 ) 424 continue; 425 426 if ( FT_Get_Advance( face, glyph_index, 427 FT_LOAD_NO_SCALE | 428 FT_LOAD_NO_HINTING | 429 FT_LOAD_IGNORE_TRANSFORM, 430 &advance ) ) 431 continue; 432 433 if ( started ) 434 { 435 if ( advance != old_advance ) 436 { 437 same_width = 0; 438 break; 439 } 440 } 441 else 442 { 443 old_advance = advance; 444 started = 1; 445 } 446 } 447 448 metrics->root.digits_have_same_width = same_width; 449 } 450 451 452 FT_LOCAL_DEF( FT_Error ) 453 af_latin2_metrics_init( AF_LatinMetrics metrics, 454 FT_Face face ) 455 { 456 FT_Error error = AF_Err_Ok; 457 FT_CharMap oldmap = face->charmap; 458 FT_UInt ee; 459 460 static const FT_Encoding latin_encodings[] = 461 { 462 FT_ENCODING_UNICODE, 463 FT_ENCODING_APPLE_ROMAN, 464 FT_ENCODING_ADOBE_STANDARD, 465 FT_ENCODING_ADOBE_LATIN_1, 466 FT_ENCODING_NONE /* end of list */ 467 }; 468 469 470 metrics->units_per_em = face->units_per_EM; 471 472 /* do we have a latin charmap in there? */ 473 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ ) 474 { 475 error = FT_Select_Charmap( face, latin_encodings[ee] ); 476 if ( !error ) 477 break; 478 } 479 480 if ( !error ) 481 { 482 /* For now, compute the standard width and height from the `o'. */ 483 af_latin2_metrics_init_widths( metrics, face, 'o' ); 484 af_latin2_metrics_init_blues( metrics, face ); 485 af_latin2_metrics_check_digits( metrics, face ); 486 } 487 488 FT_Set_Charmap( face, oldmap ); 489 return AF_Err_Ok; 490 } 491 492 493 static void 494 af_latin2_metrics_scale_dim( AF_LatinMetrics metrics, 495 AF_Scaler scaler, 496 AF_Dimension dim ) 497 { 498 FT_Fixed scale; 499 FT_Pos delta; 500 AF_LatinAxis axis; 501 FT_UInt nn; 502 503 504 if ( dim == AF_DIMENSION_HORZ ) 505 { 506 scale = scaler->x_scale; 507 delta = scaler->x_delta; 508 } 509 else 510 { 511 scale = scaler->y_scale; 512 delta = scaler->y_delta; 513 } 514 515 axis = &metrics->axis[dim]; 516 517 if ( axis->org_scale == scale && axis->org_delta == delta ) 518 return; 519 520 axis->org_scale = scale; 521 axis->org_delta = delta; 522 523 /* 524 * correct Y scale to optimize the alignment of the top of small 525 * letters to the pixel grid 526 */ 527 if ( dim == AF_DIMENSION_VERT ) 528 { 529 AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT]; 530 AF_LatinBlue blue = NULL; 531 532 533 for ( nn = 0; nn < vaxis->blue_count; nn++ ) 534 { 535 if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT ) 536 { 537 blue = &vaxis->blues[nn]; 538 break; 539 } 540 } 541 542 if ( blue ) 543 { 544 FT_Pos scaled = FT_MulFix( blue->shoot.org, scaler->y_scale ); 545 FT_Pos fitted = ( scaled + 40 ) & ~63; 546 547 #if 1 548 if ( scaled != fitted ) 549 { 550 scale = FT_MulDiv( scale, fitted, scaled ); 551 AF_LOG(( "== scaled x-top = %.2g fitted = %.2g, scaling = %.4g\n", scaled/64.0, fitted/64.0, (fitted*1.0)/scaled )); 552 } 553 #endif 554 } 555 } 556 557 axis->scale = scale; 558 axis->delta = delta; 559 560 if ( dim == AF_DIMENSION_HORZ ) 561 { 562 metrics->root.scaler.x_scale = scale; 563 metrics->root.scaler.x_delta = delta; 564 } 565 else 566 { 567 metrics->root.scaler.y_scale = scale; 568 metrics->root.scaler.y_delta = delta; 569 } 570 571 /* scale the standard widths */ 572 for ( nn = 0; nn < axis->width_count; nn++ ) 573 { 574 AF_Width width = axis->widths + nn; 575 576 577 width->cur = FT_MulFix( width->org, scale ); 578 width->fit = width->cur; 579 } 580 581 /* an extra-light axis corresponds to a standard width that is */ 582 /* smaller than 0.75 pixels */ 583 axis->extra_light = 584 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 ); 585 586 if ( dim == AF_DIMENSION_VERT ) 587 { 588 /* scale the blue zones */ 589 for ( nn = 0; nn < axis->blue_count; nn++ ) 590 { 591 AF_LatinBlue blue = &axis->blues[nn]; 592 FT_Pos dist; 593 594 595 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 596 blue->ref.fit = blue->ref.cur; 597 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 598 blue->shoot.fit = blue->shoot.cur; 599 blue->flags &= ~AF_LATIN_BLUE_ACTIVE; 600 601 /* a blue zone is only active if it is less than 3/4 pixels tall */ 602 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 603 if ( dist <= 48 && dist >= -48 ) 604 { 605 FT_Pos delta1, delta2; 606 607 delta1 = blue->shoot.org - blue->ref.org; 608 delta2 = delta1; 609 if ( delta1 < 0 ) 610 delta2 = -delta2; 611 612 delta2 = FT_MulFix( delta2, scale ); 613 614 if ( delta2 < 32 ) 615 delta2 = 0; 616 else if ( delta2 < 64 ) 617 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 618 else 619 delta2 = FT_PIX_ROUND( delta2 ); 620 621 if ( delta1 < 0 ) 622 delta2 = -delta2; 623 624 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 625 blue->shoot.fit = blue->ref.fit + delta2; 626 627 AF_LOG(( ">> activating blue zone %d: ref.cur=%.2g ref.fit=%.2g shoot.cur=%.2g shoot.fit=%.2g\n", 628 nn, blue->ref.cur/64.0, blue->ref.fit/64.0, 629 blue->shoot.cur/64.0, blue->shoot.fit/64.0 )); 630 631 blue->flags |= AF_LATIN_BLUE_ACTIVE; 632 } 633 } 634 } 635 } 636 637 638 FT_LOCAL_DEF( void ) 639 af_latin2_metrics_scale( AF_LatinMetrics metrics, 640 AF_Scaler scaler ) 641 { 642 metrics->root.scaler.render_mode = scaler->render_mode; 643 metrics->root.scaler.face = scaler->face; 644 645 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 646 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 647 } 648 649 650 /*************************************************************************/ 651 /*************************************************************************/ 652 /***** *****/ 653 /***** L A T I N G L Y P H A N A L Y S I S *****/ 654 /***** *****/ 655 /*************************************************************************/ 656 /*************************************************************************/ 657 658 #define SORT_SEGMENTS 659 660 FT_LOCAL_DEF( FT_Error ) 661 af_latin2_hints_compute_segments( AF_GlyphHints hints, 662 AF_Dimension dim ) 663 { 664 AF_AxisHints axis = &hints->axis[dim]; 665 FT_Memory memory = hints->memory; 666 FT_Error error = AF_Err_Ok; 667 AF_Segment segment = NULL; 668 AF_SegmentRec seg0; 669 AF_Point* contour = hints->contours; 670 AF_Point* contour_limit = contour + hints->num_contours; 671 AF_Direction major_dir, segment_dir; 672 673 674 FT_ZERO( &seg0 ); 675 seg0.score = 32000; 676 seg0.flags = AF_EDGE_NORMAL; 677 678 major_dir = (AF_Direction)FT_ABS( axis->major_dir ); 679 segment_dir = major_dir; 680 681 axis->num_segments = 0; 682 683 /* set up (u,v) in each point */ 684 if ( dim == AF_DIMENSION_HORZ ) 685 { 686 AF_Point point = hints->points; 687 AF_Point limit = point + hints->num_points; 688 689 690 for ( ; point < limit; point++ ) 691 { 692 point->u = point->fx; 693 point->v = point->fy; 694 } 695 } 696 else 697 { 698 AF_Point point = hints->points; 699 AF_Point limit = point + hints->num_points; 700 701 702 for ( ; point < limit; point++ ) 703 { 704 point->u = point->fy; 705 point->v = point->fx; 706 } 707 } 708 709 /* do each contour separately */ 710 for ( ; contour < contour_limit; contour++ ) 711 { 712 AF_Point point = contour[0]; 713 AF_Point start = point; 714 AF_Point last = point->prev; 715 716 717 if ( point == last ) /* skip singletons -- just in case */ 718 continue; 719 720 /* already on an edge ?, backtrack to find its start */ 721 if ( FT_ABS( point->in_dir ) == major_dir ) 722 { 723 point = point->prev; 724 725 while ( point->in_dir == start->in_dir ) 726 point = point->prev; 727 } 728 else /* otherwise, find first segment start, if any */ 729 { 730 while ( FT_ABS( point->out_dir ) != major_dir ) 731 { 732 point = point->next; 733 734 if ( point == start ) 735 goto NextContour; 736 } 737 } 738 739 start = point; 740 741 for (;;) 742 { 743 AF_Point first; 744 FT_Pos min_u, min_v, max_u, max_v; 745 746 /* we're at the start of a new segment */ 747 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir && 748 point->in_dir != point->out_dir ); 749 first = point; 750 751 min_u = max_u = point->u; 752 min_v = max_v = point->v; 753 754 point = point->next; 755 756 while ( point->out_dir == first->out_dir ) 757 { 758 point = point->next; 759 760 if ( point->u < min_u ) 761 min_u = point->u; 762 763 if ( point->u > max_u ) 764 max_u = point->u; 765 } 766 767 if ( point->v < min_v ) 768 min_v = point->v; 769 770 if ( point->v > max_v ) 771 max_v = point->v; 772 773 /* record new segment */ 774 error = af_axis_hints_new_segment( axis, memory, &segment ); 775 if ( error ) 776 goto Exit; 777 778 segment[0] = seg0; 779 segment->dir = first->out_dir; 780 segment->first = first; 781 segment->last = point; 782 segment->contour = contour; 783 segment->pos = (FT_Short)(( min_u + max_u ) >> 1); 784 segment->min_coord = (FT_Short) min_v; 785 segment->max_coord = (FT_Short) max_v; 786 segment->height = (FT_Short)(max_v - min_v); 787 788 /* a segment is round if it doesn't have successive */ 789 /* on-curve points. */ 790 { 791 AF_Point pt = first; 792 AF_Point last = point; 793 AF_Flags f0 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL); 794 AF_Flags f1; 795 796 797 segment->flags &= ~AF_EDGE_ROUND; 798 799 for ( ; pt != last; f0 = f1 ) 800 { 801 pt = pt->next; 802 f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL); 803 804 if ( !f0 && !f1 ) 805 break; 806 807 if ( pt == last ) 808 segment->flags |= AF_EDGE_ROUND; 809 } 810 } 811 812 /* this can happen in the case of a degenerate contour 813 * e.g. a 2-point vertical contour 814 */ 815 if ( point == start ) 816 break; 817 818 /* jump to the start of the next segment, if any */ 819 while ( FT_ABS(point->out_dir) != major_dir ) 820 { 821 point = point->next; 822 823 if ( point == start ) 824 goto NextContour; 825 } 826 } 827 828 NextContour: 829 ; 830 } /* contours */ 831 832 /* now slightly increase the height of segments when this makes */ 833 /* sense -- this is used to better detect and ignore serifs */ 834 { 835 AF_Segment segments = axis->segments; 836 AF_Segment segments_end = segments + axis->num_segments; 837 838 839 for ( segment = segments; segment < segments_end; segment++ ) 840 { 841 AF_Point first = segment->first; 842 AF_Point last = segment->last; 843 AF_Point p; 844 FT_Pos first_v = first->v; 845 FT_Pos last_v = last->v; 846 847 848 if ( first == last ) 849 continue; 850 851 if ( first_v < last_v ) 852 { 853 p = first->prev; 854 if ( p->v < first_v ) 855 segment->height = (FT_Short)( segment->height + 856 ( ( first_v - p->v ) >> 1 ) ); 857 858 p = last->next; 859 if ( p->v > last_v ) 860 segment->height = (FT_Short)( segment->height + 861 ( ( p->v - last_v ) >> 1 ) ); 862 } 863 else 864 { 865 p = first->prev; 866 if ( p->v > first_v ) 867 segment->height = (FT_Short)( segment->height + 868 ( ( p->v - first_v ) >> 1 ) ); 869 870 p = last->next; 871 if ( p->v < last_v ) 872 segment->height = (FT_Short)( segment->height + 873 ( ( last_v - p->v ) >> 1 ) ); 874 } 875 } 876 } 877 878 #ifdef AF_SORT_SEGMENTS 879 /* place all segments with a negative direction to the start 880 * of the array, used to speed up segment linking later... 881 */ 882 { 883 AF_Segment segments = axis->segments; 884 FT_UInt count = axis->num_segments; 885 FT_UInt ii, jj; 886 887 for (ii = 0; ii < count; ii++) 888 { 889 if ( segments[ii].dir > 0 ) 890 { 891 for (jj = ii+1; jj < count; jj++) 892 { 893 if ( segments[jj].dir < 0 ) 894 { 895 AF_SegmentRec tmp; 896 897 tmp = segments[ii]; 898 segments[ii] = segments[jj]; 899 segments[jj] = tmp; 900 901 break; 902 } 903 } 904 905 if ( jj == count ) 906 break; 907 } 908 } 909 axis->mid_segments = ii; 910 } 911 #endif 912 913 Exit: 914 return error; 915 } 916 917 918 FT_LOCAL_DEF( void ) 919 af_latin2_hints_link_segments( AF_GlyphHints hints, 920 AF_Dimension dim ) 921 { 922 AF_AxisHints axis = &hints->axis[dim]; 923 AF_Segment segments = axis->segments; 924 AF_Segment segment_limit = segments + axis->num_segments; 925 #ifdef AF_SORT_SEGMENTS 926 AF_Segment segment_mid = segments + axis->mid_segments; 927 #endif 928 FT_Pos len_threshold, len_score; 929 AF_Segment seg1, seg2; 930 931 932 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 933 if ( len_threshold == 0 ) 934 len_threshold = 1; 935 936 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 ); 937 938 #ifdef AF_SORT_SEGMENTS 939 for ( seg1 = segments; seg1 < segment_mid; seg1++ ) 940 { 941 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last ) 942 continue; 943 944 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ ) 945 #else 946 /* now compare each segment to the others */ 947 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 948 { 949 /* the fake segments are introduced to hint the metrics -- */ 950 /* we must never link them to anything */ 951 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last ) 952 continue; 953 954 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 955 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos ) 956 #endif 957 { 958 FT_Pos pos1 = seg1->pos; 959 FT_Pos pos2 = seg2->pos; 960 FT_Pos dist = pos2 - pos1; 961 962 963 if ( dist < 0 ) 964 continue; 965 966 { 967 FT_Pos min = seg1->min_coord; 968 FT_Pos max = seg1->max_coord; 969 FT_Pos len, score; 970 971 972 if ( min < seg2->min_coord ) 973 min = seg2->min_coord; 974 975 if ( max > seg2->max_coord ) 976 max = seg2->max_coord; 977 978 len = max - min; 979 if ( len >= len_threshold ) 980 { 981 score = dist + len_score / len; 982 if ( score < seg1->score ) 983 { 984 seg1->score = score; 985 seg1->link = seg2; 986 } 987 988 if ( score < seg2->score ) 989 { 990 seg2->score = score; 991 seg2->link = seg1; 992 } 993 } 994 } 995 } 996 } 997 #if 0 998 } 999 #endif 1000 1001 /* now, compute the `serif' segments */ 1002 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1003 { 1004 seg2 = seg1->link; 1005 1006 if ( seg2 ) 1007 { 1008 if ( seg2->link != seg1 ) 1009 { 1010 seg1->link = 0; 1011 seg1->serif = seg2->link; 1012 } 1013 } 1014 } 1015 } 1016 1017 1018 FT_LOCAL_DEF( FT_Error ) 1019 af_latin2_hints_compute_edges( AF_GlyphHints hints, 1020 AF_Dimension dim ) 1021 { 1022 AF_AxisHints axis = &hints->axis[dim]; 1023 FT_Error error = AF_Err_Ok; 1024 FT_Memory memory = hints->memory; 1025 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim]; 1026 1027 AF_Segment segments = axis->segments; 1028 AF_Segment segment_limit = segments + axis->num_segments; 1029 AF_Segment seg; 1030 1031 AF_Direction up_dir; 1032 FT_Fixed scale; 1033 FT_Pos edge_distance_threshold; 1034 FT_Pos segment_length_threshold; 1035 1036 1037 axis->num_edges = 0; 1038 1039 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 1040 : hints->y_scale; 1041 1042 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP 1043 : AF_DIR_RIGHT; 1044 1045 /* 1046 * We want to ignore very small (mostly serif) segments, we do that 1047 * by ignoring those that whose length is less than a given fraction 1048 * of the standard width. If there is no standard width, we ignore 1049 * those that are less than a given size in pixels 1050 * 1051 * also, unlink serif segments that are linked to segments farther 1052 * than 50% of the standard width 1053 */ 1054 if ( dim == AF_DIMENSION_HORZ ) 1055 { 1056 if ( laxis->width_count > 0 ) 1057 segment_length_threshold = (laxis->standard_width * 10 ) >> 4; 1058 else 1059 segment_length_threshold = FT_DivFix( 64, hints->y_scale ); 1060 } 1061 else 1062 segment_length_threshold = 0; 1063 1064 /*********************************************************************/ 1065 /* */ 1066 /* We will begin by generating a sorted table of edges for the */ 1067 /* current direction. To do so, we simply scan each segment and try */ 1068 /* to find an edge in our table that corresponds to its position. */ 1069 /* */ 1070 /* If no edge is found, we create and insert a new edge in the */ 1071 /* sorted table. Otherwise, we simply add the segment to the edge's */ 1072 /* list which will be processed in the second step to compute the */ 1073 /* edge's properties. */ 1074 /* */ 1075 /* Note that the edges table is sorted along the segment/edge */ 1076 /* position. */ 1077 /* */ 1078 /*********************************************************************/ 1079 1080 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1081 scale ); 1082 if ( edge_distance_threshold > 64 / 4 ) 1083 edge_distance_threshold = 64 / 4; 1084 1085 edge_distance_threshold = FT_DivFix( edge_distance_threshold, 1086 scale ); 1087 1088 for ( seg = segments; seg < segment_limit; seg++ ) 1089 { 1090 AF_Edge found = 0; 1091 FT_Int ee; 1092 1093 1094 if ( seg->height < segment_length_threshold ) 1095 continue; 1096 1097 /* A special case for serif edges: If they are smaller than */ 1098 /* 1.5 pixels we ignore them. */ 1099 if ( seg->serif ) 1100 { 1101 FT_Pos dist = seg->serif->pos - seg->pos; 1102 1103 if (dist < 0) 1104 dist = -dist; 1105 1106 if (dist >= laxis->standard_width >> 1) 1107 { 1108 /* unlink this serif, it is too distant from its reference stem */ 1109 seg->serif = NULL; 1110 } 1111 else if ( 2*seg->height < 3 * segment_length_threshold ) 1112 continue; 1113 } 1114 1115 /* look for an edge corresponding to the segment */ 1116 for ( ee = 0; ee < axis->num_edges; ee++ ) 1117 { 1118 AF_Edge edge = axis->edges + ee; 1119 FT_Pos dist; 1120 1121 1122 dist = seg->pos - edge->fpos; 1123 if ( dist < 0 ) 1124 dist = -dist; 1125 1126 if ( dist < edge_distance_threshold && edge->dir == seg->dir ) 1127 { 1128 found = edge; 1129 break; 1130 } 1131 } 1132 1133 if ( !found ) 1134 { 1135 AF_Edge edge; 1136 1137 1138 /* insert a new edge in the list and */ 1139 /* sort according to the position */ 1140 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, memory, &edge ); 1141 if ( error ) 1142 goto Exit; 1143 1144 /* add the segment to the new edge's list */ 1145 FT_ZERO( edge ); 1146 1147 edge->first = seg; 1148 edge->last = seg; 1149 edge->fpos = seg->pos; 1150 edge->dir = seg->dir; 1151 edge->opos = edge->pos = FT_MulFix( seg->pos, scale ); 1152 seg->edge_next = seg; 1153 } 1154 else 1155 { 1156 /* if an edge was found, simply add the segment to the edge's */ 1157 /* list */ 1158 seg->edge_next = found->first; 1159 found->last->edge_next = seg; 1160 found->last = seg; 1161 } 1162 } 1163 1164 1165 /*********************************************************************/ 1166 /* */ 1167 /* Good, we will now compute each edge's properties according to */ 1168 /* segments found on its position. Basically, these are: */ 1169 /* */ 1170 /* - edge's main direction */ 1171 /* - stem edge, serif edge or both (which defaults to stem then) */ 1172 /* - rounded edge, straight or both (which defaults to straight) */ 1173 /* - link for edge */ 1174 /* */ 1175 /*********************************************************************/ 1176 1177 /* first of all, set the `edge' field in each segment -- this is */ 1178 /* required in order to compute edge links */ 1179 1180 /* 1181 * Note that removing this loop and setting the `edge' field of each 1182 * segment directly in the code above slows down execution speed for 1183 * some reasons on platforms like the Sun. 1184 */ 1185 { 1186 AF_Edge edges = axis->edges; 1187 AF_Edge edge_limit = edges + axis->num_edges; 1188 AF_Edge edge; 1189 1190 1191 for ( edge = edges; edge < edge_limit; edge++ ) 1192 { 1193 seg = edge->first; 1194 if ( seg ) 1195 do 1196 { 1197 seg->edge = edge; 1198 seg = seg->edge_next; 1199 1200 } while ( seg != edge->first ); 1201 } 1202 1203 /* now, compute each edge properties */ 1204 for ( edge = edges; edge < edge_limit; edge++ ) 1205 { 1206 FT_Int is_round = 0; /* does it contain round segments? */ 1207 FT_Int is_straight = 0; /* does it contain straight segments? */ 1208 FT_Pos ups = 0; /* number of upwards segments */ 1209 FT_Pos downs = 0; /* number of downwards segments */ 1210 1211 1212 seg = edge->first; 1213 1214 do 1215 { 1216 FT_Bool is_serif; 1217 1218 1219 /* check for roundness of segment */ 1220 if ( seg->flags & AF_EDGE_ROUND ) 1221 is_round++; 1222 else 1223 is_straight++; 1224 1225 /* check for segment direction */ 1226 if ( seg->dir == up_dir ) 1227 ups += seg->max_coord-seg->min_coord; 1228 else 1229 downs += seg->max_coord-seg->min_coord; 1230 1231 /* check for links -- if seg->serif is set, then seg->link must */ 1232 /* be ignored */ 1233 is_serif = (FT_Bool)( seg->serif && 1234 seg->serif->edge && 1235 seg->serif->edge != edge ); 1236 1237 if ( ( seg->link && seg->link->edge != NULL ) || is_serif ) 1238 { 1239 AF_Edge edge2; 1240 AF_Segment seg2; 1241 1242 1243 edge2 = edge->link; 1244 seg2 = seg->link; 1245 1246 if ( is_serif ) 1247 { 1248 seg2 = seg->serif; 1249 edge2 = edge->serif; 1250 } 1251 1252 if ( edge2 ) 1253 { 1254 FT_Pos edge_delta; 1255 FT_Pos seg_delta; 1256 1257 1258 edge_delta = edge->fpos - edge2->fpos; 1259 if ( edge_delta < 0 ) 1260 edge_delta = -edge_delta; 1261 1262 seg_delta = seg->pos - seg2->pos; 1263 if ( seg_delta < 0 ) 1264 seg_delta = -seg_delta; 1265 1266 if ( seg_delta < edge_delta ) 1267 edge2 = seg2->edge; 1268 } 1269 else 1270 edge2 = seg2->edge; 1271 1272 if ( is_serif ) 1273 { 1274 edge->serif = edge2; 1275 edge2->flags |= AF_EDGE_SERIF; 1276 } 1277 else 1278 edge->link = edge2; 1279 } 1280 1281 seg = seg->edge_next; 1282 1283 } while ( seg != edge->first ); 1284 1285 /* set the round/straight flags */ 1286 edge->flags = AF_EDGE_NORMAL; 1287 1288 if ( is_round > 0 && is_round >= is_straight ) 1289 edge->flags |= AF_EDGE_ROUND; 1290 1291 #if 0 1292 /* set the edge's main direction */ 1293 edge->dir = AF_DIR_NONE; 1294 1295 if ( ups > downs ) 1296 edge->dir = (FT_Char)up_dir; 1297 1298 else if ( ups < downs ) 1299 edge->dir = (FT_Char)-up_dir; 1300 1301 else if ( ups == downs ) 1302 edge->dir = 0; /* both up and down! */ 1303 #endif 1304 1305 /* gets rid of serifs if link is set */ 1306 /* XXX: This gets rid of many unpleasant artefacts! */ 1307 /* Example: the `c' in cour.pfa at size 13 */ 1308 1309 if ( edge->serif && edge->link ) 1310 edge->serif = 0; 1311 } 1312 } 1313 1314 Exit: 1315 return error; 1316 } 1317 1318 1319 FT_LOCAL_DEF( FT_Error ) 1320 af_latin2_hints_detect_features( AF_GlyphHints hints, 1321 AF_Dimension dim ) 1322 { 1323 FT_Error error; 1324 1325 1326 error = af_latin2_hints_compute_segments( hints, dim ); 1327 if ( !error ) 1328 { 1329 af_latin2_hints_link_segments( hints, dim ); 1330 1331 error = af_latin2_hints_compute_edges( hints, dim ); 1332 } 1333 return error; 1334 } 1335 1336 1337 FT_LOCAL_DEF( void ) 1338 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints, 1339 AF_LatinMetrics metrics ) 1340 { 1341 AF_AxisHints axis = &hints->axis[ AF_DIMENSION_VERT ]; 1342 AF_Edge edge = axis->edges; 1343 AF_Edge edge_limit = edge + axis->num_edges; 1344 AF_LatinAxis latin = &metrics->axis[ AF_DIMENSION_VERT ]; 1345 FT_Fixed scale = latin->scale; 1346 FT_Pos best_dist0; /* initial threshold */ 1347 1348 1349 /* compute the initial threshold as a fraction of the EM size */ 1350 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1351 1352 if ( best_dist0 > 64 / 2 ) 1353 best_dist0 = 64 / 2; 1354 1355 /* compute which blue zones are active, i.e. have their scaled */ 1356 /* size < 3/4 pixels */ 1357 1358 /* for each horizontal edge search the blue zone which is closest */ 1359 for ( ; edge < edge_limit; edge++ ) 1360 { 1361 FT_Int bb; 1362 AF_Width best_blue = NULL; 1363 FT_Pos best_dist = best_dist0; 1364 1365 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 1366 { 1367 AF_LatinBlue blue = latin->blues + bb; 1368 FT_Bool is_top_blue, is_major_dir; 1369 1370 1371 /* skip inactive blue zones (i.e., those that are too small) */ 1372 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) ) 1373 continue; 1374 1375 /* if it is a top zone, check for right edges -- if it is a bottom */ 1376 /* zone, check for left edges */ 1377 /* */ 1378 /* of course, that's for TrueType */ 1379 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 ); 1380 is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); 1381 1382 /* if it is a top zone, the edge must be against the major */ 1383 /* direction; if it is a bottom zone, it must be in the major */ 1384 /* direction */ 1385 if ( is_top_blue ^ is_major_dir ) 1386 { 1387 FT_Pos dist; 1388 AF_Width compare; 1389 1390 1391 /* if it's a rounded edge, compare it to the overshoot position */ 1392 /* if it's a flat edge, compare it to the reference position */ 1393 if ( edge->flags & AF_EDGE_ROUND ) 1394 compare = &blue->shoot; 1395 else 1396 compare = &blue->ref; 1397 1398 dist = edge->fpos - compare->org; 1399 if (dist < 0) 1400 dist = -dist; 1401 1402 dist = FT_MulFix( dist, scale ); 1403 if ( dist < best_dist ) 1404 { 1405 best_dist = dist; 1406 best_blue = compare; 1407 } 1408 1409 #if 0 1410 /* now, compare it to the overshoot position if the edge is */ 1411 /* rounded, and if the edge is over the reference position of a */ 1412 /* top zone, or under the reference position of a bottom zone */ 1413 if ( edge->flags & AF_EDGE_ROUND && dist != 0 ) 1414 { 1415 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org ); 1416 1417 1418 if ( is_top_blue ^ is_under_ref ) 1419 { 1420 blue = latin->blues + bb; 1421 dist = edge->fpos - blue->shoot.org; 1422 if ( dist < 0 ) 1423 dist = -dist; 1424 1425 dist = FT_MulFix( dist, scale ); 1426 if ( dist < best_dist ) 1427 { 1428 best_dist = dist; 1429 best_blue = & blue->shoot; 1430 } 1431 } 1432 } 1433 #endif 1434 } 1435 } 1436 1437 if ( best_blue ) 1438 edge->blue_edge = best_blue; 1439 } 1440 } 1441 1442 1443 static FT_Error 1444 af_latin2_hints_init( AF_GlyphHints hints, 1445 AF_LatinMetrics metrics ) 1446 { 1447 FT_Render_Mode mode; 1448 FT_UInt32 scaler_flags, other_flags; 1449 FT_Face face = metrics->root.scaler.face; 1450 1451 1452 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics ); 1453 1454 /* 1455 * correct x_scale and y_scale if needed, since they may have 1456 * been modified `af_latin2_metrics_scale_dim' above 1457 */ 1458 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1459 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1460 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1461 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1462 1463 /* compute flags depending on render mode, etc. */ 1464 mode = metrics->root.scaler.render_mode; 1465 1466 #if 0 /* #ifdef AF_USE_WARPER */ 1467 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1468 { 1469 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1470 } 1471 #endif 1472 1473 scaler_flags = hints->scaler_flags; 1474 other_flags = 0; 1475 1476 /* 1477 * We snap the width of vertical stems for the monochrome and 1478 * horizontal LCD rendering targets only. 1479 */ 1480 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1481 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1482 1483 /* 1484 * We snap the width of horizontal stems for the monochrome and 1485 * vertical LCD rendering targets only. 1486 */ 1487 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1488 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1489 1490 /* 1491 * We adjust stems to full pixels only if we don't use the `light' mode. 1492 */ 1493 if ( mode != FT_RENDER_MODE_LIGHT ) 1494 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1495 1496 if ( mode == FT_RENDER_MODE_MONO ) 1497 other_flags |= AF_LATIN_HINTS_MONO; 1498 1499 /* 1500 * In `light' hinting mode we disable horizontal hinting completely. 1501 * We also do it if the face is italic. 1502 */ 1503 if ( mode == FT_RENDER_MODE_LIGHT || 1504 (face->style_flags & FT_STYLE_FLAG_ITALIC) != 0 ) 1505 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL; 1506 1507 hints->scaler_flags = scaler_flags; 1508 hints->other_flags = other_flags; 1509 1510 return 0; 1511 } 1512 1513 1514 /*************************************************************************/ 1515 /*************************************************************************/ 1516 /***** *****/ 1517 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/ 1518 /***** *****/ 1519 /*************************************************************************/ 1520 /*************************************************************************/ 1521 1522 /* snap a given width in scaled coordinates to one of the */ 1523 /* current standard widths */ 1524 1525 static FT_Pos 1526 af_latin2_snap_width( AF_Width widths, 1527 FT_Int count, 1528 FT_Pos width ) 1529 { 1530 int n; 1531 FT_Pos best = 64 + 32 + 2; 1532 FT_Pos reference = width; 1533 FT_Pos scaled; 1534 1535 1536 for ( n = 0; n < count; n++ ) 1537 { 1538 FT_Pos w; 1539 FT_Pos dist; 1540 1541 1542 w = widths[n].cur; 1543 dist = width - w; 1544 if ( dist < 0 ) 1545 dist = -dist; 1546 if ( dist < best ) 1547 { 1548 best = dist; 1549 reference = w; 1550 } 1551 } 1552 1553 scaled = FT_PIX_ROUND( reference ); 1554 1555 if ( width >= reference ) 1556 { 1557 if ( width < scaled + 48 ) 1558 width = reference; 1559 } 1560 else 1561 { 1562 if ( width > scaled - 48 ) 1563 width = reference; 1564 } 1565 1566 return width; 1567 } 1568 1569 1570 /* compute the snapped width of a given stem */ 1571 1572 static FT_Pos 1573 af_latin2_compute_stem_width( AF_GlyphHints hints, 1574 AF_Dimension dim, 1575 FT_Pos width, 1576 AF_Edge_Flags base_flags, 1577 AF_Edge_Flags stem_flags ) 1578 { 1579 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics; 1580 AF_LatinAxis axis = & metrics->axis[dim]; 1581 FT_Pos dist = width; 1582 FT_Int sign = 0; 1583 FT_Int vertical = ( dim == AF_DIMENSION_VERT ); 1584 1585 1586 FT_UNUSED(base_flags); 1587 1588 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) || 1589 axis->extra_light ) 1590 return width; 1591 1592 if ( dist < 0 ) 1593 { 1594 dist = -width; 1595 sign = 1; 1596 } 1597 1598 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1599 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1600 { 1601 /* smooth hinting process: very lightly quantize the stem width */ 1602 1603 /* leave the widths of serifs alone */ 1604 1605 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) ) 1606 goto Done_Width; 1607 1608 #if 0 1609 else if ( ( base_flags & AF_EDGE_ROUND ) ) 1610 { 1611 if ( dist < 80 ) 1612 dist = 64; 1613 } 1614 else if ( dist < 56 ) 1615 dist = 56; 1616 #endif 1617 if ( axis->width_count > 0 ) 1618 { 1619 FT_Pos delta; 1620 1621 1622 /* compare to standard width */ 1623 if ( axis->width_count > 0 ) 1624 { 1625 delta = dist - axis->widths[0].cur; 1626 1627 if ( delta < 0 ) 1628 delta = -delta; 1629 1630 if ( delta < 40 ) 1631 { 1632 dist = axis->widths[0].cur; 1633 if ( dist < 48 ) 1634 dist = 48; 1635 1636 goto Done_Width; 1637 } 1638 } 1639 1640 if ( dist < 3 * 64 ) 1641 { 1642 delta = dist & 63; 1643 dist &= -64; 1644 1645 if ( delta < 10 ) 1646 dist += delta; 1647 1648 else if ( delta < 32 ) 1649 dist += 10; 1650 1651 else if ( delta < 54 ) 1652 dist += 54; 1653 1654 else 1655 dist += delta; 1656 } 1657 else 1658 dist = ( dist + 32 ) & ~63; 1659 } 1660 } 1661 else 1662 { 1663 /* strong hinting process: snap the stem width to integer pixels */ 1664 FT_Pos org_dist = dist; 1665 1666 1667 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist ); 1668 1669 if ( vertical ) 1670 { 1671 /* in the case of vertical hinting, always round */ 1672 /* the stem heights to integer pixels */ 1673 1674 if ( dist >= 64 ) 1675 dist = ( dist + 16 ) & ~63; 1676 else 1677 dist = 64; 1678 } 1679 else 1680 { 1681 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1682 { 1683 /* monochrome horizontal hinting: snap widths to integer pixels */ 1684 /* with a different threshold */ 1685 1686 if ( dist < 64 ) 1687 dist = 64; 1688 else 1689 dist = ( dist + 32 ) & ~63; 1690 } 1691 else 1692 { 1693 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1694 /* approach: we strengthen small stems, round stems whose size */ 1695 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1696 1697 if ( dist < 48 ) 1698 dist = ( dist + 64 ) >> 1; 1699 1700 else if ( dist < 128 ) 1701 { 1702 /* We only round to an integer width if the corresponding */ 1703 /* distortion is less than 1/4 pixel. Otherwise this */ 1704 /* makes everything worse since the diagonals, which are */ 1705 /* not hinted, appear a lot bolder or thinner than the */ 1706 /* vertical stems. */ 1707 1708 FT_Int delta; 1709 1710 1711 dist = ( dist + 22 ) & ~63; 1712 delta = dist - org_dist; 1713 if ( delta < 0 ) 1714 delta = -delta; 1715 1716 if (delta >= 16) 1717 { 1718 dist = org_dist; 1719 if ( dist < 48 ) 1720 dist = ( dist + 64 ) >> 1; 1721 } 1722 } 1723 else 1724 /* round otherwise to prevent color fringes in LCD mode */ 1725 dist = ( dist + 32 ) & ~63; 1726 } 1727 } 1728 } 1729 1730 Done_Width: 1731 if ( sign ) 1732 dist = -dist; 1733 1734 return dist; 1735 } 1736 1737 1738 /* align one stem edge relative to the previous stem edge */ 1739 1740 static void 1741 af_latin2_align_linked_edge( AF_GlyphHints hints, 1742 AF_Dimension dim, 1743 AF_Edge base_edge, 1744 AF_Edge stem_edge ) 1745 { 1746 FT_Pos dist = stem_edge->opos - base_edge->opos; 1747 1748 FT_Pos fitted_width = af_latin2_compute_stem_width( 1749 hints, dim, dist, 1750 (AF_Edge_Flags)base_edge->flags, 1751 (AF_Edge_Flags)stem_edge->flags ); 1752 1753 1754 stem_edge->pos = base_edge->pos + fitted_width; 1755 1756 AF_LOG(( "LINK: edge %d (opos=%.2f) linked to (%.2f), " 1757 "dist was %.2f, now %.2f\n", 1758 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0, 1759 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 )); 1760 } 1761 1762 1763 static void 1764 af_latin2_align_serif_edge( AF_GlyphHints hints, 1765 AF_Edge base, 1766 AF_Edge serif ) 1767 { 1768 FT_UNUSED( hints ); 1769 1770 serif->pos = base->pos + (serif->opos - base->opos); 1771 } 1772 1773 1774 /*************************************************************************/ 1775 /*************************************************************************/ 1776 /*************************************************************************/ 1777 /**** ****/ 1778 /**** E D G E H I N T I N G ****/ 1779 /**** ****/ 1780 /*************************************************************************/ 1781 /*************************************************************************/ 1782 /*************************************************************************/ 1783 1784 1785 FT_LOCAL_DEF( void ) 1786 af_latin2_hint_edges( AF_GlyphHints hints, 1787 AF_Dimension dim ) 1788 { 1789 AF_AxisHints axis = &hints->axis[dim]; 1790 AF_Edge edges = axis->edges; 1791 AF_Edge edge_limit = edges + axis->num_edges; 1792 AF_Edge edge; 1793 AF_Edge anchor = 0; 1794 FT_Int has_serifs = 0; 1795 FT_Pos anchor_drift = 0; 1796 1797 1798 1799 AF_LOG(( "==== hinting %s edges =====\n", dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" )); 1800 1801 /* we begin by aligning all stems relative to the blue zone */ 1802 /* if needed -- that's only for horizontal edges */ 1803 1804 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) ) 1805 { 1806 for ( edge = edges; edge < edge_limit; edge++ ) 1807 { 1808 AF_Width blue; 1809 AF_Edge edge1, edge2; 1810 1811 1812 if ( edge->flags & AF_EDGE_DONE ) 1813 continue; 1814 1815 blue = edge->blue_edge; 1816 edge1 = NULL; 1817 edge2 = edge->link; 1818 1819 if ( blue ) 1820 { 1821 edge1 = edge; 1822 } 1823 else if ( edge2 && edge2->blue_edge ) 1824 { 1825 blue = edge2->blue_edge; 1826 edge1 = edge2; 1827 edge2 = edge; 1828 } 1829 1830 if ( !edge1 ) 1831 continue; 1832 1833 AF_LOG(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), " 1834 "was (%.2f)\n", 1835 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0, 1836 edge1->pos / 64.0 )); 1837 1838 edge1->pos = blue->fit; 1839 edge1->flags |= AF_EDGE_DONE; 1840 1841 if ( edge2 && !edge2->blue_edge ) 1842 { 1843 af_latin2_align_linked_edge( hints, dim, edge1, edge2 ); 1844 edge2->flags |= AF_EDGE_DONE; 1845 } 1846 1847 if ( !anchor ) 1848 { 1849 anchor = edge; 1850 1851 anchor_drift = (anchor->pos - anchor->opos); 1852 if (edge2) 1853 anchor_drift = (anchor_drift + (edge2->pos - edge2->opos)) >> 1; 1854 } 1855 } 1856 } 1857 1858 /* now we will align all stem edges, trying to maintain the */ 1859 /* relative order of stems in the glyph */ 1860 for ( edge = edges; edge < edge_limit; edge++ ) 1861 { 1862 AF_Edge edge2; 1863 1864 1865 if ( edge->flags & AF_EDGE_DONE ) 1866 continue; 1867 1868 /* skip all non-stem edges */ 1869 edge2 = edge->link; 1870 if ( !edge2 ) 1871 { 1872 has_serifs++; 1873 continue; 1874 } 1875 1876 /* now align the stem */ 1877 1878 /* this should not happen, but it's better to be safe */ 1879 if ( edge2->blue_edge ) 1880 { 1881 AF_LOG(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1882 1883 af_latin2_align_linked_edge( hints, dim, edge2, edge ); 1884 edge->flags |= AF_EDGE_DONE; 1885 continue; 1886 } 1887 1888 if ( !anchor ) 1889 { 1890 FT_Pos org_len, org_center, cur_len; 1891 FT_Pos cur_pos1, error1, error2, u_off, d_off; 1892 1893 1894 org_len = edge2->opos - edge->opos; 1895 cur_len = af_latin2_compute_stem_width( 1896 hints, dim, org_len, 1897 (AF_Edge_Flags)edge->flags, 1898 (AF_Edge_Flags)edge2->flags ); 1899 if ( cur_len <= 64 ) 1900 u_off = d_off = 32; 1901 else 1902 { 1903 u_off = 38; 1904 d_off = 26; 1905 } 1906 1907 if ( cur_len < 96 ) 1908 { 1909 org_center = edge->opos + ( org_len >> 1 ); 1910 1911 cur_pos1 = FT_PIX_ROUND( org_center ); 1912 1913 error1 = org_center - ( cur_pos1 - u_off ); 1914 if ( error1 < 0 ) 1915 error1 = -error1; 1916 1917 error2 = org_center - ( cur_pos1 + d_off ); 1918 if ( error2 < 0 ) 1919 error2 = -error2; 1920 1921 if ( error1 < error2 ) 1922 cur_pos1 -= u_off; 1923 else 1924 cur_pos1 += d_off; 1925 1926 edge->pos = cur_pos1 - cur_len / 2; 1927 edge2->pos = edge->pos + cur_len; 1928 } 1929 else 1930 edge->pos = FT_PIX_ROUND( edge->opos ); 1931 1932 AF_LOG(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f) " 1933 "snapped to (%.2f) (%.2f)\n", 1934 edge-edges, edge->opos / 64.0, 1935 edge2-edges, edge2->opos / 64.0, 1936 edge->pos / 64.0, edge2->pos / 64.0 )); 1937 anchor = edge; 1938 1939 edge->flags |= AF_EDGE_DONE; 1940 1941 af_latin2_align_linked_edge( hints, dim, edge, edge2 ); 1942 1943 edge2->flags |= AF_EDGE_DONE; 1944 1945 anchor_drift = ( (anchor->pos - anchor->opos) + 1946 (edge2->pos - edge2->opos)) >> 1; 1947 1948 AF_LOG(( "DRIFT: %.2f\n", anchor_drift/64.0 )); 1949 } 1950 else 1951 { 1952 FT_Pos org_pos, org_len, org_center, cur_center, cur_len; 1953 FT_Pos org_left, org_right; 1954 1955 1956 org_pos = edge->opos + anchor_drift; 1957 org_len = edge2->opos - edge->opos; 1958 org_center = org_pos + ( org_len >> 1 ); 1959 1960 cur_len = af_latin2_compute_stem_width( 1961 hints, dim, org_len, 1962 (AF_Edge_Flags)edge->flags, 1963 (AF_Edge_Flags)edge2->flags ); 1964 1965 org_left = org_pos + ((org_len - cur_len) >> 1); 1966 org_right = org_pos + ((org_len + cur_len) >> 1); 1967 1968 AF_LOG(( "ALIGN: left=%.2f right=%.2f ", org_left/64.0, org_right/64.0 )); 1969 cur_center = org_center; 1970 1971 if ( edge2->flags & AF_EDGE_DONE ) 1972 { 1973 AF_LOG(( "\n" )); 1974 edge->pos = edge2->pos - cur_len; 1975 } 1976 else 1977 { 1978 /* we want to compare several displacement, and choose 1979 * the one that increases fitness while minimizing 1980 * distortion as well 1981 */ 1982 FT_Pos displacements[6], scores[6], org, fit, delta; 1983 FT_UInt count = 0; 1984 1985 /* note: don't even try to fit tiny stems */ 1986 if ( cur_len < 32 ) 1987 { 1988 AF_LOG(( "tiny stem\n" )); 1989 goto AlignStem; 1990 } 1991 1992 /* if the span is within a single pixel, don't touch it */ 1993 if ( FT_PIX_FLOOR(org_left) == FT_PIX_CEIL(org_right) ) 1994 { 1995 AF_LOG(( "single pixel stem\n" )); 1996 goto AlignStem; 1997 } 1998 1999 if (cur_len <= 96) 2000 { 2001 /* we want to avoid the absolute worst case which is 2002 * when the left and right edges of the span each represent 2003 * about 50% of the gray. we'd better want to change this 2004 * to 25/75%, since this is much more pleasant to the eye with 2005 * very acceptable distortion 2006 */ 2007 FT_Pos frac_left = (org_left) & 63; 2008 FT_Pos frac_right = (org_right) & 63; 2009 2010 if ( frac_left >= 22 && frac_left <= 42 && 2011 frac_right >= 22 && frac_right <= 42 ) 2012 { 2013 org = frac_left; 2014 fit = (org <= 32) ? 16 : 48; 2015 delta = FT_ABS(fit - org); 2016 displacements[count] = fit - org; 2017 scores[count++] = delta; 2018 AF_LOG(( "dispA=%.2f (%d) ", (fit - org)/64.0, delta )); 2019 2020 org = frac_right; 2021 fit = (org <= 32) ? 16 : 48; 2022 delta = FT_ABS(fit - org); 2023 displacements[count] = fit - org; 2024 scores[count++] = delta; 2025 AF_LOG(( "dispB=%.2f (%d) ", (fit - org)/64.0, delta )); 2026 } 2027 } 2028 2029 /* snapping the left edge to the grid */ 2030 org = org_left; 2031 fit = FT_PIX_ROUND(org); 2032 delta = FT_ABS(fit - org); 2033 displacements[count] = fit - org; 2034 scores[count++] = delta; 2035 AF_LOG(( "dispC=%.2f (%d) ", (fit - org)/64.0, delta )); 2036 2037 /* snapping the right edge to the grid */ 2038 org = org_right; 2039 fit = FT_PIX_ROUND(org); 2040 delta = FT_ABS(fit - org); 2041 displacements[count] = fit - org; 2042 scores[count++] = delta; 2043 AF_LOG(( "dispD=%.2f (%d) ", (fit - org)/64.0, delta )); 2044 2045 /* now find the best displacement */ 2046 { 2047 FT_Pos best_score = scores[0]; 2048 FT_Pos best_disp = displacements[0]; 2049 FT_UInt nn; 2050 2051 for (nn = 1; nn < count; nn++) 2052 { 2053 if (scores[nn] < best_score) 2054 { 2055 best_score = scores[nn]; 2056 best_disp = displacements[nn]; 2057 } 2058 } 2059 2060 cur_center = org_center + best_disp; 2061 } 2062 AF_LOG(( "\n" )); 2063 } 2064 2065 AlignStem: 2066 edge->pos = cur_center - (cur_len >> 1); 2067 edge2->pos = edge->pos + cur_len; 2068 2069 AF_LOG(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f) " 2070 "snapped to (%.2f) and (%.2f), org_len = %.2f cur_len=%.2f\n", 2071 edge-edges, edge->opos / 64.0, 2072 edge2-edges, edge2->opos / 64.0, 2073 edge->pos / 64.0, edge2->pos / 64.0, 2074 org_len / 64.0, cur_len / 64.0 )); 2075 2076 edge->flags |= AF_EDGE_DONE; 2077 edge2->flags |= AF_EDGE_DONE; 2078 2079 if ( edge > edges && edge->pos < edge[-1].pos ) 2080 { 2081 AF_LOG(( "BOUND: %d (pos=%.2f) to (%.2f)\n", 2082 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 )); 2083 edge->pos = edge[-1].pos; 2084 } 2085 } 2086 } 2087 2088 /* make sure that lowercase m's maintain their symmetry */ 2089 2090 /* In general, lowercase m's have six vertical edges if they are sans */ 2091 /* serif, or twelve if they are with serifs. This implementation is */ 2092 /* based on that assumption, and seems to work very well with most */ 2093 /* faces. However, if for a certain face this assumption is not */ 2094 /* true, the m is just rendered like before. In addition, any stem */ 2095 /* correction will only be applied to symmetrical glyphs (even if the */ 2096 /* glyph is not an m), so the potential for unwanted distortion is */ 2097 /* relatively low. */ 2098 2099 /* We don't handle horizontal edges since we can't easily assure that */ 2100 /* the third (lowest) stem aligns with the base line; it might end up */ 2101 /* one pixel higher or lower. */ 2102 2103 #if 0 2104 { 2105 FT_Int n_edges = edge_limit - edges; 2106 2107 2108 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 2109 { 2110 AF_Edge edge1, edge2, edge3; 2111 FT_Pos dist1, dist2, span, delta; 2112 2113 2114 if ( n_edges == 6 ) 2115 { 2116 edge1 = edges; 2117 edge2 = edges + 2; 2118 edge3 = edges + 4; 2119 } 2120 else 2121 { 2122 edge1 = edges + 1; 2123 edge2 = edges + 5; 2124 edge3 = edges + 9; 2125 } 2126 2127 dist1 = edge2->opos - edge1->opos; 2128 dist2 = edge3->opos - edge2->opos; 2129 2130 span = dist1 - dist2; 2131 if ( span < 0 ) 2132 span = -span; 2133 2134 if ( span < 8 ) 2135 { 2136 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2137 edge3->pos -= delta; 2138 if ( edge3->link ) 2139 edge3->link->pos -= delta; 2140 2141 /* move the serifs along with the stem */ 2142 if ( n_edges == 12 ) 2143 { 2144 ( edges + 8 )->pos -= delta; 2145 ( edges + 11 )->pos -= delta; 2146 } 2147 2148 edge3->flags |= AF_EDGE_DONE; 2149 if ( edge3->link ) 2150 edge3->link->flags |= AF_EDGE_DONE; 2151 } 2152 } 2153 } 2154 #endif 2155 2156 if ( has_serifs || !anchor ) 2157 { 2158 /* 2159 * now hint the remaining edges (serifs and single) in order 2160 * to complete our processing 2161 */ 2162 for ( edge = edges; edge < edge_limit; edge++ ) 2163 { 2164 FT_Pos delta; 2165 2166 2167 if ( edge->flags & AF_EDGE_DONE ) 2168 continue; 2169 2170 delta = 1000; 2171 2172 if ( edge->serif ) 2173 { 2174 delta = edge->serif->opos - edge->opos; 2175 if ( delta < 0 ) 2176 delta = -delta; 2177 } 2178 2179 if ( delta < 64 + 16 ) 2180 { 2181 af_latin2_align_serif_edge( hints, edge->serif, edge ); 2182 AF_LOG(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f) " 2183 "aligned to (%.2f)\n", 2184 edge-edges, edge->opos / 64.0, 2185 edge->serif - edges, edge->serif->opos / 64.0, 2186 edge->pos / 64.0 )); 2187 } 2188 else if ( !anchor ) 2189 { 2190 AF_LOG(( "SERIF_ANCHOR: edge %d (opos=%.2f) snapped to (%.2f)\n", 2191 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2192 edge->pos = FT_PIX_ROUND( edge->opos ); 2193 anchor = edge; 2194 } 2195 else 2196 { 2197 AF_Edge before, after; 2198 2199 2200 for ( before = edge - 1; before >= edges; before-- ) 2201 if ( before->flags & AF_EDGE_DONE ) 2202 break; 2203 2204 for ( after = edge + 1; after < edge_limit; after++ ) 2205 if ( after->flags & AF_EDGE_DONE ) 2206 break; 2207 2208 if ( before >= edges && before < edge && 2209 after < edge_limit && after > edge ) 2210 { 2211 if ( after->opos == before->opos ) 2212 edge->pos = before->pos; 2213 else 2214 edge->pos = before->pos + 2215 FT_MulDiv( edge->opos - before->opos, 2216 after->pos - before->pos, 2217 after->opos - before->opos ); 2218 AF_LOG(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f) from %d (opos=%.2f)\n", 2219 edge-edges, edge->opos / 64.0, edge->pos / 64.0, before - edges, before->opos / 64.0 )); 2220 } 2221 else 2222 { 2223 edge->pos = anchor->pos + (( edge->opos - anchor->opos + 16) & ~31); 2224 2225 AF_LOG(( "SERIF_LINK2: edge %d (opos=%.2f) snapped to (%.2f)\n", 2226 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2227 } 2228 } 2229 2230 edge->flags |= AF_EDGE_DONE; 2231 2232 if ( edge > edges && edge->pos < edge[-1].pos ) 2233 edge->pos = edge[-1].pos; 2234 2235 if ( edge + 1 < edge_limit && 2236 edge[1].flags & AF_EDGE_DONE && 2237 edge->pos > edge[1].pos ) 2238 edge->pos = edge[1].pos; 2239 } 2240 } 2241 } 2242 2243 2244 static FT_Error 2245 af_latin2_hints_apply( AF_GlyphHints hints, 2246 FT_Outline* outline, 2247 AF_LatinMetrics metrics ) 2248 { 2249 FT_Error error; 2250 int dim; 2251 2252 2253 error = af_glyph_hints_reload( hints, outline ); 2254 if ( error ) 2255 goto Exit; 2256 2257 /* analyze glyph outline */ 2258 #ifdef AF_USE_WARPER 2259 if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT || 2260 AF_HINTS_DO_HORIZONTAL( hints ) ) 2261 #else 2262 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2263 #endif 2264 { 2265 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2266 if ( error ) 2267 goto Exit; 2268 } 2269 2270 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2271 { 2272 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT ); 2273 if ( error ) 2274 goto Exit; 2275 2276 af_latin2_hints_compute_blue_edges( hints, metrics ); 2277 } 2278 2279 /* grid-fit the outline */ 2280 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2281 { 2282 #ifdef AF_USE_WARPER 2283 if ( ( dim == AF_DIMENSION_HORZ && 2284 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) ) 2285 { 2286 AF_WarperRec warper; 2287 FT_Fixed scale; 2288 FT_Pos delta; 2289 2290 2291 af_warper_compute( &warper, hints, dim, &scale, &delta ); 2292 af_glyph_hints_scale_dim( hints, dim, scale, delta ); 2293 continue; 2294 } 2295 #endif 2296 2297 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2298 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2299 { 2300 af_latin2_hint_edges( hints, (AF_Dimension)dim ); 2301 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim ); 2302 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2303 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2304 } 2305 } 2306 af_glyph_hints_save( hints, outline ); 2307 2308 Exit: 2309 return error; 2310 } 2311 2312 2313 /*************************************************************************/ 2314 /*************************************************************************/ 2315 /***** *****/ 2316 /***** L A T I N S C R I P T C L A S S *****/ 2317 /***** *****/ 2318 /*************************************************************************/ 2319 /*************************************************************************/ 2320 2321 2322 static const AF_Script_UniRangeRec af_latin2_uniranges[] = 2323 { 2324 AF_UNIRANGE_REC( 32UL, 127UL ), /* XXX: TODO: Add new Unicode ranges here! */ 2325 AF_UNIRANGE_REC( 160UL, 255UL ), 2326 AF_UNIRANGE_REC( 0UL, 0UL ) 2327 }; 2328 2329 2330 AF_DEFINE_SCRIPT_CLASS(af_latin2_script_class, 2331 AF_SCRIPT_LATIN2, 2332 af_latin2_uniranges, 2333 2334 sizeof( AF_LatinMetricsRec ), 2335 2336 (AF_Script_InitMetricsFunc) af_latin2_metrics_init, 2337 (AF_Script_ScaleMetricsFunc)af_latin2_metrics_scale, 2338 (AF_Script_DoneMetricsFunc) NULL, 2339 2340 (AF_Script_InitHintsFunc) af_latin2_hints_init, 2341 (AF_Script_ApplyHintsFunc) af_latin2_hints_apply 2342 ) 2343 2344 2345 /* END */ 2346
