1 /***************************************************************************/ 2 /* */ 3 /* aflatin2.c */ 4 /* */ 5 /* Auto-fitter hinting routines for latin writing system (body). */ 6 /* */ 7 /* Copyright 2003-2015 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 19 #include FT_ADVANCES_H 20 21 #include "afglobal.h" 22 #include "aflatin.h" 23 #include "aflatin2.h" 24 #include "aferrors.h" 25 26 27 #ifdef AF_CONFIG_OPTION_USE_WARPER 28 #include "afwarp.h" 29 #endif 30 31 32 /*************************************************************************/ 33 /* */ 34 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 35 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 36 /* messages during execution. */ 37 /* */ 38 #undef FT_COMPONENT 39 #define FT_COMPONENT trace_aflatin2 40 41 42 FT_LOCAL_DEF( FT_Error ) 43 af_latin2_hints_compute_segments( AF_GlyphHints hints, 44 AF_Dimension dim ); 45 46 FT_LOCAL_DEF( void ) 47 af_latin2_hints_link_segments( AF_GlyphHints hints, 48 AF_Dimension dim ); 49 50 /*************************************************************************/ 51 /*************************************************************************/ 52 /***** *****/ 53 /***** L A T I N G L O B A L M E T R I C S *****/ 54 /***** *****/ 55 /*************************************************************************/ 56 /*************************************************************************/ 57 58 FT_LOCAL_DEF( void ) 59 af_latin2_metrics_init_widths( AF_LatinMetrics metrics, 60 FT_Face face ) 61 { 62 /* scan the array of segments in each direction */ 63 AF_GlyphHintsRec hints[1]; 64 65 66 af_glyph_hints_init( hints, face->memory ); 67 68 metrics->axis[AF_DIMENSION_HORZ].width_count = 0; 69 metrics->axis[AF_DIMENSION_VERT].width_count = 0; 70 71 { 72 FT_Error error; 73 FT_UInt glyph_index; 74 int dim; 75 AF_LatinMetricsRec dummy[1]; 76 AF_Scaler scaler = &dummy->root.scaler; 77 78 79 glyph_index = FT_Get_Char_Index( 80 face, 81 metrics->root.style_class->standard_char ); 82 if ( glyph_index == 0 ) 83 goto Exit; 84 85 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 86 if ( error || face->glyph->outline.n_points <= 0 ) 87 goto Exit; 88 89 FT_ZERO( dummy ); 90 91 dummy->units_per_em = metrics->units_per_em; 92 scaler->x_scale = scaler->y_scale = 0x10000L; 93 scaler->x_delta = scaler->y_delta = 0; 94 scaler->face = face; 95 scaler->render_mode = FT_RENDER_MODE_NORMAL; 96 scaler->flags = 0; 97 98 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy ); 99 100 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 101 if ( error ) 102 goto Exit; 103 104 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 105 { 106 AF_LatinAxis axis = &metrics->axis[dim]; 107 AF_AxisHints axhints = &hints->axis[dim]; 108 AF_Segment seg, limit, link; 109 FT_UInt num_widths = 0; 110 111 112 error = af_latin2_hints_compute_segments( hints, 113 (AF_Dimension)dim ); 114 if ( error ) 115 goto Exit; 116 117 af_latin2_hints_link_segments( hints, 118 (AF_Dimension)dim ); 119 120 seg = axhints->segments; 121 limit = seg + axhints->num_segments; 122 123 for ( ; seg < limit; seg++ ) 124 { 125 link = seg->link; 126 127 /* we only consider stem segments there! */ 128 if ( link && link->link == seg && link > seg ) 129 { 130 FT_Pos dist; 131 132 133 dist = seg->pos - link->pos; 134 if ( dist < 0 ) 135 dist = -dist; 136 137 if ( num_widths < AF_LATIN_MAX_WIDTHS ) 138 axis->widths[num_widths++].org = dist; 139 } 140 } 141 142 af_sort_widths( num_widths, axis->widths ); 143 axis->width_count = num_widths; 144 } 145 146 Exit: 147 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 148 { 149 AF_LatinAxis axis = &metrics->axis[dim]; 150 FT_Pos stdw; 151 152 153 stdw = ( axis->width_count > 0 ) 154 ? axis->widths[0].org 155 : AF_LATIN_CONSTANT( metrics, 50 ); 156 157 /* let's try 20% of the smallest width */ 158 axis->edge_distance_threshold = stdw / 5; 159 axis->standard_width = stdw; 160 axis->extra_light = 0; 161 } 162 } 163 164 af_glyph_hints_done( hints ); 165 } 166 167 168 169 #define AF_LATIN_MAX_TEST_CHARACTERS 12 170 171 172 static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES] 173 [AF_LATIN_MAX_TEST_CHARACTERS+1] = 174 { 175 "THEZOCQS", 176 "HEZLOCUS", 177 "fijkdbh", 178 "xzroesc", 179 "xzroesc", 180 "pqgjy" 181 }; 182 183 184 static void 185 af_latin2_metrics_init_blues( AF_LatinMetrics metrics, 186 FT_Face face ) 187 { 188 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS]; 189 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS]; 190 FT_Int num_flats; 191 FT_Int num_rounds; 192 FT_Int bb; 193 AF_LatinBlue blue; 194 FT_Error error; 195 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT]; 196 FT_GlyphSlot glyph = face->glyph; 197 198 199 /* we compute the blues simply by loading each character from the */ 200 /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */ 201 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */ 202 203 FT_TRACE5(( "blue zones computation\n" 204 "======================\n\n" )); 205 206 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 207 { 208 const char* p = af_latin2_blue_chars[bb]; 209 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS; 210 FT_Pos* blue_ref; 211 FT_Pos* blue_shoot; 212 213 214 FT_TRACE5(( "blue zone %d:\n", bb )); 215 216 num_flats = 0; 217 num_rounds = 0; 218 219 for ( ; p < limit && *p; p++ ) 220 { 221 FT_UInt glyph_index; 222 FT_Int best_point, best_y, best_first, best_last; 223 FT_Vector* points; 224 FT_Bool round; 225 226 227 /* load the character in the face -- skip unknown or empty ones */ 228 glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p ); 229 if ( glyph_index == 0 ) 230 continue; 231 232 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 233 if ( error || glyph->outline.n_points <= 0 ) 234 continue; 235 236 /* now compute min or max point indices and coordinates */ 237 points = glyph->outline.points; 238 best_point = -1; 239 best_y = 0; /* make compiler happy */ 240 best_first = 0; /* ditto */ 241 best_last = 0; /* ditto */ 242 243 { 244 FT_Int nn; 245 FT_Int first = 0; 246 FT_Int last = -1; 247 248 249 for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ ) 250 { 251 FT_Int old_best_point = best_point; 252 FT_Int pp; 253 254 255 last = glyph->outline.contours[nn]; 256 257 /* Avoid single-point contours since they are never rasterized. */ 258 /* In some fonts, they correspond to mark attachment points */ 259 /* which are way outside of the glyph's real outline. */ 260 if ( last == first ) 261 continue; 262 263 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 264 { 265 for ( pp = first; pp <= last; pp++ ) 266 if ( best_point < 0 || points[pp].y > best_y ) 267 { 268 best_point = pp; 269 best_y = points[pp].y; 270 } 271 } 272 else 273 { 274 for ( pp = first; pp <= last; pp++ ) 275 if ( best_point < 0 || points[pp].y < best_y ) 276 { 277 best_point = pp; 278 best_y = points[pp].y; 279 } 280 } 281 282 if ( best_point != old_best_point ) 283 { 284 best_first = first; 285 best_last = last; 286 } 287 } 288 FT_TRACE5(( " %c %d", *p, best_y )); 289 } 290 291 /* now check whether the point belongs to a straight or round */ 292 /* segment; we first need to find in which contour the extremum */ 293 /* lies, then inspect its previous and next points */ 294 { 295 FT_Pos best_x = points[best_point].x; 296 FT_Int start, end, prev, next; 297 FT_Pos dist; 298 299 300 /* now look for the previous and next points that are not on the */ 301 /* same Y coordinate. Threshold the `closeness'... */ 302 start = end = best_point; 303 304 do 305 { 306 prev = start - 1; 307 if ( prev < best_first ) 308 prev = best_last; 309 310 dist = FT_ABS( points[prev].y - best_y ); 311 /* accept a small distance or a small angle (both values are */ 312 /* heuristic; value 20 corresponds to approx. 2.9 degrees) */ 313 if ( dist > 5 ) 314 if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist ) 315 break; 316 317 start = prev; 318 319 } while ( start != best_point ); 320 321 do 322 { 323 next = end + 1; 324 if ( next > best_last ) 325 next = best_first; 326 327 dist = FT_ABS( points[next].y - best_y ); 328 if ( dist > 5 ) 329 if ( FT_ABS( points[next].x - best_x ) <= 20 * dist ) 330 break; 331 332 end = next; 333 334 } while ( end != best_point ); 335 336 /* now, set the `round' flag depending on the segment's kind */ 337 round = FT_BOOL( 338 FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON || 339 FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON ); 340 341 FT_TRACE5(( " (%s)\n", round ? "round" : "flat" )); 342 } 343 344 if ( round ) 345 rounds[num_rounds++] = best_y; 346 else 347 flats[num_flats++] = best_y; 348 } 349 350 if ( num_flats == 0 && num_rounds == 0 ) 351 { 352 /* 353 * we couldn't find a single glyph to compute this blue zone, 354 * we will simply ignore it then 355 */ 356 FT_TRACE5(( " empty\n" )); 357 continue; 358 } 359 360 /* we have computed the contents of the `rounds' and `flats' tables, */ 361 /* now determine the reference and overshoot position of the blue -- */ 362 /* we simply take the median value after a simple sort */ 363 af_sort_pos( num_rounds, rounds ); 364 af_sort_pos( num_flats, flats ); 365 366 blue = & axis->blues[axis->blue_count]; 367 blue_ref = & blue->ref.org; 368 blue_shoot = & blue->shoot.org; 369 370 axis->blue_count++; 371 372 if ( num_flats == 0 ) 373 { 374 *blue_ref = 375 *blue_shoot = rounds[num_rounds / 2]; 376 } 377 else if ( num_rounds == 0 ) 378 { 379 *blue_ref = 380 *blue_shoot = flats[num_flats / 2]; 381 } 382 else 383 { 384 *blue_ref = flats[num_flats / 2]; 385 *blue_shoot = rounds[num_rounds / 2]; 386 } 387 388 /* there are sometimes problems: if the overshoot position of top */ 389 /* zones is under its reference position, or the opposite for bottom */ 390 /* zones. We must thus check everything there and correct the errors */ 391 if ( *blue_shoot != *blue_ref ) 392 { 393 FT_Pos ref = *blue_ref; 394 FT_Pos shoot = *blue_shoot; 395 FT_Bool over_ref = FT_BOOL( shoot > ref ); 396 397 398 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref ) 399 { 400 *blue_ref = 401 *blue_shoot = ( shoot + ref ) / 2; 402 403 FT_TRACE5(( " [overshoot smaller than reference," 404 " taking mean value]\n" )); 405 } 406 } 407 408 blue->flags = 0; 409 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 410 blue->flags |= AF_LATIN_BLUE_TOP; 411 412 /* 413 * The following flag is used later to adjust the y and x scales 414 * in order to optimize the pixel grid alignment of the top of small 415 * letters. 416 */ 417 if ( AF_LATIN_IS_X_HEIGHT_BLUE( bb ) ) 418 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT; 419 420 FT_TRACE5(( " -> reference = %ld\n" 421 " overshoot = %ld\n", 422 *blue_ref, *blue_shoot )); 423 } 424 425 return; 426 } 427 428 429 FT_LOCAL_DEF( void ) 430 af_latin2_metrics_check_digits( AF_LatinMetrics metrics, 431 FT_Face face ) 432 { 433 FT_UInt i; 434 FT_Bool started = 0, same_width = 1; 435 FT_Fixed advance, old_advance = 0; 436 437 438 /* check whether all ASCII digits have the same advance width; */ 439 /* digit `0' is 0x30 in all supported charmaps */ 440 for ( i = 0x30; i <= 0x39; i++ ) 441 { 442 FT_UInt glyph_index; 443 444 445 glyph_index = FT_Get_Char_Index( face, i ); 446 if ( glyph_index == 0 ) 447 continue; 448 449 if ( FT_Get_Advance( face, glyph_index, 450 FT_LOAD_NO_SCALE | 451 FT_LOAD_NO_HINTING | 452 FT_LOAD_IGNORE_TRANSFORM, 453 &advance ) ) 454 continue; 455 456 if ( started ) 457 { 458 if ( advance != old_advance ) 459 { 460 same_width = 0; 461 break; 462 } 463 } 464 else 465 { 466 old_advance = advance; 467 started = 1; 468 } 469 } 470 471 metrics->root.digits_have_same_width = same_width; 472 } 473 474 475 FT_LOCAL_DEF( FT_Error ) 476 af_latin2_metrics_init( AF_LatinMetrics metrics, 477 FT_Face face ) 478 { 479 FT_Error error = FT_Err_Ok; 480 FT_CharMap oldmap = face->charmap; 481 FT_UInt ee; 482 483 static const FT_Encoding latin_encodings[] = 484 { 485 FT_ENCODING_UNICODE, 486 FT_ENCODING_APPLE_ROMAN, 487 FT_ENCODING_ADOBE_STANDARD, 488 FT_ENCODING_ADOBE_LATIN_1, 489 FT_ENCODING_NONE /* end of list */ 490 }; 491 492 493 metrics->units_per_em = face->units_per_EM; 494 495 /* do we have a latin charmap in there? */ 496 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ ) 497 { 498 error = FT_Select_Charmap( face, latin_encodings[ee] ); 499 if ( !error ) 500 break; 501 } 502 503 if ( !error ) 504 { 505 af_latin2_metrics_init_widths( metrics, face ); 506 af_latin2_metrics_init_blues( metrics, face ); 507 af_latin2_metrics_check_digits( metrics, face ); 508 } 509 510 FT_Set_Charmap( face, oldmap ); 511 return FT_Err_Ok; 512 } 513 514 515 static void 516 af_latin2_metrics_scale_dim( AF_LatinMetrics metrics, 517 AF_Scaler scaler, 518 AF_Dimension dim ) 519 { 520 FT_Fixed scale; 521 FT_Pos delta; 522 AF_LatinAxis axis; 523 FT_UInt nn; 524 525 526 if ( dim == AF_DIMENSION_HORZ ) 527 { 528 scale = scaler->x_scale; 529 delta = scaler->x_delta; 530 } 531 else 532 { 533 scale = scaler->y_scale; 534 delta = scaler->y_delta; 535 } 536 537 axis = &metrics->axis[dim]; 538 539 if ( axis->org_scale == scale && axis->org_delta == delta ) 540 return; 541 542 axis->org_scale = scale; 543 axis->org_delta = delta; 544 545 /* 546 * correct Y scale to optimize the alignment of the top of small 547 * letters to the pixel grid 548 */ 549 if ( dim == AF_DIMENSION_VERT ) 550 { 551 AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT]; 552 AF_LatinBlue blue = NULL; 553 554 555 for ( nn = 0; nn < vaxis->blue_count; nn++ ) 556 { 557 if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT ) 558 { 559 blue = &vaxis->blues[nn]; 560 break; 561 } 562 } 563 564 if ( blue ) 565 { 566 FT_Pos scaled; 567 FT_Pos threshold; 568 FT_Pos fitted; 569 FT_UInt limit; 570 FT_UInt ppem; 571 572 573 scaled = FT_MulFix( blue->shoot.org, scaler->y_scale ); 574 ppem = metrics->root.scaler.face->size->metrics.x_ppem; 575 limit = metrics->root.globals->increase_x_height; 576 threshold = 40; 577 578 /* if the `increase-x-height' property is active, */ 579 /* we round up much more often */ 580 if ( limit && 581 ppem <= limit && 582 ppem >= AF_PROP_INCREASE_X_HEIGHT_MIN ) 583 threshold = 52; 584 585 fitted = ( scaled + threshold ) & ~63; 586 587 #if 1 588 if ( scaled != fitted ) 589 { 590 scale = FT_MulDiv( scale, fitted, scaled ); 591 FT_TRACE5(( "== scaled x-top = %.2g" 592 " fitted = %.2g, scaling = %.4g\n", 593 scaled / 64.0, fitted / 64.0, 594 ( fitted * 1.0 ) / scaled )); 595 } 596 #endif 597 } 598 } 599 600 axis->scale = scale; 601 axis->delta = delta; 602 603 if ( dim == AF_DIMENSION_HORZ ) 604 { 605 metrics->root.scaler.x_scale = scale; 606 metrics->root.scaler.x_delta = delta; 607 } 608 else 609 { 610 metrics->root.scaler.y_scale = scale; 611 metrics->root.scaler.y_delta = delta; 612 } 613 614 /* scale the standard widths */ 615 for ( nn = 0; nn < axis->width_count; nn++ ) 616 { 617 AF_Width width = axis->widths + nn; 618 619 620 width->cur = FT_MulFix( width->org, scale ); 621 width->fit = width->cur; 622 } 623 624 /* an extra-light axis corresponds to a standard width that is */ 625 /* smaller than 5/8 pixels */ 626 axis->extra_light = 627 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 ); 628 629 if ( dim == AF_DIMENSION_VERT ) 630 { 631 /* scale the blue zones */ 632 for ( nn = 0; nn < axis->blue_count; nn++ ) 633 { 634 AF_LatinBlue blue = &axis->blues[nn]; 635 FT_Pos dist; 636 637 638 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 639 blue->ref.fit = blue->ref.cur; 640 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 641 blue->shoot.fit = blue->shoot.cur; 642 blue->flags &= ~AF_LATIN_BLUE_ACTIVE; 643 644 /* a blue zone is only active if it is less than 3/4 pixels tall */ 645 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 646 if ( dist <= 48 && dist >= -48 ) 647 { 648 FT_Pos delta1, delta2; 649 650 delta1 = blue->shoot.org - blue->ref.org; 651 delta2 = delta1; 652 if ( delta1 < 0 ) 653 delta2 = -delta2; 654 655 delta2 = FT_MulFix( delta2, scale ); 656 657 if ( delta2 < 32 ) 658 delta2 = 0; 659 else if ( delta2 < 64 ) 660 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 661 else 662 delta2 = FT_PIX_ROUND( delta2 ); 663 664 if ( delta1 < 0 ) 665 delta2 = -delta2; 666 667 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 668 blue->shoot.fit = blue->ref.fit + delta2; 669 670 FT_TRACE5(( ">> activating blue zone %d:" 671 " ref.cur=%.2g ref.fit=%.2g" 672 " shoot.cur=%.2g shoot.fit=%.2g\n", 673 nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0, 674 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 )); 675 676 blue->flags |= AF_LATIN_BLUE_ACTIVE; 677 } 678 } 679 } 680 } 681 682 683 FT_LOCAL_DEF( void ) 684 af_latin2_metrics_scale( AF_LatinMetrics metrics, 685 AF_Scaler scaler ) 686 { 687 metrics->root.scaler.render_mode = scaler->render_mode; 688 metrics->root.scaler.face = scaler->face; 689 metrics->root.scaler.flags = scaler->flags; 690 691 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 692 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 693 } 694 695 696 /* Extract standard_width from writing system/script specific */ 697 /* metrics class. */ 698 699 FT_LOCAL_DEF( void ) 700 af_latin2_get_standard_widths( AF_LatinMetrics metrics, 701 FT_Pos* stdHW, 702 FT_Pos* stdVW ) 703 { 704 if ( stdHW ) 705 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width; 706 707 if ( stdVW ) 708 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width; 709 } 710 711 712 /*************************************************************************/ 713 /*************************************************************************/ 714 /***** *****/ 715 /***** L A T I N G L Y P H A N A L Y S I S *****/ 716 /***** *****/ 717 /*************************************************************************/ 718 /*************************************************************************/ 719 720 #define SORT_SEGMENTS 721 722 FT_LOCAL_DEF( FT_Error ) 723 af_latin2_hints_compute_segments( AF_GlyphHints hints, 724 AF_Dimension dim ) 725 { 726 AF_AxisHints axis = &hints->axis[dim]; 727 FT_Memory memory = hints->memory; 728 FT_Error error = FT_Err_Ok; 729 AF_Segment segment = NULL; 730 AF_SegmentRec seg0; 731 AF_Point* contour = hints->contours; 732 AF_Point* contour_limit = contour + hints->num_contours; 733 AF_Direction major_dir, segment_dir; 734 735 736 FT_ZERO( &seg0 ); 737 seg0.score = 32000; 738 seg0.flags = AF_EDGE_NORMAL; 739 740 major_dir = (AF_Direction)FT_ABS( axis->major_dir ); 741 segment_dir = major_dir; 742 743 axis->num_segments = 0; 744 745 /* set up (u,v) in each point */ 746 if ( dim == AF_DIMENSION_HORZ ) 747 { 748 AF_Point point = hints->points; 749 AF_Point limit = point + hints->num_points; 750 751 752 for ( ; point < limit; point++ ) 753 { 754 point->u = point->fx; 755 point->v = point->fy; 756 } 757 } 758 else 759 { 760 AF_Point point = hints->points; 761 AF_Point limit = point + hints->num_points; 762 763 764 for ( ; point < limit; point++ ) 765 { 766 point->u = point->fy; 767 point->v = point->fx; 768 } 769 } 770 771 /* do each contour separately */ 772 for ( ; contour < contour_limit; contour++ ) 773 { 774 AF_Point point = contour[0]; 775 AF_Point start = point; 776 AF_Point last = point->prev; 777 778 779 if ( point == last ) /* skip singletons -- just in case */ 780 continue; 781 782 /* already on an edge ?, backtrack to find its start */ 783 if ( FT_ABS( point->in_dir ) == major_dir ) 784 { 785 point = point->prev; 786 787 while ( point->in_dir == start->in_dir ) 788 point = point->prev; 789 } 790 else /* otherwise, find first segment start, if any */ 791 { 792 while ( FT_ABS( point->out_dir ) != major_dir ) 793 { 794 point = point->next; 795 796 if ( point == start ) 797 goto NextContour; 798 } 799 } 800 801 start = point; 802 803 for (;;) 804 { 805 AF_Point first; 806 FT_Pos min_u, min_v, max_u, max_v; 807 808 /* we're at the start of a new segment */ 809 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir && 810 point->in_dir != point->out_dir ); 811 first = point; 812 813 min_u = max_u = point->u; 814 min_v = max_v = point->v; 815 816 point = point->next; 817 818 while ( point->out_dir == first->out_dir ) 819 { 820 point = point->next; 821 822 if ( point->u < min_u ) 823 min_u = point->u; 824 825 if ( point->u > max_u ) 826 max_u = point->u; 827 } 828 829 if ( point->v < min_v ) 830 min_v = point->v; 831 832 if ( point->v > max_v ) 833 max_v = point->v; 834 835 /* record new segment */ 836 error = af_axis_hints_new_segment( axis, memory, &segment ); 837 if ( error ) 838 goto Exit; 839 840 segment[0] = seg0; 841 segment->dir = first->out_dir; 842 segment->first = first; 843 segment->last = point; 844 segment->pos = (FT_Short)( ( min_u + max_u ) >> 1 ); 845 segment->min_coord = (FT_Short) min_v; 846 segment->max_coord = (FT_Short) max_v; 847 segment->height = (FT_Short)( max_v - min_v ); 848 849 /* a segment is round if it doesn't have successive */ 850 /* on-curve points. */ 851 { 852 AF_Point pt = first; 853 AF_Point last = point; 854 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL; 855 FT_UInt f1; 856 857 858 segment->flags &= ~AF_EDGE_ROUND; 859 860 for ( ; pt != last; f0 = f1 ) 861 { 862 pt = pt->next; 863 f1 = pt->flags & AF_FLAG_CONTROL; 864 865 if ( !f0 && !f1 ) 866 break; 867 868 if ( pt == last ) 869 segment->flags |= AF_EDGE_ROUND; 870 } 871 } 872 873 /* this can happen in the case of a degenerate contour 874 * e.g. a 2-point vertical contour 875 */ 876 if ( point == start ) 877 break; 878 879 /* jump to the start of the next segment, if any */ 880 while ( FT_ABS( point->out_dir ) != major_dir ) 881 { 882 point = point->next; 883 884 if ( point == start ) 885 goto NextContour; 886 } 887 } 888 889 NextContour: 890 ; 891 } /* contours */ 892 893 /* now slightly increase the height of segments when this makes */ 894 /* sense -- this is used to better detect and ignore serifs */ 895 { 896 AF_Segment segments = axis->segments; 897 AF_Segment segments_end = segments + axis->num_segments; 898 899 900 for ( segment = segments; segment < segments_end; segment++ ) 901 { 902 AF_Point first = segment->first; 903 AF_Point last = segment->last; 904 AF_Point p; 905 FT_Pos first_v = first->v; 906 FT_Pos last_v = last->v; 907 908 909 if ( first_v < last_v ) 910 { 911 p = first->prev; 912 if ( p->v < first_v ) 913 segment->height = (FT_Short)( segment->height + 914 ( ( first_v - p->v ) >> 1 ) ); 915 916 p = last->next; 917 if ( p->v > last_v ) 918 segment->height = (FT_Short)( segment->height + 919 ( ( p->v - last_v ) >> 1 ) ); 920 } 921 else 922 { 923 p = first->prev; 924 if ( p->v > first_v ) 925 segment->height = (FT_Short)( segment->height + 926 ( ( p->v - first_v ) >> 1 ) ); 927 928 p = last->next; 929 if ( p->v < last_v ) 930 segment->height = (FT_Short)( segment->height + 931 ( ( last_v - p->v ) >> 1 ) ); 932 } 933 } 934 } 935 936 #ifdef AF_SORT_SEGMENTS 937 /* place all segments with a negative direction to the start 938 * of the array, used to speed up segment linking later... 939 */ 940 { 941 AF_Segment segments = axis->segments; 942 FT_UInt count = axis->num_segments; 943 FT_UInt ii, jj; 944 945 for ( ii = 0; ii < count; ii++ ) 946 { 947 if ( segments[ii].dir > 0 ) 948 { 949 for ( jj = ii + 1; jj < count; jj++ ) 950 { 951 if ( segments[jj].dir < 0 ) 952 { 953 AF_SegmentRec tmp; 954 955 956 tmp = segments[ii]; 957 segments[ii] = segments[jj]; 958 segments[jj] = tmp; 959 960 break; 961 } 962 } 963 964 if ( jj == count ) 965 break; 966 } 967 } 968 axis->mid_segments = ii; 969 } 970 #endif 971 972 Exit: 973 return error; 974 } 975 976 977 FT_LOCAL_DEF( void ) 978 af_latin2_hints_link_segments( AF_GlyphHints hints, 979 AF_Dimension dim ) 980 { 981 AF_AxisHints axis = &hints->axis[dim]; 982 AF_Segment segments = axis->segments; 983 AF_Segment segment_limit = segments + axis->num_segments; 984 #ifdef AF_SORT_SEGMENTS 985 AF_Segment segment_mid = segments + axis->mid_segments; 986 #endif 987 FT_Pos len_threshold, len_score; 988 AF_Segment seg1, seg2; 989 990 991 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 992 if ( len_threshold == 0 ) 993 len_threshold = 1; 994 995 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 ); 996 997 #ifdef AF_SORT_SEGMENTS 998 for ( seg1 = segments; seg1 < segment_mid; seg1++ ) 999 { 1000 if ( seg1->dir != axis->major_dir ) 1001 continue; 1002 1003 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ ) 1004 #else 1005 /* now compare each segment to the others */ 1006 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1007 { 1008 if ( seg1->dir != axis->major_dir ) 1009 continue; 1010 1011 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 1012 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos ) 1013 #endif 1014 { 1015 FT_Pos pos1 = seg1->pos; 1016 FT_Pos pos2 = seg2->pos; 1017 FT_Pos dist = pos2 - pos1; 1018 1019 1020 if ( dist < 0 ) 1021 continue; 1022 1023 { 1024 FT_Pos min = seg1->min_coord; 1025 FT_Pos max = seg1->max_coord; 1026 FT_Pos len, score; 1027 1028 1029 if ( min < seg2->min_coord ) 1030 min = seg2->min_coord; 1031 1032 if ( max > seg2->max_coord ) 1033 max = seg2->max_coord; 1034 1035 len = max - min; 1036 if ( len >= len_threshold ) 1037 { 1038 score = dist + len_score / len; 1039 if ( score < seg1->score ) 1040 { 1041 seg1->score = score; 1042 seg1->link = seg2; 1043 } 1044 1045 if ( score < seg2->score ) 1046 { 1047 seg2->score = score; 1048 seg2->link = seg1; 1049 } 1050 } 1051 } 1052 } 1053 } 1054 #if 0 1055 } 1056 #endif 1057 1058 /* now, compute the `serif' segments */ 1059 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1060 { 1061 seg2 = seg1->link; 1062 1063 if ( seg2 ) 1064 { 1065 if ( seg2->link != seg1 ) 1066 { 1067 seg1->link = NULL; 1068 seg1->serif = seg2->link; 1069 } 1070 } 1071 } 1072 } 1073 1074 1075 FT_LOCAL_DEF( FT_Error ) 1076 af_latin2_hints_compute_edges( AF_GlyphHints hints, 1077 AF_Dimension dim ) 1078 { 1079 AF_AxisHints axis = &hints->axis[dim]; 1080 FT_Error error = FT_Err_Ok; 1081 FT_Memory memory = hints->memory; 1082 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim]; 1083 1084 AF_Segment segments = axis->segments; 1085 AF_Segment segment_limit = segments + axis->num_segments; 1086 AF_Segment seg; 1087 1088 AF_Direction up_dir; 1089 FT_Fixed scale; 1090 FT_Pos edge_distance_threshold; 1091 FT_Pos segment_length_threshold; 1092 1093 1094 axis->num_edges = 0; 1095 1096 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 1097 : hints->y_scale; 1098 1099 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP 1100 : AF_DIR_RIGHT; 1101 1102 /* 1103 * We want to ignore very small (mostly serif) segments, we do that 1104 * by ignoring those that whose length is less than a given fraction 1105 * of the standard width. If there is no standard width, we ignore 1106 * those that are less than a given size in pixels 1107 * 1108 * also, unlink serif segments that are linked to segments farther 1109 * than 50% of the standard width 1110 */ 1111 if ( dim == AF_DIMENSION_HORZ ) 1112 { 1113 if ( laxis->width_count > 0 ) 1114 segment_length_threshold = ( laxis->standard_width * 10 ) >> 4; 1115 else 1116 segment_length_threshold = FT_DivFix( 64, hints->y_scale ); 1117 } 1118 else 1119 segment_length_threshold = 0; 1120 1121 /*********************************************************************/ 1122 /* */ 1123 /* We will begin by generating a sorted table of edges for the */ 1124 /* current direction. To do so, we simply scan each segment and try */ 1125 /* to find an edge in our table that corresponds to its position. */ 1126 /* */ 1127 /* If no edge is found, we create and insert a new edge in the */ 1128 /* sorted table. Otherwise, we simply add the segment to the edge's */ 1129 /* list which will be processed in the second step to compute the */ 1130 /* edge's properties. */ 1131 /* */ 1132 /* Note that the edges table is sorted along the segment/edge */ 1133 /* position. */ 1134 /* */ 1135 /*********************************************************************/ 1136 1137 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1138 scale ); 1139 if ( edge_distance_threshold > 64 / 4 ) 1140 edge_distance_threshold = 64 / 4; 1141 1142 edge_distance_threshold = FT_DivFix( edge_distance_threshold, 1143 scale ); 1144 1145 for ( seg = segments; seg < segment_limit; seg++ ) 1146 { 1147 AF_Edge found = NULL; 1148 FT_Int ee; 1149 1150 1151 if ( seg->height < segment_length_threshold ) 1152 continue; 1153 1154 /* A special case for serif edges: If they are smaller than */ 1155 /* 1.5 pixels we ignore them. */ 1156 if ( seg->serif ) 1157 { 1158 FT_Pos dist = seg->serif->pos - seg->pos; 1159 1160 1161 if ( dist < 0 ) 1162 dist = -dist; 1163 1164 if ( dist >= laxis->standard_width >> 1 ) 1165 { 1166 /* unlink this serif, it is too distant from its reference stem */ 1167 seg->serif = NULL; 1168 } 1169 else if ( 2*seg->height < 3 * segment_length_threshold ) 1170 continue; 1171 } 1172 1173 /* look for an edge corresponding to the segment */ 1174 for ( ee = 0; ee < axis->num_edges; ee++ ) 1175 { 1176 AF_Edge edge = axis->edges + ee; 1177 FT_Pos dist; 1178 1179 1180 dist = seg->pos - edge->fpos; 1181 if ( dist < 0 ) 1182 dist = -dist; 1183 1184 if ( dist < edge_distance_threshold && edge->dir == seg->dir ) 1185 { 1186 found = edge; 1187 break; 1188 } 1189 } 1190 1191 if ( !found ) 1192 { 1193 AF_Edge edge; 1194 1195 1196 /* insert a new edge in the list and */ 1197 /* sort according to the position */ 1198 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, 1199 memory, &edge ); 1200 if ( error ) 1201 goto Exit; 1202 1203 /* add the segment to the new edge's list */ 1204 FT_ZERO( edge ); 1205 1206 edge->first = seg; 1207 edge->last = seg; 1208 edge->dir = seg->dir; 1209 edge->fpos = seg->pos; 1210 edge->opos = FT_MulFix( seg->pos, scale ); 1211 edge->pos = edge->opos; 1212 seg->edge_next = seg; 1213 } 1214 else 1215 { 1216 /* if an edge was found, simply add the segment to the edge's */ 1217 /* list */ 1218 seg->edge_next = found->first; 1219 found->last->edge_next = seg; 1220 found->last = seg; 1221 } 1222 } 1223 1224 1225 /*********************************************************************/ 1226 /* */ 1227 /* Good, we will now compute each edge's properties according to */ 1228 /* segments found on its position. Basically, these are: */ 1229 /* */ 1230 /* - edge's main direction */ 1231 /* - stem edge, serif edge or both (which defaults to stem then) */ 1232 /* - rounded edge, straight or both (which defaults to straight) */ 1233 /* - link for edge */ 1234 /* */ 1235 /*********************************************************************/ 1236 1237 /* first of all, set the `edge' field in each segment -- this is */ 1238 /* required in order to compute edge links */ 1239 1240 /* 1241 * Note that removing this loop and setting the `edge' field of each 1242 * segment directly in the code above slows down execution speed for 1243 * some reasons on platforms like the Sun. 1244 */ 1245 { 1246 AF_Edge edges = axis->edges; 1247 AF_Edge edge_limit = edges + axis->num_edges; 1248 AF_Edge edge; 1249 1250 1251 for ( edge = edges; edge < edge_limit; edge++ ) 1252 { 1253 seg = edge->first; 1254 if ( seg ) 1255 do 1256 { 1257 seg->edge = edge; 1258 seg = seg->edge_next; 1259 1260 } while ( seg != edge->first ); 1261 } 1262 1263 /* now, compute each edge properties */ 1264 for ( edge = edges; edge < edge_limit; edge++ ) 1265 { 1266 FT_Int is_round = 0; /* does it contain round segments? */ 1267 FT_Int is_straight = 0; /* does it contain straight segments? */ 1268 #if 0 1269 FT_Pos ups = 0; /* number of upwards segments */ 1270 FT_Pos downs = 0; /* number of downwards segments */ 1271 #endif 1272 1273 1274 seg = edge->first; 1275 1276 do 1277 { 1278 FT_Bool is_serif; 1279 1280 1281 /* check for roundness of segment */ 1282 if ( seg->flags & AF_EDGE_ROUND ) 1283 is_round++; 1284 else 1285 is_straight++; 1286 1287 #if 0 1288 /* check for segment direction */ 1289 if ( seg->dir == up_dir ) 1290 ups += seg->max_coord-seg->min_coord; 1291 else 1292 downs += seg->max_coord-seg->min_coord; 1293 #endif 1294 1295 /* check for links -- if seg->serif is set, then seg->link must */ 1296 /* be ignored */ 1297 is_serif = (FT_Bool)( seg->serif && 1298 seg->serif->edge && 1299 seg->serif->edge != edge ); 1300 1301 if ( ( seg->link && seg->link->edge != NULL ) || is_serif ) 1302 { 1303 AF_Edge edge2; 1304 AF_Segment seg2; 1305 1306 1307 edge2 = edge->link; 1308 seg2 = seg->link; 1309 1310 if ( is_serif ) 1311 { 1312 seg2 = seg->serif; 1313 edge2 = edge->serif; 1314 } 1315 1316 if ( edge2 ) 1317 { 1318 FT_Pos edge_delta; 1319 FT_Pos seg_delta; 1320 1321 1322 edge_delta = edge->fpos - edge2->fpos; 1323 if ( edge_delta < 0 ) 1324 edge_delta = -edge_delta; 1325 1326 seg_delta = seg->pos - seg2->pos; 1327 if ( seg_delta < 0 ) 1328 seg_delta = -seg_delta; 1329 1330 if ( seg_delta < edge_delta ) 1331 edge2 = seg2->edge; 1332 } 1333 else 1334 edge2 = seg2->edge; 1335 1336 if ( is_serif ) 1337 { 1338 edge->serif = edge2; 1339 edge2->flags |= AF_EDGE_SERIF; 1340 } 1341 else 1342 edge->link = edge2; 1343 } 1344 1345 seg = seg->edge_next; 1346 1347 } while ( seg != edge->first ); 1348 1349 /* set the round/straight flags */ 1350 edge->flags = AF_EDGE_NORMAL; 1351 1352 if ( is_round > 0 && is_round >= is_straight ) 1353 edge->flags |= AF_EDGE_ROUND; 1354 1355 #if 0 1356 /* set the edge's main direction */ 1357 edge->dir = AF_DIR_NONE; 1358 1359 if ( ups > downs ) 1360 edge->dir = (FT_Char)up_dir; 1361 1362 else if ( ups < downs ) 1363 edge->dir = (FT_Char)-up_dir; 1364 1365 else if ( ups == downs ) 1366 edge->dir = 0; /* both up and down! */ 1367 #endif 1368 1369 /* gets rid of serifs if link is set */ 1370 /* XXX: This gets rid of many unpleasant artefacts! */ 1371 /* Example: the `c' in cour.pfa at size 13 */ 1372 1373 if ( edge->serif && edge->link ) 1374 edge->serif = NULL; 1375 } 1376 } 1377 1378 Exit: 1379 return error; 1380 } 1381 1382 1383 FT_LOCAL_DEF( FT_Error ) 1384 af_latin2_hints_detect_features( AF_GlyphHints hints, 1385 AF_Dimension dim ) 1386 { 1387 FT_Error error; 1388 1389 1390 error = af_latin2_hints_compute_segments( hints, dim ); 1391 if ( !error ) 1392 { 1393 af_latin2_hints_link_segments( hints, dim ); 1394 1395 error = af_latin2_hints_compute_edges( hints, dim ); 1396 } 1397 return error; 1398 } 1399 1400 1401 static void 1402 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints, 1403 AF_LatinMetrics metrics ) 1404 { 1405 AF_AxisHints axis = &hints->axis[AF_DIMENSION_VERT]; 1406 AF_Edge edge = axis->edges; 1407 AF_Edge edge_limit = edge + axis->num_edges; 1408 AF_LatinAxis latin = &metrics->axis[AF_DIMENSION_VERT]; 1409 FT_Fixed scale = latin->scale; 1410 FT_Pos best_dist0; /* initial threshold */ 1411 1412 1413 /* compute the initial threshold as a fraction of the EM size */ 1414 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1415 1416 if ( best_dist0 > 64 / 2 ) 1417 best_dist0 = 64 / 2; 1418 1419 /* compute which blue zones are active, i.e. have their scaled */ 1420 /* size < 3/4 pixels */ 1421 1422 /* for each horizontal edge search the blue zone which is closest */ 1423 for ( ; edge < edge_limit; edge++ ) 1424 { 1425 FT_Int bb; 1426 AF_Width best_blue = NULL; 1427 FT_Pos best_dist = best_dist0; 1428 1429 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 1430 { 1431 AF_LatinBlue blue = latin->blues + bb; 1432 FT_Bool is_top_blue, is_major_dir; 1433 1434 1435 /* skip inactive blue zones (i.e., those that are too small) */ 1436 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) ) 1437 continue; 1438 1439 /* if it is a top zone, check for right edges -- if it is a bottom */ 1440 /* zone, check for left edges */ 1441 /* */ 1442 /* of course, that's for TrueType */ 1443 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 ); 1444 is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); 1445 1446 /* if it is a top zone, the edge must be against the major */ 1447 /* direction; if it is a bottom zone, it must be in the major */ 1448 /* direction */ 1449 if ( is_top_blue ^ is_major_dir ) 1450 { 1451 FT_Pos dist; 1452 AF_Width compare; 1453 1454 1455 /* if it's a rounded edge, compare it to the overshoot position */ 1456 /* if it's a flat edge, compare it to the reference position */ 1457 if ( edge->flags & AF_EDGE_ROUND ) 1458 compare = &blue->shoot; 1459 else 1460 compare = &blue->ref; 1461 1462 dist = edge->fpos - compare->org; 1463 if ( dist < 0 ) 1464 dist = -dist; 1465 1466 dist = FT_MulFix( dist, scale ); 1467 if ( dist < best_dist ) 1468 { 1469 best_dist = dist; 1470 best_blue = compare; 1471 } 1472 1473 #if 0 1474 /* now, compare it to the overshoot position if the edge is */ 1475 /* rounded, and if the edge is over the reference position of a */ 1476 /* top zone, or under the reference position of a bottom zone */ 1477 if ( edge->flags & AF_EDGE_ROUND && dist != 0 ) 1478 { 1479 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org ); 1480 1481 1482 if ( is_top_blue ^ is_under_ref ) 1483 { 1484 blue = latin->blues + bb; 1485 dist = edge->fpos - blue->shoot.org; 1486 if ( dist < 0 ) 1487 dist = -dist; 1488 1489 dist = FT_MulFix( dist, scale ); 1490 if ( dist < best_dist ) 1491 { 1492 best_dist = dist; 1493 best_blue = & blue->shoot; 1494 } 1495 } 1496 } 1497 #endif 1498 } 1499 } 1500 1501 if ( best_blue ) 1502 edge->blue_edge = best_blue; 1503 } 1504 } 1505 1506 1507 static FT_Error 1508 af_latin2_hints_init( AF_GlyphHints hints, 1509 AF_LatinMetrics metrics ) 1510 { 1511 FT_Render_Mode mode; 1512 FT_UInt32 scaler_flags, other_flags; 1513 FT_Face face = metrics->root.scaler.face; 1514 1515 1516 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics ); 1517 1518 /* 1519 * correct x_scale and y_scale if needed, since they may have 1520 * been modified `af_latin2_metrics_scale_dim' above 1521 */ 1522 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1523 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1524 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1525 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1526 1527 /* compute flags depending on render mode, etc. */ 1528 mode = metrics->root.scaler.render_mode; 1529 1530 #if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */ 1531 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1532 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1533 #endif 1534 1535 scaler_flags = hints->scaler_flags; 1536 other_flags = 0; 1537 1538 /* 1539 * We snap the width of vertical stems for the monochrome and 1540 * horizontal LCD rendering targets only. 1541 */ 1542 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1543 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1544 1545 /* 1546 * We snap the width of horizontal stems for the monochrome and 1547 * vertical LCD rendering targets only. 1548 */ 1549 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1550 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1551 1552 /* 1553 * We adjust stems to full pixels only if we don't use the `light' mode. 1554 */ 1555 if ( mode != FT_RENDER_MODE_LIGHT ) 1556 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1557 1558 if ( mode == FT_RENDER_MODE_MONO ) 1559 other_flags |= AF_LATIN_HINTS_MONO; 1560 1561 /* 1562 * In `light' hinting mode we disable horizontal hinting completely. 1563 * We also do it if the face is italic. 1564 */ 1565 if ( mode == FT_RENDER_MODE_LIGHT || 1566 ( face->style_flags & FT_STYLE_FLAG_ITALIC ) != 0 ) 1567 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL; 1568 1569 #ifdef AF_CONFIG_OPTION_USE_WARPER 1570 /* get (global) warper flag */ 1571 if ( !metrics->root.globals->module->warping ) 1572 scaler_flags |= AF_SCALER_FLAG_NO_WARPER; 1573 #endif 1574 1575 hints->scaler_flags = scaler_flags; 1576 hints->other_flags = other_flags; 1577 1578 return 0; 1579 } 1580 1581 1582 /*************************************************************************/ 1583 /*************************************************************************/ 1584 /***** *****/ 1585 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/ 1586 /***** *****/ 1587 /*************************************************************************/ 1588 /*************************************************************************/ 1589 1590 /* snap a given width in scaled coordinates to one of the */ 1591 /* current standard widths */ 1592 1593 static FT_Pos 1594 af_latin2_snap_width( AF_Width widths, 1595 FT_UInt count, 1596 FT_Pos width ) 1597 { 1598 FT_UInt n; 1599 FT_Pos best = 64 + 32 + 2; 1600 FT_Pos reference = width; 1601 FT_Pos scaled; 1602 1603 1604 for ( n = 0; n < count; n++ ) 1605 { 1606 FT_Pos w; 1607 FT_Pos dist; 1608 1609 1610 w = widths[n].cur; 1611 dist = width - w; 1612 if ( dist < 0 ) 1613 dist = -dist; 1614 if ( dist < best ) 1615 { 1616 best = dist; 1617 reference = w; 1618 } 1619 } 1620 1621 scaled = FT_PIX_ROUND( reference ); 1622 1623 if ( width >= reference ) 1624 { 1625 if ( width < scaled + 48 ) 1626 width = reference; 1627 } 1628 else 1629 { 1630 if ( width > scaled - 48 ) 1631 width = reference; 1632 } 1633 1634 return width; 1635 } 1636 1637 1638 /* compute the snapped width of a given stem */ 1639 1640 static FT_Pos 1641 af_latin2_compute_stem_width( AF_GlyphHints hints, 1642 AF_Dimension dim, 1643 FT_Pos width, 1644 FT_UInt base_flags, 1645 FT_UInt stem_flags ) 1646 { 1647 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics; 1648 AF_LatinAxis axis = & metrics->axis[dim]; 1649 FT_Pos dist = width; 1650 FT_Int sign = 0; 1651 FT_Int vertical = ( dim == AF_DIMENSION_VERT ); 1652 1653 FT_UNUSED( base_flags ); 1654 1655 1656 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) || 1657 axis->extra_light ) 1658 return width; 1659 1660 if ( dist < 0 ) 1661 { 1662 dist = -width; 1663 sign = 1; 1664 } 1665 1666 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1667 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1668 { 1669 /* smooth hinting process: very lightly quantize the stem width */ 1670 1671 /* leave the widths of serifs alone */ 1672 1673 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) ) 1674 goto Done_Width; 1675 1676 #if 0 1677 else if ( ( base_flags & AF_EDGE_ROUND ) ) 1678 { 1679 if ( dist < 80 ) 1680 dist = 64; 1681 } 1682 else if ( dist < 56 ) 1683 dist = 56; 1684 #endif 1685 if ( axis->width_count > 0 ) 1686 { 1687 FT_Pos delta; 1688 1689 1690 /* compare to standard width */ 1691 if ( axis->width_count > 0 ) 1692 { 1693 delta = dist - axis->widths[0].cur; 1694 1695 if ( delta < 0 ) 1696 delta = -delta; 1697 1698 if ( delta < 40 ) 1699 { 1700 dist = axis->widths[0].cur; 1701 if ( dist < 48 ) 1702 dist = 48; 1703 1704 goto Done_Width; 1705 } 1706 } 1707 1708 if ( dist < 3 * 64 ) 1709 { 1710 delta = dist & 63; 1711 dist &= -64; 1712 1713 if ( delta < 10 ) 1714 dist += delta; 1715 1716 else if ( delta < 32 ) 1717 dist += 10; 1718 1719 else if ( delta < 54 ) 1720 dist += 54; 1721 1722 else 1723 dist += delta; 1724 } 1725 else 1726 dist = ( dist + 32 ) & ~63; 1727 } 1728 } 1729 else 1730 { 1731 /* strong hinting process: snap the stem width to integer pixels */ 1732 FT_Pos org_dist = dist; 1733 1734 1735 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist ); 1736 1737 if ( vertical ) 1738 { 1739 /* in the case of vertical hinting, always round */ 1740 /* the stem heights to integer pixels */ 1741 1742 if ( dist >= 64 ) 1743 dist = ( dist + 16 ) & ~63; 1744 else 1745 dist = 64; 1746 } 1747 else 1748 { 1749 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1750 { 1751 /* monochrome horizontal hinting: snap widths to integer pixels */ 1752 /* with a different threshold */ 1753 1754 if ( dist < 64 ) 1755 dist = 64; 1756 else 1757 dist = ( dist + 32 ) & ~63; 1758 } 1759 else 1760 { 1761 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1762 /* approach: we strengthen small stems, round stems whose size */ 1763 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1764 1765 if ( dist < 48 ) 1766 dist = ( dist + 64 ) >> 1; 1767 1768 else if ( dist < 128 ) 1769 { 1770 /* We only round to an integer width if the corresponding */ 1771 /* distortion is less than 1/4 pixel. Otherwise this */ 1772 /* makes everything worse since the diagonals, which are */ 1773 /* not hinted, appear a lot bolder or thinner than the */ 1774 /* vertical stems. */ 1775 1776 FT_Int delta; 1777 1778 1779 dist = ( dist + 22 ) & ~63; 1780 delta = dist - org_dist; 1781 if ( delta < 0 ) 1782 delta = -delta; 1783 1784 if ( delta >= 16 ) 1785 { 1786 dist = org_dist; 1787 if ( dist < 48 ) 1788 dist = ( dist + 64 ) >> 1; 1789 } 1790 } 1791 else 1792 /* round otherwise to prevent color fringes in LCD mode */ 1793 dist = ( dist + 32 ) & ~63; 1794 } 1795 } 1796 } 1797 1798 Done_Width: 1799 if ( sign ) 1800 dist = -dist; 1801 1802 return dist; 1803 } 1804 1805 1806 /* align one stem edge relative to the previous stem edge */ 1807 1808 static void 1809 af_latin2_align_linked_edge( AF_GlyphHints hints, 1810 AF_Dimension dim, 1811 AF_Edge base_edge, 1812 AF_Edge stem_edge ) 1813 { 1814 FT_Pos dist = stem_edge->opos - base_edge->opos; 1815 1816 FT_Pos fitted_width = af_latin2_compute_stem_width( hints, dim, dist, 1817 base_edge->flags, 1818 stem_edge->flags ); 1819 1820 1821 stem_edge->pos = base_edge->pos + fitted_width; 1822 1823 FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), " 1824 "dist was %.2f, now %.2f\n", 1825 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0, 1826 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 )); 1827 } 1828 1829 1830 static void 1831 af_latin2_align_serif_edge( AF_GlyphHints hints, 1832 AF_Edge base, 1833 AF_Edge serif ) 1834 { 1835 FT_UNUSED( hints ); 1836 1837 serif->pos = base->pos + ( serif->opos - base->opos ); 1838 } 1839 1840 1841 /*************************************************************************/ 1842 /*************************************************************************/ 1843 /*************************************************************************/ 1844 /**** ****/ 1845 /**** E D G E H I N T I N G ****/ 1846 /**** ****/ 1847 /*************************************************************************/ 1848 /*************************************************************************/ 1849 /*************************************************************************/ 1850 1851 1852 static void 1853 af_latin2_hint_edges( AF_GlyphHints hints, 1854 AF_Dimension dim ) 1855 { 1856 AF_AxisHints axis = &hints->axis[dim]; 1857 AF_Edge edges = axis->edges; 1858 AF_Edge edge_limit = edges + axis->num_edges; 1859 AF_Edge edge; 1860 AF_Edge anchor = NULL; 1861 FT_Int has_serifs = 0; 1862 FT_Pos anchor_drift = 0; 1863 1864 1865 1866 FT_TRACE5(( "==== hinting %s edges =====\n", 1867 dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" )); 1868 1869 /* we begin by aligning all stems relative to the blue zone */ 1870 /* if needed -- that's only for horizontal edges */ 1871 1872 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) ) 1873 { 1874 for ( edge = edges; edge < edge_limit; edge++ ) 1875 { 1876 AF_Width blue; 1877 AF_Edge edge1, edge2; 1878 1879 1880 if ( edge->flags & AF_EDGE_DONE ) 1881 continue; 1882 1883 blue = edge->blue_edge; 1884 edge1 = NULL; 1885 edge2 = edge->link; 1886 1887 if ( blue ) 1888 { 1889 edge1 = edge; 1890 } 1891 else if ( edge2 && edge2->blue_edge ) 1892 { 1893 blue = edge2->blue_edge; 1894 edge1 = edge2; 1895 edge2 = edge; 1896 } 1897 1898 if ( !edge1 ) 1899 continue; 1900 1901 FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), " 1902 "was (%.2f)\n", 1903 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0, 1904 edge1->pos / 64.0 )); 1905 1906 edge1->pos = blue->fit; 1907 edge1->flags |= AF_EDGE_DONE; 1908 1909 if ( edge2 && !edge2->blue_edge ) 1910 { 1911 af_latin2_align_linked_edge( hints, dim, edge1, edge2 ); 1912 edge2->flags |= AF_EDGE_DONE; 1913 } 1914 1915 if ( !anchor ) 1916 { 1917 anchor = edge; 1918 1919 anchor_drift = ( anchor->pos - anchor->opos ); 1920 if ( edge2 ) 1921 anchor_drift = ( anchor_drift + 1922 ( edge2->pos - edge2->opos ) ) >> 1; 1923 } 1924 } 1925 } 1926 1927 /* now we will align all stem edges, trying to maintain the */ 1928 /* relative order of stems in the glyph */ 1929 for ( edge = edges; edge < edge_limit; edge++ ) 1930 { 1931 AF_Edge edge2; 1932 1933 1934 if ( edge->flags & AF_EDGE_DONE ) 1935 continue; 1936 1937 /* skip all non-stem edges */ 1938 edge2 = edge->link; 1939 if ( !edge2 ) 1940 { 1941 has_serifs++; 1942 continue; 1943 } 1944 1945 /* now align the stem */ 1946 1947 /* this should not happen, but it's better to be safe */ 1948 if ( edge2->blue_edge ) 1949 { 1950 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1951 1952 af_latin2_align_linked_edge( hints, dim, edge2, edge ); 1953 edge->flags |= AF_EDGE_DONE; 1954 continue; 1955 } 1956 1957 if ( !anchor ) 1958 { 1959 FT_Pos org_len, org_center, cur_len; 1960 FT_Pos cur_pos1, error1, error2, u_off, d_off; 1961 1962 1963 org_len = edge2->opos - edge->opos; 1964 cur_len = af_latin2_compute_stem_width( hints, dim, org_len, 1965 edge->flags, 1966 edge2->flags ); 1967 if ( cur_len <= 64 ) 1968 u_off = d_off = 32; 1969 else 1970 { 1971 u_off = 38; 1972 d_off = 26; 1973 } 1974 1975 if ( cur_len < 96 ) 1976 { 1977 org_center = edge->opos + ( org_len >> 1 ); 1978 1979 cur_pos1 = FT_PIX_ROUND( org_center ); 1980 1981 error1 = org_center - ( cur_pos1 - u_off ); 1982 if ( error1 < 0 ) 1983 error1 = -error1; 1984 1985 error2 = org_center - ( cur_pos1 + d_off ); 1986 if ( error2 < 0 ) 1987 error2 = -error2; 1988 1989 if ( error1 < error2 ) 1990 cur_pos1 -= u_off; 1991 else 1992 cur_pos1 += d_off; 1993 1994 edge->pos = cur_pos1 - cur_len / 2; 1995 edge2->pos = edge->pos + cur_len; 1996 } 1997 else 1998 edge->pos = FT_PIX_ROUND( edge->opos ); 1999 2000 FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)" 2001 " snapped to (%.2f) (%.2f)\n", 2002 edge-edges, edge->opos / 64.0, 2003 edge2-edges, edge2->opos / 64.0, 2004 edge->pos / 64.0, edge2->pos / 64.0 )); 2005 anchor = edge; 2006 2007 edge->flags |= AF_EDGE_DONE; 2008 2009 af_latin2_align_linked_edge( hints, dim, edge, edge2 ); 2010 2011 edge2->flags |= AF_EDGE_DONE; 2012 2013 anchor_drift = ( ( anchor->pos - anchor->opos ) + 2014 ( edge2->pos - edge2->opos ) ) >> 1; 2015 2016 FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 )); 2017 } 2018 else 2019 { 2020 FT_Pos org_pos, org_len, org_center, cur_center, cur_len; 2021 FT_Pos org_left, org_right; 2022 2023 2024 org_pos = edge->opos + anchor_drift; 2025 org_len = edge2->opos - edge->opos; 2026 org_center = org_pos + ( org_len >> 1 ); 2027 2028 cur_len = af_latin2_compute_stem_width( hints, dim, org_len, 2029 edge->flags, 2030 edge2->flags ); 2031 2032 org_left = org_pos + ( ( org_len - cur_len ) >> 1 ); 2033 org_right = org_pos + ( ( org_len + cur_len ) >> 1 ); 2034 2035 FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ", 2036 org_left / 64.0, org_right / 64.0 )); 2037 cur_center = org_center; 2038 2039 if ( edge2->flags & AF_EDGE_DONE ) 2040 { 2041 FT_TRACE5(( "\n" )); 2042 edge->pos = edge2->pos - cur_len; 2043 } 2044 else 2045 { 2046 /* we want to compare several displacement, and choose 2047 * the one that increases fitness while minimizing 2048 * distortion as well 2049 */ 2050 FT_Pos displacements[6], scores[6], org, fit, delta; 2051 FT_UInt count = 0; 2052 2053 /* note: don't even try to fit tiny stems */ 2054 if ( cur_len < 32 ) 2055 { 2056 FT_TRACE5(( "tiny stem\n" )); 2057 goto AlignStem; 2058 } 2059 2060 /* if the span is within a single pixel, don't touch it */ 2061 if ( FT_PIX_FLOOR( org_left ) == FT_PIX_CEIL( org_right ) ) 2062 { 2063 FT_TRACE5(( "single pixel stem\n" )); 2064 goto AlignStem; 2065 } 2066 2067 if ( cur_len <= 96 ) 2068 { 2069 /* we want to avoid the absolute worst case which is 2070 * when the left and right edges of the span each represent 2071 * about 50% of the gray. we'd better want to change this 2072 * to 25/75%, since this is much more pleasant to the eye with 2073 * very acceptable distortion 2074 */ 2075 FT_Pos frac_left = org_left & 63; 2076 FT_Pos frac_right = org_right & 63; 2077 2078 if ( frac_left >= 22 && frac_left <= 42 && 2079 frac_right >= 22 && frac_right <= 42 ) 2080 { 2081 org = frac_left; 2082 fit = ( org <= 32 ) ? 16 : 48; 2083 delta = FT_ABS( fit - org ); 2084 displacements[count] = fit - org; 2085 scores[count++] = delta; 2086 FT_TRACE5(( "dispA=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2087 2088 org = frac_right; 2089 fit = ( org <= 32 ) ? 16 : 48; 2090 delta = FT_ABS( fit - org ); 2091 displacements[count] = fit - org; 2092 scores[count++] = delta; 2093 FT_TRACE5(( "dispB=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2094 } 2095 } 2096 2097 /* snapping the left edge to the grid */ 2098 org = org_left; 2099 fit = FT_PIX_ROUND( org ); 2100 delta = FT_ABS( fit - org ); 2101 displacements[count] = fit - org; 2102 scores[count++] = delta; 2103 FT_TRACE5(( "dispC=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2104 2105 /* snapping the right edge to the grid */ 2106 org = org_right; 2107 fit = FT_PIX_ROUND( org ); 2108 delta = FT_ABS( fit - org ); 2109 displacements[count] = fit - org; 2110 scores[count++] = delta; 2111 FT_TRACE5(( "dispD=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2112 2113 /* now find the best displacement */ 2114 { 2115 FT_Pos best_score = scores[0]; 2116 FT_Pos best_disp = displacements[0]; 2117 FT_UInt nn; 2118 2119 for ( nn = 1; nn < count; nn++ ) 2120 { 2121 if ( scores[nn] < best_score ) 2122 { 2123 best_score = scores[nn]; 2124 best_disp = displacements[nn]; 2125 } 2126 } 2127 2128 cur_center = org_center + best_disp; 2129 } 2130 FT_TRACE5(( "\n" )); 2131 } 2132 2133 AlignStem: 2134 edge->pos = cur_center - ( cur_len >> 1 ); 2135 edge2->pos = edge->pos + cur_len; 2136 2137 FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)" 2138 " snapped to (%.2f) and (%.2f)," 2139 " org_len=%.2f cur_len=%.2f\n", 2140 edge-edges, edge->opos / 64.0, 2141 edge2-edges, edge2->opos / 64.0, 2142 edge->pos / 64.0, edge2->pos / 64.0, 2143 org_len / 64.0, cur_len / 64.0 )); 2144 2145 edge->flags |= AF_EDGE_DONE; 2146 edge2->flags |= AF_EDGE_DONE; 2147 2148 if ( edge > edges && edge->pos < edge[-1].pos ) 2149 { 2150 FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n", 2151 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 )); 2152 edge->pos = edge[-1].pos; 2153 } 2154 } 2155 } 2156 2157 /* make sure that lowercase m's maintain their symmetry */ 2158 2159 /* In general, lowercase m's have six vertical edges if they are sans */ 2160 /* serif, or twelve if they are with serifs. This implementation is */ 2161 /* based on that assumption, and seems to work very well with most */ 2162 /* faces. However, if for a certain face this assumption is not */ 2163 /* true, the m is just rendered like before. In addition, any stem */ 2164 /* correction will only be applied to symmetrical glyphs (even if the */ 2165 /* glyph is not an m), so the potential for unwanted distortion is */ 2166 /* relatively low. */ 2167 2168 /* We don't handle horizontal edges since we can't easily assure that */ 2169 /* the third (lowest) stem aligns with the base line; it might end up */ 2170 /* one pixel higher or lower. */ 2171 2172 #if 0 2173 { 2174 FT_Int n_edges = edge_limit - edges; 2175 2176 2177 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 2178 { 2179 AF_Edge edge1, edge2, edge3; 2180 FT_Pos dist1, dist2, span, delta; 2181 2182 2183 if ( n_edges == 6 ) 2184 { 2185 edge1 = edges; 2186 edge2 = edges + 2; 2187 edge3 = edges + 4; 2188 } 2189 else 2190 { 2191 edge1 = edges + 1; 2192 edge2 = edges + 5; 2193 edge3 = edges + 9; 2194 } 2195 2196 dist1 = edge2->opos - edge1->opos; 2197 dist2 = edge3->opos - edge2->opos; 2198 2199 span = dist1 - dist2; 2200 if ( span < 0 ) 2201 span = -span; 2202 2203 if ( span < 8 ) 2204 { 2205 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2206 edge3->pos -= delta; 2207 if ( edge3->link ) 2208 edge3->link->pos -= delta; 2209 2210 /* move the serifs along with the stem */ 2211 if ( n_edges == 12 ) 2212 { 2213 ( edges + 8 )->pos -= delta; 2214 ( edges + 11 )->pos -= delta; 2215 } 2216 2217 edge3->flags |= AF_EDGE_DONE; 2218 if ( edge3->link ) 2219 edge3->link->flags |= AF_EDGE_DONE; 2220 } 2221 } 2222 } 2223 #endif 2224 2225 if ( has_serifs || !anchor ) 2226 { 2227 /* 2228 * now hint the remaining edges (serifs and single) in order 2229 * to complete our processing 2230 */ 2231 for ( edge = edges; edge < edge_limit; edge++ ) 2232 { 2233 FT_Pos delta; 2234 2235 2236 if ( edge->flags & AF_EDGE_DONE ) 2237 continue; 2238 2239 delta = 1000; 2240 2241 if ( edge->serif ) 2242 { 2243 delta = edge->serif->opos - edge->opos; 2244 if ( delta < 0 ) 2245 delta = -delta; 2246 } 2247 2248 if ( delta < 64 + 16 ) 2249 { 2250 af_latin2_align_serif_edge( hints, edge->serif, edge ); 2251 FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)" 2252 " aligned to (%.2f)\n", 2253 edge-edges, edge->opos / 64.0, 2254 edge->serif - edges, edge->serif->opos / 64.0, 2255 edge->pos / 64.0 )); 2256 } 2257 else if ( !anchor ) 2258 { 2259 FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)" 2260 " snapped to (%.2f)\n", 2261 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2262 edge->pos = FT_PIX_ROUND( edge->opos ); 2263 anchor = edge; 2264 } 2265 else 2266 { 2267 AF_Edge before, after; 2268 2269 2270 for ( before = edge - 1; before >= edges; before-- ) 2271 if ( before->flags & AF_EDGE_DONE ) 2272 break; 2273 2274 for ( after = edge + 1; after < edge_limit; after++ ) 2275 if ( after->flags & AF_EDGE_DONE ) 2276 break; 2277 2278 if ( before >= edges && before < edge && 2279 after < edge_limit && after > edge ) 2280 { 2281 if ( after->opos == before->opos ) 2282 edge->pos = before->pos; 2283 else 2284 edge->pos = before->pos + 2285 FT_MulDiv( edge->opos - before->opos, 2286 after->pos - before->pos, 2287 after->opos - before->opos ); 2288 FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)" 2289 " from %d (opos=%.2f)\n", 2290 edge-edges, edge->opos / 64.0, edge->pos / 64.0, 2291 before - edges, before->opos / 64.0 )); 2292 } 2293 else 2294 { 2295 edge->pos = anchor->pos + 2296 ( ( edge->opos - anchor->opos + 16 ) & ~31 ); 2297 2298 FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)" 2299 " snapped to (%.2f)\n", 2300 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2301 } 2302 } 2303 2304 edge->flags |= AF_EDGE_DONE; 2305 2306 if ( edge > edges && edge->pos < edge[-1].pos ) 2307 edge->pos = edge[-1].pos; 2308 2309 if ( edge + 1 < edge_limit && 2310 edge[1].flags & AF_EDGE_DONE && 2311 edge->pos > edge[1].pos ) 2312 edge->pos = edge[1].pos; 2313 } 2314 } 2315 } 2316 2317 2318 static FT_Error 2319 af_latin2_hints_apply( FT_UInt glyph_index, 2320 AF_GlyphHints hints, 2321 FT_Outline* outline, 2322 AF_LatinMetrics metrics ) 2323 { 2324 FT_Error error; 2325 int dim; 2326 2327 FT_UNUSED( glyph_index ); 2328 2329 2330 error = af_glyph_hints_reload( hints, outline ); 2331 if ( error ) 2332 goto Exit; 2333 2334 /* analyze glyph outline */ 2335 #ifdef AF_CONFIG_OPTION_USE_WARPER 2336 if ( ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT && 2337 AF_HINTS_DO_WARP( hints ) ) || 2338 AF_HINTS_DO_HORIZONTAL( hints ) ) 2339 #else 2340 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2341 #endif 2342 { 2343 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2344 if ( error ) 2345 goto Exit; 2346 } 2347 2348 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2349 { 2350 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT ); 2351 if ( error ) 2352 goto Exit; 2353 2354 af_latin2_hints_compute_blue_edges( hints, metrics ); 2355 } 2356 2357 /* grid-fit the outline */ 2358 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2359 { 2360 #ifdef AF_CONFIG_OPTION_USE_WARPER 2361 if ( dim == AF_DIMENSION_HORZ && 2362 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT && 2363 AF_HINTS_DO_WARP( hints ) ) 2364 { 2365 AF_WarperRec warper; 2366 FT_Fixed scale; 2367 FT_Pos delta; 2368 2369 2370 af_warper_compute( &warper, hints, dim, &scale, &delta ); 2371 af_glyph_hints_scale_dim( hints, dim, scale, delta ); 2372 continue; 2373 } 2374 #endif /* AF_CONFIG_OPTION_USE_WARPER */ 2375 2376 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2377 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2378 { 2379 af_latin2_hint_edges( hints, (AF_Dimension)dim ); 2380 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim ); 2381 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2382 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2383 } 2384 } 2385 af_glyph_hints_save( hints, outline ); 2386 2387 Exit: 2388 return error; 2389 } 2390 2391 2392 /*************************************************************************/ 2393 /*************************************************************************/ 2394 /***** *****/ 2395 /***** L A T I N S C R I P T C L A S S *****/ 2396 /***** *****/ 2397 /*************************************************************************/ 2398 /*************************************************************************/ 2399 2400 2401 AF_DEFINE_WRITING_SYSTEM_CLASS( 2402 af_latin2_writing_system_class, 2403 2404 AF_WRITING_SYSTEM_LATIN2, 2405 2406 sizeof ( AF_LatinMetricsRec ), 2407 2408 (AF_WritingSystem_InitMetricsFunc) af_latin2_metrics_init, 2409 (AF_WritingSystem_ScaleMetricsFunc)af_latin2_metrics_scale, 2410 (AF_WritingSystem_DoneMetricsFunc) NULL, 2411 (AF_WritingSystem_GetStdWidthsFunc)af_latin2_get_standard_widths, 2412 2413 (AF_WritingSystem_InitHintsFunc) af_latin2_hints_init, 2414 (AF_WritingSystem_ApplyHintsFunc) af_latin2_hints_apply 2415 ) 2416 2417 2418 /* END */ 2419
