1 /***************************************************************************/ 2 /* */ 3 /* aflatin2.c */ 4 /* */ 5 /* Auto-fitter hinting routines for latin script (body). */ 6 /* */ 7 /* Copyright 2003-2013 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 19 #include FT_ADVANCES_H 20 21 #include "afglobal.h" 22 #include "aflatin.h" 23 #include "aflatin2.h" 24 #include "aferrors.h" 25 26 27 #ifdef AF_CONFIG_OPTION_USE_WARPER 28 #include "afwarp.h" 29 #endif 30 31 32 /*************************************************************************/ 33 /* */ 34 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 35 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 36 /* messages during execution. */ 37 /* */ 38 #undef FT_COMPONENT 39 #define FT_COMPONENT trace_aflatin2 40 41 42 FT_LOCAL_DEF( FT_Error ) 43 af_latin2_hints_compute_segments( AF_GlyphHints hints, 44 AF_Dimension dim ); 45 46 FT_LOCAL_DEF( void ) 47 af_latin2_hints_link_segments( AF_GlyphHints hints, 48 AF_Dimension dim ); 49 50 /*************************************************************************/ 51 /*************************************************************************/ 52 /***** *****/ 53 /***** L A T I N G L O B A L M E T R I C S *****/ 54 /***** *****/ 55 /*************************************************************************/ 56 /*************************************************************************/ 57 58 FT_LOCAL_DEF( void ) af_latin2_metrics_init_widths(AF_LatinMetrics metrics,FT_Face face)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( face, 80 metrics->root.clazz->standard_char ); 81 if ( glyph_index == 0 ) 82 goto Exit; 83 84 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 85 if ( error || face->glyph->outline.n_points <= 0 ) 86 goto Exit; 87 88 FT_ZERO( dummy ); 89 90 dummy->units_per_em = metrics->units_per_em; 91 scaler->x_scale = scaler->y_scale = 0x10000L; 92 scaler->x_delta = scaler->y_delta = 0; 93 scaler->face = face; 94 scaler->render_mode = FT_RENDER_MODE_NORMAL; 95 scaler->flags = 0; 96 97 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)dummy ); 98 99 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 100 if ( error ) 101 goto Exit; 102 103 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 104 { 105 AF_LatinAxis axis = &metrics->axis[dim]; 106 AF_AxisHints axhints = &hints->axis[dim]; 107 AF_Segment seg, limit, link; 108 FT_UInt num_widths = 0; 109 110 111 error = af_latin2_hints_compute_segments( hints, 112 (AF_Dimension)dim ); 113 if ( error ) 114 goto Exit; 115 116 af_latin2_hints_link_segments( hints, 117 (AF_Dimension)dim ); 118 119 seg = axhints->segments; 120 limit = seg + axhints->num_segments; 121 122 for ( ; seg < limit; seg++ ) 123 { 124 link = seg->link; 125 126 /* we only consider stem segments there! */ 127 if ( link && link->link == seg && link > seg ) 128 { 129 FT_Pos dist; 130 131 132 dist = seg->pos - link->pos; 133 if ( dist < 0 ) 134 dist = -dist; 135 136 if ( num_widths < AF_LATIN_MAX_WIDTHS ) 137 axis->widths[num_widths++].org = dist; 138 } 139 } 140 141 af_sort_widths( num_widths, axis->widths ); 142 axis->width_count = num_widths; 143 } 144 145 Exit: 146 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 147 { 148 AF_LatinAxis axis = &metrics->axis[dim]; 149 FT_Pos stdw; 150 151 152 stdw = ( axis->width_count > 0 ) 153 ? axis->widths[0].org 154 : AF_LATIN_CONSTANT( metrics, 50 ); 155 156 /* let's try 20% of the smallest width */ 157 axis->edge_distance_threshold = stdw / 5; 158 axis->standard_width = stdw; 159 axis->extra_light = 0; 160 } 161 } 162 163 af_glyph_hints_done( hints ); 164 } 165 166 167 168 #define AF_LATIN_MAX_TEST_CHARACTERS 12 169 170 171 static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES] 172 [AF_LATIN_MAX_TEST_CHARACTERS+1] = 173 { 174 "THEZOCQS", 175 "HEZLOCUS", 176 "fijkdbh", 177 "xzroesc", 178 "xzroesc", 179 "pqgjy" 180 }; 181 182 183 static void af_latin2_metrics_init_blues(AF_LatinMetrics metrics,FT_Face face)184 af_latin2_metrics_init_blues( AF_LatinMetrics metrics, 185 FT_Face face ) 186 { 187 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS]; 188 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS]; 189 FT_Int num_flats; 190 FT_Int num_rounds; 191 FT_Int bb; 192 AF_LatinBlue blue; 193 FT_Error error; 194 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT]; 195 FT_GlyphSlot glyph = face->glyph; 196 197 198 /* we compute the blues simply by loading each character from the */ 199 /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */ 200 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */ 201 202 FT_TRACE5(( "blue zones computation\n" 203 "======================\n\n" )); 204 205 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 206 { 207 const char* p = af_latin2_blue_chars[bb]; 208 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS; 209 FT_Pos* blue_ref; 210 FT_Pos* blue_shoot; 211 212 213 FT_TRACE5(( "blue zone %d:\n", bb )); 214 215 num_flats = 0; 216 num_rounds = 0; 217 218 for ( ; p < limit && *p; p++ ) 219 { 220 FT_UInt glyph_index; 221 FT_Int best_point, best_y, best_first, best_last; 222 FT_Vector* points; 223 FT_Bool round; 224 225 226 /* load the character in the face -- skip unknown or empty ones */ 227 glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p ); 228 if ( glyph_index == 0 ) 229 continue; 230 231 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 232 if ( error || glyph->outline.n_points <= 0 ) 233 continue; 234 235 /* now compute min or max point indices and coordinates */ 236 points = glyph->outline.points; 237 best_point = -1; 238 best_y = 0; /* make compiler happy */ 239 best_first = 0; /* ditto */ 240 best_last = 0; /* ditto */ 241 242 { 243 FT_Int nn; 244 FT_Int first = 0; 245 FT_Int last = -1; 246 247 248 for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ ) 249 { 250 FT_Int old_best_point = best_point; 251 FT_Int pp; 252 253 254 last = glyph->outline.contours[nn]; 255 256 /* Avoid single-point contours since they are never rasterized. */ 257 /* In some fonts, they correspond to mark attachment points */ 258 /* which are way outside of the glyph's real outline. */ 259 if ( last == first ) 260 continue; 261 262 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 263 { 264 for ( pp = first; pp <= last; pp++ ) 265 if ( best_point < 0 || points[pp].y > best_y ) 266 { 267 best_point = pp; 268 best_y = points[pp].y; 269 } 270 } 271 else 272 { 273 for ( pp = first; pp <= last; pp++ ) 274 if ( best_point < 0 || points[pp].y < best_y ) 275 { 276 best_point = pp; 277 best_y = points[pp].y; 278 } 279 } 280 281 if ( best_point != old_best_point ) 282 { 283 best_first = first; 284 best_last = last; 285 } 286 } 287 FT_TRACE5(( " %c %d", *p, best_y )); 288 } 289 290 /* now check whether the point belongs to a straight or round */ 291 /* segment; we first need to find in which contour the extremum */ 292 /* lies, then inspect its previous and next points */ 293 { 294 FT_Pos best_x = points[best_point].x; 295 FT_Int start, end, prev, next; 296 FT_Pos dist; 297 298 299 /* now look for the previous and next points that are not on the */ 300 /* same Y coordinate. Threshold the `closeness'... */ 301 start = end = best_point; 302 303 do 304 { 305 prev = start - 1; 306 if ( prev < best_first ) 307 prev = best_last; 308 309 dist = FT_ABS( points[prev].y - best_y ); 310 /* accept a small distance or a small angle (both values are */ 311 /* heuristic; value 20 corresponds to approx. 2.9 degrees) */ 312 if ( dist > 5 ) 313 if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist ) 314 break; 315 316 start = prev; 317 318 } while ( start != best_point ); 319 320 do 321 { 322 next = end + 1; 323 if ( next > best_last ) 324 next = best_first; 325 326 dist = FT_ABS( points[next].y - best_y ); 327 if ( dist > 5 ) 328 if ( FT_ABS( points[next].x - best_x ) <= 20 * dist ) 329 break; 330 331 end = next; 332 333 } while ( end != best_point ); 334 335 /* now, set the `round' flag depending on the segment's kind */ 336 round = FT_BOOL( 337 FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON || 338 FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON ); 339 340 FT_TRACE5(( " (%s)\n", round ? "round" : "flat" )); 341 } 342 343 if ( round ) 344 rounds[num_rounds++] = best_y; 345 else 346 flats[num_flats++] = best_y; 347 } 348 349 if ( num_flats == 0 && num_rounds == 0 ) 350 { 351 /* 352 * we couldn't find a single glyph to compute this blue zone, 353 * we will simply ignore it then 354 */ 355 FT_TRACE5(( " empty\n" )); 356 continue; 357 } 358 359 /* we have computed the contents of the `rounds' and `flats' tables, */ 360 /* now determine the reference and overshoot position of the blue -- */ 361 /* we simply take the median value after a simple sort */ 362 af_sort_pos( num_rounds, rounds ); 363 af_sort_pos( num_flats, flats ); 364 365 blue = & axis->blues[axis->blue_count]; 366 blue_ref = & blue->ref.org; 367 blue_shoot = & blue->shoot.org; 368 369 axis->blue_count++; 370 371 if ( num_flats == 0 ) 372 { 373 *blue_ref = 374 *blue_shoot = rounds[num_rounds / 2]; 375 } 376 else if ( num_rounds == 0 ) 377 { 378 *blue_ref = 379 *blue_shoot = flats[num_flats / 2]; 380 } 381 else 382 { 383 *blue_ref = flats[num_flats / 2]; 384 *blue_shoot = rounds[num_rounds / 2]; 385 } 386 387 /* there are sometimes problems: if the overshoot position of top */ 388 /* zones is under its reference position, or the opposite for bottom */ 389 /* zones. We must thus check everything there and correct the errors */ 390 if ( *blue_shoot != *blue_ref ) 391 { 392 FT_Pos ref = *blue_ref; 393 FT_Pos shoot = *blue_shoot; 394 FT_Bool over_ref = FT_BOOL( shoot > ref ); 395 396 397 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref ) 398 { 399 *blue_ref = 400 *blue_shoot = ( shoot + ref ) / 2; 401 402 FT_TRACE5(( " [overshoot smaller than reference," 403 " taking mean value]\n" )); 404 } 405 } 406 407 blue->flags = 0; 408 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 409 blue->flags |= AF_LATIN_BLUE_TOP; 410 411 /* 412 * The following flags is used later to adjust the y and x scales 413 * in order to optimize the pixel grid alignment of the top of small 414 * letters. 415 */ 416 if ( bb == AF_LATIN_BLUE_SMALL_TOP ) 417 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT; 418 419 FT_TRACE5(( " -> reference = %ld\n" 420 " overshoot = %ld\n", 421 *blue_ref, *blue_shoot )); 422 } 423 424 return; 425 } 426 427 428 FT_LOCAL_DEF( void ) af_latin2_metrics_check_digits(AF_LatinMetrics metrics,FT_Face face)429 af_latin2_metrics_check_digits( AF_LatinMetrics metrics, 430 FT_Face face ) 431 { 432 FT_UInt i; 433 FT_Bool started = 0, same_width = 1; 434 FT_Fixed advance, old_advance = 0; 435 436 437 /* check whether all ASCII digits have the same advance width; */ 438 /* digit `0' is 0x30 in all supported charmaps */ 439 for ( i = 0x30; i <= 0x39; i++ ) 440 { 441 FT_UInt glyph_index; 442 443 444 glyph_index = FT_Get_Char_Index( face, i ); 445 if ( glyph_index == 0 ) 446 continue; 447 448 if ( FT_Get_Advance( face, glyph_index, 449 FT_LOAD_NO_SCALE | 450 FT_LOAD_NO_HINTING | 451 FT_LOAD_IGNORE_TRANSFORM, 452 &advance ) ) 453 continue; 454 455 if ( started ) 456 { 457 if ( advance != old_advance ) 458 { 459 same_width = 0; 460 break; 461 } 462 } 463 else 464 { 465 old_advance = advance; 466 started = 1; 467 } 468 } 469 470 metrics->root.digits_have_same_width = same_width; 471 } 472 473 474 FT_LOCAL_DEF( FT_Error ) af_latin2_metrics_init(AF_LatinMetrics metrics,FT_Face face)475 af_latin2_metrics_init( AF_LatinMetrics metrics, 476 FT_Face face ) 477 { 478 FT_Error error = FT_Err_Ok; 479 FT_CharMap oldmap = face->charmap; 480 FT_UInt ee; 481 482 static const FT_Encoding latin_encodings[] = 483 { 484 FT_ENCODING_UNICODE, 485 FT_ENCODING_APPLE_ROMAN, 486 FT_ENCODING_ADOBE_STANDARD, 487 FT_ENCODING_ADOBE_LATIN_1, 488 FT_ENCODING_NONE /* end of list */ 489 }; 490 491 492 metrics->units_per_em = face->units_per_EM; 493 494 /* do we have a latin charmap in there? */ 495 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ ) 496 { 497 error = FT_Select_Charmap( face, latin_encodings[ee] ); 498 if ( !error ) 499 break; 500 } 501 502 if ( !error ) 503 { 504 af_latin2_metrics_init_widths( metrics, face ); 505 af_latin2_metrics_init_blues( metrics, face ); 506 af_latin2_metrics_check_digits( metrics, face ); 507 } 508 509 FT_Set_Charmap( face, oldmap ); 510 return FT_Err_Ok; 511 } 512 513 514 static void af_latin2_metrics_scale_dim(AF_LatinMetrics metrics,AF_Scaler scaler,AF_Dimension dim)515 af_latin2_metrics_scale_dim( AF_LatinMetrics metrics, 516 AF_Scaler scaler, 517 AF_Dimension dim ) 518 { 519 FT_Fixed scale; 520 FT_Pos delta; 521 AF_LatinAxis axis; 522 FT_UInt nn; 523 524 525 if ( dim == AF_DIMENSION_HORZ ) 526 { 527 scale = scaler->x_scale; 528 delta = scaler->x_delta; 529 } 530 else 531 { 532 scale = scaler->y_scale; 533 delta = scaler->y_delta; 534 } 535 536 axis = &metrics->axis[dim]; 537 538 if ( axis->org_scale == scale && axis->org_delta == delta ) 539 return; 540 541 axis->org_scale = scale; 542 axis->org_delta = delta; 543 544 /* 545 * correct Y scale to optimize the alignment of the top of small 546 * letters to the pixel grid 547 */ 548 if ( dim == AF_DIMENSION_VERT ) 549 { 550 AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT]; 551 AF_LatinBlue blue = NULL; 552 553 554 for ( nn = 0; nn < vaxis->blue_count; nn++ ) 555 { 556 if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT ) 557 { 558 blue = &vaxis->blues[nn]; 559 break; 560 } 561 } 562 563 if ( blue ) 564 { 565 FT_Pos scaled; 566 FT_Pos threshold; 567 FT_Pos fitted; 568 FT_UInt limit; 569 FT_UInt ppem; 570 571 572 scaled = FT_MulFix( blue->shoot.org, scaler->y_scale ); 573 ppem = metrics->root.scaler.face->size->metrics.x_ppem; 574 limit = metrics->root.globals->increase_x_height; 575 threshold = 40; 576 577 /* if the `increase-x-height' property is active, */ 578 /* we round up much more often */ 579 if ( limit && 580 ppem <= limit && 581 ppem >= AF_PROP_INCREASE_X_HEIGHT_MIN ) 582 threshold = 52; 583 584 fitted = ( scaled + threshold ) & ~63; 585 586 #if 1 587 if ( scaled != fitted ) 588 { 589 scale = FT_MulDiv( scale, fitted, scaled ); 590 FT_TRACE5(( "== scaled x-top = %.2g" 591 " fitted = %.2g, scaling = %.4g\n", 592 scaled / 64.0, fitted / 64.0, 593 ( fitted * 1.0 ) / scaled )); 594 } 595 #endif 596 } 597 } 598 599 axis->scale = scale; 600 axis->delta = delta; 601 602 if ( dim == AF_DIMENSION_HORZ ) 603 { 604 metrics->root.scaler.x_scale = scale; 605 metrics->root.scaler.x_delta = delta; 606 } 607 else 608 { 609 metrics->root.scaler.y_scale = scale; 610 metrics->root.scaler.y_delta = delta; 611 } 612 613 /* scale the standard widths */ 614 for ( nn = 0; nn < axis->width_count; nn++ ) 615 { 616 AF_Width width = axis->widths + nn; 617 618 619 width->cur = FT_MulFix( width->org, scale ); 620 width->fit = width->cur; 621 } 622 623 /* an extra-light axis corresponds to a standard width that is */ 624 /* smaller than 5/8 pixels */ 625 axis->extra_light = 626 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 ); 627 628 if ( dim == AF_DIMENSION_VERT ) 629 { 630 /* scale the blue zones */ 631 for ( nn = 0; nn < axis->blue_count; nn++ ) 632 { 633 AF_LatinBlue blue = &axis->blues[nn]; 634 FT_Pos dist; 635 636 637 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 638 blue->ref.fit = blue->ref.cur; 639 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 640 blue->shoot.fit = blue->shoot.cur; 641 blue->flags &= ~AF_LATIN_BLUE_ACTIVE; 642 643 /* a blue zone is only active if it is less than 3/4 pixels tall */ 644 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 645 if ( dist <= 48 && dist >= -48 ) 646 { 647 FT_Pos delta1, delta2; 648 649 delta1 = blue->shoot.org - blue->ref.org; 650 delta2 = delta1; 651 if ( delta1 < 0 ) 652 delta2 = -delta2; 653 654 delta2 = FT_MulFix( delta2, scale ); 655 656 if ( delta2 < 32 ) 657 delta2 = 0; 658 else if ( delta2 < 64 ) 659 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 660 else 661 delta2 = FT_PIX_ROUND( delta2 ); 662 663 if ( delta1 < 0 ) 664 delta2 = -delta2; 665 666 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 667 blue->shoot.fit = blue->ref.fit + delta2; 668 669 FT_TRACE5(( ">> activating blue zone %d:" 670 " ref.cur=%.2g ref.fit=%.2g" 671 " shoot.cur=%.2g shoot.fit=%.2g\n", 672 nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0, 673 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 )); 674 675 blue->flags |= AF_LATIN_BLUE_ACTIVE; 676 } 677 } 678 } 679 } 680 681 682 FT_LOCAL_DEF( void ) af_latin2_metrics_scale(AF_LatinMetrics metrics,AF_Scaler scaler)683 af_latin2_metrics_scale( AF_LatinMetrics metrics, 684 AF_Scaler scaler ) 685 { 686 metrics->root.scaler.render_mode = scaler->render_mode; 687 metrics->root.scaler.face = scaler->face; 688 metrics->root.scaler.flags = scaler->flags; 689 690 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 691 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 692 } 693 694 695 /*************************************************************************/ 696 /*************************************************************************/ 697 /***** *****/ 698 /***** L A T I N G L Y P H A N A L Y S I S *****/ 699 /***** *****/ 700 /*************************************************************************/ 701 /*************************************************************************/ 702 703 #define SORT_SEGMENTS 704 705 FT_LOCAL_DEF( FT_Error ) af_latin2_hints_compute_segments(AF_GlyphHints hints,AF_Dimension dim)706 af_latin2_hints_compute_segments( AF_GlyphHints hints, 707 AF_Dimension dim ) 708 { 709 AF_AxisHints axis = &hints->axis[dim]; 710 FT_Memory memory = hints->memory; 711 FT_Error error = FT_Err_Ok; 712 AF_Segment segment = NULL; 713 AF_SegmentRec seg0; 714 AF_Point* contour = hints->contours; 715 AF_Point* contour_limit = contour + hints->num_contours; 716 AF_Direction major_dir, segment_dir; 717 718 719 FT_ZERO( &seg0 ); 720 seg0.score = 32000; 721 seg0.flags = AF_EDGE_NORMAL; 722 723 major_dir = (AF_Direction)FT_ABS( axis->major_dir ); 724 segment_dir = major_dir; 725 726 axis->num_segments = 0; 727 728 /* set up (u,v) in each point */ 729 if ( dim == AF_DIMENSION_HORZ ) 730 { 731 AF_Point point = hints->points; 732 AF_Point limit = point + hints->num_points; 733 734 735 for ( ; point < limit; point++ ) 736 { 737 point->u = point->fx; 738 point->v = point->fy; 739 } 740 } 741 else 742 { 743 AF_Point point = hints->points; 744 AF_Point limit = point + hints->num_points; 745 746 747 for ( ; point < limit; point++ ) 748 { 749 point->u = point->fy; 750 point->v = point->fx; 751 } 752 } 753 754 /* do each contour separately */ 755 for ( ; contour < contour_limit; contour++ ) 756 { 757 AF_Point point = contour[0]; 758 AF_Point start = point; 759 AF_Point last = point->prev; 760 761 762 if ( point == last ) /* skip singletons -- just in case */ 763 continue; 764 765 /* already on an edge ?, backtrack to find its start */ 766 if ( FT_ABS( point->in_dir ) == major_dir ) 767 { 768 point = point->prev; 769 770 while ( point->in_dir == start->in_dir ) 771 point = point->prev; 772 } 773 else /* otherwise, find first segment start, if any */ 774 { 775 while ( FT_ABS( point->out_dir ) != major_dir ) 776 { 777 point = point->next; 778 779 if ( point == start ) 780 goto NextContour; 781 } 782 } 783 784 start = point; 785 786 for (;;) 787 { 788 AF_Point first; 789 FT_Pos min_u, min_v, max_u, max_v; 790 791 /* we're at the start of a new segment */ 792 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir && 793 point->in_dir != point->out_dir ); 794 first = point; 795 796 min_u = max_u = point->u; 797 min_v = max_v = point->v; 798 799 point = point->next; 800 801 while ( point->out_dir == first->out_dir ) 802 { 803 point = point->next; 804 805 if ( point->u < min_u ) 806 min_u = point->u; 807 808 if ( point->u > max_u ) 809 max_u = point->u; 810 } 811 812 if ( point->v < min_v ) 813 min_v = point->v; 814 815 if ( point->v > max_v ) 816 max_v = point->v; 817 818 /* record new segment */ 819 error = af_axis_hints_new_segment( axis, memory, &segment ); 820 if ( error ) 821 goto Exit; 822 823 segment[0] = seg0; 824 segment->dir = first->out_dir; 825 segment->first = first; 826 segment->last = point; 827 segment->pos = (FT_Short)( ( min_u + max_u ) >> 1 ); 828 segment->min_coord = (FT_Short) min_v; 829 segment->max_coord = (FT_Short) max_v; 830 segment->height = (FT_Short)( max_v - min_v ); 831 832 /* a segment is round if it doesn't have successive */ 833 /* on-curve points. */ 834 { 835 AF_Point pt = first; 836 AF_Point last = point; 837 AF_Flags f0 = (AF_Flags)( pt->flags & AF_FLAG_CONTROL ); 838 AF_Flags f1; 839 840 841 segment->flags &= ~AF_EDGE_ROUND; 842 843 for ( ; pt != last; f0 = f1 ) 844 { 845 pt = pt->next; 846 f1 = (AF_Flags)( pt->flags & AF_FLAG_CONTROL ); 847 848 if ( !f0 && !f1 ) 849 break; 850 851 if ( pt == last ) 852 segment->flags |= AF_EDGE_ROUND; 853 } 854 } 855 856 /* this can happen in the case of a degenerate contour 857 * e.g. a 2-point vertical contour 858 */ 859 if ( point == start ) 860 break; 861 862 /* jump to the start of the next segment, if any */ 863 while ( FT_ABS( point->out_dir ) != major_dir ) 864 { 865 point = point->next; 866 867 if ( point == start ) 868 goto NextContour; 869 } 870 } 871 872 NextContour: 873 ; 874 } /* contours */ 875 876 /* now slightly increase the height of segments when this makes */ 877 /* sense -- this is used to better detect and ignore serifs */ 878 { 879 AF_Segment segments = axis->segments; 880 AF_Segment segments_end = segments + axis->num_segments; 881 882 883 for ( segment = segments; segment < segments_end; segment++ ) 884 { 885 AF_Point first = segment->first; 886 AF_Point last = segment->last; 887 AF_Point p; 888 FT_Pos first_v = first->v; 889 FT_Pos last_v = last->v; 890 891 892 if ( first == last ) 893 continue; 894 895 if ( first_v < last_v ) 896 { 897 p = first->prev; 898 if ( p->v < first_v ) 899 segment->height = (FT_Short)( segment->height + 900 ( ( first_v - p->v ) >> 1 ) ); 901 902 p = last->next; 903 if ( p->v > last_v ) 904 segment->height = (FT_Short)( segment->height + 905 ( ( p->v - last_v ) >> 1 ) ); 906 } 907 else 908 { 909 p = first->prev; 910 if ( p->v > first_v ) 911 segment->height = (FT_Short)( segment->height + 912 ( ( p->v - first_v ) >> 1 ) ); 913 914 p = last->next; 915 if ( p->v < last_v ) 916 segment->height = (FT_Short)( segment->height + 917 ( ( last_v - p->v ) >> 1 ) ); 918 } 919 } 920 } 921 922 #ifdef AF_SORT_SEGMENTS 923 /* place all segments with a negative direction to the start 924 * of the array, used to speed up segment linking later... 925 */ 926 { 927 AF_Segment segments = axis->segments; 928 FT_UInt count = axis->num_segments; 929 FT_UInt ii, jj; 930 931 for ( ii = 0; ii < count; ii++ ) 932 { 933 if ( segments[ii].dir > 0 ) 934 { 935 for ( jj = ii + 1; jj < count; jj++ ) 936 { 937 if ( segments[jj].dir < 0 ) 938 { 939 AF_SegmentRec tmp; 940 941 942 tmp = segments[ii]; 943 segments[ii] = segments[jj]; 944 segments[jj] = tmp; 945 946 break; 947 } 948 } 949 950 if ( jj == count ) 951 break; 952 } 953 } 954 axis->mid_segments = ii; 955 } 956 #endif 957 958 Exit: 959 return error; 960 } 961 962 963 FT_LOCAL_DEF( void ) af_latin2_hints_link_segments(AF_GlyphHints hints,AF_Dimension dim)964 af_latin2_hints_link_segments( AF_GlyphHints hints, 965 AF_Dimension dim ) 966 { 967 AF_AxisHints axis = &hints->axis[dim]; 968 AF_Segment segments = axis->segments; 969 AF_Segment segment_limit = segments + axis->num_segments; 970 #ifdef AF_SORT_SEGMENTS 971 AF_Segment segment_mid = segments + axis->mid_segments; 972 #endif 973 FT_Pos len_threshold, len_score; 974 AF_Segment seg1, seg2; 975 976 977 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 978 if ( len_threshold == 0 ) 979 len_threshold = 1; 980 981 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 ); 982 983 #ifdef AF_SORT_SEGMENTS 984 for ( seg1 = segments; seg1 < segment_mid; seg1++ ) 985 { 986 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last ) 987 continue; 988 989 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ ) 990 #else 991 /* now compare each segment to the others */ 992 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 993 { 994 /* the fake segments are introduced to hint the metrics -- */ 995 /* we must never link them to anything */ 996 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last ) 997 continue; 998 999 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 1000 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos ) 1001 #endif 1002 { 1003 FT_Pos pos1 = seg1->pos; 1004 FT_Pos pos2 = seg2->pos; 1005 FT_Pos dist = pos2 - pos1; 1006 1007 1008 if ( dist < 0 ) 1009 continue; 1010 1011 { 1012 FT_Pos min = seg1->min_coord; 1013 FT_Pos max = seg1->max_coord; 1014 FT_Pos len, score; 1015 1016 1017 if ( min < seg2->min_coord ) 1018 min = seg2->min_coord; 1019 1020 if ( max > seg2->max_coord ) 1021 max = seg2->max_coord; 1022 1023 len = max - min; 1024 if ( len >= len_threshold ) 1025 { 1026 score = dist + len_score / len; 1027 if ( score < seg1->score ) 1028 { 1029 seg1->score = score; 1030 seg1->link = seg2; 1031 } 1032 1033 if ( score < seg2->score ) 1034 { 1035 seg2->score = score; 1036 seg2->link = seg1; 1037 } 1038 } 1039 } 1040 } 1041 } 1042 #if 0 1043 } 1044 #endif 1045 1046 /* now, compute the `serif' segments */ 1047 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1048 { 1049 seg2 = seg1->link; 1050 1051 if ( seg2 ) 1052 { 1053 if ( seg2->link != seg1 ) 1054 { 1055 seg1->link = 0; 1056 seg1->serif = seg2->link; 1057 } 1058 } 1059 } 1060 } 1061 1062 1063 FT_LOCAL_DEF( FT_Error ) af_latin2_hints_compute_edges(AF_GlyphHints hints,AF_Dimension dim)1064 af_latin2_hints_compute_edges( AF_GlyphHints hints, 1065 AF_Dimension dim ) 1066 { 1067 AF_AxisHints axis = &hints->axis[dim]; 1068 FT_Error error = FT_Err_Ok; 1069 FT_Memory memory = hints->memory; 1070 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim]; 1071 1072 AF_Segment segments = axis->segments; 1073 AF_Segment segment_limit = segments + axis->num_segments; 1074 AF_Segment seg; 1075 1076 AF_Direction up_dir; 1077 FT_Fixed scale; 1078 FT_Pos edge_distance_threshold; 1079 FT_Pos segment_length_threshold; 1080 1081 1082 axis->num_edges = 0; 1083 1084 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 1085 : hints->y_scale; 1086 1087 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP 1088 : AF_DIR_RIGHT; 1089 1090 /* 1091 * We want to ignore very small (mostly serif) segments, we do that 1092 * by ignoring those that whose length is less than a given fraction 1093 * of the standard width. If there is no standard width, we ignore 1094 * those that are less than a given size in pixels 1095 * 1096 * also, unlink serif segments that are linked to segments farther 1097 * than 50% of the standard width 1098 */ 1099 if ( dim == AF_DIMENSION_HORZ ) 1100 { 1101 if ( laxis->width_count > 0 ) 1102 segment_length_threshold = ( laxis->standard_width * 10 ) >> 4; 1103 else 1104 segment_length_threshold = FT_DivFix( 64, hints->y_scale ); 1105 } 1106 else 1107 segment_length_threshold = 0; 1108 1109 /*********************************************************************/ 1110 /* */ 1111 /* We will begin by generating a sorted table of edges for the */ 1112 /* current direction. To do so, we simply scan each segment and try */ 1113 /* to find an edge in our table that corresponds to its position. */ 1114 /* */ 1115 /* If no edge is found, we create and insert a new edge in the */ 1116 /* sorted table. Otherwise, we simply add the segment to the edge's */ 1117 /* list which will be processed in the second step to compute the */ 1118 /* edge's properties. */ 1119 /* */ 1120 /* Note that the edges table is sorted along the segment/edge */ 1121 /* position. */ 1122 /* */ 1123 /*********************************************************************/ 1124 1125 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1126 scale ); 1127 if ( edge_distance_threshold > 64 / 4 ) 1128 edge_distance_threshold = 64 / 4; 1129 1130 edge_distance_threshold = FT_DivFix( edge_distance_threshold, 1131 scale ); 1132 1133 for ( seg = segments; seg < segment_limit; seg++ ) 1134 { 1135 AF_Edge found = 0; 1136 FT_Int ee; 1137 1138 1139 if ( seg->height < segment_length_threshold ) 1140 continue; 1141 1142 /* A special case for serif edges: If they are smaller than */ 1143 /* 1.5 pixels we ignore them. */ 1144 if ( seg->serif ) 1145 { 1146 FT_Pos dist = seg->serif->pos - seg->pos; 1147 1148 1149 if ( dist < 0 ) 1150 dist = -dist; 1151 1152 if ( dist >= laxis->standard_width >> 1 ) 1153 { 1154 /* unlink this serif, it is too distant from its reference stem */ 1155 seg->serif = NULL; 1156 } 1157 else if ( 2*seg->height < 3 * segment_length_threshold ) 1158 continue; 1159 } 1160 1161 /* look for an edge corresponding to the segment */ 1162 for ( ee = 0; ee < axis->num_edges; ee++ ) 1163 { 1164 AF_Edge edge = axis->edges + ee; 1165 FT_Pos dist; 1166 1167 1168 dist = seg->pos - edge->fpos; 1169 if ( dist < 0 ) 1170 dist = -dist; 1171 1172 if ( dist < edge_distance_threshold && edge->dir == seg->dir ) 1173 { 1174 found = edge; 1175 break; 1176 } 1177 } 1178 1179 if ( !found ) 1180 { 1181 AF_Edge edge; 1182 1183 1184 /* insert a new edge in the list and */ 1185 /* sort according to the position */ 1186 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, 1187 memory, &edge ); 1188 if ( error ) 1189 goto Exit; 1190 1191 /* add the segment to the new edge's list */ 1192 FT_ZERO( edge ); 1193 1194 edge->first = seg; 1195 edge->last = seg; 1196 edge->fpos = seg->pos; 1197 edge->dir = seg->dir; 1198 edge->opos = edge->pos = FT_MulFix( seg->pos, scale ); 1199 seg->edge_next = seg; 1200 } 1201 else 1202 { 1203 /* if an edge was found, simply add the segment to the edge's */ 1204 /* list */ 1205 seg->edge_next = found->first; 1206 found->last->edge_next = seg; 1207 found->last = seg; 1208 } 1209 } 1210 1211 1212 /*********************************************************************/ 1213 /* */ 1214 /* Good, we will now compute each edge's properties according to */ 1215 /* segments found on its position. Basically, these are: */ 1216 /* */ 1217 /* - edge's main direction */ 1218 /* - stem edge, serif edge or both (which defaults to stem then) */ 1219 /* - rounded edge, straight or both (which defaults to straight) */ 1220 /* - link for edge */ 1221 /* */ 1222 /*********************************************************************/ 1223 1224 /* first of all, set the `edge' field in each segment -- this is */ 1225 /* required in order to compute edge links */ 1226 1227 /* 1228 * Note that removing this loop and setting the `edge' field of each 1229 * segment directly in the code above slows down execution speed for 1230 * some reasons on platforms like the Sun. 1231 */ 1232 { 1233 AF_Edge edges = axis->edges; 1234 AF_Edge edge_limit = edges + axis->num_edges; 1235 AF_Edge edge; 1236 1237 1238 for ( edge = edges; edge < edge_limit; edge++ ) 1239 { 1240 seg = edge->first; 1241 if ( seg ) 1242 do 1243 { 1244 seg->edge = edge; 1245 seg = seg->edge_next; 1246 1247 } while ( seg != edge->first ); 1248 } 1249 1250 /* now, compute each edge properties */ 1251 for ( edge = edges; edge < edge_limit; edge++ ) 1252 { 1253 FT_Int is_round = 0; /* does it contain round segments? */ 1254 FT_Int is_straight = 0; /* does it contain straight segments? */ 1255 #if 0 1256 FT_Pos ups = 0; /* number of upwards segments */ 1257 FT_Pos downs = 0; /* number of downwards segments */ 1258 #endif 1259 1260 1261 seg = edge->first; 1262 1263 do 1264 { 1265 FT_Bool is_serif; 1266 1267 1268 /* check for roundness of segment */ 1269 if ( seg->flags & AF_EDGE_ROUND ) 1270 is_round++; 1271 else 1272 is_straight++; 1273 1274 #if 0 1275 /* check for segment direction */ 1276 if ( seg->dir == up_dir ) 1277 ups += seg->max_coord-seg->min_coord; 1278 else 1279 downs += seg->max_coord-seg->min_coord; 1280 #endif 1281 1282 /* check for links -- if seg->serif is set, then seg->link must */ 1283 /* be ignored */ 1284 is_serif = (FT_Bool)( seg->serif && 1285 seg->serif->edge && 1286 seg->serif->edge != edge ); 1287 1288 if ( ( seg->link && seg->link->edge != NULL ) || is_serif ) 1289 { 1290 AF_Edge edge2; 1291 AF_Segment seg2; 1292 1293 1294 edge2 = edge->link; 1295 seg2 = seg->link; 1296 1297 if ( is_serif ) 1298 { 1299 seg2 = seg->serif; 1300 edge2 = edge->serif; 1301 } 1302 1303 if ( edge2 ) 1304 { 1305 FT_Pos edge_delta; 1306 FT_Pos seg_delta; 1307 1308 1309 edge_delta = edge->fpos - edge2->fpos; 1310 if ( edge_delta < 0 ) 1311 edge_delta = -edge_delta; 1312 1313 seg_delta = seg->pos - seg2->pos; 1314 if ( seg_delta < 0 ) 1315 seg_delta = -seg_delta; 1316 1317 if ( seg_delta < edge_delta ) 1318 edge2 = seg2->edge; 1319 } 1320 else 1321 edge2 = seg2->edge; 1322 1323 if ( is_serif ) 1324 { 1325 edge->serif = edge2; 1326 edge2->flags |= AF_EDGE_SERIF; 1327 } 1328 else 1329 edge->link = edge2; 1330 } 1331 1332 seg = seg->edge_next; 1333 1334 } while ( seg != edge->first ); 1335 1336 /* set the round/straight flags */ 1337 edge->flags = AF_EDGE_NORMAL; 1338 1339 if ( is_round > 0 && is_round >= is_straight ) 1340 edge->flags |= AF_EDGE_ROUND; 1341 1342 #if 0 1343 /* set the edge's main direction */ 1344 edge->dir = AF_DIR_NONE; 1345 1346 if ( ups > downs ) 1347 edge->dir = (FT_Char)up_dir; 1348 1349 else if ( ups < downs ) 1350 edge->dir = (FT_Char)-up_dir; 1351 1352 else if ( ups == downs ) 1353 edge->dir = 0; /* both up and down! */ 1354 #endif 1355 1356 /* gets rid of serifs if link is set */ 1357 /* XXX: This gets rid of many unpleasant artefacts! */ 1358 /* Example: the `c' in cour.pfa at size 13 */ 1359 1360 if ( edge->serif && edge->link ) 1361 edge->serif = 0; 1362 } 1363 } 1364 1365 Exit: 1366 return error; 1367 } 1368 1369 1370 FT_LOCAL_DEF( FT_Error ) af_latin2_hints_detect_features(AF_GlyphHints hints,AF_Dimension dim)1371 af_latin2_hints_detect_features( AF_GlyphHints hints, 1372 AF_Dimension dim ) 1373 { 1374 FT_Error error; 1375 1376 1377 error = af_latin2_hints_compute_segments( hints, dim ); 1378 if ( !error ) 1379 { 1380 af_latin2_hints_link_segments( hints, dim ); 1381 1382 error = af_latin2_hints_compute_edges( hints, dim ); 1383 } 1384 return error; 1385 } 1386 1387 1388 FT_LOCAL_DEF( void ) af_latin2_hints_compute_blue_edges(AF_GlyphHints hints,AF_LatinMetrics metrics)1389 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints, 1390 AF_LatinMetrics metrics ) 1391 { 1392 AF_AxisHints axis = &hints->axis[AF_DIMENSION_VERT]; 1393 AF_Edge edge = axis->edges; 1394 AF_Edge edge_limit = edge + axis->num_edges; 1395 AF_LatinAxis latin = &metrics->axis[AF_DIMENSION_VERT]; 1396 FT_Fixed scale = latin->scale; 1397 FT_Pos best_dist0; /* initial threshold */ 1398 1399 1400 /* compute the initial threshold as a fraction of the EM size */ 1401 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1402 1403 if ( best_dist0 > 64 / 2 ) 1404 best_dist0 = 64 / 2; 1405 1406 /* compute which blue zones are active, i.e. have their scaled */ 1407 /* size < 3/4 pixels */ 1408 1409 /* for each horizontal edge search the blue zone which is closest */ 1410 for ( ; edge < edge_limit; edge++ ) 1411 { 1412 FT_Int bb; 1413 AF_Width best_blue = NULL; 1414 FT_Pos best_dist = best_dist0; 1415 1416 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 1417 { 1418 AF_LatinBlue blue = latin->blues + bb; 1419 FT_Bool is_top_blue, is_major_dir; 1420 1421 1422 /* skip inactive blue zones (i.e., those that are too small) */ 1423 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) ) 1424 continue; 1425 1426 /* if it is a top zone, check for right edges -- if it is a bottom */ 1427 /* zone, check for left edges */ 1428 /* */ 1429 /* of course, that's for TrueType */ 1430 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 ); 1431 is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); 1432 1433 /* if it is a top zone, the edge must be against the major */ 1434 /* direction; if it is a bottom zone, it must be in the major */ 1435 /* direction */ 1436 if ( is_top_blue ^ is_major_dir ) 1437 { 1438 FT_Pos dist; 1439 AF_Width compare; 1440 1441 1442 /* if it's a rounded edge, compare it to the overshoot position */ 1443 /* if it's a flat edge, compare it to the reference position */ 1444 if ( edge->flags & AF_EDGE_ROUND ) 1445 compare = &blue->shoot; 1446 else 1447 compare = &blue->ref; 1448 1449 dist = edge->fpos - compare->org; 1450 if ( dist < 0 ) 1451 dist = -dist; 1452 1453 dist = FT_MulFix( dist, scale ); 1454 if ( dist < best_dist ) 1455 { 1456 best_dist = dist; 1457 best_blue = compare; 1458 } 1459 1460 #if 0 1461 /* now, compare it to the overshoot position if the edge is */ 1462 /* rounded, and if the edge is over the reference position of a */ 1463 /* top zone, or under the reference position of a bottom zone */ 1464 if ( edge->flags & AF_EDGE_ROUND && dist != 0 ) 1465 { 1466 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org ); 1467 1468 1469 if ( is_top_blue ^ is_under_ref ) 1470 { 1471 blue = latin->blues + bb; 1472 dist = edge->fpos - blue->shoot.org; 1473 if ( dist < 0 ) 1474 dist = -dist; 1475 1476 dist = FT_MulFix( dist, scale ); 1477 if ( dist < best_dist ) 1478 { 1479 best_dist = dist; 1480 best_blue = & blue->shoot; 1481 } 1482 } 1483 } 1484 #endif 1485 } 1486 } 1487 1488 if ( best_blue ) 1489 edge->blue_edge = best_blue; 1490 } 1491 } 1492 1493 1494 static FT_Error af_latin2_hints_init(AF_GlyphHints hints,AF_LatinMetrics metrics)1495 af_latin2_hints_init( AF_GlyphHints hints, 1496 AF_LatinMetrics metrics ) 1497 { 1498 FT_Render_Mode mode; 1499 FT_UInt32 scaler_flags, other_flags; 1500 FT_Face face = metrics->root.scaler.face; 1501 1502 1503 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics ); 1504 1505 /* 1506 * correct x_scale and y_scale if needed, since they may have 1507 * been modified `af_latin2_metrics_scale_dim' above 1508 */ 1509 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1510 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1511 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1512 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1513 1514 /* compute flags depending on render mode, etc. */ 1515 mode = metrics->root.scaler.render_mode; 1516 1517 #if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */ 1518 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1519 { 1520 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1521 } 1522 #endif 1523 1524 scaler_flags = hints->scaler_flags; 1525 other_flags = 0; 1526 1527 /* 1528 * We snap the width of vertical stems for the monochrome and 1529 * horizontal LCD rendering targets only. 1530 */ 1531 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1532 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1533 1534 /* 1535 * We snap the width of horizontal stems for the monochrome and 1536 * vertical LCD rendering targets only. 1537 */ 1538 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1539 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1540 1541 /* 1542 * We adjust stems to full pixels only if we don't use the `light' mode. 1543 */ 1544 if ( mode != FT_RENDER_MODE_LIGHT ) 1545 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1546 1547 if ( mode == FT_RENDER_MODE_MONO ) 1548 other_flags |= AF_LATIN_HINTS_MONO; 1549 1550 /* 1551 * In `light' hinting mode we disable horizontal hinting completely. 1552 * We also do it if the face is italic. 1553 */ 1554 if ( mode == FT_RENDER_MODE_LIGHT || 1555 ( face->style_flags & FT_STYLE_FLAG_ITALIC ) != 0 ) 1556 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL; 1557 1558 hints->scaler_flags = scaler_flags; 1559 hints->other_flags = other_flags; 1560 1561 return 0; 1562 } 1563 1564 1565 /*************************************************************************/ 1566 /*************************************************************************/ 1567 /***** *****/ 1568 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/ 1569 /***** *****/ 1570 /*************************************************************************/ 1571 /*************************************************************************/ 1572 1573 /* snap a given width in scaled coordinates to one of the */ 1574 /* current standard widths */ 1575 1576 static FT_Pos af_latin2_snap_width(AF_Width widths,FT_Int count,FT_Pos width)1577 af_latin2_snap_width( AF_Width widths, 1578 FT_Int count, 1579 FT_Pos width ) 1580 { 1581 int n; 1582 FT_Pos best = 64 + 32 + 2; 1583 FT_Pos reference = width; 1584 FT_Pos scaled; 1585 1586 1587 for ( n = 0; n < count; n++ ) 1588 { 1589 FT_Pos w; 1590 FT_Pos dist; 1591 1592 1593 w = widths[n].cur; 1594 dist = width - w; 1595 if ( dist < 0 ) 1596 dist = -dist; 1597 if ( dist < best ) 1598 { 1599 best = dist; 1600 reference = w; 1601 } 1602 } 1603 1604 scaled = FT_PIX_ROUND( reference ); 1605 1606 if ( width >= reference ) 1607 { 1608 if ( width < scaled + 48 ) 1609 width = reference; 1610 } 1611 else 1612 { 1613 if ( width > scaled - 48 ) 1614 width = reference; 1615 } 1616 1617 return width; 1618 } 1619 1620 1621 /* compute the snapped width of a given stem */ 1622 1623 static FT_Pos af_latin2_compute_stem_width(AF_GlyphHints hints,AF_Dimension dim,FT_Pos width,AF_Edge_Flags base_flags,AF_Edge_Flags stem_flags)1624 af_latin2_compute_stem_width( AF_GlyphHints hints, 1625 AF_Dimension dim, 1626 FT_Pos width, 1627 AF_Edge_Flags base_flags, 1628 AF_Edge_Flags stem_flags ) 1629 { 1630 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics; 1631 AF_LatinAxis axis = & metrics->axis[dim]; 1632 FT_Pos dist = width; 1633 FT_Int sign = 0; 1634 FT_Int vertical = ( dim == AF_DIMENSION_VERT ); 1635 1636 FT_UNUSED( base_flags ); 1637 1638 1639 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) || 1640 axis->extra_light ) 1641 return width; 1642 1643 if ( dist < 0 ) 1644 { 1645 dist = -width; 1646 sign = 1; 1647 } 1648 1649 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1650 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1651 { 1652 /* smooth hinting process: very lightly quantize the stem width */ 1653 1654 /* leave the widths of serifs alone */ 1655 1656 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) ) 1657 goto Done_Width; 1658 1659 #if 0 1660 else if ( ( base_flags & AF_EDGE_ROUND ) ) 1661 { 1662 if ( dist < 80 ) 1663 dist = 64; 1664 } 1665 else if ( dist < 56 ) 1666 dist = 56; 1667 #endif 1668 if ( axis->width_count > 0 ) 1669 { 1670 FT_Pos delta; 1671 1672 1673 /* compare to standard width */ 1674 if ( axis->width_count > 0 ) 1675 { 1676 delta = dist - axis->widths[0].cur; 1677 1678 if ( delta < 0 ) 1679 delta = -delta; 1680 1681 if ( delta < 40 ) 1682 { 1683 dist = axis->widths[0].cur; 1684 if ( dist < 48 ) 1685 dist = 48; 1686 1687 goto Done_Width; 1688 } 1689 } 1690 1691 if ( dist < 3 * 64 ) 1692 { 1693 delta = dist & 63; 1694 dist &= -64; 1695 1696 if ( delta < 10 ) 1697 dist += delta; 1698 1699 else if ( delta < 32 ) 1700 dist += 10; 1701 1702 else if ( delta < 54 ) 1703 dist += 54; 1704 1705 else 1706 dist += delta; 1707 } 1708 else 1709 dist = ( dist + 32 ) & ~63; 1710 } 1711 } 1712 else 1713 { 1714 /* strong hinting process: snap the stem width to integer pixels */ 1715 FT_Pos org_dist = dist; 1716 1717 1718 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist ); 1719 1720 if ( vertical ) 1721 { 1722 /* in the case of vertical hinting, always round */ 1723 /* the stem heights to integer pixels */ 1724 1725 if ( dist >= 64 ) 1726 dist = ( dist + 16 ) & ~63; 1727 else 1728 dist = 64; 1729 } 1730 else 1731 { 1732 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1733 { 1734 /* monochrome horizontal hinting: snap widths to integer pixels */ 1735 /* with a different threshold */ 1736 1737 if ( dist < 64 ) 1738 dist = 64; 1739 else 1740 dist = ( dist + 32 ) & ~63; 1741 } 1742 else 1743 { 1744 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1745 /* approach: we strengthen small stems, round stems whose size */ 1746 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1747 1748 if ( dist < 48 ) 1749 dist = ( dist + 64 ) >> 1; 1750 1751 else if ( dist < 128 ) 1752 { 1753 /* We only round to an integer width if the corresponding */ 1754 /* distortion is less than 1/4 pixel. Otherwise this */ 1755 /* makes everything worse since the diagonals, which are */ 1756 /* not hinted, appear a lot bolder or thinner than the */ 1757 /* vertical stems. */ 1758 1759 FT_Int delta; 1760 1761 1762 dist = ( dist + 22 ) & ~63; 1763 delta = dist - org_dist; 1764 if ( delta < 0 ) 1765 delta = -delta; 1766 1767 if ( delta >= 16 ) 1768 { 1769 dist = org_dist; 1770 if ( dist < 48 ) 1771 dist = ( dist + 64 ) >> 1; 1772 } 1773 } 1774 else 1775 /* round otherwise to prevent color fringes in LCD mode */ 1776 dist = ( dist + 32 ) & ~63; 1777 } 1778 } 1779 } 1780 1781 Done_Width: 1782 if ( sign ) 1783 dist = -dist; 1784 1785 return dist; 1786 } 1787 1788 1789 /* align one stem edge relative to the previous stem edge */ 1790 1791 static void af_latin2_align_linked_edge(AF_GlyphHints hints,AF_Dimension dim,AF_Edge base_edge,AF_Edge stem_edge)1792 af_latin2_align_linked_edge( AF_GlyphHints hints, 1793 AF_Dimension dim, 1794 AF_Edge base_edge, 1795 AF_Edge stem_edge ) 1796 { 1797 FT_Pos dist = stem_edge->opos - base_edge->opos; 1798 1799 FT_Pos fitted_width = af_latin2_compute_stem_width( 1800 hints, dim, dist, 1801 (AF_Edge_Flags)base_edge->flags, 1802 (AF_Edge_Flags)stem_edge->flags ); 1803 1804 1805 stem_edge->pos = base_edge->pos + fitted_width; 1806 1807 FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), " 1808 "dist was %.2f, now %.2f\n", 1809 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0, 1810 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 )); 1811 } 1812 1813 1814 static void af_latin2_align_serif_edge(AF_GlyphHints hints,AF_Edge base,AF_Edge serif)1815 af_latin2_align_serif_edge( AF_GlyphHints hints, 1816 AF_Edge base, 1817 AF_Edge serif ) 1818 { 1819 FT_UNUSED( hints ); 1820 1821 serif->pos = base->pos + ( serif->opos - base->opos ); 1822 } 1823 1824 1825 /*************************************************************************/ 1826 /*************************************************************************/ 1827 /*************************************************************************/ 1828 /**** ****/ 1829 /**** E D G E H I N T I N G ****/ 1830 /**** ****/ 1831 /*************************************************************************/ 1832 /*************************************************************************/ 1833 /*************************************************************************/ 1834 1835 1836 FT_LOCAL_DEF( void ) af_latin2_hint_edges(AF_GlyphHints hints,AF_Dimension dim)1837 af_latin2_hint_edges( AF_GlyphHints hints, 1838 AF_Dimension dim ) 1839 { 1840 AF_AxisHints axis = &hints->axis[dim]; 1841 AF_Edge edges = axis->edges; 1842 AF_Edge edge_limit = edges + axis->num_edges; 1843 AF_Edge edge; 1844 AF_Edge anchor = 0; 1845 FT_Int has_serifs = 0; 1846 FT_Pos anchor_drift = 0; 1847 1848 1849 1850 FT_TRACE5(( "==== hinting %s edges =====\n", 1851 dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" )); 1852 1853 /* we begin by aligning all stems relative to the blue zone */ 1854 /* if needed -- that's only for horizontal edges */ 1855 1856 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) ) 1857 { 1858 for ( edge = edges; edge < edge_limit; edge++ ) 1859 { 1860 AF_Width blue; 1861 AF_Edge edge1, edge2; 1862 1863 1864 if ( edge->flags & AF_EDGE_DONE ) 1865 continue; 1866 1867 blue = edge->blue_edge; 1868 edge1 = NULL; 1869 edge2 = edge->link; 1870 1871 if ( blue ) 1872 { 1873 edge1 = edge; 1874 } 1875 else if ( edge2 && edge2->blue_edge ) 1876 { 1877 blue = edge2->blue_edge; 1878 edge1 = edge2; 1879 edge2 = edge; 1880 } 1881 1882 if ( !edge1 ) 1883 continue; 1884 1885 FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), " 1886 "was (%.2f)\n", 1887 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0, 1888 edge1->pos / 64.0 )); 1889 1890 edge1->pos = blue->fit; 1891 edge1->flags |= AF_EDGE_DONE; 1892 1893 if ( edge2 && !edge2->blue_edge ) 1894 { 1895 af_latin2_align_linked_edge( hints, dim, edge1, edge2 ); 1896 edge2->flags |= AF_EDGE_DONE; 1897 } 1898 1899 if ( !anchor ) 1900 { 1901 anchor = edge; 1902 1903 anchor_drift = ( anchor->pos - anchor->opos ); 1904 if ( edge2 ) 1905 anchor_drift = ( anchor_drift + 1906 ( edge2->pos - edge2->opos ) ) >> 1; 1907 } 1908 } 1909 } 1910 1911 /* now we will align all stem edges, trying to maintain the */ 1912 /* relative order of stems in the glyph */ 1913 for ( edge = edges; edge < edge_limit; edge++ ) 1914 { 1915 AF_Edge edge2; 1916 1917 1918 if ( edge->flags & AF_EDGE_DONE ) 1919 continue; 1920 1921 /* skip all non-stem edges */ 1922 edge2 = edge->link; 1923 if ( !edge2 ) 1924 { 1925 has_serifs++; 1926 continue; 1927 } 1928 1929 /* now align the stem */ 1930 1931 /* this should not happen, but it's better to be safe */ 1932 if ( edge2->blue_edge ) 1933 { 1934 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1935 1936 af_latin2_align_linked_edge( hints, dim, edge2, edge ); 1937 edge->flags |= AF_EDGE_DONE; 1938 continue; 1939 } 1940 1941 if ( !anchor ) 1942 { 1943 FT_Pos org_len, org_center, cur_len; 1944 FT_Pos cur_pos1, error1, error2, u_off, d_off; 1945 1946 1947 org_len = edge2->opos - edge->opos; 1948 cur_len = af_latin2_compute_stem_width( 1949 hints, dim, org_len, 1950 (AF_Edge_Flags)edge->flags, 1951 (AF_Edge_Flags)edge2->flags ); 1952 if ( cur_len <= 64 ) 1953 u_off = d_off = 32; 1954 else 1955 { 1956 u_off = 38; 1957 d_off = 26; 1958 } 1959 1960 if ( cur_len < 96 ) 1961 { 1962 org_center = edge->opos + ( org_len >> 1 ); 1963 1964 cur_pos1 = FT_PIX_ROUND( org_center ); 1965 1966 error1 = org_center - ( cur_pos1 - u_off ); 1967 if ( error1 < 0 ) 1968 error1 = -error1; 1969 1970 error2 = org_center - ( cur_pos1 + d_off ); 1971 if ( error2 < 0 ) 1972 error2 = -error2; 1973 1974 if ( error1 < error2 ) 1975 cur_pos1 -= u_off; 1976 else 1977 cur_pos1 += d_off; 1978 1979 edge->pos = cur_pos1 - cur_len / 2; 1980 edge2->pos = edge->pos + cur_len; 1981 } 1982 else 1983 edge->pos = FT_PIX_ROUND( edge->opos ); 1984 1985 FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)" 1986 " snapped to (%.2f) (%.2f)\n", 1987 edge-edges, edge->opos / 64.0, 1988 edge2-edges, edge2->opos / 64.0, 1989 edge->pos / 64.0, edge2->pos / 64.0 )); 1990 anchor = edge; 1991 1992 edge->flags |= AF_EDGE_DONE; 1993 1994 af_latin2_align_linked_edge( hints, dim, edge, edge2 ); 1995 1996 edge2->flags |= AF_EDGE_DONE; 1997 1998 anchor_drift = ( ( anchor->pos - anchor->opos ) + 1999 ( edge2->pos - edge2->opos ) ) >> 1; 2000 2001 FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 )); 2002 } 2003 else 2004 { 2005 FT_Pos org_pos, org_len, org_center, cur_center, cur_len; 2006 FT_Pos org_left, org_right; 2007 2008 2009 org_pos = edge->opos + anchor_drift; 2010 org_len = edge2->opos - edge->opos; 2011 org_center = org_pos + ( org_len >> 1 ); 2012 2013 cur_len = af_latin2_compute_stem_width( 2014 hints, dim, org_len, 2015 (AF_Edge_Flags)edge->flags, 2016 (AF_Edge_Flags)edge2->flags ); 2017 2018 org_left = org_pos + ( ( org_len - cur_len ) >> 1 ); 2019 org_right = org_pos + ( ( org_len + cur_len ) >> 1 ); 2020 2021 FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ", 2022 org_left / 64.0, org_right / 64.0 )); 2023 cur_center = org_center; 2024 2025 if ( edge2->flags & AF_EDGE_DONE ) 2026 { 2027 FT_TRACE5(( "\n" )); 2028 edge->pos = edge2->pos - cur_len; 2029 } 2030 else 2031 { 2032 /* we want to compare several displacement, and choose 2033 * the one that increases fitness while minimizing 2034 * distortion as well 2035 */ 2036 FT_Pos displacements[6], scores[6], org, fit, delta; 2037 FT_UInt count = 0; 2038 2039 /* note: don't even try to fit tiny stems */ 2040 if ( cur_len < 32 ) 2041 { 2042 FT_TRACE5(( "tiny stem\n" )); 2043 goto AlignStem; 2044 } 2045 2046 /* if the span is within a single pixel, don't touch it */ 2047 if ( FT_PIX_FLOOR( org_left ) == FT_PIX_CEIL( org_right ) ) 2048 { 2049 FT_TRACE5(( "single pixel stem\n" )); 2050 goto AlignStem; 2051 } 2052 2053 if ( cur_len <= 96 ) 2054 { 2055 /* we want to avoid the absolute worst case which is 2056 * when the left and right edges of the span each represent 2057 * about 50% of the gray. we'd better want to change this 2058 * to 25/75%, since this is much more pleasant to the eye with 2059 * very acceptable distortion 2060 */ 2061 FT_Pos frac_left = org_left & 63; 2062 FT_Pos frac_right = org_right & 63; 2063 2064 if ( frac_left >= 22 && frac_left <= 42 && 2065 frac_right >= 22 && frac_right <= 42 ) 2066 { 2067 org = frac_left; 2068 fit = ( org <= 32 ) ? 16 : 48; 2069 delta = FT_ABS( fit - org ); 2070 displacements[count] = fit - org; 2071 scores[count++] = delta; 2072 FT_TRACE5(( "dispA=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2073 2074 org = frac_right; 2075 fit = ( org <= 32 ) ? 16 : 48; 2076 delta = FT_ABS( fit - org ); 2077 displacements[count] = fit - org; 2078 scores[count++] = delta; 2079 FT_TRACE5(( "dispB=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2080 } 2081 } 2082 2083 /* snapping the left edge to the grid */ 2084 org = org_left; 2085 fit = FT_PIX_ROUND( org ); 2086 delta = FT_ABS( fit - org ); 2087 displacements[count] = fit - org; 2088 scores[count++] = delta; 2089 FT_TRACE5(( "dispC=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2090 2091 /* snapping the right edge to the grid */ 2092 org = org_right; 2093 fit = FT_PIX_ROUND( org ); 2094 delta = FT_ABS( fit - org ); 2095 displacements[count] = fit - org; 2096 scores[count++] = delta; 2097 FT_TRACE5(( "dispD=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2098 2099 /* now find the best displacement */ 2100 { 2101 FT_Pos best_score = scores[0]; 2102 FT_Pos best_disp = displacements[0]; 2103 FT_UInt nn; 2104 2105 for ( nn = 1; nn < count; nn++ ) 2106 { 2107 if ( scores[nn] < best_score ) 2108 { 2109 best_score = scores[nn]; 2110 best_disp = displacements[nn]; 2111 } 2112 } 2113 2114 cur_center = org_center + best_disp; 2115 } 2116 FT_TRACE5(( "\n" )); 2117 } 2118 2119 AlignStem: 2120 edge->pos = cur_center - ( cur_len >> 1 ); 2121 edge2->pos = edge->pos + cur_len; 2122 2123 FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)" 2124 " snapped to (%.2f) and (%.2f)," 2125 " org_len=%.2f cur_len=%.2f\n", 2126 edge-edges, edge->opos / 64.0, 2127 edge2-edges, edge2->opos / 64.0, 2128 edge->pos / 64.0, edge2->pos / 64.0, 2129 org_len / 64.0, cur_len / 64.0 )); 2130 2131 edge->flags |= AF_EDGE_DONE; 2132 edge2->flags |= AF_EDGE_DONE; 2133 2134 if ( edge > edges && edge->pos < edge[-1].pos ) 2135 { 2136 FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n", 2137 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 )); 2138 edge->pos = edge[-1].pos; 2139 } 2140 } 2141 } 2142 2143 /* make sure that lowercase m's maintain their symmetry */ 2144 2145 /* In general, lowercase m's have six vertical edges if they are sans */ 2146 /* serif, or twelve if they are with serifs. This implementation is */ 2147 /* based on that assumption, and seems to work very well with most */ 2148 /* faces. However, if for a certain face this assumption is not */ 2149 /* true, the m is just rendered like before. In addition, any stem */ 2150 /* correction will only be applied to symmetrical glyphs (even if the */ 2151 /* glyph is not an m), so the potential for unwanted distortion is */ 2152 /* relatively low. */ 2153 2154 /* We don't handle horizontal edges since we can't easily assure that */ 2155 /* the third (lowest) stem aligns with the base line; it might end up */ 2156 /* one pixel higher or lower. */ 2157 2158 #if 0 2159 { 2160 FT_Int n_edges = edge_limit - edges; 2161 2162 2163 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 2164 { 2165 AF_Edge edge1, edge2, edge3; 2166 FT_Pos dist1, dist2, span, delta; 2167 2168 2169 if ( n_edges == 6 ) 2170 { 2171 edge1 = edges; 2172 edge2 = edges + 2; 2173 edge3 = edges + 4; 2174 } 2175 else 2176 { 2177 edge1 = edges + 1; 2178 edge2 = edges + 5; 2179 edge3 = edges + 9; 2180 } 2181 2182 dist1 = edge2->opos - edge1->opos; 2183 dist2 = edge3->opos - edge2->opos; 2184 2185 span = dist1 - dist2; 2186 if ( span < 0 ) 2187 span = -span; 2188 2189 if ( span < 8 ) 2190 { 2191 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2192 edge3->pos -= delta; 2193 if ( edge3->link ) 2194 edge3->link->pos -= delta; 2195 2196 /* move the serifs along with the stem */ 2197 if ( n_edges == 12 ) 2198 { 2199 ( edges + 8 )->pos -= delta; 2200 ( edges + 11 )->pos -= delta; 2201 } 2202 2203 edge3->flags |= AF_EDGE_DONE; 2204 if ( edge3->link ) 2205 edge3->link->flags |= AF_EDGE_DONE; 2206 } 2207 } 2208 } 2209 #endif 2210 2211 if ( has_serifs || !anchor ) 2212 { 2213 /* 2214 * now hint the remaining edges (serifs and single) in order 2215 * to complete our processing 2216 */ 2217 for ( edge = edges; edge < edge_limit; edge++ ) 2218 { 2219 FT_Pos delta; 2220 2221 2222 if ( edge->flags & AF_EDGE_DONE ) 2223 continue; 2224 2225 delta = 1000; 2226 2227 if ( edge->serif ) 2228 { 2229 delta = edge->serif->opos - edge->opos; 2230 if ( delta < 0 ) 2231 delta = -delta; 2232 } 2233 2234 if ( delta < 64 + 16 ) 2235 { 2236 af_latin2_align_serif_edge( hints, edge->serif, edge ); 2237 FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)" 2238 " aligned to (%.2f)\n", 2239 edge-edges, edge->opos / 64.0, 2240 edge->serif - edges, edge->serif->opos / 64.0, 2241 edge->pos / 64.0 )); 2242 } 2243 else if ( !anchor ) 2244 { 2245 FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)" 2246 " snapped to (%.2f)\n", 2247 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2248 edge->pos = FT_PIX_ROUND( edge->opos ); 2249 anchor = edge; 2250 } 2251 else 2252 { 2253 AF_Edge before, after; 2254 2255 2256 for ( before = edge - 1; before >= edges; before-- ) 2257 if ( before->flags & AF_EDGE_DONE ) 2258 break; 2259 2260 for ( after = edge + 1; after < edge_limit; after++ ) 2261 if ( after->flags & AF_EDGE_DONE ) 2262 break; 2263 2264 if ( before >= edges && before < edge && 2265 after < edge_limit && after > edge ) 2266 { 2267 if ( after->opos == before->opos ) 2268 edge->pos = before->pos; 2269 else 2270 edge->pos = before->pos + 2271 FT_MulDiv( edge->opos - before->opos, 2272 after->pos - before->pos, 2273 after->opos - before->opos ); 2274 FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)" 2275 " from %d (opos=%.2f)\n", 2276 edge-edges, edge->opos / 64.0, edge->pos / 64.0, 2277 before - edges, before->opos / 64.0 )); 2278 } 2279 else 2280 { 2281 edge->pos = anchor->pos + 2282 ( ( edge->opos - anchor->opos + 16 ) & ~31 ); 2283 2284 FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)" 2285 " snapped to (%.2f)\n", 2286 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2287 } 2288 } 2289 2290 edge->flags |= AF_EDGE_DONE; 2291 2292 if ( edge > edges && edge->pos < edge[-1].pos ) 2293 edge->pos = edge[-1].pos; 2294 2295 if ( edge + 1 < edge_limit && 2296 edge[1].flags & AF_EDGE_DONE && 2297 edge->pos > edge[1].pos ) 2298 edge->pos = edge[1].pos; 2299 } 2300 } 2301 } 2302 2303 2304 static FT_Error af_latin2_hints_apply(AF_GlyphHints hints,FT_Outline * outline,AF_LatinMetrics metrics)2305 af_latin2_hints_apply( AF_GlyphHints hints, 2306 FT_Outline* outline, 2307 AF_LatinMetrics metrics ) 2308 { 2309 FT_Error error; 2310 int dim; 2311 2312 2313 error = af_glyph_hints_reload( hints, outline ); 2314 if ( error ) 2315 goto Exit; 2316 2317 /* analyze glyph outline */ 2318 #ifdef AF_CONFIG_OPTION_USE_WARPER 2319 if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT || 2320 AF_HINTS_DO_HORIZONTAL( hints ) ) 2321 #else 2322 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2323 #endif 2324 { 2325 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2326 if ( error ) 2327 goto Exit; 2328 } 2329 2330 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2331 { 2332 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT ); 2333 if ( error ) 2334 goto Exit; 2335 2336 af_latin2_hints_compute_blue_edges( hints, metrics ); 2337 } 2338 2339 /* grid-fit the outline */ 2340 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2341 { 2342 #ifdef AF_CONFIG_OPTION_USE_WARPER 2343 if ( ( dim == AF_DIMENSION_HORZ && 2344 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) ) 2345 { 2346 AF_WarperRec warper; 2347 FT_Fixed scale; 2348 FT_Pos delta; 2349 2350 2351 af_warper_compute( &warper, hints, dim, &scale, &delta ); 2352 af_glyph_hints_scale_dim( hints, dim, scale, delta ); 2353 continue; 2354 } 2355 #endif 2356 2357 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2358 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2359 { 2360 af_latin2_hint_edges( hints, (AF_Dimension)dim ); 2361 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim ); 2362 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2363 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2364 } 2365 } 2366 af_glyph_hints_save( hints, outline ); 2367 2368 Exit: 2369 return error; 2370 } 2371 2372 2373 /*************************************************************************/ 2374 /*************************************************************************/ 2375 /***** *****/ 2376 /***** L A T I N S C R I P T C L A S S *****/ 2377 /***** *****/ 2378 /*************************************************************************/ 2379 /*************************************************************************/ 2380 2381 2382 static const AF_Script_UniRangeRec af_latin2_uniranges[] = 2383 { 2384 AF_UNIRANGE_REC( 32UL, 127UL ), /* TODO: Add new Unicode ranges here! */ 2385 AF_UNIRANGE_REC( 160UL, 255UL ), 2386 AF_UNIRANGE_REC( 0UL, 0UL ) 2387 }; 2388 2389 2390 AF_DEFINE_SCRIPT_CLASS( af_latin2_script_class, 2391 AF_SCRIPT_LATIN2, 2392 af_latin2_uniranges, 2393 'o', 2394 2395 sizeof ( AF_LatinMetricsRec ), 2396 2397 (AF_Script_InitMetricsFunc) af_latin2_metrics_init, 2398 (AF_Script_ScaleMetricsFunc)af_latin2_metrics_scale, 2399 (AF_Script_DoneMetricsFunc) NULL, 2400 2401 (AF_Script_InitHintsFunc) af_latin2_hints_init, 2402 (AF_Script_ApplyHintsFunc) af_latin2_hints_apply 2403 ) 2404 2405 2406 /* END */ 2407