1 /* ATTENTION: This file doesn't compile. It is only here as a reference */ 2 /* of an alternative latin hinting algorithm that was always */ 3 /* marked as experimental. */ 4 5 6 /**************************************************************************** 7 * 8 * aflatin2.c 9 * 10 * Auto-fitter hinting routines for latin writing system (body). 11 * 12 * Copyright (C) 2003-2019 by 13 * David Turner, Robert Wilhelm, and Werner Lemberg. 14 * 15 * This file is part of the FreeType project, and may only be used, 16 * modified, and distributed under the terms of the FreeType project 17 * license, LICENSE.TXT. By continuing to use, modify, or distribute 18 * this file you indicate that you have read the license and 19 * understand and accept it fully. 20 * 21 */ 22 23 24 #include FT_ADVANCES_H 25 26 27 #ifdef FT_OPTION_AUTOFIT2 28 29 #include "afglobal.h" 30 #include "aflatin.h" 31 #include "aflatin2.h" 32 #include "aferrors.h" 33 34 35 #ifdef AF_CONFIG_OPTION_USE_WARPER 36 #include "afwarp.h" 37 #endif 38 39 40 /************************************************************************** 41 * 42 * The macro FT_COMPONENT is used in trace mode. It is an implicit 43 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log 44 * messages during execution. 45 */ 46 #undef FT_COMPONENT 47 #define FT_COMPONENT aflatin2 48 49 50 FT_LOCAL_DEF( FT_Error ) 51 af_latin2_hints_compute_segments( AF_GlyphHints hints, 52 AF_Dimension dim ); 53 54 FT_LOCAL_DEF( void ) 55 af_latin2_hints_link_segments( AF_GlyphHints hints, 56 AF_Dimension dim ); 57 58 /*************************************************************************/ 59 /*************************************************************************/ 60 /***** *****/ 61 /***** L A T I N G L O B A L M E T R I C S *****/ 62 /***** *****/ 63 /*************************************************************************/ 64 /*************************************************************************/ 65 66 FT_LOCAL_DEF( void ) af_latin2_metrics_init_widths(AF_LatinMetrics metrics,FT_Face face)67 af_latin2_metrics_init_widths( AF_LatinMetrics metrics, 68 FT_Face face ) 69 { 70 /* scan the array of segments in each direction */ 71 AF_GlyphHintsRec hints[1]; 72 73 74 af_glyph_hints_init( hints, face->memory ); 75 76 metrics->axis[AF_DIMENSION_HORZ].width_count = 0; 77 metrics->axis[AF_DIMENSION_VERT].width_count = 0; 78 79 { 80 FT_Error error; 81 FT_UInt glyph_index; 82 int dim; 83 AF_LatinMetricsRec dummy[1]; 84 AF_Scaler scaler = &dummy->root.scaler; 85 86 87 glyph_index = FT_Get_Char_Index( 88 face, 89 metrics->root.style_class->standard_char ); 90 if ( glyph_index == 0 ) 91 goto Exit; 92 93 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 94 if ( error || face->glyph->outline.n_points <= 0 ) 95 goto Exit; 96 97 FT_ZERO( dummy ); 98 99 dummy->units_per_em = metrics->units_per_em; 100 scaler->x_scale = scaler->y_scale = 0x10000L; 101 scaler->x_delta = scaler->y_delta = 0; 102 scaler->face = face; 103 scaler->render_mode = FT_RENDER_MODE_NORMAL; 104 scaler->flags = 0; 105 106 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy ); 107 108 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 109 if ( error ) 110 goto Exit; 111 112 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 113 { 114 AF_LatinAxis axis = &metrics->axis[dim]; 115 AF_AxisHints axhints = &hints->axis[dim]; 116 AF_Segment seg, limit, link; 117 FT_UInt num_widths = 0; 118 119 120 error = af_latin2_hints_compute_segments( hints, 121 (AF_Dimension)dim ); 122 if ( error ) 123 goto Exit; 124 125 af_latin2_hints_link_segments( hints, 126 (AF_Dimension)dim ); 127 128 seg = axhints->segments; 129 limit = seg + axhints->num_segments; 130 131 for ( ; seg < limit; seg++ ) 132 { 133 link = seg->link; 134 135 /* we only consider stem segments there! */ 136 if ( link && link->link == seg && link > seg ) 137 { 138 FT_Pos dist; 139 140 141 dist = seg->pos - link->pos; 142 if ( dist < 0 ) 143 dist = -dist; 144 145 if ( num_widths < AF_LATIN_MAX_WIDTHS ) 146 axis->widths[num_widths++].org = dist; 147 } 148 } 149 150 af_sort_widths( num_widths, axis->widths ); 151 axis->width_count = num_widths; 152 } 153 154 Exit: 155 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 156 { 157 AF_LatinAxis axis = &metrics->axis[dim]; 158 FT_Pos stdw; 159 160 161 stdw = ( axis->width_count > 0 ) 162 ? axis->widths[0].org 163 : AF_LATIN_CONSTANT( metrics, 50 ); 164 165 /* let's try 20% of the smallest width */ 166 axis->edge_distance_threshold = stdw / 5; 167 axis->standard_width = stdw; 168 axis->extra_light = 0; 169 } 170 } 171 172 af_glyph_hints_done( hints ); 173 } 174 175 176 177 #define AF_LATIN_MAX_TEST_CHARACTERS 12 178 179 180 static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES] 181 [AF_LATIN_MAX_TEST_CHARACTERS+1] = 182 { 183 "THEZOCQS", 184 "HEZLOCUS", 185 "fijkdbh", 186 "xzroesc", 187 "xzroesc", 188 "pqgjy" 189 }; 190 191 192 static void af_latin2_metrics_init_blues(AF_LatinMetrics metrics,FT_Face face)193 af_latin2_metrics_init_blues( AF_LatinMetrics metrics, 194 FT_Face face ) 195 { 196 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS]; 197 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS]; 198 FT_Int num_flats; 199 FT_Int num_rounds; 200 FT_Int bb; 201 AF_LatinBlue blue; 202 FT_Error error; 203 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT]; 204 FT_GlyphSlot glyph = face->glyph; 205 206 207 /* we compute the blues simply by loading each character from the */ 208 /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */ 209 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */ 210 211 FT_TRACE5(( "blue zones computation\n" 212 "======================\n\n" )); 213 214 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 215 { 216 const char* p = af_latin2_blue_chars[bb]; 217 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS; 218 FT_Pos* blue_ref; 219 FT_Pos* blue_shoot; 220 221 222 FT_TRACE5(( "blue zone %d:\n", bb )); 223 224 num_flats = 0; 225 num_rounds = 0; 226 227 for ( ; p < limit && *p; p++ ) 228 { 229 FT_UInt glyph_index; 230 FT_Int best_point, best_y, best_first, best_last; 231 FT_Vector* points; 232 FT_Bool round; 233 234 235 /* load the character in the face -- skip unknown or empty ones */ 236 glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p ); 237 if ( glyph_index == 0 ) 238 continue; 239 240 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 241 if ( error || glyph->outline.n_points <= 0 ) 242 continue; 243 244 /* now compute min or max point indices and coordinates */ 245 points = glyph->outline.points; 246 best_point = -1; 247 best_y = 0; /* make compiler happy */ 248 best_first = 0; /* ditto */ 249 best_last = 0; /* ditto */ 250 251 { 252 FT_Int nn; 253 FT_Int first = 0; 254 FT_Int last = -1; 255 256 257 for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ ) 258 { 259 FT_Int old_best_point = best_point; 260 FT_Int pp; 261 262 263 last = glyph->outline.contours[nn]; 264 265 /* Avoid single-point contours since they are never rasterized. */ 266 /* In some fonts, they correspond to mark attachment points */ 267 /* which are way outside of the glyph's real outline. */ 268 if ( last <= first ) 269 continue; 270 271 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 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 else 281 { 282 for ( pp = first; pp <= last; pp++ ) 283 if ( best_point < 0 || points[pp].y < best_y ) 284 { 285 best_point = pp; 286 best_y = points[pp].y; 287 } 288 } 289 290 if ( best_point != old_best_point ) 291 { 292 best_first = first; 293 best_last = last; 294 } 295 } 296 FT_TRACE5(( " %c %d", *p, best_y )); 297 } 298 299 /* now check whether the point belongs to a straight or round */ 300 /* segment; we first need to find in which contour the extremum */ 301 /* lies, then inspect its previous and next points */ 302 if ( best_point >= 0 ) 303 { 304 FT_Pos best_x = points[best_point].x; 305 FT_Int start, end, prev, next; 306 FT_Pos dist; 307 308 309 /* now look for the previous and next points that are not on the */ 310 /* same Y coordinate. Threshold the `closeness'... */ 311 start = end = best_point; 312 313 do 314 { 315 prev = start - 1; 316 if ( prev < best_first ) 317 prev = best_last; 318 319 dist = FT_ABS( points[prev].y - best_y ); 320 /* accept a small distance or a small angle (both values are */ 321 /* heuristic; value 20 corresponds to approx. 2.9 degrees) */ 322 if ( dist > 5 ) 323 if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist ) 324 break; 325 326 start = prev; 327 328 } while ( start != best_point ); 329 330 do 331 { 332 next = end + 1; 333 if ( next > best_last ) 334 next = best_first; 335 336 dist = FT_ABS( points[next].y - best_y ); 337 if ( dist > 5 ) 338 if ( FT_ABS( points[next].x - best_x ) <= 20 * dist ) 339 break; 340 341 end = next; 342 343 } while ( end != best_point ); 344 345 /* now, set the `round' flag depending on the segment's kind */ 346 round = FT_BOOL( 347 FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON || 348 FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON ); 349 350 FT_TRACE5(( " (%s)\n", round ? "round" : "flat" )); 351 } 352 353 if ( round ) 354 rounds[num_rounds++] = best_y; 355 else 356 flats[num_flats++] = best_y; 357 } 358 359 if ( num_flats == 0 && num_rounds == 0 ) 360 { 361 /* 362 * we couldn't find a single glyph to compute this blue zone, 363 * we will simply ignore it then 364 */ 365 FT_TRACE5(( " empty\n" )); 366 continue; 367 } 368 369 /* we have computed the contents of the `rounds' and `flats' tables, */ 370 /* now determine the reference and overshoot position of the blue -- */ 371 /* we simply take the median value after a simple sort */ 372 af_sort_pos( num_rounds, rounds ); 373 af_sort_pos( num_flats, flats ); 374 375 blue = & axis->blues[axis->blue_count]; 376 blue_ref = & blue->ref.org; 377 blue_shoot = & blue->shoot.org; 378 379 axis->blue_count++; 380 381 if ( num_flats == 0 ) 382 { 383 *blue_ref = 384 *blue_shoot = rounds[num_rounds / 2]; 385 } 386 else if ( num_rounds == 0 ) 387 { 388 *blue_ref = 389 *blue_shoot = flats[num_flats / 2]; 390 } 391 else 392 { 393 *blue_ref = flats[num_flats / 2]; 394 *blue_shoot = rounds[num_rounds / 2]; 395 } 396 397 /* there are sometimes problems: if the overshoot position of top */ 398 /* zones is under its reference position, or the opposite for bottom */ 399 /* zones. We must thus check everything there and correct the errors */ 400 if ( *blue_shoot != *blue_ref ) 401 { 402 FT_Pos ref = *blue_ref; 403 FT_Pos shoot = *blue_shoot; 404 FT_Bool over_ref = FT_BOOL( shoot > ref ); 405 406 407 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref ) 408 { 409 *blue_ref = 410 *blue_shoot = ( shoot + ref ) / 2; 411 412 FT_TRACE5(( " [overshoot smaller than reference," 413 " taking mean value]\n" )); 414 } 415 } 416 417 blue->flags = 0; 418 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 419 blue->flags |= AF_LATIN_BLUE_TOP; 420 421 /* 422 * The following flag is used later to adjust the y and x scales 423 * in order to optimize the pixel grid alignment of the top of small 424 * letters. 425 */ 426 if ( AF_LATIN_IS_X_HEIGHT_BLUE( bb ) ) 427 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT; 428 429 FT_TRACE5(( " -> reference = %ld\n" 430 " overshoot = %ld\n", 431 *blue_ref, *blue_shoot )); 432 } 433 434 return; 435 } 436 437 438 FT_LOCAL_DEF( void ) af_latin2_metrics_check_digits(AF_LatinMetrics metrics,FT_Face face)439 af_latin2_metrics_check_digits( AF_LatinMetrics metrics, 440 FT_Face face ) 441 { 442 FT_UInt i; 443 FT_Bool started = 0, same_width = 1; 444 FT_Fixed advance, old_advance = 0; 445 446 447 /* check whether all ASCII digits have the same advance width; */ 448 /* digit `0' is 0x30 in all supported charmaps */ 449 for ( i = 0x30; i <= 0x39; i++ ) 450 { 451 FT_UInt glyph_index; 452 453 454 glyph_index = FT_Get_Char_Index( face, i ); 455 if ( glyph_index == 0 ) 456 continue; 457 458 if ( FT_Get_Advance( face, glyph_index, 459 FT_LOAD_NO_SCALE | 460 FT_LOAD_NO_HINTING | 461 FT_LOAD_IGNORE_TRANSFORM, 462 &advance ) ) 463 continue; 464 465 if ( started ) 466 { 467 if ( advance != old_advance ) 468 { 469 same_width = 0; 470 break; 471 } 472 } 473 else 474 { 475 old_advance = advance; 476 started = 1; 477 } 478 } 479 480 metrics->root.digits_have_same_width = same_width; 481 } 482 483 484 FT_LOCAL_DEF( FT_Error ) af_latin2_metrics_init(AF_LatinMetrics metrics,FT_Face face)485 af_latin2_metrics_init( AF_LatinMetrics metrics, 486 FT_Face face ) 487 { 488 FT_Error error = FT_Err_Ok; 489 FT_CharMap oldmap = face->charmap; 490 FT_UInt ee; 491 492 static const FT_Encoding latin_encodings[] = 493 { 494 FT_ENCODING_UNICODE, 495 FT_ENCODING_APPLE_ROMAN, 496 FT_ENCODING_ADOBE_STANDARD, 497 FT_ENCODING_ADOBE_LATIN_1, 498 FT_ENCODING_NONE /* end of list */ 499 }; 500 501 502 metrics->units_per_em = face->units_per_EM; 503 504 /* do we have a latin charmap in there? */ 505 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ ) 506 { 507 error = FT_Select_Charmap( face, latin_encodings[ee] ); 508 if ( !error ) 509 break; 510 } 511 512 if ( !error ) 513 { 514 af_latin2_metrics_init_widths( metrics, face ); 515 af_latin2_metrics_init_blues( metrics, face ); 516 af_latin2_metrics_check_digits( metrics, face ); 517 } 518 519 FT_Set_Charmap( face, oldmap ); 520 return FT_Err_Ok; 521 } 522 523 524 static void af_latin2_metrics_scale_dim(AF_LatinMetrics metrics,AF_Scaler scaler,AF_Dimension dim)525 af_latin2_metrics_scale_dim( AF_LatinMetrics metrics, 526 AF_Scaler scaler, 527 AF_Dimension dim ) 528 { 529 FT_Fixed scale; 530 FT_Pos delta; 531 AF_LatinAxis axis; 532 FT_UInt nn; 533 534 535 if ( dim == AF_DIMENSION_HORZ ) 536 { 537 scale = scaler->x_scale; 538 delta = scaler->x_delta; 539 } 540 else 541 { 542 scale = scaler->y_scale; 543 delta = scaler->y_delta; 544 } 545 546 axis = &metrics->axis[dim]; 547 548 if ( axis->org_scale == scale && axis->org_delta == delta ) 549 return; 550 551 axis->org_scale = scale; 552 axis->org_delta = delta; 553 554 /* 555 * correct Y scale to optimize the alignment of the top of small 556 * letters to the pixel grid 557 */ 558 if ( dim == AF_DIMENSION_VERT ) 559 { 560 AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT]; 561 AF_LatinBlue blue = NULL; 562 563 564 for ( nn = 0; nn < vaxis->blue_count; nn++ ) 565 { 566 if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT ) 567 { 568 blue = &vaxis->blues[nn]; 569 break; 570 } 571 } 572 573 if ( blue ) 574 { 575 FT_Pos scaled; 576 FT_Pos threshold; 577 FT_Pos fitted; 578 FT_UInt limit; 579 FT_UInt ppem; 580 581 582 scaled = FT_MulFix( blue->shoot.org, scaler->y_scale ); 583 ppem = metrics->root.scaler.face->size->metrics.x_ppem; 584 limit = metrics->root.globals->increase_x_height; 585 threshold = 40; 586 587 /* if the `increase-x-height' property is active, */ 588 /* we round up much more often */ 589 if ( limit && 590 ppem <= limit && 591 ppem >= AF_PROP_INCREASE_X_HEIGHT_MIN ) 592 threshold = 52; 593 594 fitted = ( scaled + threshold ) & ~63; 595 596 #if 1 597 if ( scaled != fitted ) 598 { 599 scale = FT_MulDiv( scale, fitted, scaled ); 600 FT_TRACE5(( "== scaled x-top = %.2g" 601 " fitted = %.2g, scaling = %.4g\n", 602 scaled / 64.0, fitted / 64.0, 603 ( fitted * 1.0 ) / scaled )); 604 } 605 #endif 606 } 607 } 608 609 axis->scale = scale; 610 axis->delta = delta; 611 612 if ( dim == AF_DIMENSION_HORZ ) 613 { 614 metrics->root.scaler.x_scale = scale; 615 metrics->root.scaler.x_delta = delta; 616 } 617 else 618 { 619 metrics->root.scaler.y_scale = scale; 620 metrics->root.scaler.y_delta = delta; 621 } 622 623 /* scale the standard widths */ 624 for ( nn = 0; nn < axis->width_count; nn++ ) 625 { 626 AF_Width width = axis->widths + nn; 627 628 629 width->cur = FT_MulFix( width->org, scale ); 630 width->fit = width->cur; 631 } 632 633 /* an extra-light axis corresponds to a standard width that is */ 634 /* smaller than 5/8 pixels */ 635 axis->extra_light = 636 FT_BOOL( FT_MulFix( axis->standard_width, scale ) < 32 + 8 ); 637 638 if ( dim == AF_DIMENSION_VERT ) 639 { 640 /* scale the blue zones */ 641 for ( nn = 0; nn < axis->blue_count; nn++ ) 642 { 643 AF_LatinBlue blue = &axis->blues[nn]; 644 FT_Pos dist; 645 646 647 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 648 blue->ref.fit = blue->ref.cur; 649 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 650 blue->shoot.fit = blue->shoot.cur; 651 blue->flags &= ~AF_LATIN_BLUE_ACTIVE; 652 653 /* a blue zone is only active if it is less than 3/4 pixels tall */ 654 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 655 if ( dist <= 48 && dist >= -48 ) 656 { 657 FT_Pos delta1, delta2; 658 659 delta1 = blue->shoot.org - blue->ref.org; 660 delta2 = delta1; 661 if ( delta1 < 0 ) 662 delta2 = -delta2; 663 664 delta2 = FT_MulFix( delta2, scale ); 665 666 if ( delta2 < 32 ) 667 delta2 = 0; 668 else if ( delta2 < 64 ) 669 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 670 else 671 delta2 = FT_PIX_ROUND( delta2 ); 672 673 if ( delta1 < 0 ) 674 delta2 = -delta2; 675 676 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 677 blue->shoot.fit = blue->ref.fit + delta2; 678 679 FT_TRACE5(( ">> activating blue zone %d:" 680 " ref.cur=%.2g ref.fit=%.2g" 681 " shoot.cur=%.2g shoot.fit=%.2g\n", 682 nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0, 683 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 )); 684 685 blue->flags |= AF_LATIN_BLUE_ACTIVE; 686 } 687 } 688 } 689 } 690 691 692 FT_LOCAL_DEF( void ) af_latin2_metrics_scale(AF_LatinMetrics metrics,AF_Scaler scaler)693 af_latin2_metrics_scale( AF_LatinMetrics metrics, 694 AF_Scaler scaler ) 695 { 696 metrics->root.scaler.render_mode = scaler->render_mode; 697 metrics->root.scaler.face = scaler->face; 698 metrics->root.scaler.flags = scaler->flags; 699 700 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 701 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 702 } 703 704 705 /* Extract standard_width from writing system/script specific */ 706 /* metrics class. */ 707 708 FT_LOCAL_DEF( void ) af_latin2_get_standard_widths(AF_LatinMetrics metrics,FT_Pos * stdHW,FT_Pos * stdVW)709 af_latin2_get_standard_widths( AF_LatinMetrics metrics, 710 FT_Pos* stdHW, 711 FT_Pos* stdVW ) 712 { 713 if ( stdHW ) 714 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width; 715 716 if ( stdVW ) 717 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width; 718 } 719 720 721 /*************************************************************************/ 722 /*************************************************************************/ 723 /***** *****/ 724 /***** L A T I N G L Y P H A N A L Y S I S *****/ 725 /***** *****/ 726 /*************************************************************************/ 727 /*************************************************************************/ 728 729 #define SORT_SEGMENTS 730 731 FT_LOCAL_DEF( FT_Error ) af_latin2_hints_compute_segments(AF_GlyphHints hints,AF_Dimension dim)732 af_latin2_hints_compute_segments( AF_GlyphHints hints, 733 AF_Dimension dim ) 734 { 735 AF_AxisHints axis = &hints->axis[dim]; 736 FT_Memory memory = hints->memory; 737 FT_Error error = FT_Err_Ok; 738 AF_Segment segment = NULL; 739 AF_SegmentRec seg0; 740 AF_Point* contour = hints->contours; 741 AF_Point* contour_limit = contour + hints->num_contours; 742 AF_Direction major_dir, segment_dir; 743 744 745 FT_ZERO( &seg0 ); 746 seg0.score = 32000; 747 seg0.flags = AF_EDGE_NORMAL; 748 749 major_dir = (AF_Direction)FT_ABS( axis->major_dir ); 750 segment_dir = major_dir; 751 752 axis->num_segments = 0; 753 754 /* set up (u,v) in each point */ 755 if ( dim == AF_DIMENSION_HORZ ) 756 { 757 AF_Point point = hints->points; 758 AF_Point limit = point + hints->num_points; 759 760 761 for ( ; point < limit; point++ ) 762 { 763 point->u = point->fx; 764 point->v = point->fy; 765 } 766 } 767 else 768 { 769 AF_Point point = hints->points; 770 AF_Point limit = point + hints->num_points; 771 772 773 for ( ; point < limit; point++ ) 774 { 775 point->u = point->fy; 776 point->v = point->fx; 777 } 778 } 779 780 /* do each contour separately */ 781 for ( ; contour < contour_limit; contour++ ) 782 { 783 AF_Point point = contour[0]; 784 AF_Point start = point; 785 AF_Point last = point->prev; 786 787 788 if ( point == last ) /* skip singletons -- just in case */ 789 continue; 790 791 /* already on an edge ?, backtrack to find its start */ 792 if ( FT_ABS( point->in_dir ) == major_dir ) 793 { 794 point = point->prev; 795 796 while ( point->in_dir == start->in_dir ) 797 point = point->prev; 798 } 799 else /* otherwise, find first segment start, if any */ 800 { 801 while ( FT_ABS( point->out_dir ) != major_dir ) 802 { 803 point = point->next; 804 805 if ( point == start ) 806 goto NextContour; 807 } 808 } 809 810 start = point; 811 812 for (;;) 813 { 814 AF_Point first; 815 FT_Pos min_u, min_v, max_u, max_v; 816 817 /* we're at the start of a new segment */ 818 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir && 819 point->in_dir != point->out_dir ); 820 first = point; 821 822 min_u = max_u = point->u; 823 min_v = max_v = point->v; 824 825 point = point->next; 826 827 while ( point->out_dir == first->out_dir ) 828 { 829 point = point->next; 830 831 if ( point->u < min_u ) 832 min_u = point->u; 833 834 if ( point->u > max_u ) 835 max_u = point->u; 836 } 837 838 if ( point->v < min_v ) 839 min_v = point->v; 840 841 if ( point->v > max_v ) 842 max_v = point->v; 843 844 /* record new segment */ 845 error = af_axis_hints_new_segment( axis, memory, &segment ); 846 if ( error ) 847 goto Exit; 848 849 segment[0] = seg0; 850 segment->dir = first->out_dir; 851 segment->first = first; 852 segment->last = point; 853 segment->pos = (FT_Short)( ( min_u + max_u ) >> 1 ); 854 segment->min_coord = (FT_Short) min_v; 855 segment->max_coord = (FT_Short) max_v; 856 segment->height = (FT_Short)( max_v - min_v ); 857 858 /* a segment is round if it doesn't have successive */ 859 /* on-curve points. */ 860 { 861 AF_Point pt = first; 862 AF_Point last = point; 863 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL; 864 FT_UInt f1; 865 866 867 segment->flags &= ~AF_EDGE_ROUND; 868 869 for ( ; pt != last; f0 = f1 ) 870 { 871 pt = pt->next; 872 f1 = pt->flags & AF_FLAG_CONTROL; 873 874 if ( !f0 && !f1 ) 875 break; 876 877 if ( pt == last ) 878 segment->flags |= AF_EDGE_ROUND; 879 } 880 } 881 882 /* this can happen in the case of a degenerate contour 883 * e.g. a 2-point vertical contour 884 */ 885 if ( point == start ) 886 break; 887 888 /* jump to the start of the next segment, if any */ 889 while ( FT_ABS( point->out_dir ) != major_dir ) 890 { 891 point = point->next; 892 893 if ( point == start ) 894 goto NextContour; 895 } 896 } 897 898 NextContour: 899 ; 900 } /* contours */ 901 902 /* now slightly increase the height of segments when this makes */ 903 /* sense -- this is used to better detect and ignore serifs */ 904 { 905 AF_Segment segments = axis->segments; 906 AF_Segment segments_end = segments + axis->num_segments; 907 908 909 for ( segment = segments; segment < segments_end; segment++ ) 910 { 911 AF_Point first = segment->first; 912 AF_Point last = segment->last; 913 AF_Point p; 914 FT_Pos first_v = first->v; 915 FT_Pos last_v = last->v; 916 917 918 if ( first_v < last_v ) 919 { 920 p = first->prev; 921 if ( p->v < first_v ) 922 segment->height = (FT_Short)( segment->height + 923 ( ( first_v - p->v ) >> 1 ) ); 924 925 p = last->next; 926 if ( p->v > last_v ) 927 segment->height = (FT_Short)( segment->height + 928 ( ( p->v - last_v ) >> 1 ) ); 929 } 930 else 931 { 932 p = first->prev; 933 if ( p->v > first_v ) 934 segment->height = (FT_Short)( segment->height + 935 ( ( p->v - first_v ) >> 1 ) ); 936 937 p = last->next; 938 if ( p->v < last_v ) 939 segment->height = (FT_Short)( segment->height + 940 ( ( last_v - p->v ) >> 1 ) ); 941 } 942 } 943 } 944 945 #ifdef AF_SORT_SEGMENTS 946 /* place all segments with a negative direction to the start 947 * of the array, used to speed up segment linking later... 948 */ 949 { 950 AF_Segment segments = axis->segments; 951 FT_UInt count = axis->num_segments; 952 FT_UInt ii, jj; 953 954 for ( ii = 0; ii < count; ii++ ) 955 { 956 if ( segments[ii].dir > 0 ) 957 { 958 for ( jj = ii + 1; jj < count; jj++ ) 959 { 960 if ( segments[jj].dir < 0 ) 961 { 962 AF_SegmentRec tmp; 963 964 965 tmp = segments[ii]; 966 segments[ii] = segments[jj]; 967 segments[jj] = tmp; 968 969 break; 970 } 971 } 972 973 if ( jj == count ) 974 break; 975 } 976 } 977 axis->mid_segments = ii; 978 } 979 #endif 980 981 Exit: 982 return error; 983 } 984 985 986 FT_LOCAL_DEF( void ) af_latin2_hints_link_segments(AF_GlyphHints hints,AF_Dimension dim)987 af_latin2_hints_link_segments( AF_GlyphHints hints, 988 AF_Dimension dim ) 989 { 990 AF_AxisHints axis = &hints->axis[dim]; 991 AF_Segment segments = axis->segments; 992 AF_Segment segment_limit = segments + axis->num_segments; 993 #ifdef AF_SORT_SEGMENTS 994 AF_Segment segment_mid = segments + axis->mid_segments; 995 #endif 996 FT_Pos len_threshold, len_score; 997 AF_Segment seg1, seg2; 998 999 1000 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 1001 if ( len_threshold == 0 ) 1002 len_threshold = 1; 1003 1004 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 ); 1005 1006 #ifdef AF_SORT_SEGMENTS 1007 for ( seg1 = segments; seg1 < segment_mid; seg1++ ) 1008 { 1009 if ( seg1->dir != axis->major_dir ) 1010 continue; 1011 1012 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ ) 1013 #else 1014 /* now compare each segment to the others */ 1015 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1016 { 1017 if ( seg1->dir != axis->major_dir ) 1018 continue; 1019 1020 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 1021 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos ) 1022 #endif 1023 { 1024 FT_Pos pos1 = seg1->pos; 1025 FT_Pos pos2 = seg2->pos; 1026 FT_Pos dist = pos2 - pos1; 1027 1028 1029 if ( dist < 0 ) 1030 continue; 1031 1032 { 1033 FT_Pos min = seg1->min_coord; 1034 FT_Pos max = seg1->max_coord; 1035 FT_Pos len, score; 1036 1037 1038 if ( min < seg2->min_coord ) 1039 min = seg2->min_coord; 1040 1041 if ( max > seg2->max_coord ) 1042 max = seg2->max_coord; 1043 1044 len = max - min; 1045 if ( len >= len_threshold ) 1046 { 1047 score = dist + len_score / len; 1048 if ( score < seg1->score ) 1049 { 1050 seg1->score = score; 1051 seg1->link = seg2; 1052 } 1053 1054 if ( score < seg2->score ) 1055 { 1056 seg2->score = score; 1057 seg2->link = seg1; 1058 } 1059 } 1060 } 1061 } 1062 } 1063 #if 0 1064 } 1065 #endif 1066 1067 /* now, compute the `serif' segments */ 1068 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1069 { 1070 seg2 = seg1->link; 1071 1072 if ( seg2 ) 1073 { 1074 if ( seg2->link != seg1 ) 1075 { 1076 seg1->link = NULL; 1077 seg1->serif = seg2->link; 1078 } 1079 } 1080 } 1081 } 1082 1083 1084 FT_LOCAL_DEF( FT_Error ) af_latin2_hints_compute_edges(AF_GlyphHints hints,AF_Dimension dim)1085 af_latin2_hints_compute_edges( AF_GlyphHints hints, 1086 AF_Dimension dim ) 1087 { 1088 AF_AxisHints axis = &hints->axis[dim]; 1089 FT_Error error = FT_Err_Ok; 1090 FT_Memory memory = hints->memory; 1091 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim]; 1092 1093 AF_Segment segments = axis->segments; 1094 AF_Segment segment_limit = segments + axis->num_segments; 1095 AF_Segment seg; 1096 1097 AF_Direction up_dir; 1098 FT_Fixed scale; 1099 FT_Pos edge_distance_threshold; 1100 FT_Pos segment_length_threshold; 1101 1102 1103 axis->num_edges = 0; 1104 1105 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 1106 : hints->y_scale; 1107 1108 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP 1109 : AF_DIR_RIGHT; 1110 1111 /* 1112 * We want to ignore very small (mostly serif) segments, we do that 1113 * by ignoring those that whose length is less than a given fraction 1114 * of the standard width. If there is no standard width, we ignore 1115 * those that are less than a given size in pixels 1116 * 1117 * also, unlink serif segments that are linked to segments farther 1118 * than 50% of the standard width 1119 */ 1120 if ( dim == AF_DIMENSION_HORZ ) 1121 { 1122 if ( laxis->width_count > 0 ) 1123 segment_length_threshold = ( laxis->standard_width * 10 ) >> 4; 1124 else 1125 segment_length_threshold = FT_DivFix( 64, hints->y_scale ); 1126 } 1127 else 1128 segment_length_threshold = 0; 1129 1130 /********************************************************************** 1131 * 1132 * We will begin by generating a sorted table of edges for the 1133 * current direction. To do so, we simply scan each segment and try 1134 * to find an edge in our table that corresponds to its position. 1135 * 1136 * If no edge is found, we create and insert a new edge in the 1137 * sorted table. Otherwise, we simply add the segment to the edge's 1138 * list which will be processed in the second step to compute the 1139 * edge's properties. 1140 * 1141 * Note that the edges table is sorted along the segment/edge 1142 * position. 1143 * 1144 */ 1145 1146 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1147 scale ); 1148 if ( edge_distance_threshold > 64 / 4 ) 1149 edge_distance_threshold = 64 / 4; 1150 1151 edge_distance_threshold = FT_DivFix( edge_distance_threshold, 1152 scale ); 1153 1154 for ( seg = segments; seg < segment_limit; seg++ ) 1155 { 1156 AF_Edge found = NULL; 1157 FT_Int ee; 1158 1159 1160 if ( seg->height < segment_length_threshold ) 1161 continue; 1162 1163 /* A special case for serif edges: If they are smaller than */ 1164 /* 1.5 pixels we ignore them. */ 1165 if ( seg->serif ) 1166 { 1167 FT_Pos dist = seg->serif->pos - seg->pos; 1168 1169 1170 if ( dist < 0 ) 1171 dist = -dist; 1172 1173 if ( dist >= laxis->standard_width >> 1 ) 1174 { 1175 /* unlink this serif, it is too distant from its reference stem */ 1176 seg->serif = NULL; 1177 } 1178 else if ( 2*seg->height < 3 * segment_length_threshold ) 1179 continue; 1180 } 1181 1182 /* look for an edge corresponding to the segment */ 1183 for ( ee = 0; ee < axis->num_edges; ee++ ) 1184 { 1185 AF_Edge edge = axis->edges + ee; 1186 FT_Pos dist; 1187 1188 1189 dist = seg->pos - edge->fpos; 1190 if ( dist < 0 ) 1191 dist = -dist; 1192 1193 if ( dist < edge_distance_threshold && edge->dir == seg->dir ) 1194 { 1195 found = edge; 1196 break; 1197 } 1198 } 1199 1200 if ( !found ) 1201 { 1202 AF_Edge edge; 1203 1204 1205 /* insert a new edge in the list and */ 1206 /* sort according to the position */ 1207 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, 0, 1208 memory, &edge ); 1209 if ( error ) 1210 goto Exit; 1211 1212 /* add the segment to the new edge's list */ 1213 FT_ZERO( edge ); 1214 1215 edge->first = seg; 1216 edge->last = seg; 1217 edge->dir = seg->dir; 1218 edge->fpos = seg->pos; 1219 edge->opos = FT_MulFix( seg->pos, scale ); 1220 edge->pos = edge->opos; 1221 seg->edge_next = seg; 1222 } 1223 else 1224 { 1225 /* if an edge was found, simply add the segment to the edge's */ 1226 /* list */ 1227 seg->edge_next = found->first; 1228 found->last->edge_next = seg; 1229 found->last = seg; 1230 } 1231 } 1232 1233 1234 /********************************************************************** 1235 * 1236 * Good, we will now compute each edge's properties according to 1237 * segments found on its position. Basically, these are: 1238 * 1239 * - edge's main direction 1240 * - stem edge, serif edge or both (which defaults to stem then) 1241 * - rounded edge, straight or both (which defaults to straight) 1242 * - link for edge 1243 * 1244 */ 1245 1246 /* first of all, set the `edge' field in each segment -- this is */ 1247 /* required in order to compute edge links */ 1248 1249 /* 1250 * Note that removing this loop and setting the `edge' field of each 1251 * segment directly in the code above slows down execution speed for 1252 * some reasons on platforms like the Sun. 1253 */ 1254 { 1255 AF_Edge edges = axis->edges; 1256 AF_Edge edge_limit = edges + axis->num_edges; 1257 AF_Edge edge; 1258 1259 1260 for ( edge = edges; edge < edge_limit; edge++ ) 1261 { 1262 seg = edge->first; 1263 if ( seg ) 1264 do 1265 { 1266 seg->edge = edge; 1267 seg = seg->edge_next; 1268 1269 } while ( seg != edge->first ); 1270 } 1271 1272 /* now, compute each edge properties */ 1273 for ( edge = edges; edge < edge_limit; edge++ ) 1274 { 1275 FT_Int is_round = 0; /* does it contain round segments? */ 1276 FT_Int is_straight = 0; /* does it contain straight segments? */ 1277 #if 0 1278 FT_Pos ups = 0; /* number of upwards segments */ 1279 FT_Pos downs = 0; /* number of downwards segments */ 1280 #endif 1281 1282 1283 seg = edge->first; 1284 1285 do 1286 { 1287 FT_Bool is_serif; 1288 1289 1290 /* check for roundness of segment */ 1291 if ( seg->flags & AF_EDGE_ROUND ) 1292 is_round++; 1293 else 1294 is_straight++; 1295 1296 #if 0 1297 /* check for segment direction */ 1298 if ( seg->dir == up_dir ) 1299 ups += seg->max_coord-seg->min_coord; 1300 else 1301 downs += seg->max_coord-seg->min_coord; 1302 #endif 1303 1304 /* check for links -- if seg->serif is set, then seg->link must */ 1305 /* be ignored */ 1306 is_serif = FT_BOOL( seg->serif && 1307 seg->serif->edge && 1308 seg->serif->edge != edge ); 1309 1310 if ( ( seg->link && seg->link->edge ) || is_serif ) 1311 { 1312 AF_Edge edge2; 1313 AF_Segment seg2; 1314 1315 1316 edge2 = edge->link; 1317 seg2 = seg->link; 1318 1319 if ( is_serif ) 1320 { 1321 seg2 = seg->serif; 1322 edge2 = edge->serif; 1323 } 1324 1325 if ( edge2 ) 1326 { 1327 FT_Pos edge_delta; 1328 FT_Pos seg_delta; 1329 1330 1331 edge_delta = edge->fpos - edge2->fpos; 1332 if ( edge_delta < 0 ) 1333 edge_delta = -edge_delta; 1334 1335 seg_delta = seg->pos - seg2->pos; 1336 if ( seg_delta < 0 ) 1337 seg_delta = -seg_delta; 1338 1339 if ( seg_delta < edge_delta ) 1340 edge2 = seg2->edge; 1341 } 1342 else 1343 edge2 = seg2->edge; 1344 1345 if ( is_serif ) 1346 { 1347 edge->serif = edge2; 1348 edge2->flags |= AF_EDGE_SERIF; 1349 } 1350 else 1351 edge->link = edge2; 1352 } 1353 1354 seg = seg->edge_next; 1355 1356 } while ( seg != edge->first ); 1357 1358 /* set the round/straight flags */ 1359 edge->flags = AF_EDGE_NORMAL; 1360 1361 if ( is_round > 0 && is_round >= is_straight ) 1362 edge->flags |= AF_EDGE_ROUND; 1363 1364 #if 0 1365 /* set the edge's main direction */ 1366 edge->dir = AF_DIR_NONE; 1367 1368 if ( ups > downs ) 1369 edge->dir = (FT_Char)up_dir; 1370 1371 else if ( ups < downs ) 1372 edge->dir = (FT_Char)-up_dir; 1373 1374 else if ( ups == downs ) 1375 edge->dir = 0; /* both up and down! */ 1376 #endif 1377 1378 /* gets rid of serifs if link is set */ 1379 /* XXX: This gets rid of many unpleasant artefacts! */ 1380 /* Example: the `c' in cour.pfa at size 13 */ 1381 1382 if ( edge->serif && edge->link ) 1383 edge->serif = NULL; 1384 } 1385 } 1386 1387 Exit: 1388 return error; 1389 } 1390 1391 1392 FT_LOCAL_DEF( FT_Error ) af_latin2_hints_detect_features(AF_GlyphHints hints,AF_Dimension dim)1393 af_latin2_hints_detect_features( AF_GlyphHints hints, 1394 AF_Dimension dim ) 1395 { 1396 FT_Error error; 1397 1398 1399 error = af_latin2_hints_compute_segments( hints, dim ); 1400 if ( !error ) 1401 { 1402 af_latin2_hints_link_segments( hints, dim ); 1403 1404 error = af_latin2_hints_compute_edges( hints, dim ); 1405 } 1406 return error; 1407 } 1408 1409 1410 static void af_latin2_hints_compute_blue_edges(AF_GlyphHints hints,AF_LatinMetrics metrics)1411 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints, 1412 AF_LatinMetrics metrics ) 1413 { 1414 AF_AxisHints axis = &hints->axis[AF_DIMENSION_VERT]; 1415 AF_Edge edge = axis->edges; 1416 AF_Edge edge_limit = edge + axis->num_edges; 1417 AF_LatinAxis latin = &metrics->axis[AF_DIMENSION_VERT]; 1418 FT_Fixed scale = latin->scale; 1419 FT_Pos best_dist0; /* initial threshold */ 1420 1421 1422 /* compute the initial threshold as a fraction of the EM size */ 1423 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1424 1425 if ( best_dist0 > 64 / 2 ) 1426 best_dist0 = 64 / 2; 1427 1428 /* compute which blue zones are active, i.e. have their scaled */ 1429 /* size < 3/4 pixels */ 1430 1431 /* for each horizontal edge search the blue zone which is closest */ 1432 for ( ; edge < edge_limit; edge++ ) 1433 { 1434 FT_Int bb; 1435 AF_Width best_blue = NULL; 1436 FT_Pos best_dist = best_dist0; 1437 1438 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 1439 { 1440 AF_LatinBlue blue = latin->blues + bb; 1441 FT_Bool is_top_blue, is_major_dir; 1442 1443 1444 /* skip inactive blue zones (i.e., those that are too small) */ 1445 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) ) 1446 continue; 1447 1448 /* if it is a top zone, check for right edges -- if it is a bottom */ 1449 /* zone, check for left edges */ 1450 /* */ 1451 /* of course, that's for TrueType */ 1452 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 ); 1453 is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); 1454 1455 /* if it is a top zone, the edge must be against the major */ 1456 /* direction; if it is a bottom zone, it must be in the major */ 1457 /* direction */ 1458 if ( is_top_blue ^ is_major_dir ) 1459 { 1460 FT_Pos dist; 1461 AF_Width compare; 1462 1463 1464 /* if it's a rounded edge, compare it to the overshoot position */ 1465 /* if it's a flat edge, compare it to the reference position */ 1466 if ( edge->flags & AF_EDGE_ROUND ) 1467 compare = &blue->shoot; 1468 else 1469 compare = &blue->ref; 1470 1471 dist = edge->fpos - compare->org; 1472 if ( dist < 0 ) 1473 dist = -dist; 1474 1475 dist = FT_MulFix( dist, scale ); 1476 if ( dist < best_dist ) 1477 { 1478 best_dist = dist; 1479 best_blue = compare; 1480 } 1481 1482 #if 0 1483 /* now, compare it to the overshoot position if the edge is */ 1484 /* rounded, and if the edge is over the reference position of a */ 1485 /* top zone, or under the reference position of a bottom zone */ 1486 if ( edge->flags & AF_EDGE_ROUND && dist != 0 ) 1487 { 1488 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org ); 1489 1490 1491 if ( is_top_blue ^ is_under_ref ) 1492 { 1493 blue = latin->blues + bb; 1494 dist = edge->fpos - blue->shoot.org; 1495 if ( dist < 0 ) 1496 dist = -dist; 1497 1498 dist = FT_MulFix( dist, scale ); 1499 if ( dist < best_dist ) 1500 { 1501 best_dist = dist; 1502 best_blue = & blue->shoot; 1503 } 1504 } 1505 } 1506 #endif 1507 } 1508 } 1509 1510 if ( best_blue ) 1511 edge->blue_edge = best_blue; 1512 } 1513 } 1514 1515 1516 static FT_Error af_latin2_hints_init(AF_GlyphHints hints,AF_LatinMetrics metrics)1517 af_latin2_hints_init( AF_GlyphHints hints, 1518 AF_LatinMetrics metrics ) 1519 { 1520 FT_Render_Mode mode; 1521 FT_UInt32 scaler_flags, other_flags; 1522 FT_Face face = metrics->root.scaler.face; 1523 1524 1525 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics ); 1526 1527 /* 1528 * correct x_scale and y_scale if needed, since they may have 1529 * been modified `af_latin2_metrics_scale_dim' above 1530 */ 1531 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1532 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1533 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1534 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1535 1536 /* compute flags depending on render mode, etc. */ 1537 mode = metrics->root.scaler.render_mode; 1538 1539 #if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */ 1540 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1541 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1542 #endif 1543 1544 scaler_flags = hints->scaler_flags; 1545 other_flags = 0; 1546 1547 /* 1548 * We snap the width of vertical stems for the monochrome and 1549 * horizontal LCD rendering targets only. 1550 */ 1551 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1552 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1553 1554 /* 1555 * We snap the width of horizontal stems for the monochrome and 1556 * vertical LCD rendering targets only. 1557 */ 1558 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1559 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1560 1561 /* 1562 * We adjust stems to full pixels unless in `light' or `lcd' mode. 1563 */ 1564 if ( mode != FT_RENDER_MODE_LIGHT && mode != FT_RENDER_MODE_LCD ) 1565 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1566 1567 if ( mode == FT_RENDER_MODE_MONO ) 1568 other_flags |= AF_LATIN_HINTS_MONO; 1569 1570 /* 1571 * In `light' or `lcd' mode we disable horizontal hinting completely. 1572 * We also do it if the face is italic. 1573 */ 1574 if ( mode == FT_RENDER_MODE_LIGHT || mode == FT_RENDER_MODE_LCD || 1575 ( face->style_flags & FT_STYLE_FLAG_ITALIC ) != 0 ) 1576 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL; 1577 1578 #ifdef AF_CONFIG_OPTION_USE_WARPER 1579 /* get (global) warper flag */ 1580 if ( !metrics->root.globals->module->warping ) 1581 scaler_flags |= AF_SCALER_FLAG_NO_WARPER; 1582 #endif 1583 1584 hints->scaler_flags = scaler_flags; 1585 hints->other_flags = other_flags; 1586 1587 return 0; 1588 } 1589 1590 1591 /*************************************************************************/ 1592 /*************************************************************************/ 1593 /***** *****/ 1594 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/ 1595 /***** *****/ 1596 /*************************************************************************/ 1597 /*************************************************************************/ 1598 1599 /* snap a given width in scaled coordinates to one of the */ 1600 /* current standard widths */ 1601 1602 static FT_Pos af_latin2_snap_width(AF_Width widths,FT_UInt count,FT_Pos width)1603 af_latin2_snap_width( AF_Width widths, 1604 FT_UInt count, 1605 FT_Pos width ) 1606 { 1607 FT_UInt n; 1608 FT_Pos best = 64 + 32 + 2; 1609 FT_Pos reference = width; 1610 FT_Pos scaled; 1611 1612 1613 for ( n = 0; n < count; n++ ) 1614 { 1615 FT_Pos w; 1616 FT_Pos dist; 1617 1618 1619 w = widths[n].cur; 1620 dist = width - w; 1621 if ( dist < 0 ) 1622 dist = -dist; 1623 if ( dist < best ) 1624 { 1625 best = dist; 1626 reference = w; 1627 } 1628 } 1629 1630 scaled = FT_PIX_ROUND( reference ); 1631 1632 if ( width >= reference ) 1633 { 1634 if ( width < scaled + 48 ) 1635 width = reference; 1636 } 1637 else 1638 { 1639 if ( width > scaled - 48 ) 1640 width = reference; 1641 } 1642 1643 return width; 1644 } 1645 1646 1647 /* compute the snapped width of a given stem */ 1648 1649 static FT_Pos af_latin2_compute_stem_width(AF_GlyphHints hints,AF_Dimension dim,FT_Pos width,FT_UInt base_flags,FT_UInt stem_flags)1650 af_latin2_compute_stem_width( AF_GlyphHints hints, 1651 AF_Dimension dim, 1652 FT_Pos width, 1653 FT_UInt base_flags, 1654 FT_UInt stem_flags ) 1655 { 1656 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics; 1657 AF_LatinAxis axis = & metrics->axis[dim]; 1658 FT_Pos dist = width; 1659 FT_Int sign = 0; 1660 FT_Int vertical = ( dim == AF_DIMENSION_VERT ); 1661 1662 FT_UNUSED( base_flags ); 1663 1664 1665 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) || 1666 axis->extra_light ) 1667 return width; 1668 1669 if ( dist < 0 ) 1670 { 1671 dist = -width; 1672 sign = 1; 1673 } 1674 1675 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1676 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1677 { 1678 /* smooth hinting process: very lightly quantize the stem width */ 1679 1680 /* leave the widths of serifs alone */ 1681 1682 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) ) 1683 goto Done_Width; 1684 1685 #if 0 1686 else if ( ( base_flags & AF_EDGE_ROUND ) ) 1687 { 1688 if ( dist < 80 ) 1689 dist = 64; 1690 } 1691 else if ( dist < 56 ) 1692 dist = 56; 1693 #endif 1694 if ( axis->width_count > 0 ) 1695 { 1696 FT_Pos delta; 1697 1698 1699 /* compare to standard width */ 1700 if ( axis->width_count > 0 ) 1701 { 1702 delta = dist - axis->widths[0].cur; 1703 1704 if ( delta < 0 ) 1705 delta = -delta; 1706 1707 if ( delta < 40 ) 1708 { 1709 dist = axis->widths[0].cur; 1710 if ( dist < 48 ) 1711 dist = 48; 1712 1713 goto Done_Width; 1714 } 1715 } 1716 1717 if ( dist < 3 * 64 ) 1718 { 1719 delta = dist & 63; 1720 dist &= -64; 1721 1722 if ( delta < 10 ) 1723 dist += delta; 1724 1725 else if ( delta < 32 ) 1726 dist += 10; 1727 1728 else if ( delta < 54 ) 1729 dist += 54; 1730 1731 else 1732 dist += delta; 1733 } 1734 else 1735 dist = ( dist + 32 ) & ~63; 1736 } 1737 } 1738 else 1739 { 1740 /* strong hinting process: snap the stem width to integer pixels */ 1741 FT_Pos org_dist = dist; 1742 1743 1744 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist ); 1745 1746 if ( vertical ) 1747 { 1748 /* in the case of vertical hinting, always round */ 1749 /* the stem heights to integer pixels */ 1750 1751 if ( dist >= 64 ) 1752 dist = ( dist + 16 ) & ~63; 1753 else 1754 dist = 64; 1755 } 1756 else 1757 { 1758 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1759 { 1760 /* monochrome horizontal hinting: snap widths to integer pixels */ 1761 /* with a different threshold */ 1762 1763 if ( dist < 64 ) 1764 dist = 64; 1765 else 1766 dist = ( dist + 32 ) & ~63; 1767 } 1768 else 1769 { 1770 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1771 /* approach: we strengthen small stems, round stems whose size */ 1772 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1773 1774 if ( dist < 48 ) 1775 dist = ( dist + 64 ) >> 1; 1776 1777 else if ( dist < 128 ) 1778 { 1779 /* We only round to an integer width if the corresponding */ 1780 /* distortion is less than 1/4 pixel. Otherwise this */ 1781 /* makes everything worse since the diagonals, which are */ 1782 /* not hinted, appear a lot bolder or thinner than the */ 1783 /* vertical stems. */ 1784 1785 FT_Int delta; 1786 1787 1788 dist = ( dist + 22 ) & ~63; 1789 delta = dist - org_dist; 1790 if ( delta < 0 ) 1791 delta = -delta; 1792 1793 if ( delta >= 16 ) 1794 { 1795 dist = org_dist; 1796 if ( dist < 48 ) 1797 dist = ( dist + 64 ) >> 1; 1798 } 1799 } 1800 else 1801 /* round otherwise to prevent color fringes in LCD mode */ 1802 dist = ( dist + 32 ) & ~63; 1803 } 1804 } 1805 } 1806 1807 Done_Width: 1808 if ( sign ) 1809 dist = -dist; 1810 1811 return dist; 1812 } 1813 1814 1815 /* align one stem edge relative to the previous stem edge */ 1816 1817 static void af_latin2_align_linked_edge(AF_GlyphHints hints,AF_Dimension dim,AF_Edge base_edge,AF_Edge stem_edge)1818 af_latin2_align_linked_edge( AF_GlyphHints hints, 1819 AF_Dimension dim, 1820 AF_Edge base_edge, 1821 AF_Edge stem_edge ) 1822 { 1823 FT_Pos dist = stem_edge->opos - base_edge->opos; 1824 1825 FT_Pos fitted_width = af_latin2_compute_stem_width( hints, dim, dist, 1826 base_edge->flags, 1827 stem_edge->flags ); 1828 1829 1830 stem_edge->pos = base_edge->pos + fitted_width; 1831 1832 FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), " 1833 "dist was %.2f, now %.2f\n", 1834 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0, 1835 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 )); 1836 } 1837 1838 1839 static void af_latin2_align_serif_edge(AF_GlyphHints hints,AF_Edge base,AF_Edge serif)1840 af_latin2_align_serif_edge( AF_GlyphHints hints, 1841 AF_Edge base, 1842 AF_Edge serif ) 1843 { 1844 FT_UNUSED( hints ); 1845 1846 serif->pos = base->pos + ( serif->opos - base->opos ); 1847 } 1848 1849 1850 /*************************************************************************/ 1851 /*************************************************************************/ 1852 /*************************************************************************/ 1853 /**** ****/ 1854 /**** E D G E H I N T I N G ****/ 1855 /**** ****/ 1856 /*************************************************************************/ 1857 /*************************************************************************/ 1858 /*************************************************************************/ 1859 1860 1861 static void af_latin2_hint_edges(AF_GlyphHints hints,AF_Dimension dim)1862 af_latin2_hint_edges( AF_GlyphHints hints, 1863 AF_Dimension dim ) 1864 { 1865 AF_AxisHints axis = &hints->axis[dim]; 1866 AF_Edge edges = axis->edges; 1867 AF_Edge edge_limit = edges + axis->num_edges; 1868 AF_Edge edge; 1869 AF_Edge anchor = NULL; 1870 FT_Int has_serifs = 0; 1871 FT_Pos anchor_drift = 0; 1872 1873 1874 1875 FT_TRACE5(( "==== hinting %s edges =====\n", 1876 dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" )); 1877 1878 /* we begin by aligning all stems relative to the blue zone */ 1879 /* if needed -- that's only for horizontal edges */ 1880 1881 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) ) 1882 { 1883 for ( edge = edges; edge < edge_limit; edge++ ) 1884 { 1885 AF_Width blue; 1886 AF_Edge edge1, edge2; 1887 1888 1889 if ( edge->flags & AF_EDGE_DONE ) 1890 continue; 1891 1892 blue = edge->blue_edge; 1893 edge1 = NULL; 1894 edge2 = edge->link; 1895 1896 if ( blue ) 1897 { 1898 edge1 = edge; 1899 } 1900 else if ( edge2 && edge2->blue_edge ) 1901 { 1902 blue = edge2->blue_edge; 1903 edge1 = edge2; 1904 edge2 = edge; 1905 } 1906 1907 if ( !edge1 ) 1908 continue; 1909 1910 FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), " 1911 "was (%.2f)\n", 1912 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0, 1913 edge1->pos / 64.0 )); 1914 1915 edge1->pos = blue->fit; 1916 edge1->flags |= AF_EDGE_DONE; 1917 1918 if ( edge2 && !edge2->blue_edge ) 1919 { 1920 af_latin2_align_linked_edge( hints, dim, edge1, edge2 ); 1921 edge2->flags |= AF_EDGE_DONE; 1922 } 1923 1924 if ( !anchor ) 1925 { 1926 anchor = edge; 1927 1928 anchor_drift = ( anchor->pos - anchor->opos ); 1929 if ( edge2 ) 1930 anchor_drift = ( anchor_drift + 1931 ( edge2->pos - edge2->opos ) ) >> 1; 1932 } 1933 } 1934 } 1935 1936 /* now we will align all stem edges, trying to maintain the */ 1937 /* relative order of stems in the glyph */ 1938 for ( edge = edges; edge < edge_limit; edge++ ) 1939 { 1940 AF_Edge edge2; 1941 1942 1943 if ( edge->flags & AF_EDGE_DONE ) 1944 continue; 1945 1946 /* skip all non-stem edges */ 1947 edge2 = edge->link; 1948 if ( !edge2 ) 1949 { 1950 has_serifs++; 1951 continue; 1952 } 1953 1954 /* now align the stem */ 1955 1956 /* this should not happen, but it's better to be safe */ 1957 if ( edge2->blue_edge ) 1958 { 1959 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1960 1961 af_latin2_align_linked_edge( hints, dim, edge2, edge ); 1962 edge->flags |= AF_EDGE_DONE; 1963 continue; 1964 } 1965 1966 if ( !anchor ) 1967 { 1968 FT_Pos org_len, org_center, cur_len; 1969 FT_Pos cur_pos1, error1, error2, u_off, d_off; 1970 1971 1972 org_len = edge2->opos - edge->opos; 1973 cur_len = af_latin2_compute_stem_width( hints, dim, org_len, 1974 edge->flags, 1975 edge2->flags ); 1976 if ( cur_len <= 64 ) 1977 u_off = d_off = 32; 1978 else 1979 { 1980 u_off = 38; 1981 d_off = 26; 1982 } 1983 1984 if ( cur_len < 96 ) 1985 { 1986 org_center = edge->opos + ( org_len >> 1 ); 1987 1988 cur_pos1 = FT_PIX_ROUND( org_center ); 1989 1990 error1 = org_center - ( cur_pos1 - u_off ); 1991 if ( error1 < 0 ) 1992 error1 = -error1; 1993 1994 error2 = org_center - ( cur_pos1 + d_off ); 1995 if ( error2 < 0 ) 1996 error2 = -error2; 1997 1998 if ( error1 < error2 ) 1999 cur_pos1 -= u_off; 2000 else 2001 cur_pos1 += d_off; 2002 2003 edge->pos = cur_pos1 - cur_len / 2; 2004 edge2->pos = edge->pos + cur_len; 2005 } 2006 else 2007 edge->pos = FT_PIX_ROUND( edge->opos ); 2008 2009 FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)" 2010 " snapped to (%.2f) (%.2f)\n", 2011 edge-edges, edge->opos / 64.0, 2012 edge2-edges, edge2->opos / 64.0, 2013 edge->pos / 64.0, edge2->pos / 64.0 )); 2014 anchor = edge; 2015 2016 edge->flags |= AF_EDGE_DONE; 2017 2018 af_latin2_align_linked_edge( hints, dim, edge, edge2 ); 2019 2020 edge2->flags |= AF_EDGE_DONE; 2021 2022 anchor_drift = ( ( anchor->pos - anchor->opos ) + 2023 ( edge2->pos - edge2->opos ) ) >> 1; 2024 2025 FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 )); 2026 } 2027 else 2028 { 2029 FT_Pos org_pos, org_len, org_center, cur_center, cur_len; 2030 FT_Pos org_left, org_right; 2031 2032 2033 org_pos = edge->opos + anchor_drift; 2034 org_len = edge2->opos - edge->opos; 2035 org_center = org_pos + ( org_len >> 1 ); 2036 2037 cur_len = af_latin2_compute_stem_width( hints, dim, org_len, 2038 edge->flags, 2039 edge2->flags ); 2040 2041 org_left = org_pos + ( ( org_len - cur_len ) >> 1 ); 2042 org_right = org_pos + ( ( org_len + cur_len ) >> 1 ); 2043 2044 FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ", 2045 org_left / 64.0, org_right / 64.0 )); 2046 cur_center = org_center; 2047 2048 if ( edge2->flags & AF_EDGE_DONE ) 2049 { 2050 FT_TRACE5(( "\n" )); 2051 edge->pos = edge2->pos - cur_len; 2052 } 2053 else 2054 { 2055 /* we want to compare several displacement, and choose 2056 * the one that increases fitness while minimizing 2057 * distortion as well 2058 */ 2059 FT_Pos displacements[6], scores[6], org, fit, delta; 2060 FT_UInt count = 0; 2061 2062 /* note: don't even try to fit tiny stems */ 2063 if ( cur_len < 32 ) 2064 { 2065 FT_TRACE5(( "tiny stem\n" )); 2066 goto AlignStem; 2067 } 2068 2069 /* if the span is within a single pixel, don't touch it */ 2070 if ( FT_PIX_FLOOR( org_left ) == FT_PIX_CEIL( org_right ) ) 2071 { 2072 FT_TRACE5(( "single pixel stem\n" )); 2073 goto AlignStem; 2074 } 2075 2076 if ( cur_len <= 96 ) 2077 { 2078 /* we want to avoid the absolute worst case which is 2079 * when the left and right edges of the span each represent 2080 * about 50% of the gray. we'd better want to change this 2081 * to 25/75%, since this is much more pleasant to the eye with 2082 * very acceptable distortion 2083 */ 2084 FT_Pos frac_left = org_left & 63; 2085 FT_Pos frac_right = org_right & 63; 2086 2087 if ( frac_left >= 22 && frac_left <= 42 && 2088 frac_right >= 22 && frac_right <= 42 ) 2089 { 2090 org = frac_left; 2091 fit = ( org <= 32 ) ? 16 : 48; 2092 delta = FT_ABS( fit - org ); 2093 displacements[count] = fit - org; 2094 scores[count++] = delta; 2095 FT_TRACE5(( "dispA=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2096 2097 org = frac_right; 2098 fit = ( org <= 32 ) ? 16 : 48; 2099 delta = FT_ABS( fit - org ); 2100 displacements[count] = fit - org; 2101 scores[count++] = delta; 2102 FT_TRACE5(( "dispB=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2103 } 2104 } 2105 2106 /* snapping the left edge to the grid */ 2107 org = org_left; 2108 fit = FT_PIX_ROUND( org ); 2109 delta = FT_ABS( fit - org ); 2110 displacements[count] = fit - org; 2111 scores[count++] = delta; 2112 FT_TRACE5(( "dispC=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2113 2114 /* snapping the right edge to the grid */ 2115 org = org_right; 2116 fit = FT_PIX_ROUND( org ); 2117 delta = FT_ABS( fit - org ); 2118 displacements[count] = fit - org; 2119 scores[count++] = delta; 2120 FT_TRACE5(( "dispD=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2121 2122 /* now find the best displacement */ 2123 { 2124 FT_Pos best_score = scores[0]; 2125 FT_Pos best_disp = displacements[0]; 2126 FT_UInt nn; 2127 2128 for ( nn = 1; nn < count; nn++ ) 2129 { 2130 if ( scores[nn] < best_score ) 2131 { 2132 best_score = scores[nn]; 2133 best_disp = displacements[nn]; 2134 } 2135 } 2136 2137 cur_center = org_center + best_disp; 2138 } 2139 FT_TRACE5(( "\n" )); 2140 } 2141 2142 AlignStem: 2143 edge->pos = cur_center - ( cur_len >> 1 ); 2144 edge2->pos = edge->pos + cur_len; 2145 2146 FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)" 2147 " snapped to (%.2f) and (%.2f)," 2148 " org_len=%.2f cur_len=%.2f\n", 2149 edge-edges, edge->opos / 64.0, 2150 edge2-edges, edge2->opos / 64.0, 2151 edge->pos / 64.0, edge2->pos / 64.0, 2152 org_len / 64.0, cur_len / 64.0 )); 2153 2154 edge->flags |= AF_EDGE_DONE; 2155 edge2->flags |= AF_EDGE_DONE; 2156 2157 if ( edge > edges && edge->pos < edge[-1].pos ) 2158 { 2159 FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n", 2160 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 )); 2161 edge->pos = edge[-1].pos; 2162 } 2163 } 2164 } 2165 2166 /* make sure that lowercase m's maintain their symmetry */ 2167 2168 /* In general, lowercase m's have six vertical edges if they are sans */ 2169 /* serif, or twelve if they are with serifs. This implementation is */ 2170 /* based on that assumption, and seems to work very well with most */ 2171 /* faces. However, if for a certain face this assumption is not */ 2172 /* true, the m is just rendered like before. In addition, any stem */ 2173 /* correction will only be applied to symmetrical glyphs (even if the */ 2174 /* glyph is not an m), so the potential for unwanted distortion is */ 2175 /* relatively low. */ 2176 2177 /* We don't handle horizontal edges since we can't easily assure that */ 2178 /* the third (lowest) stem aligns with the base line; it might end up */ 2179 /* one pixel higher or lower. */ 2180 2181 #if 0 2182 { 2183 FT_Int n_edges = edge_limit - edges; 2184 2185 2186 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 2187 { 2188 AF_Edge edge1, edge2, edge3; 2189 FT_Pos dist1, dist2, span, delta; 2190 2191 2192 if ( n_edges == 6 ) 2193 { 2194 edge1 = edges; 2195 edge2 = edges + 2; 2196 edge3 = edges + 4; 2197 } 2198 else 2199 { 2200 edge1 = edges + 1; 2201 edge2 = edges + 5; 2202 edge3 = edges + 9; 2203 } 2204 2205 dist1 = edge2->opos - edge1->opos; 2206 dist2 = edge3->opos - edge2->opos; 2207 2208 span = dist1 - dist2; 2209 if ( span < 0 ) 2210 span = -span; 2211 2212 if ( span < 8 ) 2213 { 2214 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2215 edge3->pos -= delta; 2216 if ( edge3->link ) 2217 edge3->link->pos -= delta; 2218 2219 /* move the serifs along with the stem */ 2220 if ( n_edges == 12 ) 2221 { 2222 ( edges + 8 )->pos -= delta; 2223 ( edges + 11 )->pos -= delta; 2224 } 2225 2226 edge3->flags |= AF_EDGE_DONE; 2227 if ( edge3->link ) 2228 edge3->link->flags |= AF_EDGE_DONE; 2229 } 2230 } 2231 } 2232 #endif 2233 2234 if ( has_serifs || !anchor ) 2235 { 2236 /* 2237 * now hint the remaining edges (serifs and single) in order 2238 * to complete our processing 2239 */ 2240 for ( edge = edges; edge < edge_limit; edge++ ) 2241 { 2242 FT_Pos delta; 2243 2244 2245 if ( edge->flags & AF_EDGE_DONE ) 2246 continue; 2247 2248 delta = 1000; 2249 2250 if ( edge->serif ) 2251 { 2252 delta = edge->serif->opos - edge->opos; 2253 if ( delta < 0 ) 2254 delta = -delta; 2255 } 2256 2257 if ( delta < 64 + 16 ) 2258 { 2259 af_latin2_align_serif_edge( hints, edge->serif, edge ); 2260 FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)" 2261 " aligned to (%.2f)\n", 2262 edge-edges, edge->opos / 64.0, 2263 edge->serif - edges, edge->serif->opos / 64.0, 2264 edge->pos / 64.0 )); 2265 } 2266 else if ( !anchor ) 2267 { 2268 FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)" 2269 " snapped to (%.2f)\n", 2270 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2271 edge->pos = FT_PIX_ROUND( edge->opos ); 2272 anchor = edge; 2273 } 2274 else 2275 { 2276 AF_Edge before, after; 2277 2278 2279 for ( before = edge - 1; before >= edges; before-- ) 2280 if ( before->flags & AF_EDGE_DONE ) 2281 break; 2282 2283 for ( after = edge + 1; after < edge_limit; after++ ) 2284 if ( after->flags & AF_EDGE_DONE ) 2285 break; 2286 2287 if ( before >= edges && before < edge && 2288 after < edge_limit && after > edge ) 2289 { 2290 if ( after->opos == before->opos ) 2291 edge->pos = before->pos; 2292 else 2293 edge->pos = before->pos + 2294 FT_MulDiv( edge->opos - before->opos, 2295 after->pos - before->pos, 2296 after->opos - before->opos ); 2297 FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)" 2298 " from %d (opos=%.2f)\n", 2299 edge-edges, edge->opos / 64.0, edge->pos / 64.0, 2300 before - edges, before->opos / 64.0 )); 2301 } 2302 else 2303 { 2304 edge->pos = anchor->pos + 2305 ( ( edge->opos - anchor->opos + 16 ) & ~31 ); 2306 2307 FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)" 2308 " snapped to (%.2f)\n", 2309 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2310 } 2311 } 2312 2313 edge->flags |= AF_EDGE_DONE; 2314 2315 if ( edge > edges && edge->pos < edge[-1].pos ) 2316 edge->pos = edge[-1].pos; 2317 2318 if ( edge + 1 < edge_limit && 2319 edge[1].flags & AF_EDGE_DONE && 2320 edge->pos > edge[1].pos ) 2321 edge->pos = edge[1].pos; 2322 } 2323 } 2324 } 2325 2326 2327 static FT_Error af_latin2_hints_apply(FT_UInt glyph_index,AF_GlyphHints hints,FT_Outline * outline,AF_LatinMetrics metrics)2328 af_latin2_hints_apply( FT_UInt glyph_index, 2329 AF_GlyphHints hints, 2330 FT_Outline* outline, 2331 AF_LatinMetrics metrics ) 2332 { 2333 FT_Error error; 2334 int dim; 2335 2336 FT_UNUSED( glyph_index ); 2337 2338 2339 error = af_glyph_hints_reload( hints, outline ); 2340 if ( error ) 2341 goto Exit; 2342 2343 /* analyze glyph outline */ 2344 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2345 { 2346 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2347 if ( error ) 2348 goto Exit; 2349 } 2350 2351 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2352 { 2353 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT ); 2354 if ( error ) 2355 goto Exit; 2356 2357 af_latin2_hints_compute_blue_edges( hints, metrics ); 2358 } 2359 2360 /* grid-fit the outline */ 2361 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2362 { 2363 #ifdef AF_CONFIG_OPTION_USE_WARPER 2364 if ( dim == AF_DIMENSION_HORZ && 2365 metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL && 2366 AF_HINTS_DO_WARP( hints ) ) 2367 { 2368 AF_WarperRec warper; 2369 FT_Fixed scale; 2370 FT_Pos delta; 2371 2372 2373 af_warper_compute( &warper, hints, dim, &scale, &delta ); 2374 af_glyph_hints_scale_dim( hints, dim, scale, delta ); 2375 continue; 2376 } 2377 #endif /* AF_CONFIG_OPTION_USE_WARPER */ 2378 2379 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2380 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2381 { 2382 af_latin2_hint_edges( hints, (AF_Dimension)dim ); 2383 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim ); 2384 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2385 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2386 } 2387 } 2388 af_glyph_hints_save( hints, outline ); 2389 2390 Exit: 2391 return error; 2392 } 2393 2394 2395 /*************************************************************************/ 2396 /*************************************************************************/ 2397 /***** *****/ 2398 /***** L A T I N S C R I P T C L A S S *****/ 2399 /***** *****/ 2400 /*************************************************************************/ 2401 /*************************************************************************/ 2402 2403 2404 AF_DEFINE_WRITING_SYSTEM_CLASS( 2405 af_latin2_writing_system_class, 2406 2407 AF_WRITING_SYSTEM_LATIN2, 2408 2409 sizeof ( AF_LatinMetricsRec ), 2410 2411 (AF_WritingSystem_InitMetricsFunc) af_latin2_metrics_init, /* style_metrics_init */ 2412 (AF_WritingSystem_ScaleMetricsFunc)af_latin2_metrics_scale, /* style_metrics_scale */ 2413 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */ 2414 (AF_WritingSystem_GetStdWidthsFunc)af_latin2_get_standard_widths, /* style_metrics_getstdw */ 2415 2416 (AF_WritingSystem_InitHintsFunc) af_latin2_hints_init, /* style_hints_init */ 2417 (AF_WritingSystem_ApplyHintsFunc) af_latin2_hints_apply /* style_hints_apply */ 2418 ) 2419 2420 #else /* !FT_OPTION_AUTOFIT2 */ 2421 2422 /* ANSI C doesn't like empty source files */ 2423 typedef int _af_latin2_dummy; 2424 2425 #endif /* !FT_OPTION_AUTOFIT2 */ 2426 2427 2428 /* END */ 2429