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 2003-2017 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 #include "afglobal.h" 27 #include "aflatin.h" 28 #include "aflatin2.h" 29 #include "aferrors.h" 30 31 32 #ifdef AF_CONFIG_OPTION_USE_WARPER 33 #include "afwarp.h" 34 #endif 35 36 37 /*************************************************************************/ 38 /* */ 39 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 40 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 41 /* messages during execution. */ 42 /* */ 43 #undef FT_COMPONENT 44 #define FT_COMPONENT trace_aflatin2 45 46 47 FT_LOCAL_DEF( FT_Error ) 48 af_latin2_hints_compute_segments( AF_GlyphHints hints, 49 AF_Dimension dim ); 50 51 FT_LOCAL_DEF( void ) 52 af_latin2_hints_link_segments( AF_GlyphHints hints, 53 AF_Dimension dim ); 54 55 /*************************************************************************/ 56 /*************************************************************************/ 57 /***** *****/ 58 /***** L A T I N G L O B A L M E T R I C S *****/ 59 /***** *****/ 60 /*************************************************************************/ 61 /*************************************************************************/ 62 63 FT_LOCAL_DEF( void ) af_latin2_metrics_init_widths(AF_LatinMetrics metrics,FT_Face face)64 af_latin2_metrics_init_widths( AF_LatinMetrics metrics, 65 FT_Face face ) 66 { 67 /* scan the array of segments in each direction */ 68 AF_GlyphHintsRec hints[1]; 69 70 71 af_glyph_hints_init( hints, face->memory ); 72 73 metrics->axis[AF_DIMENSION_HORZ].width_count = 0; 74 metrics->axis[AF_DIMENSION_VERT].width_count = 0; 75 76 { 77 FT_Error error; 78 FT_UInt glyph_index; 79 int dim; 80 AF_LatinMetricsRec dummy[1]; 81 AF_Scaler scaler = &dummy->root.scaler; 82 83 84 glyph_index = FT_Get_Char_Index( 85 face, 86 metrics->root.style_class->standard_char ); 87 if ( glyph_index == 0 ) 88 goto Exit; 89 90 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 91 if ( error || face->glyph->outline.n_points <= 0 ) 92 goto Exit; 93 94 FT_ZERO( dummy ); 95 96 dummy->units_per_em = metrics->units_per_em; 97 scaler->x_scale = scaler->y_scale = 0x10000L; 98 scaler->x_delta = scaler->y_delta = 0; 99 scaler->face = face; 100 scaler->render_mode = FT_RENDER_MODE_NORMAL; 101 scaler->flags = 0; 102 103 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy ); 104 105 error = af_glyph_hints_reload( hints, &face->glyph->outline ); 106 if ( error ) 107 goto Exit; 108 109 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 110 { 111 AF_LatinAxis axis = &metrics->axis[dim]; 112 AF_AxisHints axhints = &hints->axis[dim]; 113 AF_Segment seg, limit, link; 114 FT_UInt num_widths = 0; 115 116 117 error = af_latin2_hints_compute_segments( hints, 118 (AF_Dimension)dim ); 119 if ( error ) 120 goto Exit; 121 122 af_latin2_hints_link_segments( hints, 123 (AF_Dimension)dim ); 124 125 seg = axhints->segments; 126 limit = seg + axhints->num_segments; 127 128 for ( ; seg < limit; seg++ ) 129 { 130 link = seg->link; 131 132 /* we only consider stem segments there! */ 133 if ( link && link->link == seg && link > seg ) 134 { 135 FT_Pos dist; 136 137 138 dist = seg->pos - link->pos; 139 if ( dist < 0 ) 140 dist = -dist; 141 142 if ( num_widths < AF_LATIN_MAX_WIDTHS ) 143 axis->widths[num_widths++].org = dist; 144 } 145 } 146 147 af_sort_widths( num_widths, axis->widths ); 148 axis->width_count = num_widths; 149 } 150 151 Exit: 152 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 153 { 154 AF_LatinAxis axis = &metrics->axis[dim]; 155 FT_Pos stdw; 156 157 158 stdw = ( axis->width_count > 0 ) 159 ? axis->widths[0].org 160 : AF_LATIN_CONSTANT( metrics, 50 ); 161 162 /* let's try 20% of the smallest width */ 163 axis->edge_distance_threshold = stdw / 5; 164 axis->standard_width = stdw; 165 axis->extra_light = 0; 166 } 167 } 168 169 af_glyph_hints_done( hints ); 170 } 171 172 173 174 #define AF_LATIN_MAX_TEST_CHARACTERS 12 175 176 177 static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES] 178 [AF_LATIN_MAX_TEST_CHARACTERS+1] = 179 { 180 "THEZOCQS", 181 "HEZLOCUS", 182 "fijkdbh", 183 "xzroesc", 184 "xzroesc", 185 "pqgjy" 186 }; 187 188 189 static void af_latin2_metrics_init_blues(AF_LatinMetrics metrics,FT_Face face)190 af_latin2_metrics_init_blues( AF_LatinMetrics metrics, 191 FT_Face face ) 192 { 193 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS]; 194 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS]; 195 FT_Int num_flats; 196 FT_Int num_rounds; 197 FT_Int bb; 198 AF_LatinBlue blue; 199 FT_Error error; 200 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT]; 201 FT_GlyphSlot glyph = face->glyph; 202 203 204 /* we compute the blues simply by loading each character from the */ 205 /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */ 206 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */ 207 208 FT_TRACE5(( "blue zones computation\n" 209 "======================\n\n" )); 210 211 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 212 { 213 const char* p = af_latin2_blue_chars[bb]; 214 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS; 215 FT_Pos* blue_ref; 216 FT_Pos* blue_shoot; 217 218 219 FT_TRACE5(( "blue zone %d:\n", bb )); 220 221 num_flats = 0; 222 num_rounds = 0; 223 224 for ( ; p < limit && *p; p++ ) 225 { 226 FT_UInt glyph_index; 227 FT_Int best_point, best_y, best_first, best_last; 228 FT_Vector* points; 229 FT_Bool round; 230 231 232 /* load the character in the face -- skip unknown or empty ones */ 233 glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p ); 234 if ( glyph_index == 0 ) 235 continue; 236 237 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 238 if ( error || glyph->outline.n_points <= 0 ) 239 continue; 240 241 /* now compute min or max point indices and coordinates */ 242 points = glyph->outline.points; 243 best_point = -1; 244 best_y = 0; /* make compiler happy */ 245 best_first = 0; /* ditto */ 246 best_last = 0; /* ditto */ 247 248 { 249 FT_Int nn; 250 FT_Int first = 0; 251 FT_Int last = -1; 252 253 254 for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ ) 255 { 256 FT_Int old_best_point = best_point; 257 FT_Int pp; 258 259 260 last = glyph->outline.contours[nn]; 261 262 /* Avoid single-point contours since they are never rasterized. */ 263 /* In some fonts, they correspond to mark attachment points */ 264 /* which are way outside of the glyph's real outline. */ 265 if ( last == first ) 266 continue; 267 268 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 269 { 270 for ( pp = first; pp <= last; pp++ ) 271 if ( best_point < 0 || points[pp].y > best_y ) 272 { 273 best_point = pp; 274 best_y = points[pp].y; 275 } 276 } 277 else 278 { 279 for ( pp = first; pp <= last; pp++ ) 280 if ( best_point < 0 || points[pp].y < best_y ) 281 { 282 best_point = pp; 283 best_y = points[pp].y; 284 } 285 } 286 287 if ( best_point != old_best_point ) 288 { 289 best_first = first; 290 best_last = last; 291 } 292 } 293 FT_TRACE5(( " %c %d", *p, best_y )); 294 } 295 296 /* now check whether the point belongs to a straight or round */ 297 /* segment; we first need to find in which contour the extremum */ 298 /* lies, then inspect its previous and next points */ 299 { 300 FT_Pos best_x = points[best_point].x; 301 FT_Int start, end, prev, next; 302 FT_Pos dist; 303 304 305 /* now look for the previous and next points that are not on the */ 306 /* same Y coordinate. Threshold the `closeness'... */ 307 start = end = best_point; 308 309 do 310 { 311 prev = start - 1; 312 if ( prev < best_first ) 313 prev = best_last; 314 315 dist = FT_ABS( points[prev].y - best_y ); 316 /* accept a small distance or a small angle (both values are */ 317 /* heuristic; value 20 corresponds to approx. 2.9 degrees) */ 318 if ( dist > 5 ) 319 if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist ) 320 break; 321 322 start = prev; 323 324 } while ( start != best_point ); 325 326 do 327 { 328 next = end + 1; 329 if ( next > best_last ) 330 next = best_first; 331 332 dist = FT_ABS( points[next].y - best_y ); 333 if ( dist > 5 ) 334 if ( FT_ABS( points[next].x - best_x ) <= 20 * dist ) 335 break; 336 337 end = next; 338 339 } while ( end != best_point ); 340 341 /* now, set the `round' flag depending on the segment's kind */ 342 round = FT_BOOL( 343 FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON || 344 FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON ); 345 346 FT_TRACE5(( " (%s)\n", round ? "round" : "flat" )); 347 } 348 349 if ( round ) 350 rounds[num_rounds++] = best_y; 351 else 352 flats[num_flats++] = best_y; 353 } 354 355 if ( num_flats == 0 && num_rounds == 0 ) 356 { 357 /* 358 * we couldn't find a single glyph to compute this blue zone, 359 * we will simply ignore it then 360 */ 361 FT_TRACE5(( " empty\n" )); 362 continue; 363 } 364 365 /* we have computed the contents of the `rounds' and `flats' tables, */ 366 /* now determine the reference and overshoot position of the blue -- */ 367 /* we simply take the median value after a simple sort */ 368 af_sort_pos( num_rounds, rounds ); 369 af_sort_pos( num_flats, flats ); 370 371 blue = & axis->blues[axis->blue_count]; 372 blue_ref = & blue->ref.org; 373 blue_shoot = & blue->shoot.org; 374 375 axis->blue_count++; 376 377 if ( num_flats == 0 ) 378 { 379 *blue_ref = 380 *blue_shoot = rounds[num_rounds / 2]; 381 } 382 else if ( num_rounds == 0 ) 383 { 384 *blue_ref = 385 *blue_shoot = flats[num_flats / 2]; 386 } 387 else 388 { 389 *blue_ref = flats[num_flats / 2]; 390 *blue_shoot = rounds[num_rounds / 2]; 391 } 392 393 /* there are sometimes problems: if the overshoot position of top */ 394 /* zones is under its reference position, or the opposite for bottom */ 395 /* zones. We must thus check everything there and correct the errors */ 396 if ( *blue_shoot != *blue_ref ) 397 { 398 FT_Pos ref = *blue_ref; 399 FT_Pos shoot = *blue_shoot; 400 FT_Bool over_ref = FT_BOOL( shoot > ref ); 401 402 403 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref ) 404 { 405 *blue_ref = 406 *blue_shoot = ( shoot + ref ) / 2; 407 408 FT_TRACE5(( " [overshoot smaller than reference," 409 " taking mean value]\n" )); 410 } 411 } 412 413 blue->flags = 0; 414 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 415 blue->flags |= AF_LATIN_BLUE_TOP; 416 417 /* 418 * The following flag is used later to adjust the y and x scales 419 * in order to optimize the pixel grid alignment of the top of small 420 * letters. 421 */ 422 if ( AF_LATIN_IS_X_HEIGHT_BLUE( bb ) ) 423 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT; 424 425 FT_TRACE5(( " -> reference = %ld\n" 426 " overshoot = %ld\n", 427 *blue_ref, *blue_shoot )); 428 } 429 430 return; 431 } 432 433 434 FT_LOCAL_DEF( void ) af_latin2_metrics_check_digits(AF_LatinMetrics metrics,FT_Face face)435 af_latin2_metrics_check_digits( AF_LatinMetrics metrics, 436 FT_Face face ) 437 { 438 FT_UInt i; 439 FT_Bool started = 0, same_width = 1; 440 FT_Fixed advance, old_advance = 0; 441 442 443 /* check whether all ASCII digits have the same advance width; */ 444 /* digit `0' is 0x30 in all supported charmaps */ 445 for ( i = 0x30; i <= 0x39; i++ ) 446 { 447 FT_UInt glyph_index; 448 449 450 glyph_index = FT_Get_Char_Index( face, i ); 451 if ( glyph_index == 0 ) 452 continue; 453 454 if ( FT_Get_Advance( face, glyph_index, 455 FT_LOAD_NO_SCALE | 456 FT_LOAD_NO_HINTING | 457 FT_LOAD_IGNORE_TRANSFORM, 458 &advance ) ) 459 continue; 460 461 if ( started ) 462 { 463 if ( advance != old_advance ) 464 { 465 same_width = 0; 466 break; 467 } 468 } 469 else 470 { 471 old_advance = advance; 472 started = 1; 473 } 474 } 475 476 metrics->root.digits_have_same_width = same_width; 477 } 478 479 480 FT_LOCAL_DEF( FT_Error ) af_latin2_metrics_init(AF_LatinMetrics metrics,FT_Face face)481 af_latin2_metrics_init( AF_LatinMetrics metrics, 482 FT_Face face ) 483 { 484 FT_Error error = FT_Err_Ok; 485 FT_CharMap oldmap = face->charmap; 486 FT_UInt ee; 487 488 static const FT_Encoding latin_encodings[] = 489 { 490 FT_ENCODING_UNICODE, 491 FT_ENCODING_APPLE_ROMAN, 492 FT_ENCODING_ADOBE_STANDARD, 493 FT_ENCODING_ADOBE_LATIN_1, 494 FT_ENCODING_NONE /* end of list */ 495 }; 496 497 498 metrics->units_per_em = face->units_per_EM; 499 500 /* do we have a latin charmap in there? */ 501 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ ) 502 { 503 error = FT_Select_Charmap( face, latin_encodings[ee] ); 504 if ( !error ) 505 break; 506 } 507 508 if ( !error ) 509 { 510 af_latin2_metrics_init_widths( metrics, face ); 511 af_latin2_metrics_init_blues( metrics, face ); 512 af_latin2_metrics_check_digits( metrics, face ); 513 } 514 515 FT_Set_Charmap( face, oldmap ); 516 return FT_Err_Ok; 517 } 518 519 520 static void af_latin2_metrics_scale_dim(AF_LatinMetrics metrics,AF_Scaler scaler,AF_Dimension dim)521 af_latin2_metrics_scale_dim( AF_LatinMetrics metrics, 522 AF_Scaler scaler, 523 AF_Dimension dim ) 524 { 525 FT_Fixed scale; 526 FT_Pos delta; 527 AF_LatinAxis axis; 528 FT_UInt nn; 529 530 531 if ( dim == AF_DIMENSION_HORZ ) 532 { 533 scale = scaler->x_scale; 534 delta = scaler->x_delta; 535 } 536 else 537 { 538 scale = scaler->y_scale; 539 delta = scaler->y_delta; 540 } 541 542 axis = &metrics->axis[dim]; 543 544 if ( axis->org_scale == scale && axis->org_delta == delta ) 545 return; 546 547 axis->org_scale = scale; 548 axis->org_delta = delta; 549 550 /* 551 * correct Y scale to optimize the alignment of the top of small 552 * letters to the pixel grid 553 */ 554 if ( dim == AF_DIMENSION_VERT ) 555 { 556 AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT]; 557 AF_LatinBlue blue = NULL; 558 559 560 for ( nn = 0; nn < vaxis->blue_count; nn++ ) 561 { 562 if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT ) 563 { 564 blue = &vaxis->blues[nn]; 565 break; 566 } 567 } 568 569 if ( blue ) 570 { 571 FT_Pos scaled; 572 FT_Pos threshold; 573 FT_Pos fitted; 574 FT_UInt limit; 575 FT_UInt ppem; 576 577 578 scaled = FT_MulFix( blue->shoot.org, scaler->y_scale ); 579 ppem = metrics->root.scaler.face->size->metrics.x_ppem; 580 limit = metrics->root.globals->increase_x_height; 581 threshold = 40; 582 583 /* if the `increase-x-height' property is active, */ 584 /* we round up much more often */ 585 if ( limit && 586 ppem <= limit && 587 ppem >= AF_PROP_INCREASE_X_HEIGHT_MIN ) 588 threshold = 52; 589 590 fitted = ( scaled + threshold ) & ~63; 591 592 #if 1 593 if ( scaled != fitted ) 594 { 595 scale = FT_MulDiv( scale, fitted, scaled ); 596 FT_TRACE5(( "== scaled x-top = %.2g" 597 " fitted = %.2g, scaling = %.4g\n", 598 scaled / 64.0, fitted / 64.0, 599 ( fitted * 1.0 ) / scaled )); 600 } 601 #endif 602 } 603 } 604 605 axis->scale = scale; 606 axis->delta = delta; 607 608 if ( dim == AF_DIMENSION_HORZ ) 609 { 610 metrics->root.scaler.x_scale = scale; 611 metrics->root.scaler.x_delta = delta; 612 } 613 else 614 { 615 metrics->root.scaler.y_scale = scale; 616 metrics->root.scaler.y_delta = delta; 617 } 618 619 /* scale the standard widths */ 620 for ( nn = 0; nn < axis->width_count; nn++ ) 621 { 622 AF_Width width = axis->widths + nn; 623 624 625 width->cur = FT_MulFix( width->org, scale ); 626 width->fit = width->cur; 627 } 628 629 /* an extra-light axis corresponds to a standard width that is */ 630 /* smaller than 5/8 pixels */ 631 axis->extra_light = 632 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 ); 633 634 if ( dim == AF_DIMENSION_VERT ) 635 { 636 /* scale the blue zones */ 637 for ( nn = 0; nn < axis->blue_count; nn++ ) 638 { 639 AF_LatinBlue blue = &axis->blues[nn]; 640 FT_Pos dist; 641 642 643 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 644 blue->ref.fit = blue->ref.cur; 645 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 646 blue->shoot.fit = blue->shoot.cur; 647 blue->flags &= ~AF_LATIN_BLUE_ACTIVE; 648 649 /* a blue zone is only active if it is less than 3/4 pixels tall */ 650 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 651 if ( dist <= 48 && dist >= -48 ) 652 { 653 FT_Pos delta1, delta2; 654 655 delta1 = blue->shoot.org - blue->ref.org; 656 delta2 = delta1; 657 if ( delta1 < 0 ) 658 delta2 = -delta2; 659 660 delta2 = FT_MulFix( delta2, scale ); 661 662 if ( delta2 < 32 ) 663 delta2 = 0; 664 else if ( delta2 < 64 ) 665 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 666 else 667 delta2 = FT_PIX_ROUND( delta2 ); 668 669 if ( delta1 < 0 ) 670 delta2 = -delta2; 671 672 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 673 blue->shoot.fit = blue->ref.fit + delta2; 674 675 FT_TRACE5(( ">> activating blue zone %d:" 676 " ref.cur=%.2g ref.fit=%.2g" 677 " shoot.cur=%.2g shoot.fit=%.2g\n", 678 nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0, 679 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 )); 680 681 blue->flags |= AF_LATIN_BLUE_ACTIVE; 682 } 683 } 684 } 685 } 686 687 688 FT_LOCAL_DEF( void ) af_latin2_metrics_scale(AF_LatinMetrics metrics,AF_Scaler scaler)689 af_latin2_metrics_scale( AF_LatinMetrics metrics, 690 AF_Scaler scaler ) 691 { 692 metrics->root.scaler.render_mode = scaler->render_mode; 693 metrics->root.scaler.face = scaler->face; 694 metrics->root.scaler.flags = scaler->flags; 695 696 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 697 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 698 } 699 700 701 /* Extract standard_width from writing system/script specific */ 702 /* metrics class. */ 703 704 FT_LOCAL_DEF( void ) af_latin2_get_standard_widths(AF_LatinMetrics metrics,FT_Pos * stdHW,FT_Pos * stdVW)705 af_latin2_get_standard_widths( AF_LatinMetrics metrics, 706 FT_Pos* stdHW, 707 FT_Pos* stdVW ) 708 { 709 if ( stdHW ) 710 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width; 711 712 if ( stdVW ) 713 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width; 714 } 715 716 717 /*************************************************************************/ 718 /*************************************************************************/ 719 /***** *****/ 720 /***** L A T I N G L Y P H A N A L Y S I S *****/ 721 /***** *****/ 722 /*************************************************************************/ 723 /*************************************************************************/ 724 725 #define SORT_SEGMENTS 726 727 FT_LOCAL_DEF( FT_Error ) af_latin2_hints_compute_segments(AF_GlyphHints hints,AF_Dimension dim)728 af_latin2_hints_compute_segments( AF_GlyphHints hints, 729 AF_Dimension dim ) 730 { 731 AF_AxisHints axis = &hints->axis[dim]; 732 FT_Memory memory = hints->memory; 733 FT_Error error = FT_Err_Ok; 734 AF_Segment segment = NULL; 735 AF_SegmentRec seg0; 736 AF_Point* contour = hints->contours; 737 AF_Point* contour_limit = contour + hints->num_contours; 738 AF_Direction major_dir, segment_dir; 739 740 741 FT_ZERO( &seg0 ); 742 seg0.score = 32000; 743 seg0.flags = AF_EDGE_NORMAL; 744 745 major_dir = (AF_Direction)FT_ABS( axis->major_dir ); 746 segment_dir = major_dir; 747 748 axis->num_segments = 0; 749 750 /* set up (u,v) in each point */ 751 if ( dim == AF_DIMENSION_HORZ ) 752 { 753 AF_Point point = hints->points; 754 AF_Point limit = point + hints->num_points; 755 756 757 for ( ; point < limit; point++ ) 758 { 759 point->u = point->fx; 760 point->v = point->fy; 761 } 762 } 763 else 764 { 765 AF_Point point = hints->points; 766 AF_Point limit = point + hints->num_points; 767 768 769 for ( ; point < limit; point++ ) 770 { 771 point->u = point->fy; 772 point->v = point->fx; 773 } 774 } 775 776 /* do each contour separately */ 777 for ( ; contour < contour_limit; contour++ ) 778 { 779 AF_Point point = contour[0]; 780 AF_Point start = point; 781 AF_Point last = point->prev; 782 783 784 if ( point == last ) /* skip singletons -- just in case */ 785 continue; 786 787 /* already on an edge ?, backtrack to find its start */ 788 if ( FT_ABS( point->in_dir ) == major_dir ) 789 { 790 point = point->prev; 791 792 while ( point->in_dir == start->in_dir ) 793 point = point->prev; 794 } 795 else /* otherwise, find first segment start, if any */ 796 { 797 while ( FT_ABS( point->out_dir ) != major_dir ) 798 { 799 point = point->next; 800 801 if ( point == start ) 802 goto NextContour; 803 } 804 } 805 806 start = point; 807 808 for (;;) 809 { 810 AF_Point first; 811 FT_Pos min_u, min_v, max_u, max_v; 812 813 /* we're at the start of a new segment */ 814 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir && 815 point->in_dir != point->out_dir ); 816 first = point; 817 818 min_u = max_u = point->u; 819 min_v = max_v = point->v; 820 821 point = point->next; 822 823 while ( point->out_dir == first->out_dir ) 824 { 825 point = point->next; 826 827 if ( point->u < min_u ) 828 min_u = point->u; 829 830 if ( point->u > max_u ) 831 max_u = point->u; 832 } 833 834 if ( point->v < min_v ) 835 min_v = point->v; 836 837 if ( point->v > max_v ) 838 max_v = point->v; 839 840 /* record new segment */ 841 error = af_axis_hints_new_segment( axis, memory, &segment ); 842 if ( error ) 843 goto Exit; 844 845 segment[0] = seg0; 846 segment->dir = first->out_dir; 847 segment->first = first; 848 segment->last = point; 849 segment->pos = (FT_Short)( ( min_u + max_u ) >> 1 ); 850 segment->min_coord = (FT_Short) min_v; 851 segment->max_coord = (FT_Short) max_v; 852 segment->height = (FT_Short)( max_v - min_v ); 853 854 /* a segment is round if it doesn't have successive */ 855 /* on-curve points. */ 856 { 857 AF_Point pt = first; 858 AF_Point last = point; 859 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL; 860 FT_UInt f1; 861 862 863 segment->flags &= ~AF_EDGE_ROUND; 864 865 for ( ; pt != last; f0 = f1 ) 866 { 867 pt = pt->next; 868 f1 = pt->flags & AF_FLAG_CONTROL; 869 870 if ( !f0 && !f1 ) 871 break; 872 873 if ( pt == last ) 874 segment->flags |= AF_EDGE_ROUND; 875 } 876 } 877 878 /* this can happen in the case of a degenerate contour 879 * e.g. a 2-point vertical contour 880 */ 881 if ( point == start ) 882 break; 883 884 /* jump to the start of the next segment, if any */ 885 while ( FT_ABS( point->out_dir ) != major_dir ) 886 { 887 point = point->next; 888 889 if ( point == start ) 890 goto NextContour; 891 } 892 } 893 894 NextContour: 895 ; 896 } /* contours */ 897 898 /* now slightly increase the height of segments when this makes */ 899 /* sense -- this is used to better detect and ignore serifs */ 900 { 901 AF_Segment segments = axis->segments; 902 AF_Segment segments_end = segments + axis->num_segments; 903 904 905 for ( segment = segments; segment < segments_end; segment++ ) 906 { 907 AF_Point first = segment->first; 908 AF_Point last = segment->last; 909 AF_Point p; 910 FT_Pos first_v = first->v; 911 FT_Pos last_v = last->v; 912 913 914 if ( first_v < last_v ) 915 { 916 p = first->prev; 917 if ( p->v < first_v ) 918 segment->height = (FT_Short)( segment->height + 919 ( ( first_v - p->v ) >> 1 ) ); 920 921 p = last->next; 922 if ( p->v > last_v ) 923 segment->height = (FT_Short)( segment->height + 924 ( ( p->v - last_v ) >> 1 ) ); 925 } 926 else 927 { 928 p = first->prev; 929 if ( p->v > first_v ) 930 segment->height = (FT_Short)( segment->height + 931 ( ( p->v - first_v ) >> 1 ) ); 932 933 p = last->next; 934 if ( p->v < last_v ) 935 segment->height = (FT_Short)( segment->height + 936 ( ( last_v - p->v ) >> 1 ) ); 937 } 938 } 939 } 940 941 #ifdef AF_SORT_SEGMENTS 942 /* place all segments with a negative direction to the start 943 * of the array, used to speed up segment linking later... 944 */ 945 { 946 AF_Segment segments = axis->segments; 947 FT_UInt count = axis->num_segments; 948 FT_UInt ii, jj; 949 950 for ( ii = 0; ii < count; ii++ ) 951 { 952 if ( segments[ii].dir > 0 ) 953 { 954 for ( jj = ii + 1; jj < count; jj++ ) 955 { 956 if ( segments[jj].dir < 0 ) 957 { 958 AF_SegmentRec tmp; 959 960 961 tmp = segments[ii]; 962 segments[ii] = segments[jj]; 963 segments[jj] = tmp; 964 965 break; 966 } 967 } 968 969 if ( jj == count ) 970 break; 971 } 972 } 973 axis->mid_segments = ii; 974 } 975 #endif 976 977 Exit: 978 return error; 979 } 980 981 982 FT_LOCAL_DEF( void ) af_latin2_hints_link_segments(AF_GlyphHints hints,AF_Dimension dim)983 af_latin2_hints_link_segments( AF_GlyphHints hints, 984 AF_Dimension dim ) 985 { 986 AF_AxisHints axis = &hints->axis[dim]; 987 AF_Segment segments = axis->segments; 988 AF_Segment segment_limit = segments + axis->num_segments; 989 #ifdef AF_SORT_SEGMENTS 990 AF_Segment segment_mid = segments + axis->mid_segments; 991 #endif 992 FT_Pos len_threshold, len_score; 993 AF_Segment seg1, seg2; 994 995 996 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 997 if ( len_threshold == 0 ) 998 len_threshold = 1; 999 1000 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 ); 1001 1002 #ifdef AF_SORT_SEGMENTS 1003 for ( seg1 = segments; seg1 < segment_mid; seg1++ ) 1004 { 1005 if ( seg1->dir != axis->major_dir ) 1006 continue; 1007 1008 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ ) 1009 #else 1010 /* now compare each segment to the others */ 1011 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1012 { 1013 if ( seg1->dir != axis->major_dir ) 1014 continue; 1015 1016 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 1017 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos ) 1018 #endif 1019 { 1020 FT_Pos pos1 = seg1->pos; 1021 FT_Pos pos2 = seg2->pos; 1022 FT_Pos dist = pos2 - pos1; 1023 1024 1025 if ( dist < 0 ) 1026 continue; 1027 1028 { 1029 FT_Pos min = seg1->min_coord; 1030 FT_Pos max = seg1->max_coord; 1031 FT_Pos len, score; 1032 1033 1034 if ( min < seg2->min_coord ) 1035 min = seg2->min_coord; 1036 1037 if ( max > seg2->max_coord ) 1038 max = seg2->max_coord; 1039 1040 len = max - min; 1041 if ( len >= len_threshold ) 1042 { 1043 score = dist + len_score / len; 1044 if ( score < seg1->score ) 1045 { 1046 seg1->score = score; 1047 seg1->link = seg2; 1048 } 1049 1050 if ( score < seg2->score ) 1051 { 1052 seg2->score = score; 1053 seg2->link = seg1; 1054 } 1055 } 1056 } 1057 } 1058 } 1059 #if 0 1060 } 1061 #endif 1062 1063 /* now, compute the `serif' segments */ 1064 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 1065 { 1066 seg2 = seg1->link; 1067 1068 if ( seg2 ) 1069 { 1070 if ( seg2->link != seg1 ) 1071 { 1072 seg1->link = NULL; 1073 seg1->serif = seg2->link; 1074 } 1075 } 1076 } 1077 } 1078 1079 1080 FT_LOCAL_DEF( FT_Error ) af_latin2_hints_compute_edges(AF_GlyphHints hints,AF_Dimension dim)1081 af_latin2_hints_compute_edges( AF_GlyphHints hints, 1082 AF_Dimension dim ) 1083 { 1084 AF_AxisHints axis = &hints->axis[dim]; 1085 FT_Error error = FT_Err_Ok; 1086 FT_Memory memory = hints->memory; 1087 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim]; 1088 1089 AF_Segment segments = axis->segments; 1090 AF_Segment segment_limit = segments + axis->num_segments; 1091 AF_Segment seg; 1092 1093 AF_Direction up_dir; 1094 FT_Fixed scale; 1095 FT_Pos edge_distance_threshold; 1096 FT_Pos segment_length_threshold; 1097 1098 1099 axis->num_edges = 0; 1100 1101 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 1102 : hints->y_scale; 1103 1104 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP 1105 : AF_DIR_RIGHT; 1106 1107 /* 1108 * We want to ignore very small (mostly serif) segments, we do that 1109 * by ignoring those that whose length is less than a given fraction 1110 * of the standard width. If there is no standard width, we ignore 1111 * those that are less than a given size in pixels 1112 * 1113 * also, unlink serif segments that are linked to segments farther 1114 * than 50% of the standard width 1115 */ 1116 if ( dim == AF_DIMENSION_HORZ ) 1117 { 1118 if ( laxis->width_count > 0 ) 1119 segment_length_threshold = ( laxis->standard_width * 10 ) >> 4; 1120 else 1121 segment_length_threshold = FT_DivFix( 64, hints->y_scale ); 1122 } 1123 else 1124 segment_length_threshold = 0; 1125 1126 /*********************************************************************/ 1127 /* */ 1128 /* We will begin by generating a sorted table of edges for the */ 1129 /* current direction. To do so, we simply scan each segment and try */ 1130 /* to find an edge in our table that corresponds to its position. */ 1131 /* */ 1132 /* If no edge is found, we create and insert a new edge in the */ 1133 /* sorted table. Otherwise, we simply add the segment to the edge's */ 1134 /* list which will be processed in the second step to compute the */ 1135 /* edge's properties. */ 1136 /* */ 1137 /* Note that the edges table is sorted along the segment/edge */ 1138 /* position. */ 1139 /* */ 1140 /*********************************************************************/ 1141 1142 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1143 scale ); 1144 if ( edge_distance_threshold > 64 / 4 ) 1145 edge_distance_threshold = 64 / 4; 1146 1147 edge_distance_threshold = FT_DivFix( edge_distance_threshold, 1148 scale ); 1149 1150 for ( seg = segments; seg < segment_limit; seg++ ) 1151 { 1152 AF_Edge found = NULL; 1153 FT_Int ee; 1154 1155 1156 if ( seg->height < segment_length_threshold ) 1157 continue; 1158 1159 /* A special case for serif edges: If they are smaller than */ 1160 /* 1.5 pixels we ignore them. */ 1161 if ( seg->serif ) 1162 { 1163 FT_Pos dist = seg->serif->pos - seg->pos; 1164 1165 1166 if ( dist < 0 ) 1167 dist = -dist; 1168 1169 if ( dist >= laxis->standard_width >> 1 ) 1170 { 1171 /* unlink this serif, it is too distant from its reference stem */ 1172 seg->serif = NULL; 1173 } 1174 else if ( 2*seg->height < 3 * segment_length_threshold ) 1175 continue; 1176 } 1177 1178 /* look for an edge corresponding to the segment */ 1179 for ( ee = 0; ee < axis->num_edges; ee++ ) 1180 { 1181 AF_Edge edge = axis->edges + ee; 1182 FT_Pos dist; 1183 1184 1185 dist = seg->pos - edge->fpos; 1186 if ( dist < 0 ) 1187 dist = -dist; 1188 1189 if ( dist < edge_distance_threshold && edge->dir == seg->dir ) 1190 { 1191 found = edge; 1192 break; 1193 } 1194 } 1195 1196 if ( !found ) 1197 { 1198 AF_Edge edge; 1199 1200 1201 /* insert a new edge in the list and */ 1202 /* sort according to the position */ 1203 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, 0, 1204 memory, &edge ); 1205 if ( error ) 1206 goto Exit; 1207 1208 /* add the segment to the new edge's list */ 1209 FT_ZERO( edge ); 1210 1211 edge->first = seg; 1212 edge->last = seg; 1213 edge->dir = seg->dir; 1214 edge->fpos = seg->pos; 1215 edge->opos = FT_MulFix( seg->pos, scale ); 1216 edge->pos = edge->opos; 1217 seg->edge_next = seg; 1218 } 1219 else 1220 { 1221 /* if an edge was found, simply add the segment to the edge's */ 1222 /* list */ 1223 seg->edge_next = found->first; 1224 found->last->edge_next = seg; 1225 found->last = seg; 1226 } 1227 } 1228 1229 1230 /*********************************************************************/ 1231 /* */ 1232 /* Good, we will now compute each edge's properties according to */ 1233 /* segments found on its position. Basically, these are: */ 1234 /* */ 1235 /* - edge's main direction */ 1236 /* - stem edge, serif edge or both (which defaults to stem then) */ 1237 /* - rounded edge, straight or both (which defaults to straight) */ 1238 /* - link for edge */ 1239 /* */ 1240 /*********************************************************************/ 1241 1242 /* first of all, set the `edge' field in each segment -- this is */ 1243 /* required in order to compute edge links */ 1244 1245 /* 1246 * Note that removing this loop and setting the `edge' field of each 1247 * segment directly in the code above slows down execution speed for 1248 * some reasons on platforms like the Sun. 1249 */ 1250 { 1251 AF_Edge edges = axis->edges; 1252 AF_Edge edge_limit = edges + axis->num_edges; 1253 AF_Edge edge; 1254 1255 1256 for ( edge = edges; edge < edge_limit; edge++ ) 1257 { 1258 seg = edge->first; 1259 if ( seg ) 1260 do 1261 { 1262 seg->edge = edge; 1263 seg = seg->edge_next; 1264 1265 } while ( seg != edge->first ); 1266 } 1267 1268 /* now, compute each edge properties */ 1269 for ( edge = edges; edge < edge_limit; edge++ ) 1270 { 1271 FT_Int is_round = 0; /* does it contain round segments? */ 1272 FT_Int is_straight = 0; /* does it contain straight segments? */ 1273 #if 0 1274 FT_Pos ups = 0; /* number of upwards segments */ 1275 FT_Pos downs = 0; /* number of downwards segments */ 1276 #endif 1277 1278 1279 seg = edge->first; 1280 1281 do 1282 { 1283 FT_Bool is_serif; 1284 1285 1286 /* check for roundness of segment */ 1287 if ( seg->flags & AF_EDGE_ROUND ) 1288 is_round++; 1289 else 1290 is_straight++; 1291 1292 #if 0 1293 /* check for segment direction */ 1294 if ( seg->dir == up_dir ) 1295 ups += seg->max_coord-seg->min_coord; 1296 else 1297 downs += seg->max_coord-seg->min_coord; 1298 #endif 1299 1300 /* check for links -- if seg->serif is set, then seg->link must */ 1301 /* be ignored */ 1302 is_serif = (FT_Bool)( seg->serif && 1303 seg->serif->edge && 1304 seg->serif->edge != edge ); 1305 1306 if ( ( seg->link && seg->link->edge ) || is_serif ) 1307 { 1308 AF_Edge edge2; 1309 AF_Segment seg2; 1310 1311 1312 edge2 = edge->link; 1313 seg2 = seg->link; 1314 1315 if ( is_serif ) 1316 { 1317 seg2 = seg->serif; 1318 edge2 = edge->serif; 1319 } 1320 1321 if ( edge2 ) 1322 { 1323 FT_Pos edge_delta; 1324 FT_Pos seg_delta; 1325 1326 1327 edge_delta = edge->fpos - edge2->fpos; 1328 if ( edge_delta < 0 ) 1329 edge_delta = -edge_delta; 1330 1331 seg_delta = seg->pos - seg2->pos; 1332 if ( seg_delta < 0 ) 1333 seg_delta = -seg_delta; 1334 1335 if ( seg_delta < edge_delta ) 1336 edge2 = seg2->edge; 1337 } 1338 else 1339 edge2 = seg2->edge; 1340 1341 if ( is_serif ) 1342 { 1343 edge->serif = edge2; 1344 edge2->flags |= AF_EDGE_SERIF; 1345 } 1346 else 1347 edge->link = edge2; 1348 } 1349 1350 seg = seg->edge_next; 1351 1352 } while ( seg != edge->first ); 1353 1354 /* set the round/straight flags */ 1355 edge->flags = AF_EDGE_NORMAL; 1356 1357 if ( is_round > 0 && is_round >= is_straight ) 1358 edge->flags |= AF_EDGE_ROUND; 1359 1360 #if 0 1361 /* set the edge's main direction */ 1362 edge->dir = AF_DIR_NONE; 1363 1364 if ( ups > downs ) 1365 edge->dir = (FT_Char)up_dir; 1366 1367 else if ( ups < downs ) 1368 edge->dir = (FT_Char)-up_dir; 1369 1370 else if ( ups == downs ) 1371 edge->dir = 0; /* both up and down! */ 1372 #endif 1373 1374 /* gets rid of serifs if link is set */ 1375 /* XXX: This gets rid of many unpleasant artefacts! */ 1376 /* Example: the `c' in cour.pfa at size 13 */ 1377 1378 if ( edge->serif && edge->link ) 1379 edge->serif = NULL; 1380 } 1381 } 1382 1383 Exit: 1384 return error; 1385 } 1386 1387 1388 FT_LOCAL_DEF( FT_Error ) af_latin2_hints_detect_features(AF_GlyphHints hints,AF_Dimension dim)1389 af_latin2_hints_detect_features( AF_GlyphHints hints, 1390 AF_Dimension dim ) 1391 { 1392 FT_Error error; 1393 1394 1395 error = af_latin2_hints_compute_segments( hints, dim ); 1396 if ( !error ) 1397 { 1398 af_latin2_hints_link_segments( hints, dim ); 1399 1400 error = af_latin2_hints_compute_edges( hints, dim ); 1401 } 1402 return error; 1403 } 1404 1405 1406 static void af_latin2_hints_compute_blue_edges(AF_GlyphHints hints,AF_LatinMetrics metrics)1407 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints, 1408 AF_LatinMetrics metrics ) 1409 { 1410 AF_AxisHints axis = &hints->axis[AF_DIMENSION_VERT]; 1411 AF_Edge edge = axis->edges; 1412 AF_Edge edge_limit = edge + axis->num_edges; 1413 AF_LatinAxis latin = &metrics->axis[AF_DIMENSION_VERT]; 1414 FT_Fixed scale = latin->scale; 1415 FT_Pos best_dist0; /* initial threshold */ 1416 1417 1418 /* compute the initial threshold as a fraction of the EM size */ 1419 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale ); 1420 1421 if ( best_dist0 > 64 / 2 ) 1422 best_dist0 = 64 / 2; 1423 1424 /* compute which blue zones are active, i.e. have their scaled */ 1425 /* size < 3/4 pixels */ 1426 1427 /* for each horizontal edge search the blue zone which is closest */ 1428 for ( ; edge < edge_limit; edge++ ) 1429 { 1430 FT_Int bb; 1431 AF_Width best_blue = NULL; 1432 FT_Pos best_dist = best_dist0; 1433 1434 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 1435 { 1436 AF_LatinBlue blue = latin->blues + bb; 1437 FT_Bool is_top_blue, is_major_dir; 1438 1439 1440 /* skip inactive blue zones (i.e., those that are too small) */ 1441 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) ) 1442 continue; 1443 1444 /* if it is a top zone, check for right edges -- if it is a bottom */ 1445 /* zone, check for left edges */ 1446 /* */ 1447 /* of course, that's for TrueType */ 1448 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 ); 1449 is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); 1450 1451 /* if it is a top zone, the edge must be against the major */ 1452 /* direction; if it is a bottom zone, it must be in the major */ 1453 /* direction */ 1454 if ( is_top_blue ^ is_major_dir ) 1455 { 1456 FT_Pos dist; 1457 AF_Width compare; 1458 1459 1460 /* if it's a rounded edge, compare it to the overshoot position */ 1461 /* if it's a flat edge, compare it to the reference position */ 1462 if ( edge->flags & AF_EDGE_ROUND ) 1463 compare = &blue->shoot; 1464 else 1465 compare = &blue->ref; 1466 1467 dist = edge->fpos - compare->org; 1468 if ( dist < 0 ) 1469 dist = -dist; 1470 1471 dist = FT_MulFix( dist, scale ); 1472 if ( dist < best_dist ) 1473 { 1474 best_dist = dist; 1475 best_blue = compare; 1476 } 1477 1478 #if 0 1479 /* now, compare it to the overshoot position if the edge is */ 1480 /* rounded, and if the edge is over the reference position of a */ 1481 /* top zone, or under the reference position of a bottom zone */ 1482 if ( edge->flags & AF_EDGE_ROUND && dist != 0 ) 1483 { 1484 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org ); 1485 1486 1487 if ( is_top_blue ^ is_under_ref ) 1488 { 1489 blue = latin->blues + bb; 1490 dist = edge->fpos - blue->shoot.org; 1491 if ( dist < 0 ) 1492 dist = -dist; 1493 1494 dist = FT_MulFix( dist, scale ); 1495 if ( dist < best_dist ) 1496 { 1497 best_dist = dist; 1498 best_blue = & blue->shoot; 1499 } 1500 } 1501 } 1502 #endif 1503 } 1504 } 1505 1506 if ( best_blue ) 1507 edge->blue_edge = best_blue; 1508 } 1509 } 1510 1511 1512 static FT_Error af_latin2_hints_init(AF_GlyphHints hints,AF_LatinMetrics metrics)1513 af_latin2_hints_init( AF_GlyphHints hints, 1514 AF_LatinMetrics metrics ) 1515 { 1516 FT_Render_Mode mode; 1517 FT_UInt32 scaler_flags, other_flags; 1518 FT_Face face = metrics->root.scaler.face; 1519 1520 1521 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics ); 1522 1523 /* 1524 * correct x_scale and y_scale if needed, since they may have 1525 * been modified `af_latin2_metrics_scale_dim' above 1526 */ 1527 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1528 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1529 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1530 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1531 1532 /* compute flags depending on render mode, etc. */ 1533 mode = metrics->root.scaler.render_mode; 1534 1535 #if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */ 1536 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1537 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1538 #endif 1539 1540 scaler_flags = hints->scaler_flags; 1541 other_flags = 0; 1542 1543 /* 1544 * We snap the width of vertical stems for the monochrome and 1545 * horizontal LCD rendering targets only. 1546 */ 1547 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1548 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1549 1550 /* 1551 * We snap the width of horizontal stems for the monochrome and 1552 * vertical LCD rendering targets only. 1553 */ 1554 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1555 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1556 1557 /* 1558 * We adjust stems to full pixels only if we don't use the `light' mode. 1559 */ 1560 if ( mode != FT_RENDER_MODE_LIGHT ) 1561 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1562 1563 if ( mode == FT_RENDER_MODE_MONO ) 1564 other_flags |= AF_LATIN_HINTS_MONO; 1565 1566 /* 1567 * In `light' hinting mode we disable horizontal hinting completely. 1568 * We also do it if the face is italic. 1569 */ 1570 if ( mode == FT_RENDER_MODE_LIGHT || 1571 ( face->style_flags & FT_STYLE_FLAG_ITALIC ) != 0 ) 1572 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL; 1573 1574 #ifdef AF_CONFIG_OPTION_USE_WARPER 1575 /* get (global) warper flag */ 1576 if ( !metrics->root.globals->module->warping ) 1577 scaler_flags |= AF_SCALER_FLAG_NO_WARPER; 1578 #endif 1579 1580 hints->scaler_flags = scaler_flags; 1581 hints->other_flags = other_flags; 1582 1583 return 0; 1584 } 1585 1586 1587 /*************************************************************************/ 1588 /*************************************************************************/ 1589 /***** *****/ 1590 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/ 1591 /***** *****/ 1592 /*************************************************************************/ 1593 /*************************************************************************/ 1594 1595 /* snap a given width in scaled coordinates to one of the */ 1596 /* current standard widths */ 1597 1598 static FT_Pos af_latin2_snap_width(AF_Width widths,FT_UInt count,FT_Pos width)1599 af_latin2_snap_width( AF_Width widths, 1600 FT_UInt count, 1601 FT_Pos width ) 1602 { 1603 FT_UInt n; 1604 FT_Pos best = 64 + 32 + 2; 1605 FT_Pos reference = width; 1606 FT_Pos scaled; 1607 1608 1609 for ( n = 0; n < count; n++ ) 1610 { 1611 FT_Pos w; 1612 FT_Pos dist; 1613 1614 1615 w = widths[n].cur; 1616 dist = width - w; 1617 if ( dist < 0 ) 1618 dist = -dist; 1619 if ( dist < best ) 1620 { 1621 best = dist; 1622 reference = w; 1623 } 1624 } 1625 1626 scaled = FT_PIX_ROUND( reference ); 1627 1628 if ( width >= reference ) 1629 { 1630 if ( width < scaled + 48 ) 1631 width = reference; 1632 } 1633 else 1634 { 1635 if ( width > scaled - 48 ) 1636 width = reference; 1637 } 1638 1639 return width; 1640 } 1641 1642 1643 /* compute the snapped width of a given stem */ 1644 1645 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)1646 af_latin2_compute_stem_width( AF_GlyphHints hints, 1647 AF_Dimension dim, 1648 FT_Pos width, 1649 FT_UInt base_flags, 1650 FT_UInt stem_flags ) 1651 { 1652 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics; 1653 AF_LatinAxis axis = & metrics->axis[dim]; 1654 FT_Pos dist = width; 1655 FT_Int sign = 0; 1656 FT_Int vertical = ( dim == AF_DIMENSION_VERT ); 1657 1658 FT_UNUSED( base_flags ); 1659 1660 1661 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) || 1662 axis->extra_light ) 1663 return width; 1664 1665 if ( dist < 0 ) 1666 { 1667 dist = -width; 1668 sign = 1; 1669 } 1670 1671 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1672 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1673 { 1674 /* smooth hinting process: very lightly quantize the stem width */ 1675 1676 /* leave the widths of serifs alone */ 1677 1678 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) ) 1679 goto Done_Width; 1680 1681 #if 0 1682 else if ( ( base_flags & AF_EDGE_ROUND ) ) 1683 { 1684 if ( dist < 80 ) 1685 dist = 64; 1686 } 1687 else if ( dist < 56 ) 1688 dist = 56; 1689 #endif 1690 if ( axis->width_count > 0 ) 1691 { 1692 FT_Pos delta; 1693 1694 1695 /* compare to standard width */ 1696 if ( axis->width_count > 0 ) 1697 { 1698 delta = dist - axis->widths[0].cur; 1699 1700 if ( delta < 0 ) 1701 delta = -delta; 1702 1703 if ( delta < 40 ) 1704 { 1705 dist = axis->widths[0].cur; 1706 if ( dist < 48 ) 1707 dist = 48; 1708 1709 goto Done_Width; 1710 } 1711 } 1712 1713 if ( dist < 3 * 64 ) 1714 { 1715 delta = dist & 63; 1716 dist &= -64; 1717 1718 if ( delta < 10 ) 1719 dist += delta; 1720 1721 else if ( delta < 32 ) 1722 dist += 10; 1723 1724 else if ( delta < 54 ) 1725 dist += 54; 1726 1727 else 1728 dist += delta; 1729 } 1730 else 1731 dist = ( dist + 32 ) & ~63; 1732 } 1733 } 1734 else 1735 { 1736 /* strong hinting process: snap the stem width to integer pixels */ 1737 FT_Pos org_dist = dist; 1738 1739 1740 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist ); 1741 1742 if ( vertical ) 1743 { 1744 /* in the case of vertical hinting, always round */ 1745 /* the stem heights to integer pixels */ 1746 1747 if ( dist >= 64 ) 1748 dist = ( dist + 16 ) & ~63; 1749 else 1750 dist = 64; 1751 } 1752 else 1753 { 1754 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1755 { 1756 /* monochrome horizontal hinting: snap widths to integer pixels */ 1757 /* with a different threshold */ 1758 1759 if ( dist < 64 ) 1760 dist = 64; 1761 else 1762 dist = ( dist + 32 ) & ~63; 1763 } 1764 else 1765 { 1766 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1767 /* approach: we strengthen small stems, round stems whose size */ 1768 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1769 1770 if ( dist < 48 ) 1771 dist = ( dist + 64 ) >> 1; 1772 1773 else if ( dist < 128 ) 1774 { 1775 /* We only round to an integer width if the corresponding */ 1776 /* distortion is less than 1/4 pixel. Otherwise this */ 1777 /* makes everything worse since the diagonals, which are */ 1778 /* not hinted, appear a lot bolder or thinner than the */ 1779 /* vertical stems. */ 1780 1781 FT_Int delta; 1782 1783 1784 dist = ( dist + 22 ) & ~63; 1785 delta = dist - org_dist; 1786 if ( delta < 0 ) 1787 delta = -delta; 1788 1789 if ( delta >= 16 ) 1790 { 1791 dist = org_dist; 1792 if ( dist < 48 ) 1793 dist = ( dist + 64 ) >> 1; 1794 } 1795 } 1796 else 1797 /* round otherwise to prevent color fringes in LCD mode */ 1798 dist = ( dist + 32 ) & ~63; 1799 } 1800 } 1801 } 1802 1803 Done_Width: 1804 if ( sign ) 1805 dist = -dist; 1806 1807 return dist; 1808 } 1809 1810 1811 /* align one stem edge relative to the previous stem edge */ 1812 1813 static void af_latin2_align_linked_edge(AF_GlyphHints hints,AF_Dimension dim,AF_Edge base_edge,AF_Edge stem_edge)1814 af_latin2_align_linked_edge( AF_GlyphHints hints, 1815 AF_Dimension dim, 1816 AF_Edge base_edge, 1817 AF_Edge stem_edge ) 1818 { 1819 FT_Pos dist = stem_edge->opos - base_edge->opos; 1820 1821 FT_Pos fitted_width = af_latin2_compute_stem_width( hints, dim, dist, 1822 base_edge->flags, 1823 stem_edge->flags ); 1824 1825 1826 stem_edge->pos = base_edge->pos + fitted_width; 1827 1828 FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), " 1829 "dist was %.2f, now %.2f\n", 1830 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0, 1831 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 )); 1832 } 1833 1834 1835 static void af_latin2_align_serif_edge(AF_GlyphHints hints,AF_Edge base,AF_Edge serif)1836 af_latin2_align_serif_edge( AF_GlyphHints hints, 1837 AF_Edge base, 1838 AF_Edge serif ) 1839 { 1840 FT_UNUSED( hints ); 1841 1842 serif->pos = base->pos + ( serif->opos - base->opos ); 1843 } 1844 1845 1846 /*************************************************************************/ 1847 /*************************************************************************/ 1848 /*************************************************************************/ 1849 /**** ****/ 1850 /**** E D G E H I N T I N G ****/ 1851 /**** ****/ 1852 /*************************************************************************/ 1853 /*************************************************************************/ 1854 /*************************************************************************/ 1855 1856 1857 static void af_latin2_hint_edges(AF_GlyphHints hints,AF_Dimension dim)1858 af_latin2_hint_edges( AF_GlyphHints hints, 1859 AF_Dimension dim ) 1860 { 1861 AF_AxisHints axis = &hints->axis[dim]; 1862 AF_Edge edges = axis->edges; 1863 AF_Edge edge_limit = edges + axis->num_edges; 1864 AF_Edge edge; 1865 AF_Edge anchor = NULL; 1866 FT_Int has_serifs = 0; 1867 FT_Pos anchor_drift = 0; 1868 1869 1870 1871 FT_TRACE5(( "==== hinting %s edges =====\n", 1872 dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" )); 1873 1874 /* we begin by aligning all stems relative to the blue zone */ 1875 /* if needed -- that's only for horizontal edges */ 1876 1877 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) ) 1878 { 1879 for ( edge = edges; edge < edge_limit; edge++ ) 1880 { 1881 AF_Width blue; 1882 AF_Edge edge1, edge2; 1883 1884 1885 if ( edge->flags & AF_EDGE_DONE ) 1886 continue; 1887 1888 blue = edge->blue_edge; 1889 edge1 = NULL; 1890 edge2 = edge->link; 1891 1892 if ( blue ) 1893 { 1894 edge1 = edge; 1895 } 1896 else if ( edge2 && edge2->blue_edge ) 1897 { 1898 blue = edge2->blue_edge; 1899 edge1 = edge2; 1900 edge2 = edge; 1901 } 1902 1903 if ( !edge1 ) 1904 continue; 1905 1906 FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), " 1907 "was (%.2f)\n", 1908 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0, 1909 edge1->pos / 64.0 )); 1910 1911 edge1->pos = blue->fit; 1912 edge1->flags |= AF_EDGE_DONE; 1913 1914 if ( edge2 && !edge2->blue_edge ) 1915 { 1916 af_latin2_align_linked_edge( hints, dim, edge1, edge2 ); 1917 edge2->flags |= AF_EDGE_DONE; 1918 } 1919 1920 if ( !anchor ) 1921 { 1922 anchor = edge; 1923 1924 anchor_drift = ( anchor->pos - anchor->opos ); 1925 if ( edge2 ) 1926 anchor_drift = ( anchor_drift + 1927 ( edge2->pos - edge2->opos ) ) >> 1; 1928 } 1929 } 1930 } 1931 1932 /* now we will align all stem edges, trying to maintain the */ 1933 /* relative order of stems in the glyph */ 1934 for ( edge = edges; edge < edge_limit; edge++ ) 1935 { 1936 AF_Edge edge2; 1937 1938 1939 if ( edge->flags & AF_EDGE_DONE ) 1940 continue; 1941 1942 /* skip all non-stem edges */ 1943 edge2 = edge->link; 1944 if ( !edge2 ) 1945 { 1946 has_serifs++; 1947 continue; 1948 } 1949 1950 /* now align the stem */ 1951 1952 /* this should not happen, but it's better to be safe */ 1953 if ( edge2->blue_edge ) 1954 { 1955 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1956 1957 af_latin2_align_linked_edge( hints, dim, edge2, edge ); 1958 edge->flags |= AF_EDGE_DONE; 1959 continue; 1960 } 1961 1962 if ( !anchor ) 1963 { 1964 FT_Pos org_len, org_center, cur_len; 1965 FT_Pos cur_pos1, error1, error2, u_off, d_off; 1966 1967 1968 org_len = edge2->opos - edge->opos; 1969 cur_len = af_latin2_compute_stem_width( hints, dim, org_len, 1970 edge->flags, 1971 edge2->flags ); 1972 if ( cur_len <= 64 ) 1973 u_off = d_off = 32; 1974 else 1975 { 1976 u_off = 38; 1977 d_off = 26; 1978 } 1979 1980 if ( cur_len < 96 ) 1981 { 1982 org_center = edge->opos + ( org_len >> 1 ); 1983 1984 cur_pos1 = FT_PIX_ROUND( org_center ); 1985 1986 error1 = org_center - ( cur_pos1 - u_off ); 1987 if ( error1 < 0 ) 1988 error1 = -error1; 1989 1990 error2 = org_center - ( cur_pos1 + d_off ); 1991 if ( error2 < 0 ) 1992 error2 = -error2; 1993 1994 if ( error1 < error2 ) 1995 cur_pos1 -= u_off; 1996 else 1997 cur_pos1 += d_off; 1998 1999 edge->pos = cur_pos1 - cur_len / 2; 2000 edge2->pos = edge->pos + cur_len; 2001 } 2002 else 2003 edge->pos = FT_PIX_ROUND( edge->opos ); 2004 2005 FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)" 2006 " snapped to (%.2f) (%.2f)\n", 2007 edge-edges, edge->opos / 64.0, 2008 edge2-edges, edge2->opos / 64.0, 2009 edge->pos / 64.0, edge2->pos / 64.0 )); 2010 anchor = edge; 2011 2012 edge->flags |= AF_EDGE_DONE; 2013 2014 af_latin2_align_linked_edge( hints, dim, edge, edge2 ); 2015 2016 edge2->flags |= AF_EDGE_DONE; 2017 2018 anchor_drift = ( ( anchor->pos - anchor->opos ) + 2019 ( edge2->pos - edge2->opos ) ) >> 1; 2020 2021 FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 )); 2022 } 2023 else 2024 { 2025 FT_Pos org_pos, org_len, org_center, cur_center, cur_len; 2026 FT_Pos org_left, org_right; 2027 2028 2029 org_pos = edge->opos + anchor_drift; 2030 org_len = edge2->opos - edge->opos; 2031 org_center = org_pos + ( org_len >> 1 ); 2032 2033 cur_len = af_latin2_compute_stem_width( hints, dim, org_len, 2034 edge->flags, 2035 edge2->flags ); 2036 2037 org_left = org_pos + ( ( org_len - cur_len ) >> 1 ); 2038 org_right = org_pos + ( ( org_len + cur_len ) >> 1 ); 2039 2040 FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ", 2041 org_left / 64.0, org_right / 64.0 )); 2042 cur_center = org_center; 2043 2044 if ( edge2->flags & AF_EDGE_DONE ) 2045 { 2046 FT_TRACE5(( "\n" )); 2047 edge->pos = edge2->pos - cur_len; 2048 } 2049 else 2050 { 2051 /* we want to compare several displacement, and choose 2052 * the one that increases fitness while minimizing 2053 * distortion as well 2054 */ 2055 FT_Pos displacements[6], scores[6], org, fit, delta; 2056 FT_UInt count = 0; 2057 2058 /* note: don't even try to fit tiny stems */ 2059 if ( cur_len < 32 ) 2060 { 2061 FT_TRACE5(( "tiny stem\n" )); 2062 goto AlignStem; 2063 } 2064 2065 /* if the span is within a single pixel, don't touch it */ 2066 if ( FT_PIX_FLOOR( org_left ) == FT_PIX_CEIL( org_right ) ) 2067 { 2068 FT_TRACE5(( "single pixel stem\n" )); 2069 goto AlignStem; 2070 } 2071 2072 if ( cur_len <= 96 ) 2073 { 2074 /* we want to avoid the absolute worst case which is 2075 * when the left and right edges of the span each represent 2076 * about 50% of the gray. we'd better want to change this 2077 * to 25/75%, since this is much more pleasant to the eye with 2078 * very acceptable distortion 2079 */ 2080 FT_Pos frac_left = org_left & 63; 2081 FT_Pos frac_right = org_right & 63; 2082 2083 if ( frac_left >= 22 && frac_left <= 42 && 2084 frac_right >= 22 && frac_right <= 42 ) 2085 { 2086 org = frac_left; 2087 fit = ( org <= 32 ) ? 16 : 48; 2088 delta = FT_ABS( fit - org ); 2089 displacements[count] = fit - org; 2090 scores[count++] = delta; 2091 FT_TRACE5(( "dispA=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2092 2093 org = frac_right; 2094 fit = ( org <= 32 ) ? 16 : 48; 2095 delta = FT_ABS( fit - org ); 2096 displacements[count] = fit - org; 2097 scores[count++] = delta; 2098 FT_TRACE5(( "dispB=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2099 } 2100 } 2101 2102 /* snapping the left edge to the grid */ 2103 org = org_left; 2104 fit = FT_PIX_ROUND( org ); 2105 delta = FT_ABS( fit - org ); 2106 displacements[count] = fit - org; 2107 scores[count++] = delta; 2108 FT_TRACE5(( "dispC=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2109 2110 /* snapping the right edge to the grid */ 2111 org = org_right; 2112 fit = FT_PIX_ROUND( org ); 2113 delta = FT_ABS( fit - org ); 2114 displacements[count] = fit - org; 2115 scores[count++] = delta; 2116 FT_TRACE5(( "dispD=%.2f (%d) ", ( fit - org ) / 64.0, delta )); 2117 2118 /* now find the best displacement */ 2119 { 2120 FT_Pos best_score = scores[0]; 2121 FT_Pos best_disp = displacements[0]; 2122 FT_UInt nn; 2123 2124 for ( nn = 1; nn < count; nn++ ) 2125 { 2126 if ( scores[nn] < best_score ) 2127 { 2128 best_score = scores[nn]; 2129 best_disp = displacements[nn]; 2130 } 2131 } 2132 2133 cur_center = org_center + best_disp; 2134 } 2135 FT_TRACE5(( "\n" )); 2136 } 2137 2138 AlignStem: 2139 edge->pos = cur_center - ( cur_len >> 1 ); 2140 edge2->pos = edge->pos + cur_len; 2141 2142 FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)" 2143 " snapped to (%.2f) and (%.2f)," 2144 " org_len=%.2f cur_len=%.2f\n", 2145 edge-edges, edge->opos / 64.0, 2146 edge2-edges, edge2->opos / 64.0, 2147 edge->pos / 64.0, edge2->pos / 64.0, 2148 org_len / 64.0, cur_len / 64.0 )); 2149 2150 edge->flags |= AF_EDGE_DONE; 2151 edge2->flags |= AF_EDGE_DONE; 2152 2153 if ( edge > edges && edge->pos < edge[-1].pos ) 2154 { 2155 FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n", 2156 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 )); 2157 edge->pos = edge[-1].pos; 2158 } 2159 } 2160 } 2161 2162 /* make sure that lowercase m's maintain their symmetry */ 2163 2164 /* In general, lowercase m's have six vertical edges if they are sans */ 2165 /* serif, or twelve if they are with serifs. This implementation is */ 2166 /* based on that assumption, and seems to work very well with most */ 2167 /* faces. However, if for a certain face this assumption is not */ 2168 /* true, the m is just rendered like before. In addition, any stem */ 2169 /* correction will only be applied to symmetrical glyphs (even if the */ 2170 /* glyph is not an m), so the potential for unwanted distortion is */ 2171 /* relatively low. */ 2172 2173 /* We don't handle horizontal edges since we can't easily assure that */ 2174 /* the third (lowest) stem aligns with the base line; it might end up */ 2175 /* one pixel higher or lower. */ 2176 2177 #if 0 2178 { 2179 FT_Int n_edges = edge_limit - edges; 2180 2181 2182 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 2183 { 2184 AF_Edge edge1, edge2, edge3; 2185 FT_Pos dist1, dist2, span, delta; 2186 2187 2188 if ( n_edges == 6 ) 2189 { 2190 edge1 = edges; 2191 edge2 = edges + 2; 2192 edge3 = edges + 4; 2193 } 2194 else 2195 { 2196 edge1 = edges + 1; 2197 edge2 = edges + 5; 2198 edge3 = edges + 9; 2199 } 2200 2201 dist1 = edge2->opos - edge1->opos; 2202 dist2 = edge3->opos - edge2->opos; 2203 2204 span = dist1 - dist2; 2205 if ( span < 0 ) 2206 span = -span; 2207 2208 if ( span < 8 ) 2209 { 2210 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 2211 edge3->pos -= delta; 2212 if ( edge3->link ) 2213 edge3->link->pos -= delta; 2214 2215 /* move the serifs along with the stem */ 2216 if ( n_edges == 12 ) 2217 { 2218 ( edges + 8 )->pos -= delta; 2219 ( edges + 11 )->pos -= delta; 2220 } 2221 2222 edge3->flags |= AF_EDGE_DONE; 2223 if ( edge3->link ) 2224 edge3->link->flags |= AF_EDGE_DONE; 2225 } 2226 } 2227 } 2228 #endif 2229 2230 if ( has_serifs || !anchor ) 2231 { 2232 /* 2233 * now hint the remaining edges (serifs and single) in order 2234 * to complete our processing 2235 */ 2236 for ( edge = edges; edge < edge_limit; edge++ ) 2237 { 2238 FT_Pos delta; 2239 2240 2241 if ( edge->flags & AF_EDGE_DONE ) 2242 continue; 2243 2244 delta = 1000; 2245 2246 if ( edge->serif ) 2247 { 2248 delta = edge->serif->opos - edge->opos; 2249 if ( delta < 0 ) 2250 delta = -delta; 2251 } 2252 2253 if ( delta < 64 + 16 ) 2254 { 2255 af_latin2_align_serif_edge( hints, edge->serif, edge ); 2256 FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)" 2257 " aligned to (%.2f)\n", 2258 edge-edges, edge->opos / 64.0, 2259 edge->serif - edges, edge->serif->opos / 64.0, 2260 edge->pos / 64.0 )); 2261 } 2262 else if ( !anchor ) 2263 { 2264 FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)" 2265 " snapped to (%.2f)\n", 2266 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2267 edge->pos = FT_PIX_ROUND( edge->opos ); 2268 anchor = edge; 2269 } 2270 else 2271 { 2272 AF_Edge before, after; 2273 2274 2275 for ( before = edge - 1; before >= edges; before-- ) 2276 if ( before->flags & AF_EDGE_DONE ) 2277 break; 2278 2279 for ( after = edge + 1; after < edge_limit; after++ ) 2280 if ( after->flags & AF_EDGE_DONE ) 2281 break; 2282 2283 if ( before >= edges && before < edge && 2284 after < edge_limit && after > edge ) 2285 { 2286 if ( after->opos == before->opos ) 2287 edge->pos = before->pos; 2288 else 2289 edge->pos = before->pos + 2290 FT_MulDiv( edge->opos - before->opos, 2291 after->pos - before->pos, 2292 after->opos - before->opos ); 2293 FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)" 2294 " from %d (opos=%.2f)\n", 2295 edge-edges, edge->opos / 64.0, edge->pos / 64.0, 2296 before - edges, before->opos / 64.0 )); 2297 } 2298 else 2299 { 2300 edge->pos = anchor->pos + 2301 ( ( edge->opos - anchor->opos + 16 ) & ~31 ); 2302 2303 FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)" 2304 " snapped to (%.2f)\n", 2305 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2306 } 2307 } 2308 2309 edge->flags |= AF_EDGE_DONE; 2310 2311 if ( edge > edges && edge->pos < edge[-1].pos ) 2312 edge->pos = edge[-1].pos; 2313 2314 if ( edge + 1 < edge_limit && 2315 edge[1].flags & AF_EDGE_DONE && 2316 edge->pos > edge[1].pos ) 2317 edge->pos = edge[1].pos; 2318 } 2319 } 2320 } 2321 2322 2323 static FT_Error af_latin2_hints_apply(FT_UInt glyph_index,AF_GlyphHints hints,FT_Outline * outline,AF_LatinMetrics metrics)2324 af_latin2_hints_apply( FT_UInt glyph_index, 2325 AF_GlyphHints hints, 2326 FT_Outline* outline, 2327 AF_LatinMetrics metrics ) 2328 { 2329 FT_Error error; 2330 int dim; 2331 2332 FT_UNUSED( glyph_index ); 2333 2334 2335 error = af_glyph_hints_reload( hints, outline ); 2336 if ( error ) 2337 goto Exit; 2338 2339 /* analyze glyph outline */ 2340 #ifdef AF_CONFIG_OPTION_USE_WARPER 2341 if ( ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT && 2342 AF_HINTS_DO_WARP( hints ) ) || 2343 AF_HINTS_DO_HORIZONTAL( hints ) ) 2344 #else 2345 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2346 #endif 2347 { 2348 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2349 if ( error ) 2350 goto Exit; 2351 } 2352 2353 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2354 { 2355 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT ); 2356 if ( error ) 2357 goto Exit; 2358 2359 af_latin2_hints_compute_blue_edges( hints, metrics ); 2360 } 2361 2362 /* grid-fit the outline */ 2363 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2364 { 2365 #ifdef AF_CONFIG_OPTION_USE_WARPER 2366 if ( dim == AF_DIMENSION_HORZ && 2367 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT && 2368 AF_HINTS_DO_WARP( hints ) ) 2369 { 2370 AF_WarperRec warper; 2371 FT_Fixed scale; 2372 FT_Pos delta; 2373 2374 2375 af_warper_compute( &warper, hints, dim, &scale, &delta ); 2376 af_glyph_hints_scale_dim( hints, dim, scale, delta ); 2377 continue; 2378 } 2379 #endif /* AF_CONFIG_OPTION_USE_WARPER */ 2380 2381 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2382 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2383 { 2384 af_latin2_hint_edges( hints, (AF_Dimension)dim ); 2385 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim ); 2386 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2387 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2388 } 2389 } 2390 af_glyph_hints_save( hints, outline ); 2391 2392 Exit: 2393 return error; 2394 } 2395 2396 2397 /*************************************************************************/ 2398 /*************************************************************************/ 2399 /***** *****/ 2400 /***** L A T I N S C R I P T C L A S S *****/ 2401 /***** *****/ 2402 /*************************************************************************/ 2403 /*************************************************************************/ 2404 2405 2406 AF_DEFINE_WRITING_SYSTEM_CLASS( 2407 af_latin2_writing_system_class, 2408 2409 AF_WRITING_SYSTEM_LATIN2, 2410 2411 sizeof ( AF_LatinMetricsRec ), 2412 2413 (AF_WritingSystem_InitMetricsFunc) af_latin2_metrics_init, /* style_metrics_init */ 2414 (AF_WritingSystem_ScaleMetricsFunc)af_latin2_metrics_scale, /* style_metrics_scale */ 2415 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */ 2416 (AF_WritingSystem_GetStdWidthsFunc)af_latin2_get_standard_widths, /* style_metrics_getstdw */ 2417 2418 (AF_WritingSystem_InitHintsFunc) af_latin2_hints_init, /* style_hints_init */ 2419 (AF_WritingSystem_ApplyHintsFunc) af_latin2_hints_apply /* style_hints_apply */ 2420 ) 2421 2422 2423 /* END */ 2424