1 /***************************************************************************/ 2 /* */ 3 /* aflatin.c */ 4 /* */ 5 /* Auto-fitter hinting routines for latin script (body). */ 6 /* */ 7 /* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 19 #include <ft2build.h> 20 #include FT_ADVANCES_H 21 22 #include "aflatin.h" 23 #include "aferrors.h" 24 25 26 #ifdef AF_USE_WARPER 27 #include "afwarp.h" 28 #endif 29 30 31 /*************************************************************************/ 32 /*************************************************************************/ 33 /***** *****/ 34 /***** L A T I N G L O B A L M E T R I C S *****/ 35 /***** *****/ 36 /*************************************************************************/ 37 /*************************************************************************/ 38 39 FT_LOCAL_DEF( void ) 40 af_latin_metrics_init_widths( AF_LatinMetrics metrics, 41 FT_Face face, 42 FT_ULong charcode ) 43 { 44 /* scan the array of segments in each direction */ 45 AF_GlyphHintsRec hints[1]; 46 47 48 af_glyph_hints_init( hints, face->memory ); 49 50 metrics->axis[AF_DIMENSION_HORZ].width_count = 0; 51 metrics->axis[AF_DIMENSION_VERT].width_count = 0; 52 53 { 54 FT_Error error; 55 FT_UInt glyph_index; 56 int dim; 57 AF_LatinMetricsRec dummy[1]; 58 AF_Scaler scaler = &dummy->root.scaler; 59 60 61 glyph_index = FT_Get_Char_Index( face, charcode ); 62 if ( glyph_index == 0 ) 63 goto Exit; 64 65 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 66 if ( error || face->glyph->outline.n_points <= 0 ) 67 goto Exit; 68 69 FT_ZERO( dummy ); 70 71 dummy->units_per_em = metrics->units_per_em; 72 scaler->x_scale = scaler->y_scale = 0x10000L; 73 scaler->x_delta = scaler->y_delta = 0; 74 scaler->face = face; 75 scaler->render_mode = FT_RENDER_MODE_NORMAL; 76 scaler->flags = 0; 77 78 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)dummy ); 79 80 error = af_glyph_hints_reload( hints, &face->glyph->outline, 0 ); 81 if ( error ) 82 goto Exit; 83 84 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 85 { 86 AF_LatinAxis axis = &metrics->axis[dim]; 87 AF_AxisHints axhints = &hints->axis[dim]; 88 AF_Segment seg, limit, link; 89 FT_UInt num_widths = 0; 90 91 92 error = af_latin_hints_compute_segments( hints, 93 (AF_Dimension)dim ); 94 if ( error ) 95 goto Exit; 96 97 af_latin_hints_link_segments( hints, 98 (AF_Dimension)dim ); 99 100 seg = axhints->segments; 101 limit = seg + axhints->num_segments; 102 103 for ( ; seg < limit; seg++ ) 104 { 105 link = seg->link; 106 107 /* we only consider stem segments there! */ 108 if ( link && link->link == seg && link > seg ) 109 { 110 FT_Pos dist; 111 112 113 dist = seg->pos - link->pos; 114 if ( dist < 0 ) 115 dist = -dist; 116 117 if ( num_widths < AF_LATIN_MAX_WIDTHS ) 118 axis->widths[ num_widths++ ].org = dist; 119 } 120 } 121 122 af_sort_widths( num_widths, axis->widths ); 123 axis->width_count = num_widths; 124 } 125 126 Exit: 127 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 128 { 129 AF_LatinAxis axis = &metrics->axis[dim]; 130 FT_Pos stdw; 131 132 133 stdw = ( axis->width_count > 0 ) 134 ? axis->widths[0].org 135 : AF_LATIN_CONSTANT( metrics, 50 ); 136 137 /* let's try 20% of the smallest width */ 138 axis->edge_distance_threshold = stdw / 5; 139 axis->standard_width = stdw; 140 axis->extra_light = 0; 141 } 142 } 143 144 af_glyph_hints_done( hints ); 145 } 146 147 148 149 #define AF_LATIN_MAX_TEST_CHARACTERS 12 150 151 152 static const char af_latin_blue_chars[AF_LATIN_MAX_BLUES] 153 [AF_LATIN_MAX_TEST_CHARACTERS + 1] = 154 { 155 "THEZOCQS", 156 "HEZLOCUS", 157 "fijkdbh", 158 "xzroesc", 159 "xzroesc", 160 "pqgjy" 161 }; 162 163 164 static void 165 af_latin_metrics_init_blues( AF_LatinMetrics metrics, 166 FT_Face face ) 167 { 168 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS]; 169 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS]; 170 FT_Int num_flats; 171 FT_Int num_rounds; 172 FT_Int bb; 173 AF_LatinBlue blue; 174 FT_Error error; 175 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT]; 176 FT_GlyphSlot glyph = face->glyph; 177 178 179 /* we compute the blues simply by loading each character from the */ 180 /* 'af_latin_blue_chars[blues]' string, then compute its top-most or */ 181 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */ 182 183 AF_LOG(( "blue zones computation\n" )); 184 AF_LOG(( "------------------------------------------------\n" )); 185 186 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 187 { 188 const char* p = af_latin_blue_chars[bb]; 189 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS; 190 FT_Pos* blue_ref; 191 FT_Pos* blue_shoot; 192 193 194 AF_LOG(( "blue %3d: ", bb )); 195 196 num_flats = 0; 197 num_rounds = 0; 198 199 for ( ; p < limit && *p; p++ ) 200 { 201 FT_UInt glyph_index; 202 FT_Pos best_y; /* same as points.y */ 203 FT_Int best_point, best_first, best_last; 204 FT_Vector* points; 205 FT_Bool round = 0; 206 207 208 AF_LOG(( "'%c'", *p )); 209 210 /* load the character in the face -- skip unknown or empty ones */ 211 glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p ); 212 if ( glyph_index == 0 ) 213 continue; 214 215 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); 216 if ( error || glyph->outline.n_points <= 0 ) 217 continue; 218 219 /* now compute min or max point indices and coordinates */ 220 points = glyph->outline.points; 221 best_point = -1; 222 best_y = 0; /* make compiler happy */ 223 best_first = 0; /* ditto */ 224 best_last = 0; /* ditto */ 225 226 { 227 FT_Int nn; 228 FT_Int first = 0; 229 FT_Int last = -1; 230 231 232 for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ ) 233 { 234 FT_Int old_best_point = best_point; 235 FT_Int pp; 236 237 238 last = glyph->outline.contours[nn]; 239 240 /* Avoid single-point contours since they are never rasterized. */ 241 /* In some fonts, they correspond to mark attachment points */ 242 /* which are way outside of the glyph's real outline. */ 243 if ( last <= first ) 244 continue; 245 246 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 247 { 248 for ( pp = first; pp <= last; pp++ ) 249 if ( best_point < 0 || points[pp].y > best_y ) 250 { 251 best_point = pp; 252 best_y = points[pp].y; 253 } 254 } 255 else 256 { 257 for ( pp = first; pp <= last; pp++ ) 258 if ( best_point < 0 || points[pp].y < best_y ) 259 { 260 best_point = pp; 261 best_y = points[pp].y; 262 } 263 } 264 265 if ( best_point != old_best_point ) 266 { 267 best_first = first; 268 best_last = last; 269 } 270 } 271 AF_LOG(( "%5d", best_y )); 272 } 273 274 /* now check whether the point belongs to a straight or round */ 275 /* segment; we first need to find in which contour the extremum */ 276 /* lies, then inspect its previous and next points */ 277 if ( best_point >= 0 ) 278 { 279 FT_Int prev, next; 280 FT_Pos dist; 281 282 283 /* now look for the previous and next points that are not on the */ 284 /* same Y coordinate. Threshold the `closeness'... */ 285 prev = best_point; 286 next = prev; 287 288 do 289 { 290 if ( prev > best_first ) 291 prev--; 292 else 293 prev = best_last; 294 295 dist = points[prev].y - best_y; 296 if ( dist < -5 || dist > 5 ) 297 break; 298 299 } while ( prev != best_point ); 300 301 do 302 { 303 if ( next < best_last ) 304 next++; 305 else 306 next = best_first; 307 308 dist = points[next].y - best_y; 309 if ( dist < -5 || dist > 5 ) 310 break; 311 312 } while ( next != best_point ); 313 314 /* now, set the `round' flag depending on the segment's kind */ 315 round = FT_BOOL( 316 FT_CURVE_TAG( glyph->outline.tags[prev] ) != FT_CURVE_TAG_ON || 317 FT_CURVE_TAG( glyph->outline.tags[next] ) != FT_CURVE_TAG_ON ); 318 319 AF_LOG(( "%c ", round ? 'r' : 'f' )); 320 } 321 322 if ( round ) 323 rounds[num_rounds++] = best_y; 324 else 325 flats[num_flats++] = best_y; 326 } 327 328 AF_LOG(( "\n" )); 329 330 if ( num_flats == 0 && num_rounds == 0 ) 331 { 332 /* 333 * we couldn't find a single glyph to compute this blue zone, 334 * we will simply ignore it then 335 */ 336 AF_LOG(( "empty\n" )); 337 continue; 338 } 339 340 /* we have computed the contents of the `rounds' and `flats' tables, */ 341 /* now determine the reference and overshoot position of the blue -- */ 342 /* we simply take the median value after a simple sort */ 343 af_sort_pos( num_rounds, rounds ); 344 af_sort_pos( num_flats, flats ); 345 346 blue = & axis->blues[axis->blue_count]; 347 blue_ref = & blue->ref.org; 348 blue_shoot = & blue->shoot.org; 349 350 axis->blue_count++; 351 352 if ( num_flats == 0 ) 353 { 354 *blue_ref = 355 *blue_shoot = rounds[num_rounds / 2]; 356 } 357 else if ( num_rounds == 0 ) 358 { 359 *blue_ref = 360 *blue_shoot = flats[num_flats / 2]; 361 } 362 else 363 { 364 *blue_ref = flats[num_flats / 2]; 365 *blue_shoot = rounds[num_rounds / 2]; 366 } 367 368 /* there are sometimes problems: if the overshoot position of top */ 369 /* zones is under its reference position, or the opposite for bottom */ 370 /* zones. We must thus check everything there and correct the errors */ 371 if ( *blue_shoot != *blue_ref ) 372 { 373 FT_Pos ref = *blue_ref; 374 FT_Pos shoot = *blue_shoot; 375 FT_Bool over_ref = FT_BOOL( shoot > ref ); 376 377 378 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref ) 379 *blue_shoot = *blue_ref = ( shoot + ref ) / 2; 380 } 381 382 blue->flags = 0; 383 if ( AF_LATIN_IS_TOP_BLUE( bb ) ) 384 blue->flags |= AF_LATIN_BLUE_TOP; 385 386 /* 387 * The following flag is used later to adjust the y and x scales 388 * in order to optimize the pixel grid alignment of the top of small 389 * letters. 390 */ 391 if ( bb == AF_LATIN_BLUE_SMALL_TOP ) 392 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT; 393 394 AF_LOG(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot )); 395 } 396 397 return; 398 } 399 400 401 FT_LOCAL_DEF( void ) 402 af_latin_metrics_check_digits( AF_LatinMetrics metrics, 403 FT_Face face ) 404 { 405 FT_UInt i; 406 FT_Bool started = 0, same_width = 1; 407 FT_Fixed advance, old_advance = 0; 408 409 410 /* check whether all ASCII digits have the same advance width; */ 411 /* digit `0' is 0x30 in all supported charmaps */ 412 for ( i = 0x30; i <= 0x39; i++ ) 413 { 414 FT_UInt glyph_index; 415 416 417 glyph_index = FT_Get_Char_Index( face, i ); 418 if ( glyph_index == 0 ) 419 continue; 420 421 if ( FT_Get_Advance( face, glyph_index, 422 FT_LOAD_NO_SCALE | 423 FT_LOAD_NO_HINTING | 424 FT_LOAD_IGNORE_TRANSFORM, 425 &advance ) ) 426 continue; 427 428 if ( started ) 429 { 430 if ( advance != old_advance ) 431 { 432 same_width = 0; 433 break; 434 } 435 } 436 else 437 { 438 old_advance = advance; 439 started = 1; 440 } 441 } 442 443 metrics->root.digits_have_same_width = same_width; 444 } 445 446 447 FT_LOCAL_DEF( FT_Error ) 448 af_latin_metrics_init( AF_LatinMetrics metrics, 449 FT_Face face ) 450 { 451 FT_Error error = AF_Err_Ok; 452 FT_CharMap oldmap = face->charmap; 453 FT_UInt ee; 454 455 static const FT_Encoding latin_encodings[] = 456 { 457 FT_ENCODING_UNICODE, 458 FT_ENCODING_APPLE_ROMAN, 459 FT_ENCODING_ADOBE_STANDARD, 460 FT_ENCODING_ADOBE_LATIN_1, 461 FT_ENCODING_NONE /* end of list */ 462 }; 463 464 465 metrics->units_per_em = face->units_per_EM; 466 467 /* do we have a latin charmap in there? */ 468 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ ) 469 { 470 error = FT_Select_Charmap( face, latin_encodings[ee] ); 471 if ( !error ) 472 break; 473 } 474 475 if ( !error ) 476 { 477 /* For now, compute the standard width and height from the `o'. */ 478 af_latin_metrics_init_widths( metrics, face, 'o' ); 479 af_latin_metrics_init_blues( metrics, face ); 480 af_latin_metrics_check_digits( metrics, face ); 481 } 482 483 FT_Set_Charmap( face, oldmap ); 484 return AF_Err_Ok; 485 } 486 487 488 static void 489 af_latin_metrics_scale_dim( AF_LatinMetrics metrics, 490 AF_Scaler scaler, 491 AF_Dimension dim ) 492 { 493 FT_Fixed scale; 494 FT_Pos delta; 495 AF_LatinAxis axis; 496 FT_UInt nn; 497 498 499 if ( dim == AF_DIMENSION_HORZ ) 500 { 501 scale = scaler->x_scale; 502 delta = scaler->x_delta; 503 } 504 else 505 { 506 scale = scaler->y_scale; 507 delta = scaler->y_delta; 508 } 509 510 axis = &metrics->axis[dim]; 511 512 if ( axis->org_scale == scale && axis->org_delta == delta ) 513 return; 514 515 axis->org_scale = scale; 516 axis->org_delta = delta; 517 518 /* 519 * correct X and Y scale to optimize the alignment of the top of small 520 * letters to the pixel grid 521 */ 522 { 523 AF_LatinAxis Axis = &metrics->axis[AF_DIMENSION_VERT]; 524 AF_LatinBlue blue = NULL; 525 526 527 for ( nn = 0; nn < Axis->blue_count; nn++ ) 528 { 529 if ( Axis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT ) 530 { 531 blue = &Axis->blues[nn]; 532 break; 533 } 534 } 535 536 if ( blue ) 537 { 538 FT_Pos scaled = FT_MulFix( blue->shoot.org, scaler->y_scale ); 539 FT_Pos fitted = ( scaled + 40 ) & ~63; 540 541 542 if ( scaled != fitted ) 543 { 544 #if 0 545 if ( dim == AF_DIMENSION_HORZ ) 546 { 547 if ( fitted < scaled ) 548 scale -= scale / 50; /* scale *= 0.98 */ 549 } 550 else 551 #endif 552 if ( dim == AF_DIMENSION_VERT ) 553 { 554 scale = FT_MulDiv( scale, fitted, scaled ); 555 } 556 } 557 } 558 } 559 560 axis->scale = scale; 561 axis->delta = delta; 562 563 if ( dim == AF_DIMENSION_HORZ ) 564 { 565 metrics->root.scaler.x_scale = scale; 566 metrics->root.scaler.x_delta = delta; 567 } 568 else 569 { 570 metrics->root.scaler.y_scale = scale; 571 metrics->root.scaler.y_delta = delta; 572 } 573 574 /* scale the standard widths */ 575 for ( nn = 0; nn < axis->width_count; nn++ ) 576 { 577 AF_Width width = axis->widths + nn; 578 579 580 width->cur = FT_MulFix( width->org, scale ); 581 width->fit = width->cur; 582 } 583 584 /* an extra-light axis corresponds to a standard width that is */ 585 /* smaller than 0.75 pixels */ 586 axis->extra_light = 587 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 ); 588 589 if ( dim == AF_DIMENSION_VERT ) 590 { 591 /* scale the blue zones */ 592 for ( nn = 0; nn < axis->blue_count; nn++ ) 593 { 594 AF_LatinBlue blue = &axis->blues[nn]; 595 FT_Pos dist; 596 597 598 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta; 599 blue->ref.fit = blue->ref.cur; 600 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta; 601 blue->shoot.fit = blue->shoot.cur; 602 blue->flags &= ~AF_LATIN_BLUE_ACTIVE; 603 604 /* a blue zone is only active if it is less than 3/4 pixels tall */ 605 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale ); 606 if ( dist <= 48 && dist >= -48 ) 607 { 608 FT_Pos delta1, delta2; 609 610 611 delta1 = blue->shoot.org - blue->ref.org; 612 delta2 = delta1; 613 if ( delta1 < 0 ) 614 delta2 = -delta2; 615 616 delta2 = FT_MulFix( delta2, scale ); 617 618 if ( delta2 < 32 ) 619 delta2 = 0; 620 else if ( delta2 < 64 ) 621 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); 622 else 623 delta2 = FT_PIX_ROUND( delta2 ); 624 625 if ( delta1 < 0 ) 626 delta2 = -delta2; 627 628 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur ); 629 blue->shoot.fit = blue->ref.fit + delta2; 630 631 blue->flags |= AF_LATIN_BLUE_ACTIVE; 632 } 633 } 634 } 635 } 636 637 638 FT_LOCAL_DEF( void ) 639 af_latin_metrics_scale( AF_LatinMetrics metrics, 640 AF_Scaler scaler ) 641 { 642 metrics->root.scaler.render_mode = scaler->render_mode; 643 metrics->root.scaler.face = scaler->face; 644 645 af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); 646 af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); 647 } 648 649 650 /*************************************************************************/ 651 /*************************************************************************/ 652 /***** *****/ 653 /***** L A T I N G L Y P H A N A L Y S I S *****/ 654 /***** *****/ 655 /*************************************************************************/ 656 /*************************************************************************/ 657 658 FT_LOCAL_DEF( FT_Error ) 659 af_latin_hints_compute_segments( AF_GlyphHints hints, 660 AF_Dimension dim ) 661 { 662 AF_AxisHints axis = &hints->axis[dim]; 663 FT_Memory memory = hints->memory; 664 FT_Error error = AF_Err_Ok; 665 AF_Segment segment = NULL; 666 AF_SegmentRec seg0; 667 AF_Point* contour = hints->contours; 668 AF_Point* contour_limit = contour + hints->num_contours; 669 AF_Direction major_dir, segment_dir; 670 671 672 FT_ZERO( &seg0 ); 673 seg0.score = 32000; 674 seg0.flags = AF_EDGE_NORMAL; 675 676 major_dir = (AF_Direction)FT_ABS( axis->major_dir ); 677 segment_dir = major_dir; 678 679 axis->num_segments = 0; 680 681 /* set up (u,v) in each point */ 682 if ( dim == AF_DIMENSION_HORZ ) 683 { 684 AF_Point point = hints->points; 685 AF_Point limit = point + hints->num_points; 686 687 688 for ( ; point < limit; point++ ) 689 { 690 point->u = point->fx; 691 point->v = point->fy; 692 } 693 } 694 else 695 { 696 AF_Point point = hints->points; 697 AF_Point limit = point + hints->num_points; 698 699 700 for ( ; point < limit; point++ ) 701 { 702 point->u = point->fy; 703 point->v = point->fx; 704 } 705 } 706 707 /* do each contour separately */ 708 for ( ; contour < contour_limit; contour++ ) 709 { 710 AF_Point point = contour[0]; 711 AF_Point last = point->prev; 712 int on_edge = 0; 713 FT_Pos min_pos = 32000; /* minimum segment pos != min_coord */ 714 FT_Pos max_pos = -32000; /* maximum segment pos != max_coord */ 715 FT_Bool passed; 716 717 718 if ( point == last ) /* skip singletons -- just in case */ 719 continue; 720 721 if ( FT_ABS( last->out_dir ) == major_dir && 722 FT_ABS( point->out_dir ) == major_dir ) 723 { 724 /* we are already on an edge, try to locate its start */ 725 last = point; 726 727 for (;;) 728 { 729 point = point->prev; 730 if ( FT_ABS( point->out_dir ) != major_dir ) 731 { 732 point = point->next; 733 break; 734 } 735 if ( point == last ) 736 break; 737 } 738 } 739 740 last = point; 741 passed = 0; 742 743 for (;;) 744 { 745 FT_Pos u, v; 746 747 748 if ( on_edge ) 749 { 750 u = point->u; 751 if ( u < min_pos ) 752 min_pos = u; 753 if ( u > max_pos ) 754 max_pos = u; 755 756 if ( point->out_dir != segment_dir || point == last ) 757 { 758 /* we are just leaving an edge; record a new segment! */ 759 segment->last = point; 760 segment->pos = (FT_Short)( ( min_pos + max_pos ) >> 1 ); 761 762 /* a segment is round if either its first or last point */ 763 /* is a control point */ 764 if ( ( segment->first->flags | point->flags ) & 765 AF_FLAG_CONTROL ) 766 segment->flags |= AF_EDGE_ROUND; 767 768 /* compute segment size */ 769 min_pos = max_pos = point->v; 770 771 v = segment->first->v; 772 if ( v < min_pos ) 773 min_pos = v; 774 if ( v > max_pos ) 775 max_pos = v; 776 777 segment->min_coord = (FT_Short)min_pos; 778 segment->max_coord = (FT_Short)max_pos; 779 segment->height = (FT_Short)( segment->max_coord - 780 segment->min_coord ); 781 782 on_edge = 0; 783 segment = NULL; 784 /* fallthrough */ 785 } 786 } 787 788 /* now exit if we are at the start/end point */ 789 if ( point == last ) 790 { 791 if ( passed ) 792 break; 793 passed = 1; 794 } 795 796 if ( !on_edge && FT_ABS( point->out_dir ) == major_dir ) 797 { 798 /* this is the start of a new segment! */ 799 segment_dir = (AF_Direction)point->out_dir; 800 801 /* clear all segment fields */ 802 error = af_axis_hints_new_segment( axis, memory, &segment ); 803 if ( error ) 804 goto Exit; 805 806 segment[0] = seg0; 807 segment->dir = (FT_Char)segment_dir; 808 min_pos = max_pos = point->u; 809 segment->first = point; 810 segment->last = point; 811 segment->contour = contour; 812 on_edge = 1; 813 } 814 815 point = point->next; 816 } 817 818 } /* contours */ 819 820 821 /* now slightly increase the height of segments when this makes */ 822 /* sense -- this is used to better detect and ignore serifs */ 823 { 824 AF_Segment segments = axis->segments; 825 AF_Segment segments_end = segments + axis->num_segments; 826 827 828 for ( segment = segments; segment < segments_end; segment++ ) 829 { 830 AF_Point first = segment->first; 831 AF_Point last = segment->last; 832 FT_Pos first_v = first->v; 833 FT_Pos last_v = last->v; 834 835 836 if ( first == last ) 837 continue; 838 839 if ( first_v < last_v ) 840 { 841 AF_Point p; 842 843 844 p = first->prev; 845 if ( p->v < first_v ) 846 segment->height = (FT_Short)( segment->height + 847 ( ( first_v - p->v ) >> 1 ) ); 848 849 p = last->next; 850 if ( p->v > last_v ) 851 segment->height = (FT_Short)( segment->height + 852 ( ( p->v - last_v ) >> 1 ) ); 853 } 854 else 855 { 856 AF_Point p; 857 858 859 p = first->prev; 860 if ( p->v > first_v ) 861 segment->height = (FT_Short)( segment->height + 862 ( ( p->v - first_v ) >> 1 ) ); 863 864 p = last->next; 865 if ( p->v < last_v ) 866 segment->height = (FT_Short)( segment->height + 867 ( ( last_v - p->v ) >> 1 ) ); 868 } 869 } 870 } 871 872 Exit: 873 return error; 874 } 875 876 877 FT_LOCAL_DEF( void ) 878 af_latin_hints_link_segments( AF_GlyphHints hints, 879 AF_Dimension dim ) 880 { 881 AF_AxisHints axis = &hints->axis[dim]; 882 AF_Segment segments = axis->segments; 883 AF_Segment segment_limit = segments + axis->num_segments; 884 FT_Pos len_threshold, len_score; 885 AF_Segment seg1, seg2; 886 887 888 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); 889 if ( len_threshold == 0 ) 890 len_threshold = 1; 891 892 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 ); 893 894 /* now compare each segment to the others */ 895 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 896 { 897 /* the fake segments are introduced to hint the metrics -- */ 898 /* we must never link them to anything */ 899 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last ) 900 continue; 901 902 for ( seg2 = segments; seg2 < segment_limit; seg2++ ) 903 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos ) 904 { 905 FT_Pos pos1 = seg1->pos; 906 FT_Pos pos2 = seg2->pos; 907 FT_Pos dist = pos2 - pos1; 908 909 910 if ( dist < 0 ) 911 dist = -dist; 912 913 { 914 FT_Pos min = seg1->min_coord; 915 FT_Pos max = seg1->max_coord; 916 FT_Pos len, score; 917 918 919 if ( min < seg2->min_coord ) 920 min = seg2->min_coord; 921 922 if ( max > seg2->max_coord ) 923 max = seg2->max_coord; 924 925 len = max - min; 926 if ( len >= len_threshold ) 927 { 928 score = dist + len_score / len; 929 930 if ( score < seg1->score ) 931 { 932 seg1->score = score; 933 seg1->link = seg2; 934 } 935 936 if ( score < seg2->score ) 937 { 938 seg2->score = score; 939 seg2->link = seg1; 940 } 941 } 942 } 943 } 944 } 945 946 /* now, compute the `serif' segments */ 947 for ( seg1 = segments; seg1 < segment_limit; seg1++ ) 948 { 949 seg2 = seg1->link; 950 951 if ( seg2 ) 952 { 953 if ( seg2->link != seg1 ) 954 { 955 seg1->link = 0; 956 seg1->serif = seg2->link; 957 } 958 } 959 } 960 } 961 962 963 FT_LOCAL_DEF( FT_Error ) 964 af_latin_hints_compute_edges( AF_GlyphHints hints, 965 AF_Dimension dim ) 966 { 967 AF_AxisHints axis = &hints->axis[dim]; 968 FT_Error error = AF_Err_Ok; 969 FT_Memory memory = hints->memory; 970 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim]; 971 972 AF_Segment segments = axis->segments; 973 AF_Segment segment_limit = segments + axis->num_segments; 974 AF_Segment seg; 975 976 AF_Direction up_dir; 977 FT_Fixed scale; 978 FT_Pos edge_distance_threshold; 979 FT_Pos segment_length_threshold; 980 981 982 axis->num_edges = 0; 983 984 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale 985 : hints->y_scale; 986 987 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP 988 : AF_DIR_RIGHT; 989 990 /* 991 * We ignore all segments that are less than 1 pixels in length, 992 * to avoid many problems with serif fonts. We compute the 993 * corresponding threshold in font units. 994 */ 995 if ( dim == AF_DIMENSION_HORZ ) 996 segment_length_threshold = FT_DivFix( 64, hints->y_scale ); 997 else 998 segment_length_threshold = 0; 999 1000 /*********************************************************************/ 1001 /* */ 1002 /* We will begin by generating a sorted table of edges for the */ 1003 /* current direction. To do so, we simply scan each segment and try */ 1004 /* to find an edge in our table that corresponds to its position. */ 1005 /* */ 1006 /* If no edge is found, we create and insert a new edge in the */ 1007 /* sorted table. Otherwise, we simply add the segment to the edge's */ 1008 /* list which will be processed in the second step to compute the */ 1009 /* edge's properties. */ 1010 /* */ 1011 /* Note that the edges table is sorted along the segment/edge */ 1012 /* position. */ 1013 /* */ 1014 /*********************************************************************/ 1015 1016 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, 1017 scale ); 1018 if ( edge_distance_threshold > 64 / 4 ) 1019 edge_distance_threshold = 64 / 4; 1020 1021 edge_distance_threshold = FT_DivFix( edge_distance_threshold, 1022 scale ); 1023 1024 for ( seg = segments; seg < segment_limit; seg++ ) 1025 { 1026 AF_Edge found = 0; 1027 FT_Int ee; 1028 1029 1030 if ( seg->height < segment_length_threshold ) 1031 continue; 1032 1033 /* A special case for serif edges: If they are smaller than */ 1034 /* 1.5 pixels we ignore them. */ 1035 if ( seg->serif && 1036 2 * seg->height < 3 * segment_length_threshold ) 1037 continue; 1038 1039 /* look for an edge corresponding to the segment */ 1040 for ( ee = 0; ee < axis->num_edges; ee++ ) 1041 { 1042 AF_Edge edge = axis->edges + ee; 1043 FT_Pos dist; 1044 1045 1046 dist = seg->pos - edge->fpos; 1047 if ( dist < 0 ) 1048 dist = -dist; 1049 1050 if ( dist < edge_distance_threshold && edge->dir == seg->dir ) 1051 { 1052 found = edge; 1053 break; 1054 } 1055 } 1056 1057 if ( !found ) 1058 { 1059 AF_Edge edge; 1060 1061 1062 /* insert a new edge in the list and */ 1063 /* sort according to the position */ 1064 error = af_axis_hints_new_edge( axis, seg->pos, 1065 (AF_Direction)seg->dir, 1066 memory, &edge ); 1067 if ( error ) 1068 goto Exit; 1069 1070 /* add the segment to the new edge's list */ 1071 FT_ZERO( edge ); 1072 1073 edge->first = seg; 1074 edge->last = seg; 1075 edge->fpos = seg->pos; 1076 edge->dir = seg->dir; 1077 edge->opos = edge->pos = FT_MulFix( seg->pos, scale ); 1078 seg->edge_next = seg; 1079 } 1080 else 1081 { 1082 /* if an edge was found, simply add the segment to the edge's */ 1083 /* list */ 1084 seg->edge_next = found->first; 1085 found->last->edge_next = seg; 1086 found->last = seg; 1087 } 1088 } 1089 1090 1091 /*********************************************************************/ 1092 /* */ 1093 /* Good, we will now compute each edge's properties according to */ 1094 /* segments found on its position. Basically, these are: */ 1095 /* */ 1096 /* - edge's main direction */ 1097 /* - stem edge, serif edge or both (which defaults to stem then) */ 1098 /* - rounded edge, straight or both (which defaults to straight) */ 1099 /* - link for edge */ 1100 /* */ 1101 /*********************************************************************/ 1102 1103 /* first of all, set the `edge' field in each segment -- this is */ 1104 /* required in order to compute edge links */ 1105 1106 /* 1107 * Note that removing this loop and setting the `edge' field of each 1108 * segment directly in the code above slows down execution speed for 1109 * some reasons on platforms like the Sun. 1110 */ 1111 { 1112 AF_Edge edges = axis->edges; 1113 AF_Edge edge_limit = edges + axis->num_edges; 1114 AF_Edge edge; 1115 1116 1117 for ( edge = edges; edge < edge_limit; edge++ ) 1118 { 1119 seg = edge->first; 1120 if ( seg ) 1121 do 1122 { 1123 seg->edge = edge; 1124 seg = seg->edge_next; 1125 1126 } while ( seg != edge->first ); 1127 } 1128 1129 /* now, compute each edge properties */ 1130 for ( edge = edges; edge < edge_limit; edge++ ) 1131 { 1132 FT_Int is_round = 0; /* does it contain round segments? */ 1133 FT_Int is_straight = 0; /* does it contain straight segments? */ 1134 FT_Pos ups = 0; /* number of upwards segments */ 1135 FT_Pos downs = 0; /* number of downwards segments */ 1136 1137 1138 seg = edge->first; 1139 1140 do 1141 { 1142 FT_Bool is_serif; 1143 1144 1145 /* check for roundness of segment */ 1146 if ( seg->flags & AF_EDGE_ROUND ) 1147 is_round++; 1148 else 1149 is_straight++; 1150 1151 /* check for segment direction */ 1152 if ( seg->dir == up_dir ) 1153 ups += seg->max_coord-seg->min_coord; 1154 else 1155 downs += seg->max_coord-seg->min_coord; 1156 1157 /* check for links -- if seg->serif is set, then seg->link must */ 1158 /* be ignored */ 1159 is_serif = (FT_Bool)( seg->serif && 1160 seg->serif->edge && 1161 seg->serif->edge != edge ); 1162 1163 if ( ( seg->link && seg->link->edge != NULL ) || is_serif ) 1164 { 1165 AF_Edge edge2; 1166 AF_Segment seg2; 1167 1168 1169 edge2 = edge->link; 1170 seg2 = seg->link; 1171 1172 if ( is_serif ) 1173 { 1174 seg2 = seg->serif; 1175 edge2 = edge->serif; 1176 } 1177 1178 if ( edge2 ) 1179 { 1180 FT_Pos edge_delta; 1181 FT_Pos seg_delta; 1182 1183 1184 edge_delta = edge->fpos - edge2->fpos; 1185 if ( edge_delta < 0 ) 1186 edge_delta = -edge_delta; 1187 1188 seg_delta = seg->pos - seg2->pos; 1189 if ( seg_delta < 0 ) 1190 seg_delta = -seg_delta; 1191 1192 if ( seg_delta < edge_delta ) 1193 edge2 = seg2->edge; 1194 } 1195 else 1196 edge2 = seg2->edge; 1197 1198 if ( is_serif ) 1199 { 1200 edge->serif = edge2; 1201 edge2->flags |= AF_EDGE_SERIF; 1202 } 1203 else 1204 edge->link = edge2; 1205 } 1206 1207 seg = seg->edge_next; 1208 1209 } while ( seg != edge->first ); 1210 1211 /* set the round/straight flags */ 1212 edge->flags = AF_EDGE_NORMAL; 1213 1214 if ( is_round > 0 && is_round >= is_straight ) 1215 edge->flags |= AF_EDGE_ROUND; 1216 1217 #if 0 1218 /* set the edge's main direction */ 1219 edge->dir = AF_DIR_NONE; 1220 1221 if ( ups > downs ) 1222 edge->dir = (FT_Char)up_dir; 1223 1224 else if ( ups < downs ) 1225 edge->dir = (FT_Char)-up_dir; 1226 1227 else if ( ups == downs ) 1228 edge->dir = 0; /* both up and down! */ 1229 #endif 1230 1231 /* gets rid of serifs if link is set */ 1232 /* XXX: This gets rid of many unpleasant artefacts! */ 1233 /* Example: the `c' in cour.pfa at size 13 */ 1234 1235 if ( edge->serif && edge->link ) 1236 edge->serif = 0; 1237 } 1238 } 1239 1240 Exit: 1241 return error; 1242 } 1243 1244 1245 FT_LOCAL_DEF( FT_Error ) 1246 af_latin_hints_detect_features( AF_GlyphHints hints, 1247 AF_Dimension dim ) 1248 { 1249 FT_Error error; 1250 1251 1252 error = af_latin_hints_compute_segments( hints, dim ); 1253 if ( !error ) 1254 { 1255 af_latin_hints_link_segments( hints, dim ); 1256 1257 error = af_latin_hints_compute_edges( hints, dim ); 1258 } 1259 return error; 1260 } 1261 1262 1263 FT_LOCAL_DEF( void ) 1264 af_latin_hints_compute_blue_edges( AF_GlyphHints hints, 1265 AF_LatinMetrics metrics ) 1266 { 1267 AF_AxisHints axis = &hints->axis[ AF_DIMENSION_VERT ]; 1268 AF_Edge edge = axis->edges; 1269 AF_Edge edge_limit = edge + axis->num_edges; 1270 AF_LatinAxis latin = &metrics->axis[ AF_DIMENSION_VERT ]; 1271 FT_Fixed scale = latin->scale; 1272 1273 1274 /* compute which blue zones are active, i.e. have their scaled */ 1275 /* size < 3/4 pixels */ 1276 1277 /* for each horizontal edge search the blue zone which is closest */ 1278 for ( ; edge < edge_limit; edge++ ) 1279 { 1280 FT_Int bb; 1281 AF_Width best_blue = NULL; 1282 FT_Pos best_dist; /* initial threshold */ 1283 1284 1285 /* compute the initial threshold as a fraction of the EM size */ 1286 best_dist = FT_MulFix( metrics->units_per_em / 40, scale ); 1287 1288 if ( best_dist > 64 / 2 ) 1289 best_dist = 64 / 2; 1290 1291 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ ) 1292 { 1293 AF_LatinBlue blue = latin->blues + bb; 1294 FT_Bool is_top_blue, is_major_dir; 1295 1296 1297 /* skip inactive blue zones (i.e., those that are too small) */ 1298 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) ) 1299 continue; 1300 1301 /* if it is a top zone, check for right edges -- if it is a bottom */ 1302 /* zone, check for left edges */ 1303 /* */ 1304 /* of course, that's for TrueType */ 1305 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 ); 1306 is_major_dir = FT_BOOL( edge->dir == axis->major_dir ); 1307 1308 /* if it is a top zone, the edge must be against the major */ 1309 /* direction; if it is a bottom zone, it must be in the major */ 1310 /* direction */ 1311 if ( is_top_blue ^ is_major_dir ) 1312 { 1313 FT_Pos dist; 1314 1315 1316 /* first of all, compare it to the reference position */ 1317 dist = edge->fpos - blue->ref.org; 1318 if ( dist < 0 ) 1319 dist = -dist; 1320 1321 dist = FT_MulFix( dist, scale ); 1322 if ( dist < best_dist ) 1323 { 1324 best_dist = dist; 1325 best_blue = & blue->ref; 1326 } 1327 1328 /* now, compare it to the overshoot position if the edge is */ 1329 /* rounded, and if the edge is over the reference position of a */ 1330 /* top zone, or under the reference position of a bottom zone */ 1331 if ( edge->flags & AF_EDGE_ROUND && dist != 0 ) 1332 { 1333 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org ); 1334 1335 1336 if ( is_top_blue ^ is_under_ref ) 1337 { 1338 blue = latin->blues + bb; 1339 dist = edge->fpos - blue->shoot.org; 1340 if ( dist < 0 ) 1341 dist = -dist; 1342 1343 dist = FT_MulFix( dist, scale ); 1344 if ( dist < best_dist ) 1345 { 1346 best_dist = dist; 1347 best_blue = & blue->shoot; 1348 } 1349 } 1350 } 1351 } 1352 } 1353 1354 if ( best_blue ) 1355 edge->blue_edge = best_blue; 1356 } 1357 } 1358 1359 1360 static FT_Error 1361 af_latin_hints_init( AF_GlyphHints hints, 1362 AF_LatinMetrics metrics ) 1363 { 1364 FT_Render_Mode mode; 1365 FT_UInt32 scaler_flags, other_flags; 1366 FT_Face face = metrics->root.scaler.face; 1367 1368 1369 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics ); 1370 1371 /* 1372 * correct x_scale and y_scale if needed, since they may have 1373 * been modified `af_latin_metrics_scale_dim' above 1374 */ 1375 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; 1376 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; 1377 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; 1378 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; 1379 1380 /* compute flags depending on render mode, etc. */ 1381 mode = metrics->root.scaler.render_mode; 1382 1383 #if 0 /* #ifdef AF_USE_WARPER */ 1384 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) 1385 { 1386 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; 1387 } 1388 #endif 1389 1390 scaler_flags = hints->scaler_flags; 1391 other_flags = 0; 1392 1393 /* 1394 * We snap the width of vertical stems for the monochrome and 1395 * horizontal LCD rendering targets only. 1396 */ 1397 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) 1398 other_flags |= AF_LATIN_HINTS_HORZ_SNAP; 1399 1400 /* 1401 * We snap the width of horizontal stems for the monochrome and 1402 * vertical LCD rendering targets only. 1403 */ 1404 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) 1405 other_flags |= AF_LATIN_HINTS_VERT_SNAP; 1406 1407 /* 1408 * We adjust stems to full pixels only if we don't use the `light' mode. 1409 */ 1410 if ( mode != FT_RENDER_MODE_LIGHT ) 1411 other_flags |= AF_LATIN_HINTS_STEM_ADJUST; 1412 1413 if ( mode == FT_RENDER_MODE_MONO ) 1414 other_flags |= AF_LATIN_HINTS_MONO; 1415 1416 /* 1417 * In `light' hinting mode we disable horizontal hinting completely. 1418 * We also do it if the face is italic. 1419 */ 1420 if ( mode == FT_RENDER_MODE_LIGHT || 1421 (face->style_flags & FT_STYLE_FLAG_ITALIC) != 0 ) 1422 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL; 1423 1424 hints->scaler_flags = scaler_flags; 1425 hints->other_flags = other_flags; 1426 1427 return 0; 1428 } 1429 1430 1431 /*************************************************************************/ 1432 /*************************************************************************/ 1433 /***** *****/ 1434 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/ 1435 /***** *****/ 1436 /*************************************************************************/ 1437 /*************************************************************************/ 1438 1439 /* snap a given width in scaled coordinates to one of the */ 1440 /* current standard widths */ 1441 1442 static FT_Pos 1443 af_latin_snap_width( AF_Width widths, 1444 FT_Int count, 1445 FT_Pos width ) 1446 { 1447 int n; 1448 FT_Pos best = 64 + 32 + 2; 1449 FT_Pos reference = width; 1450 FT_Pos scaled; 1451 1452 1453 for ( n = 0; n < count; n++ ) 1454 { 1455 FT_Pos w; 1456 FT_Pos dist; 1457 1458 1459 w = widths[n].cur; 1460 dist = width - w; 1461 if ( dist < 0 ) 1462 dist = -dist; 1463 if ( dist < best ) 1464 { 1465 best = dist; 1466 reference = w; 1467 } 1468 } 1469 1470 scaled = FT_PIX_ROUND( reference ); 1471 1472 if ( width >= reference ) 1473 { 1474 if ( width < scaled + 48 ) 1475 width = reference; 1476 } 1477 else 1478 { 1479 if ( width > scaled - 48 ) 1480 width = reference; 1481 } 1482 1483 return width; 1484 } 1485 1486 1487 /* compute the snapped width of a given stem */ 1488 1489 static FT_Pos 1490 af_latin_compute_stem_width( AF_GlyphHints hints, 1491 AF_Dimension dim, 1492 FT_Pos width, 1493 AF_Edge_Flags base_flags, 1494 AF_Edge_Flags stem_flags ) 1495 { 1496 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics; 1497 AF_LatinAxis axis = & metrics->axis[dim]; 1498 FT_Pos dist = width; 1499 FT_Int sign = 0; 1500 FT_Int vertical = ( dim == AF_DIMENSION_VERT ); 1501 1502 1503 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) || 1504 axis->extra_light ) 1505 return width; 1506 1507 if ( dist < 0 ) 1508 { 1509 dist = -width; 1510 sign = 1; 1511 } 1512 1513 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || 1514 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) 1515 { 1516 /* smooth hinting process: very lightly quantize the stem width */ 1517 1518 /* leave the widths of serifs alone */ 1519 1520 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) ) 1521 goto Done_Width; 1522 1523 else if ( ( base_flags & AF_EDGE_ROUND ) ) 1524 { 1525 if ( dist < 80 ) 1526 dist = 64; 1527 } 1528 else if ( dist < 56 ) 1529 dist = 56; 1530 1531 if ( axis->width_count > 0 ) 1532 { 1533 FT_Pos delta; 1534 1535 1536 /* compare to standard width */ 1537 if ( axis->width_count > 0 ) 1538 { 1539 delta = dist - axis->widths[0].cur; 1540 1541 if ( delta < 0 ) 1542 delta = -delta; 1543 1544 if ( delta < 40 ) 1545 { 1546 dist = axis->widths[0].cur; 1547 if ( dist < 48 ) 1548 dist = 48; 1549 1550 goto Done_Width; 1551 } 1552 } 1553 1554 if ( dist < 3 * 64 ) 1555 { 1556 delta = dist & 63; 1557 dist &= -64; 1558 1559 if ( delta < 10 ) 1560 dist += delta; 1561 1562 else if ( delta < 32 ) 1563 dist += 10; 1564 1565 else if ( delta < 54 ) 1566 dist += 54; 1567 1568 else 1569 dist += delta; 1570 } 1571 else 1572 dist = ( dist + 32 ) & ~63; 1573 } 1574 } 1575 else 1576 { 1577 /* strong hinting process: snap the stem width to integer pixels */ 1578 FT_Pos org_dist = dist; 1579 1580 1581 dist = af_latin_snap_width( axis->widths, axis->width_count, dist ); 1582 1583 if ( vertical ) 1584 { 1585 /* in the case of vertical hinting, always round */ 1586 /* the stem heights to integer pixels */ 1587 1588 if ( dist >= 64 ) 1589 dist = ( dist + 16 ) & ~63; 1590 else 1591 dist = 64; 1592 } 1593 else 1594 { 1595 if ( AF_LATIN_HINTS_DO_MONO( hints ) ) 1596 { 1597 /* monochrome horizontal hinting: snap widths to integer pixels */ 1598 /* with a different threshold */ 1599 1600 if ( dist < 64 ) 1601 dist = 64; 1602 else 1603 dist = ( dist + 32 ) & ~63; 1604 } 1605 else 1606 { 1607 /* for horizontal anti-aliased hinting, we adopt a more subtle */ 1608 /* approach: we strengthen small stems, round stems whose size */ 1609 /* is between 1 and 2 pixels to an integer, otherwise nothing */ 1610 1611 if ( dist < 48 ) 1612 dist = ( dist + 64 ) >> 1; 1613 1614 else if ( dist < 128 ) 1615 { 1616 /* We only round to an integer width if the corresponding */ 1617 /* distortion is less than 1/4 pixel. Otherwise this */ 1618 /* makes everything worse since the diagonals, which are */ 1619 /* not hinted, appear a lot bolder or thinner than the */ 1620 /* vertical stems. */ 1621 1622 FT_Pos delta; 1623 1624 1625 dist = ( dist + 22 ) & ~63; 1626 delta = dist - org_dist; 1627 if ( delta < 0 ) 1628 delta = -delta; 1629 1630 if (delta >= 16) 1631 { 1632 dist = org_dist; 1633 if ( dist < 48 ) 1634 dist = ( dist + 64 ) >> 1; 1635 } 1636 } 1637 else 1638 /* round otherwise to prevent color fringes in LCD mode */ 1639 dist = ( dist + 32 ) & ~63; 1640 } 1641 } 1642 } 1643 1644 Done_Width: 1645 if ( sign ) 1646 dist = -dist; 1647 1648 return dist; 1649 } 1650 1651 1652 /* align one stem edge relative to the previous stem edge */ 1653 1654 static void 1655 af_latin_align_linked_edge( AF_GlyphHints hints, 1656 AF_Dimension dim, 1657 AF_Edge base_edge, 1658 AF_Edge stem_edge ) 1659 { 1660 FT_Pos dist = stem_edge->opos - base_edge->opos; 1661 1662 FT_Pos fitted_width = af_latin_compute_stem_width( 1663 hints, dim, dist, 1664 (AF_Edge_Flags)base_edge->flags, 1665 (AF_Edge_Flags)stem_edge->flags ); 1666 1667 1668 stem_edge->pos = base_edge->pos + fitted_width; 1669 1670 AF_LOG(( "LINK: edge %d (opos=%.2f) linked to (%.2f), " 1671 "dist was %.2f, now %.2f\n", 1672 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0, 1673 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 )); 1674 } 1675 1676 1677 static void 1678 af_latin_align_serif_edge( AF_GlyphHints hints, 1679 AF_Edge base, 1680 AF_Edge serif ) 1681 { 1682 FT_UNUSED( hints ); 1683 1684 serif->pos = base->pos + (serif->opos - base->opos); 1685 } 1686 1687 1688 /*************************************************************************/ 1689 /*************************************************************************/ 1690 /*************************************************************************/ 1691 /**** ****/ 1692 /**** E D G E H I N T I N G ****/ 1693 /**** ****/ 1694 /*************************************************************************/ 1695 /*************************************************************************/ 1696 /*************************************************************************/ 1697 1698 1699 FT_LOCAL_DEF( void ) 1700 af_latin_hint_edges( AF_GlyphHints hints, 1701 AF_Dimension dim ) 1702 { 1703 AF_AxisHints axis = &hints->axis[dim]; 1704 AF_Edge edges = axis->edges; 1705 AF_Edge edge_limit = edges + axis->num_edges; 1706 FT_PtrDist n_edges; 1707 AF_Edge edge; 1708 AF_Edge anchor = 0; 1709 FT_Int has_serifs = 0; 1710 1711 1712 /* we begin by aligning all stems relative to the blue zone */ 1713 /* if needed -- that's only for horizontal edges */ 1714 1715 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) ) 1716 { 1717 for ( edge = edges; edge < edge_limit; edge++ ) 1718 { 1719 AF_Width blue; 1720 AF_Edge edge1, edge2; 1721 1722 1723 if ( edge->flags & AF_EDGE_DONE ) 1724 continue; 1725 1726 blue = edge->blue_edge; 1727 edge1 = NULL; 1728 edge2 = edge->link; 1729 1730 if ( blue ) 1731 { 1732 edge1 = edge; 1733 } 1734 else if ( edge2 && edge2->blue_edge ) 1735 { 1736 blue = edge2->blue_edge; 1737 edge1 = edge2; 1738 edge2 = edge; 1739 } 1740 1741 if ( !edge1 ) 1742 continue; 1743 1744 AF_LOG(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), " 1745 "was (%.2f)\n", 1746 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0, 1747 edge1->pos / 64.0 )); 1748 1749 edge1->pos = blue->fit; 1750 edge1->flags |= AF_EDGE_DONE; 1751 1752 if ( edge2 && !edge2->blue_edge ) 1753 { 1754 af_latin_align_linked_edge( hints, dim, edge1, edge2 ); 1755 edge2->flags |= AF_EDGE_DONE; 1756 } 1757 1758 if ( !anchor ) 1759 anchor = edge; 1760 } 1761 } 1762 1763 /* now we will align all stem edges, trying to maintain the */ 1764 /* relative order of stems in the glyph */ 1765 for ( edge = edges; edge < edge_limit; edge++ ) 1766 { 1767 AF_Edge edge2; 1768 1769 1770 if ( edge->flags & AF_EDGE_DONE ) 1771 continue; 1772 1773 /* skip all non-stem edges */ 1774 edge2 = edge->link; 1775 if ( !edge2 ) 1776 { 1777 has_serifs++; 1778 continue; 1779 } 1780 1781 /* now align the stem */ 1782 1783 /* this should not happen, but it's better to be safe */ 1784 if ( edge2->blue_edge ) 1785 { 1786 AF_LOG(( "ASSERTION FAILED for edge %d\n", edge2-edges )); 1787 1788 af_latin_align_linked_edge( hints, dim, edge2, edge ); 1789 edge->flags |= AF_EDGE_DONE; 1790 continue; 1791 } 1792 1793 if ( !anchor ) 1794 { 1795 FT_Pos org_len, org_center, cur_len; 1796 FT_Pos cur_pos1, error1, error2, u_off, d_off; 1797 1798 1799 org_len = edge2->opos - edge->opos; 1800 cur_len = af_latin_compute_stem_width( 1801 hints, dim, org_len, 1802 (AF_Edge_Flags)edge->flags, 1803 (AF_Edge_Flags)edge2->flags ); 1804 if ( cur_len <= 64 ) 1805 u_off = d_off = 32; 1806 else 1807 { 1808 u_off = 38; 1809 d_off = 26; 1810 } 1811 1812 if ( cur_len < 96 ) 1813 { 1814 org_center = edge->opos + ( org_len >> 1 ); 1815 1816 cur_pos1 = FT_PIX_ROUND( org_center ); 1817 1818 error1 = org_center - ( cur_pos1 - u_off ); 1819 if ( error1 < 0 ) 1820 error1 = -error1; 1821 1822 error2 = org_center - ( cur_pos1 + d_off ); 1823 if ( error2 < 0 ) 1824 error2 = -error2; 1825 1826 if ( error1 < error2 ) 1827 cur_pos1 -= u_off; 1828 else 1829 cur_pos1 += d_off; 1830 1831 edge->pos = cur_pos1 - cur_len / 2; 1832 edge2->pos = edge->pos + cur_len; 1833 } 1834 else 1835 edge->pos = FT_PIX_ROUND( edge->opos ); 1836 1837 AF_LOG(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f) " 1838 "snapped to (%.2f) (%.2f)\n", 1839 edge-edges, edge->opos / 64.0, 1840 edge2-edges, edge2->opos / 64.0, 1841 edge->pos / 64.0, edge2->pos / 64.0 )); 1842 anchor = edge; 1843 1844 edge->flags |= AF_EDGE_DONE; 1845 1846 af_latin_align_linked_edge( hints, dim, edge, edge2 ); 1847 } 1848 else 1849 { 1850 FT_Pos org_pos, org_len, org_center, cur_len; 1851 FT_Pos cur_pos1, cur_pos2, delta1, delta2; 1852 1853 1854 org_pos = anchor->pos + ( edge->opos - anchor->opos ); 1855 org_len = edge2->opos - edge->opos; 1856 org_center = org_pos + ( org_len >> 1 ); 1857 1858 cur_len = af_latin_compute_stem_width( 1859 hints, dim, org_len, 1860 (AF_Edge_Flags)edge->flags, 1861 (AF_Edge_Flags)edge2->flags ); 1862 1863 if ( edge2->flags & AF_EDGE_DONE ) 1864 edge->pos = edge2->pos - cur_len; 1865 1866 else if ( cur_len < 96 ) 1867 { 1868 FT_Pos u_off, d_off; 1869 1870 1871 cur_pos1 = FT_PIX_ROUND( org_center ); 1872 1873 if (cur_len <= 64 ) 1874 u_off = d_off = 32; 1875 else 1876 { 1877 u_off = 38; 1878 d_off = 26; 1879 } 1880 1881 delta1 = org_center - ( cur_pos1 - u_off ); 1882 if ( delta1 < 0 ) 1883 delta1 = -delta1; 1884 1885 delta2 = org_center - ( cur_pos1 + d_off ); 1886 if ( delta2 < 0 ) 1887 delta2 = -delta2; 1888 1889 if ( delta1 < delta2 ) 1890 cur_pos1 -= u_off; 1891 else 1892 cur_pos1 += d_off; 1893 1894 edge->pos = cur_pos1 - cur_len / 2; 1895 edge2->pos = cur_pos1 + cur_len / 2; 1896 1897 AF_LOG(( "STEM: %d (opos=%.2f) to %d (opos=%.2f) " 1898 "snapped to (%.2f) and (%.2f)\n", 1899 edge-edges, edge->opos / 64.0, 1900 edge2-edges, edge2->opos / 64.0, 1901 edge->pos / 64.0, edge2->pos / 64.0 )); 1902 } 1903 else 1904 { 1905 org_pos = anchor->pos + ( edge->opos - anchor->opos ); 1906 org_len = edge2->opos - edge->opos; 1907 org_center = org_pos + ( org_len >> 1 ); 1908 1909 cur_len = af_latin_compute_stem_width( 1910 hints, dim, org_len, 1911 (AF_Edge_Flags)edge->flags, 1912 (AF_Edge_Flags)edge2->flags ); 1913 1914 cur_pos1 = FT_PIX_ROUND( org_pos ); 1915 delta1 = cur_pos1 + ( cur_len >> 1 ) - org_center; 1916 if ( delta1 < 0 ) 1917 delta1 = -delta1; 1918 1919 cur_pos2 = FT_PIX_ROUND( org_pos + org_len ) - cur_len; 1920 delta2 = cur_pos2 + ( cur_len >> 1 ) - org_center; 1921 if ( delta2 < 0 ) 1922 delta2 = -delta2; 1923 1924 edge->pos = ( delta1 < delta2 ) ? cur_pos1 : cur_pos2; 1925 edge2->pos = edge->pos + cur_len; 1926 1927 AF_LOG(( "STEM: %d (opos=%.2f) to %d (opos=%.2f) " 1928 "snapped to (%.2f) and (%.2f)\n", 1929 edge-edges, edge->opos / 64.0, 1930 edge2-edges, edge2->opos / 64.0, 1931 edge->pos / 64.0, edge2->pos / 64.0 )); 1932 } 1933 1934 edge->flags |= AF_EDGE_DONE; 1935 edge2->flags |= AF_EDGE_DONE; 1936 1937 if ( edge > edges && edge->pos < edge[-1].pos ) 1938 { 1939 AF_LOG(( "BOUND: %d (pos=%.2f) to (%.2f)\n", 1940 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 )); 1941 edge->pos = edge[-1].pos; 1942 } 1943 } 1944 } 1945 1946 /* make sure that lowercase m's maintain their symmetry */ 1947 1948 /* In general, lowercase m's have six vertical edges if they are sans */ 1949 /* serif, or twelve if they are with serifs. This implementation is */ 1950 /* based on that assumption, and seems to work very well with most */ 1951 /* faces. However, if for a certain face this assumption is not */ 1952 /* true, the m is just rendered like before. In addition, any stem */ 1953 /* correction will only be applied to symmetrical glyphs (even if the */ 1954 /* glyph is not an m), so the potential for unwanted distortion is */ 1955 /* relatively low. */ 1956 1957 /* We don't handle horizontal edges since we can't easily assure that */ 1958 /* the third (lowest) stem aligns with the base line; it might end up */ 1959 /* one pixel higher or lower. */ 1960 1961 n_edges = edge_limit - edges; 1962 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) 1963 { 1964 AF_Edge edge1, edge2, edge3; 1965 FT_Pos dist1, dist2, span, delta; 1966 1967 1968 if ( n_edges == 6 ) 1969 { 1970 edge1 = edges; 1971 edge2 = edges + 2; 1972 edge3 = edges + 4; 1973 } 1974 else 1975 { 1976 edge1 = edges + 1; 1977 edge2 = edges + 5; 1978 edge3 = edges + 9; 1979 } 1980 1981 dist1 = edge2->opos - edge1->opos; 1982 dist2 = edge3->opos - edge2->opos; 1983 1984 span = dist1 - dist2; 1985 if ( span < 0 ) 1986 span = -span; 1987 1988 if ( span < 8 ) 1989 { 1990 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos ); 1991 edge3->pos -= delta; 1992 if ( edge3->link ) 1993 edge3->link->pos -= delta; 1994 1995 /* move the serifs along with the stem */ 1996 if ( n_edges == 12 ) 1997 { 1998 ( edges + 8 )->pos -= delta; 1999 ( edges + 11 )->pos -= delta; 2000 } 2001 2002 edge3->flags |= AF_EDGE_DONE; 2003 if ( edge3->link ) 2004 edge3->link->flags |= AF_EDGE_DONE; 2005 } 2006 } 2007 2008 if ( has_serifs || !anchor ) 2009 { 2010 /* 2011 * now hint the remaining edges (serifs and single) in order 2012 * to complete our processing 2013 */ 2014 for ( edge = edges; edge < edge_limit; edge++ ) 2015 { 2016 FT_Pos delta; 2017 2018 2019 if ( edge->flags & AF_EDGE_DONE ) 2020 continue; 2021 2022 delta = 1000; 2023 2024 if ( edge->serif ) 2025 { 2026 delta = edge->serif->opos - edge->opos; 2027 if ( delta < 0 ) 2028 delta = -delta; 2029 } 2030 2031 if ( delta < 64 + 16 ) 2032 { 2033 af_latin_align_serif_edge( hints, edge->serif, edge ); 2034 AF_LOG(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f) " 2035 "aligned to (%.2f)\n", 2036 edge-edges, edge->opos / 64.0, 2037 edge->serif - edges, edge->serif->opos / 64.0, 2038 edge->pos / 64.0 )); 2039 } 2040 else if ( !anchor ) 2041 { 2042 AF_LOG(( "SERIF_ANCHOR: edge %d (opos=%.2f) snapped to (%.2f)\n", 2043 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2044 edge->pos = FT_PIX_ROUND( edge->opos ); 2045 anchor = edge; 2046 } 2047 else 2048 { 2049 AF_Edge before, after; 2050 2051 2052 for ( before = edge - 1; before >= edges; before-- ) 2053 if ( before->flags & AF_EDGE_DONE ) 2054 break; 2055 2056 for ( after = edge + 1; after < edge_limit; after++ ) 2057 if ( after->flags & AF_EDGE_DONE ) 2058 break; 2059 2060 if ( before >= edges && before < edge && 2061 after < edge_limit && after > edge ) 2062 { 2063 if ( after->opos == before->opos ) 2064 edge->pos = before->pos; 2065 else 2066 edge->pos = before->pos + 2067 FT_MulDiv( edge->opos - before->opos, 2068 after->pos - before->pos, 2069 after->opos - before->opos ); 2070 AF_LOG(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f) " 2071 "from %d (opos=%.2f)\n", 2072 edge-edges, edge->opos / 64.0, 2073 edge->pos / 64.0, before - edges, 2074 before->opos / 64.0 )); 2075 } 2076 else 2077 { 2078 edge->pos = anchor->pos + 2079 ( ( edge->opos - anchor->opos + 16 ) & ~31 ); 2080 AF_LOG(( "SERIF_LINK2: edge %d (opos=%.2f) snapped to (%.2f)\n", 2081 edge-edges, edge->opos / 64.0, edge->pos / 64.0 )); 2082 } 2083 } 2084 2085 edge->flags |= AF_EDGE_DONE; 2086 2087 if ( edge > edges && edge->pos < edge[-1].pos ) 2088 edge->pos = edge[-1].pos; 2089 2090 if ( edge + 1 < edge_limit && 2091 edge[1].flags & AF_EDGE_DONE && 2092 edge->pos > edge[1].pos ) 2093 edge->pos = edge[1].pos; 2094 } 2095 } 2096 } 2097 2098 2099 static FT_Error 2100 af_latin_hints_apply( AF_GlyphHints hints, 2101 FT_Outline* outline, 2102 AF_LatinMetrics metrics ) 2103 { 2104 FT_Error error; 2105 int dim; 2106 2107 2108 error = af_glyph_hints_reload( hints, outline, 1 ); 2109 if ( error ) 2110 goto Exit; 2111 2112 /* analyze glyph outline */ 2113 #ifdef AF_USE_WARPER 2114 if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT || 2115 AF_HINTS_DO_HORIZONTAL( hints ) ) 2116 #else 2117 if ( AF_HINTS_DO_HORIZONTAL( hints ) ) 2118 #endif 2119 { 2120 error = af_latin_hints_detect_features( hints, AF_DIMENSION_HORZ ); 2121 if ( error ) 2122 goto Exit; 2123 } 2124 2125 if ( AF_HINTS_DO_VERTICAL( hints ) ) 2126 { 2127 error = af_latin_hints_detect_features( hints, AF_DIMENSION_VERT ); 2128 if ( error ) 2129 goto Exit; 2130 2131 af_latin_hints_compute_blue_edges( hints, metrics ); 2132 } 2133 2134 /* grid-fit the outline */ 2135 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) 2136 { 2137 #ifdef AF_USE_WARPER 2138 if ( ( dim == AF_DIMENSION_HORZ && 2139 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) ) 2140 { 2141 AF_WarperRec warper; 2142 FT_Fixed scale; 2143 FT_Pos delta; 2144 2145 2146 af_warper_compute( &warper, hints, dim, &scale, &delta ); 2147 af_glyph_hints_scale_dim( hints, dim, scale, delta ); 2148 continue; 2149 } 2150 #endif 2151 2152 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || 2153 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) 2154 { 2155 af_latin_hint_edges( hints, (AF_Dimension)dim ); 2156 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim ); 2157 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); 2158 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); 2159 } 2160 } 2161 af_glyph_hints_save( hints, outline ); 2162 2163 Exit: 2164 return error; 2165 } 2166 2167 2168 /*************************************************************************/ 2169 /*************************************************************************/ 2170 /***** *****/ 2171 /***** L A T I N S C R I P T C L A S S *****/ 2172 /***** *****/ 2173 /*************************************************************************/ 2174 /*************************************************************************/ 2175 2176 2177 /* XXX: this should probably fine tuned to differentiate better between */ 2178 /* scripts... */ 2179 2180 static const AF_Script_UniRangeRec af_latin_uniranges[] = 2181 { 2182 AF_UNIRANGE_REC( 0x0020UL, 0x007FUL ), /* Basic Latin (no control chars) */ 2183 AF_UNIRANGE_REC( 0x00A0UL, 0x00FFUL ), /* Latin-1 Supplement (no control chars) */ 2184 AF_UNIRANGE_REC( 0x0100UL, 0x017FUL ), /* Latin Extended-A */ 2185 AF_UNIRANGE_REC( 0x0180UL, 0x024FUL ), /* Latin Extended-B */ 2186 AF_UNIRANGE_REC( 0x0250UL, 0x02AFUL ), /* IPA Extensions */ 2187 AF_UNIRANGE_REC( 0x02B0UL, 0x02FFUL ), /* Spacing Modifier Letters */ 2188 AF_UNIRANGE_REC( 0x0300UL, 0x036FUL ), /* Combining Diacritical Marks */ 2189 AF_UNIRANGE_REC( 0x0370UL, 0x03FFUL ), /* Greek and Coptic */ 2190 AF_UNIRANGE_REC( 0x0400UL, 0x04FFUL ), /* Cyrillic */ 2191 AF_UNIRANGE_REC( 0x0500UL, 0x052FUL ), /* Cyrillic Supplement */ 2192 AF_UNIRANGE_REC( 0x1D00UL, 0x1D7FUL ), /* Phonetic Extensions */ 2193 AF_UNIRANGE_REC( 0x1D80UL, 0x1DBFUL ), /* Phonetic Extensions Supplement */ 2194 AF_UNIRANGE_REC( 0x1DC0UL, 0x1DFFUL ), /* Combining Diacritical Marks Supplement */ 2195 AF_UNIRANGE_REC( 0x1E00UL, 0x1EFFUL ), /* Latin Extended Additional */ 2196 AF_UNIRANGE_REC( 0x1F00UL, 0x1FFFUL ), /* Greek Extended */ 2197 AF_UNIRANGE_REC( 0x2000UL, 0x206FUL ), /* General Punctuation */ 2198 AF_UNIRANGE_REC( 0x2070UL, 0x209FUL ), /* Superscripts and Subscripts */ 2199 AF_UNIRANGE_REC( 0x20A0UL, 0x20CFUL ), /* Currency Symbols */ 2200 AF_UNIRANGE_REC( 0x2150UL, 0x218FUL ), /* Number Forms */ 2201 AF_UNIRANGE_REC( 0x2460UL, 0x24FFUL ), /* Enclosed Alphanumerics */ 2202 AF_UNIRANGE_REC( 0x2C60UL, 0x2C7FUL ), /* Latin Extended-C */ 2203 AF_UNIRANGE_REC( 0x2DE0UL, 0x2DFFUL ), /* Cyrillic Extended-A */ 2204 AF_UNIRANGE_REC( 0xA640UL, 0xA69FUL ), /* Cyrillic Extended-B */ 2205 AF_UNIRANGE_REC( 0xA720UL, 0xA7FFUL ), /* Latin Extended-D */ 2206 AF_UNIRANGE_REC( 0xFB00UL, 0xFB06UL ), /* Alphab. Present. Forms (Latin Ligs) */ 2207 AF_UNIRANGE_REC( 0x1D400UL, 0x1D7FFUL ), /* Mathematical Alphanumeric Symbols */ 2208 AF_UNIRANGE_REC( 0UL, 0UL ) 2209 }; 2210 2211 2212 AF_DEFINE_SCRIPT_CLASS(af_latin_script_class, 2213 AF_SCRIPT_LATIN, 2214 af_latin_uniranges, 2215 2216 sizeof( AF_LatinMetricsRec ), 2217 2218 (AF_Script_InitMetricsFunc) af_latin_metrics_init, 2219 (AF_Script_ScaleMetricsFunc)af_latin_metrics_scale, 2220 (AF_Script_DoneMetricsFunc) NULL, 2221 2222 (AF_Script_InitHintsFunc) af_latin_hints_init, 2223 (AF_Script_ApplyHintsFunc) af_latin_hints_apply 2224 ) 2225 2226 2227 /* END */ 2228
