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* Sync the recent cmake branch changes.
[reactos.git] / lib / 3rdparty / freetype / src / autofit / aflatin2.c
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, 2010 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
9 /* */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
15 /* */
16 /***************************************************************************/
17
18
19 #include FT_ADVANCES_H
20
21 #include "aflatin.h"
22 #include "aflatin2.h"
23 #include "aferrors.h"
24
25
26 #ifdef AF_USE_WARPER
27 #include "afwarp.h"
28 #endif
29
30 FT_LOCAL_DEF( FT_Error )
31 af_latin2_hints_compute_segments( AF_GlyphHints hints,
32 AF_Dimension dim );
33
34 FT_LOCAL_DEF( void )
35 af_latin2_hints_link_segments( AF_GlyphHints hints,
36 AF_Dimension dim );
37
38 /*************************************************************************/
39 /*************************************************************************/
40 /***** *****/
41 /***** L A T I N G L O B A L M E T R I C S *****/
42 /***** *****/
43 /*************************************************************************/
44 /*************************************************************************/
45
46 FT_LOCAL_DEF( void )
47 af_latin2_metrics_init_widths( AF_LatinMetrics metrics,
48 FT_Face face,
49 FT_ULong charcode )
50 {
51 /* scan the array of segments in each direction */
52 AF_GlyphHintsRec hints[1];
53
54
55 af_glyph_hints_init( hints, face->memory );
56
57 metrics->axis[AF_DIMENSION_HORZ].width_count = 0;
58 metrics->axis[AF_DIMENSION_VERT].width_count = 0;
59
60 {
61 FT_Error error;
62 FT_UInt glyph_index;
63 int dim;
64 AF_LatinMetricsRec dummy[1];
65 AF_Scaler scaler = &dummy->root.scaler;
66
67
68 glyph_index = FT_Get_Char_Index( face, charcode );
69 if ( glyph_index == 0 )
70 goto Exit;
71
72 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
73 if ( error || face->glyph->outline.n_points <= 0 )
74 goto Exit;
75
76 FT_ZERO( dummy );
77
78 dummy->units_per_em = metrics->units_per_em;
79 scaler->x_scale = scaler->y_scale = 0x10000L;
80 scaler->x_delta = scaler->y_delta = 0;
81 scaler->face = face;
82 scaler->render_mode = FT_RENDER_MODE_NORMAL;
83 scaler->flags = 0;
84
85 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)dummy );
86
87 error = af_glyph_hints_reload( hints, &face->glyph->outline );
88 if ( error )
89 goto Exit;
90
91 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
92 {
93 AF_LatinAxis axis = &metrics->axis[dim];
94 AF_AxisHints axhints = &hints->axis[dim];
95 AF_Segment seg, limit, link;
96 FT_UInt num_widths = 0;
97
98
99 error = af_latin2_hints_compute_segments( hints,
100 (AF_Dimension)dim );
101 if ( error )
102 goto Exit;
103
104 af_latin2_hints_link_segments( hints,
105 (AF_Dimension)dim );
106
107 seg = axhints->segments;
108 limit = seg + axhints->num_segments;
109
110 for ( ; seg < limit; seg++ )
111 {
112 link = seg->link;
113
114 /* we only consider stem segments there! */
115 if ( link && link->link == seg && link > seg )
116 {
117 FT_Pos dist;
118
119
120 dist = seg->pos - link->pos;
121 if ( dist < 0 )
122 dist = -dist;
123
124 if ( num_widths < AF_LATIN_MAX_WIDTHS )
125 axis->widths[ num_widths++ ].org = dist;
126 }
127 }
128
129 af_sort_widths( num_widths, axis->widths );
130 axis->width_count = num_widths;
131 }
132
133 Exit:
134 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
135 {
136 AF_LatinAxis axis = &metrics->axis[dim];
137 FT_Pos stdw;
138
139
140 stdw = ( axis->width_count > 0 )
141 ? axis->widths[0].org
142 : AF_LATIN_CONSTANT( metrics, 50 );
143
144 /* let's try 20% of the smallest width */
145 axis->edge_distance_threshold = stdw / 5;
146 axis->standard_width = stdw;
147 axis->extra_light = 0;
148 }
149 }
150
151 af_glyph_hints_done( hints );
152 }
153
154
155
156 #define AF_LATIN_MAX_TEST_CHARACTERS 12
157
158
159 static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES][AF_LATIN_MAX_TEST_CHARACTERS+1] =
160 {
161 "THEZOCQS",
162 "HEZLOCUS",
163 "fijkdbh",
164 "xzroesc",
165 "xzroesc",
166 "pqgjy"
167 };
168
169
170 static void
171 af_latin2_metrics_init_blues( AF_LatinMetrics metrics,
172 FT_Face face )
173 {
174 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS];
175 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS];
176 FT_Int num_flats;
177 FT_Int num_rounds;
178 FT_Int bb;
179 AF_LatinBlue blue;
180 FT_Error error;
181 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT];
182 FT_GlyphSlot glyph = face->glyph;
183
184
185 /* we compute the blues simply by loading each character from the */
186 /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */
187 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */
188
189 AF_LOG(( "blue zones computation\n" ));
190 AF_LOG(( "------------------------------------------------\n" ));
191
192 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
193 {
194 const char* p = af_latin2_blue_chars[bb];
195 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS;
196 FT_Pos* blue_ref;
197 FT_Pos* blue_shoot;
198
199
200 AF_LOG(( "blue %3d: ", bb ));
201
202 num_flats = 0;
203 num_rounds = 0;
204
205 for ( ; p < limit && *p; p++ )
206 {
207 FT_UInt glyph_index;
208 FT_Int best_point, best_y, best_first, best_last;
209 FT_Vector* points;
210 FT_Bool round;
211
212
213 AF_LOG(( "'%c'", *p ));
214
215 /* load the character in the face -- skip unknown or empty ones */
216 glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p );
217 if ( glyph_index == 0 )
218 continue;
219
220 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
221 if ( error || glyph->outline.n_points <= 0 )
222 continue;
223
224 /* now compute min or max point indices and coordinates */
225 points = glyph->outline.points;
226 best_point = -1;
227 best_y = 0; /* make compiler happy */
228 best_first = 0; /* ditto */
229 best_last = 0; /* ditto */
230
231 {
232 FT_Int nn;
233 FT_Int first = 0;
234 FT_Int last = -1;
235
236
237 for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ )
238 {
239 FT_Int old_best_point = best_point;
240 FT_Int pp;
241
242
243 last = glyph->outline.contours[nn];
244
245 /* Avoid single-point contours since they are never rasterized. */
246 /* In some fonts, they correspond to mark attachment points */
247 /* which are way outside of the glyph's real outline. */
248 if ( last == first )
249 continue;
250
251 if ( AF_LATIN_IS_TOP_BLUE( bb ) )
252 {
253 for ( pp = first; pp <= last; pp++ )
254 if ( best_point < 0 || points[pp].y > best_y )
255 {
256 best_point = pp;
257 best_y = points[pp].y;
258 }
259 }
260 else
261 {
262 for ( pp = first; pp <= last; pp++ )
263 if ( best_point < 0 || points[pp].y < best_y )
264 {
265 best_point = pp;
266 best_y = points[pp].y;
267 }
268 }
269
270 if ( best_point != old_best_point )
271 {
272 best_first = first;
273 best_last = last;
274 }
275 }
276 AF_LOG(( "%5d", best_y ));
277 }
278
279 /* now check whether the point belongs to a straight or round */
280 /* segment; we first need to find in which contour the extremum */
281 /* lies, then inspect its previous and next points */
282 {
283 FT_Int start, end, prev, next;
284 FT_Pos dist;
285
286
287 /* now look for the previous and next points that are not on the */
288 /* same Y coordinate. Threshold the `closeness'... */
289 start = end = best_point;
290
291 do
292 {
293 prev = start-1;
294 if ( prev < best_first )
295 prev = best_last;
296
297 dist = points[prev].y - best_y;
298 if ( dist < -5 || dist > 5 )
299 break;
300
301 start = prev;
302
303 } while ( start != best_point );
304
305 do
306 {
307 next = end+1;
308 if ( next > best_last )
309 next = best_first;
310
311 dist = points[next].y - best_y;
312 if ( dist < -5 || dist > 5 )
313 break;
314
315 end = next;
316
317 } while ( end != best_point );
318
319 /* now, set the `round' flag depending on the segment's kind */
320 round = FT_BOOL(
321 FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON ||
322 FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON );
323
324 AF_LOG(( "%c ", round ? 'r' : 'f' ));
325 }
326
327 if ( round )
328 rounds[num_rounds++] = best_y;
329 else
330 flats[num_flats++] = best_y;
331 }
332
333 AF_LOG(( "\n" ));
334
335 if ( num_flats == 0 && num_rounds == 0 )
336 {
337 /*
338 * we couldn't find a single glyph to compute this blue zone,
339 * we will simply ignore it then
340 */
341 AF_LOG(( "empty\n" ));
342 continue;
343 }
344
345 /* we have computed the contents of the `rounds' and `flats' tables, */
346 /* now determine the reference and overshoot position of the blue -- */
347 /* we simply take the median value after a simple sort */
348 af_sort_pos( num_rounds, rounds );
349 af_sort_pos( num_flats, flats );
350
351 blue = & axis->blues[axis->blue_count];
352 blue_ref = & blue->ref.org;
353 blue_shoot = & blue->shoot.org;
354
355 axis->blue_count++;
356
357 if ( num_flats == 0 )
358 {
359 *blue_ref =
360 *blue_shoot = rounds[num_rounds / 2];
361 }
362 else if ( num_rounds == 0 )
363 {
364 *blue_ref =
365 *blue_shoot = flats[num_flats / 2];
366 }
367 else
368 {
369 *blue_ref = flats[num_flats / 2];
370 *blue_shoot = rounds[num_rounds / 2];
371 }
372
373 /* there are sometimes problems: if the overshoot position of top */
374 /* zones is under its reference position, or the opposite for bottom */
375 /* zones. We must thus check everything there and correct the errors */
376 if ( *blue_shoot != *blue_ref )
377 {
378 FT_Pos ref = *blue_ref;
379 FT_Pos shoot = *blue_shoot;
380 FT_Bool over_ref = FT_BOOL( shoot > ref );
381
382
383 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref )
384 *blue_shoot = *blue_ref = ( shoot + ref ) / 2;
385 }
386
387 blue->flags = 0;
388 if ( AF_LATIN_IS_TOP_BLUE( bb ) )
389 blue->flags |= AF_LATIN_BLUE_TOP;
390
391 /*
392 * The following flags is used later to adjust the y and x scales
393 * in order to optimize the pixel grid alignment of the top of small
394 * letters.
395 */
396 if ( bb == AF_LATIN_BLUE_SMALL_TOP )
397 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT;
398
399 AF_LOG(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot ));
400 }
401
402 return;
403 }
404
405
406 FT_LOCAL_DEF( void )
407 af_latin2_metrics_check_digits( AF_LatinMetrics metrics,
408 FT_Face face )
409 {
410 FT_UInt i;
411 FT_Bool started = 0, same_width = 1;
412 FT_Fixed advance, old_advance = 0;
413
414
415 /* check whether all ASCII digits have the same advance width; */
416 /* digit `0' is 0x30 in all supported charmaps */
417 for ( i = 0x30; i <= 0x39; i++ )
418 {
419 FT_UInt glyph_index;
420
421
422 glyph_index = FT_Get_Char_Index( face, i );
423 if ( glyph_index == 0 )
424 continue;
425
426 if ( FT_Get_Advance( face, glyph_index,
427 FT_LOAD_NO_SCALE |
428 FT_LOAD_NO_HINTING |
429 FT_LOAD_IGNORE_TRANSFORM,
430 &advance ) )
431 continue;
432
433 if ( started )
434 {
435 if ( advance != old_advance )
436 {
437 same_width = 0;
438 break;
439 }
440 }
441 else
442 {
443 old_advance = advance;
444 started = 1;
445 }
446 }
447
448 metrics->root.digits_have_same_width = same_width;
449 }
450
451
452 FT_LOCAL_DEF( FT_Error )
453 af_latin2_metrics_init( AF_LatinMetrics metrics,
454 FT_Face face )
455 {
456 FT_Error error = AF_Err_Ok;
457 FT_CharMap oldmap = face->charmap;
458 FT_UInt ee;
459
460 static const FT_Encoding latin_encodings[] =
461 {
462 FT_ENCODING_UNICODE,
463 FT_ENCODING_APPLE_ROMAN,
464 FT_ENCODING_ADOBE_STANDARD,
465 FT_ENCODING_ADOBE_LATIN_1,
466 FT_ENCODING_NONE /* end of list */
467 };
468
469
470 metrics->units_per_em = face->units_per_EM;
471
472 /* do we have a latin charmap in there? */
473 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ )
474 {
475 error = FT_Select_Charmap( face, latin_encodings[ee] );
476 if ( !error )
477 break;
478 }
479
480 if ( !error )
481 {
482 /* For now, compute the standard width and height from the `o'. */
483 af_latin2_metrics_init_widths( metrics, face, 'o' );
484 af_latin2_metrics_init_blues( metrics, face );
485 af_latin2_metrics_check_digits( metrics, face );
486 }
487
488 FT_Set_Charmap( face, oldmap );
489 return AF_Err_Ok;
490 }
491
492
493 static void
494 af_latin2_metrics_scale_dim( AF_LatinMetrics metrics,
495 AF_Scaler scaler,
496 AF_Dimension dim )
497 {
498 FT_Fixed scale;
499 FT_Pos delta;
500 AF_LatinAxis axis;
501 FT_UInt nn;
502
503
504 if ( dim == AF_DIMENSION_HORZ )
505 {
506 scale = scaler->x_scale;
507 delta = scaler->x_delta;
508 }
509 else
510 {
511 scale = scaler->y_scale;
512 delta = scaler->y_delta;
513 }
514
515 axis = &metrics->axis[dim];
516
517 if ( axis->org_scale == scale && axis->org_delta == delta )
518 return;
519
520 axis->org_scale = scale;
521 axis->org_delta = delta;
522
523 /*
524 * correct Y scale to optimize the alignment of the top of small
525 * letters to the pixel grid
526 */
527 if ( dim == AF_DIMENSION_VERT )
528 {
529 AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT];
530 AF_LatinBlue blue = NULL;
531
532
533 for ( nn = 0; nn < vaxis->blue_count; nn++ )
534 {
535 if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT )
536 {
537 blue = &vaxis->blues[nn];
538 break;
539 }
540 }
541
542 if ( blue )
543 {
544 FT_Pos scaled = FT_MulFix( blue->shoot.org, scaler->y_scale );
545 FT_Pos fitted = ( scaled + 40 ) & ~63;
546
547 #if 1
548 if ( scaled != fitted )
549 {
550 scale = FT_MulDiv( scale, fitted, scaled );
551 AF_LOG(( "== scaled x-top = %.2g fitted = %.2g, scaling = %.4g\n", scaled/64.0, fitted/64.0, (fitted*1.0)/scaled ));
552 }
553 #endif
554 }
555 }
556
557 axis->scale = scale;
558 axis->delta = delta;
559
560 if ( dim == AF_DIMENSION_HORZ )
561 {
562 metrics->root.scaler.x_scale = scale;
563 metrics->root.scaler.x_delta = delta;
564 }
565 else
566 {
567 metrics->root.scaler.y_scale = scale;
568 metrics->root.scaler.y_delta = delta;
569 }
570
571 /* scale the standard widths */
572 for ( nn = 0; nn < axis->width_count; nn++ )
573 {
574 AF_Width width = axis->widths + nn;
575
576
577 width->cur = FT_MulFix( width->org, scale );
578 width->fit = width->cur;
579 }
580
581 /* an extra-light axis corresponds to a standard width that is */
582 /* smaller than 0.75 pixels */
583 axis->extra_light =
584 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );
585
586 if ( dim == AF_DIMENSION_VERT )
587 {
588 /* scale the blue zones */
589 for ( nn = 0; nn < axis->blue_count; nn++ )
590 {
591 AF_LatinBlue blue = &axis->blues[nn];
592 FT_Pos dist;
593
594
595 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
596 blue->ref.fit = blue->ref.cur;
597 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
598 blue->shoot.fit = blue->shoot.cur;
599 blue->flags &= ~AF_LATIN_BLUE_ACTIVE;
600
601 /* a blue zone is only active if it is less than 3/4 pixels tall */
602 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
603 if ( dist <= 48 && dist >= -48 )
604 {
605 FT_Pos delta1, delta2;
606
607 delta1 = blue->shoot.org - blue->ref.org;
608 delta2 = delta1;
609 if ( delta1 < 0 )
610 delta2 = -delta2;
611
612 delta2 = FT_MulFix( delta2, scale );
613
614 if ( delta2 < 32 )
615 delta2 = 0;
616 else if ( delta2 < 64 )
617 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
618 else
619 delta2 = FT_PIX_ROUND( delta2 );
620
621 if ( delta1 < 0 )
622 delta2 = -delta2;
623
624 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
625 blue->shoot.fit = blue->ref.fit + delta2;
626
627 AF_LOG(( ">> activating blue zone %d: ref.cur=%.2g ref.fit=%.2g shoot.cur=%.2g shoot.fit=%.2g\n",
628 nn, blue->ref.cur/64.0, blue->ref.fit/64.0,
629 blue->shoot.cur/64.0, blue->shoot.fit/64.0 ));
630
631 blue->flags |= AF_LATIN_BLUE_ACTIVE;
632 }
633 }
634 }
635 }
636
637
638 FT_LOCAL_DEF( void )
639 af_latin2_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_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
646 af_latin2_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 #define SORT_SEGMENTS
659
660 FT_LOCAL_DEF( FT_Error )
661 af_latin2_hints_compute_segments( AF_GlyphHints hints,
662 AF_Dimension dim )
663 {
664 AF_AxisHints axis = &hints->axis[dim];
665 FT_Memory memory = hints->memory;
666 FT_Error error = AF_Err_Ok;
667 AF_Segment segment = NULL;
668 AF_SegmentRec seg0;
669 AF_Point* contour = hints->contours;
670 AF_Point* contour_limit = contour + hints->num_contours;
671 AF_Direction major_dir, segment_dir;
672
673
674 FT_ZERO( &seg0 );
675 seg0.score = 32000;
676 seg0.flags = AF_EDGE_NORMAL;
677
678 major_dir = (AF_Direction)FT_ABS( axis->major_dir );
679 segment_dir = major_dir;
680
681 axis->num_segments = 0;
682
683 /* set up (u,v) in each point */
684 if ( dim == AF_DIMENSION_HORZ )
685 {
686 AF_Point point = hints->points;
687 AF_Point limit = point + hints->num_points;
688
689
690 for ( ; point < limit; point++ )
691 {
692 point->u = point->fx;
693 point->v = point->fy;
694 }
695 }
696 else
697 {
698 AF_Point point = hints->points;
699 AF_Point limit = point + hints->num_points;
700
701
702 for ( ; point < limit; point++ )
703 {
704 point->u = point->fy;
705 point->v = point->fx;
706 }
707 }
708
709 /* do each contour separately */
710 for ( ; contour < contour_limit; contour++ )
711 {
712 AF_Point point = contour[0];
713 AF_Point start = point;
714 AF_Point last = point->prev;
715
716
717 if ( point == last ) /* skip singletons -- just in case */
718 continue;
719
720 /* already on an edge ?, backtrack to find its start */
721 if ( FT_ABS( point->in_dir ) == major_dir )
722 {
723 point = point->prev;
724
725 while ( point->in_dir == start->in_dir )
726 point = point->prev;
727 }
728 else /* otherwise, find first segment start, if any */
729 {
730 while ( FT_ABS( point->out_dir ) != major_dir )
731 {
732 point = point->next;
733
734 if ( point == start )
735 goto NextContour;
736 }
737 }
738
739 start = point;
740
741 for (;;)
742 {
743 AF_Point first;
744 FT_Pos min_u, min_v, max_u, max_v;
745
746 /* we're at the start of a new segment */
747 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir &&
748 point->in_dir != point->out_dir );
749 first = point;
750
751 min_u = max_u = point->u;
752 min_v = max_v = point->v;
753
754 point = point->next;
755
756 while ( point->out_dir == first->out_dir )
757 {
758 point = point->next;
759
760 if ( point->u < min_u )
761 min_u = point->u;
762
763 if ( point->u > max_u )
764 max_u = point->u;
765 }
766
767 if ( point->v < min_v )
768 min_v = point->v;
769
770 if ( point->v > max_v )
771 max_v = point->v;
772
773 /* record new segment */
774 error = af_axis_hints_new_segment( axis, memory, &segment );
775 if ( error )
776 goto Exit;
777
778 segment[0] = seg0;
779 segment->dir = first->out_dir;
780 segment->first = first;
781 segment->last = point;
782 segment->contour = contour;
783 segment->pos = (FT_Short)(( min_u + max_u ) >> 1);
784 segment->min_coord = (FT_Short) min_v;
785 segment->max_coord = (FT_Short) max_v;
786 segment->height = (FT_Short)(max_v - min_v);
787
788 /* a segment is round if it doesn't have successive */
789 /* on-curve points. */
790 {
791 AF_Point pt = first;
792 AF_Point last = point;
793 AF_Flags f0 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
794 AF_Flags f1;
795
796
797 segment->flags &= ~AF_EDGE_ROUND;
798
799 for ( ; pt != last; f0 = f1 )
800 {
801 pt = pt->next;
802 f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
803
804 if ( !f0 && !f1 )
805 break;
806
807 if ( pt == last )
808 segment->flags |= AF_EDGE_ROUND;
809 }
810 }
811
812 /* this can happen in the case of a degenerate contour
813 * e.g. a 2-point vertical contour
814 */
815 if ( point == start )
816 break;
817
818 /* jump to the start of the next segment, if any */
819 while ( FT_ABS(point->out_dir) != major_dir )
820 {
821 point = point->next;
822
823 if ( point == start )
824 goto NextContour;
825 }
826 }
827
828 NextContour:
829 ;
830 } /* contours */
831
832 /* now slightly increase the height of segments when this makes */
833 /* sense -- this is used to better detect and ignore serifs */
834 {
835 AF_Segment segments = axis->segments;
836 AF_Segment segments_end = segments + axis->num_segments;
837
838
839 for ( segment = segments; segment < segments_end; segment++ )
840 {
841 AF_Point first = segment->first;
842 AF_Point last = segment->last;
843 AF_Point p;
844 FT_Pos first_v = first->v;
845 FT_Pos last_v = last->v;
846
847
848 if ( first == last )
849 continue;
850
851 if ( first_v < last_v )
852 {
853 p = first->prev;
854 if ( p->v < first_v )
855 segment->height = (FT_Short)( segment->height +
856 ( ( first_v - p->v ) >> 1 ) );
857
858 p = last->next;
859 if ( p->v > last_v )
860 segment->height = (FT_Short)( segment->height +
861 ( ( p->v - last_v ) >> 1 ) );
862 }
863 else
864 {
865 p = first->prev;
866 if ( p->v > first_v )
867 segment->height = (FT_Short)( segment->height +
868 ( ( p->v - first_v ) >> 1 ) );
869
870 p = last->next;
871 if ( p->v < last_v )
872 segment->height = (FT_Short)( segment->height +
873 ( ( last_v - p->v ) >> 1 ) );
874 }
875 }
876 }
877
878 #ifdef AF_SORT_SEGMENTS
879 /* place all segments with a negative direction to the start
880 * of the array, used to speed up segment linking later...
881 */
882 {
883 AF_Segment segments = axis->segments;
884 FT_UInt count = axis->num_segments;
885 FT_UInt ii, jj;
886
887 for (ii = 0; ii < count; ii++)
888 {
889 if ( segments[ii].dir > 0 )
890 {
891 for (jj = ii+1; jj < count; jj++)
892 {
893 if ( segments[jj].dir < 0 )
894 {
895 AF_SegmentRec tmp;
896
897 tmp = segments[ii];
898 segments[ii] = segments[jj];
899 segments[jj] = tmp;
900
901 break;
902 }
903 }
904
905 if ( jj == count )
906 break;
907 }
908 }
909 axis->mid_segments = ii;
910 }
911 #endif
912
913 Exit:
914 return error;
915 }
916
917
918 FT_LOCAL_DEF( void )
919 af_latin2_hints_link_segments( AF_GlyphHints hints,
920 AF_Dimension dim )
921 {
922 AF_AxisHints axis = &hints->axis[dim];
923 AF_Segment segments = axis->segments;
924 AF_Segment segment_limit = segments + axis->num_segments;
925 #ifdef AF_SORT_SEGMENTS
926 AF_Segment segment_mid = segments + axis->mid_segments;
927 #endif
928 FT_Pos len_threshold, len_score;
929 AF_Segment seg1, seg2;
930
931
932 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
933 if ( len_threshold == 0 )
934 len_threshold = 1;
935
936 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 );
937
938 #ifdef AF_SORT_SEGMENTS
939 for ( seg1 = segments; seg1 < segment_mid; seg1++ )
940 {
941 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
942 continue;
943
944 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ )
945 #else
946 /* now compare each segment to the others */
947 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
948 {
949 /* the fake segments are introduced to hint the metrics -- */
950 /* we must never link them to anything */
951 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
952 continue;
953
954 for ( seg2 = segments; seg2 < segment_limit; seg2++ )
955 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )
956 #endif
957 {
958 FT_Pos pos1 = seg1->pos;
959 FT_Pos pos2 = seg2->pos;
960 FT_Pos dist = pos2 - pos1;
961
962
963 if ( dist < 0 )
964 continue;
965
966 {
967 FT_Pos min = seg1->min_coord;
968 FT_Pos max = seg1->max_coord;
969 FT_Pos len, score;
970
971
972 if ( min < seg2->min_coord )
973 min = seg2->min_coord;
974
975 if ( max > seg2->max_coord )
976 max = seg2->max_coord;
977
978 len = max - min;
979 if ( len >= len_threshold )
980 {
981 score = dist + len_score / len;
982 if ( score < seg1->score )
983 {
984 seg1->score = score;
985 seg1->link = seg2;
986 }
987
988 if ( score < seg2->score )
989 {
990 seg2->score = score;
991 seg2->link = seg1;
992 }
993 }
994 }
995 }
996 }
997 #if 0
998 }
999 #endif
1000
1001 /* now, compute the `serif' segments */
1002 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
1003 {
1004 seg2 = seg1->link;
1005
1006 if ( seg2 )
1007 {
1008 if ( seg2->link != seg1 )
1009 {
1010 seg1->link = 0;
1011 seg1->serif = seg2->link;
1012 }
1013 }
1014 }
1015 }
1016
1017
1018 FT_LOCAL_DEF( FT_Error )
1019 af_latin2_hints_compute_edges( AF_GlyphHints hints,
1020 AF_Dimension dim )
1021 {
1022 AF_AxisHints axis = &hints->axis[dim];
1023 FT_Error error = AF_Err_Ok;
1024 FT_Memory memory = hints->memory;
1025 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim];
1026
1027 AF_Segment segments = axis->segments;
1028 AF_Segment segment_limit = segments + axis->num_segments;
1029 AF_Segment seg;
1030
1031 AF_Direction up_dir;
1032 FT_Fixed scale;
1033 FT_Pos edge_distance_threshold;
1034 FT_Pos segment_length_threshold;
1035
1036
1037 axis->num_edges = 0;
1038
1039 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
1040 : hints->y_scale;
1041
1042 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP
1043 : AF_DIR_RIGHT;
1044
1045 /*
1046 * We want to ignore very small (mostly serif) segments, we do that
1047 * by ignoring those that whose length is less than a given fraction
1048 * of the standard width. If there is no standard width, we ignore
1049 * those that are less than a given size in pixels
1050 *
1051 * also, unlink serif segments that are linked to segments farther
1052 * than 50% of the standard width
1053 */
1054 if ( dim == AF_DIMENSION_HORZ )
1055 {
1056 if ( laxis->width_count > 0 )
1057 segment_length_threshold = (laxis->standard_width * 10 ) >> 4;
1058 else
1059 segment_length_threshold = FT_DivFix( 64, hints->y_scale );
1060 }
1061 else
1062 segment_length_threshold = 0;
1063
1064 /*********************************************************************/
1065 /* */
1066 /* We will begin by generating a sorted table of edges for the */
1067 /* current direction. To do so, we simply scan each segment and try */
1068 /* to find an edge in our table that corresponds to its position. */
1069 /* */
1070 /* If no edge is found, we create and insert a new edge in the */
1071 /* sorted table. Otherwise, we simply add the segment to the edge's */
1072 /* list which will be processed in the second step to compute the */
1073 /* edge's properties. */
1074 /* */
1075 /* Note that the edges table is sorted along the segment/edge */
1076 /* position. */
1077 /* */
1078 /*********************************************************************/
1079
1080 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
1081 scale );
1082 if ( edge_distance_threshold > 64 / 4 )
1083 edge_distance_threshold = 64 / 4;
1084
1085 edge_distance_threshold = FT_DivFix( edge_distance_threshold,
1086 scale );
1087
1088 for ( seg = segments; seg < segment_limit; seg++ )
1089 {
1090 AF_Edge found = 0;
1091 FT_Int ee;
1092
1093
1094 if ( seg->height < segment_length_threshold )
1095 continue;
1096
1097 /* A special case for serif edges: If they are smaller than */
1098 /* 1.5 pixels we ignore them. */
1099 if ( seg->serif )
1100 {
1101 FT_Pos dist = seg->serif->pos - seg->pos;
1102
1103 if (dist < 0)
1104 dist = -dist;
1105
1106 if (dist >= laxis->standard_width >> 1)
1107 {
1108 /* unlink this serif, it is too distant from its reference stem */
1109 seg->serif = NULL;
1110 }
1111 else if ( 2*seg->height < 3 * segment_length_threshold )
1112 continue;
1113 }
1114
1115 /* look for an edge corresponding to the segment */
1116 for ( ee = 0; ee < axis->num_edges; ee++ )
1117 {
1118 AF_Edge edge = axis->edges + ee;
1119 FT_Pos dist;
1120
1121
1122 dist = seg->pos - edge->fpos;
1123 if ( dist < 0 )
1124 dist = -dist;
1125
1126 if ( dist < edge_distance_threshold && edge->dir == seg->dir )
1127 {
1128 found = edge;
1129 break;
1130 }
1131 }
1132
1133 if ( !found )
1134 {
1135 AF_Edge edge;
1136
1137
1138 /* insert a new edge in the list and */
1139 /* sort according to the position */
1140 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, memory, &edge );
1141 if ( error )
1142 goto Exit;
1143
1144 /* add the segment to the new edge's list */
1145 FT_ZERO( edge );
1146
1147 edge->first = seg;
1148 edge->last = seg;
1149 edge->fpos = seg->pos;
1150 edge->dir = seg->dir;
1151 edge->opos = edge->pos = FT_MulFix( seg->pos, scale );
1152 seg->edge_next = seg;
1153 }
1154 else
1155 {
1156 /* if an edge was found, simply add the segment to the edge's */
1157 /* list */
1158 seg->edge_next = found->first;
1159 found->last->edge_next = seg;
1160 found->last = seg;
1161 }
1162 }
1163
1164
1165 /*********************************************************************/
1166 /* */
1167 /* Good, we will now compute each edge's properties according to */
1168 /* segments found on its position. Basically, these are: */
1169 /* */
1170 /* - edge's main direction */
1171 /* - stem edge, serif edge or both (which defaults to stem then) */
1172 /* - rounded edge, straight or both (which defaults to straight) */
1173 /* - link for edge */
1174 /* */
1175 /*********************************************************************/
1176
1177 /* first of all, set the `edge' field in each segment -- this is */
1178 /* required in order to compute edge links */
1179
1180 /*
1181 * Note that removing this loop and setting the `edge' field of each
1182 * segment directly in the code above slows down execution speed for
1183 * some reasons on platforms like the Sun.
1184 */
1185 {
1186 AF_Edge edges = axis->edges;
1187 AF_Edge edge_limit = edges + axis->num_edges;
1188 AF_Edge edge;
1189
1190
1191 for ( edge = edges; edge < edge_limit; edge++ )
1192 {
1193 seg = edge->first;
1194 if ( seg )
1195 do
1196 {
1197 seg->edge = edge;
1198 seg = seg->edge_next;
1199
1200 } while ( seg != edge->first );
1201 }
1202
1203 /* now, compute each edge properties */
1204 for ( edge = edges; edge < edge_limit; edge++ )
1205 {
1206 FT_Int is_round = 0; /* does it contain round segments? */
1207 FT_Int is_straight = 0; /* does it contain straight segments? */
1208 FT_Pos ups = 0; /* number of upwards segments */
1209 FT_Pos downs = 0; /* number of downwards segments */
1210
1211
1212 seg = edge->first;
1213
1214 do
1215 {
1216 FT_Bool is_serif;
1217
1218
1219 /* check for roundness of segment */
1220 if ( seg->flags & AF_EDGE_ROUND )
1221 is_round++;
1222 else
1223 is_straight++;
1224
1225 /* check for segment direction */
1226 if ( seg->dir == up_dir )
1227 ups += seg->max_coord-seg->min_coord;
1228 else
1229 downs += seg->max_coord-seg->min_coord;
1230
1231 /* check for links -- if seg->serif is set, then seg->link must */
1232 /* be ignored */
1233 is_serif = (FT_Bool)( seg->serif &&
1234 seg->serif->edge &&
1235 seg->serif->edge != edge );
1236
1237 if ( ( seg->link && seg->link->edge != NULL ) || is_serif )
1238 {
1239 AF_Edge edge2;
1240 AF_Segment seg2;
1241
1242
1243 edge2 = edge->link;
1244 seg2 = seg->link;
1245
1246 if ( is_serif )
1247 {
1248 seg2 = seg->serif;
1249 edge2 = edge->serif;
1250 }
1251
1252 if ( edge2 )
1253 {
1254 FT_Pos edge_delta;
1255 FT_Pos seg_delta;
1256
1257
1258 edge_delta = edge->fpos - edge2->fpos;
1259 if ( edge_delta < 0 )
1260 edge_delta = -edge_delta;
1261
1262 seg_delta = seg->pos - seg2->pos;
1263 if ( seg_delta < 0 )
1264 seg_delta = -seg_delta;
1265
1266 if ( seg_delta < edge_delta )
1267 edge2 = seg2->edge;
1268 }
1269 else
1270 edge2 = seg2->edge;
1271
1272 if ( is_serif )
1273 {
1274 edge->serif = edge2;
1275 edge2->flags |= AF_EDGE_SERIF;
1276 }
1277 else
1278 edge->link = edge2;
1279 }
1280
1281 seg = seg->edge_next;
1282
1283 } while ( seg != edge->first );
1284
1285 /* set the round/straight flags */
1286 edge->flags = AF_EDGE_NORMAL;
1287
1288 if ( is_round > 0 && is_round >= is_straight )
1289 edge->flags |= AF_EDGE_ROUND;
1290
1291 #if 0
1292 /* set the edge's main direction */
1293 edge->dir = AF_DIR_NONE;
1294
1295 if ( ups > downs )
1296 edge->dir = (FT_Char)up_dir;
1297
1298 else if ( ups < downs )
1299 edge->dir = (FT_Char)-up_dir;
1300
1301 else if ( ups == downs )
1302 edge->dir = 0; /* both up and down! */
1303 #endif
1304
1305 /* gets rid of serifs if link is set */
1306 /* XXX: This gets rid of many unpleasant artefacts! */
1307 /* Example: the `c' in cour.pfa at size 13 */
1308
1309 if ( edge->serif && edge->link )
1310 edge->serif = 0;
1311 }
1312 }
1313
1314 Exit:
1315 return error;
1316 }
1317
1318
1319 FT_LOCAL_DEF( FT_Error )
1320 af_latin2_hints_detect_features( AF_GlyphHints hints,
1321 AF_Dimension dim )
1322 {
1323 FT_Error error;
1324
1325
1326 error = af_latin2_hints_compute_segments( hints, dim );
1327 if ( !error )
1328 {
1329 af_latin2_hints_link_segments( hints, dim );
1330
1331 error = af_latin2_hints_compute_edges( hints, dim );
1332 }
1333 return error;
1334 }
1335
1336
1337 FT_LOCAL_DEF( void )
1338 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints,
1339 AF_LatinMetrics metrics )
1340 {
1341 AF_AxisHints axis = &hints->axis[ AF_DIMENSION_VERT ];
1342 AF_Edge edge = axis->edges;
1343 AF_Edge edge_limit = edge + axis->num_edges;
1344 AF_LatinAxis latin = &metrics->axis[ AF_DIMENSION_VERT ];
1345 FT_Fixed scale = latin->scale;
1346 FT_Pos best_dist0; /* initial threshold */
1347
1348
1349 /* compute the initial threshold as a fraction of the EM size */
1350 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
1351
1352 if ( best_dist0 > 64 / 2 )
1353 best_dist0 = 64 / 2;
1354
1355 /* compute which blue zones are active, i.e. have their scaled */
1356 /* size < 3/4 pixels */
1357
1358 /* for each horizontal edge search the blue zone which is closest */
1359 for ( ; edge < edge_limit; edge++ )
1360 {
1361 FT_Int bb;
1362 AF_Width best_blue = NULL;
1363 FT_Pos best_dist = best_dist0;
1364
1365 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
1366 {
1367 AF_LatinBlue blue = latin->blues + bb;
1368 FT_Bool is_top_blue, is_major_dir;
1369
1370
1371 /* skip inactive blue zones (i.e., those that are too small) */
1372 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) )
1373 continue;
1374
1375 /* if it is a top zone, check for right edges -- if it is a bottom */
1376 /* zone, check for left edges */
1377 /* */
1378 /* of course, that's for TrueType */
1379 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 );
1380 is_major_dir = FT_BOOL( edge->dir == axis->major_dir );
1381
1382 /* if it is a top zone, the edge must be against the major */
1383 /* direction; if it is a bottom zone, it must be in the major */
1384 /* direction */
1385 if ( is_top_blue ^ is_major_dir )
1386 {
1387 FT_Pos dist;
1388 AF_Width compare;
1389
1390
1391 /* if it's a rounded edge, compare it to the overshoot position */
1392 /* if it's a flat edge, compare it to the reference position */
1393 if ( edge->flags & AF_EDGE_ROUND )
1394 compare = &blue->shoot;
1395 else
1396 compare = &blue->ref;
1397
1398 dist = edge->fpos - compare->org;
1399 if (dist < 0)
1400 dist = -dist;
1401
1402 dist = FT_MulFix( dist, scale );
1403 if ( dist < best_dist )
1404 {
1405 best_dist = dist;
1406 best_blue = compare;
1407 }
1408
1409 #if 0
1410 /* now, compare it to the overshoot position if the edge is */
1411 /* rounded, and if the edge is over the reference position of a */
1412 /* top zone, or under the reference position of a bottom zone */
1413 if ( edge->flags & AF_EDGE_ROUND && dist != 0 )
1414 {
1415 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org );
1416
1417
1418 if ( is_top_blue ^ is_under_ref )
1419 {
1420 blue = latin->blues + bb;
1421 dist = edge->fpos - blue->shoot.org;
1422 if ( dist < 0 )
1423 dist = -dist;
1424
1425 dist = FT_MulFix( dist, scale );
1426 if ( dist < best_dist )
1427 {
1428 best_dist = dist;
1429 best_blue = & blue->shoot;
1430 }
1431 }
1432 }
1433 #endif
1434 }
1435 }
1436
1437 if ( best_blue )
1438 edge->blue_edge = best_blue;
1439 }
1440 }
1441
1442
1443 static FT_Error
1444 af_latin2_hints_init( AF_GlyphHints hints,
1445 AF_LatinMetrics metrics )
1446 {
1447 FT_Render_Mode mode;
1448 FT_UInt32 scaler_flags, other_flags;
1449 FT_Face face = metrics->root.scaler.face;
1450
1451
1452 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );
1453
1454 /*
1455 * correct x_scale and y_scale if needed, since they may have
1456 * been modified `af_latin2_metrics_scale_dim' above
1457 */
1458 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
1459 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
1460 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
1461 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
1462
1463 /* compute flags depending on render mode, etc. */
1464 mode = metrics->root.scaler.render_mode;
1465
1466 #if 0 /* #ifdef AF_USE_WARPER */
1467 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
1468 {
1469 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
1470 }
1471 #endif
1472
1473 scaler_flags = hints->scaler_flags;
1474 other_flags = 0;
1475
1476 /*
1477 * We snap the width of vertical stems for the monochrome and
1478 * horizontal LCD rendering targets only.
1479 */
1480 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
1481 other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
1482
1483 /*
1484 * We snap the width of horizontal stems for the monochrome and
1485 * vertical LCD rendering targets only.
1486 */
1487 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
1488 other_flags |= AF_LATIN_HINTS_VERT_SNAP;
1489
1490 /*
1491 * We adjust stems to full pixels only if we don't use the `light' mode.
1492 */
1493 if ( mode != FT_RENDER_MODE_LIGHT )
1494 other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
1495
1496 if ( mode == FT_RENDER_MODE_MONO )
1497 other_flags |= AF_LATIN_HINTS_MONO;
1498
1499 /*
1500 * In `light' hinting mode we disable horizontal hinting completely.
1501 * We also do it if the face is italic.
1502 */
1503 if ( mode == FT_RENDER_MODE_LIGHT ||
1504 (face->style_flags & FT_STYLE_FLAG_ITALIC) != 0 )
1505 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL;
1506
1507 hints->scaler_flags = scaler_flags;
1508 hints->other_flags = other_flags;
1509
1510 return 0;
1511 }
1512
1513
1514 /*************************************************************************/
1515 /*************************************************************************/
1516 /***** *****/
1517 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/
1518 /***** *****/
1519 /*************************************************************************/
1520 /*************************************************************************/
1521
1522 /* snap a given width in scaled coordinates to one of the */
1523 /* current standard widths */
1524
1525 static FT_Pos
1526 af_latin2_snap_width( AF_Width widths,
1527 FT_Int count,
1528 FT_Pos width )
1529 {
1530 int n;
1531 FT_Pos best = 64 + 32 + 2;
1532 FT_Pos reference = width;
1533 FT_Pos scaled;
1534
1535
1536 for ( n = 0; n < count; n++ )
1537 {
1538 FT_Pos w;
1539 FT_Pos dist;
1540
1541
1542 w = widths[n].cur;
1543 dist = width - w;
1544 if ( dist < 0 )
1545 dist = -dist;
1546 if ( dist < best )
1547 {
1548 best = dist;
1549 reference = w;
1550 }
1551 }
1552
1553 scaled = FT_PIX_ROUND( reference );
1554
1555 if ( width >= reference )
1556 {
1557 if ( width < scaled + 48 )
1558 width = reference;
1559 }
1560 else
1561 {
1562 if ( width > scaled - 48 )
1563 width = reference;
1564 }
1565
1566 return width;
1567 }
1568
1569
1570 /* compute the snapped width of a given stem */
1571
1572 static FT_Pos
1573 af_latin2_compute_stem_width( AF_GlyphHints hints,
1574 AF_Dimension dim,
1575 FT_Pos width,
1576 AF_Edge_Flags base_flags,
1577 AF_Edge_Flags stem_flags )
1578 {
1579 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics;
1580 AF_LatinAxis axis = & metrics->axis[dim];
1581 FT_Pos dist = width;
1582 FT_Int sign = 0;
1583 FT_Int vertical = ( dim == AF_DIMENSION_VERT );
1584
1585
1586 FT_UNUSED(base_flags);
1587
1588 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||
1589 axis->extra_light )
1590 return width;
1591
1592 if ( dist < 0 )
1593 {
1594 dist = -width;
1595 sign = 1;
1596 }
1597
1598 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
1599 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
1600 {
1601 /* smooth hinting process: very lightly quantize the stem width */
1602
1603 /* leave the widths of serifs alone */
1604
1605 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) )
1606 goto Done_Width;
1607
1608 #if 0
1609 else if ( ( base_flags & AF_EDGE_ROUND ) )
1610 {
1611 if ( dist < 80 )
1612 dist = 64;
1613 }
1614 else if ( dist < 56 )
1615 dist = 56;
1616 #endif
1617 if ( axis->width_count > 0 )
1618 {
1619 FT_Pos delta;
1620
1621
1622 /* compare to standard width */
1623 if ( axis->width_count > 0 )
1624 {
1625 delta = dist - axis->widths[0].cur;
1626
1627 if ( delta < 0 )
1628 delta = -delta;
1629
1630 if ( delta < 40 )
1631 {
1632 dist = axis->widths[0].cur;
1633 if ( dist < 48 )
1634 dist = 48;
1635
1636 goto Done_Width;
1637 }
1638 }
1639
1640 if ( dist < 3 * 64 )
1641 {
1642 delta = dist & 63;
1643 dist &= -64;
1644
1645 if ( delta < 10 )
1646 dist += delta;
1647
1648 else if ( delta < 32 )
1649 dist += 10;
1650
1651 else if ( delta < 54 )
1652 dist += 54;
1653
1654 else
1655 dist += delta;
1656 }
1657 else
1658 dist = ( dist + 32 ) & ~63;
1659 }
1660 }
1661 else
1662 {
1663 /* strong hinting process: snap the stem width to integer pixels */
1664 FT_Pos org_dist = dist;
1665
1666
1667 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist );
1668
1669 if ( vertical )
1670 {
1671 /* in the case of vertical hinting, always round */
1672 /* the stem heights to integer pixels */
1673
1674 if ( dist >= 64 )
1675 dist = ( dist + 16 ) & ~63;
1676 else
1677 dist = 64;
1678 }
1679 else
1680 {
1681 if ( AF_LATIN_HINTS_DO_MONO( hints ) )
1682 {
1683 /* monochrome horizontal hinting: snap widths to integer pixels */
1684 /* with a different threshold */
1685
1686 if ( dist < 64 )
1687 dist = 64;
1688 else
1689 dist = ( dist + 32 ) & ~63;
1690 }
1691 else
1692 {
1693 /* for horizontal anti-aliased hinting, we adopt a more subtle */
1694 /* approach: we strengthen small stems, round stems whose size */
1695 /* is between 1 and 2 pixels to an integer, otherwise nothing */
1696
1697 if ( dist < 48 )
1698 dist = ( dist + 64 ) >> 1;
1699
1700 else if ( dist < 128 )
1701 {
1702 /* We only round to an integer width if the corresponding */
1703 /* distortion is less than 1/4 pixel. Otherwise this */
1704 /* makes everything worse since the diagonals, which are */
1705 /* not hinted, appear a lot bolder or thinner than the */
1706 /* vertical stems. */
1707
1708 FT_Int delta;
1709
1710
1711 dist = ( dist + 22 ) & ~63;
1712 delta = dist - org_dist;
1713 if ( delta < 0 )
1714 delta = -delta;
1715
1716 if (delta >= 16)
1717 {
1718 dist = org_dist;
1719 if ( dist < 48 )
1720 dist = ( dist + 64 ) >> 1;
1721 }
1722 }
1723 else
1724 /* round otherwise to prevent color fringes in LCD mode */
1725 dist = ( dist + 32 ) & ~63;
1726 }
1727 }
1728 }
1729
1730 Done_Width:
1731 if ( sign )
1732 dist = -dist;
1733
1734 return dist;
1735 }
1736
1737
1738 /* align one stem edge relative to the previous stem edge */
1739
1740 static void
1741 af_latin2_align_linked_edge( AF_GlyphHints hints,
1742 AF_Dimension dim,
1743 AF_Edge base_edge,
1744 AF_Edge stem_edge )
1745 {
1746 FT_Pos dist = stem_edge->opos - base_edge->opos;
1747
1748 FT_Pos fitted_width = af_latin2_compute_stem_width(
1749 hints, dim, dist,
1750 (AF_Edge_Flags)base_edge->flags,
1751 (AF_Edge_Flags)stem_edge->flags );
1752
1753
1754 stem_edge->pos = base_edge->pos + fitted_width;
1755
1756 AF_LOG(( "LINK: edge %d (opos=%.2f) linked to (%.2f), "
1757 "dist was %.2f, now %.2f\n",
1758 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0,
1759 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 ));
1760 }
1761
1762
1763 static void
1764 af_latin2_align_serif_edge( AF_GlyphHints hints,
1765 AF_Edge base,
1766 AF_Edge serif )
1767 {
1768 FT_UNUSED( hints );
1769
1770 serif->pos = base->pos + (serif->opos - base->opos);
1771 }
1772
1773
1774 /*************************************************************************/
1775 /*************************************************************************/
1776 /*************************************************************************/
1777 /**** ****/
1778 /**** E D G E H I N T I N G ****/
1779 /**** ****/
1780 /*************************************************************************/
1781 /*************************************************************************/
1782 /*************************************************************************/
1783
1784
1785 FT_LOCAL_DEF( void )
1786 af_latin2_hint_edges( AF_GlyphHints hints,
1787 AF_Dimension dim )
1788 {
1789 AF_AxisHints axis = &hints->axis[dim];
1790 AF_Edge edges = axis->edges;
1791 AF_Edge edge_limit = edges + axis->num_edges;
1792 AF_Edge edge;
1793 AF_Edge anchor = 0;
1794 FT_Int has_serifs = 0;
1795 FT_Pos anchor_drift = 0;
1796
1797
1798
1799 AF_LOG(( "==== hinting %s edges =====\n", dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ));
1800
1801 /* we begin by aligning all stems relative to the blue zone */
1802 /* if needed -- that's only for horizontal edges */
1803
1804 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) )
1805 {
1806 for ( edge = edges; edge < edge_limit; edge++ )
1807 {
1808 AF_Width blue;
1809 AF_Edge edge1, edge2;
1810
1811
1812 if ( edge->flags & AF_EDGE_DONE )
1813 continue;
1814
1815 blue = edge->blue_edge;
1816 edge1 = NULL;
1817 edge2 = edge->link;
1818
1819 if ( blue )
1820 {
1821 edge1 = edge;
1822 }
1823 else if ( edge2 && edge2->blue_edge )
1824 {
1825 blue = edge2->blue_edge;
1826 edge1 = edge2;
1827 edge2 = edge;
1828 }
1829
1830 if ( !edge1 )
1831 continue;
1832
1833 AF_LOG(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), "
1834 "was (%.2f)\n",
1835 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0,
1836 edge1->pos / 64.0 ));
1837
1838 edge1->pos = blue->fit;
1839 edge1->flags |= AF_EDGE_DONE;
1840
1841 if ( edge2 && !edge2->blue_edge )
1842 {
1843 af_latin2_align_linked_edge( hints, dim, edge1, edge2 );
1844 edge2->flags |= AF_EDGE_DONE;
1845 }
1846
1847 if ( !anchor )
1848 {
1849 anchor = edge;
1850
1851 anchor_drift = (anchor->pos - anchor->opos);
1852 if (edge2)
1853 anchor_drift = (anchor_drift + (edge2->pos - edge2->opos)) >> 1;
1854 }
1855 }
1856 }
1857
1858 /* now we will align all stem edges, trying to maintain the */
1859 /* relative order of stems in the glyph */
1860 for ( edge = edges; edge < edge_limit; edge++ )
1861 {
1862 AF_Edge edge2;
1863
1864
1865 if ( edge->flags & AF_EDGE_DONE )
1866 continue;
1867
1868 /* skip all non-stem edges */
1869 edge2 = edge->link;
1870 if ( !edge2 )
1871 {
1872 has_serifs++;
1873 continue;
1874 }
1875
1876 /* now align the stem */
1877
1878 /* this should not happen, but it's better to be safe */
1879 if ( edge2->blue_edge )
1880 {
1881 AF_LOG(( "ASSERTION FAILED for edge %d\n", edge2-edges ));
1882
1883 af_latin2_align_linked_edge( hints, dim, edge2, edge );
1884 edge->flags |= AF_EDGE_DONE;
1885 continue;
1886 }
1887
1888 if ( !anchor )
1889 {
1890 FT_Pos org_len, org_center, cur_len;
1891 FT_Pos cur_pos1, error1, error2, u_off, d_off;
1892
1893
1894 org_len = edge2->opos - edge->opos;
1895 cur_len = af_latin2_compute_stem_width(
1896 hints, dim, org_len,
1897 (AF_Edge_Flags)edge->flags,
1898 (AF_Edge_Flags)edge2->flags );
1899 if ( cur_len <= 64 )
1900 u_off = d_off = 32;
1901 else
1902 {
1903 u_off = 38;
1904 d_off = 26;
1905 }
1906
1907 if ( cur_len < 96 )
1908 {
1909 org_center = edge->opos + ( org_len >> 1 );
1910
1911 cur_pos1 = FT_PIX_ROUND( org_center );
1912
1913 error1 = org_center - ( cur_pos1 - u_off );
1914 if ( error1 < 0 )
1915 error1 = -error1;
1916
1917 error2 = org_center - ( cur_pos1 + d_off );
1918 if ( error2 < 0 )
1919 error2 = -error2;
1920
1921 if ( error1 < error2 )
1922 cur_pos1 -= u_off;
1923 else
1924 cur_pos1 += d_off;
1925
1926 edge->pos = cur_pos1 - cur_len / 2;
1927 edge2->pos = edge->pos + cur_len;
1928 }
1929 else
1930 edge->pos = FT_PIX_ROUND( edge->opos );
1931
1932 AF_LOG(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f) "
1933 "snapped to (%.2f) (%.2f)\n",
1934 edge-edges, edge->opos / 64.0,
1935 edge2-edges, edge2->opos / 64.0,
1936 edge->pos / 64.0, edge2->pos / 64.0 ));
1937 anchor = edge;
1938
1939 edge->flags |= AF_EDGE_DONE;
1940
1941 af_latin2_align_linked_edge( hints, dim, edge, edge2 );
1942
1943 edge2->flags |= AF_EDGE_DONE;
1944
1945 anchor_drift = ( (anchor->pos - anchor->opos) +
1946 (edge2->pos - edge2->opos)) >> 1;
1947
1948 AF_LOG(( "DRIFT: %.2f\n", anchor_drift/64.0 ));
1949 }
1950 else
1951 {
1952 FT_Pos org_pos, org_len, org_center, cur_center, cur_len;
1953 FT_Pos org_left, org_right;
1954
1955
1956 org_pos = edge->opos + anchor_drift;
1957 org_len = edge2->opos - edge->opos;
1958 org_center = org_pos + ( org_len >> 1 );
1959
1960 cur_len = af_latin2_compute_stem_width(
1961 hints, dim, org_len,
1962 (AF_Edge_Flags)edge->flags,
1963 (AF_Edge_Flags)edge2->flags );
1964
1965 org_left = org_pos + ((org_len - cur_len) >> 1);
1966 org_right = org_pos + ((org_len + cur_len) >> 1);
1967
1968 AF_LOG(( "ALIGN: left=%.2f right=%.2f ", org_left/64.0, org_right/64.0 ));
1969 cur_center = org_center;
1970
1971 if ( edge2->flags & AF_EDGE_DONE )
1972 {
1973 AF_LOG(( "\n" ));
1974 edge->pos = edge2->pos - cur_len;
1975 }
1976 else
1977 {
1978 /* we want to compare several displacement, and choose
1979 * the one that increases fitness while minimizing
1980 * distortion as well
1981 */
1982 FT_Pos displacements[6], scores[6], org, fit, delta;
1983 FT_UInt count = 0;
1984
1985 /* note: don't even try to fit tiny stems */
1986 if ( cur_len < 32 )
1987 {
1988 AF_LOG(( "tiny stem\n" ));
1989 goto AlignStem;
1990 }
1991
1992 /* if the span is within a single pixel, don't touch it */
1993 if ( FT_PIX_FLOOR(org_left) == FT_PIX_CEIL(org_right) )
1994 {
1995 AF_LOG(( "single pixel stem\n" ));
1996 goto AlignStem;
1997 }
1998
1999 if (cur_len <= 96)
2000 {
2001 /* we want to avoid the absolute worst case which is
2002 * when the left and right edges of the span each represent
2003 * about 50% of the gray. we'd better want to change this
2004 * to 25/75%, since this is much more pleasant to the eye with
2005 * very acceptable distortion
2006 */
2007 FT_Pos frac_left = (org_left) & 63;
2008 FT_Pos frac_right = (org_right) & 63;
2009
2010 if ( frac_left >= 22 && frac_left <= 42 &&
2011 frac_right >= 22 && frac_right <= 42 )
2012 {
2013 org = frac_left;
2014 fit = (org <= 32) ? 16 : 48;
2015 delta = FT_ABS(fit - org);
2016 displacements[count] = fit - org;
2017 scores[count++] = delta;
2018 AF_LOG(( "dispA=%.2f (%d) ", (fit - org)/64.0, delta ));
2019
2020 org = frac_right;
2021 fit = (org <= 32) ? 16 : 48;
2022 delta = FT_ABS(fit - org);
2023 displacements[count] = fit - org;
2024 scores[count++] = delta;
2025 AF_LOG(( "dispB=%.2f (%d) ", (fit - org)/64.0, delta ));
2026 }
2027 }
2028
2029 /* snapping the left edge to the grid */
2030 org = org_left;
2031 fit = FT_PIX_ROUND(org);
2032 delta = FT_ABS(fit - org);
2033 displacements[count] = fit - org;
2034 scores[count++] = delta;
2035 AF_LOG(( "dispC=%.2f (%d) ", (fit - org)/64.0, delta ));
2036
2037 /* snapping the right edge to the grid */
2038 org = org_right;
2039 fit = FT_PIX_ROUND(org);
2040 delta = FT_ABS(fit - org);
2041 displacements[count] = fit - org;
2042 scores[count++] = delta;
2043 AF_LOG(( "dispD=%.2f (%d) ", (fit - org)/64.0, delta ));
2044
2045 /* now find the best displacement */
2046 {
2047 FT_Pos best_score = scores[0];
2048 FT_Pos best_disp = displacements[0];
2049 FT_UInt nn;
2050
2051 for (nn = 1; nn < count; nn++)
2052 {
2053 if (scores[nn] < best_score)
2054 {
2055 best_score = scores[nn];
2056 best_disp = displacements[nn];
2057 }
2058 }
2059
2060 cur_center = org_center + best_disp;
2061 }
2062 AF_LOG(( "\n" ));
2063 }
2064
2065 AlignStem:
2066 edge->pos = cur_center - (cur_len >> 1);
2067 edge2->pos = edge->pos + cur_len;
2068
2069 AF_LOG(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f) "
2070 "snapped to (%.2f) and (%.2f), org_len = %.2f cur_len=%.2f\n",
2071 edge-edges, edge->opos / 64.0,
2072 edge2-edges, edge2->opos / 64.0,
2073 edge->pos / 64.0, edge2->pos / 64.0,
2074 org_len / 64.0, cur_len / 64.0 ));
2075
2076 edge->flags |= AF_EDGE_DONE;
2077 edge2->flags |= AF_EDGE_DONE;
2078
2079 if ( edge > edges && edge->pos < edge[-1].pos )
2080 {
2081 AF_LOG(( "BOUND: %d (pos=%.2f) to (%.2f)\n",
2082 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 ));
2083 edge->pos = edge[-1].pos;
2084 }
2085 }
2086 }
2087
2088 /* make sure that lowercase m's maintain their symmetry */
2089
2090 /* In general, lowercase m's have six vertical edges if they are sans */
2091 /* serif, or twelve if they are with serifs. This implementation is */
2092 /* based on that assumption, and seems to work very well with most */
2093 /* faces. However, if for a certain face this assumption is not */
2094 /* true, the m is just rendered like before. In addition, any stem */
2095 /* correction will only be applied to symmetrical glyphs (even if the */
2096 /* glyph is not an m), so the potential for unwanted distortion is */
2097 /* relatively low. */
2098
2099 /* We don't handle horizontal edges since we can't easily assure that */
2100 /* the third (lowest) stem aligns with the base line; it might end up */
2101 /* one pixel higher or lower. */
2102
2103 #if 0
2104 {
2105 FT_Int n_edges = edge_limit - edges;
2106
2107
2108 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
2109 {
2110 AF_Edge edge1, edge2, edge3;
2111 FT_Pos dist1, dist2, span, delta;
2112
2113
2114 if ( n_edges == 6 )
2115 {
2116 edge1 = edges;
2117 edge2 = edges + 2;
2118 edge3 = edges + 4;
2119 }
2120 else
2121 {
2122 edge1 = edges + 1;
2123 edge2 = edges + 5;
2124 edge3 = edges + 9;
2125 }
2126
2127 dist1 = edge2->opos - edge1->opos;
2128 dist2 = edge3->opos - edge2->opos;
2129
2130 span = dist1 - dist2;
2131 if ( span < 0 )
2132 span = -span;
2133
2134 if ( span < 8 )
2135 {
2136 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
2137 edge3->pos -= delta;
2138 if ( edge3->link )
2139 edge3->link->pos -= delta;
2140
2141 /* move the serifs along with the stem */
2142 if ( n_edges == 12 )
2143 {
2144 ( edges + 8 )->pos -= delta;
2145 ( edges + 11 )->pos -= delta;
2146 }
2147
2148 edge3->flags |= AF_EDGE_DONE;
2149 if ( edge3->link )
2150 edge3->link->flags |= AF_EDGE_DONE;
2151 }
2152 }
2153 }
2154 #endif
2155
2156 if ( has_serifs || !anchor )
2157 {
2158 /*
2159 * now hint the remaining edges (serifs and single) in order
2160 * to complete our processing
2161 */
2162 for ( edge = edges; edge < edge_limit; edge++ )
2163 {
2164 FT_Pos delta;
2165
2166
2167 if ( edge->flags & AF_EDGE_DONE )
2168 continue;
2169
2170 delta = 1000;
2171
2172 if ( edge->serif )
2173 {
2174 delta = edge->serif->opos - edge->opos;
2175 if ( delta < 0 )
2176 delta = -delta;
2177 }
2178
2179 if ( delta < 64 + 16 )
2180 {
2181 af_latin2_align_serif_edge( hints, edge->serif, edge );
2182 AF_LOG(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f) "
2183 "aligned to (%.2f)\n",
2184 edge-edges, edge->opos / 64.0,
2185 edge->serif - edges, edge->serif->opos / 64.0,
2186 edge->pos / 64.0 ));
2187 }
2188 else if ( !anchor )
2189 {
2190 AF_LOG(( "SERIF_ANCHOR: edge %d (opos=%.2f) snapped to (%.2f)\n",
2191 edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
2192 edge->pos = FT_PIX_ROUND( edge->opos );
2193 anchor = edge;
2194 }
2195 else
2196 {
2197 AF_Edge before, after;
2198
2199
2200 for ( before = edge - 1; before >= edges; before-- )
2201 if ( before->flags & AF_EDGE_DONE )
2202 break;
2203
2204 for ( after = edge + 1; after < edge_limit; after++ )
2205 if ( after->flags & AF_EDGE_DONE )
2206 break;
2207
2208 if ( before >= edges && before < edge &&
2209 after < edge_limit && after > edge )
2210 {
2211 if ( after->opos == before->opos )
2212 edge->pos = before->pos;
2213 else
2214 edge->pos = before->pos +
2215 FT_MulDiv( edge->opos - before->opos,
2216 after->pos - before->pos,
2217 after->opos - before->opos );
2218 AF_LOG(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f) from %d (opos=%.2f)\n",
2219 edge-edges, edge->opos / 64.0, edge->pos / 64.0, before - edges, before->opos / 64.0 ));
2220 }
2221 else
2222 {
2223 edge->pos = anchor->pos + (( edge->opos - anchor->opos + 16) & ~31);
2224
2225 AF_LOG(( "SERIF_LINK2: edge %d (opos=%.2f) snapped to (%.2f)\n",
2226 edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
2227 }
2228 }
2229
2230 edge->flags |= AF_EDGE_DONE;
2231
2232 if ( edge > edges && edge->pos < edge[-1].pos )
2233 edge->pos = edge[-1].pos;
2234
2235 if ( edge + 1 < edge_limit &&
2236 edge[1].flags & AF_EDGE_DONE &&
2237 edge->pos > edge[1].pos )
2238 edge->pos = edge[1].pos;
2239 }
2240 }
2241 }
2242
2243
2244 static FT_Error
2245 af_latin2_hints_apply( AF_GlyphHints hints,
2246 FT_Outline* outline,
2247 AF_LatinMetrics metrics )
2248 {
2249 FT_Error error;
2250 int dim;
2251
2252
2253 error = af_glyph_hints_reload( hints, outline );
2254 if ( error )
2255 goto Exit;
2256
2257 /* analyze glyph outline */
2258 #ifdef AF_USE_WARPER
2259 if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ||
2260 AF_HINTS_DO_HORIZONTAL( hints ) )
2261 #else
2262 if ( AF_HINTS_DO_HORIZONTAL( hints ) )
2263 #endif
2264 {
2265 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ );
2266 if ( error )
2267 goto Exit;
2268 }
2269
2270 if ( AF_HINTS_DO_VERTICAL( hints ) )
2271 {
2272 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT );
2273 if ( error )
2274 goto Exit;
2275
2276 af_latin2_hints_compute_blue_edges( hints, metrics );
2277 }
2278
2279 /* grid-fit the outline */
2280 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
2281 {
2282 #ifdef AF_USE_WARPER
2283 if ( ( dim == AF_DIMENSION_HORZ &&
2284 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) )
2285 {
2286 AF_WarperRec warper;
2287 FT_Fixed scale;
2288 FT_Pos delta;
2289
2290
2291 af_warper_compute( &warper, hints, dim, &scale, &delta );
2292 af_glyph_hints_scale_dim( hints, dim, scale, delta );
2293 continue;
2294 }
2295 #endif
2296
2297 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
2298 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
2299 {
2300 af_latin2_hint_edges( hints, (AF_Dimension)dim );
2301 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim );
2302 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
2303 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
2304 }
2305 }
2306 af_glyph_hints_save( hints, outline );
2307
2308 Exit:
2309 return error;
2310 }
2311
2312
2313 /*************************************************************************/
2314 /*************************************************************************/
2315 /***** *****/
2316 /***** L A T I N S C R I P T C L A S S *****/
2317 /***** *****/
2318 /*************************************************************************/
2319 /*************************************************************************/
2320
2321
2322 static const AF_Script_UniRangeRec af_latin2_uniranges[] =
2323 {
2324 AF_UNIRANGE_REC( 32UL, 127UL ), /* XXX: TODO: Add new Unicode ranges here! */
2325 AF_UNIRANGE_REC( 160UL, 255UL ),
2326 AF_UNIRANGE_REC( 0UL, 0UL )
2327 };
2328
2329
2330 AF_DEFINE_SCRIPT_CLASS(af_latin2_script_class,
2331 AF_SCRIPT_LATIN2,
2332 af_latin2_uniranges,
2333
2334 sizeof( AF_LatinMetricsRec ),
2335
2336 (AF_Script_InitMetricsFunc) af_latin2_metrics_init,
2337 (AF_Script_ScaleMetricsFunc)af_latin2_metrics_scale,
2338 (AF_Script_DoneMetricsFunc) NULL,
2339
2340 (AF_Script_InitHintsFunc) af_latin2_hints_init,
2341 (AF_Script_ApplyHintsFunc) af_latin2_hints_apply
2342 )
2343
2344
2345 /* END */
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