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Create a branch for cmake bringup.
[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 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, 0 );
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 scale = FT_MulDiv( scale, fitted, scaled );
550 AF_LOG(( "== scaled x-top = %.2g fitted = %.2g, scaling = %.4g\n", scaled/64.0, fitted/64.0, (fitted*1.0)/scaled ));
551 }
552 #endif
553 }
554 }
555
556 axis->scale = scale;
557 axis->delta = delta;
558
559 if ( dim == AF_DIMENSION_HORZ )
560 {
561 metrics->root.scaler.x_scale = scale;
562 metrics->root.scaler.x_delta = delta;
563 }
564 else
565 {
566 metrics->root.scaler.y_scale = scale;
567 metrics->root.scaler.y_delta = delta;
568 }
569
570 /* scale the standard widths */
571 for ( nn = 0; nn < axis->width_count; nn++ )
572 {
573 AF_Width width = axis->widths + nn;
574
575
576 width->cur = FT_MulFix( width->org, scale );
577 width->fit = width->cur;
578 }
579
580 /* an extra-light axis corresponds to a standard width that is */
581 /* smaller than 0.75 pixels */
582 axis->extra_light =
583 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );
584
585 if ( dim == AF_DIMENSION_VERT )
586 {
587 /* scale the blue zones */
588 for ( nn = 0; nn < axis->blue_count; nn++ )
589 {
590 AF_LatinBlue blue = &axis->blues[nn];
591 FT_Pos dist;
592
593
594 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
595 blue->ref.fit = blue->ref.cur;
596 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
597 blue->shoot.fit = blue->shoot.cur;
598 blue->flags &= ~AF_LATIN_BLUE_ACTIVE;
599
600 /* a blue zone is only active if it is less than 3/4 pixels tall */
601 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
602 if ( dist <= 48 && dist >= -48 )
603 {
604 FT_Pos delta1, delta2;
605
606 delta1 = blue->shoot.org - blue->ref.org;
607 delta2 = delta1;
608 if ( delta1 < 0 )
609 delta2 = -delta2;
610
611 delta2 = FT_MulFix( delta2, scale );
612
613 if ( delta2 < 32 )
614 delta2 = 0;
615 else if ( delta2 < 64 )
616 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
617 else
618 delta2 = FT_PIX_ROUND( delta2 );
619
620 if ( delta1 < 0 )
621 delta2 = -delta2;
622
623 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
624 blue->shoot.fit = blue->ref.fit + delta2;
625
626 AF_LOG(( ">> activating blue zone %d: ref.cur=%.2g ref.fit=%.2g shoot.cur=%.2g shoot.fit=%.2g\n",
627 nn, blue->ref.cur/64.0, blue->ref.fit/64.0,
628 blue->shoot.cur/64.0, blue->shoot.fit/64.0 ));
629
630 blue->flags |= AF_LATIN_BLUE_ACTIVE;
631 }
632 }
633 }
634 }
635
636
637 FT_LOCAL_DEF( void )
638 af_latin2_metrics_scale( AF_LatinMetrics metrics,
639 AF_Scaler scaler )
640 {
641 metrics->root.scaler.render_mode = scaler->render_mode;
642 metrics->root.scaler.face = scaler->face;
643
644 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
645 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
646 }
647
648
649 /*************************************************************************/
650 /*************************************************************************/
651 /***** *****/
652 /***** L A T I N G L Y P H A N A L Y S I S *****/
653 /***** *****/
654 /*************************************************************************/
655 /*************************************************************************/
656
657 #define SORT_SEGMENTS
658
659 FT_LOCAL_DEF( FT_Error )
660 af_latin2_hints_compute_segments( AF_GlyphHints hints,
661 AF_Dimension dim )
662 {
663 AF_AxisHints axis = &hints->axis[dim];
664 FT_Memory memory = hints->memory;
665 FT_Error error = AF_Err_Ok;
666 AF_Segment segment = NULL;
667 AF_SegmentRec seg0;
668 AF_Point* contour = hints->contours;
669 AF_Point* contour_limit = contour + hints->num_contours;
670 AF_Direction major_dir, segment_dir;
671
672
673 FT_ZERO( &seg0 );
674 seg0.score = 32000;
675 seg0.flags = AF_EDGE_NORMAL;
676
677 major_dir = (AF_Direction)FT_ABS( axis->major_dir );
678 segment_dir = major_dir;
679
680 axis->num_segments = 0;
681
682 /* set up (u,v) in each point */
683 if ( dim == AF_DIMENSION_HORZ )
684 {
685 AF_Point point = hints->points;
686 AF_Point limit = point + hints->num_points;
687
688
689 for ( ; point < limit; point++ )
690 {
691 point->u = point->fx;
692 point->v = point->fy;
693 }
694 }
695 else
696 {
697 AF_Point point = hints->points;
698 AF_Point limit = point + hints->num_points;
699
700
701 for ( ; point < limit; point++ )
702 {
703 point->u = point->fy;
704 point->v = point->fx;
705 }
706 }
707
708 /* do each contour separately */
709 for ( ; contour < contour_limit; contour++ )
710 {
711 AF_Point point = contour[0];
712 AF_Point start = point;
713 AF_Point last = point->prev;
714
715
716 if ( point == last ) /* skip singletons -- just in case */
717 continue;
718
719 /* already on an edge ?, backtrack to find its start */
720 if ( FT_ABS( point->in_dir ) == major_dir )
721 {
722 point = point->prev;
723
724 while ( point->in_dir == start->in_dir )
725 point = point->prev;
726 }
727 else /* otherwise, find first segment start, if any */
728 {
729 while ( FT_ABS( point->out_dir ) != major_dir )
730 {
731 point = point->next;
732
733 if ( point == start )
734 goto NextContour;
735 }
736 }
737
738 start = point;
739
740 for (;;)
741 {
742 AF_Point first;
743 FT_Pos min_u, min_v, max_u, max_v;
744
745 /* we're at the start of a new segment */
746 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir &&
747 point->in_dir != point->out_dir );
748 first = point;
749
750 min_u = max_u = point->u;
751 min_v = max_v = point->v;
752
753 point = point->next;
754
755 while ( point->out_dir == first->out_dir )
756 {
757 point = point->next;
758
759 if ( point->u < min_u )
760 min_u = point->u;
761
762 if ( point->u > max_u )
763 max_u = point->u;
764 }
765
766 if ( point->v < min_v )
767 min_v = point->v;
768
769 if ( point->v > max_v )
770 max_v = point->v;
771
772 /* record new segment */
773 error = af_axis_hints_new_segment( axis, memory, &segment );
774 if ( error )
775 goto Exit;
776
777 segment[0] = seg0;
778 segment->dir = first->out_dir;
779 segment->first = first;
780 segment->last = point;
781 segment->contour = contour;
782 segment->pos = (FT_Short)(( min_u + max_u ) >> 1);
783 segment->min_coord = (FT_Short) min_v;
784 segment->max_coord = (FT_Short) max_v;
785 segment->height = (FT_Short)(max_v - min_v);
786
787 /* a segment is round if it doesn't have successive */
788 /* on-curve points. */
789 {
790 AF_Point pt = first;
791 AF_Point last = point;
792 AF_Flags f0 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
793 AF_Flags f1;
794
795
796 segment->flags &= ~AF_EDGE_ROUND;
797
798 for ( ; pt != last; f0 = f1 )
799 {
800 pt = pt->next;
801 f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
802
803 if ( !f0 && !f1 )
804 break;
805
806 if ( pt == last )
807 segment->flags |= AF_EDGE_ROUND;
808 }
809 }
810
811 /* this can happen in the case of a degenerate contour
812 * e.g. a 2-point vertical contour
813 */
814 if ( point == start )
815 break;
816
817 /* jump to the start of the next segment, if any */
818 while ( FT_ABS(point->out_dir) != major_dir )
819 {
820 point = point->next;
821
822 if ( point == start )
823 goto NextContour;
824 }
825 }
826
827 NextContour:
828 ;
829 } /* contours */
830
831 /* now slightly increase the height of segments when this makes */
832 /* sense -- this is used to better detect and ignore serifs */
833 {
834 AF_Segment segments = axis->segments;
835 AF_Segment segments_end = segments + axis->num_segments;
836
837
838 for ( segment = segments; segment < segments_end; segment++ )
839 {
840 AF_Point first = segment->first;
841 AF_Point last = segment->last;
842 AF_Point p;
843 FT_Pos first_v = first->v;
844 FT_Pos last_v = last->v;
845
846
847 if ( first == last )
848 continue;
849
850 if ( first_v < last_v )
851 {
852 p = first->prev;
853 if ( p->v < first_v )
854 segment->height = (FT_Short)( segment->height +
855 ( ( first_v - p->v ) >> 1 ) );
856
857 p = last->next;
858 if ( p->v > last_v )
859 segment->height = (FT_Short)( segment->height +
860 ( ( p->v - last_v ) >> 1 ) );
861 }
862 else
863 {
864 p = first->prev;
865 if ( p->v > first_v )
866 segment->height = (FT_Short)( segment->height +
867 ( ( p->v - first_v ) >> 1 ) );
868
869 p = last->next;
870 if ( p->v < last_v )
871 segment->height = (FT_Short)( segment->height +
872 ( ( last_v - p->v ) >> 1 ) );
873 }
874 }
875 }
876
877 #ifdef AF_SORT_SEGMENTS
878 /* place all segments with a negative direction to the start
879 * of the array, used to speed up segment linking later...
880 */
881 {
882 AF_Segment segments = axis->segments;
883 FT_UInt count = axis->num_segments;
884 FT_UInt ii, jj;
885
886 for (ii = 0; ii < count; ii++)
887 {
888 if ( segments[ii].dir > 0 )
889 {
890 for (jj = ii+1; jj < count; jj++)
891 {
892 if ( segments[jj].dir < 0 )
893 {
894 AF_SegmentRec tmp;
895
896 tmp = segments[ii];
897 segments[ii] = segments[jj];
898 segments[jj] = tmp;
899
900 break;
901 }
902 }
903
904 if ( jj == count )
905 break;
906 }
907 }
908 axis->mid_segments = ii;
909 }
910 #endif
911
912 Exit:
913 return error;
914 }
915
916
917 FT_LOCAL_DEF( void )
918 af_latin2_hints_link_segments( AF_GlyphHints hints,
919 AF_Dimension dim )
920 {
921 AF_AxisHints axis = &hints->axis[dim];
922 AF_Segment segments = axis->segments;
923 AF_Segment segment_limit = segments + axis->num_segments;
924 #ifdef AF_SORT_SEGMENTS
925 AF_Segment segment_mid = segments + axis->mid_segments;
926 #endif
927 FT_Pos len_threshold, len_score;
928 AF_Segment seg1, seg2;
929
930
931 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
932 if ( len_threshold == 0 )
933 len_threshold = 1;
934
935 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 );
936
937 #ifdef AF_SORT_SEGMENTS
938 for ( seg1 = segments; seg1 < segment_mid; seg1++ )
939 {
940 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
941 continue;
942
943 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ )
944 #else
945 /* now compare each segment to the others */
946 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
947 {
948 /* the fake segments are introduced to hint the metrics -- */
949 /* we must never link them to anything */
950 if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
951 continue;
952
953 for ( seg2 = segments; seg2 < segment_limit; seg2++ )
954 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )
955 #endif
956 {
957 FT_Pos pos1 = seg1->pos;
958 FT_Pos pos2 = seg2->pos;
959 FT_Pos dist = pos2 - pos1;
960
961
962 if ( dist < 0 )
963 continue;
964
965 {
966 FT_Pos min = seg1->min_coord;
967 FT_Pos max = seg1->max_coord;
968 FT_Pos len, score;
969
970
971 if ( min < seg2->min_coord )
972 min = seg2->min_coord;
973
974 if ( max > seg2->max_coord )
975 max = seg2->max_coord;
976
977 len = max - min;
978 if ( len >= len_threshold )
979 {
980 score = dist + len_score / len;
981 if ( score < seg1->score )
982 {
983 seg1->score = score;
984 seg1->link = seg2;
985 }
986
987 if ( score < seg2->score )
988 {
989 seg2->score = score;
990 seg2->link = seg1;
991 }
992 }
993 }
994 }
995 }
996 #if 0
997 }
998 #endif
999
1000 /* now, compute the `serif' segments */
1001 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
1002 {
1003 seg2 = seg1->link;
1004
1005 if ( seg2 )
1006 {
1007 if ( seg2->link != seg1 )
1008 {
1009 seg1->link = 0;
1010 seg1->serif = seg2->link;
1011 }
1012 }
1013 }
1014 }
1015
1016
1017 FT_LOCAL_DEF( FT_Error )
1018 af_latin2_hints_compute_edges( AF_GlyphHints hints,
1019 AF_Dimension dim )
1020 {
1021 AF_AxisHints axis = &hints->axis[dim];
1022 FT_Error error = AF_Err_Ok;
1023 FT_Memory memory = hints->memory;
1024 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim];
1025
1026 AF_Segment segments = axis->segments;
1027 AF_Segment segment_limit = segments + axis->num_segments;
1028 AF_Segment seg;
1029
1030 AF_Direction up_dir;
1031 FT_Fixed scale;
1032 FT_Pos edge_distance_threshold;
1033 FT_Pos segment_length_threshold;
1034
1035
1036 axis->num_edges = 0;
1037
1038 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
1039 : hints->y_scale;
1040
1041 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP
1042 : AF_DIR_RIGHT;
1043
1044 /*
1045 * We want to ignore very small (mostly serif) segments, we do that
1046 * by ignoring those that whose length is less than a given fraction
1047 * of the standard width. If there is no standard width, we ignore
1048 * those that are less than a given size in pixels
1049 *
1050 * also, unlink serif segments that are linked to segments farther
1051 * than 50% of the standard width
1052 */
1053 if ( dim == AF_DIMENSION_HORZ )
1054 {
1055 if ( laxis->width_count > 0 )
1056 segment_length_threshold = (laxis->standard_width * 10 ) >> 4;
1057 else
1058 segment_length_threshold = FT_DivFix( 64, hints->y_scale );
1059 }
1060 else
1061 segment_length_threshold = 0;
1062
1063 /*********************************************************************/
1064 /* */
1065 /* We will begin by generating a sorted table of edges for the */
1066 /* current direction. To do so, we simply scan each segment and try */
1067 /* to find an edge in our table that corresponds to its position. */
1068 /* */
1069 /* If no edge is found, we create and insert a new edge in the */
1070 /* sorted table. Otherwise, we simply add the segment to the edge's */
1071 /* list which will be processed in the second step to compute the */
1072 /* edge's properties. */
1073 /* */
1074 /* Note that the edges table is sorted along the segment/edge */
1075 /* position. */
1076 /* */
1077 /*********************************************************************/
1078
1079 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
1080 scale );
1081 if ( edge_distance_threshold > 64 / 4 )
1082 edge_distance_threshold = 64 / 4;
1083
1084 edge_distance_threshold = FT_DivFix( edge_distance_threshold,
1085 scale );
1086
1087 for ( seg = segments; seg < segment_limit; seg++ )
1088 {
1089 AF_Edge found = 0;
1090 FT_Int ee;
1091
1092
1093 if ( seg->height < segment_length_threshold )
1094 continue;
1095
1096 /* A special case for serif edges: If they are smaller than */
1097 /* 1.5 pixels we ignore them. */
1098 if ( seg->serif )
1099 {
1100 FT_Pos dist = seg->serif->pos - seg->pos;
1101
1102 if (dist < 0)
1103 dist = -dist;
1104
1105 if (dist >= laxis->standard_width >> 1)
1106 {
1107 /* unlink this serif, it is too distant from its reference stem */
1108 seg->serif = NULL;
1109 }
1110 else if ( 2*seg->height < 3 * segment_length_threshold )
1111 continue;
1112 }
1113
1114 /* look for an edge corresponding to the segment */
1115 for ( ee = 0; ee < axis->num_edges; ee++ )
1116 {
1117 AF_Edge edge = axis->edges + ee;
1118 FT_Pos dist;
1119
1120
1121 dist = seg->pos - edge->fpos;
1122 if ( dist < 0 )
1123 dist = -dist;
1124
1125 if ( dist < edge_distance_threshold && edge->dir == seg->dir )
1126 {
1127 found = edge;
1128 break;
1129 }
1130 }
1131
1132 if ( !found )
1133 {
1134 AF_Edge edge;
1135
1136
1137 /* insert a new edge in the list and */
1138 /* sort according to the position */
1139 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, memory, &edge );
1140 if ( error )
1141 goto Exit;
1142
1143 /* add the segment to the new edge's list */
1144 FT_ZERO( edge );
1145
1146 edge->first = seg;
1147 edge->last = seg;
1148 edge->fpos = seg->pos;
1149 edge->dir = seg->dir;
1150 edge->opos = edge->pos = FT_MulFix( seg->pos, scale );
1151 seg->edge_next = seg;
1152 }
1153 else
1154 {
1155 /* if an edge was found, simply add the segment to the edge's */
1156 /* list */
1157 seg->edge_next = found->first;
1158 found->last->edge_next = seg;
1159 found->last = seg;
1160 }
1161 }
1162
1163
1164 /*********************************************************************/
1165 /* */
1166 /* Good, we will now compute each edge's properties according to */
1167 /* segments found on its position. Basically, these are: */
1168 /* */
1169 /* - edge's main direction */
1170 /* - stem edge, serif edge or both (which defaults to stem then) */
1171 /* - rounded edge, straight or both (which defaults to straight) */
1172 /* - link for edge */
1173 /* */
1174 /*********************************************************************/
1175
1176 /* first of all, set the `edge' field in each segment -- this is */
1177 /* required in order to compute edge links */
1178
1179 /*
1180 * Note that removing this loop and setting the `edge' field of each
1181 * segment directly in the code above slows down execution speed for
1182 * some reasons on platforms like the Sun.
1183 */
1184 {
1185 AF_Edge edges = axis->edges;
1186 AF_Edge edge_limit = edges + axis->num_edges;
1187 AF_Edge edge;
1188
1189
1190 for ( edge = edges; edge < edge_limit; edge++ )
1191 {
1192 seg = edge->first;
1193 if ( seg )
1194 do
1195 {
1196 seg->edge = edge;
1197 seg = seg->edge_next;
1198
1199 } while ( seg != edge->first );
1200 }
1201
1202 /* now, compute each edge properties */
1203 for ( edge = edges; edge < edge_limit; edge++ )
1204 {
1205 FT_Int is_round = 0; /* does it contain round segments? */
1206 FT_Int is_straight = 0; /* does it contain straight segments? */
1207 FT_Pos ups = 0; /* number of upwards segments */
1208 FT_Pos downs = 0; /* number of downwards segments */
1209
1210
1211 seg = edge->first;
1212
1213 do
1214 {
1215 FT_Bool is_serif;
1216
1217
1218 /* check for roundness of segment */
1219 if ( seg->flags & AF_EDGE_ROUND )
1220 is_round++;
1221 else
1222 is_straight++;
1223
1224 /* check for segment direction */
1225 if ( seg->dir == up_dir )
1226 ups += seg->max_coord-seg->min_coord;
1227 else
1228 downs += seg->max_coord-seg->min_coord;
1229
1230 /* check for links -- if seg->serif is set, then seg->link must */
1231 /* be ignored */
1232 is_serif = (FT_Bool)( seg->serif &&
1233 seg->serif->edge &&
1234 seg->serif->edge != edge );
1235
1236 if ( ( seg->link && seg->link->edge != NULL ) || is_serif )
1237 {
1238 AF_Edge edge2;
1239 AF_Segment seg2;
1240
1241
1242 edge2 = edge->link;
1243 seg2 = seg->link;
1244
1245 if ( is_serif )
1246 {
1247 seg2 = seg->serif;
1248 edge2 = edge->serif;
1249 }
1250
1251 if ( edge2 )
1252 {
1253 FT_Pos edge_delta;
1254 FT_Pos seg_delta;
1255
1256
1257 edge_delta = edge->fpos - edge2->fpos;
1258 if ( edge_delta < 0 )
1259 edge_delta = -edge_delta;
1260
1261 seg_delta = seg->pos - seg2->pos;
1262 if ( seg_delta < 0 )
1263 seg_delta = -seg_delta;
1264
1265 if ( seg_delta < edge_delta )
1266 edge2 = seg2->edge;
1267 }
1268 else
1269 edge2 = seg2->edge;
1270
1271 if ( is_serif )
1272 {
1273 edge->serif = edge2;
1274 edge2->flags |= AF_EDGE_SERIF;
1275 }
1276 else
1277 edge->link = edge2;
1278 }
1279
1280 seg = seg->edge_next;
1281
1282 } while ( seg != edge->first );
1283
1284 /* set the round/straight flags */
1285 edge->flags = AF_EDGE_NORMAL;
1286
1287 if ( is_round > 0 && is_round >= is_straight )
1288 edge->flags |= AF_EDGE_ROUND;
1289
1290 #if 0
1291 /* set the edge's main direction */
1292 edge->dir = AF_DIR_NONE;
1293
1294 if ( ups > downs )
1295 edge->dir = (FT_Char)up_dir;
1296
1297 else if ( ups < downs )
1298 edge->dir = (FT_Char)-up_dir;
1299
1300 else if ( ups == downs )
1301 edge->dir = 0; /* both up and down! */
1302 #endif
1303
1304 /* gets rid of serifs if link is set */
1305 /* XXX: This gets rid of many unpleasant artefacts! */
1306 /* Example: the `c' in cour.pfa at size 13 */
1307
1308 if ( edge->serif && edge->link )
1309 edge->serif = 0;
1310 }
1311 }
1312
1313 Exit:
1314 return error;
1315 }
1316
1317
1318 FT_LOCAL_DEF( FT_Error )
1319 af_latin2_hints_detect_features( AF_GlyphHints hints,
1320 AF_Dimension dim )
1321 {
1322 FT_Error error;
1323
1324
1325 error = af_latin2_hints_compute_segments( hints, dim );
1326 if ( !error )
1327 {
1328 af_latin2_hints_link_segments( hints, dim );
1329
1330 error = af_latin2_hints_compute_edges( hints, dim );
1331 }
1332 return error;
1333 }
1334
1335
1336 FT_LOCAL_DEF( void )
1337 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints,
1338 AF_LatinMetrics metrics )
1339 {
1340 AF_AxisHints axis = &hints->axis[ AF_DIMENSION_VERT ];
1341 AF_Edge edge = axis->edges;
1342 AF_Edge edge_limit = edge + axis->num_edges;
1343 AF_LatinAxis latin = &metrics->axis[ AF_DIMENSION_VERT ];
1344 FT_Fixed scale = latin->scale;
1345 FT_Pos best_dist0; /* initial threshold */
1346
1347
1348 /* compute the initial threshold as a fraction of the EM size */
1349 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
1350
1351 if ( best_dist0 > 64 / 2 )
1352 best_dist0 = 64 / 2;
1353
1354 /* compute which blue zones are active, i.e. have their scaled */
1355 /* size < 3/4 pixels */
1356
1357 /* for each horizontal edge search the blue zone which is closest */
1358 for ( ; edge < edge_limit; edge++ )
1359 {
1360 FT_Int bb;
1361 AF_Width best_blue = NULL;
1362 FT_Pos best_dist = best_dist0;
1363
1364 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
1365 {
1366 AF_LatinBlue blue = latin->blues + bb;
1367 FT_Bool is_top_blue, is_major_dir;
1368
1369
1370 /* skip inactive blue zones (i.e., those that are too small) */
1371 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) )
1372 continue;
1373
1374 /* if it is a top zone, check for right edges -- if it is a bottom */
1375 /* zone, check for left edges */
1376 /* */
1377 /* of course, that's for TrueType */
1378 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 );
1379 is_major_dir = FT_BOOL( edge->dir == axis->major_dir );
1380
1381 /* if it is a top zone, the edge must be against the major */
1382 /* direction; if it is a bottom zone, it must be in the major */
1383 /* direction */
1384 if ( is_top_blue ^ is_major_dir )
1385 {
1386 FT_Pos dist;
1387 AF_Width compare;
1388
1389
1390 /* if it's a rounded edge, compare it to the overshoot position */
1391 /* if it's a flat edge, compare it to the reference position */
1392 if ( edge->flags & AF_EDGE_ROUND )
1393 compare = &blue->shoot;
1394 else
1395 compare = &blue->ref;
1396
1397 dist = edge->fpos - compare->org;
1398 if (dist < 0)
1399 dist = -dist;
1400
1401 dist = FT_MulFix( dist, scale );
1402 if ( dist < best_dist )
1403 {
1404 best_dist = dist;
1405 best_blue = compare;
1406 }
1407
1408 #if 0
1409 /* now, compare it to the overshoot position if the edge is */
1410 /* rounded, and if the edge is over the reference position of a */
1411 /* top zone, or under the reference position of a bottom zone */
1412 if ( edge->flags & AF_EDGE_ROUND && dist != 0 )
1413 {
1414 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org );
1415
1416
1417 if ( is_top_blue ^ is_under_ref )
1418 {
1419 blue = latin->blues + bb;
1420 dist = edge->fpos - blue->shoot.org;
1421 if ( dist < 0 )
1422 dist = -dist;
1423
1424 dist = FT_MulFix( dist, scale );
1425 if ( dist < best_dist )
1426 {
1427 best_dist = dist;
1428 best_blue = & blue->shoot;
1429 }
1430 }
1431 }
1432 #endif
1433 }
1434 }
1435
1436 if ( best_blue )
1437 edge->blue_edge = best_blue;
1438 }
1439 }
1440
1441
1442 static FT_Error
1443 af_latin2_hints_init( AF_GlyphHints hints,
1444 AF_LatinMetrics metrics )
1445 {
1446 FT_Render_Mode mode;
1447 FT_UInt32 scaler_flags, other_flags;
1448 FT_Face face = metrics->root.scaler.face;
1449
1450
1451 af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );
1452
1453 /*
1454 * correct x_scale and y_scale if needed, since they may have
1455 * been modified `af_latin2_metrics_scale_dim' above
1456 */
1457 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
1458 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
1459 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
1460 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
1461
1462 /* compute flags depending on render mode, etc. */
1463 mode = metrics->root.scaler.render_mode;
1464
1465 #if 0 /* #ifdef AF_USE_WARPER */
1466 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
1467 {
1468 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
1469 }
1470 #endif
1471
1472 scaler_flags = hints->scaler_flags;
1473 other_flags = 0;
1474
1475 /*
1476 * We snap the width of vertical stems for the monochrome and
1477 * horizontal LCD rendering targets only.
1478 */
1479 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
1480 other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
1481
1482 /*
1483 * We snap the width of horizontal stems for the monochrome and
1484 * vertical LCD rendering targets only.
1485 */
1486 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
1487 other_flags |= AF_LATIN_HINTS_VERT_SNAP;
1488
1489 /*
1490 * We adjust stems to full pixels only if we don't use the `light' mode.
1491 */
1492 if ( mode != FT_RENDER_MODE_LIGHT )
1493 other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
1494
1495 if ( mode == FT_RENDER_MODE_MONO )
1496 other_flags |= AF_LATIN_HINTS_MONO;
1497
1498 /*
1499 * In `light' hinting mode we disable horizontal hinting completely.
1500 * We also do it if the face is italic.
1501 */
1502 if ( mode == FT_RENDER_MODE_LIGHT ||
1503 (face->style_flags & FT_STYLE_FLAG_ITALIC) != 0 )
1504 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL;
1505
1506 hints->scaler_flags = scaler_flags;
1507 hints->other_flags = other_flags;
1508
1509 return 0;
1510 }
1511
1512
1513 /*************************************************************************/
1514 /*************************************************************************/
1515 /***** *****/
1516 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/
1517 /***** *****/
1518 /*************************************************************************/
1519 /*************************************************************************/
1520
1521 /* snap a given width in scaled coordinates to one of the */
1522 /* current standard widths */
1523
1524 static FT_Pos
1525 af_latin2_snap_width( AF_Width widths,
1526 FT_Int count,
1527 FT_Pos width )
1528 {
1529 int n;
1530 FT_Pos best = 64 + 32 + 2;
1531 FT_Pos reference = width;
1532 FT_Pos scaled;
1533
1534
1535 for ( n = 0; n < count; n++ )
1536 {
1537 FT_Pos w;
1538 FT_Pos dist;
1539
1540
1541 w = widths[n].cur;
1542 dist = width - w;
1543 if ( dist < 0 )
1544 dist = -dist;
1545 if ( dist < best )
1546 {
1547 best = dist;
1548 reference = w;
1549 }
1550 }
1551
1552 scaled = FT_PIX_ROUND( reference );
1553
1554 if ( width >= reference )
1555 {
1556 if ( width < scaled + 48 )
1557 width = reference;
1558 }
1559 else
1560 {
1561 if ( width > scaled - 48 )
1562 width = reference;
1563 }
1564
1565 return width;
1566 }
1567
1568
1569 /* compute the snapped width of a given stem */
1570
1571 static FT_Pos
1572 af_latin2_compute_stem_width( AF_GlyphHints hints,
1573 AF_Dimension dim,
1574 FT_Pos width,
1575 AF_Edge_Flags base_flags,
1576 AF_Edge_Flags stem_flags )
1577 {
1578 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics;
1579 AF_LatinAxis axis = & metrics->axis[dim];
1580 FT_Pos dist = width;
1581 FT_Int sign = 0;
1582 FT_Int vertical = ( dim == AF_DIMENSION_VERT );
1583
1584
1585 FT_UNUSED(base_flags);
1586
1587 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||
1588 axis->extra_light )
1589 return width;
1590
1591 if ( dist < 0 )
1592 {
1593 dist = -width;
1594 sign = 1;
1595 }
1596
1597 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
1598 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
1599 {
1600 /* smooth hinting process: very lightly quantize the stem width */
1601
1602 /* leave the widths of serifs alone */
1603
1604 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) )
1605 goto Done_Width;
1606
1607 #if 0
1608 else if ( ( base_flags & AF_EDGE_ROUND ) )
1609 {
1610 if ( dist < 80 )
1611 dist = 64;
1612 }
1613 else if ( dist < 56 )
1614 dist = 56;
1615 #endif
1616 if ( axis->width_count > 0 )
1617 {
1618 FT_Pos delta;
1619
1620
1621 /* compare to standard width */
1622 if ( axis->width_count > 0 )
1623 {
1624 delta = dist - axis->widths[0].cur;
1625
1626 if ( delta < 0 )
1627 delta = -delta;
1628
1629 if ( delta < 40 )
1630 {
1631 dist = axis->widths[0].cur;
1632 if ( dist < 48 )
1633 dist = 48;
1634
1635 goto Done_Width;
1636 }
1637 }
1638
1639 if ( dist < 3 * 64 )
1640 {
1641 delta = dist & 63;
1642 dist &= -64;
1643
1644 if ( delta < 10 )
1645 dist += delta;
1646
1647 else if ( delta < 32 )
1648 dist += 10;
1649
1650 else if ( delta < 54 )
1651 dist += 54;
1652
1653 else
1654 dist += delta;
1655 }
1656 else
1657 dist = ( dist + 32 ) & ~63;
1658 }
1659 }
1660 else
1661 {
1662 /* strong hinting process: snap the stem width to integer pixels */
1663 FT_Pos org_dist = dist;
1664
1665
1666 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist );
1667
1668 if ( vertical )
1669 {
1670 /* in the case of vertical hinting, always round */
1671 /* the stem heights to integer pixels */
1672
1673 if ( dist >= 64 )
1674 dist = ( dist + 16 ) & ~63;
1675 else
1676 dist = 64;
1677 }
1678 else
1679 {
1680 if ( AF_LATIN_HINTS_DO_MONO( hints ) )
1681 {
1682 /* monochrome horizontal hinting: snap widths to integer pixels */
1683 /* with a different threshold */
1684
1685 if ( dist < 64 )
1686 dist = 64;
1687 else
1688 dist = ( dist + 32 ) & ~63;
1689 }
1690 else
1691 {
1692 /* for horizontal anti-aliased hinting, we adopt a more subtle */
1693 /* approach: we strengthen small stems, round stems whose size */
1694 /* is between 1 and 2 pixels to an integer, otherwise nothing */
1695
1696 if ( dist < 48 )
1697 dist = ( dist + 64 ) >> 1;
1698
1699 else if ( dist < 128 )
1700 {
1701 /* We only round to an integer width if the corresponding */
1702 /* distortion is less than 1/4 pixel. Otherwise this */
1703 /* makes everything worse since the diagonals, which are */
1704 /* not hinted, appear a lot bolder or thinner than the */
1705 /* vertical stems. */
1706
1707 FT_Int delta;
1708
1709
1710 dist = ( dist + 22 ) & ~63;
1711 delta = dist - org_dist;
1712 if ( delta < 0 )
1713 delta = -delta;
1714
1715 if (delta >= 16)
1716 {
1717 dist = org_dist;
1718 if ( dist < 48 )
1719 dist = ( dist + 64 ) >> 1;
1720 }
1721 }
1722 else
1723 /* round otherwise to prevent color fringes in LCD mode */
1724 dist = ( dist + 32 ) & ~63;
1725 }
1726 }
1727 }
1728
1729 Done_Width:
1730 if ( sign )
1731 dist = -dist;
1732
1733 return dist;
1734 }
1735
1736
1737 /* align one stem edge relative to the previous stem edge */
1738
1739 static void
1740 af_latin2_align_linked_edge( AF_GlyphHints hints,
1741 AF_Dimension dim,
1742 AF_Edge base_edge,
1743 AF_Edge stem_edge )
1744 {
1745 FT_Pos dist = stem_edge->opos - base_edge->opos;
1746
1747 FT_Pos fitted_width = af_latin2_compute_stem_width(
1748 hints, dim, dist,
1749 (AF_Edge_Flags)base_edge->flags,
1750 (AF_Edge_Flags)stem_edge->flags );
1751
1752
1753 stem_edge->pos = base_edge->pos + fitted_width;
1754
1755 AF_LOG(( "LINK: edge %d (opos=%.2f) linked to (%.2f), "
1756 "dist was %.2f, now %.2f\n",
1757 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0,
1758 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 ));
1759 }
1760
1761
1762 static void
1763 af_latin2_align_serif_edge( AF_GlyphHints hints,
1764 AF_Edge base,
1765 AF_Edge serif )
1766 {
1767 FT_UNUSED( hints );
1768
1769 serif->pos = base->pos + (serif->opos - base->opos);
1770 }
1771
1772
1773 /*************************************************************************/
1774 /*************************************************************************/
1775 /*************************************************************************/
1776 /**** ****/
1777 /**** E D G E H I N T I N G ****/
1778 /**** ****/
1779 /*************************************************************************/
1780 /*************************************************************************/
1781 /*************************************************************************/
1782
1783
1784 FT_LOCAL_DEF( void )
1785 af_latin2_hint_edges( AF_GlyphHints hints,
1786 AF_Dimension dim )
1787 {
1788 AF_AxisHints axis = &hints->axis[dim];
1789 AF_Edge edges = axis->edges;
1790 AF_Edge edge_limit = edges + axis->num_edges;
1791 AF_Edge edge;
1792 AF_Edge anchor = 0;
1793 FT_Int has_serifs = 0;
1794 FT_Pos anchor_drift = 0;
1795
1796
1797
1798 AF_LOG(( "==== hinting %s edges =====\n", dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ));
1799
1800 /* we begin by aligning all stems relative to the blue zone */
1801 /* if needed -- that's only for horizontal edges */
1802
1803 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) )
1804 {
1805 for ( edge = edges; edge < edge_limit; edge++ )
1806 {
1807 AF_Width blue;
1808 AF_Edge edge1, edge2;
1809
1810
1811 if ( edge->flags & AF_EDGE_DONE )
1812 continue;
1813
1814 blue = edge->blue_edge;
1815 edge1 = NULL;
1816 edge2 = edge->link;
1817
1818 if ( blue )
1819 {
1820 edge1 = edge;
1821 }
1822 else if ( edge2 && edge2->blue_edge )
1823 {
1824 blue = edge2->blue_edge;
1825 edge1 = edge2;
1826 edge2 = edge;
1827 }
1828
1829 if ( !edge1 )
1830 continue;
1831
1832 AF_LOG(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), "
1833 "was (%.2f)\n",
1834 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0,
1835 edge1->pos / 64.0 ));
1836
1837 edge1->pos = blue->fit;
1838 edge1->flags |= AF_EDGE_DONE;
1839
1840 if ( edge2 && !edge2->blue_edge )
1841 {
1842 af_latin2_align_linked_edge( hints, dim, edge1, edge2 );
1843 edge2->flags |= AF_EDGE_DONE;
1844 }
1845
1846 if ( !anchor )
1847 {
1848 anchor = edge;
1849
1850 anchor_drift = (anchor->pos - anchor->opos);
1851 if (edge2)
1852 anchor_drift = (anchor_drift + (edge2->pos - edge2->opos)) >> 1;
1853 }
1854 }
1855 }
1856
1857 /* now we will align all stem edges, trying to maintain the */
1858 /* relative order of stems in the glyph */
1859 for ( edge = edges; edge < edge_limit; edge++ )
1860 {
1861 AF_Edge edge2;
1862
1863
1864 if ( edge->flags & AF_EDGE_DONE )
1865 continue;
1866
1867 /* skip all non-stem edges */
1868 edge2 = edge->link;
1869 if ( !edge2 )
1870 {
1871 has_serifs++;
1872 continue;
1873 }
1874
1875 /* now align the stem */
1876
1877 /* this should not happen, but it's better to be safe */
1878 if ( edge2->blue_edge )
1879 {
1880 AF_LOG(( "ASSERTION FAILED for edge %d\n", edge2-edges ));
1881
1882 af_latin2_align_linked_edge( hints, dim, edge2, edge );
1883 edge->flags |= AF_EDGE_DONE;
1884 continue;
1885 }
1886
1887 if ( !anchor )
1888 {
1889 FT_Pos org_len, org_center, cur_len;
1890 FT_Pos cur_pos1, error1, error2, u_off, d_off;
1891
1892
1893 org_len = edge2->opos - edge->opos;
1894 cur_len = af_latin2_compute_stem_width(
1895 hints, dim, org_len,
1896 (AF_Edge_Flags)edge->flags,
1897 (AF_Edge_Flags)edge2->flags );
1898 if ( cur_len <= 64 )
1899 u_off = d_off = 32;
1900 else
1901 {
1902 u_off = 38;
1903 d_off = 26;
1904 }
1905
1906 if ( cur_len < 96 )
1907 {
1908 org_center = edge->opos + ( org_len >> 1 );
1909
1910 cur_pos1 = FT_PIX_ROUND( org_center );
1911
1912 error1 = org_center - ( cur_pos1 - u_off );
1913 if ( error1 < 0 )
1914 error1 = -error1;
1915
1916 error2 = org_center - ( cur_pos1 + d_off );
1917 if ( error2 < 0 )
1918 error2 = -error2;
1919
1920 if ( error1 < error2 )
1921 cur_pos1 -= u_off;
1922 else
1923 cur_pos1 += d_off;
1924
1925 edge->pos = cur_pos1 - cur_len / 2;
1926 edge2->pos = edge->pos + cur_len;
1927 }
1928 else
1929 edge->pos = FT_PIX_ROUND( edge->opos );
1930
1931 AF_LOG(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f) "
1932 "snapped to (%.2f) (%.2f)\n",
1933 edge-edges, edge->opos / 64.0,
1934 edge2-edges, edge2->opos / 64.0,
1935 edge->pos / 64.0, edge2->pos / 64.0 ));
1936 anchor = edge;
1937
1938 edge->flags |= AF_EDGE_DONE;
1939
1940 af_latin2_align_linked_edge( hints, dim, edge, edge2 );
1941
1942 edge2->flags |= AF_EDGE_DONE;
1943
1944 anchor_drift = ( (anchor->pos - anchor->opos) +
1945 (edge2->pos - edge2->opos)) >> 1;
1946
1947 AF_LOG(( "DRIFT: %.2f\n", anchor_drift/64.0 ));
1948 }
1949 else
1950 {
1951 FT_Pos org_pos, org_len, org_center, cur_center, cur_len;
1952 FT_Pos org_left, org_right;
1953
1954
1955 org_pos = edge->opos + anchor_drift;
1956 org_len = edge2->opos - edge->opos;
1957 org_center = org_pos + ( org_len >> 1 );
1958
1959 cur_len = af_latin2_compute_stem_width(
1960 hints, dim, org_len,
1961 (AF_Edge_Flags)edge->flags,
1962 (AF_Edge_Flags)edge2->flags );
1963
1964 org_left = org_pos + ((org_len - cur_len) >> 1);
1965 org_right = org_pos + ((org_len + cur_len) >> 1);
1966
1967 AF_LOG(( "ALIGN: left=%.2f right=%.2f ", org_left/64.0, org_right/64.0 ));
1968 cur_center = org_center;
1969
1970 if ( edge2->flags & AF_EDGE_DONE )
1971 {
1972 AF_LOG(( "\n" ));
1973 edge->pos = edge2->pos - cur_len;
1974 }
1975 else
1976 {
1977 /* we want to compare several displacement, and choose
1978 * the one that increases fitness while minimizing
1979 * distortion as well
1980 */
1981 FT_Pos displacements[6], scores[6], org, fit, delta;
1982 FT_UInt count = 0;
1983
1984 /* note: don't even try to fit tiny stems */
1985 if ( cur_len < 32 )
1986 {
1987 AF_LOG(( "tiny stem\n" ));
1988 goto AlignStem;
1989 }
1990
1991 /* if the span is within a single pixel, don't touch it */
1992 if ( FT_PIX_FLOOR(org_left) == FT_PIX_CEIL(org_right) )
1993 {
1994 AF_LOG(( "single pixel stem\n" ));
1995 goto AlignStem;
1996 }
1997
1998 if (cur_len <= 96)
1999 {
2000 /* we want to avoid the absolute worst case which is
2001 * when the left and right edges of the span each represent
2002 * about 50% of the gray. we'd better want to change this
2003 * to 25/75%, since this is much more pleasant to the eye with
2004 * very acceptable distortion
2005 */
2006 FT_Pos frac_left = (org_left) & 63;
2007 FT_Pos frac_right = (org_right) & 63;
2008
2009 if ( frac_left >= 22 && frac_left <= 42 &&
2010 frac_right >= 22 && frac_right <= 42 )
2011 {
2012 org = frac_left;
2013 fit = (org <= 32) ? 16 : 48;
2014 delta = FT_ABS(fit - org);
2015 displacements[count] = fit - org;
2016 scores[count++] = delta;
2017 AF_LOG(( "dispA=%.2f (%d) ", (fit - org)/64.0, delta ));
2018
2019 org = frac_right;
2020 fit = (org <= 32) ? 16 : 48;
2021 delta = FT_ABS(fit - org);
2022 displacements[count] = fit - org;
2023 scores[count++] = delta;
2024 AF_LOG(( "dispB=%.2f (%d) ", (fit - org)/64.0, delta ));
2025 }
2026 }
2027
2028 /* snapping the left edge to the grid */
2029 org = org_left;
2030 fit = FT_PIX_ROUND(org);
2031 delta = FT_ABS(fit - org);
2032 displacements[count] = fit - org;
2033 scores[count++] = delta;
2034 AF_LOG(( "dispC=%.2f (%d) ", (fit - org)/64.0, delta ));
2035
2036 /* snapping the right edge to the grid */
2037 org = org_right;
2038 fit = FT_PIX_ROUND(org);
2039 delta = FT_ABS(fit - org);
2040 displacements[count] = fit - org;
2041 scores[count++] = delta;
2042 AF_LOG(( "dispD=%.2f (%d) ", (fit - org)/64.0, delta ));
2043
2044 /* now find the best displacement */
2045 {
2046 FT_Pos best_score = scores[0];
2047 FT_Pos best_disp = displacements[0];
2048 FT_UInt nn;
2049
2050 for (nn = 1; nn < count; nn++)
2051 {
2052 if (scores[nn] < best_score)
2053 {
2054 best_score = scores[nn];
2055 best_disp = displacements[nn];
2056 }
2057 }
2058
2059 cur_center = org_center + best_disp;
2060 }
2061 AF_LOG(( "\n" ));
2062 }
2063
2064 AlignStem:
2065 edge->pos = cur_center - (cur_len >> 1);
2066 edge2->pos = edge->pos + cur_len;
2067
2068 AF_LOG(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f) "
2069 "snapped to (%.2f) and (%.2f), org_len = %.2f cur_len=%.2f\n",
2070 edge-edges, edge->opos / 64.0,
2071 edge2-edges, edge2->opos / 64.0,
2072 edge->pos / 64.0, edge2->pos / 64.0,
2073 org_len / 64.0, cur_len / 64.0 ));
2074
2075 edge->flags |= AF_EDGE_DONE;
2076 edge2->flags |= AF_EDGE_DONE;
2077
2078 if ( edge > edges && edge->pos < edge[-1].pos )
2079 {
2080 AF_LOG(( "BOUND: %d (pos=%.2f) to (%.2f)\n",
2081 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 ));
2082 edge->pos = edge[-1].pos;
2083 }
2084 }
2085 }
2086
2087 /* make sure that lowercase m's maintain their symmetry */
2088
2089 /* In general, lowercase m's have six vertical edges if they are sans */
2090 /* serif, or twelve if they are with serifs. This implementation is */
2091 /* based on that assumption, and seems to work very well with most */
2092 /* faces. However, if for a certain face this assumption is not */
2093 /* true, the m is just rendered like before. In addition, any stem */
2094 /* correction will only be applied to symmetrical glyphs (even if the */
2095 /* glyph is not an m), so the potential for unwanted distortion is */
2096 /* relatively low. */
2097
2098 /* We don't handle horizontal edges since we can't easily assure that */
2099 /* the third (lowest) stem aligns with the base line; it might end up */
2100 /* one pixel higher or lower. */
2101
2102 #if 0
2103 {
2104 FT_Int n_edges = edge_limit - edges;
2105
2106
2107 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
2108 {
2109 AF_Edge edge1, edge2, edge3;
2110 FT_Pos dist1, dist2, span, delta;
2111
2112
2113 if ( n_edges == 6 )
2114 {
2115 edge1 = edges;
2116 edge2 = edges + 2;
2117 edge3 = edges + 4;
2118 }
2119 else
2120 {
2121 edge1 = edges + 1;
2122 edge2 = edges + 5;
2123 edge3 = edges + 9;
2124 }
2125
2126 dist1 = edge2->opos - edge1->opos;
2127 dist2 = edge3->opos - edge2->opos;
2128
2129 span = dist1 - dist2;
2130 if ( span < 0 )
2131 span = -span;
2132
2133 if ( span < 8 )
2134 {
2135 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
2136 edge3->pos -= delta;
2137 if ( edge3->link )
2138 edge3->link->pos -= delta;
2139
2140 /* move the serifs along with the stem */
2141 if ( n_edges == 12 )
2142 {
2143 ( edges + 8 )->pos -= delta;
2144 ( edges + 11 )->pos -= delta;
2145 }
2146
2147 edge3->flags |= AF_EDGE_DONE;
2148 if ( edge3->link )
2149 edge3->link->flags |= AF_EDGE_DONE;
2150 }
2151 }
2152 }
2153 #endif
2154
2155 if ( has_serifs || !anchor )
2156 {
2157 /*
2158 * now hint the remaining edges (serifs and single) in order
2159 * to complete our processing
2160 */
2161 for ( edge = edges; edge < edge_limit; edge++ )
2162 {
2163 FT_Pos delta;
2164
2165
2166 if ( edge->flags & AF_EDGE_DONE )
2167 continue;
2168
2169 delta = 1000;
2170
2171 if ( edge->serif )
2172 {
2173 delta = edge->serif->opos - edge->opos;
2174 if ( delta < 0 )
2175 delta = -delta;
2176 }
2177
2178 if ( delta < 64 + 16 )
2179 {
2180 af_latin2_align_serif_edge( hints, edge->serif, edge );
2181 AF_LOG(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f) "
2182 "aligned to (%.2f)\n",
2183 edge-edges, edge->opos / 64.0,
2184 edge->serif - edges, edge->serif->opos / 64.0,
2185 edge->pos / 64.0 ));
2186 }
2187 else if ( !anchor )
2188 {
2189 AF_LOG(( "SERIF_ANCHOR: edge %d (opos=%.2f) snapped to (%.2f)\n",
2190 edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
2191 edge->pos = FT_PIX_ROUND( edge->opos );
2192 anchor = edge;
2193 }
2194 else
2195 {
2196 AF_Edge before, after;
2197
2198
2199 for ( before = edge - 1; before >= edges; before-- )
2200 if ( before->flags & AF_EDGE_DONE )
2201 break;
2202
2203 for ( after = edge + 1; after < edge_limit; after++ )
2204 if ( after->flags & AF_EDGE_DONE )
2205 break;
2206
2207 if ( before >= edges && before < edge &&
2208 after < edge_limit && after > edge )
2209 {
2210 if ( after->opos == before->opos )
2211 edge->pos = before->pos;
2212 else
2213 edge->pos = before->pos +
2214 FT_MulDiv( edge->opos - before->opos,
2215 after->pos - before->pos,
2216 after->opos - before->opos );
2217 AF_LOG(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f) from %d (opos=%.2f)\n",
2218 edge-edges, edge->opos / 64.0, edge->pos / 64.0, before - edges, before->opos / 64.0 ));
2219 }
2220 else
2221 {
2222 edge->pos = anchor->pos + (( edge->opos - anchor->opos + 16) & ~31);
2223
2224 AF_LOG(( "SERIF_LINK2: edge %d (opos=%.2f) snapped to (%.2f)\n",
2225 edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
2226 }
2227 }
2228
2229 edge->flags |= AF_EDGE_DONE;
2230
2231 if ( edge > edges && edge->pos < edge[-1].pos )
2232 edge->pos = edge[-1].pos;
2233
2234 if ( edge + 1 < edge_limit &&
2235 edge[1].flags & AF_EDGE_DONE &&
2236 edge->pos > edge[1].pos )
2237 edge->pos = edge[1].pos;
2238 }
2239 }
2240 }
2241
2242
2243 static FT_Error
2244 af_latin2_hints_apply( AF_GlyphHints hints,
2245 FT_Outline* outline,
2246 AF_LatinMetrics metrics )
2247 {
2248 FT_Error error;
2249 int dim;
2250
2251
2252 error = af_glyph_hints_reload( hints, outline, 1 );
2253 if ( error )
2254 goto Exit;
2255
2256 /* analyze glyph outline */
2257 #ifdef AF_USE_WARPER
2258 if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ||
2259 AF_HINTS_DO_HORIZONTAL( hints ) )
2260 #else
2261 if ( AF_HINTS_DO_HORIZONTAL( hints ) )
2262 #endif
2263 {
2264 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ );
2265 if ( error )
2266 goto Exit;
2267 }
2268
2269 if ( AF_HINTS_DO_VERTICAL( hints ) )
2270 {
2271 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT );
2272 if ( error )
2273 goto Exit;
2274
2275 af_latin2_hints_compute_blue_edges( hints, metrics );
2276 }
2277
2278 /* grid-fit the outline */
2279 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
2280 {
2281 #ifdef AF_USE_WARPER
2282 if ( ( dim == AF_DIMENSION_HORZ &&
2283 metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) )
2284 {
2285 AF_WarperRec warper;
2286 FT_Fixed scale;
2287 FT_Pos delta;
2288
2289
2290 af_warper_compute( &warper, hints, dim, &scale, &delta );
2291 af_glyph_hints_scale_dim( hints, dim, scale, delta );
2292 continue;
2293 }
2294 #endif
2295
2296 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
2297 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
2298 {
2299 af_latin2_hint_edges( hints, (AF_Dimension)dim );
2300 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim );
2301 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
2302 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
2303 }
2304 }
2305 af_glyph_hints_save( hints, outline );
2306
2307 Exit:
2308 return error;
2309 }
2310
2311
2312 /*************************************************************************/
2313 /*************************************************************************/
2314 /***** *****/
2315 /***** L A T I N S C R I P T C L A S S *****/
2316 /***** *****/
2317 /*************************************************************************/
2318 /*************************************************************************/
2319
2320
2321 static const AF_Script_UniRangeRec af_latin2_uniranges[] =
2322 {
2323 AF_UNIRANGE_REC( 32UL, 127UL ), /* XXX: TODO: Add new Unicode ranges here! */
2324 AF_UNIRANGE_REC( 160UL, 255UL ),
2325 AF_UNIRANGE_REC( 0UL, 0UL )
2326 };
2327
2328
2329 AF_DEFINE_SCRIPT_CLASS(af_latin2_script_class,
2330 AF_SCRIPT_LATIN2,
2331 af_latin2_uniranges,
2332
2333 sizeof( AF_LatinMetricsRec ),
2334
2335 (AF_Script_InitMetricsFunc) af_latin2_metrics_init,
2336 (AF_Script_ScaleMetricsFunc)af_latin2_metrics_scale,
2337 (AF_Script_DoneMetricsFunc) NULL,
2338
2339 (AF_Script_InitHintsFunc) af_latin2_hints_init,
2340 (AF_Script_ApplyHintsFunc) af_latin2_hints_apply
2341 )
2342
2343
2344 /* END */
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