1/* ATTENTION: This file doesn't compile. It is only here as a reference */
2/* of an alternative latin hinting algorithm that was always */
3/* marked as experimental. */
4
5
6/***************************************************************************/
7/* */
8/* aflatin2.c */
9/* */
10/* Auto-fitter hinting routines for latin writing system (body). */
11/* */
12/* Copyright 2003-2018 by */
13/* David Turner, Robert Wilhelm, and Werner Lemberg. */
14/* */
15/* This file is part of the FreeType project, and may only be used, */
16/* modified, and distributed under the terms of the FreeType project */
17/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
18/* this file you indicate that you have read the license and */
19/* understand and accept it fully. */
20/* */
21/***************************************************************************/
22
23
24#include FT_ADVANCES_H
25
26
27#ifdef FT_OPTION_AUTOFIT2
28
29#include "afglobal.h"
30#include "aflatin.h"
31#include "aflatin2.h"
32#include "aferrors.h"
33
34
35#ifdef AF_CONFIG_OPTION_USE_WARPER
36#include "afwarp.h"
37#endif
38
39
40 /*************************************************************************/
41 /* */
42 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
43 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
44 /* messages during execution. */
45 /* */
46#undef FT_COMPONENT
47#define FT_COMPONENT trace_aflatin2
48
49
50 FT_LOCAL_DEF( FT_Error )
51 af_latin2_hints_compute_segments( AF_GlyphHints hints,
52 AF_Dimension dim );
53
54 FT_LOCAL_DEF( void )
55 af_latin2_hints_link_segments( AF_GlyphHints hints,
56 AF_Dimension dim );
57
58 /*************************************************************************/
59 /*************************************************************************/
60 /***** *****/
61 /***** L A T I N G L O B A L M E T R I C S *****/
62 /***** *****/
63 /*************************************************************************/
64 /*************************************************************************/
65
66 FT_LOCAL_DEF( void )
67 af_latin2_metrics_init_widths( AF_LatinMetrics metrics,
68 FT_Face face )
69 {
70 /* scan the array of segments in each direction */
71 AF_GlyphHintsRec hints[1];
72
73
74 af_glyph_hints_init( hints, face->memory );
75
76 metrics->axis[AF_DIMENSION_HORZ].width_count = 0;
77 metrics->axis[AF_DIMENSION_VERT].width_count = 0;
78
79 {
80 FT_Error error;
81 FT_UInt glyph_index;
82 int dim;
83 AF_LatinMetricsRec dummy[1];
84 AF_Scaler scaler = &dummy->root.scaler;
85
86
87 glyph_index = FT_Get_Char_Index(
88 face,
89 metrics->root.style_class->standard_char );
90 if ( glyph_index == 0 )
91 goto Exit;
92
93 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
94 if ( error || face->glyph->outline.n_points <= 0 )
95 goto Exit;
96
97 FT_ZERO( dummy );
98
99 dummy->units_per_em = metrics->units_per_em;
100 scaler->x_scale = scaler->y_scale = 0x10000L;
101 scaler->x_delta = scaler->y_delta = 0;
102 scaler->face = face;
103 scaler->render_mode = FT_RENDER_MODE_NORMAL;
104 scaler->flags = 0;
105
106 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy );
107
108 error = af_glyph_hints_reload( hints, &face->glyph->outline );
109 if ( error )
110 goto Exit;
111
112 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
113 {
114 AF_LatinAxis axis = &metrics->axis[dim];
115 AF_AxisHints axhints = &hints->axis[dim];
116 AF_Segment seg, limit, link;
117 FT_UInt num_widths = 0;
118
119
120 error = af_latin2_hints_compute_segments( hints,
121 (AF_Dimension)dim );
122 if ( error )
123 goto Exit;
124
125 af_latin2_hints_link_segments( hints,
126 (AF_Dimension)dim );
127
128 seg = axhints->segments;
129 limit = seg + axhints->num_segments;
130
131 for ( ; seg < limit; seg++ )
132 {
133 link = seg->link;
134
135 /* we only consider stem segments there! */
136 if ( link && link->link == seg && link > seg )
137 {
138 FT_Pos dist;
139
140
141 dist = seg->pos - link->pos;
142 if ( dist < 0 )
143 dist = -dist;
144
145 if ( num_widths < AF_LATIN_MAX_WIDTHS )
146 axis->widths[num_widths++].org = dist;
147 }
148 }
149
150 af_sort_widths( num_widths, axis->widths );
151 axis->width_count = num_widths;
152 }
153
154 Exit:
155 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
156 {
157 AF_LatinAxis axis = &metrics->axis[dim];
158 FT_Pos stdw;
159
160
161 stdw = ( axis->width_count > 0 )
162 ? axis->widths[0].org
163 : AF_LATIN_CONSTANT( metrics, 50 );
164
165 /* let's try 20% of the smallest width */
166 axis->edge_distance_threshold = stdw / 5;
167 axis->standard_width = stdw;
168 axis->extra_light = 0;
169 }
170 }
171
172 af_glyph_hints_done( hints );
173 }
174
175
176
177#define AF_LATIN_MAX_TEST_CHARACTERS 12
178
179
180 static const char af_latin2_blue_chars[AF_LATIN_MAX_BLUES]
181 [AF_LATIN_MAX_TEST_CHARACTERS+1] =
182 {
183 "THEZOCQS",
184 "HEZLOCUS",
185 "fijkdbh",
186 "xzroesc",
187 "xzroesc",
188 "pqgjy"
189 };
190
191
192 static void
193 af_latin2_metrics_init_blues( AF_LatinMetrics metrics,
194 FT_Face face )
195 {
196 FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS];
197 FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS];
198 FT_Int num_flats;
199 FT_Int num_rounds;
200 FT_Int bb;
201 AF_LatinBlue blue;
202 FT_Error error;
203 AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT];
204 FT_GlyphSlot glyph = face->glyph;
205
206
207 /* we compute the blues simply by loading each character from the */
208 /* 'af_latin2_blue_chars[blues]' string, then compute its top-most or */
209 /* bottom-most points (depending on `AF_IS_TOP_BLUE') */
210
211 FT_TRACE5(( "blue zones computation\n"
212 "======================\n\n" ));
213
214 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
215 {
216 const char* p = af_latin2_blue_chars[bb];
217 const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS;
218 FT_Pos* blue_ref;
219 FT_Pos* blue_shoot;
220
221
222 FT_TRACE5(( "blue zone %d:\n", bb ));
223
224 num_flats = 0;
225 num_rounds = 0;
226
227 for ( ; p < limit && *p; p++ )
228 {
229 FT_UInt glyph_index;
230 FT_Int best_point, best_y, best_first, best_last;
231 FT_Vector* points;
232 FT_Bool round;
233
234
235 /* load the character in the face -- skip unknown or empty ones */
236 glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p );
237 if ( glyph_index == 0 )
238 continue;
239
240 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
241 if ( error || glyph->outline.n_points <= 0 )
242 continue;
243
244 /* now compute min or max point indices and coordinates */
245 points = glyph->outline.points;
246 best_point = -1;
247 best_y = 0; /* make compiler happy */
248 best_first = 0; /* ditto */
249 best_last = 0; /* ditto */
250
251 {
252 FT_Int nn;
253 FT_Int first = 0;
254 FT_Int last = -1;
255
256
257 for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ )
258 {
259 FT_Int old_best_point = best_point;
260 FT_Int pp;
261
262
263 last = glyph->outline.contours[nn];
264
265 /* Avoid single-point contours since they are never rasterized. */
266 /* In some fonts, they correspond to mark attachment points */
267 /* which are way outside of the glyph's real outline. */
268 if ( last == first )
269 continue;
270
271 if ( AF_LATIN_IS_TOP_BLUE( bb ) )
272 {
273 for ( pp = first; pp <= last; pp++ )
274 if ( best_point < 0 || points[pp].y > best_y )
275 {
276 best_point = pp;
277 best_y = points[pp].y;
278 }
279 }
280 else
281 {
282 for ( pp = first; pp <= last; pp++ )
283 if ( best_point < 0 || points[pp].y < best_y )
284 {
285 best_point = pp;
286 best_y = points[pp].y;
287 }
288 }
289
290 if ( best_point != old_best_point )
291 {
292 best_first = first;
293 best_last = last;
294 }
295 }
296 FT_TRACE5(( " %c %d", *p, best_y ));
297 }
298
299 /* now check whether the point belongs to a straight or round */
300 /* segment; we first need to find in which contour the extremum */
301 /* lies, then inspect its previous and next points */
302 {
303 FT_Pos best_x = points[best_point].x;
304 FT_Int start, end, prev, next;
305 FT_Pos dist;
306
307
308 /* now look for the previous and next points that are not on the */
309 /* same Y coordinate. Threshold the `closeness'... */
310 start = end = best_point;
311
312 do
313 {
314 prev = start - 1;
315 if ( prev < best_first )
316 prev = best_last;
317
318 dist = FT_ABS( points[prev].y - best_y );
319 /* accept a small distance or a small angle (both values are */
320 /* heuristic; value 20 corresponds to approx. 2.9 degrees) */
321 if ( dist > 5 )
322 if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist )
323 break;
324
325 start = prev;
326
327 } while ( start != best_point );
328
329 do
330 {
331 next = end + 1;
332 if ( next > best_last )
333 next = best_first;
334
335 dist = FT_ABS( points[next].y - best_y );
336 if ( dist > 5 )
337 if ( FT_ABS( points[next].x - best_x ) <= 20 * dist )
338 break;
339
340 end = next;
341
342 } while ( end != best_point );
343
344 /* now, set the `round' flag depending on the segment's kind */
345 round = FT_BOOL(
346 FT_CURVE_TAG( glyph->outline.tags[start] ) != FT_CURVE_TAG_ON ||
347 FT_CURVE_TAG( glyph->outline.tags[ end ] ) != FT_CURVE_TAG_ON );
348
349 FT_TRACE5(( " (%s)\n", round ? "round" : "flat" ));
350 }
351
352 if ( round )
353 rounds[num_rounds++] = best_y;
354 else
355 flats[num_flats++] = best_y;
356 }
357
358 if ( num_flats == 0 && num_rounds == 0 )
359 {
360 /*
361 * we couldn't find a single glyph to compute this blue zone,
362 * we will simply ignore it then
363 */
364 FT_TRACE5(( " empty\n" ));
365 continue;
366 }
367
368 /* we have computed the contents of the `rounds' and `flats' tables, */
369 /* now determine the reference and overshoot position of the blue -- */
370 /* we simply take the median value after a simple sort */
371 af_sort_pos( num_rounds, rounds );
372 af_sort_pos( num_flats, flats );
373
374 blue = & axis->blues[axis->blue_count];
375 blue_ref = & blue->ref.org;
376 blue_shoot = & blue->shoot.org;
377
378 axis->blue_count++;
379
380 if ( num_flats == 0 )
381 {
382 *blue_ref =
383 *blue_shoot = rounds[num_rounds / 2];
384 }
385 else if ( num_rounds == 0 )
386 {
387 *blue_ref =
388 *blue_shoot = flats[num_flats / 2];
389 }
390 else
391 {
392 *blue_ref = flats[num_flats / 2];
393 *blue_shoot = rounds[num_rounds / 2];
394 }
395
396 /* there are sometimes problems: if the overshoot position of top */
397 /* zones is under its reference position, or the opposite for bottom */
398 /* zones. We must thus check everything there and correct the errors */
399 if ( *blue_shoot != *blue_ref )
400 {
401 FT_Pos ref = *blue_ref;
402 FT_Pos shoot = *blue_shoot;
403 FT_Bool over_ref = FT_BOOL( shoot > ref );
404
405
406 if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref )
407 {
408 *blue_ref =
409 *blue_shoot = ( shoot + ref ) / 2;
410
411 FT_TRACE5(( " [overshoot smaller than reference,"
412 " taking mean value]\n" ));
413 }
414 }
415
416 blue->flags = 0;
417 if ( AF_LATIN_IS_TOP_BLUE( bb ) )
418 blue->flags |= AF_LATIN_BLUE_TOP;
419
420 /*
421 * The following flag is used later to adjust the y and x scales
422 * in order to optimize the pixel grid alignment of the top of small
423 * letters.
424 */
425 if ( AF_LATIN_IS_X_HEIGHT_BLUE( bb ) )
426 blue->flags |= AF_LATIN_BLUE_ADJUSTMENT;
427
428 FT_TRACE5(( " -> reference = %ld\n"
429 " overshoot = %ld\n",
430 *blue_ref, *blue_shoot ));
431 }
432
433 return;
434 }
435
436
437 FT_LOCAL_DEF( void )
438 af_latin2_metrics_check_digits( AF_LatinMetrics metrics,
439 FT_Face face )
440 {
441 FT_UInt i;
442 FT_Bool started = 0, same_width = 1;
443 FT_Fixed advance, old_advance = 0;
444
445
446 /* check whether all ASCII digits have the same advance width; */
447 /* digit `0' is 0x30 in all supported charmaps */
448 for ( i = 0x30; i <= 0x39; i++ )
449 {
450 FT_UInt glyph_index;
451
452
453 glyph_index = FT_Get_Char_Index( face, i );
454 if ( glyph_index == 0 )
455 continue;
456
457 if ( FT_Get_Advance( face, glyph_index,
458 FT_LOAD_NO_SCALE |
459 FT_LOAD_NO_HINTING |
460 FT_LOAD_IGNORE_TRANSFORM,
461 &advance ) )
462 continue;
463
464 if ( started )
465 {
466 if ( advance != old_advance )
467 {
468 same_width = 0;
469 break;
470 }
471 }
472 else
473 {
474 old_advance = advance;
475 started = 1;
476 }
477 }
478
479 metrics->root.digits_have_same_width = same_width;
480 }
481
482
483 FT_LOCAL_DEF( FT_Error )
484 af_latin2_metrics_init( AF_LatinMetrics metrics,
485 FT_Face face )
486 {
487 FT_Error error = FT_Err_Ok;
488 FT_CharMap oldmap = face->charmap;
489 FT_UInt ee;
490
491 static const FT_Encoding latin_encodings[] =
492 {
493 FT_ENCODING_UNICODE,
494 FT_ENCODING_APPLE_ROMAN,
495 FT_ENCODING_ADOBE_STANDARD,
496 FT_ENCODING_ADOBE_LATIN_1,
497 FT_ENCODING_NONE /* end of list */
498 };
499
500
501 metrics->units_per_em = face->units_per_EM;
502
503 /* do we have a latin charmap in there? */
504 for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ )
505 {
506 error = FT_Select_Charmap( face, latin_encodings[ee] );
507 if ( !error )
508 break;
509 }
510
511 if ( !error )
512 {
513 af_latin2_metrics_init_widths( metrics, face );
514 af_latin2_metrics_init_blues( metrics, face );
515 af_latin2_metrics_check_digits( metrics, face );
516 }
517
518 FT_Set_Charmap( face, oldmap );
519 return FT_Err_Ok;
520 }
521
522
523 static void
524 af_latin2_metrics_scale_dim( AF_LatinMetrics metrics,
525 AF_Scaler scaler,
526 AF_Dimension dim )
527 {
528 FT_Fixed scale;
529 FT_Pos delta;
530 AF_LatinAxis axis;
531 FT_UInt nn;
532
533
534 if ( dim == AF_DIMENSION_HORZ )
535 {
536 scale = scaler->x_scale;
537 delta = scaler->x_delta;
538 }
539 else
540 {
541 scale = scaler->y_scale;
542 delta = scaler->y_delta;
543 }
544
545 axis = &metrics->axis[dim];
546
547 if ( axis->org_scale == scale && axis->org_delta == delta )
548 return;
549
550 axis->org_scale = scale;
551 axis->org_delta = delta;
552
553 /*
554 * correct Y scale to optimize the alignment of the top of small
555 * letters to the pixel grid
556 */
557 if ( dim == AF_DIMENSION_VERT )
558 {
559 AF_LatinAxis vaxis = &metrics->axis[AF_DIMENSION_VERT];
560 AF_LatinBlue blue = NULL;
561
562
563 for ( nn = 0; nn < vaxis->blue_count; nn++ )
564 {
565 if ( vaxis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT )
566 {
567 blue = &vaxis->blues[nn];
568 break;
569 }
570 }
571
572 if ( blue )
573 {
574 FT_Pos scaled;
575 FT_Pos threshold;
576 FT_Pos fitted;
577 FT_UInt limit;
578 FT_UInt ppem;
579
580
581 scaled = FT_MulFix( blue->shoot.org, scaler->y_scale );
582 ppem = metrics->root.scaler.face->size->metrics.x_ppem;
583 limit = metrics->root.globals->increase_x_height;
584 threshold = 40;
585
586 /* if the `increase-x-height' property is active, */
587 /* we round up much more often */
588 if ( limit &&
589 ppem <= limit &&
590 ppem >= AF_PROP_INCREASE_X_HEIGHT_MIN )
591 threshold = 52;
592
593 fitted = ( scaled + threshold ) & ~63;
594
595#if 1
596 if ( scaled != fitted )
597 {
598 scale = FT_MulDiv( scale, fitted, scaled );
599 FT_TRACE5(( "== scaled x-top = %.2g"
600 " fitted = %.2g, scaling = %.4g\n",
601 scaled / 64.0, fitted / 64.0,
602 ( fitted * 1.0 ) / scaled ));
603 }
604#endif
605 }
606 }
607
608 axis->scale = scale;
609 axis->delta = delta;
610
611 if ( dim == AF_DIMENSION_HORZ )
612 {
613 metrics->root.scaler.x_scale = scale;
614 metrics->root.scaler.x_delta = delta;
615 }
616 else
617 {
618 metrics->root.scaler.y_scale = scale;
619 metrics->root.scaler.y_delta = delta;
620 }
621
622 /* scale the standard widths */
623 for ( nn = 0; nn < axis->width_count; nn++ )
624 {
625 AF_Width width = axis->widths + nn;
626
627
628 width->cur = FT_MulFix( width->org, scale );
629 width->fit = width->cur;
630 }
631
632 /* an extra-light axis corresponds to a standard width that is */
633 /* smaller than 5/8 pixels */
634 axis->extra_light =
635 (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );
636
637 if ( dim == AF_DIMENSION_VERT )
638 {
639 /* scale the blue zones */
640 for ( nn = 0; nn < axis->blue_count; nn++ )
641 {
642 AF_LatinBlue blue = &axis->blues[nn];
643 FT_Pos dist;
644
645
646 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
647 blue->ref.fit = blue->ref.cur;
648 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
649 blue->shoot.fit = blue->shoot.cur;
650 blue->flags &= ~AF_LATIN_BLUE_ACTIVE;
651
652 /* a blue zone is only active if it is less than 3/4 pixels tall */
653 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
654 if ( dist <= 48 && dist >= -48 )
655 {
656 FT_Pos delta1, delta2;
657
658 delta1 = blue->shoot.org - blue->ref.org;
659 delta2 = delta1;
660 if ( delta1 < 0 )
661 delta2 = -delta2;
662
663 delta2 = FT_MulFix( delta2, scale );
664
665 if ( delta2 < 32 )
666 delta2 = 0;
667 else if ( delta2 < 64 )
668 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
669 else
670 delta2 = FT_PIX_ROUND( delta2 );
671
672 if ( delta1 < 0 )
673 delta2 = -delta2;
674
675 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
676 blue->shoot.fit = blue->ref.fit + delta2;
677
678 FT_TRACE5(( ">> activating blue zone %d:"
679 " ref.cur=%.2g ref.fit=%.2g"
680 " shoot.cur=%.2g shoot.fit=%.2g\n",
681 nn, blue->ref.cur / 64.0, blue->ref.fit / 64.0,
682 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 ));
683
684 blue->flags |= AF_LATIN_BLUE_ACTIVE;
685 }
686 }
687 }
688 }
689
690
691 FT_LOCAL_DEF( void )
692 af_latin2_metrics_scale( AF_LatinMetrics metrics,
693 AF_Scaler scaler )
694 {
695 metrics->root.scaler.render_mode = scaler->render_mode;
696 metrics->root.scaler.face = scaler->face;
697 metrics->root.scaler.flags = scaler->flags;
698
699 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
700 af_latin2_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
701 }
702
703
704 /* Extract standard_width from writing system/script specific */
705 /* metrics class. */
706
707 FT_LOCAL_DEF( void )
708 af_latin2_get_standard_widths( AF_LatinMetrics metrics,
709 FT_Pos* stdHW,
710 FT_Pos* stdVW )
711 {
712 if ( stdHW )
713 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width;
714
715 if ( stdVW )
716 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width;
717 }
718
719
720 /*************************************************************************/
721 /*************************************************************************/
722 /***** *****/
723 /***** L A T I N G L Y P H A N A L Y S I S *****/
724 /***** *****/
725 /*************************************************************************/
726 /*************************************************************************/
727
728#define SORT_SEGMENTS
729
730 FT_LOCAL_DEF( FT_Error )
731 af_latin2_hints_compute_segments( AF_GlyphHints hints,
732 AF_Dimension dim )
733 {
734 AF_AxisHints axis = &hints->axis[dim];
735 FT_Memory memory = hints->memory;
736 FT_Error error = FT_Err_Ok;
737 AF_Segment segment = NULL;
738 AF_SegmentRec seg0;
739 AF_Point* contour = hints->contours;
740 AF_Point* contour_limit = contour + hints->num_contours;
741 AF_Direction major_dir, segment_dir;
742
743
744 FT_ZERO( &seg0 );
745 seg0.score = 32000;
746 seg0.flags = AF_EDGE_NORMAL;
747
748 major_dir = (AF_Direction)FT_ABS( axis->major_dir );
749 segment_dir = major_dir;
750
751 axis->num_segments = 0;
752
753 /* set up (u,v) in each point */
754 if ( dim == AF_DIMENSION_HORZ )
755 {
756 AF_Point point = hints->points;
757 AF_Point limit = point + hints->num_points;
758
759
760 for ( ; point < limit; point++ )
761 {
762 point->u = point->fx;
763 point->v = point->fy;
764 }
765 }
766 else
767 {
768 AF_Point point = hints->points;
769 AF_Point limit = point + hints->num_points;
770
771
772 for ( ; point < limit; point++ )
773 {
774 point->u = point->fy;
775 point->v = point->fx;
776 }
777 }
778
779 /* do each contour separately */
780 for ( ; contour < contour_limit; contour++ )
781 {
782 AF_Point point = contour[0];
783 AF_Point start = point;
784 AF_Point last = point->prev;
785
786
787 if ( point == last ) /* skip singletons -- just in case */
788 continue;
789
790 /* already on an edge ?, backtrack to find its start */
791 if ( FT_ABS( point->in_dir ) == major_dir )
792 {
793 point = point->prev;
794
795 while ( point->in_dir == start->in_dir )
796 point = point->prev;
797 }
798 else /* otherwise, find first segment start, if any */
799 {
800 while ( FT_ABS( point->out_dir ) != major_dir )
801 {
802 point = point->next;
803
804 if ( point == start )
805 goto NextContour;
806 }
807 }
808
809 start = point;
810
811 for (;;)
812 {
813 AF_Point first;
814 FT_Pos min_u, min_v, max_u, max_v;
815
816 /* we're at the start of a new segment */
817 FT_ASSERT( FT_ABS( point->out_dir ) == major_dir &&
818 point->in_dir != point->out_dir );
819 first = point;
820
821 min_u = max_u = point->u;
822 min_v = max_v = point->v;
823
824 point = point->next;
825
826 while ( point->out_dir == first->out_dir )
827 {
828 point = point->next;
829
830 if ( point->u < min_u )
831 min_u = point->u;
832
833 if ( point->u > max_u )
834 max_u = point->u;
835 }
836
837 if ( point->v < min_v )
838 min_v = point->v;
839
840 if ( point->v > max_v )
841 max_v = point->v;
842
843 /* record new segment */
844 error = af_axis_hints_new_segment( axis, memory, &segment );
845 if ( error )
846 goto Exit;
847
848 segment[0] = seg0;
849 segment->dir = first->out_dir;
850 segment->first = first;
851 segment->last = point;
852 segment->pos = (FT_Short)( ( min_u + max_u ) >> 1 );
853 segment->min_coord = (FT_Short) min_v;
854 segment->max_coord = (FT_Short) max_v;
855 segment->height = (FT_Short)( max_v - min_v );
856
857 /* a segment is round if it doesn't have successive */
858 /* on-curve points. */
859 {
860 AF_Point pt = first;
861 AF_Point last = point;
862 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL;
863 FT_UInt f1;
864
865
866 segment->flags &= ~AF_EDGE_ROUND;
867
868 for ( ; pt != last; f0 = f1 )
869 {
870 pt = pt->next;
871 f1 = pt->flags & AF_FLAG_CONTROL;
872
873 if ( !f0 && !f1 )
874 break;
875
876 if ( pt == last )
877 segment->flags |= AF_EDGE_ROUND;
878 }
879 }
880
881 /* this can happen in the case of a degenerate contour
882 * e.g. a 2-point vertical contour
883 */
884 if ( point == start )
885 break;
886
887 /* jump to the start of the next segment, if any */
888 while ( FT_ABS( point->out_dir ) != major_dir )
889 {
890 point = point->next;
891
892 if ( point == start )
893 goto NextContour;
894 }
895 }
896
897 NextContour:
898 ;
899 } /* contours */
900
901 /* now slightly increase the height of segments when this makes */
902 /* sense -- this is used to better detect and ignore serifs */
903 {
904 AF_Segment segments = axis->segments;
905 AF_Segment segments_end = segments + axis->num_segments;
906
907
908 for ( segment = segments; segment < segments_end; segment++ )
909 {
910 AF_Point first = segment->first;
911 AF_Point last = segment->last;
912 AF_Point p;
913 FT_Pos first_v = first->v;
914 FT_Pos last_v = last->v;
915
916
917 if ( first_v < last_v )
918 {
919 p = first->prev;
920 if ( p->v < first_v )
921 segment->height = (FT_Short)( segment->height +
922 ( ( first_v - p->v ) >> 1 ) );
923
924 p = last->next;
925 if ( p->v > last_v )
926 segment->height = (FT_Short)( segment->height +
927 ( ( p->v - last_v ) >> 1 ) );
928 }
929 else
930 {
931 p = first->prev;
932 if ( p->v > first_v )
933 segment->height = (FT_Short)( segment->height +
934 ( ( p->v - first_v ) >> 1 ) );
935
936 p = last->next;
937 if ( p->v < last_v )
938 segment->height = (FT_Short)( segment->height +
939 ( ( last_v - p->v ) >> 1 ) );
940 }
941 }
942 }
943
944#ifdef AF_SORT_SEGMENTS
945 /* place all segments with a negative direction to the start
946 * of the array, used to speed up segment linking later...
947 */
948 {
949 AF_Segment segments = axis->segments;
950 FT_UInt count = axis->num_segments;
951 FT_UInt ii, jj;
952
953 for ( ii = 0; ii < count; ii++ )
954 {
955 if ( segments[ii].dir > 0 )
956 {
957 for ( jj = ii + 1; jj < count; jj++ )
958 {
959 if ( segments[jj].dir < 0 )
960 {
961 AF_SegmentRec tmp;
962
963
964 tmp = segments[ii];
965 segments[ii] = segments[jj];
966 segments[jj] = tmp;
967
968 break;
969 }
970 }
971
972 if ( jj == count )
973 break;
974 }
975 }
976 axis->mid_segments = ii;
977 }
978#endif
979
980 Exit:
981 return error;
982 }
983
984
985 FT_LOCAL_DEF( void )
986 af_latin2_hints_link_segments( AF_GlyphHints hints,
987 AF_Dimension dim )
988 {
989 AF_AxisHints axis = &hints->axis[dim];
990 AF_Segment segments = axis->segments;
991 AF_Segment segment_limit = segments + axis->num_segments;
992#ifdef AF_SORT_SEGMENTS
993 AF_Segment segment_mid = segments + axis->mid_segments;
994#endif
995 FT_Pos len_threshold, len_score;
996 AF_Segment seg1, seg2;
997
998
999 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
1000 if ( len_threshold == 0 )
1001 len_threshold = 1;
1002
1003 len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 );
1004
1005#ifdef AF_SORT_SEGMENTS
1006 for ( seg1 = segments; seg1 < segment_mid; seg1++ )
1007 {
1008 if ( seg1->dir != axis->major_dir )
1009 continue;
1010
1011 for ( seg2 = segment_mid; seg2 < segment_limit; seg2++ )
1012#else
1013 /* now compare each segment to the others */
1014 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
1015 {
1016 if ( seg1->dir != axis->major_dir )
1017 continue;
1018
1019 for ( seg2 = segments; seg2 < segment_limit; seg2++ )
1020 if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )
1021#endif
1022 {
1023 FT_Pos pos1 = seg1->pos;
1024 FT_Pos pos2 = seg2->pos;
1025 FT_Pos dist = pos2 - pos1;
1026
1027
1028 if ( dist < 0 )
1029 continue;
1030
1031 {
1032 FT_Pos min = seg1->min_coord;
1033 FT_Pos max = seg1->max_coord;
1034 FT_Pos len, score;
1035
1036
1037 if ( min < seg2->min_coord )
1038 min = seg2->min_coord;
1039
1040 if ( max > seg2->max_coord )
1041 max = seg2->max_coord;
1042
1043 len = max - min;
1044 if ( len >= len_threshold )
1045 {
1046 score = dist + len_score / len;
1047 if ( score < seg1->score )
1048 {
1049 seg1->score = score;
1050 seg1->link = seg2;
1051 }
1052
1053 if ( score < seg2->score )
1054 {
1055 seg2->score = score;
1056 seg2->link = seg1;
1057 }
1058 }
1059 }
1060 }
1061 }
1062#if 0
1063 }
1064#endif
1065
1066 /* now, compute the `serif' segments */
1067 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
1068 {
1069 seg2 = seg1->link;
1070
1071 if ( seg2 )
1072 {
1073 if ( seg2->link != seg1 )
1074 {
1075 seg1->link = NULL;
1076 seg1->serif = seg2->link;
1077 }
1078 }
1079 }
1080 }
1081
1082
1083 FT_LOCAL_DEF( FT_Error )
1084 af_latin2_hints_compute_edges( AF_GlyphHints hints,
1085 AF_Dimension dim )
1086 {
1087 AF_AxisHints axis = &hints->axis[dim];
1088 FT_Error error = FT_Err_Ok;
1089 FT_Memory memory = hints->memory;
1090 AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim];
1091
1092 AF_Segment segments = axis->segments;
1093 AF_Segment segment_limit = segments + axis->num_segments;
1094 AF_Segment seg;
1095
1096 AF_Direction up_dir;
1097 FT_Fixed scale;
1098 FT_Pos edge_distance_threshold;
1099 FT_Pos segment_length_threshold;
1100
1101
1102 axis->num_edges = 0;
1103
1104 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
1105 : hints->y_scale;
1106
1107 up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP
1108 : AF_DIR_RIGHT;
1109
1110 /*
1111 * We want to ignore very small (mostly serif) segments, we do that
1112 * by ignoring those that whose length is less than a given fraction
1113 * of the standard width. If there is no standard width, we ignore
1114 * those that are less than a given size in pixels
1115 *
1116 * also, unlink serif segments that are linked to segments farther
1117 * than 50% of the standard width
1118 */
1119 if ( dim == AF_DIMENSION_HORZ )
1120 {
1121 if ( laxis->width_count > 0 )
1122 segment_length_threshold = ( laxis->standard_width * 10 ) >> 4;
1123 else
1124 segment_length_threshold = FT_DivFix( 64, hints->y_scale );
1125 }
1126 else
1127 segment_length_threshold = 0;
1128
1129 /*********************************************************************/
1130 /* */
1131 /* We will begin by generating a sorted table of edges for the */
1132 /* current direction. To do so, we simply scan each segment and try */
1133 /* to find an edge in our table that corresponds to its position. */
1134 /* */
1135 /* If no edge is found, we create and insert a new edge in the */
1136 /* sorted table. Otherwise, we simply add the segment to the edge's */
1137 /* list which will be processed in the second step to compute the */
1138 /* edge's properties. */
1139 /* */
1140 /* Note that the edges table is sorted along the segment/edge */
1141 /* position. */
1142 /* */
1143 /*********************************************************************/
1144
1145 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
1146 scale );
1147 if ( edge_distance_threshold > 64 / 4 )
1148 edge_distance_threshold = 64 / 4;
1149
1150 edge_distance_threshold = FT_DivFix( edge_distance_threshold,
1151 scale );
1152
1153 for ( seg = segments; seg < segment_limit; seg++ )
1154 {
1155 AF_Edge found = NULL;
1156 FT_Int ee;
1157
1158
1159 if ( seg->height < segment_length_threshold )
1160 continue;
1161
1162 /* A special case for serif edges: If they are smaller than */
1163 /* 1.5 pixels we ignore them. */
1164 if ( seg->serif )
1165 {
1166 FT_Pos dist = seg->serif->pos - seg->pos;
1167
1168
1169 if ( dist < 0 )
1170 dist = -dist;
1171
1172 if ( dist >= laxis->standard_width >> 1 )
1173 {
1174 /* unlink this serif, it is too distant from its reference stem */
1175 seg->serif = NULL;
1176 }
1177 else if ( 2*seg->height < 3 * segment_length_threshold )
1178 continue;
1179 }
1180
1181 /* look for an edge corresponding to the segment */
1182 for ( ee = 0; ee < axis->num_edges; ee++ )
1183 {
1184 AF_Edge edge = axis->edges + ee;
1185 FT_Pos dist;
1186
1187
1188 dist = seg->pos - edge->fpos;
1189 if ( dist < 0 )
1190 dist = -dist;
1191
1192 if ( dist < edge_distance_threshold && edge->dir == seg->dir )
1193 {
1194 found = edge;
1195 break;
1196 }
1197 }
1198
1199 if ( !found )
1200 {
1201 AF_Edge edge;
1202
1203
1204 /* insert a new edge in the list and */
1205 /* sort according to the position */
1206 error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, 0,
1207 memory, &edge );
1208 if ( error )
1209 goto Exit;
1210
1211 /* add the segment to the new edge's list */
1212 FT_ZERO( edge );
1213
1214 edge->first = seg;
1215 edge->last = seg;
1216 edge->dir = seg->dir;
1217 edge->fpos = seg->pos;
1218 edge->opos = FT_MulFix( seg->pos, scale );
1219 edge->pos = edge->opos;
1220 seg->edge_next = seg;
1221 }
1222 else
1223 {
1224 /* if an edge was found, simply add the segment to the edge's */
1225 /* list */
1226 seg->edge_next = found->first;
1227 found->last->edge_next = seg;
1228 found->last = seg;
1229 }
1230 }
1231
1232
1233 /*********************************************************************/
1234 /* */
1235 /* Good, we will now compute each edge's properties according to */
1236 /* segments found on its position. Basically, these are: */
1237 /* */
1238 /* - edge's main direction */
1239 /* - stem edge, serif edge or both (which defaults to stem then) */
1240 /* - rounded edge, straight or both (which defaults to straight) */
1241 /* - link for edge */
1242 /* */
1243 /*********************************************************************/
1244
1245 /* first of all, set the `edge' field in each segment -- this is */
1246 /* required in order to compute edge links */
1247
1248 /*
1249 * Note that removing this loop and setting the `edge' field of each
1250 * segment directly in the code above slows down execution speed for
1251 * some reasons on platforms like the Sun.
1252 */
1253 {
1254 AF_Edge edges = axis->edges;
1255 AF_Edge edge_limit = edges + axis->num_edges;
1256 AF_Edge edge;
1257
1258
1259 for ( edge = edges; edge < edge_limit; edge++ )
1260 {
1261 seg = edge->first;
1262 if ( seg )
1263 do
1264 {
1265 seg->edge = edge;
1266 seg = seg->edge_next;
1267
1268 } while ( seg != edge->first );
1269 }
1270
1271 /* now, compute each edge properties */
1272 for ( edge = edges; edge < edge_limit; edge++ )
1273 {
1274 FT_Int is_round = 0; /* does it contain round segments? */
1275 FT_Int is_straight = 0; /* does it contain straight segments? */
1276#if 0
1277 FT_Pos ups = 0; /* number of upwards segments */
1278 FT_Pos downs = 0; /* number of downwards segments */
1279#endif
1280
1281
1282 seg = edge->first;
1283
1284 do
1285 {
1286 FT_Bool is_serif;
1287
1288
1289 /* check for roundness of segment */
1290 if ( seg->flags & AF_EDGE_ROUND )
1291 is_round++;
1292 else
1293 is_straight++;
1294
1295#if 0
1296 /* check for segment direction */
1297 if ( seg->dir == up_dir )
1298 ups += seg->max_coord-seg->min_coord;
1299 else
1300 downs += seg->max_coord-seg->min_coord;
1301#endif
1302
1303 /* check for links -- if seg->serif is set, then seg->link must */
1304 /* be ignored */
1305 is_serif = (FT_Bool)( seg->serif &&
1306 seg->serif->edge &&
1307 seg->serif->edge != edge );
1308
1309 if ( ( seg->link && seg->link->edge ) || is_serif )
1310 {
1311 AF_Edge edge2;
1312 AF_Segment seg2;
1313
1314
1315 edge2 = edge->link;
1316 seg2 = seg->link;
1317
1318 if ( is_serif )
1319 {
1320 seg2 = seg->serif;
1321 edge2 = edge->serif;
1322 }
1323
1324 if ( edge2 )
1325 {
1326 FT_Pos edge_delta;
1327 FT_Pos seg_delta;
1328
1329
1330 edge_delta = edge->fpos - edge2->fpos;
1331 if ( edge_delta < 0 )
1332 edge_delta = -edge_delta;
1333
1334 seg_delta = seg->pos - seg2->pos;
1335 if ( seg_delta < 0 )
1336 seg_delta = -seg_delta;
1337
1338 if ( seg_delta < edge_delta )
1339 edge2 = seg2->edge;
1340 }
1341 else
1342 edge2 = seg2->edge;
1343
1344 if ( is_serif )
1345 {
1346 edge->serif = edge2;
1347 edge2->flags |= AF_EDGE_SERIF;
1348 }
1349 else
1350 edge->link = edge2;
1351 }
1352
1353 seg = seg->edge_next;
1354
1355 } while ( seg != edge->first );
1356
1357 /* set the round/straight flags */
1358 edge->flags = AF_EDGE_NORMAL;
1359
1360 if ( is_round > 0 && is_round >= is_straight )
1361 edge->flags |= AF_EDGE_ROUND;
1362
1363#if 0
1364 /* set the edge's main direction */
1365 edge->dir = AF_DIR_NONE;
1366
1367 if ( ups > downs )
1368 edge->dir = (FT_Char)up_dir;
1369
1370 else if ( ups < downs )
1371 edge->dir = (FT_Char)-up_dir;
1372
1373 else if ( ups == downs )
1374 edge->dir = 0; /* both up and down! */
1375#endif
1376
1377 /* gets rid of serifs if link is set */
1378 /* XXX: This gets rid of many unpleasant artefacts! */
1379 /* Example: the `c' in cour.pfa at size 13 */
1380
1381 if ( edge->serif && edge->link )
1382 edge->serif = NULL;
1383 }
1384 }
1385
1386 Exit:
1387 return error;
1388 }
1389
1390
1391 FT_LOCAL_DEF( FT_Error )
1392 af_latin2_hints_detect_features( AF_GlyphHints hints,
1393 AF_Dimension dim )
1394 {
1395 FT_Error error;
1396
1397
1398 error = af_latin2_hints_compute_segments( hints, dim );
1399 if ( !error )
1400 {
1401 af_latin2_hints_link_segments( hints, dim );
1402
1403 error = af_latin2_hints_compute_edges( hints, dim );
1404 }
1405 return error;
1406 }
1407
1408
1409 static void
1410 af_latin2_hints_compute_blue_edges( AF_GlyphHints hints,
1411 AF_LatinMetrics metrics )
1412 {
1413 AF_AxisHints axis = &hints->axis[AF_DIMENSION_VERT];
1414 AF_Edge edge = axis->edges;
1415 AF_Edge edge_limit = edge + axis->num_edges;
1416 AF_LatinAxis latin = &metrics->axis[AF_DIMENSION_VERT];
1417 FT_Fixed scale = latin->scale;
1418 FT_Pos best_dist0; /* initial threshold */
1419
1420
1421 /* compute the initial threshold as a fraction of the EM size */
1422 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
1423
1424 if ( best_dist0 > 64 / 2 )
1425 best_dist0 = 64 / 2;
1426
1427 /* compute which blue zones are active, i.e. have their scaled */
1428 /* size < 3/4 pixels */
1429
1430 /* for each horizontal edge search the blue zone which is closest */
1431 for ( ; edge < edge_limit; edge++ )
1432 {
1433 FT_Int bb;
1434 AF_Width best_blue = NULL;
1435 FT_Pos best_dist = best_dist0;
1436
1437 for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
1438 {
1439 AF_LatinBlue blue = latin->blues + bb;
1440 FT_Bool is_top_blue, is_major_dir;
1441
1442
1443 /* skip inactive blue zones (i.e., those that are too small) */
1444 if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) )
1445 continue;
1446
1447 /* if it is a top zone, check for right edges -- if it is a bottom */
1448 /* zone, check for left edges */
1449 /* */
1450 /* of course, that's for TrueType */
1451 is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 );
1452 is_major_dir = FT_BOOL( edge->dir == axis->major_dir );
1453
1454 /* if it is a top zone, the edge must be against the major */
1455 /* direction; if it is a bottom zone, it must be in the major */
1456 /* direction */
1457 if ( is_top_blue ^ is_major_dir )
1458 {
1459 FT_Pos dist;
1460 AF_Width compare;
1461
1462
1463 /* if it's a rounded edge, compare it to the overshoot position */
1464 /* if it's a flat edge, compare it to the reference position */
1465 if ( edge->flags & AF_EDGE_ROUND )
1466 compare = &blue->shoot;
1467 else
1468 compare = &blue->ref;
1469
1470 dist = edge->fpos - compare->org;
1471 if ( dist < 0 )
1472 dist = -dist;
1473
1474 dist = FT_MulFix( dist, scale );
1475 if ( dist < best_dist )
1476 {
1477 best_dist = dist;
1478 best_blue = compare;
1479 }
1480
1481#if 0
1482 /* now, compare it to the overshoot position if the edge is */
1483 /* rounded, and if the edge is over the reference position of a */
1484 /* top zone, or under the reference position of a bottom zone */
1485 if ( edge->flags & AF_EDGE_ROUND && dist != 0 )
1486 {
1487 FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org );
1488
1489
1490 if ( is_top_blue ^ is_under_ref )
1491 {
1492 blue = latin->blues + bb;
1493 dist = edge->fpos - blue->shoot.org;
1494 if ( dist < 0 )
1495 dist = -dist;
1496
1497 dist = FT_MulFix( dist, scale );
1498 if ( dist < best_dist )
1499 {
1500 best_dist = dist;
1501 best_blue = & blue->shoot;
1502 }
1503 }
1504 }
1505#endif
1506 }
1507 }
1508
1509 if ( best_blue )
1510 edge->blue_edge = best_blue;
1511 }
1512 }
1513
1514
1515 static FT_Error
1516 af_latin2_hints_init( AF_GlyphHints hints,
1517 AF_LatinMetrics metrics )
1518 {
1519 FT_Render_Mode mode;
1520 FT_UInt32 scaler_flags, other_flags;
1521 FT_Face face = metrics->root.scaler.face;
1522
1523
1524 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics );
1525
1526 /*
1527 * correct x_scale and y_scale if needed, since they may have
1528 * been modified `af_latin2_metrics_scale_dim' above
1529 */
1530 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
1531 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
1532 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
1533 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
1534
1535 /* compute flags depending on render mode, etc. */
1536 mode = metrics->root.scaler.render_mode;
1537
1538#if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */
1539 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
1540 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
1541#endif
1542
1543 scaler_flags = hints->scaler_flags;
1544 other_flags = 0;
1545
1546 /*
1547 * We snap the width of vertical stems for the monochrome and
1548 * horizontal LCD rendering targets only.
1549 */
1550 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
1551 other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
1552
1553 /*
1554 * We snap the width of horizontal stems for the monochrome and
1555 * vertical LCD rendering targets only.
1556 */
1557 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
1558 other_flags |= AF_LATIN_HINTS_VERT_SNAP;
1559
1560 /*
1561 * We adjust stems to full pixels unless in `light' or `lcd' mode.
1562 */
1563 if ( mode != FT_RENDER_MODE_LIGHT && mode != FT_RENDER_MODE_LCD )
1564 other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
1565
1566 if ( mode == FT_RENDER_MODE_MONO )
1567 other_flags |= AF_LATIN_HINTS_MONO;
1568
1569 /*
1570 * In `light' or `lcd' mode we disable horizontal hinting completely.
1571 * We also do it if the face is italic.
1572 */
1573 if ( mode == FT_RENDER_MODE_LIGHT || mode == FT_RENDER_MODE_LCD ||
1574 ( face->style_flags & FT_STYLE_FLAG_ITALIC ) != 0 )
1575 scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL;
1576
1577#ifdef AF_CONFIG_OPTION_USE_WARPER
1578 /* get (global) warper flag */
1579 if ( !metrics->root.globals->module->warping )
1580 scaler_flags |= AF_SCALER_FLAG_NO_WARPER;
1581#endif
1582
1583 hints->scaler_flags = scaler_flags;
1584 hints->other_flags = other_flags;
1585
1586 return 0;
1587 }
1588
1589
1590 /*************************************************************************/
1591 /*************************************************************************/
1592 /***** *****/
1593 /***** L A T I N G L Y P H G R I D - F I T T I N G *****/
1594 /***** *****/
1595 /*************************************************************************/
1596 /*************************************************************************/
1597
1598 /* snap a given width in scaled coordinates to one of the */
1599 /* current standard widths */
1600
1601 static FT_Pos
1602 af_latin2_snap_width( AF_Width widths,
1603 FT_UInt count,
1604 FT_Pos width )
1605 {
1606 FT_UInt n;
1607 FT_Pos best = 64 + 32 + 2;
1608 FT_Pos reference = width;
1609 FT_Pos scaled;
1610
1611
1612 for ( n = 0; n < count; n++ )
1613 {
1614 FT_Pos w;
1615 FT_Pos dist;
1616
1617
1618 w = widths[n].cur;
1619 dist = width - w;
1620 if ( dist < 0 )
1621 dist = -dist;
1622 if ( dist < best )
1623 {
1624 best = dist;
1625 reference = w;
1626 }
1627 }
1628
1629 scaled = FT_PIX_ROUND( reference );
1630
1631 if ( width >= reference )
1632 {
1633 if ( width < scaled + 48 )
1634 width = reference;
1635 }
1636 else
1637 {
1638 if ( width > scaled - 48 )
1639 width = reference;
1640 }
1641
1642 return width;
1643 }
1644
1645
1646 /* compute the snapped width of a given stem */
1647
1648 static FT_Pos
1649 af_latin2_compute_stem_width( AF_GlyphHints hints,
1650 AF_Dimension dim,
1651 FT_Pos width,
1652 FT_UInt base_flags,
1653 FT_UInt stem_flags )
1654 {
1655 AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics;
1656 AF_LatinAxis axis = & metrics->axis[dim];
1657 FT_Pos dist = width;
1658 FT_Int sign = 0;
1659 FT_Int vertical = ( dim == AF_DIMENSION_VERT );
1660
1661 FT_UNUSED( base_flags );
1662
1663
1664 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||
1665 axis->extra_light )
1666 return width;
1667
1668 if ( dist < 0 )
1669 {
1670 dist = -width;
1671 sign = 1;
1672 }
1673
1674 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
1675 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
1676 {
1677 /* smooth hinting process: very lightly quantize the stem width */
1678
1679 /* leave the widths of serifs alone */
1680
1681 if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) )
1682 goto Done_Width;
1683
1684#if 0
1685 else if ( ( base_flags & AF_EDGE_ROUND ) )
1686 {
1687 if ( dist < 80 )
1688 dist = 64;
1689 }
1690 else if ( dist < 56 )
1691 dist = 56;
1692#endif
1693 if ( axis->width_count > 0 )
1694 {
1695 FT_Pos delta;
1696
1697
1698 /* compare to standard width */
1699 if ( axis->width_count > 0 )
1700 {
1701 delta = dist - axis->widths[0].cur;
1702
1703 if ( delta < 0 )
1704 delta = -delta;
1705
1706 if ( delta < 40 )
1707 {
1708 dist = axis->widths[0].cur;
1709 if ( dist < 48 )
1710 dist = 48;
1711
1712 goto Done_Width;
1713 }
1714 }
1715
1716 if ( dist < 3 * 64 )
1717 {
1718 delta = dist & 63;
1719 dist &= -64;
1720
1721 if ( delta < 10 )
1722 dist += delta;
1723
1724 else if ( delta < 32 )
1725 dist += 10;
1726
1727 else if ( delta < 54 )
1728 dist += 54;
1729
1730 else
1731 dist += delta;
1732 }
1733 else
1734 dist = ( dist + 32 ) & ~63;
1735 }
1736 }
1737 else
1738 {
1739 /* strong hinting process: snap the stem width to integer pixels */
1740 FT_Pos org_dist = dist;
1741
1742
1743 dist = af_latin2_snap_width( axis->widths, axis->width_count, dist );
1744
1745 if ( vertical )
1746 {
1747 /* in the case of vertical hinting, always round */
1748 /* the stem heights to integer pixels */
1749
1750 if ( dist >= 64 )
1751 dist = ( dist + 16 ) & ~63;
1752 else
1753 dist = 64;
1754 }
1755 else
1756 {
1757 if ( AF_LATIN_HINTS_DO_MONO( hints ) )
1758 {
1759 /* monochrome horizontal hinting: snap widths to integer pixels */
1760 /* with a different threshold */
1761
1762 if ( dist < 64 )
1763 dist = 64;
1764 else
1765 dist = ( dist + 32 ) & ~63;
1766 }
1767 else
1768 {
1769 /* for horizontal anti-aliased hinting, we adopt a more subtle */
1770 /* approach: we strengthen small stems, round stems whose size */
1771 /* is between 1 and 2 pixels to an integer, otherwise nothing */
1772
1773 if ( dist < 48 )
1774 dist = ( dist + 64 ) >> 1;
1775
1776 else if ( dist < 128 )
1777 {
1778 /* We only round to an integer width if the corresponding */
1779 /* distortion is less than 1/4 pixel. Otherwise this */
1780 /* makes everything worse since the diagonals, which are */
1781 /* not hinted, appear a lot bolder or thinner than the */
1782 /* vertical stems. */
1783
1784 FT_Int delta;
1785
1786
1787 dist = ( dist + 22 ) & ~63;
1788 delta = dist - org_dist;
1789 if ( delta < 0 )
1790 delta = -delta;
1791
1792 if ( delta >= 16 )
1793 {
1794 dist = org_dist;
1795 if ( dist < 48 )
1796 dist = ( dist + 64 ) >> 1;
1797 }
1798 }
1799 else
1800 /* round otherwise to prevent color fringes in LCD mode */
1801 dist = ( dist + 32 ) & ~63;
1802 }
1803 }
1804 }
1805
1806 Done_Width:
1807 if ( sign )
1808 dist = -dist;
1809
1810 return dist;
1811 }
1812
1813
1814 /* align one stem edge relative to the previous stem edge */
1815
1816 static void
1817 af_latin2_align_linked_edge( AF_GlyphHints hints,
1818 AF_Dimension dim,
1819 AF_Edge base_edge,
1820 AF_Edge stem_edge )
1821 {
1822 FT_Pos dist = stem_edge->opos - base_edge->opos;
1823
1824 FT_Pos fitted_width = af_latin2_compute_stem_width( hints, dim, dist,
1825 base_edge->flags,
1826 stem_edge->flags );
1827
1828
1829 stem_edge->pos = base_edge->pos + fitted_width;
1830
1831 FT_TRACE5(( "LINK: edge %d (opos=%.2f) linked to (%.2f), "
1832 "dist was %.2f, now %.2f\n",
1833 stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0,
1834 stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 ));
1835 }
1836
1837
1838 static void
1839 af_latin2_align_serif_edge( AF_GlyphHints hints,
1840 AF_Edge base,
1841 AF_Edge serif )
1842 {
1843 FT_UNUSED( hints );
1844
1845 serif->pos = base->pos + ( serif->opos - base->opos );
1846 }
1847
1848
1849 /*************************************************************************/
1850 /*************************************************************************/
1851 /*************************************************************************/
1852 /**** ****/
1853 /**** E D G E H I N T I N G ****/
1854 /**** ****/
1855 /*************************************************************************/
1856 /*************************************************************************/
1857 /*************************************************************************/
1858
1859
1860 static void
1861 af_latin2_hint_edges( AF_GlyphHints hints,
1862 AF_Dimension dim )
1863 {
1864 AF_AxisHints axis = &hints->axis[dim];
1865 AF_Edge edges = axis->edges;
1866 AF_Edge edge_limit = edges + axis->num_edges;
1867 AF_Edge edge;
1868 AF_Edge anchor = NULL;
1869 FT_Int has_serifs = 0;
1870 FT_Pos anchor_drift = 0;
1871
1872
1873
1874 FT_TRACE5(( "==== hinting %s edges =====\n",
1875 dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ));
1876
1877 /* we begin by aligning all stems relative to the blue zone */
1878 /* if needed -- that's only for horizontal edges */
1879
1880 if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) )
1881 {
1882 for ( edge = edges; edge < edge_limit; edge++ )
1883 {
1884 AF_Width blue;
1885 AF_Edge edge1, edge2;
1886
1887
1888 if ( edge->flags & AF_EDGE_DONE )
1889 continue;
1890
1891 blue = edge->blue_edge;
1892 edge1 = NULL;
1893 edge2 = edge->link;
1894
1895 if ( blue )
1896 {
1897 edge1 = edge;
1898 }
1899 else if ( edge2 && edge2->blue_edge )
1900 {
1901 blue = edge2->blue_edge;
1902 edge1 = edge2;
1903 edge2 = edge;
1904 }
1905
1906 if ( !edge1 )
1907 continue;
1908
1909 FT_TRACE5(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), "
1910 "was (%.2f)\n",
1911 edge1-edges, edge1->opos / 64.0, blue->fit / 64.0,
1912 edge1->pos / 64.0 ));
1913
1914 edge1->pos = blue->fit;
1915 edge1->flags |= AF_EDGE_DONE;
1916
1917 if ( edge2 && !edge2->blue_edge )
1918 {
1919 af_latin2_align_linked_edge( hints, dim, edge1, edge2 );
1920 edge2->flags |= AF_EDGE_DONE;
1921 }
1922
1923 if ( !anchor )
1924 {
1925 anchor = edge;
1926
1927 anchor_drift = ( anchor->pos - anchor->opos );
1928 if ( edge2 )
1929 anchor_drift = ( anchor_drift +
1930 ( edge2->pos - edge2->opos ) ) >> 1;
1931 }
1932 }
1933 }
1934
1935 /* now we will align all stem edges, trying to maintain the */
1936 /* relative order of stems in the glyph */
1937 for ( edge = edges; edge < edge_limit; edge++ )
1938 {
1939 AF_Edge edge2;
1940
1941
1942 if ( edge->flags & AF_EDGE_DONE )
1943 continue;
1944
1945 /* skip all non-stem edges */
1946 edge2 = edge->link;
1947 if ( !edge2 )
1948 {
1949 has_serifs++;
1950 continue;
1951 }
1952
1953 /* now align the stem */
1954
1955 /* this should not happen, but it's better to be safe */
1956 if ( edge2->blue_edge )
1957 {
1958 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges ));
1959
1960 af_latin2_align_linked_edge( hints, dim, edge2, edge );
1961 edge->flags |= AF_EDGE_DONE;
1962 continue;
1963 }
1964
1965 if ( !anchor )
1966 {
1967 FT_Pos org_len, org_center, cur_len;
1968 FT_Pos cur_pos1, error1, error2, u_off, d_off;
1969
1970
1971 org_len = edge2->opos - edge->opos;
1972 cur_len = af_latin2_compute_stem_width( hints, dim, org_len,
1973 edge->flags,
1974 edge2->flags );
1975 if ( cur_len <= 64 )
1976 u_off = d_off = 32;
1977 else
1978 {
1979 u_off = 38;
1980 d_off = 26;
1981 }
1982
1983 if ( cur_len < 96 )
1984 {
1985 org_center = edge->opos + ( org_len >> 1 );
1986
1987 cur_pos1 = FT_PIX_ROUND( org_center );
1988
1989 error1 = org_center - ( cur_pos1 - u_off );
1990 if ( error1 < 0 )
1991 error1 = -error1;
1992
1993 error2 = org_center - ( cur_pos1 + d_off );
1994 if ( error2 < 0 )
1995 error2 = -error2;
1996
1997 if ( error1 < error2 )
1998 cur_pos1 -= u_off;
1999 else
2000 cur_pos1 += d_off;
2001
2002 edge->pos = cur_pos1 - cur_len / 2;
2003 edge2->pos = edge->pos + cur_len;
2004 }
2005 else
2006 edge->pos = FT_PIX_ROUND( edge->opos );
2007
2008 FT_TRACE5(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f)"
2009 " snapped to (%.2f) (%.2f)\n",
2010 edge-edges, edge->opos / 64.0,
2011 edge2-edges, edge2->opos / 64.0,
2012 edge->pos / 64.0, edge2->pos / 64.0 ));
2013 anchor = edge;
2014
2015 edge->flags |= AF_EDGE_DONE;
2016
2017 af_latin2_align_linked_edge( hints, dim, edge, edge2 );
2018
2019 edge2->flags |= AF_EDGE_DONE;
2020
2021 anchor_drift = ( ( anchor->pos - anchor->opos ) +
2022 ( edge2->pos - edge2->opos ) ) >> 1;
2023
2024 FT_TRACE5(( "DRIFT: %.2f\n", anchor_drift/64.0 ));
2025 }
2026 else
2027 {
2028 FT_Pos org_pos, org_len, org_center, cur_center, cur_len;
2029 FT_Pos org_left, org_right;
2030
2031
2032 org_pos = edge->opos + anchor_drift;
2033 org_len = edge2->opos - edge->opos;
2034 org_center = org_pos + ( org_len >> 1 );
2035
2036 cur_len = af_latin2_compute_stem_width( hints, dim, org_len,
2037 edge->flags,
2038 edge2->flags );
2039
2040 org_left = org_pos + ( ( org_len - cur_len ) >> 1 );
2041 org_right = org_pos + ( ( org_len + cur_len ) >> 1 );
2042
2043 FT_TRACE5(( "ALIGN: left=%.2f right=%.2f ",
2044 org_left / 64.0, org_right / 64.0 ));
2045 cur_center = org_center;
2046
2047 if ( edge2->flags & AF_EDGE_DONE )
2048 {
2049 FT_TRACE5(( "\n" ));
2050 edge->pos = edge2->pos - cur_len;
2051 }
2052 else
2053 {
2054 /* we want to compare several displacement, and choose
2055 * the one that increases fitness while minimizing
2056 * distortion as well
2057 */
2058 FT_Pos displacements[6], scores[6], org, fit, delta;
2059 FT_UInt count = 0;
2060
2061 /* note: don't even try to fit tiny stems */
2062 if ( cur_len < 32 )
2063 {
2064 FT_TRACE5(( "tiny stem\n" ));
2065 goto AlignStem;
2066 }
2067
2068 /* if the span is within a single pixel, don't touch it */
2069 if ( FT_PIX_FLOOR( org_left ) == FT_PIX_CEIL( org_right ) )
2070 {
2071 FT_TRACE5(( "single pixel stem\n" ));
2072 goto AlignStem;
2073 }
2074
2075 if ( cur_len <= 96 )
2076 {
2077 /* we want to avoid the absolute worst case which is
2078 * when the left and right edges of the span each represent
2079 * about 50% of the gray. we'd better want to change this
2080 * to 25/75%, since this is much more pleasant to the eye with
2081 * very acceptable distortion
2082 */
2083 FT_Pos frac_left = org_left & 63;
2084 FT_Pos frac_right = org_right & 63;
2085
2086 if ( frac_left >= 22 && frac_left <= 42 &&
2087 frac_right >= 22 && frac_right <= 42 )
2088 {
2089 org = frac_left;
2090 fit = ( org <= 32 ) ? 16 : 48;
2091 delta = FT_ABS( fit - org );
2092 displacements[count] = fit - org;
2093 scores[count++] = delta;
2094 FT_TRACE5(( "dispA=%.2f (%d) ", ( fit - org ) / 64.0, delta ));
2095
2096 org = frac_right;
2097 fit = ( org <= 32 ) ? 16 : 48;
2098 delta = FT_ABS( fit - org );
2099 displacements[count] = fit - org;
2100 scores[count++] = delta;
2101 FT_TRACE5(( "dispB=%.2f (%d) ", ( fit - org ) / 64.0, delta ));
2102 }
2103 }
2104
2105 /* snapping the left edge to the grid */
2106 org = org_left;
2107 fit = FT_PIX_ROUND( org );
2108 delta = FT_ABS( fit - org );
2109 displacements[count] = fit - org;
2110 scores[count++] = delta;
2111 FT_TRACE5(( "dispC=%.2f (%d) ", ( fit - org ) / 64.0, delta ));
2112
2113 /* snapping the right edge to the grid */
2114 org = org_right;
2115 fit = FT_PIX_ROUND( org );
2116 delta = FT_ABS( fit - org );
2117 displacements[count] = fit - org;
2118 scores[count++] = delta;
2119 FT_TRACE5(( "dispD=%.2f (%d) ", ( fit - org ) / 64.0, delta ));
2120
2121 /* now find the best displacement */
2122 {
2123 FT_Pos best_score = scores[0];
2124 FT_Pos best_disp = displacements[0];
2125 FT_UInt nn;
2126
2127 for ( nn = 1; nn < count; nn++ )
2128 {
2129 if ( scores[nn] < best_score )
2130 {
2131 best_score = scores[nn];
2132 best_disp = displacements[nn];
2133 }
2134 }
2135
2136 cur_center = org_center + best_disp;
2137 }
2138 FT_TRACE5(( "\n" ));
2139 }
2140
2141 AlignStem:
2142 edge->pos = cur_center - ( cur_len >> 1 );
2143 edge2->pos = edge->pos + cur_len;
2144
2145 FT_TRACE5(( "STEM1: %d (opos=%.2f) to %d (opos=%.2f)"
2146 " snapped to (%.2f) and (%.2f),"
2147 " org_len=%.2f cur_len=%.2f\n",
2148 edge-edges, edge->opos / 64.0,
2149 edge2-edges, edge2->opos / 64.0,
2150 edge->pos / 64.0, edge2->pos / 64.0,
2151 org_len / 64.0, cur_len / 64.0 ));
2152
2153 edge->flags |= AF_EDGE_DONE;
2154 edge2->flags |= AF_EDGE_DONE;
2155
2156 if ( edge > edges && edge->pos < edge[-1].pos )
2157 {
2158 FT_TRACE5(( "BOUND: %d (pos=%.2f) to (%.2f)\n",
2159 edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 ));
2160 edge->pos = edge[-1].pos;
2161 }
2162 }
2163 }
2164
2165 /* make sure that lowercase m's maintain their symmetry */
2166
2167 /* In general, lowercase m's have six vertical edges if they are sans */
2168 /* serif, or twelve if they are with serifs. This implementation is */
2169 /* based on that assumption, and seems to work very well with most */
2170 /* faces. However, if for a certain face this assumption is not */
2171 /* true, the m is just rendered like before. In addition, any stem */
2172 /* correction will only be applied to symmetrical glyphs (even if the */
2173 /* glyph is not an m), so the potential for unwanted distortion is */
2174 /* relatively low. */
2175
2176 /* We don't handle horizontal edges since we can't easily assure that */
2177 /* the third (lowest) stem aligns with the base line; it might end up */
2178 /* one pixel higher or lower. */
2179
2180#if 0
2181 {
2182 FT_Int n_edges = edge_limit - edges;
2183
2184
2185 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
2186 {
2187 AF_Edge edge1, edge2, edge3;
2188 FT_Pos dist1, dist2, span, delta;
2189
2190
2191 if ( n_edges == 6 )
2192 {
2193 edge1 = edges;
2194 edge2 = edges + 2;
2195 edge3 = edges + 4;
2196 }
2197 else
2198 {
2199 edge1 = edges + 1;
2200 edge2 = edges + 5;
2201 edge3 = edges + 9;
2202 }
2203
2204 dist1 = edge2->opos - edge1->opos;
2205 dist2 = edge3->opos - edge2->opos;
2206
2207 span = dist1 - dist2;
2208 if ( span < 0 )
2209 span = -span;
2210
2211 if ( span < 8 )
2212 {
2213 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
2214 edge3->pos -= delta;
2215 if ( edge3->link )
2216 edge3->link->pos -= delta;
2217
2218 /* move the serifs along with the stem */
2219 if ( n_edges == 12 )
2220 {
2221 ( edges + 8 )->pos -= delta;
2222 ( edges + 11 )->pos -= delta;
2223 }
2224
2225 edge3->flags |= AF_EDGE_DONE;
2226 if ( edge3->link )
2227 edge3->link->flags |= AF_EDGE_DONE;
2228 }
2229 }
2230 }
2231#endif
2232
2233 if ( has_serifs || !anchor )
2234 {
2235 /*
2236 * now hint the remaining edges (serifs and single) in order
2237 * to complete our processing
2238 */
2239 for ( edge = edges; edge < edge_limit; edge++ )
2240 {
2241 FT_Pos delta;
2242
2243
2244 if ( edge->flags & AF_EDGE_DONE )
2245 continue;
2246
2247 delta = 1000;
2248
2249 if ( edge->serif )
2250 {
2251 delta = edge->serif->opos - edge->opos;
2252 if ( delta < 0 )
2253 delta = -delta;
2254 }
2255
2256 if ( delta < 64 + 16 )
2257 {
2258 af_latin2_align_serif_edge( hints, edge->serif, edge );
2259 FT_TRACE5(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f)"
2260 " aligned to (%.2f)\n",
2261 edge-edges, edge->opos / 64.0,
2262 edge->serif - edges, edge->serif->opos / 64.0,
2263 edge->pos / 64.0 ));
2264 }
2265 else if ( !anchor )
2266 {
2267 FT_TRACE5(( "SERIF_ANCHOR: edge %d (opos=%.2f)"
2268 " snapped to (%.2f)\n",
2269 edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
2270 edge->pos = FT_PIX_ROUND( edge->opos );
2271 anchor = edge;
2272 }
2273 else
2274 {
2275 AF_Edge before, after;
2276
2277
2278 for ( before = edge - 1; before >= edges; before-- )
2279 if ( before->flags & AF_EDGE_DONE )
2280 break;
2281
2282 for ( after = edge + 1; after < edge_limit; after++ )
2283 if ( after->flags & AF_EDGE_DONE )
2284 break;
2285
2286 if ( before >= edges && before < edge &&
2287 after < edge_limit && after > edge )
2288 {
2289 if ( after->opos == before->opos )
2290 edge->pos = before->pos;
2291 else
2292 edge->pos = before->pos +
2293 FT_MulDiv( edge->opos - before->opos,
2294 after->pos - before->pos,
2295 after->opos - before->opos );
2296 FT_TRACE5(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f)"
2297 " from %d (opos=%.2f)\n",
2298 edge-edges, edge->opos / 64.0, edge->pos / 64.0,
2299 before - edges, before->opos / 64.0 ));
2300 }
2301 else
2302 {
2303 edge->pos = anchor->pos +
2304 ( ( edge->opos - anchor->opos + 16 ) & ~31 );
2305
2306 FT_TRACE5(( "SERIF_LINK2: edge %d (opos=%.2f)"
2307 " snapped to (%.2f)\n",
2308 edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
2309 }
2310 }
2311
2312 edge->flags |= AF_EDGE_DONE;
2313
2314 if ( edge > edges && edge->pos < edge[-1].pos )
2315 edge->pos = edge[-1].pos;
2316
2317 if ( edge + 1 < edge_limit &&
2318 edge[1].flags & AF_EDGE_DONE &&
2319 edge->pos > edge[1].pos )
2320 edge->pos = edge[1].pos;
2321 }
2322 }
2323 }
2324
2325
2326 static FT_Error
2327 af_latin2_hints_apply( FT_UInt glyph_index,
2328 AF_GlyphHints hints,
2329 FT_Outline* outline,
2330 AF_LatinMetrics metrics )
2331 {
2332 FT_Error error;
2333 int dim;
2334
2335 FT_UNUSED( glyph_index );
2336
2337
2338 error = af_glyph_hints_reload( hints, outline );
2339 if ( error )
2340 goto Exit;
2341
2342 /* analyze glyph outline */
2343 if ( AF_HINTS_DO_HORIZONTAL( hints ) )
2344 {
2345 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_HORZ );
2346 if ( error )
2347 goto Exit;
2348 }
2349
2350 if ( AF_HINTS_DO_VERTICAL( hints ) )
2351 {
2352 error = af_latin2_hints_detect_features( hints, AF_DIMENSION_VERT );
2353 if ( error )
2354 goto Exit;
2355
2356 af_latin2_hints_compute_blue_edges( hints, metrics );
2357 }
2358
2359 /* grid-fit the outline */
2360 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
2361 {
2362#ifdef AF_CONFIG_OPTION_USE_WARPER
2363 if ( dim == AF_DIMENSION_HORZ &&
2364 metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL &&
2365 AF_HINTS_DO_WARP( hints ) )
2366 {
2367 AF_WarperRec warper;
2368 FT_Fixed scale;
2369 FT_Pos delta;
2370
2371
2372 af_warper_compute( &warper, hints, dim, &scale, &delta );
2373 af_glyph_hints_scale_dim( hints, dim, scale, delta );
2374 continue;
2375 }
2376#endif /* AF_CONFIG_OPTION_USE_WARPER */
2377
2378 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
2379 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
2380 {
2381 af_latin2_hint_edges( hints, (AF_Dimension)dim );
2382 af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim );
2383 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
2384 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
2385 }
2386 }
2387 af_glyph_hints_save( hints, outline );
2388
2389 Exit:
2390 return error;
2391 }
2392
2393
2394 /*************************************************************************/
2395 /*************************************************************************/
2396 /***** *****/
2397 /***** L A T I N S C R I P T C L A S S *****/
2398 /***** *****/
2399 /*************************************************************************/
2400 /*************************************************************************/
2401
2402
2403 AF_DEFINE_WRITING_SYSTEM_CLASS(
2404 af_latin2_writing_system_class,
2405
2406 AF_WRITING_SYSTEM_LATIN2,
2407
2408 sizeof ( AF_LatinMetricsRec ),
2409
2410 (AF_WritingSystem_InitMetricsFunc) af_latin2_metrics_init, /* style_metrics_init */
2411 (AF_WritingSystem_ScaleMetricsFunc)af_latin2_metrics_scale, /* style_metrics_scale */
2412 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
2413 (AF_WritingSystem_GetStdWidthsFunc)af_latin2_get_standard_widths, /* style_metrics_getstdw */
2414
2415 (AF_WritingSystem_InitHintsFunc) af_latin2_hints_init, /* style_hints_init */
2416 (AF_WritingSystem_ApplyHintsFunc) af_latin2_hints_apply /* style_hints_apply */
2417 )
2418
2419#else /* !FT_OPTION_AUTOFIT2 */
2420
2421 /* ANSI C doesn't like empty source files */
2422 typedef int _af_latin2_dummy;
2423
2424#endif /* !FT_OPTION_AUTOFIT2 */
2425
2426
2427/* END */
2428