1/****************************************************************************
2 *
3 * afcjk.c
4 *
5 * Auto-fitter hinting routines for CJK writing system (body).
6 *
7 * Copyright (C) 2006-2023 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 * The algorithm is based on akito's autohint patch, archived at
20 *
21 * https://web.archive.org/web/20051219160454/http://www.kde.gr.jp:80/~akito/patch/freetype2/2.1.7/
22 *
23 */
24
25#include <freetype/ftadvanc.h>
26#include <freetype/internal/ftdebug.h>
27
28#include "afglobal.h"
29#include "aflatin.h"
30#include "afcjk.h"
31
32
33#ifdef AF_CONFIG_OPTION_CJK
34
35#undef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT
36
37#include "aferrors.h"
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 afcjk
48
49
50 /*************************************************************************/
51 /*************************************************************************/
52 /***** *****/
53 /***** C J K G L O B A L M E T R I C S *****/
54 /***** *****/
55 /*************************************************************************/
56 /*************************************************************************/
57
58
59 /* Basically the Latin version with AF_CJKMetrics */
60 /* to replace AF_LatinMetrics. */
61
62 FT_LOCAL_DEF( void )
63 af_cjk_metrics_init_widths( AF_CJKMetrics metrics,
64 FT_Face face )
65 {
66 /* scan the array of segments in each direction */
67 AF_GlyphHintsRec hints[1];
68
69
70 FT_TRACE5(( "\n" ));
71 FT_TRACE5(( "cjk standard widths computation (style `%s')\n",
72 af_style_names[metrics->root.style_class->style] ));
73 FT_TRACE5(( "===================================================\n" ));
74 FT_TRACE5(( "\n" ));
75
76 af_glyph_hints_init( hints, face->memory );
77
78 metrics->axis[AF_DIMENSION_HORZ].width_count = 0;
79 metrics->axis[AF_DIMENSION_VERT].width_count = 0;
80
81 {
82 FT_Error error;
83 FT_ULong glyph_index;
84 int dim;
85 AF_CJKMetricsRec dummy[1];
86 AF_Scaler scaler = &dummy->root.scaler;
87
88 AF_StyleClass style_class = metrics->root.style_class;
89 AF_ScriptClass script_class = af_script_classes[style_class->script];
90
91 /* If HarfBuzz is not available, we need a pointer to a single */
92 /* unsigned long value. */
93#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
94 void* shaper_buf;
95#else
96 FT_ULong shaper_buf_;
97 void* shaper_buf = &shaper_buf_;
98#endif
99
100 const char* p;
101
102#ifdef FT_DEBUG_LEVEL_TRACE
103 FT_ULong ch = 0;
104#endif
105
106 p = script_class->standard_charstring;
107
108#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
109 shaper_buf = af_shaper_buf_create( face );
110#endif
111
112 /* We check a list of standard characters. The first match wins. */
113
114 glyph_index = 0;
115 while ( *p )
116 {
117 unsigned int num_idx;
118
119#ifdef FT_DEBUG_LEVEL_TRACE
120 const char* p_old;
121#endif
122
123
124 while ( *p == ' ' )
125 p++;
126
127#ifdef FT_DEBUG_LEVEL_TRACE
128 p_old = p;
129 GET_UTF8_CHAR( ch, p_old );
130#endif
131
132 /* reject input that maps to more than a single glyph */
133 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
134 if ( num_idx > 1 )
135 continue;
136
137 /* otherwise exit loop if we have a result */
138 glyph_index = af_shaper_get_elem( &metrics->root,
139 shaper_buf,
140 0,
141 NULL,
142 NULL );
143 if ( glyph_index )
144 break;
145 }
146
147 af_shaper_buf_destroy( face, shaper_buf );
148
149 if ( !glyph_index )
150 goto Exit;
151
152 if ( !glyph_index )
153 goto Exit;
154
155 FT_TRACE5(( "standard character: U+%04lX (glyph index %ld)\n",
156 ch, glyph_index ));
157
158 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
159 if ( error || face->glyph->outline.n_points <= 0 )
160 goto Exit;
161
162 FT_ZERO( dummy );
163
164 dummy->units_per_em = metrics->units_per_em;
165
166 scaler->x_scale = 0x10000L;
167 scaler->y_scale = 0x10000L;
168 scaler->x_delta = 0;
169 scaler->y_delta = 0;
170
171 scaler->face = face;
172 scaler->render_mode = FT_RENDER_MODE_NORMAL;
173 scaler->flags = 0;
174
175 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy );
176
177 error = af_glyph_hints_reload( hints, &face->glyph->outline );
178 if ( error )
179 goto Exit;
180
181 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
182 {
183 AF_CJKAxis axis = &metrics->axis[dim];
184 AF_AxisHints axhints = &hints->axis[dim];
185 AF_Segment seg, limit, link;
186 FT_UInt num_widths = 0;
187
188
189 error = af_latin_hints_compute_segments( hints,
190 (AF_Dimension)dim );
191 if ( error )
192 goto Exit;
193
194 /*
195 * We assume that the glyphs selected for the stem width
196 * computation are `featureless' enough so that the linking
197 * algorithm works fine without adjustments of its scoring
198 * function.
199 */
200 af_latin_hints_link_segments( hints,
201 0,
202 NULL,
203 (AF_Dimension)dim );
204
205 seg = axhints->segments;
206 limit = seg + axhints->num_segments;
207
208 for ( ; seg < limit; seg++ )
209 {
210 link = seg->link;
211
212 /* we only consider stem segments there! */
213 if ( link && link->link == seg && link > seg )
214 {
215 FT_Pos dist;
216
217
218 dist = seg->pos - link->pos;
219 if ( dist < 0 )
220 dist = -dist;
221
222 if ( num_widths < AF_CJK_MAX_WIDTHS )
223 axis->widths[num_widths++].org = dist;
224 }
225 }
226
227 /* this also replaces multiple almost identical stem widths */
228 /* with a single one (the value 100 is heuristic) */
229 af_sort_and_quantize_widths( &num_widths, axis->widths,
230 dummy->units_per_em / 100 );
231 axis->width_count = num_widths;
232 }
233
234 Exit:
235 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
236 {
237 AF_CJKAxis axis = &metrics->axis[dim];
238 FT_Pos stdw;
239
240
241 stdw = ( axis->width_count > 0 ) ? axis->widths[0].org
242 : AF_LATIN_CONSTANT( metrics, 50 );
243
244 /* let's try 20% of the smallest width */
245 axis->edge_distance_threshold = stdw / 5;
246 axis->standard_width = stdw;
247 axis->extra_light = 0;
248
249#ifdef FT_DEBUG_LEVEL_TRACE
250 {
251 FT_UInt i;
252
253
254 FT_TRACE5(( "%s widths:\n",
255 dim == AF_DIMENSION_VERT ? "horizontal"
256 : "vertical" ));
257
258 FT_TRACE5(( " %ld (standard)", axis->standard_width ));
259 for ( i = 1; i < axis->width_count; i++ )
260 FT_TRACE5(( " %ld", axis->widths[i].org ));
261
262 FT_TRACE5(( "\n" ));
263 }
264#endif
265 }
266 }
267
268 FT_TRACE5(( "\n" ));
269
270 af_glyph_hints_done( hints );
271 }
272
273
274 /* Find all blue zones. */
275
276 static void
277 af_cjk_metrics_init_blues( AF_CJKMetrics metrics,
278 FT_Face face )
279 {
280 FT_Pos fills[AF_BLUE_STRING_MAX_LEN];
281 FT_Pos flats[AF_BLUE_STRING_MAX_LEN];
282
283 FT_UInt num_fills;
284 FT_UInt num_flats;
285
286 FT_Bool fill;
287
288 AF_CJKBlue blue;
289 FT_Error error;
290 AF_CJKAxis axis;
291 FT_Outline outline;
292
293 AF_StyleClass sc = metrics->root.style_class;
294
295 AF_Blue_Stringset bss = sc->blue_stringset;
296 const AF_Blue_StringRec* bs = &af_blue_stringsets[bss];
297
298 /* If HarfBuzz is not available, we need a pointer to a single */
299 /* unsigned long value. */
300#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
301 void* shaper_buf;
302#else
303 FT_ULong shaper_buf_;
304 void* shaper_buf = &shaper_buf_;
305#endif
306
307
308 /* we walk over the blue character strings as specified in the */
309 /* style's entry in the `af_blue_stringset' array, computing its */
310 /* extremum points (depending on the string properties) */
311
312 FT_TRACE5(( "cjk blue zones computation\n" ));
313 FT_TRACE5(( "==========================\n" ));
314 FT_TRACE5(( "\n" ));
315
316#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
317 shaper_buf = af_shaper_buf_create( face );
318#endif
319
320 for ( ; bs->string != AF_BLUE_STRING_MAX; bs++ )
321 {
322 const char* p = &af_blue_strings[bs->string];
323 FT_Pos* blue_ref;
324 FT_Pos* blue_shoot;
325
326
327 if ( AF_CJK_IS_HORIZ_BLUE( bs ) )
328 axis = &metrics->axis[AF_DIMENSION_HORZ];
329 else
330 axis = &metrics->axis[AF_DIMENSION_VERT];
331
332#ifdef FT_DEBUG_LEVEL_TRACE
333 {
334 FT_String* cjk_blue_name[4] =
335 {
336 (FT_String*)"bottom", /* -- , -- */
337 (FT_String*)"top", /* -- , TOP */
338 (FT_String*)"left", /* HORIZ, -- */
339 (FT_String*)"right" /* HORIZ, TOP */
340 };
341
342
343 FT_TRACE5(( "blue zone %d (%s):\n",
344 axis->blue_count,
345 cjk_blue_name[AF_CJK_IS_HORIZ_BLUE( bs ) |
346 AF_CJK_IS_TOP_BLUE( bs ) ] ));
347 }
348#endif /* FT_DEBUG_LEVEL_TRACE */
349
350 num_fills = 0;
351 num_flats = 0;
352
353 fill = 1; /* start with characters that define fill values */
354 FT_TRACE5(( " [overshoot values]\n" ));
355
356 while ( *p )
357 {
358 FT_ULong glyph_index;
359 FT_Pos best_pos; /* same as points.y or points.x, resp. */
360 FT_Int best_point;
361 FT_Vector* points;
362
363 unsigned int num_idx;
364
365#ifdef FT_DEBUG_LEVEL_TRACE
366 const char* p_old;
367 FT_ULong ch;
368#endif
369
370
371 while ( *p == ' ' )
372 p++;
373
374#ifdef FT_DEBUG_LEVEL_TRACE
375 p_old = p;
376 GET_UTF8_CHAR( ch, p_old );
377#endif
378
379 /* switch to characters that define flat values */
380 if ( *p == '|' )
381 {
382 fill = 0;
383 FT_TRACE5(( " [reference values]\n" ));
384 p++;
385 continue;
386 }
387
388 /* reject input that maps to more than a single glyph */
389 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
390 if ( num_idx > 1 )
391 continue;
392
393 /* load the character in the face -- skip unknown or empty ones */
394 glyph_index = af_shaper_get_elem( &metrics->root,
395 shaper_buf,
396 0,
397 NULL,
398 NULL );
399 if ( glyph_index == 0 )
400 {
401 FT_TRACE5(( " U+%04lX unavailable\n", ch ));
402 continue;
403 }
404
405 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
406 outline = face->glyph->outline;
407 if ( error || outline.n_points <= 2 )
408 {
409 FT_TRACE5(( " U+%04lX contains no (usable) outlines\n", ch ));
410 continue;
411 }
412
413 /* now compute min or max point indices and coordinates */
414 points = outline.points;
415 best_point = -1;
416 best_pos = 0; /* make compiler happy */
417
418 {
419 FT_Int nn;
420 FT_Int pp, first, last;
421
422
423 last = -1;
424 for ( nn = 0; nn < outline.n_contours; nn++ )
425 {
426 first = last + 1;
427 last = outline.contours[nn];
428
429 /* Avoid single-point contours since they are never rasterized. */
430 /* In some fonts, they correspond to mark attachment points */
431 /* which are way outside of the glyph's real outline. */
432 if ( last <= first )
433 continue;
434
435 if ( AF_CJK_IS_HORIZ_BLUE( bs ) )
436 {
437 if ( AF_CJK_IS_RIGHT_BLUE( bs ) )
438 {
439 for ( pp = first; pp <= last; pp++ )
440 if ( best_point < 0 || points[pp].x > best_pos )
441 {
442 best_point = pp;
443 best_pos = points[pp].x;
444 }
445 }
446 else
447 {
448 for ( pp = first; pp <= last; pp++ )
449 if ( best_point < 0 || points[pp].x < best_pos )
450 {
451 best_point = pp;
452 best_pos = points[pp].x;
453 }
454 }
455 }
456 else
457 {
458 if ( AF_CJK_IS_TOP_BLUE( bs ) )
459 {
460 for ( pp = first; pp <= last; pp++ )
461 if ( best_point < 0 || points[pp].y > best_pos )
462 {
463 best_point = pp;
464 best_pos = points[pp].y;
465 }
466 }
467 else
468 {
469 for ( pp = first; pp <= last; pp++ )
470 if ( best_point < 0 || points[pp].y < best_pos )
471 {
472 best_point = pp;
473 best_pos = points[pp].y;
474 }
475 }
476 }
477 }
478
479 FT_TRACE5(( " U+%04lX: best_pos = %5ld\n", ch, best_pos ));
480 }
481
482 if ( fill )
483 fills[num_fills++] = best_pos;
484 else
485 flats[num_flats++] = best_pos;
486
487 } /* end while loop */
488
489 if ( num_flats == 0 && num_fills == 0 )
490 {
491 /*
492 * we couldn't find a single glyph to compute this blue zone,
493 * we will simply ignore it then
494 */
495 FT_TRACE5(( " empty\n" ));
496 continue;
497 }
498
499 /* we have computed the contents of the `fill' and `flats' tables, */
500 /* now determine the reference and overshoot position of the blue -- */
501 /* we simply take the median value after a simple sort */
502 af_sort_pos( num_fills, fills );
503 af_sort_pos( num_flats, flats );
504
505 blue = &axis->blues[axis->blue_count];
506 blue_ref = &blue->ref.org;
507 blue_shoot = &blue->shoot.org;
508
509 axis->blue_count++;
510
511 if ( num_flats == 0 )
512 {
513 *blue_ref =
514 *blue_shoot = fills[num_fills / 2];
515 }
516 else if ( num_fills == 0 )
517 {
518 *blue_ref =
519 *blue_shoot = flats[num_flats / 2];
520 }
521 else
522 {
523 *blue_ref = fills[num_fills / 2];
524 *blue_shoot = flats[num_flats / 2];
525 }
526
527 /* make sure blue_ref >= blue_shoot for top/right or */
528 /* vice versa for bottom/left */
529 if ( *blue_shoot != *blue_ref )
530 {
531 FT_Pos ref = *blue_ref;
532 FT_Pos shoot = *blue_shoot;
533 FT_Bool under_ref = FT_BOOL( shoot < ref );
534
535
536 /* AF_CJK_IS_TOP_BLUE covers `right' and `top' */
537 if ( AF_CJK_IS_TOP_BLUE( bs ) ^ under_ref )
538 {
539 *blue_ref =
540 *blue_shoot = ( shoot + ref ) / 2;
541
542 FT_TRACE5(( " [reference smaller than overshoot,"
543 " taking mean value]\n" ));
544 }
545 }
546
547 blue->flags = 0;
548 if ( AF_CJK_IS_TOP_BLUE( bs ) )
549 blue->flags |= AF_CJK_BLUE_TOP;
550
551 FT_TRACE5(( " -> reference = %ld\n", *blue_ref ));
552 FT_TRACE5(( " overshoot = %ld\n", *blue_shoot ));
553
554 } /* end for loop */
555
556 af_shaper_buf_destroy( face, shaper_buf );
557
558 FT_TRACE5(( "\n" ));
559
560 return;
561 }
562
563
564 /* Basically the Latin version with type AF_CJKMetrics for metrics. */
565
566 FT_LOCAL_DEF( void )
567 af_cjk_metrics_check_digits( AF_CJKMetrics metrics,
568 FT_Face face )
569 {
570 FT_Bool started = 0, same_width = 1;
571 FT_Long advance = 0, old_advance = 0;
572
573 /* If HarfBuzz is not available, we need a pointer to a single */
574 /* unsigned long value. */
575#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
576 void* shaper_buf;
577#else
578 FT_ULong shaper_buf_;
579 void* shaper_buf = &shaper_buf_;
580#endif
581
582 /* in all supported charmaps, digits have character codes 0x30-0x39 */
583 const char digits[] = "0 1 2 3 4 5 6 7 8 9";
584 const char* p;
585
586
587 p = digits;
588
589#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
590 shaper_buf = af_shaper_buf_create( face );
591#endif
592
593 while ( *p )
594 {
595 FT_ULong glyph_index;
596 unsigned int num_idx;
597
598
599 /* reject input that maps to more than a single glyph */
600 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
601 if ( num_idx > 1 )
602 continue;
603
604 glyph_index = af_shaper_get_elem( &metrics->root,
605 shaper_buf,
606 0,
607 &advance,
608 NULL );
609 if ( !glyph_index )
610 continue;
611
612 if ( started )
613 {
614 if ( advance != old_advance )
615 {
616 same_width = 0;
617 break;
618 }
619 }
620 else
621 {
622 old_advance = advance;
623 started = 1;
624 }
625 }
626
627 af_shaper_buf_destroy( face, shaper_buf );
628
629 metrics->root.digits_have_same_width = same_width;
630 }
631
632
633 /* Initialize global metrics. */
634
635 FT_LOCAL_DEF( FT_Error )
636 af_cjk_metrics_init( AF_StyleMetrics metrics_, /* AF_CJKMetrics */
637 FT_Face face )
638 {
639 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
640 FT_CharMap oldmap = face->charmap;
641
642
643 metrics->units_per_em = face->units_per_EM;
644
645 if ( !FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
646 {
647 af_cjk_metrics_init_widths( metrics, face );
648 af_cjk_metrics_init_blues( metrics, face );
649 af_cjk_metrics_check_digits( metrics, face );
650 }
651
652 face->charmap = oldmap;
653 return FT_Err_Ok;
654 }
655
656
657 /* Adjust scaling value, then scale and shift widths */
658 /* and blue zones (if applicable) for given dimension. */
659
660 static void
661 af_cjk_metrics_scale_dim( AF_CJKMetrics metrics,
662 AF_Scaler scaler,
663 AF_Dimension dim )
664 {
665 FT_Fixed scale;
666 FT_Pos delta;
667 AF_CJKAxis axis;
668 FT_UInt nn;
669
670
671 if ( dim == AF_DIMENSION_HORZ )
672 {
673 scale = scaler->x_scale;
674 delta = scaler->x_delta;
675 }
676 else
677 {
678 scale = scaler->y_scale;
679 delta = scaler->y_delta;
680 }
681
682 axis = &metrics->axis[dim];
683
684 if ( axis->org_scale == scale && axis->org_delta == delta )
685 return;
686
687 axis->org_scale = scale;
688 axis->org_delta = delta;
689
690 axis->scale = scale;
691 axis->delta = delta;
692
693 /* scale the blue zones */
694 for ( nn = 0; nn < axis->blue_count; nn++ )
695 {
696 AF_CJKBlue blue = &axis->blues[nn];
697 FT_Pos dist;
698
699
700 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
701 blue->ref.fit = blue->ref.cur;
702 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
703 blue->shoot.fit = blue->shoot.cur;
704 blue->flags &= ~AF_CJK_BLUE_ACTIVE;
705
706 /* a blue zone is only active if it is less than 3/4 pixels tall */
707 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
708 if ( dist <= 48 && dist >= -48 )
709 {
710 FT_Pos delta1, delta2;
711
712
713 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
714
715 /* shoot is under shoot for cjk */
716 delta1 = FT_DivFix( blue->ref.fit, scale ) - blue->shoot.org;
717 delta2 = delta1;
718 if ( delta1 < 0 )
719 delta2 = -delta2;
720
721 delta2 = FT_MulFix( delta2, scale );
722
723 FT_TRACE5(( "delta: %ld", delta1 ));
724 if ( delta2 < 32 )
725 delta2 = 0;
726#if 0
727 else if ( delta2 < 64 )
728 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
729#endif
730 else
731 delta2 = FT_PIX_ROUND( delta2 );
732 FT_TRACE5(( "/%ld\n", delta2 ));
733
734 if ( delta1 < 0 )
735 delta2 = -delta2;
736
737 blue->shoot.fit = blue->ref.fit - delta2;
738
739 FT_TRACE5(( ">> active cjk blue zone %c%d[%ld/%ld]:\n",
740 ( dim == AF_DIMENSION_HORZ ) ? 'H' : 'V',
741 nn, blue->ref.org, blue->shoot.org ));
742 FT_TRACE5(( " ref: cur=%.2f fit=%.2f\n",
743 (double)blue->ref.cur / 64,
744 (double)blue->ref.fit / 64 ));
745 FT_TRACE5(( " shoot: cur=%.2f fit=%.2f\n",
746 (double)blue->shoot.cur / 64,
747 (double)blue->shoot.fit / 64 ));
748
749 blue->flags |= AF_CJK_BLUE_ACTIVE;
750 }
751 }
752 }
753
754
755 /* Scale global values in both directions. */
756
757 FT_LOCAL_DEF( void )
758 af_cjk_metrics_scale( AF_StyleMetrics metrics_, /* AF_CJKMetrics */
759 AF_Scaler scaler )
760 {
761 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
762
763
764 /* we copy the whole structure since the x and y scaling values */
765 /* are not modified, contrary to e.g. the `latin' auto-hinter */
766 metrics->root.scaler = *scaler;
767
768 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
769 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
770 }
771
772
773 /* Extract standard_width from writing system/script specific */
774 /* metrics class. */
775
776 FT_CALLBACK_DEF( void )
777 af_cjk_get_standard_widths( AF_StyleMetrics metrics_, /* AF_CJKMetrics */
778 FT_Pos* stdHW,
779 FT_Pos* stdVW )
780 {
781 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
782
783
784 if ( stdHW )
785 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width;
786
787 if ( stdVW )
788 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width;
789 }
790
791
792 /*************************************************************************/
793 /*************************************************************************/
794 /***** *****/
795 /***** C J K G L Y P H A N A L Y S I S *****/
796 /***** *****/
797 /*************************************************************************/
798 /*************************************************************************/
799
800
801 /* Walk over all contours and compute its segments. */
802
803 static FT_Error
804 af_cjk_hints_compute_segments( AF_GlyphHints hints,
805 AF_Dimension dim )
806 {
807 AF_AxisHints axis = &hints->axis[dim];
808 AF_Segment segments = axis->segments;
809 AF_Segment segment_limit = FT_OFFSET( segments, axis->num_segments );
810 FT_Error error;
811 AF_Segment seg;
812
813
814 error = af_latin_hints_compute_segments( hints, dim );
815 if ( error )
816 return error;
817
818 /* a segment is round if it doesn't have successive */
819 /* on-curve points. */
820 for ( seg = segments; seg < segment_limit; seg++ )
821 {
822 AF_Point pt = seg->first;
823 AF_Point last = seg->last;
824 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL;
825 FT_UInt f1;
826
827
828 seg->flags &= ~AF_EDGE_ROUND;
829
830 for ( ; pt != last; f0 = f1 )
831 {
832 pt = pt->next;
833 f1 = pt->flags & AF_FLAG_CONTROL;
834
835 if ( !f0 && !f1 )
836 break;
837
838 if ( pt == last )
839 seg->flags |= AF_EDGE_ROUND;
840 }
841 }
842
843 return FT_Err_Ok;
844 }
845
846
847 static void
848 af_cjk_hints_link_segments( AF_GlyphHints hints,
849 AF_Dimension dim )
850 {
851 AF_AxisHints axis = &hints->axis[dim];
852 AF_Segment segments = axis->segments;
853 AF_Segment segment_limit = FT_OFFSET( segments, axis->num_segments );
854 AF_Direction major_dir = axis->major_dir;
855 AF_Segment seg1, seg2;
856 FT_Pos len_threshold;
857 FT_Pos dist_threshold;
858
859
860 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
861
862 dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
863 : hints->y_scale;
864 dist_threshold = FT_DivFix( 64 * 3, dist_threshold );
865
866 /* now compare each segment to the others */
867 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
868 {
869 if ( seg1->dir != major_dir )
870 continue;
871
872 for ( seg2 = segments; seg2 < segment_limit; seg2++ )
873 if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 )
874 {
875 FT_Pos dist = seg2->pos - seg1->pos;
876
877
878 if ( dist < 0 )
879 continue;
880
881 {
882 FT_Pos min = seg1->min_coord;
883 FT_Pos max = seg1->max_coord;
884 FT_Pos len;
885
886
887 if ( min < seg2->min_coord )
888 min = seg2->min_coord;
889
890 if ( max > seg2->max_coord )
891 max = seg2->max_coord;
892
893 len = max - min;
894 if ( len >= len_threshold )
895 {
896 if ( dist * 8 < seg1->score * 9 &&
897 ( dist * 8 < seg1->score * 7 || seg1->len < len ) )
898 {
899 seg1->score = dist;
900 seg1->len = len;
901 seg1->link = seg2;
902 }
903
904 if ( dist * 8 < seg2->score * 9 &&
905 ( dist * 8 < seg2->score * 7 || seg2->len < len ) )
906 {
907 seg2->score = dist;
908 seg2->len = len;
909 seg2->link = seg1;
910 }
911 }
912 }
913 }
914 }
915
916 /*
917 * now compute the `serif' segments
918 *
919 * In Hanzi, some strokes are wider on one or both of the ends.
920 * We either identify the stems on the ends as serifs or remove
921 * the linkage, depending on the length of the stems.
922 *
923 */
924
925 {
926 AF_Segment link1, link2;
927
928
929 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
930 {
931 link1 = seg1->link;
932 if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos )
933 continue;
934
935 if ( seg1->score >= dist_threshold )
936 continue;
937
938 for ( seg2 = segments; seg2 < segment_limit; seg2++ )
939 {
940 if ( seg2->pos > seg1->pos || seg1 == seg2 )
941 continue;
942
943 link2 = seg2->link;
944 if ( !link2 || link2->link != seg2 || link2->pos < link1->pos )
945 continue;
946
947 if ( seg1->pos == seg2->pos && link1->pos == link2->pos )
948 continue;
949
950 if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score )
951 continue;
952
953 /* seg2 < seg1 < link1 < link2 */
954
955 if ( seg1->len >= seg2->len * 3 )
956 {
957 AF_Segment seg;
958
959
960 for ( seg = segments; seg < segment_limit; seg++ )
961 {
962 AF_Segment link = seg->link;
963
964
965 if ( link == seg2 )
966 {
967 seg->link = NULL;
968 seg->serif = link1;
969 }
970 else if ( link == link2 )
971 {
972 seg->link = NULL;
973 seg->serif = seg1;
974 }
975 }
976 }
977 else
978 {
979 seg1->link = link1->link = NULL;
980
981 break;
982 }
983 }
984 }
985 }
986
987 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
988 {
989 seg2 = seg1->link;
990
991 if ( seg2 )
992 {
993 if ( seg2->link != seg1 )
994 {
995 seg1->link = NULL;
996
997 if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 )
998 seg1->serif = seg2->link;
999 }
1000 }
1001 }
1002 }
1003
1004
1005 static FT_Error
1006 af_cjk_hints_compute_edges( AF_GlyphHints hints,
1007 AF_Dimension dim )
1008 {
1009 AF_AxisHints axis = &hints->axis[dim];
1010 FT_Error error = FT_Err_Ok;
1011 FT_Memory memory = hints->memory;
1012 AF_CJKAxis laxis = &((AF_CJKMetrics)hints->metrics)->axis[dim];
1013
1014 AF_Segment segments = axis->segments;
1015 AF_Segment segment_limit = FT_OFFSET( segments, axis->num_segments );
1016 AF_Segment seg;
1017
1018 FT_Fixed scale;
1019 FT_Pos edge_distance_threshold;
1020
1021
1022 axis->num_edges = 0;
1023
1024 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
1025 : hints->y_scale;
1026
1027 /**********************************************************************
1028 *
1029 * We begin by generating a sorted table of edges for the current
1030 * direction. To do so, we simply scan each segment and try to find
1031 * an edge in our table that corresponds to its position.
1032 *
1033 * If no edge is found, we create and insert a new edge in the
1034 * sorted table. Otherwise, we simply add the segment to the edge's
1035 * list which is then processed in the second step to compute the
1036 * edge's properties.
1037 *
1038 * Note that the edges table is sorted along the segment/edge
1039 * position.
1040 *
1041 */
1042
1043 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
1044 scale );
1045 if ( edge_distance_threshold > 64 / 4 )
1046 edge_distance_threshold = FT_DivFix( 64 / 4, scale );
1047 else
1048 edge_distance_threshold = laxis->edge_distance_threshold;
1049
1050 for ( seg = segments; seg < segment_limit; seg++ )
1051 {
1052 AF_Edge found = NULL;
1053 FT_Pos best = 0xFFFFU;
1054 FT_UInt ee;
1055
1056
1057 /* look for an edge corresponding to the segment */
1058 for ( ee = 0; ee < axis->num_edges; ee++ )
1059 {
1060 AF_Edge edge = axis->edges + ee;
1061 FT_Pos dist;
1062
1063
1064 if ( edge->dir != seg->dir )
1065 continue;
1066
1067 dist = seg->pos - edge->fpos;
1068 if ( dist < 0 )
1069 dist = -dist;
1070
1071 if ( dist < edge_distance_threshold && dist < best )
1072 {
1073 AF_Segment link = seg->link;
1074
1075
1076 /* check whether all linked segments of the candidate edge */
1077 /* can make a single edge. */
1078 if ( link )
1079 {
1080 AF_Segment seg1 = edge->first;
1081 FT_Pos dist2 = 0;
1082
1083
1084 do
1085 {
1086 AF_Segment link1 = seg1->link;
1087
1088
1089 if ( link1 )
1090 {
1091 dist2 = AF_SEGMENT_DIST( link, link1 );
1092 if ( dist2 >= edge_distance_threshold )
1093 break;
1094 }
1095
1096 } while ( ( seg1 = seg1->edge_next ) != edge->first );
1097
1098 if ( dist2 >= edge_distance_threshold )
1099 continue;
1100 }
1101
1102 best = dist;
1103 found = edge;
1104 }
1105 }
1106
1107 if ( !found )
1108 {
1109 AF_Edge edge;
1110
1111
1112 /* insert a new edge in the list and */
1113 /* sort according to the position */
1114 error = af_axis_hints_new_edge( axis, seg->pos,
1115 (AF_Direction)seg->dir, 0,
1116 memory, &edge );
1117 if ( error )
1118 goto Exit;
1119
1120 /* add the segment to the new edge's list */
1121 FT_ZERO( edge );
1122
1123 edge->first = seg;
1124 edge->last = seg;
1125 edge->dir = seg->dir;
1126 edge->fpos = seg->pos;
1127 edge->opos = FT_MulFix( seg->pos, scale );
1128 edge->pos = edge->opos;
1129 seg->edge_next = seg;
1130 }
1131 else
1132 {
1133 /* if an edge was found, simply add the segment to the edge's */
1134 /* list */
1135 seg->edge_next = found->first;
1136 found->last->edge_next = seg;
1137 found->last = seg;
1138 }
1139 }
1140
1141 /*******************************************************************
1142 *
1143 * Good, we now compute each edge's properties according to the
1144 * segments found on its position. Basically, these are
1145 *
1146 * - the edge's main direction
1147 * - stem edge, serif edge or both (which defaults to stem then)
1148 * - rounded edge, straight or both (which defaults to straight)
1149 * - link for edge
1150 *
1151 */
1152
1153 /* first of all, set the `edge' field in each segment -- this is */
1154 /* required in order to compute edge links */
1155
1156 /*
1157 * Note that removing this loop and setting the `edge' field of each
1158 * segment directly in the code above slows down execution speed for
1159 * some reasons on platforms like the Sun.
1160 */
1161 {
1162 AF_Edge edges = axis->edges;
1163 AF_Edge edge_limit = FT_OFFSET( edges, axis->num_edges );
1164 AF_Edge edge;
1165
1166
1167 for ( edge = edges; edge < edge_limit; edge++ )
1168 {
1169 seg = edge->first;
1170 if ( seg )
1171 do
1172 {
1173 seg->edge = edge;
1174 seg = seg->edge_next;
1175
1176 } while ( seg != edge->first );
1177 }
1178
1179 /* now compute each edge properties */
1180 for ( edge = edges; edge < edge_limit; edge++ )
1181 {
1182 FT_Int is_round = 0; /* does it contain round segments? */
1183 FT_Int is_straight = 0; /* does it contain straight segments? */
1184
1185
1186 seg = edge->first;
1187 if ( !seg )
1188 goto Skip_Loop;
1189
1190 do
1191 {
1192 FT_Bool is_serif;
1193
1194
1195 /* check for roundness of segment */
1196 if ( seg->flags & AF_EDGE_ROUND )
1197 is_round++;
1198 else
1199 is_straight++;
1200
1201 /* check for links -- if seg->serif is set, then seg->link must */
1202 /* be ignored */
1203 is_serif = FT_BOOL( seg->serif && seg->serif->edge != edge );
1204
1205 if ( seg->link || is_serif )
1206 {
1207 AF_Edge edge2;
1208 AF_Segment seg2;
1209
1210
1211 edge2 = edge->link;
1212 seg2 = seg->link;
1213
1214 if ( is_serif )
1215 {
1216 seg2 = seg->serif;
1217 edge2 = edge->serif;
1218 }
1219
1220 if ( edge2 )
1221 {
1222 FT_Pos edge_delta;
1223 FT_Pos seg_delta;
1224
1225
1226 edge_delta = edge->fpos - edge2->fpos;
1227 if ( edge_delta < 0 )
1228 edge_delta = -edge_delta;
1229
1230 seg_delta = AF_SEGMENT_DIST( seg, seg2 );
1231
1232 if ( seg_delta < edge_delta )
1233 edge2 = seg2->edge;
1234 }
1235 else
1236 edge2 = seg2->edge;
1237
1238 if ( is_serif )
1239 {
1240 edge->serif = edge2;
1241 edge2->flags |= AF_EDGE_SERIF;
1242 }
1243 else
1244 edge->link = edge2;
1245 }
1246
1247 seg = seg->edge_next;
1248
1249 } while ( seg != edge->first );
1250
1251 Skip_Loop:
1252 /* set the round/straight flags */
1253 edge->flags = AF_EDGE_NORMAL;
1254
1255 if ( is_round > 0 && is_round >= is_straight )
1256 edge->flags |= AF_EDGE_ROUND;
1257
1258 /* get rid of serifs if link is set */
1259 /* XXX: This gets rid of many unpleasant artefacts! */
1260 /* Example: the `c' in cour.pfa at size 13 */
1261
1262 if ( edge->serif && edge->link )
1263 edge->serif = NULL;
1264 }
1265 }
1266
1267 Exit:
1268 return error;
1269 }
1270
1271
1272 /* Detect segments and edges for given dimension. */
1273
1274 static FT_Error
1275 af_cjk_hints_detect_features( AF_GlyphHints hints,
1276 AF_Dimension dim )
1277 {
1278 FT_Error error;
1279
1280
1281 error = af_cjk_hints_compute_segments( hints, dim );
1282 if ( !error )
1283 {
1284 af_cjk_hints_link_segments( hints, dim );
1285
1286 error = af_cjk_hints_compute_edges( hints, dim );
1287 }
1288 return error;
1289 }
1290
1291
1292 /* Compute all edges which lie within blue zones. */
1293
1294 static void
1295 af_cjk_hints_compute_blue_edges( AF_GlyphHints hints,
1296 AF_CJKMetrics metrics,
1297 AF_Dimension dim )
1298 {
1299 AF_AxisHints axis = &hints->axis[dim];
1300 AF_Edge edge = axis->edges;
1301 AF_Edge edge_limit = FT_OFFSET( edge, axis->num_edges );
1302 AF_CJKAxis cjk = &metrics->axis[dim];
1303 FT_Fixed scale = cjk->scale;
1304 FT_Pos best_dist0; /* initial threshold */
1305
1306
1307 /* compute the initial threshold as a fraction of the EM size */
1308 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
1309
1310 if ( best_dist0 > 64 / 2 ) /* maximum 1/2 pixel */
1311 best_dist0 = 64 / 2;
1312
1313 /* compute which blue zones are active, i.e. have their scaled */
1314 /* size < 3/4 pixels */
1315
1316 /* If the distant between an edge and a blue zone is shorter than */
1317 /* best_dist0, set the blue zone for the edge. Then search for */
1318 /* the blue zone with the smallest best_dist to the edge. */
1319
1320 for ( ; edge < edge_limit; edge++ )
1321 {
1322 FT_UInt bb;
1323 AF_Width best_blue = NULL;
1324 FT_Pos best_dist = best_dist0;
1325
1326
1327 for ( bb = 0; bb < cjk->blue_count; bb++ )
1328 {
1329 AF_CJKBlue blue = cjk->blues + bb;
1330 FT_Bool is_top_right_blue, is_major_dir;
1331
1332
1333 /* skip inactive blue zones (i.e., those that are too small) */
1334 if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) )
1335 continue;
1336
1337 /* if it is a top zone, check for right edges -- if it is a bottom */
1338 /* zone, check for left edges */
1339 /* */
1340 /* of course, that's for TrueType */
1341 is_top_right_blue =
1342 (FT_Byte)( ( blue->flags & AF_CJK_BLUE_TOP ) != 0 );
1343 is_major_dir =
1344 FT_BOOL( edge->dir == axis->major_dir );
1345
1346 /* if it is a top zone, the edge must be against the major */
1347 /* direction; if it is a bottom zone, it must be in the major */
1348 /* direction */
1349 if ( is_top_right_blue ^ is_major_dir )
1350 {
1351 FT_Pos dist;
1352 AF_Width compare;
1353
1354
1355 /* Compare the edge to the closest blue zone type */
1356 if ( FT_ABS( edge->fpos - blue->ref.org ) >
1357 FT_ABS( edge->fpos - blue->shoot.org ) )
1358 compare = &blue->shoot;
1359 else
1360 compare = &blue->ref;
1361
1362 dist = edge->fpos - compare->org;
1363 if ( dist < 0 )
1364 dist = -dist;
1365
1366 dist = FT_MulFix( dist, scale );
1367 if ( dist < best_dist )
1368 {
1369 best_dist = dist;
1370 best_blue = compare;
1371 }
1372 }
1373 }
1374
1375 if ( best_blue )
1376 edge->blue_edge = best_blue;
1377 }
1378 }
1379
1380
1381 /* Initalize hinting engine. */
1382
1383 FT_LOCAL_DEF( FT_Error )
1384 af_cjk_hints_init( AF_GlyphHints hints,
1385 AF_StyleMetrics metrics_ ) /* AF_CJKMetrics */
1386 {
1387 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
1388 FT_Render_Mode mode;
1389 FT_UInt32 scaler_flags, other_flags;
1390
1391
1392 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics );
1393
1394 /*
1395 * correct x_scale and y_scale when needed, since they may have
1396 * been modified af_cjk_scale_dim above
1397 */
1398 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
1399 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
1400 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
1401 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
1402
1403 /* compute flags depending on render mode, etc. */
1404 mode = metrics->root.scaler.render_mode;
1405
1406 scaler_flags = hints->scaler_flags;
1407 other_flags = 0;
1408
1409 /*
1410 * We snap the width of vertical stems for the monochrome and
1411 * horizontal LCD rendering targets only.
1412 */
1413 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
1414 other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
1415
1416 /*
1417 * We snap the width of horizontal stems for the monochrome and
1418 * vertical LCD rendering targets only.
1419 */
1420 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
1421 other_flags |= AF_LATIN_HINTS_VERT_SNAP;
1422
1423 /*
1424 * We adjust stems to full pixels unless in `light' or `lcd' mode.
1425 */
1426 if ( mode != FT_RENDER_MODE_LIGHT && mode != FT_RENDER_MODE_LCD )
1427 other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
1428
1429 if ( mode == FT_RENDER_MODE_MONO )
1430 other_flags |= AF_LATIN_HINTS_MONO;
1431
1432 scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE;
1433
1434 hints->scaler_flags = scaler_flags;
1435 hints->other_flags = other_flags;
1436
1437 return FT_Err_Ok;
1438 }
1439
1440
1441 /*************************************************************************/
1442 /*************************************************************************/
1443 /***** *****/
1444 /***** C J K G L Y P H G R I D - F I T T I N G *****/
1445 /***** *****/
1446 /*************************************************************************/
1447 /*************************************************************************/
1448
1449 /* Snap a given width in scaled coordinates to one of the */
1450 /* current standard widths. */
1451
1452 static FT_Pos
1453 af_cjk_snap_width( AF_Width widths,
1454 FT_UInt count,
1455 FT_Pos width )
1456 {
1457 FT_UInt n;
1458 FT_Pos best = 64 + 32 + 2;
1459 FT_Pos reference = width;
1460 FT_Pos scaled;
1461
1462
1463 for ( n = 0; n < count; n++ )
1464 {
1465 FT_Pos w;
1466 FT_Pos dist;
1467
1468
1469 w = widths[n].cur;
1470 dist = width - w;
1471 if ( dist < 0 )
1472 dist = -dist;
1473 if ( dist < best )
1474 {
1475 best = dist;
1476 reference = w;
1477 }
1478 }
1479
1480 scaled = FT_PIX_ROUND( reference );
1481
1482 if ( width >= reference )
1483 {
1484 if ( width < scaled + 48 )
1485 width = reference;
1486 }
1487 else
1488 {
1489 if ( width > scaled - 48 )
1490 width = reference;
1491 }
1492
1493 return width;
1494 }
1495
1496
1497 /* Compute the snapped width of a given stem. */
1498 /* There is a lot of voodoo in this function; changing the hard-coded */
1499 /* parameters influence the whole hinting process. */
1500
1501 static FT_Pos
1502 af_cjk_compute_stem_width( AF_GlyphHints hints,
1503 AF_Dimension dim,
1504 FT_Pos width,
1505 FT_UInt base_flags,
1506 FT_UInt stem_flags )
1507 {
1508 AF_CJKMetrics metrics = (AF_CJKMetrics)hints->metrics;
1509 AF_CJKAxis axis = &metrics->axis[dim];
1510 FT_Pos dist = width;
1511 FT_Int sign = 0;
1512 FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT );
1513
1514 FT_UNUSED( base_flags );
1515 FT_UNUSED( stem_flags );
1516
1517
1518 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
1519 return width;
1520
1521 if ( dist < 0 )
1522 {
1523 dist = -width;
1524 sign = 1;
1525 }
1526
1527 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
1528 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
1529 {
1530 /* smooth hinting process: very lightly quantize the stem width */
1531
1532 if ( axis->width_count > 0 )
1533 {
1534 if ( FT_ABS( dist - axis->widths[0].cur ) < 40 )
1535 {
1536 dist = axis->widths[0].cur;
1537 if ( dist < 48 )
1538 dist = 48;
1539
1540 goto Done_Width;
1541 }
1542 }
1543
1544 if ( dist < 54 )
1545 dist += ( 54 - dist ) / 2;
1546 else if ( dist < 3 * 64 )
1547 {
1548 FT_Pos delta;
1549
1550
1551 delta = dist & 63;
1552 dist &= -64;
1553
1554 if ( delta < 10 )
1555 dist += delta;
1556 else if ( delta < 22 )
1557 dist += 10;
1558 else if ( delta < 42 )
1559 dist += delta;
1560 else if ( delta < 54 )
1561 dist += 54;
1562 else
1563 dist += delta;
1564 }
1565 }
1566 else
1567 {
1568 /* strong hinting process: snap the stem width to integer pixels */
1569
1570 dist = af_cjk_snap_width( axis->widths, axis->width_count, dist );
1571
1572 if ( vertical )
1573 {
1574 /* in the case of vertical hinting, always round */
1575 /* the stem heights to integer pixels */
1576
1577 if ( dist >= 64 )
1578 dist = ( dist + 16 ) & ~63;
1579 else
1580 dist = 64;
1581 }
1582 else
1583 {
1584 if ( AF_LATIN_HINTS_DO_MONO( hints ) )
1585 {
1586 /* monochrome horizontal hinting: snap widths to integer pixels */
1587 /* with a different threshold */
1588
1589 if ( dist < 64 )
1590 dist = 64;
1591 else
1592 dist = ( dist + 32 ) & ~63;
1593 }
1594 else
1595 {
1596 /* for horizontal anti-aliased hinting, we adopt a more subtle */
1597 /* approach: we strengthen small stems, round stems whose size */
1598 /* is between 1 and 2 pixels to an integer, otherwise nothing */
1599
1600 if ( dist < 48 )
1601 dist = ( dist + 64 ) >> 1;
1602
1603 else if ( dist < 128 )
1604 dist = ( dist + 22 ) & ~63;
1605 else
1606 /* round otherwise to prevent color fringes in LCD mode */
1607 dist = ( dist + 32 ) & ~63;
1608 }
1609 }
1610 }
1611
1612 Done_Width:
1613 if ( sign )
1614 dist = -dist;
1615
1616 return dist;
1617 }
1618
1619
1620 /* Align one stem edge relative to the previous stem edge. */
1621
1622 static void
1623 af_cjk_align_linked_edge( AF_GlyphHints hints,
1624 AF_Dimension dim,
1625 AF_Edge base_edge,
1626 AF_Edge stem_edge )
1627 {
1628 FT_Pos dist = stem_edge->opos - base_edge->opos;
1629
1630 FT_Pos fitted_width = af_cjk_compute_stem_width( hints, dim, dist,
1631 base_edge->flags,
1632 stem_edge->flags );
1633
1634
1635 stem_edge->pos = base_edge->pos + fitted_width;
1636
1637 FT_TRACE5(( " CJKLINK: edge %td @%d (opos=%.2f) linked to %.2f,"
1638 " dist was %.2f, now %.2f\n",
1639 stem_edge - hints->axis[dim].edges, stem_edge->fpos,
1640 (double)stem_edge->opos / 64,
1641 (double)stem_edge->pos / 64,
1642 (double)dist / 64,
1643 (double)fitted_width / 64 ));
1644 }
1645
1646
1647 /* Shift the coordinates of the `serif' edge by the same amount */
1648 /* as the corresponding `base' edge has been moved already. */
1649
1650 static void
1651 af_cjk_align_serif_edge( AF_GlyphHints hints,
1652 AF_Edge base,
1653 AF_Edge serif )
1654 {
1655 FT_UNUSED( hints );
1656
1657 serif->pos = base->pos + ( serif->opos - base->opos );
1658 }
1659
1660
1661 /*************************************************************************/
1662 /*************************************************************************/
1663 /*************************************************************************/
1664 /**** ****/
1665 /**** E D G E H I N T I N G ****/
1666 /**** ****/
1667 /*************************************************************************/
1668 /*************************************************************************/
1669 /*************************************************************************/
1670
1671
1672#define AF_LIGHT_MODE_MAX_HORZ_GAP 9
1673#define AF_LIGHT_MODE_MAX_VERT_GAP 15
1674#define AF_LIGHT_MODE_MAX_DELTA_ABS 14
1675
1676
1677 static FT_Pos
1678 af_hint_normal_stem( AF_GlyphHints hints,
1679 AF_Edge edge,
1680 AF_Edge edge2,
1681 FT_Pos anchor,
1682 AF_Dimension dim )
1683 {
1684 FT_Pos org_len, cur_len, org_center;
1685 FT_Pos cur_pos1, cur_pos2;
1686 FT_Pos d_off1, u_off1, d_off2, u_off2, delta;
1687 FT_Pos offset;
1688 FT_Pos threshold = 64;
1689
1690
1691 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
1692 {
1693 if ( ( edge->flags & AF_EDGE_ROUND ) &&
1694 ( edge2->flags & AF_EDGE_ROUND ) )
1695 {
1696 if ( dim == AF_DIMENSION_VERT )
1697 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP;
1698 else
1699 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP;
1700 }
1701 else
1702 {
1703 if ( dim == AF_DIMENSION_VERT )
1704 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3;
1705 else
1706 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3;
1707 }
1708 }
1709
1710 org_len = edge2->opos - edge->opos;
1711 cur_len = af_cjk_compute_stem_width( hints, dim, org_len,
1712 edge->flags,
1713 edge2->flags );
1714
1715 org_center = ( edge->opos + edge2->opos ) / 2 + anchor;
1716 cur_pos1 = org_center - cur_len / 2;
1717 cur_pos2 = cur_pos1 + cur_len;
1718 d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 );
1719 d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 );
1720 u_off1 = 64 - d_off1;
1721 u_off2 = 64 - d_off2;
1722 delta = 0;
1723
1724
1725 if ( d_off1 == 0 || d_off2 == 0 )
1726 goto Exit;
1727
1728 if ( cur_len <= threshold )
1729 {
1730 if ( d_off2 < cur_len )
1731 {
1732 if ( u_off1 <= d_off2 )
1733 delta = u_off1;
1734 else
1735 delta = -d_off2;
1736 }
1737
1738 goto Exit;
1739 }
1740
1741 if ( threshold < 64 )
1742 {
1743 if ( d_off1 >= threshold || u_off1 >= threshold ||
1744 d_off2 >= threshold || u_off2 >= threshold )
1745 goto Exit;
1746 }
1747
1748 offset = cur_len & 63;
1749
1750 if ( offset < 32 )
1751 {
1752 if ( u_off1 <= offset || d_off2 <= offset )
1753 goto Exit;
1754 }
1755 else
1756 offset = 64 - threshold;
1757
1758 d_off1 = threshold - u_off1;
1759 u_off1 = u_off1 - offset;
1760 u_off2 = threshold - d_off2;
1761 d_off2 = d_off2 - offset;
1762
1763 if ( d_off1 <= u_off1 )
1764 u_off1 = -d_off1;
1765
1766 if ( d_off2 <= u_off2 )
1767 u_off2 = -d_off2;
1768
1769 if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) )
1770 delta = u_off1;
1771 else
1772 delta = u_off2;
1773
1774 Exit:
1775
1776#if 1
1777 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
1778 {
1779 if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS )
1780 delta = AF_LIGHT_MODE_MAX_DELTA_ABS;
1781 else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS )
1782 delta = -AF_LIGHT_MODE_MAX_DELTA_ABS;
1783 }
1784#endif
1785
1786 cur_pos1 += delta;
1787
1788 if ( edge->opos < edge2->opos )
1789 {
1790 edge->pos = cur_pos1;
1791 edge2->pos = cur_pos1 + cur_len;
1792 }
1793 else
1794 {
1795 edge->pos = cur_pos1 + cur_len;
1796 edge2->pos = cur_pos1;
1797 }
1798
1799 return delta;
1800 }
1801
1802
1803 /* The main grid-fitting routine. */
1804
1805 static void
1806 af_cjk_hint_edges( AF_GlyphHints hints,
1807 AF_Dimension dim )
1808 {
1809 AF_AxisHints axis = &hints->axis[dim];
1810 AF_Edge edges = axis->edges;
1811 AF_Edge edge_limit = FT_OFFSET( edges, axis->num_edges );
1812 FT_PtrDist n_edges;
1813 AF_Edge edge;
1814 AF_Edge anchor = NULL;
1815 FT_Pos delta = 0;
1816 FT_Int skipped = 0;
1817 FT_Bool has_last_stem = FALSE;
1818 FT_Pos last_stem_pos = 0;
1819
1820#ifdef FT_DEBUG_LEVEL_TRACE
1821 FT_UInt num_actions = 0;
1822#endif
1823
1824
1825 FT_TRACE5(( "cjk %s edge hinting (style `%s')\n",
1826 dim == AF_DIMENSION_VERT ? "horizontal" : "vertical",
1827 af_style_names[hints->metrics->style_class->style] ));
1828
1829 /* we begin by aligning all stems relative to the blue zone */
1830
1831 if ( AF_HINTS_DO_BLUES( hints ) )
1832 {
1833 for ( edge = edges; edge < edge_limit; edge++ )
1834 {
1835 AF_Width blue;
1836 AF_Edge edge1, edge2;
1837
1838
1839 if ( edge->flags & AF_EDGE_DONE )
1840 continue;
1841
1842 blue = edge->blue_edge;
1843 edge1 = NULL;
1844 edge2 = edge->link;
1845
1846 if ( blue )
1847 {
1848 edge1 = edge;
1849 }
1850 else if ( edge2 && edge2->blue_edge )
1851 {
1852 blue = edge2->blue_edge;
1853 edge1 = edge2;
1854 edge2 = edge;
1855 }
1856
1857 if ( !edge1 )
1858 continue;
1859
1860#ifdef FT_DEBUG_LEVEL_TRACE
1861 FT_TRACE5(( " CJKBLUE: edge %td @%d (opos=%.2f) snapped to %.2f,"
1862 " was %.2f\n",
1863 edge1 - edges, edge1->fpos, (double)edge1->opos / 64,
1864 (double)blue->fit / 64, (double)edge1->pos / 64 ));
1865
1866 num_actions++;
1867#endif
1868
1869 edge1->pos = blue->fit;
1870 edge1->flags |= AF_EDGE_DONE;
1871
1872 if ( edge2 && !edge2->blue_edge )
1873 {
1874 af_cjk_align_linked_edge( hints, dim, edge1, edge2 );
1875 edge2->flags |= AF_EDGE_DONE;
1876
1877#ifdef FT_DEBUG_LEVEL_TRACE
1878 num_actions++;
1879#endif
1880 }
1881
1882 if ( !anchor )
1883 anchor = edge;
1884 }
1885 }
1886
1887 /* now we align all stem edges. */
1888 for ( edge = edges; edge < edge_limit; edge++ )
1889 {
1890 AF_Edge edge2;
1891
1892
1893 if ( edge->flags & AF_EDGE_DONE )
1894 continue;
1895
1896 /* skip all non-stem edges */
1897 edge2 = edge->link;
1898 if ( !edge2 )
1899 {
1900 skipped++;
1901 continue;
1902 }
1903
1904 /* Some CJK characters have so many stems that
1905 * the hinter is likely to merge two adjacent ones.
1906 * To solve this problem, if either edge of a stem
1907 * is too close to the previous one, we avoid
1908 * aligning the two edges, but rather interpolate
1909 * their locations at the end of this function in
1910 * order to preserve the space between the stems.
1911 */
1912 if ( has_last_stem &&
1913 ( edge->pos < last_stem_pos + 64 ||
1914 edge2->pos < last_stem_pos + 64 ) )
1915 {
1916 skipped++;
1917 continue;
1918 }
1919
1920 /* now align the stem */
1921
1922 /* this should not happen, but it's better to be safe */
1923 if ( edge2->blue_edge )
1924 {
1925 FT_TRACE5(( "ASSERTION FAILED for edge %td\n", edge2 - edges ));
1926
1927 af_cjk_align_linked_edge( hints, dim, edge2, edge );
1928 edge->flags |= AF_EDGE_DONE;
1929
1930#ifdef FT_DEBUG_LEVEL_TRACE
1931 num_actions++;
1932#endif
1933
1934 continue;
1935 }
1936
1937 if ( edge2 < edge )
1938 {
1939 af_cjk_align_linked_edge( hints, dim, edge2, edge );
1940 edge->flags |= AF_EDGE_DONE;
1941
1942#ifdef FT_DEBUG_LEVEL_TRACE
1943 num_actions++;
1944#endif
1945
1946 /* We rarely reaches here it seems;
1947 * usually the two edges belonging
1948 * to one stem are marked as DONE together
1949 */
1950 has_last_stem = TRUE;
1951 last_stem_pos = edge->pos;
1952 continue;
1953 }
1954
1955 if ( dim != AF_DIMENSION_VERT && !anchor )
1956 {
1957
1958#if 0
1959 if ( fixedpitch )
1960 {
1961 AF_Edge left = edge;
1962 AF_Edge right = edge_limit - 1;
1963 AF_EdgeRec left1, left2, right1, right2;
1964 FT_Pos target, center1, center2;
1965 FT_Pos delta1, delta2, d1, d2;
1966
1967
1968 while ( right > left && !right->link )
1969 right--;
1970
1971 left1 = *left;
1972 left2 = *left->link;
1973 right1 = *right->link;
1974 right2 = *right;
1975
1976 delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2;
1977 target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16;
1978
1979 delta1 = delta;
1980 delta1 += af_hint_normal_stem( hints, left, left->link,
1981 delta1, 0 );
1982
1983 if ( left->link != right )
1984 af_hint_normal_stem( hints, right->link, right, delta1, 0 );
1985
1986 center1 = left->pos + ( right->pos - left->pos ) / 2;
1987
1988 if ( center1 >= target )
1989 delta2 = delta - 32;
1990 else
1991 delta2 = delta + 32;
1992
1993 delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 );
1994
1995 if ( delta1 != delta2 )
1996 {
1997 if ( left->link != right )
1998 af_hint_normal_stem( hints, &right1, &right2, delta2, 0 );
1999
2000 center2 = left1.pos + ( right2.pos - left1.pos ) / 2;
2001
2002 d1 = center1 - target;
2003 d2 = center2 - target;
2004
2005 if ( FT_ABS( d2 ) < FT_ABS( d1 ) )
2006 {
2007 left->pos = left1.pos;
2008 left->link->pos = left2.pos;
2009
2010 if ( left->link != right )
2011 {
2012 right->link->pos = right1.pos;
2013 right->pos = right2.pos;
2014 }
2015
2016 delta1 = delta2;
2017 }
2018 }
2019
2020 delta = delta1;
2021 right->link->flags |= AF_EDGE_DONE;
2022 right->flags |= AF_EDGE_DONE;
2023 }
2024 else
2025
2026#endif /* 0 */
2027
2028 delta = af_hint_normal_stem( hints, edge, edge2, 0,
2029 AF_DIMENSION_HORZ );
2030 }
2031 else
2032 af_hint_normal_stem( hints, edge, edge2, delta, dim );
2033
2034#if 0
2035 printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n",
2036 edge - edges, edge2 - edges,
2037 (double)( edge->pos - edge->opos ) / 64,
2038 (double)( edge2->pos - edge2->opos ) / 64 );
2039#endif
2040
2041 anchor = edge;
2042 edge->flags |= AF_EDGE_DONE;
2043 edge2->flags |= AF_EDGE_DONE;
2044 has_last_stem = TRUE;
2045 last_stem_pos = edge2->pos;
2046 }
2047
2048 /* make sure that lowercase m's maintain their symmetry */
2049
2050 /* In general, lowercase m's have six vertical edges if they are sans */
2051 /* serif, or twelve if they are with serifs. This implementation is */
2052 /* based on that assumption, and seems to work very well with most */
2053 /* faces. However, if for a certain face this assumption is not */
2054 /* true, the m is just rendered like before. In addition, any stem */
2055 /* correction will only be applied to symmetrical glyphs (even if the */
2056 /* glyph is not an m), so the potential for unwanted distortion is */
2057 /* relatively low. */
2058
2059 /* We don't handle horizontal edges since we can't easily assure that */
2060 /* the third (lowest) stem aligns with the base line; it might end up */
2061 /* one pixel higher or lower. */
2062
2063 n_edges = edge_limit - edges;
2064 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
2065 {
2066 AF_Edge edge1, edge2, edge3;
2067 FT_Pos dist1, dist2, span;
2068
2069
2070 if ( n_edges == 6 )
2071 {
2072 edge1 = edges;
2073 edge2 = edges + 2;
2074 edge3 = edges + 4;
2075 }
2076 else
2077 {
2078 edge1 = edges + 1;
2079 edge2 = edges + 5;
2080 edge3 = edges + 9;
2081 }
2082
2083 dist1 = edge2->opos - edge1->opos;
2084 dist2 = edge3->opos - edge2->opos;
2085
2086 span = dist1 - dist2;
2087 if ( span < 0 )
2088 span = -span;
2089
2090 if ( edge1->link == edge1 + 1 &&
2091 edge2->link == edge2 + 1 &&
2092 edge3->link == edge3 + 1 && span < 8 )
2093 {
2094 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
2095 edge3->pos -= delta;
2096 if ( edge3->link )
2097 edge3->link->pos -= delta;
2098
2099 /* move the serifs along with the stem */
2100 if ( n_edges == 12 )
2101 {
2102 ( edges + 8 )->pos -= delta;
2103 ( edges + 11 )->pos -= delta;
2104 }
2105
2106 edge3->flags |= AF_EDGE_DONE;
2107 if ( edge3->link )
2108 edge3->link->flags |= AF_EDGE_DONE;
2109 }
2110 }
2111
2112 if ( !skipped )
2113 goto Exit;
2114
2115 /*
2116 * now hint the remaining edges (serifs and single) in order
2117 * to complete our processing
2118 */
2119 for ( edge = edges; edge < edge_limit; edge++ )
2120 {
2121 if ( edge->flags & AF_EDGE_DONE )
2122 continue;
2123
2124 if ( edge->serif )
2125 {
2126 af_cjk_align_serif_edge( hints, edge->serif, edge );
2127 edge->flags |= AF_EDGE_DONE;
2128 skipped--;
2129 }
2130 }
2131
2132 if ( !skipped )
2133 goto Exit;
2134
2135 for ( edge = edges; edge < edge_limit; edge++ )
2136 {
2137 AF_Edge before, after;
2138
2139
2140 if ( edge->flags & AF_EDGE_DONE )
2141 continue;
2142
2143 before = after = edge;
2144
2145 while ( --before >= edges )
2146 if ( before->flags & AF_EDGE_DONE )
2147 break;
2148
2149 while ( ++after < edge_limit )
2150 if ( after->flags & AF_EDGE_DONE )
2151 break;
2152
2153 if ( before >= edges || after < edge_limit )
2154 {
2155 if ( before < edges )
2156 af_cjk_align_serif_edge( hints, after, edge );
2157 else if ( after >= edge_limit )
2158 af_cjk_align_serif_edge( hints, before, edge );
2159 else
2160 {
2161 if ( after->fpos == before->fpos )
2162 edge->pos = before->pos;
2163 else
2164 edge->pos = before->pos +
2165 FT_MulDiv( edge->fpos - before->fpos,
2166 after->pos - before->pos,
2167 after->fpos - before->fpos );
2168 }
2169 }
2170 }
2171
2172 Exit:
2173
2174#ifdef FT_DEBUG_LEVEL_TRACE
2175 if ( !num_actions )
2176 FT_TRACE5(( " (none)\n" ));
2177 FT_TRACE5(( "\n" ));
2178#endif
2179
2180 return;
2181 }
2182
2183
2184 static void
2185 af_cjk_align_edge_points( AF_GlyphHints hints,
2186 AF_Dimension dim )
2187 {
2188 AF_AxisHints axis = & hints->axis[dim];
2189 AF_Edge edges = axis->edges;
2190 AF_Edge edge_limit = FT_OFFSET( edges, axis->num_edges );
2191 AF_Edge edge;
2192 FT_Bool snapping;
2193
2194
2195 snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ &&
2196 AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ||
2197 ( dim == AF_DIMENSION_VERT &&
2198 AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) );
2199
2200 for ( edge = edges; edge < edge_limit; edge++ )
2201 {
2202 /* move the points of each segment */
2203 /* in each edge to the edge's position */
2204 AF_Segment seg = edge->first;
2205
2206
2207 if ( snapping )
2208 {
2209 do
2210 {
2211 AF_Point point = seg->first;
2212
2213
2214 for (;;)
2215 {
2216 if ( dim == AF_DIMENSION_HORZ )
2217 {
2218 point->x = edge->pos;
2219 point->flags |= AF_FLAG_TOUCH_X;
2220 }
2221 else
2222 {
2223 point->y = edge->pos;
2224 point->flags |= AF_FLAG_TOUCH_Y;
2225 }
2226
2227 if ( point == seg->last )
2228 break;
2229
2230 point = point->next;
2231 }
2232
2233 seg = seg->edge_next;
2234
2235 } while ( seg != edge->first );
2236 }
2237 else
2238 {
2239 FT_Pos delta = edge->pos - edge->opos;
2240
2241
2242 do
2243 {
2244 AF_Point point = seg->first;
2245
2246
2247 for (;;)
2248 {
2249 if ( dim == AF_DIMENSION_HORZ )
2250 {
2251 point->x += delta;
2252 point->flags |= AF_FLAG_TOUCH_X;
2253 }
2254 else
2255 {
2256 point->y += delta;
2257 point->flags |= AF_FLAG_TOUCH_Y;
2258 }
2259
2260 if ( point == seg->last )
2261 break;
2262
2263 point = point->next;
2264 }
2265
2266 seg = seg->edge_next;
2267
2268 } while ( seg != edge->first );
2269 }
2270 }
2271 }
2272
2273
2274 /* Apply the complete hinting algorithm to a CJK glyph. */
2275
2276 FT_LOCAL_DEF( FT_Error )
2277 af_cjk_hints_apply( FT_UInt glyph_index,
2278 AF_GlyphHints hints,
2279 FT_Outline* outline,
2280 AF_StyleMetrics metrics_ ) /* AF_CJKMetrics */
2281 {
2282 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
2283
2284 FT_Error error;
2285 int dim;
2286
2287 FT_UNUSED( metrics );
2288 FT_UNUSED( glyph_index );
2289
2290
2291 error = af_glyph_hints_reload( hints, outline );
2292 if ( error )
2293 goto Exit;
2294
2295 /* analyze glyph outline */
2296 if ( AF_HINTS_DO_HORIZONTAL( hints ) )
2297 {
2298 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );
2299 if ( error )
2300 goto Exit;
2301
2302 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_HORZ );
2303 }
2304
2305 if ( AF_HINTS_DO_VERTICAL( hints ) )
2306 {
2307 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );
2308 if ( error )
2309 goto Exit;
2310
2311 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_VERT );
2312 }
2313
2314 /* grid-fit the outline */
2315 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
2316 {
2317 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
2318 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
2319 {
2320 af_cjk_hint_edges( hints, (AF_Dimension)dim );
2321 af_cjk_align_edge_points( hints, (AF_Dimension)dim );
2322 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
2323 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
2324 }
2325 }
2326
2327 af_glyph_hints_save( hints, outline );
2328
2329 Exit:
2330 return error;
2331 }
2332
2333
2334 /*************************************************************************/
2335 /*************************************************************************/
2336 /***** *****/
2337 /***** C J K S C R I P T C L A S S *****/
2338 /***** *****/
2339 /*************************************************************************/
2340 /*************************************************************************/
2341
2342
2343 AF_DEFINE_WRITING_SYSTEM_CLASS(
2344 af_cjk_writing_system_class,
2345
2346 AF_WRITING_SYSTEM_CJK,
2347
2348 sizeof ( AF_CJKMetricsRec ),
2349
2350 (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init, /* style_metrics_init */
2351 (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale, /* style_metrics_scale */
2352 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
2353 (AF_WritingSystem_GetStdWidthsFunc)af_cjk_get_standard_widths, /* style_metrics_getstdw */
2354
2355 (AF_WritingSystem_InitHintsFunc) af_cjk_hints_init, /* style_hints_init */
2356 (AF_WritingSystem_ApplyHintsFunc) af_cjk_hints_apply /* style_hints_apply */
2357 )
2358
2359
2360#else /* !AF_CONFIG_OPTION_CJK */
2361
2362
2363 AF_DEFINE_WRITING_SYSTEM_CLASS(
2364 af_cjk_writing_system_class,
2365
2366 AF_WRITING_SYSTEM_CJK,
2367
2368 sizeof ( AF_CJKMetricsRec ),
2369
2370 (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init */
2371 (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale */
2372 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
2373 (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */
2374
2375 (AF_WritingSystem_InitHintsFunc) NULL, /* style_hints_init */
2376 (AF_WritingSystem_ApplyHintsFunc) NULL /* style_hints_apply */
2377 )
2378
2379
2380#endif /* !AF_CONFIG_OPTION_CJK */
2381
2382
2383/* END */
2384