sdk-world v2026.11.05
PS2 SDK - world tier (copyleft-allowed, non-essential packages)
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afcjk.c
1/****************************************************************************
2 *
3 * afcjk.c
4 *
5 * Auto-fitter hinting routines for CJK writing system (body).
6 *
7 * Copyright (C) 2006-2025 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 FT_ULong shaper_buf_;
94 void* shaper_buf = &shaper_buf_;
95
96 const char* p;
97
98#ifdef FT_DEBUG_LEVEL_TRACE
99 FT_ULong ch = 0;
100#endif
101
102 p = script_class->standard_charstring;
103
104 if ( ft_hb_enabled( metrics->root.globals ) )
105 shaper_buf = af_shaper_buf_create( metrics->root.globals );
106
107 /* We check a list of standard characters. The first match wins. */
108
109 glyph_index = 0;
110 while ( *p )
111 {
112 unsigned int num_idx;
113
114#ifdef FT_DEBUG_LEVEL_TRACE
115 const char* p_old;
116#endif
117
118
119 while ( *p == ' ' )
120 p++;
121
122#ifdef FT_DEBUG_LEVEL_TRACE
123 p_old = p;
124 GET_UTF8_CHAR( ch, p_old );
125#endif
126
127 /* reject input that maps to more than a single glyph */
128 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
129 if ( num_idx > 1 )
130 continue;
131
132 /* otherwise exit loop if we have a result */
133 glyph_index = af_shaper_get_elem( &metrics->root,
134 shaper_buf,
135 0,
136 NULL,
137 NULL );
138 if ( glyph_index )
139 break;
140 }
141
142 af_shaper_buf_destroy( metrics->root.globals, shaper_buf );
143
144 if ( !glyph_index )
145 goto Exit;
146
147 if ( !glyph_index )
148 goto Exit;
149
150 FT_TRACE5(( "standard character: U+%04lX (glyph index %lu)\n",
151 ch, glyph_index ));
152
153 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
154 if ( error || face->glyph->outline.n_points <= 0 )
155 goto Exit;
156
157 FT_ZERO( dummy );
158
159 dummy->units_per_em = metrics->units_per_em;
160
161 scaler->x_scale = 0x10000L;
162 scaler->y_scale = 0x10000L;
163 scaler->x_delta = 0;
164 scaler->y_delta = 0;
165
166 scaler->face = face;
167 scaler->render_mode = FT_RENDER_MODE_NORMAL;
168 scaler->flags = 0;
169
170 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy );
171
172 error = af_glyph_hints_reload( hints, &face->glyph->outline );
173 if ( error )
174 goto Exit;
175
176 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
177 {
178 AF_CJKAxis axis = &metrics->axis[dim];
179 AF_AxisHints axhints = &hints->axis[dim];
180 AF_Segment seg, limit, link;
181 FT_UInt num_widths = 0;
182
183
184 error = af_latin_hints_compute_segments( hints,
185 (AF_Dimension)dim );
186 if ( error )
187 goto Exit;
188
189 /*
190 * We assume that the glyphs selected for the stem width
191 * computation are `featureless' enough so that the linking
192 * algorithm works fine without adjustments of its scoring
193 * function.
194 */
195 af_latin_hints_link_segments( hints,
196 0,
197 NULL,
198 (AF_Dimension)dim );
199
200 seg = axhints->segments;
201 limit = seg + axhints->num_segments;
202
203 for ( ; seg < limit; seg++ )
204 {
205 link = seg->link;
206
207 /* we only consider stem segments there! */
208 if ( link && link->link == seg && link > seg )
209 {
210 FT_Pos dist;
211
212
213 dist = seg->pos - link->pos;
214 if ( dist < 0 )
215 dist = -dist;
216
217 if ( num_widths < AF_CJK_MAX_WIDTHS )
218 axis->widths[num_widths++].org = dist;
219 }
220 }
221
222 /* this also replaces multiple almost identical stem widths */
223 /* with a single one (the value 100 is heuristic) */
224 af_sort_and_quantize_widths( &num_widths, axis->widths,
225 dummy->units_per_em / 100 );
226 axis->width_count = num_widths;
227 }
228
229 Exit:
230 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
231 {
232 AF_CJKAxis axis = &metrics->axis[dim];
233 FT_Pos stdw;
234
235
236 stdw = ( axis->width_count > 0 ) ? axis->widths[0].org
237 : AF_LATIN_CONSTANT( metrics, 50 );
238
239 /* let's try 20% of the smallest width */
240 axis->edge_distance_threshold = stdw / 5;
241 axis->standard_width = stdw;
242 axis->extra_light = 0;
243
244#ifdef FT_DEBUG_LEVEL_TRACE
245 {
246 FT_UInt i;
247
248
249 FT_TRACE5(( "%s widths:\n",
250 dim == AF_DIMENSION_VERT ? "horizontal"
251 : "vertical" ));
252
253 FT_TRACE5(( " %ld (standard)", axis->standard_width ));
254 for ( i = 1; i < axis->width_count; i++ )
255 FT_TRACE5(( " %ld", axis->widths[i].org ));
256
257 FT_TRACE5(( "\n" ));
258 }
259#endif
260 }
261 }
262
263 FT_TRACE5(( "\n" ));
264
265 af_glyph_hints_done( hints );
266 }
267
268
269 /* Find all blue zones. */
270
271 static void
272 af_cjk_metrics_init_blues( AF_CJKMetrics metrics,
273 FT_Face face )
274 {
275 FT_Pos fills[AF_BLUE_STRING_MAX_LEN];
276 FT_Pos flats[AF_BLUE_STRING_MAX_LEN];
277
278 FT_UInt num_fills;
279 FT_UInt num_flats;
280
281 FT_Bool fill;
282
283 AF_CJKBlue blue;
284 FT_Error error;
285 AF_CJKAxis axis;
286 FT_Outline outline;
287
288 AF_StyleClass sc = metrics->root.style_class;
289
290 AF_Blue_Stringset bss = sc->blue_stringset;
291 const AF_Blue_StringRec* bs = &af_blue_stringsets[bss];
292
293 /* If HarfBuzz is not available, we need a pointer to a single */
294 /* unsigned long value. */
295 FT_ULong shaper_buf_;
296 void* shaper_buf = &shaper_buf_;
297
298
299 /* we walk over the blue character strings as specified in the */
300 /* style's entry in the `af_blue_stringset' array, computing its */
301 /* extremum points (depending on the string properties) */
302
303 FT_TRACE5(( "cjk blue zones computation\n" ));
304 FT_TRACE5(( "==========================\n" ));
305 FT_TRACE5(( "\n" ));
306
307 if ( ft_hb_enabled( metrics->root.globals ) )
308 shaper_buf = af_shaper_buf_create( metrics->root.globals );
309
310 for ( ; bs->string != AF_BLUE_STRING_MAX; bs++ )
311 {
312 const char* p = &af_blue_strings[bs->string];
313 FT_Pos* blue_ref;
314 FT_Pos* blue_shoot;
315
316
317 if ( AF_CJK_IS_HORIZ_BLUE( bs ) )
318 axis = &metrics->axis[AF_DIMENSION_HORZ];
319 else
320 axis = &metrics->axis[AF_DIMENSION_VERT];
321
322#ifdef FT_DEBUG_LEVEL_TRACE
323 {
324 FT_String* cjk_blue_name[4] =
325 {
326 (FT_String*)"bottom", /* -- , -- */
327 (FT_String*)"top", /* -- , TOP */
328 (FT_String*)"left", /* HORIZ, -- */
329 (FT_String*)"right" /* HORIZ, TOP */
330 };
331
332
333 FT_TRACE5(( "blue zone %u (%s):\n",
334 axis->blue_count,
335 cjk_blue_name[AF_CJK_IS_HORIZ_BLUE( bs ) |
336 AF_CJK_IS_TOP_BLUE( bs ) ] ));
337 }
338#endif /* FT_DEBUG_LEVEL_TRACE */
339
340 num_fills = 0;
341 num_flats = 0;
342
343 fill = 1; /* start with characters that define fill values */
344 FT_TRACE5(( " [overshoot values]\n" ));
345
346 while ( *p )
347 {
348 FT_ULong glyph_index;
349 FT_Pos best_pos; /* same as points.y or points.x, resp. */
350 FT_Int best_point;
351 FT_Vector* points;
352
353 unsigned int num_idx;
354
355#ifdef FT_DEBUG_LEVEL_TRACE
356 const char* p_old;
357 FT_ULong ch;
358#endif
359
360
361 while ( *p == ' ' )
362 p++;
363
364#ifdef FT_DEBUG_LEVEL_TRACE
365 p_old = p;
366 GET_UTF8_CHAR( ch, p_old );
367#endif
368
369 /* switch to characters that define flat values */
370 if ( *p == '|' )
371 {
372 fill = 0;
373 FT_TRACE5(( " [reference values]\n" ));
374 p++;
375 continue;
376 }
377
378 /* reject input that maps to more than a single glyph */
379 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
380 if ( num_idx > 1 )
381 continue;
382
383 /* load the character in the face -- skip unknown or empty ones */
384 glyph_index = af_shaper_get_elem( &metrics->root,
385 shaper_buf,
386 0,
387 NULL,
388 NULL );
389 if ( glyph_index == 0 )
390 {
391 FT_TRACE5(( " U+%04lX unavailable\n", ch ));
392 continue;
393 }
394
395 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
396 outline = face->glyph->outline;
397 if ( error || outline.n_points <= 2 )
398 {
399 FT_TRACE5(( " U+%04lX contains no (usable) outlines\n", ch ));
400 continue;
401 }
402
403 /* now compute min or max point indices and coordinates */
404 points = outline.points;
405 best_point = -1;
406 best_pos = 0; /* make compiler happy */
407
408 {
409 FT_Int nn;
410 FT_Int pp, first, last;
411
412
413 last = -1;
414 for ( nn = 0; nn < outline.n_contours; nn++ )
415 {
416 first = last + 1;
417 last = outline.contours[nn];
418
419 /* Avoid single-point contours since they are never rasterized. */
420 /* In some fonts, they correspond to mark attachment points */
421 /* which are way outside of the glyph's real outline. */
422 if ( last <= first )
423 continue;
424
425 if ( AF_CJK_IS_HORIZ_BLUE( bs ) )
426 {
427 if ( AF_CJK_IS_RIGHT_BLUE( bs ) )
428 {
429 for ( pp = first; pp <= last; pp++ )
430 if ( best_point < 0 || points[pp].x > best_pos )
431 {
432 best_point = pp;
433 best_pos = points[pp].x;
434 }
435 }
436 else
437 {
438 for ( pp = first; pp <= last; pp++ )
439 if ( best_point < 0 || points[pp].x < best_pos )
440 {
441 best_point = pp;
442 best_pos = points[pp].x;
443 }
444 }
445 }
446 else
447 {
448 if ( AF_CJK_IS_TOP_BLUE( bs ) )
449 {
450 for ( pp = first; pp <= last; pp++ )
451 if ( best_point < 0 || points[pp].y > best_pos )
452 {
453 best_point = pp;
454 best_pos = points[pp].y;
455 }
456 }
457 else
458 {
459 for ( pp = first; pp <= last; pp++ )
460 if ( best_point < 0 || points[pp].y < best_pos )
461 {
462 best_point = pp;
463 best_pos = points[pp].y;
464 }
465 }
466 }
467 }
468
469 FT_TRACE5(( " U+%04lX: best_pos = %5ld\n", ch, best_pos ));
470 }
471
472 if ( fill )
473 fills[num_fills++] = best_pos;
474 else
475 flats[num_flats++] = best_pos;
476
477 } /* end while loop */
478
479 if ( num_flats == 0 && num_fills == 0 )
480 {
481 /*
482 * we couldn't find a single glyph to compute this blue zone,
483 * we will simply ignore it then
484 */
485 FT_TRACE5(( " empty\n" ));
486 continue;
487 }
488
489 /* we have computed the contents of the `fill' and `flats' tables, */
490 /* now determine the reference and overshoot position of the blue -- */
491 /* we simply take the median value after a simple sort */
492 af_sort_pos( num_fills, fills );
493 af_sort_pos( num_flats, flats );
494
495 blue = &axis->blues[axis->blue_count];
496 blue_ref = &blue->ref.org;
497 blue_shoot = &blue->shoot.org;
498
499 axis->blue_count++;
500
501 if ( num_flats == 0 )
502 {
503 *blue_ref =
504 *blue_shoot = fills[num_fills / 2];
505 }
506 else if ( num_fills == 0 )
507 {
508 *blue_ref =
509 *blue_shoot = flats[num_flats / 2];
510 }
511 else
512 {
513 *blue_ref = fills[num_fills / 2];
514 *blue_shoot = flats[num_flats / 2];
515 }
516
517 /* make sure blue_ref >= blue_shoot for top/right or */
518 /* vice versa for bottom/left */
519 if ( *blue_shoot != *blue_ref )
520 {
521 FT_Pos ref = *blue_ref;
522 FT_Pos shoot = *blue_shoot;
523 FT_Bool under_ref = FT_BOOL( shoot < ref );
524
525
526 /* AF_CJK_IS_TOP_BLUE covers `right' and `top' */
527 if ( AF_CJK_IS_TOP_BLUE( bs ) ^ under_ref )
528 {
529 *blue_ref =
530 *blue_shoot = ( shoot + ref ) / 2;
531
532 FT_TRACE5(( " [reference smaller than overshoot,"
533 " taking mean value]\n" ));
534 }
535 }
536
537 blue->flags = 0;
538 if ( AF_CJK_IS_TOP_BLUE( bs ) )
539 blue->flags |= AF_CJK_BLUE_TOP;
540
541 FT_TRACE5(( " -> reference = %ld\n", *blue_ref ));
542 FT_TRACE5(( " overshoot = %ld\n", *blue_shoot ));
543
544 } /* end for loop */
545
546 af_shaper_buf_destroy( metrics->root.globals, shaper_buf );
547
548 FT_TRACE5(( "\n" ));
549
550 return;
551 }
552
553
554 /* Basically the Latin version with type AF_CJKMetrics for metrics. */
555
556 FT_LOCAL_DEF( void )
557 af_cjk_metrics_check_digits( AF_CJKMetrics metrics,
558 FT_Face face )
559 {
560 FT_Bool started = 0, same_width = 1;
561 FT_Long advance = 0, old_advance = 0;
562
563 /* If HarfBuzz is not available, we need a pointer to a single */
564 /* unsigned long value. */
565 FT_ULong shaper_buf_;
566 void* shaper_buf = &shaper_buf_;
567
568 /* in all supported charmaps, digits have character codes 0x30-0x39 */
569 const char digits[] = "0 1 2 3 4 5 6 7 8 9";
570 const char* p;
571
572 FT_UNUSED( face );
573
574
575 p = digits;
576
577 if ( ft_hb_enabled( metrics->root.globals ) )
578 shaper_buf = af_shaper_buf_create( metrics->root.globals );
579
580 while ( *p )
581 {
582 FT_ULong glyph_index;
583 unsigned int num_idx;
584
585
586 /* reject input that maps to more than a single glyph */
587 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
588 if ( num_idx > 1 )
589 continue;
590
591 glyph_index = af_shaper_get_elem( &metrics->root,
592 shaper_buf,
593 0,
594 &advance,
595 NULL );
596 if ( !glyph_index )
597 continue;
598
599 if ( started )
600 {
601 if ( advance != old_advance )
602 {
603 same_width = 0;
604 break;
605 }
606 }
607 else
608 {
609 old_advance = advance;
610 started = 1;
611 }
612 }
613
614 af_shaper_buf_destroy( metrics->root.globals, shaper_buf );
615
616 metrics->root.digits_have_same_width = same_width;
617 }
618
619
620 /* Initialize global metrics. */
621
622 FT_LOCAL_DEF( FT_Error )
623 af_cjk_metrics_init( AF_StyleMetrics metrics_, /* AF_CJKMetrics */
624 FT_Face face )
625 {
626 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
627 FT_CharMap oldmap = face->charmap;
628
629
630 metrics->units_per_em = face->units_per_EM;
631
632 if ( !FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
633 {
634 af_cjk_metrics_init_widths( metrics, face );
635 af_cjk_metrics_init_blues( metrics, face );
636 af_cjk_metrics_check_digits( metrics, face );
637 }
638
639 face->charmap = oldmap;
640 return FT_Err_Ok;
641 }
642
643
644 /* Adjust scaling value, then scale and shift widths */
645 /* and blue zones (if applicable) for given dimension. */
646
647 static void
648 af_cjk_metrics_scale_dim( AF_CJKMetrics metrics,
649 AF_Scaler scaler,
650 AF_Dimension dim )
651 {
652 FT_Fixed scale;
653 FT_Pos delta;
654 AF_CJKAxis axis;
655 FT_UInt nn;
656
657
658 if ( dim == AF_DIMENSION_HORZ )
659 {
660 scale = scaler->x_scale;
661 delta = scaler->x_delta;
662 }
663 else
664 {
665 scale = scaler->y_scale;
666 delta = scaler->y_delta;
667 }
668
669 axis = &metrics->axis[dim];
670
671 if ( axis->org_scale == scale && axis->org_delta == delta )
672 return;
673
674 axis->org_scale = scale;
675 axis->org_delta = delta;
676
677 axis->scale = scale;
678 axis->delta = delta;
679
680 /* scale the blue zones */
681 for ( nn = 0; nn < axis->blue_count; nn++ )
682 {
683 AF_CJKBlue blue = &axis->blues[nn];
684 FT_Pos dist;
685
686
687 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
688 blue->ref.fit = blue->ref.cur;
689 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
690 blue->shoot.fit = blue->shoot.cur;
691 blue->flags &= ~AF_CJK_BLUE_ACTIVE;
692
693 /* a blue zone is only active if it is less than 3/4 pixels tall */
694 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
695 if ( dist <= 48 && dist >= -48 )
696 {
697 FT_Pos delta1, delta2;
698
699
700 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
701
702 /* shoot is under shoot for cjk */
703 delta1 = FT_DivFix( blue->ref.fit, scale ) - blue->shoot.org;
704 delta2 = delta1;
705 if ( delta1 < 0 )
706 delta2 = -delta2;
707
708 delta2 = FT_MulFix( delta2, scale );
709
710 FT_TRACE5(( "delta: %ld", delta1 ));
711 if ( delta2 < 32 )
712 delta2 = 0;
713#if 0
714 else if ( delta2 < 64 )
715 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
716#endif
717 else
718 delta2 = FT_PIX_ROUND( delta2 );
719 FT_TRACE5(( "/%ld\n", delta2 ));
720
721 if ( delta1 < 0 )
722 delta2 = -delta2;
723
724 blue->shoot.fit = blue->ref.fit - delta2;
725
726 FT_TRACE5(( ">> active cjk blue zone %c%u[%ld/%ld]:\n",
727 ( dim == AF_DIMENSION_HORZ ) ? 'H' : 'V',
728 nn, blue->ref.org, blue->shoot.org ));
729 FT_TRACE5(( " ref: cur=%.2f fit=%.2f\n",
730 (double)blue->ref.cur / 64,
731 (double)blue->ref.fit / 64 ));
732 FT_TRACE5(( " shoot: cur=%.2f fit=%.2f\n",
733 (double)blue->shoot.cur / 64,
734 (double)blue->shoot.fit / 64 ));
735
736 blue->flags |= AF_CJK_BLUE_ACTIVE;
737 }
738 }
739 }
740
741
742 /* Scale global values in both directions. */
743
744 FT_LOCAL_DEF( void )
745 af_cjk_metrics_scale( AF_StyleMetrics metrics_, /* AF_CJKMetrics */
746 AF_Scaler scaler )
747 {
748 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
749
750
751 /* we copy the whole structure since the x and y scaling values */
752 /* are not modified, contrary to e.g. the `latin' auto-hinter */
753 metrics->root.scaler = *scaler;
754
755 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
756 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
757 }
758
759
760 /* Extract standard_width from writing system/script specific */
761 /* metrics class. */
762
763 FT_CALLBACK_DEF( void )
764 af_cjk_get_standard_widths( AF_StyleMetrics metrics_, /* AF_CJKMetrics */
765 FT_Pos* stdHW,
766 FT_Pos* stdVW )
767 {
768 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
769
770
771 if ( stdHW )
772 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width;
773
774 if ( stdVW )
775 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width;
776 }
777
778
779 /*************************************************************************/
780 /*************************************************************************/
781 /***** *****/
782 /***** C J K G L Y P H A N A L Y S I S *****/
783 /***** *****/
784 /*************************************************************************/
785 /*************************************************************************/
786
787
788 /* Walk over all contours and compute its segments. */
789
790 static FT_Error
791 af_cjk_hints_compute_segments( AF_GlyphHints hints,
792 AF_Dimension dim )
793 {
794 AF_AxisHints axis = &hints->axis[dim];
795 AF_Segment segments = axis->segments;
796 AF_Segment segment_limit = FT_OFFSET( segments, axis->num_segments );
797 FT_Error error;
798 AF_Segment seg;
799
800
801 error = af_latin_hints_compute_segments( hints, dim );
802 if ( error )
803 return error;
804
805 /* a segment is round if it doesn't have successive */
806 /* on-curve points. */
807 for ( seg = segments; seg < segment_limit; seg++ )
808 {
809 AF_Point pt = seg->first;
810 AF_Point last = seg->last;
811 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL;
812 FT_UInt f1;
813
814
815 seg->flags &= ~AF_EDGE_ROUND;
816
817 for ( ; pt != last; f0 = f1 )
818 {
819 pt = pt->next;
820 f1 = pt->flags & AF_FLAG_CONTROL;
821
822 if ( !f0 && !f1 )
823 break;
824
825 if ( pt == last )
826 seg->flags |= AF_EDGE_ROUND;
827 }
828 }
829
830 return FT_Err_Ok;
831 }
832
833
834 static void
835 af_cjk_hints_link_segments( AF_GlyphHints hints,
836 AF_Dimension dim )
837 {
838 AF_AxisHints axis = &hints->axis[dim];
839 AF_Segment segments = axis->segments;
840 AF_Segment segment_limit = FT_OFFSET( segments, axis->num_segments );
841 AF_Direction major_dir = axis->major_dir;
842 AF_Segment seg1, seg2;
843 FT_Pos len_threshold;
844 FT_Pos dist_threshold;
845
846
847 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
848
849 dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
850 : hints->y_scale;
851 dist_threshold = FT_DivFix( 64 * 3, dist_threshold );
852
853 /* now compare each segment to the others */
854 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
855 {
856 if ( seg1->dir != major_dir )
857 continue;
858
859 for ( seg2 = segments; seg2 < segment_limit; seg2++ )
860 if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 )
861 {
862 FT_Pos dist = seg2->pos - seg1->pos;
863
864
865 if ( dist < 0 )
866 continue;
867
868 {
869 FT_Pos min = seg1->min_coord;
870 FT_Pos max = seg1->max_coord;
871 FT_Pos len;
872
873
874 if ( min < seg2->min_coord )
875 min = seg2->min_coord;
876
877 if ( max > seg2->max_coord )
878 max = seg2->max_coord;
879
880 len = max - min;
881 if ( len >= len_threshold )
882 {
883 if ( dist * 8 < seg1->score * 9 &&
884 ( dist * 8 < seg1->score * 7 || seg1->len < len ) )
885 {
886 seg1->score = dist;
887 seg1->len = len;
888 seg1->link = seg2;
889 }
890
891 if ( dist * 8 < seg2->score * 9 &&
892 ( dist * 8 < seg2->score * 7 || seg2->len < len ) )
893 {
894 seg2->score = dist;
895 seg2->len = len;
896 seg2->link = seg1;
897 }
898 }
899 }
900 }
901 }
902
903 /*
904 * now compute the `serif' segments
905 *
906 * In Hanzi, some strokes are wider on one or both of the ends.
907 * We either identify the stems on the ends as serifs or remove
908 * the linkage, depending on the length of the stems.
909 *
910 */
911
912 {
913 AF_Segment link1, link2;
914
915
916 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
917 {
918 link1 = seg1->link;
919 if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos )
920 continue;
921
922 if ( seg1->score >= dist_threshold )
923 continue;
924
925 for ( seg2 = segments; seg2 < segment_limit; seg2++ )
926 {
927 if ( seg2->pos > seg1->pos || seg1 == seg2 )
928 continue;
929
930 link2 = seg2->link;
931 if ( !link2 || link2->link != seg2 || link2->pos < link1->pos )
932 continue;
933
934 if ( seg1->pos == seg2->pos && link1->pos == link2->pos )
935 continue;
936
937 if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score )
938 continue;
939
940 /* seg2 < seg1 < link1 < link2 */
941
942 if ( seg1->len >= seg2->len * 3 )
943 {
944 AF_Segment seg;
945
946
947 for ( seg = segments; seg < segment_limit; seg++ )
948 {
949 AF_Segment link = seg->link;
950
951
952 if ( link == seg2 )
953 {
954 seg->link = NULL;
955 seg->serif = link1;
956 }
957 else if ( link == link2 )
958 {
959 seg->link = NULL;
960 seg->serif = seg1;
961 }
962 }
963 }
964 else
965 {
966 seg1->link = link1->link = NULL;
967
968 break;
969 }
970 }
971 }
972 }
973
974 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
975 {
976 seg2 = seg1->link;
977
978 if ( seg2 )
979 {
980 if ( seg2->link != seg1 )
981 {
982 seg1->link = NULL;
983
984 if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 )
985 seg1->serif = seg2->link;
986 }
987 }
988 }
989 }
990
991
992 static FT_Error
993 af_cjk_hints_compute_edges( AF_GlyphHints hints,
994 AF_Dimension dim )
995 {
996 AF_AxisHints axis = &hints->axis[dim];
997 FT_Error error = FT_Err_Ok;
998 FT_Memory memory = hints->memory;
999 AF_CJKAxis laxis = &((AF_CJKMetrics)hints->metrics)->axis[dim];
1000
1001 AF_Segment segments = axis->segments;
1002 AF_Segment segment_limit = FT_OFFSET( segments, axis->num_segments );
1003 AF_Segment seg;
1004
1005 FT_Fixed scale;
1006 FT_Pos edge_distance_threshold;
1007
1008
1009 axis->num_edges = 0;
1010
1011 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
1012 : hints->y_scale;
1013
1014 /**********************************************************************
1015 *
1016 * We begin by generating a sorted table of edges for the current
1017 * direction. To do so, we simply scan each segment and try to find
1018 * an edge in our table that corresponds to its position.
1019 *
1020 * If no edge is found, we create and insert a new edge in the
1021 * sorted table. Otherwise, we simply add the segment to the edge's
1022 * list which is then processed in the second step to compute the
1023 * edge's properties.
1024 *
1025 * Note that the edges table is sorted along the segment/edge
1026 * position.
1027 *
1028 */
1029
1030 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
1031 scale );
1032 if ( edge_distance_threshold > 64 / 4 )
1033 edge_distance_threshold = FT_DivFix( 64 / 4, scale );
1034 else
1035 edge_distance_threshold = laxis->edge_distance_threshold;
1036
1037 for ( seg = segments; seg < segment_limit; seg++ )
1038 {
1039 AF_Edge found = NULL;
1040 FT_Pos best = 0xFFFFU;
1041 FT_UInt ee;
1042
1043
1044 /* look for an edge corresponding to the segment */
1045 for ( ee = 0; ee < axis->num_edges; ee++ )
1046 {
1047 AF_Edge edge = axis->edges + ee;
1048 FT_Pos dist;
1049
1050
1051 if ( edge->dir != seg->dir )
1052 continue;
1053
1054 dist = seg->pos - edge->fpos;
1055 if ( dist < 0 )
1056 dist = -dist;
1057
1058 if ( dist < edge_distance_threshold && dist < best )
1059 {
1060 AF_Segment link = seg->link;
1061
1062
1063 /* check whether all linked segments of the candidate edge */
1064 /* can make a single edge. */
1065 if ( link )
1066 {
1067 AF_Segment seg1 = edge->first;
1068 FT_Pos dist2 = 0;
1069
1070
1071 do
1072 {
1073 AF_Segment link1 = seg1->link;
1074
1075
1076 if ( link1 )
1077 {
1078 dist2 = AF_SEGMENT_DIST( link, link1 );
1079 if ( dist2 >= edge_distance_threshold )
1080 break;
1081 }
1082
1083 } while ( ( seg1 = seg1->edge_next ) != edge->first );
1084
1085 if ( dist2 >= edge_distance_threshold )
1086 continue;
1087 }
1088
1089 best = dist;
1090 found = edge;
1091 }
1092 }
1093
1094 if ( !found )
1095 {
1096 AF_Edge edge;
1097
1098
1099 /* insert a new edge in the list and */
1100 /* sort according to the position */
1101 error = af_axis_hints_new_edge( axis, seg->pos,
1102 (AF_Direction)seg->dir, 0,
1103 memory, &edge );
1104 if ( error )
1105 goto Exit;
1106
1107 /* add the segment to the new edge's list */
1108 FT_ZERO( edge );
1109
1110 edge->first = seg;
1111 edge->last = seg;
1112 edge->dir = seg->dir;
1113 edge->fpos = seg->pos;
1114 edge->opos = FT_MulFix( seg->pos, scale );
1115 edge->pos = edge->opos;
1116 seg->edge_next = seg;
1117 }
1118 else
1119 {
1120 /* if an edge was found, simply add the segment to the edge's */
1121 /* list */
1122 seg->edge_next = found->first;
1123 found->last->edge_next = seg;
1124 found->last = seg;
1125 }
1126 }
1127
1128 /*******************************************************************
1129 *
1130 * Good, we now compute each edge's properties according to the
1131 * segments found on its position. Basically, these are
1132 *
1133 * - the edge's main direction
1134 * - stem edge, serif edge or both (which defaults to stem then)
1135 * - rounded edge, straight or both (which defaults to straight)
1136 * - link for edge
1137 *
1138 */
1139
1140 /* first of all, set the `edge' field in each segment -- this is */
1141 /* required in order to compute edge links */
1142
1143 /*
1144 * Note that removing this loop and setting the `edge' field of each
1145 * segment directly in the code above slows down execution speed for
1146 * some reasons on platforms like the Sun.
1147 */
1148 {
1149 AF_Edge edges = axis->edges;
1150 AF_Edge edge_limit = FT_OFFSET( edges, axis->num_edges );
1151 AF_Edge edge;
1152
1153
1154 for ( edge = edges; edge < edge_limit; edge++ )
1155 {
1156 seg = edge->first;
1157 if ( seg )
1158 do
1159 {
1160 seg->edge = edge;
1161 seg = seg->edge_next;
1162
1163 } while ( seg != edge->first );
1164 }
1165
1166 /* now compute each edge properties */
1167 for ( edge = edges; edge < edge_limit; edge++ )
1168 {
1169 FT_Int is_round = 0; /* does it contain round segments? */
1170 FT_Int is_straight = 0; /* does it contain straight segments? */
1171
1172
1173 seg = edge->first;
1174 if ( !seg )
1175 goto Skip_Loop;
1176
1177 do
1178 {
1179 FT_Bool is_serif;
1180
1181
1182 /* check for roundness of segment */
1183 if ( seg->flags & AF_EDGE_ROUND )
1184 is_round++;
1185 else
1186 is_straight++;
1187
1188 /* check for links -- if seg->serif is set, then seg->link must */
1189 /* be ignored */
1190 is_serif = FT_BOOL( seg->serif && seg->serif->edge != edge );
1191
1192 if ( seg->link || is_serif )
1193 {
1194 AF_Edge edge2;
1195 AF_Segment seg2;
1196
1197
1198 edge2 = edge->link;
1199 seg2 = seg->link;
1200
1201 if ( is_serif )
1202 {
1203 seg2 = seg->serif;
1204 edge2 = edge->serif;
1205 }
1206
1207 if ( edge2 )
1208 {
1209 FT_Pos edge_delta;
1210 FT_Pos seg_delta;
1211
1212
1213 edge_delta = edge->fpos - edge2->fpos;
1214 if ( edge_delta < 0 )
1215 edge_delta = -edge_delta;
1216
1217 seg_delta = AF_SEGMENT_DIST( seg, seg2 );
1218
1219 if ( seg_delta < edge_delta )
1220 edge2 = seg2->edge;
1221 }
1222 else
1223 edge2 = seg2->edge;
1224
1225 if ( is_serif )
1226 {
1227 edge->serif = edge2;
1228 edge2->flags |= AF_EDGE_SERIF;
1229 }
1230 else
1231 edge->link = edge2;
1232 }
1233
1234 seg = seg->edge_next;
1235
1236 } while ( seg != edge->first );
1237
1238 Skip_Loop:
1239 /* set the round/straight flags */
1240 edge->flags = AF_EDGE_NORMAL;
1241
1242 if ( is_round > 0 && is_round >= is_straight )
1243 edge->flags |= AF_EDGE_ROUND;
1244
1245 /* get rid of serifs if link is set */
1246 /* XXX: This gets rid of many unpleasant artefacts! */
1247 /* Example: the `c' in cour.pfa at size 13 */
1248
1249 if ( edge->serif && edge->link )
1250 edge->serif = NULL;
1251 }
1252 }
1253
1254 Exit:
1255 return error;
1256 }
1257
1258
1259 /* Detect segments and edges for given dimension. */
1260
1261 static FT_Error
1262 af_cjk_hints_detect_features( AF_GlyphHints hints,
1263 AF_Dimension dim )
1264 {
1265 FT_Error error;
1266
1267
1268 error = af_cjk_hints_compute_segments( hints, dim );
1269 if ( !error )
1270 {
1271 af_cjk_hints_link_segments( hints, dim );
1272
1273 error = af_cjk_hints_compute_edges( hints, dim );
1274 }
1275 return error;
1276 }
1277
1278
1279 /* Compute all edges which lie within blue zones. */
1280
1281 static void
1282 af_cjk_hints_compute_blue_edges( AF_GlyphHints hints,
1283 AF_CJKMetrics metrics,
1284 AF_Dimension dim )
1285 {
1286 AF_AxisHints axis = &hints->axis[dim];
1287 AF_Edge edge = axis->edges;
1288 AF_Edge edge_limit = FT_OFFSET( edge, axis->num_edges );
1289 AF_CJKAxis cjk = &metrics->axis[dim];
1290 FT_Fixed scale = cjk->scale;
1291 FT_Pos best_dist0; /* initial threshold */
1292
1293
1294 /* compute the initial threshold as a fraction of the EM size */
1295 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
1296
1297 if ( best_dist0 > 64 / 2 ) /* maximum 1/2 pixel */
1298 best_dist0 = 64 / 2;
1299
1300 /* compute which blue zones are active, i.e. have their scaled */
1301 /* size < 3/4 pixels */
1302
1303 /* If the distant between an edge and a blue zone is shorter than */
1304 /* best_dist0, set the blue zone for the edge. Then search for */
1305 /* the blue zone with the smallest best_dist to the edge. */
1306
1307 for ( ; edge < edge_limit; edge++ )
1308 {
1309 FT_UInt bb;
1310 AF_Width best_blue = NULL;
1311 FT_Pos best_dist = best_dist0;
1312
1313
1314 for ( bb = 0; bb < cjk->blue_count; bb++ )
1315 {
1316 AF_CJKBlue blue = cjk->blues + bb;
1317 FT_Bool is_top_right_blue, is_major_dir;
1318
1319
1320 /* skip inactive blue zones (i.e., those that are too small) */
1321 if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) )
1322 continue;
1323
1324 /* if it is a top zone, check for right edges -- if it is a bottom */
1325 /* zone, check for left edges */
1326 /* */
1327 /* of course, that's for TrueType */
1328 is_top_right_blue =
1329 (FT_Byte)( ( blue->flags & AF_CJK_BLUE_TOP ) != 0 );
1330 is_major_dir =
1331 FT_BOOL( edge->dir == axis->major_dir );
1332
1333 /* if it is a top zone, the edge must be against the major */
1334 /* direction; if it is a bottom zone, it must be in the major */
1335 /* direction */
1336 if ( is_top_right_blue ^ is_major_dir )
1337 {
1338 FT_Pos dist;
1339 AF_Width compare;
1340
1341
1342 /* Compare the edge to the closest blue zone type */
1343 if ( FT_ABS( edge->fpos - blue->ref.org ) >
1344 FT_ABS( edge->fpos - blue->shoot.org ) )
1345 compare = &blue->shoot;
1346 else
1347 compare = &blue->ref;
1348
1349 dist = edge->fpos - compare->org;
1350 if ( dist < 0 )
1351 dist = -dist;
1352
1353 dist = FT_MulFix( dist, scale );
1354 if ( dist < best_dist )
1355 {
1356 best_dist = dist;
1357 best_blue = compare;
1358 }
1359 }
1360 }
1361
1362 if ( best_blue )
1363 edge->blue_edge = best_blue;
1364 }
1365 }
1366
1367
1368 /* Initialize hinting engine. */
1369
1370 FT_LOCAL_DEF( FT_Error )
1371 af_cjk_hints_init( AF_GlyphHints hints,
1372 AF_StyleMetrics metrics_ ) /* AF_CJKMetrics */
1373 {
1374 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
1375 FT_Render_Mode mode;
1376 FT_UInt32 scaler_flags, other_flags;
1377
1378
1379 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics );
1380
1381 /*
1382 * correct x_scale and y_scale when needed, since they may have
1383 * been modified af_cjk_scale_dim above
1384 */
1385 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
1386 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
1387 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
1388 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
1389
1390 /* compute flags depending on render mode, etc. */
1391 mode = metrics->root.scaler.render_mode;
1392
1393 scaler_flags = hints->scaler_flags;
1394 other_flags = 0;
1395
1396 /*
1397 * We snap the width of vertical stems for the monochrome and
1398 * horizontal LCD rendering targets only.
1399 */
1400 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
1401 other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
1402
1403 /*
1404 * We snap the width of horizontal stems for the monochrome and
1405 * vertical LCD rendering targets only.
1406 */
1407 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
1408 other_flags |= AF_LATIN_HINTS_VERT_SNAP;
1409
1410 /*
1411 * We adjust stems to full pixels unless in `light' or `lcd' mode.
1412 */
1413 if ( mode != FT_RENDER_MODE_LIGHT && mode != FT_RENDER_MODE_LCD )
1414 other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
1415
1416 if ( mode == FT_RENDER_MODE_MONO )
1417 other_flags |= AF_LATIN_HINTS_MONO;
1418
1419 scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE;
1420
1421 hints->scaler_flags = scaler_flags;
1422 hints->other_flags = other_flags;
1423
1424 return FT_Err_Ok;
1425 }
1426
1427
1428 /*************************************************************************/
1429 /*************************************************************************/
1430 /***** *****/
1431 /***** C J K G L Y P H G R I D - F I T T I N G *****/
1432 /***** *****/
1433 /*************************************************************************/
1434 /*************************************************************************/
1435
1436 /* Snap a given width in scaled coordinates to one of the */
1437 /* current standard widths. */
1438
1439 static FT_Pos
1440 af_cjk_snap_width( AF_Width widths,
1441 FT_UInt count,
1442 FT_Pos width )
1443 {
1444 FT_UInt n;
1445 FT_Pos best = 64 + 32 + 2;
1446 FT_Pos reference = width;
1447 FT_Pos scaled;
1448
1449
1450 for ( n = 0; n < count; n++ )
1451 {
1452 FT_Pos w;
1453 FT_Pos dist;
1454
1455
1456 w = widths[n].cur;
1457 dist = width - w;
1458 if ( dist < 0 )
1459 dist = -dist;
1460 if ( dist < best )
1461 {
1462 best = dist;
1463 reference = w;
1464 }
1465 }
1466
1467 scaled = FT_PIX_ROUND( reference );
1468
1469 if ( width >= reference )
1470 {
1471 if ( width < scaled + 48 )
1472 width = reference;
1473 }
1474 else
1475 {
1476 if ( width > scaled - 48 )
1477 width = reference;
1478 }
1479
1480 return width;
1481 }
1482
1483
1484 /* Compute the snapped width of a given stem. */
1485 /* There is a lot of voodoo in this function; changing the hard-coded */
1486 /* parameters influence the whole hinting process. */
1487
1488 static FT_Pos
1489 af_cjk_compute_stem_width( AF_GlyphHints hints,
1490 AF_Dimension dim,
1491 FT_Pos width,
1492 FT_UInt base_flags,
1493 FT_UInt stem_flags )
1494 {
1495 AF_CJKMetrics metrics = (AF_CJKMetrics)hints->metrics;
1496 AF_CJKAxis axis = &metrics->axis[dim];
1497 FT_Pos dist = width;
1498 FT_Int sign = 0;
1499 FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT );
1500
1501 FT_UNUSED( base_flags );
1502 FT_UNUSED( stem_flags );
1503
1504
1505 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
1506 return width;
1507
1508 if ( dist < 0 )
1509 {
1510 dist = -width;
1511 sign = 1;
1512 }
1513
1514 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
1515 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
1516 {
1517 /* smooth hinting process: very lightly quantize the stem width */
1518
1519 if ( axis->width_count > 0 )
1520 {
1521 if ( FT_ABS( dist - axis->widths[0].cur ) < 40 )
1522 {
1523 dist = axis->widths[0].cur;
1524 if ( dist < 48 )
1525 dist = 48;
1526
1527 goto Done_Width;
1528 }
1529 }
1530
1531 if ( dist < 54 )
1532 dist += ( 54 - dist ) / 2;
1533 else if ( dist < 3 * 64 )
1534 {
1535 FT_Pos delta;
1536
1537
1538 delta = dist & 63;
1539 dist &= -64;
1540
1541 if ( delta < 10 )
1542 dist += delta;
1543 else if ( delta < 22 )
1544 dist += 10;
1545 else if ( delta < 42 )
1546 dist += delta;
1547 else if ( delta < 54 )
1548 dist += 54;
1549 else
1550 dist += delta;
1551 }
1552 }
1553 else
1554 {
1555 /* strong hinting process: snap the stem width to integer pixels */
1556
1557 dist = af_cjk_snap_width( axis->widths, axis->width_count, dist );
1558
1559 if ( vertical )
1560 {
1561 /* in the case of vertical hinting, always round */
1562 /* the stem heights to integer pixels */
1563
1564 if ( dist >= 64 )
1565 dist = ( dist + 16 ) & ~63;
1566 else
1567 dist = 64;
1568 }
1569 else
1570 {
1571 if ( AF_LATIN_HINTS_DO_MONO( hints ) )
1572 {
1573 /* monochrome horizontal hinting: snap widths to integer pixels */
1574 /* with a different threshold */
1575
1576 if ( dist < 64 )
1577 dist = 64;
1578 else
1579 dist = ( dist + 32 ) & ~63;
1580 }
1581 else
1582 {
1583 /* for horizontal anti-aliased hinting, we adopt a more subtle */
1584 /* approach: we strengthen small stems, round stems whose size */
1585 /* is between 1 and 2 pixels to an integer, otherwise nothing */
1586
1587 if ( dist < 48 )
1588 dist = ( dist + 64 ) >> 1;
1589
1590 else if ( dist < 128 )
1591 dist = ( dist + 22 ) & ~63;
1592 else
1593 /* round otherwise to prevent color fringes in LCD mode */
1594 dist = ( dist + 32 ) & ~63;
1595 }
1596 }
1597 }
1598
1599 Done_Width:
1600 if ( sign )
1601 dist = -dist;
1602
1603 return dist;
1604 }
1605
1606
1607 /* Align one stem edge relative to the previous stem edge. */
1608
1609 static void
1610 af_cjk_align_linked_edge( AF_GlyphHints hints,
1611 AF_Dimension dim,
1612 AF_Edge base_edge,
1613 AF_Edge stem_edge )
1614 {
1615 FT_Pos dist = stem_edge->opos - base_edge->opos;
1616
1617 FT_Pos fitted_width = af_cjk_compute_stem_width( hints, dim, dist,
1618 base_edge->flags,
1619 stem_edge->flags );
1620
1621
1622 stem_edge->pos = base_edge->pos + fitted_width;
1623
1624 FT_TRACE5(( " CJKLINK: edge %td @%d (opos=%.2f) linked to %.2f,"
1625 " dist was %.2f, now %.2f\n",
1626 stem_edge - hints->axis[dim].edges, stem_edge->fpos,
1627 (double)stem_edge->opos / 64,
1628 (double)stem_edge->pos / 64,
1629 (double)dist / 64,
1630 (double)fitted_width / 64 ));
1631 }
1632
1633
1634 /* Shift the coordinates of the `serif' edge by the same amount */
1635 /* as the corresponding `base' edge has been moved already. */
1636
1637 static void
1638 af_cjk_align_serif_edge( AF_GlyphHints hints,
1639 AF_Edge base,
1640 AF_Edge serif )
1641 {
1642 FT_UNUSED( hints );
1643
1644 serif->pos = base->pos + ( serif->opos - base->opos );
1645 }
1646
1647
1648 /*************************************************************************/
1649 /*************************************************************************/
1650 /*************************************************************************/
1651 /**** ****/
1652 /**** E D G E H I N T I N G ****/
1653 /**** ****/
1654 /*************************************************************************/
1655 /*************************************************************************/
1656 /*************************************************************************/
1657
1658
1659#define AF_LIGHT_MODE_MAX_HORZ_GAP 9
1660#define AF_LIGHT_MODE_MAX_VERT_GAP 15
1661#define AF_LIGHT_MODE_MAX_DELTA_ABS 14
1662
1663
1664 static FT_Pos
1665 af_hint_normal_stem( AF_GlyphHints hints,
1666 AF_Edge edge,
1667 AF_Edge edge2,
1668 FT_Pos anchor,
1669 AF_Dimension dim )
1670 {
1671 FT_Pos org_len, cur_len, org_center;
1672 FT_Pos cur_pos1, cur_pos2;
1673 FT_Pos d_off1, u_off1, d_off2, u_off2, delta;
1674 FT_Pos offset;
1675 FT_Pos threshold = 64;
1676
1677
1678 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
1679 {
1680 if ( ( edge->flags & AF_EDGE_ROUND ) &&
1681 ( edge2->flags & AF_EDGE_ROUND ) )
1682 {
1683 if ( dim == AF_DIMENSION_VERT )
1684 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP;
1685 else
1686 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP;
1687 }
1688 else
1689 {
1690 if ( dim == AF_DIMENSION_VERT )
1691 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3;
1692 else
1693 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3;
1694 }
1695 }
1696
1697 org_len = edge2->opos - edge->opos;
1698 cur_len = af_cjk_compute_stem_width( hints, dim, org_len,
1699 edge->flags,
1700 edge2->flags );
1701
1702 org_center = ( edge->opos + edge2->opos ) / 2 + anchor;
1703 cur_pos1 = org_center - cur_len / 2;
1704 cur_pos2 = cur_pos1 + cur_len;
1705 d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 );
1706 d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 );
1707 u_off1 = 64 - d_off1;
1708 u_off2 = 64 - d_off2;
1709 delta = 0;
1710
1711
1712 if ( d_off1 == 0 || d_off2 == 0 )
1713 goto Exit;
1714
1715 if ( cur_len <= threshold )
1716 {
1717 if ( d_off2 < cur_len )
1718 {
1719 if ( u_off1 <= d_off2 )
1720 delta = u_off1;
1721 else
1722 delta = -d_off2;
1723 }
1724
1725 goto Exit;
1726 }
1727
1728 if ( threshold < 64 )
1729 {
1730 if ( d_off1 >= threshold || u_off1 >= threshold ||
1731 d_off2 >= threshold || u_off2 >= threshold )
1732 goto Exit;
1733 }
1734
1735 offset = cur_len & 63;
1736
1737 if ( offset < 32 )
1738 {
1739 if ( u_off1 <= offset || d_off2 <= offset )
1740 goto Exit;
1741 }
1742 else
1743 offset = 64 - threshold;
1744
1745 d_off1 = threshold - u_off1;
1746 u_off1 = u_off1 - offset;
1747 u_off2 = threshold - d_off2;
1748 d_off2 = d_off2 - offset;
1749
1750 if ( d_off1 <= u_off1 )
1751 u_off1 = -d_off1;
1752
1753 if ( d_off2 <= u_off2 )
1754 u_off2 = -d_off2;
1755
1756 if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) )
1757 delta = u_off1;
1758 else
1759 delta = u_off2;
1760
1761 Exit:
1762
1763#if 1
1764 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
1765 {
1766 if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS )
1767 delta = AF_LIGHT_MODE_MAX_DELTA_ABS;
1768 else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS )
1769 delta = -AF_LIGHT_MODE_MAX_DELTA_ABS;
1770 }
1771#endif
1772
1773 cur_pos1 += delta;
1774
1775 if ( edge->opos < edge2->opos )
1776 {
1777 edge->pos = cur_pos1;
1778 edge2->pos = cur_pos1 + cur_len;
1779 }
1780 else
1781 {
1782 edge->pos = cur_pos1 + cur_len;
1783 edge2->pos = cur_pos1;
1784 }
1785
1786 return delta;
1787 }
1788
1789
1790 /* The main grid-fitting routine. */
1791
1792 static void
1793 af_cjk_hint_edges( AF_GlyphHints hints,
1794 AF_Dimension dim )
1795 {
1796 AF_AxisHints axis = &hints->axis[dim];
1797 AF_Edge edges = axis->edges;
1798 AF_Edge edge_limit = FT_OFFSET( edges, axis->num_edges );
1799 FT_PtrDist n_edges;
1800 AF_Edge edge;
1801 AF_Edge anchor = NULL;
1802 FT_Pos delta = 0;
1803 FT_Int skipped = 0;
1804 FT_Bool has_last_stem = FALSE;
1805 FT_Pos last_stem_pos = 0;
1806
1807#ifdef FT_DEBUG_LEVEL_TRACE
1808 FT_UInt num_actions = 0;
1809#endif
1810
1811
1812 FT_TRACE5(( "cjk %s edge hinting (style `%s')\n",
1813 dim == AF_DIMENSION_VERT ? "horizontal" : "vertical",
1814 af_style_names[hints->metrics->style_class->style] ));
1815
1816 /* we begin by aligning all stems relative to the blue zone */
1817
1818 if ( AF_HINTS_DO_BLUES( hints ) )
1819 {
1820 for ( edge = edges; edge < edge_limit; edge++ )
1821 {
1822 AF_Width blue;
1823 AF_Edge edge1, edge2;
1824
1825
1826 if ( edge->flags & AF_EDGE_DONE )
1827 continue;
1828
1829 blue = edge->blue_edge;
1830 edge1 = NULL;
1831 edge2 = edge->link;
1832
1833 if ( blue )
1834 {
1835 edge1 = edge;
1836 }
1837 else if ( edge2 && edge2->blue_edge )
1838 {
1839 blue = edge2->blue_edge;
1840 edge1 = edge2;
1841 edge2 = edge;
1842 }
1843
1844 if ( !edge1 )
1845 continue;
1846
1847#ifdef FT_DEBUG_LEVEL_TRACE
1848 FT_TRACE5(( " CJKBLUE: edge %td @%d (opos=%.2f) snapped to %.2f,"
1849 " was %.2f\n",
1850 edge1 - edges, edge1->fpos, (double)edge1->opos / 64,
1851 (double)blue->fit / 64, (double)edge1->pos / 64 ));
1852
1853 num_actions++;
1854#endif
1855
1856 edge1->pos = blue->fit;
1857 edge1->flags |= AF_EDGE_DONE;
1858
1859 if ( edge2 && !edge2->blue_edge )
1860 {
1861 af_cjk_align_linked_edge( hints, dim, edge1, edge2 );
1862 edge2->flags |= AF_EDGE_DONE;
1863
1864#ifdef FT_DEBUG_LEVEL_TRACE
1865 num_actions++;
1866#endif
1867 }
1868
1869 if ( !anchor )
1870 anchor = edge;
1871 }
1872 }
1873
1874 /* now we align all stem edges. */
1875 for ( edge = edges; edge < edge_limit; edge++ )
1876 {
1877 AF_Edge edge2;
1878
1879
1880 if ( edge->flags & AF_EDGE_DONE )
1881 continue;
1882
1883 /* skip all non-stem edges */
1884 edge2 = edge->link;
1885 if ( !edge2 )
1886 {
1887 skipped++;
1888 continue;
1889 }
1890
1891 /* Some CJK characters have so many stems that
1892 * the hinter is likely to merge two adjacent ones.
1893 * To solve this problem, if either edge of a stem
1894 * is too close to the previous one, we avoid
1895 * aligning the two edges, but rather interpolate
1896 * their locations at the end of this function in
1897 * order to preserve the space between the stems.
1898 */
1899 if ( has_last_stem &&
1900 ( edge->pos < last_stem_pos + 64 ||
1901 edge2->pos < last_stem_pos + 64 ) )
1902 {
1903 skipped++;
1904 continue;
1905 }
1906
1907 /* now align the stem */
1908
1909 /* this should not happen, but it's better to be safe */
1910 if ( edge2->blue_edge )
1911 {
1912 FT_TRACE5(( "ASSERTION FAILED for edge %td\n", edge2 - edges ));
1913
1914 af_cjk_align_linked_edge( hints, dim, edge2, edge );
1915 edge->flags |= AF_EDGE_DONE;
1916
1917#ifdef FT_DEBUG_LEVEL_TRACE
1918 num_actions++;
1919#endif
1920
1921 continue;
1922 }
1923
1924 if ( edge2 < edge )
1925 {
1926 af_cjk_align_linked_edge( hints, dim, edge2, edge );
1927 edge->flags |= AF_EDGE_DONE;
1928
1929#ifdef FT_DEBUG_LEVEL_TRACE
1930 num_actions++;
1931#endif
1932
1933 /* We rarely reaches here it seems;
1934 * usually the two edges belonging
1935 * to one stem are marked as DONE together
1936 */
1937 has_last_stem = TRUE;
1938 last_stem_pos = edge->pos;
1939 continue;
1940 }
1941
1942 if ( dim != AF_DIMENSION_VERT && !anchor )
1943 {
1944
1945#if 0
1946 if ( fixedpitch )
1947 {
1948 AF_Edge left = edge;
1949 AF_Edge right = edge_limit - 1;
1950 AF_EdgeRec left1, left2, right1, right2;
1951 FT_Pos target, center1, center2;
1952 FT_Pos delta1, delta2, d1, d2;
1953
1954
1955 while ( right > left && !right->link )
1956 right--;
1957
1958 left1 = *left;
1959 left2 = *left->link;
1960 right1 = *right->link;
1961 right2 = *right;
1962
1963 delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2;
1964 target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16;
1965
1966 delta1 = delta;
1967 delta1 += af_hint_normal_stem( hints, left, left->link,
1968 delta1, 0 );
1969
1970 if ( left->link != right )
1971 af_hint_normal_stem( hints, right->link, right, delta1, 0 );
1972
1973 center1 = left->pos + ( right->pos - left->pos ) / 2;
1974
1975 if ( center1 >= target )
1976 delta2 = delta - 32;
1977 else
1978 delta2 = delta + 32;
1979
1980 delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 );
1981
1982 if ( delta1 != delta2 )
1983 {
1984 if ( left->link != right )
1985 af_hint_normal_stem( hints, &right1, &right2, delta2, 0 );
1986
1987 center2 = left1.pos + ( right2.pos - left1.pos ) / 2;
1988
1989 d1 = center1 - target;
1990 d2 = center2 - target;
1991
1992 if ( FT_ABS( d2 ) < FT_ABS( d1 ) )
1993 {
1994 left->pos = left1.pos;
1995 left->link->pos = left2.pos;
1996
1997 if ( left->link != right )
1998 {
1999 right->link->pos = right1.pos;
2000 right->pos = right2.pos;
2001 }
2002
2003 delta1 = delta2;
2004 }
2005 }
2006
2007 delta = delta1;
2008 right->link->flags |= AF_EDGE_DONE;
2009 right->flags |= AF_EDGE_DONE;
2010 }
2011 else
2012
2013#endif /* 0 */
2014
2015 delta = af_hint_normal_stem( hints, edge, edge2, 0,
2016 AF_DIMENSION_HORZ );
2017 }
2018 else
2019 af_hint_normal_stem( hints, edge, edge2, delta, dim );
2020
2021#if 0
2022 printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n",
2023 edge - edges, edge2 - edges,
2024 (double)( edge->pos - edge->opos ) / 64,
2025 (double)( edge2->pos - edge2->opos ) / 64 );
2026#endif
2027
2028 anchor = edge;
2029 edge->flags |= AF_EDGE_DONE;
2030 edge2->flags |= AF_EDGE_DONE;
2031 has_last_stem = TRUE;
2032 last_stem_pos = edge2->pos;
2033 }
2034
2035 /* make sure that lowercase m's maintain their symmetry */
2036
2037 /* In general, lowercase m's have six vertical edges if they are sans */
2038 /* serif, or twelve if they are with serifs. This implementation is */
2039 /* based on that assumption, and seems to work very well with most */
2040 /* faces. However, if for a certain face this assumption is not */
2041 /* true, the m is just rendered like before. In addition, any stem */
2042 /* correction will only be applied to symmetrical glyphs (even if the */
2043 /* glyph is not an m), so the potential for unwanted distortion is */
2044 /* relatively low. */
2045
2046 /* We don't handle horizontal edges since we can't easily assure that */
2047 /* the third (lowest) stem aligns with the base line; it might end up */
2048 /* one pixel higher or lower. */
2049
2050 n_edges = edge_limit - edges;
2051 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
2052 {
2053 AF_Edge edge1, edge2, edge3;
2054 FT_Pos dist1, dist2, span;
2055
2056
2057 if ( n_edges == 6 )
2058 {
2059 edge1 = edges;
2060 edge2 = edges + 2;
2061 edge3 = edges + 4;
2062 }
2063 else
2064 {
2065 edge1 = edges + 1;
2066 edge2 = edges + 5;
2067 edge3 = edges + 9;
2068 }
2069
2070 dist1 = edge2->opos - edge1->opos;
2071 dist2 = edge3->opos - edge2->opos;
2072
2073 span = dist1 - dist2;
2074 if ( span < 0 )
2075 span = -span;
2076
2077 if ( edge1->link == edge1 + 1 &&
2078 edge2->link == edge2 + 1 &&
2079 edge3->link == edge3 + 1 && span < 8 )
2080 {
2081 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
2082 edge3->pos -= delta;
2083 if ( edge3->link )
2084 edge3->link->pos -= delta;
2085
2086 /* move the serifs along with the stem */
2087 if ( n_edges == 12 )
2088 {
2089 ( edges + 8 )->pos -= delta;
2090 ( edges + 11 )->pos -= delta;
2091 }
2092
2093 edge3->flags |= AF_EDGE_DONE;
2094 if ( edge3->link )
2095 edge3->link->flags |= AF_EDGE_DONE;
2096 }
2097 }
2098
2099 if ( !skipped )
2100 goto Exit;
2101
2102 /*
2103 * now hint the remaining edges (serifs and single) in order
2104 * to complete our processing
2105 */
2106 for ( edge = edges; edge < edge_limit; edge++ )
2107 {
2108 if ( edge->flags & AF_EDGE_DONE )
2109 continue;
2110
2111 if ( edge->serif )
2112 {
2113 af_cjk_align_serif_edge( hints, edge->serif, edge );
2114 edge->flags |= AF_EDGE_DONE;
2115 skipped--;
2116 }
2117 }
2118
2119 if ( !skipped )
2120 goto Exit;
2121
2122 for ( edge = edges; edge < edge_limit; edge++ )
2123 {
2124 AF_Edge before, after;
2125
2126
2127 if ( edge->flags & AF_EDGE_DONE )
2128 continue;
2129
2130 before = after = edge;
2131
2132 while ( --before >= edges )
2133 if ( before->flags & AF_EDGE_DONE )
2134 break;
2135
2136 while ( ++after < edge_limit )
2137 if ( after->flags & AF_EDGE_DONE )
2138 break;
2139
2140 if ( before >= edges || after < edge_limit )
2141 {
2142 if ( before < edges )
2143 af_cjk_align_serif_edge( hints, after, edge );
2144 else if ( after >= edge_limit )
2145 af_cjk_align_serif_edge( hints, before, edge );
2146 else
2147 {
2148 if ( after->fpos == before->fpos )
2149 edge->pos = before->pos;
2150 else
2151 edge->pos = before->pos +
2152 FT_MulDiv( edge->fpos - before->fpos,
2153 after->pos - before->pos,
2154 after->fpos - before->fpos );
2155 }
2156 }
2157 }
2158
2159 Exit:
2160
2161#ifdef FT_DEBUG_LEVEL_TRACE
2162 if ( !num_actions )
2163 FT_TRACE5(( " (none)\n" ));
2164 FT_TRACE5(( "\n" ));
2165#endif
2166
2167 return;
2168 }
2169
2170
2171 static void
2172 af_cjk_align_edge_points( AF_GlyphHints hints,
2173 AF_Dimension dim )
2174 {
2175 AF_AxisHints axis = &hints->axis[dim];
2176 AF_Edge edges = axis->edges;
2177 AF_Edge edge_limit = FT_OFFSET( edges, axis->num_edges );
2178 AF_Edge edge;
2179 FT_Bool snapping;
2180
2181
2182 snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ &&
2183 AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ||
2184 ( dim == AF_DIMENSION_VERT &&
2185 AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) );
2186
2187 for ( edge = edges; edge < edge_limit; edge++ )
2188 {
2189 /* move the points of each segment */
2190 /* in each edge to the edge's position */
2191 AF_Segment seg = edge->first;
2192
2193
2194 if ( snapping )
2195 {
2196 do
2197 {
2198 AF_Point point = seg->first;
2199
2200
2201 for (;;)
2202 {
2203 if ( dim == AF_DIMENSION_HORZ )
2204 {
2205 point->x = edge->pos;
2206 point->flags |= AF_FLAG_TOUCH_X;
2207 }
2208 else
2209 {
2210 point->y = edge->pos;
2211 point->flags |= AF_FLAG_TOUCH_Y;
2212 }
2213
2214 if ( point == seg->last )
2215 break;
2216
2217 point = point->next;
2218 }
2219
2220 seg = seg->edge_next;
2221
2222 } while ( seg != edge->first );
2223 }
2224 else
2225 {
2226 FT_Pos delta = edge->pos - edge->opos;
2227
2228
2229 do
2230 {
2231 AF_Point point = seg->first;
2232
2233
2234 for (;;)
2235 {
2236 if ( dim == AF_DIMENSION_HORZ )
2237 {
2238 point->x += delta;
2239 point->flags |= AF_FLAG_TOUCH_X;
2240 }
2241 else
2242 {
2243 point->y += delta;
2244 point->flags |= AF_FLAG_TOUCH_Y;
2245 }
2246
2247 if ( point == seg->last )
2248 break;
2249
2250 point = point->next;
2251 }
2252
2253 seg = seg->edge_next;
2254
2255 } while ( seg != edge->first );
2256 }
2257 }
2258 }
2259
2260
2261 /* Apply the complete hinting algorithm to a CJK glyph. */
2262
2263 FT_LOCAL_DEF( FT_Error )
2264 af_cjk_hints_apply( FT_UInt glyph_index,
2265 AF_GlyphHints hints,
2266 FT_Outline* outline,
2267 AF_StyleMetrics metrics_ ) /* AF_CJKMetrics */
2268 {
2269 AF_CJKMetrics metrics = (AF_CJKMetrics)metrics_;
2270
2271 FT_Error error;
2272 int dim;
2273
2274 FT_UNUSED( metrics );
2275 FT_UNUSED( glyph_index );
2276
2277
2278 error = af_glyph_hints_reload( hints, outline );
2279 if ( error )
2280 goto Exit;
2281
2282 /* analyze glyph outline */
2283 if ( AF_HINTS_DO_HORIZONTAL( hints ) )
2284 {
2285 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );
2286 if ( error )
2287 goto Exit;
2288
2289 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_HORZ );
2290 }
2291
2292 if ( AF_HINTS_DO_VERTICAL( hints ) )
2293 {
2294 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );
2295 if ( error )
2296 goto Exit;
2297
2298 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_VERT );
2299 }
2300
2301 /* grid-fit the outline */
2302 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
2303 {
2304 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
2305 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
2306 {
2307 af_cjk_hint_edges( hints, (AF_Dimension)dim );
2308 af_cjk_align_edge_points( hints, (AF_Dimension)dim );
2309 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
2310 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
2311 }
2312 }
2313
2314 af_glyph_hints_save( hints, outline );
2315
2316 Exit:
2317 return error;
2318 }
2319
2320
2321 /*************************************************************************/
2322 /*************************************************************************/
2323 /***** *****/
2324 /***** C J K S C R I P T C L A S S *****/
2325 /***** *****/
2326 /*************************************************************************/
2327 /*************************************************************************/
2328
2329
2330 AF_DEFINE_WRITING_SYSTEM_CLASS(
2331 af_cjk_writing_system_class,
2332
2333 AF_WRITING_SYSTEM_CJK,
2334
2335 sizeof ( AF_CJKMetricsRec ),
2336
2337 (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init, /* style_metrics_init */
2338 (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale, /* style_metrics_scale */
2339 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
2340 (AF_WritingSystem_GetStdWidthsFunc)af_cjk_get_standard_widths, /* style_metrics_getstdw */
2341
2342 (AF_WritingSystem_InitHintsFunc) af_cjk_hints_init, /* style_hints_init */
2343 (AF_WritingSystem_ApplyHintsFunc) af_cjk_hints_apply /* style_hints_apply */
2344 )
2345
2346
2347#else /* !AF_CONFIG_OPTION_CJK */
2348
2349
2350 AF_DEFINE_WRITING_SYSTEM_CLASS(
2351 af_cjk_writing_system_class,
2352
2353 AF_WRITING_SYSTEM_CJK,
2354
2355 sizeof ( AF_CJKMetricsRec ),
2356
2357 (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init */
2358 (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale */
2359 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
2360 (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */
2361
2362 (AF_WritingSystem_InitHintsFunc) NULL, /* style_hints_init */
2363 (AF_WritingSystem_ApplyHintsFunc) NULL /* style_hints_apply */
2364 )
2365
2366
2367#endif /* !AF_CONFIG_OPTION_CJK */
2368
2369
2370/* END */