1 /***************************************************************************/
2 /* */
3 /* afcjk.c */
4 /* */
5 /* Auto-fitter hinting routines for CJK writing system (body). */
6 /* */
7 /* Copyright 2006-2018 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 <ft2build.h>
26 #include FT_ADVANCES_H
27 #include FT_INTERNAL_DEBUG_H
28
29 #include "afglobal.h"
30 #include "afpic.h"
31 #include "aflatin.h"
32 #include "afcjk.h"
33
34
35 #ifdef AF_CONFIG_OPTION_CJK
36
37 #undef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT
38
39 #include "aferrors.h"
40
41
42 #ifdef AF_CONFIG_OPTION_USE_WARPER
43 #include "afwarp.h"
44 #endif
45
46
47 /*************************************************************************/
48 /* */
49 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
50 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
51 /* messages during execution. */
52 /* */
53 #undef FT_COMPONENT
54 #define FT_COMPONENT trace_afcjk
55
56
57 /*************************************************************************/
58 /*************************************************************************/
59 /***** *****/
60 /***** C J K G L O B A L M E T R I C S *****/
61 /***** *****/
62 /*************************************************************************/
63 /*************************************************************************/
64
65
66 /* Basically the Latin version with AF_CJKMetrics */
67 /* to replace AF_LatinMetrics. */
68
69 FT_LOCAL_DEF( void )
70 af_cjk_metrics_init_widths( AF_CJKMetrics metrics,
71 FT_Face face )
72 {
73 /* scan the array of segments in each direction */
74 AF_GlyphHintsRec hints[1];
75
76
77 FT_TRACE5(( "\n"
78 "cjk standard widths computation (style `%s')\n"
79 "===================================================\n"
80 "\n",
81 af_style_names[metrics->root.style_class->style] ));
82
83 af_glyph_hints_init( hints, face->memory );
84
85 metrics->axis[AF_DIMENSION_HORZ].width_count = 0;
86 metrics->axis[AF_DIMENSION_VERT].width_count = 0;
87
88 {
89 FT_Error error;
90 FT_ULong glyph_index;
91 int dim;
92 AF_CJKMetricsRec dummy[1];
93 AF_Scaler scaler = &dummy->root.scaler;
94
95 #ifdef FT_CONFIG_OPTION_PIC
96 AF_FaceGlobals globals = metrics->root.globals;
97 #endif
98
99 AF_StyleClass style_class = metrics->root.style_class;
100 AF_ScriptClass script_class = AF_SCRIPT_CLASSES_GET
101 [style_class->script];
102
103 void* shaper_buf;
104 const char* p;
105
106 #ifdef FT_DEBUG_LEVEL_TRACE
107 FT_ULong ch = 0;
108 #endif
109
110 p = script_class->standard_charstring;
111 shaper_buf = af_shaper_buf_create( face );
112
113 /* We check a list of standard characters. The first match wins. */
114
115 glyph_index = 0;
116 while ( *p )
117 {
118 unsigned int num_idx;
119
120 #ifdef FT_DEBUG_LEVEL_TRACE
121 const char* p_old;
122 #endif
123
124
125 while ( *p == ' ' )
126 p++;
127
128 #ifdef FT_DEBUG_LEVEL_TRACE
129 p_old = p;
130 GET_UTF8_CHAR( ch, p_old );
131 #endif
132
133 /* reject input that maps to more than a single glyph */
134 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
135 if ( num_idx > 1 )
136 continue;
137
138 /* otherwise exit loop if we have a result */
139 glyph_index = af_shaper_get_elem( &metrics->root,
140 shaper_buf,
141 0,
142 NULL,
143 NULL );
144 if ( glyph_index )
145 break;
146 }
147
148 af_shaper_buf_destroy( face, shaper_buf );
149
150 if ( !glyph_index )
151 goto Exit;
152
153 if ( !glyph_index )
154 goto Exit;
155
156 FT_TRACE5(( "standard character: U+%04lX (glyph index %d)\n",
157 ch, glyph_index ));
158
159 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
160 if ( error || face->glyph->outline.n_points <= 0 )
161 goto Exit;
162
163 FT_ZERO( dummy );
164
165 dummy->units_per_em = metrics->units_per_em;
166
167 scaler->x_scale = 0x10000L;
168 scaler->y_scale = 0x10000L;
169 scaler->x_delta = 0;
170 scaler->y_delta = 0;
171
172 scaler->face = face;
173 scaler->render_mode = FT_RENDER_MODE_NORMAL;
174 scaler->flags = 0;
175
176 af_glyph_hints_rescale( hints, (AF_StyleMetrics)dummy );
177
178 error = af_glyph_hints_reload( hints, &face->glyph->outline );
179 if ( error )
180 goto Exit;
181
182 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
183 {
184 AF_CJKAxis axis = &metrics->axis[dim];
185 AF_AxisHints axhints = &hints->axis[dim];
186 AF_Segment seg, limit, link;
187 FT_UInt num_widths = 0;
188
189
190 error = af_latin_hints_compute_segments( hints,
191 (AF_Dimension)dim );
192 if ( error )
193 goto Exit;
194
195 /*
196 * We assume that the glyphs selected for the stem width
197 * computation are `featureless' enough so that the linking
198 * algorithm works fine without adjustments of its scoring
199 * function.
200 */
201 af_latin_hints_link_segments( hints,
202 0,
203 NULL,
204 (AF_Dimension)dim );
205
206 seg = axhints->segments;
207 limit = seg + axhints->num_segments;
208
209 for ( ; seg < limit; seg++ )
210 {
211 link = seg->link;
212
213 /* we only consider stem segments there! */
214 if ( link && link->link == seg && link > seg )
215 {
216 FT_Pos dist;
217
218
219 dist = seg->pos - link->pos;
220 if ( dist < 0 )
221 dist = -dist;
222
223 if ( num_widths < AF_CJK_MAX_WIDTHS )
224 axis->widths[num_widths++].org = dist;
225 }
226 }
227
228 /* this also replaces multiple almost identical stem widths */
229 /* with a single one (the value 100 is heuristic) */
230 af_sort_and_quantize_widths( &num_widths, axis->widths,
231 dummy->units_per_em / 100 );
232 axis->width_count = num_widths;
233 }
234
235 Exit:
236 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
237 {
238 AF_CJKAxis axis = &metrics->axis[dim];
239 FT_Pos stdw;
240
241
242 stdw = ( axis->width_count > 0 ) ? axis->widths[0].org
243 : AF_LATIN_CONSTANT( metrics, 50 );
244
245 /* let's try 20% of the smallest width */
246 axis->edge_distance_threshold = stdw / 5;
247 axis->standard_width = stdw;
248 axis->extra_light = 0;
249
250 #ifdef FT_DEBUG_LEVEL_TRACE
251 {
252 FT_UInt i;
253
254
255 FT_TRACE5(( "%s widths:\n",
256 dim == AF_DIMENSION_VERT ? "horizontal"
257 : "vertical" ));
258
259 FT_TRACE5(( " %d (standard)", axis->standard_width ));
260 for ( i = 1; i < axis->width_count; i++ )
261 FT_TRACE5(( " %d", axis->widths[i].org ));
262
263 FT_TRACE5(( "\n" ));
264 }
265 #endif
266 }
267 }
268
269 FT_TRACE5(( "\n" ));
270
271 af_glyph_hints_done( hints );
272 }
273
274
275 /* Find all blue zones. */
276
277 static void
278 af_cjk_metrics_init_blues( AF_CJKMetrics metrics,
279 FT_Face face )
280 {
281 FT_Pos fills[AF_BLUE_STRING_MAX_LEN];
282 FT_Pos flats[AF_BLUE_STRING_MAX_LEN];
283
284 FT_UInt num_fills;
285 FT_UInt num_flats;
286
287 FT_Bool fill;
288
289 AF_CJKBlue blue;
290 FT_Error error;
291 AF_CJKAxis axis;
292 FT_Outline outline;
293
294 AF_StyleClass sc = metrics->root.style_class;
295
296 AF_Blue_Stringset bss = sc->blue_stringset;
297 const AF_Blue_StringRec* bs = &af_blue_stringsets[bss];
298
299 void* shaper_buf;
300
301
302 /* we walk over the blue character strings as specified in the */
303 /* style's entry in the `af_blue_stringset' array, computing its */
304 /* extremum points (depending on the string properties) */
305
306 FT_TRACE5(( "cjk blue zones computation\n"
307 "==========================\n"
308 "\n" ));
309
310 shaper_buf = af_shaper_buf_create( face );
311
312 for ( ; bs->string != AF_BLUE_STRING_MAX; bs++ )
313 {
314 const char* p = &af_blue_strings[bs->string];
315 FT_Pos* blue_ref;
316 FT_Pos* blue_shoot;
317
318
319 if ( AF_CJK_IS_HORIZ_BLUE( bs ) )
320 axis = &metrics->axis[AF_DIMENSION_HORZ];
321 else
322 axis = &metrics->axis[AF_DIMENSION_VERT];
323
324 #ifdef FT_DEBUG_LEVEL_TRACE
325 {
326 FT_String* cjk_blue_name[4] =
327 {
328 (FT_String*)"bottom", /* -- , -- */
329 (FT_String*)"top", /* -- , TOP */
330 (FT_String*)"left", /* HORIZ, -- */
331 (FT_String*)"right" /* HORIZ, TOP */
332 };
333
334
335 FT_TRACE5(( "blue zone %d (%s):\n",
336 axis->blue_count,
337 cjk_blue_name[AF_CJK_IS_HORIZ_BLUE( bs ) |
338 AF_CJK_IS_TOP_BLUE( bs ) ] ));
339 }
340 #endif /* FT_DEBUG_LEVEL_TRACE */
341
342 num_fills = 0;
343 num_flats = 0;
344
345 fill = 1; /* start with characters that define fill values */
346 FT_TRACE5(( " [overshoot values]\n" ));
347
348 while ( *p )
349 {
350 FT_ULong glyph_index;
351 FT_Pos best_pos; /* same as points.y or points.x, resp. */
352 FT_Int best_point;
353 FT_Vector* points;
354
355 unsigned int num_idx;
356
357 #ifdef FT_DEBUG_LEVEL_TRACE
358 const char* p_old;
359 FT_ULong ch;
360 #endif
361
362
363 while ( *p == ' ' )
364 p++;
365
366 #ifdef FT_DEBUG_LEVEL_TRACE
367 p_old = p;
368 GET_UTF8_CHAR( ch, p_old );
369 #endif
370
371 /* switch to characters that define flat values */
372 if ( *p == '|' )
373 {
374 fill = 0;
375 FT_TRACE5(( " [reference values]\n" ));
376 p++;
377 continue;
378 }
379
380 /* reject input that maps to more than a single glyph */
381 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
382 if ( num_idx > 1 )
383 continue;
384
385 /* load the character in the face -- skip unknown or empty ones */
386 glyph_index = af_shaper_get_elem( &metrics->root,
387 shaper_buf,
388 0,
389 NULL,
390 NULL );
391 if ( glyph_index == 0 )
392 {
393 FT_TRACE5(( " U+%04lX unavailable\n", ch ));
394 continue;
395 }
396
397 error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
398 outline = face->glyph->outline;
399 if ( error || outline.n_points <= 2 )
400 {
401 FT_TRACE5(( " U+%04lX contains no (usable) outlines\n", ch ));
402 continue;
403 }
404
405 /* now compute min or max point indices and coordinates */
406 points = outline.points;
407 best_point = -1;
408 best_pos = 0; /* make compiler happy */
409
410 {
411 FT_Int nn;
412 FT_Int first = 0;
413 FT_Int last = -1;
414
415
416 for ( nn = 0; nn < outline.n_contours; first = last + 1, nn++ )
417 {
418 FT_Int pp;
419
420
421 last = outline.contours[nn];
422
423 /* Avoid single-point contours since they are never rasterized. */
424 /* In some fonts, they correspond to mark attachment points */
425 /* which are way outside of the glyph's real outline. */
426 if ( last <= first )
427 continue;
428
429 if ( AF_CJK_IS_HORIZ_BLUE( bs ) )
430 {
431 if ( AF_CJK_IS_RIGHT_BLUE( bs ) )
432 {
433 for ( pp = first; pp <= last; pp++ )
434 if ( best_point < 0 || points[pp].x > best_pos )
435 {
436 best_point = pp;
437 best_pos = points[pp].x;
438 }
439 }
440 else
441 {
442 for ( pp = first; pp <= last; pp++ )
443 if ( best_point < 0 || points[pp].x < best_pos )
444 {
445 best_point = pp;
446 best_pos = points[pp].x;
447 }
448 }
449 }
450 else
451 {
452 if ( AF_CJK_IS_TOP_BLUE( bs ) )
453 {
454 for ( pp = first; pp <= last; pp++ )
455 if ( best_point < 0 || points[pp].y > best_pos )
456 {
457 best_point = pp;
458 best_pos = points[pp].y;
459 }
460 }
461 else
462 {
463 for ( pp = first; pp <= last; pp++ )
464 if ( best_point < 0 || points[pp].y < best_pos )
465 {
466 best_point = pp;
467 best_pos = points[pp].y;
468 }
469 }
470 }
471 }
472
473 FT_TRACE5(( " U+%04lX: best_pos = %5ld\n", ch, best_pos ));
474 }
475
476 if ( fill )
477 fills[num_fills++] = best_pos;
478 else
479 flats[num_flats++] = best_pos;
480
481 } /* end while loop */
482
483 if ( num_flats == 0 && num_fills == 0 )
484 {
485 /*
486 * we couldn't find a single glyph to compute this blue zone,
487 * we will simply ignore it then
488 */
489 FT_TRACE5(( " empty\n" ));
490 continue;
491 }
492
493 /* we have computed the contents of the `fill' and `flats' tables, */
494 /* now determine the reference and overshoot position of the blue -- */
495 /* we simply take the median value after a simple sort */
496 af_sort_pos( num_fills, fills );
497 af_sort_pos( num_flats, flats );
498
499 blue = &axis->blues[axis->blue_count];
500 blue_ref = &blue->ref.org;
501 blue_shoot = &blue->shoot.org;
502
503 axis->blue_count++;
504
505 if ( num_flats == 0 )
506 {
507 *blue_ref =
508 *blue_shoot = fills[num_fills / 2];
509 }
510 else if ( num_fills == 0 )
511 {
512 *blue_ref =
513 *blue_shoot = flats[num_flats / 2];
514 }
515 else
516 {
517 *blue_ref = fills[num_fills / 2];
518 *blue_shoot = flats[num_flats / 2];
519 }
520
521 /* make sure blue_ref >= blue_shoot for top/right or */
522 /* vice versa for bottom/left */
523 if ( *blue_shoot != *blue_ref )
524 {
525 FT_Pos ref = *blue_ref;
526 FT_Pos shoot = *blue_shoot;
527 FT_Bool under_ref = FT_BOOL( shoot < ref );
528
529
530 /* AF_CJK_IS_TOP_BLUE covers `right' and `top' */
531 if ( AF_CJK_IS_TOP_BLUE( bs ) ^ under_ref )
532 {
533 *blue_ref =
534 *blue_shoot = ( shoot + ref ) / 2;
535
536 FT_TRACE5(( " [reference smaller than overshoot,"
537 " taking mean value]\n" ));
538 }
539 }
540
541 blue->flags = 0;
542 if ( AF_CJK_IS_TOP_BLUE( bs ) )
543 blue->flags |= AF_CJK_BLUE_TOP;
544
545 FT_TRACE5(( " -> reference = %ld\n"
546 " overshoot = %ld\n",
547 *blue_ref, *blue_shoot ));
548
549 } /* end for loop */
550
551 af_shaper_buf_destroy( face, shaper_buf );
552
553 FT_TRACE5(( "\n" ));
554
555 return;
556 }
557
558
559 /* Basically the Latin version with type AF_CJKMetrics for metrics. */
560
561 FT_LOCAL_DEF( void )
562 af_cjk_metrics_check_digits( AF_CJKMetrics metrics,
563 FT_Face face )
564 {
565 FT_Bool started = 0, same_width = 1;
566 FT_Fixed advance = 0, old_advance = 0;
567
568 void* shaper_buf;
569
570 /* in all supported charmaps, digits have character codes 0x30-0x39 */
571 const char digits[] = "0 1 2 3 4 5 6 7 8 9";
572 const char* p;
573
574
575 p = digits;
576 shaper_buf = af_shaper_buf_create( face );
577
578 while ( *p )
579 {
580 FT_ULong glyph_index;
581 unsigned int num_idx;
582
583
584 /* reject input that maps to more than a single glyph */
585 p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
586 if ( num_idx > 1 )
587 continue;
588
589 glyph_index = af_shaper_get_elem( &metrics->root,
590 shaper_buf,
591 0,
592 &advance,
593 NULL );
594 if ( !glyph_index )
595 continue;
596
597 if ( started )
598 {
599 if ( advance != old_advance )
600 {
601 same_width = 0;
602 break;
603 }
604 }
605 else
606 {
607 old_advance = advance;
608 started = 1;
609 }
610 }
611
612 af_shaper_buf_destroy( face, shaper_buf );
613
614 metrics->root.digits_have_same_width = same_width;
615 }
616
617
618 /* Initialize global metrics. */
619
620 FT_LOCAL_DEF( FT_Error )
621 af_cjk_metrics_init( AF_CJKMetrics metrics,
622 FT_Face face )
623 {
624 FT_CharMap oldmap = face->charmap;
625
626
627 metrics->units_per_em = face->units_per_EM;
628
629 if ( !FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
630 {
631 af_cjk_metrics_init_widths( metrics, face );
632 af_cjk_metrics_init_blues( metrics, face );
633 af_cjk_metrics_check_digits( metrics, face );
634 }
635
636 FT_Set_Charmap( face, oldmap );
637 return FT_Err_Ok;
638 }
639
640
641 /* Adjust scaling value, then scale and shift widths */
642 /* and blue zones (if applicable) for given dimension. */
643
644 static void
645 af_cjk_metrics_scale_dim( AF_CJKMetrics metrics,
646 AF_Scaler scaler,
647 AF_Dimension dim )
648 {
649 FT_Fixed scale;
650 FT_Pos delta;
651 AF_CJKAxis axis;
652 FT_UInt nn;
653
654
655 if ( dim == AF_DIMENSION_HORZ )
656 {
657 scale = scaler->x_scale;
658 delta = scaler->x_delta;
659 }
660 else
661 {
662 scale = scaler->y_scale;
663 delta = scaler->y_delta;
664 }
665
666 axis = &metrics->axis[dim];
667
668 if ( axis->org_scale == scale && axis->org_delta == delta )
669 return;
670
671 axis->org_scale = scale;
672 axis->org_delta = delta;
673
674 axis->scale = scale;
675 axis->delta = delta;
676
677 /* scale the blue zones */
678 for ( nn = 0; nn < axis->blue_count; nn++ )
679 {
680 AF_CJKBlue blue = &axis->blues[nn];
681 FT_Pos dist;
682
683
684 blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
685 blue->ref.fit = blue->ref.cur;
686 blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
687 blue->shoot.fit = blue->shoot.cur;
688 blue->flags &= ~AF_CJK_BLUE_ACTIVE;
689
690 /* a blue zone is only active if it is less than 3/4 pixels tall */
691 dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
692 if ( dist <= 48 && dist >= -48 )
693 {
694 FT_Pos delta1, delta2;
695
696
697 blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
698
699 /* shoot is under shoot for cjk */
700 delta1 = FT_DivFix( blue->ref.fit, scale ) - blue->shoot.org;
701 delta2 = delta1;
702 if ( delta1 < 0 )
703 delta2 = -delta2;
704
705 delta2 = FT_MulFix( delta2, scale );
706
707 FT_TRACE5(( "delta: %d", delta1 ));
708 if ( delta2 < 32 )
709 delta2 = 0;
710 #if 0
711 else if ( delta2 < 64 )
712 delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
713 #endif
714 else
715 delta2 = FT_PIX_ROUND( delta2 );
716 FT_TRACE5(( "/%d\n", delta2 ));
717
718 if ( delta1 < 0 )
719 delta2 = -delta2;
720
721 blue->shoot.fit = blue->ref.fit - delta2;
722
723 FT_TRACE5(( ">> active cjk blue zone %c%d[%ld/%ld]:\n"
724 " ref: cur=%.2f fit=%.2f\n"
725 " shoot: cur=%.2f fit=%.2f\n",
726 ( dim == AF_DIMENSION_HORZ ) ? 'H' : 'V',
727 nn, blue->ref.org, blue->shoot.org,
728 blue->ref.cur / 64.0, blue->ref.fit / 64.0,
729 blue->shoot.cur / 64.0, blue->shoot.fit / 64.0 ));
730
731 blue->flags |= AF_CJK_BLUE_ACTIVE;
732 }
733 }
734 }
735
736
737 /* Scale global values in both directions. */
738
739 FT_LOCAL_DEF( void )
740 af_cjk_metrics_scale( AF_CJKMetrics metrics,
741 AF_Scaler scaler )
742 {
743 /* we copy the whole structure since the x and y scaling values */
744 /* are not modified, contrary to e.g. the `latin' auto-hinter */
745 metrics->root.scaler = *scaler;
746
747 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
748 af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
749 }
750
751
752 /* Extract standard_width from writing system/script specific */
753 /* metrics class. */
754
755 FT_LOCAL_DEF( void )
756 af_cjk_get_standard_widths( AF_CJKMetrics metrics,
757 FT_Pos* stdHW,
758 FT_Pos* stdVW )
759 {
760 if ( stdHW )
761 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width;
762
763 if ( stdVW )
764 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width;
765 }
766
767
768 /*************************************************************************/
769 /*************************************************************************/
770 /***** *****/
771 /***** C J K G L Y P H A N A L Y S I S *****/
772 /***** *****/
773 /*************************************************************************/
774 /*************************************************************************/
775
776
777 /* Walk over all contours and compute its segments. */
778
779 static FT_Error
780 af_cjk_hints_compute_segments( AF_GlyphHints hints,
781 AF_Dimension dim )
782 {
783 AF_AxisHints axis = &hints->axis[dim];
784 AF_Segment segments = axis->segments;
785 AF_Segment segment_limit = segments + axis->num_segments;
786 FT_Error error;
787 AF_Segment seg;
788
789
790 error = af_latin_hints_compute_segments( hints, dim );
791 if ( error )
792 return error;
793
794 /* a segment is round if it doesn't have successive */
795 /* on-curve points. */
796 for ( seg = segments; seg < segment_limit; seg++ )
797 {
798 AF_Point pt = seg->first;
799 AF_Point last = seg->last;
800 FT_UInt f0 = pt->flags & AF_FLAG_CONTROL;
801 FT_UInt f1;
802
803
804 seg->flags &= ~AF_EDGE_ROUND;
805
806 for ( ; pt != last; f0 = f1 )
807 {
808 pt = pt->next;
809 f1 = pt->flags & AF_FLAG_CONTROL;
810
811 if ( !f0 && !f1 )
812 break;
813
814 if ( pt == last )
815 seg->flags |= AF_EDGE_ROUND;
816 }
817 }
818
819 return FT_Err_Ok;
820 }
821
822
823 static void
824 af_cjk_hints_link_segments( AF_GlyphHints hints,
825 AF_Dimension dim )
826 {
827 AF_AxisHints axis = &hints->axis[dim];
828 AF_Segment segments = axis->segments;
829 AF_Segment segment_limit = segments + axis->num_segments;
830 AF_Direction major_dir = axis->major_dir;
831 AF_Segment seg1, seg2;
832 FT_Pos len_threshold;
833 FT_Pos dist_threshold;
834
835
836 len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
837
838 dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
839 : hints->y_scale;
840 dist_threshold = FT_DivFix( 64 * 3, dist_threshold );
841
842 /* now compare each segment to the others */
843 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
844 {
845 if ( seg1->dir != major_dir )
846 continue;
847
848 for ( seg2 = segments; seg2 < segment_limit; seg2++ )
849 if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 )
850 {
851 FT_Pos dist = seg2->pos - seg1->pos;
852
853
854 if ( dist < 0 )
855 continue;
856
857 {
858 FT_Pos min = seg1->min_coord;
859 FT_Pos max = seg1->max_coord;
860 FT_Pos len;
861
862
863 if ( min < seg2->min_coord )
864 min = seg2->min_coord;
865
866 if ( max > seg2->max_coord )
867 max = seg2->max_coord;
868
869 len = max - min;
870 if ( len >= len_threshold )
871 {
872 if ( dist * 8 < seg1->score * 9 &&
873 ( dist * 8 < seg1->score * 7 || seg1->len < len ) )
874 {
875 seg1->score = dist;
876 seg1->len = len;
877 seg1->link = seg2;
878 }
879
880 if ( dist * 8 < seg2->score * 9 &&
881 ( dist * 8 < seg2->score * 7 || seg2->len < len ) )
882 {
883 seg2->score = dist;
884 seg2->len = len;
885 seg2->link = seg1;
886 }
887 }
888 }
889 }
890 }
891
892 /*
893 * now compute the `serif' segments
894 *
895 * In Hanzi, some strokes are wider on one or both of the ends.
896 * We either identify the stems on the ends as serifs or remove
897 * the linkage, depending on the length of the stems.
898 *
899 */
900
901 {
902 AF_Segment link1, link2;
903
904
905 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
906 {
907 link1 = seg1->link;
908 if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos )
909 continue;
910
911 if ( seg1->score >= dist_threshold )
912 continue;
913
914 for ( seg2 = segments; seg2 < segment_limit; seg2++ )
915 {
916 if ( seg2->pos > seg1->pos || seg1 == seg2 )
917 continue;
918
919 link2 = seg2->link;
920 if ( !link2 || link2->link != seg2 || link2->pos < link1->pos )
921 continue;
922
923 if ( seg1->pos == seg2->pos && link1->pos == link2->pos )
924 continue;
925
926 if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score )
927 continue;
928
929 /* seg2 < seg1 < link1 < link2 */
930
931 if ( seg1->len >= seg2->len * 3 )
932 {
933 AF_Segment seg;
934
935
936 for ( seg = segments; seg < segment_limit; seg++ )
937 {
938 AF_Segment link = seg->link;
939
940
941 if ( link == seg2 )
942 {
943 seg->link = NULL;
944 seg->serif = link1;
945 }
946 else if ( link == link2 )
947 {
948 seg->link = NULL;
949 seg->serif = seg1;
950 }
951 }
952 }
953 else
954 {
955 seg1->link = link1->link = NULL;
956
957 break;
958 }
959 }
960 }
961 }
962
963 for ( seg1 = segments; seg1 < segment_limit; seg1++ )
964 {
965 seg2 = seg1->link;
966
967 if ( seg2 )
968 {
969 if ( seg2->link != seg1 )
970 {
971 seg1->link = NULL;
972
973 if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 )
974 seg1->serif = seg2->link;
975 }
976 }
977 }
978 }
979
980
981 static FT_Error
982 af_cjk_hints_compute_edges( AF_GlyphHints hints,
983 AF_Dimension dim )
984 {
985 AF_AxisHints axis = &hints->axis[dim];
986 FT_Error error = FT_Err_Ok;
987 FT_Memory memory = hints->memory;
988 AF_CJKAxis laxis = &((AF_CJKMetrics)hints->metrics)->axis[dim];
989
990 AF_Segment segments = axis->segments;
991 AF_Segment segment_limit = segments + axis->num_segments;
992 AF_Segment seg;
993
994 FT_Fixed scale;
995 FT_Pos edge_distance_threshold;
996
997
998 axis->num_edges = 0;
999
1000 scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
1001 : hints->y_scale;
1002
1003 /*********************************************************************/
1004 /* */
1005 /* We begin by generating a sorted table of edges for the current */
1006 /* direction. To do so, we simply scan each segment and try to find */
1007 /* an edge in our table that corresponds to its position. */
1008 /* */
1009 /* If no edge is found, we create and insert a new edge in the */
1010 /* sorted table. Otherwise, we simply add the segment to the edge's */
1011 /* list which is then processed in the second step to compute the */
1012 /* edge's properties. */
1013 /* */
1014 /* Note that the edges table is sorted along the segment/edge */
1015 /* position. */
1016 /* */
1017 /*********************************************************************/
1018
1019 edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
1020 scale );
1021 if ( edge_distance_threshold > 64 / 4 )
1022 edge_distance_threshold = FT_DivFix( 64 / 4, scale );
1023 else
1024 edge_distance_threshold = laxis->edge_distance_threshold;
1025
1026 for ( seg = segments; seg < segment_limit; seg++ )
1027 {
1028 AF_Edge found = NULL;
1029 FT_Pos best = 0xFFFFU;
1030 FT_Int ee;
1031
1032
1033 /* look for an edge corresponding to the segment */
1034 for ( ee = 0; ee < axis->num_edges; ee++ )
1035 {
1036 AF_Edge edge = axis->edges + ee;
1037 FT_Pos dist;
1038
1039
1040 if ( edge->dir != seg->dir )
1041 continue;
1042
1043 dist = seg->pos - edge->fpos;
1044 if ( dist < 0 )
1045 dist = -dist;
1046
1047 if ( dist < edge_distance_threshold && dist < best )
1048 {
1049 AF_Segment link = seg->link;
1050
1051
1052 /* check whether all linked segments of the candidate edge */
1053 /* can make a single edge. */
1054 if ( link )
1055 {
1056 AF_Segment seg1 = edge->first;
1057 FT_Pos dist2 = 0;
1058
1059
1060 do
1061 {
1062 AF_Segment link1 = seg1->link;
1063
1064
1065 if ( link1 )
1066 {
1067 dist2 = AF_SEGMENT_DIST( link, link1 );
1068 if ( dist2 >= edge_distance_threshold )
1069 break;
1070 }
1071
1072 } while ( ( seg1 = seg1->edge_next ) != edge->first );
1073
1074 if ( dist2 >= edge_distance_threshold )
1075 continue;
1076 }
1077
1078 best = dist;
1079 found = edge;
1080 }
1081 }
1082
1083 if ( !found )
1084 {
1085 AF_Edge edge;
1086
1087
1088 /* insert a new edge in the list and */
1089 /* sort according to the position */
1090 error = af_axis_hints_new_edge( axis, seg->pos,
1091 (AF_Direction)seg->dir, 0,
1092 memory, &edge );
1093 if ( error )
1094 goto Exit;
1095
1096 /* add the segment to the new edge's list */
1097 FT_ZERO( edge );
1098
1099 edge->first = seg;
1100 edge->last = seg;
1101 edge->dir = seg->dir;
1102 edge->fpos = seg->pos;
1103 edge->opos = FT_MulFix( seg->pos, scale );
1104 edge->pos = edge->opos;
1105 seg->edge_next = seg;
1106 }
1107 else
1108 {
1109 /* if an edge was found, simply add the segment to the edge's */
1110 /* list */
1111 seg->edge_next = found->first;
1112 found->last->edge_next = seg;
1113 found->last = seg;
1114 }
1115 }
1116
1117 /******************************************************************/
1118 /* */
1119 /* Good, we now compute each edge's properties according to the */
1120 /* segments found on its position. Basically, these are */
1121 /* */
1122 /* - the edge's main direction */
1123 /* - stem edge, serif edge or both (which defaults to stem then) */
1124 /* - rounded edge, straight or both (which defaults to straight) */
1125 /* - link for edge */
1126 /* */
1127 /******************************************************************/
1128
1129 /* first of all, set the `edge' field in each segment -- this is */
1130 /* required in order to compute edge links */
1131
1132 /*
1133 * Note that removing this loop and setting the `edge' field of each
1134 * segment directly in the code above slows down execution speed for
1135 * some reasons on platforms like the Sun.
1136 */
1137 {
1138 AF_Edge edges = axis->edges;
1139 AF_Edge edge_limit = edges + axis->num_edges;
1140 AF_Edge edge;
1141
1142
1143 for ( edge = edges; edge < edge_limit; edge++ )
1144 {
1145 seg = edge->first;
1146 if ( seg )
1147 do
1148 {
1149 seg->edge = edge;
1150 seg = seg->edge_next;
1151
1152 } while ( seg != edge->first );
1153 }
1154
1155 /* now compute each edge properties */
1156 for ( edge = edges; edge < edge_limit; edge++ )
1157 {
1158 FT_Int is_round = 0; /* does it contain round segments? */
1159 FT_Int is_straight = 0; /* does it contain straight segments? */
1160
1161
1162 seg = edge->first;
1163
1164 do
1165 {
1166 FT_Bool is_serif;
1167
1168
1169 /* check for roundness of segment */
1170 if ( seg->flags & AF_EDGE_ROUND )
1171 is_round++;
1172 else
1173 is_straight++;
1174
1175 /* check for links -- if seg->serif is set, then seg->link must */
1176 /* be ignored */
1177 is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge );
1178
1179 if ( seg->link || is_serif )
1180 {
1181 AF_Edge edge2;
1182 AF_Segment seg2;
1183
1184
1185 edge2 = edge->link;
1186 seg2 = seg->link;
1187
1188 if ( is_serif )
1189 {
1190 seg2 = seg->serif;
1191 edge2 = edge->serif;
1192 }
1193
1194 if ( edge2 )
1195 {
1196 FT_Pos edge_delta;
1197 FT_Pos seg_delta;
1198
1199
1200 edge_delta = edge->fpos - edge2->fpos;
1201 if ( edge_delta < 0 )
1202 edge_delta = -edge_delta;
1203
1204 seg_delta = AF_SEGMENT_DIST( seg, seg2 );
1205
1206 if ( seg_delta < edge_delta )
1207 edge2 = seg2->edge;
1208 }
1209 else
1210 edge2 = seg2->edge;
1211
1212 if ( is_serif )
1213 {
1214 edge->serif = edge2;
1215 edge2->flags |= AF_EDGE_SERIF;
1216 }
1217 else
1218 edge->link = edge2;
1219 }
1220
1221 seg = seg->edge_next;
1222
1223 } while ( seg != edge->first );
1224
1225 /* set the round/straight flags */
1226 edge->flags = AF_EDGE_NORMAL;
1227
1228 if ( is_round > 0 && is_round >= is_straight )
1229 edge->flags |= AF_EDGE_ROUND;
1230
1231 /* get rid of serifs if link is set */
1232 /* XXX: This gets rid of many unpleasant artefacts! */
1233 /* Example: the `c' in cour.pfa at size 13 */
1234
1235 if ( edge->serif && edge->link )
1236 edge->serif = NULL;
1237 }
1238 }
1239
1240 Exit:
1241 return error;
1242 }
1243
1244
1245 /* Detect segments and edges for given dimension. */
1246
1247 static FT_Error
1248 af_cjk_hints_detect_features( AF_GlyphHints hints,
1249 AF_Dimension dim )
1250 {
1251 FT_Error error;
1252
1253
1254 error = af_cjk_hints_compute_segments( hints, dim );
1255 if ( !error )
1256 {
1257 af_cjk_hints_link_segments( hints, dim );
1258
1259 error = af_cjk_hints_compute_edges( hints, dim );
1260 }
1261 return error;
1262 }
1263
1264
1265 /* Compute all edges which lie within blue zones. */
1266
1267 static void
1268 af_cjk_hints_compute_blue_edges( AF_GlyphHints hints,
1269 AF_CJKMetrics metrics,
1270 AF_Dimension dim )
1271 {
1272 AF_AxisHints axis = &hints->axis[dim];
1273 AF_Edge edge = axis->edges;
1274 AF_Edge edge_limit = edge + axis->num_edges;
1275 AF_CJKAxis cjk = &metrics->axis[dim];
1276 FT_Fixed scale = cjk->scale;
1277 FT_Pos best_dist0; /* initial threshold */
1278
1279
1280 /* compute the initial threshold as a fraction of the EM size */
1281 best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
1282
1283 if ( best_dist0 > 64 / 2 ) /* maximum 1/2 pixel */
1284 best_dist0 = 64 / 2;
1285
1286 /* compute which blue zones are active, i.e. have their scaled */
1287 /* size < 3/4 pixels */
1288
1289 /* If the distant between an edge and a blue zone is shorter than */
1290 /* best_dist0, set the blue zone for the edge. Then search for */
1291 /* the blue zone with the smallest best_dist to the edge. */
1292
1293 for ( ; edge < edge_limit; edge++ )
1294 {
1295 FT_UInt bb;
1296 AF_Width best_blue = NULL;
1297 FT_Pos best_dist = best_dist0;
1298
1299
1300 for ( bb = 0; bb < cjk->blue_count; bb++ )
1301 {
1302 AF_CJKBlue blue = cjk->blues + bb;
1303 FT_Bool is_top_right_blue, is_major_dir;
1304
1305
1306 /* skip inactive blue zones (i.e., those that are too small) */
1307 if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) )
1308 continue;
1309
1310 /* if it is a top zone, check for right edges -- if it is a bottom */
1311 /* zone, check for left edges */
1312 /* */
1313 /* of course, that's for TrueType */
1314 is_top_right_blue =
1315 (FT_Byte)( ( blue->flags & AF_CJK_BLUE_TOP ) != 0 );
1316 is_major_dir =
1317 FT_BOOL( edge->dir == axis->major_dir );
1318
1319 /* if it is a top zone, the edge must be against the major */
1320 /* direction; if it is a bottom zone, it must be in the major */
1321 /* direction */
1322 if ( is_top_right_blue ^ is_major_dir )
1323 {
1324 FT_Pos dist;
1325 AF_Width compare;
1326
1327
1328 /* Compare the edge to the closest blue zone type */
1329 if ( FT_ABS( edge->fpos - blue->ref.org ) >
1330 FT_ABS( edge->fpos - blue->shoot.org ) )
1331 compare = &blue->shoot;
1332 else
1333 compare = &blue->ref;
1334
1335 dist = edge->fpos - compare->org;
1336 if ( dist < 0 )
1337 dist = -dist;
1338
1339 dist = FT_MulFix( dist, scale );
1340 if ( dist < best_dist )
1341 {
1342 best_dist = dist;
1343 best_blue = compare;
1344 }
1345 }
1346 }
1347
1348 if ( best_blue )
1349 edge->blue_edge = best_blue;
1350 }
1351 }
1352
1353
1354 /* Initalize hinting engine. */
1355
1356 FT_LOCAL_DEF( FT_Error )
1357 af_cjk_hints_init( AF_GlyphHints hints,
1358 AF_CJKMetrics metrics )
1359 {
1360 FT_Render_Mode mode;
1361 FT_UInt32 scaler_flags, other_flags;
1362
1363
1364 af_glyph_hints_rescale( hints, (AF_StyleMetrics)metrics );
1365
1366 /*
1367 * correct x_scale and y_scale when needed, since they may have
1368 * been modified af_cjk_scale_dim above
1369 */
1370 hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
1371 hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
1372 hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
1373 hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
1374
1375 /* compute flags depending on render mode, etc. */
1376 mode = metrics->root.scaler.render_mode;
1377
1378 #if 0 /* AF_CONFIG_OPTION_USE_WARPER */
1379 if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
1380 metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
1381 #endif
1382
1383 scaler_flags = hints->scaler_flags;
1384 other_flags = 0;
1385
1386 /*
1387 * We snap the width of vertical stems for the monochrome and
1388 * horizontal LCD rendering targets only.
1389 */
1390 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
1391 other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
1392
1393 /*
1394 * We snap the width of horizontal stems for the monochrome and
1395 * vertical LCD rendering targets only.
1396 */
1397 if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
1398 other_flags |= AF_LATIN_HINTS_VERT_SNAP;
1399
1400 /*
1401 * We adjust stems to full pixels unless in `light' or `lcd' mode.
1402 */
1403 if ( mode != FT_RENDER_MODE_LIGHT && mode != FT_RENDER_MODE_LCD )
1404 other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
1405
1406 if ( mode == FT_RENDER_MODE_MONO )
1407 other_flags |= AF_LATIN_HINTS_MONO;
1408
1409 scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE;
1410
1411 #ifdef AF_CONFIG_OPTION_USE_WARPER
1412 /* get (global) warper flag */
1413 if ( !metrics->root.globals->module->warping )
1414 scaler_flags |= AF_SCALER_FLAG_NO_WARPER;
1415 #endif
1416
1417 hints->scaler_flags = scaler_flags;
1418 hints->other_flags = other_flags;
1419
1420 return FT_Err_Ok;
1421 }
1422
1423
1424 /*************************************************************************/
1425 /*************************************************************************/
1426 /***** *****/
1427 /***** C J K G L Y P H G R I D - F I T T I N G *****/
1428 /***** *****/
1429 /*************************************************************************/
1430 /*************************************************************************/
1431
1432 /* Snap a given width in scaled coordinates to one of the */
1433 /* current standard widths. */
1434
1435 static FT_Pos
1436 af_cjk_snap_width( AF_Width widths,
1437 FT_UInt count,
1438 FT_Pos width )
1439 {
1440 FT_UInt n;
1441 FT_Pos best = 64 + 32 + 2;
1442 FT_Pos reference = width;
1443 FT_Pos scaled;
1444
1445
1446 for ( n = 0; n < count; n++ )
1447 {
1448 FT_Pos w;
1449 FT_Pos dist;
1450
1451
1452 w = widths[n].cur;
1453 dist = width - w;
1454 if ( dist < 0 )
1455 dist = -dist;
1456 if ( dist < best )
1457 {
1458 best = dist;
1459 reference = w;
1460 }
1461 }
1462
1463 scaled = FT_PIX_ROUND( reference );
1464
1465 if ( width >= reference )
1466 {
1467 if ( width < scaled + 48 )
1468 width = reference;
1469 }
1470 else
1471 {
1472 if ( width > scaled - 48 )
1473 width = reference;
1474 }
1475
1476 return width;
1477 }
1478
1479
1480 /* Compute the snapped width of a given stem. */
1481 /* There is a lot of voodoo in this function; changing the hard-coded */
1482 /* parameters influence the whole hinting process. */
1483
1484 static FT_Pos
1485 af_cjk_compute_stem_width( AF_GlyphHints hints,
1486 AF_Dimension dim,
1487 FT_Pos width,
1488 FT_UInt base_flags,
1489 FT_UInt stem_flags )
1490 {
1491 AF_CJKMetrics metrics = (AF_CJKMetrics)hints->metrics;
1492 AF_CJKAxis axis = &metrics->axis[dim];
1493 FT_Pos dist = width;
1494 FT_Int sign = 0;
1495 FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT );
1496
1497 FT_UNUSED( base_flags );
1498 FT_UNUSED( stem_flags );
1499
1500
1501 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
1502 return width;
1503
1504 if ( dist < 0 )
1505 {
1506 dist = -width;
1507 sign = 1;
1508 }
1509
1510 if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
1511 ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
1512 {
1513 /* smooth hinting process: very lightly quantize the stem width */
1514
1515 if ( axis->width_count > 0 )
1516 {
1517 if ( FT_ABS( dist - axis->widths[0].cur ) < 40 )
1518 {
1519 dist = axis->widths[0].cur;
1520 if ( dist < 48 )
1521 dist = 48;
1522
1523 goto Done_Width;
1524 }
1525 }
1526
1527 if ( dist < 54 )
1528 dist += ( 54 - dist ) / 2;
1529 else if ( dist < 3 * 64 )
1530 {
1531 FT_Pos delta;
1532
1533
1534 delta = dist & 63;
1535 dist &= -64;
1536
1537 if ( delta < 10 )
1538 dist += delta;
1539 else if ( delta < 22 )
1540 dist += 10;
1541 else if ( delta < 42 )
1542 dist += delta;
1543 else if ( delta < 54 )
1544 dist += 54;
1545 else
1546 dist += delta;
1547 }
1548 }
1549 else
1550 {
1551 /* strong hinting process: snap the stem width to integer pixels */
1552
1553 dist = af_cjk_snap_width( axis->widths, axis->width_count, dist );
1554
1555 if ( vertical )
1556 {
1557 /* in the case of vertical hinting, always round */
1558 /* the stem heights to integer pixels */
1559
1560 if ( dist >= 64 )
1561 dist = ( dist + 16 ) & ~63;
1562 else
1563 dist = 64;
1564 }
1565 else
1566 {
1567 if ( AF_LATIN_HINTS_DO_MONO( hints ) )
1568 {
1569 /* monochrome horizontal hinting: snap widths to integer pixels */
1570 /* with a different threshold */
1571
1572 if ( dist < 64 )
1573 dist = 64;
1574 else
1575 dist = ( dist + 32 ) & ~63;
1576 }
1577 else
1578 {
1579 /* for horizontal anti-aliased hinting, we adopt a more subtle */
1580 /* approach: we strengthen small stems, round stems whose size */
1581 /* is between 1 and 2 pixels to an integer, otherwise nothing */
1582
1583 if ( dist < 48 )
1584 dist = ( dist + 64 ) >> 1;
1585
1586 else if ( dist < 128 )
1587 dist = ( dist + 22 ) & ~63;
1588 else
1589 /* round otherwise to prevent color fringes in LCD mode */
1590 dist = ( dist + 32 ) & ~63;
1591 }
1592 }
1593 }
1594
1595 Done_Width:
1596 if ( sign )
1597 dist = -dist;
1598
1599 return dist;
1600 }
1601
1602
1603 /* Align one stem edge relative to the previous stem edge. */
1604
1605 static void
1606 af_cjk_align_linked_edge( AF_GlyphHints hints,
1607 AF_Dimension dim,
1608 AF_Edge base_edge,
1609 AF_Edge stem_edge )
1610 {
1611 FT_Pos dist = stem_edge->opos - base_edge->opos;
1612
1613 FT_Pos fitted_width = af_cjk_compute_stem_width( hints, dim, dist,
1614 base_edge->flags,
1615 stem_edge->flags );
1616
1617
1618 stem_edge->pos = base_edge->pos + fitted_width;
1619
1620 FT_TRACE5(( " CJKLINK: edge %d @%d (opos=%.2f) linked to %.2f,"
1621 " dist was %.2f, now %.2f\n",
1622 stem_edge - hints->axis[dim].edges, stem_edge->fpos,
1623 stem_edge->opos / 64.0, stem_edge->pos / 64.0,
1624 dist / 64.0, fitted_width / 64.0 ));
1625 }
1626
1627
1628 /* Shift the coordinates of the `serif' edge by the same amount */
1629 /* as the corresponding `base' edge has been moved already. */
1630
1631 static void
1632 af_cjk_align_serif_edge( AF_GlyphHints hints,
1633 AF_Edge base,
1634 AF_Edge serif )
1635 {
1636 FT_UNUSED( hints );
1637
1638 serif->pos = base->pos + ( serif->opos - base->opos );
1639 }
1640
1641
1642 /*************************************************************************/
1643 /*************************************************************************/
1644 /*************************************************************************/
1645 /**** ****/
1646 /**** E D G E H I N T I N G ****/
1647 /**** ****/
1648 /*************************************************************************/
1649 /*************************************************************************/
1650 /*************************************************************************/
1651
1652
1653 #define AF_LIGHT_MODE_MAX_HORZ_GAP 9
1654 #define AF_LIGHT_MODE_MAX_VERT_GAP 15
1655 #define AF_LIGHT_MODE_MAX_DELTA_ABS 14
1656
1657
1658 static FT_Pos
1659 af_hint_normal_stem( AF_GlyphHints hints,
1660 AF_Edge edge,
1661 AF_Edge edge2,
1662 FT_Pos anchor,
1663 AF_Dimension dim )
1664 {
1665 FT_Pos org_len, cur_len, org_center;
1666 FT_Pos cur_pos1, cur_pos2;
1667 FT_Pos d_off1, u_off1, d_off2, u_off2, delta;
1668 FT_Pos offset;
1669 FT_Pos threshold = 64;
1670
1671
1672 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
1673 {
1674 if ( ( edge->flags & AF_EDGE_ROUND ) &&
1675 ( edge2->flags & AF_EDGE_ROUND ) )
1676 {
1677 if ( dim == AF_DIMENSION_VERT )
1678 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP;
1679 else
1680 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP;
1681 }
1682 else
1683 {
1684 if ( dim == AF_DIMENSION_VERT )
1685 threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3;
1686 else
1687 threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3;
1688 }
1689 }
1690
1691 org_len = edge2->opos - edge->opos;
1692 cur_len = af_cjk_compute_stem_width( hints, dim, org_len,
1693 edge->flags,
1694 edge2->flags );
1695
1696 org_center = ( edge->opos + edge2->opos ) / 2 + anchor;
1697 cur_pos1 = org_center - cur_len / 2;
1698 cur_pos2 = cur_pos1 + cur_len;
1699 d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 );
1700 d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 );
1701 u_off1 = 64 - d_off1;
1702 u_off2 = 64 - d_off2;
1703 delta = 0;
1704
1705
1706 if ( d_off1 == 0 || d_off2 == 0 )
1707 goto Exit;
1708
1709 if ( cur_len <= threshold )
1710 {
1711 if ( d_off2 < cur_len )
1712 {
1713 if ( u_off1 <= d_off2 )
1714 delta = u_off1;
1715 else
1716 delta = -d_off2;
1717 }
1718
1719 goto Exit;
1720 }
1721
1722 if ( threshold < 64 )
1723 {
1724 if ( d_off1 >= threshold || u_off1 >= threshold ||
1725 d_off2 >= threshold || u_off2 >= threshold )
1726 goto Exit;
1727 }
1728
1729 offset = cur_len & 63;
1730
1731 if ( offset < 32 )
1732 {
1733 if ( u_off1 <= offset || d_off2 <= offset )
1734 goto Exit;
1735 }
1736 else
1737 offset = 64 - threshold;
1738
1739 d_off1 = threshold - u_off1;
1740 u_off1 = u_off1 - offset;
1741 u_off2 = threshold - d_off2;
1742 d_off2 = d_off2 - offset;
1743
1744 if ( d_off1 <= u_off1 )
1745 u_off1 = -d_off1;
1746
1747 if ( d_off2 <= u_off2 )
1748 u_off2 = -d_off2;
1749
1750 if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) )
1751 delta = u_off1;
1752 else
1753 delta = u_off2;
1754
1755 Exit:
1756
1757 #if 1
1758 if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
1759 {
1760 if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS )
1761 delta = AF_LIGHT_MODE_MAX_DELTA_ABS;
1762 else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS )
1763 delta = -AF_LIGHT_MODE_MAX_DELTA_ABS;
1764 }
1765 #endif
1766
1767 cur_pos1 += delta;
1768
1769 if ( edge->opos < edge2->opos )
1770 {
1771 edge->pos = cur_pos1;
1772 edge2->pos = cur_pos1 + cur_len;
1773 }
1774 else
1775 {
1776 edge->pos = cur_pos1 + cur_len;
1777 edge2->pos = cur_pos1;
1778 }
1779
1780 return delta;
1781 }
1782
1783
1784 /* The main grid-fitting routine. */
1785
1786 static void
1787 af_cjk_hint_edges( AF_GlyphHints hints,
1788 AF_Dimension dim )
1789 {
1790 AF_AxisHints axis = &hints->axis[dim];
1791 AF_Edge edges = axis->edges;
1792 AF_Edge edge_limit = edges + axis->num_edges;
1793 FT_PtrDist n_edges;
1794 AF_Edge edge;
1795 AF_Edge anchor = NULL;
1796 FT_Pos delta = 0;
1797 FT_Int skipped = 0;
1798 FT_Bool has_last_stem = FALSE;
1799 FT_Pos last_stem_pos = 0;
1800
1801 #ifdef FT_DEBUG_LEVEL_TRACE
1802 FT_UInt num_actions = 0;
1803 #endif
1804
1805
1806 FT_TRACE5(( "cjk %s edge hinting (style `%s')\n",
1807 dim == AF_DIMENSION_VERT ? "horizontal" : "vertical",
1808 af_style_names[hints->metrics->style_class->style] ));
1809
1810 /* we begin by aligning all stems relative to the blue zone */
1811
1812 if ( AF_HINTS_DO_BLUES( hints ) )
1813 {
1814 for ( edge = edges; edge < edge_limit; edge++ )
1815 {
1816 AF_Width blue;
1817 AF_Edge edge1, edge2;
1818
1819
1820 if ( edge->flags & AF_EDGE_DONE )
1821 continue;
1822
1823 blue = edge->blue_edge;
1824 edge1 = NULL;
1825 edge2 = edge->link;
1826
1827 if ( blue )
1828 {
1829 edge1 = edge;
1830 }
1831 else if ( edge2 && edge2->blue_edge )
1832 {
1833 blue = edge2->blue_edge;
1834 edge1 = edge2;
1835 edge2 = edge;
1836 }
1837
1838 if ( !edge1 )
1839 continue;
1840
1841 #ifdef FT_DEBUG_LEVEL_TRACE
1842 FT_TRACE5(( " CJKBLUE: edge %d @%d (opos=%.2f) snapped to %.2f,"
1843 " was %.2f\n",
1844 edge1 - edges, edge1->fpos, edge1->opos / 64.0,
1845 blue->fit / 64.0, edge1->pos / 64.0 ));
1846
1847 num_actions++;
1848 #endif
1849
1850 edge1->pos = blue->fit;
1851 edge1->flags |= AF_EDGE_DONE;
1852
1853 if ( edge2 && !edge2->blue_edge )
1854 {
1855 af_cjk_align_linked_edge( hints, dim, edge1, edge2 );
1856 edge2->flags |= AF_EDGE_DONE;
1857
1858 #ifdef FT_DEBUG_LEVEL_TRACE
1859 num_actions++;
1860 #endif
1861 }
1862
1863 if ( !anchor )
1864 anchor = edge;
1865 }
1866 }
1867
1868 /* now we align all stem edges. */
1869 for ( edge = edges; edge < edge_limit; edge++ )
1870 {
1871 AF_Edge edge2;
1872
1873
1874 if ( edge->flags & AF_EDGE_DONE )
1875 continue;
1876
1877 /* skip all non-stem edges */
1878 edge2 = edge->link;
1879 if ( !edge2 )
1880 {
1881 skipped++;
1882 continue;
1883 }
1884
1885 /* Some CJK characters have so many stems that
1886 * the hinter is likely to merge two adjacent ones.
1887 * To solve this problem, if either edge of a stem
1888 * is too close to the previous one, we avoid
1889 * aligning the two edges, but rather interpolate
1890 * their locations at the end of this function in
1891 * order to preserve the space between the stems.
1892 */
1893 if ( has_last_stem &&
1894 ( edge->pos < last_stem_pos + 64 ||
1895 edge2->pos < last_stem_pos + 64 ) )
1896 {
1897 skipped++;
1898 continue;
1899 }
1900
1901 /* now align the stem */
1902
1903 /* this should not happen, but it's better to be safe */
1904 if ( edge2->blue_edge )
1905 {
1906 FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges ));
1907
1908 af_cjk_align_linked_edge( hints, dim, edge2, edge );
1909 edge->flags |= AF_EDGE_DONE;
1910
1911 #ifdef FT_DEBUG_LEVEL_TRACE
1912 num_actions++;
1913 #endif
1914
1915 continue;
1916 }
1917
1918 if ( edge2 < edge )
1919 {
1920 af_cjk_align_linked_edge( hints, dim, edge2, edge );
1921 edge->flags |= AF_EDGE_DONE;
1922
1923 #ifdef FT_DEBUG_LEVEL_TRACE
1924 num_actions++;
1925 #endif
1926
1927 /* We rarely reaches here it seems;
1928 * usually the two edges belonging
1929 * to one stem are marked as DONE together
1930 */
1931 has_last_stem = TRUE;
1932 last_stem_pos = edge->pos;
1933 continue;
1934 }
1935
1936 if ( dim != AF_DIMENSION_VERT && !anchor )
1937 {
1938
1939 #if 0
1940 if ( fixedpitch )
1941 {
1942 AF_Edge left = edge;
1943 AF_Edge right = edge_limit - 1;
1944 AF_EdgeRec left1, left2, right1, right2;
1945 FT_Pos target, center1, center2;
1946 FT_Pos delta1, delta2, d1, d2;
1947
1948
1949 while ( right > left && !right->link )
1950 right--;
1951
1952 left1 = *left;
1953 left2 = *left->link;
1954 right1 = *right->link;
1955 right2 = *right;
1956
1957 delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2;
1958 target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16;
1959
1960 delta1 = delta;
1961 delta1 += af_hint_normal_stem( hints, left, left->link,
1962 delta1, 0 );
1963
1964 if ( left->link != right )
1965 af_hint_normal_stem( hints, right->link, right, delta1, 0 );
1966
1967 center1 = left->pos + ( right->pos - left->pos ) / 2;
1968
1969 if ( center1 >= target )
1970 delta2 = delta - 32;
1971 else
1972 delta2 = delta + 32;
1973
1974 delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 );
1975
1976 if ( delta1 != delta2 )
1977 {
1978 if ( left->link != right )
1979 af_hint_normal_stem( hints, &right1, &right2, delta2, 0 );
1980
1981 center2 = left1.pos + ( right2.pos - left1.pos ) / 2;
1982
1983 d1 = center1 - target;
1984 d2 = center2 - target;
1985
1986 if ( FT_ABS( d2 ) < FT_ABS( d1 ) )
1987 {
1988 left->pos = left1.pos;
1989 left->link->pos = left2.pos;
1990
1991 if ( left->link != right )
1992 {
1993 right->link->pos = right1.pos;
1994 right->pos = right2.pos;
1995 }
1996
1997 delta1 = delta2;
1998 }
1999 }
2000
2001 delta = delta1;
2002 right->link->flags |= AF_EDGE_DONE;
2003 right->flags |= AF_EDGE_DONE;
2004 }
2005 else
2006
2007 #endif /* 0 */
2008
2009 delta = af_hint_normal_stem( hints, edge, edge2, 0,
2010 AF_DIMENSION_HORZ );
2011 }
2012 else
2013 af_hint_normal_stem( hints, edge, edge2, delta, dim );
2014
2015 #if 0
2016 printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n",
2017 edge - edges, edge2 - edges,
2018 ( edge->pos - edge->opos ) / 64.0,
2019 ( edge2->pos - edge2->opos ) / 64.0 );
2020 #endif
2021
2022 anchor = edge;
2023 edge->flags |= AF_EDGE_DONE;
2024 edge2->flags |= AF_EDGE_DONE;
2025 has_last_stem = TRUE;
2026 last_stem_pos = edge2->pos;
2027 }
2028
2029 /* make sure that lowercase m's maintain their symmetry */
2030
2031 /* In general, lowercase m's have six vertical edges if they are sans */
2032 /* serif, or twelve if they are with serifs. This implementation is */
2033 /* based on that assumption, and seems to work very well with most */
2034 /* faces. However, if for a certain face this assumption is not */
2035 /* true, the m is just rendered like before. In addition, any stem */
2036 /* correction will only be applied to symmetrical glyphs (even if the */
2037 /* glyph is not an m), so the potential for unwanted distortion is */
2038 /* relatively low. */
2039
2040 /* We don't handle horizontal edges since we can't easily assure that */
2041 /* the third (lowest) stem aligns with the base line; it might end up */
2042 /* one pixel higher or lower. */
2043
2044 n_edges = edge_limit - edges;
2045 if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
2046 {
2047 AF_Edge edge1, edge2, edge3;
2048 FT_Pos dist1, dist2, span;
2049
2050
2051 if ( n_edges == 6 )
2052 {
2053 edge1 = edges;
2054 edge2 = edges + 2;
2055 edge3 = edges + 4;
2056 }
2057 else
2058 {
2059 edge1 = edges + 1;
2060 edge2 = edges + 5;
2061 edge3 = edges + 9;
2062 }
2063
2064 dist1 = edge2->opos - edge1->opos;
2065 dist2 = edge3->opos - edge2->opos;
2066
2067 span = dist1 - dist2;
2068 if ( span < 0 )
2069 span = -span;
2070
2071 if ( edge1->link == edge1 + 1 &&
2072 edge2->link == edge2 + 1 &&
2073 edge3->link == edge3 + 1 && span < 8 )
2074 {
2075 delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
2076 edge3->pos -= delta;
2077 if ( edge3->link )
2078 edge3->link->pos -= delta;
2079
2080 /* move the serifs along with the stem */
2081 if ( n_edges == 12 )
2082 {
2083 ( edges + 8 )->pos -= delta;
2084 ( edges + 11 )->pos -= delta;
2085 }
2086
2087 edge3->flags |= AF_EDGE_DONE;
2088 if ( edge3->link )
2089 edge3->link->flags |= AF_EDGE_DONE;
2090 }
2091 }
2092
2093 if ( !skipped )
2094 goto Exit;
2095
2096 /*
2097 * now hint the remaining edges (serifs and single) in order
2098 * to complete our processing
2099 */
2100 for ( edge = edges; edge < edge_limit; edge++ )
2101 {
2102 if ( edge->flags & AF_EDGE_DONE )
2103 continue;
2104
2105 if ( edge->serif )
2106 {
2107 af_cjk_align_serif_edge( hints, edge->serif, edge );
2108 edge->flags |= AF_EDGE_DONE;
2109 skipped--;
2110 }
2111 }
2112
2113 if ( !skipped )
2114 goto Exit;
2115
2116 for ( edge = edges; edge < edge_limit; edge++ )
2117 {
2118 AF_Edge before, after;
2119
2120
2121 if ( edge->flags & AF_EDGE_DONE )
2122 continue;
2123
2124 before = after = edge;
2125
2126 while ( --before >= edges )
2127 if ( before->flags & AF_EDGE_DONE )
2128 break;
2129
2130 while ( ++after < edge_limit )
2131 if ( after->flags & AF_EDGE_DONE )
2132 break;
2133
2134 if ( before >= edges || after < edge_limit )
2135 {
2136 if ( before < edges )
2137 af_cjk_align_serif_edge( hints, after, edge );
2138 else if ( after >= edge_limit )
2139 af_cjk_align_serif_edge( hints, before, edge );
2140 else
2141 {
2142 if ( after->fpos == before->fpos )
2143 edge->pos = before->pos;
2144 else
2145 edge->pos = before->pos +
2146 FT_MulDiv( edge->fpos - before->fpos,
2147 after->pos - before->pos,
2148 after->fpos - before->fpos );
2149 }
2150 }
2151 }
2152
2153 Exit:
2154
2155 #ifdef FT_DEBUG_LEVEL_TRACE
2156 if ( !num_actions )
2157 FT_TRACE5(( " (none)\n" ));
2158 FT_TRACE5(( "\n" ));
2159 #endif
2160
2161 return;
2162 }
2163
2164
2165 static void
2166 af_cjk_align_edge_points( AF_GlyphHints hints,
2167 AF_Dimension dim )
2168 {
2169 AF_AxisHints axis = & hints->axis[dim];
2170 AF_Edge edges = axis->edges;
2171 AF_Edge edge_limit = edges + axis->num_edges;
2172 AF_Edge edge;
2173 FT_Bool snapping;
2174
2175
2176 snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ &&
2177 AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ||
2178 ( dim == AF_DIMENSION_VERT &&
2179 AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) );
2180
2181 for ( edge = edges; edge < edge_limit; edge++ )
2182 {
2183 /* move the points of each segment */
2184 /* in each edge to the edge's position */
2185 AF_Segment seg = edge->first;
2186
2187
2188 if ( snapping )
2189 {
2190 do
2191 {
2192 AF_Point point = seg->first;
2193
2194
2195 for (;;)
2196 {
2197 if ( dim == AF_DIMENSION_HORZ )
2198 {
2199 point->x = edge->pos;
2200 point->flags |= AF_FLAG_TOUCH_X;
2201 }
2202 else
2203 {
2204 point->y = edge->pos;
2205 point->flags |= AF_FLAG_TOUCH_Y;
2206 }
2207
2208 if ( point == seg->last )
2209 break;
2210
2211 point = point->next;
2212 }
2213
2214 seg = seg->edge_next;
2215
2216 } while ( seg != edge->first );
2217 }
2218 else
2219 {
2220 FT_Pos delta = edge->pos - edge->opos;
2221
2222
2223 do
2224 {
2225 AF_Point point = seg->first;
2226
2227
2228 for (;;)
2229 {
2230 if ( dim == AF_DIMENSION_HORZ )
2231 {
2232 point->x += delta;
2233 point->flags |= AF_FLAG_TOUCH_X;
2234 }
2235 else
2236 {
2237 point->y += delta;
2238 point->flags |= AF_FLAG_TOUCH_Y;
2239 }
2240
2241 if ( point == seg->last )
2242 break;
2243
2244 point = point->next;
2245 }
2246
2247 seg = seg->edge_next;
2248
2249 } while ( seg != edge->first );
2250 }
2251 }
2252 }
2253
2254
2255 /* Apply the complete hinting algorithm to a CJK glyph. */
2256
2257 FT_LOCAL_DEF( FT_Error )
2258 af_cjk_hints_apply( FT_UInt glyph_index,
2259 AF_GlyphHints hints,
2260 FT_Outline* outline,
2261 AF_CJKMetrics metrics )
2262 {
2263 FT_Error error;
2264 int dim;
2265
2266 FT_UNUSED( metrics );
2267 FT_UNUSED( glyph_index );
2268
2269
2270 error = af_glyph_hints_reload( hints, outline );
2271 if ( error )
2272 goto Exit;
2273
2274 /* analyze glyph outline */
2275 if ( AF_HINTS_DO_HORIZONTAL( hints ) )
2276 {
2277 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );
2278 if ( error )
2279 goto Exit;
2280
2281 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_HORZ );
2282 }
2283
2284 if ( AF_HINTS_DO_VERTICAL( hints ) )
2285 {
2286 error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );
2287 if ( error )
2288 goto Exit;
2289
2290 af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_VERT );
2291 }
2292
2293 /* grid-fit the outline */
2294 for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
2295 {
2296 if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
2297 ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
2298 {
2299
2300 #ifdef AF_CONFIG_OPTION_USE_WARPER
2301 if ( dim == AF_DIMENSION_HORZ &&
2302 metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL &&
2303 AF_HINTS_DO_WARP( hints ) )
2304 {
2305 AF_WarperRec warper;
2306 FT_Fixed scale;
2307 FT_Pos delta;
2308
2309
2310 af_warper_compute( &warper, hints, (AF_Dimension)dim,
2311 &scale, &delta );
2312 af_glyph_hints_scale_dim( hints, (AF_Dimension)dim,
2313 scale, delta );
2314 continue;
2315 }
2316 #endif /* AF_CONFIG_OPTION_USE_WARPER */
2317
2318 af_cjk_hint_edges( hints, (AF_Dimension)dim );
2319 af_cjk_align_edge_points( hints, (AF_Dimension)dim );
2320 af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
2321 af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
2322 }
2323 }
2324
2325 af_glyph_hints_save( hints, outline );
2326
2327 Exit:
2328 return error;
2329 }
2330
2331
2332 /*************************************************************************/
2333 /*************************************************************************/
2334 /***** *****/
2335 /***** C J K S C R I P T C L A S S *****/
2336 /***** *****/
2337 /*************************************************************************/
2338 /*************************************************************************/
2339
2340
2341 AF_DEFINE_WRITING_SYSTEM_CLASS(
2342 af_cjk_writing_system_class,
2343
2344 AF_WRITING_SYSTEM_CJK,
2345
2346 sizeof ( AF_CJKMetricsRec ),
2347
2348 (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init, /* style_metrics_init */
2349 (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale, /* style_metrics_scale */
2350 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
2351 (AF_WritingSystem_GetStdWidthsFunc)af_cjk_get_standard_widths, /* style_metrics_getstdw */
2352
2353 (AF_WritingSystem_InitHintsFunc) af_cjk_hints_init, /* style_hints_init */
2354 (AF_WritingSystem_ApplyHintsFunc) af_cjk_hints_apply /* style_hints_apply */
2355 )
2356
2357
2358 #else /* !AF_CONFIG_OPTION_CJK */
2359
2360
2361 AF_DEFINE_WRITING_SYSTEM_CLASS(
2362 af_cjk_writing_system_class,
2363
2364 AF_WRITING_SYSTEM_CJK,
2365
2366 sizeof ( AF_CJKMetricsRec ),
2367
2368 (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init */
2369 (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale */
2370 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
2371 (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */
2372
2373 (AF_WritingSystem_InitHintsFunc) NULL, /* style_hints_init */
2374 (AF_WritingSystem_ApplyHintsFunc) NULL /* style_hints_apply */
2375 )
2376
2377
2378 #endif /* !AF_CONFIG_OPTION_CJK */
2379
2380
2381 /* END */