1
/***************************************************************************/
5
/* Auto-fitter hinting routines for CJK script (body). */
7
/* Copyright 2006, 2007, 2008, 2009, 2010 by */
8
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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. */
16
/***************************************************************************/
19
* The algorithm is based on akito's autohint patch, available here:
21
* http://www.kde.gr.jp/~akito/patch/freetype2/
29
#ifdef AF_CONFIG_OPTION_CJK
40
/*************************************************************************/
41
/*************************************************************************/
43
/***** C J K G L O B A L M E T R I C S *****/
45
/*************************************************************************/
46
/*************************************************************************/
48
FT_LOCAL_DEF( FT_Error )
49
af_cjk_metrics_init( AF_LatinMetrics metrics,
52
FT_CharMap oldmap = face->charmap;
55
metrics->units_per_em = face->units_per_EM;
57
/* TODO are there blues? */
59
if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
63
/* latin's version would suffice */
64
af_latin_metrics_init_widths( metrics, face, 0x7530 );
65
af_latin_metrics_check_digits( metrics, face );
68
FT_Set_Charmap( face, oldmap );
75
af_cjk_metrics_scale_dim( AF_LatinMetrics metrics,
82
axis = &metrics->axis[dim];
84
if ( dim == AF_DIMENSION_HORZ )
86
axis->scale = scaler->x_scale;
87
axis->delta = scaler->x_delta;
91
axis->scale = scaler->y_scale;
92
axis->delta = scaler->y_delta;
98
af_cjk_metrics_scale( AF_LatinMetrics metrics,
101
metrics->root.scaler = *scaler;
103
af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
104
af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
108
/*************************************************************************/
109
/*************************************************************************/
111
/***** C J K G L Y P H A N A L Y S I S *****/
113
/*************************************************************************/
114
/*************************************************************************/
117
af_cjk_hints_compute_segments( AF_GlyphHints hints,
120
AF_AxisHints axis = &hints->axis[dim];
121
AF_Segment segments = axis->segments;
122
AF_Segment segment_limit = segments + axis->num_segments;
127
error = af_latin_hints_compute_segments( hints, dim );
131
/* a segment is round if it doesn't have successive */
132
/* on-curve points. */
133
for ( seg = segments; seg < segment_limit; seg++ )
135
AF_Point pt = seg->first;
136
AF_Point last = seg->last;
137
AF_Flags f0 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
141
seg->flags &= ~AF_EDGE_ROUND;
143
for ( ; pt != last; f0 = f1 )
146
f1 = (AF_Flags)(pt->flags & AF_FLAG_CONTROL);
152
seg->flags |= AF_EDGE_ROUND;
161
af_cjk_hints_link_segments( AF_GlyphHints hints,
164
AF_AxisHints axis = &hints->axis[dim];
165
AF_Segment segments = axis->segments;
166
AF_Segment segment_limit = segments + axis->num_segments;
167
AF_Direction major_dir = axis->major_dir;
168
AF_Segment seg1, seg2;
169
FT_Pos len_threshold;
170
FT_Pos dist_threshold;
173
len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
175
dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
177
dist_threshold = FT_DivFix( 64 * 3, dist_threshold );
179
/* now compare each segment to the others */
180
for ( seg1 = segments; seg1 < segment_limit; seg1++ )
182
/* the fake segments are for metrics hinting only */
183
if ( seg1->first == seg1->last )
186
if ( seg1->dir != major_dir )
189
for ( seg2 = segments; seg2 < segment_limit; seg2++ )
190
if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 )
192
FT_Pos dist = seg2->pos - seg1->pos;
199
FT_Pos min = seg1->min_coord;
200
FT_Pos max = seg1->max_coord;
204
if ( min < seg2->min_coord )
205
min = seg2->min_coord;
207
if ( max > seg2->max_coord )
208
max = seg2->max_coord;
211
if ( len >= len_threshold )
213
if ( dist * 8 < seg1->score * 9 &&
214
( dist * 8 < seg1->score * 7 || seg1->len < len ) )
221
if ( dist * 8 < seg2->score * 9 &&
222
( dist * 8 < seg2->score * 7 || seg2->len < len ) )
234
* now compute the `serif' segments
236
* In Hanzi, some strokes are wider on one or both of the ends.
237
* We either identify the stems on the ends as serifs or remove
238
* the linkage, depending on the length of the stems.
243
AF_Segment link1, link2;
246
for ( seg1 = segments; seg1 < segment_limit; seg1++ )
249
if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos )
252
if ( seg1->score >= dist_threshold )
255
for ( seg2 = segments; seg2 < segment_limit; seg2++ )
257
if ( seg2->pos > seg1->pos || seg1 == seg2 )
261
if ( !link2 || link2->link != seg2 || link2->pos < link1->pos )
264
if ( seg1->pos == seg2->pos && link1->pos == link2->pos )
267
if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score )
270
/* seg2 < seg1 < link1 < link2 */
272
if ( seg1->len >= seg2->len * 3 )
277
for ( seg = segments; seg < segment_limit; seg++ )
279
AF_Segment link = seg->link;
287
else if ( link == link2 )
296
seg1->link = link1->link = 0;
304
for ( seg1 = segments; seg1 < segment_limit; seg1++ )
311
if ( seg2->link != seg1 )
315
if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 )
316
seg1->serif = seg2->link;
326
af_cjk_hints_compute_edges( AF_GlyphHints hints,
329
AF_AxisHints axis = &hints->axis[dim];
330
FT_Error error = AF_Err_Ok;
331
FT_Memory memory = hints->memory;
332
AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim];
334
AF_Segment segments = axis->segments;
335
AF_Segment segment_limit = segments + axis->num_segments;
339
FT_Pos edge_distance_threshold;
344
scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
347
/*********************************************************************/
349
/* We begin by generating a sorted table of edges for the current */
350
/* direction. To do so, we simply scan each segment and try to find */
351
/* an edge in our table that corresponds to its position. */
353
/* If no edge is found, we create and insert a new edge in the */
354
/* sorted table. Otherwise, we simply add the segment to the edge's */
355
/* list which is then processed in the second step to compute the */
356
/* edge's properties. */
358
/* Note that the edges table is sorted along the segment/edge */
361
/*********************************************************************/
363
edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
365
if ( edge_distance_threshold > 64 / 4 )
366
edge_distance_threshold = FT_DivFix( 64 / 4, scale );
368
edge_distance_threshold = laxis->edge_distance_threshold;
370
for ( seg = segments; seg < segment_limit; seg++ )
373
FT_Pos best = 0xFFFFU;
377
/* look for an edge corresponding to the segment */
378
for ( ee = 0; ee < axis->num_edges; ee++ )
380
AF_Edge edge = axis->edges + ee;
384
if ( edge->dir != seg->dir )
387
dist = seg->pos - edge->fpos;
391
if ( dist < edge_distance_threshold && dist < best )
393
AF_Segment link = seg->link;
396
/* check whether all linked segments of the candidate edge */
397
/* can make a single edge. */
400
AF_Segment seg1 = edge->first;
410
dist2 = AF_SEGMENT_DIST( link, link1 );
411
if ( dist2 >= edge_distance_threshold )
415
} while ( ( seg1 = seg1->edge_next ) != edge->first );
417
if ( dist2 >= edge_distance_threshold )
431
/* insert a new edge in the list and */
432
/* sort according to the position */
433
error = af_axis_hints_new_edge( axis, seg->pos,
434
(AF_Direction)seg->dir,
439
/* add the segment to the new edge's list */
444
edge->fpos = seg->pos;
445
edge->opos = edge->pos = FT_MulFix( seg->pos, scale );
446
seg->edge_next = seg;
447
edge->dir = seg->dir;
451
/* if an edge was found, simply add the segment to the edge's */
453
seg->edge_next = found->first;
454
found->last->edge_next = seg;
459
/*********************************************************************/
461
/* Good, we now compute each edge's properties according to segments */
462
/* found on its position. Basically, these are as follows. */
464
/* - edge's main direction */
465
/* - stem edge, serif edge or both (which defaults to stem then) */
466
/* - rounded edge, straight or both (which defaults to straight) */
467
/* - link for edge */
469
/*********************************************************************/
471
/* first of all, set the `edge' field in each segment -- this is */
472
/* required in order to compute edge links */
474
/* Note that removing this loop and setting the `edge' field of each */
475
/* segment directly in the code above slows down execution speed for */
476
/* some reasons on platforms like the Sun. */
479
AF_Edge edges = axis->edges;
480
AF_Edge edge_limit = edges + axis->num_edges;
484
for ( edge = edges; edge < edge_limit; edge++ )
491
seg = seg->edge_next;
493
} while ( seg != edge->first );
496
/* now compute each edge properties */
497
for ( edge = edges; edge < edge_limit; edge++ )
499
FT_Int is_round = 0; /* does it contain round segments? */
500
FT_Int is_straight = 0; /* does it contain straight segments? */
510
/* check for roundness of segment */
511
if ( seg->flags & AF_EDGE_ROUND )
516
/* check for links -- if seg->serif is set, then seg->link must */
518
is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge );
520
if ( seg->link || is_serif )
541
edge_delta = edge->fpos - edge2->fpos;
542
if ( edge_delta < 0 )
543
edge_delta = -edge_delta;
545
seg_delta = AF_SEGMENT_DIST( seg, seg2 );
547
if ( seg_delta < edge_delta )
556
edge2->flags |= AF_EDGE_SERIF;
562
seg = seg->edge_next;
564
} while ( seg != edge->first );
566
/* set the round/straight flags */
567
edge->flags = AF_EDGE_NORMAL;
569
if ( is_round > 0 && is_round >= is_straight )
570
edge->flags |= AF_EDGE_ROUND;
572
/* get rid of serifs if link is set */
573
/* XXX: This gets rid of many unpleasant artefacts! */
574
/* Example: the `c' in cour.pfa at size 13 */
576
if ( edge->serif && edge->link )
587
af_cjk_hints_detect_features( AF_GlyphHints hints,
593
error = af_cjk_hints_compute_segments( hints, dim );
596
af_cjk_hints_link_segments( hints, dim );
598
error = af_cjk_hints_compute_edges( hints, dim );
604
FT_LOCAL_DEF( FT_Error )
605
af_cjk_hints_init( AF_GlyphHints hints,
606
AF_LatinMetrics metrics )
609
FT_UInt32 scaler_flags, other_flags;
612
af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );
615
* correct x_scale and y_scale when needed, since they may have
616
* been modified af_cjk_scale_dim above
618
hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;
619
hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;
620
hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;
621
hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;
623
/* compute flags depending on render mode, etc. */
624
mode = metrics->root.scaler.render_mode;
627
if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
628
metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
631
scaler_flags = hints->scaler_flags;
635
* We snap the width of vertical stems for the monochrome and
636
* horizontal LCD rendering targets only.
638
if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )
639
other_flags |= AF_LATIN_HINTS_HORZ_SNAP;
642
* We snap the width of horizontal stems for the monochrome and
643
* vertical LCD rendering targets only.
645
if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )
646
other_flags |= AF_LATIN_HINTS_VERT_SNAP;
649
* We adjust stems to full pixels only if we don't use the `light' mode.
651
if ( mode != FT_RENDER_MODE_LIGHT )
652
other_flags |= AF_LATIN_HINTS_STEM_ADJUST;
654
if ( mode == FT_RENDER_MODE_MONO )
655
other_flags |= AF_LATIN_HINTS_MONO;
657
scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE;
659
hints->scaler_flags = scaler_flags;
660
hints->other_flags = other_flags;
666
/*************************************************************************/
667
/*************************************************************************/
669
/***** C J K G L Y P H G R I D - F I T T I N G *****/
671
/*************************************************************************/
672
/*************************************************************************/
674
/* snap a given width in scaled coordinates to one of the */
675
/* current standard widths */
678
af_cjk_snap_width( AF_Width widths,
683
FT_Pos best = 64 + 32 + 2;
684
FT_Pos reference = width;
688
for ( n = 0; n < count; n++ )
705
scaled = FT_PIX_ROUND( reference );
707
if ( width >= reference )
709
if ( width < scaled + 48 )
714
if ( width > scaled - 48 )
722
/* compute the snapped width of a given stem */
725
af_cjk_compute_stem_width( AF_GlyphHints hints,
728
AF_Edge_Flags base_flags,
729
AF_Edge_Flags stem_flags )
731
AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics;
732
AF_LatinAxis axis = & metrics->axis[dim];
735
FT_Int vertical = ( dim == AF_DIMENSION_VERT );
737
FT_UNUSED( base_flags );
738
FT_UNUSED( stem_flags );
741
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
750
if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||
751
( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )
753
/* smooth hinting process: very lightly quantize the stem width */
755
if ( axis->width_count > 0 )
757
if ( FT_ABS( dist - axis->widths[0].cur ) < 40 )
759
dist = axis->widths[0].cur;
768
dist += ( 54 - dist ) / 2 ;
769
else if ( dist < 3 * 64 )
779
else if ( delta < 22 )
781
else if ( delta < 42 )
783
else if ( delta < 54 )
791
/* strong hinting process: snap the stem width to integer pixels */
793
dist = af_cjk_snap_width( axis->widths, axis->width_count, dist );
797
/* in the case of vertical hinting, always round */
798
/* the stem heights to integer pixels */
801
dist = ( dist + 16 ) & ~63;
807
if ( AF_LATIN_HINTS_DO_MONO( hints ) )
809
/* monochrome horizontal hinting: snap widths to integer pixels */
810
/* with a different threshold */
815
dist = ( dist + 32 ) & ~63;
819
/* for horizontal anti-aliased hinting, we adopt a more subtle */
820
/* approach: we strengthen small stems, round stems whose size */
821
/* is between 1 and 2 pixels to an integer, otherwise nothing */
824
dist = ( dist + 64 ) >> 1;
826
else if ( dist < 128 )
827
dist = ( dist + 22 ) & ~63;
829
/* round otherwise to prevent color fringes in LCD mode */
830
dist = ( dist + 32 ) & ~63;
843
/* align one stem edge relative to the previous stem edge */
846
af_cjk_align_linked_edge( AF_GlyphHints hints,
851
FT_Pos dist = stem_edge->opos - base_edge->opos;
853
FT_Pos fitted_width = af_cjk_compute_stem_width(
855
(AF_Edge_Flags)base_edge->flags,
856
(AF_Edge_Flags)stem_edge->flags );
859
stem_edge->pos = base_edge->pos + fitted_width;
864
af_cjk_align_serif_edge( AF_GlyphHints hints,
870
serif->pos = base->pos + ( serif->opos - base->opos );
874
/*************************************************************************/
875
/*************************************************************************/
876
/*************************************************************************/
878
/**** E D G E H I N T I N G ****/
880
/*************************************************************************/
881
/*************************************************************************/
882
/*************************************************************************/
885
#define AF_LIGHT_MODE_MAX_HORZ_GAP 9
886
#define AF_LIGHT_MODE_MAX_VERT_GAP 15
887
#define AF_LIGHT_MODE_MAX_DELTA_ABS 14
891
af_hint_normal_stem( AF_GlyphHints hints,
897
FT_Pos org_len, cur_len, org_center;
898
FT_Pos cur_pos1, cur_pos2;
899
FT_Pos d_off1, u_off1, d_off2, u_off2, delta;
901
FT_Pos threshold = 64;
904
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
906
if ( ( edge->flags & AF_EDGE_ROUND ) &&
907
( edge2->flags & AF_EDGE_ROUND ) )
909
if ( dim == AF_DIMENSION_VERT )
910
threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP;
912
threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP;
916
if ( dim == AF_DIMENSION_VERT )
917
threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3;
919
threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3;
923
org_len = edge2->opos - edge->opos;
924
cur_len = af_cjk_compute_stem_width( hints, dim, org_len,
925
(AF_Edge_Flags)edge->flags,
926
(AF_Edge_Flags)edge2->flags );
928
org_center = ( edge->opos + edge2->opos ) / 2 + anchor;
929
cur_pos1 = org_center - cur_len / 2;
930
cur_pos2 = cur_pos1 + cur_len;
931
d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 );
932
d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 );
933
u_off1 = 64 - d_off1;
934
u_off2 = 64 - d_off2;
938
if ( d_off1 == 0 || d_off2 == 0 )
941
if ( cur_len <= threshold )
943
if ( d_off2 < cur_len )
945
if ( u_off1 <= d_off2 )
954
if ( threshold < 64 )
956
if ( d_off1 >= threshold || u_off1 >= threshold ||
957
d_off2 >= threshold || u_off2 >= threshold )
961
offset = cur_len % 64;
965
if ( u_off1 <= offset || d_off2 <= offset )
969
offset = 64 - threshold;
971
d_off1 = threshold - u_off1;
972
u_off1 = u_off1 - offset;
973
u_off2 = threshold - d_off2;
974
d_off2 = d_off2 - offset;
976
if ( d_off1 <= u_off1 )
979
if ( d_off2 <= u_off2 )
982
if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) )
990
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) )
992
if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS )
993
delta = AF_LIGHT_MODE_MAX_DELTA_ABS;
994
else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS )
995
delta = -AF_LIGHT_MODE_MAX_DELTA_ABS;
1001
if ( edge->opos < edge2->opos )
1003
edge->pos = cur_pos1;
1004
edge2->pos = cur_pos1 + cur_len;
1008
edge->pos = cur_pos1 + cur_len;
1009
edge2->pos = cur_pos1;
1017
af_cjk_hint_edges( AF_GlyphHints hints,
1020
AF_AxisHints axis = &hints->axis[dim];
1021
AF_Edge edges = axis->edges;
1022
AF_Edge edge_limit = edges + axis->num_edges;
1030
/* now we align all stem edges. */
1031
for ( edge = edges; edge < edge_limit; edge++ )
1036
if ( edge->flags & AF_EDGE_DONE )
1039
/* skip all non-stem edges */
1047
/* now align the stem */
1051
af_cjk_align_linked_edge( hints, dim, edge2, edge );
1052
edge->flags |= AF_EDGE_DONE;
1056
if ( dim != AF_DIMENSION_VERT && !anchor )
1062
AF_Edge left = edge;
1063
AF_Edge right = edge_limit - 1;
1064
AF_EdgeRec left1, left2, right1, right2;
1065
FT_Pos target, center1, center2;
1066
FT_Pos delta1, delta2, d1, d2;
1069
while ( right > left && !right->link )
1073
left2 = *left->link;
1074
right1 = *right->link;
1077
delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2;
1078
target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16;
1081
delta1 += af_hint_normal_stem( hints, left, left->link,
1084
if ( left->link != right )
1085
af_hint_normal_stem( hints, right->link, right, delta1, 0 );
1087
center1 = left->pos + ( right->pos - left->pos ) / 2;
1089
if ( center1 >= target )
1090
delta2 = delta - 32;
1092
delta2 = delta + 32;
1094
delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 );
1096
if ( delta1 != delta2 )
1098
if ( left->link != right )
1099
af_hint_normal_stem( hints, &right1, &right2, delta2, 0 );
1101
center2 = left1.pos + ( right2.pos - left1.pos ) / 2;
1103
d1 = center1 - target;
1104
d2 = center2 - target;
1106
if ( FT_ABS( d2 ) < FT_ABS( d1 ) )
1108
left->pos = left1.pos;
1109
left->link->pos = left2.pos;
1111
if ( left->link != right )
1113
right->link->pos = right1.pos;
1114
right->pos = right2.pos;
1122
right->link->flags |= AF_EDGE_DONE;
1123
right->flags |= AF_EDGE_DONE;
1129
delta = af_hint_normal_stem( hints, edge, edge2, 0,
1130
AF_DIMENSION_HORZ );
1133
af_hint_normal_stem( hints, edge, edge2, delta, dim );
1136
printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n",
1137
edge - edges, edge2 - edges,
1138
( edge->pos - edge->opos ) / 64.0,
1139
( edge2->pos - edge2->opos ) / 64.0 );
1143
edge->flags |= AF_EDGE_DONE;
1144
edge2->flags |= AF_EDGE_DONE;
1147
/* make sure that lowercase m's maintain their symmetry */
1149
/* In general, lowercase m's have six vertical edges if they are sans */
1150
/* serif, or twelve if they are with serifs. This implementation is */
1151
/* based on that assumption, and seems to work very well with most */
1152
/* faces. However, if for a certain face this assumption is not */
1153
/* true, the m is just rendered like before. In addition, any stem */
1154
/* correction will only be applied to symmetrical glyphs (even if the */
1155
/* glyph is not an m), so the potential for unwanted distortion is */
1156
/* relatively low. */
1158
/* We don't handle horizontal edges since we can't easily assure that */
1159
/* the third (lowest) stem aligns with the base line; it might end up */
1160
/* one pixel higher or lower. */
1162
n_edges = edge_limit - edges;
1163
if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )
1165
AF_Edge edge1, edge2, edge3;
1166
FT_Pos dist1, dist2, span;
1182
dist1 = edge2->opos - edge1->opos;
1183
dist2 = edge3->opos - edge2->opos;
1185
span = dist1 - dist2;
1189
if ( edge1->link == edge1 + 1 &&
1190
edge2->link == edge2 + 1 &&
1191
edge3->link == edge3 + 1 && span < 8 )
1193
delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
1194
edge3->pos -= delta;
1196
edge3->link->pos -= delta;
1198
/* move the serifs along with the stem */
1199
if ( n_edges == 12 )
1201
( edges + 8 )->pos -= delta;
1202
( edges + 11 )->pos -= delta;
1205
edge3->flags |= AF_EDGE_DONE;
1207
edge3->link->flags |= AF_EDGE_DONE;
1215
* now hint the remaining edges (serifs and single) in order
1216
* to complete our processing
1218
for ( edge = edges; edge < edge_limit; edge++ )
1220
if ( edge->flags & AF_EDGE_DONE )
1225
af_cjk_align_serif_edge( hints, edge->serif, edge );
1226
edge->flags |= AF_EDGE_DONE;
1234
for ( edge = edges; edge < edge_limit; edge++ )
1236
AF_Edge before, after;
1239
if ( edge->flags & AF_EDGE_DONE )
1242
before = after = edge;
1244
while ( --before >= edges )
1245
if ( before->flags & AF_EDGE_DONE )
1248
while ( ++after < edge_limit )
1249
if ( after->flags & AF_EDGE_DONE )
1252
if ( before >= edges || after < edge_limit )
1254
if ( before < edges )
1255
af_cjk_align_serif_edge( hints, after, edge );
1256
else if ( after >= edge_limit )
1257
af_cjk_align_serif_edge( hints, before, edge );
1260
if ( after->fpos == before->fpos )
1261
edge->pos = before->pos;
1263
edge->pos = before->pos +
1264
FT_MulDiv( edge->fpos - before->fpos,
1265
after->pos - before->pos,
1266
after->fpos - before->fpos );
1274
af_cjk_align_edge_points( AF_GlyphHints hints,
1277
AF_AxisHints axis = & hints->axis[dim];
1278
AF_Edge edges = axis->edges;
1279
AF_Edge edge_limit = edges + axis->num_edges;
1284
snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ &&
1285
AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ||
1286
( dim == AF_DIMENSION_VERT &&
1287
AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) );
1289
for ( edge = edges; edge < edge_limit; edge++ )
1291
/* move the points of each segment */
1292
/* in each edge to the edge's position */
1293
AF_Segment seg = edge->first;
1300
AF_Point point = seg->first;
1305
if ( dim == AF_DIMENSION_HORZ )
1307
point->x = edge->pos;
1308
point->flags |= AF_FLAG_TOUCH_X;
1312
point->y = edge->pos;
1313
point->flags |= AF_FLAG_TOUCH_Y;
1316
if ( point == seg->last )
1319
point = point->next;
1322
seg = seg->edge_next;
1324
} while ( seg != edge->first );
1328
FT_Pos delta = edge->pos - edge->opos;
1333
AF_Point point = seg->first;
1338
if ( dim == AF_DIMENSION_HORZ )
1341
point->flags |= AF_FLAG_TOUCH_X;
1346
point->flags |= AF_FLAG_TOUCH_Y;
1349
if ( point == seg->last )
1352
point = point->next;
1355
seg = seg->edge_next;
1357
} while ( seg != edge->first );
1363
FT_LOCAL_DEF( FT_Error )
1364
af_cjk_hints_apply( AF_GlyphHints hints,
1365
FT_Outline* outline,
1366
AF_LatinMetrics metrics )
1371
FT_UNUSED( metrics );
1374
error = af_glyph_hints_reload( hints, outline );
1378
/* analyze glyph outline */
1379
if ( AF_HINTS_DO_HORIZONTAL( hints ) )
1381
error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );
1386
if ( AF_HINTS_DO_VERTICAL( hints ) )
1388
error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );
1393
/* grid-fit the outline */
1394
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
1396
if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
1397
( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
1400
#ifdef AF_USE_WARPER
1401
if ( dim == AF_DIMENSION_HORZ &&
1402
metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL )
1404
AF_WarperRec warper;
1409
af_warper_compute( &warper, hints, dim, &scale, &delta );
1410
af_glyph_hints_scale_dim( hints, dim, scale, delta );
1413
#endif /* AF_USE_WARPER */
1415
af_cjk_hint_edges( hints, (AF_Dimension)dim );
1416
af_cjk_align_edge_points( hints, (AF_Dimension)dim );
1417
af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
1418
af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
1423
af_glyph_hints_dump_points( hints );
1424
af_glyph_hints_dump_segments( hints );
1425
af_glyph_hints_dump_edges( hints );
1428
af_glyph_hints_save( hints, outline );
1435
/*************************************************************************/
1436
/*************************************************************************/
1438
/***** C J K S C R I P T C L A S S *****/
1440
/*************************************************************************/
1441
/*************************************************************************/
1444
static const AF_Script_UniRangeRec af_cjk_uniranges[] =
1447
AF_UNIRANGE_REC( 0x0100UL, 0xFFFFUL ), /* why this? */
1449
AF_UNIRANGE_REC( 0x2E80UL, 0x2EFFUL ), /* CJK Radicals Supplement */
1450
AF_UNIRANGE_REC( 0x2F00UL, 0x2FDFUL ), /* Kangxi Radicals */
1451
AF_UNIRANGE_REC( 0x3000UL, 0x303FUL ), /* CJK Symbols and Punctuation */
1452
AF_UNIRANGE_REC( 0x3040UL, 0x309FUL ), /* Hiragana */
1453
AF_UNIRANGE_REC( 0x30A0UL, 0x30FFUL ), /* Katakana */
1454
AF_UNIRANGE_REC( 0x3100UL, 0x312FUL ), /* Bopomofo */
1455
AF_UNIRANGE_REC( 0x3130UL, 0x318FUL ), /* Hangul Compatibility Jamo */
1456
AF_UNIRANGE_REC( 0x31A0UL, 0x31BFUL ), /* Bopomofo Extended */
1457
AF_UNIRANGE_REC( 0x31C0UL, 0x31EFUL ), /* CJK Strokes */
1458
AF_UNIRANGE_REC( 0x31F0UL, 0x31FFUL ), /* Katakana Phonetic Extensions */
1459
AF_UNIRANGE_REC( 0x3200UL, 0x32FFUL ), /* Enclosed CJK Letters and Months */
1460
AF_UNIRANGE_REC( 0x3300UL, 0x33FFUL ), /* CJK Compatibility */
1461
AF_UNIRANGE_REC( 0x3400UL, 0x4DBFUL ), /* CJK Unified Ideographs Extension A */
1462
AF_UNIRANGE_REC( 0x4DC0UL, 0x4DFFUL ), /* Yijing Hexagram Symbols */
1463
AF_UNIRANGE_REC( 0x4E00UL, 0x9FFFUL ), /* CJK Unified Ideographs */
1464
AF_UNIRANGE_REC( 0xF900UL, 0xFAFFUL ), /* CJK Compatibility Ideographs */
1465
AF_UNIRANGE_REC( 0xFE30UL, 0xFE4FUL ), /* CJK Compatibility Forms */
1466
AF_UNIRANGE_REC( 0xFF00UL, 0xFFEFUL ), /* Halfwidth and Fullwidth Forms */
1467
AF_UNIRANGE_REC( 0x20000UL, 0x2A6DFUL ), /* CJK Unified Ideographs Extension B */
1468
AF_UNIRANGE_REC( 0x2F800UL, 0x2FA1FUL ), /* CJK Compatibility Ideographs Supplement */
1469
AF_UNIRANGE_REC( 0UL, 0UL )
1473
AF_DEFINE_SCRIPT_CLASS(af_cjk_script_class,
1477
sizeof( AF_LatinMetricsRec ),
1479
(AF_Script_InitMetricsFunc) af_cjk_metrics_init,
1480
(AF_Script_ScaleMetricsFunc)af_cjk_metrics_scale,
1481
(AF_Script_DoneMetricsFunc) NULL,
1483
(AF_Script_InitHintsFunc) af_cjk_hints_init,
1484
(AF_Script_ApplyHintsFunc) af_cjk_hints_apply
1487
#else /* !AF_CONFIG_OPTION_CJK */
1489
static const AF_Script_UniRangeRec af_cjk_uniranges[] =
1491
AF_UNIRANGE_REC( 0UL, 0UL )
1495
AF_DEFINE_SCRIPT_CLASS(af_cjk_script_class,
1499
sizeof( AF_LatinMetricsRec ),
1501
(AF_Script_InitMetricsFunc) NULL,
1502
(AF_Script_ScaleMetricsFunc)NULL,
1503
(AF_Script_DoneMetricsFunc) NULL,
1505
(AF_Script_InitHintsFunc) NULL,
1506
(AF_Script_ApplyHintsFunc) NULL
1509
#endif /* !AF_CONFIG_OPTION_CJK */