1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
|
/* Copyright (C) 2001-2021 Artifex Software, Inc.
All Rights Reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato,
CA 94945, U.S.A., +1(415)492-9861, for further information.
*/
/* A bridge to True Type interpreter. */
#include "gx.h"
#include "gxfont.h"
#include "gxfont42.h"
#include "gxttfb.h"
#include "gxfixed.h"
#include "gxpath.h"
#include "gxfcache.h"
#include "gxmatrix.h"
#include "gxhintn.h"
#include "gzpath.h"
#include "ttfmemd.h"
#include "gsstruct.h"
#include "gserrors.h"
#include "gsfont.h"
#include "gdebug.h"
#include "memory_.h"
#include "math_.h"
#include "gxgstate.h"
#include "gxpaint.h"
#include "gzspotan.h"
#include <stdarg.h>
gs_public_st_composite(st_gx_ttfReader, gx_ttfReader,
"gx_ttfReader", gx_ttfReader_enum_ptrs, gx_ttfReader_reloc_ptrs);
static
ENUM_PTRS_WITH(gx_ttfReader_enum_ptrs, gx_ttfReader *mptr)
{
/* The fields 'pfont' and 'glyph_data' may contain pointers from global
to local memory ( see a comment in gxttfb.h).
They must be NULL when a garbager is invoked.
Due to that we don't enumerate and don't relocate them.
*/
DISCARD(mptr);
return 0;
}
ENUM_PTR(0, gx_ttfReader, memory);
ENUM_PTRS_END
static RELOC_PTRS_WITH(gx_ttfReader_reloc_ptrs, gx_ttfReader *mptr)
DISCARD(mptr);
RELOC_PTR(gx_ttfReader, memory);
RELOC_PTRS_END
static bool gx_ttfReader__Eof(ttfReader *self)
{
gx_ttfReader *r = (gx_ttfReader *)self;
if (r->extra_glyph_index != -1)
return r->pos >= r->glyph_data.bits.size;
/* We can't know whether pfont->data.string_proc has more bytes,
so we never report Eof for it. */
return false;
}
static void gx_ttfReader__Read(ttfReader *self, void *p, int n)
{
gx_ttfReader *r = (gx_ttfReader *)self;
const byte *q;
if (r->error >= 0) {
if (r->extra_glyph_index != -1) {
q = r->glyph_data.bits.data + r->pos;
r->error = ((r->pos >= r->glyph_data.bits.size ||
r->glyph_data.bits.size - r->pos < n) ?
gs_note_error(gs_error_invalidfont) : 0);
if (r->error == 0)
memcpy(p, q, n);
} else {
unsigned int cnt;
r->error = 0;
for (cnt = 0; cnt < (uint)n; cnt += r->error) {
r->error = r->pfont->data.string_proc(r->pfont, (ulong)r->pos + cnt, (ulong)n - cnt, &q);
if (r->error < 0)
break;
else if ( r->error == 0) {
memcpy((char *)p + cnt, q, n - cnt);
break;
} else {
memcpy((char *)p + cnt, q, r->error);
}
}
}
}
if (r->error < 0) {
memset(p, 0, n);
return;
}
r->pos += n;
}
static void gx_ttfReader__Seek(ttfReader *self, int nPos)
{
gx_ttfReader *r = (gx_ttfReader *)self;
r->pos = nPos;
}
static int gx_ttfReader__Tell(ttfReader *self)
{
gx_ttfReader *r = (gx_ttfReader *)self;
return r->pos;
}
static bool gx_ttfReader__Error(ttfReader *self)
{
gx_ttfReader *r = (gx_ttfReader *)self;
return r->error;
}
static int gx_ttfReader__LoadGlyph(ttfReader *self, int glyph_index, const byte **p, int *size)
{
gx_ttfReader *r = (gx_ttfReader *)self;
gs_font_type42 *pfont = r->pfont;
int code;
if (r->extra_glyph_index != -1)
return 0; /* We only maintain a single glyph buffer.
It's enough because ttfOutliner__BuildGlyphOutline
is optimized for that, and pfont->data.get_outline
implements a charstring cache. */
r->glyph_data.memory = pfont->memory;
code = pfont->data.get_outline(pfont, (uint)glyph_index, &r->glyph_data);
r->extra_glyph_index = glyph_index;
r->pos = 0;
if (code < 0)
r->error = code;
else if (code > 0) {
/* Should not happen. */
r->error = gs_note_error(gs_error_unregistered);
} else {
*p = r->glyph_data.bits.data;
*size = r->glyph_data.bits.size;
}
return 2; /* found */
}
static void gx_ttfReader__ReleaseGlyph(ttfReader *self, int glyph_index)
{
gx_ttfReader *r = (gx_ttfReader *)self;
if (r->extra_glyph_index != glyph_index)
return;
r->extra_glyph_index = -1;
gs_glyph_data_free(&r->glyph_data, "gx_ttfReader__ReleaseExtraGlyph");
}
static void gx_ttfReader__Reset(gx_ttfReader *self)
{
if (self->extra_glyph_index != -1) {
self->extra_glyph_index = -1;
gs_glyph_data_free(&self->glyph_data, "gx_ttfReader__Reset");
}
self->error = 0;
self->pos = 0;
}
gx_ttfReader *gx_ttfReader__create(gs_memory_t *mem)
{
gx_ttfReader *r = gs_alloc_struct(mem, gx_ttfReader, &st_gx_ttfReader, "gx_ttfReader__create");
if (r != NULL) {
r->super.Eof = gx_ttfReader__Eof;
r->super.Read = gx_ttfReader__Read;
r->super.Seek = gx_ttfReader__Seek;
r->super.Tell = gx_ttfReader__Tell;
r->super.Error = gx_ttfReader__Error;
r->super.LoadGlyph = gx_ttfReader__LoadGlyph;
r->super.ReleaseGlyph = gx_ttfReader__ReleaseGlyph;
r->pos = 0;
r->error = 0;
r->extra_glyph_index = -1;
memset(&r->glyph_data, 0, sizeof(r->glyph_data));
r->pfont = NULL;
r->memory = mem;
gx_ttfReader__Reset(r);
}
return r;
}
void gx_ttfReader__destroy(gx_ttfReader *self)
{
gs_free_object(self->memory, self, "gx_ttfReader__destroy");
}
static int
gx_ttfReader__default_get_metrics(const ttfReader *ttf, uint glyph_index, bool bVertical,
short *sideBearing, unsigned short *nAdvance)
{
gx_ttfReader *self = (gx_ttfReader *)ttf;
float sbw[4];
int sbw_offset = bVertical;
int code;
int factor = self->pfont->data.unitsPerEm;
code = self->pfont->data.get_metrics(self->pfont, glyph_index, bVertical, sbw);
if (code < 0)
return code;
/* Due to an obsolete convention, simple_glyph_metrics scales
the metrics into 1x1 rectangle as Postscript like.
In same time, the True Type interpreter needs
the original design units.
Undo the scaling here with accurate rounding. */
*sideBearing = (short)floor(sbw[0 + sbw_offset] * factor + 0.5);
*nAdvance = (short)floor(sbw[2 + sbw_offset] * factor + 0.5);
return 0;
}
void gx_ttfReader__set_font(gx_ttfReader *self, gs_font_type42 *pfont)
{
self->pfont = pfont;
self->super.get_metrics = gx_ttfReader__default_get_metrics;
}
/*----------------------------------------------*/
static void DebugRepaint(ttfFont *ttf)
{
}
#ifdef DEBUG
static int DebugPrint(ttfFont *ttf, const char *fmt, ...)
{
char buf[500];
va_list args;
int count;
if (gs_debug_c('Y')) {
va_start(args, fmt);
count = vsnprintf(buf, sizeof(buf), fmt, args);
/* NB: moved debug output from stdout to stderr
*/
errwrite(ttf->DebugMem, buf, count);
va_end(args);
}
return 0;
}
#endif
static void WarnBadInstruction(gs_font_type42 *pfont, int glyph_index)
{
char buf[gs_font_name_max + 1];
int l;
gs_font_type42 *base_font = pfont;
while ((gs_font_type42 *)base_font->base != base_font)
base_font = (gs_font_type42 *)base_font->base;
if (!base_font->data.warning_bad_instruction) {
l = min(sizeof(buf) - 1, base_font->font_name.size);
memcpy(buf, base_font->font_name.chars, l);
buf[l] = 0;
if (glyph_index >= 0)
emprintf2(pfont->memory,
"Failed to interpret TT instructions for glyph index %d of font %s. "
"Continue ignoring instructions of the font.\n",
glyph_index, buf);
else
emprintf1(pfont->memory,
"Failed to interpret TT instructions in font %s. "
"Continue ignoring instructions of the font.\n",
buf);
base_font->data.warning_bad_instruction = true;
}
}
static void WarnPatented(gs_font_type42 *pfont, ttfFont *ttf, const char *txt)
{
if (!ttf->design_grid) {
char buf[gs_font_name_max + 1];
int l;
gs_font_type42 *base_font = pfont;
while ((gs_font_type42 *)base_font->base != base_font)
base_font = (gs_font_type42 *)base_font->base;
if (!base_font->data.warning_patented) {
l = min(sizeof(buf) - 1, base_font->font_name.size);
memcpy(buf, base_font->font_name.chars, l);
buf[l] = 0;
emprintf2(pfont->memory,
"%s %s requires a patented True Type interpreter.\n",
txt,
buf);
base_font->data.warning_patented = true;
}
}
}
/*----------------------------------------------*/
struct gx_ttfMemory_s {
ttfMemory super;
gs_memory_t *memory;
};
gs_private_st_simple(st_gx_ttfMemory, gx_ttfMemory, "gx_ttfMemory");
/* st_gx_ttfMemory::memory points to a root. */
static void *gx_ttfMemory__alloc_bytes(ttfMemory *self, int size, const char *cname)
{
gs_memory_t *mem = ((gx_ttfMemory *)self)->memory;
return gs_alloc_bytes(mem, size, cname);
}
static void *gx_ttfMemory__alloc_struct(ttfMemory *self, const ttfMemoryDescriptor *d, const char *cname)
{
gs_memory_t *mem = ((gx_ttfMemory *)self)->memory;
return mem->procs.alloc_struct(mem, (const gs_memory_struct_type_t *)d, cname);
}
static void gx_ttfMemory__free(ttfMemory *self, void *p, const char *cname)
{
gs_memory_t *mem = ((gx_ttfMemory *)self)->memory;
gs_free_object(mem, p, cname);
}
/*----------------------------------------------*/
static inline float reminder(float v, int x)
{
return ((v / x) - floor(v / x)) * x;
}
static void decompose_matrix(const gs_font_type42 *pfont, const gs_matrix * char_tm,
const gs_log2_scale_point *log2_scale, bool design_grid,
gs_point *char_size, gs_point *subpix_origin, gs_matrix *post_transform, bool *dg)
{
/*
* char_tm maps to subpixels.
*/
/*
* We use a Free Type 1 True Type interpreter, which cannot perform
* a grid-fitting with skewing/rotation. It appears acceptable
* because we want to minimize invocations of patented instructions.
* We believe that skewing/rotation requires the patented intrivial cases
* of projection/freedom vectors.
*/
int scale_x = 1 << log2_scale->x;
int scale_y = 1 << log2_scale->y;
bool atp = gs_currentaligntopixels(pfont->dir);
bool design_grid1;
char_size->x = hypot(char_tm->xx, char_tm->xy);
char_size->y = hypot(char_tm->yx, char_tm->yy);
if (char_size->x <= 2 && char_size->y <= 2) {
/* Disable the grid fitting for very small fonts. */
design_grid1 = true;
} else
design_grid1 = design_grid || !(gs_currentgridfittt(pfont->dir) & 1);
*dg = design_grid1;
subpix_origin->x = (atp ? 0 : reminder(char_tm->tx, scale_x) / scale_x);
subpix_origin->y = (atp ? 0 : reminder(char_tm->ty, scale_y) / scale_y);
post_transform->xx = char_tm->xx / (design_grid1 ? 1 : char_size->x);
post_transform->xy = char_tm->xy / (design_grid1 ? 1 : char_size->x);
post_transform->yx = char_tm->yx / (design_grid1 ? 1 : char_size->y);
post_transform->yy = char_tm->yy / (design_grid1 ? 1 : char_size->y);
post_transform->tx = char_tm->tx - subpix_origin->x;
post_transform->ty = char_tm->ty - subpix_origin->y;
}
/*----------------------------------------------*/
ttfFont *ttfFont__create(gs_font_dir *dir)
{
gs_memory_t *mem = dir->memory->stable_memory;
ttfFont *ttf;
if (dir->ttm == NULL) {
gx_ttfMemory *m = gs_alloc_struct(mem, gx_ttfMemory, &st_gx_ttfMemory, "ttfFont__create(gx_ttfMemory)");
if (!m)
return 0;
m->super.alloc_struct = gx_ttfMemory__alloc_struct;
m->super.alloc_bytes = gx_ttfMemory__alloc_bytes;
m->super.free = gx_ttfMemory__free;
m->memory = mem;
dir->ttm = m;
}
if(ttfInterpreter__obtain(&dir->ttm->super, &dir->tti))
return 0;
if(gx_san__obtain(mem, &dir->san))
return 0;
ttf = gs_alloc_struct(mem, ttfFont, &st_ttfFont, "ttfFont__create");
if (ttf == NULL)
return 0;
#ifdef DEBUG
ttfFont__init(ttf, &dir->ttm->super, DebugRepaint,
(gs_debug_c('Y') ? DebugPrint : NULL), mem);
#else
ttfFont__init(ttf, &dir->ttm->super, DebugRepaint, NULL, mem);
#endif
return ttf;
}
void ttfFont__destroy(ttfFont *self, gs_font_dir *dir)
{
gs_memory_t *mem = dir->memory->stable_memory;
ttfFont__finit(self);
gs_free_object(mem, self, "ttfFont__destroy");
ttfInterpreter__release(&dir->tti);
gx_san__release(&dir->san);
if (dir->tti == NULL && dir->ttm != NULL) {
gs_free_object(mem, dir->ttm, "ttfFont__destroy(gx_ttfMemory)");
dir->ttm = NULL;
}
}
int ttfFont__Open_aux(ttfFont *self, ttfInterpreter *tti, gx_ttfReader *r, gs_font_type42 *pfont,
const gs_matrix * char_tm, const gs_log2_scale_point *log2_scale,
bool design_grid)
{
gs_point char_size, subpix_origin;
gs_matrix post_transform;
/*
* Ghostscript proceses a TTC index in gs/lib/gs_ttf.ps,
* and *pfont already adjusted to it.
* Therefore TTC headers never comes here.
*/
unsigned int nTTC = 0;
bool dg;
decompose_matrix(pfont, char_tm, log2_scale, design_grid, &char_size, &subpix_origin, &post_transform, &dg);
switch(ttfFont__Open(tti, self, &r->super, nTTC, char_size.x, char_size.y, dg)) {
case fNoError:
return 0;
case fMemoryError:
return_error(gs_error_VMerror);
case fUnimplemented:
return_error(gs_error_unregistered);
case fBadInstruction:
WarnBadInstruction(pfont, -1);
goto recover;
case fPatented:
WarnPatented(pfont, self, "The font");
recover:
self->patented = true;
return 0;
default:
{ int code = r->super.Error(&r->super);
if (code < 0)
return code;
return_error(gs_error_invalidfont);
}
}
}
/*----------------------------------------------*/
typedef struct gx_ttfExport_s {
ttfExport super;
gx_path *path;
gs_fixed_point w;
int error;
bool monotonize;
} gx_ttfExport;
static void gx_ttfExport__MoveTo(ttfExport *self, FloatPoint *p)
{
gx_ttfExport *e = (gx_ttfExport *)self;
if (e->error >= 0)
e->error = gx_path_add_point(e->path, float2fixed(p->x), float2fixed(p->y));
}
static void gx_ttfExport__LineTo(ttfExport *self, FloatPoint *p)
{
gx_ttfExport *e = (gx_ttfExport *)self;
if (e->error >= 0)
e->error = gx_path_add_line_notes(e->path, float2fixed(p->x), float2fixed(p->y), sn_none);
}
static void gx_ttfExport__CurveTo(ttfExport *self, FloatPoint *p0, FloatPoint *p1, FloatPoint *p2)
{
gx_ttfExport *e = (gx_ttfExport *)self;
if (e->error >= 0) {
if (e->monotonize) {
curve_segment s;
s.notes = sn_none;
s.p1.x = float2fixed(p0->x), s.p1.y = float2fixed(p0->y),
s.p2.x = float2fixed(p1->x), s.p2.y = float2fixed(p1->y),
s.pt.x = float2fixed(p2->x), s.pt.y = float2fixed(p2->y);
e->error = gx_curve_monotonize(e->path, &s);
} else
e->error = gx_path_add_curve_notes(e->path, float2fixed(p0->x), float2fixed(p0->y),
float2fixed(p1->x), float2fixed(p1->y),
float2fixed(p2->x), float2fixed(p2->y), sn_none);
}
}
static void gx_ttfExport__Close(ttfExport *self)
{
gx_ttfExport *e = (gx_ttfExport *)self;
if (e->error >= 0)
e->error = gx_path_close_subpath_notes(e->path, sn_none);
}
static void gx_ttfExport__Point(ttfExport *self, FloatPoint *p, bool bOnCurve, bool bNewPath)
{
/* Never called. */
}
static void gx_ttfExport__SetWidth(ttfExport *self, FloatPoint *p)
{
gx_ttfExport *e = (gx_ttfExport *)self;
e->w.x = float2fixed(p->x);
e->w.y = float2fixed(p->y);
}
static void gx_ttfExport__DebugPaint(ttfExport *self)
{
}
/*----------------------------------------------*/
static int
path_to_hinter(t1_hinter *h, gx_path *path)
{ int code;
gs_path_enum penum;
gs_fixed_point pts[3];
gs_fixed_point p = {0, 0}; /* initialize to avoid a warning */
bool first = true;
int op;
code = gx_path_enum_init(&penum, path);
if (code < 0)
return code;
while ((op = gx_path_enum_next(&penum, pts)) != 0) {
switch (op) {
case gs_pe_moveto:
if (first) {
first = false;
p = pts[0];
code = t1_hinter__rmoveto(h, p.x, p.y);
} else
code = t1_hinter__rmoveto(h, pts[0].x - p.x, pts[0].y - p.y);
break;
case gs_pe_lineto:
case gs_pe_gapto:
code = t1_hinter__rlineto(h, pts[0].x - p.x, pts[0].y - p.y);
break;
case gs_pe_curveto:
code = t1_hinter__rcurveto(h, pts[0].x - p.x, pts[0].y - p.y,
pts[1].x - pts[0].x, pts[1].y - pts[0].y,
pts[2].x - pts[1].x, pts[2].y - pts[1].y);
pts[0] = pts[2];
break;
case gs_pe_closepath:
code = t1_hinter__closepath(h);
break;
default:
return_error(gs_error_unregistered);
}
if (code < 0)
return code;
p = pts[0];
}
return 0;
}
#define exch(a,b) a^=b; b^=a; a^=b;
static void
transpose_path(gx_path *path)
{ segment *s = (segment *)path->first_subpath;
exch(path->bbox.p.x, path->bbox.p.y);
exch(path->bbox.q.x, path->bbox.q.y);
for (; s; s = s->next) {
if (s->type == s_curve) {
curve_segment *c = (curve_segment *)s;
exch(c->p1.x, c->p1.y);
exch(c->p2.x, c->p2.y);
}
exch(s->pt.x, s->pt.y);
}
}
typedef struct {
t1_hinter super;
int transpose;
fixed midx;
} t1_hinter_aux;
static int
stem_hint_handler(void *client_data, gx_san_sect *ss)
{
t1_hinter_aux *h = (t1_hinter_aux *)client_data;
if (ss->side_mask == 3) {
/* Orient horizontal hints to help with top/bottom alignment zones.
Otherwize glyphs may get a random height due to serif adjustsment. */
if (ss->xl > h->midx && h->transpose)
return (h->transpose ? t1_hinter__hstem : t1_hinter__vstem)
(&h->super, ss->xr, ss->xl - ss->xr);
else
return (h->transpose ? t1_hinter__hstem : t1_hinter__vstem)
(&h->super, ss->xl, ss->xr - ss->xl);
} else
return t1_hinter__overall_hstem(&h->super, ss->xl, ss->xr - ss->xl, ss->side_mask);
}
#define OVERALL_HINT 0 /* Overall hints help to emulate Type 1 alignment zones
(except for overshoot suppression.)
For example, without it comparefiles/type42_glyph_index.ps
some glyphs have different height due to
serifs are aligned in same way as horizontal stems,
but both sides of a stem have same priority.
This stuff appears low useful, because horizontal
hint orientation performs this job perfectly.
fixme : remove.
fixme : remove side_mask from gxhintn.c .
*/
static int grid_fit(gx_device_spot_analyzer *padev, gx_path *path,
gs_font_type42 *pfont, const gs_log2_scale_point *pscale, gx_ttfExport *e, ttfOutliner *o)
{
/* Not completed yet. */
gs_gstate gs_stub;
gx_fill_params params;
gx_device_color devc_stub;
int code;
t1_hinter_aux h;
gs_matrix m, fm, fmb;
gs_matrix_fixed ctm_temp;
bool atp = gs_currentaligntopixels(pfont->dir);
int FontType = 1; /* Will apply Type 1 hinter. */
fixed sbx = 0, sby = 0; /* stub */
double scale = 1.0 / o->pFont->nUnitsPerEm;
gs_fixed_rect bbox;
m.xx = o->post_transform.a;
m.xy = o->post_transform.b;
m.yx = o->post_transform.c;
m.yy = o->post_transform.d;
m.tx = o->post_transform.tx;
m.ty = o->post_transform.ty;
code = gs_matrix_fixed_from_matrix(&ctm_temp, &m);
if (code < 0)
return code;
code = gs_matrix_scale(&pfont->FontMatrix, scale, scale, &fm);
if (code < 0)
return code;
code = gs_matrix_scale(&pfont->base->FontMatrix, scale, scale, &fmb);
if (code < 0)
return code;
t1_hinter__init(&h.super, path); /* Will export to */
code = t1_hinter__set_mapping(&h.super, &ctm_temp,
&fm, &fmb,
pscale->x, pscale->x, 0, 0,
ctm_temp.tx_fixed, ctm_temp.ty_fixed, atp);
if (code < 0)
return code;
if (!h.super.disable_hinting) {
o->post_transform.a = o->post_transform.d = 1;
o->post_transform.b = o->post_transform.c = 0;
o->post_transform.tx = o->post_transform.ty = 0;
ttfOutliner__DrawGlyphOutline(o);
if (e->error < 0)
return e->error;
code = t1_hinter__set_font42_data(&h.super, FontType, &pfont->data, false);
if (code < 0)
return code;
code = t1_hinter__sbw(&h.super, sbx, sby, e->w.x, e->w.y);
if (code < 0)
return code;
code = gx_path_bbox(path, &bbox);
if (code < 0)
return code;
memset(&gs_stub, 0, sizeof(gs_stub));
gs_stub.memory = padev->memory;
set_nonclient_dev_color(&devc_stub, 1);
params.rule = gx_rule_winding_number;
params.adjust.x = params.adjust.y = 0;
params.flatness = fixed2float(max(bbox.q.x - bbox.p.x, bbox.q.y - bbox.p.y)) / 100.0;
for (h.transpose = 0; h.transpose < 2; h.transpose++) {
h.midx = (padev->xmin + padev->xmax) / 2;
if (h.transpose)
transpose_path(path);
gx_san_begin(padev);
code = dev_proc(padev, fill_path)((gx_device *)padev,
&gs_stub, path, ¶ms, &devc_stub, NULL);
gx_san_end(padev);
if (code >= 0)
code = gx_san_generate_stems(padev, OVERALL_HINT && h.transpose,
&h, stem_hint_handler);
if (h.transpose)
transpose_path(path);
if (code < 0)
return code;
}
/* fixme : Storing hints permanently would be useful.
Note that if (gftt & 1), the outline and hints are already scaled.
*/
code = path_to_hinter(&h.super, path);
if (code < 0)
return code;
code = gx_path_new(path);
if (code < 0)
return code;
code = t1_hinter__endglyph(&h.super);
} else {
ttfOutliner__DrawGlyphOutline(o);
if (e->error < 0)
return e->error;
}
return code;
}
int gx_ttf_outline(ttfFont *ttf, gx_ttfReader *r, gs_font_type42 *pfont, int glyph_index,
const gs_matrix *m, const gs_log2_scale_point *pscale,
gx_path *path, bool design_grid)
{
gx_ttfExport e;
ttfOutliner o;
gs_point char_size, subpix_origin;
gs_matrix post_transform;
/* Ghostscript proceses a TTC index in gs/lib/gs_ttf.ps, */
/* so that TTC never comes here. */
FloatMatrix m1;
bool dg;
uint gftt = gs_currentgridfittt(pfont->dir);
bool ttin = (gftt & 1);
/* gs_currentgridfittt values (binary) :
00 - no grid fitting;
01 - Grid fit with TT interpreter; On failure warn and render unhinted.
10 - Interpret in the design grid and then autohint.
11 - Grid fit with TT interpreter; On failure render autohinted.
*/
bool auth = (gftt & 2);
decompose_matrix(pfont, m, pscale, design_grid, &char_size, &subpix_origin, &post_transform, &dg);
m1.a = post_transform.xx;
m1.b = post_transform.xy;
m1.c = post_transform.yx;
m1.d = post_transform.yy;
m1.tx = post_transform.tx;
m1.ty = post_transform.ty;
e.super.bPoints = false;
e.super.bOutline = true;
e.super.MoveTo = gx_ttfExport__MoveTo;
e.super.LineTo = gx_ttfExport__LineTo;
e.super.CurveTo = gx_ttfExport__CurveTo;
e.super.Close = gx_ttfExport__Close;
e.super.Point = gx_ttfExport__Point;
e.super.SetWidth = gx_ttfExport__SetWidth;
e.super.DebugPaint = gx_ttfExport__DebugPaint;
e.error = 0;
e.path = path;
e.w.x = 0;
e.w.y = 0;
e.monotonize = auth;
gx_ttfReader__Reset(r);
ttfOutliner__init(&o, ttf, &r->super, &e.super, true, false, pfont->WMode != 0);
switch(ttfOutliner__Outline(&o, glyph_index, subpix_origin.x, subpix_origin.y, &m1)) {
case fBadInstruction:
WarnBadInstruction(pfont, glyph_index);
goto recover;
case fPatented:
/* The returned outline did not apply a bytecode (it is not grid-fitted). */
if (!auth)
WarnPatented(pfont, ttf, "Some glyphs of the font");
recover :
if (!design_grid && auth)
return grid_fit(pfont->dir->san, path, pfont, pscale, &e, &o);
/* Falls through. */
case fNoError:
if (!design_grid && !ttin && auth)
return grid_fit(pfont->dir->san, path, pfont, pscale, &e, &o);
ttfOutliner__DrawGlyphOutline(&o);
if (e.error)
return e.error;
return 0;
case fMemoryError:
return_error(gs_error_VMerror);
case fUnimplemented:
return_error(gs_error_unregistered);
default:
{ int code = r->super.Error(&r->super);
if (code < 0)
return code;
return_error(gs_error_invalidfont);
}
}
}
|