/
image.c
8575 lines (7090 loc) · 219 KB
/
image.c
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
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* Functions for image support on window system.
Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdio.h>
#include <math.h>
#include <ctype.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_PNG
#if defined HAVE_LIBPNG_PNG_H
# include <libpng/png.h>
#else
# include <png.h>
#endif
#endif
#include <setjmp.h>
/* This makes the fields of a Display accessible, in Xlib header files. */
#define XLIB_ILLEGAL_ACCESS
#include "lisp.h"
#include "frame.h"
#include "window.h"
#include "dispextern.h"
#include "blockinput.h"
#include "systime.h"
#include <epaths.h>
#include "character.h"
#include "coding.h"
#include "termhooks.h"
#include "font.h"
#ifdef HAVE_X_WINDOWS
#include "xterm.h"
#include <sys/types.h>
#include <sys/stat.h>
#define COLOR_TABLE_SUPPORT 1
typedef struct x_bitmap_record Bitmap_Record;
#define GET_PIXEL(ximg, x, y) XGetPixel(ximg, x, y)
#define NO_PIXMAP None
#define RGB_PIXEL_COLOR unsigned long
#define PIX_MASK_RETAIN 0
#define PIX_MASK_DRAW 1
#endif /* HAVE_X_WINDOWS */
#ifdef HAVE_NTGUI
#include "w32term.h"
/* W32_TODO : Color tables on W32. */
#undef COLOR_TABLE_SUPPORT
typedef struct w32_bitmap_record Bitmap_Record;
#define GET_PIXEL(ximg, x, y) GetPixel(ximg, x, y)
#define NO_PIXMAP 0
#define RGB_PIXEL_COLOR COLORREF
#define PIX_MASK_RETAIN 0
#define PIX_MASK_DRAW 1
#define FRAME_X_VISUAL(f) FRAME_X_DISPLAY_INFO (f)->visual
#define x_defined_color w32_defined_color
#define DefaultDepthOfScreen(screen) (one_w32_display_info.n_cbits)
/* Functions from w32term.c that depend on XColor (so can't go in w32term.h
without modifying lots of files). */
extern void x_query_colors (struct frame *f, XColor *colors, int ncolors);
extern void x_query_color (struct frame *f, XColor *color);
/* Version of libpng that we were compiled with, or -1 if no PNG
support was compiled in. This is tested by w32-win.el to correctly
set up the alist used to search for PNG libraries. */
Lisp_Object Qlibpng_version;
#endif /* HAVE_NTGUI */
#ifdef HAVE_NS
#include "nsterm.h"
#include <sys/types.h>
#include <sys/stat.h>
#undef COLOR_TABLE_SUPPORT
typedef struct ns_bitmap_record Bitmap_Record;
#define GET_PIXEL(ximg, x, y) XGetPixel(ximg, x, y)
#define NO_PIXMAP 0
#define RGB_PIXEL_COLOR unsigned long
#define ZPixmap 0
#define PIX_MASK_RETAIN 0
#define PIX_MASK_DRAW 1
#define FRAME_X_VISUAL FRAME_NS_DISPLAY_INFO(f)->visual
#define x_defined_color(f, name, color_def, alloc) \
ns_defined_color (f, name, color_def, alloc, 0)
#define FRAME_X_SCREEN(f) 0
#define DefaultDepthOfScreen(screen) x_display_list->n_planes
#endif /* HAVE_NS */
/* Search path for bitmap files. */
Lisp_Object Vx_bitmap_file_path;
static void x_disable_image P_ ((struct frame *, struct image *));
static void x_edge_detection P_ ((struct frame *, struct image *, Lisp_Object,
Lisp_Object));
static void init_color_table P_ ((void));
static unsigned long lookup_rgb_color P_ ((struct frame *f, int r, int g, int b));
#ifdef COLOR_TABLE_SUPPORT
static void free_color_table P_ ((void));
static unsigned long *colors_in_color_table P_ ((int *n));
static unsigned long lookup_pixel_color P_ ((struct frame *f, unsigned long p));
#endif
/* Code to deal with bitmaps. Bitmaps are referenced by their bitmap
id, which is just an int that this section returns. Bitmaps are
reference counted so they can be shared among frames.
Bitmap indices are guaranteed to be > 0, so a negative number can
be used to indicate no bitmap.
If you use x_create_bitmap_from_data, then you must keep track of
the bitmaps yourself. That is, creating a bitmap from the same
data more than once will not be caught. */
#ifdef HAVE_NS
XImagePtr
XGetImage (Display *display, Pixmap pixmap, int x, int y,
unsigned int width, unsigned int height,
unsigned long plane_mask, int format)
{
/* TODO: not sure what this function is supposed to do.. */
ns_retain_object(pixmap);
return pixmap;
}
/* use with imgs created by ns_image_for_XPM */
unsigned long
XGetPixel (XImagePtr ximage, int x, int y)
{
return ns_get_pixel(ximage, x, y);
}
/* use with imgs created by ns_image_for_XPM; alpha set to 1;
pixel is assumed to be in form RGB */
void
XPutPixel (XImagePtr ximage, int x, int y, unsigned long pixel)
{
ns_put_pixel(ximage, x, y, pixel);
}
#endif /* HAVE_NS */
/* Functions to access the contents of a bitmap, given an id. */
int
x_bitmap_height (f, id)
FRAME_PTR f;
int id;
{
return FRAME_X_DISPLAY_INFO (f)->bitmaps[id - 1].height;
}
int
x_bitmap_width (f, id)
FRAME_PTR f;
int id;
{
return FRAME_X_DISPLAY_INFO (f)->bitmaps[id - 1].width;
}
#if defined (HAVE_X_WINDOWS) || defined (HAVE_NTGUI)
int
x_bitmap_pixmap (f, id)
FRAME_PTR f;
int id;
{
return (int) FRAME_X_DISPLAY_INFO (f)->bitmaps[id - 1].pixmap;
}
#endif
#ifdef HAVE_X_WINDOWS
int
x_bitmap_mask (f, id)
FRAME_PTR f;
int id;
{
return FRAME_X_DISPLAY_INFO (f)->bitmaps[id - 1].mask;
}
#endif
/* Allocate a new bitmap record. Returns index of new record. */
static int
x_allocate_bitmap_record (f)
FRAME_PTR f;
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
int i;
if (dpyinfo->bitmaps == NULL)
{
dpyinfo->bitmaps_size = 10;
dpyinfo->bitmaps
= (Bitmap_Record *) xmalloc (dpyinfo->bitmaps_size * sizeof (Bitmap_Record));
dpyinfo->bitmaps_last = 1;
return 1;
}
if (dpyinfo->bitmaps_last < dpyinfo->bitmaps_size)
return ++dpyinfo->bitmaps_last;
for (i = 0; i < dpyinfo->bitmaps_size; ++i)
if (dpyinfo->bitmaps[i].refcount == 0)
return i + 1;
dpyinfo->bitmaps_size *= 2;
dpyinfo->bitmaps
= (Bitmap_Record *) xrealloc (dpyinfo->bitmaps,
dpyinfo->bitmaps_size * sizeof (Bitmap_Record));
return ++dpyinfo->bitmaps_last;
}
/* Add one reference to the reference count of the bitmap with id ID. */
void
x_reference_bitmap (f, id)
FRAME_PTR f;
int id;
{
++FRAME_X_DISPLAY_INFO (f)->bitmaps[id - 1].refcount;
}
/* Create a bitmap for frame F from a HEIGHT x WIDTH array of bits at BITS. */
int
x_create_bitmap_from_data (f, bits, width, height)
struct frame *f;
char *bits;
unsigned int width, height;
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
int id;
#ifdef HAVE_X_WINDOWS
Pixmap bitmap;
bitmap = XCreateBitmapFromData (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
bits, width, height);
if (! bitmap)
return -1;
#endif /* HAVE_X_WINDOWS */
#ifdef HAVE_NTGUI
Pixmap bitmap;
bitmap = CreateBitmap (width, height,
FRAME_X_DISPLAY_INFO (XFRAME (frame))->n_planes,
FRAME_X_DISPLAY_INFO (XFRAME (frame))->n_cbits,
bits);
if (! bitmap)
return -1;
#endif /* HAVE_NTGUI */
#ifdef HAVE_NS
void *bitmap = ns_image_from_XBM(bits, width, height);
if (!bitmap)
return -1;
#endif
id = x_allocate_bitmap_record (f);
#ifdef HAVE_NS
dpyinfo->bitmaps[id - 1].img = bitmap;
dpyinfo->bitmaps[id - 1].depth = 1;
#endif
dpyinfo->bitmaps[id - 1].file = NULL;
dpyinfo->bitmaps[id - 1].height = height;
dpyinfo->bitmaps[id - 1].width = width;
dpyinfo->bitmaps[id - 1].refcount = 1;
#ifdef HAVE_X_WINDOWS
dpyinfo->bitmaps[id - 1].pixmap = bitmap;
dpyinfo->bitmaps[id - 1].have_mask = 0;
dpyinfo->bitmaps[id - 1].depth = 1;
#endif /* HAVE_X_WINDOWS */
#ifdef HAVE_NTGUI
dpyinfo->bitmaps[id - 1].pixmap = bitmap;
dpyinfo->bitmaps[id - 1].hinst = NULL;
dpyinfo->bitmaps[id - 1].depth = 1;
#endif /* HAVE_NTGUI */
return id;
}
/* Create bitmap from file FILE for frame F. */
int
x_create_bitmap_from_file (f, file)
struct frame *f;
Lisp_Object file;
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
#ifdef HAVE_NTGUI
return -1; /* W32_TODO : bitmap support */
#endif /* HAVE_NTGUI */
#ifdef HAVE_NS
int id;
void *bitmap = ns_image_from_file(file);
if (!bitmap)
return -1;
id = x_allocate_bitmap_record (f);
dpyinfo->bitmaps[id - 1].img = bitmap;
dpyinfo->bitmaps[id - 1].refcount = 1;
dpyinfo->bitmaps[id - 1].file = (char *) xmalloc (SBYTES (file) + 1);
dpyinfo->bitmaps[id - 1].depth = 1;
dpyinfo->bitmaps[id - 1].height = ns_image_width(bitmap);
dpyinfo->bitmaps[id - 1].width = ns_image_height(bitmap);
strcpy (dpyinfo->bitmaps[id - 1].file, SDATA (file));
return id;
#endif
#ifdef HAVE_X_WINDOWS
unsigned int width, height;
Pixmap bitmap;
int xhot, yhot, result, id;
Lisp_Object found;
int fd;
char *filename;
/* Look for an existing bitmap with the same name. */
for (id = 0; id < dpyinfo->bitmaps_last; ++id)
{
if (dpyinfo->bitmaps[id].refcount
&& dpyinfo->bitmaps[id].file
&& !strcmp (dpyinfo->bitmaps[id].file, (char *) SDATA (file)))
{
++dpyinfo->bitmaps[id].refcount;
return id + 1;
}
}
/* Search bitmap-file-path for the file, if appropriate. */
fd = openp (Vx_bitmap_file_path, file, Qnil, &found, Qnil);
if (fd < 0)
return -1;
emacs_close (fd);
filename = (char *) SDATA (found);
result = XReadBitmapFile (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
filename, &width, &height, &bitmap, &xhot, &yhot);
if (result != BitmapSuccess)
return -1;
id = x_allocate_bitmap_record (f);
dpyinfo->bitmaps[id - 1].pixmap = bitmap;
dpyinfo->bitmaps[id - 1].have_mask = 0;
dpyinfo->bitmaps[id - 1].refcount = 1;
dpyinfo->bitmaps[id - 1].file = (char *) xmalloc (SBYTES (file) + 1);
dpyinfo->bitmaps[id - 1].depth = 1;
dpyinfo->bitmaps[id - 1].height = height;
dpyinfo->bitmaps[id - 1].width = width;
strcpy (dpyinfo->bitmaps[id - 1].file, SDATA (file));
return id;
#endif /* HAVE_X_WINDOWS */
}
/* Free bitmap B. */
static void
free_bitmap_record (dpyinfo, bm)
Display_Info *dpyinfo;
Bitmap_Record *bm;
{
#ifdef HAVE_X_WINDOWS
XFreePixmap (dpyinfo->display, bm->pixmap);
if (bm->have_mask)
XFreePixmap (dpyinfo->display, bm->mask);
#endif /* HAVE_X_WINDOWS */
#ifdef HAVE_NTGUI
DeleteObject (bm->pixmap);
#endif /* HAVE_NTGUI */
#ifdef HAVE_NS
ns_release_object(bm->img);
#endif
if (bm->file)
{
xfree (bm->file);
bm->file = NULL;
}
}
/* Remove reference to bitmap with id number ID. */
void
x_destroy_bitmap (f, id)
FRAME_PTR f;
int id;
{
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
if (id > 0)
{
Bitmap_Record *bm = &dpyinfo->bitmaps[id - 1];
if (--bm->refcount == 0)
{
BLOCK_INPUT;
free_bitmap_record (dpyinfo, bm);
UNBLOCK_INPUT;
}
}
}
/* Free all the bitmaps for the display specified by DPYINFO. */
void
x_destroy_all_bitmaps (dpyinfo)
Display_Info *dpyinfo;
{
int i;
Bitmap_Record *bm = dpyinfo->bitmaps;
for (i = 0; i < dpyinfo->bitmaps_last; i++, bm++)
if (bm->refcount > 0)
free_bitmap_record (dpyinfo, bm);
dpyinfo->bitmaps_last = 0;
}
#ifdef HAVE_X_WINDOWS
/* Useful functions defined in the section
`Image type independent image structures' below. */
static unsigned long four_corners_best P_ ((XImagePtr ximg,
int *corners,
unsigned long width,
unsigned long height));
static int x_create_x_image_and_pixmap P_ ((struct frame *f, int width, int height,
int depth, XImagePtr *ximg,
Pixmap *pixmap));
static void x_destroy_x_image P_ ((XImagePtr ximg));
/* Create a mask of a bitmap. Note is this not a perfect mask.
It's nicer with some borders in this context */
int
x_create_bitmap_mask (f, id)
struct frame *f;
int id;
{
Pixmap pixmap, mask;
XImagePtr ximg, mask_img;
unsigned long width, height;
int result;
unsigned long bg;
unsigned long x, y, xp, xm, yp, ym;
GC gc;
Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
if (!(id > 0))
return -1;
pixmap = x_bitmap_pixmap (f, id);
width = x_bitmap_width (f, id);
height = x_bitmap_height (f, id);
BLOCK_INPUT;
ximg = XGetImage (FRAME_X_DISPLAY (f), pixmap, 0, 0, width, height,
~0, ZPixmap);
if (!ximg)
{
UNBLOCK_INPUT;
return -1;
}
result = x_create_x_image_and_pixmap (f, width, height, 1, &mask_img, &mask);
UNBLOCK_INPUT;
if (!result)
{
XDestroyImage (ximg);
return -1;
}
bg = four_corners_best (ximg, NULL, width, height);
for (y = 0; y < ximg->height; ++y)
{
for (x = 0; x < ximg->width; ++x)
{
xp = x != ximg->width - 1 ? x + 1 : 0;
xm = x != 0 ? x - 1 : ximg->width - 1;
yp = y != ximg->height - 1 ? y + 1 : 0;
ym = y != 0 ? y - 1 : ximg->height - 1;
if (XGetPixel (ximg, x, y) == bg
&& XGetPixel (ximg, x, yp) == bg
&& XGetPixel (ximg, x, ym) == bg
&& XGetPixel (ximg, xp, y) == bg
&& XGetPixel (ximg, xp, yp) == bg
&& XGetPixel (ximg, xp, ym) == bg
&& XGetPixel (ximg, xm, y) == bg
&& XGetPixel (ximg, xm, yp) == bg
&& XGetPixel (ximg, xm, ym) == bg)
XPutPixel (mask_img, x, y, 0);
else
XPutPixel (mask_img, x, y, 1);
}
}
xassert (interrupt_input_blocked);
gc = XCreateGC (FRAME_X_DISPLAY (f), mask, 0, NULL);
XPutImage (FRAME_X_DISPLAY (f), mask, gc, mask_img, 0, 0, 0, 0,
width, height);
XFreeGC (FRAME_X_DISPLAY (f), gc);
dpyinfo->bitmaps[id - 1].have_mask = 1;
dpyinfo->bitmaps[id - 1].mask = mask;
XDestroyImage (ximg);
x_destroy_x_image (mask_img);
return 0;
}
#endif /* HAVE_X_WINDOWS */
/***********************************************************************
Image types
***********************************************************************/
/* Value is the number of elements of vector VECTOR. */
#define DIM(VECTOR) (sizeof (VECTOR) / sizeof *(VECTOR))
/* List of supported image types. Use define_image_type to add new
types. Use lookup_image_type to find a type for a given symbol. */
static struct image_type *image_types;
/* A list of symbols, one for each supported image type. */
Lisp_Object Vimage_types;
/* An alist of image types and libraries that implement the type. */
Lisp_Object Vimage_library_alist;
/* Cache for delayed-loading image types. */
static Lisp_Object Vimage_type_cache;
/* The symbol `xbm' which is used as the type symbol for XBM images. */
Lisp_Object Qxbm;
/* Keywords. */
extern Lisp_Object QCwidth, QCheight, QCforeground, QCbackground, QCfile;
extern Lisp_Object QCdata, QCtype;
extern Lisp_Object Qcenter;
Lisp_Object QCascent, QCmargin, QCrelief, Qcount;
Lisp_Object QCconversion, QCcolor_symbols, QCheuristic_mask;
Lisp_Object QCindex, QCmatrix, QCcolor_adjustment, QCmask;
/* Other symbols. */
Lisp_Object Qlaplace, Qemboss, Qedge_detection, Qheuristic;
/* Time in seconds after which images should be removed from the cache
if not displayed. */
Lisp_Object Vimage_cache_eviction_delay;
/* Function prototypes. */
static Lisp_Object define_image_type P_ ((struct image_type *type, int loaded));
static struct image_type *lookup_image_type P_ ((Lisp_Object symbol));
static void image_error P_ ((char *format, Lisp_Object, Lisp_Object));
static void x_laplace P_ ((struct frame *, struct image *));
static void x_emboss P_ ((struct frame *, struct image *));
static int x_build_heuristic_mask P_ ((struct frame *, struct image *,
Lisp_Object));
#define CACHE_IMAGE_TYPE(type, status) \
do { Vimage_type_cache = Fcons (Fcons (type, status), Vimage_type_cache); } while (0)
#define ADD_IMAGE_TYPE(type) \
do { Vimage_types = Fcons (type, Vimage_types); } while (0)
/* Define a new image type from TYPE. This adds a copy of TYPE to
image_types and caches the loading status of TYPE. */
static Lisp_Object
define_image_type (type, loaded)
struct image_type *type;
int loaded;
{
Lisp_Object success;
if (!loaded)
success = Qnil;
else
{
/* Make a copy of TYPE to avoid a bus error in a dumped Emacs.
The initialized data segment is read-only. */
struct image_type *p = (struct image_type *) xmalloc (sizeof *p);
bcopy (type, p, sizeof *p);
p->next = image_types;
image_types = p;
success = Qt;
}
CACHE_IMAGE_TYPE (*type->type, success);
return success;
}
/* Look up image type SYMBOL, and return a pointer to its image_type
structure. Value is null if SYMBOL is not a known image type. */
static INLINE struct image_type *
lookup_image_type (symbol)
Lisp_Object symbol;
{
struct image_type *type;
/* We must initialize the image-type if it hasn't been already. */
if (NILP (Finit_image_library (symbol, Vimage_library_alist)))
return 0; /* unimplemented */
for (type = image_types; type; type = type->next)
if (EQ (symbol, *type->type))
break;
return type;
}
/* Value is non-zero if OBJECT is a valid Lisp image specification. A
valid image specification is a list whose car is the symbol
`image', and whose rest is a property list. The property list must
contain a value for key `:type'. That value must be the name of a
supported image type. The rest of the property list depends on the
image type. */
int
valid_image_p (object)
Lisp_Object object;
{
int valid_p = 0;
if (IMAGEP (object))
{
Lisp_Object tem;
for (tem = XCDR (object); CONSP (tem); tem = XCDR (tem))
if (EQ (XCAR (tem), QCtype))
{
tem = XCDR (tem);
if (CONSP (tem) && SYMBOLP (XCAR (tem)))
{
struct image_type *type;
type = lookup_image_type (XCAR (tem));
if (type)
valid_p = type->valid_p (object);
}
break;
}
}
return valid_p;
}
/* Log error message with format string FORMAT and argument ARG.
Signaling an error, e.g. when an image cannot be loaded, is not a
good idea because this would interrupt redisplay, and the error
message display would lead to another redisplay. This function
therefore simply displays a message. */
static void
image_error (format, arg1, arg2)
char *format;
Lisp_Object arg1, arg2;
{
add_to_log (format, arg1, arg2);
}
/***********************************************************************
Image specifications
***********************************************************************/
enum image_value_type
{
IMAGE_DONT_CHECK_VALUE_TYPE,
IMAGE_STRING_VALUE,
IMAGE_STRING_OR_NIL_VALUE,
IMAGE_SYMBOL_VALUE,
IMAGE_POSITIVE_INTEGER_VALUE,
IMAGE_POSITIVE_INTEGER_VALUE_OR_PAIR,
IMAGE_NON_NEGATIVE_INTEGER_VALUE,
IMAGE_ASCENT_VALUE,
IMAGE_INTEGER_VALUE,
IMAGE_FUNCTION_VALUE,
IMAGE_NUMBER_VALUE,
IMAGE_BOOL_VALUE
};
/* Structure used when parsing image specifications. */
struct image_keyword
{
/* Name of keyword. */
char *name;
/* The type of value allowed. */
enum image_value_type type;
/* Non-zero means key must be present. */
int mandatory_p;
/* Used to recognize duplicate keywords in a property list. */
int count;
/* The value that was found. */
Lisp_Object value;
};
static int parse_image_spec P_ ((Lisp_Object, struct image_keyword *,
int, Lisp_Object));
static Lisp_Object image_spec_value P_ ((Lisp_Object, Lisp_Object, int *));
/* Parse image spec SPEC according to KEYWORDS. A valid image spec
has the format (image KEYWORD VALUE ...). One of the keyword/
value pairs must be `:type TYPE'. KEYWORDS is a vector of
image_keywords structures of size NKEYWORDS describing other
allowed keyword/value pairs. Value is non-zero if SPEC is valid. */
static int
parse_image_spec (spec, keywords, nkeywords, type)
Lisp_Object spec;
struct image_keyword *keywords;
int nkeywords;
Lisp_Object type;
{
int i;
Lisp_Object plist;
if (!IMAGEP (spec))
return 0;
plist = XCDR (spec);
while (CONSP (plist))
{
Lisp_Object key, value;
/* First element of a pair must be a symbol. */
key = XCAR (plist);
plist = XCDR (plist);
if (!SYMBOLP (key))
return 0;
/* There must follow a value. */
if (!CONSP (plist))
return 0;
value = XCAR (plist);
plist = XCDR (plist);
/* Find key in KEYWORDS. Error if not found. */
for (i = 0; i < nkeywords; ++i)
if (strcmp (keywords[i].name, SDATA (SYMBOL_NAME (key))) == 0)
break;
if (i == nkeywords)
continue;
/* Record that we recognized the keyword. If a keywords
was found more than once, it's an error. */
keywords[i].value = value;
++keywords[i].count;
if (keywords[i].count > 1)
return 0;
/* Check type of value against allowed type. */
switch (keywords[i].type)
{
case IMAGE_STRING_VALUE:
if (!STRINGP (value))
return 0;
break;
case IMAGE_STRING_OR_NIL_VALUE:
if (!STRINGP (value) && !NILP (value))
return 0;
break;
case IMAGE_SYMBOL_VALUE:
if (!SYMBOLP (value))
return 0;
break;
case IMAGE_POSITIVE_INTEGER_VALUE:
if (!INTEGERP (value) || XINT (value) <= 0)
return 0;
break;
case IMAGE_POSITIVE_INTEGER_VALUE_OR_PAIR:
if (INTEGERP (value) && XINT (value) >= 0)
break;
if (CONSP (value)
&& INTEGERP (XCAR (value)) && INTEGERP (XCDR (value))
&& XINT (XCAR (value)) >= 0 && XINT (XCDR (value)) >= 0)
break;
return 0;
case IMAGE_ASCENT_VALUE:
if (SYMBOLP (value) && EQ (value, Qcenter))
break;
else if (INTEGERP (value)
&& XINT (value) >= 0
&& XINT (value) <= 100)
break;
return 0;
case IMAGE_NON_NEGATIVE_INTEGER_VALUE:
if (!INTEGERP (value) || XINT (value) < 0)
return 0;
break;
case IMAGE_DONT_CHECK_VALUE_TYPE:
break;
case IMAGE_FUNCTION_VALUE:
value = indirect_function (value);
if (SUBRP (value)
|| COMPILEDP (value)
|| (CONSP (value) && EQ (XCAR (value), Qlambda)))
break;
return 0;
case IMAGE_NUMBER_VALUE:
if (!INTEGERP (value) && !FLOATP (value))
return 0;
break;
case IMAGE_INTEGER_VALUE:
if (!INTEGERP (value))
return 0;
break;
case IMAGE_BOOL_VALUE:
if (!NILP (value) && !EQ (value, Qt))
return 0;
break;
default:
abort ();
break;
}
if (EQ (key, QCtype) && !EQ (type, value))
return 0;
}
/* Check that all mandatory fields are present. */
for (i = 0; i < nkeywords; ++i)
if (keywords[i].mandatory_p && keywords[i].count == 0)
return 0;
return NILP (plist);
}
/* Return the value of KEY in image specification SPEC. Value is nil
if KEY is not present in SPEC. if FOUND is not null, set *FOUND
to 1 if KEY was found in SPEC, set it to 0 otherwise. */
static Lisp_Object
image_spec_value (spec, key, found)
Lisp_Object spec, key;
int *found;
{
Lisp_Object tail;
xassert (valid_image_p (spec));
for (tail = XCDR (spec);
CONSP (tail) && CONSP (XCDR (tail));
tail = XCDR (XCDR (tail)))
{
if (EQ (XCAR (tail), key))
{
if (found)
*found = 1;
return XCAR (XCDR (tail));
}
}
if (found)
*found = 0;
return Qnil;
}
DEFUN ("image-size", Fimage_size, Simage_size, 1, 3, 0,
doc: /* Return the size of image SPEC as pair (WIDTH . HEIGHT).
PIXELS non-nil means return the size in pixels, otherwise return the
size in canonical character units.
FRAME is the frame on which the image will be displayed. FRAME nil
or omitted means use the selected frame. */)
(spec, pixels, frame)
Lisp_Object spec, pixels, frame;
{
Lisp_Object size;
size = Qnil;
if (valid_image_p (spec))
{
struct frame *f = check_x_frame (frame);
int id = lookup_image (f, spec);
struct image *img = IMAGE_FROM_ID (f, id);
int width = img->width + 2 * img->hmargin;
int height = img->height + 2 * img->vmargin;
if (NILP (pixels))
size = Fcons (make_float ((double) width / FRAME_COLUMN_WIDTH (f)),
make_float ((double) height / FRAME_LINE_HEIGHT (f)));
else
size = Fcons (make_number (width), make_number (height));
}
else
error ("Invalid image specification");
return size;
}
DEFUN ("image-mask-p", Fimage_mask_p, Simage_mask_p, 1, 2, 0,
doc: /* Return t if image SPEC has a mask bitmap.
FRAME is the frame on which the image will be displayed. FRAME nil
or omitted means use the selected frame. */)
(spec, frame)
Lisp_Object spec, frame;