/
IMG_xcf.c
900 lines (766 loc) · 22.3 KB
1
/*
2
SDL_image: An example image loading library for use with SDL
3
Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
4
5
6
7
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
8
9
10
11
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
12
13
14
15
16
17
18
19
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
20
21
22
23
*/
/* This is a XCF image file loading framework */
24
#include "SDL_endian.h"
25
26
27
28
#include "SDL_image.h"
#ifdef LOAD_XCF
29
#if DEBUG
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
static char prop_names [][30] = {
"end",
"colormap",
"active_layer",
"active_channel",
"selection",
"floating_selection",
"opacity",
"mode",
"visible",
"linked",
"preserve_transparency",
"apply_mask",
"edit_mask",
"show_mask",
"show_masked",
"offsets",
"color",
"compression",
"guides",
"resolution",
"tattoo",
"parasites",
"unit",
"paths",
"user_unit"
};
57
58
#endif
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
typedef enum
{
PROP_END = 0,
PROP_COLORMAP = 1,
PROP_ACTIVE_LAYER = 2,
PROP_ACTIVE_CHANNEL = 3,
PROP_SELECTION = 4,
PROP_FLOATING_SELECTION = 5,
PROP_OPACITY = 6,
PROP_MODE = 7,
PROP_VISIBLE = 8,
PROP_LINKED = 9,
PROP_PRESERVE_TRANSPARENCY = 10,
PROP_APPLY_MASK = 11,
PROP_EDIT_MASK = 12,
PROP_SHOW_MASK = 13,
PROP_SHOW_MASKED = 14,
PROP_OFFSETS = 15,
PROP_COLOR = 16,
PROP_COMPRESSION = 17,
PROP_GUIDES = 18,
PROP_RESOLUTION = 19,
PROP_TATTOO = 20,
PROP_PARASITES = 21,
PROP_UNIT = 22,
PROP_PATHS = 23,
PROP_USER_UNIT = 24
} xcf_prop_type;
typedef enum {
COMPR_NONE = 0,
COMPR_RLE = 1,
COMPR_ZLIB = 2,
COMPR_FRACTAL = 3
} xcf_compr_type;
typedef enum {
IMAGE_RGB = 0,
IMAGE_GREYSCALE = 1,
IMAGE_INDEXED = 2
} xcf_image_type;
typedef struct {
Uint32 id;
Uint32 length;
union {
struct {
Uint32 num;
char * cmap;
} colormap; // 1
struct {
Uint32 drawable_offset;
} floating_selection; // 5
Sint32 opacity;
Sint32 mode;
int visible;
int linked;
int preserve_transparency;
int apply_mask;
int show_mask;
struct {
Sint32 x;
Sint32 y;
} offset;
unsigned char color [3];
Uint8 compression;
struct {
Sint32 x;
Sint32 y;
} resolution;
struct {
char * name;
Uint32 flags;
Uint32 size;
char * data;
} parasite;
} data;
} xcf_prop;
typedef struct {
char sign [14];
Uint32 width;
Uint32 height;
Sint32 image_type;
xcf_prop * properties;
Uint32 * layer_file_offsets;
Uint32 * channel_file_offsets;
xcf_compr_type compr;
Uint32 cm_num;
unsigned char * cm_map;
} xcf_header;
typedef struct {
Uint32 width;
Uint32 height;
Sint32 layer_type;
char * name;
xcf_prop * properties;
Uint32 hierarchy_file_offset;
Uint32 layer_mask_offset;
Uint32 offset_x;
Uint32 offset_y;
166
int visible;
167
168
169
170
171
172
173
174
175
176
177
178
} xcf_layer;
typedef struct {
Uint32 width;
Uint32 height;
char * name;
xcf_prop * properties;
Uint32 hierarchy_file_offset;
Uint32 color;
Uint32 opacity;
179
180
int selection;
int visible;
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
} xcf_channel;
typedef struct {
Uint32 width;
Uint32 height;
Uint32 bpp;
Uint32 * level_file_offsets;
} xcf_hierarchy;
typedef struct {
Uint32 width;
Uint32 height;
Uint32 * tile_file_offsets;
} xcf_level;
typedef unsigned char * xcf_tile;
typedef unsigned char * (* load_tile_type) (SDL_RWops *, Uint32, int, int, int);
/* See if an image is contained in a data source */
204
205
int IMG_isXCF(SDL_RWops *src)
{
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
Sint64 start;
int is_XCF;
char magic[14];
if ( !src )
return 0;
start = SDL_RWtell(src);
is_XCF = 0;
if ( SDL_RWread(src, magic, sizeof(magic), 1) ) {
if (SDL_strncmp(magic, "gimp xcf ", 9) == 0) {
is_XCF = 1;
}
}
SDL_RWseek(src, start, RW_SEEK_SET);
return(is_XCF);
221
222
223
}
static char * read_string (SDL_RWops * src) {
224
Sint64 remaining;
225
226
227
Uint32 tmp;
char * data;
228
tmp = SDL_ReadBE32(src);
229
230
remaining = SDL_RWsize(src) - SDL_RWtell(src);
if (tmp > 0 && (Sint32)tmp <= remaining) {
231
data = (char *) SDL_malloc (sizeof (char) * tmp);
232
233
234
235
if (data) {
SDL_RWread(src, data, tmp, 1);
data[tmp - 1] = '\0';
}
236
237
}
else {
238
239
240
241
242
243
244
245
246
247
248
249
250
251
data = NULL;
}
return data;
}
static Uint32 Swap32 (Uint32 v) {
return
((v & 0x000000FF) << 16)
| ((v & 0x0000FF00))
| ((v & 0x00FF0000) >> 16)
| ((v & 0xFF000000));
}
252
static void xcf_read_property (SDL_RWops * src, xcf_prop * prop) {
253
Uint32 len;
254
255
256
prop->id = SDL_ReadBE32 (src);
prop->length = SDL_ReadBE32 (src);
257
#if DEBUG
258
printf ("%.8X: %s: %d\n", SDL_RWtell (src), prop->id < 25 ? prop_names [prop->id] : "unknown", prop->length);
259
#endif
260
261
262
263
switch (prop->id) {
case PROP_COLORMAP:
prop->data.colormap.num = SDL_ReadBE32 (src);
264
prop->data.colormap.cmap = (char *) SDL_malloc (sizeof (char) * prop->data.colormap.num * 3);
265
266
267
268
269
270
271
272
273
274
275
276
SDL_RWread (src, prop->data.colormap.cmap, prop->data.colormap.num*3, 1);
break;
case PROP_OFFSETS:
prop->data.offset.x = SDL_ReadBE32 (src);
prop->data.offset.y = SDL_ReadBE32 (src);
break;
case PROP_OPACITY:
prop->data.opacity = SDL_ReadBE32 (src);
break;
case PROP_COMPRESSION:
case PROP_COLOR:
277
278
279
280
281
282
if (prop->length > sizeof(prop->data)) {
len = sizeof(prop->data);
} else {
len = prop->length;
}
SDL_RWread(src, &prop->data, len, 1);
283
break;
284
285
286
case PROP_VISIBLE:
prop->data.visible = SDL_ReadBE32 (src);
break;
287
288
default:
// SDL_RWread (src, &prop->data, prop->length, 1);
289
SDL_RWseek (src, prop->length, RW_SEEK_CUR);
290
291
292
}
}
293
static void free_xcf_header (xcf_header * h) {
294
if (h->cm_num)
295
SDL_free (h->cm_map);
296
if (h->layer_file_offsets)
297
SDL_free (h->layer_file_offsets);
298
SDL_free (h);
299
300
}
301
static xcf_header * read_xcf_header (SDL_RWops * src) {
302
303
304
xcf_header * h;
xcf_prop prop;
305
h = (xcf_header *) SDL_malloc (sizeof (xcf_header));
306
307
308
if (!h) {
return NULL;
}
309
310
311
312
313
314
SDL_RWread (src, h->sign, 14, 1);
h->width = SDL_ReadBE32 (src);
h->height = SDL_ReadBE32 (src);
h->image_type = SDL_ReadBE32 (src);
h->properties = NULL;
315
h->layer_file_offsets = NULL;
316
317
318
319
320
321
322
323
h->compr = COMPR_NONE;
h->cm_num = 0;
h->cm_map = NULL;
// Just read, don't save
do {
xcf_read_property (src, &prop);
if (prop.id == PROP_COMPRESSION)
324
h->compr = (xcf_compr_type)prop.data.compression;
325
else if (prop.id == PROP_COLORMAP) {
326
// unused var: int i;
327
328
329
330
331
332
333
334
335
336
Uint32 cm_num;
unsigned char *cm_map;
cm_num = prop.data.colormap.num;
cm_map = (unsigned char *) SDL_realloc(h->cm_map, sizeof (unsigned char) * 3 * cm_num);
if (cm_map) {
h->cm_num = cm_num;
h->cm_map = cm_map;
SDL_memcpy (h->cm_map, prop.data.colormap.cmap, 3*sizeof (char)*h->cm_num);
}
337
SDL_free (prop.data.colormap.cmap);
338
339
340
341
342
if (!cm_map) {
free_xcf_header(h);
return NULL;
}
343
344
345
346
347
348
}
} while (prop.id != PROP_END);
return h;
}
349
static void free_xcf_layer (xcf_layer * l) {
350
351
SDL_free (l->name);
SDL_free (l);
352
353
}
354
static xcf_layer * read_xcf_layer (SDL_RWops * src) {
355
356
357
xcf_layer * l;
xcf_prop prop;
358
l = (xcf_layer *) SDL_malloc (sizeof (xcf_layer));
359
360
361
362
363
364
365
366
367
368
369
l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->layer_type = SDL_ReadBE32 (src);
l->name = read_string (src);
do {
xcf_read_property (src, &prop);
if (prop.id == PROP_OFFSETS) {
l->offset_x = prop.data.offset.x;
l->offset_y = prop.data.offset.y;
370
371
} else if (prop.id == PROP_VISIBLE) {
l->visible = prop.data.visible ? 1 : 0;
372
373
374
375
376
377
378
379
380
}
} while (prop.id != PROP_END);
l->hierarchy_file_offset = SDL_ReadBE32 (src);
l->layer_mask_offset = SDL_ReadBE32 (src);
return l;
}
381
static void free_xcf_channel (xcf_channel * c) {
382
383
SDL_free (c->name);
SDL_free (c);
384
385
}
386
static xcf_channel * read_xcf_channel (SDL_RWops * src) {
387
388
389
xcf_channel * l;
xcf_prop prop;
390
l = (xcf_channel *) SDL_malloc (sizeof (xcf_channel));
391
392
393
394
395
396
397
398
399
400
401
402
403
404
l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->name = read_string (src);
l->selection = 0;
do {
xcf_read_property (src, &prop);
switch (prop.id) {
case PROP_OPACITY:
l->opacity = prop.data.opacity << 24;
break;
case PROP_COLOR:
l->color = ((Uint32) prop.data.color[0] << 16)
405
406
| ((Uint32) prop.data.color[1] << 8)
| ((Uint32) prop.data.color[2]);
407
408
409
410
break;
case PROP_SELECTION:
l->selection = 1;
break;
411
412
413
case PROP_VISIBLE:
l->visible = prop.data.visible ? 1 : 0;
break;
414
default:
415
;
416
417
418
419
420
421
422
423
}
} while (prop.id != PROP_END);
l->hierarchy_file_offset = SDL_ReadBE32 (src);
return l;
}
424
static void free_xcf_hierarchy (xcf_hierarchy * h) {
425
426
SDL_free (h->level_file_offsets);
SDL_free (h);
427
428
}
429
static xcf_hierarchy * read_xcf_hierarchy (SDL_RWops * src) {
430
431
432
xcf_hierarchy * h;
int i;
433
h = (xcf_hierarchy *) SDL_malloc (sizeof (xcf_hierarchy));
434
435
436
437
438
439
440
h->width = SDL_ReadBE32 (src);
h->height = SDL_ReadBE32 (src);
h->bpp = SDL_ReadBE32 (src);
h->level_file_offsets = NULL;
i = 0;
do {
441
h->level_file_offsets = (Uint32 *) SDL_realloc (h->level_file_offsets, sizeof (Uint32) * (i+1));
442
443
444
445
446
447
h->level_file_offsets [i] = SDL_ReadBE32 (src);
} while (h->level_file_offsets [i++]);
return h;
}
448
static void free_xcf_level (xcf_level * l) {
449
450
SDL_free (l->tile_file_offsets);
SDL_free (l);
451
452
}
453
static xcf_level * read_xcf_level (SDL_RWops * src) {
454
455
456
xcf_level * l;
int i;
457
l = (xcf_level *) SDL_malloc (sizeof (xcf_level));
458
459
460
461
462
463
l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->tile_file_offsets = NULL;
i = 0;
do {
464
l->tile_file_offsets = (Uint32 *) SDL_realloc (l->tile_file_offsets, sizeof (Uint32) * (i+1));
465
466
467
468
469
470
l->tile_file_offsets [i] = SDL_ReadBE32 (src);
} while (l->tile_file_offsets [i++]);
return l;
}
471
static void free_xcf_tile (unsigned char * t) {
472
SDL_free (t);
473
474
}
475
static unsigned char * load_xcf_tile_none (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
476
477
unsigned char * load;
478
load = (unsigned char *) SDL_malloc (len); // expect this is okay
479
480
481
482
483
SDL_RWread (src, load, len, 1);
return load;
}
484
static unsigned char * load_xcf_tile_rle (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
485
486
487
488
489
unsigned char * load, * t, * data, * d;
Uint32 reallen;
int i, size, count, j, length;
unsigned char val;
490
491
492
493
if (len == 0) { /* probably bogus data. */
return NULL;
}
494
t = load = (unsigned char *) SDL_malloc (len);
495
496
reallen = SDL_RWread (src, t, 1, len);
497
data = (unsigned char *) SDL_calloc (1, x*y*bpp);
498
499
500
501
for (i = 0; i < bpp; i++) {
d = data + i;
size = x*y;
count = 0;
502
503
504
505
506
507
while (size > 0) {
val = *t++;
length = val;
if (length >= 128) {
508
509
510
511
512
length = 255 - (length - 1);
if (length == 128) {
length = (*t << 8) + t[1];
t += 2;
}
513
514
515
516
517
518
519
if (((size_t) (t - load) + length) >= len) {
break; /* bogus data */
} else if (length > size) {
break; /* bogus data */
}
520
521
count += length;
size -= length;
522
523
524
525
526
527
528
529
530
531
532
while (length-- > 0) {
*d = *t++;
d += bpp;
}
} else {
length += 1;
if (length == 128) {
length = (*t << 8) + t[1];
t += 2;
}
533
534
535
536
537
538
539
if (((size_t) (t - load)) >= len) {
break; /* bogus data */
} else if (length > size) {
break; /* bogus data */
}
540
541
count += length;
size -= length;
542
543
val = *t++;
544
545
546
547
548
for (j = 0; j < length; j++) {
*d = val;
d += bpp;
}
549
550
}
}
551
552
553
554
555
if (size > 0) {
break; /* just drop out, untouched data initialized to zero. */
}
556
557
}
558
SDL_free (load);
559
560
561
562
563
return (data);
}
static Uint32 rgb2grey (Uint32 a) {
Uint8 l;
564
565
566
l = (Uint8)(0.2990 * ((a & 0x00FF0000) >> 16)
+ 0.5870 * ((a & 0x0000FF00) >> 8)
+ 0.1140 * ((a & 0x000000FF)));
567
568
569
570
return (l << 16) | (l << 8) | l;
}
571
static void create_channel_surface (SDL_Surface * surf, xcf_image_type itype, Uint32 color, Uint32 opacity) {
572
Uint32 c = 0;
573
574
575
576
577
578
579
580
581
582
583
584
585
switch (itype) {
case IMAGE_RGB:
case IMAGE_INDEXED:
c = opacity | color;
break;
case IMAGE_GREYSCALE:
c = opacity | rgb2grey (color);
break;
}
SDL_FillRect (surf, NULL, c);
}
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
static int
do_layer_surface(SDL_Surface * surface, SDL_RWops * src, xcf_header * head, xcf_layer * layer, load_tile_type load_tile)
{
xcf_hierarchy *hierarchy;
xcf_level *level;
unsigned char *tile;
Uint8 *p8;
Uint16 *p16;
Uint32 *p;
int i, j;
Uint32 x, y, tx, ty, ox, oy;
Uint32 *row;
SDL_RWseek(src, layer->hierarchy_file_offset, RW_SEEK_SET);
hierarchy = read_xcf_hierarchy(src);
602
603
604
605
606
607
608
609
610
611
612
613
if (hierarchy->bpp > 4) { /* unsupported. */
SDL_Log("Unknown Gimp image bpp (%u)\n", (unsigned int) hierarchy->bpp);
free_xcf_hierarchy(hierarchy);
return 1;
}
if ((hierarchy->width > 20000) || (hierarchy->height > 20000)) { /* arbitrary limit to avoid integer overflow. */
SDL_Log("Gimp image too large (%ux%u)\n", (unsigned int) hierarchy->width, (unsigned int) hierarchy->height);
free_xcf_hierarchy(hierarchy);
return 1;
}
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
level = NULL;
for (i = 0; hierarchy->level_file_offsets[i]; i++) {
SDL_RWseek(src, hierarchy->level_file_offsets[i], RW_SEEK_SET);
level = read_xcf_level(src);
ty = tx = 0;
for (j = 0; level->tile_file_offsets[j]; j++) {
SDL_RWseek(src, level->tile_file_offsets[j], RW_SEEK_SET);
ox = tx + 64 > level->width ? level->width % 64 : 64;
oy = ty + 64 > level->height ? level->height % 64 : 64;
if (level->tile_file_offsets[j + 1]) {
tile = load_tile(src, level->tile_file_offsets[j + 1] - level->tile_file_offsets[j], hierarchy->bpp, ox, oy);
} else {
tile = load_tile(src, ox * oy * 6, hierarchy->bpp, ox, oy);
}
631
632
633
634
635
636
637
638
639
640
if (!tile) {
if (hierarchy) {
free_xcf_hierarchy(hierarchy);
}
if (level) {
free_xcf_level(level);
}
return 1;
}
641
642
643
644
p8 = tile;
p16 = (Uint16 *) p8;
p = (Uint32 *) p8;
for (y = ty; y < ty + oy; y++) {
645
646
647
if ((ty >= surface->h) || ((tx+ox) > surface->w)) {
break;
}
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
row = (Uint32 *) ((Uint8 *) surface->pixels + y * surface->pitch + tx * 4);
switch (hierarchy->bpp) {
case 4:
for (x = tx; x < tx + ox; x++)
*row++ = Swap32(*p++);
break;
case 3:
for (x = tx; x < tx + ox; x++) {
*row = 0xFF000000;
*row |= ((Uint32)*p8++ << 16);
*row |= ((Uint32)*p8++ << 8);
*row |= ((Uint32)*p8++ << 0);
row++;
}
break;
case 2:
/* Indexed / Greyscale + Alpha */
switch (head->image_type) {
case IMAGE_INDEXED:
for (x = tx; x < tx + ox; x++) {
*row = ((Uint32)(head->cm_map[*p8 * 3]) << 16);
*row |= ((Uint32)(head->cm_map[*p8 * 3 + 1]) << 8);
*row |= ((Uint32)(head->cm_map[*p8++ * 3 + 2]) << 0);
*row |= ((Uint32)*p8++ << 24);
row++;
}
break;
case IMAGE_GREYSCALE:
for (x = tx; x < tx + ox; x++) {
*row = ((Uint32)*p8 << 16);
*row |= ((Uint32)*p8 << 8);
*row |= ((Uint32)*p8++ << 0);
*row |= ((Uint32)*p8++ << 24);
row++;
}
break;
default:
685
SDL_Log("Unknown Gimp image type (%d)\n", head->image_type);
686
687
688
689
690
691
692
693
694
695
if (hierarchy) {
free_xcf_hierarchy(hierarchy);
}
if (level)
free_xcf_level(level);
return 1;
}
break;
case 1:
/* Indexed / Greyscale */
696
switch (head->image_type) {
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
case IMAGE_INDEXED:
for (x = tx; x < tx + ox; x++) {
*row++ = 0xFF000000
| ((Uint32)(head->cm_map[*p8 * 3]) << 16)
| ((Uint32)(head->cm_map[*p8 * 3 + 1]) << 8)
| ((Uint32)(head->cm_map[*p8 * 3 + 2]) << 0);
p8++;
}
break;
case IMAGE_GREYSCALE:
for (x = tx; x < tx + ox; x++) {
*row++ = 0xFF000000
| (((Uint32)(*p8)) << 16)
| (((Uint32)(*p8)) << 8)
| (((Uint32)(*p8)) << 0);
++p8;
}
break;
default:
716
SDL_Log("Unknown Gimp image type (%d)\n", head->image_type);
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
if (tile)
free_xcf_tile(tile);
if (level)
free_xcf_level(level);
if (hierarchy)
free_xcf_hierarchy(hierarchy);
return 1;
}
break;
}
}
free_xcf_tile(tile);
tx += 64;
if (tx >= level->width) {
tx = 0;
ty += 64;
}
if (ty >= level->height) {
break;
}
738
}
739
free_xcf_level(level);
740
}
741
742
free_xcf_hierarchy(hierarchy);
743
744
return 0;
745
746
}
747
748
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
{
749
Sint64 start;
750
const char *error = NULL;
751
752
753
754
SDL_Surface *surface, *lays;
xcf_header * head;
xcf_layer * layer;
xcf_channel ** channel;
755
int chnls, i, offsets;
756
Sint64 offset, fp;
757
758
759
unsigned char * (* load_tile) (SDL_RWops *, Uint32, int, int, int);
760
if (!src) {
761
762
763
/* The error message has been set in SDL_RWFromFile */
return NULL;
}
764
start = SDL_RWtell(src);
765
766
767
768
/* Initialize the data we will clean up when we're done */
surface = NULL;
769
770
771
772
head = read_xcf_header(src);
if (!head) {
return NULL;
}
773
774
775
776
777
778
779
780
781
switch (head->compr) {
case COMPR_NONE:
load_tile = load_xcf_tile_none;
break;
case COMPR_RLE:
load_tile = load_xcf_tile_rle;
break;
default:
782
SDL_Log("Unsupported Compression.\n");
783
784
785
786
787
free_xcf_header (head);
return NULL;
}
/* Create the surface of the appropriate type */
788
surface = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
789
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
790
791
if ( surface == NULL ) {
792
error = "Out of memory";
793
794
795
796
797
goto done;
}
offsets = 0;
798
while ((offset = SDL_ReadBE32 (src))) {
799
head->layer_file_offsets = (Uint32 *) SDL_realloc (head->layer_file_offsets, sizeof (Uint32) * (offsets+1));
800
head->layer_file_offsets [offsets] = (Uint32)offset;
801
802
803
offsets++;
}
fp = SDL_RWtell (src);
804
805
lays = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
806
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
807
808
if ( lays == NULL ) {
809
error = "Out of memory";
810
811
812
813
814
815
goto done;
}
// Blit layers backwards, because Gimp saves them highest first
for (i = offsets; i > 0; i--) {
SDL_Rect rs, rd;
816
SDL_RWseek (src, head->layer_file_offsets [i-1], RW_SEEK_SET);
817
818
819
820
821
822
823
824
825
826
827
828
layer = read_xcf_layer (src);
do_layer_surface (lays, src, head, layer, load_tile);
rs.x = 0;
rs.y = 0;
rs.w = layer->width;
rs.h = layer->height;
rd.x = layer->offset_x;
rd.y = layer->offset_y;
rd.w = layer->width;
rd.h = layer->height;
829
830
831
if (layer->visible)
SDL_BlitSurface (lays, &rs, surface, &rd);
free_xcf_layer (layer);
832
833
834
835
}
SDL_FreeSurface (lays);
836
SDL_RWseek (src, fp, RW_SEEK_SET);
837
838
839
840
// read channels
channel = NULL;
chnls = 0;
841
while ((offset = SDL_ReadBE32 (src))) {
842
channel = (xcf_channel **) SDL_realloc (channel, sizeof (xcf_channel *) * (chnls+1));
843
fp = SDL_RWtell (src);
844
SDL_RWseek (src, offset, RW_SEEK_SET);
845
channel [chnls++] = (read_xcf_channel (src));
846
SDL_RWseek (src, fp, RW_SEEK_SET);
847
848
849
850
851
}
if (chnls) {
SDL_Surface * chs;
852
chs = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
853
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
854
855
if (chs == NULL) {
856
error = "Out of memory";
857
858
859
860
goto done;
}
for (i = 0; i < chnls; i++) {
// printf ("CNLBLT %i\n", i);
861
if (!channel [i]->selection && channel [i]->visible) {
862
863
create_channel_surface (chs, (xcf_image_type)head->image_type, channel [i]->color, channel [i]->opacity);
SDL_BlitSurface (chs, NULL, surface, NULL);
864
865
866
}
free_xcf_channel (channel [i]);
}
867
SDL_free(channel);
868
869
870
871
SDL_FreeSurface (chs);
}
872
done:
873
free_xcf_header (head);
874
if ( error ) {
875
SDL_RWseek(src, start, RW_SEEK_SET);
876
877
878
879
if ( surface ) {
SDL_FreeSurface(surface);
surface = NULL;
}
880
IMG_SetError("%s", error);
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
}
return(surface);
}
#else
/* See if an image is contained in a data source */
int IMG_isXCF(SDL_RWops *src)
{
return(0);
}
/* Load a XCF type image from an SDL datasource */
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
{
return(NULL);
}
#endif /* LOAD_XCF */