/
IMG_xcf.c
895 lines (760 loc) · 22.2 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
224
225
226
227
228
}
static char * read_string (SDL_RWops * src) {
Uint32 tmp;
char * data;
tmp = SDL_ReadBE32 (src);
if (tmp > 0) {
229
data = (char *) SDL_malloc (sizeof (char) * tmp);
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
SDL_RWread (src, data, tmp, 1);
}
else {
data = NULL;
}
return data;
}
static Uint32 Swap32 (Uint32 v) {
return
((v & 0x000000FF) << 16)
| ((v & 0x0000FF00))
| ((v & 0x00FF0000) >> 16)
| ((v & 0xFF000000));
}
248
static void xcf_read_property (SDL_RWops * src, xcf_prop * prop) {
249
Uint32 len;
250
251
252
prop->id = SDL_ReadBE32 (src);
prop->length = SDL_ReadBE32 (src);
253
#if DEBUG
254
printf ("%.8X: %s: %d\n", SDL_RWtell (src), prop->id < 25 ? prop_names [prop->id] : "unknown", prop->length);
255
#endif
256
257
258
259
switch (prop->id) {
case PROP_COLORMAP:
prop->data.colormap.num = SDL_ReadBE32 (src);
260
prop->data.colormap.cmap = (char *) SDL_malloc (sizeof (char) * prop->data.colormap.num * 3);
261
262
263
264
265
266
267
268
269
270
271
272
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:
273
274
275
276
277
278
if (prop->length > sizeof(prop->data)) {
len = sizeof(prop->data);
} else {
len = prop->length;
}
SDL_RWread(src, &prop->data, len, 1);
279
break;
280
281
282
case PROP_VISIBLE:
prop->data.visible = SDL_ReadBE32 (src);
break;
283
284
default:
// SDL_RWread (src, &prop->data, prop->length, 1);
285
SDL_RWseek (src, prop->length, RW_SEEK_CUR);
286
287
288
}
}
289
static void free_xcf_header (xcf_header * h) {
290
if (h->cm_num)
291
SDL_free (h->cm_map);
292
if (h->layer_file_offsets)
293
SDL_free (h->layer_file_offsets);
294
SDL_free (h);
295
296
}
297
static xcf_header * read_xcf_header (SDL_RWops * src) {
298
299
300
xcf_header * h;
xcf_prop prop;
301
h = (xcf_header *) SDL_malloc (sizeof (xcf_header));
302
303
304
if (!h) {
return NULL;
}
305
306
307
308
309
310
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;
311
h->layer_file_offsets = NULL;
312
313
314
315
316
317
318
319
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)
320
h->compr = (xcf_compr_type)prop.data.compression;
321
else if (prop.id == PROP_COLORMAP) {
322
// unused var: int i;
323
324
325
326
327
328
329
330
331
332
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);
}
333
SDL_free (prop.data.colormap.cmap);
334
335
336
337
338
if (!cm_map) {
free_xcf_header(h);
return NULL;
}
339
340
341
342
343
344
}
} while (prop.id != PROP_END);
return h;
}
345
static void free_xcf_layer (xcf_layer * l) {
346
347
SDL_free (l->name);
SDL_free (l);
348
349
}
350
static xcf_layer * read_xcf_layer (SDL_RWops * src) {
351
352
353
xcf_layer * l;
xcf_prop prop;
354
l = (xcf_layer *) SDL_malloc (sizeof (xcf_layer));
355
356
357
358
359
360
361
362
363
364
365
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;
366
367
} else if (prop.id == PROP_VISIBLE) {
l->visible = prop.data.visible ? 1 : 0;
368
369
370
371
372
373
374
375
376
}
} while (prop.id != PROP_END);
l->hierarchy_file_offset = SDL_ReadBE32 (src);
l->layer_mask_offset = SDL_ReadBE32 (src);
return l;
}
377
static void free_xcf_channel (xcf_channel * c) {
378
379
SDL_free (c->name);
SDL_free (c);
380
381
}
382
static xcf_channel * read_xcf_channel (SDL_RWops * src) {
383
384
385
xcf_channel * l;
xcf_prop prop;
386
l = (xcf_channel *) SDL_malloc (sizeof (xcf_channel));
387
388
389
390
391
392
393
394
395
396
397
398
399
400
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)
401
402
| ((Uint32) prop.data.color[1] << 8)
| ((Uint32) prop.data.color[2]);
403
404
405
406
break;
case PROP_SELECTION:
l->selection = 1;
break;
407
408
409
case PROP_VISIBLE:
l->visible = prop.data.visible ? 1 : 0;
break;
410
default:
411
;
412
413
414
415
416
417
418
419
}
} while (prop.id != PROP_END);
l->hierarchy_file_offset = SDL_ReadBE32 (src);
return l;
}
420
static void free_xcf_hierarchy (xcf_hierarchy * h) {
421
422
SDL_free (h->level_file_offsets);
SDL_free (h);
423
424
}
425
static xcf_hierarchy * read_xcf_hierarchy (SDL_RWops * src) {
426
427
428
xcf_hierarchy * h;
int i;
429
h = (xcf_hierarchy *) SDL_malloc (sizeof (xcf_hierarchy));
430
431
432
433
434
435
436
h->width = SDL_ReadBE32 (src);
h->height = SDL_ReadBE32 (src);
h->bpp = SDL_ReadBE32 (src);
h->level_file_offsets = NULL;
i = 0;
do {
437
h->level_file_offsets = (Uint32 *) SDL_realloc (h->level_file_offsets, sizeof (Uint32) * (i+1));
438
439
440
441
442
443
h->level_file_offsets [i] = SDL_ReadBE32 (src);
} while (h->level_file_offsets [i++]);
return h;
}
444
static void free_xcf_level (xcf_level * l) {
445
446
SDL_free (l->tile_file_offsets);
SDL_free (l);
447
448
}
449
static xcf_level * read_xcf_level (SDL_RWops * src) {
450
451
452
xcf_level * l;
int i;
453
l = (xcf_level *) SDL_malloc (sizeof (xcf_level));
454
455
456
457
458
459
l->width = SDL_ReadBE32 (src);
l->height = SDL_ReadBE32 (src);
l->tile_file_offsets = NULL;
i = 0;
do {
460
l->tile_file_offsets = (Uint32 *) SDL_realloc (l->tile_file_offsets, sizeof (Uint32) * (i+1));
461
462
463
464
465
466
l->tile_file_offsets [i] = SDL_ReadBE32 (src);
} while (l->tile_file_offsets [i++]);
return l;
}
467
static void free_xcf_tile (unsigned char * t) {
468
SDL_free (t);
469
470
}
471
static unsigned char * load_xcf_tile_none (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
472
473
unsigned char * load;
474
load = (unsigned char *) SDL_malloc (len); // expect this is okay
475
476
477
478
479
SDL_RWread (src, load, len, 1);
return load;
}
480
static unsigned char * load_xcf_tile_rle (SDL_RWops * src, Uint32 len, int bpp, int x, int y) {
481
482
483
484
485
unsigned char * load, * t, * data, * d;
Uint32 reallen;
int i, size, count, j, length;
unsigned char val;
486
487
488
489
if (len == 0) { /* probably bogus data. */
return NULL;
}
490
t = load = (unsigned char *) SDL_malloc (len);
491
492
reallen = SDL_RWread (src, t, 1, len);
493
data = (unsigned char *) SDL_calloc (1, x*y*bpp);
494
495
496
497
for (i = 0; i < bpp; i++) {
d = data + i;
size = x*y;
count = 0;
498
499
500
501
502
503
while (size > 0) {
val = *t++;
length = val;
if (length >= 128) {
504
505
506
507
508
length = 255 - (length - 1);
if (length == 128) {
length = (*t << 8) + t[1];
t += 2;
}
509
510
511
512
513
514
515
if (((size_t) (t - load) + length) >= len) {
break; /* bogus data */
} else if (length > size) {
break; /* bogus data */
}
516
517
count += length;
size -= length;
518
519
520
521
522
523
524
525
526
527
528
while (length-- > 0) {
*d = *t++;
d += bpp;
}
} else {
length += 1;
if (length == 128) {
length = (*t << 8) + t[1];
t += 2;
}
529
530
531
532
533
534
535
if (((size_t) (t - load)) >= len) {
break; /* bogus data */
} else if (length > size) {
break; /* bogus data */
}
536
537
count += length;
size -= length;
538
539
val = *t++;
540
541
542
543
544
for (j = 0; j < length; j++) {
*d = val;
d += bpp;
}
545
546
}
}
547
548
549
550
551
if (size > 0) {
break; /* just drop out, untouched data initialized to zero. */
}
552
553
}
554
SDL_free (load);
555
556
557
558
559
return (data);
}
static Uint32 rgb2grey (Uint32 a) {
Uint8 l;
560
561
562
l = (Uint8)(0.2990 * ((a & 0x00FF0000) >> 16)
+ 0.5870 * ((a & 0x0000FF00) >> 8)
+ 0.1140 * ((a & 0x000000FF)));
563
564
565
566
return (l << 16) | (l << 8) | l;
}
567
static void create_channel_surface (SDL_Surface * surf, xcf_image_type itype, Uint32 color, Uint32 opacity) {
568
Uint32 c = 0;
569
570
571
572
573
574
575
576
577
578
579
580
581
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);
}
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
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);
598
599
600
601
602
603
604
605
606
607
608
609
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;
}
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
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);
}
627
628
629
630
631
632
633
634
635
636
if (!tile) {
if (hierarchy) {
free_xcf_hierarchy(hierarchy);
}
if (level) {
free_xcf_level(level);
}
return 1;
}
637
638
639
640
p8 = tile;
p16 = (Uint16 *) p8;
p = (Uint32 *) p8;
for (y = ty; y < ty + oy; y++) {
641
642
643
if ((ty >= surface->h) || ((tx+ox) > surface->w)) {
break;
}
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
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:
681
SDL_Log("Unknown Gimp image type (%d)\n", head->image_type);
682
683
684
685
686
687
688
689
690
691
if (hierarchy) {
free_xcf_hierarchy(hierarchy);
}
if (level)
free_xcf_level(level);
return 1;
}
break;
case 1:
/* Indexed / Greyscale */
692
switch (head->image_type) {
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
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:
712
SDL_Log("Unknown Gimp image type (%d)\n", head->image_type);
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
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;
}
734
}
735
free_xcf_level(level);
736
}
737
738
free_xcf_hierarchy(hierarchy);
739
740
return 0;
741
742
}
743
744
SDL_Surface *IMG_LoadXCF_RW(SDL_RWops *src)
{
745
Sint64 start;
746
const char *error = NULL;
747
748
749
750
SDL_Surface *surface, *lays;
xcf_header * head;
xcf_layer * layer;
xcf_channel ** channel;
751
int chnls, i, offsets;
752
Sint64 offset, fp;
753
754
755
unsigned char * (* load_tile) (SDL_RWops *, Uint32, int, int, int);
756
if (!src) {
757
758
759
/* The error message has been set in SDL_RWFromFile */
return NULL;
}
760
start = SDL_RWtell(src);
761
762
763
764
/* Initialize the data we will clean up when we're done */
surface = NULL;
765
766
767
768
head = read_xcf_header(src);
if (!head) {
return NULL;
}
769
770
771
772
773
774
775
776
777
switch (head->compr) {
case COMPR_NONE:
load_tile = load_xcf_tile_none;
break;
case COMPR_RLE:
load_tile = load_xcf_tile_rle;
break;
default:
778
SDL_Log("Unsupported Compression.\n");
779
780
781
782
783
free_xcf_header (head);
return NULL;
}
/* Create the surface of the appropriate type */
784
surface = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
785
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
786
787
if ( surface == NULL ) {
788
error = "Out of memory";
789
790
791
792
793
goto done;
}
offsets = 0;
794
while ((offset = SDL_ReadBE32 (src))) {
795
head->layer_file_offsets = (Uint32 *) SDL_realloc (head->layer_file_offsets, sizeof (Uint32) * (offsets+1));
796
head->layer_file_offsets [offsets] = (Uint32)offset;
797
798
799
offsets++;
}
fp = SDL_RWtell (src);
800
801
lays = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
802
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
803
804
if ( lays == NULL ) {
805
error = "Out of memory";
806
807
808
809
810
811
goto done;
}
// Blit layers backwards, because Gimp saves them highest first
for (i = offsets; i > 0; i--) {
SDL_Rect rs, rd;
812
SDL_RWseek (src, head->layer_file_offsets [i-1], RW_SEEK_SET);
813
814
815
816
817
818
819
820
821
822
823
824
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;
825
826
827
if (layer->visible)
SDL_BlitSurface (lays, &rs, surface, &rd);
free_xcf_layer (layer);
828
829
830
831
}
SDL_FreeSurface (lays);
832
SDL_RWseek (src, fp, RW_SEEK_SET);
833
834
835
836
// read channels
channel = NULL;
chnls = 0;
837
while ((offset = SDL_ReadBE32 (src))) {
838
channel = (xcf_channel **) SDL_realloc (channel, sizeof (xcf_channel *) * (chnls+1));
839
fp = SDL_RWtell (src);
840
SDL_RWseek (src, offset, RW_SEEK_SET);
841
channel [chnls++] = (read_xcf_channel (src));
842
SDL_RWseek (src, fp, RW_SEEK_SET);
843
844
845
846
847
}
if (chnls) {
SDL_Surface * chs;
848
chs = SDL_CreateRGBSurface(SDL_SWSURFACE, head->width, head->height, 32,
849
0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);
850
851
if (chs == NULL) {
852
error = "Out of memory";
853
854
855
856
goto done;
}
for (i = 0; i < chnls; i++) {
// printf ("CNLBLT %i\n", i);
857
if (!channel [i]->selection && channel [i]->visible) {
858
859
create_channel_surface (chs, (xcf_image_type)head->image_type, channel [i]->color, channel [i]->opacity);
SDL_BlitSurface (chs, NULL, surface, NULL);
860
861
862
863
864
865
866
}
free_xcf_channel (channel [i]);
}
SDL_FreeSurface (chs);
}
867
done:
868
free_xcf_header (head);
869
if ( error ) {
870
SDL_RWseek(src, start, RW_SEEK_SET);
871
872
873
874
if ( surface ) {
SDL_FreeSurface(surface);
surface = NULL;
}
875
IMG_SetError("%s", error);
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
}
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 */