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nsxivimage.c

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1/* Copyright 2011, 2012 Bert Muennich
2 *
3 * This file is part of sxiv.
4 *
5 * sxiv is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published
7 * by the Free Software Foundation; either version 2 of the License,
8 * or (at your option) any later version.
9 *
10 * sxiv is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with sxiv. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#define _POSIX_C_SOURCE 200112L
20#define _IMAGE_CONFIG
21
22#include <stdlib.h>
23#include <string.h>
24#include <sys/types.h>
25#include <unistd.h>
26
27#include "image.h"
28#include "options.h"
29#include "util.h"
30#include "config.h"
31
32#if HAVE_LIBEXIF
33#include <libexif/exif-data.h>
34#endif
35
36#if HAVE_GIFLIB
37#include <gif_lib.h>
38enum { DEF_GIF_DELAY = 75 };
39#endif
40
41float zoom_min;
42float zoom_max;
43
44static int zoomdiff(float z1, float z2)
45{
46 return (int) (z1 * 1000.0 - z2 * 1000.0);
47}
48
49void img_init(img_t *img, win_t *win)
50{
51 zoom_min = zoom_levels[0] / 100.0;
52 zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
53
54 if (img == NULL || win == NULL)
55 return;
56
57 imlib_context_set_display(win->env.dpy);
58 imlib_context_set_visual(win->env.vis);
59 imlib_context_set_colormap(win->env.cmap);
60
61 img->im = NULL;
62 img->win = win;
63 img->scalemode = options->scalemode;
64 img->zoom = options->zoom;
65 img->zoom = MAX(img->zoom, zoom_min);
66 img->zoom = MIN(img->zoom, zoom_max);
67 img->checkpan = false;
68 img->dirty = false;
69 img->aa = ANTI_ALIAS;
70 img->alpha = ALPHA_LAYER;
71 img->multi.cap = img->multi.cnt = 0;
72 img->multi.animate = options->animate;
73 img->multi.length = 0;
74
75 img->cmod = imlib_create_color_modifier();
76 imlib_context_set_color_modifier(img->cmod);
77 img->gamma = MIN(MAX(options->gamma, -GAMMA_RANGE), GAMMA_RANGE);
78
79 img->ss.on = options->slideshow > 0;
80 img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY;
81}
82
83#if HAVE_LIBEXIF
84void exif_auto_orientate(const fileinfo_t *file)
85{
86 ExifData *ed;
87 ExifEntry *entry;
88 int byte_order, orientation = 0;
89
90 if ((ed = exif_data_new_from_file(file->path)) == NULL)
91 return;
92 byte_order = exif_data_get_byte_order(ed);
93 entry = exif_content_get_entry(ed->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION);
94 if (entry != NULL)
95 orientation = exif_get_short(entry->data, byte_order);
96 exif_data_unref(ed);
97
98 switch (orientation) {
99 case 5:
100 imlib_image_orientate(1);
101 case 2:
102 imlib_image_flip_vertical();
103 break;
104 case 3:
105 imlib_image_orientate(2);
106 break;
107 case 7:
108 imlib_image_orientate(1);
109 case 4:
110 imlib_image_flip_horizontal();
111 break;
112 case 6:
113 imlib_image_orientate(1);
114 break;
115 case 8:
116 imlib_image_orientate(3);
117 break;
118 }
119}
120#endif
121
122#if HAVE_GIFLIB
123bool img_load_gif(img_t *img, const fileinfo_t *file)
124{
125 GifFileType *gif;
126 GifRowType *rows = NULL;
127 GifRecordType rec;
128 ColorMapObject *cmap;
129 DATA32 bgpixel, *data, *ptr;
130 DATA32 *prev_frame = NULL;
131 Imlib_Image im;
132 int i, j, bg, r, g, b;
133 int x, y, w, h, sw, sh;
134 int px, py, pw, ph;
135 int intoffset[] = { 0, 4, 2, 1 };
136 int intjump[] = { 8, 8, 4, 2 };
137 int transp = -1;
138 unsigned int disposal = 0, prev_disposal = 0;
139 unsigned int delay = 0;
140 bool err = false;
141
142 if (img->multi.cap == 0) {
143 img->multi.cap = 8;
144 img->multi.frames = (img_frame_t*)
145 s_malloc(sizeof(img_frame_t) * img->multi.cap);
146 }
147 img->multi.cnt = img->multi.sel = 0;
148 img->multi.length = 0;
149
150#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
151 gif = DGifOpenFileName(file->path, NULL);
152#else
153 gif = DGifOpenFileName(file->path);
154#endif
155 if (gif == NULL) {
156 warn("could not open gif file: %s", file->name);
157 return false;
158 }
159 bg = gif->SBackGroundColor;
160 sw = gif->SWidth;
161 sh = gif->SHeight;
162 px = py = pw = ph = 0;
163
164 do {
165 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
166 err = true;
167 break;
168 }
169 if (rec == EXTENSION_RECORD_TYPE) {
170 int ext_code;
171 GifByteType *ext = NULL;
172
173 DGifGetExtension(gif, &ext_code, &ext);
174 while (ext) {
175 if (ext_code == GRAPHICS_EXT_FUNC_CODE) {
176 if (ext[1] & 1)
177 transp = (int) ext[4];
178 else
179 transp = -1;
180
181 delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
182 disposal = (unsigned int) ext[1] >> 2 & 0x7;
183 }
184 ext = NULL;
185 DGifGetExtensionNext(gif, &ext);
186 }
187 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
188 if (DGifGetImageDesc(gif) == GIF_ERROR) {
189 err = true;
190 break;
191 }
192 x = gif->Image.Left;
193 y = gif->Image.Top;
194 w = gif->Image.Width;
195 h = gif->Image.Height;
196
197 rows = (GifRowType*) s_malloc(h * sizeof(GifRowType));
198 for (i = 0; i < h; i++)
199 rows[i] = (GifRowType) s_malloc(w * sizeof(GifPixelType));
200 if (gif->Image.Interlace) {
201 for (i = 0; i < 4; i++) {
202 for (j = intoffset[i]; j < h; j += intjump[i])
203 DGifGetLine(gif, rows[j], w);
204 }
205 } else {
206 for (i = 0; i < h; i++)
207 DGifGetLine(gif, rows[i], w);
208 }
209
210 ptr = data = (DATA32*) s_malloc(sizeof(DATA32) * sw * sh);
211 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
212 r = cmap->Colors[bg].Red;
213 g = cmap->Colors[bg].Green;
214 b = cmap->Colors[bg].Blue;
215 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
216
217 for (i = 0; i < sh; i++) {
218 for (j = 0; j < sw; j++) {
219 if (i < y || i >= y + h || j < x || j >= x + w ||
220 rows[i-y][j-x] == transp)
221 {
222 if (prev_frame != NULL && (prev_disposal != 2 ||
223 i < py || i >= py + ph || j < px || j >= px + pw))
224 {
225 *ptr = prev_frame[i * sw + j];
226 } else {
227 *ptr = bgpixel;
228 }
229 } else {
230 r = cmap->Colors[rows[i-y][j-x]].Red;
231 g = cmap->Colors[rows[i-y][j-x]].Green;
232 b = cmap->Colors[rows[i-y][j-x]].Blue;
233 *ptr = 0xff << 24 | r << 16 | g << 8 | b;
234 }
235 ptr++;
236 }
237 }
238
239 im = imlib_create_image_using_copied_data(sw, sh, data);
240
241 for (i = 0; i < h; i++)
242 free(rows[i]);
243 free(rows);
244 free(data);
245
246 if (im == NULL) {
247 err = true;
248 break;
249 }
250
251 imlib_context_set_image(im);
252 imlib_image_set_format("gif");
253 if (transp >= 0)
254 imlib_image_set_has_alpha(1);
255
256 if (disposal != 3)
257 prev_frame = imlib_image_get_data_for_reading_only();
258 prev_disposal = disposal;
259 px = x, py = y, pw = w, ph = h;
260
261 if (img->multi.cnt == img->multi.cap) {
262 img->multi.cap *= 2;
263 img->multi.frames = (img_frame_t*)
264 s_realloc(img->multi.frames,
265 img->multi.cap * sizeof(img_frame_t));
266 }
267 img->multi.frames[img->multi.cnt].im = im;
268 img->multi.frames[img->multi.cnt].delay = delay > 0 ? delay : DEF_GIF_DELAY;
269 img->multi.length += img->multi.frames[img->multi.cnt].delay;
270 img->multi.cnt++;
271 }
272 } while (rec != TERMINATE_RECORD_TYPE);
273
274#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
275 DGifCloseFile(gif, NULL);
276#else
277 DGifCloseFile(gif);
278#endif
279
280 if (err && (file->flags & FF_WARN))
281 warn("corrupted gif file: %s", file->name);
282
283 if (img->multi.cnt > 1) {
284 imlib_context_set_image(img->im);
285 imlib_free_image();
286 img->im = img->multi.frames[0].im;
287 } else if (img->multi.cnt == 1) {
288 imlib_context_set_image(img->multi.frames[0].im);
289 imlib_free_image();
290 img->multi.cnt = 0;
291 }
292
293 imlib_context_set_image(img->im);
294
295 return !err;
296}
297#endif /* HAVE_GIFLIB */
298
299bool img_load(img_t *img, const fileinfo_t *file)
300{
301 const char *fmt;
302
303 if (img == NULL || file == NULL || file->name == NULL || file->path == NULL)
304 return false;
305
306 if (access(file->path, R_OK) < 0 ||
307 (img->im = imlib_load_image(file->path)) == NULL)
308 {
309 if (file->flags & FF_WARN)
310 warn("could not open image: %s", file->name);
311 return false;
312 }
313
314 imlib_context_set_image(img->im);
315 imlib_image_set_changes_on_disk();
316
317#if HAVE_LIBEXIF
318 exif_auto_orientate(file);
319#endif
320
321 if ((fmt = imlib_image_format()) != NULL) {
322#if HAVE_GIFLIB
323 if (STREQ(fmt, "gif"))
324 img_load_gif(img, file);
325#endif
326 }
327 img->w = imlib_image_get_width();
328 img->h = imlib_image_get_height();
329 img->checkpan = true;
330 img->dirty = true;
331
332 return true;
333}
334
335void img_close(img_t *img, bool decache)
336{
337 int i;
338
339 if (img == NULL)
340 return;
341
342 if (img->multi.cnt > 0) {
343 for (i = 0; i < img->multi.cnt; i++) {
344 imlib_context_set_image(img->multi.frames[i].im);
345 imlib_free_image();
346 }
347 img->multi.cnt = 0;
348 img->im = NULL;
349 } else if (img->im != NULL) {
350 imlib_context_set_image(img->im);
351 if (decache)
352 imlib_free_image_and_decache();
353 else
354 imlib_free_image();
355 img->im = NULL;
356 }
357}
358
359void img_check_pan(img_t *img, bool moved)
360{
361 win_t *win;
362 int ox, oy;
363 float w, h;
364
365 if (img == NULL || img->im == NULL || img->win == NULL)
366 return;
367
368 win = img->win;
369 w = img->w * img->zoom;
370 h = img->h * img->zoom;
371 ox = img->x;
372 oy = img->y;
373
374 if (w < win->w)
375 img->x = (win->w - w) / 2;
376 else if (img->x > 0)
377 img->x = 0;
378 else if (img->x + w < win->w)
379 img->x = win->w - w;
380 if (h < win->h)
381 img->y = (win->h - h) / 2;
382 else if (img->y > 0)
383 img->y = 0;
384 else if (img->y + h < win->h)
385 img->y = win->h - h;
386
387 if (!moved && (ox != img->x || oy != img->y))
388 img->dirty = true;
389}
390
391bool img_fit(img_t *img)
392{
393 float z, zmax, zw, zh;
394
395 if (img == NULL || img->im == NULL || img->win == NULL)
396 return false;
397 if (img->scalemode == SCALE_ZOOM)
398 return false;
399
400 zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
401 zw = (float) img->win->w / (float) img->w;
402 zh = (float) img->win->h / (float) img->h;
403
404 switch (img->scalemode) {
405 case SCALE_WIDTH:
406 z = zw;
407 break;
408 case SCALE_HEIGHT:
409 z = zh;
410 break;
411 default:
412 z = MIN(zw, zh);
413 break;
414 }
415
416 z = MAX(z, zoom_min);
417 z = MIN(z, zmax);
418
419 if (zoomdiff(z, img->zoom) != 0) {
420 img->zoom = z;
421 img->dirty = true;
422 return true;
423 } else {
424 return false;
425 }
426}
427
428void img_render(img_t *img)
429{
430 win_t *win;
431 int sx, sy, sw, sh;
432 int dx, dy, dw, dh;
433 Imlib_Image bg;
434 unsigned long c;
435
436 if (img == NULL || img->im == NULL || img->win == NULL)
437 return;
438
439 win = img->win;
440 img_fit(img);
441
442 if (img->checkpan) {
443 img_check_pan(img, false);
444 img->checkpan = false;
445 }
446
447 if (!img->dirty)
448 return;
449
450 /* calculate source and destination offsets:
451 * - part of image drawn on full window, or
452 * - full image drawn on part of window
453 */
454 if (img->x <= 0) {
455 sx = -img->x / img->zoom + 0.5;
456 sw = win->w / img->zoom;
457 dx = 0;
458 dw = win->w;
459 } else {
460 sx = 0;
461 sw = img->w;
462 dx = img->x;
463 dw = img->w * img->zoom;
464 }
465 if (img->y <= 0) {
466 sy = -img->y / img->zoom + 0.5;
467 sh = win->h / img->zoom;
468 dy = 0;
469 dh = win->h;
470 } else {
471 sy = 0;
472 sh = img->h;
473 dy = img->y;
474 dh = img->h * img->zoom;
475 }
476
477 win_clear(win);
478
479 imlib_context_set_image(img->im);
480 imlib_context_set_anti_alias(img->aa);
481 imlib_context_set_drawable(win->buf.pm);
482
483 if (imlib_image_has_alpha()) {
484 if ((bg = imlib_create_image(dw, dh)) == NULL)
485 die("could not allocate memory");
486 imlib_context_set_image(bg);
487 imlib_image_set_has_alpha(0);
488
489 if (img->alpha) {
490 int i, c, r;
491 DATA32 col[2] = { 0xFF666666, 0xFF999999 };
492 DATA32 * data = imlib_image_get_data();
493
494 for (r = 0; r < dh; r++) {
495 i = r * dw;
496 if (r == 0 || r == 8) {
497 for (c = 0; c < dw; c++)
498 data[i++] = col[!(c & 8) ^ !r];
499 } else {
500 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
501 }
502 }
503 imlib_image_put_back_data(data);
504 } else {
505 c = win->fullscreen ? win->fscol : win->bgcol;
506 imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
507 imlib_image_fill_rectangle(0, 0, dw, dh);
508 }
509 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
510 imlib_context_set_color_modifier(NULL);
511 imlib_render_image_on_drawable(dx, dy);
512 imlib_free_image();
513 imlib_context_set_color_modifier(img->cmod);
514 } else {
515 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
516 }
517 img->dirty = false;
518}
519
520bool img_fit_win(img_t *img, scalemode_t sm)
521{
522 float oz;
523
524 if (img == NULL || img->im == NULL || img->win == NULL)
525 return false;
526
527 oz = img->zoom;
528 img->scalemode = sm;
529
530 if (img_fit(img)) {
531 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
532 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
533 img->checkpan = true;
534 return true;
535 } else {
536 return false;
537 }
538}
539
540bool img_zoom(img_t *img, float z)
541{
542 if (img == NULL || img->im == NULL || img->win == NULL)
543 return false;
544
545 z = MAX(z, zoom_min);
546 z = MIN(z, zoom_max);
547
548 img->scalemode = SCALE_ZOOM;
549
550 if (zoomdiff(z, img->zoom) != 0) {
551 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
552 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
553 img->zoom = z;
554 img->checkpan = true;
555 img->dirty = true;
556 return true;
557 } else {
558 return false;
559 }
560}
561
562bool img_zoom_in(img_t *img)
563{
564 int i;
565 float z;
566
567 if (img == NULL || img->im == NULL)
568 return false;
569
570 for (i = 1; i < ARRLEN(zoom_levels); i++) {
571 z = zoom_levels[i] / 100.0;
572 if (zoomdiff(z, img->zoom) > 0)
573 return img_zoom(img, z);
574 }
575 return false;
576}
577
578bool img_zoom_out(img_t *img)
579{
580 int i;
581 float z;
582
583 if (img == NULL || img->im == NULL)
584 return false;
585
586 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
587 z = zoom_levels[i] / 100.0;
588 if (zoomdiff(z, img->zoom) < 0)
589 return img_zoom(img, z);
590 }
591 return false;
592}
593
594bool img_move(img_t *img, float dx, float dy)
595{
596 float ox, oy;
597
598 if (img == NULL || img->im == NULL)
599 return false;
600
601 ox = img->x;
602 oy = img->y;
603
604 img->x += dx;
605 img->y += dy;
606
607 img_check_pan(img, true);
608
609 if (ox != img->x || oy != img->y) {
610 img->dirty = true;
611 return true;
612 } else {
613 return false;
614 }
615}
616
617bool img_pan(img_t *img, direction_t dir, int d)
618{
619 /* d < 0: screen-wise
620 * d = 0: 1/5 of screen
621 * d > 0: num of pixels
622 */
623 float x, y;
624
625 if (img == NULL || img->im == NULL || img->win == NULL)
626 return false;
627
628 if (d > 0) {
629 x = y = MAX(1, (float) d * img->zoom);
630 } else {
631 x = img->win->w / (d < 0 ? 1 : 5);
632 y = img->win->h / (d < 0 ? 1 : 5);
633 }
634
635 switch (dir) {
636 case DIR_LEFT:
637 return img_move(img, x, 0.0);
638 case DIR_RIGHT:
639 return img_move(img, -x, 0.0);
640 case DIR_UP:
641 return img_move(img, 0.0, y);
642 case DIR_DOWN:
643 return img_move(img, 0.0, -y);
644 }
645 return false;
646}
647
648bool img_pan_edge(img_t *img, direction_t dir)
649{
650 int ox, oy;
651
652 if (img == NULL || img->im == NULL || img->win == NULL)
653 return false;
654
655 ox = img->x;
656 oy = img->y;
657
658 if (dir & DIR_LEFT)
659 img->x = 0;
660 if (dir & DIR_RIGHT)
661 img->x = img->win->w - img->w * img->zoom;
662 if (dir & DIR_UP)
663 img->y = 0;
664 if (dir & DIR_DOWN)
665 img->y = img->win->h - img->h * img->zoom;
666
667 img_check_pan(img, true);
668
669 if (ox != img->x || oy != img->y) {
670 img->dirty = true;
671 return true;
672 } else {
673 return false;
674 }
675}
676
677void img_rotate(img_t *img, degree_t d)
678{
679 int i, ox, oy, tmp;
680
681 if (img == NULL || img->im == NULL || img->win == NULL)
682 return;
683
684 imlib_context_set_image(img->im);
685 imlib_image_orientate(d);
686
687 for (i = 0; i < img->multi.cnt; i++) {
688 if (i != img->multi.sel) {
689 imlib_context_set_image(img->multi.frames[i].im);
690 imlib_image_orientate(d);
691 }
692 }
693 if (d == DEGREE_90 || d == DEGREE_270) {
694 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
695 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
696
697 img->x = oy + (img->win->w - img->win->h) / 2;
698 img->y = ox + (img->win->h - img->win->w) / 2;
699
700 tmp = img->w;
701 img->w = img->h;
702 img->h = tmp;
703 img->checkpan = true;
704 }
705 img->dirty = true;
706}
707
708void img_flip(img_t *img, flipdir_t d)
709{
710 int i;
711 void (*imlib_flip_op[3])(void) = {
712 imlib_image_flip_horizontal,
713 imlib_image_flip_vertical,
714 imlib_image_flip_diagonal
715 };
716
717 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
718
719 if (img == NULL || img->im == NULL || d < 0 || d >= ARRLEN(imlib_flip_op))
720 return;
721
722 imlib_context_set_image(img->im);
723 imlib_flip_op[d]();
724
725 for (i = 0; i < img->multi.cnt; i++) {
726 if (i != img->multi.sel) {
727 imlib_context_set_image(img->multi.frames[i].im);
728 imlib_flip_op[d]();
729 }
730 }
731 img->dirty = true;
732}
733
734void img_toggle_antialias(img_t *img)
735{
736 if (img == NULL || img->im == NULL)
737 return;
738
739 img->aa = !img->aa;
740 imlib_context_set_image(img->im);
741 imlib_context_set_anti_alias(img->aa);
742 img->dirty = true;
743}
744
745bool img_change_gamma(img_t *img, int d)
746{
747 /* d < 0: decrease gamma
748 * d = 0: reset gamma
749 * d > 0: increase gamma
750 */
751 int gamma;
752 double range;
753
754 if (img == NULL)
755 return false;
756
757 if (d == 0)
758 gamma = 0;
759 else
760 gamma = MIN(MAX(img->gamma + d, -GAMMA_RANGE), GAMMA_RANGE);
761
762 if (img->gamma != gamma) {
763 imlib_reset_color_modifier();
764 if (gamma != 0) {
765 range = gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
766 imlib_modify_color_modifier_gamma(1.0 + gamma * (range / GAMMA_RANGE));
767 }
768 img->gamma = gamma;
769 img->dirty = true;
770 return true;
771 } else {
772 return false;
773 }
774}
775
776bool img_frame_goto(img_t *img, int n)
777{
778 if (img == NULL || img->im == NULL)
779 return false;
780 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
781 return false;
782
783 img->multi.sel = n;
784 img->im = img->multi.frames[n].im;
785
786 imlib_context_set_image(img->im);
787 img->w = imlib_image_get_width();
788 img->h = imlib_image_get_height();
789 img->checkpan = true;
790 img->dirty = true;
791
792 return true;
793}
794
795bool img_frame_navigate(img_t *img, int d)
796{
797 if (img == NULL|| img->im == NULL || img->multi.cnt == 0 || d == 0)
798 return false;
799
800 d += img->multi.sel;
801 if (d < 0)
802 d = 0;
803 else if (d >= img->multi.cnt)
804 d = img->multi.cnt - 1;
805
806 return img_frame_goto(img, d);
807}
808
809bool img_frame_animate(img_t *img)
810{
811 if (img == NULL || img->im == NULL || img->multi.cnt == 0)
812 return false;
813
814 if (img->multi.sel + 1 >= img->multi.cnt)
815 img_frame_goto(img, 0);
816 else
817 img_frame_goto(img, img->multi.sel + 1);
818 img->dirty = true;
819 return true;
820}
821