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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#define _RENDER_CONFIG
22
23#include <stdlib.h>
24#include <string.h>
25#include <sys/types.h>
26#include <unistd.h>
27
28#if HAVE_GIFLIB
29#include <gif_lib.h>
30enum { MIN_GIF_DELAY = 25 };
31#endif
32
33#include "exif.h"
34#include "image.h"
35#include "options.h"
36#include "util.h"
37#include "config.h"
38
39float zoom_min;
40float zoom_max;
41
42static int zoomdiff(float z1, float z2)
43{
44 return (int) (z1 * 1000.0 - z2 * 1000.0);
45}
46
47static void img_apply_gamma(img_t *img)
48{
49 if (img == NULL || img->im == NULL || img->cmod == NULL)
50 return;
51
52 if (img->gamma == 0) {
53 imlib_context_set_color_modifier(NULL);
54 } else {
55 double range = img->gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
56
57 imlib_context_set_color_modifier(img->cmod);
58 imlib_reset_color_modifier();
59 imlib_modify_color_modifier_gamma(1.0 + img->gamma * (range / GAMMA_RANGE));
60 }
61}
62
63void img_init(img_t *img, win_t *win)
64{
65 zoom_min = zoom_levels[0] / 100.0;
66 zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
67
68 if (img == NULL || win == NULL)
69 return;
70
71 imlib_context_set_display(win->env.dpy);
72 imlib_context_set_visual(win->env.vis);
73 imlib_context_set_colormap(win->env.cmap);
74
75 img->im = NULL;
76 img->win = win;
77 img->zoom = options->zoom;
78 img->zoom = MAX(img->zoom, zoom_min);
79 img->zoom = MIN(img->zoom, zoom_max);
80 img->checkpan = false;
81 img->dirty = false;
82 img->aa = RENDER_ANTI_ALIAS;
83 img->alpha = !RENDER_WHITE_ALPHA;
84 img->multi.cap = img->multi.cnt = 0;
85 img->multi.animate = false;
86 img->multi.anim_repeats = -1;
87 img->multi.repeats_currently_left = 0;
88
89 img->cmod = imlib_create_color_modifier();
90 img->gamma = MIN(MAX(options->gamma, -GAMMA_RANGE), GAMMA_RANGE);
91}
92
93void exif_auto_orientate(const fileinfo_t *file)
94{
95 switch (exif_orientation(file)) {
96 case 5:
97 imlib_image_orientate(1);
98 case 2:
99 imlib_image_flip_vertical();
100 break;
101
102 case 3:
103 imlib_image_orientate(2);
104 break;
105
106 case 7:
107 imlib_image_orientate(1);
108 case 4:
109 imlib_image_flip_horizontal();
110 break;
111
112 case 6:
113 imlib_image_orientate(1);
114 break;
115
116 case 8:
117 imlib_image_orientate(3);
118 break;
119 }
120}
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 = 0;
148 img->multi.sel = 0;
149 img->multi.anim_repeats = -1;
150 img->multi.repeats_currently_left = 0;
151
152#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
153 gif = DGifOpenFileName(file->path, NULL);
154#else
155 gif = DGifOpenFileName(file->path);
156#endif
157 if (gif == NULL) {
158 warn("could not open gif file: %s", file->name);
159 return false;
160 }
161 bg = gif->SBackGroundColor;
162 sw = gif->SWidth;
163 sh = gif->SHeight;
164 px = py = pw = ph = 0;
165
166 do {
167 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
168 err = true;
169 break;
170 }
171 if (rec == EXTENSION_RECORD_TYPE) {
172 int ext_code;
173 GifByteType *ext = NULL;
174
175 DGifGetExtension(gif, &ext_code, &ext);
176 while (ext) {
177 if (ext_code == 0xf9) { /*Graphics Control Extension*/
178 if (ext[1] & 1)
179 transp = (int) ext[4];
180 else
181 transp = -1;
182
183 delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
184 if (delay)
185 delay = MAX(delay, MIN_GIF_DELAY);
186
187 disposal = (unsigned int) ext[1] >> 2 & 0x7;
188 } else if (ext_code == 0xff) { /*Application Extension*/
189 if(ext[0] == 11 && memcmp(ext+1, "NETSCAPE2.0", 11) == 0) {
190 DGifGetExtensionNext(gif, &ext);
191
192 if(ext && ext[0] == 3 && ext[1] == 1) {
193 img->multi.repeats_currently_left =
194 img->multi.anim_repeats =
195 ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
196 }
197 }
198 }
199 ext = NULL;
200 DGifGetExtensionNext(gif, &ext);
201 }
202 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
203 if (DGifGetImageDesc(gif) == GIF_ERROR) {
204 err = true;
205 break;
206 }
207 x = gif->Image.Left;
208 y = gif->Image.Top;
209 w = gif->Image.Width;
210 h = gif->Image.Height;
211
212 rows = (GifRowType*) s_malloc(h * sizeof(GifRowType));
213 for (i = 0; i < h; i++)
214 rows[i] = (GifRowType) s_malloc(w * sizeof(GifPixelType));
215 if (gif->Image.Interlace) {
216 for (i = 0; i < 4; i++) {
217 for (j = intoffset[i]; j < h; j += intjump[i])
218 DGifGetLine(gif, rows[j], w);
219 }
220 } else {
221 for (i = 0; i < h; i++)
222 DGifGetLine(gif, rows[i], w);
223 }
224
225 ptr = data = (DATA32*) s_malloc(sizeof(DATA32) * sw * sh);
226 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
227 r = cmap->Colors[bg].Red;
228 g = cmap->Colors[bg].Green;
229 b = cmap->Colors[bg].Blue;
230 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
231
232 for (i = 0; i < sh; i++) {
233 for (j = 0; j < sw; j++) {
234 if (i < y || i >= y + h || j < x || j >= x + w ||
235 rows[i-y][j-x] == transp)
236 {
237 if (prev_frame != NULL && (prev_disposal != 2 ||
238 i < py || i >= py + ph || j < px || j >= px + pw))
239 {
240 *ptr = prev_frame[i * sw + j];
241 } else {
242 *ptr = bgpixel;
243 }
244 } else {
245 r = cmap->Colors[rows[i-y][j-x]].Red;
246 g = cmap->Colors[rows[i-y][j-x]].Green;
247 b = cmap->Colors[rows[i-y][j-x]].Blue;
248 *ptr = 0xff << 24 | r << 16 | g << 8 | b;
249 }
250 ptr++;
251 }
252 }
253
254 im = imlib_create_image_using_copied_data(sw, sh, data);
255
256 for (i = 0; i < h; i++)
257 free(rows[i]);
258 free(rows);
259 free(data);
260
261 if (im == NULL) {
262 err = true;
263 break;
264 }
265
266 imlib_context_set_image(im);
267 imlib_image_set_format("gif");
268 if (transp >= 0)
269 imlib_image_set_has_alpha(1);
270
271 if (disposal != 3)
272 prev_frame = imlib_image_get_data_for_reading_only();
273 prev_disposal = disposal;
274 px = x, py = y, pw = w, ph = h;
275
276 if (img->multi.cnt == img->multi.cap) {
277 img->multi.cap *= 2;
278 img->multi.frames = (img_frame_t*)
279 s_realloc(img->multi.frames,
280 img->multi.cap * sizeof(img_frame_t));
281 }
282 img->multi.frames[img->multi.cnt].im = im;
283 img->multi.frames[img->multi.cnt].delay = delay ? delay : GIF_DELAY;
284 img->multi.cnt++;
285 }
286 } while (rec != TERMINATE_RECORD_TYPE);
287
288 DGifCloseFile(gif);
289
290 if (err && !file->loaded)
291 warn("corrupted gif file: %s", file->name);
292
293 if (img->multi.cnt > 1) {
294 imlib_context_set_image(img->im);
295 imlib_free_image();
296 img->im = img->multi.frames[0].im;
297 img->multi.animate = GIF_AUTOPLAY;
298 } else if (img->multi.cnt == 1) {
299 imlib_context_set_image(img->multi.frames[0].im);
300 imlib_free_image();
301 img->multi.cnt = 0;
302 img->multi.animate = false;
303 }
304
305 imlib_context_set_image(img->im);
306
307 return !err;
308}
309#endif /* HAVE_GIFLIB */
310
311bool img_load(img_t *img, const fileinfo_t *file)
312{
313 const char *fmt;
314
315 if (img == NULL || file == NULL || file->name == NULL || file->path == NULL)
316 return false;
317
318 if (access(file->path, R_OK) < 0 ||
319 (img->im = imlib_load_image(file->path)) == NULL)
320 {
321 warn("could not open image: %s", file->name);
322 return false;
323 }
324
325 imlib_context_set_image(img->im);
326 imlib_image_set_changes_on_disk();
327
328 if ((fmt = imlib_image_format()) == NULL) {
329 warn("could not open image: %s", file->name);
330 return false;
331 }
332 if (STREQ(fmt, "jpeg"))
333 exif_auto_orientate(file);
334#if HAVE_GIFLIB
335 if (STREQ(fmt, "gif"))
336 img_load_gif(img, file);
337#endif
338
339 img_apply_gamma(img);
340
341 img->w = imlib_image_get_width();
342 img->h = imlib_image_get_height();
343 img->scalemode = options->scalemode;
344 img->re = false;
345 img->checkpan = false;
346 img->dirty = true;
347
348 return true;
349}
350
351void img_close(img_t *img, bool decache)
352{
353 int i;
354
355 if (img == NULL)
356 return;
357
358 if (img->multi.cnt > 0) {
359 for (i = 0; i < img->multi.cnt; i++) {
360 imlib_context_set_image(img->multi.frames[i].im);
361 imlib_free_image();
362 }
363 img->multi.cnt = 0;
364 img->im = NULL;
365 } else if (img->im != NULL) {
366 imlib_context_set_image(img->im);
367 if (decache)
368 imlib_free_image_and_decache();
369 else
370 imlib_free_image();
371 img->im = NULL;
372 }
373
374 if (img->cmod)
375 imlib_context_set_color_modifier(NULL);
376}
377
378void img_check_pan(img_t *img, bool moved)
379{
380 win_t *win;
381 int ox, oy;
382
383 if (img == NULL || img->im == NULL || img->win == NULL)
384 return;
385
386 win = img->win;
387 ox = img->x;
388 oy = img->y;
389
390 if (img->w * img->zoom > win->w) {
391 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
392 img->x = 0;
393 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
394 img->x = win->w - img->w * img->zoom;
395 } else {
396 img->x = (win->w - img->w * img->zoom) / 2;
397 }
398 if (img->h * img->zoom > win->h) {
399 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
400 img->y = 0;
401 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
402 img->y = win->h - img->h * img->zoom;
403 } else {
404 img->y = (win->h - img->h * img->zoom) / 2;
405 }
406
407 if (!moved && (ox != img->x || oy != img->y))
408 img->dirty = true;
409}
410
411bool img_fit(img_t *img)
412{
413 float z, zmax, zw, zh;
414
415 if (img == NULL || img->im == NULL || img->win == NULL)
416 return false;
417 if (img->scalemode == SCALE_ZOOM)
418 return false;
419
420 zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
421 zw = (float) img->win->w / (float) img->w;
422 zh = (float) img->win->h / (float) img->h;
423
424 switch (img->scalemode) {
425 case SCALE_WIDTH:
426 z = zw;
427 break;
428 case SCALE_HEIGHT:
429 z = zh;
430 break;
431 default:
432 z = MIN(zw, zh);
433 break;
434 }
435
436 z = MAX(z, zoom_min);
437 z = MIN(z, zmax);
438
439 if (zoomdiff(z, img->zoom) != 0) {
440 img->zoom = z;
441 img->dirty = true;
442 return true;
443 } else {
444 return false;
445 }
446}
447
448void img_render(img_t *img)
449{
450 win_t *win;
451 int sx, sy, sw, sh;
452 int dx, dy, dw, dh;
453
454 if (img == NULL || img->im == NULL || img->win == NULL)
455 return;
456
457 win = img->win;
458 img_fit(img);
459
460 if (!img->re) {
461 /* rendered for the first time */
462 img->re = true;
463 if (img->zoom * img->w <= win->w)
464 img->x = (win->w - img->w * img->zoom) / 2;
465 else
466 img->x = 0;
467 if (img->zoom * img->h <= win->h)
468 img->y = (win->h - img->h * img->zoom) / 2;
469 else
470 img->y = 0;
471 }
472
473 if (img->checkpan) {
474 img_check_pan(img, false);
475 img->checkpan = false;
476 }
477
478 if (!img->dirty)
479 return;
480
481 /* calculate source and destination offsets */
482 if (img->x < 0) {
483 sx = -img->x / img->zoom;
484 sw = win->w / img->zoom;
485 dx = 0;
486 dw = win->w;
487 } else {
488 sx = 0;
489 sw = img->w;
490 dx = img->x;
491 dw = img->w * img->zoom;
492 }
493 if (img->y < 0) {
494 sy = -img->y / img->zoom;
495 sh = win->h / img->zoom;
496 dy = 0;
497 dh = win->h;
498 } else {
499 sy = 0;
500 sh = img->h;
501 dy = img->y;
502 dh = img->h * img->zoom;
503 }
504
505 win_clear(win);
506
507 imlib_context_set_image(img->im);
508 imlib_context_set_anti_alias(img->aa);
509
510 if (!img->alpha && imlib_image_has_alpha())
511 win_draw_rect(win, win->pm, dx, dy, dw, dh, True, 0, win->white);
512
513 imlib_context_set_drawable(win->pm);
514 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
515
516 img->dirty = false;
517}
518
519bool img_fit_win(img_t *img, scalemode_t sm)
520{
521 if (img == NULL || img->im == NULL)
522 return false;
523
524 img->scalemode = sm;
525 return img_fit(img);
526}
527
528bool img_center(img_t *img)
529{
530 int ox, oy;
531
532 if (img == NULL || img->im == NULL || img->win == NULL)
533 return false;
534
535 ox = img->x;
536 oy = img->y;
537
538 img->x = (img->win->w - img->w * img->zoom) / 2;
539 img->y = (img->win->h - img->h * img->zoom) / 2;
540
541 if (ox != img->x || oy != img->y) {
542 img->dirty = true;
543 return true;
544 } else {
545 return false;
546 }
547}
548
549bool img_zoom(img_t *img, float z)
550{
551 if (img == NULL || img->im == NULL || img->win == NULL)
552 return false;
553
554 z = MAX(z, zoom_min);
555 z = MIN(z, zoom_max);
556
557 img->scalemode = SCALE_ZOOM;
558
559 if (zoomdiff(z, img->zoom) != 0) {
560 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
561 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
562 img->zoom = z;
563 img->checkpan = true;
564 img->dirty = true;
565 return true;
566 } else {
567 return false;
568 }
569}
570
571bool img_zoom_in(img_t *img)
572{
573 int i;
574 float z;
575
576 if (img == NULL || img->im == NULL)
577 return false;
578
579 for (i = 1; i < ARRLEN(zoom_levels); i++) {
580 z = zoom_levels[i] / 100.0;
581 if (zoomdiff(z, img->zoom) > 0)
582 return img_zoom(img, z);
583 }
584 return false;
585}
586
587bool img_zoom_out(img_t *img)
588{
589 int i;
590 float z;
591
592 if (img == NULL || img->im == NULL)
593 return false;
594
595 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
596 z = zoom_levels[i] / 100.0;
597 if (zoomdiff(z, img->zoom) < 0)
598 return img_zoom(img, z);
599 }
600 return false;
601}
602
603bool img_move(img_t *img, float dx, float dy)
604{
605 float ox, oy;
606
607 if (img == NULL || img->im == NULL)
608 return false;
609
610 ox = img->x;
611 oy = img->y;
612
613 img->x += dx;
614 img->y += dy;
615
616 img_check_pan(img, true);
617
618 if (ox != img->x || oy != img->y) {
619 img->dirty = true;
620 return true;
621 } else {
622 return false;
623 }
624}
625
626bool img_pan(img_t *img, direction_t dir, int d)
627{
628 /* d < 0: screen-wise
629 * d = 0: 1/5 of screen
630 * d > 0: num of pixels
631 */
632 float x, y;
633
634 if (img == NULL || img->im == NULL || img->win == NULL)
635 return false;
636
637 if (d > 0) {
638 x = y = MAX(1, (float) d * img->zoom);
639 } else {
640 x = img->win->w / (d < 0 ? 1 : 5);
641 y = img->win->h / (d < 0 ? 1 : 5);
642 }
643
644 switch (dir) {
645 case DIR_LEFT:
646 return img_move(img, x, 0.0);
647 case DIR_RIGHT:
648 return img_move(img, -x, 0.0);
649 case DIR_UP:
650 return img_move(img, 0.0, y);
651 case DIR_DOWN:
652 return img_move(img, 0.0, -y);
653 }
654 return false;
655}
656
657bool img_pan_edge(img_t *img, direction_t dir)
658{
659 int ox, oy;
660
661 if (img == NULL || img->im == NULL || img->win == NULL)
662 return false;
663
664 ox = img->x;
665 oy = img->y;
666
667 switch (dir) {
668 case DIR_LEFT:
669 img->x = 0;
670 break;
671 case DIR_RIGHT:
672 img->x = img->win->w - img->w * img->zoom;
673 break;
674 case DIR_UP:
675 img->y = 0;
676 break;
677 case DIR_DOWN:
678 img->y = img->win->h - img->h * img->zoom;
679 break;
680 }
681
682 img_check_pan(img, true);
683
684 if (ox != img->x || oy != img->y) {
685 img->dirty = true;
686 return true;
687 } else {
688 return false;
689 }
690}
691
692void img_rotate(img_t *img, degree_t d)
693{
694 int ox, oy, tmp;
695
696 if (img == NULL || img->im == NULL || img->win == NULL)
697 return;
698
699 imlib_context_set_image(img->im);
700 imlib_image_orientate(d);
701
702 if (d == DEGREE_90 || d == DEGREE_270) {
703 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
704 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
705
706 img->x = oy + (img->win->w - img->win->h) / 2;
707 img->y = ox + (img->win->h - img->win->w) / 2;
708
709 tmp = img->w;
710 img->w = img->h;
711 img->h = tmp;
712 img->checkpan = true;
713 }
714
715 img->dirty = true;
716}
717
718void img_flip(img_t *img, flipdir_t d)
719{
720 if (img == NULL || img->im == NULL)
721 return;
722
723 imlib_context_set_image(img->im);
724
725 switch (d) {
726 case FLIP_HORIZONTAL:
727 imlib_image_flip_horizontal();
728 break;
729 case FLIP_VERTICAL:
730 imlib_image_flip_vertical();
731 break;
732 }
733 img->dirty = true;
734}
735
736void img_toggle_antialias(img_t *img)
737{
738 if (img == NULL || img->im == NULL)
739 return;
740
741 img->aa = !img->aa;
742 imlib_context_set_image(img->im);
743 imlib_context_set_anti_alias(img->aa);
744 img->dirty = true;
745}
746
747bool img_change_gamma(img_t *img, int d)
748{
749 /* d < 0: decrease gamma
750 * d = 0: reset gamma
751 * d > 0: increase gamma
752 */
753 int gamma;
754
755 if (img == NULL || img->im == NULL)
756 return false;
757
758 if (d == 0)
759 gamma = 0;
760 else if (d < 0)
761 gamma = MAX(-GAMMA_RANGE, img->gamma - 1);
762 else
763 gamma = MIN(+GAMMA_RANGE, img->gamma + 1);
764
765 if (img->gamma != gamma) {
766 img->gamma = gamma;
767 img_apply_gamma(img);
768 img->dirty = true;
769 return true;
770 } else {
771 return false;
772 }
773}
774
775bool img_frame_goto(img_t *img, int n)
776{
777 if (img == NULL || img->im == NULL)
778 return false;
779 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
780 return false;
781
782 img->multi.sel = n;
783 img->im = img->multi.frames[n].im;
784
785 imlib_context_set_image(img->im);
786 img->w = imlib_image_get_width();
787 img->h = imlib_image_get_height();
788 img->checkpan = true;
789 img->dirty = true;
790
791 return true;
792}
793
794bool img_frame_navigate(img_t *img, int d)
795{
796 if (img == NULL|| img->im == NULL || img->multi.cnt == 0 || d == 0)
797 return false;
798
799 d += img->multi.sel;
800 if (d < 0)
801 d = 0;
802 else if (d >= img->multi.cnt)
803 d = img->multi.cnt - 1;
804
805 return img_frame_goto(img, d);
806}
807
808bool img_frame_animate(img_t *img, bool restart)
809{
810 if (img == NULL || img->im == NULL || img->multi.cnt == 0)
811 return false;
812
813 if (img->multi.sel + 1 >= img->multi.cnt) {
814 if (GIF_LOOP == 1 || (GIF_LOOP == -1 && img->multi.anim_repeats == 0) ) {
815 img_frame_goto(img, 0);
816 } else if(restart) {
817 img_frame_goto(img, 0);
818 img->multi.repeats_currently_left =
819 (img->multi.anim_repeats != -1 ? img->multi.anim_repeats : 0);
820 } else if(GIF_LOOP == -1 && img->multi.repeats_currently_left != 0) {
821 img_frame_goto(img, 0);
822 --img->multi.repeats_currently_left;
823 } else {
824 img->multi.animate = false;
825 return false;
826 }
827 } else if (!restart) {
828 img_frame_goto(img, img->multi.sel + 1);
829 }
830 img->multi.animate = true;
831 img->dirty = true;
832
833 return true;
834}