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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#include "sxiv.h"
20#define _IMAGE_CONFIG
21#include "config.h"
22
23#include <errno.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/stat.h>
27#include <sys/types.h>
28#include <unistd.h>
29
30#if HAVE_LIBEXIF
31#include <libexif/exif-data.h>
32#endif
33
34#if HAVE_GIFLIB
35#include <gif_lib.h>
36enum { DEF_GIF_DELAY = 75 };
37#endif
38
39float zoom_min;
40float zoom_max;
41
42static int zoomdiff(img_t *img, float z)
43{
44 return (int) ((img->w * z - img->w * img->zoom) + (img->h * z - img->h * img->zoom));
45}
46
47void img_init(img_t *img, win_t *win)
48{
49 zoom_min = zoom_levels[0] / 100.0;
50 zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
51
52 imlib_context_set_display(win->env.dpy);
53 imlib_context_set_visual(win->env.vis);
54 imlib_context_set_colormap(win->env.cmap);
55
56 img->im = NULL;
57 img->win = win;
58 img->scalemode = options->scalemode;
59 img->zoom = options->zoom;
60 img->zoom = MAX(img->zoom, zoom_min);
61 img->zoom = MIN(img->zoom, zoom_max);
62 img->checkpan = false;
63 img->dirty = false;
64 img->aa = ANTI_ALIAS;
65 img->alpha = ALPHA_LAYER;
66 img->multi.cap = img->multi.cnt = 0;
67 img->multi.animate = options->animate;
68 img->multi.framedelay = options->framerate > 0 ? 1000 / options->framerate : 0;
69 img->multi.length = 0;
70
71 img->cmod = imlib_create_color_modifier();
72 imlib_context_set_color_modifier(img->cmod);
73 img->gamma = MIN(MAX(options->gamma, -GAMMA_RANGE), GAMMA_RANGE);
74
75 img->ss.on = options->slideshow > 0;
76 img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY * 10;
77}
78
79#if HAVE_LIBEXIF
80void exif_auto_orientate(const fileinfo_t *file)
81{
82 ExifData *ed;
83 ExifEntry *entry;
84 int byte_order, orientation = 0;
85
86 if ((ed = exif_data_new_from_file(file->path)) == NULL)
87 return;
88 byte_order = exif_data_get_byte_order(ed);
89 entry = exif_content_get_entry(ed->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION);
90 if (entry != NULL)
91 orientation = exif_get_short(entry->data, byte_order);
92 exif_data_unref(ed);
93
94 switch (orientation) {
95 case 5:
96 imlib_image_orientate(1);
97 case 2:
98 imlib_image_flip_vertical();
99 break;
100 case 3:
101 imlib_image_orientate(2);
102 break;
103 case 7:
104 imlib_image_orientate(1);
105 case 4:
106 imlib_image_flip_horizontal();
107 break;
108 case 6:
109 imlib_image_orientate(1);
110 break;
111 case 8:
112 imlib_image_orientate(3);
113 break;
114 }
115}
116#endif
117
118#if HAVE_GIFLIB
119bool img_load_gif(img_t *img, const fileinfo_t *file)
120{
121 GifFileType *gif;
122 GifRowType *rows = NULL;
123 GifRecordType rec;
124 ColorMapObject *cmap;
125 DATA32 bgpixel, *data, *ptr;
126 DATA32 *prev_frame = NULL;
127 Imlib_Image im;
128 int i, j, bg, r, g, b;
129 int x, y, w, h, sw, sh;
130 int px, py, pw, ph;
131 int intoffset[] = { 0, 4, 2, 1 };
132 int intjump[] = { 8, 8, 4, 2 };
133 int transp = -1;
134 unsigned int disposal = 0, prev_disposal = 0;
135 unsigned int delay = 0;
136 bool err = false;
137
138 if (img->multi.cap == 0) {
139 img->multi.cap = 8;
140 img->multi.frames = (img_frame_t*)
141 emalloc(sizeof(img_frame_t) * img->multi.cap);
142 }
143 img->multi.cnt = img->multi.sel = 0;
144 img->multi.length = 0;
145
146#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
147 gif = DGifOpenFileName(file->path, NULL);
148#else
149 gif = DGifOpenFileName(file->path);
150#endif
151 if (gif == NULL) {
152 error(0, 0, "%s: Error opening gif image", file->name);
153 return false;
154 }
155 bg = gif->SBackGroundColor;
156 sw = gif->SWidth;
157 sh = gif->SHeight;
158 px = py = pw = ph = 0;
159
160 do {
161 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
162 err = true;
163 break;
164 }
165 if (rec == EXTENSION_RECORD_TYPE) {
166 int ext_code;
167 GifByteType *ext = NULL;
168
169 DGifGetExtension(gif, &ext_code, &ext);
170 while (ext) {
171 if (ext_code == GRAPHICS_EXT_FUNC_CODE) {
172 if (ext[1] & 1)
173 transp = (int) ext[4];
174 else
175 transp = -1;
176
177 delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
178 disposal = (unsigned int) ext[1] >> 2 & 0x7;
179 }
180 ext = NULL;
181 DGifGetExtensionNext(gif, &ext);
182 }
183 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
184 if (DGifGetImageDesc(gif) == GIF_ERROR) {
185 err = true;
186 break;
187 }
188 x = gif->Image.Left;
189 y = gif->Image.Top;
190 w = gif->Image.Width;
191 h = gif->Image.Height;
192
193 rows = (GifRowType*) emalloc(h * sizeof(GifRowType));
194 for (i = 0; i < h; i++)
195 rows[i] = (GifRowType) emalloc(w * sizeof(GifPixelType));
196 if (gif->Image.Interlace) {
197 for (i = 0; i < 4; i++) {
198 for (j = intoffset[i]; j < h; j += intjump[i])
199 DGifGetLine(gif, rows[j], w);
200 }
201 } else {
202 for (i = 0; i < h; i++)
203 DGifGetLine(gif, rows[i], w);
204 }
205
206 ptr = data = (DATA32*) emalloc(sizeof(DATA32) * sw * sh);
207 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
208 r = cmap->Colors[bg].Red;
209 g = cmap->Colors[bg].Green;
210 b = cmap->Colors[bg].Blue;
211 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
212
213 for (i = 0; i < sh; i++) {
214 for (j = 0; j < sw; j++) {
215 if (i < y || i >= y + h || j < x || j >= x + w ||
216 rows[i-y][j-x] == transp)
217 {
218 if (prev_frame != NULL && (prev_disposal != 2 ||
219 i < py || i >= py + ph || j < px || j >= px + pw))
220 {
221 *ptr = prev_frame[i * sw + j];
222 } else {
223 *ptr = bgpixel;
224 }
225 } else {
226 r = cmap->Colors[rows[i-y][j-x]].Red;
227 g = cmap->Colors[rows[i-y][j-x]].Green;
228 b = cmap->Colors[rows[i-y][j-x]].Blue;
229 *ptr = 0xffu << 24 | r << 16 | g << 8 | b;
230 }
231 ptr++;
232 }
233 }
234
235 im = imlib_create_image_using_copied_data(sw, sh, data);
236
237 for (i = 0; i < h; i++)
238 free(rows[i]);
239 free(rows);
240 free(data);
241
242 if (im == NULL) {
243 err = true;
244 break;
245 }
246
247 imlib_context_set_image(im);
248 imlib_image_set_format("gif");
249 if (transp >= 0)
250 imlib_image_set_has_alpha(1);
251
252 if (disposal != 3)
253 prev_frame = imlib_image_get_data_for_reading_only();
254 prev_disposal = disposal;
255 px = x, py = y, pw = w, ph = h;
256
257 if (img->multi.cnt == img->multi.cap) {
258 img->multi.cap *= 2;
259 img->multi.frames = (img_frame_t*)
260 erealloc(img->multi.frames,
261 img->multi.cap * sizeof(img_frame_t));
262 }
263 img->multi.frames[img->multi.cnt].im = im;
264 delay = img->multi.framedelay > 0 ? img->multi.framedelay : delay;
265 img->multi.frames[img->multi.cnt].delay = delay > 0 ? delay : DEF_GIF_DELAY;
266 img->multi.length += img->multi.frames[img->multi.cnt].delay;
267 img->multi.cnt++;
268 }
269 } while (rec != TERMINATE_RECORD_TYPE);
270
271#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
272 DGifCloseFile(gif, NULL);
273#else
274 DGifCloseFile(gif);
275#endif
276
277 if (err && (file->flags & FF_WARN))
278 error(0, 0, "%s: Corrupted gif file", file->name);
279
280 if (img->multi.cnt > 1) {
281 imlib_context_set_image(img->im);
282 imlib_free_image();
283 img->im = img->multi.frames[0].im;
284 } else if (img->multi.cnt == 1) {
285 imlib_context_set_image(img->multi.frames[0].im);
286 imlib_free_image();
287 img->multi.cnt = 0;
288 }
289
290 imlib_context_set_image(img->im);
291
292 return !err;
293}
294#endif /* HAVE_GIFLIB */
295
296Imlib_Image img_open(const fileinfo_t *file)
297{
298 struct stat st;
299 Imlib_Image im = NULL;
300
301 if (access(file->path, R_OK) == 0 &&
302 stat(file->path, &st) == 0 && S_ISREG(st.st_mode))
303 {
304 im = imlib_load_image(file->path);
305 if (im != NULL) {
306 imlib_context_set_image(im);
307 if (imlib_image_get_data_for_reading_only() == NULL) {
308 imlib_free_image();
309 im = NULL;
310 }
311 }
312 }
313 if (im == NULL && (file->flags & FF_WARN))
314 error(0, 0, "%s: Error opening image", file->name);
315 return im;
316}
317
318bool img_load(img_t *img, const fileinfo_t *file)
319{
320 const char *fmt;
321
322 if ((img->im = img_open(file)) == NULL)
323 return false;
324
325 imlib_image_set_changes_on_disk();
326
327#if HAVE_LIBEXIF
328 exif_auto_orientate(file);
329#endif
330
331 if ((fmt = imlib_image_format()) != NULL) {
332#if HAVE_GIFLIB
333 if (STREQ(fmt, "gif"))
334 img_load_gif(img, file);
335#endif
336 }
337 img->w = imlib_image_get_width();
338 img->h = imlib_image_get_height();
339 img->checkpan = true;
340 img->dirty = true;
341
342 return true;
343}
344
345CLEANUP void img_close(img_t *img, bool decache)
346{
347 int i;
348
349 if (img->multi.cnt > 0) {
350 for (i = 0; i < img->multi.cnt; i++) {
351 imlib_context_set_image(img->multi.frames[i].im);
352 imlib_free_image();
353 }
354 img->multi.cnt = 0;
355 img->im = NULL;
356 } else if (img->im != NULL) {
357 imlib_context_set_image(img->im);
358 if (decache)
359 imlib_free_image_and_decache();
360 else
361 imlib_free_image();
362 img->im = NULL;
363 }
364}
365
366void img_check_pan(img_t *img, bool moved)
367{
368 win_t *win;
369 float w, h, ox, oy;
370
371 win = img->win;
372 w = img->w * img->zoom;
373 h = img->h * img->zoom;
374 ox = img->x;
375 oy = img->y;
376
377 if (w < win->w)
378 img->x = (win->w - w) / 2;
379 else if (img->x > 0)
380 img->x = 0;
381 else if (img->x + w < win->w)
382 img->x = win->w - w;
383 if (h < win->h)
384 img->y = (win->h - h) / 2;
385 else if (img->y > 0)
386 img->y = 0;
387 else if (img->y + h < win->h)
388 img->y = win->h - h;
389
390 if (!moved && (ox != img->x || oy != img->y))
391 img->dirty = true;
392}
393
394bool img_fit(img_t *img)
395{
396 float z, zw, zh;
397
398 if (img->scalemode == SCALE_ZOOM)
399 return false;
400
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 z = MIN(z, img->scalemode == SCALE_DOWN ? 1.0 : zoom_max);
416
417 if (zoomdiff(img, z) != 0) {
418 img->zoom = z;
419 img->dirty = true;
420 return true;
421 } else {
422 return false;
423 }
424}
425
426void img_render(img_t *img)
427{
428 win_t *win;
429 int sx, sy, sw, sh;
430 int dx, dy, dw, dh;
431 Imlib_Image bg;
432 unsigned long c;
433
434 win = img->win;
435 img_fit(img);
436
437 if (img->checkpan) {
438 img_check_pan(img, false);
439 img->checkpan = false;
440 }
441
442 if (!img->dirty)
443 return;
444
445 /* calculate source and destination offsets:
446 * - part of image drawn on full window, or
447 * - full image drawn on part of window
448 */
449 if (img->x <= 0) {
450 sx = -img->x / img->zoom + 0.5;
451 sw = win->w / img->zoom;
452 dx = 0;
453 dw = win->w;
454 } else {
455 sx = 0;
456 sw = img->w;
457 dx = img->x;
458 dw = img->w * img->zoom;
459 }
460 if (img->y <= 0) {
461 sy = -img->y / img->zoom + 0.5;
462 sh = win->h / img->zoom;
463 dy = 0;
464 dh = win->h;
465 } else {
466 sy = 0;
467 sh = img->h;
468 dy = img->y;
469 dh = img->h * img->zoom;
470 }
471
472 win_clear(win);
473
474 imlib_context_set_image(img->im);
475 imlib_context_set_anti_alias(img->aa);
476 imlib_context_set_drawable(win->buf.pm);
477
478 if (imlib_image_has_alpha()) {
479 if ((bg = imlib_create_image(dw, dh)) == NULL)
480 error(EXIT_FAILURE, ENOMEM, NULL);
481 imlib_context_set_image(bg);
482 imlib_image_set_has_alpha(0);
483
484 if (img->alpha) {
485 int i, c, r;
486 DATA32 col[2] = { 0xFF666666, 0xFF999999 };
487 DATA32 * data = imlib_image_get_data();
488
489 for (r = 0; r < dh; r++) {
490 i = r * dw;
491 if (r == 0 || r == 8) {
492 for (c = 0; c < dw; c++)
493 data[i++] = col[!(c & 8) ^ !r];
494 } else {
495 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
496 }
497 }
498 imlib_image_put_back_data(data);
499 } else {
500 c = win->fullscreen ? win->fscol.pixel : win->bgcol.pixel;
501 imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
502 imlib_image_fill_rectangle(0, 0, dw, dh);
503 }
504 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
505 imlib_context_set_color_modifier(NULL);
506 imlib_render_image_on_drawable(dx, dy);
507 imlib_free_image();
508 imlib_context_set_color_modifier(img->cmod);
509 } else {
510 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
511 }
512 img->dirty = false;
513}
514
515bool img_fit_win(img_t *img, scalemode_t sm)
516{
517 float oz;
518
519 oz = img->zoom;
520 img->scalemode = sm;
521
522 if (img_fit(img)) {
523 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
524 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
525 img->checkpan = true;
526 return true;
527 } else {
528 return false;
529 }
530}
531
532bool img_zoom(img_t *img, float z)
533{
534 z = MAX(z, zoom_min);
535 z = MIN(z, zoom_max);
536
537 img->scalemode = SCALE_ZOOM;
538
539 if (zoomdiff(img, z) != 0) {
540 int x, y;
541
542 win_cursor_pos(img->win, &x, &y);
543 if (x < 0 || x >= img->win->w || y < 0 || y >= img->win->h) {
544 x = img->win->w / 2;
545 y = img->win->h / 2;
546 }
547 img->x = x - (x - img->x) * z / img->zoom;
548 img->y = y - (y - img->y) * z / img->zoom;
549 img->zoom = z;
550 img->checkpan = true;
551 img->dirty = true;
552 return true;
553 } else {
554 return false;
555 }
556}
557
558bool img_zoom_in(img_t *img)
559{
560 int i;
561 float z;
562
563 for (i = 0; i < ARRLEN(zoom_levels); i++) {
564 z = zoom_levels[i] / 100.0;
565 if (zoomdiff(img, z) > 0)
566 return img_zoom(img, z);
567 }
568 return false;
569}
570
571bool img_zoom_out(img_t *img)
572{
573 int i;
574 float z;
575
576 for (i = ARRLEN(zoom_levels) - 1; i >= 0; i--) {
577 z = zoom_levels[i] / 100.0;
578 if (zoomdiff(img, z) < 0)
579 return img_zoom(img, z);
580 }
581 return false;
582}
583
584bool img_pos(img_t *img, float x, float y)
585{
586 float ox, oy;
587
588 ox = img->x;
589 oy = img->y;
590
591 img->x = x;
592 img->y = y;
593
594 img_check_pan(img, true);
595
596 if (ox != img->x || oy != img->y) {
597 img->dirty = true;
598 return true;
599 } else {
600 return false;
601 }
602}
603
604bool img_move(img_t *img, float dx, float dy)
605{
606 return img_pos(img, img->x + dx, img->y + dy);
607}
608
609bool img_pan(img_t *img, direction_t dir, int d)
610{
611 /* d < 0: screen-wise
612 * d = 0: 1/PAN_FRACTION of screen
613 * d > 0: num of pixels
614 */
615 float x, y;
616
617 if (d > 0) {
618 x = y = MAX(1, (float) d * img->zoom);
619 } else {
620 x = img->win->w / (d < 0 ? 1 : PAN_FRACTION);
621 y = img->win->h / (d < 0 ? 1 : PAN_FRACTION);
622 }
623
624 switch (dir) {
625 case DIR_LEFT:
626 return img_move(img, x, 0.0);
627 case DIR_RIGHT:
628 return img_move(img, -x, 0.0);
629 case DIR_UP:
630 return img_move(img, 0.0, y);
631 case DIR_DOWN:
632 return img_move(img, 0.0, -y);
633 }
634 return false;
635}
636
637bool img_pan_edge(img_t *img, direction_t dir)
638{
639 float ox, oy;
640
641 ox = img->x;
642 oy = img->y;
643
644 if (dir & DIR_LEFT)
645 img->x = 0;
646 if (dir & DIR_RIGHT)
647 img->x = img->win->w - img->w * img->zoom;
648 if (dir & DIR_UP)
649 img->y = 0;
650 if (dir & DIR_DOWN)
651 img->y = img->win->h - img->h * img->zoom;
652
653 img_check_pan(img, true);
654
655 if (ox != img->x || oy != img->y) {
656 img->dirty = true;
657 return true;
658 } else {
659 return false;
660 }
661}
662
663void img_rotate(img_t *img, degree_t d)
664{
665 int i, tmp;
666 float ox, oy;
667
668 imlib_context_set_image(img->im);
669 imlib_image_orientate(d);
670
671 for (i = 0; i < img->multi.cnt; i++) {
672 if (i != img->multi.sel) {
673 imlib_context_set_image(img->multi.frames[i].im);
674 imlib_image_orientate(d);
675 }
676 }
677 if (d == DEGREE_90 || d == DEGREE_270) {
678 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
679 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
680
681 img->x = oy + (img->win->w - img->win->h) / 2;
682 img->y = ox + (img->win->h - img->win->w) / 2;
683
684 tmp = img->w;
685 img->w = img->h;
686 img->h = tmp;
687 img->checkpan = true;
688 }
689 img->dirty = true;
690}
691
692void img_flip(img_t *img, flipdir_t d)
693{
694 int i;
695 void (*imlib_flip_op[3])(void) = {
696 imlib_image_flip_horizontal,
697 imlib_image_flip_vertical,
698 imlib_image_flip_diagonal
699 };
700
701 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
702
703 if (d < 0 || d >= ARRLEN(imlib_flip_op))
704 return;
705
706 imlib_context_set_image(img->im);
707 imlib_flip_op[d]();
708
709 for (i = 0; i < img->multi.cnt; i++) {
710 if (i != img->multi.sel) {
711 imlib_context_set_image(img->multi.frames[i].im);
712 imlib_flip_op[d]();
713 }
714 }
715 img->dirty = true;
716}
717
718void img_toggle_antialias(img_t *img)
719{
720 img->aa = !img->aa;
721 imlib_context_set_image(img->im);
722 imlib_context_set_anti_alias(img->aa);
723 img->dirty = true;
724}
725
726bool img_change_gamma(img_t *img, int d)
727{
728 /* d < 0: decrease gamma
729 * d = 0: reset gamma
730 * d > 0: increase gamma
731 */
732 int gamma;
733 double range;
734
735 if (d == 0)
736 gamma = 0;
737 else
738 gamma = MIN(MAX(img->gamma + d, -GAMMA_RANGE), GAMMA_RANGE);
739
740 if (img->gamma != gamma) {
741 imlib_reset_color_modifier();
742 if (gamma != 0) {
743 range = gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
744 imlib_modify_color_modifier_gamma(1.0 + gamma * (range / GAMMA_RANGE));
745 }
746 img->gamma = gamma;
747 img->dirty = true;
748 return true;
749 } else {
750 return false;
751 }
752}
753
754bool img_frame_goto(img_t *img, int n)
755{
756 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
757 return false;
758
759 img->multi.sel = n;
760 img->im = img->multi.frames[n].im;
761
762 imlib_context_set_image(img->im);
763 img->w = imlib_image_get_width();
764 img->h = imlib_image_get_height();
765 img->checkpan = true;
766 img->dirty = true;
767
768 return true;
769}
770
771bool img_frame_navigate(img_t *img, int d)
772{
773 if (img->multi.cnt == 0 || d == 0)
774 return false;
775
776 d += img->multi.sel;
777 if (d < 0)
778 d = 0;
779 else if (d >= img->multi.cnt)
780 d = img->multi.cnt - 1;
781
782 return img_frame_goto(img, d);
783}
784
785bool img_frame_animate(img_t *img)
786{
787 if (img->multi.cnt == 0)
788 return false;
789
790 if (img->multi.sel + 1 >= img->multi.cnt)
791 img_frame_goto(img, 0);
792 else
793 img_frame_goto(img, img->multi.sel + 1);
794 img->dirty = true;
795 return true;
796}
797