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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(float z1, float z2)
43{
44 return (int) (z1 * 1000.0 - z2 * 1000.0);
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 int ox, oy;
370 float w, h;
371
372 win = img->win;
373 w = img->w * img->zoom;
374 h = img->h * img->zoom;
375 ox = img->x;
376 oy = img->y;
377
378 if (w < win->w)
379 img->x = (win->w - w) / 2;
380 else if (img->x > 0)
381 img->x = 0;
382 else if (img->x + w < win->w)
383 img->x = win->w - w;
384 if (h < win->h)
385 img->y = (win->h - h) / 2;
386 else if (img->y > 0)
387 img->y = 0;
388 else if (img->y + h < win->h)
389 img->y = win->h - h;
390
391 if (!moved && (ox != img->x || oy != img->y))
392 img->dirty = true;
393}
394
395bool img_fit(img_t *img)
396{
397 float z, zmax, zw, zh;
398
399 if (img->scalemode == SCALE_ZOOM)
400 return false;
401
402 zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
403 zw = (float) img->win->w / (float) img->w;
404 zh = (float) img->win->h / (float) img->h;
405
406 switch (img->scalemode) {
407 case SCALE_WIDTH:
408 z = zw;
409 break;
410 case SCALE_HEIGHT:
411 z = zh;
412 break;
413 default:
414 z = MIN(zw, zh);
415 break;
416 }
417
418 z = MAX(z, zoom_min);
419 z = MIN(z, zmax);
420
421 if (zoomdiff(z, img->zoom) != 0) {
422 img->zoom = z;
423 img->dirty = true;
424 return true;
425 } else {
426 return false;
427 }
428}
429
430void img_render(img_t *img)
431{
432 win_t *win;
433 int sx, sy, sw, sh;
434 int dx, dy, dw, dh;
435 Imlib_Image bg;
436 unsigned long c;
437
438 win = img->win;
439 img_fit(img);
440
441 if (img->checkpan) {
442 img_check_pan(img, false);
443 img->checkpan = false;
444 }
445
446 if (!img->dirty)
447 return;
448
449 /* calculate source and destination offsets:
450 * - part of image drawn on full window, or
451 * - full image drawn on part of window
452 */
453 if (img->x <= 0) {
454 sx = -img->x / img->zoom + 0.5;
455 sw = win->w / img->zoom;
456 dx = 0;
457 dw = win->w;
458 } else {
459 sx = 0;
460 sw = img->w;
461 dx = img->x;
462 dw = img->w * img->zoom;
463 }
464 if (img->y <= 0) {
465 sy = -img->y / img->zoom + 0.5;
466 sh = win->h / img->zoom;
467 dy = 0;
468 dh = win->h;
469 } else {
470 sy = 0;
471 sh = img->h;
472 dy = img->y;
473 dh = img->h * img->zoom;
474 }
475
476 win_clear(win);
477
478 imlib_context_set_image(img->im);
479 imlib_context_set_anti_alias(img->aa);
480 imlib_context_set_drawable(win->buf.pm);
481
482 if (imlib_image_has_alpha()) {
483 if ((bg = imlib_create_image(dw, dh)) == NULL)
484 error(EXIT_FAILURE, ENOMEM, NULL);
485 imlib_context_set_image(bg);
486 imlib_image_set_has_alpha(0);
487
488 if (img->alpha) {
489 int i, c, r;
490 DATA32 col[2] = { 0xFF666666, 0xFF999999 };
491 DATA32 * data = imlib_image_get_data();
492
493 for (r = 0; r < dh; r++) {
494 i = r * dw;
495 if (r == 0 || r == 8) {
496 for (c = 0; c < dw; c++)
497 data[i++] = col[!(c & 8) ^ !r];
498 } else {
499 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
500 }
501 }
502 imlib_image_put_back_data(data);
503 } else {
504 c = win->fullscreen ? win->fscol.pixel : win->bgcol.pixel;
505 imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
506 imlib_image_fill_rectangle(0, 0, dw, dh);
507 }
508 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
509 imlib_context_set_color_modifier(NULL);
510 imlib_render_image_on_drawable(dx, dy);
511 imlib_free_image();
512 imlib_context_set_color_modifier(img->cmod);
513 } else {
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 float oz;
522
523 oz = img->zoom;
524 img->scalemode = sm;
525
526 if (img_fit(img)) {
527 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
528 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
529 img->checkpan = true;
530 return true;
531 } else {
532 return false;
533 }
534}
535
536bool img_zoom(img_t *img, float z)
537{
538 z = MAX(z, zoom_min);
539 z = MIN(z, zoom_max);
540
541 img->scalemode = SCALE_ZOOM;
542
543 if (zoomdiff(z, img->zoom) != 0) {
544 int x, y;
545
546 win_cursor_pos(img->win, &x, &y);
547 if (x < 0 || x >= img->win->w || y < 0 || y >= img->win->h) {
548 x = img->win->w / 2;
549 y = img->win->h / 2;
550 }
551 img->x = x - (x - img->x) * z / img->zoom;
552 img->y = y - (y - 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 for (i = 1; i < ARRLEN(zoom_levels); i++) {
568 z = zoom_levels[i] / 100.0;
569 if (zoomdiff(z, img->zoom) > 0)
570 return img_zoom(img, z);
571 }
572 return false;
573}
574
575bool img_zoom_out(img_t *img)
576{
577 int i;
578 float z;
579
580 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
581 z = zoom_levels[i] / 100.0;
582 if (zoomdiff(z, img->zoom) < 0)
583 return img_zoom(img, z);
584 }
585 return false;
586}
587
588bool img_pos(img_t *img, float x, float y)
589{
590 float ox, oy;
591
592 ox = img->x;
593 oy = img->y;
594
595 img->x = x;
596 img->y = y;
597
598 img_check_pan(img, true);
599
600 if (ox != img->x || oy != img->y) {
601 img->dirty = true;
602 return true;
603 } else {
604 return false;
605 }
606}
607
608bool img_move(img_t *img, float dx, float dy)
609{
610 return img_pos(img, img->x + dx, img->y + dy);
611}
612
613bool img_pan(img_t *img, direction_t dir, int d)
614{
615 /* d < 0: screen-wise
616 * d = 0: 1/PAN_FRACTION of screen
617 * d > 0: num of pixels
618 */
619 float x, y;
620
621 if (d > 0) {
622 x = y = MAX(1, (float) d * img->zoom);
623 } else {
624 x = img->win->w / (d < 0 ? 1 : PAN_FRACTION);
625 y = img->win->h / (d < 0 ? 1 : PAN_FRACTION);
626 }
627
628 switch (dir) {
629 case DIR_LEFT:
630 return img_move(img, x, 0.0);
631 case DIR_RIGHT:
632 return img_move(img, -x, 0.0);
633 case DIR_UP:
634 return img_move(img, 0.0, y);
635 case DIR_DOWN:
636 return img_move(img, 0.0, -y);
637 }
638 return false;
639}
640
641bool img_pan_edge(img_t *img, direction_t dir)
642{
643 int ox, oy;
644
645 ox = img->x;
646 oy = img->y;
647
648 if (dir & DIR_LEFT)
649 img->x = 0;
650 if (dir & DIR_RIGHT)
651 img->x = img->win->w - img->w * img->zoom;
652 if (dir & DIR_UP)
653 img->y = 0;
654 if (dir & DIR_DOWN)
655 img->y = img->win->h - img->h * img->zoom;
656
657 img_check_pan(img, true);
658
659 if (ox != img->x || oy != img->y) {
660 img->dirty = true;
661 return true;
662 } else {
663 return false;
664 }
665}
666
667void img_rotate(img_t *img, degree_t d)
668{
669 int i, ox, oy, tmp;
670
671 imlib_context_set_image(img->im);
672 imlib_image_orientate(d);
673
674 for (i = 0; i < img->multi.cnt; i++) {
675 if (i != img->multi.sel) {
676 imlib_context_set_image(img->multi.frames[i].im);
677 imlib_image_orientate(d);
678 }
679 }
680 if (d == DEGREE_90 || d == DEGREE_270) {
681 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
682 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
683
684 img->x = oy + (img->win->w - img->win->h) / 2;
685 img->y = ox + (img->win->h - img->win->w) / 2;
686
687 tmp = img->w;
688 img->w = img->h;
689 img->h = tmp;
690 img->checkpan = true;
691 }
692 img->dirty = true;
693}
694
695void img_flip(img_t *img, flipdir_t d)
696{
697 int i;
698 void (*imlib_flip_op[3])(void) = {
699 imlib_image_flip_horizontal,
700 imlib_image_flip_vertical,
701 imlib_image_flip_diagonal
702 };
703
704 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
705
706 if (d < 0 || d >= ARRLEN(imlib_flip_op))
707 return;
708
709 imlib_context_set_image(img->im);
710 imlib_flip_op[d]();
711
712 for (i = 0; i < img->multi.cnt; i++) {
713 if (i != img->multi.sel) {
714 imlib_context_set_image(img->multi.frames[i].im);
715 imlib_flip_op[d]();
716 }
717 }
718 img->dirty = true;
719}
720
721void img_toggle_antialias(img_t *img)
722{
723 img->aa = !img->aa;
724 imlib_context_set_image(img->im);
725 imlib_context_set_anti_alias(img->aa);
726 img->dirty = true;
727}
728
729bool img_change_gamma(img_t *img, int d)
730{
731 /* d < 0: decrease gamma
732 * d = 0: reset gamma
733 * d > 0: increase gamma
734 */
735 int gamma;
736 double range;
737
738 if (d == 0)
739 gamma = 0;
740 else
741 gamma = MIN(MAX(img->gamma + d, -GAMMA_RANGE), GAMMA_RANGE);
742
743 if (img->gamma != gamma) {
744 imlib_reset_color_modifier();
745 if (gamma != 0) {
746 range = gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
747 imlib_modify_color_modifier_gamma(1.0 + gamma * (range / GAMMA_RANGE));
748 }
749 img->gamma = gamma;
750 img->dirty = true;
751 return true;
752 } else {
753 return false;
754 }
755}
756
757bool img_frame_goto(img_t *img, int n)
758{
759 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
760 return false;
761
762 img->multi.sel = n;
763 img->im = img->multi.frames[n].im;
764
765 imlib_context_set_image(img->im);
766 img->w = imlib_image_get_width();
767 img->h = imlib_image_get_height();
768 img->checkpan = true;
769 img->dirty = true;
770
771 return true;
772}
773
774bool img_frame_navigate(img_t *img, int d)
775{
776 if (img->multi.cnt == 0 || d == 0)
777 return false;
778
779 d += img->multi.sel;
780 if (d < 0)
781 d = 0;
782 else if (d >= img->multi.cnt)
783 d = img->multi.cnt - 1;
784
785 return img_frame_goto(img, d);
786}
787
788bool img_frame_animate(img_t *img)
789{
790 if (img->multi.cnt == 0)
791 return false;
792
793 if (img->multi.sel + 1 >= img->multi.cnt)
794 img_frame_goto(img, 0);
795 else
796 img_frame_goto(img, img->multi.sel + 1);
797 img->dirty = true;
798 return true;
799}
800