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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
49static void img_apply_gamma(img_t *img)
50{
51 if (img == NULL || img->im == NULL || img->cmod == NULL)
52 return;
53
54 if (img->gamma == 0) {
55 imlib_context_set_color_modifier(NULL);
56 } else {
57 double range = img->gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
58
59 imlib_context_set_color_modifier(img->cmod);
60 imlib_reset_color_modifier();
61 imlib_modify_color_modifier_gamma(1.0 + img->gamma * (range / GAMMA_RANGE));
62 }
63}
64
65void img_init(img_t *img, win_t *win)
66{
67 zoom_min = zoom_levels[0] / 100.0;
68 zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
69
70 if (img == NULL || win == NULL)
71 return;
72
73 imlib_context_set_display(win->env.dpy);
74 imlib_context_set_visual(win->env.vis);
75 imlib_context_set_colormap(win->env.cmap);
76
77 img->im = NULL;
78 img->win = win;
79 img->scalemode = options->scalemode;
80 img->zoom = options->zoom;
81 img->zoom = MAX(img->zoom, zoom_min);
82 img->zoom = MIN(img->zoom, zoom_max);
83 img->checkpan = false;
84 img->dirty = false;
85 img->aa = ANTI_ALIAS;
86 img->alpha = ALPHA_LAYER;
87 img->multi.cap = img->multi.cnt = 0;
88 img->multi.animate = options->animate;
89 img->multi.length = 0;
90
91 img->cmod = imlib_create_color_modifier();
92 img->gamma = MIN(MAX(options->gamma, -GAMMA_RANGE), GAMMA_RANGE);
93
94 img->ss.on = options->slideshow > 0;
95 img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY;
96}
97
98#if HAVE_LIBEXIF
99void exif_auto_orientate(const fileinfo_t *file)
100{
101 ExifData *ed;
102 ExifEntry *entry;
103 int byte_order, orientation = 0;
104
105 if ((ed = exif_data_new_from_file(file->path)) == NULL)
106 return;
107 byte_order = exif_data_get_byte_order(ed);
108 entry = exif_content_get_entry(ed->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION);
109 if (entry != NULL)
110 orientation = exif_get_short(entry->data, byte_order);
111 exif_data_unref(ed);
112
113 switch (orientation) {
114 case 5:
115 imlib_image_orientate(1);
116 case 2:
117 imlib_image_flip_vertical();
118 break;
119 case 3:
120 imlib_image_orientate(2);
121 break;
122 case 7:
123 imlib_image_orientate(1);
124 case 4:
125 imlib_image_flip_horizontal();
126 break;
127 case 6:
128 imlib_image_orientate(1);
129 break;
130 case 8:
131 imlib_image_orientate(3);
132 break;
133 }
134}
135#endif
136
137#if HAVE_GIFLIB
138bool img_load_gif(img_t *img, const fileinfo_t *file)
139{
140 GifFileType *gif;
141 GifRowType *rows = NULL;
142 GifRecordType rec;
143 ColorMapObject *cmap;
144 DATA32 bgpixel, *data, *ptr;
145 DATA32 *prev_frame = NULL;
146 Imlib_Image im;
147 int i, j, bg, r, g, b;
148 int x, y, w, h, sw, sh;
149 int px, py, pw, ph;
150 int intoffset[] = { 0, 4, 2, 1 };
151 int intjump[] = { 8, 8, 4, 2 };
152 int transp = -1;
153 unsigned int disposal = 0, prev_disposal = 0;
154 unsigned int delay = 0;
155 bool err = false;
156
157 if (img->multi.cap == 0) {
158 img->multi.cap = 8;
159 img->multi.frames = (img_frame_t*)
160 s_malloc(sizeof(img_frame_t) * img->multi.cap);
161 }
162 img->multi.cnt = img->multi.sel = 0;
163 img->multi.length = 0;
164
165#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
166 gif = DGifOpenFileName(file->path, NULL);
167#else
168 gif = DGifOpenFileName(file->path);
169#endif
170 if (gif == NULL) {
171 warn("could not open gif file: %s", file->name);
172 return false;
173 }
174 bg = gif->SBackGroundColor;
175 sw = gif->SWidth;
176 sh = gif->SHeight;
177 px = py = pw = ph = 0;
178
179 do {
180 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
181 err = true;
182 break;
183 }
184 if (rec == EXTENSION_RECORD_TYPE) {
185 int ext_code;
186 GifByteType *ext = NULL;
187
188 DGifGetExtension(gif, &ext_code, &ext);
189 while (ext) {
190 if (ext_code == GRAPHICS_EXT_FUNC_CODE) {
191 if (ext[1] & 1)
192 transp = (int) ext[4];
193 else
194 transp = -1;
195
196 delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
197 disposal = (unsigned int) ext[1] >> 2 & 0x7;
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 > 0 ? delay : DEF_GIF_DELAY;
284 img->multi.length += img->multi.frames[img->multi.cnt].delay;
285 img->multi.cnt++;
286 }
287 } while (rec != TERMINATE_RECORD_TYPE);
288
289#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
290 DGifCloseFile(gif, NULL);
291#else
292 DGifCloseFile(gif);
293#endif
294
295 if (err && file->warn)
296 warn("corrupted gif file: %s", file->name);
297
298 if (img->multi.cnt > 1) {
299 imlib_context_set_image(img->im);
300 imlib_free_image();
301 img->im = img->multi.frames[0].im;
302 } else if (img->multi.cnt == 1) {
303 imlib_context_set_image(img->multi.frames[0].im);
304 imlib_free_image();
305 img->multi.cnt = 0;
306 }
307
308 imlib_context_set_image(img->im);
309
310 return !err;
311}
312#endif /* HAVE_GIFLIB */
313
314bool img_load(img_t *img, const fileinfo_t *file)
315{
316 const char *fmt;
317
318 if (img == NULL || file == NULL || file->name == NULL || file->path == NULL)
319 return false;
320
321 if (access(file->path, R_OK) < 0 ||
322 (img->im = imlib_load_image(file->path)) == NULL)
323 {
324 if (file->warn)
325 warn("could not open image: %s", file->name);
326 return false;
327 }
328
329 imlib_context_set_image(img->im);
330 imlib_image_set_changes_on_disk();
331
332#if HAVE_LIBEXIF
333 exif_auto_orientate(file);
334#endif
335
336 if ((fmt = imlib_image_format()) != NULL) {
337#if HAVE_GIFLIB
338 if (STREQ(fmt, "gif"))
339 img_load_gif(img, file);
340#endif
341 }
342 img_apply_gamma(img);
343
344 img->w = imlib_image_get_width();
345 img->h = imlib_image_get_height();
346 img->checkpan = true;
347 img->dirty = true;
348
349 return true;
350}
351
352void img_close(img_t *img, bool decache)
353{
354 int i;
355
356 if (img == NULL)
357 return;
358
359 if (img->multi.cnt > 0) {
360 for (i = 0; i < img->multi.cnt; i++) {
361 imlib_context_set_image(img->multi.frames[i].im);
362 imlib_free_image();
363 }
364 img->multi.cnt = 0;
365 img->im = NULL;
366 } else if (img->im != NULL) {
367 imlib_context_set_image(img->im);
368 if (decache)
369 imlib_free_image_and_decache();
370 else
371 imlib_free_image();
372 img->im = NULL;
373 }
374
375 if (img->cmod)
376 imlib_context_set_color_modifier(NULL);
377}
378
379void img_check_pan(img_t *img, bool moved)
380{
381 win_t *win;
382 int ox, oy;
383 float w, h;
384
385 if (img == NULL || img->im == NULL || img->win == NULL)
386 return;
387
388 win = img->win;
389 w = img->w * img->zoom;
390 h = img->h * img->zoom;
391 ox = img->x;
392 oy = img->y;
393
394 if (w < win->w)
395 img->x = (win->w - w) / 2;
396 else if (img->x > 0)
397 img->x = 0;
398 else if (img->x + w < win->w)
399 img->x = win->w - w;
400 if (h < win->h)
401 img->y = (win->h - h) / 2;
402 else if (img->y > 0)
403 img->y = 0;
404 else if (img->y + h < win->h)
405 img->y = win->h - h;
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 Imlib_Image bg;
454 unsigned long c;
455
456 if (img == NULL || img->im == NULL || img->win == NULL)
457 return;
458
459 win = img->win;
460 img_fit(img);
461
462 if (img->checkpan) {
463 img_check_pan(img, false);
464 img->checkpan = false;
465 }
466
467 if (!img->dirty)
468 return;
469
470 /* calculate source and destination offsets:
471 * - part of image drawn on full window, or
472 * - full image drawn on part of window
473 */
474 if (img->x <= 0) {
475 sx = -img->x / img->zoom;
476 sw = win->w / img->zoom;
477 dx = 0;
478 dw = win->w;
479 } else {
480 sx = 0;
481 sw = img->w;
482 dx = img->x;
483 dw = img->w * img->zoom;
484 }
485 if (img->y <= 0) {
486 sy = -img->y / img->zoom;
487 sh = win->h / img->zoom;
488 dy = 0;
489 dh = win->h;
490 } else {
491 sy = 0;
492 sh = img->h;
493 dy = img->y;
494 dh = img->h * img->zoom;
495 }
496
497 win_clear(win);
498
499 imlib_context_set_image(img->im);
500 imlib_context_set_anti_alias(img->aa);
501 imlib_context_set_drawable(win->buf.pm);
502
503 if (imlib_image_has_alpha()) {
504 if ((bg = imlib_create_image(dw, dh)) == NULL)
505 die("could not allocate memory");
506 imlib_context_set_image(bg);
507 imlib_image_set_has_alpha(0);
508
509 if (img->alpha) {
510 int i, c, r;
511 DATA32 col[2] = { 0xFF666666, 0xFF999999 };
512 DATA32 * data = imlib_image_get_data();
513
514 for (r = 0; r < dh; r++) {
515 i = r * dw;
516 if (r == 0 || r == 8) {
517 for (c = 0; c < dw; c++)
518 data[i++] = col[!(c & 8) ^ !r];
519 } else {
520 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
521 }
522 }
523 imlib_image_put_back_data(data);
524 } else {
525 c = win->fullscreen ? win->fscol : win->bgcol;
526 imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
527 imlib_image_fill_rectangle(0, 0, dw, dh);
528 }
529 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
530 imlib_context_set_color_modifier(NULL);
531 imlib_render_image_on_drawable(dx, dy);
532
533 imlib_free_image();
534 if (img->gamma != 0)
535 imlib_context_set_color_modifier(img->cmod);
536 } else {
537 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
538 }
539 img->dirty = false;
540}
541
542bool img_fit_win(img_t *img, scalemode_t sm)
543{
544 float oz;
545
546 if (img == NULL || img->im == NULL || img->win == NULL)
547 return false;
548
549 oz = img->zoom;
550 img->scalemode = sm;
551
552 if (img_fit(img)) {
553 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
554 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
555 img->checkpan = true;
556 return true;
557 } else {
558 return false;
559 }
560}
561
562bool img_zoom(img_t *img, float z)
563{
564 if (img == NULL || img->im == NULL || img->win == NULL)
565 return false;
566
567 z = MAX(z, zoom_min);
568 z = MIN(z, zoom_max);
569
570 img->scalemode = SCALE_ZOOM;
571
572 if (zoomdiff(z, img->zoom) != 0) {
573 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
574 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
575 img->zoom = z;
576 img->checkpan = true;
577 img->dirty = true;
578 return true;
579 } else {
580 return false;
581 }
582}
583
584bool img_zoom_in(img_t *img)
585{
586 int i;
587 float z;
588
589 if (img == NULL || img->im == NULL)
590 return false;
591
592 for (i = 1; i < ARRLEN(zoom_levels); i++) {
593 z = zoom_levels[i] / 100.0;
594 if (zoomdiff(z, img->zoom) > 0)
595 return img_zoom(img, z);
596 }
597 return false;
598}
599
600bool img_zoom_out(img_t *img)
601{
602 int i;
603 float z;
604
605 if (img == NULL || img->im == NULL)
606 return false;
607
608 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
609 z = zoom_levels[i] / 100.0;
610 if (zoomdiff(z, img->zoom) < 0)
611 return img_zoom(img, z);
612 }
613 return false;
614}
615
616bool img_move(img_t *img, float dx, float dy)
617{
618 float ox, oy;
619
620 if (img == NULL || img->im == NULL)
621 return false;
622
623 ox = img->x;
624 oy = img->y;
625
626 img->x += dx;
627 img->y += dy;
628
629 img_check_pan(img, true);
630
631 if (ox != img->x || oy != img->y) {
632 img->dirty = true;
633 return true;
634 } else {
635 return false;
636 }
637}
638
639bool img_pan(img_t *img, direction_t dir, int d)
640{
641 /* d < 0: screen-wise
642 * d = 0: 1/5 of screen
643 * d > 0: num of pixels
644 */
645 float x, y;
646
647 if (img == NULL || img->im == NULL || img->win == NULL)
648 return false;
649
650 if (d > 0) {
651 x = y = MAX(1, (float) d * img->zoom);
652 } else {
653 x = img->win->w / (d < 0 ? 1 : 5);
654 y = img->win->h / (d < 0 ? 1 : 5);
655 }
656
657 switch (dir) {
658 case DIR_LEFT:
659 return img_move(img, x, 0.0);
660 case DIR_RIGHT:
661 return img_move(img, -x, 0.0);
662 case DIR_UP:
663 return img_move(img, 0.0, y);
664 case DIR_DOWN:
665 return img_move(img, 0.0, -y);
666 }
667 return false;
668}
669
670bool img_pan_edge(img_t *img, direction_t dir)
671{
672 int ox, oy;
673
674 if (img == NULL || img->im == NULL || img->win == NULL)
675 return false;
676
677 ox = img->x;
678 oy = img->y;
679
680 if (dir & DIR_LEFT)
681 img->x = 0;
682 if (dir & DIR_RIGHT)
683 img->x = img->win->w - img->w * img->zoom;
684 if (dir & DIR_UP)
685 img->y = 0;
686 if (dir & DIR_DOWN)
687 img->y = img->win->h - img->h * img->zoom;
688
689 img_check_pan(img, true);
690
691 if (ox != img->x || oy != img->y) {
692 img->dirty = true;
693 return true;
694 } else {
695 return false;
696 }
697}
698
699void img_rotate(img_t *img, degree_t d)
700{
701 int i, ox, oy, tmp;
702
703 if (img == NULL || img->im == NULL || img->win == NULL)
704 return;
705
706 imlib_context_set_image(img->im);
707 imlib_image_orientate(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_image_orientate(d);
713 }
714 }
715 if (d == DEGREE_90 || d == DEGREE_270) {
716 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
717 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
718
719 img->x = oy + (img->win->w - img->win->h) / 2;
720 img->y = ox + (img->win->h - img->win->w) / 2;
721
722 tmp = img->w;
723 img->w = img->h;
724 img->h = tmp;
725 img->checkpan = true;
726 }
727 img->dirty = true;
728}
729
730void img_flip(img_t *img, flipdir_t d)
731{
732 int i;
733 void (*imlib_flip_op[3])(void) = {
734 imlib_image_flip_horizontal,
735 imlib_image_flip_vertical,
736 imlib_image_flip_diagonal
737 };
738
739 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
740
741 if (img == NULL || img->im == NULL || d < 0 || d >= ARRLEN(imlib_flip_op))
742 return;
743
744 imlib_context_set_image(img->im);
745 imlib_flip_op[d]();
746
747 for (i = 0; i < img->multi.cnt; i++) {
748 if (i != img->multi.sel) {
749 imlib_context_set_image(img->multi.frames[i].im);
750 imlib_flip_op[d]();
751 }
752 }
753 img->dirty = true;
754}
755
756void img_toggle_antialias(img_t *img)
757{
758 if (img == NULL || img->im == NULL)
759 return;
760
761 img->aa = !img->aa;
762 imlib_context_set_image(img->im);
763 imlib_context_set_anti_alias(img->aa);
764 img->dirty = true;
765}
766
767bool img_change_gamma(img_t *img, int d)
768{
769 /* d < 0: decrease gamma
770 * d = 0: reset gamma
771 * d > 0: increase gamma
772 */
773 int gamma;
774
775 if (img == NULL || img->im == NULL)
776 return false;
777
778 if (d == 0)
779 gamma = 0;
780 else if (d < 0)
781 gamma = MAX(-GAMMA_RANGE, img->gamma - 1);
782 else
783 gamma = MIN(+GAMMA_RANGE, img->gamma + 1);
784
785 if (img->gamma != gamma) {
786 img->gamma = gamma;
787 img_apply_gamma(img);
788 img->dirty = true;
789 return true;
790 } else {
791 return false;
792 }
793}
794
795bool img_frame_goto(img_t *img, int n)
796{
797 if (img == NULL || img->im == NULL)
798 return false;
799 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
800 return false;
801
802 img->multi.sel = n;
803 img->im = img->multi.frames[n].im;
804
805 imlib_context_set_image(img->im);
806 img->w = imlib_image_get_width();
807 img->h = imlib_image_get_height();
808 img->checkpan = true;
809 img->dirty = true;
810
811 return true;
812}
813
814bool img_frame_navigate(img_t *img, int d)
815{
816 if (img == NULL|| img->im == NULL || img->multi.cnt == 0 || d == 0)
817 return false;
818
819 d += img->multi.sel;
820 if (d < 0)
821 d = 0;
822 else if (d >= img->multi.cnt)
823 d = img->multi.cnt - 1;
824
825 return img_frame_goto(img, d);
826}
827
828bool img_frame_animate(img_t *img)
829{
830 if (img == NULL || img->im == NULL || img->multi.cnt == 0)
831 return false;
832
833 if (img->multi.sel + 1 >= img->multi.cnt)
834 img_frame_goto(img, 0);
835 else
836 img_frame_goto(img, img->multi.sel + 1);
837 img->dirty = true;
838 return true;
839}
840