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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#if HAVE_GIFLIB
28#include <gif_lib.h>
29enum { MIN_GIF_DELAY = 25 };
30#endif
31
32#include "exif.h"
33#include "image.h"
34#include "options.h"
35#include "util.h"
36#include "config.h"
37
38float zoom_min;
39float zoom_max;
40
41static int zoomdiff(float z1, float z2)
42{
43 return (int) (z1 * 1000.0 - z2 * 1000.0);
44}
45
46static void img_apply_gamma(img_t *img)
47{
48 if (img == NULL || img->im == NULL || img->cmod == NULL)
49 return;
50
51 if (img->gamma == 0) {
52 imlib_context_set_color_modifier(NULL);
53 } else {
54 double range = img->gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
55
56 imlib_context_set_color_modifier(img->cmod);
57 imlib_reset_color_modifier();
58 imlib_modify_color_modifier_gamma(1.0 + img->gamma * (range / GAMMA_RANGE));
59 }
60}
61
62void img_init(img_t *img, win_t *win)
63{
64 zoom_min = zoom_levels[0] / 100.0;
65 zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
66
67 if (img == NULL || win == NULL)
68 return;
69
70 imlib_context_set_display(win->env.dpy);
71 imlib_context_set_visual(win->env.vis);
72 imlib_context_set_colormap(win->env.cmap);
73
74 img->im = NULL;
75 img->win = win;
76 img->scalemode = options->scalemode;
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 = ANTI_ALIAS;
83 img->alpha = ALPHA_LAYER;
84 img->multi.cap = img->multi.cnt = 0;
85 img->multi.animate = false;
86 img->multi.length = img->multi.repeat = 0;
87
88 img->cmod = imlib_create_color_modifier();
89 img->gamma = MIN(MAX(options->gamma, -GAMMA_RANGE), GAMMA_RANGE);
90
91 img->ss.on = options->slideshow > 0;
92 img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY;
93}
94
95void exif_auto_orientate(const fileinfo_t *file)
96{
97 switch (exif_orientation(file)) {
98 case 5:
99 imlib_image_orientate(1);
100 case 2:
101 imlib_image_flip_vertical();
102 break;
103 case 3:
104 imlib_image_orientate(2);
105 break;
106 case 7:
107 imlib_image_orientate(1);
108 case 4:
109 imlib_image_flip_horizontal();
110 break;
111 case 6:
112 imlib_image_orientate(1);
113 break;
114 case 8:
115 imlib_image_orientate(3);
116 break;
117 }
118}
119
120#if HAVE_GIFLIB
121bool img_load_gif(img_t *img, const fileinfo_t *file)
122{
123 GifFileType *gif;
124 GifRowType *rows = NULL;
125 GifRecordType rec;
126 ColorMapObject *cmap;
127 DATA32 bgpixel, *data, *ptr;
128 DATA32 *prev_frame = NULL;
129 Imlib_Image im;
130 int i, j, bg, r, g, b;
131 int x, y, w, h, sw, sh;
132 int px, py, pw, ph;
133 int intoffset[] = { 0, 4, 2, 1 };
134 int intjump[] = { 8, 8, 4, 2 };
135 int transp = -1;
136 unsigned int disposal = 0, prev_disposal = 0;
137 unsigned int delay = 0;
138 bool err = false;
139
140 if (img->multi.cap == 0) {
141 img->multi.cap = 8;
142 img->multi.frames = (img_frame_t*)
143 s_malloc(sizeof(img_frame_t) * img->multi.cap);
144 }
145 img->multi.cnt = img->multi.sel = 0;
146 img->multi.length = img->multi.repeat = 0;
147
148#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
149 gif = DGifOpenFileName(file->path, NULL);
150#else
151 gif = DGifOpenFileName(file->path);
152#endif
153 if (gif == NULL) {
154 warn("could not open gif file: %s", file->name);
155 return false;
156 }
157 bg = gif->SBackGroundColor;
158 sw = gif->SWidth;
159 sh = gif->SHeight;
160 px = py = pw = ph = 0;
161
162 do {
163 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
164 err = true;
165 break;
166 }
167 if (rec == EXTENSION_RECORD_TYPE) {
168 int ext_code;
169 GifByteType *ext = NULL;
170
171 DGifGetExtension(gif, &ext_code, &ext);
172 while (ext) {
173 if (ext_code == GRAPHICS_EXT_FUNC_CODE) {
174 if (ext[1] & 1)
175 transp = (int) ext[4];
176 else
177 transp = -1;
178
179 delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
180 if (delay)
181 delay = MAX(delay, MIN_GIF_DELAY);
182
183 disposal = (unsigned int) ext[1] >> 2 & 0x7;
184 } else if (ext_code == APPLICATION_EXT_FUNC_CODE) {
185 if (ext[0] == 11 && memcmp(ext+1, "NETSCAPE2.0", 11) == 0) {
186 DGifGetExtensionNext(gif, &ext);
187 if (ext && ext[0] == 3 && ext[1] == 1)
188 img->multi.repeat = ((int) ext[3] << 8 | (int) ext[2]) - 1;
189 }
190 }
191 ext = NULL;
192 DGifGetExtensionNext(gif, &ext);
193 }
194 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
195 if (DGifGetImageDesc(gif) == GIF_ERROR) {
196 err = true;
197 break;
198 }
199 x = gif->Image.Left;
200 y = gif->Image.Top;
201 w = gif->Image.Width;
202 h = gif->Image.Height;
203
204 rows = (GifRowType*) s_malloc(h * sizeof(GifRowType));
205 for (i = 0; i < h; i++)
206 rows[i] = (GifRowType) s_malloc(w * sizeof(GifPixelType));
207 if (gif->Image.Interlace) {
208 for (i = 0; i < 4; i++) {
209 for (j = intoffset[i]; j < h; j += intjump[i])
210 DGifGetLine(gif, rows[j], w);
211 }
212 } else {
213 for (i = 0; i < h; i++)
214 DGifGetLine(gif, rows[i], w);
215 }
216
217 ptr = data = (DATA32*) s_malloc(sizeof(DATA32) * sw * sh);
218 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
219 r = cmap->Colors[bg].Red;
220 g = cmap->Colors[bg].Green;
221 b = cmap->Colors[bg].Blue;
222 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
223
224 for (i = 0; i < sh; i++) {
225 for (j = 0; j < sw; j++) {
226 if (i < y || i >= y + h || j < x || j >= x + w ||
227 rows[i-y][j-x] == transp)
228 {
229 if (prev_frame != NULL && (prev_disposal != 2 ||
230 i < py || i >= py + ph || j < px || j >= px + pw))
231 {
232 *ptr = prev_frame[i * sw + j];
233 } else {
234 *ptr = bgpixel;
235 }
236 } else {
237 r = cmap->Colors[rows[i-y][j-x]].Red;
238 g = cmap->Colors[rows[i-y][j-x]].Green;
239 b = cmap->Colors[rows[i-y][j-x]].Blue;
240 *ptr = 0xff << 24 | r << 16 | g << 8 | b;
241 }
242 ptr++;
243 }
244 }
245
246 im = imlib_create_image_using_copied_data(sw, sh, data);
247
248 for (i = 0; i < h; i++)
249 free(rows[i]);
250 free(rows);
251 free(data);
252
253 if (im == NULL) {
254 err = true;
255 break;
256 }
257
258 imlib_context_set_image(im);
259 imlib_image_set_format("gif");
260 if (transp >= 0)
261 imlib_image_set_has_alpha(1);
262
263 if (disposal != 3)
264 prev_frame = imlib_image_get_data_for_reading_only();
265 prev_disposal = disposal;
266 px = x, py = y, pw = w, ph = h;
267
268 if (img->multi.cnt == img->multi.cap) {
269 img->multi.cap *= 2;
270 img->multi.frames = (img_frame_t*)
271 s_realloc(img->multi.frames,
272 img->multi.cap * sizeof(img_frame_t));
273 }
274 img->multi.frames[img->multi.cnt].im = im;
275 img->multi.frames[img->multi.cnt].delay = delay ? delay : GIF_DELAY;
276 img->multi.length += img->multi.frames[img->multi.cnt].delay;
277 img->multi.cnt++;
278 }
279 } while (rec != TERMINATE_RECORD_TYPE);
280
281 DGifCloseFile(gif);
282
283 if (err && !file->loaded)
284 warn("corrupted gif file: %s", file->name);
285
286 if (img->multi.cnt > 1) {
287 imlib_context_set_image(img->im);
288 imlib_free_image();
289 img->im = img->multi.frames[0].im;
290 img->multi.animate = GIF_AUTOPLAY;
291 } else if (img->multi.cnt == 1) {
292 imlib_context_set_image(img->multi.frames[0].im);
293 imlib_free_image();
294 img->multi.cnt = 0;
295 img->multi.animate = false;
296 }
297
298 imlib_context_set_image(img->im);
299
300 return !err;
301}
302#endif /* HAVE_GIFLIB */
303
304bool img_load(img_t *img, const fileinfo_t *file)
305{
306 const char *fmt;
307
308 if (img == NULL || file == NULL || file->name == NULL || file->path == NULL)
309 return false;
310
311 if (access(file->path, R_OK) < 0 ||
312 (img->im = imlib_load_image(file->path)) == NULL)
313 {
314 warn("could not open image: %s", file->name);
315 return false;
316 }
317
318 imlib_context_set_image(img->im);
319 imlib_image_set_changes_on_disk();
320
321 if ((fmt = imlib_image_format()) == NULL) {
322 warn("could not open image: %s", file->name);
323 return false;
324 }
325 if (STREQ(fmt, "jpeg"))
326 exif_auto_orientate(file);
327#if HAVE_GIFLIB
328 if (STREQ(fmt, "gif"))
329 img_load_gif(img, file);
330#endif
331
332 img_apply_gamma(img);
333
334 img->w = imlib_image_get_width();
335 img->h = imlib_image_get_height();
336 img->checkpan = true;
337 img->dirty = true;
338
339 return true;
340}
341
342void img_close(img_t *img, bool decache)
343{
344 int i;
345
346 if (img == NULL)
347 return;
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 if (img->cmod)
366 imlib_context_set_color_modifier(NULL);
367}
368
369void img_check_pan(img_t *img, bool moved)
370{
371 win_t *win;
372 int ox, oy;
373 float w, h;
374
375 if (img == NULL || img->im == NULL || img->win == NULL)
376 return;
377
378 win = img->win;
379 w = img->w * img->zoom;
380 h = img->h * img->zoom;
381 ox = img->x;
382 oy = img->y;
383
384 if (w < win->w)
385 img->x = (win->w - w) / 2;
386 else if (img->x > 0)
387 img->x = 0;
388 else if (img->x + w < win->w)
389 img->x = win->w - w;
390 if (h < win->h)
391 img->y = (win->h - h) / 2;
392 else if (img->y > 0)
393 img->y = 0;
394 else if (img->y + h < win->h)
395 img->y = win->h - h;
396
397 if (!moved && (ox != img->x || oy != img->y))
398 img->dirty = true;
399}
400
401bool img_fit(img_t *img)
402{
403 float z, zmax, zw, zh;
404
405 if (img == NULL || img->im == NULL || img->win == NULL)
406 return false;
407 if (img->scalemode == SCALE_ZOOM)
408 return false;
409
410 zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
411 zw = (float) img->win->w / (float) img->w;
412 zh = (float) img->win->h / (float) img->h;
413
414 switch (img->scalemode) {
415 case SCALE_WIDTH:
416 z = zw;
417 break;
418 case SCALE_HEIGHT:
419 z = zh;
420 break;
421 default:
422 z = MIN(zw, zh);
423 break;
424 }
425
426 z = MAX(z, zoom_min);
427 z = MIN(z, zmax);
428
429 if (zoomdiff(z, img->zoom) != 0) {
430 img->zoom = z;
431 img->dirty = true;
432 return true;
433 } else {
434 return false;
435 }
436}
437
438void img_render(img_t *img)
439{
440 win_t *win;
441 int sx, sy, sw, sh;
442 int dx, dy, dw, dh;
443 Imlib_Image bg;
444 unsigned long c;
445
446 if (img == NULL || img->im == NULL || img->win == NULL)
447 return;
448
449 win = img->win;
450 img_fit(img);
451
452 if (img->checkpan) {
453 img_check_pan(img, false);
454 img->checkpan = false;
455 }
456
457 if (!img->dirty)
458 return;
459
460 /* calculate source and destination offsets:
461 * - part of image drawn on full window, or
462 * - full image drawn on part of window
463 */
464 if (img->x <= 0) {
465 sx = -img->x / img->zoom;
466 sw = win->w / img->zoom;
467 dx = 0;
468 dw = win->w;
469 } else {
470 sx = 0;
471 sw = img->w;
472 dx = img->x;
473 dw = img->w * img->zoom;
474 }
475 if (img->y <= 0) {
476 sy = -img->y / img->zoom;
477 sh = win->h / img->zoom;
478 dy = 0;
479 dh = win->h;
480 } else {
481 sy = 0;
482 sh = img->h;
483 dy = img->y;
484 dh = img->h * img->zoom;
485 }
486
487 win_clear(win);
488
489 imlib_context_set_image(img->im);
490 imlib_context_set_anti_alias(img->aa);
491 imlib_context_set_drawable(win->pm);
492
493 if (imlib_image_has_alpha()) {
494 if ((bg = imlib_create_image(dw, dh)) == NULL)
495 die("could not allocate memory");
496 imlib_context_set_image(bg);
497 imlib_image_set_has_alpha(0);
498
499 if (img->alpha) {
500 int i, c, r;
501 DATA32 col[2] = { 0xFF666666, 0xFF999999 };
502 DATA32 * data = imlib_image_get_data();
503
504 for (r = 0; r < dh; r++) {
505 i = r * dw;
506 if (r == 0 || r == 8) {
507 for (c = 0; c < dw; c++)
508 data[i++] = col[!(c & 8) ^ !r];
509 } else {
510 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
511 }
512 }
513 imlib_image_put_back_data(data);
514 } else {
515 c = win->fullscreen ? win->fscol : win->bgcol;
516 imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
517 imlib_image_fill_rectangle(0, 0, dw, dh);
518 }
519 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
520 imlib_context_set_color_modifier(NULL);
521 imlib_render_image_on_drawable(dx, dy);
522
523 imlib_free_image();
524 if (img->gamma != 0)
525 imlib_context_set_color_modifier(img->cmod);
526 } else {
527 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
528 }
529 img->dirty = false;
530}
531
532bool img_fit_win(img_t *img, scalemode_t sm)
533{
534 float oz;
535
536 if (img == NULL || img->im == NULL || img->win == NULL)
537 return false;
538
539 oz = img->zoom;
540 img->scalemode = sm;
541
542 if (img_fit(img)) {
543 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
544 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
545 img->checkpan = true;
546 return true;
547 } else {
548 return false;
549 }
550}
551
552bool img_zoom(img_t *img, float z)
553{
554 if (img == NULL || img->im == NULL || img->win == NULL)
555 return false;
556
557 z = MAX(z, zoom_min);
558 z = MIN(z, zoom_max);
559
560 img->scalemode = SCALE_ZOOM;
561
562 if (zoomdiff(z, img->zoom) != 0) {
563 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
564 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
565 img->zoom = z;
566 img->checkpan = true;
567 img->dirty = true;
568 return true;
569 } else {
570 return false;
571 }
572}
573
574bool img_zoom_in(img_t *img)
575{
576 int i;
577 float z;
578
579 if (img == NULL || img->im == NULL)
580 return false;
581
582 for (i = 1; i < ARRLEN(zoom_levels); i++) {
583 z = zoom_levels[i] / 100.0;
584 if (zoomdiff(z, img->zoom) > 0)
585 return img_zoom(img, z);
586 }
587 return false;
588}
589
590bool img_zoom_out(img_t *img)
591{
592 int i;
593 float z;
594
595 if (img == NULL || img->im == NULL)
596 return false;
597
598 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
599 z = zoom_levels[i] / 100.0;
600 if (zoomdiff(z, img->zoom) < 0)
601 return img_zoom(img, z);
602 }
603 return false;
604}
605
606bool img_move(img_t *img, float dx, float dy)
607{
608 float ox, oy;
609
610 if (img == NULL || img->im == NULL)
611 return false;
612
613 ox = img->x;
614 oy = img->y;
615
616 img->x += dx;
617 img->y += dy;
618
619 img_check_pan(img, true);
620
621 if (ox != img->x || oy != img->y) {
622 img->dirty = true;
623 return true;
624 } else {
625 return false;
626 }
627}
628
629bool img_pan(img_t *img, direction_t dir, int d)
630{
631 /* d < 0: screen-wise
632 * d = 0: 1/5 of screen
633 * d > 0: num of pixels
634 */
635 float x, y;
636
637 if (img == NULL || img->im == NULL || img->win == NULL)
638 return false;
639
640 if (d > 0) {
641 x = y = MAX(1, (float) d * img->zoom);
642 } else {
643 x = img->win->w / (d < 0 ? 1 : 5);
644 y = img->win->h / (d < 0 ? 1 : 5);
645 }
646
647 switch (dir) {
648 case DIR_LEFT:
649 return img_move(img, x, 0.0);
650 case DIR_RIGHT:
651 return img_move(img, -x, 0.0);
652 case DIR_UP:
653 return img_move(img, 0.0, y);
654 case DIR_DOWN:
655 return img_move(img, 0.0, -y);
656 }
657 return false;
658}
659
660bool img_pan_edge(img_t *img, direction_t dir)
661{
662 int ox, oy;
663
664 if (img == NULL || img->im == NULL || img->win == NULL)
665 return false;
666
667 ox = img->x;
668 oy = img->y;
669
670 switch (dir) {
671 case DIR_LEFT:
672 img->x = 0;
673 break;
674 case DIR_RIGHT:
675 img->x = img->win->w - img->w * img->zoom;
676 break;
677 case DIR_UP:
678 img->y = 0;
679 break;
680 case DIR_DOWN:
681 img->y = img->win->h - img->h * img->zoom;
682 break;
683 }
684
685 img_check_pan(img, true);
686
687 if (ox != img->x || oy != img->y) {
688 img->dirty = true;
689 return true;
690 } else {
691 return false;
692 }
693}
694
695void img_rotate(img_t *img, degree_t d)
696{
697 int i, ox, oy, tmp;
698
699 if (img == NULL || img->im == NULL || img->win == NULL)
700 return;
701
702 imlib_context_set_image(img->im);
703 imlib_image_orientate(d);
704
705 for (i = 0; i < img->multi.cnt; i++) {
706 if (i != img->multi.sel) {
707 imlib_context_set_image(img->multi.frames[i].im);
708 imlib_image_orientate(d);
709 }
710 }
711 if (d == DEGREE_90 || d == DEGREE_270) {
712 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
713 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
714
715 img->x = oy + (img->win->w - img->win->h) / 2;
716 img->y = ox + (img->win->h - img->win->w) / 2;
717
718 tmp = img->w;
719 img->w = img->h;
720 img->h = tmp;
721 img->checkpan = true;
722 }
723 img->dirty = true;
724}
725
726void img_flip(img_t *img, flipdir_t d)
727{
728 int i;
729 void (*imlib_flip_op[3])(void) = {
730 imlib_image_flip_horizontal,
731 imlib_image_flip_vertical,
732 imlib_image_flip_diagonal
733 };
734
735 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
736
737 if (img == NULL || img->im == NULL || d < 0 || d >= ARRLEN(imlib_flip_op))
738 return;
739
740 imlib_context_set_image(img->im);
741 imlib_flip_op[d]();
742
743 for (i = 0; i < img->multi.cnt; i++) {
744 if (i != img->multi.sel) {
745 imlib_context_set_image(img->multi.frames[i].im);
746 imlib_flip_op[d]();
747 }
748 }
749 img->dirty = true;
750}
751
752void img_toggle_antialias(img_t *img)
753{
754 if (img == NULL || img->im == NULL)
755 return;
756
757 img->aa = !img->aa;
758 imlib_context_set_image(img->im);
759 imlib_context_set_anti_alias(img->aa);
760 img->dirty = true;
761}
762
763bool img_change_gamma(img_t *img, int d)
764{
765 /* d < 0: decrease gamma
766 * d = 0: reset gamma
767 * d > 0: increase gamma
768 */
769 int gamma;
770
771 if (img == NULL || img->im == NULL)
772 return false;
773
774 if (d == 0)
775 gamma = 0;
776 else if (d < 0)
777 gamma = MAX(-GAMMA_RANGE, img->gamma - 1);
778 else
779 gamma = MIN(+GAMMA_RANGE, img->gamma + 1);
780
781 if (img->gamma != gamma) {
782 img->gamma = gamma;
783 img_apply_gamma(img);
784 img->dirty = true;
785 return true;
786 } else {
787 return false;
788 }
789}
790
791bool img_frame_goto(img_t *img, int n)
792{
793 if (img == NULL || img->im == NULL)
794 return false;
795 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
796 return false;
797
798 img->multi.sel = n;
799 img->im = img->multi.frames[n].im;
800
801 imlib_context_set_image(img->im);
802 img->w = imlib_image_get_width();
803 img->h = imlib_image_get_height();
804 img->checkpan = true;
805 img->dirty = true;
806
807 return true;
808}
809
810bool img_frame_navigate(img_t *img, int d)
811{
812 if (img == NULL|| img->im == NULL || img->multi.cnt == 0 || d == 0)
813 return false;
814
815 d += img->multi.sel;
816 if (d < 0)
817 d = 0;
818 else if (d >= img->multi.cnt)
819 d = img->multi.cnt - 1;
820
821 return img_frame_goto(img, d);
822}
823
824bool img_frame_animate(img_t *img, bool restart)
825{
826 if (img == NULL || img->im == NULL || img->multi.cnt == 0)
827 return false;
828
829 if (img->multi.sel + 1 >= img->multi.cnt) {
830 if (restart || GIF_LOOP == 1) {
831 img_frame_goto(img, 0);
832 } else if (GIF_LOOP == -1 && img->multi.repeat != 0) {
833 if (img->multi.repeat > 0)
834 img->multi.repeat--;
835 img_frame_goto(img, 0);
836 } else {
837 img->multi.animate = false;
838 return false;
839 }
840 } else if (!restart) {
841 img_frame_goto(img, img->multi.sel + 1);
842 }
843 img->multi.animate = true;
844 img->dirty = true;
845
846 return true;
847}