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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#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->loaded)
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 warn("could not open image: %s", file->name);
325 return false;
326 }
327
328 imlib_context_set_image(img->im);
329 imlib_image_set_changes_on_disk();
330
331#if HAVE_LIBEXIF
332 exif_auto_orientate(file);
333#endif
334
335 if ((fmt = imlib_image_format()) != NULL) {
336#if HAVE_GIFLIB
337 if (STREQ(fmt, "gif"))
338 img_load_gif(img, file);
339#endif
340 }
341 img_apply_gamma(img);
342
343 img->w = imlib_image_get_width();
344 img->h = imlib_image_get_height();
345 img->checkpan = true;
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 float w, h;
383
384 if (img == NULL || img->im == NULL || img->win == NULL)
385 return;
386
387 win = img->win;
388 w = img->w * img->zoom;
389 h = img->h * img->zoom;
390 ox = img->x;
391 oy = img->y;
392
393 if (w < win->w)
394 img->x = (win->w - w) / 2;
395 else if (img->x > 0)
396 img->x = 0;
397 else if (img->x + w < win->w)
398 img->x = win->w - w;
399 if (h < win->h)
400 img->y = (win->h - h) / 2;
401 else if (img->y > 0)
402 img->y = 0;
403 else if (img->y + h < win->h)
404 img->y = win->h - h;
405
406 if (!moved && (ox != img->x || oy != img->y))
407 img->dirty = true;
408}
409
410bool img_fit(img_t *img)
411{
412 float z, zmax, zw, zh;
413
414 if (img == NULL || img->im == NULL || img->win == NULL)
415 return false;
416 if (img->scalemode == SCALE_ZOOM)
417 return false;
418
419 zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
420 zw = (float) img->win->w / (float) img->w;
421 zh = (float) img->win->h / (float) img->h;
422
423 switch (img->scalemode) {
424 case SCALE_WIDTH:
425 z = zw;
426 break;
427 case SCALE_HEIGHT:
428 z = zh;
429 break;
430 default:
431 z = MIN(zw, zh);
432 break;
433 }
434
435 z = MAX(z, zoom_min);
436 z = MIN(z, zmax);
437
438 if (zoomdiff(z, img->zoom) != 0) {
439 img->zoom = z;
440 img->dirty = true;
441 return true;
442 } else {
443 return false;
444 }
445}
446
447void img_render(img_t *img)
448{
449 win_t *win;
450 int sx, sy, sw, sh;
451 int dx, dy, dw, dh;
452 Imlib_Image bg;
453 unsigned long c;
454
455 if (img == NULL || img->im == NULL || img->win == NULL)
456 return;
457
458 win = img->win;
459 img_fit(img);
460
461 if (img->checkpan) {
462 img_check_pan(img, false);
463 img->checkpan = false;
464 }
465
466 if (!img->dirty)
467 return;
468
469 /* calculate source and destination offsets:
470 * - part of image drawn on full window, or
471 * - full image drawn on part of window
472 */
473 if (img->x <= 0) {
474 sx = -img->x / img->zoom;
475 sw = win->w / img->zoom;
476 dx = 0;
477 dw = win->w;
478 } else {
479 sx = 0;
480 sw = img->w;
481 dx = img->x;
482 dw = img->w * img->zoom;
483 }
484 if (img->y <= 0) {
485 sy = -img->y / img->zoom;
486 sh = win->h / img->zoom;
487 dy = 0;
488 dh = win->h;
489 } else {
490 sy = 0;
491 sh = img->h;
492 dy = img->y;
493 dh = img->h * img->zoom;
494 }
495
496 win_clear(win);
497
498 imlib_context_set_image(img->im);
499 imlib_context_set_anti_alias(img->aa);
500 imlib_context_set_drawable(win->buf.pm);
501
502 if (imlib_image_has_alpha()) {
503 if ((bg = imlib_create_image(dw, dh)) == NULL)
504 die("could not allocate memory");
505 imlib_context_set_image(bg);
506 imlib_image_set_has_alpha(0);
507
508 if (img->alpha) {
509 int i, c, r;
510 DATA32 col[2] = { 0xFF666666, 0xFF999999 };
511 DATA32 * data = imlib_image_get_data();
512
513 for (r = 0; r < dh; r++) {
514 i = r * dw;
515 if (r == 0 || r == 8) {
516 for (c = 0; c < dw; c++)
517 data[i++] = col[!(c & 8) ^ !r];
518 } else {
519 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
520 }
521 }
522 imlib_image_put_back_data(data);
523 } else {
524 c = win->fullscreen ? win->fscol : win->bgcol;
525 imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
526 imlib_image_fill_rectangle(0, 0, dw, dh);
527 }
528 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
529 imlib_context_set_color_modifier(NULL);
530 imlib_render_image_on_drawable(dx, dy);
531
532 imlib_free_image();
533 if (img->gamma != 0)
534 imlib_context_set_color_modifier(img->cmod);
535 } else {
536 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
537 }
538 img->dirty = false;
539}
540
541bool img_fit_win(img_t *img, scalemode_t sm)
542{
543 float oz;
544
545 if (img == NULL || img->im == NULL || img->win == NULL)
546 return false;
547
548 oz = img->zoom;
549 img->scalemode = sm;
550
551 if (img_fit(img)) {
552 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
553 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
554 img->checkpan = true;
555 return true;
556 } else {
557 return false;
558 }
559}
560
561bool img_zoom(img_t *img, float z)
562{
563 if (img == NULL || img->im == NULL || img->win == NULL)
564 return false;
565
566 z = MAX(z, zoom_min);
567 z = MIN(z, zoom_max);
568
569 img->scalemode = SCALE_ZOOM;
570
571 if (zoomdiff(z, img->zoom) != 0) {
572 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
573 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
574 img->zoom = z;
575 img->checkpan = true;
576 img->dirty = true;
577 return true;
578 } else {
579 return false;
580 }
581}
582
583bool img_zoom_in(img_t *img)
584{
585 int i;
586 float z;
587
588 if (img == NULL || img->im == NULL)
589 return false;
590
591 for (i = 1; i < ARRLEN(zoom_levels); i++) {
592 z = zoom_levels[i] / 100.0;
593 if (zoomdiff(z, img->zoom) > 0)
594 return img_zoom(img, z);
595 }
596 return false;
597}
598
599bool img_zoom_out(img_t *img)
600{
601 int i;
602 float z;
603
604 if (img == NULL || img->im == NULL)
605 return false;
606
607 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
608 z = zoom_levels[i] / 100.0;
609 if (zoomdiff(z, img->zoom) < 0)
610 return img_zoom(img, z);
611 }
612 return false;
613}
614
615bool img_move(img_t *img, float dx, float dy)
616{
617 float ox, oy;
618
619 if (img == NULL || img->im == NULL)
620 return false;
621
622 ox = img->x;
623 oy = img->y;
624
625 img->x += dx;
626 img->y += dy;
627
628 img_check_pan(img, true);
629
630 if (ox != img->x || oy != img->y) {
631 img->dirty = true;
632 return true;
633 } else {
634 return false;
635 }
636}
637
638bool img_pan(img_t *img, direction_t dir, int d)
639{
640 /* d < 0: screen-wise
641 * d = 0: 1/5 of screen
642 * d > 0: num of pixels
643 */
644 float x, y;
645
646 if (img == NULL || img->im == NULL || img->win == NULL)
647 return false;
648
649 if (d > 0) {
650 x = y = MAX(1, (float) d * img->zoom);
651 } else {
652 x = img->win->w / (d < 0 ? 1 : 5);
653 y = img->win->h / (d < 0 ? 1 : 5);
654 }
655
656 switch (dir) {
657 case DIR_LEFT:
658 return img_move(img, x, 0.0);
659 case DIR_RIGHT:
660 return img_move(img, -x, 0.0);
661 case DIR_UP:
662 return img_move(img, 0.0, y);
663 case DIR_DOWN:
664 return img_move(img, 0.0, -y);
665 }
666 return false;
667}
668
669bool img_pan_edge(img_t *img, direction_t dir)
670{
671 int ox, oy;
672
673 if (img == NULL || img->im == NULL || img->win == NULL)
674 return false;
675
676 ox = img->x;
677 oy = img->y;
678
679 if (dir & DIR_LEFT)
680 img->x = 0;
681 if (dir & DIR_RIGHT)
682 img->x = img->win->w - img->w * img->zoom;
683 if (dir & DIR_UP)
684 img->y = 0;
685 if (dir & DIR_DOWN)
686 img->y = img->win->h - img->h * img->zoom;
687
688 img_check_pan(img, true);
689
690 if (ox != img->x || oy != img->y) {
691 img->dirty = true;
692 return true;
693 } else {
694 return false;
695 }
696}
697
698void img_rotate(img_t *img, degree_t d)
699{
700 int i, ox, oy, tmp;
701
702 if (img == NULL || img->im == NULL || img->win == NULL)
703 return;
704
705 imlib_context_set_image(img->im);
706 imlib_image_orientate(d);
707
708 for (i = 0; i < img->multi.cnt; i++) {
709 if (i != img->multi.sel) {
710 imlib_context_set_image(img->multi.frames[i].im);
711 imlib_image_orientate(d);
712 }
713 }
714 if (d == DEGREE_90 || d == DEGREE_270) {
715 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
716 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
717
718 img->x = oy + (img->win->w - img->win->h) / 2;
719 img->y = ox + (img->win->h - img->win->w) / 2;
720
721 tmp = img->w;
722 img->w = img->h;
723 img->h = tmp;
724 img->checkpan = true;
725 }
726 img->dirty = true;
727}
728
729void img_flip(img_t *img, flipdir_t d)
730{
731 int i;
732 void (*imlib_flip_op[3])(void) = {
733 imlib_image_flip_horizontal,
734 imlib_image_flip_vertical,
735 imlib_image_flip_diagonal
736 };
737
738 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
739
740 if (img == NULL || img->im == NULL || d < 0 || d >= ARRLEN(imlib_flip_op))
741 return;
742
743 imlib_context_set_image(img->im);
744 imlib_flip_op[d]();
745
746 for (i = 0; i < img->multi.cnt; i++) {
747 if (i != img->multi.sel) {
748 imlib_context_set_image(img->multi.frames[i].im);
749 imlib_flip_op[d]();
750 }
751 }
752 img->dirty = true;
753}
754
755void img_toggle_antialias(img_t *img)
756{
757 if (img == NULL || img->im == NULL)
758 return;
759
760 img->aa = !img->aa;
761 imlib_context_set_image(img->im);
762 imlib_context_set_anti_alias(img->aa);
763 img->dirty = true;
764}
765
766bool img_change_gamma(img_t *img, int d)
767{
768 /* d < 0: decrease gamma
769 * d = 0: reset gamma
770 * d > 0: increase gamma
771 */
772 int gamma;
773
774 if (img == NULL || img->im == NULL)
775 return false;
776
777 if (d == 0)
778 gamma = 0;
779 else if (d < 0)
780 gamma = MAX(-GAMMA_RANGE, img->gamma - 1);
781 else
782 gamma = MIN(+GAMMA_RANGE, img->gamma + 1);
783
784 if (img->gamma != gamma) {
785 img->gamma = gamma;
786 img_apply_gamma(img);
787 img->dirty = true;
788 return true;
789 } else {
790 return false;
791 }
792}
793
794bool img_frame_goto(img_t *img, int n)
795{
796 if (img == NULL || img->im == NULL)
797 return false;
798 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
799 return false;
800
801 img->multi.sel = n;
802 img->im = img->multi.frames[n].im;
803
804 imlib_context_set_image(img->im);
805 img->w = imlib_image_get_width();
806 img->h = imlib_image_get_height();
807 img->checkpan = true;
808 img->dirty = true;
809
810 return true;
811}
812
813bool img_frame_navigate(img_t *img, int d)
814{
815 if (img == NULL|| img->im == NULL || img->multi.cnt == 0 || d == 0)
816 return false;
817
818 d += img->multi.sel;
819 if (d < 0)
820 d = 0;
821 else if (d >= img->multi.cnt)
822 d = img->multi.cnt - 1;
823
824 return img_frame_goto(img, d);
825}
826
827bool img_frame_animate(img_t *img)
828{
829 if (img == NULL || img->im == NULL || img->multi.cnt == 0)
830 return false;
831
832 if (img->multi.sel + 1 >= img->multi.cnt)
833 img_frame_goto(img, 0);
834 else
835 img_frame_goto(img, img->multi.sel + 1);
836 img->dirty = true;
837 return true;
838}
839