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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#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
282 DGifCloseFile(gif, NULL);
283#else
284 DGifCloseFile(gif);
285#endif
286
287 if (err && !file->loaded)
288 warn("corrupted gif file: %s", file->name);
289
290 if (img->multi.cnt > 1) {
291 imlib_context_set_image(img->im);
292 imlib_free_image();
293 img->im = img->multi.frames[0].im;
294 img->multi.animate = GIF_AUTOPLAY;
295 } else if (img->multi.cnt == 1) {
296 imlib_context_set_image(img->multi.frames[0].im);
297 imlib_free_image();
298 img->multi.cnt = 0;
299 img->multi.animate = false;
300 }
301
302 imlib_context_set_image(img->im);
303
304 return !err;
305}
306#endif /* HAVE_GIFLIB */
307
308bool img_load(img_t *img, const fileinfo_t *file)
309{
310 const char *fmt;
311
312 if (img == NULL || file == NULL || file->name == NULL || file->path == NULL)
313 return false;
314
315 if (access(file->path, R_OK) < 0 ||
316 (img->im = imlib_load_image(file->path)) == NULL)
317 {
318 warn("could not open image: %s", file->name);
319 return false;
320 }
321
322 imlib_context_set_image(img->im);
323 imlib_image_set_changes_on_disk();
324
325 if ((fmt = imlib_image_format()) == NULL) {
326 warn("could not open image: %s", file->name);
327 return false;
328 }
329 if (STREQ(fmt, "jpeg"))
330 exif_auto_orientate(file);
331#if HAVE_GIFLIB
332 if (STREQ(fmt, "gif"))
333 img_load_gif(img, file);
334#endif
335
336 img_apply_gamma(img);
337
338 img->w = imlib_image_get_width();
339 img->h = imlib_image_get_height();
340 img->checkpan = true;
341 img->dirty = true;
342
343 return true;
344}
345
346void img_close(img_t *img, bool decache)
347{
348 int i;
349
350 if (img == NULL)
351 return;
352
353 if (img->multi.cnt > 0) {
354 for (i = 0; i < img->multi.cnt; i++) {
355 imlib_context_set_image(img->multi.frames[i].im);
356 imlib_free_image();
357 }
358 img->multi.cnt = 0;
359 img->im = NULL;
360 } else if (img->im != NULL) {
361 imlib_context_set_image(img->im);
362 if (decache)
363 imlib_free_image_and_decache();
364 else
365 imlib_free_image();
366 img->im = NULL;
367 }
368
369 if (img->cmod)
370 imlib_context_set_color_modifier(NULL);
371}
372
373void img_check_pan(img_t *img, bool moved)
374{
375 win_t *win;
376 int ox, oy;
377 float w, h;
378
379 if (img == NULL || img->im == NULL || img->win == NULL)
380 return;
381
382 win = img->win;
383 w = img->w * img->zoom;
384 h = img->h * img->zoom;
385 ox = img->x;
386 oy = img->y;
387
388 if (w < win->w)
389 img->x = (win->w - w) / 2;
390 else if (img->x > 0)
391 img->x = 0;
392 else if (img->x + w < win->w)
393 img->x = win->w - w;
394 if (h < win->h)
395 img->y = (win->h - h) / 2;
396 else if (img->y > 0)
397 img->y = 0;
398 else if (img->y + h < win->h)
399 img->y = win->h - h;
400
401 if (!moved && (ox != img->x || oy != img->y))
402 img->dirty = true;
403}
404
405bool img_fit(img_t *img)
406{
407 float z, zmax, zw, zh;
408
409 if (img == NULL || img->im == NULL || img->win == NULL)
410 return false;
411 if (img->scalemode == SCALE_ZOOM)
412 return false;
413
414 zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
415 zw = (float) img->win->w / (float) img->w;
416 zh = (float) img->win->h / (float) img->h;
417
418 switch (img->scalemode) {
419 case SCALE_WIDTH:
420 z = zw;
421 break;
422 case SCALE_HEIGHT:
423 z = zh;
424 break;
425 default:
426 z = MIN(zw, zh);
427 break;
428 }
429
430 z = MAX(z, zoom_min);
431 z = MIN(z, zmax);
432
433 if (zoomdiff(z, img->zoom) != 0) {
434 img->zoom = z;
435 img->dirty = true;
436 return true;
437 } else {
438 return false;
439 }
440}
441
442void img_render(img_t *img)
443{
444 win_t *win;
445 int sx, sy, sw, sh;
446 int dx, dy, dw, dh;
447 Imlib_Image bg;
448 unsigned long c;
449
450 if (img == NULL || img->im == NULL || img->win == NULL)
451 return;
452
453 win = img->win;
454 img_fit(img);
455
456 if (img->checkpan) {
457 img_check_pan(img, false);
458 img->checkpan = false;
459 }
460
461 if (!img->dirty)
462 return;
463
464 /* calculate source and destination offsets:
465 * - part of image drawn on full window, or
466 * - full image drawn on part of window
467 */
468 if (img->x <= 0) {
469 sx = -img->x / img->zoom;
470 sw = win->w / img->zoom;
471 dx = 0;
472 dw = win->w;
473 } else {
474 sx = 0;
475 sw = img->w;
476 dx = img->x;
477 dw = img->w * img->zoom;
478 }
479 if (img->y <= 0) {
480 sy = -img->y / img->zoom;
481 sh = win->h / img->zoom;
482 dy = 0;
483 dh = win->h;
484 } else {
485 sy = 0;
486 sh = img->h;
487 dy = img->y;
488 dh = img->h * img->zoom;
489 }
490
491 win_clear(win);
492
493 imlib_context_set_image(img->im);
494 imlib_context_set_anti_alias(img->aa);
495 imlib_context_set_drawable(win->pm);
496
497 if (imlib_image_has_alpha()) {
498 if ((bg = imlib_create_image(dw, dh)) == NULL)
499 die("could not allocate memory");
500 imlib_context_set_image(bg);
501 imlib_image_set_has_alpha(0);
502
503 if (img->alpha) {
504 int i, c, r;
505 DATA32 col[2] = { 0xFF666666, 0xFF999999 };
506 DATA32 * data = imlib_image_get_data();
507
508 for (r = 0; r < dh; r++) {
509 i = r * dw;
510 if (r == 0 || r == 8) {
511 for (c = 0; c < dw; c++)
512 data[i++] = col[!(c & 8) ^ !r];
513 } else {
514 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
515 }
516 }
517 imlib_image_put_back_data(data);
518 } else {
519 c = win->fullscreen ? win->fscol : win->bgcol;
520 imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
521 imlib_image_fill_rectangle(0, 0, dw, dh);
522 }
523 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
524 imlib_context_set_color_modifier(NULL);
525 imlib_render_image_on_drawable(dx, dy);
526
527 imlib_free_image();
528 if (img->gamma != 0)
529 imlib_context_set_color_modifier(img->cmod);
530 } else {
531 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
532 }
533 img->dirty = false;
534}
535
536bool img_fit_win(img_t *img, scalemode_t sm)
537{
538 float oz;
539
540 if (img == NULL || img->im == NULL || img->win == NULL)
541 return false;
542
543 oz = img->zoom;
544 img->scalemode = sm;
545
546 if (img_fit(img)) {
547 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
548 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
549 img->checkpan = true;
550 return true;
551 } else {
552 return false;
553 }
554}
555
556bool img_zoom(img_t *img, float z)
557{
558 if (img == NULL || img->im == NULL || img->win == NULL)
559 return false;
560
561 z = MAX(z, zoom_min);
562 z = MIN(z, zoom_max);
563
564 img->scalemode = SCALE_ZOOM;
565
566 if (zoomdiff(z, img->zoom) != 0) {
567 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
568 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
569 img->zoom = z;
570 img->checkpan = true;
571 img->dirty = true;
572 return true;
573 } else {
574 return false;
575 }
576}
577
578bool img_zoom_in(img_t *img)
579{
580 int i;
581 float z;
582
583 if (img == NULL || img->im == NULL)
584 return false;
585
586 for (i = 1; i < ARRLEN(zoom_levels); i++) {
587 z = zoom_levels[i] / 100.0;
588 if (zoomdiff(z, img->zoom) > 0)
589 return img_zoom(img, z);
590 }
591 return false;
592}
593
594bool img_zoom_out(img_t *img)
595{
596 int i;
597 float z;
598
599 if (img == NULL || img->im == NULL)
600 return false;
601
602 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
603 z = zoom_levels[i] / 100.0;
604 if (zoomdiff(z, img->zoom) < 0)
605 return img_zoom(img, z);
606 }
607 return false;
608}
609
610bool img_move(img_t *img, float dx, float dy)
611{
612 float ox, oy;
613
614 if (img == NULL || img->im == NULL)
615 return false;
616
617 ox = img->x;
618 oy = img->y;
619
620 img->x += dx;
621 img->y += dy;
622
623 img_check_pan(img, true);
624
625 if (ox != img->x || oy != img->y) {
626 img->dirty = true;
627 return true;
628 } else {
629 return false;
630 }
631}
632
633bool img_pan(img_t *img, direction_t dir, int d)
634{
635 /* d < 0: screen-wise
636 * d = 0: 1/5 of screen
637 * d > 0: num of pixels
638 */
639 float x, y;
640
641 if (img == NULL || img->im == NULL || img->win == NULL)
642 return false;
643
644 if (d > 0) {
645 x = y = MAX(1, (float) d * img->zoom);
646 } else {
647 x = img->win->w / (d < 0 ? 1 : 5);
648 y = img->win->h / (d < 0 ? 1 : 5);
649 }
650
651 switch (dir) {
652 case DIR_LEFT:
653 return img_move(img, x, 0.0);
654 case DIR_RIGHT:
655 return img_move(img, -x, 0.0);
656 case DIR_UP:
657 return img_move(img, 0.0, y);
658 case DIR_DOWN:
659 return img_move(img, 0.0, -y);
660 }
661 return false;
662}
663
664bool img_pan_edge(img_t *img, direction_t dir)
665{
666 int ox, oy;
667
668 if (img == NULL || img->im == NULL || img->win == NULL)
669 return false;
670
671 ox = img->x;
672 oy = img->y;
673
674 switch (dir) {
675 case DIR_LEFT:
676 img->x = 0;
677 break;
678 case DIR_RIGHT:
679 img->x = img->win->w - img->w * img->zoom;
680 break;
681 case DIR_UP:
682 img->y = 0;
683 break;
684 case DIR_DOWN:
685 img->y = img->win->h - img->h * img->zoom;
686 break;
687 }
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, bool restart)
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 if (restart || GIF_LOOP == 1) {
835 img_frame_goto(img, 0);
836 } else if (GIF_LOOP == -1 && img->multi.repeat != 0) {
837 if (img->multi.repeat > 0)
838 img->multi.repeat--;
839 img_frame_goto(img, 0);
840 } else {
841 img->multi.animate = false;
842 return false;
843 }
844 } else if (!restart) {
845 img_frame_goto(img, img->multi.sel + 1);
846 }
847 img->multi.animate = true;
848 img->dirty = true;
849
850 return true;
851}