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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 { MIN_GIF_DELAY = 25 };
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 = false;
89 img->multi.length = img->multi.repeat = 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 = img->multi.repeat = 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 if (delay)
198 delay = MAX(delay, MIN_GIF_DELAY);
199
200 disposal = (unsigned int) ext[1] >> 2 & 0x7;
201 } else if (ext_code == APPLICATION_EXT_FUNC_CODE) {
202 if (ext[0] == 11 && memcmp(ext+1, "NETSCAPE2.0", 11) == 0) {
203 DGifGetExtensionNext(gif, &ext);
204 if (ext && ext[0] == 3 && ext[1] == 1)
205 img->multi.repeat = ((int) ext[3] << 8 | (int) ext[2]) - 1;
206 }
207 }
208 ext = NULL;
209 DGifGetExtensionNext(gif, &ext);
210 }
211 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
212 if (DGifGetImageDesc(gif) == GIF_ERROR) {
213 err = true;
214 break;
215 }
216 x = gif->Image.Left;
217 y = gif->Image.Top;
218 w = gif->Image.Width;
219 h = gif->Image.Height;
220
221 rows = (GifRowType*) s_malloc(h * sizeof(GifRowType));
222 for (i = 0; i < h; i++)
223 rows[i] = (GifRowType) s_malloc(w * sizeof(GifPixelType));
224 if (gif->Image.Interlace) {
225 for (i = 0; i < 4; i++) {
226 for (j = intoffset[i]; j < h; j += intjump[i])
227 DGifGetLine(gif, rows[j], w);
228 }
229 } else {
230 for (i = 0; i < h; i++)
231 DGifGetLine(gif, rows[i], w);
232 }
233
234 ptr = data = (DATA32*) s_malloc(sizeof(DATA32) * sw * sh);
235 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
236 r = cmap->Colors[bg].Red;
237 g = cmap->Colors[bg].Green;
238 b = cmap->Colors[bg].Blue;
239 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
240
241 for (i = 0; i < sh; i++) {
242 for (j = 0; j < sw; j++) {
243 if (i < y || i >= y + h || j < x || j >= x + w ||
244 rows[i-y][j-x] == transp)
245 {
246 if (prev_frame != NULL && (prev_disposal != 2 ||
247 i < py || i >= py + ph || j < px || j >= px + pw))
248 {
249 *ptr = prev_frame[i * sw + j];
250 } else {
251 *ptr = bgpixel;
252 }
253 } else {
254 r = cmap->Colors[rows[i-y][j-x]].Red;
255 g = cmap->Colors[rows[i-y][j-x]].Green;
256 b = cmap->Colors[rows[i-y][j-x]].Blue;
257 *ptr = 0xff << 24 | r << 16 | g << 8 | b;
258 }
259 ptr++;
260 }
261 }
262
263 im = imlib_create_image_using_copied_data(sw, sh, data);
264
265 for (i = 0; i < h; i++)
266 free(rows[i]);
267 free(rows);
268 free(data);
269
270 if (im == NULL) {
271 err = true;
272 break;
273 }
274
275 imlib_context_set_image(im);
276 imlib_image_set_format("gif");
277 if (transp >= 0)
278 imlib_image_set_has_alpha(1);
279
280 if (disposal != 3)
281 prev_frame = imlib_image_get_data_for_reading_only();
282 prev_disposal = disposal;
283 px = x, py = y, pw = w, ph = h;
284
285 if (img->multi.cnt == img->multi.cap) {
286 img->multi.cap *= 2;
287 img->multi.frames = (img_frame_t*)
288 s_realloc(img->multi.frames,
289 img->multi.cap * sizeof(img_frame_t));
290 }
291 img->multi.frames[img->multi.cnt].im = im;
292 img->multi.frames[img->multi.cnt].delay = delay ? delay : GIF_DELAY;
293 img->multi.length += img->multi.frames[img->multi.cnt].delay;
294 img->multi.cnt++;
295 }
296 } while (rec != TERMINATE_RECORD_TYPE);
297
298#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
299 DGifCloseFile(gif, NULL);
300#else
301 DGifCloseFile(gif);
302#endif
303
304 if (err && !file->loaded)
305 warn("corrupted gif file: %s", file->name);
306
307 if (img->multi.cnt > 1) {
308 imlib_context_set_image(img->im);
309 imlib_free_image();
310 img->im = img->multi.frames[0].im;
311 img->multi.animate = GIF_AUTOPLAY;
312 } else if (img->multi.cnt == 1) {
313 imlib_context_set_image(img->multi.frames[0].im);
314 imlib_free_image();
315 img->multi.cnt = 0;
316 img->multi.animate = false;
317 }
318
319 imlib_context_set_image(img->im);
320
321 return !err;
322}
323#endif /* HAVE_GIFLIB */
324
325bool img_load(img_t *img, const fileinfo_t *file)
326{
327 const char *fmt;
328
329 if (img == NULL || file == NULL || file->name == NULL || file->path == NULL)
330 return false;
331
332 if (access(file->path, R_OK) < 0 ||
333 (img->im = imlib_load_image(file->path)) == NULL)
334 {
335 warn("could not open image: %s", file->name);
336 return false;
337 }
338
339 imlib_context_set_image(img->im);
340 imlib_image_set_changes_on_disk();
341
342#if HAVE_LIBEXIF
343 exif_auto_orientate(file);
344#endif
345
346 if ((fmt = imlib_image_format()) != NULL) {
347#if HAVE_GIFLIB
348 if (STREQ(fmt, "gif"))
349 img_load_gif(img, file);
350#endif
351 }
352 img_apply_gamma(img);
353
354 img->w = imlib_image_get_width();
355 img->h = imlib_image_get_height();
356 img->checkpan = true;
357 img->dirty = true;
358
359 return true;
360}
361
362void img_close(img_t *img, bool decache)
363{
364 int i;
365
366 if (img == NULL)
367 return;
368
369 if (img->multi.cnt > 0) {
370 for (i = 0; i < img->multi.cnt; i++) {
371 imlib_context_set_image(img->multi.frames[i].im);
372 imlib_free_image();
373 }
374 img->multi.cnt = 0;
375 img->im = NULL;
376 } else if (img->im != NULL) {
377 imlib_context_set_image(img->im);
378 if (decache)
379 imlib_free_image_and_decache();
380 else
381 imlib_free_image();
382 img->im = NULL;
383 }
384
385 if (img->cmod)
386 imlib_context_set_color_modifier(NULL);
387}
388
389void img_check_pan(img_t *img, bool moved)
390{
391 win_t *win;
392 int ox, oy;
393 float w, h;
394
395 if (img == NULL || img->im == NULL || img->win == NULL)
396 return;
397
398 win = img->win;
399 w = img->w * img->zoom;
400 h = img->h * img->zoom;
401 ox = img->x;
402 oy = img->y;
403
404 if (w < win->w)
405 img->x = (win->w - w) / 2;
406 else if (img->x > 0)
407 img->x = 0;
408 else if (img->x + w < win->w)
409 img->x = win->w - w;
410 if (h < win->h)
411 img->y = (win->h - h) / 2;
412 else if (img->y > 0)
413 img->y = 0;
414 else if (img->y + h < win->h)
415 img->y = win->h - h;
416
417 if (!moved && (ox != img->x || oy != img->y))
418 img->dirty = true;
419}
420
421bool img_fit(img_t *img)
422{
423 float z, zmax, zw, zh;
424
425 if (img == NULL || img->im == NULL || img->win == NULL)
426 return false;
427 if (img->scalemode == SCALE_ZOOM)
428 return false;
429
430 zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
431 zw = (float) img->win->w / (float) img->w;
432 zh = (float) img->win->h / (float) img->h;
433
434 switch (img->scalemode) {
435 case SCALE_WIDTH:
436 z = zw;
437 break;
438 case SCALE_HEIGHT:
439 z = zh;
440 break;
441 default:
442 z = MIN(zw, zh);
443 break;
444 }
445
446 z = MAX(z, zoom_min);
447 z = MIN(z, zmax);
448
449 if (zoomdiff(z, img->zoom) != 0) {
450 img->zoom = z;
451 img->dirty = true;
452 return true;
453 } else {
454 return false;
455 }
456}
457
458void img_render(img_t *img)
459{
460 win_t *win;
461 int sx, sy, sw, sh;
462 int dx, dy, dw, dh;
463 Imlib_Image bg;
464 unsigned long c;
465
466 if (img == NULL || img->im == NULL || img->win == NULL)
467 return;
468
469 win = img->win;
470 img_fit(img);
471
472 if (img->checkpan) {
473 img_check_pan(img, false);
474 img->checkpan = false;
475 }
476
477 if (!img->dirty)
478 return;
479
480 /* calculate source and destination offsets:
481 * - part of image drawn on full window, or
482 * - full image drawn on part of window
483 */
484 if (img->x <= 0) {
485 sx = -img->x / img->zoom;
486 sw = win->w / img->zoom;
487 dx = 0;
488 dw = win->w;
489 } else {
490 sx = 0;
491 sw = img->w;
492 dx = img->x;
493 dw = img->w * img->zoom;
494 }
495 if (img->y <= 0) {
496 sy = -img->y / img->zoom;
497 sh = win->h / img->zoom;
498 dy = 0;
499 dh = win->h;
500 } else {
501 sy = 0;
502 sh = img->h;
503 dy = img->y;
504 dh = img->h * img->zoom;
505 }
506
507 win_clear(win);
508
509 imlib_context_set_image(img->im);
510 imlib_context_set_anti_alias(img->aa);
511 imlib_context_set_drawable(win->pm);
512
513 if (imlib_image_has_alpha()) {
514 if ((bg = imlib_create_image(dw, dh)) == NULL)
515 die("could not allocate memory");
516 imlib_context_set_image(bg);
517 imlib_image_set_has_alpha(0);
518
519 if (img->alpha) {
520 int i, c, r;
521 DATA32 col[2] = { 0xFF666666, 0xFF999999 };
522 DATA32 * data = imlib_image_get_data();
523
524 for (r = 0; r < dh; r++) {
525 i = r * dw;
526 if (r == 0 || r == 8) {
527 for (c = 0; c < dw; c++)
528 data[i++] = col[!(c & 8) ^ !r];
529 } else {
530 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
531 }
532 }
533 imlib_image_put_back_data(data);
534 } else {
535 c = win->fullscreen ? win->fscol : win->bgcol;
536 imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
537 imlib_image_fill_rectangle(0, 0, dw, dh);
538 }
539 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
540 imlib_context_set_color_modifier(NULL);
541 imlib_render_image_on_drawable(dx, dy);
542
543 imlib_free_image();
544 if (img->gamma != 0)
545 imlib_context_set_color_modifier(img->cmod);
546 } else {
547 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
548 }
549 img->dirty = false;
550}
551
552bool img_fit_win(img_t *img, scalemode_t sm)
553{
554 float oz;
555
556 if (img == NULL || img->im == NULL || img->win == NULL)
557 return false;
558
559 oz = img->zoom;
560 img->scalemode = sm;
561
562 if (img_fit(img)) {
563 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
564 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
565 img->checkpan = true;
566 return true;
567 } else {
568 return false;
569 }
570}
571
572bool img_zoom(img_t *img, float z)
573{
574 if (img == NULL || img->im == NULL || img->win == NULL)
575 return false;
576
577 z = MAX(z, zoom_min);
578 z = MIN(z, zoom_max);
579
580 img->scalemode = SCALE_ZOOM;
581
582 if (zoomdiff(z, img->zoom) != 0) {
583 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
584 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
585 img->zoom = z;
586 img->checkpan = true;
587 img->dirty = true;
588 return true;
589 } else {
590 return false;
591 }
592}
593
594bool img_zoom_in(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 = 1; i < ARRLEN(zoom_levels); 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_zoom_out(img_t *img)
611{
612 int i;
613 float z;
614
615 if (img == NULL || img->im == NULL)
616 return false;
617
618 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
619 z = zoom_levels[i] / 100.0;
620 if (zoomdiff(z, img->zoom) < 0)
621 return img_zoom(img, z);
622 }
623 return false;
624}
625
626bool img_move(img_t *img, float dx, float dy)
627{
628 float ox, oy;
629
630 if (img == NULL || img->im == NULL)
631 return false;
632
633 ox = img->x;
634 oy = img->y;
635
636 img->x += dx;
637 img->y += dy;
638
639 img_check_pan(img, true);
640
641 if (ox != img->x || oy != img->y) {
642 img->dirty = true;
643 return true;
644 } else {
645 return false;
646 }
647}
648
649bool img_pan(img_t *img, direction_t dir, int d)
650{
651 /* d < 0: screen-wise
652 * d = 0: 1/5 of screen
653 * d > 0: num of pixels
654 */
655 float x, y;
656
657 if (img == NULL || img->im == NULL || img->win == NULL)
658 return false;
659
660 if (d > 0) {
661 x = y = MAX(1, (float) d * img->zoom);
662 } else {
663 x = img->win->w / (d < 0 ? 1 : 5);
664 y = img->win->h / (d < 0 ? 1 : 5);
665 }
666
667 switch (dir) {
668 case DIR_LEFT:
669 return img_move(img, x, 0.0);
670 case DIR_RIGHT:
671 return img_move(img, -x, 0.0);
672 case DIR_UP:
673 return img_move(img, 0.0, y);
674 case DIR_DOWN:
675 return img_move(img, 0.0, -y);
676 }
677 return false;
678}
679
680bool img_pan_edge(img_t *img, direction_t dir)
681{
682 int ox, oy;
683
684 if (img == NULL || img->im == NULL || img->win == NULL)
685 return false;
686
687 ox = img->x;
688 oy = img->y;
689
690 switch (dir) {
691 case DIR_LEFT:
692 img->x = 0;
693 break;
694 case DIR_RIGHT:
695 img->x = img->win->w - img->w * img->zoom;
696 break;
697 case DIR_UP:
698 img->y = 0;
699 break;
700 case DIR_DOWN:
701 img->y = img->win->h - img->h * img->zoom;
702 break;
703 }
704
705 img_check_pan(img, true);
706
707 if (ox != img->x || oy != img->y) {
708 img->dirty = true;
709 return true;
710 } else {
711 return false;
712 }
713}
714
715void img_rotate(img_t *img, degree_t d)
716{
717 int i, ox, oy, tmp;
718
719 if (img == NULL || img->im == NULL || img->win == NULL)
720 return;
721
722 imlib_context_set_image(img->im);
723 imlib_image_orientate(d);
724
725 for (i = 0; i < img->multi.cnt; i++) {
726 if (i != img->multi.sel) {
727 imlib_context_set_image(img->multi.frames[i].im);
728 imlib_image_orientate(d);
729 }
730 }
731 if (d == DEGREE_90 || d == DEGREE_270) {
732 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
733 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
734
735 img->x = oy + (img->win->w - img->win->h) / 2;
736 img->y = ox + (img->win->h - img->win->w) / 2;
737
738 tmp = img->w;
739 img->w = img->h;
740 img->h = tmp;
741 img->checkpan = true;
742 }
743 img->dirty = true;
744}
745
746void img_flip(img_t *img, flipdir_t d)
747{
748 int i;
749 void (*imlib_flip_op[3])(void) = {
750 imlib_image_flip_horizontal,
751 imlib_image_flip_vertical,
752 imlib_image_flip_diagonal
753 };
754
755 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
756
757 if (img == NULL || img->im == NULL || d < 0 || d >= ARRLEN(imlib_flip_op))
758 return;
759
760 imlib_context_set_image(img->im);
761 imlib_flip_op[d]();
762
763 for (i = 0; i < img->multi.cnt; i++) {
764 if (i != img->multi.sel) {
765 imlib_context_set_image(img->multi.frames[i].im);
766 imlib_flip_op[d]();
767 }
768 }
769 img->dirty = true;
770}
771
772void img_toggle_antialias(img_t *img)
773{
774 if (img == NULL || img->im == NULL)
775 return;
776
777 img->aa = !img->aa;
778 imlib_context_set_image(img->im);
779 imlib_context_set_anti_alias(img->aa);
780 img->dirty = true;
781}
782
783bool img_change_gamma(img_t *img, int d)
784{
785 /* d < 0: decrease gamma
786 * d = 0: reset gamma
787 * d > 0: increase gamma
788 */
789 int gamma;
790
791 if (img == NULL || img->im == NULL)
792 return false;
793
794 if (d == 0)
795 gamma = 0;
796 else if (d < 0)
797 gamma = MAX(-GAMMA_RANGE, img->gamma - 1);
798 else
799 gamma = MIN(+GAMMA_RANGE, img->gamma + 1);
800
801 if (img->gamma != gamma) {
802 img->gamma = gamma;
803 img_apply_gamma(img);
804 img->dirty = true;
805 return true;
806 } else {
807 return false;
808 }
809}
810
811bool img_frame_goto(img_t *img, int n)
812{
813 if (img == NULL || img->im == NULL)
814 return false;
815 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
816 return false;
817
818 img->multi.sel = n;
819 img->im = img->multi.frames[n].im;
820
821 imlib_context_set_image(img->im);
822 img->w = imlib_image_get_width();
823 img->h = imlib_image_get_height();
824 img->checkpan = true;
825 img->dirty = true;
826
827 return true;
828}
829
830bool img_frame_navigate(img_t *img, int d)
831{
832 if (img == NULL|| img->im == NULL || img->multi.cnt == 0 || d == 0)
833 return false;
834
835 d += img->multi.sel;
836 if (d < 0)
837 d = 0;
838 else if (d >= img->multi.cnt)
839 d = img->multi.cnt - 1;
840
841 return img_frame_goto(img, d);
842}
843
844bool img_frame_animate(img_t *img, bool restart)
845{
846 if (img == NULL || img->im == NULL || img->multi.cnt == 0)
847 return false;
848
849 if (img->multi.sel + 1 >= img->multi.cnt) {
850 if (restart || GIF_LOOP == 1) {
851 img_frame_goto(img, 0);
852 } else if (GIF_LOOP == -1 && img->multi.repeat != 0) {
853 if (img->multi.repeat > 0)
854 img->multi.repeat--;
855 img_frame_goto(img, 0);
856 } else {
857 img->multi.animate = false;
858 return false;
859 }
860 } else if (!restart) {
861 img_frame_goto(img, img->multi.sel + 1);
862 }
863 img->multi.animate = true;
864 img->dirty = true;
865
866 return true;
867}