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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#define _RENDER_CONFIG
22
23#include <stdlib.h>
24#include <string.h>
25#include <sys/types.h>
26#include <unistd.h>
27
28#if HAVE_GIFLIB
29#include <gif_lib.h>
30enum { MIN_GIF_DELAY = 25 };
31#endif
32
33#include "exif.h"
34#include "image.h"
35#include "options.h"
36#include "util.h"
37#include "config.h"
38
39float zoom_min;
40float zoom_max;
41
42static int zoomdiff(float z1, float z2)
43{
44 return (int) (z1 * 1000.0 - z2 * 1000.0);
45}
46
47static void img_apply_gamma(img_t *img)
48{
49 if (img == NULL || img->im == NULL || img->cmod == NULL)
50 return;
51
52 if (img->gamma == 0) {
53 imlib_context_set_color_modifier(NULL);
54 } else {
55 double range = img->gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
56
57 imlib_context_set_color_modifier(img->cmod);
58 imlib_reset_color_modifier();
59 imlib_modify_color_modifier_gamma(1.0 + img->gamma * (range / GAMMA_RANGE));
60 }
61}
62
63void img_init(img_t *img, win_t *win)
64{
65 zoom_min = zoom_levels[0] / 100.0;
66 zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
67
68 if (img == NULL || win == NULL)
69 return;
70
71 imlib_context_set_display(win->env.dpy);
72 imlib_context_set_visual(win->env.vis);
73 imlib_context_set_colormap(win->env.cmap);
74
75 img->im = NULL;
76 img->win = win;
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 = RENDER_ANTI_ALIAS;
83 img->alpha = !RENDER_WHITE_ALPHA;
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->scalemode = options->scalemode;
337 img->checkpan = true;
338 img->dirty = true;
339
340 return true;
341}
342
343void img_close(img_t *img, bool decache)
344{
345 int i;
346
347 if (img == NULL)
348 return;
349
350 if (img->multi.cnt > 0) {
351 for (i = 0; i < img->multi.cnt; i++) {
352 imlib_context_set_image(img->multi.frames[i].im);
353 imlib_free_image();
354 }
355 img->multi.cnt = 0;
356 img->im = NULL;
357 } else if (img->im != NULL) {
358 imlib_context_set_image(img->im);
359 if (decache)
360 imlib_free_image_and_decache();
361 else
362 imlib_free_image();
363 img->im = NULL;
364 }
365
366 if (img->cmod)
367 imlib_context_set_color_modifier(NULL);
368}
369
370void img_check_pan(img_t *img, bool moved)
371{
372 win_t *win;
373 int ox, oy;
374 float w, h;
375
376 if (img == NULL || img->im == NULL || img->win == NULL)
377 return;
378
379 win = img->win;
380 w = img->w * img->zoom;
381 h = img->h * img->zoom;
382 ox = img->x;
383 oy = img->y;
384
385 if (w < win->w)
386 img->x = (win->w - w) / 2;
387 else if (img->x > 0)
388 img->x = 0;
389 else if (img->x + w < win->w)
390 img->x = win->w - w;
391 if (h < win->h)
392 img->y = (win->h - h) / 2;
393 else if (img->y > 0)
394 img->y = 0;
395 else if (img->y + h < win->h)
396 img->y = win->h - h;
397
398 if (!moved && (ox != img->x || oy != img->y))
399 img->dirty = true;
400}
401
402bool img_fit(img_t *img)
403{
404 float z, zmax, zw, zh;
405
406 if (img == NULL || img->im == NULL || img->win == NULL)
407 return false;
408 if (img->scalemode == SCALE_ZOOM)
409 return false;
410
411 zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
412 zw = (float) img->win->w / (float) img->w;
413 zh = (float) img->win->h / (float) img->h;
414
415 switch (img->scalemode) {
416 case SCALE_WIDTH:
417 z = zw;
418 break;
419 case SCALE_HEIGHT:
420 z = zh;
421 break;
422 default:
423 z = MIN(zw, zh);
424 break;
425 }
426
427 z = MAX(z, zoom_min);
428 z = MIN(z, zmax);
429
430 if (zoomdiff(z, img->zoom) != 0) {
431 img->zoom = z;
432 img->dirty = true;
433 return true;
434 } else {
435 return false;
436 }
437}
438
439void img_render(img_t *img)
440{
441 win_t *win;
442 int sx, sy, sw, sh;
443 int dx, dy, dw, dh;
444
445 if (img == NULL || img->im == NULL || img->win == NULL)
446 return;
447
448 win = img->win;
449 img_fit(img);
450
451 if (img->checkpan) {
452 img_check_pan(img, false);
453 img->checkpan = false;
454 }
455
456 if (!img->dirty)
457 return;
458
459 /* calculate source and destination offsets */
460 if (img->x < 0) {
461 sx = -img->x / img->zoom;
462 sw = win->w / img->zoom;
463 dx = 0;
464 dw = win->w;
465 } else {
466 sx = 0;
467 sw = img->w;
468 dx = img->x;
469 dw = img->w * img->zoom;
470 }
471 if (img->y < 0) {
472 sy = -img->y / img->zoom;
473 sh = win->h / img->zoom;
474 dy = 0;
475 dh = win->h;
476 } else {
477 sy = 0;
478 sh = img->h;
479 dy = img->y;
480 dh = img->h * img->zoom;
481 }
482
483 win_clear(win);
484
485 imlib_context_set_image(img->im);
486 imlib_context_set_anti_alias(img->aa);
487
488 if (!img->alpha && imlib_image_has_alpha())
489 win_draw_rect(win, win->pm, dx, dy, dw, dh, True, 0, win->white);
490
491 imlib_context_set_drawable(win->pm);
492 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
493
494 img->dirty = false;
495}
496
497bool img_fit_win(img_t *img, scalemode_t sm)
498{
499 float oz;
500
501 if (img == NULL || img->im == NULL || img->win == NULL)
502 return false;
503
504 oz = img->zoom;
505 img->scalemode = sm;
506
507 if (img_fit(img)) {
508 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
509 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
510 img->checkpan = true;
511 return true;
512 } else {
513 return false;
514 }
515}
516
517bool img_zoom(img_t *img, float z)
518{
519 if (img == NULL || img->im == NULL || img->win == NULL)
520 return false;
521
522 z = MAX(z, zoom_min);
523 z = MIN(z, zoom_max);
524
525 img->scalemode = SCALE_ZOOM;
526
527 if (zoomdiff(z, img->zoom) != 0) {
528 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
529 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
530 img->zoom = z;
531 img->checkpan = true;
532 img->dirty = true;
533 return true;
534 } else {
535 return false;
536 }
537}
538
539bool img_zoom_in(img_t *img)
540{
541 int i;
542 float z;
543
544 if (img == NULL || img->im == NULL)
545 return false;
546
547 for (i = 1; i < ARRLEN(zoom_levels); i++) {
548 z = zoom_levels[i] / 100.0;
549 if (zoomdiff(z, img->zoom) > 0)
550 return img_zoom(img, z);
551 }
552 return false;
553}
554
555bool img_zoom_out(img_t *img)
556{
557 int i;
558 float z;
559
560 if (img == NULL || img->im == NULL)
561 return false;
562
563 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
564 z = zoom_levels[i] / 100.0;
565 if (zoomdiff(z, img->zoom) < 0)
566 return img_zoom(img, z);
567 }
568 return false;
569}
570
571bool img_move(img_t *img, float dx, float dy)
572{
573 float ox, oy;
574
575 if (img == NULL || img->im == NULL)
576 return false;
577
578 ox = img->x;
579 oy = img->y;
580
581 img->x += dx;
582 img->y += dy;
583
584 img_check_pan(img, true);
585
586 if (ox != img->x || oy != img->y) {
587 img->dirty = true;
588 return true;
589 } else {
590 return false;
591 }
592}
593
594bool img_pan(img_t *img, direction_t dir, int d)
595{
596 /* d < 0: screen-wise
597 * d = 0: 1/5 of screen
598 * d > 0: num of pixels
599 */
600 float x, y;
601
602 if (img == NULL || img->im == NULL || img->win == NULL)
603 return false;
604
605 if (d > 0) {
606 x = y = MAX(1, (float) d * img->zoom);
607 } else {
608 x = img->win->w / (d < 0 ? 1 : 5);
609 y = img->win->h / (d < 0 ? 1 : 5);
610 }
611
612 switch (dir) {
613 case DIR_LEFT:
614 return img_move(img, x, 0.0);
615 case DIR_RIGHT:
616 return img_move(img, -x, 0.0);
617 case DIR_UP:
618 return img_move(img, 0.0, y);
619 case DIR_DOWN:
620 return img_move(img, 0.0, -y);
621 }
622 return false;
623}
624
625bool img_pan_edge(img_t *img, direction_t dir)
626{
627 int ox, oy;
628
629 if (img == NULL || img->im == NULL || img->win == NULL)
630 return false;
631
632 ox = img->x;
633 oy = img->y;
634
635 switch (dir) {
636 case DIR_LEFT:
637 img->x = 0;
638 break;
639 case DIR_RIGHT:
640 img->x = img->win->w - img->w * img->zoom;
641 break;
642 case DIR_UP:
643 img->y = 0;
644 break;
645 case DIR_DOWN:
646 img->y = img->win->h - img->h * img->zoom;
647 break;
648 }
649
650 img_check_pan(img, true);
651
652 if (ox != img->x || oy != img->y) {
653 img->dirty = true;
654 return true;
655 } else {
656 return false;
657 }
658}
659
660void img_rotate(img_t *img, degree_t d)
661{
662 int i, ox, oy, tmp;
663
664 if (img == NULL || img->im == NULL || img->win == NULL)
665 return;
666
667 imlib_context_set_image(img->im);
668 imlib_image_orientate(d);
669
670 for (i = 0; i < img->multi.cnt; i++) {
671 if (i != img->multi.sel) {
672 imlib_context_set_image(img->multi.frames[i].im);
673 imlib_image_orientate(d);
674 }
675 }
676 if (d == DEGREE_90 || d == DEGREE_270) {
677 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
678 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
679
680 img->x = oy + (img->win->w - img->win->h) / 2;
681 img->y = ox + (img->win->h - img->win->w) / 2;
682
683 tmp = img->w;
684 img->w = img->h;
685 img->h = tmp;
686 img->checkpan = true;
687 }
688 img->dirty = true;
689}
690
691void img_flip(img_t *img, flipdir_t d)
692{
693 int i;
694 void (*imlib_flip_op[3])(void) = {
695 imlib_image_flip_horizontal,
696 imlib_image_flip_vertical,
697 imlib_image_flip_diagonal
698 };
699
700 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
701
702 if (img == NULL || img->im == NULL || d < 0 || d >= ARRLEN(imlib_flip_op))
703 return;
704
705 imlib_context_set_image(img->im);
706 imlib_flip_op[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_flip_op[d]();
712 }
713 }
714 img->dirty = true;
715}
716
717void img_toggle_antialias(img_t *img)
718{
719 if (img == NULL || img->im == NULL)
720 return;
721
722 img->aa = !img->aa;
723 imlib_context_set_image(img->im);
724 imlib_context_set_anti_alias(img->aa);
725 img->dirty = true;
726}
727
728bool img_change_gamma(img_t *img, int d)
729{
730 /* d < 0: decrease gamma
731 * d = 0: reset gamma
732 * d > 0: increase gamma
733 */
734 int gamma;
735
736 if (img == NULL || img->im == NULL)
737 return false;
738
739 if (d == 0)
740 gamma = 0;
741 else if (d < 0)
742 gamma = MAX(-GAMMA_RANGE, img->gamma - 1);
743 else
744 gamma = MIN(+GAMMA_RANGE, img->gamma + 1);
745
746 if (img->gamma != gamma) {
747 img->gamma = gamma;
748 img_apply_gamma(img);
749 img->dirty = true;
750 return true;
751 } else {
752 return false;
753 }
754}
755
756bool img_frame_goto(img_t *img, int n)
757{
758 if (img == NULL || img->im == NULL)
759 return false;
760 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
761 return false;
762
763 img->multi.sel = n;
764 img->im = img->multi.frames[n].im;
765
766 imlib_context_set_image(img->im);
767 img->w = imlib_image_get_width();
768 img->h = imlib_image_get_height();
769 img->checkpan = true;
770 img->dirty = true;
771
772 return true;
773}
774
775bool img_frame_navigate(img_t *img, int d)
776{
777 if (img == NULL|| img->im == NULL || img->multi.cnt == 0 || d == 0)
778 return false;
779
780 d += img->multi.sel;
781 if (d < 0)
782 d = 0;
783 else if (d >= img->multi.cnt)
784 d = img->multi.cnt - 1;
785
786 return img_frame_goto(img, d);
787}
788
789bool img_frame_animate(img_t *img, bool restart)
790{
791 if (img == NULL || img->im == NULL || img->multi.cnt == 0)
792 return false;
793
794 if (img->multi.sel + 1 >= img->multi.cnt) {
795 if (restart || GIF_LOOP == 1) {
796 img_frame_goto(img, 0);
797 } else if (GIF_LOOP == -1 && img->multi.repeat != 0) {
798 if (img->multi.repeat > 0)
799 img->multi.repeat--;
800 img_frame_goto(img, 0);
801 } else {
802 img->multi.animate = false;
803 return false;
804 }
805 } else if (!restart) {
806 img_frame_goto(img, img->multi.sel + 1);
807 }
808 img->multi.animate = true;
809 img->dirty = true;
810
811 return true;
812}