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nsxivimage.c

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1/* sxiv: image.c
2 * Copyright (c) 2012 Bert Muennich <be.muennich at googlemail.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include <gif_lib.h>
27
28#include "exif.h"
29#include "image.h"
30#include "options.h"
31#include "util.h"
32#include "config.h"
33
34enum { MIN_GIF_DELAY = 50 };
35
36float zoom_min;
37float zoom_max;
38
39int zoomdiff(float z1, float z2) {
40 float d = z1 - z2;
41 const float mindelta = 0.001;
42
43 if (ABS(d) < mindelta)
44 return 0;
45 else
46 return d < 0 ? -1 : 1;
47}
48
49void img_init(img_t *img, win_t *win) {
50 zoom_min = zoom_levels[0] / 100.0;
51 zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
52
53 if (img == NULL || win == NULL)
54 return;
55
56 imlib_context_set_display(win->env.dpy);
57 imlib_context_set_visual(win->env.vis);
58 imlib_context_set_colormap(win->env.cmap);
59
60 img->im = NULL;
61 img->win = win;
62 img->zoom = options->zoom;
63 img->zoom = MAX(img->zoom, zoom_min);
64 img->zoom = MIN(img->zoom, zoom_max);
65 img->checkpan = false;
66 img->dirty = false;
67 img->aa = options->aa;
68 img->alpha = true;
69 img->multi.cap = img->multi.cnt = 0;
70 img->multi.animate = false;
71}
72
73void exif_auto_orientate(const fileinfo_t *file) {
74 switch (exif_orientation(file)) {
75 case 5:
76 imlib_image_orientate(1);
77 case 2:
78 imlib_image_flip_vertical();
79 break;
80
81 case 3:
82 imlib_image_orientate(2);
83 break;
84
85 case 7:
86 imlib_image_orientate(1);
87 case 4:
88 imlib_image_flip_horizontal();
89 break;
90
91 case 6:
92 imlib_image_orientate(1);
93 break;
94
95 case 8:
96 imlib_image_orientate(3);
97 break;
98 }
99}
100
101bool img_load_gif(img_t *img, const fileinfo_t *file) {
102 GifFileType *gif;
103 GifRowType *rows = NULL;
104 GifRecordType rec;
105 ColorMapObject *cmap;
106 DATA32 bgpixel, *data, *ptr;
107 DATA32 *prev_frame = NULL;
108 Imlib_Image *im;
109 int i, j, bg, r, g, b;
110 int x, y, w, h, sw, sh;
111 int px, py, pw, ph;
112 int intoffset[] = { 0, 4, 2, 1 };
113 int intjump[] = { 8, 8, 4, 2 };
114 int transp = -1;
115 unsigned int disposal = 0, prev_disposal = 0;
116 unsigned int delay = 0;
117 bool err = false;
118
119 if (img->multi.cap == 0) {
120 img->multi.cap = 8;
121 img->multi.frames = (img_frame_t*)
122 s_malloc(sizeof(img_frame_t) * img->multi.cap);
123 }
124 img->multi.cnt = 0;
125 img->multi.sel = 0;
126
127 gif = DGifOpenFileName(file->path);
128 if (gif == NULL) {
129 warn("could not open gif file: %s", file->name);
130 return false;
131 }
132 bg = gif->SBackGroundColor;
133 sw = gif->SWidth;
134 sh = gif->SHeight;
135 px = py = pw = ph = 0;
136
137 do {
138 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
139 err = true;
140 break;
141 }
142 if (rec == EXTENSION_RECORD_TYPE) {
143 int ext_code;
144 GifByteType *ext = NULL;
145
146 DGifGetExtension(gif, &ext_code, &ext);
147 while (ext) {
148 if (ext_code == 0xf9) {
149 if (ext[1] & 1)
150 transp = (int) ext[4];
151 else
152 transp = -1;
153
154 delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
155 if (delay)
156 delay = MAX(delay, MIN_GIF_DELAY);
157
158 disposal = (unsigned int) ext[1] >> 2 & 0x7;
159 }
160 ext = NULL;
161 DGifGetExtensionNext(gif, &ext);
162 }
163 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
164 if (DGifGetImageDesc(gif) == GIF_ERROR) {
165 err = true;
166 break;
167 }
168 x = gif->Image.Left;
169 y = gif->Image.Top;
170 w = gif->Image.Width;
171 h = gif->Image.Height;
172
173 rows = (GifRowType*) s_malloc(h * sizeof(GifRowType));
174 for (i = 0; i < h; i++)
175 rows[i] = (GifRowType) s_malloc(w * sizeof(GifPixelType));
176 if (gif->Image.Interlace) {
177 for (i = 0; i < 4; i++) {
178 for (j = intoffset[i]; j < h; j += intjump[i])
179 DGifGetLine(gif, rows[j], w);
180 }
181 } else {
182 for (i = 0; i < h; i++)
183 DGifGetLine(gif, rows[i], w);
184 }
185
186 ptr = data = (DATA32*) s_malloc(sizeof(DATA32) * sw * sh);
187 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
188 r = cmap->Colors[bg].Red;
189 g = cmap->Colors[bg].Green;
190 b = cmap->Colors[bg].Blue;
191 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
192
193 for (i = 0; i < sh; i++) {
194 for (j = 0; j < sw; j++) {
195 if (i < y || i >= y + h || j < x || j >= x + w ||
196 rows[i-y][j-x] == transp)
197 {
198 if (prev_frame != NULL && (prev_disposal != 2 ||
199 i < py || i >= py + ph || j < px || j >= px + pw))
200 {
201 *ptr = prev_frame[i * sw + j];
202 } else {
203 *ptr = bgpixel;
204 }
205 } else {
206 r = cmap->Colors[rows[i-y][j-x]].Red;
207 g = cmap->Colors[rows[i-y][j-x]].Green;
208 b = cmap->Colors[rows[i-y][j-x]].Blue;
209 *ptr = 0xff << 24 | r << 16 | g << 8 | b;
210 }
211 ptr++;
212 }
213 }
214
215 im = imlib_create_image_using_copied_data(sw, sh, data);
216
217 for (i = 0; i < h; i++)
218 free(rows[i]);
219 free(rows);
220 free(data);
221
222 if (im == NULL) {
223 err = true;
224 break;
225 }
226
227 imlib_context_set_image(im);
228 imlib_image_set_format("gif");
229 if (transp >= 0)
230 imlib_image_set_has_alpha(1);
231
232 if (disposal != 3)
233 prev_frame = imlib_image_get_data_for_reading_only();
234 prev_disposal = disposal;
235 px = x, py = y, pw = w, ph = h;
236
237 if (img->multi.cnt == img->multi.cap) {
238 img->multi.cap *= 2;
239 img->multi.frames = (img_frame_t*)
240 s_realloc(img->multi.frames,
241 img->multi.cap * sizeof(img_frame_t));
242 }
243 img->multi.frames[img->multi.cnt].im = im;
244 img->multi.frames[img->multi.cnt].delay = delay ? delay : GIF_DELAY;
245 img->multi.cnt++;
246 }
247 } while (rec != TERMINATE_RECORD_TYPE);
248
249 DGifCloseFile(gif);
250
251 if (err && !file->loaded)
252 warn("corrupted gif file: %s", file->name);
253
254 if (img->multi.cnt > 1) {
255 imlib_context_set_image(img->im);
256 imlib_free_image();
257 img->im = img->multi.frames[0].im;
258 img->multi.animate = GIF_AUTOPLAY;
259 } else if (img->multi.cnt == 1) {
260 imlib_context_set_image(img->multi.frames[0].im);
261 imlib_free_image();
262 img->multi.cnt = 0;
263 img->multi.animate = false;
264 }
265
266 imlib_context_set_image(img->im);
267
268 return !err;
269}
270
271bool img_load(img_t *img, const fileinfo_t *file) {
272 const char *fmt;
273
274 if (img == NULL || file == NULL || file->name == NULL || file->path == NULL)
275 return false;
276
277 if (access(file->path, R_OK) < 0 ||
278 (img->im = imlib_load_image(file->path)) == NULL)
279 {
280 warn("could not open image: %s", file->name);
281 return false;
282 }
283
284 imlib_context_set_image(img->im);
285 imlib_image_set_changes_on_disk();
286
287 if ((fmt = imlib_image_format()) == NULL) {
288 warn("could not open image: %s", file->name);
289 return false;
290 }
291 if (STREQ(fmt, "jpeg"))
292 exif_auto_orientate(file);
293 if (STREQ(fmt, "gif"))
294 img_load_gif(img, file);
295
296 img->w = imlib_image_get_width();
297 img->h = imlib_image_get_height();
298 img->scalemode = options->scalemode;
299 img->re = false;
300 img->checkpan = false;
301 img->dirty = true;
302
303 return true;
304}
305
306void img_close(img_t *img, bool decache) {
307 int i;
308
309 if (img == NULL)
310 return;
311
312 if (img->multi.cnt > 0) {
313 for (i = 0; i < img->multi.cnt; i++) {
314 imlib_context_set_image(img->multi.frames[i].im);
315 imlib_free_image();
316 }
317 img->multi.cnt = 0;
318 img->im = NULL;
319 } else if (img->im != NULL) {
320 imlib_context_set_image(img->im);
321 if (decache)
322 imlib_free_image_and_decache();
323 else
324 imlib_free_image();
325 img->im = NULL;
326 }
327}
328
329void img_check_pan(img_t *img, bool moved) {
330 win_t *win;
331 int ox, oy;
332
333 if (img == NULL || img->im == NULL || img->win == NULL)
334 return;
335
336 win = img->win;
337 ox = img->x;
338 oy = img->y;
339
340 if (img->w * img->zoom > win->w) {
341 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
342 img->x = 0;
343 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
344 img->x = win->w - img->w * img->zoom;
345 } else {
346 img->x = (win->w - img->w * img->zoom) / 2;
347 }
348 if (img->h * img->zoom > win->h) {
349 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
350 img->y = 0;
351 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
352 img->y = win->h - img->h * img->zoom;
353 } else {
354 img->y = (win->h - img->h * img->zoom) / 2;
355 }
356
357 if (!moved && (ox != img->x || oy != img->y))
358 img->dirty = true;
359}
360
361bool img_fit(img_t *img) {
362 float z, zmax, zw, zh;
363
364 if (img == NULL || img->im == NULL || img->win == NULL)
365 return false;
366 if (img->scalemode == SCALE_ZOOM)
367 return false;
368
369 zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
370 zw = (float) img->win->w / (float) img->w;
371 zh = (float) img->win->h / (float) img->h;
372
373 switch (img->scalemode) {
374 case SCALE_WIDTH:
375 z = zw;
376 break;
377 case SCALE_HEIGHT:
378 z = zh;
379 break;
380 default:
381 z = MIN(zw, zh);
382 break;
383 }
384
385 z = MAX(z, zoom_min);
386 z = MIN(z, zmax);
387
388 if (zoomdiff(z, img->zoom) != 0) {
389 img->zoom = z;
390 img->dirty = true;
391 return true;
392 } else {
393 return false;
394 }
395}
396
397void img_render(img_t *img) {
398 win_t *win;
399 int sx, sy, sw, sh;
400 int dx, dy, dw, dh;
401
402 if (img == NULL || img->im == NULL || img->win == NULL)
403 return;
404
405 win = img->win;
406 img_fit(img);
407
408 if (!img->re) {
409 /* rendered for the first time */
410 img->re = true;
411 if (img->zoom * img->w <= win->w)
412 img->x = (win->w - img->w * img->zoom) / 2;
413 else
414 img->x = 0;
415 if (img->zoom * img->h <= win->h)
416 img->y = (win->h - img->h * img->zoom) / 2;
417 else
418 img->y = 0;
419 }
420
421 if (img->checkpan) {
422 img_check_pan(img, false);
423 img->checkpan = false;
424 }
425
426 if (!img->dirty)
427 return;
428
429 /* calculate source and destination offsets */
430 if (img->x < 0) {
431 sx = -img->x / img->zoom;
432 sw = win->w / img->zoom;
433 dx = 0;
434 dw = win->w;
435 } else {
436 sx = 0;
437 sw = img->w;
438 dx = img->x;
439 dw = img->w * img->zoom;
440 }
441 if (img->y < 0) {
442 sy = -img->y / img->zoom;
443 sh = win->h / img->zoom;
444 dy = 0;
445 dh = win->h;
446 } else {
447 sy = 0;
448 sh = img->h;
449 dy = img->y;
450 dh = img->h * img->zoom;
451 }
452
453 win_clear(win);
454
455 imlib_context_set_image(img->im);
456 imlib_context_set_anti_alias(img->aa);
457
458 if (!img->alpha && imlib_image_has_alpha())
459 win_draw_rect(win, win->pm, dx, dy, dw, dh, True, 0, win->white);
460
461 imlib_context_set_drawable(win->pm);
462 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
463
464 img->dirty = false;
465}
466
467bool img_fit_win(img_t *img, scalemode_t sm) {
468 if (img == NULL || img->im == NULL)
469 return false;
470
471 img->scalemode = sm;
472 return img_fit(img);
473}
474
475bool img_center(img_t *img) {
476 int ox, oy;
477
478 if (img == NULL || img->im == NULL || img->win == NULL)
479 return false;
480
481 ox = img->x;
482 oy = img->y;
483
484 img->x = (img->win->w - img->w * img->zoom) / 2;
485 img->y = (img->win->h - img->h * img->zoom) / 2;
486
487 if (ox != img->x || oy != img->y) {
488 img->dirty = true;
489 return true;
490 } else {
491 return false;
492 }
493}
494
495bool img_zoom(img_t *img, float z) {
496 if (img == NULL || img->im == NULL || img->win == NULL)
497 return false;
498
499 z = MAX(z, zoom_min);
500 z = MIN(z, zoom_max);
501
502 img->scalemode = SCALE_ZOOM;
503
504 if (zoomdiff(z, img->zoom) != 0) {
505 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
506 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
507 img->zoom = z;
508 img->checkpan = true;
509 img->dirty = true;
510 return true;
511 } else {
512 return false;
513 }
514}
515
516bool img_zoom_in(img_t *img) {
517 int i;
518 float z;
519
520 if (img == NULL || img->im == NULL)
521 return false;
522
523 for (i = 1; i < ARRLEN(zoom_levels); i++) {
524 z = zoom_levels[i] / 100.0;
525 if (zoomdiff(z, img->zoom) > 0)
526 return img_zoom(img, z);
527 }
528 return false;
529}
530
531bool img_zoom_out(img_t *img) {
532 int i;
533 float z;
534
535 if (img == NULL || img->im == NULL)
536 return false;
537
538 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
539 z = zoom_levels[i] / 100.0;
540 if (zoomdiff(z, img->zoom) < 0)
541 return img_zoom(img, z);
542 }
543 return false;
544}
545
546bool img_move(img_t *img, float dx, float dy) {
547 float ox, oy;
548
549 if (img == NULL || img->im == NULL)
550 return false;
551
552 ox = img->x;
553 oy = img->y;
554
555 img->x += dx;
556 img->y += dy;
557
558 img_check_pan(img, true);
559
560 if (ox != img->x || oy != img->y) {
561 img->dirty = true;
562 return true;
563 } else {
564 return false;
565 }
566}
567
568bool img_pan(img_t *img, direction_t dir, int d) {
569 /* d < 0: screen-wise
570 * d = 0: 1/5 of screen
571 * d > 0: num of pixels
572 */
573 float x, y;
574
575 if (img == NULL || img->im == NULL || img->win == NULL)
576 return false;
577
578 if (d > 0) {
579 x = y = MAX(1, (float) d * img->zoom);
580 } else {
581 x = img->win->w / (d < 0 ? 1 : 5);
582 y = img->win->h / (d < 0 ? 1 : 5);
583 }
584
585 switch (dir) {
586 case DIR_LEFT:
587 return img_move(img, x, 0.0);
588 case DIR_RIGHT:
589 return img_move(img, -x, 0.0);
590 case DIR_UP:
591 return img_move(img, 0.0, y);
592 case DIR_DOWN:
593 return img_move(img, 0.0, -y);
594 }
595 return false;
596}
597
598bool img_pan_edge(img_t *img, direction_t dir) {
599 int ox, oy;
600
601 if (img == NULL || img->im == NULL || img->win == NULL)
602 return false;
603
604 ox = img->x;
605 oy = img->y;
606
607 switch (dir) {
608 case DIR_LEFT:
609 img->x = 0;
610 break;
611 case DIR_RIGHT:
612 img->x = img->win->w - img->w * img->zoom;
613 break;
614 case DIR_UP:
615 img->y = 0;
616 break;
617 case DIR_DOWN:
618 img->y = img->win->h - img->h * img->zoom;
619 break;
620 }
621
622 img_check_pan(img, true);
623
624 if (ox != img->x || oy != img->y) {
625 img->dirty = true;
626 return true;
627 } else {
628 return false;
629 }
630}
631
632void img_rotate(img_t *img, int d) {
633 win_t *win;
634 int ox, oy, tmp;
635
636 if (img == NULL || img->im == NULL || img->win == NULL)
637 return;
638
639 win = img->win;
640 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
641 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
642
643 imlib_context_set_image(img->im);
644 imlib_image_orientate(d);
645
646 img->x = oy + (win->w - win->h) / 2;
647 img->y = ox + (win->h - win->w) / 2;
648
649 tmp = img->w;
650 img->w = img->h;
651 img->h = tmp;
652
653 img->checkpan = true;
654 img->dirty = true;
655}
656
657void img_rotate_left(img_t *img) {
658 img_rotate(img, 3);
659}
660
661void img_rotate_right(img_t *img) {
662 img_rotate(img, 1);
663}
664
665void img_flip(img_t *img, flipdir_t d) {
666 if (img == NULL || img->im == NULL)
667 return;
668
669 imlib_context_set_image(img->im);
670
671 switch (d) {
672 case FLIP_HORIZONTAL:
673 imlib_image_flip_horizontal();
674 break;
675 case FLIP_VERTICAL:
676 imlib_image_flip_vertical();
677 break;
678 }
679 img->dirty = true;
680}
681
682void img_toggle_antialias(img_t *img) {
683 if (img == NULL || img->im == NULL)
684 return;
685
686 img->aa = !img->aa;
687 imlib_context_set_image(img->im);
688 imlib_context_set_anti_alias(img->aa);
689 img->dirty = true;
690}
691
692bool img_frame_goto(img_t *img, int n) {
693 if (img == NULL || img->im == NULL)
694 return false;
695 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
696 return false;
697
698 img->multi.sel = n;
699 img->im = img->multi.frames[n].im;
700
701 imlib_context_set_image(img->im);
702 img->w = imlib_image_get_width();
703 img->h = imlib_image_get_height();
704 img->checkpan = true;
705 img->dirty = true;
706
707 return true;
708}
709
710bool img_frame_navigate(img_t *img, int d) {
711 if (img == NULL|| img->im == NULL || img->multi.cnt == 0 || d == 0)
712 return false;
713
714 d += img->multi.sel;
715 if (d < 0)
716 d = 0;
717 else if (d >= img->multi.cnt)
718 d = img->multi.cnt - 1;
719
720 return img_frame_goto(img, d);
721}
722
723bool img_frame_animate(img_t *img, bool restart) {
724 if (img == NULL || img->im == NULL || img->multi.cnt == 0)
725 return false;
726
727 if (img->multi.sel + 1 >= img->multi.cnt) {
728 if (restart || GIF_LOOP) {
729 img_frame_goto(img, 0);
730 } else {
731 img->multi.animate = false;
732 return false;
733 }
734 } else if (!restart) {
735 img_frame_goto(img, img->multi.sel + 1);
736 }
737 img->multi.animate = true;
738 img->dirty = true;
739
740 return true;
741}