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nsxivimage.c

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1/* sxiv: image.c
2 * Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
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#include <unistd.h>
20
21#ifdef HAVE_GIFLIB
22#include <stdlib.h>
23#include <string.h>
24#include <sys/types.h>
25#include <gif_lib.h>
26#endif
27
28#include "image.h"
29#include "options.h"
30#include "util.h"
31
32#define _IMAGE_CONFIG
33#include "config.h"
34
35enum { MIN_GIF_DELAY = 50 };
36
37float zoom_min;
38float zoom_max;
39
40void img_init(img_t *img, win_t *win) {
41 zoom_min = zoom_levels[0] / 100.0;
42 zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
43
44 if (img) {
45 img->im = NULL;
46 img->multi.cap = img->multi.cnt = 0;
47 img->multi.animate = 0;
48 img->zoom = options->zoom;
49 img->zoom = MAX(img->zoom, zoom_min);
50 img->zoom = MIN(img->zoom, zoom_max);
51 img->aa = options->aa;
52 img->alpha = 1;
53 }
54
55 if (win) {
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}
61
62#ifdef HAVE_GIFLIB
63/* Originally based on, but in its current form merely inspired by Imlib2's
64 * src/modules/loaders/loader_gif.c:load(), written by Carsten Haitzler.
65 */
66int img_load_gif(img_t *img, const fileinfo_t *file) {
67 GifFileType *gif;
68 GifRowType *rows = NULL;
69 GifRecordType rec;
70 ColorMapObject *cmap;
71 DATA32 bgpixel, *data, *ptr;
72 DATA32 *prev_frame = NULL;
73 Imlib_Image *im;
74 int i, j, bg, r, g, b;
75 int x, y, w, h, sw, sh;
76 int intoffset[] = { 0, 4, 2, 1 };
77 int intjump[] = { 8, 8, 4, 2 };
78 int err = 0, transp = -1;
79 unsigned int delay = 0;
80
81 if (img->multi.cap == 0) {
82 img->multi.cap = 8;
83 img->multi.frames = (img_frame_t*)
84 s_malloc(sizeof(img_frame_t) * img->multi.cap);
85 }
86 img->multi.cnt = 0;
87 img->multi.sel = 0;
88
89 gif = DGifOpenFileName(file->path);
90 if (!gif) {
91 warn("could not open gif file: %s", file->name);
92 return 0;
93 }
94 bg = gif->SBackGroundColor;
95 sw = gif->SWidth;
96 sh = gif->SHeight;
97
98 do {
99 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
100 err = 1;
101 break;
102 }
103 if (rec == EXTENSION_RECORD_TYPE) {
104 int ext_code;
105 GifByteType *ext = NULL;
106
107 DGifGetExtension(gif, &ext_code, &ext);
108 while (ext) {
109 if (ext_code == 0xf9) {
110 if (ext[1] & 1)
111 transp = (int) ext[4];
112 else
113 transp = -1;
114
115 delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
116 if (delay)
117 delay = MAX(delay, MIN_GIF_DELAY);
118 }
119 ext = NULL;
120 DGifGetExtensionNext(gif, &ext);
121 }
122 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
123 if (DGifGetImageDesc(gif) == GIF_ERROR) {
124 err = 1;
125 break;
126 }
127 x = gif->Image.Left;
128 y = gif->Image.Top;
129 w = gif->Image.Width;
130 h = gif->Image.Height;
131
132 rows = (GifRowType*) s_malloc(h * sizeof(GifRowType));
133 for (i = 0; i < h; i++)
134 rows[i] = (GifRowType) s_malloc(w * sizeof(GifPixelType));
135 if (gif->Image.Interlace) {
136 for (i = 0; i < 4; i++) {
137 for (j = intoffset[i]; j < h; j += intjump[i])
138 DGifGetLine(gif, rows[j], w);
139 }
140 } else {
141 for (i = 0; i < h; i++)
142 DGifGetLine(gif, rows[i], w);
143 }
144
145 ptr = data = (DATA32*) s_malloc(sizeof(DATA32) * sw * sh);
146 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
147 r = cmap->Colors[bg].Red;
148 g = cmap->Colors[bg].Green;
149 b = cmap->Colors[bg].Blue;
150 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
151
152 for (i = 0; i < sh; i++) {
153 for (j = 0; j < sw; j++) {
154 if (i < y || i >= y + h || j < x || j >= x + w) {
155 if (transp >= 0 && prev_frame)
156 *ptr = prev_frame[i * sw + j];
157 else
158 *ptr = bgpixel;
159 } else if (rows[i-y][j-x] == transp) {
160 if (prev_frame)
161 *ptr = prev_frame[i * sw + j];
162 else
163 *ptr = bgpixel;
164 } else {
165 r = cmap->Colors[rows[i-y][j-x]].Red;
166 g = cmap->Colors[rows[i-y][j-x]].Green;
167 b = cmap->Colors[rows[i-y][j-x]].Blue;
168 *ptr = 0xff << 24 | r << 16 | g << 8 | b;
169 }
170 ptr++;
171 }
172 }
173
174 im = imlib_create_image_using_copied_data(sw, sh, data);
175
176 for (i = 0; i < h; i++)
177 free(rows[i]);
178 free(rows);
179 free(data);
180
181 if (!im) {
182 err = 1;
183 break;
184 }
185
186 imlib_context_set_image(im);
187 prev_frame = imlib_image_get_data_for_reading_only();
188
189 imlib_image_set_format("gif");
190 if (transp >= 0)
191 imlib_image_set_has_alpha(1);
192
193 if (img->multi.cnt == img->multi.cap) {
194 img->multi.cap *= 2;
195 img->multi.frames = (img_frame_t*)
196 s_realloc(img->multi.frames,
197 img->multi.cap * sizeof(img_frame_t));
198 }
199 img->multi.frames[img->multi.cnt].im = im;
200 img->multi.frames[img->multi.cnt].delay = delay ? delay : GIF_DELAY;
201 img->multi.cnt++;
202 }
203 } while (rec != TERMINATE_RECORD_TYPE);
204
205 DGifCloseFile(gif);
206
207 if (err && !file->loaded)
208 warn("corrupted gif file: %s", file->name);
209
210 if (img->multi.cnt > 1) {
211 imlib_context_set_image(img->im);
212 imlib_free_image();
213 img->im = img->multi.frames[0].im;
214 img->multi.animate = GIF_AUTOPLAY;
215 } else if (img->multi.cnt == 1) {
216 imlib_context_set_image(img->multi.frames[0].im);
217 imlib_free_image();
218 img->multi.cnt = 0;
219 img->multi.animate = 0;
220 }
221
222 imlib_context_set_image(img->im);
223
224 return !err;
225}
226#endif /* HAVE_GIFLIB */
227
228int img_load(img_t *img, const fileinfo_t *file) {
229 const char *fmt;
230
231 if (!img || !file || !file->name || !file->path)
232 return 0;
233
234 if (access(file->path, R_OK) || !(img->im = imlib_load_image(file->path))) {
235 warn("could not open image: %s", file->name);
236 return 0;
237 }
238
239 imlib_context_set_image(img->im);
240 imlib_image_set_changes_on_disk();
241 imlib_context_set_anti_alias(img->aa);
242
243 fmt = imlib_image_format();
244#ifdef HAVE_GIFLIB
245 if (!strcmp(fmt, "gif"))
246 img_load_gif(img, file);
247#else
248 /* avoid unused-but-set-variable warning */
249 (void) fmt;
250#endif
251
252 img->scalemode = options->scalemode;
253 img->re = 0;
254 img->checkpan = 0;
255
256 img->w = imlib_image_get_width();
257 img->h = imlib_image_get_height();
258
259 return 1;
260}
261
262void img_close(img_t *img, int decache) {
263 int i;
264
265 if (!img)
266 return;
267
268 if (img->multi.cnt) {
269 for (i = 0; i < img->multi.cnt; i++) {
270 imlib_context_set_image(img->multi.frames[i].im);
271 imlib_free_image();
272 }
273 img->multi.cnt = 0;
274 img->im = NULL;
275 } else if (img->im) {
276 imlib_context_set_image(img->im);
277 if (decache)
278 imlib_free_image_and_decache();
279 else
280 imlib_free_image();
281 img->im = NULL;
282 }
283}
284
285void img_check_pan(img_t *img, win_t *win) {
286 if (!img || !win)
287 return;
288
289 if (img->w * img->zoom > win->w) {
290 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
291 img->x = 0;
292 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
293 img->x = win->w - img->w * img->zoom;
294 } else {
295 img->x = (win->w - img->w * img->zoom) / 2;
296 }
297 if (img->h * img->zoom > win->h) {
298 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
299 img->y = 0;
300 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
301 img->y = win->h - img->h * img->zoom;
302 } else {
303 img->y = (win->h - img->h * img->zoom) / 2;
304 }
305}
306
307int img_fit(img_t *img, win_t *win) {
308 float oz, zw, zh;
309
310 if (!img || !win)
311 return 0;
312
313 oz = img->zoom;
314 zw = (float) win->w / (float) img->w;
315 zh = (float) win->h / (float) img->h;
316
317 img->zoom = MIN(zw, zh);
318 img->zoom = MAX(img->zoom, zoom_min);
319 img->zoom = MIN(img->zoom, zoom_max);
320
321 return oz != img->zoom;
322}
323
324void img_render(img_t *img, win_t *win) {
325 int sx, sy, sw, sh;
326 int dx, dy, dw, dh;
327
328 if (!img || !img->im || !win)
329 return;
330
331 if (img->scalemode != SCALE_ZOOM) {
332 img_fit(img, win);
333 if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
334 img->zoom = 1.0;
335 }
336
337 if (!img->re) {
338 /* rendered for the first time */
339 img->re = 1;
340 if (img->zoom * img->w <= win->w)
341 img->x = (win->w - img->w * img->zoom) / 2;
342 else
343 img->x = 0;
344 if (img->zoom * img->h <= win->h)
345 img->y = (win->h - img->h * img->zoom) / 2;
346 else
347 img->y = 0;
348 }
349
350 if (img->checkpan) {
351 img_check_pan(img, win);
352 img->checkpan = 0;
353 }
354
355 /* calculate source and destination offsets */
356 if (img->x < 0) {
357 sx = -img->x / img->zoom;
358 sw = win->w / img->zoom;
359 dx = 0;
360 dw = win->w;
361 } else {
362 sx = 0;
363 sw = img->w;
364 dx = img->x;
365 dw = img->w * img->zoom;
366 }
367 if (img->y < 0) {
368 sy = -img->y / img->zoom;
369 sh = win->h / img->zoom;
370 dy = 0;
371 dh = win->h;
372 } else {
373 sy = 0;
374 sh = img->h;
375 dy = img->y;
376 dh = img->h * img->zoom;
377 }
378
379 win_clear(win);
380
381 imlib_context_set_image(img->im);
382
383 if (imlib_image_has_alpha() && !img->alpha)
384 win_draw_rect(win, win->pm, dx, dy, dw, dh, True, 0, win->white);
385
386 imlib_context_set_drawable(win->pm);
387 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
388
389 win_draw(win);
390}
391
392int img_fit_win(img_t *img, win_t *win) {
393 if (!img || !img->im || !win)
394 return 0;
395
396 img->scalemode = SCALE_FIT;
397 return img_fit(img, win);
398}
399
400int img_center(img_t *img, win_t *win) {
401 int ox, oy;
402
403 if (!img || !win)
404 return 0;
405
406 ox = img->x;
407 oy = img->y;
408
409 img->x = (win->w - img->w * img->zoom) / 2;
410 img->y = (win->h - img->h * img->zoom) / 2;
411
412 return ox != img->x || oy != img->y;
413}
414
415int img_zoom(img_t *img, win_t *win, float z) {
416 if (!img || !img->im || !win)
417 return 0;
418
419 z = MAX(z, zoom_min);
420 z = MIN(z, zoom_max);
421
422 img->scalemode = SCALE_ZOOM;
423
424 if (z != img->zoom) {
425 img->x = win->w / 2 - (win->w / 2 - img->x) * z / img->zoom;
426 img->y = win->h / 2 - (win->h / 2 - img->y) * z / img->zoom;
427 img->zoom = z;
428 img->checkpan = 1;
429 return 1;
430 } else {
431 return 0;
432 }
433}
434
435int img_zoom_in(img_t *img, win_t *win) {
436 int i;
437
438 if (!img || !img->im || !win)
439 return 0;
440
441 for (i = 1; i < ARRLEN(zoom_levels); i++) {
442 if (zoom_levels[i] > img->zoom * 100.0)
443 return img_zoom(img, win, zoom_levels[i] / 100.0);
444 }
445 return 0;
446}
447
448int img_zoom_out(img_t *img, win_t *win) {
449 int i;
450
451 if (!img || !img->im || !win)
452 return 0;
453
454 for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
455 if (zoom_levels[i] < img->zoom * 100.0)
456 return img_zoom(img, win, zoom_levels[i] / 100.0);
457 }
458 return 0;
459}
460
461int img_move(img_t *img, win_t *win, int dx, int dy) {
462 int ox, oy;
463
464 if (!img || !img->im || !win)
465 return 0;
466
467 ox = img->x;
468 oy = img->y;
469
470 img->x += dx;
471 img->y += dy;
472
473 img_check_pan(img, win);
474
475 return ox != img->x || oy != img->y;
476}
477
478int img_pan(img_t *img, win_t *win, direction_t dir, int screen) {
479 if (!img || !img->im || !win)
480 return 0;
481
482 switch (dir) {
483 case DIR_LEFT:
484 return img_move(img, win, win->w / (screen ? 1 : 5), 0);
485 case DIR_RIGHT:
486 return img_move(img, win, win->w / (screen ? 1 : 5) * -1, 0);
487 case DIR_UP:
488 return img_move(img, win, 0, win->h / (screen ? 1 : 5));
489 case DIR_DOWN:
490 return img_move(img, win, 0, win->h / (screen ? 1 : 5) * -1);
491 }
492
493 return 0;
494}
495
496int img_pan_edge(img_t *img, win_t *win, direction_t dir) {
497 int ox, oy;
498
499 if (!img || !img->im || !win)
500 return 0;
501
502 ox = img->x;
503 oy = img->y;
504
505 switch (dir) {
506 case DIR_LEFT:
507 img->x = 0;
508 break;
509 case DIR_RIGHT:
510 img->x = win->w - img->w * img->zoom;
511 break;
512 case DIR_UP:
513 img->y = 0;
514 break;
515 case DIR_DOWN:
516 img->y = win->h - img->h * img->zoom;
517 break;
518 }
519
520 img_check_pan(img, win);
521
522 return ox != img->x || oy != img->y;
523}
524
525void img_rotate(img_t *img, win_t *win, int d) {
526 int ox, oy, tmp;
527
528 if (!img || !img->im || !win)
529 return;
530
531 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
532 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
533
534 imlib_context_set_image(img->im);
535 imlib_image_orientate(d);
536
537 img->x = oy + (win->w - win->h) / 2;
538 img->y = ox + (win->h - win->w) / 2;
539
540 tmp = img->w;
541 img->w = img->h;
542 img->h = tmp;
543
544 img->checkpan = 1;
545}
546
547void img_rotate_left(img_t *img, win_t *win) {
548 img_rotate(img, win, 3);
549}
550
551void img_rotate_right(img_t *img, win_t *win) {
552 img_rotate(img, win, 1);
553}
554
555void img_toggle_antialias(img_t *img) {
556 if (img && img->im) {
557 img->aa ^= 1;
558 imlib_context_set_image(img->im);
559 imlib_context_set_anti_alias(img->aa);
560 }
561}
562
563int img_frame_goto(img_t *img, int n) {
564 if (!img || n < 0 || n >= img->multi.cnt)
565 return 0;
566
567 if (n == img->multi.sel)
568 return 0;
569
570 img->multi.sel = n;
571 img->im = img->multi.frames[n].im;
572
573 imlib_context_set_image(img->im);
574 img->w = imlib_image_get_width();
575 img->h = imlib_image_get_height();
576 img->checkpan = 1;
577
578 return 1;
579}
580
581int img_frame_navigate(img_t *img, int d) {
582 if (!img || !img->multi.cnt || !d)
583 return 0;
584
585 d += img->multi.sel;
586 if (d < 0)
587 d = 0;
588 else if (d >= img->multi.cnt)
589 d = img->multi.cnt - 1;
590
591 return img_frame_goto(img, d);
592}
593
594int img_frame_animate(img_t *img, int restart) {
595 if (!img || !img->multi.cnt)
596 return 0;
597
598 if (img->multi.sel + 1 >= img->multi.cnt) {
599 if (restart || GIF_LOOP) {
600 img_frame_goto(img, 0);
601 } else {
602 img->multi.animate = 0;
603 return 0;
604 }
605 } else if (!restart) {
606 img_frame_goto(img, img->multi.sel + 1);
607 }
608
609 img->multi.animate = 1;
610
611 return img->multi.frames[img->multi.sel].delay;
612}