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nsxivthumbs.c

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1/* Copyright 2011 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 _THUMBS_CONFIG
21
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <sys/types.h>
26#include <sys/stat.h>
27#include <unistd.h>
28#include <utime.h>
29
30#include "thumbs.h"
31#include "util.h"
32#include "config.h"
33
34#if HAVE_LIBEXIF
35#include <libexif/exif-data.h>
36void exif_auto_orientate(const fileinfo_t*);
37#endif
38
39static const int thumb_dim = THUMB_SIZE + 10;
40
41static char *cache_dir = NULL;
42
43bool tns_cache_enabled(void)
44{
45 struct stat stats;
46
47 return cache_dir != NULL && stat(cache_dir, &stats) == 0 &&
48 S_ISDIR(stats.st_mode) && access(cache_dir, W_OK) == 0;
49}
50
51char* tns_cache_filepath(const char *filepath)
52{
53 size_t len;
54 char *cfile = NULL;
55
56 if (cache_dir == NULL || filepath == NULL || *filepath != '/')
57 return NULL;
58
59 if (strncmp(filepath, cache_dir, strlen(cache_dir)) != 0) {
60 /* don't cache images inside the cache directory! */
61 len = strlen(cache_dir) + strlen(filepath) + 6;
62 cfile = (char*) s_malloc(len);
63 snprintf(cfile, len, "%s/%s.png", cache_dir, filepath + 1);
64 }
65 return cfile;
66}
67
68Imlib_Image tns_cache_load(const char *filepath)
69{
70 char *cfile;
71 struct stat cstats, fstats;
72 Imlib_Image im = NULL;
73
74 if (filepath == NULL)
75 return NULL;
76 if (stat(filepath, &fstats) < 0)
77 return NULL;
78
79 if ((cfile = tns_cache_filepath(filepath)) != NULL) {
80 if (stat(cfile, &cstats) == 0 && cstats.st_mtime == fstats.st_mtime)
81 im = imlib_load_image(cfile);
82 free(cfile);
83 }
84 return im;
85}
86
87void tns_cache_write(thumb_t *t, bool force)
88{
89 char *cfile, *dirend;
90 struct stat cstats, fstats;
91 struct utimbuf times;
92 Imlib_Load_Error err = 0;
93
94 if (t == NULL || t->im == NULL)
95 return;
96 if (t->file == NULL || t->file->name == NULL || t->file->path == NULL)
97 return;
98 if (stat(t->file->path, &fstats) < 0)
99 return;
100
101 if ((cfile = tns_cache_filepath(t->file->path)) != NULL) {
102 if (force || stat(cfile, &cstats) < 0 ||
103 cstats.st_mtime != fstats.st_mtime)
104 {
105 if ((dirend = strrchr(cfile, '/')) != NULL) {
106 *dirend = '\0';
107 err = r_mkdir(cfile);
108 *dirend = '/';
109 }
110
111 if (err == 0) {
112 imlib_context_set_image(t->im);
113 imlib_image_set_format("png");
114 imlib_save_image_with_error_return(cfile, &err);
115 }
116
117 if (err == 0) {
118 times.actime = fstats.st_atime;
119 times.modtime = fstats.st_mtime;
120 utime(cfile, &times);
121 } else {
122 warn("could not cache thumbnail: %s", t->file->name);
123 }
124 }
125 free(cfile);
126 }
127}
128
129void tns_clean_cache(tns_t *tns)
130{
131 int dirlen;
132 bool delete;
133 char *cfile, *filename, *tpos;
134 r_dir_t dir;
135
136 if (cache_dir == NULL)
137 return;
138
139 if (r_opendir(&dir, cache_dir) < 0) {
140 warn("could not open thumbnail cache directory: %s", cache_dir);
141 return;
142 }
143
144 dirlen = strlen(cache_dir);
145
146 while ((cfile = r_readdir(&dir)) != NULL) {
147 filename = cfile + dirlen;
148 delete = false;
149
150 if ((tpos = strrchr(filename, '.')) != NULL) {
151 *tpos = '\0';
152 if (access(filename, F_OK) < 0)
153 delete = true;
154 *tpos = '.';
155 }
156 if (delete) {
157 if (unlink(cfile) < 0)
158 warn("could not delete cache file: %s", cfile);
159 }
160 free(cfile);
161 }
162 r_closedir(&dir);
163}
164
165
166void tns_init(tns_t *tns, int cnt, win_t *win)
167{
168 int len;
169 const char *homedir, *dsuffix = "";
170
171 if (tns == NULL)
172 return;
173
174 if (cnt > 0) {
175 tns->thumbs = (thumb_t*) s_malloc(cnt * sizeof(thumb_t));
176 memset(tns->thumbs, 0, cnt * sizeof(thumb_t));
177 } else {
178 tns->thumbs = NULL;
179 }
180
181 tns->cap = cnt;
182 tns->cnt = tns->first = tns->sel = 0;
183 tns->win = win;
184 tns->dirty = false;
185
186 if ((homedir = getenv("XDG_CACHE_HOME")) == NULL || homedir[0] == '\0') {
187 homedir = getenv("HOME");
188 dsuffix = "/.cache";
189 }
190 if (homedir != NULL) {
191 if (cache_dir != NULL)
192 free(cache_dir);
193 len = strlen(homedir) + strlen(dsuffix) + 6;
194 cache_dir = (char*) s_malloc(len);
195 snprintf(cache_dir, len, "%s%s/sxiv", homedir, dsuffix);
196 } else {
197 warn("could not locate thumbnail cache directory");
198 }
199}
200
201void tns_free(tns_t *tns)
202{
203 int i;
204
205 if (tns == NULL)
206 return;
207
208 if (tns->thumbs != NULL) {
209 for (i = 0; i < tns->cnt; i++) {
210 if (tns->thumbs[i].im != NULL) {
211 imlib_context_set_image(tns->thumbs[i].im);
212 imlib_free_image();
213 }
214 }
215 free(tns->thumbs);
216 tns->thumbs = NULL;
217 }
218
219 if (cache_dir != NULL) {
220 free(cache_dir);
221 cache_dir = NULL;
222 }
223}
224
225bool tns_load(tns_t *tns, int n, const fileinfo_t *file,
226 bool force, bool silent)
227{
228 int w, h;
229 bool use_cache, cache_hit = false;
230 float z, zw, zh;
231 thumb_t *t;
232 Imlib_Image im = NULL;
233
234 if (tns == NULL || tns->thumbs == NULL)
235 return false;
236 if (file == NULL || file->name == NULL || file->path == NULL)
237 return false;
238 if (n < 0 || n >= tns->cap)
239 return false;
240
241 t = &tns->thumbs[n];
242 t->file = file;
243
244 if (t->im != NULL) {
245 imlib_context_set_image(t->im);
246 imlib_free_image();
247 }
248
249 if ((use_cache = tns_cache_enabled())) {
250 if (!force && (im = tns_cache_load(file->path)) != NULL)
251 cache_hit = true;
252 }
253
254 if (!cache_hit) {
255#if HAVE_LIBEXIF
256 int pw = 0, ph = 0, x = 0, y = 0;
257 bool err;
258 ExifData *ed;
259 ExifEntry *entry;
260 ExifContent *ifd;
261 ExifByteOrder byte_order;
262 int tmpfd;
263 char tmppath[] = "/tmp/sxiv-XXXXXX";
264 Imlib_Image tmpim;
265
266 if ((ed = exif_data_new_from_file(file->path)) != NULL &&
267 ed->data != NULL && ed->size > 0)
268 {
269 if ((tmpfd = mkstemp(tmppath)) >= 0) {
270 err = write(tmpfd, ed->data, ed->size) != ed->size;
271 close(tmpfd);
272
273 if (!err && (tmpim = imlib_load_image(tmppath)) != NULL) {
274 byte_order = exif_data_get_byte_order(ed);
275 ifd = ed->ifd[EXIF_IFD_EXIF];
276 entry = exif_content_get_entry(ifd, EXIF_TAG_PIXEL_X_DIMENSION);
277 if (entry != NULL)
278 pw = exif_get_long(entry->data, byte_order);
279 entry = exif_content_get_entry(ifd, EXIF_TAG_PIXEL_Y_DIMENSION);
280 if (entry != NULL)
281 ph = exif_get_long(entry->data, byte_order);
282
283 imlib_context_set_image(tmpim);
284 w = imlib_image_get_width();
285 h = imlib_image_get_height();
286
287 if (pw > w && ph > h && (pw - ph >= 0) == (w - h >= 0)) {
288 zw = (float) pw / (float) w;
289 zh = (float) ph / (float) h;
290 if (zw < zh) {
291 pw /= zh;
292 x = (w - pw) / 2;
293 w = pw;
294 } else if (zw > zh) {
295 ph /= zw;
296 y = (h - ph) / 2;
297 h = ph;
298 }
299 }
300 if ((im = imlib_create_cropped_image(x, y, w, h)) == NULL)
301 die("could not allocate memory");
302 imlib_free_image_and_decache();
303 }
304 unlink(tmppath);
305 }
306 exif_data_unref(ed);
307 }
308#endif
309 if (im == NULL && (access(file->path, R_OK) < 0 ||
310 (im = imlib_load_image(file->path)) == NULL))
311 {
312 if (!silent)
313 warn("could not open image: %s", file->name);
314 return false;
315 }
316 }
317 imlib_context_set_image(im);
318 imlib_context_set_anti_alias(1);
319
320#if HAVE_LIBEXIF
321 if (!cache_hit)
322 exif_auto_orientate(file);
323#endif
324
325 w = imlib_image_get_width();
326 h = imlib_image_get_height();
327 zw = (float) THUMB_SIZE / (float) w;
328 zh = (float) THUMB_SIZE / (float) h;
329 z = MIN(zw, zh);
330 z = MIN(z, 1.0);
331 t->w = z * w;
332 t->h = z * h;
333
334 t->im = imlib_create_cropped_scaled_image(0, 0, w, h, t->w, t->h);
335 if (t->im == NULL)
336 die("could not allocate memory");
337
338 imlib_free_image_and_decache();
339
340 if (use_cache && !cache_hit)
341 tns_cache_write(t, true);
342
343 tns->dirty = true;
344 return true;
345}
346
347void tns_check_view(tns_t *tns, bool scrolled)
348{
349 int r;
350
351 if (tns == NULL)
352 return;
353
354 tns->first -= tns->first % tns->cols;
355 r = tns->sel % tns->cols;
356
357 if (scrolled) {
358 /* move selection into visible area */
359 if (tns->sel >= tns->first + tns->cols * tns->rows)
360 tns->sel = tns->first + r + tns->cols * (tns->rows - 1);
361 else if (tns->sel < tns->first)
362 tns->sel = tns->first + r;
363 } else {
364 /* scroll to selection */
365 if (tns->first + tns->cols * tns->rows <= tns->sel) {
366 tns->first = tns->sel - r - tns->cols * (tns->rows - 1);
367 tns->dirty = true;
368 } else if (tns->first > tns->sel) {
369 tns->first = tns->sel - r;
370 tns->dirty = true;
371 }
372 }
373}
374
375void tns_render(tns_t *tns)
376{
377 thumb_t *t;
378 win_t *win;
379 int i, cnt, r, x, y;
380
381 if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
382 return;
383 if (!tns->dirty)
384 return;
385
386 win = tns->win;
387 win_clear(win);
388 imlib_context_set_drawable(win->pm);
389
390 tns->cols = MAX(1, win->w / thumb_dim);
391 tns->rows = MAX(1, win->h / thumb_dim);
392
393 if (tns->cnt < tns->cols * tns->rows) {
394 tns->first = 0;
395 cnt = tns->cnt;
396 } else {
397 tns_check_view(tns, false);
398 cnt = tns->cols * tns->rows;
399 if ((r = tns->first + cnt - tns->cnt) >= tns->cols)
400 tns->first -= r - r % tns->cols;
401 if (r > 0)
402 cnt -= r % tns->cols;
403 }
404
405 r = cnt % tns->cols ? 1 : 0;
406 tns->x = x = (win->w - MIN(cnt, tns->cols) * thumb_dim) / 2 + 5;
407 tns->y = y = (win->h - (cnt / tns->cols + r) * thumb_dim) / 2 + 5;
408
409 for (i = 0; i < cnt; i++) {
410 t = &tns->thumbs[tns->first + i];
411 t->x = x + (THUMB_SIZE - t->w) / 2;
412 t->y = y + (THUMB_SIZE - t->h) / 2;
413 imlib_context_set_image(t->im);
414 imlib_render_image_part_on_drawable_at_size(0, 0, t->w, t->h,
415 t->x, t->y, t->w, t->h);
416 if (t->file->marked)
417 tns_mark(tns, tns->first + i, true);
418 if ((i + 1) % tns->cols == 0) {
419 x = tns->x;
420 y += thumb_dim;
421 } else {
422 x += thumb_dim;
423 }
424 }
425 tns->dirty = false;
426 tns_highlight(tns, tns->sel, true);
427}
428
429void tns_mark(tns_t *tns, int n, bool mark)
430{
431 if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
432 return;
433
434 if (n >= 0 && n < tns->cnt) {
435 unsigned long col;
436 thumb_t *t = &tns->thumbs[n];
437 win_t *win = tns->win;
438 int x = t->x, y = t->y, w = t->w, h = t->h;
439
440 if (mark || n == tns->sel)
441 col = win->selcol;
442 else if (win->fullscreen)
443 col = win->fscol;
444 else
445 col = win->bgcol;
446
447 win_draw_rect(win, win->pm, x - 4, y - 4, 8, 2, true, 0, col);
448 win_draw_rect(win, win->pm, x - 4, y - 4, 2, 8, true, 0, col);
449 win_draw_rect(win, win->pm, x + w - 4, y - 4, 8, 2, true, 0, col);
450 win_draw_rect(win, win->pm, x + w + 2, y - 4, 2, 8, true, 0, col);
451 win_draw_rect(win, win->pm, x - 4, y + h + 2, 8, 2, true, 0, col);
452 win_draw_rect(win, win->pm, x - 4, y + h - 4, 2, 8, true, 0, col);
453 win_draw_rect(win, win->pm, x + w - 4, y + h + 2, 8, 2, true, 0, col);
454 win_draw_rect(win, win->pm, x + w + 2, y + h - 4, 2, 8, true, 0, col);
455 }
456}
457
458void tns_highlight(tns_t *tns, int n, bool hl)
459{
460 if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
461 return;
462
463 if (n >= 0 && n < tns->cnt) {
464 unsigned long col;
465 thumb_t *t = &tns->thumbs[n];
466 win_t *win = tns->win;
467
468 if (hl)
469 col = win->selcol;
470 else if (win->fullscreen)
471 col = win->fscol;
472 else
473 col = win->bgcol;
474
475 win_draw_rect(win, win->pm, t->x - 3, t->y - 3, t->w + 6, t->h + 6,
476 false, 2, col);
477
478 if (!hl && t->file->marked)
479 tns_mark(tns, n, true);
480 }
481}
482
483bool tns_move_selection(tns_t *tns, direction_t dir, int cnt)
484{
485 int old, max;
486
487 if (tns == NULL || tns->thumbs == NULL)
488 return false;
489
490 old = tns->sel;
491 cnt = cnt > 1 ? cnt : 1;
492
493 switch (dir) {
494 case DIR_UP:
495 tns->sel = MAX(tns->sel - cnt * tns->cols, tns->sel % tns->cols);
496 break;
497 case DIR_DOWN:
498 max = tns->cols * ((tns->cnt - 1) / tns->cols) +
499 MIN((tns->cnt - 1) % tns->cols, tns->sel % tns->cols);
500 tns->sel = MIN(tns->sel + cnt * tns->cols, max);
501 break;
502 case DIR_LEFT:
503 tns->sel = MAX(tns->sel - cnt, 0);
504 break;
505 case DIR_RIGHT:
506 tns->sel = MIN(tns->sel + cnt, tns->cnt - 1);
507 break;
508 }
509
510 if (tns->sel != old) {
511 tns_highlight(tns, old, false);
512 tns_check_view(tns, false);
513 if (!tns->dirty)
514 tns_highlight(tns, tns->sel, true);
515 }
516 return tns->sel != old;
517}
518
519bool tns_scroll(tns_t *tns, direction_t dir, bool screen)
520{
521 int d, max, old;
522
523 if (tns == NULL)
524 return false;
525
526 old = tns->first;
527 d = tns->cols * (screen ? tns->rows : 1);
528
529 if (dir == DIR_DOWN) {
530 max = tns->cnt - tns->cols * tns->rows;
531 if (tns->cnt % tns->cols != 0)
532 max += tns->cols - tns->cnt % tns->cols;
533 tns->first = MIN(tns->first + d, max);
534 } else if (dir == DIR_UP) {
535 tns->first = MAX(tns->first - d, 0);
536 }
537
538 if (tns->first != old) {
539 tns_check_view(tns, true);
540 tns->dirty = true;
541 }
542 return tns->first != old;
543}
544
545int tns_translate(tns_t *tns, int x, int y)
546{
547 int n;
548
549 if (tns == NULL || tns->thumbs == NULL)
550 return -1;
551 if (x < tns->x || y < tns->y)
552 return -1;
553
554 n = tns->first + (y - tns->y) / thumb_dim * tns->cols +
555 (x - tns->x) / thumb_dim;
556 if (n >= tns->cnt)
557 n = -1;
558
559 return n;
560}