nsxiv/thumbs.c

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/* sxiv: thumbs.c
* Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "config.h"
#include "thumbs.h"
#include "util.h"
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extern Imlib_Image *im_invalid;
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const int thumb_dim = THUMB_SIZE + 10;
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char *cache_dir = NULL;
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int tns_cache_enabled();
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Imlib_Image* tns_cache_load(const char*);
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void tns_cache_write(thumb_t*, Bool);
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void tns_init(tns_t *tns, int cnt) {
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int len;
char *homedir;
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if (!tns)
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return;
tns->cnt = tns->first = tns->sel = 0;
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tns->thumbs = (thumb_t*) s_malloc(cnt * sizeof(thumb_t));
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memset(tns->thumbs, 0, cnt * sizeof(thumb_t));
tns->cap = cnt;
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tns->dirty = 0;
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if ((homedir = getenv("HOME"))) {
if (cache_dir)
free(cache_dir);
len = strlen(homedir) + 10;
cache_dir = (char*) s_malloc(len * sizeof(char));
snprintf(cache_dir, len, "%s/.sxiv", homedir);
}
}
void tns_free(tns_t *tns, win_t *win) {
int i;
if (!tns || !tns->thumbs)
return;
for (i = 0; i < tns->cnt; ++i) {
if (tns->thumbs[i].im) {
imlib_context_set_image(tns->thumbs[i].im);
imlib_free_image();
}
}
free(tns->thumbs);
tns->thumbs = NULL;
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if (cache_dir) {
free(cache_dir);
cache_dir = NULL;
}
}
void tns_load(tns_t *tns, win_t *win, int n, const char *filename) {
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int w, h;
int use_cache, cached = 0;
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float z, zw, zh;
thumb_t *t;
Imlib_Image *im;
if (!tns || !win || !filename)
return;
if (n >= tns->cap)
return;
else if (n >= tns->cnt)
tns->cnt = n + 1;
t = &tns->thumbs[n];
if (t->im) {
imlib_context_set_image(t->im);
imlib_free_image();
}
if ((use_cache = tns_cache_enabled())) {
if ((im = tns_cache_load(filename)))
cached = 1;
}
if (cached || (im = imlib_load_image(filename)))
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imlib_context_set_image(im);
else
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imlib_context_set_image(im_invalid);
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w = imlib_image_get_width();
h = imlib_image_get_height();
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if (im) {
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t->filename = filename;
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zw = (float) THUMB_SIZE / (float) w;
zh = (float) THUMB_SIZE / (float) h;
z = MIN(zw, zh);
} else {
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t->filename = NULL;
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z = 1.0;
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}
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t->w = z * w;
t->h = z * h;
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imlib_context_set_anti_alias(1);
if (!(t->im = imlib_create_cropped_scaled_image(0, 0, w, h, t->w, t->h)))
die("could not allocate memory");
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if (im)
imlib_free_image_and_decache();
if (use_cache && !cached)
tns_cache_write(t, False);
tns->dirty = 1;
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}
void tns_check_view(tns_t *tns, Bool scrolled) {
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int r;
if (!tns)
return;
tns->first -= tns->first % tns->cols;
r = tns->sel % tns->cols;
if (scrolled) {
/* move selection into visible area */
if (tns->sel >= tns->first + tns->cols * tns->rows)
tns->sel = tns->first + r + tns->cols * (tns->rows - 1);
else if (tns->sel < tns->first)
tns->sel = tns->first + r;
} else {
/* scroll to selection */
if (tns->first + tns->cols * tns->rows <= tns->sel) {
tns->first = tns->sel - r - tns->cols * (tns->rows - 1);
tns->dirty = 1;
} else if (tns->first > tns->sel) {
tns->first = tns->sel - r;
tns->dirty = 1;
}
}
}
void tns_render(tns_t *tns, win_t *win) {
int i, cnt, r, x, y;
thumb_t *t;
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if (!tns || !tns->dirty || !win)
return;
win_clear(win);
imlib_context_set_drawable(win->pm);
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tns->cols = MAX(1, win->w / thumb_dim);
tns->rows = MAX(1, win->h / thumb_dim);
if (tns->cnt < tns->cols * tns->rows) {
tns->first = 0;
cnt = tns->cnt;
} else {
tns_check_view(tns, False);
cnt = tns->cols * tns->rows;
if ((r = tns->first + cnt - tns->cnt) >= tns->cols)
tns->first -= r - r % tns->cols;
if (r > 0)
cnt -= r % tns->cols;
}
r = cnt % tns->cols ? 1 : 0;
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tns->x = x = (win->w - MIN(cnt, tns->cols) * thumb_dim) / 2 + 5;
tns->y = y = (win->h - (cnt / tns->cols + r) * thumb_dim) / 2 + 5;
for (i = 0; i < cnt; ++i) {
t = &tns->thumbs[tns->first + i];
t->x = x + (THUMB_SIZE - t->w) / 2;
t->y = y + (THUMB_SIZE - t->h) / 2;
imlib_context_set_image(t->im);
imlib_render_image_part_on_drawable_at_size(0, 0, t->w, t->h,
t->x, t->y, t->w, t->h);
if ((i + 1) % tns->cols == 0) {
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x = tns->x;
y += thumb_dim;
} else {
x += thumb_dim;
}
}
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tns->dirty = 0;
tns_highlight(tns, win, tns->sel, True);
}
void tns_highlight(tns_t *tns, win_t *win, int n, Bool hl) {
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thumb_t *t;
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unsigned long col;
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if (!tns || !win)
return;
if (n >= 0 && n < tns->cnt) {
t = &tns->thumbs[n];
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if (hl)
col = win->selcol;
else if (win->fullscreen)
col = win->black;
else
col = win->bgcol;
win_draw_rect(win, win->pm, t->x - 2, t->y - 2, t->w + 4, t->h + 4,
False, 2, col);
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}
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win_draw(win);
}
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int tns_move_selection(tns_t *tns, win_t *win, tnsdir_t dir) {
int old;
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if (!tns || !win)
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return 0;
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old = tns->sel;
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switch (dir) {
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case TNS_LEFT:
if (tns->sel > 0)
--tns->sel;
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break;
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case TNS_RIGHT:
if (tns->sel < tns->cnt - 1)
++tns->sel;
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break;
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case TNS_UP:
if (tns->sel >= tns->cols)
tns->sel -= tns->cols;
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break;
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case TNS_DOWN:
if (tns->sel + tns->cols < tns->cnt)
tns->sel += tns->cols;
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break;
}
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if (tns->sel != old) {
tns_highlight(tns, win, old, False);
tns_check_view(tns, False);
if (!tns->dirty)
tns_highlight(tns, win, tns->sel, True);
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}
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return tns->sel != old;
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}
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int tns_scroll(tns_t *tns, tnsdir_t dir) {
int old;
if (!tns)
return 0;
old = tns->first;
if (dir == TNS_DOWN && tns->first + tns->cols * tns->rows < tns->cnt) {
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tns->first += tns->cols;
tns_check_view(tns, True);
tns->dirty = 1;
} else if (dir == TNS_UP && tns->first >= tns->cols) {
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tns->first -= tns->cols;
tns_check_view(tns, True);
tns->dirty = 1;
}
return tns->first != old;
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}
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int tns_translate(tns_t *tns, int x, int y) {
int n;
thumb_t *t;
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if (!tns || x < tns->x || y < tns->y)
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return -1;
n = tns->first + (y - tns->y) / thumb_dim * tns->cols +
(x - tns->x) / thumb_dim;
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if (n < tns->cnt) {
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t = &tns->thumbs[n];
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if (x >= t->x && x <= t->x + t->w && y >= t->y && y <= t->y + t->h)
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return n;
}
return -1;
}
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/* thumbnail caching */
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int tns_cache_enabled() {
struct stat stats;
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return cache_dir && !stat(cache_dir, &stats) && S_ISDIR(stats.st_mode) &&
!access(cache_dir, W_OK);
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}
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char* tns_cache_filename(const char *filename) {
size_t len;
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char *cfile, *abspath;
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if (!cache_dir || !filename)
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return NULL;
if (*filename != '/') {
if (!(abspath = absolute_path(filename)))
return NULL;
} else {
abspath = (char*) s_malloc(strlen(filename) + 1);
strcpy(abspath, filename);
}
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len = strlen(cache_dir) + strlen(abspath) + 6;
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cfile = (char*) s_malloc(len);
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snprintf(cfile, len, "%s/%s.png", cache_dir, abspath + 1);
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free(abspath);
return cfile;
}
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Imlib_Image* tns_cache_load(const char *filename) {
char *cfile;
struct stat cstats, fstats;
Imlib_Image *im = NULL;
if (!filename || stat(filename, &fstats))
return NULL;
if ((cfile = tns_cache_filename(filename))) {
if (!stat(cfile, &cstats) &&
cstats.st_mtim.tv_sec == fstats.st_mtim.tv_sec &&
cstats.st_mtim.tv_nsec == fstats.st_mtim.tv_nsec)
{
printf("cache hit: %s\n", filename);
im = imlib_load_image(cfile);
} else
printf("cache MISS: %s\n", filename);
free(cfile);
}
return im;
}
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void tns_cache_write(thumb_t *t, Bool force) {
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char *cfile, *dirend;
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struct stat cstats, fstats;
struct timeval times[2];
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Imlib_Load_Error err = 0;
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if (!t || !t->im || !t->filename)
return;
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if (stat(t->filename, &fstats))
return;
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if ((cfile = tns_cache_filename(t->filename))) {
if (force || stat(cfile, &cstats) ||
cstats.st_mtim.tv_sec != fstats.st_mtim.tv_sec ||
cstats.st_mtim.tv_nsec != fstats.st_mtim.tv_nsec)
{
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if ((dirend = strrchr(cfile, '/'))) {
*dirend = '\0';
err = create_dir_rec(cfile);
*dirend = '/';
}
if (!err) {
imlib_context_set_image(t->im);
imlib_image_set_format("png");
imlib_save_image_with_error_return(cfile, &err);
}
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if (err) {
warn("could not cache thumbnail: %s", t->filename);
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} else {
TIMESPEC_TO_TIMEVAL(&times[0], &fstats.st_atim);
TIMESPEC_TO_TIMEVAL(&times[1], &fstats.st_mtim);
utimes(cfile, times);
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printf("thumbnail cache file written: %s\n", t->filename);
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}
}
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free(cfile);
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}
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}