nsxiv/thumbs.c

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/* Copyright 2011 Bert Muennich
*
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* This file is part of sxiv.
*
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* sxiv 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.
*
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* sxiv 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 sxiv. If not, see <http://www.gnu.org/licenses/>.
*/
#define _POSIX_C_SOURCE 200112L
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#define _THUMBS_CONFIG
#define _RENDER_CONFIG
#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <utime.h>
#include "exif.h"
#include "thumbs.h"
#include "util.h"
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#include "config.h"
static const int thumb_dim = THUMB_SIZE + 10;
static const char * const CACHE_DIR = ".sxiv/cache";
static char *cache_dir = NULL;
bool tns_cache_enabled(void)
{
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struct stat stats;
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return cache_dir != NULL && stat(cache_dir, &stats) == 0 &&
S_ISDIR(stats.st_mode) && access(cache_dir, W_OK) == 0;
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}
char* tns_cache_filepath(const char *filepath)
{
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size_t len;
char *cfile = NULL;
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if (cache_dir == NULL || filepath == NULL || *filepath != '/')
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return NULL;
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if (strncmp(filepath, cache_dir, strlen(cache_dir)) != 0) {
/* don't cache images inside the cache directory! */
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len = strlen(cache_dir) + strlen(filepath) + 6;
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cfile = (char*) s_malloc(len);
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snprintf(cfile, len, "%s/%s.png", cache_dir, filepath + 1);
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}
return cfile;
}
Imlib_Image* tns_cache_load(const char *filepath)
{
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char *cfile;
struct stat cstats, fstats;
Imlib_Image *im = NULL;
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if (filepath == NULL)
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return NULL;
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if (stat(filepath, &fstats) < 0)
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return NULL;
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if ((cfile = tns_cache_filepath(filepath)) != NULL) {
if (stat(cfile, &cstats) == 0 && cstats.st_mtime == fstats.st_mtime)
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im = imlib_load_image(cfile);
free(cfile);
}
return im;
}
void tns_cache_write(thumb_t *t, bool force)
{
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char *cfile, *dirend;
struct stat cstats, fstats;
struct utimbuf times;
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Imlib_Load_Error err = 0;
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if (t == NULL || t->im == NULL)
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return;
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if (t->file == NULL || t->file->name == NULL || t->file->path == NULL)
return;
if (stat(t->file->path, &fstats) < 0)
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return;
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if ((cfile = tns_cache_filepath(t->file->path)) != NULL) {
if (force || stat(cfile, &cstats) < 0 ||
cstats.st_mtime != fstats.st_mtime)
{
if ((dirend = strrchr(cfile, '/')) != NULL) {
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*dirend = '\0';
err = r_mkdir(cfile);
*dirend = '/';
}
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if (err == 0) {
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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 == 0) {
times.actime = fstats.st_atime;
times.modtime = fstats.st_mtime;
utime(cfile, &times);
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} else {
warn("could not cache thumbnail: %s", t->file->name);
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}
}
free(cfile);
}
}
void tns_clean_cache(tns_t *tns)
{
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int dirlen;
bool delete;
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char *cfile, *filename, *tpos;
r_dir_t dir;
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if (cache_dir == NULL)
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return;
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if (r_opendir(&dir, cache_dir) < 0) {
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warn("could not open thumbnail cache directory: %s", cache_dir);
return;
}
dirlen = strlen(cache_dir);
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while ((cfile = r_readdir(&dir)) != NULL) {
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filename = cfile + dirlen;
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delete = false;
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if ((tpos = strrchr(filename, '.')) != NULL) {
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*tpos = '\0';
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if (access(filename, F_OK) < 0)
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delete = true;
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*tpos = '.';
}
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if (delete) {
if (unlink(cfile) < 0)
warn("could not delete cache file: %s", cfile);
}
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free(cfile);
}
r_closedir(&dir);
}
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void tns_init(tns_t *tns, int cnt, win_t *win)
{
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int len;
char *homedir;
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if (tns == NULL)
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return;
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if (cnt > 0) {
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tns->thumbs = (thumb_t*) s_malloc(cnt * sizeof(thumb_t));
memset(tns->thumbs, 0, cnt * sizeof(thumb_t));
} else {
tns->thumbs = NULL;
}
tns->cap = cnt;
tns->cnt = tns->first = tns->sel = 0;
tns->win = win;
tns->alpha = !RENDER_WHITE_ALPHA;
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tns->dirty = false;
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if ((homedir = getenv("HOME")) != NULL) {
if (cache_dir != NULL)
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free(cache_dir);
len = strlen(homedir) + strlen(CACHE_DIR) + 2;
cache_dir = (char*) s_malloc(len);
snprintf(cache_dir, len, "%s/%s", homedir, CACHE_DIR);
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} else {
warn("could not locate thumbnail cache directory");
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}
}
void tns_free(tns_t *tns)
{
int i;
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if (tns == NULL)
return;
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if (tns->thumbs != NULL) {
for (i = 0; i < tns->cnt; i++) {
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if (tns->thumbs[i].im != NULL) {
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imlib_context_set_image(tns->thumbs[i].im);
imlib_free_image();
}
}
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free(tns->thumbs);
tns->thumbs = NULL;
}
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if (cache_dir != NULL) {
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free(cache_dir);
cache_dir = NULL;
}
}
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bool tns_load(tns_t *tns, int n, const fileinfo_t *file,
bool force, bool silent)
{
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int w, h;
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bool use_cache, cache_hit = false;
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float z, zw, zh;
thumb_t *t;
Imlib_Image *im;
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const char *fmt;
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if (tns == NULL || tns->thumbs == NULL)
return false;
if (file == NULL || file->name == NULL || file->path == NULL)
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return false;
if (n < 0 || n >= tns->cap)
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return false;
t = &tns->thumbs[n];
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t->file = file;
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if (t->im != NULL) {
imlib_context_set_image(t->im);
imlib_free_image();
}
if ((use_cache = tns_cache_enabled())) {
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if (!force && (im = tns_cache_load(file->path)) != NULL)
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cache_hit = true;
}
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if (!cache_hit) {
if (access(file->path, R_OK) < 0 ||
(im = imlib_load_image(file->path)) == NULL)
{
if (!silent)
warn("could not open image: %s", file->name);
return false;
}
}
imlib_context_set_image(im);
imlib_context_set_anti_alias(1);
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if ((fmt = imlib_image_format()) == NULL) {
if (!silent)
warn("could not open image: %s", file->name);
imlib_free_image_and_decache();
return false;
}
if (STREQ(fmt, "jpeg"))
exif_auto_orientate(file);
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w = imlib_image_get_width();
h = imlib_image_get_height();
zw = (float) THUMB_SIZE / (float) w;
zh = (float) THUMB_SIZE / (float) h;
z = MIN(zw, zh);
z = MIN(z, 1.0);
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t->w = z * w;
t->h = z * h;
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t->im = imlib_create_cropped_scaled_image(0, 0, w, h, t->w, t->h);
if (t->im == NULL)
die("could not allocate memory");
imlib_free_image_and_decache();
if (use_cache && !cache_hit)
tns_cache_write(t, true);
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tns->dirty = true;
return true;
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}
void tns_check_view(tns_t *tns, bool scrolled)
{
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int r;
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if (tns == NULL)
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);
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tns->dirty = true;
} else if (tns->first > tns->sel) {
tns->first = tns->sel - r;
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tns->dirty = true;
}
}
}
void tns_render(tns_t *tns)
{
thumb_t *t;
win_t *win;
int i, cnt, r, x, y;
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if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
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return;
if (!tns->dirty)
return;
win = tns->win;
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 {
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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);
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if (!tns->alpha && imlib_image_has_alpha())
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win_draw_rect(win, win->pm, t->x, t->y, t->w, t->h, true, 0, win->white);
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 = false;
tns_highlight(tns, tns->sel, true);
}
void tns_highlight(tns_t *tns, int n, bool hl)
{
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thumb_t *t;
win_t *win;
int x, y;
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unsigned long col;
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if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
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return;
win = tns->win;
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->fscol;
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else
col = win->bgcol;
x = t->x - (THUMB_SIZE - t->w) / 2;
y = t->y - (THUMB_SIZE - t->h) / 2;
win_draw_rect(win, win->pm, x - 3, y - 3, THUMB_SIZE + 6, THUMB_SIZE + 6,
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false, 2, col);
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}
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}
bool tns_move_selection(tns_t *tns, direction_t dir, int cnt)
{
int old, max;
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if (tns == NULL || tns->thumbs == NULL)
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return false;
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old = tns->sel;
cnt = cnt > 1 ? cnt : 1;
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switch (dir) {
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case DIR_UP:
tns->sel = MAX(tns->sel - cnt * tns->cols, tns->sel % tns->cols);
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break;
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case DIR_DOWN:
max = tns->cols * ((tns->cnt - 1) / tns->cols) +
MIN((tns->cnt - 1) % tns->cols, tns->sel % tns->cols);
tns->sel = MIN(tns->sel + cnt * tns->cols, max);
break;
case DIR_LEFT:
tns->sel = MAX(tns->sel - cnt, 0);
break;
case DIR_RIGHT:
tns->sel = MIN(tns->sel + cnt, tns->cnt - 1);
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break;
}
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if (tns->sel != old) {
tns_highlight(tns, old, false);
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tns_check_view(tns, false);
if (!tns->dirty)
tns_highlight(tns, tns->sel, true);
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}
return tns->sel != old;
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}
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bool tns_scroll(tns_t *tns, direction_t dir, bool screen)
{
int d, max, old;
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if (tns == NULL)
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return false;
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old = tns->first;
d = tns->cols * (screen ? tns->rows : 1);
if (dir == DIR_DOWN) {
max = tns->cnt - tns->cols * tns->rows;
if (tns->cnt % tns->cols != 0)
max += tns->cols - tns->cnt % tns->cols;
tns->first = MIN(tns->first + d, max);
} else if (dir == DIR_UP) {
tns->first = MAX(tns->first - d, 0);
}
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if (tns->first != old) {
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tns_check_view(tns, true);
tns->dirty = true;
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}
return tns->first != old;
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}
int tns_translate(tns_t *tns, int x, int y)
{
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int n;
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if (tns == NULL || tns->thumbs == NULL)
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return -1;
if (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;
if (n >= tns->cnt)
n = -1;
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return n;
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}