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nsxiv/thumbs.c

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/* Copyright 2011 Bert Muennich
*
* This file is part of sxiv.
*
* 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.
*
* 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
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <utime.h>
#include "thumbs.h"
#include "util.h"
#include "config.h"
#if HAVE_LIBEXIF
#include <libexif/exif-data.h>
void exif_auto_orientate(const fileinfo_t*);
#endif
static char *cache_dir;
static const int thumb_size[] = { 32, 64, 96, 128, 160 };
char* tns_cache_filepath(const char *filepath)
{
size_t len;
char *cfile = NULL;
if (cache_dir == NULL || filepath == NULL || *filepath != '/')
return NULL;
if (strncmp(filepath, cache_dir, strlen(cache_dir)) != 0) {
/* don't cache images inside the cache directory! */
len = strlen(cache_dir) + strlen(filepath) + 6;
cfile = (char*) s_malloc(len);
snprintf(cfile, len, "%s/%s.jpg", cache_dir, filepath + 1);
}
return cfile;
}
Imlib_Image tns_cache_load(const char *filepath, bool *outdated)
{
char *cfile;
struct stat cstats, fstats;
Imlib_Image im = NULL;
if (filepath == NULL)
return NULL;
if (stat(filepath, &fstats) < 0)
return NULL;
if ((cfile = tns_cache_filepath(filepath)) != NULL) {
if (stat(cfile, &cstats) == 0) {
if (cstats.st_mtime == fstats.st_mtime)
im = imlib_load_image(cfile);
else
*outdated = true;
}
free(cfile);
}
return im;
}
void tns_cache_write(Imlib_Image im, const char *filepath, bool force)
{
char *cfile, *dirend;
struct stat cstats, fstats;
struct utimbuf times;
Imlib_Load_Error err = 0;
if (im == NULL || filepath == NULL)
return;
if (stat(filepath, &fstats) < 0)
return;
if ((cfile = tns_cache_filepath(filepath)) != NULL) {
if (force || stat(cfile, &cstats) < 0 ||
cstats.st_mtime != fstats.st_mtime)
{
if ((dirend = strrchr(cfile, '/')) != NULL) {
*dirend = '\0';
err = r_mkdir(cfile);
*dirend = '/';
}
if (err == 0) {
imlib_context_set_image(im);
imlib_image_set_format("jpg");
imlib_save_image_with_error_return(cfile, &err);
}
if (err == 0) {
times.actime = fstats.st_atime;
times.modtime = fstats.st_mtime;
utime(cfile, &times);
}
}
free(cfile);
}
}
void tns_clean_cache(tns_t *tns)
{
int dirlen;
bool delete;
char *cfile, *filename, *tpos;
r_dir_t dir;
if (cache_dir == NULL)
return;
if (r_opendir(&dir, cache_dir) < 0) {
warn("could not open thumbnail cache directory: %s", cache_dir);
return;
}
dirlen = strlen(cache_dir);
while ((cfile = r_readdir(&dir)) != NULL) {
filename = cfile + dirlen;
delete = false;
if ((tpos = strrchr(filename, '.')) != NULL) {
*tpos = '\0';
if (access(filename, F_OK) < 0)
delete = true;
*tpos = '.';
}
if (delete) {
if (unlink(cfile) < 0)
warn("could not delete cache file: %s", cfile);
}
free(cfile);
}
r_closedir(&dir);
}
void tns_init(tns_t *tns, const fileinfo_t *files, int cnt, int *sel, win_t *win)
{
int len;
const char *homedir, *dsuffix = "";
if (tns == NULL)
return;
if (cnt > 0) {
tns->thumbs = (thumb_t*) s_malloc(cnt * sizeof(thumb_t));
memset(tns->thumbs, 0, cnt * sizeof(thumb_t));
} else {
tns->thumbs = NULL;
}
tns->files = files;
tns->cnt = cnt;
tns->loadnext = tns->first = tns->end = tns->r_first = tns->r_end = 0;
tns->sel = sel;
tns->win = win;
tns->zl = 1;
tns->dirty = false;
if ((homedir = getenv("XDG_CACHE_HOME")) == NULL || homedir[0] == '\0') {
homedir = getenv("HOME");
dsuffix = "/.cache";
}
if (homedir != NULL) {
free(cache_dir);
len = strlen(homedir) + strlen(dsuffix) + 6;
cache_dir = (char*) s_malloc(len);
snprintf(cache_dir, len, "%s%s/sxiv", homedir, dsuffix);
} else {
warn("could not locate thumbnail cache directory");
}
}
void tns_free(tns_t *tns)
{
int i;
if (tns == NULL)
return;
if (tns->thumbs != NULL) {
for (i = 0; i < tns->cnt; i++) {
if (tns->thumbs[i].im != NULL) {
imlib_context_set_image(tns->thumbs[i].im);
imlib_free_image();
}
}
free(tns->thumbs);
tns->thumbs = NULL;
}
free(cache_dir);
cache_dir = NULL;
}
Imlib_Image tns_scale_down(Imlib_Image im, int dim)
{
int w, h;
float z, zw, zh;
imlib_context_set_image(im);
w = imlib_image_get_width();
h = imlib_image_get_height();
zw = (float) dim / (float) w;
zh = (float) dim / (float) h;
z = MIN(zw, zh);
z = MIN(z, 1.0);
if (z < 1.0) {
imlib_context_set_anti_alias(1);
im = imlib_create_cropped_scaled_image(0, 0, w, h, z * w, z * h);
if (im == NULL)
die("could not allocate memory");
imlib_free_image_and_decache();
}
return im;
}
bool tns_load(tns_t *tns, int n, bool force)
{
int w, h;
bool cache_hit = false;
float zw, zh;
thumb_t *t;
Imlib_Image im = NULL;
const fileinfo_t *file;
if (tns == NULL || tns->thumbs == NULL)
return false;
if (n < 0 || n >= tns->cnt)
return false;
file = &tns->files[n];
if (file->name == NULL || file->path == NULL)
return false;
t = &tns->thumbs[n];
if (t->im != NULL) {
imlib_context_set_image(t->im);
imlib_free_image();
}
if (!force && (im = tns_cache_load(file->path, &force)) != NULL) {
cache_hit = true;
} else {
#if HAVE_LIBEXIF
if (!force) {
int pw = 0, ph = 0, x = 0, y = 0;
bool err;
ExifData *ed;
ExifEntry *entry;
ExifContent *ifd;
ExifByteOrder byte_order;
int tmpfd;
char tmppath[] = "/tmp/sxiv-XXXXXX";
Imlib_Image tmpim;
if ((ed = exif_data_new_from_file(file->path)) != NULL &&
ed->data != NULL && ed->size > 0)
{
if ((tmpfd = mkstemp(tmppath)) >= 0) {
err = write(tmpfd, ed->data, ed->size) != ed->size;
close(tmpfd);
if (!err && (tmpim = imlib_load_image(tmppath)) != NULL) {
byte_order = exif_data_get_byte_order(ed);
ifd = ed->ifd[EXIF_IFD_EXIF];
entry = exif_content_get_entry(ifd, EXIF_TAG_PIXEL_X_DIMENSION);
if (entry != NULL)
pw = exif_get_long(entry->data, byte_order);
entry = exif_content_get_entry(ifd, EXIF_TAG_PIXEL_Y_DIMENSION);
if (entry != NULL)
ph = exif_get_long(entry->data, byte_order);
imlib_context_set_image(tmpim);
w = imlib_image_get_width();
h = imlib_image_get_height();
if (pw > w && ph > h && (pw - ph >= 0) == (w - h >= 0)) {
zw = (float) pw / (float) w;
zh = (float) ph / (float) h;
if (zw < zh) {
pw /= zh;
x = (w - pw) / 2;
w = pw;
} else if (zw > zh) {
ph /= zw;
y = (h - ph) / 2;
h = ph;
}
}
if ((im = imlib_create_cropped_image(x, y, w, h)) == NULL)
die("could not allocate memory");
imlib_free_image_and_decache();
}
unlink(tmppath);
}
exif_data_unref(ed);
}
}
#endif
if (im == NULL && (access(file->path, R_OK) < 0 ||
(im = imlib_load_image(file->path)) == NULL))
{
warn("could not open image: %s", file->name);
return false;
}
}
if (!cache_hit) {
#if HAVE_LIBEXIF
imlib_context_set_image(im);
exif_auto_orientate(file);
#endif
im = tns_scale_down(im, thumb_size[ARRLEN(thumb_size)-1]);
tns_cache_write(im, file->path, true);
}
t->im = tns_scale_down(im, thumb_size[tns->zl]);
imlib_context_set_image(t->im);
t->w = imlib_image_get_width();
t->h = imlib_image_get_height();
tns->dirty = true;
return true;
}
void tns_unload(tns_t *tns, int n)
{
thumb_t *t;
if (tns == NULL || tns->thumbs == NULL)
return;
if (n < 0 || n >= tns->cnt)
return;
t = &tns->thumbs[n];
if (t->im != NULL) {
imlib_context_set_image(t->im);
imlib_free_image();
t->im = NULL;
}
}
void tns_check_view(tns_t *tns, bool scrolled)
{
int r;
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);
tns->dirty = true;
} else if (tns->first > *tns->sel) {
tns->first = *tns->sel - r;
tns->dirty = true;
}
}
}
void tns_render(tns_t *tns)
{
thumb_t *t;
win_t *win;
int i, cnt, r, x, y;
int thumb_dim;
if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
return;
if (!tns->dirty)
return;
win = tns->win;
win_clear(win);
imlib_context_set_drawable(win->buf.pm);
thumb_dim = thumb_size[tns->zl] + 10;
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;
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;
tns->loadnext = tns->cnt;
tns->end = tns->first + cnt;
for (i = tns->r_first; i < tns->r_end; i++) {
if ((i < tns->first || i >= tns->end) && tns->thumbs[i].im != NULL)
tns_unload(tns, i);
}
tns->r_first = tns->first;
tns->r_end = tns->end;
for (i = tns->first; i < tns->end; i++) {
t = &tns->thumbs[i];
if (t->im != NULL) {
t->x = x + (thumb_size[tns->zl] - t->w) / 2;
t->y = y + (thumb_size[tns->zl] - t->h) / 2;
imlib_context_set_image(t->im);
imlib_render_image_on_drawable_at_size(t->x, t->y, t->w, t->h);
if (tns->files[i].marked)
tns_mark(tns, i, true);
} else {
tns->loadnext = MIN(tns->loadnext, i);
}
if ((i + 1) % tns->cols == 0) {
x = tns->x;
y += thumb_dim;
} else {
x += thumb_dim;
}
}
tns->dirty = false;
tns_highlight(tns, *tns->sel, true);
}
void tns_mark(tns_t *tns, int n, bool mark)
{
if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
return;
if (n >= 0 && n < tns->cnt && tns->thumbs[n].im != NULL) {
win_t *win = tns->win;
thumb_t *t = &tns->thumbs[n];
unsigned long col = win->fullscreen ? win->fscol : win->bgcol;
int x = t->x + t->w, y = t->y + t->h;
win_draw_rect(win, x - 1, y + 1, 1, 2, true, 1, col);
win_draw_rect(win, x + 1, y - 1, 2, 1, true, 1, col);
if (mark)
col = win->selcol;
win_draw_rect(win, x, y, 4, 4, true, 1, col);
if (!mark && n == *tns->sel)
tns_highlight(tns, n, true);
}
}
void tns_highlight(tns_t *tns, int n, bool hl)
{
if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
return;
if (n >= 0 && n < tns->cnt && tns->thumbs[n].im != NULL) {
win_t *win = tns->win;
thumb_t *t = &tns->thumbs[n];
unsigned long col;
if (hl)
col = win->selcol;
else
col = win->fullscreen ? win->fscol : win->bgcol;
win_draw_rect(win, t->x - 2, t->y - 2, t->w + 4, t->h + 4, false, 2, col);
if (tns->files[n].marked)
tns_mark(tns, n, true);
}
}
bool tns_move_selection(tns_t *tns, direction_t dir, int cnt)
{
int old, max;
if (tns == NULL || tns->thumbs == NULL)
return false;
old = *tns->sel;
cnt = cnt > 1 ? cnt : 1;
switch (dir) {
case DIR_UP:
*tns->sel = MAX(*tns->sel - cnt * tns->cols, *tns->sel % tns->cols);
break;
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);
break;
}
if (*tns->sel != old) {
tns_highlight(tns, old, false);
tns_check_view(tns, false);
if (!tns->dirty)
tns_highlight(tns, *tns->sel, true);
}
return *tns->sel != old;
}
bool tns_scroll(tns_t *tns, direction_t dir, bool screen)
{
int d, max, old;
if (tns == NULL)
return false;
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);
}
if (tns->first != old) {
tns_check_view(tns, true);
tns->dirty = true;
}
return tns->first != old;
}
bool tns_zoom(tns_t *tns, int d)
{
int i, oldzl;
if (tns == NULL || tns->thumbs == NULL)
return false;
oldzl = tns->zl;
tns->zl += -(d < 0) + (d > 0);
tns->zl = MAX(tns->zl, 0);
tns->zl = MIN(tns->zl, ARRLEN(thumb_size)-1);
if (tns->zl != oldzl) {
for (i = 0; i < tns->cnt; i++)
tns_unload(tns, i);
tns->dirty = true;
}
return tns->zl != oldzl;
}
int tns_translate(tns_t *tns, int x, int y)
{
int n;
if (tns == NULL || tns->thumbs == NULL)
return -1;
if (x < tns->x || y < tns->y)
return -1;
n = tns->first + (y - tns->y) / (thumb_size[tns->zl] + 10) * tns->cols +
(x - tns->x) / (thumb_size[tns->zl] + 10);
if (n >= tns->cnt)
n = -1;
return n;
}
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