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zeniba-nsxiv/thumbs.c
NRK 3659361e76 centralize script handling logic (#477) 
currently the logic of when to open/close script is scattered around the
entire code-base which is both ugly and error-prone.

this patch centralizes script handling by remembering the relevant
information on each redraw and then comparing it with the previous
information to figure out whether something changed or not.

this also fixes a bug where scripts weren't being called in thumbnail
mode when mouse was used for selecting a different image.

Closes: https://codeberg.org/nsxiv/nsxiv/issues/475

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/477
Reviewed-by: eylles <eylles@noreply.codeberg.org>
2023-09-30 08:53:32 +00:00

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/* Copyright 2011-2020 Bert Muennich
* Copyright 2021-2023 nsxiv contributors
*
* This file is a part of nsxiv.
*
* nsxiv 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.
*
* nsxiv 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 nsxiv. If not, see <http://www.gnu.org/licenses/>.
*/
#include "nsxiv.h"
#define INCLUDE_THUMBS_CONFIG
#include "config.h"
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <utime.h>
#if HAVE_LIBEXIF
#include <libexif/exif-data.h>
#endif
static char *cache_dir;
static char *tns_cache_filepath(const char *filepath)
{
size_t len;
char *cfile = NULL;
assert(*filepath == '/' && "filepath should be result of realpath(3)");
if (strncmp(filepath, cache_dir, strlen(cache_dir)) != 0) {
/* don't cache images inside the cache directory! */
len = strlen(cache_dir) + strlen(filepath) + 2;
cfile = emalloc(len);
snprintf(cfile, len, "%s/%s", cache_dir, filepath + 1);
}
return cfile;
}
static Imlib_Image tns_cache_load(const char *filepath, bool *outdated)
{
char *cfile;
struct stat cstats, fstats;
Imlib_Image im = 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;
}
static 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;
if (options->private_mode)
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';
if (r_mkdir(cfile) < 0)
goto end;
*dirend = '/';
}
imlib_context_set_image(im);
if (imlib_image_has_alpha()) {
imlib_image_set_format("png");
} else {
imlib_image_set_format("jpg");
imlib_image_attach_data_value("quality", NULL, 90, NULL);
}
imlib_save_image_with_error_return(cfile, &err);
if (err)
goto end;
times.actime = fstats.st_atime;
times.modtime = fstats.st_mtime;
utime(cfile, &times);
}
end:
free(cfile);
}
}
void tns_clean_cache(void)
{
int dirlen;
char *cfile, *filename;
r_dir_t dir;
if (r_opendir(&dir, cache_dir, true) < 0) {
error(0, errno, "%s", cache_dir);
return;
}
dirlen = strlen(cache_dir);
while ((cfile = r_readdir(&dir, false)) != NULL) {
filename = cfile + dirlen;
if (access(filename, F_OK) < 0) {
if (unlink(cfile) < 0)
error(0, errno, "%s", cfile);
}
free(cfile);
}
r_closedir(&dir);
}
void tns_init(tns_t *tns, fileinfo_t *tns_files, const int *cnt, int *sel, win_t *win)
{
int len;
const char *homedir, *dsuffix = "";
if (cnt != NULL && *cnt > 0)
tns->thumbs = ecalloc(*cnt, sizeof(*tns->thumbs));
else
tns->thumbs = NULL;
tns->files = tns_files;
tns->cnt = cnt;
tns->initnext = tns->loadnext = 0;
tns->first = tns->end = tns->r_first = tns->r_end = 0;
tns->sel = sel;
tns->win = win;
tns->dirty = false;
tns->zl = THUMB_SIZE;
tns_zoom(tns, 0);
if ((homedir = getenv("XDG_CACHE_HOME")) == NULL || homedir[0] == '\0') {
homedir = getenv("HOME");
dsuffix = "/.cache";
}
if (homedir != NULL) {
const char *s = "/nsxiv";
free(cache_dir);
len = strlen(homedir) + strlen(dsuffix) + strlen(s) + 1;
cache_dir = emalloc(len);
snprintf(cache_dir, len, "%s%s%s", homedir, dsuffix, s);
} else {
error(0, 0, "Cache directory not found");
}
}
CLEANUP void tns_free(tns_t *tns)
{
int i;
if (tns->thumbs != NULL) {
for (i = 0; i < *tns->cnt; i++)
img_free(tns->thumbs[i].im, false);
free(tns->thumbs);
tns->thumbs = NULL;
}
free(cache_dir);
cache_dir = NULL;
}
static 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,
MAX(z * w, 1), MAX(z * h, 1));
if (im == NULL)
error(EXIT_FAILURE, ENOMEM, NULL);
imlib_free_image_and_decache();
}
return im;
}
bool tns_load(tns_t *tns, int n, bool force, bool cache_only)
{
int maxwh = thumb_sizes[ARRLEN(thumb_sizes) - 1];
bool cache_hit = false;
char *cfile;
thumb_t *t;
fileinfo_t *file;
Imlib_Image im = NULL;
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];
img_free(t->im, false);
t->im = NULL;
if (!force) {
if ((im = tns_cache_load(file->path, &force)) != NULL) {
imlib_context_set_image(im);
if (imlib_image_get_width() < maxwh &&
imlib_image_get_height() < maxwh)
{
if ((cfile = tns_cache_filepath(file->path)) != NULL) {
unlink(cfile);
free(cfile);
}
imlib_free_image_and_decache();
im = NULL;
} else {
cache_hit = true;
}
#if HAVE_LIBEXIF
} else if (!force && !options->private_mode) {
int pw = 0, ph = 0, w, h, x = 0, y = 0;
bool err;
float zw, zh;
ExifData *ed;
ExifEntry *entry;
ExifContent *ifd;
ExifByteOrder byte_order;
int tmpfd;
char tmppath[] = "/tmp/nsxiv-XXXXXX";
Imlib_Image tmpim;
/* UPGRADE: Imlib2 v1.10.0: avoid tempfile and use imlib_load_image_mem() */
if ((ed = exif_data_new_from_file(file->path)) != NULL) {
if (ed->data != NULL && ed->size > 0 &&
(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 (w >= maxwh || h >= maxwh) {
if ((im = imlib_create_cropped_image(x, y, w, h)) == NULL)
error(0, 0, "%s: error generating thumbnail", file->name);
}
imlib_free_image_and_decache();
}
unlink(tmppath);
}
exif_data_unref(ed);
}
#endif /* HAVE_LIBEXIF */
}
}
if (im == NULL) {
if ((im = img_open(file)) == NULL)
return false;
}
imlib_context_set_image(im);
if (!cache_hit) {
#if HAVE_LIBEXIF
exif_auto_orientate(file);
#endif
im = tns_scale_down(im, maxwh);
imlib_context_set_image(im);
if (imlib_image_get_width() == maxwh || imlib_image_get_height() == maxwh)
tns_cache_write(im, file->path, true);
}
if (cache_only) {
imlib_free_image_and_decache();
} else {
t->im = tns_scale_down(im, thumb_sizes[tns->zl]);
imlib_context_set_image(t->im);
t->w = imlib_image_get_width();
t->h = imlib_image_get_height();
tns->dirty = true;
}
file->flags |= FF_TN_INIT;
if (n == tns->initnext) {
while (++tns->initnext < *tns->cnt && ((++file)->flags & FF_TN_INIT))
;
}
if (n == tns->loadnext && !cache_only) {
while (++tns->loadnext < tns->end && (++t)->im != NULL)
;
}
return true;
}
void tns_unload(tns_t *tns, int n)
{
thumb_t *t;
assert(n >= 0 && n < *tns->cnt);
t = &tns->thumbs[n];
img_free(t->im, false);
t->im = NULL;
}
static void tns_check_view(tns_t *tns, bool scrolled)
{
int r;
assert(tns != NULL);
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;
if (!tns->dirty)
return;
win = tns->win;
win_clear(win);
imlib_context_set_drawable(win->buf.pm);
tns->cols = MAX(1, win->w / tns->dim);
tns->rows = MAX(1, win->h / tns->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) * tns->dim) / 2 + tns->bw + 3;
tns->y = y = (win->h - (cnt / tns->cols + r) * tns->dim) / 2 + tns->bw + 3 +
(win->bar.top ? win->bar.h : 0);
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_sizes[tns->zl] - t->w) / 2;
t->y = y + (thumb_sizes[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].flags & FF_MARK)
tns_mark(tns, i, true);
} else {
tns->loadnext = MIN(tns->loadnext, i);
}
if ((i + 1) % tns->cols == 0) {
x = tns->x;
y += tns->dim;
} else {
x += tns->dim;
}
}
tns->dirty = false;
tns_highlight(tns, *tns->sel, true);
}
void tns_mark(tns_t *tns, int n, bool mark)
{
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->win_bg.pixel;
int x = t->x + t->w, y = t->y + t->h;
win_draw_rect(win, x - 1, y + 1, 1, tns->bw, true, 1, col);
win_draw_rect(win, x + 1, y - 1, tns->bw, 1, true, 1, col);
if (mark)
col = win->mrk_fg.pixel;
win_draw_rect(win, x, y, tns->bw + 2, tns->bw + 2, true, 1, col);
if (!mark && n == *tns->sel)
tns_highlight(tns, n, true);
}
}
void tns_highlight(tns_t *tns, int n, bool hl)
{
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 = hl ? win->win_fg.pixel : win->win_bg.pixel;
int oxy = (tns->bw + 1) / 2 + 1, owh = tns->bw + 2;
win_draw_rect(win, t->x - oxy, t->y - oxy, t->w + owh, t->h + owh,
false, tns->bw, col);
if (tns->files[n].flags & FF_MARK)
tns_mark(tns, n, true);
}
}
bool tns_move_selection(tns_t *tns, direction_t dir, int cnt)
{
int old, max;
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;
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;
oldzl = tns->zl;
tns->zl += -(d < 0) + (d > 0);
tns->zl = MAX(tns->zl, 0);
tns->zl = MIN(tns->zl, (int)ARRLEN(thumb_sizes) - 1);
tns->bw = ((thumb_sizes[tns->zl] - 1) >> 5) + 1;
tns->bw = MIN(tns->bw, 4);
tns->dim = thumb_sizes[tns->zl] + 2 * tns->bw + 6;
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 (x < tns->x || y < tns->y)
return -1;
n = tns->first + (y - tns->y) / tns->dim * tns->cols +
(x - tns->x) / tns->dim;
if (n >= *tns->cnt)
n = -1;
return n;
}
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