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- /* sxiv: thumbs.c
- * Copyright (c) 2012 Bert Muennich <be.muennich at googlemail.com>
- *
- * 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.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
-
- #define _POSIX_C_SOURCE 200112L
- #define _THUMBS_CONFIG
-
- #include <stdlib.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <unistd.h>
- #include <utime.h>
-
- #include "exif.h"
- #include "thumbs.h"
- #include "util.h"
- #include "config.h"
-
- const int thumb_dim = THUMB_SIZE + 10;
- char *cache_dir = NULL;
-
- bool tns_cache_enabled(void) {
- struct stat stats;
-
- return cache_dir != NULL && stat(cache_dir, &stats) == 0 &&
- S_ISDIR(stats.st_mode) && access(cache_dir, W_OK) == 0;
- }
-
- 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.png", cache_dir, filepath + 1);
- }
- return cfile;
- }
-
- Imlib_Image* tns_cache_load(const char *filepath) {
- 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 && cstats.st_mtime == fstats.st_mtime)
- im = imlib_load_image(cfile);
- free(cfile);
- }
- return im;
- }
-
- void tns_cache_write(thumb_t *t, bool force) {
- char *cfile, *dirend;
- struct stat cstats, fstats;
- struct utimbuf times;
- Imlib_Load_Error err = 0;
-
- if (t == NULL || t->im == NULL)
- return;
- if (t->file == NULL || t->file->name == NULL || t->file->path == NULL)
- return;
- if (stat(t->file->path, &fstats) < 0)
- return;
-
- 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) {
- *dirend = '\0';
- err = r_mkdir(cfile);
- *dirend = '/';
- }
-
- if (err == 0) {
- imlib_context_set_image(t->im);
- imlib_image_set_format("png");
- imlib_save_image_with_error_return(cfile, &err);
- }
-
- if (err == 0) {
- times.actime = fstats.st_atime;
- times.modtime = fstats.st_mtime;
- utime(cfile, ×);
- } else {
- warn("could not cache thumbnail: %s", t->file->name);
- }
- }
- 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, int cnt, win_t *win) {
- int len;
- char *homedir;
-
- 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->cap = cnt;
- tns->cnt = tns->first = tns->sel = 0;
- tns->win = win;
- tns->alpha = true;
- tns->dirty = false;
-
- if ((homedir = getenv("HOME")) != NULL) {
- if (cache_dir != NULL)
- free(cache_dir);
- len = strlen(homedir) + 10;
- cache_dir = (char*) s_malloc(len * sizeof(char));
- snprintf(cache_dir, len, "%s/.sxiv", homedir);
- } 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;
- }
-
- if (cache_dir != NULL) {
- free(cache_dir);
- cache_dir = NULL;
- }
- }
-
- bool tns_load(tns_t *tns, int n, const fileinfo_t *file,
- bool force, bool silent)
- {
- int w, h;
- bool use_cache, cache_hit = false;
- float z, zw, zh;
- thumb_t *t;
- Imlib_Image *im;
- const char *fmt;
-
- if (tns == NULL || tns->thumbs == NULL)
- return false;
- if (file == NULL || file->name == NULL || file->path == NULL)
- return false;
- if (n < 0 || n >= tns->cap)
- return false;
-
- t = &tns->thumbs[n];
- t->file = file;
-
- if (t->im != NULL) {
- imlib_context_set_image(t->im);
- imlib_free_image();
- }
-
- if ((use_cache = tns_cache_enabled())) {
- if (!force && (im = tns_cache_load(file->path)) != NULL)
- cache_hit = true;
- }
-
- 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);
-
- 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);
-
- 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);
- t->w = z * w;
- t->h = z * h;
-
- 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);
-
- tns->dirty = true;
- return true;
- }
-
- 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;
-
- 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->pm);
-
- 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;
-
- 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);
-
- if (!tns->alpha && imlib_image_has_alpha())
- 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) {
- x = tns->x;
- y += thumb_dim;
- } else {
- x += thumb_dim;
- }
- }
- tns->dirty = false;
- tns_highlight(tns, tns->sel, true);
- }
-
- void tns_highlight(tns_t *tns, int n, bool hl) {
- thumb_t *t;
- win_t *win;
- int x, y;
- unsigned long col;
-
- if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
- return;
-
- win = tns->win;
-
- if (n >= 0 && n < tns->cnt) {
- t = &tns->thumbs[n];
-
- if (hl)
- col = win->selcol;
- else if (win->fullscreen)
- col = win->fscol;
- 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,
- false, 2, col);
- }
- }
-
- 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;
- }
-
- 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_dim * tns->cols +
- (x - tns->x) / thumb_dim;
- if (n >= tns->cnt)
- n = -1;
-
- return n;
- }
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