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/*
* 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.
*
* See the COPYING file for license information.
*
* Guillaume Chazarain <guichaz@gmail.com>
*/
/******************************************
* Make thumbnails and keep track of them *
******************************************/
#include "gliv.h"
#include "thumbnails.h"
#include "options.h"
#include "tree.h"
#include "thread.h"
#include "callbacks.h"
extern options_struct *options;
static GHashTable *thumbs_hash_table = NULL;
gchar *get_absolute_filename(const gchar * filename)
{
static gchar *cwd = NULL;
if (filename[0] == '/')
return g_strdup(filename);
if (cwd == NULL)
cwd = g_get_current_dir();
while (filename[0] == '.' && filename[1] == '/') {
filename += 2;
while (filename[0] == '/')
filename++;
}
return g_build_filename(cwd, filename, NULL);
}
/*
* We include the thumbnails wanted dimensions in the hash key, this way we can
* keep track of many thumbnails with different sizes for a given filename.
*/
static gchar *get_key(const gchar * filename)
{
gchar *key, *fullpath;
fullpath = get_absolute_filename(filename);
key = g_strdup_printf("%s_%d_%d", fullpath,
options->thumb_width, options->thumb_height);
g_free(fullpath);
return key;
}
static GdkPixbuf *create_mini(GdkPixbuf * pixbuf)
{
gint w, h;
gfloat zoom_w, zoom_h, zoom;
gint mini_w, mini_h;
GdkPixbuf *res;
w = gdk_pixbuf_get_width(pixbuf);
h = gdk_pixbuf_get_height(pixbuf);
zoom_w = (gfloat) w / options->thumb_width;
zoom_h = (gfloat) h / options->thumb_height;
zoom = MAX(zoom_w, zoom_h);
if (zoom <= 1.0) {
/* A thumbnail should not be bigger than the original. */
g_object_ref(pixbuf);
return pixbuf;
}
mini_w = (gint) (w / zoom);
mini_h = (gint) (h / zoom);
mini_w = MAX(mini_w, 1);
mini_h = MAX(mini_h, 1);
res = gdk_pixbuf_scale_simple(pixbuf, mini_w, mini_h, GDK_INTERP_BILINEAR);
return res;
}
static void init_hash(void)
{
if (thumbs_hash_table == NULL)
/* First time. */
thumbs_hash_table = g_hash_table_new(g_str_hash, g_str_equal);
}
/* Runs in a separate thread. */
static GdkPixbuf *get_mini(const gchar * filename)
{
GdkPixbuf *pixbuf, *mini;
if (canceled_using_tree())
return NULL;
pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
if (pixbuf == NULL)
return NULL;
if (canceled_using_tree()) {
g_object_unref(pixbuf);
return NULL;
}
mini = create_mini(pixbuf);
g_object_unref(pixbuf);
return mini;
}
/* Called when we have loaded an image, to add its thumbnail. */
void add_thumbnail(const gchar * filename, GdkPixbuf * pixbuf)
{
gchar *key;
GdkPixbuf *mini;
init_hash();
key = get_key(filename);
if (g_hash_table_lookup(thumbs_hash_table, key) != NULL) {
g_free(key);
return;
}
mini = do_threaded((GThreadFunc) create_mini, pixbuf);
if (mini == NULL) {
g_free(key);
return;
}
g_hash_table_insert(thumbs_hash_table, key, mini);
if (mini == pixbuf)
g_object_ref(pixbuf);
}
gboolean fill_thumbnail(tree_item * item)
{
if (item->thumb != NULL) {
/* Simulate the do_threaded() effect. */
process_events();
return TRUE;
}
if (item->thumb_key == NULL)
item->thumb_key = get_key(item->path);
init_hash();
item->thumb = g_hash_table_lookup(thumbs_hash_table, item->thumb_key);
if (item->thumb != NULL)
return TRUE;
item->thumb = do_threaded((GThreadFunc) get_mini, item->path);
if (item->thumb == NULL)
return FALSE;
g_hash_table_insert(thumbs_hash_table, g_strdup(item->thumb_key),
item->thumb);
return TRUE;
}
void collection_add_thumbnail(gchar * key, GdkPixbuf * thumb)
{
init_hash();
g_hash_table_insert(thumbs_hash_table, key, thumb);
}
GdkPixbuf *get_thumbnail(const gchar * filename, gchar ** thumb_key)
{
tree_item item;
item.name = NULL;
item.path = (gchar *) filename;
item.thumb_key = NULL;
item.thumb = NULL;
fill_thumbnail(&item);
if (thumb_key)
*thumb_key = item.thumb_key;
return item.thumb;
}
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