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gnome-desktop-thumbnail.c
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gnome-desktop-thumbnail.c
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/*
* gnome-thumbnail.c: Utilities for handling thumbnails
*
* Copyright (C) 2002 Red Hat, Inc.
* Copyright (C) 2010 Carlos Garcia Campos <carlosgc@gnome.org>
*
* This file is part of the Gnome Library.
*
* The Gnome Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* The Gnome Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the Gnome Library; see the file COPYING.LIB. If not,
* write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdlib.h>
#include <dirent.h>
#include <time.h>
#include <math.h>
#include <string.h>
#include <glib.h>
#include <stdio.h>
#include <errno.h>
#define GDK_PIXBUF_ENABLE_BACKEND
#include <gdk-pixbuf/gdk-pixbuf.h>
#define GNOME_DESKTOP_USE_UNSTABLE_API
#include "gnome-desktop-thumbnail.h"
#include "gnome-desktop-utils.h"
#include <glib/gstdio.h>
#define SECONDS_BETWEEN_STATS 10
struct _GnomeDesktopThumbnailFactoryPrivate {
GnomeDesktopThumbnailSize size;
GMutex lock;
GList *thumbnailers;
GHashTable *mime_types_map;
GList *monitors;
GSettings *settings;
gboolean loaded : 1;
gboolean disabled : 1;
gchar **disabled_types;
gboolean permissions_problem;
gboolean needs_chown;
uid_t real_uid;
gid_t real_gid;
};
static const char *appname = "gnome-thumbnail-factory";
static void gnome_desktop_thumbnail_factory_init (GnomeDesktopThumbnailFactory *factory);
static void gnome_desktop_thumbnail_factory_class_init (GnomeDesktopThumbnailFactoryClass *class);
G_DEFINE_TYPE_WITH_PRIVATE (GnomeDesktopThumbnailFactory, gnome_desktop_thumbnail_factory, G_TYPE_OBJECT)
#define parent_class gnome_desktop_thumbnail_factory_parent_class
typedef struct {
gint width;
gint height;
gint input_width;
gint input_height;
gboolean preserve_aspect_ratio;
} SizePrepareContext;
#define LOAD_BUFFER_SIZE 4096
#define THUMBNAILER_ENTRY_GROUP "Thumbnailer Entry"
#define THUMBNAILER_EXTENSION ".thumbnailer"
typedef struct {
volatile gint ref_count;
gchar *path;
gchar *try_exec;
gchar *command;
gchar **mime_types;
} Thumbnailer;
static Thumbnailer *
thumbnailer_ref (Thumbnailer *thumb)
{
g_return_val_if_fail (thumb != NULL, NULL);
g_return_val_if_fail (thumb->ref_count > 0, NULL);
g_atomic_int_inc (&thumb->ref_count);
return thumb;
}
static void
thumbnailer_unref (Thumbnailer *thumb)
{
g_return_if_fail (thumb != NULL);
g_return_if_fail (thumb->ref_count > 0);
if (g_atomic_int_dec_and_test (&thumb->ref_count))
{
g_free (thumb->path);
g_free (thumb->try_exec);
g_free (thumb->command);
g_strfreev (thumb->mime_types);
g_slice_free (Thumbnailer, thumb);
}
}
static Thumbnailer *
thumbnailer_load (Thumbnailer *thumb)
{
GKeyFile *key_file;
GError *error = NULL;
key_file = g_key_file_new ();
if (!g_key_file_load_from_file (key_file, thumb->path, 0, &error))
{
g_warning ("Failed to load thumbnailer from \"%s\": %s\n", thumb->path, error->message);
g_error_free (error);
thumbnailer_unref (thumb);
g_key_file_free (key_file);
return NULL;
}
if (!g_key_file_has_group (key_file, THUMBNAILER_ENTRY_GROUP))
{
g_warning ("Invalid thumbnailer: missing group \"%s\"\n", THUMBNAILER_ENTRY_GROUP);
thumbnailer_unref (thumb);
g_key_file_free (key_file);
return NULL;
}
thumb->command = g_key_file_get_string (key_file, THUMBNAILER_ENTRY_GROUP, "Exec", NULL);
if (!thumb->command)
{
g_warning ("Invalid thumbnailer: missing Exec key\n");
thumbnailer_unref (thumb);
g_key_file_free (key_file);
return NULL;
}
thumb->mime_types = g_key_file_get_string_list (key_file, THUMBNAILER_ENTRY_GROUP, "MimeType", NULL, NULL);
if (!thumb->mime_types)
{
g_warning ("Invalid thumbnailer: missing MimeType key\n");
thumbnailer_unref (thumb);
g_key_file_free (key_file);
return NULL;
}
thumb->try_exec = g_key_file_get_string (key_file, THUMBNAILER_ENTRY_GROUP, "TryExec", NULL);
if (thumb->try_exec != NULL)
{
gchar *path_to_exec = g_find_program_in_path (thumb->try_exec);
if (path_to_exec == NULL)
{
g_message ("Ignoring thumbnailer with missing binary: '%s'", thumb->try_exec);
thumbnailer_unref (thumb);
g_key_file_free (key_file);
return NULL;
}
g_free (path_to_exec);
}
g_key_file_free (key_file);
return thumb;
}
static Thumbnailer *
thumbnailer_reload (Thumbnailer *thumb)
{
g_return_val_if_fail (thumb != NULL, NULL);
g_free (thumb->command);
thumb->command = NULL;
g_strfreev (thumb->mime_types);
thumb->mime_types = NULL;
g_free (thumb->try_exec);
thumb->try_exec = NULL;
return thumbnailer_load (thumb);
}
static Thumbnailer *
thumbnailer_new (const gchar *path)
{
Thumbnailer *thumb;
thumb = g_slice_new0 (Thumbnailer);
thumb->ref_count = 1;
thumb->path = g_strdup (path);
return thumbnailer_load (thumb);
}
static gpointer
init_thumbnailers_dirs (gpointer data)
{
const gchar * const *data_dirs;
gchar **thumbs_dirs;
guint i, length;
data_dirs = g_get_system_data_dirs ();
length = g_strv_length ((char **) data_dirs);
thumbs_dirs = g_new (gchar *, length + 2);
thumbs_dirs[0] = g_build_filename (g_get_user_data_dir (), "thumbnailers", NULL);
for (i = 0; i < length; i++)
thumbs_dirs[i + 1] = g_build_filename (data_dirs[i], "thumbnailers", NULL);
thumbs_dirs[length + 1] = NULL;
return thumbs_dirs;
}
static const gchar * const *
get_thumbnailers_dirs (void)
{
static GOnce once_init = G_ONCE_INIT;
return g_once (&once_init, init_thumbnailers_dirs, NULL);
}
static void
size_prepared_cb (GdkPixbufLoader *loader,
int width,
int height,
gpointer data)
{
SizePrepareContext *info = data;
g_return_if_fail (width > 0 && height > 0);
info->input_width = width;
info->input_height = height;
if (width < info->width && height < info->height) return;
if (info->preserve_aspect_ratio &&
(info->width > 0 || info->height > 0)) {
if (info->width < 0)
{
width = width * (double)info->height/(double)height;
height = info->height;
}
else if (info->height < 0)
{
height = height * (double)info->width/(double)width;
width = info->width;
}
else if ((double)height * (double)info->width >
(double)width * (double)info->height) {
width = 0.5 + (double)width * (double)info->height / (double)height;
height = info->height;
} else {
height = 0.5 + (double)height * (double)info->width / (double)width;
width = info->width;
}
} else {
if (info->width > 0)
width = info->width;
if (info->height > 0)
height = info->height;
}
gdk_pixbuf_loader_set_size (loader, width, height);
}
static GdkPixbufLoader *
create_loader (GFile *file,
const guchar *data,
gsize size)
{
GdkPixbufLoader *loader;
GError *error = NULL;
char *mime_type;
char *filename;
loader = NULL;
/* need to specify the type here because the gdk_pixbuf_loader_write
doesn't have access to the filename in order to correct detect
the image type. */
filename = g_file_get_basename (file);
mime_type = g_content_type_guess (filename, data, size, NULL);
g_free (filename);
if (mime_type != NULL) {
loader = gdk_pixbuf_loader_new_with_mime_type (mime_type, &error);
}
if (loader == NULL && error != NULL) {
g_warning ("Unable to create loader for mime type %s: %s", mime_type, error->message);
g_clear_error (&error);
loader = gdk_pixbuf_loader_new ();
}
g_free (mime_type);
return loader;
}
static GdkPixbuf *
_gdk_pixbuf_new_from_uri_at_scale (const char *uri,
gint width,
gint height,
gboolean preserve_aspect_ratio)
{
gboolean result;
guchar buffer[LOAD_BUFFER_SIZE];
gsize bytes_read;
GdkPixbufLoader *loader = NULL;
GdkPixbuf *pixbuf;
GdkPixbufAnimation *animation;
GdkPixbufAnimationIter *iter;
gboolean has_frame;
SizePrepareContext info;
GFile *file;
GFileInfo *file_info;
GInputStream *input_stream;
GError *error = NULL;
g_return_val_if_fail (uri != NULL, NULL);
input_stream = NULL;
file = g_file_new_for_uri (uri);
/* First see if we can get an input stream via preview::icon */
file_info = g_file_query_info (file,
G_FILE_ATTRIBUTE_PREVIEW_ICON,
G_FILE_QUERY_INFO_NONE,
NULL, /* GCancellable */
NULL); /* return location for GError */
if (file_info != NULL) {
GObject *object;
object = g_file_info_get_attribute_object (file_info,
G_FILE_ATTRIBUTE_PREVIEW_ICON);
if (object != NULL && G_IS_LOADABLE_ICON (object)) {
input_stream = g_loadable_icon_load (G_LOADABLE_ICON (object),
0, /* size */
NULL, /* return location for type */
NULL, /* GCancellable */
NULL); /* return location for GError */
}
g_object_unref (file_info);
}
if (input_stream == NULL) {
input_stream = G_INPUT_STREAM (g_file_read (file, NULL, &error));
if (input_stream == NULL) {
if (error != NULL) {
g_warning ("Unable to create an input stream for %s: %s", uri, error->message);
g_clear_error (&error);
}
g_object_unref (file);
return NULL;
}
}
has_frame = FALSE;
result = FALSE;
while (!has_frame) {
bytes_read = g_input_stream_read (input_stream,
buffer,
sizeof (buffer),
NULL,
&error);
if (error != NULL) {
g_warning ("Error reading from %s: %s", uri, error->message);
g_clear_error (&error);
}
if (bytes_read == -1) {
break;
}
result = TRUE;
if (bytes_read == 0) {
break;
}
if (loader == NULL) {
loader = create_loader (file, buffer, bytes_read);
if (1 <= width || 1 <= height) {
info.width = width;
info.height = height;
info.input_width = info.input_height = 0;
info.preserve_aspect_ratio = preserve_aspect_ratio;
g_signal_connect (loader, "size-prepared", G_CALLBACK (size_prepared_cb), &info);
}
g_assert (loader != NULL);
}
if (!gdk_pixbuf_loader_write (loader,
(unsigned char *)buffer,
bytes_read,
&error)) {
g_warning ("Error creating thumbnail for %s: %s", uri, error->message);
g_clear_error (&error);
result = FALSE;
break;
}
animation = gdk_pixbuf_loader_get_animation (loader);
if (animation) {
iter = gdk_pixbuf_animation_get_iter (animation, NULL);
if (!gdk_pixbuf_animation_iter_on_currently_loading_frame (iter)) {
has_frame = TRUE;
}
g_object_unref (iter);
}
}
if (!GDK_IS_PIXBUF_LOADER (loader)) {
g_input_stream_close (input_stream, NULL, NULL);
g_object_unref (input_stream);
g_object_unref (file);
return NULL;
}
gdk_pixbuf_loader_close (loader, NULL);
if (!result) {
g_object_unref (G_OBJECT (loader));
g_input_stream_close (input_stream, NULL, NULL);
g_object_unref (input_stream);
g_object_unref (file);
return NULL;
}
g_input_stream_close (input_stream, NULL, NULL);
g_object_unref (input_stream);
g_object_unref (file);
pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
if (pixbuf != NULL) {
g_object_ref (G_OBJECT (pixbuf));
g_object_set_data (G_OBJECT (pixbuf), "gnome-original-width",
GINT_TO_POINTER (info.input_width));
g_object_set_data (G_OBJECT (pixbuf), "gnome-original-height",
GINT_TO_POINTER (info.input_height));
}
g_object_unref (G_OBJECT (loader));
return pixbuf;
}
static void
gnome_desktop_thumbnail_factory_finalize (GObject *object)
{
GnomeDesktopThumbnailFactory *factory;
GnomeDesktopThumbnailFactoryPrivate *priv;
factory = GNOME_DESKTOP_THUMBNAIL_FACTORY (object);
priv = factory->priv;
if (priv->thumbnailers)
{
g_list_free_full (priv->thumbnailers, (GDestroyNotify)thumbnailer_unref);
priv->thumbnailers = NULL;
}
g_clear_pointer (&priv->mime_types_map, g_hash_table_destroy);
if (priv->monitors)
{
g_list_free_full (priv->monitors, (GDestroyNotify)g_object_unref);
priv->monitors = NULL;
}
g_mutex_clear (&priv->lock);
g_clear_pointer (&priv->disabled_types, g_strfreev);
g_clear_object (&priv->settings);
if (G_OBJECT_CLASS (parent_class)->finalize)
(* G_OBJECT_CLASS (parent_class)->finalize) (object);
}
/* These should be called with the lock held */
static void
gnome_desktop_thumbnail_factory_register_mime_types (GnomeDesktopThumbnailFactory *factory,
Thumbnailer *thumb)
{
GnomeDesktopThumbnailFactoryPrivate *priv = factory->priv;
gint i;
for (i = 0; thumb->mime_types[i]; i++)
{
if (!g_hash_table_lookup (priv->mime_types_map, thumb->mime_types[i]))
g_hash_table_insert (priv->mime_types_map,
g_strdup (thumb->mime_types[i]),
thumbnailer_ref (thumb));
}
}
static void
gnome_desktop_thumbnail_factory_add_thumbnailer (GnomeDesktopThumbnailFactory *factory,
Thumbnailer *thumb)
{
GnomeDesktopThumbnailFactoryPrivate *priv = factory->priv;
gnome_desktop_thumbnail_factory_register_mime_types (factory, thumb);
priv->thumbnailers = g_list_prepend (priv->thumbnailers, thumb);
}
static gboolean
gnome_desktop_thumbnail_factory_is_disabled (GnomeDesktopThumbnailFactory *factory,
const gchar *mime_type)
{
GnomeDesktopThumbnailFactoryPrivate *priv = factory->priv;
guint i;
if (priv->disabled)
return TRUE;
if (!priv->disabled_types)
return FALSE;
for (i = 0; priv->disabled_types[i]; i++)
{
if (g_strcmp0 (priv->disabled_types[i], mime_type) == 0)
return TRUE;
}
return FALSE;
}
static gboolean
remove_thumbnailer_from_mime_type_map (gchar *key,
Thumbnailer *value,
gchar *path)
{
return (strcmp (value->path, path) == 0);
}
static void
update_or_create_thumbnailer (GnomeDesktopThumbnailFactory *factory,
const gchar *path)
{
GnomeDesktopThumbnailFactoryPrivate *priv = factory->priv;
GList *l;
Thumbnailer *thumb;
gboolean found = FALSE;
g_mutex_lock (&priv->lock);
for (l = priv->thumbnailers; l && !found; l = g_list_next (l))
{
thumb = (Thumbnailer *)l->data;
if (strcmp (thumb->path, path) == 0)
{
found = TRUE;
/* First remove the mime_types associated to this thumbnailer */
g_hash_table_foreach_remove (priv->mime_types_map,
(GHRFunc)remove_thumbnailer_from_mime_type_map,
(gpointer)path);
if (!thumbnailer_reload (thumb))
priv->thumbnailers = g_list_delete_link (priv->thumbnailers, l);
else
gnome_desktop_thumbnail_factory_register_mime_types (factory, thumb);
}
}
if (!found)
{
thumb = thumbnailer_new (path);
if (thumb)
gnome_desktop_thumbnail_factory_add_thumbnailer (factory, thumb);
}
g_mutex_unlock (&priv->lock);
}
static void
remove_thumbnailer (GnomeDesktopThumbnailFactory *factory,
const gchar *path)
{
GnomeDesktopThumbnailFactoryPrivate *priv = factory->priv;
GList *l;
Thumbnailer *thumb;
g_mutex_lock (&priv->lock);
for (l = priv->thumbnailers; l; l = g_list_next (l))
{
thumb = (Thumbnailer *)l->data;
if (strcmp (thumb->path, path) == 0)
{
priv->thumbnailers = g_list_delete_link (priv->thumbnailers, l);
g_hash_table_foreach_remove (priv->mime_types_map,
(GHRFunc)remove_thumbnailer_from_mime_type_map,
(gpointer)path);
thumbnailer_unref (thumb);
break;
}
}
g_mutex_unlock (&priv->lock);
}
static void
thumbnailers_directory_changed (GFileMonitor *monitor,
GFile *file,
GFile *other_file,
GFileMonitorEvent event_type,
GnomeDesktopThumbnailFactory *factory)
{
gchar *path;
switch (event_type)
{
case G_FILE_MONITOR_EVENT_CREATED:
case G_FILE_MONITOR_EVENT_CHANGED:
case G_FILE_MONITOR_EVENT_DELETED:
path = g_file_get_path (file);
if (!g_str_has_suffix (path, THUMBNAILER_EXTENSION))
{
g_free (path);
return;
}
if (event_type == G_FILE_MONITOR_EVENT_DELETED)
remove_thumbnailer (factory, path);
else
update_or_create_thumbnailer (factory, path);
g_free (path);
break;
default:
break;
}
}
static void
gnome_desktop_thumbnail_factory_load_thumbnailers (GnomeDesktopThumbnailFactory *factory)
{
GnomeDesktopThumbnailFactoryPrivate *priv = factory->priv;
const gchar * const *dirs;
guint i;
if (priv->loaded)
return;
dirs = get_thumbnailers_dirs ();
for (i = 0; dirs[i]; i++)
{
const gchar *path = dirs[i];
GDir *dir;
GFile *dir_file;
GFileMonitor *monitor;
const gchar *dirent;
dir = g_dir_open (path, 0, NULL);
if (!dir)
continue;
/* Monitor dir */
dir_file = g_file_new_for_path (path);
monitor = g_file_monitor_directory (dir_file,
G_FILE_MONITOR_NONE,
NULL, NULL);
if (monitor)
{
g_signal_connect (monitor, "changed",
G_CALLBACK (thumbnailers_directory_changed),
factory);
priv->monitors = g_list_prepend (priv->monitors, monitor);
}
g_object_unref (dir_file);
while ((dirent = g_dir_read_name (dir)))
{
Thumbnailer *thumb;
gchar *filename;
if (!g_str_has_suffix (dirent, THUMBNAILER_EXTENSION))
continue;
filename = g_build_filename (path, dirent, NULL);
thumb = thumbnailer_new (filename);
g_free (filename);
if (thumb)
gnome_desktop_thumbnail_factory_add_thumbnailer (factory, thumb);
}
g_dir_close (dir);
}
priv->loaded = TRUE;
}
static void
external_thumbnailers_disabled_all_changed_cb (GSettings *settings,
const gchar *key,
GnomeDesktopThumbnailFactory *factory)
{
GnomeDesktopThumbnailFactoryPrivate *priv = factory->priv;
g_mutex_lock (&priv->lock);
priv->disabled = g_settings_get_boolean (priv->settings, "disable-all");
if (priv->disabled)
{
g_strfreev (priv->disabled_types);
priv->disabled_types = NULL;
}
else
{
priv->disabled_types = g_settings_get_strv (priv->settings, "disable");
gnome_desktop_thumbnail_factory_load_thumbnailers (factory);
}
g_mutex_unlock (&priv->lock);
}
static void
external_thumbnailers_disabled_changed_cb (GSettings *settings,
const gchar *key,
GnomeDesktopThumbnailFactory *factory)
{
GnomeDesktopThumbnailFactoryPrivate *priv = factory->priv;
g_mutex_lock (&priv->lock);
if (!priv->disabled)
{
g_strfreev (priv->disabled_types);
priv->disabled_types = g_settings_get_strv (priv->settings, "disable");
}
g_mutex_unlock (&priv->lock);
}
/* There are various different behavior depending on whether the application
ran with sudo, pkexec, under the root user, and 'sudo su'...
- sudo (program) keeps the user's home folder (and their .cache folder)
- pkexec (program) uses root's .cache folder
- root terminal, running (program) uses root's .cache folder
- sudo su, then running (program), uses root's .cache folder
Using sudo, or sudo su, SUDO_UID and friends are set in the environment
Using pkexec, PKEXEC_UID is set
root terminal and pkexec cases don't need any extra work - they're thumbnailing
with the correct permissions (root-owned in root's .cache folder)
sudo and sudo su need help, and each in a different way:
- sudo su gives a false positive, since SUDO_UID is set, *but* the program
is using root's .cache folder, so we really don't want to fix these
- sudo (program) wants to use the user's cache folder, but will end up writing
them as root:root files, instead of user:user. So, in this case, we make sure
to chmod those files to be owned by the original user, and not root.
*/
static void
get_user_info (GnomeDesktopThumbnailFactory *factory,
gboolean *adjust,
uid_t *uid,
gid_t *gid)
{
struct passwd *pwent;
pwent = gnome_desktop_get_session_user_pwent ();
*uid = pwent->pw_uid;
*gid = pwent->pw_gid;
/* Only can (and need to) adjust if we're root, but
this process will be writing to the session user's
home folder */
*adjust = geteuid () == 0 &&
g_strcmp0 (pwent->pw_dir, g_get_home_dir ()) == 0;
}
static void
gnome_desktop_thumbnail_factory_init (GnomeDesktopThumbnailFactory *factory)
{
GnomeDesktopThumbnailFactoryPrivate *priv;
factory->priv = gnome_desktop_thumbnail_factory_get_instance_private (factory);
priv = factory->priv;
priv->size = GNOME_DESKTOP_THUMBNAIL_SIZE_NORMAL;
priv->mime_types_map = g_hash_table_new_full (g_str_hash,
g_str_equal,
(GDestroyNotify)g_free,
(GDestroyNotify)thumbnailer_unref);
get_user_info (factory, &priv->needs_chown, &priv->real_uid, &priv->real_gid);
priv->permissions_problem = !gnome_desktop_thumbnail_cache_check_permissions (NULL, TRUE);
g_mutex_init (&priv->lock);
priv->settings = g_settings_new ("org.cinnamon.desktop.thumbnailers");
priv->disabled = g_settings_get_boolean (priv->settings, "disable-all");
if (!priv->disabled)
priv->disabled_types = g_settings_get_strv (priv->settings, "disable");
g_signal_connect (priv->settings, "changed::disable-all",
G_CALLBACK (external_thumbnailers_disabled_all_changed_cb),
factory);
g_signal_connect (priv->settings, "changed::disable",
G_CALLBACK (external_thumbnailers_disabled_changed_cb),
factory);
if (!priv->disabled)
gnome_desktop_thumbnail_factory_load_thumbnailers (factory);
}
static void
gnome_desktop_thumbnail_factory_class_init (GnomeDesktopThumbnailFactoryClass *class)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (class);
gobject_class->finalize = gnome_desktop_thumbnail_factory_finalize;
}
/**
* gnome_desktop_thumbnail_factory_new:
* @size: The thumbnail size to use
*
* Creates a new #GnomeDesktopThumbnailFactory.
*
* This function must be called on the main thread.
*
* Return value: a new #GnomeDesktopThumbnailFactory
*
* Since: 2.2
**/
GnomeDesktopThumbnailFactory *
gnome_desktop_thumbnail_factory_new (GnomeDesktopThumbnailSize size)
{
GnomeDesktopThumbnailFactory *factory;
factory = g_object_new (GNOME_DESKTOP_TYPE_THUMBNAIL_FACTORY, NULL);
factory->priv->size = size;
return factory;
}
/**
* gnome_desktop_thumbnail_factory_lookup:
* @factory: a #GnomeDesktopThumbnailFactory
* @uri: the uri of a file
* @mtime: the mtime of the file
*
* Tries to locate an existing thumbnail for the file specified.
*
* Usage of this function is threadsafe.
*
* Return value: The absolute path of the thumbnail, or %NULL if none exist.
*
* Since: 2.2
**/
char *
gnome_desktop_thumbnail_factory_lookup (GnomeDesktopThumbnailFactory *factory,
const char *uri,
time_t mtime)
{
GnomeDesktopThumbnailFactoryPrivate *priv = factory->priv;
char *path, *file;
GChecksum *checksum;
guint8 digest[16];
gsize digest_len = sizeof (digest);
GdkPixbuf *pixbuf;
gboolean res;
g_return_val_if_fail (uri != NULL, NULL);
res = FALSE;
checksum = g_checksum_new (G_CHECKSUM_MD5);
g_checksum_update (checksum, (const guchar *) uri, strlen (uri));
g_checksum_get_digest (checksum, digest, &digest_len);
g_assert (digest_len == 16);
file = g_strconcat (g_checksum_get_string (checksum), ".png", NULL);
path = g_build_filename (g_get_user_cache_dir (),
"thumbnails",
(priv->size == GNOME_DESKTOP_THUMBNAIL_SIZE_NORMAL)?"normal":"large",
file,
NULL);
g_free (file);
pixbuf = gdk_pixbuf_new_from_file (path, NULL);
if (pixbuf != NULL)
{
res = gnome_desktop_thumbnail_is_valid (pixbuf, uri, mtime);
g_object_unref (pixbuf);
}
g_checksum_free (checksum);
if (res)
return path;
g_free (path);
return FALSE;
}
/**
* gnome_desktop_thumbnail_factory_has_valid_failed_thumbnail:
* @factory: a #GnomeDesktopThumbnailFactory
* @uri: the uri of a file
* @mtime: the mtime of the file
*
* Tries to locate an failed thumbnail for the file specified. Writing
* and looking for failed thumbnails is important to avoid to try to
* thumbnail e.g. broken images several times.
*
* Usage of this function is threadsafe.
*
* Return value: TRUE if there is a failed thumbnail for the file.
*
* Since: 2.2
**/
gboolean
gnome_desktop_thumbnail_factory_has_valid_failed_thumbnail (GnomeDesktopThumbnailFactory *factory,
const char *uri,
time_t mtime)
{
char *path, *file;
GdkPixbuf *pixbuf;
gboolean res;
GChecksum *checksum;
guint8 digest[16];
gsize digest_len = sizeof (digest);
checksum = g_checksum_new (G_CHECKSUM_MD5);
g_checksum_update (checksum, (const guchar *) uri, strlen (uri));
g_checksum_get_digest (checksum, digest, &digest_len);
g_assert (digest_len == 16);
res = FALSE;
file = g_strconcat (g_checksum_get_string (checksum), ".png", NULL);
path = g_build_filename (g_get_user_cache_dir (),
"thumbnails/fail",
appname,
file,
NULL);
g_free (file);
pixbuf = gdk_pixbuf_new_from_file (path, NULL);
g_free (path);
if (pixbuf)
{
res = gnome_desktop_thumbnail_is_valid (pixbuf, uri, mtime);
g_object_unref (pixbuf);
}
g_checksum_free (checksum);
return res;
}