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-rw-r--r--src/nautilus-thumbnails.c560
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diff --git a/src/nautilus-thumbnails.c b/src/nautilus-thumbnails.c
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+/*
+ * nautilus-thumbnails.h: Thumbnail code for icon factory.
+ *
+ * Copyright (C) 2000, 2001 Eazel, Inc.
+ * Copyright (C) 2002, 2003 Red Hat, Inc.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Andy Hertzfeld <andy@eazel.com>
+ */
+
+#include <config.h>
+#include "nautilus-thumbnails.h"
+
+#define GNOME_DESKTOP_USE_UNSTABLE_API
+
+#include "nautilus-directory-notify.h"
+#include "nautilus-global-preferences.h"
+#include "nautilus-file-utilities.h"
+#include <math.h>
+#include <eel/eel-graphic-effects.h>
+#include <eel/eel-string.h>
+#include <eel/eel-debug.h>
+#include <eel/eel-vfs-extensions.h>
+#include <gtk/gtk.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <signal.h>
+#include <libgnome-desktop/gnome-desktop-thumbnail.h>
+#define DEBUG_FLAG NAUTILUS_DEBUG_THUMBNAILS
+#include "nautilus-debug.h"
+
+#include "nautilus-file-private.h"
+
+/* Should never be a reasonable actual mtime */
+#define INVALID_MTIME 0
+
+/* Cool-off period between last file modification time and thumbnail creation */
+#define THUMBNAIL_CREATION_DELAY_SECS 3
+
+static void thumbnail_thread_func (GTask *task,
+ gpointer source_object,
+ gpointer task_data,
+ GCancellable *cancellable);
+
+/* structure used for making thumbnails, associating a uri with where the thumbnail is to be stored */
+
+typedef struct
+{
+ char *image_uri;
+ char *mime_type;
+ time_t original_file_mtime;
+} NautilusThumbnailInfo;
+
+/*
+ * Thumbnail thread state.
+ */
+
+/* The id of the idle handler used to start the thumbnail thread, or 0 if no
+ * idle handler is currently registered. */
+static guint thumbnail_thread_starter_id = 0;
+
+/* Our mutex used when accessing data shared between the main thread and the
+ * thumbnail thread, i.e. the thumbnail_thread_is_running flag and the
+ * thumbnails_to_make list. */
+static GMutex thumbnails_mutex;
+
+/* A flag to indicate whether a thumbnail thread is running, so we don't
+ * start more than one. Lock thumbnails_mutex when accessing this. */
+static volatile gboolean thumbnail_thread_is_running = FALSE;
+
+/* The list of NautilusThumbnailInfo structs containing information about the
+ * thumbnails we are making. Lock thumbnails_mutex when accessing this. */
+static volatile GQueue thumbnails_to_make = G_QUEUE_INIT;
+
+/* Quickly check if uri is in thumbnails_to_make list */
+static GHashTable *thumbnails_to_make_hash = NULL;
+
+/* The currently thumbnailed icon. it also exists in the thumbnails_to_make list
+ * to avoid adding it again. Lock thumbnails_mutex when accessing this. */
+static NautilusThumbnailInfo *currently_thumbnailing = NULL;
+
+static gboolean
+get_file_mtime (const char *file_uri,
+ time_t *mtime)
+{
+ GFile *file;
+ GFileInfo *info;
+ gboolean ret;
+
+ ret = FALSE;
+ *mtime = INVALID_MTIME;
+
+ file = g_file_new_for_uri (file_uri);
+ info = g_file_query_info (file, G_FILE_ATTRIBUTE_TIME_MODIFIED, 0, NULL, NULL);
+ if (info)
+ {
+ if (g_file_info_has_attribute (info, G_FILE_ATTRIBUTE_TIME_MODIFIED))
+ {
+ *mtime = g_file_info_get_attribute_uint64 (info, G_FILE_ATTRIBUTE_TIME_MODIFIED);
+ ret = TRUE;
+ }
+
+ g_object_unref (info);
+ }
+ g_object_unref (file);
+
+ return ret;
+}
+
+static void
+free_thumbnail_info (NautilusThumbnailInfo *info)
+{
+ g_free (info->image_uri);
+ g_free (info->mime_type);
+ g_free (info);
+}
+
+static GnomeDesktopThumbnailFactory *
+get_thumbnail_factory (void)
+{
+ static GnomeDesktopThumbnailFactory *thumbnail_factory = NULL;
+
+ if (thumbnail_factory == NULL)
+ {
+ thumbnail_factory = gnome_desktop_thumbnail_factory_new (GNOME_DESKTOP_THUMBNAIL_SIZE_LARGE);
+ }
+
+ return thumbnail_factory;
+}
+
+
+/* This function is added as a very low priority idle function to start the
+ * thread to create any needed thumbnails. It is added with a very low priority
+ * so that it doesn't delay showing the directory in the icon/list views.
+ * We want to show the files in the directory as quickly as possible. */
+static gboolean
+thumbnail_thread_starter_cb (gpointer data)
+{
+ GTask *task;
+
+ DEBUG ("(Main Thread) Creating thumbnails thread\n");
+
+ /* We set a flag to indicate the thread is running, so we don't create
+ * a new one. We don't need to lock a mutex here, as the thumbnail
+ * thread isn't running yet. And we know we won't create the thread
+ * twice, as we also check thumbnail_thread_starter_id before
+ * scheduling this idle function. */
+ thumbnail_thread_is_running = TRUE;
+ task = g_task_new (NULL, NULL, NULL, NULL);
+ g_task_run_in_thread (task, thumbnail_thread_func);
+ thumbnail_thread_starter_id = 0;
+
+ g_object_unref (task);
+
+ return FALSE;
+}
+
+void
+nautilus_thumbnail_remove_from_queue (const char *file_uri)
+{
+ GList *node;
+
+ DEBUG ("(Remove from queue) Locking mutex\n");
+
+ g_mutex_lock (&thumbnails_mutex);
+
+ /*********************************
+ * MUTEX LOCKED
+ *********************************/
+
+ if (thumbnails_to_make_hash)
+ {
+ node = g_hash_table_lookup (thumbnails_to_make_hash, file_uri);
+
+ if (node && node->data != currently_thumbnailing)
+ {
+ g_hash_table_remove (thumbnails_to_make_hash, file_uri);
+ free_thumbnail_info (node->data);
+ g_queue_delete_link ((GQueue *) &thumbnails_to_make, node);
+ }
+ }
+
+ /*********************************
+ * MUTEX UNLOCKED
+ *********************************/
+
+ DEBUG ("(Remove from queue) Unlocking mutex\n");
+
+ g_mutex_unlock (&thumbnails_mutex);
+}
+
+void
+nautilus_thumbnail_prioritize (const char *file_uri)
+{
+ GList *node;
+
+ DEBUG ("(Prioritize) Locking mutex\n");
+
+ g_mutex_lock (&thumbnails_mutex);
+
+ /*********************************
+ * MUTEX LOCKED
+ *********************************/
+
+ if (thumbnails_to_make_hash)
+ {
+ node = g_hash_table_lookup (thumbnails_to_make_hash, file_uri);
+
+ if (node && node->data != currently_thumbnailing)
+ {
+ g_queue_unlink ((GQueue *) &thumbnails_to_make, node);
+ g_queue_push_head_link ((GQueue *) &thumbnails_to_make, node);
+ }
+ }
+
+ /*********************************
+ * MUTEX UNLOCKED
+ *********************************/
+
+ DEBUG ("(Prioritize) Unlocking mutex\n");
+
+ g_mutex_unlock (&thumbnails_mutex);
+}
+
+
+/***************************************************************************
+ * Thumbnail Thread Functions.
+ ***************************************************************************/
+
+
+/* This is a one-shot idle callback called from the main loop to call
+ * notify_file_changed() for a thumbnail. It frees the uri afterwards.
+ * We do this in an idle callback as I don't think nautilus_file_changed() is
+ * thread-safe. */
+static gboolean
+thumbnail_thread_notify_file_changed (gpointer image_uri)
+{
+ NautilusFile *file;
+
+ file = nautilus_file_get_by_uri ((char *) image_uri);
+
+ DEBUG ("(Thumbnail Thread) Notifying file changed file:%p uri: %s\n", file, (char *) image_uri);
+
+ if (file != NULL)
+ {
+ nautilus_file_set_is_thumbnailing (file, FALSE);
+ nautilus_file_invalidate_attributes (file,
+ NAUTILUS_FILE_ATTRIBUTE_THUMBNAIL |
+ NAUTILUS_FILE_ATTRIBUTE_INFO);
+ nautilus_file_unref (file);
+ }
+ g_free (image_uri);
+
+ return FALSE;
+}
+
+static GHashTable *
+get_types_table (void)
+{
+ static GHashTable *image_mime_types = NULL;
+ GSList *format_list, *l;
+ char **types;
+ int i;
+
+ if (image_mime_types == NULL)
+ {
+ image_mime_types =
+ g_hash_table_new_full (g_str_hash, g_str_equal,
+ g_free, NULL);
+
+ format_list = gdk_pixbuf_get_formats ();
+ for (l = format_list; l; l = l->next)
+ {
+ types = gdk_pixbuf_format_get_mime_types (l->data);
+
+ for (i = 0; types[i] != NULL; i++)
+ {
+ g_hash_table_insert (image_mime_types,
+ types [i],
+ GUINT_TO_POINTER (1));
+ }
+
+ g_free (types);
+ }
+
+ g_slist_free (format_list);
+ }
+
+ return image_mime_types;
+}
+
+static gboolean
+pixbuf_can_load_type (const char *mime_type)
+{
+ GHashTable *image_mime_types;
+
+ image_mime_types = get_types_table ();
+ if (g_hash_table_lookup (image_mime_types, mime_type))
+ {
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+gboolean
+nautilus_thumbnail_is_mimetype_limited_by_size (const char *mime_type)
+{
+ return pixbuf_can_load_type (mime_type);
+}
+
+gboolean
+nautilus_can_thumbnail (NautilusFile *file)
+{
+ GnomeDesktopThumbnailFactory *factory;
+ gboolean res;
+ char *uri;
+ time_t mtime;
+ char *mime_type;
+
+ uri = nautilus_file_get_uri (file);
+ mime_type = nautilus_file_get_mime_type (file);
+ mtime = nautilus_file_get_mtime (file);
+
+ factory = get_thumbnail_factory ();
+ res = gnome_desktop_thumbnail_factory_can_thumbnail (factory,
+ uri,
+ mime_type,
+ mtime);
+ g_free (mime_type);
+ g_free (uri);
+
+ return res;
+}
+
+void
+nautilus_create_thumbnail (NautilusFile *file)
+{
+ time_t file_mtime = 0;
+ NautilusThumbnailInfo *info;
+ NautilusThumbnailInfo *existing_info;
+ GList *existing, *node;
+
+ nautilus_file_set_is_thumbnailing (file, TRUE);
+
+ info = g_new0 (NautilusThumbnailInfo, 1);
+ info->image_uri = nautilus_file_get_uri (file);
+ info->mime_type = nautilus_file_get_mime_type (file);
+
+ /* Hopefully the NautilusFile will already have the image file mtime,
+ * so we can just use that. Otherwise we have to get it ourselves. */
+ if (file->details->got_file_info &&
+ file->details->file_info_is_up_to_date &&
+ file->details->mtime != 0)
+ {
+ file_mtime = file->details->mtime;
+ }
+ else
+ {
+ get_file_mtime (info->image_uri, &file_mtime);
+ }
+
+ info->original_file_mtime = file_mtime;
+
+
+ DEBUG ("(Main Thread) Locking mutex\n");
+
+ g_mutex_lock (&thumbnails_mutex);
+
+ /*********************************
+ * MUTEX LOCKED
+ *********************************/
+
+ if (thumbnails_to_make_hash == NULL)
+ {
+ thumbnails_to_make_hash = g_hash_table_new (g_str_hash,
+ g_str_equal);
+ }
+
+ /* Check if it is already in the list of thumbnails to make. */
+ existing = g_hash_table_lookup (thumbnails_to_make_hash, info->image_uri);
+ if (existing == NULL)
+ {
+ /* Add the thumbnail to the list. */
+ DEBUG ("(Main Thread) Adding thumbnail: %s\n",
+ info->image_uri);
+ g_queue_push_tail ((GQueue *) &thumbnails_to_make, info);
+ node = g_queue_peek_tail_link ((GQueue *) &thumbnails_to_make);
+ g_hash_table_insert (thumbnails_to_make_hash,
+ info->image_uri,
+ node);
+ /* If the thumbnail thread isn't running, and we haven't
+ * scheduled an idle function to start it up, do that now.
+ * We don't want to start it until all the other work is done,
+ * so the GUI will be updated as quickly as possible.*/
+ if (thumbnail_thread_is_running == FALSE &&
+ thumbnail_thread_starter_id == 0)
+ {
+ thumbnail_thread_starter_id = g_idle_add_full (G_PRIORITY_LOW, thumbnail_thread_starter_cb, NULL, NULL);
+ }
+ }
+ else
+ {
+ DEBUG ("(Main Thread) Updating non-current mtime: %s\n",
+ info->image_uri);
+
+ /* The file in the queue might need a new original mtime */
+ existing_info = existing->data;
+ existing_info->original_file_mtime = info->original_file_mtime;
+ free_thumbnail_info (info);
+ }
+
+ /*********************************
+ * MUTEX UNLOCKED
+ *********************************/
+
+ DEBUG ("(Main Thread) Unlocking mutex\n");
+
+ g_mutex_unlock (&thumbnails_mutex);
+}
+
+/* thumbnail_thread is invoked as a separate thread to to make thumbnails. */
+static void
+thumbnail_thread_func (GTask *task,
+ gpointer source_object,
+ gpointer task_data,
+ GCancellable *cancellable)
+{
+ GnomeDesktopThumbnailFactory *thumbnail_factory;
+ NautilusThumbnailInfo *info = NULL;
+ GdkPixbuf *pixbuf;
+ time_t current_orig_mtime = 0;
+ time_t current_time;
+ GList *node;
+
+ thumbnail_factory = get_thumbnail_factory ();
+
+ /* We loop until there are no more thumbails to make, at which point
+ * we exit the thread. */
+ for (;;)
+ {
+ DEBUG ("(Thumbnail Thread) Locking mutex\n");
+
+ g_mutex_lock (&thumbnails_mutex);
+
+ /*********************************
+ * MUTEX LOCKED
+ *********************************/
+
+ /* Pop the last thumbnail we just made off the head of the
+ * list and free it. I did this here so we only have to lock
+ * the mutex once per thumbnail, rather than once before
+ * creating it and once after.
+ * Don't pop the thumbnail off the queue if the original file
+ * mtime of the request changed. Then we need to redo the thumbnail.
+ */
+ if (currently_thumbnailing &&
+ currently_thumbnailing->original_file_mtime == current_orig_mtime)
+ {
+ g_assert (info == currently_thumbnailing);
+ node = g_hash_table_lookup (thumbnails_to_make_hash, info->image_uri);
+ g_assert (node != NULL);
+ g_hash_table_remove (thumbnails_to_make_hash, info->image_uri);
+ free_thumbnail_info (info);
+ g_queue_delete_link ((GQueue *) &thumbnails_to_make, node);
+ }
+ currently_thumbnailing = NULL;
+
+ /* If there are no more thumbnails to make, reset the
+ * thumbnail_thread_is_running flag, unlock the mutex, and
+ * exit the thread. */
+ if (g_queue_is_empty ((GQueue *) &thumbnails_to_make))
+ {
+ DEBUG ("(Thumbnail Thread) Exiting\n");
+
+ thumbnail_thread_is_running = FALSE;
+ g_mutex_unlock (&thumbnails_mutex);
+ return;
+ }
+
+ /* Get the next one to make. We leave it on the list until it
+ * is created so the main thread doesn't add it again while we
+ * are creating it. */
+ info = g_queue_peek_head ((GQueue *) &thumbnails_to_make);
+ currently_thumbnailing = info;
+ current_orig_mtime = info->original_file_mtime;
+ /*********************************
+ * MUTEX UNLOCKED
+ *********************************/
+
+ DEBUG ("(Thumbnail Thread) Unlocking mutex\n");
+
+ g_mutex_unlock (&thumbnails_mutex);
+
+ time (&current_time);
+
+ /* Don't try to create a thumbnail if the file was modified recently.
+ * This prevents constant re-thumbnailing of changing files. */
+ if (current_time < current_orig_mtime + THUMBNAIL_CREATION_DELAY_SECS &&
+ current_time >= current_orig_mtime)
+ {
+ DEBUG ("(Thumbnail Thread) Skipping: %s\n",
+ info->image_uri);
+
+ /* Reschedule thumbnailing via a change notification */
+ g_timeout_add_seconds (1, thumbnail_thread_notify_file_changed,
+ g_strdup (info->image_uri));
+ continue;
+ }
+
+ /* Create the thumbnail. */
+ DEBUG ("(Thumbnail Thread) Creating thumbnail: %s\n",
+ info->image_uri);
+
+ pixbuf = gnome_desktop_thumbnail_factory_generate_thumbnail (thumbnail_factory,
+ info->image_uri,
+ info->mime_type);
+
+ if (pixbuf)
+ {
+ DEBUG ("(Thumbnail Thread) Saving thumbnail: %s\n",
+ info->image_uri);
+
+ gnome_desktop_thumbnail_factory_save_thumbnail (thumbnail_factory,
+ pixbuf,
+ info->image_uri,
+ current_orig_mtime);
+ g_object_unref (pixbuf);
+ }
+ else
+ {
+ DEBUG ("(Thumbnail Thread) Thumbnail failed: %s\n",
+ info->image_uri);
+
+ gnome_desktop_thumbnail_factory_create_failed_thumbnail (thumbnail_factory,
+ info->image_uri,
+ current_orig_mtime);
+ }
+ /* We need to call nautilus_file_changed(), but I don't think that is
+ * thread safe. So add an idle handler and do it from the main loop. */
+ g_idle_add_full (G_PRIORITY_HIGH_IDLE,
+ thumbnail_thread_notify_file_changed,
+ g_strdup (info->image_uri), NULL);
+ }
+}