[gthumb] desktop background: use the stretched option in some cases

[Paolo Bacchilega <paobac src gnome org>]

commit 8088b7634645ca0e52bd5c3507bfe37ffdbe2f6e
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Mar 23 18:43:55 2014 +0100

    desktop background: use the stretched option in some cases
    
    [bug #726708]

 extensions/desktop_background/actions.c |   63 ++++++++++++++++++++++++++++++-
 1 files changed, 62 insertions(+), 1 deletions(-)
---
diff --git a/extensions/desktop_background/actions.c b/extensions/desktop_background/actions.c
index 1f4b842..98edbb3 100644
--- a/extensions/desktop_background/actions.c
+++ b/extensions/desktop_background/actions.c
@@ -220,7 +220,7 @@ infobar_response_cb (GtkInfoBar *info_bar,
 
 
 static void
-wallpaper_data_set (WallpaperData *wdata)
+wallpaper_data_set__step2 (WallpaperData *wdata)
 {
        GtkWidget *infobar;
 
@@ -262,6 +262,67 @@ wallpaper_data_set (WallpaperData *wdata)
 
 
 static void
+wallpaper_metadata_ready_cb (GObject      *source_object,
+                            GAsyncResult *result,
+                            gpointer      user_data)
+{
+       WallpaperData *wdata = user_data;
+       GList         *file_list;
+       GError        *error = NULL;
+       GdkScreen     *screen;
+
+       file_list = _g_query_metadata_finish (result, &error);
+       if (error != NULL) {
+               _gtk_error_dialog_from_gerror_run (GTK_WINDOW (wdata->browser), _("Could not set the desktop 
background"), error);
+               wallpaper_data_free (wdata);
+               return;
+       }
+
+       /* WALLPAPER handles most of the cases correctly */
+
+       wdata->new_style.background_style = BACKGROUND_STYLE_WALLPAPER;
+
+       screen = gtk_widget_get_screen (GTK_WIDGET (wdata->browser));
+       if (gdk_screen_get_n_monitors (screen) == 1) {
+               GthFileData *file_data;
+               int          image_width;
+               int          image_height;
+               int          screen_width;
+               int          screen_height;
+
+               file_data = file_list->data;
+               image_width = g_file_info_get_attribute_int32 (file_data->info, "image::width");
+               image_height = g_file_info_get_attribute_int32 (file_data->info, "image::height");
+               screen_width = gdk_screen_get_width (screen);
+               screen_height = gdk_screen_get_height (screen);
+
+               if ((image_width < screen_width) || (image_height < screen_height)) {
+                       if ((image_width >= screen_width / 2) && (image_height >= screen_height / 2))
+                               wdata->new_style.background_style = BACKGROUND_STYLE_STRETCHED;
+               }
+       }
+
+       wallpaper_data_set__step2 (wdata);
+}
+
+
+static void
+wallpaper_data_set (WallpaperData *wdata)
+{
+       GList *file_list;
+
+       file_list = g_list_append (NULL, gth_file_data_new (wdata->new_style.file, NULL));
+       _g_query_metadata_async (file_list,
+                                "image::width,image::height",
+                                NULL,
+                                wallpaper_metadata_ready_cb,
+                                wdata);
+
+       _g_object_list_unref (file_list);
+}
+
+
+static void
 save_wallpaper_task_completed_cb (GthTask  *task,
                                  GError   *error,
                                  gpointer  user_data)