+/**
+ * get_num_monitors: Get the number of user monitors.
+ * @window: optional GtkWindow to look at.
+ *
+ * Returns: Number of monitors, -1 if uncertain situation (like multiple screens)
+ */
+gint
+get_num_monitors (GtkWindow *window)
+{
+ GdkDisplay *display;
+ GdkScreen *screen;
+ gint num_screen;
+
+ display = gdk_display_get_default ();
+ num_screen = gdk_display_get_n_screens (display);
+
+ if (num_screen != 1)
+ return -1;
+
+ if (window)
+ screen = gtk_window_get_screen (window);
+ else
+ screen = gdk_display_get_screen (display, 0);
+
+ return gdk_screen_get_n_monitors (screen);
+}
+
+gdouble
+get_screen_dpi (GtkWindow *window)
+{
+ GdkScreen *screen;
+ gdouble xdpi, ydpi;
+
+ screen = gtk_window_get_screen (window);
+
+ xdpi = 25.4 * gdk_screen_get_width (screen) / gdk_screen_get_width_mm (screen);
+ ydpi = 25.4 * gdk_screen_get_height (screen) / gdk_screen_get_height_mm (screen);
+
+ return (xdpi + ydpi) / 2.0;
+}
+