diff --git a/clutter/clutter-stage-window.c b/clutter/clutter-stage-window.c
index c6c9f1ad8..450d264a1 100644
--- a/clutter/clutter-stage-window.c
+++ b/clutter/clutter-stage-window.c
@@ -333,3 +333,30 @@ _clutter_stage_window_can_clip_redraws (ClutterStageWindow *window)
 
   return FALSE;
 }
+
+void
+_clutter_stage_window_set_scale_factor (ClutterStageWindow *window,
+                                        int                 factor)
+{
+  ClutterStageWindowIface *iface;
+
+  g_return_if_fail (CLUTTER_IS_STAGE_WINDOW (window));
+
+  iface = CLUTTER_STAGE_WINDOW_GET_IFACE (window);
+  if (iface->set_scale_factor != NULL)
+    iface->set_scale_factor (window, factor);
+}
+
+int
+_clutter_stage_window_get_scale_factor (ClutterStageWindow *window)
+{
+  ClutterStageWindowIface *iface;
+
+  g_return_val_if_fail (CLUTTER_IS_STAGE_WINDOW (window), 1);
+
+  iface = CLUTTER_STAGE_WINDOW_GET_IFACE (window);
+  if (iface->get_scale_factor != NULL)
+    return iface->get_scale_factor (window);
+
+  return 1;
+}
diff --git a/clutter/clutter-stage-window.h b/clutter/clutter-stage-window.h
index 9b38994cc..c6233d1bc 100644
--- a/clutter/clutter-stage-window.h
+++ b/clutter/clutter-stage-window.h
@@ -84,6 +84,10 @@ struct _ClutterStageWindowIface
   CoglFramebuffer  *(* get_active_framebuffer)  (ClutterStageWindow *stage_window);
 
   gboolean          (* can_clip_redraws)        (ClutterStageWindow *stage_window);
+
+  void              (* set_scale_factor)        (ClutterStageWindow *stage_window,
+                                                 int                 factor);
+  int               (* get_scale_factor)        (ClutterStageWindow *stage_window);
 };
 
 GType _clutter_stage_window_get_type (void) G_GNUC_CONST;
@@ -137,6 +141,10 @@ CoglFramebuffer  *_clutter_stage_window_get_active_framebuffer  (ClutterStageWin
 
 gboolean          _clutter_stage_window_can_clip_redraws        (ClutterStageWindow *window);
 
+void              _clutter_stage_window_set_scale_factor        (ClutterStageWindow *window,
+                                                                 int                 factor);
+int               _clutter_stage_window_get_scale_factor        (ClutterStageWindow *window);
+
 G_END_DECLS
 
 #endif /* __CLUTTER_STAGE_WINDOW_H__ */