diff --git a/gdk/gdkregion-generic.c b/gdk/gdkregion-generic.c
index 19e03e45c4..d98dc8822d 100644
--- a/gdk/gdkregion-generic.c
+++ b/gdk/gdkregion-generic.c
@@ -1581,6 +1581,32 @@ gdk_region_equal (const GdkRegion *region1,
   return TRUE;
 }
 
+/**
+ * gdk_region_rect_equal:
+ * @region: a #GdkRegion
+ * @rectangle: a #GdkRectangle
+ *
+ * Finds out if a regions is the same as a rectangle.
+ *
+ * Returns: %TRUE if @region and @rectangle are equal.
+ *
+ * Since: 2.18
+ */
+gboolean
+gdk_region_rect_equal (const GdkRegion    *region,
+		       const GdkRectangle *rectangle)
+{
+  g_return_val_if_fail (region != NULL, FALSE);
+  g_return_val_if_fail (rectangle != NULL, FALSE);
+
+  if (region->numRects != 1) return FALSE;
+  else if (region->extents.x1 != rectangle->x) return FALSE;
+  else if (region->extents.y1 != rectangle->y) return FALSE;
+  else if (region->extents.x2 != rectangle->x + rectangle->width) return FALSE;
+  else if (region->extents.y2 != rectangle->y + rectangle->height) return FALSE;
+  return TRUE;
+}
+
 /**
  * gdk_region_point_in:
  * @region: a #GdkRegion
diff --git a/gdk/gdkregion.h b/gdk/gdkregion.h
index b7381eaf4d..415cd24b77 100644
--- a/gdk/gdkregion.h
+++ b/gdk/gdkregion.h
@@ -77,6 +77,8 @@ void           gdk_region_get_rectangles  (const GdkRegion    *region,
 gboolean       gdk_region_empty           (const GdkRegion    *region);
 gboolean       gdk_region_equal           (const GdkRegion    *region1,
                                            const GdkRegion    *region2);
+gboolean       gdk_region_rect_equal      (const GdkRegion    *region1,
+                                           const GdkRectangle *rectangle);
 gboolean       gdk_region_point_in        (const GdkRegion    *region,
                                            int                 x,
                                            int                 y);