diff --git a/ChangeLog b/ChangeLog
index 041ebda0f..f8d9a65d4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2008-02-15  Tomas Frydrych  <tf@openedhand.com>
+
+	* clutter/clutter-actor.c:
+	* clutter/clutter-actor.h:
+	(clutter_group_query_coords):
+	Added function to translate vertex array to a bounding box.
+
+	(clutter_actor_is_scaled):
+	(clutter_actor_is_rotated):
+	Fixed documentation.
+
 2008-02-15  Tomas Frydrych  <tf@openedhand.com>
 
 	* clutter/clutter-group.c: (clutter_group_query_coords):
diff --git a/clutter/clutter-actor.c b/clutter/clutter-actor.c
index 06ca83ec8..6f262af48 100644
--- a/clutter/clutter-actor.c
+++ b/clutter/clutter-actor.c
@@ -5520,7 +5520,9 @@ clutter_actor_set_shader_param (ClutterActor *self,
  * clutter_actor_is_rotated:
  * @self: a #ClutterActor
  *
- * Returns true if any rotation is applied to the actor.
+ * Checks whether any rotation is applied to the actor.
+ *
+ * Return value: %TRUE if the actor is rotated.
  *
  * Since: 0.6
  */
@@ -5543,7 +5545,9 @@ clutter_actor_is_rotated (ClutterActor *self)
  * clutter_actor_is_scaled:
  * @self: a #ClutterActor
  *
- * Returns true if the actor is scaled in either dimension.
+ * Checks whether the actor is scaled in either dimension.
+ *
+ * Return value: %TRUE if the actor is scaled.
  *
  * Since: 0.6
  */
@@ -5562,3 +5566,55 @@ clutter_actor_is_scaled (ClutterActor *self)
   return FALSE;
 }
 
+/**
+ * clutter_actor_get_box_from_vertices:
+ * @vtx: array of four #ClutterVertex
+ * @box: pointer to #ClutterActorBox where to store the result
+ *
+ * Calculates the bounding box represented by the four vertices; for details
+ * of the vertex array see clutter_actor_get_vertices().
+ *
+ * Since: 0.6
+ */
+void
+clutter_actor_get_box_from_vertices (ClutterVertex    vtx[4],
+				     ClutterActorBox *box)
+{
+  ClutterUnit x1, x2, y1, y2;
+
+  /* 4-way min/max */
+  x1 = vtx[0].x;
+  y1 = vtx[0].y;
+  if (vtx[1].x < x1)
+    x1 = vtx[1].x;
+  if (vtx[2].x < x1)
+    x1 = vtx[2].x;
+  if (vtx[3].x < x1)
+    x1 = vtx[3].x;
+  if (vtx[1].y < y1)
+    y1 = vtx[1].y;
+  if (vtx[2].y < y1)
+    y1 = vtx[2].y;
+  if (vtx[3].y < y1)
+    y1 = vtx[3].y;
+
+  x2 = vtx[0].x;
+  y2 = vtx[0].y;
+  if (vtx[1].x > x2)
+    x2 = vtx[1].x;
+  if (vtx[2].x > x2)
+    x2 = vtx[2].x;
+  if (vtx[3].x > x2)
+    x2 = vtx[3].x;
+  if (vtx[1].y > y2)
+    y2 = vtx[1].y;
+  if (vtx[2].y > y2)
+    y2 = vtx[2].y;
+  if (vtx[3].y > y2)
+    y2 = vtx[3].y;
+
+  box->x1 = x1;
+  box->x2 = x2;
+  box->y1 = y1;
+  box->y2 = y2;
+}
diff --git a/clutter/clutter-actor.h b/clutter/clutter-actor.h
index 5a855d907..4cf39ccd1 100644
--- a/clutter/clutter-actor.h
+++ b/clutter/clutter-actor.h
@@ -461,6 +461,9 @@ gboolean clutter_actor_transform_stage_point          (ClutterActor   *self,
 gboolean clutter_actor_is_rotated                     (ClutterActor   *self);
 gboolean clutter_actor_is_scaled                      (ClutterActor   *self);
 
+void     clutter_actor_get_box_from_vertices          (ClutterVertex    vtx[4],
+				                       ClutterActorBox *box);
+
 G_END_DECLS
 
 #endif /* _HAVE_CLUTTER_ACTOR_H */
diff --git a/clutter/clutter-group.c b/clutter/clutter-group.c
index b49f1cff9..03b428343 100644
--- a/clutter/clutter-group.c
+++ b/clutter/clutter-group.c
@@ -148,49 +148,6 @@ clutter_group_request_coords (ClutterActor    *self,
   CLUTTER_ACTOR_CLASS (clutter_group_parent_class)->request_coords (self, box);
 }
 
-static void
-clutter_group_get_box_from_vertices (ClutterActorBox *box,
-				     ClutterVertex    vtx[4])
-{
-  ClutterUnit x1, x2, y1, y2;
-
-  /* 4-way min/max */
-  x1 = vtx[0].x;
-  y1 = vtx[0].y;
-  if (vtx[1].x < x1)
-    x1 = vtx[1].x;
-  if (vtx[2].x < x1)
-    x1 = vtx[2].x;
-  if (vtx[3].x < x1)
-    x1 = vtx[3].x;
-  if (vtx[1].y < y1)
-    y1 = vtx[1].y;
-  if (vtx[2].y < y1)
-    y1 = vtx[2].y;
-  if (vtx[3].y < y1)
-    y1 = vtx[3].y;
-
-  x2 = vtx[0].x;
-  y2 = vtx[0].y;
-  if (vtx[1].x > x2)
-    x2 = vtx[1].x;
-  if (vtx[2].x > x2)
-    x2 = vtx[2].x;
-  if (vtx[3].x > x2)
-    x2 = vtx[3].x;
-  if (vtx[1].y > y2)
-    y2 = vtx[1].y;
-  if (vtx[2].y > y2)
-    y2 = vtx[2].y;
-  if (vtx[3].y > y2)
-    y2 = vtx[3].y;
-
-  box->x1 = x1;
-  box->x2 = x2;
-  box->y1 = y1;
-  box->y2 = y2;
-}
-
 static void
 clutter_group_query_coords (ClutterActor        *self,
 			    ClutterActorBox     *box)
@@ -220,7 +177,7 @@ clutter_group_query_coords (ClutterActor        *self,
 	      ClutterVertex vtx[4];
 
 	      clutter_actor_get_relative_vertices (child, self, vtx);
-	      clutter_group_get_box_from_vertices (&cbox, vtx);
+	      clutter_actor_get_box_from_vertices (vtx, &cbox);
 	    }
 	  else
 #endif