Keep track of whether or not anything was painted each frame and avoid the

extra effort of copying the back buffer to the screen if nothing actually
changed.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@2322 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/FrameParticipant.java

@@ -1,5 +1,5 @@
 //
-// $Id: FrameParticipant.java,v 1.2 2002/06/18 22:25:33 mdb Exp $
+// $Id: FrameParticipant.java,v 1.3 2003/03/25 19:06:54 mdb Exp $
 
 package com.threerings.media;
 
@@ -20,6 +20,13 @@ public interface FrameParticipant
      */
     public void tick (long tickStamp);
 
+    /**
+     * Called immediately prior to {@link #getComponent} and then {@link
+     * Component#paint} on said component, to determine whether or not
+     * this frame participant needs to be painted.
+     */
+    public boolean needsPaint ();
+
     /**
      * If a frame participant wishes also to be actively rendered every
      * frame rather than use passive rendering (which for Swing, at least,