Only dirty regions in the MediaOverlay corresponding to its actual media.

Since its dirty regions propagate out to the repaint manager, a big update
there would lead to dirty calls ping-ponging back and forth for a few cycles.



git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@600 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/media/animation/AnimationManager.java

@@ -21,6 +21,8 @@
 
 package com.threerings.media.animation;
 
+import java.util.Iterator;
+
 import com.samskivert.util.SortableArrayList;
 
 import com.threerings.media.AbstractMedia;
@@ -31,6 +33,7 @@ import com.threerings.media.AbstractMediaManager;
  * generating events when animations finish and suchlike.
  */
 public class AnimationManager extends AbstractMediaManager
+    implements Iterable<Animation>
 {
     /**
      * Registers the given {@link Animation} with the animation manager for ticking and painting.
@@ -50,6 +53,11 @@ public class AnimationManager extends AbstractMediaManager
         removeMedia(anim);
     }
 
+    public Iterator<Animation> iterator ()
+    {
+        return _anims.iterator();
+    }
+
     @Override
     protected void tickAllMedia (long tickStamp)
     {