Use paint instead of getSnapshot on underlying mirages in composite mirage as it might save us creating an image object.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4092 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/image/CompositeMirage.java

@@ -60,8 +60,7 @@ public class CompositeMirage implements Mirage
 
         try {
             for (Mirage m : _mirages) {
-                BufferedImage snap = m.getSnapshot();
-                gfx.drawImage(snap, 0, 0, null);
+                m.paint(gfx, 0, 0);
             }
         } finally {
             gfx.dispose();