Added support for obtaining estimated memory usage of a tile; modified

tile cache to be based on memory usage rather than tile count.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@2175 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/tile/Tile.java

@@ -1,5 +1,5 @@
 //
-// $Id: Tile.java,v 1.26 2003/01/13 22:49:46 mdb Exp $
+// $Id: Tile.java,v 1.27 2003/01/17 02:30:50 mdb Exp $
 
 package com.threerings.media.tile;
 
@@ -39,6 +39,14 @@ public class Tile implements Cloneable
         return _mirage.getHeight();
     }
 
+    /**
+     * Returns the estimated memory usage of our underlying tile image.
+     */
+    public long getEstimatedMemoryUsage ()
+    {
+        return _mirage.getEstimatedMemoryUsage();
+    }
+
     /**
      * Render the tile image at the specified position in the given
      * graphics context.