We need a separate bitmap because we can only include each bitmap once in the window, but we can go ahead and share the underlying data.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@944 ed5b42cb-e716-0410-a449-f6a68f950b19

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

@@ -45,9 +45,7 @@ public class Tile
     {
         if (_image is Bitmap) {
             // TODO - handle this more consistently...
-            var data :BitmapData = new BitmapData(_image.width, _image.height, true, 0x00000000);
-            data.draw(_image);
-            return new Bitmap(data);
+            return new Bitmap(Bitmap(_image).bitmapData);
         } else {
             return _image;
         }