Let the tile data pack cache images so we aren't reloading them for various individual tiles within the image. Also, a couple minor efficiency improvements elsewhere.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@949 ed5b42cb-e716-0410-a449-f6a68f950b19

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

@@ -36,7 +36,10 @@ import nochump.util.zip.ZipFile;
 
 import com.threerings.media.image.PngRecolorUtil;
 import com.threerings.util.DataPack;
+import com.threerings.util.Map;
+import com.threerings.util.Maps;
 import com.threerings.util.MultiLoader;
+import com.threerings.util.StringUtil;
 
 /**
  * Like a normal data pack, but we don't deal with any data, and all our filenames are a direct
@@ -86,7 +89,17 @@ public class TileDataPack extends DataPack
 
     public function getTileSetImage (path :String, zations :Array, callback :Function) :void
     {
-        MultiLoader.getContents(PngRecolorUtil.recolorPNG(getFile(path), zations), callback);
+        var key :String = zations == null ? path : path + ":" + StringUtil.toString(zations);
+
+        if (_cache.containsKey(key)) {
+            callback(_cache.get(key));
+        } else {
+            MultiLoader.getContents(PngRecolorUtil.recolorPNG(getFile(path), zations),
+                function(result :Bitmap) :void {
+                    _cache.put(key, result);
+                    callback(result);
+                });
+        }
     }
 
     public function getTileImage (path :String, bounds :Rectangle, zations :Array,
@@ -99,5 +112,8 @@ public class TileDataPack extends DataPack
             callback(new Bitmap(data));
         });
     }
+
+    /** Cache of images loaded from this data pack. */
+    protected var _cache :Map = Maps.newMapOf(String);
 }
 }

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

@@ -166,7 +166,7 @@ public /* abstract */ class TileSet
         // if it's not in the active set, it's not in memory; so load it
         if (tile == null) {
             tile = createTile();
-            tile.key = new Tile_Key(this, tileIndex, zations);
+            tile.key = key;
             initTile(tile, tileIndex, zations);
             _atiles.put(tile.key, tile);
         }

src/as/com/threerings/miso/client/MisoScenePanel.as

@@ -272,8 +272,6 @@ public class MisoScenePanel extends Sprite
         _objScene.layoutRenderer = new ClassFactory(PrioritizedSceneLayoutRenderer);
 
         refreshBaseBlockScenes();
-
-        _isoView.addScene(_objScene);
     }
 
     /**

src/as/com/threerings/miso/client/SceneBlock.as

@@ -73,6 +73,7 @@ public class SceneBlock
         var y :int = getBlockY(_key);
 
         _baseScene = new IsoScene();
+        _baseScene.layoutEnabled = false;
         for (var ii :int = x; ii < x + BLOCK_SIZE; ii++) {
             for (var jj :int = y; jj < y + BLOCK_SIZE; jj++) {
                 var tileId :int = model.getBaseTileId(ii, jj);