Remove extra tiles.

src/ol/source/zoomifysource.js

@@ -159,7 +159,7 @@ ol.source.Zoomify = function(options) {
     resolutions: resolutions
   });
   var tileUrlFunction = ol.TileUrlFunction.withTileCoordTransform(
-      tileGrid.createTileCoordTransform(),
+      tileGrid.createTileCoordTransform({extent: [0, 0].concat(this.size_)}),
       createFromUrl(this.url_));
 
 

src/ol/tilegrid/zoomifytilegrid.js

@@ -68,7 +68,7 @@ ol.tilegrid.Zoomify.prototype.createTileCoordTransform = function(opt_options) {
         if (!goog.isNull(tileRangeByZ)) {
           tmpTileCoord.z = z;
           tmpTileCoord.x = x;
-          tmpTileCoord.y = y;
+          tmpTileCoord.y = -y - 1;
           if (!tileRangeByZ[z].contains(tmpTileCoord)) {
             return null;
           }