Reuse ol.TileRange object in forEachTileCoordParentTileRange

src/ol/tilegrid/xyztilegrid.js

@@ -39,18 +39,11 @@ goog.inherits(ol.tilegrid.XYZ, ol.tilegrid.TileGrid);
  */
 ol.tilegrid.XYZ.prototype.forEachTileCoordParentTileRange =
     function(tileCoord, callback, opt_obj) {
-  var x = tileCoord.x;
-  var y = tileCoord.y;
-  var z = tileCoord.z;
-  var tileRange;
-  while (true) {
-    z -= 1;
-    if (z < 0) {
-      break;
-    }
-    x >>= 1;
-    y >>= 1;
-    tileRange = new ol.TileRange(x, y, x, y);
+  var tileRange = new ol.TileRange(0, 0, tileCoord.x, tileCoord.y);
+  var z;
+  for (z = tileCoord.z - 1; z >= 0; --z) {
+    tileRange.minX = tileRange.maxX >>= 1;
+    tileRange.minY = tileRange.maxY >>= 1;
     if (callback.call(opt_obj, z, tileRange)) {
       break;
     }

src/ol/tilerange.js

@@ -64,6 +64,14 @@ ol.TileRange.boundingTileRange = function(var_args) {
 };
 
 
+/**
+ * @return {ol.TileRange} Clone.
+ */
+ol.TileRange.prototype.clone = function() {
+  return new ol.TileRange(this.minX, this.minY, this.maxX, this.maxY);
+};
+
+
 /**
  * @param {ol.TileCoord} tileCoord Tile coordinate.
  * @return {boolean} Contains tile coordinate.

test/spec/ol/source/xyz.test.js

@@ -86,7 +86,7 @@ describe('ol.source.XYZ', function() {
           tileCoord,
           function(z, tileRange) {
             zs.push(z);
-            tileRanges.push(tileRange);
+            tileRanges.push(tileRange.clone());
             return false;
           });