From e7292ecbe2ecee5f5254bec7655da4fc52575ae1 Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Thu, 11 Oct 2012 22:26:59 +0200
Subject: [PATCH] Fixing ArcGISCache layer

This is done by caching the tileOrigin at grid creation time.
---
 lib/OpenLayers/Layer/ArcGISCache.js | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/lib/OpenLayers/Layer/ArcGISCache.js b/lib/OpenLayers/Layer/ArcGISCache.js
index 27173392c4..e52ea645e6 100644
--- a/lib/OpenLayers/Layer/ArcGISCache.js
+++ b/lib/OpenLayers/Layer/ArcGISCache.js
@@ -358,6 +358,17 @@ OpenLayers.Layer.ArcGISCache = OpenLayers.Class(OpenLayers.Layer.XYZ, {
         return OpenLayers.Layer.XYZ.prototype.clone.apply(this, [obj]);
     },
 
+    /**
+     * Method: initGriddedTiles
+     * 
+     * Parameters:
+     * bounds - {<OpenLayers.Bounds>}
+     */
+    initGriddedTiles: function(bounds) {
+        delete this._tileOrigin;
+        OpenLayers.Layer.XYZ.prototype.initGriddedTiles.apply(this, arguments);
+    },
+    
     /**
      * Method: getMaxExtent
      * Get this layer's maximum extent.
@@ -379,8 +390,11 @@ OpenLayers.Layer.ArcGISCache = OpenLayers.Class(OpenLayers.Layer.XYZ, {
      * {<OpenLayers.LonLat>} The tile origin.
      */
     getTileOrigin: function() {
-        var extent = this.getMaxExtent();
-        return new OpenLayers.LonLat(extent.left, extent.bottom);
+        if (!this._tileOrigin) {
+            var extent = this.getMaxExtent();
+            this._tileOrigin = new OpenLayers.LonLat(extent.left, extent.bottom);
+        }
+        return this._tileOrigin;
     },
 
    /**