Changing/fixing the meaning of getServerZoom.

If a layer is configured with serverResolutions, then getServerZoom should return the zoom level as index of the current resolution in the serverResolutions array.

lib/OpenLayers/Layer/Grid.js

@@ -658,7 +658,10 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      * {Number} The closest server supported zoom.
      */
     getServerZoom: function() {
-        return this.map.getZoomForResolution(this.getServerResolution());
+        var serverResolution = this.getServerResolution();
+        return this.serverResolutions ?
+            this.serverResolutions.indexOf(serverResolution) :
+            this.map.getZoomForResolution(serverResolution);
     },
 
     /**

lib/OpenLayers/Layer/TMS.js

@@ -173,9 +173,7 @@ OpenLayers.Layer.TMS = OpenLayers.Class(OpenLayers.Layer.Grid, {
         var res = this.getServerResolution();
         var x = Math.round((bounds.left - this.tileOrigin.lon) / (res * this.tileSize.w));
         var y = Math.round((bounds.bottom - this.tileOrigin.lat) / (res * this.tileSize.h));
-        var z = this.serverResolutions != null ?
+        var z = this.getServerZoom() + (this.zoomOffset || 0);
-            OpenLayers.Util.indexOf(this.serverResolutions, res) :
-            this.getServerZoom() + this.zoomOffset;
         var path = this.serviceVersion + "/" + this.layername + "/" + z + "/" + x + "/" + y + "." + this.type; 
         var url = this.url;
         if (OpenLayers.Util.isArray(url)) {

lib/OpenLayers/Layer/WMTS.js

@@ -332,10 +332,7 @@ OpenLayers.Layer.WMTS = OpenLayers.Class(OpenLayers.Layer.Grid, {
      * Get the current index in the matrixIds array.
      */
     getIdentifier: function() {
-        return this.serverResolutions != null ?
+        return this.getServerZoom() + (this.zoomOffset || 0);
-            OpenLayers.Util.indexOf(this.serverResolutions,
-                                    this.getServerResolution()) :
-            this.getServerZoom() + this.zoomOffset;
     },
     
     /**

lib/OpenLayers/Layer/XYZ.js

@@ -143,10 +143,7 @@ OpenLayers.Layer.XYZ = OpenLayers.Class(OpenLayers.Layer.Grid, {
             (res * this.tileSize.w));
         var y = Math.round((this.maxExtent.top - bounds.top) /
             (res * this.tileSize.h));
-        var resolutions = this.serverResolutions || this.resolutions;
+        var z = this.getServerZoom() + (this.zoomOffset || 0);
-        var z = this.zoomOffset == 0 ?
-            OpenLayers.Util.indexOf(resolutions, res) :
-            this.getServerZoom() + this.zoomOffset;
 
         if (this.wrapDateLine) {
             var limit = Math.pow(2, z);

tests/Layer/Grid.html

@@ -837,12 +837,12 @@
         layer.serverResolutions = [2, 1];
         resolution = 1;
         zoom = layer.getServerZoom();
-        t.eq(zoom, 3, '[3] getServerZoom return value is correct');
+        t.eq(zoom, 1, '[3] getServerZoom return value is correct');
 
         layer.serverResolutions = [2];
         resolution = 0.5;
         zoom = layer.getServerZoom();
-        t.eq(zoom, 2, '[4] getServerZoom return value is correct');
+        t.eq(zoom, 0, '[4] getServerZoom return value is correct');
 
         var exc;
         layer.serverResolutions = [0.5];