Hit detection refactoring

Get the frame state from the map instead of storing values in the layer renderers.

src/ol/renderer/canvas/canvasvectorlayerrenderer.js

@@ -32,12 +32,6 @@ ol.renderer.canvas.VectorLayer = function(mapRenderer, vectorLayer) {
    */
   this.dirty_ = false;
 
-  /**
-   * @private
-   * @type {ol.Extent}
-   */
-  this.frameStateExtent_ = ol.extent.createEmpty();
-
   /**
    * @private
    * @type {number}
@@ -50,12 +44,6 @@ ol.renderer.canvas.VectorLayer = function(mapRenderer, vectorLayer) {
    */
   this.renderedResolution_ = NaN;
 
-  /**
-   * @private
-   * @type {number}
-   */
-  this.renderedRotation_ = NaN;
-
   /**
    * @private
    * @type {ol.Extent}
@@ -101,20 +89,18 @@ ol.renderer.canvas.VectorLayer.prototype.composeFrame =
  * @inheritDoc
  */
 ol.renderer.canvas.VectorLayer.prototype.forEachFeatureAtPixel =
-    function(pixel, callback, opt_obj) {
+    function(coordinate, frameState, callback, opt_obj) {
   if (goog.isNull(this.replayGroup_)) {
     return undefined;
   } else {
-    goog.asserts.assert(!ol.extent.isEmpty(this.frameStateExtent_));
-    goog.asserts.assert(!isNaN(this.renderedResolution_));
-    goog.asserts.assert(!isNaN(this.renderedRotation_));
-    var coordinate = this.getMap().getCoordinateFromPixel(pixel);
+    var extent = frameState.extent;
+    var resolution = frameState.view2DState.resolution;
+    var rotation = frameState.view2DState.rotation;
     var layer = this.getLayer();
     var renderGeometryFunction = this.getRenderGeometryFunction_();
     goog.asserts.assert(goog.isFunction(renderGeometryFunction));
-    return this.replayGroup_.forEachGeometryAtCoordinate(this.frameStateExtent_,
-        this.renderedResolution_, this.renderedRotation_, coordinate,
-        renderGeometryFunction,
+    return this.replayGroup_.forEachGeometryAtPixel(extent, resolution,
+        rotation, coordinate, renderGeometryFunction,
         /**
          * @param {ol.geom.Geometry} geometry Geometry.
          * @param {Object} data Data.
@@ -183,8 +169,6 @@ ol.renderer.canvas.VectorLayer.prototype.prepareFrame =
   var frameStateResolution = frameState.view2DState.resolution;
   var pixelRatio = frameState.devicePixelRatio;
 
-  this.frameStateExtent_ = frameStateExtent;
-
   if (!this.dirty_ &&
       this.renderedResolution_ == frameStateResolution &&
       this.renderedRevision_ == vectorSource.getRevision() &&
@@ -225,7 +209,6 @@ ol.renderer.canvas.VectorLayer.prototype.prepareFrame =
 
   this.renderedResolution_ = frameStateResolution;
   this.renderedRevision_ = vectorSource.getRevision();
-  this.renderedRotation_ = frameState.view2DState.rotation;
   if (!replayGroup.isEmpty()) {
     this.replayGroup_ = replayGroup;
   }