Fix forEachLayerAtPixel for the canvas renderer

src/ol/renderer/canvas/layer.js

@@ -2,6 +2,7 @@ goog.provide('ol.renderer.canvas.Layer');
 
 goog.require('ol');
 goog.require('ol.extent');
+goog.require('ol.functions');
 goog.require('ol.render.Event');
 goog.require('ol.render.canvas');
 goog.require('ol.render.canvas.Immediate');
@@ -214,12 +215,21 @@ ol.renderer.canvas.Layer.prototype.prepareFrame = function(frameState, layerStat
 
 
 /**
- * @param {ol.Pixel} pixelOnMap Pixel.
- * @param {ol.Transform} imageTransformInv The transformation matrix
- *        to convert from a map pixel to a canvas pixel.
- * @return {ol.Pixel} The pixel.
- * @protected
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {olx.FrameState} frameState Frame state.
+ * @param {function(this: S, ol.layer.Layer, (Uint8ClampedArray|Uint8Array)): T} callback Layer callback.
+ * @param {S} thisArg Value to use as `this` when executing `callback`.
+ * @return {T|undefined} Callback result.
+ * @template S,T
  */
-ol.renderer.canvas.Layer.prototype.getPixelOnCanvas = function(pixelOnMap, imageTransformInv) {
-  return ol.transform.apply(imageTransformInv, pixelOnMap.slice());
+ol.renderer.canvas.Layer.prototype.forEachLayerAtCoordinate = function(coordinate, frameState, callback, thisArg) {
+
+  var hasFeature = this.forEachFeatureAtCoordinate(
+      coordinate, frameState, ol.functions.TRUE, this);
+
+  if (hasFeature) {
+    return callback.call(thisArg, this.getLayer(), null);
+  } else {
+    return undefined;
+  }
 };