From d62e91023931f8dd0796ce6aedce77496d22c653 Mon Sep 17 00:00:00 2001
From: tsauerwein <tobias.sauerwein@camptocamp.com>
Date: Fri, 19 Dec 2014 14:46:54 +0100
Subject: [PATCH] Implement hasFeatureAtPixel for canvas

---
 src/ol/renderer/layerrenderer.js |  8 ++++++++
 src/ol/renderer/maprenderer.js   | 20 ++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/src/ol/renderer/layerrenderer.js b/src/ol/renderer/layerrenderer.js
index 14a64db3cb..bb74eb2a3b 100644
--- a/src/ol/renderer/layerrenderer.js
+++ b/src/ol/renderer/layerrenderer.js
@@ -54,6 +54,14 @@ goog.inherits(ol.renderer.Layer, goog.Disposable);
 ol.renderer.Layer.prototype.forEachFeatureAtPixel = goog.nullFunction;
 
 
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {olx.FrameState} frameState Frame state.
+ * @return {boolean} Is there a feature at the given pixel?
+ */
+ol.renderer.Layer.prototype.hasFeatureAtPixel = goog.functions.FALSE;
+
+
 /**
  * @protected
  * @return {ol.layer.Layer} Layer.
diff --git a/src/ol/renderer/maprenderer.js b/src/ol/renderer/maprenderer.js
index 7dd9bc0025..bc681472f5 100644
--- a/src/ol/renderer/maprenderer.js
+++ b/src/ol/renderer/maprenderer.js
@@ -169,6 +169,26 @@ ol.renderer.Map.prototype.forEachFeatureAtPixel =
 };
 
 
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {olx.FrameState} frameState FrameState.
+ * @param {function(this: U, ol.layer.Layer): boolean} layerFilter Layer filter
+ *     function, only layers which are visible and for which this function
+ *     returns `true` will be tested for features.  By default, all visible
+ *     layers will be tested.
+ * @param {U} thisArg Value to use as `this` when executing `layerFilter`.
+ * @return {boolean} Is there a feature at the given pixel?
+ * @template U
+ */
+ol.renderer.Map.prototype.hasFeatureAtPixel =
+    function(coordinate, frameState, layerFilter, thisArg) {
+  var hasFeature = this.forEachFeatureAtPixel(
+      coordinate, frameState, goog.functions.TRUE, this, layerFilter, thisArg);
+
+  return goog.isDef(hasFeature) ? hasFeature : false;
+};
+
+
 /**
  * @param {ol.layer.Layer} layer Layer.
  * @protected