Add ol.color.equals

src/ol/color/color.js

@@ -48,6 +48,18 @@ ol.color.rgbaColorRe_ =
     /^(?:rgba)?\((0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|1|0\.\d{0,10})\)$/i;
 
 
+/**
+ * @param {ol.Color} color1 Color1.
+ * @param {ol.Color} color2 Color2.
+ * @return {boolean} Equals.
+ */
+ol.color.equals = function(color1, color2) {
+  return color1 === color2 || (
+      color1[0] == color2[0] && color1[1] == color2[1] &&
+      color1[2] == color2[2] && color1[3] == color2[3]);
+};
+
+
 /**
  * @param {string} s String.
  * @param {ol.Color=} opt_color Color.