diff --git a/src/ol/render/canvas/canvasreplay.js b/src/ol/render/canvas/canvasreplay.js
index 8c3f672bb5..803b556708 100644
--- a/src/ol/render/canvas/canvasreplay.js
+++ b/src/ol/render/canvas/canvasreplay.js
@@ -91,8 +91,8 @@ ol.render.canvas.Batch.prototype.appendFlatCoordinates =
  * @param {goog.vec.Mat4.AnyType} transform Transform.
  */
 ol.render.canvas.Batch.prototype.draw = function(context, transform) {
-  var pixelCoordinates = ol.render.transformCoordinates(
-      this.coordinates, transform, this.pixelCoordinates_);
+  var pixelCoordinates = ol.render.transformFlatCoordinates(
+      this.coordinates, 2, transform, this.pixelCoordinates_);
   this.pixelCoordinates_ = pixelCoordinates;  // FIXME ?
   var instructions = this.instructions;
   var i = 0;
diff --git a/src/ol/render/render.js b/src/ol/render/render.js
index 64829288ac..5d0aed06a5 100644
--- a/src/ol/render/render.js
+++ b/src/ol/render/render.js
@@ -4,35 +4,31 @@ goog.require('goog.vec.Mat4');
 
 
 /**
- * @param {Array.<number>} coordinates Coordinates.
+ * @param {Array.<number>} flatCoordinates Flat coordinates.
+ * @param {number} stride Stride.
  * @param {goog.vec.Mat4.AnyType} transform Transform.
  * @param {Array.<number>=} opt_dest Destination.
  * @return {Array.<number>} Transformed coordinates.
  */
-ol.render.transformCoordinates = function(coordinates, transform, opt_dest) {
+ol.render.transformFlatCoordinates =
+    function(flatCoordinates, stride, transform, opt_dest) {
   var m00 = goog.vec.Mat4.getElement(transform, 0, 0);
   var m10 = goog.vec.Mat4.getElement(transform, 1, 0);
   var m01 = goog.vec.Mat4.getElement(transform, 0, 1);
   var m11 = goog.vec.Mat4.getElement(transform, 1, 1);
   var m03 = goog.vec.Mat4.getElement(transform, 0, 3);
   var m13 = goog.vec.Mat4.getElement(transform, 1, 3);
-  var n = coordinates.length;
-  var result;
-  if (goog.isDef(opt_dest)) {
-    result = opt_dest;
-  } else {
-    result = [];
+  var dest = goog.isDef(opt_dest) ? opt_dest : [];
+  var i = 0;
+  var j, jj;
+  for (j = 0, jj = flatCoordinates.length; j < jj; j += stride) {
+    var x = flatCoordinates[j];
+    var y = flatCoordinates[j + 1];
+    dest[i++] = m00 * x + m01 * y + m03;
+    dest[i++] = m10 * x + m11 * y + m13;
   }
-  var j = 0;
-  var i, x, y;
-  for (i = 0; i < n; ) {
-    x = coordinates[i++];
-    y = coordinates[i++];
-    result[j++] = m00 * x + m01 * y + m03;
-    result[j++] = m10 * x + m11 * y + m13;
+  if (goog.isDef(opt_dest) && dest.length != i) {
+    dest.length = i;
   }
-  if (goog.isDef(opt_dest) && result.length != j) {
-    result.length = j;
-  }
-  return result;
+  return dest;
 };