1 files changed, 22 insertions, 20 deletions
diff --git a/js/RequestAnimationFrame.js b/js/RequestAnimationFrame.js
index 77f85c5..b1940ae 100644
--- a/js/RequestAnimationFrame.js
+++ b/js/RequestAnimationFrame.js
@@ -1,22 +1,24 @@
-/**
- * Provides requestAnimationFrame in a cross browser way.
- * http://paulirish.com/2011/requestanimationframe-for-smart-animating/
- */
+(function() {
+    var lastTime = 0;
+    var vendors = ['webkit', 'moz'];
+    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
+        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
+        window.cancelAnimationFrame =
+          window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame'];
+    }
 
-if ( !window.requestAnimationFrame ) {
+    if (!window.requestAnimationFrame)
+        window.requestAnimationFrame = function(callback, element) {
+            var currTime = new Date().getTime();
+            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
+            var id = window.setTimeout(function() { callback(currTime + timeToCall); },
+              timeToCall);
+            lastTime = currTime + timeToCall;
+            return id;
+        };
 
-	window.requestAnimationFrame = ( function() {
-
-		return window.webkitRequestAnimationFrame ||
-		window.mozRequestAnimationFrame ||
-		window.oRequestAnimationFrame ||
-		window.msRequestAnimationFrame ||
-		function( /* function FrameRequestCallback */ callback, /* DOMElement Element */ element ) {
-
-			window.setTimeout( callback, 1000 / 60 );
-
-		};
-
-	} )();
-
-}
+    if (!window.cancelAnimationFrame)
+        window.cancelAnimationFrame = function(id) {
+            clearTimeout(id);
+        };
+}());