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                        <h1 class="file-heading">File: src/pixi/utils/Utils.js</h1>

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    <pre class="code prettyprint linenums">
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel

// MIT license

/**
 * A polyfill for requestAnimationFrame
 *
 * @method requestAnimationFrame
 */
/**
 * A polyfill for cancelAnimationFrame
 *
 * @method cancelAnimationFrame
 */
var lastTime = 0;
var vendors = [&#x27;ms&#x27;, &#x27;moz&#x27;, &#x27;webkit&#x27;, &#x27;o&#x27;];
for(var x = 0; x &lt; vendors.length &amp;&amp; !window.requestAnimationFrame; ++x) {
    window.requestAnimationFrame = window[vendors[x]+&#x27;RequestAnimationFrame&#x27;];
    window.cancelAnimationFrame = window[vendors[x]+&#x27;CancelAnimationFrame&#x27;]
                               || window[vendors[x]+&#x27;CancelRequestAnimationFrame&#x27;];
}

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;
    };

if (!window.cancelAnimationFrame)
    window.cancelAnimationFrame = function(id) {
        clearTimeout(id);
    };

window.requestAnimFrame = window.requestAnimationFrame;

/**
 * Converts a hex color number to an [R, G, B] array
 *
 * @method HEXtoRGB
 * @param hex {Number}
 */
function HEXtoRGB(hex) {
	return [(hex &gt;&gt; 16 &amp; 0xFF) / 255, ( hex &gt;&gt; 8 &amp; 0xFF) / 255, (hex &amp; 0xFF)/ 255];
}

/**
 * A polyfill for Function.prototype.bind
 *
 * @method bind
 */
if (typeof Function.prototype.bind != &#x27;function&#x27;) {
  Function.prototype.bind = (function () {
    var slice = Array.prototype.slice;
    return function (thisArg) {
      var target = this, boundArgs = slice.call(arguments, 1);

      if (typeof target != &#x27;function&#x27;) throw new TypeError();

      function bound() {
	var args = boundArgs.concat(slice.call(arguments));
	target.apply(this instanceof bound ? this : thisArg, args);
      }

      bound.prototype = (function F(proto) {
          proto &amp;&amp; (F.prototype = proto);
          if (!(this instanceof F)) return new F;
	})(target.prototype);

      return bound;
    };
  })();
}

/**
 * A wrapper for ajax requests to be handled cross browser
 *
 * @class AjaxRequest
 * @constructor
 */
var AjaxRequest = PIXI.AjaxRequest = function()
{
	var activexmodes = [&quot;Msxml2.XMLHTTP.6.0&quot;, &quot;Msxml2.XMLHTTP.3.0&quot;, &quot;Microsoft.XMLHTTP&quot;] //activeX versions to check for in IE

	if (window.ActiveXObject)
	{ //Test for support for ActiveXObject in IE first (as XMLHttpRequest in IE7 is broken)
		for (var i=0; i&lt;activexmodes.length; i++)
		{
			try{
				return new ActiveXObject(activexmodes[i])
			}
   			catch(e){
    			//suppress error
   			}
		}
	}
	else if (window.XMLHttpRequest) // if Mozilla, Safari etc
  	{
  		return new XMLHttpRequest()
 	}
 	else
 	{
		return false;
 	}
}

/*
 * DEBUGGING ONLY
 */
PIXI.runList = function(item)
{
	console.log(&quot;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&quot;)
	console.log(&quot;_&quot;)
	var safe = 0;
	var tmp = item.first;
	console.log(tmp);

	while(tmp._iNext)
	{
		safe++;
		tmp = tmp._iNext;
		console.log(tmp);
	//	console.log(tmp);

		if(safe &gt; 100)
		{
			console.log(&quot;BREAK&quot;)
			break
		}
	}
}






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