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window.requestAnimationFrame polyfill (with high resolution timing, very precise)
'use strict';
// requestAnimationFrame polyfill by Erik Möller.
// Fixes from Paul Irish, Tino Zijdel, Andrew Mao, Klemen Slavic, Darius Bacon and Joan Alba Maldonado.
// Adapted from https://gist.github.com/paulirish/1579671 which derived from
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
// Added high resolution timing. This window.performance.now() polyfill can be used: https://gist.github.com/jalbam/cc805ac3cfe14004ecdf323159ecf40e
// MIT license
// Gist: https://gist.github.com/jalbam/5fe05443270fa6d8136238ec72accbc0
(function() {
var vendors = ['webkit', 'moz', 'ms', 'o'], vp = null;
for (var x = 0; x < vendors.length && !window.requestAnimationFrame && !window.cancelAnimationFrame; x++)
{
vp = vendors[x];
window.requestAnimationFrame = window.requestAnimationFrame || window[vp + 'RequestAnimationFrame'];
window.cancelAnimationFrame = window.cancelAnimationFrame || window[vp + 'CancelAnimationFrame'] || window[vp + 'CancelRequestAnimationFrame'];
}
if (/iP(ad|hone|od).*OS 6/.test(window.navigator.userAgent) || !window.requestAnimationFrame || !window.cancelAnimationFrame) //iOS6 is buggy.
{
var lastTime = 0;
window.requestAnimationFrame = function(callback, element)
{
var now = window.performance.now();
var nextTime = Math.max(lastTime + 16, now); //First time will execute it immediately but barely noticeable and performance is gained.
return setTimeout(function() { callback(lastTime = nextTime); }, nextTime - now);
};
window.cancelAnimationFrame = clearTimeout;
}
}());
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