/*
 * typedefs.js
 * Normalizes browser-specific prefixes
 */

if (typeof window !== 'undefined') {
    window.requestAnimFrame = (function () {
        return window.requestAnimationFrame ||
            window.webkitRequestAnimationFrame ||
            window.mozRequestAnimationFrame ||
            window.oRequestAnimationFrame ||
            window.msRequestAnimationFrame ||
            function (/* function FrameRequestCallback */ callback) {
                window.setTimeout(callback, 1000 / 60);
            };
    })();

    navigator.getUserMedia = navigator.getUserMedia ||
        navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
    window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL;
}
Math.imul = Math.imul || function(a, b) {
    var ah = (a >>> 16) & 0xffff,
        al = a & 0xffff,
        bh = (b >>> 16) & 0xffff,
        bl = b & 0xffff;
    // the shift by 0 fixes the sign on the high part
    // the final |0 converts the unsigned value into a signed value
    return ((al * bl) + (((ah * bl + al * bh) << 16) >>> 0) | 0);
};