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<h1 class="file-heading">File: src/pixi/utils/Utils.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
// 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
* You can actually use both requestAnimationFrame and requestAnimFrame,
* you will still benefit from the polyfill
*
* @method requestAnimationFrame
*/
/**
* A polyfill for cancelAnimationFrame
*
* @method cancelAnimationFrame
*/
var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
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) {
window.requestAnimationFrame = function(callback) {
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 hex2rgb
* @param hex {Number}
*/
PIXI.hex2rgb = function(hex) {
return [(hex >> 16 & 0xFF) / 255, ( hex >> 8 & 0xFF) / 255, (hex & 0xFF)/ 255];
};
/**
* Converts a color as an [R, G, B] array to a hex number
*
* @method rgb2hex
* @param rgb {Array}
*/
PIXI.rgb2hex = function(rgb) {
return ((rgb[0]*255 << 16) + (rgb[1]*255 << 8) + rgb[2]*255);
};
/**
* A polyfill for Function.prototype.bind
*
* @method bind
*/
if (typeof Function.prototype.bind !== 'function') {
Function.prototype.bind = (function () {
var slice = Array.prototype.slice;
return function (thisArg) {
var target = this, boundArgs = slice.call(arguments, 1);
if (typeof target !== 'function') 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) {
if (proto) 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
*/
PIXI.AjaxRequest = function()
{
var activexmodes = ['Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.3.0', 'Microsoft.XMLHTTP']; //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<activexmodes.length; i++)
{
try{
return new window.ActiveXObject(activexmodes[i]);
}
catch(e) {
//suppress error
}
}
}
else if (window.XMLHttpRequest) // if Mozilla, Safari etc
{
return new window.XMLHttpRequest();
}
else
{
return false;
}
};
/*
PIXI.packColorRGBA = function(r, g, b, a)//r, g, b, a)
{
// console.log(r, b, c, d)
return (Math.floor((r)*63) << 18) | (Math.floor((g)*63) << 12) | (Math.floor((b)*63) << 6);// | (Math.floor((a)*63))
// i = i | (Math.floor((a)*63));
// return i;
// var r = (i / 262144.0 ) / 64;
// var g = (i / 4096.0)%64 / 64;
// var b = (i / 64.0)%64 / 64;
// var a = (i)%64 / 64;
// console.log(r, g, b, a);
// return i;
};
*/
/*
PIXI.packColorRGB = function(r, g, b)//r, g, b, a)
{
return (Math.floor((r)*255) << 16) | (Math.floor((g)*255) << 8) | (Math.floor((b)*255));
};
PIXI.unpackColorRGB = function(r, g, b)//r, g, b, a)
{
return (Math.floor((r)*255) << 16) | (Math.floor((g)*255) << 8) | (Math.floor((b)*255));
};
*/
/**
* Checks whether the Canvas BlendModes are supported by the current browser
*
* @method canUseNewCanvasBlendModes
* @return {Boolean} whether they are supported
*/
PIXI.canUseNewCanvasBlendModes = function()
{
var canvas = document.createElement('canvas');
canvas.width = 1;
canvas.height = 1;
var context = canvas.getContext('2d');
context.fillStyle = '#000';
context.fillRect(0,0,1,1);
context.globalCompositeOperation = 'multiply';
context.fillStyle = '#fff';
context.fillRect(0,0,1,1);
return context.getImageData(0,0,1,1).data[0] === 0;
};
/**
* Given a number, this function returns the closest number that is a power of two
* this function is taken from Starling Framework as its pretty neat ;)
*
* @method getNextPowerOfTwo
* @param number {Number}
* @return {Number} the closest number that is a power of two
*/
PIXI.getNextPowerOfTwo = function(number)
{
if (number > 0 && (number & (number - 1)) === 0) // see: http://goo.gl/D9kPj
return number;
else
{
var result = 1;
while (result < number) result <<= 1;
return result;
}
};
</pre>
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