var CanvasPool = require('../display/canvas/CanvasPool'); 
var CanvasFeatures = { 
supportInverseAlpha: false ,
supportNewBlendModes: false }
; 
function checkBlendMode(){ 
var pngHead = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAABAQMAAADD8p2OAAAAA1BMVEX/'; 
var pngEnd = 'AAAACklEQVQI12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg=='; 
var magenta = new Image(); 
magenta.onload = function (){ 
var yellow = new Image(); 
yellow.onload = function (){ 
var canvas = CanvasPool.create(yellow, 6, 1); 
var context = canvas.getContext('2d'); 
context.globalCompositeOperation = 'multiply'; 
context.drawImage(magenta, 0, 0); 
context.drawImage(yellow, 2, 0); 
if (!context.getImageData(2, 0, 1, 1)) { 
return false ; 
} 
var data = context.getImageData(2, 0, 1, 1).data; 
CanvasPool.remove(yellow); 
CanvasFeatures.supportNewBlendModes = (data[0] === 255 && data[1] === 0 && data[2] === 0); 
} 
; 
_AN_Write_src('src', yellow, false , pngHead + '/wCKxvRF' + pngEnd); 
} 
; 
_AN_Write_src('src', magenta, false , pngHead + 'AP804Oa6' + pngEnd); 
return false ; 
} 
function checkInverseAlpha(){ 
var canvas = CanvasPool.create(this, 2, 1); 
var context = canvas.getContext('2d'); 
context.fillStyle = 'rgba(10, 20, 30, 0.5)'; 
context.fillRect(0, 0, 1, 1); 
var s1 = context.getImageData(0, 0, 1, 1); 
if (s1 === null ) { 
return false ; 
} 
context.putImageData(s1, 1, 0); 
var s2 = context.getImageData(1, 0, 1, 1); 
return (s2.data[0] === s1.data[0] && s2.data[1] === s1.data[1] && s2.data[2] === s1.data[2] && s2.data[3] === s1.data[3]); 
} 
function init(){ 
if (document !== undefined) { 
CanvasFeatures.supportNewBlendModes = checkBlendMode(); 
CanvasFeatures.supportInverseAlpha = checkInverseAlpha(); 
} 
return CanvasFeatures; 
} 
module.exports = init();