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function comparePixel(ctx,x,y,r,g,b,a, d)
{
var c = ctx.getImageData(x,y,1,1).data;
if (d === undefined)
d = 0;
r = Math.round(r);
g = Math.round(g);
b = Math.round(b);
a = Math.round(a);
if (Math.abs(c[0]-r)>d || Math.abs(c[1]-g)>d || Math.abs(c[2]-b)>d || Math.abs(c[3]-a)>d) {
console.log('Pixel compare fail:\nactual :[' + c[0]+','+c[1]+','+c[2]+','+c[3] + ']\nexpected:['+r+','+g+','+b+','+a+'] +/- '+d);
return false;
}
return true;
}
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