[ActionScript 3.0] AS3.0 马赛克效果

var bmpd:BitmapData;
var matrix:Matrix;
var bmp:Bitmap;
var size:Number = 5;
/**
 * @author:Frost.Yen
 * @E-mail:871979853@qq.com
 */

function mosaic(source:MovieClip,size:Number):void
{
    if (bmpd)
    {
        bmpd.dispose();
    }
    if (matrix)
    {
        matrix = null;
    }
    bmpd = new BitmapData(source.width / size,source.height / size,true,0);
    matrix = new Matrix  ;
    matrix.scale(1 / size, 1 / size);
    bmpd.draw(source, matrix);
    bmp = new Bitmap(bmpd);
    source.addChild(bmp);
    bmp.width = source.width;
    bmp.height = source.height;
}
mc.addEventListener(MouseEvent.CLICK,_chang);
function _chang(e:MouseEvent):void
{
    mosaic(mc,size);
    mc.mouseEnabled = false;
}