[ActionScript 3.0] AS3.0 将图像的Alpha通道转换为黑白图像(分离ARGB方式)

import flash.display.BitmapData;

import flash.display.Bitmap;

/**

 * 将图像的Alpha通道转换为黑白图像(分离ARGB方式)

 */

var bmpd:BitmapData = new ImagePNG();//绑定的png图片

var pixBmpd:BitmapData = new BitmapData(bmpd.width,bmpd.height,false);

for (var i:int=0; i< bmpd.height; i++)

{

    var s:String = "";

    for (var j:int=0; j<bmpd.width; j++)

    {

        var pixel:uint = bmpd.getPixel32(j,i);

        var obj:Object = splitARGB(pixel);

        var temp:String = obj.a == 0 ? "00":obj.a.toString(16);

        s +=  temp + " ";

        pixel = mixRGB(obj.a);

        pixBmpd.setPixel(j,i,pixel);

    }

    //trace(s);//字符画

}

var bmp:Bitmap = new Bitmap(pixBmpd);

this.addChild(bmp);

function splitARGB($argb:uint):Object

{

    return {a:$argb >> 24 & 0xFF,

    r:$argb >> 16 & 0xFF,

    g:$argb >> 8 & 0xFF,

    b:$argb & 0xFF};

}

function mixARGB($color:uint):uint

{

    return $color << 24 | $color << 16 | $color << 8 | $color;

}

function mixRGB($color:uint):uint

{

    return $color << 16 | $color << 8 | $color;

}