Webmaster Forum / Flash / General Flash Topics / September 2008

I am loading a PNG with transparency into a UILoader.  This part works
correctly, transparency and all.

Now I need to find out the rectangle that is transparent.  I found the
getColorBoundsRect() function, and copied the UILoader.content into a
bitmapData, but when I run the getColorBoundsRect it comes back with a
Rectangle that has no width or height - IE, it finds no transparent pixels.

To test, I tried using getPixel32 on an area of the image I know is
transparent, and it comes back to tell me that the pixel alpha is 255?

Applicable code is attached.

function rightImageLoaded(evt:Event):void {
    var clBD:BitmapData = new BitmapData(735,600,true);
    clBD.draw((evt.target as UILoader).content);
    var transparentRect:Rectangle =
clBD.getColorBoundsRect(0xFF000000,0x00000000,true);
   
    trace(transparentRect);
}