Find the total bytes used by a bitmap in Flex

Question

If I load a bitmap using a loader in Flex, I can use the loaderInfo.bytesTotal to get the size, total bytes used, of a bitmap.

If I create a bitmap in run time, how can I find out the size, the total bytes used, by that bitmap.

Please advice. Thanks

Answer 1

var bitmapByteSize:int = bitmap.bitmapData.getPixels(bitmap.bitmapData.rect).length;

That might do the trick.

Answer 2

I think a better solution than the one above would be:

var bitmapByteSize:uint = bitmap.bitmapData.width * bitmap.bitmapData.height * 4;

This is because using the getPixels() method creates an additional ByteArray, so it's both slow and uses extra memory.