You will have to use UpdateLayeredWindow ( http://msdn2.microsoft.com/en-us/library/ms633556.aspx ), after you created a Device Context in memory and rendered the alpha image into a bitmap.
You can even create alpha gradients or shadows with this method.
And it requires at least Windows 2000 and does not work with the Graphics window or a canvas. ;)
You can even create alpha gradients or shadows with this method.
And it requires at least Windows 2000 and does not work with the Graphics window or a canvas. ;)