Size of a drawable: how?

["Sergei O. Naoumov" <serge physics unc edu>]

Hi!
How do I get the size of a drawable after it is created? It is clear if the
drawable is a widget. In this case it's just widget->allocation.width and
widget->allocation.height. But... What do I do if my drawable is a pixmap?
Is there any universal way to get the drawable's size?

Thanks,
		Sergei