get size of a GTKImage

[davidgn servidor unam mx]

I am writing some app where I need to move an image around inside a GtkFixed,
        and I need to get it's size.
        
        I create the image from a file with gtk_image_set_from_file()
        
        Is there an easy way?  I managed to get it's dimensions by getting it's
pixbuf,
        but how can I be sure if it will always have an associated pixbuf?
        
        Reason is I want to center it initially and redimension it's container
so that
        it fits.
        
        Any suggestion?

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