Scaling pixmap data

I have writtin a GTK app that is used to display graphical data elements.  I
am interested in having an additional window that contains a zoomed view of
the original data.  I would like the zoomed view to be updated as I move the
cursor through the original window.  

I have been able to get it all working except for the scaling of the
original window data to the zoom window.  Is there a GTK function that can
be used to scale pixmap data within a window?

Dave Poulsen
Evans & Sutherland
Save the whales - collect the whole set!

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