Hi all.  I just happened to stumble upon this post...it appears as 
if the GDK drawing code will be marked "deprecated" with the upcoming 
GTK+ 2.22 release.  Gerbv will still compile with 2.22, although this 
probably means the GDK code will be stripped out with a future upcoming 
release (maybe the 3.0 one?), at which point gerbv will not compile.

http://blogs.gnome.org/otte/2010/07/27/rendering-cleanup/

     We still have some time, but we should do another poll on the speed 
of the cairo rendering on users computers and see if we can at least use 
Cairo as the default renderer with the next gerbv release, and start 
working on eventually getting rid of the GDK code (it routinely gets bug 
reports for some of its inaccuracies too...)
     Also, I happened to find a couple posts about speeding up cairo 
rendering by doing some extra math to round all shapes to pixel 
boundaries.  If I have time in the next months, I may try out some 
algorithms and see it they actually make a speed difference with the 
cairo code.
     Cheers--

-- 
Julian Lamb

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