On Oct 31, 2010, at 10:24 AM, Robby Findler wrote:
Overall, tho, we'd like to be able to support this kind of thing, but
we need to do a better job. As I'm writing this, I wonder if we could
exploit the sharing in the image. In your example, there are only 11
calls to 'square' that turn into those 42,000 different squares spread
around. If we could detect and exploit the sharing somehow that could
lead to a big speed up. (But this is just a half-formed thought;
nothing may come of it.)
The "cache-bitmap" tweak I suggested might provide this.
(local [(define sub (cache-bitmap (carpet (/ size 3) c))) ...]
(overlay (square size "outline" c)
(above (beside sub sub sub)
(beside sub ctr sub)
(beside sub sub sub))))
After "sub" is rendered for the first time, its bitmap will be
cached, then used seven more times.
Stephen Bloch
sbl...@adelphi.edu
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