Hi Dmitri,

> First of all, did you determine (by profiling and
>  such) that it is expensive or is this your gut feeling? It is
>  important  to work with correct data, and sometimes our
>  assumptions about performance implications may be
>   incorrect (I get this stuff wrong all the time).

I have not officially profiled it but it is visibly slower than I would like.

> Anyway, assuming that it is super-expensive to
>  repaint  the whole thing, you can construct a clip shape
>  (which would be your bg rectangle minus your small
>   rectangles) and set it on the graphics context.
>  That way the area of the bg rectangle which isn't
> covered by smaller rectangles only will be
>  repainted.
>    Shape clip may be an expensive operation, though
> (depending on the pipeline), so I would still
>    suggest to profile (or just time) both
> approaches.

Yes, but how do I remove areas from a clip region?  I can only see how to set a 
clip region to a Shape and the area around the smaller rectangles is not a 
Shape.

-- 
And loving it,

-Q
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