Getting the region from a paint device

[Boudewijn Rempt]

On Sunday 07 January 2007 11:05, Bart Coppens wrote:

> Well, it's possible, and probably easy, too. But probably not very fast,
> since we use a (homegrown) hashtable, we'd have to iterate over each
> bucket, and then iterate over each chain. Probably not too much of an
> issue, but still.

Okay... I was hoping to use it to speed up composition by working only on the 
intersection of the region with real tiles & the composition region. But if 
it's going to be slow it may not be worth it.

> Also don't forget that we sometimes do tricks with the default tile, so
> that you might get the technically correct QRegion, but doing stuff with it
> might result in a different result than expected (like the inverted
> selection).

Yes, I realize that. It's just that I'm working on the projection, and having 
the possibility of not iterating over areas that are empty anyway would be 
pretty cool.

-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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