How many times? was: Compression design

[Boudewijn Rempt]

On Monday 27 November 2006 22:59, Bart Coppens wrote:
> On Monday 27 November 2006 20:41, Boudewijn Rempt wrote:
> > I'm already considering another approach, piggy-backing off the list of
> > swappable tiles, but there's this: on creating an image, the histogram
> > widget indecently often iterates over the paint device:
>
> Yes, I admit to that indecency. But by doing that, I could postpone doing
> the histogram until after the user has finished painting (or a filter has
> done its job), so as to not bother the user while with decreased
> performance while painting. Especially when a filter needs to do stuff to
> the entire paintdevice in more than one pass, it's better to do the
> histogram at the end.

Well, this is on image creation, and the histogram code iterates twenty times 
over the same single area. It must be possible to optimize that somehow.

> Now I could've done more evil tricks like do triggers on swapout, or store
> the stuff alongside a tile, but I think that'd expose the tiles too much.
> Of course, I'm open to suggestions here.

I should investigate some more I think.
-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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