Patch for KCurve and KisPerChannelFilter

[Cyrille Berger]

> > We don't have something like a pyramid representation of layers (yet)
>
> Emm.. Can i read about that pyramid anywhere?

Some notes taken a while back:
http://wiki.koffice.org/index.php?title=Krita/Akademy_2007_Meeting#tile_backend

> > where we could filter at the zoom level nearest to the actual zoom level.
> > That would be
> > one solution, sort of.
>
> Why do we need many thumbs? And why filtering the nearest one? Why not have
> only two layer representations: original and current zoom level? Zoomed
> copy could (?) be used by projection (keeping in mind interpolation).
Because scaling is also an expensive process. The pyramid would be updated 
continuously, in a background thread.

-- 
Cyrille Berger
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