On Tue, Mar 11, 2003 at 01:07:21PM +0100, Raphaël Quinet wrote:
> On Tue, 11 Mar 2003 09:46:49 +0000, "Adam D. Moss" <[EMAIL PROTECTED]> wrote:
> > [...]  The idea
> > of rehash-on-dirty would be to catch identical tiles, even
> > accidentally-identical tiles (like great masses of transparent
> > tiles, presuming that you scrub the RGB data of a transparent
> > pixel; the row-hints stuff has been doing this and potentially
> > breaking the ill-advised anti-erase feature for 100 years now
> > and no-one has complained), that the normal COW routes miss.
> Hmmm...  This is interesting.  I didn't know that a side effect of the
> row-hints would be to discard the RGB data from fully transparent
> pixels.  Of course, this makes sense and this is the right thing to do.
> But this also means that some plug-ins such as Noisify should
> definitely never use the invisible RGB data in any operation, because
> the results could be (very) different if some tiles are swapped out.
> See the discussion in: http://bugzilla.gnome.org/show_bug.cgi?id=72853

Hm.  Though I see the posibility to temporarily make some
area transparent just to give some its parts nonzero opacity
later as a useful feature, the rest of world obviously thinks
otherwise ;-(

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