Menus: unnecessary repaints?!

[Oswald Buddenhagen]

On Fri, Jun 06, 2003 at 09:44:21AM +0200, Karl Vogel wrote:
> On 06 Jun 2003, you wrote in kde.kde-optimize:
> > On Thu, Jun 05, 2003 at 05:32:04PM +0200, Waldo Bastian wrote:
> >> Not sure if you will run into problems with invalid areas that need
> >> repainting before scrolling though.
> >> 
> > sure you would, but invalidating the image if the to-be-scrolled
> > part is (partially) obscured should not be that hard in theory. of
> > course things get somewhat more complicated if you want to do
> > partial scrolls to reuse every single already visible character ...
> 
> I've never done any X coding, but doesn't X take care of the
> layering?! ie.  can't you just scroll the entire window contents
> without having to take overlapping windows in mind?!
>
only with "save unders" or "backing store" or "double buffering" or
something like that enabled. by default things are painted directly to
the screen, afaik. lubos will know. :)

greetings

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