[PULL] prep work for screen crossing fixes

[Jamey Sharp]

On Tue, Oct 04, 2011 at 03:35:41PM +1000, Peter Hutterer wrote:
> On Mon, Oct 03, 2011 at 10:02:28PM -0700, Jamey Sharp wrote:
> > On Tue, Oct 04, 2011 at 02:15:53PM +1000, Peter Hutterer wrote:
> > > On Mon, Oct 03, 2011 at 09:02:19PM -0700, Keith Packard wrote:
> > > > On Tue, 4 Oct 2011 13:26:35 +1000, Peter Hutterer <peter.hutterer at who-t.net> wrote:
> > > > >       Store desktop dimensions in screenInfo.
> > > > 
> > > > Do we need the minimum x/y of the desktop too?
> > > 
> > > is it ever other than 0/0?
> > 
> > Sure, that's legal (though crazy). Besides the xorg.conf ServerLayout
> > syntax for positioning a Screen "RightOf", "Below", etc, you can also
> > set the screen's absolute position.
> 
> right, that's for a single screen. but can the desktop origin ever be
> non-zero? Can you have layout where the first screen goes from say -1024..0
> and the second from 0..1204?

I believe that could happen in this kind of config, for example:

Screen "screen1" -1024 0
Screen "screen2" RightOf "screen1"

I think it might also happen if you did:

Screen "screen1"
Screen "screen2" LeftOf "screen1"

I also don't think there's anything forcing screens to be contiguous. In
general I believe the config parser gives you plenty of rope to shoot
yourself in the foot.

Jamey
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