Re: [Qemu-devel] Re: [Spice-devel] paravirtual mouse/tablet

[Gerd Hoffmann]

On 01/13/11 16:55, Anthony Liguori wrote:
> On 01/13/2011 05:51 AM, Gerd Hoffmann wrote:
> > On 01/13/11 12:01, Stefan Hajnoczi wrote:
> >
> > > Can you elaborate how the spice display channel comes into play? On a
> > > physical machine you just have input devices with no notion of
> > > display. It's up to the windowing system to process input events and
> > > handle multihead. Why does a pv tablet tie itself to a display
> > > channel?
> >
> > You have two qxl devices, each linked to a spice display channel. The
> > spice client will open one window for each channel. The mouse position
> > is a triple consisting of (x, y, window/channel).
>
> Would be slightly cleaner to have multiple devices.

Yea, right, that would work too.  If we have some way to assign a 
display to a pvmouse device this works equally well.

> That maybe implies that we need an offscreen coordinate for the
> mouse so that you can hide the mouse when it leaves one window.

Hmm?  I fail to see why multihead is special here.

cheers,
  Gerd