Re: [Xen-devel] RFC: drop frontend support for relative pointer

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Tue, 13 Oct 2009, Markus Armbruster wrote:
> Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> writes:
> 
> > On Tue, 13 Oct 2009, Markus Armbruster wrote:
> >> > I don't really thing we could use absolute because we do graphic
> >> > device pass through with PV guest and the resolution we have on the
> >> > screen is completely decouple with the fb resolution.
> >> 
> >> I figure the real solution is to decouple the PV pointer/keyboard from
> >> the PV framebuffer, so you can configure the pointer independently, and
> >> don't have to drag a PV framebuffer along, just to get a PV
> >> pointer/keyboard.
> >> 
> >
> > True, but it still wouldn't solve the problem of dropping relative mouse
> > coordinates support from vkbd.
> 
> You can always convert between relative and absolute in the backend.
> Pointer resolution need not match the graphics resolution (think tablet,
> not touchscreen).
> 
> Nevertheless, it might be more convenient for this use case to keep
> relative around.  Then the backend need only be able to convert from
> absolute to relative (for frontends declining feature-abs-pointer), not
> the other direction.  XCI is of course free to require a frontend that
> doesn't decline.
> 
> If we decide to keep relative, we need to restructure pointer frontend
> initialization to each axis either relative or absolute.  Unless evdev
> developers find a way to continue coping with both.
> 

Given that absolute->relative conversion is not very good, I think it is
best to keep relative alive.


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