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

[Markus Armbruster <armbru@xxxxxxxxxx>]

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.

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