Integration of libpointing with Xorg

[Tim Stowell]

Thanks for the information Peter, this is really helpful.

I can understand how it would be simpler to just use the magic numbers in
libinput's code. I was only wanting to use libpointing because it's the
only implementation of the Windows transfer function that I could find, but
if it's not too hard to replicate do you forsee any chance of incorporating
these other transfer functions in libinput at some point?

I'm not familiar enough with libinput to know, but maybe it already
provides transfer functions similar to Windows? Thanks.

-Tim

On Mon, Aug 28, 2017 at 8:14 PM, Peter Hutterer <peter.hutterer at who-t.net>
wrote:

> On Mon, Aug 28, 2017 at 10:21:55AM +0300, Pekka Paalanen wrote:
> > On Sat, 26 Aug 2017 18:02:52 -0600
> > Tim Stowell <stowellt at gmail.com> wrote:
> >
> > > Hello all,
> > >
> > > I had several questions:
> > >
> > >    1. Does anyone know if there has been an effort to integrate
> > >    https://github.com/INRIA/libpointing with Xorg?
> > >    2. If not, how would I go about attempting this integration?
> Libpointing
> > >    basically outputs x and y displacements based on selected transfer
> > >    functions. I would need to find out where Xorg currently handles
> mouse
> > >    input and sets the cursor position so I could somehow intercept it
> and
> > >    modify those coordinates.
> > >
> > > I would appreciate any pointers in the right directions, such as which
> > > file(s) in the Xorg codebase handlle mouse movement events and actually
> > > move the cursor? Thanks.
> >
> > Hi,
> >
> > what is the advantage of libpointing you are seeking over, say, libinput?
> > https://www.freedesktop.org/wiki/Software/libinput/
> >
> > I had a quick glance over the libpointing README and wiki and but did
> > not quite understand the project's benefits.
>
> it's a research project to analyze and experiment with pointer acceleration
> (pointer transfer) functions. From my POV it may be interesting to use it
> to
> gather data about acceleration function but I don't think using libpointing
> directly for something as (technically) simple as a pointer acceleration
> function gives us a lot of benefits. Much easier to take the magic numbers
> and copy them across into libinput's implementation.
>
> Cheers,
>    Peter
>
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