[PATCH wayland-protocols v2] unstable: Add input-timestamps protocol

[Pekka Paalanen]

On Wed, 20 Dec 2017 16:21:32 +0200
Alexandros Frantzis <alexandros.frantzis at collabora.com> wrote:

> On Tue, Dec 19, 2017 at 01:06:11PM +0200, Alexandros Frantzis wrote:
> > On Tue, Dec 19, 2017 at 10:15:06AM +0200, Pekka Paalanen wrote:  
> > > On Mon, 18 Dec 2017 14:55:00 +0200
> > > Alexandros Frantzis <alexandros.frantzis at collabora.com> wrote:
> > >   
> > > > wl_pointer, wl_keyboard and wl_touch events currently use a 32-bit
> > > > timestamp with millisecond resolution. In some cases, notably latency
> > > > measurements, this resolution is too coarse to be useful.
> > > > 
> > > > This protocol provides additional high-resolution timestamps events,
> > > > which are emitted before the corresponding input event. Each timestamp
> > > > event contains a high-resolution, and ideally higher-accuracy, version
> > > > of the 'time' argument of the first subsequent supported input event.
> > > > 
> > > > Clients that care about high-resolution timestamps just need to keep
> > > > track of the last timestamp event they receive and associate it with the
> > > > next supported input event that arrives.
> > > > 
> > > > Signed-off-by: Alexandros Frantzis <alexandros.frantzis at collabora.com>
> > > > Reviewed-by: Pekka Paalanen <pekka.paalanen at collabora.co.uk>
> > > > Acked-by: Jonas Ådahl <jadahl at gmail.com>
> > > > ---
> > > > 
> > > > Changes in v2:
> > > >  - Add '...carrying a timestamp...' to better describe the set of subsequent
> > > >    input events in the timestamp event description. 
> > > >  - Clarify normalization requirements of tv_sec_hi, tv_sec_lo, tv_nsec
> > > >    timestamp representation.
> > > > 
> > > >  Makefile.am                                        |   1 +
> > > >  unstable/input-timestamps/README                   |   4 +
> > > >  .../input-timestamps-unstable-v1.xml               | 145 +++++++++++++++++++++
> > > >  3 files changed, 150 insertions(+)
> > > >  create mode 100644 unstable/input-timestamps/README
> > > >  create mode 100644 unstable/input-timestamps/input-timestamps-unstable-v1.xml  
> > > 
> > > Cool! I suppose we want to see the Weston implementation patches posted
> > > to the list before landing this?  
> > 
> > The plan is to refresh and clean up the proof-of-concept Weston
> > implementation and propose it. For those interested to take an
> > early look the p-o-c code is at:
> > 
> > https://gitlab.collabora.com/alf/weston/commits/zwp-input-timestamps  
> 
> Hi all,
> 
> a heads-up that I have posted the libweston input-timestamps patchset
> for review at:
> 
> https://lists.freedesktop.org/archives/wayland-devel/2017-December/036392.html

Hi,

I have been going through the Weston implementation enough that I can
confidently land the wayland-protocols patch tomorrow, Friday.

If anyone has doubts, please shout.


Thanks,
pq
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