[PATCH weston v2 2/2] evdev: Improve touchpad support and add motion filters

Jonas Ådahl jadahl at gmail.com
Thu May 17 08:20:28 PDT 2012

On Thu, May 17, 2012 at 5:13 PM, Chase Douglas
<chase.douglas at canonical.com> wrote:
> On 05/17/2012 07:53 AM, Daniel Stone wrote:
>> Hi,
>> On 17 May 2012 15:20, Chase Douglas <chase.douglas at canonical.com> wrote:
>>> I know I don't have much (any?) clout in wayland, but I feel strongly
>>> enough about moving this logic to a separate library that I'm going to
>>> NACK this. We need to resolve this problem from the beginning, or else
>>> we will end up in some of the same messes we have in the X server.
>> No, it's a fair shout.  Ultimately we definitely want all of this to
>> be in a separate library.  I worry that introducing a library now when
>> we don't know what either the consumers really want or the producer
>> can give us would be a massive pain though, especially for things like
>> bisect.  I'd be much happier just dropping it in the source tree now,
>> being careful to keep it as independent as possible, and then
>> gradually evolve it to be a separate library that things like X can
>> use.
> I would be very sad if we couldn't figure out a pointer acceleration
> library interface at this point.
> If you're worried about API/ABI issues, most of the wayland protocol is
> still in flux, as far as I understand. Even still, I don't think it will
> be too hard to get this right the first time.
>> This also gets really hairy when touch comes into the mix, so for
>> instance we'd need to deal with the interactions between touch events
>> and tap-to-click etc ...
> tap-to-click is a separate issue. It's a trackpad "gesture" feature.
> That should be handled by a separate, client-side library, imo. Right
> now I'm only advocating for a simple library to handle pointer acceleration.

Maybe a simple middle way would be to put it into weston while
enabling it to be compiled as a separate library. It's already fairly
decoupled. It'll have a highly experimental weston specific API that
will brake a lot but it will be possible to experiment with.


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