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

Chase Douglas chase.douglas at canonical.com
Thu May 17 09:13:34 PDT 2012

On 05/17/2012 08:20 AM, Jonas Ådahl wrote:
> 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.

I think this would be a great first step. +1.

-- Chase

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