[Interest] Qt and x11/MPX

[laszlo.p.agocs at nokia.com]

Upgrading to a newer Ubuntu version (and using the Qt shipped with it) might help in Robert's case though because as far as I understand Ubuntu ships Qt 4.7.x with the experimental XI2.1 touch patches applied.

In Qt 5 there are two platforms that have touch support currently: wayland, and xcb on Harmattan (the latter is again some unofficial XI2.1 stuff). Others can use the evdevtouch generic plug-in, but that opens and reads from the input device directly via evdev so it is more suitable for embedded platforms (e.g. eglfs, or X-less setups like kms)

Official XInput multi-touch support is coming in XI2.2 (X.org 1.12). Supporting this in xcb would certainly be nice (I'm planning to take a look at it at some point) but it is indeed not high priority now. 

Regards,
Laszlo

________________________________________
From: interest-bounces+laszlo.p.agocs=nokia.com at qt-project.org [interest-bounces+laszlo.p.agocs=nokia.com at qt-project.org] on behalf of ext Thiago Macieira [thiago at kde.org]
Sent: Saturday, February 11, 2012 12:56 PM
To: interest at qt-project.org
Subject: Re: [Interest] Qt and x11/MPX

On sábado, 11 de fevereiro de 2012 11.35.53, Robert Voinea wrote:
> 1. What is the current state of multitouch in Qt/X11?

Different patches, no official implementation because future X11 plans were
abandoned. The XInput 2.0 support that MeeGo and Mer have is a non-standard
patch that was once submitted to the X.org guys as a proposal for having MT
work. After a bit of time, it became clear that the protocol was inadequate so
they started working on 2.1.

It took too long. By the time they had integrated XInput 2.1 into the
protocol, all interest on furthering X11 had gone away. Therefore, Qt has no
plans of ever supporting XInput 2, any version thereof

By that, read: none of the current Qt developers and companies backing them.
If someone else comes along and wants to do that, it's another story.

> 2. Has anyone tested something similar?... Qt + Multitouch? on Linux?

It works with either the patches or with other systems than X. I'm told the
Wayland support is good.

> 3. Is there a solution to my problem?...

Patching either Qt, or X, or both.

--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center
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