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From: | Gerd Hoffmann |
Subject: | Re: [Qemu-devel] paravirtual mouse/tablet |
Date: | Fri, 14 Jan 2011 17:26:58 +0100 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101208 Red Hat/3.1.7-3.el6_0 Thunderbird/3.1.7 |
Hi,
I guess a mere tuple of (x,y,down) N times should be enough for the protocol, no?Surely, evdev has an interface to support this already. Let's just do what it does instead of inventing something that none of us can validate actually works.
http://www.mjmwired.net/kernel/Documentation/input/multi-touch-protocol.txtLooks like the linux input layer does effectively the same: send series of events for multitouch.
A sync event to mark the end of the batch is obviously a pretty good idea I'm going to steal.
Some devices seem to be able to attach IDs to the touchpoints. Then you don't have to send the whole set each time but can limit yourself to the ones which did actually change. We should support that too.
Or better yet, delay implementing it until someone actually knows how to support it.
I think we can get sane support into the protocol right from start, and that is much better than adding something afterwards. Just look at the linux input layer document -- some of the loops they have to hop though are there just because multitouch is a extension which came later.
cheers, Gerd
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