linux-kernel - Re: [PATCH] input: mt: Add an envelope tool type

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Date:	Wed, 8 Dec 2010 17:17:53 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Ping Cheng <pinglinux@...il.com>,
	Chase Douglas <chase.douglas@...onical.com>,
	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: mt: Add an envelope tool type

On Thu, Dec 09, 2010 at 02:12:08AM +0100, Henrik Rydberg wrote:
> >>>
> 
> >>> Is it assumed that the envelop has only two touches comprising it? Or is
> >>> it any number of touches? If it's any number of touches, how does one
> >>> know how many touches it is?
> >>
> >> Those are good questions. Specifying how many touches are in the
> >> envelop makes sense. It also covers rectangle as a special case of
> >> envelop.
> > 
> > I have a feeling that trying to accomodate non-rectangular, more than 2
> > point shapes without using native MT data is over-engineering the
> > problem... Do we have examples other than older generation Elantechs and
> > Synaptics that need envelope notion?
> > 
> 
> 
> Those are the ones targeted so far. Maybe appletouch could be added to the list
> as well. I imagine all drivers will end up using zero, one and two envelope points.

Even ones that fully support independent finger tracking?

-- 
Dmitry
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