linux-kernel - Re: [PATCH v2] input: mt: Interface and MT

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Message-ID: <20101214043635.GB12059@salty.local>
Date:	Tue, 14 Dec 2010 14:36:36 +1000
From:	Peter Hutterer <peter.hutterer@...-t.net>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Chase Douglas <chase.douglas@...onical.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] input: mt: Interface and MT_TOOL documentation updates

On Tue, Dec 14, 2010 at 12:25:26AM +0100, Henrik Rydberg wrote:
> >> The envelope contacts serve as a way to detect a small area of fingers or a
> 
> >> large area of fingers. There is nothing inherently problematic with having one
> >> or three or more such contacts.
> > 
> > Then I'm more confused :).
> > 
> > I see one problem: devices that report two touch points, (X1, Y1) and
> > (X2, Y2), but in reality the touches could be at (X1, Y2) and (X2, Y1)
> > instead. Using a rectangle helps resolve this issue for panning and
> > pinching, though not for rotation.
> 
> 
> If panning and pinching and rotation could all be recovered properly, then the
> individual contacts could actually have been reconstructed properly in the first
> place. This is the whole point - there is not enough information available for
> rotation to be recovered properly.

can you post an example event stream of the MT_ENVELOPE tool? I'm having
trouble wrapping my head around it.
 
Cheers,
  Peter
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