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

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Message-ID: <4D00361D.4000603@euromail.se>
Date:	Thu, 09 Dec 2010 02:51:25 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Mohamed Ikbel Boulabiar <boulabiar@...il.com>
CC:	Ping Cheng <pinglinux@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...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 12/09/2010 02:38 AM, Mohamed Ikbel Boulabiar wrote:

> On Thu, Dec 9, 2010 at 1:06 AM, Ping Cheng <pinglinux@...il.com> wrote:
>> No, we are not talking about non-rectangular shape here. Envelop is
>> always a rectangle. By rectangle above, I meant 2 touches.
>>
>> An envelop that includes number of touches offers us more information
>> than a rectangle does
> 
> Can we have more information that just a rect ? An ellipse for exemple.
> Can we get this information at least from synaptics touchpads?


Unfortunately not. Chris Bagwell and myself have been experimenting with quite a
few different approaches to extract touch information from the synaptics pads.
The present approach, to extract the bounding rectangle, is the best we can do,
I am afraid - at least with the information unveiled in Takashi's original
patch. In particular, rotation information is not reliably extractable.

Henrik
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