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

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Message-ID: <4D002CE8.2060803@euromail.se>
Date:	Thu, 09 Dec 2010 02:12:08 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
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

>>>

>>> 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.

Henrik
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