From mboxrd@z Thu Jan  1 00:00:00 1970
From: Henrik Rydberg <rydberg@euromail.se>
Subject: Re: [PATCH] input: mt: Add an envelope tool type
Date: Thu, 09 Dec 2010 02:12:08 +0100
Message-ID: <4D002CE8.2060803@euromail.se>
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To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Ping Cheng <pinglinux@gmail.com>, Chase Douglas <chase.douglas@canonical.com>, Jiri Kosina <jkosina@suse.cz>, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
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>>>

>>> 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