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

From: Ping Cheng <pinglinux@gmail.com>
To: Henrik Rydberg <rydberg@euromail.se>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Chase Douglas <chase.douglas@canonical.com>,
	Jiri Kosina <jkosina@suse.cz>,
	linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] input: mt: Add an envelope tool type
Date: Wed, 8 Dec 2010 17:20:43 -0800	[thread overview]
Message-ID: <AANLkTinzyNBT2u2QyFwpbJJDAPK1j5-tJZZzd8Q+eSMS@mail.gmail.com> (raw)
In-Reply-To: <4D002CE8.2060803@euromail.se>

On Wed, Dec 8, 2010 at 5:12 PM, Henrik Rydberg <rydberg@euromail.se> 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.

What are the "points" here? Do you mean the points inside the envelope
or number of envelopes?

Ping