From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Torokhov Subject: Re: [PATCH] input: mt: Add an envelope tool type Date: Wed, 8 Dec 2010 17:17:53 -0800 Message-ID: <20101209011752.GH15294@core.coreip.homeip.net> References: <1291721340-22652-1-git-send-email-rydberg@euromail.se> <4CFFC3C2.1080905@canonical.com> <20101208235805.GE15294@core.coreip.homeip.net> <4D002CE8.2060803@euromail.se> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-gy0-f174.google.com ([209.85.160.174]:47222 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751823Ab0LIBSF (ORCPT ); Wed, 8 Dec 2010 20:18:05 -0500 Content-Disposition: inline In-Reply-To: <4D002CE8.2060803@euromail.se> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Henrik Rydberg Cc: Ping Cheng , Chase Douglas , Jiri Kosina , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org On Thu, Dec 09, 2010 at 02:12:08AM +0100, Henrik Rydberg 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. Even ones that fully support independent finger tracking? -- Dmitry