From mboxrd@z Thu Jan 1 00:00:00 1970 From: Henrik Rydberg Subject: Re: [PATCH] input: mt: Add an envelope tool type Date: Thu, 09 Dec 2010 02:51:25 +0100 Message-ID: <4D00361D.4000603@euromail.se> References: <1291721340-22652-1-git-send-email-rydberg@euromail.se> <4CFFC3C2.1080905@canonical.com> <20101208235805.GE15294@core.coreip.homeip.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Mohamed Ikbel Boulabiar Cc: Ping Cheng , Dmitry Torokhov , Chase Douglas , Jiri Kosina , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-input@vger.kernel.org On 12/09/2010 02:38 AM, Mohamed Ikbel Boulabiar wrote: > On Thu, Dec 9, 2010 at 1:06 AM, Ping Cheng 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