Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757975Ab0LNEgu (ORCPT ); Mon, 13 Dec 2010 23:36:50 -0500 Received: from leo.clearchain.com ([199.73.29.74]:16848 "EHLO mail.clearchain.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757345Ab0LNEgt (ORCPT ); Mon, 13 Dec 2010 23:36:49 -0500 Date: Tue, 14 Dec 2010 14:36:36 +1000 From: Peter Hutterer To: Henrik Rydberg Cc: Chase Douglas , Dmitry Torokhov , Jiri Kosina , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] input: mt: Interface and MT_TOOL documentation updates Message-ID: <20101214043635.GB12059@salty.local> References: <1292001842-5000-1-git-send-email-rydberg@euromail.se> <4D065BDE.5020107@canonical.com> <4D068E3C.8080100@euromail.se> <4D06A60D.7010409@canonical.com> <4D06AB66.8090909@euromail.se> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4D06AB66.8090909@euromail.se> User-Agent: Mutt/1.5.21 (2010-09-15) X-Greylist: Sender is SPF-compliant, not delayed by milter-greylist-4.0.1 (mail.clearchain.com [127.0.0.1]); Tue, 14 Dec 2010 15:06:40 +1030 (CST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1231 Lines: 29 On Tue, Dec 14, 2010 at 12:25:26AM +0100, Henrik Rydberg wrote: > >> The envelope contacts serve as a way to detect a small area of fingers or a > > >> large area of fingers. There is nothing inherently problematic with having one > >> or three or more such contacts. > > > > Then I'm more confused :). > > > > I see one problem: devices that report two touch points, (X1, Y1) and > > (X2, Y2), but in reality the touches could be at (X1, Y2) and (X2, Y1) > > instead. Using a rectangle helps resolve this issue for panning and > > pinching, though not for rotation. > > > If panning and pinching and rotation could all be recovered properly, then the > individual contacts could actually have been reconstructed properly in the first > place. This is the whole point - there is not enough information available for > rotation to be recovered properly. can you post an example event stream of the MT_ENVELOPE tool? I'm having trouble wrapping my head around it. Cheers, Peter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/