From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rafi Rubin Subject: Re: [PATCH 4/4] hid-ntrig: Contact tracking Date: Sat, 20 Feb 2010 12:48:41 -0500 Message-ID: <4B802079.8000006@seas.upenn.edu> References: <1265933946-8318-1-git-send-email-rafi@seas.upenn.edu> <1265944448-23436-1-git-send-email-rafi@seas.upenn.edu> <1265944448-23436-2-git-send-email-rafi@seas.upenn.edu> <1265944448-23436-3-git-send-email-rafi@seas.upenn.edu> <1265944448-23436-4-git-send-email-rafi@seas.upenn.edu> <45cc95261002200025m378e1a80rec09bde5673a6060@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from stag.seas.upenn.edu ([158.130.70.79]:42260 "EHLO stag.seas.upenn.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756760Ab0BTRsz (ORCPT ); Sat, 20 Feb 2010 12:48:55 -0500 In-Reply-To: <45cc95261002200025m378e1a80rec09bde5673a6060@mail.gmail.com> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Mohamed Ikbel Boulabiar Cc: linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, jkosina@suse.cz, chatty@enac.fr -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 02/20/10 03:25, Mohamed Ikbel Boulabiar wrote: > Hi, > > What happens when two fingers approaches then separates ? Given the way the hardware numbers the contacts and the way that code processes them, the persistent id would go to the finger closer to the bottom of the screen and the other one would get assigned an inactive id. Similarly I think the lower finger would most likely determine the id of the merged contact. Not entirely certain. Longer term tracking for a more satisfying and reliable tracking takes more processing. I think that's why the protocol doc suggests that userspace should be responsible for hardware that doesn't track. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuAIHkACgkQwuRiAT9o609k+QCcCHXx/DRuhEOWpcWaZrTLfubh cPAAoL+TMEiNtil9hh/KX5oJIKejchNT =oQbI -----END PGP SIGNATURE-----