From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Redisplay problems? Date: Wed, 26 Mar 2014 17:28:53 +0200 Message-ID: <83d2h9yo5m.fsf@gnu.org> References: <83a9ck6lzf.fsf@gnu.org> <83eh1v5y53.fsf@gnu.org> <83y5024r1w.fsf@gnu.org> <83ior6489a.fsf@gnu.org> <834n2q43os.fsf@gnu.org> <83vbv62gr7.fsf@gnu.org> <83txao1c8n.fsf@gnu.org> <83k3bj1otm.fsf@gnu.org> <838urz1jjg.fsf@gnu.org> <834n2n0wbe.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1395847742 14271 80.91.229.3 (26 Mar 2014 15:29:02 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 26 Mar 2014 15:29:02 +0000 (UTC) Cc: rudalics@gmx.at, christian@defun.dk, cloos@jhcloos.com, kanru@kanru.info, emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Mar 26 16:29:10 2014 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WSplO-00026L-33 for ged-emacs-devel@m.gmane.org; Wed, 26 Mar 2014 16:29:10 +0100 Original-Received: from localhost ([::1]:48701 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WSplN-000697-Mu for ged-emacs-devel@m.gmane.org; Wed, 26 Mar 2014 11:29:09 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:41860) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WSplH-00068V-Il for emacs-devel@gnu.org; Wed, 26 Mar 2014 11:29:07 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WSplD-0004yU-Gt for emacs-devel@gnu.org; Wed, 26 Mar 2014 11:29:03 -0400 Original-Received: from mtaout29.012.net.il ([80.179.55.185]:42986) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WSplD-0004yI-8E for emacs-devel@gnu.org; Wed, 26 Mar 2014 11:28:59 -0400 Original-Received: from conversion-daemon.mtaout29.012.net.il by mtaout29.012.net.il (HyperSendmail v2007.08) id <0N3100300UOW0F00@mtaout29.012.net.il> for emacs-devel@gnu.org; Wed, 26 Mar 2014 17:31:40 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by mtaout29.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N31002N4V4RF420@mtaout29.012.net.il>; Wed, 26 Mar 2014 17:31:40 +0200 (IST) In-reply-to: X-012-Sender: halo1@inter.net.il X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 80.179.55.185 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:171006 Archived-At: > From: Stefan Monnier > Cc: rudalics@gmx.at, christian@defun.dk, kanru@kanru.info, cloos@jhcloos.com, > emacs-devel@gnu.org > Date: Tue, 25 Mar 2014 09:10:44 -0400 > > Hmm... I guess it depends on what kind of drawing operations we use. > E.g. if the redisplay optimizations include usage of "block move" > operations, then indeed, if the redisplay happens before the expose, we > may end up moving not-yet-drawn (i.e. incorrect/garbage) pixels. > > Do we use things like "block move"? Not sure what you mean by "block move". From the name and the context, it sounds like you are talking about actual drawing, i.e. on a level that underlies the display back-ends in xterm.c, w32term.c etc. If so, that's way below the level of redisplay optimizations that are in xdisp.c and even in dispnew.c, which are both device-independent. But maybe I misunderstand what you mean.