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: Pixel-based display functions Date: Sat, 07 Feb 2015 16:03:54 +0200 Message-ID: <83egq1byyd.fsf@gnu.org> References: <87ioflq0dz.fsf@building.gnus.org> <54CE2187.9070003@gmx.at> <83lhkhiq8t.fsf@gnu.org> <54CE54A3.1020707@gmx.at> <838ughilmo.fsf@gnu.org> <54CE6BD2.8000402@gmx.at> <8361bliin0.fsf@gnu.org> <83386piiby.fsf@gnu.org> <87oap9yoti.fsf@building.gnus.org> <874mqzvnwo.fsf@building.gnus.org> <83h9uzeb4a.fsf@gnu.org> <87bnl7jrr7.fsf@building.gnus.org> <831tm3dt8u.fsf@gnu.org> <87k2zvgj4d.fsf@building.gnus.org> <83siejcahb.fsf@gnu.org> <87bnl7gh7x.fsf@building.gnus.org> <87zj8qcqjv.fsf@building.gnus.org> <87r3u2cn46.fsf@building.gnus.org> <838ugacfd3.fsf@gnu.org> <87fvaiccjk.fsf@building.gnus.org> <54D5FAD7.1060109@gmx.at> <83pp9maq0m.fsf@gnu.org> <54D604E2.1000401@gmx.at> <83k2ztc29y.fsf@gnu.org> <54D6184E.7020603@gmx.at> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1423317866 25959 80.91.229.3 (7 Feb 2015 14:04:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 7 Feb 2015 14:04:26 +0000 (UTC) Cc: larsi@gnus.org, emacs-devel@gnu.org To: martin rudalics Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Feb 07 15:04:26 2015 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 1YK5zl-0003uZ-MC for ged-emacs-devel@m.gmane.org; Sat, 07 Feb 2015 15:04:25 +0100 Original-Received: from localhost ([::1]:53180 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YK5zl-000505-1M for ged-emacs-devel@m.gmane.org; Sat, 07 Feb 2015 09:04:25 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:46086) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YK5zR-0004wv-UF for emacs-devel@gnu.org; Sat, 07 Feb 2015 09:04:09 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YK5zM-0001x1-70 for emacs-devel@gnu.org; Sat, 07 Feb 2015 09:04:05 -0500 Original-Received: from mtaout21.012.net.il ([80.179.55.169]:33741) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YK5zL-0001wm-VC for emacs-devel@gnu.org; Sat, 07 Feb 2015 09:04:00 -0500 Original-Received: from conversion-daemon.a-mtaout21.012.net.il by a-mtaout21.012.net.il (HyperSendmail v2007.08) id <0NJE00600MPO6P00@a-mtaout21.012.net.il> for emacs-devel@gnu.org; Sat, 07 Feb 2015 16:03:58 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout21.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0NJE006L2N2M5F40@a-mtaout21.012.net.il>; Sat, 07 Feb 2015 16:03:58 +0200 (IST) In-reply-to: <54D6184E.7020603@gmx.at> X-012-Sender: halo1@inter.net.il X-detected-operating-system: by eggs.gnu.org: Solaris 10 X-Received-From: 80.179.55.169 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:182605 Archived-At: > Date: Sat, 07 Feb 2015 14:51:10 +0100 > From: martin rudalics > CC: larsi@gnus.org, emacs-devel@gnu.org > > >> The latter calls `vertical-motion' so this should work indeed. But does > >> `vertical-motion' have to go back to the beginning of a logical line > >> when it's broken into several visual lines? > > > > Yes, it does. There's no other place where the display engine can > > _know_ that the X coordinate is zero. > > > >> This would mean that we'd always have to rescan from the beginning > >> of the logical line for each visual line break > > > > Yes. > > This would get us quadratic time. We should stay linear. The only way to stay linear is to display the entire physical line in one go.