From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: What is the proper way to scale fringe-bitmaps for high-DPI displays? Date: Thu, 21 Mar 2019 05:32:21 +0200 Message-ID: <83ftrg6gxm.fsf@gnu.org> References: <4be02093-6e31-bfde-7d11-5900c7e02668@gmail.com> <83pnqlsb8l.fsf@gnu.org> <59f034d0-3473-0a83-ccf6-1a6fe446964c@gmail.com> <83h8bxs53y.fsf@gnu.org> <83ftrhs3lu.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="179669"; mail-complaints-to="usenet@blaine.gmane.org" Cc: emacs-devel@gnu.org To: =?utf-8?Q?Cl=C3=A9ment?= Pit-Claudel Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Mar 21 04:32:33 2019 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1h6oRT-000kb0-6j for ged-emacs-devel@m.gmane.org; Thu, 21 Mar 2019 04:32:31 +0100 Original-Received: from localhost ([127.0.0.1]:58945 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h6oRR-0004NC-UN for ged-emacs-devel@m.gmane.org; Wed, 20 Mar 2019 23:32:29 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:54102) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h6oRL-0004Mw-Tq for emacs-devel@gnu.org; Wed, 20 Mar 2019 23:32:24 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:40254) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h6oRL-0008Lh-Jy; Wed, 20 Mar 2019 23:32:23 -0400 Original-Received: from [176.228.60.248] (port=3155 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1h6oRL-0006FI-47; Wed, 20 Mar 2019 23:32:23 -0400 In-reply-to: (message from =?utf-8?Q?Cl=C3=A9ment?= Pit-Claudel on Wed, 20 Mar 2019 17:17:16 -0400) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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" Xref: news.gmane.org gmane.emacs.devel:234446 Archived-At: > Cc: emacs-devel@gnu.org > From: Clément Pit-Claudel > Date: Wed, 20 Mar 2019 17:17:16 -0400 > > >> Oh, so Emacs' C code would scale the bitmaps? I expected the Lisp code would do that. > > > > Fringes are displayed in C. Doing this in Lisp will produce > > flickering, I'm afraid. > > I thought the C code would read the scaling factor and set the bitmap accordingly just once, when creating overlays or applying text properties. But you were saying that a frame can move from a high-DPI terminal to a low-DPI one, which seems to mean we cannot compute that just once. And besides, there are fringe bitmaps that we display regardless of any overlays and text properties (e.g., truncation and continuation indicators), which are displayed directly from C.