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: Wed, 20 Mar 2019 21:44:33 +0200 Message-ID: <83h8bxs53y.fsf@gnu.org> References: <4be02093-6e31-bfde-7d11-5900c7e02668@gmail.com> <83pnqlsb8l.fsf@gnu.org> <59f034d0-3473-0a83-ccf6-1a6fe446964c@gmail.com> 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="102754"; 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 Wed Mar 20 20:45:02 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 1h6h94-000Qem-Ot for ged-emacs-devel@m.gmane.org; Wed, 20 Mar 2019 20:45:02 +0100 Original-Received: from localhost ([127.0.0.1]:52396 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h6h93-0005Q4-Qa for ged-emacs-devel@m.gmane.org; Wed, 20 Mar 2019 15:45:01 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:36786) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h6h8x-0005Pm-Ds for emacs-devel@gnu.org; Wed, 20 Mar 2019 15:44:56 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:33013) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h6h8x-0006cK-4Y; Wed, 20 Mar 2019 15:44:55 -0400 Original-Received: from [176.228.60.248] (port=2906 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1h6h8v-000145-GM; Wed, 20 Mar 2019 15:44:54 -0400 In-reply-to: <59f034d0-3473-0a83-ccf6-1a6fe446964c@gmail.com> (message from =?utf-8?Q?Cl=C3=A9ment?= Pit-Claudel on Wed, 20 Mar 2019 15:34:26 -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:234420 Archived-At: > Cc: emacs-devel@gnu.org > From: Clément Pit-Claudel > Date: Wed, 20 Mar 2019 15:34:26 -0400 > > > Instead, I think when a frame is created, we should record its > > high-DPI state in the frame structure, or maybe in the frame's > > parameters, and then use that when we prepare the fringe bitmaps for > > display. > > That would be nice. In fact, we already have code to detect high-DPI displays in C, in x_get_scale_factor in xterm.c (used to scale wavy underlines). Would the way to go be to record the value returned by this function in the frame's parameters? The frame's parameters is a better way if we think such a parameter will be useful to Lisp programs, and calling a function for that is too much overhead. Otherwise, a simple field of 'struct frame' will be somewhat less hassle, because you don't need to mess with the likes of frame-parameter to teach them about this new parameter. But either way, the job is not hard. > I guess that another approach would be to support scalable images in the fringe, rather than bitmaps. If the fringe image was SVG instead of a bitmap, for example, we could make it fill the whole width of the fringe. > > Do you have a sense of how hard that would be? No, I don't, sorry. And in any case, I don't think we should rely on SVG support for a feature as basic as fringe bitmaps, since we use that in the most basic display on GUI frames, whereas some people intentionally build Emacs without SVG support.