From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: dpyinfo
Date: Thu, 10 Dec 2020 15:57:47 +0200
Message-ID: <83sg8d4vc4.fsf@gnu.org>
References: <X9FH7NtbqWg0OR9U@breton.holly.idiocy.org>
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="3417"; mail-complaints-to="usenet@ciao.gmane.io"
Cc: emacs-devel@gnu.org
To: Alan Third <alan@idiocy.org>
Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Dec 10 15:01:40 2020
Return-path: <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Envelope-to: ged-emacs-devel@m.gmane-mx.org
Original-Received: from lists.gnu.org ([209.51.188.17])
	by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1knMVn-0000nd-Tb
	for ged-emacs-devel@m.gmane-mx.org; Thu, 10 Dec 2020 15:01:39 +0100
Original-Received: from localhost ([::1]:38920 helo=lists1p.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.90_1)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1knMVm-00083Q-RN
	for ged-emacs-devel@m.gmane-mx.org; Thu, 10 Dec 2020 09:01:38 -0500
Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54380)
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <eliz@gnu.org>) id 1knMSR-0005VR-AZ
 for emacs-devel@gnu.org; Thu, 10 Dec 2020 08:58:11 -0500
Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:40953)
 by eggs.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <eliz@gnu.org>)
 id 1knMSP-0005sX-HF; Thu, 10 Dec 2020 08:58:09 -0500
Original-Received: from [176.228.60.248] (port=1334 helo=home-c4e4a596f7)
 by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256)
 (Exim 4.82) (envelope-from <eliz@gnu.org>)
 id 1knMSN-0000q3-0g; Thu, 10 Dec 2020 08:58:07 -0500
In-Reply-To: <X9FH7NtbqWg0OR9U@breton.holly.idiocy.org> (message from Alan
 Third on Wed, 9 Dec 2020 21:55:56 +0000)
X-BeenThere: emacs-devel@gnu.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "Emacs development discussions." <emacs-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/emacs-devel>
List-Post: <mailto:emacs-devel@gnu.org>
List-Help: <mailto:emacs-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=subscribe>
Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org
Original-Sender: "Emacs-devel"
 <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Xref: news.gmane.io gmane.emacs.devel:260651
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/260651>

> Date: Wed, 9 Dec 2020 21:55:56 +0000
> From: Alan Third <alan@idiocy.org>
> 
> I've been looking at using the screen's actual DPI setting when
> generating SVG files for bug 45124 and I was wondering if the dpyinfo
> struct is updated as the frame moves from screen to screen? My guess
> is that it's not, and it's only set when the frame is created?

The resolution is set in init_xterm, so I'd expect it to be run
whenever a new display is open, not when a frame is created.  What
happens when one moves from one screen to another, I don't know, but
if they are on the same X display, the resolution indeed doesn't
change, AFAICT.