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 19:32:10 +0200 Message-ID: <83pnqlsb8l.fsf@gnu.org> References: <4be02093-6e31-bfde-7d11-5900c7e02668@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="91202"; 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 18:37:44 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 1h6f9r-000NSD-1B for ged-emacs-devel@m.gmane.org; Wed, 20 Mar 2019 18:37:43 +0100 Original-Received: from localhost ([127.0.0.1]:51014 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h6f9j-0003KZ-9h for ged-emacs-devel@m.gmane.org; Wed, 20 Mar 2019 13:37:35 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:44560) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h6f4Y-0007p8-RW for emacs-devel@gnu.org; Wed, 20 Mar 2019 13:32:16 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:58978) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h6f4Y-0003Kp-LZ; Wed, 20 Mar 2019 13:32:14 -0400 Original-Received: from [176.228.60.248] (port=2608 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1h6f4X-0006lA-Ox; Wed, 20 Mar 2019 13:32:14 -0400 In-reply-to: <4be02093-6e31-bfde-7d11-5900c7e02668@gmail.com> (message from =?utf-8?Q?Cl=C3=A9ment?= Pit-Claudel on Wed, 20 Mar 2019 10:55:43 -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:234415 Archived-At: > From: Clément Pit-Claudel > Date: Wed, 20 Mar 2019 10:55:43 -0400 > > Users on Flycheck are complaining about poor readability of our fringe bitmaps on high-DPI monitors, as the bitmaps look tiny on such screens. An easy fix is to double the size of the bitmap, but it leaves users of low-DPI monitors in the cold. A trickier fix would be to dynamically detect the current monitor's density, and pick the appropriate bitmap accordingly, but I'm not entirely sure how to do detect these high-DPI monitors: > > - x-display-monitor-attributes-list seems OK, but looks more complex than what we need (based on looking at the C code) — is it OK to call it repeatedly to figure out the current monitor's density for a given frame? That'd be very inelegant, IMO. 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. > Also, how do applications typically deal with frames being moved from a low-DPI monitor to a high-DPI one? Is that an issue in practice? If a frame can be moved from high-DPI to low-DPI, then I guess we will need to query the low-level interfaces which report that in update_frame or thereabouts.