GNU bug report logs - #39238
26.3; Emacs icons displaying improperly on KDE

Previous Next

To add a comment to this bug, you must first unarchive it, by sending
a message to control AT debbugs.gnu.org, with unarchive 39238 in the body.
You can then email your comments to 39238 AT debbugs.gnu.org in the normal way.

Toggle the display of automated, internal messages from the tracker.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: xs wang <wangxs1989 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.3; Emacs icons displaying improperly on KDE
Date: Wed, 22 Jan 2020 15:41:32 +0800

[Message part 1 (text/plain, inline)]

Problem description:

When I use the Task Switcher in the large icon style in KDE plasma, the
Emacs icon is always displayed in low resolution, like in the link below.

https://i.imgur.com/AV4YsN3.png

Steps to reproduce:

1. Install Emacs on Manjaro KDE edition
2. Use the Plasma Large Icons style for the Task Switcher (System Settings
> Window Management > Task Switcher > Main Window > Visualization > Large
icons)
4. Hit alt-tab


Actual results:

The alt-tab window switcher displays Emacs's icon as an ugly scaled-up
48x48 icon as shown in the above picture link.


Expected results:

The 128x128 icon should be used instead, so that the large icon is pretty
and not pixelated.

The problem occurs because Emacs does not set _NET_WM_ICON_NAME to a
128x128 icon. Because of this, the window manager it not aware of the
high-res icon, and is forced to display a scaled-up version of the largest
icon it is aware of--the 48x48 version. This can be verified by running
`xprop` and targeting Emacs's main window; you will see that the largest
icon it knows about is only 48x48.

For more information and context, see the following:
https://bugs.kde.org/show_bug.cgi?id=351055
https://specifications.freedesktop.org/wm-spec/1.4/ar01s05.html

The same problem have been discussed several times in the reddit, see:
https://www.reddit.com/r/emacs/comments/czhs57/the_emacs_icon_is_pixelated_in_plasma/
https://www.reddit.com/r/kde/comments/cnyuzw/some_icons_in_alt_tab_switcher_are_pixelated_for/

[Message part 2 (text/html, inline)]

Message #8 received at 39238 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: xs wang <wangxs1989 <at> gmail.com>
Cc: 39238 <at> debbugs.gnu.org
Subject: Re: bug#39238: 26.3; Emacs icons displaying improperly on KDE
Date: Wed, 28 Oct 2020 13:39:52 +0100

xs wang <wangxs1989 <at> gmail.com> writes:

> The 128x128 icon should be used instead, so that the large icon is pretty and not
> pixelated.
>
> The problem occurs because Emacs does not set _NET_WM_ICON_NAME to a
> 128x128 icon. Because of this, the window manager it not aware of the high-res
> icon, and is forced to display a scaled-up version of the largest icon it is aware
> of--the 48x48 version. This can be verified by running `xprop` and targeting
> Emacs's main window; you will see that the largest icon it knows about is only
> 48x48.

I don't have a KDE system to test with here -- is this problem still
present in Emacs 28?  If so, would it be possible for you to create a
patch for this problem?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 39238 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: xs wang <wangxs1989 <at> gmail.com>
Cc: 39238 <at> debbugs.gnu.org
Subject: Re: bug#39238: 26.3; Emacs icons displaying improperly on KDE
Date: Tue, 08 Dec 2020 19:10:50 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> I don't have a KDE system to test with here -- is this problem still
> present in Emacs 28?  If so, would it be possible for you to create a
> patch for this problem?

More information was requested, but no response was given within a 
month, so I'm closing this bug report.  If the problem still exists,
please respond to this email and we'll reopen the bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.