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Posted to commits@netbeans.apache.org by "Eirik Bakke (Jira)" <ji...@apache.org> on 2020/11/18 21:35:00 UTC
[jira] [Commented] (NETBEANS-2360) HiDPI scaling not applied
automatically on Linux
[ https://issues.apache.org/jira/browse/NETBEANS-2360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17235014#comment-17235014 ]
Eirik Bakke commented on NETBEANS-2360:
---------------------------------------
As of the latest Ubuntu release, Ubuntu 20.04, the "Displays" control panel has a "Scale" factor option. I believe this sets a gnome property known as "Xft/DPI". Java does not seem to react to this property at the GraphicsConfiguration level, however; that should probably be reported as an OpenJDK bug/feature request. Meanwhile, GDK_SCALE works fine.
Nevertheless, the default LAF on Linux (GTK+) gets into trouble when Xft/DPI is set, because some UI elements end up being scaled and others don't.
What does work is to set GDK_SCALE and use FlatLAF. In that case, all the UI elements appear properly scaled, regardless of whether Xft/DPI is set in addition.
Perhaps FlatLAF should be made the default LAF on Linux, and the NetBeans startup script should set GDK_SCALE automatically based on the value of Xft/DPI.
> HiDPI scaling not applied automatically on Linux
> ------------------------------------------------
>
> Key: NETBEANS-2360
> URL: https://issues.apache.org/jira/browse/NETBEANS-2360
> Project: NetBeans
> Issue Type: Improvement
> Components: platform - Launchers&CLI
> Affects Versions: 11.0
> Environment: Kubuntu 18.03
> Oracle JDK 11.0.2
> Reporter: Eirik Bakke
> Priority: Major
> Labels: HiDPI, Linux
> Attachments: kubunt.jpg
>
>
> Running NetBeans 11 on Kubuntu 18.03, GUI text size does not seem to take into account the system's default HiDPI scaling. This was reported in a Twitter thread on https://twitter.com/nicktail/status/1114789604337405952 . Note that Window decorations seem to be the correct size.
> Setting the GDK_SCALE environment variable seems to fix the problem, if I understand the originally reporter correctly. This could probably be done easily from the NetBeans launcher script (netbeans/bin). But it wouldn't fix the problem in multi-monitor setups. We should investigate what could be done to make scaling work properly in multi-monitor setups involving one HiDPI screen and one non-HiDPI screen.
> Before merging a patch to the launcher script, it should be tested on a couple of different Linux environments, using both HiDPI and non-HiDPI screens. Note that the UNIX launcher script is also used on MacOS.
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