wayland: use server-side decorations if possible

[mahkoh]

This makes IntelliJ use native SSD on KDE, Sway, and Jay. On GNOME, it continues to use the existing CSD.

This solves the styling issue on compositors supporting SSD.

[mkartashev]

Thank you for the patch! I will test it out and get back to you

[mkartashev]

How does server-side decorations interact with the window size? I'm particularly concerned about the values passed to xdg_surface_set_window_geometry(); I don't see how they can be adjusted, but maybe simply skip this call so it does not interfere with server-side decorations?

[mkartashev]

What is the performance impact of using server-side decorations together with the shared memory buffer? Can you run SwingMark and RenderPerf with and without the patch and post the results?

[mahkoh]

How does server-side decorations interact with the window size?

xdg_surface_set_window_geometry is always called with the width/height from the configure event. These values are not affected by presence of client-side decorations. Client-side decorations only create an inset which causes the window contents (excluding the CSD) to be rendered into a smaller part of the surface.

What is the performance impact of using server-side decorations together with the shared memory buffer?

It should not make a difference but I will take a look.

[mkartashev]

How does server-side decorations interact with the window size?

xdg_surface_set_window_geometry is always called with the width/height from the configure event. These values are not affected by presence of client-side decorations. Client-side decorations only create an inset which causes the window contents (excluding the CSD) to be rendered into a smaller part of the surface.

This aligns with my understanding of CSD and this is why I specifically asked about server-side decorations. I don't know if the server counts the size the decorations it provides towards the window geometry or not.

[mahkoh]

SwingMark is essentially unchanged with roughly the following results:

Starting SwingMark
SwingMark Test started at Wed May 22 10:52:05 CEST 2024
Program will automatically terminate after last run
Setting L&F to: javax.swing.plaf.metal.MetalLookAndFeel
Startup Time: 229
Sub-Menus = 568   (Paint = 0)
TextArea = 190   (Paint = 691)
Sliders = 148   (Paint = 501)
Lists = 152   (Paint = 493)
Table Rows = 160   (Paint = 213)
Tree = 321   (Paint = 756)
Score: 1813

I was not able to get RenderPerfTest to work before or after these changes. After starting it, it just keeps asking to capture the output. If you allow it to capture the output, it just asks again.

I don't know if the server counts the size the decorations it provides towards the window geometry or not.

It doesn't. If SSD is used, the geometry should be set to the size of the window contents.

[mahkoh]

I was not able to get RenderPerfTest to work before or after these changes.

Strike that. I had forgotten to pass -Dawt.toolkit.name=WLToolkit to this test. The results are the same before and after this PR.

[mkartashev]

On KDE, this is how IDEA's "Search Everywhere" window look with this patch:

It definitely doesn't need any decorations, but those are present for some reason.

I understand that this protocol doesn't allow for any type of configuration of the decorations aside from on/off, but having a maximized button on a dialog feels weird. It also works weird: when toggled, the IDEA's About dialog, for example, does not get reset into its original shape and size, so its content gets distorted.

Did you have any experience working with libdecor? Maybe it provides more control over what should and should not be on the title bar of a window?

Notice also the icon that is located at the top left corner: it is the generic Wayland icon instead of the product's icon. Do you have an idea about how to fix that? (FWIW, Firefox's window also has the same icon).

[mkartashev]

In addition to the always-present "maximize" button, it seems that decorating any window will make it resizable, for which many, if not all, IDEA dialogs are not prepared.

[mahkoh]

It definitely doesn't need any decorations, but those are present for some reason.

I hadn't considered that you might want to have undecorated toplevels. This should now be fixed.

[mahkoh]

Notice also the icon that is located at the top left corner: it is the generic Wayland icon instead of the product's icon. Do you have an idea about how to fix that? (FWIW, Firefox's window also has the same icon).

There is currently no API to set an application icon. Some compositors read the icon from desktop files.

[mkartashev]

@mahkoh All this Wayland-related work is intended to be committed to OpenJDK under the umbrella of project Wakefield some day. Since this patch is not created by a JetBrains employee, we won't be able to push it with the rest of the code, which will create some merging problems in the future. Would you be able to contribute this patch directly to OpenJDK so I can then pull it from there?

[mahkoh]

Since this patch is not created by a JetBrains employee, we won't be able to push it with the rest of the code, which will create some merging problems in the future.

I have signed the CLA which gives JetBrains a license to distribute the code under any license. Is this not sufficient?

[mkartashev]

I have signed the CLA which gives JetBrains a license to distribute the code under any license. Is this not sufficient?

No.

[mahkoh]

So should I create a PR in https://github.com/openjdk/wakefield/tree/jdk21.0.1-wayland?

[mkartashev]

Are you an OpenJDK contributor? Have you signed https://oca.opensource.oracle.com/ already?

[mahkoh]

I have now.

[mkartashev]

Then you can open a PR against https://github.com/openjdk/wakefield/tree/jdk21.0.1-wayland

[mkartashev]

Notice also the icon that is located at the top left corner: it is the generic Wayland icon instead of the product's icon. Do you have an idea about how to fix that? (FWIW, Firefox's window also has the same icon).

FWIW, this is solved by placing jetbrains-idea-ce.desktop (or whatever your IDE is) into ~/.local/share/applications/.

[mahkoh]

openjdk/wakefield#7

[mkartashev]

This will be further tracked as openjdk/wakefield#7. Closing.