Use of different platforms

[Djolivald]

Hi,
In src/deployers/PlatformPluginsDeployer.cpp#L20 only platforms/libqxcb.so is copied over? Is there a way to get other platforms to ship? minimal, offscreen, vnc and alike?
Tried to add them via the EXTRA_QT_PLUGINS env variable but without success.

[TheAssassin]

Which one(s) would you like to include? We could just extend it, or, if needed, add some opt-in feature.

[Djolivald]

I personally would like to add offscreen, but maybe we could use EXTRA_QT_PLUGINS and matching all platforms/*.so as platforms plugins?
Not sure if there is anything more than adding the .so in the package for it to work though.

[TheAssassin]

How large is that offscreen platform .so? Can you please run ldd on it and post the output, too?

[TheAssassin]

It's around 170k on my system, I didn't know that platform even existed. What is it being used for?

I'd suggest to add an opt-in feature for deploying this platform. We could add an environment variable that allows people to choose platform plugins to be deployed along with the good ol' xcb.

[Djolivald]

offscreen is 241K, here is the list for all of them for reference

16K libqeglfs.so*
556K libqlinuxfb.so*
186K libqminimal.so*
232K libqminimalegl.so*
241K libqoffscreen.so*
331K libqvnc.so*
102K libqwayland-egl.so*
 16K libqwayland-generic.so*
105K libqwayland-xcomposite-egl.so*
 83K libqwayland-xcomposite-glx.so*
 33K libqxcb.so*

Output of ldd libqoffscreen.so

        linux-vdso.so.1 (0x00007ffee07b4000)
        libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f4c78aae000)
        libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f4c78985000)
        libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f4c7893e000)
        libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f4c7887f000)
        libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f4c7886a000)
        libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f4c7872d000)
        libQt5Gui.so.5 => /opt/qt/5.12.0/gcc_64/plugins/platforms/./../../lib/libQt5Gui.so.5 (0x00007f4c77f06000)
        libQt5Core.so.5 => /opt/qt/5.12.0/gcc_64/plugins/platforms/./../../lib/libQt5Core.so.5 (0x00007f4c77779000)
        libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f4c776f1000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f4c776ce000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f4c774ed000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4c7739e000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f4c77381000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4c7718f000)
        libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f4c7711c000)
        libexpat.so.1 => /build/libexpat.so.1 (0x00007f4c76ee5000)
        libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f4c76edc000)
        libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f4c76ea4000)
        libz.so.1 => /build/libz.so.1 (0x00007f4c76c85000)
        libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f4c76c5b000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f4c76c55000)
        libicui18n.so.56 => /opt/qt/5.12.0/gcc_64/plugins/platforms/./../../lib/libicui18n.so.56 (0x00007f4c767bc000)
        libicuuc.so.56 => /opt/qt/5.12.0/gcc_64/plugins/platforms/./../../lib/libicuuc.so.56 (0x00007f4c76404000)
        libicudata.so.56 => /opt/qt/5.12.0/gcc_64/plugins/platforms/./../../lib/libicudata.so.56 (0x00007f4c74a1f000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f4c78ce8000)
        libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f4c74967000)
        libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f4c74933000)
        libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f4c7492d000)
        libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f4c74925000)
        libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f4c74909000)

[Djolivald]

It's around 170k on my system, I didn't know that platform even existed. What is it being used for?

I'd suggest to add an opt-in feature for deploying this platform. We could add an environment variable that allows people to choose platform plugins to be deployed along with the good ol' xcb.

I use it to run a qt app in docker (without x11 server). Useful for apps that can be used in cli.

[TheAssassin]

So it's basically an alternative to running the application with a virtual frame buffer with xvfb?

[Djolivald]

So it's basically an alternative to running the application with a virtual frame buffer with xvfb?

I can only hazard a guess, I'd say yes. I'm afraid I don't know more about how this works, and can't find lots documentation on it.

[TheAssassin]

Recently some Wayland support was requested again. I remember we had some experimental support once, then had to remove it again due to stability issues. Your plugin makes us deploy one half of the stuff needed for wayland, the platform plugin. The other half is a bunch of extra plugins which can be deployed with $EXTRA_QT_PLUGINS.