Review Request 119822: QScreen backend for libkscreen

[Sebastian Kügler]

> On Aug. 18, 2014, 11:55 a.m., Àlex Fiestas wrote:
> > autotests/testqscreenbackend.cpp, line 66
> > <https://git.reviewboard.kde.org/r/119822/diff/1/?file=306029#file306029line66>
> >
> >     If we don't have a config even though we correctly configured the backend, should not we fail? a QSKIP might be unnoticed (specially in jenkins).
> 
> Sebastian Kügler wrote:
>     Until we can be sure to have a config running (i.e. either an X or a Wayland server), this would mean we'd have failing tests. I'm happy to remove the SKIP once we have the CI / tooling caught up to bring up a server for us, until then, no use in having it not SKIP.
> 
> Ben Cooksley wrote:
>     The CI system already starts an Xvfb server - although this doesn't support xrandr...
>     Plain X itself can't be run headless from what I understand.
> 
> Sebastian Kügler wrote:
>     How can I start an Xvfb from the test there? 
>     I'm trying right now to use Xvfb for the test, in the future it would also be nice to be able to start a Wayland compositor for the test. 
>     
>     As the sam (SKIP) is done in the xrandrbackend test as well, I'll drop this issue for now, as to not block the code from going in.
> 
> Martin Gräßlin wrote:
>     The CI system starts an Xvfb and it's set up to DISPLAY=:0. If you need more control for starting another X server check the kwindowsystem auto tests. If you want to start a Weston check out KWin's auto tests

Awesome. Thanks.


- Sebastian


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On Aug. 20, 2014, 4:35 p.m., Sebastian Kügler wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/119822/
> -----------------------------------------------------------
> 
> (Updated Aug. 20, 2014, 4:35 p.m.)
> 
> 
> Review request for Plasma and Solid.
> 
> 
> Repository: libkscreen
> 
> 
> Description
> -------
> 
> This patch adds a QScreen backend to libkscreen.
> 
> This is useful to avoid a dependency on XRandR (at build time) and a running X server at runtime.
> 
> The backend itself is read-only and kept simple. It only reports the basic necessities (which is what QScreen provides).
> 
> The changes are kept to the backends/qscreen directory, so no API has been touched. The changes outside of that directory are autotests, tests, and a fallback to the qscreen backend non non-X11 platforms. The latter will automatically make libkscreen work on Wayland (as far as QScreen allows us to, so r-o). This case otherwise just crashes, and the XRandR backend can't work. If the user specifies the backend using the KSCREEN_BACKEND env var, it will be respected, the automatism only triggers when no backend is explicitely specified. I've also added apidocs in some files, but again, no functional changes.
> 
> The plan is to augment this also with a native Wayland backend, which will take a bit longer to complete (more complex, it's r-w, I have to learn Wayland APIs). That backend is work-in-progress in the sebas/wayland branch. The QScreen backend allows us to test and run our code under Wayland, without crashing, so we can continue the port while a native Wayland backend is conceived.
> 
> You can find the code for this QScreen backend in sebas/qscreen if you'd like to give it a try.
> 
> 
> Diffs
> -----
> 
>   tests/testplugandplay.cpp PRE-CREATION 
>   tests/testpnp.h PRE-CREATION 
>   tests/testpnp.cpp PRE-CREATION 
>   autotests/CMakeLists.txt 18b93c0 
>   autotests/testqscreenbackend.cpp PRE-CREATION 
>   backends/CMakeLists.txt a827ee8 
>   backends/abstractbackend.h 7ffe627 
>   backends/qscreen/CMakeLists.txt PRE-CREATION 
>   backends/qscreen/qscreenbackend.h PRE-CREATION 
>   backends/qscreen/qscreenbackend.cpp PRE-CREATION 
>   backends/qscreen/qscreenconfig.h PRE-CREATION 
>   backends/qscreen/qscreenconfig.cpp PRE-CREATION 
>   backends/qscreen/qscreenoutput.h PRE-CREATION 
>   backends/qscreen/qscreenoutput.cpp PRE-CREATION 
>   src/CMakeLists.txt 4606862 
>   src/backendloader.cpp d6ccdff 
>   src/config.h 10a8f1e 
>   tests/CMakeLists.txt 86efedc 
>   tests/printconfig.cpp 249f123 
>   backends/qscreen/qscreenscreen.h PRE-CREATION 
>   backends/qscreen/qscreenscreen.cpp PRE-CREATION 
> 
> Diff: https://git.reviewboard.kde.org/r/119822/diff/
> 
> 
> Testing
> -------
> 
> * Ran autotest "testqscreenbackend" under X11 and Wayland -- all pass
> * Tested hotplugging (using included testpnp app) under X11
> * Started plasmashell with KSCREEN_BACKEND=QScreen under X11
> * Started kcmshell5 kcm_kscreen
> 
> All of these work correctly in my tests, no strange behaviour observed.
> 
> 
> Thanks,
> 
> Sebastian Kügler
> 
>

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