[Kde-hardware-devel] Review Request 126381: kwayland backend for libkscreen

[Daniel Vrátil]

> On Dec. 16, 2015, 10:08 a.m., Martin Gräßlin wrote:
> > backends/kwayland/waylandbackend.cpp, line 46
> > <https://git.reviewboard.kde.org/r/126381/diff/2/?file=423833#file423833line46>
> >
> >     where does it get deleted?
> 
> Sebastian Kügler wrote:
>     Nowhere. :/
>     
>     This is in line with other backends, though. If it's to be fixed (Dan?), this would need to be done globally. For this backend, it's one of the idiosyncracies of libkscreen we have to live with.
> 
> Daniel Vrátil wrote:
>     WaylandBackend inherits KScreen::AbstractBackend which does have a virtual destructor that should get called automagically when we unload the backend - so you could just delete the WaylandConfig there and reset s_internalConfig to nullptr.

Looking even more into it, there's really no need for WaylandConfig to be static, could be just member of the WaylandBackend (as long as you have a way to retrieve the pointer from wherever in code you need to).

There is no need for your backend to use the same lousy architecture we have in XRandR and which has been around since day one (XRandR backend was originally very C-ish, with everything being static and global).


- Daniel


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On Dec. 16, 2015, 3:05 a.m., Sebastian Kügler wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/126381/
> -----------------------------------------------------------
> 
> (Updated Dec. 16, 2015, 3:05 a.m.)
> 
> 
> Review request for Plasma, Solid, Daniel Vrátil, and Martin Gräßlin.
> 
> 
> Repository: libkscreen
> 
> 
> Description
> -------
> 
> This adds a kwayland backend to libkscreen.
> 
> This backend uses KWayland's OutputManagement protocol for enlisting and
> configuring devices.
> 
> Enlisting outputs
> 
> KScreen's outputs are created from KWayland::Client::OutputDevice objects,
> they copy the data into kscreen's Outputs, and update these objects. A list
> of outputs is requested from the client Registry object.
> 
> Configuring outputs
> 
> The backend asks the global OutputManagement interface for an OutputConfiguration
> object, then sets the changes per outputdevice on this object, and asks the
> compositor to apply() this configuration.
> 
> For this to work, the compositor should support the Wayland org_kde_kwin_outputdevice
> and org_kde_kwin_outputmanagement protocols, for example through
> KWayland::Server classes OutputDevice, OutputManagmenent and OuputConfiguration.
> 
> General working
> 
> WaylandBackend creates a global static internal config, available through
> WaylandBackend::internalConfig(). WaylandConfig binds to the wl_registry
> callbacks and catches org_kde_kwin_outputdevice creation and destruction.
> It passes org_kde_kwin_outputdevice creation and removal on to
> WB::internalConfig() to handle its internal data representation as WaylandOutput.
> WaylandOutput binds to org_kde_kwin_outputdevice's callback, and gets notified
> of geometry and modes, including changes. WaylandOutput administrates the
> internal representation of these objects, and invokes the global notifier,
> which then runs the pointers it holds through the updateK* methods in
> Wayland{Screen,Output,...}.
> 
> KScreen:{Screen,Output,Edid,Mode} objects are created from the internal
> representation as requested (usually triggered by the creation of a
> KScreen::Config object through KScreen::Config::current()). As with other
> backends, the objects which are handed out to the lib's user are expected
> to be deleted by the user, the backend only takes ownership of its internal
> data representation objects.
> 
> 
> Diffs
> -----
> 
>   CMakeLists.txt efac5ce 
>   autotests/CMakeLists.txt 07b7bbc 
>   autotests/configs/default.json 3ac3e19 
>   autotests/testconfigserializer.cpp 1af3069 
>   autotests/testkwaylandbackend.cpp PRE-CREATION 
>   autotests/testkwaylandconfig.cpp PRE-CREATION 
>   backends/CMakeLists.txt ff5d751 
>   backends/kwayland/CMakeLists.txt PRE-CREATION 
>   backends/kwayland/README.txt PRE-CREATION 
>   backends/kwayland/waylandbackend.h PRE-CREATION 
>   backends/kwayland/waylandbackend.cpp PRE-CREATION 
>   backends/kwayland/waylandconfig.h PRE-CREATION 
>   backends/kwayland/waylandconfig.cpp PRE-CREATION 
>   backends/kwayland/waylandoutput.h PRE-CREATION 
>   backends/kwayland/waylandoutput.cpp PRE-CREATION 
>   backends/kwayland/waylandscreen.h PRE-CREATION 
>   backends/kwayland/waylandscreen.cpp PRE-CREATION 
>   src/backendmanager.cpp 89ae31e 
>   src/config.cpp e8b8a8f 
>   src/screen.h 4cd1e82 
>   tests/CMakeLists.txt d5e41d5 
>   tests/kwayland/CMakeLists.txt PRE-CREATION 
>   tests/kwayland/main.cpp PRE-CREATION 
>   tests/kwayland/waylandconfigreader.h PRE-CREATION 
>   tests/kwayland/waylandconfigreader.cpp PRE-CREATION 
>   tests/kwayland/waylandtestserver.h PRE-CREATION 
>   tests/kwayland/waylandtestserver.cpp PRE-CREATION 
> 
> Diff: https://git.reviewboard.kde.org/r/126381/diff/
> 
> 
> Testing
> -------
> 
> The patch contains a test server, which is used for the autotests.
> 
> The test server uses KWayland's server classes and is set up from the json config data we use for the other tests. That means that the backends runs against a real server to test everything.
> 
> I also tested the kscreen UI, which also works as expected.
> 
> 
> Thanks,
> 
> Sebastian Kügler
> 
>

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