Review Request 125309: Support multiple X servers in the NETWM classes

[Martin Gräßlin]

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Ship it!


Ship It!

- Martin Gräßlin


On Sept. 28, 2015, 5:45 p.m., Thomas Lübking wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/125309/
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> (Updated Sept. 28, 2015, 5:45 p.m.)
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> 
> Review request for KDE Frameworks and Martin Gräßlin.
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> Repository: kwindowsystem
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> Description
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> alteration review #125259 minus the autotests
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> Significant difference is the creation and handling of the Atom enum.
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> 1. Net::Utf8 makes no sense
> 2. Net::WmFoo re/adds ambiguity between _NET_WM and WM_, notably on _STATE (there's nothing such as XA_WM_STATE)
> 3. the most "important" grouping is whether it's WM_, NET_WM_, NET_, KDE_NET_, or ... UTF8, I'm not sure why one would add more enums (since this is internal API and the resolved type will always be xcb_atom_t - in worst case we run into errors on comparing the enums
> 4. I wanted to get rid of the explicit counter variable as well as any loose assignment between atom variable/enum and string.
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> So far on first creation of a NETRootInfo or NETWinInfo a static
> initialization of atoms was performed. This meant that the NET classes
> are only able to interact with the X server the first NET class is
> connected to.
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> Normally applications don't need to interact with multiple X servers.
> An exception is kwin_wayland which needs a connection to its Xwayland
> server and on the x11 backend to the X server it renders to. So far
> KWin could not use the NET classes for it, causing the rendering window
> to e.g. not have a window title.
> 
> This change removes the implicit constraint on one X server by
> creating a hash of connection and atoms. For each created NET class
> we check whether we have already resolved the atoms, if yes we reuse
> otherwise we create them.
> 
> For the normal use case of one X11 connection the change should be
> rather minimal. Instead of performing the check whether the static
> atoms have been created, it now is a check whether the atoms for the
> connection have been created. The atoms are kept in a
> QSharedDataPointer ensuring that we don't needless copy the atoms into
> each class.
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> CHANGELOG: Allow interacting with multiple X servers in the NETWM classes.
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> 
> Diffs
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>   src/platforms/xcb/atoms_p.h PRE-CREATION 
>   src/platforms/xcb/netwm.cpp d99a925 
>   src/platforms/xcb/netwm_p.h 917a86e 
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> Diff: https://git.reviewboard.kde.org/r/125309/diff/
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> Testing
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> 
> Thanks,
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> Thomas Lübking
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>

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