All of kwin except the main function goes into a new (private) library
called kwin. Two new kdeinit_executables are created:
* kwin_x11
* kwin_wayland
Both only use a dedicated main_x11.cpp and main_wayland.cpp with the
main function and a KWin::Application subclass and linking the new
kwin library.
The main idea behind this is to be able to perform more sane sanity
checks. E.g. on Wayland we don't need to first test whether we can
create an X11 connection. Instead we should abort if we cannot connect
to the Wayland display. Also the multi-head checks are not needed on
Wayland, etc. etc. As most of that code is in the main function to
simplify it's better to split.
This will also make it easier to diverge more easily in future. The
Wayland variant can introduce more suited command line arguments for
example. This already started by having the --replace option only
available in X11 variant. The Wayland backend is still a window manager,
but doesn't claim the manager selection.
Required to stop and disconnect the timer. Otherwise it's possible
that the render is invoked after the Client got destroyed. This
happened for example with e.g. opening Kickoff.
Uses the QuickTileMode of the Client to indicate which borders to
remove. This could be extended to be in general when a window borders
the screen edge and not just for quick tile mode.
So far the DecorationRenderer got destroyed and recreated after
the signal compositing toggled was emitted. But that's too late for
e.g. the OpenGL Textures to be destroyed. So lets trigger the destroy
directly in setup/finish compositing. The new renderer will still be
created after the compositing toggled is emitted - we don't want to
have it recreated for the still active compositer type.
Surprisingly the DecorationShadow is modelled after the Shadow in KWin.
It provides the same offsets and a QImage exactly like the OpenGL
implementation needs it. This makes it easy to hook it into our existing
Shadow implementation with only a few changes.
Shadow now first tries to create a Shadow from the Decoration and only
if that fails it tries the X11 property. The pixmaps are not initialized
for the DecorationShadow and because of that currently only the OpenGL
backend gets initialized for DecorationShadows. The other backends might
need adjustments and also a transition to just using one image.
The Renderer gets reparented to the Deleted. While passing it to
the Deleted the Scene's implementation can ensure that the buffers
are up to date. After passing to Deleted it's no longer allowed to
call the render method.
NOTE: this is not working completely yet, lots of code is still ifdefed
other parts are still broken.
The main difference for the new decoration API is that it is neither
QWidget nor QWindow based. It's just a QObject which processes input
events and has a paint method to render the decoration. This means all
the workarounds for the QWidget interception are removed. Also the paint
redirector is removed. Instead each compositor has now its own renderer
which can be optimized for the specific case. E.g. the OpenGL compositor
renders to a scratch image which gets copied into the combined texture,
the XRender compositor copies into the XPixmaps.
Input events are also changed. The events are composed into QMouseEvents
and passed through the decoration, which might accept them. If they are
not accpted we assume that it's a press on the decoration area allowing
us to resize/move the window. Input events are not completely working
yet, e.g. wheel events are not yet processed and double click on deco
is not yet working.
Overall KDecoration2 is way more stateful and KWin core needs more
adjustments for it. E.g. borders are allowed to be disabled at any time.
