The main motivation behind this change is to encapsulate X11 compositor
implementation to the point that it can be moved from libkwin to
kwin_x11.
There are two options: either get rid of suspend and resume requests, or
add suspend and resume virtual functions in the Compositor. The apps
must definitely not rely on the dbus api, they must use the X11 api.
Compositing suspension api works only on X11 and it's quite obscure,
it's not used by any other KDE component.
So this patch goes for the most simplest option: dropping the requests.
This allows us to unify the X and Wayland codepaths that currently go
through window-system specific IPC. It also allows us to easily track
who called "setShowingDesktop" and cancel the effect when that client
disappears.
CCBUG: 449445
The .clang-format file is based on the one in ECM except the following
style options:
- AlwaysBreakBeforeMultilineStrings
- BinPackArguments
- BinPackParameters
- ColumnLimit
- BreakBeforeBraces
- KeepEmptyLinesAtTheStartOfBlocks
Without spacing it is not immediately evident where a doc comment
ends and a new declaration begins. Adding a line of whitespace
makes everything more readable and easier to scan quickly.
The Xrender backend was added at the time when OpenGL drivers were not
particularly stable. Nowadays though, it's a totally different situation.
The OpenGL render backend has been the default one for many years. It's
quite stable, and it allows implementing many advanced features that
other render backends don't.
Many features are not tested with it during the development cycle; the
only time when it is noticed is when changes in other parts of kwin break
the build in the xrender backend. Effectively, the xrender backend is
unmaintained nowadays.
Given that the xrender backend is effectively unmaintained and our focus
being shifted towards wayland, this change drops the xrender backend in
favor of the opengl backend.
Besides being de-facto unmaintained, another issue is that QtQuick does
not support and most likely will never support the Xrender API. This
poses a problem as we want thumbnail items to be natively integrated in
the qtquick scene graph.
Once in a while, we receive complaints from other fellow KDE developers
about the file organization of kwin. This change addresses some of those
complaints by moving all of source code in a separate directory, src/,
thus making the project structure more traditional. Things such as tests
are kept in their own toplevel directories.
This change may wreak havoc on merge requests that add new files to kwin,
but if a patch modifies an already existing file, git should be smart
enough to figure out that the file has been relocated.
We may potentially split the src/ directory further to make navigating
the source code easier, but hopefully this is good enough already.
