As KWin measures render times properly now, these settings and estimations
should no longer be necessary, so this commit replaces them with one hardcoded
algorithm that should prevent most dropped frames and reduce latency
Amends 4d2c9f5d88.
Prior to 4d2c9f5d88, the Compositor used
to force the Options to reload settings when starting compositing.
Unfortunately it was overlooked that Options::animationTimeFactor() can
return an old value when the Options::animationSpeedChanged() signal is
emitted. This change addresses that.
Config loading is split in two groups: loading compositing config and
loading the rest. They are loaded separately at different times. Some
options are loaded in the Options constructor, some are loaded when compositing
starts, some are loaded when the Workspace is created. It's not easy to
keep track of what loads what and when.
This change simplifies option handling by loading all options in bulk
and decouples Options from OutputBackend and GLPlatform to ensure that
it can safely load options before kwin is fully operational.
* speeds up incremental builds as changes to a header will not always
need the full mocs_compilation.cpp for all the target's headers rebuild,
while having a moc file sourced into a source file only adds minor
extra costs, due to small own code and the used headers usually
already covered by the source file, being for the same class/struct
* seems to not slow down clean builds, due to empty mocs_compilation.cpp
resulting in those quickly processed, while the minor extra cost of the
sourced moc files does not outweigh that in summary.
Measured times actually improved by some percent points.
(ideally CMake would just skip empty mocs_compilation.cpp & its object
file one day)
* enables compiler to see all methods of a class in same compilation unit
to do some sanity checks
* potentially more inlining in general, due to more in the compilation unit
* allows to keep using more forward declarations in the header, as with the
moc code being sourced into the cpp file there definitions can be ensured
and often are already for the needs of the normal class methods
It's somewhat popular for voice communication applications to support
Push-to-Talk. This means that the process itself expects to get all of
the system input. This behaviour albeit sound does not work on Wayland
systems.
This commit adds an option to let legacy X11 applications that assume
they will be getting all information to do so until these apps are
properly ported to the XDP GlobalShortcuts.
Things such as Output, InputDevice and so on are made to be
multi-purpose. In order to make this separation more clear, this change
moves that code in the core directory. Some things still link to the
abstraction level above (kwin), they can be tackled in future refactors.
Ideally code in core/ should depend either on other code in core/ or
system libs.
Other policy enums are declared in options.h so let's do the same for
placement policy. Besides consistency, another advantage of moving the
enum in kwin namespace is that the enum could be forward declared.
When a window that is on a different virtual desktop than the current one gets
activated, the current behavior is that the active virtual desktop will be switched
to the one the activated window is on. This may seem reasonable for a scenario where
the user explicitly intends to activate an existing window on a different desktop.
However, the following scenario is also (perhaps even more?) common: When an
application responds to a launch command by requesting to activate an existing
instance instead of opening a new one (such as Firefox or KDE System Settings), an
existing window on any desktop will get activated even when what the user had in
mind was opening a new window (on the desktop they are currently in).
This means that opening an application, such as following a URL or accessing a
system setting, unexpectedly results in the user being teleported to a different
virtual desktop. This can be very irritating. The more expected behavior for these
users would be to have windows always open on the desktop where they are called
from. That's is what this commit adds as a new option.
BUG: 438375
FIXED-IN: 5.26
The .clang-format file is based on the one in ECM except the following
style options:
- AlwaysBreakBeforeMultilineStrings
- BinPackArguments
- BinPackParameters
- ColumnLimit
- BreakBeforeBraces
- KeepEmptyLinesAtTheStartOfBlocks
This ensures that we get a warning if the config header is not included
instead of compiling the code as if it was disabled. Interestingly, some
checks already used #if KWIN_BUILD_*, so those were generating -Wundef
warnings when the feature is disabled. Commit 886173cab assumed that all
those features were already 01, so this unbreaks the build if any of the
features is disabled.
Fixes: 886173cab ("Reduce ifdefs in Workspace::supportInformation()")
It's not practical, regular users don't care about window geometry. One
could argue that it can be useful for creating window rules, but window
rules kcm pulls relevant properties from kwin.
If needed, one can reimplement this feature as a QtQuick script that creates
an overlay window positioned above the window that is being interactively
moved or resized.
This change merges the two OpenGL backends into one making the current
default of GLCore the overall default. It becomes the first context to
try to create. If it fails, it will automatically fall back to the
(previous) OpenGL 2 backend.
Reasoning: the differentiation of OpenGL 2 and 3 is a very technical one
and hard to understand for users. It is not obvious which one is better
or should be used. This results in many user discussions like "Which
backend to use?"
Back when the OpenGL 3 backend was introduced the dedicated feature made
sense. It was a new code base using new driver features. Nowadays the
code base in KWin is robust and mature and so are the drivers. A driver
advertising support for OpenGL 3 will support OpenGL 3. We don't have to
plan for driver breakage in this area any more.
Also our code evolved through the context attribute builder which gives
us the possibility to more easily fall back in case we cannot create the
context. Thus the need to select the backend is not so important as it
used to be when the feature got introduced.
If a user still wants to force OpenGL2, it is still possible by setting
the appropriate environment variables like MESA_GL_VERSION_OVERRIDE.
This change brings the improvement that the backend selection is now
completely removed from the compositing KCM.
Active output is a window management concept. It indicates what output
new windows have to be placed on if they have no output hint. So
Workspace seems to be a better place for it than the Screens class, which
is obsolete.
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.
With the new compositing scheduling, we want the screen to be redrawn as
close as possible to the next vblank. Furthermore, compositing is no
longer driven by a timer. This change removes the NoSwapEncourage swap
strategy as it doesn't make sense now, in addition to that it just does
not work on Wayland.
Currently, we estimate the expected render time purely based on the
latency policy.
The problem with doing so is that the real render time might be larger,
this can result in frame drops.
In order to avoid frame drops, we need to take into account previous
render times while estimating the next render time. For now, we just
measure how long it takes to record rendering commands on the CPU.
In the future, we might want consider using OpenGL timer queries for
measuring the real render time, but for now, it's good enough.
At the moment, our frame scheduling infrastructure is still heavily
based on Xinerama-style rendering. Specifically, we assume that painting
is driven by a single timer, etc.
This change introduces a new type - RenderLoop. Its main purpose is to
drive compositing on a specific output, or in case of X11, on the
overlay window.
With RenderLoop, compositing is synchronized to vblank events. It
exposes the last and the next estimated presentation timestamp. The
expected presentation timestamp can be used by effects to ensure that
animations are synchronized with the upcoming vblank event.
On Wayland, every outputs has its own render loop. On X11, per screen
rendering is not possible, therefore the platform exposes the render
loop for the overlay window. Ideally, the Scene has to expose the
RenderLoop, but as the first step towards better compositing scheduling
it's good as is for the time being.
The RenderLoop tries to minimize the latency by delaying compositing as
close as possible to the next vblank event. One tricky thing about it is
that if compositing is too close to the next vblank event, animations
may become a little bit choppy. However, increasing the latency reduces
the choppiness.
Given that, there is no any "silver bullet" solution for the choppiness
issue, a new option has been added in the Compositing KCM to specify the
amount of latency. By default, it's "Medium," but if a user is not
satisfied with the upstream default, they can tweak it.
Since some people apparently liked the old behavior of moving minimized
windows to the end of the focus chain, let's let them have it if they
set a hidden config option:
`MoveMinimizedWindowsToEndOfTabBoxFocusChain=true` in the `[TabBox]` group
of the kwinrc file.
We can add a UI for it later if needed.
BUG: 427840
FIXED-IN: 5.21
If the Xwayland process has crashed due to some bug, the user should
still be able to start applications in Xwayland mode. There is no reason
to restart the whole session just to be able to launch some application
that doesn't have native support for Wayland.
The main advantage of SPDX license identifiers over the traditional
license headers is that it's more difficult to overlook inappropriate
licenses for kwin, for example GPL 3. We also don't have to copy a
lot of boilerplate text.
In order to create this change, I ran licensedigger -r -c from the
toplevel source directory.
Summary: Alt + Left Click to move windows has a tendency to conflict with creative workflow apps. While Alt can be changed to Meta in KWin's settings, Alt + Left Click shortcuts often cannot be customized in apps. Rather than making every user who runs into this problem change their settings, we should change our default settings to improve KWin's default usability. The fact that Alt + Left Click to move windows is older does not matter. We are trying to use Meta for global/shell shortcuts anyway.
BUG: 399375
Test Plan: The relevant parts of the relevant tests pass. kwin-testInternalWindow fails, but for unrelated reasons that have something to do with XWayland.
Summary:
e.g. "Vertically maximize" is more natural and expressive than "Maximize (vertical only)"
See D29671#inline-169882.
Test Plan: New strings appear in the KCM
Reviewers: zzag, #vdg, #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D29729
Summary:
Selecting not to vsync does not make sense for an X11 compositor. In the end
we want clients to be able to present async if they want to but the compositor
is supposed to send swaps with vsync to the XServer in order to not generate
tearing artifacts.
There was also a detection logic which did some questionable things in case
vsync was not available. I don't think this is necessary at all since we can
just always run a timer to present with or without vsync.
Test Plan: kwin_x11 tested on i915.
Reviewers: #kwin, zzag
Subscribers: zzag, kwin
Tags: #kwin
Maniphest Tasks: T11071
Differential Revision: https://phabricator.kde.org/D23511
Summary:
It doesn't belong with advanced compositing settings as it's quite user
friendly, and we also want to adjust other animation speeds. May as well
do it together.
In the current form all compositing is still completely reinitiliased
like with the previous slider. Change notifications come in the form of
KConfigWatcher rather than our own bespoke update interface.
Test Plan:
Moved new slider, minimised a window.
It still behaved as expected.
Reviewers: #kwin, zzag
Reviewed By: #kwin, zzag
Subscribers: zzag, broulik, anthonyfieroni, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D22887
Summary:
This has been commented out since 2014, I doubt it will come back.
This is a big amount of code, maintenance will be easier without it.
Reviewers: #kwin, zzag
Reviewed By: #kwin, zzag
Subscribers: romangg, graesslin, kwin
Tags: #kwin, #documentation
Differential Revision: https://phabricator.kde.org/D23069
Vlad Zahorodnii
Xaver Hugl
Laurent Montel
Aleix Pol Gonzalez
Andreas Cord-Landwehr
Aleix Pol
Natalie Clarius
Kai Uwe Broulik
Volker Krause
Alex Richardson
Martin Flöser
Nate Graham
Noah Davis
Roman Gilg
Yuri Chornoivan
David Edmundson
Frederik Gladhorn
Vlad Zagorodniy