Effects are given the interval between two consecutive frames. The main
flaw of this approach is that if the Compositor transitions from the idle
state to "active" state, i.e. when there is something to repaint,
effects may see a very large interval between the last painted frame and
the current. In order to address this issue, the Scene invalidates the
timer that is used to measure time between consecutive frames before the
Compositor is about to become idle.
While this works perfectly fine with Xinerama-style rendering, with per
screen rendering, determining whether the compositor is about to idle is
rather a tedious task mostly because a single output can't be used for
the test.
Furthermore, since the Compositor schedules pointless repaints just to
ensure that it's idle, it might take several attempts to figure out
whether the scene timer must be invalidated if you use (true) per screen
rendering.
Ideally, all effects should use a timeline helper that is aware of the
underlying render loop and its timings. However, this option is off the
table because it will involve a lot of work to implement it.
Alternative and much simpler option is to pass the expected presentation
time to effects rather than time between consecutive frames. This means
that effects are responsible for determining how much animation timelines
have to be advanced. Typically, an effect would have to store the
presentation timestamp provided in either prePaint{Screen,Window} and
use it in the subsequent prePaint{Screen,Window} call to estimate the
amount of time passed between the next and the last frames.
Unfortunately, this is an API incompatible change. However, it shouldn't
take a lot of work to port third-party binary effects, which don't use the
AnimationEffect class, to the new API. On the bright side, we no longer
need to be concerned about the Compositor getting idle.
We do still try to determine whether the Compositor is about to idle,
primarily, because the OpenGL render backend swaps buffers on present,
but that will change with the ongoing compositing timing rework.
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:
We build some objects several times which makes it uncomfortable to develop KWin
since every time we modify something a lot of things get rebuilt. This should
help a bit although it doesn't solve all the problems.
Test Plan: Builds, tests pass
Reviewers: #kwin, zzag
Reviewed By: #kwin, zzag
Subscribers: davidedmundson, zzag, anthonyfieroni, iasensio, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D28445
Summary:
Won't make things go much faster since everything that was
being passed by value is refcounted but still const & is a bit faster
than refcounting
For shared pointers instead of adding const & we move them into the
destination variable saving some cpu usage but at the same time making
clear the pointer is being stored by not being const &
Reviewers: zzag
Reviewed By: zzag
Subscribers: zzag, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D25022
We have lots of inconsistency at the moment in CMakeLists.txt files. Most
of it is due to kwin being a very old project. This change hopefully fixes
all of it.
Summary:
So far we were following a bit unique and rare doxygen comment style:
/**
* Contents of the comment.
**/
Doxygen comments with this style look balanced and neat, but many people
that contribute to KWin don't follow this style. Instead, they prefer
more traditional doxygen comment style, i.e.
/**
* Contents of the comment.
*/
Reviewing such changes has been a bit frustrating for me (so selfish!)
and for other contributors.
This change switches doxygen comment style in KWin to a more traditional
style. The main reason for doing this is to make code review process easier
for new contributors as well us.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D22812
Summary:
Currently code base of kwin can be viewed as two pieces. One is very
ancient, and the other one is more modern, which uses new C++ features.
The main problem with the ancient code is that it was written before
C++11 era. So, no override or final keywords, lambdas, etc.
Quite recently, KDE compiler settings were changed to show a warning if
a virtual method has missing override keyword. As you might have already
guessed, this fired back at us because of that ancient code. We had
about 500 new compiler warnings.
A "solution" was proposed to that problem - disable -Wno-suggest-override
and the other similar warning for clang. It's hard to call a solution
because those warnings are disabled not only for the old code, but also
for new. This is not what we want!
The main argument for not actually fixing the problem was that git
history will be screwed as well because of human factor. While good git
history is a very important thing, we should not go crazy about it and
block every change that somehow alters git history. git blame allows to
specify starting revision for a reason.
The other argument (human factor) can be easily solved by using tools
such as clang-tidy. clang-tidy is a clang-based linter for C++. It can
be used for various things, e.g. fixing coding style(e.g. add missing
braces to if statements, readability-braces-around-statements check),
or in our case add missing override keywords.
Test Plan: Compiles.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: davidedmundson, apol, romangg, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D22371
Summary:
We have a mix of different doxygen comment styles, e.g.
/*!
Foo bar.
*/
/**
* Foo bar.
*/
/** Foo bar.
*/
/**
* Foo bar.
*/
/**
* Foo bar.
**/
To make the code more consistent, this change updates the style of all
doxygen comments to the last one.
Test Plan: Compiles.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D18683
Summary:
The "Force" part in WindowForceBackgroundContrastRole and WindowForceBlurRole
is confusing. If WindowForceBlurRole is set on a window, background
behind it won't be blurred.
By setting WindowForceBlurRole we tell the Blur effect "that's fine to
do your business behind transformed windows."
The Slide effect only translates windows, it doesn't distort them, etc.
So, we can set WindowForceBackgroundContrastRole and WindowForceBlurRole
for all windows.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: davidedmundson, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D15707
Summary:
If isActive() returns false, neither paintScreen nor paintWindow nor
postPaintScreen will be called.
So, `if (m_active)` checks are redundant.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D15708
Summary:
Kdelibs coding style states the following about whitespace placement:
> For pointers or references, use a single space before '*' or '&', but not after
Source: https://community.kde.org/Policies/Kdelibs_Coding_Style#Whitespace
Also, putting a whitespace after ! is not common in KWin.
Test Plan: Switched between virtual desktops.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: davidedmundson, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D14260
Summary: That's mostly to analyze what options people use in bug reports.
Test Plan:
* Enabled the Slide effect
* Ran `qdbus org.kde.KWin /KWin supportInformation`
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: davidedmundson, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D13843
Summary:
D9638 made docks to slide to "fix" the problem when switching to a
virtual desktop that has a window in full screen mode:
{F5615542}
As it turns out, people don't like this kind of behaviour. Another
problem with sliding of docks is that pager goes away.
This change disables sliding of docks by default. One can enable sliding
of docks by checking "Slide docks" checkbox in slide effect KCM.
Yet, transition to/from virtual desktop with a window in full screen
mode doesn't look great but that's somewhat acceptable:
{F5915681}
//(we don't see issues that are present in the video above because the new slide effect elevates docks if sliding of docks is disabled)//
Test Plan: Switched between virtual desktops, the default panel didn't slide.
Reviewers: #kwin, #plasma, #vdg, ngraham, graesslin
Reviewed By: #kwin, #plasma, #vdg, ngraham, graesslin
Subscribers: ngraham, graesslin, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D13566
Summary:
Some people may not like the sliding of desktop background. Add
corresponding option to disable the sliding of desktop background.
By disabling the sliding of desktop background and docks, one can
get old slide effect.
{F5912713, layout=center, size=full}
Test Plan:
* Unchecked "Slide desktop background" checkbox, switched desktop;
* Checked "Slide desktop background" checkbox, switched desktop.
Reviewers: #kwin, #plasma, #vdg, mart
Reviewed By: #kwin, #plasma, #vdg, mart
Subscribers: romangg, abetts, ngraham, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D13542
Summary:
HBoxLayout was a bad choice for label-spinbox pairs. Use appropriate
layout(FormLayout) for such things.
Test Plan: The KCM still looks the same.
Reviewers: #kwin, mart
Reviewed By: #kwin, mart
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D13422
Summary: It improves a little bit readability and comprehensibility of the code.
Reviewers: #kwin, mart
Reviewed By: #kwin, mart
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D13116
Summary:
The new slide effect tries to separate each virtual desktop
as much as possible. This separation makes the new slide
effect more intuitive than the old one.
Test Plan:
* switch between virtual desktops
* or, move a window to another virtual desktop
Reviewers: #vdg, #kwin, #plasma, graesslin, ngraham
Reviewed By: #kwin, #plasma, graesslin
Subscribers: mart, graesslin, abetts, ngraham, plasma-devel, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D9638
