Summary:
KWindowSystem cannot be used in the Qt 4 style plugin. On the other hand,
we need to use KWindowSystem to make QWidget-based internal clients in
KWin cast drop-shadows.
Another problem with the Qt 4 style plugin is that some distributions
have already dropped Qt 4, so one has to build it first in order to
verify that his or her change works with Qt 4.
Given maintenance burden and the fact that Qt 6 is around the corner,
this change drops the Qt 4 style plugin.
Reviewers: #kwin, #plasma, davidedmundson
Reviewed By: #kwin, #plasma, davidedmundson
Subscribers: davidedmundson, mart, plasma-devel
Tags: #plasma
Maniphest Tasks: T12496
Differential Revision: https://phabricator.kde.org/D26476
Summary:
This allows devs to run: "make clang-format" and format all files easily
using the preset KDE clang format style
This patch adds support so devs can easily test the intended formatting
now, it doesn't change the code yet.
Doing an initial run to commit everything will happen later.
Test Plan:
Ran script
git diff was full of amazingly cleaned code
See D25134
Summary:
Creation of shadows (especially for "Large" and "Very large" sizes) is
a computation expensive task because we have to blur alpha channel of a
shadow texture (which then will be tinted with desired shadow color).
Currently, we use the following approach:
* for blur radius less than 64, use naive 2-pass algorithm;
* for blur radius greater than or equal to 64, use FFT.
Even though the FFT approach is doing its the best, it still takes
impresive amount of time to blur the alpha channel.
What makes things even worse is that while we're blurring the alpha
channel, we're blocking the main thread of KWin (decorations are not
rendered in their own thread). This can result in frame drops (2 or 3
frames, something like that).
So, the only viable alternative is to use an approximation of the Gaussian
blur. As such an approximation, I picked the box blur because it's quite
simple, it's fast, and it takes small amount of iterations to have something
similar to the true Gaussian blur.
In general, there are no big differences between true gaussian shadows
and approximated shadows:
Before:
{F6312610}
After:
{F6312613}
Before:
{F6280935}
After:
{F6312608}
As a win, it takes much less time to generate decoration shadows.
Reviewers: #kwin, #plasma, #breeze, #vdg, ngraham
Reviewed By: #breeze, #vdg, ngraham
Subscribers: cfeck, ngraham, abetts, plasma-devel
Tags: #plasma
Differential Revision: https://phabricator.kde.org/D15514
Summary:
Will make it possible to have breeze on the flatpak and snap backends
without all of the wallpapers
Subscribers: plasma-devel
Tags: #plasma
Differential Revision: https://phabricator.kde.org/D15807
Heiko Becker
Bhushan Shah
Laurent Montel
Jonathan Riddell
Vlad Zahorodnii
David Edmundson
Noah Davis
Aleix Pol