This is a fork of ShapeCorners KWin effect that additionally implements an outline around the window.

warning

• This effect is not compatible with KDE Plasma 5.23 and onwards.

• This effect may cause a heavy performance impact
• This effect can be affected by this KWin bug: https://bugs.kde.org/show_bug.cgi?id=395725
• Aurorae decoration themes are not compatible

• The decoration border/shadow and the effect must have the same corner radius

  Dependencies:

From: https://github.com/alex47/KDE-Rounded-Corners

Debian based (Ubuntu, Kubuntu, KDE Neon):

sudo apt install git cmake g++ gettext extra-cmake-modules qttools5-dev libqt5x11extras5-dev libkf5configwidgets-dev libkf5crash-dev libkf5globalaccel-dev libkf5kio-dev libkf5notifications-dev kinit-dev kwin-dev 

Fedora based

sudo dnf install git cmake gcc-c++ extra-cmake-modules qt5-qttools-devel qt5-qttools-static qt5-qtx11extras-devel kf5-kconfigwidgets-devel kf5-kcrash-devel kf5-kguiaddons-devel kf5-kglobalaccel-devel kf5-kio-devel kf5-ki18n-devel kf5-knotifications-devel kf5-kinit-devel kwin-devel qt5-qtbase-devel libepoxy-devel

Manual instalation

git clone https://github.com/Luwx/LightlyShaders

cd LightlyShaders; mkdir qt5build; cd qt5build; cmake ../ -DCMAKE_INSTALL_PREFIX=/usr -DQT5BUILD=ON && make && sudo make install && (kwin_x11 --replace &)