Summary:
Summary of changes:
* Use QVector to store colors
* Add Q_OBJECT macro
* Port away from QRegion::rects
* Fix coding style
* Use default member initialization
* Use nullptr
* Reserve rects in paintXrender
The behavior of this effect haven't been changed, it still acts as before.
Test Plan: Compiles, and the Show Paint effect is still a psychedelic thing.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D15424
cc1f30b43d