D15424: [effects/showpaint] Modernize code

zzag created this revision.
zzag added a reviewer: KWin.
Herald added a project: KWin.
Herald added a subscriber: kwin.
zzag requested review of this revision.

REVISION 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.

REPOSITORY
  R108 KWin

BRANCH
  effects-showpaint-modernize

REVISION DETAIL
  https://phabricator.kde.org/D15424

AFFECTED FILES
  effects/showpaint/showpaint.cpp
  effects/showpaint/showpaint.h

To: zzag, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart