D19544: Send blur/background contrast in device pixels

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: KWin.
Herald added a project: Frameworks.
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davidedmundson requested review of this revision.

REVISION SUMMARY
  A Qt app using Qt scaling will only know the position of windows and all
  geometry in logical pixels. Kwin needs everything in device pixels.
  
  This hasn't been a big issue till now as plasma on X doesn't opt in for
  Qt scaling. For wayland everything is in the same sane coordinate space.
  
  It can occur in some previews in systemsettings and at some point maybe plasma should use
  Qt scaling on X
  
  BUG: 404923

TEST PLAN
  Task switcher now blurred the whole area.
  Ran plamsa on X with plasma_use_qt_scaling. Kickoff was less corrupted.

REPOSITORY
  R278 KWindowSystem

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19544

AFFECTED FILES
  src/kwindoweffects.h
  src/platforms/xcb/kwindoweffects.cpp

To: davidedmundson, #kwin
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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