D26457: Introduce shadow API

[Vlad Zahorodnii]

zzag created this revision.
zzag added a reviewer: KWin.
Herald added a project: Frameworks.
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REVISION SUMMARY
  The new API provides a platform-independent way for setting drop-shadows
  on a window. X11 and Wayland details are completely hidden from the users
  of the new API, but you still need to be cautious about QPAs that destroy
  the underlying native resources(e.g. wl_surface) upon a window becoming
  hidden. It is highly recommended to install an event filter that reacts
  to events of type QEvent::PlatformSurface.

REPOSITORY
  R278 KWindowSystem

BRANCH
  kwindowshadow

REVISION DETAIL
  https://phabricator.kde.org/D26457

AFFECTED FILES
  src/CMakeLists.txt
  src/kwindowshadow.cpp
  src/kwindowshadow.h
  src/kwindowshadow_dummy_p.h
  src/kwindowshadow_p.h
  src/kwindowsystemplugininterface.cpp
  src/kwindowsystemplugininterface_p.h
  src/platforms/xcb/CMakeLists.txt
  src/platforms/xcb/kwindowshadow.cpp
  src/platforms/xcb/kwindowshadow_p_x11.h
  src/platforms/xcb/plugin.cpp
  src/platforms/xcb/plugin.h
  src/pluginwrapper.cpp
  src/pluginwrapper_p.h

To: zzag, #kwin
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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