D16630: [drm] Support transformation on CRTC in addition to primary plane

graesslin created this revision.
graesslin added a reviewer: KWin.
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REVISION SUMMARY
  So far we tried to rotate on the primary plane, but the feedback has
  been that it doesn't work for 90 and 270 degrees. As crtc also supports
  rotation this change refactors the functionality to provide rotation on
  the crtc if the primary plane doesn't support it.
  
  Unfortunately on my system this doesn't help: all crtcs report no
  supported transformations. So either I did a mistake in the
  initialization or someone else needs to test this patch.

REPOSITORY
  R108 KWin

BRANCH
  transformation-on-crtc

REVISION DETAIL
  https://phabricator.kde.org/D16630

AFFECTED FILES
  plugins/platforms/drm/drm_object.cpp
  plugins/platforms/drm/drm_object.h
  plugins/platforms/drm/drm_object_crtc.cpp
  plugins/platforms/drm/drm_object_crtc.h
  plugins/platforms/drm/drm_object_plane.cpp
  plugins/platforms/drm/drm_object_plane.h
  plugins/platforms/drm/drm_output.cpp
  plugins/platforms/drm/drm_output.h

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