D18656: [wayland] Send correct current time in the frame callback

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
  Currently, each frame callback sent by KWin has the current time in
  nanoseconds, but the protocol spec states that we have to send the time
  in milliseconds.
  
  Also, it's worth to mention that m_timeSinceStart isn't actually "time
  since start," it's rather accumulated duration of all painting cycles.
  If there is something to draw and it takes quite a while to compose the
  scene, maybe m_timeSinceStart will be close enough to the current time.

TEST PLAN
  The triangle in weston-subsurfaces no longer spins very fast.

REPOSITORY
  R108 KWin

BRANCH
  send-correct-time-in-frame-callback

REVISION DETAIL
  https://phabricator.kde.org/D18656

AFFECTED FILES
  composite.cpp
  composite.h

To: zzag, #kwin
Cc: kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart