import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/ipc/VsyncChild.cpp

@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VsyncChild.h"
+
+#include "mozilla/VsyncDispatcher.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+namespace layout {
+
+VsyncChild::VsyncChild()
+  : mObservingVsync(false)
+  , mIsShutdown(false)
+  , mVsyncRate(TimeDuration::Forever())
+{
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+VsyncChild::~VsyncChild()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+bool
+VsyncChild::SendObserve()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!mObservingVsync && !mIsShutdown) {
+    mObservingVsync = true;
+    PVsyncChild::SendObserve();
+  }
+  return true;
+}
+
+bool
+VsyncChild::SendUnobserve()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mObservingVsync && !mIsShutdown) {
+    mObservingVsync = false;
+    PVsyncChild::SendUnobserve();
+  }
+  return true;
+}
+
+void
+VsyncChild::ActorDestroy(ActorDestroyReason aActorDestroyReason)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mIsShutdown);
+  mIsShutdown = true;
+  mObserver = nullptr;
+}
+
+bool
+VsyncChild::RecvNotify(const TimeStamp& aVsyncTimestamp)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mIsShutdown);
+  if (mObservingVsync && mObserver) {
+    mObserver->NotifyVsync(aVsyncTimestamp);
+  }
+  return true;
+}
+
+void
+VsyncChild::SetVsyncObserver(VsyncObserver* aVsyncObserver)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  mObserver = aVsyncObserver;
+}
+
+TimeDuration
+VsyncChild::GetVsyncRate()
+{
+  if (mVsyncRate == TimeDuration::Forever()) {
+    PVsyncChild::SendRequestVsyncRate();
+  }
+
+  return mVsyncRate;
+}
+
+bool
+VsyncChild::RecvVsyncRate(const float& aVsyncRate)
+{
+  mVsyncRate = TimeDuration::FromMilliseconds(aVsyncRate);
+  return true;
+}
+
+} // namespace layout
+} // namespace mozilla