1 files changed, 75 insertions, 0 deletions
diff --git a/dom/ipc/VsyncMainChild.cpp b/dom/ipc/VsyncMainChild.cpp
new file mode 100644
index 0000000000..483297ec71
--- /dev/null
+++ b/dom/ipc/VsyncMainChild.cpp
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "VsyncMainChild.h"
+
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/VsyncDispatcher.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla::dom {
+
+VsyncMainChild::VsyncMainChild()
+    : mIsShutdown(false), mVsyncRate(TimeDuration::Forever()) {
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+VsyncMainChild::~VsyncMainChild() { MOZ_ASSERT(NS_IsMainThread()); }
+
+void VsyncMainChild::AddChildRefreshTimer(VsyncObserver* aVsyncObserver) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mObservers.Contains(aVsyncObserver));
+
+  if (mIsShutdown) {
+    return;
+  }
+
+  if (mObservers.IsEmpty()) {
+    Unused << PVsyncChild::SendObserve();
+  }
+  mObservers.AppendElement(std::move(aVsyncObserver));
+}
+
+void VsyncMainChild::RemoveChildRefreshTimer(VsyncObserver* aVsyncObserver) {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mIsShutdown) {
+    return;
+  }
+
+  if (mObservers.RemoveElement(aVsyncObserver) && mObservers.IsEmpty()) {
+    Unused << PVsyncChild::SendUnobserve();
+  }
+}
+
+void VsyncMainChild::ActorDestroy(ActorDestroyReason aActorDestroyReason) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mIsShutdown);
+  mIsShutdown = true;
+
+  if (!mObservers.IsEmpty()) {
+    Unused << PVsyncChild::SendUnobserve();
+  }
+  mObservers.Clear();
+}
+
+mozilla::ipc::IPCResult VsyncMainChild::RecvNotify(const VsyncEvent& aVsync,
+                                                   const float& aVsyncRate) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mIsShutdown);
+
+  SchedulerGroup::MarkVsyncRan();
+
+  mVsyncRate = TimeDuration::FromMilliseconds(aVsyncRate);
+
+  for (RefPtr<VsyncObserver> observer : mObservers.ForwardRange()) {
+    observer->NotifyVsync(aVsync);
+  }
+  return IPC_OK();
+}
+
+TimeDuration VsyncMainChild::GetVsyncRate() { return mVsyncRate; }
+
+}  // namespace mozilla::dom