1 files changed, 54 insertions, 0 deletions
diff --git a/dom/ipc/VsyncParent.h b/dom/ipc/VsyncParent.h
new file mode 100644
index 0000000000..3fe8a8e5f2
--- /dev/null
+++ b/dom/ipc/VsyncParent.h
@@ -0,0 +1,54 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_ipc_VsyncParent_h
+#define mozilla_dom_ipc_VsyncParent_h
+
+#include "mozilla/dom/PVsyncParent.h"
+#include "mozilla/VsyncDispatcher.h"
+#include "nsCOMPtr.h"
+#include "mozilla/RefPtr.h"
+
+class nsIThread;
+
+namespace mozilla::dom {
+
+// Use PBackground thread in the main process to send vsync notifications to
+// content process. This actor will be released when its parent protocol calls
+// DeallocPVsyncParent().
+class VsyncParent final : public PVsyncParent, public VsyncObserver {
+  friend class PVsyncParent;
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VsyncParent, override)
+
+ public:
+  VsyncParent();
+  void UpdateVsyncDispatcher(const RefPtr<VsyncDispatcher>& aVsyncDispatcher);
+
+ private:
+  virtual ~VsyncParent() = default;
+
+  void NotifyVsync(const VsyncEvent& aVsync) override;
+  virtual void ActorDestroy(ActorDestroyReason aActorDestroyReason) override;
+
+  mozilla::ipc::IPCResult RecvObserve();
+  mozilla::ipc::IPCResult RecvUnobserve();
+
+  void DispatchVsyncEvent(const VsyncEvent& aVsync);
+  void UpdateVsyncRate();
+
+  bool IsOnInitialThread();
+  void AssertIsOnInitialThread();
+
+  bool mObservingVsync;
+  bool mDestroyed;
+  nsCOMPtr<nsIThread> mInitialThread;
+  RefPtr<VsyncDispatcher> mVsyncDispatcher;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_ipc_VsyncParent_h