layout/ipc/VsyncChild.h
author Bobby Holley <bobbyholley@gmail.com>
Tue, 28 Jul 2015 17:52:52 -0700
changeset 255254 81beff07c6dc8176f2d78d443a716259fe6be924
parent 252629 91d6e262b662a0b4e47358665e222d3927337af9
child 266353 91d4539e00cecb658604e021675a923c60ef3235
permissions -rw-r--r--
Bug 1188696 - Hoist nsRefPtr.h into MFBT. r=froydnj

/* -*- 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/. */

#ifndef mozilla_layout_ipc_VsyncChild_h
#define mozilla_layout_ipc_VsyncChild_h

#include "mozilla/layout/PVsyncChild.h"
#include "nsISupportsImpl.h"
#include "mozilla/nsRefPtr.h"

namespace mozilla {

class VsyncObserver;

namespace ipc {
class BackgroundChildImpl;
} // namespace ipc

namespace layout {

// The PVsyncChild actor receives a vsync event from the main process and
// delivers it to the child process. Currently this is restricted to the main
// thread only. The actor will stay alive until the process dies or its
// PVsyncParent actor dies.
class VsyncChild final : public PVsyncChild
{
  NS_INLINE_DECL_REFCOUNTING(VsyncChild)

  friend class mozilla::ipc::BackgroundChildImpl;

public:
  // Hide the SendObserve/SendUnobserve in PVsyncChild. We add an flag
  // mObservingVsync to handle the race problem of unobserving vsync event.
  bool SendObserve();
  bool SendUnobserve();

  // Bind a VsyncObserver into VsyncChild after ipc channel connected.
  void SetVsyncObserver(VsyncObserver* aVsyncObserver);

private:
  VsyncChild();
  virtual ~VsyncChild();

  virtual bool RecvNotify(const TimeStamp& aVsyncTimestamp) override;
  virtual void ActorDestroy(ActorDestroyReason aActorDestroyReason) override;

  bool mObservingVsync;
  bool mIsShutdown;

  // The content side vsync observer.
  nsRefPtr<VsyncObserver> mObserver;
};

} // namespace layout
} // namespace mozilla

#endif  // mozilla_layout_ipc_VsyncChild_h