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/* -*- 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/RefPtr.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);
TimeDuration GetVsyncRate();
private:
VsyncChild();
virtual ~VsyncChild();
virtual bool RecvNotify(const TimeStamp& aVsyncTimestamp) override;
virtual bool RecvVsyncRate(const float& aVsyncRate) override;
virtual void ActorDestroy(ActorDestroyReason aActorDestroyReason) override;
bool mObservingVsync;
bool mIsShutdown;
// The content side vsync observer.
RefPtr<VsyncObserver> mObserver;
TimeDuration mVsyncRate;
};
} // namespace layout
} // namespace mozilla
#endif // mozilla_layout_ipc_VsyncChild_h
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