зеркало из https://github.com/mozilla/gecko-dev.git
71 строка
2.2 KiB
C++
71 строка
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_layout_ipc_VsyncChild_h
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#define mozilla_layout_ipc_VsyncChild_h
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#include "mozilla/layout/PVsyncChild.h"
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#include "nsISupportsImpl.h"
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#include "mozilla/RefPtr.h"
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namespace mozilla {
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class VsyncObserver;
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namespace ipc {
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class BackgroundChildImpl;
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} // namespace ipc
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namespace layout {
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// The PVsyncChild actor receives a vsync event from the main process and
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// delivers it to the child process. Currently this is restricted to the main
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// thread only. The actor will stay alive until the process dies or its
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// PVsyncParent actor dies.
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class VsyncChild final : public PVsyncChild
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{
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NS_INLINE_DECL_REFCOUNTING(VsyncChild)
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friend class mozilla::ipc::BackgroundChildImpl;
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public:
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// Hide the SendObserve/SendUnobserve in PVsyncChild. We add an flag
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// mObservingVsync to handle the race problem of unobserving vsync event.
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bool SendObserve();
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bool SendUnobserve();
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// Bind a VsyncObserver into VsyncChild after ipc channel connected.
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void SetVsyncObserver(VsyncObserver* aVsyncObserver);
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// GetVsyncRate is a getter for mVsyncRate which sends a requests to
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// VsyncParent to retreive the hardware vsync rate if mVsyncRate
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// hasn't already been set.
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TimeDuration GetVsyncRate();
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// VsyncRate is a getter for mVsyncRate which always returns
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// mVsyncRate directly, potentially returning
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// TimeDuration::Forever() if mVsyncRate hasn't been set by calling
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// GetVsyncRate.
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TimeDuration VsyncRate();
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private:
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VsyncChild();
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virtual ~VsyncChild();
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virtual mozilla::ipc::IPCResult RecvNotify(const TimeStamp& aVsyncTimestamp) override;
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virtual mozilla::ipc::IPCResult RecvVsyncRate(const float& aVsyncRate) override;
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virtual void ActorDestroy(ActorDestroyReason aActorDestroyReason) override;
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bool mObservingVsync;
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bool mIsShutdown;
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// The content side vsync observer.
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RefPtr<VsyncObserver> mObserver;
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TimeDuration mVsyncRate;
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};
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} // namespace layout
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} // namespace mozilla
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#endif // mozilla_layout_ipc_VsyncChild_h
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