зеркало из https://github.com/mozilla/gecko-dev.git
99 строки
3.4 KiB
C++
99 строки
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 20; 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 _WaylandVsyncSource_h_
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#define _WaylandVsyncSource_h_
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#include "base/thread.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/Monitor.h"
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#include "mozilla/layers/NativeLayerWayland.h"
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#include "MozContainer.h"
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#include "nsWaylandDisplay.h"
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#include "VsyncSource.h"
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namespace mozilla {
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using layers::NativeLayerRootWayland;
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/*
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* WaylandVsyncSource
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*
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* This class provides a per-widget VsyncSource under Wayland, emulated using
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* frame callbacks on the widget surface with empty surface commits.
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*
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* Wayland does not expose vsync/vblank, as it considers that an implementation
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* detail the clients should not concern themselves with. Instead, frame
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* callbacks are provided whenever the compositor believes it is a good time to
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* start drawing the next frame for a particular surface, giving us as much
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* time as possible to do so.
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*
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* Note that the compositor sends frame callbacks only when it sees fit, and
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* when that may be is entirely up to the compositor. One cannot expect a
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* certain rate of callbacks, or any callbacks at all. Examples of common
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* variations would be surfaces moved between outputs with different refresh
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* rates, and surfaces that are hidden and therefore do not receieve any
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* callbacks at all. Other hypothetical scenarios of variation could be
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* throttling to conserve power, or because a user has requested it.
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*
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*/
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class WaylandVsyncSource final : public gfx::VsyncSource {
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public:
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explicit WaylandVsyncSource(nsWindow* aWindow);
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virtual ~WaylandVsyncSource();
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static Maybe<TimeDuration> GetFastestVsyncRate();
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void MaybeUpdateSource(MozContainer* aContainer);
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void MaybeUpdateSource(
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const RefPtr<NativeLayerRootWayland>& aNativeLayerRoot);
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void EnableMonitor();
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void DisableMonitor();
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void FrameCallback(wl_callback* aCallback, uint32_t aTime);
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void IdleCallback();
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TimeDuration GetVsyncRate() override;
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void EnableVsync() override;
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void DisableVsync() override;
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bool IsVsyncEnabled() override;
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void Shutdown() override;
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private:
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Maybe<TimeDuration> GetVsyncRateIfEnabled();
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void Refresh(const MutexAutoLock& aProofOfLock);
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void SetupFrameCallback(const MutexAutoLock& aProofOfLock);
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void CalculateVsyncRate(const MutexAutoLock& aProofOfLock,
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TimeStamp aVsyncTimestamp);
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void* GetWindowForLogging() { return mWindow; };
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Mutex mMutex;
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bool mIsShutdown MOZ_GUARDED_BY(mMutex) = false;
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bool mVsyncEnabled MOZ_GUARDED_BY(mMutex) = false;
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bool mMonitorEnabled MOZ_GUARDED_BY(mMutex) = false;
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bool mCallbackRequested MOZ_GUARDED_BY(mMutex) = false;
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MozContainer* mContainer MOZ_GUARDED_BY(mMutex) = nullptr;
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RefPtr<NativeLayerRootWayland> mNativeLayerRoot MOZ_GUARDED_BY(mMutex);
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TimeDuration mVsyncRate MOZ_GUARDED_BY(mMutex);
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TimeStamp mLastVsyncTimeStamp MOZ_GUARDED_BY(mMutex);
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guint mIdleTimerID MOZ_GUARDED_BY(mMutex) = 0;
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wl_callback* mCallback MOZ_GUARDED_BY(mMutex) = nullptr;
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nsWindow* const mWindow; // Main thread only, except for logging.
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const guint mIdleTimeout;
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};
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} // namespace mozilla
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#endif // _WaylandVsyncSource_h_
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