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- // Copyright 2019 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef COMPONENTS_EXO_VSYNC_TIMING_MANAGER_H_
- #define COMPONENTS_EXO_VSYNC_TIMING_MANAGER_H_
- #include <vector>
- #include "ash/frame_throttler/frame_throttling_observer.h"
- #include "base/memory/weak_ptr.h"
- #include "base/time/time.h"
- #include "mojo/public/cpp/bindings/pending_remote.h"
- #include "mojo/public/cpp/bindings/receiver.h"
- #include "services/viz/privileged/mojom/compositing/vsync_parameter_observer.mojom.h"
- namespace exo {
- // Multiplexes vsync parameter updates from the display compositor to exo
- // clients using the zcr_vsync_feedback_v1 protocol. Will maintain an IPC
- // connection to the display compositor only when necessary.
- class VSyncTimingManager : public viz::mojom::VSyncParameterObserver,
- public ash::FrameThrottlingObserver {
- public:
- // Will be notified about changes in vsync parameters.
- class Observer {
- public:
- virtual ~Observer() = default;
- virtual void OnUpdateVSyncParameters(base::TimeTicks timebase,
- base::TimeDelta interval) = 0;
- };
- // Used to setup IPC connection to display compositor.
- class Delegate {
- public:
- virtual ~Delegate() = default;
- virtual void AddVSyncParameterObserver(
- mojo::PendingRemote<viz::mojom::VSyncParameterObserver> observer) = 0;
- };
- explicit VSyncTimingManager(Delegate* delegate);
- VSyncTimingManager(const VSyncTimingManager&) = delete;
- VSyncTimingManager& operator=(const VSyncTimingManager&) = delete;
- ~VSyncTimingManager() override;
- void AddObserver(Observer* obs);
- void RemoveObserver(Observer* obs);
- base::TimeDelta throttled_interval() const { return throttled_interval_; }
- private:
- // Overridden from viz::mojom::VSyncParameterObserver:
- void OnUpdateVSyncParameters(base::TimeTicks timebase,
- base::TimeDelta interval) override;
- // Overridden from ash::FrameThrottlingObserver
- void OnThrottlingStarted(const std::vector<aura::Window*>& windows,
- uint8_t fps) override;
- void OnThrottlingEnded() override;
- void InitializeConnection();
- void MaybeInitializeConnection();
- void OnConnectionError();
- base::TimeDelta throttled_interval_;
- base::TimeDelta last_interval_;
- base::TimeTicks last_timebase_;
- Delegate* const delegate_;
- std::vector<Observer*> observers_;
- mojo::Receiver<viz::mojom::VSyncParameterObserver> receiver_{this};
- base::WeakPtrFactory<VSyncTimingManager> weak_ptr_factory_{this};
- };
- } // namespace exo
- #endif // COMPONENTS_EXO_VSYNC_TIMING_MANAGER_H_
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