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// Copyright 2019 The Chromium Authors
// 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/raw_ptr.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_;
const raw_ptr<Delegate, ExperimentalAsh> 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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