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// Copyright 2017 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 DEVICE_VR_UTIL_SLIDING_AVERAGE_H_
#define DEVICE_VR_UTIL_SLIDING_AVERAGE_H_
#include <vector>
#include "base/macros.h"
#include "base/time/time.h"
#include "device/vr/util/sample_queue.h"
#include "device/vr/vr_export.h"
namespace device {
class DEVICE_VR_EXPORT SlidingAverage {
public:
explicit SlidingAverage(size_t window_size);
~SlidingAverage();
void AddSample(int64_t value);
int64_t GetAverageOrDefault(int64_t default_value) const;
int64_t GetAverage() const { return GetAverageOrDefault(0); }
size_t GetCount() const { return values_.GetCount(); }
private:
SampleQueue values_;
DISALLOW_COPY_AND_ASSIGN(SlidingAverage);
};
class DEVICE_VR_EXPORT SlidingTimeDeltaAverage {
public:
explicit SlidingTimeDeltaAverage(size_t window_size);
virtual ~SlidingTimeDeltaAverage();
virtual void AddSample(base::TimeDelta value);
base::TimeDelta GetAverageOrDefault(base::TimeDelta default_value) const;
base::TimeDelta GetAverage() const {
return GetAverageOrDefault(base::TimeDelta());
}
size_t GetCount() const { return sample_microseconds_.GetCount(); }
private:
SlidingAverage sample_microseconds_;
DISALLOW_COPY_AND_ASSIGN(SlidingTimeDeltaAverage);
};
} // namespace device
#endif // DEVICE_VR_UTIL_SLIDING_AVERAGE_H_
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