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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_layers_AndroidVelocityTracker_h
#define mozilla_layers_AndroidVelocityTracker_h
#include <utility>
#include <cstdint>
#include "Axis.h"
#include "mozilla/Attributes.h"
#include "mozilla/Maybe.h"
#include "nsTArray.h"
namespace mozilla {
namespace layers {
class AndroidVelocityTracker : public VelocityTracker {
public:
explicit AndroidVelocityTracker();
void StartTracking(ParentLayerCoord aPos, TimeStamp aTimestamp) override;
Maybe<float> AddPosition(ParentLayerCoord aPos,
TimeStamp aTimestamp) override;
Maybe<float> ComputeVelocity(TimeStamp aTimestamp) override;
void Clear() override;
private:
// A queue of (timestamp, position) pairs; these are the historical
// positions at the given timestamps.
nsTArray<std::pair<TimeStamp, ParentLayerCoord>> mHistory;
// The last time an event was added to the tracker, or the null moment if no
// events have been added.
TimeStamp mLastEventTime;
};
} // namespace layers
} // namespace mozilla
#endif
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