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/*
* Copyright (C) 2012-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "FloatPoint.h"
#include <wtf/MonotonicTime.h>
#include <wtf/TZoneMalloc.h>
namespace WTF {
class TextStream;
}
namespace WebCore {
struct VelocityData {
float horizontalVelocity { 0 };
float verticalVelocity { 0 };
float scaleChangeRate { 0 };
MonotonicTime lastUpdateTime;
VelocityData(float horizontal = 0, float vertical = 0, float scaleChange = 0, MonotonicTime updateTime = MonotonicTime())
: horizontalVelocity(horizontal)
, verticalVelocity(vertical)
, scaleChangeRate(scaleChange)
, lastUpdateTime(updateTime)
{
}
bool velocityOrScaleIsChanging() const
{
return horizontalVelocity || verticalVelocity || scaleChangeRate;
}
bool equalIgnoringTimestamp(const VelocityData& other) const
{
return horizontalVelocity == other.horizontalVelocity
&& verticalVelocity == other.verticalVelocity
&& scaleChangeRate == other.scaleChangeRate;
}
};
WEBCORE_EXPORT TextStream& operator<<(TextStream&, const VelocityData&);
class HistoricalVelocityData {
WTF_MAKE_TZONE_ALLOCATED(HistoricalVelocityData);
public:
HistoricalVelocityData() = default;
WEBCORE_EXPORT VelocityData velocityForNewData(FloatPoint newPosition, double scale, MonotonicTime);
void clear() { m_historySize = 0; }
private:
static constexpr unsigned maxHistoryDepth = 3;
unsigned m_historySize { 0 };
unsigned m_latestDataIndex { 0 };
MonotonicTime m_lastAppendTimestamp;
struct Data {
MonotonicTime timestamp;
FloatPoint position;
double scale;
};
std::array<Data, maxHistoryDepth> m_positionHistory;
};
} // namespace WebCore
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