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