#pragma once
#include "FloatPoint.h"
#include <wtf/MonotonicTime.h>
#include <wtf/Optional.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_FAST_ALLOCATED;
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;
} m_positionHistory[maxHistoryDepth];
};
}