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/*
* Copyright (C) 2011 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
* 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.
*/
#ifndef AnimationUtilities_h
#define AnimationUtilities_h
#include "platform/LayoutUnit.h"
#include "platform/PlatformExport.h"
#include "platform/geometry/FloatPoint.h"
#include "platform/geometry/IntPoint.h"
#include "wtf/MathExtras.h"
#include "wtf/TypeTraits.h"
namespace blink {
inline int blend(int from, int to, double progress)
{
return lround(from + (to - from) * progress);
}
// For unsigned types.
template <typename T>
inline T blend(T from, T to, double progress)
{
static_assert(WTF::IsInteger<T>::value, "blend can only be used with integer types");
return clampTo<T>(round(to > from ? from + (to - from) * progress : from - (from - to) * progress));
}
inline double blend(double from, double to, double progress)
{
return from + (to - from) * progress;
}
inline float blend(float from, float to, double progress)
{
return static_cast<float>(from + (to - from) * progress);
}
inline LayoutUnit blend(LayoutUnit from, LayoutUnit to, double progress)
{
return from + (to - from) * progress;
}
inline IntPoint blend(const IntPoint& from, const IntPoint& to, double progress)
{
return IntPoint(blend(from.x(), to.x(), progress), blend(from.y(), to.y(), progress));
}
inline FloatPoint blend(const FloatPoint& from, const FloatPoint& to, double progress)
{
return FloatPoint(blend(from.x(), to.x(), progress), blend(from.y(), to.y(), progress));
}
// Calculates the accuracy for evaluating a timing function for an animation with the specified duration.
inline double accuracyForDuration(double duration)
{
return 1.0 / (200.0 * duration);
}
} // namespace blink
#endif // AnimationUtilities_h