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/*
* Copyright (C) 2024 Samuel Weinig <sam@webkit.org>
*
* 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. ``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
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* 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 "CSSPrimitiveNumericTypes.h"
namespace WebCore {
namespace CSS {
// FIXME: Contexts that allow calc() should not be defined using a closed interval - https://drafts.csswg.org/css-values-4/#calc-range
// If spring() ever goes further with standardization, the allowable ranges for `mass` and `stiffness` should be reconsidered as the
// std::nextafter() clamping is non-obvious.
// <spring()> = spring( <number [>0,∞]> <number [>0,∞]> <number [0,∞]> <number> )
// Non-standard
struct SpringEasingParameters {
static constexpr auto NextAfterZero = std::numeric_limits<double>::denorm_min();
static constexpr auto Positive = Range { NextAfterZero, Range::infinity };
Number<Positive> mass;
Number<Positive> stiffness;
Number<Nonnegative> damping;
Number<> initialVelocity;
bool operator==(const SpringEasingParameters&) const = default;
};
using SpringEasingFunction = FunctionNotation<CSSValueSpring, SpringEasingParameters>;
template<size_t I> const auto& get(const SpringEasingParameters& value)
{
if constexpr (!I)
return value.mass;
else if constexpr (I == 1)
return value.stiffness;
else if constexpr (I == 2)
return value.damping;
else if constexpr (I == 3)
return value.initialVelocity;
}
} // namespace CSS
} // namespace WebCore
DEFINE_SPACE_SEPARATED_TUPLE_LIKE_CONFORMANCE(WebCore::CSS::SpringEasingParameters, 4)
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