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/*
* Copyright (C) 2025 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.
*/
#include "config.h"
#include "StyleCornerShapeValue.h"
#include "CSSFunctionValue.h"
#include "CSSPrimitiveValue.h"
#include "CSSValuePool.h"
#include "StyleBuilderChecking.h"
#include "StylePrimitiveNumericTypes+Blending.h"
#include "StylePrimitiveNumericTypes+CSSValueCreation.h"
namespace WebCore {
namespace Style {
// MARK: - Conversion
auto CSSValueConversion<CornerShapeValue>::operator()(BuilderState& state, const CSSValue& value) -> CornerShapeValue
{
if (auto* primitiveValue = dynamicDowncast<CSSPrimitiveValue>(value)) {
switch (primitiveValue->valueID()) {
case CSSValueRound:
return CornerShapeValue::round();
case CSSValueScoop:
return CornerShapeValue::scoop();
case CSSValueBevel:
return CornerShapeValue::bevel();
case CSSValueNotch:
return CornerShapeValue::notch();
case CSSValueStraight:
return CornerShapeValue::straight();
case CSSValueSquircle:
return CornerShapeValue::squircle();
default:
break;
}
state.setCurrentPropertyInvalidAtComputedValueTime();
return CornerShapeValue::round();
}
auto superellipseFunction = requiredFunctionDowncast<CSSValueSuperellipse, CSSPrimitiveValue>(state, value);
if (!superellipseFunction)
return CornerShapeValue::round();
Ref superellipseDescriptor = superellipseFunction->item(0);
if (superellipseDescriptor->valueID() == CSSValueInfinity)
return { SuperellipseFunction { Number<CSS::Nonnegative>(std::numeric_limits<double>::infinity()) } };
if (superellipseDescriptor->isNumber())
return { SuperellipseFunction { Number<CSS::Nonnegative>(std::max(0.0, superellipseDescriptor->resolveAsNumber<double>(state.cssToLengthConversionData()))) } };
state.setCurrentPropertyInvalidAtComputedValueTime();
return CornerShapeValue::round();
}
// MARK: - Blending
// https://drafts.csswg.org/css-borders-4/#corner-shape-interpolation
static Number<CSS::Nonnegative> convertExponentToInterpolationValue(const CornerShapeValue& cornerShape)
{
auto exponent = cornerShape.superellipse->value;
// 1. If exponent is 0, return 0.
if (exponent == 0.0)
return 0.0;
// 2. If exponent is ∞, return 1.
if (exponent == std::numeric_limits<double>::infinity())
return 1.0;
// 3. Return 1/(2^(1/exponent)).
return 1.0 / std::pow(2.0, 1.0 / exponent);
}
static CornerShapeValue convertInterpolationValueToExponent(Number<CSS::Nonnegative> interpolationValue)
{
// 1. If interpolationValue is 0, return 0.
if (interpolationValue.value == 0.0)
return { SuperellipseFunction { 0.0 } };
// 2. If interpolationValue is 1, return ∞.
if (interpolationValue.value == 1.0)
return { SuperellipseFunction { std::numeric_limits<double>::infinity() } };
// 3. Return ln(0.5)/ln(interpolationValue).
return { SuperellipseFunction { std::log(0.5) / std::log(interpolationValue.value) } };
}
auto Blending<CornerShapeValue>::blend(const CornerShapeValue& a, const CornerShapeValue& b, const BlendingContext& context) -> CornerShapeValue
{
auto aInterpolationValue = convertExponentToInterpolationValue(a);
auto bInterpolationValue = convertExponentToInterpolationValue(b);
auto interpolatedValue = Style::blend(aInterpolationValue, bInterpolationValue, context);
return convertInterpolationValueToExponent(interpolatedValue);
}
} // namespace Style
} // namespace WebCore
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