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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.
*/
#pragma once
#include <WebCore/StyleLengthWrapper.h>
#include <wtf/Hasher.h>
namespace WebCore {
namespace Style {
// <'line-height'> = normal | <number [0,∞]> | <length-percentage [0,∞]>
// NOTE: <number [0,∞]> gets converted to <length-percentage [0,∞]>.
// https://drafts.csswg.org/css-inline/#propdef-line-height
struct LineHeight : LengthWrapperBase<LengthPercentage<CSS::NonnegativeUnzoomed>, CSS::Keyword::Normal> {
using Base::Base;
bool isNormal() const { return holdsAlternative<CSS::Keyword::Normal>(); }
unsigned valueForHash() const
{
return switchOn(
[&](const CSS::Keyword::Normal&) -> unsigned { return computeHash(0); },
[&](const Fixed& fixed) -> unsigned { return computeHash(1, fixed.unresolvedValue()); },
[&](const Percentage& percentage) -> unsigned { return computeHash(2, percentage.value); },
[&](const Calc&) -> unsigned { return computeHash(3); }
);
}
};
// MARK: - Conversion
template<> struct CSSValueConversion<LineHeight> {
auto operator()(BuilderState&, const CSSValue&, float multiplier = 1.0f) -> LineHeight;
auto operator()(BuilderState&, const CSSPrimitiveValue&, float multiplier = 1.0f) -> LineHeight;
};
// MARK: - Blending
template<> struct Blending<LineHeight> {
auto canBlend(const LineHeight&, const LineHeight&) -> bool;
auto requiresInterpolationForAccumulativeIteration(const LineHeight&, const LineHeight&) -> bool;
auto blend(const LineHeight&, const LineHeight&, const BlendingContext&) -> LineHeight;
};
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::LineHeight)
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