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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,
* 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.
*/
#pragma once
#include <WebCore/StyleLengthWrapper.h>
namespace WebCore {
namespace Style {
struct BackgroundSizeLength : LengthWrapperBase<LengthPercentage<CSS::Nonnegative>, CSS::Keyword::Auto> {
using Base::Base;
ALWAYS_INLINE bool isAuto() const { return holdsAlternative<CSS::Keyword::Auto>(); }
bool isKnownZeroOrAuto() const
{
return switchOn(
[](const Base::Fixed& fixed) {
return fixed.isZero();
},
[](const Base::Percentage& percentage) {
return percentage.isZero();
},
[](const Base::Calc&) {
return false;
},
[](const CSS::Keyword::Auto&) {
return true;
}
);
}
};
// <bg-size> = [ <length-percentage [0,∞]> | auto ]{1,2}@(default=auto) | cover | contain
// https://www.w3.org/TR/css-backgrounds-3/#typedef-bg-size
struct BackgroundSize {
using LengthSize = SpaceSeparatedSize<BackgroundSizeLength>;
BackgroundSize(CSS::Keyword::Auto keyword)
: m_value { LengthSize { keyword, keyword } }
{
}
BackgroundSize(BackgroundSizeLength&& value)
: m_value { LengthSize { value, CSS::Keyword::Auto { } } }
{
}
BackgroundSize(LengthSize&& value)
: m_value { WTF::move(value) }
{
}
BackgroundSize(CSS::Keyword::Cover keyword)
: m_value { keyword }
{
}
BackgroundSize(CSS::Keyword::Contain contain)
: m_value { contain }
{
}
bool isCover() const { return WTF::holdsAlternative<CSS::Keyword::Cover>(m_value); }
bool isContain() const { return WTF::holdsAlternative<CSS::Keyword::Contain>(m_value); }
bool isLengthSize() const { return WTF::holdsAlternative<LengthSize>(m_value); }
std::optional<LengthSize> tryLengthSize() const
{
if (auto* lengthSize = std::get_if<LengthSize>(&m_value))
return std::make_optional(*lengthSize);
return { };
}
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
return WTF::switchOn(m_value, std::forward<F>(f)...);
}
// FIXME: This name is confusing, given it can't really guarantee empty.
bool isEmpty() const
{
if (auto* lengthSize = std::get_if<LengthSize>(&m_value))
return lengthSize->width().isKnownZeroOrAuto() || lengthSize->height().isKnownZeroOrAuto();
return false;
}
bool specifiedHeight() const
{
if (auto* lengthSize = std::get_if<LengthSize>(&m_value))
return !lengthSize->height().isAuto();
return false;
}
bool specifiedWidth() const
{
if (auto* lengthSize = std::get_if<LengthSize>(&m_value))
return !lengthSize->width().isAuto();
return false;
}
bool operator==(const BackgroundSize&) const = default;
bool hasSameType(const BackgroundSize& other) const { return m_value.index() == other.m_value.index(); }
private:
Variant<LengthSize, CSS::Keyword::Cover, CSS::Keyword::Contain> m_value;
};
// MARK: - Conversion
template<> struct CSSValueConversion<BackgroundSize> { auto operator()(BuilderState&, const CSSValue&) -> BackgroundSize; };
template<> struct CSSValueCreation<BackgroundSize> { auto operator()(CSSValuePool&, const RenderStyle&, const BackgroundSize&) -> Ref<CSSValue>; };
// MARK: - Serialization
template<> struct Serialize<BackgroundSize> { void operator()(StringBuilder&, const CSS::SerializationContext&, const RenderStyle&, const BackgroundSize&); };
// MARK: - Blending
template<> struct Blending<BackgroundSize> {
auto canBlend(const BackgroundSize&, const BackgroundSize&) -> bool;
auto blend(const BackgroundSize&, const BackgroundSize&, const BlendingContext&) -> BackgroundSize;
};
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::BackgroundSizeLength)
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::BackgroundSize)
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