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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.
*/
#include "config.h"
#include "StyleBackgroundSize.h"
#include "AnimationUtilities.h"
#include "CSSPrimitiveValue.h"
#include "CSSValuePair.h"
#include "StyleBuilderChecking.h"
#include "StyleLengthWrapper+Blending.h"
#include "StyleLengthWrapper+CSSValueConversion.h"
#include "StylePrimitiveKeyword+CSSValueCreation.h"
#include "StylePrimitiveKeyword+Serialization.h"
#include "StylePrimitiveNumericTypes+Blending.h"
#include "StylePrimitiveNumericTypes+CSSValueCreation.h"
#include "StylePrimitiveNumericTypes+Serialization.h"
namespace WebCore {
namespace Style {
// MARK: - Conversion
auto CSSValueConversion<BackgroundSize>::operator()(BuilderState& state, const CSSValue& value) -> BackgroundSize
{
if (RefPtr pair = dynamicDowncast<CSSValuePair>(value)) {
return BackgroundSize::LengthSize {
toStyleFromCSSValue<BackgroundSizeLength>(state, pair->first()),
toStyleFromCSSValue<BackgroundSizeLength>(state, pair->second()),
};
}
RefPtr primitiveValue = requiredDowncast<CSSPrimitiveValue>(state, value);
if (!primitiveValue)
return CSS::Keyword::Auto { };
if (primitiveValue->isValueID()) {
switch (primitiveValue->valueID()) {
case CSSValueAuto:
return CSS::Keyword::Auto { };
case CSSValueCover:
return CSS::Keyword::Cover { };
case CSSValueContain:
return CSS::Keyword::Contain { };
default:
break;
}
state.setCurrentPropertyInvalidAtComputedValueTime();
return CSS::Keyword::Auto { };
}
return toStyleFromCSSValue<BackgroundSizeLength>(state, *primitiveValue);
}
auto CSSValueCreation<BackgroundSize>::operator()(CSSValuePool& pool, const RenderStyle& style, const BackgroundSize& value) -> Ref<CSSValue>
{
return WTF::switchOn(value,
[&](const CSS::Keyword::Cover& keyword) -> Ref<CSSValue> {
return createCSSValue(pool, style, keyword);
},
[&](const CSS::Keyword::Contain& keyword) -> Ref<CSSValue> {
return createCSSValue(pool, style, keyword);
},
[&](const BackgroundSize::LengthSize& lengthSize) -> Ref<CSSValue> {
if (lengthSize.width().isAuto() && lengthSize.height().isAuto())
return createCSSValue(pool, style, CSS::Keyword::Auto { });
else
return createCSSValue(pool, style, lengthSize);
}
);
}
// MARK: - Serialization
void Serialize<BackgroundSize>::operator()(StringBuilder& builder, const CSS::SerializationContext& context, const RenderStyle& style, const BackgroundSize& value)
{
WTF::switchOn(value,
[&](const CSS::Keyword::Cover& keyword) {
serializationForCSS(builder, context, style, keyword);
},
[&](const CSS::Keyword::Contain& keyword) {
serializationForCSS(builder, context, style, keyword);
},
[&](const BackgroundSize::LengthSize& lengthSize) {
// FIXME: This should probably serialize just the first value if the second is `auto` but this currently causes a WPT test to fail.
if (lengthSize.width().isAuto() && lengthSize.height().isAuto())
serializationForCSS(builder, context, style, CSS::Keyword::Auto { });
else
serializationForCSS(builder, context, style, lengthSize);
}
);
}
// MARK: - Blending
auto Blending<BackgroundSize>::canBlend(const BackgroundSize& a, const BackgroundSize& b) -> bool
{
if (!a.hasSameType(b))
return false;
if (!a.isLengthSize())
return true;
return Style::canBlend(a.tryLengthSize()->width(), b.tryLengthSize()->width())
&& Style::canBlend(a.tryLengthSize()->height(), b.tryLengthSize()->height());
}
auto Blending<BackgroundSize>::blend(const BackgroundSize& a, const BackgroundSize& b, const BlendingContext& context) -> BackgroundSize
{
if (context.isDiscrete) {
ASSERT(!context.progress || context.progress == 1);
return context.progress ? b : a;
}
ASSERT(a.hasSameType(b));
if (!a.isLengthSize())
return context.progress ? b : a;
return BackgroundSize::LengthSize {
Style::blend(a.tryLengthSize()->width(), b.tryLengthSize()->width(), context),
Style::blend(a.tryLengthSize()->height(), b.tryLengthSize()->height(), context),
};
}
} // namespace Style
} // namespace WebCore
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