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/*
* Copyright (C) 2024 Samuel Weinig <sam@webkit.org>
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* 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 "StyleTextShadow.h"
#include "CSSTextShadowPropertyValue.h"
#include "ColorBlending.h"
#include "RenderStyle.h"
#include "StyleBuilderChecking.h"
#include "StylePrimitiveNumericTypes+Blending.h"
#include "StylePrimitiveNumericTypes+Conversions.h"
#include "StylePrimitiveNumericTypes+Evaluation.h"
#include "StylePrimitiveNumericTypes+Serialization.h"
#include "StyleShadowInterpolation.h"
#include <wtf/NeverDestroyed.h>
namespace WebCore {
namespace Style {
// MARK: - Conversion
auto ToCSS<TextShadow>::operator()(const TextShadow& value, const RenderStyle& style) -> CSS::TextShadow
{
return {
.color = toCSS(value.color, style),
.location = toCSS(value.location, style),
.blur = toCSS(value.blur, style),
};
}
auto ToStyle<CSS::TextShadow>::operator()(const CSS::TextShadow& value, const BuilderState& state) -> TextShadow
{
return {
.color = value.color ? toStyle(*value.color, state) : Color::currentColor(),
.location = toStyle(value.location, state),
.blur = value.blur ? toStyle(*value.blur, state) : Length<CSS::NonnegativeUnzoomed> { 0 },
};
}
Ref<CSSValue> CSSValueCreation<TextShadowList>::operator()(CSSValuePool&, const RenderStyle& style, const TextShadowList& value)
{
CSS::TextShadowProperty::List list;
for (const auto& shadow : makeReversedRange(value))
list.value.append(toCSS(shadow, style));
return CSSTextShadowPropertyValue::create(CSS::TextShadowProperty { WTFMove(list) });
}
auto CSSValueConversion<TextShadows>::operator()(BuilderState& state, const CSSValue& value) -> TextShadows
{
if (value.valueID() == CSSValueNone)
return CSS::Keyword::None { };
RefPtr shadow = requiredDowncast<CSSTextShadowPropertyValue>(state, value);
if (!shadow)
return CSS::Keyword::None { };
return WTF::switchOn(shadow->shadow(),
[&](const CSS::Keyword::None&) -> TextShadows {
return CSS::Keyword::None { };
},
[&](const typename CSS::TextShadowProperty::List& list) -> TextShadows {
return TextShadows::List::map(makeReversedRange(list), [&](const CSS::TextShadow& element) {
return toStyle(element, state);
});
}
);
}
// MARK: - Serialization
void Serialize<TextShadowList>::operator()(StringBuilder& builder, const CSS::SerializationContext& context, const RenderStyle& style, const TextShadowList& value)
{
serializationForCSSOnRangeLike(builder, context, style, makeReversedRange(value), SerializationSeparatorString<TextShadowList>);
}
// MARK: - Blending
auto Blending<TextShadow>::blend(const TextShadow& a, const TextShadow& b, const RenderStyle& aStyle, const RenderStyle& bStyle, const BlendingContext& context) -> TextShadow
{
return {
.color = WebCore::blend(aStyle.colorResolvingCurrentColor(a.color), bStyle.colorResolvingCurrentColor(b.color), context),
.location = WebCore::Style::blend(a.location, b.location, context),
.blur = WebCore::Style::blend(a.blur, b.blur, context),
};
}
struct MatchingTextShadows {
static const TextShadow& shadowForInterpolation(const TextShadow&)
{
static NeverDestroyed<const TextShadow> defaultShadowData {
TextShadow {
.color = { WebCore::Color::transparentBlack },
.location = { { 0 }, { 0 } },
.blur = { 0 },
}
};
return defaultShadowData.get();
}
};
auto Blending<TextShadows>::canBlend(const TextShadows& from, const TextShadows& to, CompositeOperation compositeOperation) -> bool
{
return ShadowInterpolation<TextShadows, MatchingTextShadows>::canInterpolate(from, to, compositeOperation);
}
auto Blending<TextShadows>::blend(const TextShadows& from, const TextShadows& to, const RenderStyle& fromStyle, const RenderStyle& toStyle, const BlendingContext& context) -> TextShadows
{
return ShadowInterpolation<TextShadows, MatchingTextShadows>::interpolate(from, to, fromStyle, toStyle, context);
}
} // namespace Style
} // namespace WebCore
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