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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 "StyleTranslate.h"
#include "CSSPrimitiveValueMappings.h"
#include "StyleBuilderChecking.h"
#include "StyleBuilderConverter.h"
#include "StylePrimitiveNumericTypes+Blending.h"
namespace WebCore {
namespace Style {
bool Translate::apply(TransformationMatrix& transform, const FloatSize& size) const
{
RefPtr protectedValue = value;
return protectedValue && protectedValue->apply(transform, size);
}
// MARK: - Conversion
auto CSSValueConversion<Translate>::operator()(BuilderState& state, const CSSValue& value) -> Translate
{
// https://drafts.csswg.org/css-transforms-2/#propdef-translate
// none | <length-percentage> [ <length-percentage> <length>? ]?
if (RefPtr primitiveValue = dynamicDowncast<CSSPrimitiveValue>(value)) {
ASSERT_UNUSED(primitiveValue, primitiveValue->valueID() == CSSValueNone);
return CSS::Keyword::None { };
}
auto list = requiredListDowncast<CSSValueList, CSSPrimitiveValue>(state, value);
if (!list)
return CSS::Keyword::None { };
auto type = list->size() > 2 ? TransformOperation::Type::Translate3D : TransformOperation::Type::Translate;
auto tx = BuilderConverter::convertLength(state, list->item(0));
auto ty = list->size() > 1 ? BuilderConverter::convertLength(state, list->item(1)) : WebCore::Length(0, LengthType::Fixed);
auto tz = list->size() > 2 ? BuilderConverter::convertLength(state, list->item(2)) : WebCore::Length(0, LengthType::Fixed);
return Translate { TranslateTransformOperation::create(WTFMove(tx), WTFMove(ty), WTFMove(tz), type) };
}
// MARK: - Blending
auto Blending<Translate>::blend(const Translate& from, const Translate& to, const BlendingContext& context) -> Translate
{
RefPtr fromTranslate = from.value;
RefPtr toTranslate = to.value;
if (!fromTranslate && !toTranslate)
return CSS::Keyword::None { };
auto identity = [&](const auto& other) {
return TranslateTransformOperation::create(WebCore::Length(0, LengthType::Fixed), WebCore::Length(0, LengthType::Fixed), WebCore::Length(0, LengthType::Fixed), other.type());
};
auto fromOperation = fromTranslate ? Ref(*fromTranslate) : identity(*toTranslate);
auto toOperation = toTranslate ? Ref(*toTranslate) : identity(*fromTranslate);
// Ensure the two transforms have the same type.
if (!fromOperation->isSameType(toOperation)) {
RefPtr<TranslateTransformOperation> normalizedFrom;
RefPtr<TranslateTransformOperation> normalizedTo;
if (fromOperation->is3DOperation() || toOperation->is3DOperation()) {
normalizedFrom = TranslateTransformOperation::create(fromOperation->x(), fromOperation->y(), fromOperation->z(), TransformOperation::Type::Translate3D);
normalizedTo = TranslateTransformOperation::create(toOperation->x(), toOperation->y(), toOperation->z(), TransformOperation::Type::Translate3D);
} else {
normalizedFrom = TranslateTransformOperation::create(fromOperation->x(), fromOperation->y(), TransformOperation::Type::Translate);
normalizedTo = TranslateTransformOperation::create(toOperation->x(), toOperation->y(), TransformOperation::Type::Translate);
}
return blend(Translate { normalizedFrom.releaseNonNull() }, Translate { normalizedTo.releaseNonNull() }, context);
}
if (auto blendedOperation = toOperation->blend(fromOperation.ptr(), context); RefPtr translate = dynamicDowncast<TranslateTransformOperation>(blendedOperation))
return Translate { TranslateTransformOperation::create(translate->x(), translate->y(), translate->z(), translate->type()) };
return CSS::Keyword::None { };
}
// MARK: - Platform
auto ToPlatform<Translate>::operator()(const Translate& value) -> RefPtr<Translate::Platform>
{
return value.value;
}
} // namespace Style
} // namespace WebCore
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