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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 "StyleLengthWrapper+Blending.h"
#include "StyleLengthWrapper+CSSValueConversion.h"
#include "StylePrimitiveNumericTypes+Blending.h"
#include "StylePrimitiveNumericTypes+CSSValueConversion.h"
#include "StylePrimitiveNumericTypes+CSSValueCreation.h"
namespace WebCore {
namespace Style {
using namespace CSS::Literals;
TransformFunctionSizeDependencies Translate::computeSizeDependencies() const
{
if (RefPtr protectedValue = value)
return protectedValue->computeSizeDependencies();
return { };
}
void Translate::apply(TransformationMatrix& transform, const FloatSize& size) const
{
if (RefPtr protectedValue = value)
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 ? TransformFunctionType::Translate3D : TransformFunctionType::Translate;
auto tx = toStyleFromCSSValue<TranslateTransformFunction::LengthPercentage>(state, list->item(0));
auto ty = list->size() > 1 ? toStyleFromCSSValue<TranslateTransformFunction::LengthPercentage>(state, list->item(1)) : TranslateTransformFunction::LengthPercentage { 0_css_px };
auto tz = list->size() > 2 ? toStyleFromCSSValue<TranslateTransformFunction::Length>(state, list->item(2)) : TranslateTransformFunction::Length { 0_css_px };
return TranslateTransformFunction::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 TranslateTransformFunction::create(0_css_px, 0_css_px, 0_css_px, other.type());
};
auto fromFunction = fromTranslate ? Ref(*fromTranslate) : identity(*toTranslate);
auto toFunction = toTranslate ? Ref(*toTranslate) : identity(*fromTranslate);
// Ensure the two transforms have the same type.
if (!fromFunction->isSameType(toFunction)) {
RefPtr<const TranslateTransformFunction> normalizedFrom;
RefPtr<const TranslateTransformFunction> normalizedTo;
if (fromFunction->is3DOperation() || toFunction->is3DOperation()) {
normalizedFrom = TranslateTransformFunction::create(fromFunction->x(), fromFunction->y(), fromFunction->z(), TransformFunctionType::Translate3D);
normalizedTo = TranslateTransformFunction::create(toFunction->x(), toFunction->y(), toFunction->z(), TransformFunctionType::Translate3D);
} else {
normalizedFrom = TranslateTransformFunction::create(fromFunction->x(), fromFunction->y(), TransformFunctionType::Translate);
normalizedTo = TranslateTransformFunction::create(toFunction->x(), toFunction->y(), TransformFunctionType::Translate);
}
return blend(Translate { normalizedFrom.releaseNonNull() }, Translate { normalizedTo.releaseNonNull() }, context);
}
if (auto blendedFunction = toFunction->blend(fromFunction.ptr(), context); RefPtr translate = dynamicDowncast<TranslateTransformFunction>(blendedFunction))
return TranslateTransformFunction::create(translate->x(), translate->y(), translate->z(), translate->type());
return CSS::Keyword::None { };
}
// MARK: - Platform
auto ToPlatform<Translate>::operator()(const Translate& value, const FloatSize& size) -> RefPtr<TransformOperation>
{
if (RefPtr function = value.value)
return function->toPlatform(size);
return nullptr;
}
} // namespace Style
} // namespace WebCore
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