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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 "StylePerspective.h"
#include "StyleBuilderChecking.h"
#include "StylePrimitiveNumericTypes+Blending.h"
namespace WebCore {
namespace Style {
// MARK: - Conversion
auto CSSValueConversion<Perspective>::operator()(BuilderState& state, const CSSValue& value) -> Perspective
{
RefPtr primitiveValue = requiredDowncast<CSSPrimitiveValue>(state, value);
if (!primitiveValue)
return CSS::Keyword::None { };
if (primitiveValue->valueID() == CSSValueNone)
return CSS::Keyword::None { };
auto& conversionData = state.cssToLengthConversionData();
// NOTE: The isNumber() case below is only possible due to the `-webkit-perspective` legacy shorthand
// which extends the grammar to `<'perspective'> | <number [0,inf]>`.
float perspective = -1;
if (primitiveValue->isLength())
perspective = primitiveValue->resolveAsLength<float>(conversionData);
else if (primitiveValue->isNumber())
perspective = primitiveValue->resolveAsNumber<float>(conversionData) * conversionData.zoom();
else
ASSERT_NOT_REACHED();
// FIXME: This should probably clamp to 0, like other numeric values would, rather than return CSS::Keyword::None.
if (perspective < 0)
return CSS::Keyword::None { };
return Style::Perspective::Length { perspective };
}
// MARK: - Blending
auto Blending<Perspective>::canBlend(const Perspective& from, const Perspective& to) -> bool
{
return !from.isNone() && !to.isNone();
}
auto Blending<Perspective>::blend(const Perspective& from, const Perspective& to, const BlendingContext& context) -> Perspective
{
if (context.isDiscrete) {
ASSERT(!context.progress || context.progress == 1);
return context.progress ? to : from;
}
ASSERT(!from.isNone());
ASSERT(!to.isNone());
return { WebCore::Style::blend(*from.tryValue(), *to.tryValue(), context) };
}
} // namespace Style
} // namespace WebCore
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