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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 "StyleOffsetAnchor.h"
#include "CSSPositionValue.h"
#include "RenderStyleInlines.h"
#include "StyleBuilderChecking.h"
#include "StyleLengthWrapper+Blending.h"
#include "StylePrimitiveNumericTypes+Blending.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
namespace Style {
#if ENABLE(THREADED_ANIMATION_RESOLUTION)
auto OffsetAnchor::convert(const AcceleratedEffectOffsetAnchor& value) -> Variant<CSS::Keyword::Auto, Position>
{
if (!value.value)
return CSS::Keyword::Auto { };
return Position { *value.value };
}
#endif
// MARK: - Conversion
auto CSSValueConversion<OffsetAnchor>::operator()(BuilderState& state, const CSSValue& value) -> OffsetAnchor
{
if (value.valueID() == CSSValueAuto)
return OffsetAnchor { CSS::Keyword::Auto { } };
RefPtr positionValue = requiredDowncast<CSSPositionValue>(state, value);
if (!positionValue)
return RenderStyle::initialOffsetAnchor();
return OffsetAnchor { toStyle(positionValue->position(), state) };
}
// MARK: - Blending
auto Blending<OffsetAnchor>::canBlend(const OffsetAnchor& a, const OffsetAnchor& b) -> bool
{
return a.isPosition() && b.isPosition();
}
auto Blending<OffsetAnchor>::requiresInterpolationForAccumulativeIteration(const OffsetAnchor& a, const OffsetAnchor& b) -> bool
{
ASSERT(canBlend(a, b));
return Style::requiresInterpolationForAccumulativeIteration(*a.tryPosition(), *b.tryPosition());
}
auto Blending<OffsetAnchor>::blend(const OffsetAnchor& a, const OffsetAnchor& b, const BlendingContext& context) -> OffsetAnchor
{
if (context.isDiscrete) {
ASSERT(!context.progress || context.progress == 1.0);
return context.progress ? b : a;
}
ASSERT(canBlend(a, b));
return OffsetAnchor { Style::blend(*a.tryPosition(), *b.tryPosition(), context) };
}
// MARK: - Evaluation
#if ENABLE(THREADED_ANIMATION_RESOLUTION)
auto Evaluation<OffsetAnchor, AcceleratedEffectOffsetAnchor>::operator()(const OffsetAnchor& value, FloatSize referenceBox, ZoomNeeded token) -> AcceleratedEffectOffsetAnchor
{
return WTF::switchOn(value,
[&](const Position& position) -> AcceleratedEffectOffsetAnchor {
return { .value = evaluate<FloatPoint>(position, referenceBox, token) };
},
[](const CSS::Keyword::Auto&) -> AcceleratedEffectOffsetAnchor {
return { .value = std::nullopt };
}
);
}
#endif
} // namespace Style
} // namespace WebCore
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