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/*
* Copyright (C) 2024 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 "StyleCircleFunction.h"
#include "FloatRect.h"
#include "GeometryUtilities.h"
#include "Path.h"
#include "StylePrimitiveNumericTypes+Blending.h"
#include "StylePrimitiveNumericTypes+Evaluation.h"
#include <wtf/TinyLRUCache.h>
namespace WebCore {
namespace Style {
// MARK: - Path Caching
struct CirclePathPolicy final : public TinyLRUCachePolicy<FloatRect, WebCore::Path> {
public:
static bool isKeyNull(const FloatRect& rect)
{
return rect.isEmpty();
}
static WebCore::Path createValueForKey(const FloatRect& rect)
{
WebCore::Path path;
path.addEllipseInRect(rect);
return path;
}
};
static const WebCore::Path& cachedCirclePath(const FloatRect& rect)
{
static NeverDestroyed<TinyLRUCache<FloatRect, WebCore::Path, 4, CirclePathPolicy>> cache;
return cache.get().get(rect);
}
// MARK: - Path Generation
FloatPoint resolvePosition(const Circle& value, FloatSize boundingBox)
{
return value.position ? evaluate(*value.position, boundingBox) : FloatPoint { boundingBox.width() / 2, boundingBox.height() / 2 };
}
float resolveRadius(const Circle& value, FloatSize boxSize, FloatPoint center)
{
return WTF::switchOn(value.radius,
[&](const Circle::Length& length) -> float {
return evaluate(length, boxSize.diagonalLength() / sqrtOfTwoFloat);
},
[&](const Circle::Extent& extent) -> float {
return WTF::switchOn(extent,
[&](CSS::Keyword::ClosestSide) -> float {
return distanceToClosestSide(center, boxSize);
},
[&](CSS::Keyword::FarthestSide) -> float {
return distanceToFarthestSide(center, boxSize);
},
[&](CSS::Keyword::ClosestCorner) -> float {
return distanceToClosestCorner(center, boxSize);
},
[&](CSS::Keyword::FarthestCorner) -> float {
return distanceToFarthestCorner(center, boxSize);
}
);
}
);
}
WebCore::Path pathForCenterCoordinate(const Circle& value, const FloatRect& boundingBox, FloatPoint center)
{
auto radius = resolveRadius(value, boundingBox.size(), center);
auto bounding = FloatRect {
center.x() - radius + boundingBox.x(),
center.y() - radius + boundingBox.y(),
radius * 2,
radius * 2
};
return cachedCirclePath(bounding);
}
WebCore::Path PathComputation<Circle>::operator()(const Circle& value, const FloatRect& boundingBox)
{
return pathForCenterCoordinate(value, boundingBox, resolvePosition(value, boundingBox.size()));
}
// MARK: - Blending
auto Blending<Circle>::canBlend(const Circle& a, const Circle& b) -> bool
{
auto canBlendRadius = [](const auto& radiusA, const auto& radiusB) {
return std::visit(WTF::makeVisitor(
[](const Circle::Length&, const Circle::Length&) {
return true;
},
[](const auto&, const auto&) {
// FIXME: Determine how to interpolate between keywords. See bug 125108.
return false;
}
), radiusA, radiusB);
};
return canBlendRadius(a.radius, b.radius)
&& WebCore::Style::canBlend(a.position, b.position);
}
auto Blending<Circle>::blend(const Circle& a, const Circle& b, const BlendingContext& context) -> Circle
{
auto blendRadius = [](const auto& radiusA, const auto& radiusB, const BlendingContext& context) -> Circle::RadialSize {
return std::visit(WTF::makeVisitor(
[&](const Circle::Length& lengthA, const Circle::Length& lengthB) -> Circle::RadialSize {
return WebCore::Style::blend(lengthA, lengthB, context);
},
[&](const auto& a, const auto&) -> Circle::RadialSize {
return a;
}
), radiusA, radiusB);
};
return {
.radius = blendRadius(a.radius, b.radius, context),
.position = WebCore::Style::blend(a.position, b.position, context),
};
}
} // namespace Style
} // namespace WebCore
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