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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
*
* 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,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* 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.
*/
#pragma once
#include "FloatRoundedRect.h"
#include "PathElement.h"
#include "PathSegment.h"
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/UniqueRef.h>
namespace WebCore {
class PathImpl : public ThreadSafeRefCounted<PathImpl> {
WTF_MAKE_TZONE_ALLOCATED(PathImpl);
public:
virtual ~PathImpl() = default;
static constexpr float circleControlPoint()
{
// Approximation of control point positions on a bezier to simulate a quarter of a circle.
// This is 1-kappa, where kappa = 4 * (sqrt(2) - 1) / 3
return 0.447715;
}
virtual bool isPathStream() const { return false; }
virtual bool definitelyEqual(const PathImpl&) const = 0;
virtual Ref<PathImpl> copy() const = 0;
void addSegment(PathSegment);
virtual void add(PathMoveTo) = 0;
virtual void add(PathLineTo) = 0;
virtual void add(PathQuadCurveTo) = 0;
virtual void add(PathBezierCurveTo) = 0;
virtual void add(PathArcTo) = 0;
virtual void add(PathArc) = 0;
virtual void add(PathClosedArc) = 0;
virtual void add(PathEllipse) = 0;
virtual void add(PathEllipseInRect) = 0;
virtual void add(PathRect) = 0;
virtual void add(PathRoundedRect) = 0;
virtual void add(PathContinuousRoundedRect) = 0;
virtual void add(PathCloseSubpath) = 0;
void addLinesForRect(const FloatRect&);
void addBeziersForRoundedRect(const FloatRoundedRect&);
virtual void applySegments(const PathSegmentApplier&) const;
virtual bool applyElements(const PathElementApplier&) const = 0;
virtual bool transform(const AffineTransform&) = 0;
virtual std::optional<PathSegment> singleSegment() const { return std::nullopt; }
virtual std::optional<PathDataLine> singleDataLine() const { return std::nullopt; }
virtual std::optional<PathRect> singleRect() const { return std::nullopt; }
virtual std::optional<PathRoundedRect> singleRoundedRect() const { return std::nullopt; }
virtual std::optional<PathContinuousRoundedRect> singleContinuousRoundedRect() const { return std::nullopt; }
virtual std::optional<PathArc> singleArc() const { return std::nullopt; }
virtual std::optional<PathClosedArc> singleClosedArc() const { return std::nullopt; }
virtual std::optional<PathDataQuadCurve> singleQuadCurve() const { return std::nullopt; }
virtual std::optional<PathDataBezierCurve> singleBezierCurve() const { return std::nullopt; }
virtual bool isEmpty() const = 0;
virtual bool isClosed() const;
virtual bool hasSubpaths() const;
virtual FloatPoint currentPoint() const = 0;
virtual FloatRect fastBoundingRect() const = 0;
virtual FloatRect boundingRect() const = 0;
protected:
PathImpl() = default;
};
inline void PathImpl::addSegment(PathSegment segment)
{
WTF::switchOn(WTFMove(segment).data(),
[&](auto&& segment) {
add(WTFMove(segment));
},
[&](PathDataLine segment) {
add(PathMoveTo { segment.start });
add(PathLineTo { segment.end });
},
[&](PathDataQuadCurve segment) {
add(PathMoveTo { segment.start });
add(PathQuadCurveTo { segment.controlPoint, segment.endPoint });
},
[&](PathDataBezierCurve segment) {
add(PathMoveTo { segment.start });
add(PathBezierCurveTo { segment.controlPoint1, segment.controlPoint2, segment.endPoint });
},
[&](PathDataArc segment) {
add(PathMoveTo { segment.start });
add(PathArcTo { segment.controlPoint1, segment.controlPoint2, segment.radius });
});
}
} // namespace WebCore
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