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/*
* Copyright (C) 2010, 2011 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#ifndef Region_h
#define Region_h
#include "IntRect.h"
#include <wtf/ArgumentCoder.h>
#include <wtf/PointerComparison.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
namespace WebCore {
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(Region);
class Region {
WTF_MAKE_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(Region);
public:
WEBCORE_EXPORT Region();
WEBCORE_EXPORT Region(const IntRect&);
WEBCORE_EXPORT Region(const Region&);
WEBCORE_EXPORT Region(Region&&);
WEBCORE_EXPORT ~Region();
WEBCORE_EXPORT Region& operator=(const Region&);
WEBCORE_EXPORT Region& operator=(Region&&);
IntRect bounds() const { return m_bounds; }
bool isEmpty() const { return m_bounds.isEmpty(); }
bool isRect() const { return !m_shape; }
WEBCORE_EXPORT Vector<IntRect, 1> rects() const;
WEBCORE_EXPORT void unite(const Region&);
WEBCORE_EXPORT void intersect(const Region&);
WEBCORE_EXPORT void subtract(const Region&);
WEBCORE_EXPORT void translate(const IntSize&);
// Returns true if the query region is a subset of this region.
WEBCORE_EXPORT bool contains(const Region&) const;
WEBCORE_EXPORT bool contains(const IntPoint&) const;
// Returns true if the query region intersects any part of this region.
WEBCORE_EXPORT bool intersects(const Region&) const;
WEBCORE_EXPORT uint64_t totalArea() const;
unsigned gridSize() const { return m_shape ? m_shape->gridSize() : 0; }
struct Span {
int y { 0 };
size_t segmentIndex { 0 };
friend bool operator==(const Span&, const Span&) = default;
};
class Shape {
WTF_MAKE_TZONE_ALLOCATED_EXPORT(Shape, WEBCORE_EXPORT);
public:
Shape() = default;
WEBCORE_EXPORT Shape(const IntRect&);
IntRect bounds() const;
bool isEmpty() const { return m_spans.isEmpty(); }
bool isRect() const { return m_spans.size() <= 2 && m_segments.size() <= 2; }
unsigned gridSize() const { return m_spans.size() * m_segments.size(); }
std::span<const Span> spans() const { return m_spans.span(); }
std::span<const int> segments(std::span<const Span>) const;
static Shape unionShapes(const Shape& shape1, const Shape& shape2);
static Shape intersectShapes(const Shape& shape1, const Shape& shape2);
static Shape subtractShapes(const Shape& shape1, const Shape& shape2);
WEBCORE_EXPORT void translate(const IntSize&);
struct CompareContainsOperation;
struct CompareIntersectsOperation;
template<typename CompareOperation>
static bool compareShapes(const Shape& shape1, const Shape& shape2);
WEBCORE_EXPORT static bool isValidShape(std::span<const int> segments, std::span<const Span> spans);
static Shape createForTesting(Vector<int, 32>&& segments, Vector<Span, 16>&& spans) { return Shape { WTFMove(segments), WTFMove(spans) }; }
std::pair<Vector<int, 32>, Vector<Span, 16>> dataForTesting() const { return { m_segments, m_spans }; }
private:
WEBCORE_EXPORT Shape(Vector<int, 32>&&, Vector<Span, 16>&&);
struct UnionOperation;
struct IntersectOperation;
struct SubtractOperation;
template<typename Operation>
static Shape shapeOperation(const Shape& shape1, const Shape& shape2);
void appendSpan(int y);
void appendSpan(int y, std::span<const int> segments);
void appendSpans(const Shape&, std::span<const Span> spans);
bool canCoalesce(std::span<const int> segments);
Vector<int, 32> m_segments;
Vector<Span, 16> m_spans;
friend struct IPC::ArgumentCoder<WebCore::Region::Shape, void>;
friend bool operator==(const Shape&, const Shape&) = default;
WEBCORE_EXPORT friend WTF::TextStream& operator<<(WTF::TextStream&, const Shape&);
};
static Region createForTesting(Shape&& shape) { return Region { WTFMove(shape) }; }
Shape dataForTesting() const { return data(); }
private:
friend struct IPC::ArgumentCoder<WebCore::Region, void>;
explicit Region(Shape&& shape) { setShape(WTFMove(shape)); }
Shape data() const;
std::unique_ptr<Shape> copyShape() const { return m_shape ? makeUnique<Shape>(*m_shape) : nullptr; }
WEBCORE_EXPORT void setShape(Shape&&);
IntRect m_bounds;
std::unique_ptr<Shape> m_shape;
friend bool operator==(const Region&, const Region&);
};
inline Region::Shape Region::data() const
{
if (m_shape)
return *m_shape;
return m_bounds;
}
static inline Region intersect(const Region& a, const Region& b)
{
Region result(a);
result.intersect(b);
return result;
}
static inline Region subtract(const Region& a, const Region& b)
{
Region result(a);
result.subtract(b);
return result;
}
static inline Region translate(const Region& region, const IntSize& offset)
{
Region result(region);
result.translate(offset);
return result;
}
inline bool operator==(const Region& a, const Region& b)
{
return a.m_bounds == b.m_bounds && arePointingToEqualData(a.m_shape, b.m_shape);
}
WEBCORE_EXPORT WTF::TextStream& operator<<(WTF::TextStream&, const Region&);
WEBCORE_EXPORT WTF::TextStream& operator<<(WTF::TextStream&, const Region::Shape&);
} // namespace WebCore
#endif // Region_h
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