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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_BASE_REGION_H_
#define CC_BASE_REGION_H_
#include <iosfwd>
#include <memory>
#include <string>
#include "cc/base/base_export.h"
#include "third_party/skia/include/core/SkRegion.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/skia_conversions.h"
class SkPath;
namespace base {
namespace trace_event {
class TracedValue;
}
} // namespace base
namespace gfx {
class Vector2d;
}
namespace cc {
class SimpleEnclosedRegion;
class CC_BASE_EXPORT Region {
public:
Region();
explicit Region(const SkRegion& region);
Region(const Region& region);
Region(const gfx::Rect& rect); // NOLINT(runtime/explicit)
~Region();
const Region& operator=(const gfx::Rect& rect);
const Region& operator=(const Region& region);
const Region& operator+=(const gfx::Vector2d& offset);
// Returns a reference to a global empty Region. This should only be used for
// functions that need to return a reference to a Region, not instead of the
// default constructor.
static const Region& Empty();
void Swap(Region* region);
void Clear();
bool IsEmpty() const;
int GetRegionComplexity() const;
void GetBoundaryPath(SkPath* path) const;
bool Contains(const gfx::Point& point) const;
bool Contains(const gfx::Rect& rect) const;
bool Contains(const Region& region) const;
bool Intersects(const gfx::Rect& rect) const;
bool Intersects(const Region& region) const;
void Subtract(const gfx::Rect& rect);
void Subtract(const Region& region);
void Subtract(const SimpleEnclosedRegion& region);
void Union(const gfx::Rect& rect);
void Union(const Region& region);
void Intersect(const gfx::Rect& rect);
void Intersect(const Region& region);
bool Equals(const Region& other) const {
return skregion_ == other.skregion_;
}
gfx::Rect bounds() const {
return gfx::SkIRectToRect(skregion_.getBounds());
}
std::string ToString() const;
void AsValueInto(base::trace_event::TracedValue* array) const;
// Iterator for iterating through the gfx::Rects contained in this Region.
// We only support forward iteration as the underlying SkRegion::Iterator
// only supports forward iteration.
class CC_BASE_EXPORT Iterator {
public:
Iterator() = default;
~Iterator() = default;
gfx::Rect operator*() const { return gfx::SkIRectToRect(it_.rect()); }
Iterator& operator++() {
it_.next();
return *this;
}
bool operator==(const Iterator& b) const {
// This should only be used to compare to end().
DCHECK(b.it_.done());
return it_.done();
}
bool operator!=(const Iterator& b) const { return !(*this == b); }
private:
explicit Iterator(const Region& region);
friend class Region;
SkRegion::Iterator it_;
};
Iterator begin() const;
Iterator end() const { return Iterator(); }
private:
SkRegion skregion_;
};
inline bool operator==(const Region& a, const Region& b) {
return a.Equals(b);
}
inline bool operator!=(const Region& a, const Region& b) {
return !(a == b);
}
inline Region operator+(const Region& a, const gfx::Vector2d& b) {
Region result = a;
result += b;
return result;
}
inline Region SubtractRegions(const Region& a, const Region& b) {
Region result = a;
result.Subtract(b);
return result;
}
inline Region SubtractRegions(const Region& a, const gfx::Rect& b) {
Region result = a;
result.Subtract(b);
return result;
}
inline Region IntersectRegions(const Region& a, const Region& b) {
Region result = a;
result.Intersect(b);
return result;
}
inline Region IntersectRegions(const Region& a, const gfx::Rect& b) {
Region result = a;
result.Intersect(b);
return result;
}
inline Region UnionRegions(const Region& a, const Region& b) {
Region result = a;
result.Union(b);
return result;
}
inline Region UnionRegions(const Region& a, const gfx::Rect& b) {
Region result = a;
result.Union(b);
return result;
}
// This is declared here for use in gtest-based unit tests but is defined in
// the //cc:test_support target. Depend on that to use this in your unit test.
// This should not be used in production code - call ToString() instead.
void PrintTo(const Region& region, std::ostream* os);
} // namespace cc
#endif // CC_BASE_REGION_H_
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