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// Copyright 2014 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_SIMPLE_ENCLOSED_REGION_H_
#define CC_BASE_SIMPLE_ENCLOSED_REGION_H_
#include <stddef.h>
#include <string>
#include "cc/base/base_export.h"
#include "ui/gfx/geometry/rect.h"
namespace cc {
class Region;
// A constant-sized approximation of a Region. The SimpleEnclosedRegion may
// exclude points in its approximation (may have false negatives) but will never
// include a point that would not be in the actual Region (no false positives).
class CC_BASE_EXPORT SimpleEnclosedRegion {
public:
SimpleEnclosedRegion() : rect_() {}
SimpleEnclosedRegion(const SimpleEnclosedRegion& region)
: rect_(region.rect_) {}
explicit SimpleEnclosedRegion(const gfx::Rect& rect) : rect_(rect) {}
SimpleEnclosedRegion(int x, int y, int w, int h) : rect_(x, y, w, h) {}
SimpleEnclosedRegion(int w, int h) : rect_(w, h) {}
explicit SimpleEnclosedRegion(const Region& region);
~SimpleEnclosedRegion();
const SimpleEnclosedRegion& operator=(const gfx::Rect& rect) {
rect_ = rect;
return *this;
}
const SimpleEnclosedRegion& operator=(const SimpleEnclosedRegion& region) {
rect_ = region.rect_;
return *this;
}
bool IsEmpty() const { return rect_.IsEmpty(); }
void Clear() { rect_ = gfx::Rect(); }
size_t GetRegionComplexity() const { return rect_.IsEmpty() ? 0 : 1; }
bool Contains(const gfx::Point& point) const { return rect_.Contains(point); }
bool Contains(const gfx::Rect& rect) const { return rect_.Contains(rect); }
bool Contains(const SimpleEnclosedRegion& region) const {
return rect_.Contains(region.rect_);
}
bool Intersects(const gfx::Rect& rect) const {
return rect_.Intersects(rect);
}
bool Intersects(const SimpleEnclosedRegion& region) const {
return rect_.Intersects(region.rect_);
}
void Subtract(const gfx::Rect& sub_rect);
void Subtract(const SimpleEnclosedRegion& sub_region) {
Subtract(sub_region.rect_);
}
void Union(const gfx::Rect& new_rect);
void Union(const SimpleEnclosedRegion& new_region) {
Union(new_region.rect_);
}
void Intersect(const gfx::Rect& in_rect) { return rect_.Intersect(in_rect); }
void Intersect(const SimpleEnclosedRegion& in_region) {
Intersect(in_region.rect_);
}
bool Equals(const SimpleEnclosedRegion& other) const {
bool both_empty = rect_.IsEmpty() && other.rect_.IsEmpty();
return both_empty || rect_ == other.rect_;
}
gfx::Rect bounds() const { return rect_; }
// The value of |i| must be less than GetRegionComplexity().
gfx::Rect GetRect(size_t i) const;
std::string ToString() const { return rect_.ToString(); }
private:
gfx::Rect rect_;
};
inline bool operator==(const SimpleEnclosedRegion& a,
const SimpleEnclosedRegion& b) {
return a.Equals(b);
}
inline bool operator!=(const SimpleEnclosedRegion& a,
const SimpleEnclosedRegion& b) {
return !(a == b);
}
inline SimpleEnclosedRegion SubtractSimpleEnclosedRegions(
const SimpleEnclosedRegion& a,
const SimpleEnclosedRegion& b) {
SimpleEnclosedRegion result = a;
result.Subtract(b);
return result;
}
inline SimpleEnclosedRegion IntersectSimpleEnclosedRegions(
const SimpleEnclosedRegion& a,
const SimpleEnclosedRegion& b) {
SimpleEnclosedRegion result = a;
result.Intersect(b);
return result;
}
inline SimpleEnclosedRegion UnionSimpleEnclosedRegions(
const SimpleEnclosedRegion& a,
const SimpleEnclosedRegion& b) {
SimpleEnclosedRegion result = a;
result.Union(b);
return result;
}
} // namespace cc
#endif // CC_BASE_SIMPLE_ENCLOSED_REGION_H_
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