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| 1 // Copyright (c) 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CC_BASE_SIMPLE_ENCLOSED_REGION_H_ |
| 6 #define CC_BASE_SIMPLE_ENCLOSED_REGION_H_ |
| 7 |
| 8 #include <string> |
| 9 |
| 10 #include "cc/base/cc_export.h" |
| 11 #include "ui/gfx/rect.h" |
| 12 |
| 13 namespace cc { |
| 14 |
| 15 class Region; |
| 16 |
| 17 // A constant-sized approximation of a Region. The SimpleEnclosedRegion may |
| 18 // exclude points in its approximation (may have false negatives) but will never |
| 19 // include a point that would not be in the actual Region (no false positives). |
| 20 class CC_EXPORT SimpleEnclosedRegion { |
| 21 public: |
| 22 SimpleEnclosedRegion() : rect_() {} |
| 23 SimpleEnclosedRegion(const SimpleEnclosedRegion& region) |
| 24 : rect_(region.rect_) {} |
| 25 explicit SimpleEnclosedRegion(const gfx::Rect& rect) : rect_(rect) {} |
| 26 SimpleEnclosedRegion(int x, int y, int w, int h) : rect_(x, y, w, h) {} |
| 27 SimpleEnclosedRegion(int w, int h) : rect_(w, h) {} |
| 28 explicit SimpleEnclosedRegion(const Region& region); |
| 29 ~SimpleEnclosedRegion(); |
| 30 |
| 31 const SimpleEnclosedRegion& operator=(const gfx::Rect& rect) { |
| 32 rect_ = rect; |
| 33 return *this; |
| 34 } |
| 35 const SimpleEnclosedRegion& operator=(const SimpleEnclosedRegion& region) { |
| 36 rect_ = region.rect_; |
| 37 return *this; |
| 38 } |
| 39 |
| 40 bool IsEmpty() const { return rect_.IsEmpty(); } |
| 41 void Clear() { rect_ = gfx::Rect(); } |
| 42 size_t GetRegionComplexity() const { return rect_.IsEmpty() ? 0 : 1; } |
| 43 |
| 44 bool Contains(const gfx::Point& point) const { return rect_.Contains(point); } |
| 45 bool Contains(const gfx::Rect& rect) const { return rect_.Contains(rect); } |
| 46 bool Contains(const SimpleEnclosedRegion& region) const { |
| 47 return rect_.Contains(region.rect_); |
| 48 } |
| 49 |
| 50 bool Intersects(const gfx::Rect& rect) const { |
| 51 return rect_.Intersects(rect); |
| 52 } |
| 53 bool Intersects(const SimpleEnclosedRegion& region) const { |
| 54 return rect_.Intersects(region.rect_); |
| 55 } |
| 56 |
| 57 void Subtract(const gfx::Rect& sub_rect); |
| 58 void Subtract(const SimpleEnclosedRegion& sub_region) { |
| 59 Subtract(sub_region.rect_); |
| 60 } |
| 61 void Union(const gfx::Rect& new_rect); |
| 62 void Union(const SimpleEnclosedRegion& new_region) { |
| 63 Union(new_region.rect_); |
| 64 } |
| 65 void Intersect(const gfx::Rect& in_rect) { return rect_.Intersect(in_rect); } |
| 66 void Intersect(const SimpleEnclosedRegion& in_region) { |
| 67 Intersect(in_region.rect_); |
| 68 } |
| 69 |
| 70 bool Equals(const SimpleEnclosedRegion& other) const { |
| 71 bool both_empty = rect_.IsEmpty() && other.rect_.IsEmpty(); |
| 72 return both_empty || rect_ == other.rect_; |
| 73 } |
| 74 |
| 75 gfx::Rect bounds() const { return rect_; } |
| 76 |
| 77 // The value of |i| must be less than GetRegionComplexity(). |
| 78 gfx::Rect GetRect(size_t i) const; |
| 79 |
| 80 std::string ToString() const { return rect_.ToString(); } |
| 81 |
| 82 private: |
| 83 gfx::Rect rect_; |
| 84 }; |
| 85 |
| 86 inline bool operator==(const SimpleEnclosedRegion& a, |
| 87 const SimpleEnclosedRegion& b) { |
| 88 return a.Equals(b); |
| 89 } |
| 90 |
| 91 inline bool operator!=(const SimpleEnclosedRegion& a, |
| 92 const SimpleEnclosedRegion& b) { |
| 93 return !(a == b); |
| 94 } |
| 95 |
| 96 inline SimpleEnclosedRegion SubtractSimpleEnclosedRegions( |
| 97 const SimpleEnclosedRegion& a, |
| 98 const SimpleEnclosedRegion& b) { |
| 99 SimpleEnclosedRegion result = a; |
| 100 result.Subtract(b); |
| 101 return result; |
| 102 } |
| 103 |
| 104 inline SimpleEnclosedRegion IntersectSimpleEnclosedRegions( |
| 105 const SimpleEnclosedRegion& a, |
| 106 const SimpleEnclosedRegion& b) { |
| 107 SimpleEnclosedRegion result = a; |
| 108 result.Intersect(b); |
| 109 return result; |
| 110 } |
| 111 |
| 112 inline SimpleEnclosedRegion UnionSimpleEnclosedRegions( |
| 113 const SimpleEnclosedRegion& a, |
| 114 const SimpleEnclosedRegion& b) { |
| 115 SimpleEnclosedRegion result = a; |
| 116 result.Union(b); |
| 117 return result; |
| 118 } |
| 119 |
| 120 } // namespace cc |
| 121 |
| 122 #endif // CC_BASE_SIMPLE_ENCLOSED_REGION_H_ |
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