cc/base/region.h

   1 // Copyright (c) 2012 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_REGION_H_
   6 #define CC_BASE_REGION_H_
   7
   8 #include <string>
   9
  10 #include "base/logging.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "cc/base/cc_export.h"
  13 #include "third_party/skia/include/core/SkRegion.h"
  14 #include "ui/gfx/rect.h"
  15 #include "ui/gfx/skia_util.h"
  16
  17 namespace base {
  18 class Value;
  19 }
  20
  21 namespace cc {
  22
  23 class CC_EXPORT Region {
  24  public:
  25   Region();
  26   Region(const Region& region);
  27   Region(const gfx::Rect& rect);  // NOLINT(runtime/explicit)
  28   ~Region();
  29
  30   const Region& operator=(const gfx::Rect& rect);
  31   const Region& operator=(const Region& region);
  32
  33   void Swap(Region* region);
  34   void Clear();
  35   bool IsEmpty() const;
  36   int GetRegionComplexity() const;
  37
  38   bool Contains(gfx::Point point) const;
  39   bool Contains(const gfx::Rect& rect) const;
  40   bool Contains(const Region& region) const;
  41
  42   bool Intersects(const gfx::Rect& rect) const;
  43   bool Intersects(const Region& region) const;
  44
  45   void Subtract(const gfx::Rect& rect);
  46   void Subtract(const Region& region);
  47   void Union(const gfx::Rect& rect);
  48   void Union(const Region& region);
  49   void Intersect(const gfx::Rect& rect);
  50   void Intersect(const Region& region);
  51
  52   bool Equals(const Region& other) const {
  53     return skregion_ == other.skregion_;
  54   }
  55
  56   gfx::Rect bounds() const {
  57     return gfx::SkIRectToRect(skregion_.getBounds());
  58   }
  59
  60   std::string ToString() const;
  61   scoped_ptr<base::Value> AsValue() const;
  62
  63   class CC_EXPORT Iterator {
  64    public:
  65     Iterator();
  66     explicit Iterator(const Region& region);
  67     ~Iterator();
  68
  69     gfx::Rect rect() const {
  70       return gfx::SkIRectToRect(it_.rect());
  71     }
  72
  73     void next() {
  74       it_.next();
  75     }
  76
  77     bool has_rect() const {
  78       return !it_.done();
  79     }
  80
  81    private:
  82     SkRegion::Iterator it_;
  83   };
  84
  85  private:
  86   SkRegion skregion_;
  87 };
  88
  89 inline bool operator==(const Region& a, const Region& b) {
  90   return a.Equals(b);
  91 }
  92
  93 inline bool operator!=(const Region& a, const Region& b) {
  94   return !(a == b);
  95 }
  96
  97 inline Region SubtractRegions(const Region& a, const Region& b) {
  98   Region result = a;
  99   result.Subtract(b);
 100   return result;
 101 }
 102
 103 inline Region SubtractRegions(const Region& a, const gfx::Rect& b) {
 104   Region result = a;
 105   result.Subtract(b);
 106   return result;
 107 }
 108
 109 inline Region IntersectRegions(const Region& a, const Region& b) {
 110   Region result = a;
 111   result.Intersect(b);
 112   return result;
 113 }
 114
 115 inline Region IntersectRegions(const Region& a, const gfx::Rect& b) {
 116   Region result = a;
 117   result.Intersect(b);
 118   return result;
 119 }
 120
 121 inline Region UnionRegions(const Region& a, const Region& b) {
 122   Region result = a;
 123   result.Union(b);
 124   return result;
 125 }
 126
 127 inline Region UnionRegions(const Region& a, const gfx::Rect& b) {
 128   Region result = a;
 129   result.Union(b);
 130   return result;
 131 }
 132
 133 }  // namespace cc
 134
 135 #endif  // CC_BASE_REGION_H_