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