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/memory/scoped_ptr.h"
  11 #include "cc/base/cc_export.h"
  12 #include "third_party/skia/include/core/SkRegion.h"
  13 #include "ui/gfx/geometry/rect.h"
  14 #include "ui/gfx/skia_util.h"
  15
  16 namespace base {
  17 class Value;
  18 namespace trace_event {
  19 class TracedValue;
  20 }
  21 }
  22
  23 namespace cc {
  24 class SimpleEnclosedRegion;
  25
  26 class CC_EXPORT Region {
  27  public:
  28   Region();
  29   Region(const Region& region);
  30   Region(const gfx::Rect& rect);  // NOLINT(runtime/explicit)
  31   ~Region();
  32
  33   const Region& operator=(const gfx::Rect& rect);
  34   const Region& operator=(const Region& region);
  35
  36   void Swap(Region* region);
  37   void Clear();
  38   bool IsEmpty() const;
  39   int GetRegionComplexity() const;
  40
  41   bool Contains(const gfx::Point& point) const;
  42   bool Contains(const gfx::Rect& rect) const;
  43   bool Contains(const Region& region) const;
  44
  45   bool Intersects(const gfx::Rect& rect) const;
  46   bool Intersects(const Region& region) const;
  47
  48   void Subtract(const gfx::Rect& rect);
  49   void Subtract(const Region& region);
  50   void Subtract(const SimpleEnclosedRegion& region);
  51   void Union(const gfx::Rect& rect);
  52   void Union(const Region& region);
  53   void Intersect(const gfx::Rect& rect);
  54   void Intersect(const Region& region);
  55
  56   bool Equals(const Region& other) const {
  57     return skregion_ == other.skregion_;
  58   }
  59
  60   gfx::Rect bounds() const {
  61     return gfx::SkIRectToRect(skregion_.getBounds());
  62   }
  63
  64   std::string ToString() const;
  65   scoped_ptr<base::Value> AsValue() const;
  66   void AsValueInto(base::trace_event::TracedValue* array) const;
  67
  68   class CC_EXPORT Iterator {
  69    public:
  70     Iterator();
  71     explicit Iterator(const Region& region);
  72     ~Iterator();
  73
  74     gfx::Rect rect() const {
  75       return gfx::SkIRectToRect(it_.rect());
  76     }
  77
  78     void next() {
  79       it_.next();
  80     }
  81
  82     bool has_rect() const {
  83       return !it_.done();
  84     }
  85
  86    private:
  87     SkRegion::Iterator it_;
  88   };
  89
  90  private:
  91   SkRegion skregion_;
  92 };
  93
  94 inline bool operator==(const Region& a, const Region& b) {
  95   return a.Equals(b);
  96 }
  97
  98 inline bool operator!=(const Region& a, const Region& b) {
  99   return !(a == b);
 100 }
 101
 102 inline Region SubtractRegions(const Region& a, const Region& b) {
 103   Region result = a;
 104   result.Subtract(b);
 105   return result;
 106 }
 107
 108 inline Region SubtractRegions(const Region& a, const gfx::Rect& b) {
 109   Region result = a;
 110   result.Subtract(b);
 111   return result;
 112 }
 113
 114 inline Region IntersectRegions(const Region& a, const Region& b) {
 115   Region result = a;
 116   result.Intersect(b);
 117   return result;
 118 }
 119
 120 inline Region IntersectRegions(const Region& a, const gfx::Rect& b) {
 121   Region result = a;
 122   result.Intersect(b);
 123   return result;
 124 }
 125
 126 inline Region UnionRegions(const Region& a, const Region& b) {
 127   Region result = a;
 128   result.Union(b);
 129   return result;
 130 }
 131
 132 inline Region UnionRegions(const Region& a, const gfx::Rect& b) {
 133   Region result = a;
 134   result.Union(b);
 135   return result;
 136 }
 137
 138 }  // namespace cc
 139
 140 #endif  // CC_BASE_REGION_H_