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      1 // Copyright 2013 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_INVALIDATION_REGION_H_
      6 #define CC_BASE_INVALIDATION_REGION_H_
      7 
      8 #include "cc/base/cc_export.h"
      9 #include "cc/base/region.h"
     10 #include "ui/gfx/rect.h"
     11 
     12 namespace cc {
     13 
     14 // This class behaves similarly to Region, but it may have false positives. That
     15 // is, InvalidationRegion can be simplified to encompass a larger area than the
     16 // collection of rects unioned.
     17 class CC_EXPORT InvalidationRegion {
     18  public:
     19   InvalidationRegion();
     20   ~InvalidationRegion();
     21 
     22   void Swap(Region* region);
     23   void Clear();
     24   void Union(const gfx::Rect& rect);
     25   bool IsEmpty() const { return region_.IsEmpty(); }
     26 
     27  private:
     28   void SimplifyIfNeeded();
     29 
     30   Region region_;
     31 };
     32 
     33 }  // namespace cc
     34 
     35 #endif  // CC_BASE_INVALIDATION_REGION_H_
     36