cc/base/invalidation_region.h

   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/geometry/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_