1// Copyright 2014 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 UI_VIEWS_CULL_SET_H_ 6#define UI_VIEWS_CULL_SET_H_ 7 8#include "base/containers/hash_tables.h" 9#include "base/macros.h" 10#include "base/memory/scoped_ptr.h" 11#include "ui/views/views_export.h" 12 13namespace views { 14 15class View; 16 17// A CullSet defines a set of View pointers which have been possibly culled 18// from painting or other bounds-checking operations. It wraps a set of 19// pointers to views, or NULL if no such set is available. 20class VIEWS_EXPORT CullSet { 21 public: 22 // Default constructor builds a CullSet that will always return true for 23 // ShouldPaint(). 24 CullSet(); 25 ~CullSet(); 26 27 // Wraps a set of pointers to Views, as might be provided by 28 // gfx::RTree::Query(), that intersect the damage rect and therefore need 29 // to be painted. CullSet takes ownership of the provided pointer. 30 CullSet(scoped_ptr<base::hash_set<intptr_t> > cull_set); 31 32 // Returns true if |view| needs to be painted. 33 bool ShouldPaint(const View* view) const; 34 35 private: 36 friend class BoundsTreeTestView; 37 38 // The set of Views that collided with the query rectangle provided to the 39 // RTree data structure, or NULL if one is not available. 40 scoped_ptr<base::hash_set<intptr_t> > cull_set_; 41 42 DISALLOW_COPY_AND_ASSIGN(CullSet); 43}; 44 45} // namespace views 46 47#endif // UI_VIEWS_CULL_SET_H_ 48