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 13 namespace views { 14 15 class 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. 20 class 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