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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_VIEWS_CULL_SET_H_
#define UI_VIEWS_CULL_SET_H_
#include "base/containers/hash_tables.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "ui/views/views_export.h"
namespace views {
class View;
// A CullSet defines a set of View pointers which have been possibly culled
// from painting or other bounds-checking operations. It wraps a set of
// pointers to views, or NULL if no such set is available.
class VIEWS_EXPORT CullSet {
public:
// Default constructor builds a CullSet that will always return true for
// ShouldPaint().
CullSet();
~CullSet();
// Wraps a set of pointers to Views, as might be provided by
// gfx::RTree::Query(), that intersect the damage rect and therefore need
// to be painted. CullSet takes ownership of the provided pointer.
CullSet(scoped_ptr<base::hash_set<intptr_t> > cull_set);
// Returns true if |view| needs to be painted.
bool ShouldPaint(const View* view) const;
private:
friend class BoundsTreeTestView;
// The set of Views that collided with the query rectangle provided to the
// RTree data structure, or NULL if one is not available.
scoped_ptr<base::hash_set<intptr_t> > cull_set_;
DISALLOW_COPY_AND_ASSIGN(CullSet);
};
} // namespace views
#endif // UI_VIEWS_CULL_SET_H_
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