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Diffstat (limited to 'chromium/ui/views/cull_set.h')
-rw-r--r-- | chromium/ui/views/cull_set.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/chromium/ui/views/cull_set.h b/chromium/ui/views/cull_set.h new file mode 100644 index 00000000000..03f7cff86ee --- /dev/null +++ b/chromium/ui/views/cull_set.h @@ -0,0 +1,47 @@ +// 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_ |