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_RESOURCES_MEMORY_HISTORY_H_
6#define CC_RESOURCES_MEMORY_HISTORY_H_
7
8#include "base/basictypes.h"
9#include "base/memory/scoped_ptr.h"
10#include "base/time/time.h"
11#include "cc/debug/ring_buffer.h"
12
13namespace cc {
14
15// Maintains a history of memory for each frame.
16class MemoryHistory {
17 public:
18  static scoped_ptr<MemoryHistory> Create();
19
20  size_t HistorySize() const { return ring_buffer_.BufferSize(); }
21
22  struct Entry {
23    Entry()
24        : total_budget_in_bytes(0),
25          bytes_allocated(0),
26          bytes_unreleasable(0),
27          bytes_over(0) {}
28
29    size_t total_budget_in_bytes;
30    size_t bytes_allocated;
31    size_t bytes_unreleasable;
32    size_t bytes_over;
33    size_t bytes_total() const {
34      return bytes_allocated + bytes_unreleasable + bytes_over;
35    }
36  };
37
38  void SaveEntry(const Entry& entry);
39  void GetMinAndMax(size_t* min, size_t* max) const;
40
41  typedef RingBuffer<Entry, 80> RingBufferType;
42  RingBufferType::Iterator Begin() const { return ring_buffer_.Begin(); }
43  RingBufferType::Iterator End() const { return ring_buffer_.End(); }
44
45 private:
46  MemoryHistory();
47
48  RingBufferType ring_buffer_;
49
50  DISALLOW_COPY_AND_ASSIGN(MemoryHistory);
51};
52
53}  // namespace cc
54
55#endif  // CC_RESOURCES_MEMORY_HISTORY_H_
56