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_DEBUG_PAINT_TIME_COUNTER_H_
6#define CC_DEBUG_PAINT_TIME_COUNTER_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 paint times for each frame
16class PaintTimeCounter {
17 public:
18  static scoped_ptr<PaintTimeCounter> Create();
19
20  size_t HistorySize() const { return ring_buffer_.BufferSize(); }
21
22  // n = 0 returns the oldest and
23  // n = PaintTimeHistorySize() - 1 the most recent paint time.
24  base::TimeDelta GetPaintTimeOfRecentFrame(const size_t& n) const;
25
26  void SavePaintTime(const base::TimeDelta& total_paint_time);
27  void GetMinAndMaxPaintTime(base::TimeDelta* min, base::TimeDelta* max) const;
28
29  void ClearHistory();
30
31  typedef RingBuffer<base::TimeDelta, 200> RingBufferType;
32  RingBufferType::Iterator Begin() const { return ring_buffer_.Begin(); }
33  RingBufferType::Iterator End() const { return ring_buffer_.End(); }
34
35 private:
36  PaintTimeCounter();
37
38  RingBufferType ring_buffer_;
39  base::TimeDelta last_total_paint_time_;
40  bool can_save_paint_time_delta_;
41
42  DISALLOW_COPY_AND_ASSIGN(PaintTimeCounter);
43};
44
45}  // namespace cc
46
47#endif  // CC_DEBUG_PAINT_TIME_COUNTER_H_
48