cc/debug/paint_time_counter.h

   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.h"
  11 #include "cc/debug/ring_buffer.h"
  12
  13 namespace cc {
  14
  15 // Maintains a history of paint times for each frame
  16 class 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_