src/cc/debug/paint_time_counter.cc

   1 // Copyright 2012 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 #include "cc/debug/paint_time_counter.h"
   6
   7 namespace cc {
   8
   9 // static
  10 scoped_ptr<PaintTimeCounter> PaintTimeCounter::Create() {
  11   return make_scoped_ptr(new PaintTimeCounter());
  12 }
  13
  14 PaintTimeCounter::PaintTimeCounter()
  15   : can_save_paint_time_delta_(false) {
  16 }
  17
  18 void PaintTimeCounter::SavePaintTime(const base::TimeDelta& total_paint_time) {
  19   if (can_save_paint_time_delta_) {
  20     base::TimeDelta paint_time = total_paint_time - last_total_paint_time_;
  21     ring_buffer_.SaveToBuffer(paint_time);
  22   }
  23
  24   last_total_paint_time_ = total_paint_time;
  25   can_save_paint_time_delta_ = true;
  26 }
  27
  28 void PaintTimeCounter::GetMinAndMaxPaintTime(base::TimeDelta* min,
  29                                              base::TimeDelta* max) const {
  30   *min = base::TimeDelta::FromDays(1);
  31   *max = base::TimeDelta();
  32
  33   for (RingBufferType::Iterator it = ring_buffer_.Begin(); it; ++it) {
  34     const base::TimeDelta paint_time = **it;
  35
  36     if (paint_time < *min)
  37       *min = paint_time;
  38     if (paint_time > *max)
  39       *max = paint_time;
  40   }
  41
  42   if (*min > *max)
  43     *min = *max;
  44 }
  45
  46 void PaintTimeCounter::ClearHistory() {
  47   ring_buffer_.Clear();
  48   can_save_paint_time_delta_ = false;
  49 }
  50
  51 }  // namespace cc