cc/trees/proxy_timing_history.cc

   1 // Copyright 2014 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/trees/proxy_timing_history.h"
   6
   7 const size_t kDurationHistorySize = 60;
   8 const double kCommitAndActivationDurationEstimationPercentile = 50.0;
   9 const double kDrawDurationEstimationPercentile = 100.0;
  10 const int kDrawDurationEstimatePaddingInMicroseconds = 0;
  11
  12 namespace cc {
  13
  14 ProxyTimingHistory::ProxyTimingHistory()
  15     : draw_duration_history_(kDurationHistorySize),
  16       begin_main_frame_to_commit_duration_history_(kDurationHistorySize),
  17       commit_to_activate_duration_history_(kDurationHistorySize) {}
  18
  19 ProxyTimingHistory::~ProxyTimingHistory() {}
  20
  21 base::TimeDelta ProxyTimingHistory::DrawDurationEstimate() const {
  22   base::TimeDelta historical_estimate =
  23       draw_duration_history_.Percentile(kDrawDurationEstimationPercentile);
  24   base::TimeDelta padding = base::TimeDelta::FromMicroseconds(
  25       kDrawDurationEstimatePaddingInMicroseconds);
  26   return historical_estimate + padding;
  27 }
  28
  29 base::TimeDelta ProxyTimingHistory::BeginMainFrameToCommitDurationEstimate()
  30     const {
  31   return begin_main_frame_to_commit_duration_history_.Percentile(
  32       kCommitAndActivationDurationEstimationPercentile);
  33 }
  34
  35 base::TimeDelta ProxyTimingHistory::CommitToActivateDurationEstimate() const {
  36   return commit_to_activate_duration_history_.Percentile(
  37       kCommitAndActivationDurationEstimationPercentile);
  38 }
  39
  40 void ProxyTimingHistory::DidBeginMainFrame() {
  41   begin_main_frame_sent_time_ = base::TimeTicks::HighResNow();
  42 }
  43
  44 void ProxyTimingHistory::DidCommit() {
  45   commit_complete_time_ = base::TimeTicks::HighResNow();
  46   begin_main_frame_to_commit_duration_history_.InsertSample(
  47       commit_complete_time_ - begin_main_frame_sent_time_);
  48 }
  49
  50 void ProxyTimingHistory::DidActivateSyncTree() {
  51   commit_to_activate_duration_history_.InsertSample(
  52       base::TimeTicks::HighResNow() - commit_complete_time_);
  53 }
  54
  55 void ProxyTimingHistory::DidStartDrawing() {
  56   start_draw_time_ = base::TimeTicks::HighResNow();
  57 }
  58
  59 base::TimeDelta ProxyTimingHistory::DidFinishDrawing() {
  60   base::TimeDelta draw_duration =
  61       base::TimeTicks::HighResNow() - start_draw_time_;
  62   draw_duration_history_.InsertSample(draw_duration);
  63   return draw_duration;
  64 }
  65
  66 }  // namespace cc