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      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::DidActivatePendingTree() {
     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
     67