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