File indexing completed on 2024-05-19 05:31:36
0001 /* 0002 SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org> 0003 0004 SPDX-License-Identifier: GPL-2.0-or-later 0005 */ 0006 0007 #include "renderjournal.h" 0008 0009 using namespace std::chrono_literals; 0010 0011 namespace KWin 0012 { 0013 0014 RenderJournal::RenderJournal() 0015 { 0016 } 0017 0018 static std::chrono::nanoseconds mix(std::chrono::nanoseconds duration1, std::chrono::nanoseconds duration2, double ratio) 0019 { 0020 return std::chrono::nanoseconds(int64_t(std::round(duration1.count() * ratio + duration2.count() * (1 - ratio)))); 0021 } 0022 0023 void RenderJournal::add(std::chrono::nanoseconds renderTime, std::chrono::nanoseconds presentationTimestamp) 0024 { 0025 const auto timeDifference = m_lastAdd ? presentationTimestamp - *m_lastAdd : 10s; 0026 m_lastAdd = presentationTimestamp; 0027 0028 static constexpr std::chrono::nanoseconds varianceTimeConstant = 3s; 0029 const double varianceRatio = std::clamp(timeDifference.count() / double(varianceTimeConstant.count()), 0.1, 1.0); 0030 const auto renderTimeDiff = std::max(renderTime - m_result, 0ns); 0031 m_variance = std::max(mix(renderTimeDiff, m_variance, varianceRatio), renderTimeDiff); 0032 0033 static constexpr std::chrono::nanoseconds timeConstant = 500ms; 0034 const double ratio = std::clamp(timeDifference.count() / double(timeConstant.count()), 0.1, 1.0); 0035 m_result = mix(renderTime, m_result, ratio); 0036 } 0037 0038 std::chrono::nanoseconds RenderJournal::result() const 0039 { 0040 return m_result + m_variance * 2; 0041 } 0042 0043 } // namespace KWin