services/surfaceflinger/Scheduler/PhaseOffsets.cpp - android_frameworks_native - Gitiles

 /*
  * Copyright 2019 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "PhaseOffsets.h"

 #include <cutils/properties.h>

 #include <optional>

 #include "SurfaceFlingerProperties.h"

 namespace {

 std::optional<nsecs_t> getProperty(const char* name) {
     char value[PROPERTY_VALUE_MAX];
     property_get(name, value, "-1");
     if (const int i = atoi(value); i != -1) return i;
     return std::nullopt;
 }

 bool fpsEqualsWithMargin(float fpsA, float fpsB) {
     static constexpr float MARGIN = 0.01f;
     return std::abs(fpsA - fpsB) <= MARGIN;
 }

 std::vector<float> getRefreshRatesFromConfigs(
         const android::scheduler::RefreshRateConfigs& refreshRateConfigs) {
     const auto& allRefreshRates = refreshRateConfigs.getAllRefreshRates();
     std::vector<float> refreshRates;
     refreshRates.reserve(allRefreshRates.size());

     for (const auto& [ignored, refreshRate] : allRefreshRates) {
         refreshRates.emplace_back(refreshRate->getFps());
     }

     return refreshRates;
 }

 } // namespace

 namespace android::scheduler {

 PhaseConfiguration::~PhaseConfiguration() = default;

 namespace impl {

 PhaseOffsets::PhaseOffsets(const scheduler::RefreshRateConfigs& refreshRateConfigs)
       : PhaseOffsets(getRefreshRatesFromConfigs(refreshRateConfigs),
                      refreshRateConfigs.getCurrentRefreshRate().getFps(),
                      // Below defines the threshold when an offset is considered to be negative,
                      // i.e. targeting for the N+2 vsync instead of N+1. This means that: For offset
                      // < threshold, SF wake up (vsync_duration - offset) before HW vsync. For
                      // offset >= threshold, SF wake up (2 * vsync_duration - offset) before HW
                      // vsync.
                      getProperty("debug.sf.phase_offset_threshold_for_next_vsync_ns")
                              .value_or(std::numeric_limits<nsecs_t>::max())) {}

 PhaseOffsets::PhaseOffsets(const std::vector<float>& refreshRates, float currentFps,
                            nsecs_t thresholdForNextVsync)
       : mThresholdForNextVsync(thresholdForNextVsync),
         mOffsets(initializeOffsets(refreshRates)),
         mRefreshRateFps(currentFps) {}

 void PhaseOffsets::dump(std::string& result) const {
     const auto [early, earlyGl, late] = getCurrentOffsets();
     using base::StringAppendF;
     StringAppendF(&result,
                   "           app phase: %9" PRId64 " ns\t         SF phase: %9" PRId64 " ns\n"
                   "     early app phase: %9" PRId64 " ns\t   early SF phase: %9" PRId64 " ns\n"
                   "  GL early app phase: %9" PRId64 " ns\tGL early SF phase: %9" PRId64 " ns\n"
                   "next VSYNC threshold: %9" PRId64 " ns\n",
                   late.app, late.sf, early.app, early.sf, earlyGl.app, earlyGl.sf,
                   mThresholdForNextVsync);
 }

 std::unordered_map<float, PhaseOffsets::Offsets> PhaseOffsets::initializeOffsets(
         const std::vector<float>& refreshRates) const {
     std::unordered_map<float, Offsets> offsets;

     for (const auto& refreshRate : refreshRates) {
         offsets.emplace(refreshRate,
                         getPhaseOffsets(refreshRate, static_cast<nsecs_t>(1e9f / refreshRate)));
     }
     return offsets;
 }

 PhaseOffsets::Offsets PhaseOffsets::getPhaseOffsets(float fps, nsecs_t vsyncPeriod) const {
     if (fps > 65.0f) {
         return getHighFpsOffsets(vsyncPeriod);
     } else {
         return getDefaultOffsets(vsyncPeriod);
     }
 }

 PhaseOffsets::Offsets PhaseOffsets::getDefaultOffsets(nsecs_t vsyncDuration) const {
     const int64_t vsyncPhaseOffsetNs = sysprop::vsync_event_phase_offset_ns(1000000);
     const int64_t sfVsyncPhaseOffsetNs = sysprop::vsync_sf_event_phase_offset_ns(1000000);

     const auto earlySfOffsetNs = getProperty("debug.sf.early_phase_offset_ns");
     const auto earlyGlSfOffsetNs = getProperty("debug.sf.early_gl_phase_offset_ns");
     const auto earlyAppOffsetNs = getProperty("debug.sf.early_app_phase_offset_ns");
     const auto earlyGlAppOffsetNs = getProperty("debug.sf.early_gl_app_phase_offset_ns");

     return {
             {
                     earlySfOffsetNs.value_or(sfVsyncPhaseOffsetNs) < mThresholdForNextVsync
                             ? earlySfOffsetNs.value_or(sfVsyncPhaseOffsetNs)
                             : earlySfOffsetNs.value_or(sfVsyncPhaseOffsetNs) - vsyncDuration,

                     earlyAppOffsetNs.value_or(vsyncPhaseOffsetNs),
             },
             {
                     earlyGlSfOffsetNs.value_or(sfVsyncPhaseOffsetNs) < mThresholdForNextVsync
                             ? earlyGlSfOffsetNs.value_or(sfVsyncPhaseOffsetNs)
                             : earlyGlSfOffsetNs.value_or(sfVsyncPhaseOffsetNs) - vsyncDuration,

                     earlyGlAppOffsetNs.value_or(vsyncPhaseOffsetNs),
             },
             {
                     sfVsyncPhaseOffsetNs < mThresholdForNextVsync
                             ? sfVsyncPhaseOffsetNs
                             : sfVsyncPhaseOffsetNs - vsyncDuration,

                     vsyncPhaseOffsetNs,
             },
     };
 }

 PhaseOffsets::Offsets PhaseOffsets::getHighFpsOffsets(nsecs_t vsyncDuration) const {
     const auto highFpsLateAppOffsetNs =
             getProperty("debug.sf.high_fps_late_app_phase_offset_ns").value_or(2000000);
     const auto highFpsLateSfOffsetNs =
             getProperty("debug.sf.high_fps_late_sf_phase_offset_ns").value_or(1000000);

     const auto highFpsEarlySfOffsetNs = getProperty("debug.sf.high_fps_early_phase_offset_ns");
     const auto highFpsEarlyGlSfOffsetNs = getProperty("debug.sf.high_fps_early_gl_phase_offset_ns");
     const auto highFpsEarlyAppOffsetNs = getProperty("debug.sf.high_fps_early_app_phase_offset_ns");
     const auto highFpsEarlyGlAppOffsetNs =
             getProperty("debug.sf.high_fps_early_gl_app_phase_offset_ns");

     return {
             {
                     highFpsEarlySfOffsetNs.value_or(highFpsLateSfOffsetNs) < mThresholdForNextVsync
                             ? highFpsEarlySfOffsetNs.value_or(highFpsLateSfOffsetNs)
                             : highFpsEarlySfOffsetNs.value_or(highFpsLateSfOffsetNs) -
                                     vsyncDuration,

                     highFpsEarlyAppOffsetNs.value_or(highFpsLateAppOffsetNs),
             },
             {
                     highFpsEarlyGlSfOffsetNs.value_or(highFpsLateSfOffsetNs) <
                                     mThresholdForNextVsync
                             ? highFpsEarlyGlSfOffsetNs.value_or(highFpsLateSfOffsetNs)
                             : highFpsEarlyGlSfOffsetNs.value_or(highFpsLateSfOffsetNs) -
                                     vsyncDuration,

                     highFpsEarlyGlAppOffsetNs.value_or(highFpsLateAppOffsetNs),
             },
             {
                     highFpsLateSfOffsetNs < mThresholdForNextVsync
                             ? highFpsLateSfOffsetNs
                             : highFpsLateSfOffsetNs - vsyncDuration,

                     highFpsLateAppOffsetNs,
             },
     };
 }

 PhaseOffsets::Offsets PhaseOffsets::getOffsetsForRefreshRate(float fps) const {
     const auto iter = std::find_if(mOffsets.begin(), mOffsets.end(),
                                    [&fps](const std::pair<float, Offsets>& candidateFps) {
                                        return fpsEqualsWithMargin(fps, candidateFps.first);
                                    });

     if (iter != mOffsets.end()) {
         return iter->second;
     }

     // Unknown refresh rate. This might happen if we get a hotplug event for an external display.
     // In this case just construct the offset.
     ALOGW("Can't find offset for %.2f fps", fps);
     return getPhaseOffsets(fps, static_cast<nsecs_t>(1e9f / fps));
 }

 static void validateSysprops() {
     const auto validatePropertyBool = [](const char* prop) {
         LOG_ALWAYS_FATAL_IF(!property_get_bool(prop, false), "%s is false", prop);
     };

     validatePropertyBool("debug.sf.use_phase_offsets_as_durations");

     LOG_ALWAYS_FATAL_IF(sysprop::vsync_event_phase_offset_ns(-1) != -1,
                         "ro.surface_flinger.vsync_event_phase_offset_ns is set but expecting "
                         "duration");

     LOG_ALWAYS_FATAL_IF(sysprop::vsync_sf_event_phase_offset_ns(-1) != -1,
                         "ro.surface_flinger.vsync_sf_event_phase_offset_ns is set but expecting "
                         "duration");

     const auto validateProperty = [](const char* prop) {
         LOG_ALWAYS_FATAL_IF(getProperty(prop).has_value(),
                             "%s is set to %" PRId64 " but expecting duration", prop,
                             getProperty(prop).value_or(-1));
     };

     validateProperty("debug.sf.early_phase_offset_ns");
     validateProperty("debug.sf.early_gl_phase_offset_ns");
     validateProperty("debug.sf.early_app_phase_offset_ns");
     validateProperty("debug.sf.early_gl_app_phase_offset_ns");
     validateProperty("debug.sf.high_fps_late_app_phase_offset_ns");
     validateProperty("debug.sf.high_fps_late_sf_phase_offset_ns");
     validateProperty("debug.sf.high_fps_early_phase_offset_ns");
     validateProperty("debug.sf.high_fps_early_gl_phase_offset_ns");
     validateProperty("debug.sf.high_fps_early_app_phase_offset_ns");
     validateProperty("debug.sf.high_fps_early_gl_app_phase_offset_ns");
 }

 static nsecs_t sfDurationToOffset(nsecs_t sfDuration, nsecs_t vsyncDuration) {
     return sfDuration == -1 ? 1'000'000 : vsyncDuration - sfDuration % vsyncDuration;
 }

 static nsecs_t appDurationToOffset(nsecs_t appDuration, nsecs_t sfDuration, nsecs_t vsyncDuration) {
     return sfDuration == -1 ? 1'000'000
                             : vsyncDuration - (appDuration + sfDuration) % vsyncDuration;
 }

 PhaseDurations::Offsets PhaseDurations::constructOffsets(nsecs_t vsyncDuration) const {
     return Offsets{
             {
                     mSfEarlyDuration < vsyncDuration
                             ? sfDurationToOffset(mSfEarlyDuration, vsyncDuration)
                             : sfDurationToOffset(mSfEarlyDuration, vsyncDuration) - vsyncDuration,

                     appDurationToOffset(mAppEarlyDuration, mSfEarlyDuration, vsyncDuration),
             },
             {
                     mSfEarlyGlDuration < vsyncDuration
                             ? sfDurationToOffset(mSfEarlyGlDuration, vsyncDuration)
                             : sfDurationToOffset(mSfEarlyGlDuration, vsyncDuration) - vsyncDuration,

                     appDurationToOffset(mAppEarlyGlDuration, mSfEarlyGlDuration, vsyncDuration),
             },
             {
                     mSfDuration < vsyncDuration
                             ? sfDurationToOffset(mSfDuration, vsyncDuration)
                             : sfDurationToOffset(mSfDuration, vsyncDuration) - vsyncDuration,

                     appDurationToOffset(mAppDuration, mSfDuration, vsyncDuration),
             },
     };
 }

 std::unordered_map<float, PhaseDurations::Offsets> PhaseDurations::initializeOffsets(
         const std::vector<float>& refreshRates) const {
     std::unordered_map<float, Offsets> offsets;

     for (const auto fps : refreshRates) {
         offsets.emplace(fps, constructOffsets(static_cast<nsecs_t>(1e9f / fps)));
     }
     return offsets;
 }

 PhaseDurations::PhaseDurations(const scheduler::RefreshRateConfigs& refreshRateConfigs)
       : PhaseDurations(getRefreshRatesFromConfigs(refreshRateConfigs),
                        refreshRateConfigs.getCurrentRefreshRate().getFps(),
                        getProperty("debug.sf.late.sf.duration").value_or(-1),
                        getProperty("debug.sf.late.app.duration").value_or(-1),
                        getProperty("debug.sf.early.sf.duration").value_or(mSfDuration),
                        getProperty("debug.sf.early.app.duration").value_or(mAppDuration),
                        getProperty("debug.sf.earlyGl.sf.duration").value_or(mSfDuration),
                        getProperty("debug.sf.earlyGl.app.duration").value_or(mAppDuration)) {
     validateSysprops();
 }

 PhaseDurations::PhaseDurations(const std::vector<float>& refreshRates, float currentFps,
                                nsecs_t sfDuration, nsecs_t appDuration, nsecs_t sfEarlyDuration,
                                nsecs_t appEarlyDuration, nsecs_t sfEarlyGlDuration,
                                nsecs_t appEarlyGlDuration)
       : mSfDuration(sfDuration),
         mAppDuration(appDuration),
         mSfEarlyDuration(sfEarlyDuration),
         mAppEarlyDuration(appEarlyDuration),
         mSfEarlyGlDuration(sfEarlyGlDuration),
         mAppEarlyGlDuration(appEarlyGlDuration),
         mOffsets(initializeOffsets(refreshRates)),
         mRefreshRateFps(currentFps) {}

 PhaseOffsets::Offsets PhaseDurations::getOffsetsForRefreshRate(float fps) const {
     const auto iter = std::find_if(mOffsets.begin(), mOffsets.end(), [=](const auto& candidateFps) {
         return fpsEqualsWithMargin(fps, candidateFps.first);
     });

     if (iter != mOffsets.end()) {
         return iter->second;
     }

     // Unknown refresh rate. This might happen if we get a hotplug event for an external display.
     // In this case just construct the offset.
     ALOGW("Can't find offset for %.2f fps", fps);
     return constructOffsets(static_cast<nsecs_t>(1e9f / fps));
 }

 void PhaseDurations::dump(std::string& result) const {
     const auto [early, earlyGl, late] = getCurrentOffsets();
     using base::StringAppendF;
     StringAppendF(&result,
                   "           app phase:    %9" PRId64 " ns\t         SF phase:    %9" PRId64
                   " ns\n"
                   "           app duration: %9" PRId64 " ns\t         SF duration: %9" PRId64
                   " ns\n"
                   "     early app phase:    %9" PRId64 " ns\t   early SF phase:    %9" PRId64
                   " ns\n"
                   "     early app duration: %9" PRId64 " ns\t   early SF duration: %9" PRId64
                   " ns\n"
                   "  GL early app phase:    %9" PRId64 " ns\tGL early SF phase:    %9" PRId64
                   " ns\n"
                   "  GL early app duration: %9" PRId64 " ns\tGL early SF duration: %9" PRId64
                   " ns\n",
                   late.app,

                   late.sf,

                   mAppDuration, mSfDuration,

                   early.app, early.sf,

                   mAppEarlyDuration, mSfEarlyDuration,

                   earlyGl.app,

                   earlyGl.sf,

                   mAppEarlyGlDuration, mSfEarlyGlDuration);
 }

 } // namespace impl
 } // namespace android::scheduler
	/*
	* Copyright 2019 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "PhaseOffsets.h"

	#include <cutils/properties.h>

	#include <optional>

	#include "SurfaceFlingerProperties.h"

	namespace {

	std::optional<nsecs_t> getProperty(const char* name) {
	char value[PROPERTY_VALUE_MAX];
	property_get(name, value, "-1");
	if (const int i = atoi(value); i != -1) return i;
	return std::nullopt;
	}

	bool fpsEqualsWithMargin(float fpsA, float fpsB) {
	static constexpr float MARGIN = 0.01f;
	return std::abs(fpsA - fpsB) <= MARGIN;
	}

	std::vector<float> getRefreshRatesFromConfigs(
	const android::scheduler::RefreshRateConfigs& refreshRateConfigs) {
	const auto& allRefreshRates = refreshRateConfigs.getAllRefreshRates();
	std::vector<float> refreshRates;
	refreshRates.reserve(allRefreshRates.size());

	for (const auto& [ignored, refreshRate] : allRefreshRates) {
	refreshRates.emplace_back(refreshRate->getFps());
	}

	return refreshRates;
	}

	} // namespace

	namespace android::scheduler {

	PhaseConfiguration::~PhaseConfiguration() = default;

	namespace impl {

	PhaseOffsets::PhaseOffsets(const scheduler::RefreshRateConfigs& refreshRateConfigs)
	: PhaseOffsets(getRefreshRatesFromConfigs(refreshRateConfigs),
	refreshRateConfigs.getCurrentRefreshRate().getFps(),
	// Below defines the threshold when an offset is considered to be negative,
	// i.e. targeting for the N+2 vsync instead of N+1. This means that: For offset
	// < threshold, SF wake up (vsync_duration - offset) before HW vsync. For
	// offset >= threshold, SF wake up (2 * vsync_duration - offset) before HW
	// vsync.
	getProperty("debug.sf.phase_offset_threshold_for_next_vsync_ns")
	.value_or(std::numeric_limits<nsecs_t>::max())) {}

	PhaseOffsets::PhaseOffsets(const std::vector<float>& refreshRates, float currentFps,
	nsecs_t thresholdForNextVsync)
	: mThresholdForNextVsync(thresholdForNextVsync),
	mOffsets(initializeOffsets(refreshRates)),
	mRefreshRateFps(currentFps) {}

	void PhaseOffsets::dump(std::string& result) const {
	const auto [early, earlyGl, late] = getCurrentOffsets();
	using base::StringAppendF;
	StringAppendF(&result,
	" app phase: %9" PRId64 " ns\t SF phase: %9" PRId64 " ns\n"
	" early app phase: %9" PRId64 " ns\t early SF phase: %9" PRId64 " ns\n"
	" GL early app phase: %9" PRId64 " ns\tGL early SF phase: %9" PRId64 " ns\n"
	"next VSYNC threshold: %9" PRId64 " ns\n",
	late.app, late.sf, early.app, early.sf, earlyGl.app, earlyGl.sf,
	mThresholdForNextVsync);
	}

	std::unordered_map<float, PhaseOffsets::Offsets> PhaseOffsets::initializeOffsets(
	const std::vector<float>& refreshRates) const {
	std::unordered_map<float, Offsets> offsets;

	for (const auto& refreshRate : refreshRates) {
	offsets.emplace(refreshRate,
	getPhaseOffsets(refreshRate, static_cast<nsecs_t>(1e9f / refreshRate)));
	}
	return offsets;
	}

	PhaseOffsets::Offsets PhaseOffsets::getPhaseOffsets(float fps, nsecs_t vsyncPeriod) const {
	if (fps > 65.0f) {
	return getHighFpsOffsets(vsyncPeriod);
	} else {
	return getDefaultOffsets(vsyncPeriod);
	}
	}

	PhaseOffsets::Offsets PhaseOffsets::getDefaultOffsets(nsecs_t vsyncDuration) const {
	const int64_t vsyncPhaseOffsetNs = sysprop::vsync_event_phase_offset_ns(1000000);
	const int64_t sfVsyncPhaseOffsetNs = sysprop::vsync_sf_event_phase_offset_ns(1000000);

	const auto earlySfOffsetNs = getProperty("debug.sf.early_phase_offset_ns");
	const auto earlyGlSfOffsetNs = getProperty("debug.sf.early_gl_phase_offset_ns");
	const auto earlyAppOffsetNs = getProperty("debug.sf.early_app_phase_offset_ns");
	const auto earlyGlAppOffsetNs = getProperty("debug.sf.early_gl_app_phase_offset_ns");

	return {
	{
	earlySfOffsetNs.value_or(sfVsyncPhaseOffsetNs) < mThresholdForNextVsync
	? earlySfOffsetNs.value_or(sfVsyncPhaseOffsetNs)
	: earlySfOffsetNs.value_or(sfVsyncPhaseOffsetNs) - vsyncDuration,

	earlyAppOffsetNs.value_or(vsyncPhaseOffsetNs),
	},
	{
	earlyGlSfOffsetNs.value_or(sfVsyncPhaseOffsetNs) < mThresholdForNextVsync
	? earlyGlSfOffsetNs.value_or(sfVsyncPhaseOffsetNs)
	: earlyGlSfOffsetNs.value_or(sfVsyncPhaseOffsetNs) - vsyncDuration,

	earlyGlAppOffsetNs.value_or(vsyncPhaseOffsetNs),
	},
	{
	sfVsyncPhaseOffsetNs < mThresholdForNextVsync
	? sfVsyncPhaseOffsetNs
	: sfVsyncPhaseOffsetNs - vsyncDuration,

	vsyncPhaseOffsetNs,
	},
	};
	}

	PhaseOffsets::Offsets PhaseOffsets::getHighFpsOffsets(nsecs_t vsyncDuration) const {
	const auto highFpsLateAppOffsetNs =
	getProperty("debug.sf.high_fps_late_app_phase_offset_ns").value_or(2000000);
	const auto highFpsLateSfOffsetNs =
	getProperty("debug.sf.high_fps_late_sf_phase_offset_ns").value_or(1000000);

	const auto highFpsEarlySfOffsetNs = getProperty("debug.sf.high_fps_early_phase_offset_ns");
	const auto highFpsEarlyGlSfOffsetNs = getProperty("debug.sf.high_fps_early_gl_phase_offset_ns");
	const auto highFpsEarlyAppOffsetNs = getProperty("debug.sf.high_fps_early_app_phase_offset_ns");
	const auto highFpsEarlyGlAppOffsetNs =
	getProperty("debug.sf.high_fps_early_gl_app_phase_offset_ns");

	return {
	{
	highFpsEarlySfOffsetNs.value_or(highFpsLateSfOffsetNs) < mThresholdForNextVsync
	? highFpsEarlySfOffsetNs.value_or(highFpsLateSfOffsetNs)
	: highFpsEarlySfOffsetNs.value_or(highFpsLateSfOffsetNs) -
	vsyncDuration,

	highFpsEarlyAppOffsetNs.value_or(highFpsLateAppOffsetNs),
	},
	{
	highFpsEarlyGlSfOffsetNs.value_or(highFpsLateSfOffsetNs) <
	mThresholdForNextVsync
	? highFpsEarlyGlSfOffsetNs.value_or(highFpsLateSfOffsetNs)
	: highFpsEarlyGlSfOffsetNs.value_or(highFpsLateSfOffsetNs) -
	vsyncDuration,

	highFpsEarlyGlAppOffsetNs.value_or(highFpsLateAppOffsetNs),
	},
	{
	highFpsLateSfOffsetNs < mThresholdForNextVsync
	? highFpsLateSfOffsetNs
	: highFpsLateSfOffsetNs - vsyncDuration,

	highFpsLateAppOffsetNs,
	},
	};
	}

	PhaseOffsets::Offsets PhaseOffsets::getOffsetsForRefreshRate(float fps) const {
	const auto iter = std::find_if(mOffsets.begin(), mOffsets.end(),
	[&fps](const std::pair<float, Offsets>& candidateFps) {
	return fpsEqualsWithMargin(fps, candidateFps.first);
	});

	if (iter != mOffsets.end()) {
	return iter->second;
	}

	// Unknown refresh rate. This might happen if we get a hotplug event for an external display.
	// In this case just construct the offset.
	ALOGW("Can't find offset for %.2f fps", fps);
	return getPhaseOffsets(fps, static_cast<nsecs_t>(1e9f / fps));
	}

	static void validateSysprops() {
	const auto validatePropertyBool = [](const char* prop) {
	LOG_ALWAYS_FATAL_IF(!property_get_bool(prop, false), "%s is false", prop);
	};

	validatePropertyBool("debug.sf.use_phase_offsets_as_durations");

	LOG_ALWAYS_FATAL_IF(sysprop::vsync_event_phase_offset_ns(-1) != -1,
	"ro.surface_flinger.vsync_event_phase_offset_ns is set but expecting "
	"duration");

	LOG_ALWAYS_FATAL_IF(sysprop::vsync_sf_event_phase_offset_ns(-1) != -1,
	"ro.surface_flinger.vsync_sf_event_phase_offset_ns is set but expecting "
	"duration");

	const auto validateProperty = [](const char* prop) {
	LOG_ALWAYS_FATAL_IF(getProperty(prop).has_value(),
	"%s is set to %" PRId64 " but expecting duration", prop,
	getProperty(prop).value_or(-1));
	};

	validateProperty("debug.sf.early_phase_offset_ns");
	validateProperty("debug.sf.early_gl_phase_offset_ns");
	validateProperty("debug.sf.early_app_phase_offset_ns");
	validateProperty("debug.sf.early_gl_app_phase_offset_ns");
	validateProperty("debug.sf.high_fps_late_app_phase_offset_ns");
	validateProperty("debug.sf.high_fps_late_sf_phase_offset_ns");
	validateProperty("debug.sf.high_fps_early_phase_offset_ns");
	validateProperty("debug.sf.high_fps_early_gl_phase_offset_ns");
	validateProperty("debug.sf.high_fps_early_app_phase_offset_ns");
	validateProperty("debug.sf.high_fps_early_gl_app_phase_offset_ns");
	}

	static nsecs_t sfDurationToOffset(nsecs_t sfDuration, nsecs_t vsyncDuration) {
	return sfDuration == -1 ? 1'000'000 : vsyncDuration - sfDuration % vsyncDuration;
	}

	static nsecs_t appDurationToOffset(nsecs_t appDuration, nsecs_t sfDuration, nsecs_t vsyncDuration) {
	return sfDuration == -1 ? 1'000'000
	: vsyncDuration - (appDuration + sfDuration) % vsyncDuration;
	}

	PhaseDurations::Offsets PhaseDurations::constructOffsets(nsecs_t vsyncDuration) const {
	return Offsets{
	{
	mSfEarlyDuration < vsyncDuration
	? sfDurationToOffset(mSfEarlyDuration, vsyncDuration)
	: sfDurationToOffset(mSfEarlyDuration, vsyncDuration) - vsyncDuration,

	appDurationToOffset(mAppEarlyDuration, mSfEarlyDuration, vsyncDuration),
	},
	{
	mSfEarlyGlDuration < vsyncDuration
	? sfDurationToOffset(mSfEarlyGlDuration, vsyncDuration)
	: sfDurationToOffset(mSfEarlyGlDuration, vsyncDuration) - vsyncDuration,

	appDurationToOffset(mAppEarlyGlDuration, mSfEarlyGlDuration, vsyncDuration),
	},
	{
	mSfDuration < vsyncDuration
	? sfDurationToOffset(mSfDuration, vsyncDuration)
	: sfDurationToOffset(mSfDuration, vsyncDuration) - vsyncDuration,

	appDurationToOffset(mAppDuration, mSfDuration, vsyncDuration),
	},
	};
	}

	std::unordered_map<float, PhaseDurations::Offsets> PhaseDurations::initializeOffsets(
	const std::vector<float>& refreshRates) const {
	std::unordered_map<float, Offsets> offsets;

	for (const auto fps : refreshRates) {
	offsets.emplace(fps, constructOffsets(static_cast<nsecs_t>(1e9f / fps)));
	}
	return offsets;
	}

	PhaseDurations::PhaseDurations(const scheduler::RefreshRateConfigs& refreshRateConfigs)
	: PhaseDurations(getRefreshRatesFromConfigs(refreshRateConfigs),
	refreshRateConfigs.getCurrentRefreshRate().getFps(),
	getProperty("debug.sf.late.sf.duration").value_or(-1),
	getProperty("debug.sf.late.app.duration").value_or(-1),
	getProperty("debug.sf.early.sf.duration").value_or(mSfDuration),
	getProperty("debug.sf.early.app.duration").value_or(mAppDuration),
	getProperty("debug.sf.earlyGl.sf.duration").value_or(mSfDuration),
	getProperty("debug.sf.earlyGl.app.duration").value_or(mAppDuration)) {
	validateSysprops();
	}

	PhaseDurations::PhaseDurations(const std::vector<float>& refreshRates, float currentFps,
	nsecs_t sfDuration, nsecs_t appDuration, nsecs_t sfEarlyDuration,
	nsecs_t appEarlyDuration, nsecs_t sfEarlyGlDuration,
	nsecs_t appEarlyGlDuration)
	: mSfDuration(sfDuration),
	mAppDuration(appDuration),
	mSfEarlyDuration(sfEarlyDuration),
	mAppEarlyDuration(appEarlyDuration),
	mSfEarlyGlDuration(sfEarlyGlDuration),
	mAppEarlyGlDuration(appEarlyGlDuration),
	mOffsets(initializeOffsets(refreshRates)),
	mRefreshRateFps(currentFps) {}

	PhaseOffsets::Offsets PhaseDurations::getOffsetsForRefreshRate(float fps) const {
	const auto iter = std::find_if(mOffsets.begin(), mOffsets.end(), [=](const auto& candidateFps) {
	return fpsEqualsWithMargin(fps, candidateFps.first);
	});

	if (iter != mOffsets.end()) {
	return iter->second;
	}

	// Unknown refresh rate. This might happen if we get a hotplug event for an external display.
	// In this case just construct the offset.
	ALOGW("Can't find offset for %.2f fps", fps);
	return constructOffsets(static_cast<nsecs_t>(1e9f / fps));
	}

	void PhaseDurations::dump(std::string& result) const {
	const auto [early, earlyGl, late] = getCurrentOffsets();
	using base::StringAppendF;
	StringAppendF(&result,
	" app phase: %9" PRId64 " ns\t SF phase: %9" PRId64
	" ns\n"
	" app duration: %9" PRId64 " ns\t SF duration: %9" PRId64
	" ns\n"
	" early app phase: %9" PRId64 " ns\t early SF phase: %9" PRId64
	" ns\n"
	" early app duration: %9" PRId64 " ns\t early SF duration: %9" PRId64
	" ns\n"
	" GL early app phase: %9" PRId64 " ns\tGL early SF phase: %9" PRId64
	" ns\n"
	" GL early app duration: %9" PRId64 " ns\tGL early SF duration: %9" PRId64
	" ns\n",
	late.app,

	late.sf,

	mAppDuration, mSfDuration,

	early.app, early.sf,

	mAppEarlyDuration, mSfEarlyDuration,

	earlyGl.app,

	earlyGl.sf,

	mAppEarlyGlDuration, mSfEarlyGlDuration);
	}

	} // namespace impl
	} // namespace android::scheduler