services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp - LeafOS-Project/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.
  */

 // TODO(b/129481165): remove the #pragma below and fix conversion issues
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wconversion"

 #undef LOG_TAG
 #define LOG_TAG "LayerHistoryTest"

 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 #include <log/log.h>

 #include "Scheduler/LayerHistory.h"
 #include "Scheduler/LayerInfo.h"
 #include "TestableScheduler.h"
 #include "TestableSurfaceFlinger.h"
 #include "mock/MockLayer.h"

 using testing::_;
 using testing::Return;

 namespace android::scheduler {

 class LayerHistoryTest : public testing::Test {
 protected:
     static constexpr auto PRESENT_TIME_HISTORY_SIZE = LayerInfo::PresentTimeHistory::HISTORY_SIZE;
     static constexpr auto MAX_FREQUENT_LAYER_PERIOD_NS = LayerInfo::MAX_FREQUENT_LAYER_PERIOD_NS;

     static constexpr float LO_FPS = 30.f;
     static constexpr nsecs_t LO_FPS_PERIOD = 33'333'333;

     static constexpr float HI_FPS = 90.f;
     static constexpr nsecs_t HI_FPS_PERIOD = 11'111'111;

     LayerHistoryTest() { mFlinger.resetScheduler(mScheduler); }

     impl::LayerHistory& history() { return *mScheduler->mutableLayerHistory(); }
     const impl::LayerHistory& history() const { return *mScheduler->mutableLayerHistory(); }

     size_t layerCount() const { return mScheduler->layerHistorySize(); }
     size_t activeLayerCount() const NO_THREAD_SAFETY_ANALYSIS { return history().mActiveLayersEnd; }

     size_t frequentLayerCount(nsecs_t now) const NO_THREAD_SAFETY_ANALYSIS {
         const auto& infos = history().mLayerInfos;
         return std::count_if(infos.begin(), infos.begin() + history().mActiveLayersEnd,
                              [now](const auto& pair) { return pair.second->isFrequent(now); });
     }

     auto createLayer() { return sp<mock::MockLayer>(new mock::MockLayer(mFlinger.flinger())); }

     Hwc2::mock::Display mDisplay;
     RefreshRateConfigs mConfigs{{HWC2::Display::Config::Builder(mDisplay, 0)
                                          .setVsyncPeriod(int32_t(LO_FPS_PERIOD))
                                          .setConfigGroup(0)
                                          .build(),
                                  HWC2::Display::Config::Builder(mDisplay, 1)
                                          .setVsyncPeriod(int32_t(HI_FPS_PERIOD))
                                          .setConfigGroup(0)
                                          .build()},
                                 HwcConfigIndexType(0)};
     TestableScheduler* const mScheduler{new TestableScheduler(mConfigs, false)};
     TestableSurfaceFlinger mFlinger;

     const nsecs_t mTime = systemTime();
 };

 namespace {

 TEST_F(LayerHistoryTest, oneLayer) {
     const auto layer = createLayer();
     EXPECT_CALL(*layer, isVisible()).WillRepeatedly(Return(true));
     EXPECT_CALL(*layer, getFrameSelectionPriority()).WillRepeatedly(Return(1));
     EXPECT_CALL(*layer, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));

     EXPECT_EQ(1, layerCount());
     EXPECT_EQ(0, activeLayerCount());

     // no layers are returned if no layers are active.
     ASSERT_TRUE(history().summarize(mTime).empty());
     EXPECT_EQ(0, activeLayerCount());

     // no layers are returned if active layers have insufficient history.
     for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE - 1; i++) {
         history().record(layer.get(), 0, mTime, LayerHistory::LayerUpdateType::Buffer);
         ASSERT_TRUE(history().summarize(mTime).empty());
         EXPECT_EQ(1, activeLayerCount());
     }

     // High FPS is returned once enough history has been recorded.
     for (int i = 0; i < 10; i++) {
         history().record(layer.get(), 0, mTime, LayerHistory::LayerUpdateType::Buffer);
         ASSERT_EQ(1, history().summarize(mTime).size());
         EXPECT_FLOAT_EQ(HI_FPS, history().summarize(mTime)[0].desiredRefreshRate);
         EXPECT_EQ(1, activeLayerCount());
     }
 }

 TEST_F(LayerHistoryTest, explicitTimestamp) {
     const auto layer = createLayer();
     EXPECT_CALL(*layer, isVisible()).WillRepeatedly(Return(true));
     EXPECT_CALL(*layer, getFrameSelectionPriority()).WillRepeatedly(Return(1));
     EXPECT_CALL(*layer, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));

     EXPECT_EQ(1, layerCount());
     EXPECT_EQ(0, activeLayerCount());

     nsecs_t time = mTime;
     for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
         history().record(layer.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
         time += LO_FPS_PERIOD;
     }

     ASSERT_EQ(1, history().summarize(mTime).size());
     EXPECT_FLOAT_EQ(LO_FPS, history().summarize(mTime)[0].desiredRefreshRate);
     EXPECT_EQ(1, activeLayerCount());
     EXPECT_EQ(1, frequentLayerCount(time));
 }

 TEST_F(LayerHistoryTest, multipleLayers) {
     auto layer1 = createLayer();
     auto layer2 = createLayer();
     auto layer3 = createLayer();

     EXPECT_CALL(*layer1, isVisible()).WillRepeatedly(Return(true));
     EXPECT_CALL(*layer1, getFrameSelectionPriority()).WillRepeatedly(Return(1));
     EXPECT_CALL(*layer1, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));

     EXPECT_CALL(*layer2, isVisible()).WillRepeatedly(Return(true));
     EXPECT_CALL(*layer2, getFrameSelectionPriority()).WillRepeatedly(Return(1));
     EXPECT_CALL(*layer2, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));

     EXPECT_CALL(*layer3, isVisible()).WillRepeatedly(Return(true));
     EXPECT_CALL(*layer3, getFrameSelectionPriority()).WillRepeatedly(Return(1));
     EXPECT_CALL(*layer3, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));
     nsecs_t time = mTime;

     EXPECT_EQ(3, layerCount());
     EXPECT_EQ(0, activeLayerCount());
     EXPECT_EQ(0, frequentLayerCount(time));

     // layer1 is active but infrequent.
     for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
         history().record(layer1.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
         time += MAX_FREQUENT_LAYER_PERIOD_NS.count();
     }

     ASSERT_EQ(1, history().summarize(time).size());
     EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
     EXPECT_EQ(1, activeLayerCount());
     EXPECT_EQ(0, frequentLayerCount(time));

     // layer2 is frequent and has high refresh rate.
     for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
         history().record(layer2.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
         time += HI_FPS_PERIOD;
     }

     // layer1 is still active but infrequent.
     history().record(layer1.get(), time, time, LayerHistory::LayerUpdateType::Buffer);

     ASSERT_EQ(2, history().summarize(time).size());
     EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
     EXPECT_FLOAT_EQ(HI_FPS, history().summarize(time)[1].desiredRefreshRate);
     EXPECT_EQ(2, activeLayerCount());
     EXPECT_EQ(1, frequentLayerCount(time));

     // layer1 is no longer active.
     // layer2 is frequent and has low refresh rate.
     for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
         history().record(layer2.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
         time += LO_FPS_PERIOD;
     }

     ASSERT_EQ(1, history().summarize(time).size());
     EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
     EXPECT_EQ(1, activeLayerCount());
     EXPECT_EQ(1, frequentLayerCount(time));

     // layer2 still has low refresh rate.
     // layer3 has high refresh rate but not enough history.
     constexpr int RATIO = LO_FPS_PERIOD / HI_FPS_PERIOD;
     for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE - 1; i++) {
         if (i % RATIO == 0) {
             history().record(layer2.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
         }

         history().record(layer3.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
         time += HI_FPS_PERIOD;
     }

     ASSERT_EQ(1, history().summarize(time).size());
     EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
     EXPECT_EQ(2, activeLayerCount());
     EXPECT_EQ(2, frequentLayerCount(time));

     // layer3 becomes recently active.
     history().record(layer3.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
     ASSERT_EQ(2, history().summarize(time).size());
     EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
     EXPECT_FLOAT_EQ(HI_FPS, history().summarize(time)[1].desiredRefreshRate);
     EXPECT_EQ(2, activeLayerCount());
     EXPECT_EQ(2, frequentLayerCount(time));

     // layer1 expires.
     layer1.clear();
     ASSERT_EQ(2, history().summarize(time).size());
     EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
     EXPECT_FLOAT_EQ(HI_FPS, history().summarize(time)[1].desiredRefreshRate);
     EXPECT_EQ(2, layerCount());
     EXPECT_EQ(2, activeLayerCount());
     EXPECT_EQ(2, frequentLayerCount(time));

     // layer2 still has low refresh rate.
     // layer3 becomes inactive.
     for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
         history().record(layer2.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
         time += LO_FPS_PERIOD;
     }

     ASSERT_EQ(1, history().summarize(time).size());
     EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
     EXPECT_EQ(1, activeLayerCount());
     EXPECT_EQ(1, frequentLayerCount(time));

     // layer2 expires.
     layer2.clear();
     ASSERT_TRUE(history().summarize(time).empty());
     EXPECT_EQ(1, layerCount());
     EXPECT_EQ(0, activeLayerCount());
     EXPECT_EQ(0, frequentLayerCount(time));

     // layer3 becomes active and has high refresh rate.
     for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
         history().record(layer3.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
         time += HI_FPS_PERIOD;
     }

     ASSERT_EQ(1, history().summarize(time).size());
     EXPECT_FLOAT_EQ(HI_FPS, history().summarize(time)[0].desiredRefreshRate);
     EXPECT_EQ(1, layerCount());
     EXPECT_EQ(1, activeLayerCount());
     EXPECT_EQ(1, frequentLayerCount(time));

     // layer3 expires.
     layer3.clear();
     ASSERT_TRUE(history().summarize(time).empty());
     EXPECT_EQ(0, layerCount());
     EXPECT_EQ(0, activeLayerCount());
     EXPECT_EQ(0, frequentLayerCount(time));
 }

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

 // TODO(b/129481165): remove the #pragma below and fix conversion issues
 #pragma clang diagnostic pop // ignored "-Wconversion"
	/*
	* 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.
	*/

	// TODO(b/129481165): remove the #pragma below and fix conversion issues
	#pragma clang diagnostic push
	#pragma clang diagnostic ignored "-Wconversion"

	#undef LOG_TAG
	#define LOG_TAG "LayerHistoryTest"

	#include <gmock/gmock.h>
	#include <gtest/gtest.h>
	#include <log/log.h>

	#include "Scheduler/LayerHistory.h"
	#include "Scheduler/LayerInfo.h"
	#include "TestableScheduler.h"
	#include "TestableSurfaceFlinger.h"
	#include "mock/MockLayer.h"

	using testing::_;
	using testing::Return;

	namespace android::scheduler {

	class LayerHistoryTest : public testing::Test {
	protected:
	static constexpr auto PRESENT_TIME_HISTORY_SIZE = LayerInfo::PresentTimeHistory::HISTORY_SIZE;
	static constexpr auto MAX_FREQUENT_LAYER_PERIOD_NS = LayerInfo::MAX_FREQUENT_LAYER_PERIOD_NS;

	static constexpr float LO_FPS = 30.f;
	static constexpr nsecs_t LO_FPS_PERIOD = 33'333'333;

	static constexpr float HI_FPS = 90.f;
	static constexpr nsecs_t HI_FPS_PERIOD = 11'111'111;

	LayerHistoryTest() { mFlinger.resetScheduler(mScheduler); }

	impl::LayerHistory& history() { return *mScheduler->mutableLayerHistory(); }
	const impl::LayerHistory& history() const { return *mScheduler->mutableLayerHistory(); }

	size_t layerCount() const { return mScheduler->layerHistorySize(); }
	size_t activeLayerCount() const NO_THREAD_SAFETY_ANALYSIS { return history().mActiveLayersEnd; }

	size_t frequentLayerCount(nsecs_t now) const NO_THREAD_SAFETY_ANALYSIS {
	const auto& infos = history().mLayerInfos;
	return std::count_if(infos.begin(), infos.begin() + history().mActiveLayersEnd,
	[now](const auto& pair) { return pair.second->isFrequent(now); });
	}

	auto createLayer() { return sp<mock::MockLayer>(new mock::MockLayer(mFlinger.flinger())); }

	Hwc2::mock::Display mDisplay;
	RefreshRateConfigs mConfigs{{HWC2::Display::Config::Builder(mDisplay, 0)
	.setVsyncPeriod(int32_t(LO_FPS_PERIOD))
	.setConfigGroup(0)
	.build(),
	HWC2::Display::Config::Builder(mDisplay, 1)
	.setVsyncPeriod(int32_t(HI_FPS_PERIOD))
	.setConfigGroup(0)
	.build()},
	HwcConfigIndexType(0)};
	TestableScheduler* const mScheduler{new TestableScheduler(mConfigs, false)};
	TestableSurfaceFlinger mFlinger;

	const nsecs_t mTime = systemTime();
	};

	namespace {

	TEST_F(LayerHistoryTest, oneLayer) {
	const auto layer = createLayer();
	EXPECT_CALL(*layer, isVisible()).WillRepeatedly(Return(true));
	EXPECT_CALL(*layer, getFrameSelectionPriority()).WillRepeatedly(Return(1));
	EXPECT_CALL(*layer, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));

	EXPECT_EQ(1, layerCount());
	EXPECT_EQ(0, activeLayerCount());

	// no layers are returned if no layers are active.
	ASSERT_TRUE(history().summarize(mTime).empty());
	EXPECT_EQ(0, activeLayerCount());

	// no layers are returned if active layers have insufficient history.
	for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE - 1; i++) {
	history().record(layer.get(), 0, mTime, LayerHistory::LayerUpdateType::Buffer);
	ASSERT_TRUE(history().summarize(mTime).empty());
	EXPECT_EQ(1, activeLayerCount());
	}

	// High FPS is returned once enough history has been recorded.
	for (int i = 0; i < 10; i++) {
	history().record(layer.get(), 0, mTime, LayerHistory::LayerUpdateType::Buffer);
	ASSERT_EQ(1, history().summarize(mTime).size());
	EXPECT_FLOAT_EQ(HI_FPS, history().summarize(mTime)[0].desiredRefreshRate);
	EXPECT_EQ(1, activeLayerCount());
	}
	}

	TEST_F(LayerHistoryTest, explicitTimestamp) {
	const auto layer = createLayer();
	EXPECT_CALL(*layer, isVisible()).WillRepeatedly(Return(true));
	EXPECT_CALL(*layer, getFrameSelectionPriority()).WillRepeatedly(Return(1));
	EXPECT_CALL(*layer, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));

	EXPECT_EQ(1, layerCount());
	EXPECT_EQ(0, activeLayerCount());

	nsecs_t time = mTime;
	for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
	history().record(layer.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
	time += LO_FPS_PERIOD;
	}

	ASSERT_EQ(1, history().summarize(mTime).size());
	EXPECT_FLOAT_EQ(LO_FPS, history().summarize(mTime)[0].desiredRefreshRate);
	EXPECT_EQ(1, activeLayerCount());
	EXPECT_EQ(1, frequentLayerCount(time));
	}

	TEST_F(LayerHistoryTest, multipleLayers) {
	auto layer1 = createLayer();
	auto layer2 = createLayer();
	auto layer3 = createLayer();

	EXPECT_CALL(*layer1, isVisible()).WillRepeatedly(Return(true));
	EXPECT_CALL(*layer1, getFrameSelectionPriority()).WillRepeatedly(Return(1));
	EXPECT_CALL(*layer1, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));

	EXPECT_CALL(*layer2, isVisible()).WillRepeatedly(Return(true));
	EXPECT_CALL(*layer2, getFrameSelectionPriority()).WillRepeatedly(Return(1));
	EXPECT_CALL(*layer2, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));

	EXPECT_CALL(*layer3, isVisible()).WillRepeatedly(Return(true));
	EXPECT_CALL(*layer3, getFrameSelectionPriority()).WillRepeatedly(Return(1));
	EXPECT_CALL(*layer3, getFrameRateForLayerTree()).WillRepeatedly(Return(Layer::FrameRate()));
	nsecs_t time = mTime;

	EXPECT_EQ(3, layerCount());
	EXPECT_EQ(0, activeLayerCount());
	EXPECT_EQ(0, frequentLayerCount(time));

	// layer1 is active but infrequent.
	for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
	history().record(layer1.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
	time += MAX_FREQUENT_LAYER_PERIOD_NS.count();
	}

	ASSERT_EQ(1, history().summarize(time).size());
	EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
	EXPECT_EQ(1, activeLayerCount());
	EXPECT_EQ(0, frequentLayerCount(time));

	// layer2 is frequent and has high refresh rate.
	for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
	history().record(layer2.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
	time += HI_FPS_PERIOD;
	}

	// layer1 is still active but infrequent.
	history().record(layer1.get(), time, time, LayerHistory::LayerUpdateType::Buffer);

	ASSERT_EQ(2, history().summarize(time).size());
	EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
	EXPECT_FLOAT_EQ(HI_FPS, history().summarize(time)[1].desiredRefreshRate);
	EXPECT_EQ(2, activeLayerCount());
	EXPECT_EQ(1, frequentLayerCount(time));

	// layer1 is no longer active.
	// layer2 is frequent and has low refresh rate.
	for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
	history().record(layer2.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
	time += LO_FPS_PERIOD;
	}

	ASSERT_EQ(1, history().summarize(time).size());
	EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
	EXPECT_EQ(1, activeLayerCount());
	EXPECT_EQ(1, frequentLayerCount(time));

	// layer2 still has low refresh rate.
	// layer3 has high refresh rate but not enough history.
	constexpr int RATIO = LO_FPS_PERIOD / HI_FPS_PERIOD;
	for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE - 1; i++) {
	if (i % RATIO == 0) {
	history().record(layer2.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
	}

	history().record(layer3.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
	time += HI_FPS_PERIOD;
	}

	ASSERT_EQ(1, history().summarize(time).size());
	EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
	EXPECT_EQ(2, activeLayerCount());
	EXPECT_EQ(2, frequentLayerCount(time));

	// layer3 becomes recently active.
	history().record(layer3.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
	ASSERT_EQ(2, history().summarize(time).size());
	EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
	EXPECT_FLOAT_EQ(HI_FPS, history().summarize(time)[1].desiredRefreshRate);
	EXPECT_EQ(2, activeLayerCount());
	EXPECT_EQ(2, frequentLayerCount(time));

	// layer1 expires.
	layer1.clear();
	ASSERT_EQ(2, history().summarize(time).size());
	EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
	EXPECT_FLOAT_EQ(HI_FPS, history().summarize(time)[1].desiredRefreshRate);
	EXPECT_EQ(2, layerCount());
	EXPECT_EQ(2, activeLayerCount());
	EXPECT_EQ(2, frequentLayerCount(time));

	// layer2 still has low refresh rate.
	// layer3 becomes inactive.
	for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
	history().record(layer2.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
	time += LO_FPS_PERIOD;
	}

	ASSERT_EQ(1, history().summarize(time).size());
	EXPECT_FLOAT_EQ(LO_FPS, history().summarize(time)[0].desiredRefreshRate);
	EXPECT_EQ(1, activeLayerCount());
	EXPECT_EQ(1, frequentLayerCount(time));

	// layer2 expires.
	layer2.clear();
	ASSERT_TRUE(history().summarize(time).empty());
	EXPECT_EQ(1, layerCount());
	EXPECT_EQ(0, activeLayerCount());
	EXPECT_EQ(0, frequentLayerCount(time));

	// layer3 becomes active and has high refresh rate.
	for (int i = 0; i < PRESENT_TIME_HISTORY_SIZE; i++) {
	history().record(layer3.get(), time, time, LayerHistory::LayerUpdateType::Buffer);
	time += HI_FPS_PERIOD;
	}

	ASSERT_EQ(1, history().summarize(time).size());
	EXPECT_FLOAT_EQ(HI_FPS, history().summarize(time)[0].desiredRefreshRate);
	EXPECT_EQ(1, layerCount());
	EXPECT_EQ(1, activeLayerCount());
	EXPECT_EQ(1, frequentLayerCount(time));

	// layer3 expires.
	layer3.clear();
	ASSERT_TRUE(history().summarize(time).empty());
	EXPECT_EQ(0, layerCount());
	EXPECT_EQ(0, activeLayerCount());
	EXPECT_EQ(0, frequentLayerCount(time));
	}

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

	// TODO(b/129481165): remove the #pragma below and fix conversion issues
	#pragma clang diagnostic pop // ignored "-Wconversion"