/*
 * Copyright 2022 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 <gmock/gmock.h>
#include <gtest/gtest.h>

#include <renderengine/mock/FakeExternalTexture.h>

#include "FrontEnd/LayerLifecycleManager.h"
#include "LayerHierarchyTest.h"
#include "TransactionState.h"

using namespace android::surfaceflinger;

namespace android::surfaceflinger::frontend {

using namespace ftl::flag_operators;

// To run test:
/**
 mp :libsurfaceflinger_unittest && adb sync; adb shell \
    /data/nativetest/libsurfaceflinger_unittest/libsurfaceflinger_unittest \
    --gtest_filter="LayerLifecycleManagerTest.*" --gtest_repeat=100 \
    --gtest_shuffle \
    --gtest_brief=1
*/
class ExpectLayerLifecycleListener : public LayerLifecycleManager::ILifecycleListener {
public:
    void onLayerAdded(const RequestedLayerState& layer) override {
        mActualLayersAdded.push_back(layer.id);
    };
    void onLayerDestroyed(const RequestedLayerState& layer) override {
        mActualLayersDestroyed.emplace(layer.id);
    };

    void expectLayersAdded(const std::vector<uint32_t>& expectedLayersAdded) {
        EXPECT_EQ(expectedLayersAdded, mActualLayersAdded);
        mActualLayersAdded.clear();
    }
    void expectLayersDestroyed(const std::unordered_set<uint32_t>& expectedLayersDestroyed) {
        EXPECT_EQ(expectedLayersDestroyed, mActualLayersDestroyed);
        mActualLayersDestroyed.clear();
    }

    std::vector<uint32_t> mActualLayersAdded;
    std::unordered_set<uint32_t> mActualLayersDestroyed;
};

class LayerLifecycleManagerTest : public LayerHierarchyTestBase {
protected:
    std::unique_ptr<RequestedLayerState> rootLayer(uint32_t id) {
        return std::make_unique<RequestedLayerState>(createArgs(/*id=*/id, /*canBeRoot=*/true,
                                                                /*parent=*/UNASSIGNED_LAYER_ID,
                                                                /*mirror=*/UNASSIGNED_LAYER_ID));
    }

    std::unique_ptr<RequestedLayerState> childLayer(uint32_t id, uint32_t parentId) {
        return std::make_unique<RequestedLayerState>(createArgs(/*id=*/id, /*canBeRoot=*/false,
                                                                parentId,
                                                                /*mirror=*/UNASSIGNED_LAYER_ID));
    }

    RequestedLayerState* getRequestedLayerState(LayerLifecycleManager& lifecycleManager,
                                                uint32_t layerId) {
        return lifecycleManager.getLayerFromId(layerId);
    }
};

TEST_F(LayerLifecycleManagerTest, addLayers) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    layers.emplace_back(rootLayer(2));
    layers.emplace_back(rootLayer(3));
    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.onHandlesDestroyed({{1, "1"}, {2, "2"}, {3, "3"}});
    EXPECT_TRUE(lifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy));
    lifecycleManager.commitChanges();
    EXPECT_FALSE(lifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy));
    listener->expectLayersAdded({1, 2, 3});
    listener->expectLayersDestroyed({1, 2, 3});
}

TEST_F(LayerLifecycleManagerTest, updateLayerStates) {
    LayerLifecycleManager lifecycleManager;
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.applyTransactions(setZTransaction(1, 2));

    auto& managedLayers = lifecycleManager.getLayers();
    ASSERT_EQ(managedLayers.size(), 1u);

    EXPECT_EQ(managedLayers.front()->z, 2);
    EXPECT_TRUE(managedLayers.front()->changes.test(RequestedLayerState::Changes::Z));

    EXPECT_TRUE(lifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy));
    lifecycleManager.commitChanges();
    EXPECT_FALSE(lifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy));
    ASSERT_EQ(managedLayers.size(), 1u);
    EXPECT_FALSE(managedLayers.front()->changes.test(RequestedLayerState::Changes::Z));

    // apply transactions that do not affect the hierarchy
    std::vector<TransactionState> transactions;
    transactions.emplace_back();
    transactions.back().states.push_back({});
    transactions.back().states.front().state.backgroundBlurRadius = 22;
    transactions.back().states.front().state.what = layer_state_t::eBackgroundBlurRadiusChanged;
    transactions.back().states.front().layerId = 1;
    lifecycleManager.applyTransactions(transactions);
    EXPECT_FALSE(lifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy));
    lifecycleManager.commitChanges();
    EXPECT_FALSE(lifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy));
    EXPECT_EQ(managedLayers.front()->backgroundBlurRadius, 22u);
}

TEST_F(LayerLifecycleManagerTest, layerWithoutHandleIsDestroyed) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    layers.emplace_back(rootLayer(2));
    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.onHandlesDestroyed({{1, "1"}});
    lifecycleManager.commitChanges();

    SCOPED_TRACE("layerWithoutHandleIsDestroyed");
    listener->expectLayersAdded({1, 2});
    listener->expectLayersDestroyed({1});
}

TEST_F(LayerLifecycleManagerTest, rootLayerWithoutHandleIsDestroyed) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    layers.emplace_back(rootLayer(2));
    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.onHandlesDestroyed({{1, "1"}});
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({1, 2});
    listener->expectLayersDestroyed({1});
}

TEST_F(LayerLifecycleManagerTest, offscreenLayerIsDestroyed) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    layers.emplace_back(rootLayer(2));
    layers.emplace_back(childLayer(3, /*parent*/ 2));
    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({1, 2, 3});
    listener->expectLayersDestroyed({});

    lifecycleManager.applyTransactions(reparentLayerTransaction(3, UNASSIGNED_LAYER_ID));
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({});
    listener->expectLayersDestroyed({});

    lifecycleManager.onHandlesDestroyed({{3, "3"}});
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({});
    listener->expectLayersDestroyed({3});
}

TEST_F(LayerLifecycleManagerTest, offscreenChildLayerWithHandleIsNotDestroyed) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    layers.emplace_back(rootLayer(2));
    layers.emplace_back(childLayer(3, /*parent*/ 2));
    layers.emplace_back(childLayer(4, /*parent*/ 3));
    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({1, 2, 3, 4});
    listener->expectLayersDestroyed({});

    lifecycleManager.applyTransactions(reparentLayerTransaction(3, UNASSIGNED_LAYER_ID));
    lifecycleManager.onHandlesDestroyed({{3, "3"}});
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({});
    listener->expectLayersDestroyed({3});
}

TEST_F(LayerLifecycleManagerTest, offscreenChildLayerWithoutHandleIsDestroyed) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    layers.emplace_back(rootLayer(2));
    layers.emplace_back(childLayer(3, /*parent*/ 2));
    layers.emplace_back(childLayer(4, /*parent*/ 3));
    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({1, 2, 3, 4});
    listener->expectLayersDestroyed({});

    lifecycleManager.applyTransactions(reparentLayerTransaction(3, UNASSIGNED_LAYER_ID));
    lifecycleManager.onHandlesDestroyed({{3, "3"}, {4, "4"}});
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({});
    listener->expectLayersDestroyed({3, 4});
}

TEST_F(LayerLifecycleManagerTest, reparentingDoesNotAffectRelativeZ) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    layers.emplace_back(rootLayer(2));
    layers.emplace_back(childLayer(3, /*parent*/ 2));
    layers.emplace_back(childLayer(4, /*parent*/ 3));

    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({1, 2, 3, 4});
    listener->expectLayersDestroyed({});

    lifecycleManager.applyTransactions(relativeLayerTransaction(4, 1));
    EXPECT_TRUE(getRequestedLayerState(lifecycleManager, 4)->isRelativeOf);
    lifecycleManager.applyTransactions(reparentLayerTransaction(4, 2));
    EXPECT_TRUE(getRequestedLayerState(lifecycleManager, 4)->isRelativeOf);

    lifecycleManager.commitChanges();
    listener->expectLayersAdded({});
    listener->expectLayersDestroyed({});
}

TEST_F(LayerLifecycleManagerTest, reparentingToNullRemovesRelativeZ) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    layers.emplace_back(rootLayer(2));
    layers.emplace_back(childLayer(3, /*parent*/ 2));
    layers.emplace_back(childLayer(4, /*parent*/ 3));

    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({1, 2, 3, 4});
    listener->expectLayersDestroyed({});

    lifecycleManager.applyTransactions(relativeLayerTransaction(4, 1));
    EXPECT_TRUE(getRequestedLayerState(lifecycleManager, 4)->isRelativeOf);
    lifecycleManager.applyTransactions(reparentLayerTransaction(4, UNASSIGNED_LAYER_ID));
    EXPECT_FALSE(getRequestedLayerState(lifecycleManager, 4)->isRelativeOf);

    lifecycleManager.commitChanges();
    listener->expectLayersAdded({});
    listener->expectLayersDestroyed({});
}

TEST_F(LayerLifecycleManagerTest, setZRemovesRelativeZ) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);
    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    layers.emplace_back(rootLayer(2));
    layers.emplace_back(childLayer(3, /*parent*/ 2));
    layers.emplace_back(childLayer(4, /*parent*/ 3));

    lifecycleManager.addLayers(std::move(layers));
    lifecycleManager.commitChanges();
    listener->expectLayersAdded({1, 2, 3, 4});
    listener->expectLayersDestroyed({});

    lifecycleManager.applyTransactions(relativeLayerTransaction(4, 1));
    EXPECT_TRUE(getRequestedLayerState(lifecycleManager, 4)->isRelativeOf);
    lifecycleManager.applyTransactions(setZTransaction(4, 1));
    EXPECT_FALSE(getRequestedLayerState(lifecycleManager, 4)->isRelativeOf);

    lifecycleManager.commitChanges();
    listener->expectLayersAdded({});
    listener->expectLayersDestroyed({});
}

TEST_F(LayerLifecycleManagerTest, canAddBackgroundLayer) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);

    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    lifecycleManager.addLayers(std::move(layers));

    std::vector<TransactionState> transactions;
    transactions.emplace_back();
    transactions.back().states.push_back({});
    transactions.back().states.front().state.bgColor.a = 0.5;
    transactions.back().states.front().state.what = layer_state_t::eBackgroundColorChanged;
    transactions.back().states.front().layerId = 1;
    lifecycleManager.applyTransactions(transactions);

    auto& managedLayers = lifecycleManager.getLayers();
    ASSERT_EQ(managedLayers.size(), 2u);

    EXPECT_TRUE(lifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy));
    lifecycleManager.commitChanges();
    ASSERT_EQ(listener->mActualLayersAdded.size(), 2u);
    auto bgLayerId = listener->mActualLayersAdded[1];
    listener->expectLayersAdded({1, bgLayerId});
    listener->expectLayersDestroyed({});
    EXPECT_EQ(getRequestedLayerState(lifecycleManager, bgLayerId)->color.a, 0.5_hf);
}

TEST_F(LayerLifecycleManagerTest, canDestroyBackgroundLayer) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);

    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    lifecycleManager.addLayers(std::move(layers));

    std::vector<TransactionState> transactions;
    transactions.emplace_back();
    transactions.back().states.push_back({});
    transactions.back().states.front().state.bgColor.a = 0.5;
    transactions.back().states.front().state.what = layer_state_t::eBackgroundColorChanged;
    transactions.back().states.front().layerId = 1;
    transactions.emplace_back();
    transactions.back().states.push_back({});
    transactions.back().states.front().state.bgColor.a = 0;
    transactions.back().states.front().state.what = layer_state_t::eBackgroundColorChanged;
    transactions.back().states.front().layerId = 1;

    lifecycleManager.applyTransactions(transactions);

    ASSERT_EQ(lifecycleManager.getLayers().size(), 1u);
    ASSERT_EQ(lifecycleManager.getDestroyedLayers().size(), 1u);

    EXPECT_TRUE(lifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy));
    lifecycleManager.commitChanges();
    ASSERT_EQ(listener->mActualLayersAdded.size(), 2u);
    auto bgLayerId = listener->mActualLayersAdded[1];
    listener->expectLayersAdded({1, bgLayerId});
    listener->expectLayersDestroyed({bgLayerId});
}

TEST_F(LayerLifecycleManagerTest, onParentDestroyDestroysBackgroundLayer) {
    LayerLifecycleManager lifecycleManager;
    auto listener = std::make_shared<ExpectLayerLifecycleListener>();
    lifecycleManager.addLifecycleListener(listener);

    std::vector<std::unique_ptr<RequestedLayerState>> layers;
    layers.emplace_back(rootLayer(1));
    lifecycleManager.addLayers(std::move(layers));

    std::vector<TransactionState> transactions;
    transactions.emplace_back();
    transactions.back().states.push_back({});
    transactions.back().states.front().state.bgColor.a = 0.5;
    transactions.back().states.front().state.what = layer_state_t::eBackgroundColorChanged;
    transactions.back().states.front().layerId = 1;
    transactions.emplace_back();
    lifecycleManager.applyTransactions(transactions);
    lifecycleManager.onHandlesDestroyed({{1, "1"}});

    ASSERT_EQ(lifecycleManager.getLayers().size(), 0u);
    ASSERT_EQ(lifecycleManager.getDestroyedLayers().size(), 2u);

    EXPECT_TRUE(lifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Hierarchy));
    lifecycleManager.commitChanges();
    ASSERT_EQ(listener->mActualLayersAdded.size(), 2u);
    auto bgLayerId = listener->mActualLayersAdded[1];
    listener->expectLayersAdded({1, bgLayerId});
    listener->expectLayersDestroyed({1, bgLayerId});
}

TEST_F(LayerLifecycleManagerTest, blurSetsVisibilityChangeFlag) {
    // clear default color on layer so we start with a layer that does not draw anything.
    setColor(1, {-1.f, -1.f, -1.f});
    mLifecycleManager.commitChanges();

    // layer has something to draw
    setBackgroundBlurRadius(1, 2);
    EXPECT_TRUE(
            mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Visibility));
    mLifecycleManager.commitChanges();

    // layer still has something to draw, so visibility shouldn't change
    setBackgroundBlurRadius(1, 3);
    EXPECT_FALSE(
            mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Visibility));
    mLifecycleManager.commitChanges();

    // layer has nothing to draw
    setBackgroundBlurRadius(1, 0);
    EXPECT_TRUE(
            mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Visibility));
    mLifecycleManager.commitChanges();
}

TEST_F(LayerLifecycleManagerTest, colorSetsVisibilityChangeFlag) {
    // clear default color on layer so we start with a layer that does not draw anything.
    setColor(1, {-1.f, -1.f, -1.f});
    mLifecycleManager.commitChanges();

    // layer has something to draw
    setColor(1, {2.f, 3.f, 4.f});
    EXPECT_TRUE(
            mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Visibility));
    mLifecycleManager.commitChanges();

    // layer still has something to draw, so visibility shouldn't change
    setColor(1, {0.f, 0.f, 0.f});
    EXPECT_FALSE(
            mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Visibility));
    mLifecycleManager.commitChanges();

    // layer has nothing to draw
    setColor(1, {-1.f, -1.f, -1.f});
    EXPECT_TRUE(
            mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Visibility));
    mLifecycleManager.commitChanges();
}

TEST_F(LayerLifecycleManagerTest, layerOpacityChangesSetsVisibilityChangeFlag) {
    // add a default buffer and make the layer opaque
    setFlags(1, layer_state_t::eLayerOpaque, layer_state_t::eLayerOpaque);
    setBuffer(1,
              std::make_shared<
                      renderengine::mock::FakeExternalTexture>(1U /*width*/, 1U /*height*/,
                                                               1ULL /* bufferId */,
                                                               HAL_PIXEL_FORMAT_RGBA_8888,
                                                               GRALLOC_USAGE_PROTECTED /*usage*/));

    mLifecycleManager.commitChanges();

    // set new buffer but layer opacity doesn't change
    setBuffer(1,
              std::make_shared<
                      renderengine::mock::FakeExternalTexture>(1U /*width*/, 1U /*height*/,
                                                               2ULL /* bufferId */,
                                                               HAL_PIXEL_FORMAT_RGBA_8888,
                                                               GRALLOC_USAGE_PROTECTED /*usage*/));
    EXPECT_EQ(mLifecycleManager.getGlobalChanges().get(),
              ftl::Flags<RequestedLayerState::Changes>(
                      RequestedLayerState::Changes::Buffer | RequestedLayerState::Changes::Content)
                      .get());
    mLifecycleManager.commitChanges();

    // change layer flags and confirm visibility flag is set
    setFlags(1, layer_state_t::eLayerOpaque, 0);
    EXPECT_TRUE(
            mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Visibility));
    mLifecycleManager.commitChanges();
}

TEST_F(LayerLifecycleManagerTest, bufferFormatChangesSetsVisibilityChangeFlag) {
    // add a default buffer and make the layer opaque
    setFlags(1, layer_state_t::eLayerOpaque, layer_state_t::eLayerOpaque);
    setBuffer(1,
              std::make_shared<
                      renderengine::mock::FakeExternalTexture>(1U /*width*/, 1U /*height*/,
                                                               1ULL /* bufferId */,
                                                               HAL_PIXEL_FORMAT_RGBA_8888,
                                                               GRALLOC_USAGE_PROTECTED /*usage*/));

    mLifecycleManager.commitChanges();

    // set new buffer with an opaque buffer format
    setBuffer(1,
              std::make_shared<
                      renderengine::mock::FakeExternalTexture>(1U /*width*/, 1U /*height*/,
                                                               2ULL /* bufferId */,
                                                               HAL_PIXEL_FORMAT_RGB_888,
                                                               GRALLOC_USAGE_PROTECTED /*usage*/));
    EXPECT_EQ(mLifecycleManager.getGlobalChanges().get(),
              ftl::Flags<RequestedLayerState::Changes>(
                      RequestedLayerState::Changes::Buffer | RequestedLayerState::Changes::Content |
                      RequestedLayerState::Changes::VisibleRegion |
                      RequestedLayerState::Changes::Visibility)
                      .get());
    mLifecycleManager.commitChanges();
}

TEST_F(LayerLifecycleManagerTest, roundedCornerChangesSetsVisibilityChangeFlag) {
    // add a default buffer and make the layer opaque
    setFlags(1, layer_state_t::eLayerOpaque, layer_state_t::eLayerOpaque);
    setBuffer(1,
              std::make_shared<
                      renderengine::mock::FakeExternalTexture>(1U /*width*/, 1U /*height*/,
                                                               1ULL /* bufferId */,
                                                               HAL_PIXEL_FORMAT_RGBA_8888,
                                                               GRALLOC_USAGE_PROTECTED /*usage*/));

    mLifecycleManager.commitChanges();

    // add rounded corners which should make the layer translucent
    setRoundedCorners(1, 5.f);
    EXPECT_EQ(mLifecycleManager.getGlobalChanges().get(),
              ftl::Flags<RequestedLayerState::Changes>(
                      RequestedLayerState::Changes::AffectsChildren |
                      RequestedLayerState::Changes::Content |
                      RequestedLayerState::Changes::Geometry |
                      RequestedLayerState::Changes::VisibleRegion)
                      .get());
    mLifecycleManager.commitChanges();
}

// Even when it does not change visible region, we should mark alpha changes as affecting
// visible region because HWC impl depends on it. writeOutputIndependentGeometryStateToHWC
// is only called if we are updating geometry.
TEST_F(LayerLifecycleManagerTest, alphaChangesAlwaysSetsVisibleRegionFlag) {
    mLifecycleManager.commitChanges();
    float startingAlpha = 0.5f;
    setAlpha(1, startingAlpha);

    // this is expected because layer alpha changes from 1 to 0.5, it may no longer be opaque
    EXPECT_EQ(mLifecycleManager.getGlobalChanges().string(),
              ftl::Flags<RequestedLayerState::Changes>(
                      RequestedLayerState::Changes::Content |
                      RequestedLayerState::Changes::AffectsChildren |
                      RequestedLayerState::Changes::VisibleRegion |
                      RequestedLayerState::Changes::Input)
                      .string());
    EXPECT_EQ(mLifecycleManager.getChangedLayers()[0]->color.a, static_cast<half>(startingAlpha));
    mLifecycleManager.commitChanges();

    float endingAlpha = 0.2f;
    setAlpha(1, endingAlpha);

    // this is not expected but we should make sure this behavior does not change
    EXPECT_EQ(mLifecycleManager.getGlobalChanges().string(),
              ftl::Flags<RequestedLayerState::Changes>(
                      RequestedLayerState::Changes::Content |
                      RequestedLayerState::Changes::AffectsChildren |
                      RequestedLayerState::Changes::VisibleRegion |
                      RequestedLayerState::Changes::Input)
                      .string());
    EXPECT_EQ(mLifecycleManager.getChangedLayers()[0]->color.a, static_cast<half>(endingAlpha));
    mLifecycleManager.commitChanges();

    EXPECT_EQ(mLifecycleManager.getGlobalChanges().string(),
              ftl::Flags<RequestedLayerState::Changes>().string());
}

TEST_F(LayerLifecycleManagerTest, layerSecureChangesSetsVisibilityChangeFlag) {
    // add a default buffer and make the layer secure
    setFlags(1, layer_state_t::eLayerSecure, layer_state_t::eLayerSecure);
    setBuffer(1,
              std::make_shared<renderengine::mock::
                                       FakeExternalTexture>(1U /*width*/, 1U /*height*/,
                                                            1ULL /* bufferId */,
                                                            HAL_PIXEL_FORMAT_RGBA_8888,
                                                            GRALLOC_USAGE_SW_READ_NEVER /*usage*/));

    mLifecycleManager.commitChanges();

    // set new buffer but layer secure doesn't change
    setBuffer(1,
              std::make_shared<renderengine::mock::
                                       FakeExternalTexture>(1U /*width*/, 1U /*height*/,
                                                            2ULL /* bufferId */,
                                                            HAL_PIXEL_FORMAT_RGBA_8888,
                                                            GRALLOC_USAGE_SW_READ_NEVER /*usage*/));
    EXPECT_EQ(mLifecycleManager.getGlobalChanges().get(),
              ftl::Flags<RequestedLayerState::Changes>(
                      RequestedLayerState::Changes::Buffer | RequestedLayerState::Changes::Content)
                      .get());
    mLifecycleManager.commitChanges();

    // change layer flags and confirm visibility flag is set
    setFlags(1, layer_state_t::eLayerSecure, 0);
    EXPECT_TRUE(
            mLifecycleManager.getGlobalChanges().test(RequestedLayerState::Changes::Visibility));
    mLifecycleManager.commitChanges();
}

TEST_F(LayerLifecycleManagerTest, isSimpleBufferUpdate) {
    auto layer = rootLayer(1);

    // no buffer changes
    EXPECT_FALSE(layer->isSimpleBufferUpdate({}));

    {
        layer_state_t state;
        state.what = layer_state_t::eBufferChanged;
        EXPECT_TRUE(layer->isSimpleBufferUpdate(state));
    }

    {
        layer_state_t state;
        state.what = layer_state_t::eReparent | layer_state_t::eBufferChanged;
        EXPECT_FALSE(layer->isSimpleBufferUpdate(state));
    }

    {
        layer_state_t state;
        state.what = layer_state_t::ePositionChanged | layer_state_t::eBufferChanged;
        state.x = 9;
        state.y = 10;
        EXPECT_FALSE(layer->isSimpleBufferUpdate(state));
    }

    {
        layer->x = 9;
        layer->y = 10;
        layer_state_t state;
        state.what = layer_state_t::ePositionChanged | layer_state_t::eBufferChanged;
        state.x = 9;
        state.y = 10;
        EXPECT_TRUE(layer->isSimpleBufferUpdate(state));
    }
}

} // namespace android::surfaceflinger::frontend