diff --git a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_ReadbackTest.cpp b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_ReadbackTest.cpp
index 8726043..34dea9e 100644
--- a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_ReadbackTest.cpp
+++ b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_ReadbackTest.cpp
@@ -167,8 +167,8 @@
     int32_t mDisplayWidth;
     int32_t mDisplayHeight;
     std::vector<ColorMode> mTestColorModes;
-    CommandWriterBase mWriter;
-    CommandReaderBase mReader;
+    ComposerClientWriter mWriter;
+    ComposerClientReader mReader;
     ::android::sp<::android::GraphicBuffer> mGraphicBuffer;
     std::unique_ptr<TestRenderEngine> mTestRenderEngine;
 
diff --git a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_TargetTest.cpp b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_TargetTest.cpp
index 20fffa9..c21a196 100644
--- a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_TargetTest.cpp
+++ b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/VtsHalGraphicsComposer3_TargetTest.cpp
@@ -13,7 +13,8 @@
 #include <android-base/properties.h>
 #include <android/binder_manager.h>
 #include <android/binder_process.h>
-#include <android/hardware/graphics/composer3/command-buffer.h>
+#include <android/hardware/graphics/composer3/ComposerClientReader.h>
+#include <android/hardware/graphics/composer3/ComposerClientWriter.h>
 #include <binder/ProcessState.h>
 #include <gtest/gtest.h>
 #include <ui/GraphicBuffer.h>
@@ -1408,8 +1409,8 @@
     }};
     // clang-format on
 
-    CommandWriterBase mWriter;
-    CommandReaderBase mReader;
+    ComposerClientWriter mWriter;
+    ComposerClientReader mReader;
 };
 
 TEST_P(GraphicsComposerAidlCommandTest, SET_COLOR_TRANSFORM) {
diff --git a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/composer-vts/ReadbackVts.cpp b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/composer-vts/ReadbackVts.cpp
index a6954b4..4de2d71 100644
--- a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/composer-vts/ReadbackVts.cpp
+++ b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/composer-vts/ReadbackVts.cpp
@@ -32,7 +32,7 @@
 const std::vector<Dataspace> ReadbackHelper::dataspaces = {common::Dataspace::SRGB,
                                                            common::Dataspace::DISPLAY_P3};
 
-void TestLayer::write(CommandWriterBase& writer) {
+void TestLayer::write(ComposerClientWriter& writer) {
     writer.setLayerDisplayFrame(mDisplay, mLayer, mDisplayFrame);
     writer.setLayerSourceCrop(mDisplay, mLayer, mSourceCrop);
     writer.setLayerZOrder(mDisplay, mLayer, mZOrder);
@@ -253,7 +253,7 @@
     EXPECT_EQ(::android::OK, status);
 }
 
-void TestColorLayer::write(CommandWriterBase& writer) {
+void TestColorLayer::write(ComposerClientWriter& writer) {
     TestLayer::write(writer);
     writer.setLayerCompositionType(mDisplay, mLayer, Composition::SOLID_COLOR);
     writer.setLayerColor(mDisplay, mLayer, mColor);
@@ -296,7 +296,7 @@
     setSourceCrop({0, 0, (float)width, (float)height});
 }
 
-void TestBufferLayer::write(CommandWriterBase& writer) {
+void TestBufferLayer::write(ComposerClientWriter& writer) {
     TestLayer::write(writer);
     writer.setLayerCompositionType(mDisplay, mLayer, mComposition);
     writer.setLayerVisibleRegion(mDisplay, mLayer, std::vector<Rect>(1, mDisplayFrame));
@@ -345,11 +345,11 @@
     ASSERT_EQ(::android::OK, mGraphicBuffer->initCheck());
 }
 
-void TestBufferLayer::setDataspace(common::Dataspace dataspace, CommandWriterBase& writer) {
+void TestBufferLayer::setDataspace(common::Dataspace dataspace, ComposerClientWriter& writer) {
     writer.setLayerDataspace(mDisplay, mLayer, dataspace);
 }
 
-void TestBufferLayer::setToClientComposition(CommandWriterBase& writer) {
+void TestBufferLayer::setToClientComposition(ComposerClientWriter& writer) {
     writer.setLayerCompositionType(mDisplay, mLayer, Composition::CLIENT);
 }
 
diff --git a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/composer-vts/include/ReadbackVts.h b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/composer-vts/include/ReadbackVts.h
index d40e3d2..60a036e 100644
--- a/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/composer-vts/include/ReadbackVts.h
+++ b/graphics/composer/aidl/android/hardware/graphics/composer3/vts/functional/composer-vts/include/ReadbackVts.h
@@ -23,7 +23,8 @@
 #include <GraphicsComposerCallback.h>
 #include <aidl/android/hardware/graphics/composer3/IComposerClient.h>
 #include <android-base/unique_fd.h>
-#include <android/hardware/graphics/composer3/command-buffer.h>
+#include <android/hardware/graphics/composer3/ComposerClientReader.h>
+#include <android/hardware/graphics/composer3/ComposerClientWriter.h>
 #include <mapper-vts/2.1/MapperVts.h>
 #include <renderengine/RenderEngine.h>
 #include <ui/GraphicBuffer.h>
@@ -61,7 +62,7 @@
     // call destroyLayers here
     virtual ~TestLayer(){};
 
-    virtual void write(CommandWriterBase& writer);
+    virtual void write(ComposerClientWriter& writer);
     virtual LayerSettings toRenderEngineLayerSettings();
 
     void setDisplayFrame(Rect frame) { mDisplayFrame = frame; }
@@ -105,7 +106,7 @@
     TestColorLayer(const std::shared_ptr<IComposerClient>& client, int64_t display)
         : TestLayer{client, display} {}
 
-    void write(CommandWriterBase& writer) override;
+    void write(ComposerClientWriter& writer) override;
 
     LayerSettings toRenderEngineLayerSettings() override;
 
@@ -123,7 +124,7 @@
                     uint32_t height, common::PixelFormat format,
                     Composition composition = Composition::DEVICE);
 
-    void write(CommandWriterBase& writer) override;
+    void write(ComposerClientWriter& writer) override;
 
     LayerSettings toRenderEngineLayerSettings() override;
 
@@ -131,9 +132,9 @@
 
     void setBuffer(std::vector<Color> colors);
 
-    void setDataspace(Dataspace dataspace, CommandWriterBase& writer);
+    void setDataspace(Dataspace dataspace, ComposerClientWriter& writer);
 
-    void setToClientComposition(CommandWriterBase& writer);
+    void setToClientComposition(ComposerClientWriter& writer);
 
     uint32_t getWidth() const { return mWidth; }
 
diff --git a/graphics/composer/aidl/include/android/hardware/graphics/composer3/ComposerClientReader.h b/graphics/composer/aidl/include/android/hardware/graphics/composer3/ComposerClientReader.h
new file mode 100644
index 0000000..1dc9145
--- /dev/null
+++ b/graphics/composer/aidl/include/android/hardware/graphics/composer3/ComposerClientReader.h
@@ -0,0 +1,319 @@
+/*
+ * Copyright 2021 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.
+ */
+
+#pragma once
+
+#include <algorithm>
+#include <limits>
+#include <memory>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include <inttypes.h>
+#include <string.h>
+
+#include <aidl/android/hardware/graphics/common/BlendMode.h>
+#include <aidl/android/hardware/graphics/composer3/ClientTargetProperty.h>
+#include <aidl/android/hardware/graphics/composer3/Color.h>
+#include <aidl/android/hardware/graphics/composer3/Composition.h>
+#include <aidl/android/hardware/graphics/composer3/FloatColor.h>
+#include <aidl/android/hardware/graphics/composer3/HandleIndex.h>
+#include <aidl/android/hardware/graphics/composer3/IComposer.h>
+#include <aidl/android/hardware/graphics/composer3/IComposerClient.h>
+#include <aidl/android/hardware/graphics/composer3/PerFrameMetadata.h>
+#include <aidl/android/hardware/graphics/composer3/PerFrameMetadataBlob.h>
+
+#include <aidl/android/hardware/graphics/composer3/CommandResultPayload.h>
+#include <aidl/android/hardware/graphics/composer3/DisplayCommand.h>
+
+#include <aidl/android/hardware/graphics/common/ColorTransform.h>
+#include <aidl/android/hardware/graphics/common/FRect.h>
+#include <aidl/android/hardware/graphics/common/Rect.h>
+#include <aidl/android/hardware/graphics/common/Transform.h>
+
+#include <log/log.h>
+#include <sync/sync.h>
+
+#include <aidlcommonsupport/NativeHandle.h>
+
+using aidl::android::hardware::graphics::common::BlendMode;
+using aidl::android::hardware::graphics::common::ColorTransform;
+using aidl::android::hardware::graphics::common::Dataspace;
+using aidl::android::hardware::graphics::common::FRect;
+using aidl::android::hardware::graphics::common::Rect;
+using aidl::android::hardware::graphics::common::Transform;
+
+using namespace aidl::android::hardware::graphics::composer3;
+
+using aidl::android::hardware::common::NativeHandle;
+
+namespace aidl::android::hardware::graphics::composer3 {
+
+class ComposerClientReader {
+  public:
+    ~ComposerClientReader() { resetData(); }
+
+    // Parse and execute commands from the command queue.  The commands are
+    // actually return values from the server and will be saved in ReturnData.
+    void parse(const std::vector<CommandResultPayload>& results) {
+        resetData();
+
+        for (const auto& result : results) {
+            switch (result.getTag()) {
+                case CommandResultPayload::Tag::error:
+                    parseSetError(result.get<CommandResultPayload::Tag::error>());
+                    break;
+                case CommandResultPayload::Tag::changedCompositionTypes:
+                    parseSetChangedCompositionTypes(
+                            result.get<CommandResultPayload::Tag::changedCompositionTypes>());
+                    break;
+                case CommandResultPayload::Tag::displayRequest:
+                    parseSetDisplayRequests(
+                            result.get<CommandResultPayload::Tag::displayRequest>());
+                    break;
+                case CommandResultPayload::Tag::presentFence:
+                    parseSetPresentFence(result.get<CommandResultPayload::Tag::presentFence>());
+                    break;
+                case CommandResultPayload::Tag::releaseFences:
+                    parseSetReleaseFences(result.get<CommandResultPayload::Tag::releaseFences>());
+                    break;
+                case CommandResultPayload::Tag::presentOrValidateResult:
+                    parseSetPresentOrValidateDisplayResult(
+                            result.get<CommandResultPayload::Tag::presentOrValidateResult>());
+                    break;
+                case CommandResultPayload::Tag::clientTargetProperty:
+                    parseSetClientTargetProperty(
+                            result.get<CommandResultPayload::Tag::clientTargetProperty>());
+                    break;
+            }
+        }
+    }
+
+    std::vector<CommandError> takeErrors() { return std::move(mErrors); }
+
+    bool hasChanges(int64_t display, uint32_t* outNumChangedCompositionTypes,
+                    uint32_t* outNumLayerRequestMasks) const {
+        auto found = mReturnData.find(display);
+        if (found == mReturnData.end()) {
+            *outNumChangedCompositionTypes = 0;
+            *outNumLayerRequestMasks = 0;
+            return false;
+        }
+
+        const ReturnData& data = found->second;
+
+        *outNumChangedCompositionTypes = static_cast<uint32_t>(data.compositionTypes.size());
+        *outNumLayerRequestMasks = static_cast<uint32_t>(data.requestMasks.size());
+
+        return !(data.compositionTypes.empty() && data.requestMasks.empty());
+    }
+
+    // Get and clear saved changed composition types.
+    void takeChangedCompositionTypes(int64_t display, std::vector<int64_t>* outLayers,
+                                     std::vector<Composition>* outTypes) {
+        auto found = mReturnData.find(display);
+        if (found == mReturnData.end()) {
+            outLayers->clear();
+            outTypes->clear();
+            return;
+        }
+
+        ReturnData& data = found->second;
+
+        *outLayers = std::move(data.changedLayers);
+        *outTypes = std::move(data.compositionTypes);
+    }
+
+    // Get and clear saved display requests.
+    void takeDisplayRequests(int64_t display, uint32_t* outDisplayRequestMask,
+                             std::vector<int64_t>* outLayers,
+                             std::vector<uint32_t>* outLayerRequestMasks) {
+        auto found = mReturnData.find(display);
+        if (found == mReturnData.end()) {
+            *outDisplayRequestMask = 0;
+            outLayers->clear();
+            outLayerRequestMasks->clear();
+            return;
+        }
+
+        ReturnData& data = found->second;
+
+        *outDisplayRequestMask = data.displayRequests;
+        *outLayers = std::move(data.requestedLayers);
+        *outLayerRequestMasks = std::move(data.requestMasks);
+    }
+
+    // Get and clear saved release fences.
+    void takeReleaseFences(int64_t display, std::vector<int64_t>* outLayers,
+                           std::vector<int>* outReleaseFences) {
+        auto found = mReturnData.find(display);
+        if (found == mReturnData.end()) {
+            outLayers->clear();
+            outReleaseFences->clear();
+            return;
+        }
+
+        ReturnData& data = found->second;
+
+        *outLayers = std::move(data.releasedLayers);
+        *outReleaseFences = std::move(data.releaseFences);
+    }
+
+    // Get and clear saved present fence.
+    void takePresentFence(int64_t display, int* outPresentFence) {
+        auto found = mReturnData.find(display);
+        if (found == mReturnData.end()) {
+            *outPresentFence = -1;
+            return;
+        }
+
+        ReturnData& data = found->second;
+
+        *outPresentFence = data.presentFence;
+        data.presentFence = -1;
+    }
+
+    // Get what stage succeeded during PresentOrValidate: Present or Validate
+    void takePresentOrValidateStage(int64_t display, uint32_t* state) {
+        auto found = mReturnData.find(display);
+        if (found == mReturnData.end()) {
+            *state = static_cast<uint32_t>(-1);
+            return;
+        }
+        ReturnData& data = found->second;
+        *state = data.presentOrValidateState;
+    }
+
+    // Get the client target properties requested by hardware composer.
+    void takeClientTargetProperty(int64_t display, ClientTargetProperty* outClientTargetProperty,
+                                  float* outWhitePointNits) {
+        auto found = mReturnData.find(display);
+
+        // If not found, return the default values.
+        if (found == mReturnData.end()) {
+            outClientTargetProperty->pixelFormat = common::PixelFormat::RGBA_8888;
+            outClientTargetProperty->dataspace = Dataspace::UNKNOWN;
+            *outWhitePointNits = -1.f;
+            return;
+        }
+
+        ReturnData& data = found->second;
+        *outClientTargetProperty = data.clientTargetProperty;
+        *outWhitePointNits = data.clientTargetWhitePointNits;
+    }
+
+  private:
+    void resetData() {
+        mErrors.clear();
+
+        for (auto& data : mReturnData) {
+            if (data.second.presentFence >= 0) {
+                close(data.second.presentFence);
+            }
+            for (auto fence : data.second.releaseFences) {
+                if (fence >= 0) {
+                    close(fence);
+                }
+            }
+        }
+
+        mReturnData.clear();
+    }
+
+    void parseSetError(const CommandError& error) { mErrors.emplace_back(error); }
+
+    void parseSetChangedCompositionTypes(const ChangedCompositionTypes& changedCompositionTypes) {
+        auto& data = mReturnData[changedCompositionTypes.display];
+
+        data.changedLayers.reserve(changedCompositionTypes.layers.size());
+        data.compositionTypes.reserve(changedCompositionTypes.layers.size());
+        for (const auto& layer : changedCompositionTypes.layers) {
+            data.changedLayers.push_back(layer.layer);
+            data.compositionTypes.push_back(layer.composition);
+        }
+    }
+
+    void parseSetDisplayRequests(const DisplayRequest& displayRequest) {
+        auto& data = mReturnData[displayRequest.display];
+
+        data.displayRequests = displayRequest.mask;
+        data.requestedLayers.reserve(displayRequest.layerRequests.size());
+        data.requestMasks.reserve(displayRequest.layerRequests.size());
+        for (const auto& layerRequest : displayRequest.layerRequests) {
+            data.requestedLayers.push_back(layerRequest.layer);
+            data.requestMasks.push_back(layerRequest.mask);
+        }
+    }
+
+    void parseSetPresentFence(const PresentFence& presentFence) {
+        auto& data = mReturnData[presentFence.display];
+        if (data.presentFence >= 0) {
+            close(data.presentFence);
+        }
+        data.presentFence = dup(presentFence.fence.get());
+    }
+
+    void parseSetReleaseFences(const ReleaseFences& releaseFences) {
+        auto& data = mReturnData[releaseFences.display];
+        data.releasedLayers.reserve(releaseFences.layers.size());
+        data.releaseFences.reserve(releaseFences.layers.size());
+        for (const auto& layer : releaseFences.layers) {
+            data.releasedLayers.push_back(layer.layer);
+            data.releaseFences.push_back(dup(layer.fence.get()));
+        }
+    }
+
+    void parseSetPresentOrValidateDisplayResult(const PresentOrValidate& presentOrValidate) {
+        auto& data = mReturnData[presentOrValidate.display];
+        data.presentOrValidateState =
+                presentOrValidate.result == PresentOrValidate::Result::Presented ? 1 : 0;
+    }
+
+    void parseSetClientTargetProperty(const ClientTargetPropertyWithNits& clientTargetProperty) {
+        auto& data = mReturnData[clientTargetProperty.display];
+        data.clientTargetProperty.pixelFormat =
+                clientTargetProperty.clientTargetProperty.pixelFormat;
+        data.clientTargetProperty.dataspace = clientTargetProperty.clientTargetProperty.dataspace;
+        data.clientTargetWhitePointNits = clientTargetProperty.whitePointNits;
+    }
+
+    struct ReturnData {
+        int32_t displayRequests = 0;
+
+        std::vector<int64_t> changedLayers;
+        std::vector<Composition> compositionTypes;
+
+        std::vector<int64_t> requestedLayers;
+        std::vector<uint32_t> requestMasks;
+
+        int presentFence = -1;
+
+        std::vector<int64_t> releasedLayers;
+        std::vector<int> releaseFences;
+
+        uint32_t presentOrValidateState;
+
+        ClientTargetProperty clientTargetProperty{common::PixelFormat::RGBA_8888,
+                                                  Dataspace::UNKNOWN};
+        float clientTargetWhitePointNits = -1.f;
+    };
+
+    std::vector<CommandError> mErrors;
+    std::unordered_map<int64_t, ReturnData> mReturnData;
+};
+
+}  // namespace aidl::android::hardware::graphics::composer3
diff --git a/graphics/composer/aidl/include/android/hardware/graphics/composer3/ComposerClientWriter.h b/graphics/composer/aidl/include/android/hardware/graphics/composer3/ComposerClientWriter.h
new file mode 100644
index 0000000..bd03673
--- /dev/null
+++ b/graphics/composer/aidl/include/android/hardware/graphics/composer3/ComposerClientWriter.h
@@ -0,0 +1,272 @@
+/*
+ * Copyright 2021 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.
+ */
+
+#pragma once
+
+#include <algorithm>
+#include <limits>
+#include <memory>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include <inttypes.h>
+#include <string.h>
+
+#include <aidl/android/hardware/graphics/common/BlendMode.h>
+#include <aidl/android/hardware/graphics/composer3/Color.h>
+#include <aidl/android/hardware/graphics/composer3/Composition.h>
+#include <aidl/android/hardware/graphics/composer3/FloatColor.h>
+#include <aidl/android/hardware/graphics/composer3/HandleIndex.h>
+#include <aidl/android/hardware/graphics/composer3/IComposer.h>
+#include <aidl/android/hardware/graphics/composer3/IComposerClient.h>
+#include <aidl/android/hardware/graphics/composer3/PerFrameMetadata.h>
+#include <aidl/android/hardware/graphics/composer3/PerFrameMetadataBlob.h>
+
+#include <aidl/android/hardware/graphics/composer3/DisplayCommand.h>
+
+#include <aidl/android/hardware/graphics/common/ColorTransform.h>
+#include <aidl/android/hardware/graphics/common/FRect.h>
+#include <aidl/android/hardware/graphics/common/Rect.h>
+#include <aidl/android/hardware/graphics/common/Transform.h>
+
+#include <log/log.h>
+#include <sync/sync.h>
+
+#include <aidlcommonsupport/NativeHandle.h>
+
+using aidl::android::hardware::graphics::common::BlendMode;
+using aidl::android::hardware::graphics::common::ColorTransform;
+using aidl::android::hardware::graphics::common::Dataspace;
+using aidl::android::hardware::graphics::common::FRect;
+using aidl::android::hardware::graphics::common::Rect;
+using aidl::android::hardware::graphics::common::Transform;
+
+using namespace aidl::android::hardware::graphics::composer3;
+
+using aidl::android::hardware::common::NativeHandle;
+
+namespace aidl::android::hardware::graphics::composer3 {
+
+class ComposerClientWriter {
+  public:
+    ComposerClientWriter() { reset(); }
+
+    virtual ~ComposerClientWriter() { reset(); }
+
+    void reset() {
+        mDisplayCommand.reset();
+        mLayerCommand.reset();
+        mCommands.clear();
+    }
+
+    void setColorTransform(int64_t display, const float* matrix, ColorTransform hint) {
+        ColorTransformPayload colorTransformPayload;
+        colorTransformPayload.matrix.assign(matrix, matrix + 16);
+        colorTransformPayload.hint = hint;
+        getDisplayCommand(display).colorTransform.emplace(std::move(colorTransformPayload));
+    }
+
+    void setClientTarget(int64_t display, uint32_t slot, const native_handle_t* target,
+                         int acquireFence, Dataspace dataspace, const std::vector<Rect>& damage) {
+        ClientTarget clientTargetCommand;
+        clientTargetCommand.buffer = getBuffer(slot, target, acquireFence);
+        clientTargetCommand.dataspace = dataspace;
+        clientTargetCommand.damage.assign(damage.begin(), damage.end());
+        getDisplayCommand(display).clientTarget.emplace(std::move(clientTargetCommand));
+    }
+
+    void setOutputBuffer(int64_t display, uint32_t slot, const native_handle_t* buffer,
+                         int releaseFence) {
+        getDisplayCommand(display).virtualDisplayOutputBuffer.emplace(
+                getBuffer(slot, buffer, releaseFence));
+    }
+
+    void validateDisplay(int64_t display) { getDisplayCommand(display).validateDisplay = true; }
+
+    void presentOrvalidateDisplay(int64_t display) {
+        getDisplayCommand(display).presentOrValidateDisplay = true;
+    }
+
+    void acceptDisplayChanges(int64_t display) {
+        getDisplayCommand(display).acceptDisplayChanges = true;
+    }
+
+    void presentDisplay(int64_t display) { getDisplayCommand(display).presentDisplay = true; }
+
+    void setLayerCursorPosition(int64_t display, int64_t layer, int32_t x, int32_t y) {
+        common::Point cursorPosition;
+        cursorPosition.x = x;
+        cursorPosition.y = y;
+        getLayerCommand(display, layer).cursorPosition.emplace(std::move(cursorPosition));
+    }
+
+    void setLayerBuffer(int64_t display, int64_t layer, uint32_t slot,
+                        const native_handle_t* buffer, int acquireFence) {
+        getLayerCommand(display, layer).buffer = getBuffer(slot, buffer, acquireFence);
+    }
+
+    void setLayerSurfaceDamage(int64_t display, int64_t layer, const std::vector<Rect>& damage) {
+        getLayerCommand(display, layer).damage.emplace(damage.begin(), damage.end());
+    }
+
+    void setLayerBlendMode(int64_t display, int64_t layer, BlendMode mode) {
+        ParcelableBlendMode parcelableBlendMode;
+        parcelableBlendMode.blendMode = mode;
+        getLayerCommand(display, layer).blendMode.emplace(std::move(parcelableBlendMode));
+    }
+
+    void setLayerColor(int64_t display, int64_t layer, Color color) {
+        getLayerCommand(display, layer).color.emplace(std::move(color));
+    }
+
+    void setLayerCompositionType(int64_t display, int64_t layer, Composition type) {
+        ParcelableComposition compositionPayload;
+        compositionPayload.composition = type;
+        getLayerCommand(display, layer).composition.emplace(std::move(compositionPayload));
+    }
+
+    void setLayerDataspace(int64_t display, int64_t layer, Dataspace dataspace) {
+        ParcelableDataspace dataspacePayload;
+        dataspacePayload.dataspace = dataspace;
+        getLayerCommand(display, layer).dataspace.emplace(std::move(dataspacePayload));
+    }
+
+    void setLayerDisplayFrame(int64_t display, int64_t layer, const Rect& frame) {
+        getLayerCommand(display, layer).displayFrame.emplace(frame);
+    }
+
+    void setLayerPlaneAlpha(int64_t display, int64_t layer, float alpha) {
+        PlaneAlpha planeAlpha;
+        planeAlpha.alpha = alpha;
+        getLayerCommand(display, layer).planeAlpha.emplace(std::move(planeAlpha));
+    }
+
+    void setLayerSidebandStream(int64_t display, int64_t layer, const native_handle_t* stream) {
+        NativeHandle handle;
+        if (stream) handle = ::android::dupToAidl(stream);
+        getLayerCommand(display, layer).sidebandStream.emplace(std::move(handle));
+    }
+
+    void setLayerSourceCrop(int64_t display, int64_t layer, const FRect& crop) {
+        getLayerCommand(display, layer).sourceCrop.emplace(crop);
+    }
+
+    void setLayerTransform(int64_t display, int64_t layer, Transform transform) {
+        ParcelableTransform transformPayload;
+        transformPayload.transform = transform;
+        getLayerCommand(display, layer).transform.emplace(std::move(transformPayload));
+    }
+
+    void setLayerVisibleRegion(int64_t display, int64_t layer, const std::vector<Rect>& visible) {
+        getLayerCommand(display, layer).visibleRegion.emplace(visible.begin(), visible.end());
+    }
+
+    void setLayerZOrder(int64_t display, int64_t layer, uint32_t z) {
+        ZOrder zorder;
+        zorder.z = z;
+        getLayerCommand(display, layer).z.emplace(std::move(zorder));
+    }
+
+    void setLayerPerFrameMetadata(int64_t display, int64_t layer,
+                                  const std::vector<PerFrameMetadata>& metadataVec) {
+        getLayerCommand(display, layer)
+                .perFrameMetadata.emplace(metadataVec.begin(), metadataVec.end());
+    }
+
+    void setLayerColorTransform(int64_t display, int64_t layer, const float* matrix) {
+        getLayerCommand(display, layer).colorTransform.emplace(matrix, matrix + 16);
+    }
+
+    void setLayerPerFrameMetadataBlobs(int64_t display, int64_t layer,
+                                       const std::vector<PerFrameMetadataBlob>& metadata) {
+        getLayerCommand(display, layer)
+                .perFrameMetadataBlob.emplace(metadata.begin(), metadata.end());
+    }
+
+    void setLayerFloatColor(int64_t display, int64_t layer, FloatColor color) {
+        getLayerCommand(display, layer).floatColor.emplace(color);
+    }
+
+    void setLayerGenericMetadata(int64_t display, int64_t layer, const std::string& key,
+                                 const bool mandatory, const std::vector<uint8_t>& value) {
+        GenericMetadata metadata;
+        metadata.key.name = key;
+        metadata.key.mandatory = mandatory;
+        metadata.value.assign(value.begin(), value.end());
+        getLayerCommand(display, layer).genericMetadata.emplace(std::move(metadata));
+    }
+
+    void setLayerWhitePointNits(int64_t display, int64_t layer, float whitePointNits) {
+        getLayerCommand(display, layer)
+                .whitePointNits.emplace(WhitePointNits{.nits = whitePointNits});
+    }
+
+    const std::vector<DisplayCommand>& getPendingCommands() {
+        flushLayerCommand();
+        flushDisplayCommand();
+        return mCommands;
+    }
+
+  private:
+    std::optional<DisplayCommand> mDisplayCommand;
+    std::optional<LayerCommand> mLayerCommand;
+    std::vector<DisplayCommand> mCommands;
+
+    Buffer getBuffer(int slot, const native_handle_t* bufferHandle, int fence) {
+        Buffer bufferCommand;
+        bufferCommand.slot = slot;
+        if (bufferHandle) bufferCommand.handle.emplace(::android::dupToAidl(bufferHandle));
+        if (fence > 0) bufferCommand.fence = ::ndk::ScopedFileDescriptor(fence);
+        return bufferCommand;
+    }
+
+    void flushLayerCommand() {
+        if (mLayerCommand.has_value()) {
+            mDisplayCommand->layers.emplace_back(std::move(*mLayerCommand));
+            mLayerCommand.reset();
+        }
+    }
+
+    void flushDisplayCommand() {
+        if (mDisplayCommand.has_value()) {
+            mCommands.emplace_back(std::move(*mDisplayCommand));
+            mDisplayCommand.reset();
+        }
+    }
+
+    DisplayCommand& getDisplayCommand(int64_t display) {
+        if (!mDisplayCommand.has_value() || mDisplayCommand->display != display) {
+            flushLayerCommand();
+            flushDisplayCommand();
+            mDisplayCommand.emplace();
+            mDisplayCommand->display = display;
+        }
+        return *mDisplayCommand;
+    }
+
+    LayerCommand& getLayerCommand(int64_t display, int64_t layer) {
+        getDisplayCommand(display);
+        if (!mLayerCommand.has_value() || mLayerCommand->layer != layer) {
+            flushLayerCommand();
+            mLayerCommand.emplace();
+            mLayerCommand->layer = layer;
+        }
+        return *mLayerCommand;
+    }
+};
+
+}  // namespace aidl::android::hardware::graphics::composer3
diff --git a/graphics/composer/aidl/include/android/hardware/graphics/composer3/command-buffer.h b/graphics/composer/aidl/include/android/hardware/graphics/composer3/command-buffer.h
deleted file mode 100644
index fcf2a34..0000000
--- a/graphics/composer/aidl/include/android/hardware/graphics/composer3/command-buffer.h
+++ /dev/null
@@ -1,614 +0,0 @@
-/*
- * Copyright 2021 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.
- */
-
-#pragma once
-
-#include <algorithm>
-#include <limits>
-#include <memory>
-#include <unordered_map>
-#include <unordered_set>
-#include <vector>
-
-#include <inttypes.h>
-#include <string.h>
-
-#include <aidl/android/hardware/graphics/common/BlendMode.h>
-#include <aidl/android/hardware/graphics/composer3/ClientTargetProperty.h>
-#include <aidl/android/hardware/graphics/composer3/Color.h>
-#include <aidl/android/hardware/graphics/composer3/Composition.h>
-#include <aidl/android/hardware/graphics/composer3/FloatColor.h>
-#include <aidl/android/hardware/graphics/composer3/HandleIndex.h>
-#include <aidl/android/hardware/graphics/composer3/IComposer.h>
-#include <aidl/android/hardware/graphics/composer3/IComposerClient.h>
-#include <aidl/android/hardware/graphics/composer3/PerFrameMetadata.h>
-#include <aidl/android/hardware/graphics/composer3/PerFrameMetadataBlob.h>
-
-#include <aidl/android/hardware/graphics/composer3/CommandResultPayload.h>
-#include <aidl/android/hardware/graphics/composer3/DisplayCommand.h>
-
-#include <aidl/android/hardware/graphics/common/ColorTransform.h>
-#include <aidl/android/hardware/graphics/common/FRect.h>
-#include <aidl/android/hardware/graphics/common/Rect.h>
-#include <aidl/android/hardware/graphics/common/Transform.h>
-
-#include <log/log.h>
-#include <sync/sync.h>
-
-#include <aidlcommonsupport/NativeHandle.h>
-
-using aidl::android::hardware::graphics::common::BlendMode;
-using aidl::android::hardware::graphics::common::ColorTransform;
-using aidl::android::hardware::graphics::common::Dataspace;
-using aidl::android::hardware::graphics::common::FRect;
-using aidl::android::hardware::graphics::common::Rect;
-using aidl::android::hardware::graphics::common::Transform;
-
-using namespace aidl::android::hardware::graphics::composer3;
-
-using aidl::android::hardware::common::NativeHandle;
-
-namespace aidl::android::hardware::graphics::composer3 {
-
-// This class helps build a command queue.  Note that all sizes/lengths are in
-// units of uint32_t's.
-class CommandWriterBase {
-  public:
-    CommandWriterBase() { reset(); }
-
-    virtual ~CommandWriterBase() { reset(); }
-
-    void reset() {
-        mDisplayCommand.reset();
-        mLayerCommand.reset();
-        mCommands.clear();
-        mCommandsResults.clear();
-    }
-
-    void setError(int32_t index, int32_t errorCode) {
-        CommandError error;
-        error.commandIndex = index;
-        error.errorCode = errorCode;
-        mCommandsResults.emplace_back(std::move(error));
-    }
-
-    void setPresentOrValidateResult(int64_t display, PresentOrValidate::Result result) {
-        PresentOrValidate presentOrValidate;
-        presentOrValidate.display = display;
-        presentOrValidate.result = result;
-        mCommandsResults.emplace_back(std::move(presentOrValidate));
-    }
-
-    void setChangedCompositionTypes(int64_t display, const std::vector<int64_t>& layers,
-                                    const std::vector<Composition>& types) {
-        ChangedCompositionTypes changedCompositionTypes;
-        changedCompositionTypes.display = display;
-        changedCompositionTypes.layers.reserve(layers.size());
-        for (int i = 0; i < layers.size(); i++) {
-            auto layer = ChangedCompositionLayer{.layer = layers[i], .composition = types[i]};
-            changedCompositionTypes.layers.emplace_back(std::move(layer));
-        }
-        mCommandsResults.emplace_back(std::move(changedCompositionTypes));
-    }
-
-    void setDisplayRequests(int64_t display, int32_t displayRequestMask,
-                            const std::vector<int64_t>& layers,
-                            const std::vector<int32_t>& layerRequestMasks) {
-        DisplayRequest displayRequest;
-        displayRequest.display = display;
-        displayRequest.mask = displayRequestMask;
-        displayRequest.layerRequests.reserve(layers.size());
-        for (int i = 0; i < layers.size(); i++) {
-            auto layerRequest =
-                    DisplayRequest::LayerRequest{.layer = layers[i], .mask = layerRequestMasks[i]};
-            displayRequest.layerRequests.emplace_back(std::move(layerRequest));
-        }
-        mCommandsResults.emplace_back(std::move(displayRequest));
-    }
-
-    void setPresentFence(int64_t display, ::ndk::ScopedFileDescriptor presentFence) {
-        if (presentFence.get() >= 0) {
-            PresentFence presentFenceCommand;
-            presentFenceCommand.fence = std::move(presentFence);
-            presentFenceCommand.display = display;
-            mCommandsResults.emplace_back(std::move(presentFenceCommand));
-        } else {
-            ALOGW("%s: invalid present fence %d", __func__, presentFence.get());
-        }
-    }
-
-    void setReleaseFences(int64_t display, const std::vector<int64_t>& layers,
-                          std::vector<::ndk::ScopedFileDescriptor> releaseFences) {
-        ReleaseFences releaseFencesCommand;
-        releaseFencesCommand.display = display;
-        for (int i = 0; i < layers.size(); i++) {
-            if (releaseFences[i].get() >= 0) {
-                ReleaseFences::Layer layer;
-                layer.layer = layers[i];
-                layer.fence = std::move(releaseFences[i]);
-                releaseFencesCommand.layers.emplace_back(std::move(layer));
-            } else {
-                ALOGW("%s: invalid release fence %d", __func__, releaseFences[i].get());
-            }
-        }
-        mCommandsResults.emplace_back(std::move(releaseFencesCommand));
-    }
-
-    void setClientTargetProperty(int64_t display, const ClientTargetProperty& clientTargetProperty,
-                                 float whitePointNits) {
-        ClientTargetPropertyWithNits clientTargetPropertyWithNits;
-        clientTargetPropertyWithNits.display = display;
-        clientTargetPropertyWithNits.clientTargetProperty = clientTargetProperty;
-        clientTargetPropertyWithNits.whitePointNits = whitePointNits;
-        mCommandsResults.emplace_back(std::move(clientTargetPropertyWithNits));
-    }
-
-    void setColorTransform(int64_t display, const float* matrix, ColorTransform hint) {
-        ColorTransformPayload colorTransformPayload;
-        colorTransformPayload.matrix.assign(matrix, matrix + 16);
-        colorTransformPayload.hint = hint;
-        getDisplayCommand(display).colorTransform.emplace(std::move(colorTransformPayload));
-    }
-
-    void setClientTarget(int64_t display, uint32_t slot, const native_handle_t* target,
-                         int acquireFence, Dataspace dataspace, const std::vector<Rect>& damage) {
-        ClientTarget clientTargetCommand;
-        clientTargetCommand.buffer = getBuffer(slot, target, acquireFence);
-        clientTargetCommand.dataspace = dataspace;
-        clientTargetCommand.damage.assign(damage.begin(), damage.end());
-        getDisplayCommand(display).clientTarget.emplace(std::move(clientTargetCommand));
-    }
-
-    void setOutputBuffer(int64_t display, uint32_t slot, const native_handle_t* buffer,
-                         int releaseFence) {
-        getDisplayCommand(display).virtualDisplayOutputBuffer.emplace(
-                getBuffer(slot, buffer, releaseFence));
-    }
-
-    void validateDisplay(int64_t display) { getDisplayCommand(display).validateDisplay = true; }
-
-    void presentOrvalidateDisplay(int64_t display) {
-        getDisplayCommand(display).presentOrValidateDisplay = true;
-    }
-
-    void acceptDisplayChanges(int64_t display) {
-        getDisplayCommand(display).acceptDisplayChanges = true;
-    }
-
-    void presentDisplay(int64_t display) { getDisplayCommand(display).presentDisplay = true; }
-
-    void setLayerCursorPosition(int64_t display, int64_t layer, int32_t x, int32_t y) {
-        common::Point cursorPosition;
-        cursorPosition.x = x;
-        cursorPosition.y = y;
-        getLayerCommand(display, layer).cursorPosition.emplace(std::move(cursorPosition));
-    }
-
-    void setLayerBuffer(int64_t display, int64_t layer, uint32_t slot,
-                        const native_handle_t* buffer, int acquireFence) {
-        getLayerCommand(display, layer).buffer = getBuffer(slot, buffer, acquireFence);
-    }
-
-    void setLayerSurfaceDamage(int64_t display, int64_t layer, const std::vector<Rect>& damage) {
-        getLayerCommand(display, layer).damage.emplace(damage.begin(), damage.end());
-    }
-
-    void setLayerBlendMode(int64_t display, int64_t layer, BlendMode mode) {
-        ParcelableBlendMode parcelableBlendMode;
-        parcelableBlendMode.blendMode = mode;
-        getLayerCommand(display, layer).blendMode.emplace(std::move(parcelableBlendMode));
-    }
-
-    void setLayerColor(int64_t display, int64_t layer, Color color) {
-        getLayerCommand(display, layer).color.emplace(std::move(color));
-    }
-
-    void setLayerCompositionType(int64_t display, int64_t layer, Composition type) {
-        ParcelableComposition compositionPayload;
-        compositionPayload.composition = type;
-        getLayerCommand(display, layer).composition.emplace(std::move(compositionPayload));
-    }
-
-    void setLayerDataspace(int64_t display, int64_t layer, Dataspace dataspace) {
-        ParcelableDataspace dataspacePayload;
-        dataspacePayload.dataspace = dataspace;
-        getLayerCommand(display, layer).dataspace.emplace(std::move(dataspacePayload));
-    }
-
-    void setLayerDisplayFrame(int64_t display, int64_t layer, const Rect& frame) {
-        getLayerCommand(display, layer).displayFrame.emplace(frame);
-    }
-
-    void setLayerPlaneAlpha(int64_t display, int64_t layer, float alpha) {
-        PlaneAlpha planeAlpha;
-        planeAlpha.alpha = alpha;
-        getLayerCommand(display, layer).planeAlpha.emplace(std::move(planeAlpha));
-    }
-
-    void setLayerSidebandStream(int64_t display, int64_t layer, const native_handle_t* stream) {
-        NativeHandle handle;
-        if (stream) handle = ::android::dupToAidl(stream);
-        getLayerCommand(display, layer).sidebandStream.emplace(std::move(handle));
-    }
-
-    void setLayerSourceCrop(int64_t display, int64_t layer, const FRect& crop) {
-        getLayerCommand(display, layer).sourceCrop.emplace(crop);
-    }
-
-    void setLayerTransform(int64_t display, int64_t layer, Transform transform) {
-        ParcelableTransform transformPayload;
-        transformPayload.transform = transform;
-        getLayerCommand(display, layer).transform.emplace(std::move(transformPayload));
-    }
-
-    void setLayerVisibleRegion(int64_t display, int64_t layer, const std::vector<Rect>& visible) {
-        getLayerCommand(display, layer).visibleRegion.emplace(visible.begin(), visible.end());
-    }
-
-    void setLayerZOrder(int64_t display, int64_t layer, uint32_t z) {
-        ZOrder zorder;
-        zorder.z = z;
-        getLayerCommand(display, layer).z.emplace(std::move(zorder));
-    }
-
-    void setLayerPerFrameMetadata(int64_t display, int64_t layer,
-                                  const std::vector<PerFrameMetadata>& metadataVec) {
-        getLayerCommand(display, layer)
-                .perFrameMetadata.emplace(metadataVec.begin(), metadataVec.end());
-    }
-
-    void setLayerColorTransform(int64_t display, int64_t layer, const float* matrix) {
-        getLayerCommand(display, layer).colorTransform.emplace(matrix, matrix + 16);
-    }
-
-    void setLayerPerFrameMetadataBlobs(int64_t display, int64_t layer,
-                                       const std::vector<PerFrameMetadataBlob>& metadata) {
-        getLayerCommand(display, layer)
-                .perFrameMetadataBlob.emplace(metadata.begin(), metadata.end());
-    }
-
-    void setLayerFloatColor(int64_t display, int64_t layer, FloatColor color) {
-        getLayerCommand(display, layer).floatColor.emplace(color);
-    }
-
-    void setLayerGenericMetadata(int64_t display, int64_t layer, const std::string& key,
-                                 const bool mandatory, const std::vector<uint8_t>& value) {
-        GenericMetadata metadata;
-        metadata.key.name = key;
-        metadata.key.mandatory = mandatory;
-        metadata.value.assign(value.begin(), value.end());
-        getLayerCommand(display, layer).genericMetadata.emplace(std::move(metadata));
-    }
-
-    void setLayerWhitePointNits(int64_t display, int64_t layer, float whitePointNits) {
-        getLayerCommand(display, layer)
-                .whitePointNits.emplace(WhitePointNits{.nits = whitePointNits});
-    }
-
-    const std::vector<DisplayCommand>& getPendingCommands() {
-        flushLayerCommand();
-        flushDisplayCommand();
-        return mCommands;
-    }
-
-    std::vector<CommandResultPayload> getPendingCommandResults() {
-        return std::move(mCommandsResults);
-    }
-
-  protected:
-    Buffer getBuffer(int slot, const native_handle_t* bufferHandle, int fence) {
-        Buffer bufferCommand;
-        bufferCommand.slot = slot;
-        if (bufferHandle) bufferCommand.handle.emplace(::android::dupToAidl(bufferHandle));
-        if (fence > 0) bufferCommand.fence = ::ndk::ScopedFileDescriptor(fence);
-        return bufferCommand;
-    }
-
-    std::optional<DisplayCommand> mDisplayCommand;
-    std::optional<LayerCommand> mLayerCommand;
-    std::vector<DisplayCommand> mCommands;
-    std::vector<CommandResultPayload> mCommandsResults;
-
-  private:
-    void flushLayerCommand() {
-        if (mLayerCommand.has_value()) {
-            mDisplayCommand->layers.emplace_back(std::move(*mLayerCommand));
-            mLayerCommand.reset();
-        }
-    }
-
-    void flushDisplayCommand() {
-        if (mDisplayCommand.has_value()) {
-            mCommands.emplace_back(std::move(*mDisplayCommand));
-            mDisplayCommand.reset();
-        }
-    }
-
-    DisplayCommand& getDisplayCommand(int64_t display) {
-        if (!mDisplayCommand.has_value() || mDisplayCommand->display != display) {
-            flushLayerCommand();
-            flushDisplayCommand();
-            mDisplayCommand.emplace();
-            mDisplayCommand->display = display;
-        }
-        return *mDisplayCommand;
-    }
-
-    LayerCommand& getLayerCommand(int64_t display, int64_t layer) {
-        getDisplayCommand(display);
-        if (!mLayerCommand.has_value() || mLayerCommand->layer != layer) {
-            flushLayerCommand();
-            mLayerCommand.emplace();
-            mLayerCommand->layer = layer;
-        }
-        return *mLayerCommand;
-    }
-};
-
-class CommandReaderBase {
-  public:
-    ~CommandReaderBase() { resetData(); }
-
-    // Parse and execute commands from the command queue.  The commands are
-    // actually return values from the server and will be saved in ReturnData.
-    void parse(const std::vector<CommandResultPayload>& results) {
-        resetData();
-
-        for (const auto& result : results) {
-            switch (result.getTag()) {
-                case CommandResultPayload::Tag::error:
-                    parseSetError(result.get<CommandResultPayload::Tag::error>());
-                    break;
-                case CommandResultPayload::Tag::changedCompositionTypes:
-                    parseSetChangedCompositionTypes(
-                            result.get<CommandResultPayload::Tag::changedCompositionTypes>());
-                    break;
-                case CommandResultPayload::Tag::displayRequest:
-                    parseSetDisplayRequests(
-                            result.get<CommandResultPayload::Tag::displayRequest>());
-                    break;
-                case CommandResultPayload::Tag::presentFence:
-                    parseSetPresentFence(result.get<CommandResultPayload::Tag::presentFence>());
-                    break;
-                case CommandResultPayload::Tag::releaseFences:
-                    parseSetReleaseFences(result.get<CommandResultPayload::Tag::releaseFences>());
-                    break;
-                case CommandResultPayload::Tag::presentOrValidateResult:
-                    parseSetPresentOrValidateDisplayResult(
-                            result.get<CommandResultPayload::Tag::presentOrValidateResult>());
-                    break;
-                case CommandResultPayload::Tag::clientTargetProperty:
-                    parseSetClientTargetProperty(
-                            result.get<CommandResultPayload::Tag::clientTargetProperty>());
-                    break;
-            }
-        }
-    }
-
-    std::vector<CommandError> takeErrors() { return std::move(mErrors); }
-
-    bool hasChanges(int64_t display, uint32_t* outNumChangedCompositionTypes,
-                    uint32_t* outNumLayerRequestMasks) const {
-        auto found = mReturnData.find(display);
-        if (found == mReturnData.end()) {
-            *outNumChangedCompositionTypes = 0;
-            *outNumLayerRequestMasks = 0;
-            return false;
-        }
-
-        const ReturnData& data = found->second;
-
-        *outNumChangedCompositionTypes = static_cast<uint32_t>(data.compositionTypes.size());
-        *outNumLayerRequestMasks = static_cast<uint32_t>(data.requestMasks.size());
-
-        return !(data.compositionTypes.empty() && data.requestMasks.empty());
-    }
-
-    // Get and clear saved changed composition types.
-    void takeChangedCompositionTypes(int64_t display, std::vector<int64_t>* outLayers,
-                                     std::vector<Composition>* outTypes) {
-        auto found = mReturnData.find(display);
-        if (found == mReturnData.end()) {
-            outLayers->clear();
-            outTypes->clear();
-            return;
-        }
-
-        ReturnData& data = found->second;
-
-        *outLayers = std::move(data.changedLayers);
-        *outTypes = std::move(data.compositionTypes);
-    }
-
-    // Get and clear saved display requests.
-    void takeDisplayRequests(int64_t display, uint32_t* outDisplayRequestMask,
-                             std::vector<int64_t>* outLayers,
-                             std::vector<uint32_t>* outLayerRequestMasks) {
-        auto found = mReturnData.find(display);
-        if (found == mReturnData.end()) {
-            *outDisplayRequestMask = 0;
-            outLayers->clear();
-            outLayerRequestMasks->clear();
-            return;
-        }
-
-        ReturnData& data = found->second;
-
-        *outDisplayRequestMask = data.displayRequests;
-        *outLayers = std::move(data.requestedLayers);
-        *outLayerRequestMasks = std::move(data.requestMasks);
-    }
-
-    // Get and clear saved release fences.
-    void takeReleaseFences(int64_t display, std::vector<int64_t>* outLayers,
-                           std::vector<int>* outReleaseFences) {
-        auto found = mReturnData.find(display);
-        if (found == mReturnData.end()) {
-            outLayers->clear();
-            outReleaseFences->clear();
-            return;
-        }
-
-        ReturnData& data = found->second;
-
-        *outLayers = std::move(data.releasedLayers);
-        *outReleaseFences = std::move(data.releaseFences);
-    }
-
-    // Get and clear saved present fence.
-    void takePresentFence(int64_t display, int* outPresentFence) {
-        auto found = mReturnData.find(display);
-        if (found == mReturnData.end()) {
-            *outPresentFence = -1;
-            return;
-        }
-
-        ReturnData& data = found->second;
-
-        *outPresentFence = data.presentFence;
-        data.presentFence = -1;
-    }
-
-    // Get what stage succeeded during PresentOrValidate: Present or Validate
-    void takePresentOrValidateStage(int64_t display, uint32_t* state) {
-        auto found = mReturnData.find(display);
-        if (found == mReturnData.end()) {
-            *state = static_cast<uint32_t>(-1);
-            return;
-        }
-        ReturnData& data = found->second;
-        *state = data.presentOrValidateState;
-    }
-
-    // Get the client target properties requested by hardware composer.
-    void takeClientTargetProperty(int64_t display, ClientTargetProperty* outClientTargetProperty,
-                                  float* outWhitePointNits) {
-        auto found = mReturnData.find(display);
-
-        // If not found, return the default values.
-        if (found == mReturnData.end()) {
-            outClientTargetProperty->pixelFormat = common::PixelFormat::RGBA_8888;
-            outClientTargetProperty->dataspace = Dataspace::UNKNOWN;
-            *outWhitePointNits = -1.f;
-            return;
-        }
-
-        ReturnData& data = found->second;
-        *outClientTargetProperty = data.clientTargetProperty;
-        *outWhitePointNits = data.clientTargetWhitePointNits;
-    }
-
-  private:
-    void resetData() {
-        mErrors.clear();
-
-        for (auto& data : mReturnData) {
-            if (data.second.presentFence >= 0) {
-                close(data.second.presentFence);
-            }
-            for (auto fence : data.second.releaseFences) {
-                if (fence >= 0) {
-                    close(fence);
-                }
-            }
-        }
-
-        mReturnData.clear();
-    }
-
-    void parseSetError(const CommandError& error) { mErrors.emplace_back(error); }
-
-    void parseSetChangedCompositionTypes(const ChangedCompositionTypes& changedCompositionTypes) {
-        auto& data = mReturnData[changedCompositionTypes.display];
-
-        data.changedLayers.reserve(changedCompositionTypes.layers.size());
-        data.compositionTypes.reserve(changedCompositionTypes.layers.size());
-        for (const auto& layer : changedCompositionTypes.layers) {
-            data.changedLayers.push_back(layer.layer);
-            data.compositionTypes.push_back(layer.composition);
-        }
-    }
-
-    void parseSetDisplayRequests(const DisplayRequest& displayRequest) {
-        auto& data = mReturnData[displayRequest.display];
-
-        data.displayRequests = displayRequest.mask;
-        data.requestedLayers.reserve(displayRequest.layerRequests.size());
-        data.requestMasks.reserve(displayRequest.layerRequests.size());
-        for (const auto& layerRequest : displayRequest.layerRequests) {
-            data.requestedLayers.push_back(layerRequest.layer);
-            data.requestMasks.push_back(layerRequest.mask);
-        }
-    }
-
-    void parseSetPresentFence(const PresentFence& presentFence) {
-        auto& data = mReturnData[presentFence.display];
-        if (data.presentFence >= 0) {
-            close(data.presentFence);
-        }
-        data.presentFence = dup(presentFence.fence.get());
-    }
-
-    void parseSetReleaseFences(const ReleaseFences& releaseFences) {
-        auto& data = mReturnData[releaseFences.display];
-        data.releasedLayers.reserve(releaseFences.layers.size());
-        data.releaseFences.reserve(releaseFences.layers.size());
-        for (const auto& layer : releaseFences.layers) {
-            data.releasedLayers.push_back(layer.layer);
-            data.releaseFences.push_back(dup(layer.fence.get()));
-        }
-    }
-
-    void parseSetPresentOrValidateDisplayResult(const PresentOrValidate& presentOrValidate) {
-        auto& data = mReturnData[presentOrValidate.display];
-        data.presentOrValidateState =
-                presentOrValidate.result == PresentOrValidate::Result::Presented ? 1 : 0;
-    }
-
-    void parseSetClientTargetProperty(const ClientTargetPropertyWithNits& clientTargetProperty) {
-        auto& data = mReturnData[clientTargetProperty.display];
-        data.clientTargetProperty.pixelFormat =
-                clientTargetProperty.clientTargetProperty.pixelFormat;
-        data.clientTargetProperty.dataspace = clientTargetProperty.clientTargetProperty.dataspace;
-        data.clientTargetWhitePointNits = clientTargetProperty.whitePointNits;
-    }
-
-    struct ReturnData {
-        int32_t displayRequests = 0;
-
-        std::vector<int64_t> changedLayers;
-        std::vector<Composition> compositionTypes;
-
-        std::vector<int64_t> requestedLayers;
-        std::vector<uint32_t> requestMasks;
-
-        int presentFence = -1;
-
-        std::vector<int64_t> releasedLayers;
-        std::vector<int> releaseFences;
-
-        uint32_t presentOrValidateState;
-
-        ClientTargetProperty clientTargetProperty{common::PixelFormat::RGBA_8888,
-                                                  Dataspace::UNKNOWN};
-        float clientTargetWhitePointNits = -1.f;
-    };
-
-    std::vector<CommandError> mErrors;
-    std::unordered_map<int64_t, ReturnData> mReturnData;
-};
-
-}  // namespace aidl::android::hardware::graphics::composer3