hwc: add vendor composer service [1/3]

PD#SWPL-18099

Problem:
When playing a 4k video and press back in YouTube, SurfaceView will not
be destroyed. And in composer service process, there is a composerLayer.
CompserLayer has a ComposerHandleCache which will hold the graphic
buffer handles cached in it and lead to ion orphaned memory.

Solution:
Add vendor composer service.

Verify:
Verify on newton

Change-Id: Ia7cac783941354ada82639990eadadac38603dc8
Signed-off-by: baocheng sun <baocheng.sun@amlogic.com>

18 files changed, 3824 insertions, 0 deletions

diff --git a/service/2.1/utils/hal/Android.bp b/service/2.1/utils/hal/Android.bp
new file mode 100644
index 0000000..7a501fc
--- a/dev/null
+++ b/service/2.1/utils/hal/Android.bp
@@ -0,0 +1,39 @@
+//
+// Copyright (C) 2018 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.
+
+cc_library_headers {
+    name: "android.hardware.graphics.composer@2.1-hal",
+    defaults: ["hidl_defaults"],
+    vendor_available: true,
+    shared_libs: [
+        "android.hardware.graphics.composer@2.1",
+        "android.hardware.graphics.mapper@2.0",
+        "android.hardware.graphics.mapper@3.0",
+        "libhardware", // TODO remove hwcomposer2.h dependency
+    ],
+    export_shared_lib_headers: [
+        "android.hardware.graphics.composer@2.1",
+        "android.hardware.graphics.mapper@2.0",
+        "android.hardware.graphics.mapper@3.0",
+        "libhardware",
+    ],
+    header_libs: [
+        "android.hardware.graphics.composer@2.1-command-buffer",
+    ],
+    export_header_lib_headers: [
+        "android.hardware.graphics.composer@2.1-command-buffer",
+    ],
+    export_include_dirs: ["include"],
+}
diff --git a/service/2.1/utils/hal/include/composer-hal/2.1/Composer.h b/service/2.1/utils/hal/include/composer-hal/2.1/Composer.h
new file mode 100644
index 0000000..90d9b98
--- a/dev/null
+++ b/service/2.1/utils/hal/include/composer-hal/2.1/Composer.h
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2016 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
+
+#ifndef LOG_TAG
+#warning "Composer.h included without LOG_TAG"
+#endif
+
+#include <array>
+#include <chrono>
+#include <condition_variable>
+#include <memory>
+#include <mutex>
+#include <vector>
+
+#include <android/hardware/graphics/composer/2.1/IComposer.h>
+#include <android/hardware/graphics/composer/2.1/IComposerClient.h>
+#include <composer-hal/2.1/ComposerClient.h>
+#include <composer-hal/2.1/ComposerHal.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_1 {
+namespace hal {
+
+namespace detail {
+
+// ComposerImpl implements V2_*::IComposer on top of V2_*::ComposerHal
+template <typename Interface, typename Hal>
+class ComposerImpl : public Interface {
+   public:
+    static std::unique_ptr<ComposerImpl> create(std::unique_ptr<Hal> hal) {
+        return std::make_unique<ComposerImpl>(std::move(hal));
+    }
+
+    ComposerImpl(std::unique_ptr<Hal> hal) : mHal(std::move(hal)) {}
+
+    // IComposer 2.1 interface
+
+    Return<void> getCapabilities(IComposer::getCapabilities_cb hidl_cb) override {
+        const std::array<IComposer::Capability, 3> all_caps = {{
+            IComposer::Capability::SIDEBAND_STREAM,
+            IComposer::Capability::SKIP_CLIENT_COLOR_TRANSFORM,
+            IComposer::Capability::PRESENT_FENCE_IS_NOT_RELIABLE,
+        }};
+
+        std::vector<IComposer::Capability> caps;
+        for (auto cap : all_caps) {
+            if (mHal->hasCapability(static_cast<hwc2_capability_t>(cap))) {
+                caps.push_back(cap);
+            }
+        }
+
+        hidl_vec<IComposer::Capability> caps_reply;
+        caps_reply.setToExternal(caps.data(), caps.size());
+        hidl_cb(caps_reply);
+        return Void();
+    }
+
+    Return<void> dumpDebugInfo(IComposer::dumpDebugInfo_cb hidl_cb) override {
+        hidl_cb(mHal->dumpDebugInfo());
+        return Void();
+    }
+
+    Return<void> createClient(IComposer::createClient_cb hidl_cb) override {
+        std::unique_lock<std::mutex> lock(mClientMutex);
+        bool destroyed = waitForClientDestroyedLocked(lock);
+        if (!destroyed) {
+            hidl_cb(Error::NO_RESOURCES, nullptr);
+            return Void();
+        }
+
+        sp<IComposerClient> client = createClient();
+        if (!client) {
+            hidl_cb(Error::NO_RESOURCES, nullptr);
+            return Void();
+        }
+
+        mClient = client;
+        hidl_cb(Error::NONE, client);
+        return Void();
+    }
+
+   protected:
+    bool waitForClientDestroyedLocked(std::unique_lock<std::mutex>& lock) {
+        if (mClient != nullptr) {
+            using namespace std::chrono_literals;
+
+            // In surface flinger we delete a composer client on one thread and
+            // then create a new client on another thread. Although surface
+            // flinger ensures the calls are made in that sequence (destroy and
+            // then create), sometimes the calls land in the composer service
+            // inverted (create and then destroy). Wait for a brief period to
+            // see if the existing client is destroyed.
+            ALOGD("waiting for previous client to be destroyed");
+            mClientDestroyedCondition.wait_for(lock, 1s,
+                                               [this]() -> bool { return mClient == nullptr; });
+            if (mClient != nullptr) {
+                ALOGD("previous client was not destroyed");
+            }
+        }
+
+        return mClient == nullptr;
+    }
+
+    void onClientDestroyed() {
+        std::lock_guard<std::mutex> lock(mClientMutex);
+        mClient.clear();
+        mClientDestroyedCondition.notify_all();
+    }
+
+    virtual IComposerClient* createClient() {
+        auto client = ComposerClient::create(mHal.get());
+        if (!client) {
+            return nullptr;
+        }
+
+        auto clientDestroyed = [this]() { onClientDestroyed(); };
+        client->setOnClientDestroyed(clientDestroyed);
+
+        return client.release();
+    }
+
+    const std::unique_ptr<Hal> mHal;
+
+    std::mutex mClientMutex;
+    wp<IComposerClient> mClient;
+    std::condition_variable mClientDestroyedCondition;
+};
+
+}  // namespace detail
+
+using Composer = detail::ComposerImpl<IComposer, ComposerHal>;
+
+}  // namespace hal
+}  // namespace V2_1
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.1/utils/hal/include/composer-hal/2.1/ComposerClient.h b/service/2.1/utils/hal/include/composer-hal/2.1/ComposerClient.h
new file mode 100644
index 0000000..095189f
--- a/dev/null
+++ b/service/2.1/utils/hal/include/composer-hal/2.1/ComposerClient.h
@@ -0,0 +1,397 @@
+/*
+ * Copyright 2018 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
+
+#ifndef LOG_TAG
+#warning "ComposerClient.h included without LOG_TAG"
+#endif
+
+#include <memory>
+#include <mutex>
+#include <vector>
+
+#include <android/hardware/graphics/composer/2.1/IComposerClient.h>
+#include <composer-hal/2.1/ComposerCommandEngine.h>
+#include <composer-hal/2.1/ComposerHal.h>
+#include <composer-hal/2.1/ComposerResources.h>
+#include <log/log.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_1 {
+namespace hal {
+
+namespace detail {
+
+// ComposerClientImpl implements V2_*::IComposerClient on top of V2_*::ComposerHal
+template <typename Interface, typename Hal>
+class ComposerClientImpl : public Interface {
+   public:
+    static std::unique_ptr<ComposerClientImpl> create(Hal* hal) {
+        auto client = std::make_unique<ComposerClientImpl>(hal);
+        return client->init() ? std::move(client) : nullptr;
+    }
+
+    ComposerClientImpl(Hal* hal) : mHal(hal) {}
+
+    virtual ~ComposerClientImpl() {
+        // not initialized
+        if (!mCommandEngine) {
+            return;
+        }
+
+        ALOGD("destroying composer client");
+
+        mHal->unregisterEventCallback();
+        destroyResources();
+        if (mOnClientDestroyed) {
+            mOnClientDestroyed();
+        }
+
+        ALOGD("removed composer client");
+    }
+
+    bool init() {
+        mResources = createResources();
+        if (!mResources) {
+            ALOGE("failed to create composer resources");
+            return false;
+        }
+
+        mCommandEngine = createCommandEngine();
+
+        return true;
+    }
+
+    void setOnClientDestroyed(std::function<void()> onClientDestroyed) {
+        mOnClientDestroyed = onClientDestroyed;
+    }
+
+    // IComposerClient 2.1 interface
+
+    class HalEventCallback : public Hal::EventCallback {
+       public:
+        HalEventCallback(const sp<IComposerCallback> callback, ComposerResources* resources)
+            : mCallback(callback), mResources(resources) {}
+
+        void onHotplug(Display display, IComposerCallback::Connection connected) {
+            if (connected == IComposerCallback::Connection::CONNECTED) {
+                mResources->addPhysicalDisplay(display);
+            } else if (connected == IComposerCallback::Connection::DISCONNECTED) {
+                mResources->removeDisplay(display);
+            }
+
+            auto ret = mCallback->onHotplug(display, connected);
+            ALOGE_IF(!ret.isOk(), "failed to send onHotplug: %s", ret.description().c_str());
+        }
+
+        void onRefresh(Display display) {
+            mResources->setDisplayMustValidateState(display, true);
+            auto ret = mCallback->onRefresh(display);
+            ALOGE_IF(!ret.isOk(), "failed to send onRefresh: %s", ret.description().c_str());
+        }
+
+        void onVsync(Display display, int64_t timestamp) {
+            auto ret = mCallback->onVsync(display, timestamp);
+            ALOGE_IF(!ret.isOk(), "failed to send onVsync: %s", ret.description().c_str());
+        }
+
+       protected:
+        const sp<IComposerCallback> mCallback;
+        ComposerResources* const mResources;
+    };
+
+    Return<void> registerCallback(const sp<IComposerCallback>& callback) override {
+        // no locking as we require this function to be called only once
+        mHalEventCallback = std::make_unique<HalEventCallback>(callback, mResources.get());
+        mHal->registerEventCallback(mHalEventCallback.get());
+        return Void();
+    }
+
+    Return<uint32_t> getMaxVirtualDisplayCount() override {
+        return mHal->getMaxVirtualDisplayCount();
+    }
+
+    Return<void> createVirtualDisplay(uint32_t width, uint32_t height, PixelFormat formatHint,
+                                      uint32_t outputBufferSlotCount,
+                                      IComposerClient::createVirtualDisplay_cb hidl_cb) override {
+        Display display = 0;
+        Error err = mHal->createVirtualDisplay(width, height, &formatHint, &display);
+        if (err == Error::NONE) {
+            mResources->addVirtualDisplay(display, outputBufferSlotCount);
+        }
+
+        hidl_cb(err, display, formatHint);
+        return Void();
+    }
+
+    Return<Error> destroyVirtualDisplay(Display display) override {
+        Error err = mHal->destroyVirtualDisplay(display);
+        if (err == Error::NONE) {
+            mResources->removeDisplay(display);
+        }
+
+        return err;
+    }
+
+    Return<void> createLayer(Display display, uint32_t bufferSlotCount,
+                             IComposerClient::createLayer_cb hidl_cb) override {
+        Layer layer = 0;
+        Error err = mHal->createLayer(display, &layer);
+        if (err == Error::NONE) {
+            err = mResources->addLayer(display, layer, bufferSlotCount);
+            if (err != Error::NONE) {
+                // The display entry may have already been removed by onHotplug.
+                // Note: We do not destroy the layer on this error as the hotplug
+                // disconnect invalidates the display id. The implementation should
+                // ensure all layers for the display are destroyed.
+                layer = 0;
+            }
+        }
+
+        hidl_cb(err, layer);
+        return Void();
+    }
+
+    Return<Error> destroyLayer(Display display, Layer layer) override {
+        Error err = mHal->destroyLayer(display, layer);
+        if (err == Error::NONE) {
+            mResources->removeLayer(display, layer);
+        }
+
+        return err;
+    }
+
+    Return<void> getActiveConfig(Display display,
+                                 IComposerClient::getActiveConfig_cb hidl_cb) override {
+        Config config = 0;
+        Error err = mHal->getActiveConfig(display, &config);
+        hidl_cb(err, config);
+        return Void();
+    }
+
+    Return<Error> getClientTargetSupport(Display display, uint32_t width, uint32_t height,
+                                         PixelFormat format, Dataspace dataspace) override {
+        Error err = mHal->getClientTargetSupport(display, width, height, format, dataspace);
+        return err;
+    }
+
+    Return<void> getColorModes(Display display,
+                               IComposerClient::getColorModes_cb hidl_cb) override {
+        hidl_vec<ColorMode> modes;
+        Error err = mHal->getColorModes(display, &modes);
+        hidl_cb(err, modes);
+        return Void();
+    }
+
+    Return<void> getDisplayAttribute(Display display, Config config,
+                                     IComposerClient::Attribute attribute,
+                                     IComposerClient::getDisplayAttribute_cb hidl_cb) override {
+        int32_t value = 0;
+        Error err = mHal->getDisplayAttribute(display, config, attribute, &value);
+        hidl_cb(err, value);
+        return Void();
+    }
+
+    Return<void> getDisplayConfigs(Display display,
+                                   IComposerClient::getDisplayConfigs_cb hidl_cb) override {
+        hidl_vec<Config> configs;
+        Error err = mHal->getDisplayConfigs(display, &configs);
+        hidl_cb(err, configs);
+        return Void();
+    }
+
+    Return<void> getDisplayName(Display display,
+                                IComposerClient::getDisplayName_cb hidl_cb) override {
+        hidl_string name;
+        Error err = mHal->getDisplayName(display, &name);
+        hidl_cb(err, name);
+        return Void();
+    }
+
+    Return<void> getDisplayType(Display display,
+                                IComposerClient::getDisplayType_cb hidl_cb) override {
+        IComposerClient::DisplayType type = IComposerClient::DisplayType::INVALID;
+        Error err = mHal->getDisplayType(display, &type);
+        hidl_cb(err, type);
+        return Void();
+    }
+
+    Return<void> getDozeSupport(Display display,
+                                IComposerClient::getDozeSupport_cb hidl_cb) override {
+        bool support = false;
+        Error err = mHal->getDozeSupport(display, &support);
+        hidl_cb(err, support);
+        return Void();
+    }
+
+    Return<void> getHdrCapabilities(Display display,
+                                    IComposerClient::getHdrCapabilities_cb hidl_cb) override {
+        hidl_vec<Hdr> types;
+        float max_lumi = 0.0f;
+        float max_avg_lumi = 0.0f;
+        float min_lumi = 0.0f;
+        Error err = mHal->getHdrCapabilities(display, &types, &max_lumi, &max_avg_lumi, &min_lumi);
+        hidl_cb(err, types, max_lumi, max_avg_lumi, min_lumi);
+        return Void();
+    }
+
+    Return<Error> setActiveConfig(Display display, Config config) override {
+        Error err = mHal->setActiveConfig(display, config);
+        return err;
+    }
+
+    Return<Error> setColorMode(Display display, ColorMode mode) override {
+        Error err = mHal->setColorMode(display, mode);
+        return err;
+    }
+
+    Return<Error> setPowerMode(Display display, IComposerClient::PowerMode mode) override {
+        Error err = mHal->setPowerMode(display, mode);
+        return err;
+    }
+
+    Return<Error> setVsyncEnabled(Display display, IComposerClient::Vsync enabled) override {
+        Error err = mHal->setVsyncEnabled(display, enabled);
+        return err;
+    }
+
+    Return<Error> setClientTargetSlotCount(Display display,
+                                           uint32_t clientTargetSlotCount) override {
+        return mResources->setDisplayClientTargetCacheSize(display, clientTargetSlotCount);
+    }
+
+    Return<Error> setInputCommandQueue(const MQDescriptorSync<uint32_t>& descriptor) override {
+        std::lock_guard<std::mutex> lock(mCommandEngineMutex);
+        return mCommandEngine->setInputMQDescriptor(descriptor) ? Error::NONE : Error::NO_RESOURCES;
+    }
+
+    Return<void> getOutputCommandQueue(IComposerClient::getOutputCommandQueue_cb hidl_cb) override {
+        // no locking as we require this function to be called inside
+        // executeCommands_cb
+        auto outDescriptor = mCommandEngine->getOutputMQDescriptor();
+        if (outDescriptor) {
+            hidl_cb(Error::NONE, *outDescriptor);
+        } else {
+            hidl_cb(Error::NO_RESOURCES, CommandQueueType::Descriptor());
+        }
+
+        return Void();
+    }
+
+    Return<void> executeCommands(uint32_t inLength, const hidl_vec<hidl_handle>& inHandles,
+                                 IComposerClient::executeCommands_cb hidl_cb) override {
+        std::lock_guard<std::mutex> lock(mCommandEngineMutex);
+        bool outChanged = false;
+        uint32_t outLength = 0;
+        hidl_vec<hidl_handle> outHandles;
+        Error error =
+            mCommandEngine->execute(inLength, inHandles, &outChanged, &outLength, &outHandles);
+
+        hidl_cb(error, outChanged, outLength, outHandles);
+
+        mCommandEngine->reset();
+
+        return Void();
+    }
+
+   protected:
+    virtual std::unique_ptr<ComposerResources> createResources() {
+        return ComposerResources::create();
+    }
+
+    virtual std::unique_ptr<ComposerCommandEngine> createCommandEngine() {
+        return std::make_unique<ComposerCommandEngine>(mHal, mResources.get());
+    }
+
+    void destroyResources() {
+        // We want to call hwc2_close here (and move hwc2_open to the
+        // constructor), with the assumption that hwc2_close would
+        //
+        //  - clean up all resources owned by the client
+        //  - make sure all displays are blank (since there is no layer)
+        //
+        // But since SF used to crash at this point, different hwcomposer2
+        // implementations behave differently on hwc2_close.  Our only portable
+        // choice really is to abort().  But that is not an option anymore
+        // because we might also have VTS or VR as clients that can come and go.
+        //
+        // Below we manually clean all resources (layers and virtual
+        // displays), and perform a presentDisplay afterwards.
+        mResources->clear([this](Display display, bool isVirtual, const std::vector<Layer> layers) {
+            ALOGW("destroying client resources for display %" PRIu64, display);
+
+            for (auto layer : layers) {
+                mHal->destroyLayer(display, layer);
+            }
+
+            if (isVirtual) {
+                mHal->destroyVirtualDisplay(display);
+            } else {
+                ALOGW("performing a final presentDisplay");
+
+                std::vector<Layer> changedLayers;
+                std::vector<IComposerClient::Composition> compositionTypes;
+                uint32_t displayRequestMask = 0;
+                std::vector<Layer> requestedLayers;
+                std::vector<uint32_t> requestMasks;
+                mHal->validateDisplay(display, &changedLayers, &compositionTypes,
+                                      &displayRequestMask, &requestedLayers, &requestMasks);
+
+                mHal->acceptDisplayChanges(display);
+
+                int32_t presentFence = -1;
+                std::vector<Layer> releasedLayers;
+                std::vector<int32_t> releaseFences;
+                mHal->presentDisplay(display, &presentFence, &releasedLayers, &releaseFences);
+                if (presentFence >= 0) {
+                    close(presentFence);
+                }
+                for (auto fence : releaseFences) {
+                    if (fence >= 0) {
+                        close(fence);
+                    }
+                }
+            }
+        });
+
+        mResources.reset();
+    }
+
+    Hal* const mHal;
+
+    std::unique_ptr<ComposerResources> mResources;
+
+    std::mutex mCommandEngineMutex;
+    std::unique_ptr<ComposerCommandEngine> mCommandEngine;
+
+    std::function<void()> mOnClientDestroyed;
+    std::unique_ptr<HalEventCallback> mHalEventCallback;
+};
+
+}  // namespace detail
+
+using ComposerClient = detail::ComposerClientImpl<IComposerClient, ComposerHal>;
+
+}  // namespace hal
+}  // namespace V2_1
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.1/utils/hal/include/composer-hal/2.1/ComposerCommandEngine.h b/service/2.1/utils/hal/include/composer-hal/2.1/ComposerCommandEngine.h
new file mode 100644
index 0000000..d87110a
--- a/dev/null
+++ b/service/2.1/utils/hal/include/composer-hal/2.1/ComposerCommandEngine.h
@@ -0,0 +1,598 @@
+/*
+ * Copyright 2018 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
+
+#ifndef LOG_TAG
+#warning "ComposerCommandEngine.h included without LOG_TAG"
+#endif
+
+#include <vector>
+
+#include <composer-command-buffer/2.1/ComposerCommandBuffer.h>
+#include <composer-hal/2.1/ComposerHal.h>
+#include <composer-hal/2.1/ComposerResources.h>
+// TODO remove hwcomposer_defs.h dependency
+#include <hardware/hwcomposer_defs.h>
+#include <log/log.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_1 {
+namespace hal {
+
+// TODO own a CommandReaderBase rather than subclassing
+class ComposerCommandEngine : protected CommandReaderBase {
+   public:
+    ComposerCommandEngine(ComposerHal* hal, ComposerResources* resources)
+        : mHal(hal), mResources(resources) {}
+
+    virtual ~ComposerCommandEngine() = default;
+
+    bool setInputMQDescriptor(const MQDescriptorSync<uint32_t>& descriptor) {
+        return setMQDescriptor(descriptor);
+    }
+
+    Error execute(uint32_t inLength, const hidl_vec<hidl_handle>& inHandles, bool* outQueueChanged,
+                  uint32_t* outCommandLength, hidl_vec<hidl_handle>* outCommandHandles) {
+        if (!readQueue(inLength, inHandles)) {
+            return Error::BAD_PARAMETER;
+        }
+
+        IComposerClient::Command command;
+        uint16_t length = 0;
+        while (!isEmpty()) {
+            if (!beginCommand(&command, &length)) {
+                break;
+            }
+
+            bool parsed = executeCommand(command, length);
+            endCommand();
+
+            if (!parsed) {
+                ALOGE("failed to parse command 0x%x, length %" PRIu16, command, length);
+                break;
+            }
+        }
+
+        if (!isEmpty()) {
+            return Error::BAD_PARAMETER;
+        }
+
+        return mWriter.writeQueue(outQueueChanged, outCommandLength, outCommandHandles)
+                   ? Error::NONE
+                   : Error::NO_RESOURCES;
+    }
+
+    const MQDescriptorSync<uint32_t>* getOutputMQDescriptor() { return mWriter.getMQDescriptor(); }
+
+    void reset() {
+        CommandReaderBase::reset();
+        mWriter.reset();
+    }
+
+   protected:
+    virtual bool executeCommand(IComposerClient::Command command, uint16_t length) {
+        switch (command) {
+            case IComposerClient::Command::SELECT_DISPLAY:
+                return executeSelectDisplay(length);
+            case IComposerClient::Command::SELECT_LAYER:
+                return executeSelectLayer(length);
+            case IComposerClient::Command::SET_COLOR_TRANSFORM:
+                return executeSetColorTransform(length);
+            case IComposerClient::Command::SET_CLIENT_TARGET:
+                return executeSetClientTarget(length);
+            case IComposerClient::Command::SET_OUTPUT_BUFFER:
+                return executeSetOutputBuffer(length);
+            case IComposerClient::Command::VALIDATE_DISPLAY:
+                return executeValidateDisplay(length);
+            case IComposerClient::Command::PRESENT_OR_VALIDATE_DISPLAY:
+                return executePresentOrValidateDisplay(length);
+            case IComposerClient::Command::ACCEPT_DISPLAY_CHANGES:
+                return executeAcceptDisplayChanges(length);
+            case IComposerClient::Command::PRESENT_DISPLAY:
+                return executePresentDisplay(length);
+            case IComposerClient::Command::SET_LAYER_CURSOR_POSITION:
+                return executeSetLayerCursorPosition(length);
+            case IComposerClient::Command::SET_LAYER_BUFFER:
+                return executeSetLayerBuffer(length);
+            case IComposerClient::Command::SET_LAYER_SURFACE_DAMAGE:
+                return executeSetLayerSurfaceDamage(length);
+            case IComposerClient::Command::SET_LAYER_BLEND_MODE:
+                return executeSetLayerBlendMode(length);
+            case IComposerClient::Command::SET_LAYER_COLOR:
+                return executeSetLayerColor(length);
+            case IComposerClient::Command::SET_LAYER_COMPOSITION_TYPE:
+                return executeSetLayerCompositionType(length);
+            case IComposerClient::Command::SET_LAYER_DATASPACE:
+                return executeSetLayerDataspace(length);
+            case IComposerClient::Command::SET_LAYER_DISPLAY_FRAME:
+                return executeSetLayerDisplayFrame(length);
+            case IComposerClient::Command::SET_LAYER_PLANE_ALPHA:
+                return executeSetLayerPlaneAlpha(length);
+            case IComposerClient::Command::SET_LAYER_SIDEBAND_STREAM:
+                return executeSetLayerSidebandStream(length);
+            case IComposerClient::Command::SET_LAYER_SOURCE_CROP:
+                return executeSetLayerSourceCrop(length);
+            case IComposerClient::Command::SET_LAYER_TRANSFORM:
+                return executeSetLayerTransform(length);
+            case IComposerClient::Command::SET_LAYER_VISIBLE_REGION:
+                return executeSetLayerVisibleRegion(length);
+            case IComposerClient::Command::SET_LAYER_Z_ORDER:
+                return executeSetLayerZOrder(length);
+            default:
+                return false;
+        }
+    }
+
+    bool executeSelectDisplay(uint16_t length) {
+        if (length != CommandWriterBase::kSelectDisplayLength) {
+            return false;
+        }
+
+        mCurrentDisplay = read64();
+        mWriter.selectDisplay(mCurrentDisplay);
+
+        return true;
+    }
+
+    bool executeSelectLayer(uint16_t length) {
+        if (length != CommandWriterBase::kSelectLayerLength) {
+            return false;
+        }
+
+        mCurrentLayer = read64();
+
+        return true;
+    }
+
+    bool executeSetColorTransform(uint16_t length) {
+        if (length != CommandWriterBase::kSetColorTransformLength) {
+            return false;
+        }
+
+        float matrix[16];
+        for (int i = 0; i < 16; i++) {
+            matrix[i] = readFloat();
+        }
+        auto transform = readSigned();
+
+        auto err = mHal->setColorTransform(mCurrentDisplay, matrix, transform);
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetClientTarget(uint16_t length) {
+        // 4 parameters followed by N rectangles
+        if ((length - 4) % 4 != 0) {
+            return false;
+        }
+
+        bool useCache = false;
+        auto slot = read();
+        auto rawHandle = readHandle(&useCache);
+        auto fence = readFence();
+        auto dataspace = readSigned();
+        auto damage = readRegion((length - 4) / 4);
+        bool closeFence = true;
+
+        const native_handle_t* clientTarget;
+        ComposerResources::ReplacedBufferHandle replacedClientTarget;
+        auto err = mResources->getDisplayClientTarget(mCurrentDisplay, slot, useCache, rawHandle,
+                                                      &clientTarget, &replacedClientTarget);
+        if (err == Error::NONE) {
+            err = mHal->setClientTarget(mCurrentDisplay, clientTarget, fence, dataspace, damage);
+            if (err == Error::NONE) {
+                closeFence = false;
+            }
+        }
+        if (closeFence) {
+            close(fence);
+        }
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetOutputBuffer(uint16_t length) {
+        if (length != CommandWriterBase::kSetOutputBufferLength) {
+            return false;
+        }
+
+        bool useCache = false;
+        auto slot = read();
+        auto rawhandle = readHandle(&useCache);
+        auto fence = readFence();
+        bool closeFence = true;
+
+        const native_handle_t* outputBuffer;
+        ComposerResources::ReplacedBufferHandle replacedOutputBuffer;
+        auto err = mResources->getDisplayOutputBuffer(mCurrentDisplay, slot, useCache, rawhandle,
+                                                      &outputBuffer, &replacedOutputBuffer);
+        if (err == Error::NONE) {
+            err = mHal->setOutputBuffer(mCurrentDisplay, outputBuffer, fence);
+            if (err == Error::NONE) {
+                closeFence = false;
+            }
+        }
+        if (closeFence) {
+            close(fence);
+        }
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeValidateDisplay(uint16_t length) {
+        if (length != CommandWriterBase::kValidateDisplayLength) {
+            return false;
+        }
+
+        std::vector<Layer> changedLayers;
+        std::vector<IComposerClient::Composition> compositionTypes;
+        uint32_t displayRequestMask = 0x0;
+        std::vector<Layer> requestedLayers;
+        std::vector<uint32_t> requestMasks;
+
+        auto err = mHal->validateDisplay(mCurrentDisplay, &changedLayers, &compositionTypes,
+                                         &displayRequestMask, &requestedLayers, &requestMasks);
+        mResources->setDisplayMustValidateState(mCurrentDisplay, false);
+        if (err == Error::NONE) {
+            mWriter.setChangedCompositionTypes(changedLayers, compositionTypes);
+            mWriter.setDisplayRequests(displayRequestMask, requestedLayers, requestMasks);
+        } else {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executePresentOrValidateDisplay(uint16_t length) {
+        if (length != CommandWriterBase::kPresentOrValidateDisplayLength) {
+            return false;
+        }
+
+        // First try to Present as is.
+        if (mHal->hasCapability(HWC2_CAPABILITY_SKIP_VALIDATE)) {
+            int presentFence = -1;
+            std::vector<Layer> layers;
+            std::vector<int> fences;
+            auto err = mResources->mustValidateDisplay(mCurrentDisplay)
+                           ? Error::NOT_VALIDATED
+                           : mHal->presentDisplay(mCurrentDisplay, &presentFence, &layers, &fences);
+            if (err == Error::NONE) {
+                mWriter.setPresentOrValidateResult(1);
+                mWriter.setPresentFence(presentFence);
+                mWriter.setReleaseFences(layers, fences);
+                return true;
+            }
+        }
+
+        // Present has failed. We need to fallback to validate
+        std::vector<Layer> changedLayers;
+        std::vector<IComposerClient::Composition> compositionTypes;
+        uint32_t displayRequestMask = 0x0;
+        std::vector<Layer> requestedLayers;
+        std::vector<uint32_t> requestMasks;
+
+        auto err = mHal->validateDisplay(mCurrentDisplay, &changedLayers, &compositionTypes,
+                                         &displayRequestMask, &requestedLayers, &requestMasks);
+        mResources->setDisplayMustValidateState(mCurrentDisplay, false);
+        if (err == Error::NONE) {
+            mWriter.setPresentOrValidateResult(0);
+            mWriter.setChangedCompositionTypes(changedLayers, compositionTypes);
+            mWriter.setDisplayRequests(displayRequestMask, requestedLayers, requestMasks);
+        } else {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeAcceptDisplayChanges(uint16_t length) {
+        if (length != CommandWriterBase::kAcceptDisplayChangesLength) {
+            return false;
+        }
+
+        auto err = mHal->acceptDisplayChanges(mCurrentDisplay);
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executePresentDisplay(uint16_t length) {
+        if (length != CommandWriterBase::kPresentDisplayLength) {
+            return false;
+        }
+
+        int presentFence = -1;
+        std::vector<Layer> layers;
+        std::vector<int> fences;
+        auto err = mHal->presentDisplay(mCurrentDisplay, &presentFence, &layers, &fences);
+        if (err == Error::NONE) {
+            mWriter.setPresentFence(presentFence);
+            mWriter.setReleaseFences(layers, fences);
+        } else {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerCursorPosition(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerCursorPositionLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerCursorPosition(mCurrentDisplay, mCurrentLayer, readSigned(),
+                                                readSigned());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerBuffer(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerBufferLength) {
+            return false;
+        }
+
+        bool useCache = false;
+        auto slot = read();
+        auto rawHandle = readHandle(&useCache);
+        auto fence = readFence();
+        bool closeFence = true;
+
+        const native_handle_t* buffer;
+        ComposerResources::ReplacedBufferHandle replacedBuffer;
+        auto err = mResources->getLayerBuffer(mCurrentDisplay, mCurrentLayer, slot, useCache,
+                                              rawHandle, &buffer, &replacedBuffer);
+        if (err == Error::NONE) {
+            err = mHal->setLayerBuffer(mCurrentDisplay, mCurrentLayer, buffer, fence);
+            if (err == Error::NONE) {
+                closeFence = false;
+            }
+        }
+        if (closeFence) {
+            close(fence);
+        }
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerSurfaceDamage(uint16_t length) {
+        // N rectangles
+        if (length % 4 != 0) {
+            return false;
+        }
+
+        auto damage = readRegion(length / 4);
+        auto err = mHal->setLayerSurfaceDamage(mCurrentDisplay, mCurrentLayer, damage);
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerBlendMode(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerBlendModeLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerBlendMode(mCurrentDisplay, mCurrentLayer, readSigned());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerColor(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerColorLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerColor(mCurrentDisplay, mCurrentLayer, readColor());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerCompositionType(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerCompositionTypeLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerCompositionType(mCurrentDisplay, mCurrentLayer, readSigned());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerDataspace(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerDataspaceLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerDataspace(mCurrentDisplay, mCurrentLayer, readSigned());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerDisplayFrame(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerDisplayFrameLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerDisplayFrame(mCurrentDisplay, mCurrentLayer, readRect());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerPlaneAlpha(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerPlaneAlphaLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerPlaneAlpha(mCurrentDisplay, mCurrentLayer, readFloat());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerSidebandStream(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerSidebandStreamLength) {
+            return false;
+        }
+
+        auto rawHandle = readHandle();
+
+        const native_handle_t* stream;
+        ComposerResources::ReplacedStreamHandle replacedStream;
+        auto err = mResources->getLayerSidebandStream(mCurrentDisplay, mCurrentLayer, rawHandle,
+                                                      &stream, &replacedStream);
+        if (err == Error::NONE) {
+            err = mHal->setLayerSidebandStream(mCurrentDisplay, mCurrentLayer, stream);
+        }
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerSourceCrop(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerSourceCropLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerSourceCrop(mCurrentDisplay, mCurrentLayer, readFRect());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerTransform(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerTransformLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerTransform(mCurrentDisplay, mCurrentLayer, readSigned());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerVisibleRegion(uint16_t length) {
+        // N rectangles
+        if (length % 4 != 0) {
+            return false;
+        }
+
+        auto region = readRegion(length / 4);
+        auto err = mHal->setLayerVisibleRegion(mCurrentDisplay, mCurrentLayer, region);
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    bool executeSetLayerZOrder(uint16_t length) {
+        if (length != CommandWriterBase::kSetLayerZOrderLength) {
+            return false;
+        }
+
+        auto err = mHal->setLayerZOrder(mCurrentDisplay, mCurrentLayer, read());
+        if (err != Error::NONE) {
+            mWriter.setError(getCommandLoc(), err);
+        }
+
+        return true;
+    }
+
+    hwc_rect_t readRect() {
+        return hwc_rect_t{
+            readSigned(), readSigned(), readSigned(), readSigned(),
+        };
+    }
+
+    std::vector<hwc_rect_t> readRegion(size_t count) {
+        std::vector<hwc_rect_t> region;
+        region.reserve(count);
+        while (count > 0) {
+            region.emplace_back(readRect());
+            count--;
+        }
+
+        return region;
+    }
+
+    hwc_frect_t readFRect() {
+        return hwc_frect_t{
+            readFloat(), readFloat(), readFloat(), readFloat(),
+        };
+    }
+
+    ComposerHal* mHal;
+    ComposerResources* mResources;
+
+    // 64KiB minus a small space for metadata such as read/write pointers
+    static constexpr size_t kWriterInitialSize = 64 * 1024 / sizeof(uint32_t) - 16;
+    CommandWriterBase mWriter{kWriterInitialSize};
+
+    Display mCurrentDisplay = 0;
+    Layer mCurrentLayer = 0;
+};
+
+}  // namespace hal
+}  // namespace V2_1
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.1/utils/hal/include/composer-hal/2.1/ComposerHal.h b/service/2.1/utils/hal/include/composer-hal/2.1/ComposerHal.h
new file mode 100644
index 0000000..c9793fd
--- a/dev/null
+++ b/service/2.1/utils/hal/include/composer-hal/2.1/ComposerHal.h
@@ -0,0 +1,137 @@
+/*
+ * Copyright 2018 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 <string>
+#include <vector>
+
+#include <android/hardware/graphics/composer/2.1/IComposer.h>
+#include <android/hardware/graphics/composer/2.1/IComposerClient.h>
+
+// TODO remove hwcomposer2.h dependency
+#define HWC2_INCLUDE_STRINGIFICATION
+#define HWC2_USE_CPP11
+#include <hardware/hwcomposer2.h>
+#undef HWC2_INCLUDE_STRINGIFICATION
+#undef HWC2_USE_CPP11
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_1 {
+namespace hal {
+
+using common::V1_0::ColorMode;
+using common::V1_0::ColorTransform;
+using common::V1_0::Dataspace;
+using common::V1_0::Hdr;
+using common::V1_0::PixelFormat;
+using common::V1_0::Transform;
+
+class ComposerHal {
+   public:
+    virtual ~ComposerHal() = default;
+
+    virtual bool hasCapability(hwc2_capability_t capability) = 0;
+
+    // dump the debug information
+    virtual std::string dumpDebugInfo() = 0;
+
+    class EventCallback {
+       public:
+        virtual ~EventCallback() = default;
+        virtual void onHotplug(Display display, IComposerCallback::Connection connected) = 0;
+        virtual void onRefresh(Display display) = 0;
+        virtual void onVsync(Display display, int64_t timestamp) = 0;
+    };
+
+    // Register the event callback object.  The event callback object is valid
+    // until it is unregistered.  A hotplug event must be generated for each
+    // connected physical display, before or after this function returns.
+    virtual void registerEventCallback(EventCallback* callback) = 0;
+
+    // Unregister the event callback object.  It must block if there is any
+    // callback in-flight.
+    virtual void unregisterEventCallback() = 0;
+
+    virtual uint32_t getMaxVirtualDisplayCount() = 0;
+    virtual Error createVirtualDisplay(uint32_t width, uint32_t height, PixelFormat* format,
+                                       Display* outDisplay) = 0;
+    virtual Error destroyVirtualDisplay(Display display) = 0;
+    virtual Error createLayer(Display display, Layer* outLayer) = 0;
+    virtual Error destroyLayer(Display display, Layer layer) = 0;
+
+    virtual Error getActiveConfig(Display display, Config* outConfig) = 0;
+    virtual Error getClientTargetSupport(Display display, uint32_t width, uint32_t height,
+                                         PixelFormat format, Dataspace dataspace) = 0;
+    virtual Error getColorModes(Display display, hidl_vec<ColorMode>* outModes) = 0;
+    virtual Error getDisplayAttribute(Display display, Config config,
+                                      IComposerClient::Attribute attribute, int32_t* outValue) = 0;
+    virtual Error getDisplayConfigs(Display display, hidl_vec<Config>* outConfigs) = 0;
+    virtual Error getDisplayName(Display display, hidl_string* outName) = 0;
+    virtual Error getDisplayType(Display display, IComposerClient::DisplayType* outType) = 0;
+    virtual Error getDozeSupport(Display display, bool* outSupport) = 0;
+    virtual Error getHdrCapabilities(Display display, hidl_vec<Hdr>* outTypes,
+                                     float* outMaxLuminance, float* outMaxAverageLuminance,
+                                     float* outMinLuminance) = 0;
+
+    virtual Error setActiveConfig(Display display, Config config) = 0;
+    virtual Error setColorMode(Display display, ColorMode mode) = 0;
+    virtual Error setPowerMode(Display display, IComposerClient::PowerMode mode) = 0;
+    virtual Error setVsyncEnabled(Display display, IComposerClient::Vsync enabled) = 0;
+
+    virtual Error setColorTransform(Display display, const float* matrix, int32_t hint) = 0;
+    virtual Error setClientTarget(Display display, buffer_handle_t target, int32_t acquireFence,
+                                  int32_t dataspace, const std::vector<hwc_rect_t>& damage) = 0;
+    virtual Error setOutputBuffer(Display display, buffer_handle_t buffer,
+                                  int32_t releaseFence) = 0;
+    virtual Error validateDisplay(Display display, std::vector<Layer>* outChangedLayers,
+                                  std::vector<IComposerClient::Composition>* outCompositionTypes,
+                                  uint32_t* outDisplayRequestMask,
+                                  std::vector<Layer>* outRequestedLayers,
+                                  std::vector<uint32_t>* outRequestMasks) = 0;
+    virtual Error acceptDisplayChanges(Display display) = 0;
+    virtual Error presentDisplay(Display display, int32_t* outPresentFence,
+                                 std::vector<Layer>* outLayers,
+                                 std::vector<int32_t>* outReleaseFences) = 0;
+
+    virtual Error setLayerCursorPosition(Display display, Layer layer, int32_t x, int32_t y) = 0;
+    virtual Error setLayerBuffer(Display display, Layer layer, buffer_handle_t buffer,
+                                 int32_t acquireFence) = 0;
+    virtual Error setLayerSurfaceDamage(Display display, Layer layer,
+                                        const std::vector<hwc_rect_t>& damage) = 0;
+    virtual Error setLayerBlendMode(Display display, Layer layer, int32_t mode) = 0;
+    virtual Error setLayerColor(Display display, Layer layer, IComposerClient::Color color) = 0;
+    virtual Error setLayerCompositionType(Display display, Layer layer, int32_t type) = 0;
+    virtual Error setLayerDataspace(Display display, Layer layer, int32_t dataspace) = 0;
+    virtual Error setLayerDisplayFrame(Display display, Layer layer, const hwc_rect_t& frame) = 0;
+    virtual Error setLayerPlaneAlpha(Display display, Layer layer, float alpha) = 0;
+    virtual Error setLayerSidebandStream(Display display, Layer layer, buffer_handle_t stream) = 0;
+    virtual Error setLayerSourceCrop(Display display, Layer layer, const hwc_frect_t& crop) = 0;
+    virtual Error setLayerTransform(Display display, Layer layer, int32_t transform) = 0;
+    virtual Error setLayerVisibleRegion(Display display, Layer layer,
+                                        const std::vector<hwc_rect_t>& visible) = 0;
+    virtual Error setLayerZOrder(Display display, Layer layer, uint32_t z) = 0;
+};
+
+}  // namespace hal
+}  // namespace V2_1
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.1/utils/hal/include/composer-hal/2.1/ComposerResources.h b/service/2.1/utils/hal/include/composer-hal/2.1/ComposerResources.h
new file mode 100644
index 0000000..18d184e
--- a/dev/null
+++ b/service/2.1/utils/hal/include/composer-hal/2.1/ComposerResources.h
@@ -0,0 +1,592 @@
+/*
+ * Copyright 2018 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
+
+#ifndef LOG_TAG
+#warning "ComposerResources.h included without LOG_TAG"
+#endif
+
+#include <memory>
+#include <mutex>
+#include <unordered_map>
+#include <vector>
+
+#include <android/hardware/graphics/mapper/2.0/IMapper.h>
+#include <android/hardware/graphics/mapper/3.0/IMapper.h>
+#include <log/log.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_1 {
+namespace hal {
+
+// wrapper for IMapper to import buffers and sideband streams
+class ComposerHandleImporter {
+   public:
+    bool init() {
+        mMapper3 = mapper::V3_0::IMapper::getService();
+        if (mMapper3) {
+            return true;
+        }
+        ALOGD_IF(!mMapper3, "failed to get mapper 3.0 service, falling back to mapper 2.0");
+
+        mMapper2 = mapper::V2_0::IMapper::getService();
+        ALOGE_IF(!mMapper2, "failed to get mapper 2.0 service");
+
+        return mMapper2 != nullptr;
+    }
+
+    Error importBuffer(const native_handle_t* rawHandle, const native_handle_t** outBufferHandle) {
+        if (!rawHandle || (!rawHandle->numFds && !rawHandle->numInts)) {
+            *outBufferHandle = nullptr;
+            return Error::NONE;
+        }
+
+        const native_handle_t* bufferHandle;
+        if (mMapper2) {
+            mapper::V2_0::Error error;
+            mMapper2->importBuffer(
+                rawHandle, [&](const auto& tmpError, const auto& tmpBufferHandle) {
+                    error = tmpError;
+                    bufferHandle = static_cast<const native_handle_t*>(tmpBufferHandle);
+                });
+            if (error != mapper::V2_0::Error::NONE) {
+                return Error::NO_RESOURCES;
+            }
+        }
+        if (mMapper3) {
+            mapper::V3_0::Error error;
+            mMapper3->importBuffer(
+                rawHandle, [&](const auto& tmpError, const auto& tmpBufferHandle) {
+                    error = tmpError;
+                    bufferHandle = static_cast<const native_handle_t*>(tmpBufferHandle);
+                });
+            if (error != mapper::V3_0::Error::NONE) {
+                return Error::NO_RESOURCES;
+            }
+        }
+
+        *outBufferHandle = bufferHandle;
+        return Error::NONE;
+    }
+
+    void freeBuffer(const native_handle_t* bufferHandle) {
+        if (bufferHandle) {
+            if (mMapper2) {
+                mMapper2->freeBuffer(
+                    static_cast<void*>(const_cast<native_handle_t*>(bufferHandle)));
+            } else if (mMapper3) {
+                mMapper3->freeBuffer(
+                    static_cast<void*>(const_cast<native_handle_t*>(bufferHandle)));
+            }
+        }
+    }
+
+    Error importStream(const native_handle_t* rawHandle, const native_handle_t** outStreamHandle) {
+        const native_handle_t* streamHandle = nullptr;
+        if (rawHandle) {
+            streamHandle = native_handle_clone(rawHandle);
+            if (!streamHandle) {
+                return Error::NO_RESOURCES;
+            }
+        }
+
+        *outStreamHandle = streamHandle;
+        return Error::NONE;
+    }
+
+    void freeStream(const native_handle_t* streamHandle) {
+        if (streamHandle) {
+            native_handle_close(streamHandle);
+            native_handle_delete(const_cast<native_handle_t*>(streamHandle));
+        }
+    }
+
+   private:
+    sp<mapper::V2_0::IMapper> mMapper2;
+    sp<mapper::V3_0::IMapper> mMapper3;
+};
+
+class ComposerHandleCache {
+   public:
+    enum class HandleType {
+        INVALID,
+        BUFFER,
+        STREAM,
+    };
+
+    ComposerHandleCache(ComposerHandleImporter& importer, HandleType type, uint32_t cacheSize)
+        : mImporter(importer), mHandleType(type), mHandles(cacheSize, nullptr) {}
+
+    // must be initialized later with initCache
+    ComposerHandleCache(ComposerHandleImporter& importer) : mImporter(importer) {}
+
+    ~ComposerHandleCache() {
+        switch (mHandleType) {
+            case HandleType::BUFFER:
+                for (auto handle : mHandles) {
+                    mImporter.freeBuffer(handle);
+                }
+                break;
+            case HandleType::STREAM:
+                for (auto handle : mHandles) {
+                    mImporter.freeStream(handle);
+                }
+                break;
+            default:
+                break;
+        }
+    }
+
+    ComposerHandleCache(const ComposerHandleCache&) = delete;
+    ComposerHandleCache& operator=(const ComposerHandleCache&) = delete;
+
+    bool initCache(HandleType type, uint32_t cacheSize) {
+        // already initialized
+        if (mHandleType != HandleType::INVALID) {
+            return false;
+        }
+
+        mHandleType = type;
+        mHandles.resize(cacheSize, nullptr);
+
+        return true;
+    }
+
+    Error lookupCache(uint32_t slot, const native_handle_t** outHandle) {
+        if (slot >= 0 && slot < mHandles.size()) {
+            *outHandle = mHandles[slot];
+            return Error::NONE;
+        } else {
+            return Error::BAD_PARAMETER;
+        }
+    }
+
+    Error updateCache(uint32_t slot, const native_handle_t* handle,
+                      const native_handle** outReplacedHandle) {
+        if (slot >= 0 && slot < mHandles.size()) {
+            auto& cachedHandle = mHandles[slot];
+            *outReplacedHandle = cachedHandle;
+            cachedHandle = handle;
+            return Error::NONE;
+        } else {
+            return Error::BAD_PARAMETER;
+        }
+    }
+
+    // when fromCache is true, look up in the cache; otherwise, update the cache
+    Error getHandle(uint32_t slot, bool fromCache, const native_handle_t* inHandle,
+                    const native_handle_t** outHandle, const native_handle** outReplacedHandle) {
+        if (fromCache) {
+            *outReplacedHandle = nullptr;
+            return lookupCache(slot, outHandle);
+        } else {
+            *outHandle = inHandle;
+            return updateCache(slot, inHandle, outReplacedHandle);
+        }
+    }
+
+   private:
+    ComposerHandleImporter& mImporter;
+    HandleType mHandleType = HandleType::INVALID;
+    std::vector<const native_handle_t*> mHandles;
+};
+
+// layer resource
+class ComposerLayerResource {
+   public:
+    ComposerLayerResource(ComposerHandleImporter& importer, uint32_t bufferCacheSize)
+        : mBufferCache(importer, ComposerHandleCache::HandleType::BUFFER, bufferCacheSize),
+          mSidebandStreamCache(importer, ComposerHandleCache::HandleType::STREAM, 1) {}
+
+    virtual ~ComposerLayerResource() = default;
+
+    Error getBuffer(uint32_t slot, bool fromCache, const native_handle_t* inHandle,
+                    const native_handle_t** outHandle, const native_handle** outReplacedHandle) {
+        return mBufferCache.getHandle(slot, fromCache, inHandle, outHandle, outReplacedHandle);
+    }
+
+    Error getSidebandStream(uint32_t slot, bool fromCache, const native_handle_t* inHandle,
+                            const native_handle_t** outHandle,
+                            const native_handle** outReplacedHandle) {
+        return mSidebandStreamCache.getHandle(slot, fromCache, inHandle, outHandle,
+                                              outReplacedHandle);
+    }
+
+   protected:
+    ComposerHandleCache mBufferCache;
+    ComposerHandleCache mSidebandStreamCache;
+};
+
+// display resource
+class ComposerDisplayResource {
+   public:
+    enum class DisplayType {
+        PHYSICAL,
+        VIRTUAL,
+    };
+
+    virtual ~ComposerDisplayResource() = default;
+
+    ComposerDisplayResource(DisplayType type, ComposerHandleImporter& importer,
+                            uint32_t outputBufferCacheSize)
+        : mType(type),
+          mClientTargetCache(importer),
+          mOutputBufferCache(importer, ComposerHandleCache::HandleType::BUFFER,
+                             outputBufferCacheSize),
+          mMustValidate(true) {}
+
+    bool initClientTargetCache(uint32_t cacheSize) {
+        return mClientTargetCache.initCache(ComposerHandleCache::HandleType::BUFFER, cacheSize);
+    }
+
+    bool isVirtual() const { return mType == DisplayType::VIRTUAL; }
+
+    Error getClientTarget(uint32_t slot, bool fromCache, const native_handle_t* inHandle,
+                          const native_handle_t** outHandle,
+                          const native_handle** outReplacedHandle) {
+        return mClientTargetCache.getHandle(slot, fromCache, inHandle, outHandle,
+                                            outReplacedHandle);
+    }
+
+    Error getOutputBuffer(uint32_t slot, bool fromCache, const native_handle_t* inHandle,
+                          const native_handle_t** outHandle,
+                          const native_handle** outReplacedHandle) {
+        return mOutputBufferCache.getHandle(slot, fromCache, inHandle, outHandle,
+                                            outReplacedHandle);
+    }
+
+    bool addLayer(Layer layer, std::unique_ptr<ComposerLayerResource> layerResource) {
+        auto result = mLayerResources.emplace(layer, std::move(layerResource));
+        return result.second;
+    }
+
+    bool removeLayer(Layer layer) { return mLayerResources.erase(layer) > 0; }
+
+    ComposerLayerResource* findLayerResource(Layer layer) {
+        auto layerIter = mLayerResources.find(layer);
+        if (layerIter == mLayerResources.end()) {
+            return nullptr;
+        }
+
+        return layerIter->second.get();
+    }
+
+    std::vector<Layer> getLayers() const {
+        std::vector<Layer> layers;
+        layers.reserve(mLayerResources.size());
+        for (const auto& layerKey : mLayerResources) {
+            layers.push_back(layerKey.first);
+        }
+        return layers;
+    }
+
+    void setMustValidateState(bool mustValidate) { mMustValidate = mustValidate; }
+
+    bool mustValidate() const { return mMustValidate; }
+
+   protected:
+    const DisplayType mType;
+    ComposerHandleCache mClientTargetCache;
+    ComposerHandleCache mOutputBufferCache;
+    bool mMustValidate;
+
+    std::unordered_map<Layer, std::unique_ptr<ComposerLayerResource>> mLayerResources;
+};
+
+class ComposerResources {
+   private:
+    template <bool isBuffer>
+    class ReplacedHandle;
+
+   public:
+    static std::unique_ptr<ComposerResources> create() {
+        auto resources = std::make_unique<ComposerResources>();
+        return resources->init() ? std::move(resources) : nullptr;
+    }
+
+    ComposerResources() = default;
+    virtual ~ComposerResources() = default;
+
+    bool init() { return mImporter.init(); }
+
+    using RemoveDisplay =
+        std::function<void(Display display, bool isVirtual, const std::vector<Layer>& layers)>;
+    void clear(RemoveDisplay removeDisplay) {
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+        for (const auto& displayKey : mDisplayResources) {
+            Display display = displayKey.first;
+            const ComposerDisplayResource& displayResource = *displayKey.second;
+            removeDisplay(display, displayResource.isVirtual(), displayResource.getLayers());
+        }
+        mDisplayResources.clear();
+    }
+
+    Error addPhysicalDisplay(Display display) {
+        auto displayResource =
+            createDisplayResource(ComposerDisplayResource::DisplayType::PHYSICAL, 0);
+
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+        auto result = mDisplayResources.emplace(display, std::move(displayResource));
+        return result.second ? Error::NONE : Error::BAD_DISPLAY;
+    }
+
+    Error addVirtualDisplay(Display display, uint32_t outputBufferCacheSize) {
+        auto displayResource = createDisplayResource(ComposerDisplayResource::DisplayType::VIRTUAL,
+                                                     outputBufferCacheSize);
+
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+        auto result = mDisplayResources.emplace(display, std::move(displayResource));
+        return result.second ? Error::NONE : Error::BAD_DISPLAY;
+    }
+
+    Error removeDisplay(Display display) {
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+        return mDisplayResources.erase(display) > 0 ? Error::NONE : Error::BAD_DISPLAY;
+    }
+
+    Error setDisplayClientTargetCacheSize(Display display, uint32_t clientTargetCacheSize) {
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+        ComposerDisplayResource* displayResource = findDisplayResourceLocked(display);
+        if (!displayResource) {
+            return Error::BAD_DISPLAY;
+        }
+
+        return displayResource->initClientTargetCache(clientTargetCacheSize) ? Error::NONE
+                                                                             : Error::BAD_PARAMETER;
+    }
+
+    Error addLayer(Display display, Layer layer, uint32_t bufferCacheSize) {
+        auto layerResource = createLayerResource(bufferCacheSize);
+
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+        ComposerDisplayResource* displayResource = findDisplayResourceLocked(display);
+        if (!displayResource) {
+            return Error::BAD_DISPLAY;
+        }
+
+        return displayResource->addLayer(layer, std::move(layerResource)) ? Error::NONE
+                                                                          : Error::BAD_LAYER;
+    }
+
+    Error removeLayer(Display display, Layer layer) {
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+        ComposerDisplayResource* displayResource = findDisplayResourceLocked(display);
+        if (!displayResource) {
+            return Error::BAD_DISPLAY;
+        }
+
+        return displayResource->removeLayer(layer) ? Error::NONE : Error::BAD_LAYER;
+    }
+
+    using ReplacedBufferHandle = ReplacedHandle<true>;
+    using ReplacedStreamHandle = ReplacedHandle<false>;
+
+    Error getDisplayClientTarget(Display display, uint32_t slot, bool fromCache,
+                                 const native_handle_t* rawHandle,
+                                 const native_handle_t** outBufferHandle,
+                                 ReplacedBufferHandle* outReplacedBuffer) {
+        return getHandle<Cache::CLIENT_TARGET>(display, 0, slot, fromCache, rawHandle,
+                                               outBufferHandle, outReplacedBuffer);
+    }
+
+    Error getDisplayOutputBuffer(Display display, uint32_t slot, bool fromCache,
+                                 const native_handle_t* rawHandle,
+                                 const native_handle_t** outBufferHandle,
+                                 ReplacedBufferHandle* outReplacedBuffer) {
+        return getHandle<Cache::OUTPUT_BUFFER>(display, 0, slot, fromCache, rawHandle,
+                                               outBufferHandle, outReplacedBuffer);
+    }
+
+    Error getLayerBuffer(Display display, Layer layer, uint32_t slot, bool fromCache,
+                         const native_handle_t* rawHandle, const native_handle_t** outBufferHandle,
+                         ReplacedBufferHandle* outReplacedBuffer) {
+        return getHandle<Cache::LAYER_BUFFER>(display, layer, slot, fromCache, rawHandle,
+                                              outBufferHandle, outReplacedBuffer);
+    }
+
+    Error getLayerSidebandStream(Display display, Layer layer, const native_handle_t* rawHandle,
+                                 const native_handle_t** outStreamHandle,
+                                 ReplacedStreamHandle* outReplacedStream) {
+        return getHandle<Cache::LAYER_SIDEBAND_STREAM>(display, layer, 0, false, rawHandle,
+                                                       outStreamHandle, outReplacedStream);
+    }
+
+    void setDisplayMustValidateState(Display display, bool mustValidate) {
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+        auto* displayResource = findDisplayResourceLocked(display);
+        if (displayResource) {
+            displayResource->setMustValidateState(mustValidate);
+        }
+    }
+
+    bool mustValidateDisplay(Display display) {
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+        auto* displayResource = findDisplayResourceLocked(display);
+        if (displayResource) {
+            return displayResource->mustValidate();
+        }
+        return false;
+    }
+
+   protected:
+    virtual std::unique_ptr<ComposerDisplayResource> createDisplayResource(
+        ComposerDisplayResource::DisplayType type, uint32_t outputBufferCacheSize) {
+        return std::make_unique<ComposerDisplayResource>(type, mImporter, outputBufferCacheSize);
+    }
+
+    virtual std::unique_ptr<ComposerLayerResource> createLayerResource(uint32_t bufferCacheSize) {
+        return std::make_unique<ComposerLayerResource>(mImporter, bufferCacheSize);
+    }
+
+    ComposerDisplayResource* findDisplayResourceLocked(Display display) {
+        auto iter = mDisplayResources.find(display);
+        if (iter == mDisplayResources.end()) {
+            return nullptr;
+        }
+        return iter->second.get();
+    }
+
+    ComposerHandleImporter mImporter;
+
+    std::mutex mDisplayResourcesMutex;
+    std::unordered_map<Display, std::unique_ptr<ComposerDisplayResource>> mDisplayResources;
+
+   private:
+    enum class Cache {
+        CLIENT_TARGET,
+        OUTPUT_BUFFER,
+        LAYER_BUFFER,
+        LAYER_SIDEBAND_STREAM,
+    };
+
+    // When a buffer in the cache is replaced by a new one, we must keep it
+    // alive until it has been replaced in ComposerHal.
+    template <bool isBuffer>
+    class ReplacedHandle {
+       public:
+        ReplacedHandle() = default;
+        ReplacedHandle(const ReplacedHandle&) = delete;
+        ReplacedHandle& operator=(const ReplacedHandle&) = delete;
+
+        ~ReplacedHandle() { reset(); }
+
+        void reset(ComposerHandleImporter* importer = nullptr,
+                   const native_handle_t* handle = nullptr) {
+            if (mHandle) {
+                if (isBuffer) {
+                    mImporter->freeBuffer(mHandle);
+                } else {
+                    mImporter->freeStream(mHandle);
+                }
+            }
+
+            mImporter = importer;
+            mHandle = handle;
+        }
+
+       private:
+        ComposerHandleImporter* mImporter = nullptr;
+        const native_handle_t* mHandle = nullptr;
+    };
+
+    template <Cache cache, bool isBuffer>
+    Error getHandle(Display display, Layer layer, uint32_t slot, bool fromCache,
+                    const native_handle_t* rawHandle, const native_handle_t** outHandle,
+                    ReplacedHandle<isBuffer>* outReplacedHandle) {
+        Error error;
+
+        // import the raw handle (or ignore raw handle when fromCache is true)
+        const native_handle_t* importedHandle = nullptr;
+        if (!fromCache) {
+            error = (isBuffer) ? mImporter.importBuffer(rawHandle, &importedHandle)
+                               : mImporter.importStream(rawHandle, &importedHandle);
+            if (error != Error::NONE) {
+                return error;
+            }
+        }
+
+        std::lock_guard<std::mutex> lock(mDisplayResourcesMutex);
+
+        // find display/layer resource
+        const bool needLayerResource =
+            (cache == Cache::LAYER_BUFFER || cache == Cache::LAYER_SIDEBAND_STREAM);
+        ComposerDisplayResource* displayResource = findDisplayResourceLocked(display);
+        ComposerLayerResource* layerResource = (displayResource && needLayerResource)
+                                                   ? displayResource->findLayerResource(layer)
+                                                   : nullptr;
+
+        // lookup or update cache
+        const native_handle_t* replacedHandle = nullptr;
+        if (displayResource && (!needLayerResource || layerResource)) {
+            switch (cache) {
+                case Cache::CLIENT_TARGET:
+                    error = displayResource->getClientTarget(slot, fromCache, importedHandle,
+                                                             outHandle, &replacedHandle);
+                    break;
+                case Cache::OUTPUT_BUFFER:
+                    error = displayResource->getOutputBuffer(slot, fromCache, importedHandle,
+                                                             outHandle, &replacedHandle);
+                    break;
+                case Cache::LAYER_BUFFER:
+                    error = layerResource->getBuffer(slot, fromCache, importedHandle, outHandle,
+                                                     &replacedHandle);
+                    break;
+                case Cache::LAYER_SIDEBAND_STREAM:
+                    error = layerResource->getSidebandStream(slot, fromCache, importedHandle,
+                                                             outHandle, &replacedHandle);
+                    break;
+                default:
+                    error = Error::BAD_PARAMETER;
+                    break;
+            }
+
+            if (error != Error::NONE) {
+                ALOGW("invalid cache %d slot %d", int(cache), int(slot));
+            }
+        } else if (!displayResource) {
+            error = Error::BAD_DISPLAY;
+        } else {
+            error = Error::BAD_LAYER;
+        }
+
+        // clean up on errors
+        if (error != Error::NONE) {
+            if (!fromCache) {
+                if (isBuffer) {
+                    mImporter.freeBuffer(importedHandle);
+                } else {
+                    mImporter.freeStream(importedHandle);
+                }
+            }
+            return error;
+        }
+
+        outReplacedHandle->reset(&mImporter, replacedHandle);
+
+        return Error::NONE;
+    }
+};
+
+}  // namespace hal
+}  // namespace V2_1
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.1/utils/passthrough/Android.bp b/service/2.1/utils/passthrough/Android.bp
new file mode 100644
index 0000000..4d3c976
--- a/dev/null
+++ b/service/2.1/utils/passthrough/Android.bp
@@ -0,0 +1,22 @@
+cc_library_headers {
+    name: "android.hardware.graphics.composer@2.1-passthrough",
+    defaults: ["hidl_defaults"],
+    vendor: true,
+    shared_libs: [
+        "libhardware",
+        "libhwc2on1adapter",
+        "libhwc2onfbadapter",
+    ],
+    export_shared_lib_headers: [
+        "libhardware",
+        "libhwc2on1adapter",
+        "libhwc2onfbadapter",
+    ],
+    header_libs: [
+        "android.hardware.graphics.composer@2.1-hal",
+    ],
+    export_header_lib_headers: [
+        "android.hardware.graphics.composer@2.1-hal",
+    ],
+    export_include_dirs: ["include"],
+}
diff --git a/service/2.1/utils/passthrough/include/composer-passthrough/2.1/HwcHal.h b/service/2.1/utils/passthrough/include/composer-passthrough/2.1/HwcHal.h
new file mode 100644
index 0000000..5826b12
--- a/dev/null
+++ b/service/2.1/utils/passthrough/include/composer-passthrough/2.1/HwcHal.h
@@ -0,0 +1,679 @@
+/*
+ * Copyright 2016 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
+
+#ifndef LOG_TAG
+#warning "HwcHal.h included without LOG_TAG"
+#endif
+
+#include <atomic>
+#include <cstring>  // for strerror
+#include <type_traits>
+#include <unordered_set>
+#include <vector>
+
+#include <android/hardware/graphics/composer/2.1/IComposer.h>
+#include <composer-hal/2.1/ComposerHal.h>
+#define HWC2_INCLUDE_STRINGIFICATION
+#define HWC2_USE_CPP11
+#include <hardware/hwcomposer2.h>
+#undef HWC2_INCLUDE_STRINGIFICATION
+#undef HWC2_USE_CPP11
+#include <log/log.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_1 {
+namespace passthrough {
+
+namespace detail {
+
+using android::hardware::graphics::common::V1_0::ColorMode;
+using android::hardware::graphics::common::V1_0::ColorTransform;
+using android::hardware::graphics::common::V1_0::Dataspace;
+using android::hardware::graphics::common::V1_0::Hdr;
+using android::hardware::graphics::common::V1_0::PixelFormat;
+using android::hardware::graphics::common::V1_0::Transform;
+
+// HwcHalImpl implements V2_*::hal::ComposerHal on top of hwcomposer2
+template <typename Hal>
+class HwcHalImpl : public Hal {
+   public:
+    virtual ~HwcHalImpl() {
+        if (mDevice) {
+            hwc2_close(mDevice);
+        }
+    }
+
+    bool initWithModule(const hw_module_t* module) {
+        hwc2_device_t* device;
+        int result = hwc2_open(module, &device);
+        if (result) {
+            ALOGE("failed to open hwcomposer2 device: %s", strerror(-result));
+            return false;
+        }
+
+        return initWithDevice(std::move(device), true);
+    }
+
+    bool initWithDevice(hwc2_device_t* device, bool requireReliablePresentFence) {
+        // we own the device from this point on
+        mDevice = device;
+
+        initCapabilities();
+        if (requireReliablePresentFence &&
+            hasCapability(HWC2_CAPABILITY_PRESENT_FENCE_IS_NOT_RELIABLE)) {
+            ALOGE("present fence must be reliable");
+            mDevice->common.close(&mDevice->common);
+            mDevice = nullptr;
+            return false;
+        }
+
+        if (!initDispatch()) {
+            mDevice->common.close(&mDevice->common);
+            mDevice = nullptr;
+            return false;
+        }
+
+        return true;
+    }
+
+    bool hasCapability(hwc2_capability_t capability) override {
+        return (mCapabilities.count(capability) > 0);
+    }
+
+    std::string dumpDebugInfo() override {
+        uint32_t len = 0;
+        mDispatch.dump(mDevice, &len, nullptr);
+
+        std::vector<char> buf(len + 1);
+        mDispatch.dump(mDevice, &len, buf.data());
+        buf.resize(len + 1);
+        buf[len] = '\0';
+
+        return buf.data();
+    }
+
+    void registerEventCallback(hal::ComposerHal::EventCallback* callback) override {
+        mEventCallback = callback;
+
+        mDispatch.registerCallback(mDevice, HWC2_CALLBACK_HOTPLUG, this,
+                                   reinterpret_cast<hwc2_function_pointer_t>(hotplugHook));
+        mDispatch.registerCallback(mDevice, HWC2_CALLBACK_REFRESH, this,
+                                   reinterpret_cast<hwc2_function_pointer_t>(refreshHook));
+        mDispatch.registerCallback(mDevice, HWC2_CALLBACK_VSYNC, this,
+                                   reinterpret_cast<hwc2_function_pointer_t>(vsyncHook));
+    }
+
+    void unregisterEventCallback() override {
+        // we assume the callback functions
+        //
+        //  - can be unregistered
+        //  - can be in-flight
+        //  - will never be called afterward
+        //
+        // which is likely incorrect
+        mDispatch.registerCallback(mDevice, HWC2_CALLBACK_HOTPLUG, this, nullptr);
+        mDispatch.registerCallback(mDevice, HWC2_CALLBACK_REFRESH, this, nullptr);
+        mDispatch.registerCallback(mDevice, HWC2_CALLBACK_VSYNC, this, nullptr);
+
+        mEventCallback = nullptr;
+    }
+
+    uint32_t getMaxVirtualDisplayCount() override {
+        return mDispatch.getMaxVirtualDisplayCount(mDevice);
+    }
+
+    Error createVirtualDisplay(uint32_t width, uint32_t height, PixelFormat* format,
+                               Display* outDisplay) override {
+        int32_t hwc_format = static_cast<int32_t>(*format);
+        int32_t err =
+            mDispatch.createVirtualDisplay(mDevice, width, height, &hwc_format, outDisplay);
+        *format = static_cast<PixelFormat>(hwc_format);
+
+        return static_cast<Error>(err);
+    }
+
+    Error destroyVirtualDisplay(Display display) override {
+        int32_t err = mDispatch.destroyVirtualDisplay(mDevice, display);
+        return static_cast<Error>(err);
+    }
+
+    Error createLayer(Display display, Layer* outLayer) override {
+        int32_t err = mDispatch.createLayer(mDevice, display, outLayer);
+        return static_cast<Error>(err);
+    }
+
+    Error destroyLayer(Display display, Layer layer) override {
+        int32_t err = mDispatch.destroyLayer(mDevice, display, layer);
+        onLayerDestroyed(display, layer);
+        return static_cast<Error>(err);
+    }
+
+    Error getActiveConfig(Display display, Config* outConfig) override {
+        int32_t err = mDispatch.getActiveConfig(mDevice, display, outConfig);
+        return static_cast<Error>(err);
+    }
+
+    Error getClientTargetSupport(Display display, uint32_t width, uint32_t height,
+                                 PixelFormat format, Dataspace dataspace) override {
+        int32_t err = mDispatch.getClientTargetSupport(mDevice, display, width, height,
+                                                       static_cast<int32_t>(format),
+                                                       static_cast<int32_t>(dataspace));
+        return static_cast<Error>(err);
+    }
+
+    Error getColorModes(Display display, hidl_vec<ColorMode>* outModes) override {
+        uint32_t count = 0;
+        int32_t err = mDispatch.getColorModes(mDevice, display, &count, nullptr);
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+
+        outModes->resize(count);
+        err = mDispatch.getColorModes(
+            mDevice, display, &count,
+            reinterpret_cast<std::underlying_type<ColorMode>::type*>(outModes->data()));
+        if (err != HWC2_ERROR_NONE) {
+            *outModes = hidl_vec<ColorMode>();
+            return static_cast<Error>(err);
+        }
+
+        return Error::NONE;
+    }
+
+    Error getDisplayAttribute(Display display, Config config, IComposerClient::Attribute attribute,
+                              int32_t* outValue) override {
+        int32_t err = mDispatch.getDisplayAttribute(mDevice, display, config,
+                                                    static_cast<int32_t>(attribute), outValue);
+        return static_cast<Error>(err);
+    }
+
+    Error getDisplayConfigs(Display display, hidl_vec<Config>* outConfigs) override {
+        uint32_t count = 0;
+        int32_t err = mDispatch.getDisplayConfigs(mDevice, display, &count, nullptr);
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+
+        outConfigs->resize(count);
+        err = mDispatch.getDisplayConfigs(mDevice, display, &count, outConfigs->data());
+        if (err != HWC2_ERROR_NONE) {
+            *outConfigs = hidl_vec<Config>();
+            return static_cast<Error>(err);
+        }
+
+        return Error::NONE;
+    }
+
+    Error getDisplayName(Display display, hidl_string* outName) override {
+        uint32_t count = 0;
+        int32_t err = mDispatch.getDisplayName(mDevice, display, &count, nullptr);
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+
+        std::vector<char> buf(count + 1);
+        err = mDispatch.getDisplayName(mDevice, display, &count, buf.data());
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+        buf.resize(count + 1);
+        buf[count] = '\0';
+
+        *outName = buf.data();
+
+        return Error::NONE;
+    }
+
+    Error getDisplayType(Display display, IComposerClient::DisplayType* outType) override {
+        int32_t hwc_type = HWC2_DISPLAY_TYPE_INVALID;
+        int32_t err = mDispatch.getDisplayType(mDevice, display, &hwc_type);
+        *outType = static_cast<IComposerClient::DisplayType>(hwc_type);
+
+        return static_cast<Error>(err);
+    }
+
+    Error getDozeSupport(Display display, bool* outSupport) override {
+        int32_t hwc_support = 0;
+        int32_t err = mDispatch.getDozeSupport(mDevice, display, &hwc_support);
+        *outSupport = hwc_support;
+
+        return static_cast<Error>(err);
+    }
+
+    Error getHdrCapabilities(Display display, hidl_vec<Hdr>* outTypes, float* outMaxLuminance,
+                             float* outMaxAverageLuminance, float* outMinLuminance) override {
+        uint32_t count = 0;
+        int32_t err =
+            mDispatch.getHdrCapabilities(mDevice, display, &count, nullptr, outMaxLuminance,
+                                         outMaxAverageLuminance, outMinLuminance);
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+
+        outTypes->resize(count);
+        err = mDispatch.getHdrCapabilities(
+            mDevice, display, &count,
+            reinterpret_cast<std::underlying_type<Hdr>::type*>(outTypes->data()), outMaxLuminance,
+            outMaxAverageLuminance, outMinLuminance);
+        if (err != HWC2_ERROR_NONE) {
+            *outTypes = hidl_vec<Hdr>();
+            return static_cast<Error>(err);
+        }
+
+        return Error::NONE;
+    }
+
+    Error setActiveConfig(Display display, Config config) override {
+        int32_t err = mDispatch.setActiveConfig(mDevice, display, config);
+        return static_cast<Error>(err);
+    }
+
+    Error setColorMode(Display display, ColorMode mode) override {
+        int32_t err = mDispatch.setColorMode(mDevice, display, static_cast<int32_t>(mode));
+        return static_cast<Error>(err);
+    }
+
+    Error setPowerMode(Display display, IComposerClient::PowerMode mode) override {
+        int32_t err = mDispatch.setPowerMode(mDevice, display, static_cast<int32_t>(mode));
+        return static_cast<Error>(err);
+    }
+
+    Error setVsyncEnabled(Display display, IComposerClient::Vsync enabled) override {
+        int32_t err = mDispatch.setVsyncEnabled(mDevice, display, static_cast<int32_t>(enabled));
+        return static_cast<Error>(err);
+    }
+
+    Error setColorTransform(Display display, const float* matrix, int32_t hint) override {
+        int32_t err = mDispatch.setColorTransform(mDevice, display, matrix, hint);
+        return static_cast<Error>(err);
+    }
+
+    Error setClientTarget(Display display, buffer_handle_t target, int32_t acquireFence,
+                          int32_t dataspace, const std::vector<hwc_rect_t>& damage) override {
+        hwc_region region = {damage.size(), damage.data()};
+        int32_t err =
+            mDispatch.setClientTarget(mDevice, display, target, acquireFence, dataspace, region);
+        return static_cast<Error>(err);
+    }
+
+    Error setOutputBuffer(Display display, buffer_handle_t buffer, int32_t releaseFence) override {
+        int32_t err = mDispatch.setOutputBuffer(mDevice, display, buffer, releaseFence);
+        // unlike in setClientTarget, releaseFence is owned by us
+        if (err == HWC2_ERROR_NONE && releaseFence >= 0) {
+            close(releaseFence);
+        }
+
+        return static_cast<Error>(err);
+    }
+
+    Error validateDisplay(Display display, std::vector<Layer>* outChangedLayers,
+                          std::vector<IComposerClient::Composition>* outCompositionTypes,
+                          uint32_t* outDisplayRequestMask, std::vector<Layer>* outRequestedLayers,
+                          std::vector<uint32_t>* outRequestMasks) override {
+        onBeforeValidateDisplay(display);
+        uint32_t typesCount = 0;
+        uint32_t reqsCount = 0;
+        int32_t err = mDispatch.validateDisplay(mDevice, display, &typesCount, &reqsCount);
+
+        if (err != HWC2_ERROR_NONE && err != HWC2_ERROR_HAS_CHANGES) {
+            return static_cast<Error>(err);
+        }
+
+        err = getChangedCompositionTypes(display, &typesCount, nullptr, nullptr);
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+
+        std::vector<Layer> changedLayers(typesCount);
+        std::vector<IComposerClient::Composition> compositionTypes(typesCount);
+        err = getChangedCompositionTypes(display, &typesCount, changedLayers.data(),
+                                         compositionTypes.data());
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+
+        int32_t displayReqs = 0;
+        err = mDispatch.getDisplayRequests(mDevice, display, &displayReqs, &reqsCount, nullptr,
+                                           nullptr);
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+
+        std::vector<Layer> requestedLayers(reqsCount);
+        std::vector<uint32_t> requestMasks(reqsCount);
+        err = mDispatch.getDisplayRequests(mDevice, display, &displayReqs, &reqsCount,
+                                           requestedLayers.data(),
+                                           reinterpret_cast<int32_t*>(requestMasks.data()));
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+
+        *outChangedLayers = std::move(changedLayers);
+        *outCompositionTypes = std::move(compositionTypes);
+        *outDisplayRequestMask = displayReqs;
+        *outRequestedLayers = std::move(requestedLayers);
+        *outRequestMasks = std::move(requestMasks);
+
+        return static_cast<Error>(err);
+    }
+
+    Error acceptDisplayChanges(Display display) override {
+        int32_t err = mDispatch.acceptDisplayChanges(mDevice, display);
+        return static_cast<Error>(err);
+    }
+
+    Error presentDisplay(Display display, int32_t* outPresentFence, std::vector<Layer>* outLayers,
+                         std::vector<int32_t>* outReleaseFences) override {
+        *outPresentFence = -1;
+        int32_t err = mDispatch.presentDisplay(mDevice, display, outPresentFence);
+        if (err != HWC2_ERROR_NONE) {
+            return static_cast<Error>(err);
+        }
+
+        uint32_t count = 0;
+        err = mDispatch.getReleaseFences(mDevice, display, &count, nullptr, nullptr);
+        if (err != HWC2_ERROR_NONE) {
+            ALOGW("failed to get release fences");
+            return Error::NONE;
+        }
+
+        outLayers->resize(count);
+        outReleaseFences->resize(count);
+        err = mDispatch.getReleaseFences(mDevice, display, &count, outLayers->data(),
+                                         outReleaseFences->data());
+        if (err != HWC2_ERROR_NONE) {
+            ALOGW("failed to get release fences");
+            outLayers->clear();
+            outReleaseFences->clear();
+            return Error::NONE;
+        }
+
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerCursorPosition(Display display, Layer layer, int32_t x, int32_t y) override {
+        int32_t err = mDispatch.setCursorPosition(mDevice, display, layer, x, y);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerBuffer(Display display, Layer layer, buffer_handle_t buffer,
+                         int32_t acquireFence) override {
+        int32_t err = mDispatch.setLayerBuffer(mDevice, display, layer, buffer, acquireFence);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerSurfaceDamage(Display display, Layer layer,
+                                const std::vector<hwc_rect_t>& damage) override {
+        hwc_region region = {damage.size(), damage.data()};
+        int32_t err = mDispatch.setLayerSurfaceDamage(mDevice, display, layer, region);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerBlendMode(Display display, Layer layer, int32_t mode) override {
+        int32_t err = mDispatch.setLayerBlendMode(mDevice, display, layer, mode);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerColor(Display display, Layer layer, IComposerClient::Color color) override {
+        hwc_color_t hwc_color{color.r, color.g, color.b, color.a};
+        int32_t err = mDispatch.setLayerColor(mDevice, display, layer, hwc_color);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerCompositionType(Display display, Layer layer, int32_t type) override {
+        int32_t err = mDispatch.setLayerCompositionType(mDevice, display, layer, type);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerDataspace(Display display, Layer layer, int32_t dataspace) override {
+        int32_t err = mDispatch.setLayerDataspace(mDevice, display, layer, dataspace);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerDisplayFrame(Display display, Layer layer, const hwc_rect_t& frame) override {
+        int32_t err = mDispatch.setLayerDisplayFrame(mDevice, display, layer, frame);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerPlaneAlpha(Display display, Layer layer, float alpha) override {
+        int32_t err = mDispatch.setLayerPlaneAlpha(mDevice, display, layer, alpha);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerSidebandStream(Display display, Layer layer, buffer_handle_t stream) override {
+        int32_t err = mDispatch.setLayerSidebandStream(mDevice, display, layer, stream);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerSourceCrop(Display display, Layer layer, const hwc_frect_t& crop) override {
+        int32_t err = mDispatch.setLayerSourceCrop(mDevice, display, layer, crop);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerTransform(Display display, Layer layer, int32_t transform) override {
+        int32_t err = mDispatch.setLayerTransform(mDevice, display, layer, transform);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerVisibleRegion(Display display, Layer layer,
+                                const std::vector<hwc_rect_t>& visible) override {
+        hwc_region_t region = {visible.size(), visible.data()};
+        int32_t err = mDispatch.setLayerVisibleRegion(mDevice, display, layer, region);
+        return static_cast<Error>(err);
+    }
+
+    Error setLayerZOrder(Display display, Layer layer, uint32_t z) override {
+        int32_t err = mDispatch.setLayerZOrder(mDevice, display, layer, z);
+        return static_cast<Error>(err);
+    }
+
+   protected:
+    virtual void initCapabilities() {
+        uint32_t count = 0;
+        mDevice->getCapabilities(mDevice, &count, nullptr);
+
+        std::vector<int32_t> caps(count);
+        mDevice->getCapabilities(mDevice, &count, caps.data());
+        caps.resize(count);
+
+        mCapabilities.reserve(count);
+        for (auto cap : caps) {
+            mCapabilities.insert(static_cast<hwc2_capability_t>(cap));
+        }
+    }
+
+    template <typename T>
+    bool initDispatch(hwc2_function_descriptor_t desc, T* outPfn) {
+        auto pfn = mDevice->getFunction(mDevice, desc);
+        if (pfn) {
+            *outPfn = reinterpret_cast<T>(pfn);
+            return true;
+        } else {
+            ALOGE("failed to get hwcomposer2 function %d", desc);
+            return false;
+        }
+    }
+
+    virtual bool initDispatch() {
+        if (!initDispatch(HWC2_FUNCTION_ACCEPT_DISPLAY_CHANGES, &mDispatch.acceptDisplayChanges) ||
+            !initDispatch(HWC2_FUNCTION_CREATE_LAYER, &mDispatch.createLayer) ||
+            !initDispatch(HWC2_FUNCTION_CREATE_VIRTUAL_DISPLAY, &mDispatch.createVirtualDisplay) ||
+            !initDispatch(HWC2_FUNCTION_DESTROY_LAYER, &mDispatch.destroyLayer) ||
+            !initDispatch(HWC2_FUNCTION_DESTROY_VIRTUAL_DISPLAY,
+                          &mDispatch.destroyVirtualDisplay) ||
+            !initDispatch(HWC2_FUNCTION_DUMP, &mDispatch.dump) ||
+            !initDispatch(HWC2_FUNCTION_GET_ACTIVE_CONFIG, &mDispatch.getActiveConfig) ||
+            !initDispatch(HWC2_FUNCTION_GET_CHANGED_COMPOSITION_TYPES,
+                          &mDispatch.getChangedCompositionTypes) ||
+            !initDispatch(HWC2_FUNCTION_GET_CLIENT_TARGET_SUPPORT,
+                          &mDispatch.getClientTargetSupport) ||
+            !initDispatch(HWC2_FUNCTION_GET_COLOR_MODES, &mDispatch.getColorModes) ||
+            !initDispatch(HWC2_FUNCTION_GET_DISPLAY_ATTRIBUTE, &mDispatch.getDisplayAttribute) ||
+            !initDispatch(HWC2_FUNCTION_GET_DISPLAY_CONFIGS, &mDispatch.getDisplayConfigs) ||
+            !initDispatch(HWC2_FUNCTION_GET_DISPLAY_NAME, &mDispatch.getDisplayName) ||
+            !initDispatch(HWC2_FUNCTION_GET_DISPLAY_REQUESTS, &mDispatch.getDisplayRequests) ||
+            !initDispatch(HWC2_FUNCTION_GET_DISPLAY_TYPE, &mDispatch.getDisplayType) ||
+            !initDispatch(HWC2_FUNCTION_GET_DOZE_SUPPORT, &mDispatch.getDozeSupport) ||
+            !initDispatch(HWC2_FUNCTION_GET_HDR_CAPABILITIES, &mDispatch.getHdrCapabilities) ||
+            !initDispatch(HWC2_FUNCTION_GET_MAX_VIRTUAL_DISPLAY_COUNT,
+                          &mDispatch.getMaxVirtualDisplayCount) ||
+            !initDispatch(HWC2_FUNCTION_GET_RELEASE_FENCES, &mDispatch.getReleaseFences) ||
+            !initDispatch(HWC2_FUNCTION_PRESENT_DISPLAY, &mDispatch.presentDisplay) ||
+            !initDispatch(HWC2_FUNCTION_REGISTER_CALLBACK, &mDispatch.registerCallback) ||
+            !initDispatch(HWC2_FUNCTION_SET_ACTIVE_CONFIG, &mDispatch.setActiveConfig) ||
+            !initDispatch(HWC2_FUNCTION_SET_CLIENT_TARGET, &mDispatch.setClientTarget) ||
+            !initDispatch(HWC2_FUNCTION_SET_COLOR_MODE, &mDispatch.setColorMode) ||
+            !initDispatch(HWC2_FUNCTION_SET_COLOR_TRANSFORM, &mDispatch.setColorTransform) ||
+            !initDispatch(HWC2_FUNCTION_SET_CURSOR_POSITION, &mDispatch.setCursorPosition) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_BLEND_MODE, &mDispatch.setLayerBlendMode) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_BUFFER, &mDispatch.setLayerBuffer) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_COLOR, &mDispatch.setLayerColor) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_COMPOSITION_TYPE,
+                          &mDispatch.setLayerCompositionType) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_DATASPACE, &mDispatch.setLayerDataspace) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_DISPLAY_FRAME, &mDispatch.setLayerDisplayFrame) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_PLANE_ALPHA, &mDispatch.setLayerPlaneAlpha)) {
+            return false;
+        }
+
+        if (hasCapability(HWC2_CAPABILITY_SIDEBAND_STREAM)) {
+            if (!initDispatch(HWC2_FUNCTION_SET_LAYER_SIDEBAND_STREAM,
+                              &mDispatch.setLayerSidebandStream)) {
+                return false;
+            }
+        }
+
+        if (!initDispatch(HWC2_FUNCTION_SET_LAYER_SOURCE_CROP, &mDispatch.setLayerSourceCrop) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_SURFACE_DAMAGE,
+                          &mDispatch.setLayerSurfaceDamage) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_TRANSFORM, &mDispatch.setLayerTransform) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_VISIBLE_REGION,
+                          &mDispatch.setLayerVisibleRegion) ||
+            !initDispatch(HWC2_FUNCTION_SET_LAYER_Z_ORDER, &mDispatch.setLayerZOrder) ||
+            !initDispatch(HWC2_FUNCTION_SET_OUTPUT_BUFFER, &mDispatch.setOutputBuffer) ||
+            !initDispatch(HWC2_FUNCTION_SET_POWER_MODE, &mDispatch.setPowerMode) ||
+            !initDispatch(HWC2_FUNCTION_SET_VSYNC_ENABLED, &mDispatch.setVsyncEnabled) ||
+            !initDispatch(HWC2_FUNCTION_VALIDATE_DISPLAY, &mDispatch.validateDisplay)) {
+            return false;
+        }
+
+        return true;
+    }
+
+    virtual int32_t getChangedCompositionTypes(Display display, uint32_t* outTypesCount,
+                                               Layer* outChangedLayers,
+                                               IComposerClient::Composition* outCompositionTypes) {
+        return getChangedCompositionTypesInternal(display, outTypesCount, outChangedLayers,
+                                                  outCompositionTypes);
+    }
+    virtual void onLayerDestroyed(Display /* display */, Layer /* layer */) {}
+    virtual void onBeforeValidateDisplay(Display /* display */) {}
+
+    static void hotplugHook(hwc2_callback_data_t callbackData, hwc2_display_t display,
+                            int32_t connected) {
+        auto hal = static_cast<HwcHalImpl*>(callbackData);
+        hal->mEventCallback->onHotplug(display,
+                                       static_cast<IComposerCallback::Connection>(connected));
+    }
+
+    static void refreshHook(hwc2_callback_data_t callbackData, hwc2_display_t display) {
+        auto hal = static_cast<HwcHalImpl*>(callbackData);
+        hal->mEventCallback->onRefresh(display);
+    }
+
+    static void vsyncHook(hwc2_callback_data_t callbackData, hwc2_display_t display,
+                          int64_t timestamp) {
+        auto hal = static_cast<HwcHalImpl*>(callbackData);
+        hal->mEventCallback->onVsync(display, timestamp);
+    }
+
+    int32_t getChangedCompositionTypesInternal(Display display, uint32_t* outTypesCount,
+                                               Layer* outChangedLayers,
+                                               IComposerClient::Composition* outCompositionTypes) {
+        return mDispatch.getChangedCompositionTypes(
+                mDevice, display, outTypesCount, outChangedLayers,
+                reinterpret_cast<std::underlying_type<IComposerClient::Composition>::type*>(
+                        outCompositionTypes));
+    }
+
+    hwc2_device_t* mDevice = nullptr;
+
+    std::unordered_set<hwc2_capability_t> mCapabilities;
+
+    struct {
+        HWC2_PFN_ACCEPT_DISPLAY_CHANGES acceptDisplayChanges;
+        HWC2_PFN_CREATE_LAYER createLayer;
+        HWC2_PFN_CREATE_VIRTUAL_DISPLAY createVirtualDisplay;
+        HWC2_PFN_DESTROY_LAYER destroyLayer;
+        HWC2_PFN_DESTROY_VIRTUAL_DISPLAY destroyVirtualDisplay;
+        HWC2_PFN_DUMP dump;
+        HWC2_PFN_GET_ACTIVE_CONFIG getActiveConfig;
+        HWC2_PFN_GET_CHANGED_COMPOSITION_TYPES getChangedCompositionTypes;
+        HWC2_PFN_GET_CLIENT_TARGET_SUPPORT getClientTargetSupport;
+        HWC2_PFN_GET_COLOR_MODES getColorModes;
+        HWC2_PFN_GET_DISPLAY_ATTRIBUTE getDisplayAttribute;
+        HWC2_PFN_GET_DISPLAY_CONFIGS getDisplayConfigs;
+        HWC2_PFN_GET_DISPLAY_NAME getDisplayName;
+        HWC2_PFN_GET_DISPLAY_REQUESTS getDisplayRequests;
+        HWC2_PFN_GET_DISPLAY_TYPE getDisplayType;
+        HWC2_PFN_GET_DOZE_SUPPORT getDozeSupport;
+        HWC2_PFN_GET_HDR_CAPABILITIES getHdrCapabilities;
+        HWC2_PFN_GET_MAX_VIRTUAL_DISPLAY_COUNT getMaxVirtualDisplayCount;
+        HWC2_PFN_GET_RELEASE_FENCES getReleaseFences;
+        HWC2_PFN_PRESENT_DISPLAY presentDisplay;
+        HWC2_PFN_REGISTER_CALLBACK registerCallback;
+        HWC2_PFN_SET_ACTIVE_CONFIG setActiveConfig;
+        HWC2_PFN_SET_CLIENT_TARGET setClientTarget;
+        HWC2_PFN_SET_COLOR_MODE setColorMode;
+        HWC2_PFN_SET_COLOR_TRANSFORM setColorTransform;
+        HWC2_PFN_SET_CURSOR_POSITION setCursorPosition;
+        HWC2_PFN_SET_LAYER_BLEND_MODE setLayerBlendMode;
+        HWC2_PFN_SET_LAYER_BUFFER setLayerBuffer;
+        HWC2_PFN_SET_LAYER_COLOR setLayerColor;
+        HWC2_PFN_SET_LAYER_COMPOSITION_TYPE setLayerCompositionType;
+        HWC2_PFN_SET_LAYER_DATASPACE setLayerDataspace;
+        HWC2_PFN_SET_LAYER_DISPLAY_FRAME setLayerDisplayFrame;
+        HWC2_PFN_SET_LAYER_PLANE_ALPHA setLayerPlaneAlpha;
+        HWC2_PFN_SET_LAYER_SIDEBAND_STREAM setLayerSidebandStream;
+        HWC2_PFN_SET_LAYER_SOURCE_CROP setLayerSourceCrop;
+        HWC2_PFN_SET_LAYER_SURFACE_DAMAGE setLayerSurfaceDamage;
+        HWC2_PFN_SET_LAYER_TRANSFORM setLayerTransform;
+        HWC2_PFN_SET_LAYER_VISIBLE_REGION setLayerVisibleRegion;
+        HWC2_PFN_SET_LAYER_Z_ORDER setLayerZOrder;
+        HWC2_PFN_SET_OUTPUT_BUFFER setOutputBuffer;
+        HWC2_PFN_SET_POWER_MODE setPowerMode;
+        HWC2_PFN_SET_VSYNC_ENABLED setVsyncEnabled;
+        HWC2_PFN_VALIDATE_DISPLAY validateDisplay;
+    } mDispatch = {};
+
+    hal::ComposerHal::EventCallback* mEventCallback = nullptr;
+};
+
+}  // namespace detail
+
+using HwcHal = detail::HwcHalImpl<hal::ComposerHal>;
+
+}  // namespace passthrough
+}  // namespace V2_1
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.1/utils/passthrough/include/composer-passthrough/2.1/HwcLoader.h b/service/2.1/utils/passthrough/include/composer-passthrough/2.1/HwcLoader.h
new file mode 100644
index 0000000..33c914d
--- a/dev/null
+++ b/service/2.1/utils/passthrough/include/composer-passthrough/2.1/HwcLoader.h
@@ -0,0 +1,152 @@
+/*
+ * Copyright 2016 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
+
+#ifndef LOG_TAG
+#warning "HwcLoader.h included without LOG_TAG"
+#endif
+
+#include <memory>
+
+#include <composer-hal/2.1/Composer.h>
+#include <composer-passthrough/2.1/HwcHal.h>
+#include <hardware/fb.h>
+#include <hardware/gralloc.h>
+#include <hardware/hardware.h>
+#include <hardware/hwcomposer.h>
+#include <hardware/hwcomposer2.h>
+#include <hwc2on1adapter/HWC2On1Adapter.h>
+#include <hwc2onfbadapter/HWC2OnFbAdapter.h>
+#include <log/log.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_1 {
+namespace passthrough {
+
+class HwcLoader {
+   public:
+    static IComposer* load() {
+        const hw_module_t* module = loadModule();
+        if (!module) {
+            return nullptr;
+        }
+
+        auto hal = createHalWithAdapter(module);
+        if (!hal) {
+            return nullptr;
+        }
+
+        return createComposer(std::move(hal));
+    }
+
+    // load hwcomposer2 module
+    static const hw_module_t* loadModule() {
+        const hw_module_t* module;
+        int error = hw_get_module(HWC_HARDWARE_MODULE_ID, &module);
+        if (error) {
+            ALOGI("falling back to gralloc module");
+            error = hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module);
+        }
+
+        if (error) {
+            ALOGE("failed to get hwcomposer or gralloc module");
+            return nullptr;
+        }
+
+        return module;
+    }
+
+    // create a ComposerHal instance
+    static std::unique_ptr<hal::ComposerHal> createHal(const hw_module_t* module) {
+        auto hal = std::make_unique<HwcHal>();
+        return hal->initWithModule(module) ? std::move(hal) : nullptr;
+    }
+
+    // create a ComposerHal instance, insert an adapter if necessary
+    static std::unique_ptr<hal::ComposerHal> createHalWithAdapter(const hw_module_t* module) {
+        bool adapted;
+        hwc2_device_t* device = openDeviceWithAdapter(module, &adapted);
+        if (!device) {
+            return nullptr;
+        }
+        auto hal = std::make_unique<HwcHal>();
+        return hal->initWithDevice(std::move(device), !adapted) ? std::move(hal) : nullptr;
+    }
+
+    // create an IComposer instance
+    static IComposer* createComposer(std::unique_ptr<hal::ComposerHal> hal) {
+        return hal::Composer::create(std::move(hal)).release();
+    }
+
+   protected:
+    // open hwcomposer2 device, install an adapter if necessary
+    static hwc2_device_t* openDeviceWithAdapter(const hw_module_t* module, bool* outAdapted) {
+        if (module->id && std::string(module->id) == GRALLOC_HARDWARE_MODULE_ID) {
+            *outAdapted = true;
+            return adaptGrallocModule(module);
+        }
+
+        hw_device_t* device;
+        int error = module->methods->open(module, HWC_HARDWARE_COMPOSER, &device);
+        if (error) {
+            ALOGE("failed to open hwcomposer device: %s", strerror(-error));
+            return nullptr;
+        }
+
+        int major = (device->version >> 24) & 0xf;
+        if (major != 2) {
+            *outAdapted = true;
+            return adaptHwc1Device(std::move(reinterpret_cast<hwc_composer_device_1*>(device)));
+        }
+
+        *outAdapted = false;
+        return reinterpret_cast<hwc2_device_t*>(device);
+    }
+
+   private:
+    static hwc2_device_t* adaptGrallocModule(const hw_module_t* module) {
+        framebuffer_device_t* device;
+        int error = framebuffer_open(module, &device);
+        if (error) {
+            ALOGE("failed to open framebuffer device: %s", strerror(-error));
+            return nullptr;
+        }
+
+        return new HWC2OnFbAdapter(device);
+    }
+
+    static hwc2_device_t* adaptHwc1Device(hwc_composer_device_1* device) {
+        int minor = (device->common.version >> 16) & 0xf;
+        if (minor < 1) {
+            ALOGE("hwcomposer 1.0 is not supported");
+            device->common.close(&device->common);
+            return nullptr;
+        }
+
+        return new HWC2On1Adapter(device);
+    }
+};
+
+}  // namespace passthrough
+}  // namespace V2_1
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.2/utils/passthrough/Android.bp b/service/2.2/utils/passthrough/Android.bp
new file mode 100644
index 0000000..318ce91
--- a/dev/null
+++ b/service/2.2/utils/passthrough/Android.bp
@@ -0,0 +1,14 @@
+cc_library_headers {
+    name: "android.hardware.graphics.composer@2.2-passthrough",
+    defaults: ["hidl_defaults"],
+    vendor: true,
+    header_libs: [
+        "android.hardware.graphics.composer@2.1-passthrough",
+        "android.hardware.graphics.composer@2.2-hal",
+    ],
+    export_header_lib_headers: [
+        "android.hardware.graphics.composer@2.1-passthrough",
+        "android.hardware.graphics.composer@2.2-hal",
+    ],
+    export_include_dirs: ["include"],
+}
diff --git a/service/2.2/utils/passthrough/include/composer-passthrough/2.2/HwcHal.h b/service/2.2/utils/passthrough/include/composer-passthrough/2.2/HwcHal.h
new file mode 100644
index 0000000..93da0a5
--- a/dev/null
+++ b/service/2.2/utils/passthrough/include/composer-passthrough/2.2/HwcHal.h
@@ -0,0 +1,301 @@
+/*
+ * Copyright 2018 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
+
+#ifndef LOG_TAG
+#warning "HwcHal.h included without LOG_TAG"
+#endif
+
+#include <type_traits>
+
+#include <composer-hal/2.2/ComposerHal.h>
+#include <composer-passthrough/2.1/HwcHal.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_2 {
+namespace passthrough {
+
+namespace detail {
+
+using common::V1_1::ColorMode;
+using common::V1_1::Dataspace;
+using common::V1_1::PixelFormat;
+using common::V1_1::RenderIntent;
+using V2_1::Display;
+using V2_1::Error;
+using V2_1::Layer;
+
+// HwcHalImpl implements V2_*::hal::ComposerHal on top of hwcomposer2
+template <typename Hal>
+class HwcHalImpl : public V2_1::passthrough::detail::HwcHalImpl<Hal> {
+   public:
+    // XXX when can we return Error::UNSUPPORTED?
+
+    Error getPerFrameMetadataKeys(
+        Display display, std::vector<IComposerClient::PerFrameMetadataKey>* outKeys) override {
+        if (!mDispatch.getPerFrameMetadataKeys) {
+            return Error::UNSUPPORTED;
+        }
+
+        uint32_t count = 0;
+        int32_t error = mDispatch.getPerFrameMetadataKeys(mDevice, display, &count, nullptr);
+        if (error != HWC2_ERROR_NONE) {
+            return static_cast<Error>(error);
+        }
+
+        std::vector<IComposerClient::PerFrameMetadataKey> keys(count);
+        error = mDispatch.getPerFrameMetadataKeys(
+            mDevice, display, &count,
+            reinterpret_cast<std::underlying_type<IComposerClient::PerFrameMetadataKey>::type*>(
+                keys.data()));
+        if (error != HWC2_ERROR_NONE) {
+            return static_cast<Error>(error);
+        }
+
+        keys.resize(count);
+        *outKeys = std::move(keys);
+        return Error::NONE;
+    }
+
+    Error setLayerPerFrameMetadata(
+        Display display, Layer layer,
+        const std::vector<IComposerClient::PerFrameMetadata>& metadata) override {
+        if (!mDispatch.setLayerPerFrameMetadata) {
+            return Error::UNSUPPORTED;
+        }
+
+        std::vector<int32_t> keys;
+        std::vector<float> values;
+        keys.reserve(metadata.size());
+        values.reserve(metadata.size());
+        for (const auto& m : metadata) {
+            keys.push_back(static_cast<int32_t>(m.key));
+            values.push_back(m.value);
+        }
+
+        int32_t error = mDispatch.setLayerPerFrameMetadata(mDevice, display, layer, metadata.size(),
+                                                           keys.data(), values.data());
+        return static_cast<Error>(error);
+    }
+
+    Error getReadbackBufferAttributes(Display display, PixelFormat* outFormat,
+                                      Dataspace* outDataspace) override {
+        if (!mDispatch.getReadbackBufferAttributes) {
+            return Error::UNSUPPORTED;
+        }
+
+        int32_t format = 0;
+        int32_t dataspace = 0;
+        int32_t error =
+            mDispatch.getReadbackBufferAttributes(mDevice, display, &format, &dataspace);
+        if (error == HWC2_ERROR_NONE) {
+            *outFormat = static_cast<PixelFormat>(format);
+            *outDataspace = static_cast<Dataspace>(dataspace);
+        }
+        return static_cast<Error>(error);
+    }
+
+    Error setReadbackBuffer(Display display, const native_handle_t* bufferHandle,
+                            base::unique_fd fenceFd) override {
+        if (!mDispatch.setReadbackBuffer) {
+            return Error::UNSUPPORTED;
+        }
+
+        int32_t error =
+            mDispatch.setReadbackBuffer(mDevice, display, bufferHandle, fenceFd.release());
+        return static_cast<Error>(error);
+    }
+
+    Error getReadbackBufferFence(Display display, base::unique_fd* outFenceFd) override {
+        if (!mDispatch.getReadbackBufferFence) {
+            return Error::UNSUPPORTED;
+        }
+
+        int32_t fenceFd = -1;
+        int32_t error = mDispatch.getReadbackBufferFence(mDevice, display, &fenceFd);
+        outFenceFd->reset(fenceFd);
+        return static_cast<Error>(error);
+    }
+
+    Error createVirtualDisplay_2_2(uint32_t width, uint32_t height, PixelFormat* format,
+                                   Display* outDisplay) override {
+        return createVirtualDisplay(
+            width, height, reinterpret_cast<common::V1_0::PixelFormat*>(format), outDisplay);
+    }
+
+    Error getClientTargetSupport_2_2(Display display, uint32_t width, uint32_t height,
+                                     PixelFormat format, Dataspace dataspace) override {
+        return getClientTargetSupport(display, width, height,
+                                      static_cast<common::V1_0::PixelFormat>(format),
+                                      static_cast<common::V1_0::Dataspace>(dataspace));
+    }
+
+    Error setPowerMode_2_2(Display display, IComposerClient::PowerMode mode) override {
+        if (mode == IComposerClient::PowerMode::ON_SUSPEND) {
+            return Error::UNSUPPORTED;
+        }
+        return setPowerMode(display, static_cast<V2_1::IComposerClient::PowerMode>(mode));
+    }
+
+    Error setLayerFloatColor(Display display, Layer layer,
+                             IComposerClient::FloatColor color) override {
+        if (!mDispatch.setLayerFloatColor) {
+            return Error::UNSUPPORTED;
+        }
+
+        int32_t error = mDispatch.setLayerFloatColor(
+            mDevice, display, layer, hwc_float_color{color.r, color.g, color.b, color.a});
+        return static_cast<Error>(error);
+    }
+
+    Error getColorModes_2_2(Display display, hidl_vec<ColorMode>* outModes) override {
+        return getColorModes(display,
+                             reinterpret_cast<hidl_vec<common::V1_0::ColorMode>*>(outModes));
+    }
+
+    Error getRenderIntents(Display display, ColorMode mode,
+                           std::vector<RenderIntent>* outIntents) override {
+        if (!mDispatch.getRenderIntents) {
+            *outIntents = std::vector<RenderIntent>({RenderIntent::COLORIMETRIC});
+            return Error::NONE;
+        }
+
+        uint32_t count = 0;
+        int32_t error =
+            mDispatch.getRenderIntents(mDevice, display, int32_t(mode), &count, nullptr);
+        if (error != HWC2_ERROR_NONE) {
+            return static_cast<Error>(error);
+        }
+
+        std::vector<RenderIntent> intents(count);
+        error = mDispatch.getRenderIntents(
+            mDevice, display, int32_t(mode), &count,
+            reinterpret_cast<std::underlying_type<RenderIntent>::type*>(intents.data()));
+        if (error != HWC2_ERROR_NONE) {
+            return static_cast<Error>(error);
+        }
+        intents.resize(count);
+
+        *outIntents = std::move(intents);
+        return Error::NONE;
+    }
+
+    Error setColorMode_2_2(Display display, ColorMode mode, RenderIntent intent) override {
+        if (!mDispatch.setColorModeWithRenderIntent) {
+            if (intent != RenderIntent::COLORIMETRIC) {
+                return Error::UNSUPPORTED;
+            }
+            return setColorMode(display, static_cast<common::V1_0::ColorMode>(mode));
+        }
+
+        int32_t err = mDispatch.setColorModeWithRenderIntent(
+            mDevice, display, static_cast<int32_t>(mode), static_cast<int32_t>(intent));
+        return static_cast<Error>(err);
+    }
+
+    std::array<float, 16> getDataspaceSaturationMatrix(Dataspace dataspace) override {
+        std::array<float, 16> matrix;
+
+        int32_t error = HWC2_ERROR_UNSUPPORTED;
+        if (mDispatch.getDataspaceSaturationMatrix) {
+            error = mDispatch.getDataspaceSaturationMatrix(mDevice, static_cast<int32_t>(dataspace),
+                                                           matrix.data());
+        }
+        if (error != HWC2_ERROR_NONE) {
+            return std::array<float, 16>{
+                1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
+                0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f,
+            };
+        }
+
+        return matrix;
+    }
+
+   protected:
+    template <typename T>
+    bool initOptionalDispatch(hwc2_function_descriptor_t desc, T* outPfn) {
+        auto pfn = mDevice->getFunction(mDevice, desc);
+        if (pfn) {
+            *outPfn = reinterpret_cast<T>(pfn);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    bool initDispatch() override {
+        if (!BaseType2_1::initDispatch()) {
+            return false;
+        }
+
+        initOptionalDispatch(HWC2_FUNCTION_SET_LAYER_FLOAT_COLOR, &mDispatch.setLayerFloatColor);
+
+        initOptionalDispatch(HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA,
+                             &mDispatch.setLayerPerFrameMetadata);
+        initOptionalDispatch(HWC2_FUNCTION_GET_PER_FRAME_METADATA_KEYS,
+                             &mDispatch.getPerFrameMetadataKeys);
+
+        initOptionalDispatch(HWC2_FUNCTION_SET_READBACK_BUFFER, &mDispatch.setReadbackBuffer);
+        initOptionalDispatch(HWC2_FUNCTION_GET_READBACK_BUFFER_ATTRIBUTES,
+                             &mDispatch.getReadbackBufferAttributes);
+        initOptionalDispatch(HWC2_FUNCTION_GET_READBACK_BUFFER_FENCE,
+                             &mDispatch.getReadbackBufferFence);
+
+        initOptionalDispatch(HWC2_FUNCTION_GET_RENDER_INTENTS, &mDispatch.getRenderIntents);
+        initOptionalDispatch(HWC2_FUNCTION_SET_COLOR_MODE_WITH_RENDER_INTENT,
+                             &mDispatch.setColorModeWithRenderIntent);
+        initOptionalDispatch(HWC2_FUNCTION_GET_DATASPACE_SATURATION_MATRIX,
+                             &mDispatch.getDataspaceSaturationMatrix);
+
+        return true;
+    }
+
+    struct {
+        HWC2_PFN_SET_LAYER_FLOAT_COLOR setLayerFloatColor;
+        HWC2_PFN_SET_LAYER_PER_FRAME_METADATA setLayerPerFrameMetadata;
+        HWC2_PFN_GET_PER_FRAME_METADATA_KEYS getPerFrameMetadataKeys;
+        HWC2_PFN_SET_READBACK_BUFFER setReadbackBuffer;
+        HWC2_PFN_GET_READBACK_BUFFER_ATTRIBUTES getReadbackBufferAttributes;
+        HWC2_PFN_GET_READBACK_BUFFER_FENCE getReadbackBufferFence;
+        HWC2_PFN_GET_RENDER_INTENTS getRenderIntents;
+        HWC2_PFN_SET_COLOR_MODE_WITH_RENDER_INTENT setColorModeWithRenderIntent;
+        HWC2_PFN_GET_DATASPACE_SATURATION_MATRIX getDataspaceSaturationMatrix;
+    } mDispatch = {};
+
+   private:
+    using BaseType2_1 = V2_1::passthrough::detail::HwcHalImpl<Hal>;
+    using BaseType2_1::getColorModes;
+    using BaseType2_1::mDevice;
+    using BaseType2_1::setColorMode;
+    using BaseType2_1::createVirtualDisplay;
+    using BaseType2_1::getClientTargetSupport;
+    using BaseType2_1::setPowerMode;
+};
+
+}  // namespace detail
+
+using HwcHal = detail::HwcHalImpl<hal::ComposerHal>;
+
+}  // namespace passthrough
+}  // namespace V2_2
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.2/utils/passthrough/include/composer-passthrough/2.2/HwcLoader.h b/service/2.2/utils/passthrough/include/composer-passthrough/2.2/HwcLoader.h
new file mode 100644
index 0000000..cb4a238
--- a/dev/null
+++ b/service/2.2/utils/passthrough/include/composer-passthrough/2.2/HwcLoader.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2018 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
+
+#ifndef LOG_TAG
+#warning "HwcLoader.h included without LOG_TAG"
+#endif
+
+#include <composer-hal/2.2/Composer.h>
+#include <composer-hal/2.2/ComposerHal.h>
+#include <composer-passthrough/2.1/HwcLoader.h>
+#include <composer-passthrough/2.2/HwcHal.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_2 {
+namespace passthrough {
+
+class HwcLoader : public V2_1::passthrough::HwcLoader {
+   public:
+    static IComposer* load() {
+        const hw_module_t* module = loadModule();
+        if (!module) {
+            return nullptr;
+        }
+
+        auto hal = createHalWithAdapter(module);
+        if (!hal) {
+            return nullptr;
+        }
+
+        return createComposer(std::move(hal)).release();
+    }
+
+    // create a ComposerHal instance
+    static std::unique_ptr<hal::ComposerHal> createHal(const hw_module_t* module) {
+        auto hal = std::make_unique<HwcHal>();
+        return hal->initWithModule(module) ? std::move(hal) : nullptr;
+    }
+
+    // create a ComposerHal instance, insert an adapter if necessary
+    static std::unique_ptr<hal::ComposerHal> createHalWithAdapter(const hw_module_t* module) {
+        bool adapted;
+        hwc2_device_t* device = openDeviceWithAdapter(module, &adapted);
+        if (!device) {
+            return nullptr;
+        }
+        auto hal = std::make_unique<HwcHal>();
+        return hal->initWithDevice(std::move(device), !adapted) ? std::move(hal) : nullptr;
+    }
+
+    // create an IComposer instance
+    static std::unique_ptr<IComposer> createComposer(std::unique_ptr<hal::ComposerHal> hal) {
+        return hal::Composer::create(std::move(hal));
+    }
+};
+
+}  // namespace passthrough
+}  // namespace V2_2
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.3/default/Android.bp b/service/2.3/default/Android.bp
new file mode 100644
index 0000000..07afd6c
--- a/dev/null
+++ b/service/2.3/default/Android.bp
@@ -0,0 +1,46 @@
+//
+// Copyright (C) 2018 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.
+//
+
+cc_binary {
+    name: "android.hardware.graphics.composer@2.3-service",
+    defaults: ["hidl_defaults"],
+    vendor: true,
+    relative_install_path: "hw",
+    srcs: ["service.cpp"],
+    init_rc: ["android.hardware.graphics.composer@2.3-service.rc"],
+    header_libs: [
+        "android.hardware.graphics.composer@2.3-passthrough",
+    ],
+    shared_libs: [
+        "android.hardware.graphics.composer@2.1",
+        "android.hardware.graphics.composer@2.2",
+        "android.hardware.graphics.composer@2.3",
+        "android.hardware.graphics.mapper@2.0",
+        "android.hardware.graphics.mapper@3.0",
+        "libbase",
+        "libbinder",
+        "libcutils",
+        "libfmq",
+        "libhardware",
+        "libhidlbase",
+        "libhidltransport",
+        "libhwc2on1adapter",
+        "libhwc2onfbadapter",
+        "liblog",
+        "libsync",
+        "libutils",
+    ],
+}
diff --git a/service/2.3/default/android.hardware.graphics.composer@2.3-service.rc b/service/2.3/default/android.hardware.graphics.composer@2.3-service.rc
new file mode 100644
index 0000000..81ce890
--- a/dev/null
+++ b/service/2.3/default/android.hardware.graphics.composer@2.3-service.rc
@@ -0,0 +1,7 @@
+service vendor.hwcomposer-2-3 /vendor/bin/hw/android.hardware.graphics.composer@2.3-service
+    class hal animation
+    user system
+    group graphics drmrpc
+    capabilities SYS_NICE
+    onrestart restart surfaceflinger
+    writepid /dev/cpuset/system-background/tasks
diff --git a/service/2.3/default/service.cpp b/service/2.3/default/service.cpp
new file mode 100644
index 0000000..347d8be
--- a/dev/null
+++ b/service/2.3/default/service.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2018 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 <sched.h>
+
+#include <android/hardware/graphics/composer/2.3/IComposer.h>
+#include <binder/ProcessState.h>
+#include <composer-passthrough/2.3/HwcLoader.h>
+#include <hidl/HidlTransportSupport.h>
+
+using android::hardware::graphics::composer::V2_3::IComposer;
+using android::hardware::graphics::composer::V2_3::passthrough::HwcLoader;
+
+int main() {
+    // the conventional HAL might start binder services
+    android::ProcessState::initWithDriver("/dev/vndbinder");
+    android::ProcessState::self()->setThreadPoolMaxThreadCount(4);
+    android::ProcessState::self()->startThreadPool();
+
+    // same as SF main thread
+    struct sched_param param = {0};
+    param.sched_priority = 2;
+    if (sched_setscheduler(0, SCHED_FIFO | SCHED_RESET_ON_FORK, &param) != 0) {
+        ALOGE("Couldn't set SCHED_FIFO: %d", errno);
+    }
+
+    android::hardware::configureRpcThreadpool(4, true /* will join */);
+
+    android::sp<IComposer> composer = HwcLoader::load();
+    if (composer == nullptr) {
+        return 1;
+    }
+    if (composer->registerAsService() != android::NO_ERROR) {
+        ALOGE("failed to register service");
+        return 1;
+    }
+
+    android::hardware::joinRpcThreadpool();
+
+    ALOGE("service is terminating");
+    return 1;
+}
diff --git a/service/2.3/utils/passthrough/Android.bp b/service/2.3/utils/passthrough/Android.bp
new file mode 100644
index 0000000..3ae6b16
--- a/dev/null
+++ b/service/2.3/utils/passthrough/Android.bp
@@ -0,0 +1,30 @@
+//
+// Copyright (C) 2018 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.
+//
+
+cc_library_headers {
+    name: "android.hardware.graphics.composer@2.3-passthrough",
+    defaults: ["hidl_defaults"],
+    vendor: true,
+    header_libs: [
+        "android.hardware.graphics.composer@2.2-passthrough",
+        "android.hardware.graphics.composer@2.3-hal",
+    ],
+    export_header_lib_headers: [
+        "android.hardware.graphics.composer@2.2-passthrough",
+        "android.hardware.graphics.composer@2.3-hal",
+    ],
+    export_include_dirs: ["include"],
+}
diff --git a/service/2.3/utils/passthrough/include/composer-passthrough/2.3/HwcHal.h b/service/2.3/utils/passthrough/include/composer-passthrough/2.3/HwcHal.h
new file mode 100644
index 0000000..d3b29bb
--- a/dev/null
+++ b/service/2.3/utils/passthrough/include/composer-passthrough/2.3/HwcHal.h
@@ -0,0 +1,441 @@
+/*
+ * Copyright 2018 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
+
+#ifndef LOG_TAG
+#warning "HwcHal.h included without LOG_TAG"
+#endif
+
+#include <type_traits>
+
+#include <composer-hal/2.3/ComposerHal.h>
+#include <composer-passthrough/2.2/HwcHal.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_3 {
+namespace passthrough {
+
+namespace detail {
+
+using common::V1_1::RenderIntent;
+using common::V1_2::ColorMode;
+using common::V1_2::Dataspace;
+using common::V1_2::Hdr;
+using common::V1_2::PixelFormat;
+using V2_1::Display;
+using V2_1::Error;
+
+namespace {
+
+bool isIdentityMatrix(const float* matrix) {
+    if (matrix[0] == 1.0 && matrix[1] == 0.0 && matrix[2] == 0.0 && matrix[3] == 0.0 &&
+        matrix[4] == 0.0 && matrix[5] == 1.0 && matrix[6] == 0.0 && matrix[7] == 0.0 &&
+        matrix[8] == 0.0 && matrix[9] == 0.0 && matrix[10] == 1.0 && matrix[11] == 0.0 &&
+        matrix[12] == 0.0 && matrix[13] == 0.0 && matrix[14] == 0.0 && matrix[15] == 1.0) {
+        return true;
+    }
+    return false;
+}
+
+}  // namespace
+
+// HwcHalImpl implements V2_*::hal::ComposerHal on top of hwcomposer2
+template <typename Hal>
+class HwcHalImpl : public V2_2::passthrough::detail::HwcHalImpl<Hal> {
+   public:
+    Error getPerFrameMetadataKeys_2_3(
+        Display display, std::vector<IComposerClient::PerFrameMetadataKey>* outKeys) override {
+        std::vector<V2_2::IComposerClient::PerFrameMetadataKey> castKeys;
+        Error error = getPerFrameMetadataKeys(display, &castKeys);
+        if (error != Error::NONE) {
+            return error;
+        }
+        outKeys->clear();
+        for (auto key : castKeys) {
+            outKeys->push_back(static_cast<IComposerClient::PerFrameMetadataKey>(key));
+        }
+        return Error::NONE;
+    }
+
+    Error setLayerPerFrameMetadata_2_3(
+        Display display, Layer layer,
+        const std::vector<IComposerClient::PerFrameMetadata>& metadata) override {
+        return setLayerPerFrameMetadata(
+            display, layer,
+            reinterpret_cast<const std::vector<V2_2::IComposerClient::PerFrameMetadata>&>(
+                metadata));
+    }
+
+    Error setColorMode_2_3(Display display, ColorMode mode, RenderIntent intent) override {
+        return setColorMode_2_2(display, static_cast<common::V1_1::ColorMode>(mode), intent);
+    }
+
+    Error getRenderIntents_2_3(Display display, ColorMode mode,
+                               std::vector<RenderIntent>* outIntents) override {
+        return getRenderIntents(display, static_cast<common::V1_1::ColorMode>(mode), outIntents);
+    }
+
+    Error getColorModes_2_3(Display display, hidl_vec<ColorMode>* outModes) override {
+        return getColorModes_2_2(display,
+                                 reinterpret_cast<hidl_vec<common::V1_1::ColorMode>*>(outModes));
+    }
+
+    Error getHdrCapabilities_2_3(Display display, hidl_vec<Hdr>* outTypes, float* outMaxLuminance,
+                                 float* outMaxAverageLuminance, float* outMinLuminance) override {
+        return getHdrCapabilities(display, reinterpret_cast<hidl_vec<common::V1_0::Hdr>*>(outTypes),
+                                  outMaxLuminance, outMaxAverageLuminance, outMinLuminance);
+    }
+
+    Error getClientTargetSupport_2_3(Display display, uint32_t width, uint32_t height,
+                                     PixelFormat format, Dataspace dataspace) override {
+        return getClientTargetSupport_2_2(display, width, height,
+                                          static_cast<common::V1_1::PixelFormat>(format),
+                                          static_cast<common::V1_1::Dataspace>(dataspace));
+    }
+
+    Error getReadbackBufferAttributes_2_3(Display display, PixelFormat* outFormat,
+                                          Dataspace* outDataspace) override {
+        return getReadbackBufferAttributes(
+                display, reinterpret_cast<common::V1_1::PixelFormat*>(outFormat),
+                reinterpret_cast<common::V1_1::Dataspace*>(outDataspace));
+    }
+
+    Error getDisplayIdentificationData(Display display, uint8_t* outPort,
+                                       std::vector<uint8_t>* outData) override {
+        if (!mDispatch.getDisplayIdentificationData) {
+            return Error::UNSUPPORTED;
+        }
+
+        uint32_t size = 0;
+        int32_t error =
+            mDispatch.getDisplayIdentificationData(mDevice, display, outPort, &size, nullptr);
+        if (error != HWC2_ERROR_NONE) {
+            return static_cast<Error>(error);
+        }
+
+        std::vector<uint8_t> data(size);
+        error =
+            mDispatch.getDisplayIdentificationData(mDevice, display, outPort, &size, data.data());
+        if (error != HWC2_ERROR_NONE) {
+            return static_cast<Error>(error);
+        }
+
+        data.resize(size);
+        *outData = std::move(data);
+        return Error::NONE;
+    }
+
+    Error setLayerColorTransform(Display display, Layer layer, const float* matrix) override {
+        if (!mDispatch.setLayerColorTransform) {
+            if (isIdentityMatrix(matrix)) {
+                // If an identity matrix is set, then we can remove the layer from client
+                // composition list.
+                mClientCompositionLayers[display].erase(layer);
+                return Error::UNSUPPORTED;
+            }
+            // if setLayerColorTransform is not implemented, per spec we want to make sure the
+            // layer marked as client composition, and thus we maintain a list, and mark all these
+            // layers as client composition later before validate the display.
+            mClientCompositionLayers[display].insert(layer);
+            return Error::UNSUPPORTED;
+        }
+        int32_t err = mDispatch.setLayerColorTransform(mDevice, display, layer, matrix);
+        return static_cast<Error>(err);
+    }
+
+    Error getDisplayedContentSamplingAttributes(
+        uint64_t display, PixelFormat& format, Dataspace& dataspace,
+        hidl_bitfield<IComposerClient::FormatColorComponent>& componentMask) override {
+        if (!mDispatch.getDisplayedContentSamplingAttributes) {
+            return Error::UNSUPPORTED;
+        }
+        int32_t formatRaw = 0;
+        int32_t dataspaceRaw = 0;
+        uint8_t componentMaskRaw = 0;
+        int32_t errorRaw = mDispatch.getDisplayedContentSamplingAttributes(
+            mDevice, display, &formatRaw, &dataspaceRaw, &componentMaskRaw);
+        auto error = static_cast<Error>(errorRaw);
+        if (error == Error::NONE) {
+            format = static_cast<PixelFormat>(formatRaw);
+            dataspace = static_cast<Dataspace>(dataspaceRaw);
+            componentMask =
+                static_cast<hidl_bitfield<IComposerClient::FormatColorComponent>>(componentMaskRaw);
+        }
+        return error;
+    };
+
+    Error setDisplayedContentSamplingEnabled(
+        uint64_t display, IComposerClient::DisplayedContentSampling enable,
+        hidl_bitfield<IComposerClient::FormatColorComponent> componentMask,
+        uint64_t maxFrames) override {
+        if (!mDispatch.setDisplayedContentSamplingEnabled) {
+            return Error::UNSUPPORTED;
+        }
+        return static_cast<Error>(mDispatch.setDisplayedContentSamplingEnabled(
+            mDevice, display, static_cast<int32_t>(enable), componentMask, maxFrames));
+    }
+
+    Error getDisplayedContentSample(uint64_t display, uint64_t maxFrames, uint64_t timestamp,
+                                    uint64_t& frameCount, hidl_vec<uint64_t>& sampleComponent0,
+                                    hidl_vec<uint64_t>& sampleComponent1,
+                                    hidl_vec<uint64_t>& sampleComponent2,
+                                    hidl_vec<uint64_t>& sampleComponent3) override {
+        if (!mDispatch.getDisplayedContentSample) {
+            return Error::UNSUPPORTED;
+        }
+
+        int32_t size[4] = {0};
+        auto errorRaw = mDispatch.getDisplayedContentSample(mDevice, display, maxFrames, timestamp,
+                                                            &frameCount, size, nullptr);
+        if (errorRaw != HWC2_ERROR_NONE) {
+            return static_cast<Error>(errorRaw);
+        }
+
+        sampleComponent0.resize(size[0]);
+        sampleComponent1.resize(size[1]);
+        sampleComponent2.resize(size[2]);
+        sampleComponent3.resize(size[3]);
+        uint64_t* samples[] = {sampleComponent0.data(), sampleComponent1.data(),
+                               sampleComponent2.data(), sampleComponent3.data()};
+        errorRaw = mDispatch.getDisplayedContentSample(mDevice, display, maxFrames, timestamp,
+                                                       &frameCount, size, samples);
+        return static_cast<Error>(errorRaw);
+    }
+
+    Error getDisplayCapabilities(
+            Display display,
+            std::vector<IComposerClient::DisplayCapability>* outCapabilities) override {
+        uint32_t count = 0;
+        int32_t error = mDispatch.getDisplayCapabilities(mDevice, display, &count, nullptr);
+        if (error != HWC2_ERROR_NONE) {
+            return static_cast<Error>(error);
+        }
+        outCapabilities->resize(count);
+        error = mDispatch.getDisplayCapabilities(
+            mDevice, display, &count,
+            reinterpret_cast<std::underlying_type<IComposerClient::DisplayCapability>::type*>(
+                outCapabilities->data()));
+        if (error != HWC2_ERROR_NONE) {
+            *outCapabilities = std::vector<IComposerClient::DisplayCapability>();
+            return static_cast<Error>(error);
+        }
+        return Error::NONE;
+    }
+
+    Error setLayerPerFrameMetadataBlobs(
+        Display display, Layer layer,
+        std::vector<IComposerClient::PerFrameMetadataBlob>& metadata) override {
+        if (!mDispatch.setLayerPerFrameMetadataBlobs) {
+            return Error::UNSUPPORTED;
+        }
+
+        std::vector<IComposerClient::PerFrameMetadataKey> keys;
+        std::vector<uint32_t> sizes;
+        std::vector<uint8_t> blobs;
+
+        for (auto metadataBlob : metadata) {
+            keys.push_back(metadataBlob.key);
+            sizes.push_back(metadataBlob.blob.size());
+
+            int writeIndex = blobs.size();
+            blobs.resize(blobs.size() + metadataBlob.blob.size());
+            memcpy(blobs.data() + writeIndex, metadataBlob.blob.data(), metadataBlob.blob.size());
+        }
+
+        int32_t err = mDispatch.setLayerPerFrameMetadataBlobs(
+            mDevice, display, layer, static_cast<uint32_t>(metadata.size()),
+            reinterpret_cast<int32_t*>(keys.data()), reinterpret_cast<uint32_t*>(sizes.data()),
+            blobs.data());
+        return static_cast<Error>(err);
+    }
+
+    Error getDisplayBrightnessSupport(Display display, bool* outSupport) {
+        if (!mDispatch.getDisplayBrightnessSupport) {
+            // Preemptively set to false.
+            *outSupport = false;
+            // Try to query from getDisplayCapabilities.
+            std::vector<IComposerClient::DisplayCapability> capabilities;
+            Error error = getDisplayCapabilities(display, &capabilities);
+            if (error != Error::NONE) {
+                // This function is not registered, always return UNSUPPORTED.
+                return Error::UNSUPPORTED;
+            }
+            *outSupport =
+                    std::find(capabilities.begin(), capabilities.end(),
+                              IComposerClient::DisplayCapability::BRIGHTNESS) != capabilities.end();
+            // This function is not registered, always return UNSUPPORTED.
+            return Error::UNSUPPORTED;
+        }
+        bool support = false;
+        int32_t error = mDispatch.getDisplayBrightnessSupport(mDevice, display, &support);
+        *outSupport = support;
+        return static_cast<Error>(error);
+    }
+
+    Error setDisplayBrightness(Display display, float brightness) {
+        if (std::isnan(brightness) || brightness > 1.0f ||
+            (brightness < 0.0f && brightness != -1.0f)) {
+            return Error::BAD_PARAMETER;
+        }
+        if (!mDispatch.setDisplayBrightness) {
+            return Error::UNSUPPORTED;
+        }
+        int32_t error = mDispatch.setDisplayBrightness(mDevice, display, brightness);
+        return static_cast<Error>(error);
+    }
+
+  protected:
+    bool initDispatch() override {
+        if (!BaseType2_2::initDispatch()) {
+            return false;
+        }
+
+        this->initOptionalDispatch(HWC2_FUNCTION_GET_DISPLAY_IDENTIFICATION_DATA,
+                                   &mDispatch.getDisplayIdentificationData);
+        this->initOptionalDispatch(HWC2_FUNCTION_SET_LAYER_COLOR_TRANSFORM,
+                                   &mDispatch.setLayerColorTransform);
+        this->initOptionalDispatch(HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLING_ATTRIBUTES,
+                                   &mDispatch.getDisplayedContentSamplingAttributes);
+        this->initOptionalDispatch(HWC2_FUNCTION_SET_DISPLAYED_CONTENT_SAMPLING_ENABLED,
+                                   &mDispatch.setDisplayedContentSamplingEnabled);
+        this->initOptionalDispatch(HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLE,
+                                   &mDispatch.getDisplayedContentSample);
+        this->initOptionalDispatch(HWC2_FUNCTION_GET_DISPLAY_CAPABILITIES,
+                                   &mDispatch.getDisplayCapabilities);
+        this->initOptionalDispatch(HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA_BLOBS,
+                                   &mDispatch.setLayerPerFrameMetadataBlobs);
+        this->initOptionalDispatch(HWC2_FUNCTION_GET_DISPLAY_BRIGHTNESS_SUPPORT,
+                                   &mDispatch.getDisplayBrightnessSupport);
+        this->initOptionalDispatch(HWC2_FUNCTION_SET_DISPLAY_BRIGHTNESS,
+                                   &mDispatch.setDisplayBrightness);
+        return true;
+    }
+
+    int32_t getChangedCompositionTypes(Display display, uint32_t* outTypesCount,
+                                       Layer* outChangedLayers,
+                                       IComposerClient::Composition* outCompositionTypes) override {
+        if (outChangedLayers == nullptr && outCompositionTypes == nullptr) {
+            uint32_t typesCount = 0;
+            int32_t error = BaseType2_1::getChangedCompositionTypesInternal(display, &typesCount,
+                                                                            nullptr, nullptr);
+            if (error != HWC2_ERROR_NONE) {
+                return error;
+            }
+            mChangedLayersCache[display].resize(typesCount);
+            mCompositionTypesCache[display].resize(typesCount);
+            error = BaseType2_1::getChangedCompositionTypesInternal(
+                    display, &typesCount, mChangedLayersCache[display].data(),
+                    mCompositionTypesCache[display].data());
+            if (error != HWC2_ERROR_NONE) {
+                return error;
+            }
+            for (Layer layer : mClientCompositionLayers[display]) {
+                bool exist = false;
+                for (uint32_t i = 0; i < typesCount; ++i) {
+                    if (mChangedLayersCache[display][i] == layer) {
+                        exist = true;
+                        break;
+                    }
+                }
+                if (!exist) {
+                    mChangedLayersCache[display].push_back(layer);
+                    mCompositionTypesCache[display].push_back(IComposerClient::Composition::CLIENT);
+                }
+            }
+            *outTypesCount = mChangedLayersCache[display].size();
+            return error;
+        }
+        for (uint32_t i = 0; i < *outTypesCount; ++i) {
+            if (outChangedLayers != nullptr) {
+                outChangedLayers[i] = mChangedLayersCache[display][i];
+            }
+            if (outCompositionTypes != nullptr) {
+                outCompositionTypes[i] = mCompositionTypesCache[display][i];
+            }
+        }
+        return HWC2_ERROR_NONE;
+    }
+
+    void onLayerDestroyed(Display display, Layer layer) override {
+        if (mClientCompositionLayers.find(display) == mClientCompositionLayers.end()) {
+            return;
+        }
+        mClientCompositionLayers[display].erase(layer);
+    }
+
+    void onBeforeValidateDisplay(Display display) override {
+        if (mClientCompositionLayers.find(display) == mClientCompositionLayers.end()) {
+            return;
+        }
+
+        // clear the cache proactively so that we don't hold too much memory over time.
+        mChangedLayersCache[display].clear();
+        mCompositionTypesCache[display].clear();
+
+        // SET_LAYER_COLOR_TRANSFORM is optional, and thus if it's not implemented, we need to
+        // follow the spec to make sure those layers marked as client composition before validate
+        // the display.
+        if (!mDispatch.setLayerColorTransform) {
+            for (Layer layer : mClientCompositionLayers[display]) {
+                BaseType2_1::setLayerCompositionType(
+                        display, layer, static_cast<int32_t>(IComposerClient::Composition::CLIENT));
+            }
+        }
+    }
+
+  private:
+    struct {
+        HWC2_PFN_GET_DISPLAY_IDENTIFICATION_DATA getDisplayIdentificationData;
+        HWC2_PFN_SET_LAYER_COLOR_TRANSFORM setLayerColorTransform;
+        HWC2_PFN_GET_DISPLAYED_CONTENT_SAMPLING_ATTRIBUTES getDisplayedContentSamplingAttributes;
+        HWC2_PFN_SET_DISPLAYED_CONTENT_SAMPLING_ENABLED setDisplayedContentSamplingEnabled;
+        HWC2_PFN_GET_DISPLAYED_CONTENT_SAMPLE getDisplayedContentSample;
+        HWC2_PFN_GET_DISPLAY_CAPABILITIES getDisplayCapabilities;
+        HWC2_PFN_SET_LAYER_PER_FRAME_METADATA_BLOBS setLayerPerFrameMetadataBlobs;
+        HWC2_PFN_GET_DISPLAY_BRIGHTNESS_SUPPORT getDisplayBrightnessSupport;
+        HWC2_PFN_SET_DISPLAY_BRIGHTNESS setDisplayBrightness;
+    } mDispatch = {};
+
+    using BaseType2_2 = V2_2::passthrough::detail::HwcHalImpl<Hal>;
+    using BaseType2_1 = V2_1::passthrough::detail::HwcHalImpl<Hal>;
+    using BaseType2_1::getHdrCapabilities;
+    using BaseType2_1::mDevice;
+    using BaseType2_2::getClientTargetSupport_2_2;
+    using BaseType2_2::getColorModes_2_2;
+    using BaseType2_2::getPerFrameMetadataKeys;
+    using BaseType2_2::getReadbackBufferAttributes;
+    using BaseType2_2::getRenderIntents;
+    using BaseType2_2::setColorMode_2_2;
+    using BaseType2_2::setLayerPerFrameMetadata;
+    std::map<Display, std::set<Layer>> mClientCompositionLayers;
+    std::map<Display, std::vector<Layer>> mChangedLayersCache;
+    std::map<Display, std::vector<IComposerClient::Composition>> mCompositionTypesCache;
+};
+
+}  // namespace detail
+
+using HwcHal = detail::HwcHalImpl<hal::ComposerHal>;
+
+}  // namespace passthrough
+}  // namespace V2_3
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android
diff --git a/service/2.3/utils/passthrough/include/composer-passthrough/2.3/HwcLoader.h b/service/2.3/utils/passthrough/include/composer-passthrough/2.3/HwcLoader.h
new file mode 100644
index 0000000..afef475
--- a/dev/null
+++ b/service/2.3/utils/passthrough/include/composer-passthrough/2.3/HwcLoader.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2018 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
+
+#ifndef LOG_TAG
+#warning "HwcLoader.h included without LOG_TAG"
+#endif
+
+#include <composer-hal/2.3/Composer.h>
+#include <composer-hal/2.3/ComposerHal.h>
+#include <composer-passthrough/2.2/HwcLoader.h>
+#include <composer-passthrough/2.3/HwcHal.h>
+
+namespace android {
+namespace hardware {
+namespace graphics {
+namespace composer {
+namespace V2_3 {
+namespace passthrough {
+
+class HwcLoader : public V2_2::passthrough::HwcLoader {
+   public:
+    static IComposer* load() {
+        const hw_module_t* module = loadModule();
+        if (!module) {
+            return nullptr;
+        }
+
+        auto hal = createHalWithAdapter(module);
+        if (!hal) {
+            return nullptr;
+        }
+
+        return createComposer(std::move(hal)).release();
+    }
+
+    // create a ComposerHal instance
+    static std::unique_ptr<hal::ComposerHal> createHal(const hw_module_t* module) {
+        auto hal = std::make_unique<HwcHal>();
+        return hal->initWithModule(module) ? std::move(hal) : nullptr;
+    }
+
+    // create a ComposerHal instance, insert an adapter if necessary
+    static std::unique_ptr<hal::ComposerHal> createHalWithAdapter(const hw_module_t* module) {
+        bool adapted;
+        hwc2_device_t* device = openDeviceWithAdapter(module, &adapted);
+        if (!device) {
+            return nullptr;
+        }
+        auto hal = std::make_unique<HwcHal>();
+        return hal->initWithDevice(std::move(device), !adapted) ? std::move(hal) : nullptr;
+    }
+
+    // create an IComposer instance
+    static std::unique_ptr<IComposer> createComposer(std::unique_ptr<hal::ComposerHal> hal) {
+        return hal::Composer::create(std::move(hal));
+    }
+};
+
+}  // namespace passthrough
+}  // namespace V2_3
+}  // namespace composer
+}  // namespace graphics
+}  // namespace hardware
+}  // namespace android