services/surfaceflinger/DisplayHardware/HidlComposerHal.cpp

/*
 * 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.
 */

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

#undef LOG_TAG
#define LOG_TAG "HwcComposer"
#define ATRACE_TAG ATRACE_TAG_GRAPHICS

#include "HidlComposerHal.h"

#include <SurfaceFlingerProperties.h>
#include <android/binder_manager.h>
#include <composer-command-buffer/2.2/ComposerCommandBuffer.h>
#include <hidl/HidlTransportSupport.h>
#include <hidl/HidlTransportUtils.h>
#include <log/log.h>
#include <utils/Trace.h>

#include "HWC2.h"
#include "Hal.h"

#include <algorithm>
#include <cinttypes>

using aidl::android::hardware::graphics::common::HdrConversionCapability;
using aidl::android::hardware::graphics::common::HdrConversionStrategy;
using aidl::android::hardware::graphics::composer3::Capability;
using aidl::android::hardware::graphics::composer3::ClientTargetPropertyWithBrightness;
using aidl::android::hardware::graphics::composer3::DimmingStage;
using aidl::android::hardware::graphics::composer3::DisplayCapability;
using aidl::android::hardware::graphics::composer3::OverlayProperties;

namespace android {

using hardware::hidl_handle;
using hardware::hidl_vec;
using hardware::Return;

namespace Hwc2 {
namespace {

using android::hardware::Return;
using android::hardware::Void;
using android::HWC2::ComposerCallback;

class ComposerCallbackBridge : public IComposerCallback {
public:
    ComposerCallbackBridge(ComposerCallback& callback, bool vsyncSwitchingSupported)
          : mCallback(callback), mVsyncSwitchingSupported(vsyncSwitchingSupported) {}

    Return<void> onHotplug(Display display, Connection connection) override {
        mCallback.onComposerHalHotplug(display, connection);
        return Void();
    }

    Return<void> onRefresh(Display display) override {
        mCallback.onComposerHalRefresh(display);
        return Void();
    }

    Return<void> onVsync(Display display, int64_t timestamp) override {
        if (!mVsyncSwitchingSupported) {
            mCallback.onComposerHalVsync(display, timestamp, std::nullopt);
        } else {
            ALOGW("Unexpected onVsync callback on composer >= 2.4, ignoring.");
        }
        return Void();
    }

    Return<void> onVsync_2_4(Display display, int64_t timestamp,
                             VsyncPeriodNanos vsyncPeriodNanos) override {
        if (mVsyncSwitchingSupported) {
            mCallback.onComposerHalVsync(display, timestamp, vsyncPeriodNanos);
        } else {
            ALOGW("Unexpected onVsync_2_4 callback on composer <= 2.3, ignoring.");
        }
        return Void();
    }

    Return<void> onVsyncPeriodTimingChanged(Display display,
                                            const VsyncPeriodChangeTimeline& timeline) override {
        mCallback.onComposerHalVsyncPeriodTimingChanged(display, timeline);
        return Void();
    }

    Return<void> onSeamlessPossible(Display display) override {
        mCallback.onComposerHalSeamlessPossible(display);
        return Void();
    }

private:
    ComposerCallback& mCallback;
    const bool mVsyncSwitchingSupported;
};

} // namespace

HidlComposer::~HidlComposer() = default;

namespace {

class BufferHandle {
public:
    explicit BufferHandle(const native_handle_t* buffer) {
        // nullptr is not a valid handle to HIDL
        mHandle = (buffer) ? buffer : native_handle_init(mStorage, 0, 0);
    }

    operator const hidl_handle&() const // NOLINT(google-explicit-constructor)
    {
        return mHandle;
    }

private:
    NATIVE_HANDLE_DECLARE_STORAGE(mStorage, 0, 0);
    hidl_handle mHandle;
};

class FenceHandle {
public:
    FenceHandle(int fd, bool owned) : mOwned(owned) {
        native_handle_t* handle;
        if (fd >= 0) {
            handle = native_handle_init(mStorage, 1, 0);
            handle->data[0] = fd;
        } else {
            // nullptr is not a valid handle to HIDL
            handle = native_handle_init(mStorage, 0, 0);
        }
        mHandle = handle;
    }

    ~FenceHandle() {
        if (mOwned) {
            native_handle_close(mHandle);
        }
    }

    operator const hidl_handle&() const // NOLINT(google-explicit-constructor)
    {
        return mHandle;
    }

private:
    bool mOwned;
    NATIVE_HANDLE_DECLARE_STORAGE(mStorage, 1, 0);
    hidl_handle mHandle;
};

// assume NO_RESOURCES when Status::isOk returns false
constexpr Error kDefaultError = Error::NO_RESOURCES;
constexpr V2_4::Error kDefaultError_2_4 = static_cast<V2_4::Error>(kDefaultError);

template <typename T, typename U>
T unwrapRet(Return<T>& ret, const U& default_val) {
    return (ret.isOk()) ? static_cast<T>(ret) : static_cast<T>(default_val);
}

Error unwrapRet(Return<Error>& ret) {
    return unwrapRet(ret, kDefaultError);
}

template <typename To, typename From>
To translate(From x) {
    return static_cast<To>(x);
}

template <typename To, typename From>
std::vector<To> translate(const hidl_vec<From>& in) {
    std::vector<To> out;
    out.reserve(in.size());
    std::transform(in.begin(), in.end(), std::back_inserter(out),
                   [](From x) { return translate<To>(x); });
    return out;
}

sp<GraphicBuffer> allocateClearSlotBuffer() {
    if (!sysprop::clear_slots_with_set_layer_buffer(false)) {
        return nullptr;
    }
    sp<GraphicBuffer> buffer = sp<GraphicBuffer>::make(1, 1, PIXEL_FORMAT_RGBX_8888,
                                                       GraphicBuffer::USAGE_HW_COMPOSER |
                                                               GraphicBuffer::USAGE_SW_READ_OFTEN |
                                                               GraphicBuffer::USAGE_SW_WRITE_OFTEN,
                                                       "HidlComposer");
    if (!buffer || buffer->initCheck() != ::android::OK) {
        return nullptr;
    }
    return std::move(buffer);
}

} // anonymous namespace

HidlComposer::HidlComposer(const std::string& serviceName)
      : mClearSlotBuffer(allocateClearSlotBuffer()), mWriter(kWriterInitialSize) {
    mComposer = V2_1::IComposer::getService(serviceName);

    if (mComposer == nullptr) {
        LOG_ALWAYS_FATAL("failed to get hwcomposer service");
    }

    if (sp<IComposer> composer_2_4 = IComposer::castFrom(mComposer)) {
        composer_2_4->createClient_2_4([&](const auto& tmpError, const auto& tmpClient) {
            if (tmpError == V2_4::Error::NONE) {
                mClient = tmpClient;
                mClient_2_2 = tmpClient;
                mClient_2_3 = tmpClient;
                mClient_2_4 = tmpClient;
            }
        });
    } else if (sp<V2_3::IComposer> composer_2_3 = V2_3::IComposer::castFrom(mComposer)) {
        composer_2_3->createClient_2_3([&](const auto& tmpError, const auto& tmpClient) {
            if (tmpError == Error::NONE) {
                mClient = tmpClient;
                mClient_2_2 = tmpClient;
                mClient_2_3 = tmpClient;
            }
        });
    } else {
        mComposer->createClient([&](const auto& tmpError, const auto& tmpClient) {
            if (tmpError != Error::NONE) {
                return;
            }

            mClient = tmpClient;
            if (sp<V2_2::IComposer> composer_2_2 = V2_2::IComposer::castFrom(mComposer)) {
                mClient_2_2 = V2_2::IComposerClient::castFrom(mClient);
                LOG_ALWAYS_FATAL_IF(mClient_2_2 == nullptr,
                                    "IComposer 2.2 did not return IComposerClient 2.2");
            }
        });
    }

    if (mClient == nullptr) {
        LOG_ALWAYS_FATAL("failed to create composer client");
    }

    if (!mClearSlotBuffer && sysprop::clear_slots_with_set_layer_buffer(false)) {
        LOG_ALWAYS_FATAL("Failed to allocate a buffer for clearing layer buffer slots");
        return;
    }
}

bool HidlComposer::isSupported(OptionalFeature feature) const {
    switch (feature) {
        case OptionalFeature::RefreshRateSwitching:
            return mClient_2_4 != nullptr;
        case OptionalFeature::ExpectedPresentTime:
        case OptionalFeature::DisplayBrightnessCommand:
        case OptionalFeature::KernelIdleTimer:
        case OptionalFeature::PhysicalDisplayOrientation:
            return false;
    }
}

bool HidlComposer::getDisplayConfigurationsSupported() const {
    // getDisplayConfigurations is not supported on the HIDL composer.
    return false;
};

std::vector<Capability> HidlComposer::getCapabilities() {
    std::vector<Capability> capabilities;
    mComposer->getCapabilities([&](const auto& tmpCapabilities) {
        capabilities = translate<Capability>(tmpCapabilities);
    });
    return capabilities;
}

std::string HidlComposer::dumpDebugInfo() {
    std::string info;
    mComposer->dumpDebugInfo([&](const auto& tmpInfo) { info = tmpInfo.c_str(); });

    return info;
}

void HidlComposer::registerCallback(const sp<IComposerCallback>& callback) {
    android::hardware::setMinSchedulerPolicy(callback, SCHED_FIFO, 2);

    auto ret = [&]() {
        if (mClient_2_4) {
            return mClient_2_4->registerCallback_2_4(callback);
        }
        return mClient->registerCallback(callback);
    }();
    if (!ret.isOk()) {
        ALOGE("failed to register IComposerCallback");
    }
}

Error HidlComposer::executeCommands(Display) {
    return execute();
}

uint32_t HidlComposer::getMaxVirtualDisplayCount() {
    auto ret = mClient->getMaxVirtualDisplayCount();
    return unwrapRet(ret, 0);
}

Error HidlComposer::createVirtualDisplay(uint32_t width, uint32_t height, PixelFormat* format,
                                         Display* outDisplay) {
    const uint32_t bufferSlotCount = 1;
    Error error = kDefaultError;
    if (mClient_2_2) {
        mClient_2_2->createVirtualDisplay_2_2(width, height,
                                              static_cast<types::V1_1::PixelFormat>(*format),
                                              bufferSlotCount,
                                              [&](const auto& tmpError, const auto& tmpDisplay,
                                                  const auto& tmpFormat) {
                                                  error = tmpError;
                                                  if (error != Error::NONE) {
                                                      return;
                                                  }

                                                  *outDisplay = tmpDisplay;
                                                  *format = static_cast<types::V1_2::PixelFormat>(
                                                          tmpFormat);
                                              });
    } else {
        mClient->createVirtualDisplay(width, height, static_cast<types::V1_0::PixelFormat>(*format),
                                      bufferSlotCount,
                                      [&](const auto& tmpError, const auto& tmpDisplay,
                                          const auto& tmpFormat) {
                                          error = tmpError;
                                          if (error != Error::NONE) {
                                              return;
                                          }

                                          *outDisplay = tmpDisplay;
                                          *format = static_cast<PixelFormat>(tmpFormat);
                                      });
    }

    return error;
}

Error HidlComposer::destroyVirtualDisplay(Display display) {
    auto ret = mClient->destroyVirtualDisplay(display);
    return unwrapRet(ret);
}

Error HidlComposer::acceptDisplayChanges(Display display) {
    mWriter.selectDisplay(display);
    mWriter.acceptDisplayChanges();
    return Error::NONE;
}

Error HidlComposer::createLayer(Display display, Layer* outLayer) {
    Error error = kDefaultError;
    mClient->createLayer(display, kMaxLayerBufferCount,
                         [&](const auto& tmpError, const auto& tmpLayer) {
                             error = tmpError;
                             if (error != Error::NONE) {
                                 return;
                             }

                             *outLayer = tmpLayer;
                         });

    return error;
}

Error HidlComposer::destroyLayer(Display display, Layer layer) {
    auto ret = mClient->destroyLayer(display, layer);
    return unwrapRet(ret);
}

Error HidlComposer::getActiveConfig(Display display, Config* outConfig) {
    Error error = kDefaultError;
    mClient->getActiveConfig(display, [&](const auto& tmpError, const auto& tmpConfig) {
        error = tmpError;
        if (error != Error::NONE) {
            return;
        }

        *outConfig = tmpConfig;
    });

    return error;
}

Error HidlComposer::getChangedCompositionTypes(
        Display display, std::vector<Layer>* outLayers,
        std::vector<aidl::android::hardware::graphics::composer3::Composition>* outTypes) {
    mReader.takeChangedCompositionTypes(display, outLayers, outTypes);
    return Error::NONE;
}

Error HidlComposer::getColorModes(Display display, std::vector<ColorMode>* outModes) {
    Error error = kDefaultError;

    if (mClient_2_3) {
        mClient_2_3->getColorModes_2_3(display, [&](const auto& tmpError, const auto& tmpModes) {
            error = tmpError;
            if (error != Error::NONE) {
                return;
            }

            *outModes = tmpModes;
        });
    } else if (mClient_2_2) {
        mClient_2_2->getColorModes_2_2(display, [&](const auto& tmpError, const auto& tmpModes) {
            error = tmpError;
            if (error != Error::NONE) {
                return;
            }

            for (types::V1_1::ColorMode colorMode : tmpModes) {
                outModes->push_back(static_cast<ColorMode>(colorMode));
            }
        });
    } else {
        mClient->getColorModes(display, [&](const auto& tmpError, const auto& tmpModes) {
            error = tmpError;
            if (error != Error::NONE) {
                return;
            }
            for (types::V1_0::ColorMode colorMode : tmpModes) {
                outModes->push_back(static_cast<ColorMode>(colorMode));
            }
        });
    }

    return error;
}

Error HidlComposer::getDisplayAttribute(Display display, Config config,
                                        IComposerClient::Attribute attribute, int32_t* outValue) {
    Error error = kDefaultError;
    if (mClient_2_4) {
        mClient_2_4->getDisplayAttribute_2_4(display, config, attribute,
                                             [&](const auto& tmpError, const auto& tmpValue) {
                                                 error = static_cast<Error>(tmpError);
                                                 if (error != Error::NONE) {
                                                     return;
                                                 }

                                                 *outValue = tmpValue;
                                             });
    } else {
        mClient->getDisplayAttribute(display, config,
                                     static_cast<V2_1::IComposerClient::Attribute>(attribute),
                                     [&](const auto& tmpError, const auto& tmpValue) {
                                         error = tmpError;
                                         if (error != Error::NONE) {
                                             return;
                                         }

                                         *outValue = tmpValue;
                                     });
    }

    return error;
}

Error HidlComposer::getDisplayConfigs(Display display, std::vector<Config>* outConfigs) {
    Error error = kDefaultError;
    mClient->getDisplayConfigs(display, [&](const auto& tmpError, const auto& tmpConfigs) {
        error = tmpError;
        if (error != Error::NONE) {
            return;
        }

        *outConfigs = tmpConfigs;
    });

    return error;
}

Error HidlComposer::getDisplayConfigurations(Display, int32_t /*maxFrameIntervalNs*/,
                                             std::vector<DisplayConfiguration>*) {
    LOG_ALWAYS_FATAL("getDisplayConfigurations should not have been called on this, as "
                     "it's a HWC3 interface version 3 feature");
}

Error HidlComposer::getDisplayName(Display display, std::string* outName) {
    Error error = kDefaultError;
    mClient->getDisplayName(display, [&](const auto& tmpError, const auto& tmpName) {
        error = tmpError;
        if (error != Error::NONE) {
            return;
        }

        *outName = tmpName.c_str();
    });

    return error;
}

Error HidlComposer::getDisplayRequests(Display display, uint32_t* outDisplayRequestMask,
                                       std::vector<Layer>* outLayers,
                                       std::vector<uint32_t>* outLayerRequestMasks) {
    mReader.takeDisplayRequests(display, outDisplayRequestMask, outLayers, outLayerRequestMasks);
    return Error::NONE;
}

Error HidlComposer::getDozeSupport(Display display, bool* outSupport) {
    Error error = kDefaultError;
    mClient->getDozeSupport(display, [&](const auto& tmpError, const auto& tmpSupport) {
        error = tmpError;
        if (error != Error::NONE) {
            return;
        }

        *outSupport = tmpSupport;
    });

    return error;
}

Error HidlComposer::hasDisplayIdleTimerCapability(Display, bool*) {
    LOG_ALWAYS_FATAL("hasDisplayIdleTimerCapability should have never been called on this as "
                     "OptionalFeature::KernelIdleTimer is not supported on HIDL");
}

Error HidlComposer::getHdrCapabilities(Display display, std::vector<Hdr>* outHdrTypes,
                                       float* outMaxLuminance, float* outMaxAverageLuminance,
                                       float* outMinLuminance) {
    Error error = kDefaultError;
    if (mClient_2_3) {
        mClient_2_3->getHdrCapabilities_2_3(display,
                                            [&](const auto& tmpError, const auto& tmpHdrTypes,
                                                const auto& tmpMaxLuminance,
                                                const auto& tmpMaxAverageLuminance,
                                                const auto& tmpMinLuminance) {
                                                error = tmpError;
                                                if (error != Error::NONE) {
                                                    return;
                                                }
                                                *outHdrTypes = translate<ui::Hdr>(tmpHdrTypes);

                                                *outMaxLuminance = tmpMaxLuminance;
                                                *outMaxAverageLuminance = tmpMaxAverageLuminance;
                                                *outMinLuminance = tmpMinLuminance;
                                            });
    } else {
        mClient->getHdrCapabilities(display,
                                    [&](const auto& tmpError, const auto& tmpHdrTypes,
                                        const auto& tmpMaxLuminance,
                                        const auto& tmpMaxAverageLuminance,
                                        const auto& tmpMinLuminance) {
                                        error = tmpError;
                                        if (error != Error::NONE) {
                                            return;
                                        }
                                        *outHdrTypes = translate<ui::Hdr>(tmpHdrTypes);

                                        *outMaxLuminance = tmpMaxLuminance;
                                        *outMaxAverageLuminance = tmpMaxAverageLuminance;
                                        *outMinLuminance = tmpMinLuminance;
                                    });
    }

    return error;
}

Error HidlComposer::getOverlaySupport(OverlayProperties* /*outProperties*/) {
    return Error::NONE;
}

Error HidlComposer::getReleaseFences(Display display, std::vector<Layer>* outLayers,
                                     std::vector<int>* outReleaseFences) {
    mReader.takeReleaseFences(display, outLayers, outReleaseFences);
    return Error::NONE;
}

Error HidlComposer::presentDisplay(Display display, int* outPresentFence) {
    ATRACE_NAME("HwcPresentDisplay");
    mWriter.selectDisplay(display);
    mWriter.presentDisplay();

    Error error = execute();
    if (error != Error::NONE) {
        return error;
    }

    mReader.takePresentFence(display, outPresentFence);

    return Error::NONE;
}

Error HidlComposer::setActiveConfig(Display display, Config config) {
    auto ret = mClient->setActiveConfig(display, config);
    return unwrapRet(ret);
}

Error HidlComposer::setClientTarget(Display display, uint32_t slot, const sp<GraphicBuffer>& target,
                                    int acquireFence, Dataspace dataspace,
                                    const std::vector<IComposerClient::Rect>& damage) {
    mWriter.selectDisplay(display);

    const native_handle_t* handle = nullptr;
    if (target.get()) {
        handle = target->getNativeBuffer()->handle;
    }

    mWriter.setClientTarget(slot, handle, acquireFence, dataspace, damage);
    return Error::NONE;
}

Error HidlComposer::setColorMode(Display display, ColorMode mode, RenderIntent renderIntent) {
    hardware::Return<Error> ret(kDefaultError);
    if (mClient_2_3) {
        ret = mClient_2_3->setColorMode_2_3(display, mode, renderIntent);
    } else if (mClient_2_2) {
        ret = mClient_2_2->setColorMode_2_2(display, static_cast<types::V1_1::ColorMode>(mode),
                                            renderIntent);
    } else {
        ret = mClient->setColorMode(display, static_cast<types::V1_0::ColorMode>(mode));
    }
    return unwrapRet(ret);
}

Error HidlComposer::setColorTransform(Display display, const float* matrix) {
    mWriter.selectDisplay(display);
    const bool isIdentity = (mat4(matrix) == mat4());
    mWriter.setColorTransform(matrix,
                              isIdentity ? ColorTransform::IDENTITY
                                         : ColorTransform::ARBITRARY_MATRIX);
    return Error::NONE;
}

Error HidlComposer::setOutputBuffer(Display display, const native_handle_t* buffer,
                                    int releaseFence) {
    mWriter.selectDisplay(display);
    mWriter.setOutputBuffer(0, buffer, dup(releaseFence));
    return Error::NONE;
}

Error HidlComposer::setPowerMode(Display display, IComposerClient::PowerMode mode) {
    Return<Error> ret(Error::UNSUPPORTED);
    if (mClient_2_2) {
        ret = mClient_2_2->setPowerMode_2_2(display, mode);
    } else if (mode != IComposerClient::PowerMode::ON_SUSPEND) {
        ret = mClient->setPowerMode(display, static_cast<V2_1::IComposerClient::PowerMode>(mode));
    }

    return unwrapRet(ret);
}

Error HidlComposer::setVsyncEnabled(Display display, IComposerClient::Vsync enabled) {
    auto ret = mClient->setVsyncEnabled(display, enabled);
    return unwrapRet(ret);
}

Error HidlComposer::setClientTargetSlotCount(Display display) {
    const uint32_t bufferSlotCount = BufferQueue::NUM_BUFFER_SLOTS;
    auto ret = mClient->setClientTargetSlotCount(display, bufferSlotCount);
    return unwrapRet(ret);
}

Error HidlComposer::validateDisplay(Display display, nsecs_t /*expectedPresentTime*/,
                                    uint32_t* outNumTypes, uint32_t* outNumRequests) {
    ATRACE_NAME("HwcValidateDisplay");
    mWriter.selectDisplay(display);
    mWriter.validateDisplay();

    Error error = execute();
    if (error != Error::NONE) {
        return error;
    }

    mReader.hasChanges(display, outNumTypes, outNumRequests);

    return Error::NONE;
}

Error HidlComposer::presentOrValidateDisplay(Display display, nsecs_t /*expectedPresentTime*/,
                                             int32_t /*frameIntervalNs*/, uint32_t* outNumTypes,
                                             uint32_t* outNumRequests, int* outPresentFence,
                                             uint32_t* state) {
    ATRACE_NAME("HwcPresentOrValidateDisplay");
    mWriter.selectDisplay(display);
    mWriter.presentOrvalidateDisplay();

    Error error = execute();
    if (error != Error::NONE) {
        return error;
    }

    mReader.takePresentOrValidateStage(display, state);

    if (*state == 1) { // Present succeeded
        mReader.takePresentFence(display, outPresentFence);
    }

    if (*state == 0) { // Validate succeeded.
        mReader.hasChanges(display, outNumTypes, outNumRequests);
    }

    return Error::NONE;
}

Error HidlComposer::setCursorPosition(Display display, Layer layer, int32_t x, int32_t y) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerCursorPosition(x, y);
    return Error::NONE;
}

Error HidlComposer::setLayerBuffer(Display display, Layer layer, uint32_t slot,
                                   const sp<GraphicBuffer>& buffer, int acquireFence) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);

    const native_handle_t* handle = nullptr;
    if (buffer.get()) {
        handle = buffer->getNativeBuffer()->handle;
    }

    mWriter.setLayerBuffer(slot, handle, acquireFence);
    return Error::NONE;
}

Error HidlComposer::setLayerBufferSlotsToClear(Display display, Layer layer,
                                               const std::vector<uint32_t>& slotsToClear,
                                               uint32_t activeBufferSlot) {
    if (slotsToClear.empty()) {
        return Error::NONE;
    }
    // This can be null when the HAL hasn't explicitly enabled this feature.
    if (mClearSlotBuffer == nullptr) {
        return Error::NONE;
    }
    //  Backwards compatible way of clearing buffer is to set the layer buffer with a placeholder
    // buffer, using the slot that needs to cleared... tricky.
    for (uint32_t slot : slotsToClear) {
        // Don't clear the active buffer slot because we need to restore the active buffer after
        // setting the requested buffer slots with a placeholder buffer.
        if (slot != activeBufferSlot) {
            mWriter.selectDisplay(display);
            mWriter.selectLayer(layer);
            mWriter.setLayerBuffer(slot, mClearSlotBuffer->handle, /*fence*/ -1);
        }
    }
    // Since we clear buffers by setting them to a placeholder buffer, we want to make sure that the
    // last setLayerBuffer command is sent with the currently active buffer, not the placeholder
    // buffer, so that there is no perceptual change.
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerBuffer(activeBufferSlot, /*buffer*/ nullptr, /*fence*/ -1);
    return Error::NONE;
}

Error HidlComposer::setLayerSurfaceDamage(Display display, Layer layer,
                                          const std::vector<IComposerClient::Rect>& damage) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerSurfaceDamage(damage);
    return Error::NONE;
}

Error HidlComposer::setLayerBlendMode(Display display, Layer layer,
                                      IComposerClient::BlendMode mode) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerBlendMode(mode);
    return Error::NONE;
}

static IComposerClient::Color to_hidl_type(
        aidl::android::hardware::graphics::composer3::Color color) {
    const auto floatColorToUint8Clamped = [](float val) -> uint8_t {
        const auto intVal = static_cast<uint64_t>(std::round(255.0f * val));
        const auto minVal = static_cast<uint64_t>(0);
        const auto maxVal = static_cast<uint64_t>(255);
        return std::clamp(intVal, minVal, maxVal);
    };

    return IComposerClient::Color{
            floatColorToUint8Clamped(color.r),
            floatColorToUint8Clamped(color.g),
            floatColorToUint8Clamped(color.b),
            floatColorToUint8Clamped(color.a),
    };
}

Error HidlComposer::setLayerColor(
        Display display, Layer layer,
        const aidl::android::hardware::graphics::composer3::Color& color) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerColor(to_hidl_type(color));
    return Error::NONE;
}

static IComposerClient::Composition to_hidl_type(
        aidl::android::hardware::graphics::composer3::Composition type) {
    LOG_ALWAYS_FATAL_IF(static_cast<int32_t>(type) >
                                static_cast<int32_t>(IComposerClient::Composition::SIDEBAND),
                        "Trying to use %s, which is not supported by HidlComposer!",
                        android::to_string(type).c_str());

    return static_cast<IComposerClient::Composition>(type);
}

Error HidlComposer::setLayerCompositionType(
        Display display, Layer layer,
        aidl::android::hardware::graphics::composer3::Composition type) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerCompositionType(to_hidl_type(type));
    return Error::NONE;
}

Error HidlComposer::setLayerDataspace(Display display, Layer layer, Dataspace dataspace) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerDataspace(dataspace);
    return Error::NONE;
}

Error HidlComposer::setLayerDisplayFrame(Display display, Layer layer,
                                         const IComposerClient::Rect& frame) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerDisplayFrame(frame);
    return Error::NONE;
}

Error HidlComposer::setLayerPlaneAlpha(Display display, Layer layer, float alpha) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerPlaneAlpha(alpha);
    return Error::NONE;
}

Error HidlComposer::setLayerSidebandStream(Display display, Layer layer,
                                           const native_handle_t* stream) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerSidebandStream(stream);
    return Error::NONE;
}

Error HidlComposer::setLayerSourceCrop(Display display, Layer layer,
                                       const IComposerClient::FRect& crop) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerSourceCrop(crop);
    return Error::NONE;
}

Error HidlComposer::setLayerTransform(Display display, Layer layer, Transform transform) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerTransform(transform);
    return Error::NONE;
}

Error HidlComposer::setLayerVisibleRegion(Display display, Layer layer,
                                          const std::vector<IComposerClient::Rect>& visible) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerVisibleRegion(visible);
    return Error::NONE;
}

Error HidlComposer::setLayerZOrder(Display display, Layer layer, uint32_t z) {
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerZOrder(z);
    return Error::NONE;
}

Error HidlComposer::execute() {
    // prepare input command queue
    bool queueChanged = false;
    uint32_t commandLength = 0;
    hidl_vec<hidl_handle> commandHandles;
    if (!mWriter.writeQueue(&queueChanged, &commandLength, &commandHandles)) {
        mWriter.reset();
        return Error::NO_RESOURCES;
    }

    // set up new input command queue if necessary
    if (queueChanged) {
        auto ret = mClient->setInputCommandQueue(*mWriter.getMQDescriptor());
        auto error = unwrapRet(ret);
        if (error != Error::NONE) {
            mWriter.reset();
            return error;
        }
    }

    if (commandLength == 0) {
        mWriter.reset();
        return Error::NONE;
    }

    Error error = kDefaultError;
    hardware::Return<void> ret;
    auto hidl_callback = [&](const auto& tmpError, const auto& tmpOutChanged,
                             const auto& tmpOutLength, const auto& tmpOutHandles) {
        error = tmpError;

        // set up new output command queue if necessary
        if (error == Error::NONE && tmpOutChanged) {
            error = kDefaultError;
            mClient->getOutputCommandQueue([&](const auto& tmpError, const auto& tmpDescriptor) {
                error = tmpError;
                if (error != Error::NONE) {
                    return;
                }

                mReader.setMQDescriptor(tmpDescriptor);
            });
        }

        if (error != Error::NONE) {
            return;
        }

        if (mReader.readQueue(tmpOutLength, tmpOutHandles)) {
            error = mReader.parse();
            mReader.reset();
        } else {
            error = Error::NO_RESOURCES;
        }
    };
    if (mClient_2_2) {
        ret = mClient_2_2->executeCommands_2_2(commandLength, commandHandles, hidl_callback);
    } else {
        ret = mClient->executeCommands(commandLength, commandHandles, hidl_callback);
    }
    // executeCommands can fail because of out-of-fd and we do not want to
    // abort() in that case
    if (!ret.isOk()) {
        ALOGE("executeCommands failed because of %s", ret.description().c_str());
    }

    if (error == Error::NONE) {
        std::vector<CommandReader::CommandError> commandErrors = mReader.takeErrors();

        for (const auto& cmdErr : commandErrors) {
            auto command =
                    static_cast<IComposerClient::Command>(mWriter.getCommand(cmdErr.location));

            if (command == IComposerClient::Command::VALIDATE_DISPLAY ||
                command == IComposerClient::Command::PRESENT_DISPLAY ||
                command == IComposerClient::Command::PRESENT_OR_VALIDATE_DISPLAY) {
                error = cmdErr.error;
            } else {
                ALOGW("command 0x%x generated error %d", command, cmdErr.error);
            }
        }
    }

    mWriter.reset();

    return error;
}

// Composer HAL 2.2

Error HidlComposer::setLayerPerFrameMetadata(
        Display display, Layer layer,
        const std::vector<IComposerClient::PerFrameMetadata>& perFrameMetadatas) {
    if (!mClient_2_2) {
        return Error::UNSUPPORTED;
    }

    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerPerFrameMetadata(perFrameMetadatas);
    return Error::NONE;
}

std::vector<IComposerClient::PerFrameMetadataKey> HidlComposer::getPerFrameMetadataKeys(
        Display display) {
    std::vector<IComposerClient::PerFrameMetadataKey> keys;
    if (!mClient_2_2) {
        return keys;
    }

    Error error = kDefaultError;
    if (mClient_2_3) {
        mClient_2_3->getPerFrameMetadataKeys_2_3(display,
                                                 [&](const auto& tmpError, const auto& tmpKeys) {
                                                     error = tmpError;
                                                     if (error != Error::NONE) {
                                                         ALOGW("getPerFrameMetadataKeys failed "
                                                               "with %d",
                                                               tmpError);
                                                         return;
                                                     }
                                                     keys = tmpKeys;
                                                 });
    } else {
        mClient_2_2
                ->getPerFrameMetadataKeys(display, [&](const auto& tmpError, const auto& tmpKeys) {
                    error = tmpError;
                    if (error != Error::NONE) {
                        ALOGW("getPerFrameMetadataKeys failed with %d", tmpError);
                        return;
                    }

                    keys.clear();
                    for (auto key : tmpKeys) {
                        keys.push_back(static_cast<IComposerClient::PerFrameMetadataKey>(key));
                    }
                });
    }

    return keys;
}

Error HidlComposer::getRenderIntents(Display display, ColorMode colorMode,
                                     std::vector<RenderIntent>* outRenderIntents) {
    if (!mClient_2_2) {
        outRenderIntents->push_back(RenderIntent::COLORIMETRIC);
        return Error::NONE;
    }

    Error error = kDefaultError;

    auto getRenderIntentsLambda = [&](const auto& tmpError, const auto& tmpKeys) {
        error = tmpError;
        if (error != Error::NONE) {
            return;
        }

        *outRenderIntents = tmpKeys;
    };

    if (mClient_2_3) {
        mClient_2_3->getRenderIntents_2_3(display, colorMode, getRenderIntentsLambda);
    } else {
        mClient_2_2->getRenderIntents(display, static_cast<types::V1_1::ColorMode>(colorMode),
                                      getRenderIntentsLambda);
    }

    return error;
}

Error HidlComposer::getDataspaceSaturationMatrix(Dataspace dataspace, mat4* outMatrix) {
    if (!mClient_2_2) {
        *outMatrix = mat4();
        return Error::NONE;
    }

    Error error = kDefaultError;
    mClient_2_2->getDataspaceSaturationMatrix(static_cast<types::V1_1::Dataspace>(dataspace),
                                              [&](const auto& tmpError, const auto& tmpMatrix) {
                                                  error = tmpError;
                                                  if (error != Error::NONE) {
                                                      return;
                                                  }
                                                  *outMatrix = mat4(tmpMatrix.data());
                                              });

    return error;
}

// Composer HAL 2.3

Error HidlComposer::getDisplayIdentificationData(Display display, uint8_t* outPort,
                                                 std::vector<uint8_t>* outData) {
    if (!mClient_2_3) {
        return Error::UNSUPPORTED;
    }

    Error error = kDefaultError;
    mClient_2_3->getDisplayIdentificationData(display,
                                              [&](const auto& tmpError, const auto& tmpPort,
                                                  const auto& tmpData) {
                                                  error = tmpError;
                                                  if (error != Error::NONE) {
                                                      return;
                                                  }

                                                  *outPort = tmpPort;
                                                  *outData = tmpData;
                                              });

    return error;
}

Error HidlComposer::setLayerColorTransform(Display display, Layer layer, const float* matrix) {
    if (!mClient_2_3) {
        return Error::UNSUPPORTED;
    }

    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerColorTransform(matrix);
    return Error::NONE;
}

Error HidlComposer::getDisplayedContentSamplingAttributes(Display display, PixelFormat* outFormat,
                                                          Dataspace* outDataspace,
                                                          uint8_t* outComponentMask) {
    if (!outFormat || !outDataspace || !outComponentMask) {
        return Error::BAD_PARAMETER;
    }
    if (!mClient_2_3) {
        return Error::UNSUPPORTED;
    }
    Error error = kDefaultError;
    mClient_2_3->getDisplayedContentSamplingAttributes(display,
                                                       [&](const auto tmpError,
                                                           const auto& tmpFormat,
                                                           const auto& tmpDataspace,
                                                           const auto& tmpComponentMask) {
                                                           error = tmpError;
                                                           if (error == Error::NONE) {
                                                               *outFormat = tmpFormat;
                                                               *outDataspace = tmpDataspace;
                                                               *outComponentMask =
                                                                       static_cast<uint8_t>(
                                                                               tmpComponentMask);
                                                           }
                                                       });
    return error;
}

Error HidlComposer::setDisplayContentSamplingEnabled(Display display, bool enabled,
                                                     uint8_t componentMask, uint64_t maxFrames) {
    if (!mClient_2_3) {
        return Error::UNSUPPORTED;
    }

    auto enable = enabled ? V2_3::IComposerClient::DisplayedContentSampling::ENABLE
                          : V2_3::IComposerClient::DisplayedContentSampling::DISABLE;
    return mClient_2_3->setDisplayedContentSamplingEnabled(display, enable, componentMask,
                                                           maxFrames);
}

Error HidlComposer::getDisplayedContentSample(Display display, uint64_t maxFrames,
                                              uint64_t timestamp, DisplayedFrameStats* outStats) {
    if (!outStats) {
        return Error::BAD_PARAMETER;
    }
    if (!mClient_2_3) {
        return Error::UNSUPPORTED;
    }
    Error error = kDefaultError;
    mClient_2_3->getDisplayedContentSample(display, maxFrames, timestamp,
                                           [&](const auto tmpError, auto tmpNumFrames,
                                               const auto& tmpSamples0, const auto& tmpSamples1,
                                               const auto& tmpSamples2, const auto& tmpSamples3) {
                                               error = tmpError;
                                               if (error == Error::NONE) {
                                                   outStats->numFrames = tmpNumFrames;
                                                   outStats->component_0_sample = tmpSamples0;
                                                   outStats->component_1_sample = tmpSamples1;
                                                   outStats->component_2_sample = tmpSamples2;
                                                   outStats->component_3_sample = tmpSamples3;
                                               }
                                           });
    return error;
}

Error HidlComposer::setLayerPerFrameMetadataBlobs(
        Display display, Layer layer,
        const std::vector<IComposerClient::PerFrameMetadataBlob>& metadata) {
    if (!mClient_2_3) {
        return Error::UNSUPPORTED;
    }

    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerPerFrameMetadataBlobs(metadata);
    return Error::NONE;
}

Error HidlComposer::setDisplayBrightness(Display display, float brightness, float,
                                         const DisplayBrightnessOptions&) {
    if (!mClient_2_3) {
        return Error::UNSUPPORTED;
    }
    return mClient_2_3->setDisplayBrightness(display, brightness);
}

// Composer HAL 2.4

Error HidlComposer::getDisplayCapabilities(Display display,
                                           std::vector<DisplayCapability>* outCapabilities) {
    if (!mClient_2_3) {
        return Error::UNSUPPORTED;
    }

    V2_4::Error error = kDefaultError_2_4;
    if (mClient_2_4) {
        mClient_2_4->getDisplayCapabilities_2_4(display,
                                                [&](const auto& tmpError, const auto& tmpCaps) {
                                                    error = tmpError;
                                                    if (error != V2_4::Error::NONE) {
                                                        return;
                                                    }
                                                    *outCapabilities =
                                                            translate<DisplayCapability>(tmpCaps);
                                                });
    } else {
        mClient_2_3
                ->getDisplayCapabilities(display, [&](const auto& tmpError, const auto& tmpCaps) {
                    error = static_cast<V2_4::Error>(tmpError);
                    if (error != V2_4::Error::NONE) {
                        return;
                    }

                    *outCapabilities = translate<DisplayCapability>(tmpCaps);
                });
    }

    return static_cast<Error>(error);
}

V2_4::Error HidlComposer::getDisplayConnectionType(
        Display display, IComposerClient::DisplayConnectionType* outType) {
    using Error = V2_4::Error;
    if (!mClient_2_4) {
        return Error::UNSUPPORTED;
    }

    Error error = kDefaultError_2_4;
    mClient_2_4->getDisplayConnectionType(display, [&](const auto& tmpError, const auto& tmpType) {
        error = tmpError;
        if (error != V2_4::Error::NONE) {
            return;
        }

        *outType = tmpType;
    });

    return error;
}

V2_4::Error HidlComposer::getDisplayVsyncPeriod(Display display, VsyncPeriodNanos* outVsyncPeriod) {
    using Error = V2_4::Error;
    if (!mClient_2_4) {
        return Error::UNSUPPORTED;
    }

    Error error = kDefaultError_2_4;
    mClient_2_4->getDisplayVsyncPeriod(display,
                                       [&](const auto& tmpError, const auto& tmpVsyncPeriod) {
                                           error = tmpError;
                                           if (error != Error::NONE) {
                                               return;
                                           }

                                           *outVsyncPeriod = tmpVsyncPeriod;
                                       });

    return error;
}

V2_4::Error HidlComposer::setActiveConfigWithConstraints(
        Display display, Config config,
        const IComposerClient::VsyncPeriodChangeConstraints& vsyncPeriodChangeConstraints,
        VsyncPeriodChangeTimeline* outTimeline) {
    using Error = V2_4::Error;
    if (!mClient_2_4) {
        return Error::UNSUPPORTED;
    }

    Error error = kDefaultError_2_4;
    mClient_2_4->setActiveConfigWithConstraints(display, config, vsyncPeriodChangeConstraints,
                                                [&](const auto& tmpError, const auto& tmpTimeline) {
                                                    error = tmpError;
                                                    if (error != Error::NONE) {
                                                        return;
                                                    }

                                                    *outTimeline = tmpTimeline;
                                                });

    return error;
}

V2_4::Error HidlComposer::setAutoLowLatencyMode(Display display, bool on) {
    using Error = V2_4::Error;
    if (!mClient_2_4) {
        return Error::UNSUPPORTED;
    }

    return mClient_2_4->setAutoLowLatencyMode(display, on);
}

V2_4::Error HidlComposer::getSupportedContentTypes(
        Display displayId, std::vector<IComposerClient::ContentType>* outSupportedContentTypes) {
    using Error = V2_4::Error;
    if (!mClient_2_4) {
        return Error::UNSUPPORTED;
    }

    Error error = kDefaultError_2_4;
    mClient_2_4->getSupportedContentTypes(displayId,
                                          [&](const auto& tmpError,
                                              const auto& tmpSupportedContentTypes) {
                                              error = tmpError;
                                              if (error != Error::NONE) {
                                                  return;
                                              }

                                              *outSupportedContentTypes = tmpSupportedContentTypes;
                                          });
    return error;
}

V2_4::Error HidlComposer::setContentType(Display display,
                                         IComposerClient::ContentType contentType) {
    using Error = V2_4::Error;
    if (!mClient_2_4) {
        return Error::UNSUPPORTED;
    }

    return mClient_2_4->setContentType(display, contentType);
}

V2_4::Error HidlComposer::setLayerGenericMetadata(Display display, Layer layer,
                                                  const std::string& key, bool mandatory,
                                                  const std::vector<uint8_t>& value) {
    using Error = V2_4::Error;
    if (!mClient_2_4) {
        return Error::UNSUPPORTED;
    }
    mWriter.selectDisplay(display);
    mWriter.selectLayer(layer);
    mWriter.setLayerGenericMetadata(key, mandatory, value);
    return Error::NONE;
}

V2_4::Error HidlComposer::getLayerGenericMetadataKeys(
        std::vector<IComposerClient::LayerGenericMetadataKey>* outKeys) {
    using Error = V2_4::Error;
    if (!mClient_2_4) {
        return Error::UNSUPPORTED;
    }
    Error error = kDefaultError_2_4;
    mClient_2_4->getLayerGenericMetadataKeys([&](const auto& tmpError, const auto& tmpKeys) {
        error = tmpError;
        if (error != Error::NONE) {
            return;
        }

        *outKeys = tmpKeys;
    });
    return error;
}

Error HidlComposer::setBootDisplayConfig(Display /*displayId*/, Config) {
    return Error::UNSUPPORTED;
}

Error HidlComposer::clearBootDisplayConfig(Display /*displayId*/) {
    return Error::UNSUPPORTED;
}

Error HidlComposer::getPreferredBootDisplayConfig(Display /*displayId*/, Config*) {
    return Error::UNSUPPORTED;
}

Error HidlComposer::getHdrConversionCapabilities(std::vector<HdrConversionCapability>*) {
    return Error::UNSUPPORTED;
}

Error HidlComposer::setHdrConversionStrategy(HdrConversionStrategy, Hdr*) {
    return Error::UNSUPPORTED;
}

Error HidlComposer::setRefreshRateChangedCallbackDebugEnabled(Display, bool) {
    return Error::UNSUPPORTED;
}

Error HidlComposer::notifyExpectedPresent(Display, nsecs_t, int32_t) {
    return Error::UNSUPPORTED;
}

Error HidlComposer::getClientTargetProperty(
        Display display, ClientTargetPropertyWithBrightness* outClientTargetProperty) {
    IComposerClient::ClientTargetProperty property;
    mReader.takeClientTargetProperty(display, &property);
    outClientTargetProperty->display = display;
    outClientTargetProperty->clientTargetProperty.dataspace =
            static_cast<::aidl::android::hardware::graphics::common::Dataspace>(property.dataspace);
    outClientTargetProperty->clientTargetProperty.pixelFormat =
            static_cast<::aidl::android::hardware::graphics::common::PixelFormat>(
                    property.pixelFormat);
    outClientTargetProperty->brightness = 1.f;
    outClientTargetProperty->dimmingStage = DimmingStage::NONE;
    return Error::NONE;
}

Error HidlComposer::setLayerBrightness(Display, Layer, float) {
    return Error::NONE;
}

Error HidlComposer::setLayerBlockingRegion(Display, Layer,
                                           const std::vector<IComposerClient::Rect>&) {
    return Error::NONE;
}

Error HidlComposer::getDisplayDecorationSupport(
        Display,
        std::optional<aidl::android::hardware::graphics::common::DisplayDecorationSupport>*
                support) {
    support->reset();
    return Error::UNSUPPORTED;
}

Error HidlComposer::setIdleTimerEnabled(Display, std::chrono::milliseconds) {
    LOG_ALWAYS_FATAL("setIdleTimerEnabled should have never been called on this as "
                     "OptionalFeature::KernelIdleTimer is not supported on HIDL");
}

Error HidlComposer::getPhysicalDisplayOrientation(Display, AidlTransform*) {
    LOG_ALWAYS_FATAL("getPhysicalDisplayOrientation should have never been called on this as "
                     "OptionalFeature::PhysicalDisplayOrientation is not supported on HIDL");
}

void HidlComposer::registerCallback(ComposerCallback& callback) {
    const bool vsyncSwitchingSupported =
            isSupported(Hwc2::Composer::OptionalFeature::RefreshRateSwitching);

    registerCallback(sp<ComposerCallbackBridge>::make(callback, vsyncSwitchingSupported));
}

void HidlComposer::onHotplugConnect(Display) {}
void HidlComposer::onHotplugDisconnect(Display) {}

CommandReader::~CommandReader() {
    resetData();
}

Error CommandReader::parse() {
    resetData();

    IComposerClient::Command command;
    uint16_t length = 0;

    while (!isEmpty()) {
        if (!beginCommand(&command, &length)) {
            break;
        }

        bool parsed = false;
        switch (command) {
            case IComposerClient::Command::SELECT_DISPLAY:
                parsed = parseSelectDisplay(length);
                break;
            case IComposerClient::Command::SET_ERROR:
                parsed = parseSetError(length);
                break;
            case IComposerClient::Command::SET_CHANGED_COMPOSITION_TYPES:
                parsed = parseSetChangedCompositionTypes(length);
                break;
            case IComposerClient::Command::SET_DISPLAY_REQUESTS:
                parsed = parseSetDisplayRequests(length);
                break;
            case IComposerClient::Command::SET_PRESENT_FENCE:
                parsed = parseSetPresentFence(length);
                break;
            case IComposerClient::Command::SET_RELEASE_FENCES:
                parsed = parseSetReleaseFences(length);
                break;
            case IComposerClient::Command ::SET_PRESENT_OR_VALIDATE_DISPLAY_RESULT:
                parsed = parseSetPresentOrValidateDisplayResult(length);
                break;
            case IComposerClient::Command::SET_CLIENT_TARGET_PROPERTY:
                parsed = parseSetClientTargetProperty(length);
                break;
            default:
                parsed = false;
                break;
        }

        endCommand();

        if (!parsed) {
            ALOGE("failed to parse command 0x%x length %" PRIu16, command, length);
            break;
        }
    }

    return isEmpty() ? Error::NONE : Error::NO_RESOURCES;
}

bool CommandReader::parseSelectDisplay(uint16_t length) {
    if (length != CommandWriterBase::kSelectDisplayLength) {
        return false;
    }

    mCurrentReturnData = &mReturnData[read64()];

    return true;
}

bool CommandReader::parseSetError(uint16_t length) {
    if (length != CommandWriterBase::kSetErrorLength) {
        return false;
    }

    auto location = read();
    auto error = static_cast<Error>(readSigned());

    mErrors.emplace_back(CommandError{location, error});

    return true;
}

bool CommandReader::parseSetChangedCompositionTypes(uint16_t length) {
    // (layer id, composition type) pairs
    if (length % 3 != 0 || !mCurrentReturnData) {
        return false;
    }

    uint32_t count = length / 3;
    mCurrentReturnData->changedLayers.reserve(count);
    mCurrentReturnData->compositionTypes.reserve(count);
    while (count > 0) {
        auto layer = read64();
        auto type = static_cast<aidl::android::hardware::graphics::composer3::Composition>(
                readSigned());

        mCurrentReturnData->changedLayers.push_back(layer);
        mCurrentReturnData->compositionTypes.push_back(type);

        count--;
    }

    return true;
}

bool CommandReader::parseSetDisplayRequests(uint16_t length) {
    // display requests followed by (layer id, layer requests) pairs
    if (length % 3 != 1 || !mCurrentReturnData) {
        return false;
    }

    mCurrentReturnData->displayRequests = read();

    uint32_t count = (length - 1) / 3;
    mCurrentReturnData->requestedLayers.reserve(count);
    mCurrentReturnData->requestMasks.reserve(count);
    while (count > 0) {
        auto layer = read64();
        auto layerRequestMask = read();

        mCurrentReturnData->requestedLayers.push_back(layer);
        mCurrentReturnData->requestMasks.push_back(layerRequestMask);

        count--;
    }

    return true;
}

bool CommandReader::parseSetPresentFence(uint16_t length) {
    if (length != CommandWriterBase::kSetPresentFenceLength || !mCurrentReturnData) {
        return false;
    }

    if (mCurrentReturnData->presentFence >= 0) {
        close(mCurrentReturnData->presentFence);
    }
    mCurrentReturnData->presentFence = readFence();

    return true;
}

bool CommandReader::parseSetReleaseFences(uint16_t length) {
    // (layer id, release fence index) pairs
    if (length % 3 != 0 || !mCurrentReturnData) {
        return false;
    }

    uint32_t count = length / 3;
    mCurrentReturnData->releasedLayers.reserve(count);
    mCurrentReturnData->releaseFences.reserve(count);
    while (count > 0) {
        auto layer = read64();
        auto fence = readFence();

        mCurrentReturnData->releasedLayers.push_back(layer);
        mCurrentReturnData->releaseFences.push_back(fence);

        count--;
    }

    return true;
}

bool CommandReader::parseSetPresentOrValidateDisplayResult(uint16_t length) {
    if (length != CommandWriterBase::kPresentOrValidateDisplayResultLength || !mCurrentReturnData) {
        return false;
    }
    mCurrentReturnData->presentOrValidateState = read();
    return true;
}

bool CommandReader::parseSetClientTargetProperty(uint16_t length) {
    if (length != CommandWriterBase::kSetClientTargetPropertyLength || !mCurrentReturnData) {
        return false;
    }
    mCurrentReturnData->clientTargetProperty.pixelFormat = static_cast<PixelFormat>(readSigned());
    mCurrentReturnData->clientTargetProperty.dataspace = static_cast<Dataspace>(readSigned());
    return true;
}

void CommandReader::resetData() {
    mErrors.clear();

    for (auto& data : mReturnData) {
        if (data.second.presentFence >= 0) {
            close(data.second.presentFence);
        }
        for (auto fence : data.second.releaseFences) {
            if (fence >= 0) {
                close(fence);
            }
        }
    }

    mReturnData.clear();
    mCurrentReturnData = nullptr;
}

std::vector<CommandReader::CommandError> CommandReader::takeErrors() {
    return std::move(mErrors);
}

bool CommandReader::hasChanges(Display display, uint32_t* outNumChangedCompositionTypes,
                               uint32_t* outNumLayerRequestMasks) const {
    auto found = mReturnData.find(display);
    if (found == mReturnData.end()) {
        *outNumChangedCompositionTypes = 0;
        *outNumLayerRequestMasks = 0;
        return false;
    }

    const ReturnData& data = found->second;

    *outNumChangedCompositionTypes = data.compositionTypes.size();
    *outNumLayerRequestMasks = data.requestMasks.size();

    return !(data.compositionTypes.empty() && data.requestMasks.empty());
}

void CommandReader::takeChangedCompositionTypes(
        Display display, std::vector<Layer>* outLayers,
        std::vector<aidl::android::hardware::graphics::composer3::Composition>* outTypes) {
    auto found = mReturnData.find(display);
    if (found == mReturnData.end()) {
        outLayers->clear();
        outTypes->clear();
        return;
    }

    ReturnData& data = found->second;

    *outLayers = std::move(data.changedLayers);
    *outTypes = std::move(data.compositionTypes);
}

void CommandReader::takeDisplayRequests(Display display, uint32_t* outDisplayRequestMask,
                                        std::vector<Layer>* outLayers,
                                        std::vector<uint32_t>* outLayerRequestMasks) {
    auto found = mReturnData.find(display);
    if (found == mReturnData.end()) {
        *outDisplayRequestMask = 0;
        outLayers->clear();
        outLayerRequestMasks->clear();
        return;
    }

    ReturnData& data = found->second;

    *outDisplayRequestMask = data.displayRequests;
    *outLayers = std::move(data.requestedLayers);
    *outLayerRequestMasks = std::move(data.requestMasks);
}

void CommandReader::takeReleaseFences(Display display, std::vector<Layer>* outLayers,
                                      std::vector<int>* outReleaseFences) {
    auto found = mReturnData.find(display);
    if (found == mReturnData.end()) {
        outLayers->clear();
        outReleaseFences->clear();
        return;
    }

    ReturnData& data = found->second;

    *outLayers = std::move(data.releasedLayers);
    *outReleaseFences = std::move(data.releaseFences);
}

void CommandReader::takePresentFence(Display display, int* outPresentFence) {
    auto found = mReturnData.find(display);
    if (found == mReturnData.end()) {
        *outPresentFence = -1;
        return;
    }

    ReturnData& data = found->second;

    *outPresentFence = data.presentFence;
    data.presentFence = -1;
}

void CommandReader::takePresentOrValidateStage(Display display, uint32_t* state) {
    auto found = mReturnData.find(display);
    if (found == mReturnData.end()) {
        *state = -1;
        return;
    }
    ReturnData& data = found->second;
    *state = data.presentOrValidateState;
}

void CommandReader::takeClientTargetProperty(
        Display display, IComposerClient::ClientTargetProperty* outClientTargetProperty) {
    auto found = mReturnData.find(display);

    // If not found, return the default values.
    if (found == mReturnData.end()) {
        outClientTargetProperty->pixelFormat = PixelFormat::RGBA_8888;
        outClientTargetProperty->dataspace = Dataspace::UNKNOWN;
        return;
    }

    ReturnData& data = found->second;
    *outClientTargetProperty = data.clientTargetProperty;
}

} // namespace Hwc2
} // namespace android

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