/*
 * Copyright 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "HostFrameComposer.h"

#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <hardware/hwcomposer2.h>
#include <poll.h>
#include <sync/sync.h>
#include <ui/GraphicBuffer.h>

#include <optional>
#include <tuple>

#include "Sync.h"
#include "gfxstream/guest/goldfish_sync.h"
#include "Display.h"
#include "HostUtils.h"
#include "virtgpu_drm.h"

namespace aidl::android::hardware::graphics::composer3::impl {
namespace {

hwc_rect AsHwcRect(const common::Rect& rect) {
    hwc_rect out;
    out.left = rect.left;
    out.top = rect.top;
    out.right = rect.right;
    out.bottom = rect.bottom;
    return out;
}

hwc_frect AsHwcFrect(const common::FRect& rect) {
    hwc_frect out;
    out.left = rect.left;
    out.top = rect.top;
    out.right = rect.right;
    out.bottom = rect.bottom;
    return out;
}

hwc_color AsHwcColor(const Color& color) {
    hwc_color out;
    out.r = static_cast<uint8_t>(color.r * 255.0f);
    out.g = static_cast<uint8_t>(color.g * 255.0f);
    out.b = static_cast<uint8_t>(color.b * 255.0f);
    out.a = static_cast<uint8_t>(color.a * 255.0f);
    return out;
}

hwc_transform_t AsHwcTransform(const common::Transform& transform) {
    switch (transform) {
        case common::Transform::NONE:
            return static_cast<hwc_transform_t>(0);
        case common::Transform::FLIP_H:
            return HWC_TRANSFORM_FLIP_H;
        case common::Transform::FLIP_V:
            return HWC_TRANSFORM_FLIP_V;
        case common::Transform::ROT_90:
            return HWC_TRANSFORM_ROT_90;
        case common::Transform::ROT_180:
            return HWC_TRANSFORM_ROT_180;
        case common::Transform::ROT_270:
            return HWC_TRANSFORM_ROT_270;
    }
}

static bool isMinigbmFromProperty() {
    static constexpr const auto kGrallocProp = "ro.hardware.gralloc";

    const auto grallocProp = ::android::base::GetProperty(kGrallocProp, "");
    DEBUG_LOG("%s: prop value is: %s", __FUNCTION__, grallocProp.c_str());

    if (grallocProp == "minigbm") {
        DEBUG_LOG("%s: Using minigbm, in minigbm mode.\n", __FUNCTION__);
        return true;
    } else {
        DEBUG_LOG("%s: Is not using minigbm, in goldfish mode.\n", __FUNCTION__);
        return false;
    }
}

typedef struct compose_layer {
    uint32_t cbHandle;
    hwc2_composition_t composeMode;
    hwc_rect_t displayFrame;
    hwc_frect_t crop;
    int32_t blendMode;
    float alpha;
    hwc_color_t color;
    hwc_transform_t transform;
} ComposeLayer;

typedef struct compose_device {
    uint32_t version;
    uint32_t targetHandle;
    uint32_t numLayers;
    struct compose_layer layer[0];
} ComposeDevice;

typedef struct compose_device_v2 {
    uint32_t version;
    uint32_t displayId;
    uint32_t targetHandle;
    uint32_t numLayers;
    struct compose_layer layer[0];
} ComposeDevice_v2;

class ComposeMsg {
   public:
    ComposeMsg(uint32_t layerCnt = 0)
        : mData(sizeof(ComposeDevice) + layerCnt * sizeof(ComposeLayer)) {
        mComposeDevice = reinterpret_cast<ComposeDevice*>(mData.data());
        mLayerCnt = layerCnt;
    }

    ComposeDevice* get() { return mComposeDevice; }

    uint32_t getLayerCnt() { return mLayerCnt; }

   private:
    std::vector<uint8_t> mData;
    uint32_t mLayerCnt;
    ComposeDevice* mComposeDevice;
};

class ComposeMsg_v2 {
   public:
    ComposeMsg_v2(uint32_t layerCnt = 0)
        : mData(sizeof(ComposeDevice_v2) + layerCnt * sizeof(ComposeLayer)) {
        mComposeDevice = reinterpret_cast<ComposeDevice_v2*>(mData.data());
        mLayerCnt = layerCnt;
    }

    ComposeDevice_v2* get() { return mComposeDevice; }

    uint32_t getLayerCnt() { return mLayerCnt; }

   private:
    std::vector<uint8_t> mData;
    uint32_t mLayerCnt;
    ComposeDevice_v2* mComposeDevice;
};

}  // namespace

HWC3::Error HostFrameComposer::init() {
    mIsMinigbm = isMinigbmFromProperty();

    if (mIsMinigbm) {
        mDrmClient.emplace();

        HWC3::Error error = mDrmClient->init();
        if (error != HWC3::Error::None) {
            ALOGE("%s: failed to initialize DrmClient", __FUNCTION__);
            return error;
        }

	mSyncHelper.reset(gfxstream::createPlatformSyncHelper());
    } else {
        mSyncDeviceFd = goldfish_sync_open();
    }

    return HWC3::Error::None;
}

HWC3::Error HostFrameComposer::registerOnHotplugCallback(const HotplugCallback& cb) {
    if (mDrmClient) {
        mDrmClient->registerOnHotplugCallback(cb);
    }
    return HWC3::Error::None;
}

HWC3::Error HostFrameComposer::unregisterOnHotplugCallback() {
    if (mDrmClient) {
        mDrmClient->unregisterOnHotplugCallback();
    }
    return HWC3::Error::None;
}

HWC3::Error HostFrameComposer::createHostComposerDisplayInfo(Display* display,
                                                             uint32_t hostDisplayId) {
    HWC3::Error error = HWC3::Error::None;

    int64_t displayId = display->getId();
    int32_t displayConfigId;
    int32_t displayWidth;
    int32_t displayHeight;

    error = display->getActiveConfig(&displayConfigId);
    if (error != HWC3::Error::None) {
        ALOGE("%s: display:%" PRIu64 " has no active config", __FUNCTION__, displayId);
        return error;
    }

    error = display->getDisplayAttribute(displayConfigId, DisplayAttribute::WIDTH, &displayWidth);
    if (error != HWC3::Error::None) {
        ALOGE("%s: display:%" PRIu64 " failed to get width", __FUNCTION__, displayId);
        return error;
    }

    error = display->getDisplayAttribute(displayConfigId, DisplayAttribute::HEIGHT, &displayHeight);
    if (error != HWC3::Error::None) {
        ALOGE("%s: display:%" PRIu64 " failed to get height", __FUNCTION__, displayId);
        return error;
    }

    HostComposerDisplayInfo& displayInfo = mDisplayInfos[displayId];

    displayInfo.hostDisplayId = hostDisplayId;
    displayInfo.swapchain = DrmSwapchain::create(
        static_cast<uint32_t>(displayWidth), static_cast<uint32_t>(displayHeight),
        ::android::GraphicBuffer::USAGE_HW_COMPOSER | ::android::GraphicBuffer::USAGE_HW_RENDER,
        mDrmClient ? &mDrmClient.value() : nullptr);
    if (!displayInfo.swapchain) {
        ALOGE("%s: display:%" PRIu64 " failed to allocate swapchain", __FUNCTION__, displayId);
        return HWC3::Error::NoResources;
    }
    return HWC3::Error::None;
}

HWC3::Error HostFrameComposer::onDisplayCreate(Display* display) {
    HWC3::Error error = HWC3::Error::None;

    const uint32_t displayId = static_cast<uint32_t>(display->getId());
    int32_t displayConfigId;
    int32_t displayWidth;
    int32_t displayHeight;
    int32_t displayDpiX;

    error = display->getActiveConfig(&displayConfigId);
    if (error != HWC3::Error::None) {
        ALOGE("%s: display:%" PRIu32 " has no active config", __FUNCTION__, displayId);
        return error;
    }

    error = display->getDisplayAttribute(displayConfigId, DisplayAttribute::WIDTH, &displayWidth);
    if (error != HWC3::Error::None) {
        ALOGE("%s: display:%" PRIu32 " failed to get width", __FUNCTION__, displayId);
        return error;
    }

    error = display->getDisplayAttribute(displayConfigId, DisplayAttribute::HEIGHT, &displayHeight);
    if (error != HWC3::Error::None) {
        ALOGE("%s: display:%" PRIu32 " failed to get height", __FUNCTION__, displayId);
        return error;
    }

    error = display->getDisplayAttribute(displayConfigId, DisplayAttribute::DPI_X, &displayDpiX);
    if (error != HWC3::Error::None) {
        ALOGE("%s: display:%" PRIu32 " failed to get height", __FUNCTION__, displayId);
        return error;
    }

    uint32_t hostDisplayId = 0;

    DEFINE_AND_VALIDATE_HOST_CONNECTION
    if (displayId == 0) {
        // Primary display:
        hostCon->lock();
        if (rcEnc->rcCreateDisplayById(rcEnc, displayId)) {
            ALOGE("%s host failed to create display %" PRIu32, __func__, displayId);
            hostCon->unlock();
            return HWC3::Error::NoResources;
        }
        if (rcEnc->rcSetDisplayPoseDpi(
                rcEnc, displayId, -1, -1, static_cast<uint32_t>(displayWidth),
                static_cast<uint32_t>(displayHeight), static_cast<uint32_t>(displayDpiX / 1000))) {
            ALOGE("%s host failed to set display %" PRIu32, __func__, displayId);
            hostCon->unlock();
            return HWC3::Error::NoResources;
        }
        hostCon->unlock();
    } else {
        // Secondary display:
        static constexpr const uint32_t kHostDisplayIdStart = 6;

        uint32_t expectedHostDisplayId = kHostDisplayIdStart + displayId - 1;
        uint32_t actualHostDisplayId = 0;

        hostCon->lock();
        rcEnc->rcDestroyDisplay(rcEnc, expectedHostDisplayId);
        rcEnc->rcCreateDisplay(rcEnc, &actualHostDisplayId);
        rcEnc->rcSetDisplayPose(rcEnc, actualHostDisplayId, -1, -1,
                                static_cast<uint32_t>(displayWidth),
                                static_cast<uint32_t>(displayHeight));
        hostCon->unlock();

        if (actualHostDisplayId != expectedHostDisplayId) {
            ALOGE(
                "Something wrong with host displayId allocation, expected %d "
                "but received %d",
                expectedHostDisplayId, actualHostDisplayId);
        }

        hostDisplayId = actualHostDisplayId;
    }

    error = createHostComposerDisplayInfo(display, hostDisplayId);
    if (error != HWC3::Error::None) {
        ALOGE("%s failed to initialize host info for display:%" PRIu32, __FUNCTION__, displayId);
        return error;
    }

    std::optional<std::vector<uint8_t>> edid;
    if (mDrmClient) {
        edid = mDrmClient->getEdid(displayId);
        if (edid) {
            display->setEdid(*edid);
        }
    }

    return HWC3::Error::None;
}

HWC3::Error HostFrameComposer::onDisplayDestroy(Display* display) {
    int64_t displayId = display->getId();

    auto it = mDisplayInfos.find(displayId);
    if (it == mDisplayInfos.end()) {
        ALOGE("%s: display:%" PRIu64 " missing display buffers?", __FUNCTION__, displayId);
        return HWC3::Error::BadDisplay;
    }

    HostComposerDisplayInfo& displayInfo = mDisplayInfos[displayId];

    if (displayId != 0) {
        DEFINE_AND_VALIDATE_HOST_CONNECTION
        hostCon->lock();
        rcEnc->rcDestroyDisplay(rcEnc, displayInfo.hostDisplayId);
        hostCon->unlock();
    }

    mDisplayInfos.erase(it);

    return HWC3::Error::None;
}

HWC3::Error HostFrameComposer::onDisplayClientTargetSet(Display* display) {
    int64_t displayId = display->getId();

    auto it = mDisplayInfos.find(displayId);
    if (it == mDisplayInfos.end()) {
        ALOGE("%s: display:%" PRIu64 " missing display buffers?", __FUNCTION__, displayId);
        return HWC3::Error::BadDisplay;
    }

    HostComposerDisplayInfo& displayInfo = mDisplayInfos[displayId];

    if (mIsMinigbm) {
        FencedBuffer& clientTargetFencedBuffer = display->getClientTarget();

        auto [drmBufferCreateError, drmBuffer] =
            mDrmClient->create(clientTargetFencedBuffer.getBuffer());
        if (drmBufferCreateError != HWC3::Error::None) {
            ALOGE("%s: display:%" PRIu64 " failed to create client target drm buffer", __FUNCTION__,
                  displayId);
            return HWC3::Error::NoResources;
        }
        displayInfo.clientTargetDrmBuffer = std::move(drmBuffer);
    }

    return HWC3::Error::None;
}

HWC3::Error HostFrameComposer::validateDisplay(Display* display, DisplayChanges* outChanges) {
    const auto& displayId = display->getId();

    DEFINE_AND_VALIDATE_HOST_CONNECTION
    hostCon->lock();
    bool hostCompositionV1 = rcEnc->hasHostCompositionV1();
    bool hostCompositionV2 = rcEnc->hasHostCompositionV2();
    hostCon->unlock();

    const std::vector<Layer*> layers = display->getOrderedLayers();
    for (const auto& layer : layers) {
        switch (layer->getCompositionType()) {
            case Composition::INVALID:
                // Log error for unused layers, layer leak?
                ALOGE("%s layer:%" PRIu64 " CompositionType not set", __FUNCTION__, layer->getId());
                break;
            case Composition::DISPLAY_DECORATION:
                return HWC3::Error::Unsupported;
            default:
                break;
        }
    }

    // If one layer requires a fall back to the client composition type, all
    // layers will fall back to the client composition type.
    bool fallBackToClient =
        (!hostCompositionV1 && !hostCompositionV2);
    std::unordered_map<Layer*, Composition> changes;

    if (!fallBackToClient) {
        for (const auto& layer : layers) {
            const auto& layerCompositionType = layer->getCompositionType();
            const auto layerCompositionTypeString = toString(layerCompositionType);

            std::optional<Composition> layerFallBackTo = std::nullopt;
            switch (layerCompositionType) {
                case Composition::CLIENT:
                case Composition::SIDEBAND:
                    ALOGV("%s: layer %" PRIu32 " CompositionType %s, fallback to client",
                          __FUNCTION__, static_cast<uint32_t>(layer->getId()),
                          layerCompositionTypeString.c_str());
                    layerFallBackTo = Composition::CLIENT;
                    break;
                case Composition::CURSOR:
                    ALOGV("%s: layer %" PRIu32 " CompositionType %s, fallback to device",
                          __FUNCTION__, static_cast<uint32_t>(layer->getId()),
                          layerCompositionTypeString.c_str());
                    layerFallBackTo = Composition::DEVICE;
                    break;
                case Composition::INVALID:
                case Composition::DEVICE:
                case Composition::SOLID_COLOR:
                    layerFallBackTo = std::nullopt;
                    break;
                default:
                    ALOGE("%s: layer %" PRIu32 " has an unknown composition type: %s", __FUNCTION__,
                          static_cast<uint32_t>(layer->getId()), layerCompositionTypeString.c_str());
            }
            if (layerFallBackTo == Composition::CLIENT) {
                fallBackToClient = true;
            }
            if (layerFallBackTo.has_value()) {
                changes.emplace(layer, layerFallBackTo.value());
            }
        }
    }

    if (fallBackToClient) {
        changes.clear();
        for (auto& layer : layers) {
            if (layer->getCompositionType() == Composition::INVALID) {
                continue;
            }
            if (layer->getCompositionType() != Composition::CLIENT) {
                changes.emplace(layer, Composition::CLIENT);
            }
        }
    }

    outChanges->clearLayerCompositionChanges();
    for (auto& [layer, newCompositionType] : changes) {
        layer->logCompositionFallbackIfChanged(newCompositionType);
        outChanges->addLayerCompositionChange(displayId, layer->getId(), newCompositionType);
    }

    return HWC3::Error::None;
}

HWC3::Error HostFrameComposer::presentDisplay(
    Display* display, ::android::base::unique_fd* outDisplayFence,
    std::unordered_map<int64_t, ::android::base::unique_fd>* outLayerFences) {
    const uint32_t displayId = static_cast<uint32_t>(display->getId());
    auto displayInfoIt = mDisplayInfos.find(displayId);
    if (displayInfoIt == mDisplayInfos.end()) {
        ALOGE("%s: failed to find display buffers for display:%" PRIu32, __FUNCTION__, displayId);
        return HWC3::Error::BadDisplay;
    }

    HostComposerDisplayInfo& displayInfo = displayInfoIt->second;

    HostConnection* hostCon;
    ExtendedRCEncoderContext* rcEnc;
    HWC3::Error error = getAndValidateHostConnection(&hostCon, &rcEnc);
    if (error != HWC3::Error::None) {
        return error;
    }
    *outDisplayFence = ::android::base::unique_fd();
    hostCon->lock();
    bool hostCompositionV1 = rcEnc->hasHostCompositionV1();
    bool hostCompositionV2 = rcEnc->hasHostCompositionV2();
    hostCon->unlock();

    // Ff we supports v2, then discard v1
    if (hostCompositionV2) {
        hostCompositionV1 = false;
    }

    auto compositionResult = displayInfo.swapchain->getNextImage();
    compositionResult->wait();

    const std::vector<Layer*> layers = display->getOrderedLayers();
    if (hostCompositionV2 || hostCompositionV1) {
        uint32_t numLayer = 0;
        for (auto layer : layers) {
            if (layer->getCompositionType() == Composition::DEVICE ||
                layer->getCompositionType() == Composition::SOLID_COLOR) {
                numLayer++;
            }
        }

        DEBUG_LOG("%s: presenting display:%" PRIu32 " with %d layers", __FUNCTION__, displayId,
                  static_cast<int>(layers.size()));

        if (numLayer == 0) {
            ALOGV("%s display has no layers to compose, flushing client target buffer.",
                  __FUNCTION__);

            FencedBuffer& displayClientTarget = display->getClientTarget();
            if (displayClientTarget.getBuffer() != nullptr) {
                ::android::base::unique_fd fence = displayClientTarget.getFence();
                if (mIsMinigbm) {
                    auto [_, flushCompleteFence] = mDrmClient->flushToDisplay(
                        displayId, displayInfo.clientTargetDrmBuffer, fence);

                    *outDisplayFence = std::move(flushCompleteFence);
                } else {
                    post(hostCon, rcEnc, displayInfo.hostDisplayId, displayClientTarget.getBuffer());
                    *outDisplayFence = std::move(fence);
                }
            }
            return HWC3::Error::None;
        }

        std::unique_ptr<ComposeMsg> composeMsg;
        std::unique_ptr<ComposeMsg_v2> composeMsgV2;

        if (hostCompositionV1) {
            composeMsg.reset(new ComposeMsg(numLayer));
        } else {
            composeMsgV2.reset(new ComposeMsg_v2(numLayer));
        }

        // Handle the composition
        ComposeDevice* p;
        ComposeDevice_v2* p2;
        ComposeLayer* l;

        if (hostCompositionV1) {
            p = composeMsg->get();
            l = p->layer;
        } else {
            p2 = composeMsgV2->get();
            l = p2->layer;
        }

        std::vector<int64_t> releaseLayerIds;
        for (auto layer : layers) {
            const auto& layerCompositionType = layer->getCompositionType();
            const auto layerCompositionTypeString = toString(layerCompositionType);

            // TODO: use local var composisitonType to store getCompositionType()
            if (layerCompositionType != Composition::DEVICE &&
                layerCompositionType != Composition::SOLID_COLOR) {
                ALOGE("%s: Unsupported composition type %s layer %u", __FUNCTION__,
                      layerCompositionTypeString.c_str(), (uint32_t)layer->getId());
                continue;
            }
            // send layer composition command to host
            if (layerCompositionType == Composition::DEVICE) {
                releaseLayerIds.emplace_back(layer->getId());

                ::android::base::unique_fd fence = layer->getBuffer().getFence();
                if (fence.ok()) {
                    int err = sync_wait(fence.get(), 3000);
                    if (err < 0 && errno == ETIME) {
                        ALOGE("%s waited on fence %d for 3000 ms", __FUNCTION__, fence.get());
                    }

#if GOLDFISH_OPENGL_SYNC_DEBUG
		    mSyncHelper->debugPrint(fence.get());
#endif
                } else {
                    ALOGV("%s: acquire fence not set for layer %u", __FUNCTION__,
                          (uint32_t)layer->getId());
                }
                const native_handle_t* cb = layer->getBuffer().getBuffer();
                if (cb != nullptr) {
                    l->cbHandle = hostCon->grallocHelper()->getHostHandle(cb);
                } else {
                    ALOGE("%s null buffer for layer %d", __FUNCTION__, (uint32_t)layer->getId());
                }
            } else {
                // solidcolor has no buffer
                l->cbHandle = 0;
            }
            l->composeMode = (hwc2_composition_t)layerCompositionType;
            l->displayFrame = AsHwcRect(layer->getDisplayFrame());
            l->crop = AsHwcFrect(layer->getSourceCrop());
            l->blendMode = static_cast<int32_t>(layer->getBlendMode());
            l->alpha = layer->getPlaneAlpha();
            l->color = AsHwcColor(layer->getColor());
            l->transform = AsHwcTransform(layer->getTransform());
            ALOGV(
                "   cb %d blendmode %d alpha %f %d %d %d %d z %d"
                " composeMode %d, transform %d",
                l->cbHandle, l->blendMode, l->alpha, l->displayFrame.left, l->displayFrame.top,
                l->displayFrame.right, l->displayFrame.bottom, layer->getZOrder(), l->composeMode,
                l->transform);
            l++;
        }

        if (hostCompositionV1) {
            p->version = 1;
            p->targetHandle =
                hostCon->grallocHelper()->getHostHandle(compositionResult->getBuffer());
            p->numLayers = numLayer;
        } else {
            p2->version = 2;
            p2->displayId = displayInfo.hostDisplayId;
            p2->targetHandle =
                hostCon->grallocHelper()->getHostHandle(compositionResult->getBuffer());
            p2->numLayers = numLayer;
        }

        void* buffer;
        uint32_t bufferSize;
        if (hostCompositionV1) {
            buffer = (void*)p;
            bufferSize = sizeof(ComposeDevice) + numLayer * sizeof(ComposeLayer);
        } else {
            bufferSize = sizeof(ComposeDevice_v2) + numLayer * sizeof(ComposeLayer);
            buffer = (void*)p2;
        }

        ::android::base::unique_fd retire_fd;
        hostCon->lock();
        if (rcEnc->hasAsyncFrameCommands()) {
            if (mIsMinigbm) {
                rcEnc->rcComposeAsyncWithoutPost(rcEnc, bufferSize, buffer);
            } else {
                rcEnc->rcComposeAsync(rcEnc, bufferSize, buffer);
            }
        } else {
            if (mIsMinigbm) {
                rcEnc->rcComposeWithoutPost(rcEnc, bufferSize, buffer);
            } else {
                rcEnc->rcCompose(rcEnc, bufferSize, buffer);
            }
        }
        hostCon->unlock();

        // Send a retire fence and use it as the release fence for all layers,
        // since media expects it
        EGLint attribs[] = {EGL_SYNC_NATIVE_FENCE_ANDROID, EGL_NO_NATIVE_FENCE_FD_ANDROID};

        uint64_t sync_handle, thread_handle;

        // We don't use rc command to sync if we are using virtio-gpu, which is
        // proxied by minigbm.
        bool useRcCommandToSync = !mIsMinigbm;

        if (useRcCommandToSync) {
            hostCon->lock();
            rcEnc->rcCreateSyncKHR(rcEnc, EGL_SYNC_NATIVE_FENCE_ANDROID, attribs,
                                   2 * sizeof(EGLint), true /* destroy when signaled */,
                                   &sync_handle, &thread_handle);
            hostCon->unlock();
        }

        if (mIsMinigbm) {
            auto [_, fence] =
                mDrmClient->flushToDisplay(displayId, compositionResult->getDrmBuffer(), -1);
            retire_fd = std::move(fence);
        } else {
            int fd;
            goldfish_sync_queue_work(mSyncDeviceFd, sync_handle, thread_handle, &fd);
            retire_fd = ::android::base::unique_fd(fd);
        }

        for (int64_t layerId : releaseLayerIds) {
            (*outLayerFences)[layerId] = ::android::base::unique_fd(dup(retire_fd.get()));
        }
        *outDisplayFence = ::android::base::unique_fd(dup(retire_fd.get()));

        if (useRcCommandToSync) {
            hostCon->lock();
            if (rcEnc->hasAsyncFrameCommands()) {
                rcEnc->rcDestroySyncKHRAsync(rcEnc, sync_handle);
            } else {
                rcEnc->rcDestroySyncKHR(rcEnc, sync_handle);
            }
            hostCon->unlock();
        }
    } else {
        // we set all layers Composition::CLIENT, so do nothing.
        FencedBuffer& displayClientTarget = display->getClientTarget();
        ::android::base::unique_fd displayClientTargetFence = displayClientTarget.getFence();
        if (mIsMinigbm) {
            auto [_, flushFence] = mDrmClient->flushToDisplay(
                displayId, compositionResult->getDrmBuffer(), displayClientTargetFence);
            *outDisplayFence = std::move(flushFence);
        } else {
            post(hostCon, rcEnc, displayInfo.hostDisplayId, displayClientTarget.getBuffer());
            *outDisplayFence = std::move(displayClientTargetFence);
        }
        ALOGV("%s fallback to post, returns outRetireFence %d", __FUNCTION__,
              outDisplayFence->get());
    }
    compositionResult->markAsInUse(outDisplayFence->ok()
                                       ? ::android::base::unique_fd(dup(*outDisplayFence))
                                       : ::android::base::unique_fd());
    return HWC3::Error::None;
}

void HostFrameComposer::post(HostConnection* hostCon, ExtendedRCEncoderContext* rcEnc,
                             uint32_t hostDisplayId, buffer_handle_t h) {
    assert(cb && "native_handle_t::from(h) failed");

    hostCon->lock();
    rcEnc->rcSetDisplayColorBuffer(
        rcEnc, hostDisplayId,
        hostCon->grallocHelper()->getHostHandle(h));
    rcEnc->rcFBPost(rcEnc, hostCon->grallocHelper()->getHostHandle(h));
    hostCon->flush();
    hostCon->unlock();
}

HWC3::Error HostFrameComposer::onActiveConfigChange(Display* display) {
    const uint32_t displayId = static_cast<uint32_t>(display->getId());
    DEBUG_LOG("%s: display:%" PRIu32, __FUNCTION__, displayId);
    HWC3::Error error = createHostComposerDisplayInfo(display, displayId);
    if (error != HWC3::Error::None) {
        ALOGE("%s failed to update host info for display:%" PRIu32, __FUNCTION__, displayId);
        return error;
    }
    return HWC3::Error::None;
}

}  // namespace aidl::android::hardware::graphics::composer3::impl