/*
 * Copyright (C) 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.
 */

//#define LOG_NDEBUG 0
#define LOG_TAG "C2AllocatorGralloc"
#include <utils/Log.h>

#include <android/hardware/graphics/allocator/2.0/IAllocator.h>
#include <android/hardware/graphics/mapper/2.0/IMapper.h>
#include <cutils/native_handle.h>
#include <hardware/gralloc.h>

#include <C2AllocatorGralloc.h>
#include <C2Buffer.h>
#include <C2PlatformSupport.h>

namespace android {

namespace {
    enum : uint64_t {
        /**
         * Usage mask that is passed through from gralloc to Codec 2.0 usage.
         */
        PASSTHROUGH_USAGE_MASK =
            ~(GRALLOC_USAGE_SW_READ_MASK | GRALLOC_USAGE_SW_WRITE_MASK | GRALLOC_USAGE_PROTECTED)
    };

    // verify that passthrough mask is within the platform mask
    static_assert((~C2MemoryUsage::PLATFORM_MASK & PASSTHROUGH_USAGE_MASK) == 0, "");
}

C2MemoryUsage C2AndroidMemoryUsage::FromGrallocUsage(uint64_t usage) {
    // gralloc does not support WRITE_PROTECTED
    return C2MemoryUsage(
            ((usage & GRALLOC_USAGE_SW_READ_MASK) ? C2MemoryUsage::CPU_READ : 0) |
            ((usage & GRALLOC_USAGE_SW_WRITE_MASK) ? C2MemoryUsage::CPU_WRITE : 0) |
            ((usage & GRALLOC_USAGE_PROTECTED) ? C2MemoryUsage::READ_PROTECTED : 0) |
            (usage & PASSTHROUGH_USAGE_MASK));
}

uint64_t C2AndroidMemoryUsage::asGrallocUsage() const {
    // gralloc does not support WRITE_PROTECTED
    return (((expected & C2MemoryUsage::CPU_READ) ? GRALLOC_USAGE_SW_READ_OFTEN : 0) |
            ((expected & C2MemoryUsage::CPU_WRITE) ? GRALLOC_USAGE_SW_WRITE_OFTEN : 0) |
            ((expected & C2MemoryUsage::READ_PROTECTED) ? GRALLOC_USAGE_PROTECTED : 0) |
            (expected & PASSTHROUGH_USAGE_MASK));
}

using ::android::hardware::graphics::allocator::V2_0::IAllocator;
using ::android::hardware::graphics::common::V1_0::BufferUsage;
using ::android::hardware::graphics::common::V1_0::PixelFormat;
using ::android::hardware::graphics::mapper::V2_0::BufferDescriptor;
using ::android::hardware::graphics::mapper::V2_0::Error;
using ::android::hardware::graphics::mapper::V2_0::IMapper;
using ::android::hardware::graphics::mapper::V2_0::YCbCrLayout;
using ::android::hardware::hidl_handle;
using ::android::hardware::hidl_vec;

namespace {

struct BufferDescriptorInfo {
    IMapper::BufferDescriptorInfo mapperInfo;
    uint32_t stride;
};

}

/* ===================================== GRALLOC ALLOCATION ==================================== */
static c2_status_t maperr2error(Error maperr) {
    switch (maperr) {
        case Error::NONE:           return C2_OK;
        case Error::BAD_DESCRIPTOR: return C2_BAD_VALUE;
        case Error::BAD_BUFFER:     return C2_BAD_VALUE;
        case Error::BAD_VALUE:      return C2_BAD_VALUE;
        case Error::NO_RESOURCES:   return C2_NO_MEMORY;
        case Error::UNSUPPORTED:    return C2_CANNOT_DO;
    }
    return C2_CORRUPTED;
}

static
bool native_handle_is_invalid(const native_handle_t *const handle) {
    // perform basic validation of a native handle
    if (handle == nullptr) {
        // null handle is considered valid
        return false;
    }
    return ((size_t)handle->version != sizeof(native_handle_t) ||
            handle->numFds < 0 ||
            handle->numInts < 0 ||
            // for sanity assume handles must occupy less memory than INT_MAX bytes
            handle->numFds > int((INT_MAX - handle->version) / sizeof(int)) - handle->numInts);
}

class C2HandleGralloc : public C2Handle {
private:
    struct ExtraData {
        uint32_t width;
        uint32_t height;
        uint32_t format;
        uint32_t usage_lo;
        uint32_t usage_hi;
        uint32_t stride;
        uint32_t generation;
        uint32_t igbp_id_lo;
        uint32_t igbp_id_hi;
        uint32_t igbp_slot;
        uint32_t magic;
    };

    enum {
        NUM_INTS = sizeof(ExtraData) / sizeof(int),
    };
    const static uint32_t MAGIC = '\xc2gr\x00';

    static
    const ExtraData* getExtraData(const C2Handle *const handle) {
        if (handle == nullptr
                || native_handle_is_invalid(handle)
                || handle->numInts < NUM_INTS) {
            return nullptr;
        }
        return reinterpret_cast<const ExtraData*>(
                &handle->data[handle->numFds + handle->numInts - NUM_INTS]);
    }

    static
    ExtraData *getExtraData(C2Handle *const handle) {
        return const_cast<ExtraData *>(getExtraData(const_cast<const C2Handle *const>(handle)));
    }

public:
    void getIgbpData(uint32_t *generation, uint64_t *igbp_id, uint32_t *igbp_slot) const {
        const ExtraData *ed = getExtraData(this);
        *generation = ed->generation;
        *igbp_id = unsigned(ed->igbp_id_lo) | uint64_t(unsigned(ed->igbp_id_hi)) << 32;
        *igbp_slot = ed->igbp_slot;
    }

    static bool isValid(const C2Handle *const o) {
        if (o == nullptr) { // null handle is always valid
            return true;
        }
        const ExtraData *xd = getExtraData(o);
        // we cannot validate width/height/format/usage without accessing gralloc driver
        return xd != nullptr && xd->magic == MAGIC;
    }

    static C2HandleGralloc* WrapNativeHandle(
            const native_handle_t *const handle,
            uint32_t width, uint32_t height, uint32_t format, uint64_t usage,
            uint32_t stride, uint32_t generation, uint64_t igbp_id = 0, uint32_t igbp_slot = 0) {
        //CHECK(handle != nullptr);
        if (native_handle_is_invalid(handle) ||
            handle->numInts > int((INT_MAX - handle->version) / sizeof(int)) - NUM_INTS - handle->numFds) {
            return nullptr;
        }
        ExtraData xd = {
            width, height, format, uint32_t(usage & 0xFFFFFFFF), uint32_t(usage >> 32),
            stride, generation, uint32_t(igbp_id & 0xFFFFFFFF), uint32_t(igbp_id >> 32),
            igbp_slot, MAGIC
        };
        native_handle_t *res = native_handle_create(handle->numFds, handle->numInts + NUM_INTS);
        if (res != nullptr) {
            memcpy(&res->data, &handle->data, sizeof(int) * (handle->numFds + handle->numInts));
            *getExtraData(res) = xd;
        }
        return reinterpret_cast<C2HandleGralloc *>(res);
    }

    static native_handle_t* UnwrapNativeHandle(
            const C2Handle *const handle) {
        const ExtraData *xd = getExtraData(handle);
        if (xd == nullptr || xd->magic != MAGIC) {
            return nullptr;
        }
        native_handle_t *res = native_handle_create(handle->numFds, handle->numInts - NUM_INTS);
        if (res != nullptr) {
            memcpy(&res->data, &handle->data, sizeof(int) * (res->numFds + res->numInts));
        }
        return res;
    }

    static native_handle_t* UnwrapNativeHandle(
            const C2Handle *const handle,
            uint32_t *generation, uint64_t *igbp_id, uint32_t *igbp_slot) {
        const ExtraData *xd = getExtraData(handle);
        if (xd == nullptr || xd->magic != MAGIC) {
            return nullptr;
        }
        *generation = xd->generation;
        *igbp_id = unsigned(xd->igbp_id_lo) | uint64_t(unsigned(xd->igbp_id_hi)) << 32;
        *igbp_slot = xd->igbp_slot;
        native_handle_t *res = native_handle_create(handle->numFds, handle->numInts - NUM_INTS);
        if (res != nullptr) {
            memcpy(&res->data, &handle->data, sizeof(int) * (res->numFds + res->numInts));
        }
        return res;
    }

    static const C2HandleGralloc* Import(
            const C2Handle *const handle,
            uint32_t *width, uint32_t *height, uint32_t *format,
            uint64_t *usage, uint32_t *stride,
            uint32_t *generation, uint64_t *igbp_id, uint32_t *igbp_slot) {
        const ExtraData *xd = getExtraData(handle);
        if (xd == nullptr) {
            return nullptr;
        }
        *width = xd->width;
        *height = xd->height;
        *format = xd->format;
        *usage = xd->usage_lo | (uint64_t(xd->usage_hi) << 32);
        *stride = xd->stride;
        *generation = xd->generation;
        *igbp_id = xd->igbp_id_lo | (uint64_t(xd->igbp_id_hi) << 32);
        *igbp_slot = xd->igbp_slot;
        return reinterpret_cast<const C2HandleGralloc *>(handle);
    }
};

native_handle_t *UnwrapNativeCodec2GrallocHandle(const C2Handle *const handle) {
    return C2HandleGralloc::UnwrapNativeHandle(handle);
}

native_handle_t *UnwrapNativeCodec2GrallocHandle(
        const C2Handle *const handle,
        uint32_t *generation, uint64_t *igbp_id, uint32_t *igbp_slot) {
    return C2HandleGralloc::UnwrapNativeHandle(handle, generation, igbp_id, igbp_slot);
}

C2Handle *WrapNativeCodec2GrallocHandle(
        const native_handle_t *const handle,
        uint32_t width, uint32_t height, uint32_t format, uint64_t usage, uint32_t stride,
        uint32_t generation, uint64_t igbp_id, uint32_t igbp_slot) {
    return C2HandleGralloc::WrapNativeHandle(handle, width, height, format, usage, stride,
                                             generation, igbp_id, igbp_slot);
}

class C2AllocationGralloc : public C2GraphicAllocation {
public:
    virtual ~C2AllocationGralloc() override;

    virtual c2_status_t map(
            C2Rect rect, C2MemoryUsage usage, C2Fence *fence,
            C2PlanarLayout *layout /* nonnull */, uint8_t **addr /* nonnull */) override;
    virtual c2_status_t unmap(
            uint8_t **addr /* nonnull */, C2Rect rect, C2Fence *fence /* nullable */) override;
    virtual C2Allocator::id_t getAllocatorId() const override { return mAllocatorId; }
    virtual const C2Handle *handle() const override { return mLockedHandle ? : mHandle; }
    virtual bool equals(const std::shared_ptr<const C2GraphicAllocation> &other) const override;

    // internal methods
    // |handle| will be moved.
    C2AllocationGralloc(
              const BufferDescriptorInfo &info,
              const sp<IMapper> &mapper,
              hidl_handle &hidlHandle,
              const C2HandleGralloc *const handle,
              C2Allocator::id_t allocatorId);
    int dup() const;
    c2_status_t status() const;

private:
    const BufferDescriptorInfo mInfo;
    const sp<IMapper> mMapper;
    const hidl_handle mHidlHandle;
    const C2HandleGralloc *mHandle;
    buffer_handle_t mBuffer;
    const C2HandleGralloc *mLockedHandle;
    bool mLocked;
    C2Allocator::id_t mAllocatorId;
};

C2AllocationGralloc::C2AllocationGralloc(
          const BufferDescriptorInfo &info,
          const sp<IMapper> &mapper,
          hidl_handle &hidlHandle,
          const C2HandleGralloc *const handle,
          C2Allocator::id_t allocatorId)
    : C2GraphicAllocation(info.mapperInfo.width, info.mapperInfo.height),
      mInfo(info),
      mMapper(mapper),
      mHidlHandle(std::move(hidlHandle)),
      mHandle(handle),
      mBuffer(nullptr),
      mLockedHandle(nullptr),
      mLocked(false),
      mAllocatorId(allocatorId) {
}

C2AllocationGralloc::~C2AllocationGralloc() {
    if (mBuffer && mLocked) {
        // implementation ignores addresss and rect
        uint8_t* addr[C2PlanarLayout::MAX_NUM_PLANES] = {};
        unmap(addr, C2Rect(), nullptr);
    }
    if (mBuffer) {
        mMapper->freeBuffer(const_cast<native_handle_t *>(mBuffer));
    }
    if (mHandle) {
        native_handle_delete(
                const_cast<native_handle_t *>(reinterpret_cast<const native_handle_t *>(mHandle)));
    }
}

c2_status_t C2AllocationGralloc::map(
        C2Rect rect, C2MemoryUsage usage, C2Fence *fence,
        C2PlanarLayout *layout /* nonnull */, uint8_t **addr /* nonnull */) {
    uint64_t grallocUsage = static_cast<C2AndroidMemoryUsage>(usage).asGrallocUsage();
    ALOGV("mapping buffer with usage %#llx => %#llx",
          (long long)usage.expected, (long long)grallocUsage);

    // TODO
    (void) fence;

    if (mBuffer && mLocked) {
        ALOGD("already mapped");
        return C2_DUPLICATE;
    }
    if (!layout || !addr) {
        ALOGD("wrong param");
        return C2_BAD_VALUE;
    }

    c2_status_t err = C2_OK;
    if (!mBuffer) {
        mMapper->importBuffer(
                mHidlHandle, [&err, this](const auto &maperr, const auto &buffer) {
                    err = maperr2error(maperr);
                    if (err == C2_OK) {
                        mBuffer = static_cast<buffer_handle_t>(buffer);
                    }
                });
        if (err != C2_OK) {
            ALOGD("importBuffer failed: %d", err);
            return err;
        }
        if (mBuffer == nullptr) {
            ALOGD("importBuffer returned null buffer");
            return C2_CORRUPTED;
        }
        uint32_t generation = 0;
        uint64_t igbp_id = 0;
        uint32_t igbp_slot = 0;
        if (mHandle) {
            mHandle->getIgbpData(&generation, &igbp_id, &igbp_slot);
        }
        mLockedHandle = C2HandleGralloc::WrapNativeHandle(
                mBuffer, mInfo.mapperInfo.width, mInfo.mapperInfo.height,
                (uint32_t)mInfo.mapperInfo.format, mInfo.mapperInfo.usage, mInfo.stride,
                generation, igbp_id, igbp_slot);
    }

    // UGLY HACK: assume YCbCr 4:2:0 8-bit format (and lockable via lockYCbCr) if we don't
    // recognize the format
    PixelFormat format = mInfo.mapperInfo.format;
    if (format != PixelFormat::RGBA_8888 && format != PixelFormat::RGBX_8888) {
        format = PixelFormat::YCBCR_420_888;
    }

    switch (format) {
        case PixelFormat::YCBCR_420_888:
        case PixelFormat::YV12: {
            YCbCrLayout ycbcrLayout;
            mMapper->lockYCbCr(
                    const_cast<native_handle_t *>(mBuffer), grallocUsage,
                    { (int32_t)rect.left, (int32_t)rect.top, (int32_t)rect.width, (int32_t)rect.height },
                    // TODO: fence
                    hidl_handle(),
                    [&err, &ycbcrLayout](const auto &maperr, const auto &mapLayout) {
                        err = maperr2error(maperr);
                        if (err == C2_OK) {
                            ycbcrLayout = mapLayout;
                        }
                    });
            if (err != C2_OK) {
                ALOGD("lockYCbCr failed: %d", err);
                return err;
            }
            addr[C2PlanarLayout::PLANE_Y] = (uint8_t *)ycbcrLayout.y;
            addr[C2PlanarLayout::PLANE_U] = (uint8_t *)ycbcrLayout.cb;
            addr[C2PlanarLayout::PLANE_V] = (uint8_t *)ycbcrLayout.cr;
            layout->type = C2PlanarLayout::TYPE_YUV;
            layout->numPlanes = 3;
            layout->rootPlanes = 3;
            layout->planes[C2PlanarLayout::PLANE_Y] = {
                C2PlaneInfo::CHANNEL_Y,         // channel
                1,                              // colInc
                (int32_t)ycbcrLayout.yStride,   // rowInc
                1,                              // mColSampling
                1,                              // mRowSampling
                8,                              // allocatedDepth
                8,                              // bitDepth
                0,                              // rightShift
                C2PlaneInfo::NATIVE,            // endianness
                C2PlanarLayout::PLANE_Y,        // rootIx
                0,                              // offset
            };
            layout->planes[C2PlanarLayout::PLANE_U] = {
                C2PlaneInfo::CHANNEL_CB,          // channel
                (int32_t)ycbcrLayout.chromaStep,  // colInc
                (int32_t)ycbcrLayout.cStride,     // rowInc
                2,                                // mColSampling
                2,                                // mRowSampling
                8,                                // allocatedDepth
                8,                                // bitDepth
                0,                                // rightShift
                C2PlaneInfo::NATIVE,              // endianness
                C2PlanarLayout::PLANE_U,          // rootIx
                0,                                // offset
            };
            layout->planes[C2PlanarLayout::PLANE_V] = {
                C2PlaneInfo::CHANNEL_CR,          // channel
                (int32_t)ycbcrLayout.chromaStep,  // colInc
                (int32_t)ycbcrLayout.cStride,     // rowInc
                2,                                // mColSampling
                2,                                // mRowSampling
                8,                                // allocatedDepth
                8,                                // bitDepth
                0,                                // rightShift
                C2PlaneInfo::NATIVE,              // endianness
                C2PlanarLayout::PLANE_V,          // rootIx
                0,                                // offset
            };
            // handle interleaved formats
            intptr_t uvOffset = addr[C2PlanarLayout::PLANE_V] - addr[C2PlanarLayout::PLANE_U];
            if (uvOffset > 0 && uvOffset < (intptr_t)ycbcrLayout.chromaStep) {
                layout->rootPlanes = 2;
                layout->planes[C2PlanarLayout::PLANE_V].rootIx = C2PlanarLayout::PLANE_U;
                layout->planes[C2PlanarLayout::PLANE_V].offset = uvOffset;
            } else if (uvOffset < 0 && uvOffset > -(intptr_t)ycbcrLayout.chromaStep) {
                layout->rootPlanes = 2;
                layout->planes[C2PlanarLayout::PLANE_U].rootIx = C2PlanarLayout::PLANE_V;
                layout->planes[C2PlanarLayout::PLANE_U].offset = -uvOffset;
            }
            break;
        }

        case PixelFormat::RGBA_8888:
            // TODO: alpha channel
            // fall-through
        case PixelFormat::RGBX_8888: {
            void *pointer = nullptr;
            mMapper->lock(
                    const_cast<native_handle_t *>(mBuffer),
                    grallocUsage,
                    { (int32_t)rect.left, (int32_t)rect.top, (int32_t)rect.width, (int32_t)rect.height },
                    // TODO: fence
                    hidl_handle(),
                    [&err, &pointer](const auto &maperr, const auto &mapPointer) {
                        err = maperr2error(maperr);
                        if (err == C2_OK) {
                            pointer = mapPointer;
                        }
                    });
            if (err != C2_OK) {
                ALOGD("lock failed: %d", err);
                return err;
            }
            addr[C2PlanarLayout::PLANE_R] = (uint8_t *)pointer;
            addr[C2PlanarLayout::PLANE_G] = (uint8_t *)pointer + 1;
            addr[C2PlanarLayout::PLANE_B] = (uint8_t *)pointer + 2;
            layout->type = C2PlanarLayout::TYPE_RGB;
            layout->numPlanes = 3;
            layout->rootPlanes = 1;
            layout->planes[C2PlanarLayout::PLANE_R] = {
                C2PlaneInfo::CHANNEL_R,         // channel
                4,                              // colInc
                4 * (int32_t)mInfo.stride,      // rowInc
                1,                              // mColSampling
                1,                              // mRowSampling
                8,                              // allocatedDepth
                8,                              // bitDepth
                0,                              // rightShift
                C2PlaneInfo::NATIVE,            // endianness
                C2PlanarLayout::PLANE_R,        // rootIx
                0,                              // offset
            };
            layout->planes[C2PlanarLayout::PLANE_G] = {
                C2PlaneInfo::CHANNEL_G,         // channel
                4,                              // colInc
                4 * (int32_t)mInfo.stride,      // rowInc
                1,                              // mColSampling
                1,                              // mRowSampling
                8,                              // allocatedDepth
                8,                              // bitDepth
                0,                              // rightShift
                C2PlaneInfo::NATIVE,            // endianness
                C2PlanarLayout::PLANE_R,        // rootIx
                1,                              // offset
            };
            layout->planes[C2PlanarLayout::PLANE_B] = {
                C2PlaneInfo::CHANNEL_B,         // channel
                4,                              // colInc
                4 * (int32_t)mInfo.stride,      // rowInc
                1,                              // mColSampling
                1,                              // mRowSampling
                8,                              // allocatedDepth
                8,                              // bitDepth
                0,                              // rightShift
                C2PlaneInfo::NATIVE,            // endianness
                C2PlanarLayout::PLANE_R,        // rootIx
                2,                              // offset
            };
            break;
        }
        default: {
            ALOGD("unsupported pixel format: %d", mInfo.mapperInfo.format);
            return C2_OMITTED;
        }
    }
    mLocked = true;

    return C2_OK;
}

c2_status_t C2AllocationGralloc::unmap(
        uint8_t **addr, C2Rect rect, C2Fence *fence /* nullable */) {
    // TODO: check addr and size, use fence
    (void)addr;
    (void)rect;
    c2_status_t err = C2_OK;
    mMapper->unlock(
            const_cast<native_handle_t *>(mBuffer),
            [&err, &fence](const auto &maperr, const auto &releaseFence) {
                // TODO
                (void) fence;
                (void) releaseFence;
                err = maperr2error(maperr);
                if (err == C2_OK) {
                    // TODO: fence
                }
            });
    if (err == C2_OK) {
        mLocked = false;
    }
    return err;
}

bool C2AllocationGralloc::equals(const std::shared_ptr<const C2GraphicAllocation> &other) const {
    return other && other->handle() == handle();
}

/* ===================================== GRALLOC ALLOCATOR ==================================== */
class C2AllocatorGralloc::Impl {
public:
    Impl(id_t id, bool bufferQueue);

    id_t getId() const {
        return mTraits->id;
    }

    C2String getName() const {
        return mTraits->name;
    }

    std::shared_ptr<const C2Allocator::Traits> getTraits() const {
        return mTraits;
    }

    c2_status_t newGraphicAllocation(
            uint32_t width, uint32_t height, uint32_t format, const C2MemoryUsage &usage,
            std::shared_ptr<C2GraphicAllocation> *allocation);

    c2_status_t priorGraphicAllocation(
            const C2Handle *handle,
            std::shared_ptr<C2GraphicAllocation> *allocation);

    c2_status_t status() const { return mInit; }

private:
    std::shared_ptr<C2Allocator::Traits> mTraits;
    c2_status_t mInit;
    sp<IAllocator> mAllocator;
    sp<IMapper> mMapper;
    const bool mBufferQueue;
};

void _UnwrapNativeCodec2GrallocMetadata(
        const C2Handle *const handle,
        uint32_t *width, uint32_t *height, uint32_t *format,uint64_t *usage, uint32_t *stride,
        uint32_t *generation, uint64_t *igbp_id, uint32_t *igbp_slot) {
    (void)C2HandleGralloc::Import(handle, width, height, format, usage, stride,
                                  generation, igbp_id, igbp_slot);
}

C2AllocatorGralloc::Impl::Impl(id_t id, bool bufferQueue)
    : mInit(C2_OK), mBufferQueue(bufferQueue) {
    // TODO: get this from allocator
    C2MemoryUsage minUsage = { 0, 0 }, maxUsage = { ~(uint64_t)0, ~(uint64_t)0 };
    Traits traits = { "android.allocator.gralloc", id, C2Allocator::GRAPHIC, minUsage, maxUsage };
    mTraits = std::make_shared<C2Allocator::Traits>(traits);

    // gralloc allocator is a singleton, so all objects share a global service
    mAllocator = IAllocator::getService();
    mMapper = IMapper::getService();
    if (mAllocator == nullptr || mMapper == nullptr) {
        mInit = C2_CORRUPTED;
    }
}

c2_status_t C2AllocatorGralloc::Impl::newGraphicAllocation(
        uint32_t width, uint32_t height, uint32_t format, const C2MemoryUsage &usage,
        std::shared_ptr<C2GraphicAllocation> *allocation) {
    uint64_t grallocUsage = static_cast<C2AndroidMemoryUsage>(usage).asGrallocUsage();
    ALOGV("allocating buffer with usage %#llx => %#llx",
          (long long)usage.expected, (long long)grallocUsage);

    BufferDescriptorInfo info = {
        {
            width,
            height,
            1u,  // layerCount
            (PixelFormat)format,
            grallocUsage,
        },
        0u,  // stride placeholder
    };
    c2_status_t err = C2_OK;
    BufferDescriptor desc;
    mMapper->createDescriptor(
            info.mapperInfo, [&err, &desc](const auto &maperr, const auto &descriptor) {
                err = maperr2error(maperr);
                if (err == C2_OK) {
                    desc = descriptor;
                }
            });
    if (err != C2_OK) {
        return err;
    }

    // IAllocator shares IMapper error codes.
    hidl_handle buffer;
    mAllocator->allocate(
            desc,
            1u,
            [&err, &buffer, &info](const auto &maperr, const auto &stride, auto &buffers) {
                err = maperr2error(maperr);
                if (err != C2_OK) {
                    return;
                }
                if (buffers.size() != 1u) {
                    err = C2_CORRUPTED;
                    return;
                }
                info.stride = stride;
                buffer = std::move(buffers[0]);
            });
    if (err != C2_OK) {
        return err;
    }


    allocation->reset(new C2AllocationGralloc(
            info, mMapper, buffer,
            C2HandleGralloc::WrapNativeHandle(
                    buffer.getNativeHandle(),
                    info.mapperInfo.width, info.mapperInfo.height,
                    (uint32_t)info.mapperInfo.format, info.mapperInfo.usage, info.stride,
                    0, 0, mBufferQueue ? ~0 : 0),
            mTraits->id));
    return C2_OK;
}

c2_status_t C2AllocatorGralloc::Impl::priorGraphicAllocation(
        const C2Handle *handle,
        std::shared_ptr<C2GraphicAllocation> *allocation) {
    BufferDescriptorInfo info;
    info.mapperInfo.layerCount = 1u;
    uint32_t generation;
    uint64_t igbp_id;
    uint32_t igbp_slot;
    const C2HandleGralloc *grallocHandle = C2HandleGralloc::Import(
            handle,
            &info.mapperInfo.width, &info.mapperInfo.height,
            (uint32_t *)&info.mapperInfo.format, (uint64_t *)&info.mapperInfo.usage, &info.stride,
            &generation, &igbp_id, &igbp_slot);
    if (grallocHandle == nullptr) {
        return C2_BAD_VALUE;
    }

    hidl_handle hidlHandle;
    hidlHandle.setTo(C2HandleGralloc::UnwrapNativeHandle(grallocHandle), true);

    allocation->reset(new C2AllocationGralloc(info, mMapper, hidlHandle, grallocHandle, mTraits->id));
    return C2_OK;
}

C2AllocatorGralloc::C2AllocatorGralloc(id_t id, bool bufferQueue)
        : mImpl(new Impl(id, bufferQueue)) {}

C2AllocatorGralloc::~C2AllocatorGralloc() { delete mImpl; }

C2Allocator::id_t C2AllocatorGralloc::getId() const {
    return mImpl->getId();
}

C2String C2AllocatorGralloc::getName() const {
    return mImpl->getName();
}

std::shared_ptr<const C2Allocator::Traits> C2AllocatorGralloc::getTraits() const {
    return mImpl->getTraits();
}

c2_status_t C2AllocatorGralloc::newGraphicAllocation(
        uint32_t width, uint32_t height, uint32_t format, C2MemoryUsage usage,
        std::shared_ptr<C2GraphicAllocation> *allocation) {
    return mImpl->newGraphicAllocation(width, height, format, usage, allocation);
}

c2_status_t C2AllocatorGralloc::priorGraphicAllocation(
        const C2Handle *handle,
        std::shared_ptr<C2GraphicAllocation> *allocation) {
    return mImpl->priorGraphicAllocation(handle, allocation);
}

c2_status_t C2AllocatorGralloc::status() const {
    return mImpl->status();
}

bool C2AllocatorGralloc::isValid(const C2Handle* const o) {
    return C2HandleGralloc::isValid(o);
}

} // namespace android