/*
 * Copyright (C) 2007 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_TAG "GraphicBufferMapper"
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
//#define LOG_NDEBUG 0

#include <ui/GraphicBufferMapper.h>

#include <grallocusage/GrallocUsageConversion.h>

// We would eliminate the non-conforming zero-length array, but we can't since
// this is effectively included from the Linux kernel
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wzero-length-array"
#include <sync/sync.h>
#pragma clang diagnostic pop

#include <utils/Log.h>
#include <utils/Trace.h>

#include <ui/Gralloc2.h>
#include <ui/GraphicBuffer.h>

#include <system/graphics.h>

namespace android {
// ---------------------------------------------------------------------------

ANDROID_SINGLETON_STATIC_INSTANCE( GraphicBufferMapper )

void GraphicBufferMapper::preloadHal() {
    Gralloc2::Mapper::preload();
}

GraphicBufferMapper::GraphicBufferMapper()
  : mMapper(std::make_unique<const Gralloc2::Mapper>())
{
}

status_t GraphicBufferMapper::importBuffer(buffer_handle_t rawHandle,
        buffer_handle_t* outHandle)
{
    ATRACE_CALL();

    Gralloc2::Error error = mMapper->importBuffer(
            hardware::hidl_handle(rawHandle), outHandle);

    ALOGW_IF(error != Gralloc2::Error::NONE, "importBuffer(%p) failed: %d",
            rawHandle, error);

    return static_cast<status_t>(error);
}

status_t GraphicBufferMapper::freeBuffer(buffer_handle_t handle)
{
    ATRACE_CALL();

    mMapper->freeBuffer(handle);

    return NO_ERROR;
}

static inline Gralloc2::IMapper::Rect asGralloc2Rect(const Rect& rect) {
    Gralloc2::IMapper::Rect outRect{};
    outRect.left = rect.left;
    outRect.top = rect.top;
    outRect.width = rect.width();
    outRect.height = rect.height();
    return outRect;
}

status_t GraphicBufferMapper::lock(buffer_handle_t handle, uint32_t usage,
        const Rect& bounds, void** vaddr)
{
    return lockAsync(handle, usage, bounds, vaddr, -1);
}

status_t GraphicBufferMapper::lockYCbCr(buffer_handle_t handle, uint32_t usage,
        const Rect& bounds, android_ycbcr *ycbcr)
{
    return lockAsyncYCbCr(handle, usage, bounds, ycbcr, -1);
}

status_t GraphicBufferMapper::unlock(buffer_handle_t handle)
{
    int32_t fenceFd = -1;
    status_t error = unlockAsync(handle, &fenceFd);
    if (error == NO_ERROR) {
        sync_wait(fenceFd, -1);
        close(fenceFd);
    }
    return error;
}

status_t GraphicBufferMapper::lockAsync(buffer_handle_t handle,
        uint32_t usage, const Rect& bounds, void** vaddr, int fenceFd)
{
    return lockAsync(handle, usage, usage, bounds, vaddr, fenceFd);
}

status_t GraphicBufferMapper::lockAsync(buffer_handle_t handle,
        uint64_t producerUsage, uint64_t consumerUsage, const Rect& bounds,
        void** vaddr, int fenceFd)
{
    ATRACE_CALL();

    const uint64_t usage = static_cast<uint64_t>(
            android_convertGralloc1To0Usage(producerUsage, consumerUsage));
    Gralloc2::Error error = mMapper->lock(handle, usage,
            asGralloc2Rect(bounds), fenceFd, vaddr);

    ALOGW_IF(error != Gralloc2::Error::NONE, "lock(%p, ...) failed: %d",
            handle, error);

    return static_cast<status_t>(error);
}

static inline bool isValidYCbCrPlane(const android_flex_plane_t& plane) {
    if (plane.bits_per_component != 8) {
        ALOGV("Invalid number of bits per component: %d",
                plane.bits_per_component);
        return false;
    }
    if (plane.bits_used != 8) {
        ALOGV("Invalid number of bits used: %d", plane.bits_used);
        return false;
    }

    bool hasValidIncrement = plane.h_increment == 1 ||
            (plane.component != FLEX_COMPONENT_Y && plane.h_increment == 2);
    hasValidIncrement = hasValidIncrement && plane.v_increment > 0;
    if (!hasValidIncrement) {
        ALOGV("Invalid increment: h %d v %d", plane.h_increment,
                plane.v_increment);
        return false;
    }

    return true;
}

status_t GraphicBufferMapper::lockAsyncYCbCr(buffer_handle_t handle,
        uint32_t usage, const Rect& bounds, android_ycbcr *ycbcr, int fenceFd)
{
    ATRACE_CALL();

    Gralloc2::YCbCrLayout layout;
    Gralloc2::Error error = mMapper->lock(handle, usage,
            asGralloc2Rect(bounds), fenceFd, &layout);
    if (error == Gralloc2::Error::NONE) {
        ycbcr->y = layout.y;
        ycbcr->cb = layout.cb;
        ycbcr->cr = layout.cr;
        ycbcr->ystride = static_cast<size_t>(layout.yStride);
        ycbcr->cstride = static_cast<size_t>(layout.cStride);
        ycbcr->chroma_step = static_cast<size_t>(layout.chromaStep);
    }

    return static_cast<status_t>(error);
}

status_t GraphicBufferMapper::unlockAsync(buffer_handle_t handle, int *fenceFd)
{
    ATRACE_CALL();

    *fenceFd = mMapper->unlock(handle);

    return NO_ERROR;
}

// ---------------------------------------------------------------------------
}; // namespace android
