/*
 * 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.
 */

#include <allocator-passthrough/2.0/Gralloc0Hal.h>

#include <string.h>

#include <GrallocBufferDescriptor.h>
#include <hardware/gralloc.h>
#include <log/log.h>

namespace android {
namespace hardware {
namespace graphics {
namespace allocator {
namespace V2_0 {
namespace passthrough {

using mapper::V2_0::implementation::grallocDecodeBufferDescriptor;

Gralloc0Hal::~Gralloc0Hal() {
    if (mDevice) {
        gralloc_close(mDevice);
    }
}

bool Gralloc0Hal::initWithModule(const hw_module_t* module) {
    int result = gralloc_open(module, &mDevice);
    if (result) {
        ALOGE("failed to open gralloc0 device: %s", strerror(-result));
        mDevice = nullptr;
        return false;
    }

    return true;
}

std::string Gralloc0Hal::dumpDebugInfo() {
    char buf[4096] = {};
    if (mDevice->dump) {
        mDevice->dump(mDevice, buf, sizeof(buf));
        buf[sizeof(buf) - 1] = '\0';
    }

    return buf;
}

Error Gralloc0Hal::allocateBuffers(const BufferDescriptor& descriptor, uint32_t count,
                                   uint32_t* outStride,
                                   std::vector<const native_handle_t*>* outBuffers) {
    mapper::V2_0::IMapper::BufferDescriptorInfo descriptorInfo;
    if (!grallocDecodeBufferDescriptor(descriptor, &descriptorInfo)) {
        return Error::BAD_DESCRIPTOR;
    }

    Error error = Error::NONE;
    uint32_t stride = 0;
    std::vector<const native_handle_t*> buffers;
    buffers.reserve(count);

    // allocate the buffers
    for (uint32_t i = 0; i < count; i++) {
        const native_handle_t* tmpBuffer;
        uint32_t tmpStride;
        error = allocateOneBuffer(descriptorInfo, &tmpBuffer, &tmpStride);
        if (error != Error::NONE) {
            break;
        }

        buffers.push_back(tmpBuffer);

        if (stride == 0) {
            stride = tmpStride;
        } else if (stride != tmpStride) {
            // non-uniform strides
            error = Error::UNSUPPORTED;
            break;
        }
    }

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

    *outStride = stride;
    *outBuffers = std::move(buffers);

    return Error::NONE;
}

void Gralloc0Hal::freeBuffers(const std::vector<const native_handle_t*>& buffers) {
    for (auto buffer : buffers) {
        int result = mDevice->free(mDevice, buffer);
        if (result != 0) {
            ALOGE("failed to free buffer %p: %d", buffer, result);
        }
    }
}

Error Gralloc0Hal::allocateOneBuffer(const mapper::V2_0::IMapper::BufferDescriptorInfo& info,
                                     const native_handle_t** outBuffer, uint32_t* outStride) {
    if (info.layerCount > 1 || (info.usage >> 32) != 0) {
        return Error::BAD_VALUE;
    }

    const native_handle_t* buffer = nullptr;
    int stride = 0;
    int result = mDevice->alloc(mDevice, info.width, info.height, static_cast<int>(info.format),
                                info.usage, &buffer, &stride);
    switch (result) {
        case 0:
            *outBuffer = buffer;
            *outStride = stride;
            return Error::NONE;
        case -EINVAL:
            return Error::BAD_VALUE;
        default:
            return Error::NO_RESOURCES;
    }
}

}  // namespace passthrough
}  // namespace V2_0
}  // namespace allocator
}  // namespace graphics
}  // namespace hardware
}  // namespace android