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#include "test_precomp.hpp"

#ifdef HAVE_CUDA

#include "opencv2/cudaarithm.hpp"
#include "opencv2/cudawarping.hpp"
#include "opencv2/core/private.cuda.hpp"

using namespace testing;
using namespace cv;
using namespace cv::cuda;

struct BufferPoolTest : TestWithParam<DeviceInfo>
{
};

namespace
{
    void func1(const GpuMat& src, GpuMat& dst, Stream& stream)
    {
        BufferPool pool(stream);

        GpuMat buf = pool.getBuffer(src.size(), CV_32FC(src.channels()));

        src.convertTo(buf, CV_32F, 1.0 / 255.0, stream);

        cuda::exp(buf, dst, stream);
    }

    void func2(const GpuMat& src, GpuMat& dst, Stream& stream)
    {
        BufferPool pool(stream);

        GpuMat buf1 = pool.getBuffer(saturate_cast<int>(src.rows * 0.5), saturate_cast<int>(src.cols * 0.5), src.type());

        cuda::resize(src, buf1, Size(), 0.5, 0.5, cv::INTER_NEAREST, stream);

        GpuMat buf2 = pool.getBuffer(buf1.size(), CV_32FC(buf1.channels()));

        func1(buf1, buf2, stream);

        GpuMat buf3 = pool.getBuffer(src.size(), buf2.type());

        cuda::resize(buf2, buf3, src.size(), 0, 0, cv::INTER_NEAREST, stream);

        buf3.convertTo(dst, CV_8U, stream);
    }
}

CUDA_TEST_P(BufferPoolTest, SimpleUsage)
{
    DeviceInfo devInfo = GetParam();
    setDevice(devInfo.deviceID());

    GpuMat src(200, 200, CV_8UC1);
    GpuMat dst;

    Stream stream;

    func2(src, dst, stream);

    stream.waitForCompletion();

    GpuMat buf, buf1, buf2, buf3;
    GpuMat dst_gold;

    cuda::resize(src, buf1, Size(), 0.5, 0.5, cv::INTER_NEAREST);
    buf1.convertTo(buf, CV_32F, 1.0 / 255.0);
    cuda::exp(buf, buf2);
    cuda::resize(buf2, buf3, src.size(), 0, 0, cv::INTER_NEAREST);
    buf3.convertTo(dst_gold, CV_8U);

    ASSERT_MAT_NEAR(dst_gold, dst, 0);
}

INSTANTIATE_TEST_CASE_P(CUDA_Stream, BufferPoolTest, ALL_DEVICES);

#endif // HAVE_CUDA