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#include "test_precomp.hpp"

namespace opencv_test { namespace {

typedef testing::TestWithParam<tuple<Size, int, int> > Video_Acc_Cn4;

TEST_P(Video_Acc_Cn4, accuracy)
{
    const Size size = get<0>(GetParam());
    const int pattern = get<1>(GetParam());
    const int srcType = get<2>(GetParam());

    RNG& rng = theRNG();

    Mat src(size, srcType);
    Mat dst(size, CV_32FC4);
    Mat mask(size, CV_8UC1);

    if (srcType == CV_8UC4)
        rng.fill(src, RNG::UNIFORM, Scalar::all(0), Scalar::all(256));
    else
        rng.fill(src, RNG::UNIFORM, Scalar::all(-10.0), Scalar::all(10.0));

    rng.fill(dst, RNG::UNIFORM, Scalar::all(-1000.0), Scalar::all(1000.0));

    for (int y = 0; y < mask.rows; ++y)
    {
        uchar* row = mask.ptr<uchar>(y);

        for (int x = 0; x < mask.cols; ++x)
        {
            switch (pattern)
            {
            case 0:
                row[x] = 0;
                break;
            case 1:
                row[x] = 255;
                break;
            case 2:
                row[x] = ((x + y) % 2) ? 255 : 0;
                break;
            case 3:
                row[x] = ((x * 13 + y * 7) % 5) ? 255 : 0;
                break;
            default:
                row[x] = ((x * 17 + y * 11) % 3) ? 255 : 0;
                break;
            }
        }
    }

    Mat dstRef = dst.clone();

    if (srcType == CV_32FC4)
    {
        for (int y = 0; y < src.rows; ++y)
        {
            const Vec4f* srcRow = src.ptr<Vec4f>(y);
            Vec4f* dstRefRow = dstRef.ptr<Vec4f>(y);
            const uchar* maskRow = mask.ptr<uchar>(y);

            for (int x = 0; x < src.cols; ++x)
            {
                if (maskRow[x])
                {
                    for (int c = 0; c < 4; ++c)
                        dstRefRow[x][c] += srcRow[x][c];
                }
            }
        }
    }
    else
    {
        CV_Assert(srcType == CV_8UC4);

        for (int y = 0; y < src.rows; ++y)
        {
            const Vec4b* srcRow = src.ptr<Vec4b>(y);
            Vec4f* dstRefRow = dstRef.ptr<Vec4f>(y);
            const uchar* maskRow = mask.ptr<uchar>(y);

            for (int x = 0; x < src.cols; ++x)
            {
                if (maskRow[x])
                {
                    for (int c = 0; c < 4; ++c)
                        dstRefRow[x][c] += static_cast<float>(srcRow[x][c]);
                }
            }
        }
    }

    cv::accumulate(src, dst, mask);

    const double err = cv::norm(dst, dstRef, NORM_INF);

    EXPECT_EQ(0.0, err)
        << "size=" << size
        << ", pattern=" << pattern
        << ", srcType=" << srcType;
}

INSTANTIATE_TEST_CASE_P(Accumulate,
    Video_Acc_Cn4,
    testing::Combine(
        testing::Values(Size(1, 1),
                        Size(3, 5),
                        Size(17, 7),
                        Size(37, 19),
                        Size(128, 16),
                        Size(641, 37)),
        testing::Values(0, 1, 2, 3, 4),
        testing::Values(CV_32FC4, CV_8UC4)));

}} // namespace