Function TEST

test/gray_rgb.cpp:104–130

}

TEST(rgb_gray, MaxDim) {
    size_t largeDim = 65535 * 32 + 1;
    array rgb       = randu(1, largeDim, 3, u8);
    array gray      = rgb2gray(rgb);

    vector<uchar> h_rgb(rgb.elements());
    vector<float> h_gray(gray.elements());

    rgb.host(&h_rgb[0]);
    gray.host(&h_gray[0]);

    int num  = gray.elements();
    int roff = 0;
    int goff = num;
    int boff = 2 * num;

    const float rPercent = 0.2126f;
    const float gPercent = 0.7152f;
    const float bPercent = 0.0722f;

    for (int i = 0; i < num; i++) {
        float res = rPercent * h_rgb[i + roff] + gPercent * h_rgb[i + goff] +
                    bPercent * h_rgb[i + boff];

        ASSERT_FLOAT_EQ(res, h_gray[i]);
    }
}