Function stbi__paeth

lite/example/cpp_example/mge/cv/stb_image.h:5007–5017

        STBI__F_paeth_first};

static int stbi__paeth(int a, int b, int c) {
    int p = a + b - c;
    int pa = abs(p - a);
    int pb = abs(p - b);
    int pc = abs(p - c);
    if (pa <= pb && pa <= pc)
        return a;
    if (pb <= pc)
        return b;
    return c;
}

static const stbi_uc stbi__depth_scale_table[9] = {0, 0xff, 0x55, 0,   0x11,
                                                   0, 0,    0,    0x01};