Method screen

src/fl/fx/2d/animartrix_detail/engine.h:114–114

    float multiply(float &x, float &y) { return fl::multiply(x, y); }
    float add(float &x, float &y) { return fl::add(x, y); }
    float screen(float &x, float &y) { return fl::screen(x, y); }
    float colordodge(float &x, float &y) { return fl::colordodge(x, y); }
    float colorburn(float &x, float &y) { return fl::colorburn(x, y); }