Function cubic

utils/resize_right/interp_methods.py:36–43

(x)

@support_sz(4)
def cubic(x):
    fw, to_dtype, eps = set_framework_dependencies(x)
    absx = fw.abs(x)
    absx2 = absx ** 2
    absx3 = absx ** 3
    return ((1.5 * absx3 - 2.5 * absx2 + 1.) * to_dtype(absx <= 1.) +
            (-0.5 * absx3 + 2.5 * absx2 - 4. * absx + 2.) *
            to_dtype((1. < absx) & (absx <= 2.)))


@support_sz(4)