Function cdef_dist_wxh

pub fn cdef_dist_wxh<T: Pixel, F: Fn(Area, BlockSize) -> DistortionScale>(
    src1: &PlaneRegion<'_, T>,
    src2: &PlaneRegion<'_, T>,
    w: usize,
    h: usize,
    bit_depth: usize,
    compute_bias: F,
    cpu: CpuFeatureLevel,
) -> Distortion