Function soft_light_serial 

pub fn soft_light_serial(
    a: ArrayView2<'_, f32>,
    b: ArrayView2<'_, f32>,
    out: &mut Array2<f32>,
)

Soft light blend of two 2-D arrays, single-threaded.

Same arguments, output and panics as soft_light_core, but always runs serially regardless of size. Public for benchmarking only (see module docs).