Function haar_transform_f32 

pub fn haar_transform_f32(data: &mut [f32]) -> Status

In-place, orthogonal Haar Transform for f32: an O(n) multiresolution transform using only additions, subtractions, and a sqrt(0.5) scale factor per stage, with no trigonometric factors at all (unlike the Fourier/Hartley transforms).

data.len() must be a power of 2 (e.g. 2, 4, 8, …, 1024).