Struct FftPlans 

pub struct FftPlans<T: FftNum = f32> { /* private fields */ }

Cached FFT plans for a fixed (nrows, ncols) image size.

rustfft/realfft plans are Arc<dyn …> and Send + Sync, so a single FftPlans can be built once per cube and shared by reference across the rayon workers that convolve channels in parallel — each call brings its own scratch, so only the (immutable) plans are shared. Building plans is the expensive part of a transform; reusing them avoids re-planning on every channel.

Implementations

impl<T: FftNum> FftPlans<T>

pub fn new(nrows: usize, ncols: usize) -> Self

Plan the forward/inverse real (row) and complex (column) FFTs for an nrows × ncols image. Reuse this across all channels of a cube.

pub fn dim(&self) -> (usize, usize)

Image dimensions (nrows, ncols) these plans were built for.