I am trying to write OpenCV FFI in Racket and arrived at a point where arrays need to be manipulated efficiently. However, all my attempts to access arrays by using Racket FFI resulted in very inefficient code. Is there a way for fast access of C arrays using FFI?
In Racket, this type of manipulation is reasonably fast, i.e.:
(define a-vector (make-vector (* 640 480 3)))
(time (let loop ([i (- (* 640 480 3) 1)])
(when (>= i 0) …