here is my attempt but i have no idea how to define a function as a pointer and ive tried alot of variations but is too long to post. The defun change contrast compiles btw...i tried using make-pointer to make the change-contrast function a pointer but make-pointer wants it to be a real...so cant use foreign-alloc i dont think because the function needs to be converted to a pointer first to use that...any guidance is appreciated
(defun change-contrast (&optional contrast img dest) (if (< contrast 10) (scale img dest (/ 1 (coerce (- 11 contrast) 'double-float))) (if (>= contrast 10) (scale img dest (- contrast 9)))) (show-image "MyImage" dest))
(defun display (filename) "Open the image FILENAME and show it in a window." (let* ((img (load-image filename 1)) (img-size (get-size img)) (dest (create-image img-size +ipl-depth-8u+ 3)) (contrast (cffi:foreign-alloc :int :initial-contents '(10)) (test "not sure what to do here"))) (named-window "MyWindow" 1) (create-trackbar "conrast" "MyWindow" contrast 21 test) (princ (mem-ref contrast :int)) (change-contrast (mem-ref contrast :int) img dest) (loop while (not (= (wait-key 0) 27))) (release-image img) (release-image dest) (destroy-window "MyWindow")))
Have you read defcallback documentation? If no, read it and try to use defcallback. If yes, what was your problem when using defcallback?