[racket] racket/gui: Problem displaying bitmap data

Dear list,
 
I am trying to display bitmap data that I have written into a SRFI-4 u8vector (that  I believe maps to a Racket
bytevector). The bitmap data is in RGBA format. Now I am trying to display the bitmap data in a window.
Please see the relevant part of my program below:

  (define (main)
    (let* ((the-toplevel-frame (new frame% (label "Raycaster 3D!")))
           (the-canvas (new canvas% (parent the-toplevel-frame)))
           (the-canvas-bitmap (send the-canvas make-bitmap
                                    (game-screen-width *the-screen*)
                                    (game-screen-height *the-screen*)))
           (the-canvas-bitmap-dc (new bitmap-dc% (bitmap the-canvas-bitmap))))
      (for-each (lambda (e) (apply vline e)) (raycast-all *game-map*)) ;; Application logic :)
      (send the-canvas-bitmap-dc set-argb-pixels 0 0
                                (game-screen-width *the-screen*)
                                (game-screen-height *the-screen*)
                                (game-screen-data *the-screen*)
                                #f #f)
      (send the-toplevel-frame show #t)))

However this results in the error message:

$ racket -t game6.rkt

[Debug output of program snipped] ...

set-argb-pixels in bitmap%: not available in a canvas-compatible bitmap: (object:x11-bitmap% ...)
  context...:
   /usr/local/share/racket/pkgs/draw-lib/racket/draw/private/bitmap.rkt:776:4: core404
   /home/alexshendi/sources/racket/game/game6.rkt:366:2: main 
   /home/alexshendi/sources/racket/game/game6.rkt: [running body]


Operating System: Linux x86_64 (Ubuntu 14.04)
Racket Version: 6.0.1 (Release)

Can anyone help me do it the correct way? Many thanks in advance.

Best Regards,

Alexander
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