[Xcb] defining the color

[strinter]

Dear members of the XCB mailing list!

I've got a question related to the definition and usage of colors. What
I want to do is to try to fill the circle with gray colour. I do the following

...

  c = xcb_connect (NULL,NULL);
  screen = xcb_setup_roots_iterator(xcb_get_setup (c)).data;
  win = screen->root;
  cmap = xcb_generate_id (c);
  xcb_create_colormap (c, XCB_COLORMAP_ALLOC_NONE, cmap, win,
screen->root_visual);

  rep = xcb_alloc_color_reply (c, xcb_alloc_color (c, cmap, 128, 128,
128), NULL);

  if (!rep)
    return 0;

  foreground = xcb_generate_id (c);
  mask = XCB_GC_FOREGROUND|XCB_GC_GRAPHICS_EXPOSURES;
  //  values[0]=screen->black_pixel;
  values[0]=rep;
  values[1]=0;
  xcb_create_gc(c,foreground,win,mask,values);

....
  (from a separate function call)

  xcb_arc_t arc[2];
  arc[0].x=x-r;
  arc[0].y=y-r;
  arc[0].width=2*r;
  arc[0].height=2*r;
  arc[0].angle1=0<<6;
  arc[0].angle2=360<<6;
  xcb_poly_fill_arc(c,win,foreground,1,arc);


but eventually end up with the green color not responding to the
values of RGB parameters. Does anybody know what may be the source
of the problem?

Thanks.