Reference Manual - 0.9.25
IDirectFBSurface   SetSrcColorKey

Set the source color key, i.e. the color that is excluded when blitting FROM this surface TO another that has source color keying enabled.

SetSrcColorKey (
  IDirectFBSurface   * thiz,
  __u8   r,
  __u8   g,
  __u8   b
);