[StructLayout(LayoutKind.Explicit)]
    public struct ParamData
    {
      [FieldOffset(0)]
      public Int32	d_int32;
      [FieldOffset(0)]
      public Int16	d_int16;
      [FieldOffset(0)]
      public byte	d_int8;
      [FieldOffset(0)]
      public double 	d_float;
      [FieldOffset(0)]
      public IntPtr	d_string;
      [FieldOffset(0)]
      public GimpRGB  	d_color;
#if _FIXME_
      [FieldOffset(0)]
      public ParamRegion d_region;
#endif
      [FieldOffset(0)]
      public Int32    	d_image;
      [FieldOffset(0)]
      public Int32    	d_drawable;
#if _FIXME_
      [FieldOffset(0)]
      GimpParasite    	d_parasite;
#endif
      [FieldOffset(0)]
      public PDBStatusType	d_status;
    };