Reference Manual - 1.4.3
IDirectFBWindow   SetColor

Set the window color, or colorises the window.

DFBResult SetColor (
  IDirectFBWindow   * thiz,
  u8   r,
  u8   g,
  u8   b,
  u8   a
);

In case you specified DWCAPS_COLOR, this sets the window draw color. In case you didn't, it colorises the window with this color; this will darken the window. no DWCAPS_COLOR and an opacity of 0 means: no effect.

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