Reference Manual - 1.8.0
IDirectFBSurface   SetAlphaRamp

Set the alpha ramp for formats with one or two alpha bits.

DFBResult SetAlphaRamp (
  IDirectFBSurface   * thiz,
  u8   a0,
  u8   a1,
  u8   a2,
  u8   a3

Either all four values or the first and the last one are used, depending on the format. Default values are: 0x00, 0x55, 0xaa, 0xff.

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