Reference Manual - 1.0.1
IDirectFBWindow   SetOpaqueRegion

Disable alpha channel blending for one region of the window.

SetOpaqueRegion (
  IDirectFBWindow   * thiz,
  int   x1,
  int   y1,
  int   x2,
  int   y2

If DWOP_ALPHACHANNEL and DWOP_OPAQUE_REGION are set but not DWOP_COLORKEYING and the opacity of the window is 255 the window gets rendered without alpha blending within the specified region.

This is extremely useful for alpha blended window decorations while the main content stays opaque and gets rendered faster.

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