| Reference Manual - 1.4.13
IDirectFBWindow | SetOpaqueRegion

#### Disable alpha channel blending for one region of the window.

DFBResult 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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