|Microsoft DirectX 9.0|
The AddOverlayDirtyRect method is used to build up the list of the rectangles that need to be updated the next time the UpdateOverlayDisplay method is called. This method is used for the software implementation. It is not needed if the overlay support is provided in hardware.
HRESULT AddOverlayDirtyRect( LPRECT lpRect );
Points to the RECT structure that needs to be updated.
|DD_OK||The method succeeded.|
|DDERR_INVALIDPARAMS||One or more of the input parameters is invalid.|
|DDERR_INVALIDOBJECT||DirectDraw received a pointer that was an invalid DirectDraw object.|
|DDERR_UNSUPPORTED||Action not supported.|