|Microsoft DirectX 9.0|
The GetOverlayFX method retrieves the effects currently applied to the overlay surface, if any. The application can call this method while the filter graph is running.
HRESULT GetOverlayFX( DWORD *lpdwOverlayFX );
[out] Pointer a variable that receives a value indicating which effects, if any, are currently applied to the overlay surface. The value is a logical combination of flags from the AMOVERLAYFX enumeration.
Returns an HRESULT value that depends on the implementation of the interface. The DirectShow implementation returns S_OK if successful, or E_POINTER to indicate a NULL pointer argument.