|Microsoft DirectX 9.0|
The SetRedrawAlways method specifies whether the Line 21 Decoder filter redraws the entire output bitmap for each sample.
HRESULT SetRedrawAlways( BOOL bOption );
Specifies one of the following values.
|TRUE||The filter always redraws the entire bitmap.|
|FALSE||The filter does not always redraw the entire bitmap. (Default)|
Returns S_OK if successful, or an error code otherwise.
Generally, applications should not call this method. The downstream mixer or renderer filter should call this method with the value TRUE if it writes into the buffers that it receives from the Line 21 Decoder filter. Redrawing degrades performance and increases CPU load, because it negates any potential optimizations.