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Determines if the renderer is using the default source rectangle.
HRESULT IsUsingDefaultSource( );
Return Values
Returns an HRESULTvalue. Returns S_OK if using the default source; otherwise, returns S_FALSE.
Remarks
You can use the IBasicVideo::SetDefaultSourcePositionmethod to inform the filter to use the default settings for the source rectangle. This method returns whether or not the settings are in use.