Calculates "panse index" (panoseIndex) and count of chars that can be displayed by fss. panoseIndex represents difference between current FontSubSetBase object and fss object. Minimal number defines minimal difference, i.e. 0 means that current FontSubSetBase object and fss very similar. -1 means that fss can not be used as alternative for current object to display s.

'宣言
 
Public Sub GetFontDifference( _
   ByVal text As String, _
   ByVal fss As FontSubSet, _
   ByRef panoseIndex As Integer, _
   ByRef supportedGlyphCount As Integer _
) 

public void GetFontDifference( 
   string text,
   FontSubSet fss,
   out int panoseIndex,
   out int supportedGlyphCount
)