Return the output format in the list of registered output formats
which best matches the provided parameters, or return NULL if
there is no match.
@param short_name if non-NULL checks if short_name matches with the
names of the registered formats
@param filename if non-NULL checks if filename terminates with the
extensions of the registered formats
@param mime_type if non-NULL checks if mime_type matches with the
MIME type of the registered formats
Return the output format in the list of registered output formats which best matches the provided parameters, or return NULL if there is no match.
@param short_name if non-NULL checks if short_name matches with the names of the registered formats @param filename if non-NULL checks if filename terminates with the extensions of the registered formats @param mime_type if non-NULL checks if mime_type matches with the MIME type of the registered formats