Converts a HarfBuzz.feature_t into a NULL-terminated string in the format
understood by hb_feature_from_string(). The client in responsible for
allocating big enough size for buf, 128 bytes is more than enough.
Note that the feature value will be omitted if it is '1', but the
string won't include any whitespace.
Converts a HarfBuzz.feature_t into a
NULL-terminated string in the format understood byhb_feature_from_string(). The client in responsible for allocating big enough size forbuf, 128 bytes is more than enough.Note that the feature value will be omitted if it is '1', but the string won't include any whitespace.