otLayoutLanguageGetFeatureTags

uint otLayoutLanguageGetFeatureTags(harfbuzz.face.Face face,  harfbuzz.types.Tag tableTag,  uint  scriptIndex,  uint  languageIndex,  uint  startOffset,  ref  harfbuzz.types.Tag[]  featureTags)

Fetches a list of all features in the specified face's GSUB table or GPOS table, underneath the specified script and language. The list returned will begin at the offset provided.

Parameters

`face`	#hb_face_t to work upon
`tableTag`	#HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS
`scriptIndex`	The index of the requested script tag
`languageIndex`	The index of the requested language tag
`startOffset`	offset of the first feature tag to retrieve
`featureTags`	The array of #hb_tag_t feature tags found for the query

Returns

Total number of feature tags.