otLayoutFeatureGetCharacters

uint otLayoutFeatureGetCharacters(harfbuzz.face.Face face,  harfbuzz.types.Tag tableTag,  uint  featureIndex,  uint  startOffset,  ref  harfbuzz.types.Codepoint[]  characters)

Fetches a list of the characters defined as having a variant under the specified "Character Variant" ("cvXX") feature tag.

Parameters

`face`	#hb_face_t to work upon
`tableTag`	table tag to query, "GSUB" or "GPOS".
`featureIndex`	index of feature to query.
`startOffset`	offset of the first character to retrieve
`characters`	A buffer pointer. The Unicode codepoints of the characters for which this feature provides glyph variants.

Returns

Number of total sample characters in the cvXX feature.