Fetches alternates of a glyph from a given GSUB lookup index.
Note that for one-to-one GSUB glyph substitutions, this function fetches the substituted glyph.
| face |
a face. |
| lookup_index |
index of the feature lookup to query. |
| glyph |
a glyph id. |
| start_offset |
starting offset. |
| alternate_glyphs |
A glyphs buffer. Alternate glyphs associated with the glyph id. |
| alternate_count |
Input = the maximum number of alternate glyphs to return; Output = the actual number of alternate glyphs returned (may be zero). |
|
Total number of alternates found in the specific lookup index for the given glyph id. |