Function allsorts::gsub::gsub_apply_lookup

pub fn gsub_apply_lookup<T: GlyphData>(
    gsub_cache: &LayoutCache<GSUB>, 
    gsub_table: &LayoutTable<GSUB>, 
    opt_gdef_table: Option<&GDEFTable>, 
    lookup_index: usize, 
    feature_tag: u32, 
    opt_alternate: Option<usize>, 
    glyphs: &mut Vec<RawGlyph<T>>, 
    start: usize, 
    length: usize, 
    pred: impl Fn(&RawGlyph<T>) -> bool
) -> Result<usize, ParseError>