From what I understood of the link there is the "grapheme" which is an intermediary representation between being UTF-8 and being drawn on the screen. Like all p

From what I understood of the link there is the "grapheme" which is an intermediary representation between being UTF-8 and being drawn on the screen. Like all possible glyphs have been prerendered. It's not got some simple graphics engine to draw those on the fly. Couldn't you directly provide an index in the grapheme "cache" ?