@retrimental @scaroo @ebassi My understanding from quickly reading
https://harfbuzz.github.io/what-is-harfbuzz.html, is that it takes a Unicode string and font, figures out which drawing (glyph) to take from the font, and in which order, and returns that sequence. It basically takes "48 45 4C 4C 4F" and replies "take an H, then an E, then an L ... and that's how you draw HELLO".