Ok, well from what I have seen so far, is that TPowerFont with UnDelphiX, has the characters in a specific order in the image, and you basically tell it the bounding box (just like with images and the TImageList).

so each character might have a space of 22x22 or some such and then of course they will have a specific row and column set and order the characters go in (so the components knows exactly what is what).