find-or-create-font-id

Gets the font face name for a font id, initializing the mapping for the face name if necessary.

• (send a-font-name-directory find-or-create-font-id name family) -> exact integer
      name : string
      family : symbol in '(default decorative roman script swiss modern system)

  If the mapping for name has not yet been created, it is created with initialize using family as the default font family.