[ft-devel] A CFF in an SFNT can have only a single font

[mpsuzuki]

Hi,

When I read CFF driver (to synchronize the support of
sfnt-wrapped Type1 and CID-keyed font), I found a comment
in cffobjs.c.

      /* UNDOCUMENTED!  A CFF in an SFNT can have only a single font. */
      if ( face_index > 0 )
      {
        FT_ERROR(( "cff_face_init: invalid face index\n" ));
        error = CFF_Err_Invalid_Argument;
        goto Exit;
      }

It makes me reminds a note in OpenType specification:

        "The CFF rasterizer does not currently support TTC files."
        (http://www.microsoft.com/typography/otspec/otff.htm)

Is this note sufficient reason to restrict face_index = 0?
If so, I want to revise the comment.

Regards,
mpsuzuki