Re: Pango Unicode coverage

[Eric Mader <mader jtcsv com>]

For information about the four byte 'cmap' formats (8, 10, 12) see:

http://www.microsoft.com/typography/otspec/cmap.htm

- or -

http://developer.apple.com/fonts/TTRefMan/RM06/Chap6cmap.html

Eric Mader

At 10:09 AM 12/27/2001, Owen Taylor wrote:

> Roozbeh Pournader <roozbeh sharif edu> writes:
>
> > On 26 Dec 2001, Owen Taylor wrote:
> >
> > >  * The unicode character property code in Glib needs some
> > >    work to handle properties for characters not in the
> > >    BMP. (The interfaces are fine, but the internal data
> > >    structures are limited.)
> >
> > We recently redid FriBidi's informational data structures to support
> > non-BMP characters. Do you think it will be hard to do for Glib? If not, I
> > can put some time on it (mainly for demonstration purposes, since I love
> > to refer people to pango).
>
> My guess is that it would probably be no more than a days work.
> In fact it could probably be done in half an hour, but the
> challenge is doing it without bloating the size of GLib too much.
>
> (Does it make sense to go from 2 level page tables to 3 level
> page table? Would it be better to special case the plane 14
> language tags in the code to keep things compact? That
> kind of question.)
>
> > >    (Can the TTF format handle Unicode charmaps with characters 
> outside the
> > >    BMP? I don't think so...)
> >
> > I've heard that it does, but did not get into the details. As far as I
> > know, there is a CJK font in WinXP that does this. (There is only a limit
> > of 65536 glyphs per TrueType font, which should not be a problem.)
>
> OK, that sounds good.
>
>                                         Owen
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