Re: [emacs-bidi] Hebrew characters categories

[Yair Friedman (Jerusalem)]

TAKAHASHI Naoto <address@hidden> writes:

> "Yair Friedman (Jerusalem)" writes:


>
>> Do you have assumptions about the font structure?
>
> Yes.  If
>
>   1. the font used by our Emacs has the property
>      "_MULE_RELATIVE_COMPOSE" and its value is A
>
> and
>
>   2. a glyph has a descent value B, where B < 0 and -B > A
>
> then such a glyph is put _above_ the preceding character when
> composed.  In case of Arabic, FATHA is such a glyph.
>
> We also added extra white pixels above the BAH, TAH and other glyphs
> so that we can get appropriate distance between the base glyphs and
> FATHA.

So you assume that for composition you *must* have a font with
"_MULE_RELATIVE_COMPOSE" property?