Re: [Paps-discuss] Combining characters not rendered properly

[Dov G. <dov...@gm...>]

Whether combined precomposed characters exist is not the only
indication of whether the font is "correct". A OpenType may describe
combinations either through  GSUB table that indicate what character
combinations should be rendered by one or more other glyphs, or
through a GPOS table that declare the relative offset of the
characters relative to one another. But of course we expect the
various layout engines (Qt, Gtk/Pango, and the IBM engine used in
Mozilla and OpenType if I'm not mistaken) to treat and render the
fonts the same way...

Regards,
Dov


On 12/7/06, Jan Willem Stumpel <jst...@pl...> wrote:
> Thomas Wolff schreef:
> > Hello, for the record (and maybe in support of a pango bug report),
> > I'd like to share my further observations about misplaced combining
> > characters with various fonts:
>
> > I can confirm that it depends on the fonts and here are some
> > test results, not quite the same you had, also exposing additional
> > strange effects: [..]
>
> This is exceedingly weird. Especially the accents being displayed
> *before* the base letter. I am now investigating this more
> systematically (haven't finished, will let the list know as soon
> as possible), but I haven't found a clear pattern yet. In
> particular, there does not seem to be a clear correlation between
> "treating combining accents correctly" and "having the combining
> accents included in the font" as shown by Fontforge. Also, while
> some fonts behave OK and others do not in pango-using programs, in
> non-pango using programs like Openoffice (?) some fonts also
> behave OK and others do not, but they are not the same fonts.
>
> This begins to look like one of these logic puzzles of the type
> "in one street live an Englishman, a German, a Frenchman, and a
> Greek. The owner of the dog drinks whisky. The tea drinker lives
> next to the Frenchman. The German has a cat. The Greek's
> neighbour's house is red. [etc., etc.] Which pet is owned by the
> man in the green house?"
>
> Can our particular puzzle be solved, or do we need more data? The
> object is, of course, to find out where the bugs are! I will
> certainly study your fonts.conf, but it may take some time.
>
> Regards, Jan
>
> -------------------------------------------------------------------------
> Take Surveys. Earn Cash. Influence the Future of IT
> Join SourceForge.net's Techsay panel and you'll get the chance to share your
> opinions on IT & business topics through brief surveys - and earn cash
> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
> _______________________________________________
> Paps-discuss mailing list
> Pap...@li...
> https://lists.sourceforge.net/lists/listinfo/paps-discuss
>