Re: Font priorities

[Eric Mader <mader jtcsv com>]

At 07:27 PM 2/4/2003, Stefan Baums wrote:
> Yes!  Thank you very much.  Removing the FreeFont and ClearlyU fonts
> fixed the problem as far as Devanagari is concerned.  (Arabic is still
> broken, but then I probably shouldn't complain, since I don't have an
> Arabic OpenType font installed.  On the other hand, I guess Pango
> _could_ assemble the Arabic from presentation forms in the fonts
> available... but I'm not really Arabic.)

The way I handle this in the ICU LayoutEngine is with a canned GSUB table 
built from the Unicode character database. This canned table uses the 
Unicode points instead of glyph IDs, so the initial character to glyph 
mapping just copies the character codes. There needs to be a *real* 
character to glyph mapping done after GSUB processing. I also had to modify 
the GSUB processing to take an optional filter so that a ligature 
substitution is only processed if the font actually contains a character 
for the particular presentation form.

> Many thanks,
> Stefan

Regards,
Eric