Re: [ft-devel] autofit CJK module

[Chia-I Wu]

On Fri, Feb 10, 2006 at 03:46:27PM +0100, Werner LEMBERG wrote:
> > The CJK module is currently in experimental stage and is disabled by
> > default.  If you are interested in helping or want to have a try on
> > it, it can enabled by #define AF_MOD_CJK in src/autofit/afcjk.c.
> Please move AF_MOD_CJK to ftoption.h and enable it by default.  This
> makes it easier to test.
> 
> BTW, I see code like this in the new module:
> 
>   FT_Pos  threshold = 50 * metrics->units_per_em / 2048;
> 
> Where does the `2048' come from?  Please add a comment.
I wanted to ask about this on the list but I forgot :(

The thresholds here and in segment linking are in font units.  They
should be proportional to units_per_em.  As they work great for fonts
with 2048 units, I assume they are decided with 2048 units in mind.  If
this is not the case, please replace 2048 with an appropriate value.

I did the same to the latin module.  All Type 1 fonts would be affected.
(And I just found that the 3000 in the scoring formula should be scaled
too.)

-- 
Regards,
olv