Re: [Devel] Re: [Freetype] Freetype 2 on Mac

[Dan Williams]

George,

It appears you are correct in that Apple doesn't seem to support the GSUB
table.  There are only 4 hits for GSUB on the developer site, and only 2
of them are relevant.  I also cannot find the GSUB table mentioned in the
_Apple_ TrueType spec document, leading me to believe that they do not
support it but instead as you earlier mentioned, AAT stuff.

Interestingly though, most every AAT document there hasn't been
changed/updated in 4-5 years, but most of the regular TrueType table
format documents have been updated for OS X in some way.

Dan

On 22 Oct 2003, George Williams wrote:

> On Tue, 2003-10-21 at 21:13, Dan Williams wrote:
> > 10.2/10.3 most certainly do support OpenType fonts, but to what extent  
> > I am not sure:
> I performed the following simple test on my OS/X 10.2.1 machine.
> 
> I created a font which contained a 'morx' table with a ligature
> sub-table which mapped "A B => C"
> 
> I created another font which contained a 'GSUB' table with a 'liga'
> ligature (script latin, language default) feature which mapped "A B =>
> C"
> 
> I installed both.
> 
> I ran TextEdit (the simple text application)
> 
> I typed in "AB"
>       I selected this and changed the font to the one with the
>         morx table. The ligature worked, and I saw "C".
>       I changed the font to the one with the 'GSUB' table.
>         The ligature did not work, and I saw "AB"
> 
> I conclude from this that ligatures in the GSUB table are ignored by the
> mac. I have also been told this by people from Apple.
> -------------------
> On the other hand, the mac certainly does support 'CFF ' tables (Type 2
> postscript) which are also called opentype fonts. Perhaps this is where
> the confusion lies?
> 
> Or perhaps things have changed since 10.2.1
> 
> 
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