[HarfBuzz] Question about HarfBuzz-ng CTL Shaper Status

[Ed]

Since my primary goal is to test a Tai Tham font that I am attempting
to create which incorporates aforementioned OpenType features, I
wonder what is the best way to test it?

>>
>> No. Firefox is using harfbuzz only for certain "simple" scripts such as Latin; it
>> falls back to platform code (CoreText on OS X, Uniscribe on Windows) for
>> complex scripts.
>>

On Thu, Sep 16, 2010 at 10:29 AM, Ed <ed.trager at gmail.com> wrote:

>
> And old Pango-harfbuzz-whatever on Linux?
>
> Also, if I am trying to test Tai Tham Unicode fonts which utilize
> OpenType features such as mark-to-base (mark), mark-to-mark (mkmk),
> and contextual ligatures (clig) --but doing so using Latin "dflt"
> since there is no tag for Tai Tham-- is Firefox 4x really using
> Harfbuzz-ng or not?
>
> It seems possible --even likely given the kinds of results I am seeing
> so far-- that Firefox is perhaps marking the runs of text as being Tai
> Tham and so would not be using the new Harfbuzz-ng
>
> And is there any possible way to know what renderer FF is really using
> for any given run of text.  I guess the answer is probably not ...
>
> - Ed
>