[HarfBuzz] I got hb/ft working but I don't know how

[Behdad Esfahbod]

On 13-10-01 01:06 PM, Eduardo Castineyra wrote:

>>> 4) What is get_ft_library for? Should I be calling it instead of
>>> FT_Init_FreeType?
>> get_ft_library() is not public, so I guess you don’t need to (can’t
>> even?) use it.
> 
> Our main concern is I don't know what would happen if, for instance, we call
> the shaper from two different threads, given that ft_library is static.

The static ft_library is not used by hb_ft_font_create().  As long as you use
different FT_Library's from different threads, you are safe.


> /* Thread-safe, lock-free, FT_Library */
> static FT_Library ft_library;
> 
> Despite the "Thread-safe" comment, we have experienced a lot of problems when
> two threads are using the same FT_library. So I don't understand what the
> "Thread-safe" claim is based on.

The "thread-safe" claim is in the initialization of the ft_library variable
itself, not about the implementation of FT_Library functions.

> Also, do most users rely on hb-ft? Or they usually make their own font parsers?

No one usually make their own font parsers.  But most serious users don't use
hb-ft and hook up hb to their graphics library (cairo, win32, webkit, skia,
whatever).  Most small users use hb-ft.

-- 
behdad
http://behdad.org/