Re: [Devel] query about GSUB

[Werner LEMBERG]

>       We are using Extension engine of free-type for almost a year
> or so.

Very nice!  So it seems to work with Indic fonts (which I've never
tested)...  Is it possible to see your results somewhere?

I would be glad to hear more about your experience with the FreeType's
OpenType interface since we are going to improve it right now (i.e.,
we are going to implement a text layout library on top of FreeType 2).

>       in the file ftxgsub.c in function TT_GSUB_Add_String() there
> is a line which says
> 
>   ULong size = out->pos + num_out + 256L;
> 
> I do not know why *256* is added to the size, it is causing big
> memory leak, so i changed it to
> 
>   ULong size = out->pos + num_out;
>
> and still the things work, i just wanted to know if i am missing out
> on something important or it is really a bug.

The idea is to allocate additional 256 bytes of memory to avoid
reallocation again and again:

    if ( out->pos + num_out >= out->allocated )
    {
      ULong  size = out->pos + num_out + 256L;
      ...

Where is the problem?  Maybe 256 is chosen too large.  And what kind
of `memory leak'?  Maybe waste of memory.  In the docs it is written
you have to manually deallocate a TTO_GSUB_String object if it isn't
used anymore.


    Werner