Here's how HarfBuzz does it:

 https://github.com/harfbuzz/harfbuzz/blob/master/src/hb-blob.cc

On Sat, Aug 29, 2020, 10:33 AM Vincent Torri <[email protected]>
wrote:

> On Sat, Aug 29, 2020 at 11:52 AM Werner LEMBERG <[email protected]> wrote:
> >
> >
> > >> If this really makes a difference on Windows, and if you want to
> > >> contribute such code, you are welcome to do so!
> > >
> > > I guess that mmap is useful with a font with a large size, right ?
> > > if so, do you have a font to test with ?
> >
> > You want a very large font to play around?  I suggest to try
> > `NotoSansCJK.ttc`, which is a 100MByte font:
> >
> >
> https://github.com/googlefonts/noto-cjk/blob/master/NotoSansCJK.ttc.zip
>
> thank you
>
> should I write a builds/win32/ftsystem.c ?
>
> Vincent Torri
>
>

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