Halo Glyphs generation query

[Boppe, Balakrishna (D&G COE)]

Hi,

Can someone please help or provide any guidance on how to get halo effect 
around each glyph generated by Freetype . We use 2.9.1 Freetype version.

I see an example from the below Freetype website. Is this is the best way or 
are there any other simple, effective ways to generate halos ? Please guide.

https://github.com/genesi/freetype/blob/master/freetype/docs/tutorial/example2.cpp

Thanks,
Bala.