[HarfBuzz] Computing necessary canvas size to render text

[Tiffany Bennett]

I am using harfbuzz + cairo + freetype2 to perform text rendering in my
project, and I  haven't been able to find any functions to help me figure
out how large of a surface I will need to create in order to fit all the
text. I ended up writing my own function, but it always creates too small
of a surface and I'm not sure how to do it correctly.
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