[HarfBuzz] x_offset and y_offset

[Samiullah Khawaja]

What are the semantics of the x_offset and y_offset values.

Is x_offset is like the left bearing difference of the glyph in "freetype
glyph_bitmap->left" and the y_offset is like the top bearing of the glyph
in "freetype glyph_bitmap->top" (upwards distance from baseline)

Are these values 16.16 fractional values or 26.6 fractional values?

Thanks,
Sami
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