[HarfBuzz] HarfBuzz glyph offsets

[Jonathan Blow]

>
>
> Offsets are adjustments accumulated during shaping, bearings are design
> glyph metrics. Instead of using metrics you should be using actual glyph
> box, CBox or BBox in freetype terms.


​I don't think either of these sentences is correct. The CBox contains
non-visual elements such as non-interpolated spline control points, so if
you use that, you end up wasting space. Referring once again to
http://www.freetype.org/freetype2/docs/tutorial/step2.html it says that the
bearing is the distance from the cursor position to the edge of the actual
image's bounding box. Note that this tutorial mentions calling Get_Bbox and
explicitly says you probably don't want to do it.
​
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