Jonathan,
This is great news--thank you! There is also an OpenType feature called
Optical Bounds that is designed to do exactly this. My understanding is
that very few, if any, page layout programs support this feature. Maybe
XeTeX should be cutting-edge in this regard also? FontForge does allow the
creation of fonts with this feature, and it would be easier for users to
take values from a table in the font than having to specify them
individually.
Best wishes,
David
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