Blue zones are simply a declaration of font properties that the
designer specifies. It is up to the hint interpreter to decide how
to use that data. For example, there is a heuristic in the Adobe
CFF interpreter that synthesizes charstring hints from blue zone
data.
Very interesting! This is exactly what Nikolaus proposes, too. Can
you provide some details?
This would also help with fonts that have incomplete hints, like the URW
fonts shipping with Ghostscript. They have blue zones and hints, just...
not everywhere they need to be. Some figures in Nimbus Sans and the rest
of the family miss hints at the top of glyphs, which currently messes
with hinting.
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