I’d be happy to just do this with TTX if I had a clue how to edit the PREP table. I’m just trying to add SCANCTRL and the relevant bits, but I don’t understand how to add said bits after adding SCANCTRL[].
It's worth noting that the script Dave points to will replace the "prep" table with a new one that enables dropout control, but will keep the "fpgm" and "cvt " tables as well as the hinting bytecode in the glyphs. So in order for this to work sensibly, the input font must have no hinting (you'd have to remove it using other means).
ttfautohint -d is the option I asked Werner to implement which will remove all the hinting data from the font and only set the dropout control, leaving a "font hinted at the barest minimum", considerably smaller than any font actually containing hinting. So for this option, it doesn't matter whether the input font had sny hinting or not.
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ttfautohint -d is the option I asked Werner to implement which will remove all the hinting data from the font and only set the dropout control, leaving a "font hinted at the barest minimum", considerably smaller than any font actually containing hinting. So for this option, it doesn't matter whether the input font had sny hinting or not.