Re: [ft-devel] ttfautohint: How to install

[Werner LEMBERG]

>> If you limit hinting-range-max to a value where the blue zones are
>> still handled, the generated bytecode uses this hinting set for all
>> larger sizes also.  Finding a good value for hinting-range-max has
>> to be done with trial and error, but a waterfall already indicates
>> bad sizes, so hinting-range-max must be less than that).
> 
> hmm i have tested varying min-range & max-range - by shifting ranges
> i can get the 'egging issue' to move up/down a ppem size, so the
> issue persists but just at different ppem's.

OK.

> It seems to me that the egging issue is caused by the top curves of
> the 'o' snapping to the top edge of the pixel that corresponds to
> that alignment zone, if i force these curves to snap to the bottom
> edge of the alignment zone pixel then the egging is fixed!  Of
> course then i need all pixels in the alignment zone to snap to the
> bottom of the pixel to get uniform x-height throughout all glyphs.
> 
> Could there be a way to force pixel snapping to the bottom of pixel
> in some alignment zones like this with ttfautohint?

While I basically understand what you write, I have some difficulties
to imagine it visually.  Could you provide FontLab snapshots of an
`egged o', together with your proposed fix?


    Werner