Re: issue with optical bounds (OpenType)

[Hans Hagen <j.hagen@xs4all.nl>]

On 12/9/2018 5:35 PM, Pablo Rodriguez wrote:
> On 12/9/18 2:22 PM, Hans Hagen wrote:
>>> [...]
>> you confuse mechanism:
>>
>> - protrusion only happen at the start and end of the line
>> - kerning (like single does) happens everywhere
>>
>> so, you need to extend "lfbd" and not use some own kerning feature
>> "leftbounds" which applyu it everywhere while "lfbd" is treated special
>> i.e. sets the protrusion values (when "opbd" is enabled) ... no other
>> way to do this
> 
> In that case, I have some questions:
> 
> -Is it possible to enable standard protrusion with opbd? (I mean, I
> don’t any other character protruded when opbd is enabled.)

well, you want to use what the font provides and if the font is 
incomplete i'd not trust the bits that are there either

when opbd is enabled protrusion is taken from that so you should add all 
chars that you want to prodrude then in an addendum to is (k

> -Is there any way that I can apply pure raw lfbd/rtbd values to
> protrusion with no other protrusion calculation at all in opbd?

you can create your own vectors if you want

> -In order to avoid editing all the Greek fonts to get hanging
> diacritics: is there any way to replicate the lfbd feature with
> "fonts.handlers.otf.addfeature"?

probably with some lua magic one can do a lot but these are typical 
things i do when i need them (also because one needs to check the whole 
of unicode and cook up categories, this kind of stuff is: do it all 
robust and well or don't do it; also one doesn't know how consistent 
font designs are)
  Hans


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