[NTG-context] optical bounds with hanging diacritics

Pablo Rodriguez oinos at gmx.es
Tue Nov 27 17:08:25 CET 2018

On 11/27/18 12:33 AM, Hans Hagen wrote:
> On 11/24/2018 10:02 PM, Pablo Rodriguez wrote:
>> [...]
>> BTW, to get pure lfbd values, I had to replace line 361 from
>> font-imp-quality lua with:
>>     local p = d/1000
> two issues:
> - no 1000 but units
> - we need to be able to go less extreme, so we keep factor
> so something
> local p = lfactor * d/units

Many thanks for your reply, Hans.

The new definition is fine for me.

BTW, I have an issue issue with the font feature. I cannot have both
default and the opbd as font features, such as in:

    \setuplayout[topspace=1cm, height=middle, footer=0cm, header=0cm]
        [protrusion=opentype, opbd=yes, script=grek]
        [GFS Didot][features={default, newfeature}]
    \setupbodyfont[mainface, 325pt]

I guess this may be related to "script=grek", but I don’t know whehter
I’m doing something wrong.

>> I hope it is clear now why raw values from the font are needed.
> fwiw it looks a  bit too excessive to me (i'm not sure if graphical 
> elements like those accents which are part of the character needs that 
> much protrusion)

I agree. These are excessive values, but this is rather a very
particular case.

Hanging diacritics are used only in poetry, not in prose:
(section “1.6.2 Hanging Diacritics” on page 21).

Many thanks for your help,


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