[NTG-context] optical bounds with hanging diacritics

Hans Hagen j.hagen at xs4all.nl
Tue Nov 27 00:33:11 CET 2018


On 11/24/2018 10:02 PM, Pablo Rodriguez wrote:
> Hans,
> 
> I added lfbd values for GFS Didot (attached) to get hanging diacritics
> in Greek.
> 
> The attached PDF document is the optput from the following code:
> 
>      \showframe
>      \setuplayout[topspace=1cm, height=middle, footer=0cm, header=0cm]
>      \definefontfeature[default][default]
>          [protrusion=quality, opbd=yes, script=grek]
>      \definefontfamily[mainface][rm][GFS Didot]
>      \setupbodyfont[mainface, 325pt]
>      \setupalign[hanging]
>      \starttext
>      Α\\Ἀ\\Α\\Ἁ\\Α\\Ἂ\\Α\\Ἃ\\Α\\Ἄ\\Α\\Ἅ\\Α\\Ἆ\\Α\\Ἇ
> 
>      Ἐ\\Ε\\Ἑ\\Ε\\Ἒ\\Ε\\Ἓ\\Ε\\Ἔ\\Ε\\Ἕ\\Ε
> 
>      Ἠ\\Η\\Ἡ\\Η\\Ἢ\\Η\\Ἣ\\Η\\Ἤ\\Η\\Ἥ\\Η\\Ἦ\\Η\\Ἧ\\Η
> 
>      Ἰ\\Ι\\Ἱ\\Ι\\Ἲ\\Ι\\Ἳ\\Ι\\Ἴ\\Ι\\Ἵ\\Ι\\Ἶ\\Ι\\Ἷ\\Ι
> 
>      Ὀ\\Ο\\Ὁ\\Ο\\Ὂ\\Ο\\Ὃ\\Ο\\Ὄ\\Ο\\Ὅ\\Ο
> 
>      Ρ\\Ῥ
> 
>      Ὑ\\Υ\\Ὓ\\Υ\\Ὕ\\Υ\\Ὗ\\Υ
> 
>      Ὠ\\Ω\\Ὡ\\Ω\\Ὢ\\Ω\\Ὣ\\Ω\\Ὤ\\Ω\\Ὥ\\Ω\\Ὦ\\Ω\\Ὧ\\Ω
>      \stoptext
> 
> 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

> Raw lfbd and rtbd values from the font could be set with
> protrusion=opentype (or a similar option).
> 
> 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)

> Many thanks for your help,
> 
> Pablo
> 
> 
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