optical bounds with hanging diacritics

optical bounds with hanging diacritics

[Pablo Rodriguez]

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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

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.

Many thanks for your help,

Pablo
-- 
http://www.ousia.tk

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Re: optical bounds with hanging diacritics

[luigi scarso]

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On Sun, Nov 25, 2018 at 7:24 PM Pablo Rodriguez <oinos@gmx.es> 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:
>

the pdf is too big .. I have unlocked it for this time...

-- 
luigi

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Re: optical bounds with hanging diacritics

[Pablo Rodriguez]

On 11/25/18 7:26 PM, luigi scarso wrote:
> On Sun, Nov 25, 2018 at 7:24 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:
> 
> 
> the pdf is too big .. I have unlocked it for this time...

Sorry, Luigi, I forgot that we had a maximum size for the message
(attachments included).

The PDF document isn’t that big (30KB). The font with the OT lfbd values
is a bigger file (177KB).

Pablo
-- 
http://www.ousia.tk
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Re: optical bounds with hanging diacritics

[Hans Hagen]

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
> 
> 
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
> 


-- 

-----------------------------------------------------------------
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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: optical bounds with hanging diacritics

[Pablo Rodriguez]

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]
    \definefontfeature[newfeature]
        [protrusion=opentype, opbd=yes, script=grek]
    \definefontfamily[mainface][rm]
        [GFS Didot][features={default, newfeature}]
    \setupbodyfont[mainface, 325pt]
    \setupalign[hanging]
    \starttext
    Α\\Ἇ
    \stoptext

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:
https://www.researchgate.net/publication/2417759_From_Unicode_to_Typography_a_Case_Study_the_Greek_Script
(section “1.6.2 Hanging Diacritics” on page 21).

Many thanks for your help,

Pablo
-- 
http://www.ousia.tk
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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