bugGNU roff - Bugs: bug #61751, want metric 'type' data for...

 
 

bug #61751: want metric 'type' data for character-cell fonts

Submitter:  G. Branden Robinson <gbranden>
Submitted:  Fri 31 Dec 2021 10:08:39 PM UTC
   
 
Category:  Font - others/general Severity:  1 - Wish
Item Group:  Feature change Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Planned Release:  None
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Fri 31 Dec 2021 10:08:39 PM UTC, original submission:  

The "character type" (ascender, descender, both, neither)
information for nroff device fonts is typically absent.  At
first I thought this was a defect in groff.  I then checked
Heirloom and found it was consistent with that implementation,
and also with Unix V7 nroff.

I'm not aware of any documentation anywhere that mentions this
fact.  CSTR #54 doesn't (nor does it give a formal definition
of the ascender datum--its definition of "ascender", we must
infer from its example of "Y", is a glyph that is taller than
than the x-height of the font, not one with a serif or other
feature that renders it taller than a capital letter in the
font).

I reckon this isn't high-priority since nothing seems to really
expect to use the `ct` register after interpolating a \w escape
sequence on an nroff device to perform vertical spacing
adjustment.

In the meantime I intend to document it, though.

G. Branden Robinson <gbranden>
Group administrator

 

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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2022-01-11 gbranden Item GroupNone Feature change

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