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[bug #61751] want metric 'type' data for character-cell fonts
From: |
G. Branden Robinson |
Subject: |
[bug #61751] want metric 'type' data for character-cell fonts |
Date: |
Fri, 31 Dec 2021 17:08:41 -0500 (EST) |
User-agent: |
Lynx/2.8.9rel.1 libwww-FM/2.14 SSL-MM/1.4.1 GNUTLS/3.6.7 |
URL:
<https://savannah.gnu.org/bugs/?61751>
Summary: want metric 'type' data for character-cell fonts
Project: GNU troff
Submitted by: gbranden
Submitted on: Fri 31 Dec 2021 10:08:39 PM UTC
Category: Font - others
Severity: 1 - Wish
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
_______________________________________________________
Details:
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.
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