From: Eli Zaretskii <eliz@gnu.org>
To: martin rudalics <rudalics@gmx.at>
Cc: holtzermann17@gmail.com, 19194@debbugs.gnu.org
Subject: bug#19194: 24.4.50; `window-body-width' is not dynamic relative to font size changes
Date: Fri, 28 Nov 2014 10:49:36 +0200 [thread overview]
Message-ID: <83h9xjn1zz.fsf@gnu.org> (raw)
In-Reply-To: <54782441.3030600@gmx.at>
> Date: Fri, 28 Nov 2014 08:29:05 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: holtzermann17@gmail.com, 19194@debbugs.gnu.org
>
> > Faces are frame-specific. The same face can have different attributes
> > on each frame, and that includes the size.
>
> That's what I'm trying to fathom out here all the time. So when
> calculating the actual height of a character as it will be displayed in
> a window I have to apply (in some order) the height attribute specified
> by (1) the font of the frame the window belongs to, (2) the font of the
> buffer shown in the window, and (3) the font of the default face.
We always use the current default face's font for this. Otherwise,
you get to a problem that IMO is insoluble even in principle.
> >> Is this the final value as it would be displayed or could the height
> >> of "the font of the frame's 'default' face" get mixed in afterwards?
> >
> > The former, I think.
>
> OK. Now how do I get the `default-font-width' from that?
You need help from Emacs, because it knows everything about that
font's metrics. But we don't have an API for that for now.
> > default-line-height includes the line-spacing.
>
> I see. Silly of me to ask.
>
> The doc-string of this should be slightly improved because OT1H
> `line-spacing' is buffer-local and OTOH "the frame" in
>
> The value includes `line-spacing', if any, defined for the buffer
> or the frame.
>
> is slightly ambiguous.
It's ambiguous on purpose: the line-spacing can be specified in
several ways. Feel free to improve the doc string.
> >> > Btw, the OP wanted the width of the window, not its height, AFAIR.
> >>
> >> ... we would need `window-screen-columns' too.
> >
> > That will be harder, unless we change some APIs. We currently don't
> > have the font width in what font-info returns.
>
> Is there a way to approximate the "width of a character" in points from
> (1) its height and (2) its width attribute?
There's no need: the width of a font is well defined, and the display
engine uses it all the time. We just don't expose it in the font-info
API; we should add that.
next prev parent reply other threads:[~2014-11-28 8:49 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-26 13:47 bug#19194: 24.4.50; `window-body-width' is not dynamic relative to font size changes Joe Corneli
2014-11-26 15:55 ` Stefan Monnier
2014-11-26 16:34 ` Joe Corneli
2014-11-26 17:06 ` Eli Zaretskii
2014-11-26 16:04 ` Eli Zaretskii
2014-11-27 9:44 ` martin rudalics
2014-11-27 10:54 ` Joe Corneli
2014-11-27 18:35 ` martin rudalics
2014-11-27 18:52 ` Eli Zaretskii
2014-11-27 19:58 ` martin rudalics
2014-11-27 20:43 ` Eli Zaretskii
2014-11-28 7:29 ` martin rudalics
2014-11-28 8:49 ` Eli Zaretskii [this message]
2014-11-28 18:38 ` martin rudalics
2014-11-28 19:20 ` Eli Zaretskii
2014-12-19 19:40 ` Eli Zaretskii
2014-12-20 10:10 ` martin rudalics
2014-12-20 11:52 ` Joe Corneli
2014-12-20 14:49 ` martin rudalics
2014-12-20 16:18 ` Eli Zaretskii
2014-12-20 16:31 ` martin rudalics
2014-12-20 16:47 ` Eli Zaretskii
2014-12-20 17:51 ` martin rudalics
2014-12-20 18:29 ` Eli Zaretskii
2014-11-27 20:23 ` Joe Corneli
2014-11-28 7:27 ` martin rudalics
2014-11-27 16:17 ` Eli Zaretskii
2014-11-27 18:35 ` martin rudalics
2014-11-27 18:46 ` Eli Zaretskii
2014-11-27 19:58 ` martin rudalics
2014-11-27 20:37 ` Eli Zaretskii
2014-11-28 7:27 ` martin rudalics
2014-11-28 8:42 ` Eli Zaretskii
2022-02-10 8:16 ` bug#19194: bug#20022: 24.4.90; window-body-height, window-body-width wrong value after text-scale-adjust Lars Ingebrigtsen
2022-02-10 17:39 ` bug#19194: [External] : " Drew Adams
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