GNU bug report logs - #33648
25.2; feature request: configurable position of strike-through line

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Robert Samal <samal <at> iuuk.mff.cuni.cz>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.2; feature request: configurable position of strike-through line
Date: Thu, 6 Dec 2018 09:20:21 +0100

When I use set-face-attribute to give some text a strike-through
attribute, I see that emacs behaves differently from other pieces of
software: Apparently, the line is drawn at the level of half the glyph's
height -- which causes the line to be just touching letters like "a",
"c", "e", ... and it isn't perceived as striking the text out (at least
not by me).

In comparison, web browsers interpreting html strike tag make the
line at the level of half of the "small lowercase letters" -- basically
at the level of the line in lowercase "e". The same is done by Libre
Office ... and others.

My suggestion is to make this configurable in some way. I'm not sure,
if it would be better to have a global option for all files, or
if "(set-face-attribute ... :strike-through" should accept more choices
to make each line configurable. (I personally would change all of my
striking lines, if possible.)

Thanks in advance for considering this, for some uses (in particular
org-mode) this would help a lot.

Robert Samal, samal <at> iuuk.mff.cuni.cz


In GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21)
of 2017-09-22, modified by Debian built on lgw01-amd64-050
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.1 LTS

Configured using:
'configure --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --with-pop=yes
--enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp 

--with-sound=alsa --without-gconf --build x86_64-linux-gnu
--prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --with-pop=yes
--enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp 

--with-sound=alsa --without-gconf --with-x=yes --with-x-toolkit=gtk3
--with-toolkit-scroll-bars 'CFLAGS=-g -O2
-fdebug-prefix-map=/build/emacs25-jYekUr/emacs25-25.2+1=.
-fstack-protector-strong -Wformat -Werror=format-security -Wall'
'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
value of $LC_ALL:
value of $LC_CTYPE: en_GB.utf8
value of $LC_MESSAGES: en_GB.utf8
value of $LC_MONETARY: cs_CZ.utf8
value of $LC_NUMERIC: cs_CZ.utf8
value of $LC_TIME: en_GB.utf8
value of $LANG: cs_CZ.utf8
value of $XMODIFIERS: @im=ibus
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Major mode: Info

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Recent messages:
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user-error: This is the last Info node you looked at [2 times]
C-c y is undefined
Saving file /home/samal/.emacs.d/.cache/recentf...
Wrote /home/samal/.emacs.d/.cache/recentf

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Features:
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Message #8 received at 33648 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Robert Samal <samal <at> iuuk.mff.cuni.cz>
Cc: 33648 <at> debbugs.gnu.org
Subject: Re: bug#33648: 25.2; feature request: configurable position of
 strike-through line
Date: Mon, 31 Aug 2020 11:21:09 +0000

[Message part 1 (text/plain, inline)]

tags 33648 + confirmed
thanks

Robert Samal <samal <at> iuuk.mff.cuni.cz> writes:

> When I use set-face-attribute to give some text a strike-through
> attribute, I see that emacs behaves differently from other pieces of
> software: Apparently, the line is drawn at the level of half the glyph's
> height -- which causes the line to be just touching letters like "a",
> "c", "e", ... and it isn't perceived as striking the text out (at least
> not by me).
>
> In comparison, web browsers interpreting html strike tag make the
> line at the level of half of the "small lowercase letters" -- basically
> at the level of the line in lowercase "e". The same is done by Libre
> Office ... and others.
>
> My suggestion is to make this configurable in some way. I'm not sure,
> if it would be better to have a global option for all files, or
> if "(set-face-attribute ... :strike-through" should accept more choices
> to make each line configurable. (I personally would change all of my
> striking lines, if possible.)
>
> Thanks in advance for considering this, for some uses (in particular
> org-mode) this would help a lot.

This is what I see on current master:

[Message part 2 (text/plain, attachment)]

[bug-33648-emacs-orig.png (image/png, attachment)]

[bug-33648-libreoffice.png (image/png, attachment)]

[Message part 5 (text/plain, attachment)]

[bug-33648-with-patch.png (image/png, attachment)]

[Message part 7 (text/plain, attachment)]

Message #11 received at 33648 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Robert Samal <samal <at> iuuk.mff.cuni.cz>
Cc: 33648 <at> debbugs.gnu.org
Subject: Re: bug#33648: 25.2; feature request: configurable position of
 strike-through line
Date: Mon, 31 Aug 2020 11:35:50 +0000

Stefan Kangas <stefan <at> marxist.se> writes:

> I mucked around a bit and came up with the below diff.  It is probably
> not the correct fix, but does make it slightly better for me.  Someone
> who understands this better would need to investigate this properly.

Actually, looking at this more, I'm starting to get convinced that
LibreOffice is actually just positioning the line at the upper case
glyph height divided by 3 instead of 2.

I had a look also at Firefox, and, if I'm not mistaken, they place the
line at half the height of the lower-case glyph.  (Perhaps that makes
even more sense?)  I used the following link for testing:

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/strike#Example

Best regards,
Stefan Kangas

Message #14 received at 33648 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: 33648 <at> debbugs.gnu.org, samal <at> iuuk.mff.cuni.cz
Subject: Re: bug#33648: 25.2;
 feature request: configurable position of strike-through line
Date: Mon, 31 Aug 2020 17:37:13 +0300

> From: Stefan Kangas <stefan <at> marxist.se>
> Date: Mon, 31 Aug 2020 11:21:09 +0000
> Cc: 33648 <at> debbugs.gnu.org
> 
> > When I use set-face-attribute to give some text a strike-through
> > attribute, I see that emacs behaves differently from other pieces of
> > software: Apparently, the line is drawn at the level of half the glyph's
> > height -- which causes the line to be just touching letters like "a",
> > "c", "e", ... and it isn't perceived as striking the text out (at least
> > not by me).
> >
> > In comparison, web browsers interpreting html strike tag make the
> > line at the level of half of the "small lowercase letters" -- basically
> > at the level of the line in lowercase "e". The same is done by Libre
> > Office ... and others.

Web browsers and the rest normally don't have to support display
elements of different height on the same screen line.

> > My suggestion is to make this configurable in some way. I'm not sure,
> > if it would be better to have a global option for all files, or
> > if "(set-face-attribute ... :strike-through" should accept more choices
> > to make each line configurable. (I personally would change all of my
> > striking lines, if possible.)

Patches to make the offset configurable via a Lisp variable are
welcome.  (I'm not sure the result will be prettier, except in some
very special cases, but if someone wants to shoot themselves in the
foot, why not?)

> I'm have no idea how to fix it; the font code is pretty opaque to me.

The code to handle this is quite simple: search for strike_through_p
in xterm.c.  (We have similar code in w32term.c and nsterm.m.)

> I mucked around a bit and came up with the below diff.

I found no diffs in your message.

Message #17 received at 33648 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: 33648 <at> debbugs.gnu.org, samal <at> iuuk.mff.cuni.cz
Subject: Re: bug#33648: 25.2;
 feature request: configurable position of strike-through line
Date: Mon, 31 Aug 2020 17:39:57 +0300

> From: Stefan Kangas <stefan <at> marxist.se>
> Date: Mon, 31 Aug 2020 11:35:50 +0000
> Cc: 33648 <at> debbugs.gnu.org
> 
> Actually, looking at this more, I'm starting to get convinced that
> LibreOffice is actually just positioning the line at the upper case
> glyph height divided by 3 instead of 2.
> 
> I had a look also at Firefox, and, if I'm not mistaken, they place the
> line at half the height of the lower-case glyph.

What happens/will happen if the same screen line has characters from
fonts of different height, all of them with strike-through? doesn't
the strike-through line break?

Message #20 received at 33648 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: 33648 <at> debbugs.gnu.org, samal <at> iuuk.mff.cuni.cz
Subject: Re: bug#33648: 25.2;
 feature request: configurable position of strike-through line
Date: Mon, 31 Aug 2020 17:40:10 +0300

> From: Stefan Kangas <stefan <at> marxist.se>
> Date: Mon, 31 Aug 2020 11:35:50 +0000
> Cc: 33648 <at> debbugs.gnu.org
> 
> Actually, looking at this more, I'm starting to get convinced that
> LibreOffice is actually just positioning the line at the upper case
> glyph height divided by 3 instead of 2.
> 
> I had a look also at Firefox, and, if I'm not mistaken, they place the
> line at half the height of the lower-case glyph.

What happens/will happen if the same screen line has characters from
fonts of different height, all of them with strike-through? doesn't
the strike-through line break in Firefox and the likes?

Message #23 received at 33648 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Robert Samal <samal <at> iuuk.mff.cuni.cz>
Cc: 33648 <at> debbugs.gnu.org
Subject: Re: bug#33648: 25.2; feature request: configurable position of
 strike-through line
Date: Mon, 31 Aug 2020 17:42:43 +0000

[Message part 1 (text/plain, inline)]

Stefan Kangas <stefan <at> marxist.se> writes:

> 2. The strike-through line is hard coded to 1 pixel in our case, whereas
>    LibreOffice scales it up as the font size increases.

I've attached a suggested patch to change the strike-through line
depending on the glyph size.  The constant factor was found by
experimentation and produces reasonable results here.

Best regards,
Stefan Kangas

[0001-Make-strike-through-thicker-for-larger-font-sizes.patch (text/x-diff, attachment)]

Message #26 received at 33648 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: 33648 <at> debbugs.gnu.org, samal <at> iuuk.mff.cuni.cz
Subject: Re: bug#33648: 25.2;
 feature request: configurable position of strike-through line
Date: Mon, 31 Aug 2020 21:43:42 +0300

> From: Stefan Kangas <stefan <at> marxist.se>
> Date: Mon, 31 Aug 2020 17:42:43 +0000
> Cc: 33648 <at> debbugs.gnu.org
> 
> I've attached a suggested patch to change the strike-through line
> depending on the glyph size.  The constant factor was found by
> experimentation and produces reasonable results here.

Which glyph, though?  Emacs draws glyphs in series, called "glyph
string".  All the glyphs in a glyph string share the same face (and
thus the same font), but that doesn't mean all the glyphs are of the
same height.  And here...

> --- a/src/xterm.c
> +++ b/src/xterm.c
> @@ -3931,7 +3931,7 @@ x_draw_glyph_string (struct glyph_string *s)
>  	  int glyph_height = s->first_glyph->ascent + s->first_glyph->descent;
>  	  /* Strike-through width and offset from the glyph string's
>  	     top edge.  */
> -          unsigned long h = 1;
> +	  unsigned long h = STRIKE_THROUGH_WIDTH (glyph_height);
>            unsigned long dy = (glyph_height - h) / 2;

..glyph_height is simply the height of the first glyph in the glyph
string.  Which could be anything, whereas you seem to assume that all
of the glyphs in a glyph string are of the same height.  IOW, you are
repeating the same "mistake" we do now, just with a different fraction
value.  Wanna bet that it will break with some fonts?

That is why I suggested a Lisp-exposed variable that could be set to
the offset in pixels of the strike-through line from the base.  (If
you want to be fancy, the Lisp variable could also be a float, in
which case it will be interpreted as a fraction of the first glyph's
height.)  This should be user-controlled, which will allow users (or
Lisp programs) to set that as they see fit, without requiring us to
second-guess up front what they would like.

Thanks.

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