GNU bug report logs - #51155
29.0.50; Incorrect weight used in Cantarell VF

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

From: Utkarsh Singh <utkarsh190601 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; Incorrect weight used in Cantarell VF
Date: Tue, 12 Oct 2021 16:45:41 +0530

Hi,

On 2021-09-21, Arch Linux updated their Cantarell font package, which
removed classic font with variable fonts.  According to Jan Alexander
Steffens (package maintainer):

> Yeah, we only packaged VF because upstream requested to either package
> the classic fonts *or* the variable font. The VF is more powerful as
> it not just contains all the classic weights but can also interpolate
> between them.

But with these changes Emacs in now unable to distinguish between light
and regular weights.  To reproduce the bug you would have to:

1. Install latest version of font from upstream:
<https://gitlab.gnome.org/GNOME/cantarell-fonts>

2. Evaluate in "emacs -Q" session:
(progn
  (set-face-attribute 'variable-pitch nil :family "Cantarell" :weight 'regular)
  (face-font 'variable-pitch))

Also see bug report on Arch Linux bug tracker:
<https://bugs.archlinux.org/task/72212>

-- 
Utkarsh Singh
https://utkarshsingh.xyz/

Message #8 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Utkarsh Singh <utkarsh190601 <at> gmail.com>
Cc: 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Wed, 13 Oct 2021 14:39:06 +0300

> From: Utkarsh Singh <utkarsh190601 <at> gmail.com>
> Date: Tue, 12 Oct 2021 16:45:41 +0530
> 
> On 2021-09-21, Arch Linux updated their Cantarell font package, which
> removed classic font with variable fonts.  According to Jan Alexander
> Steffens (package maintainer):
> 
> > Yeah, we only packaged VF because upstream requested to either package
> > the classic fonts *or* the variable font. The VF is more powerful as
> > it not just contains all the classic weights but can also interpolate
> > between them.
> 
> But with these changes Emacs in now unable to distinguish between light
> and regular weights.  To reproduce the bug you would have to:
> 
> 1. Install latest version of font from upstream:
> <https://gitlab.gnome.org/GNOME/cantarell-fonts>
> 
> 2. Evaluate in "emacs -Q" session:
> (progn
>   (set-face-attribute 'variable-pitch nil :family "Cantarell" :weight 'regular)
>   (face-font 'variable-pitch))
> 
> Also see bug report on Arch Linux bug tracker:
> <https://bugs.archlinux.org/task/72212>

What are the numerical values of weight in these fonts?

Message #11 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Utkarsh Singh <utkarsh190601 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Wed, 13 Oct 2021 20:06:28 +0530

On 2021-10-13, 14:39 +0300, Eli Zaretskii <eliz <at> gnu.org> wrote:

> What are the numerical values of weight in these fonts?

Can you please tell me how I can get this info?

-- 
Utkarsh Singh
https://utkarshsingh.xyz/

Message #14 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Utkarsh Singh <utkarsh190601 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Wed, 13 Oct 2021 21:05:05 +0530

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

On 2021-10-13, 20:06 +0530, Utkarsh Singh <utkarsh190601 <at> gmail.com> wrote:

> On 2021-10-13, 14:39 +0300, Eli Zaretskii <eliz <at> gnu.org> wrote:
>
>> What are the numerical values of weight in these fonts?
>
> Can you please tell me how I can get this info?

Weight table:

| Face       | Weight |
|------------+--------|
| Extra bold |    205 |
| Bold       |    200 |
| Regular    |     80 |
| Light      |     50 |

Also see fc-query output attached with this email.

-- 
Utkarsh Singh
https://utkarshsingh.xyz/

[cantarell-query.txt (text/plain, attachment)]

Message #17 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Utkarsh Singh <utkarsh190601 <at> gmail.com>
Cc: 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Wed, 13 Oct 2021 19:11:54 +0300

> From: Utkarsh Singh <utkarsh190601 <at> gmail.com>
> Cc: 51155 <at> debbugs.gnu.org
> Date: Wed, 13 Oct 2021 21:05:05 +0530
> 
> >> What are the numerical values of weight in these fonts?
> >
> > Can you please tell me how I can get this info?
> 
> Weight table:
> 
> | Face       | Weight |
> |------------+--------|
> | Extra bold |    205 |
> | Bold       |    200 |
> | Regular    |     80 |
> | Light      |     50 |

I think that's the problem: Emacs thinks that Regular should have the
weight of 100, see font.c.

Message #20 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Utkarsh Singh <utkarsh190601 <at> gmail.com>, 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Wed, 13 Oct 2021 22:29:00 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Weight table:
>> 
>> | Face       | Weight |
>> |------------+--------|
>> | Extra bold |    205 |
>> | Bold       |    200 |
>> | Regular    |     80 |
>> | Light      |     50 |
>
> I think that's the problem: Emacs thinks that Regular should have the
> weight of 100, see font.c.

So this is basically bug#32210 again, I think?

When we last discussed this (a couple years ago), I said I'd try to look
into this complex issue, so perhaps now's the time.  I'll start poking
at this morass tomorrow, I think.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #25 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Utkarsh Singh <utkarsh190601 <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Thu, 14 Oct 2021 08:13:33 +0530

On 2021-10-13, 22:29 +0200, Lars Ingebrigtsen <larsi <at> gnus.org> wrote:

> Eli Zaretskii <eliz <at> gnu.org> writes:
>
>>> Weight table:
>>> 
>>> | Face       | Weight |
>>> |------------+--------|
>>> | Extra bold |    205 |
>>> | Bold       |    200 |
>>> | Regular    |     80 |
>>> | Light      |     50 |
>>
>> I think that's the problem: Emacs thinks that Regular should have the
>> weight of 100, see font.c.
>
> So this is basically bug#32210 again, I think?
>
> When we last discussed this (a couple years ago), I said I'd try to look
> into this complex issue, so perhaps now's the time.  I'll start poking
> at this morass tomorrow, I think.

For testing, I changed Regular to weight of 80 but Emacs is still
loading the Light variant.

-- 
Utkarsh Singh
https://utkarshsingh.xyz/

Message #28 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: utkarsh190601 <at> gmail.com, 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Thu, 14 Oct 2021 09:26:22 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: Utkarsh Singh <utkarsh190601 <at> gmail.com>,  51155 <at> debbugs.gnu.org
> Date: Wed, 13 Oct 2021 22:29:00 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> Weight table:
> >> 
> >> | Face       | Weight |
> >> |------------+--------|
> >> | Extra bold |    205 |
> >> | Bold       |    200 |
> >> | Regular    |     80 |
> >> | Light      |     50 |
> >
> > I think that's the problem: Emacs thinks that Regular should have the
> > weight of 100, see font.c.
> 
> So this is basically bug#32210 again, I think?

No, not necessarily: that one was about "regular" vs "medium", not vs
"light".

Message #31 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Utkarsh Singh <utkarsh190601 <at> gmail.com>
Cc: larsi <at> gnus.org, 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Thu, 14 Oct 2021 10:38:43 +0300

> From: Utkarsh Singh <utkarsh190601 <at> gmail.com>
> Cc: 51155 <at> debbugs.gnu.org
> Date: Thu, 14 Oct 2021 08:13:33 +0530
> 
> On 2021-10-13, 22:29 +0200, Lars Ingebrigtsen <larsi <at> gnus.org> wrote:
> 
> > Eli Zaretskii <eliz <at> gnu.org> writes:
> >
> >>> Weight table:
> >>> 
> >>> | Face       | Weight |
> >>> |------------+--------|
> >>> | Extra bold |    205 |
> >>> | Bold       |    200 |
> >>> | Regular    |     80 |
> >>> | Light      |     50 |
> >>
> >> I think that's the problem: Emacs thinks that Regular should have the
> >> weight of 100, see font.c.
> >
> > So this is basically bug#32210 again, I think?
> >
> > When we last discussed this (a couple years ago), I said I'd try to look
> > into this complex issue, so perhaps now's the time.  I'll start poking
> > at this morass tomorrow, I think.
> 
> For testing, I changed Regular to weight of 80 but Emacs is still
> loading the Light variant.

That's not necessarily enough, as there's more code involved here.

I think only stepping with a debugger through the relevant code will
tell us what happens and why.

Message #34 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Utkarsh Singh <utkarsh190601 <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Wed, 02 Feb 2022 14:00:55 +0530

Hello maintainers,

On 2021-10-14, 08:13 +0530, Utkarsh Singh <utkarsh190601 <at> gmail.com> wrote:

> On 2021-10-13, 22:29 +0200, Lars Ingebrigtsen <larsi <at> gnus.org> wrote:
>
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>>
>>>> Weight table:
>>>> 
>>>> | Face       | Weight |
>>>> |------------+--------|
>>>> | Extra bold |    205 |
>>>> | Bold       |    200 |
>>>> | Regular    |     80 |
>>>> | Light      |     50 |
>>>
>>> I think that's the problem: Emacs thinks that Regular should have the
>>> weight of 100, see font.c.
>>
>> So this is basically bug#32210 again, I think?
>>
>> When we last discussed this (a couple years ago), I said I'd try to look
>> into this complex issue, so perhaps now's the time.  I'll start poking
>> at this morass tomorrow, I think.
>
> For testing, I changed Regular to weight of 80 but Emacs is still
> loading the Light variant.

Please close this bug report, Cantarell VF is working fine now.

-- 
Utkarsh Singh
https://utkarshsingh.xyz/

Message #37 received at 51155 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Utkarsh Singh <utkarsh190601 <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 51155 <at> debbugs.gnu.org
Subject: Re: bug#51155: 29.0.50; Incorrect weight used in Cantarell VF
Date: Wed, 02 Feb 2022 18:52:53 +0100

Utkarsh Singh <utkarsh190601 <at> gmail.com> writes:

> Please close this bug report, Cantarell VF is working fine now.

OK; closing this report, then.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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