GNU bug report logs - #66941
29.1; Emacs on Windows can't display CJK characters correctly in svg images

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Package: emacs; Reported by: Ilya Chernyshov <ichernyshovvv@HIDDEN>; dated Sun, 5 Nov 2023 05:45:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Mon, 06 Nov 2023 14:21:25 +0200
Message-Id: <83ttpz2htm.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Alan Third <alan@HIDDEN>
In-Reply-To: <ZUgk25t4-KS2iqL-@idiocy.org> (message from Alan Third on Sun, 5
 Nov 2023 23:27:23 +0000)
Subject: Re: bug#66941: 29.1; Emacs on Windows can't display CJK characters
 correctly in svg images
References: <87wmuxe43h.fsf@HIDDEN> <83bkc84ryr.fsf@HIDDEN>
 <83a5rs4rmk.fsf@HIDDEN> <ZUgk25t4-KS2iqL-@idiocy.org>
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> Date: Sun, 5 Nov 2023 23:27:23 +0000
> From: Alan Third <alan@HIDDEN>
> Cc: ichernyshovvv@HIDDEN, 66941 <at> debbugs.gnu.org
> 
> On Sun, Nov 05, 2023 at 08:54:27AM +0200, Eli Zaretskii wrote:
> > > Cc: 66941 <at> debbugs.gnu.org
> > > Date: Sun, 05 Nov 2023 08:47:08 +0200
> > > From: Eli Zaretskii <eliz@HIDDEN>
> > > 
> > > > (progn
> > > >   (require 'svg)
> > > >   (switch-to-buffer "*svg-test*")
> > > >   (let ((svg-image (svg-create 200 200))
> > > > 	(inhibit-read-only t))
> > > >     (erase-buffer)
> > > >     (svg-text svg-image "我喜欢自由软件" :y 100 :x 50)
> > > >     (svg-print svg-image)
> > > >     (image-mode)))
> > > 
> > > I cannot get Emacs on Windows to display _any_ non-ASCII text with the
> > > above recipe, not even if I use Latin-1 characters or characters from
> > > the current system codepage.  Emacs encodes non-ASCII characters as
> > > &#nnnn numbers (you can see that if you type "C-c C-c" in the
> > > *svg-test* buffer), which is probably correct, but the SVG image is
> > > not displayed for some reason.
> > > 
> > > Alan, any ideas or suggestions?
> > 
> > Could be a problem with the font used by librsvg to show text?  Maybe
> > the font doesn't have any non-ASCII characters.
> 
> This seems plausible. It should be possible to check by over-riding
> the CSS with a font you know should work:
> 
> (progn
>   (require 'svg)
>   (switch-to-buffer "*svg-test*")
>   (let ((svg-image (svg-create 200 200))
>         (inhibit-read-only t))
>     (erase-buffer)
>     (svg-text svg-image "我喜欢自由软件" :y 100 :x 50)
>     (insert-image (svg-image svg-image :css "svg{font-family:\"Noto Sans Mono CJK HK\";}"))))
> 
> Choose a font you know can show the text you're testing. I've a vague
> memory that the Noto CJK fonts behave slightly oddly on Windows, so
> maybe something else is a better choice.
> 
> I think setting the :css attribute to an empty string should reset
> librsvg so it will use its default font settings and that would let
> us see if it works right without our customisation.

Thanks.  I tried the above, and it didn't work, at least with (old)
librsvg 2.40.1 I have here.  Moreover, if I use a plain ASCII string,
which does display, the font used for display is identical whether or
not I specify font-family in the :css attribute, so I think somehow
this attribute doesn't have any effect.

Is it possible to specify a font rather than font-family?  Font
families are treated poorly on MS-Windows, so I'd prefer to specify a
particular font, to be sure.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#66941; Package emacs. Full text available.

Message received at 66941 <at> debbugs.gnu.org:


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From: Alan Third <alan@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#66941: 29.1; Emacs on Windows can't display CJK characters
 correctly in svg images
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On Sun, Nov 05, 2023 at 08:54:27AM +0200, Eli Zaretskii wrote:
> > Cc: 66941 <at> debbugs.gnu.org
> > Date: Sun, 05 Nov 2023 08:47:08 +0200
> > From: Eli Zaretskii <eliz@HIDDEN>
> > 
> > > (progn
> > >   (require 'svg)
> > >   (switch-to-buffer "*svg-test*")
> > >   (let ((svg-image (svg-create 200 200))
> > > 	(inhibit-read-only t))
> > >     (erase-buffer)
> > >     (svg-text svg-image "我喜欢自由软件" :y 100 :x 50)
> > >     (svg-print svg-image)
> > >     (image-mode)))
> > 
> > I cannot get Emacs on Windows to display _any_ non-ASCII text with the
> > above recipe, not even if I use Latin-1 characters or characters from
> > the current system codepage.  Emacs encodes non-ASCII characters as
> > &#nnnn numbers (you can see that if you type "C-c C-c" in the
> > *svg-test* buffer), which is probably correct, but the SVG image is
> > not displayed for some reason.
> > 
> > Alan, any ideas or suggestions?
> 
> Could be a problem with the font used by librsvg to show text?  Maybe
> the font doesn't have any non-ASCII characters.

This seems plausible. It should be possible to check by over-riding
the CSS with a font you know should work:

(progn
  (require 'svg)
  (switch-to-buffer "*svg-test*")
  (let ((svg-image (svg-create 200 200))
        (inhibit-read-only t))
    (erase-buffer)
    (svg-text svg-image "我喜欢自由软件" :y 100 :x 50)
    (insert-image (svg-image svg-image :css "svg{font-family:\"Noto Sans Mono CJK HK\";}"))))

Choose a font you know can show the text you're testing. I've a vague
memory that the Noto CJK fonts behave slightly oddly on Windows, so
maybe something else is a better choice.

I think setting the :css attribute to an empty string should reset
librsvg so it will use its default font settings and that would let
us see if it works right without our customisation.

-- 
Alan Third
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#66941; Package emacs. Full text available.

Message received at 66941 <at> debbugs.gnu.org:


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Date: Sun, 05 Nov 2023 08:54:27 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: alan@HIDDEN
In-Reply-To: <83bkc84ryr.fsf@HIDDEN> (message from Eli Zaretskii on Sun, 05
 Nov 2023 08:47:08 +0200)
Subject: Re: bug#66941: 29.1;
 Emacs on Windows can't display CJK characters correctly in svg images
References: <87wmuxe43h.fsf@HIDDEN> <83bkc84ryr.fsf@HIDDEN>
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> Cc: 66941 <at> debbugs.gnu.org
> Date: Sun, 05 Nov 2023 08:47:08 +0200
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> > (progn
> >   (require 'svg)
> >   (switch-to-buffer "*svg-test*")
> >   (let ((svg-image (svg-create 200 200))
> > 	(inhibit-read-only t))
> >     (erase-buffer)
> >     (svg-text svg-image "我喜欢自由软件" :y 100 :x 50)
> >     (svg-print svg-image)
> >     (image-mode)))
> 
> I cannot get Emacs on Windows to display _any_ non-ASCII text with the
> above recipe, not even if I use Latin-1 characters or characters from
> the current system codepage.  Emacs encodes non-ASCII characters as
> &#nnnn numbers (you can see that if you type "C-c C-c" in the
> *svg-test* buffer), which is probably correct, but the SVG image is
> not displayed for some reason.
> 
> Alan, any ideas or suggestions?

Could be a problem with the font used by librsvg to show text?  Maybe
the font doesn't have any non-ASCII characters.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#66941; Package emacs. Full text available.

Message received at 66941 <at> debbugs.gnu.org:


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Date: Sun, 05 Nov 2023 08:47:08 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Ilya Chernyshov <ichernyshovvv@HIDDEN>, Alan Third <alan@HIDDEN>
In-Reply-To: <87wmuxe43h.fsf@HIDDEN> (message from Ilya Chernyshov on Sun, 
 05 Nov 2023 02:00:18 +0700)
Subject: Re: bug#66941: 29.1;
 Emacs on Windows can't display CJK characters correctly in svg images
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> From: Ilya Chernyshov <ichernyshovvv@HIDDEN>
> Date: Sun, 05 Nov 2023 02:00:18 +0700
> 
> 
> Hi. Can't reproduce the issue by myself (I'm on linux), but already have
> been sent a couple of issues in my package repo.
> 
> Screenshot:
> 
> https://user-images.githubusercontent.com/9244946/280170406-64aca531-3542-40b7-9ae3-fc13ab3f1029.png
> 
> Link to the issue:
> 
> https://github.com/ichernyshovvv/org-timeblock/issues/36
> 
> Code to reproduce:
> 
> (progn
>   (require 'svg)
>   (switch-to-buffer "*svg-test*")
>   (let ((svg-image (svg-create 200 200))
> 	(inhibit-read-only t))
>     (erase-buffer)
>     (svg-text svg-image "我喜欢自由软件" :y 100 :x 50)
>     (svg-print svg-image)
>     (image-mode)))

I cannot get Emacs on Windows to display _any_ non-ASCII text with the
above recipe, not even if I use Latin-1 characters or characters from
the current system codepage.  Emacs encodes non-ASCII characters as
&#nnnn numbers (you can see that if you type "C-c C-c" in the
*svg-test* buffer), which is probably correct, but the SVG image is
not displayed for some reason.

Alan, any ideas or suggestions?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#66941; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Ilya Chernyshov <ichernyshovvv@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 29.1; Emacs on Windows can't display CJK characters correctly in
 svg images
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Hi. Can't reproduce the issue by myself (I'm on linux), but already have
been sent a couple of issues in my package repo.

Screenshot:

https://user-images.githubusercontent.com/9244946/280170406-64aca531-3542-4=
0b7-9ae3-fc13ab3f1029.png

Link to the issue:

https://github.com/ichernyshovvv/org-timeblock/issues/36

Code to reproduce:

(progn
  (require 'svg)
  (switch-to-buffer "*svg-test*")
  (let ((svg-image (svg-create 200 200))
	(inhibit-read-only t))
    (erase-buffer)
    (svg-text svg-image "=E6=88=91=E5=96=9C=E6=AC=A2=E8=87=AA=E7=94=B1=E8=
=BD=AF=E4=BB=B6" :y 100 :x 50)
    (svg-print svg-image)
    (image-mode)))
Acknowledgement sent to Ilya Chernyshov <ichernyshovvv@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#66941; Package emacs. Full text available.
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