GNU bug report logs - #37972
Emacs cannot deal with .webp suffix

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

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-gnu-emacs <at> gnu.org
Subject: Emacs cannot deal with .webp suffix
Date: Tue, 29 Oct 2019 01:54:39 +0800

$ file *
X.webp: RIFF (little-endian) data, Web/P image...

$ emacs X.webp #binary mess
$ ln X.webp X.gif
$ emacs X.gif #works fine

It doesn't matter what the suffix is: jpg, gif all work the same. Just
webp is not recognized yet.

emacs-version "26.3"

Message #8 received at 37972 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Cc: 37972 <at> debbugs.gnu.org
Subject: Re: bug#37972: Emacs cannot deal with .webp suffix
Date: Tue, 29 Oct 2019 21:44:25 +0100

積丹尼 Dan Jacobson <jidanni <at> jidanni.org> writes:

> $ file *
> X.webp: RIFF (little-endian) data, Web/P image...
>
> $ emacs X.webp #binary mess
> $ ln X.webp X.gif
> $ emacs X.gif #works fine
>
> It doesn't matter what the suffix is: jpg, gif all work the same. Just
> webp is not recognized yet.

Emacs 27 can display these image formats if you have

(setq image-use-external-converter t)

But this bug report reminded me that we had agreed on defaulting these
exotic image formats to `image-mode', so I've now done that (as well as
fixing the UX of being unable to display images slightly).

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

Message #15 received at 37972 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 37972 <at> debbugs.gnu.org,
 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Subject: Re: bug#37972: Emacs cannot deal with .webp suffix
Date: Wed, 30 Oct 2019 01:32:08 +0200

>> $ file *
>> X.webp: RIFF (little-endian) data, Web/P image...
>>
>> $ emacs X.webp #binary mess
>> $ ln X.webp X.gif
>> $ emacs X.gif #works fine
>>
>> It doesn't matter what the suffix is: jpg, gif all work the same. Just
>> webp is not recognized yet.

Renaming .webp to .gif displays it, but also spews into stderr:

  Decoded /tmp/magick-6240. Dimensions: 320 x 214 . Format: lossy. Now saving...
  Saved file /tmp/magick-6240

Looks like debug info, should such fprintf be disabled?

Anyway, maybe these messages are less relevant since now we have
image-converter:

> Emacs 27 can display these image formats if you have
>
> (setq image-use-external-converter t)
>
> But this bug report reminded me that we had agreed on defaulting these
> exotic image formats to `image-mode', so I've now done that (as well as
> fixing the UX of being unable to display images slightly).

Thanks.  I tried now to enable image-use-external-converter and visit
a webp image, but it signals an error:

  Cannot display image: (Searching for program No such file or directory gm)

I don't know what this 'gm' is, never used it.  I have only 'convert'
installed.  Is it supported by image-converter?

Message #18 received at 37972 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Juri Linkov <juri <at> linkov.net>
Cc: 37972 <at> debbugs.gnu.org,
 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Subject: Re: bug#37972: Emacs cannot deal with .webp suffix
Date: Wed, 30 Oct 2019 00:54:33 +0100

Juri Linkov <juri <at> linkov.net> writes:

> Thanks.  I tried now to enable image-use-external-converter and visit
> a webp image, but it signals an error:
>
>   Cannot display image: (Searching for program No such file or directory gm)
>
> I don't know what this 'gm' is, never used it.  I have only 'convert'
> installed.  Is it supported by image-converter?

Yup.  But it looks like there's an error in the detection machinery;
I'll investigate.

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

Message #21 received at 37972 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Juri Linkov <juri <at> linkov.net>
Cc: 37972 <at> debbugs.gnu.org,
 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Subject: Re: bug#37972: Emacs cannot deal with .webp suffix
Date: Wed, 30 Oct 2019 01:03:30 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Yup.  But it looks like there's an error in the detection machinery;
> I'll investigate.

This should now be fixed.

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

Message #24 received at 37972 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 37972 <at> debbugs.gnu.org,
 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Subject: Re: bug#37972: Emacs cannot deal with .webp suffix
Date: Wed, 30 Oct 2019 02:16:08 +0200

>> Yup.  But it looks like there's an error in the detection machinery;
>> I'll investigate.
>
> This should now be fixed.

Thanks, now finally it's possible to view webp images in Emacs without effort.

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