GNU bug report logs - #48415
Subject: 27.2; Add filter-to-png support for user defined image formats

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

From: Dov Grobgeld <dov.grobgeld <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Subject: 27.2;
 Add filter-to-png support for user defined image formats
Date: Fri, 14 May 2021 12:07:07 +0300

--
This is a feature request and not a bug.

Background

Within org-mode I often reference external image resources of
hand drawn sketches that were drawn with the program krita. These
have the extension kra.  Internally this file format is a zip
file, with one of the entries being the image mergedimage.png . I
would like to display such kra images in emacs inline, just like
emacs can display any referenced png files.

Another similar format is the OpenRaster file format (which is
also a zip file with an embedded mergedimage.png), which by
default has the extension .ora.

Suggestion

I suggest that the inline image display in emacs will
be "extended" with a list of "filter functions" that map from a
user define file extension- to a function that extracts and
produces a png file. With such support it becomes trivial to
support inline display of kra and ora files by writing a function
that extracts the mergedimage.png from the zip file and supplies
it to emacs.

--


In GNU Emacs 27.2 (build 1, x86_64-redhat-linux-gnu, GTK+ Version
3.24.27, cairo version 1.17.4)
 of 2021-03-27 built on buildvm-x86-25.iad2.fedoraproject.org
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Fedora 34 (Workstation Edition)

Recent messages:

Configured using:
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Message #8 received at 48415 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Dov Grobgeld <dov.grobgeld <at> gmail.com>
Cc: 48415 <at> debbugs.gnu.org
Subject: Re: bug#48415: Subject: 27.2; Add filter-to-png support for user
 defined image formats
Date: Sun, 31 Oct 2021 08:04:55 -0700

Dov Grobgeld <dov.grobgeld <at> gmail.com> writes:

> This is a feature request and not a bug.
>
> Background
>
> Within org-mode I often reference external image resources of
> hand drawn sketches that were drawn with the program krita. These
> have the extension kra.  Internally this file format is a zip
> file, with one of the entries being the image mergedimage.png . I
> would like to display such kra images in emacs inline, just like
> emacs can display any referenced png files.
>
> Another similar format is the OpenRaster file format (which is
> also a zip file with an embedded mergedimage.png), which by
> default has the extension .ora.
>
> Suggestion
>
> I suggest that the inline image display in emacs will
> be "extended" with a list of "filter functions" that map from a
> user define file extension- to a function that extracts and
> produces a png file. With such support it becomes trivial to
> support inline display of kra and ora files by writing a function
> that extracts the mergedimage.png from the zip file and supplies
> it to emacs.

Thanks for the bug report.

Could you send an example .kra image file and .ora image file?

Message #11 received at 48415 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Dov Grobgeld <dov.grobgeld <at> gmail.com>
Cc: 48415 <at> debbugs.gnu.org
Subject: Re: bug#48415: Subject: 27.2; Add filter-to-png support for user
 defined image formats
Date: Wed, 13 Jul 2022 01:37:39 +0200

Dov Grobgeld <dov.grobgeld <at> gmail.com> writes:

> I suggest that the inline image display in emacs will
> be "extended" with a list of "filter functions" that map from a
> user define file extension- to a function that extracts and
> produces a png file. 

I've now added support for this in Emacs 29 via
`image-converter-add-handler'.

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

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