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:
 'configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
 --with-gpm=no --with-xwidgets --with-modules --with-harfbuzz
 --with-cairo --with-json build_alias=x86_64-redhat-linux-gnu
 host_alias=x86_64-redhat-linux-gnu CC=gcc 'CFLAGS=-DMAIL_USE_LOCKF -O2
 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches
 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
 -Wp,-D_GLIBCXX_ASSERTIONS
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
 -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
 LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD JSON PDUMPER GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  xmsi-mode: t
  show-paren-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-magit-file-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  shell-dirtrack-mode: t
  async-bytecomp-package-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:

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helm-source eieio-compat helm-multi-match helm-lib wdired web-mode
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url-auth url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-domsuf url-util mailcap magit-popup format-spec
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multi-tty make-network-process emacs)

Memory information:
((conses 16 1625465 106870)
 (symbols 48 64815 5)
 (strings 32 244674 9774)
 (string-bytes 1 8227842)
 (vectors 16 70177)
 (vector-slots 8 1728176 257632)
 (floats 8 536 239)
 (intervals 56 31987 664)
 (buffers 1000 36))

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