* bug#50904: TODO: Deprecate and remove XPM icons (replacing them with PPM)
@ 2021-09-29 21:47 Stefan Kangas
2021-09-30 6:55 ` Lars Ingebrigtsen
0 siblings, 1 reply; 6+ messages in thread
From: Stefan Kangas @ 2021-09-29 21:47 UTC (permalink / raw)
To: 50904
Severity: wishlist
In etc/TODO we have the following item:
** Deprecate and remove XPM icons
Convert the XPM bitmaps to PPM, replace the PBMs with them and scrap
the XPMs so that the color versions work generally. (Requires care
with the color used for the transparent regions.)
Here's what I've gathered so far, posting it here to save someone else
the trouble:
PPM (Portable PixelMap) is the color version of PBM (Portable BitMap)
and has as good support.[1] XPM is an older format.
There are previous discussions on emacs-devel, but I have only been able
to track some of them down. The TODO itself dates back to February 2003
(bf6394a6bed2).
I have tried to convert the images with netpbm using this:
cd etc/images
xpmtoppm --alphaout=attach.alpha attach.xpm | \
pnmcomp -alpha=attach.alpha - > attach.ppm
pnmcomp: bad magic number 0x0 - not a PAM, PPM, PGM, or PBM file
But then I don't get any further.
I have also tried with the newer pamcomp (that replaces pnmcomp):
cd etc/images
xpmtoppm --alphaout=attach.alpha attach.xpm | \
pamcomp attach.alpha - atach.ppm
That just leads to an image that looks wrong.
With GraphicsMagick, I used "gc convert attach.xpm attach.ppm" but the
results looked all wrong.
With GIMP it seems like I can produce images that preserve the alpha
channels correctly, but perhaps not in all cases. It also seems like
different files produce different results, maybe? But on balance,
perhaps a combination of GIMP and GraphicsMagick would be best.
---
Be aware that Debian has an old forked version of netpbm from 2002, so
if you want to use xpmtoppm, you need to install netpbm from
SourceForge. Luckily, there are .deb packages available (as well as
source tarballs).
Footnotes:
[1] https://lists.gnu.org/r/emacs-devel/2002-09/msg00949.html
^ permalink raw reply [flat|nested] 6+ messages in thread* bug#50904: TODO: Deprecate and remove XPM icons (replacing them with PPM)
2021-09-29 21:47 bug#50904: TODO: Deprecate and remove XPM icons (replacing them with PPM) Stefan Kangas
@ 2021-09-30 6:55 ` Lars Ingebrigtsen
2021-09-30 9:28 ` Eli Zaretskii
0 siblings, 1 reply; 6+ messages in thread
From: Lars Ingebrigtsen @ 2021-09-30 6:55 UTC (permalink / raw)
To: Stefan Kangas; +Cc: 50904
Stefan Kangas <stefan@marxist.se> writes:
> In etc/TODO we have the following item:
>
> ** Deprecate and remove XPM icons
> Convert the XPM bitmaps to PPM, replace the PBMs with them and scrap
> the XPMs so that the color versions work generally. (Requires care
> with the color used for the transparent regions.)
There doesn't seem to be any bug reports about XPM colours not working
correctly -- what are the symptoms?
XPMs are attractive in that they allow addressing colours by name, and
you can therefore alter them on-the-fly without editing the images.
(See `gnus-logo-color-alist' for something that exploits this.) You can
do the same with SVG images, but then you need SVG support. And you
can't do this with PPMs, I think.
So I'm not sure I agree with that TODO item, unless I'm missing
something (which I may well be).
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#50904: TODO: Deprecate and remove XPM icons (replacing them with PPM)
2021-09-30 6:55 ` Lars Ingebrigtsen
@ 2021-09-30 9:28 ` Eli Zaretskii
2021-10-01 11:08 ` Stefan Kangas
0 siblings, 1 reply; 6+ messages in thread
From: Eli Zaretskii @ 2021-09-30 9:28 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: stefan, 50904
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Thu, 30 Sep 2021 08:55:39 +0200
> Cc: 50904@debbugs.gnu.org
>
> There doesn't seem to be any bug reports about XPM colours not working
> correctly -- what are the symptoms?
>
> XPMs are attractive in that they allow addressing colours by name, and
> you can therefore alter them on-the-fly without editing the images.
> (See `gnus-logo-color-alist' for something that exploits this.) You can
> do the same with SVG images, but then you need SVG support. And you
> can't do this with PPMs, I think.
>
> So I'm not sure I agree with that TODO item, unless I'm missing
> something (which I may well be).
I agree. It sounds like this item is outdated, and we should delete
it.
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#50904: TODO: Deprecate and remove XPM icons (replacing them with PPM)
2021-09-30 9:28 ` Eli Zaretskii
@ 2021-10-01 11:08 ` Stefan Kangas
2021-10-01 11:17 ` Eli Zaretskii
0 siblings, 1 reply; 6+ messages in thread
From: Stefan Kangas @ 2021-10-01 11:08 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 50904-done, Lars Ingebrigtsen
Eli Zaretskii <eliz@gnu.org> writes:
> > So I'm not sure I agree with that TODO item, unless I'm missing
> > something (which I may well be).
>
> I agree. It sounds like this item is outdated, and we should delete
> it.
Ugh, I wasted over 2 hours on this...
I've now removed this from etc/TODO (commit f733b909ff), and I'm
closing this bug.
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#50904: TODO: Deprecate and remove XPM icons (replacing them with PPM)
2021-10-01 11:08 ` Stefan Kangas
@ 2021-10-01 11:17 ` Eli Zaretskii
2021-10-01 11:30 ` Lars Ingebrigtsen
0 siblings, 1 reply; 6+ messages in thread
From: Eli Zaretskii @ 2021-10-01 11:17 UTC (permalink / raw)
To: Stefan Kangas; +Cc: 50904-done, larsi
> From: Stefan Kangas <stefan@marxist.se>
> Date: Fri, 1 Oct 2021 13:08:42 +0200
> Cc: Lars Ingebrigtsen <larsi@gnus.org>, 50904-done@debbugs.gnu.org
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> > > So I'm not sure I agree with that TODO item, unless I'm missing
> > > something (which I may well be).
> >
> > I agree. It sounds like this item is outdated, and we should delete
> > it.
>
> Ugh, I wasted over 2 hours on this...
Sorry about that, and thanks for taking care of those forgotten items.
> I've now removed this from etc/TODO (commit f733b909ff), and I'm
> closing this bug.
Thanks.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-10-01 11:30 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2021-09-29 21:47 bug#50904: TODO: Deprecate and remove XPM icons (replacing them with PPM) Stefan Kangas
2021-09-30 6:55 ` Lars Ingebrigtsen
2021-09-30 9:28 ` Eli Zaretskii
2021-10-01 11:08 ` Stefan Kangas
2021-10-01 11:17 ` Eli Zaretskii
2021-10-01 11:30 ` Lars Ingebrigtsen
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