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bug#4367: 23.1; unable to view this png image

From: Xah Lee
Subject: bug#4367: 23.1; unable to view this png image
Date: Mon, 14 Sep 2009 12:30:11 -0700

Hi Eli & other GNU Emacs developers,

perhaps this is controversial... but doesn't FSF people want GNU Emacs to be working out of the box on Windows?

it is trivial to include the dll libs for images.

The other recent bug is about ftp not working out of the box on GNU Emacs binary for Windows downloaded from FSF site, whereas Lennart's EmacsW32 distribution includes a Open source ftp binary that fixed the problem.

I feel that it would be great for all features of emacs work out of the box as much as possible for platforms that are supported by FSF.

Since FSF does develope a version of emacs that works for Windows... i don't understand if there is a reason to not include these DLLs?

The only reason i can think of is that perhaps FSF prefer emacs to be work well for GNU/Linux and does not take extra steps to make it work as well for “non-free” Windows. If this is the reason to not include image library DLLs for Windows, i feel this perhaps damaging to the spread of FSF philosophy, since many Windows people who tries emacs and just find it not working in many situations. For example, Visual Basic and PHP today are perhaps the most used languages if one count the pencentage of number of programers for these langs.

btw, I should mention this message is just meant to address this image dll issue pertaining this bug report, not meant to argue about philosophy or best approach to FSF philosophy. I feel that a binary version of Emacs for Windows downloaded from FSF's official site and not able to open image files is something like a show-stopper bug.


∑ http://xahlee.org/
----- Original Message ----- From: "Eli Zaretskii" <address@hidden>
To: "Xah Lee" <address@hidden>; <address@hidden>
Cc: <address@hidden>
Sent: Wednesday, September 09, 2009 9:13 AM
Subject: Re: bug#4367: 23.1; unable to view this png image

From: "Xah Lee" <address@hidden>
Date: Tue, 8 Sep 2009 20:32:37 -0700
Cc: address@hidden

Not sure what you mean updating libpng, since this is on Windows, i presume
any png lib is included in emacs...

No, they are not.  The only image library shipped with the precompiled
binary distribution is libXpm, because without it you don't have the
color icons on the toolbar buttons.  The other image libraries need to
be installed separately.

or, humm... does this mean if i don't
have libpng program installed separated on Windows then emacs won't open
image files?

You won't be able to see PNG image files in Emacs, yes.  And libpng is
a DLL, not a program.

See the value of image-library-alist for the possible image libraries
Emacs supports for each image type.  You need to have at least one
installed for each type, to be able to visit images of that type

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