GNU bug report logs - #7716
23.2.91; Pretest Windows binary doesn't support PNG images

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Packages: emacs, w32;

Reported by: Eli Zaretskii <eliz <at> gnu.org>

Date: Thu, 23 Dec 2010 05:58:02 UTC

Severity: normal

Found in version 23.2.91

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: sean.sieger <at> gmail.com, 7716 <at> debbugs.gnu.org
Subject: bug#7716: 23.2.91; Pretest Windows binary doesn't support PNG images
Date: Tue, 11 Jan 2011 20:45:02 +0200

> From: "Drew Adams" <drew.adams <at> oracle.com>
> Cc: <sean.sieger <at> gmail.com>, <7716 <at> debbugs.gnu.org>
> Date: Mon, 10 Jan 2011 20:41:26 -0800
> 
> > > PNG is still not displayed in the latest Windows build I have:
> > > GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600) of 2011-01-03 on 3249CTO
> > 
> > What's the value of the variable libpng-version,
> 
> libpng-version's value is 10403
> Documentation:
> Not documented as a variable.
> 
> > and what version of libpng do you have installed?
> 
> How would I know? Looking at Properties > Version for each of these files:
> 
> libpng3.dll,  File version: 1.2.37.3442
> libpng12.dll, File version: 1.2.37.3442
> libpng13.dll, File version: 1.2.8.1799

This is version 1.2.x of libpng, while libpng-version's value, 10403,
means that Emacs looks for version 1.4.3 or later.  If you evaluate
`(image-type-available-p 'png)', you should see nil.

You need to download a newer version of libpng.

> > These two need to match; see README.W32
> > in the distro, under "Image libraries".
> 
> There is no "Image libraries" in README.W32.

Sorry, it was 6AM outside and cold, so my brain didn't warm up yet.

> Where does that leave us?  The only LibPng setup file I see at GNUWin32 is
> 1.2.37: http://gnuwin32.sourceforge.net/packages/libpng.htm
> (libpng-1.2.37-setup.exe).

You will find libpng 1.4.x here:

  http://www.gtk.org/download-windows.html

With this newer version, PNG support should work.  You may need to
restart Emacs, though (but I'm not sure, so try without first).
This bug report was last modified 14 years and 130 days ago.

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