* bug#8324: Emacs 23.3 for W32 and libpng: update documentation
@ 2011-03-22 23:27 pglpm0
2011-03-23 4:07 ` Eli Zaretskii
0 siblings, 1 reply; 3+ messages in thread
From: pglpm0 @ 2011-03-22 23:27 UTC (permalink / raw)
To: 8324
Hey good people,
I had some problems visualizing png images with the new
Emacs 23.3, MSwindows port. Eventually I discovered that the
'image-library-alist' has changed from v23.2: it now
requires libpng14 instead of libpng12. I was using the
latter from Gnuwin32. After getting libpng14 from GTK+
everything works fine.
The 'bug' is this: please update the README file to warn
about these changes, I found no mentions of them in the
updated documentation.
Thanks everybody for a beautiful new emacs release!
PGL
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#8324: Emacs 23.3 for W32 and libpng: update documentation
2011-03-22 23:27 bug#8324: Emacs 23.3 for W32 and libpng: update documentation pglpm0
@ 2011-03-23 4:07 ` Eli Zaretskii
[not found] ` <4D897457.5000804@gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Eli Zaretskii @ 2011-03-23 4:07 UTC (permalink / raw)
To: pglpm0; +Cc: 8324
> Date: Tue, 22 Mar 2011 19:27:54 -0400
> From: pglpm0@gmail.com
> Cc:
>
> I had some problems visualizing png images with the new
> Emacs 23.3, MSwindows port. Eventually I discovered that the
> 'image-library-alist' has changed from v23.2: it now
> requires libpng14 instead of libpng12. I was using the
> latter from Gnuwin32. After getting libpng14 from GTK+
> everything works fine.
>
> The 'bug' is this: please update the README file to warn
> about these changes, I found no mentions of them in the
> updated documentation.
It is mentioned in nt/INSTALL and in README.W32, see below. Please
tell how to make it more visible than that, and please see how did you
miss that.
INSTALL:
For PNG images, we recommend to use versions 1.4.x and later of
libpng, because previous versions had security issues. You can find
precompiled libraries and headers on the GTK download page for
Windows (http://www.gtk.org/download-windows.html).
Versions 1.4.0 and later of libpng are binary incompatible with
earlier versions, so Emacs will only look for libpng libraries which
are compatible with the version it was compiled against. That
version is given by the value of the Lisp variable `libpng-version';
e.g., 10403 means version 1.4.3. The variable `image-library-alist'
is automatically set to name only those DLL names that are known to
be compatible with the version given by `libpng-version'. If PNG
support does not work for you even though you have the support DLL
installed, check the name of the installed DLL against
`image-library-alist' and the value of `libpng-version', and
download compatible DLLs if needed.
README.W32:
PNG: requires the PNG reference library 1.4 or later, which will
be named libpng14.dll or libpng14-14.dll. LibPNG requires zlib,
which should come from the same source as you got libpng.
Starting with Emacs 23.3, the precompiled Emacs binaries are
built with libpng 1.4.x and later, and are incompatible with
earlier versions of libpng DLLs. So if you have libpng 1.2.x,
the PNG support will not work, and you will have to download
newer versions.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2011-03-22 23:27 bug#8324: Emacs 23.3 for W32 and libpng: update documentation pglpm0
2011-03-23 4:07 ` Eli Zaretskii
[not found] ` <4D897457.5000804@gmail.com>
2011-03-23 18:16 ` Eli Zaretskii
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