GNU bug report logs - #37153
26.1; some png images scrambled on Windows

Previous Next

Full log

Message #71 received at 37153 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>,
 Roland Winkler <winkler <at> gnu.org>
Cc: 37153 <at> debbugs.gnu.org
Subject: Re: bug#37153: 26.1; some png images scrambled
Date: Sun, 25 Aug 2019 11:38:07 -0700

[Message part 1 (text/plain, inline)]

YAMAMOTO Mitsuharu wrote:

> It seems to be necessary to look into the tRNS chunk data for paletted
> images.  Again, W32 would need some more work.

Thanks, I confirmed that this fixes the misdisplay for me as well. I attempted 
to port it to w32 (as well as to unusual libpng builds that do not define 
PNG_tRNS_SUPPORTED) and installed the attached into master.

With this patch on Ubuntu 18.04.3 I always see the first image shown in your 
tRNS.pg screenshot <https://bugs.gnu.org/37153#56>. So it may be that more work 
needs to be done to support other faces. Still, this patch is an improvement so 
it's worth going in.

[0001-Fix-misdisplay-of-PNG-paletted-images.patch (text/x-patch, attachment)]

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.