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bug#37153: 26.1; some png images scrambled

From: Paul Eggert
Subject: bug#37153: 26.1; some png images scrambled
Date: Sun, 25 Aug 2019 11:38:07 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

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.

Attachment: 0001-Fix-misdisplay-of-PNG-paletted-images.patch
Description: Text Data

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