GNU bug report logs - #59944
Transparency with alpha-background doesn't work well with PNG images on Emacs 29.0.60

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From: Po Lu <luangruo <at> yahoo.com>
To: Satya Prakash Dahal <be2020se701 <at> gces.edu.np>
Cc: 59944 <at> debbugs.gnu.org
Subject: bug#59944: Transparency with alpha-background doesn't work well with PNG images on Emacs 29.0.60
Date: Mon, 12 Dec 2022 10:59:35 +0800

Satya Prakash Dahal <be2020se701 <at> gces.edu.np> writes:

> PNG images with a transparent background are not transparent. 
> Look at the image emacs_png_bug.png on the attachment.
> This is my first bug report. If I am missing something please let me know.
> Below are the commands i used to compile the emacs.
>
> git clone https://github.com/emacs-mirror/emacs.git
> cd emacs
> ./autogen.sh
> ./configure
> ./configure --with-mailutils && make
> make install

Well, does anyone want to fix this?

It should be "as simple" as making libpng use the same code in
x_query_frame_color to allocate transparent colors.  But I have no idea
how to make libpng do that.

In the meantime, you can use XPM images for that icon instead, which are
free from this problem.

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