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bug#35871: 27.0.50; [PATCH] Fix SVG transparency with Cairo

From: Kévin Le Gouguec
Subject: bug#35871: 27.0.50; [PATCH] Fix SVG transparency with Cairo
Date: Tue, 28 May 2019 12:02:34 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) 
YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> writes:

> Patch attached.
>
> It makes cairo image support more consistent with the Xlib one.  […]
> SVG images should look similar on both builds.

Just compiled master (c617b4bf1e50bf33f0016bbcd5f502cc88150f26)
--with-cairo and your patch on top; SVG images do seem to look the same
from where I'm standing:

Attachment: cairo-svg-fixed.png
Description: PNG image

> Alpha channel (not the tRNS chunk in PNG) support for PNG and SVG is
> now easy on cairo, but not added in this patch, because it introduces
> some inconsistency with the Xlib one.  It could be added as a separate
> change.

As far as this bug is concerned, I am fine with closing it when/if this
patch lands on master.
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