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

[Basil L. Contovounesios]

YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> writes:

> On Tue, 28 May 2019 19:02:34 +0900,
> Kévin Le Gouguec wrote:
>> 
>> 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:
>
> Thanks for testing.  Pushed to master as c89900ebd79.  Closing.

Thanks for working on this!  Unfortunately this commit seems to have
broken native image scaling, at least on X:

0. emacs -Q
1. C-x C-f /path/to/image.png RET
   [Notice the image isn't scaled to the window size.]
2. Any combination of + and -
   [Notice the image is not scaled.]

Reverting c89900ebd79 brings back scaling for me.
Here is my build info:

In GNU Emacs 27.0.50 (build 4, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll 
bars)
 of 2019-05-29 built on thunk
Repository revision: 7f3b0d1c0003f3b883a6df3d2fae7f847f6d3070
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12003000
System Description: Debian GNU/Linux 10 (buster)

Configured using:
 'configure 'CC=ccache gcc' 'CFLAGS=-O2 -march=native' --config-cache
 --prefix=/home/blc/.local --with-mailutils --with-x-toolkit=lucid
 --with-modules --with-file-notification=yes --with-x'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON
PDUMPER LCMS2 GMP

Should I file a new bug report for this?

Thanks,

-- 
Basil