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bug#36315: 27.0.50; SVG transparency handling is inaccurate
From: |
YAMAMOTO Mitsuharu |
Subject: |
bug#36315: 27.0.50; SVG transparency handling is inaccurate |
Date: |
Mon, 24 Jun 2019 16:56:45 +0900 |
User-agent: |
Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (Gojō) APEL/10.8 EasyPG/1.0.0 Emacs/25.3 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) |
On Fri, 21 Jun 2019 05:26:53 +0900,
Pip Cet wrote:
>
> [1 <text/plain; UTF-8 (7bit)>]
> Evaluate the following in emacs -Q:
>
> (require 'svg)
>
> (defun make-image (color)
> (let ((svg (svg-create 100 100)))
> (svg-rectangle svg 0 0 100 100 :fill color)
> (svg-image svg)))
>
> (set-frame-parameter (window-frame) 'background-color "black")
>
> (insert (propertize " " 'display (make-image "#f00000")))
>
> The expected result is a rectangle (on black background) of color
> #f00000. The actual result is a rectangle of color #ef0000. For black
> backgrounds, white is no longer representable.
>
> This is related to bug #36304, but much easier to fix.
>
> Patch attached.
An alternative way would be to use rsvg_handle_render_cairo, which is
recommended by librsvg, and let it blend with the background color.
Patch attached. Note that this does not require --with-cairo.
Raising the required version of librsvg to 2.14 is not a problem, as
we are already using rsvg_handle_get_dimensions that requires that
version. Is Windows librsvg DLL compiled with libcairo?
YAMAMOTO Mitsuharu
mituharu@math.s.chiba-u.ac.jp
svg-cairo.diff
Description: Binary data
- bug#36315: 27.0.50; SVG transparency handling is inaccurate, Pip Cet, 2019/06/20
- bug#36315: 27.0.50; SVG transparency handling is inaccurate, Pip Cet, 2019/06/20
- bug#36315: 27.0.50; SVG transparency handling is inaccurate,
YAMAMOTO Mitsuharu <=
- bug#36315: 27.0.50; SVG transparency handling is inaccurate, YAMAMOTO Mitsuharu, 2019/06/24
- bug#36315: 27.0.50; SVG transparency handling is inaccurate, Eli Zaretskii, 2019/06/24
- bug#36315: 27.0.50; SVG transparency handling is inaccurate, YAMAMOTO Mitsuharu, 2019/06/25
- bug#36315: 27.0.50; SVG transparency handling is inaccurate, Lars Ingebrigtsen, 2019/06/25
- bug#36315: 27.0.50; SVG transparency handling is inaccurate, Eli Zaretskii, 2019/06/26