librsvg bugs
This requires updating because: librsvg got updated In doing so, you could add a timestamp to the .
|
Wikimedia Commons currently uses librsvg 2.44.x[1] for rendering images. It's a fast renderer compared to Inkscape or batik, but it can be buggy at times. There is a discussion about updating to a newer version on phab:T265549 or on re-evaluating the svg-renderer on phab:T40010.
Some files may be fixed now. If there are any files that were uploaded earlier and have an error in displaying, you can try Purging the file to force a re-render. You should check all the resolutions, since the bugs can show up differently in different resolutions.
If you see a buggy image, tag it with {{Rsvg bug}}. This puts it in Category:Pictures showing a librsvg bug. Some more bugs are reported at Commons:Commons SVG Checker#Checks.
version | live on Wikimedia | ||
---|---|---|---|
number | date[2] | begin | end |
2.3.93[3] | – | 2006[4] | |
2.14.0[4] | 2006[4] | at least 2007[5] | |
2.40.16[6] | 2016-06 | 2016[6] | 2017[7] |
2.40.18[7] | 2017-07 | 2017[7] | 2019[8] |
2.40.20-3[9] | 2017-12 | 2019[8] | 2020[10] |
2.40.21[11] | 2020-02 | 2020[10] | 2023-05-16[1] |
2.42.0 | 2018-01 | ||
2.44.10[1] | 2018-12 | 2023-05-16[1] | |
2.46.0 | 2019-09 | ||
2.48.0 | 2020-03 | ||
2.50.0 | 2020-09 | ||
2.52.0 | 2021-09 |
Rendering of text edit
-
Text-positioning.svg Multiple x-/y-/dx-/dy-coordinates positioning text characters Bugzilla:33245
-
Text-positioning fixed.svg Correct positioning (solution to achieve the fix is in the image description)
-
MediaWiki SVG fonts.svg Pure font scaling, especially Times, Courier, (Helvetica is fixed now) you can identify this by a large thumb
-
Series-RL.svg Italics does not appear in thumbnail, even though the font variant is correctly specified Bugzilla:41425
-
Series-RL BugSolved.svg Valid SVG, rendered correctly
CSS inheritance edit
-
Test only.svg Applying CSS classes to SVG elements, all should look the same Bugzilla:41423
Filters edit
-
Librsvg bug feconvolvematrix.svg Demonstration of Rsvg not rendering elements with a filter using feConvolveMatrix e.g. to sharpen low-resolution embedded images
Hairline cracks edit
phab:T20936: This bug appears also in modern browsers on zooming levels.
An workaround can be the using of merge path.
Pattern edit
phab:T20463: The libRSVG's handling of SVG pattern is only rudimentary. Some fixed examples (bug in file history):
-
Only on small thumbnail size
Marker edit
The presentation of markers is in different viewers implemented differently. The origin point varies. Inkscape shows the boundaries incorrectly.
-
Wiki commons
-
Opera
-
Inkscape
Code of 3) use the translate attribute.
<circle id="circle3" transform="translate(20, 20)" stroke="rgb(0%, 70%, 0%)" cx="0" cy="0" r="20"/>
<marker id="marker3" refX="20" refY="20" viewBox="0 0 40 40"
markerUnits="userSpaceOnUse" markerWidth="40" markerHeight="40">
<use xlink:href="#circle3"/>
</marker>
<line x1="130" x2="270" y1="180" y2="180" marker-start="url(#marker3)" marker-end="url(#marker3)"/>
</svg>
Note that orient="auto-start-reverse" is not implemented in SVG 1.1.
Embedded bitmaps edit
The first uploads of File:Solar_system_bodies_rotation_animation.svg and File:Cambridge_Kings_Ditch_map.svg gave blank thumbnails as width and height parameters of the image tag were omitted, though they rendered fine on Firefox and Chrome.
List of open Phab SVG bugs edit
Incomplete (please add missing ones e.g. from https://phabricator.wikimedia.org/tag/wikimedia-svg-rendering/)
Can be solved using svgworkaroundbot.toolforge.org edit
- phab:T35245 Multiple x-coordinates in text/tspan
No automatic solution available edit
- phab:T319377 The
use
element referencing another element viahref
attribute does not render (workaround: back toxlink:href
attribute instead, and make sure the<svg>
root tag have thexmlns:xlink="http://www.w3.org/1999/xlink"
statement to make it works)
Solution not yet determined edit
- phab:T261192 Rendering multilingual (systemLanguage) SVG files fails after upgrading librsvg from 2.40.21 to 2.44.10 possibly due to the
LANG
environment variable not controlling the language preference - phab:T265549 Update librsvg to > 2.44.10. Several librsvg issues are not fixed in 2.44.10 (Debian Buster), but are in later versions. Debian Bullseye (testing) is currently shipping 2.50.1.
References edit
- ↑ a b c d phab:T193352
- ↑ https://gitlab.gnome.org/GNOME/librsvg/-/tags?page=5&sort=updated_desc
- ↑ User:Brion Vibber (WMF) on phab:T6976#94122
- ↑ a b c User:Brion Vibber (WMF) on phab:T6976#94135
- ↑ phab:T12207
- ↑ a b User:Kaldari on phab:T65703#2434426
- ↑ a b c mw:User:MMuhlenhoff (WMF) on phab:T170810#3679484
- ↑ a b User:JoKalliauer on phab:T68672#5109579
- ↑ User:EMouzeli (WMF) on phab:T68672#5110846
- ↑ a b User:JoKalliauer on phab:T276684
- ↑ https://gitlab.gnome.org/GNOME/librsvg/-/issues/725#note_1105591