librsvg bugs

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Wikimedia Commons currently uses librsvg 2.44.x 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.

librsvg-history on Wikimedia

version		live on Wikimedia
number	date	begin	end
2.3.93		–	2006
2.14.0		2006	at least 2007
2.40.16	2016-06	2016	2017
2.40.18	2017-07	2017	2019
2.40.20-3	2017-12	2019	2020
2.40.21	2020-02	2020	2023-05-16
2.42.0	2018-01
2.44.10	2018-12	2023-05-16
2.46.0	2019-09
2.48.0	2020-03
2.50.0	2020-09
2.52.0	2021-09

Rendering of text

• 
  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
• 
  Manfeild Autocourse track map (New Zealand).svg phab:T11420 (text with textPath not displayed)
• 
  Fort Hall Location Map.svg phab:T11420 (text with textPath not displayed)
• 
  T236398.svg phab:T236398 tspan text-decoration="overline" does not have overline

CSS inheritance

• 
  Test only.svg Applying CSS classes to SVG elements, all should look the same Bugzilla:41423

Filters

• 
  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

phab:T20936: This bug appears also in modern browsers on zooming levels.

White gap visible at odd px sizes (299px)

Same pic 1px larger rendered (300px)

An workaround can be the using of merge path.

• Merge Path tool (svgomg)
• Inkscape path merge

Pattern

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

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

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

Incomplete (please add missing ones e.g. from https://phabricator.wikimedia.org/tag/wikimedia-svg-rendering/)

Can be solved using svgworkaroundbot.toolforge.org

• phab:T35245 Multiple x-coordinates in text/tspan

No automatic solution available

• phab:T319377 The use element referencing another element via href attribute does not render (workaround: back to xlink:href attribute instead, and make sure the <svg> root tag have the xmlns:xlink="http://www.w3.org/1999/xlink" statement to make it works)

Solution not yet determined

• 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.