SVG thumbnail generator: relative font-size: smaller/larger not handled (text disappear)
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	Relli054w
	Feb 6 2015, 8:23 PM

Description

Text inside <tspan></tspan> svg element does not painting when generating png files.

Demo:
https://commons.wikimedia.org/wiki/File:Voronoi_diagram_with_two_points.svg

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Status	Assigned	Task
Open	None	T43371 Thumbnail/imagescaler (tracking)
Resolved	TheDJ	T88833 SVG thumbnail generator: relative font-size: smaller/larger not handled (text disappear)
Resolved	hnowlan	T193352 Update librsvg to ≥2.42.3 (2.44.10)
Resolved	hnowlan	T216815 Upgrade Thumbor to Buster
Invalid	None	T212941 Investigate systemd hardening to replace Firejail for Thumbor
Resolved	fgiunchedi	T212946 Stream Thumbor logs to logstash
Resolved	• Gilles	T187765 Replace the Nginx fronting Thumbor with Haproxy
Resolved	fgiunchedi	T204266 Backport prometheus haproxy exporter for Jessie
Resolved	jijiki	T220499 Export useful metrics from haproxy logs for Thumbor
Resolved	jijiki	T221562 Build Thumbor packages for buster

Event Timeline

Relli054w created this task.Feb 6 2015, 8:23 PM

Relli054w raised the priority of this task from to Needs Triage.

Relli054w updated the task description. (Show Details)

Relli054w subscribed.

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFeb 6 2015, 8:23 PM

Aklapper renamed this task from MediaWiki thumbnail generator: svg->png: <tspan> not handled to Thumbnail generator: svg->png: <tspan> not handled.Feb 9 2015, 10:55 AM

Aklapper triaged this task as Lowest priority.

Aklapper added a project: Wikimedia-SVG-rendering.

Aklapper set Security to None.

Aklapper added a parent task: T43371: Thumbnail/imagescaler (tracking).

Perhelion renamed this task from Thumbnail generator: svg->png: <tspan> not handled to SVG thumbnail generator: font-size: smaller not handled.Apr 25 2015, 7:46 PM

I've analysed this file, it seems simply librsvg not support style="font-size: smaller" and font-size="smaller".

Looking at https://bugzilla.gnome.org/page.cgi?id=browse.html&product=librsvg I could not find a dedicated ticket - if this is an upstream issue, do you plan to upstream it?

If I get this correctly, it's not implemented in upstream, see:
https://git.gnome.org/browse/librsvg/tree/rsvg-css.c#n152
https://git.gnome.org/browse/librsvg/tree/rsvg-css.c#n200
https://git.gnome.org/browse/librsvg/tree/rsvg-css.c#n259

In T88833#1238198, @Aklapper wrote:

Looking at https://bugzilla.gnome.org/page.cgi?id=browse.html&product=librsvg I could not find a dedicated ticket - if this is an upstream issue, do you plan to upstream it?

Thats it, thanks for taking a look in the code (so I change the task desc.). And yes I'll do it. (It would be even less noticeable when the text would not entirely disappear.)

Perhelion renamed this task from SVG thumbnail generator: font-size: smaller not handled to SVG thumbnail generator: relative font-size: smaller/larger not handled (text disappear).Apr 27 2015, 6:46 PM

Perhelion updated the task description. (Show Details)

Perhelion added a project: Upstream.

jayvdb moved this task from Backlog to Reported Upstream on the Upstream board.Jul 21 2015, 5:36 AM

For anyone trying to reproduce this; the SVG linked in the task description has been changed to no longer use font-size="smaller", so it renders fine, but the underlying bug in librsvg is not addressed yet.