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[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5779 SVG: Per


From: Auto mailings of changes to Lily Issues via Testlilyissues-auto
Subject: [Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5779 SVG: Permit 'e' to appear in SVG font glyph paths
Date: Fri, 21 Feb 2020 10:51:55 -0000


[issues:#5779] SVG: Permit 'e' to appear in SVG font glyph paths

Status: Started
Created: Fri Feb 21, 2020 10:51 AM UTC by pkx166h
Last Updated: Fri Feb 21, 2020 10:51 AM UTC
Owner: pkx166h
Attachments:

On 20/02/2020 18:33, Simon Tatham wrote:

A user of my notation font Gonville reported to me this week that they
had tried to use the Lilypond SVG backend with Gonville, and had found
that everything worked fine except that the sharp signs were
mysteriously missing from the output.

I debugged the problem and found that this happened because Fontforge
had generated the SVG path string for that glyph in a way that happened
to include the floating-point literal "9.91821e-05", written in
scientific notation, and that the 'glyph-path-regexp' definition in
output-svg.scm was failing to match the path string as a result, because
it doesn't permit the letter 'e'.

I was able to work around the issue by editing my SVG font file to
re-express that number as 0.0000991821, without the 'e'. But as far as I
can see, scientific notation of that form is legal per the SVG spec:
https://www.w3.org/TR/2011/REC-SVG11-20110816/paths.html#PathDataBNF

Applying the attached patch against output-svg.scm also solved the
problem for me, and I think it's a better fix.

Cheers,
Simon


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