Re: Can we refactor output-svg.scm to avoid regexp?

[Étienne Beaulé]

Svg-woff is not only broken with that old bug, but also that SVG fonts are 
deprecated. The hope is that the work on SMUFL done this summer could be used 
in the SVG backend, and with that, embedding musical symbols directly could be 
avoided to reduce regex use.

Étienne

> Le 28 oct. 2020 à 22:27, K.L. <k.l.lambda@gmail.com> a écrit :
> 
> Hello guys.
> 
> I ran a profiling for SVG backend engraving, I saw the most time cost
> (95%+) is taken by regexp execution.
> 
> It seems the usage of regexps in output-svg.scm is to extract vector font
> content fragments from font svg assets. Can we refactor this work by an XML
> parser, maybe in C++?
> 
> I saw there is another alternate option, svg-woff. But I encountered the
> scm error:
> 
>> output-svg.scm:448:16: Unbound variable: paper
>> 
> 
> It seems an unresolved old bug for some years after googling it.
> 
> This may be the biggest performance bottleneck of SVG backend at present,
> once fixed, we will get huge improvement.
> 
> Any ideas?
> 
> [image: image.png]
> [image: image.png]
> <image.png><image.png>