nanosvg run against w3.org test suite

[kristianlm]

What an amazing accomplishment, @memononen! I'm looking forward to experiment with embedded SVG-files in my prototype games instead of PNGs.

I made your example2.c into something that can be used from the command-line (see this issue), and I ran it across all the svg sample files from w2.org like this:

$ gcc -lm example2.c -o nsvg -I ../src
$ find -name "*.svg" | while read F ; do ./nsvg "$F" ; done

I was really surprised how accurate NanoSvg really was! Among the 204 examples, I found just a couple of problems:

• Text won't render but we knew that (and I fear a proper implementation of this would make NanoSVG not be so nano anymore?)
• ubuntu.svg is completely blank:
• yinyang.svg is missing a dot and has a strange curve:
• tiger.svg is 800px tall, but it looks like it should be 510px

Apart from those, they all render beautifully!

I don't have time to investigate, but I though I'd mention these minor problems just in case. Keep up the good work!

[kristianlm]

I missed one!

svg.svg doesn't look like a star:

Probably because of xlink:href. Leaving just for reference. I don't know how important supporting this would be for the use-case of prototype game icons.

[memononen]

Thanks for checking those out!

• Embdedded text should be doable, loading font files doable too, but more involved
• Looks like ubuntu.svg does not work because it is using use/xref tag (i.e. symbols), which is not currently supported by nanosvg
• yinyang.svg probably has some problems how the arcs are handles, the math for arcs is nasty, have to check it out
• tiger.svg has height="800" set in the header

Another set I have been thinking of checking is http://game-icons.net/

[X-Ryl669]

YingYang is fixed by code in #88. I'm creating a PR for it.