SVG rasterizer, png not as expected

[andre2007]

I really do not have much knowledge about SVG. I write a D binding for Verovio (https://github.com/rism-digital/verovio) which is able to create Midi & SVG file for a given MusicXML file.

I attached the sample SVG file. sample_svg.zip

In the webbrowser it is rendered like this:

When I use svg.d the PNG looks like this:

I used this coding and the svg.d from master:

  NSVG* image = nsvgParseFromFile("sample.svg", "px", 96);
    int w = 2000;
    int h = 4000;

    NSVGrasterizer rast = nsvgCreateRasterizer();
    auto img = new TrueColorImage(w, h);
    rasterize(rast, image, 0, 0, 1, img.imageData.bytes.ptr, w, h, w*4);
    image.kill();
    writePng("test.png", img);

Is there an error on my side or is maybe s.th. missing in svg.d?

[adamdruppe]

I think here it might just be that the background color is different.... ill try it soon.

[adamdruppe]

eh changing the bg color didn't matter, it might also be the symbol id references it uses, that looks incomplete here, and the <symbol> i don't see any implementation for that at all... yeah and if i delete that, the firefox result looks similar.

So that's the problem, <symbol> isn't implemented here.

[adamdruppe]

The <use> thing also isn't implemented.

By a quick glance a the spec, symbol is basically a mini-embedded svg you can refer to time and time again with use to paste it in multiple times. But implementing this in the mess of ported C code prolly not easy.

[adamdruppe]

It also doesn't support <text> or <tspan> which are also used here.

It has extremely minimal css support so that might also prove to be a limitation but i don't think that'd be very important in this case (biggest effect would be using normal font instead of italic and bold).

Each of these is doable to fix but a pain given that this is essentially C code.

[adamdruppe]

....you know one potentially easy answer here is to preprocess it. it'd be tricky to get the viewBox working right with that though. eh prolly not gonna work that easily.

[andre2007]

Thanks a lot Adam that you have analyzed it. I will check wheter I can pre process if as suggested by you. Thanks.