If for some reason that’s not possible in revsg you can do it in image with:
"<svg> .....</svg>"
|> Image.from_svg!()
|> Image.write(conn)
Unfortunately the underlying vix isn’t supported on Windows so if that’s a requirement then this isn’t the solution for you. Also it uses librsvg as the svg renderer, not libresvg.
Is your input a svg file or a svg as a string ?
If it’s a svg as a string there is svg_string_to_png_buffer/2
I did not implement svg_to_png_buffer but it should be easy.
Unlike what I’ve written above, my data visualization library is currently using Resvg instead of Typst due to serious performance problems when I try to use Typst to render visualizations with > 1000 elements/datapoints.
Currently I’m generating SVG files, and I use Resvg (with the query_all function) to get text dimensions. And also to render SVGs into PNG.
However, one often wants to export SVG as PDF or at least to publish SVG files with embedded fonts so that rendering is reproducible.
I’ve thought of the following:
Would you include functionality to render SVG into PDF using the svg2pdf crate? Or do you think it is out of scope for your library?
Regarding the embedding of fonts… Does Resvg provide a way of querying the SVG file for the fonts that are actually used so that one knows which fonts to embed?
If this is considered out of scope for Resvg, would you like to add the relevant NIF functionality to my Quartz package? This later option would be quite convenient because I might want to add further rust libraries for more calculation-intensive tasks.
Hello thanks for your last contribution,
I don’t have much time to work on OSS this days I will maintain and review PR but that’s all.
In my current use case, the execution of NIFs for creating small images is instantaneous, which is ideal. However, this might pose a problem when rendering large and complex SVG which is more cpu intensive. Flagging them as DirtyCpu is probably what’s needed.
It’s worth noting that this is my first and only experience with Elixir NIFs, so I’m open to further insights 
doc
For complex Quartz plots (i.e. > 20,000 data points) rendering to PNG is definitely not instantaneous, but that is admittedly an unusual case…
Would you mind if I copied the resvg_code into my package so that I could tweak it for my use case? I agree with you that Resvg shouldn’t try to be too generic. I promise I won’t bother you with questions regarding the modified code. I understand if you don’t want slightly modified versions of your code in other projects, though.
Thanks to @tmbb’s PR, resvg v0.4.0 is out!
<tspan> inside <text> by upgrading underlying Rust libraries (resvg, usvg).