HTML labels containing images and their locations

[esnible]

Maybe this is a documentation quest, or maybe it is an enhancement request.

I have a web server that uses goccy/go-graphviz to render several different graphs to SVG.

GraphViz.Render() needs to read the images on the HTML labels to learn their size, and also preserve the image URLs so the browser can also fetch them.

As far as I can see, GraphViz.Render() is using the current working directory and opening the file. I would like to be able to customize the way Render() looks up the images, so that the rendering isn't tied to the filesystem. I'd like to supply GraphViz with a callback for image file data and metadata retrieval. Is this currently possible?

Example

mynode [ label=<<TABLE BORDER="0"><TR><TD><IMG SRC="./static/icons/pod-128.png" /></TD></TR><TR><TD>Pod</TD></TR></TABLE>> ]