content-width

Up to now, I have had no problems with the background-image thumbnails in my theme. However, now that I’m trying to use an SVG as the featured image, something is breaking. The problem seems to related to the width of the SVGs being returned as zero by wp_get_attachment_image_src(). So what I am I trying to do is figure out how to extract the width and height information from the SVG then set them to the appropriate values in the SVGs database fields, isn’t proving easy.