gtk:icon-paintable-is-symbolic (object)

object -- a gtk:icon-paintable object
symbolic -- true if the icon is symbolic, false otherwise

The accessor for the is-symbolic slot of the gtk:icon-paintable class checks if the icon is symbolic or not. This currently uses only the file name and not the file contents for determining this. This behaviour may change in the future.

Note that to render a symbolic gtk:icon-paintable object properly, with recoloring, you have to set its icon name on a gtk:image widget.