Get the size of a subelement of the SVG file. Do not call from within the size_func callback, because an infinite loop will occur.
A place to store the SVG's size
An element's id within the SVG, or %NULL to get the dimension of the whole SVG. For example, if you have a layer called "layer1" for that you want to get the dimension, pass "#layer1" as the id.
2.22
See Implementation
Get the size of a subelement of the SVG file. Do not call from within the size_func callback, because an infinite loop will occur.