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Before librsvg 2.46, applications would normally load an SVG asset, then they would query librsvg for the SVG's size, and then they would compute the dimensions of their user interface based on the SVG's size.
With librsvg 2.46 and later, applications may have an easier
time by letting the UI choose whatever size it wants, or by
hardcoding a size for SVG assets, and then asking librsvg to
render SVG assets at that particular size. Applications can use
rsvg_handle_render_document, which takes
a destination viewport, to do this in a single step.
To extract individual elements from an SVG document and render
them in arbitrary locations — for example, to extract a single
icon from a document full of icons —, applications can use
rsvg_handle_render_element.
It is sometimes convenient for applications to inject an extra
stylesheet while rendering an SVG document. You can do this
with rsvg_handle_set_stylesheet. During
the CSS cascade, the specified stylesheet will be used with a
"User"
origin.