as specified by [rsvg.handle.Handle.setSizeCallback].
Handle.width
int width() @propertyGet width property.
Returns
Width, in pixels, of the rendered SVG after calling the size callback
Deprecated
For historical reasons, this property is of integer type,
which cannot give the exact size of SVG images that are not pixel-aligned. Moreover, reading each of the size properties causes the size of the SVG to be recomputed, so reading both the width and height properties will cause two such computations. Please use [rsvg.handle.Handle.getIntrinsicDimensions] instead.