This function sets the "base file" of the handle to be @base_file if
provided. SVG elements like <literal><image></literal> which reference
external resources will be resolved relative to the location of @base_file.
If @cancellable is not %NULL, then the operation can be cancelled by
triggering the cancellable object from another thread. If the
operation was cancelled, the error %G_IO_ERROR_CANCELLED will be
returned in @error.
Creates a new #RsvgHandle for @stream.
This function sets the "base file" of the handle to be @base_file if provided. SVG elements like <literal><image></literal> which reference external resources will be resolved relative to the location of @base_file.
If @cancellable is not %NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error %G_IO_ERROR_CANCELLED will be returned in @error.