This function sets the "base file" of the handle to be base_file if
provided. SVG elements like <image> 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 gio.types.IOErrorEnum.Cancelled will be
returned in error.
Creates a new rsvg.handle.Handle for stream.
This function sets the "base file" of the handle to be base_file if provided. SVG elements like <image> 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 gio.types.IOErrorEnum.Cancelled will be returned in error.