Function draw_plan 

pub(crate) fn draw_plan<'a>(
    plan: &OutlinePlan<'a>,
    context: &'a dyn OutlineContext<'a>,
    options: &DrawOptions,
    precision: Precision,
    buf: &mut [u8],
    sink: &mut dyn PathSink,
) -> Result<DrawnMetrics, Error>

Loads plan into buf with the given options and precision, and draws it into sink.