Function flo_render_canvas::render_canvas_offscreen

pub fn render_canvas_offscreen<'a, DrawStream, RenderContext>(
    context: &'a mut RenderContext, 
    width: usize, 
    height: usize, 
    scale: f32, 
    actions: DrawStream
) -> impl 'a + Future<Output = Vec<u8>> where
    DrawStream: 'a + Stream<Item = Draw>,
    RenderContext: 'a + OffscreenRenderContext, 

Renders a canvas in an offscreen context, returning the resulting bitmap