pub fn start(
functions: &[fn(p: &mut Pipeline<'_, '_>)],
functions_tail: &[fn(p: &mut Pipeline<'_, '_>)],
rect: &ScreenIntRect,
aa_mask_ctx: AAMaskCtx,
mask_ctx: MaskCtx<'_>,
ctx: &mut Context,
pixmap_src: PixmapRef<'_>,
pixmap_dst: &mut SubPixmapMut<'_>,
)