Function webrender::prepare::add_composite_prim

fn add_composite_prim(
    prim_instance_index: PrimitiveInstanceIndex,
    rect: LayoutRect,
    color: PremultipliedColorF,
    quad_flags: QuadFlags,
    frame_state: &mut FrameBuildingState<'_>,
    targets: &[CommandBufferIndex],
    segments: &[QuadSegment]
)