Function prepare_clip_task 

pub fn prepare_clip_task(
    clip_instance: &ClipNodeInstance,
    clip_item: &ClipItem,
    task_rect: &DeviceRect,
    prim_local_coverage_rect: &LayoutRect,
    prim_spatial_node_index: SpatialNodeIndex,
    raster_spatial_node_index: SpatialNodeIndex,
    device_pixel_scale: DevicePixelScale,
    clip_store: &ClipStore,
    spatial_tree: &SpatialTree,
    gpu_buffer: &mut GpuBufferBuilderImpl<GpuBufferBlockF>,
    transforms: &mut TransformPalette,
    rg_builder: &mut RenderTaskGraphBuilder,
    sub_tasks: &mut SubTaskRange,
)