Function webrender::clip::compute_box_shadow_parameters

fn compute_box_shadow_parameters(
    shadow_rect_fract_offset: LayoutPoint,
    shadow_rect_size: LayoutSize,
    shadow_radius: BorderRadius,
    prim_shadow_rect: LayoutRect,
    blur_radius: f32,
    clip_mode: BoxShadowClipMode
) -> BoxShadowClipSource