pub fn cache_key(
prim_uid: ItemUid,
transform: &QuadTransformState,
clip_chain: &ClipChainInstance,
clip_store: &ClipStore,
) -> Option<QuadCacheKey>pub fn cache_key(
prim_uid: ItemUid,
transform: &QuadTransformState,
clip_chain: &ClipChainInstance,
clip_store: &ClipStore,
) -> Option<QuadCacheKey>