Per-render image cache — keyed by src|color for string sources. Scoped to a single RootNode.render() call; discarded after rendering. Deduplicates concurrent fetches when multiple ImageNodes share the same src.
src|color
Per-render image cache — keyed by
src|colorfor string sources. Scoped to a single RootNode.render() call; discarded after rendering. Deduplicates concurrent fetches when multiple ImageNodes share the same src.