RectMask2D は、Mask と同様にマスク制御を行います。Mask は親要素の短径に対する子要素を制限します。標準のマスク制御とは違って、いくつかの制限がありますが、パフォーマンス上の利点も多く持っています。
RectMask2D は一般的に、大きな画像領域中の小さな領域を表示するのに使います。この領域を枠として表示するため RectMask2D を適用します。
RectMask2D 制御による制限
RectMask2D の利点は
RectMask2D
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