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是否可以在 Cocoa/CocosSharp 中创建遮罩层？我在找这里，但找不到。我也用谷歌搜索了这个，但没有运气。
我想做的是创建带有很多孔的矩形。
像这样的东西： http ://www.photoshopessentials.com/photo-effects/placing-an-image-inside-another-with-photoshop-cs6/
感谢帮助