与遮罩相关的 Utility 类。
此类提供特定于遮罩的实用函数。
| FindRootSortOverrideCanvas | 查找根 Canvas。 |
| GetRectMaskForClippable | 查找指定 IClippable 的正确 RectMask2D。 |
| GetRectMasksForClip | 搜索应用于指定 RectMask2D 的所有 RectMask2D（包括自身）。 |
| GetStencilDepth | 查找指定元素的模板深度。 |
| IsDescendantOrSelf | Helper 函数，用于确定子项是父项的后代还是父项。 |
| Notify2DMaskStateChanged | 通知指定组件下的所有 IClippable，它们需要重新计算裁剪。 |
| NotifyStencilStateChanged | 通知指定组件下的所有 IMaskable，它们需要重新计算遮罩。 |
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