Android 绘图视图组中的损坏区域是多少

What is the damaged area in Drawing View Group in Android

我正在浏览开发者控制台并阅读有关 Drawing

的内容

Drawing is handled by walking the tree and recording the drawing commands of any View that needs to update. After this, the drawing commands of the entire tree are issued to screen, clipped to the newly damaged area.

我不太理解"the newly damaged area"这个词。 有人可以详细说明吗? 谢谢

这里的damaged area是指失效区域,需要更新像素。