forked from firka/flutter
e17aa1b63a
We need to compute whether a RenderObject has a composited descendant so that we can decide whether to use canvas.saveLayer or to create a new composited layer while walking down the tree during painting. The compositing update walks the tree from the root only to places where the tree's structure has been mutated. In the common case during an animation loop, we won't need to visit any render object beyond the root.