liyuqian 397c02b215 Allow raster caching any layer subtree (flutter/engine#6442) ...

We first test this with OpacityLayer. This test alone (without retained rendering) should have ~30% speedup as we'll have fewer render target switches by snapshoting in the Preroll instead of saveLayer in the Paint.

In my local flutter_gallery transition perf tests, the average frame time drops from ~16ms to ~12ms.

https://github.com/flutter/flutter/issues/21756

2018-10-11 13:24:33 -07:00

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src/flutter

Allow raster caching any layer subtree (flutter/engine#6442)

2018-10-11 13:24:33 -07:00