I am doing profiling for several Apps on b2g, and have found near 1x% ~ 20% of CPU time when scrolling are spent on building display list. So, I think we can use cache for display lists to save time of creating the same display items repeatedly.
I just have done some studies, and have a rough idea. My idea is attaching the caches with frames. When a frame is MarkIntrinsicWidthsDirty()ed, the attached cache is deleted if any. For the frames that their parents are MarkIntrinsicWidthsDirty()ed for last reflowing, but not themself, the results of their BuildDisplayList() are kept in the cache. I guess most animation will modify the same set of subtrees repeatedly. So, we can save time for building display lists. Feedback is welcomed! -- Sinker -- 天教懶漫帶疏狂 _______________________________________________ dev-tech-layout mailing list [email protected] https://lists.mozilla.org/listinfo/dev-tech-layout
