Reduce bandwidth to RPIs

PS1 refactors to make copying more explicit.

Change-Id: I35c3aecd10bbdb5ab2a462c72b062d979f48fce8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/246099
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Ben Wagner aka dogben <benjaminwagner@google.com>
62 files changed