Update SkPicture cull rects with RTree information

When computed, the RTree for an SkPicture will have a root
bounds that reflects the best bounding information available,
rather than the best estimate at the time the picture recorder
is created. Given that creators frequently don't know ahead of
time what will be drawn, the RTree bound is often tighter.

Perf testing on Chrome indicates a small raster performance
advantage. For upcoming painting changes in Chrome the
performance advantage is much larger.

BUG=

Committed: https://skia.googlesource.com/skia/+/2dd3b6647dc726f36fd8774b3d0d2e83b493aeac

Review URL: https://codereview.chromium.org/971803002

1 files changed, 3 insertions, 0 deletions

diff --git a/src/core/SkBBoxHierarchy.h b/src/core/SkBBoxHierarchy.h
index f925a91940..1ea9e6bdb0 100644
--- a/src/core/SkBBoxHierarchy.h
+++ b/src/core/SkBBoxHierarchy.h
@@ -34,6 +34,9 @@ public:
 
     virtual size_t bytesUsed() const = 0;
 
+    // Get the root bound.
+    virtual SkRect getRootBound() const = 0;
+
     SK_DECLARE_INST_COUNT(SkBBoxHierarchy)
 private:
     typedef SkRefCnt INHERITED;