Commits on Aug 16, 2018

1. Simplify how local rects are accumulated for 3d contexts. …

   Pictures in a 3d rendering context are re-parented during
   flattening, to ensure correct ordering during plane splitting
   when un-transformed content is present.
   
   Previously, we determined the spatial node index based on
   the re-parented hierarchy, and this complicated local rect
   calculation for items inside a 3d rendering context. For
   these, we needed to retain the original spatial node index
   and do extra calculations.
   
   Now, we determine the correct spatial node index during
   flattening, and store it inside each primitive directly
   (rather than via the primitive runs inside a picture).
   
   This greatly simplifies the process of accumulating a
   local rect for a picture as we recurse through the
   picture tree - allowing pictures inside a 3d context
   to be processed just as any normal primitives are.
   
   This simplifies some upcoming work to rasterize pictures
   in local space, and is also a small optimization that
   reduces the number of local rects we need to build and
   transform.

   

   gw3583 committed Aug 16, 2018

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