Commits on Aug 10, 2018

1. Embed the PicturePrimitive inside BrushPrimitive. …

   Remove the cpu_pictures array and store the PicturePrimitive
   directly inside the BrushPrimitive.
   
   The rationale here is to move the prim store arrays to be stored
   and owned by each PicturePrimitive. This is an interim step
   towards that - it's a bit messy in places due to borrow check
   issues, but should be a lot tidier once complete.
   
   The benefit of doing this is that as we start to cache Pictures
   more aggressively, we can retain the PicturePrimitive struct
   from a previous frame, and easily compare the embedded primitive
   runs to see if we have a cache hit.
   
   This will make it possible to cache Picture primitives between
   *display lists* rather than just scroll frames where appropriate,
   by doing a deep compare on the primitive runs in a picture.

   

   gw3583 committed Aug 10, 2018

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