Commits on Feb 18, 2018

1. Port radial gradient shader to be a brush primitive. …

   This is mostly a straightforward conversion, with a couple of
   interesting notes:
   
   * The previous radial gradient shader was missing a transform
     implementation so would never have worked properly with
     rotation and/or perspective.
   * We didn't (and still don't) detect if a radial gradient is
     opaque - it's always assumed transparent. So even though
     it can now opt in to segments (and save clip mask generation
     time), the inner segments will still be in the alpha pass.
     We should fix this!
   * Previously, we used to append the gradient stops directly
     after the primitive information in the main GPU cache handle.
     Now, there is a separate GPU cache handle for the stops. This
     is quite a bit more efficient in the GPU cache, since the
     size of the stops array is large, and a power of 2, it now
     fits exactly into a GPU cache slab, and allows the main
     primitive data to be allocated in a smaller row.

   

   gw3583 committed Feb 18, 2018

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