Commits on Nov 28, 2017

1. Fix some redundant cases of clip mask generation. …

   There are two fixes here:
    * Image pictures were generating clip masks, but they are never
      actually used. In the future, we *might* want to support this,
      but at the moment it just results in clip masks that are then
      never used.
    * If a primitive is in the root coordinate system, then we know
      that it is axis-aligned, and that there are no coordinate
      system changes in between this primitive and the root. In that
      case, we can infer that the local_clip_rect of the clip scroll
      node will correctly handle the screen space clip rect.
   
   In Gecko with the current WR code, I was seeing a lot of very large
   clip masks being generated (4x extra A8 render targets) on HN. The
   test case included here is a very reduced test case for these issues.
   
   The test case makes use of the new reftest annotations to assert
   that no alpha targets get allocated while rendering the yaml file.

   

   gw3583 committed Nov 28, 2017

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