Commits on Apr 15, 2018

1. Add basic infrastructure for caching Pictures, enable for some blurs. …

   Adds the basic infrastructure for caching the outputs of a
   rasterized Picture in the texture cache.
   
   For now, this only applies if the following conditions are met:
    * The picture has a blur filter on it (includes text-shadows).
    * The contents of the picture and clips are in the root
      coordinate system (no rotations / perspective etc).
   
   This covers most real-world use cases of blurs and text-shadows.
   
   Future work:
    * Expand to cache other Picture types (e.g. drop-shadows, other filters).
    * Support caching of complex coordinate system pictures which
      are not animating (and thus worth caching).
    * Support deep comparison of picture elements between display lists.
      (caching only applies during scrolling in this first pass).

   

   gw3583 committed Apr 15, 2018

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