Commits on Feb 28, 2018

1. Correctly handle blend primitives, where the contents are clipped. …

   In some situations, the items within a filter stacking context will
   have clips applied. In this case, we minimize the allocated size
   of the intermediate surface, to avoid drawing redundant information
   that won't be seen.
   
   However, if the stacking context itself does not have the same clip
   applied, then we need to ensure that when we draw the blend primitive,
   we don't sample outside the smaller region of the intermediate
   surface that was rendered.
   
   Ideally, the stacking context should have a clip applied to it so
   that we don't waste time drawing transparent pixels. Adding a clip
   to the stacking context here would provide an optimization win in
   many cases. However, even without one present, we should still
   ensure correct rendering, thus this fix is required.
   
   Also fix a case where brush primitives with segments were not setting
   the correct bounding rect for a render task. This wasn't causing a
   problem here, but may have caused other issues.

   

   gw3583 committed Feb 28, 2018

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