Commits on Nov 19, 2017

1. Make all render task data structs contain a common base field. …

   Some render tasks can have a source task of different kinds. The
   most common example is that the source task to a blur task can
   be any of (a) a picture (b) an alpha task (c) a downscaling task.
   
   To ensure this works correctly, we separate render task data into
   a common base, followed by a small amount of task-specific data.
   
   The blur tasks now only fetch the common task data, which is all
   that they require.
   
   This fixes a bug (that I don't think is actually occurring in any
   tests), and is also prep work for the next step. Now that everything
   is using Picture internally, we can remove the AlphaBatchTask
   completely. This will allow us to start converting more primitives
   over to use a smaller subset of brush shaders, which will alow us
   to start doing the primitive segmentation and also get better
   batching results.

   

   gw3583 committed Nov 19, 2017
   f17b7cc

2. Remove AlphaBatchTask, and introduce start of raster mode. …

   Most of the difficult work related to this was done in the
   large picture PR that landed previously.
   
   This removes the remnants of AlphaBatch tasks, and makes them
   all run through Picture render tasks.
   
   This also introduces the first part of the picture and shader
   side support for selecting whether primitives on a given picture
   are to be rasterized in screen space or a local space.

   

   gw3583 committed Nov 19, 2017

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