Commits on Apr 30, 2018

1. Allow subpixel with specified background color in offscreen targets. …

   When a subpixel text run has a specified background color, we can
   safely draw it into an off-screen surface.
   
   Fix a bug in the renderer where the shader color mode was being
   set before the shader was bound.
   
   Add support in wrench for specifying the background color of
   a text run.
   
   Add a reftest that checks offscreen surface + bg color subpixel
   text is the same as subpixel text on a normal background.
   
   Fixes #2670.

   

   gw3583 committed Apr 30, 2018

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