Commits on Dec 23, 2015

1. Partially fix blur filters. …

   * Blur filters do not need a temporary framebuffer. (Nor do any other
     filters.)
   
   * We now write the texture sizes into the mask UV coordinates properly.
   
   * We allow composite filters to inflate the dimensions of their render
     targets. This means that blurs can draw outside their rects.
   
   Remaining issues:
   
   * Blur filters need to not read outside of the render target in the
     atlas.
   
   * The vertical blur needs to blur the render target that the horizontal
     blur wrote to rather than the original render target.

   

   pcwalton committed Dec 23, 2015
   54d86b4