use getColor4f() in raster pipeline blitter

Change-Id: I08ac2bfc05efcd16c57e1782287d44eec7a63606
Reviewed-on: https://skia-review.googlesource.com/153642
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed