gbr- has been brg- this whole time...

Rewrite things to make that a little clearer.

A red pixel ends up in channel 2, what would naively draw as blue
without a rotation.  A green pixel ends up in channel 0, which would
naively draw as red without rotation.  A blue pixel ends up in channel
1, which would naively draw as green without this rotation.

So this transformation is:

   r -> b
   g -> r
   b -> g

i.e. rgb_to_brg

Change-Id: I12331ff2622194e34a44f421f656fbe4db5d3dca
Reviewed-on: https://skia-review.googlesource.com/65521
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
13 files changed