add an invert stage for inverse CMYK -> CMYK

This will be faster, but maybe more importantly it helps make debugging
a stack trace clearer.  It's confusing to see a "parametric transfer
function" stages followed by a table transfer function stages...

This leads to a little bit of cleanup in SkColorSpaceXform_A2B.

I am uncertain whether we still need parametric_a.  I need to do some
more tracing through the code before I'd say it's impossible to reach in
addTransferFn().

Change-Id: I52e85019f92d012a3086fc94cf64ae6c9307ea94
Reviewed-on: https://skia-review.googlesource.com/32040
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

0 files changed, 0 insertions, 0 deletions