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>
7 files changed