support generalized HLG
Same basic deal as skcms.
This new GM tests our treatment of color spaces as sources is consistent
with our treatment of color spaces as destinations. It looks good to me
now, and I have tested that this GM catches a "well-placed typo" in each
of the three implementations modified here.
Bug: chromium:1144260
Change-Id: I3eabc93bbd65855c60006751f68c171ccdce9d94
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/351336
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
6 files changed