use from/to_srgb only when known to be in [0,1]
Our srgb_roundtrip_extended unit test has shown that our from_srgb and
to_srgb stages start to break down outside a range of about [-2,2], and
they appear to asymptote to roundtripping to y=8, not an identity y=x.
We'll continue to use these stages where we know ahead of time that
the inputs are all in [0,1], and otherwise fall back on ::parametric.
Guarded by SK_LEGACY_SRGB_STAGE_CHOICE.
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I046b2d37a629df9b0ea687f8df6cad864110430f
Reviewed-on: https://skia-review.googlesource.com/c/165766
Commit-Queue: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
9 files changed