commit dea0340cadb759932e53416a657f5ea75fee8b5f
author msarett <msarett@google.com> Thu Jun 16 10:50:55 2016 -0700
committer Commit bot <commit-bot@chromium.org> Thu Jun 16 10:50:55 2016 -0700
tree f3c7e4c1873771ee818e0a1c86515a3ea5250d75
parent bd770d619553a88eeaa64ff29082f62db5c9b4d2

Implement fast, correct gamma conversion for color xforms

201295.jpg on HP z620
(300x280, most common form of sRGB profile)

QCMS Xform                    0.495 ms
Skia Old Xform                0.235 ms
Skia NEW Xform                0.423 ms

Vs Old Code                   0.56x
Vs QCMS                       1.17x

So to summarize, we are now much slower than before,
but still a bit faster than QCMS.  And now we are also
far more accurate than QCMS :).

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2060823003
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Review-Url: https://codereview.chromium.org/2060823003