tree 412075f46b2ffdf58348ff8cd0e5dd4990b3fc08
parent 97bfcc9529c9dcaaf72ac421e79f55ffd6a58d3e
author Brian Osman <brianosman@google.com> 1589901832 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1589910075 +0000

Guard exp2f_ to never return a negative value

Certain inputs could end up returning -NaN. That would then be used as
input to eval later, and the sign-stripping wouldn't work correctly, so
we'd pass -NaN to powf_, triggering the assert.

Mathematically, exp2f_ should never return a negative value, so clamp
any underflow result to 0.

Bug: chromium:996795
Change-Id: I39072265eb2e3239590c9928df3b68cd0bfa83a3
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/290767
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>