tree 28cb9dbdc430844c78962b12d64353d3d82f77c6
parent 7634330c98356548cacd63e805688d20579fd1f5
author Mike Klein <mtklein@chromium.org> 1500657097 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1500659244 +0000

when encoding PNG, don't assume F16 values are in range

I believe this will fix this batch of broken colorImages:

   https://gold.skia.org/search?blame=e23e55ef33358b2f6f98fc9cb795c71397c01618&fdiffmax=-1&fref=false&frgbamax=255&frgbamin=0&head=true&include=false&limit=50&match=gamma_correct&match=name&metric=combined&neg=false&offset=0&pos=false&query=source_type%3DcolorImage&sort=desc&unt=true

Depending on the instruction set, clamping to logical [0,1] may be
implicit or not as we work our way down to bytes.  I think that's why
these broken images are not more widespread on the bots.

Change-Id: Ie9bb937864bf6954301d76d9921a2d3029d12c9a
Reviewed-on: https://skia-review.googlesource.com/25742
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>