tree 4c9dd90004f5d6694fb79eb5faf38d5be44bbc08
parent b30d4812c76e7094c471ea3f2b07c1cf99786936
author Mike Klein <mtklein@google.com> 1573244286 -0600
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1573248487 +0000

use round() instead of trunc() to f32->unorm

This does open us up to a little bit of possible inconsistency of
rounding when right on a x.5 (sometimes we'll +0.5 and trunc, sometimes
round to nearest, sometimes round according to the default mode which is
usually round to nearest) but I think that inconsistency may be worth
the free register not needing a splat(0.5f) buys us.

A few invisible diffs.

Change-Id: I9af092c937ccf7c5891c2ab3cb298d217e4a9e9f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/253725
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Reed <reed@google.com>