commit 507b1a44bd72830c136e6ecf7c05f9089796d572
author Nigel Tao <nigeltao@golang.org> Sun Nov 06 13:21:55 2016 +1100
committer Nigel Tao <nigeltao@golang.org> Tue Nov 15 01:09:02 2016 +0000
tree 6632520d3b24a9157d177785acf31c1f1f9985a1
parent 98f3e4e74d55d70d8a4af9d455b7ddc0ef59f6ca

vector: measure the fixed point rasterizer's accuracy.

When commit 8874bef1 changed ϕ from 10 to 9, this total diff grew from:
Total diff = 3051, n = 208, avg = 14.66827 out of 65535, or 0.02238%.
to:
Total diff = 6412, n = 208, avg = 30.82692 out of 65535, or 0.04704%.

Also fix a comment typo.

Change-Id: I91cc861a3d3ab282b5431cfb141fb010fd1f8d14
Reviewed-on: https://go-review.googlesource.com/32771
Reviewed-by: David Crawshaw <crawshaw@golang.org>