tree 1fe2cb71ecb4936bfe816839c4c61b504d20e62c
parent 575b1002760e48a944ef0970edaa4bbf6d11c5c3
author Nigel Tao <nigeltao@golang.org> 1427188600 +1100
committer Nigel Tao <nigeltao@golang.org> 1427317331 +0000

draw: optimize some multiply-by-zeroes in Kernel.Transform.

benchmark                      old ns/op     new ns/op     delta
BenchmarkTformCRSrcGray        5096041       4820642       -5.40%
BenchmarkTformCRSrcNRGBA       10476578      8414331       -19.68%
BenchmarkTformCRSrcRGBA        10361135      7954413       -23.23%
BenchmarkTformCRSrcYCbCr       11952218      9824899       -17.80%

Change-Id: I8b4cfe68ecae85e447ae65ceecf185261445a8a2
Reviewed-on: https://go-review.googlesource.com/7991
Reviewed-by: Rob Pike <r@golang.org>