tree 2b1c51c6f38fe7ff034f35814e1faee9500189a4
parent 2a40e8dacf5ce048a67b89ffe4ed4a0181e8befb
author Nigel Tao <nigeltao@golang.org> 1425032807 +1100
committer Nigel Tao <nigeltao@golang.org> 1425086879 +0000

draw: RGBA src fast path for scaling.

benchmark                     old ns/op      new ns/op      delta
BenchmarkScaleSrcRGBA         15124800       2091946        -86.17%

Change-Id: Id8d3088793ebf1d75b929fcf6945987817e87463
Reviewed-on: https://go-review.googlesource.com/6234
Reviewed-by: Rob Pike <r@golang.org>