commit 415cb3b42079180a675c08f3ee13b6d8813ceb97
author Nigel Tao <nigeltao@golang.org> Fri Mar 20 10:14:03 2015 +1100
committer Nigel Tao <nigeltao@golang.org> Fri Mar 20 00:55:56 2015 +0000
tree 4f2e499e9a776e4bc65a73a6cd54a34fad47fed4
parent c62001d39ba355ad24588ecae27cfce07399a74a

draw: add Scale and Transform fast paths for YCbCr src images.

benchmark                      old ns/op      new ns/op     delta
BenchmarkScaleLargeDownNN      3239565        1044458       -67.76%
BenchmarkScaleLargeDownAB      12162059       3205972       -73.64%
BenchmarkScaleLargeDownBL      1437923310     358229213     -75.09%
BenchmarkScaleLargeDownCR      2844139449     651228380     -77.10%
BenchmarkScaleSrcYCbCr         12413692       3176042       -74.42%
BenchmarkTformABSrcYCbCr       8363947        2163052       -74.14%
BenchmarkTformCRSrcYCbCr       49944171       11652821      -76.67%

Change-Id: I8cd5ab20aa1f516114599690cab037441a328aec
Reviewed-on: https://go-review.googlesource.com/7796
Reviewed-by: Rob Pike <r@golang.org>