tree 9c3cfeccf765c2f7c64411ce1930ea13cd8e9228
parent 41f747b91e95d310c535bc259aac3a1a242ad910
author Nigel Tao <nigeltao@golang.org> 1427077831 +1100
committer Nigel Tao <nigeltao@golang.org> 1427150867 +0000

draw: eliminate some math.Floor calls in Transform methods.

benchmark                      old ns/op     new ns/op     delta
BenchmarkTformNNSrcRGBA        524533        293230        -44.10%
BenchmarkTformNNSrcUniform     362974        149389        -58.84%
BenchmarkTformABSrcGray        827461        427720        -48.31%
BenchmarkTformABSrcNRGBA       1286930       919391        -28.56%
BenchmarkTformABSrcRGBA        1115444       794334        -28.79%
BenchmarkTformABSrcYCbCr       1732420       1379846       -20.35%
BenchmarkTformCRSrcGray        3629048       3467404       -4.45%
BenchmarkTformCRSrcNRGBA       7569407       7418874       -1.99%
BenchmarkTformCRSrcRGBA        7552459       7432745       -1.59%
BenchmarkTformCRSrcYCbCr       8072351       7854715       -2.70%

Change-Id: I6c01e631d9f88c36ae99d0cd181104ad5ac48db0
Reviewed-on: https://go-review.googlesource.com/7926
Reviewed-by: Rob Pike <r@golang.org>