Benchmark for comparing safe and unsafe methods for setting a pixel in the golang image package.

imageset_test.go

package ImageSet

import (
	"image"
	"image/color"
	"testing"
)

const (
	DIM = 128
)

func BenchmarkSafeSet(b *testing.B) {
	img := image.NewGray(image.Rect(0,0,DIM,DIM))
	for i := 0; i < b.N; i++ {
		for x := 0; x < DIM; x++ {
			for y := 0; y < DIM; y++ {
				img.Set(x, y, color.Gray{128})
			}
		}
	}
}

func BenchmarkUnSafeSet(b *testing.B) {
	img := image.NewGray(image.Rect(0,0,DIM,DIM))
	for i := 0; i < b.N; i++ {
		for x := 0; x < DIM; x++ {
			for y := 0; y < DIM; y++ {
				img.Pix[img.PixOffset(x, y)] = uint8(128)
			}
		}
	}
}