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my result is below.
goos: linux
goarch: amd64
pkg: test
cpu: AMD Ryzen 7 3700X 8-Core Processor
BenchmarkMyCrop-16 14307 79645 ns/op
BenchmarkResizeCrop-16 134 8771603 ns/op
my test code is below.
const size = 50
func BenchmarkMyCrop(b
5F05
*testing.B) {
f, err := ioutil.ReadFile("img.png")
if err != nil {
panic(err)
}
dImage, _, err := image.Decode(bytes.NewReader(f))
if err != nil {
panic(err)
}
rect := image.Rect(0, 0, size, size)
SubImage := func (img image.Image, r image.Rectangle) image.Image {
var bgSize = image.Rect(0, 0, r.Dx(), r.Dy())
var bg = image.NewNRGBA(bgSize)
draw.Draw(bg, bg.Bounds(), img, r.Min, draw.Src)
return bg
}
for i := 0; i < b.N; i++ {
SubImage(dImage, rect)
}
}
func BenchmarkResizeCrop(b *testing.B) {
f, err := ioutil.ReadFile("img.png")
if err != nil {
panic(err)
}
dImage, _, err := image.Decode(bytes.NewReader(f))
if err != nil {
panic(err)
}
rect := image.Rect(0, 0, size, size)
for i := 0; i < b.N; i++ {
transform.Crop(dImage, rect)
}
}my test image is below.
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