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package golibjpegturbo
import (
"bytes"
"fmt"
"image"
"image/draw"
"image/jpeg"
"io/ioutil"
"log"
"os"
"os/exec"
"testing"
)
const (
// a random 683x1024 441kb image
localFileName = "test.jpg"
saveResized = false
)
var (
imgData []byte
imgGray []byte
imgCmyk []byte
decodedImg image.Image
encodedImg []byte
)
func init() {
d, err := ioutil.ReadFile(localFileName)
if err != nil {
log.Fatalf("ReadFile() failed with %q\n", err)
}
imgData = d
r := bytes.NewReader(d)
decodedImg, err = Decode(r)
if err != nil {
log.Fatalf("Decode() failed with %q\n", err)
}
if !convertExists() {
return
}
imgGray = convertAndLoad("gray")
imgCmyk = convertAndLoad("cmyk")
}
// treats any error (e.g. lack of access due to permissions) as non-existence
func PathExists(path string) bool {
_, err := os.Stat(path)
return err == nil
}
func panicIfErr(err error) {
if err != nil {
panic(err.Error())
}
}
// see if ImageMagick's convert utility exists
func convertExists() bool {
cmd := exec.Command("convert", "-version")
if err := cmd.Run(); err != nil {
return false
}
return true
}
// convert test.jpeg to a given colorspace and load the data using ImageMagick's
// convert utility
func convertAndLoad(colorSpace string) []byte {
tmpPath := "tmp-" + colorSpace + ".jpeg"
cmd := exec.Command("convert", "test.jpg", "-colorspace", colorSpace, tmpPath)
err := cmd.Run()
panicIfErr(err)
d, err := ioutil.ReadFile(tmpPath)
panicIfErr(err)
err = os.Remove(tmpPath)
panicIfErr(err)
return d
}
func ImageToRgba(img image.Image) *image.RGBA {
switch v := img.(type) {
case *image.RGBA:
return v
}
// all other images we convert to RGBA because rez only supports YCbCr and RGBA
// and there are weird restrictions on YCbCr width/height that are not met by
// many YCbCr images
r := img.Bounds()
r = image.Rect(0, 0, r.Dx(), r.Dy())
newImg := image.NewRGBA(r)
draw.Draw(newImg, r, img, image.Point{}, draw.Src)
return newImg
}
// not every image type has SubImage
func SubImage(img image.Image, r image.Rectangle) image.Image {
// fast path for types we expect to encounter in real life
switch v := img.(type) {
case *image.RGBA:
return v.SubImage(r)
case *image.Gray:
return v.SubImage(r)
case *image.Paletted:
return v.SubImage(r)
case *image.NRGBA:
return v.SubImage(r)
case *image.Gray16:
return v.SubImage(r)
case *image.YCbCr:
return v.SubImage(r)
}
// slow path for everything else
img2 := ImageToRgba(img)
return img2.SubImage(r)
}
func saveEncoded(t *testing.T, img image.Image, path string) {
if !saveResized {
return
}
fout, err := os.Create(path)
if err != nil {
t.Fatal(err)
}
defer fout.Close()
if err := Encode(fout, img, nil); err != nil {
t.Fatal(err)
}
}
func reencodeData(t *testing.T, imgData []byte, cs string) {
var r image.Rectangle
var img2 image.Image
fin := bytes.NewBuffer(imgData)
img, err := Decode(fin)
if err != nil {
t.Fatal(err)
}
saveEncoded(t, img, fmt.Sprintf("test_reencoded%s.jpg", cs))
// test bounds (0, 0, dx/2, dy/2)
r = img.Bounds()
r.Max.X = r.Max.X / 2
r.Max.Y = r.Max.Y / 2
img2 = SubImage(img, r)
saveEncoded(t, img2, fmt.Sprintf("test_reencoded%s_0.jpg", cs))
// test bounds (dx/2, 0, dx, dy/2)
r = img.Bounds()
r.Min.X = r.Max.X / 2
r.Max.Y = r.Max.Y / 2
img2 = SubImage(img, r)
saveEncoded(t, img2, fmt.Sprintf("test_reencoded%s_1.jpg", cs))
// test bounds (0, dy/2, dx/2, dy)
r = img.Bounds()
r.Max.X = r.Max.X / 2
r.Min.Y = r.Max.Y / 2
img2 = SubImage(img, r)
saveEncoded(t, img2, fmt.Sprintf("test_reencoded%s_2.jpg", cs))
// test bounds (dx/2, dy/2, dx, dy)
r = img.Bounds()
r.Min.X = r.Max.X / 2
r.Min.Y = r.Max.Y / 2
img2 = SubImage(img, r)
saveEncoded(t, img2, fmt.Sprintf("test_reencoded%s_3.jpg", cs))
// test taking half from center
r = img.Bounds()
dx := r.Dx()
dy := r.Dy()
r.Min.X = dx / 4
r.Max.X = r.Min.X + dx/2
r.Min.Y = dy / 4
r.Max.Y = r.Min.Y + dy/2
img2 = SubImage(img, r)
saveEncoded(t, img2, fmt.Sprintf("test_reencoded%s_4.jpg", cs))
// test bounds taking 1 px from each side
r = img.Bounds()
r.Min.X = 1
r.Min.Y = 1
r.Max.X--
r.Max.Y--
img2 = SubImage(img, r)
saveEncoded(t, img2, fmt.Sprintf("test_reencoded%s_5.jpg", cs))
}
func TestReencode(t *testing.T) {
reencodeData(t, imgData, "")
if len(imgGray) > 0 {
reencodeData(t, imgGray, "_gray")
}
if len(imgCmyk) > 0 {
reencodeData(t, imgGray, "_cmyk")
}
}
func BenchmarkDecode(b *testing.B) {
var err error
for n := 0; n < b.N; n++ {
r := bytes.NewBuffer(imgData)
decodedImg, err = Decode(r)
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkDecodeGo(b *testing.B) {
var err error
for n := 0; n < b.N; n++ {
r := bytes.NewBuffer(imgData)
decodedImg, err = jpeg.Decode(r)
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkEncode(b *testing.B) {
var err error
options := &Options{Quality: 90}
var buf bytes.Buffer
for n := 0; n < b.N; n++ {
buf.Reset()
err = Encode(&buf, decodedImg, options)
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkEncodeGo(b *testing.B) {
var err error
options := &jpeg.Options{Quality: 90}
var buf bytes.Buffer
for n := 0; n < b.N; n++ {
buf.Reset()
err = jpeg.Encode(&buf, decodedImg, options)
if err != nil {
b.Fatal(err)
}
}
}
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