/
image.go
354 lines (304 loc) · 7.93 KB
/
image.go
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package imageprocessor
import (
"bytes"
"errors"
"image"
"image/color"
"image/draw"
"image/gif"
"image/jpeg"
"image/png"
"io"
"math"
"os"
"sync"
"github.com/BurntSushi/graphics-go/graphics"
"github.com/BurntSushi/graphics-go/graphics/interp"
"github.com/chai2010/webp"
"github.com/ieee0824/libcmyk"
imgproxyerr "github.com/livesense-inc/fanlin/lib/error"
"github.com/nfnt/resize"
"github.com/rwcarlsen/goexif/exif"
_ "golang.org/x/image/bmp"
)
var affines map[int]graphics.Affine = map[int]graphics.Affine{
1: graphics.I,
2: graphics.I.Scale(-1, 1),
3: graphics.I.Scale(-1, -1),
4: graphics.I.Scale(1, -1),
5: graphics.I.Rotate(toRadian(90)).Scale(-1, 1),
6: graphics.I.Rotate(toRadian(90)),
7: graphics.I.Rotate(toRadian(-90)).Scale(-1, 1),
8: graphics.I.Rotate(toRadian(-90)),
}
var mlConverterCache = &sync.Map{}
type Image struct {
img image.Image
format string
}
func (i *Image) ConvertColor(networkPath string) error {
sc := i.img.At(0, 0)
_, ok := sc.(color.CMYK)
if !ok {
return nil
}
rect := i.img.Bounds()
ret := image.NewRGBA(rect)
var converter *libcmyk.Converter
iface, ok := mlConverterCache.Load(networkPath)
if !ok {
cr, err := libcmyk.New(networkPath)
if err != nil {
return err
}
mlConverterCache.Store(networkPath, cr)
converter = cr
} else {
converter = iface.(*libcmyk.Converter)
}
w := rect.Max.X
h := rect.Max.Y
for y := 0; y < h; y++ {
for x := 0; x < w; x++ {
cmyk := i.img.At(x, y).(color.CMYK)
rgba, err := converter.CMYK2RGBA(&cmyk)
if err != nil {
return err
}
ret.Set(x, y, rgba)
}
}
i.img = ret
return nil
}
func max(v uint, max uint) uint {
if v > max {
return max
}
return v
}
func EncodeJpeg(img *image.Image, q int) (io.Reader, error) {
if *img == nil {
return nil, imgproxyerr.New(imgproxyerr.WARNING, errors.New("img is nil."))
}
if !(0 <= q && q <= 100) {
q = jpeg.DefaultQuality
}
buf := new(bytes.Buffer)
err := jpeg.Encode(buf, *img, &jpeg.Options{Quality: q})
return buf, imgproxyerr.New(imgproxyerr.WARNING, err)
}
func EncodePNG(img *image.Image, q int) (io.Reader, error) {
if *img == nil {
return nil, imgproxyerr.New(imgproxyerr.WARNING, errors.New("img is nil."))
}
// Split quality from 0 to 100 in 4 CompressionLevel
// https://golang.org/pkg/image/png/#CompressionLevel
var e png.Encoder
switch {
case 0 <= q && q <= 25:
e.CompressionLevel = png.BestCompression
case 25 < q && q <= 50:
e.CompressionLevel = png.DefaultCompression
case 50 < q && q <= 75:
e.CompressionLevel = png.BestSpeed
case 75 < q && q <= 100:
e.CompressionLevel = png.NoCompression
default:
e.CompressionLevel = png.DefaultCompression
}
buf := new(bytes.Buffer)
err := e.Encode(buf, *img)
return buf, imgproxyerr.New(imgproxyerr.WARNING, err)
}
func EncodeGIF(img *image.Image, q int) (io.Reader, error) {
if *img == nil {
return nil, imgproxyerr.New(imgproxyerr.WARNING, errors.New("img is nil."))
}
// GIF is not support quality
buf := new(bytes.Buffer)
err := gif.Encode(buf, *img, &gif.Options{})
return buf, imgproxyerr.New(imgproxyerr.WARNING, err)
}
func EncodeWebP(img *image.Image, q int, lossless bool) (io.Reader, error) {
if *img == nil {
return nil, imgproxyerr.New(imgproxyerr.WARNING, errors.New("img is nil."))
}
if !(0 <= q && q < 100) {
// webp.DefaulQuality = 90 is large, adjust to JPEG
q = jpeg.DefaultQuality
}
var option webp.Options
if lossless {
option.Lossless = true
} else {
option.Lossless = false
option.Quality = float32(q)
}
buf := new(bytes.Buffer)
err := webp.Encode(buf, *img, &option)
return buf, imgproxyerr.New(imgproxyerr.WARNING, err)
}
//DecodeImage is return image.Image
func DecodeImage(r io.Reader) (*Image, error) {
img, format, err := decode(r)
return &Image{img: img, format: format}, imgproxyerr.New(imgproxyerr.WARNING, err)
}
//アス比を維持した時の長さを取得する
func keepAspect(img image.Image, w uint, h uint) (uint, uint) {
r := img.Bounds()
if int(w)*r.Max.Y < int(h)*r.Max.X {
return w, 0
} else {
return 0, h
}
}
func resizeImage(img image.Image, w uint, h uint, maxWidth uint, maxHeight uint) image.Image {
if img == nil {
return nil
}
//大きすぎる値はサポートしない
w = max(w, maxWidth)
h = max(h, maxHeight)
w, h = keepAspect(img, w, h)
// 速度・負荷的な問題出た時はアルゴリズム変更
return resize.Resize(w, h, img, resize.Lanczos3)
}
func resizeAndFillImage(img image.Image, w uint, h uint, c color.Color, maxWidth uint, maxHeight uint) image.Image {
if img == nil {
return nil
}
if maxWidth < w || maxHeight < h {
return img
}
ch0 := make(chan image.Image)
ch1 := make(chan *image.RGBA)
// ココらへんの並列化はベンチマーク次第で変更する
go func() {
ch0 <- resizeImage(img, w, h, maxWidth, maxHeight)
}()
go func() {
ch1 <- image.NewRGBA(image.Rect(0, 0, int(w), int(h)))
}()
resizedImage := <-ch0
m := <-ch1
draw.Draw(m, m.Bounds(), &image.Uniform{c}, image.ZP, draw.Src)
//画像の中心座標を計算
centerH := int(h)/2 - (resizedImage.Bounds().Max.Y / 2)
centerW := int(w)/2 - (resizedImage.Bounds().Max.X / 2)
if resizedImage.Bounds().Max.X == int(w) {
draw.Draw(m, m.Bounds(), resizedImage, resizedImage.Bounds().Min.Sub(image.Pt(0, centerH)), draw.Over)
} else if resizedImage.Bounds().Max.Y == int(h) {
draw.Draw(m, m.Bounds(), resizedImage, resizedImage.Bounds().Min.Sub(image.Pt(centerW, 0)), draw.Over)
} else {
return resizedImage
}
return m
}
func (i *Image) ResizeAndFill(w uint, h uint, c color.Color, maxW uint, maxH uint) {
if maxW < w || maxH < h {
return
}
if h == 0 || w == 0 {
return
}
if c == nil {
i.img = resizeImage(i.img, w, h, maxW, maxH)
return
}
i.img = resizeAndFillImage(i.img, w, h, c, maxW, maxH)
}
func crop(img image.Image, w uint, h uint) image.Image {
if img == nil {
return nil
}
if h == 0 || w == 0 {
return img
}
orgW := img.Bounds().Max.X
orgH := img.Bounds().Max.Y
r := float64(orgW) / float64(w)
if (float64(orgW) / float64(orgH)) > (float64(w) / float64(h)) {
r = float64(orgH) / float64(h)
}
startW := orgW/2 - int(float64(w)*r/2)
startH := orgH/2 - int(float64(h)*r/2)
result := image.NewRGBA(image.Rect(0, 0, int(float64(w)*r), int(float64(h)*r)))
for y := 0; y < int(float64(h)*r); y++ {
for x := 0; x < int(float64(w)*r); x++ {
c := img.At(x+startW, y+startH)
result.Set(x, y, c)
}
}
return result
}
func (i *Image) Crop(w uint, h uint) {
i.img = crop(i.img, w, h)
}
func (i *Image) GetImg() *image.Image {
return &i.img
}
func (i *Image) GetFormat() string {
return i.format
}
func Set404Image(path string, w uint, h uint, c color.Color, maxW uint, maxH uint) (io.Reader, error) {
f, err := os.Open(path)
if err != nil {
return nil, imgproxyerr.New(imgproxyerr.ERROR, err)
}
img, err := DecodeImage(f)
if err != nil {
return nil, imgproxyerr.New(imgproxyerr.ERROR, err)
}
img.ResizeAndFill(w, h, c, maxW, maxH)
return EncodeJpeg(img.GetImg(), jpeg.DefaultQuality)
}
func toRadian(n int) float64 {
return float64(n) * math.Pi / 180.0
}
func applyOrientation(s image.Image, o int) (d draw.Image, e error) {
bounds := s.Bounds()
if o == 0 {
o = 1
}
if o >= 5 && o <= 8 {
bounds = rotateRect(bounds)
}
d = image.NewRGBA(bounds)
affine := affines[o]
e = affine.TransformCenter(d, s, interp.Bilinear)
return
}
func rotateRect(r image.Rectangle) image.Rectangle {
s := r.Size()
return image.Rectangle{r.Min, image.Point{s.Y, s.X}}
}
func readOrientation(r io.Reader) (o int, err error) {
e, err := exif.Decode(r)
if err != nil {
return
}
tag, err := e.Get(exif.Orientation)
if err != nil {
return
}
o, err = tag.Int(0)
if err != nil {
return
}
return
}
func decode(r io.Reader) (d image.Image, format string, err error) {
var buf bytes.Buffer
tee := io.TeeReader(r, &buf)
s, format, err := image.Decode(tee)
if err != nil {
return
}
o, err := readOrientation(&buf)
if err != nil {
return s, format, nil
}
d, err = applyOrientation(s, o)
return
}