Change libjpeg library, rename tag

image/decode_libjpeg.go

@@ -0,0 +1,30 @@
+//go:build libjpeg
+
+// Package image.
+package image
+
+import (
+	"image"
+	"io"
+
+	"github.com/pixiv/go-libjpeg/jpeg"
+)
+
+// NewDecoder returns a new Decoder.
+func NewDecoder(r io.Reader) *Decoder {
+	return &Decoder{r}
+}
+
+// Decoder struct.
+type Decoder struct {
+	r io.Reader
+}
+
+// Decode decodes image from JPEG.
+func (d Decoder) Decode() (image.Image, error) {
+	return jpeg.Decode(d.r, &jpeg.DecoderOptions{
+		DCTMethod:              jpeg.DCTFloat,
+		DisableFancyUpsampling: true,
+		DisableBlockSmoothing:  true,
+	})
+}