Change libjpeg library, rename tag

image/encode_libjpeg.go

@@ -0,0 +1,28 @@
+//go:build libjpeg
+
+// Package image.
+package image
+
+import (
+	"image"
+	"io"
+
+	"github.com/pixiv/go-libjpeg/jpeg"
+)
+
+// NewEncoder returns a new Encoder.
+func NewEncoder(w io.Writer) *Encoder {
+	return &Encoder{w}
+}
+
+// Encoder struct.
+type Encoder struct {
+	w io.Writer
+}
+
+// Encode encodes image to JPEG.
+func (e Encoder) Encode(img image.Image) error {
+	return jpeg.Encode(e.w, img, &jpeg.EncoderOptions{
+		Quality: 75,
+	})
+}