initial commit

transcoder/jpeg.go

@@ -0,0 +1,32 @@
+package transcoder
+
+import (
+	"github.com/barnacs/compy/proxy"
+	"github.com/pixiv/go-libjpeg/jpeg"
+)
+
+type Jpeg struct {
+	decOptions *jpeg.DecoderOptions
+	encOptions *jpeg.EncoderOptions
+}
+
+func NewJpeg(quality int) *Jpeg {
+	return &Jpeg{
+		decOptions: &jpeg.DecoderOptions{},
+		encOptions: &jpeg.EncoderOptions{
+			Quality:        quality,
+			OptimizeCoding: true,
+		},
+	}
+}
+
+func (t *Jpeg) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader) error {
+	img, err := jpeg.Decode(r, t.decOptions)
+	if err != nil {
+		return err
+	}
+	if err = jpeg.Encode(w, img, t.encOptions); err != nil {
+		return err
+	}
+	return nil
+}