compy/transcoder/png.go
Andrew Gaul 9518dc2f1a Add PNG and JPEG to WebP transcoding
WebP lossy mode offers up to 30% better compression than JPEG.
2017-01-16 00:06:17 -08:00

32 lines
542 B
Go

package transcoder
import (
"github.com/barnacs/compy/proxy"
"github.com/chai2010/webp"
"image/png"
"net/http"
)
type Png struct{}
func (t *Png) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader, headers http.Header) error {
img, err := png.Decode(r)
if err != nil {
return err
}
if SupportsWebP(headers) {
options := webp.Options{
Lossless: true,
}
if err = webp.Encode(w, img, &options); err != nil {
return err
}
} else {
if err = png.Encode(w, img); err != nil {
return err
}
}
return nil
}