compy/transcoder/png.go

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package transcoder
import (
"github.com/barnacs/compy/proxy"
"github.com/chai2010/webp"
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"image/png"
"net/http"
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)
type Png struct{}
func (t *Png) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader, headers http.Header) error {
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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
}
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}
return nil
}