// convert a src ppm image to a dst png image, resizing to a largest dimension
// max if max != 0
func ppmToPng(src, dst string, max int) error {
in, err := os.Open(src)
if err != nil {
return err
}
img, _, err := image.Decode(in)
in.Close()
if err != nil {
return err
}
// resize the image if necessary
if max != 0 {
img = resize.Thumbnail(uint(max), uint(max), img, resize.NearestNeighbor)
}
out, err := os.Create(dst)
if err != nil {
return err
}
err = png.Encode(out, img)
if err != nil {
return err
}
return nil
}
// convert a src ppm image to a dst png image, resizing to a largest dimension
// max if max != 0
func ppmToPng(src []byte, max int) ([]byte, error) {
in := bytes.NewReader(src)
img, _, err := image.Decode(in)
if err != nil {
return nil, err
}
// resize the image if necessary
if max != 0 {
img = resize.Thumbnail(uint(max), uint(max), img, resize.NearestNeighbor)
}
out := new(bytes.Buffer)
err = png.Encode(out, img)
if err != nil {
return nil, err
}
return out.Bytes(), nil
}