// DetectOrientation detects the current Image Orientation from the EXIF header.
func DetectOrientation(image *vips.Image) Orientation {
o, ok := image.ImageGetAsString(vips.ExifOrientation)
if !ok || o == "" {
return Undefined
}
orientation, err := strconv.Atoi(o[:1])
if err != nil || orientation <= 0 || orientation >= len(orientationInfo) {
return Undefined
}
return Orientation(orientation)
}