// Decode reads a CR2 image from r and returns the embedded JPEG thumbnail as
// an image.Image.
func Decode(r io.Reader) (image.Image, error) {
r, err := NewReader(r)
if err != nil {
return nil, err
}
return jpeg.Decode(r)
}
func TestParseUserAttribute(t *testing.T) {
r := base64.NewDecoder(base64.StdEncoding, bytes.NewBufferString(userAttributePacket))
for i := 0; i < 2; i++ {
p, err := Read(r)
if err != nil {
t.Fatal(err)
}
uat := p.(*UserAttribute)
imgs := uat.ImageData()
if len(imgs) != 1 {
t.Errorf("Unexpected number of images in user attribute packet: %d", len(imgs))
}
if len(imgs[0]) != 3395 {
t.Errorf("Unexpected JPEG image size: %d", len(imgs[0]))
}
img, err := jpeg.Decode(bytes.NewBuffer(imgs[0]))
if err != nil {
t.Errorf("Error decoding JPEG image: %v", err)
}
// A pixel in my right eye.
pixel := color.NRGBAModel.Convert(img.At(56, 36))
ref := color.NRGBA{R: 157, G: 128, B: 124, A: 255}
if pixel != ref {
t.Errorf("Unexpected pixel color: %v", pixel)
}
w := bytes.NewBuffer(nil)
err = uat.Serialize(w)
if err != nil {
t.Errorf("Error writing user attribute: %v", err)
}
r = bytes.NewBuffer(w.Bytes())
}
}