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package exiffix
import (
"image"
"io"
"github.com/disintegration/imaging"
"github.com/rwcarlsen/goexif/exif"
)
//Decode is image.Decode handling orientation in EXIF tags if exists.
//Requires io.ReadSeeker instead of io.Reader.
func Decode(reader io.ReadSeeker) (image.Image, string, error) {
img, fmt, err := image.Decode(reader)
if err != nil {
return img, fmt, err
}
reader.Seek(0, io.SeekStart)
orientation := getOrientation(reader)
switch orientation {
case "1":
case "2":
img = imaging.FlipH(img)
case "3":
img = imaging.Rotate180(img)
case "4":
img = imaging.Rotate180(imaging.FlipH(img))
case "5":
img = imaging.Rotate270(imaging.FlipV(img))
case "6":
img = imaging.Rotate270(img)
case "7":
img = imaging.Rotate90(imaging.FlipV(img))
case "8":
img = imaging.Rotate90(img)
}
return img, fmt, err
}
func getOrientation(reader io.Reader) string {
x, err := exif.Decode(reader)
if err != nil {
return "1"
}
if x != nil {
orient, err := x.Get(exif.Orientation)
if err != nil {
return "1"
}
if orient != nil {
return orient.String()
}
}
return "1"
}
|
