func run(paths []string) {
if len(paths) < 2 {
log.Fatal("Require 2 or more images")
}
var data *exif.Exif
images := make([]image.Image, len(paths))
for i, path := range paths {
// Open
file, err := os.Open(path)
if err != nil {
log.Fatal(path, "\n", err)
}
defer file.Close()
// Decode
m, _, err := image.Decode(file)
if err != nil {
log.Fatal(path, "\n", err)
}
if i == 0 {
file.Seek(0, 0)
data = exif.Decode(file)
}
images[i] = m
}
// Assume all photos are the same size as the first (stupid!)
bounds := images[0].Bounds()
// This is the width of a column. It mean that some of the right of an image
// may be sacrificed. But it does mean all columns are exact pixels, and are
// all exactly the same size.
width := bounds.Dx() / len(images)
out := image.NewRGBA(image.Rect(
bounds.Min.X, bounds.Min.Y, bounds.Min.X+(len(images)*width), bounds.Max.Y,
))
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Min.X+(len(images)*width); x++ {
col := x / width
out.Set(x, y, images[col].At(x, y))
}
}
utils.WriteStdout(out, data)
}
// ReadStdin reads an image file (either PNG, JPEG or GIF) from standard input.
func ReadStdin() (image.Image, *exif.Exif) {
img, _, _ := image.Decode(os.Stdin)
os.Stdin.Seek(0, 0)
data := exif.Decode(os.Stdin)
return img, data
}