package main

import (
  "log"
  "image/gif"
  "image"
  "os"

  "github.com/nfnt/resize"
  "github.com/oliamb/cutter"
)

func main() {
  if err := run(); err != nil {
    log.Fatal(err)
  }
}

func run() error {
  src, err := os.Open("sample.gif")
  if err != nil {
    return err
  }
  defer src.Close()
  
  img, _, err := image.Decode(src)
  if err != nil {
    return err
  }

	thumbnail := resize.Resize(111, 100, img, resize.Lanczos3)

	cropped, err := cutter.Crop(thumbnail, cutter.Config{
		Width:  100,
		Height: 100,
		Mode:   cutter.Centered,
	})
	if err != nil {
		return err
	}

  dest, err := os.Create("output.gif")
  if err != nil {
    return err
  }
  defer dest.Close()

  if err := gif.Encode(dest, cropped, nil); err != nil {
    return err
  }

  return nil
}