github.com/boppreh/gifencoder を使って Animation GIF が作れるかテスト

use_gifencoder.go

package main

import (
	"github.com/boppreh/gifencoder"
	"image"
	"image/gif"
	"io/ioutil"
	"os"
)

func readGIF(filename string) (*gif.GIF, error) {
	f, err := os.Open(filename)
	if err != nil {
		return nil, err
	}
	defer f.Close()
	return gif.DecodeAll(f)
}

func main() {
	frames := []string{
		"./01.gif",
		"./02.gif",
		"./03.gif",
	}

	g := &gif.GIF{
		Image:     make([]*image.Paletted, len(frames)),
		Delay:     make([]int, len(frames)),
		LoopCount: 0,
	}

	for i, f := range frames {
		m, err := readGIF(f)
		if err != nil {
			panic(err)
		}
		g.Image[i] = m.Image[0]
		g.Delay[i] = 2
	}

	file, _ := ioutil.TempFile("", "karaage")
	defer file.Close()

	if err := gifencoder.EncodeAll(file, g); err != nil {
		panic(err)
	}
}