-

package main

import (
	"bytes"
	"encoding/base64"
	"fmt"
	"image"
	"image/png"
)

func Pic(dx, dy int) [][]uint8 {
    img := make([][]uint8, dy);
    for i := range img{
        img[i] = make([]uint8, dx);
        for j := range img[i] {
            img[i][j] = uint8(i^j); // 式
        }
    }
    return img;
}

func main() {
    Show(Pic)
}


func Show(f func(int, int) [][]uint8) {
	const (
		dx = 512
		dy = 512
	)
	data := f(dx, dy)
	m := image.NewNRGBA(image.Rect(0, 0, dx, dy))
	for y := 0; y < dy; y++ {
		for x := 0; x < dx; x++ {
			v := data[y][x]
			i := y*m.Stride + x*4
			m.Pix[i] = v
			m.Pix[i+1] = v
			m.Pix[i+2] = 0
			m.Pix[i+3] = v
		}
	}
	ShowImage(m)
}

func ShowImage(m image.Image) {
	var buf bytes.Buffer
	err := png.Encode(&buf, m)
	if err != nil {
		panic(err)
	}
	enc := base64.StdEncoding.EncodeToString(buf.Bytes())
	fmt.Println("data:image/png;base64," + enc)
}

// go tutrial https://code.google.com/p/go-tour/ のコードの改変したものを含む
// 元のソースコードはApache License である