golang 透明底图转白底

	url := ""
	var s []byte
	// 请求线上图片
	s = GetUrl(url)

	// 处理透明底图转白底
	img, _, err := image.Decode(bytes.NewReader(s))
	if err != nil {
		fmt.Println("读取图片失败")
	}
	bounds := img.Bounds()
	dst := image.NewNRGBA(bounds)
	draw.Draw(dst, bounds, image.White, image.Point{}, draw.Src)
	draw.Draw(dst, bounds, img, bounds.Min, draw.Over)
	ou, _ := os.Create("ss.jpeg")
	defer ou.Close()
	png.Encode(ou, dst)
	// buf := new(bytes.Buffer)
	err = jpeg.Encode(ou, dst, nil)
	if err != nil {
		fmt.Println("生成白底图失败")
	}