internal

var Draw Drawer = draw.Draw

var EncodeImage ImageEncoder = png.Encode

var NewImage ImageMaker = func(width, height int) *image.RGBA {
	return image.NewRGBA(image.Rect(0, 0, width, height))
}

var WriteImage ImageWriter = func(file string, i image.Image) error {
	f, err := os.Create(file)
	if err != nil {
		return err
	}
	err = EncodeImage(f, i)
	if err != nil {
		return err
	}
	return f.Close()
}