You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: scaledbarcode.go
    path of file: ./repos/barcode
    
    the code of the file until where you have to start completion: package barcode

import (
	"errors"
	"fmt"
	"image"
	"image/color"
	"math"
)

type wrapFunc func(x, y int) color.Color

type scaledBarcode struct {
	wrapp
    
func Scale(bc Barcode, width, height int) (Barcode, error) {
	switch bc.Metadata().Dimensions {
	case 1:
		return scale1DCode(bc, width, height)
	case 2:
		return scale2DCode(bc, width, height)
	}

	return nil, errors.New("unsupported barcode format")
}