func NewBitmap(code barcode.Barcode) *Bitmap {
dim := code.Bounds().Max
b := &Bitmap{data: make([]bool, dim.X*dim.Y), height: dim.Y, width: dim.X}
for y := 0; y < dim.Y; y++ {
for x := 0; x < dim.X; x++ {
if code.At(x, y) == color.Black {
b.Set(x, y, true)
}
}
}
return b
}
