package com.demo; 
import com.google.zxing.common.BitMatrix; 
    
 import javax.imageio.ImageIO; 
 import java.io.File; 
 import java.io.OutputStream; 
 import java.io.IOException; 
 import java.awt.image.BufferedImage; 
    
    
 public final class MatrixToImageWriter { 
    
   private static final int BLACK = 0xFF000000; 
   private static final int WHITE = 0xFFFFFFFF; 
    
   private MatrixToImageWriter() {} 
    
      
   public static BufferedImage toBufferedImage(BitMatrix matrix) { 
     int width = matrix.getWidth(); 
     int height = matrix.getHeight(); 
     BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 
     for (int x = 0; x < width; x++) { 
       for (int y = 0; y < height; y++) { 
         image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE); 
       } 
     } 
     return image; 
   } 
    
      
   public static void writeToFile(BitMatrix matrix, String format, File file) 
       throws IOException { 
     BufferedImage image = toBufferedImage(matrix); 
     if (!ImageIO.write(image, format, file)) { 
       throw new IOException("Could not write an image of format " + format + " to " + file); 
     } 
   } 
    
      
   public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) 
       throws IOException { 
     BufferedImage image = toBufferedImage(matrix); 
     if (!ImageIO.write(image, format, stream)) { 
       throw new IOException("Could not write an image of format " + format); 
     } 
   } 
    
 }