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Java SE-specific extensions to core ZXing library
There is a newer version: 3.5.3
/*
 * Copyright 2009 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.j2se;

import com.google.zxing.common.BitArray;
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;
import java.nio.file.Path;

/**
 * Writes a {@link BitMatrix} to {@link BufferedImage},
 * file or stream. Provided here instead of core since it depends on
 * Java SE libraries.
 *
 * @author Sean Owen
 */
public final class MatrixToImageWriter {

  private static final MatrixToImageConfig DEFAULT_CONFIG = new MatrixToImageConfig();

  private MatrixToImageWriter() {}

  /**
   * Renders a {@link BitMatrix} as an image, where "false" bits are rendered
   * as white, and "true" bits are rendered as black. Uses default configuration.
   *
   * @param matrix {@link BitMatrix} to write
   * @return {@link BufferedImage} representation of the input
   */
  public static BufferedImage toBufferedImage(BitMatrix matrix) {
    return toBufferedImage(matrix, DEFAULT_CONFIG);
  }

  /**
   * As {@link #toBufferedImage(BitMatrix)}, but allows customization of the output.
   *
   * @param matrix {@link BitMatrix} to write
   * @param config output configuration
   * @return {@link BufferedImage} representation of the input
   */
  public static BufferedImage toBufferedImage(BitMatrix matrix, MatrixToImageConfig config) {
    int width = matrix.getWidth();
    int height = matrix.getHeight();
    BufferedImage image = new BufferedImage(width, height, config.getBufferedImageColorModel());
    int onColor = config.getPixelOnColor();
    int offColor = config.getPixelOffColor();
    int[] rowPixels = new int[width];
    BitArray row = new BitArray(width);
    for (int y = 0; y < height; y++) {
      row = matrix.getRow(y, row);
      for (int x = 0; x < width; x++) {
        rowPixels[x] = row.get(x) ? onColor : offColor;
      }
      image.setRGB(0, y, width, 1, rowPixels, 0, width);
    }
    return image;
  }

  /**
   * @param matrix {@link BitMatrix} to write
   * @param format image format
   * @param file file {@link File} to write image to
   * @throws IOException if writes to the file fail
   * @deprecated use {@link #writeToPath(BitMatrix, String, Path)}
   */
  @Deprecated
  public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
    writeToPath(matrix, format, file.toPath());
  }

  /**
   * Writes a {@link BitMatrix} to a file with default configuration.
   *
   * @param matrix {@link BitMatrix} to write
   * @param format image format
   * @param file file {@link Path} to write image to
   * @throws IOException if writes to the stream fail
   * @see #toBufferedImage(BitMatrix)
   */
  public static void writeToPath(BitMatrix matrix, String format, Path file) throws IOException {
    writeToPath(matrix, format, file, DEFAULT_CONFIG);
  }

  /**
   * @param matrix {@link BitMatrix} to write
   * @param format image format
   * @param file file {@link File} to write image to
   * @param config output configuration
   * @throws IOException if writes to the file fail
   * @deprecated use {@link #writeToPath(BitMatrix, String, Path, MatrixToImageConfig)}
   */
  @Deprecated
  public static void writeToFile(BitMatrix matrix, String format, File file, MatrixToImageConfig config) 
      throws IOException {
    writeToPath(matrix, format, file.toPath(), config);
  }

  /**
   * As {@link #writeToPath(BitMatrix, String, Path)}, but allows customization of the output.
   *
   * @param matrix {@link BitMatrix} to write
   * @param format image format
   * @param file file {@link Path} to write image to
   * @param config output configuration
   * @throws IOException if writes to the file fail
   */
  public static void writeToPath(BitMatrix matrix, String format, Path file, MatrixToImageConfig config)
      throws IOException {
    BufferedImage image = toBufferedImage(matrix, config);
    if (!ImageIO.write(image, format, file.toFile())) {
      throw new IOException("Could not write an image of format " + format + " to " + file);
    }
  }

  /**
   * Writes a {@link BitMatrix} to a stream with default configuration.
   *
   * @param matrix {@link BitMatrix} to write
   * @param format image format
   * @param stream {@link OutputStream} to write image to
   * @throws IOException if writes to the stream fail
   * @see #toBufferedImage(BitMatrix)
   */
  public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
    writeToStream(matrix, format, stream, DEFAULT_CONFIG);
  }

  /**
   * As {@link #writeToStream(BitMatrix, String, OutputStream)}, but allows customization of the output.
   *
   * @param matrix {@link BitMatrix} to write
   * @param format image format
   * @param stream {@link OutputStream} to write image to
   * @param config output configuration
   * @throws IOException if writes to the stream fail
   */
  public static void writeToStream(BitMatrix matrix, String format, OutputStream stream, MatrixToImageConfig config) 
      throws IOException {  
    BufferedImage image = toBufferedImage(matrix, config);
    if (!ImageIO.write(image, format, stream)) {
      throw new IOException("Could not write an image of format " + format);
    }
  }

}