class InvertedLuminanceSource extends LuminanceSource {

  private final LuminanceSource delegate;

  public InvertedLuminanceSource(LuminanceSource delegate) {
    super(delegate.getWidth(), delegate.getHeight());
    this.delegate = delegate;
  }

  @Override
  public byte[] getRow(int y, byte[] row) {
    row = delegate.getRow(y, row);
    int width = getWidth();
    for (int i = 0; i < width; i++) {
      row[i] = (byte) (255 - (row[i] & 0xFF));
    }
    return row;
  }

  @Override
  public byte[] getMatrix() {<FILL_FUNCTION_BODY>}

  @Override
  public boolean isCropSupported() {
    return delegate.isCropSupported();
  }

  @Override
  public LuminanceSource crop(int left, int top, int width, int height) {
    return new InvertedLuminanceSource(delegate.crop(left, top, width, height));
  }

  @Override
  public boolean isRotateSupported() {
    return delegate.isRotateSupported();
  }

  /**
   * @return original delegate {@link LuminanceSource} since invert undoes itself
   */
  @Override
  public LuminanceSource invert() {
    return delegate;
  }

  @Override
  public LuminanceSource rotateCounterClockwise() {
    return new InvertedLuminanceSource(delegate.rotateCounterClockwise());
  }

  @Override
  public LuminanceSource rotateCounterClockwise45() {
    return new InvertedLuminanceSource(delegate.rotateCounterClockwise45());
  }

}

    byte[] matrix = delegate.getMatrix();
    int length = getWidth() * getHeight();
    byte[] invertedMatrix = new byte[length];
    for (int i = 0; i < length; i++) {
      invertedMatrix[i] = (byte) (255 - (matrix[i] & 0xFF));
    }
    return invertedMatrix;
  
<methods>public com.google.zxing.LuminanceSource crop(int, int, int, int) ,public final int getHeight() ,public abstract byte[] getMatrix() ,public abstract byte[] getRow(int, byte[]) ,public final int getWidth() ,public com.google.zxing.LuminanceSource invert() ,public boolean isCropSupported() ,public boolean isRotateSupported() ,public com.google.zxing.LuminanceSource rotateCounterClockwise() ,public com.google.zxing.LuminanceSource rotateCounterClockwise45() ,public final java.lang.String toString() <variables>private final non-sealed int height,private final non-sealed int width