Review

19

com/itextpdf/text/pdf/qrcode/MatrixUtil.java

embedPositionDetectionPatternsAndSeparators(ByteMatrix)

class MatrixUtil {
  // Embed position detection patterns and surrounding vertical/horizontal separators.
  private static void embedPositionDetectionPatternsAndSeparators(ByteMatrix matrix) throws WriterException {
    // Embed three big squares at corners.
    int pdpWidth = POSITION_DETECTION_PATTERN[0].length;
    // Left top corner.
    embedPositionDetectionPattern(0, 0, matrix);
    // Right top corner.
    embedPositionDetectionPattern(matrix.getWidth() - pdpWidth, 0, matrix);
    // Left bottom corner.
    embedPositionDetectionPattern(0, matrix.getWidth() - pdpWidth, matrix);

    // Embed horizontal separation patterns around the squares.
    int hspWidth = HORIZONTAL_SEPARATION_PATTERN[0].length;
    // Left top corner.
    embedHorizontalSeparationPattern(0, hspWidth - 1, matrix);
    // Right top corner.
    embedHorizontalSeparationPattern(matrix.getWidth() - hspWidth,
        hspWidth - 1, matrix);
    // Left bottom corner.
    embedHorizontalSeparationPattern(0, matrix.getWidth() - hspWidth, matrix);

    // Embed vertical separation patterns around the squares.
    int vspSize = VERTICAL_SEPARATION_PATTERN.length;
    // Left top corner.
    embedVerticalSeparationPattern(vspSize, 0, matrix);
    // Right top corner.
    embedVerticalSeparationPattern(matrix.getHeight() - vspSize - 1, 0, matrix);
    // Left bottom corner.
    embedVerticalSeparationPattern(vspSize, matrix.getHeight() - vspSize,
        matrix);
  }

}