adjustCompleteIndicatorColumnRowNumbers method

void adjustCompleteIndicatorColumnRowNumbers(BarcodeMetadata barcodeMetadata)

Implementation

void adjustCompleteIndicatorColumnRowNumbers(
  BarcodeMetadata barcodeMetadata,
) {
  _setRowNumbers();
  _removeIncorrectCodewords(codewords, barcodeMetadata);
  final top = isLeft ? boundingBox.topLeft : boundingBox.topRight;
  final bottom = isLeft ? boundingBox.bottomLeft : boundingBox.bottomRight;
  final firstRow = imageRowToCodewordIndex(top.y.toInt());
  final lastRow = imageRowToCodewordIndex(bottom.y.toInt());
  // We need to be careful using the average row height. Barcode could be skewed so that we have smaller and
  // taller rows
  //double averageRowHeight = (lastRow - firstRow) / (double) barcodeMetadata.getRowCount();
  int barcodeRow = -1;
  int maxRowHeight = 1;
  int currentRowHeight = 0;
  for (int codewordsRow = firstRow; codewordsRow < lastRow; codewordsRow++) {
    if (codewords[codewordsRow] == null) {
      continue;
    }
    final codeword = codewords[codewordsRow]!;

    final rowDifference = codeword.rowNumber - barcodeRow;

    // TODO improve handling with case where first row indicator doesn't start with 0

    if (rowDifference == 0) {
      currentRowHeight++;
    } else if (rowDifference == 1) {
      maxRowHeight = math.max(maxRowHeight, currentRowHeight);
      currentRowHeight = 1;
      barcodeRow = codeword.rowNumber;
    } else if (rowDifference < 0 ||
        codeword.rowNumber >= barcodeMetadata.rowCount ||
        rowDifference > codewordsRow) {
      codewords[codewordsRow] = null;
    } else {
      int checkedRows;
      if (maxRowHeight > 2) {
        checkedRows = (maxRowHeight - 2) * rowDifference;
      } else {
        checkedRows = rowDifference;
      }
      bool closePreviousCodewordFound = checkedRows >= codewordsRow;
      for (int i = 1; i <= checkedRows && !closePreviousCodewordFound; i++) {
        // there must be (height * rowDifference) number of codewords missing. For now we assume height = 1.
        // This should hopefully get rid of most problems already.
        closePreviousCodewordFound = codewords[codewordsRow - i] != null;
      }
      if (closePreviousCodewordFound) {
        codewords[codewordsRow] = null;
      } else {
        barcodeRow = codeword.rowNumber;
        currentRowHeight = 1;
      }
    }
  }
  //return (int) (averageRowHeight + 0.5);
}