Method readModule

src/core/datamatrix/decoder/BitMatrixParser.ts:155–167

* Reads a bit of the mapping matrix accounting for boundary wrapping. * * @param row Row to read in the mapping matrix * @param column Column to read in the mapping matrix * @param numRows Number of rows in the mapping matrix * @param numColumns Number of columns in the mapping

(row: number, column: number, numRows: number, numColumns: number)

   * @return value of the given bit in the mapping matrix
   */
  private readModule(row: number, column: number, numRows: number, numColumns: number): boolean {
    // Adjust the row and column indices based on boundary wrapping
    if (row < 0) {
      row += numRows;
      column += 4 - ((numRows + 4) & 0x07);
    }
    if (column < 0) {
      column += numColumns;
      row += 4 - ((numColumns + 4) & 0x07);
    }
    this.readMappingMatrix.set(column, row);
    return this.mappingBitMatrix.get(column, row);
  }

  /**
   * <p>Reads the 8 bits of the standard Utah-shaped pattern.</p>