Пример #1
0
        // Embed "dataBits" using "getMaskPattern". On success, modify the matrix and return true.
        // For debugging purposes, it skips masking process if "getMaskPattern" is -1.
        // See 8.7 of JISX0510:2004 (p.38) for how to embed data bits.
        public static void  embedDataBits(BitVector dataBits, int maskPattern, ByteMatrix matrix)
        {
            int bitIndex  = 0;
            int direction = -1;
            // Start from the right bottom cell.
            int x = matrix.Width - 1;
            int y = matrix.Height - 1;

            while (x > 0)
            {
                // Skip the vertical timing pattern.
                if (x == 6)
                {
                    x -= 1;
                }
                while (y >= 0 && y < matrix.Height)
                {
                    for (int i = 0; i < 2; ++i)
                    {
                        int xx = x - i;
                        // Skip the cell if it's not empty.
                        if (!isEmpty(matrix.get_Renamed(xx, y)))
                        {
                            continue;
                        }
                        int bit;
                        if (bitIndex < dataBits.size())
                        {
                            bit = dataBits.at(bitIndex);
                            ++bitIndex;
                        }
                        else
                        {
                            // Padding bit. If there is no bit left, we'll fill the left cells with 0, as described
                            // in 8.4.9 of JISX0510:2004 (p. 24).
                            bit = 0;
                        }

                        // Skip masking if mask_pattern is -1.
                        if (maskPattern != -1)
                        {
                            if (MaskUtil.getDataMaskBit(maskPattern, xx, y))
                            {
                                bit ^= 0x1;
                            }
                        }
                        matrix.set_Renamed(xx, y, bit);
                    }
                    y += direction;
                }
                direction = -direction; // Reverse the direction.
                y        += direction;
                x        -= 2;          // Move to the left.
            }
            // All bits should be consumed.
            if (bitIndex != dataBits.size())
            {
                throw new WriterException("Not all bits consumed: " + bitIndex + '/' + dataBits.size());
            }
        }
Пример #2
0
 // The mask penalty calculation is complicated.  See Table 21 of JISX0510:2004 (p.45) for details.
 // Basically it applies four rules and summate all penalties.
 private static int calculateMaskPenalty(ByteMatrix matrix)
 {
     int penalty = 0;
     penalty += MaskUtil.applyMaskPenaltyRule1(matrix);
     penalty += MaskUtil.applyMaskPenaltyRule2(matrix);
     penalty += MaskUtil.applyMaskPenaltyRule3(matrix);
     penalty += MaskUtil.applyMaskPenaltyRule4(matrix);
     return penalty;
 }