/// <summary>
/// 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.
/// </summary>
/// <param name="dataBits">The data bits.</param>
/// <param name="maskPattern">The mask pattern.</param>
/// <param name="matrix">The matrix.</param>
public static void embedDataBits(BitArray 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[xx, y]))
{
continue;
}
int bit;
if (bitIndex < dataBits.Size)
{
bit = dataBits[bitIndex] ? 1 : 0;
++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[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);
}
}
// 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)
{
return(MaskUtil.applyMaskPenaltyRule1(matrix)
+ MaskUtil.applyMaskPenaltyRule2(matrix)
+ MaskUtil.applyMaskPenaltyRule3(matrix)
+ MaskUtil.applyMaskPenaltyRule4(matrix));
}