/// <summary>
/// Embed format information to tristatematrix.
/// Process combination of create info bits, BCH error correction bits calculation, embed towards matrix.
/// </summary>
/// <remarks>ISO/IEC 18004:2000 Chapter 8.9 Page 53</remarks>
internal static void EmbedFormatInformation(this TriStateMatrix triMatrix, ErrorCorrectionLevel errorlevel, Pattern pattern)
{
BitList formatInfo = GetFormatInfoBits(errorlevel, pattern);
int width = triMatrix.Width;
for(int index = 0; index < 15; index++)
{
MatrixPoint point = PointForInfo1(index);
bool bit = formatInfo[index];
triMatrix[point.X, point.Y, MatrixStatus.NoMask] = bit;
if(index < 7)
{
triMatrix[8, width - 1 - index, MatrixStatus.NoMask] = bit;
}
else
{
triMatrix[width - 8 + (index - 7), 8, MatrixStatus.NoMask] = bit;
}
}
}
private static BitList GetFormatInfoBits(ErrorCorrectionLevel errorlevel, Pattern pattern)
{
int formatInfo = (int)pattern.MaskPatternType;
//Pattern bits length = 3
formatInfo |= GetErrorCorrectionIndicatorBits(errorlevel) << 3;
int bchCode = BCHCalculator.CalculateBCH(formatInfo, s_FormatInfoPoly);
//bchCode length = 10
formatInfo = (formatInfo << 10) | bchCode;
//xor maskPattern
formatInfo ^= s_FormatInfoMaskPattern;
BitList resultBits = new BitList();
resultBits.Add(formatInfo, 15);
if(resultBits.Count != 15)
throw new Exception("FormatInfoBits length is not 15");
else
return resultBits;
}
public static TriStateMatrix Xor(this TriStateMatrix first, Pattern second, ErrorCorrectionLevel errorlevel)
{
TriStateMatrix result = XorMatrix(first, second);
result.EmbedFormatInformation(errorlevel, second);
return result;
}
public static TriStateMatrix Apply(this TriStateMatrix matrix, Pattern pattern, ErrorCorrectionLevel errorlevel)
{
return matrix.Xor(pattern, errorlevel);
}
public static TriStateMatrix Apply(this Pattern pattern, TriStateMatrix matrix, ErrorCorrectionLevel errorLevel) => matrix.Xor(pattern, errorLevel);