private uint SelectAndApplyMaskingPattern()
{
// Masks the QR code to minimize chance of data transmission error
// See ISO/IEC 18004:2006(E), Sec. 6.8
SymbolTemplate[] candidates = new SymbolTemplate[_dataMaskPredicates.Length - 1];
for (int i = 0; i < candidates.Length; i++)
{
SymbolTemplate candidate = new SymbolTemplate(this); // copy ctor
candidate.ApplyMask(_dataMaskPredicates[i]);
candidates[i] = candidate;
}
int lowestPenaltyScoreValue = candidates[0].CalculatePenaltyScore();
int lowestPenaltyScoreIndex = 0;
for (int i = 1; i < candidates.Length; i++)
{
int candidatePenaltyScoreValue = candidates[i].CalculatePenaltyScore();
if (candidatePenaltyScoreValue < lowestPenaltyScoreValue)
{
lowestPenaltyScoreValue = candidatePenaltyScoreValue;
lowestPenaltyScoreIndex = i;
}
}
// copy the candidate modules array into me; copy by ref is fine
this._modules = candidates[lowestPenaltyScoreIndex]._modules;
return((uint)lowestPenaltyScoreIndex);
}
internal static IEnumerable<Coord> GetBitStreamMapping(SymbolTemplate symbol)
{
// See ISO/IEC 18004:2006(E), Sec. 6.7.3 for information on where codewords
// are placed in the matrix.
int width = symbol.Width;
bool isMovingUpward = true;
for (int col = width - 1; col > 0; col -= 2)
{
// Column six is used as a timing pattern and is skipped for codeword placement
if (col == 6) { col--; }
if (isMovingUpward)
{
for (int row = width - 1; row >= 0; row--)
{
if (!symbol.IsReservedModule(row, col)) { yield return new Coord(row, col); }
if (!symbol.IsReservedModule(row, col - 1)) { yield return new Coord(row, col - 1); }
}
}
else
{
for (int row = 0; row < width; row++)
{
if (!symbol.IsReservedModule(row, col)) { yield return new Coord(row, col); }
if (!symbol.IsReservedModule(row, col - 1)) { yield return new Coord(row, col - 1); }
}
}
isMovingUpward = !isMovingUpward; // reverse direction when hitting the end of the matrix
}
}
// copy ctor
private SymbolTemplate(SymbolTemplate prototype)
{
this._modules = prototype._modules.CreateCopy();
this.ErrorCorrectionLevel = prototype.ErrorCorrectionLevel;
this.Version = prototype.Version;
this.Width = prototype.Width;
}
// copy ctor
private SymbolTemplate(SymbolTemplate prototype)
{
this._modules = prototype._modules.CreateCopy();
this.ErrorCorrectionLevel = prototype.ErrorCorrectionLevel;
this.Version = prototype.Version;
this.Width = prototype.Width;
}
internal static IEnumerable <Coord> GetBitStreamMapping(SymbolTemplate symbol)
{
// See ISO/IEC 18004:2006(E), Sec. 6.7.3 for information on where codewords
// are placed in the matrix.
int width = symbol.Width;
bool isMovingUpward = true;
for (int col = width - 1; col > 0; col -= 2)
{
// Column six is used as a timing pattern and is skipped for codeword placement
if (col == 6)
{
col--;
}
if (isMovingUpward)
{
for (int row = width - 1; row >= 0; row--)
{
if (!symbol.IsReservedModule(row, col))
{
yield return(new Coord(row, col));
}
if (!symbol.IsReservedModule(row, col - 1))
{
yield return(new Coord(row, col - 1));
}
}
}
else
{
for (int row = 0; row < width; row++)
{
if (!symbol.IsReservedModule(row, col))
{
yield return(new Coord(row, col));
}
if (!symbol.IsReservedModule(row, col - 1))
{
yield return(new Coord(row, col - 1));
}
}
}
isMovingUpward = !isMovingUpward; // reverse direction when hitting the end of the matrix
}
}
public static SymbolTemplate CreateTemplate(int version)
{
Debug.Assert(1 <= version && version <= 40);
// Lazy initialization of this symbol template
SymbolTemplate template = Volatile.Read(ref _symbolTemplates[version - 1]);
if (template == null)
{
SymbolTemplate newTemplate = new SymbolTemplate(version);
template = Interlocked.CompareExchange(ref _symbolTemplates[version - 1], newTemplate, null) ?? newTemplate;
}
// Return a copy since the templates are mutable
return(new SymbolTemplate(template));
}
public static Image GetQRCode(byte[] data, ErrorCorrectionLevel level = ErrorCorrectionLevel.M)
{
bool requires16BitLength = false;
int maxBytesInVersion9Code = QRErrorCorrections.GetQRVersionInfo(9).GetCorrectionInfo(level).TotalDataBytes;
if (maxBytesInVersion9Code - 2 < data.Length)
{
// This data requires a version 10 or higher code; will not fit in version 9 or lower.
// Version 10 and higher codes require 16-bit data lengths.
requires16BitLength = true;
}
StreamHelper sh = new StreamHelper();
sh.WriteNibble(0x04); // byte mode
if (requires16BitLength)
{
sh.WriteWord((ushort)data.Length);
}
else
{
sh.WriteByte((byte)data.Length);
}
sh.WriteBytes(new ArraySegment <byte>(data));
sh.WriteNibble(0x00); // terminator
byte[] binaryData = sh.ToArray();
int qrCodeVersion;
ErrorCorrectionLevel errorCorrectionLevel;
byte[] finalMessageSequence = QRErrorCorrections.GetMessageSequence(binaryData, level, out qrCodeVersion, out errorCorrectionLevel);
SymbolTemplate template = SymbolTemplate.CreateTemplate(qrCodeVersion);
template.ErrorCorrectionLevel = errorCorrectionLevel;
template.PopulateData(finalMessageSequence);
template.Complete();
return(template.ToImage());
}
internal static IEnumerable<CodewordPlacement> GetCodewordPlacements(SymbolTemplate symbol)
{
var bitstreamMapping = GetBitStreamMapping(symbol);
return GetCodewordPlacementsImpl(bitstreamMapping);
}
internal static IEnumerable <CodewordPlacement> GetCodewordPlacements(SymbolTemplate symbol)
{
var bitstreamMapping = GetBitStreamMapping(symbol);
return(GetCodewordPlacementsImpl(bitstreamMapping));
}
private uint SelectAndApplyMaskingPattern()
{
// Masks the QR code to minimize chance of data transmission error
// See ISO/IEC 18004:2006(E), Sec. 6.8
SymbolTemplate[] candidates = new SymbolTemplate[_dataMaskPredicates.Length - 1];
for (int i = 0; i < candidates.Length; i++)
{
SymbolTemplate candidate = new SymbolTemplate(this); // copy ctor
candidate.ApplyMask(_dataMaskPredicates[i]);
candidates[i] = candidate;
}
int lowestPenaltyScoreValue = candidates[0].CalculatePenaltyScore();
int lowestPenaltyScoreIndex = 0;
for (int i = 1; i < candidates.Length; i++)
{
int candidatePenaltyScoreValue = candidates[i].CalculatePenaltyScore();
if (candidatePenaltyScoreValue < lowestPenaltyScoreValue)
{
lowestPenaltyScoreValue = candidatePenaltyScoreValue;
lowestPenaltyScoreIndex = i;
}
}
// copy the candidate modules array into me; copy by ref is fine
this._modules = candidates[lowestPenaltyScoreIndex]._modules;
return (uint)lowestPenaltyScoreIndex;
}
public static SymbolTemplate CreateTemplate(int version)
{
Debug.Assert(1 <= version && version <= 40);
// Lazy initialization of this symbol template
SymbolTemplate template = Volatile.Read(ref _symbolTemplates[version - 1]);
if (template == null)
{
SymbolTemplate newTemplate = new SymbolTemplate(version);
template = Interlocked.CompareExchange(ref _symbolTemplates[version - 1], newTemplate, null) ?? newTemplate;
}
// Return a copy since the templates are mutable
return new SymbolTemplate(template);
}