/// <summary>Initialize "qrCode" according to "numInputBytes", "ecLevel", and "mode".</summary>
/// <remarks>
/// Initialize "qrCode" according to "numInputBytes", "ecLevel", and "mode". On success,
/// modify "qrCode".
/// </remarks>
/// <exception cref="iText.Barcodes.Qrcode.WriterException"/>
private static void InitQRCode(int numInputBytes, ErrorCorrectionLevel ecLevel, int desiredMinVersion, Mode
mode, QRCode qrCode)
{
qrCode.SetECLevel(ecLevel);
qrCode.SetMode(mode);
// In the following comments, we use numbers of Version 7-H.
for (int versionNum = desiredMinVersion; versionNum <= 40; versionNum++)
{
Version version = Version.GetVersionForNumber(versionNum);
// numBytes = 196
int numBytes = version.GetTotalCodewords();
// getNumECBytes = 130
Version.ECBlocks ecBlocks = version.GetECBlocksForLevel(ecLevel);
int numEcBytes = ecBlocks.GetTotalECCodewords();
// getNumRSBlocks = 5
int numRSBlocks = ecBlocks.GetNumBlocks();
// getNumDataBytes = 196 - 130 = 66
int numDataBytes = numBytes - numEcBytes;
// We want to choose the smallest version which can contain data of "numInputBytes" + some
// extra bits for the header (mode info and length info). The header can be three bytes
// (precisely 4 + 16 bits) at most. Hence we do +3 here.
if (numDataBytes >= numInputBytes + 3)
{
// Yay, we found the proper rs block info!
qrCode.SetVersion(versionNum);
qrCode.SetNumTotalBytes(numBytes);
qrCode.SetNumDataBytes(numDataBytes);
qrCode.SetNumRSBlocks(numRSBlocks);
// getNumECBytes = 196 - 66 = 130
qrCode.SetNumECBytes(numEcBytes);
// matrix width = 21 + 6 * 4 = 45
qrCode.SetMatrixWidth(version.GetDimensionForVersion());
return;
}
}
throw new WriterException("Cannot find proper rs block info (input data too big?)");
}
// Note that the input matrix uses 0 == white, 1 == black, while the output matrix uses
// 0 == black, 255 == white (i.e. an 8 bit greyscale bitmap).
private static ByteMatrix RenderResult(QRCode code, int width, int height)
{
ByteMatrix input = code.GetMatrix();
int inputWidth = input.GetWidth();
int inputHeight = input.GetHeight();
int qrWidth = inputWidth + (QUIET_ZONE_SIZE << 1);
int qrHeight = inputHeight + (QUIET_ZONE_SIZE << 1);
int outputWidth = Math.Max(width, qrWidth);
int outputHeight = Math.Max(height, qrHeight);
int multiple = Math.Min(outputWidth / qrWidth, outputHeight / qrHeight);
// Padding includes both the quiet zone and the extra white pixels to accommodate the requested
// dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.
// If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will
// handle all the padding from 100x100 (the actual QR) up to 200x160.
int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
int topPadding = (outputHeight - (inputHeight * multiple)) / 2;
ByteMatrix output = new ByteMatrix(outputWidth, outputHeight);
byte[][] outputArray = output.GetArray();
// We could be tricky and use the first row in each set of multiple as the temporary storage,
// instead of allocating this separate array.
byte[] row = new byte[outputWidth];
// 1. Write the white lines at the top
for (int y = 0; y < topPadding; y++)
{
SetRowColor(outputArray[y], (byte)255);
}
// 2. Expand the QR image to the multiple
byte[][] inputArray = input.GetArray();
for (int y = 0; y < inputHeight; y++)
{
// a. Write the white pixels at the left of each row
for (int x = 0; x < leftPadding; x++)
{
row[x] = (byte)255;
}
// b. Write the contents of this row of the barcode
int offset = leftPadding;
for (int x = 0; x < inputWidth; x++)
{
byte value = (inputArray[y][x] == 1) ? (byte)0 : (byte)255;
for (int z = 0; z < multiple; z++)
{
row[offset + z] = value;
}
offset += multiple;
}
// c. Write the white pixels at the right of each row
offset = leftPadding + (inputWidth * multiple);
for (int x = offset; x < outputWidth; x++)
{
row[x] = (byte)255;
}
// d. Write the completed row multiple times
offset = topPadding + (y * multiple);
for (int z = 0; z < multiple; z++)
{
Array.Copy(row, 0, outputArray[offset + z], 0, outputWidth);
}
}
// 3. Write the white lines at the bottom
int offset_1 = topPadding + (inputHeight * multiple);
for (int y = offset_1; y < outputHeight; y++)
{
SetRowColor(outputArray[y], (byte)255);
}
return(output);
}
/// <exception cref="iText.Barcodes.Qrcode.WriterException"/>
public static void Encode(String content, ErrorCorrectionLevel ecLevel, IDictionary <EncodeHintType, Object
> hints, QRCode qrCode)
{
String encoding = hints == null ? null : (String)hints.Get(EncodeHintType.CHARACTER_SET);
if (encoding == null)
{
encoding = DEFAULT_BYTE_MODE_ENCODING;
}
// Step 1: Choose the mode (encoding).
Mode mode = ChooseMode(content, encoding);
// Step 2: Append "bytes" into "dataBits" in appropriate encoding.
BitVector dataBits = new BitVector();
AppendBytes(content, mode, dataBits, encoding);
// Step 3: Initialize QR code that can contain "dataBits".
int numInputBytes = dataBits.SizeInBytes();
InitQRCode(numInputBytes, ecLevel, mode, qrCode);
// Step 4: Build another bit vector that contains header and data.
BitVector headerAndDataBits = new BitVector();
// Step 4.5: Append ECI message if applicable
if (mode == Mode.BYTE && !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding))
{
CharacterSetECI eci = CharacterSetECI.GetCharacterSetECIByName(encoding);
if (eci != null)
{
AppendECI(eci, headerAndDataBits);
}
}
AppendModeInfo(mode, headerAndDataBits);
int numLetters = mode.Equals(Mode.BYTE) ? dataBits.SizeInBytes() : content.Length;
AppendLengthInfo(numLetters, qrCode.GetVersion(), mode, headerAndDataBits);
headerAndDataBits.AppendBitVector(dataBits);
// Step 5: Terminate the bits properly.
TerminateBits(qrCode.GetNumDataBytes(), headerAndDataBits);
// Step 6: Interleave data bits with error correction code.
BitVector finalBits = new BitVector();
InterleaveWithECBytes(headerAndDataBits, qrCode.GetNumTotalBytes(), qrCode.GetNumDataBytes(), qrCode.GetNumRSBlocks
(), finalBits);
// Step 7: Choose the mask pattern and set to "qrCode".
ByteMatrix matrix = new ByteMatrix(qrCode.GetMatrixWidth(), qrCode.GetMatrixWidth());
qrCode.SetMaskPattern(ChooseMaskPattern(finalBits, qrCode.GetECLevel(), qrCode.GetVersion(), matrix));
// Step 8. Build the matrix and set it to "qrCode".
MatrixUtil.BuildMatrix(finalBits, qrCode.GetECLevel(), qrCode.GetVersion(), qrCode.GetMaskPattern(), matrix
);
qrCode.SetMatrix(matrix);
// Step 9. Make sure we have a valid QR Code.
if (!qrCode.IsValid())
{
throw new WriterException("Invalid QR code: " + qrCode.ToString());
}
}
/// <summary>Encode "bytes" with the error correction level "ecLevel".</summary>
/// <remarks>
/// Encode "bytes" with the error correction level "ecLevel". The encoding mode will be chosen
/// internally by chooseMode(). On success, store the result in "qrCode".
/// We recommend you to use QRCode.EC_LEVEL_L (the lowest level) for
/// "getECLevel" since our primary use is to show QR code on desktop screens. We don't need very
/// strong error correction for this purpose.
/// Note that there is no way to encode bytes in MODE_KANJI. We might want to add EncodeWithMode()
/// with which clients can specify the encoding mode. For now, we don't need the functionality.
/// </remarks>
/// <exception cref="iText.Barcodes.Qrcode.WriterException"/>
public static void Encode(String content, ErrorCorrectionLevel ecLevel, QRCode qrCode)
{
Encode(content, ecLevel, null, qrCode);
}