private static int ChooseMaskPattern(BitVector bits, ErrorCorrectionLevel ecLevel, int version,
ByteMatrix matrix)
{
int minPenalty = int.MaxValue; // Lower penalty is better.
int bestMaskPattern = -1;
// We try all mask patterns to choose the best one.
for (int maskPattern = 0; maskPattern < QRCode.NUM_MASK_PATTERNS; maskPattern++)
{
MatrixUtil.BuildMatrix(bits, ecLevel, version, maskPattern, matrix);
int penalty = CalculateMaskPenalty(matrix);
if (penalty < minPenalty)
{
minPenalty = penalty;
bestMaskPattern = maskPattern;
}
}
return(bestMaskPattern);
}
private static void EmbedPositionDetectionPattern(int xStart, int yStart,
ByteMatrix matrix)
{
// We know the width and height.
if (POSITION_DETECTION_PATTERN[0].Length != 7 || POSITION_DETECTION_PATTERN.GetLength(0) != 7)
{
throw new WriterException("Bad position detection pattern");
}
for (int y = 0; y < 7; ++y)
{
for (int x = 0; x < 7; ++x)
{
if (!IsEmpty(matrix.Get(xStart + x, yStart + y)))
{
throw new WriterException();
}
matrix.Set(xStart + x, yStart + y, POSITION_DETECTION_PATTERN[y][x]);
}
}
}
// Note that we cannot unify the function with EmbedPositionDetectionPattern() despite they are
// almost identical, since we cannot write a function that takes 2D arrays in different sizes in
// C/C++. We should live with the fact.
private static void EmbedPositionAdjustmentPattern(int xStart, int yStart,
ByteMatrix matrix)
{
// We know the width and height.
if (POSITION_ADJUSTMENT_PATTERN[0].Length != 5 || POSITION_ADJUSTMENT_PATTERN.GetLength(0) != 5)
{
throw new WriterException("Bad position adjustment");
}
for (int y = 0; y < 5; ++y)
{
for (int x = 0; x < 5; ++x)
{
if (!IsEmpty(matrix.Get(xStart + x, yStart + y)))
{
throw new WriterException();
}
matrix.Set(xStart + x, yStart + y, POSITION_ADJUSTMENT_PATTERN[y][x]);
}
}
}
// Apply mask penalty rule 2 and return the penalty. Find 2x2 blocks with the same color and give
// penalty to them.
public static int ApplyMaskPenaltyRule2(ByteMatrix matrix)
{
int penalty = 0;
sbyte[][] array = matrix.GetArray();
int width = matrix.GetWidth();
int height = matrix.GetHeight();
for (int y = 0; y < height - 1; ++y)
{
for (int x = 0; x < width - 1; ++x)
{
int value = array[y][x];
if (value == array[y][x + 1] && value == array[y + 1][x] && value == array[y + 1][x + 1])
{
penalty += 3;
}
}
}
return(penalty);
}
// Apply mask penalty rule 4 and return the penalty. Calculate the ratio of dark cells and give
// penalty if the ratio is far from 50%. It gives 10 penalty for 5% distance. Examples:
// - 0% => 100
// - 40% => 20
// - 45% => 10
// - 50% => 0
// - 55% => 10
// - 55% => 20
// - 100% => 100
public static int ApplyMaskPenaltyRule4(ByteMatrix matrix)
{
int numDarkCells = 0;
sbyte[][] array = matrix.GetArray();
int width = matrix.GetWidth();
int height = matrix.GetHeight();
for (int y = 0; y < height; ++y)
{
for (int x = 0; x < width; ++x)
{
if (array[y][x] == 1)
{
numDarkCells += 1;
}
}
}
int numTotalCells = matrix.GetHeight() * matrix.GetWidth();
double darkRatio = (double)numDarkCells / numTotalCells;
return(Math.Abs((int)(darkRatio * 100 - 50)) / 5 * 10);
}
// This takes ownership of the 2D array.
public void SetMatrix(ByteMatrix value)
{
matrix = value;
}
// Apply mask penalty rule 1 and return the penalty. Find repetitive cells with the same color and
// give penalty to them. Example: 00000 or 11111.
public static int ApplyMaskPenaltyRule1(ByteMatrix matrix)
{
return(ApplyMaskPenaltyRule1Internal(matrix, true) + ApplyMaskPenaltyRule1Internal(matrix, false));
}
// Embed type information. On success, modify the matrix.
public static void EmbedTypeInfo(ErrorCorrectionLevel ecLevel, int maskPattern, ByteMatrix matrix)
{
BitVector typeInfoBits = new BitVector();
MakeTypeInfoBits(ecLevel, maskPattern, typeInfoBits);
for (int i = 0; i < typeInfoBits.Size(); ++i)
{
// Place bits in LSB to MSB order. LSB (least significant bit) is the last value in
// "typeInfoBits".
int bit = typeInfoBits.At(typeInfoBits.Size() - 1 - i);
// Type info bits at the left top corner. See 8.9 of JISX0510:2004 (p.46).
int x1 = TYPE_INFO_COORDINATES[i][0];
int y1 = TYPE_INFO_COORDINATES[i][1];
matrix.Set(x1, y1, bit);
if (i < 8)
{
// Right top corner.
int x2 = matrix.GetWidth() - i - 1;
int y2 = 8;
matrix.Set(x2, y2, bit);
}
else
{
// Left bottom corner.
int x2 = 8;
int y2 = matrix.GetHeight() - 7 + (i - 8);
matrix.Set(x2, y2, bit);
}
}
}
// Set all cells to -1. -1 means that the cell is empty (not set yet).
//
// JAVAPORT: We shouldn't need to do this at all. The code should be rewritten to begin encoding
// with the ByteMatrix initialized all to zero.
public static void ClearMatrix(ByteMatrix matrix)
{
matrix.Clear((sbyte)-1);
}
/**
* Creates the QR barcode. The barcode is always created with the smallest possible size and is then stretched
* to the width and height given. Set the width and height to 1 to get an unscaled barcode.
* @param content the text to be encoded
* @param width the barcode width
* @param height the barcode height
* @param hints modifiers to change the way the barcode is create. They can be EncodeHintType.ERROR_CORRECTION
* and EncodeHintType.CHARACTER_SET. For EncodeHintType.ERROR_CORRECTION the values can be ErrorCorrectionLevel.L, M, Q, H.
* For EncodeHintType.CHARACTER_SET the values are strings and can be Cp437, Shift_JIS and ISO-8859-1 to ISO-8859-16.
* You can also use UTF-8, but correct behaviour is not guaranteed as Unicode is not supported in QRCodes.
* The default value is ISO-8859-1.
* @throws WriterException
*/
public BarcodeQRCode(String content, int width, int height, IDictionary <EncodeHintType, Object> hints)
{
QRCodeWriter qc = new QRCodeWriter();
bm = qc.Encode(content, width, height, hints);
}
public static void Encode(String content, ErrorCorrectionLevel ecLevel, IDictionary <EncodeHintType, Object> hints,
QRCode qrCode)
{
String encoding = null;
if (hints != null && hints.ContainsKey(EncodeHintType.CHARACTER_SET))
{
encoding = (string)hints[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());
}
}
// 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);
sbyte[][] 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.
sbyte[] row = new sbyte[outputWidth];
// 1. Write the white lines at the top
for (int y = 0; y < topPadding; y++)
{
SetRowColor(outputArray[y], (sbyte)-1);
}
// 2. Expand the QR image to the multiple
sbyte[][] 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] = (sbyte)-1;
}
// b. Write the contents of this row of the barcode
int offset = leftPadding;
for (int x = 0; x < inputWidth; x++)
{
sbyte value = (inputArray[y][x] == 1) ? (sbyte)0 : (sbyte)-1;
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] = (sbyte)-1;
}
// d. Write the completed row multiple times
offset = topPadding + (y * multiple);
for (int z = 0; z < multiple; z++)
{
System.Array.Copy(row, 0, outputArray[offset + z], 0, outputWidth);
}
}
// 3. Write the white lines at the bottom
int offset2 = topPadding + (inputHeight * multiple);
for (int y = offset2; y < outputHeight; y++)
{
SetRowColor(outputArray[y], (sbyte)-1);
}
return(output);
}
