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); }