Examples with Version com.google.zxing.qrcode.decoder.Version used on opensource projects

Example 1 with Version

use of com.google.zxing.qrcode.decoder.Version in project weex-example by KalicyZhou.

the class Encoder method encode.

public static QRCode encode(String content, ErrorCorrectionLevel ecLevel, Map<EncodeHintType, ?> hints) throws WriterException {
    // Determine what character encoding has been specified by the caller, if any
    String encoding = DEFAULT_BYTE_MODE_ENCODING;
    if (hints != null && hints.containsKey(EncodeHintType.CHARACTER_SET)) {
        encoding = hints.get(EncodeHintType.CHARACTER_SET).toString();
    }
    // Pick an encoding mode appropriate for the content. Note that this will not attempt to use
    // multiple modes / segments even if that were more efficient. Twould be nice.
    Mode mode = chooseMode(content, encoding);
    // This will store the header information, like mode and
    // length, as well as "header" segments like an ECI segment.
    BitArray headerBits = new BitArray();
    // Append ECI segment if applicable
    if (mode == Mode.BYTE && !DEFAULT_BYTE_MODE_ENCODING.equals(encoding)) {
        CharacterSetECI eci = CharacterSetECI.getCharacterSetECIByName(encoding);
        if (eci != null) {
            appendECI(eci, headerBits);
        }
    }
    // (With ECI in place,) Write the mode marker
    appendModeInfo(mode, headerBits);
    // Collect data within the main segment, separately, to count its size if needed. Don't add it to
    // main payload yet.
    BitArray dataBits = new BitArray();
    appendBytes(content, mode, dataBits, encoding);
    // Hard part: need to know version to know how many bits length takes. But need to know how many
    // bits it takes to know version. First we take a guess at version by assuming version will be
    // the minimum, 1:
    int provisionalBitsNeeded = headerBits.getSize() + mode.getCharacterCountBits(Version.getVersionForNumber(1)) + dataBits.getSize();
    Version provisionalVersion = chooseVersion(provisionalBitsNeeded, ecLevel);
    // Use that guess to calculate the right version. I am still not sure this works in 100% of cases.
    int bitsNeeded = headerBits.getSize() + mode.getCharacterCountBits(provisionalVersion) + dataBits.getSize();
    Version version = chooseVersion(bitsNeeded, ecLevel);
    BitArray headerAndDataBits = new BitArray();
    headerAndDataBits.appendBitArray(headerBits);
    // Find "length" of main segment and write it
    int numLetters = mode == Mode.BYTE ? dataBits.getSizeInBytes() : content.length();
    appendLengthInfo(numLetters, version, mode, headerAndDataBits);
    // Put data together into the overall payload
    headerAndDataBits.appendBitArray(dataBits);
    Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
    int numDataBytes = version.getTotalCodewords() - ecBlocks.getTotalECCodewords();
    // Terminate the bits properly.
    terminateBits(numDataBytes, headerAndDataBits);
    // Interleave data bits with error correction code.
    BitArray finalBits = interleaveWithECBytes(headerAndDataBits, version.getTotalCodewords(), numDataBytes, ecBlocks.getNumBlocks());
    QRCode qrCode = new QRCode();
    qrCode.setECLevel(ecLevel);
    qrCode.setMode(mode);
    qrCode.setVersion(version);
    //  Choose the mask pattern and set to "qrCode".
    int dimension = version.getDimensionForVersion();
    ByteMatrix matrix = new ByteMatrix(dimension, dimension);
    int maskPattern = chooseMaskPattern(finalBits, ecLevel, version, matrix);
    qrCode.setMaskPattern(maskPattern);
    // Build the matrix and set it to "qrCode".
    MatrixUtil.buildMatrix(finalBits, ecLevel, version, maskPattern, matrix);
    qrCode.setMatrix(matrix);
    return qrCode;
}

Example 2 with Version

use of com.google.zxing.qrcode.decoder.Version in project weex-example by KalicyZhou.

the class Encoder method chooseVersion.

private static Version chooseVersion(int numInputBits, ErrorCorrectionLevel ecLevel) throws WriterException {
    // In the following comments, we use numbers of Version 7-H.
    for (int versionNum = 1; 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();
        // getNumDataBytes = 196 - 130 = 66
        int numDataBytes = numBytes - numEcBytes;
        int totalInputBytes = (numInputBits + 7) / 8;
        if (numDataBytes >= totalInputBytes) {
            return version;
        }
    }
    throw new WriterException("Data too big");
}

Example 3 with Version

use of com.google.zxing.qrcode.decoder.Version in project weex-example by KalicyZhou.

the class Detector method processFinderPatternInfo.

protected final DetectorResult processFinderPatternInfo(FinderPatternInfo info) throws NotFoundException, FormatException {
    FinderPattern topLeft = info.getTopLeft();
    FinderPattern topRight = info.getTopRight();
    FinderPattern bottomLeft = info.getBottomLeft();
    float moduleSize = calculateModuleSize(topLeft, topRight, bottomLeft);
    if (moduleSize < 1.0f) {
        throw NotFoundException.getNotFoundInstance();
    }
    int dimension = computeDimension(topLeft, topRight, bottomLeft, moduleSize);
    Version provisionalVersion = Version.getProvisionalVersionForDimension(dimension);
    int modulesBetweenFPCenters = provisionalVersion.getDimensionForVersion() - 7;
    AlignmentPattern alignmentPattern = null;
    // Anything above version 1 has an alignment pattern
    if (provisionalVersion.getAlignmentPatternCenters().length > 0) {
        // Guess where a "bottom right" finder pattern would have been
        float bottomRightX = topRight.getX() - topLeft.getX() + bottomLeft.getX();
        float bottomRightY = topRight.getY() - topLeft.getY() + bottomLeft.getY();
        // Estimate that alignment pattern is closer by 3 modules
        // from "bottom right" to known top left location
        float correctionToTopLeft = 1.0f - 3.0f / (float) modulesBetweenFPCenters;
        int estAlignmentX = (int) (topLeft.getX() + correctionToTopLeft * (bottomRightX - topLeft.getX()));
        int estAlignmentY = (int) (topLeft.getY() + correctionToTopLeft * (bottomRightY - topLeft.getY()));
        // Kind of arbitrary -- expand search radius before giving up
        for (int i = 4; i <= 16; i <<= 1) {
            try {
                alignmentPattern = findAlignmentInRegion(moduleSize, estAlignmentX, estAlignmentY, (float) i);
                break;
            } catch (NotFoundException re) {
            // try next round
            }
        }
    // If we didn't find alignment pattern... well try anyway without it
    }
    PerspectiveTransform transform = createTransform(topLeft, topRight, bottomLeft, alignmentPattern, dimension);
    BitMatrix bits = sampleGrid(image, transform, dimension);
    ResultPoint[] points;
    if (alignmentPattern == null) {
        points = new ResultPoint[] { bottomLeft, topLeft, topRight };
    } else {
        points = new ResultPoint[] { bottomLeft, topLeft, topRight, alignmentPattern };
    }
    return new DetectorResult(bits, points);
}

Example 4 with Version

use of com.google.zxing.qrcode.decoder.Version in project zxing by zxing.

the class Encoder method encode.

public static QRCode encode(String content, ErrorCorrectionLevel ecLevel, Map<EncodeHintType, ?> hints) throws WriterException {
    // Determine what character encoding has been specified by the caller, if any
    String encoding = DEFAULT_BYTE_MODE_ENCODING;
    boolean hasEncodingHint = hints != null && hints.containsKey(EncodeHintType.CHARACTER_SET);
    if (hasEncodingHint) {
        encoding = hints.get(EncodeHintType.CHARACTER_SET).toString();
    }
    // Pick an encoding mode appropriate for the content. Note that this will not attempt to use
    // multiple modes / segments even if that were more efficient. Twould be nice.
    Mode mode = chooseMode(content, encoding);
    // This will store the header information, like mode and
    // length, as well as "header" segments like an ECI segment.
    BitArray headerBits = new BitArray();
    // Append ECI segment if applicable
    if (mode == Mode.BYTE && (hasEncodingHint || !DEFAULT_BYTE_MODE_ENCODING.equals(encoding))) {
        CharacterSetECI eci = CharacterSetECI.getCharacterSetECIByName(encoding);
        if (eci != null) {
            appendECI(eci, headerBits);
        }
    }
    // (With ECI in place,) Write the mode marker
    appendModeInfo(mode, headerBits);
    // Collect data within the main segment, separately, to count its size if needed. Don't add it to
    // main payload yet.
    BitArray dataBits = new BitArray();
    appendBytes(content, mode, dataBits, encoding);
    Version version;
    if (hints != null && hints.containsKey(EncodeHintType.QR_VERSION)) {
        int versionNumber = Integer.parseInt(hints.get(EncodeHintType.QR_VERSION).toString());
        version = Version.getVersionForNumber(versionNumber);
        int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, version);
        if (!willFit(bitsNeeded, version, ecLevel)) {
            throw new WriterException("Data too big for requested version");
        }
    } else {
        version = recommendVersion(ecLevel, mode, headerBits, dataBits);
    }
    BitArray headerAndDataBits = new BitArray();
    headerAndDataBits.appendBitArray(headerBits);
    // Find "length" of main segment and write it
    int numLetters = mode == Mode.BYTE ? dataBits.getSizeInBytes() : content.length();
    appendLengthInfo(numLetters, version, mode, headerAndDataBits);
    // Put data together into the overall payload
    headerAndDataBits.appendBitArray(dataBits);
    Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
    int numDataBytes = version.getTotalCodewords() - ecBlocks.getTotalECCodewords();
    // Terminate the bits properly.
    terminateBits(numDataBytes, headerAndDataBits);
    // Interleave data bits with error correction code.
    BitArray finalBits = interleaveWithECBytes(headerAndDataBits, version.getTotalCodewords(), numDataBytes, ecBlocks.getNumBlocks());
    QRCode qrCode = new QRCode();
    qrCode.setECLevel(ecLevel);
    qrCode.setMode(mode);
    qrCode.setVersion(version);
    //  Choose the mask pattern and set to "qrCode".
    int dimension = version.getDimensionForVersion();
    ByteMatrix matrix = new ByteMatrix(dimension, dimension);
    int maskPattern = chooseMaskPattern(finalBits, ecLevel, version, matrix);
    qrCode.setMaskPattern(maskPattern);
    // Build the matrix and set it to "qrCode".
    MatrixUtil.buildMatrix(finalBits, ecLevel, version, maskPattern, matrix);
    qrCode.setMatrix(matrix);
    return qrCode;
}

Example 5 with Version

use of com.google.zxing.qrcode.decoder.Version in project zxing by zxing.

the class Detector method processFinderPatternInfo.

protected final DetectorResult processFinderPatternInfo(FinderPatternInfo info) throws NotFoundException, FormatException {
    FinderPattern topLeft = info.getTopLeft();
    FinderPattern topRight = info.getTopRight();
    FinderPattern bottomLeft = info.getBottomLeft();
    float moduleSize = calculateModuleSize(topLeft, topRight, bottomLeft);
    if (moduleSize < 1.0f) {
        throw NotFoundException.getNotFoundInstance();
    }
    int dimension = computeDimension(topLeft, topRight, bottomLeft, moduleSize);
    Version provisionalVersion = Version.getProvisionalVersionForDimension(dimension);
    int modulesBetweenFPCenters = provisionalVersion.getDimensionForVersion() - 7;
    AlignmentPattern alignmentPattern = null;
    // Anything above version 1 has an alignment pattern
    if (provisionalVersion.getAlignmentPatternCenters().length > 0) {
        // Guess where a "bottom right" finder pattern would have been
        float bottomRightX = topRight.getX() - topLeft.getX() + bottomLeft.getX();
        float bottomRightY = topRight.getY() - topLeft.getY() + bottomLeft.getY();
        // Estimate that alignment pattern is closer by 3 modules
        // from "bottom right" to known top left location
        float correctionToTopLeft = 1.0f - 3.0f / modulesBetweenFPCenters;
        int estAlignmentX = (int) (topLeft.getX() + correctionToTopLeft * (bottomRightX - topLeft.getX()));
        int estAlignmentY = (int) (topLeft.getY() + correctionToTopLeft * (bottomRightY - topLeft.getY()));
        // Kind of arbitrary -- expand search radius before giving up
        for (int i = 4; i <= 16; i <<= 1) {
            try {
                alignmentPattern = findAlignmentInRegion(moduleSize, estAlignmentX, estAlignmentY, i);
                break;
            } catch (NotFoundException re) {
            // try next round
            }
        }
    // If we didn't find alignment pattern... well try anyway without it
    }
    PerspectiveTransform transform = createTransform(topLeft, topRight, bottomLeft, alignmentPattern, dimension);
    BitMatrix bits = sampleGrid(image, transform, dimension);
    ResultPoint[] points;
    if (alignmentPattern == null) {
        points = new ResultPoint[] { bottomLeft, topLeft, topRight };
    } else {
        points = new ResultPoint[] { bottomLeft, topLeft, topRight, alignmentPattern };
    }
    return new DetectorResult(bits, points);
}