awesome-qr-node.js

/**
 *  Awesome-qr.js
 *      https://github.com/SumiMakito/Awesome-qr.js
 *
 *  Copyright © 2017 Makito <master@keep.moe>, https://www.keep.moe/
 *
 *  Licensed under Apache License 2.0 License.
 *  Copyright (c) 2017 Makito, https://www.keep.moe
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @fileoverview
 * - Using the 'QRCode for Javascript library'
 * - Fixed dataset of 'QRCode for Javascript library' for support full-spec.
 * - this library has no dependencies.
 *
 * @author davidshimjs
 * @see <a href="http://www.d-project.com/" target="_blank">http://www.d-project.com/</a>
 * @see <a href="http://jeromeetienne.github.com/jquery-qrcode/" target="_blank">http://jeromeetienne.github.com/jquery-qrcode/</a>
 */
let fs = require('fs');
let http = require('http');
let url = require('url');
let Canvas = require('canvas-prebuilt');
let Image = Canvas.Image;
let request = require('request');

var AwesomeQRCode;

// QR CODE CORE LIBRARY DEFINITION START
// SHOULD NOT BE MODIFIED
//
// QRCode for JavaScript
//
// Copyright (c) 2009 Kazuhiko Arase
//
// URL: http://www.d-project.com/
//
// Licensed under the MIT license:
//   http://www.opensource.org/licenses/mit-license.php
//
// The word "QR Code" is registered trademark of DENSO WAVE INCORPORATED
//   http://www.denso-wave.com/qrcode/faqpatent-e.html
//

function QR8bitByte(data) {
    this.mode = QRMode.MODE_8BIT_BYTE;
    this.data = data;
    this.parsedData = [];
    for (var i = 0, l = this.data.length; i < l; i++) {
        var byteArray = [];
        var code = this.data.charCodeAt(i);
        if (code > 0x10000) {
            byteArray[0] = 0xF0 | ((code & 0x1C0000) >>> 18);
            byteArray[1] = 0x80 | ((code & 0x3F000) >>> 12);
            byteArray[2] = 0x80 | ((code & 0xFC0) >>> 6);
            byteArray[3] = 0x80 | (code & 0x3F)
        } else if (code > 0x800) {
            byteArray[0] = 0xE0 | ((code & 0xF000) >>> 12);
            byteArray[1] = 0x80 | ((code & 0xFC0) >>> 6);
            byteArray[2] = 0x80 | (code & 0x3F)
        } else if (code > 0x80) {
            byteArray[0] = 0xC0 | ((code & 0x7C0) >>> 6);
            byteArray[1] = 0x80 | (code & 0x3F)
        } else {
            byteArray[0] = code
        }
        this.parsedData.push(byteArray)
    }
    this.parsedData = Array.prototype.concat.apply([], this.parsedData);
    if (this.parsedData.length != this.data.length) {
        this.parsedData.unshift(191);
        this.parsedData.unshift(187);
        this.parsedData.unshift(239)
    }
}

QR8bitByte.prototype = {
    getLength: function(buffer) {
        return this.parsedData.length
    },
    write: function(buffer) {
        for (var i = 0, l = this.parsedData.length; i < l; i++) {
            buffer.put(this.parsedData[i], 8)
        }
    }
};

function QRCodeModel(typeNumber, errorCorrectLevel) {
    this.typeNumber = typeNumber;
    this.errorCorrectLevel = errorCorrectLevel;
    this.modules = null;
    this.moduleCount = 0;
    this.dataCache = null;
    this.dataList = []
}

QRCodeModel.prototype = {
    addData: function(data) {
        var newData = new QR8bitByte(data);
        this.dataList.push(newData);
        this.dataCache = null
    },
    isDark: function(row, col) {
        if (row < 0 || this.moduleCount <= row || col < 0 || this.moduleCount <= col) {
            throw new Error(row + "," + col)
        }
        return this.modules[row][col]
    },
    getModuleCount: function() {
        return this.moduleCount
    },
    make: function() {
        /////////////////////////////////////////////
        if (this.typeNumber < 1) {
            var typeNumber = 1;
            for (typeNumber = 1; typeNumber < 40; typeNumber++) {
                var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, this.errorCorrectLevel);

                var buffer = new QRBitBuffer();
                var totalDataCount = 0;
                for (var i = 0; i < rsBlocks.length; i++) {
                    totalDataCount += rsBlocks[i].dataCount;
                }

                for (var i = 0; i < this.dataList.length; i++) {
                    var data = this.dataList[i];
                    buffer.put(data.mode, 4);
                    buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber));
                    data.write(buffer);
                }
                if (buffer.getLengthInBits() <= totalDataCount * 8)
                    break;
            }
            this.typeNumber = typeNumber;
        }
        /////////////////////////////////////////////
        this.makeImpl(!1, this.getBestMaskPattern())
    },
    makeImpl: function(test, maskPattern) {
        this.moduleCount = this.typeNumber * 4 + 17;
        this.modules = new Array(this.moduleCount);
        for (var row = 0; row < this.moduleCount; row++) {
            this.modules[row] = new Array(this.moduleCount);
            for (var col = 0; col < this.moduleCount; col++) {
                this.modules[row][col] = null
            }
        }
        this.setupPositionProbePattern(0, 0);
        this.setupPositionProbePattern(this.moduleCount - 7, 0);
        this.setupPositionProbePattern(0, this.moduleCount - 7);
        this.setupPositionAdjustPattern();
        this.setupTimingPattern();
        this.setupTypeInfo(test, maskPattern);
        if (this.typeNumber >= 7) {
            this.setupTypeNumber(test)
        }
        if (this.dataCache == null) {
            this.dataCache = QRCodeModel.createData(this.typeNumber, this.errorCorrectLevel, this.dataList)
        }
        this.mapData(this.dataCache, maskPattern)
    },
    setupPositionProbePattern: function(row, col) {
        for (var r = -1; r <= 7; r++) {
            if (row + r <= -1 || this.moduleCount <= row + r) continue;
            for (var c = -1; c <= 7; c++) {
                if (col + c <= -1 || this.moduleCount <= col + c) continue;
                if ((0 <= r && r <= 6 && (c == 0 || c == 6)) || (0 <= c && c <= 6 && (r == 0 || r == 6)) || (2 <= r && r <= 4 && 2 <= c && c <= 4)) {
                    this.modules[row + r][col + c] = !0
                } else {
                    this.modules[row + r][col + c] = !1
                }
            }
        }
    },
    getBestMaskPattern: function() {
        var minLostPoint = 0;
        var pattern = 0;
        for (var i = 0; i < 8; i++) {
            this.makeImpl(!0, i);
            var lostPoint = QRUtil.getLostPoint(this);
            if (i == 0 || minLostPoint > lostPoint) {
                minLostPoint = lostPoint;
                pattern = i
            }
        }
        return pattern
    },
    createMovieClip: function(target_mc, instance_name, depth) {
        var qr_mc = target_mc.createEmptyMovieClip(instance_name, depth);
        var cs = 1;
        this.make();
        for (var row = 0; row < this.modules.length; row++) {
            var y = row * cs;
            for (var col = 0; col < this.modules[row].length; col++) {
                var x = col * cs;
                var dark = this.modules[row][col];
                if (dark) {
                    qr_mc.beginFill(0, 100);
                    qr_mc.moveTo(x, y);
                    qr_mc.lineTo(x + cs, y);
                    qr_mc.lineTo(x + cs, y + cs);
                    qr_mc.lineTo(x, y + cs);
                    qr_mc.endFill()
                }
            }
        }
        return qr_mc
    },
    setupTimingPattern: function() {
        for (var r = 8; r < this.moduleCount - 8; r++) {
            if (this.modules[r][6] != null) {
                continue
            }
            this.modules[r][6] = (r % 2 == 0)
        }
        for (var c = 8; c < this.moduleCount - 8; c++) {
            if (this.modules[6][c] != null) {
                continue
            }
            this.modules[6][c] = (c % 2 == 0)
        }
    },
    setupPositionAdjustPattern: function() {
        var pos = QRUtil.getPatternPosition(this.typeNumber);
        for (var i = 0; i < pos.length; i++) {
            for (var j = 0; j < pos.length; j++) {
                var row = pos[i];
                var col = pos[j];
                if (this.modules[row][col] != null) {
                    continue
                }
                for (var r = -2; r <= 2; r++) {
                    for (var c = -2; c <= 2; c++) {
                        if (r == -2 || r == 2 || c == -2 || c == 2 || (r == 0 && c == 0)) {
                            this.modules[row + r][col + c] = !0
                        } else {
                            this.modules[row + r][col + c] = !1
                        }
                    }
                }
            }
        }
    },
    setupTypeNumber: function(test) {
        var bits = QRUtil.getBCHTypeNumber(this.typeNumber);
        for (var i = 0; i < 18; i++) {
            var mod = (!test && ((bits >> i) & 1) == 1);
            this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod
        }
        for (var i = 0; i < 18; i++) {
            var mod = (!test && ((bits >> i) & 1) == 1);
            this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod
        }
    },
    setupTypeInfo: function(test, maskPattern) {
        var data = (this.errorCorrectLevel << 3) | maskPattern;
        var bits = QRUtil.getBCHTypeInfo(data);
        for (var i = 0; i < 15; i++) {
            var mod = (!test && ((bits >> i) & 1) == 1);
            if (i < 6) {
                this.modules[i][8] = mod
            } else if (i < 8) {
                this.modules[i + 1][8] = mod
            } else {
                this.modules[this.moduleCount - 15 + i][8] = mod
            }
        }
        for (var i = 0; i < 15; i++) {
            var mod = (!test && ((bits >> i) & 1) == 1);
            if (i < 8) {
                this.modules[8][this.moduleCount - i - 1] = mod
            } else if (i < 9) {
                this.modules[8][15 - i - 1 + 1] = mod
            } else {
                this.modules[8][15 - i - 1] = mod
            }
        }
        this.modules[this.moduleCount - 8][8] = (!test)
    },
    mapData: function(data, maskPattern) {
        var inc = -1;
        var row = this.moduleCount - 1;
        var bitIndex = 7;
        var byteIndex = 0;
        for (var col = this.moduleCount - 1; col > 0; col -= 2) {
            if (col == 6) col--;
            while (!0) {
                for (var c = 0; c < 2; c++) {
                    if (this.modules[row][col - c] == null) {
                        var dark = !1;
                        if (byteIndex < data.length) {
                            dark = (((data[byteIndex] >>> bitIndex) & 1) == 1)
                        }
                        var mask = QRUtil.getMask(maskPattern, row, col - c);
                        if (mask) {
                            dark = !dark
                        }
                        this.modules[row][col - c] = dark;
                        bitIndex--;
                        if (bitIndex == -1) {
                            byteIndex++;
                            bitIndex = 7
                        }
                    }
                }
                row += inc;
                if (row < 0 || this.moduleCount <= row) {
                    row -= inc;
                    inc = -inc;
                    break
                }
            }
        }
    }
};
QRCodeModel.PAD0 = 0xEC;
QRCodeModel.PAD1 = 0x11;
QRCodeModel.createData = function(typeNumber, errorCorrectLevel, dataList) {
    var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);
    var buffer = new QRBitBuffer();
    for (var i = 0; i < dataList.length; i++) {
        var data = dataList[i];
        buffer.put(data.mode, 4);
        buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber));
        data.write(buffer)
    }
    var totalDataCount = 0;
    for (var i = 0; i < rsBlocks.length; i++) {
        totalDataCount += rsBlocks[i].dataCount
    }
    if (buffer.getLengthInBits() > totalDataCount * 8) {
        throw new Error("code length overflow. (" + buffer.getLengthInBits() + ">" + totalDataCount * 8 + ")")
    }
    if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
        buffer.put(0, 4)
    }
    while (buffer.getLengthInBits() % 8 != 0) {
        buffer.putBit(!1)
    }
    while (!0) {
        if (buffer.getLengthInBits() >= totalDataCount * 8) {
            break
        }
        buffer.put(QRCodeModel.PAD0, 8);
        if (buffer.getLengthInBits() >= totalDataCount * 8) {
            break
        }
        buffer.put(QRCodeModel.PAD1, 8)
    }
    return QRCodeModel.createBytes(buffer, rsBlocks)
};
QRCodeModel.createBytes = function(buffer, rsBlocks) {
    var offset = 0;
    var maxDcCount = 0;
    var maxEcCount = 0;
    var dcdata = new Array(rsBlocks.length);
    var ecdata = new Array(rsBlocks.length);
    for (var r = 0; r < rsBlocks.length; r++) {
        var dcCount = rsBlocks[r].dataCount;
        var ecCount = rsBlocks[r].totalCount - dcCount;
        maxDcCount = Math.max(maxDcCount, dcCount);
        maxEcCount = Math.max(maxEcCount, ecCount);
        dcdata[r] = new Array(dcCount);
        for (var i = 0; i < dcdata[r].length; i++) {
            dcdata[r][i] = 0xff & buffer.buffer[i + offset]
        }
        offset += dcCount;
        var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
        var rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1);
        var modPoly = rawPoly.mod(rsPoly);
        ecdata[r] = new Array(rsPoly.getLength() - 1);
        for (var i = 0; i < ecdata[r].length; i++) {
            var modIndex = i + modPoly.getLength() - ecdata[r].length;
            ecdata[r][i] = (modIndex >= 0) ? modPoly.get(modIndex) : 0
        }
    }
    var totalCodeCount = 0;
    for (var i = 0; i < rsBlocks.length; i++) {
        totalCodeCount += rsBlocks[i].totalCount
    }
    var data = new Array(totalCodeCount);
    var index = 0;
    for (var i = 0; i < maxDcCount; i++) {
        for (var r = 0; r < rsBlocks.length; r++) {
            if (i < dcdata[r].length) {
                data[index++] = dcdata[r][i]
            }
        }
    }
    for (var i = 0; i < maxEcCount; i++) {
        for (var r = 0; r < rsBlocks.length; r++) {
            if (i < ecdata[r].length) {
                data[index++] = ecdata[r][i]
            }
        }
    }
    return data
};
var QRMode = { MODE_NUMBER: 1 << 0, MODE_ALPHA_NUM: 1 << 1, MODE_8BIT_BYTE: 1 << 2, MODE_KANJI: 1 << 3 };
var QRErrorCorrectLevel = { L: 1, M: 0, Q: 3, H: 2 };
var QRMaskPattern = {
    PATTERN000: 0,
    PATTERN001: 1,
    PATTERN010: 2,
    PATTERN011: 3,
    PATTERN100: 4,
    PATTERN101: 5,
    PATTERN110: 6,
    PATTERN111: 7
};
var QRUtil = {
    PATTERN_POSITION_TABLE: [
        [],
        [6, 18],
        [6, 22],
        [6, 26],
        [6, 30],
        [6, 34],
        [6, 22, 38],
        [6, 24, 42],
        [6, 26, 46],
        [6, 28, 50],
        [6, 30, 54],
        [6, 32, 58],
        [6, 34, 62],
        [6, 26, 46, 66],
        [6, 26, 48, 70],
        [6, 26, 50, 74],
        [6, 30, 54, 78],
        [6, 30, 56, 82],
        [6, 30, 58, 86],
        [6, 34, 62, 90],
        [6, 28, 50, 72, 94],
        [6, 26, 50, 74, 98],
        [6, 30, 54, 78, 102],
        [6, 28, 54, 80, 106],
        [6, 32, 58, 84, 110],
        [6, 30, 58, 86, 114],
        [6, 34, 62, 90, 118],
        [6, 26, 50, 74, 98, 122],
        [6, 30, 54, 78, 102, 126],
        [6, 26, 52, 78, 104, 130],
        [6, 30, 56, 82, 108, 134],
        [6, 34, 60, 86, 112, 138],
        [6, 30, 58, 86, 114, 142],
        [6, 34, 62, 90, 118, 146],
        [6, 30, 54, 78, 102, 126, 150],
        [6, 24, 50, 76, 102, 128, 154],
        [6, 28, 54, 80, 106, 132, 158],
        [6, 32, 58, 84, 110, 136, 162],
        [6, 26, 54, 82, 110, 138, 166],
        [6, 30, 58, 86, 114, 142, 170]
    ],
    G15: (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0),
    G18: (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0),
    G15_MASK: (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1),
    getBCHTypeInfo: function(data) {
        var d = data << 10;
        while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {
            d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15)))
        }
        return ((data << 10) | d) ^ QRUtil.G15_MASK
    },
    getBCHTypeNumber: function(data) {
        var d = data << 12;
        while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {
            d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18)))
        }
        return (data << 12) | d
    },
    getBCHDigit: function(data) {
        var digit = 0;
        while (data != 0) {
            digit++;
            data >>>= 1
        }
        return digit
    },
    getPatternPosition: function(typeNumber) {
        return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1]
    },
    getMask: function(maskPattern, i, j) {
        switch (maskPattern) {
            case QRMaskPattern.PATTERN000:
                return (i + j) % 2 == 0;
            case QRMaskPattern.PATTERN001:
                return i % 2 == 0;
            case QRMaskPattern.PATTERN010:
                return j % 3 == 0;
            case QRMaskPattern.PATTERN011:
                return (i + j) % 3 == 0;
            case QRMaskPattern.PATTERN100:
                return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;
            case QRMaskPattern.PATTERN101:
                return (i * j) % 2 + (i * j) % 3 == 0;
            case QRMaskPattern.PATTERN110:
                return ((i * j) % 2 + (i * j) % 3) % 2 == 0;
            case QRMaskPattern.PATTERN111:
                return ((i * j) % 3 + (i + j) % 2) % 2 == 0;
            default:
                throw new Error("bad maskPattern:" + maskPattern)
        }
    },
    getErrorCorrectPolynomial: function(errorCorrectLength) {
        var a = new QRPolynomial([1], 0);
        for (var i = 0; i < errorCorrectLength; i++) {
            a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0))
        }
        return a
    },
    getLengthInBits: function(mode, type) {
        if (1 <= type && type < 10) {
            switch (mode) {
                case QRMode.MODE_NUMBER:
                    return 10;
                case QRMode.MODE_ALPHA_NUM:
                    return 9;
                case QRMode.MODE_8BIT_BYTE:
                    return 8;
                case QRMode.MODE_KANJI:
                    return 8;
                default:
                    throw new Error("mode:" + mode)
            }
        } else if (type < 27) {
            switch (mode) {
                case QRMode.MODE_NUMBER:
                    return 12;
                case QRMode.MODE_ALPHA_NUM:
                    return 11;
                case QRMode.MODE_8BIT_BYTE:
                    return 16;
                case QRMode.MODE_KANJI:
                    return 10;
                default:
                    throw new Error("mode:" + mode)
            }
        } else if (type < 41) {
            switch (mode) {
                case QRMode.MODE_NUMBER:
                    return 14;
                case QRMode.MODE_ALPHA_NUM:
                    return 13;
                case QRMode.MODE_8BIT_BYTE:
                    return 16;
                case QRMode.MODE_KANJI:
                    return 12;
                default:
                    throw new Error("mode:" + mode)
            }
        } else {
            throw new Error("type:" + type)
        }
    },
    getLostPoint: function(qrCode) {
        var moduleCount = qrCode.getModuleCount();
        var lostPoint = 0;
        for (var row = 0; row < moduleCount; row++) {
            for (var col = 0; col < moduleCount; col++) {
                var sameCount = 0;
                var dark = qrCode.isDark(row, col);
                for (var r = -1; r <= 1; r++) {
                    if (row + r < 0 || moduleCount <= row + r) {
                        continue
                    }
                    for (var c = -1; c <= 1; c++) {
                        if (col + c < 0 || moduleCount <= col + c) {
                            continue
                        }
                        if (r == 0 && c == 0) {
                            continue
                        }
                        if (dark == qrCode.isDark(row + r, col + c)) {
                            sameCount++
                        }
                    }
                }
                if (sameCount > 5) {
                    lostPoint += (3 + sameCount - 5)
                }
            }
        }
        for (var row = 0; row < moduleCount - 1; row++) {
            for (var col = 0; col < moduleCount - 1; col++) {
                var count = 0;
                if (qrCode.isDark(row, col)) count++;
                if (qrCode.isDark(row + 1, col)) count++;
                if (qrCode.isDark(row, col + 1)) count++;
                if (qrCode.isDark(row + 1, col + 1)) count++;
                if (count == 0 || count == 4) {
                    lostPoint += 3
                }
            }
        }
        for (var row = 0; row < moduleCount; row++) {
            for (var col = 0; col < moduleCount - 6; col++) {
                if (qrCode.isDark(row, col) && !qrCode.isDark(row, col + 1) && qrCode.isDark(row, col + 2) && qrCode.isDark(row, col + 3) && qrCode.isDark(row, col + 4) && !qrCode.isDark(row, col + 5) && qrCode.isDark(row, col + 6)) {
                    lostPoint += 40
                }
            }
        }
        for (var col = 0; col < moduleCount; col++) {
            for (var row = 0; row < moduleCount - 6; row++) {
                if (qrCode.isDark(row, col) && !qrCode.isDark(row + 1, col) && qrCode.isDark(row + 2, col) && qrCode.isDark(row + 3, col) && qrCode.isDark(row + 4, col) && !qrCode.isDark(row + 5, col) && qrCode.isDark(row + 6, col)) {
                    lostPoint += 40
                }
            }
        }
        var darkCount = 0;
        for (var col = 0; col < moduleCount; col++) {
            for (var row = 0; row < moduleCount; row++) {
                if (qrCode.isDark(row, col)) {
                    darkCount++
                }
            }
        }
        var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
        lostPoint += ratio * 10;
        return lostPoint
    }
};
var QRMath = {
    glog: function(n) {
        if (n < 1) {
            throw new Error("glog(" + n + ")")
        }
        return QRMath.LOG_TABLE[n]
    },
    gexp: function(n) {
        while (n < 0) {
            n += 255
        }
        while (n >= 256) {
            n -= 255
        }
        return QRMath.EXP_TABLE[n]
    },
    EXP_TABLE: new Array(256),
    LOG_TABLE: new Array(256)
};
for (var i = 0; i < 8; i++) {
    QRMath.EXP_TABLE[i] = 1 << i
}
for (var i = 8; i < 256; i++) {
    QRMath.EXP_TABLE[i] = QRMath.EXP_TABLE[i - 4] ^ QRMath.EXP_TABLE[i - 5] ^ QRMath.EXP_TABLE[i - 6] ^ QRMath.EXP_TABLE[i - 8]
}
for (var i = 0; i < 255; i++) {
    QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i
}

function QRPolynomial(num, shift) {
    if (num.length == undefined) {
        throw new Error(num.length + "/" + shift)
    }
    var offset = 0;
    while (offset < num.length && num[offset] == 0) {
        offset++
    }
    this.num = new Array(num.length - offset + shift);
    for (var i = 0; i < num.length - offset; i++) {
        this.num[i] = num[i + offset]
    }
}

QRPolynomial.prototype = {
    get: function(index) {
        return this.num[index]
    },
    getLength: function() {
        return this.num.length
    },
    multiply: function(e) {
        var num = new Array(this.getLength() + e.getLength() - 1);
        for (var i = 0; i < this.getLength(); i++) {
            for (var j = 0; j < e.getLength(); j++) {
                num[i + j] ^= QRMath.gexp(QRMath.glog(this.get(i)) + QRMath.glog(e.get(j)))
            }
        }
        return new QRPolynomial(num, 0)
    },
    mod: function(e) {
        if (this.getLength() - e.getLength() < 0) {
            return this
        }
        var ratio = QRMath.glog(this.get(0)) - QRMath.glog(e.get(0));
        var num = new Array(this.getLength());
        for (var i = 0; i < this.getLength(); i++) {
            num[i] = this.get(i)
        }
        for (var i = 0; i < e.getLength(); i++) {
            num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio)
        }
        return new QRPolynomial(num, 0).mod(e)
    }
};

function QRRSBlock(totalCount, dataCount) {
    this.totalCount = totalCount;
    this.dataCount = dataCount
}

QRRSBlock.RS_BLOCK_TABLE = [
    [1, 26, 19],
    [1, 26, 16],
    [1, 26, 13],
    [1, 26, 9],
    [1, 44, 34],
    [1, 44, 28],
    [1, 44, 22],
    [1, 44, 16],
    [1, 70, 55],
    [1, 70, 44],
    [2, 35, 17],
    [2, 35, 13],
    [1, 100, 80],
    [2, 50, 32],
    [2, 50, 24],
    [4, 25, 9],
    [1, 134, 108],
    [2, 67, 43],
    [2, 33, 15, 2, 34, 16],
    [2, 33, 11, 2, 34, 12],
    [2, 86, 68],
    [4, 43, 27],
    [4, 43, 19],
    [4, 43, 15],
    [2, 98, 78],
    [4, 49, 31],
    [2, 32, 14, 4, 33, 15],
    [4, 39, 13, 1, 40, 14],
    [2, 121, 97],
    [2, 60, 38, 2, 61, 39],
    [4, 40, 18, 2, 41, 19],
    [4, 40, 14, 2, 41, 15],
    [2, 146, 116],
    [3, 58, 36, 2, 59, 37],
    [4, 36, 16, 4, 37, 17],
    [4, 36, 12, 4, 37, 13],
    [2, 86, 68, 2, 87, 69],
    [4, 69, 43, 1, 70, 44],
    [6, 43, 19, 2, 44, 20],
    [6, 43, 15, 2, 44, 16],
    [4, 101, 81],
    [1, 80, 50, 4, 81, 51],
    [4, 50, 22, 4, 51, 23],
    [3, 36, 12, 8, 37, 13],
    [2, 116, 92, 2, 117, 93],
    [6, 58, 36, 2, 59, 37],
    [4, 46, 20, 6, 47, 21],
    [7, 42, 14, 4, 43, 15],
    [4, 133, 107],
    [8, 59, 37, 1, 60, 38],
    [8, 44, 20, 4, 45, 21],
    [12, 33, 11, 4, 34, 12],
    [3, 145, 115, 1, 146, 116],
    [4, 64, 40, 5, 65, 41],
    [11, 36, 16, 5, 37, 17],
    [11, 36, 12, 5, 37, 13],
    [5, 109, 87, 1, 110, 88],
    [5, 65, 41, 5, 66, 42],
    [5, 54, 24, 7, 55, 25],
    [11, 36, 12],
    [5, 122, 98, 1, 123, 99],
    [7, 73, 45, 3, 74, 46],
    [15, 43, 19, 2, 44, 20],
    [3, 45, 15, 13, 46, 16],
    [1, 135, 107, 5, 136, 108],
    [10, 74, 46, 1, 75, 47],
    [1, 50, 22, 15, 51, 23],
    [2, 42, 14, 17, 43, 15],
    [5, 150, 120, 1, 151, 121],
    [9, 69, 43, 4, 70, 44],
    [17, 50, 22, 1, 51, 23],
    [2, 42, 14, 19, 43, 15],
    [3, 141, 113, 4, 142, 114],
    [3, 70, 44, 11, 71, 45],
    [17, 47, 21, 4, 48, 22],
    [9, 39, 13, 16, 40, 14],
    [3, 135, 107, 5, 136, 108],
    [3, 67, 41, 13, 68, 42],
    [15, 54, 24, 5, 55, 25],
    [15, 43, 15, 10, 44, 16],
    [4, 144, 116, 4, 145, 117],
    [17, 68, 42],
    [17, 50, 22, 6, 51, 23],
    [19, 46, 16, 6, 47, 17],
    [2, 139, 111, 7, 140, 112],
    [17, 74, 46],
    [7, 54, 24, 16, 55, 25],
    [34, 37, 13],
    [4, 151, 121, 5, 152, 122],
    [4, 75, 47, 14, 76, 48],
    [11, 54, 24, 14, 55, 25],
    [16, 45, 15, 14, 46, 16],
    [6, 147, 117, 4, 148, 118],
    [6, 73, 45, 14, 74, 46],
    [11, 54, 24, 16, 55, 25],
    [30, 46, 16, 2, 47, 17],
    [8, 132, 106, 4, 133, 107],
    [8, 75, 47, 13, 76, 48],
    [7, 54, 24, 22, 55, 25],
    [22, 45, 15, 13, 46, 16],
    [10, 142, 114, 2, 143, 115],
    [19, 74, 46, 4, 75, 47],
    [28, 50, 22, 6, 51, 23],
    [33, 46, 16, 4, 47, 17],
    [8, 152, 122, 4, 153, 123],
    [22, 73, 45, 3, 74, 46],
    [8, 53, 23, 26, 54, 24],
    [12, 45, 15, 28, 46, 16],
    [3, 147, 117, 10, 148, 118],
    [3, 73, 45, 23, 74, 46],
    [4, 54, 24, 31, 55, 25],
    [11, 45, 15, 31, 46, 16],
    [7, 146, 116, 7, 147, 117],
    [21, 73, 45, 7, 74, 46],
    [1, 53, 23, 37, 54, 24],
    [19, 45, 15, 26, 46, 16],
    [5, 145, 115, 10, 146, 116],
    [19, 75, 47, 10, 76, 48],
    [15, 54, 24, 25, 55, 25],
    [23, 45, 15, 25, 46, 16],
    [13, 145, 115, 3, 146, 116],
    [2, 74, 46, 29, 75, 47],
    [42, 54, 24, 1, 55, 25],
    [23, 45, 15, 28, 46, 16],
    [17, 145, 115],
    [10, 74, 46, 23, 75, 47],
    [10, 54, 24, 35, 55, 25],
    [19, 45, 15, 35, 46, 16],
    [17, 145, 115, 1, 146, 116],
    [14, 74, 46, 21, 75, 47],
    [29, 54, 24, 19, 55, 25],
    [11, 45, 15, 46, 46, 16],
    [13, 145, 115, 6, 146, 116],
    [14, 74, 46, 23, 75, 47],
    [44, 54, 24, 7, 55, 25],
    [59, 46, 16, 1, 47, 17],
    [12, 151, 121, 7, 152, 122],
    [12, 75, 47, 26, 76, 48],
    [39, 54, 24, 14, 55, 25],
    [22, 45, 15, 41, 46, 16],
    [6, 151, 121, 14, 152, 122],
    [6, 75, 47, 34, 76, 48],
    [46, 54, 24, 10, 55, 25],
    [2, 45, 15, 64, 46, 16],
    [17, 152, 122, 4, 153, 123],
    [29, 74, 46, 14, 75, 47],
    [49, 54, 24, 10, 55, 25],
    [24, 45, 15, 46, 46, 16],
    [4, 152, 122, 18, 153, 123],
    [13, 74, 46, 32, 75, 47],
    [48, 54, 24, 14, 55, 25],
    [42, 45, 15, 32, 46, 16],
    [20, 147, 117, 4, 148, 118],
    [40, 75, 47, 7, 76, 48],
    [43, 54, 24, 22, 55, 25],
    [10, 45, 15, 67, 46, 16],
    [19, 148, 118, 6, 149, 119],
    [18, 75, 47, 31, 76, 48],
    [34, 54, 24, 34, 55, 25],
    [20, 45, 15, 61, 46, 16]
];
QRRSBlock.getRSBlocks = function(typeNumber, errorCorrectLevel) {
    var rsBlock = QRRSBlock.getRsBlockTable(typeNumber, errorCorrectLevel);
    if (rsBlock == undefined) {
        throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + errorCorrectLevel)
    }
    var length = rsBlock.length / 3;
    var list = [];
    for (var i = 0; i < length; i++) {
        var count = rsBlock[i * 3 + 0];
        var totalCount = rsBlock[i * 3 + 1];
        var dataCount = rsBlock[i * 3 + 2];
        for (var j = 0; j < count; j++) {
            list.push(new QRRSBlock(totalCount, dataCount))
        }
    }
    return list
};
QRRSBlock.getRsBlockTable = function(typeNumber, errorCorrectLevel) {
    switch (errorCorrectLevel) {
        case QRErrorCorrectLevel.L:
            return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
        case QRErrorCorrectLevel.M:
            return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
        case QRErrorCorrectLevel.Q:
            return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
        case QRErrorCorrectLevel.H:
            return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
        default:
            return undefined
    }
};

function QRBitBuffer() {
    this.buffer = [];
    this.length = 0
}

QRBitBuffer.prototype = {
    get: function(index) {
        var bufIndex = Math.floor(index / 8);
        return ((this.buffer[bufIndex] >>> (7 - index % 8)) & 1) == 1
    },
    put: function(num, length) {
        for (var i = 0; i < length; i++) {
            this.putBit(((num >>> (length - i - 1)) & 1) == 1)
        }
    },
    getLengthInBits: function() {
        return this.length
    },
    putBit: function(bit) {
        var bufIndex = Math.floor(this.length / 8);
        if (this.buffer.length <= bufIndex) {
            this.buffer.push(0)
        }
        if (bit) {
            this.buffer[bufIndex] |= (0x80 >>> (this.length % 8))
        }
        this.length++
    }
};
var QRCodeLimitLength = [
    [17, 14, 11, 7],
    [32, 26, 20, 14],
    [53, 42, 32, 24],
    [78, 62, 46, 34],
    [106, 84, 60, 44],
    [134, 106, 74, 58],
    [154, 122, 86, 64],
    [192, 152, 108, 84],
    [230, 180, 130, 98],
    [271, 213, 151, 119],
    [321, 251, 177, 137],
    [367, 287, 203, 155],
    [425, 331, 241, 177],
    [458, 362, 258, 194],
    [520, 412, 292, 220],
    [586, 450, 322, 250],
    [644, 504, 364, 280],
    [718, 560, 394, 310],
    [792, 624, 442, 338],
    [858, 666, 482, 382],
    [929, 711, 509, 403],
    [1003, 779, 565, 439],
    [1091, 857, 611, 461],
    [1171, 911, 661, 511],
    [1273, 997, 715, 535],
    [1367, 1059, 751, 593],
    [1465, 1125, 805, 625],
    [1528, 1190, 868, 658],
    [1628, 1264, 908, 698],
    [1732, 1370, 982, 742],
    [1840, 1452, 1030, 790],
    [1952, 1538, 1112, 842],
    [2068, 1628, 1168, 898],
    [2188, 1722, 1228, 958],
    [2303, 1809, 1283, 983],
    [2431, 1911, 1351, 1051],
    [2563, 1989, 1423, 1093],
    [2699, 2099, 1499, 1139],
    [2809, 2213, 1579, 1219],
    [2953, 2331, 1663, 1273]
]

// END OF QR CODE CORE LIBRARY DEFINITION

var Drawing = (function() { // Drawing in Canvas

    var Drawing = function(htOption) {
        this._bIsPainted = false;
        this._htOption = htOption;
        this._elCanvas = new Canvas(htOption.size, htOption.size);
        //this._elCanvas.width = htOption.size;
        //this._elCanvas.height = htOption.size;
        this._oContext = this._elCanvas.getContext('2d');
        //this._oContext = this._elCanvas.getContext("2d");
        this._bIsPainted = false;
        this._bSupportDataURI = null;
        this._callback = htOption.callback;
        this._bindElement = htOption.bindElement;
    };

    Drawing.prototype.draw = function(oQRCode) {
        var _htOption = this._htOption;

        var nCount = oQRCode.getModuleCount();
        var rawSize = _htOption.size;
        var rawMargin = _htOption.margin;

        if (rawMargin < 0 || rawMargin * 2 >= rawSize) {
            rawMargin = 0;
        }

        var margin = Math.ceil(rawMargin);

        var rawViewportSize = rawSize - 2 * rawMargin;

        var whiteMargin = _htOption.whiteMargin;
        var backgroundDimming = _htOption.backgroundDimming;
        var nSize = Math.ceil(rawViewportSize / nCount);
        var viewportSize = nSize * nCount;
        var size = viewportSize + 2 * margin;

        var _tCanvas = new Canvas(size, size);
        var _oContext = _tCanvas.getContext("2d");
        //_tCanvas.width = size;
        //_tCanvas.height = size;

        var dotScale = _htOption.dotScale;
        this.clear();

        if (dotScale <= 0 || dotScale > 1) {
            throw new Error("Scale should be in range (0, 1].")
        }

        // Leave room for margin
        _oContext.save();
        _oContext.translate(margin, margin);

        var _bkgCanvas = new Canvas(size, size);
        //_bkgCanvas.width = size;
        //_bkgCanvas.height = size;
        var _bContext = _bkgCanvas.getContext("2d");

        var _maskCanvas = undefined;
        var _mContext = undefined;

        if (_htOption.backgroundImage !== undefined) {
            //console.log("No bkg");
            if (_htOption.autoColor) {
                //console.log(typeof(_htOption.backgroundImage));
                //console.log(_htOption.backgroundImage);
                var avgRGB = getAverageRGB(_htOption.backgroundImage);
                _htOption.colorDark = "rgb(" + avgRGB.r + ", " + avgRGB.g + ", " + avgRGB.b + ")";
            }

            if (false && _htOption.maskedDots) {
                _maskCanvas = new Canvas(size, size);
                //_maskCanvas.width = size;
                //_maskCanvas.height = size;
                _mContext = _maskCanvas.getContext("2d");
                /*
                 _mContext.drawImage(_htOption.backgroundImage,
                 0, 0, _htOption.backgroundImage.width, _htOption.backgroundImage.height,
                 whiteMargin ? 0 : -margin, whiteMargin ? 0 : -margin, whiteMargin ? viewportSize : size, whiteMargin ? viewportSize : size);
                 */
                _mContext.drawImage(_htOption.backgroundImage,
                    0, 0, _htOption.backgroundImage.width, _htOption.backgroundImage.height,
                    0, 0, size, size);

                _bContext.rect(0, 0, size, size);
                _bContext.fillStyle = "#ffffff";
                _bContext.fill();
            } else {
                /*
                 _bContext.drawImage(_htOption.backgroundImage,
                 0, 0, _htOption.backgroundImage.width, _htOption.backgroundImage.height,
                 whiteMargin ? 0 : -margin, whiteMargin ? 0 : -margin, whiteMargin ? viewportSize : size, whiteMargin ? viewportSize : size);
                 */

                var backgroundImage = new Image();
                backgroundImage.src = _htOption.backgroundImage;
                _bContext.drawImage(backgroundImage,
                    0, 0, backgroundImage.width,backgroundImage.height,
                    0, 0, size, size);
                _bContext.rect(0, 0, size, size);
                _bContext.fillStyle = backgroundDimming;
                _bContext.fill();
            }
        } else {
            //console.log("has bkg");
            _bContext.rect(0, 0, size, size);
            _bContext.fillStyle = "#ffffff";
            _bContext.fill();
        }

        if (false && _htOption.binarize) {
            _htOption.colorDark = "#000000";
            _htOption.colorLight = "#FFFFFF";
        }

        var agnPatternCenter = QRUtil.getPatternPosition(oQRCode.typeNumber);

        var xyOffset = (1 - dotScale) * 0.5;
        for (var row = 0; row < nCount; row++) {
            for (var col = 0; col < nCount; col++) {
                var bIsDark = oQRCode.isDark(row, col);

                // var isBlkPosCtr = ((col < 8 && (row < 8 || row >= nCount - 8)) || (col >= nCount - 8 && row < 8) || (col < nCount - 4 && col >= nCount - 4 - 5 && row < nCount - 4 && row >= nCount - 4 - 5));
                var isBlkPosCtr = ((col < 8 && (row < 8 || row >= nCount - 8)) || (col >= nCount - 8 && row < 8));
                var isBlkPos = ((col < 7 && (row < 7 || row >= nCount - 7)) || (col >= nCount - 7 && row < 7));
                var bProtected = (row === 6 || col === 6 || isBlkPosCtr);

                for (var i = 0; i < agnPatternCenter.length - 1; i++) {
                    bProtected = bProtected || (row >= agnPatternCenter[i] - 2 && row <= agnPatternCenter[i] + 2 && col >= agnPatternCenter[i] - 2 && col <= agnPatternCenter[i] + 2);
                }

                var nLeft = col * nSize + (bProtected ? 0 : (xyOffset * nSize));
                var nTop = row * nSize + (bProtected ? 0 : (xyOffset * nSize));
                _oContext.strokeStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight;
                _oContext.lineWidth = 0.5;
                _oContext.fillStyle = bIsDark ? _htOption.colorDark : "rgba(255, 255, 255, 0.6)"; //_htOption.colorLight;
                if (agnPatternCenter.length === 0) {
                    // if align pattern list is empty, then it means that we don't need to leave room for the align patterns
                    if (!bProtected)
                        _fillRectWithMask(_oContext, nLeft, nTop, (bProtected ? (isBlkPosCtr ? 1 : 1) : dotScale) * nSize, (bProtected ? (isBlkPosCtr ? 1 : 1) : dotScale) * nSize, _maskCanvas, bIsDark);
                } else {
                    var inAgnRange = ((col < nCount - 4 && col >= nCount - 4 - 5 && row < nCount - 4 && row >= nCount - 4 - 5));
                    if (!bProtected && !inAgnRange)
                        _fillRectWithMask(_oContext, nLeft, nTop, (bProtected ? (isBlkPosCtr ? 1 : 1) : dotScale) * nSize, (bProtected ? (isBlkPosCtr ? 1 : 1) : dotScale) * nSize, _maskCanvas, bIsDark);
                }
            }
        }

        //console.log("POSITION protectors");
        // Draw POSITION protectors
        var protectorStyle = "rgba(255, 255, 255, 0.6)";
        _oContext.fillStyle = protectorStyle;
        _oContext.fillRect(0, 0, 8 * nSize, 8 * nSize);
        _oContext.fillRect(0, (nCount - 8) * nSize, 8 * nSize, 8 * nSize);
        _oContext.fillRect((nCount - 8) * nSize, 0, 8 * nSize, 8 * nSize);
        _oContext.fillRect(8 * nSize, 6 * nSize, (nCount - 8 - 8) * nSize, nSize);
        _oContext.fillRect(6 * nSize, 8 * nSize, nSize, (nCount - 8 - 8) * nSize);

        //console.log("ALIGN protectors");
        // Draw ALIGN protectors
        var edgeCenter = agnPatternCenter[agnPatternCenter.length - 1];
        for (var i = 0; i < agnPatternCenter.length; i++) {
            for (var j = 0; j < agnPatternCenter.length; j++) {
                var agnX = agnPatternCenter[j];
                var agnY = agnPatternCenter[i];
                if (agnX === 6 && (agnY === 6 || agnY === edgeCenter)) {
                    continue;
                } else if (agnY === 6 && (agnX === 6 || agnX === edgeCenter)) {
                    continue;
                } else if (agnX !== 6 && agnX !== edgeCenter && agnY !== 6 && agnY !== edgeCenter) {
                    _drawAlignProtector(_oContext, agnX, agnY, nSize, nSize);
                } else {
                    _drawAlignProtector(_oContext, agnX, agnY, nSize, nSize);
                }
                // console.log("agnX=" + agnX + ", agnY=" + agnX);
            }
        }

        // Draw POSITION patterns
        _oContext.fillStyle = _htOption.colorDark;
        _oContext.fillRect(0, 0, 7 * nSize, nSize);
        _oContext.fillRect((nCount - 7) * nSize, 0, 7 * nSize, nSize);
        _oContext.fillRect(0, 6 * nSize, 7 * nSize, nSize);
        _oContext.fillRect((nCount - 7) * nSize, 6 * nSize, 7 * nSize, nSize);
        _oContext.fillRect(0, (nCount - 7) * nSize, 7 * nSize, nSize);
        _oContext.fillRect(0, (nCount - 7 + 6) * nSize, 7 * nSize, nSize);
        _oContext.fillRect(0, 0, nSize, 7 * nSize);
        _oContext.fillRect(6 * nSize, 0, nSize, 7 * nSize);
        _oContext.fillRect((nCount - 7) * nSize, 0, nSize, 7 * nSize);
        _oContext.fillRect((nCount - 7 + 6) * nSize, 0, nSize, 7 * nSize);
        _oContext.fillRect(0, (nCount - 7) * nSize, nSize, 7 * nSize);
        _oContext.fillRect(6 * nSize, (nCount - 7) * nSize, nSize, 7 * nSize);

        _oContext.fillRect(2 * nSize, 2 * nSize, 3 * nSize, 3 * nSize);
        _oContext.fillRect((nCount - 7 + 2) * nSize, 2 * nSize, 3 * nSize, 3 * nSize);
        _oContext.fillRect(2 * nSize, (nCount - 7 + 2) * nSize, 3 * nSize, 3 * nSize);

        for (var i = 0; i < nCount - 8; i += 2) {
            _oContext.fillRect((8 + i) * nSize, 6 * nSize, nSize, nSize);
            _oContext.fillRect(6 * nSize, (8 + i) * nSize, nSize, nSize);
        }
        for (var i = 0; i < agnPatternCenter.length; i++) {
            for (var j = 0; j < agnPatternCenter.length; j++) {
                var agnX = agnPatternCenter[j];
                var agnY = agnPatternCenter[i];
                if (agnX === 6 && (agnY === 6 || agnY === edgeCenter)) {
                    continue;
                } else if (agnY === 6 && (agnX === 6 || agnX === edgeCenter)) {
                    continue;
                } else if (agnX !== 6 && agnX !== edgeCenter && agnY !== 6 && agnY !== edgeCenter) {
                    _oContext.fillStyle = "rgba(0, 0, 0, .2)";
                    _drawAlign(_oContext, agnX, agnY, nSize, nSize);
                } else {
                    _oContext.fillStyle = _htOption.colorDark;
                    _drawAlign(_oContext, agnX, agnY, nSize, nSize);
                }
            }
        }

        // Fill the margin
        if (whiteMargin) {
            _oContext.fillStyle = '#FFFFFF';
            _oContext.fillRect(-margin, -margin, size, margin);
            _oContext.fillRect(-margin, viewportSize, size, margin);
            _oContext.fillRect(viewportSize, -margin, margin, size);
            _oContext.fillRect(-margin, -margin, margin, size);
        }

        if (_htOption.logoImage !== undefined) {
            var logoScale = _htOption.logoScale;
            var logoMargin = _htOption.logoMargin;
            var logoCornerRadius = _htOption.logoCornerRadius;
            var logoImage = new Image();
            logoImage.src = _htOption.logoImage;
            if (logoScale <= 0 || logoScale >= 1.0) {
                logoScale = 0.2;
            }
            if (logoMargin < 0) {
                logoMargin = 0;
            }
            if (logoCornerRadius < 0) {
                logoCornerRadius = 0;
            }

            _oContext.restore();

            var logoSize = viewportSize * logoScale;
            var x = 0.5 * (size - logoSize);
            var y = x;

            _oContext.fillStyle = '#FFFFFF';
            _oContext.save();
            _prepareRoundedCornerClip(_oContext, x - logoMargin, y - logoMargin, logoSize + 2 * logoMargin, logoSize + 2 * logoMargin, logoCornerRadius);
            _oContext.clip();
            _oContext.fill();
            _oContext.restore();

            _oContext.save();
            _prepareRoundedCornerClip(_oContext, x, y, logoSize, logoSize, logoCornerRadius);
            _oContext.clip();
            _oContext.drawImage(logoImage, x, y, logoSize, logoSize);
            _oContext.restore();
        }
        // Swap and merge the foreground and the background
        _bContext.drawImage(_tCanvas, 0, 0, size, size);
        _oContext.drawImage(_bkgCanvas, -margin, -margin, size, size);

        // Binarize the final image
        if (false && _htOption.binarize) {
            var pixels = _oContext.getImageData(0, 0, size, size);
            var threshold = 128;
            if (parseInt(_htOption.binarizeThreshold) > 0 && parseInt(_htOption.binarizeThreshold) < 255) {
                threshold = parseInt(_htOption.binarizeThreshold);
            }
            for (var i = 0; i < pixels.data.length; i += 4) {
                // rgb in [0, 255]
                var R = pixels.data[i];
                var G = pixels.data[i + 1];
                var B = pixels.data[i + 2];
                var sum = _greyscale(R, G, B);
                if (sum > threshold) {
                    pixels.data[i] = 255;
                    pixels.data[i + 1] = 255;
                    pixels.data[i + 2] = 255;
                } else {
                    pixels.data[i] = 0;
                    pixels.data[i + 1] = 0;
                    pixels.data[i + 2] = 0;
                }
            }
            _oContext.putImageData(pixels, 0, 0);
        }

        // Scale the final image
        var _fCanvas = new Canvas(rawSize, rawSize); //document.createElement("canvas");
        var _fContext = _fCanvas.getContext("2d");
        //_fCanvas.width = rawSize;
        //_fCanvas.height = rawSize;
        _fContext.drawImage(_tCanvas, 0, 0, rawSize, rawSize);
        this._elCanvas = _fCanvas;

        // Painting work completed
        this._bIsPainted = true;

        if (this._callback !== undefined && typeof(this._callback) === "function") {
            this._callback(this._elCanvas.toBuffer());
        }
    };

    Drawing.prototype.isPainted = function() {
        return this._bIsPainted;
    };

    Drawing.prototype.clear = function() {
        this._oContext.clearRect(0, 0, this._elCanvas.width, this._elCanvas.height);
        this._bIsPainted = false;
    };

    Drawing.prototype.round = function(nNumber) {
        if (!nNumber) {
            return nNumber;
        }

        return Math.floor(nNumber * 1000) / 1000;
    };

    return Drawing;
})();

// Utilities and useful helpers

function _getUTF8Length(sText) {
    var replacedText = encodeURI(sText).toString().replace(/\%[0-9a-fA-F]{2}/g, 'a');
    return replacedText.length + (replacedText.length != sText ? 3 : 0);
}

function _prepareRoundedCornerClip(ctx, x, y, w, h, r) {
    ctx.beginPath();
    ctx.moveTo(x, y);
    ctx.arcTo(x + w, y, x + w, y + h, r);
    ctx.arcTo(x + w, y + h, x, y + h, r);
    ctx.arcTo(x, y + h, x, y, r);
    ctx.arcTo(x, y, x + w, y, r);
    ctx.closePath();
}

function _setPixel(imageData, p, r, g, b, a) {
    index = p * 4;
    imageData.data[index + 0] = r;
    imageData.data[index + 1] = g;
    imageData.data[index + 2] = b;
    imageData.data[index + 3] = a;
}

function _greyscale(r, g, b) {
    return 0.30 * r + 0.59 * b + 0.11 * b;
}

function _fillRectWithMask(canvas, x, y, w, h, maskSrc, bDark) {
    //console.log("maskSrc=" + maskSrc);
    if (maskSrc === undefined) {
        canvas.fillRect(x, y, w, h);
    } else {
        canvas.drawImage(maskSrc, x, y, w, h, x, y, w, h);
        var fill_ = canvas.fillStyle;
        canvas.fillStyle = bDark ? "rgba(0, 0, 0, .5)" : "rgba(255, 255, 255, .7)";
        canvas.fillRect(x, y, w, h);
        canvas.fillStyle = fill_;
    }
}

function _drawAlignProtector(context, centerX, centerY, nWidth, nHeight) {
    context.clearRect((centerX - 2) * nWidth, (centerY - 2) * nHeight, 5 * nWidth, 5 * nHeight);
    context.fillRect((centerX - 2) * nWidth, (centerY - 2) * nHeight, 5 * nWidth, 5 * nHeight);
}

function _drawAlign(context, centerX, centerY, nWidth, nHeight) {
    context.fillRect((centerX - 2) * nWidth, (centerY - 2) * nHeight, nWidth, 4 * nHeight);
    context.fillRect((centerX + 2) * nWidth, (centerY - 2 + 1) * nHeight, nWidth, 4 * nHeight);
    context.fillRect((centerX - 2 + 1) * nWidth, (centerY - 2) * nHeight, 4 * nWidth, nHeight);
    context.fillRect((centerX - 2) * nWidth, (centerY + 2) * nHeight, 4 * nWidth, nHeight);
    context.fillRect(centerX * nWidth, centerY * nHeight, nWidth, nHeight);
}

AwesomeQRCode = function() {};

AwesomeQRCode.prototype.create = function(vOption) {

    console.log(vOption);
    try {
        this._htOption = {
            size: 800,
            margin: 20,
            typeNumber: 4,
            colorDark: "#000000",
            colorLight: "#ffffff",
            correctLevel: QRErrorCorrectLevel.M,
            backgroundImage: undefined,
            backgroundDimming: 'rgba(0,0,0,0)',
            logoImage: undefined,
            logoScale: 0.2,
            logoMargin: 6,
            logoCornerRadius: 8,
            whiteMargin: true,
            dotScale: 0.35,
            autoColor: true,
            callback: undefined
        };

        console.log("validating");
        if (typeof vOption === 'string') {
            vOption = {
                text: vOption
            };
        }

        if (vOption) {
            for (var i in vOption) {
                this._htOption[i] = vOption[i];
            }

            this._oQRCode = null;
            this._oDrawing = new Drawing(this._htOption);

            if (this._htOption.text) {
                this.makeCode(this._htOption.text);
            } else {
                console.log("no text");
                if (this._callback !== undefined && typeof(this._callback) === "function") {
                    this._callback(undefined);
                }
            }
        }
    } catch (e) {
        console.error(e);
        if (this._callback !== undefined && typeof(this._callback) === "function") {
            this._callback(undefined);
        }
    }
};

function _getTypeNumber(sText, nCorrectLevel) {
    var nType = 1;
    var length = _getUTF8Length(sText);

    for (var i = 0, len = QRCodeLimitLength.length; i <= len; i++) {
        var nLimit = 0;

        switch (nCorrectLevel) {
            case QRErrorCorrectLevel.L:
                nLimit = QRCodeLimitLength[i][0];
                break;
            case QRErrorCorrectLevel.M:
                nLimit = QRCodeLimitLength[i][1];
                break;
            case QRErrorCorrectLevel.Q:
                nLimit = QRCodeLimitLength[i][2];
                break;
            case QRErrorCorrectLevel.H:
                nLimit = QRCodeLimitLength[i][3];
                break;
        }

        if (length <= nLimit) {
            break;
        } else {
            nType++;
        }
    }

    if (nType > QRCodeLimitLength.length) {
        throw new Error("Too long data");
    }

    return nType;
}

AwesomeQRCode.prototype.makeCode = function(sText) {
    //this._oQRCode = new QRCodeModel(_getTypeNumber(sText, this._htOption.correctLevel), this._htOption.correctLevel);
    this._oQRCode = new QRCodeModel(-1, this._htOption.correctLevel);
    this._oQRCode.addData(sText);
    this._oQRCode.make();
    return this._oDrawing.draw(this._oQRCode);
};

AwesomeQRCode.prototype.clear = function() {
    this._oDrawing.clear();
};

AwesomeQRCode.CorrectLevel = QRErrorCorrectLevel;

function getAverageRGB(imgSrc) {
    var imgEl = new Image();
    imgEl.src = imgSrc;
    var blockSize = 5,
        defaultRGB = {
            r: 0,
            g: 0,
            b: 0
        },
        canvas = new Canvas(),
        context = canvas.getContext('2d'),
        data, width, height,
        i = -4,
        length,
        rgb = {
            r: 0,
            g: 0,
            b: 0
        },
        count = 0;

    if (!context) {
        return defaultRGB;
    }

    height = canvas.height = imgEl.naturalHeight || imgEl.offsetHeight || imgEl.height;
    width = canvas.width = imgEl.naturalWidth || imgEl.offsetWidth || imgEl.width;

    context.drawImage(imgEl, 0, 0);

    try {
        data = context.getImageData(0, 0, width, height);
    } catch (e) {
        return defaultRGB;
    }

    length = data.data.length;

    while ((i += blockSize * 4) < length) {
        if (data.data[i] > 200 || data.data[i + 1] > 200 || data.data[i + 2] > 200) continue;
        ++count;
        rgb.r += data.data[i];
        rgb.g += data.data[i + 1];
        rgb.b += data.data[i + 2];
    }

    rgb.r = ~~(rgb.r / count);
    rgb.g = ~~(rgb.g / count);
    rgb.b = ~~(rgb.b / count);

    return rgb;
}

module.exports = AwesomeQRCode;