QRCode.js

/**
 * EasyQRCode-React-Native
 *
 * React Native QRCode generation component. Can generate standard QRCode image or base64 image data url text. Cross-browser QRCode generator for pure javascript. Support Dot style, Logo, Background image, Colorful, Title etc. settings. support binary mode.
 *
 * Version 4.0.11
 *
 * @author [ inthinkcolor@gmail.com ]
 *
 * @see https://github.com/ushelp/EasyQRCode-React-Native
 * @see http://www.easyproject.cn/easyqrcodejs/tryit.html
 *
 * Copyright 2017 Ray, EasyProject
 * Released under the MIT license
 *
 * [React Native]
 *
 */
import Canvas, {
	Image as CanvasImage
} from 'react-native-canvas';

function QR8bitByte(data, binary, utf8WithoutBOM) {
	this.mode = QRMode.MODE_8BIT_BYTE;
	this.data = data;
	this.parsedData = [];

	function toUTF8Array(str) {
		var utf8 = [];
		for (var i = 0; i < str.length; i++) {
			var charcode = str.charCodeAt(i);
			if (charcode < 0x80) utf8.push(charcode);
			else if (charcode < 0x800) {
				utf8.push(0xc0 | (charcode >> 6),
					0x80 | (charcode & 0x3f));
			} else if (charcode < 0xd800 || charcode >= 0xe000) {
				utf8.push(0xe0 | (charcode >> 12),
					0x80 | ((charcode >> 6) & 0x3f),
					0x80 | (charcode & 0x3f));
			} else {
				i++;
				charcode = 0x10000 + (((charcode & 0x3ff) << 10) |
					(str.charCodeAt(i) & 0x3ff));
				utf8.push(0xf0 | (charcode >> 18),
					0x80 | ((charcode >> 12) & 0x3f),
					0x80 | ((charcode >> 6) & 0x3f),
					0x80 | (charcode & 0x3f));
			}
		}
		return utf8;
	}

	if (binary) {
		for (var i = 0, l = this.data.length; i < l; i++) {
			var byteArray = [];
			var code = this.data.charCodeAt(i);
			byteArray[0] = code;

			this.parsedData.push(byteArray);
		}
		this.parsedData = Array.prototype.concat.apply([], this.parsedData);

	} else {
		this.parsedData = toUTF8Array(data);
	}

	this.parsedData = Array.prototype.concat.apply([], this.parsedData);
	if (!utf8WithoutBOM && 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, binary, utf8WithoutBOM) {
		var newData = new QR8bitByte(data, binary, utf8WithoutBOM);
		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][0];
	},
	getEye: function(row, col) {
		if (row < 0 || this.moduleCount <= row || col < 0 || this.moduleCount <= col) {
			throw new Error(row + "," + col);
		}

		var block = this.modules[row][col]; // [isDark(ture/false), EyeOuterOrInner(O/I), Position(TL/TR/BL/A) ]

		if (block[1]) {
			var type = 'P' + block[1] + '_' + block[2]; //PO_TL, PI_TL, PO_TR, PI_TR, PO_BL, PI_BL
			if (block[2] == 'A') {
				type = 'A' + block[1]; // AI, AO
			}

			return {
				isDarkBlock: block[0],
				type: type
			};
		} else {
			return null;
		}
	},
	getModuleCount: function() {
		return this.moduleCount;
	},
	make: function() {
		this.makeImpl(false, 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] = []; // [isDark(ture/false), EyeOuterOrInner(O/I), Position(TL/TR/BL) ]
			}
		}
		this.setupPositionProbePattern(0, 0, 'TL'); // TopLeft, TL
		this.setupPositionProbePattern(this.moduleCount - 7, 0, 'BL'); // BotoomLeft, BL
		this.setupPositionProbePattern(0, this.moduleCount - 7, 'TR'); // TopRight, TR
		this.setupPositionAdjustPattern('A'); // Alignment, A
		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, posName) {
		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] = true;

					this.modules[row + r][col + c][2] = posName; // Position
					if (r == -0 || c == -0 || r == 6 || c == 6) {
						this.modules[row + r][col + c][1] = 'O'; // Position Outer
					} else {
						this.modules[row + r][col + c][1] = 'I'; // Position Inner
					}
				} else {
					this.modules[row + r][col + c][0] = false;
				}
			}
		}
	},
	getBestMaskPattern: function() {
		var minLostPoint = 0;
		var pattern = 0;
		for (var i = 0; i < 8; i++) {
			this.makeImpl(true, 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][0];
				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][0] != null) {
				continue;
			}
			this.modules[r][6][0] = (r % 2 == 0);
		}
		for (var c = 8; c < this.moduleCount - 8; c++) {
			if (this.modules[6][c][0] != null) {
				continue;
			}
			this.modules[6][c][0] = (c % 2 == 0);
		}
	},
	setupPositionAdjustPattern: function(posName) {
		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][0] != 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] = true;
							this.modules[row + r][col + c][2] = posName; // Position
							if (r == -2 || c == -2 || r == 2 || c == 2) {
								this.modules[row + r][col + c][1] = 'O'; // Position Outer
							} else {
								this.modules[row + r][col + c][1] = 'I'; // Position Inner
							}
						} else {
							this.modules[row + r][col + c][0] = false;
						}
					}
				}
			}
		}
	},
	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][0] = 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)][0] = 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][0] = mod;
			} else if (i < 8) {
				this.modules[i + 1][8][0] = mod;
			} else {
				this.modules[this.moduleCount - 15 + i][8][0] = 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][0] = mod;
			} else if (i < 9) {
				this.modules[8][15 - i - 1 + 1][0] = mod;
			} else {
				this.modules[8][15 - i - 1][0] = mod;
			}
		}
		this.modules[this.moduleCount - 8][8][0] = (!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 (true) {
				for (var c = 0; c < 2; c++) {
					if (this.modules[row][col - c][0] == null) {
						var dark = false;
						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][0] = 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(false);
	}
	while (true) {
		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, 7, 37, 13],
	[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]
];

/**
 * Get the type by string length
 *
 * @private
 * @param {String} sText
 * @param {Number} nCorrectLevel
 * @return {Number} type
 */
function _getTypeNumber(sText, _htOption) {

	var nCorrectLevel = _htOption.correctLevel;


	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. the CorrectLevel." + ['M', 'L', 'H', 'Q'][nCorrectLevel] +
			" limit length is " + nLimit);
	}

	if (_htOption.version != 0) {
		if (nType <= _htOption.version) {
			nType = _htOption.version;
			_htOption.runVersion = nType;
		} else {
			console.warn("QR Code version " + _htOption.version + " too small, run version use " + nType);
			_htOption.runVersion = nType;
		}
	}


	return nType;
}

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

/**
 * Drawing QRCode by using canvas
 *
 * @constructor
 * @param {HTMLElement} el
 * @param {Object} htOption QRCode Options
 */
var Drawing = function(canvas, htOption) {
	this._bIsPainted = false;
	this._htOption = htOption;
	this._canvas = canvas;
	this._bSupportDataURI = null;
};

/**
 * Draw the QRCode
 *
 * @param {QRCode} oQRCode
 */
Drawing.prototype.draw = function(oQRCode) {
	var _htOption = this._htOption;
	if (_htOption.onRenderingStart) {
		_htOption.onRenderingStart(_htOption)
	}

	var nCount = oQRCode.getModuleCount();
	var nWidth = Math.round(_htOption.width / nCount);
	var nHeight = Math.round((_htOption.height - _htOption.titleHeight) / nCount);
	if (nWidth <= 1) {
		nWidth = 1;
	}
	if (nHeight <= 1) {
		nHeight = 1;
	}

	_htOption.quietZone = Math.round(_htOption.quietZone);

	_htOption.width = nWidth * nCount;
	_htOption.height = nHeight * nCount + _htOption.titleHeight;
	this._canvas.height = _htOption.height + _htOption.quietZone * 2;
	this._canvas.width = _htOption.width + _htOption.quietZone * 2;

	var autoColorDark = _htOption.autoColorDark;
	var autoColorLight = _htOption.autoColorLight;
	var notAutoColorLight = "rgba(0,0,0,0)";

	this._oContext = this._canvas.getContext("2d");
	this._oContext.patternQuality = 'best'; //'fast'|'good'|'best'|'nearest'|'bilinear'
	this._oContext.quality = 'best'; //'fast'|'good'|'best'|'nearest'|'bilinear'
	this._oContext.textDrawingMode = 'path'; // 'path'|'glyph'
	this._oContext.antialias = 'gray'; // 'default'|'none'|'gray'|'subpixel'

	var _oContext = this._oContext;
	_oContext.lineWidth = 0;
	_oContext.fillStyle = _htOption.colorLight;
	_oContext.fillRect(0, 0, this._canvas.width, this._canvas.height);
	_oContext.clearRect(_htOption.quietZone, _htOption.quietZone, _htOption.width, _htOption.titleHeight);

	var t = this;

	function drawQuietZoneColor() {
		if (_htOption.quietZone > 0 && _htOption.quietZoneColor) {
			// top
			_oContext.lineWidth = 0;
			_oContext.fillStyle = _htOption.quietZoneColor;

			_oContext.fillRect(0, 0, t._canvas.width, _htOption.quietZone);
			// left
			_oContext.fillRect(0, _htOption.quietZone, _htOption.quietZone, t._canvas.height - _htOption.quietZone *
				2);
			// right
			_oContext.fillRect(t._canvas.width - _htOption.quietZone, _htOption.quietZone, _htOption.quietZone, t
				._canvas
				.height - _htOption.quietZone * 2);
			// bottom
			_oContext.fillRect(0, t._canvas.height - _htOption.quietZone, t._canvas.width, _htOption.quietZone);
		}
	}

	if (_htOption.backgroundImage) {

		// backgroundImage
		var bgImg = new CanvasImage(t._canvas);

		bgImg.addEventListener('load', () => {
			_oContext.globalAlpha = 1;
			_oContext.globalAlpha = _htOption.backgroundImageAlpha;
			_oContext.drawImage(bgImg, 0, _htOption.titleHeight, _htOption.width + _htOption.quietZone * 2,
				_htOption.height +
				_htOption.quietZone * 2 - _htOption.titleHeight);
			_oContext.globalAlpha = 1;

			drawQrcode.call(t, oQRCode);
		});
		bgImg.addEventListener('error', () => {
			console.error("Background image can not load!");
		});
		bgImg.src = _htOption.backgroundImage;

		// if(!(_htOption.backgroundImage.startsWith("http://") || _htOption.backgroundImage.startsWith("https://") || _htOption.backgroundImage.startsWith("ftp://"))){
		//     imageSrc = Image.resolveAssetSource(require(_htOption.backgroundImage)).uri;
		// }    

		// DoSomething
	} else {
		drawQrcode.call(t, oQRCode);
	}

	function drawQrcode(oQRCode) {

		for (var row = 0; row < nCount; row++) {
			for (var col = 0; col < nCount; col++) {
				var nLeft = col * nWidth + _htOption.quietZone;
				var nTop = row * nHeight + _htOption.quietZone;

				var bIsDark = oQRCode.isDark(row, col);

				var eye = oQRCode.getEye(row,
					col); // { isDark: true/false, type: PO_TL, PI_TL, PO_TR, PI_TR, PO_BL, PI_BL };

				var nowDotScale = _htOption.dotScale;

				_oContext.lineWidth = 0;

				// Color handler
				var dColor;
				var lColor;
				if (eye) {
					dColor = _htOption[eye.type] || _htOption[eye.type.substring(
							0, 2)] ||
						_htOption.colorDark;
					lColor = _htOption.colorLight;
				} else {
					if (_htOption.backgroundImage) {

						lColor = "rgba(0,0,0,0)";
						if (row == 6) {
							// dColor = _htOption.timing_H || _htOption.timing || _htOption.colorDark;
							if (_htOption.autoColor) {
								dColor = _htOption.timing_H || _htOption.timing || _htOption.autoColorDark;
								lColor = _htOption.autoColorLight;
							} else {
								dColor = _htOption.timing_H || _htOption.timing || _htOption.colorDark;
							}
						} else if (col == 6) {
							// dColor = _htOption.timing_V || _htOption.timing || _htOption.colorDark;
							if (_htOption.autoColor) {
								dColor = _htOption.timing_V || _htOption.timing || _htOption.autoColorDark;
								lColor = _htOption.autoColorLight;
							} else {
								dColor = _htOption.timing_V || _htOption.timing ||
									_htOption.colorDark;
							}
						} else {
							if (_htOption.autoColor) {
								dColor = _htOption.autoColorDark;
								lColor = _htOption.autoColorLight;
							} else {
								dColor = _htOption.colorDark;
							}
						}

					} else {
						if (row == 6) {
							dColor = _htOption.timing_H || _htOption.timing || _htOption.colorDark;
						} else if (col == 6) {
							dColor = _htOption.timing_V || _htOption.timing ||
								_htOption.colorDark;
						} else {
							dColor = _htOption.colorDark;
						}
						lColor = _htOption.colorLight;
					}
				}
				_oContext.strokeStyle = bIsDark ? dColor :
					lColor;
				_oContext.fillStyle = bIsDark ? dColor :
					lColor;

				if (eye) {
					// Is eye
					bIsDark = eye.isDarkBlock;
					var type = eye.type;
					if (eye.type == 'AO') {
						nowDotScale = _htOption.dotScaleAO;
					} else if (eye.type == 'AI') {
						nowDotScale = _htOption.dotScaleAI;
					} else {
						nowDotScale = 1;
					}

					if (_htOption.backgroundImage && _htOption.autoColor) {
						dColor = ((eye.type == 'AO') ? _htOption.AI : _htOption.AO) ||
							_htOption.autoColorDark;
						lColor = _htOption.autoColorLight;
					} else {
						dColor = ((eye.type == 'AO') ? _htOption.AI : _htOption.AO) ||
							dColor;
					}

					// _oContext.fillRect(nLeft, _htOption.titleHeight + nTop, nWidth, nHeight);
					_oContext.fillRect(nLeft + nWidth * (1 - nowDotScale) / 2, _htOption.titleHeight +
						nTop + nHeight * (1 -
							nowDotScale) / 2, nWidth * nowDotScale, nHeight *
						nowDotScale);
				} else {
					if (row == 6) {
						// Timing Pattern
						nowDotScale = _htOption.dotScaleTiming_H;

						_oContext.fillRect(nLeft + nWidth * (1 - nowDotScale) / 2, _htOption.titleHeight + nTop +
							nHeight * (1 -
								nowDotScale) / 2, nWidth * nowDotScale, nHeight * nowDotScale);
					} else if (col == 6) {
						// Timing Pattern
						nowDotScale = _htOption.dotScaleTiming_V;
						_oContext.fillRect(nLeft + nWidth * (1 - nowDotScale) / 2, _htOption.titleHeight + nTop +
							nHeight * (1 -
								nowDotScale) / 2, nWidth * nowDotScale, nHeight * nowDotScale);
					} else {

						if (_htOption.backgroundImage) {

							_oContext.fillRect(nLeft + nWidth * (1 - nowDotScale) / 2, _htOption.titleHeight +
								nTop +
								nHeight * (1 -
									nowDotScale) / 2, nWidth * nowDotScale, nHeight * nowDotScale);

						} else {

							_oContext.fillRect(nLeft + nWidth * (1 - nowDotScale) / 2, _htOption.titleHeight +
								nTop +
								nHeight * (1 -
									nowDotScale) / 2, nWidth * nowDotScale, nHeight * nowDotScale);

						}
					}
				}

				if (_htOption.dotScale != 1 && !eye) {
					_oContext.strokeStyle = _htOption.colorLight;
				}

			}
		}

		if (_htOption.title) {
			_oContext.fillStyle = _htOption.titleBackgroundColor;
			// _oContext.fillRect(0, 0, t._canvas.width, _htOption.titleHeight + this._htOption.quietZone);
			_oContext.fillRect(_htOption.quietZone, _htOption.quietZone, _htOption.width, _htOption.titleHeight);

			_oContext.font = _htOption.titleFont;
			_oContext.fillStyle = _htOption.titleColor;
			_oContext.textAlign = 'center';
			_oContext.fillText(_htOption.title, t._canvas.width / 2, this._htOption.quietZone + this._htOption
				.titleTop);
		}

		if (_htOption.subTitle) {
			_oContext.font = _htOption.subTitleFont;
			_oContext.fillStyle = _htOption.subTitleColor;
			_oContext.fillText(_htOption.subTitle, t._canvas.width / 2, this._htOption.quietZone + this._htOption
				.subTitleTop);
		}

		if (_htOption.logo) {
			var logoImg = new CanvasImage(t._canvas);

			function generateLogoImg(img) {
				var imgContainerW = Math.round(_htOption.width / 3.5);
				var imgContainerH = Math.round(_htOption.height / 3.5);
				if (imgContainerW !== imgContainerH) {
					imgContainerW = imgContainerH;
				}

				if (_htOption.logoMaxWidth) {
					imgContainerW = Math.round(_htOption.logoMaxWidth);
				} else if (_htOption.logoWidth) {
					imgContainerW = Math.round(_htOption.logoWidth);
				}

				if (_htOption.logoMaxHeight) {
					imgContainerH = Math.round(_htOption.logoMaxHeight);
				} else if (_htOption.logoHeight) {
					imgContainerH = Math.round(_htOption.logoHeight);
				}

				var nw;
				var nh;
				if (typeof img.naturalWidth == "undefined") {
					// IE 6/7/8
					nw = img.width;
					nh = img.height;
				} else {
					// HTML5 browsers
					nw = img.naturalWidth;
					nh = img.naturalHeight;
				}

				if (_htOption.logoMaxWidth || _htOption.logoMaxHeight) {
					if (_htOption.logoMaxWidth && nw <= imgContainerW) {
						imgContainerW = nw;
					}

					if (_htOption.logoMaxHeight && nh <= imgContainerH) {
						imgContainerH = nh;
					}
					if (nw <= imgContainerW && nh <= imgContainerH) {
						imgContainerW = nw;
						imgContainerH = nh;
					}
				}

				var imgContainerX = (_htOption.width + _htOption.quietZone * 2 - imgContainerW) / 2;
				var imgContainerY = (_htOption.height + _htOption.titleHeight + _htOption.quietZone *
					2 - imgContainerH) / 2;

				var imgScale = Math.min(imgContainerW / nw, imgContainerH / nh);
				var imgW = nw * imgScale;
				var imgH = nh * imgScale;

				if (_htOption.logoMaxWidth || _htOption.logoMaxHeight) {
					imgContainerW = imgW;
					imgContainerH = imgH;
					imgContainerX = (_htOption.width + _htOption.quietZone * 2 - imgContainerW) / 2;
					imgContainerY = (_htOption.height + _htOption.titleHeight + _htOption
						.quietZone *
						2 - imgContainerH) / 2;

				}

				// Did Not Use Transparent Logo Image
				if (!_htOption.logoBackgroundTransparent) {
					//if (!_htOption.logoBackgroundColor) {
					//_htOption.logoBackgroundColor = '#ffffff';
					//}
					_oContext.fillStyle = _htOption.logoBackgroundColor;

					_oContext.fillRect(imgContainerX, imgContainerY, imgContainerW, imgContainerH);
				}
				_oContext.drawImage(img, imgContainerX + (imgContainerW - imgW) / 2, imgContainerY +
					(imgContainerH - imgH) / 2, imgW, imgH);

				t._bIsPainted = true;

				drawQuietZoneColor();
				if (_htOption.onRenderingEnd) {
					_htOption.onRenderingEnd(_htOption, function() {
						return t._canvas.toDataURL();
					});
				}
			}

			logoImg.addEventListener('load', () => {
				generateLogoImg(logoImg);
			});
			logoImg.addEventListener('error', () => {
				console.error("Logo image can not load!");
			});

			logoImg.src = _htOption.logo;
		} else {
			drawQuietZoneColor();
			t._bIsPainted = true;

			if (_htOption.onRenderingEnd) {
				_htOption.onRenderingEnd(_htOption, function() {
					return t._canvas.toDataURL();
				});
			}
		}

	}

};



/**
 * Return whether the QRCode is painted or not
 *
 * @return {Boolean}
 */
Drawing.prototype.isPainted = function() {
	return this._bIsPainted;
};


/**
 * @private
 * @param {Number} nNumber
 */
Drawing.prototype.round = function(nNumber) {
	if (!nNumber) {
		return nNumber;
	}
	return Math.floor(nNumber * 1000) / 1000;
};


function QRCode(canvas, vOption) {
	this.canvas = canvas;
	this._htOption = {
		width: 256,
		height: 256,
		typeNumber: 4,
		colorDark: "#000000",
		colorLight: "#ffffff",
		correctLevel: QRErrorCorrectLevel.H,

		dotScale: 1, // For body block, must be greater than 0, less than or equal to 1. default is 1

		dotScaleTiming: 1, // Dafault for timing block , must be greater than 0, less than or equal to 1. default is 1
		dotScaleTiming_H: undefined, // For horizontal timing block, must be greater than 0, less than or equal to 1. default is 1
		dotScaleTiming_V: undefined, // For vertical timing block, must be greater than 0, less than or equal to 1. default is 1

		dotScaleA: 1, // Dafault for alignment block, must be greater than 0, less than or equal to 1. default is 1
		dotScaleAO: undefined, // For alignment outer block, must be greater than 0, less than or equal to 1. default is 1
		dotScaleAI: undefined, // For alignment inner block, must be greater than 0, less than or equal to 1. default is 1

		quietZone: 0,
		quietZoneColor: "rgba(0,0,0,0)",

		title: "",
		titleFont: "normal normal bold 16px Arial",
		titleColor: "#000000",
		titleBackgroundColor: "#ffffff",
		titleHeight: 0, // Title Height, Include subTitle
		titleTop: 30, // draws y coordinates. default is 30

		subTitle: "",
		subTitleFont: "normal normal normal 14px Arial",
		subTitleColor: "#4F4F4F",
		subTitleTop: 60, // draws y coordinates. default is 0

		logo: undefined,
		logoWidth: undefined,
		logoHeight: undefined,
		logoMaxWidth: undefined,
		logoMaxHeight: undefined,
		logoBackgroundColor: '#ffffff',
		logoBackgroundTransparent: false,

		// === Posotion Pattern(Eye) Color
		PO: undefined, // Global Posotion Outer color. if not set, the defaut is `colorDark`
		PI: undefined, // Global Posotion Inner color. if not set, the defaut is `colorDark`
		PO_TL: undefined, // Posotion Outer - Top Left
		PI_TL: undefined, // Posotion Inner - Top Left
		PO_TR: undefined, // Posotion Outer - Top Right
		PI_TR: undefined, // Posotion Inner - Top Right
		PO_BL: undefined, // Posotion Outer - Bottom Left
		PI_BL: undefined, // Posotion Inner - Bottom Left

		// === Alignment Color
		AO: undefined, // Alignment Outer. if not set, the defaut is `colorDark`
		AI: undefined, // Alignment Inner. if not set, the defaut is `colorDark`

		// === Timing Pattern Color
		timing: undefined, // Global Timing color. if not set, the defaut is `colorDark`
		timing_H: undefined, // Horizontal timing color
		timing_V: undefined, // Vertical timing color

		// ==== Backgroud Image
		backgroundImage: undefined, // Background Image
		backgroundImageAlpha: 1, // Background image transparency, value between 0 and 1. default is 1.
		autoColor: false, // Automatic color adjustment(for data block)
		autoColorDark: "rgba(0, 0, 0, .6)", // Automatic color: dark CSS color
		autoColorLight: "rgba(255, 255, 255, .7)", // Automatic color: light CSS color

		// ==== Event Handler
		onRenderingStart: undefined,
		onRenderingEnd: undefined,

		// ==== Versions
		version: 0, // The symbol versions of QR Code range from Version 1 to Version 40. default 0 means automatically choose the closest version based on the text length.

		// ==== binary(hex) data mode
		binary: false, // Whether it is binary mode, default is text mode. 

		// UTF-8 without BOM
		utf8WithoutBOM: true

	};
	if (typeof vOption === 'string') {
		vOption = {
			text: vOption
		};
	}

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

	if (!this._htOption.title && !this._htOption.subTitle) {
		this._htOption.titleHeight = 0;
	}

	if (this._htOption.version < 0 || this._htOption.version > 40) {
		console.warn("QR Code version '" + this._htOption.version + "' is invalidate, reset to 0")
		this._htOption.version = 0;
	}


	if (this._htOption.dotScale < 0 || this._htOption.dotScale > 1) {
		console.warn(this._htOption.dotScale +
			" , is invalidate, dotScale must greater than 0, less than or equal to 1, now reset to 1. ")
		this._htOption.dotScale = 1;
	}

	if (this._htOption.dotScaleTiming < 0 || this._htOption.dotScaleTiming > 1) {
		console.warn(this._htOption.dotScaleTiming +
			" , is invalidate, dotScaleTiming must greater than 0, less than or equal to 1, now reset to 1. "
		)
		this._htOption.dotScaleTiming = 1;
	}
	if (this._htOption.dotScaleTiming_H) {
		if (this._htOption.dotScaleTiming_H < 0 || this._htOption.dotScaleTiming_H > 1) {
			console.warn(this._htOption.dotScaleTiming_H +
				" , is invalidate, dotScaleTiming_H must greater than 0, less than or equal to 1, now reset to 1. "
			)
			this._htOption.dotScaleTiming_H = 1;
		}
	} else {
		this._htOption.dotScaleTiming_H = this._htOption.dotScaleTiming;
	}

	if (this._htOption.dotScaleTiming_V) {
		if (this._htOption.dotScaleTiming_V < 0 || this._htOption.dotScaleTiming_V > 1) {
			console.warn(this._htOption.dotScaleTiming_V +
				" , is invalidate, dotScaleTiming_V must greater than 0, less than or equal to 1, now reset to 1. "
			)
			this._htOption.dotScaleTiming_V = 1;
		}
	} else {
		this._htOption.dotScaleTiming_V = this._htOption.dotScaleTiming;
	}



	if (this._htOption.dotScaleA < 0 || this._htOption.dotScaleA > 1) {
		console.warn(this._htOption.dotScaleA +
			" , is invalidate, dotScaleA must greater than 0, less than or equal to 1, now reset to 1. "
		)
		this._htOption.dotScaleA = 1;
	}
	if (this._htOption.dotScaleAO) {
		if (this._htOption.dotScaleAO < 0 || this._htOption.dotScaleAO > 1) {
			console.warn(this._htOption.dotScaleAO +
				" , is invalidate, dotScaleAO must greater than 0, less than or equal to 1, now reset to 1. "
			)
			this._htOption.dotScaleAO = 1;
		}
	} else {
		this._htOption.dotScaleAO = this._htOption.dotScaleA;
	}
	if (this._htOption.dotScaleAI) {
		if (this._htOption.dotScaleAI < 0 || this._htOption.dotScaleAI > 1) {
			console.warn(this._htOption.dotScaleAI +
				" , is invalidate, dotScaleAI must greater than 0, less than or equal to 1, now reset to 1. "
			)
			this._htOption.dotScaleAI = 1;
		}
	} else {
		this._htOption.dotScaleAI = this._htOption.dotScaleA;
	}



	if (this._htOption.backgroundImageAlpha < 0 || this._htOption.backgroundImageAlpha > 1) {
		console.warn(this._htOption.backgroundImageAlpha +
			" , is invalidate, backgroundImageAlpha must between 0 and 1, now reset to 1. ")
		this._htOption.backgroundImageAlpha = 1;
	}

	this._htOption.height = this._htOption.height + this._htOption.titleHeight;

	this._oQRCode = null;
	this._oQRCode = new QRCodeModel(_getTypeNumber(this._htOption.text, this._htOption), this._htOption.correctLevel);
	this._oQRCode.addData(this._htOption.text, this._htOption.binary, this._htOption.utf8WithoutBOM);
	this._oQRCode.make();
	this._show();
}


QRCode.prototype._show = function() {
	var _oDrawing = new Drawing(this.canvas, Object.assign({}, this._htOption));
	this._oDrawing = _oDrawing;
	_oDrawing.draw(this._oQRCode);
};

/**
 * Make the QRCode
 * 
 * @param {String} sText link data
 */
QRCode.prototype.makeCode = function(sText) {

	this._oQRCode = new QRCodeModel(_getTypeNumber(sText, this._htOption), this._htOption.correctLevel);
	this._oQRCode.addData(sText, this._htOption.binary, this._htOption.utf8WithoutBOM);
	this._oQRCode.make();
	if (this._htOption.tooltip) {
		this._el.title = sText;
	}
	this._oDrawing.draw(this._oQRCode);
	//		this.makeImage();
};



/**
 * @name QRCode.CorrectLevel
 */
QRCode.CorrectLevel = QRErrorCorrectLevel;

export {
	QRCode,
	Canvas
};