qartjs
Version:
qart.js merge picture and QR code.
2,011 lines (1,634 loc) • 89.9 kB
JavaScript
// ---------------------------------------------------------------------
//
// QR Code Generator 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
//
// ---------------------------------------------------------------------
var qrcode = (function () {
// ---------------------------------------------------------------------
// qrcode
// ---------------------------------------------------------------------
/**
* qrcode
* @param typeNumber 1 to 40
* @param errorCorrectionLevel 'L','M','Q','H'
*/
var qrcode = function (typeNumber, errorCorrectionLevel) {
var PAD0 = 0xEC
var PAD1 = 0x11
var _typeNumber = typeNumber
var _errorCorrectionLevel = QRErrorCorrectionLevel[errorCorrectionLevel]
var _modules = null
var _moduleCount = 0
var _dataCache = null
var _dataList = new Array()
var _this = {}
var makeImpl = function (test, maskPattern) {
_moduleCount = _typeNumber * 4 + 17
_modules = (function (moduleCount) {
var modules = new Array(moduleCount)
for (var row = 0; row < moduleCount; row += 1) {
modules[row] = new Array(moduleCount)
for (var col = 0; col < moduleCount; col += 1) {
modules[row][col] = null
}
}
return modules
}(_moduleCount))
setupPositionProbePattern(0, 0)
setupPositionProbePattern(_moduleCount - 7, 0)
setupPositionProbePattern(0, _moduleCount - 7)
setupPositionAdjustPattern()
setupTimingPattern()
setupTypeInfo(test, maskPattern)
if (_typeNumber >= 7) {
setupTypeNumber(test)
}
if (_dataCache == null) {
_dataCache = createData(_typeNumber, _errorCorrectionLevel, _dataList)
}
mapData(_dataCache, maskPattern)
}
var setupPositionProbePattern = function (row, col) {
for (var r = -1; r <= 7; r += 1) {
if (row + r <= -1 || _moduleCount <= row + r) continue
for (var c = -1; c <= 7; c += 1) {
if (col + c <= -1 || _moduleCount <= col + c) continue
if ((r >= 0 && r <= 6 && (c == 0 || c == 6)) ||
(c >= 0 && c <= 6 && (r == 0 || r == 6)) ||
(r >= 2 && r <= 4 && c >= 2 && c <= 4)) {
_modules[row + r][col + c] = true
} else {
_modules[row + r][col + c] = false
}
}
}
}
var getBestMaskPattern = function () {
var minLostPoint = 0
var pattern = 0
for (var i = 0; i < 8; i += 1) {
makeImpl(true, i)
var lostPoint = QRUtil.getLostPoint(_this)
if (i == 0 || minLostPoint > lostPoint) {
minLostPoint = lostPoint
pattern = i
}
}
return pattern
}
var setupTimingPattern = function () {
for (var r = 8; r < _moduleCount - 8; r += 1) {
if (_modules[r][6] != null) {
continue
}
_modules[r][6] = (r % 2 == 0)
}
for (var c = 8; c < _moduleCount - 8; c += 1) {
if (_modules[6][c] != null) {
continue
}
_modules[6][c] = (c % 2 == 0)
}
}
var setupPositionAdjustPattern = function () {
var pos = QRUtil.getPatternPosition(_typeNumber)
for (var i = 0; i < pos.length; i += 1) {
for (var j = 0; j < pos.length; j += 1) {
var row = pos[i]
var col = pos[j]
if (_modules[row][col] != null) {
continue
}
for (var r = -2; r <= 2; r += 1) {
for (var c = -2; c <= 2; c += 1) {
if (r == -2 || r == 2 || c == -2 || c == 2 ||
(r == 0 && c == 0)) {
_modules[row + r][col + c] = true
} else {
_modules[row + r][col + c] = false
}
}
}
}
}
}
var setupTypeNumber = function (test) {
var bits = QRUtil.getBCHTypeNumber(_typeNumber)
for (var i = 0; i < 18; i += 1) {
var mod = (!test && ((bits >> i) & 1) == 1)
_modules[Math.floor(i / 3)][i % 3 + _moduleCount - 8 - 3] = mod
}
for (var i = 0; i < 18; i += 1) {
var mod = (!test && ((bits >> i) & 1) == 1)
_modules[i % 3 + _moduleCount - 8 - 3][Math.floor(i / 3)] = mod
}
}
var setupTypeInfo = function (test, maskPattern) {
var data = (_errorCorrectionLevel << 3) | maskPattern
var bits = QRUtil.getBCHTypeInfo(data)
// vertical
for (var i = 0; i < 15; i += 1) {
var mod = (!test && ((bits >> i) & 1) == 1)
if (i < 6) {
_modules[i][8] = mod
} else if (i < 8) {
_modules[i + 1][8] = mod
} else {
_modules[_moduleCount - 15 + i][8] = mod
}
}
// horizontal
for (var i = 0; i < 15; i += 1) {
var mod = (!test && ((bits >> i) & 1) == 1)
if (i < 8) {
_modules[8][_moduleCount - i - 1] = mod
} else if (i < 9) {
_modules[8][15 - i - 1 + 1] = mod
} else {
_modules[8][15 - i - 1] = mod
}
}
// fixed module
_modules[_moduleCount - 8][8] = (!test)
}
var mapData = function (data, maskPattern) {
var inc = -1
var row = _moduleCount - 1
var bitIndex = 7
var byteIndex = 0
var maskFunc = QRUtil.getMaskFunction(maskPattern)
for (var col = _moduleCount - 1; col > 0; col -= 2) {
if (col == 6) col -= 1
while (true) {
for (var c = 0; c < 2; c += 1) {
if (_modules[row][col - c] == null) {
var dark = false
if (byteIndex < data.length) {
dark = (((data[byteIndex] >>> bitIndex) & 1) == 1)
}
var mask = maskFunc(row, col - c)
if (mask) {
dark = !dark
}
_modules[row][col - c] = dark
bitIndex -= 1
if (bitIndex == -1) {
byteIndex += 1
bitIndex = 7
}
}
}
row += inc
if (row < 0 || _moduleCount <= row) {
row -= inc
inc = -inc
break
}
}
}
}
var 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 += 1) {
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 += 1) {
dcdata[r][i] = 0xff & buffer.getBuffer()[i + offset]
}
offset += dcCount
var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount)
var rawPoly = 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 += 1) {
var modIndex = i + modPoly.getLength() - ecdata[r].length
ecdata[r][i] = (modIndex >= 0) ? modPoly.getAt(modIndex) : 0
}
}
var totalCodeCount = 0
for (var i = 0; i < rsBlocks.length; i += 1) {
totalCodeCount += rsBlocks[i].totalCount
}
var data = new Array(totalCodeCount)
var index = 0
for (var i = 0; i < maxDcCount; i += 1) {
for (var r = 0; r < rsBlocks.length; r += 1) {
if (i < dcdata[r].length) {
data[index] = dcdata[r][i]
index += 1
}
}
}
for (var i = 0; i < maxEcCount; i += 1) {
for (var r = 0; r < rsBlocks.length; r += 1) {
if (i < ecdata[r].length) {
data[index] = ecdata[r][i]
index += 1
}
}
}
return data
}
function CodeLengthOverflow (message) {
this.message = message
this.name = 'CodeLengthOverflow'
}
// CodeLengthOverflow.prototype = new Error();
var createData = function (typeNumber, errorCorrectionLevel, dataList) {
var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectionLevel)
var buffer = qrBitBuffer()
for (var i = 0; i < dataList.length; i += 1) {
var data = dataList[i]
buffer.put(data.getMode(), 4)
buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber))
data.write(buffer)
}
// calc num max data.
var totalDataCount = 0
for (var i = 0; i < rsBlocks.length; i += 1) {
totalDataCount += rsBlocks[i].dataCount
}
if (buffer.getLengthInBits() > totalDataCount * 8) {
throw new CodeLengthOverflow('code length overflow. (' +
buffer.getLengthInBits() +
'>' +
totalDataCount * 8 +
')')
}
// end code
if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
buffer.put(0, 4)
}
// padding
while (buffer.getLengthInBits() % 8 != 0) {
buffer.putBit(false)
}
// padding
while (true) {
if (buffer.getLengthInBits() >= totalDataCount * 8) {
break
}
buffer.put(PAD0, 8)
if (buffer.getLengthInBits() >= totalDataCount * 8) {
break
}
buffer.put(PAD1, 8)
}
return createBytes(buffer, rsBlocks)
}
_this.addData = function (data, mode) {
mode = mode || 'Byte'
var newData = null
switch (mode) {
case 'Numeric' :
newData = qrNumber(data)
break
case 'Alphanumeric' :
newData = qrAlphaNum(data)
break
case 'Byte' :
newData = qr8BitByte(data)
break
case 'Kanji' :
newData = qrKanji(data)
break
default :
throw 'mode:' + mode
}
_dataList.push(newData)
_dataCache = null
}
_this.isDark = function (row, col) {
if (row < 0 || _moduleCount <= row || col < 0 || _moduleCount <= col) {
throw new Error(row + ',' + col)
}
return _modules[row][col]
}
_this.getModuleCount = function () {
return _moduleCount
}
_this.make = function () {
makeImpl(false, getBestMaskPattern())
}
_this.createTableTag = function (cellSize, margin) {
cellSize = cellSize || 2
margin = (typeof margin === 'undefined') ? cellSize * 4 : margin
var qrHtml = ''
qrHtml += '<table style="'
qrHtml += ' border-width: 0px; border-style: none;'
qrHtml += ' border-collapse: collapse;'
qrHtml += ' padding: 0px; margin: ' + margin + 'px;'
qrHtml += '">'
qrHtml += '<tbody>'
for (var r = 0; r < _this.getModuleCount(); r += 1) {
qrHtml += '<tr>'
for (var c = 0; c < _this.getModuleCount(); c += 1) {
qrHtml += '<td style="'
qrHtml += ' border-width: 0px; border-style: none;'
qrHtml += ' border-collapse: collapse;'
qrHtml += ' padding: 0px; margin: 0px;'
qrHtml += ' width: ' + cellSize + 'px;'
qrHtml += ' height: ' + cellSize + 'px;'
qrHtml += ' background-color: '
qrHtml += _this.isDark(r, c) ? '#000000' : '#ffffff'
qrHtml += ';'
qrHtml += '"/>'
}
qrHtml += '</tr>'
}
qrHtml += '</tbody>'
qrHtml += '</table>'
return qrHtml
}
_this.createSvgTag = function (cellSize, margin) {
cellSize = cellSize || 2
margin = (typeof margin === 'undefined') ? cellSize * 4 : margin
var size = _this.getModuleCount() * cellSize + margin * 2
var c, mc, r, mr, qrSvg = '', rect
rect = 'l' + cellSize + ',0 0,' + cellSize +
' -' + cellSize + ',0 0,-' + cellSize + 'z '
qrSvg += '<svg'
qrSvg += ' width="' + size + 'px"'
qrSvg += ' height="' + size + 'px"'
qrSvg += ' xmlns="http://www.w3.org/2000/svg"'
qrSvg += '>'
qrSvg += '<path d="'
for (r = 0; r < _this.getModuleCount(); r += 1) {
mr = r * cellSize + margin
for (c = 0; c < _this.getModuleCount(); c += 1) {
if (_this.isDark(r, c)) {
mc = c * cellSize + margin
qrSvg += 'M' + mc + ',' + mr + rect
}
}
}
qrSvg += '" stroke="transparent" fill="black"/>'
qrSvg += '</svg>'
return qrSvg
}
_this.createImgTag = function (cellSize, margin) {
cellSize = cellSize || 2
margin = (typeof margin === 'undefined') ? cellSize * 4 : margin
var size = _this.getModuleCount() * cellSize + margin * 2
var min = margin
var max = size - margin
return createImgTag(size, size, function (x, y) {
if (min <= x && x < max && min <= y && y < max) {
var c = Math.floor((x - min) / cellSize)
var r = Math.floor((y - min) / cellSize)
return _this.isDark(r, c) ? 0 : 1
} else {
return 1
}
})
}
_this.createImgObject = function (cellSize, margin) {
cellSize = cellSize || 2
margin = (typeof margin === 'undefined') ? cellSize * 4 : margin
var size = _this.getModuleCount() * cellSize + margin * 2
var min = margin
var max = size - margin
return createImgObject(size, size, function (x, y) {
if (min <= x && x < max && min <= y && y < max) {
var c = Math.floor((x - min) / cellSize)
var r = Math.floor((y - min) / cellSize)
return _this.isDark(r, c) ? 0 : 1
} else {
return 1
}
})
}
return _this
}
var createImgObject = function (width, height, getPixel) {
var gif = gifImage(width, height)
for (var y = 0; y < height; y += 1) {
for (var x = 0; x < width; x += 1) {
gif.setPixel(x, y, getPixel(x, y))
}
}
var b = byteArrayOutputStream()
gif.write(b)
var base64 = base64EncodeOutputStream()
var bytes = b.toByteArray()
for (var i = 0; i < bytes.length; i += 1) {
base64.writeByte(bytes[i])
}
base64.flush()
var img = new Image()
img.src = 'data:image/gif;base64,' + base64
img.width = width
img.height = height
return img
}
// ---------------------------------------------------------------------
// qrcode.stringToBytes
// ---------------------------------------------------------------------
qrcode.stringToBytesFuncs = {
'default': function (s) {
var bytes = []
for (var i = 0; i < s.length; i += 1) {
var c = s.charCodeAt(i)
bytes.push(c & 0xff)
}
return bytes
}
}
qrcode.stringToBytes = qrcode.stringToBytesFuncs['default']
// ---------------------------------------------------------------------
// qrcode.createStringToBytes
// ---------------------------------------------------------------------
/**
* @param unicodeData base64 string of byte array.
* [16bit Unicode],[16bit Bytes], ...
* @param numChars
*/
qrcode.createStringToBytes = function (unicodeData, numChars) {
// create conversion map.
var unicodeMap = (function () {
var bin = base64DecodeInputStream(unicodeData)
var read = function () {
var b = bin.read()
if (b == -1) throw new Error()
return b
}
var count = 0
var unicodeMap = {}
while (true) {
var b0 = bin.read()
if (b0 == -1) break
var b1 = read()
var b2 = read()
var b3 = read()
var k = String.fromCharCode((b0 << 8) | b1)
var v = (b2 << 8) | b3
unicodeMap[k] = v
count += 1
}
if (count != numChars) {
throw new Error(count + ' != ' + numChars)
}
return unicodeMap
}())
var unknownChar = '?'.charCodeAt(0)
return function (s) {
var bytes = new Array()
for (var i = 0; i < s.length; i += 1) {
var c = s.charCodeAt(i)
if (c < 128) {
bytes.push(c)
} else {
var b = unicodeMap[s.charAt(i)]
if (typeof b === 'number') {
if ((b & 0xff) == b) {
// 1byte
bytes.push(b)
} else {
// 2bytes
bytes.push(b >>> 8)
bytes.push(b & 0xff)
}
} else {
bytes.push(unknownChar)
}
}
}
return bytes
}
}
// ---------------------------------------------------------------------
// QRMode
// ---------------------------------------------------------------------
var QRMode = {
MODE_NUMBER: 1 << 0,
MODE_ALPHA_NUM: 1 << 1,
MODE_8BIT_BYTE: 1 << 2,
MODE_KANJI: 1 << 3
}
// ---------------------------------------------------------------------
// QRErrorCorrectionLevel
// ---------------------------------------------------------------------
var QRErrorCorrectionLevel = {
L: 1,
M: 0,
Q: 3,
H: 2
}
// ---------------------------------------------------------------------
// QRMaskPattern
// ---------------------------------------------------------------------
var QRMaskPattern = {
PATTERN000: 0,
PATTERN001: 1,
PATTERN010: 2,
PATTERN011: 3,
PATTERN100: 4,
PATTERN101: 5,
PATTERN110: 6,
PATTERN111: 7
}
// ---------------------------------------------------------------------
// QRUtil
// ---------------------------------------------------------------------
var QRUtil = (function () {
var 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]
]
var G15 = (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0)
var G18 = (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0)
var G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1)
var _this = {}
var getBCHDigit = function (data) {
var digit = 0
while (data != 0) {
digit += 1
data >>>= 1
}
return digit
}
_this.getBCHTypeInfo = function (data) {
var d = data << 10
while (getBCHDigit(d) - getBCHDigit(G15) >= 0) {
d ^= (G15 << (getBCHDigit(d) - getBCHDigit(G15)))
}
return ((data << 10) | d) ^ G15_MASK
}
_this.getBCHTypeNumber = function (data) {
var d = data << 12
while (getBCHDigit(d) - getBCHDigit(G18) >= 0) {
d ^= (G18 << (getBCHDigit(d) - getBCHDigit(G18)))
}
return (data << 12) | d
}
_this.getPatternPosition = function (typeNumber) {
return PATTERN_POSITION_TABLE[typeNumber - 1]
}
_this.getMaskFunction = function (maskPattern) {
switch (maskPattern) {
case QRMaskPattern.PATTERN000 :
return function (i, j) { return (i + j) % 2 == 0 }
case QRMaskPattern.PATTERN001 :
return function (i, j) { return i % 2 == 0 }
case QRMaskPattern.PATTERN010 :
return function (i, j) { return j % 3 == 0 }
case QRMaskPattern.PATTERN011 :
return function (i, j) { return (i + j) % 3 == 0 }
case QRMaskPattern.PATTERN100 :
return function (i, j) { return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0 }
case QRMaskPattern.PATTERN101 :
return function (i, j) { return (i * j) % 2 + (i * j) % 3 == 0 }
case QRMaskPattern.PATTERN110 :
return function (i, j) { return ((i * j) % 2 + (i * j) % 3) % 2 == 0 }
case QRMaskPattern.PATTERN111 :
return function (i, j) { return ((i * j) % 3 + (i + j) % 2) % 2 == 0 }
default :
throw new Error('bad maskPattern:' + maskPattern)
}
}
_this.getErrorCorrectPolynomial = function (errorCorrectLength) {
var a = qrPolynomial([1], 0)
for (var i = 0; i < errorCorrectLength; i += 1) {
a = a.multiply(qrPolynomial([1, QRMath.gexp(i)], 0))
}
return a
}
_this.getLengthInBits = function (mode, type) {
if (type >= 1 && type < 10) {
// 1 - 9
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) {
// 10 - 26
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) {
// 27 - 40
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)
}
}
_this.getLostPoint = function (qrcode) {
var moduleCount = qrcode.getModuleCount()
var lostPoint = 0
// LEVEL1
for (var row = 0; row < moduleCount; row += 1) {
for (var col = 0; col < moduleCount; col += 1) {
var sameCount = 0
var dark = qrcode.isDark(row, col)
for (var r = -1; r <= 1; r += 1) {
if (row + r < 0 || moduleCount <= row + r) {
continue
}
for (var c = -1; c <= 1; c += 1) {
if (col + c < 0 || moduleCount <= col + c) {
continue
}
if (r == 0 && c == 0) {
continue
}
if (dark == qrcode.isDark(row + r, col + c)) {
sameCount += 1
}
}
}
if (sameCount > 5) {
lostPoint += (3 + sameCount - 5)
}
}
};
// LEVEL2
for (var row = 0; row < moduleCount - 1; row += 1) {
for (var col = 0; col < moduleCount - 1; col += 1) {
var count = 0
if (qrcode.isDark(row, col)) count += 1
if (qrcode.isDark(row + 1, col)) count += 1
if (qrcode.isDark(row, col + 1)) count += 1
if (qrcode.isDark(row + 1, col + 1)) count += 1
if (count == 0 || count == 4) {
lostPoint += 3
}
}
}
// LEVEL3
for (var row = 0; row < moduleCount; row += 1) {
for (var col = 0; col < moduleCount - 6; col += 1) {
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 += 1) {
for (var row = 0; row < moduleCount - 6; row += 1) {
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
}
}
}
// LEVEL4
var darkCount = 0
for (var col = 0; col < moduleCount; col += 1) {
for (var row = 0; row < moduleCount; row += 1) {
if (qrcode.isDark(row, col)) {
darkCount += 1
}
}
}
var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5
lostPoint += ratio * 10
return lostPoint
}
return _this
}())
// ---------------------------------------------------------------------
// QRMath
// ---------------------------------------------------------------------
var QRMath = (function () {
var EXP_TABLE = new Array(256)
var LOG_TABLE = new Array(256)
// initialize tables
for (var i = 0; i < 8; i += 1) {
EXP_TABLE[i] = 1 << i
}
for (var i = 8; i < 256; i += 1) {
EXP_TABLE[i] = EXP_TABLE[i - 4] ^
EXP_TABLE[i - 5] ^
EXP_TABLE[i - 6] ^
EXP_TABLE[i - 8]
}
for (var i = 0; i < 255; i += 1) {
LOG_TABLE[EXP_TABLE[i] ] = i
}
var _this = {}
_this.glog = function (n) {
if (n < 1) {
throw new Error('glog(' + n + ')')
}
return LOG_TABLE[n]
}
_this.gexp = function (n) {
while (n < 0) {
n += 255
}
while (n >= 256) {
n -= 255
}
return EXP_TABLE[n]
}
return _this
}())
// ---------------------------------------------------------------------
// qrPolynomial
// ---------------------------------------------------------------------
function qrPolynomial (num, shift) {
if (typeof num.length === 'undefined') {
throw new Error(num.length + '/' + shift)
}
var _num = (function () {
var offset = 0
while (offset < num.length && num[offset] == 0) {
offset += 1
}
var _num = new Array(num.length - offset + shift)
for (var i = 0; i < num.length - offset; i += 1) {
_num[i] = num[i + offset]
}
return _num
}())
var _this = {}
_this.getAt = function (index) {
return _num[index]
}
_this.getLength = function () {
return _num.length
}
_this.multiply = function (e) {
var num = new Array(_this.getLength() + e.getLength() - 1)
for (var i = 0; i < _this.getLength(); i += 1) {
for (var j = 0; j < e.getLength(); j += 1) {
num[i + j] ^= QRMath.gexp(QRMath.glog(_this.getAt(i)) + QRMath.glog(e.getAt(j)))
}
}
return qrPolynomial(num, 0)
}
_this.mod = function (e) {
if (_this.getLength() - e.getLength() < 0) {
return _this
}
var ratio = QRMath.glog(_this.getAt(0)) - QRMath.glog(e.getAt(0))
var num = new Array(_this.getLength())
for (var i = 0; i < _this.getLength(); i += 1) {
num[i] = _this.getAt(i)
}
for (var i = 0; i < e.getLength(); i += 1) {
num[i] ^= QRMath.gexp(QRMath.glog(e.getAt(i)) + ratio)
}
// recursive call
return qrPolynomial(num, 0).mod(e)
}
return _this
};
// ---------------------------------------------------------------------
// QRRSBlock
// ---------------------------------------------------------------------
var QRRSBlock = (function () {
var RS_BLOCK_TABLE = [
// L
// M
// Q
// H
// 1
[1, 26, 19],
[1, 26, 16],
[1, 26, 13],
[1, 26, 9],
// 2
[1, 44, 34],
[1, 44, 28],
[1, 44, 22],
[1, 44, 16],
// 3
[1, 70, 55],
[1, 70, 44],
[2, 35, 17],
[2, 35, 13],
// 4
[1, 100, 80],
[2, 50, 32],
[2, 50, 24],
[4, 25, 9],
// 5
[1, 134, 108],
[2, 67, 43],
[2, 33, 15, 2, 34, 16],
[2, 33, 11, 2, 34, 12],
// 6
[2, 86, 68],
[4, 43, 27],
[4, 43, 19],
[4, 43, 15],
// 7
[2, 98, 78],
[4, 49, 31],
[2, 32, 14, 4, 33, 15],
[4, 39, 13, 1, 40, 14],
// 8
[2, 121, 97],
[2, 60, 38, 2, 61, 39],
[4, 40, 18, 2, 41, 19],
[4, 40, 14, 2, 41, 15],
// 9
[2, 146, 116],
[3, 58, 36, 2, 59, 37],
[4, 36, 16, 4, 37, 17],
[4, 36, 12, 4, 37, 13],
// 10
[2, 86, 68, 2, 87, 69],
[4, 69, 43, 1, 70, 44],
[6, 43, 19, 2, 44, 20],
[6, 43, 15, 2, 44, 16],
// 11
[4, 101, 81],
[1, 80, 50, 4, 81, 51],
[4, 50, 22, 4, 51, 23],
[3, 36, 12, 8, 37, 13],
// 12
[2, 116, 92, 2, 117, 93],
[6, 58, 36, 2, 59, 37],
[4, 46, 20, 6, 47, 21],
[7, 42, 14, 4, 43, 15],
// 13
[4, 133, 107],
[8, 59, 37, 1, 60, 38],
[8, 44, 20, 4, 45, 21],
[12, 33, 11, 4, 34, 12],
// 14
[3, 145, 115, 1, 146, 116],
[4, 64, 40, 5, 65, 41],
[11, 36, 16, 5, 37, 17],
[11, 36, 12, 5, 37, 13],
// 15
[5, 109, 87, 1, 110, 88],
[5, 65, 41, 5, 66, 42],
[5, 54, 24, 7, 55, 25],
[11, 36, 12, 7, 37, 13],
// 16
[5, 122, 98, 1, 123, 99],
[7, 73, 45, 3, 74, 46],
[15, 43, 19, 2, 44, 20],
[3, 45, 15, 13, 46, 16],
// 17
[1, 135, 107, 5, 136, 108],
[10, 74, 46, 1, 75, 47],
[1, 50, 22, 15, 51, 23],
[2, 42, 14, 17, 43, 15],
// 18
[5, 150, 120, 1, 151, 121],
[9, 69, 43, 4, 70, 44],
[17, 50, 22, 1, 51, 23],
[2, 42, 14, 19, 43, 15],
// 19
[3, 141, 113, 4, 142, 114],
[3, 70, 44, 11, 71, 45],
[17, 47, 21, 4, 48, 22],
[9, 39, 13, 16, 40, 14],
// 20
[3, 135, 107, 5, 136, 108],
[3, 67, 41, 13, 68, 42],
[15, 54, 24, 5, 55, 25],
[15, 43, 15, 10, 44, 16],
// 21
[4, 144, 116, 4, 145, 117],
[17, 68, 42],
[17, 50, 22, 6, 51, 23],
[19, 46, 16, 6, 47, 17],
// 22
[2, 139, 111, 7, 140, 112],
[17, 74, 46],
[7, 54, 24, 16, 55, 25],
[34, 37, 13],
// 23
[4, 151, 121, 5, 152, 122],
[4, 75, 47, 14, 76, 48],
[11, 54, 24, 14, 55, 25],
[16, 45, 15, 14, 46, 16],
// 24
[6, 147, 117, 4, 148, 118],
[6, 73, 45, 14, 74, 46],
[11, 54, 24, 16, 55, 25],
[30, 46, 16, 2, 47, 17],
// 25
[8, 132, 106, 4, 133, 107],
[8, 75, 47, 13, 76, 48],
[7, 54, 24, 22, 55, 25],
[22, 45, 15, 13, 46, 16],
// 26
[10, 142, 114, 2, 143, 115],
[19, 74, 46, 4, 75, 47],
[28, 50, 22, 6, 51, 23],
[33, 46, 16, 4, 47, 17],
// 27
[8, 152, 122, 4, 153, 123],
[22, 73, 45, 3, 74, 46],
[8, 53, 23, 26, 54, 24],
[12, 45, 15, 28, 46, 16],
// 28
[3, 147, 117, 10, 148, 118],
[3, 73, 45, 23, 74, 46],
[4, 54, 24, 31, 55, 25],
[11, 45, 15, 31, 46, 16],
// 29
[7, 146, 116, 7, 147, 117],
[21, 73, 45, 7, 74, 46],
[1, 53, 23, 37, 54, 24],
[19, 45, 15, 26, 46, 16],
// 30
[5, 145, 115, 10, 146, 116],
[19, 75, 47, 10, 76, 48],
[15, 54, 24, 25, 55, 25],
[23, 45, 15, 25, 46, 16],
// 31
[13, 145, 115, 3, 146, 116],
[2, 74, 46, 29, 75, 47],
[42, 54, 24, 1, 55, 25],
[23, 45, 15, 28, 46, 16],
// 32
[17, 145, 115],
[10, 74, 46, 23, 75, 47],
[10, 54, 24, 35, 55, 25],
[19, 45, 15, 35, 46, 16],
// 33
[17, 145, 115, 1, 146, 116],
[14, 74, 46, 21, 75, 47],
[29, 54, 24, 19, 55, 25],
[11, 45, 15, 46, 46, 16],
// 34
[13, 145, 115, 6, 146, 116],
[14, 74, 46, 23, 75, 47],
[44, 54, 24, 7, 55, 25],
[59, 46, 16, 1, 47, 17],
// 35
[12, 151, 121, 7, 152, 122],
[12, 75, 47, 26, 76, 48],
[39, 54, 24, 14, 55, 25],
[22, 45, 15, 41, 46, 16],
// 36
[6, 151, 121, 14, 152, 122],
[6, 75, 47, 34, 76, 48],
[46, 54, 24, 10, 55, 25],
[2, 45, 15, 64, 46, 16],
// 37
[17, 152, 122, 4, 153, 123],
[29, 74, 46, 14, 75, 47],
[49, 54, 24, 10, 55, 25],
[24, 45, 15, 46, 46, 16],
// 38
[4, 152, 122, 18, 153, 123],
[13, 74, 46, 32, 75, 47],
[48, 54, 24, 14, 55, 25],
[42, 45, 15, 32, 46, 16],
// 39
[20, 147, 117, 4, 148, 118],
[40, 75, 47, 7, 76, 48],
[43, 54, 24, 22, 55, 25],
[10, 45, 15, 67, 46, 16],
// 40
[19, 148, 118, 6, 149, 119],
[18, 75, 47, 31, 76, 48],
[34, 54, 24, 34, 55, 25],
[20, 45, 15, 61, 46, 16]
]
var qrRSBlock = function (totalCount, dataCount) {
var _this = {}
_this.totalCount = totalCount
_this.dataCount = dataCount
return _this
}
var _this = {}
var getRsBlockTable = function (typeNumber, errorCorrectionLevel) {
switch (errorCorrectionLevel) {
case QRErrorCorrectionLevel.L :
return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0]
case QRErrorCorrectionLevel.M :
return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1]
case QRErrorCorrectionLevel.Q :
return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2]
case QRErrorCorrectionLevel.H :
return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3]
default :
return undefined
}
}
_this.getRSBlocks = function (typeNumber, errorCorrectionLevel) {
var rsBlock = getRsBlockTable(typeNumber, errorCorrectionLevel)
if (typeof rsBlock === 'undefined') {
throw new Error('bad rs block @ typeNumber:' + typeNumber +
'/errorCorrectionLevel:' + errorCorrectionLevel)
}
var length = rsBlock.length / 3
var list = new Array()
for (var i = 0; i < length; i += 1) {
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 += 1) {
list.push(qrRSBlock(totalCount, dataCount))
}
}
return list
}
return _this
}())
// ---------------------------------------------------------------------
// qrBitBuffer
// ---------------------------------------------------------------------
var qrBitBuffer = function () {
var _buffer = new Array()
var _length = 0
var _this = {}
_this.getBuffer = function () {
return _buffer
}
_this.getAt = function (index) {
var bufIndex = Math.floor(index / 8)
return ((_buffer[bufIndex] >>> (7 - index % 8)) & 1) == 1
}
_this.put = function (num, length) {
for (var i = 0; i < length; i += 1) {
_this.putBit(((num >>> (length - i - 1)) & 1) == 1)
}
}
_this.getLengthInBits = function () {
return _length
}
_this.putBit = function (bit) {
var bufIndex = Math.floor(_length / 8)
if (_buffer.length <= bufIndex) {
_buffer.push(0)
}
if (bit) {
_buffer[bufIndex] |= (0x80 >>> (_length % 8))
}
_length += 1
}
return _this
}
// ---------------------------------------------------------------------
// qrNumber
// ---------------------------------------------------------------------
var qrNumber = function (data) {
var _mode = QRMode.MODE_NUMBER
var _data = data
var _this = {}
_this.getMode = function () {
return _mode
}
_this.getLength = function (buffer) {
return _data.length
}
_this.write = function (buffer) {
var data = _data
var i = 0
while (i + 2 < data.length) {
buffer.put(strToNum(data.substring(i, i + 3)), 10)
i += 3
}
if (i < data.length) {
if (data.length - i == 1) {
buffer.put(strToNum(data.substring(i, i + 1)), 4)
} else if (data.length - i == 2) {
buffer.put(strToNum(data.substring(i, i + 2)), 7)
}
}
}
var strToNum = function (s) {
var num = 0
for (var i = 0; i < s.length; i += 1) {
num = num * 10 + chatToNum(s.charAt(i))
}
return num
}
var chatToNum = function (c) {
if (c >= '0' && c <= '9') {
return c.charCodeAt(0) - '0'.charCodeAt(0)
}
throw 'illegal char :' + c
}
return _this
}
// ---------------------------------------------------------------------
// qrAlphaNum
// ---------------------------------------------------------------------
var qrAlphaNum = function (data) {
var _mode = QRMode.MODE_ALPHA_NUM
var _data = data
var _this = {}
_this.getMode = function () {
return _mode
}
_this.getLength = function (buffer) {
return _data.length
}
_this.write = function (buffer) {
var s = _data
var i = 0
while (i + 1 < s.length) {
buffer.put(
getCode(s.charAt(i)) * 45 +
getCode(s.charAt(i + 1)), 11)
i += 2
}
if (i < s.length) {
buffer.put(getCode(s.charAt(i)), 6)
}
}
var getCode = function (c) {
if (c >= '0' && c <= '9') {
return c.charCodeAt(0) - '0'.charCodeAt(0)
} else if (c >= 'A' && c <= 'Z') {
return c.charCodeAt(0) - 'A'.charCodeAt(0) + 10
} else {
switch (c) {
case ' ' : return 36
case '$' : return 37
case '%' : return 38
case '*' : return 39
case '+' : return 40
case '-' : return 41
case '.' : return 42
case '/' : return 43
case ':' : return 44
default :
throw 'illegal char :' + c
}
}
}
return _this
}
// ---------------------------------------------------------------------
// qr8BitByte
// ---------------------------------------------------------------------
var qr8BitByte = function (data) {
var _mode = QRMode.MODE_8BIT_BYTE
var _data = data
var _bytes = qrcode.stringToBytes(data)
var _this = {}
_this.getMode = function () {
return _mode
}
_this.getLength = function (buffer) {
return _bytes.length
}
_this.write = function (buffer) {
for (var i = 0; i < _bytes.length; i += 1) {
buffer.put(_bytes[i], 8)
}
}
return _this
}
// ---------------------------------------------------------------------
// qrKanji
// ---------------------------------------------------------------------
var qrKanji = function (data) {
var _mode = QRMode.MODE_KANJI
var _data = data
var _bytes = qrcode.stringToBytesFuncs['SJIS']
!(function (c, code) {
// self test for sjis support.
var test = qrcode.stringToBytes(c)
if (test.length != 2 || ((test[0] << 8) | test[1]) != code) {
throw 'sjis not supported.'
}
}('\u53cb', 0x9746))
var _this = {}
_this.getMode = function () {
return _mode
}
_this.getLength = function (buffer) {
return ~~(_bytes.length / 2)
}
_this.write = function (buffer) {
var data = _bytes
var i = 0
while (i + 1 < data.length) {
var c = ((0xff & data[i]) << 8) | (0xff & data[i + 1])
if (c >= 0x8140 && c <= 0x9FFC) {
c -= 0x8140
} else if (c >= 0xE040 && c <= 0xEBBF) {
c -= 0xC140
} else {
throw 'illegal char at ' + (i + 1) + '/' + c
}
c = ((c >>> 8) & 0xff) * 0xC0 + (c & 0xff)
buffer.put(c, 13)
i += 2
}
if (i < data.length) {
throw 'illegal char at ' + (i + 1)
}
}
return _this
}
// =====================================================================
// GIF Support etc.
//
// ---------------------------------------------------------------------
// byteArrayOutputStream
// ---------------------------------------------------------------------
var byteArrayOutputStream = function () {
var _bytes = new Array()
var _this = {}
_this.writeByte = function (b) {
_bytes.push(b & 0xff)
}
_this.writeShort = function (i) {
_this.writeByte(i)
_this.writeByte(i >>> 8)
}
_this.writeBytes = function (b, off, len) {
off = off || 0
len = len || b.length
for (var i = 0; i < len; i += 1) {
_this.writeByte(b[i + off])
}
}
_this.writeString = function (s) {
for (var i = 0; i < s.length; i += 1) {
_this.writeByte(s.charCodeAt(i))
}
}
_this.toByteArray = function () {
return _bytes
}
_this.toString = function () {
var s = ''
s += '['
for (var i = 0; i < _bytes.length; i += 1) {
if (i > 0) {
s += ','
}
s += _bytes[i]
}
s += ']'
return s
}
return _this
}
// ---------------------------------------------------------------------
// base64EncodeOutputStream
// ---------------------------------------------------------------------
var base64EncodeOutputStream = function () {
var _buffer = 0
var _buflen = 0
var _length = 0
var _base64 = ''
var _this = {}
var writeEncoded = function (b) {
_base64 += String.fromCharCode(encode(b & 0x3f))
}
var encode = function (n) {
if (n < 0) {
// error.
} else if (n < 26) {
return 0x41 + n
} else if (n < 52) {
return 0x61 + (n - 26)
} else if (n < 62) {
return 0x30 + (n - 52)
} else if (n == 62) {
return 0x2b
} else if (n == 63) {
return 0x2f
}
throw new Error('n:' + n)
}
_this.writeByte = function (n) {
_buffer = (_buffer << 8) | (n & 0xff)
_buflen += 8
_length += 1
while (_buflen >= 6) {
writeEncoded(_buffer >>> (_buflen - 6))
_buflen -= 6
}
}
_this.flush = function () {
if (_buflen > 0) {
writeEncoded(_buffer << (6 - _buflen))
_buffer = 0
_buflen = 0
}
if (_length % 3 != 0) {
// padding
var padlen = 3 - _length % 3
for (var i = 0; i < padlen; i += 1) {
_base64 += '='
}
}
}
_this.toString = function () {
return _base64
}
return _this
}
// ---------------------------------------------------------------------
// base64DecodeInputStream
// ---------------------------------------------------------------------
var base64DecodeInputStream = function (str) {
var _str = str
var _pos = 0
var _buffer = 0
var _buflen = 0
var _this = {}
_this.read = function () {
while (_buflen < 8) {
if (_pos >= _str.length) {
if (_buflen == 0) {
return -1
}
throw new Error('unexpected end of file./' + _buflen)
}
var c = _str.charAt(_pos)
_pos += 1
if (c == '=') {
_buflen = 0
return -1
} else if (c.match(/^\s$/)) {
// ignore if whitespace.
continue
}
_buffer = (_buffer << 6) | decode(c.charCodeAt(0))
_buflen += 6
}
var n = (_buffer >>> (_buflen - 8)) & 0xff
_buflen -= 8
return n
}
var decode = function (c) {
if (c >= 0x41 && c <= 0x5a) {
return c - 0x41
} else if (c >= 0x61 && c <= 0x7a) {
return c - 0x61 + 26
} else if (c >= 0x30 && c <= 0x39) {
return c - 0x30 + 52
} else if (c == 0x2b) {
return 62
} else if (c == 0x2f) {
return 63
} else {
throw new Error('c:' + c)
}
}
return _this
}
// ---------------------------------------------------------------------
// gifImage (B/W)
// ---------------------------------------------------------------------
var gifImage = function (width, height) {
var _width = width
var _height = height
var _data = new Array(width * height)
var _this = {}
_this.setPixel = function (x, y, pixel) {
_data[y * _width + x] = pixel
}
_this.write = function (out) {
// ---------------------------------
// GIF Signature
out.writeString('GIF87a')
// ---------------------------------
// Screen Descriptor
out.writeShort(_width)
out.writeShort(_height)
out.writeByte(0x80) // 2bit
out.writeByte(0)
out.writeByte(0)
// ---------------------------------
// Global Color Map
// black
out.writeByte(0x00)
out.writeByte(0x00)
out.writeByte(0x00)
// white
out.writeByte(0xff)
out.writeByte(0xff)
out.writeByte(0xff)
// ---------------------------------
// Image Descriptor
out.writeString(',')
out.writeShort(0)
out.writeShort(0)
out.writeShort(_width)
out.writeShort(_height)
out.writeByte(0)
// ---------------------------------
// Local Color Map
// ---------------------------------
// Raster Data
var lzwMinCodeSize = 2
var raster = getLZWRaster(lzwMinCodeSize)
out.writeByte(lzwMinCodeSize)
var offset = 0
while (raster.length - offset > 255) {
out.writeByte(255)
out.writeBytes(raster, offset, 255)
offset += 255
}
out.writeByte(raster.length - offset)
out.writeBytes(raster, offset, raster.length - offset)
out.writeByte(0x00)
// ---------------------------------
// GIF Terminator
out.writeString(';')
}
var bitOutputStream = function (out) {
var _out = out
var _bitLength = 0
var _bitBuffer = 0
var _this = {}
_this.write = function (data, length) {
if ((data >>> length) != 0) {
throw new Error('length over')
}
while (_bitLength + length >= 8) {
_out.writeByte(0xff & ((data << _bitLength) | _bitBuffer))
length -= (8 - _bitLength)
data >>>= (8 - _bitLength)
_bitBuffer = 0
_bitLength = 0
}
_bitBuffer = (data << _bitLength) | _bitBuffer
_bitLength = _bitLength + length
}
_this.flush = function () {
if (_bitLength > 0) {
_out.writeByte(_bitBuffer)
}
}
return _this
}
var getLZWRaster = function (lzwMinCodeSize) {
var clearCode = 1 << lzwMinCodeSize
var endCode = (1 << lzwMinCodeSize) + 1
var bitLength = lzwMinCodeSize + 1
// Setup LZWTable
var table = lzwTable()
for (var i = 0; i < clearCode; i += 1) {
table.add(String.fromCharCode(i))
}
table.add(String.fromCharCode(clearCode))
table.add(String.fromCharCode(endCode))
var byteOut = byteArrayOutputStream()
var bitOut = bitOutputStream(byteOut)
// clear code
bitOut.write(clearCode, bitLength)
var dataIndex = 0
var s = String.fromCharCode(_data[dataIndex])
dataIndex += 1
while (dataIndex < _data.length) {
var c = String.fromCharCode(_data[dataIndex])
dataIndex += 1
if (table.contains(s + c)) {
s = s + c
} else {
bitOut.write(table.indexOf(s), bitLength)
if (table.size() < 0xfff) {
if (table.size() == (1 << bitLength)) {
bitLength += 1
}
table.add(s + c)
}
s = c
}
}
bitOut.write(table.indexOf(s), bitLength)
// end code
bitOut.write(endCode, bitLength)
bitOut.flush()
return byteOut.toByteArray()
}
var lzwTable = function () {
var _map = {}
var _size = 0
var _this = {}
_this.add = function (key) {
if (_this.contains(key)) {
throw new Error('dup key:' + key)
}
_map[key] = _size
_size += 1
}
_this.size = function () {
return _size
}
_this.indexOf = function (key) {
return _map[key]
}
_this.contains = function (key) {
return typeof _map[key] !== 'undefined'
}
return _this
}
return _this
}
var createImgTag = function (width, height, getPixel, alt) {
var gif = gifImage(width, height)
for (var y = 0; y < height; y += 1) {
for (var x = 0; x < width; x += 1) {
gif.setPixel(x, y, getPixel(x, y))
}
}
var b = byteArrayOutputStream()
gif.write(b)
var base64 = base64EncodeOutputStream()
var bytes = b.toByteArray()
for (var i = 0; i < bytes.length; i += 1) {
base64.writeByte(bytes[i])
}
base64.flush()
var img = ''
img += '<img'
img += '\u0020src="'
img += 'data:image/gif;base64,'
img += base64
img += '"'
img += '\u0020width="'
img += width
img += '"'
img += '\u0020height="'
img += height
img += '"'
if (alt) {
img += '\u0020alt="'
img += alt
img += '"'
}
img += '/>'
return img