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qrcodedecode.js
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qrcodedecode.js
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/* ************************************************************
QR-Logo: http://qrlogo.kaarposoft.dk
Copyright (C) 2011 Henrik Kaare Poulsen
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.
*/
/* ************************************************************ */
/* Settings for http://www.jslint.com/
*/
/*jslint browser: true */
/*jslint bitwise: true */
/*jslint vars: true */
/*jslint white: true */
/*jslint plusplus: true */
/*jslint continue: true */
/*global alert: true */
/*global ReedSolomon: true */
/* ************************************************************ */
/* JavaScript STRICT mode
*/
"use strict";
/* ************************************************************
* QRCodeDecode CONSTRUCTOR
* ************************************************************
*/
/** @class
* Encode or decode QR Code
*/
function QRCodeDecode() {
this.logger = null;
this.debug_addText = true;
this.debug_encodeWithErrorCorrection = true;
this.debug_encodeBestMask = true;
this.debug_addErrorCorrection = true;
this.debug_setBlocks = true;
this.debug_findModuleSize = true;
this.debug_extractCodewords = true;
this.debug_extractData = true;
this.debug_correctErrors = true;
this.debug_insane = false;
this.image = null;
this.image_top = 0;
this.image_bottom = 0;
this.image_left = 0;
this.image_right = 0;
this.n_modules = 0;
this.module_size = 0;
this.version = 0;
this.functional_grade = 0;
this.error_correction_level = 0;
this.mask = 0;
this.mask_pattern = [];
this.n_block_ec_words = 0;
this.block_indices = [];
this.block_data_lengths = [];
}
/* ************************************************************
* QRCodeDecode PROTOTYPE
* ************************************************************
*/
QRCodeDecode.prototype = {
/* ************************************************************
* QRCodeDecode CONSTANTS
* ************************************************************
*/
/** Mode according to ISO/IEC 18004:2006(E) Section 6.3 */
MODE: {
Numeric: 1,
AlphaNumeric: 2,
EightBit: 4,
Terminator: 0
},
/** Error correction level according to ISO/IEC 18004:2006(E) Section 6.5.1 */
ERROR_CORRECTION_LEVEL: {
L: 1, // 7%
M: 0, // 15%
Q: 3, // 25%
H: 2 // 30%
},
/* ************************************************************
* QRCodeDecode MAIN ENCODE FUNCTIONS TO BE CALLED BY CLIENTS
* ************************************************************
*/
/** Encode a text into a QR Code in a canvas
*
* @param mode Mode according to ISO/IEC 18004:2006(E) Section 6.3
* @param text The text to be encoded
* @param version Version according to ISO/IEC 18004:2006(E) Section 5.3.1
* @param ec_level Error correction level according to ISO/IEC 18004:2006(E) Section 6.5.1
* @param module_size Number of pixels per module
* @param canvas The canvas to encode into
* @param bg_rgb Array [r, g, b] where 0<=color<=255
* @param module_rgb Array [r, g, b] where 0<=color<=255
*/
encodeToCanvas: function (mode, text, version, ec_level, module_size, canvas, bg_rgb, module_rgb) {
if (!bg_rgb) { bg_rgb = [0.98, 0.98, 1.0]; }
if (!module_rgb) { module_rgb = [0.3, 0.05, 0.05]; }
var ctx = canvas.getContext('2d');
canvas.setBackground = function () {
ctx.fillStyle = "rgb(" + Math.round(bg_rgb[0]*255) + "," + Math.round(bg_rgb[1]*255) + "," + Math.round(bg_rgb[2]*255) + ")";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = "rgb(" + Math.round(module_rgb[0]*255) + "," + Math.round(module_rgb[1]*255) + "," + Math.round(module_rgb[2]*255) + ")";
};
canvas.setDark = function (x, y, d) {
ctx.fillRect(x, y, d, d);
};
this.encodeInit(version, ec_level, module_size, canvas);
this.encodeAddText(mode, text);
this.encode();
},
/* ************************************************************ */
/** Encode text into a QR Code in a pixel array
*
* @param mode Mode according to ISO/IEC 18004:2006(E) Section 6.3
* @param text The text to be encoded
* @param version Version according to ISO/IEC 18004:2006(E) Section 5.3.1
* @param ec_level Error correction level according to ISO/IEC 18004:2006(E) Section 6.5.1
*/
encodeToPixarray: function (mode, text, version, ec_level) {
var n_modules = this.nModulesFromVersion(version)+4+4;
var pix = {};
pix.width = n_modules;
pix.height = n_modules;
pix.arr = [];
var i;
for (i = 0; i < n_modules; i++) {
pix.arr[i] = [];
}
pix.setBackground = function () {
for (i = 0; i < n_modules; i++) {
var j;
for (j = 0; j < n_modules; j++) {
this.arr[i][j] = false;
}
}
};
pix.setDark = function (x, y, d) {
// Ignoring d, since a pixel array has d=1
// TODO: Investigate why we have wrong X coordinate sometimes ???
if (x > n_modules-1) { return; }
this.arr[x][y] = true;
};
pix.isDark = function (x, y, d) {
// Ignoring d, since a pixel array has d=1
if (x > this.n_modules-1) { return false; }
return pix.arr[x][y];
};
this.encodeInit(version, ec_level, 1, pix);
this.encodeAddText(mode, text);
this.encode();
return pix;
},
/* ************************************************************ */
/** Prepare for encoding text to QR Code
*
* @param version Version according to ISO/IEC 18004:2006(E) Section 5.3.1
* @param ec_level Error correction level according to ISO/IEC 18004:2006(E) Section 6.5.1
* @param module_size Number of pixels per module
* @param canvas Canvas or pixel array
*/
encodeInit: function (version, ec_level, module_size, canvas) {
this.version = version;
this.error_correction_level = ec_level;
this.module_size = module_size;
this.n_modules = this.nModulesFromVersion(version);
this.image = canvas;
this.image_top = 4*module_size;
this.image_left = 4*module_size;
this.image.width = (4+4+this.n_modules)*module_size;
this.image.height = (4+4+this.n_modules)*module_size;
this.image.setBackground();
this.bit_idx = 0;
this.setBlocks();
this.data = [];
var i;
for (i = 0; i < this.n_data_codewords; i++) { this.data[i] = 0; }
this.pixels = [];
for (i = 0; i < this.n_modules; i++) { this.pixels[i] = []; }
},
/* ************************************************************ */
/** Add text to a QR code
*
* @param mode Mode according to ISO/IEC 18004:2006(E) Section 6.3
* @param text The text to be encoded
*/
encodeAddText: function (mode, text) {
this.addTextImplementation(mode, text);
},
/* ************************************************************ */
/** Encode this class to an image/canvas.
*/
encode: function () {
this.addTextImplementation(this.MODE.Terminator, null);
this.appendPadding();
this.addErrorCorrection();
this.encodeBestMask();
this.pixelsToImage();
},
/* ************************************************************
* QRCodeDecode MAIN DECODE FUNCTIONS TO BE CALLED BY CLIENTS
* ************************************************************
*/
/** Decode a pixel array */
decodePixarray: function (pix) {
return this.decodeImage(pix);
},
/* ************************************************************ */
/** Decode image data as QR Code
*
* @param image_data The image data (canvas.getContext('2d').getImageData, pixel array or similar)
* @param image_width The pixel width of the image
* @param image_height The pixel height of the image
*/
decodeImageData: function (image_data, image_width, image_height) {
this.setImageData(image_data, image_width, image_height);
return this.decode();
},
/* ************************************************************ */
/** Decode image data as QR Code
*
* @param image_data The image data (canvas.getContext('2d').getImageData, pixel array or similar)
* @param image_width The pixel width of the image
* @param image_height The pixel height of the image
* @param left Leftmost pixel of image
* @param right Rightmost pixel of image
* @param top Top pixel of image
* @param bottom Bottom pixel of image
* @param max_version Do not try to decode with version higher than this
*/
decodeImageDataInsideBordersWithMaxVersion: function (image_data, image_width, image_height, left, right, top, bottom, max_version) {
this.setImageData(image_data, image_width, image_height);
this.image_left = left;
this.image_right = right;
this.image_top = top;
this.image_bottom = bottom;
this.image_size = ( (this.image_right-this.image_left+1) + (this.image_bottom-this.image_top+1) ) / 2.0;
this.max_version = max_version;
return this.decodeInsideBordersWithMaxVersion();
},
/* ************************************************************ */
/** Set image data in preparation for decoding QR Code
*
* @param image_data The image data (canvas.getContext('2d').getImageData, pixel array or similar)
* @param image_width The pixel width of the image
* @param image_height The pixel height of the image
*/
setImageData: function (image_data, image_width, image_height) {
image_data.min_col = 255;
image_data.max_col = 0;
var total = 0;
var x, y;
for (x = 0; x < image_width; x++) {
for (y = 0; y < image_height; y++) {
var p = x*4 + y*image_width*4;
var v = 0.30*image_data.data[p] + 0.59*image_data.data[p+1] + 0.11*image_data.data[p+2];
total += v;
if (v < image_data.min_col) { image_data.min_col = v; }
if (v > image_data.max_col) { image_data.max_col = v; }
}
}
if (image_data.max_col-image_data.min_col < 255/10) {
throw ("Image does not have enough contrast (this.image_data.min_col=" + image_data.min_col + " this.image_data.max_col=" + image_data.max_col+")");
}
image_data.threshold = total / (image_width*image_height);
//image_data.threshold = (image_data.max_col+image_data.min_col)/2;
image_data.getGray = function (x, y, d) {
var n = 0;
var i;
for (i = x; i < x+d; i++) {
var j;
for (j = y; j < y+d; j++) {
var p = i*4 + j*this.width*4;
n = n + 0.30*this.data[p] + 0.59*this.data[p+1] + 0.11*this.data[p+2];
}
}
return n/d/d;
};
image_data.isDark = function (x, y, d) {
var g = this.getGray(x, y, d);
return g < this.threshold;
};
this.image = image_data;
},
/* ************************************************************ */
/** Decode a QR Code in an image.
* The image MUST already have .getGray set
*/
decodeImage: function (image) {
this.image = image;
return this.decode();
},
/* ************************************************************ */
/** Decode a QR Code in an image which has already been set.
*/
decode: function () {
this.findImageBorders();
this.max_version = 40;
this.decodeInsideBordersWithMaxVersion();
return this.data;
},
/* ************************************************************ */
/** Decode a QR Code in an image which has already been set -
* inside borders already defined
*/
decodeInsideBordersWithMaxVersion: function () {
this.findModuleSize();
this.setFunctionalPattern();
this.extractCodewords();
this.setBlocks();
this.correctErrors();
this.extractData();
return this.data;
},
/* ************************************************************
* QRCodeDecode INTERNAL ENCODING FUNCTIONS
* ************************************************************
*/
addTextImplementation: function (mode, text) {
function appendBits(bytes, pos, len, value) {
var byteIndex = pos >>> 3;
var shift = 24 - (pos & 7) - len;
var v = value << shift;
bytes[byteIndex+2] = v & 0xFF;
v = v >>> 8;
bytes[byteIndex+1] = v & 0xFF;
v = v >>> 8;
bytes[byteIndex] += v & 0xFF;
}
/* ************************************************************ */
function getAlphaNum(qr, ch) {
if (!qr.alphanum_rev.hasOwnProperty(ch)) {
throw ("Invalid character for Alphanumeric encoding [" + ch + "]");
}
return qr.alphanum_rev[ch];
}
/* ************************************************************ */
function addAlphaNum(qr, text) {
var n = text.length;
var n_count_bits = qr.nCountBits(qr.MODE.AlphaNumeric, qr.version);
appendBits(qr.data, qr.bit_idx, n_count_bits, n);
qr.bit_idx += n_count_bits;
var i;
for (i = 0; i < n-1; i += 2) {
var val = 45 * getAlphaNum(qr, text[i]) + getAlphaNum(qr, text[i+1]);
appendBits(qr.data, qr.bit_idx, 11, val);
qr.bit_idx += 11;
}
if (n%2) {
appendBits(qr.data, qr.bit_idx, 6, getAlphaNum(qr, text[n-1]));
qr.bit_idx += 6;
}
}
/* ************************************************************ */
function add8bit(qr, text) {
var n_count_bits = qr.nCountBits(qr.MODE.EightBit, qr.version);
appendBits(qr.data, qr.bit_idx, n_count_bits, text.length);
qr.bit_idx += n_count_bits;
var i;
for (i = 0; i < text.length; i++) {
appendBits(qr.data, qr.bit_idx, 8, text[i].charCodeAt());
qr.bit_idx += 8;
}
}
/* ************************************************************ */
function addNumeric(qr, text) {
var n = text.length;
var n_count_bits = qr.nCountBits(qr.MODE.Numeric, qr.version);
appendBits(qr.data, qr.bit_idx, n_count_bits, n);
qr.bit_idx += n_count_bits;
var num = [];
var val;
var i;
for (i = 0; i < n; i++) {
var ch = text[i].charCodeAt()-48;
if ( (ch<0) || (ch>9) ) {
throw ("Invalid character for Numeric encoding [" + text[i] + "]");
}
num.push(ch);
}
for (i = 0; i < n-2; i += 3) {
val = 100*num[i]+10*num[i+1]+num[i+2];
appendBits(qr.data, qr.bit_idx, 10, val);
qr.bit_idx += 10;
}
if (n%3 === 1) {
val = num[n-1];
appendBits(qr.data, qr.bit_idx, 4, val);
qr.bit_idx += 4;
} else if (n%3 === 2) {
val = 10*num[n-2]+num[n-1];
appendBits(qr.data, qr.bit_idx, 7, val);
qr.bit_idx += 7;
}
}
/* ************************************************************
* addTextImplementation
*/
appendBits(this.data, this.bit_idx, 4, mode);
this.bit_idx += 4;
if (mode === this.MODE.AlphaNumeric) { addAlphaNum(this, text); }
else if (mode === this.MODE.EightBit) { add8bit(this, text); }
else if (mode === this.MODE.Numeric) { addNumeric(this, text); }
else if (mode === this.MODE.Terminator) { return; }
else { throw ("Unsupported ECI mode: " + mode); }
if (this.debug_addText) {
if (this.logger) {
this.logger.debug("addTextImplementation data = " + this.data.join(","));
}
}
if (this.debug_addText) {
if (this.logger) {
this.logger.debug("addTextImplementation bit_idx/8=" + this.bit_idx/8 + " n=" + this.n_data_codewords);
}
}
if (this.bit_idx/8 > this.n_data_codewords) {
throw ("Text too long for this EC version");
}
},
/* ************************************************************ */
appendPadding: function () {
var i;
for (i = Math.floor((this.bit_idx-1)/8)+1; i < this.n_data_codewords; i+=2) {
this.data[i] = 0xEC;
this.data[i+1] = 0x11;
}
},
/* ************************************************************ */
addErrorCorrection: function () {
if (this.debug_addText) {
if (this.logger) {
this.logger.debug("addErrorCorrection data = " + this.data.join(","));
}
}
var rs = new ReedSolomon(this.n_block_ec_words);
if (this.debug_addErrorCorrection) { rs.logger = this.logger; }
var bytes = [];
var n = 0;
var b;
for (b = 0; b < this.block_data_lengths.length; b++) {
var m = this.block_data_lengths[b];
var bytes_in = this.data.slice(n, n+m);
n += m;
var i;
for (i = 0; i < m; i++) {
bytes[this.block_indices[b][i]] = bytes_in[i];
}
var bytes_out = rs.encode(bytes_in);
for (i = 0; i < bytes_out.length; i++) {
bytes[this.block_indices[b][m+i]] = bytes_out[i];
}
}
if (this.debug_addErrorCorrection) {
if (this.logger) {
this.logger.debug("addErrorCorrection bytes = " + bytes.join(","));
}
}
this.bytes = bytes;
},
/* ************************************************************ */
calculatePenalty: function (mask) {
// TODO: Verify all penalty calculations
/* ************************************************************ */
function penaltyAdjacent(qr) {
var p = 0;
var i;
for (i = 0; i < qr.n_modules; i++) {
var n_dark = [0, 0];
var n_light = [0, 0];
var rc;
for (rc = 0; rc <= 1; rc++) {
var j;
for (j = 0; j < qr.n_modules; j++) {
if (qr.pixels[rc*i+(1-rc)*j][(1-rc)*i+rc*j]) {
if (n_light[rc] > 5) { p += (3+n_light[rc]-5); }
n_light[rc] = 0;
n_dark[rc]++;
} else {
if (n_dark[rc] > 5) { p += (3+n_dark[rc]-5); }
n_light[rc]++;
n_dark[rc] = 0;
}
}
if (n_light[rc] > 5) { p += (3+n_light[rc]-5); }
if (n_dark[rc] > 5) { p += (3+n_dark[rc]-5); }
}
}
return p;
}
/* ************************************************************ */
function penaltyBlocks(qr) {
// Not clear from ISO standard, if blocks have to be rectangular?
// Here we give 3 penalty to every 2x2 block, so odd shaped areas will have penalties as well as rectangles
var p = 0;
var i;
for (i = 0; i < qr.n_modules-1; i++) {
var j;
for (j = 0; j < qr.n_modules-1; j++) {
var b = 0;
if (qr.pixels[i] [j] ) { b++; }
if (qr.pixels[i+1][j] ) { b++; }
if (qr.pixels[i] [j+1]) { b++; }
if (qr.pixels[i+1][j+1]) { b++; }
if ( (b === 0) || (b === 4) ) { p += 3; }
}
}
return p;
}
/* ************************************************************ */
function binFormat(b) {
return ("00000000000000" + b.toString(2)).slice(-15);
}
/* ************************************************************ */
function penaltyDarkLight(qr) {
// we shift bits in one by one, and see if the resulting pattern match the bad one
var p = 0;
var bad = ( 128-1 - 2 - 32 ) << 4; // 4_ : 1D : 1L : 3D : 1L : 1D : 4x
var badmask1 = 2048 - 1 ; // 4_ : 1D : 1L : 3D : 1L : 1D : 4L
var badmask2 = badmask1 << 4; // 4L : 1D : 1L : 3D : 1L : 1D : 4_
var patmask = 32768 - 1; // 4 + 7 + 4
var i;
for (i = 0; i < qr.n_modules-1; i++) {
var pat = [0, 0];
var j;
for (j = 0; j < qr.n_modules-1; j++) {
var rc;
for (rc = 0; rc <= 1; rc++) {
pat[rc] = (pat[rc]<<1)&patmask;
if (qr.pixels[rc*i+(1-rc)*j][(1-rc)*i+rc*j]) { pat[rc]++; }
if (qr.debug_insane) {
qr.logger.debug(
"PENALTY p=" + p +
" x=" + (rc*i+(1-rc)*j) +
" y=" + ((1-rc)*i+rc*j) +
" pat=" + binFormat(pat[rc]) +
" b1=" + binFormat(pat[rc]&badmask1) +
" p2=" + binFormat(pat[rc]&badmask2) +
" bad=" + binFormat(bad));
}
if (j>=7+4) {
if ( (pat[rc]&badmask1) === bad ) {
p += 40;
} else {
if (j<qr.n_modules-4-7) {
if ( (pat[rc]&badmask2) === bad ) { p += 40; }
}
}
}
}
}
}
return p;
}
/* ************************************************************ */
function penaltyDark(qr) {
var dark = 0;
var i;
for (i = 0; i < qr.n_modules-1; i++) {
var j;
for (j = 0; j < qr.n_modules-1; j++) {
if (qr.pixels[i][j]) { dark++; }
}
}
return 10*Math.floor(Math.abs(dark/(qr.n_modules*qr.n_modules)-0.5)/0.05);
}
/* ************************************************************ */
/* calculatePenalty
*/
var p_adjacent = penaltyAdjacent(this);
var p_blocks = penaltyBlocks(this);
var p_darkLight = penaltyDarkLight(this);
var p_dark = penaltyDark(this);
var p_total = p_adjacent + p_blocks + p_darkLight + p_dark;
if (this.debug_encodeBestMask) {
if (this.logger) {
this.logger.debug("mask=" + mask + " penalty=" + p_total + " (" + p_adjacent + ", " + p_blocks + ", " + p_darkLight + ", " + p_dark + ")");
}
}
return p_total;
},
/* ************************************************************ */
encodeBestMask: function () {
var best_mask = 0;
var best_penalty = 999999;
this.setFunctionalPattern();
var mask;
var i;
var j;
for (mask = 0; mask < 8; mask++) {
for (i = 0; i < this.n_modules; i++) {
for (j = 0; j < this.n_modules; j++) {
this.pixels[i][j]=false;
}
}
this.encodeFunctionalPatterns(mask);
this.encodeData(mask);
var penalty = this.calculatePenalty(mask);
if (penalty<best_penalty) {
best_penalty = penalty;
best_mask = mask;
}
}
if (this.debug_encodeBestMask) {
if (this.logger) {
this.logger.debug("best_mask=" + best_mask + " best_penalty=" + best_penalty);
}
}
this.mask = best_mask;
if (this.mask !== 7) {
for (i = 0; i < this.n_modules; i++) {
for (j = 0; j < this.n_modules; j++) {
this.pixels[i][j]=false;
}
}
this.encodeFunctionalPatterns(this.mask);
this.encodeData(this.mask);
}
},
/* ************************************************************ */
encodeFunctionalPatterns: function (mask) {
function encodeFinderPattern(qr, x, y) {
var i, j;
// Outer 7x7 black boundary
for (i = 0; i <= 5; i++) {
qr.pixels[x+i][y] = true;
qr.pixels[x+6][y+i] = true;
qr.pixels[x+6-i][y+6] = true;
qr.pixels[x][y+6-i] = true;
}
// Inner 3*3 black box
for (i = 2; i <= 4; i++) {
for (j = 2; j <= 4; j++) {
qr.pixels[x+i][y+j] = true;
}
}
}
/* ************************************************************ */
function encodeVersionTopright(qr) {
var pattern = qr.version_info[qr.version];
var y;
for (y = 0; y < 6; y++) {
var x;
for (x = qr.n_modules-11; x < qr.n_modules-11+3; x++) {
if (pattern & 1) { qr.pixels[x][y]=true; }
pattern /= 2;
}
}
}
/* ************************************************************ */
function encodeVersionBottomleft(qr) {
var pattern = qr.version_info[qr.version];
var x;
for (x = 0; x < 6; x++) {
var y;
for (y = qr.n_modules-11; y < qr.n_modules-11+3; y++) {
if (pattern & 1) { qr.pixels[x][y]=true; }
pattern /= 2;
}
}
}
/* ************************************************************ */
function encodeTimingPattern(qr, horizontal) {
var i;
for (i = 8; i < qr.n_modules-8; i += 2) {
if (horizontal) {
qr.pixels[i][6]=true;
} else {
qr.pixels[6][i]=true;
}
}
}
/* ************************************************************ */
function encodeOneAlignmentPattern(qr, x, y) {
// Outer 5x5 black boundary
var i;
for (i = 0; i <= 3; i++) {
qr.pixels[x+i][ y] = true;
qr.pixels[x+4][ y+i] = true;
qr.pixels[x+4-i][y+4] = true;
qr.pixels[x][ y+4-i] = true;
}
// center black
qr.pixels[x+2][y+2] = true;
}
/* ************************************************************ */
function encodeAlignmentPatterns(qr) {
var n = qr.alignment_patterns[qr.version].length;
var i;
for (i = 0; i < n; i++) {
var j;
for (j = 0; j < n; j++) {
if ( ((i===0)&&(j===0)) || ((i===0)&&(j===n-1)) || ((i===n-1)&&(j===0)) ) { continue; }
encodeOneAlignmentPattern(qr, qr.alignment_patterns[qr.version][i]-2, qr.alignment_patterns[qr.version][j]-2);
}
}
}
/* ************************************************************ */
function encodeFormatNW(qr, code) {
var x = 8;
var y;
for (y = 0; y <= 5; y++) {
if (code&1) { qr.pixels[x][y] = true; }
code /= 2;
}
if (code&1) { qr.pixels[8][7]=true; }
code /= 2;
if (code&1) { qr.pixels[8][8]=true; }
code /= 2;
if (code&1) { qr.pixels[7][8]=true; }
code /= 2;
y = 8;
for (x = 5; x >= 0; x--) {
if (code&1) { qr.pixels[x][y] = true; }
code /= 2;
}
}
/* ************************************************************ */
function encodeFormatNESW(qr, code) {
var y = 8;
var x;
for (x = qr.n_modules-1; x > qr.n_modules-1-8; x--) {
if (code&1) { qr.pixels[x][y] = true; }
code /= 2;
}
x = 8;
for (y = qr.n_modules-7; y < qr.n_modules-1; y++) {
if (code&1) { qr.pixels[x][y] = true; }
code /= 2;
}
}
/* ************************************************************
* encodeFunctionalPatterns
*/
encodeFinderPattern(this, 0, 0);
encodeFinderPattern(this, 0, this.n_modules-7);
encodeFinderPattern(this, this.n_modules-7, 0);
if (this.version>=7) {
encodeVersionTopright(this);
encodeVersionBottomleft(this);
}
encodeTimingPattern(this, true);
encodeTimingPattern(this, false);
if (this.version > 1) { encodeAlignmentPatterns(this); }
var code = this.format_info[mask+8*this.error_correction_level];
encodeFormatNW(this, code);
encodeFormatNESW(this, code);
},
/* ************************************************************ */
encodeData: function (qrmask) {
function setMasked(pixels, mask, j, i, f) {
var m;
switch (mask) {
case 0:
m = (i + j) % 2;
break;
case 1:
m = i % 2;
break;
case 2:
m = j % 3;
break;
case 3:
m = (i + j) % 3;
break;
case 4:
m = (Math.floor(i / 2) + Math.floor(j / 3)) % 2;
break;
case 5:
m = (i * j) % 2 + (i * j) % 3;
break;
case 6:
m = ((i * j) % 2 + (i * j) % 3) % 2;
break;
case 7:
m = ((i+j) % 2 + (i * j) % 3) % 2;
break;
}
if (m === 0) {
pixels[j][i] = !f;
} else {
pixels[j][i] = f;
}
}
/* ************************************************************ */
/* encodeData
*/
var writingUp = true;
var n = 0;
var v = this.bytes[n];
var bitsWritten = 0;
var mask = (1<<7);
var j;
// Write columns in pairs, from right to left
for (j = this.n_modules - 1; j > 0; j -= 2) {
if (j === 6) {
// Skip whole column with vertical alignment pattern;
// saves time and makes the other code proceed more cleanly
j--;
}
// Read alternatingly from bottom to top then top to bottom
var count;
for (count = 0; count < this.n_modules; count++) {
var i = writingUp ? this.n_modules - 1 - count : count;
var col;
for (col = 0; col < 2; col++) {
// Ignore bits covered by the function pattern
if (!this.functional_pattern[j - col][i]) {
setMasked(this.pixels, qrmask, j - col, i, v & mask);
mask = (mask>>>1);
bitsWritten++;
if (bitsWritten === 8) {
bitsWritten = 0;
mask = (1<<7);
n++;
v = this.bytes[n];
}
}
}
}
writingUp ^= true; // writingUp = !writingUp; // switch directions
}
},
/* ************************************************************ */