onionr/static-data/www/shared/identicon.js

206 lines
7.1 KiB
JavaScript

/**
* Identicon.js 2.3.3
* http://github.com/stewartlord/identicon.js
*
* PNGLib required for PNG output
* http://www.xarg.org/download/pnglib.js
*
* Copyright 2018, Stewart Lord
* Released under the BSD license
* http://www.opensource.org/licenses/bsd-license.php
*/
(function() {
var PNGlib;
if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
PNGlib = require('./pnglib');
} else {
PNGlib = window.PNGlib;
}
var Identicon = function(hash, options){
if (typeof(hash) !== 'string' || hash.length < 15) {
throw 'A hash of at least 15 characters is required.';
}
this.defaults = {
background: [240, 240, 240, 255],
margin: 0.08,
size: 64,
saturation: 0.7,
brightness: 0.5,
format: 'png'
};
this.options = typeof(options) === 'object' ? options : this.defaults;
// backward compatibility with old constructor (hash, size, margin)
if (typeof(arguments[1]) === 'number') { this.options.size = arguments[1]; }
if (arguments[2]) { this.options.margin = arguments[2]; }
this.hash = hash
this.background = this.options.background || this.defaults.background;
this.size = this.options.size || this.defaults.size;
this.format = this.options.format || this.defaults.format;
this.margin = this.options.margin !== undefined ? this.options.margin : this.defaults.margin;
// foreground defaults to last 7 chars as hue at 70% saturation, 50% brightness
var hue = parseInt(this.hash.substr(-7), 16) / 0xfffffff;
var saturation = this.options.saturation || this.defaults.saturation;
var brightness = this.options.brightness || this.defaults.brightness;
this.foreground = this.options.foreground || this.hsl2rgb(hue, saturation, brightness);
};
Identicon.prototype = {
background: null,
foreground: null,
hash: null,
margin: null,
size: null,
format: null,
image: function(){
return this.isSvg()
? new Svg(this.size, this.foreground, this.background)
: new PNGlib(this.size, this.size, 256);
},
render: function(){
var image = this.image(),
size = this.size,
baseMargin = Math.floor(size * this.margin),
cell = Math.floor((size - (baseMargin * 2)) / 5),
margin = Math.floor((size - cell * 5) / 2),
bg = image.color.apply(image, this.background),
fg = image.color.apply(image, this.foreground);
// the first 15 characters of the hash control the pixels (even/odd)
// they are drawn down the middle first, then mirrored outwards
var i, color;
for (i = 0; i < 15; i++) {
color = parseInt(this.hash.charAt(i), 16) % 2 ? bg : fg;
if (i < 5) {
this.rectangle(2 * cell + margin, i * cell + margin, cell, cell, color, image);
} else if (i < 10) {
this.rectangle(1 * cell + margin, (i - 5) * cell + margin, cell, cell, color, image);
this.rectangle(3 * cell + margin, (i - 5) * cell + margin, cell, cell, color, image);
} else if (i < 15) {
this.rectangle(0 * cell + margin, (i - 10) * cell + margin, cell, cell, color, image);
this.rectangle(4 * cell + margin, (i - 10) * cell + margin, cell, cell, color, image);
}
}
return image;
},
rectangle: function(x, y, w, h, color, image){
if (this.isSvg()) {
image.rectangles.push({x: x, y: y, w: w, h: h, color: color});
} else {
var i, j;
for (i = x; i < x + w; i++) {
for (j = y; j < y + h; j++) {
image.buffer[image.index(i, j)] = color;
}
}
}
},
// adapted from: https://gist.github.com/aemkei/1325937
hsl2rgb: function(h, s, b){
h *= 6;
s = [
b += s *= b < .5 ? b : 1 - b,
b - h % 1 * s * 2,
b -= s *= 2,
b,
b + h % 1 * s,
b + s
];
return[
s[ ~~h % 6 ] * 255, // red
s[ (h|16) % 6 ] * 255, // green
s[ (h|8) % 6 ] * 255 // blue
];
},
toString: function(raw){
// backward compatibility with old toString, default to base64
if (raw) {
return this.render().getDump();
} else {
return this.render().getBase64();
}
},
isSvg: function(){
return this.format.match(/svg/i)
}
};
var Svg = function(size, foreground, background){
this.size = size;
this.foreground = this.color.apply(this, foreground);
this.background = this.color.apply(this, background);
this.rectangles = [];
};
Svg.prototype = {
size: null,
foreground: null,
background: null,
rectangles: null,
color: function(r, g, b, a){
var values = [r, g, b].map(Math.round);
values.push((a >= 0) && (a <= 255) ? a/255 : 1);
return 'rgba(' + values.join(',') + ')';
},
getDump: function(){
var i,
xml,
rect,
fg = this.foreground,
bg = this.background,
stroke = this.size * 0.005;
xml = "<svg xmlns='http://www.w3.org/2000/svg'"
+ " width='" + this.size + "' height='" + this.size + "'"
+ " style='background-color:" + bg + ";'>"
+ "<g style='fill:" + fg + "; stroke:" + fg + "; stroke-width:" + stroke + ";'>";
for (i = 0; i < this.rectangles.length; i++) {
rect = this.rectangles[i];
if (rect.color == bg) continue;
xml += "<rect "
+ " x='" + rect.x + "'"
+ " y='" + rect.y + "'"
+ " width='" + rect.w + "'"
+ " height='" + rect.h + "'"
+ "/>";
}
xml += "</g></svg>"
return xml;
},
getBase64: function(){
if ('function' === typeof btoa) {
return btoa(this.getDump());
} else if (Buffer) {
return new Buffer(this.getDump(), 'binary').toString('base64');
} else {
throw 'Cannot generate base64 output';
}
}
};
if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
module.exports = Identicon;
} else {
window.Identicon = Identicon;
}
})();