1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/**
* 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;
}
})();
|
