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-rw-r--r--ui/lib/blockies.js364
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diff --git a/ui/lib/blockies.js b/ui/lib/blockies.js
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+(function (global, factory) {
+ typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+ typeof define === 'function' && define.amd ? define(['exports'], factory) :
+ (factory((global.blockies = {})));
+}(this, (function (exports) { 'use strict';
+
+ /**
+ * A handy class to calculate color values.
+ *
+ * @version 1.0
+ * @author Robert Eisele <robert@xarg.org>
+ * @copyright Copyright (c) 2010, Robert Eisele
+ * @link http://www.xarg.org/2010/03/generate-client-side-png-files-using-javascript/
+ * @license http://www.opensource.org/licenses/bsd-license.php BSD License
+ *
+ */
+
+
+// helper functions for that ctx
+ function write(buffer, offs) {
+ for (var i = 2; i < arguments.length; i++) {
+ for (var j = 0; j < arguments[i].length; j++) {
+ buffer[offs++] = arguments[i].charAt(j);
+ }
+ }
+ }
+
+ function byte2(w) {
+ return String.fromCharCode((w >> 8) & 255, w & 255);
+ }
+
+ function byte4(w) {
+ return String.fromCharCode((w >> 24) & 255, (w >> 16) & 255, (w >> 8) & 255, w & 255);
+ }
+
+ function byte2lsb(w) {
+ return String.fromCharCode(w & 255, (w >> 8) & 255);
+ }
+
+ var PNG = function(width,height,depth) {
+
+ this.width = width;
+ this.height = height;
+ this.depth = depth;
+
+ // pixel data and row filter identifier size
+ this.pix_size = height * (width + 1);
+
+ // deflate header, pix_size, block headers, adler32 checksum
+ this.data_size = 2 + this.pix_size + 5 * Math.floor((0xfffe + this.pix_size) / 0xffff) + 4;
+
+ // offsets and sizes of Png chunks
+ this.ihdr_offs = 0; // IHDR offset and size
+ this.ihdr_size = 4 + 4 + 13 + 4;
+ this.plte_offs = this.ihdr_offs + this.ihdr_size; // PLTE offset and size
+ this.plte_size = 4 + 4 + 3 * depth + 4;
+ this.trns_offs = this.plte_offs + this.plte_size; // tRNS offset and size
+ this.trns_size = 4 + 4 + depth + 4;
+ this.idat_offs = this.trns_offs + this.trns_size; // IDAT offset and size
+ this.idat_size = 4 + 4 + this.data_size + 4;
+ this.iend_offs = this.idat_offs + this.idat_size; // IEND offset and size
+ this.iend_size = 4 + 4 + 4;
+ this.buffer_size = this.iend_offs + this.iend_size; // total PNG size
+
+ this.buffer = new Array();
+ this.palette = new Object();
+ this.pindex = 0;
+
+ var _crc32 = new Array();
+
+ // initialize buffer with zero bytes
+ for (var i = 0; i < this.buffer_size; i++) {
+ this.buffer[i] = "\x00";
+ }
+
+ // initialize non-zero elements
+ write(this.buffer, this.ihdr_offs, byte4(this.ihdr_size - 12), 'IHDR', byte4(width), byte4(height), "\x08\x03");
+ write(this.buffer, this.plte_offs, byte4(this.plte_size - 12), 'PLTE');
+ write(this.buffer, this.trns_offs, byte4(this.trns_size - 12), 'tRNS');
+ write(this.buffer, this.idat_offs, byte4(this.idat_size - 12), 'IDAT');
+ write(this.buffer, this.iend_offs, byte4(this.iend_size - 12), 'IEND');
+
+ // initialize deflate header
+ var header = ((8 + (7 << 4)) << 8) | (3 << 6);
+ header+= 31 - (header % 31);
+
+ write(this.buffer, this.idat_offs + 8, byte2(header));
+
+ // initialize deflate block headers
+ for (var i = 0; (i << 16) - 1 < this.pix_size; i++) {
+ var size, bits;
+ if (i + 0xffff < this.pix_size) {
+ size = 0xffff;
+ bits = "\x00";
+ } else {
+ size = this.pix_size - (i << 16) - i;
+ bits = "\x01";
+ }
+ write(this.buffer, this.idat_offs + 8 + 2 + (i << 16) + (i << 2), bits, byte2lsb(size), byte2lsb(~size));
+ }
+
+ /* Create crc32 lookup table */
+ for (var i = 0; i < 256; i++) {
+ var c = i;
+ for (var j = 0; j < 8; j++) {
+ if (c & 1) {
+ c = -306674912 ^ ((c >> 1) & 0x7fffffff);
+ } else {
+ c = (c >> 1) & 0x7fffffff;
+ }
+ }
+ _crc32[i] = c;
+ }
+
+ // compute the index into a png for a given pixel
+ this.index = function(x,y) {
+ var i = y * (this.width + 1) + x + 1;
+ var j = this.idat_offs + 8 + 2 + 5 * Math.floor((i / 0xffff) + 1) + i;
+ return j;
+ };
+
+ // convert a color and build up the palette
+ this.color = function(red, green, blue, alpha) {
+
+ alpha = alpha >= 0 ? alpha : 255;
+ var color = (((((alpha << 8) | red) << 8) | green) << 8) | blue;
+
+ if (typeof this.palette[color] == "undefined") {
+ if (this.pindex == this.depth) return "\x00";
+
+ var ndx = this.plte_offs + 8 + 3 * this.pindex;
+
+ this.buffer[ndx + 0] = String.fromCharCode(red);
+ this.buffer[ndx + 1] = String.fromCharCode(green);
+ this.buffer[ndx + 2] = String.fromCharCode(blue);
+ this.buffer[this.trns_offs+8+this.pindex] = String.fromCharCode(alpha);
+
+ this.palette[color] = String.fromCharCode(this.pindex++);
+ }
+ return this.palette[color];
+ };
+
+ // output a PNG string, Base64 encoded
+ this.getBase64 = function() {
+
+ var s = this.getDump();
+
+ var ch = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+ var c1, c2, c3, e1, e2, e3, e4;
+ var l = s.length;
+ var i = 0;
+ var r = "";
+
+ do {
+ c1 = s.charCodeAt(i);
+ e1 = c1 >> 2;
+ c2 = s.charCodeAt(i+1);
+ e2 = ((c1 & 3) << 4) | (c2 >> 4);
+ c3 = s.charCodeAt(i+2);
+ if (l < i+2) { e3 = 64; } else { e3 = ((c2 & 0xf) << 2) | (c3 >> 6); }
+ if (l < i+3) { e4 = 64; } else { e4 = c3 & 0x3f; }
+ r+= ch.charAt(e1) + ch.charAt(e2) + ch.charAt(e3) + ch.charAt(e4);
+ } while ((i+= 3) < l);
+ return r;
+ };
+
+ // output a PNG string
+ this.getDump = function() {
+
+ // compute adler32 of output pixels + row filter bytes
+ var BASE = 65521; /* largest prime smaller than 65536 */
+ var NMAX = 5552; /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
+ var s1 = 1;
+ var s2 = 0;
+ var n = NMAX;
+
+ for (var y = 0; y < this.height; y++) {
+ for (var x = -1; x < this.width; x++) {
+ s1+= this.buffer[this.index(x, y)].charCodeAt(0);
+ s2+= s1;
+ if ((n-= 1) == 0) {
+ s1%= BASE;
+ s2%= BASE;
+ n = NMAX;
+ }
+ }
+ }
+ s1%= BASE;
+ s2%= BASE;
+ write(this.buffer, this.idat_offs + this.idat_size - 8, byte4((s2 << 16) | s1));
+
+ // compute crc32 of the PNG chunks
+ function crc32(png, offs, size) {
+ var crc = -1;
+ for (var i = 4; i < size-4; i += 1) {
+ crc = _crc32[(crc ^ png[offs+i].charCodeAt(0)) & 0xff] ^ ((crc >> 8) & 0x00ffffff);
+ }
+ write(png, offs+size-4, byte4(crc ^ -1));
+ }
+
+ crc32(this.buffer, this.ihdr_offs, this.ihdr_size);
+ crc32(this.buffer, this.plte_offs, this.plte_size);
+ crc32(this.buffer, this.trns_offs, this.trns_size);
+ crc32(this.buffer, this.idat_offs, this.idat_size);
+ crc32(this.buffer, this.iend_offs, this.iend_size);
+
+ // convert PNG to string
+ return "\x89PNG\r\n\x1A\n"+this.buffer.join('');
+ };
+
+ this.fillRect = function (x, y, w, h, color) {
+ for(var i = 0; i < w; i++) {
+ for (var j = 0; j < h; j++) {
+ this.buffer[this.index(x+i, y+j)] = color;
+ }
+ }
+ };
+ };
+
+// https://stackoverflow.com/questions/2353211/hsl-to-rgb-color-conversion
+ /**
+ * Converts an HSL color value to RGB. Conversion formula
+ * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
+ * Assumes h, s, and l are contained in the set [0, 1] and
+ * returns r, g, and b in the set [0, 255].
+ *
+ * @param {number} h The hue
+ * @param {number} s The saturation
+ * @param {number} l The lightness
+ * @return {Array} The RGB representation
+ */
+
+ function hue2rgb(p, q, t) {
+ if(t < 0) t += 1;
+ if(t > 1) t -= 1;
+ if(t < 1/6) return p + (q - p) * 6 * t;
+ if(t < 1/2) return q;
+ if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
+ return p;
+ }
+
+ function hsl2rgb(h, s, l){
+ var r, g, b;
+
+ if(s == 0){
+ r = g = b = l; // achromatic
+ }else{
+ var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
+ var p = 2 * l - q;
+ r = hue2rgb(p, q, h + 1/3);
+ g = hue2rgb(p, q, h);
+ b = hue2rgb(p, q, h - 1/3);
+ }
+
+ return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255), 255];
+ }
+
+// The random number is a js implementation of the Xorshift PRNG
+ var randseed = new Array(4); // Xorshift: [x, y, z, w] 32 bit values
+
+ function seedrand(seed) {
+ for (var i = 0; i < randseed.length; i++) {
+ randseed[i] = 0;
+ }
+ for (var i = 0; i < seed.length; i++) {
+ randseed[i % 4] = (randseed[i % 4] << 5) - randseed[i % 4] + seed.charCodeAt(i);
+ }
+ }
+
+ function rand() {
+ // based on Java's String.hashCode(), expanded to 4 32bit values
+ var t = randseed[0] ^ (randseed[0] << 11);
+
+ randseed[0] = randseed[1];
+ randseed[1] = randseed[2];
+ randseed[2] = randseed[3];
+ randseed[3] = randseed[3] ^ (randseed[3] >> 19) ^ t ^ (t >> 8);
+
+ return (randseed[3] >>> 0) / (1 << 31 >>> 0);
+ }
+
+ function createColor() {
+ //saturation is the whole color spectrum
+ var h = Math.floor(rand() * 360);
+ //saturation goes from 40 to 100, it avoids greyish colors
+ var s = rand() * 60 + 40;
+ //lightness can be anything from 0 to 100, but probabilities are a bell curve around 50%
+ var l = (rand() + rand() + rand() + rand()) * 25;
+
+ return [h / 360,s / 100,l / 100];
+ }
+
+ function createImageData(size) {
+ var width = size; // Only support square icons for now
+ var height = size;
+
+ var dataWidth = Math.ceil(width / 2);
+ var mirrorWidth = width - dataWidth;
+
+ var data = [];
+ for (var y = 0; y < height; y++) {
+ var row = [];
+ for (var x = 0; x < dataWidth; x++) {
+ // this makes foreground and background color to have a 43% (1/2.3) probability
+ // spot color has 13% chance
+ row[x] = Math.floor(rand() * 2.3);
+ }
+ var r = row.slice(0, mirrorWidth);
+ r.reverse();
+ row = row.concat(r);
+
+ for (var i = 0; i < row.length; i++) {
+ data.push(row[i]);
+ }
+ }
+
+ return data;
+ }
+
+ function buildOpts(opts) {
+ if (!opts.seed) {
+ throw 'No seed provided'
+ }
+
+ seedrand(opts.seed);
+
+ return Object.assign({
+ size: 8,
+ scale: 16,
+ color: createColor(),
+ bgcolor: createColor(),
+ spotcolor: createColor(),
+ }, opts)
+ }
+
+ function toDataUrl(address) {
+ const opts = buildOpts({seed: address.toLowerCase()});
+
+ const imageData = createImageData(opts.size);
+ const width = Math.sqrt(imageData.length);
+
+ const p = new PNG(opts.size*opts.scale, opts.size*opts.scale, 3);
+ const bgcolor = p.color(...hsl2rgb(...opts.bgcolor));
+ const color = p.color(...hsl2rgb(...opts.color));
+ const spotcolor = p.color(...hsl2rgb(...opts.spotcolor));
+
+ for (var i = 0; i < imageData.length; i++) {
+ var row = Math.floor(i / width);
+ var col = i % width;
+ // if data is 0, leave the background
+ if (imageData[i]) {
+ // if data is 2, choose spot color, if 1 choose foreground
+ const pngColor = imageData[i] == 1 ? color : spotcolor;
+ p.fillRect(col * opts.scale, row * opts.scale, opts.scale, opts.scale, pngColor);
+ }
+ }
+ return `data:image/png;base64,${p.getBase64()}`;
+ }
+
+ exports.toDataUrl = toDataUrl;
+
+ Object.defineProperty(exports, '__esModule', { value: true });
+
+})));