From d7d344f3e733368fcf1d246877dced25094bef8c Mon Sep 17 00:00:00 2001
From: Alexis Sellier <self@cloudhead.io>
Date: Fri, 28 May 2021 20:34:04 +0200
Subject: [PATCH] Improve blockies

---
 src/{Blocky.svelte => Blockies.svelte} |  11 +--
 src/base/orgs/View.svelte              |   4 +-
 src/blockies.ts                        | 125 +++++++++++++++++++++++++
 3 files changed, 132 insertions(+), 8 deletions(-)
 rename src/{Blocky.svelte => Blockies.svelte} (69%)
 create mode 100644 src/blockies.ts

diff --git a/src/Blocky.svelte b/src/Blockies.svelte
similarity index 69%
rename from src/Blocky.svelte
rename to src/Blockies.svelte
index a0e7e6771..c086b763a 100644
--- a/src/Blocky.svelte
+++ b/src/Blockies.svelte
@@ -1,17 +1,17 @@
 <script lang="typescript">
   import { onMount } from 'svelte';
-  import blockies from 'ethereum-blockies';
+  import { createIcon } from '@app/blockies';
 
   export let address: string;
 
   let container: HTMLElement;
 
   onMount(() => {
-    const seed = address;
-    const avatar = blockies.create({
+    const seed = address.toLowerCase();
+    const avatar = createIcon({
       seed,
       size: 8,
-      scale: 16
+      scale: 16,
     });
     container.style.backgroundImage = `url(${avatar.toDataURL()})`;
   });
@@ -27,5 +27,4 @@
   }
 </style>
 
-<div class="icon" bind:this={container}>
-</div>
+<div class="icon" bind:this={container}></div>
diff --git a/src/base/orgs/View.svelte b/src/base/orgs/View.svelte
index 6fb30c0b8..adeb2fb93 100644
--- a/src/base/orgs/View.svelte
+++ b/src/base/orgs/View.svelte
@@ -12,7 +12,7 @@
   import Modal from '@app/Modal.svelte';
   import Error from '@app/Error.svelte';
   import Icon from '@app/Icon.svelte';
-  import Blocky from '@app/Blocky.svelte';
+  import Blockies from '@app/Blockies.svelte';
   import SetName from '@app/ens/SetName.svelte';
   import Project from '@app/base/projects/Widget.svelte';
   import * as utils from '@app/utils';
@@ -110,7 +110,7 @@
           {#if registration && registration.avatar}
             <img src={registration.avatar} alt="avatar" />
           {:else}
-            <Blocky address={org.address} />
+            <Blockies address={org.address} />
           {/if}
         </div>
         <div class="info">
diff --git a/src/blockies.ts b/src/blockies.ts
new file mode 100644
index 000000000..a1039397e
--- /dev/null
+++ b/src/blockies.ts
@@ -0,0 +1,125 @@
+// Copyright (c) 2019, Ethereum Name Service
+
+// The random number is a js implementation of the Xorshift PRNG
+let randseed = new Array(4) // Xorshift: [x, y, z, w] 32 bit values
+
+function seedrand(seed: string) {
+  for (let i = 0; i < randseed.length; i++) {
+    randseed[i] = 0;
+  }
+  for (let i = 0; i < seed.length; i++) {
+    randseed[i % 4] =
+      (randseed[i % 4] << 5) - randseed[i % 4] + seed.charCodeAt(i);
+  }
+}
+
+function rand(): number {
+  // Based on Java's String.hashCode(), expanded to 4 32bit values.
+  let 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(): string {
+  // Saturation is the whole color spectrum.
+  let h = Math.floor(rand() * 360);
+  // Saturation goes from 40 to 100, it avoids greyish colors.
+  let s = rand() * 60 + 40 + '%';
+  // Lightness can be anything from 0 to 100, but probabilities are a bell curve around 50%.
+  let l = (rand() + rand() + rand() + rand()) * 25 + '%';
+
+  return `hsl(${h}, ${s}, ${l})`;
+}
+
+function createImageData(size: number): number[] {
+  let width = size;
+  let height = size;
+
+  let dataWidth = Math.ceil(width / 2);
+  let mirrorWidth = width - dataWidth;
+
+  let data = [];
+  for (let y = 0; y < height; y++) {
+    let row = [];
+    for (let 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);
+    }
+    let r = row.slice(0, mirrorWidth);
+    r.reverse();
+    row = row.concat(r);
+
+    for (let i = 0; i < row.length; i++) {
+      data.push(row[i]);
+    }
+  }
+
+  return data;
+}
+
+function createCanvas(
+  imageData: number[],
+  color: string,
+  scale: number,
+  bgcolor: string,
+  spotcolor: string
+): HTMLCanvasElement {
+  let c = document.createElement('canvas');
+  let width = Math.sqrt(imageData.length);
+  c.width = c.height = width * scale;
+
+  let cc = c.getContext('2d');
+
+  if (! cc) throw new Error("Can't get 2D context");
+
+  cc.fillStyle = bgcolor;
+  cc.fillRect(0, 0, c.width, c.height);
+  cc.fillStyle = color;
+
+  for (let i = 0; i < imageData.length; i++) {
+    let row = Math.floor(i / width);
+    let col = i % width;
+    // if data is 2, choose spot color, if 1 choose foreground
+    cc.fillStyle = imageData[i] === 1 ? color : spotcolor;
+
+    // if data is 0, leave the background
+    if (imageData[i]) {
+      cc.fillRect(col * scale, row * scale, scale, scale);
+    }
+  }
+
+  return c;
+}
+
+export interface Options {
+  seed: string
+  size: number
+  scale: number
+  color?: string
+  bgcolor?: string
+  spotcolor?: string
+}
+
+export function createIcon(opts: Options) {
+  opts = opts || {};
+  let size = opts.size || 8;
+  let scale = opts.scale || 4;
+  let seed =
+    opts.seed || Math.floor(Math.random() * Math.pow(10, 16)).toString(16);
+
+  seedrand(seed);
+
+  let color = opts.color || createColor();
+  let bgcolor = opts.bgcolor || createColor();
+  let spotcolor = opts.spotcolor || createColor();
+  let imageData = createImageData(size);
+  let canvas = createCanvas(imageData, color, scale, bgcolor, spotcolor);
+
+  return canvas;
+}