1 files changed, 34 insertions, 0 deletions
diff --git a/src/view/lib/asset-gen.ts b/src/view/lib/asset-gen.ts
new file mode 100644
index 000000000..6dbce2510
--- /dev/null
+++ b/src/view/lib/asset-gen.ts
@@ -0,0 +1,34 @@
+import {colors} from './styles'
+
+const GRADIENTS = [
+  [colors.pink3, colors.purple3],
+  [colors.purple3, colors.blue3],
+  [colors.blue3, colors.green3],
+  [colors.red3, colors.pink3],
+]
+
+export function getGradient(handle: string): string[] {
+  const gi = cyrb53(handle) % GRADIENTS.length
+  return GRADIENTS[gi]
+}
+
+// deterministic string->hash
+// https://stackoverflow.com/a/52171480
+function cyrb53(str: string, seed = 0): number {
+  let h1 = 0xdeadbeef ^ seed,
+    h2 = 0x41c6ce57 ^ seed
+  for (let i = 0, ch; i < str.length; i++) {
+    ch = str.charCodeAt(i)
+    h1 = Math.imul(h1 ^ ch, 2654435761)
+    h2 = Math.imul(h2 ^ ch, 1597334677)
+  }
+
+  h1 =
+    Math.imul(h1 ^ (h1 >>> 16), 2246822507) ^
+    Math.imul(h2 ^ (h2 >>> 13), 3266489909)
+  h2 =
+    Math.imul(h2 ^ (h2 >>> 16), 2246822507) ^
+    Math.imul(h1 ^ (h1 >>> 13), 3266489909)
+
+  return 4294967296 * (2097151 & h2) + (h1 >>> 0)
+}