kml first commit

src/colors.ts

@@ -0,0 +1,34 @@
+// Stable video_name -> RGB hash (12-color palette).
+
+const PALETTE: ReadonlyArray<readonly [number, number, number]> = [
+  [231, 76, 60],
+  [52, 152, 219],
+  [46, 204, 113],
+  [241, 196, 15],
+  [155, 89, 182],
+  [230, 126, 34],
+  [26, 188, 156],
+  [233, 30, 99],
+  [3, 169, 244],
+  [205, 220, 57],
+  [255, 87, 34],
+  [121, 85, 72],
+];
+
+const cache = new Map<string, readonly [number, number, number]>();
+
+export function videoColorRGB(
+  name: string | null | undefined,
+): readonly [number, number, number] {
+  const key = name ?? "";
+  const hit = cache.get(key);
+  if (hit) return hit;
+  let h = 0;
+  for (let i = 0; i < key.length; i++) {
+    h = ((h << 5) - h + key.charCodeAt(i)) | 0;
+  }
+  const idx = ((h % PALETTE.length) + PALETTE.length) % PALETTE.length;
+  const c = PALETTE[idx];
+  cache.set(key, c);
+  return c;
+}