Add seeding to marketplace

dev/marketplace-scripts/rotating-logo/metadata.json

@@ -0,0 +1,4 @@
+{
+  "name": "Rotating logo",
+  "description": "Renders the Imgfloat logo and rotates it every tick."
+}

dev/marketplace-scripts/rotating-logo/source.js

@@ -0,0 +1,33 @@
+async function init(context, state) {
+    const asset = Array.isArray(context.assets) ? context.assets[0] : null;
+    if (!asset?.blob) {
+        return;
+    }
+    state.rotation = 0;
+    state.imageReady = false;
+    try {
+        state.image = await createImageBitmap(asset.blob);
+        state.imageReady = true;
+    } catch (error) {
+        state.imageError = error;
+    }
+}
+
+function tick(context, state) {
+    const { ctx, width, height, deltaMs } = context;
+    if (!ctx) {
+        return;
+    }
+    ctx.clearRect(0, 0, width, height);
+    const image = state?.image;
+    if (!image || !state.imageReady) {
+        return;
+    }
+    const size = Math.min(width, height) * 0.35;
+    state.rotation = (state.rotation + (deltaMs || 0) * 0.002) % (Math.PI * 2);
+    ctx.save();
+    ctx.translate(width / 2, height / 2);
+    ctx.rotate(state.rotation);
+    ctx.drawImage(image, -size / 2, -size / 2, size, size);
+    ctx.restore();
+}