Squash Odysseus development history

static/js/editor/serialization-worker.js

@@ -0,0 +1,21 @@
+/* Encode a batch of canvas bitmaps without blocking the editor thread. */
+self.onmessage = async event => {
+  const bitmaps = Array.isArray(event.data?.bitmaps) ? event.data.bitmaps : [];
+  try {
+    const blobs = [];
+    for (const bitmap of bitmaps) {
+      if (!bitmap?.width || !bitmap?.height) {
+        blobs.push(null);
+        continue;
+      }
+      const canvas = new OffscreenCanvas(bitmap.width, bitmap.height);
+      canvas.getContext('2d').drawImage(bitmap, 0, 0);
+      blobs.push(await canvas.convertToBlob({ type: 'image/png' }));
+      bitmap.close?.();
+    }
+    self.postMessage({ blobs });
+  } catch (error) {
+    for (const bitmap of bitmaps) bitmap?.close?.();
+    self.postMessage({ error: String(error?.message || error) });
+  }
+};