scans and ref image

packages/core/src/lib/asset-storage.ts

@@ -0,0 +1,55 @@
+import { get, set } from 'idb-keyval'
+
+export const ASSET_PREFIX = 'asset_data:'
+
+// Cache for active object URLs to prevent leaks and flickering
+const urlCache = new Map<string, string>()
+
+/**
+ * Save a file to IndexedDB and return a custom protocol URL
+ */
+export async function saveAsset(file: File): Promise<string> {
+  const id = crypto.randomUUID()
+  await set(`${ASSET_PREFIX}${id}`, file)
+  return `asset://${id}`
+}
+
+/**
+ * Load a file from IndexedDB and return an object URL
+ * If the URL is not a custom protocol URL, return it as is
+ */
+export async function loadAssetUrl(url: string): Promise<string | null> {
+  if (!url) return null
+
+  // If it's already a blob or http URL, return as is
+  if (url.startsWith('blob:') || url.startsWith('http')) {
+    return url
+  }
+
+  // Handle our custom asset protocol
+  if (url.startsWith('asset://')) {
+    const id = url.replace('asset://', '')
+
+    // Check cache first
+    if (urlCache.has(id)) {
+      return urlCache.get(id)!
+    }
+
+    try {
+      const file = await get<File | Blob>(`${ASSET_PREFIX}${id}`)
+      if (!file) {
+        console.warn(`Asset not found: ${id}`)
+        return null
+      }
+      const objectUrl = URL.createObjectURL(file)
+      urlCache.set(id, objectUrl)
+      return objectUrl
+    } catch (error) {
+      console.error('Failed to load asset:', error)
+      return null
+    }
+  }
+
+  // Legacy data URLs are returned as is
+  return url
+}