1 files changed, 42 insertions, 0 deletions
diff --git a/src/background/run-ocr.ts b/src/background/run-ocr.ts
new file mode 100644
index 0000000..4476f54
--- /dev/null
+++ b/src/background/run-ocr.ts
@@ -0,0 +1,42 @@
+const OFFSCREEN_DOCUMENT_PATH = "offscreen/ocr/index.html";
+
+// Function to ensure the offscreen document is open
+async function setupOffscreenDocument() {
+	if (await chrome.offscreen.hasDocument()) {
+		return; // Offscreen document already open
+	}
+	await chrome.offscreen.createDocument({
+		url: OFFSCREEN_DOCUMENT_PATH,
+		reasons: [chrome.offscreen.Reason.CLIPBOARD],
+		justification: "Performing OCR with Tesseract.js in a long-running context."
+	});
+}
+
+// Listen for messages from content scripts (and popup if applicable)
+chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
+	if (message.type === "OCR" && message.dataURL) {
+		(async () => {
+			try {
+				// Ensure the offscreen document is open
+				await setupOffscreenDocument();
+
+				// Send the OCR request to the offscreen document
+				const offscreenResponse = await chrome.runtime.sendMessage({
+					type: "OFFSCREEN_OCR_REQUEST",
+					dataURL: message.dataURL
+				});
+
+				if (offscreenResponse && offscreenResponse.success) {
+					sendResponse({ success: true, text: offscreenResponse.text });
+				} else {
+					sendResponse({ success: false, error: offscreenResponse?.error || "Unknown OCR error" });
+				}
+			} catch (error) {
+				sendResponse({ success: false, error: (error as Error).message });
+			}
+		})();
+		return true; // Indicate async response
+	}
+
+	return false;
+});