Adjust guide video annotation timing

build/installer.nsh

@@ -0,0 +1,17 @@
+!macro customInstall
+  DetailPrint "Installing OpenScreen OCR Windows service"
+  nsExec::ExecToLog '"$SYSDIR\sc.exe" stop OpenScreenOCR'
+  nsExec::ExecToLog '"$SYSDIR\sc.exe" delete OpenScreenOCR'
+  Sleep 1000
+  ExpandEnvStrings $0 "%ProgramData%\OpenScreen\ocr-runtime"
+  CreateDirectory "$0"
+  nsExec::ExecToLog '"$SYSDIR\sc.exe" create OpenScreenOCR binPath= "\"$INSTDIR\resources\electron\native\bin\win32-x64\openscreen-ocr-service-wrapper.exe\" --service --exe \"$INSTDIR\resources\ocr-service\openscreen-ocr-service.exe\" --resources \"$INSTDIR\resources\" --data \"$0\"" start= auto DisplayName= "OpenScreen OCR Service"'
+  nsExec::ExecToLog '"$SYSDIR\sc.exe" description OpenScreenOCR "Local OCR service used by OpenScreen guide capture."'
+  nsExec::ExecToLog '"$SYSDIR\sc.exe" start OpenScreenOCR'
+!macroend
+
+!macro customUnInstall
+  DetailPrint "Removing OpenScreen OCR Windows service"
+  nsExec::ExecToLog '"$SYSDIR\sc.exe" stop OpenScreenOCR'
+  nsExec::ExecToLog '"$SYSDIR\sc.exe" delete OpenScreenOCR'
+!macroend

docs/engineering/paddleocr-local-service.md

@@ -6,7 +6,7 @@ OpenScreen calls OCR through a local HTTP service. The default endpoint is:
 http://127.0.0.1:8866/ocr
 ```
 
-The app sends either `imageBase64` or `path` and expects OCR blocks:
+The app sends either `imageBase64` or `path`, plus optional `language` and `profile`, and expects OCR blocks:
 
 ```json
 {
@@ -38,7 +38,7 @@ If `paddle` is still missing after installing `paddleocr`, install the CPU Paddl
 ```powershell
 .\.venv-ocr\Scripts\Activate.ps1
 $env:PADDLEOCR_DEVICE="cpu"
-$env:PADDLEOCR_LANG="latin"
+$env:OPENSCREEN_OCR_PROFILE="vietnamese"
 npm run ocr:paddle
 ```
 
@@ -58,7 +58,8 @@ Expected healthy environment:
   "paddleocrInstalled": true,
   "paddleInstalled": true,
   "engineReady": false,
-  "defaultLanguage": "latin"
+  "defaultLanguage": "vi,en",
+  "defaultProfile": "vietnamese"
 }
 ```
 
@@ -67,7 +68,10 @@ Expected healthy environment:
 ## Configuration
 
 - `PADDLEOCR_DEVICE`: `cpu`, `gpu:0`, or another PaddleOCR device string.
-- `PADDLEOCR_LANG`: defaults to `latin`; this is preferred for Vietnamese UI text because it uses a Latin-script recognition model.
+- `OPENSCREEN_OCR_PROFILE`: `fast`, `vietnamese`, or `hybrid`. The default `vietnamese` profile upscales and sharpens focused UI screenshots before OCR.
+- `OPENSCREEN_GUIDE_OCR_LANGUAGE`: defaults to `vi,en`.
+- `PADDLEOCR_LANG`: optional hard override. Leave unset for the app profile/language settings to work.
 - `PADDLEOCR_VERSION`: defaults to `PP-OCRv5`.
 - `PADDLEOCR_USE_MOBILE`: defaults to `1`; set to `0` to use the default/server models.
+- `PADDLEOCR_REC_MODEL`: optional recognizer model override. The bundled profile uses `latin_PP-OCRv5_mobile_rec`, which supports Vietnamese Latin-script text.
 - `OPENSCREEN_GUIDE_OCR_URL`: OpenScreen OCR endpoint override; defaults to `http://127.0.0.1:8866`.

electron-builder.json5

@@ -13,11 +13,17 @@
   },
   "npmRebuild": true,
   "buildDependenciesFromSource": true,
-  "compression": "normal",
+  "compression": "normal",
-  "directories": {
+  "directories": {
-    "output": "release/${version}"
+    "output": "release/${version}"
-  },
+  },
-  "files": [
+  "publish": [
+    {
+      "provider": "generic",
+      "url": "https://gittea.softs.business/huanld/openscreen/raw/branch/release-assets%2Flatest"
+    }
+  ],
+  "files": [
     "dist",
     "dist-electron",
     "!*.png",
@@ -79,6 +85,7 @@
       "nsis"
     ],
     "icon": "icons/icons/win/icon.ico",
+    "requestedExecutionLevel": "requireAdministrator",
     "signAndEditExecutable": false,
     "signExts": ["!.exe"],
     "extraResources": [
@@ -99,8 +106,10 @@
       }
     ]
   },
-  "nsis": {
+  "nsis": {
-    "oneClick": false,
+    "oneClick": false,
-    "allowToChangeInstallationDirectory": true
+    "allowToChangeInstallationDirectory": true,
-  }
+    "perMachine": true,
-}
+    "include": "build/installer.nsh"
+  }
+}

electron/electron-env.d.ts

@@ -24,6 +24,14 @@ declare namespace NodeJS {
 // Used in Renderer process, expose in `preload.ts`
 interface Window {
 	electronAPI: {
+		updates: {
+			getStatus: () => Promise<import("../src/lib/updateStatus").UpdateStatus>;
+			check: () => Promise<import("../src/lib/updateStatus").UpdateCheckResult>;
+			install: () => Promise<import("../src/lib/updateStatus").UpdateCheckResult>;
+			onStatus: (
+				callback: (status: import("../src/lib/updateStatus").UpdateStatus) => void,
+			) => () => void;
+		};
 		invokeNativeBridge: <TData = unknown>(
 			request: import("../src/native/contracts").NativeBridgeRequest,
 		) => Promise<import("../src/native/contracts").NativeBridgeResponse<TData>>;

electron/guide/ai/deepseekSettingsStore.test.ts

@@ -0,0 +1,66 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { DeepSeekSettingsStore } from "./deepseekSettingsStore";
+
+const tempDirs: string[] = [];
+const originalOcrProfile = process.env.OPENSCREEN_GUIDE_OCR_PROFILE;
+const originalOcrLanguage = process.env.OPENSCREEN_GUIDE_OCR_LANGUAGE;
+
+beforeEach(() => {
+	delete process.env.OPENSCREEN_GUIDE_OCR_PROFILE;
+	delete process.env.OPENSCREEN_GUIDE_OCR_LANGUAGE;
+});
+
+afterEach(async () => {
+	restoreEnv("OPENSCREEN_GUIDE_OCR_PROFILE", originalOcrProfile);
+	restoreEnv("OPENSCREEN_GUIDE_OCR_LANGUAGE", originalOcrLanguage);
+	await Promise.all(tempDirs.splice(0).map((dir) => fs.rm(dir, { recursive: true, force: true })));
+});
+
+function restoreEnv(name: string, value: string | undefined): void {
+	if (value === undefined) {
+		delete process.env[name];
+		return;
+	}
+	process.env[name] = value;
+}
+
+async function createStore(): Promise<DeepSeekSettingsStore> {
+	const dir = await fs.mkdtemp(path.join(os.tmpdir(), "openscreen-guide-settings-"));
+	tempDirs.push(dir);
+	return new DeepSeekSettingsStore(path.join(dir, "guide-ai-settings.json"));
+}
+
+describe("DeepSeekSettingsStore OCR settings", () => {
+	it("defaults to the Vietnamese enhanced OCR profile", async () => {
+		const store = await createStore();
+
+		await expect(store.getOcrConfig()).resolves.toEqual({
+			profile: "vietnamese",
+			language: "vi,en",
+		});
+	});
+
+	it("persists OCR profile changes alongside DeepSeek settings", async () => {
+		const store = await createStore();
+
+		const status = await store.save({
+			deepseekApiKeyEnvName: "DEEPSEEK_API_KEY",
+			baseUrl: "https://api.deepseek.com",
+			model: "deepseek-chat",
+			ocrProfile: "hybrid",
+			ocrLanguage: "vi,en",
+		});
+
+		expect(status.ocr).toMatchObject({
+			profile: "hybrid",
+			language: "vi,en",
+		});
+		await expect(store.getOcrConfig()).resolves.toEqual({
+			profile: "hybrid",
+			language: "vi,en",
+		});
+	});
+});

electron/guide/ai/deepseekSettingsStore.ts

@@ -1,6 +1,10 @@
 import fs from "node:fs/promises";
 import path from "node:path";
-import type { GuideAiSettings, SaveGuideAiSettingsInput } from "../../../src/guide/contracts";
+import type {
+	GuideAiSettings,
+	GuideOcrProfile,
+	SaveGuideAiSettingsInput,
+} from "../../../src/guide/contracts";
 
 export interface DeepSeekGuideConfig {
 	apiKey?: string;
@@ -12,8 +16,22 @@ export interface DeepSeekGuideConfigProvider {
 	getDeepSeekConfig(): Promise<DeepSeekGuideConfig>;
 }
 
+export interface GuideOcrConfig {
+	profile: GuideOcrProfile;
+	language: string;
+}
+
+export interface GuideOcrConfigProvider {
+	getOcrConfig(): Promise<GuideOcrConfig>;
+}
+
 interface PersistedGuideAiSettings {
 	schemaVersion: 1;
+	ocr?: {
+		profile?: GuideOcrProfile;
+		language?: string;
+		updatedAt?: string;
+	};
 	deepseek?: {
 		apiKeyEnvName?: string;
 		baseUrl?: string;
@@ -25,8 +43,10 @@ interface PersistedGuideAiSettings {
 const DEFAULT_DEEPSEEK_API_KEY_ENV_NAME = "DEEPSEEK_API_KEY";
 const DEFAULT_DEEPSEEK_BASE_URL = "https://api.deepseek.com";
 const DEFAULT_DEEPSEEK_MODEL = "deepseek-chat";
+const DEFAULT_OCR_PROFILE: GuideOcrProfile = "vietnamese";
+const DEFAULT_OCR_LANGUAGE = "vi,en";
 
-export class DeepSeekSettingsStore implements DeepSeekGuideConfigProvider {
+export class DeepSeekSettingsStore implements DeepSeekGuideConfigProvider, GuideOcrConfigProvider {
 	constructor(private readonly filePath: string) {}
 
 	async getStatus(): Promise<GuideAiSettings> {
@@ -35,6 +55,13 @@ export class DeepSeekSettingsStore implements DeepSeekGuideConfigProvider {
 		const activeApiKey = process.env[apiKeyEnvName];
 
 		return {
+			ocr: {
+				profile: normalizeOcrProfile(raw?.ocr?.profile ?? process.env.OPENSCREEN_GUIDE_OCR_PROFILE),
+				language: normalizeOcrLanguage(
+					raw?.ocr?.language ?? process.env.OPENSCREEN_GUIDE_OCR_LANGUAGE,
+				),
+				updatedAt: raw?.ocr?.updatedAt,
+			},
 			deepseek: {
 				hasApiKey: Boolean(activeApiKey),
 				apiKeyEnvName,
@@ -49,7 +76,14 @@ export class DeepSeekSettingsStore implements DeepSeekGuideConfigProvider {
 
 	async save(input: SaveGuideAiSettingsInput): Promise<GuideAiSettings> {
 		const current = (await this.readSettings()) ?? { schemaVersion: 1 };
+		const currentOcr = current.ocr ?? {};
 		const currentDeepSeek = current.deepseek ?? {};
+		const nextOcr = {
+			...currentOcr,
+			profile: normalizeOcrProfile(input.ocrProfile ?? currentOcr.profile),
+			language: normalizeOcrLanguage(input.ocrLanguage ?? currentOcr.language),
+			updatedAt: new Date().toISOString(),
+		};
 		const nextDeepSeek = {
 			...currentDeepSeek,
 			baseUrl: normalizeBaseUrl(input.baseUrl ?? currentDeepSeek.baseUrl),
@@ -65,6 +99,7 @@ export class DeepSeekSettingsStore implements DeepSeekGuideConfigProvider {
 
 		await this.writeSettings({
 			schemaVersion: 1,
+			ocr: nextOcr,
 			deepseek: nextDeepSeek,
 		});
 		return await this.getStatus();
@@ -80,6 +115,16 @@ export class DeepSeekSettingsStore implements DeepSeekGuideConfigProvider {
 		};
 	}
 
+	async getOcrConfig(): Promise<GuideOcrConfig> {
+		const raw = await this.readSettings();
+		return {
+			profile: normalizeOcrProfile(raw?.ocr?.profile ?? process.env.OPENSCREEN_GUIDE_OCR_PROFILE),
+			language: normalizeOcrLanguage(
+				raw?.ocr?.language ?? process.env.OPENSCREEN_GUIDE_OCR_LANGUAGE,
+			),
+		};
+	}
+
 	private async readSettings(): Promise<PersistedGuideAiSettings | null> {
 		try {
 			const content = await fs.readFile(this.filePath, "utf-8");
@@ -120,6 +165,11 @@ function normalizePersistedSettings(input: unknown): PersistedGuideAiSettings |
 	}
 	return {
 		schemaVersion: 1,
+		ocr: {
+			profile: normalizeOcrProfile(raw.ocr?.profile),
+			language: normalizeOcrLanguage(raw.ocr?.language),
+			updatedAt: raw.ocr?.updatedAt,
+		},
 		deepseek: {
 			apiKeyEnvName: normalizeEnvName(raw.deepseek?.apiKeyEnvName),
 			baseUrl: raw.deepseek?.baseUrl,
@@ -155,3 +205,19 @@ function normalizeBaseUrl(value: string | undefined): string {
 function normalizeModel(value: string | undefined): string {
 	return value?.trim() || DEFAULT_DEEPSEEK_MODEL;
 }
+
+function normalizeOcrProfile(value: string | undefined): GuideOcrProfile {
+	if (value === "fast" || value === "vietnamese" || value === "hybrid") {
+		return value;
+	}
+	return DEFAULT_OCR_PROFILE;
+}
+
+function normalizeOcrLanguage(value: string | undefined): string {
+	const normalized = value
+		?.split(",")
+		.map((part) => part.trim().toLowerCase())
+		.filter(Boolean)
+		.join(",");
+	return normalized || DEFAULT_OCR_LANGUAGE;
+}

electron/guide/guideStore.test.ts

@@ -168,6 +168,7 @@ describe("GuideStore", () => {
 			width: 800,
 			height: 600,
 			pngBytes: new Uint8Array([137, 80, 78, 71]).buffer,
+			markedPngBytes: new Uint8Array([137, 80, 78, 71, 1]).buffer,
 		});
 
 		expect(session.status).toBe("snapshots-ready");
@@ -176,6 +177,9 @@ describe("GuideStore", () => {
 		await expect(fs.readFile(session.snapshots[0]?.path ?? "")).resolves.toEqual(
 			Buffer.from([137, 80, 78, 71]),
 		);
+		await expect(fs.readFile(session.snapshots[0]?.markedPath ?? "")).resolves.toEqual(
+			Buffer.from([137, 80, 78, 71, 1]),
+		);
 	});
 
 	it("runs OCR, generates a local draft, and exports files", async () => {
@@ -228,6 +232,74 @@ describe("GuideStore", () => {
 		await expect(fs.readFile(html.path, "utf-8")).resolves.toContain("<!doctype html>");
 	});
 
+	it("resumes OCR without reprocessing completed snapshots", async () => {
+		const recognizedSnapshotIds: string[] = [];
+		const store = new GuideStore(recordingsDir, {
+			ocrClient: {
+				recognize: async (snapshot) => {
+					recognizedSnapshotIds.push(snapshot.id);
+					return [];
+				},
+			},
+		});
+		await store.startSession(115);
+		const firstMarker = await store.addMarker({
+			recordingId: 115,
+			kind: "hotkey",
+			timeMs: 100,
+			label: "Ctrl+F12 marker",
+			normalizedX: 0.25,
+			normalizedY: 0.35,
+		});
+		const secondMarker = await store.addMarker({
+			recordingId: 115,
+			kind: "hotkey",
+			timeMs: 300,
+			label: "Ctrl+F12 marker",
+			normalizedX: 0.6,
+			normalizedY: 0.7,
+		});
+		const firstEvent = firstMarker.event;
+		const secondEvent = secondMarker.event;
+		await store.writeSnapshot({
+			recordingId: 115,
+			eventId: firstEvent?.id ?? "",
+			timeMs: 100,
+			offsetMs: 0,
+			width: 800,
+			height: 600,
+			pngBytes: new Uint8Array([1, 2, 3]).buffer,
+		});
+		await store.writeSnapshot({
+			recordingId: 115,
+			eventId: secondEvent?.id ?? "",
+			timeMs: 300,
+			offsetMs: 0,
+			width: 800,
+			height: 600,
+			pngBytes: new Uint8Array([4, 5, 6]).buffer,
+		});
+
+		await store.runOcr({
+			recordingId: 115,
+			snapshotIds: [`snapshot-${firstEvent?.id}`],
+		});
+		expect(recognizedSnapshotIds).toEqual([`snapshot-${firstEvent?.id}`]);
+
+		const resumedSession = await store.runOcr({ recordingId: 115 });
+		expect(recognizedSnapshotIds).toEqual([
+			`snapshot-${firstEvent?.id}`,
+			`snapshot-${secondEvent?.id}`,
+		]);
+		expect(resumedSession.snapshots.every((snapshot) => snapshot.ocrCompletedAt)).toBe(true);
+
+		await store.runOcr({ recordingId: 115 });
+		expect(recognizedSnapshotIds).toEqual([
+			`snapshot-${firstEvent?.id}`,
+			`snapshot-${secondEvent?.id}`,
+		]);
+	});
+
 	it("repairs generic hotkey marker text and attaches AI draft artifacts", async () => {
 		const store = new GuideStore(recordingsDir, {
 			ocrClient: {

electron/guide/guideStore.ts

@@ -34,7 +34,10 @@ import {
 	DeepSeekGuideClientError,
 	type GuideDraftClient,
 } from "./ai/deepseekGuideClient";
-import type { DeepSeekGuideConfigProvider } from "./ai/deepseekSettingsStore";
+import type {
+	DeepSeekGuideConfigProvider,
+	GuideOcrConfigProvider,
+} from "./ai/deepseekSettingsStore";
 import { type GuidePaths, normalizeGuideRecordingId, resolveGuidePaths } from "./guidePaths";
 import { createFocusedOcrSnapshot, remapFocusedOcrBlocks } from "./ocr/focusedOcrSnapshot";
 import { DefaultGuideOcrClient, type GuideOcrClient } from "./ocr/paddleOcrClient";
@@ -55,6 +58,8 @@ const VALID_EVENT_SOURCES = new Set<GuideEventSource>([
 	"review-ui",
 ]);
 
+const guideOcrJobsByRecordingId = new Map<string, Promise<GuideSession>>();
+
 export class GuideStoreError extends Error {
 	constructor(
 		readonly code: GuideErrorCode,
@@ -70,6 +75,7 @@ export interface GuideStoreDependencies {
 	ocrClient?: GuideOcrClient;
 	draftClient?: GuideDraftClient;
 	deepSeekConfigProvider?: DeepSeekGuideConfigProvider;
+	ocrConfigProvider?: GuideOcrConfigProvider;
 	focusOcrSnapshots?: boolean;
 }
 
@@ -209,10 +215,19 @@ export class GuideStore {
 
 		this.assertGuidePathIsAllowed(session.outputDir);
 		await fs.mkdir(session.outputDir, { recursive: true });
-		const fileName = `step-${String(eventIndex + 1).padStart(3, "0")}.png`;
+		const fileBaseName = `step-${String(eventIndex + 1).padStart(3, "0")}`;
+		const fileName = `${fileBaseName}.png`;
 		const snapshotPath = path.join(session.outputDir, fileName);
+		const markedSnapshotPath = path.join(session.outputDir, `${fileBaseName}-marked.png`);
 		this.assertGuidePathIsAllowed(snapshotPath);
+		this.assertGuidePathIsAllowed(markedSnapshotPath);
 		await fs.writeFile(snapshotPath, Buffer.from(new Uint8Array(input.pngBytes)));
+		const hasMarkedSnapshot = Boolean(input.markedPngBytes?.byteLength);
+		if (hasMarkedSnapshot && input.markedPngBytes) {
+			await fs.writeFile(markedSnapshotPath, Buffer.from(new Uint8Array(input.markedPngBytes)));
+		} else {
+			await fs.unlink(markedSnapshotPath).catch(() => undefined);
+		}
 
 		const snapshot: GuideSnapshot = {
 			id: `snapshot-${input.eventId}`,
@@ -220,6 +235,7 @@ export class GuideStore {
 			timeMs: Math.max(0, input.timeMs),
 			offsetMs: input.offsetMs,
 			path: snapshotPath,
+			markedPath: hasMarkedSnapshot ? markedSnapshotPath : undefined,
 			width: Math.round(input.width),
 			height: Math.round(input.height),
 		};
@@ -245,48 +261,103 @@ export class GuideStore {
 	}
 
 	async runOcr(input: RunGuideOcrInput): Promise<GuideSession> {
-		const session = await this.readSession(input.recordingId);
+		const recordingId = normalizeGuideRecordingId(input.recordingId);
-		const requestedIds = new Set(input.snapshotIds ?? []);
+		if (!recordingId) {
-		const snapshots =
+			throw new GuideStoreError("guide-invalid-input", "OCR run is missing recordingId.");
-			requestedIds.size > 0
-				? session.snapshots.filter((snapshot) => requestedIds.has(snapshot.id))
-				: session.snapshots;
-		if (snapshots.length === 0) {
-			throw new GuideStoreError("guide-invalid-input", "No guide snapshots are available for OCR.");
 		}
 
-		const ocrClient = this.dependencies.ocrClient ?? new DefaultGuideOcrClient();
+		const previousJob =
-		const shouldFocusOcrSnapshots =
+			guideOcrJobsByRecordingId.get(recordingId)?.catch(() => undefined) ?? Promise.resolve();
-			this.dependencies.focusOcrSnapshots ?? this.dependencies.ocrClient === undefined;
+		const nextJob = previousJob.then(async () => {
-		const eventsById = new Map(session.events.map((event) => [event.id, event]));
+			let session = await this.readSession(recordingId);
-		const blocks: OcrBlock[] = [];
+			const requestedIds = new Set(input.snapshotIds ?? []);
-		try {
+			const snapshots =
-			for (const snapshot of snapshots) {
+				requestedIds.size > 0
-				const focusedSnapshot = shouldFocusOcrSnapshots
+					? session.snapshots.filter((snapshot) => requestedIds.has(snapshot.id))
-					? await createFocusedOcrSnapshot({
+					: session.snapshots;
-							snapshot,
+			if (snapshots.length === 0) {
-							event: eventsById.get(snapshot.eventId),
+				throw new GuideStoreError(
-							outputDir: session.outputDir,
+					"guide-invalid-input",
-						})
+					"No guide snapshots are available for OCR.",
-					: { snapshot };
+				);
-				const recognizedBlocks = await ocrClient.recognize(focusedSnapshot.snapshot);
-				blocks.push(...remapFocusedOcrBlocks(recognizedBlocks, focusedSnapshot.transform));
 			}
-		} catch (error) {
-			throw new GuideStoreError(
-				"guide-ocr-unavailable",
-				error instanceof Error ? error.message : "OCR failed.",
-				true,
-			);
-		}
 
-		const snapshotIds = new Set(snapshots.map((snapshot) => snapshot.id));
+			const completedSnapshotIds = new Set(
+				session.snapshots
+					.filter((snapshot) => isSnapshotOcrCompleted(snapshot, session.ocrBlocks))
+					.map((snapshot) => snapshot.id),
+			);
+			const pendingSnapshots = snapshots.filter(
+				(snapshot) => !completedSnapshotIds.has(snapshot.id),
+			);
+			if (pendingSnapshots.length === 0) {
+				if (session.status === "ocr-ready") {
+					return session;
+				}
+				const readySession = touchSession({
+					...session,
+					status: "ocr-ready",
+					candidates: buildGuideStepCandidates(session),
+				});
+				await this.writeSession(readySession);
+				return readySession;
+			}
+
+			const ocrClient =
+				this.dependencies.ocrClient ??
+				DefaultGuideOcrClient.fromConfig(await this.dependencies.ocrConfigProvider?.getOcrConfig());
+			const shouldFocusOcrSnapshots =
+				this.dependencies.focusOcrSnapshots ?? this.dependencies.ocrClient === undefined;
+			const eventsById = new Map(session.events.map((event) => [event.id, event]));
+			try {
+				for (const snapshot of pendingSnapshots) {
+					const focusedSnapshot = shouldFocusOcrSnapshots
+						? await createFocusedOcrSnapshot({
+								snapshot,
+								event: eventsById.get(snapshot.eventId),
+								outputDir: session.outputDir,
+							})
+						: { snapshot };
+					const recognizedBlocks = await ocrClient.recognize(focusedSnapshot.snapshot);
+					const blocks = remapFocusedOcrBlocks(recognizedBlocks, focusedSnapshot.transform);
+					session = await this.writeOcrSnapshotProgress(session, snapshot.id, blocks);
+				}
+			} catch (error) {
+				throw new GuideStoreError(
+					"guide-ocr-unavailable",
+					error instanceof Error ? error.message : "OCR failed.",
+					true,
+				);
+			}
+
+			return session;
+		});
+		guideOcrJobsByRecordingId.set(recordingId, nextJob);
+		try {
+			return await nextJob;
+		} finally {
+			if (guideOcrJobsByRecordingId.get(recordingId) === nextJob) {
+				guideOcrJobsByRecordingId.delete(recordingId);
+			}
+		}
+	}
+
+	private async writeOcrSnapshotProgress(
+		session: GuideSession,
+		snapshotId: string,
+		blocks: OcrBlock[],
+	): Promise<GuideSession> {
 		const updatedOcrBlocks = [
-			...session.ocrBlocks.filter((block) => !snapshotIds.has(block.snapshotId)),
+			...session.ocrBlocks.filter((block) => block.snapshotId !== snapshotId),
 			...blocks,
 		];
+		const completedAt = new Date().toISOString();
+		const updatedSnapshots = session.snapshots.map((snapshot) =>
+			snapshot.id === snapshotId ? { ...snapshot, ocrCompletedAt: completedAt } : snapshot,
+		);
 		const draftSession = {
 			...session,
+			snapshots: updatedSnapshots,
 			ocrBlocks: updatedOcrBlocks,
 		};
 		const updatedSession = touchSession({
@@ -662,6 +733,8 @@ function normalizeGuideSnapshot(input: unknown): GuideSnapshot | null {
 	const id = normalizeString(input.id);
 	const eventId = normalizeString(input.eventId);
 	const pathValue = normalizeString(input.path);
+	const markedPath = normalizeOptionalString(input.markedPath);
+	const ocrCompletedAt = normalizeOptionalString(input.ocrCompletedAt);
 	const timeMs = normalizeNonNegativeNumber(input.timeMs);
 	const offsetMs = normalizeOptionalNumber(input.offsetMs);
 	const width = normalizePositiveInteger(input.width);
@@ -677,7 +750,23 @@ function normalizeGuideSnapshot(input: unknown): GuideSnapshot | null {
 	) {
 		return null;
 	}
-	return { id, eventId, timeMs, offsetMs, path: pathValue, width, height };
+	return {
+		id,
+		eventId,
+		timeMs,
+		offsetMs,
+		path: pathValue,
+		markedPath,
+		ocrCompletedAt,
+		width,
+		height,
+	};
+}
+
+function isSnapshotOcrCompleted(snapshot: GuideSnapshot, ocrBlocks: OcrBlock[]): boolean {
+	return (
+		Boolean(snapshot.ocrCompletedAt) || ocrBlocks.some((block) => block.snapshotId === snapshot.id)
+	);
 }
 
 function normalizeOcrBlock(input: unknown): OcrBlock | null {

electron/guide/ocr/bundledOcrService.ts

@@ -1,14 +1,17 @@
-import { type ChildProcessWithoutNullStreams, spawn } from "node:child_process";
+import { type ChildProcessWithoutNullStreams, execFile, spawn } from "node:child_process";
 import fs from "node:fs/promises";
 import path from "node:path";
+import { promisify } from "node:util";
 import { app } from "electron";
 
 const DEFAULT_OCR_BASE_URL = "http://127.0.0.1:8866";
 const DEFAULT_OCR_PORT = "8866";
+const WINDOWS_SERVICE_NAME = "OpenScreenOCR";
 const SERVICE_EXE_NAME = "openscreen-ocr-service.exe";
 const HEALTH_TIMEOUT_MS = 1000;
 const STARTUP_TIMEOUT_MS = 90000;
 const PADDLEX_MODEL_NAMES = ["PP-OCRv5_mobile_det", "latin_PP-OCRv5_mobile_rec"];
+const execFileAsync = promisify(execFile);
 
 let ocrProcess: ChildProcessWithoutNullStreams | null = null;
 let startupPromise: Promise<void> | null = null;
@@ -24,6 +27,11 @@ export async function ensureBundledOcrServiceRunning(
 		return;
 	}
 
+	if (process.platform === "win32" && (await startInstalledWindowsOcrService())) {
+		await waitForOcrServiceHealth(baseUrl, STARTUP_TIMEOUT_MS);
+		return;
+	}
+
 	const executablePath = await findBundledOcrServiceExecutable();
 	if (!executablePath) {
 		return;
@@ -51,6 +59,39 @@ function shouldManageOcrService(baseUrl: string): boolean {
 	}
 }
 
+async function startInstalledWindowsOcrService(): Promise<boolean> {
+	const query = await runSc(["query", WINDOWS_SERVICE_NAME]);
+	if (!query.success) {
+		return false;
+	}
+	if (/\bRUNNING\b/i.test(query.output)) {
+		return true;
+	}
+
+	const start = await runSc(["start", WINDOWS_SERVICE_NAME]);
+	return start.success || /\b1056\b/.test(start.output) || /already running/i.test(start.output);
+}
+
+async function runSc(args: string[]): Promise<{ success: boolean; output: string }> {
+	try {
+		const result = await execFileAsync("sc.exe", args, {
+			windowsHide: true,
+			timeout: 10000,
+			maxBuffer: 512 * 1024,
+		});
+		return {
+			success: true,
+			output: `${result.stdout ?? ""}\n${result.stderr ?? ""}`,
+		};
+	} catch (error) {
+		const failed = error as { stdout?: string; stderr?: string };
+		return {
+			success: false,
+			output: `${failed.stdout ?? ""}\n${failed.stderr ?? ""}`,
+		};
+	}
+}
+
 async function findBundledOcrServiceExecutable(): Promise<string | null> {
 	const candidates = [
 		process.env.OPENSCREEN_GUIDE_OCR_EXE,
@@ -156,8 +197,11 @@ function startOcrServiceProcess(
 			OPENSCREEN_OCR_PORT: DEFAULT_OCR_PORT,
 			PADDLEOCR_DEVICE: process.env.PADDLEOCR_DEVICE ?? "cpu",
 			PADDLEOCR_ENABLE_MKLDNN: process.env.PADDLEOCR_ENABLE_MKLDNN ?? "0",
-			PADDLEOCR_LANG: process.env.PADDLEOCR_LANG ?? "latin",
+			PADDLEOCR_LANG: process.env.PADDLEOCR_LANG ?? "",
 			PADDLEOCR_USE_MOBILE: process.env.PADDLEOCR_USE_MOBILE ?? "1",
+			OPENSCREEN_OCR_PROFILE:
+				process.env.OPENSCREEN_OCR_PROFILE ?? process.env.OPENSCREEN_GUIDE_OCR_PROFILE ?? "",
+			OPENSCREEN_OCR_WARMUP: process.env.OPENSCREEN_OCR_WARMUP ?? "1",
 			PADDLE_PDX_ENABLE_MKLDNN_BYDEFAULT: process.env.PADDLE_PDX_ENABLE_MKLDNN_BYDEFAULT ?? "False",
 			PADDLE_PDX_CACHE_HOME: process.env.PADDLE_PDX_CACHE_HOME ?? runtimePaths.paddlexCachePath,
 			PADDLE_PDX_DISABLE_MODEL_SOURCE_CHECK:

electron/guide/ocr/paddleOcrClient.test.ts

@@ -1,8 +1,12 @@
-import { describe, expect, it } from "vitest";
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it, vi } from "vitest";
 import type { GuideSnapshot, OcrBlock } from "../../../src/guide/contracts";
 import {
 	DefaultGuideOcrClient,
 	normalizeOcrResponse,
+	PaddleOcrHttpClient,
 	parseWindowsOcrPayload,
 } from "./paddleOcrClient";
 
@@ -16,6 +20,10 @@ const snapshot: GuideSnapshot = {
 	height: 800,
 };
 
+afterEach(() => {
+	vi.unstubAllGlobals();
+});
+
 describe("normalizeOcrResponse", () => {
 	it("normalizes pixel boxes into guide OCR blocks", () => {
 		const blocks = normalizeOcrResponse(
@@ -67,6 +75,35 @@ describe("normalizeOcrResponse", () => {
 	});
 });
 
+describe("PaddleOcrHttpClient", () => {
+	it("sends the selected OCR profile to the local service", async () => {
+		const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "openscreen-ocr-client-"));
+		const imagePath = path.join(tempDir, "step.png");
+		await fs.writeFile(imagePath, Buffer.from([137, 80, 78, 71]));
+		const requests: unknown[] = [];
+		vi.stubGlobal(
+			"fetch",
+			vi.fn(async (_url: string, init?: RequestInit) => {
+				requests.push(JSON.parse(String(init?.body ?? "{}")));
+				return new Response(JSON.stringify({ blocks: [] }), {
+					status: 200,
+					headers: { "content-type": "application/json" },
+				});
+			}),
+		);
+
+		const client = new PaddleOcrHttpClient("https://ocr.example.test", "vi,en", "hybrid");
+		await client.recognize({ ...snapshot, path: imagePath });
+
+		expect(requests[0]).toMatchObject({
+			language: "vi,en",
+			profile: "hybrid",
+			path: imagePath,
+		});
+		await fs.rm(tempDir, { recursive: true, force: true });
+	});
+});
+
 describe("DefaultGuideOcrClient", () => {
 	it("falls back when the HTTP OCR service is unavailable", async () => {
 		const fallbackBlock: OcrBlock = {

electron/guide/ocr/paddleOcrClient.ts

@@ -1,7 +1,7 @@
 import { execFile } from "node:child_process";
 import fs from "node:fs/promises";
 import { promisify } from "node:util";
-import type { GuideSnapshot, OcrBlock } from "../../../src/guide/contracts";
+import type { GuideOcrProfile, GuideSnapshot, OcrBlock } from "../../../src/guide/contracts";
 import { ensureBundledOcrServiceRunning } from "./bundledOcrService";
 
 const execFileAsync = promisify(execFile);
@@ -10,6 +10,11 @@ export interface GuideOcrClient {
 	recognize(snapshot: GuideSnapshot): Promise<OcrBlock[]>;
 }
 
+export interface GuideOcrClientConfig {
+	profile: GuideOcrProfile;
+	language: string;
+}
+
 interface PaddleOcrResponseBlock {
 	text?: unknown;
 	confidence?: unknown;
@@ -21,7 +26,8 @@ interface PaddleOcrResponseBlock {
 export class PaddleOcrHttpClient implements GuideOcrClient {
 	constructor(
 		private readonly baseUrl = process.env.OPENSCREEN_GUIDE_OCR_URL ?? "http://127.0.0.1:8866",
-		private readonly language = process.env.OPENSCREEN_GUIDE_OCR_LANGUAGE ?? "vi,en",
+		private readonly language = normalizeOcrLanguage(process.env.OPENSCREEN_GUIDE_OCR_LANGUAGE),
+		private readonly profile = normalizeOcrProfile(process.env.OPENSCREEN_GUIDE_OCR_PROFILE),
 	) {}
 
 	async recognize(snapshot: GuideSnapshot): Promise<OcrBlock[]> {
@@ -36,6 +42,7 @@ export class PaddleOcrHttpClient implements GuideOcrClient {
 					imageBase64,
 					path: snapshot.path,
 					language: this.language,
+					profile: this.profile,
 				}),
 			});
 		} catch (error) {
@@ -54,7 +61,9 @@ export class PaddleOcrHttpClient implements GuideOcrClient {
 }
 
 export class WindowsOcrClient implements GuideOcrClient {
-	constructor(private readonly language = process.env.OPENSCREEN_GUIDE_OCR_LANGUAGE ?? "vi,en") {}
+	constructor(
+		private readonly language = normalizeOcrLanguage(process.env.OPENSCREEN_GUIDE_OCR_LANGUAGE),
+	) {}
 
 	async recognize(snapshot: GuideSnapshot): Promise<OcrBlock[]> {
 		if (process.platform !== "win32") {
@@ -96,6 +105,14 @@ export class WindowsOcrClient implements GuideOcrClient {
 }
 
 export class DefaultGuideOcrClient implements GuideOcrClient {
+	static fromConfig(config?: Partial<GuideOcrClientConfig>): DefaultGuideOcrClient {
+		const normalizedConfig = normalizeOcrClientConfig(config);
+		return new DefaultGuideOcrClient(
+			new PaddleOcrHttpClient(undefined, normalizedConfig.language, normalizedConfig.profile),
+			new WindowsOcrClient(normalizedConfig.language),
+		);
+	}
+
 	constructor(
 		private readonly httpClient = new PaddleOcrHttpClient(),
 		private readonly windowsClient = new WindowsOcrClient(),
@@ -119,6 +136,31 @@ export class DefaultGuideOcrClient implements GuideOcrClient {
 	}
 }
 
+function normalizeOcrClientConfig(
+	config: Partial<GuideOcrClientConfig> | undefined,
+): GuideOcrClientConfig {
+	return {
+		profile: normalizeOcrProfile(config?.profile ?? process.env.OPENSCREEN_GUIDE_OCR_PROFILE),
+		language: normalizeOcrLanguage(config?.language ?? process.env.OPENSCREEN_GUIDE_OCR_LANGUAGE),
+	};
+}
+
+function normalizeOcrProfile(value: string | undefined): GuideOcrProfile {
+	if (value === "fast" || value === "vietnamese" || value === "hybrid") {
+		return value;
+	}
+	return "vietnamese";
+}
+
+function normalizeOcrLanguage(value: string | undefined): string {
+	const normalized = value
+		?.split(",")
+		.map((part) => part.trim().toLowerCase())
+		.filter(Boolean)
+		.join(",");
+	return normalized || "vi,en";
+}
+
 export function parseWindowsOcrPayload(stdout: string): unknown {
 	const normalized = stdout.replace(/^\uFEFF/, "").trim();
 	try {

electron/ipc/handlers.ts

@@ -426,6 +426,7 @@ let nativeWindowsCursorRecordingStartMs = 0;
 let nativeWindowsPauseStartedAtMs: number | null = null;
 let nativeWindowsPauseRanges: Array<{ startMs: number; endMs: number }> = [];
 let nativeWindowsIsPaused = false;
+let nativeWindowsCaptureStopping = false;
 const NATIVE_WINDOWS_CAPTURE_STOP_TIMEOUT_MS = 15_000;
 let nativeMacCaptureProcess: ChildProcessWithoutNullStreams | null = null;
 let nativeMacCaptureOutput = "";
@@ -1337,6 +1338,81 @@ function completeNativeWindowsCursorPauseRange(endMs = Date.now()) {
 	nativeWindowsPauseStartedAtMs = null;
 }
 
+function resetNativeWindowsCaptureState() {
+	nativeWindowsCaptureProcess = null;
+	nativeWindowsCaptureTargetPath = null;
+	nativeWindowsCaptureWebcamTargetPath = null;
+	nativeWindowsCaptureRecordingId = null;
+	nativeWindowsCursorOffsetMs = 0;
+	nativeWindowsCursorCaptureMode = "editable-overlay";
+	nativeWindowsCursorRecordingStartMs = 0;
+	nativeWindowsPauseStartedAtMs = null;
+	nativeWindowsPauseRanges = [];
+	nativeWindowsIsPaused = false;
+	nativeWindowsCaptureStopping = false;
+	clearGuideHotkeyRecording();
+}
+
+function hasActiveNativeWindowsCaptureProcess() {
+	const proc = nativeWindowsCaptureProcess;
+	if (!proc) {
+		return false;
+	}
+	if (proc.exitCode === null && !proc.killed) {
+		return true;
+	}
+
+	console.warn("[native-wgc] clearing stale Windows capture process state", {
+		exitCode: proc.exitCode,
+		killed: proc.killed,
+	});
+	resetNativeWindowsCaptureState();
+	return false;
+}
+
+function attachNativeWindowsCaptureLifecycle(
+	proc: ChildProcessWithoutNullStreams,
+	sourceName: string,
+	onRecordingStateChange?: (recording: boolean, sourceName: string) => void,
+) {
+	const cleanupAfterUnexpectedExit = async () => {
+		try {
+			await stopCursorRecording();
+		} catch (error) {
+			console.warn("[native-wgc] failed to stop cursor recording after helper exit", error);
+		}
+		pendingCursorRecordingData = null;
+		resetNativeWindowsCaptureState();
+		onRecordingStateChange?.(false, sourceName);
+	};
+
+	function onClose(code: number | null, signal: NodeJS.Signals | null) {
+		proc.off("error", onError);
+		if (nativeWindowsCaptureProcess !== proc || nativeWindowsCaptureStopping) {
+			return;
+		}
+
+		console.warn("[native-wgc] Windows capture helper exited before stop was requested", {
+			code,
+			signal,
+			output: nativeWindowsCaptureOutput.trim(),
+		});
+		void cleanupAfterUnexpectedExit();
+	}
+	function onError(error: Error) {
+		proc.off("close", onClose);
+		if (nativeWindowsCaptureProcess !== proc || nativeWindowsCaptureStopping) {
+			return;
+		}
+
+		console.warn("[native-wgc] Windows capture helper errored before stop was requested", error);
+		void cleanupAfterUnexpectedExit();
+	}
+
+	proc.once("close", onClose);
+	proc.once("error", onError);
+}
+
 function waitForNativeWindowsCaptureStart(proc: ChildProcessWithoutNullStreams) {
 	return new Promise<void>((resolve, reject) => {
 		const timer = setTimeout(() => {
@@ -1732,7 +1808,7 @@ export function registerIpcHandlers(
 		const sources = await desktopCapturer.getSources(opts);
 		lastEnumeratedSources = new Map(sources.map((source) => [source.id, source]));
 		let screenSourceIndex = 0;
-		return sources.map((source) => {
+		const processedSources = sources.map((source) => {
 			const isScreenSource = source.id.startsWith("screen:");
 			const sourceIndex = isScreenSource
 				? (parseDesktopCapturerScreenIndex(source.id) ?? screenSourceIndex)
@@ -1760,6 +1836,43 @@ export function registerIpcHandlers(
 				bounds,
 			};
 		});
+		const screenDisplays = screen.getAllDisplays();
+		const mappedDisplayIds = new Set(
+			processedSources
+				.filter((source) => source.id.startsWith("screen:") && typeof source.displayId === "number")
+				.map((source) => source.displayId),
+		);
+		const fallbackScreenSources = screenDisplays
+			.map((display, displayIndex) => ({ display, displayIndex }))
+			.filter(({ display }) => !mappedDisplayIds.has(display.id))
+			.map(({ display, displayIndex }) => {
+				const bounds = toSourceBounds(display.bounds);
+				return {
+					id: `screen:${displayIndex}:fallback:${display.id}`,
+					name: `Screen ${displayIndex + 1}`,
+					display_id: String(display.id),
+					thumbnail: null,
+					appIcon: null,
+					displayId: display.id,
+					displayIndex,
+					screenIndex: displayIndex,
+					displayLabel: `Display ${displayIndex + 1} - ${bounds.width}x${bounds.height} @ ${bounds.x},${bounds.y}`,
+					bounds,
+				};
+			});
+		if (fallbackScreenSources.length > 0) {
+			console.warn("[desktop-capturer] added fallback display sources", {
+				capturerScreens: processedSources.filter((source) => source.id.startsWith("screen:"))
+					.length,
+				electronDisplays: screenDisplays.length,
+				fallbackScreens: fallbackScreenSources.map((source) => ({
+					id: source.id,
+					displayId: source.displayId,
+					bounds: source.bounds,
+				})),
+			});
+		}
+		return [...processedSources, ...fallbackScreenSources];
 	});
 
 	ipcMain.handle("select-source", async (_, source: SelectedSource) => {
@@ -1964,7 +2077,7 @@ export function registerIpcHandlers(
 						error: "Windows Graphics Capture requires Windows 10 build 19041 or newer.",
 					};
 				}
-				if (nativeWindowsCaptureProcess) {
+				if (hasActiveNativeWindowsCaptureProcess()) {
 					return { success: false, error: "Native Windows capture is already running." };
 				}
 
@@ -2113,6 +2226,7 @@ export function registerIpcHandlers(
 				});
 
 				const source = selectedSource || { name: "Screen" };
+				attachNativeWindowsCaptureLifecycle(proc, source.name, onRecordingStateChange);
 				startGuideHotkeyRecording(recordingId, bounds);
 				if (onRecordingStateChange) {
 					onRecordingStateChange(true, source.name);
@@ -2127,17 +2241,7 @@ export function registerIpcHandlers(
 			} catch (error) {
 				console.error("Failed to start native Windows recording:", error);
 				nativeWindowsCaptureProcess?.kill();
-				nativeWindowsCaptureProcess = null;
+				resetNativeWindowsCaptureState();
-				nativeWindowsCaptureTargetPath = null;
-				nativeWindowsCaptureWebcamTargetPath = null;
-				nativeWindowsCaptureRecordingId = null;
-				nativeWindowsCursorOffsetMs = 0;
-				nativeWindowsCursorCaptureMode = "editable-overlay";
-				nativeWindowsCursorRecordingStartMs = 0;
-				nativeWindowsPauseStartedAtMs = null;
-				nativeWindowsPauseRanges = [];
-				nativeWindowsIsPaused = false;
-				clearGuideHotkeyRecording();
 				await stopCursorRecording();
 				return { success: false, error: String(error) };
 			}
@@ -2396,11 +2500,13 @@ export function registerIpcHandlers(
 		const recordingId = nativeWindowsCaptureRecordingId ?? Date.now();
 		const cursorCaptureMode = nativeWindowsCursorCaptureMode;
 
-		if (!proc) {
+		if (!proc || proc.exitCode !== null || proc.killed) {
+			resetNativeWindowsCaptureState();
 			return { success: false, error: "Native Windows capture is not running." };
 		}
 
 		try {
+			nativeWindowsCaptureStopping = true;
 			completeNativeWindowsCursorPauseRange();
 			const stoppedPathPromise = waitForNativeWindowsCaptureStop(proc);
 			proc.stdin.write("stop\n");
@@ -2462,17 +2568,7 @@ export function registerIpcHandlers(
 			await stopCursorRecording();
 			return { success: false, error: String(error) };
 		} finally {
-			nativeWindowsCaptureProcess = null;
+			resetNativeWindowsCaptureState();
-			nativeWindowsCaptureTargetPath = null;
-			nativeWindowsCaptureWebcamTargetPath = null;
-			nativeWindowsCaptureRecordingId = null;
-			nativeWindowsCursorOffsetMs = 0;
-			nativeWindowsCursorCaptureMode = "editable-overlay";
-			nativeWindowsCursorRecordingStartMs = 0;
-			nativeWindowsPauseStartedAtMs = null;
-			nativeWindowsPauseRanges = [];
-			nativeWindowsIsPaused = false;
-			clearGuideHotkeyRecording();
 			const source = selectedSource || { name: "Screen" };
 			if (onRecordingStateChange) {
 				onRecordingStateChange(false, source.name);
@@ -2637,6 +2733,7 @@ export function registerIpcHandlers(
 	);
 	const guideStore = new GuideStore(RECORDINGS_DIR, {
 		deepSeekConfigProvider: guideAiSettingsStore,
+		ocrConfigProvider: guideAiSettingsStore,
 	});
 	registerGuideMarkerHotkey(guideStore);
 	registerGuideIpcHandlers(ipcMain, guideStore, guideAiSettingsStore, {

electron/main.ts

@@ -13,6 +13,7 @@ import {
 } from "electron";
 import { mainT, setMainLocale } from "./i18n";
 import { getSelectedDesktopSource, registerIpcHandlers } from "./ipc/handlers";
+import { initializeAutoUpdates } from "./updater";
 import {
 	createCountdownOverlayWindow,
 	createEditorWindow,
@@ -515,6 +516,7 @@ app.whenReady().then(async () => {
 	createTray();
 	updateTrayMenu();
 	setupApplicationMenu();
+	initializeAutoUpdates();
 	// Ensure recordings directory exists
 	await ensureRecordingsDir();
 

electron/native/wgc-capture/CMakeLists.txt

@@ -81,3 +81,21 @@ target_compile_options(guide-hotkey-listener PRIVATE /EHsc /W4 /utf-8)
 target_link_libraries(guide-hotkey-listener PRIVATE
   user32
 )
+
+add_executable(openscreen-ocr-service-wrapper
+  src/ocr-service-wrapper.cpp
+)
+
+target_compile_definitions(openscreen-ocr-service-wrapper PRIVATE
+  NOMINMAX
+  WIN32_LEAN_AND_MEAN
+  UNICODE
+  _UNICODE
+  _WIN32_WINNT=0x0A00
+)
+
+target_compile_options(openscreen-ocr-service-wrapper PRIVATE /EHsc /W4 /utf-8)
+
+target_link_libraries(openscreen-ocr-service-wrapper PRIVATE
+  advapi32
+)

electron/native/wgc-capture/src/ocr-service-wrapper.cpp

@@ -0,0 +1,263 @@
+#include <Windows.h>
+
+#include <algorithm>
+#include <iostream>
+#include <string>
+#include <vector>
+
+namespace {
+
+constexpr const wchar_t* SERVICE_NAME = L"OpenScreenOCR";
+
+struct ServiceConfig {
+    std::wstring exePath;
+    std::wstring resourcesPath;
+    std::wstring dataPath;
+};
+
+SERVICE_STATUS_HANDLE g_statusHandle = nullptr;
+SERVICE_STATUS g_status{};
+HANDLE g_stopEvent = nullptr;
+PROCESS_INFORMATION g_childProcess{};
+ServiceConfig g_config;
+
+std::wstring quoteArg(const std::wstring& value) {
+    std::wstring result = L"\"";
+    for (wchar_t ch : value) {
+        if (ch == L'"') {
+            result += L"\\\"";
+        } else {
+            result.push_back(ch);
+        }
+    }
+    result += L"\"";
+    return result;
+}
+
+std::wstring directoryName(const std::wstring& path) {
+    const size_t slash = path.find_last_of(L"\\/");
+    return slash == std::wstring::npos ? L"." : path.substr(0, slash);
+}
+
+void createDirectoryRecursive(const std::wstring& path) {
+    if (path.empty()) {
+        return;
+    }
+
+    std::wstring current;
+    for (size_t i = 0; i < path.size(); ++i) {
+        current.push_back(path[i]);
+        if (path[i] != L'\\' && path[i] != L'/') {
+            continue;
+        }
+        if (current.size() > 3) {
+            CreateDirectoryW(current.c_str(), nullptr);
+        }
+    }
+    CreateDirectoryW(path.c_str(), nullptr);
+}
+
+void setEnv(const wchar_t* name, const std::wstring& value) {
+    SetEnvironmentVariableW(name, value.empty() ? nullptr : value.c_str());
+}
+
+void setServiceStatus(DWORD state, DWORD win32ExitCode = NO_ERROR, DWORD waitHint = 0) {
+    if (!g_statusHandle) {
+        return;
+    }
+
+    g_status.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
+    g_status.dwCurrentState = state;
+    g_status.dwWin32ExitCode = win32ExitCode;
+    g_status.dwWaitHint = waitHint;
+    g_status.dwControlsAccepted =
+        state == SERVICE_RUNNING ? SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN : 0;
+    static DWORD checkpoint = 1;
+    g_status.dwCheckPoint =
+        state == SERVICE_START_PENDING || state == SERVICE_STOP_PENDING ? checkpoint++ : 0;
+    SetServiceStatus(g_statusHandle, &g_status);
+}
+
+HANDLE openServiceLog(const std::wstring& dataPath) {
+    const std::wstring logDir = dataPath + L"\\logs";
+    createDirectoryRecursive(logDir);
+    const std::wstring logPath = logDir + L"\\ocr-service.log";
+    SECURITY_ATTRIBUTES securityAttributes{};
+    securityAttributes.nLength = sizeof(securityAttributes);
+    securityAttributes.bInheritHandle = TRUE;
+    HANDLE file = CreateFileW(
+        logPath.c_str(),
+        FILE_APPEND_DATA,
+        FILE_SHARE_READ | FILE_SHARE_WRITE,
+        &securityAttributes,
+        OPEN_ALWAYS,
+        FILE_ATTRIBUTE_NORMAL,
+        nullptr);
+    if (file != INVALID_HANDLE_VALUE) {
+        SetFilePointer(file, 0, nullptr, FILE_END);
+    }
+    return file;
+}
+
+bool startOcrProcess(const ServiceConfig& config) {
+    if (config.exePath.empty()) {
+        return false;
+    }
+
+    const std::wstring dataPath = config.dataPath.empty()
+        ? directoryName(config.exePath) + L"\\ocr-runtime"
+        : config.dataPath;
+    const std::wstring resourcesPath = config.resourcesPath.empty()
+        ? directoryName(directoryName(config.exePath))
+        : config.resourcesPath;
+    const std::wstring modelCachePath = dataPath + L"\\ocr-models";
+    const std::wstring paddlexCachePath = resourcesPath + L"\\ocr-models\\paddlex";
+
+    createDirectoryRecursive(dataPath);
+    createDirectoryRecursive(modelCachePath);
+
+    setEnv(L"OPENSCREEN_OCR_HOST", L"127.0.0.1");
+    setEnv(L"OPENSCREEN_OCR_PORT", L"8866");
+    setEnv(L"PADDLEOCR_DEVICE", L"cpu");
+    setEnv(L"PADDLEOCR_ENABLE_MKLDNN", L"0");
+    setEnv(L"PADDLEOCR_LANG", L"");
+    setEnv(L"PADDLEOCR_USE_MOBILE", L"1");
+    setEnv(L"OPENSCREEN_OCR_PROFILE", L"vietnamese");
+    setEnv(L"OPENSCREEN_OCR_WARMUP", L"1");
+    setEnv(L"PADDLE_PDX_ENABLE_MKLDNN_BYDEFAULT", L"False");
+    setEnv(L"PADDLE_PDX_CACHE_HOME", paddlexCachePath);
+    setEnv(L"PADDLE_PDX_DISABLE_MODEL_SOURCE_CHECK", L"True");
+    setEnv(L"PADDLE_HOME", modelCachePath + L"\\paddle");
+    setEnv(L"PADDLEOCR_HOME", modelCachePath + L"\\paddleocr");
+    setEnv(L"PYTHONUTF8", L"1");
+
+    STARTUPINFOW startupInfo{};
+    startupInfo.cb = sizeof(startupInfo);
+    HANDLE logFile = openServiceLog(dataPath);
+    if (logFile != INVALID_HANDLE_VALUE) {
+        startupInfo.dwFlags |= STARTF_USESTDHANDLES;
+        startupInfo.hStdOutput = logFile;
+        startupInfo.hStdError = logFile;
+        startupInfo.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
+    }
+
+    std::wstring commandLine = quoteArg(config.exePath);
+    const std::wstring cwd = directoryName(config.exePath);
+    ZeroMemory(&g_childProcess, sizeof(g_childProcess));
+    const BOOL created = CreateProcessW(
+        config.exePath.c_str(),
+        commandLine.data(),
+        nullptr,
+        nullptr,
+        TRUE,
+        CREATE_NO_WINDOW,
+        nullptr,
+        cwd.c_str(),
+        &startupInfo,
+        &g_childProcess);
+
+    if (logFile != INVALID_HANDLE_VALUE) {
+        CloseHandle(logFile);
+    }
+    return created == TRUE;
+}
+
+void stopOcrProcess() {
+    if (g_childProcess.hProcess) {
+        TerminateProcess(g_childProcess.hProcess, 0);
+        WaitForSingleObject(g_childProcess.hProcess, 10000);
+        CloseHandle(g_childProcess.hProcess);
+        g_childProcess.hProcess = nullptr;
+    }
+    if (g_childProcess.hThread) {
+        CloseHandle(g_childProcess.hThread);
+        g_childProcess.hThread = nullptr;
+    }
+}
+
+DWORD WINAPI serviceControlHandler(DWORD control, DWORD, LPVOID, LPVOID) {
+    if (control == SERVICE_CONTROL_STOP || control == SERVICE_CONTROL_SHUTDOWN) {
+        setServiceStatus(SERVICE_STOP_PENDING, NO_ERROR, 10000);
+        if (g_stopEvent) {
+            SetEvent(g_stopEvent);
+        }
+        stopOcrProcess();
+        return NO_ERROR;
+    }
+    return NO_ERROR;
+}
+
+void WINAPI serviceMain(DWORD, LPWSTR*) {
+    g_statusHandle = RegisterServiceCtrlHandlerExW(SERVICE_NAME, serviceControlHandler, nullptr);
+    if (!g_statusHandle) {
+        return;
+    }
+
+    setServiceStatus(SERVICE_START_PENDING, NO_ERROR, 30000);
+    g_stopEvent = CreateEventW(nullptr, TRUE, FALSE, nullptr);
+    if (!g_stopEvent || !startOcrProcess(g_config)) {
+        setServiceStatus(SERVICE_STOPPED, ERROR_SERVICE_SPECIFIC_ERROR);
+        return;
+    }
+
+    setServiceStatus(SERVICE_RUNNING);
+    HANDLE waitHandles[] = {g_stopEvent, g_childProcess.hProcess};
+    WaitForMultipleObjects(2, waitHandles, FALSE, INFINITE);
+    stopOcrProcess();
+    if (g_stopEvent) {
+        CloseHandle(g_stopEvent);
+        g_stopEvent = nullptr;
+    }
+    setServiceStatus(SERVICE_STOPPED);
+}
+
+ServiceConfig parseConfig(int argc, wchar_t* argv[]) {
+    ServiceConfig config;
+    for (int i = 1; i < argc; ++i) {
+        const std::wstring arg = argv[i];
+        auto readNext = [&](std::wstring& target) {
+            if (i + 1 < argc) {
+                target = argv[++i];
+            }
+        };
+        if (arg == L"--exe") {
+            readNext(config.exePath);
+        } else if (arg == L"--resources") {
+            readNext(config.resourcesPath);
+        } else if (arg == L"--data") {
+            readNext(config.dataPath);
+        }
+    }
+    return config;
+}
+
+bool hasServiceFlag(int argc, wchar_t* argv[]) {
+    for (int i = 1; i < argc; ++i) {
+        if (std::wstring(argv[i]) == L"--service") {
+            return true;
+        }
+    }
+    return false;
+}
+
+} // namespace
+
+int wmain(int argc, wchar_t* argv[]) {
+    g_config = parseConfig(argc, argv);
+
+    if (hasServiceFlag(argc, argv)) {
+        SERVICE_TABLE_ENTRYW serviceTable[] = {
+            {const_cast<LPWSTR>(SERVICE_NAME), serviceMain},
+            {nullptr, nullptr},
+        };
+        return StartServiceCtrlDispatcherW(serviceTable) ? 0 : 1;
+    }
+
+    if (!startOcrProcess(g_config)) {
+        std::wcerr << L"Failed to start OCR service process." << std::endl;
+        return 1;
+    }
+    WaitForSingleObject(g_childProcess.hProcess, INFINITE);
+    stopOcrProcess();
+    return 0;
+}

electron/native/wgc-capture/src/wgc_session.cpp

@@ -28,6 +28,60 @@ bool succeeded(HRESULT hr, const char* label) {
     return false;
 }
 
+Microsoft::WRL::ComPtr<IDXGIAdapter1> findAdapterForMonitor(HMONITOR monitor) {
+    if (!monitor) {
+        return nullptr;
+    }
+
+    Microsoft::WRL::ComPtr<IDXGIFactory1> factory;
+    HRESULT hr = CreateDXGIFactory1(IID_PPV_ARGS(&factory));
+    if (FAILED(hr) || !factory) {
+        std::cerr << "WARNING: CreateDXGIFactory1 failed while resolving monitor adapter (hr=0x"
+                  << std::hex << hr << std::dec << ")" << std::endl;
+        return nullptr;
+    }
+
+    for (UINT adapterIndex = 0;; ++adapterIndex) {
+        Microsoft::WRL::ComPtr<IDXGIAdapter1> adapter;
+        hr = factory->EnumAdapters1(adapterIndex, adapter.GetAddressOf());
+        if (hr == DXGI_ERROR_NOT_FOUND) {
+            break;
+        }
+        if (FAILED(hr) || !adapter) {
+            continue;
+        }
+
+        DXGI_ADAPTER_DESC1 adapterDesc{};
+        if (SUCCEEDED(adapter->GetDesc1(&adapterDesc)) &&
+            (adapterDesc.Flags & DXGI_ADAPTER_FLAG_SOFTWARE) != 0) {
+            continue;
+        }
+
+        for (UINT outputIndex = 0;; ++outputIndex) {
+            Microsoft::WRL::ComPtr<IDXGIOutput> output;
+            hr = adapter->EnumOutputs(outputIndex, output.GetAddressOf());
+            if (hr == DXGI_ERROR_NOT_FOUND) {
+                break;
+            }
+            if (FAILED(hr) || !output) {
+                continue;
+            }
+
+            DXGI_OUTPUT_DESC outputDesc{};
+            if (SUCCEEDED(output->GetDesc(&outputDesc)) && outputDesc.Monitor == monitor) {
+                std::cout << "{\"event\":\"display-adapter-resolved\",\"schemaVersion\":2,"
+                          << "\"adapterIndex\":" << adapterIndex
+                          << ",\"outputIndex\":" << outputIndex << "}" << std::endl;
+                return adapter;
+            }
+        }
+    }
+
+    std::cerr << "WARNING: Could not resolve DXGI adapter for selected monitor; using default adapter"
+              << std::endl;
+    return nullptr;
+}
+
 int64_t timeSpanToHns(wf::TimeSpan const& value) {
     return value.count();
 }
@@ -38,7 +92,7 @@ WgcSession::~WgcSession() {
     stop();
 }
 
-bool WgcSession::createD3DDevice() {
+bool WgcSession::createD3DDevice(IDXGIAdapter* adapter) {
     UINT flags = D3D11_CREATE_DEVICE_BGRA_SUPPORT;
 #if defined(_DEBUG)
     flags |= D3D11_CREATE_DEVICE_DEBUG;
@@ -53,8 +107,8 @@ bool WgcSession::createD3DDevice() {
     D3D_FEATURE_LEVEL featureLevel{};
 
     HRESULT hr = D3D11CreateDevice(
-        nullptr,
+        adapter,
-        D3D_DRIVER_TYPE_HARDWARE,
+        adapter ? D3D_DRIVER_TYPE_UNKNOWN : D3D_DRIVER_TYPE_HARDWARE,
         nullptr,
         flags,
         featureLevels,
@@ -67,6 +121,23 @@ bool WgcSession::createD3DDevice() {
 #if defined(_DEBUG)
     if (FAILED(hr)) {
         flags &= ~D3D11_CREATE_DEVICE_DEBUG;
+        hr = D3D11CreateDevice(
+            adapter,
+            adapter ? D3D_DRIVER_TYPE_UNKNOWN : D3D_DRIVER_TYPE_HARDWARE,
+            nullptr,
+            flags,
+            featureLevels,
+            ARRAYSIZE(featureLevels),
+            D3D11_SDK_VERSION,
+            &d3dDevice_,
+            &featureLevel,
+            &d3dContext_);
+    }
+#endif
+
+    if (FAILED(hr) && adapter) {
+        std::cerr << "WARNING: D3D11CreateDevice failed for selected monitor adapter (hr=0x"
+                  << std::hex << hr << std::dec << "); retrying default adapter" << std::endl;
         hr = D3D11CreateDevice(
             nullptr,
             D3D_DRIVER_TYPE_HARDWARE,
@@ -79,7 +150,6 @@ bool WgcSession::createD3DDevice() {
             &featureLevel,
             &d3dContext_);
     }
-#endif
 
     if (!succeeded(hr, "D3D11CreateDevice")) {
         return false;
@@ -100,6 +170,11 @@ bool WgcSession::createD3DDevice() {
     return true;
 }
 
+bool WgcSession::createD3DDeviceForMonitor(HMONITOR monitor) {
+    auto adapter = findAdapterForMonitor(monitor);
+    return createD3DDevice(adapter.Get());
+}
+
 bool WgcSession::createCaptureItem(HMONITOR monitor) {
     auto factory = winrt::get_activation_factory<wgcap::GraphicsCaptureItem>();
     auto interop = factory.as<IGraphicsCaptureItemInterop>();
@@ -188,7 +263,7 @@ bool WgcSession::applySessionOptions(bool captureCursor) {
 
 bool WgcSession::initialize(HMONITOR monitor, int fps, bool captureCursor) {
     fps_ = fps > 0 ? fps : 60;
-    if (!createD3DDevice()) {
+    if (!createD3DDeviceForMonitor(monitor)) {
         return false;
     }
     if (!createCaptureItem(monitor)) {

electron/native/wgc-capture/src/wgc_session.h

@@ -2,6 +2,7 @@
 
 #include <Windows.h>
 #include <d3d11.h>
+#include <dxgi.h>
 #include <windows.graphics.capture.h>
 #include <windows.graphics.directx.direct3d11.interop.h>
 #include <winrt/Windows.Foundation.h>
@@ -34,7 +35,8 @@ public:
     ID3D11DeviceContext* context() const;
 
 private:
-    bool createD3DDevice();
+    bool createD3DDevice(IDXGIAdapter* adapter = nullptr);
+    bool createD3DDeviceForMonitor(HMONITOR monitor);
     bool createCaptureItem(HMONITOR monitor);
     bool createCaptureItem(HWND window);
     bool applySessionOptions(bool captureCursor);

electron/preload.ts

@@ -26,6 +26,27 @@ const assetBaseUrl = assetBaseUrlArg ? assetBaseUrlArg.slice(ASSET_BASE_URL_ARG_
 
 contextBridge.exposeInMainWorld("electronAPI", {
 	assetBaseUrl,
+	updates: {
+		getStatus: () => {
+			return ipcRenderer.invoke("updates:get-status");
+		},
+		check: () => {
+			return ipcRenderer.invoke("updates:check");
+		},
+		install: () => {
+			return ipcRenderer.invoke("updates:install");
+		},
+		onStatus: (callback: (status: import("../src/lib/updateStatus").UpdateStatus) => void) => {
+			const listener = (
+				_event: Electron.IpcRendererEvent,
+				status: import("../src/lib/updateStatus").UpdateStatus,
+			) => {
+				callback(status);
+			};
+			ipcRenderer.on("updates:status", listener);
+			return () => ipcRenderer.removeListener("updates:status", listener);
+		},
+	},
 	invokeNativeBridge: <TData>(request: NativeBridgeRequest) => {
 		return ipcRenderer.invoke(NATIVE_BRIDGE_CHANNEL, request) as Promise<TData>;
 	},

electron/updater.ts

@@ -0,0 +1,177 @@
+import { app, BrowserWindow, ipcMain } from "electron";
+import { autoUpdater, type ProgressInfo, type UpdateInfo } from "electron-updater";
+import type { UpdateCheckResult, UpdateStatus } from "../src/lib/updateStatus";
+
+const DEFAULT_UPDATE_FEED_URL =
+	"https://gittea.softs.business/huanld/openscreen/raw/branch/release-assets%2Flatest";
+const AUTO_CHECK_DELAY_MS = 10_000;
+const AUTO_CHECK_INTERVAL_MS = 4 * 60 * 60 * 1000;
+
+let status: UpdateStatus = createStatus("idle");
+let handlersRegistered = false;
+let initialized = false;
+let checkInFlight: Promise<UpdateCheckResult> | null = null;
+
+function createStatus(
+	phase: UpdateStatus["phase"],
+	patch: Partial<UpdateStatus> = {},
+): UpdateStatus {
+	return {
+		phase,
+		currentVersion: app.getVersion(),
+		updatedAt: new Date().toISOString(),
+		...patch,
+	};
+}
+
+function normalizeReleaseNotes(releaseNotes: UpdateInfo["releaseNotes"]): string | undefined {
+	if (typeof releaseNotes === "string") {
+		return releaseNotes;
+	}
+	if (Array.isArray(releaseNotes)) {
+		return releaseNotes
+			.map((note) => note.note)
+			.filter(Boolean)
+			.join("\n\n");
+	}
+	return undefined;
+}
+
+function updateStatus(next: UpdateStatus) {
+	status = next;
+	for (const window of BrowserWindow.getAllWindows()) {
+		if (!window.isDestroyed()) {
+			window.webContents.send("updates:status", status);
+		}
+	}
+}
+
+function statusFromInfo(phase: UpdateStatus["phase"], info: UpdateInfo): UpdateStatus {
+	return createStatus(phase, {
+		version: info.version,
+		releaseName: info.releaseName ?? undefined,
+		releaseNotes: normalizeReleaseNotes(info.releaseNotes),
+	});
+}
+
+async function checkForUpdates(): Promise<UpdateCheckResult> {
+	if (!initialized) {
+		updateStatus(
+			createStatus("unsupported", {
+				error: "Update service is not initialized.",
+			}),
+		);
+		return { success: false, status, error: status.error };
+	}
+
+	if (!app.isPackaged && process.env.OPENSCREEN_ALLOW_DEV_UPDATE_CHECK !== "1") {
+		updateStatus(
+			createStatus("unsupported", {
+				error: "Update checks only run in packaged builds.",
+			}),
+		);
+		return { success: false, status, error: status.error };
+	}
+
+	if (checkInFlight) {
+		return checkInFlight;
+	}
+
+	updateStatus(createStatus("checking"));
+	checkInFlight = autoUpdater
+		.checkForUpdates()
+		.then(() => ({ success: true, status }))
+		.catch((error) => {
+			const message = error instanceof Error ? error.message : String(error);
+			updateStatus(createStatus("error", { error: message }));
+			return { success: false, status, error: message };
+		})
+		.finally(() => {
+			checkInFlight = null;
+		});
+
+	return checkInFlight;
+}
+
+function registerUpdateIpcHandlers() {
+	if (handlersRegistered) {
+		return;
+	}
+
+	handlersRegistered = true;
+	ipcMain.handle("updates:get-status", () => status);
+	ipcMain.handle("updates:check", () => checkForUpdates());
+	ipcMain.handle("updates:install", () => {
+		if (status.phase !== "downloaded") {
+			return {
+				success: false,
+				status,
+				error: "No downloaded update is ready to install.",
+			};
+		}
+		setImmediate(() => autoUpdater.quitAndInstall(false, true));
+		return { success: true, status };
+	});
+}
+
+export function initializeAutoUpdates() {
+	registerUpdateIpcHandlers();
+
+	if (initialized) {
+		return;
+	}
+
+	initialized = true;
+	autoUpdater.autoDownload = true;
+	autoUpdater.autoInstallOnAppQuit = true;
+	autoUpdater.logger = console;
+
+	const feedUrl = process.env.OPENSCREEN_UPDATE_FEED_URL?.trim() || DEFAULT_UPDATE_FEED_URL;
+	const updateToken = process.env.OPENSCREEN_UPDATE_TOKEN?.trim();
+	if (updateToken) {
+		autoUpdater.requestHeaders = {
+			Authorization: `token ${updateToken}`,
+		};
+	}
+	autoUpdater.setFeedURL({
+		provider: "generic",
+		url: feedUrl,
+	});
+
+	autoUpdater.on("checking-for-update", () => {
+		updateStatus(createStatus("checking"));
+	});
+	autoUpdater.on("update-available", (info) => {
+		updateStatus(statusFromInfo("available", info));
+	});
+	autoUpdater.on("update-not-available", (info) => {
+		updateStatus(statusFromInfo("not-available", info));
+	});
+	autoUpdater.on("download-progress", (progress: ProgressInfo) => {
+		updateStatus(
+			createStatus("downloading", {
+				version: status.version,
+				releaseName: status.releaseName,
+				releaseNotes: status.releaseNotes,
+				percent: progress.percent,
+				bytesPerSecond: progress.bytesPerSecond,
+				transferred: progress.transferred,
+				total: progress.total,
+			}),
+		);
+	});
+	autoUpdater.on("update-downloaded", (info) => {
+		updateStatus(statusFromInfo("downloaded", info));
+	});
+	autoUpdater.on("error", (error) => {
+		const message = error instanceof Error ? error.message : String(error);
+		updateStatus(createStatus("error", { error: message }));
+	});
+
+	setTimeout(() => {
+		void checkForUpdates();
+	}, AUTO_CHECK_DELAY_MS);
+	setInterval(() => {
+		void checkForUpdates();
+	}, AUTO_CHECK_INTERVAL_MS).unref();
+}

package-lock.json

@@ -1,12 +1,12 @@
 {
 	"name": "openscreen",
-	"version": "1.4.2",
+	"version": "1.4.12",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
 			"name": "openscreen",
-			"version": "1.4.2",
+			"version": "1.4.12",
 			"dependencies": {
 				"@fix-webm-duration/fix": "^1.0.1",
 				"@pixi/filter-drop-shadow": "^5.2.0",
@@ -29,6 +29,7 @@
 				"class-variance-authority": "^0.7.1",
 				"clsx": "^2.1.1",
 				"dnd-timeline": "^2.4.0",
+				"electron-updater": "^6.8.3",
 				"emoji-picker-react": "^4.18.0",
 				"fix-webm-duration": "^1.0.6",
 				"gif.js": "^0.2.0",
@@ -4625,7 +4626,6 @@
 			"version": "2.0.1",
 			"resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
 			"integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==",
-			"dev": true,
 			"license": "Python-2.0"
 		},
 		"node_modules/aria-hidden": {
@@ -4959,7 +4959,6 @@
 			"version": "9.5.1",
 			"resolved": "https://registry.npmjs.org/builder-util-runtime/-/builder-util-runtime-9.5.1.tgz",
 			"integrity": "sha512-qt41tMfgHTllhResqM5DcnHyDIWNgzHvuY2jDcYP9iaGpkWxTUzV6GQjDeLnlR1/DtdlcsWQbA7sByMpmJFTLQ==",
-			"dev": true,
 			"license": "MIT",
 			"dependencies": {
 				"debug": "^4.3.4",
@@ -5504,7 +5503,6 @@
 			"version": "4.4.3",
 			"resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
 			"integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
-			"dev": true,
 			"license": "MIT",
 			"dependencies": {
 				"ms": "^2.1.3"
@@ -6015,6 +6013,69 @@
 			"dev": true,
 			"license": "ISC"
 		},
+		"node_modules/electron-updater": {
+			"version": "6.8.3",
+			"resolved": "https://registry.npmjs.org/electron-updater/-/electron-updater-6.8.3.tgz",
+			"integrity": "sha512-Z6sgw3jgbikWKXei1ENdqFOxBP0WlXg3TtKfz0rgw2vIZFJUyI4pD7ZN7jrkm7EoMK+tcm/qTnPUdqfZukBlBQ==",
+			"license": "MIT",
+			"dependencies": {
+				"builder-util-runtime": "9.5.1",
+				"fs-extra": "^10.1.0",
+				"js-yaml": "^4.1.0",
+				"lazy-val": "^1.0.5",
+				"lodash.escaperegexp": "^4.1.2",
+				"lodash.isequal": "^4.5.0",
+				"semver": "~7.7.3",
+				"tiny-typed-emitter": "^2.1.0"
+			}
+		},
+		"node_modules/electron-updater/node_modules/fs-extra": {
+			"version": "10.1.0",
+			"resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-10.1.0.tgz",
+			"integrity": "sha512-oRXApq54ETRj4eMiFzGnHWGy+zo5raudjuxN0b8H7s/RU2oW0Wvsx9O0ACRN/kRq9E8Vu/ReskGB5o3ji+FzHQ==",
+			"license": "MIT",
+			"dependencies": {
+				"graceful-fs": "^4.2.0",
+				"jsonfile": "^6.0.1",
+				"universalify": "^2.0.0"
+			},
+			"engines": {
+				"node": ">=12"
+			}
+		},
+		"node_modules/electron-updater/node_modules/jsonfile": {
+			"version": "6.2.1",
+			"resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-6.2.1.tgz",
+			"integrity": "sha512-zwOTdL3rFQ/lRdBnntKVOX6k5cKJwEc1HdilT71BWEu7J41gXIB2MRp+vxduPSwZJPWBxEzv4yH1wYLJGUHX4Q==",
+			"license": "MIT",
+			"dependencies": {
+				"universalify": "^2.0.0"
+			},
+			"optionalDependencies": {
+				"graceful-fs": "^4.1.6"
+			}
+		},
+		"node_modules/electron-updater/node_modules/semver": {
+			"version": "7.7.4",
+			"resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
+			"integrity": "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==",
+			"license": "ISC",
+			"bin": {
+				"semver": "bin/semver.js"
+			},
+			"engines": {
+				"node": ">=10"
+			}
+		},
+		"node_modules/electron-updater/node_modules/universalify": {
+			"version": "2.0.1",
+			"resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.1.tgz",
+			"integrity": "sha512-gptHNQghINnc/vTGIk0SOFGFNXw7JVrlRUtConJRlvaw6DuX0wO5Jeko9sWrMBhh+PsYAZ7oXAiOnf/UKogyiw==",
+			"license": "MIT",
+			"engines": {
+				"node": ">= 10.0.0"
+			}
+		},
 		"node_modules/electron-winstaller": {
 			"version": "5.4.0",
 			"resolved": "https://registry.npmjs.org/electron-winstaller/-/electron-winstaller-5.4.0.tgz",
@@ -6874,7 +6935,6 @@
 			"version": "4.2.11",
 			"resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.11.tgz",
 			"integrity": "sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==",
-			"dev": true,
 			"license": "ISC"
 		},
 		"node_modules/gsap": {
@@ -7287,7 +7347,6 @@
 			"version": "4.1.1",
 			"resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.1.tgz",
 			"integrity": "sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==",
-			"dev": true,
 			"license": "MIT",
 			"dependencies": {
 				"argparse": "^2.0.1"
@@ -7419,7 +7478,6 @@
 			"version": "1.0.5",
 			"resolved": "https://registry.npmjs.org/lazy-val/-/lazy-val-1.0.5.tgz",
 			"integrity": "sha512-0/BnGCCfyUMkBpeDgWihanIAF9JmZhHBgUhEqzvf+adhNGLoP6TaiI5oF8oyb3I45P+PcnrqihSf01M0l0G5+Q==",
-			"dev": true,
 			"license": "MIT"
 		},
 		"node_modules/lilconfig": {
@@ -7586,6 +7644,19 @@
 			"dev": true,
 			"license": "MIT"
 		},
+		"node_modules/lodash.escaperegexp": {
+			"version": "4.1.2",
+			"resolved": "https://registry.npmjs.org/lodash.escaperegexp/-/lodash.escaperegexp-4.1.2.tgz",
+			"integrity": "sha512-TM9YBvyC84ZxE3rgfefxUWiQKLilstD6k7PTGt6wfbtXF8ixIJLOL3VYyV/z+ZiPLsVxAsKAFVwWlWeb2Y8Yyw==",
+			"license": "MIT"
+		},
+		"node_modules/lodash.isequal": {
+			"version": "4.5.0",
+			"resolved": "https://registry.npmjs.org/lodash.isequal/-/lodash.isequal-4.5.0.tgz",
+			"integrity": "sha512-pDo3lu8Jhfjqls6GkMgpahsF9kCyayhgykjyLMNFTKWrpVdAQtYyB4muAMWozBB4ig/dtWAmsMxLEI8wuz+DYQ==",
+			"deprecated": "This package is deprecated. Use require('node:util').isDeepStrictEqual instead.",
+			"license": "MIT"
+		},
 		"node_modules/log-update": {
 			"version": "6.1.0",
 			"resolved": "https://registry.npmjs.org/log-update/-/log-update-6.1.0.tgz",
@@ -7991,7 +8062,6 @@
 			"version": "2.1.3",
 			"resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
 			"integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-			"dev": true,
 			"license": "MIT"
 		},
 		"node_modules/mz": {
@@ -9394,7 +9464,6 @@
 			"version": "1.6.0",
 			"resolved": "https://registry.npmjs.org/sax/-/sax-1.6.0.tgz",
 			"integrity": "sha512-6R3J5M4AcbtLUdZmRv2SygeVaM7IhrLXu9BmnOGmmACak8fiUtOsYNWUS4uK7upbmHIBbLBeFeI//477BKLBzA==",
-			"dev": true,
 			"license": "BlueOak-1.0.0",
 			"engines": {
 				"node": ">=11.0.0"
@@ -10099,6 +10168,12 @@
 				"node": ">=12"
 			}
 		},
+		"node_modules/tiny-typed-emitter": {
+			"version": "2.1.0",
+			"resolved": "https://registry.npmjs.org/tiny-typed-emitter/-/tiny-typed-emitter-2.1.0.tgz",
+			"integrity": "sha512-qVtvMxeXbVej0cQWKqVSSAHmKZEHAvxdF8HEUBFWts8h+xEo5m/lEiPakuyZ3BnCBjOD8i24kzNOiOLLgsSxhA==",
+			"license": "MIT"
+		},
 		"node_modules/tinybench": {
 			"version": "2.9.0",
 			"resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",

package.json

@@ -1,7 +1,7 @@
 {
 	"name": "openscreen",
 	"private": true,
-	"version": "1.4.2",
+	"version": "1.4.12",
 	"type": "module",
 	"packageManager": "npm@10.9.4",
 	"engines": {
@@ -70,6 +70,7 @@
 		"class-variance-authority": "^0.7.1",
 		"clsx": "^2.1.1",
 		"dnd-timeline": "^2.4.0",
+		"electron-updater": "^6.8.3",
 		"emoji-picker-react": "^4.18.0",
 		"fix-webm-duration": "^1.0.6",
 		"gif.js": "^0.2.0",

scripts/build-windows-wgc-helper.mjs

@@ -131,6 +131,11 @@ if (!fs.existsSync(guideHotkeyListenerOutputPath)) {
 	throw new Error(`WGC helper build completed but ${guideHotkeyListenerOutputPath} was not found.`);
 }
 
+const ocrServiceWrapperOutputPath = path.join(BUILD_DIR, "openscreen-ocr-service-wrapper.exe");
+if (!fs.existsSync(ocrServiceWrapperOutputPath)) {
+	throw new Error(`WGC helper build completed but ${ocrServiceWrapperOutputPath} was not found.`);
+}
+
 fs.mkdirSync(BIN_DIR, { recursive: true });
 const distributablePath = path.join(BIN_DIR, "wgc-capture.exe");
 fs.copyFileSync(outputPath, distributablePath);
@@ -141,9 +146,14 @@ fs.copyFileSync(cursorSamplerOutputPath, cursorSamplerDistributablePath);
 const guideHotkeyListenerDistributablePath = path.join(BIN_DIR, "guide-hotkey-listener.exe");
 fs.copyFileSync(guideHotkeyListenerOutputPath, guideHotkeyListenerDistributablePath);
 
+const ocrServiceWrapperDistributablePath = path.join(BIN_DIR, "openscreen-ocr-service-wrapper.exe");
+fs.copyFileSync(ocrServiceWrapperOutputPath, ocrServiceWrapperDistributablePath);
+
 console.log(`Built ${outputPath}`);
 console.log(`Copied ${distributablePath}`);
 console.log(`Built ${cursorSamplerOutputPath}`);
 console.log(`Copied ${cursorSamplerDistributablePath}`);
 console.log(`Built ${guideHotkeyListenerOutputPath}`);
 console.log(`Copied ${guideHotkeyListenerDistributablePath}`);
+console.log(`Built ${ocrServiceWrapperOutputPath}`);
+console.log(`Copied ${ocrServiceWrapperDistributablePath}`);

src/App.tsx

@@ -1,4 +1,5 @@
-import { lazy, Suspense, useEffect, useState } from "react";
+import { lazy, Suspense, useEffect, useRef, useState } from "react";
+import { toast } from "sonner";
 import { CountdownOverlay } from "./components/launch/CountdownOverlay.tsx";
 import { LaunchWindow } from "./components/launch/LaunchWindow";
 import { SourceSelector } from "./components/launch/SourceSelector";
@@ -6,6 +7,7 @@ import { Toaster } from "./components/ui/sonner";
 import { TooltipProvider } from "./components/ui/tooltip";
 import { ShortcutsProvider } from "./contexts/ShortcutsContext";
 import { loadAllCustomFonts } from "./lib/customFonts";
+import type { UpdateStatus } from "./lib/updateStatus";
 
 const VideoEditor = lazy(() => import("./components/video-editor/VideoEditor"));
 const ShortcutsConfigDialog = lazy(() =>
@@ -79,11 +81,78 @@ export default function App() {
 	return (
 		<TooltipProvider>
 			{content}
+			<UpdateNotifier
+				enabled={
+					hasElectronBridge &&
+					windowType !== "hud-overlay" &&
+					windowType !== "source-selector" &&
+					windowType !== "countdown-overlay"
+				}
+			/>
 			<Toaster theme="dark" className="pointer-events-auto" />
 		</TooltipProvider>
 	);
 }
 
+function UpdateNotifier({ enabled }: { enabled: boolean }) {
+	const lastPhaseRef = useRef<UpdateStatus["phase"]>("idle");
+
+	useEffect(() => {
+		if (!enabled || !window.electronAPI?.updates) {
+			return;
+		}
+
+		const applyStatus = (status: UpdateStatus) => {
+			const version = status.version ? ` ${status.version}` : "";
+			if (status.phase === "available") {
+				toast.loading(`Downloading OpenScreen${version} update...`, {
+					id: "openscreen-update",
+					duration: Number.POSITIVE_INFINITY,
+				});
+			} else if (status.phase === "downloading") {
+				const percent = typeof status.percent === "number" ? ` ${Math.round(status.percent)}%` : "";
+				toast.loading(`Downloading OpenScreen${version} update${percent}...`, {
+					id: "openscreen-update",
+					duration: Number.POSITIVE_INFINITY,
+				});
+			} else if (status.phase === "downloaded") {
+				toast.success(`OpenScreen${version} is ready to install.`, {
+					id: "openscreen-update",
+					duration: Number.POSITIVE_INFINITY,
+					action: {
+						label: "Restart",
+						onClick: () => {
+							void window.electronAPI.updates.install();
+						},
+					},
+				});
+			} else if (
+				status.phase === "error" &&
+				(lastPhaseRef.current === "available" ||
+					lastPhaseRef.current === "downloading" ||
+					lastPhaseRef.current === "downloaded")
+			) {
+				toast.error(status.error || "OpenScreen update failed.", {
+					id: "openscreen-update",
+				});
+			} else if (status.phase === "not-available" || status.phase === "unsupported") {
+				toast.dismiss("openscreen-update");
+			}
+			lastPhaseRef.current = status.phase;
+		};
+
+		const unsubscribe = window.electronAPI.updates.onStatus(applyStatus);
+		void window.electronAPI.updates
+			.getStatus()
+			.then(applyStatus)
+			.catch(() => undefined);
+
+		return unsubscribe;
+	}, [enabled]);
+
+	return null;
+}
+
 function BrowserDevFallback() {
 	return (
 		<div className="flex h-screen w-screen items-center justify-center bg-[#08090b] px-6 text-slate-100">

src/components/launch/SourceSelector.tsx

@@ -65,7 +65,13 @@ export function SourceSelector() {
 		fetchSources();
 	}, []);
 
-	const screenSources = sources.filter((s) => s.id.startsWith("screen:"));
+	const screenSources = sources
+		.filter((s) => s.id.startsWith("screen:"))
+		.sort(
+			(left, right) =>
+				(left.displayIndex ?? left.screenIndex ?? Number.MAX_SAFE_INTEGER) -
+				(right.displayIndex ?? right.screenIndex ?? Number.MAX_SAFE_INTEGER),
+		);
 	const windowSources = sources.filter((s) => s.id.startsWith("window:"));
 
 	const handleSourceSelect = (source: DesktopSource) => setSelectedSource(source);
@@ -96,11 +102,17 @@ export function SourceSelector() {
 				onClick={() => handleSourceSelect(source)}
 			>
 				<div className="relative mb-1.5 overflow-hidden rounded-lg border border-white/[0.06] bg-black/30">
-					<img
+					{source.thumbnail ? (
-						src={source.thumbnail || ""}
+						<img
-						alt={source.name}
+							src={source.thumbnail}
-						className="w-full aspect-video object-cover"
+							alt={source.name}
-					/>
+							className="w-full aspect-video object-cover"
+						/>
+					) : (
+						<div className="flex aspect-video w-full items-center justify-center bg-zinc-950 text-center text-[11px] font-medium text-zinc-400">
+							{source.displayLabel ?? source.name}
+						</div>
+					)}
 					{isSelected && (
 						<div className="absolute right-1.5 top-1.5">
 							<div className={styles.checkBadge}>

src/components/video-editor/AnnotationOverlay.tsx

@@ -82,6 +82,7 @@ export function AnnotationOverlay({
 	);
 	const [livePointerPoint, setLivePointerPoint] = useState<{ x: number; y: number } | null>(null);
 	const mosaicCanvasRef = useRef<HTMLCanvasElement | null>(null);
+	const magnifierCanvasRef = useRef<HTMLCanvasElement | null>(null);
 	const blurType = "mosaic";
 	const blurOverlayColor =
 		annotation.type === "blur" ? getBlurOverlayColor(annotation.blurData) : "";
@@ -183,6 +184,79 @@ export function AnnotationOverlay({
 		y,
 	]);
 
+	useEffect(() => {
+		if (annotation.type !== "magnifier") {
+			return;
+		}
+		void previewFrameVersion;
+
+		const canvas = magnifierCanvasRef.current;
+		const sourceCanvas = previewSourceCanvas;
+		if (!canvas || !sourceCanvas) {
+			return;
+		}
+
+		const sourceWidth = sourceCanvas.width;
+		const sourceHeight = sourceCanvas.height;
+		const sourceClientWidth = sourceCanvas.clientWidth || containerWidth || sourceWidth;
+		const sourceClientHeight = sourceCanvas.clientHeight || containerHeight || sourceHeight;
+		if (
+			sourceWidth <= 0 ||
+			sourceHeight <= 0 ||
+			sourceClientWidth <= 0 ||
+			sourceClientHeight <= 0
+		) {
+			return;
+		}
+
+		const drawWidth = Math.max(1, Math.round(width));
+		const drawHeight = Math.max(1, Math.round(height));
+		canvas.width = drawWidth;
+		canvas.height = drawHeight;
+
+		const context = canvas.getContext("2d");
+		if (!context) {
+			return;
+		}
+
+		const zoom = Math.max(1, annotation.magnifierData?.zoom ?? 2.2);
+		const target = annotation.magnifierData?.target ?? {
+			x: annotation.position.x + annotation.size.width / 2,
+			y: annotation.position.y + annotation.size.height / 2,
+		};
+		const scaleX = sourceWidth / sourceClientWidth;
+		const scaleY = sourceHeight / sourceClientHeight;
+		const targetX = (target.x / 100) * sourceClientWidth * scaleX;
+		const targetY = (target.y / 100) * sourceClientHeight * scaleY;
+		const sampleWidth = Math.max(1, drawWidth / zoom);
+		const sampleHeight = Math.max(1, drawHeight / zoom);
+		const sx = Math.max(0, Math.min(sourceWidth - sampleWidth, targetX - sampleWidth / 2));
+		const sy = Math.max(0, Math.min(sourceHeight - sampleHeight, targetY - sampleHeight / 2));
+
+		context.clearRect(0, 0, drawWidth, drawHeight);
+		context.imageSmoothingEnabled = true;
+		context.imageSmoothingQuality = "high";
+		context.drawImage(
+			sourceCanvas as CanvasImageSource,
+			sx,
+			sy,
+			Math.min(sampleWidth, sourceWidth - sx),
+			Math.min(sampleHeight, sourceHeight - sy),
+			0,
+			0,
+			drawWidth,
+			drawHeight,
+		);
+	}, [
+		annotation,
+		containerHeight,
+		containerWidth,
+		height,
+		previewFrameVersion,
+		previewSourceCanvas,
+		width,
+	]);
+
 	const renderArrow = () => {
 		const direction = annotation.figureData?.arrowDirection || "right";
 		const color = annotation.figureData?.color || "#34B27B";
@@ -351,6 +425,30 @@ export function AnnotationOverlay({
 					<div className="w-full h-full flex items-center justify-center p-2">{renderArrow()}</div>
 				);
 
+			case "magnifier": {
+				const shape = annotation.magnifierData?.shape ?? "circle";
+				const caption = annotation.magnifierData?.caption;
+				return (
+					<div className="relative h-full w-full">
+						<canvas
+							ref={magnifierCanvasRef}
+							className="absolute inset-0 h-full w-full"
+							style={{
+								borderRadius: shape === "circle" ? "9999px" : "10px",
+								border: "3px solid rgba(248,250,252,0.96)",
+								boxShadow: "0 14px 36px rgba(0,0,0,0.38), 0 0 0 1px rgba(52,178,123,0.55)",
+								backgroundColor: "rgba(15, 23, 42, 0.9)",
+							}}
+						/>
+						{caption && (
+							<div className="absolute left-1/2 top-full mt-1 max-w-[220px] -translate-x-1/2 rounded-md bg-slate-950/90 px-2 py-1 text-center text-[11px] font-semibold leading-4 text-slate-100 shadow-lg">
+								{caption}
+							</div>
+						)}
+					</div>
+				);
+			}
+
 			case "blur": {
 				const shape = annotation.blurData?.shape ?? "rectangle";
 				const blurIntensity = Math.max(
@@ -623,6 +721,7 @@ export function AnnotationOverlay({
 					annotation.type === "text" && "bg-transparent",
 					annotation.type === "image" && "bg-transparent",
 					annotation.type === "figure" && "bg-transparent",
+					annotation.type === "magnifier" && "bg-transparent",
 					annotation.type === "blur" && "bg-transparent",
 					isSelected && annotation.type !== "blur" && "shadow-lg",
 				)}

src/components/video-editor/VideoEditor.tsx

@@ -13,6 +13,8 @@ import {
 } from "@/components/ui/dialog";
 import { useI18n, useScopedT } from "@/contexts/I18nContext";
 import { useShortcuts } from "@/contexts/ShortcutsContext";
+import type { GuideSession } from "@/guide/contracts";
+import { buildGuideVideoAnnotations, buildGuideVideoSpeedRegions } from "@/guide/videoAnnotations";
 import { INITIAL_EDITOR_STATE, useEditorHistory } from "@/hooks/useEditorHistory";
 import { type Locale } from "@/i18n/config";
 import { getAvailableLocales, getLocaleName } from "@/i18n/loader";
@@ -1374,6 +1376,34 @@ export default function VideoEditor() {
 		[pushState],
 	);
 
+	const handleGuideAttachToVideo = useCallback(
+		(session: GuideSession) => {
+			const guideAnnotations = buildGuideVideoAnnotations(session, {
+				nextId: () => `annotation-${nextAnnotationIdRef.current++}`,
+				nextZIndex: () => nextAnnotationZIndexRef.current++,
+			});
+			const guideSpeedRegions = buildGuideVideoSpeedRegions(session, {
+				nextId: () => `speed-${nextSpeedIdRef.current++}`,
+			});
+			if (guideAnnotations.length === 0 && guideSpeedRegions.length === 0) {
+				toast.error("Generate a guide draft before attaching steps to the video.");
+				return;
+			}
+
+			pushState((prev) => ({
+				annotationRegions: [...prev.annotationRegions, ...guideAnnotations],
+				speedRegions: [...prev.speedRegions, ...guideSpeedRegions],
+			}));
+			const firstTextAnnotation = guideAnnotations.find((annotation) => annotation.type === "text");
+			setSelectedAnnotationId(firstTextAnnotation?.id ?? guideAnnotations[0]?.id ?? null);
+			setSelectedBlurId(null);
+			setSelectedZoomId(null);
+			setSelectedTrimId(null);
+			setSelectedSpeedId(null);
+		},
+		[pushState],
+	);
+
 	useEffect(() => {
 		const handleKeyDown = (e: KeyboardEvent) => {
 			const mod = e.ctrlKey || e.metaKey;
@@ -2162,6 +2192,7 @@ export default function VideoEditor() {
 										videoPath={videoPath}
 										videoSourcePath={videoSourcePath}
 										currentTimeMs={currentTime * 1000}
+										onAttachToVideo={handleGuideAttachToVideo}
 									/>
 								)}
 								<div className="min-h-0 flex-1 overflow-hidden">

src/components/video-editor/VideoPlayback.tsx

@@ -1963,18 +1963,20 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 										region: blurRegion,
 									})),
 								].sort((a, b) => a.region.zIndex - b.region.zIndex);
-								const previewSnapshotCanvas =
+								const needsPreviewSnapshot =
-									filteredBlurRegions.length > 0
+									filteredBlurRegions.length > 0 ||
-										? (() => {
+									filteredAnnotations.some((annotation) => annotation.type === "magnifier");
-												const app = appRef.current;
+								const previewSnapshotCanvas = needsPreviewSnapshot
-												if (!app?.renderer?.extract) return null;
+									? (() => {
-												try {
+											const app = appRef.current;
-													return app.renderer.extract.canvas(app.stage);
+											if (!app?.renderer?.extract) return null;
-												} catch {
+											try {
-													return null;
+												return app.renderer.extract.canvas(app.stage);
-												}
+											} catch {
-											})()
+												return null;
-										: null;
+											}
+										})()
+									: null;
 
 								// Handle click-through cycling: when clicking same annotation, cycle to next
 								const handleAnnotationClick = (clickedId: string) => {

src/components/video-editor/guide/GuidePanel.tsx

@@ -1,4 +1,4 @@
-import { KeyRound, ListChecks, RefreshCw, Save, Trash2, Wand2 } from "lucide-react";
+import { KeyRound, ListChecks, RefreshCw, Save, Trash2, Video, Wand2 } from "lucide-react";
 import { useCallback, useEffect, useMemo, useState } from "react";
 import { toast } from "sonner";
 import { Button } from "@/components/ui/button";
@@ -7,7 +7,9 @@ import type {
 	GuideAiProvider,
 	GuideAiSettings,
 	GuideLanguage,
+	GuideOcrProfile,
 	GuideSession,
+	GuideSnapshot,
 } from "@/guide/contracts";
 import { captureGuideSnapshots } from "@/guide/snapshot/extractGuideSnapshots";
 
@@ -16,9 +18,17 @@ interface GuidePanelProps {
 	videoPath: string | null;
 	videoSourcePath: string | null;
 	currentTimeMs: number;
+	onAttachToVideo?: (session: GuideSession) => void;
 }
 
-type BusyAction = "load" | "generate";
+type BusyAction = "load" | "generate" | "attach";
+
+interface GuideProgressState {
+	label: string;
+	current: number;
+	total: number;
+	detail?: string;
+}
 
 const COPY = {
 	en: {
@@ -42,13 +52,19 @@ const COPY = {
 		captureStep: "Capture step",
 		captureLabel: "Manual capture",
 		settings: "Settings",
+		guideSettings: "Guide settings",
 		apiKey: "API key env",
 		apiKeyPlaceholder: "DEEPSEEK_API_KEY",
 		baseUrl: "Base URL",
 		model: "Model",
+		ocrProfile: "OCR profile",
+		ocrLanguage: "OCR languages",
+		ocrFast: "Fast Latin",
+		ocrVietnamese: "Vietnamese Enhanced",
+		ocrHybrid: "Hybrid Vi + Latin",
 		saveSettings: "Save",
 		clearKey: "Reset env",
-		keySaved: "DeepSeek settings saved.",
+		settingsSaved: "Guide settings saved.",
 		keyMissing: "Set a DeepSeek API key environment variable before generating with DeepSeek.",
 		keyConfigured: "Env ready",
 		keyNotConfigured: "Env value missing",
@@ -56,6 +72,14 @@ const COPY = {
 		noEvents: "No click events were captured for this guide.",
 		ocrUnavailable: "Local OCR service is unavailable. You can still create a local draft.",
 		exported: "Guide exported",
+		attachToVideo: "Attach to video",
+		attachedToVideo: "Guide steps attached to the video timeline.",
+		noDraft: "Generate a guide draft before attaching steps to the video.",
+		progressPreparing: "Preparing events",
+		progressSnapshots: "Capturing snapshots",
+		progressOcr: "Running OCR",
+		progressDraft: "Writing draft",
+		progressExport: "Exporting files",
 	},
 	vi: {
 		title: "Hướng dẫn",
@@ -78,13 +102,19 @@ const COPY = {
 		captureStep: "Chụp bước",
 		captureLabel: "Chụp thủ công",
 		settings: "Cài đặt",
+		guideSettings: "Guide settings",
 		apiKey: "API key env",
 		apiKeyPlaceholder: "DEEPSEEK_API_KEY",
 		baseUrl: "Base URL",
 		model: "Model",
+		ocrProfile: "OCR profile",
+		ocrLanguage: "OCR languages",
+		ocrFast: "Fast Latin",
+		ocrVietnamese: "Vietnamese Enhanced",
+		ocrHybrid: "Hybrid Vi + Latin",
 		saveSettings: "Lưu",
 		clearKey: "Reset env",
-		keySaved: "Đã lưu cài đặt DeepSeek.",
+		settingsSaved: "Da luu cai dat guide.",
 		keyMissing: "Hãy set biến môi trường DeepSeek API key trước khi tạo draft bằng DeepSeek.",
 		keyConfigured: "Env ready",
 		keyNotConfigured: "Chưa thấy giá trị env",
@@ -92,10 +122,41 @@ const COPY = {
 		noEvents: "Chưa ghi nhận click event nào cho guide này.",
 		ocrUnavailable: "OCR local chưa chạy. Vẫn có thể tạo draft local.",
 		exported: "Đã export hướng dẫn",
+		attachToVideo: "Gắn vào video",
+		attachedToVideo: "Đã gắn các bước guide vào timeline video.",
+		noDraft: "Hãy tạo draft guide trước khi gắn vào video.",
+		progressPreparing: "Đang chuẩn bị events",
+		progressSnapshots: "Đang chụp ảnh",
+		progressOcr: "Đang OCR",
+		progressDraft: "Đang tạo draft",
+		progressExport: "Đang export file",
 	},
 } as const;
 
-export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePanelProps) {
+function getPendingOcrSnapshots(session: GuideSession): GuideSnapshot[] {
+	const ocrCompletedSnapshotIds = new Set(session.ocrBlocks.map((block) => block.snapshotId));
+	return session.snapshots.filter(
+		(snapshot) => !snapshot.ocrCompletedAt && !ocrCompletedSnapshotIds.has(snapshot.id),
+	);
+}
+
+function getProgressPercent(progress: GuideProgressState | null): number {
+	if (!progress) {
+		return 0;
+	}
+	if (progress.total <= 0) {
+		return 100;
+	}
+	const percent = Math.round((progress.current / progress.total) * 100);
+	return Math.min(100, Math.max(progress.current > 0 ? 8 : 4, percent));
+}
+
+export function GuidePanel({
+	recordingId,
+	videoPath,
+	videoSourcePath,
+	onAttachToVideo,
+}: GuidePanelProps) {
 	const { locale } = useI18n();
 	const copy = useMemo(() => (locale.startsWith("vi") ? COPY.vi : COPY.en), [locale]);
 	const guideLanguage: GuideLanguage = locale.startsWith("vi") ? "vi" : "en";
@@ -108,9 +169,13 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 	const [deepSeekApiKeyEnvName, setDeepSeekApiKeyEnvName] = useState("DEEPSEEK_API_KEY");
 	const [deepSeekBaseUrl, setDeepSeekBaseUrl] = useState("https://api.deepseek.com");
 	const [deepSeekModel, setDeepSeekModel] = useState("deepseek-chat");
+	const [ocrProfile, setOcrProfile] = useState<GuideOcrProfile>("vietnamese");
+	const [ocrLanguage, setOcrLanguage] = useState("vi,en");
 	const [message, setMessage] = useState<string | null>(null);
+	const [progress, setProgress] = useState<GuideProgressState | null>(null);
 
 	const isBusy = busyAction !== null;
+	const progressPercent = getProgressPercent(progress);
 	const canUseGuide = Boolean(recordingId && videoSourcePath && window.electronAPI?.guide);
 	const generatedSteps = session?.generatedGuide?.steps ?? [];
 	const statusLabel = useMemo(() => {
@@ -138,6 +203,8 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 		setDeepSeekBaseUrl(result.data.deepseek.baseUrl);
 		setDeepSeekModel(result.data.deepseek.model);
 		setDeepSeekApiKeyEnvName(result.data.deepseek.apiKeyEnvName);
+		setOcrProfile(result.data.ocr.profile);
+		setOcrLanguage(result.data.ocr.language);
 	}, []);
 
 	useEffect(() => {
@@ -203,6 +270,15 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 		}
 
 		let current = session;
+		const readResult = await window.electronAPI.guide.readSession(recordingId);
+		if (readResult.success) {
+			current = readResult.data;
+		} else if (readResult.code === "guide-session-not-found") {
+			current = null;
+		} else if (!current) {
+			throw new Error(readResult.error);
+		}
+
 		if (!current) {
 			const startResult = await window.electronAPI.guide.startSession(recordingId);
 			if (!startResult.success) {
@@ -234,6 +310,7 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 			}
 			setBusyAction(action);
 			setMessage(null);
+			setProgress(null);
 			try {
 				await task();
 			} catch (error) {
@@ -269,6 +346,8 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 				deepseekApiKeyEnvName: deepSeekApiKeyEnvName,
 				baseUrl: deepSeekBaseUrl,
 				model: deepSeekModel,
+				ocrProfile,
+				ocrLanguage,
 			});
 			if (!result.success) {
 				throw new Error(result.error);
@@ -277,7 +356,9 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 			setDeepSeekApiKeyEnvName(result.data.deepseek.apiKeyEnvName);
 			setDeepSeekBaseUrl(result.data.deepseek.baseUrl);
 			setDeepSeekModel(result.data.deepseek.model);
-			toast.success(copy.keySaved);
+			setOcrProfile(result.data.ocr.profile);
+			setOcrLanguage(result.data.ocr.language);
+			toast.success(copy.settingsSaved);
 		} catch (error) {
 			const text = error instanceof Error ? error.message : String(error);
 			setMessage(text);
@@ -285,7 +366,14 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 		} finally {
 			setSettingsBusy(false);
 		}
-	}, [copy.keySaved, deepSeekApiKeyEnvName, deepSeekBaseUrl, deepSeekModel]);
+	}, [
+		copy.settingsSaved,
+		deepSeekApiKeyEnvName,
+		deepSeekBaseUrl,
+		deepSeekModel,
+		ocrLanguage,
+		ocrProfile,
+	]);
 
 	const handleClearDeepSeekKey = useCallback(async () => {
 		if (!window.electronAPI?.guide?.saveAiSettings) {
@@ -298,13 +386,17 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 				clearDeepseekApiKeyEnvName: true,
 				baseUrl: deepSeekBaseUrl,
 				model: deepSeekModel,
+				ocrProfile,
+				ocrLanguage,
 			});
 			if (!result.success) {
 				throw new Error(result.error);
 			}
 			setAiSettings(result.data);
 			setDeepSeekApiKeyEnvName(result.data.deepseek.apiKeyEnvName);
-			toast.success(copy.keySaved);
+			setOcrProfile(result.data.ocr.profile);
+			setOcrLanguage(result.data.ocr.language);
+			toast.success(copy.settingsSaved);
 		} catch (error) {
 			const text = error instanceof Error ? error.message : String(error);
 			setMessage(text);
@@ -312,7 +404,7 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 		} finally {
 			setSettingsBusy(false);
 		}
-	}, [copy.keySaved, deepSeekBaseUrl, deepSeekModel]);
+	}, [copy.settingsSaved, deepSeekBaseUrl, deepSeekModel, ocrLanguage, ocrProfile]);
 
 	const handleGenerateGuide = useCallback(() => {
 		void runAction("generate", async () => {
@@ -323,21 +415,59 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 			if (!videoPath) {
 				throw new Error("Video URL is not available.");
 			}
+			setProgress({
+				label: copy.progressPreparing,
+				current: 0,
+				total: 1,
+				detail: "0/1",
+			});
 			let current = await ensureEventsSession();
+			setProgress({
+				label: copy.progressPreparing,
+				current: 1,
+				total: 1,
+				detail: "1/1",
+			});
 			if (current.events.length === 0) {
 				throw new Error(copy.noEvents);
 			}
-			if (current.snapshots.length < current.events.length) {
+			const snapshotEventIds = new Set(current.snapshots.map((snapshot) => snapshot.eventId));
+			const pendingSnapshotTotal = current.events.filter(
+				(event) => !snapshotEventIds.has(event.id),
+			).length;
+			if (pendingSnapshotTotal > 0) {
+				setProgress({
+					label: copy.progressSnapshots,
+					current: 0,
+					total: pendingSnapshotTotal,
+					detail: `0/${pendingSnapshotTotal}`,
+				});
 				current = await captureGuideSnapshots({
 					session: current,
 					videoUrl: videoPath,
 					maxWidth: 1280,
+					onProgress: ({ completed, total }) => {
+						setProgress({
+							label: copy.progressSnapshots,
+							current: completed,
+							total,
+							detail: `${completed}/${total}`,
+						});
+					},
 				});
 				setSession(current);
 			}
-			if (current.ocrBlocks.length === 0 && current.snapshots.length > 0) {
+			const pendingOcrSnapshots = getPendingOcrSnapshots(current);
+			for (const [index, snapshot] of pendingOcrSnapshots.entries()) {
+				setProgress({
+					label: copy.progressOcr,
+					current: index,
+					total: pendingOcrSnapshots.length,
+					detail: `${index + 1}/${pendingOcrSnapshots.length}`,
+				});
 				const ocrResult = await window.electronAPI.guide.runOcr({
 					recordingId: current.recordingId,
+					snapshotIds: [snapshot.id],
 				});
 				if (!ocrResult.success) {
 					if (ocrResult.code === "guide-ocr-unavailable") {
@@ -347,7 +477,19 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 				}
 				current = ocrResult.data;
 				setSession(current);
+				setProgress({
+					label: copy.progressOcr,
+					current: index + 1,
+					total: pendingOcrSnapshots.length,
+					detail: `${index + 1}/${pendingOcrSnapshots.length}`,
+				});
 			}
+			setProgress({
+				label: copy.progressDraft,
+				current: 0,
+				total: 1,
+				detail: "0/1",
+			});
 			const result = await window.electronAPI.guide.generateDraft({
 				recordingId: current.recordingId,
 				language: guideLanguage,
@@ -356,18 +498,44 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 			if (!result.success) {
 				throw new Error(result.error);
 			}
+			current = result.data;
+			setSession(current);
+			setProgress({
+				label: copy.progressDraft,
+				current: 1,
+				total: 1,
+				detail: "1/1",
+			});
+			setProgress({
+				label: copy.progressExport,
+				current: 0,
+				total: 2,
+				detail: "0/2",
+			});
 			const markdownResult = await window.electronAPI.guide.exportMarkdown({
 				recordingId: current.recordingId,
 			});
 			if (!markdownResult.success) {
 				throw new Error(markdownResult.error);
 			}
+			setProgress({
+				label: copy.progressExport,
+				current: 1,
+				total: 2,
+				detail: "1/2",
+			});
 			const htmlResult = await window.electronAPI.guide.exportHtml({
 				recordingId: current.recordingId,
 			});
 			if (!htmlResult.success) {
 				throw new Error(htmlResult.error);
 			}
+			setProgress({
+				label: copy.progressExport,
+				current: 2,
+				total: 2,
+				detail: "2/2",
+			});
 			const revealResult = await window.electronAPI.revealInFolder(htmlResult.data.path);
 			if (!revealResult.success) {
 				toast.warning(revealResult.error ?? "Unable to open guide folder.");
@@ -383,6 +551,11 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 		copy.keyMissing,
 		copy.noEvents,
 		copy.ocrUnavailable,
+		copy.progressDraft,
+		copy.progressExport,
+		copy.progressOcr,
+		copy.progressPreparing,
+		copy.progressSnapshots,
 		ensureEventsSession,
 		guideLanguage,
 		provider,
@@ -390,6 +563,25 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 		videoPath,
 	]);
 
+	const handleAttachToVideo = useCallback(() => {
+		if (!session?.generatedGuide || session.generatedGuide.steps.length === 0) {
+			setMessage(copy.noDraft);
+			toast.error(copy.noDraft);
+			return;
+		}
+		if (!onAttachToVideo) {
+			return;
+		}
+		setBusyAction("attach");
+		try {
+			onAttachToVideo(session);
+			setMessage(null);
+			toast.success(copy.attachedToVideo);
+		} finally {
+			setBusyAction(null);
+		}
+	}, [copy.attachedToVideo, copy.noDraft, onAttachToVideo, session]);
+
 	return (
 		<section className="editor-inspector-shell flex max-h-[320px] min-h-[246px] shrink-0 flex-col overflow-hidden rounded-[18px] border border-white/[0.075] bg-[#090a0c]">
 			<div className="flex items-center justify-between border-b border-white/[0.07] px-3 py-2">
@@ -413,6 +605,24 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 					{canUseGuide ? statusLabel : copy.noRecording}
 				</p>
 				{message && <p className="mb-2 text-[11px] leading-4 text-amber-300">{message}</p>}
+				{progress && (
+					<div className="mb-2 rounded-md border border-white/[0.07] bg-white/[0.035] px-2 py-1.5">
+						<div className="mb-1 flex items-center justify-between gap-2 text-[10px] leading-4">
+							<span className="min-w-0 truncate font-semibold text-slate-200">
+								{progress.label}
+							</span>
+							<span className="shrink-0 text-slate-500">
+								{progress.detail ?? `${progress.current}/${progress.total}`}
+							</span>
+						</div>
+						<div className="h-1.5 overflow-hidden rounded-full bg-white/[0.06]">
+							<div
+								className="h-full rounded-full bg-[#34B27B] transition-all duration-200"
+								style={{ width: `${progressPercent}%` }}
+							/>
+						</div>
+					</div>
+				)}
 
 				<div className="mb-2 flex items-center gap-1.5">
 					<select
@@ -450,12 +660,22 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 					</span>
 				</button>
 
+				<button
+					type="button"
+					disabled={!generatedSteps.length || isBusy || !onAttachToVideo}
+					onClick={handleAttachToVideo}
+					className="mb-2 flex h-9 w-full items-center justify-center gap-2 rounded-md border border-sky-400/25 bg-sky-400/10 px-3 text-xs font-semibold text-sky-100 transition-all hover:border-sky-300/45 hover:bg-sky-400/18 disabled:cursor-not-allowed disabled:opacity-40"
+				>
+					<Video className="h-3.5 w-3.5 shrink-0" />
+					<span className="truncate">{copy.attachToVideo}</span>
+				</button>
+
 				{settingsOpen && (
 					<div className="mb-2 space-y-2 rounded-md border border-white/[0.07] bg-white/[0.035] p-2">
 						<div className="flex items-center justify-between gap-2">
 							<div className="min-w-0">
 								<div className="truncate text-[11px] font-semibold text-slate-100">
-									{copy.deepseek} {copy.settings}
+									{copy.guideSettings}
 								</div>
 								<div className="truncate text-[10px] text-slate-500">
 									{aiSettings?.deepseek.hasApiKey
@@ -470,6 +690,33 @@ export function GuidePanel({ recordingId, videoPath, videoSourcePath }: GuidePan
 							</span>
 						</div>
 
+						<div className="grid grid-cols-2 gap-1.5">
+							<label className="block min-w-0 text-[10px] font-medium text-slate-400">
+								{copy.ocrProfile}
+								<select
+									value={ocrProfile}
+									onChange={(event) => setOcrProfile(event.target.value as GuideOcrProfile)}
+									disabled={settingsBusy}
+									className="mt-1 h-8 w-full rounded-md border border-white/[0.08] bg-black/20 px-2 text-[11px] text-slate-100 outline-none"
+								>
+									<option value="vietnamese">{copy.ocrVietnamese}</option>
+									<option value="hybrid">{copy.ocrHybrid}</option>
+									<option value="fast">{copy.ocrFast}</option>
+								</select>
+							</label>
+							<label className="block min-w-0 text-[10px] font-medium text-slate-400">
+								{copy.ocrLanguage}
+								<input
+									type="text"
+									value={ocrLanguage}
+									onChange={(event) => setOcrLanguage(event.target.value)}
+									placeholder="vi,en"
+									disabled={settingsBusy}
+									className="mt-1 h-8 w-full rounded-md border border-white/[0.08] bg-black/20 px-2 text-[11px] text-slate-100 outline-none placeholder:text-slate-600"
+								/>
+							</label>
+						</div>
+
 						<label className="block text-[10px] font-medium text-slate-400">
 							{copy.apiKey}
 							<input

src/components/video-editor/projectPersistence.ts

@@ -23,6 +23,7 @@ import {
 	DEFAULT_BLUR_FREEHAND_POINTS,
 	DEFAULT_BLUR_INTENSITY,
 	DEFAULT_FIGURE_DATA,
+	DEFAULT_MAGNIFIER_DATA,
 	DEFAULT_PLAYBACK_SPEED,
 	DEFAULT_ZOOM_DEPTH,
 	DEFAULT_ZOOM_MOTION_BLUR,
@@ -325,7 +326,10 @@ export function normalizeProjectEditor(editor: Partial<ProjectEditorState>): Pro
 						startMs,
 						endMs,
 						type:
-							region.type === "image" || region.type === "figure" || region.type === "blur"
+							region.type === "image" ||
+							region.type === "figure" ||
+							region.type === "blur" ||
+							region.type === "magnifier"
 								? region.type
 								: "text",
 						content: typeof region.content === "string" ? region.content : "",
@@ -410,6 +414,45 @@ export function normalizeProjectEditor(editor: Partial<ProjectEditorState>): Pro
 											: DEFAULT_BLUR_FREEHAND_POINTS,
 									}
 								: undefined,
+						magnifierData:
+							region.magnifierData && typeof region.magnifierData === "object"
+								? {
+										...DEFAULT_MAGNIFIER_DATA,
+										...region.magnifierData,
+										target: {
+											x: clamp(
+												isFiniteNumber(region.magnifierData.target?.x)
+													? region.magnifierData.target.x
+													: DEFAULT_MAGNIFIER_DATA.target.x,
+												0,
+												100,
+											),
+											y: clamp(
+												isFiniteNumber(region.magnifierData.target?.y)
+													? region.magnifierData.target.y
+													: DEFAULT_MAGNIFIER_DATA.target.y,
+												0,
+												100,
+											),
+										},
+										zoom: clamp(
+											isFiniteNumber(region.magnifierData.zoom)
+												? region.magnifierData.zoom
+												: DEFAULT_MAGNIFIER_DATA.zoom,
+											1,
+											6,
+										),
+										shape:
+											region.magnifierData.shape === "rounded" ||
+											region.magnifierData.shape === "circle"
+												? region.magnifierData.shape
+												: DEFAULT_MAGNIFIER_DATA.shape,
+										caption:
+											typeof region.magnifierData.caption === "string"
+												? region.magnifierData.caption
+												: undefined,
+									}
+								: undefined,
 					};
 				})
 		: [];

src/components/video-editor/types.ts

@@ -206,7 +206,7 @@ export interface TrimRegion {
 	endMs: number;
 }
 
-export type AnnotationType = "text" | "image" | "figure" | "blur";
+export type AnnotationType = "text" | "image" | "figure" | "blur" | "magnifier";
 
 export type ArrowDirection =
 	| "up"
@@ -245,6 +245,13 @@ export interface BlurData {
 	freehandPoints?: Array<{ x: number; y: number }>;
 }
 
+export interface MagnifierData {
+	target: AnnotationPosition;
+	zoom: number;
+	shape: "circle" | "rounded";
+	caption?: string;
+}
+
 export interface AnnotationPosition {
 	x: number;
 	y: number;
@@ -280,6 +287,7 @@ export interface AnnotationRegion {
 	zIndex: number;
 	figureData?: FigureData;
 	blurData?: BlurData;
+	magnifierData?: MagnifierData;
 }
 
 export const DEFAULT_ANNOTATION_POSITION: AnnotationPosition = {
@@ -330,6 +338,12 @@ export const DEFAULT_BLUR_DATA: BlurData = {
 	freehandPoints: DEFAULT_BLUR_FREEHAND_POINTS,
 };
 
+export const DEFAULT_MAGNIFIER_DATA: MagnifierData = {
+	target: { x: 50, y: 50 },
+	zoom: 2.2,
+	shape: "circle",
+};
+
 export interface CropRegion {
 	x: number;
 	y: number;

src/guide/contracts.ts

@@ -9,6 +9,7 @@ export type GuideTargetRole = "button" | "menu" | "tab" | "field" | "link" | "un
 export type GuideLanguage = "vi" | "en";
 export type GuideAiProvider = "deepseek" | "local";
 export type GuideSecretStorage = "environment" | "none";
+export type GuideOcrProfile = "fast" | "vietnamese" | "hybrid";
 
 export type GuideSessionStatus =
 	| "recording"
@@ -54,6 +55,8 @@ export interface GuideSnapshot {
 	timeMs: number;
 	offsetMs: number;
 	path: string;
+	markedPath?: string;
+	ocrCompletedAt?: string;
 	width: number;
 	height: number;
 }
@@ -162,6 +165,7 @@ export interface WriteGuideSnapshotInput {
 	timeMs: number;
 	offsetMs: number;
 	pngBytes: ArrayBuffer;
+	markedPngBytes?: ArrayBuffer;
 	width: number;
 	height: number;
 }
@@ -178,6 +182,11 @@ export interface GenerateGuideDraftInput {
 }
 
 export interface GuideAiSettings {
+	ocr: {
+		profile: GuideOcrProfile;
+		language: string;
+		updatedAt?: string;
+	};
 	deepseek: {
 		hasApiKey: boolean;
 		apiKeyEnvName: string;
@@ -194,6 +203,8 @@ export interface SaveGuideAiSettingsInput {
 	clearDeepseekApiKeyEnvName?: boolean;
 	baseUrl?: string;
 	model?: string;
+	ocrProfile?: GuideOcrProfile;
+	ocrLanguage?: string;
 }
 
 export interface SaveGuideInput {

src/guide/exporters.test.ts

@@ -29,6 +29,7 @@ const session: GuideSession = {
 			timeMs: 1500,
 			offsetMs: 500,
 			path: "/tmp/recording-guide/step-001.png",
+			markedPath: "/tmp/recording-guide/step-001-marked.png",
 			width: 1280,
 			height: 720,
 		},
@@ -71,7 +72,7 @@ describe("guide exporters", () => {
 
 		expect(markdown).toContain("# User guide");
 		expect(markdown).toContain("## 1. Open Settings");
-		expect(markdown).toContain("](step-001.png)");
+		expect(markdown).toContain("](step-001-marked.png)");
 	});
 
 	it("exports escaped HTML", () => {
@@ -79,12 +80,11 @@ describe("guide exporters", () => {
 
 		expect(html).toContain("<!doctype html>");
 		expect(html).toContain("<h1>User guide</h1>");
-		expect(html).toContain('src="step-001.png"');
+		expect(html).toContain('src="step-001-marked.png"');
-		expect(html).toContain("click-marker");
+		expect(html).not.toContain("click-marker");
-		expect(html).toContain("left: 25.00%; top: 75.00%;");
 	});
 
-	it("draws click markers for hotkey events with coordinates", () => {
+	it("uses marker snapshots for hotkey events with coordinates", () => {
 		const hotkeySession: GuideSession = {
 			...session,
 			events: [
@@ -98,7 +98,21 @@ describe("guide exporters", () => {
 
 		const html = exportGuideToHtml(hotkeySession);
 
-		expect(html).toContain("click-marker");
+		expect(html).toContain('src="step-001-marked.png"');
-		expect(html).toContain("left: 25.00%; top: 75.00%;");
+		expect(html).not.toContain("click-marker");
+	});
+
+	it("falls back to the unmarked screenshot when no marker snapshot exists", () => {
+		const unmarkedSession: GuideSession = {
+			...session,
+			snapshots: session.snapshots.map((snapshot) => ({
+				...snapshot,
+				markedPath: undefined,
+			})),
+		};
+
+		const markdown = exportGuideToMarkdown(unmarkedSession);
+
+		expect(markdown).toContain("](step-001.png)");
 	});
 });

src/guide/exporters.ts

@@ -10,8 +10,9 @@ export function exportGuideToMarkdown(session: GuideSession): string {
 
 	for (const step of guide.steps) {
 		lines.push(`## ${step.order}. ${step.title}`, "", step.instruction, "");
-		if (step.screenshotPath) {
+		const screenshotPath = resolveStepScreenshotPath(step, session);
-			lines.push(`![${escapeMarkdownAlt(step.title)}](${path.basename(step.screenshotPath)})`, "");
+		if (screenshotPath) {
+			lines.push(`![${escapeMarkdownAlt(step.title)}](${path.basename(screenshotPath)})`, "");
 		}
 	}
 
@@ -36,10 +37,8 @@ export function exportGuideToHtml(session: GuideSession): string {
     .step { border-top: 1px solid #e5e7eb; padding: 22px 0; }
     .step h2 { font-size: 18px; margin: 0 0 8px; }
     .step p { margin: 0 0 12px; }
-    .shot { display: inline-block; position: relative; max-width: 100%; margin: 0; }
+    .shot { display: inline-block; max-width: 100%; margin: 0; }
     img { display: block; max-width: 100%; border: 1px solid #e5e7eb; border-radius: 6px; }
-    .click-marker { position: absolute; width: 26px; height: 26px; border: 3px solid #ef4444; border-radius: 999px; box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.18), 0 2px 8px rgba(17, 24, 39, 0.28); transform: translate(-50%, -50%); pointer-events: none; }
-    .click-marker::after { content: ""; position: absolute; left: 50%; top: 50%; width: 6px; height: 6px; border-radius: 999px; background: #ef4444; transform: translate(-50%, -50%); }
   </style>
 </head>
 <body>
@@ -54,12 +53,9 @@ export function exportGuideToHtml(session: GuideSession): string {
 }
 
 function renderStepHtml(step: GeneratedGuideStep, session: GuideSession): string {
-	const clickPoint = resolveStepClickPoint(step, session);
+	const screenshotPath = resolveStepScreenshotPath(step, session);
-	const marker = clickPoint
+	const image = screenshotPath
-		? `<span class="click-marker" style="left: ${formatPercent(clickPoint.x)}%; top: ${formatPercent(clickPoint.y)}%;" aria-label="Click position"></span>`
+		? `<figure class="shot"><img src="${escapeHtml(path.basename(screenshotPath))}" alt="${escapeHtml(step.title)}"></figure>`
-		: "";
-	const image = step.screenshotPath
-		? `<figure class="shot"><img src="${escapeHtml(path.basename(step.screenshotPath))}" alt="${escapeHtml(step.title)}">${marker}</figure>`
 		: "";
 	return `<section class="step">
   <h2>${step.order}. ${escapeHtml(step.title)}</h2>
@@ -88,54 +84,32 @@ function escapeHtml(value: string): string {
 		.replace(/'/g, "&#39;");
 }
 
-function resolveStepClickPoint(
+function resolveStepScreenshotPath(
 	step: GeneratedGuideStep,
 	session: GuideSession,
-): { x: number; y: number } | null {
+): string | undefined {
+	const snapshot = resolveStepSnapshot(step, session);
+	return snapshot?.markedPath ?? step.screenshotPath ?? snapshot?.path;
+}
+
+function resolveStepSnapshot(step: GeneratedGuideStep, session: GuideSession) {
 	const candidate = step.sourceCandidateId
 		? session.candidates.find((item) => item.id === step.sourceCandidateId)
 		: undefined;
-	const eventId = candidate?.eventId;
-	const event = eventId ? session.events.find((item) => item.id === eventId) : undefined;
-	if (!event || (event.kind !== "click" && event.kind !== "hotkey")) {
-		return null;
-	}
-	if (isNormalizedNumber(event.normalizedX) && isNormalizedNumber(event.normalizedY)) {
-		return { x: clamp01(event.normalizedX), y: clamp01(event.normalizedY) };
-	}
-
 	const screenshotFileName = step.screenshotPath ? path.basename(step.screenshotPath) : undefined;
-	const snapshot =
+	return (
 		(candidate?.snapshotId
 			? session.snapshots.find((item) => item.id === candidate.snapshotId)
 			: undefined) ??
+		(candidate?.eventId
+			? session.snapshots.find((item) => item.eventId === candidate.eventId)
+			: undefined) ??
 		(screenshotFileName
-			? session.snapshots.find((item) => path.basename(item.path) === screenshotFileName)
+			? session.snapshots.find(
-			: undefined);
+					(item) =>
-	if (
+						path.basename(item.path) === screenshotFileName ||
-		!snapshot ||
+						(item.markedPath ? path.basename(item.markedPath) === screenshotFileName : false),
-		typeof event.x !== "number" ||
+				)
-		typeof event.y !== "number" ||
+			: undefined)
-		snapshot.width <= 0 ||
+	);
-		snapshot.height <= 0
-	) {
-		return null;
-	}
-
-	return {
-		x: clamp01(event.x / snapshot.width),
-		y: clamp01(event.y / snapshot.height),
-	};
-}
-
-function formatPercent(value: number): string {
-	return (clamp01(value) * 100).toFixed(2);
-}
-
-function isNormalizedNumber(value: unknown): value is number {
-	return typeof value === "number" && Number.isFinite(value) && value >= 0 && value <= 1;
-}
-
-function clamp01(value: number): number {
-	return Math.min(1, Math.max(0, value));
 }

src/guide/snapshot/extractGuideSnapshots.ts

@@ -4,6 +4,13 @@ export interface CaptureGuideSnapshotsInput {
 	session: GuideSession;
 	videoUrl: string;
 	maxWidth?: number;
+	onProgress?: (progress: CaptureGuideSnapshotsProgress) => void;
+}
+
+export interface CaptureGuideSnapshotsProgress {
+	event: GuideEvent;
+	completed: number;
+	total: number;
 }
 
 export async function captureGuideSnapshots(
@@ -13,6 +20,13 @@ export async function captureGuideSnapshots(
 	if (events.length === 0) {
 		return input.session;
 	}
+	const existingSnapshotsByEventId = new Set(
+		input.session.snapshots.map((snapshot) => snapshot.eventId),
+	);
+	const pendingEvents = events.filter((event) => !existingSnapshotsByEventId.has(event.id));
+	if (pendingEvents.length === 0) {
+		return input.session;
+	}
 
 	const video = document.createElement("video");
 	video.preload = "auto";
@@ -35,18 +49,24 @@ export async function captureGuideSnapshots(
 		canvas.height = Math.max(1, Math.round(sourceHeight * scale));
 
 		let latestSession = input.session;
-		for (const event of events) {
+		let completed = 0;
+		for (const event of pendingEvents) {
 			const offsetMs = event.screenshotOffsetMs ?? 500;
 			const timeMs = getSnapshotTimeMs(event, offsetMs, video.duration);
 			await seekVideo(video, timeMs / 1000);
 			context.drawImage(video, 0, 0, canvas.width, canvas.height);
 			const pngBytes = await canvasToPngBytes(canvas);
+			const markerPoint = getSnapshotMarkerPoint(event, canvas.width, canvas.height);
+			const markedPngBytes = markerPoint
+				? await canvasToMarkedPngBytes(canvas, markerPoint)
+				: undefined;
 			const result = await window.electronAPI.guide.writeSnapshot({
 				recordingId: input.session.recordingId,
 				eventId: event.id,
 				timeMs,
 				offsetMs,
 				pngBytes,
+				markedPngBytes,
 				width: canvas.width,
 				height: canvas.height,
 			});
@@ -54,6 +74,12 @@ export async function captureGuideSnapshots(
 				throw new Error(result.error);
 			}
 			latestSession = result.data;
+			completed += 1;
+			input.onProgress?.({
+				event,
+				completed,
+				total: pendingEvents.length,
+			});
 		}
 
 		return latestSession;
@@ -143,3 +169,75 @@ function canvasToPngBytes(canvas: HTMLCanvasElement): Promise<ArrayBuffer> {
 		}, "image/png");
 	});
 }
+
+async function canvasToMarkedPngBytes(
+	canvas: HTMLCanvasElement,
+	point: { x: number; y: number },
+): Promise<ArrayBuffer> {
+	const markedCanvas = document.createElement("canvas");
+	markedCanvas.width = canvas.width;
+	markedCanvas.height = canvas.height;
+	const markedContext = markedCanvas.getContext("2d");
+	if (!markedContext) {
+		throw new Error("Canvas 2D context is unavailable.");
+	}
+	markedContext.drawImage(canvas, 0, 0);
+	drawSnapshotMarker(markedContext, markedCanvas, point);
+	return await canvasToPngBytes(markedCanvas);
+}
+
+function drawSnapshotMarker(
+	context: CanvasRenderingContext2D,
+	canvas: HTMLCanvasElement,
+	point: { x: number; y: number },
+) {
+	const shortSide = Math.max(1, Math.min(canvas.width, canvas.height));
+	const dotRadius = clampNumber(Math.round(shortSide * 0.005), 4, 7);
+
+	context.beginPath();
+	context.arc(point.x, point.y, dotRadius, 0, Math.PI * 2);
+	context.fillStyle = "rgba(220, 38, 38, 0.92)";
+	context.fill();
+}
+
+function getSnapshotMarkerPoint(
+	event: GuideEvent,
+	width: number,
+	height: number,
+): { x: number; y: number } | null {
+	if (event.kind !== "click" && event.kind !== "hotkey") {
+		return null;
+	}
+	if (isNormalizedNumber(event.normalizedX) && isNormalizedNumber(event.normalizedY)) {
+		return {
+			x: clampNumber(event.normalizedX * width, 0, width),
+			y: clampNumber(event.normalizedY * height, 0, height),
+		};
+	}
+	if (isNormalizedNumber(event.x) && isNormalizedNumber(event.y)) {
+		return {
+			x: clampNumber(event.x * width, 0, width),
+			y: clampNumber(event.y * height, 0, height),
+		};
+	}
+	if (
+		typeof event.x === "number" &&
+		typeof event.y === "number" &&
+		Number.isFinite(event.x) &&
+		Number.isFinite(event.y)
+	) {
+		return {
+			x: clampNumber(event.x, 0, width),
+			y: clampNumber(event.y, 0, height),
+		};
+	}
+	return null;
+}
+
+function isNormalizedNumber(value: unknown): value is number {
+	return typeof value === "number" && Number.isFinite(value) && value >= 0 && value <= 1;
+}
+
+function clampNumber(value: number, min = 0, max = Number.POSITIVE_INFINITY): number {
+	return Math.min(max, Math.max(min, value));
+}

src/guide/videoAnnotations.test.ts

@@ -0,0 +1,122 @@
+import { describe, expect, it } from "vitest";
+import { GUIDE_SCHEMA_VERSION, type GuideSession } from "./contracts";
+import { buildGuideVideoAnnotations, buildGuideVideoSpeedRegions } from "./videoAnnotations";
+
+function createSession(): GuideSession {
+	return {
+		schemaVersion: GUIDE_SCHEMA_VERSION,
+		recordingId: "recording-1",
+		videoPath: "recording.mp4",
+		guidePath: "recording.guide.json",
+		outputDir: "recording-guide",
+		status: "draft-ready",
+		events: [],
+		snapshots: [],
+		ocrBlocks: [],
+		candidates: [
+			{
+				id: "candidate-1",
+				eventId: "event-1",
+				timeMs: 1200,
+				action: "click",
+				targetText: "Settings",
+				targetRole: "button",
+				position: {
+					normalizedX: 0.2,
+					normalizedY: 0.25,
+					xPercent: 20,
+					yPercent: 25,
+					description: "top left",
+				},
+				nearbyText: ["Settings"],
+				confidence: 0.91,
+			},
+		],
+		generatedGuide: {
+			title: "Guide",
+			steps: [
+				{
+					id: "step-1",
+					order: 1,
+					title: "Open settings",
+					instruction: "Click Settings.",
+					sourceCandidateId: "candidate-1",
+				},
+			],
+		},
+		createdAt: "2026-06-04T00:00:00.000Z",
+		updatedAt: "2026-06-04T00:00:00.000Z",
+	};
+}
+
+describe("buildGuideVideoAnnotations", () => {
+	it("creates caption and pointer annotations from generated guide candidates", () => {
+		let id = 1;
+		let zIndex = 1;
+		const annotations = buildGuideVideoAnnotations(createSession(), {
+			nextId: () => `guide-video-${id++}`,
+			nextZIndex: () => zIndex++,
+		});
+
+		expect(annotations).toHaveLength(3);
+		expect(annotations[0]).toMatchObject({
+			id: "guide-video-1",
+			type: "text",
+			startMs: 1200,
+			content: "1. Click Settings.",
+		});
+		expect(annotations[0]?.endMs).toBe(3200);
+		expect(annotations[0]?.position.x).toBeGreaterThan(20);
+		expect(annotations[1]?.endMs).toBe(3200);
+		expect(annotations[1]?.position.x).toBeGreaterThan((annotations[0]?.position.x ?? 0) + 34);
+		expect(annotations[1]?.position.y).toBeCloseTo(30.5);
+		expect(annotations[1]).toMatchObject({
+			id: "guide-video-2",
+			type: "magnifier",
+			magnifierData: {
+				target: { x: 20, y: 25 },
+				zoom: 2.2,
+				shape: "circle",
+				caption: "Settings",
+			},
+		});
+		expect(annotations[2]).toMatchObject({
+			id: "guide-video-3",
+			type: "figure",
+			endMs: 3200,
+			figureData: {
+				arrowDirection: "left",
+				color: "#34B27B",
+			},
+		});
+		expect(annotations[2]?.position.x).toBeGreaterThan(20);
+	});
+
+	it("returns an empty list when no draft exists", () => {
+		const session = createSession();
+		session.generatedGuide = undefined;
+
+		const annotations = buildGuideVideoAnnotations(session, {
+			nextId: () => "unused",
+			nextZIndex: () => 1,
+		});
+
+		expect(annotations).toEqual([]);
+	});
+
+	it("creates 0.3x speed regions for two seconds at each guide point", () => {
+		let id = 1;
+		const speedRegions = buildGuideVideoSpeedRegions(createSession(), {
+			nextId: () => `guide-speed-${id++}`,
+		});
+
+		expect(speedRegions).toEqual([
+			{
+				id: "guide-speed-1",
+				startMs: 1200,
+				endMs: 3200,
+				speed: 0.3,
+			},
+		]);
+	});
+});

src/guide/videoAnnotations.ts

@@ -0,0 +1,249 @@
+import {
+	type AnnotationRegion,
+	type ArrowDirection,
+	DEFAULT_ANNOTATION_STYLE,
+	DEFAULT_FIGURE_DATA,
+	DEFAULT_MAGNIFIER_DATA,
+	type SpeedRegion,
+} from "@/components/video-editor/types";
+import type { GeneratedGuideStep, GuideSession, GuideStepCandidate } from "./contracts";
+
+export interface BuildGuideVideoAnnotationsOptions {
+	nextId: () => string;
+	nextZIndex: () => number;
+	defaultDurationMs?: number;
+}
+
+const DEFAULT_STEP_DURATION_MS = 2000;
+const DEFAULT_STEP_SLOW_MOTION_DURATION_MS = 2000;
+const DEFAULT_STEP_SLOW_MOTION_SPEED = 0.3;
+const CAPTION_WIDTH = 34;
+const CAPTION_HEIGHT = 13;
+const MAGNIFIER_SIZE = 18;
+const ARROW_SIZE = 10;
+const ANNOTATION_GAP = 2;
+
+function clamp(value: number, min: number, max: number) {
+	return Math.min(max, Math.max(min, value));
+}
+
+function findCandidate(
+	step: GeneratedGuideStep,
+	stepIndex: number,
+	candidates: GuideStepCandidate[],
+): GuideStepCandidate | undefined {
+	if (step.sourceCandidateId) {
+		const matched = candidates.find((candidate) => candidate.id === step.sourceCandidateId);
+		if (matched) return matched;
+	}
+	const sorted = [...candidates].sort((left, right) => left.timeMs - right.timeMs);
+	return sorted[stepIndex];
+}
+
+function getCaptionPosition(candidate: GuideStepCandidate | undefined) {
+	const target = candidate?.position;
+	if (!target) {
+		return { x: 8, y: 8 };
+	}
+
+	const targetX = target.normalizedX * 100;
+	const targetY = target.normalizedY * 100;
+	const x = target.normalizedX < 0.5 ? targetX + 8 : targetX - CAPTION_WIDTH - 8;
+	const y = target.normalizedY < 0.5 ? targetY + 8 : targetY - CAPTION_HEIGHT - 8;
+
+	return {
+		x: clamp(x, 2, 100 - CAPTION_WIDTH - 2),
+		y: clamp(y, 2, 100 - CAPTION_HEIGHT - 2),
+	};
+}
+
+function getArrowDirection(
+	candidate: GuideStepCandidate | undefined,
+	originPosition: { x: number; y: number },
+	originSize: { width: number; height: number } = {
+		width: CAPTION_WIDTH,
+		height: CAPTION_HEIGHT,
+	},
+): ArrowDirection {
+	const target = candidate?.position;
+	if (!target) return "right";
+
+	const originCenterX = originPosition.x + originSize.width / 2;
+	const originCenterY = originPosition.y + originSize.height / 2;
+	const dx = target.normalizedX * 100 - originCenterX;
+	const dy = target.normalizedY * 100 - originCenterY;
+	const horizontal = dx > 8 ? "right" : dx < -8 ? "left" : "";
+	const vertical = dy > 8 ? "down" : dy < -8 ? "up" : "";
+
+	if (vertical && horizontal) return `${vertical}-${horizontal}` as ArrowDirection;
+	return (horizontal || vertical || "right") as ArrowDirection;
+}
+
+function getMagnifierPosition(captionPosition: { x: number; y: number }) {
+	const canPlaceRight = captionPosition.x + CAPTION_WIDTH + ANNOTATION_GAP + MAGNIFIER_SIZE <= 98;
+	const x = canPlaceRight
+		? captionPosition.x + CAPTION_WIDTH + ANNOTATION_GAP
+		: captionPosition.x - MAGNIFIER_SIZE - ANNOTATION_GAP;
+	const y = captionPosition.y + (CAPTION_HEIGHT - MAGNIFIER_SIZE) / 2;
+
+	return {
+		x: clamp(x, 2, 100 - MAGNIFIER_SIZE - 2),
+		y: clamp(y, 2, 100 - MAGNIFIER_SIZE - 2),
+	};
+}
+
+function getArrowPosition(
+	position: NonNullable<GuideStepCandidate["position"]>,
+	originPosition: { x: number; y: number },
+	originSize: { width: number; height: number },
+) {
+	const targetX = position.normalizedX * 100;
+	const targetY = position.normalizedY * 100;
+	const originCenterX = originPosition.x + originSize.width / 2;
+	const originCenterY = originPosition.y + originSize.height / 2;
+	const distance = Math.hypot(targetX - originCenterX, targetY - originCenterY);
+	const targetOffset = Math.min(18, Math.max(10, distance * 0.35));
+	const ratio = distance > 0 ? Math.max(0, (distance - targetOffset) / distance) : 0;
+	const arrowCenterX = originCenterX + (targetX - originCenterX) * ratio;
+	const arrowCenterY = originCenterY + (targetY - originCenterY) * ratio;
+
+	return {
+		x: clamp(arrowCenterX - ARROW_SIZE / 2, 0, 100 - ARROW_SIZE),
+		y: clamp(arrowCenterY - ARROW_SIZE / 2, 0, 100 - ARROW_SIZE),
+	};
+}
+
+function buildCaption(step: GeneratedGuideStep) {
+	const instruction = step.instruction.trim();
+	const title = step.title.trim();
+	if (instruction) {
+		return `${step.order}. ${instruction}`;
+	}
+	return title ? `${step.order}. ${title}` : `Step ${step.order}`;
+}
+
+export function buildGuideVideoAnnotations(
+	session: GuideSession,
+	options: BuildGuideVideoAnnotationsOptions,
+): AnnotationRegion[] {
+	const guide = session.generatedGuide;
+	if (!guide || guide.steps.length === 0) {
+		return [];
+	}
+
+	const durationMs = Math.max(1000, options.defaultDurationMs ?? DEFAULT_STEP_DURATION_MS);
+	const sortedSteps = [...guide.steps].sort((left, right) => left.order - right.order);
+	const annotations: AnnotationRegion[] = [];
+
+	for (const [index, step] of sortedSteps.entries()) {
+		const candidate = findCandidate(step, index, session.candidates);
+		const startMs = Math.max(0, Math.round(candidate?.timeMs ?? index * durationMs));
+		const endMs = Math.max(startMs + 750, startMs + durationMs);
+		const captionPosition = getCaptionPosition(candidate);
+
+		annotations.push({
+			id: options.nextId(),
+			startMs,
+			endMs,
+			type: "text",
+			content: buildCaption(step),
+			textContent: buildCaption(step),
+			position: captionPosition,
+			size: { width: CAPTION_WIDTH, height: CAPTION_HEIGHT },
+			style: {
+				...DEFAULT_ANNOTATION_STYLE,
+				color: "#f8fafc",
+				backgroundColor: "rgba(15, 23, 42, 0.88)",
+				fontSize: 18,
+				fontWeight: "bold",
+				textAlign: "left",
+			},
+			zIndex: options.nextZIndex(),
+		});
+
+		if (candidate?.position) {
+			const magnifierPosition = getMagnifierPosition(captionPosition);
+			const arrowPosition = getArrowPosition(candidate.position, magnifierPosition, {
+				width: MAGNIFIER_SIZE,
+				height: MAGNIFIER_SIZE,
+			});
+			const arrowDirection = getArrowDirection(candidate, arrowPosition, {
+				width: ARROW_SIZE,
+				height: ARROW_SIZE,
+			});
+
+			annotations.push({
+				id: options.nextId(),
+				startMs,
+				endMs,
+				type: "magnifier",
+				content: buildCaption(step),
+				position: magnifierPosition,
+				size: { width: MAGNIFIER_SIZE, height: MAGNIFIER_SIZE },
+				style: { ...DEFAULT_ANNOTATION_STYLE },
+				zIndex: options.nextZIndex(),
+				magnifierData: {
+					...DEFAULT_MAGNIFIER_DATA,
+					target: {
+						x: candidate.position.normalizedX * 100,
+						y: candidate.position.normalizedY * 100,
+					},
+					caption: candidate.targetText,
+				},
+			});
+			annotations.push({
+				id: options.nextId(),
+				startMs,
+				endMs,
+				type: "figure",
+				content: "",
+				position: arrowPosition,
+				size: { width: ARROW_SIZE, height: ARROW_SIZE },
+				style: { ...DEFAULT_ANNOTATION_STYLE },
+				zIndex: options.nextZIndex(),
+				figureData: {
+					...DEFAULT_FIGURE_DATA,
+					arrowDirection,
+					color: "#34B27B",
+					strokeWidth: 5,
+				},
+			});
+		}
+	}
+
+	return annotations;
+}
+
+export interface BuildGuideVideoSpeedRegionsOptions {
+	nextId: () => string;
+	durationMs?: number;
+	speed?: number;
+}
+
+export function buildGuideVideoSpeedRegions(
+	session: GuideSession,
+	options: BuildGuideVideoSpeedRegionsOptions,
+): SpeedRegion[] {
+	const guide = session.generatedGuide;
+	if (!guide || guide.steps.length === 0) {
+		return [];
+	}
+
+	const durationMs = Math.max(
+		100,
+		Math.round(options.durationMs ?? DEFAULT_STEP_SLOW_MOTION_DURATION_MS),
+	);
+	const speed = options.speed ?? DEFAULT_STEP_SLOW_MOTION_SPEED;
+	const sortedSteps = [...guide.steps].sort((left, right) => left.order - right.order);
+
+	return sortedSteps.map((step, index) => {
+		const candidate = findCandidate(step, index, session.candidates);
+		const startMs = Math.max(0, Math.round(candidate?.timeMs ?? index * durationMs));
+		return {
+			id: options.nextId(),
+			startMs,
+			endMs: startMs + durationMs,
+			speed,
+		};
+	});
+}

src/lib/exporter/annotationRenderer.ts

@@ -9,6 +9,8 @@ import {
 
 let blurScratchCanvas: HTMLCanvasElement | null = null;
 let blurScratchCtx: CanvasRenderingContext2D | null = null;
+let magnifierScratchCanvas: HTMLCanvasElement | null = null;
+let magnifierScratchCtx: CanvasRenderingContext2D | null = null;
 
 // Matches a single code point whose script is Han (including non-BMP
 // Extension A-F), Hiragana, Katakana (including halfwidth forms), or
@@ -396,6 +398,130 @@ async function renderImage(
 	});
 }
 
+function renderMagnifier(
+	ctx: CanvasRenderingContext2D,
+	annotation: AnnotationRegion,
+	x: number,
+	y: number,
+	width: number,
+	height: number,
+	canvasWidth: number,
+	canvasHeight: number,
+	scaleFactor: number,
+) {
+	if (!magnifierScratchCanvas || !magnifierScratchCtx) {
+		magnifierScratchCanvas = document.createElement("canvas");
+		magnifierScratchCtx = magnifierScratchCanvas.getContext("2d");
+	}
+	if (!magnifierScratchCanvas || !magnifierScratchCtx) return;
+
+	const data = annotation.magnifierData;
+	const zoom = Math.max(1, data?.zoom ?? 2.2);
+	const target = data?.target ?? {
+		x: annotation.position.x + annotation.size.width / 2,
+		y: annotation.position.y + annotation.size.height / 2,
+	};
+	const targetX = (target.x / 100) * canvasWidth;
+	const targetY = (target.y / 100) * canvasHeight;
+	const sampleWidth = Math.max(1, width / zoom);
+	const sampleHeight = Math.max(1, height / zoom);
+	const sx = Math.max(0, Math.min(canvasWidth - sampleWidth, targetX - sampleWidth / 2));
+	const sy = Math.max(0, Math.min(canvasHeight - sampleHeight, targetY - sampleHeight / 2));
+	const sw = Math.max(1, Math.min(sampleWidth, canvasWidth - sx));
+	const sh = Math.max(1, Math.min(sampleHeight, canvasHeight - sy));
+
+	magnifierScratchCanvas.width = Math.max(1, Math.round(width));
+	magnifierScratchCanvas.height = Math.max(1, Math.round(height));
+	magnifierScratchCtx.clearRect(0, 0, magnifierScratchCanvas.width, magnifierScratchCanvas.height);
+	magnifierScratchCtx.imageSmoothingEnabled = true;
+	magnifierScratchCtx.imageSmoothingQuality = "high";
+	magnifierScratchCtx.drawImage(
+		ctx.canvas,
+		sx,
+		sy,
+		sw,
+		sh,
+		0,
+		0,
+		magnifierScratchCanvas.width,
+		magnifierScratchCanvas.height,
+	);
+
+	const centerX = x + width / 2;
+	const centerY = y + height / 2;
+	const shape = data?.shape ?? "circle";
+	const radius = Math.min(width, height) / 2;
+	const cornerRadius = shape === "circle" ? radius : Math.min(18 * scaleFactor, radius);
+
+	ctx.save();
+	ctx.strokeStyle = "rgba(52,178,123,0.85)";
+	ctx.lineWidth = Math.max(2, 2 * scaleFactor);
+	ctx.beginPath();
+	ctx.moveTo(centerX, centerY);
+	ctx.lineTo(targetX, targetY);
+	ctx.stroke();
+	ctx.fillStyle = "#34B27B";
+	ctx.beginPath();
+	ctx.arc(targetX, targetY, Math.max(4, 4 * scaleFactor), 0, Math.PI * 2);
+	ctx.fill();
+
+	ctx.shadowColor = "rgba(0,0,0,0.38)";
+	ctx.shadowBlur = 24 * scaleFactor;
+	ctx.shadowOffsetY = 12 * scaleFactor;
+	ctx.fillStyle = "rgba(15,23,42,0.92)";
+	ctx.beginPath();
+	ctx.roundRect(x, y, width, height, cornerRadius);
+	ctx.fill();
+	ctx.restore();
+
+	ctx.save();
+	ctx.beginPath();
+	ctx.roundRect(x, y, width, height, cornerRadius);
+	ctx.clip();
+	ctx.drawImage(magnifierScratchCanvas, x, y, width, height);
+	ctx.restore();
+
+	ctx.save();
+	ctx.strokeStyle = "rgba(248,250,252,0.96)";
+	ctx.lineWidth = Math.max(3, 3 * scaleFactor);
+	ctx.beginPath();
+	ctx.roundRect(x, y, width, height, cornerRadius);
+	ctx.stroke();
+	ctx.strokeStyle = "rgba(52,178,123,0.58)";
+	ctx.lineWidth = Math.max(1, 1.5 * scaleFactor);
+	ctx.beginPath();
+	ctx.roundRect(
+		x + 2 * scaleFactor,
+		y + 2 * scaleFactor,
+		width - 4 * scaleFactor,
+		height - 4 * scaleFactor,
+		cornerRadius,
+	);
+	ctx.stroke();
+
+	const caption = data?.caption || "";
+	if (caption) {
+		const fontSize = Math.max(12, 13 * scaleFactor);
+		ctx.font = `bold ${fontSize}px Inter, sans-serif`;
+		ctx.textAlign = "center";
+		ctx.textBaseline = "middle";
+		const paddingX = 8 * scaleFactor;
+		const paddingY = 5 * scaleFactor;
+		const metrics = ctx.measureText(caption);
+		const captionWidth = Math.min(width * 1.6, metrics.width + paddingX * 2);
+		const captionHeight = fontSize + paddingY * 2;
+		const captionX = centerX - captionWidth / 2;
+		const captionY = y + height + 8 * scaleFactor;
+		ctx.fillStyle = "rgba(15,23,42,0.92)";
+		ctx.beginPath();
+		ctx.roundRect(captionX, captionY, captionWidth, captionHeight, 6 * scaleFactor);
+		ctx.fill();
+		ctx.fillStyle = "#f8fafc";
+		ctx.fillText(caption, centerX, captionY + captionHeight / 2, captionWidth - paddingX * 2);
+	}
+	ctx.restore();
+}
+
 export async function renderAnnotations(
 	ctx: CanvasRenderingContext2D,
 	annotations: AnnotationRegion[],
@@ -443,6 +569,20 @@ export async function renderAnnotations(
 				}
 				break;
 
+			case "magnifier":
+				renderMagnifier(
+					ctx,
+					annotation,
+					x,
+					y,
+					width,
+					height,
+					canvasWidth,
+					canvasHeight,
+					scaleFactor,
+				);
+				break;
+
 			case "blur":
 				renderBlur(ctx, annotation, x, y, width, height, scaleFactor);
 				break;

src/lib/updateStatus.ts

@@ -0,0 +1,29 @@
+export type UpdateStatusPhase =
+	| "idle"
+	| "checking"
+	| "available"
+	| "not-available"
+	| "downloading"
+	| "downloaded"
+	| "error"
+	| "unsupported";
+
+export interface UpdateStatus {
+	phase: UpdateStatusPhase;
+	currentVersion: string;
+	version?: string;
+	releaseName?: string;
+	releaseNotes?: string;
+	percent?: number;
+	bytesPerSecond?: number;
+	transferred?: number;
+	total?: number;
+	error?: string;
+	updatedAt: string;
+}
+
+export interface UpdateCheckResult {
+	success: boolean;
+	status: UpdateStatus;
+	error?: string;
+}

tools/ocr/paddle_ocr_service.py

@@ -5,8 +5,9 @@ import importlib.util
 import os
 import sys
 import tempfile
+from dataclasses import dataclass
 from pathlib import Path
-from threading import Lock
+from threading import Lock, Thread
 from typing import Any
 
 from fastapi import FastAPI, HTTPException
@@ -17,6 +18,67 @@ app = FastAPI(title="OpenScreen PaddleOCR service")
 
 _engines: dict[str, Any] = {}
 _engine_lock = Lock()
+_warmup_lock = Lock()
+_warmup_started = False
+_LATIN_RECOGNITION_LANGS = {
+    "af",
+    "az",
+    "bs",
+    "ca",
+    "cs",
+    "cy",
+    "da",
+    "de",
+    "en",
+    "es",
+    "et",
+    "eu",
+    "fi",
+    "fr",
+    "ga",
+    "gl",
+    "hr",
+    "hu",
+    "id",
+    "is",
+    "it",
+    "ku",
+    "la",
+    "latin",
+    "lb",
+    "lt",
+    "lv",
+    "mi",
+    "ms",
+    "mt",
+    "nl",
+    "no",
+    "oc",
+    "pi",
+    "pl",
+    "pt",
+    "qu",
+    "rm",
+    "ro",
+    "rs_latin",
+    "rslatin",
+    "sk",
+    "sl",
+    "sq",
+    "sv",
+    "sw",
+    "tl",
+    "tr",
+    "uz",
+    "vi",
+}
+
+
+@dataclass(frozen=True)
+class PreparedImage:
+    path: str
+    scale: float = 1.0
+    should_delete: bool = False
 
 
 class OcrRequest(BaseModel):
@@ -24,6 +86,21 @@ class OcrRequest(BaseModel):
     path: str | None = None
     imagePath: str | None = None
     language: str | None = None
+    profile: str | None = None
+
+
+@app.on_event("startup")
+def start_ocr_warmup() -> None:
+    if os.getenv("OPENSCREEN_OCR_WARMUP", "0") != "1":
+        return
+
+    global _warmup_started
+    with _warmup_lock:
+        if _warmup_started:
+            return
+        _warmup_started = True
+
+    Thread(target=_warmup_default_engines, name="openscreen-ocr-warmup", daemon=True).start()
 
 
 @app.get("/health")
@@ -33,16 +110,31 @@ def health() -> dict[str, Any]:
         "paddleocrInstalled": importlib.util.find_spec("paddleocr") is not None,
         "paddleInstalled": importlib.util.find_spec("paddle") is not None,
         "engineReady": bool(_engines),
-        "defaultLanguage": os.getenv("PADDLEOCR_LANG", "latin"),
+        "defaultLanguage": os.getenv("PADDLEOCR_LANG") or "vi,en",
+        "defaultProfile": os.getenv("OPENSCREEN_OCR_PROFILE") or "vietnamese",
+        "loadedEngines": sorted(_engines.keys()),
     }
 
 
+def _warmup_default_engines() -> None:
+    try:
+        profile = _resolve_ocr_profile(None)
+        for paddle_lang in _resolve_paddle_languages(None, profile):
+            _get_engine(paddle_lang)
+    except Exception as error:
+        print(f"OpenScreen OCR warmup failed: {error}", file=sys.stderr, flush=True)
+
+
 @app.post("/ocr")
 async def ocr(request: OcrRequest) -> dict[str, Any]:
     image_path, should_delete = _resolve_image_path(request)
     try:
-        engine = _get_engine(request.language)
+        blocks = await run_in_threadpool(
-        blocks = await run_in_threadpool(_recognize_blocks, engine, image_path)
+            _recognize_profile_blocks,
+            image_path,
+            request.language,
+            request.profile,
+        )
         return {"blocks": blocks}
     finally:
         if should_delete:
@@ -73,8 +165,7 @@ def _resolve_image_path(request: OcrRequest) -> tuple[str, bool]:
     return handle.name, True
 
 
-def _get_engine(language: str | None) -> Any:
+def _get_engine(paddle_lang: str) -> Any:
-    paddle_lang = _resolve_paddle_language(language)
     cache_key = f"{paddle_lang}|{os.getenv('PADDLEOCR_DEVICE', 'cpu')}"
     with _engine_lock:
         if cache_key not in _engines:
@@ -105,13 +196,17 @@ def _create_engine(paddle_lang: str) -> Any:
         "enable_mkldnn": os.getenv("PADDLEOCR_ENABLE_MKLDNN", "0") == "1",
         "use_doc_orientation_classify": False,
         "use_doc_unwarping": False,
-        "use_textline_orientation": False,
+        "use_textline_orientation": os.getenv("PADDLEOCR_USE_TEXTLINE_ORIENTATION", "0") == "1",
     }
     if os.getenv("PADDLEOCR_USE_MOBILE", "1") != "0":
         modern_kwargs.update(
             {
-                "text_detection_model_name": "PP-OCRv5_mobile_det",
+                "text_detection_model_name": os.getenv(
-                "text_recognition_model_name": _mobile_recognition_model(paddle_lang),
+                    "PADDLEOCR_DET_MODEL",
+                    "PP-OCRv5_mobile_det",
+                ),
+                "text_recognition_model_name": os.getenv("PADDLEOCR_REC_MODEL")
+                or _mobile_recognition_model(paddle_lang),
             }
         )
 
@@ -150,23 +245,236 @@ def _patch_paddlex_frozen_ocr_extra_gate() -> None:
     deps._openscreen_ocr_extra_patch = True
 
 
-def _resolve_paddle_language(language: str | None) -> str:
+def _recognize_profile_blocks(
-    explicit = os.getenv("PADDLEOCR_LANG")
+    image_path: str,
+    language: str | None,
+    profile: str | None,
+) -> list[dict[str, Any]]:
+    ocr_profile = _resolve_ocr_profile(profile)
+    languages = _resolve_paddle_languages(language, ocr_profile)
+    prepared = _prepare_image_for_profile(image_path, ocr_profile)
+    try:
+        blocks: list[dict[str, Any]] = []
+        for paddle_lang in languages:
+            engine = _get_engine(paddle_lang)
+            recognized = _recognize_blocks(engine, prepared.path)
+            blocks.extend(_scale_blocks(recognized, prepared.scale))
+        return _merge_blocks(blocks)
+    finally:
+        if prepared.should_delete:
+            Path(prepared.path).unlink(missing_ok=True)
+
+
+def _resolve_ocr_profile(profile: str | None) -> str:
+    explicit = (os.getenv("OPENSCREEN_OCR_PROFILE") or "").strip().lower()
+    value = explicit or (profile or "").strip().lower()
+    if value in {"fast", "vietnamese", "hybrid"}:
+        return value
+    return "vietnamese"
+
+
+def _resolve_paddle_languages(language: str | None, profile: str) -> list[str]:
+    explicit = (os.getenv("PADDLEOCR_LANG") or "").strip().lower()
     if explicit:
-        return explicit
+        return [explicit]
 
     language_value = (language or "vi,en").lower()
-    if "vi" in language_value or "latin" in language_value:
+    has_vietnamese = "vi" in _split_language_tags(language_value)
+    if profile == "fast":
+        return [_resolve_primary_paddle_language(language_value, prefer_vietnamese=False)]
+    if profile == "hybrid":
+        languages = ["vi"] if has_vietnamese else []
+        languages.append("latin")
+        return _dedupe_languages(languages)
+    return [_resolve_primary_paddle_language(language_value, prefer_vietnamese=True)]
+
+
+def _split_language_tags(language: str) -> set[str]:
+    return {part.strip().lower() for part in language.split(",") if part.strip()}
+
+
+def _dedupe_languages(languages: list[str]) -> list[str]:
+    seen: set[str] = set()
+    result: list[str] = []
+    for language in languages:
+        if language not in seen:
+            seen.add(language)
+            result.append(language)
+    return result
+
+
+def _resolve_primary_paddle_language(language_value: str, *, prefer_vietnamese: bool) -> str:
+    tags = _split_language_tags(language_value)
+    if prefer_vietnamese and "vi" in tags:
+        return "vi"
+    if "latin" in tags or "vi" in tags or "en" in tags:
         return "latin"
-    if "en" in language_value:
+    for tag in tags:
-        return "en"
+        return tag
-    return language_value.split(",")[0].strip() or "latin"
+    return "latin"
+
+
+def _prepare_image_for_profile(image_path: str, profile: str) -> PreparedImage:
+    if profile == "fast":
+        return PreparedImage(image_path)
+
+    try:
+        from PIL import Image, ImageEnhance, ImageOps
+    except Exception:
+        return PreparedImage(image_path)
+
+    try:
+        with Image.open(image_path) as source:
+            image = source.convert("RGB")
+    except Exception:
+        return PreparedImage(image_path)
+
+    scale = _resolve_enhancement_scale(image.width, image.height)
+    if scale <= 1:
+        return PreparedImage(image_path)
+
+    resampling = getattr(getattr(Image, "Resampling", Image), "LANCZOS")
+    enhanced = image.resize((round(image.width * scale), round(image.height * scale)), resampling)
+    enhanced = ImageOps.autocontrast(enhanced)
+    enhanced = ImageEnhance.Contrast(enhanced).enhance(1.25)
+    enhanced = ImageEnhance.Sharpness(enhanced).enhance(1.35)
+
+    handle = tempfile.NamedTemporaryFile(prefix="openscreen-ocr-enhanced-", suffix=".png", delete=False)
+    try:
+        handle.close()
+        enhanced.save(handle.name, format="PNG")
+        return PreparedImage(handle.name, scale=scale, should_delete=True)
+    except Exception:
+        Path(handle.name).unlink(missing_ok=True)
+        return PreparedImage(image_path)
+
+
+def _resolve_enhancement_scale(width: int, height: int) -> float:
+    try:
+        requested_scale = float(os.getenv("OPENSCREEN_OCR_ENHANCE_SCALE", "2"))
+    except ValueError:
+        requested_scale = 2.0
+    scale = max(1.0, min(3.0, requested_scale))
+    try:
+        max_side = int(os.getenv("OPENSCREEN_OCR_ENHANCE_MAX_SIDE", "2400"))
+    except ValueError:
+        max_side = 2400
+    largest_side = max(width, height)
+    if largest_side <= 0:
+        return 1.0
+    return max(1.0, min(scale, max_side / largest_side))
+
+
+def _scale_blocks(blocks: list[dict[str, Any]], scale: float) -> list[dict[str, Any]]:
+    if scale <= 1:
+        return blocks
+
+    scaled_blocks: list[dict[str, Any]] = []
+    for block in blocks:
+        box = block.get("box")
+        if not isinstance(box, dict) or not _box_uses_pixels(box):
+            scaled_blocks.append(block)
+            continue
+        scaled_box = {
+            "x": float(box["x"]) / scale,
+            "y": float(box["y"]) / scale,
+            "width": float(box["width"]) / scale,
+            "height": float(box["height"]) / scale,
+        }
+        scaled_blocks.append({**block, "box": scaled_box})
+    return scaled_blocks
+
+
+def _box_uses_pixels(box: dict[str, Any]) -> bool:
+    try:
+        x = float(box["x"])
+        y = float(box["y"])
+        width = float(box["width"])
+        height = float(box["height"])
+    except (KeyError, TypeError, ValueError):
+        return False
+    return x > 1 or y > 1 or width > 1 or height > 1 or x + width > 1 or y + height > 1
+
+
+def _merge_blocks(blocks: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    merged: list[dict[str, Any]] = []
+    for block in sorted(blocks, key=_block_quality, reverse=True):
+        box = block.get("box")
+        if not isinstance(box, dict):
+            continue
+        overlapping_index = next(
+            (
+                index
+                for index, existing in enumerate(merged)
+                if _box_iou(box, existing.get("box")) >= 0.62
+            ),
+            None,
+        )
+        if overlapping_index is None:
+            merged.append(block)
+            continue
+        if _block_quality(block) > _block_quality(merged[overlapping_index]):
+            merged[overlapping_index] = block
+    return sorted(merged, key=lambda block: _box_sort_key(block.get("box")))
+
+
+def _block_quality(block: dict[str, Any]) -> float:
+    text = str(block.get("text") or "")
+    score = _score_to_float(block.get("confidence"))
+    if _has_vietnamese_diacritics(text):
+        score += 0.08
+    if len(text) >= 2:
+        score += min(0.04, len(text) * 0.002)
+    return score
+
+
+def _has_vietnamese_diacritics(text: str) -> bool:
+    return any(
+        character
+        in "ăâđêôơưĂÂĐÊÔƠƯáàảãạắằẳẵặấầẩẫậéèẻẽẹếềểễệíìỉĩịóòỏõọốồổỗộớờởỡợúùủũụứừửữựýỳỷỹỵ"
+        for character in text
+    )
+
+
+def _box_iou(left: Any, right: Any) -> float:
+    if not isinstance(left, dict) or not isinstance(right, dict):
+        return 0.0
+    try:
+        left_x = float(left["x"])
+        left_y = float(left["y"])
+        left_width = float(left["width"])
+        left_height = float(left["height"])
+        right_x = float(right["x"])
+        right_y = float(right["y"])
+        right_width = float(right["width"])
+        right_height = float(right["height"])
+    except (KeyError, TypeError, ValueError):
+        return 0.0
+
+    intersection_left = max(left_x, right_x)
+    intersection_top = max(left_y, right_y)
+    intersection_right = min(left_x + left_width, right_x + right_width)
+    intersection_bottom = min(left_y + left_height, right_y + right_height)
+    intersection_width = max(0.0, intersection_right - intersection_left)
+    intersection_height = max(0.0, intersection_bottom - intersection_top)
+    intersection_area = intersection_width * intersection_height
+    if intersection_area <= 0:
+        return 0.0
+    union_area = left_width * left_height + right_width * right_height - intersection_area
+    return intersection_area / union_area if union_area > 0 else 0.0
+
+
+def _box_sort_key(box: Any) -> tuple[float, float]:
+    if not isinstance(box, dict):
+        return (0.0, 0.0)
+    try:
+        return (float(box["y"]), float(box["x"]))
+    except (KeyError, TypeError, ValueError):
+        return (0.0, 0.0)
 
 
 def _mobile_recognition_model(paddle_lang: str) -> str:
-    if paddle_lang == "en":
+    if paddle_lang in _LATIN_RECOGNITION_LANGS:
-        return "en_PP-OCRv5_mobile_rec"
-    if paddle_lang == "latin":
         return "latin_PP-OCRv5_mobile_rec"
     return "PP-OCRv5_mobile_rec"