diff --git a/README.md b/README.md
index a854df8..abe4797 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,13 @@ A comic reader that support reading local and network comics.
 - View comments, tags, and other information of comics if the source supports
 - Login to comment, rate, and other operations if the source supports
 
+## Build from source
+
+1. Clone the repository
+2. Install flutter, see [flutter.dev](https://flutter.dev/docs/get-started/install)
+3. Install rust, see [rustup.rs](https://rustup.rs/)
+4. Build for your platform: e.g. `flutter build apk`
+
 ## Create a new comic source
 
 See [venera-configs](https://github.com/venera-app/venera-configs)
diff --git a/android/app/build.gradle b/android/app/build.gradle
index 0394805..59f3a36 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -75,6 +75,9 @@ android {
 
     buildTypes {
         release {
+            ndk {
+                abiFilters "armeabi-v7a", "arm64-v8a", "x86", "x86_64"
+            }
             signingConfig signingConfigs.release
             applicationVariants.all { variant ->
                 variant.outputs.all { output ->
diff --git a/assets/init.js b/assets/init.js
index 9f00eb3..932590c 100644
--- a/assets/init.js
+++ b/assets/init.js
@@ -224,7 +224,25 @@ let Convert = {
             key: key,
             isEncode: false
         });
-    }
+    },
+    /** Encode bytes to hex string
+     * @param bytes {ArrayBuffer}
+     * @return {string}
+     */
+    hexEncode: (bytes) => {
+        const hexDigits = '0123456789abcdef';
+        const view = new Uint8Array(bytes);
+        let charCodes = new Uint8Array(view.length * 2);
+        let j = 0;
+
+        for (let i = 0; i < view.length; i++) {
+            let byte = view[i];
+            charCodes[j++] = hexDigits.charCodeAt((byte >> 4) & 0xF);
+            charCodes[j++] = hexDigits.charCodeAt(byte & 0xF);
+        }
+
+        return String.fromCharCode(...charCodes);
+    },
 }
 
 /**
@@ -999,4 +1017,118 @@ class ComicSource {
     init() { }
 
     static sources = {}
-}
\ No newline at end of file
+}
+
+/// A reference to dart object.
+/// The api can only be used in the comic.onImageLoad.modifyImage function
+class Image {
+    key = 0;
+
+    constructor(key) {
+        this.key = key;
+    }
+
+    /**
+     * Copy the specified range of the image
+     * @param x
+     * @param y
+     * @param width
+     * @param height
+     * @returns {Image|null}
+     */
+    copyRange(x, y, width, height) {
+        let key = sendMessage({
+            method: "image",
+            function: "copyRange",
+            key: this.key,
+            x: x,
+            y: y,
+            width: width,
+            height: height
+        })
+        if(key == null) return null;
+        return new Image(key);
+    }
+
+    /**
+     * Copy the image and rotate 90 degrees
+     * @returns {Image|null}
+     */
+    copyAndRotate90() {
+        let key = sendMessage({
+            method: "image",
+            function: "copyAndRotate90",
+            key: this.key
+        })
+        if(key == null) return null;
+        return new Image(key);
+    }
+
+    /**
+     * fill [image] to this image at (x, y)
+     * @param x
+     * @param y
+     * @param image
+     */
+    fillImageAt(x, y, image) {
+        sendMessage({
+            method: "image",
+            function: "fillImageAt",
+            key: this.key,
+            x: x,
+            y: y,
+            image: image.key
+        })
+    }
+
+    /**
+     * fill [image] with range(srcX, srcY, width, height) to this image at (x, y)
+     * @param x
+     * @param y
+     * @param image
+     * @param srcX
+     * @param srcY
+     * @param width
+     * @param height
+     */
+    fillImageRangeAt(x, y, image, srcX, srcY, width, height) {
+        sendMessage({
+            method: "image",
+            function: "fillImageRangeAt",
+            key: this.key,
+            x: x,
+            y: y,
+            image: image.key,
+            srcX: srcX,
+            srcY: srcY,
+            width: width,
+            height: height
+        })
+    }
+
+    get width() {
+        return sendMessage({
+            method: "image",
+            function: "getWidth",
+            key: this.key
+        })
+    }
+
+    get height() {
+        return sendMessage({
+            method: "image",
+            function: "getHeight",
+            key: this.key
+        })
+    }
+
+    static empty(width, height) {
+        let key = sendMessage({
+            method: "image",
+            function: "emptyImage",
+            width: width,
+            height: height
+        })
+        return new Image(key);
+    }
+}
diff --git a/assets/translation.json b/assets/translation.json
index 796bab9..0df06c2 100644
--- a/assets/translation.json
+++ b/assets/translation.json
@@ -19,7 +19,7 @@
     "Select": "选择",
     "Imported @a comics": "已导入 @a 部漫画",
     "Downloading": "下载中",
-    "Back": "返回",
+    "Back": "后退",
     "Delete": "删除",
     "Full Screen": "全屏",
     "Auto Page Turning": "自动翻页",
@@ -155,7 +155,21 @@
     "Start": "开始",
     "Export App Data": "导出应用数据",
     "Import App Data": "导入应用数据",
-    "Export": "导出"
+    "Export": "导出",
+    "Download Threads": "下载线程数",
+    "Update Time": "更新时间",
+    "Copy ID": "复制ID",
+    "Copy URL": "复制URL",
+    "Create": "创建",
+    "Folder Name": "文件夹名称",
+    "Ranking": "排行",
+    "Download Selected": "下载选中",
+    "Download All": "下载全部",
+    "Order": "顺序",
+    "minAppVersion @version is required": "需要最低App版本 @version",
+    "Remove": "移除",
+    "Long press to zoom": "长按缩放",
+    "Updates Available": "更新可用"
   },
   "zh_TW": {
     "Home": "首頁",
@@ -178,7 +192,7 @@
     "Select": "選擇",
     "Imported @a comics": "已匯入 @a 部漫畫",
     "Downloading": "下載中",
-    "Back": "返回",
+    "Back": "後退",
     "Delete": "刪除",
     "Full Screen": "全螢幕",
     "Auto Page Turning": "自動翻頁",
@@ -313,6 +327,20 @@
     "Start": "開始",
     "Export App Data": "匯出應用數據",
     "Import App Data": "匯入應用數據",
-    "Export": "匯出"
+    "Export": "匯出",
+    "Download Threads": "下載線程數",
+    "Update Time": "更新時間",
+    "Copy ID": "複製ID",
+    "Copy URL": "複製URL",
+    "Create": "創建",
+    "Folder Name": "文件夾名稱",
+    "Ranking": "排行",
+    "Download Selected": "下載選中",
+    "Download All": "下載全部",
+    "Order": "順序",
+    "minAppVersion @version is required": "需要最低App版本 @version",
+    "Remove": "移除",
+    "Long press to zoom": "長按縮放",
+    "Updates Available": "更新可用"
   }
 }
\ No newline at end of file
diff --git a/lib/components/comic.dart b/lib/components/comic.dart
index 2c4c4c3..ab8c073 100644
--- a/lib/components/comic.dart
+++ b/lib/components/comic.dart
@@ -454,7 +454,9 @@ class _ComicDescription extends StatelessWidget {
                 ),
               ).toAlign(Alignment.topCenter);
             }),
-          ),
+          )
+        else
+          const Spacer(),
         Row(
           crossAxisAlignment: CrossAxisAlignment.end,
           children: [
diff --git a/lib/components/message.dart b/lib/components/message.dart
index 642dae6..d1fb8aa 100644
--- a/lib/components/message.dart
+++ b/lib/components/message.dart
@@ -129,13 +129,14 @@ void showDialogMessage(BuildContext context, String title, String message) {
   );
 }
 
-void showConfirmDialog({
+Future<void> showConfirmDialog({
   required BuildContext context,
   required String title,
   required String content,
   required void Function() onConfirm,
+  String confirmText = "Confirm",
 }) {
-  showDialog(
+  return showDialog(
     context: context,
     builder: (context) => ContentDialog(
       title: title,
@@ -146,7 +147,7 @@ void showConfirmDialog({
             context.pop();
             onConfirm();
           },
-          child: Text("Confirm".tl),
+          child: Text(confirmText.tl),
         ),
       ],
     ),
diff --git a/lib/foundation/app.dart b/lib/foundation/app.dart
index 056cfc7..e1456b6 100644
--- a/lib/foundation/app.dart
+++ b/lib/foundation/app.dart
@@ -10,7 +10,7 @@ export "widget_utils.dart";
 export "context.dart";
 
 class _App {
-  final version = "1.0.1";
+  final version = "1.0.2";
 
   bool get isAndroid => Platform.isAndroid;
 
diff --git a/lib/foundation/appdata.dart b/lib/foundation/appdata.dart
index a81f42e..817aa96 100644
--- a/lib/foundation/appdata.dart
+++ b/lib/foundation/appdata.dart
@@ -110,6 +110,9 @@ class _Settings with ChangeNotifier {
     'enablePageAnimation': true,
     'language': 'system', // system, zh-CN, zh-TW, en-US
     'cacheSize': 2048, // in MB
+    'downloadThreads': 5,
+    'enableLongPressToZoom': true,
+    'checkUpdateOnStart': true,
   };
 
   operator [](String key) {
diff --git a/lib/foundation/comic_source/comic_source.dart b/lib/foundation/comic_source/comic_source.dart
index 06621ad..f4c64df 100644
--- a/lib/foundation/comic_source/comic_source.dart
+++ b/lib/foundation/comic_source/comic_source.dart
@@ -12,6 +12,7 @@ import 'package:venera/foundation/history.dart';
 import 'package:venera/foundation/res.dart';
 import 'package:venera/utils/ext.dart';
 import 'package:venera/utils/io.dart';
+import 'package:venera/utils/translations.dart';
 
 import '../js_engine.dart';
 import '../log.dart';
diff --git a/lib/foundation/comic_source/parser.dart b/lib/foundation/comic_source/parser.dart
index ed723df..b02c54f 100644
--- a/lib/foundation/comic_source/parser.dart
+++ b/lib/foundation/comic_source/parser.dart
@@ -106,7 +106,9 @@ class ComicSourceParser {
     if (minAppVersion != null) {
       if (compareSemVer(minAppVersion, App.version.split('-').first)) {
         throw ComicSourceParseException(
-            "minAppVersion $minAppVersion is required");
+          "minAppVersion @version is required"
+              .tlParams({"version": minAppVersion}),
+        );
       }
     }
     for (var source in ComicSource.all()) {
@@ -728,7 +730,7 @@ class ComicSourceParser {
 
         return retryZone(func);
       };
-      if(_checkExists("favorites.addFolder")) {
+      if (_checkExists("favorites.addFolder")) {
         addFolder = (name) async {
           try {
             await JsEngine().runCode("""
@@ -741,7 +743,7 @@ class ComicSourceParser {
           }
         };
       }
-      if(_checkExists("favorites.deleteFolder")) {
+      if (_checkExists("favorites.deleteFolder")) {
         deleteFolder = (key) async {
           try {
             await JsEngine().runCode("""
diff --git a/lib/foundation/image_provider/base_image_provider.dart b/lib/foundation/image_provider/base_image_provider.dart
index cdc1797..57dd120 100644
--- a/lib/foundation/image_provider/base_image_provider.dart
+++ b/lib/foundation/image_provider/base_image_provider.dart
@@ -87,17 +87,16 @@ abstract class BaseImageProvider<T extends BaseImageProvider<T>>
         return await decode(buffer);
       } catch (e) {
         await CacheManager().delete(this.key);
-        Object error = e;
         if (data.length < 2 * 1024) {
           // data is too short, it's likely that the data is text, not image
           try {
             var text = const Utf8Codec(allowMalformed: false).decoder.convert(data);
-            error = Exception("Expected image data, but got text: $text");
+            throw Exception("Expected image data, but got text: $text");
           } catch (e) {
             // ignore
           }
         }
-        throw error;
+        rethrow;
       }
     } catch (e) {
       scheduleMicrotask(() {
diff --git a/lib/foundation/js_engine.dart b/lib/foundation/js_engine.dart
index 2eefa60..8ae647f 100644
--- a/lib/foundation/js_engine.dart
+++ b/lib/foundation/js_engine.dart
@@ -1,7 +1,6 @@
 import 'dart:convert';
 import 'dart:io';
 import 'dart:math' as math;
-
 import 'package:crypto/crypto.dart';
 import 'package:flutter/services.dart';
 import 'package:html/parser.dart' as html;
@@ -238,7 +237,7 @@ mixin class _JSEngineApi {
           Log.warning(
             "JS Engine",
             "Too many documents, deleting the oldest: $shouldDelete\n"
-            "Current documents: ${_documents.keys}",
+                "Current documents: ${_documents.keys}",
           );
           _documents.remove(shouldDelete);
         }
@@ -350,9 +349,6 @@ mixin class _JSEngineApi {
         case "utf8":
           return isEncode ? utf8.encode(value) : utf8.decode(value);
         case "base64":
-          if (value is String) {
-            value = utf8.encode(value);
-          }
           return isEncode ? base64Encode(value) : base64Decode(value);
         case "md5":
           return Uint8List.fromList(md5.convert(value).bytes);
@@ -383,8 +379,21 @@ mixin class _JSEngineApi {
           if (!isEncode) {
             var key = data["key"];
             var cipher = ECBBlockCipher(AESEngine());
-            cipher.init(false, KeyParameter(key));
-            return cipher.process(value);
+            cipher.init(
+              false,
+              KeyParameter(key),
+            );
+            var offset = 0;
+            var result = Uint8List(value.length);
+            while (offset < value.length) {
+              offset += cipher.processBlock(
+                value,
+                offset,
+                result,
+                offset,
+              );
+            }
+            return result;
           }
           return null;
         case "aes-cbc":
@@ -393,7 +402,17 @@ mixin class _JSEngineApi {
             var iv = data["iv"];
             var cipher = CBCBlockCipher(AESEngine());
             cipher.init(false, ParametersWithIV(KeyParameter(key), iv));
-            return cipher.process(value);
+            var offset = 0;
+            var result = Uint8List(value.length);
+            while (offset < value.length) {
+              offset += cipher.processBlock(
+                value,
+                offset,
+                result,
+                offset,
+              );
+            }
+            return result;
           }
           return null;
         case "aes-cfb":
@@ -402,7 +421,17 @@ mixin class _JSEngineApi {
             var blockSize = data["blockSize"];
             var cipher = CFBBlockCipher(AESEngine(), blockSize);
             cipher.init(false, KeyParameter(key));
-            return cipher.process(value);
+            var offset = 0;
+            var result = Uint8List(value.length);
+            while (offset < value.length) {
+              offset += cipher.processBlock(
+                value,
+                offset,
+                result,
+                offset,
+              );
+            }
+            return result;
           }
           return null;
         case "aes-ofb":
@@ -411,7 +440,17 @@ mixin class _JSEngineApi {
             var blockSize = data["blockSize"];
             var cipher = OFBBlockCipher(AESEngine(), blockSize);
             cipher.init(false, KeyParameter(key));
-            return cipher.process(value);
+            var offset = 0;
+            var result = Uint8List(value.length);
+            while (offset < value.length) {
+              offset += cipher.processBlock(
+                value,
+                offset,
+                result,
+                offset,
+              );
+            }
+            return result;
           }
           return null;
         case "rsa":
@@ -426,8 +465,8 @@ mixin class _JSEngineApi {
         default:
           return value;
       }
-    } catch (e) {
-      Log.error("JS Engine", "Failed to convert $type: $e");
+    } catch (e, s) {
+      Log.error("JS Engine", "Failed to convert $type: $e", s);
       return null;
     }
   }
diff --git a/lib/main.dart b/lib/main.dart
index 9a7be51..7351392 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -3,8 +3,12 @@ import 'package:desktop_webview_window/desktop_webview_window.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:rhttp/rhttp.dart';
 import 'package:venera/foundation/log.dart';
+import 'package:venera/network/app_dio.dart';
+import 'package:venera/pages/comic_source_page.dart';
 import 'package:venera/pages/main_page.dart';
+import 'package:venera/pages/settings/settings_page.dart';
 import 'package:venera/utils/app_links.dart';
 import 'package:window_manager/window_manager.dart';
 import 'components/components.dart';
@@ -18,6 +22,7 @@ void main(List<String> args) {
     return;
   }
   runZonedGuarded(() async {
+    await Rhttp.init();
     WidgetsFlutterBinding.ensureInitialized();
     await init();
     if (App.isAndroid) {
@@ -63,6 +68,7 @@ class MyApp extends StatefulWidget {
 class _MyAppState extends State<MyApp> {
   @override
   void initState() {
+    checkUpdates();
     App.registerForceRebuild(forceRebuild);
     SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
     super.initState();
@@ -163,6 +169,22 @@ class _MyAppState extends State<MyApp> {
       },
     );
   }
+
+  void checkUpdates() async {
+    if(!appdata.settings['checkUpdateOnStart']) {
+      return;
+    }
+    var lastCheck = appdata.implicitData['lastCheckUpdate'] ?? 0;
+    var now = DateTime.now().millisecondsSinceEpoch;
+    if(now - lastCheck < 24 * 60 * 60 * 1000) {
+      return;
+    }
+    appdata.implicitData['lastCheckUpdate'] = now;
+    appdata.writeImplicitData();
+    await Future.delayed(const Duration(milliseconds: 300));
+    await checkUpdateUi(false);
+    await ComicSourcePage.checkComicSourceUpdate(true);
+  }
 }
 
 class _SystemUiProvider extends StatelessWidget {
diff --git a/lib/network/app_dio.dart b/lib/network/app_dio.dart
index 0a060a1..dbbc7bc 100644
--- a/lib/network/app_dio.dart
+++ b/lib/network/app_dio.dart
@@ -2,8 +2,8 @@ import 'dart:convert';
 import 'dart:io';
 
 import 'package:dio/dio.dart';
-import 'package:dio/io.dart';
 import 'package:flutter/services.dart';
+import 'package:rhttp/rhttp.dart' as rhttp;
 import 'package:venera/foundation/appdata.dart';
 import 'package:venera/foundation/log.dart';
 import 'package:venera/network/cache.dart';
@@ -109,7 +109,7 @@ class AppDio with DioMixin {
   AppDio([BaseOptions? options]) {
     this.options = options ?? BaseOptions();
     interceptors.add(MyLogInterceptor());
-    httpClientAdapter = IOHttpClientAdapter(createHttpClient: createHttpClient);
+    httpClientAdapter = RHttpAdapter(const rhttp.ClientSettings());
     interceptors.add(CookieManagerSql(SingleInstanceCookieJar.instance!));
     interceptors.add(NetworkCacheManager());
     interceptors.add(CloudflareInterceptor());
@@ -136,8 +136,9 @@ class AppDio with DioMixin {
   static String? proxy;
 
   static Future<String?> getProxy() async {
-    if ((appdata.settings['proxy'] as String).removeAllBlank == "direct")
+    if ((appdata.settings['proxy'] as String).removeAllBlank == "direct") {
       return null;
+    }
     if (appdata.settings['proxy'] != "system") return appdata.settings['proxy'];
 
     String res;
@@ -187,10 +188,13 @@ class AppDio with DioMixin {
   }) async {
     proxy = await getProxy();
     if (_proxy != proxy) {
+      Log.info("Network", "Proxy changed to $proxy");
       _proxy = proxy;
-      (httpClientAdapter as IOHttpClientAdapter).close();
-      httpClientAdapter =
-          IOHttpClientAdapter(createHttpClient: createHttpClient);
+      httpClientAdapter = RHttpAdapter(rhttp.ClientSettings(
+        proxySettings: proxy == null
+            ? const rhttp.ProxySettings.noProxy()
+            : rhttp.ProxySettings.proxy(proxy!),
+      ));
     }
     Log.info(
       "Network",
@@ -209,3 +213,81 @@ class AppDio with DioMixin {
     );
   }
 }
+
+class RHttpAdapter implements HttpClientAdapter {
+  rhttp.ClientSettings settings;
+
+  RHttpAdapter(this.settings) {
+    settings.copyWith(
+      redirectSettings: const rhttp.RedirectSettings.limited(5),
+      timeoutSettings: const rhttp.TimeoutSettings(
+        connectTimeout: Duration(seconds: 15),
+        keepAliveTimeout: Duration(seconds: 60),
+        keepAlivePing: Duration(seconds: 30),
+      ),
+      httpVersionPref: rhttp.HttpVersionPref.http1_1,
+    );
+  }
+
+  @override
+  void close({bool force = false}) {}
+
+  @override
+  Future<ResponseBody> fetch(
+    RequestOptions options,
+    Stream<Uint8List>? requestStream,
+    Future<void>? cancelFuture,
+  ) async {
+    var res = await rhttp.Rhttp.request(
+      method: switch (options.method) {
+        'GET' => rhttp.HttpMethod.get,
+        'POST' => rhttp.HttpMethod.post,
+        'PUT' => rhttp.HttpMethod.put,
+        'PATCH' => rhttp.HttpMethod.patch,
+        'DELETE' => rhttp.HttpMethod.delete,
+        'HEAD' => rhttp.HttpMethod.head,
+        'OPTIONS' => rhttp.HttpMethod.options,
+        'TRACE' => rhttp.HttpMethod.trace,
+        'CONNECT' => rhttp.HttpMethod.connect,
+        _ => throw ArgumentError('Unsupported method: ${options.method}'),
+      },
+      url: options.uri.toString(),
+      settings: settings,
+      expectBody: rhttp.HttpExpectBody.stream,
+      body: requestStream == null ? null : rhttp.HttpBody.stream(requestStream),
+      headers: rhttp.HttpHeaders.rawMap(
+        Map.fromEntries(
+          options.headers.entries.map(
+            (e) => MapEntry(e.key, e.value.toString().trim()),
+          ),
+        ),
+      ),
+    );
+    if (res is! rhttp.HttpStreamResponse) {
+      throw Exception("Invalid response type: ${res.runtimeType}");
+    }
+    var headers = <String, List<String>>{};
+    for (var entry in res.headers) {
+      var key = entry.$1.toLowerCase();
+      headers[key] ??= [];
+      headers[key]!.add(entry.$2);
+    }
+    var data = res.body;
+    if(headers['content-encoding']?.contains('gzip') ?? false) {
+      // rhttp does not support gzip decoding
+      var buffer = <int>[];
+      await for (var chunk in data) {
+        buffer.addAll(chunk);
+      }
+      data = Stream.value(Uint8List.fromList(gzip.decode(buffer)));
+      buffer.clear();
+    }
+    return ResponseBody(
+      data,
+      res.statusCode,
+      statusMessage: null,
+      isRedirect: false,
+      headers: headers,
+    );
+  }
+}
diff --git a/lib/network/download.dart b/lib/network/download.dart
index 052a8c0..f0c3748 100644
--- a/lib/network/download.dart
+++ b/lib/network/download.dart
@@ -1,6 +1,7 @@
 import 'dart:async';
 
 import 'package:flutter/widgets.dart' show ChangeNotifier;
+import 'package:venera/foundation/appdata.dart';
 import 'package:venera/foundation/comic_source/comic_source.dart';
 import 'package:venera/foundation/comic_type.dart';
 import 'package:venera/foundation/local.dart';
@@ -155,7 +156,7 @@ class ImagesDownloadTask extends DownloadTask with _TransferSpeedMixin {
 
   var tasks = <int, _ImageDownloadWrapper>{};
 
-  int get _maxConcurrentTasks => 5;
+  int get _maxConcurrentTasks => (appdata.settings["downloadThreads"] as num).toInt();
 
   void _scheduleTasks() {
     var images = _images![_images!.keys.elementAt(_chapter)]!;
diff --git a/lib/network/images.dart b/lib/network/images.dart
index ea887bd..29c9005 100644
--- a/lib/network/images.dart
+++ b/lib/network/images.dart
@@ -3,6 +3,7 @@ import 'dart:typed_data';
 import 'package:venera/foundation/cache_manager.dart';
 import 'package:venera/foundation/comic_source/comic_source.dart';
 import 'package:venera/foundation/consts.dart';
+import 'package:venera/utils/image.dart';
 
 import 'app_dio.dart';
 
@@ -27,8 +28,8 @@ class ImageDownloader {
       configs = comicSource?.getThumbnailLoadingConfig?.call(url) ?? {};
     }
     configs['headers'] ??= {};
-    if(configs['headers']['user-agent'] == null
-        && configs['headers']['User-Agent'] == null) {
+    if (configs['headers']['user-agent'] == null &&
+        configs['headers']['User-Agent'] == null) {
       configs['headers']['user-agent'] = webUA;
     }
 
@@ -120,11 +121,22 @@ class ImageDownloader {
       buffer = configs['onResponse'](buffer);
     }
 
-    await CacheManager().writeCache(cacheKey, buffer);
+    var data = Uint8List.fromList(buffer);
+    buffer.clear();
+
+    if (configs['modifyImage'] != null) {
+      var newData = await modifyImageWithScript(
+        data,
+        configs['modifyImage'],
+      );
+      data = newData;
+    }
+
+    await CacheManager().writeCache(cacheKey, data);
     yield ImageDownloadProgress(
-      currentBytes: buffer.length,
-      totalBytes: buffer.length,
-      imageBytes: Uint8List.fromList(buffer),
+      currentBytes: data.length,
+      totalBytes: data.length,
+      imageBytes: data,
     );
   }
 }
diff --git a/lib/pages/comic_page.dart b/lib/pages/comic_page.dart
index 7db2886..3488b66 100644
--- a/lib/pages/comic_page.dart
+++ b/lib/pages/comic_page.dart
@@ -1576,7 +1576,7 @@ class _SelectDownloadChapterState extends State<_SelectDownloadChapter> {
                 const SizedBox(width: 16),
                 Expanded(
                   child: FilledButton(
-                    onPressed: () {
+                    onPressed: selected.isEmpty ? null : () {
                       widget.finishSelect(selected);
                       context.pop();
                     },
@@ -1587,7 +1587,7 @@ class _SelectDownloadChapterState extends State<_SelectDownloadChapter> {
               ],
             ),
           ),
-          SizedBox(height: MediaQuery.of(context).padding.bottom + 4),
+          SizedBox(height: MediaQuery.of(context).padding.bottom),
         ],
       ),
     );
diff --git a/lib/pages/comic_source_page.dart b/lib/pages/comic_source_page.dart
index 5710473..95c5f67 100644
--- a/lib/pages/comic_source_page.dart
+++ b/lib/pages/comic_source_page.dart
@@ -14,11 +14,11 @@ import 'package:venera/utils/translations.dart';
 class ComicSourcePage extends StatefulWidget {
   const ComicSourcePage({super.key});
 
-  static void checkComicSourceUpdate([bool showLoading = false]) async {
+  static Future<void> checkComicSourceUpdate([bool implicit = false]) async {
     if (ComicSource.all().isEmpty) {
       return;
     }
-    var controller = showLoading ? showLoadingDialog(App.rootContext) : null;
+    var controller = implicit ? null : showLoadingDialog(App.rootContext);
     var dio = AppDio();
     var res = await dio.get<String>(
         "https://raw.githubusercontent.com/venera-app/venera-configs/master/index.json");
@@ -40,7 +40,9 @@ class ComicSourcePage extends StatefulWidget {
     }
     controller?.close();
     if (shouldUpdate.isEmpty) {
-      App.rootContext.showMessage(message: "No Update Available".tl);
+      if(!implicit) {
+        App.rootContext.showMessage(message: "No Update Available".tl);
+      }
       return;
     }
     var msg = "";
@@ -48,10 +50,11 @@ class ComicSourcePage extends StatefulWidget {
       msg += "${ComicSource.find(key)?.name}: v${versions[key]}\n";
     }
     msg = msg.trim();
-    showConfirmDialog(
+    await showConfirmDialog(
       context: App.rootContext,
       title: "Updates Available".tl,
       content: msg,
+      confirmText: "Update",
       onConfirm: () {
         for (var key in shouldUpdate) {
           var source = ComicSource.find(key);
@@ -104,7 +107,7 @@ class _BodyState extends State<_Body> {
       child: ListTile(
         leading: const Icon(Icons.update_outlined),
         title: Text("Check updates".tl),
-        onTap: () => ComicSourcePage.checkComicSourceUpdate(true),
+        onTap: () => ComicSourcePage.checkComicSourceUpdate(false),
         trailing: const Icon(Icons.arrow_right),
       ),
     );
@@ -161,71 +164,76 @@ class _BodyState extends State<_Body> {
     for (var item in source.settings!.entries) {
       var key = item.key;
       String type = item.value['type'];
-      if (type == "select") {
-        var current = source.data['settings'][key];
-        if (current == null) {
-          var d = item.value['default'];
-          for (var option in item.value['options']) {
-            if (option['value'] == d) {
-              current = option['text'] ?? option['value'];
-              break;
+      try {
+        if (type == "select") {
+          var current = source.data['settings'][key];
+          if (current == null) {
+            var d = item.value['default'];
+            for (var option in item.value['options']) {
+              if (option['value'] == d) {
+                current = option['text'] ?? option['value'];
+                break;
+              }
             }
           }
+          yield ListTile(
+            title: Text((item.value['title'] as String).ts(source.key)),
+            trailing: Select(
+              current: (current as String).ts(source.key),
+              values: (item.value['options'] as List)
+                  .map<String>(
+                      (e) => ((e['text'] ?? e['value']) as String).ts(source.key))
+                  .toList(),
+              onTap: (i) {
+                source.data['settings'][key] = item.value['options'][i]['value'];
+                source.saveData();
+                setState(() {});
+              },
+            ),
+          );
+        } else if (type == "switch") {
+          var current = source.data['settings'][key] ?? item.value['default'];
+          yield ListTile(
+            title: Text((item.value['title'] as String).ts(source.key)),
+            trailing: Switch(
+              value: current,
+              onChanged: (v) {
+                source.data['settings'][key] = v;
+                source.saveData();
+                setState(() {});
+              },
+            ),
+          );
+        } else if (type == "input") {
+          var current =
+              source.data['settings'][key] ?? item.value['default'] ?? '';
+          yield ListTile(
+            title: Text((item.value['title'] as String).ts(source.key)),
+            subtitle: Text(current, maxLines: 1, overflow: TextOverflow.ellipsis),
+            trailing: IconButton(
+              icon: const Icon(Icons.edit),
+              onPressed: () {
+                showInputDialog(
+                  context: context,
+                  title: (item.value['title'] as String).ts(source.key),
+                  initialValue: current,
+                  inputValidator: item.value['validator'] == null
+                      ? null
+                      : RegExp(item.value['validator']),
+                  onConfirm: (value) {
+                    source.data['settings'][key] = value;
+                    source.saveData();
+                    setState(() {});
+                    return null;
+                  },
+                );
+              },
+            ),
+          );
         }
-        yield ListTile(
-          title: Text((item.value['title'] as String).ts(source.key)),
-          trailing: Select(
-            current: (current as String).ts(source.key),
-            values: (item.value['options'] as List)
-                .map<String>(
-                    (e) => ((e['text'] ?? e['value']) as String).ts(source.key))
-                .toList(),
-            onTap: (i) {
-              source.data['settings'][key] = item.value['options'][i]['value'];
-              source.saveData();
-              setState(() {});
-            },
-          ),
-        );
-      } else if (type == "switch") {
-        var current = source.data['settings'][key] ?? item.value['default'];
-        yield ListTile(
-          title: Text((item.value['title'] as String).ts(source.key)),
-          trailing: Switch(
-            value: current,
-            onChanged: (v) {
-              source.data['settings'][key] = v;
-              source.saveData();
-              setState(() {});
-            },
-          ),
-        );
-      } else if (type == "input") {
-        var current =
-            source.data['settings'][key] ?? item.value['default'] ?? '';
-        yield ListTile(
-          title: Text((item.value['title'] as String).ts(source.key)),
-          subtitle: Text(current, maxLines: 1, overflow: TextOverflow.ellipsis),
-          trailing: IconButton(
-            icon: const Icon(Icons.edit),
-            onPressed: () {
-              showInputDialog(
-                context: context,
-                title: (item.value['title'] as String).ts(source.key),
-                initialValue: current,
-                inputValidator: item.value['validator'] == null
-                    ? null
-                    : RegExp(item.value['validator']),
-                onConfirm: (value) {
-                  source.data['settings'][key] = value;
-                  source.saveData();
-                  setState(() {});
-                  return null;
-                },
-              );
-            },
-          ),
-        );
+      }
+      catch(e, s) {
+        Log.error("ComicSourcePage", "Failed to build a setting\n$e\n$s");
       }
     }
   }
@@ -446,10 +454,11 @@ class _ComicSourceListState extends State<_ComicSourceList> {
         itemBuilder: (context, index) {
           var key = json![index]["key"];
           var action = currentKey.contains(key)
-              ? const Icon(Icons.check)
+              ? const Icon(Icons.check, size: 20).paddingRight(8)
               : Tooltip(
                   message: "Add",
-                  child: IconButton(
+                  child: Button.icon(
+                    color: context.colorScheme.primary,
                     icon: const Icon(Icons.add),
                     onPressed: () async {
                       await widget.onAdd(
diff --git a/lib/pages/reader/images.dart b/lib/pages/reader/images.dart
index f1c427f..578b893 100644
--- a/lib/pages/reader/images.dart
+++ b/lib/pages/reader/images.dart
@@ -223,6 +223,9 @@ class _GalleryModeState extends State<_GalleryMode>
 
   @override
   void handleLongPressDown(Offset location) {
+    if(!appdata.settings['enableLongPressToZoom']) {
+      return;
+    }
     var photoViewController = photoViewControllers[reader.page]!;
     double target = photoViewController.getInitialScale!.call()! * 1.75;
     var size = MediaQuery.of(context).size;
@@ -234,6 +237,9 @@ class _GalleryModeState extends State<_GalleryMode>
 
   @override
   void handleLongPressUp(Offset location) {
+    if(!appdata.settings['enableLongPressToZoom']) {
+      return;
+    }
     var photoViewController = photoViewControllers[reader.page]!;
     double target = photoViewController.getInitialScale!.call()!;
     photoViewController.animateScale?.call(target);
@@ -509,6 +515,9 @@ class _ContinuousModeState extends State<_ContinuousMode>
 
   @override
   void handleLongPressDown(Offset location) {
+    if(!appdata.settings['enableLongPressToZoom']) {
+      return;
+    }
     double target = photoViewController.getInitialScale!.call()! * 1.75;
     var size = MediaQuery.of(context).size;
     photoViewController.animateScale?.call(
@@ -519,6 +528,9 @@ class _ContinuousModeState extends State<_ContinuousMode>
 
   @override
   void handleLongPressUp(Offset location) {
+    if(!appdata.settings['enableLongPressToZoom']) {
+      return;
+    }
     double target = photoViewController.getInitialScale!.call()!;
     photoViewController.animateScale?.call(target);
   }
diff --git a/lib/pages/reader/scaffold.dart b/lib/pages/reader/scaffold.dart
index 8353628..598e173 100644
--- a/lib/pages/reader/scaffold.dart
+++ b/lib/pages/reader/scaffold.dart
@@ -393,7 +393,7 @@ class _ReaderScaffoldState extends State<_ReaderScaffold> {
 
   Widget buildPageInfoText() {
     var epName = context.reader.widget.chapters?.values
-            .elementAt(context.reader.chapter - 1) ??
+            .elementAtOrNull(context.reader.chapter - 1) ??
         "E${context.reader.chapter}";
     if (epName.length > 8) {
       epName = "${epName.substring(0, 8)}...";
diff --git a/lib/pages/settings/about.dart b/lib/pages/settings/about.dart
index f9a46da..f68ef69 100644
--- a/lib/pages/settings/about.dart
+++ b/lib/pages/settings/about.dart
@@ -53,30 +53,7 @@ class _AboutSettingsState extends State<AboutSettings> {
               setState(() {
                 isCheckingUpdate = true;
               });
-              checkUpdate().then((value) {
-                if (value) {
-                  showDialog(
-                      context: App.rootContext,
-                      builder: (context) {
-                        return ContentDialog(
-                            title: "New version available".tl,
-                            content: Text(
-                                "A new version is available. Do you want to update now?"
-                                    .tl),
-                            actions: [
-                              Button.text(
-                                onPressed: () {
-                                  Navigator.pop(context);
-                                  launchUrlString(
-                                      "https://github.com/venera-app/venera/releases");
-                                },
-                                child: Text("Update".tl),
-                              ),
-                            ]);
-                      });
-                } else {
-                  context.showMessage(message: "No new version available".tl);
-                }
+              checkUpdateUi().then((value) {
                 setState(() {
                   isCheckingUpdate = false;
                 });
@@ -108,6 +85,33 @@ Future<bool> checkUpdate() async {
   return false;
 }
 
+Future<void> checkUpdateUi([bool showMessageIfNoUpdate = true]) async {
+  var value = await checkUpdate();
+  if (value) {
+    showDialog(
+        context: App.rootContext,
+        builder: (context) {
+          return ContentDialog(
+            title: "New version available".tl,
+            content: Text(
+                "A new version is available. Do you want to update now?".tl),
+            actions: [
+              Button.text(
+                onPressed: () {
+                  Navigator.pop(context);
+                  launchUrlString(
+                      "https://github.com/venera-app/venera/releases");
+                },
+                child: Text("Update".tl),
+              ),
+            ],
+          );
+        });
+  } else if (showMessageIfNoUpdate) {
+    App.rootContext.showMessage(message: "No new version available".tl);
+  }
+}
+
 /// return true if version1 > version2
 bool _compareVersion(String version1, String version2) {
   var v1 = version1.split(".");
diff --git a/lib/pages/settings/network.dart b/lib/pages/settings/network.dart
index 0cc2545..21042ea 100644
--- a/lib/pages/settings/network.dart
+++ b/lib/pages/settings/network.dart
@@ -17,6 +17,13 @@ class _NetworkSettingsState extends State<NetworkSettings> {
           title: "Proxy".tl,
           builder: () => const _ProxySettingView(),
         ).toSliver(),
+        _SliderSetting(
+          title: "Download Threads".tl,
+          settingsIndex: 'downloadThreads',
+          interval: 1,
+          min: 1,
+          max: 16,
+        ).toSliver(),
       ],
     );
   }
@@ -42,50 +49,50 @@ class _ProxySettingViewState extends State<_ProxySettingView> {
 
   // USERNAME:PASSWORD@HOST:PORT
   String toProxyStr() {
-    if(type == 'direct') {
+    if (type == 'direct') {
       return 'direct';
-    } else if(type == 'system') {
+    } else if (type == 'system') {
       return 'system';
     }
     var res = '';
-    if(username.isNotEmpty) {
+    if (username.isNotEmpty) {
       res += username;
-      if(password.isNotEmpty) {
+      if (password.isNotEmpty) {
         res += ':$password';
       }
       res += '@';
     }
     res += host;
-    if(port.isNotEmpty) {
+    if (port.isNotEmpty) {
       res += ':$port';
     }
     return res;
   }
 
   void parseProxyString(String proxy) {
-    if(proxy == 'direct') {
+    if (proxy == 'direct') {
       type = 'direct';
       return;
-    } else if(proxy == 'system') {
+    } else if (proxy == 'system') {
       type = 'system';
       return;
     }
     type = 'manual';
     var parts = proxy.split('@');
-    if(parts.length == 2) {
+    if (parts.length == 2) {
       var auth = parts[0].split(':');
-      if(auth.length == 2) {
+      if (auth.length == 2) {
         username = auth[0];
         password = auth[1];
       }
       parts = parts[1].split(':');
-      if(parts.length == 2) {
+      if (parts.length == 2) {
         host = parts[0];
         port = parts[1];
       }
     } else {
       parts = proxy.split(':');
-      if(parts.length == 2) {
+      if (parts.length == 2) {
         host = parts[0];
         port = parts[1];
       }
@@ -140,7 +147,7 @@ class _ProxySettingViewState extends State<_ProxySettingView> {
                 });
               },
             ),
-            if(type == 'manual') buildManualProxy(),
+            if (type == 'manual') buildManualProxy(),
           ],
         ),
       ),
@@ -164,7 +171,7 @@ class _ProxySettingViewState extends State<_ProxySettingView> {
               host = v;
             },
             validator: (v) {
-              if(v?.isEmpty ?? false) {
+              if (v?.isEmpty ?? false) {
                 return "Host cannot be empty".tl;
               }
               return null;
@@ -181,10 +188,10 @@ class _ProxySettingViewState extends State<_ProxySettingView> {
               port = v;
             },
             validator: (v) {
-              if(v?.isEmpty ?? true) {
+              if (v?.isEmpty ?? true) {
                 return null;
               }
-              if(int.tryParse(v!) == null) {
+              if (int.tryParse(v!) == null) {
                 return "Port must be a number".tl;
               }
               return null;
@@ -201,7 +208,7 @@ class _ProxySettingViewState extends State<_ProxySettingView> {
               username = v;
             },
             validator: (v) {
-              if((v?.isEmpty ?? false) && password.isNotEmpty) {
+              if ((v?.isEmpty ?? false) && password.isNotEmpty) {
                 return "Username cannot be empty".tl;
               }
               return null;
@@ -221,7 +228,7 @@ class _ProxySettingViewState extends State<_ProxySettingView> {
           const SizedBox(height: 16),
           FilledButton(
             onPressed: () {
-              if(formKey.currentState?.validate() ?? false) {
+              if (formKey.currentState?.validate() ?? false) {
                 appdata.settings['proxy'] = toProxyStr();
                 appdata.saveData();
                 App.rootContext.pop();
diff --git a/lib/pages/settings/reader.dart b/lib/pages/settings/reader.dart
index 4704d24..e8cb88d 100644
--- a/lib/pages/settings/reader.dart
+++ b/lib/pages/settings/reader.dart
@@ -54,6 +54,13 @@ class _ReaderSettingsState extends State<ReaderSettings> {
             widget.onChanged?.call("autoPageTurningInterval");
           },
         ).toSliver(),
+        _SwitchSetting(
+          title: 'Long press to zoom'.tl,
+          settingKey: 'enableLongPressToZoom',
+          onChanged: () {
+            widget.onChanged?.call('enableLongPressToZoom');
+          },
+        ).toSliver(),
       ],
     );
   }
diff --git a/lib/utils/image.dart b/lib/utils/image.dart
new file mode 100644
index 0000000..b7488b8
--- /dev/null
+++ b/lib/utils/image.dart
@@ -0,0 +1,316 @@
+import 'dart:ffi';
+import 'dart:isolate';
+import 'dart:typed_data';
+import 'dart:ui' as ui;
+import 'package:flutter/services.dart';
+import 'package:flutter_qjs/flutter_qjs.dart';
+import 'package:lodepng_flutter/lodepng_flutter.dart' as lodepng;
+
+class Image {
+  final Uint32List _data;
+
+  final int width;
+
+  final int height;
+
+  Image(this._data, this.width, this.height) {
+    if (_data.length != width * height) {
+      throw ArgumentError(
+          'Invalid argument: data length must be equal to width * height.');
+    }
+  }
+
+  Image.empty(this.width, this.height) : _data = Uint32List(width * height);
+
+  static Future<Image> decodeImage(Uint8List data) async {
+    var codec = await ui.instantiateImageCodec(data);
+    var frame = await codec.getNextFrame();
+    codec.dispose();
+    var info = await frame.image.toByteData();
+    if (info == null) {
+      throw Exception('Failed to decode image');
+    }
+    var image = Image(
+      info.buffer.asUint32List(),
+      frame.image.width,
+      frame.image.height,
+    );
+    frame.image.dispose();
+    return image;
+  }
+
+  Image copyRange(int x, int y, int width, int height) {
+    if (width + x > this.width) {
+      throw ArgumentError('''
+        Invalid argument: x + width must be less than or equal to the image width.
+        x: $x, width: $width, image width: ${this.width}
+      '''
+          .trim());
+    }
+    if (height + y > this.height) {
+      throw ArgumentError('''
+        Invalid argument: y + height must be less than or equal to the image height.
+        y: $y, height: $height, image height: ${this.height}
+      '''
+          .trim());
+    }
+    var data = Uint32List(width * height);
+    for (var j = 0; j < height; j++) {
+      for (var i = 0; i < width; i++) {
+        data[j * width + i] = _data[(j + y) * this.width + i + x];
+      }
+    }
+    return Image(data, width, height);
+  }
+
+  void fillImageAt(int x, int y, Image image) {
+    if (x + image.width > width) {
+      throw ArgumentError('''
+        Invalid argument: x + image width must be less than or equal to the image width.
+        x: $x, image width: ${image.width}, image width: $width
+      '''
+          .trim());
+    }
+    if (y + image.height > height) {
+      throw ArgumentError('''
+        Invalid argument: y + image height must be less than or equal to the image height.
+        y: $y, image height: ${image.height}, image height: $height
+      '''
+          .trim());
+    }
+    for (var j = 0; j < image.height && (j + y) < height; j++) {
+      for (var i = 0; i < image.width && (i + x) < width; i++) {
+        _data[(j + y) * width + i + x] = image._data[j * image.width + i];
+      }
+    }
+  }
+
+  void fillImageRangeAt(
+      int x, int y, Image image, int srcX, int srcY, int width, int height) {
+    if (x + width > this.width) {
+      throw ArgumentError('''
+        Invalid argument: x + width must be less than or equal to the image width.
+        x: $x, width: $width, image width: ${this.width}
+      '''
+          .trim());
+    }
+    if (y + height > this.height) {
+      throw ArgumentError('''
+        Invalid argument: y + height must be less than or equal to the image height.
+        y: $y, height: $height, image height: ${this.height}
+      '''
+          .trim());
+    }
+    if (srcX + width > image.width) {
+      throw ArgumentError('''
+        Invalid argument: srcX + width must be less than or equal to the image width.
+        srcX: $srcX, width: $width, image width: ${image.width}
+      '''
+          .trim());
+    }
+    if (srcY + height > image.height) {
+      throw ArgumentError('''
+        Invalid argument: srcY + height must be less than or equal to the image height.
+        srcY: $srcY, height: $height, image height: ${image.height}
+      '''
+          .trim());
+    }
+    for (var j = 0; j < height; j++) {
+      for (var i = 0; i < width; i++) {
+        _data[(j + y) * this.width + i + x] =
+            image._data[(j + srcY) * image.width + i + srcX];
+      }
+    }
+  }
+
+  Image copyAndRotate90() {
+    var data = Uint32List(width * height);
+    for (var j = 0; j < height; j++) {
+      for (var i = 0; i < width; i++) {
+        data[i * height + height - j - 1] = _data[j * width + i];
+      }
+    }
+    return Image(data, height, width);
+  }
+
+  Color getPixel(int x, int y) {
+    if (x < 0 || x >= width) {
+      throw ArgumentError(
+          'Invalid argument: x must be in the range of [0, $width).');
+    }
+    if (y < 0 || y >= height) {
+      throw ArgumentError(
+          'Invalid argument: y must be in the range of [0, $height).');
+    }
+    return Color.fromValue(_data[y * width + x]);
+  }
+
+  void setPixel(int x, int y, Color color) {
+    if (x < 0 || x >= width) {
+      throw ArgumentError(
+          'Invalid argument: x must be in the range of [0, $width).');
+    }
+    if (y < 0 || y >= height) {
+      throw ArgumentError(
+          'Invalid argument: y must be in the range of [0, $height).');
+    }
+    _data[y * width + x] = color.value;
+  }
+
+  Uint8List encodePng() {
+    var data = lodepng.encodePngToPointer(lodepng.Image(
+      _data.buffer.asUint8List(),
+      width,
+      height,
+    ));
+    return Pointer<Uint8>.fromAddress(data.address).asTypedList(data.length,
+        finalizer: lodepng.ByteBuffer.finalizer);
+  }
+}
+
+class Color {
+  final int value;
+
+  Color(int r, int g, int b, [int a = 255])
+      : value = (a << 24) | (r << 16) | (g << 8) | b;
+
+  Color.fromValue(this.value);
+
+  int get r => (value >> 16) & 0xFF;
+
+  int get g => (value >> 8) & 0xFF;
+
+  int get b => value & 0xFF;
+
+  int get a => (value >> 24) & 0xFF;
+}
+
+class JsEngine {
+  static final JsEngine _instance = JsEngine._();
+
+  factory JsEngine() => _instance;
+
+  JsEngine._() {
+    _engine = FlutterQjs();
+    _engine!.dispatch();
+    var setGlobalFunc =
+        _engine!.evaluate("(key, value) => { this[key] = value; }");
+    (setGlobalFunc as JSInvokable)(["sendMessage", _messageReceiver]);
+    setGlobalFunc.free();
+  }
+
+  FlutterQjs? _engine;
+
+  dynamic runCode(String js, [String? name]) {
+    return _engine!.evaluate(js, name: name);
+  }
+
+  var images = <int, Image>{};
+
+  int _key = 0;
+
+  int setImage(Image image) {
+    var key = _key++;
+    images[key] = image;
+    return key;
+  }
+
+  Object? _messageReceiver(dynamic message) {
+    if (message is! Map) return null;
+    var method = message['method'];
+    if (method == 'image') {
+      switch (message['function']) {
+        case 'copyRange':
+          var key = message['key'];
+          var image = images[key];
+          if (image == null) return null;
+          var x = message['x'];
+          var y = message['y'];
+          var width = message['width'];
+          var height = message['height'];
+          var newImage = image.copyRange(x, y, width, height);
+          return setImage(newImage);
+        case 'copyAndRotate90':
+          var key = message['key'];
+          var image = images[key];
+          if (image == null) return null;
+          var newImage = image.copyAndRotate90();
+          return setImage(newImage);
+        case 'fillImageAt':
+          var key = message['key'];
+          var image = images[key];
+          if (image == null) return null;
+          var x = message['x'];
+          var y = message['y'];
+          var key2 = message['image'];
+          var image2 = images[key2];
+          if (image2 == null) return null;
+          image.fillImageAt(x, y, image2);
+          return null;
+        case 'fillImageRangeAt':
+          var key = message['key'];
+          var image = images[key];
+          if (image == null) return null;
+          var x = message['x'];
+          var y = message['y'];
+          var key2 = message['image'];
+          var image2 = images[key2];
+          if (image2 == null) return null;
+          var srcX = message['srcX'];
+          var srcY = message['srcY'];
+          var width = message['width'];
+          var height = message['height'];
+          image.fillImageRangeAt(x, y, image2, srcX, srcY, width, height);
+          return null;
+        case 'getWidth':
+          var key = message['key'];
+          var image = images[key];
+          if (image == null) return null;
+          return image.width;
+        case 'getHeight':
+          var key = message['key'];
+          var image = images[key];
+          if (image == null) return null;
+          return image.height;
+        case 'emptyImage':
+          var width = message['width'];
+          var height = message['height'];
+          var newImage = Image.empty(width, height);
+          return setImage(newImage);
+      }
+    }
+    return null;
+  }
+}
+
+var _tasksCount = 0;
+
+Future<Uint8List> modifyImageWithScript(Uint8List data, String script) async {
+  while (_tasksCount > 3) {
+    await Future.delayed(const Duration(milliseconds: 200));
+  }
+  _tasksCount++;
+  try {
+    var image = await Image.decodeImage(data);
+    var initJs = await rootBundle.loadString('assets/init.js');
+    return await Isolate.run(() {
+      var jsEngine = JsEngine();
+      jsEngine.runCode(initJs, '<init>');
+      jsEngine.runCode(script);
+      var key = jsEngine.setImage(image);
+      var res = jsEngine.runCode('''
+        let func = () => {
+          let image = new Image($key);
+          let result = modifyImage(image);
+          return result.key;
+        }
+        func();
+      ''');
+      var newImage = jsEngine.images[res];
+      var data = newImage!.encodePng();
+      return Uint8List.fromList(data);
+    });
+  } finally {
+    _tasksCount--;
+  }
+}
diff --git a/linux/flutter/generated_plugins.cmake b/linux/flutter/generated_plugins.cmake
index c0fb5f6..819bf88 100644
--- a/linux/flutter/generated_plugins.cmake
+++ b/linux/flutter/generated_plugins.cmake
@@ -14,6 +14,8 @@ list(APPEND FLUTTER_PLUGIN_LIST
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST
+  lodepng_flutter
+  rhttp
   zip_flutter
 )
 
diff --git a/pubspec.lock b/pubspec.lock
index 623cf1d..fdf85c8 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -57,6 +57,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
+  build_cli_annotations:
+    dependency: transitive
+    description:
+      name: build_cli_annotations
+      sha256: b59d2769769efd6c9ff6d4c4cede0be115a566afc591705c2040b707534b1172
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
   characters:
     dependency: transitive
     description:
@@ -341,6 +349,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.0.1"
+  flutter_rust_bridge:
+    dependency: transitive
+    description:
+      name: flutter_rust_bridge
+      sha256: "5fe868d3cb8cbc4d83091748552e03f00ccfa41b8e44691bc382611f831d5f8b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.1"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -368,6 +384,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  freezed_annotation:
+    dependency: transitive
+    description:
+      name: freezed_annotation
+      sha256: c2e2d632dd9b8a2b7751117abcfc2b4888ecfe181bd9fca7170d9ef02e595fe2
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.4"
   gtk:
     dependency: transitive
     description:
@@ -424,6 +448,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.1"
+  json_annotation:
+    dependency: transitive
+    description:
+      name: json_annotation
+      sha256: "1ce844379ca14835a50d2f019a3099f419082cfdd231cd86a142af94dd5c6bb1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.9.0"
   leak_tracker:
     dependency: transitive
     description:
@@ -456,6 +488,15 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.0"
+  lodepng_flutter:
+    dependency: "direct main"
+    description:
+      path: "."
+      ref: d1c96cd6503103b3270dfe2f320d4a1c93780f53
+      resolved-ref: d1c96cd6503103b3270dfe2f320d4a1c93780f53
+      url: "https://github.com/venera-app/lodepng_flutter"
+    source: git
+    version: "0.0.1"
   matcher:
     dependency: transitive
     description:
@@ -585,6 +626,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.9.1"
+  rhttp:
+    dependency: "direct main"
+    description:
+      name: rhttp
+      sha256: "92fb57dea6338370efe1e4e2101e8b521f91f15bc60ef6908469b4392dd9803a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.9.1"
   screen_retriever:
     dependency: transitive
     description:
@@ -849,5 +898,5 @@ packages:
     source: git
     version: "0.0.1"
 sdks:
-  dart: ">=3.5.0 <4.0.0"
+  dart: ">=3.5.4 <4.0.0"
   flutter: ">=3.24.4"
diff --git a/pubspec.yaml b/pubspec.yaml
index fb39da7..c71cbf9 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -2,7 +2,7 @@ name: venera
 description: "A comic app."
 publish_to: 'none'
 
-version: 1.0.1+101
+version: 1.0.2+102
 
 environment:
   sdk: '>=3.5.0 <4.0.0'
@@ -54,6 +54,11 @@ dependencies:
   zip_flutter:
     git:
       url: https://github.com/wgh136/zip_flutter
+  lodepng_flutter:
+    git:
+      url: https://github.com/venera-app/lodepng_flutter
+      ref: d1c96cd6503103b3270dfe2f320d4a1c93780f53
+  rhttp: 0.9.1
 
 dev_dependencies:
   flutter_test:
diff --git a/windows/build.iss b/windows/build.iss
index 949b5d0..905d0cf 100644
--- a/windows/build.iss
+++ b/windows/build.iss
@@ -54,6 +54,7 @@ Source: "{#RootPath}\build\windows\x64\runner\Release\url_launcher_windows_plugi
 Source: "{#RootPath}\build\windows\x64\runner\Release\screen_retriever_plugin.dll"; DestDir: "{app}"; Flags: ignoreversion
 Source: "{#RootPath}\build\windows\x64\runner\Release\window_manager_plugin.dll"; DestDir: "{app}"; Flags: ignoreversion
 Source: "{#RootPath}\build\windows\x64\runner\Release\zip_flutter.dll"; DestDir: "{app}"; Flags: ignoreversion
+Source: "{#RootPath}\build\windows\x64\runner\Release\rhttp.dll"; DestDir: "{app}"; Flags: ignoreversion
 Source: "{#RootPath}\build\windows\x64\runner\Release\data\*"; DestDir: "{app}\data"; Flags: ignoreversion recursesubdirs createallsubdirs
 ; NOTE: Don't use "Flags: ignoreversion" on any shared system files
 
diff --git a/windows/flutter/generated_plugins.cmake b/windows/flutter/generated_plugins.cmake
index 693c576..d92ca11 100644
--- a/windows/flutter/generated_plugins.cmake
+++ b/windows/flutter/generated_plugins.cmake
@@ -16,6 +16,8 @@ list(APPEND FLUTTER_PLUGIN_LIST
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST
+  lodepng_flutter
+  rhttp
   zip_flutter
 )