[IOS]Image.toByteData() is super slow on Flutter 3 #106773
Description
await image.toByteData(format: ImageByteFormat.png);image.toByteData time consuming in flutter 2.10.5 and flutter 3.0.3, only in iOS
Steps to Reproduce
- Execute
flutter runon the code sample - in •flutter 2.10.5, • Dart version 2.16.2 • DevTools version 2.9.2 , total time is 1219ms
- in •flutter 3.0.3, • Dart version 2.17.5 • DevTools version 2.12.2 , total time is 8942ms
Expected results: The total time should be about the same
Actual results: 847ms and 8942ms, nearly eight times the difference! Even the real machine in release runs very very slow，eight times the difference!.
Code sample
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final GlobalKey sharePageKey = GlobalKey();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: RepaintBoundary(
key: sharePageKey,
child: Column(
children: [
Text(List.generate(200, (index) => "Text").join("#")),
Image.network(
"http://pic1.win4000.com/wallpaper/2020-10-10/5f811214aa09e.jpg",
width: double.infinity,
),
],
),
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
createImage();
},
child: const Text("create"),
),
);
}
createImage() async {
debugPrint("tim0 ${DateTime.now()}");
DateTime start = DateTime.now();
BuildContext? buildContext = sharePageKey.currentContext;
if (null != buildContext) {
RenderRepaintBoundary boundary =
buildContext.findRenderObject() as RenderRepaintBoundary;
ui.Image image = await boundary.toImage(pixelRatio: 5);
debugPrint("tim1 ${DateTime.now()}");
ByteData? byteData = await image.toByteData(format: ImageByteFormat.png);
debugPrint("tim2 ${DateTime.now()}");
if (byteData != null) {
var pngBytes = byteData.buffer.asUint8List();
debugPrint("tim3 ${DateTime.now()}");
debugPrint(
"total ${DateTime.now().millisecondsSinceEpoch - start.millisecondsSinceEpoch}");
}
}
}
}Logs
flutter: tim0 2022-06-29 10:58:55.542207
flutter: tim1 2022-06-29 10:58:55.621826
flutter: tim2 2022-06-29 10:58:56.764545
flutter: tim3 2022-06-29 10:58:56.764890
flutter: total 1219
[✓] Flutter (Channel unknown, 2.10.5, on macOS 12.3.1 21E258 darwin-x64, locale zh-Hans-CN)
• Flutter version 2.10.5 at /Users/sunhao/Documents/developer/flutter
• Upstream repository unknown
• Framework revision 5464c5bac7 (2 months ago), 2022-04-18 09:55:37 -0700
• Engine revision 57d3bac3dd
• Dart version 2.16.2
• DevTools version 2.9.2
• Pub download mirror https://mirrors.tuna.tsinghua.edu.cn/dart-pub
• Flutter download mirror https://mirrors.tuna.tsinghua.edu.cn/flutter
[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
• Android SDK at /Users/sunhao/Documents/developer/Android/sdk
• Platform android-32, build-tools 32.0.0
• ANDROID_HOME = /Users/sunhao/Documents/developer/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 13.3.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• CocoaPods version 1.11.3
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2021.2)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
[✓] VS Code (version 1.68.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension can be installed from:
🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[✓] Connected device (2 available)
• iPhone 12 (mobile) • 9A3514D1-1F7A-4114-BEFF-9609739BE58C • ios • com.apple.CoreSimulator.SimRuntime.iOS-15-4 (simulator)
• Chrome (web) • chrome • web-javascript • Google Chrome 103.0.5060.53
! Error: ssyzh-iPhone is not connected. Xcode will continue when ssyzh-iPhone is connected. (code -13)
[✓] HTTP Host Availability
• All required HTTP hosts are available
• No issues found!
flutter: tim0 2022-06-29 10:37:19.759706
flutter: tim1 2022-06-29 10:37:19.865037
flutter: tim2 2022-06-29 10:37:28.702424
flutter: tim3 2022-06-29 10:37:28.703828
flutter: total 8942
[✓] Flutter (Channel stable, 3.0.3, on macOS 12.3.1 21E258 darwin-x64, locale zh-Hans-CN)
• Flutter version 3.0.3 at /Users/sunhao/Documents/developer/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 676cefaaff (6 days ago), 2022-06-22 11:34:49 -0700
• Engine revision ffe7b86a1e
• Dart version 2.17.5
• DevTools version 2.12.2
• Pub download mirror https://mirrors.tuna.tsinghua.edu.cn/dart-pub
• Flutter download mirror https://mirrors.tuna.tsinghua.edu.cn/flutter
[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
• Android SDK at /Users/sunhao/Documents/developer/Android/sdk
• Platform android-32, build-tools 32.0.0
• ANDROID_HOME = /Users/sunhao/Documents/developer/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 13.3.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• CocoaPods version 1.11.3
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2021.2)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.12+0-b1504.28-7817840)
[✓] VS Code (version 1.68.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension can be installed from:
🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[✓] Connected device (4 available)
• ssyzh-iPhone (mobile) • 00008020-000371162EC1002E • ios • iOS 15.2.1 19C63
• iPhone 12 (mobile) • 9A3514D1-1F7A-4114-BEFF-9609739BE58C • ios • com.apple.CoreSimulator.SimRuntime.iOS-15-4 (simulator)
• macOS (desktop) • macos • darwin-x64 • macOS 12.3.1 21E258 darwin-x64
• Chrome (web) • chrome • web-javascript • Google Chrome 103.0.5060.53
[✓] HTTP Host Availability
• All required HTTP hosts are available
• No issues found!
Process finished with exit code 0