[Impeller] Picture/Layer toImage doesn't work when application is backgrounded on iOS. #146990
Description
Overview
As the title suggests, when I run certain functions in the background, I get an Exception: operation failed exception. Where the same crashes as reported in #135245 occurred, this exception could also occur. This issue has a higher number of crashes in Firebase Crashlytics.
Steps to reproduce
- Run the sample code
- Tap the
Text Button - Go to background
Expected results
No crash occurs.
Actual results
The following exception occurs.
Debug service listening on ws://127.0.0.1:54190/m3UsC57y-70=/ws
Syncing files to device iPhone 14 Pro Max...
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Exception: operation failed
sample code
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
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 StatelessWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextButton(
onPressed: () async {
// Waiting to return to BACK GROUND
await Future.delayed(const Duration(seconds: 3));
final ui.PictureRecorder recorder = ui.PictureRecorder();
final ui.Canvas canvas = ui.Canvas(recorder);
canvas.scale(100, 100);
final ui.Picture scaledPicture = recorder.endRecording();
// Crashes when this line runs in the background
ui.Image image = await scaledPicture.toImage(
100,
100,
);
},
child: const Text('Text Button'),
),
],
),
),
);
}
}
flutter doctor -v
flutter doctor -v
[✓] Flutter (Channel stable, 3.19.2, on macOS 13.4 22F66 darwin-arm64, locale ja-JP)
• Flutter version 3.19.2 on channel stable at /Users/01036096/fvm/versions/3.19.2
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 7482962148 (7 weeks ago), 2024-02-27 16:51:22 -0500
• Engine revision 04817c99c9
• Dart version 3.3.0
• DevTools version 2.31.1
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
• Android SDK at /Users/01036096/Library/Android/sdk
• Platform android-33, build-tools 33.0.2
• ANDROID_HOME = /Users/01036096/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 14.1)
• Xcode at /Applications/Xcode14.1.app/Contents/Developer
• Build 14B47b
• CocoaPods version 1.15.2
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2022.2)
• 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 17.0.6+0-17.0.6b802.4-9586694)
[✓] VS Code (version 1.87.2)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.86.0
[✓] Connected device (3 available)
• iPhone 14 Pro Max (mobile) • 08DFB7BD-01AA-45DC-A8F3-9F61D45007E3 • ios • com.apple.CoreSimulator.SimRuntime.iOS-17-0 (simulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 13.4 22F66 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 123.0.6312.124
[✓] Network resources
• All expected network resources are available.
• No issues found!