Widget to image(screenshot) not working properly on Flutter Web CanvasKit version with Flutter 3. #103612
Description
##Issue
Widget to image not working properly on Flutter Web CanvasKit version with Flutter 3. Basically, the Image widget became invisible from the screenshot/generated image. While other widgets are captured properly.
Steps to Reproduce
Run flutter run -d Chrome --web-renderer canvaskit using the following code.
Try to capture an image with save FAB.
Expected results: Expected result Image should be captured as it looks on the UI. It should available on the bottom of the red container.
Actual results: Image gets captured properly but the image widget is missing in the captured image.
Code sample
import 'dart:typed_data';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'dart:ui' as ui;
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 Image Capture Bug',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key}) : super(key: key);
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final key = GlobalKey();
Uint8List? imageBytes;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Flutter Image Capture Bug'),
),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.save),
onPressed: () async {
imageBytes = await captureImage();
setState((){
});
},
),
body: ListView(
children: [
Center(
child: RepaintBoundary(
key: key,
child: Row(
mainAxisSize: MainAxisSize.min,
children: [
Container(
height: 300,
width: 200,
color: Colors.red,
),
Image.network(
"https://picsum.photos/200/300",
height: 300,
width: 200,
),
],
),
),
),
if(imageBytes != null)
Center(
child: Card(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
const Text("Capture Image"),
Padding(
padding: const EdgeInsets.all(8.0),
child: Image.memory(imageBytes!),
),
],
),
),
)
],
),
);
}
Future<Uint8List?> captureImage() async {
double pixelRatio = 5;
try {
RenderRepaintBoundary? boundary =
key.currentContext?.findRenderObject() as RenderRepaintBoundary?;
ui.Image? image = await boundary?.toImage(pixelRatio: pixelRatio);
ByteData? byteData =
await image?.toByteData(format: ui.ImageByteFormat.png);
Uint8List? pngBytes = byteData?.buffer.asUint8List();
return pngBytes;
} catch (e) {
debugPrint("$e");
return null;
}
}
}
Logs
Analyzing test_image_capture_web...
No issues found! (ran in 1.4s)
[✓] Flutter (Channel stable, 3.0.0, on macOS 12.3.1 21E258 darwin-arm, locale en-US)
• Flutter version 3.0.0 at /Users/shofiul/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision ee4e09cce0 (3 days ago), 2022-05-09 16:45:18 -0700
• Engine revision d1b9a6938a
• Dart version 2.17.0
• DevTools version 2.12.2
[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
• Android SDK at /Users/shofiul/Library/Android/sdk
• Platform android-31, build-tools 31.0.0
• Java binary at: /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (Zulu 8.60.0.21-CA-macos-aarch64) (build 1.8.0_322-b06)
• 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 2021.1)
• 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 11.0.11+0-b60-7772763)
[✓] Android Studio (version 2021.2)
• Android Studio at /Users/shofiul/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-2/212.5712.43.2112.8403254/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)
[!] Android Studio
• Android Studio at /Users/shofiul/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-2/212.5712.43.2112.8233820/Android Studio Preview.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
✗ Unable to find bundled Java version.
• Try updating or re-installing Android Studio.
[✓] IntelliJ IDEA Community Edition (version 2022.1)
• IntelliJ at /Users/shofiul/Library/Application Support/JetBrains/Toolbox/apps/IDEA-C/ch-0/221.5080.210/IntelliJ IDEA CE.app
• 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
[✓] IntelliJ IDEA Community Edition (version 2021.3.3)
• IntelliJ at /Users/shofiul/Library/Application Support/JetBrains/Toolbox/apps/IDEA-C/ch-0/213.7172.25/IntelliJ IDEA CE.app
• Flutter plugin version 64.0.4
• Dart plugin version 213.5744.122
[✓] VS Code (version 1.67.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.40.0
[✓] Connected device (2 available)
• macOS (desktop) • macos • darwin-arm64 • macOS 12.3.1 21E258 darwin-arm
• Chrome (web) • chrome • web-javascript • Google Chrome 101.0.4951.64
[✓] HTTP Host Availability
• All required HTTP hosts are available
! Doctor found issues in 1 category.