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[iOS] Rendering images with borders causes jagged/aliased edges #170056
Description
Steps to reproduce
1.Use an image example.png or url https://i.ibb.co/KxGsDbcQ/3.png
2.Render it in Flutter using Image
3. Observe the edges on iOS physical devices
Expected results
The png image borders should render smoothly with proper anti-aliasing
skia on flutter 3.22:
Actual results
impeller on flutter stable:
Code sample
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// TRY THIS: Try running your application with "flutter run". You'll see
// the application has a purple toolbar. Then, without quitting the app,
// try changing the seedColor in the colorScheme below to Colors.green
// and then invoke "hot reload" (save your changes or press the "hot
// reload" button in a Flutter-supported IDE, or press "r" if you used
// the command line to start the app).
//
// Notice that the counter didn't reset back to zero; the application
// state is not lost during the reload. To reset the state, use hot
// restart instead.
//
// This works for code too, not just values: Most code changes can be
// tested with just a hot reload.
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// TRY THIS: Try changing the color here to a specific color (to
// Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
// change color while the other colors stay the same.
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
//
// TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
// action in the IDE, or press "p" in the console), to see the
// wireframe for each widget.
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text('You have pushed the button this many times:'),
Image.network("https://i.ibb.co/KxGsDbcQ/3.png",height: 500,fit: BoxFit.cover,isAntiAlias: true),
//or Image.asset("assets/images/example.png",isAntiAlias: true,filterQuality: FilterQuality.high),
Text(
'$_counter',
style: Theme.of(context).textTheme.headlineMedium,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
Screenshots or Video
Logs
No response
Flutter Doctor output
Doctor output
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.32.2, on macOS 15.3.2 24D81 darwin-arm64, locale
zh-Hans-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 35.0.1)
✗ cmdline-tools component is missing.
Try installing or updating Android Studio.
Alternatively, download the tools from
https://developer.android.com/studio#command-line-tools-only and make sure
to set the ANDROID_HOME environment variable.
See https://developer.android.com/studio/command-line for more details.
✗ Android license status unknown.
Run `flutter doctor --android-licenses` to accept the SDK licenses.
See https://flutter.dev/to/macos-android-setup for more details.
[✓] Xcode - develop for iOS and macOS (Xcode 16.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.3)
[✓] VS Code (version 1.100.3)
[✓] Connected device (4 available)
[✓] Network resources
Activity
[-]Rendering images with semi-transparent borders causes jagged/aliased edges on iOS physical devices[/-][+]Rendering images with semi-transparent borders causes jagged/aliased edges on iOS physical devices impeller[/+][-]Rendering images with semi-transparent borders causes jagged/aliased edges on iOS physical devices impeller[/-][+]Rendering images with borders causes jagged/aliased edges on iOS physical devices impeller[/+][-]Rendering images with borders causes jagged/aliased edges on iOS physical devices impeller[/-][+][iOS] Rendering images with borders causes jagged/aliased edges[/+]danagbemava-nc commentedon Jun 6, 2025
Reproduces on my
iPhone 16 Pro Maxbut not myiPhone XS.Seems like this is a duplicate of #170089
Labeling for further insight
flutter doctor -v
jonahwilliams commentedon Jun 9, 2025
Potential ideas:
[Impeller] disable lossy texture compression. (#170596)
github-actions commentedon Jun 30, 2025
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.[Impeller] disable lossy texture compression. (flutter#170596)
[Impeller] disable lossy texture compression. (#170596)