[Impeller] Inconsistent border rendering with thin width #162378
Description
Steps to reproduce
Run the sample code
Device: Pixel 6a API 34 (Emulator)
Expected results
Border rendered correctly
Actual results
Some lines seem thinner, whereas others appear thicker.
Code sample
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const MainApp());
}
class MainApp extends StatelessWidget {
const MainApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: HomeScreen(),
);
}
}
class HomeScreen extends StatelessWidget {
const HomeScreen({
super.key,
});
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.black,
body: SafeArea(
child: SingleChildScrollView(
child: Column(
children: [
for (int i = 0; i < 100; i++)
_Frame(
child: ListTile(
title: Text(''),
),
),
],
),
),
),
);
}
}
class _Frame extends StatelessWidget {
const _Frame({
required this.child,
});
final Widget child;
@override
Widget build(BuildContext context) {
return Container(
decoration: BoxDecoration(
border: Border(
bottom: BorderSide(
color: Colors.white,
width: 0.15,
),
),
),
child: child,
);
}
}
Screenshots or Video
Screenshots / Video demonstration
| With Impeller | No Impeller |
|---|---|
 |
 |
Comparison of the two versions.
Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
[✓] Flutter (Channel master, 3.29.0-1.0.pre.144, on macOS 15.1 24B2083 darwin-arm64, locale en-VN) [4.5s]
• Flutter version 3.29.0-1.0.pre.144 on channel master at /Users/khoa/fvm/versions/master
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 46f96a44e4 (8 hours ago), 2025-01-29 11:02:53 +0530
• Engine revision 46f96a44e4
• Dart version 3.8.0 (build 3.8.0-24.0.dev)
• DevTools version 2.42.0
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [1,491ms]
• Android SDK at /Users/khoa/Library/Android/sdk
• Platform android-35, build-tools 35.0.0
• Java binary at: /Users/khoa/Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
This is the JDK bundled with the latest Android Studio installation on this machine.
To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
• Java version OpenJDK Runtime Environment (build 21.0.4+-12422083-b607.1)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 16.2) [818ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16C5032a
• CocoaPods version 1.16.2
[✗] Chrome - develop for the web (Cannot find Chrome executable at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome) [8ms]
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✓] Android Studio (version 2024.2) [8ms]
• Android Studio at /Users/khoa/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 21.0.4+-12422083-b607.1)
[✓] VS Code (version 1.96.4) [6ms]
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.102.0
[✓] Connected device (3 available) [5.7s]
• sdk gphone64 arm64 (mobile) • emulator-5554 • android-arm64 • Android 14 (API 34) (emulator)
• iPhone 16 Pro Max (mobile) • 33B397ED-CCA5-4780-BD6C-E3EF3C8CCE0A • ios • com.apple.CoreSimulator.SimRuntime.iOS-18-2 (simulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 15.1 24B2083 darwin-arm64
[✓] Network resources [1,430ms]
• All expected network resources are available.