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Impeller (3.47) on linux does not apply anti-aliasing to CircularProgressIndicator #191234
Description
Steps to reproduce
CircularProgressIndicator without anti-aliasing on Impeller (3.47) Desktop
Expected results
Should be like '--no-enable-impeller'
Actual results
Without anti-aliasing:
Code sample
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(home: const MyHomePage());
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key});
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(body: Center(child: CircularProgressIndicator()));
}
}
Screenshots or Video
Logs
Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.47.0, on Ubuntu 24.04.4 LTS 6.8.0-137-generic, locale en_US.UTF-8) [63ms]
• Flutter version 3.47.0 on channel stable at /cadu/desenv/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 4cf2416426 (6 days ago), 2026-08-11 11:53:49 -0700
• Engine revision 5f77625673
• Dart version 3.13.0
• DevTools version 2.60.0
• Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations,
enable-native-assets, enable-record-use, enable-swift-package-manager, omit-legacy-version-file, enable-lldb-debugging, enable-uiscene-migration
[✓] Android toolchain - develop for Android devices (Android SDK version 36.1.0) [2.7s]
• Android SDK at /home/cadu/Android/Sdk
• Emulator version 36.2.12.0 (build_id 14214601) (CL:N/A)
• Platform android-36, build-tools 36.1.0
• ANDROID_SDK_ROOT = /home/cadu/Android/Sdk
• Java binary at: /cadu/desenv/android-studio/jbr/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 25.0.2+-15348964-b329.117)
• All Android licenses accepted.
[✓] Chrome - develop for the web [14ms]
• Chrome at google-chrome
[✓] Linux toolchain - develop for Linux desktop [389ms]
• Ubuntu clang version 18.1.3 (1ubuntu1)
• cmake version 3.28.3
• ninja version 1.11.1
• pkg-config version 1.8.1
• OpenGL core renderer: Mesa Intel(R) Graphics (RKL GT1) (X11)
• OpenGL core version: 4.6 (Core Profile) Mesa 25.2.8-0ubuntu0.24.04.2 (X11)
• OpenGL core shading language version: 4.60 (X11)
• OpenGL ES renderer: Mesa Intel(R) Graphics (RKL GT1) (X11)
• OpenGL ES version: OpenGL ES 3.2 Mesa 25.2.8-0ubuntu0.24.04.2 (X11)
• OpenGL ES shading language version: OpenGL ES GLSL ES 3.20 (X11)
• GL_EXT_framebuffer_blit: yes (X11)
• GL_EXT_texture_format_BGRA8888: yes (X11)
[✓] Connected device (2 available) [100ms]
• Linux (desktop) • linux • linux-x64 • Ubuntu 24.04.4 LTS 6.8.0-137-generic
• Chrome (web) • chrome • web-javascript • Google Chrome 151.0.7922.137
[✓] Network resources [344ms]
• All expected network resources are available.
• No issues found!
Activity
suryaKommana2662 commentedon Aug 18, 2026
@caduandrade Thanks for the report and for pointing out the related issue #191171. The reported behavior appears closely related to #191171, where the Engine team identified a limitation in Impeller's SDF/path anti-aliasing on Linux and is investigating the Linux embedder's MSAA configuration. This issue demonstrates the same apparent anti-aliasing problem with CircularProgressIndicator when
Impelleris enabled, while the rendering is correct with--no-enable-impeller.Routing this issue toteam-enginefor further investigation alongside #191171.gaaclarke commentedon Aug 19, 2026
@caduandrade I'm pretty sure this is a duplicate of #191171. Can you follow along on that issue and if this isn't resolved by that you can reopen this.
github-actions commentedon Sep 2, 2026
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.