Impeller on linux does not apply anti-aliasing to vector images

Steps to reproduce

Copy the code below to a new flutter project. Use flutter 3.47.0
Copy the circle asset in the assets folder and include it in the pubspec.yaml file
Run the code on a linux PC with and without the --no-enable-impeller flag

Expected results

flutter run -d linux --no-enable-impeller

Actual results

flutter run -d linux

Code sample

import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';

void main() {
  runApp(const MainApp());
}

class MainApp extends StatelessWidget {
  const MainApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(body: Column(
        children: [
          Center(child: Icon(Icons.circle, size: 200)),
          SvgPicture.asset('assets/circle.svg', width: 200),
        ],
      )),
    );
  }
}

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.47.0, on Arch Linux 7.1.8-arch1-3, locale en_US.UTF-8) [38ms]
    • Flutter version 3.47.0 on channel stable at /home/damiano/development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 4cf2416426 (5 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 36.0.0) [1,856ms]
    • Android SDK at /home/damiano/Android/Sdk
    • Emulator version 36.1.9.0 (build_id 13823996) (CL:N/A)
    • Platform android-36, build-tools 36.0.0
    • Java binary at: /opt/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 [9ms]
    • CHROME_EXECUTABLE = /var/lib/flatpak/app/com.google.Chrome/current/active/export/bin/com.google.Chrome

[✓] Linux toolchain - develop for Linux desktop [367ms]
    • clang version 22.1.8
    • cmake version 4.4.2
    • ninja version 1.13.2
    • pkg-config version 3.0.5
    • OpenGL core renderer: AMD Radeon Graphics (radeonsi, renoir, ACO, DRM 3.64, 7.1.8-arch1-3)
    • OpenGL core version: 4.6 (Core Profile) Mesa 26.1.7-arch1.1
    • OpenGL core shading language version: 4.60
    • OpenGL ES renderer: AMD Radeon Graphics (radeonsi, renoir, ACO, DRM 3.64, 7.1.8-arch1-3)
    • OpenGL ES version: OpenGL ES 3.2 Mesa 26.1.7-arch1.1
    • OpenGL ES shading language version: OpenGL ES GLSL ES 3.20
    • GL_EXT_framebuffer_blit: yes
    • GL_EXT_texture_format_BGRA8888: yes

[✓] Connected device (3 available) [857ms]
    • Pixel 7a (mobile) • 37281JEHN00912 • android-arm64  • Android 17 (API 37)
    • Linux (desktop)   • linux          • linux-x64      • Arch Linux 7.1.8-arch1-3
    • Chrome (web)      • chrome         • web-javascript • Google Chrome 151.0.7922.137

[✓] Network resources [372ms]
    • All expected network resources are available.

• No issues found!

@ferraridamiano

@ferraridamiano Thanks for the detailed reproduction and for demonstrating the difference between Impeller and --no-enable-impeller. I able to reproduce the issue in Linux. Routing this issue to team-engine for further investigation.

Flutter run -d linux

flutter run -d linux --no-enable-impeller

Flutter Doctor Output:

[✓] Flutter (Channel stable, 3.47.0, on Ubuntu 26.04 LTS
    6.6.119-09283-g9c138e0af8c3, locale C.UTF-8) [53ms]
    • Flutter version 3.47.0 on channel stable at /home/suryak2662/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 36.0.0)
    [3.5s]
    • Android SDK at /home/suryak2662/Android/Sdk
    • Emulator version 36.6.11.0 (build_id 15507667) (CL:N/A)
    • Platform android-36.1, build-tools 36.0.0
    • Java binary at: /opt/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 21.0.10+-14961533-b1163.108)
    • All Android licenses accepted.

[✓] Chrome - develop for the web [18ms]
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop [1,176ms]
    • Ubuntu clang version 21.1.8 (6ubuntu1)
    • cmake version 4.2.3
    • ninja version 1.13.2
    • pkg-config version 2.5.1
    • OpenGL core renderer: llvmpipe (LLVM 21.1.8, 256 bits)
    • OpenGL core version: 4.5 (Core Profile) Mesa 26.0.3-1ubuntu1
    • OpenGL core shading language version: 4.50
    • OpenGL ES renderer: llvmpipe (LLVM 21.1.8, 256 bits)
    • OpenGL ES version: OpenGL ES 3.2 Mesa 26.0.3-1ubuntu1
    • OpenGL ES shading language version: OpenGL ES GLSL ES 3.20
    • GL_EXT_framebuffer_blit: yes
    • GL_EXT_texture_format_BGRA8888: yes

[✓] Connected device (2 available) [581ms]
    • Linux (desktop) • linux  • linux-x64      • Ubuntu 26.04 LTS
      6.6.119-09283-g9c138e0af8c3
    • Chrome (web)    • chrome • web-javascript • Google Chrome 150.0.7871.128

[✓] Network resources [1,024ms]
    • All expected network resources are available.

• No issues found!

This is a known limitation of the SDF renderer right now. If you look at the SDF it's using a path to represent a circle, not a circle command. Antialiasing on DrawPath isn't implemented now and instead relies on MSAA (#185117).

Looking at the screenshots though, it seems like we aren't seeing MSAA. On windows we had to go back into the embedder and fix MSAA because it was programmed for mobile platforms, not desktop platforms. We should double check that for the linux embedder too. ( #190374 )

I believe the same problem is also affecting the CircularProgressIndicator: #191234

Fixes MSAA on the linux embedder. (flutter#191379)

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 -v and a minimal reproduction of the issue.

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Impeller on linux does not apply anti-aliasing to vector images #191171

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Impeller on linux does not apply anti-aliasing to vector images #191171

Description

Steps to reproduce

Expected results

Actual results

Code sample

Flutter Doctor output

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suryaKommana2662 commented on Aug 17, 2026

gaaclarke commented on Aug 17, 2026

caduandrade commented on Aug 18, 2026

github-actions commented on Sep 6, 2026

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