Canvas.drawCircle behaves wrong on Linux with Impeller

Steps to reproduce

Create a CustomPainter
Call canvas.drawCircle in paint using the PaintingStyle.stroke style in the Paint
flutter run, the bug occurs
flutter run --no-enable-impeller, the bug does not occur

Expected results

A hoop is drawn:

Actual results

The entire outside of the circle is filled:

Code sample

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return CustomPaint(painter: MyPainter());
  }
}

class MyPainter extends CustomPainter {
  late final Paint _trackPaint;

  MyPainter() {
    _trackPaint = Paint()
      ..color = Colors.white
      ..style = PaintingStyle.stroke
      ..strokeWidth = 4;
  }

  @override
  void paint(Canvas canvas, Size size) {
    Offset center = Offset(size.width / 2, size.height / 2);
    double r = (size.width > size.height ? size.height : size.width) / 2;

    canvas.drawCircle(center, r, _trackPaint);
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return false;
  }
}

Screenshots or Video

Screenshots / Video demonstration

See above

Logs

N/A

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.47.7, on Ubuntu 26.04.1 LTS 7.0.0-38-generic, locale en_US.UTF-8) [31ms]
    • Flutter version 3.47.7 on channel stable at /home/jeff/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision abaf9c5237 (2 weeks ago), 2026-10-08 09:51:21 -0700
    • Engine revision deb287481e
    • Dart version 3.13.5
    • 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 37.0.0) [259ms]
    • Android SDK at /home/jeff/Android/Sdk
    • Emulator version 37.2.12.0 (build_id 16428233) (CL:N/A)
    • Platform android-37.0, build-tools 37.0.0
    • 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 25.0.3+-15898627-b508.16)
    • All Android licenses accepted.

[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome) [4ms]
    ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.

[✓] Linux toolchain - develop for Linux desktop [289ms]
    • 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: NVIDIA GeForce RTX 5080/PCIe/SSE2
    • OpenGL core version: 4.6.0 NVIDIA 595.91.07
    • OpenGL core shading language version: 4.60 NVIDIA
    • OpenGL ES renderer: NVIDIA GeForce RTX 5080/PCIe/SSE2
    • OpenGL ES version: OpenGL ES 3.2 NVIDIA 595.91.07
    • OpenGL ES shading language version: OpenGL ES GLSL ES 3.20
    • GL_EXT_framebuffer_blit: yes
    • GL_EXT_texture_format_BGRA8888: yes

[✓] Connected device (1 available) [29ms]
    • Linux (desktop) • linux • linux-x64 • Ubuntu 26.04.1 LTS 7.0.0-38-generic

[✓] Network resources [304ms]
    • All expected network resources are available.

! Doctor found issues in 1 category.

@jefflongo

@jefflongo Thanks for the report. I was able to reproduce the issue on Linux with Impeller enabled. The issue does not occur when Impeller is disabled using --no-enable-impeller.

This may be related to (#182708) and (#183339). Further investigation is needed. routing to the team-engine for further investigation.

Flutter Doctor Output

[✓] Flutter (Channel master, 3.50.0-1.0.pre-232, on Ubuntu 26.04
    LTS 6.6.147-09648-g97ef00d8a343, locale C.UTF-8) [1,892ms]
    • Flutter version 3.50.0-1.0.pre-232 on channel master at
      /home/suryak2662/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 66b3ad9017 (25 hours ago), 2026-10-25
      03:58:21 +0000
    • Engine revision 66b3ad9017
    • Dart version 3.15.0 (build 3.15.0-72.0.dev)
    • DevTools version 2.61.0
    • 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-windowing, enable-lldb-debugging,
      enable-uiscene-migration, enable-riscv64, enable-hcpp

[!] Android toolchain - develop for Android devices (Android SDK
    version 36.0.0) [3.3s]
    • Android SDK at /home/suryak2662/Android/Sdk
    • Emulator version 36.6.11.0 (build_id 15507667) (CL:N/A)
    • Platform android-36, build-tools 36.0.0
    ! Multiple adb binaries found. This can cause conflicts and
      device detection issues:
        - /home/suryak2662/Android/Sdk/platform-tools/adb
        - /usr/lib/android-sdk/platform-tools/adb
    • Java binary at: /opt/android-studio/jbr/bin/java
      This JDK is specified in your Flutter configuration.
      To change the current JDK, run: `flutter config
      --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build
      21.0.10+-14961533-b1163.108)
    ! Some Android licenses not accepted. To resolve this, run:
      flutter doctor --android-licenses

[✓] Chrome - develop for the web [20ms]
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop [1,266ms]
    • 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) [744ms]
    • Linux (desktop) • linux  • linux-x64      • Ubuntu 26.04
      LTS 6.6.147-09648-g97ef00d8a343
    • Chrome (web)    • chrome • web-javascript • Google Chrome
      150.0.7871.128

[✓] Network resources [552ms]
    • All expected network resources are available.

! Doctor found issues in 1 category.

@walley892

@walley892 can you please take a look at this?

This also affects ovals

Also affects arcs. My workaround was to draw an arc from 0 to 2pi - 1e-6

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Canvas.drawCircle behaves wrong on Linux with Impeller #195208

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Video

Logs

Flutter Doctor output

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Canvas.drawCircle behaves wrong on Linux with Impeller #195208

Description

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Video

Logs

Flutter Doctor output

Activity

suryaKommana2662 commented on Oct 26, 2026

gaaclarke commented on Oct 26, 2026

walley892 commented on Oct 30, 2026

jefflongo commented on Oct 30, 2026

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