ImageFilter.dilate produces asymmetric results on Android

### Steps to reproduce

1. Apply ImageFilter.dilate(radiusX: 1.5, radiusY: 1.5) to a widget (e.g., an Icon or a solid-color Container).
2. Observe the dilated edges - the expansion is uneven, with the right and/or bottom edges appearing clipped or thinner

### Expected results

The dilation should expand equally on all sides.

### Actual results

Right/bottom edges show noticeably less expansion than left/top.

### Code sample

<details open><summary>Code sample</summary>
the stack of 2 icons is to make the issue more obvious visually.

```dart
import 'dart:ui' as ui;
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: Scaffold(
        backgroundColor: Colors.white,
        body: Center(
          child: Container(
            padding: const EdgeInsets.all(32),
            child: Stack(
              alignment: Alignment.center,
              children: [
                ImageFiltered(
                  imageFilter: ui.ImageFilter.dilate(
                    radiusX: 1.5,
                    radiusY: 1.5,
                  ),
                  child: const ColorFiltered(
                    colorFilter: ColorFilter.mode(
                      Colors.red,
                      BlendMode.srcATop,
                    ),
                    child: Icon(Icons.add, size: 48, color: Colors.black),
                  ),
                ),
                const Icon(Icons.add, size: 48, color: Colors.black),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

```

</details>


### Screenshots or Video

<details open>
<summary>Screenshots</summary>

<img width="1080" height="2400" alt="Image" src="https://github.com/user-attachments/assets/2338d693-a81d-4646-9187-b9ba18517629" />

<img width="388" height="359" alt="Image" src="https://github.com/user-attachments/assets/71391cba-4767-4d72-b7e9-39b9365ef68f" />

</details>


### Logs

<details open><summary>Logs</summary>

```console
❯ flutter run
Resolving dependencies...
Downloading packages...
  meta 1.18.0 (1.18.2 available)
  vector_math 2.2.0 (2.3.0 available)
Got dependencies!
2 packages have newer versions incompatible with dependency constraints.
Try `flutter pub outdated` for more information.
Launching lib/main.dart on Pixel 7a in debug mode...
Project does not support Flutter build mode: profile, skipping adding Flutter dependencies
Project does not support Flutter build mode: release, skipping adding Flutter dependencies
Running Gradle task 'assembleDebug'...                             26.2s
✓ Built build/app/outputs/flutter-apk/app-debug.apk
Installing build/app/outputs/flutter-apk/app-debug.apk...           5.0s
I/FlutterActivityAndFragmentDelegate(20755): If you are attempting to set --enable-dart-profiling via Intent extras to launch a Flutter component outside of using the Flutter CLI, note that support for setting engine flags on Android via Intent will soon be dropped; see https://github.com/flutter/flutter/issues/180686 for more information on this breaking change. To migrate, set --enable-dart-profiling or any other flags specified via Intent extras on the command line instead or see https://github.com/flutter/flutter/blob/main/docs/engine/Flutter-Android-Engine-Flags.md for alternative methods.
D/FlutterJNI(20755): Beginning load of flutter...
D/FlutterJNI(20755): flutter (null) was loaded normally!
I/flutter (20755): [IMPORTANT:flutter/shell/platform/android/android_context_vk_impeller.cc(62)] Using the Impeller rendering backend (Vulkan).
D/FlutterRenderer(20755): Width is zero. 0,0
Syncing files to device Pixel 7a...                                242ms

Flutter run key commands.
r Hot reload. 🔥🔥🔥
R Hot restart.
h List all available interactive commands.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).

A Dart VM Service on Pixel 7a is available at: http://127.0.0.1:51776/ZMb24NBUNOU=/
The Flutter DevTools debugger and profiler on Pixel 7a is available at:
http://127.0.0.1:51776/ZMb24NBUNOU=/devtools/?uri=ws://127.0.0.1:51776/ZMb24NBUNOU=/ws
I/Choreographer(20755): Skipped 542 frames!  The application may be doing too much work on its main thread.
D/WindowOnBackDispatcher(20755): setTopOnBackInvokedCallback (unwrapped): android.app.Activity$$ExternalSyntheticLambda0@e5ec82e
I/WindowExtensionsImpl(20755): Initializing Window Extensions, vendor API level=9, activity embedding enabled=true
I/morphology_test(20755): Compiler allocated 5049KB to compile void android.view.ViewRootImpl.performTraversals()
D/VRI[MainActivity](20755): WindowInsets changed: 1080x2400 statusBars:[0,118,0,0] mandatorySystemGestures:[0,150,0,84]
D/FlutterRenderer(20755): Width is zero. 0,0
D/FlutterJNI(20755): Sending viewport metrics to the engine.
I/Choreographer(20755): Skipped 147 frames!  The application may be doing too much work on its main thread.
D/FlutterJNI(20755): Sending viewport metrics to the engine.
D/WindowLayoutComponentImpl(20755): Register WindowLayoutInfoListener on Context=com.example.morphology_test.MainActivity@e853632, of which baseContext=android.app.ContextImpl@69e743
D/FlutterJNI(20755): Sending viewport metrics to the engine.
D/VRI[MainActivity](20755): WindowInsets changed: navigationBars:[0,0,0,63]
D/FlutterJNI(20755): Sending viewport metrics to the engine.
D/FlutterJNI(20755): Sending viewport metrics to the engine.
D/InsetsController(20755): hide(ime())
I/ImeTracker(20755): com.example.morphology_test:613156c1: onCancelled at PHASE_CLIENT_ALREADY_HIDDEN
D/ProfileInstaller(20755): Installing profile for com.example.morphology_test
D/VRI[MainActivity](20755): visibilityChanged oldVisibility=true newVisibility=false
W/morphology_test(20755): userfaultfd: MOVE ioctl seems unsupported: Connection timed out
D/ViewRootImpl(20755): Skipping stats log for color mode
D/InsetsController(20755): hide(ime())
I/ImeTracker(20755): com.example.morphology_test:bb1f16c: onCancelled at PHASE_CLIENT_ALREADY_HIDDEN
D/InsetsController(20755): hide(ime())
I/ImeTracker(20755): com.example.morphology_test:26310a7f: onCancelled at PHASE_CLIENT_ALREADY_HIDDEN
D/VRI[MainActivity](20755): visibilityChanged oldVisibility=true newVisibility=false

Application finished.
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
❯ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.41.5, on macOS 26.3.1 25D2128 darwin-arm64, locale en-GB)
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.1)
[✓] Xcode - develop for iOS and macOS (Xcode 26.3)
[✓] Chrome - develop for the web
⢿^[    [✓] Connected device (3 available)
    ! Error: Browsing on the local area network for iPhone 13 mini. Ensure the device is unlocked and attached with a cable or associated with the same
      local area network as this Mac.
      The device must be opted into Developer Mode to connect wirelessly. (code -27)
[✓] Network resources

• No issues found!
```

</details>


Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

ImageFilter.dilate produces asymmetric results on Android #184072

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Video

Logs

Flutter Doctor output

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

Uh oh!

ImageFilter.dilate produces asymmetric results on Android #184072

Description

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Video

Logs

Flutter Doctor output

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

Issue actions