New in 3.32: Couldn't resolve native function 'ImageFilter::equal' in 'dart:ui'

Steps to reproduce

This is a new error that first appeared in 3.32:
ArgumentError (Invalid argument(s): Couldn't resolve native function 'ImageFilter::equal' in 'dart:ui' : Couldn't resolve function: 'ImageFilter::equal'

It comes from using a GLSL filter via ImageFilter.shader and then changing the parameters that the shader receives. The error is then thrown on line 91 of image_filter.dart ( if (value != _imageFilter) ) or line 2008 in layer.dart ( if (value != _imageFilter) )

Downgrading to 3.29.3 solves the problem and the app runs fine.

Expected results

Above code runs without errors (as it did in 3.29.3).

Actual results

Code produces error ArgumentError (Invalid argument(s): Couldn't resolve native function 'ImageFilter::equal' in 'dart:ui' : Couldn't resolve function: 'ImageFilter::equal'

Code sample

import 'dart:ui';

import 'package:flutter/material.dart';

class Test332GlslError extends StatelessWidget
{
  final intensity = ValueNotifier(1.0);

  Future<FragmentShader> get loadShader async {
    final program = await FragmentProgram.fromAsset('shaders/mono.frag');
    return program.fragmentShader();
  }

  Widget build(context)
  {
    return Stack(
      alignment: Alignment.center,
      children: [
        FutureBuilder(
          future: loadShader,
          builder: (_, snapshot) {
            if (snapshot.connectionState != ConnectionState.done) return Container();

            return ValueListenableBuilder<double>(
                valueListenable: intensity,
                builder: (_, value, child) {
                  return ImageFiltered(
                    imageFilter: ImageFilter.shader(
                      snapshot.data!
                        ..setFloat(0, 100)
                        ..setFloat(1, 100)
                        ..setFloat(2, 0)
                        ..setFloat(3, value),
                    ),
                    child: Container(color: Colors.red),
                  );
                });
          },
        ),
        IconButton(
          onPressed: () => intensity.value = (intensity.value == 1) ? .5 : 1,
          icon: const Icon(Icons.change_circle, size: 100),
        ),
      ],
    );
  }
}

#version 460 core

#include <flutter/runtime_effect.glsl>

uniform vec2 resolution;
uniform float oncolor;
uniform float intensity;
uniform sampler2D img;

out vec4 result;

vec4 clampColor(vec4 c) {
	return clamp(c, 0., 1.);
}

void main() {
	vec2 uv = FlutterFragCoord() / resolution;
	result = texture(img, uv);

	float val = 0;

	if(oncolor == 0.)
		val = result.r;
	else if(oncolor == 1.)
		val = result.g;
	else
		val = result.b;

	float r = pow(val * intensity * 1., 1 / 1.1);
	float g = pow(val * intensity * .72, 1 / .95);
	float b = pow(val * intensity * .44, 1 / 1.04);

	result = vec4(r, g, b, result.a);

	result = clampColor(result);
}

Screenshots or Video

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Logs

The following ArgumentError was thrown during a scheduler
     callback:
     Invalid argument(s): Couldn't resolve native function
     'ImageFilter::equal' in 'dart:ui' : Couldn't resolve function:
     'ImageFilter::equal'.
     
     When the exception was thrown, this was the stack:
     #0      Native._ffi_resolver.#ffiClosure0 (dart:ffi-patch/ffi_patch.dart)
     #1      Native._ffi_resolver_function (dart:ffi-patch/ffi_patch.dart:1896:20)
ffi_patch.dart:1896
     #2      _FragmentShaderImageFilter._equals (dart:ui/painting.dart)
     #3      _FragmentShaderImageFilter.== (dart:ui/painting.dart:4492:9)
painting.dart:4492
     #4      ImageFilterLayer.imageFilter= (package:flutter/src/rendering/layer.dart:2008:15)
layer.dart:2008
     #5      _ImageFilterRenderObject.updateCompositedLayer (package:flutter/src/widgets/image_filter.dart:106:11)
image_filter.dart:106
     #6      PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:157:46)
object.dart:157
     #7      PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:121:5)
object.dart:121
     #8      PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1312:31)
object.dart:1312
     #9      PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1322:15)
object.dart:1322
     #10     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:631:23)
binding.dart:631
     #11     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:1242:13)
binding.dart:1242
     #12     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:495:5)
binding.dart:495
     #13     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1438:15)
binding.dart:1438
     #14     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1351:9)
binding.dart:1351
     #15     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1204:5)
binding.dart:1204
     #16     _invoke (dart:ui/hooks.dart:331:13)
hooks.dart:331
     #17     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:444:5)
platform_dispatcher.dart:444
     #18     _drawFrame (dart:ui/hooks.dart:303:31)

Flutter Doctor output

Doctor output

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.32.1, on macOS 15.5 24F74 darwin-arm64, locale
    en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.4)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2023.3)
[✓] VS Code (version 1.100.2)
[✓] Connected device (3 available)
    ! Error: Browsing on the local area network for cpgPhone11. 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!

@jonahwilliams

Broken by 1e2583e (cc @jonahwilliams) there is a typo - should be ImageFilter::equals.

We should probably have an eager binding mode for natives to catch issues like these (cc @dcharkes @goderbauer)

I was able to replicate this with 3.32.1 on both platforms (android and iOS) and based on above findings, labeling as regression.

stable : 3.32.1
master : 3.33.0-1.0.pre.365

Looks like this is not a dart issue, removing the 'dart dependency' label.
Please open a new issue for supporting eager bind mode if that would be helpfull

Make ImageFilter::equals a static method and fix the name in its FFI …

Squashed commit of the following:

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.

Make ImageFilter::equals a static method and fix the name in its FFI …

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New in 3.32: Couldn't resolve native function 'ImageFilter::equal' in 'dart:ui' #169936

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New in 3.32: Couldn't resolve native function 'ImageFilter::equal' in 'dart:ui' #169936

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mraleph commented on Jun 4, 2025

darshankawar commented on Jun 4, 2025

a-siva commented on Jun 4, 2025

github-actions commented on Jun 20, 2025

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