Image fails to decode when cacheWidth or ResizeImage derives a side of 0 for a very thin image #194668

import 'dart:async';
import 'dart:typed_data';
import 'dart:ui' as ui;

import 'package:flutter/painting.dart';
import 'package:flutter_test/flutter_test.dart';

Future<Uint8List> createPng(int width, int height) async {
  final recorder = ui.PictureRecorder();
  ui.Canvas(recorder).drawRect(
    ui.Rect.fromLTWH(0, 0, width.toDouble(), height.toDouble()),
    ui.Paint()..color = const ui.Color(0xFF0000FF),
  );
  final ui.Image image = await recorder.endRecording().toImage(width, height);
  final ByteData? data = await image.toByteData(format: ui.ImageByteFormat.png);
  return data!.buffer.asUint8List();
}

Future<Size> resolveSize(ImageProvider provider) async {
  final completer = Completer<Size>();
  provider.resolve(ImageConfiguration.empty).addListener(
    ImageStreamListener(
      (ImageInfo info, bool _) => completer.complete(
        Size(info.image.width.toDouble(), info.image.height.toDouble()),
      ),
      onError: (Object error, StackTrace? _) => completer.completeError(error),
    ),
  );
  return completer.future;
}

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  test('exact, one side', () async {
    final image = MemoryImage(await createPng(4000, 1));
    // Fails: Exception: Codec failed to produce an image
    expect(await resolveSize(ResizeImage(image, width: 100)), const Size(100, 1));
  });

  test('fit', () async {
    final image = MemoryImage(await createPng(4000, 1));
    // Fails: assertion in TargetImageSize
    expect(
      await resolveSize(ResizeImage(image, width: 100, policy: ResizeImagePolicy.fit)),
      const Size(100, 1),
    );
  });
}