Sample repro for flutter #93615

flutter-#93615.dart

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

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter #93615',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Flutter #93615'),
        ),
        body: Container(
          color: Colors.black,
          child: Center(
            child: FutureBuilder<ui.Image>(
                future: createTestImage(),
                builder: (context, snapshot) =>
                    snapshot.hasData ? RawImage(image: snapshot.data) : const Text('No data loaded.')),
          ),
        ),
      ),
    );
  }
}

Future<ui.Image> createTestImage() async {
  const width = 256;
  const height = 256;
  final data = Uint8List(width * height * 4);
  // 2.6.0-12.0.pre.670 (858a328712): RGBA => Red fill
  // latest master                  : BGRA => Blue fill
  for (int i = 0; i < data.length; i += 4) {
    data[i] = 0xff;
    data[i + 1] = 0;
    data[i + 2] = 0;
    data[i + 3] = 0xff; // A
  }

  // white pixel
  // 2.6.0-12.0.pre.670 (858a328712): bottom-left
  // latest master                  : top-left
  data[0] = data[1] = data[2] = 0xff;

  final descriptor = ui.ImageDescriptor.raw(
    await ui.ImmutableBuffer.fromUint8List(data),
    width: width,
    height: height,
    pixelFormat: ui.PixelFormat.bgra8888,
  );
  final codec = await descriptor.instantiateCodec();
  final frame = await codec.getNextFrame();
  return frame.image;
}

flutter/flutter#93615