dev/integration_tests/wide_gamut_test/lib/main.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:convert' show base64Decode;
import 'dart:ui' as ui;
import 'package:flutter/material.dart';

/// A 100x100 png in Display P3 colorspace.
const String _displayP3Logo =
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void main() => run(Setup.blur);

enum Setup {
  none,
  image,
  canvasSaveLayer,
  blur,
}

void run(Setup setup) {
  runApp(MyApp(setup));
}

class MyApp extends StatelessWidget {
  const MyApp(this._setup, {super.key});

  final Setup _setup;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Wide Gamut Test',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(_setup, title: 'Wide Gamut Test'),
    );
  }
}

class _SaveLayerDrawer extends CustomPainter {
  _SaveLayerDrawer(this._image);

  final ui.Image? _image;

  @override
  void paint(Canvas canvas, Size size) {
    if (_image != null) {
      final Rect imageRect = Rect.fromCenter(
          center: Offset.zero,
          width: _image!.width.toDouble(),
          height: _image!.height.toDouble());
      canvas.saveLayer(imageRect, Paint());
      canvas.drawRect(
          imageRect.inflate(-_image!.width.toDouble() / 4.0),
          Paint()
            ..style = PaintingStyle.stroke
            ..color = const Color(0xffffffff)
            ..strokeWidth = 3);
      canvas.saveLayer(imageRect, Paint()..blendMode = BlendMode.dstOver);
      canvas.drawImage(_image!,
          Offset(-_image!.width / 2.0, -_image!.height / 2.0), Paint());
      canvas.restore();
      canvas.restore();
    }
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) => true;
}

Future<ui.Image> _loadImage() async {
  final ui.ImmutableBuffer buffer =
      await ui.ImmutableBuffer.fromUint8List(base64Decode(_displayP3Logo));
  final ui.ImageDescriptor descriptor =
      await ui.ImageDescriptor.encoded(buffer);
  final ui.Codec codec = await descriptor.instantiateCodec();
  return (await codec.getNextFrame()).image;
}

class MyHomePage extends StatefulWidget {
  const MyHomePage(this.setup, {super.key, required this.title});

  final Setup setup;
  final String title;

  @override
  State<StatefulWidget> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  ui.Image? _image;

  @override
  void initState() {
    if (widget.setup == Setup.canvasSaveLayer) {
      _loadImage().then((ui.Image? value) {
        setState(() {
          _image = value;
        });
      });
    }
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    late Widget imageWidget;
    switch (widget.setup) {
      case Setup.none:
        imageWidget = Container();
        break;
      case Setup.image:
        imageWidget = Image.memory(base64Decode(_displayP3Logo));
        break;
      case Setup.canvasSaveLayer:
        imageWidget = CustomPaint(painter: _SaveLayerDrawer(_image));
        break;
      case Setup.blur:
        imageWidget = Stack(
          children: <Widget>[
            const ColoredBox(
              color: Color(0xff00ff00),
              child: SizedBox(
                width: 100,
                height: 100,
              ),
            ),
            ImageFiltered(
                imageFilter: ui.ImageFilter.blur(sigmaX: 6, sigmaY: 6),
                child: Image.memory(base64Decode(_displayP3Logo))),
          ],
        );
        break;
    }

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            imageWidget,
          ],
        ),
      ),
    );
  }
}