flutter_flutter/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:async' show Completer;
import 'dart:convert' show base64Decode;
import 'dart:typed_data' show ByteData, Uint8List;
import 'dart:ui' as ui;
import 'package:flutter/material.dart';

/// A 100x100 png in Display P3 colorspace.
const String _displayP3Logo =
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    '/Ticc7lcwBtQGSv2AijplpFMxKS11Lrke4OHnlOqZrKooiwK/v276/PR9d5PiFlN'
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void main() => run(Setup.sweepGradient);

enum Setup {
  none,
  image,
  canvasSaveLayer,
  blur,
  drawnImage,
  container,
  linearGradient,
  radialGradient,
  conicalGradient,
  sweepGradient,
}

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 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> _drawImage() async {
  final recorder = ui.PictureRecorder();
  const markerSize = Size(120, 120);
  final double canvasSize = markerSize.height + 3;
  final canvas = Canvas(recorder, Rect.fromLTWH(0, 0, canvasSize, canvasSize));

  final ovalPaint = Paint()..color = const Color(0xff00ff00);
  final ovalPath = Path()
    ..addOval(
      Rect.fromLTWH((canvasSize - markerSize.width) / 2, 1, markerSize.width, markerSize.height),
    );
  canvas.drawPath(ovalPath, ovalPaint);

  final ui.Picture picture = recorder.endRecording();
  final ui.Image image = await picture.toImage(canvasSize.toInt(), (canvasSize + 0).toInt());
  final ByteData? byteData = await image.toByteData(format: ui.ImageByteFormat.rawExtendedRgba128);
  final completer = Completer<ui.Image>();
  ui.decodeImageFromPixels(
    Uint8List.view(byteData!.buffer),
    canvasSize.toInt(),
    canvasSize.toInt(),
    ui.PixelFormat.rgbaFloat32,
    (ui.Image image) {
      completer.complete(image);
    },
  );
  return completer.future;
}

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();
  final ui.FrameInfo frameInfo = await codec.getNextFrame();
  codec.dispose();
  return frameInfo.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() {
    switch (widget.setup) {
      case Setup.canvasSaveLayer:
        _loadImage().then(
          (ui.Image? value) => setState(() {
            _image = value;
          }),
        );
      case Setup.drawnImage:
        _drawImage().then(
          (ui.Image? value) => setState(() {
            _image = value;
          }),
        );
      case Setup.image ||
          Setup.blur ||
          Setup.none ||
          Setup.container ||
          Setup.linearGradient ||
          Setup.radialGradient ||
          Setup.conicalGradient ||
          Setup.sweepGradient:
        break;
    }
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    late Widget imageWidget;
    switch (widget.setup) {
      case Setup.none:
        imageWidget = Container();
      case Setup.image:
        imageWidget = Image.memory(base64Decode(_displayP3Logo));
      case Setup.drawnImage:
        imageWidget = CustomPaint(painter: _SaveLayerDrawer(_image));
      case Setup.canvasSaveLayer:
        imageWidget = CustomPaint(painter: _SaveLayerDrawer(_image));
      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)),
            ),
          ],
        );
      case Setup.container:
        imageWidget = Container(
          width: 100,
          height: 100,
          color: const Color.from(
            alpha: 1,
            red: 1,
            green: 0,
            blue: 0,
            colorSpace: ui.ColorSpace.displayP3,
          ),
        );
      case Setup.linearGradient:
        imageWidget = Container(
          width: 100,
          height: 100,
          decoration: const BoxDecoration(
            gradient: LinearGradient(
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
              colors: <Color>[
                Color.from(
                  alpha: 1,
                  red: 1,
                  green: 0,
                  blue: 0,
                  colorSpace: ui.ColorSpace.displayP3,
                ),
                Color.from(
                  alpha: 1,
                  red: 0,
                  green: 1,
                  blue: 0,
                  colorSpace: ui.ColorSpace.displayP3,
                ),
              ],
            ),
          ),
        );
      case Setup.radialGradient:
        imageWidget = Container(
          width: 100,
          height: 100,
          decoration: const BoxDecoration(
            gradient: RadialGradient(
              colors: <Color>[
                Color.from(
                  alpha: 1,
                  red: 1,
                  green: 0,
                  blue: 0,
                  colorSpace: ui.ColorSpace.displayP3,
                ),
                Color.from(
                  alpha: 1,
                  red: 0,
                  green: 1,
                  blue: 0,
                  colorSpace: ui.ColorSpace.displayP3,
                ),
              ],
            ),
          ),
        );
      case Setup.conicalGradient:
        imageWidget = Container(
          width: 100,
          height: 100,
          decoration: const BoxDecoration(
            gradient: RadialGradient(
              focal: Alignment(0.2, 0.2),
              colors: <Color>[
                Color.from(
                  alpha: 1,
                  red: 1,
                  green: 0,
                  blue: 0,
                  colorSpace: ui.ColorSpace.displayP3,
                ),
                Color.from(
                  alpha: 1,
                  red: 0,
                  green: 1,
                  blue: 0,
                  colorSpace: ui.ColorSpace.displayP3,
                ),
              ],
            ),
          ),
        );
      case Setup.sweepGradient:
        imageWidget = Container(
          width: 100,
          height: 100,
          decoration: const BoxDecoration(
            gradient: SweepGradient(
              colors: <Color>[
                Color.from(
                  alpha: 1,
                  red: 1,
                  green: 0,
                  blue: 0,
                  colorSpace: ui.ColorSpace.displayP3,
                ),
                Color.from(
                  alpha: 1,
                  red: 0,
                  green: 1,
                  blue: 0,
                  colorSpace: ui.ColorSpace.displayP3,
                ),
              ],
            ),
          ),
        );
    }

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