// 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 = 'iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAABdWlDQ1BrQ0dDb2xv' 'clNwYWNlRGlzcGxheVAzAAAokXWQvUvDUBTFT6tS0DqIDh0cMolD1NIKdnFoKxRF' 'MFQFq1OafgltfCQpUnETVyn4H1jBWXCwiFRwcXAQRAcR3Zw6KbhoeN6XVNoi3sfl' '/Ticc7lcwBtQGSv2AijplpFMxKS11Lrke4OHnlOqZrKooiwK/v276/PR9d5PiFlN' 'u3YQ2U9cl84ul3aeAlN//V3Vn8maGv3f1EGNGRbgkYmVbYsJ3iUeMWgp4qrgvMvH' 'gtMunzuelWSc+JZY0gpqhrhJLKc79HwHl4plrbWD2N6f1VeXxRzqUcxhEyYYilBR' 'gQQF4X/8044/ji1yV2BQLo8CLMpESRETssTz0KFhEjJxCEHqkLhz634PrfvJbW3v' 'FZhtcM4v2tpCAzidoZPV29p4BBgaAG7qTDVUR+qh9uZywPsJMJgChu8os2HmwiF3' 'e38M6Hvh/GMM8B0CdpXzryPO7RqFn4Er/QcXKWq8UwZBywAAANplWElmTU0AKgAA' 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'gtJLIDa+E4drCAMWI7Y6wjVQDii9BILBzWC5ocSAfV4ZvQVSCgr1pvSUXgMpBcW8' 'k/pjS++BYBAzUO7hK4Wn7AQQg2Jxnyf6nQECDIRem8NT+CtG7P9TV0ypfvt9m8Ya' 'FGJ7bN2mnK571g2RXXkvm76TQEIjAIXezMuuWL05BE6Z/Gwh1lCz80BkKycYMaXE' 'gr3yrjmlwqXLjmWw1O2I5Wmp9Xxjyh+AVIZ6ADIAqcwClakzeMgApDILVKbO4CED' 'kMosUJk6g4dUBuRfvf1am9VRqzYAAAAASUVORK5CYII='; 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 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 _drawImage() async { final ui.PictureRecorder recorder = ui.PictureRecorder(); const Size markerSize = Size(120, 120); final double canvasSize = markerSize.height + 3; final Canvas canvas = Canvas(recorder, Rect.fromLTWH(0, 0, canvasSize, canvasSize)); final Paint ovalPaint = Paint()..color = const Color(0xff00ff00); final Path 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 = Completer(); ui.decodeImageFromPixels( Uint8List.view(byteData!.buffer), canvasSize.toInt(), canvasSize.toInt(), ui.PixelFormat.rgbaFloat32, (ui.Image image) { completer.complete(image); }, ); return completer.future; } Future _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 createState() => _MyHomePageState(); } class _MyHomePageState extends State { 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: [ 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.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.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.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.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: [imageWidget]), ), ); } }