[Impeller] Color issue with BlendMode.screen when using Gradient.linear shader in Paint #145442
Description
Steps to reproduce
I can still replay the issue B at #141160 .
Flutter version 3.19.3 and master channel 3.21.0-11.0.pre.42 .
Code list below.
Expected results
Green circle.
Actual results
black circle.
Code sample
Code sample
import 'package:flutter/material.dart';
import 'dart:ui' as ui;
void main() {
runApp(const MyWidget());
}
class MyWidget extends StatelessWidget {
const MyWidget({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: Scaffold(
body: Align(
alignment: Alignment.center,
child: CustomPaint(
size: Size.infinite,
painter: BubbleLayerPainter(),
),
),
),
);
}
}
class BubbleLayerPainter extends CustomPainter {
const BubbleLayerPainter();
@override
void paint(Canvas canvas, Size size) {
final colorBlur = Paint()
..style = PaintingStyle.fill
..maskFilter = const MaskFilter.blur(BlurStyle.normal, 10)
..color = Colors.black;
final center = size.center(Offset.zero);
canvas.drawCircle(center, 128, colorBlur);
final surface = Paint()
..blendMode = BlendMode.screen
..shader = ui.Gradient.linear(
Offset.zero, Offset(0, size.height), [Colors.green, Colors.green]);
canvas.drawPaint(surface);
}
@override
bool shouldRepaint(BubbleLayerPainter oldDelegate) {
return true;
}
}Screenshots or Video
Screenshots / Video demonstration
| Impeller On | Impeller Off |
|---|---|
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Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.19.3, on macOS 13.6 22G120 darwin-arm64, locale zh-Hans-CN)
• Flutter version 3.19.3 on channel stable at /Users/abc/fvm/versions/stable
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision ba39319843 (12 days ago), 2024-03-07 15:22:21 -0600
• Engine revision 2e4ba9c6fb
• Dart version 3.3.1
• DevTools version 2.31.1
• Pub download mirror https://pub.flutter-io.cn
• Flutter download mirror https://storage.flutter-io.cn
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
• Android SDK at /Users/zhx/Library/Android/sdk
• Platform android-34, build-tools 34.0.0
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 17.0.9+0-17.0.9b1087.7-11185874)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 15.2)
• Xcode at /Applications/Xcode_15.2.app/Contents/Developer
• Build 15C500b
• CocoaPods version 1.15.2
[✓] Android Studio (version 2023.2)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 17.0.9+0-17.0.9b1087.7-11185874)
[✓] VS Code (version 1.87.2)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.85.20240301
[✓] Connected device (1 available)
• iPhone (mobile) • ___ • ios • iOS 16.5.1 20F75
[✓] Network resources
• All expected network resources are available.
• No issues found!