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Fixes https://github.com/flutter/flutter/issues/168798 Closes https://github.com/flutter/flutter/issues/134250 ### Description - Adds `Paint` dithering for gradient shaders in `canvaskit` - Adds `Paint` dithering for gradient shaders in `skwasm` ### CanvasKit | Before | After | | - | - | | <img width="739" alt="canvaskit_bug" src="https://github.com/user-attachments/assets/cf15e6ff-e0ab-4bce-9db1-653271f5adc8" /> | <img width="739" alt="canvaskit_fix" src="https://github.com/user-attachments/assets/3aba09a5-f27a-4c17-a596-44b53961373e" /> | ### SkWASM | Before | After | | - | - | | <img width="739" alt="skwasm_bug" src="https://github.com/user-attachments/assets/fe882450-f656-4a1b-9811-fdded5e4a737" /> | <img width="739" alt="skwasm_fix" src="https://github.com/user-attachments/assets/86bf2cf9-d743-453b-9d7a-600e293bf8f1" /> | <details> <summary>Sample Source Code</summary> ```dart import 'package:flutter/material.dart'; void main() { runApp(const App()); } class App extends StatelessWidget { const App({super.key}); @override Widget build(BuildContext context) { return Container( width: 400, height: 400, decoration: BoxDecoration( gradient: LinearGradient( colors: const [Color(0xff324958), Color(0xff26323a)], begin: Alignment.bottomLeft, end: Alignment.topRight, ), ), ); } } ``` </details> ## Pre-launch Checklist - [X] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [X] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [X] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [X] I signed the [CLA]. - [X] I listed at least one issue that this PR fixes in the description above. - [X] I updated/added relevant documentation (doc comments with `///`). - [X] I added new tests to check the change I am making, or this PR is [test-exempt]. - [X] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [X] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
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