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[CP] [canvaskit] Fall back to multi-context rendering on Firefox and Safari #52141
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flutter#49572) This PR refactors rasterization to support two different modes, single GL context mode backed by a single OffscreenCanvas (Chrome), and multi-context mode which uses many GL contexts and canvases. ## 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] and the [C++, Objective-C, Java style guides]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I added new tests to check the change I am making or feature I am adding, or the PR is [test-exempt]. See [testing the engine] for instructions on writing and running engine tests. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I signed the [CLA]. - [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/wiki/Tree-hygiene#overview [Tree Hygiene]: https://github.com/flutter/flutter/wiki/Tree-hygiene [test-exempt]: https://github.com/flutter/flutter/wiki/Tree-hygiene#tests [Flutter Style Guide]: https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style [testing the engine]: https://github.com/flutter/flutter/wiki/Testing-the-engine [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/wiki/Tree-hygiene#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/wiki/Chat
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@harryterkelsen @yjbanov this CP seems to be the same as #51730 which was closed because of concerns landing the complex change as a hotfix to stable. Can you please sync up with @zanderso before continuing with CP? |
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I think we should accept this hot fix. It fixes a critical performance issue (some apps are nearly unusable in Firefox and, to a lesser extent, in Safari). It is less risky now compared to the time the cherry pick was requested. This change has been tested with many of our customers since it landed in January. |
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@yjbanov this seems to be working fine on beta, but just in case, could you monitor the change as it lands in stable to ensure the regressions are no longer there? |
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Cherry pick of #49572 to fix flutter/flutter#145563
Cherry-pick request issue: flutter/flutter#146787
Pre-launch Checklist
///).If you need help, consider asking for advice on the #hackers-new channel on Discord.