Fix mutating Paint bug #171180
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Fix mutating Paint bug #171180
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chunhtai
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Jun 25, 2025
| @@ -46,6 +46,10 @@ import 'test_async_utils.dart'; | |||
| /// paints, among other things, two circles of radius 10.0 and 20.0 (in that | |||
| /// order). | |||
| /// | |||
| /// This matcher does not work well when [Paint] instances are mutated and | |||
| /// reused. Create a new instance of [Paint] for subsequent draw calls instead | |||
| /// of mutating and reusing one instance. | |||
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reusing the paint is fine, but it is just our TestRecordingCanvas can't handle it. I think we should fix the TestRecordingCanvas instead.
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Good point, that should be doable. I'll take a look.
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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging. If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix? Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group. |
This only fixes it for drawCircle. I'll have to implement all the other canvas calls.
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This will require adding similar changes for all of the other methods in Canvas. Moving to draft for now. |
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This is ready for re-review. Now it solves the problem for every Canvas method that uses Paint. |
ValentinVignal
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Jul 15, 2025
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flutter/flutter@9c626d9...440713c 2025-07-18 stuartmorgan@google.com Add OS version support section to plugin docs (flutter/flutter#172316) 2025-07-18 engine-flutter-autoroll@skia.org Roll Dart SDK from 7fcc5f48c335 to fe2232bd5b9f (2 revisions) (flutter/flutter#172339) 2025-07-18 robert.ancell@canonical.com Refactor handling of frame waiting. (flutter/flutter#172277) 2025-07-18 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#172332) 2025-07-17 matanlurey@users.noreply.github.com Refactor and forbid `base/exit.dart` outside of `lib/runner.dart` (flutter/flutter#171923) 2025-07-17 matanlurey@users.noreply.github.com Use UTC timezone for `stamp_command_test` to avoid local TZ flakes (flutter/flutter#172319) 2025-07-17 1961493+harryterkelsen@users.noreply.github.com [web] Add tests for unified platform view embedding behavior (flutter/flutter#172313) 2025-07-17 jmccandless@google.com Platform views shouldn't receive pointer events when not laid out (flutter/flutter#172043) 2025-07-17 ahmedsameha1@gmail.com Fix Size.isEmpty description (flutter/flutter#172021) 2025-07-17 iamtoricool@gmail.com feat: Add `maxCount` parameter to `Badge.count` constructor. (flutter/flutter#171054) 2025-07-17 31859944+LongCatIsLooong@users.noreply.github.com add `debugPaintTextLayoutBoxes` for debugging text layout (flutter/flutter#168876) 2025-07-17 engine-flutter-autoroll@skia.org Roll Packages from 4a231ae to cb8fef6 (31 revisions) (flutter/flutter#172303) 2025-07-17 jmccandless@google.com Fix mutating Paint bug (flutter/flutter#171180) 2025-07-17 jmccandless@google.com No SystemContextMenu when readOnly is true (flutter/flutter#171242) 2025-07-17 muhammad.mohiuddin@live.com Add a getter to get the recorder used by painting context (flutter/flutter#170223) 2025-07-17 jason-simmons@users.noreply.github.com [Impeller] Add missing SetPipeline call for the vertices uber pipeline in AtlasContents (flutter/flutter#172273) 2025-07-17 engine-flutter-autoroll@skia.org Roll Dart SDK from 486f9c0663bc to 7fcc5f48c335 (1 revision) (flutter/flutter#172279) 2025-07-17 engine-flutter-autoroll@skia.org Roll Skia from 3673a1f26a63 to 9587301e33bc (3 revisions) (flutter/flutter#172281) 2025-07-17 jason-simmons@users.noreply.github.com Fix a race in FlutterEngineTest.CanLogToStdout (flutter/flutter#172025) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC bmparr@google.com,stuartmorgan@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
azatech
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Jul 28, 2025
A tricky bug was encountered in https://github.com/flutter/flutter/pull/170321/files#r2138619243 where mutating Paint caused [paints](https://main-api.flutter.dev/flutter/flutter_test/paints.html) to behave strangely. Originally this PR just added something to the docs for `paints` to give people a heads up, but now it fixes the root cause. Yak shave 🪒 . Fixes flutter#171194
vashworth
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Jul 30, 2025
…r#9646) flutter/flutter@9c626d9...440713c 2025-07-18 stuartmorgan@google.com Add OS version support section to plugin docs (flutter/flutter#172316) 2025-07-18 engine-flutter-autoroll@skia.org Roll Dart SDK from 7fcc5f48c335 to fe2232bd5b9f (2 revisions) (flutter/flutter#172339) 2025-07-18 robert.ancell@canonical.com Refactor handling of frame waiting. (flutter/flutter#172277) 2025-07-18 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#172332) 2025-07-17 matanlurey@users.noreply.github.com Refactor and forbid `base/exit.dart` outside of `lib/runner.dart` (flutter/flutter#171923) 2025-07-17 matanlurey@users.noreply.github.com Use UTC timezone for `stamp_command_test` to avoid local TZ flakes (flutter/flutter#172319) 2025-07-17 1961493+harryterkelsen@users.noreply.github.com [web] Add tests for unified platform view embedding behavior (flutter/flutter#172313) 2025-07-17 jmccandless@google.com Platform views shouldn't receive pointer events when not laid out (flutter/flutter#172043) 2025-07-17 ahmedsameha1@gmail.com Fix Size.isEmpty description (flutter/flutter#172021) 2025-07-17 iamtoricool@gmail.com feat: Add `maxCount` parameter to `Badge.count` constructor. (flutter/flutter#171054) 2025-07-17 31859944+LongCatIsLooong@users.noreply.github.com add `debugPaintTextLayoutBoxes` for debugging text layout (flutter/flutter#168876) 2025-07-17 engine-flutter-autoroll@skia.org Roll Packages from 4a231ae to cb8fef6 (31 revisions) (flutter/flutter#172303) 2025-07-17 jmccandless@google.com Fix mutating Paint bug (flutter/flutter#171180) 2025-07-17 jmccandless@google.com No SystemContextMenu when readOnly is true (flutter/flutter#171242) 2025-07-17 muhammad.mohiuddin@live.com Add a getter to get the recorder used by painting context (flutter/flutter#170223) 2025-07-17 jason-simmons@users.noreply.github.com [Impeller] Add missing SetPipeline call for the vertices uber pipeline in AtlasContents (flutter/flutter#172273) 2025-07-17 engine-flutter-autoroll@skia.org Roll Dart SDK from 486f9c0663bc to 7fcc5f48c335 (1 revision) (flutter/flutter#172279) 2025-07-17 engine-flutter-autoroll@skia.org Roll Skia from 3673a1f26a63 to 9587301e33bc (3 revisions) (flutter/flutter#172281) 2025-07-17 jason-simmons@users.noreply.github.com Fix a race in FlutterEngineTest.CanLogToStdout (flutter/flutter#172025) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC bmparr@google.com,stuartmorgan@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
ksokolovskyi
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Aug 19, 2025
A tricky bug was encountered in https://github.com/flutter/flutter/pull/170321/files#r2138619243 where mutating Paint caused [paints](https://main-api.flutter.dev/flutter/flutter_test/paints.html) to behave strangely. Originally this PR just added something to the docs for `paints` to give people a heads up, but now it fixes the root cause. Yak shave 🪒 . Fixes flutter#171194
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A tricky bug was encountered in https://github.com/flutter/flutter/pull/170321/files#r2138619243 where mutating Paint caused paints to behave strangely.
Originally this PR just added something to the docs for
paintsto give people a heads up, but now it fixes the root cause. Yak shave 🪒 .Fixes #171194