Fix RoundedSuperellipse crashes for tiny corners #177070
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This pull request addresses a crash in RoundedSuperellipse when drawn with very small corner radii. The fix introduces a minimum radius threshold, kMinRadius, below which corners are treated as sharp, correctly avoiding floating-point issues that could lead to NaNs. Additionally, the change includes a robustness improvement by clamping corner radii to the available geometry space, which prevents invalid shapes. A regression test has been added to verify the fix for tiny radii. The changes are logical and well-tested. I have one suggestion to make the new test more robust.
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| std::vector<Point> expected_head = {Point(300.0, 200.0), Point(300.0, 300.0), | ||
| Point(200.0, 200.0), Point(200.0, 300.0)}; | ||
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| for (size_t i = 0; i < expected_head.size(); i++) { | ||
| const Point& point = written_data[i]; | ||
| EXPECT_NEAR(point.x, expected_head[i].x, 0.1); | ||
| EXPECT_NEAR(point.y, expected_head[i].y, 0.1); | ||
| } |
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The current test verifies the generated vertices against an expected_head vector with a specific order. This makes the test dependent on the implementation details of vertex generation for triangle strips. A change in the vertex generation logic, even if geometrically correct, could break this test.
To make the test more robust and independent of vertex order, I suggest sorting both the actual and expected vertices before comparison. This ensures the test verifies the set of generated points, not their specific order.
Suggested change
| std::vector<Point> expected_head = {Point(300.0, 200.0), Point(300.0, 300.0), | |
| Point(200.0, 200.0), Point(200.0, 300.0)}; | |
| for (size_t i = 0; i < expected_head.size(); i++) { | |
| const Point& point = written_data[i]; | |
| EXPECT_NEAR(point.x, expected_head[i].x, 0.1); | |
| EXPECT_NEAR(point.y, expected_head[i].y, 0.1); | |
| } | |
| std::vector<Point> actual_points; | |
| actual_points.assign(written_data, written_data + result.vertex_buffer.vertex_count); | |
| const std::vector<Point> expected_points = {Point(200.0, 200.0), Point(200.0, 300.0), | |
| Point(300.0, 200.0), Point(300.0, 300.0)}; | |
| auto point_sorter = [](const Point& a, const Point& b) { | |
| if (a.x != b.x) { | |
| return a.x < b.x; | |
| } | |
| return a.y < b.y; | |
| }; | |
| std::sort(actual_points.begin(), actual_points.end(), point_sorter); | |
| ASSERT_EQ(actual_points.size(), expected_points.size()); | |
| for (size_t i = 0; i < expected_points.size(); i++) { | |
| EXPECT_NEAR(actual_points[i].x, expected_points[i].x, 0.1); | |
| EXPECT_NEAR(actual_points[i].y, expected_points[i].y, 0.1); | |
| } |
jason-simmons
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Oct 15, 2025
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autosubmit label was removed for flutter/flutter/177070, because - The status or check suite Mac tool_integration_tests_1_5 has failed. Please fix the issues identified (or deflake) before re-applying this label. |
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| */ | ||
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| if (radius <= 0) { | ||
| if (radius <= kMinRadius) { |
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There is also a kEhCloseEnough lol
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I thought about it and didn't use it in the beginning for mysterious reasons. :)
I've changed it to using kEhCloseEnough and also added a test for radii just greater than kEhCloseEnough.
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Fix #176894 I've verified that the original issue consistently reproduces on my machine and no longer crashes after this PR. ## Pre-launch Checklist - [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [ ] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [ ] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [ ] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- 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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Fix flutter#176894 I've verified that the original issue consistently reproduces on my machine and no longer crashes after this PR. ## Pre-launch Checklist - [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [ ] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [ ] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [ ] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- 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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Fix #176894
I've verified that the original issue consistently reproduces on my machine and no longer crashes after this PR.
Pre-launch Checklist
///).If you need help, consider asking for advice on the #hackers-new channel on Discord.
Note: The Flutter team is currently trialing the use of Gemini Code Assist for GitHub. Comments from the
gemini-code-assistbot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.