Support round caps for the fast arc stroke generator #178269

b-luk · 2025-11-10T23:59:41Z

Support round caps for the fast arc stroke generator.

Factors out Tessellator::GenerateRoundCapLine's cap generation logic into a new Tessellator::GenerateRoundCap method to be shared by Tessellator::GenerateRoundCapLine and Tessellator::GenerateStrokedArc.

Fixes #169400

Pre-launch Checklist

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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.

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flar

This all looks correct, these are mostly just suggestions and I think you had some ideas about refactoring yourself, so I'm going to leave this as a "comment" review for now.

engine/src/flutter/impeller/tessellator/tessellator.cc

- Split up GenerateRoundCap into two functions for start/end - Add factory constructors for ArcVertexGenerator - Use GetTrigsForDeviceRadius instead of ComputeQuadrantDivisions + GetTrigsForDivisions

flar

Looks good except to delete the obsolete part of that one comment.

engine/src/flutter/impeller/display_list/canvas.cc

flar · 2025-11-13T07:43:02Z

engine/src/flutter/impeller/tessellator/tessellator.h

+  // directly opposite the semicircle's straight diameter. Vertices progress
+  // in the stroke's direction of travel, ending with two vertices at
+  // (p + perpendicular) and (p - perpendicular) that form the semicircle's
+  // diameter.


flar · 2025-11-13T07:44:00Z

engine/src/flutter/impeller/tessellator/tessellator.h

+  // The generated vertices begin with two vertices at (p + perpendicular) and
+  // (p - perpendicular) which form the semicircle's diameter. Vertices progress
+  // in the stroke's direction of travel, ending with the vertex at the midpoint
+  // of the semicircle's curve.


flar · 2025-11-13T07:45:41Z

The ninja problems are fixed at the top of tree. Update your branch with a pull (not a rebase) to fix those errors.

flar

I need to wait to see the impact on goldens before approving.

flar

It looks like the only way to remove an approval is to "Request Changes"... :(

b-luk · 2025-11-13T16:30:14Z

I need to wait to see the impact on goldens before approving.

Acknowledged. Regardless of if the goldens are impacted, I think before I actually submit this, I'd want to ensure that there are tests which specifically test circular round cap arcs (if these tests don't already exist), and I'd want to ensure there is some benchmarking so I verify any performance impact before/after this change. I'm still looking into what I need to do for these tests/benchmarking, but I'll update here when I figure out what I want to do.

flar · 2025-11-13T16:36:03Z

I need to wait to see the impact on goldens before approving.

Acknowledged. Regardless of if the goldens are impacted, I think before I actually submit this, I'd want to ensure that there are tests which specifically test circular round cap arcs (if these tests don't already exist), and I'd want to ensure there is some benchmarking so I verify any performance impact before/after this change. I'm still looking into what I need to do for these tests/benchmarking, but I'll update here when I figure out what I want to do.

There are a number of tests for Arcs in this file (for example):

flutter/engine/src/flutter/impeller/display_list/aiks_dl_basic_unittests.cc

Line 967 in 862e4a7

TEST_P(AiksTest, StrokedArcsRenderCorrectlyWithRoundEnds) {

I don't remember where we have benchmarks for arc drawing off hand.

flutter-dashboard · 2025-11-14T01:33:19Z

Golden file changes have been found for this pull request. Click here to view and triage (e.g. because this is an intentional change).

If you are still iterating on this change and are not ready to resolve the images on the Flutter Gold dashboard, consider marking this PR as a draft pull request above. You will still be able to view image results on the dashboard, commenting will be silenced, and the check will not try to resolve itself until marked ready for review.

For more guidance, visit Writing a golden file test for package:flutter.

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

Changes reported for pull request #178269 at sha ec2a843

b-luk · 2025-11-17T23:50:22Z

I made a benchmark at #178690 and ran it locally on a couple physical devices with and without this change. Here are some selected results:

iPhone 12

		before	after	change
frame build time	avg	0.939	1.170	+24.62%
	90th pct	1.362	1.711	+25.62%
	99th pct	1.689	1.886	+11.66%
	worst	1.741	2.054	+17.98%
rasterizer build time	avg	5.552	5.110	-7.96%
	90th pct	9.972	8.535	-14.41%
	99th pct	15.552	13.387	-13.92%
	worst	34.907	18.165	-47.96%
gpu frame time	avg	10.430	9.523	-8.70%
	90th pct	14.648	13.672	-6.67%
	99th pct	15.625	15.625	0.00%
	worst	43.945	15.625	-64.44%

Pixel 8

		before	after	change
frame build time	avg	6.785	6.473	-4.60%
	90th pct	9.587	8.784	-8.38%
	99th pct	11.132	10.958	-1.56%
	worst	11.939	11.541	-3.33%
rasterizer build time	avg	9.132	8.545	-6.42%
	90th pct	11.453	10.547	-7.91%
	99th pct	12.779	11.552	-9.60%
	worst	37.934	11.748	-69.03%

Full timeline summary results for the runs:

iPhone12 before:

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  "worst_frame_build_time_millis": 1.741,
  "missed_frame_build_budget_count": 0,
  "average_frame_rasterizer_time_millis": 5.551593939393935,
  "stddev_frame_rasterizer_time_millis": 1.9515427364554598,
  "90th_percentile_frame_rasterizer_time_millis": 9.972,
  "99th_percentile_frame_rasterizer_time_millis": 15.552,
  "worst_frame_rasterizer_time_millis": 34.907,
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  "average_vsync_transitions_missed": 1.0,
  "90th_percentile_vsync_transitions_missed": 1.0,
  "99th_percentile_vsync_transitions_missed": 1.0,
  "average_vsync_frame_lag": 0.0,
  "90th_percentile_vsync_frame_lag": 0.0,
  "99th_percentile_vsync_frame_lag": 0.0,
  "average_layer_cache_count": 0.0,
  "90th_percentile_layer_cache_count": 0.0,
  "99th_percentile_layer_cache_count": 0.0,
  "average_frame_request_pending_latency": 16363.08695652174,
  "90th_percentile_frame_request_pending_latency": 17393.0,
  "99th_percentile_frame_request_pending_latency": 18931.0,
  "worst_layer_cache_count": 0.0,
  "average_layer_cache_memory": 0.0,
  "90th_percentile_layer_cache_memory": 0.0,
  "99th_percentile_layer_cache_memory": 0.0,
  "worst_layer_cache_memory": 0.0,
  "average_picture_cache_count": 0.0,
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  "worst_picture_cache_memory": 0.0,
  "total_ui_gc_time": 149.70600000000005,
  "30hz_frame_percentage": 0.0,
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  "average_gpu_memory_mb": 102.89843799999984,
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}

flar · 2025-11-18T21:02:14Z

I'm guessing we'd see more improvements if the benchmark only measured the round cap case. Did you try hard-coding round caps in your benchmark code and testing before/after to see the isolated improvement?

b-luk · 2025-11-18T21:55:44Z

Here are results after hard-coding the benchmark test to use round caps for every arc.

iPhone 12

		before	after	change
frame build time	avg	1.124	1.183	5.26%
	90th pct	1.710	1.732	1.29%
	99th pct	1.879	1.899	1.06%
	worst	3.145	2.001	-36.38%
rasterizer build time	avg	5.517	4.745	-13.99%
	90th pct	11.640	6.303	-45.85%
	99th pct	16.889	15.317	-9.31%
	worst	20.045	18.401	-8.20%
gpu frame time	avg	10.800	10.509	-2.69%
	90th pct	15.625	15.625	0.00%
	99th pct	15.625	15.625	0.00%
	worst	23.438	15.625	-33.33%

Pixel 8

		before	after	change
frame build time	avg	6.403	6.094	-4.82%
	90th pct	9.103	8.307	-8.74%
	99th pct	10.995	10.187	-7.35%
	worst	11.335	11.436	0.89%
rasterizer build time	avg	9.712	8.766	-9.74%
	90th pct	11.665	10.662	-8.60%
	99th pct	13.140	12.009	-8.61%
	worst	88.234	13.416	-84.79%

flutter-dashboard · 2025-11-21T21:23:41Z

Golden file changes are available for triage from new commit, Click here to view.

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Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

Changes reported for pull request #178269 at sha 74cdb0c

flar · 2025-11-21T21:33:40Z

Let's give it a little time to get a dozen or 2 entries in the database before we push this.

flutter-dashboard · 2025-11-24T18:28:36Z

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.

flutter-dashboard · 2025-11-24T18:28:37Z

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.

flar

LGTM

auto-submit · 2025-12-01T19:35:04Z

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Support round caps for the fast arc stroke generator. Factors out `Tessellator::GenerateRoundCapLine`'s cap generation logic into a new `Tessellator::GenerateRoundCap` method to be shared by `Tessellator::GenerateRoundCapLine` and `Tessellator::GenerateStrokedArc`. Fixes flutter#169400 ## 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]. **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.  [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

Support round caps for the fast arc stroke generator. Factors out `Tessellator::GenerateRoundCapLine`'s cap generation logic into a new `Tessellator::GenerateRoundCap` method to be shared by `Tessellator::GenerateRoundCapLine` and `Tessellator::GenerateStrokedArc`. Fixes flutter#169400 ## 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]. **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.  [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

Support round caps for the fast arc stroke generator

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github-actions bot added engine flutter/engine related. See also e: labels. e: impeller Impeller rendering backend issues and features requests labels Nov 10, 2025

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- Split up GenerateRoundCap into two functions for start/end - Add factory constructors for ArcVertexGenerator - Use GetTrigsForDeviceRadius instead of ComputeQuadrantDivisions + GetTrigsForDivisions

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b-luk added 2 commits November 13, 2025 08:15

Merge branch 'master' into arcstrokeroundcaps

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Add macrobenchmark perf test for drawing arcs #178690

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Support round caps for the fast arc stroke generator #178269

Support round caps for the fast arc stroke generator #178269

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