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[Impeller] Fix off-by-one indices in the SimilarPointPair/SimilarPointTrio functions used by ShadowPathGeometryTest#181623

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jason-simmons:shadow_path_test_asan
Jan 29, 2026
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[Impeller] Fix off-by-one indices in the SimilarPointPair/SimilarPointTrio functions used by ShadowPathGeometryTest#181623
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jason-simmons:shadow_path_test_asan

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…tTrio functions used by ShadowPathGeometryTest
@jason-simmons jason-simmons requested a review from flar January 28, 2026 20:20
@github-actions github-actions Bot added engine flutter/engine related. See also e: labels. e: impeller Impeller rendering backend issues and features requests labels Jan 28, 2026

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Code Review

This pull request correctly fixes an off-by-one indexing error in the SimilarPointPair and SimilarPointTrio test helper functions, which was causing out-of-bounds memory access. The logic is now sound. I've added a couple of suggestions to improve the conciseness and readability of these functions by combining multiple if statements into a single boolean expression, in line with the style guide's emphasis on readability.

Comment on lines +53 to 58
if (SimilarPoint(pair1[0], pair2[0]) && SimilarPoint(pair1[1], pair2[1])) {
return true;
}
if (SimilarPoint(pair1[1], pair2[2]) && SimilarPoint(pair1[2], pair2[1])) {
if (SimilarPoint(pair1[0], pair2[1]) && SimilarPoint(pair1[1], pair2[0])) {
return true;
}

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medium

To improve readability and conciseness, this series of if statements can be combined into a single boolean expression using ||.

  return (SimilarPoint(pair1[0], pair2[0]) && SimilarPoint(pair1[1], pair2[1])) ||
         (SimilarPoint(pair1[0], pair2[1]) && SimilarPoint(pair1[1], pair2[0]));
References
  1. Code should be optimized for readability, as it is read more often than it is written. Using a single return statement with a boolean expression can make the function's logic clearer and more direct. (link)

Comment on lines +63 to 74
if (SimilarPoint(trio1[0], trio2[0]) &&
SimilarPointPair({trio1[1], trio1[2]}, {trio2[1], trio2[2]})) {
return true;
}
if (SimilarPoint(trio1[1], trio2[2]) &&
SimilarPointPair({trio1[2], trio1[3]}, {trio2[1], trio2[3]})) {
if (SimilarPoint(trio1[0], trio2[1]) &&
SimilarPointPair({trio1[1], trio1[2]}, {trio2[0], trio2[2]})) {
return true;
}
if (SimilarPoint(trio1[1], trio2[3]) &&
SimilarPointPair({trio1[2], trio1[3]}, {trio2[1], trio2[2]})) {
if (SimilarPoint(trio1[0], trio2[2]) &&
SimilarPointPair({trio1[1], trio1[2]}, {trio2[0], trio2[1]})) {
return true;
}

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medium

This function can be made more concise by combining the if conditions into a single return statement with a boolean expression. This improves readability by presenting the logic more directly.

  return (SimilarPoint(trio1[0], trio2[0]) &&
          SimilarPointPair({trio1[1], trio1[2]}, {trio2[1], trio2[2]})) ||
         (SimilarPoint(trio1[0], trio2[1]) &&
          SimilarPointPair({trio1[1], trio1[2]}, {trio2[0], trio2[2]})) ||
         (SimilarPoint(trio1[0], trio2[2]) &&
          SimilarPointPair({trio1[1], trio1[2]}, {trio2[0], trio2[1]}));
References
  1. Code should be optimized for readability, as it is read more often than it is written. Using a single return statement with a boolean expression can make the function's logic clearer and more direct. (link)

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LGTM

@jason-simmons jason-simmons added the autosubmit Merge PR when tree becomes green via auto submit App label Jan 29, 2026
@auto-submit auto-submit Bot added this pull request to the merge queue Jan 29, 2026
Merged via the queue into flutter:master with commit b6f7105 Jan 29, 2026
182 checks passed
@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Jan 29, 2026
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Jan 30, 2026
…imilarPointTrio functions used by ShadowPathGeometryTest (flutter/flutter#181623)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Jan 30, 2026
…imilarPointTrio functions used by ShadowPathGeometryTest (flutter/flutter#181623)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Jan 30, 2026
…imilarPointTrio functions used by ShadowPathGeometryTest (flutter/flutter#181623)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Jan 30, 2026
…imilarPointTrio functions used by ShadowPathGeometryTest (flutter/flutter#181623)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Jan 30, 2026
…imilarPointTrio functions used by ShadowPathGeometryTest (flutter/flutter#181623)
auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Jan 30, 2026
Roll Flutter from da72d5936d69 to 1d9d6a9a5ef6 (33 revisions)

flutter/flutter@da72d59...1d9d6a9

2026-01-30 planetmarshall@users.noreply.github.com enable enhanced debugging for GLES playground (flutter/flutter#181157)
2026-01-30 matt.kosarek@canonical.com Make the Windows windowing_test in .ci.yaml have bringup as false (flutter/flutter#181664)
2026-01-30 engine-flutter-autoroll@skia.org Roll Packages from cd4fd61 to 510dd40 (4 revisions) (flutter/flutter#181726)
2026-01-30 engine-flutter-autoroll@skia.org Roll Skia from edbf7e9eb846 to 4745eb2fe837 (1 revision) (flutter/flutter#181725)
2026-01-30 kazbek.sultanov.doc@gmail.com Enhance error handling of WidgetsBindingObserver callbacks (flutter/flutter#181174)
2026-01-30 engine-flutter-autoroll@skia.org Roll Skia from 05d3cb9d2be9 to edbf7e9eb846 (2 revisions) (flutter/flutter#181715)
2026-01-30 engine-flutter-autoroll@skia.org Roll Skia from c198e5fa9cd9 to 05d3cb9d2be9 (1 revision) (flutter/flutter#181712)
2026-01-30 engine-flutter-autoroll@skia.org Roll Dart SDK from 920b7e24583e to 2703fd9733ce (2 revisions) (flutter/flutter#181693)
2026-01-30 engine-flutter-autoroll@skia.org Roll Skia from b9f40c193e7a to c198e5fa9cd9 (6 revisions) (flutter/flutter#181692)
2026-01-30 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#181690)
2026-01-30 jason-simmons@users.noreply.github.com Extend the Windows tool_integration_tests_2_9 shard timeout to 1 hour (flutter/flutter#181678)
2026-01-29 34871572+gmackall@users.noreply.github.com Add `android_sdk` dependency to `android_engine_opengles_tests` (flutter/flutter#181681)
2026-01-29 engine-flutter-autoroll@skia.org Roll Dart SDK from a0685c8e946b to 920b7e24583e (3 revisions) (flutter/flutter#181680)
2026-01-29 engine-flutter-autoroll@skia.org Roll Skia from 128b5213711e to b9f40c193e7a (14 revisions) (flutter/flutter#181675)
2026-01-29 jason-simmons@users.noreply.github.com [Impeller] Ensure that HostBuffers/DeviceBuffers allocated by RendererTest tests are valid for the lifetime of the RenderPass (flutter/flutter#181635)
2026-01-29 jason-simmons@users.noreply.github.com [Impeller] Fix off-by-one indices in the SimilarPointPair/SimilarPointTrio functions used by ShadowPathGeometryTest (flutter/flutter#181623)
2026-01-29 anishtiwari5077@gmail.com 180162 fix radio list tile and switch list tile accept widget states controller (flutter/flutter#180367)
2026-01-29 116356835+AbdeMohlbi@users.noreply.github.com Remove unused test file (flutter/flutter#181671)
2026-01-29 jason-simmons@users.noreply.github.com Roll libpng to version 1.6.54 (flutter/flutter#181625)
2026-01-29 34871572+gmackall@users.noreply.github.com Remove nonstandard ndkpath for `hybrid_android_views` integration test (flutter/flutter#181666)
2026-01-29 34465683+rkishan516@users.noreply.github.com Add TestWidgetsApp utility and refactor widget tests to use WidgetsApp (flutter/flutter#180456)
2026-01-29 rmolivares@renzo-olivares.dev Add `TestTextField` and migrate tests (flutter/flutter#180494)
2026-01-29 jacksongardner@google.com Merge changelog for 3.38.9 (flutter/flutter#181668)
2026-01-29 dacoharkes@google.com [flutter_tools] Deprecate `plugin_ffi` template (flutter/flutter#181588)
2026-01-29 brackenavaron@gmail.com Deprecate onReorder callback (flutter/flutter#178242)
2026-01-29 zhongliu88889@gmail.com [web] Use defensive null check in text editing placeElement (flutter/flutter#180795)
2026-01-29 engine-flutter-autoroll@skia.org Roll Packages from 1cb2148 to cd4fd61 (4 revisions) (flutter/flutter#181663)
2026-01-29 engine-flutter-autoroll@skia.org Roll Skia from 89df65f8324c to 128b5213711e (2 revisions) (flutter/flutter#181651)
2026-01-29 dacoharkes@google.com [hooks] Don't run build hooks for code assets in `flutter run` (flutter/flutter#181542)
2026-01-29 engine-flutter-autoroll@skia.org Roll Dart SDK from f10dcbfca98f to a0685c8e946b (5 revisions) (flutter/flutter#181653)
2026-01-29 evanwall@buffalo.edu Fixes getUniformX for Vulkan (flutter/flutter#181286)
2026-01-29 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from adhoq9ouVRh0xzkm3... to isy1ARvK-3bsvtfc-... (flutter/flutter#181641)
2026-01-29 dmytro@turskyi.com Add isDark, isLight, and isSystem getters to ThemeMode (flutter/flutter#181475)

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:
...
LongCatIsLooong pushed a commit to LongCatIsLooong/flutter that referenced this pull request Feb 6, 2026
flutter-zl pushed a commit to flutter-zl/flutter that referenced this pull request Feb 10, 2026
rickhohler pushed a commit to rickhohler/flutter that referenced this pull request Feb 19, 2026
creatorpiyush pushed a commit to creatorpiyush/packages that referenced this pull request Jun 10, 2026
…r#10931)

Roll Flutter from da72d5936d69 to 1d9d6a9a5ef6 (33 revisions)

flutter/flutter@da72d59...1d9d6a9

2026-01-30 planetmarshall@users.noreply.github.com enable enhanced debugging for GLES playground (flutter/flutter#181157)
2026-01-30 matt.kosarek@canonical.com Make the Windows windowing_test in .ci.yaml have bringup as false (flutter/flutter#181664)
2026-01-30 engine-flutter-autoroll@skia.org Roll Packages from cd4fd61 to 510dd40 (4 revisions) (flutter/flutter#181726)
2026-01-30 engine-flutter-autoroll@skia.org Roll Skia from edbf7e9eb846 to 4745eb2fe837 (1 revision) (flutter/flutter#181725)
2026-01-30 kazbek.sultanov.doc@gmail.com Enhance error handling of WidgetsBindingObserver callbacks (flutter/flutter#181174)
2026-01-30 engine-flutter-autoroll@skia.org Roll Skia from 05d3cb9d2be9 to edbf7e9eb846 (2 revisions) (flutter/flutter#181715)
2026-01-30 engine-flutter-autoroll@skia.org Roll Skia from c198e5fa9cd9 to 05d3cb9d2be9 (1 revision) (flutter/flutter#181712)
2026-01-30 engine-flutter-autoroll@skia.org Roll Dart SDK from 920b7e24583e to 2703fd9733ce (2 revisions) (flutter/flutter#181693)
2026-01-30 engine-flutter-autoroll@skia.org Roll Skia from b9f40c193e7a to c198e5fa9cd9 (6 revisions) (flutter/flutter#181692)
2026-01-30 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#181690)
2026-01-30 jason-simmons@users.noreply.github.com Extend the Windows tool_integration_tests_2_9 shard timeout to 1 hour (flutter/flutter#181678)
2026-01-29 34871572+gmackall@users.noreply.github.com Add `android_sdk` dependency to `android_engine_opengles_tests` (flutter/flutter#181681)
2026-01-29 engine-flutter-autoroll@skia.org Roll Dart SDK from a0685c8e946b to 920b7e24583e (3 revisions) (flutter/flutter#181680)
2026-01-29 engine-flutter-autoroll@skia.org Roll Skia from 128b5213711e to b9f40c193e7a (14 revisions) (flutter/flutter#181675)
2026-01-29 jason-simmons@users.noreply.github.com [Impeller] Ensure that HostBuffers/DeviceBuffers allocated by RendererTest tests are valid for the lifetime of the RenderPass (flutter/flutter#181635)
2026-01-29 jason-simmons@users.noreply.github.com [Impeller] Fix off-by-one indices in the SimilarPointPair/SimilarPointTrio functions used by ShadowPathGeometryTest (flutter/flutter#181623)
2026-01-29 anishtiwari5077@gmail.com 180162 fix radio list tile and switch list tile accept widget states controller (flutter/flutter#180367)
2026-01-29 116356835+AbdeMohlbi@users.noreply.github.com Remove unused test file (flutter/flutter#181671)
2026-01-29 jason-simmons@users.noreply.github.com Roll libpng to version 1.6.54 (flutter/flutter#181625)
2026-01-29 34871572+gmackall@users.noreply.github.com Remove nonstandard ndkpath for `hybrid_android_views` integration test (flutter/flutter#181666)
2026-01-29 34465683+rkishan516@users.noreply.github.com Add TestWidgetsApp utility and refactor widget tests to use WidgetsApp (flutter/flutter#180456)
2026-01-29 rmolivares@renzo-olivares.dev Add `TestTextField` and migrate tests (flutter/flutter#180494)
2026-01-29 jacksongardner@google.com Merge changelog for 3.38.9 (flutter/flutter#181668)
2026-01-29 dacoharkes@google.com [flutter_tools] Deprecate `plugin_ffi` template (flutter/flutter#181588)
2026-01-29 brackenavaron@gmail.com Deprecate onReorder callback (flutter/flutter#178242)
2026-01-29 zhongliu88889@gmail.com [web] Use defensive null check in text editing placeElement (flutter/flutter#180795)
2026-01-29 engine-flutter-autoroll@skia.org Roll Packages from 1cb2148 to cd4fd61 (4 revisions) (flutter/flutter#181663)
2026-01-29 engine-flutter-autoroll@skia.org Roll Skia from 89df65f8324c to 128b5213711e (2 revisions) (flutter/flutter#181651)
2026-01-29 dacoharkes@google.com [hooks] Don't run build hooks for code assets in `flutter run` (flutter/flutter#181542)
2026-01-29 engine-flutter-autoroll@skia.org Roll Dart SDK from f10dcbfca98f to a0685c8e946b (5 revisions) (flutter/flutter#181653)
2026-01-29 evanwall@buffalo.edu Fixes getUniformX for Vulkan (flutter/flutter#181286)
2026-01-29 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from adhoq9ouVRh0xzkm3... to isy1ARvK-3bsvtfc-... (flutter/flutter#181641)
2026-01-29 dmytro@turskyi.com Add isDark, isLight, and isSystem getters to ThemeMode (flutter/flutter#181475)

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:
...
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