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Implements ClipRSuperellipse on backdrop filter on platform view#182643

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Implements ClipRSuperellipse on backdrop filter on platform view#182643
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@Hari-07 Hari-07 commented Feb 19, 2026

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  • Implements ClipRSuperellipse on backdrop filter on platform view

List which issues are fixed by this PR. You must list at least one issue. An issue is not required if the PR fixes something trivial like a typo.
Fixes #179125

If you had to change anything in the flutter/tests repo, include a link to the migration guide as per the breaking change policy.

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@Hari-07 Hari-07 requested a review from a team as a code owner February 19, 2026 21:56
@github-actions github-actions Bot added platform-ios iOS applications specifically engine flutter/engine related. See also e: labels. team-ios Owned by iOS platform team labels Feb 19, 2026

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Code Review

The pull request correctly implements support for ClipRSuperellipse on backdrop filters for platform views on iOS by utilizing the cornerCurve property of CALayer. This is a valuable addition for achieving high-fidelity UI effects. However, there are two important issues to address: the cornerCurve property is only available on iOS 13.0 and later, so an availability check is required to prevent crashes on older supported iOS versions (like iOS 12). Additionally, because UIVisualEffectView instances are reused within ChildClippingView, the cornerCurve property must be explicitly reset to kCACornerCurveCircular when the clip is not a superellipse to avoid leaking the continuous curve state from previous frames. The review follows the Flutter Style Guide, focusing on correctness and platform compatibility.

@hellohuanlin hellohuanlin self-requested a review February 19, 2026 22:46
- (instancetype)initWithFrame:(CGRect)frame
blurRadius:(CGFloat)blurRadius
cornerRadius:(CGFloat)cornerRadius
isRSE:(BOOL)isRSE

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nit: isRoundedSuperellipse

visualEffectView.layer.cornerRadius = cornerRadius;
if (@available(iOS 13.0, *)) {
visualEffectView.layer.cornerCurve =
isRSE ? kCACornerCurveContinuous : kCACornerCurveCircular;

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why are we setting the cornerCurve both here and inside PlatformViewFilter?

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When initialising it simply sets state and doesn't apply it

- (instancetype)initWithFrame:(CGRect)frame
                   blurRadius:(CGFloat)blurRadius
                 cornerRadius:(CGFloat)cornerRadius
                        isRSE:(BOOL)isRSE
             visualEffectView:(UIVisualEffectView*)visualEffectView {
  if (self = [super init]) {
    _frame = frame;
    _blurRadius = blurRadius;
    _cornerRadius = cornerRadius;
    _isRSE = isRSE;
    [PlatformViewFilter prepareOnce:visualEffectView];
    if (![PlatformViewFilter isUIVisualEffectViewImplementationValid]) {
      FML_DLOG(ERROR) << "Apple's API for UIVisualEffectView changed. Update the implementation to "
                         "access the gaussianBlur CAFilter.";
      return nil;
    }
    _backdropFilterView = visualEffectView;
    _backdropFilterViewConfigured = NO;
  }
  return self;
}

And its set again inside updateVisualEffectView which gets called on rerender I think. Last time when I was in this area not having it in update seemed to break hot reload.

Maybe we could do this inside the init but that was just the pre existing pattern I stuck to

@Hari-07 Hari-07 force-pushed the backdrop-clip-rse branch 2 times, most recently from 32fdea0 to ae59762 Compare February 26, 2026 07:27
@Hari-07 Hari-07 added the autosubmit Merge PR when tree becomes green via auto submit App label Mar 8, 2026
@auto-submit auto-submit Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Mar 8, 2026
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autosubmit label was removed for flutter/flutter/182643, because The base commit of the PR is older than 7 days and can not be merged. Please merge the latest changes from the main into this branch and resubmit the PR.

@Hari-07 Hari-07 force-pushed the backdrop-clip-rse branch from ae59762 to 6f111df Compare March 8, 2026 02:01
@jmagman jmagman added the autosubmit Merge PR when tree becomes green via auto submit App label Mar 9, 2026
@auto-submit auto-submit Bot added this pull request to the merge queue Mar 9, 2026
Merged via the queue into flutter:master with commit 0da188e Mar 9, 2026
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@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Mar 9, 2026
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Roll Flutter from 2ec61af30672 to 195ae7b3a122 (36 revisions)

flutter/flutter@2ec61af...195ae7b

2026-03-10 mdebbar@google.com [web] Updates to the README (flutter/flutter#176292)
2026-03-10 jason-simmons@users.noreply.github.com [Impeller] Do not log VK_ERROR_SURFACE_LOST_KHR errors returned by vkAcquireNextImageKHR (flutter/flutter#183338)
2026-03-10 jason-simmons@users.noreply.github.com DlDeferredImageGPUImpeller::ImageWrapper texture thread safety improvements (flutter/flutter#183429)
2026-03-10 34465683+rkishan516@users.noreply.github.com refactor: remove material imports from system_context_menu_test, table_test (flutter/flutter#183368)
2026-03-10 34465683+rkishan516@users.noreply.github.com refactor: remove material from baseline_test, slivers_test (flutter/flutter#183367)
2026-03-10 30870216+gaaclarke@users.noreply.github.com Migrated circle sdf to euclidean 2d derivative (flutter/flutter#183184)
2026-03-10 engine-flutter-autoroll@skia.org Roll Packages from c717018 to ee460d6 (2 revisions) (flutter/flutter#183451)
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2026-03-10 engine-flutter-autoroll@skia.org Roll Skia from 887df915a95e to e7b957806202 (1 revision) (flutter/flutter#183434)
2026-03-10 brackenavaron@gmail.com Remove material from scrollable_test.dart (flutter/flutter#181429)
2026-03-09 737941+loic-sharma@users.noreply.github.com Update 'a: text input' globs (flutter/flutter#183405)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from 3aa442e0624a to 887df915a95e (7 revisions) (flutter/flutter#183423)
2026-03-09 47866232+chunhtai@users.noreply.github.com Adds geometry dirty nodes (flutter/flutter#180375)
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2026-03-09 Veselblu@yandex.ru Add Alexander Dmitriev to AUTHORS (flutter/flutter#183357)
2026-03-09 katelovett@google.com Update org triage (flutter/flutter#183254)
2026-03-09 8847263+littleGnAl@users.noreply.github.com [Android] Avoid plugin auto-registration during FlutterFragmentActivity recreate timing window (flutter/flutter#182963)
2026-03-09 chingjun@google.com Standardize skia includes. (flutter/flutter#183404)
2026-03-09 116356835+AbdeMohlbi@users.noreply.github.com Add a note to `arcTo` docs about the 2PI drawing angle issue (flutter/flutter#183293)
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2026-03-09 bkonyi@google.com [ Tool ] Fix --print-dtd not working for web targets (flutter/flutter#183171)
2026-03-09 victorsanniay@gmail.com Add await or ignore lint to flutter_driver unawaited callsites (flutter/flutter#183334)
2026-03-09 30870216+gaaclarke@users.noreply.github.com Cleanup MockVulkan when the vulkan instance is destroyed (flutter/flutter#183324)
2026-03-09 52160996+FMorschel@users.noreply.github.com Updates tests commit (flutter/flutter#183301)
2026-03-09 22373191+Hari-07@users.noreply.github.com Implements `ClipRSuperellipse` on backdrop filter on platform view (flutter/flutter#182643)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from ea4fd0e1472a to 3aa442e0624a (1 revision) (flutter/flutter#183397)
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…lutter#182643)

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- Implements `ClipRSuperellipse` on backdrop filter on platform view 

*List which issues are fixed by this PR. You must list at least one
issue. An issue is not required if the PR fixes something trivial like a
typo.*
Fixes flutter#179125 


*If you had to change anything in the [flutter/tests] repo, include a
link to the migration guide as per the [breaking change policy].*

## Pre-launch Checklist

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- [x] I read the [Tree Hygiene] wiki page, which explains my
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we expect every widget to implement].
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- [x] I listed at least one issue that this PR fixes in the description
above.
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okorohelijah pushed a commit to okorohelijah/packages that referenced this pull request Mar 26, 2026
…r#11222)

Roll Flutter from 2ec61af30672 to 195ae7b3a122 (36 revisions)

flutter/flutter@2ec61af...195ae7b

2026-03-10 mdebbar@google.com [web] Updates to the README (flutter/flutter#176292)
2026-03-10 jason-simmons@users.noreply.github.com [Impeller] Do not log VK_ERROR_SURFACE_LOST_KHR errors returned by vkAcquireNextImageKHR (flutter/flutter#183338)
2026-03-10 jason-simmons@users.noreply.github.com DlDeferredImageGPUImpeller::ImageWrapper texture thread safety improvements (flutter/flutter#183429)
2026-03-10 34465683+rkishan516@users.noreply.github.com refactor: remove material imports from system_context_menu_test, table_test (flutter/flutter#183368)
2026-03-10 34465683+rkishan516@users.noreply.github.com refactor: remove material from baseline_test, slivers_test (flutter/flutter#183367)
2026-03-10 30870216+gaaclarke@users.noreply.github.com Migrated circle sdf to euclidean 2d derivative (flutter/flutter#183184)
2026-03-10 engine-flutter-autoroll@skia.org Roll Packages from c717018 to ee460d6 (2 revisions) (flutter/flutter#183451)
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2026-03-10 brackenavaron@gmail.com Remove material from scrollable_test.dart (flutter/flutter#181429)
2026-03-09 737941+loic-sharma@users.noreply.github.com Update 'a: text input' globs (flutter/flutter#183405)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from 3aa442e0624a to 887df915a95e (7 revisions) (flutter/flutter#183423)
2026-03-09 47866232+chunhtai@users.noreply.github.com Adds geometry dirty nodes (flutter/flutter#180375)
2026-03-09 engine-flutter-autoroll@skia.org Roll Dart SDK from 5b1aa4f8db14 to ebef6c849489 (1 revision) (flutter/flutter#183417)
2026-03-09 Veselblu@yandex.ru Add Alexander Dmitriev to AUTHORS (flutter/flutter#183357)
2026-03-09 katelovett@google.com Update org triage (flutter/flutter#183254)
2026-03-09 8847263+littleGnAl@users.noreply.github.com [Android] Avoid plugin auto-registration during FlutterFragmentActivity recreate timing window (flutter/flutter#182963)
2026-03-09 chingjun@google.com Standardize skia includes. (flutter/flutter#183404)
2026-03-09 116356835+AbdeMohlbi@users.noreply.github.com Add a note to `arcTo` docs about the 2PI drawing angle issue (flutter/flutter#183293)
2026-03-09 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#183411)
2026-03-09 bkonyi@google.com [ Tool ] Fix --print-dtd not working for web targets (flutter/flutter#183171)
2026-03-09 victorsanniay@gmail.com Add await or ignore lint to flutter_driver unawaited callsites (flutter/flutter#183334)
2026-03-09 30870216+gaaclarke@users.noreply.github.com Cleanup MockVulkan when the vulkan instance is destroyed (flutter/flutter#183324)
2026-03-09 52160996+FMorschel@users.noreply.github.com Updates tests commit (flutter/flutter#183301)
2026-03-09 22373191+Hari-07@users.noreply.github.com Implements `ClipRSuperellipse` on backdrop filter on platform view (flutter/flutter#182643)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from ea4fd0e1472a to 3aa442e0624a (1 revision) (flutter/flutter#183397)
2026-03-09 engine-flutter-autoroll@skia.org Roll Dart SDK from 050b2f646425 to 5b1aa4f8db14 (1 revision) (flutter/flutter#183393)
2026-03-09 engine-flutter-autoroll@skia.org Roll Packages from fe3de64 to c717018 (10 revisions) (flutter/flutter#183396)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from a83dca75c531 to ea4fd0e1472a (1 revision) (flutter/flutter#183389)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from 254e44141861 to a83dca75c531 (7 revisions) (flutter/flutter#183388)
2026-03-09 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from giLoee6arX5CRHuRh... to ox-II3wPpa818y78_... (flutter/flutter#183386)
2026-03-09 engine-flutter-autoroll@skia.org Roll Dart SDK from 1604910613c7 to 050b2f646425 (1 revision) (flutter/flutter#183383)
2026-03-08 engine-flutter-autoroll@skia.org Roll Skia from af994ae4d990 to 254e44141861 (2 revisions) (flutter/flutter#183377)

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mboetger pushed a commit to mboetger/flutter that referenced this pull request Mar 26, 2026
…lutter#182643)

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- Implements `ClipRSuperellipse` on backdrop filter on platform view 

*List which issues are fixed by this PR. You must list at least one
issue. An issue is not required if the PR fixes something trivial like a
typo.*
Fixes flutter#179125 


*If you had to change anything in the [flutter/tests] repo, include a
link to the migration guide as per the [breaking change policy].*

## 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
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- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
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ahmedsameha1 pushed a commit to ahmedsameha1/flutter that referenced this pull request Apr 14, 2026
…lutter#182643)

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- Implements `ClipRSuperellipse` on backdrop filter on platform view 

*List which issues are fixed by this PR. You must list at least one
issue. An issue is not required if the PR fixes something trivial like a
typo.*
Fixes flutter#179125 


*If you had to change anything in the [flutter/tests] repo, include a
link to the migration guide as per the [breaking change policy].*

## 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 `///`).
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@Hari-07 Hari-07 deleted the backdrop-clip-rse branch June 4, 2026 01:00
creatorpiyush pushed a commit to creatorpiyush/packages that referenced this pull request Jun 10, 2026
…r#11222)

Roll Flutter from 2ec61af30672 to 195ae7b3a122 (36 revisions)

flutter/flutter@2ec61af...195ae7b

2026-03-10 mdebbar@google.com [web] Updates to the README (flutter/flutter#176292)
2026-03-10 jason-simmons@users.noreply.github.com [Impeller] Do not log VK_ERROR_SURFACE_LOST_KHR errors returned by vkAcquireNextImageKHR (flutter/flutter#183338)
2026-03-10 jason-simmons@users.noreply.github.com DlDeferredImageGPUImpeller::ImageWrapper texture thread safety improvements (flutter/flutter#183429)
2026-03-10 34465683+rkishan516@users.noreply.github.com refactor: remove material imports from system_context_menu_test, table_test (flutter/flutter#183368)
2026-03-10 34465683+rkishan516@users.noreply.github.com refactor: remove material from baseline_test, slivers_test (flutter/flutter#183367)
2026-03-10 30870216+gaaclarke@users.noreply.github.com Migrated circle sdf to euclidean 2d derivative (flutter/flutter#183184)
2026-03-10 engine-flutter-autoroll@skia.org Roll Packages from c717018 to ee460d6 (2 revisions) (flutter/flutter#183451)
2026-03-10 engine-flutter-autoroll@skia.org Roll Skia from 68f24903b592 to 4b35832cc7ea (1 revision) (flutter/flutter#183449)
2026-03-10 engine-flutter-autoroll@skia.org Roll Skia from 8eda160375ea to 68f24903b592 (1 revision) (flutter/flutter#183444)
2026-03-10 engine-flutter-autoroll@skia.org Roll Skia from e7b957806202 to 8eda160375ea (2 revisions) (flutter/flutter#183440)
2026-03-10 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from ox-II3wPpa818y78_... to 8C_qfgWgoNhkV0_Mn... (flutter/flutter#183437)
2026-03-10 engine-flutter-autoroll@skia.org Roll Skia from 887df915a95e to e7b957806202 (1 revision) (flutter/flutter#183434)
2026-03-10 brackenavaron@gmail.com Remove material from scrollable_test.dart (flutter/flutter#181429)
2026-03-09 737941+loic-sharma@users.noreply.github.com Update 'a: text input' globs (flutter/flutter#183405)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from 3aa442e0624a to 887df915a95e (7 revisions) (flutter/flutter#183423)
2026-03-09 47866232+chunhtai@users.noreply.github.com Adds geometry dirty nodes (flutter/flutter#180375)
2026-03-09 engine-flutter-autoroll@skia.org Roll Dart SDK from 5b1aa4f8db14 to ebef6c849489 (1 revision) (flutter/flutter#183417)
2026-03-09 Veselblu@yandex.ru Add Alexander Dmitriev to AUTHORS (flutter/flutter#183357)
2026-03-09 katelovett@google.com Update org triage (flutter/flutter#183254)
2026-03-09 8847263+littleGnAl@users.noreply.github.com [Android] Avoid plugin auto-registration during FlutterFragmentActivity recreate timing window (flutter/flutter#182963)
2026-03-09 chingjun@google.com Standardize skia includes. (flutter/flutter#183404)
2026-03-09 116356835+AbdeMohlbi@users.noreply.github.com Add a note to `arcTo` docs about the 2PI drawing angle issue (flutter/flutter#183293)
2026-03-09 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#183411)
2026-03-09 bkonyi@google.com [ Tool ] Fix --print-dtd not working for web targets (flutter/flutter#183171)
2026-03-09 victorsanniay@gmail.com Add await or ignore lint to flutter_driver unawaited callsites (flutter/flutter#183334)
2026-03-09 30870216+gaaclarke@users.noreply.github.com Cleanup MockVulkan when the vulkan instance is destroyed (flutter/flutter#183324)
2026-03-09 52160996+FMorschel@users.noreply.github.com Updates tests commit (flutter/flutter#183301)
2026-03-09 22373191+Hari-07@users.noreply.github.com Implements `ClipRSuperellipse` on backdrop filter on platform view (flutter/flutter#182643)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from ea4fd0e1472a to 3aa442e0624a (1 revision) (flutter/flutter#183397)
2026-03-09 engine-flutter-autoroll@skia.org Roll Dart SDK from 050b2f646425 to 5b1aa4f8db14 (1 revision) (flutter/flutter#183393)
2026-03-09 engine-flutter-autoroll@skia.org Roll Packages from fe3de64 to c717018 (10 revisions) (flutter/flutter#183396)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from a83dca75c531 to ea4fd0e1472a (1 revision) (flutter/flutter#183389)
2026-03-09 engine-flutter-autoroll@skia.org Roll Skia from 254e44141861 to a83dca75c531 (7 revisions) (flutter/flutter#183388)
2026-03-09 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from giLoee6arX5CRHuRh... to ox-II3wPpa818y78_... (flutter/flutter#183386)
2026-03-09 engine-flutter-autoroll@skia.org Roll Dart SDK from 1604910613c7 to 050b2f646425 (1 revision) (flutter/flutter#183383)
2026-03-08 engine-flutter-autoroll@skia.org Roll Skia from af994ae4d990 to 254e44141861 (2 revisions) (flutter/flutter#183377)

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Implement ClipRSuperellipse on backdrop filter

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