[Engine] iOS style blurring #175458

dkwingsmt · 2025-09-16T22:54:50Z

This PR adds the engine support for a new iOS-style blur. It works by adding parameters to the blur filter that specify its blurring bounds.

This is the engine-side implementation. The corresponding framework changes that expose this to developers are in:

Framework PR: [Framework] iOS style blurring and ImageFilterConfig #175473

Related issues:

Main tracking issue: Surrounding color leaks into widgets when BackdropFilter with ImageFilter.blur is applied #99691
Algorithm details: Cupertino blurry surfaces (such as CupertinoAlertDialog) should not source out-of-clip content #164267 (comment)

Design doc & previous discussions: flutter.dev/go/ios-style-blur-support

The Visual (Before & After)

This new mode, which I'm calling "bounded blur," is different from the traditional (global) gaussian blur in that blurs would not sample transparent pixels from outside the provided area.

The demo below shows the old blur (left) and the new bounded blur (right). Both are blurring a black triangle.

Notice the new version on the right no longer has the bright "lining" at the top and left edges. This is because the blur algorithm now knows its own bounds and correctly stops sampling pixels from outside that area.

Technical details

API Change

To pass the bounds information down, I've added new parameters to _initBlur:

  // painting.dart
  external void _initBlur(
    double sigmaX,
    double sigmaY,
    int tileMode,
    bool bounded,  // Start of new parameters
    double boundsLeft,
    double boundsTop,
    double boundsRight,
    double boundsBottom,
  );

How the Bounds Are Used

These bounds are passed all the way down to GaussianBlurFilterContents and affect two key parts of the process:

Downsampling Pass: The shader is instructed not to sample any pixels outside the provided bounds.
Blurring Passes: The final blurred result is divided by the resulting opacity. This normalizes the varying alpha (due to varying sum of weights) across the pixels near the edge.

Notable Engine Changes

To handle the downsampling logic, I created a new downsampling shader texture_downsample_bounded.

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.

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gaaclarke

Generally I'm good with the approach. It's on a good trajectory. You need to add a golden test to aiks_dl_blur_unittests.

engine/src/flutter/display_list/effects/image_filters/dl_blur_image_filter.h

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

gaaclarke · 2025-09-17T16:53:15Z

engine/src/flutter/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc

+        pass.SetPipeline(
+            renderer.GetDownsampleSoftwareDecalPipeline(pipeline_options));
+        Rect bounds_rect =
+            pass_args.bounds_uv.value_or(Rect::MakeLTRB(0, 0, 1, 1));


Does this match old behavior when setting the bounds to (0,0,1,1)? Seems like that is potentially doing clipping that wasn't happening before?

It should match the old behavior.

The if branch works in the following way: (I've added this new commment above this statement)

// If the blur is unbounded, then the pipeline is selected based on // whether the platform supports decal tile mode: The GLES backend // conditionally supports decal tile mode, while decal is always supported // for Vulkan and Metal. // // If the blur is bounded, software decal is always needed.

So there are two ways to enter the else branch. The first way is that the blur is unbounded, and the else branch is chosen because of GLES, corresponding to GetDownsampleTextureGlesPipeline before the PR, whose behavior was defined by the Sample as follows:

vec4 Sample(vec2 uv) { #ifdef SUPPORTS_DECAL // 0 for GLES return texture(texture_sampler, uv, float16_t(kDefaultMipBias)); #else if ((uv.x < 0 || uv.y < 0 || uv.x > 1 || uv.y > 1)) { return vec4(0); } else { return texture(texture_sampler, uv, float16_t(kDefaultMipBias)); } #endif }

The Sample function always checks the coord against (0,0,1,1).

The second way is that the blur is bounded. In this case the coord is checked against the bounds.

engine/src/flutter/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc

gaaclarke · 2025-09-17T17:04:04Z

engine/src/flutter/impeller/entity/entity_unittests.cc

      case 0:
        blur = std::make_shared<GaussianBlurFilterContents>(
-            blur_sigma_x.sigma, blur_sigma_y.sigma,
+            blur_sigma_x.sigma, blur_sigma_y.sigma, std::nullopt,


This would be a good place to expand the arguments to be able to control this. It's not an automated test though so it's optional. It would be helpful for you probably to mess around with it.

I've attempted to mess around it but it's kind of complicated considering all the transform matrices and texture stuff. I think it'd be better done in a separate PR.

Did you get a chance to test how the bounded blur reacts to transforms?

Yes. As shown in the playground demo (in the latest comment) and the golden test, the blur bound respects the current transform matrix.

engine/src/flutter/impeller/entity/shaders/filters/gaussian.frag

gaaclarke · 2025-09-23T15:10:03Z

I don't know if you are ready yet, but I'm going to hold off reviewing again until we get this PR green through CI so we can see the goldens. Let me know if you need any help getting it through.

mdebbar · 2025-09-24T18:21:08Z

web part looks good!

flutter-dashboard · 2025-09-25T04:31:29Z

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 #175458 at sha 1d1f2a9

dkwingsmt · 2025-09-25T06:21:29Z

gaaclarke : I'm aware that the golden test isn't representative. Actually some maths of the shaders aren't right, and I've been trying to figure them out for days. I'll let you know when I made progress.

gaaclarke · 2025-09-25T15:36:32Z

I'm aware that the golden test isn't representative.

Thanks for the heads up. Let me know when you need me to look again.

flutter-dashboard · 2025-09-29T05:37:34Z

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Changes reported for pull request #175458 at sha 4735a79

flutter-dashboard · 2025-09-29T07:43:37Z

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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 #175458 at sha b7b2d9f

flutter-dashboard · 2025-09-29T21:24:41Z

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Changes reported for pull request #175458 at sha 005c218

dkwingsmt · 2025-10-02T20:01:54Z

I've completed the PR and it should be ready to review. Here are notable changes:

gaussian.frag is now controlled by a specialized constant bounded_blur.
Both branches of CalculateDownsamplePassArgs have been implemented and each tested by a golden test. Each golden test verifies two subcases: One has a non-zero offset and unclipped, and the other has a zero offset and clipped. (The latter one is possibly the only case that matters in practice.)
Regarding the two branches of MakeDownsampleSubpass, I've decided that the first branch, which reuses existing mipmap renderers, does not suit our case, since a bounded blur requires special treatment during downsampling.
I've added an interactive playground for bounded blurs.

Screen.Recording.2025-10-02.at.1.00.36.PM.mp4

I disabled the kernel lerp hack for bounded blurs. This was to reduce the wave-like artifacts close to edges (see video below).

Screen.Recording.2025-10-02.at.1.06.09.PM.mp4

Known issue: These artifacts are greatly reduced, although not completely gone, without the lerp hack. It becomes much more noticeable (but still better than with the lerp hack) if the texture is drawn with a non-zero offset. Fortunately in practice we should almost only draw texture with a zero-artifacts. I've investigated this for days in vain, and I've decided that the result is good enough for zero offset texture anyway.

flutter-dashboard · 2025-10-02T21:36:45Z

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Changes reported for pull request #175458 at sha d1cbd6a

gaaclarke · 2025-10-02T22:24:43Z

It's been a second since I looked at this. I think you may have answered this in the past but it wasn't captured. Can you remind me why we couldn't implement this by tweaking the downsample pass to conditionally the crop the gutter and set the tilemode to clamp?

So for example, in the case where we are blurring something that is running out of content it looks like this:

input:

[####]
[####]
[####]
[####]

downsample output:

[.....]
[.###.]
[.###.]
[.###.]
[.....]

Then the blur is executed on it. If instead the downsample output was similar to the input with a tilemode set to clamp, wouldn't that give you the same result?

dkwingsmt · 2025-12-22T19:34:59Z

@gaaclarke This PR is ready for a (hopefully final) review. For your convenience, here are the changes since the last review:

Commit c9e56b1 rewrote some documents to reflect the fact that tile_mode is always effective whether bounds is null or not.

It also adds another option "Tile mode" to the playground. As we analyzed the last time, tile mode can still affect bounded blur if the blur bound crosses texture bound. Check out the following video while paying attention to the top left corner of the window.

Screen.Recording.2025-12-22.at.11.04.56.AM.mov

Commit 8f59f39 reorders the parameters by placing bounds after tile_mode with a default value of std::nullopt if applicable. This is done for two reasons:

Since tile modes always apply while bounds don't, bounds feels like a lesser parameter and is more suitable being placed behind.
Placing bounds the last allows omitting this parameter when the blur is not bounded, reducing the lines of changes.

gaaclarke

lgtm, thanks for all the following up and clarifying. I'm happy with were we ended up.

gaaclarke · 2025-12-22T21:51:33Z

engine/src/flutter/lib/ui/painting.dart

  /// The `bounds` rectangle is specified in the canvas's current coordinate
-  /// space (it is affected by the current transform). Consequently, the bounds
-  /// may not be axis-aligned in canvas coordinates.
+  /// space and is affected by the current transform; consequently, the bounds
+  /// may not be axis-aligned in the final canvas coordinates.


No action required: I wish we had a canonical word for this coordinate space. I typically call it local coordinate space.

Yeah honestly I would call it "local coordinate" but I don't think it's clear enough for many people, which matters more.

dkwingsmt · 2025-12-22T22:30:12Z

@gaaclarke Thank you so much for patiently working through this PR with me!

flutter-dashboard · 2025-12-22T23:06:20Z

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 #175458 at sha 8f59f39

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[Framework] iOS style blurring and ImageFilterConfig #175473

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[Web] Implement bounded blur #175899

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Implementation details doc

73f45cb

Revert source_expanded_coverage_hint calc

b7c345e

Improve transform

b84ce5a

Revert settings json

c85c390

Doc

c9e56b1

Merge remote-tracking branch 'origin/main' into ios-blur2

c983920

Reorder bounds to be after tile_mode

8f59f39

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[Engine] iOS style blurring #175458

[Engine] iOS style blurring #175458

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The Visual (Before & After)

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How the Bounds Are Used

Notable Engine Changes

Pre-launch Checklist

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