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[Impeller] Add filterQuality support to ImageFilter.shader - #188544
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This pull request adds support for specifying FilterQuality when creating an ImageFilter from a custom fragment shader, propagating the sampling configuration through the Dart API, native bindings, and Impeller backend. Feedback on the changes highlights a missing initialization of the u_size uniform in the test shader, which could cause undefined behavior, and suggests refactoring the sampler loop in image_filter.cc to use a boolean flag instead of an index counter for simpler logic.
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@b-luk can you give this a first pass please. |
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Jun 29, 2026
…backdropShaderWithFilterQuality
…FilterQuality')`.
…r.shader honors FilterQuality')`.
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Jul 1, 2026
…nversion of width to double
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Still waiting on the changes requested from my latest comment at #188544 (comment)
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Recently busy, but I'll do it now. |
…t conversion to double
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@b-luk Done |
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autosubmit label was removed for flutter/flutter/188544, because This PR has not met approval requirements for merging. The PR author is not a member of flutter-hackers and needs 1 more review(s) in order to merge this PR.
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…12401) Manual roll Flutter from 2757a77a73df to e52f01c920ad (47 revisions) Manual roll requested by [email protected] flutter/flutter@2757a77...e52f01c 2026-07-31 [email protected] [Impeller] Execute PipelineCompileQueue jobs in the order that they were added (flutter/flutter#190262) 2026-07-31 [email protected] Roll Packages from 7d17fc8 to 5351d8c (5 revisions) (flutter/flutter#190351) 2026-07-31 [email protected] Roll Skia from dcbd015c9646 to 7ef86a5b0eb9 (4 revisions) (flutter/flutter#190347) 2026-07-31 [email protected] [Impeller] Do not acquire an unneeded image in KHRSwapchainVK if the swapchain must be recreated due to a size change (flutter/flutter#190116) 2026-07-31 [email protected] Remove the --enable-serial-gc engine flag (flutter/flutter#190310) 2026-07-31 [email protected] Migrate platform_channel_swift example to material_ui (flutter/flutter#190308) 2026-07-31 [email protected] macOS: Set static text accessibility role for read-only text fields (flutter/flutter#190330) 2026-07-31 [email protected] Roll Dart SDK from 96f49fc43f59 to c3acfc2479f6 (1 revision) (flutter/flutter#190336) 2026-07-31 [email protected] Roll Skia from 07f08414dd66 to dcbd015c9646 (1 revision) (flutter/flutter#190333) 2026-07-31 [email protected] [web] Autofill all AutofillGroup fields in semantics mode (flutter/flutter#187108) 2026-07-31 [email protected] iOS: Configure test task runner thread at display QoS (flutter/flutter#190283) 2026-07-31 [email protected] Roll Skia from a1109355de78 to 07f08414dd66 (5 revisions) (flutter/flutter#190328) 2026-07-31 [email protected] Support reduceMotion accessibility feature in MediaQuery (flutter/flutter#190287) 2026-07-30 [email protected] Roll Dart SDK from 43f7de5f4977 to 96f49fc43f59 (4 revisions) (flutter/flutter#190312) 2026-07-30 [email protected] fix: text selection two handles directionality. (flutter/flutter#179928) 2026-07-30 [email protected] Add java/gradle check when gradle crashes (flutter/flutter#189997) 2026-07-30 [email protected] [Impeller] Add filterQuality support to ImageFilter.shader (flutter/flutter#188544) 2026-07-30 [email protected] [flutter/flutter] Migrate multiple_windows example to material_ui (flutter/flutter#190313) 2026-07-30 [email protected] Roll Skia from 50cf67910462 to a1109355de78 (6 revisions) (flutter/flutter#190306) 2026-07-30 [email protected] Migrate swift xctests to Swift testing tests (flutter/flutter#187801) 2026-07-30 [email protected] Migrates the platform_channel example to material_ui (flutter/flutter#190253) 2026-07-30 [email protected] iOS: Drop unnecessary @mainactor from VSyncClientTests (flutter/flutter#190285) 2026-07-30 [email protected] Add nullptr check to isOpaque (flutter/flutter#189796) 2026-07-30 [email protected] [Flutter GPU] Bind uniforms and textures by cached reflection index (flutter/flutter#189820) 2026-07-30 [email protected] Migrate layers example to material_ui (flutter/flutter#190237) 2026-07-30 [email protected] Add `ShapeBorder` hit test fast paths (flutter/flutter#187962) 2026-07-30 [email protected] ci: mac-must-wait part duex (flutter/flutter#190295) 2026-07-30 [email protected] Roll Skia from 491301f393d1 to 50cf67910462 (3 revisions) (flutter/flutter#190294) 2026-07-30 [email protected] Roll Packages from dd11626 to 7d17fc8 (1 revision) (flutter/flutter#190293) 2026-07-30 [email protected] Roll Skia from 177de1940bf2 to 491301f393d1 (1 revision) (flutter/flutter#190279) 2026-07-30 [email protected] Roll Skia from b8bda91f02db to 177de1940bf2 (5 revisions) (flutter/flutter#190272) 2026-07-30 [email protected] Roll Fuchsia Linux SDK from J8rVTlBnjnUpuHYk3... to _J8wM3kyQpLN9wvRD... (flutter/flutter#190273) 2026-07-30 [email protected] Roll Skia from 78afc18c9ba0 to b8bda91f02db (3 revisions) (flutter/flutter#190268) 2026-07-30 [email protected] Revert: Split the platform and cpuArch part of TargetPlatform (flutter/flutter#190258) 2026-07-30 [email protected] Return null from RenderProxyBoxMixin.computeDryBaseline when the child has no baseline (flutter/flutter#189723) 2026-07-30 [email protected] Roll Skia from 6fea713d32ec to 78afc18c9ba0 (4 revisions) (flutter/flutter#190257) 2026-07-30 [email protected] Roll pub packages (flutter/flutter#190259) 2026-07-29 [email protected] [cross imports] Check examples cross imports (flutter/flutter#187662) 2026-07-29 [email protected] ci: mac verify binaries still has to wait on linux_host_engine (flutter/flutter#190239) 2026-07-29 [email protected] Adds analytics to macos impeller opt in/out (flutter/flutter#190220) 2026-07-29 [email protected] Roll Skia from 0f35bba4945c to 6fea713d32ec (6 revisions) (flutter/flutter#190230) 2026-07-29 [email protected] iOS: Fix Swift warning in TracingTests (flutter/flutter#190203) 2026-07-29 [email protected] Convert all gradle-wrapper.properties in /dev to use distribution 'bin' (flutter/flutter#190226) 2026-07-29 [email protected] Roll Packages from 3e63635 to dd11626 (11 revisions) (flutter/flutter#190216) ...
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Adds a
filterQualityargument toImageFilter.shaderso the implicitly bound image-filter input sampler can be configured instead of always using nearest-neighbor sampling.This threads the requested sampling quality through
dart:ui, DisplayList runtime-effect image filters, and Impeller’s runtime-effect texture input setup. The default remainsFilterQuality.noneto preserve existing behavior.This also adds regression coverage with a fractional-texel shader to verify that
BackdropFilter+ImageFilter.shaderhonorsFilterQuality, plus equality coverage for shader image filters that differ only by input sampling.Fixes #188365
No changes were required in the
flutter/testsrepo.Pre-launch Checklist
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