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[Impeller] Fix atlas growth test#189533

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flar:impeller-fix-atlas-growth-test
Jul 16, 2026
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[Impeller] Fix atlas growth test#189533
auto-submit[bot] merged 3 commits into
flutter:masterfrom
flar:impeller-fix-atlas-growth-test

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@flar flar commented Jul 15, 2026

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In short, the GlyphAtlasTextureWillGrowTilMaxTextureSize fails on MacOS desktops on the Vulkan back end using the MoltenVK SDK.

The test was written to expect specific size values from the atlas as it accumulated a number of text rendering operations, but those values were quite specific to an assumption that the maximum texture size was 16k. For the Mac, though, the maximum texture size is 32k which means the test doesn't see the atlas shrink at the expected glyph count and size. This PR rewrites the test to simply keep accumulating text operations until the atlas shrinks (indicating an overflow situation) and then checks the glyph count without having any expectations as to the specific sizes of the growth algorithm.

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@flutter-dashboard flutter-dashboard Bot added the CICD Run CI/CD label Jul 15, 2026
@github-actions github-actions Bot added engine flutter/engine related. See also e: labels. e: impeller Impeller rendering backend issues and features requests labels Jul 15, 2026

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Code Review

This pull request refactors the GlyphAtlasTextureWillGrowTilMaxTextureSize unit test in Impeller to dynamically detect atlas recreation by comparing the current atlas size against the previous size over up to 100 iterations, rather than asserting against hardcoded expected sizes. A review comment identifies that prev_atlas_size is read before initialization in the first loop iteration, which can lead to undefined behavior.

Comment thread engine/src/flutter/impeller/typographer/typographer_unittests.cc
@flar
flar requested a review from jason-simmons July 15, 2026 22:00
@flar flar added the autosubmit Merge PR when tree becomes green via auto submit App label Jul 16, 2026
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auto-submit Bot added this pull request to the merge queue Jul 16, 2026
Merged via the queue into flutter:master with commit 208dfb0 Jul 16, 2026
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@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Jul 16, 2026
auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Jul 18, 2026
Roll Flutter from fc1ad955f164 to 8005793c3562 (40 revisions)

flutter/flutter@fc1ad95...8005793

2026-07-18 [email protected] Remove `LineContents ` experimental AA line shader that is no longer used (flutter/flutter#189619)
2026-07-18 [email protected] Roll Skia from 9468e96cc40f to ba90f98535de (8 revisions) (flutter/flutter#189680)
2026-07-17 [email protected] Roll Dart SDK from 33e4b71e984b to 666e1e2133b7 (2 revisions) (flutter/flutter#189673)
2026-07-17 [email protected] [iOS] Fix potential use-after-free in a11y bridge channel handler (flutter/flutter#189637)
2026-07-17 [email protected] Migrate dev/tools skill validation to new dart_skills_lint API (flutter/flutter#189626)
2026-07-17 [email protected] Add validation for required fields during xcodebuild (flutter/flutter#187772)
2026-07-17 [email protected] Upgrade android_hardware_smoke_test CI to run instrumented tests (flutter/flutter#189390)
2026-07-17 [email protected] Roll Dart SDK from 0867cb1897b5 to 33e4b71e984b (1 revision) (flutter/flutter#189661)
2026-07-17 [email protected] Roll Skia from 702c3e790232 to 9468e96cc40f (1 revision) (flutter/flutter#189660)
2026-07-17 [email protected] Roll Packages from 9f95026 to 4fdc766 (11 revisions) (flutter/flutter#189659)
2026-07-17 [email protected] Roll Skia from 2e4a3ae035cd to 702c3e790232 (1 revision) (flutter/flutter#189655)
2026-07-17 [email protected] [macOS] Add FlutterPluginRegistrar.valuePublished(byPlugin:) just like iOS (flutter/flutter#189614)
2026-07-17 [email protected] Roll Dart SDK from c69d138c9646 to 0867cb1897b5 (2 revisions) (flutter/flutter#189649)
2026-07-17 [email protected] Roll Skia from 4f5aca109c87 to 2e4a3ae035cd (3 revisions) (flutter/flutter#189646)
2026-07-17 [email protected] [iOS] Fix missing nil checks and improve SemanticsObject bridge API (flutter/flutter#189630)
2026-07-17 [email protected] Roll Skia from 37c5e6b26aee to 4f5aca109c87 (19 revisions) (flutter/flutter#189638)
2026-07-17 [email protected] Roll Fuchsia Linux SDK from lLFbh5kFWbUGgC9Ek... to NL8xtzr8cxr5E8r8E... (flutter/flutter#189632)
2026-07-17 [email protected] Add blendMode parameter to RawImage and RenderImage (flutter/flutter#185938)
2026-07-17 [email protected] [web] Cache WASM network requests in flutter test (flutter/flutter#189623)
2026-07-17 [email protected] android_hardware_smoke_tests: Apply semantic line breaks to readme (flutter/flutter#189613)
2026-07-16 [email protected] ci(github-actions): resolve zizmor github-env findings in composite flutter actions (flutter/flutter#189602)
2026-07-16 [email protected] Remove obsolete packages analysis flag (flutter/flutter#189525)
2026-07-16 [email protected] Roll Dart SDK from e24870ff15bc to c69d138c9646 (2 revisions) (flutter/flutter#189597)
2026-07-16 [email protected] [fuchsia][iwyu] Remove transitive include of fuchsia.input.report. (flutter/flutter#188891)
2026-07-16 [email protected] Remove unnecessary value key hack in `key.dart`  (flutter/flutter#189291)
2026-07-16 [email protected] Roll Dart SDK from 81306a2ed317 to e24870ff15bc (1 revision) (flutter/flutter#189569)
2026-07-16 [email protected] [Impeller] Fix atlas growth test (flutter/flutter#189533)
2026-07-16 [email protected] Roll Dart SDK from d402ff7c9c84 to 81306a2ed317 (4 revisions) (flutter/flutter#189558)
2026-07-16 [email protected] Move shared darwin plugin tests into own builder (flutter/flutter#189411)
2026-07-16 [email protected] Roll Skia from ab2410bc857c to 37c5e6b26aee (19 revisions) (flutter/flutter#189549)
2026-07-16 [email protected] [ios] Fix //flutter:unittests build for physical devices (flutter/flutter#189543)
2026-07-16 [email protected] Fix lower DragTarget not being recognized in overlapping targets (flutter/flutter#188979)
2026-07-16 [email protected] Relocate cupertino samples that were under widgets/ (flutter/flutter#188876)
2026-07-15 [email protected] [iOS] Migrate DisplayLinkManager to a shared instance (flutter/flutter#189492)
2026-07-15 [email protected] [Impeller] Call glfwTerminate during global test environment teardown if a playground test called glfwInit (flutter/flutter#189523)
2026-07-15 [email protected] Roll pub packages (flutter/flutter#189515)
2026-07-15 [email protected] Roll Packages from ad2eab1 to 9f95026 (8 revisions) (flutter/flutter#189509)
2026-07-15 [email protected] add `@nonVirtual` to `RenderObject.attached`, fix `WidgetTester.hasRunningAnimations` (flutter/flutter#186832)
2026-07-15 [email protected] Roll vulkan-deps to 0582f446e54a (flutter/flutter#188524)
2026-07-15 [email protected] Roll Dart SDK from 0c408ff6dce9 to d402ff7c9c84 (1 revision) (flutter/flutter#189497)

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 [email protected],[email protected] on the revert to ensure that a human
is aware of the problem.
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