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  • Convert the source rectangle to texture coordinates and shrink it to adjust for linear filtering
  • Pass the coordinates of the rectangle in the order expected by the Porter-Duff shader

Fixes #176544

…nts with the strict mode for nine-patch images

* Convert the source rectangle to texture coordinates and shrink it to adjust for linear filtering
* Pass the coordinates of the rectangle in the order expected by the Porter-Duff shader

Fixes flutter#176544
@github-actions github-actions bot added engine flutter/engine related. See also e: labels. e: impeller Impeller rendering backend issues and features requests labels Oct 31, 2025
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Code Review

This pull request fixes an issue with rendering nine-patch images in strict mode by correctly converting the source rectangle to texture coordinates and shrinking it to prevent linear filtering artifacts. It also corrects the order of coordinates passed to the Porter-Duff shader. A new test case is included to verify the fix. My review identified a minor documentation style issue, for which I have provided a suggestion.

@jason-simmons jason-simmons added the autosubmit Merge PR when tree becomes green via auto submit App label Nov 3, 2025
@auto-submit auto-submit bot added this pull request to the merge queue Nov 3, 2025
Merged via the queue into flutter:master with commit 633d659 Nov 3, 2025
187 checks passed
@flutter-dashboard flutter-dashboard bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Nov 3, 2025
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Nov 3, 2025
…AtlasContents with the strict mode for nine-patch images (flutter/flutter#177860)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Nov 3, 2025
…AtlasContents with the strict mode for nine-patch images (flutter/flutter#177860)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Nov 3, 2025
…AtlasContents with the strict mode for nine-patch images (flutter/flutter#177860)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Nov 3, 2025
…AtlasContents with the strict mode for nine-patch images (flutter/flutter#177860)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Nov 4, 2025
…AtlasContents with the strict mode for nine-patch images (flutter/flutter#177860)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Nov 4, 2025
…AtlasContents with the strict mode for nine-patch images (flutter/flutter#177860)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Nov 4, 2025
…AtlasContents with the strict mode for nine-patch images (flutter/flutter#177860)
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Nov 4, 2025
…AtlasContents with the strict mode for nine-patch images (flutter/flutter#177860)
auto-submit bot pushed a commit to flutter/packages that referenced this pull request Nov 4, 2025
Roll Flutter from 027f2e410241 to e5d5c01850f2 (73 revisions)

flutter/flutter@027f2e4...e5d5c01

2025-11-04 [email protected] [web] Upgrade Chrome to 141 (for engine tests) (flutter/flutter#177743)
2025-11-04 [email protected] Replace deprecated withOpacity in `chip_animation_style.0.dart‎`  example (flutter/flutter#177834)
2025-11-04 [email protected] Roll Skia from 03612114a36d to c89b6118266b (1 revision) (flutter/flutter#177991)
2025-11-04 [email protected] [web] Delete unused futurize util (flutter/flutter#177861)
2025-11-04 [email protected] Roll Skia from 1a179581af75 to 03612114a36d (1 revision) (flutter/flutter#177984)
2025-11-04 [email protected] Roll Skia from 150f844e83fb to 1a179581af75 (3 revisions) (flutter/flutter#177979)
2025-11-04 [email protected] Roll Dart SDK from 6f1bd8d05b1d to 156bf665dba4 (2 revisions) (flutter/flutter#177976)
2025-11-04 [email protected] Roll Skia from 3990fc40acdf to 150f844e83fb (1 revision) (flutter/flutter#177964)
2025-11-04 [email protected] Roll Skia from 85adfd3b8e75 to 3990fc40acdf (1 revision) (flutter/flutter#177962)
2025-11-04 [email protected] Fix `isHeif` crash (flutter/flutter#177944)
2025-11-04 [email protected] Roll Dart SDK from ac065fcd782e to 6f1bd8d05b1d (1 revision) (flutter/flutter#177955)
2025-11-04 [email protected] Roll Skia from 001516d132f0 to 85adfd3b8e75 (4 revisions) (flutter/flutter#177958)
2025-11-04 [email protected] [ Widget Preview ] Add analytic event that's reported when the previewer is opened (flutter/flutter#177949)
2025-11-04 [email protected] Marks Linux_pixel_7pro dynamic_path_stroke_tessellation_perf__timeline_summary to be unflaky (flutter/flutter#171144)
2025-11-03 [email protected] Roll Skia from da9b8fb01101 to 001516d132f0 (6 revisions) (flutter/flutter#177951)
2025-11-03 [email protected] Add FAQ entry about our attempts to remove Skia image codecs. (flutter/flutter#177947)
2025-11-03 [email protected] Add blockAccessibilityFocus flag (flutter/flutter#175551)
2025-11-03 [email protected] Make sure that a SnackBarAction doesn't crash in 0x0 environment (flutter/flutter#177899)
2025-11-03 [email protected] Make sure that a SelectionArea doesn't crash in 0x0 environment (flutter/flutter#177876)
2025-11-03 [email protected] Speculative fix for android_verified_input_test (flutter/flutter#177937)
2025-11-03 [email protected] [skia] Explicitly disable XPS backend (flutter/flutter#177050)
2025-11-03 [email protected] Roll Dart SDK from 2d3aa1d5cb9f to ac065fcd782e (2 revisions) (flutter/flutter#177927)
2025-11-03 [email protected] Improve Impeller's docs in the top-level docs folder (flutter/flutter#177848)
2025-11-03 [email protected] Make sure that GridTile doesn't crash in 0x0 environment (flutter/flutter#175321)
2025-11-03 [email protected] Make sure that a Slider doesn't crash in 0x0 environment (flutter/flutter#177882)
2025-11-03 [email protected] fix(impeller): fix params to glDiscardFrameBufferEXT (flutter/flutter#175589)
2025-11-03 [email protected] Roll Skia from 56a10bf56ee0 to da9b8fb01101 (5 revisions) (flutter/flutter#177928)
2025-11-03 [email protected] wires up set application locale to web engine (flutter/flutter#177284)
2025-11-03 [email protected] [Android 16] Update `linux_android_emu_unstable` to use avd rev 7 (flutter/flutter#177854)
2025-11-03 [email protected] Make sure that a CheckedPopupMenuItem doesn't crash in 0x0 environment (flutter/flutter#177545)
2025-11-03 [email protected] Roll Fuchsia Linux SDK from Ynp3qiXocK8WLTjlb... to vxK5obzfr1X9P2kSh... (flutter/flutter#177917)
2025-11-03 [email protected] Update pubspec.yaml.tmpl build version tracker on line 5 (flutter/flutter#173600)
2025-11-03 [email protected] [Impeller] Fix the source rectangle used when rendering an AtlasContents with the strict mode for nine-patch images (flutter/flutter#177860)
2025-11-03 [email protected] docs: Default Splash / Loading screen for web app in index.html (flutter/flutter#177084)
2025-11-03 [email protected] Roll Skia from 25e1e4e96980 to 56a10bf56ee0 (6 revisions) (flutter/flutter#177910)
2025-11-03 [email protected] Make sure that a PopupMenuItem doesn't crash in 0x0 environment (flutter/flutter#177533)
2025-11-03 [email protected] Make sure that a RefreshProgressIndicator doesn't crash in 0x0 enviro… (flutter/flutter#177556)
2025-11-03 [email protected] Make sure that a PopupMenuButton doesn't crash in 0x0 environment (flutter/flutter#177493)
2025-11-03 [email protected] Make sure that a CircularProgressIndicator doesn't crash in 0x0 envir… (flutter/flutter#177555)
2025-11-02 [email protected] Make sure that a Radio doesn't crash in 0x0 environment (flutter/flutter#177580)
2025-11-02 [email protected] Make sure that a RadioListTile doesn't crash in 0x0 environment (flutter/flutter#177576)
2025-11-02 [email protected] Make sure that an ExpandIcon doesn't crash in 0x0 envrionment (flutter/flutter#175042)
2025-11-02 [email protected] Make sure that a RangeSlider doesn't crash in 0x0 environment (flutter/flutter#177642)
2025-11-02 [email protected] Make sure that a GridTileBar doesn't crash in 0x0 environment (flutter/flutter#177546)
2025-11-02 [email protected] Make sure that a LinearProgressIndicator doesn't crash in 0x0 environ… (flutter/flutter#177553)
2025-11-02 [email protected] Make sure that a PopupMenuDivider doesn't crash in 0x0 environment (flutter/flutter#177445)
...
IvoneDjaja pushed a commit to IvoneDjaja/flutter that referenced this pull request Nov 22, 2025
…nts with the strict mode for nine-patch images (flutter#177860)

* Convert the source rectangle to texture coordinates and shrink it to
adjust for linear filtering
* Pass the coordinates of the rectangle in the order expected by the
Porter-Duff shader

Fixes flutter#176544
reidbaker pushed a commit to AbdeMohlbi/flutter that referenced this pull request Dec 10, 2025
…nts with the strict mode for nine-patch images (flutter#177860)

* Convert the source rectangle to texture coordinates and shrink it to
adjust for linear filtering
* Pass the coordinates of the rectangle in the order expected by the
Porter-Duff shader

Fixes flutter#176544
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[Impeller] nine-patch images not rendering correctly when a colorFilter is applied

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