[Impeller] Uneven letter spacing. #127815
Description
Starting from Flutter 3.10, Impeller is used by default on iOS. Small text seems to have broken kerning
Steps to reproduce
-
Create new app
-
Add small text (better noticeable on repeated letters)
Text('IIIIIIIII')- Run the app with Flutter 3.10.2 on iOS
Expected results
The letters should render with even visual spacing (like it was in Skia)
Actual results
The letters renders with uneven visual spacing
In real text it gives the impression of sloppy jumping letters
Details
Full code sample
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: Material(
color: Colors.white,
child: Center(
child: Text(
'IIIIIIIII',
style: TextStyle(
color: Colors.black,
),
),
),
),
);
}
}To reproduce old Skia behavior on Flutter 3.10
flutter run --no-enable-impellerTo crop and scale screenshot (iPhone 14):
convert screenshot.png -gravity center -crop 120x40+0+0 -scale 800% out.pngTools versions
Flutter (Channel stable, 3.10.2, on macOS 13.3.1 22E261 darwin-arm64, locale en-RU)
Xcode - develop for iOS and macOS (Xcode 14.3)
Android Studio (version 2022.2)
Flutter 3.10.2 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 9cd3d0d9ff (6 days ago) • 2023-05-23 20:57:28 -0700
Engine • revision 90fa3ae28f
Tools • Dart 3.0.2 • DevTools 2.23.1All the same on master:
Flutter 3.11.0-14.0.pre.70 • channel master •
https://github.com/flutter/flutter.git
Framework • revision bd11ef06fd (8 hours ago) • 2023-05-29 11:50:25 -0400
Engine • revision f768be1078
Tools • Dart 3.1.0 (build 3.1.0-155.0.dev) • DevTools 2.23.1Metadata
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Important issues not at the top of the work listText rendering, possibly libtxtIt was better in the past than it is nowImpeller rendering backend issues and features requestsflutter/engine related. See also e: labels.Found to occur in 3.10Found to occur in 3.11The issue has been confirmed reproducible and is ready to work oniOS applications specificallyIssue is closed as already fixed in a newer versionEngine binary size reduction. go/slimpellerOwned by Engine teamTriaged by Engine team
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