[IOS]Image.toByteData() is super slow on Flutter 3
#106773
Labels
a: images
Loading, displaying, rendering images
c: performance
Relates to speed or footprint issues (see "perf:" labels)
c: regression
It was better in the past than it is now
engine
flutter/engine repository. See also e: labels.
found in release: 3.0
Found to occur in 3.0
found in release: 3.1
Found to occur in 3.1
has reproducible steps
The issue has been confirmed reproducible and is ready to work on
platform-ios
iOS applications specifically
r: duplicate
Issue is closed as a duplicate of an existing issue
Comments
|
#104300 same issues, because it was closed,so I had to create a new one. |
ssyzh
changed the title
|
Hi @ssyzh, Thanks for filing the issue. I am able to reproduce the issue. Compared to stable 2.10.5 I am seeing 3x delay on the latest stable and the master channel on IOS. While the results are nearly the same on Android code sampleimport 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final GlobalKey sharePageKey = GlobalKey();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: RepaintBoundary(
key: sharePageKey,
child: Column(
children: [
Text(List.generate(200, (index) => "Text").join("#")),
Image.network(
"http://pic1.win4000.com/wallpaper/2020-10-10/5f811214aa09e.jpg",
width: double.infinity,
),
],
),
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
createImage();
},
child: const Text("create"),
),
);
}
createImage() async {
final stopWatch = Stopwatch();
stopWatch.start();
debugPrint("tim0 ${DateTime.now()}");
BuildContext? buildContext = sharePageKey.currentContext;
if (null != buildContext) {
RenderRepaintBoundary boundary =
buildContext.findRenderObject() as RenderRepaintBoundary;
ui.Image image = await boundary.toImage(pixelRatio: 5);
ByteData? byteData =
await image.toByteData(format: ui.ImageByteFormat.png);
if (byteData != null) {
var pngBytes = byteData.buffer.asUint8List();
debugPrint("time elapsed in (ms) = ${stopWatch.elapsedMilliseconds}");
}
stopWatch.stop();
}
}
}
logs(Android stable 3.0.3) Roughly 1.5 secslogs(ios flutter 3.0.3 stable/ 3.1.0 master) takes around 3-3.2 secslogs (ios) stable 2.10.5 takes 700-800msflutter doctor -v (mac) |
maheshmnj
added
c: regression
maheshmnj
changed the title
Image.toByteData() is super slow on Flutter 3
|
This started with a change to the engine's thread priorities (flutter/engine@5140a44) The image encoding work is done on the IO thread, which is configured with a reduced priority. Is anyone seeing significant issues on a real device? Or is this only affecting iOS simulators? |
iPhone XR , iPhone x, and iPhone 13, These are my real devices，and test in release mode. |
In addition, it seems that the release mode is slower than the debug mode, and in the debug mode, it is not necessarily slow every time, but most of the time. |
|
Very slow for iOS devices in release mode :( |
8 tasks
|
This is a duplicate of #107351 which is under discussion. Fixing that will resolve this as well. |
maheshmnj
added
the
r: duplicate
|
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of |
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image.toByteDatatime consuming in flutter 2.10.5 and flutter 3.0.3, only in iOSSteps to Reproduce
flutter runon the code sampleExpected results: The total time should be about the same
Actual results: 847ms and 8942ms, nearly eight times the difference! Even the real machine in release runs very very slow，eight times the difference!.
Code sample
Logs
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