Raster paint whole layer even only changed partial segment #65007
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fredlee12345678
added
the
from: performance template
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Hi @fredlee12345678 Please also share the actual vs expected results. Thank you |
pedromassangocode
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in triage
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
void main() {
// debugPaintLayerBordersEnabled = true;
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
// checkerboardOffscreenLayers: true,
checkerboardRasterCacheImages: true,
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
// This makes the visual density adapt to the platform that you run
// the app on. For desktop platforms, the controls will be smaller and
// closer together (more dense) than on mobile platforms.
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: GridView.builder(
itemCount: 12,
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 1,
mainAxisSpacing: 20.0,
crossAxisSpacing: 10.0,
childAspectRatio: 1.0),
itemBuilder: (context, index) {
return Image.asset('assets/$index');
}),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add,color: Colors.red,),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}Here is my asset fils. you can copy it to your project➜ bin git:(stable) ✗ ./flutter doctor -v [✓] Flutter (Channel stable, v1.17.5, on Mac OS X 10.15.5 19F101, locale zh-Hans-CN) [✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2) [✓] Xcode - develop for iOS and macOS (Xcode 11.6) [✓] Android Studio (version 3.6) [✓] IntelliJ IDEA Ultimate Edition (version 2019.2) [✓] Connected device (2 available) • No issues found! ====================================== My expect: |
no-response
bot
removed
the
waiting for customer response
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Sorry, where this picturelayer::paint is being called? Can you clarify how one can assert that (and where) is picturelayer::paint is being called? |
pedromassangocode
added
the
waiting for customer response
|
open devtools, can see the PictureLayer::Paint at Raster thread. |
no-response
bot
removed
the
waiting for customer response
pedromassangocode
added
a: images
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Possibly duplicate of #33939? |
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@knopp yes, it's same issue, so we can close this issue |
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Closing this one as a duplicate of #33939 |
|
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 |
Details
Target Platform: Android & IOS
Target OS version/browser:
Devices: All
Flutter Version : 1.17.5
Desctiption
I have a simple code is that :
Code:
body:GridView.builder(
itemCount: 500,
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 1,
mainAxisSpacing: 20.0,
crossAxisSpacing: 10.0,
childAspectRatio: 1.0),
itemBuilder: (context, index) {
return Image.asset('assets/$index');}
If I have an animated image , I found that raster task will paint the whole layer , not the changed layer. I think it's very poor performance. Why not just only paint the changed segment? Thanks
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