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image_painting_event_test.dart
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image_painting_event_test.dart
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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'dart:convert' show jsonEncode;
import 'dart:developer' as developer;
import 'dart:typed_data';
import 'dart:ui' as ui;
import 'package:flutter/painting.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:vm_service/vm_service.dart';
import 'package:vm_service/vm_service_io.dart';
void main() {
VmService vmService;
LiveTestWidgetsFlutterBinding binding;
setUpAll(() async {
final developer.ServiceProtocolInfo info =
await developer.Service.getInfo();
if (info.serverUri == null) {
fail('This test _must_ be run with --enable-vmservice.');
}
vmService = await vmServiceConnectUri('ws://localhost:${info.serverUri.port}${info.serverUri.path}ws');
await vmService.streamListen(EventStreams.kExtension);
// Initialize bindings
binding = LiveTestWidgetsFlutterBinding();
binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive;
binding.attachRootWidget(const SizedBox.expand());
expect(binding.framesEnabled, true);
// Pump two frames to make sure we clear out any inter-frame comparisons.
await binding.endOfFrame;
await binding.endOfFrame;
});
test('Image painting events - deduplicates across frames', () async {
final Completer<Event> completer = Completer<Event>();
vmService.onExtensionEvent.first.then(completer.complete);
const TestImage image = TestImage(width: 300, height: 300);
final TestCanvas canvas = TestCanvas();
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 200.0, 100.0),
image: image,
debugImageLabel: 'test.png',
);
// Make sure that we don't report an identical image size info if we
// redraw in the next frame.
await binding.endOfFrame;
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 200.0, 100.0),
image: image,
debugImageLabel: 'test.png',
);
await binding.endOfFrame;
final Event event = await completer.future;
expect(event.extensionKind, 'Flutter.ImageSizesForFrame');
expect(
jsonEncode(event.extensionData.data),
'{"test.png":{"source":"test.png","displaySize":{"width":200.0,"height":100.0},"imageSize":{"width":300.0,"height":300.0},"displaySizeInBytes":106666,"decodedSizeInBytes":480000}}',
);
}, skip: isBrowser); // uses dart:isolate and io
test('Image painting events - deduplicates across frames', () async {
final Completer<Event> completer = Completer<Event>();
vmService.onExtensionEvent.first.then(completer.complete);
const TestImage image = TestImage(width: 300, height: 300);
final TestCanvas canvas = TestCanvas();
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 200.0, 100.0),
image: image,
debugImageLabel: 'test.png',
);
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 300.0, 300.0),
image: image,
debugImageLabel: 'test.png',
);
await binding.endOfFrame;
final Event event = await completer.future;
expect(event.extensionKind, 'Flutter.ImageSizesForFrame');
expect(
jsonEncode(event.extensionData.data),
'{"test.png":{"source":"test.png","displaySize":{"width":300.0,"height":300.0},"imageSize":{"width":300.0,"height":300.0},"displaySizeInBytes":480000,"decodedSizeInBytes":480000}}',
);
}, skip: isBrowser); // uses dart:isolate and io
}
class TestImage implements ui.Image {
const TestImage({this.height = 0, this.width = 0});
@override
final int height;
@override
final int width;
@override
void dispose() {}
@override
Future<ByteData> toByteData(
{ui.ImageByteFormat format = ui.ImageByteFormat.rawRgba}) {
throw UnimplementedError();
}
}
class TestCanvas implements Canvas {
@override
void noSuchMethod(Invocation invocation) {}
}