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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:ui' as ui;
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
class TestCanvas implements Canvas {
final List<Invocation> invocations = <Invocation>[];
@override
void noSuchMethod(Invocation invocation) {
invocations.add(invocation);
}
}
void main() {
late ui.Image image300x300;
late ui.Image image300x200;
setUpAll(() async {
image300x300 = await createTestImage(width: 300, height: 300, cache: false);
image300x200 = await createTestImage(width: 300, height: 200, cache: false);
});
setUp(() {
debugFlushLastFrameImageSizeInfo();
});
test('Cover and align', () async {
final TestCanvas canvas = TestCanvas();
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 200.0, 100.0),
image: image300x300,
fit: BoxFit.cover,
alignment: Alignment.centerLeft,
);
final Invocation command = canvas.invocations.firstWhere((Invocation invocation) {
return invocation.memberName == #drawImageRect;
});
expect(command, isNotNull);
expect(command.positionalArguments[0], equals(image300x300));
expect(command.positionalArguments[1], equals(const Rect.fromLTWH(0.0, 75.0, 300.0, 150.0)));
expect(command.positionalArguments[2], equals(const Rect.fromLTWH(50.0, 75.0, 200.0, 100.0)));
});
test('debugInvertOversizedImages', () async {
debugInvertOversizedImages = true;
expect(PaintingBinding.instance!.window.devicePixelRatio != 1.0, true);
final FlutterExceptionHandler? oldFlutterError = FlutterError.onError;
final List<String> messages = <String>[];
FlutterError.onError = (FlutterErrorDetails details) {
messages.add(details.exceptionAsString());
};
final TestCanvas canvas = TestCanvas();
const Rect rect = Rect.fromLTWH(50.0, 50.0, 100.0, 50.0);
paintImage(
canvas: canvas,
rect: rect,
image: image300x300,
debugImageLabel: 'TestImage',
fit: BoxFit.fill,
);
final List<Invocation> commands = canvas.invocations
.skipWhile((Invocation invocation) => invocation.memberName != #saveLayer)
.take(4)
.toList();
expect(commands[0].positionalArguments[0], rect);
final Paint paint = commands[0].positionalArguments[1] as Paint;
expect(
paint.colorFilter,
const ColorFilter.matrix(<double>[
-1, 0, 0, 0, 255,
0, -1, 0, 0, 255,
0, 0, -1, 0, 255,
0, 0, 0, 1, 0,
]),
);
expect(commands[1].memberName, #translate);
expect(commands[1].positionalArguments[0], 0.0);
expect(commands[1].positionalArguments[1], 75.0);
expect(commands[2].memberName, #scale);
expect(commands[2].positionalArguments[0], 1.0);
expect(commands[2].positionalArguments[1], -1.0);
expect(commands[3].memberName, #translate);
expect(commands[3].positionalArguments[0], 0.0);
expect(commands[3].positionalArguments[1], -75.0);
expect(
messages.single,
'Image TestImage has a display size of 300×150 but a decode size of 300×300, which uses an additional 234KB.\n\n'
'Consider resizing the asset ahead of time, supplying a cacheWidth parameter of 300, a cacheHeight parameter of 150, or using a ResizeImage.',
);
debugInvertOversizedImages = false;
FlutterError.onError = oldFlutterError;
});
test('debugInvertOversizedImages smaller than overhead allowance', () async {
debugInvertOversizedImages = true;
final FlutterExceptionHandler? oldFlutterError = FlutterError.onError;
final List<String> messages = <String>[];
FlutterError.onError = (FlutterErrorDetails details) {
messages.add(details.exceptionAsString());
};
try {
// Create a 290x290 sized image, which is ~24kb less than the allocated size,
// and below the default debugImageOverheadAllowance size of 128kb.
const Rect rect = Rect.fromLTWH(50.0, 50.0, 290.0, 290.0);
final TestCanvas canvas = TestCanvas();
paintImage(
canvas: canvas,
rect: rect,
image: image300x300,
debugImageLabel: 'TestImage',
fit: BoxFit.fill,
);
expect(messages, isEmpty);
} finally {
debugInvertOversizedImages = false;
FlutterError.onError = oldFlutterError;
}
});
test('centerSlice with scale ≠ 1', () async {
final TestCanvas canvas = TestCanvas();
paintImage(
canvas: canvas,
rect: const Rect.fromLTRB(10, 20, 430, 420),
image: image300x300,
scale: 2.0,
centerSlice: const Rect.fromLTRB(50, 40, 250, 260),
);
final Invocation command = canvas.invocations.firstWhere((Invocation invocation) {
return invocation.memberName == #drawImageNine;
});
expect(command, isNotNull);
expect(command.positionalArguments[0], equals(image300x300));
expect(command.positionalArguments[1], equals(const Rect.fromLTRB(100.0, 80.0, 500.0, 520.0)));
expect(command.positionalArguments[2], equals(const Rect.fromLTRB(20.0, 40.0, 860.0, 840.0)));
});
testWidgets('Reports Image painting', (WidgetTester tester) async {
late ImageSizeInfo imageSizeInfo;
int count = 0;
debugOnPaintImage = (ImageSizeInfo info) {
count += 1;
imageSizeInfo = info;
};
final TestCanvas canvas = TestCanvas();
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 200.0, 100.0),
image: image300x300,
debugImageLabel: 'test.png',
);
expect(count, 1);
expect(imageSizeInfo, isNotNull);
expect(imageSizeInfo.source, 'test.png');
expect(imageSizeInfo.imageSize, const Size(300, 300));
expect(imageSizeInfo.displaySize, const Size(200, 100) * PaintingBinding.instance!.window.devicePixelRatio);
// Make sure that we don't report an identical image size info if we
// redraw in the next frame.
tester.binding.scheduleForcedFrame();
await tester.pump();
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 200.0, 100.0),
image: image300x300,
debugImageLabel: 'test.png',
);
expect(count, 1);
debugOnPaintImage = null;
});
testWidgets('Reports Image painting - change per frame', (WidgetTester tester) async {
late ImageSizeInfo imageSizeInfo;
int count = 0;
debugOnPaintImage = (ImageSizeInfo info) {
count += 1;
imageSizeInfo = info;
};
final TestCanvas canvas = TestCanvas();
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 200.0, 100.0),
image: image300x300,
debugImageLabel: 'test.png',
);
expect(count, 1);
expect(imageSizeInfo, isNotNull);
expect(imageSizeInfo.source, 'test.png');
expect(imageSizeInfo.imageSize, const Size(300, 300));
expect(imageSizeInfo.displaySize, const Size(200, 100) * PaintingBinding.instance!.window.devicePixelRatio);
// Make sure that we don't report an identical image size info if we
// redraw in the next frame.
tester.binding.scheduleForcedFrame();
await tester.pump();
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 200.0, 150.0),
image: image300x300,
debugImageLabel: 'test.png',
);
expect(count, 2);
expect(imageSizeInfo, isNotNull);
expect(imageSizeInfo.source, 'test.png');
expect(imageSizeInfo.imageSize, const Size(300, 300));
expect(imageSizeInfo.displaySize, const Size(200, 150) * PaintingBinding.instance!.window.devicePixelRatio);
debugOnPaintImage = null;
});
testWidgets('Reports Image painting - no debug label', (WidgetTester tester) async {
late ImageSizeInfo imageSizeInfo;
int count = 0;
debugOnPaintImage = (ImageSizeInfo info) {
count += 1;
imageSizeInfo = info;
};
final TestCanvas canvas = TestCanvas();
paintImage(
canvas: canvas,
rect: const Rect.fromLTWH(50.0, 75.0, 200.0, 100.0),
image: image300x200,
);
expect(count, 1);
expect(imageSizeInfo, isNotNull);
expect(imageSizeInfo.source, '<Unknown Image(300×200)>');
expect(imageSizeInfo.imageSize, const Size(300, 200));
expect(imageSizeInfo.displaySize, const Size(200, 100) * PaintingBinding.instance!.window.devicePixelRatio);
debugOnPaintImage = null;
});
// See also the DecorationImage tests in: decoration_test.dart
}