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Add a test for 3D transform with needsCompositing (#61779)

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Yuqian Li 2020-07-28 10:21:08 -07:00 committed by GitHub
parent 59e0a2ec28
commit 7c942e390f
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1 changed files with 42 additions and 0 deletions
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packages/flutter/test/widgets/transform_test.dart
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@ -5,6 +5,7 @@
// @dart = 2.8
import 'dart:math' as math;
import 'dart:ui' as ui;
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/rendering.dart';
@ -360,4 +361,45 @@ void main() {
await tester.tap(find.byKey(key1));
expect(_pointerDown, isTrue);
});
Widget _generateTransform(bool needsCompositing, double angle) {
final Widget customPaint = CustomPaint(painter: TestRectPainter());
return Transform(
transform: MatrixUtils.createCylindricalProjectionTransform(
radius: 100,
angle: angle,
perspective: 0.003,
),
// A RepaintBoundary child forces the Transform to needsCompositing
child: needsCompositing ? RepaintBoundary(child: customPaint) : customPaint,
);
}
testWidgets(
'3D transform renders the same with or without needsCompositing',
(WidgetTester tester) async {
for (double angle = 0; angle <= math.pi/4; angle += 0.01) {
await tester.pumpWidget(RepaintBoundary(child: _generateTransform(true, angle)));
final RenderBox renderBox = tester.binding.renderView.child;
final OffsetLayer layer = renderBox.debugLayer as OffsetLayer;
final ui.Image imageWithCompositing = await layer.toImage(renderBox.paintBounds);
await tester.pumpWidget(RepaintBoundary(child: _generateTransform(false, angle)));
await expectLater(find.byType(RepaintBoundary).first, matchesReferenceImage(imageWithCompositing));
}
},
skip: isBrowser, // due to https://github.com/flutter/flutter/issues/42767
);
}
class TestRectPainter extends CustomPainter {
@override
void paint(ui.Canvas canvas, ui.Size size) {
canvas.drawRect(
const Offset(200, 200) & const Size(10, 10),
Paint()..color = const Color(0xFFFF0000),
);
}
@override
bool shouldRepaint(CustomPainter oldDelegate) => true;
}