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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:math' as math;
import 'dart:typed_data';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:integration_test/integration_test.dart';
import 'package:wide_gamut_test/main.dart' as app;
// See: https://developer.apple.com/documentation/metal/mtlpixelformat/mtlpixelformatbgr10_xr.
double _decodeBGR10(int x) {
const double max = 1.25098;
const double min = -0.752941;
const double intercept = min;
const double slope = (max - min) / 1024.0;
return (x * slope) + intercept;
}
double _decodeHalf(int x) {
if (x == 0x7c00) {
return double.infinity;
}
if (x == 0xfc00) {
return -double.infinity;
}
final double sign = x & 0x8000 == 0 ? 1.0 : -1.0;
final int exponent = (x >> 10) & 0x1f;
final int fraction = x & 0x3ff;
if (exponent == 0) {
return sign * math.pow(2.0, -14) * (fraction / 1024.0);
} else {
return sign * math.pow(2.0, exponent - 15) * (1.0 + fraction / 1024.0);
}
}
bool _isAlmost(double x, double y, double epsilon) {
return (x - y).abs() < epsilon;
}
List<double> _deepRed = <double>[1.0931, -0.2268, -0.1501];
bool _findRGBAF16Color(
Uint8List bytes, int width, int height, List<double> color) {
final ByteData byteData = ByteData.sublistView(bytes);
expect(bytes.lengthInBytes, width * height * 8);
expect(bytes.lengthInBytes, byteData.lengthInBytes);
bool foundDeepRed = false;
for (int i = 0; i < bytes.lengthInBytes; i += 8) {
final int pixel = byteData.getUint64(i, Endian.host);
final double blue = _decodeHalf((pixel >> 32) & 0xffff);
final double green = _decodeHalf((pixel >> 16) & 0xffff);
final double red = _decodeHalf((pixel >> 0) & 0xffff);
if (_isAlmost(red, color[0], 0.01) &&
_isAlmost(green, color[1], 0.01) &&
_isAlmost(blue, color[2], 0.01)) {
foundDeepRed = true;
}
}
return foundDeepRed;
}
bool _findBGRA10Color(
Uint8List bytes, int width, int height, List<double> color) {
final ByteData byteData = ByteData.sublistView(bytes);
expect(bytes.lengthInBytes, width * height * 8);
expect(bytes.lengthInBytes, byteData.lengthInBytes);
bool foundDeepRed = false;
for (int i = 0; i < bytes.lengthInBytes; i += 8) {
final int pixel = byteData.getUint64(i, Endian.host);
final double blue = _decodeBGR10((pixel >> 6) & 0x3ff);
final double green = _decodeBGR10((pixel >> 22) & 0x3ff);
final double red = _decodeBGR10((pixel >> 38) & 0x3ff);
if (_isAlmost(red, color[0], 0.01) &&
_isAlmost(green, color[1], 0.01) &&
_isAlmost(blue, color[2], 0.01)) {
foundDeepRed = true;
}
}
return foundDeepRed;
}
bool _findBGR10Color(
Uint8List bytes, int width, int height, List<double> color) {
final ByteData byteData = ByteData.sublistView(bytes);
expect(bytes.lengthInBytes, width * height * 4);
expect(bytes.lengthInBytes, byteData.lengthInBytes);
bool foundDeepRed = false;
for (int i = 0; i < bytes.lengthInBytes; i += 4) {
final int pixel = byteData.getUint32(i, Endian.host);
final double blue = _decodeBGR10(pixel & 0x3ff);
final double green = _decodeBGR10((pixel >> 10) & 0x3ff);
final double red = _decodeBGR10((pixel >> 20) & 0x3ff);
if (_isAlmost(red, color[0], 0.01) &&
_isAlmost(green, color[1], 0.01) &&
_isAlmost(blue, color[2], 0.01)) {
foundDeepRed = true;
}
}
return foundDeepRed;
}
bool _findColor(List<Object?> result, List<double> color) {
expect(result, isNotNull);
expect(result.length, 4);
final int width = (result[0] as int?)!;
final int height = (result[1] as int?)!;
final String format = (result[2] as String?)!;
if (format == 'MTLPixelFormatBGR10_XR') {
return _findBGR10Color((result[3] as Uint8List?)!, width, height, color);
} else if (format == 'MTLPixelFormatBGRA10_XR') {
return _findBGRA10Color((result[3] as Uint8List?)!, width, height, color);
} else if (format == 'MTLPixelFormatRGBA16Float') {
return _findRGBAF16Color((result[3] as Uint8List?)!, width, height, color);
} else {
fail('Unsupported pixel format: $format');
}
}
void main() {
IntegrationTestWidgetsFlutterBinding.ensureInitialized();
group('end-to-end test', () {
testWidgets('look for display p3 deepest red', (WidgetTester tester) async {
app.run(app.Setup.image);
await tester.pumpAndSettle(const Duration(seconds: 2));
const MethodChannel channel = MethodChannel('flutter/screenshot');
final List<Object?> result =
await channel.invokeMethod('test') as List<Object?>;
expect(_findColor(result, _deepRed), isTrue);
});
testWidgets('look for display p3 deepest red', (WidgetTester tester) async {
app.run(app.Setup.canvasSaveLayer);
await tester.pumpAndSettle(const Duration(seconds: 2));
const MethodChannel channel = MethodChannel('flutter/screenshot');
final List<Object?> result =
await channel.invokeMethod('test') as List<Object?>;
expect(_findColor(result, _deepRed), isTrue);
});
testWidgets('no p3 deepest red without image', (WidgetTester tester) async {
app.run(app.Setup.none);
await tester.pumpAndSettle(const Duration(seconds: 2));
const MethodChannel channel = MethodChannel('flutter/screenshot');
final List<Object?> result =
await channel.invokeMethod('test') as List<Object?>;
expect(_findColor(result, _deepRed), isFalse);
expect(_findColor(result, <double>[0.0, 1.0, 0.0]), isFalse);
});
testWidgets('p3 deepest red with blur', (WidgetTester tester) async {
app.run(app.Setup.blur);
await tester.pumpAndSettle(const Duration(seconds: 2));
const MethodChannel channel = MethodChannel('flutter/screenshot');
final List<Object?> result =
await channel.invokeMethod('test') as List<Object?>;
expect(_findColor(result, _deepRed), isTrue);
expect(_findColor(result, <double>[0.0, 1.0, 0.0]), isTrue);
});
testWidgets('draw image with wide gamut works', (WidgetTester tester) async {
app.run(app.Setup.drawnImage);
await tester.pumpAndSettle(const Duration(seconds: 2));
const MethodChannel channel = MethodChannel('flutter/screenshot');
final List<Object?> result =
await channel.invokeMethod('test') as List<Object?>;
expect(_findColor(result, <double>[0.0, 1.0, 0.0]), isTrue);
});
});
}