import 'dart:async';
import 'dart:typed_data';
import 'dart:ui';
import 'dart:isolate';
import 'dart:ffi';
import 'dart:core';
import 'dart:convert';

void main() {}

@pragma('vm:entry-point')
void customEntrypoint() {
  sayHiFromCustomEntrypoint();
}

void sayHiFromCustomEntrypoint() native 'SayHiFromCustomEntrypoint';


@pragma('vm:entry-point')
void customEntrypoint1() {
  sayHiFromCustomEntrypoint1();
  sayHiFromCustomEntrypoint2();
  sayHiFromCustomEntrypoint3();
}

void sayHiFromCustomEntrypoint1() native 'SayHiFromCustomEntrypoint1';
void sayHiFromCustomEntrypoint2() native 'SayHiFromCustomEntrypoint2';
void sayHiFromCustomEntrypoint3() native 'SayHiFromCustomEntrypoint3';


@pragma('vm:entry-point')
void invokePlatformTaskRunner() {
  window.sendPlatformMessage('OhHi', null, null);
}


Float64List kTestTransform = () {
  final Float64List values = Float64List(16);
  values[0] = 1.0;  // scaleX
  values[4] = 2.0;  // skewX
  values[12] = 3.0; // transX
  values[1] = 4.0;  // skewY
  values[5] = 5.0;  // scaleY
  values[13] = 6.0; // transY
  values[3] = 7.0;  // pers0
  values[7] = 8.0;  // pers1
  values[15] = 9.0; // pers2
  return values;
}();

void signalNativeTest() native 'SignalNativeTest';
void signalNativeCount(int count) native 'SignalNativeCount';
void signalNativeMessage(String message) native 'SignalNativeMessage';
void notifySemanticsEnabled(bool enabled) native 'NotifySemanticsEnabled';
void notifyAccessibilityFeatures(bool reduceMotion) native 'NotifyAccessibilityFeatures';
void notifySemanticsAction(int nodeId, int action, List<int> data) native 'NotifySemanticsAction';

/// Returns a future that completes when `window.onSemanticsEnabledChanged`
/// fires.
Future<void> get semanticsChanged {
  final Completer<void> semanticsChanged = Completer<void>();
  window.onSemanticsEnabledChanged = semanticsChanged.complete;
  return semanticsChanged.future;
}

/// Returns a future that completes when `window.onAccessibilityFeaturesChanged`
/// fires.
Future<void> get accessibilityFeaturesChanged {
  final Completer<void> featuresChanged = Completer<void>();
  window.onAccessibilityFeaturesChanged = featuresChanged.complete;
  return featuresChanged.future;
}

class SemanticsActionData {
  const SemanticsActionData(this.id, this.action, this.args);
  final int id;
  final SemanticsAction action;
  final ByteData args;
}

Future<SemanticsActionData> get semanticsAction {
  final Completer<SemanticsActionData> actionReceived = Completer<SemanticsActionData>();
  window.onSemanticsAction = (int id, SemanticsAction action, ByteData args) {
    actionReceived.complete(SemanticsActionData(id, action, args));
  };
  return actionReceived.future;
}

@pragma('vm:entry-point')
void a11y_main() async { // ignore: non_constant_identifier_names
  // Return initial state (semantics disabled).
  notifySemanticsEnabled(window.semanticsEnabled);

  // Await semantics enabled from embedder.
  await semanticsChanged;
  notifySemanticsEnabled(window.semanticsEnabled);

  // Return initial state of accessibility features.
  notifyAccessibilityFeatures(window.accessibilityFeatures.reduceMotion);

  // Await accessibility features changed from embedder.
  await accessibilityFeaturesChanged;
  notifyAccessibilityFeatures(window.accessibilityFeatures.reduceMotion);

  // Fire semantics update.
  final SemanticsUpdateBuilder builder = SemanticsUpdateBuilder()
    ..updateNode(
      id: 42,
      label: 'A: root',
      rect: Rect.fromLTRB(0.0, 0.0, 10.0, 10.0),
      transform: kTestTransform,
      childrenInTraversalOrder: Int32List.fromList(<int>[84, 96]),
      childrenInHitTestOrder: Int32List.fromList(<int>[96, 84]),
    )
    ..updateNode(
      id: 84,
      label: 'B: leaf',
      rect: Rect.fromLTRB(40.0, 40.0, 80.0, 80.0),
      transform: kTestTransform,
    )
    ..updateNode(
      id: 96,
      label: 'C: branch',
      rect: Rect.fromLTRB(40.0, 40.0, 80.0, 80.0),
      transform: kTestTransform,
      childrenInTraversalOrder: Int32List.fromList(<int>[128]),
      childrenInHitTestOrder: Int32List.fromList(<int>[128]),
    )
    ..updateNode(
      id: 128,
      label: 'D: leaf',
      rect: Rect.fromLTRB(40.0, 40.0, 80.0, 80.0),
      transform: kTestTransform,
      additionalActions: Int32List.fromList(<int>[21]),
      platformViewId: 0x3f3,
    )
    ..updateCustomAction(
      id: 21,
      label: 'Archive',
      hint: 'archive message',
    );
  window.updateSemantics(builder.build());
  signalNativeTest();

  // Await semantics action from embedder.
  final SemanticsActionData data = await semanticsAction;
  final List<int> actionArgs = <int>[data.args.getInt8(0), data.args.getInt8(1)];
  notifySemanticsAction(data.id, data.action.index, actionArgs);

  // Await semantics disabled from embedder.
  await semanticsChanged;
  notifySemanticsEnabled(window.semanticsEnabled);
}


@pragma('vm:entry-point')
void platform_messages_response() {
  window.onPlatformMessage = (String name, ByteData data, PlatformMessageResponseCallback callback) {
    callback(data);
  };
  signalNativeTest();
}

@pragma('vm:entry-point')
void platform_messages_no_response() {
  window.onPlatformMessage = (String name, ByteData data, PlatformMessageResponseCallback callback) {
    var list = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
    signalNativeMessage(utf8.decode(list));
    // This does nothing because no one is listening on the other side. But complete the loop anyway
    // to make sure all null checking on response handles in the engine is in place.
    callback(data);
  };
  signalNativeTest();
}

@pragma('vm:entry-point')
void null_platform_messages() {
  window.onPlatformMessage =
      (String name, ByteData data, PlatformMessageResponseCallback callback) {
    // This checks if the platform_message null data is converted to Flutter null.
    signalNativeMessage((null == data).toString());
    callback(data);
  };
  signalNativeTest();
}

Picture CreateSimplePicture() {
  Paint blackPaint = Paint();
  PictureRecorder baseRecorder = PictureRecorder();
  Canvas canvas = Canvas(baseRecorder);
  canvas.drawRect(Rect.fromLTRB(0.0, 0.0, 1000.0, 1000.0), blackPaint);
  return baseRecorder.endRecording();
}

@pragma('vm:entry-point')
void can_composite_platform_views() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.addPicture(Offset(1.0, 1.0), CreateSimplePicture());
    builder.pushOffset(1.0, 2.0);
    builder.addPlatformView(42, width: 123.0, height: 456.0);
    builder.addPicture(Offset(1.0, 1.0), CreateSimplePicture());
    builder.pop(); // offset
    signalNativeTest(); // Signal 2
    window.render(builder.build());
  };
  signalNativeTest(); // Signal 1
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void can_composite_platform_views_with_opacity() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();

    // Root node
    builder.pushOffset(1.0, 2.0);

    // First sibling layer (no platform view, should be cached)
    builder.pushOpacity(127);
    builder.addPicture(Offset(1.0, 1.0), CreateSimplePicture());
    builder.pop();

    // Second sibling layer (platform view, should not be cached)
    builder.pushOpacity(127);
    builder.addPlatformView(42, width: 123.0, height: 456.0);
    builder.pop();

    // Third sibling layer (no platform view, should be cached)
    builder.pushOpacity(127);
    builder.addPicture(Offset(2.0, 1.0), CreateSimplePicture());
    builder.pop();

    signalNativeTest(); // Signal 2
    window.render(builder.build());
  };
  signalNativeTest(); // Signal 1
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void can_composite_with_opacity() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.pushOpacity(127);
    builder.addPicture(Offset(1.0, 1.0), CreateSimplePicture());
    builder.pop(); // offset
    signalNativeTest(); // Signal 2
    window.render(builder.build());
  };
  signalNativeTest(); // Signal 1
  window.scheduleFrame();
}

Picture CreateColoredBox(Color color, Size size) {
  Paint paint = Paint();
  paint.color = color;
  PictureRecorder baseRecorder = PictureRecorder();
  Canvas canvas = Canvas(baseRecorder);
  canvas.drawRect(Rect.fromLTRB(0.0, 0.0, size.width, size.height), paint);
  return baseRecorder.endRecording();
}

@pragma('vm:entry-point')
void can_composite_platform_views_with_known_scene() {
  window.onBeginFrame = (Duration duration) {
    Color red = Color.fromARGB(127, 255, 0, 0);
    Color blue = Color.fromARGB(127, 0, 0, 255);
    Color gray = Color.fromARGB(127, 127, 127, 127);

    Size size = Size(50.0, 150.0);

    SceneBuilder builder = SceneBuilder();
    builder.pushOffset(0.0, 0.0);

    // 10 (Index 0)
    builder.addPicture(Offset(10.0, 10.0), CreateColoredBox(red, size)); // red - flutter

    builder.pushOffset(20.0, 20.0);
      // 20 (Index 1)
      builder.addPlatformView(1, width: size.width, height:size.height); // green - platform
    builder.pop();

    // 30 (Index 2)
    builder.addPicture(Offset(30.0, 30.0), CreateColoredBox(blue, size)); // blue - flutter

    builder.pushOffset(40.0, 40.0);
      // 40 (Index 3)
      builder.addPlatformView(2, width: size.width, height:size.height); // magenta - platform
    builder.pop();

    // 50  (Index 4)
    builder.addPicture(Offset(50.0, 50.0), CreateColoredBox(gray, size)); // gray - flutter

    builder.pop();

    window.render(builder.build());

    signalNativeTest(); // Signal 2
  };
  signalNativeTest(); // Signal 1
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void can_composite_platform_views_with_root_layer_only() {
  window.onBeginFrame = (Duration duration) {
    Color red = Color.fromARGB(127, 255, 0, 0);
    Size size = Size(50.0, 150.0);

    SceneBuilder builder = SceneBuilder();
    builder.pushOffset(0.0, 0.0);

    // 10 (Index 0)
    builder.addPicture(Offset(10.0, 10.0), CreateColoredBox(red, size)); // red - flutter
    builder.pop();

    window.render(builder.build());

    signalNativeTest(); // Signal 2
  };
  signalNativeTest(); // Signal 1
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void can_composite_platform_views_with_platform_layer_on_bottom() {
  window.onBeginFrame = (Duration duration) {
    Color red = Color.fromARGB(127, 255, 0, 0);
    Size size = Size(50.0, 150.0);

    SceneBuilder builder = SceneBuilder();
    builder.pushOffset(0.0, 0.0);

    // 10 (Index 0)
    builder.addPicture(Offset(10.0, 10.0), CreateColoredBox(red, size)); // red - flutter

    builder.pushOffset(20.0, 20.0);
      // 20 (Index 1)
      builder.addPlatformView(1, width: size.width, height:size.height); // green - platform
    builder.pop();
    builder.pop();

    window.render(builder.build());

    signalNativeTest(); // Signal 2
  };
  signalNativeTest(); // Signal 1
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void can_render_scene_without_custom_compositor() {
  window.onBeginFrame = (Duration duration) {
    Color red = Color.fromARGB(127, 255, 0, 0);
    Color green = Color.fromARGB(127, 0, 255, 0);
    Color blue = Color.fromARGB(127, 0, 0, 255);
    Color magenta = Color.fromARGB(127, 255, 0, 255);
    Color gray = Color.fromARGB(127, 127, 127, 127);

    Size size = Size(50.0, 150.0);

    SceneBuilder builder = SceneBuilder();

    builder.pushOffset(0.0, 0.0);

    builder.addPicture(Offset(10.0, 10.0), CreateColoredBox(red, size)); // red - flutter

    builder.addPicture(Offset(20.0, 20.0), CreateColoredBox(green, size)); // green - flutter

    builder.addPicture(Offset(30.0, 30.0), CreateColoredBox(blue, size)); // blue - flutter

    builder.addPicture(Offset(40.0, 40.0), CreateColoredBox(magenta, size)); // magenta - flutter

    builder.addPicture(Offset(50.0, 50.0), CreateColoredBox(gray, size)); // gray - flutter

    builder.pop();

    window.render(builder.build());
  };
  window.scheduleFrame();
}

Picture CreateGradientBox(Size size) {
  Paint paint = Paint();
  List<Color> rainbow = [
    Color.fromARGB(255, 255, 0, 0), // red
    Color.fromARGB(255, 255, 165, 0), // orange
    Color.fromARGB(255, 255, 255, 0), // yellow
    Color.fromARGB(255, 0, 255, 0), // green
    Color.fromARGB(255, 0, 0, 255), // blue
    Color.fromARGB(255, 75, 0, 130), // indigo
    Color.fromARGB(255, 238,130,238), // violet
  ];
  List<double> stops = [
      (1.0 / 7.0),
      (2.0 / 7.0),
      (3.0 / 7.0),
      (4.0 / 7.0),
      (5.0 / 7.0),
      (6.0 / 7.0),
      (7.0 / 7.0),
  ];
  paint.shader = Gradient.linear(
    Offset(0.0, 0.0),
    Offset(size.width, size.height),
    rainbow, stops);
  PictureRecorder baseRecorder = PictureRecorder();
  Canvas canvas = Canvas(baseRecorder);
  canvas.drawRect(Rect.fromLTRB(0.0, 0.0, size.width, size.height), paint);
  return baseRecorder.endRecording();
}

@pragma('vm:entry-point')
void render_gradient() {
  window.onBeginFrame = (Duration duration) {
    Size size = Size(800.0, 600.0);

    SceneBuilder builder = SceneBuilder();

    builder.pushOffset(0.0, 0.0);

    builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(size)); // gradient - flutter

    builder.pop();

    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void render_gradient_on_non_root_backing_store() {
  window.onBeginFrame = (Duration duration) {
    Size size = Size(800.0, 600.0);
    Color red = Color.fromARGB(127, 255, 0, 0);

    SceneBuilder builder = SceneBuilder();

    builder.pushOffset(0.0, 0.0);

    // Even though this is occluded, add something so it is not elided.
    builder.addPicture(Offset(10.0, 10.0), CreateColoredBox(red, size)); // red - flutter

    builder.addPlatformView(1, width: 100, height:200); // undefined - platform

    builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(size)); // gradient - flutter

    builder.pop();

    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void verify_b141980393() {
  window.onBeginFrame = (Duration duration) {
    // The platform view in the test case is screen sized but with margins of 31
    // and 37 points from the top and bottom.
    double top_margin = 31.0;
    double bottom_margin = 37.0;
    Size platform_view_size = Size(800.0, 600.0 - top_margin - bottom_margin);

    SceneBuilder builder = SceneBuilder();

    builder.pushOffset(0.0,       // x
                       top_margin // y
      );

    // The web view in example.
    builder.addPlatformView(1337, width:  platform_view_size.width,
                                  height: platform_view_size.height);

    builder.pop();

    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void can_display_platform_view_with_pixel_ratio() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.pushTransform(Float64List.fromList([
      2.0, 0.0, 0.0, 0.0,
      0.0, 2.0, 0.0, 0.0,
      0.0, 0.0, 1.0, 0.0,
      0.0, 0.0, 0.0, 1.0
    ])); // base
    builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(Size(400.0, 300.0)));
    builder.pushOffset(0.0, 20.0); // offset
    builder.addPlatformView(42, width: 400.0, height: 280.0);
    builder.pop(); // offset
    builder.addPicture(Offset(0.0, 0.0), CreateColoredBox(Color.fromARGB(128, 255, 0, 0), Size(400.0, 300.0)));
    builder.pop(); // base
    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void can_receive_locale_updates() {
  window.onLocaleChanged = (){
    signalNativeCount(window.locales.length);
  };
  signalNativeTest();
}

// Verifies behavior tracked in https://github.com/flutter/flutter/issues/43732
@pragma('vm:entry-point')
void verify_b143464703() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.pushOffset(0.0, 0.0); // base

    // Background
    builder.addPicture(Offset(0.0, 0.0), CreateColoredBox(Color.fromARGB(255, 128, 128, 128), Size(1024.0, 600.0)));

    builder.pushOpacity(128);
    builder.addPicture(Offset(10.0, 10.0), CreateColoredBox(Color.fromARGB(255, 0, 0, 255), Size(25.0, 25.0)));
    builder.pop(); // opacity 128

    // The top bar and the platform view are pushed to the side.
    builder.pushOffset(135.0, 0.0); // 1
    builder.pushOpacity(128); // opacity

    // Platform view offset from the top
    builder.pushOffset(0.0, 60.0); // 2
    builder.addPlatformView(42, width: 1024.0, height: 540.0);
    builder.pop(); // 2

    // Top bar
    builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(Size(1024.0, 60.0)));

    builder.pop(); // opacity
    builder.pop(); // 1

    builder.pop(); // base
    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void push_frames_over_and_over() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.pushOffset(0.0, 0.0);
    builder.addPicture(Offset(0.0, 0.0), CreateColoredBox(Color.fromARGB(255, 128, 128, 128), Size(1024.0, 600.0)));
    builder.pushOpacity(128);
    builder.addPlatformView(42, width: 1024.0, height: 540.0);
    builder.pop();
    builder.pop();
    window.render(builder.build());
    signalNativeTest();
    window.scheduleFrame();
  };
  window.scheduleFrame();
}


@pragma('vm:entry-point')
void platform_view_mutators() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.pushOffset(0.0, 0.0); // base
    builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(Size(800.0, 600.0)));

    builder.pushOpacity(128);
    builder.pushClipRect(Rect.fromLTWH(10.0, 10.0, 800.0 - 20.0, 600.0 - 20.0));
    builder.pushClipRRect(RRect.fromLTRBR(10.0, 10.0, 800.0 - 10.0, 600.0 - 10.0, Radius.circular(14.0)));
    builder.addPlatformView(42, width: 800.0, height: 600.0);
    builder.pop(); // clip rrect
    builder.pop(); // clip rect
    builder.pop(); // opacity

    builder.pop(); // base
    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void platform_view_mutators_with_pixel_ratio() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.pushOffset(0.0, 0.0); // base
    builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(Size(400.0, 300.0)));

    builder.pushOpacity(128);
    builder.pushClipRect(Rect.fromLTWH(5.0, 5.0, 400.0 - 10.0, 300.0 - 10.0));
    builder.pushClipRRect(RRect.fromLTRBR(5.0, 5.0, 400.0 - 5.0, 300.0 - 5.0, Radius.circular(7.0)));
    builder.addPlatformView(42, width: 400.0, height: 300.0);
    builder.pop(); // clip rrect
    builder.pop(); // clip rect
    builder.pop(); // opacity

    builder.pop(); // base
    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void empty_scene() {
  window.onBeginFrame = (Duration duration) {
    window.render(SceneBuilder().build());
    signalNativeTest();
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void scene_with_no_container() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(Size(400.0, 300.0)));
    window.render(builder.build());
    signalNativeTest();
  };
  window.scheduleFrame();
}

Picture CreateArcEndCapsPicture() {
  PictureRecorder baseRecorder = PictureRecorder();
  Canvas canvas = Canvas(baseRecorder);

  var style = Paint()
    ..strokeWidth = 12.0
    ..style = PaintingStyle.stroke
    ..strokeCap = StrokeCap.round
    ..strokeJoin = StrokeJoin.miter;

  style.color = Color.fromARGB(255, 255, 0, 0);
  canvas.drawArc(Rect.fromLTRB(0.0, 0.0, 500.0, 500.0), 1.57, 1.0, false, style);

  return baseRecorder.endRecording();

}

@pragma('vm:entry-point')
void arc_end_caps_correct() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.addPicture(Offset(0.0, 0.0), CreateArcEndCapsPicture());
    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void scene_builder_with_clips() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.pushClipRect(Rect.fromLTRB(10.0, 10.0, 390.0, 290.0));
    builder.addPlatformView(42, width: 400.0, height: 300.0);
    builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(Size(400.0, 300.0)));
    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void scene_builder_with_complex_clips() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();

    builder.pushClipRect(Rect.fromLTRB(0.0, 0.0, 1024.0, 600.0));
    builder.pushOffset(512.0, 0.0);
    builder.pushClipRect(Rect.fromLTRB(0.0, 0.0, 512.0, 600.0));
    builder.pushOffset(-256.0, 0.0);
    builder.pushClipRect(Rect.fromLTRB(0.0, 0.0, 1024.0, 600.0));
    builder.addPlatformView(42, width: 1024.0, height: 600.0);

    builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(Size(1024.0, 600.0)));
    window.render(builder.build());
  };
  window.scheduleFrame();
}

void sendObjectToNativeCode(dynamic object) native 'SendObjectToNativeCode';

@pragma('vm:entry-point')
void objects_can_be_posted() {
  ReceivePort port = ReceivePort();
  port.listen((dynamic message){ sendObjectToNativeCode(message); });
  signalNativeCount(port.sendPort.nativePort);
}

@pragma('vm:entry-point')
void empty_scene_posts_zero_layers_to_compositor() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    // Should not render anything.
    builder.pushClipRect(Rect.fromLTRB(0.0, 0.0, 300.0, 200.0));
    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void compositor_can_post_only_platform_views() {
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.addPlatformView(42, width: 300.0, height: 200.0);
    builder.addPlatformView(24, width: 300.0, height: 200.0);
    window.render(builder.build());
  };
  window.scheduleFrame();
}

@pragma('vm:entry-point')
void render_targets_are_recycled() {
  int frame_count = 0;
  window.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    for (int i = 0; i < 10; i++) {
      builder.addPicture(Offset(0.0, 0.0), CreateGradientBox(Size(30.0, 20.0)));
      builder.addPlatformView(42 + i, width: 30.0, height: 20.0);
    }
    window.render(builder.build());
    window.scheduleFrame();
    frame_count++;
    if (frame_count == 8) {
      signalNativeTest();
    }
  };
  window.scheduleFrame();
}