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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.
// This example shows the draw operations to warm up the GPU shaders by default.
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart' show DefaultShaderWarmUp;
Future<void> beginFrame(Duration timeStamp) async {
final ui.PictureRecorder recorder = ui.PictureRecorder();
const ui.Rect paintBounds = ui.Rect.fromLTRB(0, 0, 1000, 1000);
final ui.Canvas canvas = ui.Canvas(recorder, paintBounds);
final ui.Paint backgroundPaint = ui.Paint()..color = Colors.white;
canvas.drawRect(paintBounds, backgroundPaint);
await const DefaultShaderWarmUp(
drawCallSpacing: 80.0, canvasSize: ui.Size(1024, 1024))
final ui.Picture picture = recorder.endRecording();
final ui.SceneBuilder sceneBuilder = ui.SceneBuilder()
..addPicture(, picture)
Future<void> main() async {
ui.window.onBeginFrame = beginFrame;