blob: 9a6a9737866e0531a37d6d2b7f8fba1273ffa4fb [file] [log] [blame]
// Copyright 2019 The Chromium 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();
final 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().warmUpOnCanvas(canvas);
final ui.Picture picture = recorder.endRecording();
final ui.SceneBuilder sceneBuilder = ui.SceneBuilder()
..addPicture(, picture)
Future<void> main() async {
ui.window.onBeginFrame = beginFrame;