问题描述
我在 WPF 中创建了这个测试程序
主窗口.xaml
<Window x:Class="TestrendertargetBitmap.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Title="MainWindow" Height="1080" Width="1920">
<Canvas x:Name="canvas">
<Rectangle x:Name="rectangle" Height="1080" Width="1920" >
<Rectangle.Fill>
<ImageBrush ImageSource="IMG_00000009.jpg"/>
</Rectangle.Fill>
</Rectangle>
</Canvas>
</Window>
MainWindow.xaml.cs
using System.Diagnostics;
using System.Threading;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace TestrendertargetBitmap
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
Stopwatch stopwatch = new Stopwatch();
rendertargetBitmap rendertargetBitmap;
public MainWindow()
{
InitializeComponent();
Timer timer = new Timer(tick,null,1000);
rendertargetBitmap = new rendertargetBitmap(1920,1080,96,PixelFormats.Pbgra32);
}
void tick(object o)
{
dispatcher.Invoke(() =>
{
stopwatch.Restart();
rendertargetBitmap.Render(rectangle);
Trace.WriteLine(stopwatch.Elapsed);
},System.Windows.Threading.dispatcherPriority.Send);
}
}
}
rendertargetBitmap 的时间不是恒定的(从 7ms 到 27ms)
00:00:00.0079500 00:00:00.0075308 00:00:00.0074662 00:00:00.0074894 00:00:00.0201755 00:00:00.0076335 00:00:00.0074838 00:00:00.0083659 00:00:00.0254968 00:00:00.0075025 00:00:00.0080511 00:00:00.0076793 00:00:00.0075073 00:00:00.0274513 00:00:00.0075937 00:00:00.0084706
我怎样才能有固定的时间?
解决方法
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