快速将位图转换为位图源 wpf [英] fast converting Bitmap to BitmapSource wpf

问题描述

我需要在 Image 组件上以 30Hz 的频率绘制图像.我使用此代码:

I need to draw an image on the Image component at 30Hz. I use this code :

public MainWindow()
    {
        InitializeComponent();

        Messenger.Default.Register<Bitmap>(this, (bmp) =>
        {
            ImageTarget.Dispatcher.BeginInvoke((Action)(() =>
            {
                var hBitmap = bmp.GetHbitmap();
                var drawable = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                  hBitmap,
                  IntPtr.Zero,
                  Int32Rect.Empty,
                  BitmapSizeOptions.FromEmptyOptions());
                DeleteObject(hBitmap);
                ImageTarget.Source = drawable;
            }));
        });
    }

问题是，使用这段代码，我的 CPU 使用率大约为 80%，如果没有转换，它大约为 6%.

The problem is, with this code, My CPU usage is about 80%, and, without the convertion it's about 6%.

那么为什么转换位图这么长?
有没有更快的方法(使用不安全代码)?

So why converting bitmap is so long ?
Are there faster method (with unsafe code) ?

推荐答案

这里有一种方法(根据我的经验)至少比 CreateBitmapSourceFromHBitmap 快四倍.

Here is a method that (to my experience) is at least four times faster than CreateBitmapSourceFromHBitmap.

它要求您为结果 BitmapSource 设置正确的 PixelFormat.

It requires that you set the correct PixelFormat of the resulting BitmapSource.

public static BitmapSource Convert(System.Drawing.Bitmap bitmap)
{
    var bitmapData = bitmap.LockBits(
        new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height),
        System.Drawing.Imaging.ImageLockMode.ReadOnly, bitmap.PixelFormat);

    var bitmapSource = BitmapSource.Create(
        bitmapData.Width, bitmapData.Height,
        bitmap.HorizontalResolution, bitmap.VerticalResolution,
        PixelFormats.Bgr24, null,
        bitmapData.Scan0, bitmapData.Stride * bitmapData.Height, bitmapData.Stride);

    bitmap.UnlockBits(bitmapData);

    return bitmapSource;
}

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