在 WPF 中创建复合位图图像

我有三个位图图像，我想将它们拼接在一起以创建合成图像。要拼接在一起的三个图像按以下方式对齐：

这些图像的类型为 System.Windows.Media.Imaging.BitmapImage。我看过以下内容solution https://stackoverflow.com/questions/14661919/merge-png-images-into-single-image-in-wpf，但它使用 System.Drawing.Graphics 来执行拼接。我发现每次我想将 BitmapImage 拼接在一起时将它们转换为 System.Drawing.Bitmap 是不直观的。

有没有一种简单的方法将 System.Windows.Media.Imaging.BitmapImage 类型的三个图像拼接在一起？

除了其他答案中描述的选项之外，下面的代码将三个 BitmapSource 拼接成一个 WriteableBitmap：

public BitmapSource StitchBitmaps(BitmapSource b1, BitmapSource b2, BitmapSource b3)
{
    if (b1.Format != b2.Format || b1.Format != b3.Format)
    {
        throw new ArgumentException("All input bitmaps must have the same pixel format");
    }

    var width = Math.Max(b1.PixelWidth, b2.PixelWidth + b3.PixelWidth);
    var height = b1.PixelHeight + Math.Max(b2.PixelHeight, b3.PixelHeight);
    var wb = new WriteableBitmap(width, height, 96, 96, b1.Format, null);
    var stride1 = (b1.PixelWidth * b1.Format.BitsPerPixel + 7) / 8;
    var stride2 = (b2.PixelWidth * b2.Format.BitsPerPixel + 7) / 8;
    var stride3 = (b3.PixelWidth * b3.Format.BitsPerPixel + 7) / 8;
    var size = b1.PixelHeight * stride1;
    size = Math.Max(size, b2.PixelHeight * stride2);
    size = Math.Max(size, b3.PixelHeight * stride3);

    var buffer = new byte[size];
    b1.CopyPixels(buffer, stride1, 0);
    wb.WritePixels(
        new Int32Rect(0, 0, b1.PixelWidth, b1.PixelHeight),
        buffer, stride1, 0);

    b2.CopyPixels(buffer, stride2, 0);
    wb.WritePixels(
        new Int32Rect(0, b1.PixelHeight, b2.PixelWidth, b2.PixelHeight),
        buffer, stride2, 0);

    b3.CopyPixels(buffer, stride3, 0);
    wb.WritePixels(
        new Int32Rect(b2.PixelWidth, b1.PixelHeight, b3.PixelWidth, b3.PixelHeight),
        buffer, stride3, 0);

    return wb;
}