將System.Windows.Media.Imaging.BitmapSource轉換爲System.Drawing.Image

Question

我將兩個庫綁定在一起。一個只給出System.Windows.Media.Imaging.BitmapSource類型的輸出，另一個只接受System.Drawing.Image類型的輸入。

如何執行此轉換？

Answer 1

private System.Drawing.Bitmap BitmapFromSource(BitmapSource bitmapsource) 
{ 
    System.Drawing.Bitmap bitmap; 
    using (MemoryStream outStream = new MemoryStream()) 
    { 
    BitmapEncoder enc = new BmpBitmapEncoder(); 
    enc.Frames.Add(BitmapFrame.Create(bitmapsource)); 
    enc.Save(outStream); 
    bitmap = new System.Drawing.Bitmap(outStream); 
    } 
    return bitmap; 
} 

Answer 2

這是一種替代技術，可以做同樣的事情。被接受的答案有效，但我遇到了具有alpha通道的圖像問題（即使切換到PngBitmapEncoder後）。這種技術也可能更快，因爲它只是在轉換爲兼容像素格式之後進行像素的原始複製。

public Bitmap BitmapFromSource(System.Windows.Media.Imaging.BitmapSource bitmapsource) 
{ 
     //convert image format 
     var src = new System.Windows.Media.Imaging.FormatConvertedBitmap(); 
     src.BeginInit(); 
     src.Source = bitmapsource; 
     src.DestinationFormat = System.Windows.Media.PixelFormats.Bgra32; 
     src.EndInit(); 

     //copy to bitmap 
     Bitmap bitmap = new Bitmap(src.PixelWidth, src.PixelHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb); 
     var data = bitmap.LockBits(new Rectangle(Point.Empty, bitmap.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb); 
     src.CopyPixels(System.Windows.Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride); 
     bitmap.UnlockBits(data); 

     return bitmap; 
}