1 using System; 2 using System.Windows.Forms; 3 using System.Linq; 4 using System.Text; 5 using System.Diagnostics; 6 using DX = SharpDX; 7 using D2D = SharpDX.Direct2D1; 8 using WIC = SharpDX.WIC; 9 using DDW = SharpDX.DirectWrite;10 using DXGI = SharpDX.DXGI;11 using SharpDX;12 13         public D2D.Bitmap ConvertFromSystemBitmap(System.Drawing.Bitmap bmp)14         {15             System.Drawing.Bitmap desBitmap;//预定义要是使用的bitmap16             //如果原始的图像像素格式不是32位带alpha通道17             //需要转换为32位带alpha通道的格式18             //否则无法和Direct2D的格式对应19             if (bmp.PixelFormat != System.Drawing.Imaging.PixelFormat.Format32bppPArgb)20             {21                 desBitmap = new System.Drawing.Bitmap(bmp.Width, bmp.Height, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);22                 using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(desBitmap))23                 {24                     g.DrawImage(bmp, 0, 0);25                 }26             }27             else28             {29                 desBitmap = bmp;30             }31 32 33             //直接内存copy会非常快 34             //如果使用循环逐点转换会非常慢35             System.Drawing.Imaging.BitmapData bmpData =http://www.mamicode.com/ desBitmap.LockBits(36                         new System.Drawing.Rectangle(0, 0, desBitmap.Width, desBitmap.Height),37                         System.Drawing.Imaging.ImageLockMode.ReadOnly,38                         desBitmap.PixelFormat39                     );40             int numBytes = bmpData.Stride * desBitmap.Height;41             byte[] byteData = http://www.mamicode.com/new byte[numBytes];42             IntPtr ptr = bmpData.Scan0;43             System.Runtime.InteropServices.Marshal.Copy(ptr, byteData, 0, numBytes);44             desBitmap.UnlockBits(bmpData);45 46 47 48             D2D.BitmapProperties bp;49             D2D.PixelFormat pixelFormat = new D2D.PixelFormat(DXGI.Format.B8G8R8A8_UNorm, D2D.AlphaMode.Premultiplied);50 51             bp = new D2D.BitmapProperties(52                       pixelFormat,53                       desBitmap.HorizontalResolution,54                       desBitmap.VerticalResolution55                     );56             D2D.Bitmap tempBitmap = new D2D.Bitmap(_renderTarget, new Size2(desBitmap.Width, desBitmap.Height), bp);57             tempBitmap.CopyFromMemory(byteData, bmpData.Stride);58 59             return tempBitmap;60         }