有人知道asp.net怎么给gif动画加水印吗

有人知道asp.net怎么给gif动画加水印吗
有没有代码 发来我看下

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C# code:
protected void GetImagePixels()
2 {
3 int w = image.Width;
4 int h = image.Height;
5 // int type = image.GetType().;
6 if ((w != width)
7 || (h != height)
8 )
9 {
10 // create new image with right size/format
11 Image temp =
12 new Bitmap(width, height);
13 Graphics g = Graphics.fromImage(temp);
14 g.DrawImage(image, 0, 0);
15 image = temp;
16 g.Dispose();
17 }
18 /**//*
19 ToDo:
20 improve performance: use unsafe code
21 */
22 pixels = new Byte[3 * image.Width * image.Height];
23 int count = 0;
24 Bitmap tempBitmap = new Bitmap(image);
25 int wh = image.Width;
26 int he = image.Height;
27 System.Drawing.Imaging.BitmapData bmpData = tempBitmap.LockBits(new Rectangle(0, 0, wh, he), System.Drawing.Imaging.ImageLockMode.ReadWrite, image.PixelFormat);
28 unsafe
29 {
30 byte* p = (byte*)bmpData.Scan0.ToPointer();
31
for (int i = 0; i < 4 * wh * h