.net c# gif动画如何添加图片水印实现思路及代码

public static Bitmap WaterMarkWithText(System.Drawing.Bitmap origialGif, string text,string filePath) { //用于存放桢 List<Frame> frames = new List<Frame>(); //如果不是gif文件,直接返回原图像 if (origialGif.RawFormat.Guid != System.Drawing.Imaging.ImageFormat.Gif.Guid) { return origialGif; } //如果该图像是gif文件 foreach (Guid guid in origialGif.FrameDimensionsList) { System.Drawing.Imaging.FrameDimension frameDimension = new System.Drawing.Imaging.FrameDimension(guid); int frameCount = origialGif.GetFrameCount(frameDimension); for (int i = 0; i < frameCount; i++) { if (origialGif.SelectActiveFrame(frameDimension, i) == 0) { int delay = Convert.ToInt32(origialGif.GetPropertyItem(20736).Value.GetValue(i)); Image img = Image.FromHbitmap(origialGif.GetHbitmap()); Font font = new Font(new FontFamily("宋体"), 35.0f,FontStyle.Bold); Graphics g = Graphics.FromImage(img); g.DrawString(text, font, Brushes.BlanchedAlmond, new PointF(10.0f, 10.0f)); Frame frame = new Frame(img, delay); frames.Add(frame); } } Gif.Components.AnimatedGifEncoder gif = new Gif.Components.AnimatedGifEncoder(); gif.Start(filePath); gif.SetDelay(100); gif.SetRepeat(0); for (int i = 0; i < frames.Count; i++) { gif.AddFrame(frames[i].Image); } gif.Finish(); try { Bitmap gifImg = (Bitmap)Bitmap.FromFile(filePath); return gifImg; } catch { return origialGif; } } return origialGif; }