.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;

}