CKFinder的水印控件的问题

由于项目需要，想在CKFinder上传图片时打上水印，于是放狗一顿狂搜，发现CKSource官方就提供这样一个插件：watermark，正宗的行货水印功能！迫不及待地下载下来安装到plugins目录中，配置config.ascx，随便选了一个logo.gif，打开项目，运行，上传图片，哦耶！搞定！漂亮的半透明水印效果就被加到了图片的右下角！

本来书说到这儿也该大圆满结局了，不过天有不测风云，项目有不测变化，BOSS来了一句“水印要放在中间” ，问题跟着来了！watermark这个插件只支持设置水印距离左、下边缘的偏移量，愣是没有设置为中间的选项！无语了，郁闷了，杯具了，浮云了........最后实在木有办法只好到CKSource的官方网站上找答案，发现官网提供的文档还算全面，于是决定自己写个插件，创新咱不会，照官网的葫芦画个瓢应该还是没问题的。折腾了半天，终于搞定了，由于时间紧迫，功能比较单一，就是在中间打个水印，只能在中间，没有选项，而且透明度是50%，都是写死的，暂且凑和用了。

代码如下，仅供参考：

  1 using System;
  2 using System.Collections.Generic;

  3 using System.Linq;

  4 using System.Text;

  5 using System.IO;

  6 using System.Drawing;

  7 using System.Drawing.Drawing2D;

  8 using System.Drawing.Imaging;

  9 using System.Web;

 10 using System.Web.UI;

 11 using CKFinder;

 12 

 13 namespace CKFinder.Plugins

 14 {

 15     public class RangeonMark : CKFinder.CKFinderPlugin

 16     {

 17         public string JavascriptPlugins

 18         {

 19             get { return ""; }

 20         }

 21 

 22         public void Init(CKFinder.Connector.CKFinderEvent CKFinderEvent)

 23         {

 24             CKFinderEvent.AfterFileUpload +=

 25                   new CKFinder.Connector.CKFinderEvent.Hook(this.RangeonMarkAfterFileUploadCommandEventHandler);

 26         }

 27 

 28         protected void RangeonMarkAfterFileUploadCommandEventHandler(object sender, CKFinder.Connector.CKFinderEventArgs e)

 29         {

 30             if (!File.Exists((string)e.data[1]))

 31             {

 32                 return;

 33             }

 34             try

 35             {

 36                 this.CreateWatermark((string)e.data[1]);

 37             }

 38             catch

 39             {

 40             }

 41         }

 42 

 43         public void CreateWatermark(string sourceFile)

 44         {

 45             MemoryStream ms = new MemoryStream();

 46             Image img = Image.FromFile(sourceFile);

 47             img.Save(ms, img.RawFormat);

 48             byte[] data = ms.GetBuffer();

 49 

 50             ms.Dispose();

 51             img.Dispose();

 52 

 53             CreateWatermark(sourceFile, data);

 54         }

 55 

 56         public void CreateWatermark(string sourceFile, byte[] imgData)

 57         {

 58             string logo = "logo.gif";

 59             string logo_file = logo;

 60             if (!File.Exists(logo_file))

 61             {

 62                 if (File.Exists(HttpContext.Current.Server.MapPath(logo_file)))

 63                 {

 64                     logo_file = HttpContext.Current.Server.MapPath(logo_file);

 65                 }

 66                 else

 67                 {

 68                     logo_file = HttpContext.Current.Server.MapPath(((Page)HttpContext.Current.Handler).ResolveUrl("~/ckfinder/plugins/rangeonmark/" + logo));

 69                     if (!File.Exists(logo_file))

 70                     {

 71                         logo_file = HttpContext.Current.Server.MapPath(((Page)HttpContext.Current.Handler).ResolveUrl("ckfinder/plugins/rangeonmark/" + logo));

 72                         if (!File.Exists(logo_file))

 73                         {

 74                             return;

 75                         }

 76                     }

 77                 }

 78             }

 79 

 80             MemoryStream ms = new MemoryStream(imgData);

 81             Image imgSource = Image.FromStream(ms);

 82             Bitmap bmpOutput = new Bitmap(imgSource.Width, imgSource.Height);

 83             Bitmap bmpLogo = new Bitmap(logo_file);

 84             Graphics g = Graphics.FromImage(bmpOutput);

 85             Bitmap bmpPixel = this.CreateNonIndexedImage(bmpLogo);

 86 

 87             if (bmpLogo.Width > imgSource.Width || bmpLogo.Height > imgSource.Height)

 88             {

 89                 bmpPixel = this.resizeImage(bmpLogo, new Size((bmpLogo.Width > imgSource.Width) ? imgSource.Width : bmpLogo.Width, (bmpLogo.Height > imgSource.Height) ? imgSource.Height : bmpLogo.Height));

 90             }

 91             Bitmap bmpResized = bmpPixel;

 92 

 93             for (int i = 0; i < bmpResized.Width; i++)

 94             {

 95                 for (int j = 0; j < bmpResized.Height; j++)

 96                 {

 97                     Color pixel = bmpResized.GetPixel(i, j);

 98                     if (pixel.A != 0)

 99                     {

                         bmpPixel.SetPixel(i, j, Color.FromArgb(128, pixel)); // alpha=255 : solid

                     }

                 }

             }

 

             int IntX = (imgSource.Width - bmpPixel.Width) / 2;

             int IntY = (imgSource.Height - bmpPixel.Height) / 2;

 

             g.InterpolationMode = InterpolationMode.HighQualityBicubic;

             ImageFormat rawFormat = imgSource.RawFormat;

             g.DrawImage(imgSource, 0, 0, imgSource.Width, imgSource.Height);

             g.DrawImage(bmpPixel, IntX, IntY);

             imgSource.Dispose();

             bmpLogo.Dispose();

             bmpPixel.Dispose();

             g.Dispose();

             bmpOutput.Save(sourceFile, rawFormat);

             imgSource.Dispose();

 

         }

 

         private Bitmap resizeImage(Image imgToResize, Size size)

         {

             int width = imgToResize.Width;

             int height = imgToResize.Height;

             float num = (float)size.Width / (float)width;

             float num2 = (float)size.Height / (float)height;

             float num3 = (num2 < num) ? num2 : num;

             int width2 = (int)((float)width * num3);

             int height2 = (int)((float)height * num3);

             Bitmap bitmap = new Bitmap(width2, height2);

             Graphics graphics = Graphics.FromImage(bitmap);

             graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;

             graphics.DrawImage(imgToResize, 0, 0, width2, height2);

             graphics.Dispose();

             return bitmap;

         }

 

         private Bitmap CreateNonIndexedImage(Bitmap src)

         {

             Bitmap bitmap = new Bitmap(src.Width, src.Height, PixelFormat.Format32bppArgb);

             using (Graphics graphics = Graphics.FromImage(bitmap))

             {

                 graphics.DrawImage(src, 0, 0);

             }

             return bitmap;

         }

     }

 }

 水平有限，代码写的比较糙，让各位牛人见笑了。