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。
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 {
100 bmpPixel.SetPixel(i, j, Color.FromArgb(128, pixel)); // alpha=255 : solid
101 }
102 }
103 }
104
105 int IntX = (imgSource.Width - bmpPixel.Width) / 2;
106 int IntY = (imgSource.Height - bmpPixel.Height) / 2;
107
108 g.InterpolationMode = InterpolationMode.HighQualityBicubic;
109 ImageFormat rawFormat = imgSource.RawFormat;
110 g.DrawImage(imgSource, 0, 0, imgSource.Width, imgSource.Height);
111 g.DrawImage(bmpPixel, IntX, IntY);
112 imgSource.Dispose();
113 bmpLogo.Dispose();
114 bmpPixel.Dispose();
115 g.Dispose();
116 bmpOutput.Save(sourceFile, rawFormat);
117 imgSource.Dispose();
118
119 }
120
121 private Bitmap resizeImage(Image imgToResize, Size size)
122 {
123 int width = imgToResize.Width;
124 int height = imgToResize.Height;
125 float num = (float)size.Width / (float)width;
126 float num2 = (float)size.Height / (float)height;
127 float num3 = (num2 < num) ? num2 : num;
128 int width2 = (int)((float)width * num3);
129 int height2 = (int)((float)height * num3);
130 Bitmap bitmap = new Bitmap(width2, height2);
131 Graphics graphics = Graphics.FromImage(bitmap);
132 graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
133 graphics.DrawImage(imgToResize, 0, 0, width2, height2);
134 graphics.Dispose();
135 return bitmap;
136 }
137
138 private Bitmap CreateNonIndexedImage(Bitmap src)
139 {
140 Bitmap bitmap = new Bitmap(src.Width, src.Height, PixelFormat.Format32bppArgb);
141 using (Graphics graphics = Graphics.FromImage(bitmap))
142 {
143 graphics.DrawImage(src, 0, 0);
144 }
145 return bitmap;
146 }
147 }
148 }