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  • WatermarkMaker

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Drawing.Imaging;
    using System.Drawing;
    using System.IO;
    
    namespace TestUploadImage.FinalUse
    {
        public class WatermarkMaker
        {
            /// <summary>
            /// 图片水印
            /// </summary>
            /// <param name="imgPath">服务器图片相对路径</param>
            /// <param name="filename">保存文件名</param>
            /// <param name="watermarkFilename">水印文件相对路径</param>
            /// <param name="watermarkStatus">图片水印位置 0=不使用 1=左上 2=中上 3=右上 4=左中  9=右下</param>
            /// <param name="quality">附加水印图片质量,0-100</param>
            /// <param name="watermarkTransparency">水印的透明度 1--10 10为不透明</param>
            public static void AddImageSignPic(string imgPath, string filename, string watermarkFilename, int watermarkStatus, int quality, int watermarkTransparency)
            {
                if (!File.Exists(GetMapPath(imgPath)))
                    return;
                byte[] _ImageBytes = File.ReadAllBytes(GetMapPath(imgPath));
                Image img = Image.FromStream(new System.IO.MemoryStream(_ImageBytes));
                filename = GetMapPath(filename);
    
                if (watermarkFilename.StartsWith("/") == false)
                    watermarkFilename = "/" + watermarkFilename;
                watermarkFilename = GetMapPath(watermarkFilename);
                if (!File.Exists(watermarkFilename))
                    return;
                Graphics g = Graphics.FromImage(img);
                //设置高质量插值法
                //g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
                //设置高质量,低速度呈现平滑程度
                //g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                Image watermark = new Bitmap(watermarkFilename);
    
                if (watermark.Height >= img.Height || watermark.Width >= img.Width)
                    return;
    
                ImageAttributes imageAttributes = new ImageAttributes();
                ColorMap colorMap = new ColorMap();
    
                colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
                colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
                ColorMap[] remapTable = { colorMap };
    
                imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
    
                float transparency = 0.5F;
                if (watermarkTransparency >= 1 && watermarkTransparency <= 10)
                    transparency = (watermarkTransparency / 10.0F);
    
    
                float[][] colorMatrixElements = {
                                                    new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},
                                                    new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},
                                                    new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},
                                                    new float[] {0.0f,  0.0f,  0.0f,  transparency, 0.0f},
                                                    new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}
                                                };
    
                ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
    
                imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
    
                int xpos = 0;
                int ypos = 0;
    
                switch (watermarkStatus)
                {//0 = 不使用 1 = 左上 2 = 中上 3 = 右上 4 = 左中  9 = 右下
                    case 1:
                        xpos = (int)(img.Width * (float).01);
                        ypos = (int)(img.Height * (float).01);
                        break;
                    case 2:
                        xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));
                        ypos = (int)(img.Height * (float).01);
                        break;
                    case 3:
                        xpos = (int)((img.Width * (float).99) - (watermark.Width));
                        ypos = (int)(img.Height * (float).01);
                        break;
                    case 4:
                        xpos = (int)(img.Width * (float).01);
                        ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));
                        break;
                    case 5:
                        xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));
                        ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));
                        break;
                    case 6:
                        xpos = (int)((img.Width * (float).99) - (watermark.Width));
                        ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));
                        break;
                    case 7:
                        xpos = (int)(img.Width * (float).01);
                        ypos = (int)((img.Height * (float).99) - watermark.Height);
                        break;
                    case 8:
                        xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));
                        ypos = (int)((img.Height * (float).99) - watermark.Height);
                        break;
                    case 9:
                        xpos = (int)((img.Width * (float).99) - (watermark.Width));
                        ypos = (int)((img.Height * (float).99) - watermark.Height);
                        break;
                }
    
                g.DrawImage(watermark, new Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
    
                ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo ici = null;
                foreach (ImageCodecInfo codec in codecs)
                {
                    if (codec.MimeType.IndexOf("jpeg") > -1)
                        ici = codec;
                }
                EncoderParameters encoderParams = new EncoderParameters();
                long[] qualityParam = new long[1];
                if (quality < 0 || quality > 100)
                    quality = 80;
    
                qualityParam[0] = quality;
    
                EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
                encoderParams.Param[0] = encoderParam;
    
                if (ici != null)
                    img.Save(filename, ici, encoderParams);
                else
                    img.Save(filename);
    
                g.Dispose();
                img.Dispose();
                watermark.Dispose();
                imageAttributes.Dispose();
            }
    
            /// <summary>
            /// 文字水印
            /// </summary>
            /// <param name="imgPath">服务器图片相对路径</param>
            /// <param name="filename">保存文件名</param>
            /// <param name="watermarkText">水印文字</param>
            /// <param name="watermarkStatus">图片水印位置 0=不使用 1=左上 2=中上 3=右上 4=左中  9=右下</param>
            /// <param name="quality">附加水印图片质量,0-100</param>
            /// <param name="fontname">字体</param>
            /// <param name="fontsize">字体大小</param>
            public static void AddImageSignText(string imgPath, string filename, string watermarkText, int watermarkStatus, int quality, string fontname, int fontsize)
            {
                byte[] _ImageBytes = File.ReadAllBytes(GetMapPath(imgPath));
                Image img = Image.FromStream(new System.IO.MemoryStream(_ImageBytes));
                filename = GetMapPath(filename);
    
                Graphics g = Graphics.FromImage(img);
                Font drawFont = new Font(fontname, fontsize, FontStyle.Regular, GraphicsUnit.Pixel);
                SizeF crSize;
                crSize = g.MeasureString(watermarkText, drawFont);
    
                float xpos = 0;
                float ypos = 0;
    
                switch (watermarkStatus)
                {
                    case 1:
                        xpos = (float)img.Width * (float).01;
                        ypos = (float)img.Height * (float).01;
                        break;
                    case 2:
                        xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
                        ypos = (float)img.Height * (float).01;
                        break;
                    case 3:
                        xpos = ((float)img.Width * (float).99) - crSize.Width;
                        ypos = (float)img.Height * (float).01;
                        break;
                    case 4:
                        xpos = (float)img.Width * (float).01;
                        ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
                        break;
                    case 5:
                        xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
                        ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
                        break;
                    case 6:
                        xpos = ((float)img.Width * (float).99) - crSize.Width;
                        ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
                        break;
                    case 7:
                        xpos = (float)img.Width * (float).01;
                        ypos = ((float)img.Height * (float).99) - crSize.Height;
                        break;
                    case 8:
                        xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
                        ypos = ((float)img.Height * (float).99) - crSize.Height;
                        break;
                    case 9:
                        xpos = ((float)img.Width * (float).99) - crSize.Width;
                        ypos = ((float)img.Height * (float).99) - crSize.Height;
                        break;
                }
    
                g.DrawString(watermarkText, drawFont, new SolidBrush(Color.White), xpos + 1, ypos + 1);
                g.DrawString(watermarkText, drawFont, new SolidBrush(Color.Black), xpos, ypos);
    
                ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo ici = null;
                foreach (ImageCodecInfo codec in codecs)
                {
                    if (codec.MimeType.IndexOf("jpeg") > -1)
                        ici = codec;
                }
                EncoderParameters encoderParams = new EncoderParameters();
                long[] qualityParam = new long[1];
                if (quality < 0 || quality > 100)
                    quality = 80;
    
                qualityParam[0] = quality;
    
                EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
                encoderParams.Param[0] = encoderParam;
    
                if (ici != null)
                    img.Save(filename, ici, encoderParams);
                else
                    img.Save(filename);
    
                g.Dispose();
                img.Dispose();
            }
            #region 获得当前绝对路径
            /// <summary>
            /// 获得当前绝对路径
            /// </summary>
            /// <param name="strPath">指定的路径</param>
            /// <returns>绝对路径</returns>
            public static string GetMapPath(string strPath)
            {
                if (strPath.ToLower().StartsWith("http://"))
                {
                    return strPath;
                }
                if (HttpContext.Current != null)
                {
                    string path = System.Web.HttpContext.Current.Server.MapPath("/") + strPath;
                    return path;
                }
                else //非web程序引用
                {
                    strPath = strPath.Replace("/", "\");
                    if (strPath.StartsWith("\"))
                    {
                        strPath = strPath.Substring(strPath.IndexOf('\', 1)).TrimStart('\');
                    }
                    return System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, strPath);
                }
            }
            #endregion
        }
    }
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  • 原文地址:https://www.cnblogs.com/CoderWayne/p/9969494.html
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