500 lines
19 KiB
C#
500 lines
19 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Text;
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using ZXing;
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namespace AllBase
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{
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public class ImageCut
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{
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/// <summary>
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/// 正方型裁剪
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/// 以图片中心为轴心，截取正方型，然后等比缩放
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/// 用于头像处理
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/// </summary>
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/// <remarks>吴剑 2010-11-23</remarks>
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/// <param name="path">原图HttpPostedFile对象</param>
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/// <param name="fileSaveUrl">缩略图存放地址</param>
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/// <param name="side">指定的边长（正方型）</param>
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/// <param name="quality">质量（范围0-100）</param>
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public static void CutForSquare(string path, string fileSaveUrl, int side, int quality, out int width,
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out int height)
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{
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string exe = path.Split('.')[path.Split('.').Length - 1].ToLower();
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Image initImage = null;
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width = 0;
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height = 0;
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try
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{
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FileStream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
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initImage = Image.FromStream(fileStream);
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fileStream.Close();
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fileStream.Dispose();
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}
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catch (Exception e)
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{
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LogSave.Add(e.Message);
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return;
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}
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width = initImage.Width;
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height = initImage.Height;
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//原图宽高均小于模版，不作处理，直接保存
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if (initImage.Width <= side || initImage.Height <= side)
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{
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return;
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//initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
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}
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//关键质量控制
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//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
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ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();
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ImageCodecInfo ici = null, defCodecInfo = null;
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foreach (ImageCodecInfo i in icis)
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{
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if (i.MimeType == "image/jpeg")
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defCodecInfo = i;
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if ((exe == "jpg" || exe == "jpeg") && i.MimeType == "image/jpeg")
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{
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ici = i;
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}
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if (exe == "bmp" && i.MimeType == "image/bmp")
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{
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ici = i;
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}
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if (exe == "png" && i.MimeType == "image/png")
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{
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ici = i;
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}
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if (exe == "gif" && i.MimeType == "image/gif")
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{
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ici = i;
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}
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}
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if (ici == null)
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ici = defCodecInfo;
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EncoderParameters ep = new EncoderParameters(1);
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ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);
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//原始图片的宽、高
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int initWidth = initImage.Width;
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int initHeight = initImage.Height;
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int sizeW = 50, sizeH = 50;
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if (initWidth > initHeight)
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sizeW = 70;
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else
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sizeH = 70;
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width = initWidth - sizeW * 2;
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height = initHeight - sizeH * 2;
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//FileBase.Delete(path);
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Image pickedImage = new Bitmap(width, height);
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Graphics pickedG = Graphics.FromImage(pickedImage);
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pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Low;
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pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
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//定位
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Rectangle fromR = new Rectangle(sizeW - 20, sizeH, width, height);
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Rectangle toR = new Rectangle(0, 0, width, height);
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//画图
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pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
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//将截图对象赋给原图
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Image initImagex = (System.Drawing.Image)pickedImage.Clone();
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//释放截图资源
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pickedG.Dispose();
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pickedImage.Dispose();
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initImage.Clone();
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initImage.Dispose();
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try
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{
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initImagex.Save(fileSaveUrl, ici, ep);
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}
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catch (Exception e)
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{
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LogSave.Add(e.Message);
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}
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//释放关键质量控制所用资源
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ep.Dispose();
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}
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/// <summary>
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/// 是否二维码
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/// </summary>
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/// <param name="strSavePath"></param>
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/// <returns></returns>
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public static bool GetErWeiMa(string strSavePath)
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{
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BarcodeReader reader = new BarcodeReader();
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FileStream fileStream = new FileStream(strSavePath, FileMode.Open, FileAccess.Read);
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try
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{
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Image initImage = Image.FromStream(fileStream);
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fileStream.Close();
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fileStream.Dispose();
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if (initImage.Width < 10 || initImage.Height < 10)
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return false;
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Result result = reader.Decode((Bitmap)initImage);
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if (result == null || string.IsNullOrEmpty(result.Text))
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return false;
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}
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catch
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{
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return false;
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}
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FileBase.Delete(strSavePath);
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return true;
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//return result.Text;
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}
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/// <summary>
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/// 是否二维码
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/// </summary>
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/// <param name="strSavePath"></param>
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/// <returns></returns>
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public static bool GetErWeiMa(byte[] file, out int width, out int height)
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{
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width = 0;
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height = 0;
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try
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{
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MemoryStream ms = new MemoryStream(file);
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Image initImage = Image.FromStream(ms);
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ms.Close();
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width = initImage.Width;
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height = initImage.Height;
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if (initImage.Width < 10 || initImage.Height < 10)
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{
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initImage = null;
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return false;
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}
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BarcodeReader reader = new BarcodeReader();
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Result result = reader.Decode((Bitmap)initImage);
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if (result == null || string.IsNullOrEmpty(result.Text))
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{
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reader = null;
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result = null;
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initImage = null;
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return false;
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}
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reader = null;
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result = null;
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initImage = null;
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}
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catch
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{
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return false;
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}
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return true;
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//return result.Text;
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}
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/// <summary>
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/// 正方型裁剪
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/// 以图片中心为轴心，截取正方型，然后等比缩放
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/// 用于头像处理
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/// </summary>
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/// <remarks>吴剑 2010-11-23</remarks>
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/// <param name="postedFile">原图HttpPostedFile对象</param>
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/// <param name="fileSaveUrl">缩略图存放地址</param>
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/// <param name="side">指定的边长（正方型）</param>
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/// <param name="quality">质量（范围0-100）</param>
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public static void CutForSquare(System.IO.Stream fromFile, string fileSaveUrl, int side, int quality)
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{
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//创建目录
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string dir = Path.GetDirectoryName(fileSaveUrl);
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if (!Directory.Exists(dir))
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Directory.CreateDirectory(dir);
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//原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）
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System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);
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//原图宽高均小于模版，不作处理，直接保存
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if (initImage.Width <= side && initImage.Height <= side)
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{
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initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
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}
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else
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{
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//原始图片的宽、高
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int initWidth = initImage.Width;
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int initHeight = initImage.Height;
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//非正方型先裁剪为正方型
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if (initWidth != initHeight)
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{
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//截图对象
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System.Drawing.Image pickedImage = null;
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System.Drawing.Graphics pickedG = null;
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//宽大于高的横图
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if (initWidth > initHeight)
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{
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//对象实例化
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pickedImage = new System.Drawing.Bitmap(initHeight, initHeight);
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pickedG = System.Drawing.Graphics.FromImage(pickedImage);
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//设置质量
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pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//定位
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Rectangle fromR = new Rectangle((initWidth - initHeight) / 2, 0, initHeight, initHeight);
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Rectangle toR = new Rectangle(0, 0, initHeight, initHeight);
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//画图
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pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
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//重置宽
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initWidth = initHeight;
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}
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//高大于宽的竖图
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else
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{
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//对象实例化
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pickedImage = new System.Drawing.Bitmap(initWidth, initWidth);
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pickedG = System.Drawing.Graphics.FromImage(pickedImage);
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//设置质量
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pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//定位
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Rectangle fromR = new Rectangle(0, (initHeight - initWidth) / 2, initWidth, initWidth);
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Rectangle toR = new Rectangle(0, 0, initWidth, initWidth);
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//画图
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pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
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//重置高
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initHeight = initWidth;
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}
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//将截图对象赋给原图
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initImage = (System.Drawing.Image)pickedImage.Clone();
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//释放截图资源
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pickedG.Dispose();
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pickedImage.Dispose();
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}
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//缩略图对象
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System.Drawing.Image resultImage = new System.Drawing.Bitmap(side, side);
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System.Drawing.Graphics resultG = System.Drawing.Graphics.FromImage(resultImage);
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//设置质量
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resultG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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resultG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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//用指定背景色清空画布
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resultG.Clear(Color.White);
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//绘制缩略图
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resultG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, side, side), new System.Drawing.Rectangle(0, 0, initWidth, initHeight), System.Drawing.GraphicsUnit.Pixel);
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//关键质量控制
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//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
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ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();
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ImageCodecInfo ici = null;
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foreach (ImageCodecInfo i in icis)
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{
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if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif")
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{
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ici = i;
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}
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}
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EncoderParameters ep = new EncoderParameters(1);
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ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);
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//保存缩略图
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resultImage.Save(fileSaveUrl, ici, ep);
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//释放关键质量控制所用资源
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ep.Dispose();
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//释放缩略图资源
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resultG.Dispose();
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resultImage.Dispose();
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//释放原始图片资源
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initImage.Dispose();
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}
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}
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/// <summary>
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/// 判断文件类型是否为WEB格式图片
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/// (注：JPG,GIF,BMP,PNG)
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/// </summary>
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/// <param name="contentType">HttpPostedFile.ContentType</param>
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/// <returns></returns>
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public static bool IsWebImage(string contentType)
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{
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if (contentType == "image/pjpeg" || contentType == "image/jpeg" || contentType == "image/gif" || contentType == "image/bmp" || contentType == "image/png")
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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/// <summary>
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/// 压缩图片获得图片MD5 32位指纹
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/// </summary>
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/// <param name="imgToResize"></param>
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/// <param name="width"></param>
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/// <param name="height"></param>
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/// <returns></returns>
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public static long ResizeImage(Image imgToResize, int width, int height)
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{
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try
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{
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int sourceWidth = imgToResize.Width;
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int sourceHeight = imgToResize.Height;
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float nPercent = 0;
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float nPercentW = 0;
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float nPercentH = 0;
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nPercentW = ((float)width / (float)sourceWidth);
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nPercentH = ((float)height / (float)sourceHeight);
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if (nPercentH < nPercentW)
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nPercent = nPercentH;
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else
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nPercent = nPercentW;
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int destWidth = (int)(sourceWidth * nPercent);
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int destHeight = (int)(sourceHeight * nPercent);
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Bitmap b = new Bitmap(destWidth, destHeight);
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Graphics g = Graphics.FromImage(b);
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g.InterpolationMode = InterpolationMode.HighQualityBicubic;
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g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
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g.Dispose();
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imgToResize.Dispose();
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long md5 = ToGray(ref b, width, height);
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return md5;
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}
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catch (Exception e)
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{
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LogSave.Add("计算图片指纹失败："+e.Message);
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return 0;
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}
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}
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/// <summary>
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/// 图像灰度化，并计算指纹
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/// </summary>
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/// <param name="bmp"></param>
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/// <returns></returns>
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public static long ToGray(ref Bitmap bmp, int width, int height)
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{
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byte[] b = new byte[width * height];
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for (int i = 0; i < bmp.Width; i++)
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{
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for (int j = 0; j < bmp.Height; j++)
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{
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Color color = bmp.GetPixel(i, j);
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int gray = (int)(color.R * 0.3 + color.G * 0.59 + color.B * 0.11);
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gray = gray / 16;
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b[i * bmp.Width + j] = (byte)gray;
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}
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}
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return BaseClass.GetLong(b);
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}
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/// <summary>
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/// 处理图片(四边裁剪+水印)
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/// </summary>
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/// <param name="bytesOld"></param>
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/// <param name="sWaterMark"></param>
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/// <returns></returns>
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public static void HandleImage(ref byte[] bytesOld,bool flag)
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{
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try
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{
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Image img = BytesToImage(ref bytesOld);
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int iniWidth = img.Width;
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int iniHeight = img.Height;
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Random random = new Random();
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int cutPixl = random.Next(1, 50); //左边切除的像素
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int cutPixr = random.Next(1, 50); //右边切除的像素
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int cutPixt = random.Next(1, 50); //顶部切除的像素
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int cutPixb = random.Next(1, 50); //底部切除的像素
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if (!flag)
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{
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cutPixl = 0; //左边切除的像素
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cutPixr = 0; //右边切除的像素
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cutPixt = 0; //顶部切除的像素
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cutPixb = 0; //底部切除的像素
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}
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Bitmap bitmap = CutImage(ref bytesOld, cutPixl, cutPixr, iniWidth - cutPixl - cutPixt, iniHeight - cutPixr - cutPixb);
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if(bitmap==null)
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return;
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MemoryStream ms = new MemoryStream();
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ImageCodecInfo icc = GetEncoderInfo("image/jpeg");
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EncoderParameters ep = new EncoderParameters(1)
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{
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Param = { [0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 75l) }
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};
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bitmap.Save(ms, icc, ep);
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bytesOld = ms.ToArray();
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}
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catch
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{
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}
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}
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/// <summary>
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/// 字节数组转换为图片
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/// </summary>
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/// <param name="buffer">字节数组</param>
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/// <returns>图片</returns>
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public static Image BytesToImage(ref byte[] buffer)
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{
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var ms = new MemoryStream(buffer, 0, buffer.Length);
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return Image.FromStream(ms);
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}
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/// <summary>
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/// 裁剪图片四边
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/// </summary>
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/// <param name="bytes">原始图片字节流</param>
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/// <param name="iStartX">裁剪开始x坐标</param>
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/// <param name="iStartY">裁剪开始y坐标</param>
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/// <param name="iWidth">裁剪宽度</param>
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/// <param name="iHeight">裁剪高度</param>
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/// <returns></returns>
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public static Bitmap CutImage(ref byte[] bytes, int iStartX, int iStartY, int iWidth, int iHeight)
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{
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try
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{
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Image image = BytesToImage(ref bytes);
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Bitmap b = new Bitmap(image);
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if (bytes == null) return null;
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Bitmap bmpOut = new Bitmap(iWidth, iHeight, PixelFormat.Format24bppRgb);
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Graphics g = Graphics.FromImage(bmpOut);
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g.DrawImage(b, new Rectangle(0, 0, iWidth, iHeight), new Rectangle(iStartX, iStartY, iWidth, iHeight), GraphicsUnit.Pixel);
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g.Dispose();
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return bmpOut;
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}
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catch
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{
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return null;
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}
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}
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public static ImageCodecInfo GetEncoderInfo(string mimeType)
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{
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int j;
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ImageCodecInfo[] encoders;
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encoders = ImageCodecInfo.GetImageEncoders();
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for (j = 0; j < encoders.Length; ++j)
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{
|
||
if (encoders[j].MimeType == mimeType)
|
||
return encoders[j];
|
||
}
|
||
return null;
|
||
}
|
||
}
|
||
}
|