using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Drawing.Imaging;
using System.Drawing;

public partial class Default2 : System.Web.UI.Page
{
    public void ImgReduceCutOut(int int_Width, int int_Height, string input_ImgUrl, string out_ImgUrl)
    {
        // ＝＝＝上传标准图大小＝＝＝
        int int_Standard_Width = 160;
        int int_Standard_Height = 160;

        int Reduce_Width = 0; // 缩小的宽度
        int Reduce_Height = 0; // 缩小的高度
        int CutOut_Width = 0; // 裁剪的宽度
        int CutOut_Height = 0; // 裁剪的高度
        int level = 100; //缩略图的质量 1-100的范围

        // ＝＝＝获得缩小，裁剪大小＝＝＝
        if (int_Standard_Height * int_Width / int_Standard_Width > int_Height)
        {
            Reduce_Width = int_Width;
            Reduce_Height = int_Standard_Height * int_Width / int_Standard_Width;
            CutOut_Width = int_Width;
            CutOut_Height = int_Height;
        }
        else if (int_Standard_Height * int_Width / int_Standard_Width < int_Height)
        {
            Reduce_Width = int_Standard_Width * int_Height / int_Standard_Height;
            Reduce_Height = int_Height;
            CutOut_Width = int_Width;
            CutOut_Height = int_Height;
        }
        else
        {
            Reduce_Width = int_Width;
            Reduce_Height = int_Height;
            CutOut_Width = int_Width;
            CutOut_Height = int_Height;
        }

        // ＝＝＝通过连接创建Image对象＝＝＝
        System.Drawing.Image oldimage = System.Drawing.Image.FromFile(Server.MapPath(input_ImgUrl));

        //// ＝＝＝缩小图片＝＝＝
        //System.Drawing.Image thumbnailImage = oldimage.GetThumbnailImage(Reduce_Width, Reduce_Height, new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);
        //Bitmap bm = new Bitmap(thumbnailImage);
        Bitmap bm = new Bitmap(oldimage);
        // ＝＝＝处理JPG质量的函数＝＝＝
        ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
        ImageCodecInfo ici = null;
        foreach (ImageCodecInfo codec in codecs)
        {
            if (codec.MimeType == "image/jpeg")
                ici = codec;
        }
        EncoderParameters ep = new EncoderParameters();
        ep.Param[0] = new EncoderParameter(Encoder.Quality, (long)level);

        bm.Save(Server.MapPath("2.jpg"), ici, ep);

        // ＝＝＝裁剪图片＝＝＝
        Rectangle cloneRect = new Rectangle(70, 0, CutOut_Width, CutOut_Height);
        PixelFormat format = bm.PixelFormat;
        Bitmap cloneBitmap = bm.Clone(cloneRect, format);

        // ＝＝＝保存图片＝＝＝
        cloneBitmap.Save(Server.MapPath(out_ImgUrl), ici, ep);
    }
    public bool ThumbnailCallback()
    {
        return false;
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
           // ImgReduceCutOut(397, 319, "face.jpg", "2.jpg");

        }
    }
}