using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;

namespace LSFileClient
{
	public static class ImageUtil
	{

	    public enum ImgDeep
	    {
	        D8,
	        D32
	    }
	    public static void Format(string path, string savePath, ImageFormat format, ImgDeep deep = ImgDeep.D32, int nwidth = 0, int nheight = 0)
	    {
            //string a = path + "\r\n" + savePath + "\r\n" + format + "\r\n" + deep + "\r\n" + nwidth + "\r\n" + nheight;
            //MessageBox.Show(a);

			Bitmap srcImage = null;
	        if (nwidth > 0 && nheight > 0)
	        {
	            srcImage = ReSize(path, nwidth, nheight);
	        }
	        else
	        {
	            srcImage = new Bitmap(path);
	        }

	        if (deep == ImgDeep.D8)
	        {
	            //  Bitmap b8Img = srcImage.Clone(new Rectangle(0, 0, srcImage.Width, srcImage.Height), PixelFormat.Format8bppIndexed);
	            string temp = savePath + ".temp";
	            srcImage.Format(temp, ImageFormat.Gif);//gif为8位图
	            Format(temp, savePath, format);
	            File.Delete(temp);
	            //   b8Img.Format(savePath,format);
	            return;
	        }

	        srcImage.Format(savePath, format);
	    }

        public static Bitmap ReSize(string path,int nwidth,int nheight)
	    {
            System.Drawing.Image iSource = System.Drawing.Image.FromFile(path);
	        int sW = 0, sH = 0;
	        Size temSize = new Size(iSource.Width, iSource.Height);
            if (temSize.Width > nheight || temSize.Width > nwidth) 
	        {
                if ((temSize.Width * nheight) > (temSize.Height * nwidth))
	            {
                    sW = nwidth;
                    sH = (nwidth * temSize.Height) / temSize.Width;
	            }
	            else
	            {
                    sH = nheight;
                    sW = (temSize.Width * nheight) / temSize.Height;
	            }
	        }
	        else
	        {
	            sW = temSize.Width;
	            sH = temSize.Height;
	        }

            Bitmap ob = new Bitmap(sW, sH);
	        Graphics g = Graphics.FromImage(ob);
	       // g.Clear(Color.WhiteSmoke);
	        g.CompositingQuality = CompositingQuality.HighQuality;
	        g.SmoothingMode = SmoothingMode.HighQuality;
	        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
	       // g.InterpolationMode = InterpolationMode.Default;
            g.DrawImage(iSource, new Rectangle(0, 0, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);
	        g.Dispose();

	        return ob;
	    }

        public static void Format(this Bitmap bmp, string filename, ImageFormat format)
	    {
	        EncoderParameters encoderParameters = new EncoderParameters(1);
            encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
            bmp.Save(filename, GetEncoder(format), encoderParameters);
            bmp.Dispose();
	        encoderParameters.Param[0].Dispose();
	        encoderParameters.Dispose();
	    }

        public static void Format(this Bitmap bmp, Stream stream, ImageFormat format)
	    {
	        EncoderParameters encoderParameters = new EncoderParameters(1);
	        encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
            bmp.Save(stream, GetEncoder(format), encoderParameters);
	        bmp.Dispose();
	        encoderParameters.Param[0].Dispose();
	        encoderParameters.Dispose();
	    }

        public static ImageCodecInfo GetEncoder(ImageFormat format)
	    {
	        ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();

	        foreach (ImageCodecInfo codec in codecs)
	        {
	            if (codec.FormatID == format.Guid)
	            {
	                return codec;
	            }
	        }

	        return null;
	    }



	}
}