cyf
126 lines
3.9 KiB
C#
126 lines
3.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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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.Windows.Forms;
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namespace LSFileClient
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{
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public static class ImageUtil
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{
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public enum ImgDeep
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{
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D8,
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D32
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}
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public static void Format(string path, string savePath, ImageFormat format, ImgDeep deep = ImgDeep.D32, int nwidth = 0, int nheight = 0)
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{
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//string a = path + "\r\n" + savePath + "\r\n" + format + "\r\n" + deep + "\r\n" + nwidth + "\r\n" + nheight;
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//MessageBox.Show(a);
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Bitmap srcImage = null;
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if (nwidth > 0 && nheight > 0)
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{
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srcImage = ReSize(path, nwidth, nheight);
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}
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else
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{
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srcImage = new Bitmap(path);
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}
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if (deep == ImgDeep.D8)
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{
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// Bitmap b8Img = srcImage.Clone(new Rectangle(0, 0, srcImage.Width, srcImage.Height), PixelFormat.Format8bppIndexed);
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string temp = savePath + ".temp";
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srcImage.Format(temp, ImageFormat.Gif);//gif为8位图
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Format(temp, savePath, format);
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File.Delete(temp);
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// b8Img.Format(savePath,format);
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return;
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}
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srcImage.Format(savePath, format);
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}
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public static Bitmap ReSize(string path,int nwidth,int nheight)
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{
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System.Drawing.Image iSource = System.Drawing.Image.FromFile(path);
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int sW = 0, sH = 0;
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Size temSize = new Size(iSource.Width, iSource.Height);
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if (temSize.Width > nheight || temSize.Width > nwidth)
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{
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if ((temSize.Width * nheight) > (temSize.Height * nwidth))
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{
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sW = nwidth;
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sH = (nwidth * temSize.Height) / temSize.Width;
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}
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else
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{
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sH = nheight;
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sW = (temSize.Width * nheight) / temSize.Height;
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}
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}
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else
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{
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sW = temSize.Width;
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sH = temSize.Height;
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}
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Bitmap ob = new Bitmap(sW, sH);
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Graphics g = Graphics.FromImage(ob);
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// g.Clear(Color.WhiteSmoke);
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g.CompositingQuality = CompositingQuality.HighQuality;
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g.SmoothingMode = SmoothingMode.HighQuality;
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g.InterpolationMode = InterpolationMode.HighQualityBicubic;
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// g.InterpolationMode = InterpolationMode.Default;
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g.DrawImage(iSource, new Rectangle(0, 0, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);
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g.Dispose();
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return ob;
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}
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public static void Format(this Bitmap bmp, string filename, ImageFormat format)
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{
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EncoderParameters encoderParameters = new EncoderParameters(1);
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encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
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bmp.Save(filename, GetEncoder(format), encoderParameters);
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bmp.Dispose();
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encoderParameters.Param[0].Dispose();
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encoderParameters.Dispose();
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}
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public static void Format(this Bitmap bmp, Stream stream, ImageFormat format)
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{
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EncoderParameters encoderParameters = new EncoderParameters(1);
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encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
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bmp.Save(stream, GetEncoder(format), encoderParameters);
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bmp.Dispose();
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encoderParameters.Param[0].Dispose();
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encoderParameters.Dispose();
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}
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public static ImageCodecInfo GetEncoder(ImageFormat format)
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{
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ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
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foreach (ImageCodecInfo codec in codecs)
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{
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if (codec.FormatID == format.Guid)
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{
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return codec;
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}
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}
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return null;
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}
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}
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}
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