Yuebon.NetCore/Yuebon.Commons/Helpers/ImgHelper.cs

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using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Net;
using Yuebon.Commons.Log;

namespace Yuebon.Commons.Helpers
{
    /// <summary>
    /// 图片处理
    /// </summary>
    public class ImgHelper
    {        
        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="originalImagePath">源文件</param>
        /// <param name="thumbnailPath">缩略图</param>
        /// <param name="width">宽</param>
        /// <param name="height">高</param>
        /// <param name="mode"></param>
        public static void MakeThumbnail(string originalImagePath,
            string thumbnailPath,
            int width = 120, int height = 90, string mode = "H")
        {
            Image image = Image.FromFile(originalImagePath);
            if (image.Width <= width && image.Height <= height)
            {
                File.Copy(originalImagePath, thumbnailPath, true);
                image.Dispose();
            }
            else
            {
                int width2 = image.Width;
                int height2 = image.Height;
                float num = (float)height / (float)height2;
                if ((float)width / (float)width2 < num)
                {
                    num = (float)width / (float)width2;
                }
                width = (int)((float)width2 * num);
                height = (int)((float)height2 * num);
                Image image2 = new Bitmap(width, height);
                Graphics graphics = Graphics.FromImage(image2);
                graphics.Clear(Color.White);
                graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
                graphics.SmoothingMode = SmoothingMode.HighQuality;
                graphics.DrawImage(image, new Rectangle(0, 0, width, height), new Rectangle(0, 0, width2, height2), GraphicsUnit.Pixel);
                EncoderParameters encoderParameters = new EncoderParameters();
                EncoderParameter encoderParameter = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
                encoderParameters.Param[0] = encoderParameter;
                ImageCodecInfo[] imageEncoders = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo encoder = null;
                int num2 = 0;
                while (num2 < imageEncoders.Length)
                {
                    if (!imageEncoders[num2].FormatDescription.Equals("JPEG"))
                    {
                        num2++;