85 lines
3.1 KiB
C#
85 lines
3.1 KiB
C#
using SixLabors.ImageSharp;
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Linq;
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using System.Threading.Tasks;
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namespace PictureFilesApi.Common
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{
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public class ImageHelper
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{
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private 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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{
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if (encoders[j].MimeType == mimeType)
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return encoders[j];
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}
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return null;
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}
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/// <summary>
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/// 图片压缩(降低质量以减小文件的大小)
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/// </summary>
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/// <param name="srcBitmap">传入的Bitmap对象</param>
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/// <param name="destStream">压缩后的Stream对象</param>
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/// <param name="level">压缩等级，0到100，0 最差质量，100 最佳</param>
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public static void Compress(Bitmap srcBitmap, Stream destStream, long level)
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{
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ImageCodecInfo myImageCodecInfo;
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Encoder myEncoder;
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EncoderParameter myEncoderParameter;
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EncoderParameters myEncoderParameters;
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// Get an ImageCodecInfo object that represents the JPEG codec.
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myImageCodecInfo = GetEncoderInfo("image/jpeg");
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// Create an Encoder object based on the GUID
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// for the Quality parameter category.
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myEncoder = Encoder.Quality;
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// Create an EncoderParameters object.
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// An EncoderParameters object has an array of EncoderParameter
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// objects. In this case, there is only one
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// EncoderParameter object in the array.
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myEncoderParameters = new EncoderParameters(1);
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// Save the bitmap as a JPEG file with 给定的 quality level
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myEncoderParameter = new EncoderParameter(myEncoder, level);
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myEncoderParameters.Param[0] = myEncoderParameter;
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srcBitmap.Save(destStream, myImageCodecInfo, myEncoderParameters);
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}
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/// <summary>
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/// 图片压缩(降低质量以减小文件的大小)
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/// </summary>
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/// <param name="srcBitMap">传入的Bitmap对象</param>
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/// <param name="destFile">压缩后的图片保存路径</param>
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/// <param name="level">压缩等级，0到100，0 最差质量，100 最佳</param>
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public static void Compress(Bitmap srcBitMap, string destFile, long level)
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{
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Stream s = new FileStream(destFile, FileMode.Create);
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Compress(srcBitMap, s, level);
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s.Close();
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}
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public static double ConvertDMSToDecimal(Rational[] values)
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{
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double degrees = (double)values[0].Numerator / (double)values[0].Denominator;
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double minutes = (double)values[1].Numerator / ((double)values[1].Denominator * 60);
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double seconds = (double)values[2].Numerator / ((double)values[2].Denominator * 3600);
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double result = degrees + minutes + seconds;
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return result;
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}
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}
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}
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