添加项目文件。

2025-09-29 13:48:36 +08:00
parent f61e922f0c
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+// Copyright (c) 2022-Now 少林寺驻北固山办事处大神父王喇嘛
+// 
+// SimpleAdmin 基于 Apache License Version 2.0 协议发布，可用于商业项目，但必须遵守以下补充条款:
+// 1.请不要删除和修改根目录下的LICENSE文件。
+// 2.请不要删除和修改SimpleAdmin源码头部的版权声明。
+// 3.分发源码时候，请注明软件出处 https://gitee.com/dotnetmoyu/SimpleAdmin
+// 4.基于本软件的作品，只能使用 SimpleAdmin 作为后台服务，除外情况不可商用且不允许二次分发或开源。
+// 5.请不得将本软件应用于危害国家安全、荣誉和利益的行为，不能以任何形式用于非法为目的的行为。
+// 6.任何基于本软件而产生的一切法律纠纷和责任，均于我司无关。
+
+namespace SimpleAdmin.Core.Utils;
+
+public static class ImageUtil
+{
+    /// <summary>
+    /// 图片转换成base64
+    /// </summary>
+    /// <param name="img"></param>
+    /// <returns></returns>
+    public static string ImgToBase64String(SKImage img)
+    {
+        try
+        {
+            var p = img.Encode(SKEncodedImageFormat.Png, 100);
+            var arr = p.ToArray();
+            return Convert.ToBase64String(arr);
+        }
+        catch
+        {
+            return string.Empty;
+        }
+    }
+
+    /// <summary>
+    /// 图片转换成base64
+    /// </summary>
+    /// <param name="bmp"></param>
+    /// <returns></returns>
+    public static string ImgToBase64String(this SKBitmap bmp)
+    {
+        try
+        {
+            var img = SKImage.FromBitmap(bmp);
+            var p = img.Encode(SKEncodedImageFormat.Png, 100);
+            var arr = p.ToArray();
+            return Convert.ToBase64String(arr);
+        }
+        catch
+        {
+            return string.Empty;
+        }
+    }
+
+    /// <summary>
+    /// base64转bitmap
+    /// </summary>
+    /// <param name="base64String"></param>
+    /// <returns></returns>
+    public static Bitmap GetBitmapFromBase64(this string base64String)
+    {
+        var b = Convert.FromBase64String(base64String);
+        var ms = new MemoryStream(b);
+        var bitmap = new Bitmap(ms);
+        ms.Close();
+        return bitmap;
+    }
+
+    /// <summary>
+    /// base64转bitmap
+    /// </summary>
+    /// <param name="base64String"></param>
+    /// <returns></returns>
+    public static SKBitmap GetSkBitmapFromBase64(this string base64String)
+    {
+        var b = Convert.FromBase64String(base64String);
+        var bitmap = SKBitmap.Decode(b);
+        return bitmap;
+    }
+
+    /// <summary>
+    /// base64转image格式
+    /// </summary>
+    /// <param name="base64String"></param>
+    /// <returns></returns>
+    public static string ToImageBase64(this string base64String)
+    {
+        return "data:image/png;base64," + base64String;
+    }
+
+    /// <summary>
+    /// 重新修改尺寸
+    /// </summary>
+    /// <param name="imgToResize">图片</param>
+    /// <param name="size">尺寸</param>
+    /// <returns></returns>
+    public static Bitmap ResizeImage(Image imgToResize, Size size)
+    {
+        //获取图片宽度
+        var sourceWidth = imgToResize.Width;
+        //获取图片高度
+        var sourceHeight = imgToResize.Height;
+
+        float nPercent;
+        //计算宽度的缩放比例
+        var nPercentW = size.Width / (float)sourceWidth;
+        //计算高度的缩放比例
+        var nPercentH = size.Height / (float)sourceHeight;
+
+        if (nPercentH < nPercentW)
+            nPercent = nPercentH;
+        else
+            nPercent = nPercentW;
+        //期望的宽度
+        var destWidth = (int)(sourceWidth * nPercent);
+        //期望的高度
+        var destHeight = (int)(sourceHeight * nPercent);
+
+        var b = new Bitmap(destWidth, destHeight);
+        var g = Graphics.FromImage(b);
+        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
+        //绘制图像
+        g.DrawImage(imgToResize, 0, 0, destWidth,
+            destHeight);
+        g.Dispose();
+        return b;
+    }
+
+    /// <summary>
+    /// Resize图片
+    /// </summary>
+    /// <param name="bmp">原始Bitmap </param>
+    /// <param name="newW">新的宽度</param>
+    /// <param name="newH">新的高度</param>
+    /// <returns>处理以后的图片</returns>
+    public static Bitmap ResizeImage(this Bitmap bmp, int newW, int newH)
+    {
+        try
+        {
+            var b = new Bitmap(newW, newH);
+            var g = Graphics.FromImage(b);
+            // 插值算法的质量
+            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
+            g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
+            g.Dispose();
+            return b;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// Resize图片
+    /// </summary>
+    /// <param name="bmp">原始Bitmap </param>
+    /// <param name="newW">新的宽度</param>
+    /// <param name="newH">新的高度</param>
+    /// <returns>处理以后的图片</returns>
+    public static SKBitmap ResizeImage(this SKBitmap bmp, int newW, int newH)
+    {
+        try
+        {
+            var b = new SKBitmap(newW, newH);
+            var resized = b.Resize(new SKImageInfo(newW, newH), SKFilterQuality.High);
+            if (resized is null)
+            {
+                return null;
+            }
+            var image = SKImage.FromBitmap(resized);
+            return b;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// 获取缩略图
+    /// </summary>
+    /// <param name="bmp"></param>
+    /// <param name="w">宽</param>
+    /// <param name="h">高</param>
+    /// <returns></returns>
+    public static Image GetPicThumbnail(this Bitmap bmp, int w, int h)
+    {
+        try
+        {
+            var thumbnail = bmp.GetThumbnailImage(w, h, () => false, IntPtr.Zero);
+            return thumbnail;
+        }
+        catch (Exception ex)
+        {
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// 获取缩略图
+    /// </summary>
+    /// <param name="bmp"></param>
+    /// <param name="w">宽</param>
+    /// <param name="h">高</param>
+    /// <returns></returns>
+    public static SKImage GetPicThumbnail(this SKBitmap bmp, int w, int h)
+    {
+        try
+        {
+            var resized = bmp.Resize(new SKImageInfo(w, h), SKFilterQuality.Medium);
+            if (resized is null)
+            {
+                return null;
+            }
+            var image = SKImage.FromBitmap(resized);
+            return image;
+        }
+        catch (Exception)
+        {
+            return null;
+        }
+    }
+}