重构图片剪裁缩放，添加转换到base64扩展方法

Former-commit-id: 678167a4f9786a924881e153ff75d90f949cb1ee

labs/CameraCard/CameraCard/CameraCard.csproj

@@ -78,6 +78,7 @@
   <ItemGroup>
     <Compile Include="CVRSDK.cs" />
     <Compile Include="Infrastructure\AForgeCameraHelper.cs" />
+    <Compile Include="Infrastructure\ImageHelper.cs" />
     <Compile Include="Infrastructure\CVRHelper.cs" />
     <Compile Include="Infrastructure\CVRSDK.cs" />
     <Compile Include="Infrastructure\ICameraHelper.cs" />

labs/CameraCard/CameraCard/Infrastructure/CVRHelper.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Drawing;
+using System.Drawing.Imaging;
 using System.Globalization;
 using System.IO;
 using System.Text;

labs/CameraCard/CameraCard/Infrastructure/ImageHelper.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Linq;
+
+public static class ImageHelper
+{
+    public static Bitmap ClipImage(this Image image, int renderWidth, int renderHeight, int rectWidth, int rectHeight)
+    {
+        var width = rectWidth * image.Width / renderWidth;
+        var height = rectHeight * width / rectWidth;
+        var bitmap = new Bitmap(width, height, PixelFormat.Format24bppRgb);
+        bitmap.SetResolution(350, 350);
+        using (var g = Graphics.FromImage(bitmap))
+        {
+            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
+            g.DrawImage(image, new Rectangle(0, 0, bitmap.Width, bitmap.Height), new Rectangle((image.Width - bitmap.Width) / 2, (image.Height - bitmap.Height) / 2, bitmap.Width, bitmap.Height), GraphicsUnit.Pixel);
+        }
+        return bitmap;
+    }
+
+    public static Bitmap ResizeImage(this Image image, int width, int height)
+    {
+        var bitmap = new Bitmap(width, height, PixelFormat.Format24bppRgb);
+        bitmap.SetResolution(350, 350);
+        using (var g = Graphics.FromImage(bitmap))
+        {
+            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
+            g.DrawImage(image, new Rectangle(0, 0, bitmap.Width, bitmap.Height), new Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel);
+        }
+        return bitmap;
+    }
+
+    public static string ToBase64(this Image image)
+    {
+        var info = ImageCodecInfo.GetImageEncoders().First(o => o.FormatID == ImageFormat.Jpeg.Guid);
+        using (var encoderParams = new EncoderParameters(1))
+        {
+            using (var param = new EncoderParameter(Encoder.Quality, 70L))
+            {
+                encoderParams.Param[0] = param;
+                //image.Save("temp.jpg", info, encoderParams);
+                using (var ms = new MemoryStream())
+                {
+                    image.Save(ms, info, encoderParams);
+                    return Convert.ToBase64String(ms.ToArray());
+                }
+            }
+        }
+    }
+}

labs/CameraCard/CameraCard/MainForm.cs

@@ -108,37 +108,15 @@ namespace CameraCard
 
         private void shotBtn_Click(object sender, EventArgs e)
         {
-            var bitmap = this.ClipImage();
-            bitmap = this.ResizeImage(bitmap);
-            this.photo.Image?.Dispose();
-            this.photo.Image = bitmap;
-        }
-
-        private Bitmap ClipImage()
-        {
-            var image = this.cameraRender.Image;
-            var width = this._rect.Width * image.Width / this.cameraRender.Width;
-            var height = this._rect.Height * width / this._rect.Width;
-            var bitmap = new Bitmap(width, height, PixelFormat.Format24bppRgb);
-            bitmap.SetResolution(350, 350);
-            using (var g = Graphics.FromImage(bitmap))
+            using (var bitmap = (this.cameraRender.Image.Clone() as Image))
             {
-                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
-                g.DrawImage(image, new Rectangle(0, 0, bitmap.Width, bitmap.Height), new Rectangle((image.Width - bitmap.Width) / 2, (image.Height - bitmap.Height) / 2, bitmap.Width, bitmap.Height), GraphicsUnit.Pixel);
-            }
-            return bitmap;
-        }
-
-        private Bitmap ResizeImage(Bitmap image)
-        {
-            var bitmap = new Bitmap(this._photoWidth, this._photoHeight, PixelFormat.Format24bppRgb);
-            bitmap.SetResolution(350, 350);
-            using (var g = Graphics.FromImage(bitmap))
-            {
-                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
-                g.DrawImage(image, new Rectangle(0, 0, bitmap.Width, bitmap.Height), new Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel);
+                using (var bitmap2 = bitmap.ClipImage(this.cameraRender.Width, this.cameraRender.Height, this._rectWidth, this._rectHeight))
+                {
+                    this.photo.Image?.Dispose();
+                    this.photo.Image = bitmap2.ResizeImage(this._photoWidth, this._photoHeight);
+                    var base64Value = $"data:image/jpeg;base64,{this.photo.Image.ToBase64()}";
+                }
             }
-            return bitmap;
         }
 
         private void UpdateIdCardUI(IdCardModel model)