统一导出类结构

SpineViewer/Exporter/Implementations/ExportArgs/FrameExportArgs.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Drawing.Imaging;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpineViewer.Exporter.Implementations.ExportArgs
+{
+    /// <summary>
+    /// 单帧画面导出参数
+    /// </summary>
+    [ExportImplementation(ExportType.Frame)]
+    public class FrameExportArgs : SpineViewer.Exporter.ExportArgs
+    {
+        public FrameExportArgs(Size resolution, SFML.Graphics.View view, bool renderSelectedOnly) : base(resolution, view, renderSelectedOnly) { }
+
+        /// <summary>
+        /// 单帧画面格式
+        /// </summary>
+        [TypeConverter(typeof(ImageFormatConverter))]
+        [Category("单帧画面"), DisplayName("图像格式")]
+        public ImageFormat ImageFormat
+        {
+            get => imageFormat;
+            set
+            {
+                if (value == ImageFormat.MemoryBmp) value = ImageFormat.Bmp;
+                imageFormat = value;
+            }
+        }
+        private ImageFormat imageFormat = ImageFormat.Png;
+
+        /// <summary>
+        /// 文件名后缀
+        /// </summary>
+        [Category("单帧画面"), DisplayName("文件名后缀"), Description("与图像格式匹配的文件名后缀")]
+        public string FileSuffix { get => imageFormat.GetSuffix(); }
+
+        /// <summary>
+        /// DPI
+        /// </summary>
+        [TypeConverter(typeof(SizeFConverter))]
+        [Category("单帧画面"), DisplayName("DPI"), Description("导出图像的每英寸像素数，用于调整图像的物理尺寸")]
+        public SizeF DPI
+        {
+            get => dpi;
+            set
+            {
+                if (value.Width <= 0) value.Width = 144;
+                if (value.Height <= 0) value.Height = 144;
+                dpi = value;
+            }
+        }
+        private SizeF dpi = new(144, 144);
+    }
+}