Separate code

Delete some useless code

AssetStudio/StudioClasses/Exporter.cs

@@ -13,7 +13,7 @@ namespace AssetStudio
     {
         public static bool ExportTexture2D(AssetPreloadData asset, string exportPathName, bool flip)
         {
-            var m_Texture2D = new Texture2D(asset, true);
+            var m_Texture2D = new Texture2DConverter(new Texture2D(asset, true));
             if (m_Texture2D.image_data == null)
                 return false;
             var convert = (bool)Properties.Settings.Default["convertTexture"];
@@ -41,15 +41,14 @@ namespace AssetStudio
                 bitmap.Dispose();
                 return true;
             }
-            if (!convert)
+            else
             {
-                var exportFullName = exportPathName + asset.Text + asset.extension;
+                var exportFullName = exportPathName + asset.Text + m_Texture2D.GetExtensionName();
                 if (ExportFileExists(exportFullName))
                     return false;
                 File.WriteAllBytes(exportFullName, m_Texture2D.ConvertToContainer());
                 return true;
             }
-            return false;
         }
 
         public static bool ExportAudioClip(AssetPreloadData asset, string exportPath)

AssetStudio/StudioClasses/ModelConverter.cs

@@ -568,7 +568,7 @@ namespace AssetStudio
 
             using (var memStream = new MemoryStream())
             {
-                var bitmap = tex2D.ConvertToBitmap(true);
+                var bitmap = new Texture2DConverter(tex2D).ConvertToBitmap(true);
                 if (bitmap != null)
                 {
                     bitmap.Save(memStream, ImageFormat.Png);

AssetStudio/StudioClasses/SpriteHelper.cs

@@ -40,7 +40,7 @@ namespace AssetStudio
 
         private static Bitmap CutImage(AssetPreloadData asset, AssetPreloadData texture2DAsset, RectangleF textureRect)
         {
-            var texture2D = new Texture2D(texture2DAsset, true);
+            var texture2D = new Texture2DConverter(new Texture2D(texture2DAsset, true));
             using (var originalImage = texture2D.ConvertToBitmap(false))
             {
                 if (originalImage != null)
@@ -61,7 +61,7 @@ namespace AssetStudio
 
         private static Bitmap CutImage(AssetPreloadData asset, AssetPreloadData texture2DAsset, RectangleF textureRect, Sprite sprite)
         {
-            var texture2D = new Texture2D(texture2DAsset, true);
+            var texture2D = new Texture2DConverter(new Texture2D(texture2DAsset, true));
             using (var originalImage = texture2D.ConvertToBitmap(false))
             {
                 if (originalImage != null)