feature: supports R16F and R32F dds image

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/ViewModels/ImageSource.cs

@@ -108,6 +108,12 @@ private static ImageSource DecodeWithPfim(Stream stream, long size)
                     case ImageFormat.Rgb8:
                         pixelFormat = PixelFormats.Gray8;
                         break;
+                    case ImageFormat.R16f:
+                        pixelFormat = PixelFormats.Gray16;
+                        break;
+                    case ImageFormat.R32f:
+                        pixelFormat = PixelFormats.Gray32Float;
+                        break;
                     case ImageFormat.R5g5b5:
                         pixelFormat = PixelFormats.Bgr555;
                         break;