impl. image-as-is option

Jpeg.cs

@@ -1,4 +1,5 @@
 using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Formats;
 using SixLabors.ImageSharp.Formats.Jpeg;
 using SixLabors.ImageSharp.PixelFormats;
 namespace RagePhoto.Cli;
@@ -6,7 +7,11 @@ namespace RagePhoto.Cli;
 internal class Jpeg {
 
     internal static Byte[] GetEmptyJpeg(PhotoFormat format, out Size size) {
-        size = format == PhotoFormat.GTA5 ? new(960, 536) : new(1920, 1080);
+        size = format switch {
+            PhotoFormat.GTA5 => new(960, 536),
+            PhotoFormat.RDR2 => new(1920, 1080),
+            _ => throw new ArgumentException("Invalid Format", nameof(format))
+        };
         using Image<Rgb24> image = new(size.Width, size.Height);
         image.ProcessPixelRows(static pixelAccessor => {
             for (Int32 y = 0; y < pixelAccessor.Height; y++) {
@@ -16,27 +21,43 @@ internal class Jpeg {
                 }
             }
         });
-        using MemoryStream output = new();
-        image.SaveAsJpeg(output, new() {
+        using MemoryStream jpegStream = new();
+        image.SaveAsJpeg(jpegStream, new() {
             Quality = 100,
             ColorType = JpegEncodingColor.YCbCrRatio444
         });
-        return output.ToArray();
+        return jpegStream.ToArray();
     }
 
-    internal static Byte[] GetJpeg(Stream stream, out Size size) {
-        using Image image = Image.Load(stream);
-        size = image.Size;
-        image.Metadata.ExifProfile = null;
-        using MemoryStream output = new();
-        image.SaveAsJpeg(output, new() {
-            Quality = 100,
-            ColorType = JpegEncodingColor.YCbCrRatio444
-        });
-        return output.ToArray();
+    internal static Byte[] GetJpeg(Stream input, bool imageAsIs, out Size size) {
+        if (!imageAsIs) {
+            using Image image = Image.Load(input);
+            size = image.Size;
+            image.Metadata.ExifProfile = null;
+            using MemoryStream jpegStream = new();
+            image.SaveAsJpeg(jpegStream, new() {
+                Quality = 100,
+                ColorType = JpegEncodingColor.YCbCrRatio444
+            });
+            return jpegStream.ToArray();
+        }
+        else {
+            using MemoryStream jpegStream = new();
+            input.CopyTo(jpegStream);
+            Byte[] jpeg = jpegStream.ToArray();
+            size = GetSize(jpeg);
+            return jpeg;
+        }
     }
 
     internal static Size GetSize(ReadOnlySpan<Byte> jpeg) {
-        return Image.Identify(jpeg).Size;
+        try {
+            return Image.Identify(new DecoderOptions {
+                Configuration = new(new JpegConfigurationModule())
+            }, jpeg).Size;
+        }
+        catch (UnknownImageFormatException exception) {
+            throw new Exception("Unsupported Image Format", exception);
+        }
     }
 }