basic image export!

Program.cs

@@ -11,6 +11,7 @@ using SixLabors.ImageSharp.Metadata.Profiles.Exif;
 using SixLabors.ImageSharp.Metadata.Profiles.Xmp;
 using SixLabors.ImageSharp.Drawing.Processing;
 using SixLabors.ImageSharp.Drawing;
+using SixLabors.ImageSharp.Formats.Jpeg;
 using System;
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
@@ -220,6 +221,21 @@ public class Photo {
     }
   }
 
+  public void SaveAsJpeg(string outputRoot, JpegEncoder encoder) {
+    string directory = System.IO.Path.Combine(
+        outputRoot,
+        String.Format("{0:D4}", DateTimeOriginal.Year),
+        String.Format("{0:D2}", DateTimeOriginal.Month),
+        String.Format("{0:D2}", DateTimeOriginal.Day));
+    Directory.CreateDirectory(directory);
+    string filename = System.IO.Path.Combine(directory, System.IO.Path.GetFileName(Filename));
+    Console.WriteLine("saving " + filename);
+    // FIXME: update JPEG metadata.
+    using (Image<Rgba32> image = Image.Load<Rgba32>(Filename)) {
+      image.Save(filename, encoder);
+    }
+  }
+
   private bool TryParseRating(XmpProfile? xmp, out int rating) {
     rating = 0;
     if (xmp == null) {
@@ -651,6 +667,10 @@ public class Game : GameWindow {
       photoIndex -= 5;
     }
 
+    if (input.IsKeyPressed(Keys.X)) {
+      ExportPhotos();
+    }
+
     // Make sure the photoIndex is actually valid.
     if (photos.Count == 0) {
       photoIndex = 0;
@@ -781,10 +801,10 @@ public class Game : GameWindow {
 
     // Load photos from a directory.
     // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\photos-test\");
-    // string[] files = Directory.GetFiles(@"c:\users\colin\pictures\photos\2023\07\14\");
+    string[] files = Directory.GetFiles(@"c:\users\colin\pictures\photos\2023\07\14\");
     // string[] files = Directory.GetFiles(@"G:\DCIM\100EOSR6\");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Pictures\photos\2018\06\23");
-    string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\Germany all\104D7000");
+    // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\Germany all\104D7000");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\many-birds\");
 
     for (int i = 0; i < files.Count(); i++) {
@@ -846,8 +866,8 @@ public class Game : GameWindow {
       }
     }
     // Start loading any images that are in our window but not yet loaded.
-    int minLoadedImage = Math.Max(0, photoIndex - 20);
-    int maxLoadedImage = Math.Min(photoIndex + 20, photos.Count - 1);
+    int minLoadedImage = Math.Max(0, photoIndex - 30);
+    int maxLoadedImage = Math.Min(photoIndex + 30, photos.Count - 1);
     List<Photo> toLoad = new();
     for (int i = minLoadedImage; i <= maxLoadedImage; i++) {
       lock (loadedImagesLock) {
@@ -863,6 +883,16 @@ public class Game : GameWindow {
     }
   }
 
+  // To find the JPEG compression level of a file from the command line:
+  // $ identify -verbose image.jpg | grep Quality:
+  private void ExportPhotos() {
+    JpegEncoder encoder = new JpegEncoder() { Quality = 98 };
+    string outputRoot = @"c:\users\colin\desktop\totte-output";
+    foreach (Photo p in photos) {
+      p.SaveAsJpeg(outputRoot, encoder);
+    }
+  }
+
   protected override void OnRenderFrame(FrameEventArgs e) {
     base.OnRenderFrame(e);
     fpsCounter.Update();