fix up GPS, sorta

Photo.cs

@@ -24,6 +24,8 @@ public class Photo {
   public string IsoSpeed = "<unk>";
   public int Rating = 0;
   public ushort Orientation = 1;
+  public Rational[]? GpsLatitude = null;
+  public Rational[]? GpsLongitude = null;
   public Rectangle CropRectangle = Rectangle.Empty;
 
   private static long touchCounter = 0;
@@ -110,6 +112,8 @@ public class Photo {
         "{0:D4}:{1:D2}:{2:D2} {3:D2}:{4:D2}:{5:D2}",
         now.Year, now.Month, now.Day, now.Hour, now.Minute, now.Second);
       exif.SetValue<string>(ExifTag.DateTime, datetime);
+      exif.SetValue<Rational[]>(ExifTag.GPSLatitude, GpsLatitude);
+      exif.SetValue<Rational[]>(ExifTag.GPSLongitude, GpsLongitude);
 
       image.Metadata.XmpProfile = UpdateXmp(image.Metadata.XmpProfile);
 
@@ -267,6 +271,16 @@ public class Photo {
         Console.WriteLine($"*** WARNING: unexpected DateTimeOriginal value: {dateTimeOriginal.Value}");
       }
     }
+
+    IExifValue<Rational[]>? gpsLatitude;
+    if (exifs.TryGetValue(ExifTag.GPSLatitude, out gpsLatitude)) {
+      GpsLatitude = gpsLatitude.Value;
+    }
+
+    IExifValue<Rational[]>? gpsLongitude;
+    if (exifs.TryGetValue(ExifTag.GPSLongitude, out gpsLongitude)) {
+      GpsLongitude = gpsLongitude.Value;
+    }
   }
 
   public string GetShortLensModel(string lensModel) {

Program.cs

@@ -684,10 +684,10 @@ public class Game : GameWindow {
                            false, 5 * sizeof(float), 3 * sizeof(float));
 
     // Load photos from a directory.
-    string[] files = Directory.GetFiles(@"c:\users\colin\desktop\photos-test\");
+    // 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\23\");
-    // string[] files = Directory.GetFiles(@"G:\DCIM\100EOSR6\");
+    string[] files = Directory.GetFiles(@"G:\DCIM\100EOSR6\");
     // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\totte-output\2023\07\31");
     // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\import");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Pictures\photos\2018\06\23");
@@ -703,6 +703,21 @@ public class Game : GameWindow {
     }
 
     allPhotos.Sort(ComparePhotosByDate);
+
+    // Fix up photos with missing GPS.
+    Rational[]? lastLatitude = null;
+    Rational[]? lastLongitude = null;
+    foreach (Photo p in allPhotos) {
+      if (p.GpsLatitude != null && p.GpsLongitude != null) {
+        lastLatitude = p.GpsLatitude;
+        lastLongitude = p.GpsLongitude;
+      }
+      if (p.GpsLatitude == null || p.GpsLongitude == null) {
+        Console.WriteLine("fixing GPS for " + p.Filename);
+        p.GpsLatitude = lastLatitude;
+        p.GpsLongitude = lastLongitude;
+      }
+    }
     photos = allPhotos;
 
     LoadThumbnailsAsync();
@@ -767,7 +782,7 @@ public class Game : GameWindow {
       }
     }
     foreach (Photo p in toLoad) {
-      await Task.Run( () => { p.LoadAsync(geometry.PhotoBox.Size); });
+      await Task.Run( () => { p.LoadAsync(p.Size); });
     }
   }