bug fixes and performance improvements

Program.cs

@@ -77,7 +77,7 @@ public class ViewTool : ITool {
   }
 
   public string Status() {
-    return "view";
+    return "";
   }
 
   public void Draw(UiGeometry geometry, Game game) {
@@ -88,12 +88,19 @@ public class ViewTool : ITool {
 // FIXME: remove unneeded dependencies on "Game" or at least refactor them a bit.
 public class CropTool : ITool {
 
-  Photo? activePhoto;
+  Photo activePhoto;
   Vector2i mouseDragStart;
   Vector2i mouseDragEnd;
   string status = "";
 
+  public CropTool(Photo photo) {
+    activePhoto = photo;
+  }
+
   public void SetActivePhoto(Photo photo) {
+    if (photo != activePhoto) {
+      // FIXME: handle this sensibly.
+    }
     activePhoto = photo;
   }
 
@@ -139,6 +146,8 @@ public class CropTool : ITool {
     // in other direction work well.
     Vector2i start = mouseDragStart;
     Vector2i end = mouseDragEnd;
+    // FIXME: choose the aspect ratio based on the original image aspect ratio.
+    // FIXME: allow for unconstrained crop, 1:1, etc.
     end.Y = Math.Min(end.Y, start.Y + (end.X - start.X) * 4 / 6);
     end.X = start.X + (end.Y - start.Y) * 6 / 4;
     int left = Math.Min(start.X, end.X);
@@ -160,9 +169,7 @@ public class CropTool : ITool {
     Rectangle crop = Rectangle.FromLTRB(leftTop.X, leftTop.Y, rightBottom.X, rightBottom.Y);
     // FIXME: make sure this doesn't exceed image.Bounds.
     // FIXME: once set, display it properly in the PhotoBox.
-    if (activePhoto != null) {
-      activePhoto.CropRectangle = crop;
-    }
+    activePhoto.CropRectangle = crop;
     Console.WriteLine(crop);
   }
 
@@ -587,7 +594,7 @@ public static class Util {
     }
     // FIXME: I'm not convinced that all of these are correct, especially the
     // cases that involve flipping (because whether you're flipping before or
-    // after rotation matters.).
+    // after rotation matters.)
     var operations = new Dictionary<ushort, (RotateMode, FlipMode)> {
       { 2, (RotateMode.None, FlipMode.Horizontal) },
       { 3, (RotateMode.Rotate180, FlipMode.None) },
@@ -606,6 +613,11 @@ public static class Util {
   }
 
   public static Texture RenderText(string text, int size) {
+    // Make sure that 0-length text doesn't end up as a 0-size texture, which
+    // might cause problems.
+    if (text.Length == 0) {
+      text = " ";
+    }
     Font font = SystemFonts.CreateFont("Consolas", size, FontStyle.Bold);
     TextOptions options = new(font);
     FontRectangle rect = TextMeasurer.Measure(text, new TextOptions(font));
@@ -713,8 +725,6 @@ public class Game : GameWindow {
       Close();
     }
 
-    int lastPhotoIndex = photoIndex;
-
     mousePosition = (Vector2i) MouseState.Position;
 
     // Look for mouse clicks on thumbnails or stars.
@@ -786,10 +796,6 @@ public class Game : GameWindow {
       photoIndex = Math.Clamp(photoIndex, 0, photos.Count - 1);
     }
 
-    if (photoIndex != lastPhotoIndex) {
-      // FIXME!!!: do something to reset tool state here
-    }
-
     // Handle presses of the "rating" keys -- 0-5 and `.
     // A normal press just sets the rating of the current photo.
     // If the user is holding "shift", we instead filter to only show photos of that rating or higher.
@@ -856,7 +862,7 @@ public class Game : GameWindow {
     // Handle tool switching.
     if (activeTool == viewTool) {
       if (input.IsKeyPressed(Keys.C)) {
-        activeTool = new CropTool();
+        activeTool = new CropTool(photos[photoIndex]);
       }
     }