Fix ImageCropper crash for small image

Author: shatyuka

CollapseLauncher/Classes/GameManagement/ImageBackground/ImageBackgroundManager.ImageCropperAndConvert.cs

@@ -98,6 +98,12 @@ public partial class ImageBackgroundManager
             ImageCropper cropper = UIElementExtensions
                .Create<ImageCropper>(SetImageCropperProperties);
 
+            // Skip spawning crop overlay when source dimensions do not meet minimum crop size.
+            if (!await CanOpenCropOverlay(backgroundImageUri, backgroundCodecType == ImageExternalCodecType.Svg, cropper, token))
+            {
+                return (overlayUrlOrPath, backgroundUrlOrPath, false);
+            }
+
             // -- Register to close dialog if cancellation is triggered outside the event.
             token.Register(dialog.Hide);
             if (token.IsCancellationRequested)
@@ -186,6 +192,22 @@ void SetImageCropperProperties(ImageCropper element)
         }
     }
 
+    private static async Task<bool> CanOpenCropOverlay(Uri imagePath, bool isSvg, ImageCropper cropper, CancellationToken token)
+    {
+        if (isSvg)
+        {
+            // SVG has no fixed source pixel size before rasterization, so keep existing behavior.
+            return true;
+        }
+
+        WriteableBitmap sourceBitmap = new(1, 1);
+        await using Stream sourceStream = await OpenStreamFromFileOrUrl(imagePath, token);
+        using IRandomAccessStream randomStream = sourceStream.AsRandomAccessStream(true);
+        await sourceBitmap.SetSourceAsync(randomStream);
+
+        return cropper.CanCropSource(sourceBitmap.PixelWidth, sourceBitmap.PixelHeight);
+    }
+
     /// <summary>
     /// Load the image to <see cref="ImageCropper"/> instance in asynchronous detached manner.
     /// </summary>

Hi3Helper.CommunityToolkit/ImageCropper/ImageCropper.Properties.cs

@@ -28,12 +28,24 @@ public partial class ImageCropper
     /// </summary>
     public Rect CroppedRegion => _currentCroppedRect;
 
+    /// <summary>
+    /// Checks whether the provided source pixel size can be cropped.
+    /// </summary>
+    /// <param name="pixelWidth">Source width in pixels.</param>
+    /// <param name="pixelHeight">Source height in pixels.</param>
+    /// <returns>True when the source meets the minimum crop size.</returns>
+    public bool CanCropSource(double pixelWidth, double pixelHeight)
+    {
+        var minCropSize = MinCropSize;
+        return pixelWidth >= minCropSize.Width && pixelHeight >= minCropSize.Height;
+    }
+
     private static void OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
     {
         var target = (ImageCropper)d;
         if (e.NewValue is BitmapSource bitmap)
         {
-            if (bitmap.PixelWidth < target.MinCropSize.Width || bitmap.PixelHeight < target.MinCropSize.Height)
+            if (!target.CanCropSource(bitmap.PixelWidth, bitmap.PixelHeight))
             {
                 target.Source = null;
                 throw new ArgumentException("The resolution of the image is too small!");