Optimise Image Sequence Importer

Addresses the issue at mlavik1#56

Assets/Scripts/Importing/ImageSequenceImporter.cs

@@ -30,9 +30,6 @@ namespace UnityVolumeRendering
 
             List<string> imagePaths = GetSortedImagePaths();
 
-            if (!ImageSetHasUniformDimensions(imagePaths))
-                throw new IndexOutOfRangeException("Image sequence has non-uniform dimensions");
-
             Vector3Int dimensions = GetVolumeDimensions(imagePaths);
             int[] data = FillSequentialData(dimensions, imagePaths);
             VolumeDataset dataset = FillVolumeDataset(data, dimensions);
@@ -60,34 +57,6 @@ namespace UnityVolumeRendering
             return imagePaths;
         }
 
-        /// <summary>
-        /// Checks if every image in the set has the same XY dimensions.
-        /// </summary>
-        /// <param name="imagePaths">The list of image paths to check.</param>
-        /// <returns>True if at least one image differs from another.</returns>
-        private bool ImageSetHasUniformDimensions(List<string> imagePaths)
-        {
-            bool hasUniformDimension = true;
-
-            Vector2Int previous, current;
-            previous = GetImageDimensions(imagePaths[0]);
-
-            foreach (var path in imagePaths)
-            {
-                current = GetImageDimensions(path);
-
-                if (current.x != previous.x || current.y != previous.y)
-                {
-                    hasUniformDimension = false;
-                    break;
-                }
-
-                previous = current;
-            }
-
-            return hasUniformDimension;
-        }
-
         /// <summary>
         /// Gets the XY dimensions of an image at the path.
         /// </summary>
@@ -142,6 +111,12 @@ namespace UnityVolumeRendering
                 byte[] bytes = File.ReadAllBytes(path);
                 texture.LoadImage(bytes);
 
+                if (texture.width != dimensions.x || texture.height != dimensions.y)
+                {
+                    Texture2D.DestroyImmediate(texture);
+                    throw new IndexOutOfRangeException("Image sequence has non-uniform dimensions");
+                }
+
                 Color[] pixels = texture.GetPixels(); // Order priority: X -> Y -> Z
                 int[] imageData = DensityHelper.ConvertColorsToDensities(pixels);
 
@@ -177,4 +152,4 @@ namespace UnityVolumeRendering
             return dataset;
         }
     }
-}
+}