Added image util class

SDFMapCreator/Program.cs

@@ -55,6 +55,53 @@ public static class ArrayExt {
     }
 }
 
+public static class ImageUtil {
+    public static T[,] LoadImage<T>(string path) where T : struct, IEquatable<T> {
+        var image = new MagickImage(path);
+        var pixels = image.GetPixels().ToArray();
+        if (pixels == null) throw new ("Failed to read image.");
+        
+        T[,] result = new T[image.Width, image.Height];
+        uint channels = image.ChannelCount;
+        
+        if(channels > 4) throw new NotSupportedException($"Image has {channels} channels, only 1-4 channels are supported.");
+        
+        switch (result) {
+            case float[,] f:
+                //remainder of index / channels must be 0
+                var data = pixels.Where((_, i) => i % channels != 0).ToArray();
+                for (int i = 0; i < image.Width * image.Height; i++) {
+                    int x = (int)(i % image.Width);
+                    int y = (int)(i / image.Width);
+                    result[x, y] = (T)(object)data[i];
+                }
+                break;
+            case Vector2[,]v2:
+                //can't read 1 channel images
+                if (channels < 2) throw new NotSupportedException($"Image has {channels} channels, only 2+ channels are supported.");
+                //remainder of index / channels must be 0 or 1 (2 values)
+                var data2 = pixels.Where((_, i) => i % channels >= 1).ToArray();
+                break;
+            case Vector3[,]v3:
+                //can't read <2 channel images
+                if(channels<3) throw new NotSupportedException($"Image has {channels} channels, only 3+ channels are supported.");
+                //remainder of index / channels must be 0, 1 or 2 (3 values)
+                var data3 = pixels.Where((_, i) => i % channels >= 2).ToArray();
+                break;
+            case Vector4[,]v4:
+                //can't read <3 channel images
+                if(channels<4) throw new NotSupportedException($"Image has {channels} channels, only 4+ channels are supported.");
+                //remainder of index / channels must be between 0 or 3 (4 values)
+                var data4 = pixels.Where((_, i) => i % channels >= 3).ToArray();
+                break;
+            default:
+                throw new NotSupportedException($"Type {typeof(T)} is not supported.");
+        }
+        
+        return result;
+    }
+}
+
 public class Program {
     private const float MAX = 65535f;
     private const float MIN = 0f;