sprite helper classes

tanks-backend/TanksServer/Graphics/Sprite.cs

@@ -0,0 +1,27 @@
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.PixelFormats;
+
+namespace TanksServer.Graphics;
+
+internal sealed class Sprite(bool?[,] data)
+{
+    public static Sprite FromImageFile(string filePath)
+    {
+        using var image = Image.Load<Rgba32>(filePath);
+        var data = new bool?[image.Width, image.Height];
+
+        var whitePixel = new Rgba32(byte.MaxValue, byte.MaxValue, byte.MaxValue, byte.MaxValue);
+        for (var y = 0; y < image.Height; y++)
+        for (var x = 0; x < image.Width; x++)
+        {
+            var pixelValue = image[x, y];
+            data[x, y] = pixelValue.A == 0
+                ? null
+                : pixelValue == whitePixel;
+        }
+
+        return new Sprite(data);
+    }
+
+    public bool? this[int x, int y] => data[x, y];
+}