Improved weapon rendering

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/features/renderer/weapon_painter.dart

@@ -3,21 +3,38 @@ import 'package:wolf_dart/features/renderer/color_palette.dart';
 
 class WeaponPainter extends CustomPainter {
   final List<List<int>> sprite;
+
+  // 1. Initialize a reusable Paint object and disable anti-aliasing
+  // to keep the pixels perfectly sharp and chunky.
+  final Paint _paint = Paint()
+    ..isAntiAlias = false
+    ..style = PaintingStyle.fill;
+
   WeaponPainter({required this.sprite});
 
   @override
   void paint(Canvas canvas, Size size) {
-    double pixelSize = size.width / 64;
-    final paint = Paint();
+    // Calculate width and height separately in case the container isn't a perfect square
+    double pixelWidth = size.width / 64;
+    double pixelHeight = size.height / 64;
+
     for (int x = 0; x < 64; x++) {
       for (int y = 0; y < 64; y++) {
         int colorByte = sprite[x][y];
+
         if (colorByte != 255) {
-          // Transparency check
-          paint.color = ColorPalette.vga[colorByte];
+          // 255 is our transparent magenta
+          _paint.color = ColorPalette.vga[colorByte];
+
           canvas.drawRect(
-            Rect.fromLTWH(x * pixelSize, y * pixelSize, pixelSize, pixelSize),
-            paint,
+            Rect.fromLTWH(
+              x * pixelWidth,
+              y * pixelHeight,
+              pixelWidth +
+                  0.5, // 2. Add a tiny 0.5 overlap to completely eliminate visual seams
+              pixelHeight + 0.5,
+            ),
+            _paint,
           );
         }
       }
@@ -25,5 +42,9 @@ class WeaponPainter extends CustomPainter {
   }
 
   @override
-  bool shouldRepaint(covariant WeaponPainter oldDelegate) => true;
+  bool shouldRepaint(covariant WeaponPainter oldDelegate) {
+    // 3. ONLY repaint if the actual animation frame (sprite) has changed!
+    // This saves massive amounts of CPU when the player is just walking around.
+    return oldDelegate.sprite != sprite;
+  }
 }