Unified asset painter and added to package. Fixes and simplifes sprite rendering.

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

apps/wolf_3d_gui/lib/screens/sprite_gallery.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:wolf_3d_dart/wolf_3d_data_types.dart';
 import 'package:wolf_3d_dart/wolf_3d_entities.dart';
 import 'package:wolf_3d_flutter/wolf_3d.dart';
+import 'package:wolf_3d_renderer/wolf_3d_asset_painter.dart';
 
 class SpriteGallery extends StatelessWidget {
   final List<Sprite> sprites;
@@ -53,10 +54,7 @@ class SpriteGallery extends StatelessWidget {
                 textAlign: TextAlign.center,
               ),
               Expanded(
-                child: CustomPaint(
-                  painter: SingleSpritePainter(sprite: sprites[index]),
-                  size: const Size(64, 64),
-                ),
+                child: WolfAssetPainter.sprite(sprites[index]),
               ),
             ],
           );
@@ -65,28 +63,3 @@ class SpriteGallery extends StatelessWidget {
     );
   }
 }
-
-class SingleSpritePainter extends CustomPainter {
-  final Sprite sprite;
-  SingleSpritePainter({required this.sprite});
-
-  @override
-  void paint(Canvas canvas, Size size) {
-    double pixelSize = size.width / 64;
-    for (int x = 0; x < 64; x++) {
-      for (int y = 0; y < 64; y++) {
-        int colorByte = sprite.pixels[x * 64 + y];
-        if (colorByte != 255) {
-          // Skip transparency
-          canvas.drawRect(
-            Rect.fromLTWH(x * pixelSize, y * pixelSize, pixelSize, pixelSize),
-            Paint()..color = Color(ColorPalette.vga32Bit[colorByte]),
-          );
-        }
-      }
-    }
-  }
-
-  @override
-  bool shouldRepaint(CustomPainter oldDelegate) => false;
-}