Support TexturePacker image atlases

lib/runtime/rendering/runtime_component.dart

@@ -57,9 +57,7 @@ List<({Rect source, Rect destination})> runtimeNineSliceRects({
   final destLeft = left.clamp(0.0, destination.width).toDouble();
   final destTop = top.clamp(0.0, destination.height).toDouble();
   final destRight = right.clamp(0.0, destination.width - destLeft).toDouble();
-  final destBottom = bottom
-      .clamp(0.0, destination.height - destTop)
-      .toDouble();
+  final destBottom = bottom.clamp(0.0, destination.height - destTop).toDouble();
 
   final sourceXs = [
     source.left,
@@ -529,7 +527,7 @@ class RuntimeComponent extends PositionComponent
             _node.type == RuntimeNodeType.button)) {
       final imagePaint = Paint()
         ..color = composeRuntimeColorAlpha(Colors.white, renderAlpha);
-      final source = _imageSourceRect(image);
+      final source = _imageSourceRect(image, _currentImageFrame(_node));
       if (_usesNineSlice(source, rect)) {
         _drawNineSliceImage(canvas, image, source, rect, imagePaint);
       } else {
@@ -546,7 +544,13 @@ class RuntimeComponent extends PositionComponent
     );
   }
 
-  Rect _imageSourceRect(ui.Image image) {
+  Rect _imageSourceRect(ui.Image image, String? frameName) {
+    final frame = _loadedAsset == null
+        ? null
+        : _resources.textureFrame(_loadedAsset!, frameName);
+    if (frame != null) {
+      return frame.rect;
+    }
     return runtimeImageSourceRect(
       imageWidth: image.width.toDouble(),
       imageHeight: image.height.toDouble(),
@@ -666,6 +670,19 @@ class RuntimeComponent extends PositionComponent
     return node.asset;
   }
 
+  String? _currentImageFrame(RuntimeNode node) {
+    if (node.type != RuntimeNodeType.button) {
+      return node.frame;
+    }
+    if (!node.interactive && node.disabledFrame != null) {
+      return node.disabledFrame;
+    }
+    if (_pressed && node.pressedFrame != null) {
+      return node.pressedFrame;
+    }
+    return node.frame;
+  }
+
   void _releaseRetainedImage(String asset, int generation, ui.Image? image) {
     if (image == null) {
       return;