BatchItem constructor
      
      BatchItem({ 
    
    
- required Rect source,
 - required RSTransform transform,
 - Color? color,
 - bool flip = false,
 
Implementation
BatchItem({
  required this.source,
  required this.transform,
  Color? color,
  this.flip = false,
}) : paint = Paint()..color = color ?? const Color(0x00000000),
     destination = Offset.zero & source.size;