sclass SimpleScanlineImage {
  // core value (mandatory): first row occupied
  int y1;
  
  // core value (mandatory): x coordinates per row
  // x_left is inclusive, x_right is exclusive
  //
  // Order in array:
  //   x_left at y1, x_right at y1,
  //   x_left at y1+1, x_right at y1+1, ,,,
  int[] data;

  // bounds can be calculated quickly from core values
  Rect bounds;
 
  // color is optional 
  Color color = Color.red;
}