ImageConfiguration configuration

The settings to pass to the decoration when painting, so that it can resolve images appropriately. See ImageProvider.resolve and BoxPainter.paint.

Source 

ImageConfiguration get configuration => _configuration;
void configuration=(ImageConfiguration newConfiguration)

Source 

set configuration (ImageConfiguration newConfiguration) {
  assert(newConfiguration != null);
  if (newConfiguration == _configuration)
    return;
  _configuration = newConfiguration;
  markNeedsPaint();
}