Qt5加载SVG格式的图片并更颜色

QIcon MainWindow::qiconFromSvg(QString svg_path, QString color)
{
  QPixmap img(svg_path);
  QPainter qp(&img);
  qp.setCompositionMode(QPainter::CompositionMode_SourceIn);
  qp.fillRect( img.rect(), QColor(color) );
  qp.end();
  return QIcon(img);
}