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);
}