问如何在Qt样式中平滑地降低背景图像的比例？

EN

pixmap = pixmap.scaledToHeight(height, Qt::SmoothTransformation);

ui->pushButton->setStyleSheet(
    "QPushButton { border-image: url(:/img/button.png) 0 0 0 0 stretch stretch; }"
    "QPushButton:checked { border-image: url(:/img/button_checked.png) 0 0 0 0 stretch stretch; }"
    "QPushButton:pressed { border-image: url(:/img/button_pressed.png) 0 0 0 0 stretch stretch; }"
    "QPushButton:checked:pressed { border-image: url(:/img/button_checked_pressed.png) 0 0 0 0 stretch stretch; }"
    );