QT 等比例缩放显示RGB数据

根据视频数据的宽高，等比例显示在QT得label插件上，下面直接上代码：

void Show（QLabel *label,char *rgbData,int w,int h）

{

       QImage img(rgbData,w,h,QImage::Format_RGB888);

    QPixmap pixmap = QPixmap::fromImage(img);

    int labelwith = label->width();

    int labelheight = label->height();

    int newWidth = labelwith,newHeight = labelheight;

    if(labelwith >= labelheight)

    {

         newHeight = labelheight;

         newWidth  = newHeight * w/h;

    }

    if(labelwith < labelheight)

    {

        newWidth = labelwith;

        newHeight = newWidth * h/w;

    }

    QPixmap fitpixmap = pixmap.scaled(newWidth, newHeight, Qt::KeepAspectRatio, Qt::SmoothTransformation);

    label->setPixmap(fitpixmap);

    //label->setScaledContents(true);

    label->setAlignment(Qt::AlignCenter);

    label->show();

}