示例

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#include <QPixmap>
#include <QPainter>
#include <QSize>
#include <QBitmap>
#include <QPainterPath>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    ui->label->setStyleSheet("background-color:transparent;"
                             "border: 1px solid rgba(0,0,0,1);"
                             "border-radius: 8px;");

    int w = ui->label->width() - 2;
    int h = ui->label->height() - 2;

    QPixmap pixmapback("://images/test.jpeg");
    QPixmap pixmap(w,h);
    pixmap.fill(Qt::transparent);
    QPainter painter(&pixmap);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
    QPainterPath path;
    path.addRoundedRect(0, 0, w, h,8,8);    //绘制圆角
    painter.setClipPath(path);
    painter.drawPixmap(0, 0, w, h, pixmapback);

    ui->label->setPixmap(pixmap);
}