QPainter QPixmap 抗锯齿

在paintEvent(QPaintEvent *)实现函数里绘制图片出现边缘锯齿解决办法：

pixmap.loadFromData(sealImage,sealImageLen);

pixmap = pixmap.scaled(w, h, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

painter.setRenderHints(QPainter::SmoothPixmapTransform);

painter.drawPixmap(0,i*(pageHeight+5),pageWidth,pageHeight,pix.transformed(matrix,Qt::SmoothTransformation));

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