如何拷贝一个QPixmap的一块内容到另外一个QPixmap？

[xxxyyyuuu]

QPixmap A;
把A上的一块QRect r区域的内容拷贝到QPixmap B上？
谢谢！

[MicroSky2813]

不知道使用qpaint画个行不，没试过……

[tingsking18]

QPixmap QPixmap::copy ( const QRect & rectangle = QRect() ) const
Returns a deep copy of the subset of the pixmap that is specified by the given rectangle. For more information on deep copies, see the Implicit Data Sharing documentation.
If the given rectangle is empty, the whole image is copied.

[xxxyyyuuu]

QPixmap *sbmp = new QPixmap(QPixmap::fromImage(sourceImage));
QPixmap cpybmp = sbmp->copy(0,0, 100, 100);

QPixmap drawbmp = QPixmap(QSize(100,100));
QPainter drawp(&drawbmp);
drawp.setCompositionMode(QPainter::RasterOp_SourceAndDestination);
drawp.drawPixmap(QPoint(0,0),cpybmp);

cpybmp = sbmp->copy(100,100, 100, 100);
drawp.drawPixmap(QPoint(0,0),cpybmp);

drawbmp.save("c:\\aaa.bmp");