Qt助手：
void QWidget::setMask ( const QBitmap & bitmap )
Causes only the pixels of the widget for which bitmap has a corresponding 1 bit to be visible. If the region includes pixels outside the rect() of the widget, window system controls in that area may or may not be visible, depending on the platform.
Note that this effect can be slow if the region is particularly complex.
The following code shows how an image with an alpha channel can be used to generate a mask for a widget:
QLabel topLevelLabel;
QPixmap pixmap(":/images/tux.png");
topLevelLabel.setPixmap(pixmap);
topLevelLabel.setMask(pixmap.mask());
The label shown by this code is masked using the image it contains, giving the appearance that an irregularly-shaped image is being drawn directly onto the screen.
Masked widgets receive mouse events only on their visible portions.
See also mask(), clearMask(), windowOpacity(), and Shaped Clock Example.
感觉不是个很难的东西吧……不过从来没测试过
paintEvent配合setAttribute(Qt::WA_TranslucentBackground, true)和setWindowFlags(Qt::FramelessWindowHint)（第二个windows下必须，其他不知）还可以实现窗口半透明效果呢，alpha为0的点似乎就是穿透效果
