QPixmap QPixmap::grabWindow(WId window, int x, int y, int w, int h)
{
QWidget *widget = QWidget::find(window);
if (!widget)
return QPixmap();
QRect grabRect = widget->frameGeometry();
if (!widget->isWindow())
grabRect.translate(widget->parentWidget()->mapToGlobal(QPoint()));
if (w < 0)
w = widget->width() - x;
if (h < 0)
h = widget->height() - y;
grabRect &= QRect(x, y, w, h).translated(widget->mapToGlobal(QPoint()));
QScreen *screen = qt_screen;
QDesktopWidget *desktop = QApplication::desktop();
if (!desktop)
return QPixmap();
if (desktop->numScreens() > 1) {
const int screenNo = desktop->screenNumber(widget);
if (screenNo != -1)
screen = qt_screen->subScreens().at(screenNo);
grabRect = grabRect.translated(-screen->region().boundingRect().topLeft());
}
if (screen->pixelFormat() == QImage::Format_Invalid) {
qWarning("QPixmap::grabWindow(): Unable to copy pixels from framebuffer");
return QPixmap();
}
if (screen->isTransformed()) {
const QSize screenSize(screen->width(), screen->height());
grabRect = screen->mapToDevice(grabRect, screenSize);
}
QWSDisplay::grab(false);
QPixmap pixmap;
QImage img(screen->base(),
screen->deviceWidth(), screen->deviceHeight(),
screen->linestep(), screen->pixelFormat());
img = img.copy(grabRect);
QWSDisplay::ungrab();
if (screen->isTransformed()) {
QMatrix matrix;
switch (screen->transformOrientation()) {
case 1: matrix.rotate(90); break;
case 2: matrix.rotate(180); break;
case 3: matrix.rotate(270); break;
default: break;
}
img = img.transformed(matrix);
}
if (screen->pixelType() == QScreen::BGRPixel)
img = img.rgbSwapped();
return QPixmap::fromImage(img);
}
/*!
Returns the length (in bytes) of each scanline of the framebuffer.
\sa frameBuffer()
*/
int QDirectPainter::linestep()
{
QScreen *screen = getPrimaryScreen();
if (!screen)
return 0;
return screen->linestep();
}