renderPixmap

[zorro68]

Two days ago this code capture perfectly the opengl screen, but now capture a black rectangle:

void Visor::BTNcaptura_click()
{
    QSize size = getSize();
    if (size.isValid()) {
		//QPixmap pixmap = QPixmap::grabWidget(glWidget, 0,0, size.width(), size.height());  <-- this capture a green rectangle
		QPixmap pixmap = glWidget->renderPixmap(size.width(), size.height());  <-- this capture a black rectangle
		QString fileName = QFileDialog::getSaveFileName(this,tr("Guardar la imagen como..."),QString(),
				tr("Archivos de imágenes (*.png *.jpg *.bmp *.jpeg *.ppm *.xbm *.xpm);;Todos los Archivos (*)"));
		if (!fileName.isEmpty()){
         	QString filter=QFileInfo(fileName).suffix();
			if (filter=="jpg")
				pixmap.save(fileName,"jpg");	
                            ...
			else
				pixmap.save(fileName+".png","png");
		}
    }
}

void Visor::BTNcaptura_click()
{
    QSize size = getSize();
    if (size.isValid()) {
		//QPixmap pixmap = QPixmap::grabWidget(glWidget, 0,0, size.width(), size.height());  <-- this capture a green rectangle
		QPixmap pixmap = glWidget->renderPixmap(size.width(), size.height());  <-- this capture a black rectangle
		QString fileName = QFileDialog::getSaveFileName(this,tr("Guardar la imagen como..."),QString(),
				tr("Archivos de imágenes (*.png *.jpg *.bmp *.jpeg *.ppm *.xbm *.xpm);;Todos los Archivos (*)"));
		if (!fileName.isEmpty()){
         	QString filter=QFileInfo(fileName).suffix();
			if (filter=="jpg")
				pixmap.save(fileName,"jpg");	
                            ...
			else
				pixmap.save(fileName+".png","png");
		}
    }
}

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What happend?