Loading a QPixmap from raw data

Hi,

For a computer vision class I'm writing a program to capture images from a webcam using opencv and then displaying it in a Qt GUI. The capture all works, and I copy the 3 channel OpenCV image to the 4 byte aligned format necessary for Qt in my capture thread (here's a fast implementation of that: http://www.qtcentre.org/forum/p-qima...ostcount7.html ). Then in my widget's paint event I have this:

Code:

---

void RenderWidget::paintEvent(QPaintEvent*) {
	QPainter painter(this);
	if(imageData) {
		QImage tImg(imageData, 640, 480, QImage::Format_RGB32);
		painter.drawImage(QPoint(0,0), tImg);
	}
	else {
		painter.setBrush(Qt::black);
		painter.drawRect(rect());
	}
}

---

This works fine and displays correctly, but I really don't like the fact that I'm creating a QImage only to then have it converted to a QPixmap for painting which wastes time (about 5-8% CPU time of a Athlon 64 3200 running at 1GHz)

QPixmap has a loadFromData function but it seems to expect an image encoded in PNG/GIF/JPG and won't take my raw 0xffRRGGBB data.
Is there any way to load a QPixmap from raw data like that or paint that data on screen in a more direct manner (OpenGL is not an option)?

You will always have to convert between image and pixmap, because image data is stored locally and pixmap data is stored on the X server.

By the way... as far as I know the conversion on Windows is almost transparent so you shouldn't have an overhead here.