[Gtk-sharp-list] Scaling Gdk.Pixbuf in a thread

[blue_bob]

hi,

I'm writing an application that allows users to import picture and do some
basic editing like scaling, cropping or rotating. If the image is large the
processing of course takes a while during which the interface does not
respond. So I want to do the processing in a thread.

Right now I have the event callback function that starts a new thread with
the scaling process. When the scaling is done I call a function in my main
class again to draw the pixbuf onto an Gtk.DrawingArea.

I'm afraid my entire approch is wrong so if anyone can come up with a tip I
would be very grateful.

[code]
public class ScaleJob
{
	Gdk.Pixbuf pixbuf;
	double scale_x, scale_y;
	MainClass obj;
		
	public ScaleJob(Gdk.Pixbuf buf, double scalex,double scaley,
InsertDateTimeAddin _obj)
	{
		scale_x = scalex;
		scale_y = scaley;
		pixbuf = buf;
		obj = _obj;
	}
		
	public void Run()
	{
		pixbuf = pixbuf.ScaleSimple((int)(scale_x*(double)pixbuf.Width),
						(int)(scale_y*(double)pixbuf.Height),InterpType.Nearest);
		obj.ScaleJobCB(pixbuf);
	}
}

private void EventCallback(object source, System.EventArgs args)
{
	if(scale_running)
		return;
	scale_running = true;
	double sx = spin_scale_x.Value, sy = spin_scale_y.Value;//Scale X, Scale Y
values
	ScaleJob job = new ScaleJob(pixbuf, sx, sy, this);
	(new Thread(new ThreadStart(job.Run))).Start();
}
		
public void ScaleJobCB(Gdk.Pixbuf pix)
{
	Gdk.Threads.Enter();
	pixm.DrawPixbuf(image.Style.BlackGC, pix,
			0, 0, 0, 0, pix.Width, pix.Height,
			RgbDither.None, 0,0);
	Gdk.Threads.Leave();
	image.QueueDrawArea(0,0,600,400);//Image is the Gtk.DrawingArea
	scale_running = false;
}
[/code]		
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