help!how can i overlay the image to the texture

[nhsimon]

i build a 800*600 texture interface ,and load a 320*250 image(not 2^image stream ,video stream ,use directshow rendertotexture method) to the texture,than use draw2dimage(texture,position) to draw the image,but the image can't fix its size to the texture itself.if i use draw2dimage(texture,position,rect) to draw the image ,it can overlay the hold texture,but the quality is to bad.So,how can i draw the image into texture and made it fix the texture size just like the irr's skybox
By the way , i use Emil_halim's class to play video stream to the texture.see below
http://irrlicht.sourceforge.net/phpBB2/ ... ight=movie