Help With Clipping on the backbuffer in DirectDraw

Can I blt images to back buffer with negiative values in Rect type?

If i can not, How can i Increase the Primary and BackBuffer to be larger than the Window Handle or screen mode i'm connecting it too, and set the clipper as an offset in the buffers?

Thanks for any answers

You can't blit outside of the backbuffer's rectangle, making it larger is, afaik, not possible either. Just write your own little function to chop off parts of a Rect before you blit it. It's not that difficult...