how to implement video zoom out function on evm2 board?

Hi, all

I want to implement video zoom out function on evm2 board, and create a directdraw instance. when I getcaps of this object, I find that the dwMinOverlayStretch and dwMaxOverlayStretch are 1000 and 8000. So when the destination width is less than the source width, it returns invalid parameter error.

Does Omap33530 not support zoom out function?

To implement zoom out, how to do that?

Thank you!