Hi there!

Situation:
My application is scrolling an images on screen using DirectDraw ( IID_IDIRECTDRAW7 ). App developed using Delphi 2007.
With WinXP+DX9 my app works normally, as I wish.

Problem with Win7:
When I've try run my app on Win7(ultimate)+DX11 it was extremely slow down images scrolling . My hardware with WinXP & Win7 is the same.
What the problem with DirectDraw?

I need some solution of that problem very fast, because my app should be able work on both WinXP & Win7.

Problem experience:
1. Someone says that problem can be solved by update my app from DirectDraw to Direct3D. But it can takes indefinite time period & I'm not sure that it can realy solve my problem.
2. WinXp Mode takes no effect (my app even no scrolling & buzz in that mode).
3. Run my app with WinXP+SP2(3) compatibility takes no effect.


Thanks