DirectX rendering of native DLL graphics output

I have a native DLL that renders visuals, but it doesn't use hardware acceleration, and so can be very slow at high resolutions, and really slow at full screen.

In order to speed up this rendering when the user resizes the form, or goes full screen, I want to use DirectX to expand the graphics to fit the form.

So, essentially we will be rendering the graphics at a low resolution and using DirectX to expand it to fit a larger resolution.

The native DLL has a function that takes an? IDrectDrawSurface? object, so you should be able to retrieve the rendered graphics through that function, and then expand the graphics to fit the screen.

The graphics are meant to be rendered many times a second, so it will have to be fast.

I'll also need full screen capabilities programmed in.

It will also need to be compatible with as many systems as possible. I'm not worried about Windows 98, just 2000+. I would like this to be done in a backwards-compatible way that will work with as many video cards and configurations as possible.

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