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About DirectDraw

About DirectDraw

About DirectDraw

I want to create an images viewer.
I use DirectDraw for reason of compatibility with   Windows NT.
the problem is:
 when I post one image which is in the hidden surface on  the primary surface in a smaller frame the quality of image is losed.
The code that I use is:
 m_pDDPrimarysurface->Blt(&m_rect, m_pDDStoreSurface, NULL, DDBLT_WAIT, NULL);
 if you have a solution of my problem or you have a advice,help me please,it's very urgent.
 thank you in advance.

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