0 Replies Latest reply on Mar 13, 2012 9:39 PM by anders.an

    DirectDraw CreateSurface size

    anders.an

      Dear all,

       

      I'm developing a real time video player by DirectDraw.

      Here is a part of my code:

       

                DDSURFACEDESC2 sSurfaceDesc;

        ZeroMemory(&sSurfaceDesc, sizeof(DDSURFACEDESC2));

                sSurfaceDesc.dwSize         = sizeof(DDSURFACEDESC2);

        sSurfaceDesc.dwFlags        = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH;

        sSurfaceDesc.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;

        sSurfaceDesc.dwWidth  = iW;

                sSurfaceDesc.dwHeight = iH;

        HRESULT hRes = pDD->CreateSurface(&sSurfaceDesc, &lpBackSurface, NULL);

       

      On Radeon HD 6800 series, if iW is larger than the width of monitor resolution.

      I will get DDERR_INVALIDPARAMS from CreateSurface.

      EX.

           monitor resolution is 1440 x 900

           iW = 1600 iH = 1200 -> hRes = DDERR_INVALIDPARAMS

           iW = 1280 iH = 1024 -> hRes = DD_OK

       

      Since the display card is with DDCAPS2_WIDESURFACES in GetCaps.

      It supposes to be able to create a wider surface than the monitor.

      Any suggestions?

       

      Thank you for your help.

       

      Anders