AnsweredAssumed Answered

DirectDraw CreateSurface size

Question asked by anders.an on Mar 13, 2012

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

Outcomes