about OMAPDDGPE::AllocSurface

Hi, we're using Wince BSP V01.00.00.

I don't understand some codes in the function OMAPDDGPE::AllocSurface, in the file "COMMON_TI_V1\COMMON_TI\DSS\DDGPE\omap_ddsurf.cpp", what does the code in red color use for? what if my screen resolution is 800x480?

//------------------------------------------------------------------------------
SCODE
OMAPDDGPE::AllocSurface(
                        OMAPDDGPESurface  ** ppSurf,
                        OMAP_DSS_PIXELFORMAT pixelFormat,
                        int                  width,
                        int                  height
                        )
{
    BOOL            bResult;
    OMAPSurface*    pOmapSurface;

    //  Allocate OMAP surface
    bResult = m_pSurfaceMgr->Allocate(
        pixelFormat,
        width,
        height,
        &pOmapSurface );
    if (bResult == FALSE)
    {
        DEBUGMSG(GPE_ZONE_WARNING, (L"OMAP DDraw AllocSurface - Out of Video Memory\n"));
        return DDERR_OUTOFVIDEOMEMORY;
    }
    if ((width == 720) && (height == 480))
    {
        m_lgSufAddress = pOmapSurface->PhysicalAddr();

        RETAILMSG(1, (L"OMAPDDGPE:AllocSurface:m_lgSufAddress = %x\r\n", m_lgSufAddress));
    }
    //  Allocate a OMAPDDGPESurface object to wrap the OMAP surface
    *ppSurf = new OMAPDDGPESurface(m_pSurfaceMgr, pOmapSurface);
    if (*ppSurf == NULL)
    {
        //  Out of system memory
        DEBUGMSG(GPE_ZONE_WARNING, (L"OMAP DDraw AllocSurface - Out of Memory\n"));
        delete pOmapSurface;
        return E_OUTOFMEMORY;
    }

    //  Surface created in video memory
    return S_OK;
} 

Regards,

Jack